/* Process declarations and variables for C compiler.
Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002 Free Software Foundation, Inc.
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* Process declarations and symbol lookup for C front end.
Also constructs types; the standard scalar types at initialization,
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "input.h"
+#include "tm.h"
#include "intl.h"
#include "tree.h"
#include "tree-inline.h"
#include "output.h"
#include "expr.h"
#include "c-tree.h"
-#include "c-lex.h"
#include "toplev.h"
#include "ggc.h"
#include "tm_p.h"
#include "cpplib.h"
#include "target.h"
#include "debug.h"
+#include "opts.h"
#include "timevar.h"
#include "c-common.h"
#include "c-pragma.h"
+#include "langhooks.h"
+#include "tree-mudflap.h"
+#include "gimple.h"
+#include "tree-iterator.h"
+#include "diagnostic.h"
+#include "tree-dump.h"
+#include "cgraph.h"
+#include "hashtab.h"
+#include "libfuncs.h"
+#include "except.h"
+#include "langhooks-def.h"
+#include "pointer-set.h"
+#include "gimple.h"
/* In grokdeclarator, distinguish syntactic contexts of declarators. */
enum decl_context
FUNCDEF, /* Function definition */
PARM, /* Declaration of parm before function body */
FIELD, /* Declaration inside struct or union */
- BITFIELD, /* Likewise but with specified width */
TYPENAME}; /* Typename (inside cast or sizeof) */
+/* States indicating how grokdeclarator() should handle declspecs marked
+ with __attribute__((deprecated)). An object declared as
+ __attribute__((deprecated)) suppresses warnings of uses of other
+ deprecated items. */
+
+enum deprecated_states {
+ DEPRECATED_NORMAL,
+ DEPRECATED_SUPPRESS
+};
+
\f
/* Nonzero if we have seen an invalid cross reference
to a struct, union, or enum, but not yet printed the message. */
-
tree pending_invalid_xref;
-/* File and line to appear in the eventual error message. */
-const char *pending_invalid_xref_file;
-int pending_invalid_xref_line;
-/* While defining an enum type, this is 1 plus the last enumerator
- constant value. Note that will do not have to save this or `enum_overflow'
- around nested function definition since such a definition could only
- occur in an enum value expression and we don't use these variables in
- that case. */
-
-static tree enum_next_value;
+/* File and line to appear in the eventual error message. */
+location_t pending_invalid_xref_location;
-/* Nonzero means that there was overflow computing enum_next_value. */
+/* True means we've initialized exception handling. */
+bool c_eh_initialized_p;
-static int enum_overflow;
+/* The file and line that the prototype came from if this is an
+ old-style definition; used for diagnostics in
+ store_parm_decls_oldstyle. */
-/* Parsing a function declarator leaves a list of parameter names
- or a chain or parameter decls here. */
+static location_t current_function_prototype_locus;
-static tree last_function_parms;
+/* Whether this prototype was built-in. */
-/* Parsing a function declarator leaves here a chain of structure
- and enum types declared in the parmlist. */
+static bool current_function_prototype_built_in;
-static tree last_function_parm_tags;
+/* The argument type information of this prototype. */
-/* After parsing the declarator that starts a function definition,
- `start_function' puts here the list of parameter names or chain of decls.
- `store_parm_decls' finds it here. */
+static tree current_function_prototype_arg_types;
-static tree current_function_parms;
+/* The argument information structure for the function currently being
+ defined. */
-/* Similar, for last_function_parm_tags. */
-static tree current_function_parm_tags;
+static struct c_arg_info *current_function_arg_info;
-/* Similar, for the file and line that the prototype came from if this is
- an old-style definition. */
-static const char *current_function_prototype_file;
-static int current_function_prototype_line;
+/* The obstack on which parser and related data structures, which are
+ not live beyond their top-level declaration or definition, are
+ allocated. */
+struct obstack parser_obstack;
/* The current statement tree. */
-static struct stmt_tree_s c_stmt_tree;
-
-/* The current scope statement stack. */
-
-static tree c_scope_stmt_stack;
+static GTY(()) struct stmt_tree_s c_stmt_tree;
-/* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
- that have names. Here so we can clear out their names' definitions
- at the end of the function. */
+/* State saving variables. */
+tree c_break_label;
+tree c_cont_label;
-static tree named_labels;
+/* Linked list of TRANSLATION_UNIT_DECLS for the translation units
+ included in this invocation. Note that the current translation
+ unit is not included in this list. */
-/* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
+static GTY(()) tree all_translation_units;
-static tree shadowed_labels;
-
-/* Nonzero when store_parm_decls is called indicates a varargs function.
- Value not meaningful after store_parm_decls. */
-
-static int c_function_varargs;
+/* A list of decls to be made automatically visible in each file scope. */
+static GTY(()) tree visible_builtins;
/* Set to 0 at beginning of a function definition, set to 1 if
a return statement that specifies a return value is seen. */
static int warn_about_return_type;
-/* Nonzero when starting a function declared `extern inline'. */
-
-static int current_extern_inline;
-\f
-/* For each binding contour we allocate a binding_level structure
- * which records the names defined in that contour.
- * Contours include:
- * 0) the global one
- * 1) one for each function definition,
- * where internal declarations of the parameters appear.
- * 2) one for each compound statement,
- * to record its declarations.
- *
- * The current meaning of a name can be found by searching the levels from
- * the current one out to the global one.
- */
-
-/* Note that the information in the `names' component of the global contour
- is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
-
-struct binding_level
- {
- /* A chain of _DECL nodes for all variables, constants, functions,
- and typedef types. These are in the reverse of the order supplied.
- */
- tree names;
-
- /* A list of structure, union and enum definitions,
- * for looking up tag names.
- * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
- * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
- * or ENUMERAL_TYPE node.
- */
- tree tags;
-
- /* For each level, a list of shadowed outer-level local definitions
- to be restored when this level is popped.
- Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
- whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
- tree shadowed;
-
- /* For each level (except not the global one),
- a chain of BLOCK nodes for all the levels
- that were entered and exited one level down. */
- tree blocks;
-
- /* The BLOCK node for this level, if one has been preallocated.
- If 0, the BLOCK is allocated (if needed) when the level is popped. */
- tree this_block;
-
- /* The binding level which this one is contained in (inherits from). */
- struct binding_level *level_chain;
-
- /* Nonzero for the level that holds the parameters of a function. */
- char parm_flag;
-
- /* Nonzero if this level "doesn't exist" for tags. */
- char tag_transparent;
-
- /* Nonzero if sublevels of this level "don't exist" for tags.
- This is set in the parm level of a function definition
- while reading the function body, so that the outermost block
- of the function body will be tag-transparent. */
- char subblocks_tag_transparent;
-
- /* Nonzero means make a BLOCK for this level regardless of all else. */
- char keep;
-
- /* Nonzero means make a BLOCK if this level has any subblocks. */
- char keep_if_subblocks;
-
- /* Number of decls in `names' that have incomplete
- structure or union types. */
- int n_incomplete;
+/* Nonzero when the current toplevel function contains a declaration
+ of a nested function which is never defined. */
- /* A list of decls giving the (reversed) specified order of parms,
- not including any forward-decls in the parmlist.
- This is so we can put the parms in proper order for assign_parms. */
- tree parm_order;
- };
+static bool undef_nested_function;
-#define NULL_BINDING_LEVEL (struct binding_level *) NULL
+/* True means global_bindings_p should return false even if the scope stack
+ says we are in file scope. */
+bool c_override_global_bindings_to_false;
-/* The binding level currently in effect. */
-
-static struct binding_level *current_binding_level;
-
-/* A chain of binding_level structures awaiting reuse. */
-
-static struct binding_level *free_binding_level;
-
-/* The outermost binding level, for names of file scope.
- This is created when the compiler is started and exists
- through the entire run. */
-
-static struct binding_level *global_binding_level;
-
-/* Binding level structures are initialized by copying this one. */
-
-static struct binding_level clear_binding_level
- = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
- NULL};
-
-/* Nonzero means unconditionally make a BLOCK for the next level pushed. */
-
-static int keep_next_level_flag;
-
-/* Nonzero means make a BLOCK for the next level pushed
- if it has subblocks. */
-
-static int keep_next_if_subblocks;
-
-/* The chain of outer levels of label scopes.
- This uses the same data structure used for binding levels,
- but it works differently: each link in the chain records
- saved values of named_labels and shadowed_labels for
- a label binding level outside the current one. */
-
-static struct binding_level *label_level_chain;
-
-/* Functions called automatically at the beginning and end of execution. */
-
-tree static_ctors, static_dtors;
-
-/* Forward declarations. */
-
-static struct binding_level * make_binding_level PARAMS ((void));
-static void mark_binding_level PARAMS ((void *));
-static void clear_limbo_values PARAMS ((tree));
-static int duplicate_decls PARAMS ((tree, tree, int));
-static int redeclaration_error_message PARAMS ((tree, tree));
-static void storedecls PARAMS ((tree));
-static void storetags PARAMS ((tree));
-static tree lookup_tag PARAMS ((enum tree_code, tree,
- struct binding_level *, int));
-static tree lookup_tag_reverse PARAMS ((tree));
-static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
- int));
-static tree grokparms PARAMS ((tree, int));
-static void layout_array_type PARAMS ((tree));
-static tree c_make_fname_decl PARAMS ((tree, int));
-static void c_expand_body PARAMS ((tree, int, int));
-static void warn_if_shadowing PARAMS ((tree, tree));
\f
-/* C-specific option variables. */
-
-/* Nonzero means allow type mismatches in conditional expressions;
- just make their values `void'. */
-
-int flag_cond_mismatch;
-
-/* Nonzero means don't recognize the keyword `asm'. */
-
-int flag_no_asm;
-
-/* Nonzero means do some things the same way PCC does. */
-
-int flag_traditional;
-
-/* Nonzero means enable C89 Amendment 1 features. */
-
-int flag_isoc94 = 0;
-
-/* Nonzero means use the ISO C99 dialect of C. */
+/* Each c_binding structure describes one binding of an identifier to
+ a decl. All the decls in a scope - irrespective of namespace - are
+ chained together by the ->prev field, which (as the name implies)
+ runs in reverse order. All the decls in a given namespace bound to
+ a given identifier are chained by the ->shadowed field, which runs
+ from inner to outer scopes.
+
+ The ->decl field usually points to a DECL node, but there are two
+ exceptions. In the namespace of type tags, the bound entity is a
+ RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
+ identifier is encountered, it is bound to error_mark_node to
+ suppress further errors about that identifier in the current
+ function.
+
+ The ->type field stores the type of the declaration in this scope;
+ if NULL, the type is the type of the ->decl field. This is only of
+ relevance for objects with external or internal linkage which may
+ be redeclared in inner scopes, forming composite types that only
+ persist for the duration of those scopes. In the external scope,
+ this stores the composite of all the types declared for this
+ object, visible or not. The ->inner_comp field (used only at file
+ scope) stores whether an incomplete array type at file scope was
+ completed at an inner scope to an array size other than 1.
+
+ The depth field is copied from the scope structure that holds this
+ decl. It is used to preserve the proper ordering of the ->shadowed
+ field (see bind()) and also for a handful of special-case checks.
+ Finally, the invisible bit is true for a decl which should be
+ ignored for purposes of normal name lookup, and the nested bit is
+ true for a decl that's been bound a second time in an inner scope;
+ in all such cases, the binding in the outer scope will have its
+ invisible bit true. */
+
+struct c_binding GTY((chain_next ("%h.prev")))
+{
+ tree decl; /* the decl bound */
+ tree type; /* the type in this scope */
+ tree id; /* the identifier it's bound to */
+ struct c_binding *prev; /* the previous decl in this scope */
+ struct c_binding *shadowed; /* the innermost decl shadowed by this one */
+ unsigned int depth : 28; /* depth of this scope */
+ BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
+ BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
+ BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
+ /* one free bit */
+};
+#define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
+#define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
+#define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
+#define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
+
+#define I_SYMBOL_BINDING(node) \
+ (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
+#define I_SYMBOL_DECL(node) \
+ (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
+
+#define I_TAG_BINDING(node) \
+ (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
+#define I_TAG_DECL(node) \
+ (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
+
+#define I_LABEL_BINDING(node) \
+ (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
+#define I_LABEL_DECL(node) \
+ (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
+
+/* Each C symbol points to three linked lists of c_binding structures.
+ These describe the values of the identifier in the three different
+ namespaces defined by the language. */
+
+struct lang_identifier GTY(())
+{
+ struct c_common_identifier common_id;
+ struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
+ struct c_binding *tag_binding; /* struct/union/enum tags */
+ struct c_binding *label_binding; /* labels */
+};
-int flag_isoc99 = 0;
+/* Validate c-lang.c's assumptions. */
+extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
+[(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
-/* Nonzero means that we have builtin functions, and main is an int */
+/* The resulting tree type. */
-int flag_hosted = 1;
+union lang_tree_node
+ GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
+ chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))")))
+{
+ union tree_node GTY ((tag ("0"),
+ desc ("tree_node_structure (&%h)")))
+ generic;
+ struct lang_identifier GTY ((tag ("1"))) identifier;
+};
-/* Nonzero means add default format_arg attributes for functions not
- in ISO C. */
+/* Each c_scope structure describes the complete contents of one
+ scope. Four scopes are distinguished specially: the innermost or
+ current scope, the innermost function scope, the file scope (always
+ the second to outermost) and the outermost or external scope.
-int flag_noniso_default_format_attributes = 1;
+ Most declarations are recorded in the current scope.
-/* Nonzero means to allow single precision math even if we're generally
- being traditional. */
-int flag_allow_single_precision = 0;
+ All normal label declarations are recorded in the innermost
+ function scope, as are bindings of undeclared identifiers to
+ error_mark_node. (GCC permits nested functions as an extension,
+ hence the 'innermost' qualifier.) Explicitly declared labels
+ (using the __label__ extension) appear in the current scope.
-/* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
+ Being in the file scope (current_scope == file_scope) causes
+ special behavior in several places below. Also, under some
+ conditions the Objective-C front end records declarations in the
+ file scope even though that isn't the current scope.
-int flag_signed_bitfields = 1;
-int explicit_flag_signed_bitfields = 0;
+ All declarations with external linkage are recorded in the external
+ scope, even if they aren't visible there; this models the fact that
+ such declarations are visible to the entire program, and (with a
+ bit of cleverness, see pushdecl) allows diagnosis of some violations
+ of C99 6.2.2p7 and 6.2.7p2:
-/* Nonzero means warn about use of implicit int. */
+ If, within the same translation unit, the same identifier appears
+ with both internal and external linkage, the behavior is
+ undefined.
-int warn_implicit_int;
+ All declarations that refer to the same object or function shall
+ have compatible type; otherwise, the behavior is undefined.
-/* Nonzero means warn about usage of long long when `-pedantic'. */
+ Initially only the built-in declarations, which describe compiler
+ intrinsic functions plus a subset of the standard library, are in
+ this scope.
-int warn_long_long = 1;
+ The order of the blocks list matters, and it is frequently appended
+ to. To avoid having to walk all the way to the end of the list on
+ each insertion, or reverse the list later, we maintain a pointer to
+ the last list entry. (FIXME: It should be feasible to use a reversed
+ list here.)
-/* Nonzero means message about use of implicit function declarations;
- 1 means warning; 2 means error. */
+ The bindings list is strictly in reverse order of declarations;
+ pop_scope relies on this. */
-int mesg_implicit_function_declaration = -1;
-/* Nonzero means give string constants the type `const char *'
- to get extra warnings from them. These warnings will be too numerous
- to be useful, except in thoroughly ANSIfied programs. */
+struct c_scope GTY((chain_next ("%h.outer")))
+{
+ /* The scope containing this one. */
+ struct c_scope *outer;
-int flag_const_strings;
+ /* The next outermost function scope. */
+ struct c_scope *outer_function;
-/* Nonzero means warn about pointer casts that can drop a type qualifier
- from the pointer target type. */
+ /* All bindings in this scope. */
+ struct c_binding *bindings;
-int warn_cast_qual;
+ /* For each scope (except the global one), a chain of BLOCK nodes
+ for all the scopes that were entered and exited one level down. */
+ tree blocks;
+ tree blocks_last;
-/* Nonzero means warn when casting a function call to a type that does
- not match the return type (e.g. (float)sqrt() or (anything*)malloc()
- when there is no previous declaration of sqrt or malloc. */
+ /* The depth of this scope. Used to keep the ->shadowed chain of
+ bindings sorted innermost to outermost. */
+ unsigned int depth : 28;
-int warn_bad_function_cast;
+ /* True if we are currently filling this scope with parameter
+ declarations. */
+ BOOL_BITFIELD parm_flag : 1;
-/* Warn about functions which might be candidates for format attributes. */
+ /* True if we saw [*] in this scope. Used to give an error messages
+ if these appears in a function definition. */
+ BOOL_BITFIELD had_vla_unspec : 1;
-int warn_missing_format_attribute;
+ /* True if we already complained about forward parameter decls
+ in this scope. This prevents double warnings on
+ foo (int a; int b; ...) */
+ BOOL_BITFIELD warned_forward_parm_decls : 1;
-/* Warn about traditional constructs whose meanings changed in ANSI C. */
+ /* True if this is the outermost block scope of a function body.
+ This scope contains the parameters, the local variables declared
+ in the outermost block, and all the labels (except those in
+ nested functions, or declared at block scope with __label__). */
+ BOOL_BITFIELD function_body : 1;
-int warn_traditional;
+ /* True means make a BLOCK for this scope no matter what. */
+ BOOL_BITFIELD keep : 1;
+};
-/* Nonzero means warn about sizeof(function) or addition/subtraction
- of function pointers. */
+/* The scope currently in effect. */
-int warn_pointer_arith;
+static GTY(()) struct c_scope *current_scope;
-/* Nonzero means warn for non-prototype function decls
- or non-prototyped defs without previous prototype. */
+/* The innermost function scope. Ordinary (not explicitly declared)
+ labels, bindings to error_mark_node, and the lazily-created
+ bindings of __func__ and its friends get this scope. */
-int warn_strict_prototypes;
+static GTY(()) struct c_scope *current_function_scope;
-/* Nonzero means warn for any global function def
- without separate previous prototype decl. */
+/* The C file scope. This is reset for each input translation unit. */
-int warn_missing_prototypes;
+static GTY(()) struct c_scope *file_scope;
-/* Nonzero means warn for any global function def
- without separate previous decl. */
+/* The outermost scope. This is used for all declarations with
+ external linkage, and only these, hence the name. */
-int warn_missing_declarations;
+static GTY(()) struct c_scope *external_scope;
-/* Nonzero means warn about multiple (redundant) decls for the same single
- variable or function. */
+/* A chain of c_scope structures awaiting reuse. */
-int warn_redundant_decls = 0;
+static GTY((deletable)) struct c_scope *scope_freelist;
-/* Nonzero means warn about extern declarations of objects not at
- file-scope level and about *all* declarations of functions (whether
- extern or static) not at file-scope level. Note that we exclude
- implicit function declarations. To get warnings about those, use
- -Wimplicit. */
+/* A chain of c_binding structures awaiting reuse. */
-int warn_nested_externs = 0;
+static GTY((deletable)) struct c_binding *binding_freelist;
-/* Warn about a subscript that has type char. */
+/* Append VAR to LIST in scope SCOPE. */
+#define SCOPE_LIST_APPEND(scope, list, decl) do { \
+ struct c_scope *s_ = (scope); \
+ tree d_ = (decl); \
+ if (s_->list##_last) \
+ BLOCK_CHAIN (s_->list##_last) = d_; \
+ else \
+ s_->list = d_; \
+ s_->list##_last = d_; \
+} while (0)
-int warn_char_subscripts = 0;
+/* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
+#define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
+ struct c_scope *t_ = (tscope); \
+ struct c_scope *f_ = (fscope); \
+ if (t_->to##_last) \
+ BLOCK_CHAIN (t_->to##_last) = f_->from; \
+ else \
+ t_->to = f_->from; \
+ t_->to##_last = f_->from##_last; \
+} while (0)
-/* Warn if a type conversion is done that might have confusing results. */
+/* True means unconditionally make a BLOCK for the next scope pushed. */
-int warn_conversion;
+static bool keep_next_level_flag;
-/* Warn if adding () is suggested. */
+/* True means the next call to push_scope will be the outermost scope
+ of a function body, so do not push a new scope, merely cease
+ expecting parameter decls. */
-int warn_parentheses;
+static bool next_is_function_body;
-/* Warn if initializer is not completely bracketed. */
+/* Forward declarations. */
+static tree lookup_name_in_scope (tree, struct c_scope *);
+static tree c_make_fname_decl (tree, int);
+static tree grokdeclarator (const struct c_declarator *,
+ struct c_declspecs *,
+ enum decl_context, bool, tree *, tree *,
+ enum deprecated_states);
+static tree grokparms (struct c_arg_info *, bool);
+static void layout_array_type (tree);
+\f
+/* T is a statement. Add it to the statement-tree. This is the
+ C/ObjC version--C++ has a slightly different version of this
+ function. */
-int warn_missing_braces;
+tree
+add_stmt (tree t)
+{
+ enum tree_code code = TREE_CODE (t);
-/* Warn if main is suspicious. */
+ if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
+ {
+ if (!EXPR_HAS_LOCATION (t))
+ SET_EXPR_LOCATION (t, input_location);
+ }
-int warn_main;
+ if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
+ STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
-/* Warn about #pragma directives that are not recognised. */
+ /* Add T to the statement-tree. Non-side-effect statements need to be
+ recorded during statement expressions. */
+ append_to_statement_list_force (t, &cur_stmt_list);
-int warn_unknown_pragmas = 0; /* Tri state variable. */
+ return t;
+}
+\f
-/* Warn about comparison of signed and unsigned values.
- If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
+void
+c_print_identifier (FILE *file, tree node, int indent)
+{
+ print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
+ print_node (file, "tag", I_TAG_DECL (node), indent + 4);
+ print_node (file, "label", I_LABEL_DECL (node), indent + 4);
+ if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
+ {
+ tree rid = ridpointers[C_RID_CODE (node)];
+ indent_to (file, indent + 4);
+ fprintf (file, "rid %p \"%s\"",
+ (void *) rid, IDENTIFIER_POINTER (rid));
+ }
+}
-int warn_sign_compare = -1;
+/* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
+ which may be any of several kinds of DECL or TYPE or error_mark_node,
+ in the scope SCOPE. */
+static void
+bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
+{
+ struct c_binding *b, **here;
-/* Warn about testing equality of floating point numbers. */
+ if (binding_freelist)
+ {
+ b = binding_freelist;
+ binding_freelist = b->prev;
+ }
+ else
+ b = GGC_NEW (struct c_binding);
-int warn_float_equal = 0;
+ b->shadowed = 0;
+ b->decl = decl;
+ b->id = name;
+ b->depth = scope->depth;
+ b->invisible = invisible;
+ b->nested = nested;
+ b->inner_comp = 0;
-/* Nonzero means warn about use of multicharacter literals. */
+ b->type = 0;
-int warn_multichar = 1;
+ b->prev = scope->bindings;
+ scope->bindings = b;
-/* Nonzero means `$' can be in an identifier. */
+ if (!name)
+ return;
-#ifndef DOLLARS_IN_IDENTIFIERS
-#define DOLLARS_IN_IDENTIFIERS 1
-#endif
-int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
+ switch (TREE_CODE (decl))
+ {
+ case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
+ case ENUMERAL_TYPE:
+ case UNION_TYPE:
+ case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
+ case VAR_DECL:
+ case FUNCTION_DECL:
+ case TYPE_DECL:
+ case CONST_DECL:
+ case PARM_DECL:
+ case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
-/* States indicating how grokdeclarator() should handle declspecs marked
- with __attribute__((deprecated)). An object declared as
- __attribute__((deprecated)) suppresses warnings of uses of other
- deprecated items. */
-
-enum deprecated_states {
- DEPRECATED_NORMAL,
- DEPRECATED_SUPPRESS
-};
+ default:
+ gcc_unreachable ();
+ }
-static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
+ /* Locate the appropriate place in the chain of shadowed decls
+ to insert this binding. Normally, scope == current_scope and
+ this does nothing. */
+ while (*here && (*here)->depth > scope->depth)
+ here = &(*here)->shadowed;
-/* Decode the string P as a language-specific option for C.
- Return the number of strings consumed. Should not complain
- if it does not recognise the option. */
+ b->shadowed = *here;
+ *here = b;
+}
-int
-c_decode_option (argc, argv)
- int argc ATTRIBUTE_UNUSED;
- char **argv;
+/* Clear the binding structure B, stick it on the binding_freelist,
+ and return the former value of b->prev. This is used by pop_scope
+ and get_parm_info to iterate destructively over all the bindings
+ from a given scope. */
+static struct c_binding *
+free_binding_and_advance (struct c_binding *b)
{
- int strings_processed;
- char *p = argv[0];
-
- strings_processed = cpp_handle_option (parse_in, argc, argv, 0);
-
- if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
- {
- warning ("-traditional is deprecated and may be removed");
- flag_traditional = 1;
- flag_writable_strings = 1;
- }
- else if (!strcmp (p, "-fallow-single-precision"))
- flag_allow_single_precision = 1;
- else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
- {
- flag_hosted = 1;
- flag_no_builtin = 0;
- }
- else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
- {
- flag_hosted = 0;
- flag_no_builtin = 1;
- /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
- if (warn_main == 2)
- warn_main = 0;
- }
- else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
- {
- flag_traditional = 0;
- flag_writable_strings = 0;
- }
- else if (!strncmp (p, "-std=", 5))
- {
- /* Select the appropriate language standard. We currently
- recognize:
- -std=iso9899:1990 same as -ansi
- -std=iso9899:199409 ISO C as modified in amend. 1
- -std=iso9899:1999 ISO C 99
- -std=c89 same as -std=iso9899:1990
- -std=c99 same as -std=iso9899:1999
- -std=gnu89 default, iso9899:1990 + gnu extensions
- -std=gnu99 iso9899:1999 + gnu extensions
- */
- const char *const argstart = &p[5];
+ struct c_binding *prev = b->prev;
- if (!strcmp (argstart, "iso9899:1990")
- || !strcmp (argstart, "c89"))
- {
- iso_1990:
- flag_isoc94 = 0;
- iso_1994:
- flag_traditional = 0;
- flag_writable_strings = 0;
- flag_no_asm = 1;
- flag_no_nonansi_builtin = 1;
- flag_noniso_default_format_attributes = 0;
- flag_isoc99 = 0;
- }
- else if (!strcmp (argstart, "iso9899:199409"))
- {
- flag_isoc94 = 1;
- goto iso_1994;
- }
- else if (!strcmp (argstart, "iso9899:199x")
- || !strcmp (argstart, "iso9899:1999")
- || !strcmp (argstart, "c9x")
- || !strcmp (argstart, "c99"))
- {
- flag_traditional = 0;
- flag_writable_strings = 0;
- flag_no_asm = 1;
- flag_no_nonansi_builtin = 1;
- flag_noniso_default_format_attributes = 0;
- flag_isoc99 = 1;
- flag_isoc94 = 1;
- }
- else if (!strcmp (argstart, "gnu89"))
- {
- flag_traditional = 0;
- flag_writable_strings = 0;
- flag_no_asm = 0;
- flag_no_nonansi_builtin = 0;
- flag_noniso_default_format_attributes = 1;
- flag_isoc99 = 0;
- flag_isoc94 = 0;
- }
- else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
- {
- flag_traditional = 0;
- flag_writable_strings = 0;
- flag_no_asm = 0;
- flag_no_nonansi_builtin = 0;
- flag_noniso_default_format_attributes = 1;
- flag_isoc99 = 1;
- flag_isoc94 = 1;
- }
- else
- error ("unknown C standard `%s'", argstart);
- }
- else if (!strcmp (p, "-fdollars-in-identifiers"))
- dollars_in_ident = 1;
- else if (!strcmp (p, "-fno-dollars-in-identifiers"))
- dollars_in_ident = 0;
- else if (!strcmp (p, "-fsigned-char"))
- flag_signed_char = 1;
- else if (!strcmp (p, "-funsigned-char"))
- flag_signed_char = 0;
- else if (!strcmp (p, "-fno-signed-char"))
- flag_signed_char = 0;
- else if (!strcmp (p, "-fno-unsigned-char"))
- flag_signed_char = 1;
- else if (!strcmp (p, "-fsigned-bitfields")
- || !strcmp (p, "-fno-unsigned-bitfields"))
- {
- flag_signed_bitfields = 1;
- explicit_flag_signed_bitfields = 1;
- }
- else if (!strcmp (p, "-funsigned-bitfields")
- || !strcmp (p, "-fno-signed-bitfields"))
- {
- flag_signed_bitfields = 0;
- explicit_flag_signed_bitfields = 1;
- }
- else if (!strcmp (p, "-fshort-enums"))
- flag_short_enums = 1;
- else if (!strcmp (p, "-fno-short-enums"))
- flag_short_enums = 0;
- else if (!strcmp (p, "-fshort-wchar"))
- flag_short_wchar = 1;
- else if (!strcmp (p, "-fno-short-wchar"))
- flag_short_wchar = 0;
- else if (!strcmp (p, "-fcond-mismatch"))
- flag_cond_mismatch = 1;
- else if (!strcmp (p, "-fno-cond-mismatch"))
- flag_cond_mismatch = 0;
- else if (!strcmp (p, "-fshort-double"))
- flag_short_double = 1;
- else if (!strcmp (p, "-fno-short-double"))
- flag_short_double = 0;
- else if (!strcmp (p, "-fasm"))
- flag_no_asm = 0;
- else if (!strcmp (p, "-fno-asm"))
- flag_no_asm = 1;
- else if (!strcmp (p, "-fbuiltin"))
- flag_no_builtin = 0;
- else if (!strcmp (p, "-fno-builtin"))
- flag_no_builtin = 1;
- else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
- disable_builtin_function (p + strlen ("-fno-builtin-"));
- else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
- ;
- else if (!strcmp (p, "-ansi"))
- goto iso_1990;
- else if (!strcmp (p, "-Werror-implicit-function-declaration"))
- mesg_implicit_function_declaration = 2;
- else if (!strcmp (p, "-Wimplicit-function-declaration"))
- mesg_implicit_function_declaration = 1;
- else if (!strcmp (p, "-Wno-implicit-function-declaration"))
- mesg_implicit_function_declaration = 0;
- else if (!strcmp (p, "-Wimplicit-int"))
- warn_implicit_int = 1;
- else if (!strcmp (p, "-Wno-implicit-int"))
- warn_implicit_int = 0;
- else if (!strcmp (p, "-Wimplicit"))
- {
- warn_implicit_int = 1;
- if (mesg_implicit_function_declaration != 2)
- mesg_implicit_function_declaration = 1;
- }
- else if (!strcmp (p, "-Wno-implicit"))
- warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
- else if (!strcmp (p, "-Wlong-long"))
- warn_long_long = 1;
- else if (!strcmp (p, "-Wno-long-long"))
- warn_long_long = 0;
- else if (!strcmp (p, "-Wwrite-strings"))
- flag_const_strings = 1;
- else if (!strcmp (p, "-Wno-write-strings"))
- flag_const_strings = 0;
- else if (!strcmp (p, "-Wcast-qual"))
- warn_cast_qual = 1;
- else if (!strcmp (p, "-Wno-cast-qual"))
- warn_cast_qual = 0;
- else if (!strcmp (p, "-Wbad-function-cast"))
- warn_bad_function_cast = 1;
- else if (!strcmp (p, "-Wno-bad-function-cast"))
- warn_bad_function_cast = 0;
- else if (!strcmp (p, "-Wno-missing-noreturn"))
- warn_missing_noreturn = 0;
- else if (!strcmp (p, "-Wmissing-format-attribute"))
- warn_missing_format_attribute = 1;
- else if (!strcmp (p, "-Wno-missing-format-attribute"))
- warn_missing_format_attribute = 0;
- else if (!strcmp (p, "-Wpointer-arith"))
- warn_pointer_arith = 1;
- else if (!strcmp (p, "-Wno-pointer-arith"))
- warn_pointer_arith = 0;
- else if (!strcmp (p, "-Wstrict-prototypes"))
- warn_strict_prototypes = 1;
- else if (!strcmp (p, "-Wno-strict-prototypes"))
- warn_strict_prototypes = 0;
- else if (!strcmp (p, "-Wmissing-prototypes"))
- warn_missing_prototypes = 1;
- else if (!strcmp (p, "-Wno-missing-prototypes"))
- warn_missing_prototypes = 0;
- else if (!strcmp (p, "-Wmissing-declarations"))
- warn_missing_declarations = 1;
- else if (!strcmp (p, "-Wno-missing-declarations"))
- warn_missing_declarations = 0;
- else if (!strcmp (p, "-Wredundant-decls"))
- warn_redundant_decls = 1;
- else if (!strcmp (p, "-Wno-redundant-decls"))
- warn_redundant_decls = 0;
- else if (!strcmp (p, "-Wnested-externs"))
- warn_nested_externs = 1;
- else if (!strcmp (p, "-Wno-nested-externs"))
- warn_nested_externs = 0;
- else if (!strcmp (p, "-Wtraditional"))
- warn_traditional = 1;
- else if (!strcmp (p, "-Wno-traditional"))
- warn_traditional = 0;
- else if (!strncmp (p, "-Wformat=", 9))
- set_Wformat (atoi (p + 9));
- else if (!strcmp (p, "-Wformat"))
- set_Wformat (1);
- else if (!strcmp (p, "-Wno-format"))
- set_Wformat (0);
- else if (!strcmp (p, "-Wformat-y2k"))
- warn_format_y2k = 1;
- else if (!strcmp (p, "-Wno-format-y2k"))
- warn_format_y2k = 0;
- else if (!strcmp (p, "-Wformat-extra-args"))
- warn_format_extra_args = 1;
- else if (!strcmp (p, "-Wno-format-extra-args"))
- warn_format_extra_args = 0;
- else if (!strcmp (p, "-Wformat-nonliteral"))
- warn_format_nonliteral = 1;
- else if (!strcmp (p, "-Wno-format-nonliteral"))
- warn_format_nonliteral = 0;
- else if (!strcmp (p, "-Wformat-security"))
- warn_format_security = 1;
- else if (!strcmp (p, "-Wno-format-security"))
- warn_format_security = 0;
- else if (!strcmp (p, "-Wchar-subscripts"))
- warn_char_subscripts = 1;
- else if (!strcmp (p, "-Wno-char-subscripts"))
- warn_char_subscripts = 0;
- else if (!strcmp (p, "-Wconversion"))
- warn_conversion = 1;
- else if (!strcmp (p, "-Wno-conversion"))
- warn_conversion = 0;
- else if (!strcmp (p, "-Wparentheses"))
- warn_parentheses = 1;
- else if (!strcmp (p, "-Wno-parentheses"))
- warn_parentheses = 0;
- else if (!strcmp (p, "-Wreturn-type"))
- warn_return_type = 1;
- else if (!strcmp (p, "-Wno-return-type"))
- warn_return_type = 0;
- else if (!strcmp (p, "-Wsequence-point"))
- warn_sequence_point = 1;
- else if (!strcmp (p, "-Wno-sequence-point"))
- warn_sequence_point = 0;
- else if (!strcmp (p, "-Wcomment"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wno-comment"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wcomments"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wno-comments"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wtrigraphs"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wno-trigraphs"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wundef"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wno-undef"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wimport"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wno-import"))
- ; /* cpp handles this one. */
- else if (!strcmp (p, "-Wmissing-braces"))
- warn_missing_braces = 1;
- else if (!strcmp (p, "-Wno-missing-braces"))
- warn_missing_braces = 0;
- else if (!strcmp (p, "-Wmain"))
- warn_main = 1;
- else if (!strcmp (p, "-Wno-main"))
- warn_main = -1;
- else if (!strcmp (p, "-Wsign-compare"))
- warn_sign_compare = 1;
- else if (!strcmp (p, "-Wno-sign-compare"))
- warn_sign_compare = 0;
- else if (!strcmp (p, "-Wfloat-equal"))
- warn_float_equal = 1;
- else if (!strcmp (p, "-Wno-float-equal"))
- warn_float_equal = 0;
- else if (!strcmp (p, "-Wmultichar"))
- warn_multichar = 1;
- else if (!strcmp (p, "-Wno-multichar"))
- warn_multichar = 0;
- else if (!strcmp (p, "-Wdiv-by-zero"))
- warn_div_by_zero = 1;
- else if (!strcmp (p, "-Wno-div-by-zero"))
- warn_div_by_zero = 0;
- else if (!strcmp (p, "-Wunknown-pragmas"))
- /* Set to greater than 1, so that even unknown pragmas in system
- headers will be warned about. */
- warn_unknown_pragmas = 2;
- else if (!strcmp (p, "-Wno-unknown-pragmas"))
- warn_unknown_pragmas = 0;
- else if (!strcmp (p, "-Wall"))
- {
- /* We save the value of warn_uninitialized, since if they put
- -Wuninitialized on the command line, we need to generate a
- warning about not using it without also specifying -O. */
- if (warn_uninitialized != 1)
- warn_uninitialized = 2;
- warn_implicit_int = 1;
- mesg_implicit_function_declaration = 1;
- warn_return_type = 1;
- set_Wunused (1);
- warn_switch = 1;
- set_Wformat (1);
- warn_char_subscripts = 1;
- warn_parentheses = 1;
- warn_sequence_point = 1;
- warn_missing_braces = 1;
- /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
- it off only if it's not explicit. */
- warn_main = 2;
- /* Only warn about unknown pragmas that are not in system headers. */
- warn_unknown_pragmas = 1;
- }
- else
- return strings_processed;
+ memset (b, 0, sizeof (struct c_binding));
+ b->prev = binding_freelist;
+ binding_freelist = b;
- return 1;
+ return prev;
}
-void
-c_print_identifier (file, node, indent)
- FILE *file;
- tree node;
- int indent;
-{
- print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
- print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
- print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
- print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
- print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
- print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
- if (C_IS_RESERVED_WORD (node))
- {
- tree rid = ridpointers[C_RID_CODE (node)];
- indent_to (file, indent + 4);
- fprintf (file, "rid ");
- fprintf (file, HOST_PTR_PRINTF, (void *)rid);
- fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
- }
-}
\f
/* Hook called at end of compilation to assume 1 elt
- for a top-level tentative array defn that wasn't complete before. */
+ for a file-scope tentative array defn that wasn't complete before. */
void
-finish_incomplete_decl (decl)
- tree decl;
+c_finish_incomplete_decl (tree decl)
{
if (TREE_CODE (decl) == VAR_DECL)
{
tree type = TREE_TYPE (decl);
if (type != error_mark_node
&& TREE_CODE (type) == ARRAY_TYPE
- && ! DECL_EXTERNAL (decl)
+ && !DECL_EXTERNAL (decl)
&& TYPE_DOMAIN (type) == 0)
{
- warning_with_decl (decl, "array `%s' assumed to have one element");
+ warning (0, "array %q+D assumed to have one element", decl);
- complete_array_type (type, NULL_TREE, 1);
+ complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
layout_decl (decl, 0);
}
}
}
\f
-/* Create a new `struct binding_level'. */
+/* The Objective-C front-end often needs to determine the current scope. */
-static struct binding_level *
-make_binding_level ()
+void *
+objc_get_current_scope (void)
{
- /* NOSTRICT */
- return (struct binding_level *) xmalloc (sizeof (struct binding_level));
+ return current_scope;
}
-/* Nonzero if we are currently in the global binding level. */
-
-int
-global_bindings_p ()
-{
- return current_binding_level == global_binding_level;
-}
+/* The following function is used only by Objective-C. It needs to live here
+ because it accesses the innards of c_scope. */
void
-keep_next_level ()
+objc_mark_locals_volatile (void *enclosing_blk)
{
- keep_next_level_flag = 1;
+ struct c_scope *scope;
+ struct c_binding *b;
+
+ for (scope = current_scope;
+ scope && scope != enclosing_blk;
+ scope = scope->outer)
+ {
+ for (b = scope->bindings; b; b = b->prev)
+ objc_volatilize_decl (b->decl);
+
+ /* Do not climb up past the current function. */
+ if (scope->function_body)
+ break;
+ }
}
-/* Nonzero if the current level needs to have a BLOCK made. */
+/* Nonzero if we are currently in file scope. */
int
-kept_level_p ()
+global_bindings_p (void)
{
- return ((current_binding_level->keep_if_subblocks
- && current_binding_level->blocks != 0)
- || current_binding_level->keep
- || current_binding_level->names != 0
- || (current_binding_level->tags != 0
- && !current_binding_level->tag_transparent));
+ return current_scope == file_scope && !c_override_global_bindings_to_false;
}
-/* Identify this binding level as a level of parameters.
- DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
- But it turns out there is no way to pass the right value for
- DEFINITION_FLAG, so we ignore it. */
-
void
-declare_parm_level (definition_flag)
- int definition_flag ATTRIBUTE_UNUSED;
+keep_next_level (void)
{
- current_binding_level->parm_flag = 1;
+ keep_next_level_flag = true;
}
-/* Nonzero if currently making parm declarations. */
+/* Identify this scope as currently being filled with parameters. */
-int
-in_parm_level_p ()
+void
+declare_parm_level (void)
{
- return current_binding_level->parm_flag;
+ current_scope->parm_flag = true;
}
-/* Enter a new binding level.
- If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
- not for that of tags. */
-
void
-pushlevel (tag_transparent)
- int tag_transparent;
+push_scope (void)
{
- struct binding_level *newlevel = NULL_BINDING_LEVEL;
-
- /* If this is the top level of a function,
- just make sure that NAMED_LABELS is 0. */
-
- if (current_binding_level == global_binding_level)
- {
- named_labels = 0;
- }
-
- /* Reuse or create a struct for this binding level. */
-
- if (free_binding_level)
- {
- newlevel = free_binding_level;
- free_binding_level = free_binding_level->level_chain;
+ if (next_is_function_body)
+ {
+ /* This is the transition from the parameters to the top level
+ of the function body. These are the same scope
+ (C99 6.2.1p4,6) so we do not push another scope structure.
+ next_is_function_body is set only by store_parm_decls, which
+ in turn is called when and only when we are about to
+ encounter the opening curly brace for the function body.
+
+ The outermost block of a function always gets a BLOCK node,
+ because the debugging output routines expect that each
+ function has at least one BLOCK. */
+ current_scope->parm_flag = false;
+ current_scope->function_body = true;
+ current_scope->keep = true;
+ current_scope->outer_function = current_function_scope;
+ current_function_scope = current_scope;
+
+ keep_next_level_flag = false;
+ next_is_function_body = false;
}
else
{
- newlevel = make_binding_level ();
- }
+ struct c_scope *scope;
+ if (scope_freelist)
+ {
+ scope = scope_freelist;
+ scope_freelist = scope->outer;
+ }
+ else
+ scope = GGC_CNEW (struct c_scope);
- /* Add this level to the front of the chain (stack) of levels that
- are active. */
+ scope->keep = keep_next_level_flag;
+ scope->outer = current_scope;
+ scope->depth = current_scope ? (current_scope->depth + 1) : 0;
- *newlevel = clear_binding_level;
- newlevel->tag_transparent
- = (tag_transparent
- || (current_binding_level
- ? current_binding_level->subblocks_tag_transparent
- : 0));
- newlevel->level_chain = current_binding_level;
- current_binding_level = newlevel;
- newlevel->keep = keep_next_level_flag;
- keep_next_level_flag = 0;
- newlevel->keep_if_subblocks = keep_next_if_subblocks;
- keep_next_if_subblocks = 0;
+ /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
+ possible. */
+ if (current_scope && scope->depth == 0)
+ {
+ scope->depth--;
+ sorry ("GCC supports only %u nested scopes", scope->depth);
+ }
+
+ current_scope = scope;
+ keep_next_level_flag = false;
+ }
}
-/* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
+/* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
static void
-clear_limbo_values (block)
- tree block;
+set_type_context (tree type, tree context)
{
- tree tem;
-
- for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
- if (DECL_NAME (tem) != 0)
- IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
-
- for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
- clear_limbo_values (tem);
+ for (type = TYPE_MAIN_VARIANT (type); type;
+ type = TYPE_NEXT_VARIANT (type))
+ TYPE_CONTEXT (type) = context;
}
-/* Exit a binding level.
- Pop the level off, and restore the state of the identifier-decl mappings
- that were in effect when this level was entered.
-
- If KEEP is nonzero, this level had explicit declarations, so
- and create a "block" (a BLOCK node) for the level
- to record its declarations and subblocks for symbol table output.
-
- If FUNCTIONBODY is nonzero, this level is the body of a function,
- so create a block as if KEEP were set and also clear out all
- label names.
-
- If REVERSE is nonzero, reverse the order of decls before putting
- them into the BLOCK. */
+/* Exit a scope. Restore the state of the identifier-decl mappings
+ that were in effect when this scope was entered. Return a BLOCK
+ node containing all the DECLs in this scope that are of interest
+ to debug info generation. */
tree
-poplevel (keep, reverse, functionbody)
- int keep;
- int reverse;
- int functionbody;
+pop_scope (void)
{
- tree link;
- /* The chain of decls was accumulated in reverse order.
- Put it into forward order, just for cleanliness. */
- tree decls;
- tree tags = current_binding_level->tags;
- tree subblocks = current_binding_level->blocks;
- tree block = 0;
- tree decl;
- int block_previously_created;
-
- keep |= current_binding_level->keep;
-
- /* This warning is turned off because it causes warnings for
- declarations like `extern struct foo *x'. */
-#if 0
- /* Warn about incomplete structure types in this level. */
- for (link = tags; link; link = TREE_CHAIN (link))
- if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
- {
- tree type = TREE_VALUE (link);
- tree type_name = TYPE_NAME (type);
- char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
- ? type_name
- : DECL_NAME (type_name));
- switch (TREE_CODE (type))
- {
- case RECORD_TYPE:
- error ("`struct %s' incomplete in scope ending here", id);
- break;
- case UNION_TYPE:
- error ("`union %s' incomplete in scope ending here", id);
- break;
- case ENUMERAL_TYPE:
- error ("`enum %s' incomplete in scope ending here", id);
- break;
- }
- }
-#endif /* 0 */
-
- /* Get the decls in the order they were written.
- Usually current_binding_level->names is in reverse order.
- But parameter decls were previously put in forward order. */
-
- if (reverse)
- current_binding_level->names
- = decls = nreverse (current_binding_level->names);
- else
- decls = current_binding_level->names;
-
- /* Output any nested inline functions within this block
- if they weren't already output. */
+ struct c_scope *scope = current_scope;
+ tree block, context, p;
+ struct c_binding *b;
- for (decl = decls; decl; decl = TREE_CHAIN (decl))
- if (TREE_CODE (decl) == FUNCTION_DECL
- && ! TREE_ASM_WRITTEN (decl)
- && DECL_INITIAL (decl) != 0
- && TREE_ADDRESSABLE (decl))
- {
- /* If this decl was copied from a file-scope decl
- on account of a block-scope extern decl,
- propagate TREE_ADDRESSABLE to the file-scope decl.
-
- DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
- true, since then the decl goes through save_for_inline_copying. */
- if (DECL_ABSTRACT_ORIGIN (decl) != 0
- && DECL_ABSTRACT_ORIGIN (decl) != decl)
- TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
- }
+ bool functionbody = scope->function_body;
+ bool keep = functionbody || scope->keep || scope->bindings;
- /* We used to warn about unused variables in expand_end_bindings,
- i.e. while generating RTL. But in function-at-a-time mode we may
- choose to never expand a function at all (e.g. auto inlining), so
- we do this explicitly now. */
- warn_about_unused_variables (getdecls ());
-
- /* If there were any declarations or structure tags in that level,
- or if this level is a function body,
- create a BLOCK to record them for the life of this function. */
+ c_end_vm_scope (scope->depth);
+ /* If appropriate, create a BLOCK to record the decls for the life
+ of this function. */
block = 0;
- block_previously_created = (current_binding_level->this_block != 0);
- if (block_previously_created)
- block = current_binding_level->this_block;
- else if (keep || functionbody
- || (current_binding_level->keep_if_subblocks && subblocks != 0))
- block = make_node (BLOCK);
- if (block != 0)
+ if (keep)
{
- BLOCK_VARS (block) = decls;
- BLOCK_SUBBLOCKS (block) = subblocks;
- }
+ block = make_node (BLOCK);
+ BLOCK_SUBBLOCKS (block) = scope->blocks;
+ TREE_USED (block) = 1;
- /* In each subblock, record that this is its superior. */
+ /* In each subblock, record that this is its superior. */
+ for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
+ BLOCK_SUPERCONTEXT (p) = block;
- for (link = subblocks; link; link = TREE_CHAIN (link))
- BLOCK_SUPERCONTEXT (link) = block;
+ BLOCK_VARS (block) = 0;
+ }
- /* Clear out the meanings of the local variables of this level. */
+ /* The TYPE_CONTEXTs for all of the tagged types belonging to this
+ scope must be set so that they point to the appropriate
+ construct, i.e. either to the current FUNCTION_DECL node, or
+ else to the BLOCK node we just constructed.
+
+ Note that for tagged types whose scope is just the formal
+ parameter list for some function type specification, we can't
+ properly set their TYPE_CONTEXTs here, because we don't have a
+ pointer to the appropriate FUNCTION_TYPE node readily available
+ to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
+ type nodes get set in `grokdeclarator' as soon as we have created
+ the FUNCTION_TYPE node which will represent the "scope" for these
+ "parameter list local" tagged types. */
+ if (scope->function_body)
+ context = current_function_decl;
+ else if (scope == file_scope)
+ {
+ tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
+ TREE_CHAIN (file_decl) = all_translation_units;
+ all_translation_units = file_decl;
+ context = file_decl;
+ }
+ else
+ context = block;
- for (link = decls; link; link = TREE_CHAIN (link))
+ /* Clear all bindings in this scope. */
+ for (b = scope->bindings; b; b = free_binding_and_advance (b))
{
- if (DECL_NAME (link) != 0)
+ p = b->decl;
+ switch (TREE_CODE (p))
{
- /* If the ident. was used or addressed via a local extern decl,
- don't forget that fact. */
- if (DECL_EXTERNAL (link))
+ case LABEL_DECL:
+ /* Warnings for unused labels, errors for undefined labels. */
+ if (TREE_USED (p) && !DECL_INITIAL (p))
{
- if (TREE_USED (link))
- TREE_USED (DECL_NAME (link)) = 1;
- if (TREE_ADDRESSABLE (link))
- TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
+ error ("label %q+D used but not defined", p);
+ DECL_INITIAL (p) = error_mark_node;
}
- IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
- }
- }
-
- /* Restore all name-meanings of the outer levels
- that were shadowed by this level. */
+ else
+ warn_for_unused_label (p);
+
+ /* Labels go in BLOCK_VARS. */
+ TREE_CHAIN (p) = BLOCK_VARS (block);
+ BLOCK_VARS (block) = p;
+ gcc_assert (I_LABEL_BINDING (b->id) == b);
+ I_LABEL_BINDING (b->id) = b->shadowed;
+ break;
- for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
- IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
+ case ENUMERAL_TYPE:
+ case UNION_TYPE:
+ case RECORD_TYPE:
+ set_type_context (p, context);
- /* If the level being exited is the top level of a function,
- check over all the labels, and clear out the current
- (function local) meanings of their names. */
+ /* Types may not have tag-names, in which case the type
+ appears in the bindings list with b->id NULL. */
+ if (b->id)
+ {
+ gcc_assert (I_TAG_BINDING (b->id) == b);
+ I_TAG_BINDING (b->id) = b->shadowed;
+ }
+ break;
- if (functionbody)
- {
- clear_limbo_values (block);
+ case FUNCTION_DECL:
+ /* Propagate TREE_ADDRESSABLE from nested functions to their
+ containing functions. */
+ if (!TREE_ASM_WRITTEN (p)
+ && DECL_INITIAL (p) != 0
+ && TREE_ADDRESSABLE (p)
+ && DECL_ABSTRACT_ORIGIN (p) != 0
+ && DECL_ABSTRACT_ORIGIN (p) != p)
+ TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
+ if (!DECL_EXTERNAL (p)
+ && !DECL_INITIAL (p)
+ && scope != file_scope
+ && scope != external_scope)
+ {
+ error ("nested function %q+D declared but never defined", p);
+ undef_nested_function = true;
+ }
+ else if (DECL_DECLARED_INLINE_P (p)
+ && TREE_PUBLIC (p)
+ && !DECL_INITIAL (p))
+ {
+ /* C99 6.7.4p6: "a function with external linkage... declared
+ with an inline function specifier ... shall also be defined
+ in the same translation unit." */
+ if (!flag_gnu89_inline)
+ pedwarn (input_location, 0,
+ "inline function %q+D declared but never defined", p);
+ DECL_EXTERNAL (p) = 1;
+ }
- /* If this is the top level block of a function,
- the vars are the function's parameters.
- Don't leave them in the BLOCK because they are
- found in the FUNCTION_DECL instead. */
+ goto common_symbol;
- BLOCK_VARS (block) = 0;
+ case VAR_DECL:
+ /* Warnings for unused variables. */
+ if (!TREE_USED (p)
+ && !TREE_NO_WARNING (p)
+ && !DECL_IN_SYSTEM_HEADER (p)
+ && DECL_NAME (p)
+ && !DECL_ARTIFICIAL (p)
+ && scope != file_scope
+ && scope != external_scope)
+ warning (OPT_Wunused_variable, "unused variable %q+D", p);
- /* Clear out the definitions of all label names,
- since their scopes end here,
- and add them to BLOCK_VARS. */
+ if (b->inner_comp)
+ {
+ error ("type of array %q+D completed incompatibly with"
+ " implicit initialization", p);
+ }
- for (link = named_labels; link; link = TREE_CHAIN (link))
- {
- tree label = TREE_VALUE (link);
+ /* Fall through. */
+ case TYPE_DECL:
+ case CONST_DECL:
+ common_symbol:
+ /* All of these go in BLOCK_VARS, but only if this is the
+ binding in the home scope. */
+ if (!b->nested)
+ {
+ TREE_CHAIN (p) = BLOCK_VARS (block);
+ BLOCK_VARS (block) = p;
+ }
+ /* If this is the file scope, and we are processing more
+ than one translation unit in this compilation, set
+ DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
+ This makes same_translation_unit_p work, and causes
+ static declarations to be given disambiguating suffixes. */
+ if (scope == file_scope && num_in_fnames > 1)
+ {
+ DECL_CONTEXT (p) = context;
+ if (TREE_CODE (p) == TYPE_DECL)
+ set_type_context (TREE_TYPE (p), context);
+ }
- if (DECL_INITIAL (label) == 0)
+ /* Fall through. */
+ /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
+ already been put there by store_parm_decls. Unused-
+ parameter warnings are handled by function.c.
+ error_mark_node obviously does not go in BLOCK_VARS and
+ does not get unused-variable warnings. */
+ case PARM_DECL:
+ case ERROR_MARK:
+ /* It is possible for a decl not to have a name. We get
+ here with b->id NULL in this case. */
+ if (b->id)
{
- error_with_decl (label, "label `%s' used but not defined");
- /* Avoid crashing later. */
- define_label (input_filename, lineno,
- DECL_NAME (label));
+ gcc_assert (I_SYMBOL_BINDING (b->id) == b);
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ if (b->shadowed && b->shadowed->type)
+ TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
}
- else if (warn_unused_label && !TREE_USED (label))
- warning_with_decl (label, "label `%s' defined but not used");
- IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
-
- /* Put the labels into the "variables" of the
- top-level block, so debugger can see them. */
- TREE_CHAIN (label) = BLOCK_VARS (block);
- BLOCK_VARS (block) = label;
+ break;
+
+ default:
+ gcc_unreachable ();
}
}
- /* Pop the current level, and free the structure for reuse. */
-
- {
- struct binding_level *level = current_binding_level;
- current_binding_level = current_binding_level->level_chain;
-
- level->level_chain = free_binding_level;
- free_binding_level = level;
- }
/* Dispose of the block that we just made inside some higher level. */
- if (functionbody)
- DECL_INITIAL (current_function_decl) = block;
- else if (block)
- {
- if (!block_previously_created)
- current_binding_level->blocks
- = chainon (current_binding_level->blocks, block);
- }
- /* If we did not make a block for the level just exited,
- any blocks made for inner levels
- (since they cannot be recorded as subblocks in that level)
- must be carried forward so they will later become subblocks
- of something else. */
- else if (subblocks)
- current_binding_level->blocks
- = chainon (current_binding_level->blocks, subblocks);
-
- /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
- binding contour so that they point to the appropriate construct, i.e.
- either to the current FUNCTION_DECL node, or else to the BLOCK node
- we just constructed.
-
- Note that for tagged types whose scope is just the formal parameter
- list for some function type specification, we can't properly set
- their TYPE_CONTEXTs here, because we don't have a pointer to the
- appropriate FUNCTION_TYPE node readily available to us. For those
- cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
- in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
- node which will represent the "scope" for these "parameter list local"
- tagged types. */
-
- if (functionbody)
- for (link = tags; link; link = TREE_CHAIN (link))
- TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
- else if (block)
- for (link = tags; link; link = TREE_CHAIN (link))
- TYPE_CONTEXT (TREE_VALUE (link)) = block;
-
- if (block)
- TREE_USED (block) = 1;
+ if ((scope->function_body || scope == file_scope) && context)
+ {
+ DECL_INITIAL (context) = block;
+ BLOCK_SUPERCONTEXT (block) = context;
+ }
+ else if (scope->outer)
+ {
+ if (block)
+ SCOPE_LIST_APPEND (scope->outer, blocks, block);
+ /* If we did not make a block for the scope just exited, any
+ blocks made for inner scopes must be carried forward so they
+ will later become subblocks of something else. */
+ else if (scope->blocks)
+ SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
+ }
- return block;
-}
+ /* Pop the current scope, and free the structure for reuse. */
+ current_scope = scope->outer;
+ if (scope->function_body)
+ current_function_scope = scope->outer_function;
-/* Insert BLOCK at the end of the list of subblocks of the
- current binding level. This is used when a BIND_EXPR is expanded,
- to handle the BLOCK node inside the BIND_EXPR. */
+ memset (scope, 0, sizeof (struct c_scope));
+ scope->outer = scope_freelist;
+ scope_freelist = scope;
-void
-insert_block (block)
- tree block;
-{
- TREE_USED (block) = 1;
- current_binding_level->blocks
- = chainon (current_binding_level->blocks, block);
+ return block;
}
-/* Set the BLOCK node for the innermost scope
- (the one we are currently in). */
-
-void
-set_block (block)
- tree block;
-{
- current_binding_level->this_block = block;
- current_binding_level->names = chainon (current_binding_level->names,
- BLOCK_VARS (block));
- current_binding_level->blocks = chainon (current_binding_level->blocks,
- BLOCK_SUBBLOCKS (block));
-}
-\f
void
-push_label_level ()
+push_file_scope (void)
{
- struct binding_level *newlevel;
-
- /* Reuse or create a struct for this binding level. */
+ tree decl;
- if (free_binding_level)
- {
- newlevel = free_binding_level;
- free_binding_level = free_binding_level->level_chain;
- }
- else
- {
- newlevel = make_binding_level ();
- }
+ if (file_scope)
+ return;
- /* Add this level to the front of the chain (stack) of label levels. */
+ push_scope ();
+ file_scope = current_scope;
- newlevel->level_chain = label_level_chain;
- label_level_chain = newlevel;
+ start_fname_decls ();
- newlevel->names = named_labels;
- newlevel->shadowed = shadowed_labels;
- named_labels = 0;
- shadowed_labels = 0;
+ for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
+ bind (DECL_NAME (decl), decl, file_scope,
+ /*invisible=*/false, /*nested=*/true);
}
void
-pop_label_level ()
+pop_file_scope (void)
{
- struct binding_level *level = label_level_chain;
- tree link, prev;
+ /* In case there were missing closebraces, get us back to the global
+ binding level. */
+ while (current_scope != file_scope)
+ pop_scope ();
+
+ /* __FUNCTION__ is defined at file scope (""). This
+ call may not be necessary as my tests indicate it
+ still works without it. */
+ finish_fname_decls ();
- /* Clear out the definitions of the declared labels in this level.
- Leave in the list any ordinary, non-declared labels. */
- for (link = named_labels, prev = 0; link;)
+ /* This is the point to write out a PCH if we're doing that.
+ In that case we do not want to do anything else. */
+ if (pch_file)
{
- if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
- {
- if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
- {
- error_with_decl (TREE_VALUE (link),
- "label `%s' used but not defined");
- /* Avoid crashing later. */
- define_label (input_filename, lineno,
- DECL_NAME (TREE_VALUE (link)));
- }
- else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
- warning_with_decl (TREE_VALUE (link),
- "label `%s' defined but not used");
- IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
-
- /* Delete this element from the list. */
- link = TREE_CHAIN (link);
- if (prev)
- TREE_CHAIN (prev) = link;
- else
- named_labels = link;
- }
- else
- {
- prev = link;
- link = TREE_CHAIN (link);
- }
+ c_common_write_pch ();
+ return;
}
- /* Bring back all the labels that were shadowed. */
- for (link = shadowed_labels; link; link = TREE_CHAIN (link))
- if (DECL_NAME (TREE_VALUE (link)) != 0)
- IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
- = TREE_VALUE (link);
+ /* Pop off the file scope and close this translation unit. */
+ pop_scope ();
+ file_scope = 0;
- named_labels = chainon (named_labels, level->names);
- shadowed_labels = level->shadowed;
-
- /* Pop the current level, and free the structure for reuse. */
- label_level_chain = label_level_chain->level_chain;
- level->level_chain = free_binding_level;
- free_binding_level = level;
+ maybe_apply_pending_pragma_weaks ();
+ cgraph_finalize_compilation_unit ();
}
+
\f
/* Push a definition or a declaration of struct, union or enum tag "name".
"type" should be the type node.
Note that the definition may really be just a forward reference.
In that case, the TYPE_SIZE will be zero. */
-void
-pushtag (name, type)
- tree name, type;
+static void
+pushtag (tree name, tree type)
{
- struct binding_level *b;
-
- /* Find the proper binding level for this type tag. */
-
- for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
- continue;
-
- if (name)
- {
- /* Record the identifier as the type's name if it has none. */
-
- if (TYPE_NAME (type) == 0)
- TYPE_NAME (type) = name;
- }
-
- b->tags = tree_cons (name, type, b->tags);
+ /* Record the identifier as the type's name if it has none. */
+ if (name && !TYPE_NAME (type))
+ TYPE_NAME (type) = name;
+ bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
/* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
- tagged type we just added to the current binding level. This fake
+ tagged type we just added to the current scope. This fake
NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
to output a representation of a tagged type, and it also gives
us a convenient place to record the "scope start" address for the
TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
/* An approximation for now, so we can tell this is a function-scope tag.
- This will be updated in poplevel. */
+ This will be updated in pop_scope. */
TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
}
\f
-/* Handle when a new declaration NEWDECL
- has the same name as an old one OLDDECL
- in the same binding contour.
- Prints an error message if appropriate.
+/* Subroutine of compare_decls. Allow harmless mismatches in return
+ and argument types provided that the type modes match. This function
+ return a unified type given a suitable match, and 0 otherwise. */
+
+static tree
+match_builtin_function_types (tree newtype, tree oldtype)
+{
+ tree newrettype, oldrettype;
+ tree newargs, oldargs;
+ tree trytype, tryargs;
+
+ /* Accept the return type of the new declaration if same modes. */
+ oldrettype = TREE_TYPE (oldtype);
+ newrettype = TREE_TYPE (newtype);
+
+ if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
+ return 0;
+
+ oldargs = TYPE_ARG_TYPES (oldtype);
+ newargs = TYPE_ARG_TYPES (newtype);
+ tryargs = newargs;
+
+ while (oldargs || newargs)
+ {
+ if (!oldargs
+ || !newargs
+ || !TREE_VALUE (oldargs)
+ || !TREE_VALUE (newargs)
+ || TYPE_MODE (TREE_VALUE (oldargs))
+ != TYPE_MODE (TREE_VALUE (newargs)))
+ return 0;
- If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
- Otherwise, return 0.
+ oldargs = TREE_CHAIN (oldargs);
+ newargs = TREE_CHAIN (newargs);
+ }
- When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
- and OLDDECL is in an outer binding level and should thus not be changed. */
+ trytype = build_function_type (newrettype, tryargs);
+ return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
+}
-static int
-duplicate_decls (newdecl, olddecl, different_binding_level)
- tree newdecl, olddecl;
- int different_binding_level;
+/* Subroutine of diagnose_mismatched_decls. Check for function type
+ mismatch involving an empty arglist vs a nonempty one and give clearer
+ diagnostics. */
+static void
+diagnose_arglist_conflict (tree newdecl, tree olddecl,
+ tree newtype, tree oldtype)
{
- int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
- int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
- && DECL_INITIAL (newdecl) != 0);
- tree oldtype = TREE_TYPE (olddecl);
- tree newtype = TREE_TYPE (newdecl);
- int errmsg = 0;
-
- if (DECL_P (olddecl))
- {
- if (TREE_CODE (newdecl) == FUNCTION_DECL
- && TREE_CODE (olddecl) == FUNCTION_DECL
- && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
+ tree t;
+
+ if (TREE_CODE (olddecl) != FUNCTION_DECL
+ || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
+ || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
+ ||
+ (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
+ return;
+
+ t = TYPE_ARG_TYPES (oldtype);
+ if (t == 0)
+ t = TYPE_ARG_TYPES (newtype);
+ for (; t; t = TREE_CHAIN (t))
+ {
+ tree type = TREE_VALUE (t);
+
+ if (TREE_CHAIN (t) == 0
+ && TYPE_MAIN_VARIANT (type) != void_type_node)
{
- if (DECL_DECLARED_INLINE_P (newdecl)
- && DECL_UNINLINABLE (newdecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
- /* Already warned elsewhere. */;
- else if (DECL_DECLARED_INLINE_P (olddecl)
- && DECL_UNINLINABLE (olddecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
- /* Already warned. */;
- else if (DECL_DECLARED_INLINE_P (newdecl)
- && ! DECL_DECLARED_INLINE_P (olddecl)
- && DECL_UNINLINABLE (olddecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
- {
- warning_with_decl (newdecl,
- "function `%s' redeclared as inline");
- warning_with_decl (olddecl,
- "previous declaration of function `%s' with attribute noinline");
- }
- else if (DECL_DECLARED_INLINE_P (olddecl)
- && DECL_UNINLINABLE (newdecl)
- && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
- {
- warning_with_decl (newdecl,
- "function `%s' redeclared with attribute noinline");
- warning_with_decl (olddecl,
- "previous declaration of function `%s' was inline");
- }
+ inform (input_location, "a parameter list with an ellipsis can%'t match "
+ "an empty parameter name list declaration");
+ break;
}
- DECL_ATTRIBUTES (newdecl)
- = (*targetm.merge_decl_attributes) (olddecl, newdecl);
+ if (c_type_promotes_to (type) != type)
+ {
+ inform (input_location, "an argument type that has a default promotion can%'t match "
+ "an empty parameter name list declaration");
+ break;
+ }
}
+}
- if (TREE_CODE (newtype) == ERROR_MARK
- || TREE_CODE (oldtype) == ERROR_MARK)
- types_match = 0;
+/* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
+ old-style function definition, NEWDECL is a prototype declaration.
+ Diagnose inconsistencies in the argument list. Returns TRUE if
+ the prototype is compatible, FALSE if not. */
+static bool
+validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
+{
+ tree newargs, oldargs;
+ int i;
- /* New decl is completely inconsistent with the old one =>
- tell caller to replace the old one.
- This is always an error except in the case of shadowing a builtin. */
- if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
+#define END_OF_ARGLIST(t) ((t) == void_type_node)
+
+ oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
+ newargs = TYPE_ARG_TYPES (newtype);
+ i = 1;
+
+ for (;;)
{
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && (DECL_BUILT_IN (olddecl)
- || DECL_BUILT_IN_NONANSI (olddecl)))
+ tree oldargtype = TREE_VALUE (oldargs);
+ tree newargtype = TREE_VALUE (newargs);
+
+ if (oldargtype == error_mark_node || newargtype == error_mark_node)
+ return false;
+
+ oldargtype = TYPE_MAIN_VARIANT (oldargtype);
+ newargtype = TYPE_MAIN_VARIANT (newargtype);
+
+ if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
+ break;
+
+ /* Reaching the end of just one list means the two decls don't
+ agree on the number of arguments. */
+ if (END_OF_ARGLIST (oldargtype))
{
- /* If you declare a built-in or predefined function name as static,
- the old definition is overridden,
- but optionally warn this was a bad choice of name. */
- if (!TREE_PUBLIC (newdecl))
- {
- if (!warn_shadow)
- ;
- else if (DECL_BUILT_IN (olddecl))
- warning_with_decl (newdecl, "shadowing built-in function `%s'");
- else
- warning_with_decl (newdecl, "shadowing library function `%s'");
- }
- /* Likewise, if the built-in is not ansi, then programs can
- override it even globally without an error. */
- else if (! DECL_BUILT_IN (olddecl))
- warning_with_decl (newdecl,
- "library function `%s' declared as non-function");
-
- else if (DECL_BUILT_IN_NONANSI (olddecl))
- warning_with_decl (newdecl,
- "built-in function `%s' declared as non-function");
- else
- warning_with_decl (newdecl,
- "built-in function `%s' declared as non-function");
+ error ("prototype for %q+D declares more arguments "
+ "than previous old-style definition", newdecl);
+ return false;
}
- else
+ else if (END_OF_ARGLIST (newargtype))
{
- error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
- error_with_decl (olddecl, "previous declaration of `%s'");
+ error ("prototype for %q+D declares fewer arguments "
+ "than previous old-style definition", newdecl);
+ return false;
}
- return 0;
- }
+ /* Type for passing arg must be consistent with that declared
+ for the arg. */
+ else if (!comptypes (oldargtype, newargtype))
+ {
+ error ("prototype for %q+D declares argument %d"
+ " with incompatible type",
+ newdecl, i);
+ return false;
+ }
- /* For real parm decl following a forward decl,
- return 1 so old decl will be reused. */
- if (types_match && TREE_CODE (newdecl) == PARM_DECL
- && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
- return 1;
+ oldargs = TREE_CHAIN (oldargs);
+ newargs = TREE_CHAIN (newargs);
+ i++;
+ }
- /* The new declaration is the same kind of object as the old one.
- The declarations may partially match. Print warnings if they don't
- match enough. Ultimately, copy most of the information from the new
- decl to the old one, and keep using the old one. */
+ /* If we get here, no errors were found, but do issue a warning
+ for this poor-style construct. */
+ warning (0, "prototype for %q+D follows non-prototype definition",
+ newdecl);
+ return true;
+#undef END_OF_ARGLIST
+}
- if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
- && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
- && DECL_INITIAL (olddecl) == 0)
- /* If -traditional, avoid error for redeclaring fcn
- after implicit decl. */
+/* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
+ first in a pair of mismatched declarations, using the diagnostic
+ function DIAG. */
+static void
+locate_old_decl (tree decl)
+{
+ if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
;
- else if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_BUILT_IN (olddecl))
+ else if (DECL_INITIAL (decl))
+ inform (input_location, "previous definition of %q+D was here", decl);
+ else if (C_DECL_IMPLICIT (decl))
+ inform (input_location, "previous implicit declaration of %q+D was here", decl);
+ else
+ inform (input_location, "previous declaration of %q+D was here", decl);
+}
+
+/* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
+ Returns true if the caller should proceed to merge the two, false
+ if OLDDECL should simply be discarded. As a side effect, issues
+ all necessary diagnostics for invalid or poor-style combinations.
+ If it returns true, writes the types of NEWDECL and OLDDECL to
+ *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
+ TREE_TYPE (NEWDECL, OLDDECL) respectively. */
+
+static bool
+diagnose_mismatched_decls (tree newdecl, tree olddecl,
+ tree *newtypep, tree *oldtypep)
+{
+ tree newtype, oldtype;
+ bool pedwarned = false;
+ bool warned = false;
+ bool retval = true;
+
+#define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
+ && DECL_EXTERNAL (DECL))
+
+ /* If we have error_mark_node for either decl or type, just discard
+ the previous decl - we're in an error cascade already. */
+ if (olddecl == error_mark_node || newdecl == error_mark_node)
+ return false;
+ *oldtypep = oldtype = TREE_TYPE (olddecl);
+ *newtypep = newtype = TREE_TYPE (newdecl);
+ if (oldtype == error_mark_node || newtype == error_mark_node)
+ return false;
+
+ /* Two different categories of symbol altogether. This is an error
+ unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
+ if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
{
- /* A function declaration for a built-in function. */
- if (!TREE_PUBLIC (newdecl))
+ if (!(TREE_CODE (olddecl) == FUNCTION_DECL
+ && DECL_BUILT_IN (olddecl)
+ && !C_DECL_DECLARED_BUILTIN (olddecl)))
{
- /* If you declare a built-in function name as static, the
- built-in definition is overridden,
- but optionally warn this was a bad choice of name. */
- if (warn_shadow)
- warning_with_decl (newdecl, "shadowing built-in function `%s'");
- /* Discard the old built-in function. */
- return 0;
+ error ("%q+D redeclared as different kind of symbol", newdecl);
+ locate_old_decl (olddecl);
}
- else if (!types_match)
- {
- /* Accept the return type of the new declaration if same modes. */
- tree oldreturntype = TREE_TYPE (oldtype);
- tree newreturntype = TREE_TYPE (newtype);
+ else if (TREE_PUBLIC (newdecl))
+ warning (0, "built-in function %q+D declared as non-function",
+ newdecl);
+ else
+ warning (OPT_Wshadow, "declaration of %q+D shadows "
+ "a built-in function", newdecl);
+ return false;
+ }
- if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
- {
- /* Function types may be shared, so we can't just modify
- the return type of olddecl's function type. */
- tree trytype
- = build_function_type (newreturntype,
- TYPE_ARG_TYPES (oldtype));
- trytype = build_type_attribute_variant (trytype,
- TYPE_ATTRIBUTES (oldtype));
-
- types_match = comptypes (newtype, trytype);
- if (types_match)
- oldtype = trytype;
- }
- /* Accept harmless mismatch in first argument type also.
+ /* Enumerators have no linkage, so may only be declared once in a
+ given scope. */
+ if (TREE_CODE (olddecl) == CONST_DECL)
+ {
+ error ("redeclaration of enumerator %q+D", newdecl);
+ locate_old_decl (olddecl);
+ return false;
+ }
+
+ if (!comptypes (oldtype, newtype))
+ {
+ if (TREE_CODE (olddecl) == FUNCTION_DECL
+ && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
+ {
+ /* Accept harmless mismatch in function types.
This is for the ffs and fprintf builtins. */
- if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
- && TYPE_ARG_TYPES (oldtype) != 0
- && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
- && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
- && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
- == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
+ tree trytype = match_builtin_function_types (newtype, oldtype);
+
+ if (trytype && comptypes (newtype, trytype))
+ *oldtypep = oldtype = trytype;
+ else
{
- /* Function types may be shared, so we can't just modify
- the return type of olddecl's function type. */
- tree trytype
- = build_function_type (TREE_TYPE (oldtype),
- tree_cons (NULL_TREE,
- TREE_VALUE (TYPE_ARG_TYPES (newtype)),
- TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
- trytype = build_type_attribute_variant (trytype,
- TYPE_ATTRIBUTES (oldtype));
-
- types_match = comptypes (newtype, trytype);
- if (types_match)
- oldtype = trytype;
+ /* If types don't match for a built-in, throw away the
+ built-in. No point in calling locate_old_decl here, it
+ won't print anything. */
+ warning (0, "conflicting types for built-in function %q+D",
+ newdecl);
+ return false;
}
- if (! different_binding_level)
- TREE_TYPE (olddecl) = oldtype;
}
- else if (TYPE_ARG_TYPES (oldtype) == NULL
- && TYPE_ARG_TYPES (newtype) != NULL)
+ else if (TREE_CODE (olddecl) == FUNCTION_DECL
+ && DECL_IS_BUILTIN (olddecl))
{
- /* For bcmp, bzero, fputs the builtin type has arguments not
- specified. Use the ones from the prototype so that type checking
- is done for them. */
- tree trytype
- = build_function_type (TREE_TYPE (oldtype),
- TYPE_ARG_TYPES (newtype));
- trytype = build_type_attribute_variant (trytype,
- TYPE_ATTRIBUTES (oldtype));
-
- oldtype = trytype;
- if (! different_binding_level)
- TREE_TYPE (olddecl) = oldtype;
+ /* A conflicting function declaration for a predeclared
+ function that isn't actually built in. Objective C uses
+ these. The new declaration silently overrides everything
+ but the volatility (i.e. noreturn) indication. See also
+ below. FIXME: Make Objective C use normal builtins. */
+ TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
+ return false;
}
- if (!types_match)
+ /* Permit void foo (...) to match int foo (...) if the latter is
+ the definition and implicit int was used. See
+ c-torture/compile/920625-2.c. */
+ else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
+ && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
+ && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
+ && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
{
- /* If types don't match for a built-in, throw away the built-in. */
- warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
- return 0;
+ pedwarned = pedwarn (input_location, 0,
+ "conflicting types for %q+D", newdecl);
+ /* Make sure we keep void as the return type. */
+ TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
+ C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
}
- }
- else if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_SOURCE_LINE (olddecl) == 0)
- {
- /* A function declaration for a predeclared function
- that isn't actually built in. */
- if (!TREE_PUBLIC (newdecl))
+ /* Permit void foo (...) to match an earlier call to foo (...) with
+ no declared type (thus, implicitly int). */
+ else if (TREE_CODE (newdecl) == FUNCTION_DECL
+ && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
+ && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
+ && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
{
- /* If you declare it as static, the
- default definition is overridden. */
- return 0;
+ pedwarned = pedwarn (input_location, 0,
+ "conflicting types for %q+D", newdecl);
+ /* Make sure we keep void as the return type. */
+ TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
}
- else if (!types_match)
+ else
{
- /* If the types don't match, preserve volatility indication.
- Later on, we will discard everything else about the
- default declaration. */
- TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
+ if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
+ error ("conflicting type qualifiers for %q+D", newdecl);
+ else
+ error ("conflicting types for %q+D", newdecl);
+ diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
+ locate_old_decl (olddecl);
+ return false;
}
}
- /* Permit char *foo () to match void *foo (...) if not pedantic,
- if one of them came from a system header file. */
- else if (!types_match
- && TREE_CODE (olddecl) == FUNCTION_DECL
- && TREE_CODE (newdecl) == FUNCTION_DECL
- && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
- && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
- && (DECL_IN_SYSTEM_HEADER (olddecl)
- || DECL_IN_SYSTEM_HEADER (newdecl))
- && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
- && TYPE_ARG_TYPES (oldtype) == 0
- && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
- && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
- ||
- (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
- && TYPE_ARG_TYPES (newtype) == 0
- && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
- && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
- {
- if (pedantic)
- pedwarn_with_decl (newdecl, "conflicting types for `%s'");
- /* Make sure we keep void * as ret type, not char *. */
- if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
- TREE_TYPE (newdecl) = newtype = oldtype;
-
- /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
- we will come back here again. */
- DECL_IN_SYSTEM_HEADER (newdecl) = 1;
- }
- else if (!types_match
- /* Permit char *foo (int, ...); followed by char *foo ();
- if not pedantic. */
- && ! (TREE_CODE (olddecl) == FUNCTION_DECL
- && ! pedantic
- /* Return types must still match. */
- && comptypes (TREE_TYPE (oldtype),
- TREE_TYPE (newtype))
- && TYPE_ARG_TYPES (newtype) == 0))
- {
- error_with_decl (newdecl, "conflicting types for `%s'");
- /* Check for function type mismatch
- involving an empty arglist vs a nonempty one. */
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && comptypes (TREE_TYPE (oldtype),
- TREE_TYPE (newtype))
- && ((TYPE_ARG_TYPES (oldtype) == 0
- && DECL_INITIAL (olddecl) == 0)
- ||
- (TYPE_ARG_TYPES (newtype) == 0
- && DECL_INITIAL (newdecl) == 0)))
- {
- /* Classify the problem further. */
- tree t = TYPE_ARG_TYPES (oldtype);
- if (t == 0)
- t = TYPE_ARG_TYPES (newtype);
- for (; t; t = TREE_CHAIN (t))
- {
- tree type = TREE_VALUE (t);
- if (TREE_CHAIN (t) == 0
- && TYPE_MAIN_VARIANT (type) != void_type_node)
- {
- error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
- break;
- }
+ /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
+ but silently ignore the redeclaration if either is in a system
+ header. (Conflicting redeclarations were handled above.) */
+ if (TREE_CODE (newdecl) == TYPE_DECL)
+ {
+ if (DECL_IN_SYSTEM_HEADER (newdecl)
+ || DECL_IN_SYSTEM_HEADER (olddecl)
+ || TREE_NO_WARNING (newdecl)
+ || TREE_NO_WARNING (olddecl))
+ return true; /* Allow OLDDECL to continue in use. */
+
+ error ("redefinition of typedef %q+D", newdecl);
+ locate_old_decl (olddecl);
+ return false;
+ }
+
+ /* Function declarations can either be 'static' or 'extern' (no
+ qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
+ can never conflict with each other on account of linkage
+ (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
+ gnu89 mode permits two definitions if one is 'extern inline' and
+ one is not. The non- extern-inline definition supersedes the
+ extern-inline definition. */
- if (simple_type_promotes_to (type) != NULL_TREE)
+ else if (TREE_CODE (newdecl) == FUNCTION_DECL)
+ {
+ /* If you declare a built-in function name as static, or
+ define the built-in with an old-style definition (so we
+ can't validate the argument list) the built-in definition is
+ overridden, but optionally warn this was a bad choice of name. */
+ if (DECL_BUILT_IN (olddecl)
+ && !C_DECL_DECLARED_BUILTIN (olddecl)
+ && (!TREE_PUBLIC (newdecl)
+ || (DECL_INITIAL (newdecl)
+ && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
+ {
+ warning (OPT_Wshadow, "declaration of %q+D shadows "
+ "a built-in function", newdecl);
+ /* Discard the old built-in function. */
+ return false;
+ }
+
+ if (DECL_INITIAL (newdecl))
+ {
+ if (DECL_INITIAL (olddecl))
+ {
+ /* If both decls are in the same TU and the new declaration
+ isn't overriding an extern inline reject the new decl.
+ In c99, no overriding is allowed in the same translation
+ unit. */
+ if ((!DECL_EXTERN_INLINE (olddecl)
+ || DECL_EXTERN_INLINE (newdecl)
+ || (!flag_gnu89_inline
+ && (!DECL_DECLARED_INLINE_P (olddecl)
+ || !lookup_attribute ("gnu_inline",
+ DECL_ATTRIBUTES (olddecl)))
+ && (!DECL_DECLARED_INLINE_P (newdecl)
+ || !lookup_attribute ("gnu_inline",
+ DECL_ATTRIBUTES (newdecl))))
+ )
+ && same_translation_unit_p (newdecl, olddecl))
{
- error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
- break;
+ error ("redefinition of %q+D", newdecl);
+ locate_old_decl (olddecl);
+ return false;
}
}
}
- error_with_decl (olddecl, "previous declaration of `%s'");
+ /* If we have a prototype after an old-style function definition,
+ the argument types must be checked specially. */
+ else if (DECL_INITIAL (olddecl)
+ && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
+ && TYPE_ACTUAL_ARG_TYPES (oldtype)
+ && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
+ {
+ locate_old_decl (olddecl);
+ return false;
+ }
+ /* A non-static declaration (even an "extern") followed by a
+ static declaration is undefined behavior per C99 6.2.2p3-5,7.
+ The same is true for a static forward declaration at block
+ scope followed by a non-static declaration/definition at file
+ scope. Static followed by non-static at the same scope is
+ not undefined behavior, and is the most convenient way to get
+ some effects (see e.g. what unwind-dw2-fde-glibc.c does to
+ the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
+ we do diagnose it if -Wtraditional. */
+ if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
+ {
+ /* Two exceptions to the rule. If olddecl is an extern
+ inline, or a predeclared function that isn't actually
+ built in, newdecl silently overrides olddecl. The latter
+ occur only in Objective C; see also above. (FIXME: Make
+ Objective C use normal builtins.) */
+ if (!DECL_IS_BUILTIN (olddecl)
+ && !DECL_EXTERN_INLINE (olddecl))
+ {
+ error ("static declaration of %q+D follows "
+ "non-static declaration", newdecl);
+ locate_old_decl (olddecl);
+ }
+ return false;
+ }
+ else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
+ {
+ if (DECL_CONTEXT (olddecl))
+ {
+ error ("non-static declaration of %q+D follows "
+ "static declaration", newdecl);
+ locate_old_decl (olddecl);
+ return false;
+ }
+ else if (warn_traditional)
+ {
+ warned |= warning (OPT_Wtraditional,
+ "non-static declaration of %q+D "
+ "follows static declaration", newdecl);
+ }
+ }
- /* This is safer because the initializer might contain references
- to variables that were declared between olddecl and newdecl. This
- will make the initializer invalid for olddecl in case it gets
- assigned to olddecl below. */
- if (TREE_CODE (newdecl) == VAR_DECL)
- DECL_INITIAL (newdecl) = 0;
- }
- else
- {
- errmsg = redeclaration_error_message (newdecl, olddecl);
- if (errmsg)
+ /* Make sure gnu_inline attribute is either not present, or
+ present on all inline decls. */
+ if (DECL_DECLARED_INLINE_P (olddecl)
+ && DECL_DECLARED_INLINE_P (newdecl))
{
- switch (errmsg)
+ bool newa = lookup_attribute ("gnu_inline",
+ DECL_ATTRIBUTES (newdecl)) != NULL;
+ bool olda = lookup_attribute ("gnu_inline",
+ DECL_ATTRIBUTES (olddecl)) != NULL;
+ if (newa != olda)
{
- case 1:
- error_with_decl (newdecl, "redefinition of `%s'");
- break;
- case 2:
- error_with_decl (newdecl, "redeclaration of `%s'");
- break;
- case 3:
- error_with_decl (newdecl, "conflicting declarations of `%s'");
- break;
- default:
- abort ();
+ error ("%<gnu_inline%> attribute present on %q+D",
+ newa ? newdecl : olddecl);
+ error ("%Jbut not here", newa ? olddecl : newdecl);
}
+ }
+ }
+ else if (TREE_CODE (newdecl) == VAR_DECL)
+ {
+ /* Only variables can be thread-local, and all declarations must
+ agree on this property. */
+ if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
+ {
+ /* Nothing to check. Since OLDDECL is marked threadprivate
+ and NEWDECL does not have a thread-local attribute, we
+ will merge the threadprivate attribute into NEWDECL. */
+ ;
+ }
+ else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
+ {
+ if (DECL_THREAD_LOCAL_P (newdecl))
+ error ("thread-local declaration of %q+D follows "
+ "non-thread-local declaration", newdecl);
+ else
+ error ("non-thread-local declaration of %q+D follows "
+ "thread-local declaration", newdecl);
- error_with_decl (olddecl,
- ((DECL_INITIAL (olddecl)
- && current_binding_level == global_binding_level)
- ? "`%s' previously defined here"
- : "`%s' previously declared here"));
- return 0;
+ locate_old_decl (olddecl);
+ return false;
}
- else if (TREE_CODE (newdecl) == TYPE_DECL
- && (DECL_IN_SYSTEM_HEADER (olddecl)
- || DECL_IN_SYSTEM_HEADER (newdecl)))
+
+ /* Multiple initialized definitions are not allowed (6.9p3,5). */
+ if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
{
- warning_with_decl (newdecl, "redefinition of `%s'");
- warning_with_decl
- (olddecl,
- ((DECL_INITIAL (olddecl)
- && current_binding_level == global_binding_level)
- ? "`%s' previously defined here"
- : "`%s' previously declared here"));
+ error ("redefinition of %q+D", newdecl);
+ locate_old_decl (olddecl);
+ return false;
}
- else if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_INITIAL (olddecl) != 0
- && TYPE_ARG_TYPES (oldtype) == 0
- && TYPE_ARG_TYPES (newtype) != 0
- && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
+
+ /* Objects declared at file scope: if the first declaration had
+ external linkage (even if it was an external reference) the
+ second must have external linkage as well, or the behavior is
+ undefined. If the first declaration had internal linkage, then
+ the second must too, or else be an external reference (in which
+ case the composite declaration still has internal linkage).
+ As for function declarations, we warn about the static-then-
+ extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
+ if (DECL_FILE_SCOPE_P (newdecl)
+ && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
{
- tree type, parm;
- int nargs;
- /* Prototype decl follows defn w/o prototype. */
-
- for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
- type = TYPE_ARG_TYPES (newtype),
- nargs = 1;
- ;
- parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
+ if (DECL_EXTERNAL (newdecl))
{
- if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
- && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
- {
- warning_with_decl (newdecl, "prototype for `%s' follows");
- warning_with_decl (olddecl, "non-prototype definition here");
- break;
- }
- if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
- || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
+ if (!DECL_FILE_SCOPE_P (olddecl))
{
- error_with_decl (newdecl,
- "prototype for `%s' follows and number of arguments doesn't match");
- error_with_decl (olddecl, "non-prototype definition here");
- errmsg = 1;
- break;
+ error ("extern declaration of %q+D follows "
+ "declaration with no linkage", newdecl);
+ locate_old_decl (olddecl);
+ return false;
}
- /* Type for passing arg must be consistent
- with that declared for the arg. */
- if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
- /* If -traditional, allow `unsigned int' instead of `int'
- in the prototype. */
- && (! (flag_traditional
- && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
- && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
+ else if (warn_traditional)
{
- error_with_decl (newdecl,
- "prototype for `%s' follows and argument %d doesn't match",
- nargs);
- error_with_decl (olddecl, "non-prototype definition here");
- errmsg = 1;
- break;
+ warned |= warning (OPT_Wtraditional,
+ "non-static declaration of %q+D "
+ "follows static declaration", newdecl);
}
}
+ else
+ {
+ if (TREE_PUBLIC (newdecl))
+ error ("non-static declaration of %q+D follows "
+ "static declaration", newdecl);
+ else
+ error ("static declaration of %q+D follows "
+ "non-static declaration", newdecl);
+
+ locate_old_decl (olddecl);
+ return false;
+ }
}
- /* Warn about mismatches in various flags. */
- else
+ /* Two objects with the same name declared at the same block
+ scope must both be external references (6.7p3). */
+ else if (!DECL_FILE_SCOPE_P (newdecl))
{
- /* Warn if function is now inline
- but was previously declared not inline and has been called. */
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && ! DECL_DECLARED_INLINE_P (olddecl)
- && DECL_DECLARED_INLINE_P (newdecl)
- && TREE_USED (olddecl))
- warning_with_decl (newdecl,
- "`%s' declared inline after being called");
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && ! DECL_DECLARED_INLINE_P (olddecl)
- && DECL_DECLARED_INLINE_P (newdecl)
- && DECL_INITIAL (olddecl) != 0)
- warning_with_decl (newdecl,
- "`%s' declared inline after its definition");
-
- /* If pedantic, warn when static declaration follows a non-static
- declaration. Otherwise, do so only for functions. */
- if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
- && TREE_PUBLIC (olddecl)
- && !TREE_PUBLIC (newdecl))
- warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
-
- /* If warn_traditional, warn when a non-static function
- declaration follows a static one. */
- if (warn_traditional && !in_system_header
- && TREE_CODE (olddecl) == FUNCTION_DECL
- && !TREE_PUBLIC (olddecl)
- && TREE_PUBLIC (newdecl))
- warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
-
- /* Warn when const declaration follows a non-const
- declaration, but not for functions. */
- if (TREE_CODE (olddecl) != FUNCTION_DECL
- && !TREE_READONLY (olddecl)
- && TREE_READONLY (newdecl))
- warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
- /* These bits are logically part of the type, for variables.
- But not for functions
- (where qualifiers are not valid ANSI anyway). */
- else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
- && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
- || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
- pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
+ if (DECL_EXTERNAL (newdecl))
+ {
+ /* Extern with initializer at block scope, which will
+ already have received an error. */
+ }
+ else if (DECL_EXTERNAL (olddecl))
+ {
+ error ("declaration of %q+D with no linkage follows "
+ "extern declaration", newdecl);
+ locate_old_decl (olddecl);
+ }
+ else
+ {
+ error ("redeclaration of %q+D with no linkage", newdecl);
+ locate_old_decl (olddecl);
+ }
+
+ return false;
}
}
- /* Optionally warn about more than one declaration for the same name. */
- if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
- /* Don't warn about a function declaration
- followed by a definition. */
- && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
- && DECL_INITIAL (olddecl) == 0)
- /* Don't warn about extern decl followed by (tentative) definition. */
- && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
+ /* warnings */
+ /* All decls must agree on a visibility. */
+ if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
+ && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
+ && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
{
- warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
- warning_with_decl (olddecl, "previous declaration of `%s'");
+ warned |= warning (0, "redeclaration of %q+D with different visibility "
+ "(old visibility preserved)", newdecl);
}
- /* Copy all the DECL_... slots specified in the new decl
- except for any that we copy here from the old type.
-
- Past this point, we don't change OLDTYPE and NEWTYPE
- even if we change the types of NEWDECL and OLDDECL. */
-
- if (types_match)
+ if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
- /* When copying info to olddecl, we store into write_olddecl
- instead. This allows us to avoid modifying olddecl when
- different_binding_level is true. */
- tree write_olddecl = different_binding_level ? newdecl : olddecl;
-
- /* Merge the data types specified in the two decls. */
- if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
+ /* Diagnose inline __attribute__ ((noinline)) which is silly. */
+ if (DECL_DECLARED_INLINE_P (newdecl)
+ && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
{
- if (different_binding_level)
- {
- if (TYPE_ARG_TYPES (oldtype) != 0
- && TYPE_ARG_TYPES (newtype) == 0)
- TREE_TYPE (newdecl) = common_type (newtype, oldtype);
- else
- TREE_TYPE (newdecl)
- = build_type_attribute_variant
- (newtype,
- merge_attributes (TYPE_ATTRIBUTES (newtype),
- TYPE_ATTRIBUTES (oldtype)));
- }
- else
- TREE_TYPE (newdecl)
- = TREE_TYPE (olddecl)
- = common_type (newtype, oldtype);
+ warned |= warning (OPT_Wattributes,
+ "inline declaration of %qD follows "
+ "declaration with attribute noinline", newdecl);
}
-
- /* Lay the type out, unless already done. */
- if (oldtype != TREE_TYPE (newdecl))
+ else if (DECL_DECLARED_INLINE_P (olddecl)
+ && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
{
- if (TREE_TYPE (newdecl) != error_mark_node)
- layout_type (TREE_TYPE (newdecl));
- if (TREE_CODE (newdecl) != FUNCTION_DECL
- && TREE_CODE (newdecl) != TYPE_DECL
- && TREE_CODE (newdecl) != CONST_DECL)
- layout_decl (newdecl, 0);
+ warned |= warning (OPT_Wattributes,
+ "declaration of %q+D with attribute "
+ "noinline follows inline declaration ", newdecl);
}
- else
+ }
+ else /* PARM_DECL, VAR_DECL */
+ {
+ /* Redeclaration of a parameter is a constraint violation (this is
+ not explicitly stated, but follows from C99 6.7p3 [no more than
+ one declaration of the same identifier with no linkage in the
+ same scope, except type tags] and 6.2.2p6 [parameters have no
+ linkage]). We must check for a forward parameter declaration,
+ indicated by TREE_ASM_WRITTEN on the old declaration - this is
+ an extension, the mandatory diagnostic for which is handled by
+ mark_forward_parm_decls. */
+
+ if (TREE_CODE (newdecl) == PARM_DECL
+ && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
{
- /* Since the type is OLDDECL's, make OLDDECL's size go with. */
- DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
- DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
- DECL_MODE (newdecl) = DECL_MODE (olddecl);
- if (TREE_CODE (olddecl) != FUNCTION_DECL)
- if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
- {
- DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
- DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
- }
+ error ("redefinition of parameter %q+D", newdecl);
+ locate_old_decl (olddecl);
+ return false;
}
+ }
- /* Keep the old rtl since we can safely use it. */
- COPY_DECL_RTL (olddecl, newdecl);
+ /* Optional warning for completely redundant decls. */
+ if (!warned && !pedwarned
+ && warn_redundant_decls
+ /* Don't warn about a function declaration followed by a
+ definition. */
+ && !(TREE_CODE (newdecl) == FUNCTION_DECL
+ && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
+ /* Don't warn about redundant redeclarations of builtins. */
+ && !(TREE_CODE (newdecl) == FUNCTION_DECL
+ && !DECL_BUILT_IN (newdecl)
+ && DECL_BUILT_IN (olddecl)
+ && !C_DECL_DECLARED_BUILTIN (olddecl))
+ /* Don't warn about an extern followed by a definition. */
+ && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
+ /* Don't warn about forward parameter decls. */
+ && !(TREE_CODE (newdecl) == PARM_DECL
+ && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
+ /* Don't warn about a variable definition following a declaration. */
+ && !(TREE_CODE (newdecl) == VAR_DECL
+ && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
+ {
+ warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
+ newdecl);
+ }
- /* Merge the type qualifiers. */
- if (TREE_CODE (olddecl) == FUNCTION_DECL
- && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
- && ! TREE_THIS_VOLATILE (newdecl))
- TREE_THIS_VOLATILE (write_olddecl) = 0;
+ /* Report location of previous decl/defn. */
+ if (warned || pedwarned)
+ locate_old_decl (olddecl);
- if (TREE_READONLY (newdecl))
- TREE_READONLY (write_olddecl) = 1;
+#undef DECL_EXTERN_INLINE
- if (TREE_THIS_VOLATILE (newdecl))
- {
- TREE_THIS_VOLATILE (write_olddecl) = 1;
- if (TREE_CODE (newdecl) == VAR_DECL
- /* If an automatic variable is re-declared in the same
- function scope, but the old declaration was not
- volatile, make_var_volatile() would crash because the
- variable would have been assigned to a pseudo, not a
- MEM. Since this duplicate declaration is invalid
- anyway, we just skip the call. */
- && errmsg == 0)
- make_var_volatile (newdecl);
- }
+ return retval;
+}
+
+/* Subroutine of duplicate_decls. NEWDECL has been found to be
+ consistent with OLDDECL, but carries new information. Merge the
+ new information into OLDDECL. This function issues no
+ diagnostics. */
+
+static void
+merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
+{
+ bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
+ && DECL_INITIAL (newdecl) != 0);
+ bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
+ && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
+ bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
+ && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
+ bool extern_changed = false;
+
+ /* For real parm decl following a forward decl, rechain the old decl
+ in its new location and clear TREE_ASM_WRITTEN (it's not a
+ forward decl anymore). */
+ if (TREE_CODE (newdecl) == PARM_DECL
+ && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
+ {
+ struct c_binding *b, **here;
+
+ for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
+ if ((*here)->decl == olddecl)
+ goto found;
+ gcc_unreachable ();
+
+ found:
+ b = *here;
+ *here = b->prev;
+ b->prev = current_scope->bindings;
+ current_scope->bindings = b;
+
+ TREE_ASM_WRITTEN (olddecl) = 0;
+ }
+
+ DECL_ATTRIBUTES (newdecl)
+ = targetm.merge_decl_attributes (olddecl, newdecl);
- /* Keep source location of definition rather than declaration. */
- /* When called with different_binding_level set, keep the old
- information so that meaningful diagnostics can be given. */
- if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
- && ! different_binding_level)
+ /* Merge the data types specified in the two decls. */
+ TREE_TYPE (newdecl)
+ = TREE_TYPE (olddecl)
+ = composite_type (newtype, oldtype);
+
+ /* Lay the type out, unless already done. */
+ if (!comptypes (oldtype, TREE_TYPE (newdecl)))
+ {
+ if (TREE_TYPE (newdecl) != error_mark_node)
+ layout_type (TREE_TYPE (newdecl));
+ if (TREE_CODE (newdecl) != FUNCTION_DECL
+ && TREE_CODE (newdecl) != TYPE_DECL
+ && TREE_CODE (newdecl) != CONST_DECL)
+ layout_decl (newdecl, 0);
+ }
+ else
+ {
+ /* Since the type is OLDDECL's, make OLDDECL's size go with. */
+ DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
+ DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
+ DECL_MODE (newdecl) = DECL_MODE (olddecl);
+ if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
{
- DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
- DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
+ DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
+ DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
}
+ }
- /* Merge the unused-warning information. */
- if (DECL_IN_SYSTEM_HEADER (olddecl))
- DECL_IN_SYSTEM_HEADER (newdecl) = 1;
- else if (DECL_IN_SYSTEM_HEADER (newdecl))
- DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
+ /* Keep the old rtl since we can safely use it. */
+ if (HAS_RTL_P (olddecl))
+ COPY_DECL_RTL (olddecl, newdecl);
- /* Merge the initialization information. */
- /* When called with different_binding_level set, don't copy over
- DECL_INITIAL, so that we don't accidentally change function
- declarations into function definitions. */
- if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
- DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
+ /* Merge the type qualifiers. */
+ if (TREE_READONLY (newdecl))
+ TREE_READONLY (olddecl) = 1;
+ if (TREE_THIS_VOLATILE (newdecl))
+ TREE_THIS_VOLATILE (olddecl) = 1;
+
+ /* Merge deprecatedness. */
+ if (TREE_DEPRECATED (newdecl))
+ TREE_DEPRECATED (olddecl) = 1;
+
+ /* If a decl is in a system header and the other isn't, keep the one on the
+ system header. Otherwise, keep source location of definition rather than
+ declaration and of prototype rather than non-prototype unless that
+ prototype is built-in. */
+ if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
+ && DECL_IN_SYSTEM_HEADER (olddecl)
+ && !DECL_IN_SYSTEM_HEADER (newdecl) )
+ DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
+ else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
+ && DECL_IN_SYSTEM_HEADER (newdecl)
+ && !DECL_IN_SYSTEM_HEADER (olddecl))
+ DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
+ else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
+ || (old_is_prototype && !new_is_prototype
+ && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
+ DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
+
+ /* Merge the initialization information. */
+ if (DECL_INITIAL (newdecl) == 0)
+ DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
+
+ /* Merge the threadprivate attribute. */
+ if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
+ {
+ DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
+ C_DECL_THREADPRIVATE_P (newdecl) = 1;
+ }
+
+ if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
+ {
/* Merge the section attribute.
- We want to issue an error if the sections conflict but that must be
- done later in decl_attributes since we are called before attributes
- are assigned. */
+ We want to issue an error if the sections conflict but that
+ must be done later in decl_attributes since we are called
+ before attributes are assigned. */
if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
Currently, it can only be defined in the prototype. */
COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
+ /* Use visibility of whichever declaration had it specified */
+ if (DECL_VISIBILITY_SPECIFIED (olddecl))
+ {
+ DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
+ DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
+ }
+
if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
|= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
+ TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
+ DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
+ DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
+ TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
+ DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
+ DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
}
- }
- /* If cannot merge, then use the new type and qualifiers,
- and don't preserve the old rtl. */
- else if (! different_binding_level)
- {
- TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
- TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
- TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
- TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
- }
- /* Merge the storage class information. */
- merge_weak (newdecl, olddecl);
+ /* Merge the storage class information. */
+ merge_weak (newdecl, olddecl);
- /* For functions, static overrides non-static. */
- if (TREE_CODE (newdecl) == FUNCTION_DECL)
- {
- TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
- /* This is since we don't automatically
- copy the attributes of NEWDECL into OLDDECL. */
- /* No need to worry about different_binding_level here because
- then TREE_PUBLIC (newdecl) was true. */
- TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
- /* If this clears `static', clear it in the identifier too. */
- if (! TREE_PUBLIC (olddecl))
- TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
+ /* For functions, static overrides non-static. */
+ if (TREE_CODE (newdecl) == FUNCTION_DECL)
+ {
+ TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
+ /* This is since we don't automatically
+ copy the attributes of NEWDECL into OLDDECL. */
+ TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
+ /* If this clears `static', clear it in the identifier too. */
+ if (!TREE_PUBLIC (olddecl))
+ TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
+ }
}
+
+ /* In c99, 'extern' declaration before (or after) 'inline' means this
+ function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
+ is present. */
+ if (TREE_CODE (newdecl) == FUNCTION_DECL
+ && !flag_gnu89_inline
+ && (DECL_DECLARED_INLINE_P (newdecl)
+ || DECL_DECLARED_INLINE_P (olddecl))
+ && (!DECL_DECLARED_INLINE_P (newdecl)
+ || !DECL_DECLARED_INLINE_P (olddecl)
+ || !DECL_EXTERNAL (olddecl))
+ && DECL_EXTERNAL (newdecl)
+ && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
+ && !current_function_decl)
+ DECL_EXTERNAL (newdecl) = 0;
+
if (DECL_EXTERNAL (newdecl))
{
- if (! different_binding_level)
- {
- /* Don't mess with these flags on local externs; they remain
- external even if there's a declaration at file scope which
- isn't. */
- TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
- DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
- }
+ TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
+ DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
+
/* An extern decl does not override previous storage class. */
TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
- if (! DECL_EXTERNAL (newdecl))
- DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
+ if (!DECL_EXTERNAL (newdecl))
+ {
+ DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
+ DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
+ }
}
else
{
{
/* If we're redefining a function previously defined as extern
inline, make sure we emit debug info for the inline before we
- throw it away, in case it was inlined into a function that hasn't
- been written out yet. */
+ throw it away, in case it was inlined into a function that
+ hasn't been written out yet. */
if (new_is_definition && DECL_INITIAL (olddecl))
- {
- if (TREE_USED (olddecl))
- (*debug_hooks->outlining_inline_function) (olddecl);
-
- /* The new defn must not be inline. */
- DECL_INLINE (newdecl) = 0;
- DECL_UNINLINABLE (newdecl) = 1;
- }
+ /* The new defn must not be inline. */
+ DECL_UNINLINABLE (newdecl) = 1;
else
{
- /* If either decl says `inline', this fn is inline,
- unless its definition was passed already. */
+ /* If either decl says `inline', this fn is inline, unless
+ its definition was passed already. */
if (DECL_DECLARED_INLINE_P (newdecl)
|| DECL_DECLARED_INLINE_P (olddecl))
DECL_DECLARED_INLINE_P (newdecl) = 1;
DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
= (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
+
+ DECL_DISREGARD_INLINE_LIMITS (newdecl)
+ = DECL_DISREGARD_INLINE_LIMITS (olddecl)
+ = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
+ || DECL_DISREGARD_INLINE_LIMITS (olddecl));
}
if (DECL_BUILT_IN (olddecl))
{
- /* Get rid of any built-in function if new arg types don't match it
- or if we have a function definition. */
- if (! types_match || new_is_definition)
- {
- if (! different_binding_level)
- {
- TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
- DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
- }
- }
+ /* If redeclaring a builtin function, it stays built in.
+ But it gets tagged as having been declared. */
+ DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
+ DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
+ C_DECL_DECLARED_BUILTIN (newdecl) = 1;
+ if (new_is_prototype)
+ C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
else
- {
- /* If redeclaring a builtin function, and not a definition,
- it stays built in. */
- DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
- DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
- }
+ C_DECL_BUILTIN_PROTOTYPE (newdecl)
+ = C_DECL_BUILTIN_PROTOTYPE (olddecl);
}
+ /* Preserve function specific target and optimization options */
+ if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
+ && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
+ DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
+ = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
+
+ if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
+ && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
+ DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
+ = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
+
/* Also preserve various other info from the definition. */
- if (! new_is_definition)
+ if (!new_is_definition)
{
DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
- /* When called with different_binding_level set, don't copy over
- DECL_INITIAL, so that we don't accidentally change function
- declarations into function definitions. */
- if (! different_binding_level)
- DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
- DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
+ DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
+ DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
- DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
+ gimple_set_body (newdecl, gimple_body (olddecl));
DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
- /* Set DECL_INLINE on the declaration if we've got a body
- from which to instantiate. */
- if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
- {
- DECL_INLINE (newdecl) = 1;
- DECL_ABSTRACT_ORIGIN (newdecl)
- = (different_binding_level
- ? DECL_ORIGIN (olddecl)
- : DECL_ABSTRACT_ORIGIN (olddecl));
- }
- }
- else
- {
- /* If a previous declaration said inline, mark the
- definition as inlinable. */
- if (DECL_DECLARED_INLINE_P (newdecl)
- && ! DECL_UNINLINABLE (newdecl))
- DECL_INLINE (newdecl) = 1;
+ /* See if we've got a function to instantiate from. */
+ if (DECL_SAVED_TREE (olddecl))
+ DECL_ABSTRACT_ORIGIN (newdecl)
+ = DECL_ABSTRACT_ORIGIN (olddecl);
}
}
- if (different_binding_level)
- return 0;
+
+ extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
+
+ /* Merge the USED information. */
+ if (TREE_USED (olddecl))
+ TREE_USED (newdecl) = 1;
+ else if (TREE_USED (newdecl))
+ TREE_USED (olddecl) = 1;
/* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
- But preserve OLDDECL's DECL_UID. */
+ But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
{
unsigned olddecl_uid = DECL_UID (olddecl);
+ tree olddecl_context = DECL_CONTEXT (olddecl);
memcpy ((char *) olddecl + sizeof (struct tree_common),
(char *) newdecl + sizeof (struct tree_common),
- sizeof (struct tree_decl) - sizeof (struct tree_common));
+ sizeof (struct tree_decl_common) - sizeof (struct tree_common));
+ switch (TREE_CODE (olddecl))
+ {
+ case FUNCTION_DECL:
+ gimple_set_body (olddecl, gimple_body (newdecl));
+ /* fall through */
+
+ case FIELD_DECL:
+ case VAR_DECL:
+ case PARM_DECL:
+ case LABEL_DECL:
+ case RESULT_DECL:
+ case CONST_DECL:
+ case TYPE_DECL:
+ memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
+ (char *) newdecl + sizeof (struct tree_decl_common),
+ tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
+ break;
+
+ default:
+
+ memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
+ (char *) newdecl + sizeof (struct tree_decl_common),
+ sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
+ }
DECL_UID (olddecl) = olddecl_uid;
+ DECL_CONTEXT (olddecl) = olddecl_context;
}
- /* NEWDECL contains the merged attribute lists.
- Update OLDDECL to be the same. */
- DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
-
- return 1;
+ /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
+ so that encode_section_info has a chance to look at the new decl
+ flags and attributes. */
+ if (DECL_RTL_SET_P (olddecl)
+ && (TREE_CODE (olddecl) == FUNCTION_DECL
+ || (TREE_CODE (olddecl) == VAR_DECL
+ && TREE_STATIC (olddecl))))
+ make_decl_rtl (olddecl);
+
+ /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
+ and the definition is coming from the old version, cgraph needs
+ to be called again. */
+ if (extern_changed && !new_is_definition
+ && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
+ cgraph_mark_if_needed (olddecl);
}
-/* Check whether decl-node X shadows an existing declaration.
- OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
- which might be a NULL_TREE. */
-static void
-warn_if_shadowing (x, oldlocal)
- tree x, oldlocal;
-{
- tree name;
+/* Handle when a new declaration NEWDECL has the same name as an old
+ one OLDDECL in the same binding contour. Prints an error message
+ if appropriate.
- if (DECL_EXTERNAL (x))
- return;
+ If safely possible, alter OLDDECL to look like NEWDECL, and return
+ true. Otherwise, return false. */
- name = DECL_NAME (x);
+static bool
+duplicate_decls (tree newdecl, tree olddecl)
+{
+ tree newtype = NULL, oldtype = NULL;
- /* Warn if shadowing an argument at the top level of the body. */
- if (oldlocal != 0
- /* This warning doesn't apply to the parms of a nested fcn. */
- && ! current_binding_level->parm_flag
- /* Check that this is one level down from the parms. */
- && current_binding_level->level_chain->parm_flag
- /* Check that the decl being shadowed
- comes from the parm level, one level up. */
- && chain_member (oldlocal, current_binding_level->level_chain->names))
- {
- if (TREE_CODE (oldlocal) == PARM_DECL)
- pedwarn ("declaration of `%s' shadows a parameter",
- IDENTIFIER_POINTER (name));
- else
- pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
- IDENTIFIER_POINTER (name));
- }
- /* Maybe warn if shadowing something else. */
- else if (warn_shadow
- /* No shadow warnings for internally generated vars. */
- && DECL_SOURCE_LINE (x) != 0
- /* No shadow warnings for vars made for inlining. */
- && ! DECL_FROM_INLINE (x))
- {
- if (TREE_CODE (x) == PARM_DECL
- && current_binding_level->level_chain->parm_flag)
- /* Don't warn about the parm names in function declarator
- within a function declarator.
- It would be nice to avoid warning in any function
- declarator in a declaration, as opposed to a definition,
- but there is no way to tell it's not a definition. */
- ;
- else if (oldlocal)
- {
- if (TREE_CODE (oldlocal) == PARM_DECL)
- shadow_warning ("a parameter", name, oldlocal);
- else
- shadow_warning ("a previous local", name, oldlocal);
- }
- else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
- && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
- shadow_warning ("a global declaration", name,
- IDENTIFIER_GLOBAL_VALUE (name));
+ if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
+ {
+ /* Avoid `unused variable' and other warnings for OLDDECL. */
+ TREE_NO_WARNING (olddecl) = 1;
+ return false;
}
+
+ merge_decls (newdecl, olddecl, newtype, oldtype);
+ return true;
}
-/* Record a decl-node X as belonging to the current lexical scope.
- Check for errors (such as an incompatible declaration for the same
- name already seen in the same scope).
+\f
+/* Check whether decl-node NEW_DECL shadows an existing declaration. */
+static void
+warn_if_shadowing (tree new_decl)
+{
+ struct c_binding *b;
+
+ /* Shadow warnings wanted? */
+ if (!warn_shadow
+ /* No shadow warnings for internally generated vars. */
+ || DECL_IS_BUILTIN (new_decl)
+ /* No shadow warnings for vars made for inlining. */
+ || DECL_FROM_INLINE (new_decl))
+ return;
- Returns either X or an old decl for the same name.
- If an old decl is returned, it may have been smashed
- to agree with what X says. */
+ /* Is anything being shadowed? Invisible decls do not count. */
+ for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
+ if (b->decl && b->decl != new_decl && !b->invisible)
+ {
+ tree old_decl = b->decl;
-tree
-pushdecl (x)
- tree x;
-{
- tree t;
- tree name = DECL_NAME (x);
- struct binding_level *b = current_binding_level;
-
- /* Functions need the lang_decl data. */
- if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
- DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
- ggc_alloc_cleared (sizeof (struct lang_decl));
-
- DECL_CONTEXT (x) = current_function_decl;
- /* A local extern declaration for a function doesn't constitute nesting.
- A local auto declaration does, since it's a forward decl
- for a nested function coming later. */
- if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
- && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
- DECL_CONTEXT (x) = 0;
-
- if (name)
- {
- int different_binding_level = 0;
-
- if (warn_nested_externs
- && DECL_EXTERNAL (x)
- && b != global_binding_level
- && x != IDENTIFIER_IMPLICIT_DECL (name)
- /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
- && !DECL_IN_SYSTEM_HEADER (x))
- warning ("nested extern declaration of `%s'",
- IDENTIFIER_POINTER (name));
-
- t = lookup_name_current_level (name);
- /* Don't type check externs here when -traditional. This is so that
- code with conflicting declarations inside blocks will get warnings
- not errors. X11 for instance depends on this. */
- if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
- {
- t = IDENTIFIER_GLOBAL_VALUE (name);
- /* Type decls at global scope don't conflict with externs declared
- inside lexical blocks. */
- if (! t || TREE_CODE (t) == TYPE_DECL)
- /* If there's no visible global declaration, try for an
- invisible one. */
- t = IDENTIFIER_LIMBO_VALUE (name);
- different_binding_level = 1;
- }
- if (t != 0 && t == error_mark_node)
- /* error_mark_node is 0 for a while during initialization! */
- {
- t = 0;
- error_with_decl (x, "`%s' used prior to declaration");
- }
+ if (old_decl == error_mark_node)
+ {
+ warning (OPT_Wshadow, "declaration of %q+D shadows previous "
+ "non-variable", new_decl);
+ break;
+ }
+ else if (TREE_CODE (old_decl) == PARM_DECL)
+ warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
+ new_decl);
+ else if (DECL_FILE_SCOPE_P (old_decl))
+ warning (OPT_Wshadow, "declaration of %q+D shadows a global "
+ "declaration", new_decl);
+ else if (TREE_CODE (old_decl) == FUNCTION_DECL
+ && DECL_BUILT_IN (old_decl))
+ {
+ warning (OPT_Wshadow, "declaration of %q+D shadows "
+ "a built-in function", new_decl);
+ break;
+ }
+ else
+ warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
+ new_decl);
- /* If this decl is `static' and an implicit decl was seen previously,
- warn. But don't complain if -traditional,
- since traditional compilers don't complain. */
- if (! flag_traditional && TREE_PUBLIC (name)
- /* Don't test for DECL_EXTERNAL, because grokdeclarator
- sets this for all functions. */
- && ! TREE_PUBLIC (x)
- && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
- /* We used to warn also for explicit extern followed by static,
- but sometimes you need to do it that way. */
- && IDENTIFIER_IMPLICIT_DECL (name) != 0)
- {
- pedwarn ("`%s' was declared implicitly `extern' and later `static'",
- IDENTIFIER_POINTER (name));
- pedwarn_with_file_and_line
- (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
- DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
- "previous declaration of `%s'",
- IDENTIFIER_POINTER (name));
- TREE_THIS_VOLATILE (name) = 1;
- }
+ warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
- if (t != 0 && duplicate_decls (x, t, different_binding_level))
- {
- if (TREE_CODE (t) == PARM_DECL)
- {
- /* Don't allow more than one "real" duplicate
- of a forward parm decl. */
- TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
- return t;
- }
- return t;
- }
+ break;
+ }
+}
- /* If we are processing a typedef statement, generate a whole new
- ..._TYPE node (which will be just an variant of the existing
- ..._TYPE node with identical properties) and then install the
- TYPE_DECL node generated to represent the typedef name as the
- TYPE_NAME of this brand new (duplicate) ..._TYPE node.
-
- The whole point here is to end up with a situation where each
- and every ..._TYPE node the compiler creates will be uniquely
- associated with AT MOST one node representing a typedef name.
- This way, even though the compiler substitutes corresponding
- ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
- early on, later parts of the compiler can always do the reverse
- translation and get back the corresponding typedef name. For
- example, given:
-
- typedef struct S MY_TYPE;
- MY_TYPE object;
- Later parts of the compiler might only know that `object' was of
- type `struct S' if it were not for code just below. With this
- code however, later parts of the compiler see something like:
+/* Subroutine of pushdecl.
+
+ X is a TYPE_DECL for a typedef statement. Create a brand new
+ ..._TYPE node (which will be just a variant of the existing
+ ..._TYPE node with identical properties) and then install X
+ as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
- struct S' == struct S
- typedef struct S' MY_TYPE;
- struct S' object;
+ The whole point here is to end up with a situation where each
+ and every ..._TYPE node the compiler creates will be uniquely
+ associated with AT MOST one node representing a typedef name.
+ This way, even though the compiler substitutes corresponding
+ ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
+ early on, later parts of the compiler can always do the reverse
+ translation and get back the corresponding typedef name. For
+ example, given:
- And they can then deduce (from the node for type struct S') that
- the original object declaration was:
+ typedef struct S MY_TYPE;
+ MY_TYPE object;
+
+ Later parts of the compiler might only know that `object' was of
+ type `struct S' if it were not for code just below. With this
+ code however, later parts of the compiler see something like:
+
+ struct S' == struct S
+ typedef struct S' MY_TYPE;
+ struct S' object;
+
+ And they can then deduce (from the node for type struct S') that
+ the original object declaration was:
MY_TYPE object;
- Being able to do this is important for proper support of protoize,
- and also for generating precise symbolic debugging information
- which takes full account of the programmer's (typedef) vocabulary.
+ Being able to do this is important for proper support of protoize,
+ and also for generating precise symbolic debugging information
+ which takes full account of the programmer's (typedef) vocabulary.
+
+ Obviously, we don't want to generate a duplicate ..._TYPE node if
+ the TYPE_DECL node that we are now processing really represents a
+ standard built-in type. */
+
+static void
+clone_underlying_type (tree x)
+{
+ if (DECL_IS_BUILTIN (x))
+ {
+ if (TYPE_NAME (TREE_TYPE (x)) == 0)
+ TYPE_NAME (TREE_TYPE (x)) = x;
+ }
+ else if (TREE_TYPE (x) != error_mark_node
+ && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
+ {
+ tree tt = TREE_TYPE (x);
+ DECL_ORIGINAL_TYPE (x) = tt;
+ tt = build_variant_type_copy (tt);
+ TYPE_NAME (tt) = x;
+ TREE_USED (tt) = TREE_USED (x);
+ TREE_TYPE (x) = tt;
+ }
+}
- Obviously, we don't want to generate a duplicate ..._TYPE node if
- the TYPE_DECL node that we are now processing really represents a
- standard built-in type.
+/* Record a decl-node X as belonging to the current lexical scope.
+ Check for errors (such as an incompatible declaration for the same
+ name already seen in the same scope).
- Since all standard types are effectively declared at line zero
- in the source file, we can easily check to see if we are working
- on a standard type by checking the current value of lineno. */
+ Returns either X or an old decl for the same name.
+ If an old decl is returned, it may have been smashed
+ to agree with what X says. */
- if (TREE_CODE (x) == TYPE_DECL)
+tree
+pushdecl (tree x)
+{
+ tree name = DECL_NAME (x);
+ struct c_scope *scope = current_scope;
+ struct c_binding *b;
+ bool nested = false;
+
+ /* Must set DECL_CONTEXT for everything not at file scope or
+ DECL_FILE_SCOPE_P won't work. Local externs don't count
+ unless they have initializers (which generate code). */
+ if (current_function_decl
+ && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
+ || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
+ DECL_CONTEXT (x) = current_function_decl;
+
+ /* If this is of variably modified type, prevent jumping into its
+ scope. */
+ if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
+ && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
+ c_begin_vm_scope (scope->depth);
+
+ /* Anonymous decls are just inserted in the scope. */
+ if (!name)
+ {
+ bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
+ return x;
+ }
+
+ /* First, see if there is another declaration with the same name in
+ the current scope. If there is, duplicate_decls may do all the
+ work for us. If duplicate_decls returns false, that indicates
+ two incompatible decls in the same scope; we are to silently
+ replace the old one (duplicate_decls has issued all appropriate
+ diagnostics). In particular, we should not consider possible
+ duplicates in the external scope, or shadowing. */
+ b = I_SYMBOL_BINDING (name);
+ if (b && B_IN_SCOPE (b, scope))
+ {
+ struct c_binding *b_ext, *b_use;
+ tree type = TREE_TYPE (x);
+ tree visdecl = b->decl;
+ tree vistype = TREE_TYPE (visdecl);
+ if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
+ && COMPLETE_TYPE_P (TREE_TYPE (x)))
+ b->inner_comp = false;
+ b_use = b;
+ b_ext = b;
+ /* If this is an external linkage declaration, we should check
+ for compatibility with the type in the external scope before
+ setting the type at this scope based on the visible
+ information only. */
+ if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
{
- if (DECL_SOURCE_LINE (x) == 0)
- {
- if (TYPE_NAME (TREE_TYPE (x)) == 0)
- TYPE_NAME (TREE_TYPE (x)) = x;
- }
- else if (TREE_TYPE (x) != error_mark_node
- && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
+ while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
+ b_ext = b_ext->shadowed;
+ if (b_ext)
{
- tree tt = TREE_TYPE (x);
- DECL_ORIGINAL_TYPE (x) = tt;
- tt = build_type_copy (tt);
- TYPE_NAME (tt) = x;
- TREE_USED (tt) = TREE_USED (x);
- TREE_TYPE (x) = tt;
+ b_use = b_ext;
+ if (b_use->type)
+ TREE_TYPE (b_use->decl) = b_use->type;
}
}
-
- /* Multiple external decls of the same identifier ought to match.
- Check against both global declarations (when traditional) and out of
- scope (limbo) block level declarations.
-
- We get warnings about inline functions where they are defined.
- Avoid duplicate warnings where they are used. */
- if (TREE_PUBLIC (x)
- && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
+ if (duplicate_decls (x, b_use->decl))
{
- tree decl;
-
- if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
- && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
- || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
- decl = IDENTIFIER_GLOBAL_VALUE (name);
- else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
- /* Decls in limbo are always extern, so no need to check that. */
- decl = IDENTIFIER_LIMBO_VALUE (name);
- else
- decl = 0;
-
- if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
- /* If old decl is built-in, we already warned if we should. */
- && !DECL_BUILT_IN (decl))
+ if (b_use != b)
{
- pedwarn_with_decl (x,
- "type mismatch with previous external decl");
- pedwarn_with_decl (decl, "previous external decl of `%s'");
+ /* Save the updated type in the external scope and
+ restore the proper type for this scope. */
+ tree thistype;
+ if (comptypes (vistype, type))
+ thistype = composite_type (vistype, type);
+ else
+ thistype = TREE_TYPE (b_use->decl);
+ b_use->type = TREE_TYPE (b_use->decl);
+ if (TREE_CODE (b_use->decl) == FUNCTION_DECL
+ && DECL_BUILT_IN (b_use->decl))
+ thistype
+ = build_type_attribute_variant (thistype,
+ TYPE_ATTRIBUTES
+ (b_use->type));
+ TREE_TYPE (b_use->decl) = thistype;
}
+ return b_use->decl;
}
-
- /* If a function has had an implicit declaration, and then is defined,
- make sure they are compatible. */
-
- if (IDENTIFIER_IMPLICIT_DECL (name) != 0
- && IDENTIFIER_GLOBAL_VALUE (name) == 0
- && TREE_CODE (x) == FUNCTION_DECL
- && ! comptypes (TREE_TYPE (x),
- TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
+ else
+ goto skip_external_and_shadow_checks;
+ }
+
+ /* All declarations with external linkage, and all external
+ references, go in the external scope, no matter what scope is
+ current. However, the binding in that scope is ignored for
+ purposes of normal name lookup. A separate binding structure is
+ created in the requested scope; this governs the normal
+ visibility of the symbol.
+
+ The binding in the externals scope is used exclusively for
+ detecting duplicate declarations of the same object, no matter
+ what scope they are in; this is what we do here. (C99 6.2.7p2:
+ All declarations that refer to the same object or function shall
+ have compatible type; otherwise, the behavior is undefined.) */
+ if (DECL_EXTERNAL (x) || scope == file_scope)
+ {
+ tree type = TREE_TYPE (x);
+ tree vistype = 0;
+ tree visdecl = 0;
+ bool type_saved = false;
+ if (b && !B_IN_EXTERNAL_SCOPE (b)
+ && (TREE_CODE (b->decl) == FUNCTION_DECL
+ || TREE_CODE (b->decl) == VAR_DECL)
+ && DECL_FILE_SCOPE_P (b->decl))
{
- warning_with_decl (x, "type mismatch with previous implicit declaration");
- warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
- "previous implicit declaration of `%s'");
+ visdecl = b->decl;
+ vistype = TREE_TYPE (visdecl);
}
+ if (scope != file_scope
+ && !DECL_IN_SYSTEM_HEADER (x))
+ warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
- /* In PCC-compatibility mode, extern decls of vars with no current decl
- take effect at top level no matter where they are. */
- if (flag_traditional && DECL_EXTERNAL (x)
- && lookup_name (name) == 0)
+ while (b && !B_IN_EXTERNAL_SCOPE (b))
{
- tree type = TREE_TYPE (x);
-
- /* But don't do this if the type contains temporary nodes. */
- while (type)
+ /* If this decl might be modified, save its type. This is
+ done here rather than when the decl is first bound
+ because the type may change after first binding, through
+ being completed or through attributes being added. If we
+ encounter multiple such decls, only the first should have
+ its type saved; the others will already have had their
+ proper types saved and the types will not have changed as
+ their scopes will not have been re-entered. */
+ if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
{
- if (type == error_mark_node)
- break;
- if (TYPE_CONTEXT (type))
- {
- warning_with_decl (x, "type of external `%s' is not global");
- /* By exiting the loop early, we leave TYPE nonzero,
- and thus prevent globalization of the decl. */
- break;
- }
- else if (TREE_CODE (type) == FUNCTION_TYPE
- && TYPE_ARG_TYPES (type) != 0)
- /* The types might not be truly local,
- but the list of arg types certainly is temporary.
- Since prototypes are nontraditional,
- ok not to do the traditional thing. */
- break;
- type = TREE_TYPE (type);
+ b->type = TREE_TYPE (b->decl);
+ type_saved = true;
}
-
- if (type == 0)
- b = global_binding_level;
+ if (B_IN_FILE_SCOPE (b)
+ && TREE_CODE (b->decl) == VAR_DECL
+ && TREE_STATIC (b->decl)
+ && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
+ && !TYPE_DOMAIN (TREE_TYPE (b->decl))
+ && TREE_CODE (type) == ARRAY_TYPE
+ && TYPE_DOMAIN (type)
+ && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
+ && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
+ {
+ /* Array type completed in inner scope, which should be
+ diagnosed if the completion does not have size 1 and
+ it does not get completed in the file scope. */
+ b->inner_comp = true;
+ }
+ b = b->shadowed;
}
- /* This name is new in its binding level.
- Install the new declaration and return it. */
- if (b == global_binding_level)
+ /* If a matching external declaration has been found, set its
+ type to the composite of all the types of that declaration.
+ After the consistency checks, it will be reset to the
+ composite of the visible types only. */
+ if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
+ && b->type)
+ TREE_TYPE (b->decl) = b->type;
+
+ /* The point of the same_translation_unit_p check here is,
+ we want to detect a duplicate decl for a construct like
+ foo() { extern bar(); } ... static bar(); but not if
+ they are in different translation units. In any case,
+ the static does not go in the externals scope. */
+ if (b
+ && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
+ && duplicate_decls (x, b->decl))
{
- /* Install a global value. */
-
- /* If the first global decl has external linkage,
- warn if we later see static one. */
- if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
- TREE_PUBLIC (name) = 1;
-
- IDENTIFIER_GLOBAL_VALUE (name) = x;
-
- /* We no longer care about any previous block level declarations. */
- IDENTIFIER_LIMBO_VALUE (name) = 0;
-
- /* Don't forget if the function was used via an implicit decl. */
- if (IDENTIFIER_IMPLICIT_DECL (name)
- && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
- TREE_USED (x) = 1, TREE_USED (name) = 1;
-
- /* Don't forget if its address was taken in that way. */
- if (IDENTIFIER_IMPLICIT_DECL (name)
- && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
- TREE_ADDRESSABLE (x) = 1;
-
- /* Warn about mismatches against previous implicit decl. */
- if (IDENTIFIER_IMPLICIT_DECL (name) != 0
- /* If this real decl matches the implicit, don't complain. */
- && ! (TREE_CODE (x) == FUNCTION_DECL
- && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
- == integer_type_node)))
- pedwarn ("`%s' was previously implicitly declared to return `int'",
- IDENTIFIER_POINTER (name));
-
- /* If this decl is `static' and an `extern' was seen previously,
- that is erroneous. */
- if (TREE_PUBLIC (name)
- && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
+ tree thistype;
+ if (vistype)
{
- /* Okay to redeclare an ANSI built-in as static. */
- if (t != 0 && DECL_BUILT_IN (t))
- ;
- /* Okay to declare a non-ANSI built-in as anything. */
- else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
- ;
- /* Okay to have global type decl after an earlier extern
- declaration inside a lexical block. */
- else if (TREE_CODE (x) == TYPE_DECL)
- ;
- else if (IDENTIFIER_IMPLICIT_DECL (name))
- {
- if (! TREE_THIS_VOLATILE (name))
- pedwarn ("`%s' was declared implicitly `extern' and later `static'",
- IDENTIFIER_POINTER (name));
- }
+ if (comptypes (vistype, type))
+ thistype = composite_type (vistype, type);
else
- pedwarn ("`%s' was declared `extern' and later `static'",
- IDENTIFIER_POINTER (name));
+ thistype = TREE_TYPE (b->decl);
}
+ else
+ thistype = type;
+ b->type = TREE_TYPE (b->decl);
+ if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
+ thistype
+ = build_type_attribute_variant (thistype,
+ TYPE_ATTRIBUTES (b->type));
+ TREE_TYPE (b->decl) = thistype;
+ bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
+ return b->decl;
}
- else
+ else if (TREE_PUBLIC (x))
{
- /* Here to install a non-global value. */
- tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
- tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
-
- IDENTIFIER_LOCAL_VALUE (name) = x;
-
- /* If this is an extern function declaration, see if we
- have a global definition or declaration for the function. */
- if (oldlocal == 0
- && oldglobal != 0
- && TREE_CODE (x) == FUNCTION_DECL
- && TREE_CODE (oldglobal) == FUNCTION_DECL
- && DECL_EXTERNAL (x)
- && ! DECL_DECLARED_INLINE_P (x))
+ if (visdecl && !b && duplicate_decls (x, visdecl))
{
- /* We have one. Their types must agree. */
- if (! comptypes (TREE_TYPE (x),
- TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
- pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
- else
- {
- /* Inner extern decl is inline if global one is.
- Copy enough to really inline it. */
- if (DECL_DECLARED_INLINE_P (oldglobal))
- {
- DECL_DECLARED_INLINE_P (x)
- = DECL_DECLARED_INLINE_P (oldglobal);
- DECL_INLINE (x) = DECL_INLINE (oldglobal);
- DECL_INITIAL (x) = (current_function_decl == oldglobal
- ? 0 : DECL_INITIAL (oldglobal));
- DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
- DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
- DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
- DECL_RESULT (x) = DECL_RESULT (oldglobal);
- TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
- DECL_ABSTRACT_ORIGIN (x)
- = DECL_ABSTRACT_ORIGIN (oldglobal);
- }
- /* Inner extern decl is built-in if global one is. */
- if (DECL_BUILT_IN (oldglobal))
- {
- DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
- DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
- }
- /* Keep the arg types from a file-scope fcn defn. */
- if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
- && DECL_INITIAL (oldglobal)
- && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
- TREE_TYPE (x) = TREE_TYPE (oldglobal);
- }
+ /* An external declaration at block scope referring to a
+ visible entity with internal linkage. The composite
+ type will already be correct for this scope, so we
+ just need to fall through to make the declaration in
+ this scope. */
+ nested = true;
+ x = visdecl;
}
-
-#if 0
- /* This case is probably sometimes the right thing to do. */
- /* If we have a local external declaration,
- then any file-scope declaration should not
- have been static. */
- if (oldlocal == 0 && oldglobal != 0
- && !TREE_PUBLIC (oldglobal)
- && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
- warning ("`%s' locally external but globally static",
- IDENTIFIER_POINTER (name));
-#endif
-
- /* If we have a local external declaration,
- and no file-scope declaration has yet been seen,
- then if we later have a file-scope decl it must not be static. */
- if (oldlocal == 0
- && DECL_EXTERNAL (x)
- && TREE_PUBLIC (x))
+ else
{
- if (oldglobal == 0)
- TREE_PUBLIC (name) = 1;
-
- /* Save this decl, so that we can do type checking against
- other decls after it falls out of scope.
-
- Only save it once. This prevents temporary decls created in
- expand_inline_function from being used here, since this
- will have been set when the inline function was parsed.
- It also helps give slightly better warnings. */
- if (IDENTIFIER_LIMBO_VALUE (name) == 0)
- IDENTIFIER_LIMBO_VALUE (name) = x;
+ bind (name, x, external_scope, /*invisible=*/true,
+ /*nested=*/false);
+ nested = true;
}
+ }
+ }
- warn_if_shadowing (x, oldlocal);
+ if (TREE_CODE (x) != PARM_DECL)
+ warn_if_shadowing (x);
- /* If storing a local value, there may already be one (inherited).
- If so, record it for restoration when this binding level ends. */
- if (oldlocal != 0)
- b->shadowed = tree_cons (name, oldlocal, b->shadowed);
- }
+ skip_external_and_shadow_checks:
+ if (TREE_CODE (x) == TYPE_DECL)
+ clone_underlying_type (x);
- /* Keep count of variables in this level with incomplete type.
- If the input is erroneous, we can have error_mark in the type
- slot (e.g. "f(void a, ...)") - that doesn't count as an
- incomplete type. */
- if (TREE_TYPE (x) != error_mark_node
- && !COMPLETE_TYPE_P (TREE_TYPE (x)))
- {
- tree element = TREE_TYPE (x);
+ bind (name, x, scope, /*invisible=*/false, nested);
- while (TREE_CODE (element) == ARRAY_TYPE)
- element = TREE_TYPE (element);
- if (TREE_CODE (element) == RECORD_TYPE
- || TREE_CODE (element) == UNION_TYPE)
- ++b->n_incomplete;
- }
- }
+ /* If x's type is incomplete because it's based on a
+ structure or union which has not yet been fully declared,
+ attach it to that structure or union type, so we can go
+ back and complete the variable declaration later, if the
+ structure or union gets fully declared.
+
+ If the input is erroneous, we can have error_mark in the type
+ slot (e.g. "f(void a, ...)") - that doesn't count as an
+ incomplete type. */
+ if (TREE_TYPE (x) != error_mark_node
+ && !COMPLETE_TYPE_P (TREE_TYPE (x)))
+ {
+ tree element = TREE_TYPE (x);
- /* Put decls on list in reverse order.
- We will reverse them later if necessary. */
- TREE_CHAIN (x) = b->names;
- b->names = x;
+ while (TREE_CODE (element) == ARRAY_TYPE)
+ element = TREE_TYPE (element);
+ element = TYPE_MAIN_VARIANT (element);
+ if ((TREE_CODE (element) == RECORD_TYPE
+ || TREE_CODE (element) == UNION_TYPE)
+ && (TREE_CODE (x) != TYPE_DECL
+ || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
+ && !COMPLETE_TYPE_P (element))
+ C_TYPE_INCOMPLETE_VARS (element)
+ = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
+ }
return x;
}
-/* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
+/* Record X as belonging to file scope.
+ This is used only internally by the Objective-C front end,
+ and is limited to its needs. duplicate_decls is not called;
+ if there is any preexisting decl for this identifier, it is an ICE. */
tree
-pushdecl_top_level (x)
- tree x;
+pushdecl_top_level (tree x)
{
- tree t;
- struct binding_level *b = current_binding_level;
+ tree name;
+ bool nested = false;
+ gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
- current_binding_level = global_binding_level;
- t = pushdecl (x);
- current_binding_level = b;
- return t;
+ name = DECL_NAME (x);
+
+ gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
+
+ if (TREE_PUBLIC (x))
+ {
+ bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
+ nested = true;
+ }
+ if (file_scope)
+ bind (name, x, file_scope, /*invisible=*/false, nested);
+
+ return x;
}
\f
-/* Generate an implicit declaration for identifier FUNCTIONID
- as a function of type int (). Print a warning if appropriate. */
-
-tree
-implicitly_declare (functionid)
- tree functionid;
+static void
+implicit_decl_warning (tree id, tree olddecl)
{
- tree decl;
- int traditional_warning = 0;
- /* Only one "implicit declaration" warning per identifier. */
- int implicit_warning;
-
- /* We used to reuse an old implicit decl here,
- but this loses with inline functions because it can clobber
- the saved decl chains. */
-#if 0
- if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
- decl = IDENTIFIER_IMPLICIT_DECL (functionid);
- else
-#endif
- decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
+ if (warn_implicit_function_declaration)
+ {
+ bool warned;
- /* Warn of implicit decl following explicit local extern decl.
- This is probably a program designed for traditional C. */
- if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
- traditional_warning = 1;
+ if (flag_isoc99)
+ warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
+ "implicit declaration of function %qE", id);
+ else
+ warned = warning (OPT_Wimplicit_function_declaration,
+ G_("implicit declaration of function %qE"), id);
+ if (olddecl && warned)
+ locate_old_decl (olddecl);
+ }
+}
- /* Warn once of an implicit declaration. */
- implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
+/* Generate an implicit declaration for identifier FUNCTIONID as a
+ function of type int (). */
- DECL_EXTERNAL (decl) = 1;
- TREE_PUBLIC (decl) = 1;
+tree
+implicitly_declare (tree functionid)
+{
+ struct c_binding *b;
+ tree decl = 0;
+ tree asmspec_tree;
- /* Record that we have an implicit decl and this is it. */
- IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
+ for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
+ {
+ if (B_IN_SCOPE (b, external_scope))
+ {
+ decl = b->decl;
+ break;
+ }
+ }
- /* ANSI standard says implicit declarations are in the innermost block.
- So we record the decl in the standard fashion.
- If flag_traditional is set, pushdecl does it top-level. */
- pushdecl (decl);
+ if (decl)
+ {
+ if (decl == error_mark_node)
+ return decl;
- /* This is a no-op in c-lang.c or something real in objc-actions.c. */
- maybe_objc_check_decl (decl);
+ /* FIXME: Objective-C has weird not-really-builtin functions
+ which are supposed to be visible automatically. They wind up
+ in the external scope because they're pushed before the file
+ scope gets created. Catch this here and rebind them into the
+ file scope. */
+ if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
+ {
+ bind (functionid, decl, file_scope,
+ /*invisible=*/false, /*nested=*/true);
+ return decl;
+ }
+ else
+ {
+ tree newtype = default_function_type;
+ if (b->type)
+ TREE_TYPE (decl) = b->type;
+ /* Implicit declaration of a function already declared
+ (somehow) in a different scope, or as a built-in.
+ If this is the first time this has happened, warn;
+ then recycle the old declaration but with the new type. */
+ if (!C_DECL_IMPLICIT (decl))
+ {
+ implicit_decl_warning (functionid, decl);
+ C_DECL_IMPLICIT (decl) = 1;
+ }
+ if (DECL_BUILT_IN (decl))
+ {
+ newtype = build_type_attribute_variant (newtype,
+ TYPE_ATTRIBUTES
+ (TREE_TYPE (decl)));
+ if (!comptypes (newtype, TREE_TYPE (decl)))
+ {
+ warning (0, "incompatible implicit declaration of built-in"
+ " function %qD", decl);
+ newtype = TREE_TYPE (decl);
+ }
+ }
+ else
+ {
+ if (!comptypes (newtype, TREE_TYPE (decl)))
+ {
+ error ("incompatible implicit declaration of function %qD",
+ decl);
+ locate_old_decl (decl);
+ }
+ }
+ b->type = TREE_TYPE (decl);
+ TREE_TYPE (decl) = newtype;
+ bind (functionid, decl, current_scope,
+ /*invisible=*/false, /*nested=*/true);
+ return decl;
+ }
+ }
- rest_of_decl_compilation (decl, NULL, 0, 0);
+ /* Not seen before. */
+ decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
+ DECL_EXTERNAL (decl) = 1;
+ TREE_PUBLIC (decl) = 1;
+ C_DECL_IMPLICIT (decl) = 1;
+ implicit_decl_warning (functionid, 0);
+ asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
+ if (asmspec_tree)
+ set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
- if (implicit_warning)
- implicit_decl_warning (functionid);
- else if (warn_traditional && traditional_warning)
- warning ("function `%s' was previously declared within a block",
- IDENTIFIER_POINTER (functionid));
+ /* C89 says implicit declarations are in the innermost block.
+ So we record the decl in the standard fashion. */
+ decl = pushdecl (decl);
- /* Write a record describing this implicit function declaration to the
- prototypes file (if requested). */
+ /* No need to call objc_check_decl here - it's a function type. */
+ rest_of_decl_compilation (decl, 0, 0);
+ /* Write a record describing this implicit function declaration
+ to the prototypes file (if requested). */
gen_aux_info_record (decl, 0, 1, 0);
/* Possibly apply some default attributes to this implicit declaration. */
return decl;
}
+/* Issue an error message for a reference to an undeclared variable
+ ID, including a reference to a builtin outside of function-call
+ context. Establish a binding of the identifier to error_mark_node
+ in an appropriate scope, which will suppress further errors for the
+ same identifier. The error message should be given location LOC. */
void
-implicit_decl_warning (id)
- tree id;
+undeclared_variable (tree id, location_t loc)
{
- const char *name = IDENTIFIER_POINTER (id);
- if (mesg_implicit_function_declaration == 2)
- error ("implicit declaration of function `%s'", name);
- else if (mesg_implicit_function_declaration == 1)
- warning ("implicit declaration of function `%s'", name);
-}
-
-/* Return zero if the declaration NEWDECL is valid
- when the declaration OLDDECL (assumed to be for the same name)
- has already been seen.
- Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
- and 3 if it is a conflicting declaration. */
+ static bool already = false;
+ struct c_scope *scope;
-static int
-redeclaration_error_message (newdecl, olddecl)
- tree newdecl, olddecl;
-{
- if (TREE_CODE (newdecl) == TYPE_DECL)
- {
- if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
- return 0;
- /* pushdecl creates distinct types for TYPE_DECLs by calling
- build_type_copy, so the above comparison generally fails. We do
- another test against the TYPE_MAIN_VARIANT of the olddecl, which
- is equivalent to what this code used to do before the build_type_copy
- call. The variant type distinction should not matter for traditional
- code, because it doesn't have type qualifiers. */
- if (flag_traditional
- && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
- return 0;
- if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
- return 0;
- return 1;
- }
- else if (TREE_CODE (newdecl) == FUNCTION_DECL)
- {
- /* Declarations of functions can insist on internal linkage
- but they can't be inconsistent with internal linkage,
- so there can be no error on that account.
- However defining the same name twice is no good. */
- if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
- /* However, defining once as extern inline and a second
- time in another way is ok. */
- && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
- && ! (DECL_DECLARED_INLINE_P (newdecl)
- && DECL_EXTERNAL (newdecl))))
- return 1;
- return 0;
- }
- else if (DECL_CONTEXT (newdecl) == NULL_TREE)
+ if (current_function_decl == 0)
{
- /* Objects declared at top level: */
- /* If at least one is a reference, it's ok. */
- if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
- return 0;
- /* Reject two definitions. */
- if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
- return 1;
- /* Now we have two tentative defs, or one tentative and one real def. */
- /* Insist that the linkage match. */
- if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
- return 3;
- return 0;
+ error ("%H%qE undeclared here (not in a function)", &loc, id);
+ scope = current_scope;
}
- else if (current_binding_level->parm_flag
- && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
- return 0;
else
{
- /* Newdecl has block scope. If olddecl has block scope also, then
- reject two definitions, and reject a definition together with an
- external reference. Otherwise, it is OK, because newdecl must
- be an extern reference to olddecl. */
- if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
- && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
- return 2;
- return 0;
+ error ("%H%qE undeclared (first use in this function)", &loc, id);
+
+ if (!already)
+ {
+ error ("%H(Each undeclared identifier is reported only once", &loc);
+ error ("%Hfor each function it appears in.)", &loc);
+ already = true;
+ }
+
+ /* If we are parsing old-style parameter decls, current_function_decl
+ will be nonnull but current_function_scope will be null. */
+ scope = current_function_scope ? current_function_scope : current_scope;
}
+ bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
}
\f
-/* Get the LABEL_DECL corresponding to identifier ID as a label.
+/* Subroutine of lookup_label, declare_label, define_label: construct a
+ LABEL_DECL with all the proper frills. */
+
+static tree
+make_label (tree name, location_t location)
+{
+ tree label = build_decl (LABEL_DECL, name, void_type_node);
+
+ DECL_CONTEXT (label) = current_function_decl;
+ DECL_MODE (label) = VOIDmode;
+ DECL_SOURCE_LOCATION (label) = location;
+
+ return label;
+}
+
+/* Get the LABEL_DECL corresponding to identifier NAME as a label.
Create one if none exists so far for the current function.
- This function is called for both label definitions and label references. */
+ This is called when a label is used in a goto expression or
+ has its address taken. */
tree
-lookup_label (id)
- tree id;
+lookup_label (tree name)
{
- tree decl = IDENTIFIER_LABEL_VALUE (id);
+ tree label;
if (current_function_decl == 0)
{
- error ("label %s referenced outside of any function",
- IDENTIFIER_POINTER (id));
+ error ("label %qE referenced outside of any function", name);
return 0;
}
- /* Use a label already defined or ref'd with this name. */
- if (decl != 0)
+ /* Use a label already defined or ref'd with this name, but not if
+ it is inherited from a containing function and wasn't declared
+ using __label__. */
+ label = I_LABEL_DECL (name);
+ if (label && (DECL_CONTEXT (label) == current_function_decl
+ || C_DECLARED_LABEL_FLAG (label)))
{
- /* But not if it is inherited and wasn't declared to be inheritable. */
- if (DECL_CONTEXT (decl) != current_function_decl
- && ! C_DECLARED_LABEL_FLAG (decl))
- return shadow_label (id);
- return decl;
+ /* If the label has only been declared, update its apparent
+ location to point here, for better diagnostics if it
+ turns out not to have been defined. */
+ if (!TREE_USED (label))
+ DECL_SOURCE_LOCATION (label) = input_location;
+ return label;
}
- decl = build_decl (LABEL_DECL, id, void_type_node);
-
- /* A label not explicitly declared must be local to where it's ref'd. */
- DECL_CONTEXT (decl) = current_function_decl;
-
- DECL_MODE (decl) = VOIDmode;
+ /* No label binding for that identifier; make one. */
+ label = make_label (name, input_location);
- /* Say where one reference is to the label,
- for the sake of the error if it is not defined. */
- DECL_SOURCE_LINE (decl) = lineno;
- DECL_SOURCE_FILE (decl) = input_filename;
-
- IDENTIFIER_LABEL_VALUE (id) = decl;
-
- named_labels = tree_cons (NULL_TREE, decl, named_labels);
-
- return decl;
+ /* Ordinary labels go in the current function scope. */
+ bind (name, label, current_function_scope,
+ /*invisible=*/false, /*nested=*/false);
+ return label;
}
-/* Make a label named NAME in the current function,
- shadowing silently any that may be inherited from containing functions
- or containing scopes.
-
- Note that valid use, if the label being shadowed
- comes from another scope in the same function,
- requires calling declare_nonlocal_label right away. */
+/* Make a label named NAME in the current function, shadowing silently
+ any that may be inherited from containing functions or containing
+ scopes. This is called for __label__ declarations. */
tree
-shadow_label (name)
- tree name;
+declare_label (tree name)
{
- tree decl = IDENTIFIER_LABEL_VALUE (name);
+ struct c_binding *b = I_LABEL_BINDING (name);
+ tree label;
- if (decl != 0)
+ /* Check to make sure that the label hasn't already been declared
+ at this scope */
+ if (b && B_IN_CURRENT_SCOPE (b))
{
- tree dup;
-
- /* Check to make sure that the label hasn't already been declared
- at this label scope */
- for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
- if (TREE_VALUE (dup) == decl)
- {
- error ("duplicate label declaration `%s'",
- IDENTIFIER_POINTER (name));
- error_with_decl (TREE_VALUE (dup),
- "this is a previous declaration");
- /* Just use the previous declaration. */
- return lookup_label (name);
- }
+ error ("duplicate label declaration %qE", name);
+ locate_old_decl (b->decl);
- shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
- IDENTIFIER_LABEL_VALUE (name) = decl = 0;
+ /* Just use the previous declaration. */
+ return b->decl;
}
- return lookup_label (name);
+ label = make_label (name, input_location);
+ C_DECLARED_LABEL_FLAG (label) = 1;
+
+ /* Declared labels go in the current scope. */
+ bind (name, label, current_scope,
+ /*invisible=*/false, /*nested=*/false);
+ return label;
}
/* Define a label, specifying the location in the source file.
Otherwise return 0. */
tree
-define_label (filename, line, name)
- const char *filename;
- int line;
- tree name;
+define_label (location_t location, tree name)
{
- tree decl = lookup_label (name);
-
- /* If label with this name is known from an outer context, shadow it. */
- if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
- {
- shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
- IDENTIFIER_LABEL_VALUE (name) = 0;
- decl = lookup_label (name);
+ /* Find any preexisting label with this name. It is an error
+ if that label has already been defined in this function, or
+ if there is a containing function with a declared label with
+ the same name. */
+ tree label = I_LABEL_DECL (name);
+ struct c_label_list *nlist_se, *nlist_vm;
+
+ if (label
+ && ((DECL_CONTEXT (label) == current_function_decl
+ && DECL_INITIAL (label) != 0)
+ || (DECL_CONTEXT (label) != current_function_decl
+ && C_DECLARED_LABEL_FLAG (label))))
+ {
+ error ("%Hduplicate label %qD", &location, label);
+ locate_old_decl (label);
+ return 0;
}
-
- if (warn_traditional && !in_system_header && lookup_name (name))
- warning_with_file_and_line (filename, line,
- "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
- IDENTIFIER_POINTER (name));
-
- if (DECL_INITIAL (decl) != 0)
+ else if (label && DECL_CONTEXT (label) == current_function_decl)
{
- error_with_file_and_line (filename, line, "duplicate label `%s'",
- IDENTIFIER_POINTER (name));
- return 0;
+ /* The label has been used or declared already in this function,
+ but not defined. Update its location to point to this
+ definition. */
+ if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
+ error ("%Jjump into statement expression", label);
+ if (C_DECL_UNDEFINABLE_VM (label))
+ error ("%Jjump into scope of identifier with variably modified type",
+ label);
+ DECL_SOURCE_LOCATION (label) = location;
}
else
{
- /* Mark label as having been defined. */
- DECL_INITIAL (decl) = error_mark_node;
- /* Say where in the source. */
- DECL_SOURCE_FILE (decl) = filename;
- DECL_SOURCE_LINE (decl) = line;
- return decl;
- }
-}
-\f
-/* Return the list of declarations of the current level.
- Note that this list is in reverse order unless/until
- you nreverse it; and when you do nreverse it, you must
- store the result back using `storedecls' or you will lose. */
+ /* No label binding for that identifier; make one. */
+ label = make_label (name, location);
-tree
-getdecls ()
-{
- return current_binding_level->names;
-}
-
-/* Return the list of type-tags (for structs, etc) of the current level. */
-
-tree
-gettags ()
-{
- return current_binding_level->tags;
-}
+ /* Ordinary labels go in the current function scope. */
+ bind (name, label, current_function_scope,
+ /*invisible=*/false, /*nested=*/false);
+ }
-/* Store the list of declarations of the current level.
- This is done for the parameter declarations of a function being defined,
- after they are modified in the light of any missing parameters. */
+ if (!in_system_header && lookup_name (name))
+ warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
+ "for labels, identifier %qE conflicts", &location, name);
-static void
-storedecls (decls)
- tree decls;
-{
- current_binding_level->names = decls;
-}
+ nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
+ nlist_se->next = label_context_stack_se->labels_def;
+ nlist_se->label = label;
+ label_context_stack_se->labels_def = nlist_se;
-/* Similarly, store the list of tags of the current level. */
+ nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
+ nlist_vm->next = label_context_stack_vm->labels_def;
+ nlist_vm->label = label;
+ label_context_stack_vm->labels_def = nlist_vm;
-static void
-storetags (tags)
- tree tags;
-{
- current_binding_level->tags = tags;
+ /* Mark label as having been defined. */
+ DECL_INITIAL (label) = error_mark_node;
+ return label;
}
\f
/* Given NAME, an IDENTIFIER_NODE,
return the structure (or union or enum) definition for that name.
- Searches binding levels from BINDING_LEVEL up to the global level.
- If THISLEVEL_ONLY is nonzero, searches only the specified context
- (but skips any tag-transparent contexts to find one that is
- meaningful for tags).
+ If THISLEVEL_ONLY is nonzero, searches only the current_scope.
CODE says which kind of type the caller wants;
it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
If the wrong kind of type is found, an error is reported. */
static tree
-lookup_tag (code, name, binding_level, thislevel_only)
- enum tree_code code;
- struct binding_level *binding_level;
- tree name;
- int thislevel_only;
+lookup_tag (enum tree_code code, tree name, int thislevel_only)
{
- struct binding_level *level;
- int thislevel = 1;
+ struct c_binding *b = I_TAG_BINDING (name);
+ int thislevel = 0;
+
+ if (!b || !b->decl)
+ return 0;
- for (level = binding_level; level; level = level->level_chain)
+ /* We only care about whether it's in this level if
+ thislevel_only was set or it might be a type clash. */
+ if (thislevel_only || TREE_CODE (b->decl) != code)
{
- tree tail;
- for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
- {
- if (TREE_PURPOSE (tail) == name)
- {
- if (TREE_CODE (TREE_VALUE (tail)) != code)
- {
- /* Definition isn't the kind we were looking for. */
- pending_invalid_xref = name;
- pending_invalid_xref_file = input_filename;
- pending_invalid_xref_line = lineno;
- /* If in the same binding level as a declaration as a tag
- of a different type, this must not be allowed to
- shadow that tag, so give the error immediately.
- (For example, "struct foo; union foo;" is invalid.) */
- if (thislevel)
- pending_xref_error ();
- }
- return TREE_VALUE (tail);
- }
- }
- if (! level->tag_transparent)
- {
- if (thislevel_only)
- return NULL_TREE;
- thislevel = 0;
- }
+ /* For our purposes, a tag in the external scope is the same as
+ a tag in the file scope. (Primarily relevant to Objective-C
+ and its builtin structure tags, which get pushed before the
+ file scope is created.) */
+ if (B_IN_CURRENT_SCOPE (b)
+ || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
+ thislevel = 1;
}
- return NULL_TREE;
+
+ if (thislevel_only && !thislevel)
+ return 0;
+
+ if (TREE_CODE (b->decl) != code)
+ {
+ /* Definition isn't the kind we were looking for. */
+ pending_invalid_xref = name;
+ pending_invalid_xref_location = input_location;
+
+ /* If in the same binding level as a declaration as a tag
+ of a different type, this must not be allowed to
+ shadow that tag, so give the error immediately.
+ (For example, "struct foo; union foo;" is invalid.) */
+ if (thislevel)
+ pending_xref_error ();
+ }
+ return b->decl;
}
/* Print an error message now
when used in the `struct foo;' construct for shadowing. */
void
-pending_xref_error ()
+pending_xref_error (void)
{
if (pending_invalid_xref != 0)
- error_with_file_and_line (pending_invalid_xref_file,
- pending_invalid_xref_line,
- "`%s' defined as wrong kind of tag",
- IDENTIFIER_POINTER (pending_invalid_xref));
+ error ("%H%qE defined as wrong kind of tag",
+ &pending_invalid_xref_location, pending_invalid_xref);
pending_invalid_xref = 0;
}
-/* Given a type, find the tag that was defined for it and return the tag name.
- Otherwise return 0. */
-
-static tree
-lookup_tag_reverse (type)
- tree type;
-{
- struct binding_level *level;
-
- for (level = current_binding_level; level; level = level->level_chain)
- {
- tree tail;
- for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
- {
- if (TREE_VALUE (tail) == type)
- return TREE_PURPOSE (tail);
- }
- }
- return NULL_TREE;
-}
\f
-/* Look up NAME in the current binding level and its superiors
+/* Look up NAME in the current scope and its superiors
in the namespace of variables, functions and typedefs.
Return a ..._DECL node of some kind representing its definition,
or return 0 if it is undefined. */
tree
-lookup_name (name)
- tree name;
+lookup_name (tree name)
{
- tree val;
-
- if (current_binding_level != global_binding_level
- && IDENTIFIER_LOCAL_VALUE (name))
- val = IDENTIFIER_LOCAL_VALUE (name);
- else
- val = IDENTIFIER_GLOBAL_VALUE (name);
- return val;
+ struct c_binding *b = I_SYMBOL_BINDING (name);
+ if (b && !b->invisible)
+ return b->decl;
+ return 0;
}
-/* Similar to `lookup_name' but look only at current binding level. */
+/* Similar to `lookup_name' but look only at the indicated scope. */
-tree
-lookup_name_current_level (name)
- tree name;
+static tree
+lookup_name_in_scope (tree name, struct c_scope *scope)
{
- tree t;
-
- if (current_binding_level == global_binding_level)
- return IDENTIFIER_GLOBAL_VALUE (name);
-
- if (IDENTIFIER_LOCAL_VALUE (name) == 0)
- return 0;
-
- for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
- if (DECL_NAME (t) == name)
- break;
+ struct c_binding *b;
- return t;
+ for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
+ if (B_IN_SCOPE (b, scope))
+ return b->decl;
+ return 0;
}
\f
-/* Mark ARG for GC. */
-
-static void
-mark_binding_level (arg)
- void *arg;
-{
- struct binding_level *level = *(struct binding_level **) arg;
-
- for (; level != 0; level = level->level_chain)
- {
- ggc_mark_tree (level->names);
- ggc_mark_tree (level->tags);
- ggc_mark_tree (level->shadowed);
- ggc_mark_tree (level->blocks);
- ggc_mark_tree (level->this_block);
- ggc_mark_tree (level->parm_order);
- }
-}
-
/* Create the predefined scalar types of C,
and some nodes representing standard constants (0, 1, (void *) 0).
- Initialize the global binding level.
+ Initialize the global scope.
Make definitions for built-in primitive functions. */
void
-c_init_decl_processing ()
+c_init_decl_processing (void)
{
- tree endlink;
- tree ptr_ftype_void, ptr_ftype_ptr;
+ location_t save_loc = input_location;
- /* Adds some ggc roots, and reserved words for c-parse.in. */
+ /* Initialize reserved words for parser. */
c_parse_init ();
- current_function_decl = NULL;
- named_labels = NULL;
- current_binding_level = NULL_BINDING_LEVEL;
- free_binding_level = NULL_BINDING_LEVEL;
+ current_function_decl = 0;
+
+ gcc_obstack_init (&parser_obstack);
+
+ /* Make the externals scope. */
+ push_scope ();
+ external_scope = current_scope;
- /* Make the binding_level structure for global names. */
- pushlevel (0);
- global_binding_level = current_binding_level;
+ /* Declarations from c_common_nodes_and_builtins must not be associated
+ with this input file, lest we get differences between using and not
+ using preprocessed headers. */
+ input_location = BUILTINS_LOCATION;
- build_common_tree_nodes (flag_signed_char);
+ build_common_tree_nodes (flag_signed_char, false);
c_common_nodes_and_builtins ();
- boolean_type_node = integer_type_node;
- boolean_true_node = integer_one_node;
- boolean_false_node = integer_zero_node;
+ /* In C, comparisons and TRUTH_* expressions have type int. */
+ truthvalue_type_node = integer_type_node;
+ truthvalue_true_node = integer_one_node;
+ truthvalue_false_node = integer_zero_node;
- c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
- TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
- TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
- TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
- TYPE_PRECISION (c_bool_type_node) = 1;
+ /* Even in C99, which has a real boolean type. */
pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
- c_bool_type_node));
- c_bool_false_node = build_int_2 (0, 0);
- TREE_TYPE (c_bool_false_node) = c_bool_type_node;
- c_bool_true_node = build_int_2 (1, 0);
- TREE_TYPE (c_bool_true_node) = c_bool_type_node;
+ boolean_type_node));
- endlink = void_list_node;
- ptr_ftype_void = build_function_type (ptr_type_node, endlink);
- ptr_ftype_ptr
- = build_function_type (ptr_type_node,
- tree_cons (NULL_TREE, ptr_type_node, endlink));
+ input_location = save_loc;
- pedantic_lvalues = pedantic;
+ pedantic_lvalues = true;
make_fname_decl = c_make_fname_decl;
start_fname_decls ();
-
- incomplete_decl_finalize_hook = finish_incomplete_decl;
-
- /* Record our roots. */
-
- ggc_add_tree_root (c_global_trees, CTI_MAX);
- ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
- ggc_add_tree_root (&c_scope_stmt_stack, 1);
- ggc_add_tree_root (&named_labels, 1);
- ggc_add_tree_root (&shadowed_labels, 1);
- ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
- mark_binding_level);
- ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
- mark_binding_level);
- ggc_add_tree_root (&static_ctors, 1);
- ggc_add_tree_root (&static_dtors, 1);
}
/* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
NAME depended on the type of the function. As we don't yet implement
delayed emission of static data, we mark the decl as emitted
so it is not placed in the output. Anything using it must therefore pull
- out the STRING_CST initializer directly. This does mean that these names
- are string merging candidates, which is wrong for C99's __func__. FIXME. */
+ out the STRING_CST initializer directly. FIXME. */
static tree
-c_make_fname_decl (id, type_dep)
- tree id;
- int type_dep;
+c_make_fname_decl (tree id, int type_dep)
{
const char *name = fname_as_string (type_dep);
tree decl, type, init;
size_t length = strlen (name);
- type = build_array_type
- (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
- build_index_type (size_int (length)));
+ type = build_array_type (char_type_node,
+ build_index_type (size_int (length)));
+ type = c_build_qualified_type (type, TYPE_QUAL_CONST);
decl = build_decl (VAR_DECL, id, type);
- /* We don't push the decl, so have to set its context here. */
- DECL_CONTEXT (decl) = current_function_decl;
-
+
TREE_STATIC (decl) = 1;
TREE_READONLY (decl) = 1;
DECL_ARTIFICIAL (decl) = 1;
-
+
init = build_string (length + 1, name);
+ free (CONST_CAST (char *, name));
TREE_TYPE (init) = type;
DECL_INITIAL (decl) = init;
TREE_USED (decl) = 1;
-
+
+ if (current_function_decl
+ /* For invalid programs like this:
+
+ void foo()
+ const char* p = __FUNCTION__;
+
+ the __FUNCTION__ is believed to appear in K&R style function
+ parameter declarator. In that case we still don't have
+ function_scope. */
+ && (!errorcount || current_function_scope))
+ {
+ DECL_CONTEXT (decl) = current_function_decl;
+ bind (id, decl, current_function_scope,
+ /*invisible=*/false, /*nested=*/false);
+ }
+
finish_decl (decl, init, NULL_TREE);
return decl;
}
-/* Return a definition for a builtin function named NAME and whose data type
- is TYPE. TYPE should be a function type with argument types.
- FUNCTION_CODE tells later passes how to compile calls to this function.
- See tree.h for its possible values.
-
- If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
- the name to be called if we can't opencode the function. */
-
tree
-builtin_function (name, type, function_code, class, library_name)
- const char *name;
- tree type;
- int function_code;
- enum built_in_class class;
- const char *library_name;
+c_builtin_function (tree decl)
{
- tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
- DECL_EXTERNAL (decl) = 1;
- TREE_PUBLIC (decl) = 1;
- /* If -traditional, permit redefining a builtin function any way you like.
- (Though really, if the program redefines these functions,
- it probably won't work right unless compiled with -fno-builtin.) */
- if (flag_traditional && name[0] != '_')
- DECL_BUILT_IN_NONANSI (decl) = 1;
- if (library_name)
- SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
- make_decl_rtl (decl, NULL);
- pushdecl (decl);
- DECL_BUILT_IN_CLASS (decl) = class;
- DECL_FUNCTION_CODE (decl) = function_code;
+ tree type = TREE_TYPE (decl);
+ tree id = DECL_NAME (decl);
- /* The return builtins leave the current function. */
- if (function_code == BUILT_IN_RETURN || function_code == BUILT_IN_EH_RETURN)
- TREE_THIS_VOLATILE (decl) = 1;
+ const char *name = IDENTIFIER_POINTER (id);
+ C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
- /* Warn if a function in the namespace for users
- is used without an occasion to consider it declared. */
- if (name[0] != '_' || name[1] != '_')
- C_DECL_ANTICIPATED (decl) = 1;
+ /* Should never be called on a symbol with a preexisting meaning. */
+ gcc_assert (!I_SYMBOL_BINDING (id));
- /* Possibly apply some default attributes to this built-in function. */
- decl_attributes (&decl, NULL_TREE, 0);
+ bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
+
+ /* Builtins in the implementation namespace are made visible without
+ needing to be explicitly declared. See push_file_scope. */
+ if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
+ {
+ TREE_CHAIN (decl) = visible_builtins;
+ visible_builtins = decl;
+ }
return decl;
}
-/* Apply default attributes to a function, if a system function with default
- attributes. */
-
-void
-insert_default_attributes (decl)
- tree decl;
+tree
+c_builtin_function_ext_scope (tree decl)
{
- if (!TREE_PUBLIC (decl))
- return;
- c_common_insert_default_attributes (decl);
+ tree type = TREE_TYPE (decl);
+ tree id = DECL_NAME (decl);
+
+ const char *name = IDENTIFIER_POINTER (id);
+ C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
+
+ /* Should never be called on a symbol with a preexisting meaning. */
+ gcc_assert (!I_SYMBOL_BINDING (id));
+
+ bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false);
+
+ /* Builtins in the implementation namespace are made visible without
+ needing to be explicitly declared. See push_file_scope. */
+ if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
+ {
+ TREE_CHAIN (decl) = visible_builtins;
+ visible_builtins = decl;
+ }
+
+ return decl;
}
\f
/* Called when a declaration is seen that contains no names to declare.
Otherwise, it is an error. */
void
-shadow_tag (declspecs)
- tree declspecs;
+shadow_tag (const struct c_declspecs *declspecs)
{
shadow_tag_warned (declspecs, 0);
}
+/* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
+ but no pedwarn. */
void
-shadow_tag_warned (declspecs, warned)
- tree declspecs;
- int warned;
- /* 1 => we have done a pedwarn. 2 => we have done a warning, but
- no pedwarn. */
+shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
{
- int found_tag = 0;
- tree link;
- tree specs, attrs;
-
- pending_invalid_xref = 0;
+ bool found_tag = false;
- /* Remove the attributes from declspecs, since they will confuse the
- following code. */
- split_specs_attrs (declspecs, &specs, &attrs);
-
- for (link = specs; link; link = TREE_CHAIN (link))
+ if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
{
- tree value = TREE_VALUE (link);
+ tree value = declspecs->type;
enum tree_code code = TREE_CODE (value);
if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
/* Used to test also that TYPE_SIZE (value) != 0.
That caused warning for `struct foo;' at top level in the file. */
{
- tree name = lookup_tag_reverse (value);
+ tree name = TYPE_NAME (value);
tree t;
- found_tag++;
+ found_tag = true;
if (name == 0)
{
if (warned != 1 && code != ENUMERAL_TYPE)
/* Empty unnamed enum OK */
{
- pedwarn ("unnamed struct/union that defines no instances");
+ pedwarn (input_location, 0,
+ "unnamed struct/union that defines no instances");
warned = 1;
}
}
+ else if (!declspecs->tag_defined_p
+ && declspecs->storage_class != csc_none)
+ {
+ if (warned != 1)
+ pedwarn (input_location, 0,
+ "empty declaration with storage class specifier "
+ "does not redeclare tag");
+ warned = 1;
+ pending_xref_error ();
+ }
+ else if (!declspecs->tag_defined_p
+ && (declspecs->const_p
+ || declspecs->volatile_p
+ || declspecs->restrict_p))
+ {
+ if (warned != 1)
+ pedwarn (input_location, 0,
+ "empty declaration with type qualifier "
+ "does not redeclare tag");
+ warned = 1;
+ pending_xref_error ();
+ }
else
{
- t = lookup_tag (code, name, current_binding_level, 1);
+ pending_invalid_xref = 0;
+ t = lookup_tag (code, name, 1);
if (t == 0)
{
}
else
{
- if (!warned && ! in_system_header)
+ if (warned != 1 && !in_system_header)
{
- warning ("useless keyword or type name in empty declaration");
- warned = 2;
+ pedwarn (input_location, 0,
+ "useless type name in empty declaration");
+ warned = 1;
}
}
}
+ else if (warned != 1 && !in_system_header && declspecs->typedef_p)
+ {
+ pedwarn (input_location, 0, "useless type name in empty declaration");
+ warned = 1;
+ }
+
+ pending_invalid_xref = 0;
+
+ if (declspecs->inline_p)
+ {
+ error ("%<inline%> in empty declaration");
+ warned = 1;
+ }
+
+ if (current_scope == file_scope && declspecs->storage_class == csc_auto)
+ {
+ error ("%<auto%> in file-scope empty declaration");
+ warned = 1;
+ }
+
+ if (current_scope == file_scope && declspecs->storage_class == csc_register)
+ {
+ error ("%<register%> in file-scope empty declaration");
+ warned = 1;
+ }
+
+ if (!warned && !in_system_header && declspecs->storage_class != csc_none)
+ {
+ warning (0, "useless storage class specifier in empty declaration");
+ warned = 2;
+ }
+
+ if (!warned && !in_system_header && declspecs->thread_p)
+ {
+ warning (0, "useless %<__thread%> in empty declaration");
+ warned = 2;
+ }
- if (found_tag > 1)
- error ("two types specified in one empty declaration");
+ if (!warned && !in_system_header && (declspecs->const_p
+ || declspecs->volatile_p
+ || declspecs->restrict_p))
+ {
+ warning (0, "useless type qualifier in empty declaration");
+ warned = 2;
+ }
if (warned != 1)
{
- if (found_tag == 0)
- pedwarn ("empty declaration");
+ if (!found_tag)
+ pedwarn (input_location, 0, "empty declaration");
}
}
\f
-/* Construct an array declarator. EXPR is the expression inside [], or
- NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
- to the pointer to which a parameter array is converted). STATIC_P is
- non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
- is non-zero is the array is [*], a VLA of unspecified length which is
- nevertheless a complete type (not currently implemented by GCC),
- zero otherwise. The declarator is constructed as an ARRAY_REF
- (to be decoded by grokdeclarator), whose operand 0 is what's on the
- left of the [] (filled by in set_array_declarator_type) and operand 1
- is the expression inside; whose TREE_TYPE is the type qualifiers and
- which has TREE_STATIC set if "static" is used. */
-tree
-build_array_declarator (expr, quals, static_p, vla_unspec_p)
- tree expr;
- tree quals;
- int static_p;
- int vla_unspec_p;
+/* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
+ bits. SPECS represents declaration specifiers that the grammar
+ only permits to contain type qualifiers and attributes. */
+
+int
+quals_from_declspecs (const struct c_declspecs *specs)
{
- tree decl;
- decl = build_nt (ARRAY_REF, NULL_TREE, expr);
- TREE_TYPE (decl) = quals;
- TREE_STATIC (decl) = (static_p ? 1 : 0);
- if (pedantic && !flag_isoc99)
+ int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
+ | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
+ | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
+ gcc_assert (!specs->type
+ && !specs->decl_attr
+ && specs->typespec_word == cts_none
+ && specs->storage_class == csc_none
+ && !specs->typedef_p
+ && !specs->explicit_signed_p
+ && !specs->deprecated_p
+ && !specs->long_p
+ && !specs->long_long_p
+ && !specs->short_p
+ && !specs->signed_p
+ && !specs->unsigned_p
+ && !specs->complex_p
+ && !specs->inline_p
+ && !specs->thread_p);
+ return quals;
+}
+
+/* Construct an array declarator. EXPR is the expression inside [],
+ or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
+ applied to the pointer to which a parameter array is converted).
+ STATIC_P is true if "static" is inside the [], false otherwise.
+ VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
+ length which is nevertheless a complete type, false otherwise. The
+ field for the contained declarator is left to be filled in by
+ set_array_declarator_inner. */
+
+struct c_declarator *
+build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
+ bool vla_unspec_p)
+{
+ struct c_declarator *declarator = XOBNEW (&parser_obstack,
+ struct c_declarator);
+ declarator->kind = cdk_array;
+ declarator->declarator = 0;
+ declarator->u.array.dimen = expr;
+ if (quals)
+ {
+ declarator->u.array.attrs = quals->attrs;
+ declarator->u.array.quals = quals_from_declspecs (quals);
+ }
+ else
+ {
+ declarator->u.array.attrs = NULL_TREE;
+ declarator->u.array.quals = 0;
+ }
+ declarator->u.array.static_p = static_p;
+ declarator->u.array.vla_unspec_p = vla_unspec_p;
+ if (!flag_isoc99)
{
- if (static_p || quals != NULL_TREE)
- pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
+ if (static_p || quals != NULL)
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C90 does not support %<static%> or type "
+ "qualifiers in parameter array declarators");
if (vla_unspec_p)
- pedwarn ("ISO C89 does not support `[*]' array declarators");
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C90 does not support %<[*]%> array declarators");
}
if (vla_unspec_p)
- warning ("GCC does not yet properly implement `[*]' array declarators");
- return decl;
+ {
+ if (!current_scope->parm_flag)
+ {
+ /* C99 6.7.5.2p4 */
+ error ("%<[*]%> not allowed in other than function prototype scope");
+ declarator->u.array.vla_unspec_p = false;
+ return NULL;
+ }
+ current_scope->had_vla_unspec = true;
+ }
+ return declarator;
}
-/* Set the type of an array declarator. DECL is the declarator, as
- constructed by build_array_declarator; TYPE is what appears on the left
- of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
- abstract declarator, zero otherwise; this is used to reject static and
- type qualifiers in abstract declarators, where they are not in the
- C99 grammar. */
+/* Set the contained declarator of an array declarator. DECL is the
+ declarator, as constructed by build_array_declarator; INNER is what
+ appears on the left of the []. */
-tree
-set_array_declarator_type (decl, type, abstract_p)
- tree decl;
- tree type;
- int abstract_p;
+struct c_declarator *
+set_array_declarator_inner (struct c_declarator *decl,
+ struct c_declarator *inner)
{
- TREE_OPERAND (decl, 0) = type;
- if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
- error ("static or type qualifiers in abstract declarator");
+ decl->declarator = inner;
return decl;
}
+
+/* INIT is a constructor that forms DECL's initializer. If the final
+ element initializes a flexible array field, add the size of that
+ initializer to DECL's size. */
+
+static void
+add_flexible_array_elts_to_size (tree decl, tree init)
+{
+ tree elt, type;
+
+ if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
+ return;
+
+ elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
+ type = TREE_TYPE (elt);
+ if (TREE_CODE (type) == ARRAY_TYPE
+ && TYPE_SIZE (type) == NULL_TREE
+ && TYPE_DOMAIN (type) != NULL_TREE
+ && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
+ {
+ complete_array_type (&type, elt, false);
+ DECL_SIZE (decl)
+ = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
+ DECL_SIZE_UNIT (decl)
+ = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
+ }
+}
\f
/* Decode a "typename", such as "int **", returning a ..._TYPE node. */
tree
-groktypename (typename)
- tree typename;
+groktypename (struct c_type_name *type_name)
{
- tree specs, attrs;
-
- if (TREE_CODE (typename) != TREE_LIST)
- return typename;
+ tree type;
+ tree attrs = type_name->specs->attrs;
- split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
+ type_name->specs->attrs = NULL_TREE;
- typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
+ type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
+ false, NULL, &attrs, DEPRECATED_NORMAL);
/* Apply attributes. */
- decl_attributes (&typename, attrs, 0);
-
- return typename;
-}
+ decl_attributes (&type, attrs, 0);
-/* Return a PARM_DECL node for a given pair of specs and declarator. */
-
-tree
-groktypename_in_parm_context (typename)
- tree typename;
-{
- if (TREE_CODE (typename) != TREE_LIST)
- return typename;
- return grokdeclarator (TREE_VALUE (typename),
- TREE_PURPOSE (typename),
- PARM, 0);
+ return type;
}
/* Decode a declarator in an ordinary declaration or data definition.
grokfield and not through here. */
tree
-start_decl (declarator, declspecs, initialized, attributes)
- tree declarator, declspecs;
- int initialized;
- tree attributes;
+start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
+ bool initialized, tree attributes)
{
tree decl;
tree tem;
-
+ enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
+
/* An object declared as __attribute__((deprecated)) suppresses
warnings of uses of other deprecated items. */
if (lookup_attribute ("deprecated", attributes))
deprecated_state = DEPRECATED_SUPPRESS;
decl = grokdeclarator (declarator, declspecs,
- NORMAL, initialized);
-
- deprecated_state = DEPRECATED_NORMAL;
+ NORMAL, initialized, NULL, &attributes,
+ deprecated_state);
+ if (!decl)
+ return 0;
- if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
- && MAIN_NAME_P (DECL_NAME (decl)))
- warning_with_decl (decl, "`%s' is usually a function");
+ if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
+ warning (OPT_Wmain, "%q+D is usually a function", decl);
if (initialized)
/* Is it valid for this decl to have an initializer at all?
If not, set INITIALIZED to zero, which will indirectly
- tell `finish_decl' to ignore the initializer once it is parsed. */
+ tell 'finish_decl' to ignore the initializer once it is parsed. */
switch (TREE_CODE (decl))
{
case TYPE_DECL:
- error ("typedef `%s' is initialized (use __typeof__ instead)",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("typedef %qD is initialized (use __typeof__ instead)", decl);
initialized = 0;
break;
case FUNCTION_DECL:
- error ("function `%s' is initialized like a variable",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("function %qD is initialized like a variable", decl);
initialized = 0;
break;
case PARM_DECL:
/* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
- error ("parameter `%s' is initialized",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("parameter %qD is initialized", decl);
initialized = 0;
break;
default:
- /* Don't allow initializations for incomplete types
- except for arrays which might be completed by the initialization. */
+ /* Don't allow initializations for incomplete types except for
+ arrays which might be completed by the initialization. */
- /* This can happen if the array size is an undefined macro. We already
- gave a warning, so we don't need another one. */
+ /* This can happen if the array size is an undefined macro.
+ We already gave a warning, so we don't need another one. */
if (TREE_TYPE (decl) == error_mark_node)
initialized = 0;
else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
}
else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
{
- error ("variable `%s' has initializer but incomplete type",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ error ("variable %qD has initializer but incomplete type", decl);
initialized = 0;
}
- else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
+ else if (C_DECL_VARIABLE_SIZE (decl))
{
- error ("elements of array `%s' have incomplete type",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
+ /* Although C99 is unclear about whether incomplete arrays
+ of VLAs themselves count as VLAs, it does not make
+ sense to permit them to be initialized given that
+ ordinary VLAs may not be initialized. */
+ error ("variable-sized object may not be initialized");
initialized = 0;
}
}
if (initialized)
{
-#if 0
- /* Seems redundant with grokdeclarator. */
- if (current_binding_level != global_binding_level
- && DECL_EXTERNAL (decl)
- && TREE_CODE (decl) != FUNCTION_DECL)
- warning ("declaration of `%s' has `extern' and is initialized",
- IDENTIFIER_POINTER (DECL_NAME (decl)));
-#endif
- DECL_EXTERNAL (decl) = 0;
- if (current_binding_level == global_binding_level)
+ if (current_scope == file_scope)
TREE_STATIC (decl) = 1;
- /* Tell `pushdecl' this is an initialized decl
+ /* Tell 'pushdecl' this is an initialized decl
even though we don't yet have the initializer expression.
- Also tell `finish_decl' it may store the real initializer. */
+ Also tell 'finish_decl' it may store the real initializer. */
DECL_INITIAL (decl) = error_mark_node;
}
/* ANSI specifies that a tentative definition which is not merged with
a non-tentative definition behaves exactly like a definition with an
initializer equal to zero. (Section 3.7.2)
- -fno-common gives strict ANSI behavior. Usually you don't want it.
- This matters only for variables with external linkage. */
- if (! flag_no_common || ! TREE_PUBLIC (decl))
+
+ -fno-common gives strict ANSI behavior, though this tends to break
+ a large body of code that grew up without this rule.
+
+ Thread-local variables are never common, since there's no entrenched
+ body of code to break, and it allows more efficient variable references
+ in the presence of dynamic linking. */
+
+ if (TREE_CODE (decl) == VAR_DECL
+ && !initialized
+ && TREE_PUBLIC (decl)
+ && !DECL_THREAD_LOCAL_P (decl)
+ && !flag_no_common)
DECL_COMMON (decl) = 1;
/* Set attributes here so if duplicate decl, will have proper attributes. */
decl_attributes (&decl, attributes, 0);
- /* If #pragma weak was used, mark the decl weak now. */
- if (current_binding_level == global_binding_level)
- maybe_apply_pragma_weak (decl);
+ /* Handle gnu_inline attribute. */
+ if (declspecs->inline_p
+ && !flag_gnu89_inline
+ && TREE_CODE (decl) == FUNCTION_DECL
+ && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
+ || current_function_decl))
+ {
+ if (declspecs->storage_class == csc_auto && current_scope != file_scope)
+ ;
+ else if (declspecs->storage_class != csc_static)
+ DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
+ }
+
+ if (TREE_CODE (decl) == FUNCTION_DECL
+ && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
+ {
+ struct c_declarator *ce = declarator;
+
+ if (ce->kind == cdk_pointer)
+ ce = declarator->declarator;
+ if (ce->kind == cdk_function)
+ {
+ tree args = ce->u.arg_info->parms;
+ for (; args; args = TREE_CHAIN (args))
+ {
+ tree type = TREE_TYPE (args);
+ if (type && INTEGRAL_TYPE_P (type)
+ && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
+ DECL_ARG_TYPE (args) = integer_type_node;
+ }
+ }
+ }
if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl)
&& DECL_UNINLINABLE (decl)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
- warning_with_decl (decl,
- "inline function `%s' given attribute noinline");
-
- /* Add this decl to the current binding level.
+ warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
+ decl);
+
+ /* C99 6.7.4p3: An inline definition of a function with external
+ linkage shall not contain a definition of a modifiable object
+ with static storage duration... */
+ if (TREE_CODE (decl) == VAR_DECL
+ && current_scope != file_scope
+ && TREE_STATIC (decl)
+ && !TREE_READONLY (decl)
+ && DECL_DECLARED_INLINE_P (current_function_decl)
+ && DECL_EXTERNAL (current_function_decl))
+ pedwarn (input_location, 0,
+ "%q+D is static but declared in inline function %qD "
+ "which is not static", decl, current_function_decl);
+
+ /* Add this decl to the current scope.
TEM may equal DECL or it may be a previous decl of the same name. */
tem = pushdecl (decl);
- /* For a local variable, define the RTL now. */
- if (current_binding_level != global_binding_level
- /* But not if this is a duplicate decl
- and we preserved the rtl from the previous one
- (which may or may not happen). */
- && !DECL_RTL_SET_P (tem)
- && !DECL_CONTEXT (tem))
+ if (initialized && DECL_EXTERNAL (tem))
{
- if (TREE_TYPE (tem) != error_mark_node
- && COMPLETE_TYPE_P (TREE_TYPE (tem)))
- expand_decl (tem);
- else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
- && DECL_INITIAL (tem) != 0)
- expand_decl (tem);
+ DECL_EXTERNAL (tem) = 0;
+ TREE_STATIC (tem) = 1;
}
return tem;
}
+/* Initialize EH if not initialized yet and exceptions are enabled. */
+
+void
+c_maybe_initialize_eh (void)
+{
+ if (!flag_exceptions || c_eh_initialized_p)
+ return;
+
+ c_eh_initialized_p = true;
+ eh_personality_libfunc
+ = init_one_libfunc (USING_SJLJ_EXCEPTIONS
+ ? "__gcc_personality_sj0"
+ : "__gcc_personality_v0");
+ default_init_unwind_resume_libfunc ();
+ using_eh_for_cleanups ();
+}
+
/* Finish processing of a declaration;
install its initial value.
If the length of an array type is not known before,
it must be determined now, from the initial value, or it is an error. */
void
-finish_decl (decl, init, asmspec_tree)
- tree decl, init;
- tree asmspec_tree;
+finish_decl (tree decl, tree init, tree asmspec_tree)
{
- tree type = TREE_TYPE (decl);
+ tree type;
int was_incomplete = (DECL_SIZE (decl) == 0);
const char *asmspec = 0;
/* If a name was specified, get the string. */
- if (current_binding_level == global_binding_level)
+ if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
+ && DECL_FILE_SCOPE_P (decl))
asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
if (asmspec_tree)
asmspec = TREE_STRING_POINTER (asmspec_tree);
+ if (TREE_CODE (decl) == VAR_DECL
+ && TREE_STATIC (decl)
+ && global_bindings_p ())
+ /* So decl is a global variable. Record the types it uses
+ so that we can decide later to emit debug info for them. */
+ record_types_used_by_current_var_decl (decl);
+
/* If `start_decl' didn't like having an initialization, ignore it now. */
if (init != 0 && DECL_INITIAL (decl) == 0)
init = 0;
-
+
/* Don't crash if parm is initialized. */
if (TREE_CODE (decl) == PARM_DECL)
init = 0;
if (init)
store_init_value (decl, init);
- /* Deduce size of array from initialization, if not already known */
+ if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
+ || TREE_CODE (decl) == FUNCTION_DECL
+ || TREE_CODE (decl) == FIELD_DECL))
+ objc_check_decl (decl);
+
+ type = TREE_TYPE (decl);
+
+ /* Deduce size of array from initialization, if not already known. */
if (TREE_CODE (type) == ARRAY_TYPE
&& TYPE_DOMAIN (type) == 0
&& TREE_CODE (decl) != TYPE_DECL)
{
- int do_default
+ bool do_default
= (TREE_STATIC (decl)
/* Even if pedantic, an external linkage array
may have incomplete type at first. */
? pedantic && !TREE_PUBLIC (decl)
: !DECL_EXTERNAL (decl));
int failure
- = complete_array_type (type, DECL_INITIAL (decl), do_default);
+ = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
+ do_default);
/* Get the completed type made by complete_array_type. */
type = TREE_TYPE (decl);
- if (failure == 1)
- error_with_decl (decl, "initializer fails to determine size of `%s'");
-
- else if (failure == 2)
+ switch (failure)
{
+ case 1:
+ error ("initializer fails to determine size of %q+D", decl);
+ break;
+
+ case 2:
if (do_default)
- error_with_decl (decl, "array size missing in `%s'");
+ error ("array size missing in %q+D", decl);
/* If a `static' var's size isn't known,
make it extern as well as static, so it does not get
allocated.
If it is not `static', then do not mark extern;
finish_incomplete_decl will give it a default size
and it will get allocated. */
- else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
+ else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
DECL_EXTERNAL (decl) = 1;
+ break;
+
+ case 3:
+ error ("zero or negative size array %q+D", decl);
+ break;
+
+ case 0:
+ /* For global variables, update the copy of the type that
+ exists in the binding. */
+ if (TREE_PUBLIC (decl))
+ {
+ struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
+ while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
+ b_ext = b_ext->shadowed;
+ if (b_ext)
+ {
+ if (b_ext->type)
+ b_ext->type = composite_type (b_ext->type, type);
+ else
+ b_ext->type = type;
+ }
+ }
+ break;
+
+ default:
+ gcc_unreachable ();
}
- /* TYPE_MAX_VALUE is always one less than the number of elements
- in the array, because we start counting at zero. Therefore,
- warn only if the value is less than zero. */
- else if (pedantic && TYPE_DOMAIN (type) != 0
- && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
- error_with_decl (decl, "zero or negative size array `%s'");
+ if (DECL_INITIAL (decl))
+ TREE_TYPE (DECL_INITIAL (decl)) = type;
layout_decl (decl, 0);
}
if (TREE_CODE (decl) == VAR_DECL)
{
+ if (init && TREE_CODE (init) == CONSTRUCTOR)
+ add_flexible_array_elts_to_size (decl, init);
+
if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
&& COMPLETE_TYPE_P (TREE_TYPE (decl)))
layout_decl (decl, 0);
/* Don't give an error if we already gave one earlier. */
&& TREE_TYPE (decl) != error_mark_node
&& (TREE_STATIC (decl)
- ?
- /* A static variable with an incomplete type
- is an error if it is initialized.
- Also if it is not file scope.
- Otherwise, let it through, but if it is not `extern'
- then it may cause an error message later. */
- (DECL_INITIAL (decl) != 0
- || DECL_CONTEXT (decl) != 0)
- :
- /* An automatic variable with an incomplete type
- is an error. */
- !DECL_EXTERNAL (decl)))
- {
- error_with_decl (decl, "storage size of `%s' isn't known");
- TREE_TYPE (decl) = error_mark_node;
- }
+ /* A static variable with an incomplete type
+ is an error if it is initialized.
+ Also if it is not file scope.
+ Otherwise, let it through, but if it is not `extern'
+ then it may cause an error message later. */
+ ? (DECL_INITIAL (decl) != 0
+ || !DECL_FILE_SCOPE_P (decl))
+ /* An automatic variable with an incomplete type
+ is an error. */
+ : !DECL_EXTERNAL (decl)))
+ {
+ error ("storage size of %q+D isn%'t known", decl);
+ TREE_TYPE (decl) = error_mark_node;
+ }
if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
&& DECL_SIZE (decl) != 0)
if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
constant_expression_warning (DECL_SIZE (decl));
else
- error_with_decl (decl, "storage size of `%s' isn't constant");
+ {
+ error ("storage size of %q+D isn%'t constant", decl);
+ TREE_TYPE (decl) = error_mark_node;
+ }
}
if (TREE_USED (type))
TREE_USED (decl) = 1;
}
- /* If this is a function and an assembler name is specified, it isn't
- builtin any more. Also reset DECL_RTL so we can give it its new
- name. */
+ /* If this is a function and an assembler name is specified, reset DECL_RTL
+ so we can give it its new name. Also, update built_in_decls if it
+ was a normal built-in. */
if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
{
- DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
- SET_DECL_RTL (decl, NULL_RTX);
- SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
+ if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
+ set_builtin_user_assembler_name (decl, asmspec);
+ set_user_assembler_name (decl, asmspec);
}
+ /* If #pragma weak was used, mark the decl weak now. */
+ maybe_apply_pragma_weak (decl);
+
/* Output the assembler code and/or RTL code for variables and functions,
unless the type is an undefined structure or union.
If not, it will get done when the type is completed. */
if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
{
- /* This is a no-op in c-lang.c or something real in objc-actions.c. */
- maybe_objc_check_decl (decl);
+ /* Determine the ELF visibility. */
+ if (TREE_PUBLIC (decl))
+ c_determine_visibility (decl);
+
+ /* This is a no-op in c-lang.c or something real in objc-act.c. */
+ if (c_dialect_objc ())
+ objc_check_decl (decl);
+
+ if (asmspec)
+ {
+ /* If this is not a static variable, issue a warning.
+ It doesn't make any sense to give an ASMSPEC for an
+ ordinary, non-register local variable. Historically,
+ GCC has accepted -- but ignored -- the ASMSPEC in
+ this case. */
+ if (!DECL_FILE_SCOPE_P (decl)
+ && TREE_CODE (decl) == VAR_DECL
+ && !C_DECL_REGISTER (decl)
+ && !TREE_STATIC (decl))
+ warning (0, "ignoring asm-specifier for non-static local "
+ "variable %q+D", decl);
+ else
+ set_user_assembler_name (decl, asmspec);
+ }
- if (!DECL_CONTEXT (decl))
+ if (DECL_FILE_SCOPE_P (decl))
{
if (DECL_INITIAL (decl) == NULL_TREE
|| DECL_INITIAL (decl) == error_mark_node)
when a tentative file-scope definition is seen.
But at end of compilation, do output code for them. */
DECL_DEFER_OUTPUT (decl) = 1;
- rest_of_decl_compilation (decl, asmspec,
- (DECL_CONTEXT (decl) == 0
- || TREE_ASM_WRITTEN (decl)), 0);
+ rest_of_decl_compilation (decl, true, 0);
}
else
{
- /* This is a local variable. If there is an ASMSPEC, the
- user has requested that we handle it specially. */
- if (asmspec)
+ /* In conjunction with an ASMSPEC, the `register'
+ keyword indicates that we should place the variable
+ in a particular register. */
+ if (asmspec && C_DECL_REGISTER (decl))
{
- /* In conjunction with an ASMSPEC, the `register'
- keyword indicates that we should place the variable
- in a particular register. */
- if (DECL_REGISTER (decl))
- DECL_C_HARD_REGISTER (decl) = 1;
-
- /* If this is not a static variable, issue a warning.
- It doesn't make any sense to give an ASMSPEC for an
- ordinary, non-register local variable. Historically,
- GCC has accepted -- but ignored -- the ASMSPEC in
- this case. */
- if (TREE_CODE (decl) == VAR_DECL
- && !DECL_REGISTER (decl)
- && !TREE_STATIC (decl))
- warning_with_decl (decl,
- "ignoring asm-specifier for non-static local variable `%s'");
- else
- SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
+ DECL_HARD_REGISTER (decl) = 1;
+ /* This cannot be done for a structure with volatile
+ fields, on which DECL_REGISTER will have been
+ reset. */
+ if (!DECL_REGISTER (decl))
+ error ("cannot put object with volatile field into register");
}
if (TREE_CODE (decl) != FUNCTION_DECL)
- add_decl_stmt (decl);
+ {
+ /* If we're building a variable sized type, and we might be
+ reachable other than via the top of the current binding
+ level, then create a new BIND_EXPR so that we deallocate
+ the object at the right time. */
+ /* Note that DECL_SIZE can be null due to errors. */
+ if (DECL_SIZE (decl)
+ && !TREE_CONSTANT (DECL_SIZE (decl))
+ && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
+ {
+ tree bind;
+ bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
+ TREE_SIDE_EFFECTS (bind) = 1;
+ add_stmt (bind);
+ BIND_EXPR_BODY (bind) = push_stmt_list ();
+ }
+ add_stmt (build_stmt (DECL_EXPR, decl));
+ }
}
- if (DECL_CONTEXT (decl) != 0)
+
+ if (!DECL_FILE_SCOPE_P (decl))
{
/* Recompute the RTL of a local array now
if it used to be an incomplete type. */
if (was_incomplete
- && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
+ && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
{
/* If we used it already as memory, it must stay in memory. */
TREE_ADDRESSABLE (decl) = TREE_USED (decl);
if (TREE_CODE (decl) == TYPE_DECL)
{
- /* This is a no-op in c-lang.c or something real in objc-actions.c. */
- maybe_objc_check_decl (decl);
- rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
+ if (!DECL_FILE_SCOPE_P (decl)
+ && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
+ add_stmt (build_stmt (DECL_EXPR, decl));
+
+ rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
}
/* At the end of a declaration, throw away any variable type sizes
of types defined inside that declaration. There is no use
computing them in the following function definition. */
- if (current_binding_level == global_binding_level)
+ if (current_scope == file_scope)
get_pending_sizes ();
+
+ /* Install a cleanup (aka destructor) if one was given. */
+ if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
+ {
+ tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
+ if (attr)
+ {
+ tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
+ tree cleanup_decl = lookup_name (cleanup_id);
+ tree cleanup;
+
+ /* Build "cleanup(&decl)" for the destructor. */
+ cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
+ cleanup = build_tree_list (NULL_TREE, cleanup);
+ cleanup = build_function_call (cleanup_decl, cleanup);
+
+ /* Don't warn about decl unused; the cleanup uses it. */
+ TREE_USED (decl) = 1;
+ TREE_USED (cleanup_decl) = 1;
+
+ /* Initialize EH, if we've been told to do so. */
+ c_maybe_initialize_eh ();
+
+ push_cleanup (decl, cleanup, false);
+ }
+ }
}
-/* If DECL has a cleanup, build and return that cleanup here.
- This is a callback called by expand_expr. */
+/* Given a parsed parameter declaration, decode it into a PARM_DECL. */
tree
-maybe_build_cleanup (decl)
- tree decl ATTRIBUTE_UNUSED;
+grokparm (const struct c_parm *parm)
{
- /* There are no cleanups in C. */
- return NULL_TREE;
+ tree attrs = parm->attrs;
+ tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
+ NULL, &attrs, DEPRECATED_NORMAL);
+
+ decl_attributes (&decl, attrs, 0);
+
+ return decl;
}
-/* Given a parsed parameter declaration,
- decode it into a PARM_DECL and push that on the current binding level.
- Also, for the sake of forward parm decls,
- record the given order of parms in `parm_order'. */
+/* Given a parsed parameter declaration, decode it into a PARM_DECL
+ and push that on the current scope. */
void
-push_parm_decl (parm)
- tree parm;
+push_parm_decl (const struct c_parm *parm)
{
+ tree attrs = parm->attrs;
tree decl;
- int old_immediate_size_expand = immediate_size_expand;
- /* Don't try computing parm sizes now -- wait till fn is called. */
- immediate_size_expand = 0;
- decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
- TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
- decl_attributes (&decl, TREE_VALUE (parm), 0);
-
-#if 0
- if (DECL_NAME (decl))
- {
- tree olddecl;
- olddecl = lookup_name (DECL_NAME (decl));
- if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
- pedwarn_with_decl (decl,
- "ISO C forbids parameter `%s' shadowing typedef");
- }
-#endif
+ decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
+ &attrs, DEPRECATED_NORMAL);
+ decl_attributes (&decl, attrs, 0);
decl = pushdecl (decl);
- immediate_size_expand = old_immediate_size_expand;
-
- current_binding_level->parm_order
- = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
-
- /* Add this decl to the current binding level. */
finish_decl (decl, NULL_TREE, NULL_TREE);
}
-/* Clear the given order of parms in `parm_order'.
- Used at start of parm list,
- and also at semicolon terminating forward decls. */
+/* Mark all the parameter declarations to date as forward decls.
+ Also diagnose use of this extension. */
void
-clear_parm_order ()
+mark_forward_parm_decls (void)
{
- current_binding_level->parm_order = NULL_TREE;
+ struct c_binding *b;
+
+ if (pedantic && !current_scope->warned_forward_parm_decls)
+ {
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C forbids forward parameter declarations");
+ current_scope->warned_forward_parm_decls = true;
+ }
+
+ for (b = current_scope->bindings; b; b = b->prev)
+ if (TREE_CODE (b->decl) == PARM_DECL)
+ TREE_ASM_WRITTEN (b->decl) = 1;
}
\f
/* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
literal. */
tree
-build_compound_literal (type, init)
- tree type;
- tree init;
+build_compound_literal (tree type, tree init)
{
/* We do not use start_decl here because we have a type, not a declarator;
and do not use finish_decl because the decl should be stored inside
- the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
- tree decl = build_decl (VAR_DECL, NULL_TREE, type);
+ the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
+ tree decl;
tree complit;
tree stmt;
+
+ if (type == error_mark_node)
+ return error_mark_node;
+
+ decl = build_decl (VAR_DECL, NULL_TREE, type);
DECL_EXTERNAL (decl) = 0;
TREE_PUBLIC (decl) = 0;
- TREE_STATIC (decl) = (current_binding_level == global_binding_level);
+ TREE_STATIC (decl) = (current_scope == file_scope);
DECL_CONTEXT (decl) = current_function_decl;
TREE_USED (decl) = 1;
TREE_TYPE (decl) = type;
- TREE_READONLY (decl) = TREE_READONLY (type);
+ TREE_READONLY (decl) = TYPE_READONLY (type);
store_init_value (decl, init);
if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
{
- int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
- if (failure)
- abort ();
+ int failure = complete_array_type (&TREE_TYPE (decl),
+ DECL_INITIAL (decl), true);
+ gcc_assert (!failure);
+
+ type = TREE_TYPE (decl);
+ TREE_TYPE (DECL_INITIAL (decl)) = type;
}
- type = TREE_TYPE (decl);
if (type == error_mark_node || !COMPLETE_TYPE_P (type))
return error_mark_node;
- stmt = build_stmt (DECL_STMT, decl);
- complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
+ stmt = build_stmt (DECL_EXPR, decl);
+ complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
TREE_SIDE_EFFECTS (complit) = 1;
layout_decl (decl, 0);
if (TREE_STATIC (decl))
{
- /* This decl needs a name for the assembler output. We also need
- a unique suffix to be added to the name. */
- char *name;
- extern int var_labelno;
-
- ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal", var_labelno);
- var_labelno++;
- DECL_NAME (decl) = get_identifier (name);
+ /* This decl needs a name for the assembler output. */
+ set_compound_literal_name (decl);
DECL_DEFER_OUTPUT (decl) = 1;
DECL_COMDAT (decl) = 1;
DECL_ARTIFICIAL (decl) = 1;
+ DECL_IGNORED_P (decl) = 1;
pushdecl (decl);
- rest_of_decl_compilation (decl, NULL, 1, 0);
+ rest_of_decl_compilation (decl, 1, 0);
}
return complit;
}
\f
-/* Make TYPE a complete type based on INITIAL_VALUE.
- Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
- 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
+/* Determine whether TYPE is a structure with a flexible array member,
+ or a union containing such a structure (possibly recursively). */
-int
-complete_array_type (type, initial_value, do_default)
- tree type;
- tree initial_value;
- int do_default;
+static bool
+flexible_array_type_p (tree type)
{
- tree maxindex = NULL_TREE;
- int value = 0;
-
- if (initial_value)
- {
- /* Note MAXINDEX is really the maximum index,
- one less than the size. */
- if (TREE_CODE (initial_value) == STRING_CST)
+ tree x;
+ switch (TREE_CODE (type))
+ {
+ case RECORD_TYPE:
+ x = TYPE_FIELDS (type);
+ if (x == NULL_TREE)
+ return false;
+ while (TREE_CHAIN (x) != NULL_TREE)
+ x = TREE_CHAIN (x);
+ if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
+ && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
+ && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
+ && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
+ return true;
+ return false;
+ case UNION_TYPE:
+ for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
{
- int eltsize
- = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
- maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
- / eltsize) - 1, 0);
+ if (flexible_array_type_p (TREE_TYPE (x)))
+ return true;
}
- else if (TREE_CODE (initial_value) == CONSTRUCTOR)
+ return false;
+ default:
+ return false;
+ }
+}
+\f
+/* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
+ replacing with appropriate values if they are invalid. */
+static void
+check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
+{
+ tree type_mv;
+ unsigned int max_width;
+ unsigned HOST_WIDE_INT w;
+ const char *name = orig_name ? orig_name: _("<anonymous>");
+
+ /* Detect and ignore out of range field width and process valid
+ field widths. */
+ if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
+ || TREE_CODE (*width) != INTEGER_CST)
+ {
+ error ("bit-field %qs width not an integer constant", name);
+ *width = integer_one_node;
+ }
+ else
+ {
+ constant_expression_warning (*width);
+ if (tree_int_cst_sgn (*width) < 0)
{
- tree elts = CONSTRUCTOR_ELTS (initial_value);
- maxindex = build_int_2 (-1, -1);
- for (; elts; elts = TREE_CHAIN (elts))
- {
- if (TREE_PURPOSE (elts))
- maxindex = TREE_PURPOSE (elts);
- else
- maxindex = fold (build (PLUS_EXPR, integer_type_node,
- maxindex, integer_one_node));
- }
- maxindex = copy_node (maxindex);
+ error ("negative width in bit-field %qs", name);
+ *width = integer_one_node;
}
- else
+ else if (integer_zerop (*width) && orig_name)
{
- /* Make an error message unless that happened already. */
- if (initial_value != error_mark_node)
- value = 1;
-
- /* Prevent further error messages. */
- maxindex = build_int_2 (0, 0);
+ error ("zero width for bit-field %qs", name);
+ *width = integer_one_node;
}
}
- if (!maxindex)
+ /* Detect invalid bit-field type. */
+ if (TREE_CODE (*type) != INTEGER_TYPE
+ && TREE_CODE (*type) != BOOLEAN_TYPE
+ && TREE_CODE (*type) != ENUMERAL_TYPE)
{
- if (do_default)
- maxindex = build_int_2 (0, 0);
- value = 2;
+ error ("bit-field %qs has invalid type", name);
+ *type = unsigned_type_node;
}
- if (maxindex)
- {
- TYPE_DOMAIN (type) = build_index_type (maxindex);
- if (!TREE_TYPE (maxindex))
- TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
- }
+ type_mv = TYPE_MAIN_VARIANT (*type);
+ if (!in_system_header
+ && type_mv != integer_type_node
+ && type_mv != unsigned_type_node
+ && type_mv != boolean_type_node)
+ pedwarn (input_location, OPT_pedantic,
+ "type of bit-field %qs is a GCC extension", name);
- /* Lay out the type now that we can get the real answer. */
+ max_width = TYPE_PRECISION (*type);
- layout_type (type);
+ if (0 < compare_tree_int (*width, max_width))
+ {
+ error ("width of %qs exceeds its type", name);
+ w = max_width;
+ *width = build_int_cst (NULL_TREE, w);
+ }
+ else
+ w = tree_low_cst (*width, 1);
- return value;
+ if (TREE_CODE (*type) == ENUMERAL_TYPE)
+ {
+ struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
+ if (!lt
+ || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
+ || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
+ warning (0, "%qs is narrower than values of its type", name);
+ }
}
+
\f
-/* Given declspecs and a declarator,
- determine the name and type of the object declared
- and construct a ..._DECL node for it.
- (In one case we can return a ..._TYPE node instead.
- For invalid input we sometimes return 0.)
- DECLSPECS is a chain of tree_list nodes whose value fields
- are the storage classes and type specifiers.
+/* Print warning about variable length array if necessary. */
+
+static void
+warn_variable_length_array (const char *name, tree size)
+{
+ int const_size = TREE_CONSTANT (size);
+
+ if (!flag_isoc99 && pedantic && warn_vla != 0)
+ {
+ if (const_size)
+ {
+ if (name)
+ pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array %qs whose size "
+ "can%'t be evaluated",
+ name);
+ else
+ pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
+ "can%'t be evaluated");
+ }
+ else
+ {
+ if (name)
+ pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array %qs",
+ name);
+ else
+ pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
+ }
+ }
+ else if (warn_vla > 0)
+ {
+ if (const_size)
+ {
+ if (name)
+ warning (OPT_Wvla,
+ "the size of array %qs can"
+ "%'t be evaluated", name);
+ else
+ warning (OPT_Wvla,
+ "the size of array can %'t be evaluated");
+ }
+ else
+ {
+ if (name)
+ warning (OPT_Wvla,
+ "variable length array %qs is used",
+ name);
+ else
+ warning (OPT_Wvla,
+ "variable length array is used");
+ }
+ }
+}
+
+/* Given declspecs and a declarator,
+ determine the name and type of the object declared
+ and construct a ..._DECL node for it.
+ (In one case we can return a ..._TYPE node instead.
+ For invalid input we sometimes return 0.)
+
+ DECLSPECS is a c_declspecs structure for the declaration specifiers.
DECL_CONTEXT says which syntactic context this declaration is in:
NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
TYPENAME if for a typename (in a cast or sizeof).
Don't make a DECL node; just return the ..._TYPE node.
FIELD for a struct or union field; make a FIELD_DECL.
- BITFIELD for a field with specified width.
- INITIALIZED is 1 if the decl has an initializer.
+ INITIALIZED is true if the decl has an initializer.
+ WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
+ representing the width of the bit-field.
+ DECL_ATTRS points to the list of attributes that should be added to this
+ decl. Any nested attributes that belong on the decl itself will be
+ added to this list.
+ DEPRECATED_STATE is a deprecated_states value indicating whether
+ deprecation warnings should be suppressed.
In the TYPENAME case, DECLARATOR is really an absolute declarator.
It may also be so in the PARM case, for a prototype where the
and `extern' are interpreted. */
static tree
-grokdeclarator (declarator, declspecs, decl_context, initialized)
- tree declspecs;
- tree declarator;
- enum decl_context decl_context;
- int initialized;
+grokdeclarator (const struct c_declarator *declarator,
+ struct c_declspecs *declspecs,
+ enum decl_context decl_context, bool initialized, tree *width,
+ tree *decl_attrs, enum deprecated_states deprecated_state)
{
- int specbits = 0;
- tree spec;
- tree type = NULL_TREE;
- int longlong = 0;
+ tree type = declspecs->type;
+ bool threadp = declspecs->thread_p;
+ enum c_storage_class storage_class = declspecs->storage_class;
int constp;
int restrictp;
int volatilep;
int type_quals = TYPE_UNQUALIFIED;
- int inlinep;
- int explicit_int = 0;
- int explicit_char = 0;
- int defaulted_int = 0;
- tree typedef_decl = 0;
- const char *name;
- tree typedef_type = 0;
- int funcdef_flag = 0;
- enum tree_code innermost_code = ERROR_MARK;
- int bitfield = 0;
+ const char *name, *orig_name;
+ bool funcdef_flag = false;
+ bool funcdef_syntax = false;
int size_varies = 0;
- tree decl_attr = NULL_TREE;
- tree array_ptr_quals = NULL_TREE;
+ tree decl_attr = declspecs->decl_attr;
+ int array_ptr_quals = TYPE_UNQUALIFIED;
+ tree array_ptr_attrs = NULL_TREE;
int array_parm_static = 0;
+ bool array_parm_vla_unspec_p = false;
tree returned_attrs = NULL_TREE;
-
- if (decl_context == BITFIELD)
- bitfield = 1, decl_context = FIELD;
+ bool bitfield = width != NULL;
+ tree element_type;
+ struct c_arg_info *arg_info = 0;
if (decl_context == FUNCDEF)
- funcdef_flag = 1, decl_context = NORMAL;
+ funcdef_flag = true, decl_context = NORMAL;
/* Look inside a declarator for the name being declared
and get it as a string, for an error message. */
{
- tree decl = declarator;
+ const struct c_declarator *decl = declarator;
name = 0;
while (decl)
- switch (TREE_CODE (decl))
+ switch (decl->kind)
{
- case ARRAY_REF:
- case INDIRECT_REF:
- case CALL_EXPR:
- innermost_code = TREE_CODE (decl);
- decl = TREE_OPERAND (decl, 0);
+ case cdk_function:
+ case cdk_array:
+ case cdk_pointer:
+ funcdef_syntax = (decl->kind == cdk_function);
+ decl = decl->declarator;
break;
- case TREE_LIST:
- decl = TREE_VALUE (decl);
+ case cdk_attrs:
+ decl = decl->declarator;
break;
- case IDENTIFIER_NODE:
- name = IDENTIFIER_POINTER (decl);
+ case cdk_id:
+ if (decl->u.id)
+ name = IDENTIFIER_POINTER (decl->u.id);
decl = 0;
break;
default:
- abort ();
+ gcc_unreachable ();
}
+ orig_name = name;
if (name == 0)
name = "type name";
}
/* A function definition's declarator must have the form of
a function declarator. */
- if (funcdef_flag && innermost_code != CALL_EXPR)
+ if (funcdef_flag && !funcdef_syntax)
return 0;
- /* Anything declared one level down from the top level
- must be one of the parameters of a function
- (because the body is at least two levels down). */
-
/* If this looks like a function definition, make it one,
even if it occurs where parms are expected.
Then store_parm_decls will reject it and not use it as a parm. */
- if (decl_context == NORMAL && !funcdef_flag
- && current_binding_level->parm_flag)
+ if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
decl_context = PARM;
- /* Look through the decl specs and record which ones appear.
- Some typespecs are defined as built-in typenames.
- Others, the ones that are modifiers of other types,
- are represented by bits in SPECBITS: set the bits for
- the modifiers that appear. Storage class keywords are also in SPECBITS.
-
- If there is a typedef name or a type, store the type in TYPE.
- This includes builtin typedefs such as `int'.
-
- Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
- and did not come from a user typedef.
-
- Set LONGLONG if `long' is mentioned twice. */
-
- for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
- {
- tree id = TREE_VALUE (spec);
-
- /* If the entire declaration is itself tagged as deprecated then
- suppress reports of deprecated items. */
- if (id && TREE_DEPRECATED (id))
- {
- if (deprecated_state != DEPRECATED_SUPPRESS)
- warn_deprecated_use (id);
- }
-
- if (id == ridpointers[(int) RID_INT])
- explicit_int = 1;
- if (id == ridpointers[(int) RID_CHAR])
- explicit_char = 1;
-
- if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
- {
- enum rid i = C_RID_CODE (id);
- if ((int) i <= (int) RID_LAST_MODIFIER)
- {
- if (i == RID_LONG && (specbits & (1 << (int) i)))
- {
- if (longlong)
- error ("`long long long' is too long for GCC");
- else
- {
- if (pedantic && !flag_isoc99 && ! in_system_header
- && warn_long_long)
- pedwarn ("ISO C89 does not support `long long'");
- longlong = 1;
- }
- }
- else if (specbits & (1 << (int) i))
- pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
- specbits |= 1 << (int) i;
- goto found;
- }
- }
- if (type)
- error ("two or more data types in declaration of `%s'", name);
- /* Actual typedefs come to us as TYPE_DECL nodes. */
- else if (TREE_CODE (id) == TYPE_DECL)
- {
- if (TREE_TYPE (id) == error_mark_node)
- ; /* Allow the type to default to int to avoid cascading errors. */
- else
- {
- type = TREE_TYPE (id);
- decl_attr = DECL_ATTRIBUTES (id);
- typedef_decl = id;
- }
- }
- /* Built-in types come as identifiers. */
- else if (TREE_CODE (id) == IDENTIFIER_NODE)
- {
- tree t = lookup_name (id);
- if (TREE_TYPE (t) == error_mark_node)
- ;
- else if (!t || TREE_CODE (t) != TYPE_DECL)
- error ("`%s' fails to be a typedef or built in type",
- IDENTIFIER_POINTER (id));
- else
- {
- type = TREE_TYPE (t);
- typedef_decl = t;
- }
- }
- else if (TREE_CODE (id) != ERROR_MARK)
- type = id;
-
- found:
- ;
- }
-
- typedef_type = type;
- if (type)
- size_varies = C_TYPE_VARIABLE_SIZE (type);
-
- /* No type at all: default to `int', and set DEFAULTED_INT
- because it was not a user-defined typedef. */
+ if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
+ warn_deprecated_use (declspecs->type);
- if (type == 0)
+ if ((decl_context == NORMAL || decl_context == FIELD)
+ && current_scope == file_scope
+ && variably_modified_type_p (type, NULL_TREE))
{
- if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
- | (1 << (int) RID_SIGNED)
- | (1 << (int) RID_UNSIGNED)
- | (1 << (int) RID_COMPLEX))))
- /* Don't warn about typedef foo = bar. */
- && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
- && ! in_system_header)
- {
- /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
- and this is a function, or if -Wimplicit; prefer the former
- warning since it is more explicit. */
- if ((warn_implicit_int || warn_return_type || flag_isoc99)
- && funcdef_flag)
- warn_about_return_type = 1;
- else if (warn_implicit_int || flag_isoc99)
- pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
- name);
- }
-
- defaulted_int = 1;
+ error ("variably modified %qs at file scope", name);
type = integer_type_node;
}
- /* Now process the modifiers that were specified
- and check for invalid combinations. */
+ size_varies = C_TYPE_VARIABLE_SIZE (type);
- /* Long double is a special combination. */
+ /* Diagnose defaulting to "int". */
- if ((specbits & 1 << (int) RID_LONG) && ! longlong
- && TYPE_MAIN_VARIANT (type) == double_type_node)
+ if (declspecs->default_int_p && !in_system_header)
{
- specbits &= ~(1 << (int) RID_LONG);
- type = long_double_type_node;
+ /* Issue a warning if this is an ISO C 99 program or if
+ -Wreturn-type and this is a function, or if -Wimplicit;
+ prefer the former warning since it is more explicit. */
+ if ((warn_implicit_int || warn_return_type || flag_isoc99)
+ && funcdef_flag)
+ warn_about_return_type = 1;
+ else
+ pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
+ "type defaults to %<int%> in declaration of %qs", name);
}
- /* Check all other uses of type modifiers. */
+ /* Adjust the type if a bit-field is being declared,
+ -funsigned-bitfields applied and the type is not explicitly
+ "signed". */
+ if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
+ && TREE_CODE (type) == INTEGER_TYPE)
+ type = unsigned_type_for (type);
- if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
- | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
+ /* Figure out the type qualifiers for the declaration. There are
+ two ways a declaration can become qualified. One is something
+ like `const int i' where the `const' is explicit. Another is
+ something like `typedef const int CI; CI i' where the type of the
+ declaration contains the `const'. A third possibility is that
+ there is a type qualifier on the element type of a typedefed
+ array type, in which case we should extract that qualifier so
+ that c_apply_type_quals_to_decl receives the full list of
+ qualifiers to work with (C90 is not entirely clear about whether
+ duplicate qualifiers should be diagnosed in this case, but it
+ seems most appropriate to do so). */
+ element_type = strip_array_types (type);
+ constp = declspecs->const_p + TYPE_READONLY (element_type);
+ restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
+ volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
+ if (pedantic && !flag_isoc99)
{
- int ok = 0;
-
- if ((specbits & 1 << (int) RID_LONG)
- && (specbits & 1 << (int) RID_SHORT))
- error ("both long and short specified for `%s'", name);
- else if (((specbits & 1 << (int) RID_LONG)
- || (specbits & 1 << (int) RID_SHORT))
- && explicit_char)
- error ("long or short specified with char for `%s'", name);
- else if (((specbits & 1 << (int) RID_LONG)
- || (specbits & 1 << (int) RID_SHORT))
- && TREE_CODE (type) == REAL_TYPE)
- {
- static int already = 0;
+ if (constp > 1)
+ pedwarn (input_location, OPT_pedantic, "duplicate %<const%>");
+ if (restrictp > 1)
+ pedwarn (input_location, OPT_pedantic, "duplicate %<restrict%>");
+ if (volatilep > 1)
+ pedwarn (input_location, OPT_pedantic, "duplicate %<volatile%>");
+ }
+ if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
+ type = TYPE_MAIN_VARIANT (type);
+ type_quals = ((constp ? TYPE_QUAL_CONST : 0)
+ | (restrictp ? TYPE_QUAL_RESTRICT : 0)
+ | (volatilep ? TYPE_QUAL_VOLATILE : 0));
- error ("long or short specified with floating type for `%s'", name);
- if (! already && ! pedantic)
- {
- error ("the only valid combination is `long double'");
- already = 1;
- }
- }
- else if ((specbits & 1 << (int) RID_SIGNED)
- && (specbits & 1 << (int) RID_UNSIGNED))
- error ("both signed and unsigned specified for `%s'", name);
- else if (TREE_CODE (type) != INTEGER_TYPE)
- error ("long, short, signed or unsigned invalid for `%s'", name);
+ /* Warn about storage classes that are invalid for certain
+ kinds of declarations (parameters, typenames, etc.). */
+
+ if (funcdef_flag
+ && (threadp
+ || storage_class == csc_auto
+ || storage_class == csc_register
+ || storage_class == csc_typedef))
+ {
+ if (storage_class == csc_auto)
+ pedwarn (input_location,
+ (current_scope == file_scope) ? 0 : OPT_pedantic,
+ "function definition declared %<auto%>");
+ if (storage_class == csc_register)
+ error ("function definition declared %<register%>");
+ if (storage_class == csc_typedef)
+ error ("function definition declared %<typedef%>");
+ if (threadp)
+ error ("function definition declared %<__thread%>");
+ threadp = false;
+ if (storage_class == csc_auto
+ || storage_class == csc_register
+ || storage_class == csc_typedef)
+ storage_class = csc_none;
+ }
+ else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
+ {
+ if (decl_context == PARM && storage_class == csc_register)
+ ;
else
{
- ok = 1;
- if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
+ switch (decl_context)
{
- pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
- name);
- if (flag_pedantic_errors)
- ok = 0;
+ case FIELD:
+ error ("storage class specified for structure field %qs",
+ name);
+ break;
+ case PARM:
+ error ("storage class specified for parameter %qs", name);
+ break;
+ default:
+ error ("storage class specified for typename");
+ break;
}
- }
-
- /* Discard the type modifiers if they are invalid. */
- if (! ok)
- {
- specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
- | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
- longlong = 0;
+ storage_class = csc_none;
+ threadp = false;
}
}
-
- if ((specbits & (1 << (int) RID_COMPLEX))
- && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
- {
- error ("complex invalid for `%s'", name);
- specbits &= ~(1 << (int) RID_COMPLEX);
- }
-
- /* Decide whether an integer type is signed or not.
- Optionally treat bitfields as signed by default. */
- if (specbits & 1 << (int) RID_UNSIGNED
- /* Traditionally, all bitfields are unsigned. */
- || (bitfield && flag_traditional
- && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
- || (bitfield && ! flag_signed_bitfields
- && (explicit_int || defaulted_int || explicit_char
- /* A typedef for plain `int' without `signed'
- can be controlled just like plain `int'. */
- || ! (typedef_decl != 0
- && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
- && TREE_CODE (type) != ENUMERAL_TYPE
- && !(specbits & 1 << (int) RID_SIGNED)))
- {
- if (longlong)
- type = long_long_unsigned_type_node;
- else if (specbits & 1 << (int) RID_LONG)
- type = long_unsigned_type_node;
- else if (specbits & 1 << (int) RID_SHORT)
- type = short_unsigned_type_node;
- else if (type == char_type_node)
- type = unsigned_char_type_node;
- else if (typedef_decl)
- type = unsigned_type (type);
- else
- type = unsigned_type_node;
- }
- else if ((specbits & 1 << (int) RID_SIGNED)
- && type == char_type_node)
- type = signed_char_type_node;
- else if (longlong)
- type = long_long_integer_type_node;
- else if (specbits & 1 << (int) RID_LONG)
- type = long_integer_type_node;
- else if (specbits & 1 << (int) RID_SHORT)
- type = short_integer_type_node;
-
- if (specbits & 1 << (int) RID_COMPLEX)
- {
- if (pedantic && !flag_isoc99)
- pedwarn ("ISO C89 does not support complex types");
- /* If we just have "complex", it is equivalent to
- "complex double", but if any modifiers at all are specified it is
- the complex form of TYPE. E.g, "complex short" is
- "complex short int". */
-
- if (defaulted_int && ! longlong
- && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
- | (1 << (int) RID_SIGNED)
- | (1 << (int) RID_UNSIGNED))))
- {
- if (pedantic)
- pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
- type = complex_double_type_node;
- }
- else if (type == integer_type_node)
- {
- if (pedantic)
- pedwarn ("ISO C does not support complex integer types");
- type = complex_integer_type_node;
- }
- else if (type == float_type_node)
- type = complex_float_type_node;
- else if (type == double_type_node)
- type = complex_double_type_node;
- else if (type == long_double_type_node)
- type = complex_long_double_type_node;
+ else if (storage_class == csc_extern
+ && initialized
+ && !funcdef_flag)
+ {
+ /* 'extern' with initialization is invalid if not at file scope. */
+ if (current_scope == file_scope)
+ {
+ /* It is fine to have 'extern const' when compiling at C
+ and C++ intersection. */
+ if (!(warn_cxx_compat && constp))
+ warning (0, "%qs initialized and declared %<extern%>", name);
+ }
else
+ error ("%qs has both %<extern%> and initializer", name);
+ }
+ else if (current_scope == file_scope)
+ {
+ if (storage_class == csc_auto)
+ error ("file-scope declaration of %qs specifies %<auto%>", name);
+ if (pedantic && storage_class == csc_register)
+ pedwarn (input_location, OPT_pedantic,
+ "file-scope declaration of %qs specifies %<register%>", name);
+ }
+ else
+ {
+ if (storage_class == csc_extern && funcdef_flag)
+ error ("nested function %qs declared %<extern%>", name);
+ else if (threadp && storage_class == csc_none)
{
- if (pedantic)
- pedwarn ("ISO C does not support complex integer types");
- type = build_complex_type (type);
+ error ("function-scope %qs implicitly auto and declared "
+ "%<__thread%>",
+ name);
+ threadp = false;
}
}
- /* Figure out the type qualifiers for the declaration. There are
- two ways a declaration can become qualified. One is something
- like `const int i' where the `const' is explicit. Another is
- something like `typedef const int CI; CI i' where the type of the
- declaration contains the `const'. */
- constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
- restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
- volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
- inlinep = !! (specbits & (1 << (int) RID_INLINE));
- if (constp > 1 && ! flag_isoc99)
- pedwarn ("duplicate `const'");
- if (restrictp > 1 && ! flag_isoc99)
- pedwarn ("duplicate `restrict'");
- if (volatilep > 1 && ! flag_isoc99)
- pedwarn ("duplicate `volatile'");
- if (! flag_gen_aux_info && (TYPE_QUALS (type)))
- type = TYPE_MAIN_VARIANT (type);
- type_quals = ((constp ? TYPE_QUAL_CONST : 0)
- | (restrictp ? TYPE_QUAL_RESTRICT : 0)
- | (volatilep ? TYPE_QUAL_VOLATILE : 0));
-
- /* Warn if two storage classes are given. Default to `auto'. */
-
- {
- int nclasses = 0;
-
- if (specbits & 1 << (int) RID_AUTO) nclasses++;
- if (specbits & 1 << (int) RID_STATIC) nclasses++;
- if (specbits & 1 << (int) RID_EXTERN) nclasses++;
- if (specbits & 1 << (int) RID_REGISTER) nclasses++;
- if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
-
- /* Warn about storage classes that are invalid for certain
- kinds of declarations (parameters, typenames, etc.). */
-
- if (nclasses > 1)
- error ("multiple storage classes in declaration of `%s'", name);
- else if (funcdef_flag
- && (specbits
- & ((1 << (int) RID_REGISTER)
- | (1 << (int) RID_AUTO)
- | (1 << (int) RID_TYPEDEF))))
- {
- if (specbits & 1 << (int) RID_AUTO
- && (pedantic || current_binding_level == global_binding_level))
- pedwarn ("function definition declared `auto'");
- if (specbits & 1 << (int) RID_REGISTER)
- error ("function definition declared `register'");
- if (specbits & 1 << (int) RID_TYPEDEF)
- error ("function definition declared `typedef'");
- specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
- | (1 << (int) RID_AUTO));
- }
- else if (decl_context != NORMAL && nclasses > 0)
- {
- if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
- ;
- else
- {
- switch (decl_context)
- {
- case FIELD:
- error ("storage class specified for structure field `%s'",
- name);
- break;
- case PARM:
- error ("storage class specified for parameter `%s'", name);
- break;
- default:
- error ("storage class specified for typename");
- break;
- }
- specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
- | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
- | (1 << (int) RID_EXTERN));
- }
- }
- else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
- {
- /* `extern' with initialization is invalid if not at top level. */
- if (current_binding_level == global_binding_level)
- warning ("`%s' initialized and declared `extern'", name);
- else
- error ("`%s' has both `extern' and initializer", name);
- }
- else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
- && current_binding_level != global_binding_level)
- error ("nested function `%s' declared `extern'", name);
- else if (current_binding_level == global_binding_level
- && specbits & (1 << (int) RID_AUTO))
- error ("top-level declaration of `%s' specifies `auto'", name);
- }
-
/* Now figure out the structure of the declarator proper.
Descend through it, creating more complex types, until we reach
- the declared identifier (or NULL_TREE, in an absolute declarator). */
+ the declared identifier (or NULL_TREE, in an absolute declarator).
+ At each stage we maintain an unqualified version of the type
+ together with any qualifiers that should be applied to it with
+ c_build_qualified_type; this way, array types including
+ multidimensional array types are first built up in unqualified
+ form and then the qualified form is created with
+ TYPE_MAIN_VARIANT pointing to the unqualified form. */
- while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
+ while (declarator && declarator->kind != cdk_id)
{
if (type == error_mark_node)
{
- declarator = TREE_OPERAND (declarator, 0);
+ declarator = declarator->declarator;
continue;
}
- /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
- an INDIRECT_REF (for *...),
- a CALL_EXPR (for ...(...)),
- a TREE_LIST (for nested attributes),
- an identifier (for the name being declared)
- or a null pointer (for the place in an absolute declarator
+ /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
+ a cdk_pointer (for *...),
+ a cdk_function (for ...(...)),
+ a cdk_attrs (for nested attributes),
+ or a cdk_id (for the name being declared
+ or the place in an absolute declarator
where the name was omitted).
- For the last two cases, we have just exited the loop.
+ For the last case, we have just exited the loop.
At this point, TYPE is the type of elements of an array,
or for a function to return, or for a pointer to point to.
array or function or pointer, and DECLARATOR has had its
outermost layer removed. */
- if (array_ptr_quals != NULL_TREE || array_parm_static)
+ if (array_ptr_quals != TYPE_UNQUALIFIED
+ || array_ptr_attrs != NULL_TREE
+ || array_parm_static)
{
/* Only the innermost declarator (making a parameter be of
array type which is converted to pointer type)
may have static or type qualifiers. */
error ("static or type qualifiers in non-parameter array declarator");
- array_ptr_quals = NULL_TREE;
+ array_ptr_quals = TYPE_UNQUALIFIED;
+ array_ptr_attrs = NULL_TREE;
array_parm_static = 0;
}
- if (TREE_CODE (declarator) == TREE_LIST)
- {
- /* We encode a declarator with embedded attributes using
- a TREE_LIST. */
- tree attrs = TREE_PURPOSE (declarator);
- tree inner_decl;
- int attr_flags = 0;
- declarator = TREE_VALUE (declarator);
- inner_decl = declarator;
- while (inner_decl != NULL_TREE
- && TREE_CODE (inner_decl) == TREE_LIST)
- inner_decl = TREE_VALUE (inner_decl);
- if (inner_decl == NULL_TREE
- || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
- attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
- else if (TREE_CODE (inner_decl) == CALL_EXPR)
- attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
- else if (TREE_CODE (inner_decl) == ARRAY_REF)
- attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
- returned_attrs = decl_attributes (&type,
- chainon (returned_attrs, attrs),
- attr_flags);
- }
- else if (TREE_CODE (declarator) == ARRAY_REF)
+ switch (declarator->kind)
{
- tree itype = NULL_TREE;
- tree size = TREE_OPERAND (declarator, 1);
- /* The index is a signed object `sizetype' bits wide. */
- tree index_type = signed_type (sizetype);
-
- array_ptr_quals = TREE_TYPE (declarator);
- array_parm_static = TREE_STATIC (declarator);
-
- declarator = TREE_OPERAND (declarator, 0);
+ case cdk_attrs:
+ {
+ /* A declarator with embedded attributes. */
+ tree attrs = declarator->u.attrs;
+ const struct c_declarator *inner_decl;
+ int attr_flags = 0;
+ declarator = declarator->declarator;
+ inner_decl = declarator;
+ while (inner_decl->kind == cdk_attrs)
+ inner_decl = inner_decl->declarator;
+ if (inner_decl->kind == cdk_id)
+ attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
+ else if (inner_decl->kind == cdk_function)
+ attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
+ else if (inner_decl->kind == cdk_array)
+ attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
+ returned_attrs = decl_attributes (&type,
+ chainon (returned_attrs, attrs),
+ attr_flags);
+ break;
+ }
+ case cdk_array:
+ {
+ tree itype = NULL_TREE;
+ tree size = declarator->u.array.dimen;
+ /* The index is a signed object `sizetype' bits wide. */
+ tree index_type = c_common_signed_type (sizetype);
- /* Check for some types that there cannot be arrays of. */
+ array_ptr_quals = declarator->u.array.quals;
+ array_ptr_attrs = declarator->u.array.attrs;
+ array_parm_static = declarator->u.array.static_p;
+ array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
- if (VOID_TYPE_P (type))
- {
- error ("declaration of `%s' as array of voids", name);
- type = error_mark_node;
- }
+ declarator = declarator->declarator;
- if (TREE_CODE (type) == FUNCTION_TYPE)
- {
- error ("declaration of `%s' as array of functions", name);
- type = error_mark_node;
- }
+ /* Check for some types that there cannot be arrays of. */
- if (size == error_mark_node)
- type = error_mark_node;
+ if (VOID_TYPE_P (type))
+ {
+ error ("declaration of %qs as array of voids", name);
+ type = error_mark_node;
+ }
- if (type == error_mark_node)
- continue;
+ if (TREE_CODE (type) == FUNCTION_TYPE)
+ {
+ error ("declaration of %qs as array of functions", name);
+ type = error_mark_node;
+ }
- /* If size was specified, set ITYPE to a range-type for that size.
- Otherwise, ITYPE remains null. finish_decl may figure it out
- from an initial value. */
+ if (pedantic && !in_system_header && flexible_array_type_p (type))
+ pedwarn (input_location, OPT_pedantic,
+ "invalid use of structure with flexible array member");
- if (size)
- {
- /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
- STRIP_TYPE_NOPS (size);
+ if (size == error_mark_node)
+ type = error_mark_node;
- if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
- {
- error ("size of array `%s' has non-integer type", name);
- size = integer_one_node;
- }
+ if (type == error_mark_node)
+ continue;
- if (pedantic && integer_zerop (size))
- pedwarn ("ISO C forbids zero-size array `%s'", name);
+ /* If size was specified, set ITYPE to a range-type for
+ that size. Otherwise, ITYPE remains null. finish_decl
+ may figure it out from an initial value. */
- if (TREE_CODE (size) == INTEGER_CST)
- {
- constant_expression_warning (size);
- if (tree_int_cst_sgn (size) < 0)
- {
- error ("size of array `%s' is negative", name);
- size = integer_one_node;
- }
- }
- else
- {
- /* Make sure the array size remains visibly nonconstant
- even if it is (eg) a const variable with known value. */
- size_varies = 1;
+ if (size)
+ {
+ /* Strip NON_LVALUE_EXPRs since we aren't using as an
+ lvalue. */
+ STRIP_TYPE_NOPS (size);
- if (!flag_isoc99 && pedantic)
- {
- if (TREE_CONSTANT (size))
- pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
- name);
- else
- pedwarn ("ISO C89 forbids variable-size array `%s'",
- name);
- }
- }
+ if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
+ {
+ error ("size of array %qs has non-integer type", name);
+ size = integer_one_node;
+ }
- if (integer_zerop (size))
- {
- /* A zero-length array cannot be represented with an
- unsigned index type, which is what we'll get with
- build_index_type. Create an open-ended range instead. */
- itype = build_range_type (sizetype, size, NULL_TREE);
- }
- else
- {
- /* Compute the maximum valid index, that is, size - 1.
- Do the calculation in index_type, so that if it is
- a variable the computations will be done in the
- proper mode. */
- itype = fold (build (MINUS_EXPR, index_type,
- convert (index_type, size),
- convert (index_type, size_one_node)));
-
- /* If that overflowed, the array is too big.
- ??? While a size of INT_MAX+1 technically shouldn't
- cause an overflow (because we subtract 1), the overflow
- is recorded during the conversion to index_type, before
- the subtraction. Handling this case seems like an
- unnecessary complication. */
- if (TREE_OVERFLOW (itype))
- {
- error ("size of array `%s' is too large", name);
- type = error_mark_node;
- continue;
- }
+ if (pedantic && integer_zerop (size))
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C forbids zero-size array %qs", name);
- if (size_varies)
- itype = variable_size (itype);
- itype = build_index_type (itype);
- }
- }
- else if (decl_context == FIELD)
- {
- if (pedantic && !flag_isoc99 && !in_system_header)
- pedwarn ("ISO C89 does not support flexible array members");
+ if (TREE_CODE (size) == INTEGER_CST)
+ {
+ constant_expression_warning (size);
+ if (tree_int_cst_sgn (size) < 0)
+ {
+ error ("size of array %qs is negative", name);
+ size = integer_one_node;
+ }
+ }
+ else if ((decl_context == NORMAL || decl_context == FIELD)
+ && current_scope == file_scope)
+ {
+ error ("variably modified %qs at file scope", name);
+ size = integer_one_node;
+ }
+ else
+ {
+ /* Make sure the array size remains visibly
+ nonconstant even if it is (eg) a const variable
+ with known value. */
+ size_varies = 1;
+ warn_variable_length_array (orig_name, size);
+ }
- /* ISO C99 Flexible array members are effectively identical
- to GCC's zero-length array extension. */
- itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
- }
+ if (integer_zerop (size))
+ {
+ /* A zero-length array cannot be represented with
+ an unsigned index type, which is what we'll
+ get with build_index_type. Create an
+ open-ended range instead. */
+ itype = build_range_type (sizetype, size, NULL_TREE);
+ }
+ else
+ {
+ /* Arrange for the SAVE_EXPR on the inside of the
+ MINUS_EXPR, which allows the -1 to get folded
+ with the +1 that happens when building TYPE_SIZE. */
+ if (size_varies)
+ size = variable_size (size);
+
+ /* Compute the maximum valid index, that is, size
+ - 1. Do the calculation in index_type, so that
+ if it is a variable the computations will be
+ done in the proper mode. */
+ itype = fold_build2 (MINUS_EXPR, index_type,
+ convert (index_type, size),
+ convert (index_type,
+ size_one_node));
+
+ /* If that overflowed, the array is too big. ???
+ While a size of INT_MAX+1 technically shouldn't
+ cause an overflow (because we subtract 1), the
+ overflow is recorded during the conversion to
+ index_type, before the subtraction. Handling
+ this case seems like an unnecessary
+ complication. */
+ if (TREE_CODE (itype) == INTEGER_CST
+ && TREE_OVERFLOW (itype))
+ {
+ error ("size of array %qs is too large", name);
+ type = error_mark_node;
+ continue;
+ }
- /* If pedantic, complain about arrays of incomplete types. */
+ itype = build_index_type (itype);
+ }
+ }
+ else if (decl_context == FIELD)
+ {
+ bool flexible_array_member = false;
+ if (array_parm_vla_unspec_p)
+ /* Field names can in fact have function prototype
+ scope so [*] is disallowed here through making
+ the field variably modified, not through being
+ something other than a declaration with function
+ prototype scope. */
+ size_varies = 1;
+ else
+ {
+ const struct c_declarator *t = declarator;
+ while (t->kind == cdk_attrs)
+ t = t->declarator;
+ flexible_array_member = (t->kind == cdk_id);
+ }
+ if (flexible_array_member
+ && pedantic && !flag_isoc99 && !in_system_header)
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C90 does not support flexible array members");
+
+ /* ISO C99 Flexible array members are effectively
+ identical to GCC's zero-length array extension. */
+ if (flexible_array_member || array_parm_vla_unspec_p)
+ itype = build_range_type (sizetype, size_zero_node,
+ NULL_TREE);
+ }
+ else if (decl_context == PARM)
+ {
+ if (array_parm_vla_unspec_p)
+ {
+ itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
+ size_varies = 1;
+ }
+ }
+ else if (decl_context == TYPENAME)
+ {
+ if (array_parm_vla_unspec_p)
+ {
+ /* C99 6.7.5.2p4 */
+ warning (0, "%<[*]%> not in a declaration");
+ /* We use this to avoid messing up with incomplete
+ array types of the same type, that would
+ otherwise be modified below. */
+ itype = build_range_type (sizetype, size_zero_node,
+ NULL_TREE);
+ size_varies = 1;
+ }
+ }
- if (pedantic && !COMPLETE_TYPE_P (type))
- pedwarn ("array type has incomplete element type");
+ /* Complain about arrays of incomplete types. */
+ if (!COMPLETE_TYPE_P (type))
+ {
+ error ("array type has incomplete element type");
+ type = error_mark_node;
+ }
+ else
+ /* When itype is NULL, a shared incomplete array type is
+ returned for all array of a given type. Elsewhere we
+ make sure we don't complete that type before copying
+ it, but here we want to make sure we don't ever
+ modify the shared type, so we gcc_assert (itype)
+ below. */
+ type = build_array_type (type, itype);
+
+ if (type != error_mark_node)
+ {
+ if (size_varies)
+ {
+ /* It is ok to modify type here even if itype is
+ NULL: if size_varies, we're in a
+ multi-dimensional array and the inner type has
+ variable size, so the enclosing shared array type
+ must too. */
+ if (size && TREE_CODE (size) == INTEGER_CST)
+ type
+ = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
+ C_TYPE_VARIABLE_SIZE (type) = 1;
+ }
-#if 0
- /* We shouldn't have a function type here at all!
- Functions aren't allowed as array elements. */
- if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
- && (constp || volatilep))
- pedwarn ("ISO C forbids const or volatile function types");
-#endif
+ /* The GCC extension for zero-length arrays differs from
+ ISO flexible array members in that sizeof yields
+ zero. */
+ if (size && integer_zerop (size))
+ {
+ gcc_assert (itype);
+ TYPE_SIZE (type) = bitsize_zero_node;
+ TYPE_SIZE_UNIT (type) = size_zero_node;
+ }
+ if (array_parm_vla_unspec_p)
+ {
+ gcc_assert (itype);
+ /* The type is complete. C99 6.7.5.2p4 */
+ TYPE_SIZE (type) = bitsize_zero_node;
+ TYPE_SIZE_UNIT (type) = size_zero_node;
+ }
+ }
- /* Build the array type itself, then merge any constancy or
- volatility into the target type. We must do it in this order
- to ensure that the TYPE_MAIN_VARIANT field of the array type
- is set correctly. */
+ if (decl_context != PARM
+ && (array_ptr_quals != TYPE_UNQUALIFIED
+ || array_ptr_attrs != NULL_TREE
+ || array_parm_static))
+ {
+ error ("static or type qualifiers in non-parameter array declarator");
+ array_ptr_quals = TYPE_UNQUALIFIED;
+ array_ptr_attrs = NULL_TREE;
+ array_parm_static = 0;
+ }
+ break;
+ }
+ case cdk_function:
+ {
+ /* Say it's a definition only for the declarator closest
+ to the identifier, apart possibly from some
+ attributes. */
+ bool really_funcdef = false;
+ tree arg_types;
+ if (funcdef_flag)
+ {
+ const struct c_declarator *t = declarator->declarator;
+ while (t->kind == cdk_attrs)
+ t = t->declarator;
+ really_funcdef = (t->kind == cdk_id);
+ }
- type = build_array_type (type, itype);
- if (type_quals)
- type = c_build_qualified_type (type, type_quals);
+ /* Declaring a function type. Make sure we have a valid
+ type for the function to return. */
+ if (type == error_mark_node)
+ continue;
- if (size_varies)
- C_TYPE_VARIABLE_SIZE (type) = 1;
+ size_varies = 0;
- /* The GCC extension for zero-length arrays differs from
- ISO flexible array members in that sizeof yields zero. */
- if (size && integer_zerop (size))
- {
- layout_type (type);
- TYPE_SIZE (type) = bitsize_zero_node;
- TYPE_SIZE_UNIT (type) = size_zero_node;
- }
- if (decl_context != PARM
- && (array_ptr_quals != NULL_TREE || array_parm_static))
- {
- error ("static or type qualifiers in non-parameter array declarator");
- array_ptr_quals = NULL_TREE;
- array_parm_static = 0;
- }
- }
- else if (TREE_CODE (declarator) == CALL_EXPR)
- {
- tree arg_types;
+ /* Warn about some types functions can't return. */
+ if (TREE_CODE (type) == FUNCTION_TYPE)
+ {
+ error ("%qs declared as function returning a function", name);
+ type = integer_type_node;
+ }
+ if (TREE_CODE (type) == ARRAY_TYPE)
+ {
+ error ("%qs declared as function returning an array", name);
+ type = integer_type_node;
+ }
- /* Declaring a function type.
- Make sure we have a valid type for the function to return. */
- if (type == error_mark_node)
- continue;
+ /* Construct the function type and go to the next
+ inner layer of declarator. */
+ arg_info = declarator->u.arg_info;
+ arg_types = grokparms (arg_info, really_funcdef);
+ if (really_funcdef)
+ put_pending_sizes (arg_info->pending_sizes);
- size_varies = 0;
+ /* Type qualifiers before the return type of the function
+ qualify the return type, not the function type. */
+ if (type_quals)
+ {
+ /* Type qualifiers on a function return type are
+ normally permitted by the standard but have no
+ effect, so give a warning at -Wreturn-type.
+ Qualifiers on a void return type are banned on
+ function definitions in ISO C; GCC used to used
+ them for noreturn functions. */
+ if (VOID_TYPE_P (type) && really_funcdef)
+ pedwarn (input_location, 0,
+ "function definition has qualified void return type");
+ else
+ warning (OPT_Wignored_qualifiers,
+ "type qualifiers ignored on function return type");
+
+ type = c_build_qualified_type (type, type_quals);
+ }
+ type_quals = TYPE_UNQUALIFIED;
- /* Warn about some types functions can't return. */
+ type = build_function_type (type, arg_types);
+ declarator = declarator->declarator;
- if (TREE_CODE (type) == FUNCTION_TYPE)
- {
- error ("`%s' declared as function returning a function", name);
- type = integer_type_node;
- }
- if (TREE_CODE (type) == ARRAY_TYPE)
+ /* Set the TYPE_CONTEXTs for each tagged type which is local to
+ the formal parameter list of this FUNCTION_TYPE to point to
+ the FUNCTION_TYPE node itself. */
{
- error ("`%s' declared as function returning an array", name);
- type = integer_type_node;
- }
+ tree link;
-#ifndef TRADITIONAL_RETURN_FLOAT
- /* Traditionally, declaring return type float means double. */
-
- if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
- type = double_type_node;
-#endif /* TRADITIONAL_RETURN_FLOAT */
-
- /* Construct the function type and go to the next
- inner layer of declarator. */
-
- arg_types = grokparms (TREE_OPERAND (declarator, 1),
- funcdef_flag
- /* Say it's a definition
- only for the CALL_EXPR
- closest to the identifier. */
- && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
- /* Type qualifiers before the return type of the function
- qualify the return type, not the function type. */
- if (type_quals)
- {
- /* Type qualifiers on a function return type are normally
- permitted by the standard but have no effect, so give a
- warning at -W. Qualifiers on a void return type have
- meaning as a GNU extension, and are banned on function
- definitions in ISO C. FIXME: strictly we shouldn't
- pedwarn for qualified void return types except on function
- definitions, but not doing so could lead to the undesirable
- state of a "volatile void" function return type not being
- warned about, and a use of the function being compiled
- with GNU semantics, with no diagnostics under -pedantic. */
- if (VOID_TYPE_P (type) && pedantic && !in_system_header)
- pedwarn ("ISO C forbids qualified void function return type");
- else if (extra_warnings
- && !(VOID_TYPE_P (type)
- && type_quals == TYPE_QUAL_VOLATILE))
- warning ("type qualifiers ignored on function return type");
+ for (link = arg_info->tags;
+ link;
+ link = TREE_CHAIN (link))
+ TYPE_CONTEXT (TREE_VALUE (link)) = type;
+ }
+ break;
+ }
+ case cdk_pointer:
+ {
+ /* Merge any constancy or volatility into the target type
+ for the pointer. */
+ if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
+ && type_quals)
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C forbids qualified function types");
+ if (type_quals)
type = c_build_qualified_type (type, type_quals);
- }
- type_quals = TYPE_UNQUALIFIED;
+ size_varies = 0;
- type = build_function_type (type, arg_types);
- declarator = TREE_OPERAND (declarator, 0);
+ /* When the pointed-to type involves components of variable size,
+ care must be taken to ensure that the size evaluation code is
+ emitted early enough to dominate all the possible later uses
+ and late enough for the variables on which it depends to have
+ been assigned.
+
+ This is expected to happen automatically when the pointed-to
+ type has a name/declaration of it's own, but special attention
+ is required if the type is anonymous.
+
+ We handle the NORMAL and FIELD contexts here by attaching an
+ artificial TYPE_DECL to such pointed-to type. This forces the
+ sizes evaluation at a safe point and ensures it is not deferred
+ until e.g. within a deeper conditional context.
+
+ We expect nothing to be needed here for PARM or TYPENAME.
+ Pushing a TYPE_DECL at this point for TYPENAME would actually
+ be incorrect, as we might be in the middle of an expression
+ with side effects on the pointed-to type size "arguments" prior
+ to the pointer declaration point and the fake TYPE_DECL in the
+ enclosing context would force the size evaluation prior to the
+ side effects. */
+
+ if (!TYPE_NAME (type)
+ && (decl_context == NORMAL || decl_context == FIELD)
+ && variably_modified_type_p (type, NULL_TREE))
+ {
+ tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
+ DECL_ARTIFICIAL (decl) = 1;
+ pushdecl (decl);
+ finish_decl (decl, NULL_TREE, NULL_TREE);
+ TYPE_NAME (type) = decl;
+ }
- /* Set the TYPE_CONTEXTs for each tagged type which is local to
- the formal parameter list of this FUNCTION_TYPE to point to
- the FUNCTION_TYPE node itself. */
+ type = build_pointer_type (type);
- {
- tree link;
+ /* Process type qualifiers (such as const or volatile)
+ that were given inside the `*'. */
+ type_quals = declarator->u.pointer_quals;
- for (link = last_function_parm_tags;
- link;
- link = TREE_CHAIN (link))
- TYPE_CONTEXT (TREE_VALUE (link)) = type;
+ declarator = declarator->declarator;
+ break;
}
+ default:
+ gcc_unreachable ();
}
- else if (TREE_CODE (declarator) == INDIRECT_REF)
- {
- /* Merge any constancy or volatility into the target type
- for the pointer. */
-
- if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
- && type_quals)
- pedwarn ("ISO C forbids qualified function types");
- if (type_quals)
- type = c_build_qualified_type (type, type_quals);
- type_quals = TYPE_UNQUALIFIED;
- size_varies = 0;
-
- type = build_pointer_type (type);
-
- /* Process a list of type modifier keywords
- (such as const or volatile) that were given inside the `*'. */
-
- if (TREE_TYPE (declarator))
- {
- tree typemodlist;
- int erred = 0;
-
- constp = 0;
- volatilep = 0;
- restrictp = 0;
- for (typemodlist = TREE_TYPE (declarator); typemodlist;
- typemodlist = TREE_CHAIN (typemodlist))
- {
- tree qualifier = TREE_VALUE (typemodlist);
-
- if (C_IS_RESERVED_WORD (qualifier))
- {
- if (C_RID_CODE (qualifier) == RID_CONST)
- constp++;
- else if (C_RID_CODE (qualifier) == RID_VOLATILE)
- volatilep++;
- else if (C_RID_CODE (qualifier) == RID_RESTRICT)
- restrictp++;
- else
- erred++;
- }
- else
- erred++;
- }
-
- if (erred)
- error ("invalid type modifier within pointer declarator");
- if (constp > 1 && ! flag_isoc99)
- pedwarn ("duplicate `const'");
- if (volatilep > 1 && ! flag_isoc99)
- pedwarn ("duplicate `volatile'");
- if (restrictp > 1 && ! flag_isoc99)
- pedwarn ("duplicate `restrict'");
-
- type_quals = ((constp ? TYPE_QUAL_CONST : 0)
- | (restrictp ? TYPE_QUAL_RESTRICT : 0)
- | (volatilep ? TYPE_QUAL_VOLATILE : 0));
- }
-
- declarator = TREE_OPERAND (declarator, 0);
- }
- else
- abort ();
-
}
+ *decl_attrs = chainon (returned_attrs, *decl_attrs);
- /* Now TYPE has the actual type. */
+ /* Now TYPE has the actual type, apart from any qualifiers in
+ TYPE_QUALS. */
+
+ /* Check the type and width of a bit-field. */
+ if (bitfield)
+ check_bitfield_type_and_width (&type, width, orig_name);
/* Did array size calculations overflow? */
if (TREE_CODE (type) == ARRAY_TYPE
&& COMPLETE_TYPE_P (type)
- && TREE_OVERFLOW (TYPE_SIZE (type)))
+ && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
+ && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
{
- error ("size of array `%s' is too large", name);
+ error ("size of array %qs is too large", name);
/* If we proceed with the array type as it is, we'll eventually
crash in tree_low_cst(). */
type = error_mark_node;
/* If this is declaring a typedef name, return a TYPE_DECL. */
- if (specbits & (1 << (int) RID_TYPEDEF))
+ if (storage_class == csc_typedef)
{
tree decl;
- /* Note that the grammar rejects storage classes
- in typenames, fields or parameters */
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
&& type_quals)
- pedwarn ("ISO C forbids qualified function types");
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C forbids qualified function types");
if (type_quals)
type = c_build_qualified_type (type, type_quals);
- decl = build_decl (TYPE_DECL, declarator, type);
- if ((specbits & (1 << (int) RID_SIGNED))
- || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
+ decl = build_decl (TYPE_DECL, declarator->u.id, type);
+ DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
+ if (declspecs->explicit_signed_p)
C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
- decl_attributes (&decl, returned_attrs, 0);
+ if (declspecs->inline_p)
+ pedwarn (input_location, 0,"typedef %q+D declared %<inline%>", decl);
return decl;
}
- /* Detect the case of an array type of unspecified size
- which came, as such, direct from a typedef name.
- We must copy the type, so that each identifier gets
- a distinct type, so that each identifier's size can be
- controlled separately by its own initializer. */
-
- if (type != 0 && typedef_type != 0
- && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
- && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
- {
- type = build_array_type (TREE_TYPE (type), 0);
- if (size_varies)
- C_TYPE_VARIABLE_SIZE (type) = 1;
- }
-
/* If this is a type name (such as, in a cast or sizeof),
compute the type and return it now. */
if (decl_context == TYPENAME)
{
- /* Note that the grammar rejects storage classes
- in typenames, fields or parameters */
+ /* Note that the grammar rejects storage classes in typenames
+ and fields. */
+ gcc_assert (storage_class == csc_none && !threadp
+ && !declspecs->inline_p);
if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
&& type_quals)
- pedwarn ("ISO C forbids const or volatile function types");
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C forbids const or volatile function types");
if (type_quals)
type = c_build_qualified_type (type, type_quals);
- decl_attributes (&type, returned_attrs, 0);
return type;
}
+ if (pedantic && decl_context == FIELD
+ && variably_modified_type_p (type, NULL_TREE))
+ {
+ /* C99 6.7.2.1p8 */
+ pedwarn (input_location, OPT_pedantic,
+ "a member of a structure or union cannot have a variably modified type");
+ }
+
/* Aside from typedefs and type names (handle above),
`void' at top level (not within pointer)
is allowed only in public variables.
a better error message can be made later. */
if (VOID_TYPE_P (type) && decl_context != PARM
- && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
- && ((specbits & (1 << (int) RID_EXTERN))
- || (current_binding_level == global_binding_level
- && !(specbits
- & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
+ && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
+ && (storage_class == csc_extern
+ || (current_scope == file_scope
+ && !(storage_class == csc_static
+ || storage_class == csc_register)))))
{
- error ("variable or field `%s' declared void", name);
+ error ("variable or field %qs declared void", name);
type = integer_type_node;
}
if (decl_context == PARM)
{
- tree type_as_written;
tree promoted_type;
/* A parameter declared as an array of T is really a pointer to T.
if (type_quals)
type = c_build_qualified_type (type, type_quals);
type = build_pointer_type (type);
- type_quals = TYPE_UNQUALIFIED;
- if (array_ptr_quals)
- {
- tree new_ptr_quals, new_ptr_attrs;
- int erred = 0;
- split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
- /* We don't yet implement attributes in this context. */
- if (new_ptr_attrs != NULL_TREE)
- warning ("attributes in parameter array declarator ignored");
-
- constp = 0;
- volatilep = 0;
- restrictp = 0;
- for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
- {
- tree qualifier = TREE_VALUE (new_ptr_quals);
-
- if (C_IS_RESERVED_WORD (qualifier))
- {
- if (C_RID_CODE (qualifier) == RID_CONST)
- constp++;
- else if (C_RID_CODE (qualifier) == RID_VOLATILE)
- volatilep++;
- else if (C_RID_CODE (qualifier) == RID_RESTRICT)
- restrictp++;
- else
- erred++;
- }
- else
- erred++;
- }
+ type_quals = array_ptr_quals;
+ if (type_quals)
+ type = c_build_qualified_type (type, type_quals);
- if (erred)
- error ("invalid type modifier within array declarator");
+ /* We don't yet implement attributes in this context. */
+ if (array_ptr_attrs != NULL_TREE)
+ warning (OPT_Wattributes,
+ "attributes in parameter array declarator ignored");
- type_quals = ((constp ? TYPE_QUAL_CONST : 0)
- | (restrictp ? TYPE_QUAL_RESTRICT : 0)
- | (volatilep ? TYPE_QUAL_VOLATILE : 0));
- }
size_varies = 0;
}
else if (TREE_CODE (type) == FUNCTION_TYPE)
{
- if (pedantic && type_quals)
- pedwarn ("ISO C forbids qualified function types");
+ if (type_quals)
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C forbids qualified function types");
if (type_quals)
type = c_build_qualified_type (type, type_quals);
type = build_pointer_type (type);
}
else if (type_quals)
type = c_build_qualified_type (type, type_quals);
-
- type_as_written = type;
- decl = build_decl (PARM_DECL, declarator, type);
+ decl = build_decl (PARM_DECL, declarator->u.id, type);
+ DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
if (size_varies)
C_DECL_VARIABLE_SIZE (decl) = 1;
if (type == error_mark_node)
promoted_type = type;
else
- {
- promoted_type = simple_type_promotes_to (type);
- if (! promoted_type)
- promoted_type = type;
- }
+ promoted_type = c_type_promotes_to (type);
DECL_ARG_TYPE (decl) = promoted_type;
- DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
+ if (declspecs->inline_p)
+ pedwarn (input_location, 0, "parameter %q+D declared %<inline%>", decl);
}
else if (decl_context == FIELD)
{
+ /* Note that the grammar rejects storage classes in typenames
+ and fields. */
+ gcc_assert (storage_class == csc_none && !threadp
+ && !declspecs->inline_p);
+
/* Structure field. It may not be a function. */
if (TREE_CODE (type) == FUNCTION_TYPE)
{
- error ("field `%s' declared as a function", name);
+ error ("field %qs declared as a function", name);
type = build_pointer_type (type);
}
else if (TREE_CODE (type) != ERROR_MARK
- && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
+ && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
{
- error ("field `%s' has incomplete type", name);
+ error ("field %qs has incomplete type", name);
type = error_mark_node;
}
- /* Move type qualifiers down to element of an array. */
- if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
- {
- type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
- type_quals),
- TYPE_DOMAIN (type));
-#if 0
- /* Leave the field const or volatile as well. */
- type_quals = TYPE_UNQUALIFIED;
-#endif
- }
- decl = build_decl (FIELD_DECL, declarator, type);
+ type = c_build_qualified_type (type, type_quals);
+ decl = build_decl (FIELD_DECL, declarator->u.id, type);
+ DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
DECL_NONADDRESSABLE_P (decl) = bitfield;
+ if (bitfield && !declarator->u.id)
+ TREE_NO_WARNING (decl) = 1;
if (size_varies)
C_DECL_VARIABLE_SIZE (decl) = 1;
}
else if (TREE_CODE (type) == FUNCTION_TYPE)
{
- /* Every function declaration is "external"
- except for those which are inside a function body
- in which `auto' is used.
- That is a case not specified by ANSI C,
- and we use it for forward declarations for nested functions. */
- int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
- || current_binding_level == global_binding_level);
-
- if (specbits & (1 << (int) RID_AUTO)
- && (pedantic || current_binding_level == global_binding_level))
- pedwarn ("invalid storage class for function `%s'", name);
- if (specbits & (1 << (int) RID_REGISTER))
- error ("invalid storage class for function `%s'", name);
- /* Function declaration not at top level.
- Storage classes other than `extern' are not allowed
- and `extern' makes no difference. */
- if (current_binding_level != global_binding_level
- && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
- && pedantic)
- pedwarn ("invalid storage class for function `%s'", name);
-
- decl = build_decl (FUNCTION_DECL, declarator, type);
- decl = build_decl_attribute_variant (decl, decl_attr);
+ if (storage_class == csc_register || threadp)
+ {
+ error ("invalid storage class for function %qs", name);
+ }
+ else if (current_scope != file_scope)
+ {
+ /* Function declaration not at file scope. Storage
+ classes other than `extern' are not allowed, C99
+ 6.7.1p5, and `extern' makes no difference. However,
+ GCC allows 'auto', perhaps with 'inline', to support
+ nested functions. */
+ if (storage_class == csc_auto)
+ pedwarn (input_location, OPT_pedantic, "invalid storage class for function %qs", name);
+ else if (storage_class == csc_static)
+ {
+ error ("invalid storage class for function %qs", name);
+ if (funcdef_flag)
+ storage_class = declspecs->storage_class = csc_none;
+ else
+ return 0;
+ }
+ }
- DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
- ggc_alloc_cleared (sizeof (struct lang_decl));
+ decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
+ DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
+ decl = build_decl_attribute_variant (decl, decl_attr);
- if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
- pedwarn ("ISO C forbids qualified function types");
+ if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C forbids qualified function types");
- /* GNU C interprets a `volatile void' return type to indicate
+ /* GNU C interprets a volatile-qualified function type to indicate
that the function does not return. */
if ((type_quals & TYPE_QUAL_VOLATILE)
&& !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
- warning ("`noreturn' function returns non-void value");
+ warning (0, "%<noreturn%> function returns non-void value");
+
+ /* Every function declaration is an external reference
+ (DECL_EXTERNAL) except for those which are not at file
+ scope and are explicitly declared "auto". This is
+ forbidden by standard C (C99 6.7.1p5) and is interpreted by
+ GCC to signify a forward declaration of a nested function. */
+ if (storage_class == csc_auto && current_scope != file_scope)
+ DECL_EXTERNAL (decl) = 0;
+ /* In C99, a function which is declared 'inline' with 'extern'
+ is not an external reference (which is confusing). It
+ means that the later definition of the function must be output
+ in this file, C99 6.7.4p6. In GNU C89, a function declared
+ 'extern inline' is an external reference. */
+ else if (declspecs->inline_p && storage_class != csc_static)
+ DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
+ == flag_gnu89_inline);
+ else
+ DECL_EXTERNAL (decl) = !initialized;
- if (extern_ref)
- DECL_EXTERNAL (decl) = 1;
/* Record absence of global scope for `static' or `auto'. */
TREE_PUBLIC (decl)
- = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
+ = !(storage_class == csc_static || storage_class == csc_auto);
- if (defaulted_int)
+ /* For a function definition, record the argument information
+ block where store_parm_decls will look for it. */
+ if (funcdef_flag)
+ current_function_arg_info = arg_info;
+
+ if (declspecs->default_int_p)
C_FUNCTION_IMPLICIT_INT (decl) = 1;
/* Record presence of `inline', if it is reasonable. */
- if (MAIN_NAME_P (declarator))
- {
- if (inlinep)
- warning ("cannot inline function `main'");
- }
- else if (inlinep)
- {
- /* Assume that otherwise the function can be inlined. */
- DECL_DECLARED_INLINE_P (decl) = 1;
-
- /* Do not mark bare declarations as DECL_INLINE. Doing so
- in the presence of multiple declarations can result in
- the abstract origin pointing between the declarations,
- which will confuse dwarf2out. */
- if (initialized)
- {
- DECL_INLINE (decl) = 1;
- if (specbits & (1 << (int) RID_EXTERN))
- current_extern_inline = 1;
- }
- }
- /* If -finline-functions, assume it can be inlined. This does
- two things: let the function be deferred until it is actually
- needed, and let dwarf2 know that the function is inlinable. */
- else if (flag_inline_trees == 2 && initialized)
+ if (flag_hosted && MAIN_NAME_P (declarator->u.id))
{
- DECL_INLINE (decl) = 1;
- DECL_DECLARED_INLINE_P (decl) = 0;
+ if (declspecs->inline_p)
+ pedwarn (input_location, 0, "cannot inline function %<main%>");
}
+ else if (declspecs->inline_p)
+ /* Record that the function is declared `inline'. */
+ DECL_DECLARED_INLINE_P (decl) = 1;
}
else
{
/* It's a variable. */
/* An uninitialized decl with `extern' is a reference. */
- int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
+ int extern_ref = !initialized && storage_class == csc_extern;
+
+ type = c_build_qualified_type (type, type_quals);
- /* Move type qualifiers down to element of an array. */
- if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
+ /* C99 6.2.2p7: It is invalid (compile-time undefined
+ behavior) to create an 'extern' declaration for a
+ variable if there is a global declaration that is
+ 'static' and the global declaration is not visible.
+ (If the static declaration _is_ currently visible,
+ the 'extern' declaration is taken to refer to that decl.) */
+ if (extern_ref && current_scope != file_scope)
{
- int saved_align = TYPE_ALIGN(type);
- type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
- type_quals),
- TYPE_DOMAIN (type));
- TYPE_ALIGN (type) = saved_align;
-#if 0 /* Leave the variable const or volatile as well. */
- type_quals = TYPE_UNQUALIFIED;
-#endif
+ tree global_decl = identifier_global_value (declarator->u.id);
+ tree visible_decl = lookup_name (declarator->u.id);
+
+ if (global_decl
+ && global_decl != visible_decl
+ && TREE_CODE (global_decl) == VAR_DECL
+ && !TREE_PUBLIC (global_decl))
+ error ("variable previously declared %<static%> redeclared "
+ "%<extern%>");
}
- else if (type_quals)
- type = c_build_qualified_type (type, type_quals);
-
- decl = build_decl (VAR_DECL, declarator, type);
+
+ decl = build_decl (VAR_DECL, declarator->u.id, type);
+ DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
if (size_varies)
C_DECL_VARIABLE_SIZE (decl) = 1;
- if (inlinep)
- pedwarn_with_decl (decl, "variable `%s' declared `inline'");
+ if (declspecs->inline_p)
+ pedwarn (input_location, 0, "variable %q+D declared %<inline%>", decl);
+
+ /* At file scope, an initialized extern declaration may follow
+ a static declaration. In that case, DECL_EXTERNAL will be
+ reset later in start_decl. */
+ DECL_EXTERNAL (decl) = (storage_class == csc_extern);
- DECL_EXTERNAL (decl) = extern_ref;
- /* At top level, the presence of a `static' or `register' storage
+ /* At file scope, the presence of a `static' or `register' storage
class specifier, or the absence of all storage class specifiers
makes this declaration a definition (perhaps tentative). Also,
- the absence of both `static' and `register' makes it public. */
- if (current_binding_level == global_binding_level)
+ the absence of `static' makes it public. */
+ if (current_scope == file_scope)
{
- TREE_PUBLIC (decl)
- = !(specbits
- & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
- TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
+ TREE_PUBLIC (decl) = storage_class != csc_static;
+ TREE_STATIC (decl) = !extern_ref;
}
- /* Not at top level, only `static' makes a static definition. */
+ /* Not at file scope, only `static' makes a static definition. */
else
{
- TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
- TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
+ TREE_STATIC (decl) = (storage_class == csc_static);
+ TREE_PUBLIC (decl) = extern_ref;
}
+
+ if (threadp)
+ DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
+ }
+
+ if (storage_class == csc_extern
+ && variably_modified_type_p (type, NULL_TREE))
+ {
+ /* C99 6.7.5.2p2 */
+ error ("object with variably modified type must have no linkage");
}
/* Record `register' declaration for warnings on &
and in case doing stupid register allocation. */
- if (specbits & (1 << (int) RID_REGISTER))
- DECL_REGISTER (decl) = 1;
+ if (storage_class == csc_register)
+ {
+ C_DECL_REGISTER (decl) = 1;
+ DECL_REGISTER (decl) = 1;
+ }
/* Record constancy and volatility. */
c_apply_type_quals_to_decl (type_quals, decl);
/* If a type has volatile components, it should be stored in memory.
Otherwise, the fact that those components are volatile
- will be ignored, and would even crash the compiler. */
- if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
- mark_addressable (decl);
+ will be ignored, and would even crash the compiler.
+ Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
+ if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
+ && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
+ || TREE_CODE (decl) == RESULT_DECL))
+ {
+ /* It is not an error for a structure with volatile fields to
+ be declared register, but reset DECL_REGISTER since it
+ cannot actually go in a register. */
+ int was_reg = C_DECL_REGISTER (decl);
+ C_DECL_REGISTER (decl) = 0;
+ DECL_REGISTER (decl) = 0;
+ c_mark_addressable (decl);
+ C_DECL_REGISTER (decl) = was_reg;
+ }
- decl_attributes (&decl, returned_attrs, 0);
+ /* This is the earliest point at which we might know the assembler
+ name of a variable. Thus, if it's known before this, die horribly. */
+ gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
return decl;
}
}
\f
/* Decode the parameter-list info for a function type or function definition.
- The argument is the value returned by `get_parm_info' (or made in parse.y
+ The argument is the value returned by `get_parm_info' (or made in c-parse.c
if there is an identifier list instead of a parameter decl list).
These two functions are separate because when a function returns
or receives functions then each is called multiple times but the order
of calls is different. The last call to `grokparms' is always the one
that contains the formal parameter names of a function definition.
- Store in `last_function_parms' a chain of the decls of parms.
- Also store in `last_function_parm_tags' a chain of the struct, union,
- and enum tags declared among the parms.
-
Return a list of arg types to use in the FUNCTION_TYPE for this function.
- FUNCDEF_FLAG is nonzero for a function definition, 0 for
+ FUNCDEF_FLAG is true for a function definition, false for
a mere declaration. A nonempty identifier-list gets an error message
- when FUNCDEF_FLAG is zero. */
+ when FUNCDEF_FLAG is false. */
static tree
-grokparms (parms_info, funcdef_flag)
- tree parms_info;
- int funcdef_flag;
+grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
{
- tree first_parm = TREE_CHAIN (parms_info);
+ tree arg_types = arg_info->types;
+
+ if (funcdef_flag && arg_info->had_vla_unspec)
+ {
+ /* A function definition isn't function prototype scope C99 6.2.1p4. */
+ /* C99 6.7.5.2p4 */
+ error ("%<[*]%> not allowed in other than function prototype scope");
+ }
- last_function_parms = TREE_PURPOSE (parms_info);
- last_function_parm_tags = TREE_VALUE (parms_info);
+ if (arg_types == 0 && !funcdef_flag && !in_system_header)
+ warning (OPT_Wstrict_prototypes,
+ "function declaration isn%'t a prototype");
- if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
- && !in_system_header)
- warning ("function declaration isn't a prototype");
+ if (arg_types == error_mark_node)
+ return 0; /* don't set TYPE_ARG_TYPES in this case */
- if (first_parm != 0
- && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
+ else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
{
- if (! funcdef_flag)
- pedwarn ("parameter names (without types) in function declaration");
+ if (!funcdef_flag)
+ pedwarn (input_location, 0, "parameter names (without types) in function declaration");
- last_function_parms = first_parm;
+ arg_info->parms = arg_info->types;
+ arg_info->types = 0;
return 0;
}
else
{
- tree parm;
- tree typelt;
- /* We no longer test FUNCDEF_FLAG.
- If the arg types are incomplete in a declaration,
- they must include undefined tags.
- These tags can never be defined in the scope of the declaration,
- so the types can never be completed,
- and no call can be compiled successfully. */
-#if 0
- /* In a fcn definition, arg types must be complete. */
- if (funcdef_flag)
-#endif
- for (parm = last_function_parms, typelt = first_parm;
- parm;
- parm = TREE_CHAIN (parm))
- /* Skip over any enumeration constants declared here. */
- if (TREE_CODE (parm) == PARM_DECL)
+ tree parm, type, typelt;
+ unsigned int parmno;
+
+ /* If there is a parameter of incomplete type in a definition,
+ this is an error. In a declaration this is valid, and a
+ struct or union type may be completed later, before any calls
+ or definition of the function. In the case where the tag was
+ first declared within the parameter list, a warning has
+ already been given. If a parameter has void type, then
+ however the function cannot be defined or called, so
+ warn. */
+
+ for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
+ parm;
+ parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
+ {
+ type = TREE_VALUE (typelt);
+ if (type == error_mark_node)
+ continue;
+
+ if (!COMPLETE_TYPE_P (type))
{
- /* Barf if the parameter itself has an incomplete type. */
- tree type = TREE_VALUE (typelt);
- if (type == error_mark_node)
- continue;
- if (!COMPLETE_TYPE_P (type))
+ if (funcdef_flag)
{
- if (funcdef_flag && DECL_NAME (parm) != 0)
- error ("parameter `%s' has incomplete type",
- IDENTIFIER_POINTER (DECL_NAME (parm)));
+ if (DECL_NAME (parm))
+ error ("parameter %u (%q+D) has incomplete type",
+ parmno, parm);
else
- warning ("parameter has incomplete type");
- if (funcdef_flag)
- {
- TREE_VALUE (typelt) = error_mark_node;
- TREE_TYPE (parm) = error_mark_node;
- }
+ error ("%Jparameter %u has incomplete type",
+ parm, parmno);
+
+ TREE_VALUE (typelt) = error_mark_node;
+ TREE_TYPE (parm) = error_mark_node;
}
-#if 0
- /* This has been replaced by parm_tags_warning, which
- uses a more accurate criterion for what to warn
- about. */
- else
+ else if (VOID_TYPE_P (type))
{
- /* Now warn if is a pointer to an incomplete type. */
- while (TREE_CODE (type) == POINTER_TYPE
- || TREE_CODE (type) == REFERENCE_TYPE)
- type = TREE_TYPE (type);
- type = TYPE_MAIN_VARIANT (type);
- if (!COMPLETE_TYPE_P (type))
- {
- if (DECL_NAME (parm) != 0)
- warning ("parameter `%s' points to incomplete type",
- IDENTIFIER_POINTER (DECL_NAME (parm)));
- else
- warning ("parameter points to incomplete type");
- }
+ if (DECL_NAME (parm))
+ warning (0, "parameter %u (%q+D) has void type",
+ parmno, parm);
+ else
+ warning (0, "%Jparameter %u has void type",
+ parm, parmno);
}
-#endif
- typelt = TREE_CHAIN (typelt);
}
- return first_parm;
+ if (DECL_NAME (parm) && TREE_USED (parm))
+ warn_if_shadowing (parm);
+ }
+ return arg_types;
}
}
-/* Return a tree_list node with info on a parameter list just parsed.
- The TREE_PURPOSE is a chain of decls of those parms.
- The TREE_VALUE is a list of structure, union and enum tags defined.
- The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
- This tree_list node is later fed to `grokparms'.
+/* Take apart the current scope and return a c_arg_info structure with
+ info on a parameter list just parsed.
- VOID_AT_END nonzero means append `void' to the end of the type-list.
- Zero means the parmlist ended with an ellipsis so don't append `void'. */
+ This structure is later fed to 'grokparms' and 'store_parm_decls'.
-tree
-get_parm_info (void_at_end)
- int void_at_end;
-{
- tree decl, t;
- tree types = 0;
- int erred = 0;
- tree tags = gettags ();
- tree parms = getdecls ();
- tree new_parms = 0;
- tree order = current_binding_level->parm_order;
-
- /* Just `void' (and no ellipsis) is special. There are really no parms.
- But if the `void' is qualified (by `const' or `volatile') or has a
- storage class specifier (`register'), then the behavior is undefined;
- by not counting it as the special case of `void' we will cause an
- error later. Typedefs for `void' are OK (see DR#157). */
- if (void_at_end && parms != 0
- && TREE_CHAIN (parms) == 0
- && VOID_TYPE_P (TREE_TYPE (parms))
- && ! TREE_THIS_VOLATILE (parms)
- && ! TREE_READONLY (parms)
- && ! DECL_REGISTER (parms)
- && DECL_NAME (parms) == 0)
- {
- parms = NULL_TREE;
- storedecls (NULL_TREE);
- return tree_cons (NULL_TREE, NULL_TREE,
- tree_cons (NULL_TREE, void_type_node, NULL_TREE));
- }
-
- /* Extract enumerator values and other non-parms declared with the parms.
- Likewise any forward parm decls that didn't have real parm decls. */
- for (decl = parms; decl;)
- {
- tree next = TREE_CHAIN (decl);
-
- if (TREE_CODE (decl) != PARM_DECL)
- {
- TREE_CHAIN (decl) = new_parms;
- new_parms = decl;
- }
- else if (TREE_ASM_WRITTEN (decl))
- {
- error_with_decl (decl,
- "parameter `%s' has just a forward declaration");
- TREE_CHAIN (decl) = new_parms;
- new_parms = decl;
- }
- decl = next;
- }
+ ELLIPSIS being true means the argument list ended in '...' so don't
+ append a sentinel (void_list_node) to the end of the type-list. */
- /* Put the parm decls back in the order they were in in the parm list. */
- for (t = order; t; t = TREE_CHAIN (t))
- {
- if (TREE_CHAIN (t))
- TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
- else
- TREE_CHAIN (TREE_VALUE (t)) = 0;
- }
+struct c_arg_info *
+get_parm_info (bool ellipsis)
+{
+ struct c_binding *b = current_scope->bindings;
+ struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
+ struct c_arg_info);
+ tree parms = 0;
+ tree tags = 0;
+ tree types = 0;
+ tree others = 0;
+
+ static bool explained_incomplete_types = false;
+ bool gave_void_only_once_err = false;
+
+ arg_info->parms = 0;
+ arg_info->tags = 0;
+ arg_info->types = 0;
+ arg_info->others = 0;
+ arg_info->pending_sizes = 0;
+ arg_info->had_vla_unspec = current_scope->had_vla_unspec;
+
+ /* The bindings in this scope must not get put into a block.
+ We will take care of deleting the binding nodes. */
+ current_scope->bindings = 0;
+
+ /* This function is only called if there was *something* on the
+ parameter list. */
+ gcc_assert (b);
+
+ /* A parameter list consisting solely of 'void' indicates that the
+ function takes no arguments. But if the 'void' is qualified
+ (by 'const' or 'volatile'), or has a storage class specifier
+ ('register'), then the behavior is undefined; issue an error.
+ Typedefs for 'void' are OK (see DR#157). */
+ if (b->prev == 0 /* one binding */
+ && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
+ && !DECL_NAME (b->decl) /* anonymous */
+ && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
+ {
+ if (TREE_THIS_VOLATILE (b->decl)
+ || TREE_READONLY (b->decl)
+ || C_DECL_REGISTER (b->decl))
+ error ("%<void%> as only parameter may not be qualified");
+
+ /* There cannot be an ellipsis. */
+ if (ellipsis)
+ error ("%<void%> must be the only parameter");
+
+ arg_info->types = void_list_node;
+ return arg_info;
+ }
+
+ if (!ellipsis)
+ types = void_list_node;
+
+ /* Break up the bindings list into parms, tags, types, and others;
+ apply sanity checks; purge the name-to-decl bindings. */
+ while (b)
+ {
+ tree decl = b->decl;
+ tree type = TREE_TYPE (decl);
+ const char *keyword;
- new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
- new_parms);
+ switch (TREE_CODE (decl))
+ {
+ case PARM_DECL:
+ if (b->id)
+ {
+ gcc_assert (I_SYMBOL_BINDING (b->id) == b);
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ }
- /* Store the parmlist in the binding level since the old one
- is no longer a valid list. (We have changed the chain pointers.) */
- storedecls (new_parms);
+ /* Check for forward decls that never got their actual decl. */
+ if (TREE_ASM_WRITTEN (decl))
+ error ("parameter %q+D has just a forward declaration", decl);
+ /* Check for (..., void, ...) and issue an error. */
+ else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
+ {
+ if (!gave_void_only_once_err)
+ {
+ error ("%<void%> must be the only parameter");
+ gave_void_only_once_err = true;
+ }
+ }
+ else
+ {
+ /* Valid parameter, add it to the list. */
+ TREE_CHAIN (decl) = parms;
+ parms = decl;
+
+ /* Since there is a prototype, args are passed in their
+ declared types. The back end may override this later. */
+ DECL_ARG_TYPE (decl) = type;
+ types = tree_cons (0, type, types);
+ }
+ break;
- for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
- /* There may also be declarations for enumerators if an enumeration
- type is declared among the parms. Ignore them here. */
- if (TREE_CODE (decl) == PARM_DECL)
- {
- /* Since there is a prototype,
- args are passed in their declared types. */
- tree type = TREE_TYPE (decl);
- DECL_ARG_TYPE (decl) = type;
- if (PROMOTE_PROTOTYPES
- && INTEGRAL_TYPE_P (type)
- && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
- DECL_ARG_TYPE (decl) = integer_type_node;
-
- types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
- if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
- && DECL_NAME (decl) == 0)
- {
- error ("`void' in parameter list must be the entire list");
- erred = 1;
- }
- }
+ case ENUMERAL_TYPE: keyword = "enum"; goto tag;
+ case UNION_TYPE: keyword = "union"; goto tag;
+ case RECORD_TYPE: keyword = "struct"; goto tag;
+ tag:
+ /* Types may not have tag-names, in which case the type
+ appears in the bindings list with b->id NULL. */
+ if (b->id)
+ {
+ gcc_assert (I_TAG_BINDING (b->id) == b);
+ I_TAG_BINDING (b->id) = b->shadowed;
+ }
- if (void_at_end)
- return tree_cons (new_parms, tags,
- nreverse (tree_cons (NULL_TREE, void_type_node, types)));
+ /* Warn about any struct, union or enum tags defined in a
+ parameter list. The scope of such types is limited to
+ the parameter list, which is rarely if ever desirable
+ (it's impossible to call such a function with type-
+ correct arguments). An anonymous union parm type is
+ meaningful as a GNU extension, so don't warn for that. */
+ if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
+ {
+ if (b->id)
+ /* The %s will be one of 'struct', 'union', or 'enum'. */
+ warning (0, "%<%s %E%> declared inside parameter list",
+ keyword, b->id);
+ else
+ /* The %s will be one of 'struct', 'union', or 'enum'. */
+ warning (0, "anonymous %s declared inside parameter list",
+ keyword);
- return tree_cons (new_parms, tags, nreverse (types));
-}
+ if (!explained_incomplete_types)
+ {
+ warning (0, "its scope is only this definition or declaration,"
+ " which is probably not what you want");
+ explained_incomplete_types = true;
+ }
+ }
-/* At end of parameter list, warn about any struct, union or enum tags
- defined within. Do so because these types cannot ever become complete. */
+ tags = tree_cons (b->id, decl, tags);
+ break;
-void
-parmlist_tags_warning ()
-{
- tree elt;
- static int already;
+ case CONST_DECL:
+ case TYPE_DECL:
+ case FUNCTION_DECL:
+ /* CONST_DECLs appear here when we have an embedded enum,
+ and TYPE_DECLs appear here when we have an embedded struct
+ or union. No warnings for this - we already warned about the
+ type itself. FUNCTION_DECLs appear when there is an implicit
+ function declaration in the parameter list. */
+
+ TREE_CHAIN (decl) = others;
+ others = decl;
+ /* fall through */
+
+ case ERROR_MARK:
+ /* error_mark_node appears here when we have an undeclared
+ variable. Just throw it away. */
+ if (b->id)
+ {
+ gcc_assert (I_SYMBOL_BINDING (b->id) == b);
+ I_SYMBOL_BINDING (b->id) = b->shadowed;
+ }
+ break;
- for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
- {
- enum tree_code code = TREE_CODE (TREE_VALUE (elt));
- /* An anonymous union parm type is meaningful as a GNU extension.
- So don't warn for that. */
- if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
- continue;
- if (TREE_PURPOSE (elt) != 0)
- {
- if (code == RECORD_TYPE)
- warning ("`struct %s' declared inside parameter list",
- IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
- else if (code == UNION_TYPE)
- warning ("`union %s' declared inside parameter list",
- IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
- else
- warning ("`enum %s' declared inside parameter list",
- IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
- }
- else
- {
- /* For translation these need to be separate warnings */
- if (code == RECORD_TYPE)
- warning ("anonymous struct declared inside parameter list");
- else if (code == UNION_TYPE)
- warning ("anonymous union declared inside parameter list");
- else
- warning ("anonymous enum declared inside parameter list");
- }
- if (! already)
- {
- warning ("its scope is only this definition or declaration, which is probably not what you want");
- already = 1;
+ /* Other things that might be encountered. */
+ case LABEL_DECL:
+ case VAR_DECL:
+ default:
+ gcc_unreachable ();
}
+
+ b = free_binding_and_advance (b);
}
+
+ arg_info->parms = parms;
+ arg_info->tags = tags;
+ arg_info->types = types;
+ arg_info->others = others;
+ arg_info->pending_sizes = get_pending_sizes ();
+ return arg_info;
}
\f
/* Get the struct, enum or union (CODE says which) with tag NAME.
- Define the tag as a forward-reference if it is not defined. */
+ Define the tag as a forward-reference if it is not defined.
+ Return a c_typespec structure for the type specifier. */
-tree
-xref_tag (code, name)
- enum tree_code code;
- tree name;
+struct c_typespec
+parser_xref_tag (enum tree_code code, tree name)
{
+ struct c_typespec ret;
/* If a cross reference is requested, look up the type
already defined for this tag and return it. */
- tree ref = lookup_tag (code, name, current_binding_level, 0);
+ tree ref = lookup_tag (code, name, 0);
/* If this is the right type of tag, return what we found.
(This reference will be shadowed by shadow_tag later if appropriate.)
If this is the wrong type of tag, do not return it. If it was the
- wrong type in the same binding level, we will have had an error
- message already; if in a different binding level and declaring
+ wrong type in the same scope, we will have had an error
+ message already; if in a different scope and declaring
a name, pending_xref_error will give an error message; but if in a
- different binding level and not declaring a name, this tag should
+ different scope and not declaring a name, this tag should
shadow the previous declaration of a different type of tag, and
this would not work properly if we return the reference found.
(For example, with "struct foo" in an outer scope, "union foo;"
must shadow that tag with a new one of union type.) */
+ ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
if (ref && TREE_CODE (ref) == code)
- return ref;
+ {
+ ret.spec = ref;
+ return ret;
+ }
/* If no such tag is yet defined, create a forward-reference node
and record it as the "definition".
{
/* Give the type a default layout like unsigned int
to avoid crashing if it does not get defined. */
- TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
+ SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
TYPE_USER_ALIGN (ref) = 0;
- TREE_UNSIGNED (ref) = 1;
+ TYPE_UNSIGNED (ref) = 1;
TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
pushtag (name, ref);
- return ref;
+ ret.spec = ref;
+ return ret;
+}
+
+/* Get the struct, enum or union (CODE says which) with tag NAME.
+ Define the tag as a forward-reference if it is not defined.
+ Return a tree for the type. */
+
+tree
+xref_tag (enum tree_code code, tree name)
+{
+ return parser_xref_tag (code, name).spec;
}
\f
-/* Make sure that the tag NAME is defined *in the current binding level*
+/* Make sure that the tag NAME is defined *in the current scope*
at least as a forward reference.
CODE says which kind of tag NAME ought to be. */
tree
-start_struct (code, name)
- enum tree_code code;
- tree name;
+start_struct (enum tree_code code, tree name)
{
- /* If there is already a tag defined at this binding level
+ /* If there is already a tag defined at this scope
(as a forward reference), just return it. */
tree ref = 0;
if (name != 0)
- ref = lookup_tag (code, name, current_binding_level, 1);
+ ref = lookup_tag (code, name, 1);
if (ref && TREE_CODE (ref) == code)
{
- C_TYPE_BEING_DEFINED (ref) = 1;
- TYPE_PACKED (ref) = flag_pack_struct;
- if (TYPE_FIELDS (ref))
- {
+ if (TYPE_SIZE (ref))
+ {
if (code == UNION_TYPE)
- error ("redefinition of `union %s'",
- IDENTIFIER_POINTER (name));
- else
- error ("redefinition of `struct %s'",
- IDENTIFIER_POINTER (name));
- }
-
- return ref;
+ error ("redefinition of %<union %E%>", name);
+ else
+ error ("redefinition of %<struct %E%>", name);
+ /* Don't create structures using a name already in use. */
+ ref = NULL_TREE;
+ }
+ else if (C_TYPE_BEING_DEFINED (ref))
+ {
+ if (code == UNION_TYPE)
+ error ("nested redefinition of %<union %E%>", name);
+ else
+ error ("nested redefinition of %<struct %E%>", name);
+ /* Don't create structures that contain themselves. */
+ ref = NULL_TREE;
+ }
}
/* Otherwise create a forward-reference just so the tag is in scope. */
- ref = make_node (code);
- pushtag (name, ref);
+ if (ref == NULL_TREE || TREE_CODE (ref) != code)
+ {
+ ref = make_node (code);
+ pushtag (name, ref);
+ }
+
C_TYPE_BEING_DEFINED (ref) = 1;
TYPE_PACKED (ref) = flag_pack_struct;
return ref;
}
-/* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
+/* Process the specs, declarator and width (NULL if omitted)
of a structure component, returning a FIELD_DECL node.
- WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
+ WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
+ DECL_ATTRS is as for grokdeclarator.
+
+ LOC is the location of the structure component.
This is done during the parsing of the struct declaration.
The FIELD_DECL nodes are chained together and the lot of them
are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
tree
-grokfield (filename, line, declarator, declspecs, width)
- const char *filename ATTRIBUTE_UNUSED;
- int line ATTRIBUTE_UNUSED;
- tree declarator, declspecs, width;
+grokfield (location_t loc,
+ struct c_declarator *declarator, struct c_declspecs *declspecs,
+ tree width, tree *decl_attrs)
{
tree value;
- if (declarator == NULL_TREE && width == NULL_TREE)
+ if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
+ && width == NULL_TREE)
{
- /* This is an unnamed decl. We only support unnamed
- structs/unions, so check for other things and refuse them. */
- tree type = TREE_VALUE (declspecs);
+ /* This is an unnamed decl.
+
+ If we have something of the form "union { list } ;" then this
+ is the anonymous union extension. Similarly for struct.
+
+ If this is something of the form "struct foo;", then
+ If MS extensions are enabled, this is handled as an
+ anonymous struct.
+ Otherwise this is a forward declaration of a structure tag.
+
+ If this is something of the form "foo;" and foo is a TYPE_DECL, then
+ If MS extensions are enabled and foo names a structure, then
+ again this is an anonymous struct.
+ Otherwise this is an error.
+
+ Oh what a horrid tangled web we weave. I wonder if MS consciously
+ took this from Plan 9 or if it was an accident of implementation
+ that took root before someone noticed the bug... */
+
+ tree type = declspecs->type;
+ bool type_ok = (TREE_CODE (type) == RECORD_TYPE
+ || TREE_CODE (type) == UNION_TYPE);
+ bool ok = false;
- if (TREE_CODE (type) == TYPE_DECL)
- type = TREE_TYPE (type);
- if (TREE_CODE (type) != RECORD_TYPE && TREE_CODE (type) != UNION_TYPE)
+ if (type_ok
+ && (flag_ms_extensions || !declspecs->typedef_p))
{
- error ("unnamed fields of type other than struct or union are not allowed");
+ if (flag_ms_extensions)
+ ok = true;
+ else if (flag_iso)
+ ok = false;
+ else if (TYPE_NAME (type) == NULL)
+ ok = true;
+ else
+ ok = false;
+ }
+ if (!ok)
+ {
+ pedwarn (loc, 0, "declaration does not declare anything");
return NULL_TREE;
}
+ pedwarn (loc, OPT_pedantic, "ISO C doesn%'t support unnamed structs/unions");
}
- value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
+ value = grokdeclarator (declarator, declspecs, FIELD, false,
+ width ? &width : NULL, decl_attrs,
+ DEPRECATED_NORMAL);
finish_decl (value, NULL_TREE, NULL_TREE);
DECL_INITIAL (value) = width;
- maybe_objc_check_decl (value);
return value;
}
\f
+/* Generate an error for any duplicate field names in FIELDLIST. Munge
+ the list such that this does not present a problem later. */
+
+static void
+detect_field_duplicates (tree fieldlist)
+{
+ tree x, y;
+ int timeout = 10;
+
+ /* First, see if there are more than "a few" fields.
+ This is trivially true if there are zero or one fields. */
+ if (!fieldlist)
+ return;
+ x = TREE_CHAIN (fieldlist);
+ if (!x)
+ return;
+ do {
+ timeout--;
+ x = TREE_CHAIN (x);
+ } while (timeout > 0 && x);
+
+ /* If there were "few" fields, avoid the overhead of allocating
+ a hash table. Instead just do the nested traversal thing. */
+ if (timeout > 0)
+ {
+ for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
+ if (DECL_NAME (x))
+ {
+ for (y = fieldlist; y != x; y = TREE_CHAIN (y))
+ if (DECL_NAME (y) == DECL_NAME (x))
+ {
+ error ("duplicate member %q+D", x);
+ DECL_NAME (x) = NULL_TREE;
+ }
+ }
+ }
+ else
+ {
+ htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
+ void **slot;
+
+ for (x = fieldlist; x ; x = TREE_CHAIN (x))
+ if ((y = DECL_NAME (x)) != 0)
+ {
+ slot = htab_find_slot (htab, y, INSERT);
+ if (*slot)
+ {
+ error ("duplicate member %q+D", x);
+ DECL_NAME (x) = NULL_TREE;
+ }
+ *slot = y;
+ }
+
+ htab_delete (htab);
+ }
+}
+
/* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
FIELDLIST is a chain of FIELD_DECL nodes for the fields.
ATTRIBUTES are attributes to be applied to the structure. */
tree
-finish_struct (t, fieldlist, attributes)
- tree t;
- tree fieldlist;
- tree attributes;
+finish_struct (tree t, tree fieldlist, tree attributes)
{
tree x;
- int toplevel = global_binding_level == current_binding_level;
+ bool toplevel = file_scope == current_scope;
int saw_named_field;
/* If this type was previously laid out as a forward reference,
decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
- /* Nameless union parm types are useful as GCC extension. */
- if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
- /* Otherwise, warn about any struct or union def. in parmlist. */
- if (in_parm_level_p ())
- {
- if (pedantic)
- pedwarn ("%s defined inside parms",
- TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
- else if (! flag_traditional)
- warning ("%s defined inside parms",
- TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
- }
-
if (pedantic)
{
for (x = fieldlist; x; x = TREE_CHAIN (x))
break;
if (x == 0)
- pedwarn ("%s has no %s",
- TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
- fieldlist ? _("named members") : _("members"));
+ {
+ if (TREE_CODE (t) == UNION_TYPE)
+ {
+ if (fieldlist)
+ pedwarn (input_location, OPT_pedantic, "union has no named members");
+ else
+ pedwarn (input_location, OPT_pedantic, "union has no members");
+ }
+ else
+ {
+ if (fieldlist)
+ pedwarn (input_location, OPT_pedantic, "struct has no named members");
+ else
+ pedwarn (input_location, OPT_pedantic, "struct has no members");
+ }
+ }
}
/* Install struct as DECL_CONTEXT of each field decl.
- Also process specified field sizes,m which is found in the DECL_INITIAL.
- Store 0 there, except for ": 0" fields (so we can find them
- and delete them, below). */
+ Also process specified field sizes, found in the DECL_INITIAL,
+ storing 0 there after the type has been changed to precision equal
+ to its width, rather than the precision of the specified standard
+ type. (Correct layout requires the original type to have been preserved
+ until now.) */
saw_named_field = 0;
for (x = fieldlist; x; x = TREE_CHAIN (x))
{
+ if (TREE_TYPE (x) == error_mark_node)
+ continue;
+
DECL_CONTEXT (x) = t;
- DECL_PACKED (x) |= TYPE_PACKED (t);
/* If any field is const, the structure type is pseudo-const. */
if (TREE_READONLY (x))
if (C_DECL_VARIABLE_SIZE (x))
C_TYPE_VARIABLE_SIZE (t) = 1;
- /* Detect invalid nested redefinition. */
- if (TREE_TYPE (x) == t)
- error ("nested redefinition of `%s'",
- IDENTIFIER_POINTER (TYPE_NAME (t)));
-
- /* Detect invalid bit-field size. */
- if (DECL_INITIAL (x))
- STRIP_NOPS (DECL_INITIAL (x));
- if (DECL_INITIAL (x))
- {
- if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
- constant_expression_warning (DECL_INITIAL (x));
- else
- {
- error_with_decl (x,
- "bit-field `%s' width not an integer constant");
- DECL_INITIAL (x) = NULL;
- }
- }
-
- /* Detect invalid bit-field type. */
- if (DECL_INITIAL (x)
- && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
- && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
- && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
- {
- error_with_decl (x, "bit-field `%s' has invalid type");
- DECL_INITIAL (x) = NULL;
- }
-
- if (DECL_INITIAL (x) && pedantic
- && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
- && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
- && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
- /* Accept an enum that's equivalent to int or unsigned int. */
- && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
- && (TYPE_PRECISION (TREE_TYPE (x))
- == TYPE_PRECISION (integer_type_node))))
- pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
-
- /* Detect and ignore out of range field width and process valid
- field widths. */
if (DECL_INITIAL (x))
{
- int max_width
- = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
- ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
-
- if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
- error_with_decl (x, "negative width in bit-field `%s'");
- else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
- pedwarn_with_decl (x, "width of `%s' exceeds its type");
- else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
- error_with_decl (x, "zero width for bit-field `%s'");
- else
- {
- /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
- unsigned HOST_WIDE_INT width
- = tree_low_cst (DECL_INITIAL (x), 1);
-
- if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
- && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
- TREE_UNSIGNED (TREE_TYPE (x)))
- || (width
- < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
- TREE_UNSIGNED (TREE_TYPE (x))))))
- warning_with_decl (x,
- "`%s' is narrower than values of its type");
-
- DECL_SIZE (x) = bitsize_int (width);
- DECL_BIT_FIELD (x) = 1;
- SET_DECL_C_BIT_FIELD (x);
-
- if (width == 0
- && ! (* targetm.ms_bitfield_layout_p) (t))
- {
- /* field size 0 => force desired amount of alignment. */
-#ifdef EMPTY_FIELD_BOUNDARY
- DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
-#endif
-#ifdef PCC_BITFIELD_TYPE_MATTERS
- if (PCC_BITFIELD_TYPE_MATTERS)
- {
- DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
- TYPE_ALIGN (TREE_TYPE (x)));
- DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
- }
-#endif
- }
- }
- }
-
- else if (TREE_TYPE (x) != error_mark_node)
- {
- unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
- : TYPE_ALIGN (TREE_TYPE (x)));
-
- /* Non-bit-fields are aligned for their type, except packed
- fields which require only BITS_PER_UNIT alignment. */
- DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
- if (! DECL_PACKED (x))
- DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
+ unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
+ DECL_SIZE (x) = bitsize_int (width);
+ DECL_BIT_FIELD (x) = 1;
+ SET_DECL_C_BIT_FIELD (x);
}
- DECL_INITIAL (x) = 0;
+ if (TYPE_PACKED (t)
+ && (DECL_BIT_FIELD (x)
+ || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
+ DECL_PACKED (x) = 1;
/* Detect flexible array member in an invalid context. */
if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
&& TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
{
if (TREE_CODE (t) == UNION_TYPE)
- error_with_decl (x, "flexible array member in union");
+ {
+ error ("%Jflexible array member in union", x);
+ TREE_TYPE (x) = error_mark_node;
+ }
else if (TREE_CHAIN (x) != NULL_TREE)
- error_with_decl (x, "flexible array member not at end of struct");
- else if (! saw_named_field)
- error_with_decl (x, "flexible array member in otherwise empty struct");
+ {
+ error ("%Jflexible array member not at end of struct", x);
+ TREE_TYPE (x) = error_mark_node;
+ }
+ else if (!saw_named_field)
+ {
+ error ("%Jflexible array member in otherwise empty struct", x);
+ TREE_TYPE (x) = error_mark_node;
+ }
}
+
+ if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
+ && flexible_array_type_p (TREE_TYPE (x)))
+ pedwarn (input_location, OPT_pedantic,
+ "%Jinvalid use of structure with flexible array member", x);
+
if (DECL_NAME (x))
saw_named_field = 1;
}
- /* Delete all duplicate fields from the fieldlist */
- for (x = fieldlist; x && TREE_CHAIN (x);)
- /* Anonymous fields aren't duplicates. */
- if (DECL_NAME (TREE_CHAIN (x)) == 0)
- x = TREE_CHAIN (x);
- else
- {
- tree y = fieldlist;
-
- while (1)
- {
- if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
- break;
- if (y == x)
- break;
- y = TREE_CHAIN (y);
- }
- if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
- {
- error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
- TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
- }
- else
- x = TREE_CHAIN (x);
- }
+ detect_field_duplicates (fieldlist);
/* Now we have the nearly final fieldlist. Record it,
then lay out the structure or union (including the fields). */
layout_type (t);
- /* Delete all zero-width bit-fields from the fieldlist */
+ /* Give bit-fields their proper types. */
{
tree *fieldlistp = &fieldlist;
while (*fieldlistp)
- if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
- *fieldlistp = TREE_CHAIN (*fieldlistp);
+ if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
+ && TREE_TYPE (*fieldlistp) != error_mark_node)
+ {
+ unsigned HOST_WIDE_INT width
+ = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
+ tree type = TREE_TYPE (*fieldlistp);
+ if (width != TYPE_PRECISION (type))
+ {
+ TREE_TYPE (*fieldlistp)
+ = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
+ DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
+ }
+ DECL_INITIAL (*fieldlistp) = 0;
+ }
else
fieldlistp = &TREE_CHAIN (*fieldlistp);
}
TYPE_FIELDS (t) = fieldlist;
+ /* If there are lots of fields, sort so we can look through them fast.
+ We arbitrarily consider 16 or more elts to be "a lot". */
+
+ {
+ int len = 0;
+
+ for (x = fieldlist; x; x = TREE_CHAIN (x))
+ {
+ if (len > 15 || DECL_NAME (x) == NULL)
+ break;
+ len += 1;
+ }
+
+ if (len > 15)
+ {
+ tree *field_array;
+ struct lang_type *space;
+ struct sorted_fields_type *space2;
+
+ len += list_length (x);
+
+ /* Use the same allocation policy here that make_node uses, to
+ ensure that this lives as long as the rest of the struct decl.
+ All decls in an inline function need to be saved. */
+
+ space = GGC_CNEW (struct lang_type);
+ space2 = GGC_NEWVAR (struct sorted_fields_type,
+ sizeof (struct sorted_fields_type) + len * sizeof (tree));
+
+ len = 0;
+ space->s = space2;
+ field_array = &space2->elts[0];
+ for (x = fieldlist; x; x = TREE_CHAIN (x))
+ {
+ field_array[len++] = x;
+
+ /* If there is anonymous struct or union, break out of the loop. */
+ if (DECL_NAME (x) == NULL)
+ break;
+ }
+ /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
+ if (x == NULL)
+ {
+ TYPE_LANG_SPECIFIC (t) = space;
+ TYPE_LANG_SPECIFIC (t)->s->len = len;
+ field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
+ qsort (field_array, len, sizeof (tree), field_decl_cmp);
+ }
+ }
+ }
+
for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
{
TYPE_FIELDS (x) = TYPE_FIELDS (t);
TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
- TYPE_ALIGN (x) = TYPE_ALIGN (t);
- TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
+ C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
+ C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
+ C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
}
/* If this was supposed to be a transparent union, but we can't
make it one, warn and turn off the flag. */
if (TREE_CODE (t) == UNION_TYPE
&& TYPE_TRANSPARENT_UNION (t)
- && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
+ && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
{
TYPE_TRANSPARENT_UNION (t) = 0;
- warning ("union cannot be made transparent");
+ warning (0, "union cannot be made transparent");
}
/* If this structure or union completes the type of any previous
variable declaration, lay it out and output its rtl. */
-
- if (current_binding_level->n_incomplete != 0)
- {
- tree decl;
- for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
+ for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
+ x;
+ x = TREE_CHAIN (x))
+ {
+ tree decl = TREE_VALUE (x);
+ if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
+ layout_array_type (TREE_TYPE (decl));
+ if (TREE_CODE (decl) != TYPE_DECL)
{
- if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
- && TREE_CODE (decl) != TYPE_DECL)
- {
- layout_decl (decl, 0);
- /* This is a no-op in c-lang.c or something real in objc-actions.c. */
- maybe_objc_check_decl (decl);
- rest_of_decl_compilation (decl, NULL, toplevel, 0);
- if (! toplevel)
- expand_decl (decl);
- if (--current_binding_level->n_incomplete == 0)
- break;
- }
- else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
- && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
- {
- tree element = TREE_TYPE (decl);
- while (TREE_CODE (element) == ARRAY_TYPE)
- element = TREE_TYPE (element);
- if (element == t)
- {
- layout_array_type (TREE_TYPE (decl));
- if (TREE_CODE (decl) != TYPE_DECL)
- {
- layout_decl (decl, 0);
- maybe_objc_check_decl (decl);
- rest_of_decl_compilation (decl, NULL, toplevel, 0);
- if (! toplevel)
- expand_decl (decl);
- }
- if (--current_binding_level->n_incomplete == 0)
- break;
- }
- }
+ layout_decl (decl, 0);
+ if (c_dialect_objc ())
+ objc_check_decl (decl);
+ rest_of_decl_compilation (decl, toplevel, 0);
+ if (!toplevel)
+ expand_decl (decl);
}
}
+ C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
/* Finish debugging output for this type. */
rest_of_type_compilation (t, toplevel);
+ /* If we're inside a function proper, i.e. not file-scope and not still
+ parsing parameters, then arrange for the size of a variable sized type
+ to be bound now. */
+ if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
+ add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
+
return t;
}
/* Lay out the type T, and its element type, and so on. */
static void
-layout_array_type (t)
- tree t;
+layout_array_type (tree t)
{
if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
layout_array_type (TREE_TYPE (t));
may be used to declare the individual values as they are read. */
tree
-start_enum (name)
- tree name;
+start_enum (struct c_enum_contents *the_enum, tree name)
{
tree enumtype = 0;
forward reference. */
if (name != 0)
- enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
+ enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
{
pushtag (name, enumtype);
}
+ if (C_TYPE_BEING_DEFINED (enumtype))
+ error ("nested redefinition of %<enum %E%>", name);
+
C_TYPE_BEING_DEFINED (enumtype) = 1;
if (TYPE_VALUES (enumtype) != 0)
{
/* This enum is a named one that has been declared already. */
- error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
+ error ("redeclaration of %<enum %E%>", name);
/* Completely replace its old definition.
The old enumerators remain defined, however. */
TYPE_VALUES (enumtype) = 0;
}
- enum_next_value = integer_zero_node;
- enum_overflow = 0;
+ the_enum->enum_next_value = integer_zero_node;
+ the_enum->enum_overflow = 0;
if (flag_short_enums)
TYPE_PACKED (enumtype) = 1;
Returns ENUMTYPE. */
tree
-finish_enum (enumtype, values, attributes)
- tree enumtype;
- tree values;
- tree attributes;
+finish_enum (tree enumtype, tree values, tree attributes)
{
tree pair, tem;
- tree minnode = 0, maxnode = 0, enum_value_type;
+ tree minnode = 0, maxnode = 0;
int precision, unsign;
- int toplevel = (global_binding_level == current_binding_level);
-
- if (in_parm_level_p ())
- warning ("enum defined inside parms");
+ bool toplevel = (file_scope == current_scope);
+ struct lang_type *lt;
decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
that normally we only go as narrow as int - and signed iff any of
the values are negative. */
unsign = (tree_int_cst_sgn (minnode) >= 0);
- precision = MAX (min_precision (minnode, unsign),
- min_precision (maxnode, unsign));
+ precision = MAX (tree_int_cst_min_precision (minnode, unsign),
+ tree_int_cst_min_precision (maxnode, unsign));
+
if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
{
- tree narrowest = type_for_size (precision, unsign);
- if (narrowest == 0)
+ tem = c_common_type_for_size (precision, unsign);
+ if (tem == NULL)
{
- warning ("enumeration values exceed range of largest integer");
- narrowest = long_long_integer_type_node;
+ warning (0, "enumeration values exceed range of largest integer");
+ tem = long_long_integer_type_node;
}
-
- precision = TYPE_PRECISION (narrowest);
}
else
- precision = TYPE_PRECISION (integer_type_node);
+ tem = unsign ? unsigned_type_node : integer_type_node;
+
+ TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
+ TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
+ TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
+ TYPE_SIZE (enumtype) = 0;
- if (precision == TYPE_PRECISION (integer_type_node))
- enum_value_type = type_for_size (precision, 0);
+ /* If the precision of the type was specific with an attribute and it
+ was too small, give an error. Otherwise, use it. */
+ if (TYPE_PRECISION (enumtype))
+ {
+ if (precision > TYPE_PRECISION (enumtype))
+ error ("specified mode too small for enumeral values");
+ }
else
- enum_value_type = enumtype;
+ TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
- TYPE_MIN_VALUE (enumtype) = minnode;
- TYPE_MAX_VALUE (enumtype) = maxnode;
- TYPE_PRECISION (enumtype) = precision;
- TREE_UNSIGNED (enumtype) = unsign;
- TYPE_SIZE (enumtype) = 0;
layout_type (enumtype);
if (values != error_mark_node)
for (pair = values; pair; pair = TREE_CHAIN (pair))
{
tree enu = TREE_PURPOSE (pair);
+ tree ini = DECL_INITIAL (enu);
TREE_TYPE (enu) = enumtype;
- DECL_SIZE (enu) = TYPE_SIZE (enumtype);
- DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
- DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
- DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
- DECL_MODE (enu) = TYPE_MODE (enumtype);
/* The ISO C Standard mandates enumerators to have type int,
even though the underlying type of an enum type is
- unspecified. Here we convert any enumerators that fit in
- an int to type int, to avoid promotions to unsigned types
- when comparing integers with enumerators that fit in the
- int range. When -pedantic is given, build_enumerator()
- would have already taken care of those that don't fit. */
- if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
- DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
- else
- DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
-
+ unspecified. However, GCC allows enumerators of any
+ integer type as an extensions. build_enumerator()
+ converts any enumerators that fit in an int to type int,
+ to avoid promotions to unsigned types when comparing
+ integers with enumerators that fit in the int range.
+ When -pedantic is given, build_enumerator() would have
+ already warned about those that don't fit. Here we
+ convert the rest to the enumerator type. */
+ if (TREE_TYPE (ini) != integer_type_node)
+ ini = convert (enumtype, ini);
+
+ DECL_INITIAL (enu) = ini;
TREE_PURPOSE (pair) = DECL_NAME (enu);
- TREE_VALUE (pair) = DECL_INITIAL (enu);
+ TREE_VALUE (pair) = ini;
}
TYPE_VALUES (enumtype) = values;
}
+ /* Record the min/max values so that we can warn about bit-field
+ enumerations that are too small for the values. */
+ lt = GGC_CNEW (struct lang_type);
+ lt->enum_min = minnode;
+ lt->enum_max = maxnode;
+ TYPE_LANG_SPECIFIC (enumtype) = lt;
+
/* Fix up all variant types of this enum type. */
for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
{
TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
- TYPE_MODE (tem) = TYPE_MODE (enumtype);
+ SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
- TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
+ TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
+ TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
}
/* Finish debugging output for this type. */
Assignment of sequential values by default is handled here. */
tree
-build_enumerator (name, value)
- tree name, value;
+build_enumerator (struct c_enum_contents *the_enum, tree name, tree value,
+ location_t value_loc)
{
tree decl, type;
/* Validate and default VALUE. */
- /* Remove no-op casts from the value. */
- if (value)
- STRIP_TYPE_NOPS (value);
-
if (value != 0)
{
- if (TREE_CODE (value) == INTEGER_CST)
+ /* Don't issue more errors for error_mark_node (i.e. an
+ undeclared identifier) - just ignore the value expression. */
+ if (value == error_mark_node)
+ value = 0;
+ else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
+ || TREE_CODE (value) != INTEGER_CST)
{
- value = default_conversion (value);
- constant_expression_warning (value);
+ error ("enumerator value for %qE is not an integer constant", name);
+ value = 0;
}
else
{
- error ("enumerator value for `%s' not integer constant",
- IDENTIFIER_POINTER (name));
- value = 0;
+ value = default_conversion (value);
+ constant_expression_warning (value);
}
}
in the default. */
if (value == 0)
{
- value = enum_next_value;
- if (enum_overflow)
+ value = the_enum->enum_next_value;
+ if (the_enum->enum_overflow)
error ("overflow in enumeration values");
}
-
- if (pedantic && ! int_fits_type_p (value, integer_type_node))
- {
- pedwarn ("ISO C restricts enumerator values to range of `int'");
- value = convert (integer_type_node, value);
- }
+ /* Even though the underlying type of an enum is unspecified, the
+ type of enumeration constants is explicitly defined as int
+ (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
+ an extension. */
+ else if (!int_fits_type_p (value, integer_type_node))
+ pedwarn (value_loc, OPT_pedantic,
+ "ISO C restricts enumerator values to range of %<int%>");
+
+ /* The ISO C Standard mandates enumerators to have type int, even
+ though the underlying type of an enum type is unspecified.
+ However, GCC allows enumerators of any integer type as an
+ extensions. Here we convert any enumerators that fit in an int
+ to type int, to avoid promotions to unsigned types when comparing
+ integers with enumerators that fit in the int range. When
+ -pedantic is given, we would have already warned about those that
+ don't fit. We have to do this here rather than in finish_enum
+ because this value may be used to define more enumerators. */
+ if (int_fits_type_p (value, integer_type_node))
+ value = convert (integer_type_node, value);
/* Set basis for default for next value. */
- enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
- enum_overflow = tree_int_cst_lt (enum_next_value, value);
+ the_enum->enum_next_value
+ = build_binary_op
+ (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location,
+ PLUS_EXPR, value, integer_one_node, 0);
+ the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
/* Now create a declaration for the enum value name. */
type = TREE_TYPE (value);
- type = type_for_size (MAX (TYPE_PRECISION (type),
- TYPE_PRECISION (integer_type_node)),
- ((flag_traditional
- || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
- && TREE_UNSIGNED (type)));
+ type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
+ TYPE_PRECISION (integer_type_node)),
+ (TYPE_PRECISION (type)
+ >= TYPE_PRECISION (integer_type_node)
+ && TYPE_UNSIGNED (type)));
decl = build_decl (CONST_DECL, name, type);
DECL_INITIAL (decl) = convert (type, value);
yyparse to report a parse error. */
int
-start_function (declspecs, declarator, attributes)
- tree declarator, declspecs, attributes;
+start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
+ tree attributes)
{
tree decl1, old_decl;
- tree restype;
- int old_immediate_size_expand = immediate_size_expand;
+ tree restype, resdecl;
+ struct c_label_context_se *nstack_se;
+ struct c_label_context_vm *nstack_vm;
current_function_returns_value = 0; /* Assume, until we see it does. */
current_function_returns_null = 0;
current_function_returns_abnormally = 0;
warn_about_return_type = 0;
- current_extern_inline = 0;
- c_function_varargs = 0;
- named_labels = 0;
- shadowed_labels = 0;
+ c_switch_stack = NULL;
- /* Don't expand any sizes in the return type of the function. */
- immediate_size_expand = 0;
+ nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
+ nstack_se->labels_def = NULL;
+ nstack_se->labels_used = NULL;
+ nstack_se->next = label_context_stack_se;
+ label_context_stack_se = nstack_se;
- decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
+ nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
+ nstack_vm->labels_def = NULL;
+ nstack_vm->labels_used = NULL;
+ nstack_vm->scope = 0;
+ nstack_vm->next = label_context_stack_vm;
+ label_context_stack_vm = nstack_vm;
+
+ /* Indicate no valid break/continue context by setting these variables
+ to some non-null, non-label value. We'll notice and emit the proper
+ error message in c_finish_bc_stmt. */
+ c_break_label = c_cont_label = size_zero_node;
+
+ decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
+ &attributes, DEPRECATED_NORMAL);
/* If the declarator is not suitable for a function definition,
cause a syntax error. */
if (decl1 == 0)
{
- immediate_size_expand = old_immediate_size_expand;
+ label_context_stack_se = label_context_stack_se->next;
+ label_context_stack_vm = label_context_stack_vm->next;
return 0;
}
decl_attributes (&decl1, attributes, 0);
- /* If #pragma weak was used, mark the decl weak now. */
- if (current_binding_level == global_binding_level)
- maybe_apply_pragma_weak (decl1);
-
if (DECL_DECLARED_INLINE_P (decl1)
&& DECL_UNINLINABLE (decl1)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
- warning_with_decl (decl1,
- "inline function `%s' given attribute noinline");
+ warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
+ decl1);
+
+ /* Handle gnu_inline attribute. */
+ if (declspecs->inline_p
+ && !flag_gnu89_inline
+ && TREE_CODE (decl1) == FUNCTION_DECL
+ && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
+ || current_function_decl))
+ {
+ if (declspecs->storage_class != csc_static)
+ DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
+ }
announce_function (decl1);
}
if (warn_about_return_type)
- pedwarn_c99 ("return type defaults to `int'");
-
- /* Save the parm names or decls from this function's declarator
- where store_parm_decls will find them. */
- current_function_parms = last_function_parms;
- current_function_parm_tags = last_function_parm_tags;
+ pedwarn_c99 (input_location, flag_isoc99 ? 0
+ : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
+ "return type defaults to %<int%>");
/* Make the init_value nonzero so pushdecl knows this is not tentative.
- error_mark_node is replaced below (in poplevel) with the BLOCK. */
+ error_mark_node is replaced below (in pop_scope) with the BLOCK. */
DECL_INITIAL (decl1) = error_mark_node;
/* If this definition isn't a prototype and we had a prototype declaration
- before, copy the arg type info from that prototype.
- But not if what we had before was a builtin function. */
- old_decl = lookup_name_current_level (DECL_NAME (decl1));
- if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
- && !DECL_BUILT_IN (old_decl)
- && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
- == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
- && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
- {
- TREE_TYPE (decl1) = TREE_TYPE (old_decl);
- current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
- current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
+ before, copy the arg type info from that prototype. */
+ old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
+ if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
+ old_decl = 0;
+ current_function_prototype_locus = UNKNOWN_LOCATION;
+ current_function_prototype_built_in = false;
+ current_function_prototype_arg_types = NULL_TREE;
+ if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
+ {
+ if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
+ && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
+ TREE_TYPE (TREE_TYPE (old_decl))))
+ {
+ TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
+ TREE_TYPE (decl1));
+ current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
+ current_function_prototype_built_in
+ = C_DECL_BUILTIN_PROTOTYPE (old_decl);
+ current_function_prototype_arg_types
+ = TYPE_ARG_TYPES (TREE_TYPE (decl1));
+ }
+ if (TREE_PUBLIC (decl1))
+ {
+ /* If there is an external prototype declaration of this
+ function, record its location but do not copy information
+ to this decl. This may be an invisible declaration
+ (built-in or in a scope which has finished) or simply
+ have more refined argument types than any declaration
+ found above. */
+ struct c_binding *b;
+ for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
+ if (B_IN_SCOPE (b, external_scope))
+ break;
+ if (b)
+ {
+ tree ext_decl, ext_type;
+ ext_decl = b->decl;
+ ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
+ if (TREE_CODE (ext_type) == FUNCTION_TYPE
+ && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
+ TREE_TYPE (ext_type)))
+ {
+ current_function_prototype_locus
+ = DECL_SOURCE_LOCATION (ext_decl);
+ current_function_prototype_built_in
+ = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
+ current_function_prototype_arg_types
+ = TYPE_ARG_TYPES (ext_type);
+ }
+ }
+ }
}
- /* If there is no explicit declaration, look for any out-of-scope implicit
- declarations. */
- if (old_decl == 0)
- old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
-
/* Optionally warn of old-fashioned def with no previous prototype. */
if (warn_strict_prototypes
+ && old_decl != error_mark_node
&& TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
- && !(old_decl != 0
- && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
- || (DECL_BUILT_IN (old_decl)
- && ! C_DECL_ANTICIPATED (old_decl)))))
- warning ("function declaration isn't a prototype");
+ && C_DECL_ISNT_PROTOTYPE (old_decl))
+ warning (OPT_Wstrict_prototypes,
+ "function declaration isn%'t a prototype");
/* Optionally warn of any global def with no previous prototype. */
else if (warn_missing_prototypes
+ && old_decl != error_mark_node
&& TREE_PUBLIC (decl1)
- && !(old_decl != 0
- && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
- || (DECL_BUILT_IN (old_decl)
- && ! C_DECL_ANTICIPATED (old_decl))))
- && ! MAIN_NAME_P (DECL_NAME (decl1)))
- warning_with_decl (decl1, "no previous prototype for `%s'");
+ && !MAIN_NAME_P (DECL_NAME (decl1))
+ && C_DECL_ISNT_PROTOTYPE (old_decl))
+ warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
/* Optionally warn of any def with no previous prototype
if the function has already been used. */
else if (warn_missing_prototypes
- && old_decl != 0 && TREE_USED (old_decl)
+ && old_decl != 0
+ && old_decl != error_mark_node
+ && TREE_USED (old_decl)
&& TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
- warning_with_decl (decl1,
- "`%s' was used with no prototype before its definition");
+ warning (OPT_Wmissing_prototypes,
+ "%q+D was used with no prototype before its definition", decl1);
/* Optionally warn of any global def with no previous declaration. */
else if (warn_missing_declarations
&& TREE_PUBLIC (decl1)
&& old_decl == 0
- && ! MAIN_NAME_P (DECL_NAME (decl1)))
- warning_with_decl (decl1, "no previous declaration for `%s'");
+ && !MAIN_NAME_P (DECL_NAME (decl1)))
+ warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
+ decl1);
/* Optionally warn of any def with no previous declaration
if the function has already been used. */
else if (warn_missing_declarations
- && old_decl != 0 && TREE_USED (old_decl)
- && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
- warning_with_decl (decl1,
- "`%s' was used with no declaration before its definition");
-
- /* This is a definition, not a reference.
- So normally clear DECL_EXTERNAL.
- However, `extern inline' acts like a declaration
- except for defining how to inline. So set DECL_EXTERNAL in that case. */
- DECL_EXTERNAL (decl1) = current_extern_inline;
+ && old_decl != 0
+ && old_decl != error_mark_node
+ && TREE_USED (old_decl)
+ && C_DECL_IMPLICIT (old_decl))
+ warning (OPT_Wmissing_declarations,
+ "%q+D was used with no declaration before its definition", decl1);
/* This function exists in static storage.
(This does not mean `static' in the C sense!) */
if (current_function_decl != 0)
TREE_PUBLIC (decl1) = 0;
+ /* This is the earliest point at which we might know the assembler
+ name of the function. Thus, if it's set before this, die horribly. */
+ gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
+
+ /* If #pragma weak was used, mark the decl weak now. */
+ if (current_scope == file_scope)
+ maybe_apply_pragma_weak (decl1);
+
/* Warn for unlikely, improbable, or stupid declarations of `main'. */
- if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
+ if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
{
- tree args;
- int argct = 0;
-
if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
!= integer_type_node)
- pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
-
- for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
- args = TREE_CHAIN (args))
- {
- tree type = args ? TREE_VALUE (args) : 0;
-
- if (type == void_type_node)
- break;
-
- ++argct;
- switch (argct)
- {
- case 1:
- if (TYPE_MAIN_VARIANT (type) != integer_type_node)
- pedwarn_with_decl (decl1,
- "first argument of `%s' should be `int'");
- break;
-
- case 2:
- if (TREE_CODE (type) != POINTER_TYPE
- || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
- || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
- != char_type_node))
- pedwarn_with_decl (decl1,
- "second argument of `%s' should be `char **'");
- break;
-
- case 3:
- if (TREE_CODE (type) != POINTER_TYPE
- || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
- || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
- != char_type_node))
- pedwarn_with_decl (decl1,
- "third argument of `%s' should probably be `char **'");
- break;
- }
- }
+ pedwarn (input_location, OPT_Wmain, "return type of %q+D is not %<int%>", decl1);
- /* It is intentional that this message does not mention the third
- argument because it's only mentioned in an appendix of the
- standard. */
- if (argct > 0 && (argct < 2 || argct > 3))
- pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
+ check_main_parameter_types (decl1);
- if (! TREE_PUBLIC (decl1))
- pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
+ if (!TREE_PUBLIC (decl1))
+ pedwarn (input_location, OPT_Wmain, "%q+D is normally a non-static function", decl1);
}
/* Record the decl so that the function name is defined.
current_function_decl = pushdecl (decl1);
- pushlevel (0);
- declare_parm_level (1);
- current_binding_level->subblocks_tag_transparent = 1;
-
- make_decl_rtl (current_function_decl, NULL);
+ push_scope ();
+ declare_parm_level ();
restype = TREE_TYPE (TREE_TYPE (current_function_decl));
- /* Promote the value to int before returning it. */
- if (c_promoting_integer_type_p (restype))
- {
- /* It retains unsignedness if traditional
- or if not really getting wider. */
- if (TREE_UNSIGNED (restype)
- && (flag_traditional
- || (TYPE_PRECISION (restype)
- == TYPE_PRECISION (integer_type_node))))
- restype = unsigned_type_node;
- else
- restype = integer_type_node;
- }
- DECL_RESULT (current_function_decl)
- = build_decl (RESULT_DECL, NULL_TREE, restype);
-
- /* If this fcn was already referenced via a block-scope `extern' decl
- (or an implicit decl), propagate certain information about the usage. */
- if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
- TREE_ADDRESSABLE (current_function_decl) = 1;
-
- immediate_size_expand = old_immediate_size_expand;
+ resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
+ DECL_ARTIFICIAL (resdecl) = 1;
+ DECL_IGNORED_P (resdecl) = 1;
+ DECL_RESULT (current_function_decl) = resdecl;
start_fname_decls ();
-
- return 1;
-}
-
-/* Record that this function is going to be a varargs function.
- This is called before store_parm_decls, which is too early
- to call mark_varargs directly. */
-void
-c_mark_varargs ()
-{
- c_function_varargs = 1;
+ return 1;
}
\f
-/* Store the parameter declarations into the current function declaration.
- This is called after parsing the parameter declarations, before
- digesting the body of the function.
-
- For an old-style definition, modify the function's type
- to specify at least the number of arguments. */
-
-void
-store_parm_decls ()
+/* Subroutine of store_parm_decls which handles new-style function
+ definitions (prototype format). The parms already have decls, so we
+ need only record them as in effect and complain if any redundant
+ old-style parm decls were written. */
+static void
+store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
{
- tree fndecl = current_function_decl;
- tree parm;
-
- /* This is either a chain of PARM_DECLs (if a prototype was used)
- or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
- tree specparms = current_function_parms;
-
- /* This is a list of types declared among parms in a prototype. */
- tree parmtags = current_function_parm_tags;
+ tree decl;
- /* This is a chain of PARM_DECLs from old-style parm declarations. */
- tree parmdecls = getdecls ();
+ if (current_scope->bindings)
+ {
+ error ("%Jold-style parameter declarations in prototyped "
+ "function definition", fndecl);
- /* This is a chain of any other decls that came in among the parm
- declarations. If a parm is declared with enum {foo, bar} x;
- then CONST_DECLs for foo and bar are put here. */
- tree nonparms = 0;
+ /* Get rid of the old-style declarations. */
+ pop_scope ();
+ push_scope ();
+ }
+ /* Don't issue this warning for nested functions, and don't issue this
+ warning if we got here because ARG_INFO_TYPES was error_mark_node
+ (this happens when a function definition has just an ellipsis in
+ its parameter list). */
+ else if (!in_system_header && !current_function_scope
+ && arg_info->types != error_mark_node)
+ warning (OPT_Wtraditional,
+ "%Jtraditional C rejects ISO C style function definitions",
+ fndecl);
- /* The function containing FNDECL, if any. */
- tree context = decl_function_context (fndecl);
+ /* Now make all the parameter declarations visible in the function body.
+ We can bypass most of the grunt work of pushdecl. */
+ for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
+ {
+ DECL_CONTEXT (decl) = current_function_decl;
+ if (DECL_NAME (decl))
+ {
+ bind (DECL_NAME (decl), decl, current_scope,
+ /*invisible=*/false, /*nested=*/false);
+ if (!TREE_USED (decl))
+ warn_if_shadowing (decl);
+ }
+ else
+ error ("%Jparameter name omitted", decl);
+ }
- /* Nonzero if this definition is written with a prototype. */
- int prototype = 0;
+ /* Record the parameter list in the function declaration. */
+ DECL_ARGUMENTS (fndecl) = arg_info->parms;
- int saved_warn_shadow = warn_shadow;
+ /* Now make all the ancillary declarations visible, likewise. */
+ for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
+ {
+ DECL_CONTEXT (decl) = current_function_decl;
+ if (DECL_NAME (decl))
+ bind (DECL_NAME (decl), decl, current_scope,
+ /*invisible=*/false, /*nested=*/false);
+ }
- /* Don't re-emit shadow warnings. */
- warn_shadow = 0;
+ /* And all the tag declarations. */
+ for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
+ if (TREE_PURPOSE (decl))
+ bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
+ /*invisible=*/false, /*nested=*/false);
+}
- if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
- {
- /* This case is when the function was defined with an ANSI prototype.
- The parms already have decls, so we need not do anything here
- except record them as in effect
- and complain if any redundant old-style parm decls were written. */
+/* Subroutine of store_parm_decls which handles old-style function
+ definitions (separate parameter list and declarations). */
- tree next;
- tree others = 0;
+static void
+store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
+{
+ struct c_binding *b;
+ tree parm, decl, last;
+ tree parmids = arg_info->parms;
+ struct pointer_set_t *seen_args = pointer_set_create ();
- prototype = 1;
+ if (!in_system_header)
+ warning (OPT_Wold_style_definition, "%Jold-style function definition",
+ fndecl);
- if (parmdecls != 0)
+ /* Match each formal parameter name with its declaration. Save each
+ decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
+ for (parm = parmids; parm; parm = TREE_CHAIN (parm))
+ {
+ if (TREE_VALUE (parm) == 0)
{
- tree decl, link;
-
- error_with_decl (fndecl,
- "parm types given both in parmlist and separately");
- /* Get rid of the erroneous decls; don't keep them on
- the list of parms, since they might not be PARM_DECLs. */
- for (decl = current_binding_level->names;
- decl; decl = TREE_CHAIN (decl))
- if (DECL_NAME (decl))
- IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
- for (link = current_binding_level->shadowed;
- link; link = TREE_CHAIN (link))
- IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
- current_binding_level->names = 0;
- current_binding_level->shadowed = 0;
+ error ("%Jparameter name missing from parameter list", fndecl);
+ TREE_PURPOSE (parm) = 0;
+ continue;
}
- specparms = nreverse (specparms);
- for (parm = specparms; parm; parm = next)
+ b = I_SYMBOL_BINDING (TREE_VALUE (parm));
+ if (b && B_IN_CURRENT_SCOPE (b))
{
- next = TREE_CHAIN (parm);
- if (TREE_CODE (parm) == PARM_DECL)
+ decl = b->decl;
+ /* If we got something other than a PARM_DECL it is an error. */
+ if (TREE_CODE (decl) != PARM_DECL)
+ error ("%q+D declared as a non-parameter", decl);
+ /* If the declaration is already marked, we have a duplicate
+ name. Complain and ignore the duplicate. */
+ else if (pointer_set_contains (seen_args, decl))
{
- if (DECL_NAME (parm) == 0)
- error_with_decl (parm, "parameter name omitted");
- else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
- && VOID_TYPE_P (TREE_TYPE (parm)))
- {
- error_with_decl (parm, "parameter `%s' declared void");
- /* Change the type to error_mark_node so this parameter
- will be ignored by assign_parms. */
- TREE_TYPE (parm) = error_mark_node;
- }
- pushdecl (parm);
+ error ("multiple parameters named %q+D", decl);
+ TREE_PURPOSE (parm) = 0;
+ continue;
}
- else
+ /* If the declaration says "void", complain and turn it into
+ an int. */
+ else if (VOID_TYPE_P (TREE_TYPE (decl)))
{
- /* If we find an enum constant or a type tag,
- put it aside for the moment. */
- TREE_CHAIN (parm) = 0;
- others = chainon (others, parm);
+ error ("parameter %q+D declared with void type", decl);
+ TREE_TYPE (decl) = integer_type_node;
+ DECL_ARG_TYPE (decl) = integer_type_node;
+ layout_decl (decl, 0);
}
+ warn_if_shadowing (decl);
}
-
- /* Get the decls in their original chain order
- and record in the function. */
- DECL_ARGUMENTS (fndecl) = getdecls ();
-
-#if 0
- /* If this function takes a variable number of arguments,
- add a phony parameter to the end of the parm list,
- to represent the position of the first unnamed argument. */
- if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
- != void_type_node)
+ /* If no declaration found, default to int. */
+ else
{
- tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
- /* Let's hope the address of the unnamed parm
- won't depend on its type. */
- TREE_TYPE (dummy) = integer_type_node;
- DECL_ARG_TYPE (dummy) = integer_type_node;
- DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
- }
-#endif
+ decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
+ DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
+ DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
+ pushdecl (decl);
+ warn_if_shadowing (decl);
- /* Now pushdecl the enum constants. */
- for (parm = others; parm; parm = next)
- {
- next = TREE_CHAIN (parm);
- if (DECL_NAME (parm) == 0)
- ;
- else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
- ;
- else if (TREE_CODE (parm) != PARM_DECL)
- pushdecl (parm);
+ if (flag_isoc99)
+ pedwarn (input_location, 0, "type of %q+D defaults to %<int%>", decl);
+ else
+ warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
}
- storetags (chainon (parmtags, gettags ()));
+ TREE_PURPOSE (parm) = decl;
+ pointer_set_insert (seen_args, decl);
}
- else
- {
- /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
- each with a parm name as the TREE_VALUE.
- PARMDECLS is a chain of declarations for parameters.
- Warning! It can also contain CONST_DECLs which are not parameters
- but are names of enumerators of any enum types
- declared among the parameters.
+ /* Now examine the parms chain for incomplete declarations
+ and declarations with no corresponding names. */
- First match each formal parameter name with its declaration.
- Associate decls with the names and store the decls
- into the TREE_PURPOSE slots. */
-
- /* We use DECL_WEAK as a flag to show which parameters have been
- seen already since it is not used on PARM_DECL or CONST_DECL. */
- for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
- DECL_WEAK (parm) = 0;
+ for (b = current_scope->bindings; b; b = b->prev)
+ {
+ parm = b->decl;
+ if (TREE_CODE (parm) != PARM_DECL)
+ continue;
- for (parm = specparms; parm; parm = TREE_CHAIN (parm))
+ if (TREE_TYPE (parm) != error_mark_node
+ && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
{
- tree tail, found = NULL;
-
- if (TREE_VALUE (parm) == 0)
- {
- error_with_decl (fndecl,
- "parameter name missing from parameter list");
- TREE_PURPOSE (parm) = 0;
- continue;
- }
-
- /* See if any of the parmdecls specifies this parm by name.
- Ignore any enumerator decls. */
- for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
- if (DECL_NAME (tail) == TREE_VALUE (parm)
- && TREE_CODE (tail) == PARM_DECL)
- {
- found = tail;
- break;
- }
+ error ("parameter %q+D has incomplete type", parm);
+ TREE_TYPE (parm) = error_mark_node;
+ }
- /* If declaration already marked, we have a duplicate name.
- Complain, and don't use this decl twice. */
- if (found && DECL_WEAK (found))
- {
- error_with_decl (found, "multiple parameters named `%s'");
- found = 0;
- }
+ if (!pointer_set_contains (seen_args, parm))
+ {
+ error ("declaration for parameter %q+D but no such parameter", parm);
- /* If the declaration says "void", complain and ignore it. */
- if (found && VOID_TYPE_P (TREE_TYPE (found)))
- {
- error_with_decl (found, "parameter `%s' declared void");
- TREE_TYPE (found) = integer_type_node;
- DECL_ARG_TYPE (found) = integer_type_node;
- layout_decl (found, 0);
- }
+ /* Pretend the parameter was not missing.
+ This gets us to a standard state and minimizes
+ further error messages. */
+ parmids = chainon (parmids, tree_cons (parm, 0, 0));
+ }
+ }
- /* Traditionally, a parm declared float is actually a double. */
- if (found && flag_traditional
- && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
- {
- TREE_TYPE (found) = double_type_node;
- DECL_ARG_TYPE (found) = double_type_node;
- layout_decl (found, 0);
- }
+ /* Chain the declarations together in the order of the list of
+ names. Store that chain in the function decl, replacing the
+ list of names. Update the current scope to match. */
+ DECL_ARGUMENTS (fndecl) = 0;
- /* If no declaration found, default to int. */
- if (!found)
- {
- found = build_decl (PARM_DECL, TREE_VALUE (parm),
- integer_type_node);
- DECL_ARG_TYPE (found) = TREE_TYPE (found);
- DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
- DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
- if (flag_isoc99)
- pedwarn_with_decl (found, "type of `%s' defaults to `int'");
- else if (extra_warnings)
- warning_with_decl (found, "type of `%s' defaults to `int'");
- pushdecl (found);
- }
+ for (parm = parmids; parm; parm = TREE_CHAIN (parm))
+ if (TREE_PURPOSE (parm))
+ break;
+ if (parm && TREE_PURPOSE (parm))
+ {
+ last = TREE_PURPOSE (parm);
+ DECL_ARGUMENTS (fndecl) = last;
- TREE_PURPOSE (parm) = found;
+ for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
+ if (TREE_PURPOSE (parm))
+ {
+ TREE_CHAIN (last) = TREE_PURPOSE (parm);
+ last = TREE_PURPOSE (parm);
+ }
+ TREE_CHAIN (last) = 0;
+ }
- /* Mark this decl as "already found". */
- DECL_WEAK (found) = 1;
- }
+ pointer_set_destroy (seen_args);
- /* Put anything which is on the parmdecls chain and which is
- not a PARM_DECL onto the list NONPARMS. (The types of
- non-parm things which might appear on the list include
- enumerators and NULL-named TYPE_DECL nodes.) Complain about
- any actual PARM_DECLs not matched with any names. */
+ /* If there was a previous prototype,
+ set the DECL_ARG_TYPE of each argument according to
+ the type previously specified, and report any mismatches. */
- nonparms = 0;
- for (parm = parmdecls; parm;)
+ if (current_function_prototype_arg_types)
+ {
+ tree type;
+ for (parm = DECL_ARGUMENTS (fndecl),
+ type = current_function_prototype_arg_types;
+ parm || (type && TREE_VALUE (type) != error_mark_node
+ && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
+ parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
{
- tree next = TREE_CHAIN (parm);
- TREE_CHAIN (parm) = 0;
-
- if (TREE_CODE (parm) != PARM_DECL)
- nonparms = chainon (nonparms, parm);
- else
+ if (parm == 0 || type == 0
+ || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
{
- /* Complain about args with incomplete types. */
- if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
- {
- error_with_decl (parm, "parameter `%s' has incomplete type");
- TREE_TYPE (parm) = error_mark_node;
- }
-
- if (! DECL_WEAK (parm))
+ if (current_function_prototype_built_in)
+ warning (0, "number of arguments doesn%'t match "
+ "built-in prototype");
+ else
{
- error_with_decl (parm,
- "declaration for parameter `%s' but no such parameter");
- /* Pretend the parameter was not missing.
- This gets us to a standard state and minimizes
- further error messages. */
- specparms
- = chainon (specparms,
- tree_cons (parm, NULL_TREE, NULL_TREE));
+ error ("number of arguments doesn%'t match prototype");
+ error ("%Hprototype declaration",
+ ¤t_function_prototype_locus);
}
+ break;
}
-
- parm = next;
- }
-
- /* Chain the declarations together in the order of the list of
- names. Store that chain in the function decl, replacing the
- list of names. */
- parm = specparms;
- DECL_ARGUMENTS (fndecl) = 0;
- {
- tree last;
- for (last = 0; parm; parm = TREE_CHAIN (parm))
- if (TREE_PURPOSE (parm))
- {
- if (last == 0)
- DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
- else
- TREE_CHAIN (last) = TREE_PURPOSE (parm);
- last = TREE_PURPOSE (parm);
- TREE_CHAIN (last) = 0;
- }
- }
-
- /* If there was a previous prototype,
- set the DECL_ARG_TYPE of each argument according to
- the type previously specified, and report any mismatches. */
-
- if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
- {
- tree type;
- for (parm = DECL_ARGUMENTS (fndecl),
- type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
- parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
- != void_type_node));
- parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
+ /* Type for passing arg must be consistent with that
+ declared for the arg. ISO C says we take the unqualified
+ type for parameters declared with qualified type. */
+ if (TREE_TYPE (parm) != error_mark_node
+ && TREE_TYPE (type) != error_mark_node
+ && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
+ TYPE_MAIN_VARIANT (TREE_VALUE (type))))
{
- if (parm == 0 || type == 0
- || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
- {
- error ("number of arguments doesn't match prototype");
- error_with_file_and_line (current_function_prototype_file,
- current_function_prototype_line,
- "prototype declaration");
- break;
- }
- /* Type for passing arg must be consistent with that
- declared for the arg. ISO C says we take the unqualified
- type for parameters declared with qualified type. */
- if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
- TYPE_MAIN_VARIANT (TREE_VALUE (type))))
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
+ == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
{
- if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
- == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
+ /* Adjust argument to match prototype. E.g. a previous
+ `int foo(float);' prototype causes
+ `int foo(x) float x; {...}' to be treated like
+ `int foo(float x) {...}'. This is particularly
+ useful for argument types like uid_t. */
+ DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
+
+ if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
+ && INTEGRAL_TYPE_P (TREE_TYPE (parm))
+ && TYPE_PRECISION (TREE_TYPE (parm))
+ < TYPE_PRECISION (integer_type_node))
+ DECL_ARG_TYPE (parm) = integer_type_node;
+
+ /* ??? Is it possible to get here with a
+ built-in prototype or will it always have
+ been diagnosed as conflicting with an
+ old-style definition and discarded? */
+ if (current_function_prototype_built_in)
+ warning (OPT_pedantic, "promoted argument %qD "
+ "doesn%'t match built-in prototype", parm);
+ else
{
- /* Adjust argument to match prototype. E.g. a previous
- `int foo(float);' prototype causes
- `int foo(x) float x; {...}' to be treated like
- `int foo(float x) {...}'. This is particularly
- useful for argument types like uid_t. */
- DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
-
- if (PROMOTE_PROTOTYPES
- && INTEGRAL_TYPE_P (TREE_TYPE (parm))
- && TYPE_PRECISION (TREE_TYPE (parm))
- < TYPE_PRECISION (integer_type_node))
- DECL_ARG_TYPE (parm) = integer_type_node;
-
- if (pedantic)
- {
- pedwarn ("promoted argument `%s' doesn't match prototype",
- IDENTIFIER_POINTER (DECL_NAME (parm)));
- warning_with_file_and_line
- (current_function_prototype_file,
- current_function_prototype_line,
- "prototype declaration");
- }
+ pedwarn (input_location, OPT_pedantic, "promoted argument %qD "
+ "doesn%'t match prototype", parm);
+ pedwarn (current_function_prototype_locus, OPT_pedantic,
+ "prototype declaration");
}
- /* If -traditional, allow `int' argument to match
- `unsigned' prototype. */
- else if (! (flag_traditional
- && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
- && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
+ }
+ else
+ {
+ if (current_function_prototype_built_in)
+ warning (0, "argument %qD doesn%'t match "
+ "built-in prototype", parm);
+ else
{
- error ("argument `%s' doesn't match prototype",
- IDENTIFIER_POINTER (DECL_NAME (parm)));
- error_with_file_and_line (current_function_prototype_file,
- current_function_prototype_line,
- "prototype declaration");
+ error ("argument %qD doesn%'t match prototype", parm);
+ error ("%Hprototype declaration",
+ ¤t_function_prototype_locus);
}
}
}
- TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
}
+ TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
+ }
- /* Otherwise, create a prototype that would match. */
+ /* Otherwise, create a prototype that would match. */
- else
- {
- tree actual = 0, last = 0, type;
+ else
+ {
+ tree actual = 0, last = 0, type;
- for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
- {
- type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
- if (last)
- TREE_CHAIN (last) = type;
- else
- actual = type;
- last = type;
- }
- type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
+ for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
+ {
+ type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
if (last)
TREE_CHAIN (last) = type;
else
actual = type;
+ last = type;
+ }
+ type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
+ if (last)
+ TREE_CHAIN (last) = type;
+ else
+ actual = type;
- /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
- of the type of this function, but we need to avoid having this
- affect the types of other similarly-typed functions, so we must
- first force the generation of an identical (but separate) type
- node for the relevant function type. The new node we create
- will be a variant of the main variant of the original function
- type. */
+ /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
+ of the type of this function, but we need to avoid having this
+ affect the types of other similarly-typed functions, so we must
+ first force the generation of an identical (but separate) type
+ node for the relevant function type. The new node we create
+ will be a variant of the main variant of the original function
+ type. */
- TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
+ TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
- TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
- }
+ TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
+ }
+}
- /* Now store the final chain of decls for the arguments
- as the decl-chain of the current lexical scope.
- Put the enumerators in as well, at the front so that
- DECL_ARGUMENTS is not modified. */
+/* Store parameter declarations passed in ARG_INFO into the current
+ function declaration. */
- storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
- }
+void
+store_parm_decls_from (struct c_arg_info *arg_info)
+{
+ current_function_arg_info = arg_info;
+ store_parm_decls ();
+}
+
+/* Store the parameter declarations into the current function declaration.
+ This is called after parsing the parameter declarations, before
+ digesting the body of the function.
+
+ For an old-style definition, construct a prototype out of the old-style
+ parameter declarations and inject it into the function's type. */
+
+void
+store_parm_decls (void)
+{
+ tree fndecl = current_function_decl;
+ bool proto;
- /* Make sure the binding level for the top of the function body
- gets a BLOCK if there are any in the function.
- Otherwise, the dbx output is wrong. */
+ /* The argument information block for FNDECL. */
+ struct c_arg_info *arg_info = current_function_arg_info;
+ current_function_arg_info = 0;
- keep_next_if_subblocks = 1;
+ /* True if this definition is written with a prototype. Note:
+ despite C99 6.7.5.3p14, we can *not* treat an empty argument
+ list in a function definition as equivalent to (void) -- an
+ empty argument list specifies the function has no parameters,
+ but only (void) sets up a prototype for future calls. */
+ proto = arg_info->types != 0;
- /* ??? This might be an improvement,
- but needs to be thought about some more. */
-#if 0
- keep_next_level_flag = 1;
-#endif
+ if (proto)
+ store_parm_decls_newstyle (fndecl, arg_info);
+ else
+ store_parm_decls_oldstyle (fndecl, arg_info);
+
+ /* The next call to push_scope will be a function body. */
+
+ next_is_function_body = true;
/* Write a record describing this function definition to the prototypes
file (if requested). */
- gen_aux_info_record (fndecl, 1, 0, prototype);
+ gen_aux_info_record (fndecl, 1, 0, proto);
/* Initialize the RTL code for the function. */
- init_function_start (fndecl, input_filename, lineno);
+ allocate_struct_function (fndecl, false);
/* Begin the statement tree for this function. */
- begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
-
- /* If this is a nested function, save away the sizes of any
- variable-size types so that we can expand them when generating
- RTL. */
- if (context)
- {
- tree t;
-
- DECL_LANG_SPECIFIC (fndecl)->pending_sizes
- = nreverse (get_pending_sizes ());
- for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
- t;
- t = TREE_CHAIN (t))
- SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
- }
-
- /* This function is being processed in whole-function mode. */
- cfun->x_whole_function_mode_p = 1;
+ DECL_SAVED_TREE (fndecl) = push_stmt_list ();
+
+ /* ??? Insert the contents of the pending sizes list into the function
+ to be evaluated. The only reason left to have this is
+ void foo(int n, int array[n++])
+ because we throw away the array type in favor of a pointer type, and
+ thus won't naturally see the SAVE_EXPR containing the increment. All
+ other pending sizes would be handled by gimplify_parameters. */
+ {
+ tree t;
+ for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
+ add_stmt (TREE_VALUE (t));
+ }
/* Even though we're inside a function body, we still don't want to
call expand_expr to calculate the size of a variable-sized array.
We haven't necessarily assigned RTL to all variables yet, so it's
not safe to try to expand expressions involving them. */
- immediate_size_expand = 0;
- cfun->x_dont_save_pending_sizes_p = 1;
-
- warn_shadow = saved_warn_shadow;
+ cfun->dont_save_pending_sizes_p = 1;
}
\f
-/* Finish up a function declaration and compile that function
- all the way to assembler language output. The free the storage
- for the function definition.
+/* Emit diagnostics that require gimple input for detection. Operate on
+ FNDECL and all its nested functions. */
- This is called after parsing the body of the function definition.
+static void
+c_gimple_diagnostics_recursively (tree fndecl)
+{
+ struct cgraph_node *cgn;
+ gimple_seq body = gimple_body (fndecl);
- NESTED is nonzero if the function being finished is nested in another.
- CAN_DEFER_P is nonzero if the function may be deferred. */
+ /* Handle attribute((warn_unused_result)). Relies on gimple input. */
+ c_warn_unused_result (body);
+
+ /* Notice when OpenMP structured block constraints are violated. */
+ if (flag_openmp)
+ diagnose_omp_structured_block_errors (fndecl);
+
+ /* Finalize all nested functions now. */
+ cgn = cgraph_node (fndecl);
+ for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
+ c_gimple_diagnostics_recursively (cgn->decl);
+}
+
+/* Finish up a function declaration and compile that function
+ all the way to assembler language output. The free the storage
+ for the function definition.
+
+ This is called after parsing the body of the function definition. */
void
-finish_function (nested, can_defer_p)
- int nested;
- int can_defer_p;
+finish_function (void)
{
tree fndecl = current_function_decl;
-#if 0
- /* This caused &foo to be of type ptr-to-const-function which then
- got a warning when stored in a ptr-to-function variable. */
- TREE_READONLY (fndecl) = 1;
-#endif
+ label_context_stack_se = label_context_stack_se->next;
+ label_context_stack_vm = label_context_stack_vm->next;
+
+ if (TREE_CODE (fndecl) == FUNCTION_DECL
+ && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
+ {
+ tree args = DECL_ARGUMENTS (fndecl);
+ for (; args; args = TREE_CHAIN (args))
+ {
+ tree type = TREE_TYPE (args);
+ if (INTEGRAL_TYPE_P (type)
+ && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
+ DECL_ARG_TYPE (args) = integer_type_node;
+ }
+ }
- poplevel (1, 0, 1);
- BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
+ if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
+ BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
/* Must mark the RESULT_DECL as being in this function. */
- DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
+ if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
+ DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
- /* Obey `register' declarations if `setjmp' is called in this fn. */
- if (flag_traditional && current_function_calls_setjmp)
+ if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
+ && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
+ == integer_type_node && flag_isoc99)
{
- setjmp_protect (DECL_INITIAL (fndecl));
- setjmp_protect_args ();
+ tree stmt = c_finish_return (integer_zero_node);
+ /* Hack. We don't want the middle-end to warn that this return
+ is unreachable, so we mark its location as special. Using
+ UNKNOWN_LOCATION has the problem that it gets clobbered in
+ annotate_one_with_locus. A cleaner solution might be to
+ ensure ! should_carry_locus_p (stmt), but that needs a flag.
+ */
+ SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
}
- if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
- {
- if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
- != integer_type_node)
- {
- /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
- If warn_main is -1 (-Wno-main) we don't want to be warned. */
- if (! warn_main)
- pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
- }
- else
- {
-#ifdef DEFAULT_MAIN_RETURN
- /* Make it so that `main' always returns success by default. */
- DEFAULT_MAIN_RETURN;
-#else
- if (flag_isoc99)
- c_expand_return (integer_zero_node);
-#endif
- }
- }
-
- finish_fname_decls ();
-
/* Tie off the statement tree for this function. */
- finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
+ DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
+
+ finish_fname_decls ();
/* Complain if there's just no return statement. */
if (warn_return_type
&& TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
&& !current_function_returns_value && !current_function_returns_null
- /* Don't complain if we abort. */
+ /* Don't complain if we are no-return. */
&& !current_function_returns_abnormally
+ /* Don't complain if we are declared noreturn. */
+ && !TREE_THIS_VOLATILE (fndecl)
/* Don't warn for main(). */
&& !MAIN_NAME_P (DECL_NAME (fndecl))
/* Or if they didn't actually specify a return type. */
&& !C_FUNCTION_IMPLICIT_INT (fndecl)
- /* Normally, with -Wreturn-type, flow will complain. Unless we're an
- inline function, as we might never be compiled separately. */
- && DECL_INLINE (fndecl))
- warning ("no return statement in function returning non-void");
-
- /* Clear out memory we no longer need. */
- free_after_parsing (cfun);
- /* Since we never call rest_of_compilation, we never clear
- CFUN. Do so explicitly. */
- free_after_compilation (cfun);
- cfun = NULL;
-
- if (! nested)
- {
- /* Generate RTL for the body of this function. */
- c_expand_body (fndecl, nested, can_defer_p);
-
- /* Let the error reporting routines know that we're outside a
- function. For a nested function, this value is used in
- pop_c_function_context and then reset via pop_function_context. */
- current_function_decl = NULL;
- }
-}
-
-/* Generate the RTL for a deferred function FNDECL. */
-
-void
-c_expand_deferred_function (fndecl)
- tree fndecl;
-{
- /* DECL_INLINE or DECL_RESULT might got cleared after the inline
- function was deferred, e.g. in duplicate_decls. */
- if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
- {
- c_expand_body (fndecl, 0, 0);
- current_function_decl = NULL;
- }
-}
-
-/* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
- then we are already in the process of generating RTL for another
- function. If can_defer_p is zero, we won't attempt to defer the
- generation of RTL. */
-
-static void
-c_expand_body (fndecl, nested_p, can_defer_p)
- tree fndecl;
- int nested_p, can_defer_p;
-{
- int uninlinable = 1;
-
- /* There's no reason to do any of the work here if we're only doing
- semantic analysis; this code just generates RTL. */
- if (flag_syntax_only)
- return;
-
- if (flag_inline_trees)
- {
- /* First, cache whether the current function is inlinable. Some
- predicates depend on cfun and current_function_decl to
- function completely. */
- timevar_push (TV_INTEGRATION);
- uninlinable = ! tree_inlinable_function_p (fndecl);
-
- if (! uninlinable && can_defer_p
- /* Save function tree for inlining. Should return 0 if the
- language does not support function deferring or the
- function could not be deferred. */
- && defer_fn (fndecl))
- {
- /* Let the back-end know that this function exists. */
- (*debug_hooks->deferred_inline_function) (fndecl);
- timevar_pop (TV_INTEGRATION);
- return;
- }
-
- /* Then, inline any functions called in it. */
- optimize_inline_calls (fndecl);
- timevar_pop (TV_INTEGRATION);
- }
-
- timevar_push (TV_EXPAND);
-
- if (nested_p)
- {
- /* Make sure that we will evaluate variable-sized types involved
- in our function's type. */
- expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
- /* Squirrel away our current state. */
- push_function_context ();
- }
-
- /* Initialize the RTL code for the function. */
- current_function_decl = fndecl;
- input_filename = DECL_SOURCE_FILE (fndecl);
- init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
-
- /* This function is being processed in whole-function mode. */
- cfun->x_whole_function_mode_p = 1;
-
- /* Even though we're inside a function body, we still don't want to
- call expand_expr to calculate the size of a variable-sized array.
- We haven't necessarily assigned RTL to all variables yet, so it's
- not safe to try to expand expressions involving them. */
- immediate_size_expand = 0;
- cfun->x_dont_save_pending_sizes_p = 1;
-
- /* If this is a varargs function, inform function.c. */
- if (c_function_varargs)
- mark_varargs ();
-
- /* Set up parameters and prepare for return, for the function. */
- expand_function_start (fndecl, 0);
-
- /* If this function is `main', emit a call to `__main'
- to run global initializers, etc. */
- if (DECL_NAME (fndecl)
- && MAIN_NAME_P (DECL_NAME (fndecl))
- && DECL_CONTEXT (fndecl) == NULL_TREE)
- expand_main_function ();
-
- /* Generate the RTL for this function. */
- expand_stmt (DECL_SAVED_TREE (fndecl));
- if (uninlinable)
+ /* Normally, with -Wreturn-type, flow will complain, but we might
+ optimize out static functions. */
+ && !TREE_PUBLIC (fndecl))
{
- /* Allow the body of the function to be garbage collected. */
- DECL_SAVED_TREE (fndecl) = NULL_TREE;
+ warning (OPT_Wreturn_type,
+ "no return statement in function returning non-void");
+ TREE_NO_WARNING (fndecl) = 1;
}
- /* We hard-wired immediate_size_expand to zero above.
- expand_function_end will decrement this variable. So, we set the
- variable to one here, so that after the decrement it will remain
- zero. */
- immediate_size_expand = 1;
-
- /* Allow language dialects to perform special processing. */
- if (lang_expand_function_end)
- (*lang_expand_function_end) ();
-
- /* Generate rtl for function exit. */
- expand_function_end (input_filename, lineno, 0);
+ /* Store the end of the function, so that we get good line number
+ info for the epilogue. */
+ cfun->function_end_locus = input_location;
- /* If this is a nested function, protect the local variables in the stack
- above us from being collected while we're compiling this function. */
- if (nested_p)
- ggc_push_context ();
+ /* Finalize the ELF visibility for the function. */
+ c_determine_visibility (fndecl);
- /* Run the optimizers and output the assembler code for this function. */
- rest_of_compilation (fndecl);
+ /* For GNU C extern inline functions disregard inline limits. */
+ if (DECL_EXTERNAL (fndecl)
+ && DECL_DECLARED_INLINE_P (fndecl))
+ DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
- /* Undo the GC context switch. */
- if (nested_p)
- ggc_pop_context ();
+ /* Genericize before inlining. Delay genericizing nested functions
+ until their parent function is genericized. Since finalizing
+ requires GENERIC, delay that as well. */
- /* With just -W, complain only if function returns both with
- and without a value. */
- if (extra_warnings
- && current_function_returns_value
- && current_function_returns_null)
- warning ("this function may return with or without a value");
-
- /* If requested, warn about function definitions where the function will
- return a value (usually of some struct or union type) which itself will
- take up a lot of stack space. */
-
- if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
+ if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
+ && !undef_nested_function)
{
- tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
-
- if (ret_type && TYPE_SIZE_UNIT (ret_type)
- && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
- && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
- larger_than_size))
+ if (!decl_function_context (fndecl))
{
- unsigned int size_as_int
- = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
+ c_genericize (fndecl);
+ c_gimple_diagnostics_recursively (fndecl);
- if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
- warning_with_decl (fndecl,
- "size of return value of `%s' is %u bytes",
- size_as_int);
- else
- warning_with_decl (fndecl,
- "size of return value of `%s' is larger than %d bytes",
- larger_than_size);
- }
- }
-
- if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
- && ! flag_inline_trees)
- {
- /* Stop pointing to the local nodes about to be freed.
- But DECL_INITIAL must remain nonzero so we know this
- was an actual function definition.
- For a nested function, this is done in pop_c_function_context.
- If rest_of_compilation set this to 0, leave it 0. */
- if (DECL_INITIAL (fndecl) != 0)
- DECL_INITIAL (fndecl) = error_mark_node;
-
- DECL_ARGUMENTS (fndecl) = 0;
- }
+ /* ??? Objc emits functions after finalizing the compilation unit.
+ This should be cleaned up later and this conditional removed. */
+ if (cgraph_global_info_ready)
+ {
+ cgraph_add_new_function (fndecl, false);
+ return;
+ }
- if (DECL_STATIC_CONSTRUCTOR (fndecl))
- {
- if (targetm.have_ctors_dtors)
- (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
- DEFAULT_INIT_PRIORITY);
+ cgraph_finalize_function (fndecl, false);
+ }
else
- static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
+ {
+ /* Register this function with cgraph just far enough to get it
+ added to our parent's nested function list. Handy, since the
+ C front end doesn't have such a list. */
+ (void) cgraph_node (fndecl);
+ }
}
- if (DECL_STATIC_DESTRUCTOR (fndecl))
- {
- if (targetm.have_ctors_dtors)
- (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
- DEFAULT_INIT_PRIORITY);
- else
- static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
- }
+ if (!decl_function_context (fndecl))
+ undef_nested_function = false;
- if (nested_p)
- /* Return to the enclosing function. */
- pop_function_context ();
- timevar_pop (TV_EXPAND);
+ /* We're leaving the context of this function, so zap cfun.
+ It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
+ tree_rest_of_compilation. */
+ set_cfun (NULL);
+ current_function_decl = NULL;
}
\f
/* Check the declarations given in a for-loop for satisfying the C99
- constraints. */
-void
-check_for_loop_decls ()
+ constraints. If exactly one such decl is found, return it. */
+
+tree
+check_for_loop_decls (void)
{
- tree t;
+ struct c_binding *b;
+ tree one_decl = NULL_TREE;
+ int n_decls = 0;
if (!flag_isoc99)
{
+ static bool hint = true;
/* If we get here, declarations have been used in a for loop without
the C99 for loop scope. This doesn't make much sense, so don't
allow it. */
- error ("`for' loop initial declaration used outside C99 mode");
- return;
+ error ("%<for%> loop initial declarations are only allowed in C99 mode");
+ if (hint)
+ {
+ inform (input_location,
+ "use option -std=c99 or -std=gnu99 to compile your code");
+ hint = false;
+ }
+ return NULL_TREE;
}
/* C99 subclause 6.8.5 paragraph 3:
interpretation, to avoid creating an extension which later causes
problems. */
- for (t = gettags (); t; t = TREE_CHAIN (t))
+ for (b = current_scope->bindings; b; b = b->prev)
{
- if (TREE_PURPOSE (t) != 0)
- {
- enum tree_code code = TREE_CODE (TREE_VALUE (t));
-
- if (code == RECORD_TYPE)
- error ("`struct %s' declared in `for' loop initial declaration",
- IDENTIFIER_POINTER (TREE_PURPOSE (t)));
- else if (code == UNION_TYPE)
- error ("`union %s' declared in `for' loop initial declaration",
- IDENTIFIER_POINTER (TREE_PURPOSE (t)));
- else
- error ("`enum %s' declared in `for' loop initial declaration",
- IDENTIFIER_POINTER (TREE_PURPOSE (t)));
- }
- }
-
- for (t = getdecls (); t; t = TREE_CHAIN (t))
- {
- if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
- error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
- else if (TREE_STATIC (t))
- error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
- else if (DECL_EXTERNAL (t))
- error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
+ tree id = b->id;
+ tree decl = b->decl;
+
+ if (!id)
+ continue;
+
+ switch (TREE_CODE (decl))
+ {
+ case VAR_DECL:
+ if (TREE_STATIC (decl))
+ error ("declaration of static variable %q+D in %<for%> loop "
+ "initial declaration", decl);
+ else if (DECL_EXTERNAL (decl))
+ error ("declaration of %<extern%> variable %q+D in %<for%> loop "
+ "initial declaration", decl);
+ break;
+
+ case RECORD_TYPE:
+ error ("%<struct %E%> declared in %<for%> loop initial declaration",
+ id);
+ break;
+ case UNION_TYPE:
+ error ("%<union %E%> declared in %<for%> loop initial declaration",
+ id);
+ break;
+ case ENUMERAL_TYPE:
+ error ("%<enum %E%> declared in %<for%> loop initial declaration",
+ id);
+ break;
+ default:
+ error ("declaration of non-variable %q+D in %<for%> loop "
+ "initial declaration", decl);
+ }
+
+ n_decls++;
+ one_decl = decl;
}
+
+ return n_decls == 1 ? one_decl : NULL_TREE;
}
\f
-/* Save and restore the variables in this file and elsewhere
- that keep track of the progress of compilation of the current function.
- Used for nested functions. */
-
-struct c_language_function
-{
- struct language_function base;
- tree named_labels;
- tree shadowed_labels;
- int returns_value;
- int returns_null;
- int returns_abnormally;
- int warn_about_return_type;
- int extern_inline;
- struct binding_level *binding_level;
-};
-
/* Save and reinitialize the variables
used during compilation of a C function. */
void
-push_c_function_context (f)
- struct function *f;
+c_push_function_context (void)
{
- struct c_language_function *p;
- p = ((struct c_language_function *)
- xmalloc (sizeof (struct c_language_function)));
- f->language = (struct language_function *) p;
+ struct language_function *p;
+ p = GGC_NEW (struct language_function);
+ cfun->language = p;
p->base.x_stmt_tree = c_stmt_tree;
- p->base.x_scope_stmt_stack = c_scope_stmt_stack;
- p->named_labels = named_labels;
- p->shadowed_labels = shadowed_labels;
+ p->x_break_label = c_break_label;
+ p->x_cont_label = c_cont_label;
+ p->x_switch_stack = c_switch_stack;
+ p->arg_info = current_function_arg_info;
p->returns_value = current_function_returns_value;
p->returns_null = current_function_returns_null;
p->returns_abnormally = current_function_returns_abnormally;
p->warn_about_return_type = warn_about_return_type;
- p->extern_inline = current_extern_inline;
- p->binding_level = current_binding_level;
+
+ push_function_context ();
}
/* Restore the variables used during compilation of a C function. */
void
-pop_c_function_context (f)
- struct function *f;
+c_pop_function_context (void)
{
- struct c_language_function *p
- = (struct c_language_function *) f->language;
- tree link;
+ struct language_function *p;
- /* Bring back all the labels that were shadowed. */
- for (link = shadowed_labels; link; link = TREE_CHAIN (link))
- if (DECL_NAME (TREE_VALUE (link)) != 0)
- IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
- = TREE_VALUE (link);
+ pop_function_context ();
+ p = cfun->language;
+ cfun->language = NULL;
- if (DECL_SAVED_INSNS (current_function_decl) == 0
+ if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
&& DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
{
/* Stop pointing to the local nodes about to be freed. */
}
c_stmt_tree = p->base.x_stmt_tree;
- c_scope_stmt_stack = p->base.x_scope_stmt_stack;
- named_labels = p->named_labels;
- shadowed_labels = p->shadowed_labels;
+ c_break_label = p->x_break_label;
+ c_cont_label = p->x_cont_label;
+ c_switch_stack = p->x_switch_stack;
+ current_function_arg_info = p->arg_info;
current_function_returns_value = p->returns_value;
current_function_returns_null = p->returns_null;
current_function_returns_abnormally = p->returns_abnormally;
warn_about_return_type = p->warn_about_return_type;
- current_extern_inline = p->extern_inline;
- current_binding_level = p->binding_level;
-
- free (p);
- f->language = 0;
}
-/* Mark the language specific parts of F for GC. */
+/* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
void
-mark_c_function_context (f)
- struct function *f;
+c_dup_lang_specific_decl (tree decl)
{
- struct c_language_function *p
- = (struct c_language_function *) f->language;
+ struct lang_decl *ld;
- if (p == 0)
+ if (!DECL_LANG_SPECIFIC (decl))
return;
- mark_c_language_function (&p->base);
- ggc_mark_tree (p->shadowed_labels);
- ggc_mark_tree (p->named_labels);
- mark_binding_level (&p->binding_level);
+ ld = GGC_NEW (struct lang_decl);
+ memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
+ DECL_LANG_SPECIFIC (decl) = ld;
}
-/* Copy the DECL_LANG_SPECIFIC data associated with NODE. */
+/* The functions below are required for functionality of doing
+ function at once processing in the C front end. Currently these
+ functions are not called from anywhere in the C front end, but as
+ these changes continue, that will change. */
-void
-copy_lang_decl (decl)
- tree decl;
+/* Returns the stmt_tree (if any) to which statements are currently
+ being added. If there is no active statement-tree, NULL is
+ returned. */
+
+stmt_tree
+current_stmt_tree (void)
{
- struct lang_decl *ld;
+ return &c_stmt_tree;
+}
- if (!DECL_LANG_SPECIFIC (decl))
- return;
+/* Return the global value of T as a symbol. */
- ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
- memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
- sizeof (struct lang_decl));
- DECL_LANG_SPECIFIC (decl) = ld;
+tree
+identifier_global_value (tree t)
+{
+ struct c_binding *b;
+
+ for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
+ if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
+ return b->decl;
+
+ return 0;
}
-/* Mark the language specific bits in T for GC. */
+/* Record a builtin type for C. If NAME is non-NULL, it is the name used;
+ otherwise the name is found in ridpointers from RID_INDEX. */
void
-lang_mark_tree (t)
- tree t;
+record_builtin_type (enum rid rid_index, const char *name, tree type)
{
- if (TREE_CODE (t) == IDENTIFIER_NODE)
- {
- struct lang_identifier *i = (struct lang_identifier *) t;
- ggc_mark_tree (i->global_value);
- ggc_mark_tree (i->local_value);
- ggc_mark_tree (i->label_value);
- ggc_mark_tree (i->implicit_decl);
- ggc_mark_tree (i->error_locus);
- ggc_mark_tree (i->limbo_value);
- }
- else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
- ggc_mark (TYPE_LANG_SPECIFIC (t));
- else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
- {
- ggc_mark (DECL_LANG_SPECIFIC (t));
- c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
- ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
- }
+ tree id, decl;
+ if (name == 0)
+ id = ridpointers[(int) rid_index];
+ else
+ id = get_identifier (name);
+ decl = build_decl (TYPE_DECL, id, type);
+ pushdecl (decl);
+ if (debug_hooks->type_decl)
+ debug_hooks->type_decl (decl, false);
}
-/* The functions below are required for functionality of doing
- function at once processing in the C front end. Currently these
- functions are not called from anywhere in the C front end, but as
- these changes continue, that will change. */
+/* Build the void_list_node (void_type_node having been created). */
+tree
+build_void_list_node (void)
+{
+ tree t = build_tree_list (NULL_TREE, void_type_node);
+ return t;
+}
-/* Returns non-zero if the current statement is a full expression,
- i.e. temporaries created during that statement should be destroyed
- at the end of the statement. */
+/* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
-int
-stmts_are_full_exprs_p ()
+struct c_parm *
+build_c_parm (struct c_declspecs *specs, tree attrs,
+ struct c_declarator *declarator)
{
- return 0;
+ struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
+ ret->specs = specs;
+ ret->attrs = attrs;
+ ret->declarator = declarator;
+ return ret;
}
-/* Returns the stmt_tree (if any) to which statements are currently
- being added. If there is no active statement-tree, NULL is
- returned. */
+/* Return a declarator with nested attributes. TARGET is the inner
+ declarator to which these attributes apply. ATTRS are the
+ attributes. */
-stmt_tree
-current_stmt_tree ()
+struct c_declarator *
+build_attrs_declarator (tree attrs, struct c_declarator *target)
{
- return &c_stmt_tree;
+ struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
+ ret->kind = cdk_attrs;
+ ret->declarator = target;
+ ret->u.attrs = attrs;
+ return ret;
}
-/* Returns the stack of SCOPE_STMTs for the current function. */
+/* Return a declarator for a function with arguments specified by ARGS
+ and return type specified by TARGET. */
-tree *
-current_scope_stmt_stack ()
+struct c_declarator *
+build_function_declarator (struct c_arg_info *args,
+ struct c_declarator *target)
{
- return &c_scope_stmt_stack;
+ struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
+ ret->kind = cdk_function;
+ ret->declarator = target;
+ ret->u.arg_info = args;
+ return ret;
}
-/* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
- C. */
+/* Return a declarator for the identifier IDENT (which may be
+ NULL_TREE for an abstract declarator). */
-int
-anon_aggr_type_p (node)
- tree node ATTRIBUTE_UNUSED;
+struct c_declarator *
+build_id_declarator (tree ident)
{
- return 0;
+ struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
+ ret->kind = cdk_id;
+ ret->declarator = 0;
+ ret->u.id = ident;
+ /* Default value - may get reset to a more precise location. */
+ ret->id_loc = input_location;
+ return ret;
}
-/* Dummy function in place of callback used by C++. */
+/* Return something to represent absolute declarators containing a *.
+ TARGET is the absolute declarator that the * contains.
+ TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
+ to apply to the pointer type. */
-void
-extract_interface_info ()
+struct c_declarator *
+make_pointer_declarator (struct c_declspecs *type_quals_attrs,
+ struct c_declarator *target)
{
+ tree attrs;
+ int quals = 0;
+ struct c_declarator *itarget = target;
+ struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
+ if (type_quals_attrs)
+ {
+ attrs = type_quals_attrs->attrs;
+ quals = quals_from_declspecs (type_quals_attrs);
+ if (attrs != NULL_TREE)
+ itarget = build_attrs_declarator (attrs, target);
+ }
+ ret->kind = cdk_pointer;
+ ret->declarator = itarget;
+ ret->u.pointer_quals = quals;
+ return ret;
}
-/* Return a new COMPOUND_STMT, after adding it to the current
- statement tree. */
+/* Return a pointer to a structure for an empty list of declaration
+ specifiers. */
-tree
-c_begin_compound_stmt ()
+struct c_declspecs *
+build_null_declspecs (void)
{
- tree stmt;
+ struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
+ ret->type = 0;
+ ret->decl_attr = 0;
+ ret->attrs = 0;
+ ret->typespec_word = cts_none;
+ ret->storage_class = csc_none;
+ ret->declspecs_seen_p = false;
+ ret->type_seen_p = false;
+ ret->non_sc_seen_p = false;
+ ret->typedef_p = false;
+ ret->tag_defined_p = false;
+ ret->explicit_signed_p = false;
+ ret->deprecated_p = false;
+ ret->default_int_p = false;
+ ret->long_p = false;
+ ret->long_long_p = false;
+ ret->short_p = false;
+ ret->signed_p = false;
+ ret->unsigned_p = false;
+ ret->complex_p = false;
+ ret->inline_p = false;
+ ret->thread_p = false;
+ ret->const_p = false;
+ ret->volatile_p = false;
+ ret->restrict_p = false;
+ ret->saturating_p = false;
+ return ret;
+}
- /* Create the COMPOUND_STMT. */
- stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
+/* Add the type qualifier QUAL to the declaration specifiers SPECS,
+ returning SPECS. */
- return stmt;
+struct c_declspecs *
+declspecs_add_qual (struct c_declspecs *specs, tree qual)
+{
+ enum rid i;
+ bool dupe = false;
+ specs->non_sc_seen_p = true;
+ specs->declspecs_seen_p = true;
+ gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
+ && C_IS_RESERVED_WORD (qual));
+ i = C_RID_CODE (qual);
+ switch (i)
+ {
+ case RID_CONST:
+ dupe = specs->const_p;
+ specs->const_p = true;
+ break;
+ case RID_VOLATILE:
+ dupe = specs->volatile_p;
+ specs->volatile_p = true;
+ break;
+ case RID_RESTRICT:
+ dupe = specs->restrict_p;
+ specs->restrict_p = true;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+ if (dupe && !flag_isoc99)
+ pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
+ return specs;
}
-/* Expand T (a DECL_STMT) if it declares an entity not handled by the
- common code. */
+/* Add the type specifier TYPE to the declaration specifiers SPECS,
+ returning SPECS. */
-void
-c_expand_decl_stmt (t)
- tree t;
+struct c_declspecs *
+declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
+{
+ tree type = spec.spec;
+ specs->non_sc_seen_p = true;
+ specs->declspecs_seen_p = true;
+ specs->type_seen_p = true;
+ if (TREE_DEPRECATED (type))
+ specs->deprecated_p = true;
+
+ /* Handle type specifier keywords. */
+ if (TREE_CODE (type) == IDENTIFIER_NODE
+ && C_IS_RESERVED_WORD (type)
+ && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
+ {
+ enum rid i = C_RID_CODE (type);
+ if (specs->type)
+ {
+ error ("two or more data types in declaration specifiers");
+ return specs;
+ }
+ if ((int) i <= (int) RID_LAST_MODIFIER)
+ {
+ /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
+ bool dupe = false;
+ switch (i)
+ {
+ case RID_LONG:
+ if (specs->long_long_p)
+ {
+ error ("%<long long long%> is too long for GCC");
+ break;
+ }
+ if (specs->long_p)
+ {
+ if (specs->typespec_word == cts_double)
+ {
+ error ("both %<long long%> and %<double%> in "
+ "declaration specifiers");
+ break;
+ }
+ if (pedantic && !flag_isoc99 && !in_system_header)
+ pedwarn (input_location, OPT_Wlong_long, "ISO C90 does not support %<long long%>");
+ specs->long_long_p = 1;
+ break;
+ }
+ if (specs->short_p)
+ error ("both %<long%> and %<short%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_void)
+ error ("both %<long%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<long%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_char)
+ error ("both %<long%> and %<char%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<long%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat32)
+ error ("both %<long%> and %<_Decimal32%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat64)
+ error ("both %<long%> and %<_Decimal64%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat128)
+ error ("both %<long%> and %<_Decimal128%> in "
+ "declaration specifiers");
+ else
+ specs->long_p = true;
+ break;
+ case RID_SHORT:
+ dupe = specs->short_p;
+ if (specs->long_p)
+ error ("both %<long%> and %<short%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_void)
+ error ("both %<short%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<short%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_char)
+ error ("both %<short%> and %<char%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<short%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_double)
+ error ("both %<short%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat32)
+ error ("both %<short%> and %<_Decimal32%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat64)
+ error ("both %<short%> and %<_Decimal64%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat128)
+ error ("both %<short%> and %<_Decimal128%> in "
+ "declaration specifiers");
+ else
+ specs->short_p = true;
+ break;
+ case RID_SIGNED:
+ dupe = specs->signed_p;
+ if (specs->unsigned_p)
+ error ("both %<signed%> and %<unsigned%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_void)
+ error ("both %<signed%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<signed%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<signed%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_double)
+ error ("both %<signed%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat32)
+ error ("both %<signed%> and %<_Decimal32%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat64)
+ error ("both %<signed%> and %<_Decimal64%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat128)
+ error ("both %<signed%> and %<_Decimal128%> in "
+ "declaration specifiers");
+ else
+ specs->signed_p = true;
+ break;
+ case RID_UNSIGNED:
+ dupe = specs->unsigned_p;
+ if (specs->signed_p)
+ error ("both %<signed%> and %<unsigned%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_void)
+ error ("both %<unsigned%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<unsigned%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<unsigned%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_double)
+ error ("both %<unsigned%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat32)
+ error ("both %<unsigned%> and %<_Decimal32%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat64)
+ error ("both %<unsigned%> and %<_Decimal64%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat128)
+ error ("both %<unsigned%> and %<_Decimal128%> in "
+ "declaration specifiers");
+ else
+ specs->unsigned_p = true;
+ break;
+ case RID_COMPLEX:
+ dupe = specs->complex_p;
+ if (!flag_isoc99 && !in_system_header)
+ pedwarn (input_location, OPT_pedantic, "ISO C90 does not support complex types");
+ if (specs->typespec_word == cts_void)
+ error ("both %<complex%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<complex%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat32)
+ error ("both %<complex%> and %<_Decimal32%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat64)
+ error ("both %<complex%> and %<_Decimal64%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat128)
+ error ("both %<complex%> and %<_Decimal128%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_fract)
+ error ("both %<complex%> and %<_Fract%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_accum)
+ error ("both %<complex%> and %<_Accum%> in "
+ "declaration specifiers");
+ else if (specs->saturating_p)
+ error ("both %<complex%> and %<_Sat%> in "
+ "declaration specifiers");
+ else
+ specs->complex_p = true;
+ break;
+ case RID_SAT:
+ dupe = specs->saturating_p;
+ pedwarn (input_location, OPT_pedantic, "ISO C does not support saturating types");
+ if (specs->typespec_word == cts_void)
+ error ("both %<_Sat%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_bool)
+ error ("both %<_Sat%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_char)
+ error ("both %<_Sat%> and %<char%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_int)
+ error ("both %<_Sat%> and %<int%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_float)
+ error ("both %<_Sat%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_double)
+ error ("both %<_Sat%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat32)
+ error ("both %<_Sat%> and %<_Decimal32%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat64)
+ error ("both %<_Sat%> and %<_Decimal64%> in "
+ "declaration specifiers");
+ else if (specs->typespec_word == cts_dfloat128)
+ error ("both %<_Sat%> and %<_Decimal128%> in "
+ "declaration specifiers");
+ else if (specs->complex_p)
+ error ("both %<_Sat%> and %<complex%> in "
+ "declaration specifiers");
+ else
+ specs->saturating_p = true;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+
+ if (dupe)
+ error ("duplicate %qE", type);
+
+ return specs;
+ }
+ else
+ {
+ /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
+ "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
+ if (specs->typespec_word != cts_none)
+ {
+ error ("two or more data types in declaration specifiers");
+ return specs;
+ }
+ switch (i)
+ {
+ case RID_VOID:
+ if (specs->long_p)
+ error ("both %<long%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->complex_p)
+ error ("both %<complex%> and %<void%> in "
+ "declaration specifiers");
+ else if (specs->saturating_p)
+ error ("both %<_Sat%> and %<void%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_void;
+ return specs;
+ case RID_BOOL:
+ if (specs->long_p)
+ error ("both %<long%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->complex_p)
+ error ("both %<complex%> and %<_Bool%> in "
+ "declaration specifiers");
+ else if (specs->saturating_p)
+ error ("both %<_Sat%> and %<_Bool%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_bool;
+ return specs;
+ case RID_CHAR:
+ if (specs->long_p)
+ error ("both %<long%> and %<char%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<char%> in "
+ "declaration specifiers");
+ else if (specs->saturating_p)
+ error ("both %<_Sat%> and %<char%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_char;
+ return specs;
+ case RID_INT:
+ if (specs->saturating_p)
+ error ("both %<_Sat%> and %<int%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_int;
+ return specs;
+ case RID_FLOAT:
+ if (specs->long_p)
+ error ("both %<long%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<float%> in "
+ "declaration specifiers");
+ else if (specs->saturating_p)
+ error ("both %<_Sat%> and %<float%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_float;
+ return specs;
+ case RID_DOUBLE:
+ if (specs->long_long_p)
+ error ("both %<long long%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->short_p)
+ error ("both %<short%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<double%> in "
+ "declaration specifiers");
+ else if (specs->saturating_p)
+ error ("both %<_Sat%> and %<double%> in "
+ "declaration specifiers");
+ else
+ specs->typespec_word = cts_double;
+ return specs;
+ case RID_DFLOAT32:
+ case RID_DFLOAT64:
+ case RID_DFLOAT128:
+ {
+ const char *str;
+ if (i == RID_DFLOAT32)
+ str = "_Decimal32";
+ else if (i == RID_DFLOAT64)
+ str = "_Decimal64";
+ else
+ str = "_Decimal128";
+ if (specs->long_long_p)
+ error ("both %<long long%> and %<%s%> in "
+ "declaration specifiers", str);
+ if (specs->long_p)
+ error ("both %<long%> and %<%s%> in "
+ "declaration specifiers", str);
+ else if (specs->short_p)
+ error ("both %<short%> and %<%s%> in "
+ "declaration specifiers", str);
+ else if (specs->signed_p)
+ error ("both %<signed%> and %<%s%> in "
+ "declaration specifiers", str);
+ else if (specs->unsigned_p)
+ error ("both %<unsigned%> and %<%s%> in "
+ "declaration specifiers", str);
+ else if (specs->complex_p)
+ error ("both %<complex%> and %<%s%> in "
+ "declaration specifiers", str);
+ else if (specs->saturating_p)
+ error ("both %<_Sat%> and %<%s%> in "
+ "declaration specifiers", str);
+ else if (i == RID_DFLOAT32)
+ specs->typespec_word = cts_dfloat32;
+ else if (i == RID_DFLOAT64)
+ specs->typespec_word = cts_dfloat64;
+ else
+ specs->typespec_word = cts_dfloat128;
+ }
+ if (!targetm.decimal_float_supported_p ())
+ error ("decimal floating point not supported for this target");
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C does not support decimal floating point");
+ return specs;
+ case RID_FRACT:
+ case RID_ACCUM:
+ {
+ const char *str;
+ if (i == RID_FRACT)
+ str = "_Fract";
+ else
+ str = "_Accum";
+ if (specs->complex_p)
+ error ("both %<complex%> and %<%s%> in "
+ "declaration specifiers", str);
+ else if (i == RID_FRACT)
+ specs->typespec_word = cts_fract;
+ else
+ specs->typespec_word = cts_accum;
+ }
+ if (!targetm.fixed_point_supported_p ())
+ error ("fixed-point types not supported for this target");
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C does not support fixed-point types");
+ return specs;
+ default:
+ /* ObjC reserved word "id", handled below. */
+ break;
+ }
+ }
+ }
+
+ /* Now we have a typedef (a TYPE_DECL node), an identifier (some
+ form of ObjC type, cases such as "int" and "long" being handled
+ above), a TYPE (struct, union, enum and typeof specifiers) or an
+ ERROR_MARK. In none of these cases may there have previously
+ been any type specifiers. */
+ if (specs->type || specs->typespec_word != cts_none
+ || specs->long_p || specs->short_p || specs->signed_p
+ || specs->unsigned_p || specs->complex_p)
+ error ("two or more data types in declaration specifiers");
+ else if (TREE_CODE (type) == TYPE_DECL)
+ {
+ if (TREE_TYPE (type) == error_mark_node)
+ ; /* Allow the type to default to int to avoid cascading errors. */
+ else
+ {
+ specs->type = TREE_TYPE (type);
+ specs->decl_attr = DECL_ATTRIBUTES (type);
+ specs->typedef_p = true;
+ specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
+ }
+ }
+ else if (TREE_CODE (type) == IDENTIFIER_NODE)
+ {
+ tree t = lookup_name (type);
+ if (!t || TREE_CODE (t) != TYPE_DECL)
+ error ("%qE fails to be a typedef or built in type", type);
+ else if (TREE_TYPE (t) == error_mark_node)
+ ;
+ else
+ specs->type = TREE_TYPE (t);
+ }
+ else if (TREE_CODE (type) != ERROR_MARK)
+ {
+ if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
+ specs->tag_defined_p = true;
+ if (spec.kind == ctsk_typeof)
+ specs->typedef_p = true;
+ specs->type = type;
+ }
+
+ return specs;
+}
+
+/* Add the storage class specifier or function specifier SCSPEC to the
+ declaration specifiers SPECS, returning SPECS. */
+
+struct c_declspecs *
+declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
{
- tree decl = DECL_STMT_DECL (t);
+ enum rid i;
+ enum c_storage_class n = csc_none;
+ bool dupe = false;
+ specs->declspecs_seen_p = true;
+ gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
+ && C_IS_RESERVED_WORD (scspec));
+ i = C_RID_CODE (scspec);
+ if (specs->non_sc_seen_p)
+ warning (OPT_Wold_style_declaration,
+ "%qE is not at beginning of declaration", scspec);
+ switch (i)
+ {
+ case RID_INLINE:
+ /* C99 permits duplicate inline. Although of doubtful utility,
+ it seems simplest to permit it in gnu89 mode as well, as
+ there is also little utility in maintaining this as a
+ difference between gnu89 and C99 inline. */
+ dupe = false;
+ specs->inline_p = true;
+ break;
+ case RID_THREAD:
+ dupe = specs->thread_p;
+ if (specs->storage_class == csc_auto)
+ error ("%<__thread%> used with %<auto%>");
+ else if (specs->storage_class == csc_register)
+ error ("%<__thread%> used with %<register%>");
+ else if (specs->storage_class == csc_typedef)
+ error ("%<__thread%> used with %<typedef%>");
+ else
+ specs->thread_p = true;
+ break;
+ case RID_AUTO:
+ n = csc_auto;
+ break;
+ case RID_EXTERN:
+ n = csc_extern;
+ /* Diagnose "__thread extern". */
+ if (specs->thread_p)
+ error ("%<__thread%> before %<extern%>");
+ break;
+ case RID_REGISTER:
+ n = csc_register;
+ break;
+ case RID_STATIC:
+ n = csc_static;
+ /* Diagnose "__thread static". */
+ if (specs->thread_p)
+ error ("%<__thread%> before %<static%>");
+ break;
+ case RID_TYPEDEF:
+ n = csc_typedef;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+ if (n != csc_none && n == specs->storage_class)
+ dupe = true;
+ if (dupe)
+ error ("duplicate %qE", scspec);
+ if (n != csc_none)
+ {
+ if (specs->storage_class != csc_none && n != specs->storage_class)
+ {
+ error ("multiple storage classes in declaration specifiers");
+ }
+ else
+ {
+ specs->storage_class = n;
+ if (n != csc_extern && n != csc_static && specs->thread_p)
+ {
+ error ("%<__thread%> used with %qE", scspec);
+ specs->thread_p = false;
+ }
+ }
+ }
+ return specs;
+}
- /* Expand nested functions. */
- if (TREE_CODE (decl) == FUNCTION_DECL
- && DECL_CONTEXT (decl) == current_function_decl
- && DECL_SAVED_TREE (decl))
- c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
+/* Add the attributes ATTRS to the declaration specifiers SPECS,
+ returning SPECS. */
+
+struct c_declspecs *
+declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
+{
+ specs->attrs = chainon (attrs, specs->attrs);
+ specs->declspecs_seen_p = true;
+ return specs;
}
-/* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
- the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
+/* Combine "long", "short", "signed", "unsigned" and "_Complex" type
+ specifiers with any other type specifier to determine the resulting
+ type. This is where ISO C checks on complex types are made, since
+ "_Complex long" is a prefix of the valid ISO C type "_Complex long
+ double". */
-tree
-identifier_global_value (t)
- tree t;
+struct c_declspecs *
+finish_declspecs (struct c_declspecs *specs)
{
- return IDENTIFIER_GLOBAL_VALUE (t);
+ /* If a type was specified as a whole, we have no modifiers and are
+ done. */
+ if (specs->type != NULL_TREE)
+ {
+ gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p
+ && !specs->complex_p);
+ return specs;
+ }
+
+ /* If none of "void", "_Bool", "char", "int", "float" or "double"
+ has been specified, treat it as "int" unless "_Complex" is
+ present and there are no other specifiers. If we just have
+ "_Complex", it is equivalent to "_Complex double", but e.g.
+ "_Complex short" is equivalent to "_Complex short int". */
+ if (specs->typespec_word == cts_none)
+ {
+ if (specs->saturating_p)
+ {
+ error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
+ if (!targetm.fixed_point_supported_p ())
+ error ("fixed-point types not supported for this target");
+ specs->typespec_word = cts_fract;
+ }
+ else if (specs->long_p || specs->short_p
+ || specs->signed_p || specs->unsigned_p)
+ {
+ specs->typespec_word = cts_int;
+ }
+ else if (specs->complex_p)
+ {
+ specs->typespec_word = cts_double;
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C does not support plain %<complex%> meaning "
+ "%<double complex%>");
+ }
+ else
+ {
+ specs->typespec_word = cts_int;
+ specs->default_int_p = true;
+ /* We don't diagnose this here because grokdeclarator will
+ give more specific diagnostics according to whether it is
+ a function definition. */
+ }
+ }
+
+ /* If "signed" was specified, record this to distinguish "int" and
+ "signed int" in the case of a bit-field with
+ -funsigned-bitfields. */
+ specs->explicit_signed_p = specs->signed_p;
+
+ /* Now compute the actual type. */
+ switch (specs->typespec_word)
+ {
+ case cts_void:
+ gcc_assert (!specs->long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p
+ && !specs->complex_p);
+ specs->type = void_type_node;
+ break;
+ case cts_bool:
+ gcc_assert (!specs->long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p
+ && !specs->complex_p);
+ specs->type = boolean_type_node;
+ break;
+ case cts_char:
+ gcc_assert (!specs->long_p && !specs->short_p);
+ gcc_assert (!(specs->signed_p && specs->unsigned_p));
+ if (specs->signed_p)
+ specs->type = signed_char_type_node;
+ else if (specs->unsigned_p)
+ specs->type = unsigned_char_type_node;
+ else
+ specs->type = char_type_node;
+ if (specs->complex_p)
+ {
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C does not support complex integer types");
+ specs->type = build_complex_type (specs->type);
+ }
+ break;
+ case cts_int:
+ gcc_assert (!(specs->long_p && specs->short_p));
+ gcc_assert (!(specs->signed_p && specs->unsigned_p));
+ if (specs->long_long_p)
+ specs->type = (specs->unsigned_p
+ ? long_long_unsigned_type_node
+ : long_long_integer_type_node);
+ else if (specs->long_p)
+ specs->type = (specs->unsigned_p
+ ? long_unsigned_type_node
+ : long_integer_type_node);
+ else if (specs->short_p)
+ specs->type = (specs->unsigned_p
+ ? short_unsigned_type_node
+ : short_integer_type_node);
+ else
+ specs->type = (specs->unsigned_p
+ ? unsigned_type_node
+ : integer_type_node);
+ if (specs->complex_p)
+ {
+ pedwarn (input_location, OPT_pedantic,
+ "ISO C does not support complex integer types");
+ specs->type = build_complex_type (specs->type);
+ }
+ break;
+ case cts_float:
+ gcc_assert (!specs->long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p);
+ specs->type = (specs->complex_p
+ ? complex_float_type_node
+ : float_type_node);
+ break;
+ case cts_double:
+ gcc_assert (!specs->long_long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p);
+ if (specs->long_p)
+ {
+ specs->type = (specs->complex_p
+ ? complex_long_double_type_node
+ : long_double_type_node);
+ }
+ else
+ {
+ specs->type = (specs->complex_p
+ ? complex_double_type_node
+ : double_type_node);
+ }
+ break;
+ case cts_dfloat32:
+ case cts_dfloat64:
+ case cts_dfloat128:
+ gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
+ && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
+ if (specs->typespec_word == cts_dfloat32)
+ specs->type = dfloat32_type_node;
+ else if (specs->typespec_word == cts_dfloat64)
+ specs->type = dfloat64_type_node;
+ else
+ specs->type = dfloat128_type_node;
+ break;
+ case cts_fract:
+ gcc_assert (!specs->complex_p);
+ if (!targetm.fixed_point_supported_p ())
+ specs->type = integer_type_node;
+ else if (specs->saturating_p)
+ {
+ if (specs->long_long_p)
+ specs->type = specs->unsigned_p
+ ? sat_unsigned_long_long_fract_type_node
+ : sat_long_long_fract_type_node;
+ else if (specs->long_p)
+ specs->type = specs->unsigned_p
+ ? sat_unsigned_long_fract_type_node
+ : sat_long_fract_type_node;
+ else if (specs->short_p)
+ specs->type = specs->unsigned_p
+ ? sat_unsigned_short_fract_type_node
+ : sat_short_fract_type_node;
+ else
+ specs->type = specs->unsigned_p
+ ? sat_unsigned_fract_type_node
+ : sat_fract_type_node;
+ }
+ else
+ {
+ if (specs->long_long_p)
+ specs->type = specs->unsigned_p
+ ? unsigned_long_long_fract_type_node
+ : long_long_fract_type_node;
+ else if (specs->long_p)
+ specs->type = specs->unsigned_p
+ ? unsigned_long_fract_type_node
+ : long_fract_type_node;
+ else if (specs->short_p)
+ specs->type = specs->unsigned_p
+ ? unsigned_short_fract_type_node
+ : short_fract_type_node;
+ else
+ specs->type = specs->unsigned_p
+ ? unsigned_fract_type_node
+ : fract_type_node;
+ }
+ break;
+ case cts_accum:
+ gcc_assert (!specs->complex_p);
+ if (!targetm.fixed_point_supported_p ())
+ specs->type = integer_type_node;
+ else if (specs->saturating_p)
+ {
+ if (specs->long_long_p)
+ specs->type = specs->unsigned_p
+ ? sat_unsigned_long_long_accum_type_node
+ : sat_long_long_accum_type_node;
+ else if (specs->long_p)
+ specs->type = specs->unsigned_p
+ ? sat_unsigned_long_accum_type_node
+ : sat_long_accum_type_node;
+ else if (specs->short_p)
+ specs->type = specs->unsigned_p
+ ? sat_unsigned_short_accum_type_node
+ : sat_short_accum_type_node;
+ else
+ specs->type = specs->unsigned_p
+ ? sat_unsigned_accum_type_node
+ : sat_accum_type_node;
+ }
+ else
+ {
+ if (specs->long_long_p)
+ specs->type = specs->unsigned_p
+ ? unsigned_long_long_accum_type_node
+ : long_long_accum_type_node;
+ else if (specs->long_p)
+ specs->type = specs->unsigned_p
+ ? unsigned_long_accum_type_node
+ : long_accum_type_node;
+ else if (specs->short_p)
+ specs->type = specs->unsigned_p
+ ? unsigned_short_accum_type_node
+ : short_accum_type_node;
+ else
+ specs->type = specs->unsigned_p
+ ? unsigned_accum_type_node
+ : accum_type_node;
+ }
+ break;
+ default:
+ gcc_unreachable ();
+ }
+
+ return specs;
}
-/* Record a builtin type for C. If NAME is non-NULL, it is the name used;
- otherwise the name is found in ridpointers from RID_INDEX. */
+/* A subroutine of c_write_global_declarations. Perform final processing
+ on one file scope's declarations (or the external scope's declarations),
+ GLOBALS. */
-void
-record_builtin_type (rid_index, name, type)
- enum rid rid_index;
- const char *name;
- tree type;
+static void
+c_write_global_declarations_1 (tree globals)
{
- tree id;
- if (name == 0)
- id = ridpointers[(int) rid_index];
- else
- id = get_identifier (name);
- pushdecl (build_decl (TYPE_DECL, id, type));
+ tree decl;
+ bool reconsider;
+
+ /* Process the decls in the order they were written. */
+ for (decl = globals; decl; decl = TREE_CHAIN (decl))
+ {
+ /* Check for used but undefined static functions using the C
+ standard's definition of "used", and set TREE_NO_WARNING so
+ that check_global_declarations doesn't repeat the check. */
+ if (TREE_CODE (decl) == FUNCTION_DECL
+ && DECL_INITIAL (decl) == 0
+ && DECL_EXTERNAL (decl)
+ && !TREE_PUBLIC (decl)
+ && C_DECL_USED (decl))
+ {
+ pedwarn (input_location, 0, "%q+F used but never defined", decl);
+ TREE_NO_WARNING (decl) = 1;
+ }
+
+ wrapup_global_declaration_1 (decl);
+ }
+
+ do
+ {
+ reconsider = false;
+ for (decl = globals; decl; decl = TREE_CHAIN (decl))
+ reconsider |= wrapup_global_declaration_2 (decl);
+ }
+ while (reconsider);
+
+ for (decl = globals; decl; decl = TREE_CHAIN (decl))
+ check_global_declaration_1 (decl);
}
-/* Build the void_list_node (void_type_node having been created). */
-tree
-build_void_list_node ()
+/* A subroutine of c_write_global_declarations Emit debug information for each
+ of the declarations in GLOBALS. */
+
+static void
+c_write_global_declarations_2 (tree globals)
{
- tree t = build_tree_list (NULL_TREE, void_type_node);
- return t;
+ tree decl;
+
+ for (decl = globals; decl ; decl = TREE_CHAIN (decl))
+ debug_hooks->global_decl (decl);
}
+
+/* Preserve the external declarations scope across a garbage collect. */
+static GTY(()) tree ext_block;
+
+void
+c_write_global_declarations (void)
+{
+ tree t;
+
+ /* We don't want to do this if generating a PCH. */
+ if (pch_file)
+ return;
+
+ /* Don't waste time on further processing if -fsyntax-only or we've
+ encountered errors. */
+ if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
+ return;
+
+ /* Close the external scope. */
+ ext_block = pop_scope ();
+ external_scope = 0;
+ gcc_assert (!current_scope);
+
+ if (ext_block)
+ {
+ tree tmp = BLOCK_VARS (ext_block);
+ int flags;
+ FILE * stream = dump_begin (TDI_tu, &flags);
+ if (stream && tmp)
+ {
+ dump_node (tmp, flags & ~TDF_SLIM, stream);
+ dump_end (TDI_tu, stream);
+ }
+ }
+
+ /* Process all file scopes in this compilation, and the external_scope,
+ through wrapup_global_declarations and check_global_declarations. */
+ for (t = all_translation_units; t; t = TREE_CHAIN (t))
+ c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
+ c_write_global_declarations_1 (BLOCK_VARS (ext_block));
+
+ /* We're done parsing; proceed to optimize and emit assembly.
+ FIXME: shouldn't be the front end's responsibility to call this. */
+ cgraph_optimize ();
+
+ /* After cgraph has had a chance to emit everything that's going to
+ be emitted, output debug information for globals. */
+ if (errorcount == 0 && sorrycount == 0)
+ {
+ timevar_push (TV_SYMOUT);
+ for (t = all_translation_units; t; t = TREE_CHAIN (t))
+ c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
+ c_write_global_declarations_2 (BLOCK_VARS (ext_block));
+ timevar_pop (TV_SYMOUT);
+ }
+
+ ext_block = NULL;
+}
+
+#include "gt-c-decl.h"
projects / msp430-gcc.git / blobdiff