+++ /dev/null
-/****************************************************************************
- * *
- * GNAT COMPILER COMPONENTS *
- * *
- * T R A N S *
- * *
- * C Implementation File *
- * *
- * $Revision: 1.11.2.2 $
- * *
- * Copyright (C) 1992-2001, Free Software Foundation, Inc. *
- * *
- * GNAT is free software; you can redistribute it and/or modify it under *
- * terms of the GNU General Public License as published by the Free Soft- *
- * ware Foundation; either version 2, or (at your option) any later ver- *
- * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
- * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
- * for more details. You should have received a copy of the GNU General *
- * Public License distributed with GNAT; see file COPYING. If not, write *
- * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
- * MA 02111-1307, USA. *
- * *
- * GNAT was originally developed by the GNAT team at New York University. *
- * Extensive contributions were provided by Ada Core Technologies Inc. *
- * *
- ****************************************************************************/
-
-#include "config.h"
-#include "system.h"
-#include "tree.h"
-#include "real.h"
-#include "flags.h"
-#include "rtl.h"
-#include "expr.h"
-#include "ggc.h"
-#include "function.h"
-#include "debug.h"
-#include "output.h"
-#include "ada.h"
-#include "types.h"
-#include "atree.h"
-#include "elists.h"
-#include "namet.h"
-#include "nlists.h"
-#include "snames.h"
-#include "stringt.h"
-#include "uintp.h"
-#include "urealp.h"
-#include "fe.h"
-#include "sinfo.h"
-#include "einfo.h"
-#include "ada-tree.h"
-#include "gigi.h"
-
-int max_gnat_nodes;
-int number_names;
-struct Node *Nodes_Ptr;
-Node_Id *Next_Node_Ptr;
-Node_Id *Prev_Node_Ptr;
-struct Elist_Header *Elists_Ptr;
-struct Elmt_Item *Elmts_Ptr;
-struct String_Entry *Strings_Ptr;
-Char_Code *String_Chars_Ptr;
-struct List_Header *List_Headers_Ptr;
-
-/* Current filename without path. */
-const char *ref_filename;
-
-/* Flag indicating whether file names are discarded in exception messages */
-int discard_file_names;
-
-/* If true, then gigi is being called on an analyzed but unexpanded
- tree, and the only purpose of the call is to properly annotate
- types with representation information. */
-int type_annotate_only;
-
-/* List of TREE_LIST nodes representing a block stack. TREE_VALUE
- of each gives the variable used for the setjmp buffer in the current
- block, if any. TREE_PURPOSE gives the bottom condition for a loop,
- if this block is for a loop. The latter is only used to save the tree
- over GC. */
-tree gnu_block_stack;
-
-/* List of TREE_LIST nodes representing a stack of exception pointer
- variables. TREE_VALUE is the VAR_DECL that stores the address of
- the raised exception. Nonzero means we are in an exception
- handler. Set to error_mark_node in the zero-cost case. */
-static tree gnu_except_ptr_stack;
-
-/* Map GNAT tree codes to GCC tree codes for simple expressions. */
-static enum tree_code gnu_codes[Number_Node_Kinds];
-
-/* Current node being treated, in case gigi_abort called. */
-Node_Id error_gnat_node;
-
-/* Variable that stores a list of labels to be used as a goto target instead of
- a return in some functions. See processing for N_Subprogram_Body. */
-static tree gnu_return_label_stack;
-
-static tree tree_transform PARAMS((Node_Id));
-static void elaborate_all_entities PARAMS((Node_Id));
-static void process_freeze_entity PARAMS((Node_Id));
-static void process_inlined_subprograms PARAMS((Node_Id));
-static void process_decls PARAMS((List_Id, List_Id, Node_Id,
- int, int));
-static tree emit_access_check PARAMS((tree));
-static tree emit_discriminant_check PARAMS((tree, Node_Id));
-static tree emit_range_check PARAMS((tree, Node_Id));
-static tree emit_index_check PARAMS((tree, tree, tree, tree));
-static tree emit_check PARAMS((tree, tree));
-static tree convert_with_check PARAMS((Entity_Id, tree,
- int, int, int));
-static int addressable_p PARAMS((tree));
-static tree assoc_to_constructor PARAMS((Node_Id, tree));
-static tree extract_values PARAMS((tree, tree));
-static tree pos_to_constructor PARAMS((Node_Id, tree, Entity_Id));
-static tree maybe_implicit_deref PARAMS((tree));
-static tree gnat_stabilize_reference_1 PARAMS((tree, int));
-static int build_unit_elab PARAMS((Entity_Id, int, tree));
-
-/* Constants for +0.5 and -0.5 for float-to-integer rounding. */
-static REAL_VALUE_TYPE dconstp5;
-static REAL_VALUE_TYPE dconstmp5;
-\f
-/* This is the main program of the back-end. It sets up all the table
- structures and then generates code. */
-
-void
-gigi (gnat_root, max_gnat_node, number_name,
- nodes_ptr, next_node_ptr, prev_node_ptr, elists_ptr, elmts_ptr,
- strings_ptr, string_chars_ptr, list_headers_ptr,
- number_units, file_info_ptr,
- standard_integer, standard_long_long_float, standard_exception_type,
- gigi_operating_mode)
-
- Node_Id gnat_root;
- int max_gnat_node;
- int number_name;
-
- struct Node *nodes_ptr;
- Node_Id *next_node_ptr;
- Node_Id *prev_node_ptr;
- struct Elist_Header *elists_ptr;
- struct Elmt_Item *elmts_ptr;
- struct String_Entry *strings_ptr;
- Char_Code *string_chars_ptr;
- struct List_Header *list_headers_ptr;
- Int number_units ATTRIBUTE_UNUSED;
- char *file_info_ptr ATTRIBUTE_UNUSED;
-
- Entity_Id standard_integer;
- Entity_Id standard_long_long_float;
- Entity_Id standard_exception_type;
-
- Int gigi_operating_mode;
-{
- tree gnu_standard_long_long_float;
- tree gnu_standard_exception_type;
-
- max_gnat_nodes = max_gnat_node;
- number_names = number_name;
- Nodes_Ptr = nodes_ptr - First_Node_Id;
- Next_Node_Ptr = next_node_ptr - First_Node_Id;
- Prev_Node_Ptr = prev_node_ptr - First_Node_Id;
- Elists_Ptr = elists_ptr - First_Elist_Id;
- Elmts_Ptr = elmts_ptr - First_Elmt_Id;
- Strings_Ptr = strings_ptr - First_String_Id;
- String_Chars_Ptr = string_chars_ptr;
- List_Headers_Ptr = list_headers_ptr - First_List_Id;
-
- type_annotate_only = (gigi_operating_mode == 1);
-
- /* See if we should discard file names in exception messages. */
- discard_file_names = (Global_Discard_Names || Debug_Flag_NN);
-
- if (Nkind (gnat_root) != N_Compilation_Unit)
- gigi_abort (301);
-
- set_lineno (gnat_root, 0);
-
- /* Initialize ourselves. */
- init_gnat_to_gnu ();
- init_dummy_type ();
- init_code_table ();
-
- /* Enable GNAT stack checking method if needed */
- if (!Stack_Check_Probes_On_Target)
- set_stack_check_libfunc (gen_rtx (SYMBOL_REF, Pmode, "_gnat_stack_check"));
-
- /* Save the type we made for integer as the type for Standard.Integer.
- Then make the rest of the standard types. Note that some of these
- may be subtypes. */
- save_gnu_tree (Base_Type (standard_integer),
- TYPE_NAME (integer_type_node), 0);
-
- ggc_add_tree_root (&gnu_block_stack, 1);
- ggc_add_tree_root (&gnu_except_ptr_stack, 1);
- ggc_add_tree_root (&gnu_return_label_stack, 1);
- gnu_except_ptr_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
-
- dconstp5 = REAL_VALUE_ATOF ("0.5", DFmode);
- dconstmp5 = REAL_VALUE_ATOF ("-0.5", DFmode);
-
- gnu_standard_long_long_float
- = gnat_to_gnu_entity (Base_Type (standard_long_long_float), NULL_TREE, 0);
- gnu_standard_exception_type
- = gnat_to_gnu_entity (Base_Type (standard_exception_type), NULL_TREE, 0);
-
- init_gigi_decls (gnu_standard_long_long_float, gnu_standard_exception_type);
-
- /* Emit global symbols containing context list info for the SGI Workshop
- debugger */
-
-#ifdef MIPS_DEBUGGING_INFO
- if (Spec_Context_List != 0)
- emit_unit_label (Spec_Context_List, Spec_Filename);
-
- if (Body_Context_List != 0)
- emit_unit_label (Body_Context_List, Body_Filename);
-#endif
-
-#ifdef ASM_OUTPUT_IDENT
- if (Present (Ident_String (Main_Unit)))
- ASM_OUTPUT_IDENT
- (asm_out_file,
- TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit))));
-#endif
-
- gnat_to_code (gnat_root);
-}
-
-\f
-/* This function is the driver of the GNAT to GCC tree transformation process.
- GNAT_NODE is the root of some gnat tree. It generates code for that
- part of the tree. */
-
-void
-gnat_to_code (gnat_node)
- Node_Id gnat_node;
-{
- tree gnu_root;
-
- /* Save node number in case error */
- error_gnat_node = gnat_node;
-
- gnu_root = tree_transform (gnat_node);
-
- /* This should just generate code, not return a value. If it returns
- a value, something is wrong. */
- if (gnu_root != error_mark_node)
- gigi_abort (302);
-}
-
-/* GNAT_NODE is the root of some GNAT tree. Return the root of the GCC
- tree corresponding to that GNAT tree. Normally, no code is generated.
- We just return an equivalent tree which is used elsewhere to generate
- code. */
-
-tree
-gnat_to_gnu (gnat_node)
- Node_Id gnat_node;
-{
- tree gnu_root;
-
- /* Save node number in case error */
- error_gnat_node = gnat_node;
-
- gnu_root = tree_transform (gnat_node);
-
- /* If we got no code as a result, something is wrong. */
- if (gnu_root == error_mark_node && ! type_annotate_only)
- gigi_abort (303);
-
- return gnu_root;
-}
-\f
-/* This function is the driver of the GNAT to GCC tree transformation process.
- It is the entry point of the tree transformer. GNAT_NODE is the root of
- some GNAT tree. Return the root of the corresponding GCC tree or
- error_mark_node to signal that there is no GCC tree to return.
-
- The latter is the case if only code generation actions have to be performed
- like in the case of if statements, loops, etc. This routine is wrapped
- in the above two routines for most purposes. */
-
-static tree
-tree_transform (gnat_node)
- Node_Id gnat_node;
-{
- tree gnu_result = error_mark_node; /* Default to no value. */
- tree gnu_result_type = void_type_node;
- tree gnu_expr;
- tree gnu_lhs, gnu_rhs;
- Node_Id gnat_temp;
- Entity_Id gnat_temp_type;
-
- /* Set input_file_name and lineno from the Sloc in the GNAT tree. */
- set_lineno (gnat_node, 0);
-
- /* If this is a Statement and we are at top level, we add the statement
- as an elaboration for a null tree. That will cause it to be placed
- in the elaboration procedure. */
- if (global_bindings_p ()
- && ((IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)
- && Nkind (gnat_node) != N_Null_Statement)
- || Nkind (gnat_node) == N_Procedure_Call_Statement
- || Nkind (gnat_node) == N_Label
- || (Nkind (gnat_node) == N_Handled_Sequence_Of_Statements
- && (Present (Exception_Handlers (gnat_node))
- || Present (At_End_Proc (gnat_node))))
- || ((Nkind (gnat_node) == N_Raise_Constraint_Error
- || Nkind (gnat_node) == N_Raise_Storage_Error
- || Nkind (gnat_node) == N_Raise_Program_Error)
- && (Ekind (Etype (gnat_node)) == E_Void))))
- {
- add_pending_elaborations (NULL_TREE, make_transform_expr (gnat_node));
-
- return error_mark_node;
- }
-
- /* If this node is a non-static subexpression and we are only
- annotating types, make this into a NULL_EXPR for non-VOID types
- and error_mark_node for void return types. But allow
- N_Identifier since we use it for lots of things, including
- getting trees for discriminants. */
-
- if (type_annotate_only
- && IN (Nkind (gnat_node), N_Subexpr)
- && Nkind (gnat_node) != N_Identifier
- && ! Compile_Time_Known_Value (gnat_node))
- {
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (TREE_CODE (gnu_result_type) == VOID_TYPE)
- return error_mark_node;
- else
- return build1 (NULL_EXPR, gnu_result_type,
- build_call_raise (raise_constraint_error_decl));
- }
-
- switch (Nkind (gnat_node))
- {
- /********************************/
- /* Chapter 2: Lexical Elements: */
- /********************************/
-
- case N_Identifier:
- case N_Expanded_Name:
- case N_Operator_Symbol:
- case N_Defining_Identifier:
-
- /* If the Etype of this node does not equal the Etype of the
- Entity, something is wrong with the entity map, probably in
- generic instantiation. However, this does not apply to
- types. Since we sometime have strange Ekind's, just do
- this test for objects. Also, if the Etype of the Entity
- is private, the Etype of the N_Identifier is allowed to be the
- full type and also we consider a packed array type to be the
- same as the original type. Finally, if the types are Itypes,
- one may be a copy of the other, which is also legal. */
-
- gnat_temp = (Nkind (gnat_node) == N_Defining_Identifier
- ? gnat_node : Entity (gnat_node));
- gnat_temp_type = Etype (gnat_temp);
-
- if (Etype (gnat_node) != gnat_temp_type
- && ! (Is_Packed (gnat_temp_type)
- && Etype (gnat_node) == Packed_Array_Type (gnat_temp_type))
- && ! (IN (Ekind (gnat_temp_type), Private_Kind)
- && Present (Full_View (gnat_temp_type))
- && ((Etype (gnat_node) == Full_View (gnat_temp_type))
- || (Is_Packed (Full_View (gnat_temp_type))
- && Etype (gnat_node) ==
- Packed_Array_Type (Full_View (gnat_temp_type)))))
- && (!Is_Itype (Etype (gnat_node)) || !Is_Itype (gnat_temp_type))
- && (Ekind (gnat_temp) == E_Variable
- || Ekind (gnat_temp) == E_Component
- || Ekind (gnat_temp) == E_Constant
- || Ekind (gnat_temp) == E_Loop_Parameter
- || IN (Ekind (gnat_temp), Formal_Kind)))
- gigi_abort (304);
-
- /* If this is a reference to a deferred constant whose partial view
- is an unconstrained private type, the proper type is on the full
- view of the constant, not on the full view of the type, which may
- be unconstrained.
-
- This may be a reference to a type, for example in the prefix of the
- attribute Position, generated for dispatching code (see Make_DT in
- exp_disp,adb). In that case we need the type itself, not is parent,
- in particular if it is a derived type */
-
- if (Is_Private_Type (gnat_temp_type)
- && Has_Unknown_Discriminants (gnat_temp_type)
- && Present (Full_View (gnat_temp))
- && ! Is_Type (gnat_temp))
- {
- gnat_temp = Full_View (gnat_temp);
- gnat_temp_type = Etype (gnat_temp);
- gnu_result_type = get_unpadded_type (gnat_temp_type);
- }
- else
- {
- /* Expand the type of this identitier first, in case it is
- an enumeral literal, which only get made when the type
- is expanded. There is no order-of-elaboration issue here.
- We want to use the Actual_Subtype if it has already been
- elaborated, otherwise the Etype. Avoid using Actual_Subtype
- for packed arrays to simplify things. */
- if ((Ekind (gnat_temp) == E_Constant
- || Ekind (gnat_temp) == E_Variable || Is_Formal (gnat_temp))
- && ! (Is_Array_Type (Etype (gnat_temp))
- && Present (Packed_Array_Type (Etype (gnat_temp))))
- && Present (Actual_Subtype (gnat_temp))
- && present_gnu_tree (Actual_Subtype (gnat_temp)))
- gnat_temp_type = Actual_Subtype (gnat_temp);
- else
- gnat_temp_type = Etype (gnat_node);
-
- gnu_result_type = get_unpadded_type (gnat_temp_type);
- }
-
- gnu_result = gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0);
-
- /* If we are in an exception handler, force this variable into memory
- to ensure optimization does not remove stores that appear
- redundant but are actually needed in case an exception occurs.
-
- ??? Note that we need not do this if the variable is declared within
- the handler, only if it is referenced in the handler and declared
- in an enclosing block, but we have no way of testing that
- right now. */
- if (TREE_VALUE (gnu_except_ptr_stack) != 0)
- {
- mark_addressable (gnu_result);
- flush_addressof (gnu_result);
- }
-
- /* Some objects (such as parameters passed by reference, globals of
- variable size, and renamed objects) actually represent the address
- of the object. In that case, we must do the dereference. Likewise,
- deal with parameters to foreign convention subprograms. Call fold
- here since GNU_RESULT may be a CONST_DECL. */
- if (DECL_P (gnu_result)
- && (DECL_BY_REF_P (gnu_result)
- || DECL_BY_COMPONENT_PTR_P (gnu_result)))
- {
- int ro = DECL_POINTS_TO_READONLY_P (gnu_result);
-
- if (DECL_BY_COMPONENT_PTR_P (gnu_result))
- gnu_result = convert (build_pointer_type (gnu_result_type),
- gnu_result);
-
- gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE,
- fold (gnu_result));
- TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) = ro;
- }
-
- /* The GNAT tree has the type of a function as the type of its result.
- Also use the type of the result if the Etype is a subtype which
- is nominally unconstrained. But remove any padding from the
- resulting type. */
- if (TREE_CODE (TREE_TYPE (gnu_result)) == FUNCTION_TYPE
- || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type))
- {
- gnu_result_type = TREE_TYPE (gnu_result);
- if (TREE_CODE (gnu_result_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_result_type))
- gnu_result_type = TREE_TYPE (TYPE_FIELDS (gnu_result_type));
- }
-
- /* We always want to return the underlying INTEGER_CST for an
- enumeration literal to avoid the need to call fold in lots
- of places. But don't do this is the parent will be taking
- the address of this object. */
- if (TREE_CODE (gnu_result) == CONST_DECL)
- {
- gnat_temp = Parent (gnat_node);
- if (DECL_CONST_CORRESPONDING_VAR (gnu_result) == 0
- || (Nkind (gnat_temp) != N_Reference
- && ! (Nkind (gnat_temp) == N_Attribute_Reference
- && ((Get_Attribute_Id (Attribute_Name (gnat_temp))
- == Attr_Address)
- || (Get_Attribute_Id (Attribute_Name (gnat_temp))
- == Attr_Access)
- || (Get_Attribute_Id (Attribute_Name (gnat_temp))
- == Attr_Unchecked_Access)
- || (Get_Attribute_Id (Attribute_Name (gnat_temp))
- == Attr_Unrestricted_Access)))))
- gnu_result = DECL_INITIAL (gnu_result);
- }
- break;
-
- case N_Integer_Literal:
- {
- tree gnu_type;
-
- /* Get the type of the result, looking inside any padding and
- left-justified modular types. Then get the value in that type. */
- gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type))
- gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
-
- gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type);
- /* Get the type of the result, looking inside any padding and
- left-justified modular types. Then get the value in that type. */
- gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type))
- gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
-
- gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type);
-
- /* If the result overflows (meaning it doesn't fit in its base type)
- or is outside of the range of the subtype, we have an illegal tree
- entry, so abort. Note that the test for of types with biased
- representation is harder, so we don't test in that case. */
- if (TREE_CONSTANT_OVERFLOW (gnu_result)
- || (TREE_CODE (TYPE_MIN_VALUE (gnu_result_type)) == INTEGER_CST
- && ! TYPE_BIASED_REPRESENTATION_P (gnu_result_type)
- && tree_int_cst_lt (gnu_result,
- TYPE_MIN_VALUE (gnu_result_type)))
- || (TREE_CODE (TYPE_MAX_VALUE (gnu_result_type)) == INTEGER_CST
- && ! TYPE_BIASED_REPRESENTATION_P (gnu_result_type)
- && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_result_type),
- gnu_result)))
- gigi_abort (305);
- }
- break;
-
- case N_Character_Literal:
- /* If a Entity is present, it means that this was one of the
- literals in a user-defined character type. In that case,
- just return the value in the CONST_DECL. Otherwise, use the
- character code. In that case, the base type should be an
- INTEGER_TYPE, but we won't bother checking for that. */
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- if (Present (Entity (gnat_node)))
- gnu_result = DECL_INITIAL (get_gnu_tree (Entity (gnat_node)));
- else
- gnu_result = convert (gnu_result_type,
- build_int_2 (Char_Literal_Value (gnat_node), 0));
- break;
-
- case N_Real_Literal:
- /* If this is of a fixed-point type, the value we want is the
- value of the corresponding integer. */
- if (IN (Ekind (Underlying_Type (Etype (gnat_node))), Fixed_Point_Kind))
- {
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = UI_To_gnu (Corresponding_Integer_Value (gnat_node),
- gnu_result_type);
- if (TREE_CONSTANT_OVERFLOW (gnu_result)
-#if 0
- || (TREE_CODE (TYPE_MIN_VALUE (gnu_result_type)) == INTEGER_CST
- && tree_int_cst_lt (gnu_result,
- TYPE_MIN_VALUE (gnu_result_type)))
- || (TREE_CODE (TYPE_MAX_VALUE (gnu_result_type)) == INTEGER_CST
- && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_result_type),
- gnu_result))
-#endif
- )
- gigi_abort (305);
- }
- /* We should never see a Vax_Float type literal, since the front end
- is supposed to transform these using appropriate conversions */
- else if (Vax_Float (Underlying_Type (Etype (gnat_node))))
- gigi_abort (334);
-
- else
- {
- Ureal ur_realval = Realval (gnat_node);
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* If the real value is zero, so is the result. Otherwise,
- convert it to a machine number if it isn't already. That
- forces BASE to 0 or 2 and simplifies the rest of our logic. */
- if (UR_Is_Zero (ur_realval))
- gnu_result = convert (gnu_result_type, integer_zero_node);
- else
- {
- if (! Is_Machine_Number (gnat_node))
- ur_realval
- = Machine (Base_Type (Underlying_Type (Etype (gnat_node))),
- ur_realval, Round_Even);
-
- gnu_result
- = UI_To_gnu (Numerator (ur_realval), gnu_result_type);
-
- /* If we have a base of zero, divide by the denominator.
- Otherwise, the base must be 2 and we scale the value, which
- we know can fit in the mantissa of the type (hence the use
- of that type above). */
- if (Rbase (ur_realval) == 0)
- gnu_result
- = build_binary_op (RDIV_EXPR,
- get_base_type (gnu_result_type),
- gnu_result,
- UI_To_gnu (Denominator (ur_realval),
- gnu_result_type));
- else if (Rbase (ur_realval) != 2)
- gigi_abort (336);
-
- else
- gnu_result
- = build_real (gnu_result_type,
- REAL_VALUE_LDEXP
- (TREE_REAL_CST (gnu_result),
- - UI_To_Int (Denominator (ur_realval))));
- }
-
- /* Now see if we need to negate the result. Do it this way to
- properly handle -0. */
- if (UR_Is_Negative (Realval (gnat_node)))
- gnu_result
- = build_unary_op (NEGATE_EXPR, get_base_type (gnu_result_type),
- gnu_result);
- }
-
- break;
-
- case N_String_Literal:
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- if (TYPE_PRECISION (TREE_TYPE (gnu_result_type)) == HOST_BITS_PER_CHAR)
- {
- /* We assume here that all strings are of type standard.string.
- "Weird" types of string have been converted to an aggregate
- by the expander. */
- String_Id gnat_string = Strval (gnat_node);
- int length = String_Length (gnat_string);
- char *string = (char *) alloca (length + 1);
- int i;
-
- /* Build the string with the characters in the literal. Note
- that Ada strings are 1-origin. */
- for (i = 0; i < length; i++)
- string[i] = Get_String_Char (gnat_string, i + 1);
-
- /* Put a null at the end of the string in case it's in a context
- where GCC will want to treat it as a C string. */
- string[i] = 0;
-
- gnu_result = build_string (length, string);
-
- /* Strings in GCC don't normally have types, but we want
- this to not be converted to the array type. */
- TREE_TYPE (gnu_result) = gnu_result_type;
- }
- else
- {
- /* Build a list consisting of each character, then make
- the aggregate. */
- String_Id gnat_string = Strval (gnat_node);
- int length = String_Length (gnat_string);
- int i;
- tree gnu_list = NULL_TREE;
-
- for (i = 0; i < length; i++)
- gnu_list
- = tree_cons (NULL_TREE,
- convert (TREE_TYPE (gnu_result_type),
- build_int_2 (Get_String_Char (gnat_string,
- i + 1),
- 0)),
- gnu_list);
-
- gnu_result
- = build_constructor (gnu_result_type, nreverse (gnu_list));
- }
- break;
-
- case N_Pragma:
- if (type_annotate_only)
- break;
-
- /* Check for (and ignore) unrecognized pragma */
- if (! Is_Pragma_Name (Chars (gnat_node)))
- break;
-
- switch (Get_Pragma_Id (Chars (gnat_node)))
- {
- case Pragma_Inspection_Point:
- /* Do nothing at top level: all such variables are already
- viewable. */
- if (global_bindings_p ())
- break;
-
- set_lineno (gnat_node, 1);
- for (gnat_temp = First (Pragma_Argument_Associations (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next (gnat_temp))
- {
- gnu_expr = gnat_to_gnu (Expression (gnat_temp));
- if (TREE_CODE (gnu_expr) == UNCONSTRAINED_ARRAY_REF)
- gnu_expr = TREE_OPERAND (gnu_expr, 0);
-
- gnu_expr = build1 (USE_EXPR, void_type_node, gnu_expr);
- TREE_SIDE_EFFECTS (gnu_expr) = 1;
- expand_expr_stmt (gnu_expr);
- }
- break;
-
- case Pragma_Optimize:
- switch (Chars (Expression
- (First (Pragma_Argument_Associations (gnat_node)))))
- {
- case Name_Time: case Name_Space:
- if (optimize == 0)
- post_error ("insufficient -O value?", gnat_node);
- break;
-
- case Name_Off:
- if (optimize != 0)
- post_error ("must specify -O0?", gnat_node);
- break;
-
- default:
- gigi_abort (331);
- break;
- }
- break;
-
- case Pragma_Reviewable:
- if (write_symbols == NO_DEBUG)
- post_error ("must specify -g?", gnat_node);
- break;
- }
- break;
-
- /**************************************/
- /* Chapter 3: Declarations and Types: */
- /**************************************/
-
- case N_Subtype_Declaration:
- case N_Full_Type_Declaration:
- case N_Incomplete_Type_Declaration:
- case N_Private_Type_Declaration:
- case N_Private_Extension_Declaration:
- case N_Task_Type_Declaration:
- process_type (Defining_Entity (gnat_node));
- break;
-
- case N_Object_Declaration:
- case N_Exception_Declaration:
- gnat_temp = Defining_Entity (gnat_node);
-
- /* If we are just annotating types and this object has an unconstrained
- or task type, don't elaborate it. */
- if (type_annotate_only
- && (((Is_Array_Type (Etype (gnat_temp))
- || Is_Record_Type (Etype (gnat_temp)))
- && ! Is_Constrained (Etype (gnat_temp)))
- || Is_Concurrent_Type (Etype (gnat_temp))))
- break;
-
- if (Present (Expression (gnat_node))
- && ! (Nkind (gnat_node) == N_Object_Declaration
- && No_Initialization (gnat_node))
- && (! type_annotate_only
- || Compile_Time_Known_Value (Expression (gnat_node))))
- {
- gnu_expr = gnat_to_gnu (Expression (gnat_node));
- if (Do_Range_Check (Expression (gnat_node)))
- gnu_expr = emit_range_check (gnu_expr, Etype (gnat_temp));
-
- /* If this object has its elaboration delayed, we must force
- evaluation of GNU_EXPR right now and save it for when the object
- is frozen. */
- if (Present (Freeze_Node (gnat_temp)))
- {
- if ((Is_Public (gnat_temp) || global_bindings_p ())
- && ! TREE_CONSTANT (gnu_expr))
- gnu_expr
- = create_var_decl (create_concat_name (gnat_temp, "init"),
- NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
- 0, Is_Public (gnat_temp), 0, 0, 0);
- else
- gnu_expr = maybe_variable (gnu_expr, Expression (gnat_node));
-
- save_gnu_tree (gnat_node, gnu_expr, 1);
- }
- }
- else
- gnu_expr = 0;
-
- if (type_annotate_only && gnu_expr != 0
- && TREE_CODE (gnu_expr) == ERROR_MARK)
- gnu_expr = 0;
-
- if (No (Freeze_Node (gnat_temp)))
- gnat_to_gnu_entity (gnat_temp, gnu_expr, 1);
- break;
-
- case N_Object_Renaming_Declaration:
-
- gnat_temp = Defining_Entity (gnat_node);
-
- /* Don't do anything if this renaming handled by the front end.
- or if we are just annotating types and this object has an
- unconstrained or task type, don't elaborate it. */
- if (! Is_Renaming_Of_Object (gnat_temp)
- && ! (type_annotate_only
- && (((Is_Array_Type (Etype (gnat_temp))
- || Is_Record_Type (Etype (gnat_temp)))
- && ! Is_Constrained (Etype (gnat_temp)))
- || Is_Concurrent_Type (Etype (gnat_temp)))))
- {
- gnu_expr = gnat_to_gnu (Renamed_Object (gnat_temp));
- gnat_to_gnu_entity (gnat_temp, gnu_expr, 1);
- }
- break;
-
- case N_Implicit_Label_Declaration:
- gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
- break;
-
- case N_Subprogram_Renaming_Declaration:
- case N_Package_Renaming_Declaration:
- case N_Exception_Renaming_Declaration:
- case N_Number_Declaration:
- /* These are fully handled in the front end. */
- break;
-
- /*************************************/
- /* Chapter 4: Names and Expressions: */
- /*************************************/
-
- case N_Explicit_Dereference:
- gnu_result = gnat_to_gnu (Prefix (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* Emit access check if necessary */
- if (Do_Access_Check (gnat_node))
- gnu_result = emit_access_check (gnu_result);
-
- gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
- break;
-
- case N_Indexed_Component:
- {
- tree gnu_array_object = gnat_to_gnu (Prefix (gnat_node));
- tree gnu_type;
- int ndim;
- int i;
- Node_Id *gnat_expr_array;
-
- /* Emit access check if necessary */
- if (Do_Access_Check (gnat_node))
- gnu_array_object = emit_access_check (gnu_array_object);
-
- gnu_array_object = maybe_implicit_deref (gnu_array_object);
- gnu_array_object = maybe_unconstrained_array (gnu_array_object);
-
- /* If we got a padded type, remove it too. */
- if (TREE_CODE (TREE_TYPE (gnu_array_object)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_array_object)))
- gnu_array_object
- = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_array_object))),
- gnu_array_object);
-
- gnu_result = gnu_array_object;
-
- /* First compute the number of dimensions of the array, then
- fill the expression array, the order depending on whether
- this is a Convention_Fortran array or not. */
- for (ndim = 1, gnu_type = TREE_TYPE (gnu_array_object);
- TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
- && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type));
- ndim++, gnu_type = TREE_TYPE (gnu_type))
- ;
-
- gnat_expr_array = (Node_Id *) alloca (ndim * sizeof (Node_Id));
-
- if (TYPE_CONVENTION_FORTRAN_P (TREE_TYPE (gnu_array_object)))
- for (i = ndim - 1, gnat_temp = First (Expressions (gnat_node));
- i >= 0;
- i--, gnat_temp = Next (gnat_temp))
- gnat_expr_array[i] = gnat_temp;
- else
- for (i = 0, gnat_temp = First (Expressions (gnat_node));
- i < ndim;
- i++, gnat_temp = Next (gnat_temp))
- gnat_expr_array[i] = gnat_temp;
-
- for (i = 0, gnu_type = TREE_TYPE (gnu_array_object);
- i < ndim; i++, gnu_type = TREE_TYPE (gnu_type))
- {
- if (TREE_CODE (gnu_type) != ARRAY_TYPE)
- gigi_abort (307);
-
- gnat_temp = gnat_expr_array[i];
- gnu_expr = gnat_to_gnu (gnat_temp);
-
- if (Do_Range_Check (gnat_temp))
- gnu_expr
- = emit_index_check
- (gnu_array_object, gnu_expr,
- TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
- TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
-
- gnu_result = build_binary_op (ARRAY_REF, NULL_TREE,
- gnu_result, gnu_expr);
- }
- }
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- break;
-
- case N_Slice:
- {
- tree gnu_type;
- Node_Id gnat_range_node = Discrete_Range (gnat_node);
-
- gnu_result = gnat_to_gnu (Prefix (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* Emit access check if necessary */
- if (Do_Access_Check (gnat_node))
- gnu_result = emit_access_check (gnu_result);
-
- /* Do any implicit dereferences of the prefix and do any needed
- range check. */
- gnu_result = maybe_implicit_deref (gnu_result);
- gnu_result = maybe_unconstrained_array (gnu_result);
- gnu_type = TREE_TYPE (gnu_result);
- if (Do_Range_Check (gnat_range_node))
- {
- /* Get the bounds of the slice. */
- tree gnu_index_type
- = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_result_type));
- tree gnu_min_expr = TYPE_MIN_VALUE (gnu_index_type);
- tree gnu_max_expr = TYPE_MAX_VALUE (gnu_index_type);
- tree gnu_expr_l, gnu_expr_h, gnu_expr_type;
-
- /* Check to see that the minimum slice value is in range */
- gnu_expr_l
- = emit_index_check
- (gnu_result, gnu_min_expr,
- TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
- TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
-
- /* Check to see that the maximum slice value is in range */
- gnu_expr_h
- = emit_index_check
- (gnu_result, gnu_max_expr,
- TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
- TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
-
- /* Derive a good type to convert everything too */
- gnu_expr_type = get_base_type (TREE_TYPE (gnu_expr_l));
-
- /* Build a compound expression that does the range checks */
- gnu_expr
- = build_binary_op (COMPOUND_EXPR, gnu_expr_type,
- convert (gnu_expr_type, gnu_expr_h),
- convert (gnu_expr_type, gnu_expr_l));
-
- /* Build a conditional expression that returns the range checks
- expression if the slice range is not null (max >= min) or
- returns the min if the slice range is null */
- gnu_expr
- = fold (build (COND_EXPR, gnu_expr_type,
- build_binary_op (GE_EXPR, gnu_expr_type,
- convert (gnu_expr_type,
- gnu_max_expr),
- convert (gnu_expr_type,
- gnu_min_expr)),
- gnu_expr, gnu_min_expr));
- }
- else
- gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
-
- gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type,
- gnu_result, gnu_expr);
- }
- break;
-
- case N_Selected_Component:
- {
- tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
- Entity_Id gnat_field = Entity (Selector_Name (gnat_node));
- Entity_Id gnat_pref_type = Etype (Prefix (gnat_node));
- tree gnu_field;
-
- while (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind)
- || IN (Ekind (gnat_pref_type), Access_Kind))
- {
- if (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind))
- gnat_pref_type = Underlying_Type (gnat_pref_type);
- else if (IN (Ekind (gnat_pref_type), Access_Kind))
- gnat_pref_type = Designated_Type (gnat_pref_type);
- }
-
- if (Do_Access_Check (gnat_node))
- gnu_prefix = emit_access_check (gnu_prefix);
-
- gnu_prefix = maybe_implicit_deref (gnu_prefix);
-
- /* For discriminant references in tagged types always substitute the
- corresponding discriminant as the actual selected component. */
-
- if (Is_Tagged_Type (gnat_pref_type))
- while (Present (Corresponding_Discriminant (gnat_field)))
- gnat_field = Corresponding_Discriminant (gnat_field);
-
- /* For discriminant references of untagged types always substitute the
- corresponding girder discriminant. */
-
- else if (Present (Corresponding_Discriminant (gnat_field)))
- gnat_field = Original_Record_Component (gnat_field);
-
- /* Handle extracting the real or imaginary part of a complex.
- The real part is the first field and the imaginary the last. */
-
- if (TREE_CODE (TREE_TYPE (gnu_prefix)) == COMPLEX_TYPE)
- gnu_result = build_unary_op (Present (Next_Entity (gnat_field))
- ? REALPART_EXPR : IMAGPART_EXPR,
- NULL_TREE, gnu_prefix);
- else
- {
- gnu_field = gnat_to_gnu_entity (gnat_field, NULL_TREE, 0);
-
- /* If there are discriminants, the prefix might be
- evaluated more than once, which is a problem if it has
- side-effects. */
-
- if (Has_Discriminants (Is_Access_Type (Etype (Prefix (gnat_node)))
- ? Designated_Type (Etype
- (Prefix (gnat_node)))
- : Etype (Prefix (gnat_node)))
- && TREE_SIDE_EFFECTS (gnu_prefix))
- gnu_prefix = make_save_expr (gnu_prefix);
-
- /* Emit discriminant check if necessary. */
- if (Do_Discriminant_Check (gnat_node))
- gnu_prefix = emit_discriminant_check (gnu_prefix, gnat_node);
- gnu_result
- = build_component_ref (gnu_prefix, NULL_TREE, gnu_field);
- }
-
- if (gnu_result == 0)
- gigi_abort (308);
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- }
- break;
-
- case N_Attribute_Reference:
- {
- /* The attribute designator (like an enumeration value). */
- int attribute = Get_Attribute_Id (Attribute_Name (gnat_node));
- int prefix_unused = 0;
- tree gnu_prefix;
- tree gnu_type;
-
- /* The Elab_Spec and Elab_Body attributes are special in that
- Prefix is a unit, not an object with a GCC equivalent. Similarly
- for Elaborated, since that variable isn't otherwise known. */
- if (attribute == Attr_Elab_Body || attribute == Attr_Elab_Spec)
- {
- gnu_prefix
- = create_subprog_decl
- (create_concat_name (Entity (Prefix (gnat_node)),
- attribute == Attr_Elab_Body
- ? "elabb" : "elabs"),
- NULL_TREE, void_ftype, NULL_TREE, 0, 1, 1, 0);
- return gnu_prefix;
- }
-
- gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
- gnu_type = TREE_TYPE (gnu_prefix);
-
- /* If the input is a NULL_EXPR, make a new one. */
- if (TREE_CODE (gnu_prefix) == NULL_EXPR)
- {
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build1 (NULL_EXPR, gnu_result_type,
- TREE_OPERAND (gnu_prefix, 0));
- break;
- }
-
- switch (attribute)
- {
- case Attr_Pos:
- case Attr_Val:
- /* These are just conversions until since representation
- clauses for enumerations are handled in the front end. */
- {
- int check_p = Do_Range_Check (First (Expressions (gnat_node)));
-
- gnu_result = gnat_to_gnu (First (Expressions (gnat_node)));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = convert_with_check (Etype (gnat_node), gnu_result,
- check_p, check_p, 1);
- }
- break;
-
- case Attr_Pred:
- case Attr_Succ:
- /* These just add or subject the constant 1. Representation
- clauses for enumerations are handled in the front-end. */
- gnu_expr = gnat_to_gnu (First (Expressions (gnat_node)));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (Do_Range_Check (First (Expressions (gnat_node))))
- {
- gnu_expr = make_save_expr (gnu_expr);
- gnu_expr
- = emit_check
- (build_binary_op (EQ_EXPR, integer_type_node,
- gnu_expr,
- attribute == Attr_Pred
- ? TYPE_MIN_VALUE (gnu_result_type)
- : TYPE_MAX_VALUE (gnu_result_type)),
- gnu_expr);
- }
-
- gnu_result
- = build_binary_op (attribute == Attr_Pred
- ? MINUS_EXPR : PLUS_EXPR,
- gnu_result_type, gnu_expr,
- convert (gnu_result_type, integer_one_node));
- break;
-
- case Attr_Address:
- case Attr_Unrestricted_Access:
-
- /* Conversions don't change something's address but can cause
- us to miss the COMPONENT_REF case below, so strip them off. */
- gnu_prefix = remove_conversions (gnu_prefix);
-
- /* If we are taking 'Address of an unconstrained object,
- this is the pointer to the underlying array. */
- gnu_prefix = maybe_unconstrained_array (gnu_prefix);
-
- /* ... fall through ... */
-
- case Attr_Access:
- case Attr_Unchecked_Access:
- case Attr_Code_Address:
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result
- = build_unary_op (attribute == Attr_Address
- || attribute == Attr_Unrestricted_Access
- ? ATTR_ADDR_EXPR : ADDR_EXPR,
- gnu_result_type, gnu_prefix);
-
- /* For 'Code_Address, find an inner ADDR_EXPR and mark it
- so that we don't try to build a trampoline. */
- if (attribute == Attr_Code_Address)
- {
- for (gnu_expr = gnu_result;
- TREE_CODE (gnu_expr) == NOP_EXPR
- || TREE_CODE (gnu_expr) == CONVERT_EXPR;
- gnu_expr = TREE_OPERAND (gnu_expr, 0))
- TREE_CONSTANT (gnu_expr) = 1;
- ;
-
- if (TREE_CODE (gnu_expr) == ADDR_EXPR)
- TREE_STATIC (gnu_expr) = TREE_CONSTANT (gnu_expr) = 1;
- }
-
- break;
-
- case Attr_Size:
- case Attr_Object_Size:
- case Attr_Value_Size:
- case Attr_Max_Size_In_Storage_Elements:
-
- gnu_expr = gnu_prefix;
-
- /* Remove NOPS from gnu_expr and conversions from gnu_prefix.
- We only use GNU_EXPR to see if a COMPONENT_REF was involved. */
- while (TREE_CODE (gnu_expr) == NOP_EXPR)
- gnu_expr = TREE_OPERAND (gnu_expr, 0);
-
- gnu_prefix = remove_conversions (gnu_prefix);
- prefix_unused = 1;
- gnu_type = TREE_TYPE (gnu_prefix);
-
- /* Replace an unconstrained array type with the type of the
- underlying array. We can't do this with a call to
- maybe_unconstrained_array since we may have a TYPE_DECL.
- For 'Max_Size_In_Storage_Elements, use the record type
- that will be used to allocate the object and its template. */
-
- if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
- {
- gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type);
- if (attribute != Attr_Max_Size_In_Storage_Elements)
- gnu_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
- }
-
- /* If we are looking for the size of a field, return the
- field size. Otherwise, if the prefix is an object,
- or if 'Object_Size or 'Max_Size_In_Storage_Elements has
- been specified, the result is the GCC size of the type.
- Otherwise, the result is the RM_Size of the type. */
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
- gnu_result = DECL_SIZE (TREE_OPERAND (gnu_prefix, 1));
- else if (TREE_CODE (gnu_prefix) != TYPE_DECL
- || attribute == Attr_Object_Size
- || attribute == Attr_Max_Size_In_Storage_Elements)
- {
- /* If this is a padded type, the GCC size isn't relevant
- to the programmer. Normally, what we want is the RM_Size,
- which was set from the specified size, but if it was not
- set, we want the size of the relevant field. Using the MAX
- of those two produces the right result in all case. Don't
- use the size of the field if it's a self-referential type,
- since that's never what's wanted. */
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_type)
- && TREE_CODE (gnu_expr) == COMPONENT_REF)
- {
- gnu_result = rm_size (gnu_type);
- if (! (contains_placeholder_p
- (DECL_SIZE (TREE_OPERAND (gnu_expr, 1)))))
- gnu_result
- = size_binop (MAX_EXPR, gnu_result,
- DECL_SIZE (TREE_OPERAND (gnu_expr, 1)));
- }
- else
- gnu_result = TYPE_SIZE (gnu_type);
- }
- else
- gnu_result = rm_size (gnu_type);
-
- if (gnu_result == 0)
- gigi_abort (325);
-
- /* Deal with a self-referential size by returning the maximum
- size for a type and by qualifying the size with
- the object for 'Size of an object. */
-
- if (TREE_CODE (gnu_result) != INTEGER_CST
- && contains_placeholder_p (gnu_result))
- {
- if (TREE_CODE (gnu_prefix) != TYPE_DECL)
- gnu_result = build (WITH_RECORD_EXPR, TREE_TYPE (gnu_result),
- gnu_result, gnu_prefix);
- else
- gnu_result = max_size (gnu_result, 1);
- }
-
- /* If the type contains a template, subtract the size of the
- template. */
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
- gnu_result = size_binop (MINUS_EXPR, gnu_result,
- DECL_SIZE (TYPE_FIELDS (gnu_type)));
-
- /* If the type contains a template, subtract the size of the
- template. */
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
- gnu_result = size_binop (MINUS_EXPR, gnu_result,
- DECL_SIZE (TYPE_FIELDS (gnu_type)));
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* Always perform division using unsigned arithmetic as the
- size cannot be negative, but may be an overflowed positive
- value. This provides correct results for sizes up to 512 MB.
- ??? Size should be calculated in storage elements directly. */
-
- if (attribute == Attr_Max_Size_In_Storage_Elements)
- gnu_result = convert (sizetype,
- fold (build (CEIL_DIV_EXPR, bitsizetype,
- gnu_result,
- bitsize_unit_node)));
- break;
-
- case Attr_Alignment:
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF
- && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
- == RECORD_TYPE)
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
- gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
-
- gnu_type = TREE_TYPE (gnu_prefix);
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- prefix_unused = 1;
-
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
- gnu_result
- = size_int (DECL_ALIGN (TREE_OPERAND (gnu_prefix, 1)));
- else
- gnu_result = size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT);
- break;
-
- case Attr_First:
- case Attr_Last:
- case Attr_Range_Length:
- prefix_unused = 1;
-
- if (INTEGRAL_TYPE_P (gnu_type)
- || TREE_CODE (gnu_type) == REAL_TYPE)
- {
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (attribute == Attr_First)
- gnu_result = TYPE_MIN_VALUE (gnu_type);
- else if (attribute == Attr_Last)
- gnu_result = TYPE_MAX_VALUE (gnu_type);
- else
- gnu_result
- = build_binary_op
- (MAX_EXPR, get_base_type (gnu_result_type),
- build_binary_op
- (PLUS_EXPR, get_base_type (gnu_result_type),
- build_binary_op (MINUS_EXPR,
- get_base_type (gnu_result_type),
- convert (gnu_result_type,
- TYPE_MAX_VALUE (gnu_type)),
- convert (gnu_result_type,
- TYPE_MIN_VALUE (gnu_type))),
- convert (gnu_result_type, integer_one_node)),
- convert (gnu_result_type, integer_zero_node));
-
- break;
- }
- /* ... fall through ... */
- case Attr_Length:
- {
- int Dimension
- = (Present (Expressions (gnat_node))
- ? UI_To_Int (Intval (First (Expressions (gnat_node))))
- : 1);
-
- /* Emit access check if necessary */
- if (Do_Access_Check (gnat_node))
- gnu_prefix = emit_access_check (gnu_prefix);
-
- /* Make sure any implicit dereference gets done. */
- gnu_prefix = maybe_implicit_deref (gnu_prefix);
- gnu_prefix = maybe_unconstrained_array (gnu_prefix);
- gnu_type = TREE_TYPE (gnu_prefix);
- prefix_unused = 1;
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (TYPE_CONVENTION_FORTRAN_P (gnu_type))
- {
- int ndim;
- tree gnu_type_temp;
-
- for (ndim = 1, gnu_type_temp = gnu_type;
- TREE_CODE (TREE_TYPE (gnu_type_temp)) == ARRAY_TYPE
- && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp));
- ndim++, gnu_type_temp = TREE_TYPE (gnu_type_temp))
- ;
-
- Dimension = ndim + 1 - Dimension;
- }
-
- for (; Dimension > 1; Dimension--)
- gnu_type = TREE_TYPE (gnu_type);
-
- if (TREE_CODE (gnu_type) != ARRAY_TYPE)
- gigi_abort (309);
-
- if (attribute == Attr_First)
- gnu_result
- = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
- else if (attribute == Attr_Last)
- gnu_result
- = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
- else
- /* 'Length or 'Range_Length. */
- {
- tree gnu_compute_type
- = signed_or_unsigned_type
- (0, get_base_type (gnu_result_type));
-
- gnu_result
- = build_binary_op
- (MAX_EXPR, gnu_compute_type,
- build_binary_op
- (PLUS_EXPR, gnu_compute_type,
- build_binary_op
- (MINUS_EXPR, gnu_compute_type,
- convert (gnu_compute_type,
- TYPE_MAX_VALUE
- (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)))),
- convert (gnu_compute_type,
- TYPE_MIN_VALUE
- (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))))),
- convert (gnu_compute_type, integer_one_node)),
- convert (gnu_compute_type, integer_zero_node));
- }
-
- /* If this has a PLACEHOLDER_EXPR, qualify it by the object
- we are handling. Note that these attributes could not
- have been used on an unconstrained array type. */
- if (TREE_CODE (gnu_result) != INTEGER_CST
- && contains_placeholder_p (gnu_result))
- gnu_result = build (WITH_RECORD_EXPR, TREE_TYPE (gnu_result),
- gnu_result, gnu_prefix);
-
- break;
- }
-
- case Attr_Bit_Position:
- case Attr_Position:
- case Attr_First_Bit:
- case Attr_Last_Bit:
- case Attr_Bit:
- {
- HOST_WIDE_INT bitsize;
- HOST_WIDE_INT bitpos;
- tree gnu_offset;
- tree gnu_field_bitpos;
- tree gnu_field_offset;
- tree gnu_inner;
- enum machine_mode mode;
- int unsignedp, volatilep;
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_prefix = remove_conversions (gnu_prefix);
- prefix_unused = 1;
-
- /* We can have 'Bit on any object, but if it isn't a
- COMPONENT_REF, the result is zero. Do not allow
- 'Bit on a bare component, though. */
- if (attribute == Attr_Bit
- && TREE_CODE (gnu_prefix) != COMPONENT_REF
- && TREE_CODE (gnu_prefix) != FIELD_DECL)
- {
- gnu_result = integer_zero_node;
- break;
- }
-
- else if (TREE_CODE (gnu_prefix) != COMPONENT_REF
- && ! (attribute == Attr_Bit_Position
- && TREE_CODE (gnu_prefix) == FIELD_DECL))
- gigi_abort (310);
-
- get_inner_reference (gnu_prefix, &bitsize, &bitpos, &gnu_offset,
- &mode, &unsignedp, &volatilep);
-
-
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
- {
- gnu_field_bitpos
- = bit_position (TREE_OPERAND (gnu_prefix, 1));
- gnu_field_offset
- = byte_position (TREE_OPERAND (gnu_prefix, 1));
-
- for (gnu_inner = TREE_OPERAND (gnu_prefix, 0);
- TREE_CODE (gnu_inner) == COMPONENT_REF
- && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner, 1));
- gnu_inner = TREE_OPERAND (gnu_inner, 0))
- {
- gnu_field_bitpos
- = size_binop (PLUS_EXPR, gnu_field_bitpos,
- bit_position (TREE_OPERAND (gnu_inner,
- 1)));
- gnu_field_offset
- = size_binop (PLUS_EXPR, gnu_field_offset,
- byte_position (TREE_OPERAND (gnu_inner,
- 1)));
- }
- }
- else if (TREE_CODE (gnu_prefix) == FIELD_DECL)
- {
- gnu_field_bitpos = bit_position (gnu_prefix);
- gnu_field_offset = byte_position (gnu_prefix);
- }
- else
- {
- gnu_field_bitpos = bitsize_zero_node;
- gnu_field_offset = size_zero_node;
- }
-
- switch (attribute)
- {
- case Attr_Position:
- gnu_result = gnu_field_offset;
- break;
-
-
- case Attr_First_Bit:
- case Attr_Bit:
- gnu_result = size_int (bitpos % BITS_PER_UNIT);
- break;
-
-
- case Attr_Last_Bit:
- gnu_result = bitsize_int (bitpos % BITS_PER_UNIT);
- gnu_result
- = size_binop (PLUS_EXPR, gnu_result,
- TYPE_SIZE (TREE_TYPE (gnu_prefix)));
- gnu_result = size_binop (MINUS_EXPR, gnu_result,
- bitsize_one_node);
- break;
-
- case Attr_Bit_Position:
- gnu_result = gnu_field_bitpos;
- break;
- }
-
- /* If this has a PLACEHOLDER_EXPR, qualify it by the object
- we are handling. */
- if (TREE_CODE (gnu_result) != INTEGER_CST
- && contains_placeholder_p (gnu_result))
- gnu_result = build (WITH_RECORD_EXPR, TREE_TYPE (gnu_result),
- gnu_result, gnu_prefix);
-
- break;
- }
-
- case Attr_Min:
- case Attr_Max:
- gnu_lhs = gnat_to_gnu (First (Expressions (gnat_node)));
- gnu_rhs = gnat_to_gnu (Next (First (Expressions (gnat_node))));
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build_binary_op (attribute == Attr_Min
- ? MIN_EXPR : MAX_EXPR,
- gnu_result_type, gnu_lhs, gnu_rhs);
- break;
-
- case Attr_Passed_By_Reference:
- gnu_result = size_int (default_pass_by_ref (gnu_type)
- || must_pass_by_ref (gnu_type));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- break;
-
- case Attr_Component_Size:
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF
- && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
- == RECORD_TYPE)
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
- gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
-
- gnu_prefix = maybe_implicit_deref (gnu_prefix);
- gnu_type = TREE_TYPE (gnu_prefix);
-
- if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
- gnu_type
- = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type))));
-
- while (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
- && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
- gnu_type = TREE_TYPE (gnu_type);
-
- if (TREE_CODE (gnu_type) != ARRAY_TYPE)
- gigi_abort (330);
-
- /* Note this size cannot be self-referential. */
- gnu_result = TYPE_SIZE (TREE_TYPE (gnu_type));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- prefix_unused = 1;
- break;
-
- case Attr_Null_Parameter:
- /* This is just a zero cast to the pointer type for
- our prefix and dereferenced. */
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result
- = build_unary_op (INDIRECT_REF, NULL_TREE,
- convert (build_pointer_type (gnu_result_type),
- integer_zero_node));
- TREE_PRIVATE (gnu_result) = 1;
- break;
-
- case Attr_Mechanism_Code:
- {
- int code;
- Entity_Id gnat_obj = Entity (Prefix (gnat_node));
-
- prefix_unused = 1;
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- if (Present (Expressions (gnat_node)))
- {
- int i = UI_To_Int (Intval (First (Expressions (gnat_node))));
-
- for (gnat_obj = First_Formal (gnat_obj); i > 1;
- i--, gnat_obj = Next_Formal (gnat_obj))
- ;
- }
-
- code = Mechanism (gnat_obj);
- if (code == Default)
- code = ((present_gnu_tree (gnat_obj)
- && (DECL_BY_REF_P (get_gnu_tree (gnat_obj))
- || (DECL_BY_COMPONENT_PTR_P
- (get_gnu_tree (gnat_obj)))))
- ? By_Reference : By_Copy);
- gnu_result = convert (gnu_result_type, size_int (- code));
- }
- break;
-
- default:
- /* Say we have an unimplemented attribute. Then set the
- value to be returned to be a zero and hope that's something
- we can convert to the type of this attribute. */
-
- post_error ("unimplemented attribute", gnat_node);
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = integer_zero_node;
- break;
- }
-
- /* If this is an attribute where the prefix was unused,
- force a use of it if it has a side-effect. */
- if (prefix_unused && TREE_SIDE_EFFECTS (gnu_prefix))
- gnu_result = fold (build (COMPOUND_EXPR, TREE_TYPE (gnu_result),
- gnu_prefix, gnu_result));
- }
- break;
-
- case N_Reference:
- /* Like 'Access as far as we are concerned. */
- gnu_result = gnat_to_gnu (Prefix (gnat_node));
- gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_result);
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- break;
-
- case N_Aggregate:
- case N_Extension_Aggregate:
- {
- tree gnu_aggr_type;
-
- /* ??? It is wrong to evaluate the type now, but there doesn't
- seem to be any other practical way of doing it. */
-
- gnu_aggr_type = gnu_result_type
- = get_unpadded_type (Etype (gnat_node));
-
- if (TREE_CODE (gnu_result_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_result_type))
- gnu_aggr_type
- = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_result_type)));
-
- if (Null_Record_Present (gnat_node))
- gnu_result = build_constructor (gnu_aggr_type, NULL_TREE);
-
- else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE)
- gnu_result
- = assoc_to_constructor (First (Component_Associations (gnat_node)),
- gnu_aggr_type);
- else if (TREE_CODE (gnu_aggr_type) == UNION_TYPE)
- {
- /* The first element is the discrimant, which we ignore. The
- next is the field we're building. Convert the expression
- to the type of the field and then to the union type. */
- Node_Id gnat_assoc
- = Next (First (Component_Associations (gnat_node)));
- Entity_Id gnat_field = Entity (First (Choices (gnat_assoc)));
- tree gnu_field_type
- = TREE_TYPE (gnat_to_gnu_entity (gnat_field, NULL_TREE, 0));
-
- gnu_result = convert (gnu_field_type,
- gnat_to_gnu (Expression (gnat_assoc)));
- }
- else if (TREE_CODE (gnu_aggr_type) == ARRAY_TYPE)
- gnu_result = pos_to_constructor (First (Expressions (gnat_node)),
- gnu_aggr_type,
- Component_Type (Etype (gnat_node)));
- else if (TREE_CODE (gnu_aggr_type) == COMPLEX_TYPE)
- gnu_result
- = build_binary_op
- (COMPLEX_EXPR, gnu_aggr_type,
- gnat_to_gnu (Expression (First
- (Component_Associations (gnat_node)))),
- gnat_to_gnu (Expression
- (Next
- (First (Component_Associations (gnat_node))))));
- else
- gigi_abort (312);
-
- gnu_result = convert (gnu_result_type, gnu_result);
- }
- break;
-
- case N_Null:
- gnu_result = null_pointer_node;
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- break;
-
- case N_Type_Conversion:
- case N_Qualified_Expression:
- /* Get the operand expression. */
- gnu_result = gnat_to_gnu (Expression (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- gnu_result
- = convert_with_check (Etype (gnat_node), gnu_result,
- Do_Overflow_Check (gnat_node),
- Do_Range_Check (Expression (gnat_node)),
- Nkind (gnat_node) == N_Type_Conversion
- && Float_Truncate (gnat_node));
- break;
-
- case N_Unchecked_Type_Conversion:
- gnu_result = gnat_to_gnu (Expression (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* If the result is a pointer type, see if we are improperly
- converting to a stricter alignment. */
-
- if (STRICT_ALIGNMENT && POINTER_TYPE_P (gnu_result_type)
- && IN (Ekind (Etype (gnat_node)), Access_Kind))
- {
- unsigned int align = known_alignment (gnu_result);
- tree gnu_obj_type = TREE_TYPE (gnu_result_type);
- unsigned int oalign
- = TREE_CODE (gnu_obj_type) == FUNCTION_TYPE
- ? FUNCTION_BOUNDARY : TYPE_ALIGN (gnu_obj_type);
-
- if (align != 0 && align < oalign && ! TYPE_ALIGN_OK_P (gnu_obj_type))
- post_error_ne_tree_2
- ("?source alignment (^) < alignment of & (^)",
- gnat_node, Designated_Type (Etype (gnat_node)),
- size_int (align / BITS_PER_UNIT), oalign / BITS_PER_UNIT);
- }
-
- gnu_result = unchecked_convert (gnu_result_type, gnu_result);
- break;
-
- case N_In:
- case N_Not_In:
- {
- tree gnu_object = gnat_to_gnu (Left_Opnd (gnat_node));
- Node_Id gnat_range = Right_Opnd (gnat_node);
- tree gnu_low;
- tree gnu_high;
-
- /* GNAT_RANGE is either an N_Range node or an identifier
- denoting a subtype. */
- if (Nkind (gnat_range) == N_Range)
- {
- gnu_low = gnat_to_gnu (Low_Bound (gnat_range));
- gnu_high = gnat_to_gnu (High_Bound (gnat_range));
- }
- else if (Nkind (gnat_range) == N_Identifier
- || Nkind (gnat_range) == N_Expanded_Name)
- {
- tree gnu_range_type = get_unpadded_type (Entity (gnat_range));
-
- gnu_low = TYPE_MIN_VALUE (gnu_range_type);
- gnu_high = TYPE_MAX_VALUE (gnu_range_type);
- }
- else
- gigi_abort (313);
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* If LOW and HIGH are identical, perform an equality test.
- Otherwise, ensure that GNU_OBJECT is only evaluated once
- and perform a full range test. */
- if (operand_equal_p (gnu_low, gnu_high, 0))
- gnu_result = build_binary_op (EQ_EXPR, gnu_result_type,
- gnu_object, gnu_low);
- else
- {
- gnu_object = make_save_expr (gnu_object);
- gnu_result
- = build_binary_op (TRUTH_ANDIF_EXPR, gnu_result_type,
- build_binary_op (GE_EXPR, gnu_result_type,
- gnu_object, gnu_low),
- build_binary_op (LE_EXPR, gnu_result_type,
- gnu_object, gnu_high));
- }
-
- if (Nkind (gnat_node) == N_Not_In)
- gnu_result = invert_truthvalue (gnu_result);
- }
- break;
-
- case N_Op_Divide:
- gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
- gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build_binary_op (FLOAT_TYPE_P (gnu_result_type)
- ? RDIV_EXPR
- : (Rounded_Result (gnat_node)
- ? ROUND_DIV_EXPR : TRUNC_DIV_EXPR),
- gnu_result_type, gnu_lhs, gnu_rhs);
- break;
-
- case N_And_Then: case N_Or_Else:
- {
- enum tree_code code = gnu_codes[Nkind (gnat_node)];
- tree gnu_rhs_side;
-
- /* The elaboration of the RHS may generate code. If so,
- we need to make sure it gets executed after the LHS. */
- gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
- clear_last_expr ();
- gnu_rhs_side = expand_start_stmt_expr (/*has_scope=*/1);
- gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
- expand_end_stmt_expr (gnu_rhs_side);
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (RTL_EXPR_SEQUENCE (gnu_rhs_side) != 0)
- gnu_rhs = build (COMPOUND_EXPR, gnu_result_type, gnu_rhs_side,
- gnu_rhs);
-
- gnu_result = build_binary_op (code, gnu_result_type, gnu_lhs, gnu_rhs);
- }
- break;
-
- case N_Op_Or: case N_Op_And: case N_Op_Xor:
- /* These can either be operations on booleans or on modular types.
- Fall through for boolean types since that's the way GNU_CODES is
- set up. */
- if (IN (Ekind (Underlying_Type (Etype (gnat_node))),
- Modular_Integer_Kind))
- {
- enum tree_code code
- = (Nkind (gnat_node) == N_Op_Or ? BIT_IOR_EXPR
- : Nkind (gnat_node) == N_Op_And ? BIT_AND_EXPR
- : BIT_XOR_EXPR);
-
- gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
- gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build_binary_op (code, gnu_result_type,
- gnu_lhs, gnu_rhs);
- break;
- }
-
- /* ... fall through ... */
-
- case N_Op_Eq: case N_Op_Ne: case N_Op_Lt:
- case N_Op_Le: case N_Op_Gt: case N_Op_Ge:
- case N_Op_Add: case N_Op_Subtract: case N_Op_Multiply:
- case N_Op_Mod: case N_Op_Rem:
- case N_Op_Rotate_Left:
- case N_Op_Rotate_Right:
- case N_Op_Shift_Left:
- case N_Op_Shift_Right:
- case N_Op_Shift_Right_Arithmetic:
- {
- enum tree_code code = gnu_codes[Nkind (gnat_node)];
- tree gnu_type;
-
- gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
- gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
- gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* If this is a comparison operator, convert any references to
- an unconstrained array value into a reference to the
- actual array. */
- if (TREE_CODE_CLASS (code) == '<')
- {
- gnu_lhs = maybe_unconstrained_array (gnu_lhs);
- gnu_rhs = maybe_unconstrained_array (gnu_rhs);
- }
-
- /* If the result type is a private type, its full view may be a
- numeric subtype. The representation we need is that of its base
- type, given that it is the result of an arithmetic operation. */
- else if (Is_Private_Type (Etype (gnat_node)))
- gnu_type = gnu_result_type
- = get_unpadded_type (Base_Type (Full_View (Etype (gnat_node))));
-
- /* If this is a shift whose count is not guaranteed to be correct,
- we need to adjust the shift count. */
- if (IN (Nkind (gnat_node), N_Op_Shift)
- && ! Shift_Count_OK (gnat_node))
- {
- tree gnu_count_type = get_base_type (TREE_TYPE (gnu_rhs));
- tree gnu_max_shift
- = convert (gnu_count_type, TYPE_SIZE (gnu_type));
-
- if (Nkind (gnat_node) == N_Op_Rotate_Left
- || Nkind (gnat_node) == N_Op_Rotate_Right)
- gnu_rhs = build_binary_op (TRUNC_MOD_EXPR, gnu_count_type,
- gnu_rhs, gnu_max_shift);
- else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic)
- gnu_rhs
- = build_binary_op
- (MIN_EXPR, gnu_count_type,
- build_binary_op (MINUS_EXPR,
- gnu_count_type,
- gnu_max_shift,
- convert (gnu_count_type,
- integer_one_node)),
- gnu_rhs);
- }
-
- /* For right shifts, the type says what kind of shift to do,
- so we may need to choose a different type. */
- if (Nkind (gnat_node) == N_Op_Shift_Right
- && ! TREE_UNSIGNED (gnu_type))
- gnu_type = unsigned_type (gnu_type);
- else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic
- && TREE_UNSIGNED (gnu_type))
- gnu_type = signed_type (gnu_type);
-
- if (gnu_type != gnu_result_type)
- {
- gnu_lhs = convert (gnu_type, gnu_lhs);
- gnu_rhs = convert (gnu_type, gnu_rhs);
- }
-
- gnu_result = build_binary_op (code, gnu_type, gnu_lhs, gnu_rhs);
-
- /* If this is a logical shift with the shift count not verified,
- we must return zero if it is too large. We cannot compensate
- above in this case. */
- if ((Nkind (gnat_node) == N_Op_Shift_Left
- || Nkind (gnat_node) == N_Op_Shift_Right)
- && ! Shift_Count_OK (gnat_node))
- gnu_result
- = build_cond_expr
- (gnu_type,
- build_binary_op (GE_EXPR, integer_type_node,
- gnu_rhs,
- convert (TREE_TYPE (gnu_rhs),
- TYPE_SIZE (gnu_type))),
- convert (gnu_type, integer_zero_node),
- gnu_result);
- }
- break;
-
- case N_Conditional_Expression:
- {
- tree gnu_cond = gnat_to_gnu (First (Expressions (gnat_node)));
- tree gnu_true = gnat_to_gnu (Next (First (Expressions (gnat_node))));
- tree gnu_false
- = gnat_to_gnu (Next (Next (First (Expressions (gnat_node)))));
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build_cond_expr (gnu_result_type,
- truthvalue_conversion (gnu_cond),
- gnu_true, gnu_false);
- }
- break;
-
- case N_Op_Plus:
- gnu_result = gnat_to_gnu (Right_Opnd (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- break;
-
- case N_Op_Not:
- /* This case can apply to a boolean or a modular type.
- Fall through for a boolean operand since GNU_CODES is set
- up to handle this. */
- if (IN (Ekind (Etype (gnat_node)), Modular_Integer_Kind))
- {
- gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build_unary_op (BIT_NOT_EXPR, gnu_result_type,
- gnu_expr);
- break;
- }
-
- /* ... fall through ... */
-
- case N_Op_Minus: case N_Op_Abs:
- gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
-
- if (Ekind (Etype (gnat_node)) != E_Private_Type)
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- else
- gnu_result_type = get_unpadded_type (Base_Type
- (Full_View (Etype (gnat_node))));
-
- gnu_result = build_unary_op (gnu_codes[Nkind (gnat_node)],
- gnu_result_type, gnu_expr);
- break;
-
- case N_Allocator:
- {
- tree gnu_init = 0;
- tree gnu_type;
-
- gnat_temp = Expression (gnat_node);
-
- /* The Expression operand can either be an N_Identifier or
- Expanded_Name, which must represent a type, or a
- N_Qualified_Expression, which contains both the object type and an
- initial value for the object. */
- if (Nkind (gnat_temp) == N_Identifier
- || Nkind (gnat_temp) == N_Expanded_Name)
- gnu_type = gnat_to_gnu_type (Entity (gnat_temp));
- else if (Nkind (gnat_temp) == N_Qualified_Expression)
- {
- Entity_Id gnat_desig_type
- = Designated_Type (Underlying_Type (Etype (gnat_node)));
-
- gnu_init = gnat_to_gnu (Expression (gnat_temp));
-
- gnu_init = maybe_unconstrained_array (gnu_init);
- if (Do_Range_Check (Expression (gnat_temp)))
- gnu_init = emit_range_check (gnu_init, gnat_desig_type);
-
- if (Is_Elementary_Type (gnat_desig_type)
- || Is_Constrained (gnat_desig_type))
- {
- gnu_type = gnat_to_gnu_type (gnat_desig_type);
- gnu_init = convert (gnu_type, gnu_init);
- }
- else
- {
- gnu_type = gnat_to_gnu_type (Etype (Expression (gnat_temp)));
- if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
- gnu_type = TREE_TYPE (gnu_init);
-
- gnu_init = convert (gnu_type, gnu_init);
- }
- }
- else
- gigi_abort (315);
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- return build_allocator (gnu_type, gnu_init, gnu_result_type,
- Procedure_To_Call (gnat_node),
- Storage_Pool (gnat_node));
- }
- break;
-
- /***************************/
- /* Chapter 5: Statements: */
- /***************************/
-
- case N_Label:
- if (! type_annotate_only)
- {
- tree gnu_label = gnat_to_gnu (Identifier (gnat_node));
- Node_Id gnat_parent = Parent (gnat_node);
-
- expand_label (gnu_label);
-
- /* If this is the first label of an exception handler, we must
- mark that any CALL_INSN can jump to it. */
- if (Present (gnat_parent)
- && Nkind (gnat_parent) == N_Exception_Handler
- && First (Statements (gnat_parent)) == gnat_node)
- nonlocal_goto_handler_labels
- = gen_rtx_EXPR_LIST (VOIDmode, label_rtx (gnu_label),
- nonlocal_goto_handler_labels);
- }
- break;
-
- case N_Null_Statement:
- break;
-
- case N_Assignment_Statement:
- if (type_annotate_only)
- break;
-
- /* Get the LHS and RHS of the statement and convert any reference to an
- unconstrained array into a reference to the underlying array. */
- gnu_lhs = maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node)));
- gnu_rhs
- = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node)));
-
- set_lineno (gnat_node, 1);
-
- /* If range check is needed, emit code to generate it */
- if (Do_Range_Check (Expression (gnat_node)))
- gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node)));
-
- /* If either side's type has a size that overflows, convert this
- into raise of Storage_Error: execution shouldn't have gotten
- here anyway. */
- if ((TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_lhs))) == INTEGER_CST
- && TREE_OVERFLOW (TYPE_SIZE (TREE_TYPE (gnu_lhs))))
- || (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_rhs))) == INTEGER_CST
- && TREE_OVERFLOW (TYPE_SIZE (TREE_TYPE (gnu_rhs)))))
- expand_expr_stmt (build_call_raise (raise_storage_error_decl));
- else
- expand_expr_stmt (build_binary_op (MODIFY_EXPR, NULL_TREE,
- gnu_lhs, gnu_rhs));
- break;
-
- case N_If_Statement:
- /* Start an IF statement giving the condition. */
- gnu_expr = gnat_to_gnu (Condition (gnat_node));
- set_lineno (gnat_node, 1);
- expand_start_cond (gnu_expr, 0);
-
- /* Generate code for the statements to be executed if the condition
- is true. */
-
- for (gnat_temp = First (Then_Statements (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next (gnat_temp))
- gnat_to_code (gnat_temp);
-
- /* Generate each of the "else if" parts. */
- if (Present (Elsif_Parts (gnat_node)))
- {
- for (gnat_temp = First (Elsif_Parts (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next (gnat_temp))
- {
- Node_Id gnat_statement;
-
- expand_start_else ();
-
- /* Set up the line numbers for each condition we test. */
- set_lineno (Condition (gnat_temp), 1);
- expand_elseif (gnat_to_gnu (Condition (gnat_temp)));
-
- for (gnat_statement = First (Then_Statements (gnat_temp));
- Present (gnat_statement);
- gnat_statement = Next (gnat_statement))
- gnat_to_code (gnat_statement);
- }
- }
-
- /* Finally, handle any statements in the "else" part. */
- if (Present (Else_Statements (gnat_node)))
- {
- expand_start_else ();
-
- for (gnat_temp = First (Else_Statements (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next (gnat_temp))
- gnat_to_code (gnat_temp);
- }
-
- expand_end_cond ();
- break;
-
- case N_Case_Statement:
- {
- Node_Id gnat_when;
- Node_Id gnat_choice;
- tree gnu_label;
- Node_Id gnat_statement;
-
- gnu_expr = gnat_to_gnu (Expression (gnat_node));
- gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
-
- set_lineno (gnat_node, 1);
- expand_start_case (1, gnu_expr, TREE_TYPE (gnu_expr), "case");
-
- for (gnat_when = First_Non_Pragma (Alternatives (gnat_node));
- Present (gnat_when);
- gnat_when = Next_Non_Pragma (gnat_when))
- {
- /* First compile all the different case choices for the current
- WHEN alternative. */
-
- for (gnat_choice = First (Discrete_Choices (gnat_when));
- Present (gnat_choice); gnat_choice = Next (gnat_choice))
- {
- int error_code;
-
- gnu_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
-
- set_lineno (gnat_choice, 1);
- switch (Nkind (gnat_choice))
- {
- case N_Range:
- /* Abort on all errors except range empty, which
- means we ignore this alternative. */
- error_code
- = pushcase_range (gnat_to_gnu (Low_Bound (gnat_choice)),
- gnat_to_gnu (High_Bound (gnat_choice)),
- convert, gnu_label, 0);
-
- if (error_code != 0 && error_code != 4)
- gigi_abort (332);
- break;
-
- case N_Subtype_Indication:
- error_code
- = pushcase_range
- (gnat_to_gnu (Low_Bound (Range_Expression
- (Constraint (gnat_choice)))),
- gnat_to_gnu (High_Bound (Range_Expression
- (Constraint (gnat_choice)))),
- convert, gnu_label, 0);
-
- if (error_code != 0 && error_code != 4)
- gigi_abort (332);
- break;
-
- case N_Identifier:
- case N_Expanded_Name:
- /* This represents either a subtype range or a static value
- of some kind; Ekind says which. If a static value,
- fall through to the next case. */
- if (IN (Ekind (Entity (gnat_choice)), Type_Kind))
- {
- tree type = get_unpadded_type (Entity (gnat_choice));
-
- error_code
- = pushcase_range (fold (TYPE_MIN_VALUE (type)),
- fold (TYPE_MAX_VALUE (type)),
- convert, gnu_label, 0);
-
- if (error_code != 0 && error_code != 4)
- gigi_abort (332);
- break;
- }
- /* ... fall through ... */
- case N_Character_Literal:
- case N_Integer_Literal:
- if (pushcase (gnat_to_gnu (gnat_choice), convert,
- gnu_label, 0))
- gigi_abort (332);
- break;
-
- case N_Others_Choice:
- if (pushcase (NULL_TREE, convert, gnu_label, 0))
- gigi_abort (332);
- break;
-
- default:
- gigi_abort (316);
- }
- }
-
- /* After compiling the choices attached to the WHEN compile the
- body of statements that have to be executed, should the
- "WHEN ... =>" be taken. */
- for (gnat_statement = First (Statements (gnat_when));
- Present (gnat_statement);
- gnat_statement = Next (gnat_statement))
- gnat_to_code (gnat_statement);
-
- /* Communicate to GCC that we are done with the current WHEN,
- i.e. insert a "break" statement. */
- expand_exit_something ();
- }
-
- expand_end_case (gnu_expr);
- }
- break;
-
- case N_Loop_Statement:
- {
- /* The loop variable in GCC form, if any. */
- tree gnu_loop_var = NULL_TREE;
- /* PREINCREMENT_EXPR or PREDECREMENT_EXPR. */
- enum tree_code gnu_update = ERROR_MARK;
- /* Used if this is a named loop for so EXIT can work. */
- struct nesting *loop_id;
- /* Condition to continue loop tested at top of loop. */
- tree gnu_top_condition = integer_one_node;
- /* Similar, but tested at bottom of loop. */
- tree gnu_bottom_condition = integer_one_node;
- Node_Id gnat_statement;
- Node_Id gnat_iter_scheme = Iteration_Scheme (gnat_node);
- Node_Id gnat_top_condition = Empty;
- int enclosing_if_p = 0;
-
- /* Set the condition that under which the loop should continue.
- For "LOOP .... END LOOP;" the condition is always true. */
- if (No (gnat_iter_scheme))
- ;
- /* The case "WHILE condition LOOP ..... END LOOP;" */
- else if (Present (Condition (gnat_iter_scheme)))
- gnat_top_condition = Condition (gnat_iter_scheme);
- else
- {
- /* We have an iteration scheme. */
- Node_Id gnat_loop_spec
- = Loop_Parameter_Specification (gnat_iter_scheme);
- Entity_Id gnat_loop_var = Defining_Entity (gnat_loop_spec);
- Entity_Id gnat_type = Etype (gnat_loop_var);
- tree gnu_type = get_unpadded_type (gnat_type);
- tree gnu_low = TYPE_MIN_VALUE (gnu_type);
- tree gnu_high = TYPE_MAX_VALUE (gnu_type);
- int reversep = Reverse_Present (gnat_loop_spec);
- tree gnu_first = reversep ? gnu_high : gnu_low;
- tree gnu_last = reversep ? gnu_low : gnu_high;
- enum tree_code end_code = reversep ? GE_EXPR : LE_EXPR;
- tree gnu_base_type = get_base_type (gnu_type);
- tree gnu_limit
- = (reversep ? TYPE_MIN_VALUE (gnu_base_type)
- : TYPE_MAX_VALUE (gnu_base_type));
-
- /* We know the loop variable will not overflow if GNU_LAST is
- a constant and is not equal to GNU_LIMIT. If it might
- overflow, we have to move the limit test to the end of
- the loop. In that case, we have to test for an
- empty loop outside the loop. */
- if (TREE_CODE (gnu_last) != INTEGER_CST
- || TREE_CODE (gnu_limit) != INTEGER_CST
- || tree_int_cst_equal (gnu_last, gnu_limit))
- {
- gnu_expr = build_binary_op (LE_EXPR, integer_type_node,
- gnu_low, gnu_high);
- set_lineno (gnat_loop_spec, 1);
- expand_start_cond (gnu_expr, 0);
- enclosing_if_p = 1;
- }
-
- /* Open a new nesting level that will surround the loop to declare
- the loop index variable. */
- pushlevel (0);
- expand_start_bindings (0);
-
- /* Declare the loop index and set it to its initial value. */
- gnu_loop_var = gnat_to_gnu_entity (gnat_loop_var, gnu_first, 1);
- if (DECL_BY_REF_P (gnu_loop_var))
- gnu_loop_var = build_unary_op (INDIRECT_REF, NULL_TREE,
- gnu_loop_var);
-
- /* The loop variable might be a padded type, so use `convert' to
- get a reference to the inner variable if so. */
- gnu_loop_var = convert (get_base_type (gnu_type), gnu_loop_var);
-
- /* Set either the top or bottom exit condition as
- appropriate depending on whether we know an overflow
- cannot occur or not. */
- if (enclosing_if_p)
- gnu_bottom_condition
- = build_binary_op (NE_EXPR, integer_type_node,
- gnu_loop_var, gnu_last);
- else
- gnu_top_condition
- = build_binary_op (end_code, integer_type_node,
- gnu_loop_var, gnu_last);
-
- gnu_update = reversep ? PREDECREMENT_EXPR : PREINCREMENT_EXPR;
- }
-
- set_lineno (gnat_node, 1);
- if (gnu_loop_var)
- loop_id = expand_start_loop_continue_elsewhere (1);
- else
- loop_id = expand_start_loop (1);
-
- /* If the loop was named, have the name point to this loop. In this
- case, the association is not a ..._DECL node; in fact, it isn't
- a GCC tree node at all. Since this name is referenced inside
- the loop, do it before we process the statements of the loop. */
- if (Present (Identifier (gnat_node)))
- {
- tree gnu_loop_id = make_node (GNAT_LOOP_ID);
-
- TREE_LOOP_ID (gnu_loop_id) = (rtx) loop_id;
- save_gnu_tree (Entity (Identifier (gnat_node)), gnu_loop_id, 1);
- }
-
- set_lineno (gnat_node, 1);
-
- /* We must evaluate the condition after we've entered the
- loop so that any expression actions get done in the right
- place. */
- if (Present (gnat_top_condition))
- gnu_top_condition = gnat_to_gnu (gnat_top_condition);
-
- expand_exit_loop_top_cond (0, gnu_top_condition);
-
- /* Make the loop body into its own block, so any allocated
- storage will be released every iteration. This is needed
- for stack allocation. */
-
- pushlevel (0);
- gnu_block_stack
- = tree_cons (gnu_bottom_condition, NULL_TREE, gnu_block_stack);
- expand_start_bindings (0);
-
- for (gnat_statement = First (Statements (gnat_node));
- Present (gnat_statement);
- gnat_statement = Next (gnat_statement))
- gnat_to_code (gnat_statement);
-
- expand_end_bindings (getdecls (), kept_level_p (), 0);
- poplevel (kept_level_p (), 1, 0);
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
-
- set_lineno (gnat_node, 1);
- expand_exit_loop_if_false (0, gnu_bottom_condition);
-
- if (gnu_loop_var)
- {
- expand_loop_continue_here ();
- gnu_expr = build_binary_op (gnu_update, TREE_TYPE (gnu_loop_var),
- gnu_loop_var,
- convert (TREE_TYPE (gnu_loop_var),
- integer_one_node));
- set_lineno (gnat_iter_scheme, 1);
- expand_expr_stmt (gnu_expr);
- }
-
- set_lineno (gnat_node, 1);
- expand_end_loop ();
-
- if (gnu_loop_var)
- {
- /* Close the nesting level that sourround the loop that was used to
- declare the loop index variable. */
- set_lineno (gnat_node, 1);
- expand_end_bindings (getdecls (), 1, 0);
- poplevel (1, 1, 0);
- }
-
- if (enclosing_if_p)
- {
- set_lineno (gnat_node, 1);
- expand_end_cond ();
- }
- }
- break;
-
- case N_Block_Statement:
- pushlevel (0);
- gnu_block_stack = tree_cons (NULL_TREE, NULL_TREE, gnu_block_stack);
- expand_start_bindings (0);
- process_decls (Declarations (gnat_node), Empty, Empty, 1, 1);
- gnat_to_code (Handled_Statement_Sequence (gnat_node));
- expand_end_bindings (getdecls (), kept_level_p (), 0);
- poplevel (kept_level_p (), 1, 0);
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
- if (Present (Identifier (gnat_node)))
- mark_out_of_scope (Entity (Identifier (gnat_node)));
- break;
-
- case N_Exit_Statement:
- {
- /* Which loop to exit, NULL if the current loop. */
- struct nesting *loop_id = 0;
- /* The GCC version of the optional GNAT condition node attached to the
- exit statement. Exit the loop if this is false. */
- tree gnu_cond = integer_zero_node;
-
- if (Present (Name (gnat_node)))
- loop_id
- = (struct nesting *)
- TREE_LOOP_ID (get_gnu_tree (Entity (Name (gnat_node))));
-
- if (Present (Condition (gnat_node)))
- gnu_cond
- = invert_truthvalue
- (truthvalue_conversion (gnat_to_gnu (Condition (gnat_node))));
-
- set_lineno (gnat_node, 1);
- expand_exit_loop_if_false (loop_id, gnu_cond);
- }
- break;
-
- case N_Return_Statement:
- if (type_annotate_only)
- break;
-
- {
- /* The gnu function type of the subprogram currently processed. */
- tree gnu_subprog_type = TREE_TYPE (current_function_decl);
- /* The return value from the subprogram. */
- tree gnu_ret_val = 0;
-
- /* If we are dealing with a "return;" from an Ada procedure with
- parameters passed by copy in copy out, we need to return a record
- containing the final values of these parameters. If the list
- contains only one entry, return just that entry.
-
- For a full description of the copy in copy out parameter mechanism,
- see the part of the gnat_to_gnu_entity routine dealing with the
- translation of subprograms.
-
- But if we have a return label defined, convert this into
- a branch to that label. */
-
- if (TREE_VALUE (gnu_return_label_stack) != 0)
- expand_goto (TREE_VALUE (gnu_return_label_stack));
-
- else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
- {
- if (list_length (TYPE_CI_CO_LIST (gnu_subprog_type)) == 1)
- gnu_ret_val = TREE_VALUE (TYPE_CI_CO_LIST (gnu_subprog_type));
- else
- gnu_ret_val
- = build_constructor (TREE_TYPE (gnu_subprog_type),
- TYPE_CI_CO_LIST (gnu_subprog_type));
- }
-
- /* If the Ada subprogram is a function, we just need to return the
- expression. If the subprogram returns an unconstrained
- array, we have to allocate a new version of the result and
- return it. If we return by reference, return a pointer. */
-
- else if (Present (Expression (gnat_node)))
- {
- gnu_ret_val = gnat_to_gnu (Expression (gnat_node));
-
- /* Do not remove the padding from GNU_RET_VAL if the inner
- type is self-referential since we want to allocate the fixed
- size in that case. */
- if (TREE_CODE (gnu_ret_val) == COMPONENT_REF
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0))))
- && contains_placeholder_p
- (TYPE_SIZE (TREE_TYPE (gnu_ret_val))))
- gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0);
-
- if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type)
- || By_Ref (gnat_node))
- gnu_ret_val = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val);
-
- else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type))
- {
- gnu_ret_val = maybe_unconstrained_array (gnu_ret_val);
-
- /* We have two cases: either the function returns with
- depressed stack or not. If not, we allocate on the
- secondary stack. If so, we allocate in the stack frame.
- if no copy is needed, the front end will set By_Ref,
- which we handle in the case above. */
- if (TYPE_RETURNS_STACK_DEPRESSED (gnu_subprog_type))
- gnu_ret_val
- = build_allocator (TREE_TYPE (gnu_ret_val), gnu_ret_val,
- TREE_TYPE (gnu_subprog_type), 0, -1);
- else
- gnu_ret_val
- = build_allocator (TREE_TYPE (gnu_ret_val), gnu_ret_val,
- TREE_TYPE (gnu_subprog_type),
- Procedure_To_Call (gnat_node),
- Storage_Pool (gnat_node));
- }
- }
-
- set_lineno (gnat_node, 1);
- if (gnu_ret_val)
- expand_return (build_binary_op (MODIFY_EXPR, NULL_TREE,
- DECL_RESULT (current_function_decl),
- gnu_ret_val));
- else
- expand_null_return ();
-
- }
- break;
-
- case N_Goto_Statement:
- if (type_annotate_only)
- break;
-
- gnu_expr = gnat_to_gnu (Name (gnat_node));
- TREE_USED (gnu_expr) = 1;
- set_lineno (gnat_node, 1);
- expand_goto (gnu_expr);
- break;
-
- /****************************/
- /* Chapter 6: Subprograms: */
- /****************************/
-
- case N_Subprogram_Declaration:
- /* Unless there is a freeze node, declare the subprogram. We consider
- this a "definition" even though we're not generating code for
- the subprogram because we will be making the corresponding GCC
- node here. */
-
- if (No (Freeze_Node (Defining_Entity (Specification (gnat_node)))))
- gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node)),
- NULL_TREE, 1);
-
- break;
-
- case N_Abstract_Subprogram_Declaration:
- /* This subprogram doesn't exist for code generation purposes, but we
- have to elaborate the types of any parameters, unless they are
- imported types (nothing to generate in this case). */
- for (gnat_temp
- = First_Formal (Defining_Entity (Specification (gnat_node)));
- Present (gnat_temp);
- gnat_temp = Next_Formal_With_Extras (gnat_temp))
- if (Is_Itype (Etype (gnat_temp))
- && !From_With_Type (Etype (gnat_temp)))
- gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
-
- break;
-
- case N_Defining_Program_Unit_Name:
- /* For a child unit identifier go up a level to get the
- specificaton. We get this when we try to find the spec of
- a child unit package that is the compilation unit being compiled. */
- gnat_to_code (Parent (gnat_node));
- break;
-
- case N_Subprogram_Body:
- {
- /* Save debug output mode in case it is reset. */
- enum debug_info_type save_write_symbols = write_symbols;
- struct gcc_debug_hooks *save_debug_hooks = debug_hooks;
- /* Definining identifier of a parameter to the subprogram. */
- Entity_Id gnat_param;
- /* The defining identifier for the subprogram body. Note that if a
- specification has appeared before for this body, then the identifier
- occurring in that specification will also be a defining identifier
- and all the calls to this subprogram will point to that
- specification. */
- Entity_Id gnat_subprog_id
- = (Present (Corresponding_Spec (gnat_node))
- ? Corresponding_Spec (gnat_node) : Defining_Entity (gnat_node));
-
- /* The FUNCTION_DECL node corresponding to the subprogram spec. */
- tree gnu_subprog_decl;
- /* The FUNCTION_TYPE node corresponding to the subprogram spec. */
- tree gnu_subprog_type;
- tree gnu_cico_list;
-
- /* If this is a generic object or if it has been eliminated,
- ignore it. */
-
- if (Ekind (gnat_subprog_id) == E_Generic_Procedure
- || Ekind (gnat_subprog_id) == E_Generic_Function
- || Is_Eliminated (gnat_subprog_id))
- break;
-
- /* If debug information is suppressed for the subprogram,
- turn debug mode off for the duration of processing. */
- if (Debug_Info_Off (gnat_subprog_id))
- {
- write_symbols = NO_DEBUG;
- debug_hooks = &do_nothing_debug_hooks;
- }
-
- /* If this subprogram acts as its own spec, define it. Otherwise,
- just get the already-elaborated tree node. However, if this
- subprogram had its elaboration deferred, we will already have
- made a tree node for it. So treat it as not being defined in
- that case. Such a subprogram cannot have an address clause or
- a freeze node, so this test is safe, though it does disable
- some otherwise-useful error checking. */
- gnu_subprog_decl
- = gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE,
- Acts_As_Spec (gnat_node)
- && ! present_gnu_tree (gnat_subprog_id));
-
- gnu_subprog_type = TREE_TYPE (gnu_subprog_decl);
-
- /* Set the line number in the decl to correspond to that of
- the body so that the line number notes are written
- correctly. */
- set_lineno (gnat_node, 0);
- DECL_SOURCE_FILE (gnu_subprog_decl) = input_filename;
- DECL_SOURCE_LINE (gnu_subprog_decl) = lineno;
-
- begin_subprog_body (gnu_subprog_decl);
- set_lineno (gnat_node, 1);
-
- pushlevel (0);
- gnu_block_stack = tree_cons (NULL_TREE, NULL_TREE, gnu_block_stack);
- expand_start_bindings (0);
-
- gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
-
- /* If there are OUT parameters, we need to ensure that the
- return statement properly copies them out. We do this by
- making a new block and converting any inner return into a goto
- to a label at the end of the block. */
-
- if (gnu_cico_list != 0)
- {
- gnu_return_label_stack
- = tree_cons (NULL_TREE,
- build_decl (LABEL_DECL, NULL_TREE, NULL_TREE),
- gnu_return_label_stack);
- pushlevel (0);
- expand_start_bindings (0);
- }
- else
- gnu_return_label_stack
- = tree_cons (NULL_TREE, NULL_TREE, gnu_return_label_stack);
-
- /* See if there are any parameters for which we don't yet have
- GCC entities. These must be for OUT parameters for which we
- will be making VAR_DECL nodes here. Fill them in to
- TYPE_CI_CO_LIST, which must contain the empty entry as well.
- We can match up the entries because TYPE_CI_CO_LIST is in the
- order of the parameters. */
-
- for (gnat_param = First_Formal (gnat_subprog_id);
- Present (gnat_param);
- gnat_param = Next_Formal_With_Extras (gnat_param))
- if (present_gnu_tree (gnat_param))
- adjust_decl_rtl (get_gnu_tree (gnat_param));
- else
- {
- /* Skip any entries that have been already filled in; they
- must correspond to IN OUT parameters. */
- for (; gnu_cico_list != 0 && TREE_VALUE (gnu_cico_list) != 0;
- gnu_cico_list = TREE_CHAIN (gnu_cico_list))
- ;
-
- /* Do any needed references for padded types. */
- TREE_VALUE (gnu_cico_list)
- = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_list)),
- gnat_to_gnu_entity (gnat_param, NULL_TREE, 1));
- }
-
- process_decls (Declarations (gnat_node), Empty, Empty, 1, 1);
-
- /* Generate the code of the subprogram itself. A return statement
- will be present and any OUT parameters will be handled there. */
- gnat_to_code (Handled_Statement_Sequence (gnat_node));
-
- expand_end_bindings (getdecls (), kept_level_p (), 0);
- poplevel (kept_level_p (), 1, 0);
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
-
- if (TREE_VALUE (gnu_return_label_stack) != 0)
- {
- tree gnu_retval;
-
- expand_end_bindings (NULL_TREE, kept_level_p (), 0);
- poplevel (kept_level_p (), 1, 0);
- expand_label (TREE_VALUE (gnu_return_label_stack));
-
- gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
- set_lineno (gnat_node, 1);
- if (list_length (gnu_cico_list) == 1)
- gnu_retval = TREE_VALUE (gnu_cico_list);
- else
- gnu_retval = build_constructor (TREE_TYPE (gnu_subprog_type),
- gnu_cico_list);
-
- if (DECL_P (gnu_retval) && DECL_BY_REF_P (gnu_retval))
- gnu_retval
- = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_retval);
-
- expand_return
- (build_binary_op (MODIFY_EXPR, NULL_TREE,
- DECL_RESULT (current_function_decl),
- gnu_retval));
-
- }
-
- gnu_return_label_stack = TREE_CHAIN (gnu_return_label_stack);
-
- /* Disconnect the trees for parameters that we made variables for
- from the GNAT entities since these will become unusable after
- we end the function. */
- for (gnat_param = First_Formal (gnat_subprog_id);
- Present (gnat_param);
- gnat_param = Next_Formal_With_Extras (gnat_param))
- if (TREE_CODE (get_gnu_tree (gnat_param)) == VAR_DECL)
- save_gnu_tree (gnat_param, NULL_TREE, 0);
-
- end_subprog_body ();
- mark_out_of_scope (Defining_Unit_Name (Specification (gnat_node)));
- write_symbols = save_write_symbols;
- debug_hooks = save_debug_hooks;
- }
- break;
-
- case N_Function_Call:
- case N_Procedure_Call_Statement:
-
- if (type_annotate_only)
- break;
-
- {
- /* The GCC node corresponding to the GNAT subprogram name. This can
- either be a FUNCTION_DECL node if we are dealing with a standard
- subprogram call, or an indirect reference expression (an
- INDIRECT_REF node) pointing to a subprogram. */
- tree gnu_subprog_node = gnat_to_gnu (Name (gnat_node));
- /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */
- tree gnu_subprog_type = TREE_TYPE (gnu_subprog_node);
- tree gnu_subprog_addr
- = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_subprog_node);
- Entity_Id gnat_formal;
- Node_Id gnat_actual;
- tree gnu_actual_list = NULL_TREE;
- tree gnu_name_list = NULL_TREE;
- tree gnu_after_list = NULL_TREE;
- tree gnu_subprog_call;
-
- switch (Nkind (Name (gnat_node)))
- {
- case N_Identifier:
- case N_Operator_Symbol:
- case N_Expanded_Name:
- case N_Attribute_Reference:
- if (Is_Eliminated (Entity (Name (gnat_node))))
- post_error_ne ("cannot call eliminated subprogram &!",
- gnat_node, Entity (Name (gnat_node)));
- }
-
- if (TREE_CODE (gnu_subprog_type) != FUNCTION_TYPE)
- gigi_abort (317);
-
- /* If we are calling a stubbed function, make this into a
- raise of Program_Error. Elaborate all our args first. */
-
- if (TREE_CODE (gnu_subprog_node) == FUNCTION_DECL
- && DECL_STUBBED_P (gnu_subprog_node))
- {
- for (gnat_actual = First_Actual (gnat_node);
- Present (gnat_actual);
- gnat_actual = Next_Actual (gnat_actual))
- expand_expr_stmt (gnat_to_gnu (gnat_actual));
-
- if (Nkind (gnat_node) == N_Function_Call)
- {
- gnu_result_type = TREE_TYPE (gnu_subprog_type);
- gnu_result
- = build1 (NULL_EXPR, gnu_result_type,
- build_call_raise (raise_program_error_decl));
- }
- else
- expand_expr_stmt (build_call_raise (raise_program_error_decl));
- break;
- }
-
- /* The only way we can be making a call via an access type is
- if Name is an explicit dereference. In that case, get the
- list of formal args from the type the access type is pointing
- to. Otherwise, get the formals from entity being called. */
- if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
- gnat_formal = First_Formal (Etype (Name (gnat_node)));
- else if (Nkind (Name (gnat_node)) == N_Attribute_Reference)
- /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */
- gnat_formal = 0;
- else
- gnat_formal = First_Formal (Entity (Name (gnat_node)));
-
- /* Create the list of the actual parameters as GCC expects it, namely
- a chain of TREE_LIST nodes in which the TREE_VALUE field of each
- node is a parameter-expression and the TREE_PURPOSE field is
- null. Skip OUT parameters that are not passed by reference. */
-
- for (gnat_actual = First_Actual (gnat_node);
- Present (gnat_actual);
- gnat_formal = Next_Formal_With_Extras (gnat_formal),
- gnat_actual = Next_Actual (gnat_actual))
- {
- tree gnu_formal_type = gnat_to_gnu_type (Etype (gnat_formal));
- Node_Id gnat_name
- = ((Nkind (gnat_actual) == N_Unchecked_Type_Conversion)
- ? Expression (gnat_actual) : gnat_actual);
- tree gnu_name = gnat_to_gnu (gnat_name);
- tree gnu_name_type = gnat_to_gnu_type (Etype (gnat_name));
- tree gnu_actual;
-
- /* If it's possible we may need to use this expression twice,
- make sure than any side-effects are handled via SAVE_EXPRs.
- Likewise if we need to force side-effects before the call.
- ??? This is more conservative than we need since we don't
- need to do this for pass-by-ref with no conversion.
- If we are passing a non-addressable Out or In Out parameter by
- reference, pass the address of a copy and set up to copy back
- out after the call. */
-
- if (Ekind (gnat_formal) != E_In_Parameter)
- {
- gnu_name = gnat_stabilize_reference (gnu_name, 1);
- if (! addressable_p (gnu_name)
- && present_gnu_tree (gnat_formal)
- && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
- || DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal))
- || DECL_BY_DESCRIPTOR_P (get_gnu_tree (gnat_formal))))
- {
- tree gnu_copy = gnu_name;
-
- /* Remove any unpadding on the actual and make a copy.
- But if the actual is a left-justified modular type,
- first convert to it. */
- if (TREE_CODE (gnu_name) == COMPONENT_REF
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_name, 0)))))
- gnu_name = gnu_copy = TREE_OPERAND (gnu_name, 0);
- else if (TREE_CODE (gnu_name_type) == RECORD_TYPE
- && (TYPE_LEFT_JUSTIFIED_MODULAR_P
- (gnu_name_type)))
- gnu_name = convert (gnu_name_type, gnu_name);
-
- gnu_actual = save_expr (gnu_name);
-
- /* Set up to move the copy back to the original. */
- gnu_after_list = tree_cons (gnu_copy, gnu_actual,
- gnu_after_list);
-
- gnu_name = gnu_actual;
- }
- }
-
- /* If this was a procedure call, we may not have removed any
- padding. So do it here for the part we will use as an
- input, if any. */
- gnu_actual = gnu_name;
- if (Ekind (gnat_formal) != E_Out_Parameter
- && TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)))
- gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
- gnu_actual);
-
- if (Ekind (gnat_formal) != E_Out_Parameter
- && Nkind (gnat_actual) != N_Unchecked_Type_Conversion
- && Do_Range_Check (gnat_actual))
- gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal));
-
- /* Do any needed conversions. We need only check for
- unchecked conversion since normal conversions will be handled
- by just converting to the formal type. */
- if (Nkind (gnat_actual) == N_Unchecked_Type_Conversion)
- {
- gnu_actual
- = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)),
- gnu_actual);
-
- /* One we've done the unchecked conversion, we still
- must ensure that the object is in range of the formal's
- type. */
- if (Ekind (gnat_formal) != E_Out_Parameter
- && Do_Range_Check (gnat_actual))
- gnu_actual = emit_range_check (gnu_actual,
- Etype (gnat_formal));
- }
- else
- /* We may have suppressed a conversion to the Etype of the
- actual since the parent is a procedure call. So add the
- conversion here. */
- gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
- gnu_actual);
-
- gnu_actual = convert (gnu_formal_type, gnu_actual);
-
- /* If we have not saved a GCC object for the formal, it means
- it is an OUT parameter not passed by reference. Otherwise,
- look at the PARM_DECL to see if it is passed by reference. */
- if (present_gnu_tree (gnat_formal)
- && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && DECL_BY_REF_P (get_gnu_tree (gnat_formal)))
- {
- if (Ekind (gnat_formal) != E_In_Parameter)
- {
- gnu_actual = gnu_name;
-
- /* If we have a padded type, be sure we've removed the
- padding. */
- if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)))
- gnu_actual
- = convert (get_unpadded_type (Etype (gnat_actual)),
- gnu_actual);
- }
-
- /* The symmetry of the paths to the type of an entity is
- broken here since arguments don't know that they will
- be passed by ref. */
- gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
- gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type,
- gnu_actual);
- }
- else if (present_gnu_tree (gnat_formal)
- && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal)))
- {
- gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
- gnu_actual = maybe_implicit_deref (gnu_actual);
- gnu_actual = maybe_unconstrained_array (gnu_actual);
-
- if (TREE_CODE (gnu_formal_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_formal_type))
- {
- gnu_formal_type
- = TREE_TYPE (TYPE_FIELDS (gnu_formal_type));
- gnu_actual = convert (gnu_formal_type, gnu_actual);
- }
-
- /* Take the address of the object and convert to the
- proper pointer type. We'd like to actually compute
- the address of the beginning of the array using
- an ADDR_EXPR of an ARRAY_REF, but there's a possibility
- that the ARRAY_REF might return a constant and we'd
- be getting the wrong address. Neither approach is
- exactly correct, but this is the most likely to work
- in all cases. */
- gnu_actual = convert (gnu_formal_type,
- build_unary_op (ADDR_EXPR, NULL_TREE,
- gnu_actual));
- }
- else if (present_gnu_tree (gnat_formal)
- && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && DECL_BY_DESCRIPTOR_P (get_gnu_tree (gnat_formal)))
- {
- /* If arg is 'Null_Parameter, pass zero descriptor. */
- if ((TREE_CODE (gnu_actual) == INDIRECT_REF
- || TREE_CODE (gnu_actual) == UNCONSTRAINED_ARRAY_REF)
- && TREE_PRIVATE (gnu_actual))
- gnu_actual
- = convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
- integer_zero_node);
- else
- gnu_actual
- = build_unary_op (ADDR_EXPR, NULL_TREE,
- fill_vms_descriptor (gnu_actual,
- gnat_formal));
- }
- else
- {
- tree gnu_actual_size = TYPE_SIZE (TREE_TYPE (gnu_actual));
-
- if (Ekind (gnat_formal) != E_In_Parameter)
- gnu_name_list
- = chainon (gnu_name_list,
- build_tree_list (NULL_TREE, gnu_name));
-
- if (! present_gnu_tree (gnat_formal)
- || TREE_CODE (get_gnu_tree (gnat_formal)) != PARM_DECL)
- continue;
-
- /* If this is 'Null_Parameter, pass a zero even though we are
- dereferencing it. */
- else if (TREE_CODE (gnu_actual) == INDIRECT_REF
- && TREE_PRIVATE (gnu_actual)
- && host_integerp (gnu_actual_size, 1)
- && 0 >= compare_tree_int (gnu_actual_size,
- BITS_PER_WORD))
- gnu_actual
- = unchecked_convert
- (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
- convert (type_for_size
- (tree_low_cst (gnu_actual_size, 1), 1),
- integer_zero_node));
- else
- gnu_actual
- = convert (TYPE_MAIN_VARIANT
- (DECL_ARG_TYPE (get_gnu_tree (gnat_formal))),
- gnu_actual);
- }
-
- gnu_actual_list
- = chainon (gnu_actual_list,
- build_tree_list (NULL_TREE, gnu_actual));
- }
-
- gnu_subprog_call = build (CALL_EXPR, TREE_TYPE (gnu_subprog_type),
- gnu_subprog_addr, gnu_actual_list,
- NULL_TREE);
- TREE_SIDE_EFFECTS (gnu_subprog_call) = 1;
-
- /* If it is a function call, the result is the call expression. */
- if (Nkind (gnat_node) == N_Function_Call)
- {
- gnu_result = gnu_subprog_call;
-
- /* If the function returns an unconstrained array or by reference,
- we have to de-dereference the pointer. */
- if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type)
- || TYPE_RETURNS_BY_REF_P (gnu_subprog_type))
- gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE,
- gnu_result);
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- }
-
- /* If this is the case where the GNAT tree contains a procedure call
- but the Ada procedure has copy in copy out parameters, the special
- parameter passing mechanism must be used. */
- else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
- {
- /* List of FIELD_DECLs associated with the PARM_DECLs of the copy
- in copy out parameters. */
- tree scalar_return_list = TYPE_CI_CO_LIST (gnu_subprog_type);
- int length = list_length (scalar_return_list);
-
- if (length > 1)
- {
- tree gnu_name;
-
- gnu_subprog_call = make_save_expr (gnu_subprog_call);
-
- /* If any of the names had side-effects, ensure they are
- all evaluated before the call. */
- for (gnu_name = gnu_name_list; gnu_name;
- gnu_name = TREE_CHAIN (gnu_name))
- if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name)))
- gnu_subprog_call
- = build (COMPOUND_EXPR, TREE_TYPE (gnu_subprog_call),
- TREE_VALUE (gnu_name), gnu_subprog_call);
- }
-
- if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
- gnat_formal = First_Formal (Etype (Name (gnat_node)));
- else
- gnat_formal = First_Formal (Entity (Name (gnat_node)));
-
- for (gnat_actual = First_Actual (gnat_node);
- Present (gnat_actual);
- gnat_formal = Next_Formal_With_Extras (gnat_formal),
- gnat_actual = Next_Actual (gnat_actual))
- /* If we are dealing with a copy in copy out parameter, we must
- retrieve its value from the record returned in the function
- call. */
- if (! (present_gnu_tree (gnat_formal)
- && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
- || (DECL_BY_COMPONENT_PTR_P
- (get_gnu_tree (gnat_formal)))
- || DECL_BY_DESCRIPTOR_P (get_gnu_tree (gnat_formal))))
- && Ekind (gnat_formal) != E_In_Parameter)
- {
- /* Get the value to assign to this OUT or IN OUT
- parameter. It is either the result of the function if
- there is only a single such parameter or the appropriate
- field from the record returned. */
- tree gnu_result
- = length == 1 ? gnu_subprog_call
- : build_component_ref
- (gnu_subprog_call, NULL_TREE,
- TREE_PURPOSE (scalar_return_list));
- int unchecked_conversion
- = Nkind (gnat_actual) == N_Unchecked_Type_Conversion;
- /* If the actual is a conversion, get the inner expression,
- which will be the real destination, and convert the
- result to the type of the actual parameter. */
- tree gnu_actual
- = maybe_unconstrained_array (TREE_VALUE (gnu_name_list));
-
- /* If the result is a padded type, remove the padding. */
- if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
- gnu_result
- = convert (TREE_TYPE (TYPE_FIELDS
- (TREE_TYPE (gnu_result))),
- gnu_result);
-
- /* If the result is a type conversion, do it. */
- if (Nkind (gnat_actual) == N_Type_Conversion)
- gnu_result
- = convert_with_check
- (Etype (Expression (gnat_actual)), gnu_result,
- Do_Overflow_Check (gnat_actual),
- Do_Range_Check (Expression (gnat_actual)),
- Float_Truncate (gnat_actual));
-
- else if (unchecked_conversion)
- gnu_result
- = unchecked_convert (TREE_TYPE (gnu_actual), gnu_result);
- else
- {
- if (Do_Range_Check (gnat_actual))
- gnu_result = emit_range_check (gnu_result,
- Etype (gnat_actual));
-
- if (! (! TREE_CONSTANT (TYPE_SIZE
- (TREE_TYPE (gnu_actual)))
- && TREE_CONSTANT (TYPE_SIZE
- (TREE_TYPE (gnu_result)))))
- gnu_result = convert (TREE_TYPE (gnu_actual),
- gnu_result);
- }
-
- set_lineno (gnat_node, 1);
- expand_expr_stmt (build_binary_op (MODIFY_EXPR, NULL_TREE,
- gnu_actual, gnu_result));
- scalar_return_list = TREE_CHAIN (scalar_return_list);
- gnu_name_list = TREE_CHAIN (gnu_name_list);
- }
- }
- else
- {
- set_lineno (gnat_node, 1);
- expand_expr_stmt (gnu_subprog_call);
- }
-
- /* Handle anything we need to assign back. */
- for (gnu_expr = gnu_after_list;
- gnu_expr;
- gnu_expr = TREE_CHAIN (gnu_expr))
- expand_expr_stmt (build_binary_op (MODIFY_EXPR, NULL_TREE,
- TREE_PURPOSE (gnu_expr),
- TREE_VALUE (gnu_expr)));
- }
- break;
-
- /*************************/
- /* Chapter 7: Packages: */
- /*************************/
-
- case N_Package_Declaration:
- gnat_to_code (Specification (gnat_node));
- break;
-
- case N_Package_Specification:
-
- process_decls (Visible_Declarations (gnat_node),
- Private_Declarations (gnat_node), Empty, 1, 1);
- break;
-
- case N_Package_Body:
-
- /* If this is the body of a generic package - do nothing */
- if (Ekind (Corresponding_Spec (gnat_node)) == E_Generic_Package)
- break;
-
- process_decls (Declarations (gnat_node), Empty, Empty, 1, 1);
-
- if (Present (Handled_Statement_Sequence (gnat_node)))
- {
- gnu_block_stack = tree_cons (NULL_TREE, NULL_TREE, gnu_block_stack);
- gnat_to_code (Handled_Statement_Sequence (gnat_node));
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
- }
- break;
-
- /*********************************/
- /* Chapter 8: Visibility Rules: */
- /*********************************/
-
- case N_Use_Package_Clause:
- case N_Use_Type_Clause:
- /* Nothing to do here - but these may appear in list of declarations */
- break;
-
- /***********************/
- /* Chapter 9: Tasks: */
- /***********************/
-
- case N_Protected_Type_Declaration:
- break;
-
- case N_Single_Task_Declaration:
- gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
- break;
-
- /***********************************************************/
- /* Chapter 10: Program Structure and Compilation Issues: */
- /***********************************************************/
-
- case N_Compilation_Unit:
-
- /* For a body, first process the spec if there is one. */
- if (Nkind (Unit (gnat_node)) == N_Package_Body
- || (Nkind (Unit (gnat_node)) == N_Subprogram_Body
- && ! Acts_As_Spec (gnat_node)))
- gnat_to_code (Library_Unit (gnat_node));
-
- process_inlined_subprograms (gnat_node);
-
- if (type_annotate_only && gnat_node == Cunit (Main_Unit))
- {
- elaborate_all_entities (gnat_node);
-
- if (Nkind (Unit (gnat_node)) == N_Subprogram_Declaration
- || Nkind (Unit (gnat_node)) == N_Generic_Package_Declaration
- || Nkind (Unit (gnat_node)) == N_Generic_Subprogram_Declaration)
- break;
- };
-
- process_decls (Declarations (Aux_Decls_Node (gnat_node)),
- Empty, Empty, 1, 1);
-
- gnat_to_code (Unit (gnat_node));
-
- /* Process any pragmas following the unit. */
- if (Present (Pragmas_After (Aux_Decls_Node (gnat_node))))
- for (gnat_temp = First (Pragmas_After (Aux_Decls_Node (gnat_node)));
- gnat_temp; gnat_temp = Next (gnat_temp))
- gnat_to_code (gnat_temp);
-
- /* Put all the Actions into the elaboration routine if we already had
- elaborations. This will happen anyway if they are statements, but we
- want to force declarations there too due to order-of-elaboration
- issues. Most should have Is_Statically_Allocated set. If we
- have had no elaborations, we have no order-of-elaboration issue and
- don't want to create elaborations here. */
- if (Is_Non_Empty_List (Actions (Aux_Decls_Node (gnat_node))))
- for (gnat_temp = First (Actions (Aux_Decls_Node (gnat_node)));
- Present (gnat_temp); gnat_temp = Next (gnat_temp))
- {
- if (pending_elaborations_p ())
- add_pending_elaborations (NULL_TREE,
- make_transform_expr (gnat_temp));
- else
- gnat_to_code (gnat_temp);
- }
-
- /* Generate elaboration code for this unit, if necessary, and
- say whether we did or not. */
- Set_Has_No_Elaboration_Code
- (gnat_node,
- build_unit_elab
- (Defining_Entity (Unit (gnat_node)),
- Nkind (Unit (gnat_node)) == N_Package_Body
- || Nkind (Unit (gnat_node)) == N_Subprogram_Body,
- get_pending_elaborations ()));
-
- break;
-
- case N_Subprogram_Body_Stub:
- case N_Package_Body_Stub:
- case N_Protected_Body_Stub:
- case N_Task_Body_Stub:
- /* Simply process whatever unit is being inserted. */
- gnat_to_code (Unit (Library_Unit (gnat_node)));
- break;
-
- case N_Subunit:
- gnat_to_code (Proper_Body (gnat_node));
- break;
-
- /***************************/
- /* Chapter 11: Exceptions: */
- /***************************/
-
- case N_Handled_Sequence_Of_Statements:
- /* If there are exception handlers, start a new binding level that
- we can exit (since each exception handler will do so). Then
- declare a variable to save the old __gnat_jmpbuf value and a
- variable for our jmpbuf. Call setjmp and handle each of the
- possible exceptions if it returns one. */
-
- if (! type_annotate_only && Present (Exception_Handlers (gnat_node)))
- {
- tree gnu_jmpsave_decl = 0;
- tree gnu_jmpbuf_decl = 0;
- tree gnu_cleanup_call = 0;
- tree gnu_cleanup_decl;
-
- pushlevel (0);
- expand_start_bindings (1);
-
- if (! Zero_Cost_Handling (gnat_node))
- {
- gnu_jmpsave_decl
- = create_var_decl (get_identifier ("JMPBUF_SAVE"), NULL_TREE,
- jmpbuf_ptr_type,
- build_call_0_expr (get_jmpbuf_decl),
- 0, 0, 0, 0, 0);
-
- gnu_jmpbuf_decl = create_var_decl (get_identifier ("JMP_BUF"),
- NULL_TREE, jmpbuf_type,
- NULL_TREE, 0, 0, 0, 0,
- 0);
- TREE_VALUE (gnu_block_stack) = gnu_jmpbuf_decl;
- }
-
- /* See if we are to call a function when exiting this block. */
- if (Present (At_End_Proc (gnat_node)))
- {
- gnu_cleanup_call
- = build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node)));
-
- gnu_cleanup_decl
- = create_var_decl (get_identifier ("CLEANUP"), NULL_TREE,
- integer_type_node, NULL_TREE, 0, 0, 0, 0,
- 0);
-
- expand_decl_cleanup (gnu_cleanup_decl, gnu_cleanup_call);
- }
-
- if (! Zero_Cost_Handling (gnat_node))
- {
- /* When we exit this block, restore the saved value. */
- expand_decl_cleanup (gnu_jmpsave_decl,
- build_call_1_expr (set_jmpbuf_decl,
- gnu_jmpsave_decl));
-
- /* Call setjmp and handle exceptions if it returns one. */
- set_lineno (gnat_node, 1);
- expand_start_cond
- (build_call_1_expr (setjmp_decl,
- build_unary_op (ADDR_EXPR, NULL_TREE,
- gnu_jmpbuf_decl)),
- 0);
-
- /* Restore our incoming longjmp value before we do anything. */
- expand_expr_stmt (build_call_1_expr (set_jmpbuf_decl,
- gnu_jmpsave_decl));
-
- pushlevel (0);
- expand_start_bindings (0);
-
- gnu_except_ptr_stack
- = tree_cons (NULL_TREE,
- create_var_decl
- (get_identifier ("EXCEPT_PTR"), NULL_TREE,
- build_pointer_type (except_type_node),
- build_call_0_expr (get_excptr_decl),
- 0, 0, 0, 0, 0),
- gnu_except_ptr_stack);
-
- /* Generate code for each exception handler. The code at
- N_Exception_Handler below does the real work. Note that
- we ignore the dummy exception handler for the identifier
- case, this is used only by the front end */
- if (Present (Exception_Handlers (gnat_node)))
- for (gnat_temp
- = First_Non_Pragma (Exception_Handlers (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next_Non_Pragma (gnat_temp))
- gnat_to_code (gnat_temp);
-
- /* If none of the exception handlers did anything, re-raise
- but do not defer abortion. */
- set_lineno (gnat_node, 1);
- expand_expr_stmt
- (build_call_1_expr (raise_nodefer_decl,
- TREE_VALUE (gnu_except_ptr_stack)));
-
- gnu_except_ptr_stack = TREE_CHAIN (gnu_except_ptr_stack);
- expand_end_bindings (getdecls (), kept_level_p (), 0);
- poplevel (kept_level_p (), 1, 0);
-
- /* End the "if" on setjmp. Note that we have arranged things so
- control never returns here. */
- expand_end_cond ();
-
- /* This is now immediately before the body proper. Set
- our jmp_buf as the current buffer. */
- expand_expr_stmt
- (build_call_1_expr (set_jmpbuf_decl,
- build_unary_op (ADDR_EXPR, NULL_TREE,
- gnu_jmpbuf_decl)));
- }
- }
-
- /* If there are no exception handlers, we must not have an at end
- cleanup identifier, since the cleanup identifier should always
- generate a corresponding exception handler. */
- else if (! type_annotate_only && Present (At_End_Proc (gnat_node)))
- gigi_abort (335);
-
- /* Generate code and declarations for the prefix of this block,
- if any. */
- if (Present (First_Real_Statement (gnat_node)))
- process_decls (Statements (gnat_node), Empty,
- First_Real_Statement (gnat_node), 1, 1);
-
- /* Generate code for each statement in the block. */
- for (gnat_temp = (Present (First_Real_Statement (gnat_node))
- ? First_Real_Statement (gnat_node)
- : First (Statements (gnat_node)));
- Present (gnat_temp); gnat_temp = Next (gnat_temp))
- gnat_to_code (gnat_temp);
-
- /* For zero-cost exceptions, exit the block and then compile
- the handlers. */
- if (! type_annotate_only && Zero_Cost_Handling (gnat_node)
- && Present (Exception_Handlers (gnat_node)))
- {
- expand_exit_something ();
- gnu_except_ptr_stack
- = tree_cons (NULL_TREE, error_mark_node, gnu_except_ptr_stack);
-
- for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next_Non_Pragma (gnat_temp))
- gnat_to_code (gnat_temp);
-
- gnu_except_ptr_stack = TREE_CHAIN (gnu_except_ptr_stack);
- }
-
- /* If we have handlers, close the block we made. */
- if (! type_annotate_only && Present (Exception_Handlers (gnat_node)))
- {
- expand_end_bindings (getdecls (), kept_level_p (), 0);
- poplevel (kept_level_p (), 1, 0);
- }
-
- break;
-
- case N_Exception_Handler:
- if (! Zero_Cost_Handling (gnat_node))
- {
- /* Unless this is "Others" or the special "Non-Ada" exception
- for Ada, make an "if" statement to select the proper
- exceptions. For "Others", exclude exceptions where
- Handled_By_Others is nonzero unless the All_Others flag is set.
- For "Non-ada", accept an exception if "Lang" is 'V'. */
- tree gnu_choice = integer_zero_node;
-
- for (gnat_temp = First (Exception_Choices (gnat_node));
- gnat_temp; gnat_temp = Next (gnat_temp))
- {
- tree this_choice;
-
- if (Nkind (gnat_temp) == N_Others_Choice)
- {
- if (All_Others (gnat_temp))
- this_choice = integer_one_node;
- else
- this_choice
- = build_binary_op
- (EQ_EXPR, integer_type_node,
- convert
- (integer_type_node,
- build_component_ref
- (build_unary_op
- (INDIRECT_REF, NULL_TREE,
- TREE_VALUE (gnu_except_ptr_stack)),
- get_identifier ("not_handled_by_others"), NULL_TREE)),
- integer_zero_node);
- }
-
- else if (Nkind (gnat_temp) == N_Identifier
- || Nkind (gnat_temp) == N_Expanded_Name)
- {
- /* ??? Note that we have to use gnat_to_gnu_entity here
- since the type of the exception will be wrong in the
- VMS case and that's exactly what this test is for. */
- gnu_expr
- = gnat_to_gnu_entity (Entity (gnat_temp), NULL_TREE, 0);
-
- /* If this was a VMS exception, check import_code
- against the value of the exception. */
- if (TREE_CODE (TREE_TYPE (gnu_expr)) == INTEGER_TYPE)
- this_choice
- = build_binary_op
- (EQ_EXPR, integer_type_node,
- build_component_ref
- (build_unary_op
- (INDIRECT_REF, NULL_TREE,
- TREE_VALUE (gnu_except_ptr_stack)),
- get_identifier ("import_code"), NULL_TREE),
- gnu_expr);
- else
- this_choice
- = build_binary_op
- (EQ_EXPR, integer_type_node,
- TREE_VALUE (gnu_except_ptr_stack),
- convert
- (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack)),
- build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr)));
-
- /* If this is the distinguished exception "Non_Ada_Error"
- (and we are in VMS mode), also allow a non-Ada
- exception (a VMS condition) to match. */
- if (Is_Non_Ada_Error (Entity (gnat_temp)))
- {
- tree gnu_comp
- = build_component_ref
- (build_unary_op
- (INDIRECT_REF, NULL_TREE,
- TREE_VALUE (gnu_except_ptr_stack)),
- get_identifier ("lang"), NULL_TREE);
-
- this_choice
- = build_binary_op
- (TRUTH_ORIF_EXPR, integer_type_node,
- build_binary_op
- (EQ_EXPR, integer_type_node, gnu_comp,
- convert (TREE_TYPE (gnu_comp),
- build_int_2 ('V', 0))),
- this_choice);
- }
- }
- else
- gigi_abort (318);
-
- gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
- gnu_choice, this_choice);
- }
-
- set_lineno (gnat_node, 1);
-
- expand_start_cond (gnu_choice, 0);
- }
-
- for (gnat_temp = First (Statements (gnat_node));
- gnat_temp; gnat_temp = Next (gnat_temp))
- gnat_to_code (gnat_temp);
-
- /* At the end of the handler, exit the block. We made this block
- in N_Handled_Sequence_Of_Statements. */
- expand_exit_something ();
-
- if (! Zero_Cost_Handling (gnat_node))
- expand_end_cond ();
-
- break;
-
- /*******************************/
- /* Chapter 12: Generic Units: */
- /*******************************/
-
- case N_Generic_Function_Renaming_Declaration:
- case N_Generic_Package_Renaming_Declaration:
- case N_Generic_Procedure_Renaming_Declaration:
- case N_Generic_Package_Declaration:
- case N_Generic_Subprogram_Declaration:
- case N_Package_Instantiation:
- case N_Procedure_Instantiation:
- case N_Function_Instantiation:
- /* These nodes can appear on a declaration list but there is nothing to
- to be done with them. */
- break;
-
-
- /***************************************************/
- /* Chapter 13: Representation Clauses and */
- /* Implementation-Dependent Features: */
- /***************************************************/
-
- case N_Attribute_Definition_Clause:
-
- /* The only one we need deal with is for 'Address. For the others, SEM
- puts the information elsewhere. We need only deal with 'Address
- if the object has a Freeze_Node (which it never will currently). */
- if (Get_Attribute_Id (Chars (gnat_node)) != Attr_Address
- || No (Freeze_Node (Entity (Name (gnat_node)))))
- break;
-
- /* Get the value to use as the address and save it as the
- equivalent for GNAT_TEMP. When the object is frozen,
- gnat_to_gnu_entity will do the right thing. */
- gnu_expr = gnat_to_gnu (Expression (gnat_node));
- save_gnu_tree (Entity (Name (gnat_node)), gnu_expr, 1);
- break;
-
- case N_Enumeration_Representation_Clause:
- case N_Record_Representation_Clause:
- case N_At_Clause:
- /* We do nothing with these. SEM puts the information elsewhere. */
- break;
-
- case N_Code_Statement:
- if (! type_annotate_only)
- {
- tree gnu_template = gnat_to_gnu (Asm_Template (gnat_node));
- tree gnu_input_list = 0, gnu_output_list = 0, gnu_orig_out_list = 0;
- tree gnu_clobber_list = 0;
- char *clobber;
-
- /* First process inputs, then outputs, then clobbers. */
- Setup_Asm_Inputs (gnat_node);
- while (Present (gnat_temp = Asm_Input_Value ()))
- {
- tree gnu_value = gnat_to_gnu (gnat_temp);
- tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
- (Asm_Input_Constraint ()));
-
- gnu_input_list
- = tree_cons (gnu_constr, gnu_value, gnu_input_list);
- Next_Asm_Input ();
- }
-
- Setup_Asm_Outputs (gnat_node);
- while (Present (gnat_temp = Asm_Output_Variable ()))
- {
- tree gnu_value = gnat_to_gnu (gnat_temp);
- tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
- (Asm_Output_Constraint ()));
-
- gnu_orig_out_list
- = tree_cons (gnu_constr, gnu_value, gnu_orig_out_list);
- gnu_output_list
- = tree_cons (gnu_constr, gnu_value, gnu_output_list);
- Next_Asm_Output ();
- }
-
- Clobber_Setup (gnat_node);
- while ((clobber = Clobber_Get_Next ()) != 0)
- gnu_clobber_list
- = tree_cons (NULL_TREE,
- build_string (strlen (clobber) + 1, clobber),
- gnu_clobber_list);
-
- expand_asm_operands (gnu_template, nreverse (gnu_output_list),
- nreverse (gnu_input_list), gnu_clobber_list,
- Is_Asm_Volatile (gnat_node),
- input_filename, lineno);
-
- /* Copy all the intermediate outputs into the specified outputs. */
- for (; gnu_output_list;
- (gnu_output_list = TREE_CHAIN (gnu_output_list),
- gnu_orig_out_list = TREE_CHAIN (gnu_orig_out_list)))
- if (TREE_VALUE (gnu_orig_out_list) != TREE_VALUE (gnu_output_list))
- {
- expand_expr_stmt
- (build_binary_op (MODIFY_EXPR, NULL_TREE,
- TREE_VALUE (gnu_orig_out_list),
- TREE_VALUE (gnu_output_list)));
- free_temp_slots ();
- }
- }
- break;
-
- /***************************************************/
- /* Added Nodes */
- /***************************************************/
-
- case N_Freeze_Entity:
- process_freeze_entity (gnat_node);
- process_decls (Actions (gnat_node), Empty, Empty, 1, 1);
- break;
-
- case N_Itype_Reference:
- if (! present_gnu_tree (Itype (gnat_node)))
- process_type (Itype (gnat_node));
- break;
-
- case N_Free_Statement:
- if (! type_annotate_only)
- {
- tree gnu_ptr = gnat_to_gnu (Expression (gnat_node));
- tree gnu_obj_type;
- tree gnu_obj_size;
- int align;
-
- /* If this is an unconstrained array, we know the object must
- have been allocated with the template in front of the object.
- So pass the template address, but get the total size. Do this
- by converting to a thin pointer. */
- if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
- gnu_ptr
- = convert (build_pointer_type
- (TYPE_OBJECT_RECORD_TYPE
- (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
- gnu_ptr);
-
- gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
- gnu_obj_size = TYPE_SIZE_UNIT (gnu_obj_type);
- align = TYPE_ALIGN (gnu_obj_type);
-
- if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
- {
- tree gnu_char_ptr_type = build_pointer_type (char_type_node);
- tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
- tree gnu_byte_offset
- = convert (gnu_char_ptr_type,
- size_diffop (size_zero_node, gnu_pos));
-
- gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
- gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
- gnu_ptr, gnu_byte_offset);
- }
-
- set_lineno (gnat_node, 1);
- expand_expr_stmt
- (build_call_alloc_dealloc (gnu_ptr, gnu_obj_size, align,
- Procedure_To_Call (gnat_node),
- Storage_Pool (gnat_node)));
- }
- break;
-
- case N_Raise_Constraint_Error:
- case N_Raise_Program_Error:
- case N_Raise_Storage_Error:
-
- if (type_annotate_only)
- break;
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result
- = build_call_raise
- (Nkind (gnat_node) == N_Raise_Constraint_Error
- ? raise_constraint_error_decl
- : Nkind (gnat_node) == N_Raise_Program_Error
- ? raise_program_error_decl : raise_storage_error_decl);
-
- /* If the type is VOID, this is a statement, so we need to
- generate the code for the call. Handle a Condition, if there
- is one. */
- if (TREE_CODE (gnu_result_type) == VOID_TYPE)
- {
- set_lineno (gnat_node, 1);
-
- if (Present (Condition (gnat_node)))
- expand_start_cond (gnat_to_gnu (Condition (gnat_node)), 0);
-
- expand_expr_stmt (gnu_result);
- if (Present (Condition (gnat_node)))
- expand_end_cond ();
- gnu_result = error_mark_node;
- }
- else
- gnu_result = build1 (NULL_EXPR, gnu_result_type, gnu_result);
- break;
-
- /* Nothing to do, since front end does all validation using the
- values that Gigi back-annotates. */
- case N_Validate_Unchecked_Conversion:
- break;
-
- case N_Raise_Statement:
- case N_Function_Specification:
- case N_Procedure_Specification:
- case N_Op_Concat:
- case N_Component_Association:
- case N_Task_Body:
- default:
- if (! type_annotate_only)
- gigi_abort (321);
- }
-
- /* If the result is a constant that overflows, raise constraint error. */
- if (TREE_CODE (gnu_result) == INTEGER_CST
- && TREE_CONSTANT_OVERFLOW (gnu_result))
- {
- post_error ("Constraint_Error will be raised at run-time?", gnat_node);
-
- gnu_result
- = build1 (NULL_EXPR, gnu_result_type,
- build_call_raise (raise_constraint_error_decl));
- }
-
- /* If our result has side-effects and is of an unconstrained type,
- make a SAVE_EXPR so that we can be sure it will only be referenced
- once. Note we must do this before any conversions. */
- if (TREE_SIDE_EFFECTS (gnu_result)
- && (TREE_CODE (gnu_result_type) == UNCONSTRAINED_ARRAY_TYPE
- || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (gnu_result_type)))))
- gnu_result = gnat_stabilize_reference (gnu_result, 0);
-
- /* Now convert the result to the proper type. If the type is void or if
- we have no result, return error_mark_node to show we have no result.
- If the type of the result is correct or if we have a label (which doesn't
- have any well-defined type), return our result. Also don't do the
- conversion if the "desired" type involves a PLACEHOLDER_EXPR in its size
- since those are the cases where the front end may have the type wrong due
- to "instantiating" the unconstrained record with discriminant values
- or if this is a FIELD_DECL. If this is the Name of an assignment
- statement or a parameter of a procedure call, return what we have since
- the RHS has to be converted to our type there in that case, unless
- GNU_RESULT_TYPE has a simpler size. Similarly, if the two types are
- record types with the same name, the expression type has integral mode,
- and GNU_RESULT_TYPE BLKmode, don't convert. This will be the case when
- we are converting from a packable type to its actual type and we need
- those conversions to be NOPs in order for assignments into these types to
- work properly if the inner object is a bitfield and hence can't have
- its address taken. Finally, don't convert integral types that are the
- operand of an unchecked conversion since we need to ignore those
- conversions (for 'Valid). Otherwise, convert the result to the proper
- type. */
-
- if (Present (Parent (gnat_node))
- && ((Nkind (Parent (gnat_node)) == N_Assignment_Statement
- && Name (Parent (gnat_node)) == gnat_node)
- || (Nkind (Parent (gnat_node)) == N_Procedure_Call_Statement
- && Name (Parent (gnat_node)) != gnat_node)
- || (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion
- && ! AGGREGATE_TYPE_P (gnu_result_type)
- && ! AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
- || Nkind (Parent (gnat_node)) == N_Parameter_Association)
- && ! (TYPE_SIZE (gnu_result_type) != 0
- && TYPE_SIZE (TREE_TYPE (gnu_result)) != 0
- && (AGGREGATE_TYPE_P (gnu_result_type)
- == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
- && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST
- && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result)))
- != INTEGER_CST))
- || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
- && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result)))
- != INTEGER_CST)
- && ! (contains_placeholder_p (TYPE_SIZE (gnu_result_type)))
- && (contains_placeholder_p
- (TYPE_SIZE (TREE_TYPE (gnu_result))))))
- && ! (TREE_CODE (gnu_result_type) == RECORD_TYPE
- && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_result_type))))
- {
- /* In this case remove padding only if the inner object is of
- self-referential size: in that case it must be an object of
- unconstrained type with a default discriminant. In other cases,
- we want to avoid copying too much data. */
- if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))
- && contains_placeholder_p (TYPE_SIZE
- (TREE_TYPE (TYPE_FIELDS
- (TREE_TYPE (gnu_result))))))
- gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
- gnu_result);
- }
-
- else if (TREE_CODE (gnu_result) == LABEL_DECL
- || TREE_CODE (gnu_result) == FIELD_DECL
- || TREE_CODE (gnu_result) == ERROR_MARK
- || (TYPE_SIZE (gnu_result_type) != 0
- && TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
- && TREE_CODE (gnu_result) != INDIRECT_REF
- && contains_placeholder_p (TYPE_SIZE (gnu_result_type)))
- || ((TYPE_NAME (gnu_result_type)
- == TYPE_NAME (TREE_TYPE (gnu_result)))
- && TREE_CODE (gnu_result_type) == RECORD_TYPE
- && TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
- && TYPE_MODE (gnu_result_type) == BLKmode
- && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (gnu_result)))
- == MODE_INT)))
- {
- /* Remove any padding record, but do nothing more in this case. */
- if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
- gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
- gnu_result);
- }
-
- else if (gnu_result == error_mark_node
- || gnu_result_type == void_type_node)
- gnu_result = error_mark_node;
- else if (gnu_result_type != TREE_TYPE (gnu_result))
- gnu_result = convert (gnu_result_type, gnu_result);
-
- /* We don't need any NOP_EXPR or NON_LVALUE_EXPR on GNU_RESULT. */
- while ((TREE_CODE (gnu_result) == NOP_EXPR
- || TREE_CODE (gnu_result) == NON_LVALUE_EXPR)
- && TREE_TYPE (TREE_OPERAND (gnu_result, 0)) == TREE_TYPE (gnu_result))
- gnu_result = TREE_OPERAND (gnu_result, 0);
-
- return gnu_result;
-}
-\f
-/* Force references to each of the entities in packages GNAT_NODE with's
- so that the debugging information for all of them are identical
- in all clients. Operate recursively on anything it with's, but check
- that we aren't elaborating something more than once. */
-
-/* The reason for this routine's existence is two-fold.
- First, with some debugging formats, notably MDEBUG on SGI
- IRIX, the linker will remove duplicate debugging information if two
- clients have identical debugguing information. With the normal scheme
- of elaboration, this does not usually occur, since entities in with'ed
- packages are elaborated on demand, and if clients have different usage
- patterns, the normal case, then the order and selection of entities
- will differ. In most cases however, it seems that linkers do not know
- how to eliminate duplicate debugging information, even if it is
- identical, so the use of this routine would increase the total amount
- of debugging information in the final executable.
-
- Second, this routine is called in type_annotate mode, to compute DDA
- information for types in withed units, for ASIS use */
-
-static void
-elaborate_all_entities (gnat_node)
- Node_Id gnat_node;
-{
- Entity_Id gnat_with_clause, gnat_entity;
-
- save_gnu_tree (gnat_node, integer_zero_node, 1);
-
- /* Save entities in all context units. A body may have an implicit_with
- on its own spec, if the context includes a child unit, so don't save
- the spec twice. */
-
- for (gnat_with_clause = First (Context_Items (gnat_node));
- Present (gnat_with_clause);
- gnat_with_clause = Next (gnat_with_clause))
- if (Nkind (gnat_with_clause) == N_With_Clause
- && ! present_gnu_tree (Library_Unit (gnat_with_clause))
- && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit)))
- {
- elaborate_all_entities (Library_Unit (gnat_with_clause));
-
- if (Ekind (Entity (Name (gnat_with_clause))) == E_Package)
- for (gnat_entity = First_Entity (Entity (Name (gnat_with_clause)));
- Present (gnat_entity);
- gnat_entity = Next_Entity (gnat_entity))
- if (Is_Public (gnat_entity)
- && Convention (gnat_entity) != Convention_Intrinsic
- && Ekind (gnat_entity) != E_Package
- && Ekind (gnat_entity) != E_Package_Body
- && Ekind (gnat_entity) != E_Operator
- && ! (IN (Ekind (gnat_entity), Type_Kind)
- && ! Is_Frozen (gnat_entity))
- && ! ((Ekind (gnat_entity) == E_Procedure
- || Ekind (gnat_entity) == E_Function)
- && Is_Intrinsic_Subprogram (gnat_entity))
- && ! IN (Ekind (gnat_entity), Named_Kind)
- && ! IN (Ekind (gnat_entity), Generic_Unit_Kind))
- gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
- }
-
- if (Nkind (Unit (gnat_node)) == N_Package_Body && type_annotate_only)
- elaborate_all_entities (Library_Unit (gnat_node));
-}
-\f
-/* Do the processing of N_Freeze_Entity, GNAT_NODE. */
-
-static void
-process_freeze_entity (gnat_node)
- Node_Id gnat_node;
-{
- Entity_Id gnat_entity = Entity (gnat_node);
- tree gnu_old;
- tree gnu_new;
- tree gnu_init
- = (Nkind (Declaration_Node (gnat_entity)) == N_Object_Declaration
- && present_gnu_tree (Declaration_Node (gnat_entity)))
- ? get_gnu_tree (Declaration_Node (gnat_entity)) : NULL_TREE;
-
- /* If this is a package, need to generate code for the package. */
- if (Ekind (gnat_entity) == E_Package)
- {
- insert_code_for
- (Parent (Corresponding_Body
- (Parent (Declaration_Node (gnat_entity)))));
- return;
- }
-
- /* Check for old definition after the above call. This Freeze_Node
- might be for one its Itypes. */
- gnu_old
- = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
-
- /* If this entity has an Address representation clause, GNU_OLD is the
- address, so discard it here. */
- if (Present (Address_Clause (gnat_entity)))
- gnu_old = 0;
-
- /* Don't do anything for class-wide types they are always
- transformed into their root type. */
- if (Ekind (gnat_entity) == E_Class_Wide_Type
- || (Ekind (gnat_entity) == E_Class_Wide_Subtype
- && Present (Equivalent_Type (gnat_entity))))
- return;
-
- /* Don't do anything for subprograms that may have been elaborated before
- their freeze nodes. This can happen, for example because of an inner call
- in an instance body. */
- if (gnu_old != 0
- && TREE_CODE (gnu_old) == FUNCTION_DECL
- && (Ekind (gnat_entity) == E_Function
- || Ekind (gnat_entity) == E_Procedure))
- return;
-
- /* If we have a non-dummy type old tree, we have nothing to do. Unless
- this is the public view of a private type whose full view was not
- delayed, this node was never delayed as it should have been.
- Also allow this to happen for concurrent types since we may have
- frozen both the Corresponding_Record_Type and this type. */
- if (gnu_old != 0
- && ! (TREE_CODE (gnu_old) == TYPE_DECL
- && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old))))
- {
- if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_entity))
- && No (Freeze_Node (Full_View (gnat_entity))))
- return;
- else if (Is_Concurrent_Type (gnat_entity))
- return;
- else
- gigi_abort (320);
- }
-
- /* Reset the saved tree, if any, and elaborate the object or type for real.
- If there is a full declaration, elaborate it and copy the type to
- GNAT_ENTITY. Likewise if this is the record subtype corresponding to
- a class wide type or subtype. */
- if (gnu_old != 0)
- {
- save_gnu_tree (gnat_entity, NULL_TREE, 0);
- if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_entity))
- && present_gnu_tree (Full_View (gnat_entity)))
- save_gnu_tree (Full_View (gnat_entity), NULL_TREE, 0);
- if (Present (Class_Wide_Type (gnat_entity))
- && Class_Wide_Type (gnat_entity) != gnat_entity)
- save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, 0);
- }
-
- if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_entity)))
- {
- gnu_new = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 1);
-
- /* The above call may have defined this entity (the simplest example
- of this is when we have a private enumeral type since the bounds
- will have the public view. */
- if (! present_gnu_tree (gnat_entity))
- save_gnu_tree (gnat_entity, gnu_new, 0);
- if (Present (Class_Wide_Type (gnat_entity))
- && Class_Wide_Type (gnat_entity) != gnat_entity)
- save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, 0);
- }
- else
- gnu_new = gnat_to_gnu_entity (gnat_entity, gnu_init, 1);
-
- /* If we've made any pointers to the old version of this type, we
- have to update them. Also copy the name of the old object to
- the new one. */
-
- if (gnu_old != 0)
- {
- DECL_NAME (gnu_new) = DECL_NAME (gnu_old);
- update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
- TREE_TYPE (gnu_new));
- }
-}
-\f
-/* Process the list of inlined subprograms of GNAT_NODE, which is an
- N_Compilation_Unit. */
-
-static void
-process_inlined_subprograms (gnat_node)
- Node_Id gnat_node;
-{
- Entity_Id gnat_entity;
- Node_Id gnat_body;
-
- /* If we can inline, generate RTL for all the inlined subprograms.
- Define the entity first so we set DECL_EXTERNAL. */
- if (optimize > 0 && ! flag_no_inline)
- for (gnat_entity = First_Inlined_Subprogram (gnat_node);
- Present (gnat_entity);
- gnat_entity = Next_Inlined_Subprogram (gnat_entity))
- {
- gnat_body = Parent (Declaration_Node (gnat_entity));
-
- if (Nkind (gnat_body) != N_Subprogram_Body)
- {
- /* ??? This really should always be Present. */
- if (No (Corresponding_Body (gnat_body)))
- continue;
-
- gnat_body
- = Parent (Declaration_Node (Corresponding_Body (gnat_body)));
- }
-
- if (Present (gnat_body))
- {
- gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
- gnat_to_code (gnat_body);
- }
- }
-}
-\f
-/* Elaborate decls in the lists GNAT_DECLS and GNAT_DECLS2, if present.
- We make two passes, one to elaborate anything other than bodies (but
- we declare a function if there was no spec). The second pass
- elaborates the bodies.
-
- GNAT_END_LIST gives the element in the list past the end. Normally,
- this is Empty, but can be First_Real_Statement for a
- Handled_Sequence_Of_Statements.
-
- We make a complete pass through both lists if PASS1P is true, then make
- the second pass over both lists if PASS2P is true. The lists usually
- correspond to the public and private parts of a package. */
-
-static void
-process_decls (gnat_decls, gnat_decls2, gnat_end_list, pass1p, pass2p)
- List_Id gnat_decls, gnat_decls2;
- Node_Id gnat_end_list;
- int pass1p, pass2p;
-{
- List_Id gnat_decl_array[2];
- Node_Id gnat_decl;
- int i;
-
- gnat_decl_array[0] = gnat_decls, gnat_decl_array[1] = gnat_decls2;
-
- if (pass1p)
- for (i = 0; i <= 1; i++)
- if (Present (gnat_decl_array[i]))
- for (gnat_decl = First (gnat_decl_array[i]);
- gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
- {
- set_lineno (gnat_decl, 0);
-
- /* For package specs, we recurse inside the declarations,
- thus taking the two pass approach inside the boundary. */
- if (Nkind (gnat_decl) == N_Package_Declaration
- && (Nkind (Specification (gnat_decl)
- == N_Package_Specification)))
- process_decls (Visible_Declarations (Specification (gnat_decl)),
- Private_Declarations (Specification (gnat_decl)),
- Empty, 1, 0);
-
- /* Similarly for any declarations in the actions of a
- freeze node. */
- else if (Nkind (gnat_decl) == N_Freeze_Entity)
- {
- process_freeze_entity (gnat_decl);
- process_decls (Actions (gnat_decl), Empty, Empty, 1, 0);
- }
-
- /* Package bodies with freeze nodes get their elaboration deferred
- until the freeze node, but the code must be placed in the right
- place, so record the code position now. */
- else if (Nkind (gnat_decl) == N_Package_Body
- && Present (Freeze_Node (Corresponding_Spec (gnat_decl))))
- record_code_position (gnat_decl);
-
- else if (Nkind (gnat_decl) == N_Package_Body_Stub
- && Present (Library_Unit (gnat_decl))
- && Present (Freeze_Node
- (Corresponding_Spec
- (Proper_Body (Unit
- (Library_Unit (gnat_decl)))))))
- record_code_position
- (Proper_Body (Unit (Library_Unit (gnat_decl))));
-
- /* We defer most subprogram bodies to the second pass.
- However, Init_Proc subprograms cannot be defered, but luckily
- don't need to be. */
- else if ((Nkind (gnat_decl) == N_Subprogram_Body
- && (Chars (Defining_Entity (gnat_decl))
- != Name_uInit_Proc)))
- {
- if (Acts_As_Spec (gnat_decl))
- {
- Node_Id gnat_subprog_id = Defining_Entity (gnat_decl);
-
- if (Ekind (gnat_subprog_id) != E_Generic_Procedure
- && Ekind (gnat_subprog_id) != E_Generic_Function)
- gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
- }
- }
- /* For bodies and stubs that act as their own specs, the entity
- itself must be elaborated in the first pass, because it may
- be used in other declarations. */
- else if (Nkind (gnat_decl) == N_Subprogram_Body_Stub)
- {
- Node_Id gnat_subprog_id =
- Defining_Entity (Specification (gnat_decl));
-
- if (Ekind (gnat_subprog_id) != E_Subprogram_Body
- && Ekind (gnat_subprog_id) != E_Generic_Procedure
- && Ekind (gnat_subprog_id) != E_Generic_Function)
- gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
- }
-
- /* Concurrent stubs stand for the corresponding subprogram bodies,
- which are deferred like other bodies. */
- else if (Nkind (gnat_decl) == N_Task_Body_Stub
- || Nkind (gnat_decl) == N_Protected_Body_Stub)
- ;
-
- else
- gnat_to_code (gnat_decl);
- }
-
- /* Here we elaborate everything we deferred above except for package bodies,
- which are elaborated at their freeze nodes. Note that we must also
- go inside things (package specs and freeze nodes) the first pass did. */
- if (pass2p)
- for (i = 0; i <= 1; i++)
- if (Present (gnat_decl_array[i]))
- for (gnat_decl = First (gnat_decl_array[i]);
- gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
- {
- if ((Nkind (gnat_decl) == N_Subprogram_Body
- && (Chars (Defining_Entity (gnat_decl))
- != Name_uInit_Proc))
- || Nkind (gnat_decl) == N_Subprogram_Body_Stub
- || Nkind (gnat_decl) == N_Task_Body_Stub
- || Nkind (gnat_decl) == N_Protected_Body_Stub)
- gnat_to_code (gnat_decl);
-
- else if (Nkind (gnat_decl) == N_Package_Declaration
- && (Nkind (Specification (gnat_decl)
- == N_Package_Specification)))
- process_decls (Visible_Declarations (Specification (gnat_decl)),
- Private_Declarations (Specification (gnat_decl)),
- Empty, 0, 1);
-
- else if (Nkind (gnat_decl) == N_Freeze_Entity)
- process_decls (Actions (gnat_decl), Empty, Empty, 0, 1);
- }
-}
-\f
-/* Emits an access check. GNU_EXPR is the expression that needs to be
- checked against the NULL pointer. */
-
-static tree
-emit_access_check (gnu_expr)
- tree gnu_expr;
-{
- tree gnu_type = TREE_TYPE (gnu_expr);
-
- /* This only makes sense if GNU_TYPE is a pointer of some sort. */
- if (! POINTER_TYPE_P (gnu_type) && ! TYPE_FAT_POINTER_P (gnu_type))
- gigi_abort (322);
-
- /* Checked expressions must be evaluated only once. */
- gnu_expr = make_save_expr (gnu_expr);
-
- return emit_check (build_binary_op (EQ_EXPR, integer_type_node,
- gnu_expr,
- convert (TREE_TYPE (gnu_expr),
- integer_zero_node)),
- gnu_expr);
-}
-
-/* Emits a discriminant check. GNU_EXPR is the expression to be checked and
- GNAT_NODE a N_Selected_Component node. */
-
-static tree
-emit_discriminant_check (gnu_expr, gnat_node)
- tree gnu_expr;
- Node_Id gnat_node;
-{
- Entity_Id orig_comp
- = Original_Record_Component (Entity (Selector_Name (gnat_node)));
- Entity_Id gnat_discr_fct = Discriminant_Checking_Func (orig_comp);
- tree gnu_discr_fct;
- Entity_Id gnat_discr;
- tree gnu_actual_list = NULL_TREE;
- tree gnu_cond;
- Entity_Id gnat_pref_type;
- tree gnu_pref_type;
-
- if (Is_Tagged_Type (Scope (orig_comp)))
- gnat_pref_type = Scope (orig_comp);
- else
- gnat_pref_type = Etype (Prefix (gnat_node));
-
- if (! Present (gnat_discr_fct))
- return gnu_expr;
-
- gnu_discr_fct = gnat_to_gnu (gnat_discr_fct);
-
- /* Checked expressions must be evaluated only once. */
- gnu_expr = make_save_expr (gnu_expr);
-
- /* Create the list of the actual parameters as GCC expects it.
- This list is the list of the discriminant fields of the
- record expression to be discriminant checked. For documentation
- on what is the GCC format for this list see under the
- N_Function_Call case */
-
- while (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind)
- || IN (Ekind (gnat_pref_type), Access_Kind))
- {
- if (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind))
- gnat_pref_type = Underlying_Type (gnat_pref_type);
- else if (IN (Ekind (gnat_pref_type), Access_Kind))
- gnat_pref_type = Designated_Type (gnat_pref_type);
- }
-
- gnu_pref_type
- = TREE_TYPE (gnat_to_gnu_entity (gnat_pref_type, NULL_TREE, 0));
-
- for (gnat_discr = First_Discriminant (gnat_pref_type);
- Present (gnat_discr); gnat_discr = Next_Discriminant (gnat_discr))
- {
- Entity_Id gnat_real_discr
- = ((Present (Corresponding_Discriminant (gnat_discr))
- && Present (Parent_Subtype (gnat_pref_type)))
- ? Corresponding_Discriminant (gnat_discr) : gnat_discr);
- tree gnu_discr = gnat_to_gnu_entity (gnat_real_discr, NULL_TREE, 0);
-
- gnu_actual_list
- = chainon (gnu_actual_list,
- build_tree_list (NULL_TREE,
- build_component_ref
- (convert (gnu_pref_type, gnu_expr),
- NULL_TREE, gnu_discr)));
- }
-
- gnu_cond = build (CALL_EXPR,
- TREE_TYPE (TREE_TYPE (gnu_discr_fct)),
- build_unary_op (ADDR_EXPR, NULL_TREE, gnu_discr_fct),
- gnu_actual_list,
- NULL_TREE);
- TREE_SIDE_EFFECTS (gnu_cond) = 1;
-
- return
- build_unary_op
- (INDIRECT_REF, NULL_TREE,
- emit_check (gnu_cond,
- build_unary_op (ADDR_EXPR,
- build_reference_type (TREE_TYPE (gnu_expr)),
- gnu_expr)));
-}
-\f
-/* Emit code for a range check. GNU_EXPR is the expression to be checked,
- GNAT_RANGE_TYPE the gnat type or subtype containing the bounds against
- which we have to check. */
-
-static tree
-emit_range_check (gnu_expr, gnat_range_type)
- tree gnu_expr;
- Entity_Id gnat_range_type;
-{
- tree gnu_range_type = get_unpadded_type (gnat_range_type);
- tree gnu_low = TYPE_MIN_VALUE (gnu_range_type);
- tree gnu_high = TYPE_MAX_VALUE (gnu_range_type);
- tree gnu_compare_type = get_base_type (TREE_TYPE (gnu_expr));
-
- /* If GNU_EXPR has an integral type that is narrower than GNU_RANGE_TYPE,
- we can't do anything since we might be truncating the bounds. No
- check is needed in this case. */
- if (INTEGRAL_TYPE_P (TREE_TYPE (gnu_expr))
- && (TYPE_PRECISION (gnu_compare_type)
- < TYPE_PRECISION (get_base_type (gnu_range_type))))
- return gnu_expr;
-
- /* Checked expressions must be evaluated only once. */
- gnu_expr = make_save_expr (gnu_expr);
-
- /* There's no good type to use here, so we might as well use
- integer_type_node. Note that the form of the check is
- (not (expr >= lo)) or (not (expr >= hi))
- the reason for this slightly convoluted form is that NaN's
- are not considered to be in range in the float case. */
- return emit_check
- (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
- invert_truthvalue
- (build_binary_op (GE_EXPR, integer_type_node,
- convert (gnu_compare_type, gnu_expr),
- convert (gnu_compare_type, gnu_low))),
- invert_truthvalue
- (build_binary_op (LE_EXPR, integer_type_node,
- convert (gnu_compare_type, gnu_expr),
- convert (gnu_compare_type,
- gnu_high)))),
- gnu_expr);
-}
-\f
-/* Emit code for an index check. GNU_ARRAY_OBJECT is the array object
- which we are about to index, GNU_EXPR is the index expression to be
- checked, GNU_LOW and GNU_HIGH are the lower and upper bounds
- against which GNU_EXPR has to be checked. Note that for index
- checking we cannot use the emit_range_check function (although very
- similar code needs to be generated in both cases) since for index
- checking the array type against which we are checking the indeces
- may be unconstrained and consequently we need to retrieve the
- actual index bounds from the array object itself
- (GNU_ARRAY_OBJECT). The place where we need to do that is in
- subprograms having unconstrained array formal parameters */
-
-static tree
-emit_index_check (gnu_array_object, gnu_expr, gnu_low, gnu_high)
- tree gnu_array_object;
- tree gnu_expr;
- tree gnu_low;
- tree gnu_high;
-{
- tree gnu_expr_check;
-
- /* Checked expressions must be evaluated only once. */
- gnu_expr = make_save_expr (gnu_expr);
-
- /* Must do this computation in the base type in case the expression's
- type is an unsigned subtypes. */
- gnu_expr_check = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
-
- /* If GNU_LOW or GNU_HIGH are a PLACEHOLDER_EXPR, qualify them by
- the object we are handling. */
- if (TREE_CODE (gnu_low) != INTEGER_CST && contains_placeholder_p (gnu_low))
- gnu_low = build (WITH_RECORD_EXPR, TREE_TYPE (gnu_low),
- gnu_low, gnu_array_object);
-
- if (TREE_CODE (gnu_high) != INTEGER_CST && contains_placeholder_p (gnu_high))
- gnu_high = build (WITH_RECORD_EXPR, TREE_TYPE (gnu_high),
- gnu_high, gnu_array_object);
-
- /* There's no good type to use here, so we might as well use
- integer_type_node. */
- return emit_check
- (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
- build_binary_op (LT_EXPR, integer_type_node,
- gnu_expr_check,
- convert (TREE_TYPE (gnu_expr_check),
- gnu_low)),
- build_binary_op (GT_EXPR, integer_type_node,
- gnu_expr_check,
- convert (TREE_TYPE (gnu_expr_check),
- gnu_high))),
- gnu_expr);
-}
-\f
-/* Given GNU_COND which contains the condition corresponding to an access,
- discriminant or range check, of value GNU_EXPR, build a COND_EXPR
- that returns GNU_EXPR if GNU_COND is false and raises a
- CONSTRAINT_ERROR if GNU_COND is true. */
-
-static tree
-emit_check (gnu_cond, gnu_expr)
- tree gnu_cond;
- tree gnu_expr;
-{
- tree gnu_call;
-
- gnu_call = build_call_raise (raise_constraint_error_decl);
-
- /* Use an outer COMPOUND_EXPR to make sure that GNU_EXPR will
- get evaluated in front of the comparison in case it ends
- up being a SAVE_EXPR. Put the whole thing inside its own
- SAVE_EXPR do the inner SAVE_EXPR doesn't leak out. */
-
- return make_save_expr (build (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_expr,
- fold (build (COND_EXPR, TREE_TYPE (gnu_expr),
- gnu_cond,
- build (COMPOUND_EXPR,
- TREE_TYPE (gnu_expr),
- gnu_call, gnu_expr),
- gnu_expr))));
-}
-\f
-/* Return an expression that converts GNU_EXPR to GNAT_TYPE, doing
- overflow checks if OVERFLOW_P is nonzero and range checks if
- RANGE_P is nonzero. GNAT_TYPE is known to be an integral type.
- If TRUNCATE_P is nonzero, do a float to integer conversion with
- truncation; otherwise round. */
-
-static tree
-convert_with_check (gnat_type, gnu_expr, overflow_p, range_p, truncate_p)
- Entity_Id gnat_type;
- tree gnu_expr;
- int overflow_p;
- int range_p;
- int truncate_p;
-{
- tree gnu_type = get_unpadded_type (gnat_type);
- tree gnu_in_type = TREE_TYPE (gnu_expr);
- tree gnu_in_basetype = get_base_type (gnu_in_type);
- tree gnu_base_type = get_base_type (gnu_type);
- tree gnu_ada_base_type = get_ada_base_type (gnu_type);
- tree gnu_in_lb = TYPE_MIN_VALUE (gnu_in_basetype);
- tree gnu_in_ub = TYPE_MAX_VALUE (gnu_in_basetype);
- tree gnu_out_lb = TYPE_MIN_VALUE (gnu_base_type);
- tree gnu_out_ub = TYPE_MAX_VALUE (gnu_base_type);
- tree gnu_result = gnu_expr;
-
- /* If we are not doing any checks, the output is an integral type, and
- the input is not a floating type, just do the conversion. This
- shortcut is required to avoid problems with packed array types
- and simplifies code in all cases anyway. */
- if (! range_p && ! overflow_p && INTEGRAL_TYPE_P (gnu_base_type)
- && ! FLOAT_TYPE_P (gnu_in_type))
- return convert (gnu_type, gnu_expr);
-
- /* First convert the expression to its base type. This
- will never generate code, but makes the tests below much simpler.
- But don't do this if converting from an integer type to an unconstrained
- array type since then we need to get the bounds from the original
- (unpacked) type. */
- if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE)
- gnu_result = convert (gnu_in_basetype, gnu_result);
-
- /* If overflow checks are requested, we need to be sure the result will
- fit in the output base type. But don't do this if the input
- is integer and the output floating-point. */
- if (overflow_p
- && ! (FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype)))
- {
- /* Ensure GNU_EXPR only gets evaluated once. */
- tree gnu_input = make_save_expr (gnu_result);
- tree gnu_cond = integer_zero_node;
-
- /* Convert the lower bounds to signed types, so we're sure we're
- comparing them properly. Likewise, convert the upper bounds
- to unsigned types. */
- if (INTEGRAL_TYPE_P (gnu_in_basetype) && TREE_UNSIGNED (gnu_in_basetype))
- gnu_in_lb = convert (signed_type (gnu_in_basetype), gnu_in_lb);
-
- if (INTEGRAL_TYPE_P (gnu_in_basetype)
- && ! TREE_UNSIGNED (gnu_in_basetype))
- gnu_in_ub = convert (unsigned_type (gnu_in_basetype), gnu_in_ub);
-
- if (INTEGRAL_TYPE_P (gnu_base_type) && TREE_UNSIGNED (gnu_base_type))
- gnu_out_lb = convert (signed_type (gnu_base_type), gnu_out_lb);
-
- if (INTEGRAL_TYPE_P (gnu_base_type) && ! TREE_UNSIGNED (gnu_base_type))
- gnu_out_ub = convert (unsigned_type (gnu_base_type), gnu_out_ub);
-
- /* Check each bound separately and only if the result bound
- is tighter than the bound on the input type. Note that all the
- types are base types, so the bounds must be constant. Also,
- the comparison is done in the base type of the input, which
- always has the proper signedness. First check for input
- integer (which means output integer), output float (which means
- both float), or mixed, in which case we always compare.
- Note that we have to do the comparison which would *fail* in the
- case of an error since if it's an FP comparison and one of the
- values is a NaN or Inf, the comparison will fail. */
- if (INTEGRAL_TYPE_P (gnu_in_basetype)
- ? tree_int_cst_lt (gnu_in_lb, gnu_out_lb)
- : (FLOAT_TYPE_P (gnu_base_type)
- ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_in_lb),
- TREE_REAL_CST (gnu_out_lb))
- : 1))
- gnu_cond
- = invert_truthvalue
- (build_binary_op (GE_EXPR, integer_type_node,
- gnu_input, convert (gnu_in_basetype,
- gnu_out_lb)));
-
- if (INTEGRAL_TYPE_P (gnu_in_basetype)
- ? tree_int_cst_lt (gnu_out_ub, gnu_in_ub)
- : (FLOAT_TYPE_P (gnu_base_type)
- ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_out_ub),
- TREE_REAL_CST (gnu_in_lb))
- : 1))
- gnu_cond
- = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, gnu_cond,
- invert_truthvalue
- (build_binary_op (LE_EXPR, integer_type_node,
- gnu_input,
- convert (gnu_in_basetype,
- gnu_out_ub))));
-
- if (! integer_zerop (gnu_cond))
- gnu_result = emit_check (gnu_cond, gnu_input);
- }
-
- /* Now convert to the result base type. If this is a non-truncating
- float-to-integer conversion, round. */
- if (INTEGRAL_TYPE_P (gnu_ada_base_type) && FLOAT_TYPE_P (gnu_in_basetype)
- && ! truncate_p)
- {
- tree gnu_point_5 = build_real (gnu_in_basetype, dconstp5);
- tree gnu_minus_point_5 = build_real (gnu_in_basetype, dconstmp5);
- tree gnu_zero = convert (gnu_in_basetype, integer_zero_node);
- tree gnu_saved_result = save_expr (gnu_result);
- tree gnu_comp = build (GE_EXPR, integer_type_node,
- gnu_saved_result, gnu_zero);
- tree gnu_adjust = build (COND_EXPR, gnu_in_basetype, gnu_comp,
- gnu_point_5, gnu_minus_point_5);
-
- gnu_result
- = build (PLUS_EXPR, gnu_in_basetype, gnu_saved_result, gnu_adjust);
- }
-
- if (TREE_CODE (gnu_ada_base_type) == INTEGER_TYPE
- && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_ada_base_type)
- && TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF)
- gnu_result = unchecked_convert (gnu_ada_base_type, gnu_result);
- else
- gnu_result = convert (gnu_ada_base_type, gnu_result);
-
- /* Finally, do the range check if requested. Note that if the
- result type is a modular type, the range check is actually
- an overflow check. */
-
- if (range_p
- || (TREE_CODE (gnu_base_type) == INTEGER_TYPE
- && TYPE_MODULAR_P (gnu_base_type) && overflow_p))
- gnu_result = emit_range_check (gnu_result, gnat_type);
-
- return convert (gnu_type, gnu_result);
-}
-\f
-/* Return 1 if GNU_EXPR can be directly addressed. This is the case unless
- it is an expression involving computation or if it involves a bitfield
- reference. This returns the same as mark_addressable in most cases. */
-
-static int
-addressable_p (gnu_expr)
- tree gnu_expr;
-{
- switch (TREE_CODE (gnu_expr))
- {
- case UNCONSTRAINED_ARRAY_REF:
- case INDIRECT_REF:
- case VAR_DECL:
- case PARM_DECL:
- case FUNCTION_DECL:
- case RESULT_DECL:
- case CONSTRUCTOR:
- case NULL_EXPR:
- return 1;
-
- case COMPONENT_REF:
- return (! DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1))
- && addressable_p (TREE_OPERAND (gnu_expr, 0)));
-
- case ARRAY_REF: case ARRAY_RANGE_REF:
- case REALPART_EXPR: case IMAGPART_EXPR:
- case NOP_EXPR:
- return addressable_p (TREE_OPERAND (gnu_expr, 0));
-
- case CONVERT_EXPR:
- return (AGGREGATE_TYPE_P (TREE_TYPE (gnu_expr))
- && addressable_p (TREE_OPERAND (gnu_expr, 0)));
-
- case UNCHECKED_CONVERT_EXPR:
- {
- /* This is addressable if the code in gnat_expand_expr can do
- it by either just taking the operand or by pointer punning. */
- tree inner = TREE_OPERAND (gnu_expr, 0);
- tree type = TREE_TYPE (gnu_expr);
- tree inner_type = TREE_TYPE (inner);
-
- return ((TYPE_MODE (type) == TYPE_MODE (inner_type)
- && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
- || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT))
- || ((TYPE_MODE (type) == BLKmode
- || TYPE_MODE (inner_type) == BLKmode)
- && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
- || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT
- || TYPE_ALIGN_OK_P (type)
- || TYPE_ALIGN_OK_P (inner_type))));
- }
-
- default:
- return 0;
- }
-}
-\f
-/* Do the processing for the declaration of a GNAT_ENTITY, a type. If
- a separate Freeze node exists, delay the bulk of the processing. Otherwise
- make a GCC type for GNAT_ENTITY and set up the correspondance. */
-
-void
-process_type (gnat_entity)
- Entity_Id gnat_entity;
-{
- tree gnu_old
- = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
- tree gnu_new;
-
- /* If we are to delay elaboration of this type, just do any
- elaborations needed for expressions within the declaration and
- make a dummy type entry for this node and its Full_View (if
- any) in case something points to it. Don't do this if it
- has already been done (the only way that can happen is if
- the private completion is also delayed). */
- if (Present (Freeze_Node (gnat_entity))
- || (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_entity))
- && Freeze_Node (Full_View (gnat_entity))
- && ! present_gnu_tree (Full_View (gnat_entity))))
- {
- elaborate_entity (gnat_entity);
-
- if (gnu_old == 0)
- {
- tree gnu_decl = create_type_decl (get_entity_name (gnat_entity),
- make_dummy_type (gnat_entity),
- 0, 0, 0);
-
- save_gnu_tree (gnat_entity, gnu_decl, 0);
- if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_entity)))
- save_gnu_tree (Full_View (gnat_entity), gnu_decl, 0);
- }
-
- return;
- }
-
- /* If we saved away a dummy type for this node it means that this
- made the type that corresponds to the full type of an incomplete
- type. Clear that type for now and then update the type in the
- pointers. */
- if (gnu_old != 0)
- {
- if (TREE_CODE (gnu_old) != TYPE_DECL
- || ! TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)))
- {
- /* If this was a withed access type, this is not an error
- and merely indicates we've already elaborated the type
- already. */
- if (Is_Type (gnat_entity) && From_With_Type (gnat_entity))
- return;
-
- gigi_abort (323);
- }
-
- save_gnu_tree (gnat_entity, NULL_TREE, 0);
- }
-
- /* Now fully elaborate the type. */
- gnu_new = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 1);
- if (TREE_CODE (gnu_new) != TYPE_DECL)
- gigi_abort (324);
-
- /* If we have an old type and we've made pointers to this type,
- update those pointers. */
- if (gnu_old != 0)
- update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
- TREE_TYPE (gnu_new));
-
- /* If this is a record type corresponding to a task or protected type
- that is a completion of an incomplete type, perform a similar update
- on the type. */
- /* ??? Including protected types here is a guess. */
-
- if (IN (Ekind (gnat_entity), Record_Kind)
- && Is_Concurrent_Record_Type (gnat_entity)
- && present_gnu_tree (Corresponding_Concurrent_Type (gnat_entity)))
- {
- tree gnu_task_old
- = get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity));
-
- save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
- NULL_TREE, 0);
- save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
- gnu_new, 0);
-
- update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old)),
- TREE_TYPE (gnu_new));
- }
-}
-\f
-/* GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate.
- GNU_TYPE is the GCC type of the corresponding record.
-
- Return a CONSTRUCTOR to build the record. */
-
-static tree
-assoc_to_constructor (gnat_assoc, gnu_type)
- Node_Id gnat_assoc;
- tree gnu_type;
-{
- tree gnu_field, gnu_list, gnu_result;
-
- /* We test for GNU_FIELD being empty in the case where a variant
- was the last thing since we don't take things off GNAT_ASSOC in
- that case. We check GNAT_ASSOC in case we have a variant, but it
- has no fields. */
-
- for (gnu_list = NULL_TREE; Present (gnat_assoc);
- gnat_assoc = Next (gnat_assoc))
- {
- Node_Id gnat_field = First (Choices (gnat_assoc));
- tree gnu_field = gnat_to_gnu_entity (Entity (gnat_field), NULL_TREE, 0);
- tree gnu_expr = gnat_to_gnu (Expression (gnat_assoc));
-
- /* The expander is supposed to put a single component selector name
- in every record component association */
- if (Next (gnat_field))
- gigi_abort (328);
-
- /* Before assigning a value in an aggregate make sure range checks
- are done if required. Then convert to the type of the field. */
- if (Do_Range_Check (Expression (gnat_assoc)))
- gnu_expr = emit_range_check (gnu_expr, Etype (gnat_field));
-
- gnu_expr = convert (TREE_TYPE (gnu_field), gnu_expr);
-
- /* Add the field and expression to the list. */
- gnu_list = tree_cons (gnu_field, gnu_expr, gnu_list);
- }
-
- gnu_result = extract_values (gnu_list, gnu_type);
-
- /* Verify every enty in GNU_LIST was used. */
- for (gnu_field = gnu_list; gnu_field; gnu_field = TREE_CHAIN (gnu_field))
- if (! TREE_ADDRESSABLE (gnu_field))
- gigi_abort (311);
-
- return gnu_result;
-}
-
-/* Builds a possibly nested constructor for array aggregates. GNAT_EXPR
- is the first element of an array aggregate. It may itself be an
- aggregate (an array or record aggregate). GNU_ARRAY_TYPE is the gnu type
- corresponding to the array aggregate. GNAT_COMPONENT_TYPE is the type
- of the array component. It is needed for range checking. */
-
-static tree
-pos_to_constructor (gnat_expr, gnu_array_type, gnat_component_type)
- Node_Id gnat_expr;
- tree gnu_array_type;
- Entity_Id gnat_component_type;
-{
- tree gnu_expr;
- tree gnu_expr_list = NULL_TREE;
-
- for ( ; Present (gnat_expr); gnat_expr = Next (gnat_expr))
- {
- /* If the expression is itself an array aggregate then first build the
- innermost constructor if it is part of our array (multi-dimensional
- case). */
-
- if (Nkind (gnat_expr) == N_Aggregate
- && TREE_CODE (TREE_TYPE (gnu_array_type)) == ARRAY_TYPE
- && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_array_type)))
- gnu_expr = pos_to_constructor (First (Expressions (gnat_expr)),
- TREE_TYPE (gnu_array_type),
- gnat_component_type);
- else
- {
- gnu_expr = gnat_to_gnu (gnat_expr);
-
- /* before assigning the element to the array make sure it is
- in range */
- if (Do_Range_Check (gnat_expr))
- gnu_expr = emit_range_check (gnu_expr, gnat_component_type);
- }
-
- gnu_expr_list
- = tree_cons (NULL_TREE, convert (TREE_TYPE (gnu_array_type), gnu_expr),
- gnu_expr_list);
- }
-
- return build_constructor (gnu_array_type, nreverse (gnu_expr_list));
-}
-\f
-/* Subroutine of assoc_to_constructor: VALUES is a list of field associations,
- some of which are from RECORD_TYPE. Return a CONSTRUCTOR consisting
- of the associations that are from RECORD_TYPE. If we see an internal
- record, make a recursive call to fill it in as well. */
-
-static tree
-extract_values (values, record_type)
- tree values;
- tree record_type;
-{
- tree result = NULL_TREE;
- tree field, tem;
-
- for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
- {
- tree value = 0;
-
- /* _Parent is an internal field, but may have values in the aggregate,
- so check for values first. */
- if ((tem = purpose_member (field, values)) != 0)
- {
- value = TREE_VALUE (tem);
- TREE_ADDRESSABLE (tem) = 1;
- }
-
- else if (DECL_INTERNAL_P (field))
- {
- value = extract_values (values, TREE_TYPE (field));
- if (TREE_CODE (value) == CONSTRUCTOR
- && CONSTRUCTOR_ELTS (value) == 0)
- value = 0;
- }
- else
- /* If we have a record subtype, the names will match, but not the
- actual FIELD_DECLs. */
- for (tem = values; tem; tem = TREE_CHAIN (tem))
- if (DECL_NAME (TREE_PURPOSE (tem)) == DECL_NAME (field))
- {
- value = convert (TREE_TYPE (field), TREE_VALUE (tem));
- TREE_ADDRESSABLE (tem) = 1;
- }
-
- if (value == 0)
- continue;
-
- result = tree_cons (field, value, result);
- }
-
- return build_constructor (record_type, nreverse (result));
-}
-\f
-/* EXP is to be treated as an array or record. Handle the cases when it is
- an access object and perform the required dereferences. */
-
-static tree
-maybe_implicit_deref (exp)
- tree exp;
-{
- /* If the type is a pointer, dereference it. */
-
- if (POINTER_TYPE_P (TREE_TYPE (exp)) || TYPE_FAT_POINTER_P (TREE_TYPE (exp)))
- exp = build_unary_op (INDIRECT_REF, NULL_TREE, exp);
-
- /* If we got a padded type, remove it too. */
- if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (exp)))
- exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp);
-
- return exp;
-}
-\f
-/* Surround EXP with a SAVE_EXPR, but handle unconstrained objects specially
- since it doesn't make any sense to put them in a SAVE_EXPR. */
-
-tree
-make_save_expr (exp)
- tree exp;
-{
- tree type = TREE_TYPE (exp);
-
- /* If this is an unchecked conversion, save the input since we may need to
- handle this expression separately if it's the operand of a component
- reference. */
- if (TREE_CODE (exp) == UNCHECKED_CONVERT_EXPR)
- return build1 (UNCHECKED_CONVERT_EXPR, type,
- make_save_expr (TREE_OPERAND (exp, 0)));
-
- /* If this is an aggregate type, we may be doing a dereference of it in
- the LHS side of an assignment. In that case, we need to evaluate
- it , take its address, make a SAVE_EXPR of that, then do the indirect
- reference. Note that for an unconstrained array, the effect will be
- to make a SAVE_EXPR of the fat pointer.
-
- ??? This is an efficiency problem in the case of a type that can be
- placed into memory, but until we can deal with the LHS issue,
- we have to take that hit. This really should test for BLKmode. */
- else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE
- || (AGGREGATE_TYPE_P (type) && ! TYPE_FAT_POINTER_P (type)))
- return
- build_unary_op (INDIRECT_REF, type,
- save_expr (build_unary_op (ADDR_EXPR,
- build_reference_type (type),
- exp)));
-
- /* Otherwise, just do the usual thing. */
- return save_expr (exp);
-}
-\f
-/* This is equivalent to stabilize_reference in GCC's tree.c, but we know
- how to handle our new nodes and we take an extra argument that says
- whether to force evaluation of everything. */
-
-tree
-gnat_stabilize_reference (ref, force)
- tree ref;
- int force;
-{
- register tree type = TREE_TYPE (ref);
- register enum tree_code code = TREE_CODE (ref);
- register tree result;
-
- switch (code)
- {
- case VAR_DECL:
- case PARM_DECL:
- case RESULT_DECL:
- /* No action is needed in this case. */
- return ref;
-
- case NOP_EXPR:
- case CONVERT_EXPR:
- case FLOAT_EXPR:
- case FIX_TRUNC_EXPR:
- case FIX_FLOOR_EXPR:
- case FIX_ROUND_EXPR:
- case FIX_CEIL_EXPR:
- case UNCHECKED_CONVERT_EXPR:
- case ADDR_EXPR:
- result
- = build1 (code, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0), force));
- break;
-
- case INDIRECT_REF:
- case UNCONSTRAINED_ARRAY_REF:
- result = build1 (code, type,
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
- force));
- break;
-
- case COMPONENT_REF:
- result = build (COMPONENT_REF, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0),
- force),
- TREE_OPERAND (ref, 1));
- break;
-
- case BIT_FIELD_REF:
- result = build (BIT_FIELD_REF, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
- force),
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 2),
- force));
- break;
-
- case ARRAY_REF:
- result = build (ARRAY_REF, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
- force));
- break;
-
- case ARRAY_RANGE_REF:
- result = build (ARRAY_RANGE_REF, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
- force));
- break;
-
- case COMPOUND_EXPR:
- result = build (COMPOUND_EXPR, type,
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
- force),
- gnat_stabilize_reference (TREE_OPERAND (ref, 1),
- force));
- break;
-
- case RTL_EXPR:
- result = build1 (INDIRECT_REF, type,
- save_expr (build1 (ADDR_EXPR,
- build_reference_type (type), ref)));
- break;
-
- /* If arg isn't a kind of lvalue we recognize, make no change.
- Caller should recognize the error for an invalid lvalue. */
- default:
- return ref;
-
- case ERROR_MARK:
- return error_mark_node;
- }
-
- TREE_READONLY (result) = TREE_READONLY (ref);
- return result;
-}
-
-/* Similar to stabilize_reference_1 in tree.c, but supports an extra
- arg to force a SAVE_EXPR for everything. */
-
-static tree
-gnat_stabilize_reference_1 (e, force)
- tree e;
- int force;
-{
- register enum tree_code code = TREE_CODE (e);
- register tree type = TREE_TYPE (e);
- register tree result;
-
- /* We cannot ignore const expressions because it might be a reference
- to a const array but whose index contains side-effects. But we can
- ignore things that are actual constant or that already have been
- handled by this function. */
-
- if (TREE_CONSTANT (e) || code == SAVE_EXPR)
- return e;
-
- switch (TREE_CODE_CLASS (code))
- {
- case 'x':
- case 't':
- case 'd':
- case 'b':
- case '<':
- case 's':
- case 'e':
- case 'r':
- if (TREE_SIDE_EFFECTS (e) || force)
- return save_expr (e);
- return e;
-
- case 'c':
- /* Constants need no processing. In fact, we should never reach
- here. */
- return e;
-
- case '2':
- /* Division is slow and tends to be compiled with jumps,
- especially the division by powers of 2 that is often
- found inside of an array reference. So do it just once. */
- if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
- || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
- || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
- || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
- return save_expr (e);
- /* Recursively stabilize each operand. */
- result = build (code, type,
- gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), force),
- gnat_stabilize_reference_1 (TREE_OPERAND (e, 1), force));
- break;
-
- case '1':
- /* Recursively stabilize each operand. */
- result = build1 (code, type,
- gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
- force));
- break;
-
- default:
- abort ();
- }
-
- TREE_READONLY (result) = TREE_READONLY (e);
- return result;
-}
-\f
-/* GNAT_UNIT is the Defining_Identifier for some package or subprogram,
- either a spec or a body, BODY_P says which. If needed, make a function
- to be the elaboration routine for that object and perform the elaborations
- in GNU_ELAB_LIST.
-
- Return 1 if we didn't need an elaboration function, zero otherwise. */
-
-static int
-build_unit_elab (gnat_unit, body_p, gnu_elab_list)
- Entity_Id gnat_unit;
- int body_p;
- tree gnu_elab_list;
-{
- tree gnu_decl;
- rtx insn;
- int result = 1;
-
- /* If we have nothing to do, return. */
- if (gnu_elab_list == 0)
- return 1;
-
- /* Set our file and line number to that of the object and set up the
- elaboration routine. */
- gnu_decl = create_subprog_decl (create_concat_name (gnat_unit,
- body_p ?
- "elabb" : "elabs"),
- NULL_TREE, void_ftype, NULL_TREE, 0, 1, 0,
- 0);
- DECL_ELABORATION_PROC_P (gnu_decl) = 1;
-
- begin_subprog_body (gnu_decl);
- set_lineno (gnat_unit, 1);
- pushlevel (0);
- gnu_block_stack = tree_cons (NULL_TREE, NULL_TREE, gnu_block_stack);
- expand_start_bindings (0);
-
- /* Emit the assignments for the elaborations we have to do. If there
- is no destination, this is just a call to execute some statement
- that was placed within the declarative region. But first save a
- pointer so we can see if any insns were generated. */
-
- insn = get_last_insn ();
-
- for (; gnu_elab_list; gnu_elab_list = TREE_CHAIN (gnu_elab_list))
- if (TREE_PURPOSE (gnu_elab_list) == NULL_TREE)
- {
- if (TREE_VALUE (gnu_elab_list) != 0)
- expand_expr_stmt (TREE_VALUE (gnu_elab_list));
- }
- else
- {
- tree lhs = TREE_PURPOSE (gnu_elab_list);
-
- input_filename = DECL_SOURCE_FILE (lhs);
- lineno = DECL_SOURCE_LINE (lhs);
-
- /* If LHS has a padded type, convert it to the unpadded type
- so the assignment is done properly. */
- if (TREE_CODE (TREE_TYPE (lhs)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (lhs)))
- lhs = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (lhs))), lhs);
-
- emit_line_note (input_filename, lineno);
- expand_expr_stmt (build_binary_op (MODIFY_EXPR, NULL_TREE,
- TREE_PURPOSE (gnu_elab_list),
- TREE_VALUE (gnu_elab_list)));
- }
-
- /* See if any non-NOTE insns were generated. */
- for (insn = NEXT_INSN (insn); insn; insn = NEXT_INSN (insn))
- if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
- {
- result = 0;
- break;
- }
-
- expand_end_bindings (getdecls (), kept_level_p (), 0);
- poplevel (kept_level_p (), 1, 0);
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
- end_subprog_body ();
-
- /* If there were no insns, we don't need an elab routine. It would
- be nice to not output this one, but there's no good way to do that. */
- return result;
-}
-\f
-extern char *__gnat_to_canonical_file_spec PARAMS ((char *));
-
-/* Determine the input_filename and the lineno from the source location
- (Sloc) of GNAT_NODE node. Set the global variable input_filename and
- lineno. If WRITE_NOTE_P is true, emit a line number note. */
-
-void
-set_lineno (gnat_node, write_note_p)
- Node_Id gnat_node;
- int write_note_p;
-{
- Source_Ptr source_location = Sloc (gnat_node);
-
- /* If node not from source code, ignore. */
- if (source_location < 0)
- return;
-
- /* Use the identifier table to make a hashed, permanent copy of the filename,
- since the name table gets reallocated after Gigi returns but before all
- the debugging information is output. The call to
- __gnat_to_canonical_file_spec translates filenames from pragmas
- Source_Reference that contain host style syntax not understood by gdb. */
- input_filename
- = IDENTIFIER_POINTER
- (get_identifier
- (__gnat_to_canonical_file_spec
- (Get_Name_String
- (Debug_Source_Name (Get_Source_File_Index (source_location))))));
-
- /* ref_filename is the reference file name as given by sinput (i.e no
- directory) */
- ref_filename
- = IDENTIFIER_POINTER
- (get_identifier
- (Get_Name_String
- (Reference_Name (Get_Source_File_Index (source_location)))));;
- lineno = Get_Logical_Line_Number (source_location);
-
- if (write_note_p)
- emit_line_note (input_filename, lineno);
-}
-\f
-/* Post an error message. MSG is the error message, properly annotated.
- NODE is the node at which to post the error and the node to use for the
- "&" substitution. */
-
-void
-post_error (msg, node)
- const char *msg;
- Node_Id node;
-{
- String_Template temp;
- Fat_Pointer fp;
-
- temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
- fp.Array = msg, fp.Bounds = &temp;
- if (Present (node))
- Error_Msg_N (fp, node);
-}
-
-/* Similar, but NODE is the node at which to post the error and ENT
- is the node to use for the "&" substitution. */
-
-void
-post_error_ne (msg, node, ent)
- const char *msg;
- Node_Id node;
- Entity_Id ent;
-{
- String_Template temp;
- Fat_Pointer fp;
-
- temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
- fp.Array = msg, fp.Bounds = &temp;
- if (Present (node))
- Error_Msg_NE (fp, node, ent);
-}
-
-/* Similar, but NODE is the node at which to post the error, ENT is the node
- to use for the "&" substitution, and N is the number to use for the ^. */
-
-void
-post_error_ne_num (msg, node, ent, n)
- const char *msg;
- Node_Id node;
- Entity_Id ent;
- int n;
-{
- String_Template temp;
- Fat_Pointer fp;
-
- temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
- fp.Array = msg, fp.Bounds = &temp;
- Error_Msg_Uint_1 = UI_From_Int (n);
-
- if (Present (node))
- Error_Msg_NE (fp, node, ent);
-}
-\f
-/* Similar to post_error_ne_num, but T is a GCC tree representing the
- number to write. If the tree represents a constant that fits within
- a host integer, the text inside curly brackets in MSG will be output
- (presumably including a '^'). Otherwise that text will not be output
- and the text inside square brackets will be output instead. */
-
-void
-post_error_ne_tree (msg, node, ent, t)
- const char *msg;
- Node_Id node;
- Entity_Id ent;
- tree t;
-{
- char *newmsg = alloca (strlen (msg) + 1);
- String_Template temp = {1, 0};
- Fat_Pointer fp;
- char start_yes, end_yes, start_no, end_no;
- const char *p;
- char *q;
-
- fp.Array = newmsg, fp.Bounds = &temp;
-
- if (host_integerp (t, 1)
-#if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_INT
- && compare_tree_int (t, 1 << (HOST_BITS_PER_INT - 2)) < 0
-#endif
- )
- {
- Error_Msg_Uint_1 = UI_From_Int (tree_low_cst (t, 1));
- start_yes = '{', end_yes = '}', start_no = '[', end_no = ']';
- }
- else
- start_yes = '[', end_yes = ']', start_no = '{', end_no = '}';
-
- for (p = msg, q = newmsg; *p != 0; p++)
- {
- if (*p == start_yes)
- for (p++; *p != end_yes; p++)
- *q++ = *p;
- else if (*p == start_no)
- for (p++; *p != end_no; p++)
- ;
- else
- *q++ = *p;
- }
-
- *q = 0;
-
- temp.High_Bound = strlen (newmsg);
- if (Present (node))
- Error_Msg_NE (fp, node, ent);
-}
-
-/* Similar to post_error_ne_tree, except that NUM is a second
- integer to write in the message. */
-
-void
-post_error_ne_tree_2 (msg, node, ent, t, num)
- const char *msg;
- Node_Id node;
- Entity_Id ent;
- tree t;
- int num;
-{
- Error_Msg_Uint_2 = UI_From_Int (num);
- post_error_ne_tree (msg, node, ent, t);
-}
-
-/* Set the node for a second '&' in the error message. */
-
-void
-set_second_error_entity (e)
- Entity_Id e;
-{
- Error_Msg_Node_2 = e;
-}
-\f
-/* Signal abort, with "Gigi abort" as the error label, and error_gnat_node
- as the relevant node that provides the location info for the error */
-
-void
-gigi_abort (code)
- int code;
-{
- String_Template temp = {1, 10};
- Fat_Pointer fp;
-
- fp.Array = "Gigi abort", fp.Bounds = &temp;
-
- Current_Error_Node = error_gnat_node;
- Compiler_Abort (fp, code);
-}
-\f
-/* Initialize the table that maps GNAT codes to GCC codes for simple
- binary and unary operations. */
-
-void
-init_code_table ()
-{
- gnu_codes[N_And_Then] = TRUTH_ANDIF_EXPR;
- gnu_codes[N_Or_Else] = TRUTH_ORIF_EXPR;
-
- gnu_codes[N_Op_And] = TRUTH_AND_EXPR;
- gnu_codes[N_Op_Or] = TRUTH_OR_EXPR;
- gnu_codes[N_Op_Xor] = TRUTH_XOR_EXPR;
- gnu_codes[N_Op_Eq] = EQ_EXPR;
- gnu_codes[N_Op_Ne] = NE_EXPR;
- gnu_codes[N_Op_Lt] = LT_EXPR;
- gnu_codes[N_Op_Le] = LE_EXPR;
- gnu_codes[N_Op_Gt] = GT_EXPR;
- gnu_codes[N_Op_Ge] = GE_EXPR;
- gnu_codes[N_Op_Add] = PLUS_EXPR;
- gnu_codes[N_Op_Subtract] = MINUS_EXPR;
- gnu_codes[N_Op_Multiply] = MULT_EXPR;
- gnu_codes[N_Op_Mod] = FLOOR_MOD_EXPR;
- gnu_codes[N_Op_Rem] = TRUNC_MOD_EXPR;
- gnu_codes[N_Op_Minus] = NEGATE_EXPR;
- gnu_codes[N_Op_Abs] = ABS_EXPR;
- gnu_codes[N_Op_Not] = TRUTH_NOT_EXPR;
- gnu_codes[N_Op_Rotate_Left] = LROTATE_EXPR;
- gnu_codes[N_Op_Rotate_Right] = RROTATE_EXPR;
- gnu_codes[N_Op_Shift_Left] = LSHIFT_EXPR;
- gnu_codes[N_Op_Shift_Right] = RSHIFT_EXPR;
- gnu_codes[N_Op_Shift_Right_Arithmetic] = RSHIFT_EXPR;
-}
projects / msp430-gcc.git / blobdiff