+++ /dev/null
-/****************************************************************************
- * *
- * GNAT COMPILER COMPONENTS *
- * *
- * D E C L *
- * *
- * C Implementation File *
- * *
- * $Revision: 1.9.10.1 $
- * *
- * 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 "flags.h"
-#include "toplev.h"
-#include "convert.h"
-#include "ggc.h"
-#include "obstack.h"
-
-#include "ada.h"
-#include "types.h"
-#include "atree.h"
-#include "elists.h"
-#include "namet.h"
-#include "nlists.h"
-#include "repinfo.h"
-#include "snames.h"
-#include "stringt.h"
-#include "uintp.h"
-#include "fe.h"
-#include "sinfo.h"
-#include "einfo.h"
-#include "ada-tree.h"
-#include "gigi.h"
-
-/* Setting this to 1 suppresses hashing of types. */
-extern int debug_no_type_hash;
-
-/* Provide default values for the macros controlling stack checking.
- This is copied from GCC's expr.h. */
-
-#ifndef STACK_CHECK_BUILTIN
-#define STACK_CHECK_BUILTIN 0
-#endif
-#ifndef STACK_CHECK_PROBE_INTERVAL
-#define STACK_CHECK_PROBE_INTERVAL 4096
-#endif
-#ifndef STACK_CHECK_MAX_FRAME_SIZE
-#define STACK_CHECK_MAX_FRAME_SIZE \
- (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
-#endif
-#ifndef STACK_CHECK_MAX_VAR_SIZE
-#define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
-#endif
-
-/* These two variables are used to defer recursively expanding incomplete
- types while we are processing a record or subprogram type. */
-
-static int defer_incomplete_level = 0;
-static struct incomplete
-{
- struct incomplete *next;
- tree old_type;
- Entity_Id full_type;
-} *defer_incomplete_list = 0;
-
-static tree substitution_list PARAMS ((Entity_Id, Entity_Id,
- tree, int));
-static int allocatable_size_p PARAMS ((tree, int));
-static struct attrib *build_attr_list PARAMS ((Entity_Id));
-static tree elaborate_expression PARAMS ((Node_Id, Entity_Id, tree,
- int, int, int));
-static tree elaborate_expression_1 PARAMS ((Node_Id, Entity_Id, tree,
- tree, int, int));
-static tree make_packable_type PARAMS ((tree));
-static tree maybe_pad_type PARAMS ((tree, tree, unsigned int,
- Entity_Id, const char *, int,
- int, int));
-static tree gnat_to_gnu_field PARAMS ((Entity_Id, tree, int, int));
-static void components_to_record PARAMS ((tree, Node_Id, tree, int,
- int, tree *, int, int));
-static int compare_field_bitpos PARAMS ((const PTR, const PTR));
-static Uint annotate_value PARAMS ((tree));
-static void annotate_rep PARAMS ((Entity_Id, tree));
-static tree compute_field_positions PARAMS ((tree, tree, tree, tree));
-static tree validate_size PARAMS ((Uint, tree, Entity_Id,
- enum tree_code, int, int));
-static void set_rm_size PARAMS ((Uint, tree, Entity_Id));
-static tree make_type_from_size PARAMS ((tree, tree, int));
-static unsigned int validate_alignment PARAMS ((Uint, Entity_Id,
- unsigned int));
-static void check_ok_for_atomic PARAMS ((tree, Entity_Id, int));
-\f
-/* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
- GCC type corresponding to that entity. GNAT_ENTITY is assumed to
- refer to an Ada type. */
-
-tree
-gnat_to_gnu_type (gnat_entity)
- Entity_Id gnat_entity;
-{
- tree gnu_decl;
-
- /* Convert the ada entity type into a GCC TYPE_DECL node. */
- gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
- if (TREE_CODE (gnu_decl) != TYPE_DECL)
- gigi_abort (101);
-
- return TREE_TYPE (gnu_decl);
-}
-\f
-/* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
- entity, this routine returns the equivalent GCC tree for that entity
- (an ..._DECL node) and associates the ..._DECL node with the input GNAT
- defining identifier.
-
- If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
- initial value (in GCC tree form). This is optional for variables.
- For renamed entities, GNU_EXPR gives the object being renamed.
-
- DEFINITION is nonzero if this call is intended for a definition. This is
- used for separate compilation where it necessary to know whether an
- external declaration or a definition should be created if the GCC equivalent
- was not created previously. The value of 1 is normally used for a non-zero
- DEFINITION, but a value of 2 is used in special circumstances, defined in
- the code. */
-
-tree
-gnat_to_gnu_entity (gnat_entity, gnu_expr, definition)
- Entity_Id gnat_entity;
- tree gnu_expr;
- int definition;
-{
- tree gnu_entity_id;
- tree gnu_type = 0;
- /* Contains the gnu XXXX_DECL tree node which is equivalent to the input
- GNAT tree. This node will be associated with the GNAT node by calling
- the save_gnu_tree routine at the end of the `switch' statement. */
- tree gnu_decl = 0;
- /* Nonzero if we have already saved gnu_decl as a gnat association. */
- int saved = 0;
- /* Nonzero if we incremented defer_incomplete_level. */
- int this_deferred = 0;
- /* Nonzero if we incremented force_global. */
- int this_global = 0;
- /* Nonzero if we should check to see if elaborated during processing. */
- int maybe_present = 0;
- /* Nonzero if we made GNU_DECL and its type here. */
- int this_made_decl = 0;
- struct attrib *attr_list = 0;
- int debug_info_p = (Needs_Debug_Info (gnat_entity)
- || debug_info_level == DINFO_LEVEL_VERBOSE);
- Entity_Kind kind = Ekind (gnat_entity);
- Entity_Id gnat_temp;
- unsigned int esize
- = ((Known_Esize (gnat_entity)
- && UI_Is_In_Int_Range (Esize (gnat_entity)))
- ? MIN (UI_To_Int (Esize (gnat_entity)),
- IN (kind, Float_Kind)
- ? LONG_DOUBLE_TYPE_SIZE
- : IN (kind, Access_Kind) ? POINTER_SIZE * 2
- : LONG_LONG_TYPE_SIZE)
- : LONG_LONG_TYPE_SIZE);
- tree gnu_size = 0;
- int imported_p
- = ((Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity)))
- || From_With_Type (gnat_entity));
- unsigned int align = 0;
-
- /* Since a use of an Itype is a definition, process it as such if it
- is not in a with'ed unit. */
-
- if (! definition && Is_Itype (gnat_entity)
- && ! present_gnu_tree (gnat_entity)
- && In_Extended_Main_Code_Unit (gnat_entity))
- {
- /* Ensure that we are in a subprogram mentioned in the Scope
- chain of this entity, our current scope is global,
- or that we encountered a task or entry (where we can't currently
- accurately check scoping). */
- if (current_function_decl == 0
- || DECL_ELABORATION_PROC_P (current_function_decl))
- {
- process_type (gnat_entity);
- return get_gnu_tree (gnat_entity);
- }
-
- for (gnat_temp = Scope (gnat_entity);
- Present (gnat_temp); gnat_temp = Scope (gnat_temp))
- {
- if (Is_Type (gnat_temp))
- gnat_temp = Underlying_Type (gnat_temp);
-
- if (Ekind (gnat_temp) == E_Subprogram_Body)
- gnat_temp
- = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
-
- if (IN (Ekind (gnat_temp), Subprogram_Kind)
- && Present (Protected_Body_Subprogram (gnat_temp)))
- gnat_temp = Protected_Body_Subprogram (gnat_temp);
-
- if (Ekind (gnat_temp) == E_Entry
- || Ekind (gnat_temp) == E_Entry_Family
- || Ekind (gnat_temp) == E_Task_Type
- || (IN (Ekind (gnat_temp), Subprogram_Kind)
- && present_gnu_tree (gnat_temp)
- && (current_function_decl
- == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
- {
- process_type (gnat_entity);
- return get_gnu_tree (gnat_entity);
- }
- }
-
- /* gigi abort 122 means that the entity "gnat_entity" has an incorrect
- scope, i.e. that its scope does not correspond to the subprogram
- in which it is declared */
- gigi_abort (122);
- }
-
- /* If this is entity 0, something went badly wrong. */
- if (gnat_entity == 0)
- gigi_abort (102);
-
- /* If we've already processed this entity, return what we got last time.
- If we are defining the node, we should not have already processed it.
- In that case, we will abort below when we try to save a new GCC tree for
- this object. We also need to handle the case of getting a dummy type
- when a Full_View exists. */
-
- if (present_gnu_tree (gnat_entity)
- && (! definition
- || (Is_Type (gnat_entity) && imported_p)))
- {
- gnu_decl = get_gnu_tree (gnat_entity);
-
- if (TREE_CODE (gnu_decl) == TYPE_DECL
- && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
- && IN (kind, Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_entity)))
- {
- gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
- NULL_TREE, 0);
-
- save_gnu_tree (gnat_entity, NULL_TREE, 0);
- save_gnu_tree (gnat_entity, gnu_decl, 0);
- }
-
- return gnu_decl;
- }
-
- /* If this is a numeric or enumeral type, or an access type, a nonzero
- Esize must be specified unless it was specified by the programmer. */
- if ((IN (kind, Numeric_Kind) || IN (kind, Enumeration_Kind)
- || (IN (kind, Access_Kind)
- && kind != E_Access_Protected_Subprogram_Type
- && kind != E_Access_Subtype))
- && Unknown_Esize (gnat_entity)
- && ! Has_Size_Clause (gnat_entity))
- gigi_abort (109);
-
- /* Likewise, RM_Size must be specified for all discrete and fixed-point
- types. */
- if (IN (kind, Discrete_Or_Fixed_Point_Kind)
- && Unknown_RM_Size (gnat_entity))
- gigi_abort (123);
-
- /* Get the name of the entity and set up the line number and filename of
- the original definition for use in any decl we make. */
-
- gnu_entity_id = get_entity_name (gnat_entity);
- set_lineno (gnat_entity, 0);
-
- /* If we get here, it means we have not yet done anything with this
- entity. If we are not defining it here, it must be external,
- otherwise we should have defined it already. */
- if (! definition && ! Is_Public (gnat_entity)
- && ! type_annotate_only
- && kind != E_Discriminant && kind != E_Component
- && kind != E_Label
- && ! (kind == E_Constant && Present (Full_View (gnat_entity)))
-#if 1
- && !IN (kind, Type_Kind)
-#endif
- )
- gigi_abort (116);
-
- /* For cases when we are not defining (i.e., we are referencing from
- another compilation unit) Public entities, show we are at global level
- for the purpose of computing sizes. Don't do this for components or
- discriminants since the relevant test is whether or not the record is
- being defined. */
- if (! definition && Is_Public (gnat_entity)
- && ! Is_Statically_Allocated (gnat_entity)
- && kind != E_Discriminant && kind != E_Component)
- force_global++, this_global = 1;
-
- /* Handle any attributes. */
- if (Has_Gigi_Rep_Item (gnat_entity))
- attr_list = build_attr_list (gnat_entity);
-
- switch (kind)
- {
- case E_Constant:
- /* If this is a use of a deferred constant, get its full
- declaration. */
- if (! definition && Present (Full_View (gnat_entity)))
- {
- gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
- gnu_expr, definition);
- saved = 1;
- break;
- }
-
- /* If we have an external constant that we are not defining,
- get the expression that is was defined to represent. We
- may throw that expression away later if it is not a
- constant. */
- if (! definition
- && Present (Expression (Declaration_Node (gnat_entity)))
- && ! No_Initialization (Declaration_Node (gnat_entity)))
- gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
-
- /* Ignore deferred constant definitions; they are processed fully in the
- front-end. For deferred constant references, get the full
- definition. On the other hand, constants that are renamings are
- handled like variable renamings. If No_Initialization is set, this is
- not a deferred constant but a constant whose value is built
- manually. */
-
- if (definition && gnu_expr == 0
- && ! No_Initialization (Declaration_Node (gnat_entity))
- && No (Renamed_Object (gnat_entity)))
- {
- gnu_decl = error_mark_node;
- saved = 1;
- break;
- }
- else if (! definition && IN (kind, Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_entity)))
- {
- gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
- NULL_TREE, 0);
- saved = 1;
- break;
- }
-
- goto object;
-
- case E_Exception:
- /* If this is not a VMS exception, treat it as a normal object.
- Otherwise, make an object at the specific address of character
- type, point to it, and convert it to integer, and mask off
- the lower 3 bits. */
- if (! Is_VMS_Exception (gnat_entity))
- goto object;
-
- /* Allocate the global object that we use to get the value of the
- exception. */
- gnu_decl = create_var_decl (gnu_entity_id,
- (Present (Interface_Name (gnat_entity))
- ? create_concat_name (gnat_entity, 0)
- : NULL_TREE),
- char_type_node, NULL_TREE, 0, 0, 1, 1,
- 0);
-
- /* Now return the expression giving the desired value. */
- gnu_decl
- = build_binary_op (BIT_AND_EXPR, integer_type_node,
- convert (integer_type_node,
- build_unary_op (ADDR_EXPR, NULL_TREE,
- gnu_decl)),
- build_unary_op (NEGATE_EXPR, integer_type_node,
- build_int_2 (7, 0)));
-
- save_gnu_tree (gnat_entity, gnu_decl, 1);
- saved = 1;
- break;
-
- case E_Discriminant:
- case E_Component:
- {
- /* The GNAT record where the component was defined. */
- Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
-
- /* If the variable is an inherited record component (in the case of
- extended record types), just return the inherited entity, which
- must be a FIELD_DECL. Likewise for discriminants.
- For discriminants of untagged records which have explicit
- girder discriminants, return the entity for the corresponding
- girder discriminant. Also use Original_Record_Component
- if the record has a private extension. */
-
- if ((Base_Type (gnat_record) == gnat_record
- || Ekind (Scope (gnat_entity)) == E_Record_Subtype_With_Private
- || Ekind (Scope (gnat_entity)) == E_Record_Type_With_Private)
- && Present (Original_Record_Component (gnat_entity))
- && Original_Record_Component (gnat_entity) != gnat_entity)
- {
- gnu_decl
- = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
- gnu_expr, definition);
- saved = 1;
- break;
- }
-
- /* If the enclosing record has explicit girder discriminants,
- then it is an untagged record. If the Corresponding_Discriminant
- is not empty then this must be a renamed discriminant and its
- Original_Record_Component must point to the corresponding explicit
- girder discriminant (i.e., we should have taken the previous
- branch). */
-
- else if (Present (Corresponding_Discriminant (gnat_entity))
- && Is_Tagged_Type (gnat_record))
- {
- /* A tagged record has no explicit girder discriminants. */
-
- if (First_Discriminant (gnat_record)
- != First_Girder_Discriminant (gnat_record))
- gigi_abort (119);
-
- gnu_decl
- = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
- gnu_expr, definition);
- saved = 1;
- break;
- }
-
- /* If the enclosing record has explicit girder discriminants,
- then it is an untagged record. If the Corresponding_Discriminant
- is not empty then this must be a renamed discriminant and its
- Original_Record_Component must point to the corresponding explicit
- girder discriminant (i.e., we should have taken the first
- branch). */
-
- else if (Present (Corresponding_Discriminant (gnat_entity))
- && (First_Discriminant (gnat_record)
- != First_Girder_Discriminant (gnat_record)))
- gigi_abort (120);
-
- /* Otherwise, if we are not defining this and we have no GCC type
- for the containing record, make one for it. Then we should
- have made our own equivalent. */
- else if (! definition && ! present_gnu_tree (gnat_record))
- {
- /* ??? If this is in a record whose scope is a protected
- type and we have an Original_Record_Component, use it.
- This is a workaround for major problems in protected type
- handling. */
- if (Is_Protected_Type (Scope (Scope (gnat_entity)))
- && Present (Original_Record_Component (gnat_entity)))
- {
- gnu_decl
- = gnat_to_gnu_entity (Original_Record_Component
- (gnat_entity),
- gnu_expr, definition);
- saved = 1;
- break;
- }
-
- gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
- gnu_decl = get_gnu_tree (gnat_entity);
- saved = 1;
- break;
- }
-
- /* Here we have no GCC type and this is a reference rather than a
- definition. This should never happen. Most likely the cause is a
- reference before declaration in the gnat tree for gnat_entity. */
- else
- gigi_abort (103);
- }
-
- case E_Loop_Parameter:
- case E_Out_Parameter:
- case E_Variable:
-
- /* Simple variables, loop variables, OUT parameters, and exceptions. */
- object:
- {
- int used_by_ref = 0;
- int const_flag
- = ((kind == E_Constant || kind == E_Variable)
- && ! Is_Statically_Allocated (gnat_entity)
- && Is_True_Constant (gnat_entity)
- && (((Nkind (Declaration_Node (gnat_entity))
- == N_Object_Declaration)
- && Present (Expression (Declaration_Node (gnat_entity))))
- || Present (Renamed_Object (gnat_entity))));
- int inner_const_flag = const_flag;
- int static_p = Is_Statically_Allocated (gnat_entity);
- tree gnu_ext_name = NULL_TREE;
-
- if (Present (Renamed_Object (gnat_entity)) && ! definition)
- {
- if (kind == E_Exception)
- gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
- NULL_TREE, 0);
- else
- gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
- }
-
- /* Get the type after elaborating the renamed object. */
- gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
-
- /* If this is a loop variable, its type should be the base type.
- This is because the code for processing a loop determines whether
- a normal loop end test can be done by comparing the bounds of the
- loop against those of the base type, which is presumed to be the
- size used for computation. But this is not correct when the size
- of the subtype is smaller than the type. */
- if (kind == E_Loop_Parameter)
- gnu_type = get_base_type (gnu_type);
-
- /* Reject non-renamed objects whose types are unconstrained arrays or
- any object whose type is a dummy type or VOID_TYPE. */
-
- if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
- && No (Renamed_Object (gnat_entity)))
- || TYPE_IS_DUMMY_P (gnu_type)
- || TREE_CODE (gnu_type) == VOID_TYPE)
- {
- if (type_annotate_only)
- return error_mark_node;
- else
- gigi_abort (104);
- }
-
- /* If we are defining the object, see if it has a Size value and
- validate it if so. Then get the new type, if any. */
- if (definition)
- gnu_size = validate_size (Esize (gnat_entity), gnu_type,
- gnat_entity, VAR_DECL, 0,
- Has_Size_Clause (gnat_entity));
-
- if (gnu_size != 0)
- {
- gnu_type
- = make_type_from_size (gnu_type, gnu_size,
- Has_Biased_Representation (gnat_entity));
-
- if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
- gnu_size = 0;
- }
-
- /* If this object has self-referential size, it must be a record with
- a default value. We are supposed to allocate an object of the
- maximum size in this case unless it is a constant with an
- initializing expression, in which case we can get the size from
- that. Note that the resulting size may still be a variable, so
- this may end up with an indirect allocation. */
-
- if (No (Renamed_Object (gnat_entity))
- && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (gnu_type)))
- {
- if (gnu_expr != 0 && kind == E_Constant)
- {
- gnu_size = TYPE_SIZE (TREE_TYPE (gnu_expr));
- if (TREE_CODE (gnu_size) != INTEGER_CST
- && contains_placeholder_p (gnu_size))
- {
- tree gnu_temp = gnu_expr;
-
- /* Strip off any conversions in GNU_EXPR since
- they can't be changing the size to allocate. */
- while (TREE_CODE (gnu_temp) == UNCHECKED_CONVERT_EXPR)
- gnu_temp = TREE_OPERAND (gnu_temp, 0);
-
- gnu_size = TYPE_SIZE (TREE_TYPE (gnu_temp));
- if (TREE_CODE (gnu_size) != INTEGER_CST
- && contains_placeholder_p (gnu_size))
- gnu_size = build (WITH_RECORD_EXPR, bitsizetype,
- gnu_size, gnu_temp);
- }
- }
-
- /* We may have no GNU_EXPR because No_Initialization is
- set even though there's an Expression. */
- else if (kind == E_Constant
- && (Nkind (Declaration_Node (gnat_entity))
- == N_Object_Declaration)
- && Present (Expression (Declaration_Node (gnat_entity))))
- gnu_size
- = TYPE_SIZE (gnat_to_gnu_type
- (Etype
- (Expression (Declaration_Node (gnat_entity)))));
- else
- gnu_size = max_size (TYPE_SIZE (gnu_type), 1);
- }
-
- /* If the size is zero bytes, make it one byte since some linkers
- have trouble with zero-sized objects. But if this will have a
- template, that will make it nonzero. */
- if (((gnu_size != 0 && integer_zerop (gnu_size))
- || (TYPE_SIZE (gnu_type) != 0
- && integer_zerop (TYPE_SIZE (gnu_type))))
- && (! Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
- || ! Is_Array_Type (Etype (gnat_entity))))
- gnu_size = bitsize_unit_node;
-
- /* If an alignment is specified, use it if valid. Note that
- exceptions are objects but don't have alignments. */
- if (kind != E_Exception && Known_Alignment (gnat_entity))
- {
- if (No (Alignment (gnat_entity)))
- gigi_abort (125);
-
- align
- = validate_alignment (Alignment (gnat_entity), gnat_entity,
- TYPE_ALIGN (gnu_type));
- }
-
- /* If this is an atomic object with no specified size and alignment,
- but where the size of the type is a constant, set the alignment to
- the lowest power of two greater than the size, or to the
- biggest meaningful alignment, whichever is smaller. */
-
- if (Is_Atomic (gnat_entity) && gnu_size == 0 && align == 0
- && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
- {
- if (! host_integerp (TYPE_SIZE (gnu_type), 1)
- || 0 <= compare_tree_int (TYPE_SIZE (gnu_type),
- BIGGEST_ALIGNMENT))
- align = BIGGEST_ALIGNMENT;
- else
- align = ((unsigned int) 1
- << (floor_log2 (tree_low_cst
- (TYPE_SIZE (gnu_type), 1) - 1)
- + 1));
- }
-
-#ifdef MINIMUM_ATOMIC_ALIGNMENT
- /* If the size is a constant and no alignment is specified, force
- the alignment to be the minimum valid atomic alignment. The
- restriction on constant size avoids problems with variable-size
- temporaries; if the size is variable, there's no issue with
- atomic access. Also don't do this for a constant, since it isn't
- necessary and can interfere with constant replacement. Finally,
- do not do it for Out parameters since that creates an
- size inconsistency with In parameters. */
- if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
- && ! FLOAT_TYPE_P (gnu_type)
- && ! const_flag && No (Renamed_Object (gnat_entity))
- && ! imported_p && No (Address_Clause (gnat_entity))
- && kind != E_Out_Parameter
- && (gnu_size != 0 ? TREE_CODE (gnu_size) == INTEGER_CST
- : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
- align = MINIMUM_ATOMIC_ALIGNMENT;
-#endif
-
- /* If the object is set to have atomic components, find the component
- type and validate it.
-
- ??? Note that we ignore Has_Volatile_Components on objects; it's
- not at all clear what to do in that case. */
-
- if (Has_Atomic_Components (gnat_entity))
- {
- tree gnu_inner
- = (TREE_CODE (gnu_type) == ARRAY_TYPE
- ? TREE_TYPE (gnu_type) : gnu_type);
-
- while (TREE_CODE (gnu_inner) == ARRAY_TYPE
- && TYPE_MULTI_ARRAY_P (gnu_inner))
- gnu_inner = TREE_TYPE (gnu_inner);
-
- check_ok_for_atomic (gnu_inner, gnat_entity, 1);
- }
-
- /* Make a new type with the desired size and alignment, if needed. */
- gnu_type = maybe_pad_type (gnu_type, gnu_size, align,
- gnat_entity, "PAD", 0, definition, 1);
-
- /* Make a volatile version of this object's type if we are to
- make the object volatile. Note that 13.3(19) says that we
- should treat other types of objects as volatile as well. */
- if ((Is_Volatile (gnat_entity)
- || Is_Exported (gnat_entity)
- || Is_Imported (gnat_entity)
- || Present (Address_Clause (gnat_entity)))
- && ! TYPE_VOLATILE (gnu_type))
- gnu_type = build_qualified_type (gnu_type,
- (TYPE_QUALS (gnu_type)
- | TYPE_QUAL_VOLATILE));
-
- /* If this is an aliased object with an unconstrained nominal subtype,
- make a type that includes the template. */
- if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
- && Is_Array_Type (Etype (gnat_entity))
- && ! type_annotate_only)
- {
- tree gnu_fat
- = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
- tree gnu_temp_type
- = TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_fat))));
-
- gnu_type
- = build_unc_object_type (gnu_temp_type, gnu_type,
- concat_id_with_name (gnu_entity_id,
- "UNC"));
- }
-
- /* Convert the expression to the type of the object except in the
- case where the object's type is unconstrained or the object's type
- is a padded record whose field is of self-referential size. In
- the former case, converting will generate unnecessary evaluations
- of the CONSTRUCTOR to compute the size and in the latter case, we
- want to only copy the actual data. */
- if (gnu_expr != 0
- && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
- && ! (TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (gnu_type)))
- && ! (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_type)
- && (contains_placeholder_p
- (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
- gnu_expr = convert (gnu_type, gnu_expr);
-
- /* See if this is a renaming. If this is a constant renaming,
- treat it as a normal variable whose initial value is what
- is being renamed. We cannot do this if the type is
- unconstrained or class-wide.
-
- Otherwise, if what we are renaming is a reference, we can simply
- return a stabilized version of that reference, after forcing
- any SAVE_EXPRs to be evaluated. But, if this is at global level,
- we can only do this if we know no SAVE_EXPRs will be made.
- Otherwise, make this into a constant pointer to the object we are
- to rename. */
-
- if (Present (Renamed_Object (gnat_entity)))
- {
- /* If the renamed object had padding, strip off the reference
- to the inner object and reset our type. */
- if (TREE_CODE (gnu_expr) == COMPONENT_REF
- && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
- == RECORD_TYPE)
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
- {
- gnu_expr = TREE_OPERAND (gnu_expr, 0);
- gnu_type = TREE_TYPE (gnu_expr);
- }
-
- if (const_flag
- && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
- && TYPE_MODE (gnu_type) != BLKmode
- && Ekind (Etype (gnat_entity)) != E_Class_Wide_Type
- && !Is_Array_Type (Etype (gnat_entity)))
- ;
-
- /* If this is a declaration or reference, we can just use that
- declaration or reference as this entity. */
- else if ((DECL_P (gnu_expr)
- || TREE_CODE_CLASS (TREE_CODE (gnu_expr)) == 'r')
- && ! Materialize_Entity (gnat_entity)
- && (! global_bindings_p ()
- || (staticp (gnu_expr)
- && ! TREE_SIDE_EFFECTS (gnu_expr))))
- {
- set_lineno (gnat_entity, ! global_bindings_p ());
- gnu_decl = gnat_stabilize_reference (gnu_expr, 1);
- save_gnu_tree (gnat_entity, gnu_decl, 1);
- saved = 1;
-
- if (! global_bindings_p ())
- expand_expr_stmt (build1 (CONVERT_EXPR, void_type_node,
- gnu_decl));
- break;
- }
- else
- {
- inner_const_flag = TREE_READONLY (gnu_expr);
- const_flag = 1;
- gnu_type = build_reference_type (gnu_type);
- gnu_expr = build_unary_op (ADDR_EXPR, gnu_type, gnu_expr);
- gnu_size = 0;
- used_by_ref = 1;
- }
- }
-
- /* If this is an aliased object whose nominal subtype is unconstrained,
- the object is a record that contains both the template and
- the object. If there is an initializer, it will have already
- been converted to the right type, but we need to create the
- template if there is no initializer. */
- else if (definition && TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_type)
- && gnu_expr == 0)
- gnu_expr
- = build_constructor
- (gnu_type,
- tree_cons
- (TYPE_FIELDS (gnu_type),
- build_template
- (TREE_TYPE (TYPE_FIELDS (gnu_type)),
- TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))),
- NULL_TREE),
- NULL_TREE));
-
- /* If this is a pointer and it does not have an initializing
- expression, initialize it to NULL. */
- if (definition
- && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
- && gnu_expr == 0)
- gnu_expr = integer_zero_node;
-
- /* If we are defining the object and it has an Address clause we must
- get the address expression from the saved GCC tree for the
- object if the object has a Freeze_Node. Otherwise, we elaborate
- the address expression here since the front-end has guaranteed
- in that case that the elaboration has no effects. Note that
- only the latter mechanism is currently in use. */
- if (definition && Present (Address_Clause (gnat_entity)))
- {
- tree gnu_address
- = (present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity)
- : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
-
- save_gnu_tree (gnat_entity, NULL_TREE, 0);
-
- /* Ignore the size. It's either meaningless or was handled
- above. */
- gnu_size = 0;
- gnu_type = build_reference_type (gnu_type);
- gnu_address = convert (gnu_type, gnu_address);
- used_by_ref = 1;
- const_flag = ! Is_Public (gnat_entity);
-
- /* If we don't have an initializing expression for the underlying
- variable, the initializing expression for the pointer is the
- specified address. Otherwise, we have to make a COMPOUND_EXPR
- to assign both the address and the initial value. */
- if (gnu_expr == 0)
- gnu_expr = gnu_address;
- else
- gnu_expr
- = build (COMPOUND_EXPR, gnu_type,
- build_binary_op
- (MODIFY_EXPR, NULL_TREE,
- build_unary_op (INDIRECT_REF, NULL_TREE,
- gnu_address),
- gnu_expr),
- gnu_address);
- }
-
- /* If it has an address clause and we are not defining it, mark it
- as an indirect object. Likewise for Stdcall objects that are
- imported. */
- if ((! definition && Present (Address_Clause (gnat_entity)))
- || (Is_Imported (gnat_entity)
- && Convention (gnat_entity) == Convention_Stdcall))
- {
- gnu_type = build_reference_type (gnu_type);
- gnu_size = 0;
- used_by_ref = 1;
- }
-
- /* If we are at top level and this object is of variable size,
- make the actual type a hidden pointer to the real type and
- make the initializer be a memory allocation and initialization.
- Likewise for objects we aren't defining (presumed to be
- external references from other packages), but there we do
- not set up an initialization.
-
- If the object's size overflows, make an allocator too, so that
- Storage_Error gets raised. Note that we will never free
- such memory, so we presume it never will get allocated. */
-
- if (! allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
- global_bindings_p () || ! definition
- || static_p)
- || (gnu_size != 0
- && ! allocatable_size_p (gnu_size,
- global_bindings_p () || ! definition
- || static_p)))
- {
- gnu_type = build_reference_type (gnu_type);
- gnu_size = 0;
- used_by_ref = 1;
- const_flag = 1;
-
- /* Get the data part of GNU_EXPR in case this was a
- aliased object whose nominal subtype is unconstrained.
- In that case the pointer above will be a thin pointer and
- build_allocator will automatically make the template and
- constructor already made above. */
-
- if (definition)
- {
- tree gnu_alloc_type = TREE_TYPE (gnu_type);
-
- if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
- {
- gnu_alloc_type
- = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
- gnu_expr
- = build_component_ref
- (gnu_expr, NULL_TREE,
- TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))));
- }
-
- if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
- && TREE_CONSTANT_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
- && ! Is_Imported (gnat_entity))
- post_error ("Storage_Error will be raised at run-time?",
- gnat_entity);
-
- gnu_expr = build_allocator (gnu_alloc_type, gnu_expr,
- gnu_type, 0, 0);
- }
- else
- {
- gnu_expr = 0;
- const_flag = 0;
- }
- }
-
- /* If this object would go into the stack and has an alignment
- larger than the default largest alignment, make a variable
- to hold the "aligning type" with a modified initial value,
- if any, then point to it and make that the value of this
- variable, which is now indirect. */
-
- if (! global_bindings_p () && ! static_p && definition
- && ! imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
- {
- tree gnu_new_type
- = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
- TYPE_SIZE_UNIT (gnu_type));
- tree gnu_new_var;
-
- if (gnu_expr != 0)
- gnu_expr
- = build_constructor (gnu_new_type,
- tree_cons (TYPE_FIELDS (gnu_new_type),
- gnu_expr, NULL_TREE));
- set_lineno (gnat_entity, 1);
- gnu_new_var
- = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
- NULL_TREE, gnu_new_type, gnu_expr,
- 0, 0, 0, 0, 0);
-
- gnu_type = build_reference_type (gnu_type);
- gnu_expr
- = build_unary_op
- (ADDR_EXPR, gnu_type,
- build_component_ref (gnu_new_var, NULL_TREE,
- TYPE_FIELDS (gnu_new_type)));
-
- gnu_size = 0;
- used_by_ref = 1;
- const_flag = 1;
- }
-
- /* Convert the expression to the type of the object except in the
- case where the object's type is unconstrained or the object's type
- is a padded record whose field is of self-referential size. In
- the former case, converting will generate unnecessary evaluations
- of the CONSTRUCTOR to compute the size and in the latter case, we
- want to only copy the actual data. */
- if (gnu_expr != 0
- && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
- && ! (TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (gnu_type)))
- && ! (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_type)
- && (contains_placeholder_p
- (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
- gnu_expr = convert (gnu_type, gnu_expr);
-
- /* This name is external or there was a name specified, use it.
- Don't use the Interface_Name if there is an address clause.
- (see CD30005). */
- if ((Present (Interface_Name (gnat_entity))
- && No (Address_Clause (gnat_entity)))
- || (Is_Public (gnat_entity)
- && (! Is_Imported (gnat_entity) || Is_Exported (gnat_entity))))
- gnu_ext_name = create_concat_name (gnat_entity, 0);
-
- if (const_flag)
- gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
- | TYPE_QUAL_CONST));
-
- /* If this is constant initialized to a static constant and the
- object has an aggregrate type, force it to be statically
- allocated. */
- if (const_flag && gnu_expr && TREE_CONSTANT (gnu_expr)
- && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
- && (AGGREGATE_TYPE_P (gnu_type)
- && ! (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_type))))
- static_p = 1;
-
- set_lineno (gnat_entity, ! global_bindings_p ());
- gnu_decl = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
- gnu_expr, const_flag,
- Is_Public (gnat_entity),
- imported_p || !definition,
- static_p, attr_list);
-
- DECL_BY_REF_P (gnu_decl) = used_by_ref;
- DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
-
- if (definition && DECL_SIZE (gnu_decl) != 0
- && gnu_block_stack != 0
- && TREE_VALUE (gnu_block_stack) != 0
- && (TREE_CODE (DECL_SIZE (gnu_decl)) != INTEGER_CST
- || (flag_stack_check && ! STACK_CHECK_BUILTIN
- && 0 < compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
- STACK_CHECK_MAX_VAR_SIZE))))
- update_setjmp_buf (TREE_VALUE (gnu_block_stack));
-
- /* If this is a public constant or we're not optimizing and we're not
- making a VAR_DECL for it, make one just for export or debugger
- use. Likewise if the address is taken or if the object or type is
- aliased. */
- if (definition && TREE_CODE (gnu_decl) == CONST_DECL
- && (Is_Public (gnat_entity)
- || optimize == 0
- || Address_Taken (gnat_entity)
- || Is_Aliased (gnat_entity)
- || Is_Aliased (Etype (gnat_entity))))
- DECL_CONST_CORRESPONDING_VAR (gnu_decl)
- = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
- gnu_expr, 0, Is_Public (gnat_entity), 0,
- static_p, 0);
-
- if (Is_Atomic (gnat_entity))
- check_ok_for_atomic (gnu_decl, gnat_entity, 0);
-
- /* If this is declared in a block that contains an block with an
- exception handler, we must force this variable in memory to
- suppress an invalid optimization. */
- if (Has_Nested_Block_With_Handler (Scope (gnat_entity)))
- {
- mark_addressable (gnu_decl);
- flush_addressof (gnu_decl);
- }
-
- /* Back-annotate the Alignment of the object if not already in the
- tree. Likewise for Esize if the object is of a constant size.
- But if the "object" is actually a pointer to an object, the
- alignment and size are the same as teh type, so don't back-annotate
- the values for the pointer. */
- if (! used_by_ref && Unknown_Alignment (gnat_entity))
- Set_Alignment (gnat_entity,
- UI_From_Int (DECL_ALIGN (gnu_decl) / BITS_PER_UNIT));
-
- if (! used_by_ref && Unknown_Esize (gnat_entity)
- && DECL_SIZE (gnu_decl) != 0)
- {
- tree gnu_back_size = DECL_SIZE (gnu_decl);
-
- if (TREE_CODE (TREE_TYPE (gnu_decl)) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_decl)))
- gnu_back_size
- = TYPE_SIZE (TREE_TYPE (TREE_CHAIN
- (TYPE_FIELDS (TREE_TYPE (gnu_decl)))));
-
- Set_Esize (gnat_entity, annotate_value (gnu_back_size));
- }
- }
- break;
-
- case E_Void:
- /* Return a TYPE_DECL for "void" that we previously made. */
- gnu_decl = void_type_decl_node;
- break;
-
- case E_Enumeration_Type:
- /* A special case, for the types Character and Wide_Character in
- Standard, we do not list all the literals. So if the literals
- are not specified, make this an unsigned type. */
- if (No (First_Literal (gnat_entity)))
- {
- gnu_type = make_unsigned_type (esize);
- break;
- }
-
- /* Normal case of non-character type, or non-Standard character type */
- {
- /* Here we have a list of enumeral constants in First_Literal.
- We make a CONST_DECL for each and build into GNU_LITERAL_LIST
- the list to be places into TYPE_FIELDS. Each node in the list
- is a TREE_LIST node whose TREE_VALUE is the literal name
- and whose TREE_PURPOSE is the value of the literal.
-
- Esize contains the number of bits needed to represent the enumeral
- type, Type_Low_Bound also points to the first literal and
- Type_High_Bound points to the last literal. */
-
- Entity_Id gnat_literal;
- tree gnu_literal_list = NULL_TREE;
-
- if (Is_Unsigned_Type (gnat_entity))
- gnu_type = make_unsigned_type (esize);
- else
- gnu_type = make_signed_type (esize);
-
- TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
-
- for (gnat_literal = First_Literal (gnat_entity);
- Present (gnat_literal);
- gnat_literal = Next_Literal (gnat_literal))
- {
- tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
- gnu_type);
- tree gnu_literal
- = create_var_decl (get_entity_name (gnat_literal),
- 0, gnu_type, gnu_value, 1, 0, 0, 0, 0);
-
- save_gnu_tree (gnat_literal, gnu_literal, 0);
- gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
- gnu_value, gnu_literal_list);
- }
-
- TYPE_FIELDS (gnu_type) = nreverse (gnu_literal_list);
-
- /* Note that the bounds are updated at the end of this function
- because to avoid an infinite recursion when we get the bounds of
- this type, since those bounds are objects of this type. */
- }
- break;
-
- case E_Signed_Integer_Type:
- case E_Ordinary_Fixed_Point_Type:
- case E_Decimal_Fixed_Point_Type:
- /* For integer types, just make a signed type the appropriate number
- of bits. */
- gnu_type = make_signed_type (esize);
- break;
-
- case E_Modular_Integer_Type:
- /* For modular types, make the unsigned type of the proper number of
- bits and then set up the modulus, if required. */
- {
- enum machine_mode mode;
- tree gnu_modulus;
- tree gnu_high = 0;
-
- if (Is_Packed_Array_Type (gnat_entity))
- esize = UI_To_Int (RM_Size (gnat_entity));
-
- /* Find the smallest mode at least ESIZE bits wide and make a class
- using that mode. */
-
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
- GET_MODE_BITSIZE (mode) < esize;
- mode = GET_MODE_WIDER_MODE (mode))
- ;
-
- gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode));
- TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
- = Is_Packed_Array_Type (gnat_entity);
-
- /* Get the modulus in this type. If it overflows, assume it is because
- it is equal to 2**Esize. Note that there is no overflow checking
- done on unsigned type, so we detect the overflow by looking for
- a modulus of zero, which is otherwise invalid. */
- gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
-
- if (! integer_zerop (gnu_modulus))
- {
- TYPE_MODULAR_P (gnu_type) = 1;
- TYPE_MODULUS (gnu_type) = gnu_modulus;
- gnu_high = fold (build (MINUS_EXPR, gnu_type, gnu_modulus,
- convert (gnu_type, integer_one_node)));
- }
-
- /* If we have to set TYPE_PRECISION different from its natural value,
- make a subtype to do do. Likewise if there is a modulus and
- it is not one greater than TYPE_MAX_VALUE. */
- if (TYPE_PRECISION (gnu_type) != esize
- || (TYPE_MODULAR_P (gnu_type)
- && ! tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high)))
- {
- tree gnu_subtype = make_node (INTEGER_TYPE);
-
- TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
- TREE_TYPE (gnu_subtype) = gnu_type;
- TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type);
- TYPE_MAX_VALUE (gnu_subtype)
- = TYPE_MODULAR_P (gnu_type)
- ? gnu_high : TYPE_MAX_VALUE (gnu_type);
- TYPE_PRECISION (gnu_subtype) = esize;
- TREE_UNSIGNED (gnu_subtype) = 1;
- TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
- TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype)
- = Is_Packed_Array_Type (gnat_entity);
- layout_type (gnu_subtype);
-
- gnu_type = gnu_subtype;
- }
- }
- break;
-
- case E_Signed_Integer_Subtype:
- case E_Enumeration_Subtype:
- case E_Modular_Integer_Subtype:
- case E_Ordinary_Fixed_Point_Subtype:
- case E_Decimal_Fixed_Point_Subtype:
-
- /* For integral subtypes, we make a new INTEGER_TYPE. Note
- that we do not want to call build_range_type since we would
- like each subtype node to be distinct. This will be important
- when memory aliasing is implemented.
-
- The TREE_TYPE field of the INTEGER_TYPE we make points to the
- parent type; this fact is used by the arithmetic conversion
- functions.
-
- We elaborate the Ancestor_Subtype if it is not in the current
- unit and one of our bounds is non-static. We do this to ensure
- consistent naming in the case where several subtypes share the same
- bounds by always elaborating the first such subtype first, thus
- using its name. */
-
- if (definition == 0
- && Present (Ancestor_Subtype (gnat_entity))
- && ! In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
- && (! Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
- || ! Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
- gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
- gnu_expr, definition);
-
- gnu_type = make_node (INTEGER_TYPE);
- if (Is_Packed_Array_Type (gnat_entity))
- {
-
- esize = UI_To_Int (RM_Size (gnat_entity));
- TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
- }
-
- TYPE_PRECISION (gnu_type) = esize;
- TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
-
- TYPE_MIN_VALUE (gnu_type)
- = convert (TREE_TYPE (gnu_type),
- elaborate_expression (Type_Low_Bound (gnat_entity),
- gnat_entity,
- get_identifier ("L"), definition, 1,
- Needs_Debug_Info (gnat_entity)));
-
- TYPE_MAX_VALUE (gnu_type)
- = convert (TREE_TYPE (gnu_type),
- elaborate_expression (Type_High_Bound (gnat_entity),
- gnat_entity,
- get_identifier ("U"), definition, 1,
- Needs_Debug_Info (gnat_entity)));
-
- /* One of the above calls might have caused us to be elaborated,
- so don't blow up if so. */
- if (present_gnu_tree (gnat_entity))
- {
- maybe_present = 1;
- break;
- }
-
- TYPE_BIASED_REPRESENTATION_P (gnu_type)
- = Has_Biased_Representation (gnat_entity);
-
- /* This should be an unsigned type if the lower bound is constant
- and non-negative or if the base type is unsigned; a signed type
- otherwise. */
- TREE_UNSIGNED (gnu_type)
- = (TREE_UNSIGNED (TREE_TYPE (gnu_type))
- || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
- && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
- || TYPE_BIASED_REPRESENTATION_P (gnu_type)
- || Is_Unsigned_Type (gnat_entity));
-
- layout_type (gnu_type);
-
- if (Is_Packed_Array_Type (gnat_entity) && BYTES_BIG_ENDIAN)
- {
- tree gnu_field_type = gnu_type;
- tree gnu_field;
-
- TYPE_RM_SIZE_INT (gnu_field_type)
- = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
- gnu_type = make_node (RECORD_TYPE);
- TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "LJM");
- TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
- TYPE_PACKED (gnu_type) = 1;
- gnu_field = create_field_decl (get_identifier ("OBJECT"),
- gnu_field_type, gnu_type, 1, 0, 0, 1),
- finish_record_type (gnu_type, gnu_field, 0, 0);
- TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type) = 1;
- TYPE_ADA_SIZE (gnu_type) = bitsize_int (esize);
- }
-
- break;
-
- case E_Floating_Point_Type:
- /* If this is a VAX floating-point type, use an integer of the proper
- size. All the operations will be handled with ASM statements. */
- if (Vax_Float (gnat_entity))
- {
- gnu_type = make_signed_type (esize);
- TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
- TYPE_DIGITS_VALUE (gnu_type)
- = UI_To_Int (Digits_Value (gnat_entity));
- break;
- }
-
- /* The type of the Low and High bounds can be our type if this is
- a type from Standard, so set them at the end of the function. */
- gnu_type = make_node (REAL_TYPE);
- TYPE_PRECISION (gnu_type) = esize;
- layout_type (gnu_type);
- break;
-
- case E_Floating_Point_Subtype:
- if (Vax_Float (gnat_entity))
- {
- gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
- break;
- }
-
- {
- enum machine_mode mode;
-
- if (definition == 0
- && Present (Ancestor_Subtype (gnat_entity))
- && ! In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
- && (! Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
- || ! Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
- gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
- gnu_expr, definition);
-
- for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
- (GET_MODE_WIDER_MODE (mode) != VOIDmode
- && GET_MODE_BITSIZE (GET_MODE_WIDER_MODE (mode)) <= esize);
- mode = GET_MODE_WIDER_MODE (mode))
- ;
-
- gnu_type = make_node (REAL_TYPE);
- TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
- TYPE_PRECISION (gnu_type) = GET_MODE_BITSIZE (mode);
-
- TYPE_MIN_VALUE (gnu_type)
- = convert (TREE_TYPE (gnu_type),
- elaborate_expression (Type_Low_Bound (gnat_entity),
- gnat_entity, get_identifier ("L"),
- definition, 1,
- Needs_Debug_Info (gnat_entity)));
-
- TYPE_MAX_VALUE (gnu_type)
- = convert (TREE_TYPE (gnu_type),
- elaborate_expression (Type_High_Bound (gnat_entity),
- gnat_entity, get_identifier ("U"),
- definition, 1,
- Needs_Debug_Info (gnat_entity)));
-
- /* One of the above calls might have caused us to be elaborated,
- so don't blow up if so. */
- if (present_gnu_tree (gnat_entity))
- {
- maybe_present = 1;
- break;
- }
-
- layout_type (gnu_type);
- }
- break;
-
- /* Array and String Types and Subtypes
-
- Unconstrained array types are represented by E_Array_Type and
- constrained array types are represented by E_Array_Subtype. There
- are no actual objects of an unconstrained array type; all we have
- are pointers to that type.
-
- The following fields are defined on array types and subtypes:
-
- Component_Type Component type of the array.
- Number_Dimensions Number of dimensions (an int).
- First_Index Type of first index. */
-
- case E_String_Type:
- case E_Array_Type:
- {
- tree gnu_template_fields = NULL_TREE;
- tree gnu_template_type = make_node (RECORD_TYPE);
- tree gnu_ptr_template = build_pointer_type (gnu_template_type);
- tree gnu_fat_type = make_node (RECORD_TYPE);
- int ndim = Number_Dimensions (gnat_entity);
- int firstdim
- = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
- int nextdim
- = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
- tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
- tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
- tree gnu_comp_size = 0;
- tree gnu_max_size = size_one_node;
- tree gnu_max_size_unit;
- int index;
- Entity_Id gnat_ind_subtype;
- Entity_Id gnat_ind_base_subtype;
- tree gnu_template_reference;
- tree tem;
-
- TYPE_NAME (gnu_template_type)
- = create_concat_name (gnat_entity, "XUB");
- TYPE_NAME (gnu_fat_type) = create_concat_name (gnat_entity, "XUP");
- TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
- TREE_READONLY (gnu_template_type) = 1;
-
- /* Make a node for the array. If we are not defining the array
- suppress expanding incomplete types and save the node as the type
- for GNAT_ENTITY. */
- gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
- if (! definition)
- {
- defer_incomplete_level++;
- this_deferred = this_made_decl = 1;
- gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
- ! Comes_From_Source (gnat_entity),
- debug_info_p);
- save_gnu_tree (gnat_entity, gnu_decl, 0);
- saved = 1;
- }
-
- /* Build the fat pointer type. Use a "void *" object instead of
- a pointer to the array type since we don't have the array type
- yet (it will reference the fat pointer via the bounds). */
- tem = chainon (chainon (NULL_TREE,
- create_field_decl (get_identifier ("P_ARRAY"),
- ptr_void_type_node,
- gnu_fat_type, 0, 0, 0, 0)),
- create_field_decl (get_identifier ("P_BOUNDS"),
- gnu_ptr_template,
- gnu_fat_type, 0, 0, 0, 0));
-
- /* Make sure we can put this into a register. */
- TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
- finish_record_type (gnu_fat_type, tem, 0, 1);
-
- /* Build a reference to the template from a PLACEHOLDER_EXPR that
- is the fat pointer. This will be used to access the individual
- fields once we build them. */
- tem = build (COMPONENT_REF, gnu_ptr_template,
- build (PLACEHOLDER_EXPR, gnu_fat_type),
- TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)));
- gnu_template_reference
- = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
- TREE_READONLY (gnu_template_reference) = 1;
-
- /* Now create the GCC type for each index and add the fields for
- that index to the template. */
- for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
- gnat_ind_base_subtype
- = First_Index (Implementation_Base_Type (gnat_entity));
- index < ndim && index >= 0;
- index += nextdim,
- gnat_ind_subtype = Next_Index (gnat_ind_subtype),
- gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
- {
- char field_name[10];
- tree gnu_ind_subtype
- = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
- tree gnu_base_subtype
- = get_unpadded_type (Etype (gnat_ind_base_subtype));
- tree gnu_base_min
- = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
- tree gnu_base_max
- = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
- tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
-
- /* Make the FIELD_DECLs for the minimum and maximum of this
- type and then make extractions of that field from the
- template. */
- set_lineno (gnat_entity, 0);
- sprintf (field_name, "LB%d", index);
- gnu_min_field = create_field_decl (get_identifier (field_name),
- gnu_ind_subtype,
- gnu_template_type, 0, 0, 0, 0);
- field_name[0] = 'U';
- gnu_max_field = create_field_decl (get_identifier (field_name),
- gnu_ind_subtype,
- gnu_template_type, 0, 0, 0, 0);
-
- gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
-
- /* We can't use build_component_ref here since the template
- type isn't complete yet. */
- gnu_min = build (COMPONENT_REF, gnu_ind_subtype,
- gnu_template_reference, gnu_min_field);
- gnu_max = build (COMPONENT_REF, gnu_ind_subtype,
- gnu_template_reference, gnu_max_field);
- TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
-
- /* Make a range type with the new ranges, but using
- the Ada subtype. Then we convert to sizetype. */
- gnu_index_types[index]
- = create_index_type (convert (sizetype, gnu_min),
- convert (sizetype, gnu_max),
- build_range_type (gnu_ind_subtype,
- gnu_min, gnu_max));
- /* Update the maximum size of the array, in elements. */
- gnu_max_size
- = size_binop (MULT_EXPR, gnu_max_size,
- size_binop (PLUS_EXPR, size_one_node,
- size_binop (MINUS_EXPR, gnu_base_max,
- gnu_base_min)));
-
- TYPE_NAME (gnu_index_types[index])
- = create_concat_name (gnat_entity, field_name);
- }
-
- for (index = 0; index < ndim; index++)
- gnu_template_fields
- = chainon (gnu_template_fields, gnu_temp_fields[index]);
-
- /* Install all the fields into the template. */
- finish_record_type (gnu_template_type, gnu_template_fields, 0, 0);
- TREE_READONLY (gnu_template_type) = 1;
-
- /* Now make the array of arrays and update the pointer to the array
- in the fat pointer. Note that it is the first field. */
-
- tem = gnat_to_gnu_type (Component_Type (gnat_entity));
-
- /* Get and validate any specified Component_Size, but if Packed,
- ignore it since the front end will have taken care of it. Also,
- allow sizes not a multiple of Storage_Unit if packed. */
- gnu_comp_size
- = validate_size (Component_Size (gnat_entity), tem,
- gnat_entity,
- (Is_Bit_Packed_Array (gnat_entity)
- ? TYPE_DECL : VAR_DECL), 1,
- Has_Component_Size_Clause (gnat_entity));
-
- if (Has_Atomic_Components (gnat_entity))
- check_ok_for_atomic (tem, gnat_entity, 1);
-
- /* If the component type is a RECORD_TYPE that has a self-referential
- size, use the maxium size. */
- if (gnu_comp_size == 0 && TREE_CODE (tem) == RECORD_TYPE
- && TREE_CODE (TYPE_SIZE (tem)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (tem)))
- gnu_comp_size = max_size (TYPE_SIZE (tem), 1);
-
- if (! Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size != 0)
- {
- tem = make_type_from_size (tem, gnu_comp_size, 0);
- tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
- "C_PAD", 0, definition, 1);
- }
-
- if (Has_Volatile_Components (gnat_entity))
- tem = build_qualified_type (tem,
- TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
-
- /* If Component_Size is not already specified, annotate it with the
- size of the component. */
- if (Unknown_Component_Size (gnat_entity))
- Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
-
- gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
- size_binop (MULT_EXPR, gnu_max_size,
- TYPE_SIZE_UNIT (tem)));
- gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
- size_binop (MULT_EXPR,
- convert (bitsizetype,
- gnu_max_size),
- TYPE_SIZE (tem)));
-
- for (index = ndim - 1; index >= 0; index--)
- {
- tem = build_array_type (tem, gnu_index_types[index]);
- TYPE_MULTI_ARRAY_P (tem) = (index > 0);
- TYPE_NONALIASED_COMPONENT (tem)
- = ! Has_Aliased_Components (gnat_entity);
- }
-
- /* If an alignment is specified, use it if valid. But ignore it for
- types that represent the unpacked base type for packed arrays. */
- if (No (Packed_Array_Type (gnat_entity))
- && Known_Alignment (gnat_entity))
- {
- if (No (Alignment (gnat_entity)))
- gigi_abort (124);
-
- TYPE_ALIGN (tem)
- = validate_alignment (Alignment (gnat_entity), gnat_entity,
- TYPE_ALIGN (tem));
- }
-
- TYPE_CONVENTION_FORTRAN_P (tem)
- = (Convention (gnat_entity) == Convention_Fortran);
- TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
-
- /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
- corresponding fat pointer. */
- TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
- = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
- TYPE_MODE (gnu_type) = BLKmode;
- TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
- TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type) = gnu_type;
-
- /* If the maximum size doesn't overflow, use it. */
- if (TREE_CODE (gnu_max_size) == INTEGER_CST
- && ! TREE_OVERFLOW (gnu_max_size))
- {
- TYPE_SIZE (tem)
- = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
- TYPE_SIZE_UNIT (tem)
- = size_binop (MIN_EXPR, gnu_max_size_unit,
- TYPE_SIZE_UNIT (tem));
- }
-
- create_type_decl (create_concat_name (gnat_entity, "XUA"),
- tem, 0, ! Comes_From_Source (gnat_entity),
- debug_info_p);
- rest_of_type_compilation (gnu_fat_type, global_bindings_p ());
-
- /* Create a record type for the object and its template and
- set the template at a negative offset. */
- tem = build_unc_object_type (gnu_template_type, tem,
- create_concat_name (gnat_entity, "XUT"));
- DECL_FIELD_OFFSET (TYPE_FIELDS (tem))
- = size_binop (MINUS_EXPR, size_zero_node,
- byte_position (TREE_CHAIN (TYPE_FIELDS (tem))));
- DECL_FIELD_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem))) = size_zero_node;
- DECL_FIELD_BIT_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem)))
- = bitsize_zero_node;
- TYPE_UNCONSTRAINED_ARRAY (tem) = gnu_type;
- TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
-
- /* Give the thin pointer type a name. */
- create_type_decl (create_concat_name (gnat_entity, "XUX"),
- build_pointer_type (tem), 0,
- ! Comes_From_Source (gnat_entity), debug_info_p);
- }
- break;
-
- case E_String_Subtype:
- case E_Array_Subtype:
-
- /* This is the actual data type for array variables. Multidimensional
- arrays are implemented in the gnu tree as arrays of arrays. Note
- that for the moment arrays which have sparse enumeration subtypes as
- index components create sparse arrays, which is obviously space
- inefficient but so much easier to code for now.
-
- Also note that the subtype never refers to the unconstrained
- array type, which is somewhat at variance with Ada semantics.
-
- First check to see if this is simply a renaming of the array
- type. If so, the result is the array type. */
-
- gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
- if (! Is_Constrained (gnat_entity))
- break;
- else
- {
- int index;
- int array_dim = Number_Dimensions (gnat_entity);
- int first_dim
- = ((Convention (gnat_entity) == Convention_Fortran)
- ? array_dim - 1 : 0);
- int next_dim
- = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
- Entity_Id gnat_ind_subtype;
- Entity_Id gnat_ind_base_subtype;
- tree gnu_base_type = gnu_type;
- tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
- tree gnu_comp_size = 0;
- tree gnu_max_size = size_one_node;
- tree gnu_max_size_unit;
- int need_index_type_struct = 0;
- int max_overflow = 0;
-
- /* First create the gnu types for each index. Create types for
- debugging information to point to the index types if the
- are not integer types, have variable bounds, or are
- wider than sizetype. */
-
- for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
- gnat_ind_base_subtype
- = First_Index (Implementation_Base_Type (gnat_entity));
- index < array_dim && index >= 0;
- index += next_dim,
- gnat_ind_subtype = Next_Index (gnat_ind_subtype),
- gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
- {
- tree gnu_index_subtype
- = get_unpadded_type (Etype (gnat_ind_subtype));
- tree gnu_min
- = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
- tree gnu_max
- = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
- tree gnu_base_subtype
- = get_unpadded_type (Etype (gnat_ind_base_subtype));
- tree gnu_base_min
- = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
- tree gnu_base_max
- = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
- tree gnu_base_type = get_base_type (gnu_base_subtype);
- tree gnu_base_base_min
- = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
- tree gnu_base_base_max
- = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
- tree gnu_high;
- tree gnu_this_max;
-
- /* If the minimum and maximum values both overflow in
- SIZETYPE, but the difference in the original type
- does not overflow in SIZETYPE, ignore the overflow
- indications. */
- if ((TYPE_PRECISION (gnu_index_subtype)
- > TYPE_PRECISION (sizetype))
- && TREE_CODE (gnu_min) == INTEGER_CST
- && TREE_CODE (gnu_max) == INTEGER_CST
- && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
- && (! TREE_OVERFLOW
- (fold (build (MINUS_EXPR, gnu_index_subtype,
- TYPE_MAX_VALUE (gnu_index_subtype),
- TYPE_MIN_VALUE (gnu_index_subtype))))))
- TREE_OVERFLOW (gnu_min) = TREE_OVERFLOW (gnu_max)
- = TREE_CONSTANT_OVERFLOW (gnu_min)
- = TREE_CONSTANT_OVERFLOW (gnu_max) = 0;
-
- /* Similarly, if the range is null, use bounds of 1..0 for
- the sizetype bounds. */
- else if ((TYPE_PRECISION (gnu_index_subtype)
- > TYPE_PRECISION (sizetype))
- && TREE_CODE (gnu_min) == INTEGER_CST
- && TREE_CODE (gnu_max) == INTEGER_CST
- && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
- && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
- TYPE_MIN_VALUE (gnu_index_subtype)))
- gnu_min = size_one_node, gnu_max = size_zero_node;
-
- /* Now compute the size of this bound. We need to provide
- GCC with an upper bound to use but have to deal with the
- "superflat" case. There are three ways to do this. If we
- can prove that the array can never be superflat, we can
- just use the high bound of the index subtype. If we can
- prove that the low bound minus one can't overflow, we
- can do this as MAX (hb, lb - 1). Otherwise, we have to use
- the expression hb >= lb ? hb : lb - 1. */
- gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
-
- /* See if the base array type is already flat. If it is, we
- are probably compiling an ACVC test, but it will cause the
- code below to malfunction if we don't handle it specially. */
- if (TREE_CODE (gnu_base_min) == INTEGER_CST
- && TREE_CODE (gnu_base_max) == INTEGER_CST
- && ! TREE_CONSTANT_OVERFLOW (gnu_base_min)
- && ! TREE_CONSTANT_OVERFLOW (gnu_base_max)
- && tree_int_cst_lt (gnu_base_max, gnu_base_min))
- gnu_high = size_zero_node, gnu_min = size_one_node;
-
- /* If gnu_high is now an integer which overflowed, the array
- cannot be superflat. */
- else if (TREE_CODE (gnu_high) == INTEGER_CST
- && TREE_OVERFLOW (gnu_high))
- gnu_high = gnu_max;
- else if (TREE_UNSIGNED (gnu_base_subtype)
- || TREE_CODE (gnu_high) == INTEGER_CST)
- gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
- else
- gnu_high
- = build_cond_expr
- (sizetype, build_binary_op (GE_EXPR, integer_type_node,
- gnu_max, gnu_min),
- gnu_max, gnu_high);
-
- gnu_index_type[index]
- = create_index_type (gnu_min, gnu_high, gnu_index_subtype);
-
- /* Also compute the maximum size of the array. Here we
- see if any constraint on the index type of the base type
- can be used in the case of self-referential bound on
- the index type of the subtype. We look for a non-"infinite"
- and non-self-referential bound from any type involved and
- handle each bound separately. */
-
- if ((TREE_CODE (gnu_min) == INTEGER_CST
- && ! TREE_OVERFLOW (gnu_min)
- && ! operand_equal_p (gnu_min, gnu_base_base_min, 0))
- || (TREE_CODE (gnu_min) != INTEGER_CST
- && ! contains_placeholder_p (gnu_min)))
- gnu_base_min = gnu_min;
-
- if ((TREE_CODE (gnu_max) == INTEGER_CST
- && ! TREE_OVERFLOW (gnu_max)
- && ! operand_equal_p (gnu_max, gnu_base_base_max, 0))
- || (TREE_CODE (gnu_max) != INTEGER_CST
- && ! contains_placeholder_p (gnu_max)))
- gnu_base_max = gnu_max;
-
- if ((TREE_CODE (gnu_base_min) == INTEGER_CST
- && TREE_CONSTANT_OVERFLOW (gnu_base_min))
- || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
- || (TREE_CODE (gnu_base_max) == INTEGER_CST
- && TREE_CONSTANT_OVERFLOW (gnu_base_max))
- || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
- max_overflow = 1;
-
- gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
- gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
-
- gnu_this_max
- = size_binop (MAX_EXPR,
- size_binop (PLUS_EXPR, size_one_node,
- size_binop (MINUS_EXPR, gnu_base_max,
- gnu_base_min)),
- size_zero_node);
-
- if (TREE_CODE (gnu_this_max) == INTEGER_CST
- && TREE_CONSTANT_OVERFLOW (gnu_this_max))
- max_overflow = 1;
-
- gnu_max_size
- = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
-
- if (! integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
- || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
- != INTEGER_CST)
- || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
- || (TREE_TYPE (gnu_index_subtype) != 0
- && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
- != INTEGER_TYPE))
- || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
- || (TYPE_PRECISION (gnu_index_subtype)
- > TYPE_PRECISION (sizetype)))
- need_index_type_struct = 1;
- }
-
- /* Then flatten: create the array of arrays. */
-
- gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
-
- /* One of the above calls might have caused us to be elaborated,
- so don't blow up if so. */
- if (present_gnu_tree (gnat_entity))
- {
- maybe_present = 1;
- break;
- }
-
- /* Get and validate any specified Component_Size, but if Packed,
- ignore it since the front end will have taken care of it. Also,
- allow sizes not a multiple of Storage_Unit if packed. */
- gnu_comp_size
- = validate_size (Component_Size (gnat_entity), gnu_type,
- gnat_entity,
- (Is_Bit_Packed_Array (gnat_entity)
- ? TYPE_DECL : VAR_DECL),
- 1, Has_Component_Size_Clause (gnat_entity));
-
- /* If the component type is a RECORD_TYPE that has a self-referential
- size, use the maxium size. */
- if (gnu_comp_size == 0 && TREE_CODE (gnu_type) == RECORD_TYPE
- && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (gnu_type)))
- gnu_comp_size = max_size (TYPE_SIZE (gnu_type), 1);
-
- if (! Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size != 0)
- {
- gnu_type = make_type_from_size (gnu_type, gnu_comp_size, 0);
- gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
- gnat_entity, "C_PAD", 0,
- definition, 1);
- }
-
- if (Has_Volatile_Components (Base_Type (gnat_entity)))
- gnu_type = build_qualified_type (gnu_type,
- (TYPE_QUALS (gnu_type)
- | TYPE_QUAL_VOLATILE));
-
- gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
- TYPE_SIZE_UNIT (gnu_type));
- gnu_max_size = size_binop (MULT_EXPR,
- convert (bitsizetype, gnu_max_size),
- TYPE_SIZE (gnu_type));
-
- /* We don't want any array types shared for two reasons: first,
- we want to keep differently-named types distinct; second,
- setting TYPE_MULTI_ARRAY_TYPE of one type can clobber
- another. */
- debug_no_type_hash = 1;
- for (index = array_dim - 1; index >= 0; index --)
- {
- gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
- TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
- TYPE_NONALIASED_COMPONENT (gnu_type)
- = ! Has_Aliased_Components (gnat_entity);
- }
-
- /* If we are at file level and this is a multi-dimensional array, we
- need to make a variable corresponding to the stride of the
- inner dimensions. */
- if (global_bindings_p () && array_dim > 1)
- {
- tree gnu_str_name = get_identifier ("ST");
- tree gnu_arr_type;
-
- for (gnu_arr_type = TREE_TYPE (gnu_type);
- TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
- gnu_arr_type = TREE_TYPE (gnu_arr_type),
- gnu_str_name = concat_id_with_name (gnu_str_name, "ST"))
- {
- TYPE_SIZE (gnu_arr_type)
- = elaborate_expression_1 (gnat_entity, gnat_entity,
- TYPE_SIZE (gnu_arr_type),
- gnu_str_name, definition, 0);
- TYPE_SIZE_UNIT (gnu_arr_type)
- = elaborate_expression_1
- (gnat_entity, gnat_entity, TYPE_SIZE_UNIT (gnu_arr_type),
- concat_id_with_name (gnu_str_name, "U"), definition, 0);
- }
- }
-
- /* If we need to write out a record type giving the names of
- the bounds, do it now. */
- if (need_index_type_struct && debug_info_p)
- {
- tree gnu_bound_rec_type = make_node (RECORD_TYPE);
- tree gnu_field_list = 0;
- tree gnu_field;
-
- TYPE_NAME (gnu_bound_rec_type)
- = create_concat_name (gnat_entity, "XA");
-
- for (index = array_dim - 1; index >= 0; index--)
- {
- tree gnu_type_name
- = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type[index]));
-
- if (TREE_CODE (gnu_type_name) == TYPE_DECL)
- gnu_type_name = DECL_NAME (gnu_type_name);
-
- gnu_field = create_field_decl (gnu_type_name,
- integer_type_node,
- gnu_bound_rec_type,
- 0, NULL_TREE, NULL_TREE, 0);
- TREE_CHAIN (gnu_field) = gnu_field_list;
- gnu_field_list = gnu_field;
- }
-
- finish_record_type (gnu_bound_rec_type, gnu_field_list, 0, 0);
- }
-
- debug_no_type_hash = 0;
- TYPE_CONVENTION_FORTRAN_P (gnu_type)
- = (Convention (gnat_entity) == Convention_Fortran);
-
- /* If our size depends on a placeholder and the maximum size doesn't
- overflow, use it. */
- if (TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (gnu_type))
- && ! (TREE_CODE (gnu_max_size) == INTEGER_CST
- && TREE_OVERFLOW (gnu_max_size))
- && ! max_overflow)
- {
- TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
- TYPE_SIZE (gnu_type));
- TYPE_SIZE_UNIT (gnu_type)
- = size_binop (MIN_EXPR, gnu_max_size_unit,
- TYPE_SIZE_UNIT (gnu_type));
- }
-
- /* Set our alias set to that of our base type. This gives all
- array subtypes the same alias set. */
- TYPE_ALIAS_SET (gnu_type) = get_alias_set (gnu_base_type);
- record_component_aliases (gnu_type);
- }
-
- /* If this is a packed type, make this type the same as the packed
- array type, but do some adjusting in the type first. */
-
- if (Present (Packed_Array_Type (gnat_entity)))
- {
- Entity_Id gnat_index;
- tree gnu_inner_type;
-
- /* First finish the type we had been making so that we output
- debugging information for it */
- gnu_type = build_qualified_type (gnu_type,
- (TYPE_QUALS (gnu_type)
- | (TYPE_QUAL_VOLATILE
- * Is_Volatile (gnat_entity))));
- set_lineno (gnat_entity, 0);
- gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
- ! Comes_From_Source (gnat_entity),
- debug_info_p);
- if (! Comes_From_Source (gnat_entity))
- DECL_ARTIFICIAL (gnu_decl) = 1;
-
- /* Save it as our equivalent in case the call below elaborates
- this type again. */
- save_gnu_tree (gnat_entity, gnu_decl, 0);
-
- gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
- NULL_TREE, 0);
- this_made_decl = 1;
- gnu_inner_type = gnu_type = TREE_TYPE (gnu_decl);
- save_gnu_tree (gnat_entity, NULL_TREE, 0);
-
- if (TREE_CODE (gnu_inner_type) == RECORD_TYPE
- && (TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_inner_type)
- || TYPE_IS_PADDING_P (gnu_inner_type)))
- gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
-
- /* We need to point the type we just made to our index type so
- the actual bounds can be put into a template. */
-
- if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
- && TYPE_ACTUAL_BOUNDS (gnu_inner_type) == 0)
- || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
- && ! TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
- {
- if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
- {
- /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
- If it is, we need to make another type. */
- if (TYPE_MODULAR_P (gnu_inner_type))
- {
- tree gnu_subtype;
-
- gnu_subtype = make_node (INTEGER_TYPE);
-
- TREE_TYPE (gnu_subtype) = gnu_inner_type;
- TYPE_MIN_VALUE (gnu_subtype)
- = TYPE_MIN_VALUE (gnu_inner_type);
- TYPE_MAX_VALUE (gnu_subtype)
- = TYPE_MAX_VALUE (gnu_inner_type);
- TYPE_PRECISION (gnu_subtype)
- = TYPE_PRECISION (gnu_inner_type);
- TREE_UNSIGNED (gnu_subtype)
- = TREE_UNSIGNED (gnu_inner_type);
- TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
- layout_type (gnu_subtype);
-
- gnu_inner_type = gnu_subtype;
- }
-
- TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
- }
-
- TYPE_ACTUAL_BOUNDS (gnu_inner_type) = NULL_TREE;
-
- for (gnat_index = First_Index (gnat_entity);
- Present (gnat_index); gnat_index = Next_Index (gnat_index))
- TYPE_ACTUAL_BOUNDS (gnu_inner_type)
- = tree_cons (NULL_TREE,
- get_unpadded_type (Etype (gnat_index)),
- TYPE_ACTUAL_BOUNDS (gnu_inner_type));
-
- if (Convention (gnat_entity) != Convention_Fortran)
- TYPE_ACTUAL_BOUNDS (gnu_inner_type)
- = nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type));
-
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type))
- TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
- }
- }
-
- /* Abort if packed array with no packed array type field set. */
- else if (Is_Packed (gnat_entity))
- gigi_abort (107);
-
- break;
-
- case E_String_Literal_Subtype:
- /* Create the type for a string literal. */
- {
- Entity_Id gnat_full_type
- = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
- && Present (Full_View (Etype (gnat_entity)))
- ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
- tree gnu_string_type = get_unpadded_type (gnat_full_type);
- tree gnu_string_array_type
- = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
- tree gnu_string_index_type
- = TREE_TYPE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_string_array_type)));
- tree gnu_lower_bound
- = convert (gnu_string_index_type,
- gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
- int length = UI_To_Int (String_Literal_Length (gnat_entity));
- tree gnu_length = ssize_int (length - 1);
- tree gnu_upper_bound
- = build_binary_op (PLUS_EXPR, gnu_string_index_type,
- gnu_lower_bound,
- convert (gnu_string_index_type, gnu_length));
- tree gnu_range_type
- = build_range_type (gnu_string_index_type,
- gnu_lower_bound, gnu_upper_bound);
- tree gnu_index_type
- = create_index_type (convert (sizetype,
- TYPE_MIN_VALUE (gnu_range_type)),
- convert (sizetype,
- TYPE_MAX_VALUE (gnu_range_type)),
- gnu_range_type);
-
- gnu_type
- = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
- gnu_index_type);
- }
- break;
-
- /* Record Types and Subtypes
-
- The following fields are defined on record types:
-
- Has_Discriminants True if the record has discriminants
- First_Discriminant Points to head of list of discriminants
- First_Entity Points to head of list of fields
- Is_Tagged_Type True if the record is tagged
-
- Implementation of Ada records and discriminated records:
-
- A record type definition is transformed into the equivalent of a C
- struct definition. The fields that are the discriminants which are
- found in the Full_Type_Declaration node and the elements of the
- Component_List found in the Record_Type_Definition node. The
- Component_List can be a recursive structure since each Variant of
- the Variant_Part of the Component_List has a Component_List.
-
- Processing of a record type definition comprises starting the list of
- field declarations here from the discriminants and the calling the
- function components_to_record to add the rest of the fields from the
- component list and return the gnu type node. The function
- components_to_record will call itself recursively as it traverses
- the tree. */
-
- case E_Record_Type:
-#if 0
- if (Has_Complex_Representation (gnat_entity))
- {
- gnu_type
- = build_complex_type
- (get_unpadded_type
- (Etype (Defining_Entity
- (First (Component_Items
- (Component_List
- (Type_Definition
- (Declaration_Node (gnat_entity)))))))));
-
- /* ??? For now, don't use Complex if the real type is shorter than
- a word. */
- if (GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (gnu_type)))
- >= BITS_PER_WORD)
- break;
- }
-#endif
-
- {
- Node_Id full_definition = Declaration_Node (gnat_entity);
- Node_Id record_definition = Type_Definition (full_definition);
- Entity_Id gnat_field;
- tree gnu_field;
- tree gnu_field_list = NULL_TREE;
- tree gnu_get_parent;
- int packed = (Is_Packed (gnat_entity) ? 1
- : (Component_Alignment (gnat_entity)
- == Calign_Storage_Unit) ? -1
- : 0);
- int has_rep = Has_Specified_Layout (gnat_entity);
- int all_rep = has_rep;
- int is_extension
- = (Is_Tagged_Type (gnat_entity)
- && Nkind (record_definition) == N_Derived_Type_Definition);
-
- /* See if all fields have a rep clause. Stop when we find one
- that doesn't. */
- for (gnat_field = First_Entity (gnat_entity);
- Present (gnat_field) && all_rep;
- gnat_field = Next_Entity (gnat_field))
- if ((Ekind (gnat_field) == E_Component
- || Ekind (gnat_field) == E_Discriminant)
- && No (Component_Clause (gnat_field)))
- all_rep = 0;
-
- /* If this is a record extension, go a level further to find the
- record definition. Also, verify we have a Parent_Subtype. */
- if (is_extension)
- {
- if (! type_annotate_only
- || Present (Record_Extension_Part (record_definition)))
- record_definition = Record_Extension_Part (record_definition);
-
- if (! type_annotate_only && No (Parent_Subtype (gnat_entity)))
- gigi_abort (121);
- }
-
- /* Make a node for the record. If we are not defining the record,
- suppress expanding incomplete types and save the node as the type
- for GNAT_ENTITY. We use the same RECORD_TYPE as was made
- for a dummy type and then show it's no longer a dummy. */
- gnu_type = make_dummy_type (gnat_entity);
- TYPE_DUMMY_P (gnu_type) = 0;
- if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL && debug_info_p)
- DECL_IGNORED_P (TYPE_NAME (gnu_type)) = 0;
-
- TYPE_ALIGN (gnu_type) = 0;
- TYPE_PACKED (gnu_type) = packed != 0 || has_rep;
-
- if (! definition)
- {
- defer_incomplete_level++;
- this_deferred = 1;
- set_lineno (gnat_entity, 0);
- gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
- ! Comes_From_Source (gnat_entity),
- debug_info_p);
- save_gnu_tree (gnat_entity, gnu_decl, 0);
- this_made_decl = saved = 1;
- }
-
- /* If both a size and rep clause was specified, put the size in
- the record type now so that it can get the proper mode. */
- if (has_rep && Known_Esize (gnat_entity))
- TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
-
- /* Always set the alignment here so that it can be used to
- set the mode, if it is making the alignment stricter. If
- it is invalid, it will be checked again below. If this is to
- be Atomic, choose a default alignment of a word. */
-
- if (Known_Alignment (gnat_entity))
- TYPE_ALIGN (gnu_type)
- = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
- else if (Is_Atomic (gnat_entity))
- TYPE_ALIGN (gnu_type) = BITS_PER_WORD;
-
- /* If we have a Parent_Subtype, make a field for the parent. If
- this record has rep clauses, force the position to zero. */
- if (Present (Parent_Subtype (gnat_entity)))
- {
- tree gnu_parent;
-
- /* A major complexity here is that the parent subtype will
- reference our discriminants. But those must reference
- the parent component of this record. So here we will
- initialize each of those components to a COMPONENT_REF.
- The first operand of that COMPONENT_REF is another
- COMPONENT_REF which will be filled in below, once
- the parent type can be safely built. */
-
- gnu_get_parent = build (COMPONENT_REF, void_type_node,
- build (PLACEHOLDER_EXPR, gnu_type),
- build_decl (FIELD_DECL, NULL_TREE,
- NULL_TREE));
-
- if (Has_Discriminants (gnat_entity))
- for (gnat_field = First_Girder_Discriminant (gnat_entity);
- Present (gnat_field);
- gnat_field = Next_Girder_Discriminant (gnat_field))
- if (Present (Corresponding_Discriminant (gnat_field)))
- save_gnu_tree
- (gnat_field,
- build (COMPONENT_REF,
- get_unpadded_type (Etype (gnat_field)),
- gnu_get_parent,
- gnat_to_gnu_entity (Corresponding_Discriminant
- (gnat_field),
- NULL_TREE, 0)),
- 1);
-
- gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_entity));
-
- gnu_field_list
- = create_field_decl (get_identifier
- (Get_Name_String (Name_uParent)),
- gnu_parent, gnu_type, 0,
- has_rep ? TYPE_SIZE (gnu_parent) : 0,
- has_rep ? bitsize_zero_node : 0, 1);
- DECL_INTERNAL_P (gnu_field_list) = 1;
-
- TREE_TYPE (gnu_get_parent) = gnu_parent;
- TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
- }
-
- /* Add the fields for the discriminants into the record. */
- if (! Is_Unchecked_Union (gnat_entity)
- && Has_Discriminants (gnat_entity))
- for (gnat_field = First_Girder_Discriminant (gnat_entity);
- Present (gnat_field);
- gnat_field = Next_Girder_Discriminant (gnat_field))
- {
- /* If this is a record extension and this discriminant
- is the renaming of another discriminant, we've already
- handled the discriminant above. */
- if (Present (Parent_Subtype (gnat_entity))
- && Present (Corresponding_Discriminant (gnat_field)))
- continue;
-
- gnu_field
- = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
-
- /* Make an expression using a PLACEHOLDER_EXPR from the
- FIELD_DECL node just created and link that with the
- corresponding GNAT defining identifier. Then add to the
- list of fields. */
- save_gnu_tree (gnat_field,
- build (COMPONENT_REF, TREE_TYPE (gnu_field),
- build (PLACEHOLDER_EXPR,
- DECL_CONTEXT (gnu_field)),
- gnu_field),
- 1);
-
- TREE_CHAIN (gnu_field) = gnu_field_list;
- gnu_field_list = gnu_field;
- }
-
- /* Put the discriminants into the record (backwards), so we can
- know the appropriate discriminant to use for the names of the
- variants. */
- TYPE_FIELDS (gnu_type) = gnu_field_list;
-
- /* Add the listed fields into the record and finish up. */
- components_to_record (gnu_type, Component_List (record_definition),
- gnu_field_list, packed, definition, 0,
- 0, all_rep);
-
- TYPE_DUMMY_P (gnu_type) = 0;
- TYPE_VOLATILE (gnu_type) = Is_Volatile (gnat_entity);
- TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
-
- /* If this is an extension type, reset the tree for any
- inherited discriminants. Also remove the PLACEHOLDER_EXPR
- for non-inherited discriminants. */
- if (! Is_Unchecked_Union (gnat_entity)
- && Has_Discriminants (gnat_entity))
- for (gnat_field = First_Girder_Discriminant (gnat_entity);
- Present (gnat_field);
- gnat_field = Next_Girder_Discriminant (gnat_field))
- {
- if (Present (Parent_Subtype (gnat_entity))
- && Present (Corresponding_Discriminant (gnat_field)))
- save_gnu_tree (gnat_field, NULL_TREE, 0);
- else
- {
- gnu_field = get_gnu_tree (gnat_field);
- save_gnu_tree (gnat_field, NULL_TREE, 0);
- save_gnu_tree (gnat_field, TREE_OPERAND (gnu_field, 1), 0);
- }
- }
-
- /* If it is a tagged record force the type to BLKmode to insure
- that these objects will always be placed in memory. Do the
- same thing for limited record types. */
-
- if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
- TYPE_MODE (gnu_type) = BLKmode;
-
- /* Fill in locations of fields. */
- annotate_rep (gnat_entity, gnu_type);
-
- /* If there are any entities in the chain corresponding to
- components that we did not elaborate, ensure we elaborate their
- types if they are Itypes. */
- for (gnat_temp = First_Entity (gnat_entity);
- Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
- if ((Ekind (gnat_temp) == E_Component
- || Ekind (gnat_temp) == E_Discriminant)
- && Is_Itype (Etype (gnat_temp))
- && ! present_gnu_tree (gnat_temp))
- gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
- }
- break;
-
- case E_Class_Wide_Subtype:
- /* If an equivalent type is present, that is what we should use.
- Otherwise, fall through to handle this like a record subtype
- since it may have constraints. */
-
- if (Present (Equivalent_Type (gnat_entity)))
- {
- gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
- maybe_present = 1;
- break;
- }
-
- /* ... fall through ... */
-
- case E_Record_Subtype:
-
- /* If Cloned_Subtype is Present it means this record subtype has
- identical layout to that type or subtype and we should use
- that GCC type for this one. The front end guarantees that
- the component list is shared. */
- if (Present (Cloned_Subtype (gnat_entity)))
- {
- gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
- NULL_TREE, 0);
- maybe_present = 1;
- }
-
- /* Otherwise, first ensure the base type is elaborated. Then, if we are
- changing the type, make a new type with each field having the
- type of the field in the new subtype but having the position
- computed by transforming every discriminant reference according
- to the constraints. We don't see any difference between
- private and nonprivate type here since derivations from types should
- have been deferred until the completion of the private type. */
- else
- {
- Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
- tree gnu_base_type;
- tree gnu_orig_type;
-
- if (! definition)
- defer_incomplete_level++, this_deferred = 1;
-
- /* Get the base type initially for its alignment and sizes. But
- if it is a padded type, we do all the other work with the
- unpadded type. */
- gnu_type = gnu_orig_type = gnu_base_type
- = gnat_to_gnu_type (gnat_base_type);
-
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_type))
- gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
-
- if (present_gnu_tree (gnat_entity))
- {
- maybe_present = 1;
- break;
- }
-
- /* When the type has discriminants, and these discriminants
- affect the shape of what it built, factor them in.
-
- If we are making a subtype of an Unchecked_Union (must be an
- Itype), just return the type.
-
- We can't just use Is_Constrained because private subtypes without
- discriminants of full types with discriminants with default
- expressions are Is_Constrained but aren't constrained! */
-
- if (IN (Ekind (gnat_base_type), Record_Kind)
- && ! Is_For_Access_Subtype (gnat_entity)
- && ! Is_Unchecked_Union (gnat_base_type)
- && Is_Constrained (gnat_entity)
- && Girder_Constraint (gnat_entity) != No_Elist
- && Present (Discriminant_Constraint (gnat_entity)))
- {
- Entity_Id gnat_field;
- Entity_Id gnat_root_type;
- tree gnu_field_list = 0;
- tree gnu_pos_list
- = compute_field_positions (gnu_orig_type, NULL_TREE,
- size_zero_node, bitsize_zero_node);
- tree gnu_subst_list
- = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
- definition);
- tree gnu_temp;
-
- /* If this is a derived type, we may be seeing fields from any
- original records, so add those positions and discriminant
- substitutions to our lists. */
- for (gnat_root_type = gnat_base_type;
- Underlying_Type (Etype (gnat_root_type)) != gnat_root_type;
- gnat_root_type = Underlying_Type (Etype (gnat_root_type)))
- {
- gnu_pos_list
- = compute_field_positions
- (gnat_to_gnu_type (Etype (gnat_root_type)),
- gnu_pos_list, size_zero_node, bitsize_zero_node);
-
- if (Present (Parent_Subtype (gnat_root_type)))
- gnu_subst_list
- = substitution_list (Parent_Subtype (gnat_root_type),
- Empty, gnu_subst_list, definition);
- }
-
- gnu_type = make_node (RECORD_TYPE);
- TYPE_NAME (gnu_type) = gnu_entity_id;
- TYPE_STUB_DECL (gnu_type)
- = pushdecl (build_decl (TYPE_DECL, NULL_TREE, gnu_type));
- TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
-
- for (gnat_field = First_Entity (gnat_entity);
- Present (gnat_field); gnat_field = Next_Entity (gnat_field))
- if (Ekind (gnat_field) == E_Component
- || Ekind (gnat_field) == E_Discriminant)
- {
- tree gnu_old_field
- = gnat_to_gnu_entity
- (Original_Record_Component (gnat_field), NULL_TREE, 0);
- tree gnu_offset
- = TREE_VALUE (purpose_member (gnu_old_field,
- gnu_pos_list));
- tree gnu_pos = TREE_PURPOSE (gnu_offset);
- tree gnu_bitpos = TREE_VALUE (gnu_offset);
- tree gnu_field_type
- = gnat_to_gnu_type (Etype (gnat_field));
- tree gnu_size = TYPE_SIZE (gnu_field_type);
- tree gnu_new_pos = 0;
- tree gnu_field;
-
- /* If there was a component clause, the field types must be
- the same for the type and subtype, so copy the data from
- the old field to avoid recomputation here. */
- if (Present (Component_Clause
- (Original_Record_Component (gnat_field))))
- {
- gnu_size = DECL_SIZE (gnu_old_field);
- gnu_field_type = TREE_TYPE (gnu_old_field);
- }
-
- /* If this was a bitfield, get the size from the old field.
- Also ensure the type can be placed into a bitfield. */
- else if (DECL_BIT_FIELD (gnu_old_field))
- {
- gnu_size = DECL_SIZE (gnu_old_field);
- if (TYPE_MODE (gnu_field_type) == BLKmode
- && TREE_CODE (gnu_field_type) == RECORD_TYPE
- && host_integerp (TYPE_SIZE (gnu_field_type), 1))
- gnu_field_type = make_packable_type (gnu_field_type);
- }
-
- if (TREE_CODE (gnu_pos) != INTEGER_CST
- && contains_placeholder_p (gnu_pos))
- for (gnu_temp = gnu_subst_list;
- gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
- gnu_pos = substitute_in_expr (gnu_pos,
- TREE_PURPOSE (gnu_temp),
- TREE_VALUE (gnu_temp));
-
- /* If the size is now a constant, we can set it as the
- size of the field when we make it. Otherwise, we need
- to deal with it specially. */
- if (TREE_CONSTANT (gnu_pos))
- gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
-
- gnu_field
- = create_field_decl
- (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
- 0, gnu_size, gnu_new_pos,
- ! DECL_NONADDRESSABLE_P (gnu_old_field));
-
- if (! TREE_CONSTANT (gnu_pos))
- {
- normalize_offset (&gnu_pos, &gnu_bitpos,
- DECL_OFFSET_ALIGN (gnu_old_field));
- DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
- DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
- SET_DECL_OFFSET_ALIGN
- (gnu_field, DECL_OFFSET_ALIGN (gnu_old_field));
- DECL_SIZE (gnu_field) = gnu_size;
- DECL_SIZE_UNIT (gnu_field)
- = convert (sizetype,
- size_binop (CEIL_DIV_EXPR, gnu_size,
- bitsize_unit_node));
- layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
- }
-
- DECL_INTERNAL_P (gnu_field)
- = DECL_INTERNAL_P (gnu_old_field);
- DECL_ORIGINAL_FIELD (gnu_field)
- = DECL_ORIGINAL_FIELD (gnu_old_field) != 0
- ? DECL_ORIGINAL_FIELD (gnu_old_field) : gnu_old_field;
- DECL_DISCRIMINANT_NUMBER (gnu_field)
- = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
- TREE_THIS_VOLATILE (gnu_field)
- = TREE_THIS_VOLATILE (gnu_old_field);
- TREE_CHAIN (gnu_field) = gnu_field_list;
- gnu_field_list = gnu_field;
- save_gnu_tree (gnat_field, gnu_field, 0);
- }
-
- finish_record_type (gnu_type, nreverse (gnu_field_list), 1, 0);
-
- /* Now set the size, alignment and alias set of the new type to
- match that of the old one, doing any substitutions, as
- above. */
- TYPE_ALIAS_SET (gnu_type) = get_alias_set (gnu_base_type);
- TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
- TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
- TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
- TYPE_ADA_SIZE (gnu_type) = TYPE_ADA_SIZE (gnu_base_type);
-
- if (TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (gnu_type)))
- for (gnu_temp = gnu_subst_list;
- gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
- TYPE_SIZE (gnu_type)
- = substitute_in_expr (TYPE_SIZE (gnu_type),
- TREE_PURPOSE (gnu_temp),
- TREE_VALUE (gnu_temp));
-
- if (TREE_CODE (TYPE_SIZE_UNIT (gnu_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE_UNIT (gnu_type)))
- for (gnu_temp = gnu_subst_list;
- gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
- TYPE_SIZE_UNIT (gnu_type)
- = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
- TREE_PURPOSE (gnu_temp),
- TREE_VALUE (gnu_temp));
-
- if (TYPE_ADA_SIZE (gnu_type) != 0
- && TREE_CODE (TYPE_ADA_SIZE (gnu_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_ADA_SIZE (gnu_type)))
- for (gnu_temp = gnu_subst_list;
- gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
- TYPE_ADA_SIZE (gnu_type)
- = substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
- TREE_PURPOSE (gnu_temp),
- TREE_VALUE (gnu_temp));
-
- /* Recompute the mode of this record type now that we know its
- actual size. */
- compute_record_mode (gnu_type);
-
- /* Fill in locations of fields. */
- annotate_rep (gnat_entity, gnu_type);
- }
-
- /* If we've made a new type, record it and make an XVS type to show
- what this is a subtype of. Some debuggers require the XVS
- type to be output first, so do it in that order. */
- if (gnu_type != gnu_orig_type)
- {
- if (debug_info_p)
- {
- tree gnu_subtype_marker = make_node (RECORD_TYPE);
- tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
-
- if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
- gnu_orig_name = DECL_NAME (gnu_orig_name);
-
- TYPE_NAME (gnu_subtype_marker)
- = create_concat_name (gnat_entity, "XVS");
- finish_record_type (gnu_subtype_marker,
- create_field_decl (gnu_orig_name,
- integer_type_node,
- gnu_subtype_marker,
- 0, NULL_TREE,
- NULL_TREE, 0),
- 0, 0);
- }
-
- TYPE_VOLATILE (gnu_type) = Is_Volatile (gnat_entity);
- TYPE_NAME (gnu_type) = gnu_entity_id;
- TYPE_STUB_DECL (gnu_type)
- = pushdecl (build_decl (TYPE_DECL, TYPE_NAME (gnu_type),
- gnu_type));
- DECL_ARTIFICIAL (TYPE_STUB_DECL (gnu_type)) = 1;
- DECL_IGNORED_P (TYPE_STUB_DECL (gnu_type)) = ! debug_info_p;
- rest_of_type_compilation (gnu_type, global_bindings_p ());
- }
-
- /* Otherwise, go down all the components in the new type and
- make them equivalent to those in the base type. */
- else
- for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
- gnat_temp = Next_Entity (gnat_temp))
- if ((Ekind (gnat_temp) == E_Discriminant
- && ! Is_Unchecked_Union (gnat_base_type))
- || Ekind (gnat_temp) == E_Component)
- save_gnu_tree (gnat_temp,
- get_gnu_tree
- (Original_Record_Component (gnat_temp)), 0);
- }
- break;
-
- case E_Access_Subprogram_Type:
- /* If we are not defining this entity, and we have incomplete
- entities being processed above us, make a dummy type and
- fill it in later. */
- if (! definition && defer_incomplete_level != 0)
- {
- struct incomplete *p
- = (struct incomplete *) xmalloc (sizeof (struct incomplete));
-
- gnu_type
- = build_pointer_type
- (make_dummy_type (Directly_Designated_Type (gnat_entity)));
- gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
- ! Comes_From_Source (gnat_entity),
- debug_info_p);
- save_gnu_tree (gnat_entity, gnu_decl, 0);
- this_made_decl = saved = 1;
-
- p->old_type = TREE_TYPE (gnu_type);
- p->full_type = Directly_Designated_Type (gnat_entity);
- p->next = defer_incomplete_list;
- defer_incomplete_list = p;
- break;
- }
-
- /* ... fall through ... */
-
- case E_Allocator_Type:
- case E_Access_Type:
- case E_Access_Attribute_Type:
- case E_Anonymous_Access_Type:
- case E_General_Access_Type:
- {
- Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
- Entity_Id gnat_desig_full
- = ((IN (Ekind (Etype (gnat_desig_type)),
- Incomplete_Or_Private_Kind))
- ? Full_View (gnat_desig_type) : 0);
- /* We want to know if we'll be seeing the freeze node for any
- incomplete type we may be pointing to. */
- int in_main_unit
- = (Present (gnat_desig_full)
- ? In_Extended_Main_Code_Unit (gnat_desig_full)
- : In_Extended_Main_Code_Unit (gnat_desig_type));
- int got_fat_p = 0;
- int made_dummy = 0;
- tree gnu_desig_type = 0;
-
- if (No (gnat_desig_full)
- && (Ekind (gnat_desig_type) == E_Class_Wide_Type
- || (Ekind (gnat_desig_type) == E_Class_Wide_Subtype
- && Present (Equivalent_Type (gnat_desig_type)))))
- {
- if (Present (Equivalent_Type (gnat_desig_type)))
- {
- gnat_desig_full = Equivalent_Type (gnat_desig_type);
- if (IN (Ekind (gnat_desig_full), Incomplete_Or_Private_Kind))
- gnat_desig_full = Full_View (gnat_desig_full);
- }
- else if (IN (Ekind (Root_Type (gnat_desig_type)),
- Incomplete_Or_Private_Kind))
- gnat_desig_full = Full_View (Root_Type (gnat_desig_type));
- }
-
- if (Present (gnat_desig_full) && Is_Concurrent_Type (gnat_desig_full))
- gnat_desig_full = Corresponding_Record_Type (gnat_desig_full);
-
- /* If either the designated type or its full view is an
- unconstrained array subtype, replace it with the type it's a
- subtype of. This avoids problems with multiple copies of
- unconstrained array types. */
- if (Ekind (gnat_desig_type) == E_Array_Subtype
- && ! Is_Constrained (gnat_desig_type))
- gnat_desig_type = Etype (gnat_desig_type);
- if (Present (gnat_desig_full)
- && Ekind (gnat_desig_full) == E_Array_Subtype
- && ! Is_Constrained (gnat_desig_full))
- gnat_desig_full = Etype (gnat_desig_full);
-
- /* If we are pointing to an incomplete type whose completion is an
- unconstrained array, make a fat pointer type instead of a pointer
- to VOID. The two types in our fields will be pointers to VOID and
- will be replaced in update_pointer_to. Similiarly, if the type
- itself is a dummy type or an unconstrained array. Also make
- a dummy TYPE_OBJECT_RECORD_TYPE in case we have any thin
- pointers to it. */
-
- if ((Present (gnat_desig_full)
- && Is_Array_Type (gnat_desig_full)
- && ! Is_Constrained (gnat_desig_full))
- || (present_gnu_tree (gnat_desig_type)
- && TYPE_IS_DUMMY_P (TREE_TYPE
- (get_gnu_tree (gnat_desig_type)))
- && Is_Array_Type (gnat_desig_type)
- && ! Is_Constrained (gnat_desig_type))
- || (present_gnu_tree (gnat_desig_type)
- && (TREE_CODE (TREE_TYPE (get_gnu_tree (gnat_desig_type)))
- == UNCONSTRAINED_ARRAY_TYPE)
- && (TYPE_POINTER_TO (TREE_TYPE
- (get_gnu_tree (gnat_desig_type)))
- == 0))
- || (No (gnat_desig_full) && ! in_main_unit
- && defer_incomplete_level != 0
- && ! present_gnu_tree (gnat_desig_type)
- && Is_Array_Type (gnat_desig_type)
- && ! Is_Constrained (gnat_desig_type)))
- {
- tree gnu_old
- = (present_gnu_tree (gnat_desig_type)
- ? gnat_to_gnu_type (gnat_desig_type)
- : make_dummy_type (gnat_desig_type));
- tree fields;
-
- /* Show the dummy we get will be a fat pointer. */
- got_fat_p = made_dummy = 1;
-
- /* If the call above got something that has a pointer, that
- pointer is our type. This could have happened either
- because the type was elaborated or because somebody
- else executed the code below. */
- gnu_type = TYPE_POINTER_TO (gnu_old);
- if (gnu_type == 0)
- {
- gnu_type = make_node (RECORD_TYPE);
- TYPE_UNCONSTRAINED_ARRAY (gnu_type) = gnu_old;
- TYPE_POINTER_TO (gnu_old) = gnu_type;
-
- set_lineno (gnat_entity, 0);
- fields
- = chainon (chainon (NULL_TREE,
- create_field_decl
- (get_identifier ("P_ARRAY"),
- ptr_void_type_node, gnu_type,
- 0, 0, 0, 0)),
- create_field_decl (get_identifier ("P_BOUNDS"),
- ptr_void_type_node,
- gnu_type, 0, 0, 0, 0));
-
- /* Make sure we can place this into a register. */
- TYPE_ALIGN (gnu_type)
- = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
- TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
- finish_record_type (gnu_type, fields, 0, 1);
-
- TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
- TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
- = concat_id_with_name (get_entity_name (gnat_desig_type),
- "XUT");
- TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
- }
- }
-
- /* If we already know what the full type is, use it. */
- else if (Present (gnat_desig_full)
- && present_gnu_tree (gnat_desig_full))
- gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
-
- /* Get the type of the thing we are to point to and build a pointer
- to it. If it is a reference to an incomplete or private type with a
- full view that is a record, make a dummy type node and get the
- actual type later when we have verified it is safe. */
- else if (! in_main_unit
- && ! present_gnu_tree (gnat_desig_type)
- && Present (gnat_desig_full)
- && ! present_gnu_tree (gnat_desig_full)
- && Is_Record_Type (gnat_desig_full))
- {
- gnu_desig_type = make_dummy_type (gnat_desig_type);
- made_dummy = 1;
- }
-
- /* Likewise if we are pointing to a record or array and we are to defer
- elaborating incomplete types. We do this since this access type
- may be the full view of some private type. Note that the
- unconstrained array case is handled above. */
- else if ((! in_main_unit || imported_p) && defer_incomplete_level != 0
- && ! present_gnu_tree (gnat_desig_type)
- && ((Is_Record_Type (gnat_desig_type)
- || Is_Array_Type (gnat_desig_type))
- || (Present (gnat_desig_full)
- && (Is_Record_Type (gnat_desig_full)
- || Is_Array_Type (gnat_desig_full)))))
- {
- gnu_desig_type = make_dummy_type (gnat_desig_type);
- made_dummy = 1;
- }
- else if (gnat_desig_type == gnat_entity)
- {
- gnu_type = build_pointer_type (make_node (VOID_TYPE));
- TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
- }
- else
- gnu_desig_type = gnat_to_gnu_type (gnat_desig_type);
-
- /* It is possible that the above call to gnat_to_gnu_type resolved our
- type. If so, just return it. */
- if (present_gnu_tree (gnat_entity))
- {
- maybe_present = 1;
- break;
- }
-
- /* If we have a GCC type for the designated type, possibly
- modify it if we are pointing only to constant objects and then
- make a pointer to it. Don't do this for unconstrained arrays. */
- if (gnu_type == 0 && gnu_desig_type != 0)
- {
- if (Is_Access_Constant (gnat_entity)
- && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
- gnu_desig_type
- = build_qualified_type (gnu_desig_type,
- (TYPE_QUALS (gnu_desig_type)
- | TYPE_QUAL_CONST));
-
- gnu_type = build_pointer_type (gnu_desig_type);
- }
-
- /* If we are not defining this object and we made a dummy pointer,
- save our current definition, evaluate the actual type, and replace
- the tentative type we made with the actual one. If we are to defer
- actually looking up the actual type, make an entry in the
- deferred list. */
-
- if (! in_main_unit && made_dummy)
- {
- tree gnu_old_type
- = TYPE_FAT_POINTER_P (gnu_type)
- ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
-
- if (esize == POINTER_SIZE
- && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
- gnu_type
- = build_pointer_type
- (TYPE_OBJECT_RECORD_TYPE
- (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
-
- gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
- ! Comes_From_Source (gnat_entity),
- debug_info_p);
- save_gnu_tree (gnat_entity, gnu_decl, 0);
- this_made_decl = saved = 1;
-
- if (defer_incomplete_level == 0)
- update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
- gnat_to_gnu_type (gnat_desig_type));
- else
- {
- struct incomplete *p
- = (struct incomplete *) xmalloc (sizeof (struct incomplete));
-
- p->old_type = gnu_old_type;
- p->full_type = gnat_desig_type;
- p->next = defer_incomplete_list;
- defer_incomplete_list = p;
- }
- }
- }
- break;
-
- case E_Access_Protected_Subprogram_Type:
- if (type_annotate_only && No (Equivalent_Type (gnat_entity)))
- gnu_type = build_pointer_type (void_type_node);
- else
- /* The runtime representation is the equivalent type. */
- gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
-
- if (Is_Itype (Directly_Designated_Type (gnat_entity))
- && ! present_gnu_tree (Directly_Designated_Type (gnat_entity))
- && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
- && ! Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
- gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
- NULL_TREE, 0);
-
- break;
-
- case E_Access_Subtype:
-
- /* We treat this as identical to its base type; any constraint is
- meaningful only to the front end.
-
- The designated type must be elaborated as well, if it does
- not have its own freeze node. Designated (sub)types created
- for constrained components of records with discriminants are
- not frozen by the front end and thus not elaborated by gigi,
- because their use may appear before the base type is frozen,
- and because it is not clear that they are needed anywhere in
- Gigi. With the current model, there is no correct place where
- they could be elaborated. */
-
- gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
- if (Is_Itype (Directly_Designated_Type (gnat_entity))
- && ! present_gnu_tree (Directly_Designated_Type (gnat_entity))
- && Is_Frozen (Directly_Designated_Type (gnat_entity))
- && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
- {
- /* If we are not defining this entity, and we have incomplete
- entities being processed above us, make a dummy type and
- elaborate it later. */
- if (! definition && defer_incomplete_level != 0)
- {
- struct incomplete *p
- = (struct incomplete *) xmalloc (sizeof (struct incomplete));
- tree gnu_ptr_type
- = build_pointer_type
- (make_dummy_type (Directly_Designated_Type (gnat_entity)));
-
- p->old_type = TREE_TYPE (gnu_ptr_type);
- p->full_type = Directly_Designated_Type (gnat_entity);
- p->next = defer_incomplete_list;
- defer_incomplete_list = p;
- }
- else
- gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
- NULL_TREE, 0);
- }
-
- maybe_present = 1;
- break;
-
- /* Subprogram Entities
-
- The following access functions are defined for subprograms (functions
- or procedures):
-
- First_Formal The first formal parameter.
- Is_Imported Indicates that the subprogram has appeared in
- an INTERFACE or IMPORT pragma. For now we
- assume that the external language is C.
- Is_Inlined True if the subprogram is to be inlined.
-
- In addition for function subprograms we have:
-
- Etype Return type of the function.
-
- Each parameter is first checked by calling must_pass_by_ref on its
- type to determine if it is passed by reference. For parameters which
- are copied in, if they are Ada IN OUT or OUT parameters, their return
- value becomes part of a record which becomes the return type of the
- function (C function - note that this applies only to Ada procedures
- so there is no Ada return type). Additional code to store back the
- parameters will be generated on the caller side. This transformation
- is done here, not in the front-end.
-
- The intended result of the transformation can be seen from the
- equivalent source rewritings that follow:
-
- struct temp {int a,b};
- procedure P (A,B: IN OUT ...) is temp P (int A,B) {
- .. ..
- end P; return {A,B};
- }
- procedure call
-
- {
- temp t;
- P(X,Y); t = P(X,Y);
- X = t.a , Y = t.b;
- }
-
- For subprogram types we need to perform mainly the same conversions to
- GCC form that are needed for procedures and function declarations. The
- only difference is that at the end, we make a type declaration instead
- of a function declaration. */
-
- case E_Subprogram_Type:
- case E_Function:
- case E_Procedure:
- {
- /* The first GCC parameter declaration (a PARM_DECL node). The
- PARM_DECL nodes are chained through the TREE_CHAIN field, so this
- actually is the head of this parameter list. */
- tree gnu_param_list = NULL_TREE;
- /* The type returned by a function. If the subprogram is a procedure
- this type should be void_type_node. */
- tree gnu_return_type = void_type_node;
- /* List of fields in return type of procedure with copy in copy out
- parameters. */
- tree gnu_field_list = NULL_TREE;
- /* Non-null for subprograms containing parameters passed by copy in
- copy out (Ada IN OUT or OUT parameters not passed by reference),
- in which case it is the list of nodes used to specify the values of
- the in out/out parameters that are returned as a record upon
- procedure return. The TREE_PURPOSE of an element of this list is
- a field of the record and the TREE_VALUE is the PARM_DECL
- corresponding to that field. This list will be saved in the
- TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
- tree gnu_return_list = NULL_TREE;
- Entity_Id gnat_param;
- int inline_flag = Is_Inlined (gnat_entity);
- int public_flag = Is_Public (gnat_entity);
- int extern_flag
- = (Is_Public (gnat_entity) && !definition) || imported_p;
- int pure_flag = Is_Pure (gnat_entity);
- int volatile_flag = No_Return (gnat_entity);
- int returns_by_ref = 0;
- int returns_unconstrained = 0;
- tree gnu_ext_name = NULL_TREE;
- int has_copy_in_out = 0;
- int parmnum;
-
- if (kind == E_Subprogram_Type && ! definition)
- /* A parameter may refer to this type, so defer completion
- of any incomplete types. */
- defer_incomplete_level++, this_deferred = 1;
-
- /* If the subprogram has an alias, it is probably inherited, so
- we can use the original one. If the original "subprogram"
- is actually an enumeration literal, it may be the first use
- of its type, so we must elaborate that type now. */
- if (Present (Alias (gnat_entity)))
- {
- if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
- gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
-
- gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
- gnu_expr, 0);
-
- /* Elaborate any Itypes in the parameters of this entity. */
- for (gnat_temp = First_Formal (gnat_entity);
- Present (gnat_temp);
- gnat_temp = Next_Formal_With_Extras (gnat_temp))
- if (Is_Itype (Etype (gnat_temp)))
- gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
-
- break;
- }
-
- if (kind == E_Function || kind == E_Subprogram_Type)
- gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
-
- /* If this function returns by reference, make the actual
- return type of this function the pointer and mark the decl. */
- if (Returns_By_Ref (gnat_entity))
- {
- returns_by_ref = 1;
-
- gnu_return_type = build_pointer_type (gnu_return_type);
- }
-
- /* If we are supposed to return an unconstrained array,
- actually return a fat pointer and make a note of that. Return
- a pointer to an unconstrained record of variable size. */
- else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
- {
- gnu_return_type = TREE_TYPE (gnu_return_type);
- returns_unconstrained = 1;
- }
-
- /* If the type requires a transient scope, the result is allocated
- on the secondary stack, so the result type of the function is
- just a pointer. */
- else if (Requires_Transient_Scope (Etype (gnat_entity)))
- {
- gnu_return_type = build_pointer_type (gnu_return_type);
- returns_unconstrained = 1;
- }
-
- /* If the type is a padded type and the underlying type would not
- be passed by reference or this function has a foreign convention,
- return the underlying type. */
- else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_return_type)
- && (! default_pass_by_ref (TREE_TYPE
- (TYPE_FIELDS (gnu_return_type)))
- || Has_Foreign_Convention (gnat_entity)))
- gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
-
- /* Look at all our parameters and get the type of
- each. While doing this, build a copy-out structure if
- we need one. */
-
- for (gnat_param = First_Formal (gnat_entity), parmnum = 0;
- Present (gnat_param);
- gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
- {
- tree gnu_param_name = get_entity_name (gnat_param);
- tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
- tree gnu_param, gnu_field;
- int by_ref_p = 0;
- int by_descr_p = 0;
- int by_component_ptr_p = 0;
- int copy_in_copy_out_flag = 0;
- int req_by_copy = 0, req_by_ref = 0;
-
- /* See if a Mechanism was supplied that forced this
- parameter to be passed one way or another. */
- if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
- req_by_copy = 1;
- else if (Mechanism (gnat_param) == Default)
- ;
- else if (Mechanism (gnat_param) == By_Copy)
- req_by_copy = 1;
- else if (Mechanism (gnat_param) == By_Reference)
- req_by_ref = 1;
- else if (Mechanism (gnat_param) <= By_Descriptor)
- by_descr_p = 1;
- else if (Mechanism (gnat_param) > 0)
- {
- if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
- || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
- || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
- Mechanism (gnat_param)))
- req_by_ref = 1;
- else
- req_by_copy = 1;
- }
- else
- post_error ("unsupported mechanism for&", gnat_param);
-
- /* If this is either a foreign function or if the
- underlying type won't be passed by refererence, strip off
- possible padding type. */
- if (TREE_CODE (gnu_param_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_param_type)
- && (req_by_ref || Has_Foreign_Convention (gnat_entity)
- || ! must_pass_by_ref (TREE_TYPE (TYPE_FIELDS
- (gnu_param_type)))))
- gnu_param_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
-
- /* If this is an IN parameter it is read-only, so make a variant
- of the type that is read-only.
-
- ??? However, if this is an unconstrained array, that type can
- be very complex. So skip it for now. Likewise for any other
- self-referential type. */
- if (Ekind (gnat_param) == E_In_Parameter
- && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
- && ! (TYPE_SIZE (gnu_param_type) != 0
- && TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
- && contains_placeholder_p (TYPE_SIZE (gnu_param_type))))
- gnu_param_type
- = build_qualified_type (gnu_param_type,
- (TYPE_QUALS (gnu_param_type)
- | TYPE_QUAL_CONST));
-
- /* For foreign conventions, pass arrays as a pointer to the
- underlying type. First check for unconstrained array and get
- the underlying array. Then get the component type and build
- a pointer to it. */
- if (Has_Foreign_Convention (gnat_entity)
- && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
- gnu_param_type
- = TREE_TYPE (TREE_TYPE (TYPE_FIELDS
- (TREE_TYPE (gnu_param_type))));
-
- if (by_descr_p)
- gnu_param_type
- = build_pointer_type
- (build_vms_descriptor (gnu_param_type,
- Mechanism (gnat_param),
- gnat_entity));
-
- else if (Has_Foreign_Convention (gnat_entity)
- && ! req_by_copy
- && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
- {
- /* Strip off any multi-dimensional entries, then strip
- off the last array to get the component type. */
- while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
- && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
- gnu_param_type = TREE_TYPE (gnu_param_type);
-
- by_component_ptr_p = 1;
- gnu_param_type = TREE_TYPE (gnu_param_type);
-
- if (Ekind (gnat_param) == E_In_Parameter)
- gnu_param_type
- = build_qualified_type (gnu_param_type,
- (TYPE_QUALS (gnu_param_type)
- | TYPE_QUAL_CONST));
-
- gnu_param_type = build_pointer_type (gnu_param_type);
- }
-
- /* Fat pointers are passed as thin pointers for foreign
- conventions. */
- else if (Has_Foreign_Convention (gnat_entity)
- && TYPE_FAT_POINTER_P (gnu_param_type))
- gnu_param_type
- = make_type_from_size (gnu_param_type,
- size_int (POINTER_SIZE), 0);
-
- /* If we must pass or were requested to pass by reference, do so.
- If we were requested to pass by copy, do so.
- Otherwise, for foreign conventions, pass all in out parameters
- or aggregates by reference. For COBOL and Fortran, pass
- all integer and FP types that way too. For Convention Ada,
- use the standard Ada default. */
- else if (must_pass_by_ref (gnu_param_type) || req_by_ref
- || (! req_by_copy
- && ((Has_Foreign_Convention (gnat_entity)
- && (Ekind (gnat_param) != E_In_Parameter
- || AGGREGATE_TYPE_P (gnu_param_type)))
- || (((Convention (gnat_entity)
- == Convention_Fortran)
- || (Convention (gnat_entity)
- == Convention_COBOL))
- && (INTEGRAL_TYPE_P (gnu_param_type)
- || FLOAT_TYPE_P (gnu_param_type)))
- /* For convention Ada, see if we pass by reference
- by default. */
- || (! Has_Foreign_Convention (gnat_entity)
- && default_pass_by_ref (gnu_param_type)))))
- {
- gnu_param_type = build_reference_type (gnu_param_type);
- by_ref_p = 1;
- }
-
- else if (Ekind (gnat_param) != E_In_Parameter)
- copy_in_copy_out_flag = 1;
-
- if (req_by_copy && (by_ref_p || by_component_ptr_p))
- post_error ("?cannot pass & by copy", gnat_param);
-
- /* If this is an OUT parameter that isn't passed by reference
- and isn't a pointer or aggregate, we don't make a PARM_DECL
- for it. Instead, it will be a VAR_DECL created when we process
- the procedure. For the special parameter of Valued_Procedure,
- never pass it in. */
- if (Ekind (gnat_param) == E_Out_Parameter && ! by_ref_p
- && ((Is_Valued_Procedure (gnat_entity) && parmnum == 0)
- || (! by_descr_p
- && ! POINTER_TYPE_P (gnu_param_type)
- && ! AGGREGATE_TYPE_P (gnu_param_type))))
- gnu_param = 0;
- else
- {
- set_lineno (gnat_param, 0);
- gnu_param
- = create_param_decl
- (gnu_param_name, gnu_param_type,
- by_ref_p || by_component_ptr_p
- || Ekind (gnat_param) == E_In_Parameter);
-
- DECL_BY_REF_P (gnu_param) = by_ref_p;
- DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr_p;
- DECL_BY_DESCRIPTOR_P (gnu_param) = by_descr_p;
- DECL_POINTS_TO_READONLY_P (gnu_param)
- = (Ekind (gnat_param) == E_In_Parameter
- && (by_ref_p || by_component_ptr_p));
- save_gnu_tree (gnat_param, gnu_param, 0);
- gnu_param_list = chainon (gnu_param, gnu_param_list);
-
- /* If a parameter is a pointer, this function may modify
- memory through it and thus shouldn't be considered
- a pure function. Also, the memory may be modified
- between two calls, so they can't be CSE'ed. The latter
- case also handles by-ref parameters. */
- if (POINTER_TYPE_P (gnu_param_type)
- || TYPE_FAT_POINTER_P (gnu_param_type))
- pure_flag = 0;
- }
-
- if (copy_in_copy_out_flag)
- {
- if (! has_copy_in_out)
- {
- if (TREE_CODE (gnu_return_type) != VOID_TYPE)
- gigi_abort (111);
-
- gnu_return_type = make_node (RECORD_TYPE);
- TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
- has_copy_in_out = 1;
- }
-
- set_lineno (gnat_param, 0);
- gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
- gnu_return_type, 0, 0, 0, 0);
- TREE_CHAIN (gnu_field) = gnu_field_list;
- gnu_field_list = gnu_field;
- gnu_return_list = tree_cons (gnu_field, gnu_param,
- gnu_return_list);
- }
- }
-
- /* Do not compute record for out parameters if subprogram is
- stubbed since structures are incomplete for the back-end. */
- if (gnu_field_list != 0
- && Convention (gnat_entity) != Convention_Stubbed)
- finish_record_type (gnu_return_type, nreverse (gnu_field_list),
- 0, 0);
-
- /* If we have a CICO list but it has only one entry, we convert
- this function into a function that simply returns that one
- object. */
- if (list_length (gnu_return_list) == 1)
- gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
-
- if (Convention (gnat_entity) == Convention_Stdcall)
- {
- struct attrib *attr
- = (struct attrib *) xmalloc (sizeof (struct attrib));
-
- attr->next = attr_list;
- attr->type = ATTR_MACHINE_ATTRIBUTE;
- attr->name = get_identifier ("stdcall");
- attr->arg = NULL_TREE;
- attr->error_point = gnat_entity;
- attr_list = attr;
- }
-
- /* Both lists ware built in reverse. */
- gnu_param_list = nreverse (gnu_param_list);
- gnu_return_list = nreverse (gnu_return_list);
-
- gnu_type
- = create_subprog_type (gnu_return_type, gnu_param_list,
- gnu_return_list, returns_unconstrained,
- returns_by_ref,
- Function_Returns_With_DSP (gnat_entity));
-
- /* ??? For now, don't consider nested functions pure. */
- if (! global_bindings_p ())
- pure_flag = 0;
-
- gnu_type
- = build_qualified_type (gnu_type,
- (TYPE_QUALS (gnu_type)
- | (TYPE_QUAL_CONST * pure_flag)
- | (TYPE_QUAL_VOLATILE * volatile_flag)));
-
- /* Top-level or external functions need to have an assembler name.
- This is passed to create_subprog_decl through the ext_name argument.
- For Pragma Interface subprograms with no Pragma Interface_Name, the
- simple name already in entity_name is correct, and this is what is
- gotten when ext_name is NULL. If Interface_Name is specified, then
- the name is extracted from the N_String_Literal node containing the
- string specified in the Pragma. If there is no Pragma Interface,
- then the Ada fully qualified name is created. */
-
- if (Present (Interface_Name (gnat_entity))
- || ! (Is_Imported (gnat_entity) || Is_Exported (gnat_entity)))
- gnu_ext_name = create_concat_name (gnat_entity, 0);
-
- set_lineno (gnat_entity, 0);
-
- /* If we are defining the subprogram and it has an Address clause
- we must get the address expression from the saved GCC tree for the
- subprogram if it has a Freeze_Node. Otherwise, we elaborate
- the address expression here since the front-end has guaranteed
- in that case that the elaboration has no effects. If there is
- an Address clause and we are not defining the object, just
- make it a constant. */
- if (Present (Address_Clause (gnat_entity)))
- {
- tree gnu_address = 0;
-
- if (definition)
- gnu_address
- = (present_gnu_tree (gnat_entity)
- ? get_gnu_tree (gnat_entity)
- : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
-
- save_gnu_tree (gnat_entity, NULL_TREE, 0);
-
- gnu_type = build_reference_type (gnu_type);
- if (gnu_address != 0)
- gnu_address = convert (gnu_type, gnu_address);
-
- gnu_decl
- = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
- gnu_address, 0, Is_Public (gnat_entity),
- extern_flag, 0, 0);
- DECL_BY_REF_P (gnu_decl) = 1;
- }
-
- else if (kind == E_Subprogram_Type)
- gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
- ! Comes_From_Source (gnat_entity),
- debug_info_p);
- else
- {
- gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name,
- gnu_type, gnu_param_list,
- inline_flag, public_flag,
- extern_flag, attr_list);
- DECL_STUBBED_P (gnu_decl)
- = Convention (gnat_entity) == Convention_Stubbed;
- }
- }
- break;
-
- case E_Incomplete_Type:
- case E_Private_Type:
- case E_Limited_Private_Type:
- case E_Record_Type_With_Private:
- case E_Private_Subtype:
- case E_Limited_Private_Subtype:
- case E_Record_Subtype_With_Private:
-
- /* If this type does not have a full view in the unit we are
- compiling, then just get the type from its Etype. */
- if (No (Full_View (gnat_entity)))
- {
- /* If this is an incomplete type with no full view, it must
- be a Taft Amendement type, so just return a dummy type. */
- if (kind == E_Incomplete_Type)
- gnu_type = make_dummy_type (gnat_entity);
-
- else if (Present (Underlying_Full_View (gnat_entity)))
- gnu_decl = gnat_to_gnu_entity (Underlying_Full_View (gnat_entity),
- NULL_TREE, 0);
- else
- {
- gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
- NULL_TREE, 0);
- maybe_present = 1;
- }
-
- break;
- }
-
- /* Otherwise, if we are not defining the type now, get the
- type from the full view. But always get the type from the full
- view for define on use types, since otherwise we won't see them! */
-
- else if (! definition
- || (Is_Itype (Full_View (gnat_entity))
- && No (Freeze_Node (gnat_entity)))
- || (Is_Itype (gnat_entity)
- && No (Freeze_Node (Full_View (gnat_entity)))))
- {
- gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
- NULL_TREE, 0);
- maybe_present = 1;
- break;
- }
-
- /* For incomplete types, make a dummy type entry which will be
- replaced later. */
- gnu_type = make_dummy_type (gnat_entity);
-
- /* Save this type as the full declaration's type so we can do any needed
- updates when we see it. */
- set_lineno (gnat_entity, 0);
- gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
- ! Comes_From_Source (gnat_entity),
- debug_info_p);
- save_gnu_tree (Full_View (gnat_entity), gnu_decl, 0);
- break;
-
- /* Simple class_wide types are always viewed as their root_type
- by Gigi unless an Equivalent_Type is specified. */
- case E_Class_Wide_Type:
- if (Present (Equivalent_Type (gnat_entity)))
- gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
- else
- gnu_type = gnat_to_gnu_type (Root_Type (gnat_entity));
-
- maybe_present = 1;
- break;
-
- case E_Task_Type:
- case E_Task_Subtype:
- case E_Protected_Type:
- case E_Protected_Subtype:
- if (type_annotate_only && No (Corresponding_Record_Type (gnat_entity)))
- gnu_type = void_type_node;
- else
- gnu_type = gnat_to_gnu_type (Corresponding_Record_Type (gnat_entity));
-
- maybe_present = 1;
- break;
-
- case E_Label:
- gnu_decl = create_label_decl (gnu_entity_id);
- break;
-
- case E_Block:
- case E_Loop:
- /* Nothing at all to do here, so just return an ERROR_MARK and claim
- we've already saved it, so we don't try to. */
- gnu_decl = error_mark_node;
- saved = 1;
- break;
-
- default:
- gigi_abort (113);
- }
-
- /* If we had a case where we evaluated another type and it might have
- defined this one, handle it here. */
- if (maybe_present && present_gnu_tree (gnat_entity))
- {
- gnu_decl = get_gnu_tree (gnat_entity);
- saved = 1;
- }
-
- /* If we are processing a type and there is either no decl for it or
- we just made one, do some common processing for the type, such as
- handling alignment and possible padding. */
-
- if ((gnu_decl == 0 || this_made_decl) && IN (kind, Type_Kind))
- {
- if (Is_Tagged_Type (gnat_entity))
- TYPE_ALIGN_OK_P (gnu_type) = 1;
-
- if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
- TYPE_BY_REFERENCE_P (gnu_type) = 1;
-
- /* ??? Don't set the size for a String_Literal since it is either
- confirming or we don't handle it properly (if the low bound is
- non-constant). */
- if (gnu_size == 0 && kind != E_String_Literal_Subtype)
- gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
- TYPE_DECL, 0, Has_Size_Clause (gnat_entity));
-
- /* If a size was specified, see if we can make a new type of that size
- by rearranging the type, for example from a fat to a thin pointer. */
- if (gnu_size != 0)
- {
- gnu_type
- = make_type_from_size (gnu_type, gnu_size,
- Has_Biased_Representation (gnat_entity));
-
- if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
- && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
- gnu_size = 0;
- }
-
- /* If the alignment hasn't already been processed and this is
- not an unconstrained array, see if an alignment is specified.
- If not, we pick a default alignment for atomic objects. */
- if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
- ;
- else if (Known_Alignment (gnat_entity))
- align = validate_alignment (Alignment (gnat_entity), gnat_entity,
- TYPE_ALIGN (gnu_type));
- else if (Is_Atomic (gnat_entity) && gnu_size == 0
- && host_integerp (TYPE_SIZE (gnu_type), 1)
- && integer_pow2p (TYPE_SIZE (gnu_type)))
- align = MIN (BIGGEST_ALIGNMENT,
- tree_low_cst (TYPE_SIZE (gnu_type), 1));
- else if (Is_Atomic (gnat_entity) && gnu_size != 0
- && host_integerp (gnu_size, 1)
- && integer_pow2p (gnu_size))
- align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
-
- /* See if we need to pad the type. If we did, and made a record,
- the name of the new type may be changed. So get it back for
- us when we make the new TYPE_DECL below. */
- gnu_type = maybe_pad_type (gnu_type, gnu_size, align,
- gnat_entity, "PAD", 1, definition, 0);
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_type))
- {
- gnu_entity_id = TYPE_NAME (gnu_type);
- if (TREE_CODE (gnu_entity_id) == TYPE_DECL)
- gnu_entity_id = DECL_NAME (gnu_entity_id);
- }
-
- set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
-
- /* If we are at global level, GCC will have applied variable_size to
- the type, but that won't have done anything. So, if it's not
- a constant or self-referential, call elaborate_expression_1 to
- make a variable for the size rather than calculating it each time.
- Handle both the RM size and the actual size. */
- if (global_bindings_p ()
- && TYPE_SIZE (gnu_type) != 0
- && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST
- && ! contains_placeholder_p (TYPE_SIZE (gnu_type)))
- {
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
- TYPE_SIZE (gnu_type), 0))
- TYPE_ADA_SIZE (gnu_type) = TYPE_SIZE (gnu_type)
- = elaborate_expression_1 (gnat_entity, gnat_entity,
- TYPE_SIZE (gnu_type),
- get_identifier ("SIZE"),
- definition, 0);
- else if (TREE_CODE (gnu_type) == RECORD_TYPE)
- {
- TYPE_ADA_SIZE (gnu_type)
- = elaborate_expression_1 (gnat_entity, gnat_entity,
- TYPE_ADA_SIZE (gnu_type),
- get_identifier ("RM_SIZE"),
- definition, 0);
- TYPE_SIZE (gnu_type)
- = elaborate_expression_1 (gnat_entity, gnat_entity,
- TYPE_SIZE (gnu_type),
- get_identifier ("SIZE"),
- definition, 0);
- TYPE_SIZE_UNIT (gnu_type)
- = elaborate_expression_1 (gnat_entity, gnat_entity,
- TYPE_SIZE_UNIT (gnu_type),
- get_identifier ("SIZE_UNIT"),
- definition, 0);
- }
- else
- {
- TYPE_SIZE (gnu_type)
- = elaborate_expression_1 (gnat_entity, gnat_entity,
- TYPE_SIZE (gnu_type),
- get_identifier ("SIZE"),
- definition, 0);
- TYPE_SIZE_UNIT (gnu_type)
- = elaborate_expression_1 (gnat_entity, gnat_entity,
- TYPE_SIZE_UNIT (gnu_type),
- get_identifier ("SIZE_UNIT"),
- definition, 0);
- }
- }
-
- /* If this is a record type or subtype, call elaborate_expression_1 on
- any field position. Do this for both global and local types.
- Skip any fields that we haven't made trees for to avoid problems with
- class wide types. */
- if (IN (kind, Record_Kind))
- for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
- gnat_temp = Next_Entity (gnat_temp))
- if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
- {
- tree gnu_field = get_gnu_tree (gnat_temp);
-
- if (TREE_CODE (DECL_FIELD_OFFSET (gnu_field)) != INTEGER_CST
- && ! contains_placeholder_p (DECL_FIELD_OFFSET (gnu_field)))
- DECL_FIELD_OFFSET (gnu_field)
- = elaborate_expression_1 (gnat_temp, gnat_temp,
- DECL_FIELD_OFFSET (gnu_field),
- get_identifier ("OFFSET"),
- definition, 0);
- }
-
- gnu_type = build_qualified_type (gnu_type,
- (TYPE_QUALS (gnu_type)
- | (TYPE_QUAL_VOLATILE
- * Is_Volatile (gnat_entity))));
-
- if (Is_Atomic (gnat_entity))
- check_ok_for_atomic (gnu_type, gnat_entity, 0);
-
- if (Known_Alignment (gnat_entity))
- TYPE_USER_ALIGN (gnu_type) = 1;
-
- if (gnu_decl == 0)
- {
- set_lineno (gnat_entity, 0);
- gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
- ! Comes_From_Source (gnat_entity),
- debug_info_p);
- }
- else
- TREE_TYPE (gnu_decl) = gnu_type;
- }
-
- if (IN (kind, Type_Kind) && ! TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
- {
- gnu_type = TREE_TYPE (gnu_decl);
-
- /* Back-annotate the Alignment of the type if not already in the
- tree. Likewise for sizes. */
- if (Unknown_Alignment (gnat_entity))
- Set_Alignment (gnat_entity,
- UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
-
- if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type) != 0)
- {
- /* If the size is self-referential, we annotate the maximum
- value of that size. */
- tree gnu_size = TYPE_SIZE (gnu_type);
-
- if (contains_placeholder_p (gnu_size))
- gnu_size = max_size (gnu_size, 1);
-
- Set_Esize (gnat_entity, annotate_value (gnu_size));
- }
-
- if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type) != 0)
- Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
- }
-
- if (! Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
- DECL_ARTIFICIAL (gnu_decl) = 1;
-
- if (! debug_info_p && DECL_P (gnu_decl)
- && TREE_CODE (gnu_decl) != FUNCTION_DECL)
- DECL_IGNORED_P (gnu_decl) = 1;
-
- /* If this decl is really indirect, adjust it. */
- if (TREE_CODE (gnu_decl) == VAR_DECL)
- adjust_decl_rtl (gnu_decl);
-
- /* If we haven't already, associate the ..._DECL node that we just made with
- the input GNAT entity node. */
- if (! saved)
- save_gnu_tree (gnat_entity, gnu_decl, 0);
-
- /* If this is an enumeral or floating-point type, we were not able to set
- the bounds since they refer to the type. These bounds are always static.
-
- For enumeration types, also write debugging information and declare the
- enumeration literal table, if needed. */
-
- if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
- || (kind == E_Floating_Point_Type && ! Vax_Float (gnat_entity)))
- {
- tree gnu_scalar_type = gnu_type;
-
- /* If this is a padded type, we need to use the underlying type. */
- if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_scalar_type))
- gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
-
- /* If this is a floating point type and we haven't set a floating
- point type yet, use this in the evaluation of the bounds. */
- if (longest_float_type_node == 0 && kind == E_Floating_Point_Type)
- longest_float_type_node = gnu_type;
-
- TYPE_MIN_VALUE (gnu_scalar_type)
- = gnat_to_gnu (Type_Low_Bound (gnat_entity));
- TYPE_MAX_VALUE (gnu_scalar_type)
- = gnat_to_gnu (Type_High_Bound (gnat_entity));
-
- if (kind == E_Enumeration_Type)
- {
- TYPE_STUB_DECL (gnu_scalar_type) = gnu_decl;
-
- /* Since this has both a typedef and a tag, avoid outputting
- the name twice. */
- DECL_ARTIFICIAL (gnu_decl) = 1;
- rest_of_type_compilation (gnu_scalar_type, global_bindings_p ());
- }
- }
-
- /* If we deferred processing of incomplete types, re-enable it. If there
- were no other disables and we have some to process, do so. */
- if (this_deferred && --defer_incomplete_level == 0
- && defer_incomplete_list != 0)
- {
- struct incomplete *incp = defer_incomplete_list;
- struct incomplete *next;
-
- defer_incomplete_list = 0;
- for (; incp; incp = next)
- {
- next = incp->next;
-
- if (incp->old_type != 0)
- update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
- gnat_to_gnu_type (incp->full_type));
- free (incp);
- }
- }
-
- /* If we are not defining this type, see if it's in the incomplete list.
- If so, handle that list entry now. */
- else if (! definition)
- {
- struct incomplete *incp;
-
- for (incp = defer_incomplete_list; incp; incp = incp->next)
- if (incp->old_type != 0 && incp->full_type == gnat_entity)
- {
- update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
- TREE_TYPE (gnu_decl));
- incp->old_type = 0;
- }
- }
-
- if (this_global)
- force_global--;
-
- if (Is_Packed_Array_Type (gnat_entity)
- && Is_Itype (Associated_Node_For_Itype (gnat_entity))
- && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity)))
- && ! present_gnu_tree (Associated_Node_For_Itype (gnat_entity)))
- gnat_to_gnu_entity (Associated_Node_For_Itype (gnat_entity), NULL_TREE, 0);
-
- return gnu_decl;
-}
-\f
-/* Given GNAT_ENTITY, elaborate all expressions that are required to
- be elaborated at the point of its definition, but do nothing else. */
-
-void
-elaborate_entity (gnat_entity)
- Entity_Id gnat_entity;
-{
- switch (Ekind (gnat_entity))
- {
- case E_Signed_Integer_Subtype:
- case E_Modular_Integer_Subtype:
- case E_Enumeration_Subtype:
- case E_Ordinary_Fixed_Point_Subtype:
- case E_Decimal_Fixed_Point_Subtype:
- case E_Floating_Point_Subtype:
- {
- Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
- Node_Id gnat_hb = Type_High_Bound (gnat_entity);
-
- /* ??? Tests for avoiding static constaint error expression
- is needed until the front stops generating bogus conversions
- on bounds of real types. */
-
- if (! Raises_Constraint_Error (gnat_lb))
- elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
- 1, 0, Needs_Debug_Info (gnat_entity));
- if (! Raises_Constraint_Error (gnat_hb))
- elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
- 1, 0, Needs_Debug_Info (gnat_entity));
- break;
- }
-
- case E_Record_Type:
- {
- Node_Id full_definition = Declaration_Node (gnat_entity);
- Node_Id record_definition = Type_Definition (full_definition);
-
- /* If this is a record extension, go a level further to find the
- record definition. */
- if (Nkind (record_definition) == N_Derived_Type_Definition)
- record_definition = Record_Extension_Part (record_definition);
- }
- break;
-
- case E_Record_Subtype:
- case E_Private_Subtype:
- case E_Limited_Private_Subtype:
- case E_Record_Subtype_With_Private:
- if (Is_Constrained (gnat_entity)
- && Has_Discriminants (Base_Type (gnat_entity))
- && Present (Discriminant_Constraint (gnat_entity)))
- {
- Node_Id gnat_discriminant_expr;
- Entity_Id gnat_field;
-
- for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
- gnat_discriminant_expr
- = First_Elmt (Discriminant_Constraint (gnat_entity));
- Present (gnat_field);
- gnat_field = Next_Discriminant (gnat_field),
- gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
- /* ??? For now, ignore access discriminants. */
- if (! Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
- elaborate_expression (Node (gnat_discriminant_expr),
- gnat_entity,
- get_entity_name (gnat_field), 1, 0, 0);
- }
- break;
-
- }
-}
-\f
-/* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
- any entities on its entity chain similarly. */
-
-void
-mark_out_of_scope (gnat_entity)
- Entity_Id gnat_entity;
-{
- Entity_Id gnat_sub_entity;
- unsigned int kind = Ekind (gnat_entity);
-
- /* If this has an entity list, process all in the list. */
- if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
- || IN (kind, Private_Kind)
- || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
- || kind == E_Function || kind == E_Generic_Function
- || kind == E_Generic_Package || kind == E_Generic_Procedure
- || kind == E_Loop || kind == E_Operator || kind == E_Package
- || kind == E_Package_Body || kind == E_Procedure
- || kind == E_Record_Type || kind == E_Record_Subtype
- || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
- for (gnat_sub_entity = First_Entity (gnat_entity);
- Present (gnat_sub_entity);
- gnat_sub_entity = Next_Entity (gnat_sub_entity))
- if (Scope (gnat_sub_entity) == gnat_entity
- && gnat_sub_entity != gnat_entity)
- mark_out_of_scope (gnat_sub_entity);
-
- /* Now clear this if it has been defined, but only do so if it isn't
- a subprogram or parameter. We could refine this, but it isn't
- worth it. If this is statically allocated, it is supposed to
- hang around out of cope. */
- if (present_gnu_tree (gnat_entity) && ! Is_Statically_Allocated (gnat_entity)
- && kind != E_Procedure && kind != E_Function && ! IN (kind, Formal_Kind))
- {
- save_gnu_tree (gnat_entity, NULL_TREE, 1);
- save_gnu_tree (gnat_entity, error_mark_node, 1);
- }
-}
-\f
-/* Return a TREE_LIST describing the substitutions needed to reflect
- discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
- them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
- of GNAT_SUBTYPE. The substitions can be in any order. TREE_PURPOSE
- gives the tree for the discriminant and TREE_VALUES is the replacement
- value. They are in the form of operands to substitute_in_expr.
- DEFINITION is as in gnat_to_gnu_entity. */
-
-static tree
-substitution_list (gnat_subtype, gnat_type, gnu_list, definition)
- Entity_Id gnat_subtype;
- Entity_Id gnat_type;
- tree gnu_list;
- int definition;
-{
- Entity_Id gnat_discrim;
- Node_Id gnat_value;
-
- if (No (gnat_type))
- gnat_type = Implementation_Base_Type (gnat_subtype);
-
- if (Has_Discriminants (gnat_type))
- for (gnat_discrim = First_Girder_Discriminant (gnat_type),
- gnat_value = First_Elmt (Girder_Constraint (gnat_subtype));
- Present (gnat_discrim);
- gnat_discrim = Next_Girder_Discriminant (gnat_discrim),
- gnat_value = Next_Elmt (gnat_value))
- /* Ignore access discriminants. */
- if (! Is_Access_Type (Etype (Node (gnat_value))))
- gnu_list = tree_cons (gnat_to_gnu_entity (gnat_discrim, NULL_TREE, 0),
- elaborate_expression
- (Node (gnat_value), gnat_subtype,
- get_entity_name (gnat_discrim), definition,
- 1, 0),
- gnu_list);
-
- return gnu_list;
-}
-\f
-/* For the following two functions: for each GNAT entity, the GCC
- tree node used as a dummy for that entity, if any. */
-
-static tree *dummy_node_table;
-
-/* Initialize the above table. */
-
-void
-init_dummy_type ()
-{
- Node_Id gnat_node;
-
- dummy_node_table = (tree *) xmalloc (max_gnat_nodes * sizeof (tree));
- ggc_add_tree_root (dummy_node_table, max_gnat_nodes);
-
- for (gnat_node = 0; gnat_node < max_gnat_nodes; gnat_node++)
- dummy_node_table[gnat_node] = NULL_TREE;
-
- dummy_node_table -= First_Node_Id;
-}
-
-/* Make a dummy type corresponding to GNAT_TYPE. */
-
-tree
-make_dummy_type (gnat_type)
- Entity_Id gnat_type;
-{
- Entity_Id gnat_underlying;
- tree gnu_type;
-
- /* Find a full type for GNAT_TYPE, taking into account any class wide
- types. */
- if (Is_Class_Wide_Type (gnat_type) && Present (Equivalent_Type (gnat_type)))
- gnat_type = Equivalent_Type (gnat_type);
- else if (Ekind (gnat_type) == E_Class_Wide_Type)
- gnat_type = Root_Type (gnat_type);
-
- for (gnat_underlying = gnat_type;
- (IN (Ekind (gnat_underlying), Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_underlying)));
- gnat_underlying = Full_View (gnat_underlying))
- ;
-
- /* If it there already a dummy type, use that one. Else make one. */
- if (dummy_node_table[gnat_underlying])
- return dummy_node_table[gnat_underlying];
-
- /* If this is a record, make this a RECORD_TYPE or UNION_TYPE; else make
- it a VOID_TYPE. */
- if (Is_Record_Type (gnat_underlying))
- gnu_type = make_node (Is_Unchecked_Union (gnat_underlying)
- ? UNION_TYPE : RECORD_TYPE);
- else
- gnu_type = make_node (ENUMERAL_TYPE);
-
- TYPE_NAME (gnu_type) = get_entity_name (gnat_type);
- if (AGGREGATE_TYPE_P (gnu_type))
- TYPE_STUB_DECL (gnu_type)
- = pushdecl (build_decl (TYPE_DECL, NULL_TREE, gnu_type));
-
- TYPE_DUMMY_P (gnu_type) = 1;
- dummy_node_table[gnat_underlying] = gnu_type;
-
- return gnu_type;
-}
-\f
-/* Return 1 if the size represented by GNU_SIZE can be handled by an
- allocation. If STATIC_P is non-zero, consider only what can be
- done with a static allocation. */
-
-static int
-allocatable_size_p (gnu_size, static_p)
- tree gnu_size;
- int static_p;
-{
- /* If this is not a static allocation, the only case we want to forbid
- is an overflowing size. That will be converted into a raise a
- Storage_Error. */
- if (! static_p)
- return ! (TREE_CODE (gnu_size) == INTEGER_CST
- && TREE_CONSTANT_OVERFLOW (gnu_size));
-
- /* Otherwise, we need to deal with both variable sizes and constant
- sizes that won't fit in a host int. */
- return host_integerp (gnu_size, 1);
-}
-\f
-/* Return a list of attributes for GNAT_ENTITY, if any. */
-
-static struct attrib *
-build_attr_list (gnat_entity)
- Entity_Id gnat_entity;
-{
- struct attrib *attr_list = 0;
- Node_Id gnat_temp;
-
- for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
- gnat_temp = Next_Rep_Item (gnat_temp))
- if (Nkind (gnat_temp) == N_Pragma)
- {
- struct attrib *attr;
- tree gnu_arg0 = 0, gnu_arg1 = 0;
- Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
- enum attr_type etype;
-
- if (Present (gnat_assoc) && Present (First (gnat_assoc))
- && Present (Next (First (gnat_assoc)))
- && (Nkind (Expression (Next (First (gnat_assoc))))
- == N_String_Literal))
- {
- gnu_arg0 = get_identifier (TREE_STRING_POINTER
- (gnat_to_gnu
- (Expression (Next
- (First (gnat_assoc))))));
- if (Present (Next (Next (First (gnat_assoc))))
- && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
- == N_String_Literal))
- gnu_arg1 = get_identifier (TREE_STRING_POINTER
- (gnat_to_gnu
- (Expression
- (Next (Next
- (First (gnat_assoc)))))));
- }
-
- switch (Get_Pragma_Id (Chars (gnat_temp)))
- {
- case Pragma_Machine_Attribute:
- etype = ATTR_MACHINE_ATTRIBUTE;
- break;
-
- case Pragma_Linker_Alias:
- etype = ATTR_LINK_ALIAS;
- break;
-
- case Pragma_Linker_Section:
- etype = ATTR_LINK_SECTION;
- break;
-
- case Pragma_Weak_External:
- etype = ATTR_WEAK_EXTERNAL;
- break;
-
- default:
- continue;
- }
-
- attr = (struct attrib *) xmalloc (sizeof (struct attrib));
- attr->next = attr_list;
- attr->type = etype;
- attr->name = gnu_arg0;
- attr->arg = gnu_arg1;
- attr->error_point
- = Present (Next (First (gnat_assoc)))
- ? Expression (Next (First (gnat_assoc))) : gnat_temp;
- attr_list = attr;
- }
-
- return attr_list;
-}
-\f
-/* Get the unpadded version of a GNAT type. */
-
-tree
-get_unpadded_type (gnat_entity)
- Entity_Id gnat_entity;
-{
- tree type = gnat_to_gnu_type (gnat_entity);
-
- if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
- type = TREE_TYPE (TYPE_FIELDS (type));
-
- return type;
-}
-\f
-/* Called when we need to protect a variable object using a save_expr. */
-
-tree
-maybe_variable (gnu_operand, gnat_node)
- tree gnu_operand;
- Node_Id gnat_node;
-{
- if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
- || TREE_CODE (gnu_operand) == SAVE_EXPR
- || TREE_CODE (gnu_operand) == NULL_EXPR)
- return gnu_operand;
-
- /* If we will be generating code, make sure we are at the proper
- line number. */
- if (! global_bindings_p () && ! TREE_CONSTANT (gnu_operand)
- && ! contains_placeholder_p (gnu_operand))
- set_lineno (gnat_node, 1);
-
- if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
- return build1 (UNCONSTRAINED_ARRAY_REF, TREE_TYPE (gnu_operand),
- variable_size (TREE_OPERAND (gnu_operand, 0)));
- else
- return variable_size (gnu_operand);
-}
-\f
-/* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
- type definition (either a bound or a discriminant value) for GNAT_ENTITY,
- return the GCC tree to use for that expression. GNU_NAME is the
- qualification to use if an external name is appropriate and DEFINITION is
- nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero,
- we need a result. Otherwise, we are just elaborating this for
- side-effects. If NEED_DEBUG is nonzero we need the symbol for debugging
- purposes even if it isn't needed for code generation. */
-
-static tree
-elaborate_expression (gnat_expr, gnat_entity, gnu_name, definition,
- need_value, need_debug)
- Node_Id gnat_expr;
- Entity_Id gnat_entity;
- tree gnu_name;
- int definition;
- int need_value;
- int need_debug;
-{
- tree gnu_expr;
-
- /* If we already elaborated this expression (e.g., it was involved
- in the definition of a private type), use the old value. */
- if (present_gnu_tree (gnat_expr))
- return get_gnu_tree (gnat_expr);
-
- /* If we don't need a value and this is static or a discriment, we
- don't need to do anything. */
- else if (! need_value
- && (Is_OK_Static_Expression (gnat_expr)
- || (Nkind (gnat_expr) == N_Identifier
- && Ekind (Entity (gnat_expr)) == E_Discriminant)))
- return 0;
-
- /* Otherwise, convert this tree to its GCC equivalant. */
- gnu_expr
- = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
- gnu_name, definition, need_debug);
-
- /* Save the expression in case we try to elaborate this entity again.
- Since this is not a DECL, don't check it. If this is a constant,
- don't save it since GNAT_EXPR might be used more than once. Also,
- don't save if it's a discriminant. */
- if (! TREE_CONSTANT (gnu_expr) && ! contains_placeholder_p (gnu_expr))
- save_gnu_tree (gnat_expr, gnu_expr, 1);
-
- return need_value ? gnu_expr : error_mark_node;
-}
-
-/* Similar, but take a GNU expression. */
-
-static tree
-elaborate_expression_1 (gnat_expr, gnat_entity, gnu_expr, gnu_name, definition,
- need_debug)
- Node_Id gnat_expr;
- Entity_Id gnat_entity;
- tree gnu_expr;
- tree gnu_name;
- int definition;
- int need_debug;
-{
- tree gnu_decl = 0;
- tree gnu_inner_expr = gnu_expr;
- int expr_variable;
- int expr_global = Is_Public (gnat_entity) || global_bindings_p ();
-
- /* Strip any conversions to see if the expression is a readonly variable.
- ??? This really should remain readonly, but we have to think about
- the typing of the tree here. */
- while (TREE_CODE (gnu_inner_expr) == NOP_EXPR
- && TREE_CODE (gnu_inner_expr) == CONVERT_EXPR)
- gnu_inner_expr = TREE_OPERAND (gnu_inner_expr, 0);
-
- /* In most cases, we won't see a naked FIELD_DECL here because a
- discriminant reference will have been replaced with a COMPONENT_REF
- when the type is being elaborated. However, there are some cases
- involving child types where we will. So convert it to a COMPONENT_REF
- here. We have to hope it will be at the highest level of the
- expression in these cases. */
- if (TREE_CODE (gnu_expr) == FIELD_DECL)
- gnu_expr = build (COMPONENT_REF, TREE_TYPE (gnu_expr),
- build (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
- gnu_expr);
-
- /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
- that is a constant, make a variable that is initialized to contain the
- bound when the package containing the definition is elaborated. If
- this entity is defined at top level and a bound or discriminant value
- isn't a constant or a reference to a discriminant, replace the bound
- by the variable; otherwise use a SAVE_EXPR if needed. Note that we
- rely here on the fact that an expression cannot contain both the
- discriminant and some other variable. */
-
- expr_variable = (TREE_CODE_CLASS (TREE_CODE (gnu_expr)) != 'c'
- && ! (TREE_CODE (gnu_inner_expr) == VAR_DECL
- && TREE_READONLY (gnu_inner_expr))
- && ! contains_placeholder_p (gnu_expr));
-
- /* If this is a static expression or contains a discriminant, we don't
- need the variable for debugging (and can't elaborate anyway if a
- discriminant). */
- if (need_debug
- && (Is_OK_Static_Expression (gnat_expr)
- || contains_placeholder_p (gnu_expr)))
- need_debug = 0;
-
- /* Now create the variable if we need it. */
- if (need_debug || (expr_variable && expr_global))
- {
- set_lineno (gnat_entity, ! global_bindings_p ());
- gnu_decl
- = create_var_decl (create_concat_name (gnat_entity,
- IDENTIFIER_POINTER (gnu_name)),
- NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, 1,
- Is_Public (gnat_entity), ! definition, 0, 0);
- }
-
- /* We only need to use this variable if we are in global context since GCC
- can do the right thing in the local case. */
- if (expr_global && expr_variable)
- return gnu_decl;
- else
- return maybe_variable (gnu_expr, gnat_expr);
-}
-\f
-/* Create a record type that contains a field of TYPE with a starting bit
- position so that it is aligned to ALIGN bits and is SIZE bytes long. */
-
-tree
-make_aligning_type (type, align, size)
- tree type;
- int align;
- tree size;
-{
- tree record_type = make_node (RECORD_TYPE);
- tree place = build (PLACEHOLDER_EXPR, record_type);
- tree size_addr_place = convert (sizetype,
- build_unary_op (ADDR_EXPR, NULL_TREE,
- place));
- tree name = TYPE_NAME (type);
- tree pos, field;
-
- if (TREE_CODE (name) == TYPE_DECL)
- name = DECL_NAME (name);
-
- TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN");
-
- /* The bit position is obtained by "and"ing the alignment minus 1
- with the two's complement of the address and multiplying
- by the number of bits per unit. Do all this in sizetype. */
-
- pos = size_binop (MULT_EXPR,
- convert (bitsizetype,
- size_binop (BIT_AND_EXPR,
- size_diffop (size_zero_node,
- size_addr_place),
- ssize_int ((align / BITS_PER_UNIT)
- - 1))),
- bitsize_unit_node);
-
- field = create_field_decl (get_identifier ("F"), type, record_type,
- 1, size, pos, 1);
- DECL_BIT_FIELD (field) = 0;
-
- finish_record_type (record_type, field, 1, 0);
- TYPE_ALIGN (record_type) = BIGGEST_ALIGNMENT;
- TYPE_SIZE (record_type)
- = size_binop (PLUS_EXPR,
- size_binop (MULT_EXPR, convert (bitsizetype, size),
- bitsize_unit_node),
- bitsize_int (align));
- TYPE_SIZE_UNIT (record_type)
- = size_binop (PLUS_EXPR, size, size_int (align / BITS_PER_UNIT));
-
- return record_type;
-}
-\f
-/* TYPE is a RECORD_TYPE with BLKmode that's being used as the field
- type of a packed record. See if we can rewrite it as a record that has
- a non-BLKmode type, which we can pack tighter. If so, return the
- new type. If not, return the original type. */
-
-static tree
-make_packable_type (type)
- tree type;
-{
- tree new_type = make_node (RECORD_TYPE);
- tree field_list = NULL_TREE;
- tree old_field;
-
- /* Copy the name and flags from the old type to that of the new and set
- the alignment to try for an integral type. */
- TYPE_NAME (new_type) = TYPE_NAME (type);
- TYPE_LEFT_JUSTIFIED_MODULAR_P (new_type)
- = TYPE_LEFT_JUSTIFIED_MODULAR_P (type);
- TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
-
- TYPE_ALIGN (new_type)
- = ((HOST_WIDE_INT) 1
- << (floor_log2 (tree_low_cst (TYPE_SIZE (type), 1) - 1) + 1));
-
- /* Now copy the fields, keeping the position and size. */
- for (old_field = TYPE_FIELDS (type); old_field != 0;
- old_field = TREE_CHAIN (old_field))
- {
- tree new_field
- = create_field_decl (DECL_NAME (old_field), TREE_TYPE (old_field),
- new_type, TYPE_PACKED (type),
- DECL_SIZE (old_field),
- bit_position (old_field),
- ! DECL_NONADDRESSABLE_P (old_field));
-
- DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
- DECL_ORIGINAL_FIELD (new_field)
- = (DECL_ORIGINAL_FIELD (old_field) != 0
- ? DECL_ORIGINAL_FIELD (old_field) : old_field);
- TREE_CHAIN (new_field) = field_list;
- field_list = new_field;
- }
-
- finish_record_type (new_type, nreverse (field_list), 1, 1);
- return TYPE_MODE (new_type) == BLKmode ? type : new_type;
-}
-\f
-/* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
- if needed. We have already verified that SIZE and TYPE are large enough.
-
- GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
- to issue a warning.
-
- IS_USER_TYPE is nonzero if we must be sure we complete the original type.
-
- DEFINITION is nonzero if this type is being defined.
-
- SAME_RM_SIZE is nonzero if the RM_Size of the resulting type is to be
- set to its TYPE_SIZE; otherwise, it's set to the RM_Size of the original
- type. */
-
-static tree
-maybe_pad_type (type, size, align, gnat_entity, name_trailer,
- is_user_type, definition, same_rm_size)
- tree type;
- tree size;
- unsigned int align;
- Entity_Id gnat_entity;
- const char *name_trailer;
- int is_user_type;
- int definition;
- int same_rm_size;
-{
- tree orig_size = TYPE_SIZE (type);
- tree record;
- tree field;
-
- /* If TYPE is a padded type, see if it agrees with any size and alignment
- we were given. If so, return the original type. Otherwise, strip
- off the padding, since we will either be returning the inner type
- or repadding it. If no size or alignment is specified, use that of
- the original padded type. */
-
- if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
- {
- if ((size == 0
- || operand_equal_p (round_up (size,
- MAX (align, TYPE_ALIGN (type))),
- round_up (TYPE_SIZE (type),
- MAX (align, TYPE_ALIGN (type))),
- 0))
- && (align == 0 || align == TYPE_ALIGN (type)))
- return type;
-
- if (size == 0)
- size = TYPE_SIZE (type);
- if (align == 0)
- align = TYPE_ALIGN (type);
-
- type = TREE_TYPE (TYPE_FIELDS (type));
- orig_size = TYPE_SIZE (type);
- }
-
- /* If the size is either not being changed or is being made smaller (which
- is not done here (and is only valid for bitfields anyway), show the size
- isn't changing. Likewise, clear the alignment if it isn't being
- changed. Then return if we aren't doing anything. */
-
- if (size != 0
- && (operand_equal_p (size, orig_size, 0)
- || (TREE_CODE (orig_size) == INTEGER_CST
- && tree_int_cst_lt (size, orig_size))))
- size = 0;
-
- if (align == TYPE_ALIGN (type))
- align = 0;
-
- if (align == 0 && size == 0)
- return type;
-
- /* We used to modify the record in place in some cases, but that could
- generate incorrect debugging information. So make a new record
- type and name. */
- record = make_node (RECORD_TYPE);
-
- if (Present (gnat_entity))
- TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
-
- /* If we were making a type, complete the original type and give it a
- name. */
- if (is_user_type)
- create_type_decl (get_entity_name (gnat_entity), type,
- 0, ! Comes_From_Source (gnat_entity),
- ! (TYPE_NAME (type) != 0
- && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
- && DECL_IGNORED_P (TYPE_NAME (type))));
-
- /* If we are changing the alignment and the input type is a record with
- BLKmode and a small constant size, try to make a form that has an
- integral mode. That might allow this record to have an integral mode,
- which will be much more efficient. There is no point in doing this if a
- size is specified unless it is also smaller than the biggest alignment
- and it is incorrect to do this if the size of the original type is not a
- multiple of the alignment. */
- if (align != 0
- && TREE_CODE (type) == RECORD_TYPE
- && TYPE_MODE (type) == BLKmode
- && host_integerp (orig_size, 1)
- && compare_tree_int (orig_size, BIGGEST_ALIGNMENT) <= 0
- && (size == 0
- || (TREE_CODE (size) == INTEGER_CST
- && compare_tree_int (size, BIGGEST_ALIGNMENT) <= 0))
- && tree_low_cst (orig_size, 1) % align == 0)
- type = make_packable_type (type);
-
- field = create_field_decl (get_identifier ("F"), type, record, 0,
- NULL_TREE, bitsize_zero_node, 1);
-
- DECL_INTERNAL_P (field) = 1;
- TYPE_SIZE (record) = size != 0 ? size : orig_size;
- TYPE_SIZE_UNIT (record)
- = convert (sizetype,
- size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
- bitsize_unit_node));
- TYPE_ALIGN (record) = align;
- TYPE_IS_PADDING_P (record) = 1;
- TYPE_VOLATILE (record)
- = Present (gnat_entity) && Is_Volatile (gnat_entity);
- finish_record_type (record, field, 1, 0);
-
- /* Keep the RM_Size of the padded record as that of the old record
- if requested. */
- TYPE_ADA_SIZE (record) = same_rm_size ? size : rm_size (type);
-
- /* Unless debugging information isn't being written for the input type,
- write a record that shows what we are a subtype of and also make a
- variable that indicates our size, if variable. */
- if (TYPE_NAME (record) != 0
- && AGGREGATE_TYPE_P (type)
- && (TREE_CODE (TYPE_NAME (type)) != TYPE_DECL
- || ! DECL_IGNORED_P (TYPE_NAME (type))))
- {
- tree marker = make_node (RECORD_TYPE);
- tree name = DECL_NAME (TYPE_NAME (record));
- tree orig_name = TYPE_NAME (type);
-
- if (TREE_CODE (orig_name) == TYPE_DECL)
- orig_name = DECL_NAME (orig_name);
-
- TYPE_NAME (marker) = concat_id_with_name (name, "XVS");
- finish_record_type (marker,
- create_field_decl (orig_name, integer_type_node,
- marker, 0, NULL_TREE, NULL_TREE,
- 0),
- 0, 0);
-
- if (size != 0 && TREE_CODE (size) != INTEGER_CST && definition)
- create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE,
- sizetype, TYPE_SIZE (record), 0, 0, 0, 0,
- 0);
- }
-
- type = record;
-
- if (TREE_CODE (orig_size) != INTEGER_CST
- && contains_placeholder_p (orig_size))
- orig_size = max_size (orig_size, 1);
-
- /* If the size was widened explicitly, maybe give a warning. */
- if (size != 0 && Present (gnat_entity)
- && ! operand_equal_p (size, orig_size, 0)
- && ! (TREE_CODE (size) == INTEGER_CST
- && TREE_CODE (orig_size) == INTEGER_CST
- && tree_int_cst_lt (size, orig_size)))
- {
- Node_Id gnat_error_node = Empty;
-
- if (Is_Packed_Array_Type (gnat_entity))
- gnat_entity = Associated_Node_For_Itype (gnat_entity);
-
- if ((Ekind (gnat_entity) == E_Component
- || Ekind (gnat_entity) == E_Discriminant)
- && Present (Component_Clause (gnat_entity)))
- gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
- else if (Present (Size_Clause (gnat_entity)))
- gnat_error_node = Expression (Size_Clause (gnat_entity));
-
- /* Generate message only for entities that come from source, since
- if we have an entity created by expansion, the message will be
- generated for some other corresponding source entity. */
- if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
- post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
- gnat_entity,
- size_diffop (size, orig_size));
-
- else if (*name_trailer == 'C' && ! Is_Internal (gnat_entity))
- post_error_ne_tree ("component of& padded{ by ^ bits}?",
- gnat_entity, gnat_entity,
- size_diffop (size, orig_size));
- }
-
- return type;
-}
-\f
-/* Given a GNU tree and a GNAT list of choices, generate an expression to test
- the value passed against the list of choices. */
-
-tree
-choices_to_gnu (operand, choices)
- tree operand;
- Node_Id choices;
-{
- Node_Id choice;
- Node_Id gnat_temp;
- tree result = integer_zero_node;
- tree this_test, low = 0, high = 0, single = 0;
-
- for (choice = First (choices); Present (choice); choice = Next (choice))
- {
- switch (Nkind (choice))
- {
- case N_Range:
- low = gnat_to_gnu (Low_Bound (choice));
- high = gnat_to_gnu (High_Bound (choice));
-
- /* There's no good type to use here, so we might as well use
- integer_type_node. */
- this_test
- = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
- build_binary_op (GE_EXPR, integer_type_node,
- operand, low),
- build_binary_op (LE_EXPR, integer_type_node,
- operand, high));
-
- break;
-
- case N_Subtype_Indication:
- gnat_temp = Range_Expression (Constraint (choice));
- low = gnat_to_gnu (Low_Bound (gnat_temp));
- high = gnat_to_gnu (High_Bound (gnat_temp));
-
- this_test
- = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
- build_binary_op (GE_EXPR, integer_type_node,
- operand, low),
- build_binary_op (LE_EXPR, integer_type_node,
- operand, high));
- break;
-
- case N_Identifier:
- case N_Expanded_Name:
- /* This represents either a subtype range, an enumeration
- literal, or a constant Ekind says which. If an enumeration
- literal or constant, fall through to the next case. */
- if (Ekind (Entity (choice)) != E_Enumeration_Literal
- && Ekind (Entity (choice)) != E_Constant)
- {
- tree type = gnat_to_gnu_type (Entity (choice));
-
- low = TYPE_MIN_VALUE (type);
- high = TYPE_MAX_VALUE (type);
-
- this_test
- = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
- build_binary_op (GE_EXPR, integer_type_node,
- operand, low),
- build_binary_op (LE_EXPR, integer_type_node,
- operand, high));
- break;
- }
- /* ... fall through ... */
- case N_Character_Literal:
- case N_Integer_Literal:
- single = gnat_to_gnu (choice);
- this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
- single);
- break;
-
- case N_Others_Choice:
- this_test = integer_one_node;
- break;
-
- default:
- gigi_abort (114);
- }
-
- result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
- result, this_test);
- }
-
- return result;
-}
-\f
-/* Return a GCC tree for a field corresponding to GNAT_FIELD to be
- placed in GNU_RECORD_TYPE.
-
- PACKED is 1 if the enclosing record is packed and -1 if the enclosing
- record has a Component_Alignment of Storage_Unit.
-
- DEFINITION is nonzero if this field is for a record being defined. */
-
-static tree
-gnat_to_gnu_field (gnat_field, gnu_record_type, packed, definition)
- Entity_Id gnat_field;
- tree gnu_record_type;
- int packed;
- int definition;
-{
- tree gnu_field_id = get_entity_name (gnat_field);
- tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
- tree gnu_orig_field_type = gnu_field_type;
- tree gnu_pos = 0;
- tree gnu_size = 0;
- tree gnu_field;
- int needs_strict_alignment
- = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
- || Is_Volatile (gnat_field));
-
- /* If this field requires strict alignment pretend it isn't packed. */
- if (needs_strict_alignment)
- packed = 0;
-
- /* For packed records, this is one of the few occasions on which we use
- the official RM size for discrete or fixed-point components, instead
- of the normal GNAT size stored in Esize. See description in Einfo:
- "Handling of Type'Size Values" for further details. */
-
- if (packed == 1)
- gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
- gnat_field, FIELD_DECL, 0, 1);
-
- if (Known_Static_Esize (gnat_field))
- gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
- gnat_field, FIELD_DECL, 0, 1);
-
- /* If we are packing this record and the field type is also a record
- that's BLKmode and with a small constant size, see if we can get a
- better form of the type that allows more packing. If we can, show
- a size was specified for it if there wasn't one so we know to
- make this a bitfield and avoid making things wider. */
- if (packed && TREE_CODE (gnu_field_type) == RECORD_TYPE
- && TYPE_MODE (gnu_field_type) == BLKmode
- && host_integerp (TYPE_SIZE (gnu_field_type), 1)
- && compare_tree_int (TYPE_SIZE (gnu_field_type), BIGGEST_ALIGNMENT) <= 0)
- {
- gnu_field_type = make_packable_type (gnu_field_type);
-
- if (gnu_field_type != gnu_orig_field_type && gnu_size == 0)
- gnu_size = rm_size (gnu_field_type);
- }
-
- if (Present (Component_Clause (gnat_field)))
- {
- gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
- gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
- gnat_field, FIELD_DECL, 0, 1);
-
- /* Ensure the position does not overlap with the parent subtype,
- if there is one. */
- if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
- {
- tree gnu_parent
- = gnat_to_gnu_type (Parent_Subtype
- (Underlying_Type (Scope (gnat_field))));
-
- if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
- && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
- {
- post_error_ne_tree
- ("offset of& must be beyond parent{, minimum allowed is ^}",
- First_Bit (Component_Clause (gnat_field)), gnat_field,
- TYPE_SIZE_UNIT (gnu_parent));
- }
- }
-
- /* If this field needs strict alignment, ensure the record is
- sufficiently aligned and that that position and size are
- consistent with the alignment. */
- if (needs_strict_alignment)
- {
- tree gnu_min_size = round_up (rm_size (gnu_field_type),
- TYPE_ALIGN (gnu_field_type));
-
- TYPE_ALIGN (gnu_record_type)
- = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
-
- /* If Atomic, the size must match exactly and if aliased, the size
- must not be less than the rounded size. */
- if ((Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
- && ! operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
- {
- post_error_ne_tree
- ("atomic field& must be natural size of type{ (^)}",
- Last_Bit (Component_Clause (gnat_field)), gnat_field,
- TYPE_SIZE (gnu_field_type));
-
- gnu_size = 0;
- }
-
- else if (Is_Aliased (gnat_field)
- && gnu_size != 0
- && tree_int_cst_lt (gnu_size, gnu_min_size))
- {
- post_error_ne_tree
- ("size of aliased field& too small{, minimum required is ^}",
- Last_Bit (Component_Clause (gnat_field)), gnat_field,
- gnu_min_size);
- gnu_size = 0;
- }
-
- if (! integer_zerop (size_binop
- (TRUNC_MOD_EXPR, gnu_pos,
- bitsize_int (TYPE_ALIGN (gnu_field_type)))))
- {
- if (Is_Aliased (gnat_field))
- post_error_ne_num
- ("position of aliased field& must be multiple of ^ bits",
- Component_Clause (gnat_field), gnat_field,
- TYPE_ALIGN (gnu_field_type));
-
- else if (Is_Volatile (gnat_field))
- post_error_ne_num
- ("position of volatile field& must be multiple of ^ bits",
- First_Bit (Component_Clause (gnat_field)), gnat_field,
- TYPE_ALIGN (gnu_field_type));
-
- else if (Strict_Alignment (Etype (gnat_field)))
- post_error_ne_num
- ("position of & with aliased or tagged components not multiple of ^ bits",
- First_Bit (Component_Clause (gnat_field)), gnat_field,
- TYPE_ALIGN (gnu_field_type));
- else
- gigi_abort (124);
-
- gnu_pos = 0;
- }
-
- /* If an error set the size to zero, show we have no position
- either. */
- if (gnu_size == 0)
- gnu_pos = 0;
- }
-
- if (Is_Atomic (gnat_field))
- check_ok_for_atomic (gnu_field_type, gnat_field, 0);
-
- if (gnu_pos !=0 && TYPE_MODE (gnu_field_type) == BLKmode
- && (! integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_pos,
- bitsize_unit_node))))
- {
- /* Try to see if we can make this a packable type. If we
- can, it's OK. */
- if (TREE_CODE (gnu_field_type) == RECORD_TYPE)
- gnu_field_type = make_packable_type (gnu_field_type);
-
- if (TYPE_MODE (gnu_field_type) == BLKmode)
- {
- post_error_ne ("fields of& must start at storage unit boundary",
- First_Bit (Component_Clause (gnat_field)),
- Etype (gnat_field));
- gnu_pos = 0;
- }
- }
- }
-
- /* If the record has rep clauses and this is the tag field, make a rep
- clause for it as well. */
- else if (Has_Specified_Layout (Scope (gnat_field))
- && Chars (gnat_field) == Name_uTag)
- {
- gnu_pos = bitsize_zero_node;
- gnu_size = TYPE_SIZE (gnu_field_type);
- }
-
- /* We need to make the size the maximum for the type if it is
- self-referential and an unconstrained type. */
- if (TREE_CODE (gnu_field_type) == RECORD_TYPE
- && gnu_size == 0
- && ! TREE_CONSTANT (TYPE_SIZE (gnu_field_type))
- && contains_placeholder_p (TYPE_SIZE (gnu_field_type))
- && ! Is_Constrained (Underlying_Type (Etype (gnat_field))))
- gnu_size = max_size (TYPE_SIZE (gnu_field_type), 1);
-
- /* If no size is specified (or if there was an error), don't specify a
- position. */
- if (gnu_size == 0)
- gnu_pos = 0;
- else
- {
- /* Unless this field is aliased, we can remove any left-justified
- modular type since it's only needed in the unchecked conversion
- case, which doesn't apply here. */
- if (! needs_strict_alignment
- && TREE_CODE (gnu_field_type) == RECORD_TYPE
- && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_field_type))
- gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
-
- gnu_field_type
- = make_type_from_size (gnu_field_type, gnu_size,
- Has_Biased_Representation (gnat_field));
- gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0,
- gnat_field, "PAD", 0, definition, 1);
- }
-
- if (TREE_CODE (gnu_field_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_field_type))
- gigi_abort (118);
-
- set_lineno (gnat_field, 0);
- gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
- packed, gnu_size, gnu_pos,
- Is_Aliased (gnat_field));
-
- TREE_THIS_VOLATILE (gnu_field) = Is_Volatile (gnat_field);
-
- if (Ekind (gnat_field) == E_Discriminant)
- DECL_DISCRIMINANT_NUMBER (gnu_field)
- = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
-
- return gnu_field;
-}
-\f
-/* Return a GCC tree for a record type given a GNAT Component_List and a chain
- of GCC trees for fields that are in the record and have already been
- processed. When called from gnat_to_gnu_entity during the processing of a
- record type definition, the GCC nodes for the discriminants will be on
- the chain. The other calls to this function are recursive calls from
- itself for the Component_List of a variant and the chain is empty.
-
- PACKED is 1 if this is for a record with "pragma pack" and -1 is this is
- for a record type with "pragma component_alignment (storage_unit)".
-
- FINISH_RECORD is nonzero if this call will supply all of the remaining
- fields of the record.
-
- P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
- with a rep clause is to be added. If it is nonzero, that is all that
- should be done with such fields.
-
- CANCEL_ALIGNMENT, if nonzero, means the alignment should be zeroed
- before laying out the record. This means the alignment only serves
- to force fields to be bitfields, but not require the record to be
- that aligned. This is used for variants.
-
- ALL_REP, if nonzero, means that a rep clause was found for all the
- fields. This simplifies the logic since we know we're not in the mixed
- case.
-
- The processing of the component list fills in the chain with all of the
- fields of the record and then the record type is finished. */
-
-static void
-components_to_record (gnu_record_type, component_list, gnu_field_list, packed,
- definition, p_gnu_rep_list, cancel_alignment, all_rep)
- tree gnu_record_type;
- Node_Id component_list;
- tree gnu_field_list;
- int packed;
- int definition;
- tree *p_gnu_rep_list;
- int cancel_alignment;
- int all_rep;
-{
- Node_Id component_decl;
- Entity_Id gnat_field;
- Node_Id variant_part;
- Node_Id variant;
- tree gnu_our_rep_list = NULL_TREE;
- tree gnu_field, gnu_last;
- int layout_with_rep = 0;
-
- /* For each variable within each component declaration create a GCC field
- and add it to the list, skipping any pragmas in the list. */
-
- if (Present (Component_Items (component_list)))
- for (component_decl = First_Non_Pragma (Component_Items (component_list));
- Present (component_decl);
- component_decl = Next_Non_Pragma (component_decl))
- {
- gnat_field = Defining_Entity (component_decl);
-
- if (Chars (gnat_field) == Name_uParent)
- gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
- else
- {
- gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
- packed, definition);
-
- /* If this is the _Tag field, put it before any discriminants,
- instead of after them as is the case for all other fields. */
- if (Chars (gnat_field) == Name_uTag)
- gnu_field_list = chainon (gnu_field_list, gnu_field);
- else
- {
- TREE_CHAIN (gnu_field) = gnu_field_list;
- gnu_field_list = gnu_field;
- }
- }
-
- save_gnu_tree (gnat_field, gnu_field, 0);
- }
-
- /* At the end of the component list there may be a variant part. */
- variant_part = Variant_Part (component_list);
-
- /* If this is an unchecked union, each variant must have exactly one
- component, each of which becomes one component of this union. */
- if (TREE_CODE (gnu_record_type) == UNION_TYPE && Present (variant_part))
- for (variant = First_Non_Pragma (Variants (variant_part));
- Present (variant);
- variant = Next_Non_Pragma (variant))
- {
- component_decl
- = First_Non_Pragma (Component_Items (Component_List (variant)));
- gnat_field = Defining_Entity (component_decl);
- gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
- definition);
- TREE_CHAIN (gnu_field) = gnu_field_list;
- gnu_field_list = gnu_field;
- save_gnu_tree (gnat_field, gnu_field, 0);
- }
-
- /* We create a QUAL_UNION_TYPE for the variant part since the variants are
- mutually exclusive and should go in the same memory. To do this we need
- to treat each variant as a record whose elements are created from the
- component list for the variant. So here we create the records from the
- lists for the variants and put them all into the QUAL_UNION_TYPE. */
- else if (Present (variant_part))
- {
- tree gnu_discriminant = gnat_to_gnu (Name (variant_part));
- Node_Id variant;
- tree gnu_union_type = make_node (QUAL_UNION_TYPE);
- tree gnu_union_field;
- tree gnu_variant_list = NULL_TREE;
- tree gnu_name = TYPE_NAME (gnu_record_type);
- tree gnu_var_name
- = concat_id_with_name
- (get_identifier (Get_Name_String (Chars (Name (variant_part)))),
- "XVN");
-
- if (TREE_CODE (gnu_name) == TYPE_DECL)
- gnu_name = DECL_NAME (gnu_name);
-
- TYPE_NAME (gnu_union_type)
- = concat_id_with_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
- TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
-
- for (variant = First_Non_Pragma (Variants (variant_part));
- Present (variant);
- variant = Next_Non_Pragma (variant))
- {
- tree gnu_variant_type = make_node (RECORD_TYPE);
- tree gnu_inner_name;
- tree gnu_qual;
-
- Get_Variant_Encoding (variant);
- gnu_inner_name = get_identifier (Name_Buffer);
- TYPE_NAME (gnu_variant_type)
- = concat_id_with_name (TYPE_NAME (gnu_union_type),
- IDENTIFIER_POINTER (gnu_inner_name));
-
- /* Set the alignment of the inner type in case we need to make
- inner objects into bitfields, but then clear it out
- so the record actually gets only the alignment required. */
- TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
- TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
- components_to_record (gnu_variant_type, Component_List (variant),
- NULL_TREE, packed, definition,
- &gnu_our_rep_list, 1, all_rep);
-
- gnu_qual = choices_to_gnu (gnu_discriminant,
- Discrete_Choices (variant));
-
- Set_Present_Expr (variant, annotate_value (gnu_qual));
- gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
- gnu_union_type, 0, 0, 0, 1);
- DECL_INTERNAL_P (gnu_field) = 1;
- DECL_QUALIFIER (gnu_field) = gnu_qual;
- TREE_CHAIN (gnu_field) = gnu_variant_list;
- gnu_variant_list = gnu_field;
- }
-
- /* We can delete any empty variants from the end. This may leave none
- left. Note we cannot delete variants from anywhere else. */
- while (gnu_variant_list != 0
- && TYPE_FIELDS (TREE_TYPE (gnu_variant_list)) == 0)
- gnu_variant_list = TREE_CHAIN (gnu_variant_list);
-
- /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
- if (gnu_variant_list != 0)
- {
- finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
- 0, 0);
-
- gnu_union_field
- = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
- packed,
- all_rep ? TYPE_SIZE (gnu_union_type) : 0,
- all_rep ? bitsize_zero_node : 0, 1);
-
- DECL_INTERNAL_P (gnu_union_field) = 1;
- TREE_CHAIN (gnu_union_field) = gnu_field_list;
- gnu_field_list = gnu_union_field;
- }
- }
-
- /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
- do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
- in a separate pass since we want to handle the discriminants but can't
- play with them until we've used them in debugging data above.
-
- ??? Note: if we then reorder them, debugging information will be wrong,
- but there's nothing that can be done about this at the moment. */
-
- for (gnu_field = gnu_field_list, gnu_last = 0; gnu_field; )
- {
- if (DECL_FIELD_OFFSET (gnu_field) != 0)
- {
- tree gnu_next = TREE_CHAIN (gnu_field);
-
- if (gnu_last == 0)
- gnu_field_list = gnu_next;
- else
- TREE_CHAIN (gnu_last) = gnu_next;
-
- TREE_CHAIN (gnu_field) = gnu_our_rep_list;
- gnu_our_rep_list = gnu_field;
- gnu_field = gnu_next;
- }
- else
- {
- gnu_last = gnu_field;
- gnu_field = TREE_CHAIN (gnu_field);
- }
- }
-
- /* If we have any items in our rep'ed field list, it is not the case that all
- the fields in the record have rep clauses, and P_REP_LIST is nonzero,
- set it and ignore the items. Otherwise, sort the fields by bit position
- and put them into their own record if we have any fields without
- rep clauses. */
- if (gnu_our_rep_list != 0 && p_gnu_rep_list != 0 && ! all_rep)
- *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
- else if (gnu_our_rep_list != 0)
- {
- tree gnu_rep_type
- = gnu_field_list == 0 ? gnu_record_type : make_node (RECORD_TYPE);
- int len = list_length (gnu_our_rep_list);
- tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
- int i;
-
- /* Set DECL_SECTION_NAME to increasing integers so we have a
- stable sort. */
- for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
- gnu_field = TREE_CHAIN (gnu_field), i++)
- {
- gnu_arr[i] = gnu_field;
- DECL_SECTION_NAME (gnu_field) = size_int (i);
- }
-
- qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
-
- /* Put the fields in the list in order of increasing position, which
- means we start from the end. */
- gnu_our_rep_list = NULL_TREE;
- for (i = len - 1; i >= 0; i--)
- {
- TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
- gnu_our_rep_list = gnu_arr[i];
- DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
- DECL_SECTION_NAME (gnu_arr[i]) = 0;
- }
-
- if (gnu_field_list != 0)
- {
- finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, 0);
- gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
- gnu_record_type, 0, 0, 0, 1);
- DECL_INTERNAL_P (gnu_field) = 1;
- gnu_field_list = chainon (gnu_field_list, gnu_field);
- }
- else
- {
- layout_with_rep = 1;
- gnu_field_list = nreverse (gnu_our_rep_list);
- }
- }
-
- if (cancel_alignment)
- TYPE_ALIGN (gnu_record_type) = 0;
-
- finish_record_type (gnu_record_type, nreverse (gnu_field_list),
- layout_with_rep, 0);
-}
-\f
-/* Called via qsort from the above. Returns -1, 1, depending on the
- bit positions and ordinals of the two fields. */
-
-static int
-compare_field_bitpos (rt1, rt2)
- const PTR rt1;
- const PTR rt2;
-{
- tree *t1 = (tree *) rt1;
- tree *t2 = (tree *) rt2;
-
- if (tree_int_cst_equal (bit_position (*t1), bit_position (*t2)))
- return
- (tree_int_cst_lt (DECL_SECTION_NAME (*t1), DECL_SECTION_NAME (*t2))
- ? -1 : 1);
- else if (tree_int_cst_lt (bit_position (*t1), bit_position (*t2)))
- return -1;
- else
- return 1;
-}
-\f
-/* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
- placed into an Esize, Component_Bit_Offset, or Component_Size value
- in the GNAT tree. */
-
-static Uint
-annotate_value (gnu_size)
- tree gnu_size;
-{
- int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
- TCode tcode;
- Node_Ref_Or_Val ops[3];
- int i;
- int size;
-
- /* If we do not return inside this switch, TCODE will be set to the
- code to use for a Create_Node operand and LEN (set above) will be
- the number of recursive calls for us to make. */
-
- switch (TREE_CODE (gnu_size))
- {
- case INTEGER_CST:
- if (TREE_OVERFLOW (gnu_size))
- return No_Uint;
-
- /* This may have come from a conversion from some smaller type,
- so ensure this is in bitsizetype. */
- gnu_size = convert (bitsizetype, gnu_size);
-
- /* For negative values, use NEGATE_EXPR of the supplied value. */
- if (tree_int_cst_sgn (gnu_size) < 0)
- {
- /* The rediculous code below is to handle the case of the largest
- negative integer. */
- tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
- int adjust = 0;
- tree temp;
-
- if (TREE_CONSTANT_OVERFLOW (negative_size))
- {
- negative_size
- = size_binop (MINUS_EXPR, bitsize_zero_node,
- size_binop (PLUS_EXPR, gnu_size,
- bitsize_one_node));
- adjust = 1;
- }
-
- temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
- if (adjust)
- temp = build (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
-
- return annotate_value (temp);
- }
-
- if (! host_integerp (gnu_size, 1))
- return No_Uint;
-
- size = tree_low_cst (gnu_size, 1);
-
- /* This peculiar test is to make sure that the size fits in an int
- on machines where HOST_WIDE_INT is not "int". */
- if (tree_low_cst (gnu_size, 1) == size)
- return UI_From_Int (size);
- else
- return No_Uint;
-
- case COMPONENT_REF:
- /* The only case we handle here is a simple discriminant reference. */
- if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
- && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
- && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)) != 0)
- return Create_Node (Discrim_Val,
- annotate_value (DECL_DISCRIMINANT_NUMBER
- (TREE_OPERAND (gnu_size, 1))),
- No_Uint, No_Uint);
- else
- return No_Uint;
-
- case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
- return annotate_value (TREE_OPERAND (gnu_size, 0));
-
- /* Now just list the operations we handle. */
- case COND_EXPR: tcode = Cond_Expr; break;
- case PLUS_EXPR: tcode = Plus_Expr; break;
- case MINUS_EXPR: tcode = Minus_Expr; break;
- case MULT_EXPR: tcode = Mult_Expr; break;
- case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
- case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
- case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
- case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
- case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
- case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
- case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
- case NEGATE_EXPR: tcode = Negate_Expr; break;
- case MIN_EXPR: tcode = Min_Expr; break;
- case MAX_EXPR: tcode = Max_Expr; break;
- case ABS_EXPR: tcode = Abs_Expr; break;
- case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
- case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
- case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
- case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
- case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
- case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
- case LT_EXPR: tcode = Lt_Expr; break;
- case LE_EXPR: tcode = Le_Expr; break;
- case GT_EXPR: tcode = Gt_Expr; break;
- case GE_EXPR: tcode = Ge_Expr; break;
- case EQ_EXPR: tcode = Eq_Expr; break;
- case NE_EXPR: tcode = Ne_Expr; break;
-
- default:
- return No_Uint;
- }
-
- /* Now get each of the operands that's relevant for this code. If any
- cannot be expressed as a repinfo node, say we can't. */
- for (i = 0; i < 3; i++)
- ops[i] = No_Uint;
-
- for (i = 0; i < len; i++)
- {
- ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
- if (ops[i] == No_Uint)
- return No_Uint;
- }
-
- return Create_Node (tcode, ops[0], ops[1], ops[2]);
-}
-
-/* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
- GCC type, set Component_Bit_Offset and Esize to the position and size
- used by Gigi. */
-
-static void
-annotate_rep (gnat_entity, gnu_type)
- Entity_Id gnat_entity;
- tree gnu_type;
-{
- tree gnu_list;
- tree gnu_entry;
- Entity_Id gnat_field;
-
- /* We operate by first making a list of all field and their positions
- (we can get the sizes easily at any time) by a recursive call
- and then update all the sizes into the tree. */
- gnu_list = compute_field_positions (gnu_type, NULL_TREE,
- size_zero_node, bitsize_zero_node);
-
- for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
- gnat_field = Next_Entity (gnat_field))
- if ((Ekind (gnat_field) == E_Component
- || (Ekind (gnat_field) == E_Discriminant
- && ! Is_Unchecked_Union (Scope (gnat_field))))
- && 0 != (gnu_entry = purpose_member (gnat_to_gnu_entity (gnat_field,
- NULL_TREE, 0),
- gnu_list)))
- {
- Set_Component_Bit_Offset
- (gnat_field,
- annotate_value (bit_from_pos
- (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
- TREE_VALUE (TREE_VALUE (gnu_entry)))));
-
- Set_Esize (gnat_field,
- annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
- }
-}
-
-/* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is
- the FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the
- byte position and TREE_VALUE being the bit position. GNU_POS is to
- be added to the position, GNU_BITPOS to the bit position, and GNU_LIST
- is the entries so far. */
-
-static tree
-compute_field_positions (gnu_type, gnu_list, gnu_pos, gnu_bitpos)
- tree gnu_type;
- tree gnu_list;
- tree gnu_pos;
- tree gnu_bitpos;
-{
- tree gnu_field;
- tree gnu_result = gnu_list;
-
- for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
- gnu_field = TREE_CHAIN (gnu_field))
- {
- tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
- DECL_FIELD_BIT_OFFSET (gnu_field));
- tree gnu_our_pos = size_binop (PLUS_EXPR, gnu_pos,
- DECL_FIELD_OFFSET (gnu_field));
-
- gnu_result
- = tree_cons (gnu_field,
- tree_cons (gnu_our_pos, gnu_our_bitpos, NULL_TREE),
- gnu_result);
-
- if (DECL_INTERNAL_P (gnu_field))
- gnu_result
- = compute_field_positions (TREE_TYPE (gnu_field),
- gnu_result, gnu_our_pos, gnu_our_bitpos);
- }
-
- return gnu_result;
-}
-\f
-/* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
- corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
- to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
- the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
- for the size of a field. COMPONENT_P is true if we are being called
- to process the Component_Size of GNAT_OBJECT. This is used for error
- message handling and to indicate to use the object size of GNU_TYPE.
- ZERO_OK is nonzero if a size of zero is permitted; if ZERO_OK is zero,
- it means that a size of zero should be treated as an unspecified size. */
-
-static tree
-validate_size (uint_size, gnu_type, gnat_object, kind, component_p, zero_ok)
- Uint uint_size;
- tree gnu_type;
- Entity_Id gnat_object;
- enum tree_code kind;
- int component_p;
- int zero_ok;
-{
- Node_Id gnat_error_node;
- tree type_size
- = kind == VAR_DECL ? TYPE_SIZE (gnu_type) : rm_size (gnu_type);
- tree size;
-
- if (type_size != 0 && TREE_CODE (type_size) != INTEGER_CST
- && contains_placeholder_p (type_size))
- type_size = max_size (type_size, 1);
-
- if (TYPE_FAT_POINTER_P (gnu_type))
- type_size = bitsize_int (POINTER_SIZE);
-
- if ((Ekind (gnat_object) == E_Component
- || Ekind (gnat_object) == E_Discriminant)
- && Present (Component_Clause (gnat_object)))
- gnat_error_node = Last_Bit (Component_Clause (gnat_object));
- else if (Present (Size_Clause (gnat_object)))
- gnat_error_node = Expression (Size_Clause (gnat_object));
- else
- gnat_error_node = gnat_object;
-
- /* Don't give errors on packed array types; we'll be giving the error on
- the type itself soon enough. */
- if (Is_Packed_Array_Type (gnat_object))
- gnat_error_node = Empty;
-
- /* Get the size as a tree. Return 0 if none was specified, either because
- Esize was not Present or if the specified size was zero. Give an error
- if a size was specified, but cannot be represented as in sizetype. If
- the size is negative, it was a back-annotation of a variable size and
- should be treated as not specified. */
- if (No (uint_size) || uint_size == No_Uint)
- return 0;
-
- size = UI_To_gnu (uint_size, bitsizetype);
- if (TREE_OVERFLOW (size))
- {
- if (component_p)
- post_error_ne ("component size of & is too large",
- gnat_error_node, gnat_object);
- else
- post_error_ne ("size of & is too large", gnat_error_node, gnat_object);
-
- return 0;
- }
-
- /* Ignore a negative size since that corresponds to our back-annotation.
- Also ignore a zero size unless a size clause exists. */
- else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && ! zero_ok))
- return 0;
-
- /* The size of objects is always a multiple of a byte. */
- if (kind == VAR_DECL
- && ! integer_zerop (size_binop (TRUNC_MOD_EXPR, size,
- bitsize_unit_node)))
- {
- if (component_p)
- post_error_ne ("component size for& is not a multiple of Storage_Unit",
- gnat_error_node, gnat_object);
- else
- post_error_ne ("size for& is not a multiple of Storage_Unit",
- gnat_error_node, gnat_object);
- return 0;
- }
-
- /* If this is an integral type, the front-end has verified the size, so we
- need not do it here (which would entail checking against the bounds).
- However, if this is an aliased object, it may not be smaller than the
- type of the object. */
- if (INTEGRAL_TYPE_P (gnu_type) && ! TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
- && ! (kind == VAR_DECL && Is_Aliased (gnat_object)))
- return size;
-
- /* If the object is a record that contains a template, add the size of
- the template to the specified size. */
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
- size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
-
- /* If the size of the object is a constant, the new size must not be
- smaller. */
- if (TREE_CODE (type_size) != INTEGER_CST
- || TREE_OVERFLOW (type_size)
- || tree_int_cst_lt (size, type_size))
- {
- if (component_p)
- post_error_ne_tree
- ("component size for& too small{, minimum allowed is ^}",
- gnat_error_node, gnat_object, type_size);
- else
- post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
- gnat_error_node, gnat_object, type_size);
-
- if (kind == VAR_DECL && ! component_p
- && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
- && ! tree_int_cst_lt (size, rm_size (gnu_type)))
- post_error_ne_tree_2
- ("\\size of ^ is not a multiple of alignment (^ bits)",
- gnat_error_node, gnat_object, rm_size (gnu_type),
- TYPE_ALIGN (gnu_type));
-
- else if (INTEGRAL_TYPE_P (gnu_type))
- post_error_ne ("\\size would be legal if & were not aliased!",
- gnat_error_node, gnat_object);
-
- return 0;
- }
-
- return size;
-}
-\f
-/* Similarly, but both validate and process a value of RM_Size. This
- routine is only called for types. */
-
-static void
-set_rm_size (uint_size, gnu_type, gnat_entity)
- Uint uint_size;
- tree gnu_type;
- Entity_Id gnat_entity;
-{
- /* Only give an error if a Value_Size clause was explicitly given.
- Otherwise, we'd be duplicating an error on the Size clause. */
- Node_Id gnat_attr_node
- = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
- tree old_size = rm_size (gnu_type);
- tree size;
-
- /* Get the size as a tree. Do nothing if none was specified, either
- because RM_Size was not Present or if the specified size was zero.
- Give an error if a size was specified, but cannot be represented as
- in sizetype. */
- if (No (uint_size) || uint_size == No_Uint)
- return;
-
- size = UI_To_gnu (uint_size, bitsizetype);
- if (TREE_OVERFLOW (size))
- {
- if (Present (gnat_attr_node))
- post_error_ne ("Value_Size of & is too large", gnat_attr_node,
- gnat_entity);
-
- return;
- }
-
- /* Ignore a negative size since that corresponds to our back-annotation.
- Also ignore a zero size unless a size clause exists, a Value_Size
- clause exists, or this is an integer type, in which case the
- front end will have always set it. */
- else if (tree_int_cst_sgn (size) < 0
- || (integer_zerop (size) && No (gnat_attr_node)
- && ! Has_Size_Clause (gnat_entity)
- && ! Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
- return;
-
- /* If the old size is self-referential, get the maximum size. */
- if (TREE_CODE (old_size) != INTEGER_CST
- && contains_placeholder_p (old_size))
- old_size = max_size (old_size, 1);
-
- /* If the size of the object is a constant, the new size must not be
- smaller (the front end checks this for scalar types). */
- if (TREE_CODE (old_size) != INTEGER_CST
- || TREE_OVERFLOW (old_size)
- || (AGGREGATE_TYPE_P (gnu_type)
- && tree_int_cst_lt (size, old_size)))
- {
- if (Present (gnat_attr_node))
- post_error_ne_tree
- ("Value_Size for& too small{, minimum allowed is ^}",
- gnat_attr_node, gnat_entity, old_size);
-
- return;
- }
-
- /* Otherwise, set the RM_Size. */
- if (TREE_CODE (gnu_type) == INTEGER_TYPE
- && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
- TYPE_RM_SIZE_INT (gnu_type) = size;
- else if (TREE_CODE (gnu_type) == ENUMERAL_TYPE)
- TYPE_RM_SIZE_ENUM (gnu_type) = size;
- else if ((TREE_CODE (gnu_type) == RECORD_TYPE
- || TREE_CODE (gnu_type) == UNION_TYPE
- || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
- && ! TYPE_IS_FAT_POINTER_P (gnu_type))
- TYPE_ADA_SIZE (gnu_type) = size;
-}
-\f
-/* Given a type TYPE, return a new type whose size is appropriate for SIZE.
- If TYPE is the best type, return it. Otherwise, make a new type. We
- only support new integral and pointer types. BIASED_P is nonzero if
- we are making a biased type. */
-
-static tree
-make_type_from_size (type, size_tree, biased_p)
- tree type;
- tree size_tree;
- int biased_p;
-{
- tree new_type;
- unsigned HOST_WIDE_INT size;
-
- /* If size indicates an error, just return TYPE to avoid propagating the
- error. Likewise if it's too large to represent. */
- if (size_tree == 0 || ! host_integerp (size_tree, 1))
- return type;
-
- size = tree_low_cst (size_tree, 1);
- switch (TREE_CODE (type))
- {
- case INTEGER_TYPE:
- case ENUMERAL_TYPE:
- /* Only do something if the type is not already the proper size and is
- not a packed array type. */
- if (TYPE_PACKED_ARRAY_TYPE_P (type)
- || (TYPE_PRECISION (type) == size
- && biased_p == (TREE_CODE (type) == INTEGER_CST
- && TYPE_BIASED_REPRESENTATION_P (type))))
- break;
-
- size = MIN (size, LONG_LONG_TYPE_SIZE);
- new_type = make_signed_type (size);
- TREE_TYPE (new_type)
- = TREE_TYPE (type) != 0 ? TREE_TYPE (type) : type;
- TYPE_MIN_VALUE (new_type)
- = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
- TYPE_MAX_VALUE (new_type)
- = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
- TYPE_BIASED_REPRESENTATION_P (new_type)
- = ((TREE_CODE (type) == INTEGER_TYPE
- && TYPE_BIASED_REPRESENTATION_P (type))
- || biased_p);
- TREE_UNSIGNED (new_type)
- = TREE_UNSIGNED (type) | TYPE_BIASED_REPRESENTATION_P (new_type);
- TYPE_RM_SIZE_INT (new_type) = bitsize_int (size);
- return new_type;
-
- case RECORD_TYPE:
- /* Do something if this is a fat pointer, in which case we
- may need to return the thin pointer. */
- if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
- return
- build_pointer_type
- (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)));
- break;
-
- case POINTER_TYPE:
- /* Only do something if this is a thin pointer, in which case we
- may need to return the fat pointer. */
- if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
- return
- build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
-
- break;
-
- default:
- break;
- }
-
- return type;
-}
-\f
-/* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
- a type or object whose present alignment is ALIGN. If this alignment is
- valid, return it. Otherwise, give an error and return ALIGN. */
-
-static unsigned int
-validate_alignment (alignment, gnat_entity, align)
- Uint alignment;
- Entity_Id gnat_entity;
- unsigned int align;
-{
- Node_Id gnat_error_node = gnat_entity;
- unsigned int new_align;
-
-#ifndef MAX_OFILE_ALIGNMENT
-#define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
-#endif
-
- if (Present (Alignment_Clause (gnat_entity)))
- gnat_error_node = Expression (Alignment_Clause (gnat_entity));
-
- /* Within GCC, an alignment is an integer, so we must make sure a
- value is specified that fits in that range. Also, alignments of
- more than MAX_OFILE_ALIGNMENT can't be supported. */
-
- if (! UI_Is_In_Int_Range (alignment)
- || ((new_align = UI_To_Int (alignment))
- > MAX_OFILE_ALIGNMENT / BITS_PER_UNIT))
- post_error_ne_num ("largest supported alignment for& is ^",
- gnat_error_node, gnat_entity,
- MAX_OFILE_ALIGNMENT / BITS_PER_UNIT);
- else if (! (Present (Alignment_Clause (gnat_entity))
- && From_At_Mod (Alignment_Clause (gnat_entity)))
- && new_align * BITS_PER_UNIT < align)
- post_error_ne_num ("alignment for& must be at least ^",
- gnat_error_node, gnat_entity,
- align / BITS_PER_UNIT);
- else
- align = MAX (align, new_align == 0 ? 1 : new_align * BITS_PER_UNIT);
-
- return align;
-}
-\f
-/* Verify that OBJECT, a type or decl, is something we can implement
- atomically. If not, give an error for GNAT_ENTITY. COMP_P is nonzero
- if we require atomic components. */
-
-static void
-check_ok_for_atomic (object, gnat_entity, comp_p)
- tree object;
- Entity_Id gnat_entity;
- int comp_p;
-{
- Node_Id gnat_error_point = gnat_entity;
- Node_Id gnat_node;
- enum machine_mode mode;
- unsigned int align;
- tree size;
-
- /* There are three case of what OBJECT can be. It can be a type, in which
- case we take the size, alignment and mode from the type. It can be a
- declaration that was indirect, in which case the relevant values are
- that of the type being pointed to, or it can be a normal declaration,
- in which case the values are of the decl. The code below assumes that
- OBJECT is either a type or a decl. */
- if (TYPE_P (object))
- {
- mode = TYPE_MODE (object);
- align = TYPE_ALIGN (object);
- size = TYPE_SIZE (object);
- }
- else if (DECL_BY_REF_P (object))
- {
- mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
- align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
- size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
- }
- else
- {
- mode = DECL_MODE (object);
- align = DECL_ALIGN (object);
- size = DECL_SIZE (object);
- }
-
- /* Consider all floating-point types atomic and any types that that are
- represented by integers no wider than a machine word. */
- if (GET_MODE_CLASS (mode) == MODE_FLOAT
- || ((GET_MODE_CLASS (mode) == MODE_INT
- || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
- && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
- return;
-
- /* For the moment, also allow anything that has an alignment equal
- to its size and which is smaller than a word. */
- if (TREE_CODE (size) == INTEGER_CST
- && compare_tree_int (size, align) == 0
- && align <= BITS_PER_WORD)
- return;
-
- for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
- gnat_node = Next_Rep_Item (gnat_node))
- {
- if (! comp_p && Nkind (gnat_node) == N_Pragma
- && Get_Pragma_Id (Chars (gnat_node)) == Pragma_Atomic)
- gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
- else if (comp_p && Nkind (gnat_node) == N_Pragma
- && (Get_Pragma_Id (Chars (gnat_node))
- == Pragma_Atomic_Components))
- gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
- }
-
- if (comp_p)
- post_error_ne ("atomic access to component of & cannot be guaranteed",
- gnat_error_point, gnat_entity);
- else
- post_error_ne ("atomic access to & cannot be guaranteed",
- gnat_error_point, gnat_entity);
-}
-\f
-/* Given a type T, a FIELD_DECL F, and a replacement value R,
- return a new type with all size expressions that contain F
- updated by replacing F with R. This is identical to GCC's
- substitute_in_type except that it knows about TYPE_INDEX_TYPE.
- If F is NULL_TREE, always make a new RECORD_TYPE, even if nothing has
- changed. */
-
-tree
-gnat_substitute_in_type (t, f, r)
- tree t, f, r;
-{
- tree new = t;
- tree tem;
-
- switch (TREE_CODE (t))
- {
- case INTEGER_TYPE:
- case ENUMERAL_TYPE:
- case BOOLEAN_TYPE:
- case CHAR_TYPE:
- if ((TREE_CODE (TYPE_MIN_VALUE (t)) != INTEGER_CST
- && contains_placeholder_p (TYPE_MIN_VALUE (t)))
- || (TREE_CODE (TYPE_MAX_VALUE (t)) != INTEGER_CST
- && contains_placeholder_p (TYPE_MAX_VALUE (t))))
- {
- tree low = substitute_in_expr (TYPE_MIN_VALUE (t), f, r);
- tree high = substitute_in_expr (TYPE_MAX_VALUE (t), f, r);
-
- if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
- return t;
-
- new = build_range_type (TREE_TYPE (t), low, high);
- if (TYPE_INDEX_TYPE (t))
- TYPE_INDEX_TYPE (new)
- = gnat_substitute_in_type (TYPE_INDEX_TYPE (t), f, r);
- return new;
- }
-
- return t;
-
- case REAL_TYPE:
- if ((TYPE_MIN_VALUE (t) != 0
- && TREE_CODE (TYPE_MIN_VALUE (t)) != REAL_CST
- && contains_placeholder_p (TYPE_MIN_VALUE (t)))
- || (TYPE_MAX_VALUE (t) != 0
- && TREE_CODE (TYPE_MAX_VALUE (t)) != REAL_CST
- && contains_placeholder_p (TYPE_MAX_VALUE (t))))
- {
- tree low = 0, high = 0;
-
- if (TYPE_MIN_VALUE (t))
- low = substitute_in_expr (TYPE_MIN_VALUE (t), f, r);
- if (TYPE_MAX_VALUE (t))
- high = substitute_in_expr (TYPE_MAX_VALUE (t), f, r);
-
- if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
- return t;
-
- t = copy_type (t);
- TYPE_MIN_VALUE (t) = low;
- TYPE_MAX_VALUE (t) = high;
- }
- return t;
-
- case COMPLEX_TYPE:
- tem = gnat_substitute_in_type (TREE_TYPE (t), f, r);
- if (tem == TREE_TYPE (t))
- return t;
-
- return build_complex_type (tem);
-
- case OFFSET_TYPE:
- case METHOD_TYPE:
- case FILE_TYPE:
- case SET_TYPE:
- case FUNCTION_TYPE:
- case LANG_TYPE:
- /* Don't know how to do these yet. */
- abort ();
-
- case ARRAY_TYPE:
- {
- tree component = gnat_substitute_in_type (TREE_TYPE (t), f, r);
- tree domain = gnat_substitute_in_type (TYPE_DOMAIN (t), f, r);
-
- if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
- return t;
-
- new = build_array_type (component, domain);
- TYPE_SIZE (new) = 0;
- TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
- TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
- layout_type (new);
- TYPE_ALIGN (new) = TYPE_ALIGN (t);
- return new;
- }
-
- case RECORD_TYPE:
- case UNION_TYPE:
- case QUAL_UNION_TYPE:
- {
- tree field;
- int changed_field
- = (f == NULL_TREE && ! TREE_CONSTANT (TYPE_SIZE (t)));
- int field_has_rep = 0;
- tree last_field = 0;
-
- tree new = copy_type (t);
-
- /* Start out with no fields, make new fields, and chain them
- in. If we haven't actually changed the type of any field,
- discard everything we've done and return the old type. */
-
- TYPE_FIELDS (new) = 0;
- TYPE_SIZE (new) = 0;
-
- for (field = TYPE_FIELDS (t); field;
- field = TREE_CHAIN (field))
- {
- tree new_field = copy_node (field);
-
- TREE_TYPE (new_field)
- = gnat_substitute_in_type (TREE_TYPE (new_field), f, r);
-
- if (DECL_HAS_REP_P (field) && ! DECL_INTERNAL_P (field))
- field_has_rep = 1;
- else if (TREE_TYPE (new_field) != TREE_TYPE (field))
- changed_field = 1;
-
- /* If this is an internal field and the type of this field is
- a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If
- the type just has one element, treat that as the field.
- But don't do this if we are processing a QUAL_UNION_TYPE. */
- if (TREE_CODE (t) != QUAL_UNION_TYPE
- && DECL_INTERNAL_P (new_field)
- && (TREE_CODE (TREE_TYPE (new_field)) == UNION_TYPE
- || TREE_CODE (TREE_TYPE (new_field)) == RECORD_TYPE))
- {
- if (TYPE_FIELDS (TREE_TYPE (new_field)) == 0)
- continue;
-
- if (TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field))) == 0)
- {
- tree next_new_field
- = copy_node (TYPE_FIELDS (TREE_TYPE (new_field)));
-
- /* Make sure omitting the union doesn't change
- the layout. */
- DECL_ALIGN (next_new_field) = DECL_ALIGN (new_field);
- new_field = next_new_field;
- }
- }
-
- DECL_CONTEXT (new_field) = new;
- DECL_ORIGINAL_FIELD (new_field)
- = DECL_ORIGINAL_FIELD (field) != 0
- ? DECL_ORIGINAL_FIELD (field) : field;
-
- /* If the size of the old field was set at a constant,
- propagate the size in case the type's size was variable.
- (This occurs in the case of a variant or discriminated
- record with a default size used as a field of another
- record.) */
- DECL_SIZE (new_field)
- = TREE_CODE (DECL_SIZE (field)) == INTEGER_CST
- ? DECL_SIZE (field) : 0;
- DECL_SIZE_UNIT (new_field)
- = TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST
- ? DECL_SIZE_UNIT (field) : 0;
-
- if (TREE_CODE (t) == QUAL_UNION_TYPE)
- {
- tree new_q = substitute_in_expr (DECL_QUALIFIER (field), f, r);
-
- if (new_q != DECL_QUALIFIER (new_field))
- changed_field = 1;
-
- /* Do the substitution inside the qualifier and if we find
- that this field will not be present, omit it. */
- DECL_QUALIFIER (new_field) = new_q;
-
- if (integer_zerop (DECL_QUALIFIER (new_field)))
- continue;
- }
-
- if (last_field == 0)
- TYPE_FIELDS (new) = new_field;
- else
- TREE_CHAIN (last_field) = new_field;
-
- last_field = new_field;
-
- /* If this is a qualified type and this field will always be
- present, we are done. */
- if (TREE_CODE (t) == QUAL_UNION_TYPE
- && integer_onep (DECL_QUALIFIER (new_field)))
- break;
- }
-
- /* If this used to be a qualified union type, but we now know what
- field will be present, make this a normal union. */
- if (changed_field && TREE_CODE (new) == QUAL_UNION_TYPE
- && (TYPE_FIELDS (new) == 0
- || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new)))))
- TREE_SET_CODE (new, UNION_TYPE);
- else if (! changed_field)
- return t;
-
- if (field_has_rep)
- gigi_abort (117);
-
- layout_type (new);
-
- /* If the size was originally a constant use it. */
- if (TYPE_SIZE (t) != 0 && TREE_CODE (TYPE_SIZE (t)) == INTEGER_CST
- && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST)
- {
- TYPE_SIZE (new) = TYPE_SIZE (t);
- TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t);
- TYPE_ADA_SIZE (new) = TYPE_ADA_SIZE (t);
- }
-
- return new;
- }
-
- default:
- return t;
- }
-}
-\f
-/* Return the "RM size" of GNU_TYPE. This is the actual number of bits
- needed to represent the object. */
-
-tree
-rm_size (gnu_type)
- tree gnu_type;
-{
- /* For integer types, this is the precision. For record types, we store
- the size explicitly. For other types, this is just the size. */
-
- if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type) != 0)
- return TYPE_RM_SIZE (gnu_type);
- else if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
- /* Return the rm_size of the actual data plus the size of the template. */
- return
- size_binop (PLUS_EXPR,
- rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
- DECL_SIZE (TYPE_FIELDS (gnu_type)));
- else if ((TREE_CODE (gnu_type) == RECORD_TYPE
- || TREE_CODE (gnu_type) == UNION_TYPE
- || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
- && ! TYPE_IS_FAT_POINTER_P (gnu_type)
- && TYPE_ADA_SIZE (gnu_type) != 0)
- return TYPE_ADA_SIZE (gnu_type);
- else
- return TYPE_SIZE (gnu_type);
-}
-\f
-/* Return an identifier representing the external name to be used for
- GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
- and the specified suffix. */
-
-tree
-create_concat_name (gnat_entity, suffix)
- Entity_Id gnat_entity;
- const char *suffix;
-{
- const char *str = (suffix == 0 ? "" : suffix);
- String_Template temp = {1, strlen (str)};
- Fat_Pointer fp = {str, &temp};
-
- Get_External_Name_With_Suffix (gnat_entity, fp);
-
- return get_identifier (Name_Buffer);
-}
-
-/* Return the name to be used for GNAT_ENTITY. If a type, create a
- fully-qualified name, possibly with type information encoding.
- Otherwise, return the name. */
-
-tree
-get_entity_name (gnat_entity)
- Entity_Id gnat_entity;
-{
- Get_Encoded_Name (gnat_entity);
- return get_identifier (Name_Buffer);
-}
-
-/* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
- string, return a new IDENTIFIER_NODE that is the concatenation of
- the name in GNU_ID and SUFFIX. */
-
-tree
-concat_id_with_name (gnu_id, suffix)
- tree gnu_id;
- const char *suffix;
-{
- int len = IDENTIFIER_LENGTH (gnu_id);
-
- strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id),
- IDENTIFIER_LENGTH (gnu_id));
- strncpy (Name_Buffer + len, "___", 3);
- len += 3;
- strcpy (Name_Buffer + len, suffix);
- return get_identifier (Name_Buffer);
-}
projects / msp430-gcc.git / blobdiff