1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2011, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License along with GCC; see the file COPYING3. If not see *
19 * <http://www.gnu.org/licenses/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
28 #include "coretypes.h"
35 #include "tree-inline.h"
53 /* Convention_Stdcall should be processed in a specific way on 32 bits
54 Windows targets only. The macro below is a helper to avoid having to
55 check for a Windows specific attribute throughout this unit. */
57 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
59 #define Has_Stdcall_Convention(E) \
60 (!TARGET_64BIT && Convention (E) == Convention_Stdcall)
62 #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall)
65 #define Has_Stdcall_Convention(E) 0
68 /* Stack realignment is necessary for functions with foreign conventions when
69 the ABI doesn't mandate as much as what the compiler assumes - that is, up
70 to PREFERRED_STACK_BOUNDARY.
72 Such realignment can be requested with a dedicated function type attribute
73 on the targets that support it. We define FOREIGN_FORCE_REALIGN_STACK to
74 characterize the situations where the attribute should be set. We rely on
75 compiler configuration settings for 'main' to decide. */
77 #ifdef MAIN_STACK_BOUNDARY
78 #define FOREIGN_FORCE_REALIGN_STACK \
79 (MAIN_STACK_BOUNDARY < PREFERRED_STACK_BOUNDARY)
81 #define FOREIGN_FORCE_REALIGN_STACK 0
86 struct incomplete *next;
91 /* These variables are used to defer recursively expanding incomplete types
92 while we are processing an array, a record or a subprogram type. */
93 static int defer_incomplete_level = 0;
94 static struct incomplete *defer_incomplete_list;
96 /* This variable is used to delay expanding From_With_Type types until the
98 static struct incomplete *defer_limited_with;
100 /* These variables are used to defer finalizing types. The element of the
101 list is the TYPE_DECL associated with the type. */
102 static int defer_finalize_level = 0;
103 static VEC (tree,heap) *defer_finalize_list;
105 typedef struct subst_pair_d {
110 DEF_VEC_O(subst_pair);
111 DEF_VEC_ALLOC_O(subst_pair,heap);
113 typedef struct variant_desc_d {
114 /* The type of the variant. */
117 /* The associated field. */
120 /* The value of the qualifier. */
123 /* The record associated with this variant. */
127 DEF_VEC_O(variant_desc);
128 DEF_VEC_ALLOC_O(variant_desc,heap);
130 /* A hash table used to cache the result of annotate_value. */
131 static GTY ((if_marked ("tree_int_map_marked_p"),
132 param_is (struct tree_int_map))) htab_t annotate_value_cache;
141 static void relate_alias_sets (tree, tree, enum alias_set_op);
143 static bool allocatable_size_p (tree, bool);
144 static void prepend_one_attribute_to (struct attrib **,
145 enum attr_type, tree, tree, Node_Id);
146 static void prepend_attributes (Entity_Id, struct attrib **);
147 static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool);
148 static bool is_variable_size (tree);
149 static tree elaborate_expression_1 (tree, Entity_Id, tree, bool, bool);
150 static tree elaborate_expression_2 (tree, Entity_Id, tree, bool, bool,
152 static tree make_packable_type (tree, bool);
153 static tree gnat_to_gnu_component_type (Entity_Id, bool, bool);
154 static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool,
156 static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool);
157 static bool same_discriminant_p (Entity_Id, Entity_Id);
158 static bool array_type_has_nonaliased_component (tree, Entity_Id);
159 static bool compile_time_known_address_p (Node_Id);
160 static bool cannot_be_superflat_p (Node_Id);
161 static bool constructor_address_p (tree);
162 static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
163 bool, bool, bool, bool, bool);
164 static Uint annotate_value (tree);
165 static void annotate_rep (Entity_Id, tree);
166 static tree build_position_list (tree, bool, tree, tree, unsigned int, tree);
167 static VEC(subst_pair,heap) *build_subst_list (Entity_Id, Entity_Id, bool);
168 static VEC(variant_desc,heap) *build_variant_list (tree,
169 VEC(subst_pair,heap) *,
170 VEC(variant_desc,heap) *);
171 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
172 static void set_rm_size (Uint, tree, Entity_Id);
173 static tree make_type_from_size (tree, tree, bool);
174 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
175 static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
176 static void check_ok_for_atomic (tree, Entity_Id, bool);
177 static tree create_field_decl_from (tree, tree, tree, tree, tree,
178 VEC(subst_pair,heap) *);
179 static tree get_rep_part (tree);
180 static tree get_variant_part (tree);
181 static tree create_variant_part_from (tree, VEC(variant_desc,heap) *, tree,
182 tree, VEC(subst_pair,heap) *);
183 static void copy_and_substitute_in_size (tree, tree, VEC(subst_pair,heap) *);
184 static void rest_of_type_decl_compilation_no_defer (tree);
185 static void finish_fat_pointer_type (tree, tree);
187 /* The relevant constituents of a subprogram binding to a GCC builtin. Used
188 to pass around calls performing profile compatibility checks. */
191 Entity_Id gnat_entity; /* The Ada subprogram entity. */
192 tree ada_fntype; /* The corresponding GCC type node. */
193 tree btin_fntype; /* The GCC builtin function type node. */
196 static bool intrin_profiles_compatible_p (intrin_binding_t *);
198 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
199 entity, return the equivalent GCC tree for that entity (a ..._DECL node)
200 and associate the ..._DECL node with the input GNAT defining identifier.
202 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
203 initial value (in GCC tree form). This is optional for a variable. For
204 a renamed entity, GNU_EXPR gives the object being renamed.
206 DEFINITION is nonzero if this call is intended for a definition. This is
207 used for separate compilation where it is necessary to know whether an
208 external declaration or a definition must be created if the GCC equivalent
209 was not created previously. The value of 1 is normally used for a nonzero
210 DEFINITION, but a value of 2 is used in special circumstances, defined in
214 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
216 /* Contains the kind of the input GNAT node. */
217 const Entity_Kind kind = Ekind (gnat_entity);
218 /* True if this is a type. */
219 const bool is_type = IN (kind, Type_Kind);
220 /* True if debug info is requested for this entity. */
221 const bool debug_info_p = Needs_Debug_Info (gnat_entity);
222 /* True if this entity is to be considered as imported. */
223 const bool imported_p
224 = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity)));
225 /* For a type, contains the equivalent GNAT node to be used in gigi. */
226 Entity_Id gnat_equiv_type = Empty;
227 /* Temporary used to walk the GNAT tree. */
229 /* Contains the GCC DECL node which is equivalent to the input GNAT node.
230 This node will be associated with the GNAT node by calling at the end
231 of the `switch' statement. */
232 tree gnu_decl = NULL_TREE;
233 /* Contains the GCC type to be used for the GCC node. */
234 tree gnu_type = NULL_TREE;
235 /* Contains the GCC size tree to be used for the GCC node. */
236 tree gnu_size = NULL_TREE;
237 /* Contains the GCC name to be used for the GCC node. */
238 tree gnu_entity_name;
239 /* True if we have already saved gnu_decl as a GNAT association. */
241 /* True if we incremented defer_incomplete_level. */
242 bool this_deferred = false;
243 /* True if we incremented force_global. */
244 bool this_global = false;
245 /* True if we should check to see if elaborated during processing. */
246 bool maybe_present = false;
247 /* True if we made GNU_DECL and its type here. */
248 bool this_made_decl = false;
249 /* Size and alignment of the GCC node, if meaningful. */
250 unsigned int esize = 0, align = 0;
251 /* Contains the list of attributes directly attached to the entity. */
252 struct attrib *attr_list = NULL;
254 /* Since a use of an Itype is a definition, process it as such if it
255 is not in a with'ed unit. */
258 && Is_Itype (gnat_entity)
259 && !present_gnu_tree (gnat_entity)
260 && In_Extended_Main_Code_Unit (gnat_entity))
262 /* Ensure that we are in a subprogram mentioned in the Scope chain of
263 this entity, our current scope is global, or we encountered a task
264 or entry (where we can't currently accurately check scoping). */
265 if (!current_function_decl
266 || DECL_ELABORATION_PROC_P (current_function_decl))
268 process_type (gnat_entity);
269 return get_gnu_tree (gnat_entity);
272 for (gnat_temp = Scope (gnat_entity);
274 gnat_temp = Scope (gnat_temp))
276 if (Is_Type (gnat_temp))
277 gnat_temp = Underlying_Type (gnat_temp);
279 if (Ekind (gnat_temp) == E_Subprogram_Body)
281 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
283 if (IN (Ekind (gnat_temp), Subprogram_Kind)
284 && Present (Protected_Body_Subprogram (gnat_temp)))
285 gnat_temp = Protected_Body_Subprogram (gnat_temp);
287 if (Ekind (gnat_temp) == E_Entry
288 || Ekind (gnat_temp) == E_Entry_Family
289 || Ekind (gnat_temp) == E_Task_Type
290 || (IN (Ekind (gnat_temp), Subprogram_Kind)
291 && present_gnu_tree (gnat_temp)
292 && (current_function_decl
293 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
295 process_type (gnat_entity);
296 return get_gnu_tree (gnat_entity);
300 /* This abort means the Itype has an incorrect scope, i.e. that its
301 scope does not correspond to the subprogram it is declared in. */
305 /* If we've already processed this entity, return what we got last time.
306 If we are defining the node, we should not have already processed it.
307 In that case, we will abort below when we try to save a new GCC tree
308 for this object. We also need to handle the case of getting a dummy
309 type when a Full_View exists. */
310 if ((!definition || (is_type && imported_p))
311 && present_gnu_tree (gnat_entity))
313 gnu_decl = get_gnu_tree (gnat_entity);
315 if (TREE_CODE (gnu_decl) == TYPE_DECL
316 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
317 && IN (kind, Incomplete_Or_Private_Kind)
318 && Present (Full_View (gnat_entity)))
321 = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0);
322 save_gnu_tree (gnat_entity, NULL_TREE, false);
323 save_gnu_tree (gnat_entity, gnu_decl, false);
329 /* If this is a numeric or enumeral type, or an access type, a nonzero
330 Esize must be specified unless it was specified by the programmer. */
331 gcc_assert (!Unknown_Esize (gnat_entity)
332 || Has_Size_Clause (gnat_entity)
333 || (!IN (kind, Numeric_Kind)
334 && !IN (kind, Enumeration_Kind)
335 && (!IN (kind, Access_Kind)
336 || kind == E_Access_Protected_Subprogram_Type
337 || kind == E_Anonymous_Access_Protected_Subprogram_Type
338 || kind == E_Access_Subtype)));
340 /* The RM size must be specified for all discrete and fixed-point types. */
341 gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind)
342 && Unknown_RM_Size (gnat_entity)));
344 /* If we get here, it means we have not yet done anything with this entity.
345 If we are not defining it, it must be a type or an entity that is defined
346 elsewhere or externally, otherwise we should have defined it already. */
347 gcc_assert (definition
348 || type_annotate_only
350 || kind == E_Discriminant
351 || kind == E_Component
353 || (kind == E_Constant && Present (Full_View (gnat_entity)))
354 || Is_Public (gnat_entity));
356 /* Get the name of the entity and set up the line number and filename of
357 the original definition for use in any decl we make. */
358 gnu_entity_name = get_entity_name (gnat_entity);
359 Sloc_to_locus (Sloc (gnat_entity), &input_location);
361 /* For cases when we are not defining (i.e., we are referencing from
362 another compilation unit) public entities, show we are at global level
363 for the purpose of computing scopes. Don't do this for components or
364 discriminants since the relevant test is whether or not the record is
365 being defined. Don't do this for constants either as we'll look into
366 their defining expression in the local context. */
368 && kind != E_Component
369 && kind != E_Discriminant
370 && kind != E_Constant
371 && Is_Public (gnat_entity)
372 && !Is_Statically_Allocated (gnat_entity))
373 force_global++, this_global = true;
375 /* Handle any attributes directly attached to the entity. */
376 if (Has_Gigi_Rep_Item (gnat_entity))
377 prepend_attributes (gnat_entity, &attr_list);
379 /* Do some common processing for types. */
382 /* Compute the equivalent type to be used in gigi. */
383 gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
385 /* Machine_Attributes on types are expected to be propagated to
386 subtypes. The corresponding Gigi_Rep_Items are only attached
387 to the first subtype though, so we handle the propagation here. */
388 if (Base_Type (gnat_entity) != gnat_entity
389 && !Is_First_Subtype (gnat_entity)
390 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
391 prepend_attributes (First_Subtype (Base_Type (gnat_entity)),
394 /* Compute a default value for the size of the type. */
395 if (Known_Esize (gnat_entity)
396 && UI_Is_In_Int_Range (Esize (gnat_entity)))
398 unsigned int max_esize;
399 esize = UI_To_Int (Esize (gnat_entity));
401 if (IN (kind, Float_Kind))
402 max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
403 else if (IN (kind, Access_Kind))
404 max_esize = POINTER_SIZE * 2;
406 max_esize = LONG_LONG_TYPE_SIZE;
408 if (esize > max_esize)
412 esize = LONG_LONG_TYPE_SIZE;
418 /* If this is a use of a deferred constant without address clause,
419 get its full definition. */
421 && No (Address_Clause (gnat_entity))
422 && Present (Full_View (gnat_entity)))
425 = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
430 /* If we have an external constant that we are not defining, get the
431 expression that is was defined to represent. We may throw it away
432 later if it is not a constant. But do not retrieve the expression
433 if it is an allocator because the designated type might be dummy
436 && !No_Initialization (Declaration_Node (gnat_entity))
437 && Present (Expression (Declaration_Node (gnat_entity)))
438 && Nkind (Expression (Declaration_Node (gnat_entity)))
441 bool went_into_elab_proc = false;
443 /* The expression may contain N_Expression_With_Actions nodes and
444 thus object declarations from other units. In this case, even
445 though the expression will eventually be discarded since not a
446 constant, the declarations would be stuck either in the global
447 varpool or in the current scope. Therefore we force the local
448 context and create a fake scope that we'll zap at the end. */
449 if (!current_function_decl)
451 current_function_decl = get_elaboration_procedure ();
452 went_into_elab_proc = true;
456 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
459 if (went_into_elab_proc)
460 current_function_decl = NULL_TREE;
463 /* Ignore deferred constant definitions without address clause since
464 they are processed fully in the front-end. If No_Initialization
465 is set, this is not a deferred constant but a constant whose value
466 is built manually. And constants that are renamings are handled
470 && No (Address_Clause (gnat_entity))
471 && !No_Initialization (Declaration_Node (gnat_entity))
472 && No (Renamed_Object (gnat_entity)))
474 gnu_decl = error_mark_node;
479 /* Ignore constant definitions already marked with the error node. See
480 the N_Object_Declaration case of gnat_to_gnu for the rationale. */
483 && present_gnu_tree (gnat_entity)
484 && get_gnu_tree (gnat_entity) == error_mark_node)
486 maybe_present = true;
493 /* We used to special case VMS exceptions here to directly map them to
494 their associated condition code. Since this code had to be masked
495 dynamically to strip off the severity bits, this caused trouble in
496 the GCC/ZCX case because the "type" pointers we store in the tables
497 have to be static. We now don't special case here anymore, and let
498 the regular processing take place, which leaves us with a regular
499 exception data object for VMS exceptions too. The condition code
500 mapping is taken care of by the front end and the bitmasking by the
507 /* The GNAT record where the component was defined. */
508 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
510 /* If the variable is an inherited record component (in the case of
511 extended record types), just return the inherited entity, which
512 must be a FIELD_DECL. Likewise for discriminants.
513 For discriminants of untagged records which have explicit
514 stored discriminants, return the entity for the corresponding
515 stored discriminant. Also use Original_Record_Component
516 if the record has a private extension. */
517 if (Present (Original_Record_Component (gnat_entity))
518 && Original_Record_Component (gnat_entity) != gnat_entity)
521 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
522 gnu_expr, definition);
527 /* If the enclosing record has explicit stored discriminants,
528 then it is an untagged record. If the Corresponding_Discriminant
529 is not empty then this must be a renamed discriminant and its
530 Original_Record_Component must point to the corresponding explicit
531 stored discriminant (i.e. we should have taken the previous
533 else if (Present (Corresponding_Discriminant (gnat_entity))
534 && Is_Tagged_Type (gnat_record))
536 /* A tagged record has no explicit stored discriminants. */
537 gcc_assert (First_Discriminant (gnat_record)
538 == First_Stored_Discriminant (gnat_record));
540 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
541 gnu_expr, definition);
546 else if (Present (CR_Discriminant (gnat_entity))
547 && type_annotate_only)
549 gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
550 gnu_expr, definition);
555 /* If the enclosing record has explicit stored discriminants, then
556 it is an untagged record. If the Corresponding_Discriminant
557 is not empty then this must be a renamed discriminant and its
558 Original_Record_Component must point to the corresponding explicit
559 stored discriminant (i.e. we should have taken the first
561 else if (Present (Corresponding_Discriminant (gnat_entity))
562 && (First_Discriminant (gnat_record)
563 != First_Stored_Discriminant (gnat_record)))
566 /* Otherwise, if we are not defining this and we have no GCC type
567 for the containing record, make one for it. Then we should
568 have made our own equivalent. */
569 else if (!definition && !present_gnu_tree (gnat_record))
571 /* ??? If this is in a record whose scope is a protected
572 type and we have an Original_Record_Component, use it.
573 This is a workaround for major problems in protected type
575 Entity_Id Scop = Scope (Scope (gnat_entity));
576 if ((Is_Protected_Type (Scop)
577 || (Is_Private_Type (Scop)
578 && Present (Full_View (Scop))
579 && Is_Protected_Type (Full_View (Scop))))
580 && Present (Original_Record_Component (gnat_entity)))
583 = gnat_to_gnu_entity (Original_Record_Component
590 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
591 gnu_decl = get_gnu_tree (gnat_entity);
597 /* Here we have no GCC type and this is a reference rather than a
598 definition. This should never happen. Most likely the cause is
599 reference before declaration in the gnat tree for gnat_entity. */
603 case E_Loop_Parameter:
604 case E_Out_Parameter:
607 /* Simple variables, loop variables, Out parameters and exceptions. */
611 = ((kind == E_Constant || kind == E_Variable)
612 && Is_True_Constant (gnat_entity)
613 && !Treat_As_Volatile (gnat_entity)
614 && (((Nkind (Declaration_Node (gnat_entity))
615 == N_Object_Declaration)
616 && Present (Expression (Declaration_Node (gnat_entity))))
617 || Present (Renamed_Object (gnat_entity))
619 bool inner_const_flag = const_flag;
620 bool static_p = Is_Statically_Allocated (gnat_entity);
621 bool mutable_p = false;
622 bool used_by_ref = false;
623 tree gnu_ext_name = NULL_TREE;
624 tree renamed_obj = NULL_TREE;
625 tree gnu_object_size;
627 if (Present (Renamed_Object (gnat_entity)) && !definition)
629 if (kind == E_Exception)
630 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
633 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
636 /* Get the type after elaborating the renamed object. */
637 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
639 /* If this is a standard exception definition, then use the standard
640 exception type. This is necessary to make sure that imported and
641 exported views of exceptions are properly merged in LTO mode. */
642 if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL
643 && DECL_NAME (TYPE_NAME (gnu_type)) == exception_data_name_id)
644 gnu_type = except_type_node;
646 /* For a debug renaming declaration, build a debug-only entity. */
647 if (Present (Debug_Renaming_Link (gnat_entity)))
649 /* Force a non-null value to make sure the symbol is retained. */
650 tree value = build1 (INDIRECT_REF, gnu_type,
652 build_pointer_type (gnu_type),
653 integer_minus_one_node));
654 gnu_decl = build_decl (input_location,
655 VAR_DECL, gnu_entity_name, gnu_type);
656 SET_DECL_VALUE_EXPR (gnu_decl, value);
657 DECL_HAS_VALUE_EXPR_P (gnu_decl) = 1;
658 gnat_pushdecl (gnu_decl, gnat_entity);
662 /* If this is a loop variable, its type should be the base type.
663 This is because the code for processing a loop determines whether
664 a normal loop end test can be done by comparing the bounds of the
665 loop against those of the base type, which is presumed to be the
666 size used for computation. But this is not correct when the size
667 of the subtype is smaller than the type. */
668 if (kind == E_Loop_Parameter)
669 gnu_type = get_base_type (gnu_type);
671 /* Reject non-renamed objects whose type is an unconstrained array or
672 any object whose type is a dummy type or void. */
673 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
674 && No (Renamed_Object (gnat_entity)))
675 || TYPE_IS_DUMMY_P (gnu_type)
676 || TREE_CODE (gnu_type) == VOID_TYPE)
678 gcc_assert (type_annotate_only);
681 return error_mark_node;
684 /* If an alignment is specified, use it if valid. Note that exceptions
685 are objects but don't have an alignment. We must do this before we
686 validate the size, since the alignment can affect the size. */
687 if (kind != E_Exception && Known_Alignment (gnat_entity))
689 gcc_assert (Present (Alignment (gnat_entity)));
690 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
691 TYPE_ALIGN (gnu_type));
693 /* No point in changing the type if there is an address clause
694 as the final type of the object will be a reference type. */
695 if (Present (Address_Clause (gnat_entity)))
699 = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
700 false, false, definition, true);
703 /* If we are defining the object, see if it has a Size and validate it
704 if so. If we are not defining the object and a Size clause applies,
705 simply retrieve the value. We don't want to ignore the clause and
706 it is expected to have been validated already. Then get the new
709 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
710 gnat_entity, VAR_DECL, false,
711 Has_Size_Clause (gnat_entity));
712 else if (Has_Size_Clause (gnat_entity))
713 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
718 = make_type_from_size (gnu_type, gnu_size,
719 Has_Biased_Representation (gnat_entity));
721 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
722 gnu_size = NULL_TREE;
725 /* If this object has self-referential size, it must be a record with
726 a default discriminant. We are supposed to allocate an object of
727 the maximum size in this case, unless it is a constant with an
728 initializing expression, in which case we can get the size from
729 that. Note that the resulting size may still be a variable, so
730 this may end up with an indirect allocation. */
731 if (No (Renamed_Object (gnat_entity))
732 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
734 if (gnu_expr && kind == E_Constant)
736 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
737 if (CONTAINS_PLACEHOLDER_P (size))
739 /* If the initializing expression is itself a constant,
740 despite having a nominal type with self-referential
741 size, we can get the size directly from it. */
742 if (TREE_CODE (gnu_expr) == COMPONENT_REF
744 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
745 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
746 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
747 || DECL_READONLY_ONCE_ELAB
748 (TREE_OPERAND (gnu_expr, 0))))
749 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
752 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
757 /* We may have no GNU_EXPR because No_Initialization is
758 set even though there's an Expression. */
759 else if (kind == E_Constant
760 && (Nkind (Declaration_Node (gnat_entity))
761 == N_Object_Declaration)
762 && Present (Expression (Declaration_Node (gnat_entity))))
764 = TYPE_SIZE (gnat_to_gnu_type
766 (Expression (Declaration_Node (gnat_entity)))));
769 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
774 /* If the size is zero byte, make it one byte since some linkers have
775 troubles with zero-sized objects. If the object will have a
776 template, that will make it nonzero so don't bother. Also avoid
777 doing that for an object renaming or an object with an address
778 clause, as we would lose useful information on the view size
779 (e.g. for null array slices) and we are not allocating the object
782 && integer_zerop (gnu_size)
783 && !TREE_OVERFLOW (gnu_size))
784 || (TYPE_SIZE (gnu_type)
785 && integer_zerop (TYPE_SIZE (gnu_type))
786 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
787 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
788 || !Is_Array_Type (Etype (gnat_entity)))
789 && No (Renamed_Object (gnat_entity))
790 && No (Address_Clause (gnat_entity)))
791 gnu_size = bitsize_unit_node;
793 /* If this is an object with no specified size and alignment, and
794 if either it is atomic or we are not optimizing alignment for
795 space and it is composite and not an exception, an Out parameter
796 or a reference to another object, and the size of its type is a
797 constant, set the alignment to the smallest one which is not
798 smaller than the size, with an appropriate cap. */
799 if (!gnu_size && align == 0
800 && (Is_Atomic (gnat_entity)
801 || (!Optimize_Alignment_Space (gnat_entity)
802 && kind != E_Exception
803 && kind != E_Out_Parameter
804 && Is_Composite_Type (Etype (gnat_entity))
805 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
806 && !Is_Exported (gnat_entity)
808 && No (Renamed_Object (gnat_entity))
809 && No (Address_Clause (gnat_entity))))
810 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
812 /* No point in jumping through all the hoops needed in order
813 to support BIGGEST_ALIGNMENT if we don't really have to.
814 So we cap to the smallest alignment that corresponds to
815 a known efficient memory access pattern of the target. */
816 unsigned int align_cap = Is_Atomic (gnat_entity)
818 : get_mode_alignment (ptr_mode);
820 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
821 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
824 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
826 /* But make sure not to under-align the object. */
827 if (align <= TYPE_ALIGN (gnu_type))
830 /* And honor the minimum valid atomic alignment, if any. */
831 #ifdef MINIMUM_ATOMIC_ALIGNMENT
832 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
833 align = MINIMUM_ATOMIC_ALIGNMENT;
837 /* If the object is set to have atomic components, find the component
838 type and validate it.
840 ??? Note that we ignore Has_Volatile_Components on objects; it's
841 not at all clear what to do in that case. */
842 if (Has_Atomic_Components (gnat_entity))
844 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
845 ? TREE_TYPE (gnu_type) : gnu_type);
847 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
848 && TYPE_MULTI_ARRAY_P (gnu_inner))
849 gnu_inner = TREE_TYPE (gnu_inner);
851 check_ok_for_atomic (gnu_inner, gnat_entity, true);
854 /* Now check if the type of the object allows atomic access. Note
855 that we must test the type, even if this object has size and
856 alignment to allow such access, because we will be going inside
857 the padded record to assign to the object. We could fix this by
858 always copying via an intermediate value, but it's not clear it's
860 if (Is_Atomic (gnat_entity))
861 check_ok_for_atomic (gnu_type, gnat_entity, false);
863 /* If this is an aliased object with an unconstrained nominal subtype,
864 make a type that includes the template. */
865 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
866 && Is_Array_Type (Etype (gnat_entity))
867 && !type_annotate_only)
870 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
873 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
874 concat_name (gnu_entity_name,
879 #ifdef MINIMUM_ATOMIC_ALIGNMENT
880 /* If the size is a constant and no alignment is specified, force
881 the alignment to be the minimum valid atomic alignment. The
882 restriction on constant size avoids problems with variable-size
883 temporaries; if the size is variable, there's no issue with
884 atomic access. Also don't do this for a constant, since it isn't
885 necessary and can interfere with constant replacement. Finally,
886 do not do it for Out parameters since that creates an
887 size inconsistency with In parameters. */
888 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
889 && !FLOAT_TYPE_P (gnu_type)
890 && !const_flag && No (Renamed_Object (gnat_entity))
891 && !imported_p && No (Address_Clause (gnat_entity))
892 && kind != E_Out_Parameter
893 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
894 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
895 align = MINIMUM_ATOMIC_ALIGNMENT;
898 /* Make a new type with the desired size and alignment, if needed.
899 But do not take into account alignment promotions to compute the
900 size of the object. */
901 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
902 if (gnu_size || align > 0)
903 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
904 false, false, definition,
905 gnu_size ? true : false);
907 /* If this is a renaming, avoid as much as possible to create a new
908 object. However, in several cases, creating it is required.
909 This processing needs to be applied to the raw expression so
910 as to make it more likely to rename the underlying object. */
911 if (Present (Renamed_Object (gnat_entity)))
913 bool create_normal_object = false;
915 /* If the renamed object had padding, strip off the reference
916 to the inner object and reset our type. */
917 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
918 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
919 /* Strip useless conversions around the object. */
920 || (TREE_CODE (gnu_expr) == NOP_EXPR
921 && gnat_types_compatible_p
922 (TREE_TYPE (gnu_expr),
923 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
925 gnu_expr = TREE_OPERAND (gnu_expr, 0);
926 gnu_type = TREE_TYPE (gnu_expr);
929 /* Case 1: If this is a constant renaming stemming from a function
930 call, treat it as a normal object whose initial value is what
931 is being renamed. RM 3.3 says that the result of evaluating a
932 function call is a constant object. As a consequence, it can
933 be the inner object of a constant renaming. In this case, the
934 renaming must be fully instantiated, i.e. it cannot be a mere
935 reference to (part of) an existing object. */
938 tree inner_object = gnu_expr;
939 while (handled_component_p (inner_object))
940 inner_object = TREE_OPERAND (inner_object, 0);
941 if (TREE_CODE (inner_object) == CALL_EXPR)
942 create_normal_object = true;
945 /* Otherwise, see if we can proceed with a stabilized version of
946 the renamed entity or if we need to make a new object. */
947 if (!create_normal_object)
949 tree maybe_stable_expr = NULL_TREE;
952 /* Case 2: If the renaming entity need not be materialized and
953 the renamed expression is something we can stabilize, use
954 that for the renaming. At the global level, we can only do
955 this if we know no SAVE_EXPRs need be made, because the
956 expression we return might be used in arbitrary conditional
957 branches so we must force the evaluation of the SAVE_EXPRs
958 immediately and this requires a proper function context.
959 Note that an external constant is at the global level. */
960 if (!Materialize_Entity (gnat_entity)
961 && (!((!definition && kind == E_Constant)
962 || global_bindings_p ())
963 || (staticp (gnu_expr)
964 && !TREE_SIDE_EFFECTS (gnu_expr))))
967 = gnat_stabilize_reference (gnu_expr, true, &stable);
971 /* ??? No DECL_EXPR is created so we need to mark
972 the expression manually lest it is shared. */
973 if ((!definition && kind == E_Constant)
974 || global_bindings_p ())
975 MARK_VISITED (maybe_stable_expr);
976 gnu_decl = maybe_stable_expr;
977 save_gnu_tree (gnat_entity, gnu_decl, true);
979 annotate_object (gnat_entity, gnu_type, NULL_TREE,
984 /* The stabilization failed. Keep maybe_stable_expr
985 untouched here to let the pointer case below know
986 about that failure. */
989 /* Case 3: If this is a constant renaming and creating a
990 new object is allowed and cheap, treat it as a normal
991 object whose initial value is what is being renamed. */
993 && !Is_Composite_Type
994 (Underlying_Type (Etype (gnat_entity))))
997 /* Case 4: Make this into a constant pointer to the object we
998 are to rename and attach the object to the pointer if it is
999 something we can stabilize.
1001 From the proper scope, attached objects will be referenced
1002 directly instead of indirectly via the pointer to avoid
1003 subtle aliasing problems with non-addressable entities.
1004 They have to be stable because we must not evaluate the
1005 variables in the expression every time the renaming is used.
1006 The pointer is called a "renaming" pointer in this case.
1008 In the rare cases where we cannot stabilize the renamed
1009 object, we just make a "bare" pointer, and the renamed
1010 entity is always accessed indirectly through it. */
1013 gnu_type = build_reference_type (gnu_type);
1014 inner_const_flag = TREE_READONLY (gnu_expr);
1017 /* If the previous attempt at stabilizing failed, there
1018 is no point in trying again and we reuse the result
1019 without attaching it to the pointer. In this case it
1020 will only be used as the initializing expression of
1021 the pointer and thus needs no special treatment with
1022 regard to multiple evaluations. */
1023 if (maybe_stable_expr)
1026 /* Otherwise, try to stabilize and attach the expression
1027 to the pointer if the stabilization succeeds.
1029 Note that this might introduce SAVE_EXPRs and we don't
1030 check whether we're at the global level or not. This
1031 is fine since we are building a pointer initializer and
1032 neither the pointer nor the initializing expression can
1033 be accessed before the pointer elaboration has taken
1034 place in a correct program.
1036 These SAVE_EXPRs will be evaluated at the right place
1037 by either the evaluation of the initializer for the
1038 non-global case or the elaboration code for the global
1039 case, and will be attached to the elaboration procedure
1040 in the latter case. */
1044 = gnat_stabilize_reference (gnu_expr, true, &stable);
1047 renamed_obj = maybe_stable_expr;
1049 /* Attaching is actually performed downstream, as soon
1050 as we have a VAR_DECL for the pointer we make. */
1053 gnu_expr = build_unary_op (ADDR_EXPR, gnu_type,
1056 gnu_size = NULL_TREE;
1062 /* Make a volatile version of this object's type if we are to make
1063 the object volatile. We also interpret 13.3(19) conservatively
1064 and disallow any optimizations for such a non-constant object. */
1065 if ((Treat_As_Volatile (gnat_entity)
1067 && gnu_type != except_type_node
1068 && (Is_Exported (gnat_entity)
1070 || Present (Address_Clause (gnat_entity)))))
1071 && !TYPE_VOLATILE (gnu_type))
1072 gnu_type = build_qualified_type (gnu_type,
1073 (TYPE_QUALS (gnu_type)
1074 | TYPE_QUAL_VOLATILE));
1076 /* If we are defining an aliased object whose nominal subtype is
1077 unconstrained, the object is a record that contains both the
1078 template and the object. If there is an initializer, it will
1079 have already been converted to the right type, but we need to
1080 create the template if there is no initializer. */
1083 && TREE_CODE (gnu_type) == RECORD_TYPE
1084 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1085 /* Beware that padding might have been introduced above. */
1086 || (TYPE_PADDING_P (gnu_type)
1087 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1089 && TYPE_CONTAINS_TEMPLATE_P
1090 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1093 = TYPE_PADDING_P (gnu_type)
1094 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1095 : TYPE_FIELDS (gnu_type);
1096 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 1);
1097 tree t = build_template (TREE_TYPE (template_field),
1098 TREE_TYPE (DECL_CHAIN (template_field)),
1100 CONSTRUCTOR_APPEND_ELT (v, template_field, t);
1101 gnu_expr = gnat_build_constructor (gnu_type, v);
1104 /* Convert the expression to the type of the object except in the
1105 case where the object's type is unconstrained or the object's type
1106 is a padded record whose field is of self-referential size. In
1107 the former case, converting will generate unnecessary evaluations
1108 of the CONSTRUCTOR to compute the size and in the latter case, we
1109 want to only copy the actual data. */
1111 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1112 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1113 && !(TYPE_IS_PADDING_P (gnu_type)
1114 && CONTAINS_PLACEHOLDER_P
1115 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1116 gnu_expr = convert (gnu_type, gnu_expr);
1118 /* If this is a pointer that doesn't have an initializing expression,
1119 initialize it to NULL, unless the object is imported. */
1121 && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type))
1123 && !Is_Imported (gnat_entity))
1124 gnu_expr = integer_zero_node;
1126 /* If we are defining the object and it has an Address clause, we must
1127 either get the address expression from the saved GCC tree for the
1128 object if it has a Freeze node, or elaborate the address expression
1129 here since the front-end has guaranteed that the elaboration has no
1130 effects in this case. */
1131 if (definition && Present (Address_Clause (gnat_entity)))
1133 Node_Id gnat_expr = Expression (Address_Clause (gnat_entity));
1135 = present_gnu_tree (gnat_entity)
1136 ? get_gnu_tree (gnat_entity) : gnat_to_gnu (gnat_expr);
1138 save_gnu_tree (gnat_entity, NULL_TREE, false);
1140 /* Ignore the size. It's either meaningless or was handled
1142 gnu_size = NULL_TREE;
1143 /* Convert the type of the object to a reference type that can
1144 alias everything as per 13.3(19). */
1146 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1147 gnu_address = convert (gnu_type, gnu_address);
1150 = !Is_Public (gnat_entity)
1151 || compile_time_known_address_p (gnat_expr);
1153 /* If this is a deferred constant, the initializer is attached to
1155 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1158 (Expression (Declaration_Node (Full_View (gnat_entity))));
1160 /* If we don't have an initializing expression for the underlying
1161 variable, the initializing expression for the pointer is the
1162 specified address. Otherwise, we have to make a COMPOUND_EXPR
1163 to assign both the address and the initial value. */
1165 gnu_expr = gnu_address;
1168 = build2 (COMPOUND_EXPR, gnu_type,
1170 (MODIFY_EXPR, NULL_TREE,
1171 build_unary_op (INDIRECT_REF, NULL_TREE,
1177 /* If it has an address clause and we are not defining it, mark it
1178 as an indirect object. Likewise for Stdcall objects that are
1180 if ((!definition && Present (Address_Clause (gnat_entity)))
1181 || (Is_Imported (gnat_entity)
1182 && Has_Stdcall_Convention (gnat_entity)))
1184 /* Convert the type of the object to a reference type that can
1185 alias everything as per 13.3(19). */
1187 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1188 gnu_size = NULL_TREE;
1190 /* No point in taking the address of an initializing expression
1191 that isn't going to be used. */
1192 gnu_expr = NULL_TREE;
1194 /* If it has an address clause whose value is known at compile
1195 time, make the object a CONST_DECL. This will avoid a
1196 useless dereference. */
1197 if (Present (Address_Clause (gnat_entity)))
1199 Node_Id gnat_address
1200 = Expression (Address_Clause (gnat_entity));
1202 if (compile_time_known_address_p (gnat_address))
1204 gnu_expr = gnat_to_gnu (gnat_address);
1212 /* If we are at top level and this object is of variable size,
1213 make the actual type a hidden pointer to the real type and
1214 make the initializer be a memory allocation and initialization.
1215 Likewise for objects we aren't defining (presumed to be
1216 external references from other packages), but there we do
1217 not set up an initialization.
1219 If the object's size overflows, make an allocator too, so that
1220 Storage_Error gets raised. Note that we will never free
1221 such memory, so we presume it never will get allocated. */
1222 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1223 global_bindings_p ()
1226 || (gnu_size && !allocatable_size_p (gnu_size,
1227 global_bindings_p ()
1231 gnu_type = build_reference_type (gnu_type);
1232 gnu_size = NULL_TREE;
1235 /* In case this was a aliased object whose nominal subtype is
1236 unconstrained, the pointer above will be a thin pointer and
1237 build_allocator will automatically make the template.
1239 If we have a template initializer only (that we made above),
1240 pretend there is none and rely on what build_allocator creates
1241 again anyway. Otherwise (if we have a full initializer), get
1242 the data part and feed that to build_allocator.
1244 If we are elaborating a mutable object, tell build_allocator to
1245 ignore a possibly simpler size from the initializer, if any, as
1246 we must allocate the maximum possible size in this case. */
1247 if (definition && !imported_p)
1249 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1251 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1252 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1255 = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1257 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1258 && 1 == VEC_length (constructor_elt,
1259 CONSTRUCTOR_ELTS (gnu_expr)))
1263 = build_component_ref
1264 (gnu_expr, NULL_TREE,
1265 DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1269 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1270 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type)))
1271 post_error ("?`Storage_Error` will be raised at run time!",
1275 = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1276 Empty, Empty, gnat_entity, mutable_p);
1281 gnu_expr = NULL_TREE;
1286 /* If this object would go into the stack and has an alignment larger
1287 than the largest stack alignment the back-end can honor, resort to
1288 a variable of "aligning type". */
1289 if (!global_bindings_p () && !static_p && definition
1290 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1292 /* Create the new variable. No need for extra room before the
1293 aligned field as this is in automatic storage. */
1295 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1296 TYPE_SIZE_UNIT (gnu_type),
1297 BIGGEST_ALIGNMENT, 0);
1299 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1300 NULL_TREE, gnu_new_type, NULL_TREE, false,
1301 false, false, false, NULL, gnat_entity);
1303 /* Initialize the aligned field if we have an initializer. */
1306 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1308 (gnu_new_var, NULL_TREE,
1309 TYPE_FIELDS (gnu_new_type), false),
1313 /* And setup this entity as a reference to the aligned field. */
1314 gnu_type = build_reference_type (gnu_type);
1317 (ADDR_EXPR, gnu_type,
1318 build_component_ref (gnu_new_var, NULL_TREE,
1319 TYPE_FIELDS (gnu_new_type), false));
1321 gnu_size = NULL_TREE;
1327 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1328 | TYPE_QUAL_CONST));
1330 /* Convert the expression to the type of the object except in the
1331 case where the object's type is unconstrained or the object's type
1332 is a padded record whose field is of self-referential size. In
1333 the former case, converting will generate unnecessary evaluations
1334 of the CONSTRUCTOR to compute the size and in the latter case, we
1335 want to only copy the actual data. */
1337 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1338 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1339 && !(TYPE_IS_PADDING_P (gnu_type)
1340 && CONTAINS_PLACEHOLDER_P
1341 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1342 gnu_expr = convert (gnu_type, gnu_expr);
1344 /* If this name is external or there was a name specified, use it,
1345 unless this is a VMS exception object since this would conflict
1346 with the symbol we need to export in addition. Don't use the
1347 Interface_Name if there is an address clause (see CD30005). */
1348 if (!Is_VMS_Exception (gnat_entity)
1349 && ((Present (Interface_Name (gnat_entity))
1350 && No (Address_Clause (gnat_entity)))
1351 || (Is_Public (gnat_entity)
1352 && (!Is_Imported (gnat_entity)
1353 || Is_Exported (gnat_entity)))))
1354 gnu_ext_name = create_concat_name (gnat_entity, NULL);
1356 /* If this is an aggregate constant initialized to a constant, force it
1357 to be statically allocated. This saves an initialization copy. */
1360 && gnu_expr && TREE_CONSTANT (gnu_expr)
1361 && AGGREGATE_TYPE_P (gnu_type)
1362 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1363 && !(TYPE_IS_PADDING_P (gnu_type)
1364 && !host_integerp (TYPE_SIZE_UNIT
1365 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1368 /* Now create the variable or the constant and set various flags. */
1370 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1371 gnu_expr, const_flag, Is_Public (gnat_entity),
1372 imported_p || !definition, static_p, attr_list,
1374 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1375 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1377 /* If we are defining an Out parameter and optimization isn't enabled,
1378 create a fake PARM_DECL for debugging purposes and make it point to
1379 the VAR_DECL. Suppress debug info for the latter but make sure it
1380 will live on the stack so that it can be accessed from within the
1381 debugger through the PARM_DECL. */
1382 if (kind == E_Out_Parameter && definition && !optimize && debug_info_p)
1384 tree param = create_param_decl (gnu_entity_name, gnu_type, false);
1385 gnat_pushdecl (param, gnat_entity);
1386 SET_DECL_VALUE_EXPR (param, gnu_decl);
1387 DECL_HAS_VALUE_EXPR_P (param) = 1;
1388 DECL_IGNORED_P (gnu_decl) = 1;
1389 TREE_ADDRESSABLE (gnu_decl) = 1;
1392 /* If this is a renaming pointer, attach the renamed object to it and
1393 register it if we are at the global level. Note that an external
1394 constant is at the global level. */
1395 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1397 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1398 if ((!definition && kind == E_Constant) || global_bindings_p ())
1400 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1401 record_global_renaming_pointer (gnu_decl);
1405 /* If this is a constant and we are defining it or it generates a real
1406 symbol at the object level and we are referencing it, we may want
1407 or need to have a true variable to represent it:
1408 - if optimization isn't enabled, for debugging purposes,
1409 - if the constant is public and not overlaid on something else,
1410 - if its address is taken,
1411 - if either itself or its type is aliased. */
1412 if (TREE_CODE (gnu_decl) == CONST_DECL
1413 && (definition || Sloc (gnat_entity) > Standard_Location)
1414 && ((!optimize && debug_info_p)
1415 || (Is_Public (gnat_entity)
1416 && No (Address_Clause (gnat_entity)))
1417 || Address_Taken (gnat_entity)
1418 || Is_Aliased (gnat_entity)
1419 || Is_Aliased (Etype (gnat_entity))))
1422 = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1423 gnu_expr, true, Is_Public (gnat_entity),
1424 !definition, static_p, attr_list,
1427 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1429 /* As debugging information will be generated for the variable,
1430 do not generate debugging information for the constant. */
1432 DECL_IGNORED_P (gnu_decl) = 1;
1434 DECL_IGNORED_P (gnu_corr_var) = 1;
1437 /* If this is a constant, even if we don't need a true variable, we
1438 may need to avoid returning the initializer in every case. That
1439 can happen for the address of a (constant) constructor because,
1440 upon dereferencing it, the constructor will be reinjected in the
1441 tree, which may not be valid in every case; see lvalue_required_p
1442 for more details. */
1443 if (TREE_CODE (gnu_decl) == CONST_DECL)
1444 DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr);
1446 /* If this object is declared in a block that contains a block with an
1447 exception handler, and we aren't using the GCC exception mechanism,
1448 we must force this variable in memory in order to avoid an invalid
1450 if (Exception_Mechanism != Back_End_Exceptions
1451 && Has_Nested_Block_With_Handler (Scope (gnat_entity)))
1452 TREE_ADDRESSABLE (gnu_decl) = 1;
1454 /* If we are defining an object with variable size or an object with
1455 fixed size that will be dynamically allocated, and we are using the
1456 setjmp/longjmp exception mechanism, update the setjmp buffer. */
1458 && Exception_Mechanism == Setjmp_Longjmp
1459 && get_block_jmpbuf_decl ()
1460 && DECL_SIZE_UNIT (gnu_decl)
1461 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1462 || (flag_stack_check == GENERIC_STACK_CHECK
1463 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1464 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1465 add_stmt_with_node (build_call_1_expr
1466 (update_setjmp_buf_decl,
1467 build_unary_op (ADDR_EXPR, NULL_TREE,
1468 get_block_jmpbuf_decl ())),
1471 /* Back-annotate Esize and Alignment of the object if not already
1472 known. Note that we pick the values of the type, not those of
1473 the object, to shield ourselves from low-level platform-dependent
1474 adjustments like alignment promotion. This is both consistent with
1475 all the treatment above, where alignment and size are set on the
1476 type of the object and not on the object directly, and makes it
1477 possible to support all confirming representation clauses. */
1478 annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size,
1479 used_by_ref, false);
1484 /* Return a TYPE_DECL for "void" that we previously made. */
1485 gnu_decl = TYPE_NAME (void_type_node);
1488 case E_Enumeration_Type:
1489 /* A special case: for the types Character and Wide_Character in
1490 Standard, we do not list all the literals. So if the literals
1491 are not specified, make this an unsigned type. */
1492 if (No (First_Literal (gnat_entity)))
1494 gnu_type = make_unsigned_type (esize);
1495 TYPE_NAME (gnu_type) = gnu_entity_name;
1497 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1498 This is needed by the DWARF-2 back-end to distinguish between
1499 unsigned integer types and character types. */
1500 TYPE_STRING_FLAG (gnu_type) = 1;
1505 /* We have a list of enumeral constants in First_Literal. We make a
1506 CONST_DECL for each one and build into GNU_LITERAL_LIST the list to
1507 be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST
1508 whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the
1509 value of the literal. But when we have a regular boolean type, we
1510 simplify this a little by using a BOOLEAN_TYPE. */
1511 bool is_boolean = Is_Boolean_Type (gnat_entity)
1512 && !Has_Non_Standard_Rep (gnat_entity);
1513 tree gnu_literal_list = NULL_TREE;
1514 Entity_Id gnat_literal;
1516 if (Is_Unsigned_Type (gnat_entity))
1517 gnu_type = make_unsigned_type (esize);
1519 gnu_type = make_signed_type (esize);
1521 TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE);
1523 for (gnat_literal = First_Literal (gnat_entity);
1524 Present (gnat_literal);
1525 gnat_literal = Next_Literal (gnat_literal))
1528 = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type);
1530 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1531 gnu_type, gnu_value, true, false, false,
1532 false, NULL, gnat_literal);
1533 /* Do not generate debug info for individual enumerators. */
1534 DECL_IGNORED_P (gnu_literal) = 1;
1535 save_gnu_tree (gnat_literal, gnu_literal, false);
1536 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1537 gnu_value, gnu_literal_list);
1541 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1543 /* Note that the bounds are updated at the end of this function
1544 to avoid an infinite recursion since they refer to the type. */
1548 case E_Signed_Integer_Type:
1549 case E_Ordinary_Fixed_Point_Type:
1550 case E_Decimal_Fixed_Point_Type:
1551 /* For integer types, just make a signed type the appropriate number
1553 gnu_type = make_signed_type (esize);
1556 case E_Modular_Integer_Type:
1558 /* For modular types, make the unsigned type of the proper number
1559 of bits and then set up the modulus, if required. */
1560 tree gnu_modulus, gnu_high = NULL_TREE;
1562 /* Packed array types are supposed to be subtypes only. */
1563 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1565 gnu_type = make_unsigned_type (esize);
1567 /* Get the modulus in this type. If it overflows, assume it is because
1568 it is equal to 2**Esize. Note that there is no overflow checking
1569 done on unsigned type, so we detect the overflow by looking for
1570 a modulus of zero, which is otherwise invalid. */
1571 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1573 if (!integer_zerop (gnu_modulus))
1575 TYPE_MODULAR_P (gnu_type) = 1;
1576 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1577 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1578 convert (gnu_type, integer_one_node));
1581 /* If the upper bound is not maximal, make an extra subtype. */
1583 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1585 tree gnu_subtype = make_unsigned_type (esize);
1586 SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high);
1587 TREE_TYPE (gnu_subtype) = gnu_type;
1588 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1589 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1590 gnu_type = gnu_subtype;
1595 case E_Signed_Integer_Subtype:
1596 case E_Enumeration_Subtype:
1597 case E_Modular_Integer_Subtype:
1598 case E_Ordinary_Fixed_Point_Subtype:
1599 case E_Decimal_Fixed_Point_Subtype:
1601 /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
1602 not want to call create_range_type since we would like each subtype
1603 node to be distinct. ??? Historically this was in preparation for
1604 when memory aliasing is implemented, but that's obsolete now given
1605 the call to relate_alias_sets below.
1607 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1608 this fact is used by the arithmetic conversion functions.
1610 We elaborate the Ancestor_Subtype if it is not in the current unit
1611 and one of our bounds is non-static. We do this to ensure consistent
1612 naming in the case where several subtypes share the same bounds, by
1613 elaborating the first such subtype first, thus using its name. */
1616 && Present (Ancestor_Subtype (gnat_entity))
1617 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1618 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1619 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1620 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1622 /* Set the precision to the Esize except for bit-packed arrays. */
1623 if (Is_Packed_Array_Type (gnat_entity)
1624 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1625 esize = UI_To_Int (RM_Size (gnat_entity));
1627 /* This should be an unsigned type if the base type is unsigned or
1628 if the lower bound is constant and non-negative or if the type
1630 if (Is_Unsigned_Type (Etype (gnat_entity))
1631 || Is_Unsigned_Type (gnat_entity)
1632 || Has_Biased_Representation (gnat_entity))
1633 gnu_type = make_unsigned_type (esize);
1635 gnu_type = make_signed_type (esize);
1636 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1638 SET_TYPE_RM_MIN_VALUE
1640 convert (TREE_TYPE (gnu_type),
1641 elaborate_expression (Type_Low_Bound (gnat_entity),
1642 gnat_entity, get_identifier ("L"),
1644 Needs_Debug_Info (gnat_entity))));
1646 SET_TYPE_RM_MAX_VALUE
1648 convert (TREE_TYPE (gnu_type),
1649 elaborate_expression (Type_High_Bound (gnat_entity),
1650 gnat_entity, get_identifier ("U"),
1652 Needs_Debug_Info (gnat_entity))));
1654 /* One of the above calls might have caused us to be elaborated,
1655 so don't blow up if so. */
1656 if (present_gnu_tree (gnat_entity))
1658 maybe_present = true;
1662 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1663 = Has_Biased_Representation (gnat_entity);
1665 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
1666 TYPE_STUB_DECL (gnu_type)
1667 = create_type_stub_decl (gnu_entity_name, gnu_type);
1669 /* Inherit our alias set from what we're a subtype of. Subtypes
1670 are not different types and a pointer can designate any instance
1671 within a subtype hierarchy. */
1672 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1674 /* For a packed array, make the original array type a parallel type. */
1676 && Is_Packed_Array_Type (gnat_entity)
1677 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1678 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1680 (Original_Array_Type (gnat_entity)));
1684 /* We have to handle clauses that under-align the type specially. */
1685 if ((Present (Alignment_Clause (gnat_entity))
1686 || (Is_Packed_Array_Type (gnat_entity)
1688 (Alignment_Clause (Original_Array_Type (gnat_entity)))))
1689 && UI_Is_In_Int_Range (Alignment (gnat_entity)))
1691 align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT;
1692 if (align >= TYPE_ALIGN (gnu_type))
1696 /* If the type we are dealing with represents a bit-packed array,
1697 we need to have the bits left justified on big-endian targets
1698 and right justified on little-endian targets. We also need to
1699 ensure that when the value is read (e.g. for comparison of two
1700 such values), we only get the good bits, since the unused bits
1701 are uninitialized. Both goals are accomplished by wrapping up
1702 the modular type in an enclosing record type. */
1703 if (Is_Packed_Array_Type (gnat_entity)
1704 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1706 tree gnu_field_type, gnu_field;
1708 /* Set the RM size before wrapping up the original type. */
1709 SET_TYPE_RM_SIZE (gnu_type,
1710 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1711 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1713 /* Create a stripped-down declaration, mainly for debugging. */
1714 create_type_decl (gnu_entity_name, gnu_type, NULL, true,
1715 debug_info_p, gnat_entity);
1717 /* Now save it and build the enclosing record type. */
1718 gnu_field_type = gnu_type;
1720 gnu_type = make_node (RECORD_TYPE);
1721 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1722 TYPE_PACKED (gnu_type) = 1;
1723 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
1724 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
1725 SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
1727 /* Propagate the alignment of the modular type to the record type,
1728 unless there is an alignment clause that under-aligns the type.
1729 This means that bit-packed arrays are given "ceil" alignment for
1730 their size by default, which may seem counter-intuitive but makes
1731 it possible to overlay them on modular types easily. */
1732 TYPE_ALIGN (gnu_type)
1733 = align > 0 ? align : TYPE_ALIGN (gnu_field_type);
1735 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1737 /* Don't declare the field as addressable since we won't be taking
1738 its address and this would prevent create_field_decl from making
1741 = create_field_decl (get_identifier ("OBJECT"), gnu_field_type,
1742 gnu_type, NULL_TREE, bitsize_zero_node, 1, 0);
1744 /* Do not emit debug info until after the parallel type is added. */
1745 finish_record_type (gnu_type, gnu_field, 2, false);
1746 compute_record_mode (gnu_type);
1747 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1751 /* Make the original array type a parallel type. */
1752 if (present_gnu_tree (Original_Array_Type (gnat_entity)))
1753 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1755 (Original_Array_Type (gnat_entity)));
1757 rest_of_record_type_compilation (gnu_type);
1761 /* If the type we are dealing with has got a smaller alignment than the
1762 natural one, we need to wrap it up in a record type and under-align
1763 the latter. We reuse the padding machinery for this purpose. */
1766 tree gnu_field_type, gnu_field;
1768 /* Set the RM size before wrapping up the type. */
1769 SET_TYPE_RM_SIZE (gnu_type,
1770 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1772 /* Create a stripped-down declaration, mainly for debugging. */
1773 create_type_decl (gnu_entity_name, gnu_type, NULL, true,
1774 debug_info_p, gnat_entity);
1776 /* Now save it and build the enclosing record type. */
1777 gnu_field_type = gnu_type;
1779 gnu_type = make_node (RECORD_TYPE);
1780 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1781 TYPE_PACKED (gnu_type) = 1;
1782 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
1783 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
1784 SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
1785 TYPE_ALIGN (gnu_type) = align;
1786 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1788 /* Don't declare the field as addressable since we won't be taking
1789 its address and this would prevent create_field_decl from making
1792 = create_field_decl (get_identifier ("F"), gnu_field_type,
1793 gnu_type, NULL_TREE, bitsize_zero_node, 1, 0);
1795 finish_record_type (gnu_type, gnu_field, 2, debug_info_p);
1796 compute_record_mode (gnu_type);
1797 TYPE_PADDING_P (gnu_type) = 1;
1802 case E_Floating_Point_Type:
1803 /* If this is a VAX floating-point type, use an integer of the proper
1804 size. All the operations will be handled with ASM statements. */
1805 if (Vax_Float (gnat_entity))
1807 gnu_type = make_signed_type (esize);
1808 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1809 SET_TYPE_DIGITS_VALUE (gnu_type,
1810 UI_To_gnu (Digits_Value (gnat_entity),
1815 /* The type of the Low and High bounds can be our type if this is
1816 a type from Standard, so set them at the end of the function. */
1817 gnu_type = make_node (REAL_TYPE);
1818 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1819 layout_type (gnu_type);
1822 case E_Floating_Point_Subtype:
1823 if (Vax_Float (gnat_entity))
1825 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1831 && Present (Ancestor_Subtype (gnat_entity))
1832 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1833 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1834 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1835 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1838 gnu_type = make_node (REAL_TYPE);
1839 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1840 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1841 TYPE_GCC_MIN_VALUE (gnu_type)
1842 = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type));
1843 TYPE_GCC_MAX_VALUE (gnu_type)
1844 = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type));
1845 layout_type (gnu_type);
1847 SET_TYPE_RM_MIN_VALUE
1849 convert (TREE_TYPE (gnu_type),
1850 elaborate_expression (Type_Low_Bound (gnat_entity),
1851 gnat_entity, get_identifier ("L"),
1853 Needs_Debug_Info (gnat_entity))));
1855 SET_TYPE_RM_MAX_VALUE
1857 convert (TREE_TYPE (gnu_type),
1858 elaborate_expression (Type_High_Bound (gnat_entity),
1859 gnat_entity, get_identifier ("U"),
1861 Needs_Debug_Info (gnat_entity))));
1863 /* One of the above calls might have caused us to be elaborated,
1864 so don't blow up if so. */
1865 if (present_gnu_tree (gnat_entity))
1867 maybe_present = true;
1871 /* Inherit our alias set from what we're a subtype of, as for
1872 integer subtypes. */
1873 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1877 /* Array and String Types and Subtypes
1879 Unconstrained array types are represented by E_Array_Type and
1880 constrained array types are represented by E_Array_Subtype. There
1881 are no actual objects of an unconstrained array type; all we have
1882 are pointers to that type.
1884 The following fields are defined on array types and subtypes:
1886 Component_Type Component type of the array.
1887 Number_Dimensions Number of dimensions (an int).
1888 First_Index Type of first index. */
1893 Entity_Id gnat_index, gnat_name;
1894 const bool convention_fortran_p
1895 = (Convention (gnat_entity) == Convention_Fortran);
1896 const int ndim = Number_Dimensions (gnat_entity);
1897 tree gnu_template_fields = NULL_TREE;
1898 tree gnu_template_type = make_node (RECORD_TYPE);
1899 tree gnu_template_reference;
1900 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1901 tree gnu_fat_type = make_node (RECORD_TYPE);
1902 tree *gnu_index_types = XALLOCAVEC (tree, ndim);
1903 tree *gnu_temp_fields = XALLOCAVEC (tree, ndim);
1904 tree gnu_max_size = size_one_node, gnu_max_size_unit, tem;
1907 TYPE_NAME (gnu_template_type)
1908 = create_concat_name (gnat_entity, "XUB");
1910 /* Make a node for the array. If we are not defining the array
1911 suppress expanding incomplete types. */
1912 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1916 defer_incomplete_level++;
1917 this_deferred = true;
1920 /* Build the fat pointer type. Use a "void *" object instead of
1921 a pointer to the array type since we don't have the array type
1922 yet (it will reference the fat pointer via the bounds). */
1924 = create_field_decl (get_identifier ("P_ARRAY"), ptr_void_type_node,
1925 gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0);
1927 = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template,
1928 gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0);
1929 finish_fat_pointer_type (gnu_fat_type, tem);
1931 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1932 is the fat pointer. This will be used to access the individual
1933 fields once we build them. */
1934 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1935 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1936 DECL_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1937 gnu_template_reference
1938 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1939 TREE_READONLY (gnu_template_reference) = 1;
1941 /* Now create the GCC type for each index and add the fields for that
1942 index to the template. */
1943 for (index = (convention_fortran_p ? ndim - 1 : 0),
1944 gnat_index = First_Index (gnat_entity);
1945 0 <= index && index < ndim;
1946 index += (convention_fortran_p ? - 1 : 1),
1947 gnat_index = Next_Index (gnat_index))
1949 char field_name[16];
1950 tree gnu_index_base_type
1951 = get_unpadded_type (Base_Type (Etype (gnat_index)));
1952 tree gnu_lb_field, gnu_hb_field, gnu_orig_min, gnu_orig_max;
1953 tree gnu_min, gnu_max, gnu_high;
1955 /* Make the FIELD_DECLs for the low and high bounds of this
1956 type and then make extractions of these fields from the
1958 sprintf (field_name, "LB%d", index);
1959 gnu_lb_field = create_field_decl (get_identifier (field_name),
1960 gnu_index_base_type,
1961 gnu_template_type, NULL_TREE,
1963 Sloc_to_locus (Sloc (gnat_entity),
1964 &DECL_SOURCE_LOCATION (gnu_lb_field));
1966 field_name[0] = 'U';
1967 gnu_hb_field = create_field_decl (get_identifier (field_name),
1968 gnu_index_base_type,
1969 gnu_template_type, NULL_TREE,
1971 Sloc_to_locus (Sloc (gnat_entity),
1972 &DECL_SOURCE_LOCATION (gnu_hb_field));
1974 gnu_temp_fields[index] = chainon (gnu_lb_field, gnu_hb_field);
1976 /* We can't use build_component_ref here since the template type
1977 isn't complete yet. */
1978 gnu_orig_min = build3 (COMPONENT_REF, gnu_index_base_type,
1979 gnu_template_reference, gnu_lb_field,
1981 gnu_orig_max = build3 (COMPONENT_REF, gnu_index_base_type,
1982 gnu_template_reference, gnu_hb_field,
1984 TREE_READONLY (gnu_orig_min) = TREE_READONLY (gnu_orig_max) = 1;
1986 gnu_min = convert (sizetype, gnu_orig_min);
1987 gnu_max = convert (sizetype, gnu_orig_max);
1989 /* Compute the size of this dimension. See the E_Array_Subtype
1990 case below for the rationale. */
1992 = build3 (COND_EXPR, sizetype,
1993 build2 (GE_EXPR, boolean_type_node,
1994 gnu_orig_max, gnu_orig_min),
1996 size_binop (MINUS_EXPR, gnu_min, size_one_node));
1998 /* Make a range type with the new range in the Ada base type.
1999 Then make an index type with the size range in sizetype. */
2000 gnu_index_types[index]
2001 = create_index_type (gnu_min, gnu_high,
2002 create_range_type (gnu_index_base_type,
2007 /* Update the maximum size of the array in elements. */
2010 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
2012 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type));
2014 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type));
2016 = size_binop (MAX_EXPR,
2017 size_binop (PLUS_EXPR, size_one_node,
2018 size_binop (MINUS_EXPR,
2022 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2023 && TREE_OVERFLOW (gnu_this_max))
2024 gnu_max_size = NULL_TREE;
2027 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2030 TYPE_NAME (gnu_index_types[index])
2031 = create_concat_name (gnat_entity, field_name);
2034 for (index = 0; index < ndim; index++)
2036 = chainon (gnu_template_fields, gnu_temp_fields[index]);
2038 /* Install all the fields into the template. */
2039 finish_record_type (gnu_template_type, gnu_template_fields, 0,
2041 TYPE_READONLY (gnu_template_type) = 1;
2043 /* Now make the array of arrays and update the pointer to the array
2044 in the fat pointer. Note that it is the first field. */
2045 tem = gnat_to_gnu_component_type (gnat_entity, definition,
2048 /* If Component_Size is not already specified, annotate it with the
2049 size of the component. */
2050 if (Unknown_Component_Size (gnat_entity))
2051 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
2053 /* Compute the maximum size of the array in units and bits. */
2056 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2057 TYPE_SIZE_UNIT (tem));
2058 gnu_max_size = size_binop (MULT_EXPR,
2059 convert (bitsizetype, gnu_max_size),
2063 gnu_max_size_unit = NULL_TREE;
2065 /* Now build the array type. */
2066 for (index = ndim - 1; index >= 0; index--)
2068 tem = build_nonshared_array_type (tem, gnu_index_types[index]);
2069 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
2070 if (array_type_has_nonaliased_component (tem, gnat_entity))
2071 TYPE_NONALIASED_COMPONENT (tem) = 1;
2074 /* If an alignment is specified, use it if valid. But ignore it
2075 for the original type of packed array types. If the alignment
2076 was requested with an explicit alignment clause, state so. */
2077 if (No (Packed_Array_Type (gnat_entity))
2078 && Known_Alignment (gnat_entity))
2081 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2083 if (Present (Alignment_Clause (gnat_entity)))
2084 TYPE_USER_ALIGN (tem) = 1;
2087 TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p;
2088 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2090 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2091 corresponding fat pointer. */
2092 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2093 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2094 SET_TYPE_MODE (gnu_type, BLKmode);
2095 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2096 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2098 /* If the maximum size doesn't overflow, use it. */
2100 && TREE_CODE (gnu_max_size) == INTEGER_CST
2101 && !TREE_OVERFLOW (gnu_max_size)
2102 && TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2103 && !TREE_OVERFLOW (gnu_max_size_unit))
2105 TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size,
2107 TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit,
2108 TYPE_SIZE_UNIT (tem));
2111 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2112 tem, NULL, !Comes_From_Source (gnat_entity),
2113 debug_info_p, gnat_entity);
2115 /* Give the fat pointer type a name. If this is a packed type, tell
2116 the debugger how to interpret the underlying bits. */
2117 if (Present (Packed_Array_Type (gnat_entity)))
2118 gnat_name = Packed_Array_Type (gnat_entity);
2120 gnat_name = gnat_entity;
2121 create_type_decl (create_concat_name (gnat_name, "XUP"),
2122 gnu_fat_type, NULL, true,
2123 debug_info_p, gnat_entity);
2125 /* Create the type to be used as what a thin pointer designates:
2126 a record type for the object and its template with the fields
2127 shifted to have the template at a negative offset. */
2128 tem = build_unc_object_type (gnu_template_type, tem,
2129 create_concat_name (gnat_name, "XUT"),
2131 shift_unc_components_for_thin_pointers (tem);
2133 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2134 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2138 case E_String_Subtype:
2139 case E_Array_Subtype:
2141 /* This is the actual data type for array variables. Multidimensional
2142 arrays are implemented as arrays of arrays. Note that arrays which
2143 have sparse enumeration subtypes as index components create sparse
2144 arrays, which is obviously space inefficient but so much easier to
2147 Also note that the subtype never refers to the unconstrained array
2148 type, which is somewhat at variance with Ada semantics.
2150 First check to see if this is simply a renaming of the array type.
2151 If so, the result is the array type. */
2153 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2154 if (!Is_Constrained (gnat_entity))
2158 Entity_Id gnat_index, gnat_base_index;
2159 const bool convention_fortran_p
2160 = (Convention (gnat_entity) == Convention_Fortran);
2161 const int ndim = Number_Dimensions (gnat_entity);
2162 tree gnu_base_type = gnu_type;
2163 tree *gnu_index_types = XALLOCAVEC (tree, ndim);
2164 tree gnu_max_size = size_one_node, gnu_max_size_unit;
2165 bool need_index_type_struct = false;
2168 /* First create the GCC type for each index and find out whether
2169 special types are needed for debugging information. */
2170 for (index = (convention_fortran_p ? ndim - 1 : 0),
2171 gnat_index = First_Index (gnat_entity),
2173 = First_Index (Implementation_Base_Type (gnat_entity));
2174 0 <= index && index < ndim;
2175 index += (convention_fortran_p ? - 1 : 1),
2176 gnat_index = Next_Index (gnat_index),
2177 gnat_base_index = Next_Index (gnat_base_index))
2179 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
2180 tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type);
2181 tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type);
2182 tree gnu_min = convert (sizetype, gnu_orig_min);
2183 tree gnu_max = convert (sizetype, gnu_orig_max);
2184 tree gnu_base_index_type
2185 = get_unpadded_type (Etype (gnat_base_index));
2186 tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type);
2187 tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type);
2190 /* See if the base array type is already flat. If it is, we
2191 are probably compiling an ACATS test but it will cause the
2192 code below to malfunction if we don't handle it specially. */
2193 if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST
2194 && TREE_CODE (gnu_base_orig_max) == INTEGER_CST
2195 && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min))
2197 gnu_min = size_one_node;
2198 gnu_max = size_zero_node;
2202 /* Similarly, if one of the values overflows in sizetype and the
2203 range is null, use 1..0 for the sizetype bounds. */
2204 else if (TREE_CODE (gnu_min) == INTEGER_CST
2205 && TREE_CODE (gnu_max) == INTEGER_CST
2206 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2207 && tree_int_cst_lt (gnu_orig_max, gnu_orig_min))
2209 gnu_min = size_one_node;
2210 gnu_max = size_zero_node;
2214 /* If the minimum and maximum values both overflow in sizetype,
2215 but the difference in the original type does not overflow in
2216 sizetype, ignore the overflow indication. */
2217 else if (TREE_CODE (gnu_min) == INTEGER_CST
2218 && TREE_CODE (gnu_max) == INTEGER_CST
2219 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2222 fold_build2 (MINUS_EXPR, gnu_index_type,
2226 TREE_OVERFLOW (gnu_min) = 0;
2227 TREE_OVERFLOW (gnu_max) = 0;
2231 /* Compute the size of this dimension in the general case. We
2232 need to provide GCC with an upper bound to use but have to
2233 deal with the "superflat" case. There are three ways to do
2234 this. If we can prove that the array can never be superflat,
2235 we can just use the high bound of the index type. */
2236 else if ((Nkind (gnat_index) == N_Range
2237 && cannot_be_superflat_p (gnat_index))
2238 /* Packed Array Types are never superflat. */
2239 || Is_Packed_Array_Type (gnat_entity))
2242 /* Otherwise, if the high bound is constant but the low bound is
2243 not, we use the expression (hb >= lb) ? lb : hb + 1 for the
2244 lower bound. Note that the comparison must be done in the
2245 original type to avoid any overflow during the conversion. */
2246 else if (TREE_CODE (gnu_max) == INTEGER_CST
2247 && TREE_CODE (gnu_min) != INTEGER_CST)
2251 = build_cond_expr (sizetype,
2252 build_binary_op (GE_EXPR,
2257 size_binop (PLUS_EXPR, gnu_max,
2261 /* Finally we use (hb >= lb) ? hb : lb - 1 for the upper bound
2262 in all the other cases. Note that, here as well as above,
2263 the condition used in the comparison must be equivalent to
2264 the condition (length != 0). This is relied upon in order
2265 to optimize array comparisons in compare_arrays. */
2268 = build_cond_expr (sizetype,
2269 build_binary_op (GE_EXPR,
2274 size_binop (MINUS_EXPR, gnu_min,
2277 /* Reuse the index type for the range type. Then make an index
2278 type with the size range in sizetype. */
2279 gnu_index_types[index]
2280 = create_index_type (gnu_min, gnu_high, gnu_index_type,
2283 /* Update the maximum size of the array in elements. Here we
2284 see if any constraint on the index type of the base type
2285 can be used in the case of self-referential bound on the
2286 index type of the subtype. We look for a non-"infinite"
2287 and non-self-referential bound from any type involved and
2288 handle each bound separately. */
2291 tree gnu_base_min = convert (sizetype, gnu_base_orig_min);
2292 tree gnu_base_max = convert (sizetype, gnu_base_orig_max);
2293 tree gnu_base_index_base_type
2294 = get_base_type (gnu_base_index_type);
2295 tree gnu_base_base_min
2296 = convert (sizetype,
2297 TYPE_MIN_VALUE (gnu_base_index_base_type));
2298 tree gnu_base_base_max
2299 = convert (sizetype,
2300 TYPE_MAX_VALUE (gnu_base_index_base_type));
2302 if (!CONTAINS_PLACEHOLDER_P (gnu_min)
2303 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2304 && !TREE_OVERFLOW (gnu_base_min)))
2305 gnu_base_min = gnu_min;
2307 if (!CONTAINS_PLACEHOLDER_P (gnu_max)
2308 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2309 && !TREE_OVERFLOW (gnu_base_max)))
2310 gnu_base_max = gnu_max;
2312 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2313 && TREE_OVERFLOW (gnu_base_min))
2314 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2315 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2316 && TREE_OVERFLOW (gnu_base_max))
2317 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2318 gnu_max_size = NULL_TREE;
2322 = size_binop (MAX_EXPR,
2323 size_binop (PLUS_EXPR, size_one_node,
2324 size_binop (MINUS_EXPR,
2329 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2330 && TREE_OVERFLOW (gnu_this_max))
2331 gnu_max_size = NULL_TREE;
2334 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2338 /* We need special types for debugging information to point to
2339 the index types if they have variable bounds, are not integer
2340 types, are biased or are wider than sizetype. */
2341 if (!integer_onep (gnu_orig_min)
2342 || TREE_CODE (gnu_orig_max) != INTEGER_CST
2343 || TREE_CODE (gnu_index_type) != INTEGER_TYPE
2344 || (TREE_TYPE (gnu_index_type)
2345 && TREE_CODE (TREE_TYPE (gnu_index_type))
2347 || TYPE_BIASED_REPRESENTATION_P (gnu_index_type)
2348 || compare_tree_int (rm_size (gnu_index_type),
2349 TYPE_PRECISION (sizetype)) > 0)
2350 need_index_type_struct = true;
2353 /* Then flatten: create the array of arrays. For an array type
2354 used to implement a packed array, get the component type from
2355 the original array type since the representation clauses that
2356 can affect it are on the latter. */
2357 if (Is_Packed_Array_Type (gnat_entity)
2358 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2360 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2361 for (index = ndim - 1; index >= 0; index--)
2362 gnu_type = TREE_TYPE (gnu_type);
2364 /* One of the above calls might have caused us to be elaborated,
2365 so don't blow up if so. */
2366 if (present_gnu_tree (gnat_entity))
2368 maybe_present = true;
2374 gnu_type = gnat_to_gnu_component_type (gnat_entity, definition,
2377 /* One of the above calls might have caused us to be elaborated,
2378 so don't blow up if so. */
2379 if (present_gnu_tree (gnat_entity))
2381 maybe_present = true;
2386 /* Compute the maximum size of the array in units and bits. */
2389 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2390 TYPE_SIZE_UNIT (gnu_type));
2391 gnu_max_size = size_binop (MULT_EXPR,
2392 convert (bitsizetype, gnu_max_size),
2393 TYPE_SIZE (gnu_type));
2396 gnu_max_size_unit = NULL_TREE;
2398 /* Now build the array type. */
2399 for (index = ndim - 1; index >= 0; index --)
2401 gnu_type = build_nonshared_array_type (gnu_type,
2402 gnu_index_types[index]);
2403 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2404 if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
2405 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2408 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2409 TYPE_STUB_DECL (gnu_type)
2410 = create_type_stub_decl (gnu_entity_name, gnu_type);
2412 /* If we are at file level and this is a multi-dimensional array,
2413 we need to make a variable corresponding to the stride of the
2414 inner dimensions. */
2415 if (global_bindings_p () && ndim > 1)
2417 tree gnu_st_name = get_identifier ("ST");
2420 for (gnu_arr_type = TREE_TYPE (gnu_type);
2421 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2422 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2423 gnu_st_name = concat_name (gnu_st_name, "ST"))
2425 tree eltype = TREE_TYPE (gnu_arr_type);
2427 TYPE_SIZE (gnu_arr_type)
2428 = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type),
2429 gnat_entity, gnu_st_name,
2432 /* ??? For now, store the size as a multiple of the
2433 alignment of the element type in bytes so that we
2434 can see the alignment from the tree. */
2435 TYPE_SIZE_UNIT (gnu_arr_type)
2436 = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_arr_type),
2438 concat_name (gnu_st_name, "A_U"),
2440 TYPE_ALIGN (eltype));
2442 /* ??? create_type_decl is not invoked on the inner types so
2443 the MULT_EXPR node built above will never be marked. */
2444 MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type));
2448 /* If we need to write out a record type giving the names of the
2449 bounds for debugging purposes, do it now and make the record
2450 type a parallel type. This is not needed for a packed array
2451 since the bounds are conveyed by the original array type. */
2452 if (need_index_type_struct
2454 && !Is_Packed_Array_Type (gnat_entity))
2456 tree gnu_bound_rec = make_node (RECORD_TYPE);
2457 tree gnu_field_list = NULL_TREE;
2460 TYPE_NAME (gnu_bound_rec)
2461 = create_concat_name (gnat_entity, "XA");
2463 for (index = ndim - 1; index >= 0; index--)
2465 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]);
2466 tree gnu_index_name = TYPE_NAME (gnu_index);
2468 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2469 gnu_index_name = DECL_NAME (gnu_index_name);
2471 /* Make sure to reference the types themselves, and not just
2472 their names, as the debugger may fall back on them. */
2473 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2474 gnu_bound_rec, NULL_TREE,
2476 DECL_CHAIN (gnu_field) = gnu_field_list;
2477 gnu_field_list = gnu_field;
2480 finish_record_type (gnu_bound_rec, gnu_field_list, 0, true);
2481 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2484 /* Otherwise, for a packed array, make the original array type a
2486 else if (debug_info_p
2487 && Is_Packed_Array_Type (gnat_entity)
2488 && present_gnu_tree (Original_Array_Type (gnat_entity)))
2489 add_parallel_type (TYPE_STUB_DECL (gnu_type),
2491 (Original_Array_Type (gnat_entity)));
2493 TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p;
2494 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2495 = (Is_Packed_Array_Type (gnat_entity)
2496 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2498 /* If the size is self-referential and the maximum size doesn't
2499 overflow, use it. */
2500 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2502 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2503 && TREE_OVERFLOW (gnu_max_size))
2504 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2505 && TREE_OVERFLOW (gnu_max_size_unit)))
2507 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2508 TYPE_SIZE (gnu_type));
2509 TYPE_SIZE_UNIT (gnu_type)
2510 = size_binop (MIN_EXPR, gnu_max_size_unit,
2511 TYPE_SIZE_UNIT (gnu_type));
2514 /* Set our alias set to that of our base type. This gives all
2515 array subtypes the same alias set. */
2516 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2518 /* If this is a packed type, make this type the same as the packed
2519 array type, but do some adjusting in the type first. */
2520 if (Present (Packed_Array_Type (gnat_entity)))
2522 Entity_Id gnat_index;
2525 /* First finish the type we had been making so that we output
2526 debugging information for it. */
2527 if (Treat_As_Volatile (gnat_entity))
2529 = build_qualified_type (gnu_type,
2530 TYPE_QUALS (gnu_type)
2531 | TYPE_QUAL_VOLATILE);
2533 /* Make it artificial only if the base type was artificial too.
2534 That's sort of "morally" true and will make it possible for
2535 the debugger to look it up by name in DWARF, which is needed
2536 in order to decode the packed array type. */
2538 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2539 !Comes_From_Source (Etype (gnat_entity))
2540 && !Comes_From_Source (gnat_entity),
2541 debug_info_p, gnat_entity);
2543 /* Save it as our equivalent in case the call below elaborates
2545 save_gnu_tree (gnat_entity, gnu_decl, false);
2547 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2549 this_made_decl = true;
2550 gnu_type = TREE_TYPE (gnu_decl);
2551 save_gnu_tree (gnat_entity, NULL_TREE, false);
2553 gnu_inner = gnu_type;
2554 while (TREE_CODE (gnu_inner) == RECORD_TYPE
2555 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner)
2556 || TYPE_PADDING_P (gnu_inner)))
2557 gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner));
2559 /* We need to attach the index type to the type we just made so
2560 that the actual bounds can later be put into a template. */
2561 if ((TREE_CODE (gnu_inner) == ARRAY_TYPE
2562 && !TYPE_ACTUAL_BOUNDS (gnu_inner))
2563 || (TREE_CODE (gnu_inner) == INTEGER_TYPE
2564 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner)))
2566 if (TREE_CODE (gnu_inner) == INTEGER_TYPE)
2568 /* The TYPE_ACTUAL_BOUNDS field is overloaded with the
2569 TYPE_MODULUS for modular types so we make an extra
2570 subtype if necessary. */
2571 if (TYPE_MODULAR_P (gnu_inner))
2574 = make_unsigned_type (TYPE_PRECISION (gnu_inner));
2575 TREE_TYPE (gnu_subtype) = gnu_inner;
2576 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2577 SET_TYPE_RM_MIN_VALUE (gnu_subtype,
2578 TYPE_MIN_VALUE (gnu_inner));
2579 SET_TYPE_RM_MAX_VALUE (gnu_subtype,
2580 TYPE_MAX_VALUE (gnu_inner));
2581 gnu_inner = gnu_subtype;
2584 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1;
2586 #ifdef ENABLE_CHECKING
2587 /* Check for other cases of overloading. */
2588 gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner));
2592 for (gnat_index = First_Index (gnat_entity);
2593 Present (gnat_index);
2594 gnat_index = Next_Index (gnat_index))
2595 SET_TYPE_ACTUAL_BOUNDS
2597 tree_cons (NULL_TREE,
2598 get_unpadded_type (Etype (gnat_index)),
2599 TYPE_ACTUAL_BOUNDS (gnu_inner)));
2601 if (Convention (gnat_entity) != Convention_Fortran)
2602 SET_TYPE_ACTUAL_BOUNDS
2603 (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner)));
2605 if (TREE_CODE (gnu_type) == RECORD_TYPE
2606 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2607 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner;
2612 /* Abort if packed array with no Packed_Array_Type field set. */
2613 gcc_assert (!Is_Packed (gnat_entity));
2617 case E_String_Literal_Subtype:
2618 /* Create the type for a string literal. */
2620 Entity_Id gnat_full_type
2621 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2622 && Present (Full_View (Etype (gnat_entity)))
2623 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2624 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2625 tree gnu_string_array_type
2626 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2627 tree gnu_string_index_type
2628 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2629 (TYPE_DOMAIN (gnu_string_array_type))));
2630 tree gnu_lower_bound
2631 = convert (gnu_string_index_type,
2632 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2633 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2634 tree gnu_length = ssize_int (length - 1);
2635 tree gnu_upper_bound
2636 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2638 convert (gnu_string_index_type, gnu_length));
2640 = create_index_type (convert (sizetype, gnu_lower_bound),
2641 convert (sizetype, gnu_upper_bound),
2642 create_range_type (gnu_string_index_type,
2648 = build_nonshared_array_type (gnat_to_gnu_type
2649 (Component_Type (gnat_entity)),
2651 if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
2652 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2653 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2657 /* Record Types and Subtypes
2659 The following fields are defined on record types:
2661 Has_Discriminants True if the record has discriminants
2662 First_Discriminant Points to head of list of discriminants
2663 First_Entity Points to head of list of fields
2664 Is_Tagged_Type True if the record is tagged
2666 Implementation of Ada records and discriminated records:
2668 A record type definition is transformed into the equivalent of a C
2669 struct definition. The fields that are the discriminants which are
2670 found in the Full_Type_Declaration node and the elements of the
2671 Component_List found in the Record_Type_Definition node. The
2672 Component_List can be a recursive structure since each Variant of
2673 the Variant_Part of the Component_List has a Component_List.
2675 Processing of a record type definition comprises starting the list of
2676 field declarations here from the discriminants and the calling the
2677 function components_to_record to add the rest of the fields from the
2678 component list and return the gnu type node. The function
2679 components_to_record will call itself recursively as it traverses
2683 if (Has_Complex_Representation (gnat_entity))
2686 = build_complex_type
2688 (Etype (Defining_Entity
2689 (First (Component_Items
2692 (Declaration_Node (gnat_entity)))))))));
2698 Node_Id full_definition = Declaration_Node (gnat_entity);
2699 Node_Id record_definition = Type_Definition (full_definition);
2700 Entity_Id gnat_field;
2701 tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent;
2702 /* Set PACKED in keeping with gnat_to_gnu_field. */
2704 = Is_Packed (gnat_entity)
2706 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2708 : (Known_Alignment (gnat_entity)
2709 || (Strict_Alignment (gnat_entity)
2710 && Known_Static_Esize (gnat_entity)))
2713 bool has_discr = Has_Discriminants (gnat_entity);
2714 bool has_rep = Has_Specified_Layout (gnat_entity);
2715 bool all_rep = has_rep;
2717 = (Is_Tagged_Type (gnat_entity)
2718 && Nkind (record_definition) == N_Derived_Type_Definition);
2719 bool is_unchecked_union = Is_Unchecked_Union (gnat_entity);
2721 /* See if all fields have a rep clause. Stop when we find one
2724 for (gnat_field = First_Entity (gnat_entity);
2725 Present (gnat_field);
2726 gnat_field = Next_Entity (gnat_field))
2727 if ((Ekind (gnat_field) == E_Component
2728 || Ekind (gnat_field) == E_Discriminant)
2729 && No (Component_Clause (gnat_field)))
2735 /* If this is a record extension, go a level further to find the
2736 record definition. Also, verify we have a Parent_Subtype. */
2739 if (!type_annotate_only
2740 || Present (Record_Extension_Part (record_definition)))
2741 record_definition = Record_Extension_Part (record_definition);
2743 gcc_assert (type_annotate_only
2744 || Present (Parent_Subtype (gnat_entity)));
2747 /* Make a node for the record. If we are not defining the record,
2748 suppress expanding incomplete types. */
2749 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2750 TYPE_NAME (gnu_type) = gnu_entity_name;
2751 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2755 defer_incomplete_level++;
2756 this_deferred = true;
2759 /* If both a size and rep clause was specified, put the size in
2760 the record type now so that it can get the proper mode. */
2761 if (has_rep && Known_Esize (gnat_entity))
2762 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2764 /* Always set the alignment here so that it can be used to
2765 set the mode, if it is making the alignment stricter. If
2766 it is invalid, it will be checked again below. If this is to
2767 be Atomic, choose a default alignment of a word unless we know
2768 the size and it's smaller. */
2769 if (Known_Alignment (gnat_entity))
2770 TYPE_ALIGN (gnu_type)
2771 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2772 else if (Is_Atomic (gnat_entity))
2773 TYPE_ALIGN (gnu_type)
2774 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2775 /* If a type needs strict alignment, the minimum size will be the
2776 type size instead of the RM size (see validate_size). Cap the
2777 alignment, lest it causes this type size to become too large. */
2778 else if (Strict_Alignment (gnat_entity)
2779 && Known_Static_Esize (gnat_entity))
2781 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2782 unsigned int raw_align = raw_size & -raw_size;
2783 if (raw_align < BIGGEST_ALIGNMENT)
2784 TYPE_ALIGN (gnu_type) = raw_align;
2787 TYPE_ALIGN (gnu_type) = 0;
2789 /* If we have a Parent_Subtype, make a field for the parent. If
2790 this record has rep clauses, force the position to zero. */
2791 if (Present (Parent_Subtype (gnat_entity)))
2793 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2796 /* A major complexity here is that the parent subtype will
2797 reference our discriminants in its Discriminant_Constraint
2798 list. But those must reference the parent component of this
2799 record which is of the parent subtype we have not built yet!
2800 To break the circle we first build a dummy COMPONENT_REF which
2801 represents the "get to the parent" operation and initialize
2802 each of those discriminants to a COMPONENT_REF of the above
2803 dummy parent referencing the corresponding discriminant of the
2804 base type of the parent subtype. */
2805 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2806 build0 (PLACEHOLDER_EXPR, gnu_type),
2807 build_decl (input_location,
2808 FIELD_DECL, NULL_TREE,
2813 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2814 Present (gnat_field);
2815 gnat_field = Next_Stored_Discriminant (gnat_field))
2816 if (Present (Corresponding_Discriminant (gnat_field)))
2819 = gnat_to_gnu_field_decl (Corresponding_Discriminant
2823 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2824 gnu_get_parent, gnu_field, NULL_TREE),
2828 /* Then we build the parent subtype. If it has discriminants but
2829 the type itself has unknown discriminants, this means that it
2830 doesn't contain information about how the discriminants are
2831 derived from those of the ancestor type, so it cannot be used
2832 directly. Instead it is built by cloning the parent subtype
2833 of the underlying record view of the type, for which the above
2834 derivation of discriminants has been made explicit. */
2835 if (Has_Discriminants (gnat_parent)
2836 && Has_Unknown_Discriminants (gnat_entity))
2838 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2840 /* If we are defining the type, the underlying record
2841 view must already have been elaborated at this point.
2842 Otherwise do it now as its parent subtype cannot be
2843 technically elaborated on its own. */
2845 gcc_assert (present_gnu_tree (gnat_uview));
2847 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2849 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2851 /* Substitute the "get to the parent" of the type for that
2852 of its underlying record view in the cloned type. */
2853 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2854 Present (gnat_field);
2855 gnat_field = Next_Stored_Discriminant (gnat_field))
2856 if (Present (Corresponding_Discriminant (gnat_field)))
2858 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2860 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2861 gnu_get_parent, gnu_field, NULL_TREE);
2863 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2867 gnu_parent = gnat_to_gnu_type (gnat_parent);
2869 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2870 initially built. The discriminants must reference the fields
2871 of the parent subtype and not those of its base type for the
2872 placeholder machinery to properly work. */
2875 /* The actual parent subtype is the full view. */
2876 if (IN (Ekind (gnat_parent), Private_Kind))
2878 if (Present (Full_View (gnat_parent)))
2879 gnat_parent = Full_View (gnat_parent);
2881 gnat_parent = Underlying_Full_View (gnat_parent);
2884 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2885 Present (gnat_field);
2886 gnat_field = Next_Stored_Discriminant (gnat_field))
2887 if (Present (Corresponding_Discriminant (gnat_field)))
2889 Entity_Id field = Empty;
2890 for (field = First_Stored_Discriminant (gnat_parent);
2892 field = Next_Stored_Discriminant (field))
2893 if (same_discriminant_p (gnat_field, field))
2895 gcc_assert (Present (field));
2896 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2897 = gnat_to_gnu_field_decl (field);
2901 /* The "get to the parent" COMPONENT_REF must be given its
2903 TREE_TYPE (gnu_get_parent) = gnu_parent;
2905 /* ...and reference the _Parent field of this record. */
2907 = create_field_decl (parent_name_id,
2908 gnu_parent, gnu_type,
2910 ? TYPE_SIZE (gnu_parent) : NULL_TREE,
2912 ? bitsize_zero_node : NULL_TREE,
2914 DECL_INTERNAL_P (gnu_field) = 1;
2915 TREE_OPERAND (gnu_get_parent, 1) = gnu_field;
2916 TYPE_FIELDS (gnu_type) = gnu_field;
2919 /* Make the fields for the discriminants and put them into the record
2920 unless it's an Unchecked_Union. */
2922 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2923 Present (gnat_field);
2924 gnat_field = Next_Stored_Discriminant (gnat_field))
2926 /* If this is a record extension and this discriminant is the
2927 renaming of another discriminant, we've handled it above. */
2928 if (Present (Parent_Subtype (gnat_entity))
2929 && Present (Corresponding_Discriminant (gnat_field)))
2933 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition,
2936 /* Make an expression using a PLACEHOLDER_EXPR from the
2937 FIELD_DECL node just created and link that with the
2938 corresponding GNAT defining identifier. */
2939 save_gnu_tree (gnat_field,
2940 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2941 build0 (PLACEHOLDER_EXPR, gnu_type),
2942 gnu_field, NULL_TREE),
2945 if (!is_unchecked_union)
2947 DECL_CHAIN (gnu_field) = gnu_field_list;
2948 gnu_field_list = gnu_field;
2952 /* Add the fields into the record type and finish it up. */
2953 components_to_record (gnu_type, Component_List (record_definition),
2954 gnu_field_list, packed, definition, NULL,
2955 false, all_rep, is_unchecked_union,
2956 debug_info_p, false);
2958 /* If it is passed by reference, force BLKmode to ensure that objects
2959 of this type will always be put in memory. */
2960 if (Is_By_Reference_Type (gnat_entity))
2961 SET_TYPE_MODE (gnu_type, BLKmode);
2963 /* We used to remove the associations of the discriminants and _Parent
2964 for validity checking but we may need them if there's a Freeze_Node
2965 for a subtype used in this record. */
2966 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2968 /* Fill in locations of fields. */
2969 annotate_rep (gnat_entity, gnu_type);
2971 /* If there are any entities in the chain corresponding to components
2972 that we did not elaborate, ensure we elaborate their types if they
2974 for (gnat_temp = First_Entity (gnat_entity);
2975 Present (gnat_temp);
2976 gnat_temp = Next_Entity (gnat_temp))
2977 if ((Ekind (gnat_temp) == E_Component
2978 || Ekind (gnat_temp) == E_Discriminant)
2979 && Is_Itype (Etype (gnat_temp))
2980 && !present_gnu_tree (gnat_temp))
2981 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2983 /* If this is a record type associated with an exception definition,
2984 equate its fields to those of the standard exception type. This
2985 will make it possible to convert between them. */
2986 if (gnu_entity_name == exception_data_name_id)
2989 for (gnu_field = TYPE_FIELDS (gnu_type),
2990 gnu_std_field = TYPE_FIELDS (except_type_node);
2992 gnu_field = DECL_CHAIN (gnu_field),
2993 gnu_std_field = DECL_CHAIN (gnu_std_field))
2994 SET_DECL_ORIGINAL_FIELD_TO_FIELD (gnu_field, gnu_std_field);
2995 gcc_assert (!gnu_std_field);
3000 case E_Class_Wide_Subtype:
3001 /* If an equivalent type is present, that is what we should use.
3002 Otherwise, fall through to handle this like a record subtype
3003 since it may have constraints. */
3004 if (gnat_equiv_type != gnat_entity)
3006 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
3007 maybe_present = true;
3011 /* ... fall through ... */
3013 case E_Record_Subtype:
3014 /* If Cloned_Subtype is Present it means this record subtype has
3015 identical layout to that type or subtype and we should use
3016 that GCC type for this one. The front end guarantees that
3017 the component list is shared. */
3018 if (Present (Cloned_Subtype (gnat_entity)))
3020 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
3022 maybe_present = true;
3026 /* Otherwise, first ensure the base type is elaborated. Then, if we are
3027 changing the type, make a new type with each field having the type of
3028 the field in the new subtype but the position computed by transforming
3029 every discriminant reference according to the constraints. We don't
3030 see any difference between private and non-private type here since
3031 derivations from types should have been deferred until the completion
3032 of the private type. */
3035 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
3040 defer_incomplete_level++;
3041 this_deferred = true;
3044 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
3046 if (present_gnu_tree (gnat_entity))
3048 maybe_present = true;
3052 /* If this is a record subtype associated with a dispatch table,
3053 strip the suffix. This is necessary to make sure 2 different
3054 subtypes associated with the imported and exported views of a
3055 dispatch table are properly merged in LTO mode. */
3056 if (Is_Dispatch_Table_Entity (gnat_entity))
3059 Get_Encoded_Name (gnat_entity);
3060 p = strchr (Name_Buffer, '_');
3062 strcpy (p+2, "dtS");
3063 gnu_entity_name = get_identifier (Name_Buffer);
3066 /* When the subtype has discriminants and these discriminants affect
3067 the initial shape it has inherited, factor them in. But for an
3068 Unchecked_Union (it must be an Itype), just return the type.
3069 We can't just test Is_Constrained because private subtypes without
3070 discriminants of types with discriminants with default expressions
3071 are Is_Constrained but aren't constrained! */
3072 if (IN (Ekind (gnat_base_type), Record_Kind)
3073 && !Is_Unchecked_Union (gnat_base_type)
3074 && !Is_For_Access_Subtype (gnat_entity)
3075 && Is_Constrained (gnat_entity)
3076 && Has_Discriminants (gnat_entity)
3077 && Present (Discriminant_Constraint (gnat_entity))
3078 && Stored_Constraint (gnat_entity) != No_Elist)
3080 VEC(subst_pair,heap) *gnu_subst_list
3081 = build_subst_list (gnat_entity, gnat_base_type, definition);
3082 tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part, t;
3083 tree gnu_pos_list, gnu_field_list = NULL_TREE;
3084 bool selected_variant = false;
3085 Entity_Id gnat_field;
3086 VEC(variant_desc,heap) *gnu_variant_list;
3088 gnu_type = make_node (RECORD_TYPE);
3089 TYPE_NAME (gnu_type) = gnu_entity_name;
3091 /* Set the size, alignment and alias set of the new type to
3092 match that of the old one, doing required substitutions. */
3093 copy_and_substitute_in_size (gnu_type, gnu_base_type,
3096 if (TYPE_IS_PADDING_P (gnu_base_type))
3097 gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3099 gnu_unpad_base_type = gnu_base_type;
3101 /* Look for a REP part in the base type. */
3102 gnu_rep_part = get_rep_part (gnu_unpad_base_type);
3104 /* Look for a variant part in the base type. */
3105 gnu_variant_part = get_variant_part (gnu_unpad_base_type);
3107 /* If there is a variant part, we must compute whether the
3108 constraints statically select a particular variant. If
3109 so, we simply drop the qualified union and flatten the
3110 list of fields. Otherwise we'll build a new qualified
3111 union for the variants that are still relevant. */
3112 if (gnu_variant_part)
3118 = build_variant_list (TREE_TYPE (gnu_variant_part),
3119 gnu_subst_list, NULL);
3121 /* If all the qualifiers are unconditionally true, the
3122 innermost variant is statically selected. */
3123 selected_variant = true;
3124 FOR_EACH_VEC_ELT_REVERSE (variant_desc, gnu_variant_list,
3126 if (!integer_onep (v->qual))
3128 selected_variant = false;
3132 /* Otherwise, create the new variants. */
3133 if (!selected_variant)
3134 FOR_EACH_VEC_ELT_REVERSE (variant_desc, gnu_variant_list,
3137 tree old_variant = v->type;
3138 tree new_variant = make_node (RECORD_TYPE);
3139 TYPE_NAME (new_variant)
3140 = DECL_NAME (TYPE_NAME (old_variant));
3141 copy_and_substitute_in_size (new_variant, old_variant,
3143 v->record = new_variant;
3148 gnu_variant_list = NULL;
3149 selected_variant = false;
3153 = build_position_list (gnu_unpad_base_type,
3154 gnu_variant_list && !selected_variant,
3155 size_zero_node, bitsize_zero_node,
3156 BIGGEST_ALIGNMENT, NULL_TREE);
3158 for (gnat_field = First_Entity (gnat_entity);
3159 Present (gnat_field);
3160 gnat_field = Next_Entity (gnat_field))
3161 if ((Ekind (gnat_field) == E_Component
3162 || Ekind (gnat_field) == E_Discriminant)
3163 && !(Present (Corresponding_Discriminant (gnat_field))
3164 && Is_Tagged_Type (gnat_base_type))
3165 && Underlying_Type (Scope (Original_Record_Component
3169 Name_Id gnat_name = Chars (gnat_field);
3170 Entity_Id gnat_old_field
3171 = Original_Record_Component (gnat_field);
3173 = gnat_to_gnu_field_decl (gnat_old_field);
3174 tree gnu_context = DECL_CONTEXT (gnu_old_field);
3175 tree gnu_field, gnu_field_type, gnu_size;
3176 tree gnu_cont_type, gnu_last = NULL_TREE;
3178 /* If the type is the same, retrieve the GCC type from the
3179 old field to take into account possible adjustments. */
3180 if (Etype (gnat_field) == Etype (gnat_old_field))
3181 gnu_field_type = TREE_TYPE (gnu_old_field);
3183 gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
3185 /* If there was a component clause, the field types must be
3186 the same for the type and subtype, so copy the data from
3187 the old field to avoid recomputation here. Also if the
3188 field is justified modular and the optimization in
3189 gnat_to_gnu_field was applied. */
3190 if (Present (Component_Clause (gnat_old_field))
3191 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3192 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3193 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3194 == TREE_TYPE (gnu_old_field)))
3196 gnu_size = DECL_SIZE (gnu_old_field);
3197 gnu_field_type = TREE_TYPE (gnu_old_field);
3200 /* If the old field was packed and of constant size, we
3201 have to get the old size here, as it might differ from
3202 what the Etype conveys and the latter might overlap
3203 onto the following field. Try to arrange the type for
3204 possible better packing along the way. */
3205 else if (DECL_PACKED (gnu_old_field)
3206 && TREE_CODE (DECL_SIZE (gnu_old_field))
3209 gnu_size = DECL_SIZE (gnu_old_field);
3210 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3211 && !TYPE_FAT_POINTER_P (gnu_field_type)
3212 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3214 = make_packable_type (gnu_field_type, true);
3218 gnu_size = TYPE_SIZE (gnu_field_type);
3220 /* If the context of the old field is the base type or its
3221 REP part (if any), put the field directly in the new
3222 type; otherwise look up the context in the variant list
3223 and put the field either in the new type if there is a
3224 selected variant or in one of the new variants. */
3225 if (gnu_context == gnu_unpad_base_type
3227 && gnu_context == TREE_TYPE (gnu_rep_part)))
3228 gnu_cont_type = gnu_type;
3235 FOR_EACH_VEC_ELT_REVERSE (variant_desc,
3236 gnu_variant_list, ix, v)
3237 if (v->type == gnu_context)
3244 if (selected_variant)
3245 gnu_cont_type = gnu_type;
3247 gnu_cont_type = v->record;
3250 /* The front-end may pass us "ghost" components if
3251 it fails to recognize that a constrained subtype
3252 is statically constrained. Discard them. */
3256 /* Now create the new field modeled on the old one. */
3258 = create_field_decl_from (gnu_old_field, gnu_field_type,
3259 gnu_cont_type, gnu_size,
3260 gnu_pos_list, gnu_subst_list);
3262 /* Put it in one of the new variants directly. */
3263 if (gnu_cont_type != gnu_type)
3265 DECL_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type);
3266 TYPE_FIELDS (gnu_cont_type) = gnu_field;
3269 /* To match the layout crafted in components_to_record,
3270 if this is the _Tag or _Parent field, put it before
3271 any other fields. */
3272 else if (gnat_name == Name_uTag
3273 || gnat_name == Name_uParent)
3274 gnu_field_list = chainon (gnu_field_list, gnu_field);
3276 /* Similarly, if this is the _Controller field, put
3277 it before the other fields except for the _Tag or
3279 else if (gnat_name == Name_uController && gnu_last)
3281 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
3282 TREE_CHAIN (gnu_last) = gnu_field;
3285 /* Otherwise, if this is a regular field, put it after
3286 the other fields. */
3289 DECL_CHAIN (gnu_field) = gnu_field_list;
3290 gnu_field_list = gnu_field;
3292 gnu_last = gnu_field;
3295 save_gnu_tree (gnat_field, gnu_field, false);
3298 /* If there is a variant list and no selected variant, we need
3299 to create the nest of variant parts from the old nest. */
3300 if (gnu_variant_list && !selected_variant)
3302 tree new_variant_part
3303 = create_variant_part_from (gnu_variant_part,
3304 gnu_variant_list, gnu_type,
3305 gnu_pos_list, gnu_subst_list);
3306 DECL_CHAIN (new_variant_part) = gnu_field_list;
3307 gnu_field_list = new_variant_part;
3310 /* Now go through the entities again looking for Itypes that
3311 we have not elaborated but should (e.g., Etypes of fields
3312 that have Original_Components). */
3313 for (gnat_field = First_Entity (gnat_entity);
3314 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3315 if ((Ekind (gnat_field) == E_Discriminant
3316 || Ekind (gnat_field) == E_Component)
3317 && !present_gnu_tree (Etype (gnat_field)))
3318 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3320 /* Do not emit debug info for the type yet since we're going to
3322 gnu_field_list = nreverse (gnu_field_list);
3323 finish_record_type (gnu_type, gnu_field_list, 2, false);
3325 /* See the E_Record_Type case for the rationale. */
3326 if (Is_By_Reference_Type (gnat_entity))
3327 SET_TYPE_MODE (gnu_type, BLKmode);
3329 compute_record_mode (gnu_type);
3331 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3333 /* Fill in locations of fields. */
3334 annotate_rep (gnat_entity, gnu_type);
3336 /* If debugging information is being written for the type, write
3337 a record that shows what we are a subtype of and also make a
3338 variable that indicates our size, if still variable. */
3341 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3342 tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type);
3343 tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type);
3345 if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL)
3346 gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name);
3348 TYPE_NAME (gnu_subtype_marker)
3349 = create_concat_name (gnat_entity, "XVS");
3350 finish_record_type (gnu_subtype_marker,
3351 create_field_decl (gnu_unpad_base_name,
3352 build_reference_type
3353 (gnu_unpad_base_type),
3355 NULL_TREE, NULL_TREE,
3359 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3360 gnu_subtype_marker);
3363 && TREE_CODE (gnu_size_unit) != INTEGER_CST
3364 && !CONTAINS_PLACEHOLDER_P (gnu_size_unit))
3365 TYPE_SIZE_UNIT (gnu_subtype_marker)
3366 = create_var_decl (create_concat_name (gnat_entity,
3368 NULL_TREE, sizetype, gnu_size_unit,
3369 false, false, false, false, NULL,
3373 VEC_free (variant_desc, heap, gnu_variant_list);
3374 VEC_free (subst_pair, heap, gnu_subst_list);
3376 /* Now we can finalize it. */
3377 rest_of_record_type_compilation (gnu_type);
3380 /* Otherwise, go down all the components in the new type and make
3381 them equivalent to those in the base type. */
3384 gnu_type = gnu_base_type;
3386 for (gnat_temp = First_Entity (gnat_entity);
3387 Present (gnat_temp);
3388 gnat_temp = Next_Entity (gnat_temp))
3389 if ((Ekind (gnat_temp) == E_Discriminant
3390 && !Is_Unchecked_Union (gnat_base_type))
3391 || Ekind (gnat_temp) == E_Component)
3392 save_gnu_tree (gnat_temp,
3393 gnat_to_gnu_field_decl
3394 (Original_Record_Component (gnat_temp)),
3400 case E_Access_Subprogram_Type:
3401 /* Use the special descriptor type for dispatch tables if needed,
3402 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3403 Note that we are only required to do so for static tables in
3404 order to be compatible with the C++ ABI, but Ada 2005 allows
3405 to extend library level tagged types at the local level so
3406 we do it in the non-static case as well. */
3407 if (TARGET_VTABLE_USES_DESCRIPTORS
3408 && Is_Dispatch_Table_Entity (gnat_entity))
3410 gnu_type = fdesc_type_node;
3411 gnu_size = TYPE_SIZE (gnu_type);
3415 /* ... fall through ... */
3417 case E_Anonymous_Access_Subprogram_Type:
3418 /* If we are not defining this entity, and we have incomplete
3419 entities being processed above us, make a dummy type and
3420 fill it in later. */
3421 if (!definition && defer_incomplete_level != 0)
3423 struct incomplete *p
3424 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3427 = build_pointer_type
3428 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3429 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3430 !Comes_From_Source (gnat_entity),
3431 debug_info_p, gnat_entity);
3432 this_made_decl = true;
3433 gnu_type = TREE_TYPE (gnu_decl);
3434 save_gnu_tree (gnat_entity, gnu_decl, false);
3437 p->old_type = TREE_TYPE (gnu_type);
3438 p->full_type = Directly_Designated_Type (gnat_entity);
3439 p->next = defer_incomplete_list;
3440 defer_incomplete_list = p;
3444 /* ... fall through ... */
3446 case E_Allocator_Type:
3448 case E_Access_Attribute_Type:
3449 case E_Anonymous_Access_Type:
3450 case E_General_Access_Type:
3452 /* The designated type and its equivalent type for gigi. */
3453 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3454 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3455 /* Whether it comes from a limited with. */
3456 bool is_from_limited_with
3457 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3458 && From_With_Type (gnat_desig_equiv));
3459 /* The "full view" of the designated type. If this is an incomplete
3460 entity from a limited with, treat its non-limited view as the full
3461 view. Otherwise, if this is an incomplete or private type, use the
3462 full view. In the former case, we might point to a private type,
3463 in which case, we need its full view. Also, we want to look at the
3464 actual type used for the representation, so this takes a total of
3466 Entity_Id gnat_desig_full_direct_first
3467 = (is_from_limited_with
3468 ? Non_Limited_View (gnat_desig_equiv)
3469 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3470 ? Full_View (gnat_desig_equiv) : Empty));
3471 Entity_Id gnat_desig_full_direct
3472 = ((is_from_limited_with
3473 && Present (gnat_desig_full_direct_first)
3474 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3475 ? Full_View (gnat_desig_full_direct_first)
3476 : gnat_desig_full_direct_first);
3477 Entity_Id gnat_desig_full
3478 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3479 /* The type actually used to represent the designated type, either
3480 gnat_desig_full or gnat_desig_equiv. */
3481 Entity_Id gnat_desig_rep;
3482 /* True if this is a pointer to an unconstrained array. */
3483 bool is_unconstrained_array;
3484 /* We want to know if we'll be seeing the freeze node for any
3485 incomplete type we may be pointing to. */
3487 = (Present (gnat_desig_full)
3488 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3489 : In_Extended_Main_Code_Unit (gnat_desig_type));
3490 /* True if we make a dummy type here. */
3491 bool made_dummy = false;
3492 /* True if the dummy type is a fat pointer. */
3493 bool got_fat_p = false;
3494 /* The mode to be used for the pointer type. */
3495 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3496 /* The GCC type used for the designated type. */
3497 tree gnu_desig_type = NULL_TREE;
3499 if (!targetm.valid_pointer_mode (p_mode))
3502 /* If either the designated type or its full view is an unconstrained
3503 array subtype, replace it with the type it's a subtype of. This
3504 avoids problems with multiple copies of unconstrained array types.
3505 Likewise, if the designated type is a subtype of an incomplete
3506 record type, use the parent type to avoid order of elaboration
3507 issues. This can lose some code efficiency, but there is no
3509 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3510 && !Is_Constrained (gnat_desig_equiv))
3511 gnat_desig_equiv = Etype (gnat_desig_equiv);
3512 if (Present (gnat_desig_full)
3513 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3514 && !Is_Constrained (gnat_desig_full))
3515 || (Ekind (gnat_desig_full) == E_Record_Subtype
3516 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3517 gnat_desig_full = Etype (gnat_desig_full);
3519 /* Set the type that's actually the representation of the designated
3520 type and also flag whether we have a unconstrained array. */
3522 = Present (gnat_desig_full) ? gnat_desig_full : gnat_desig_equiv;
3523 is_unconstrained_array
3524 = Is_Array_Type (gnat_desig_rep) && !Is_Constrained (gnat_desig_rep);
3526 /* If we are pointing to an incomplete type whose completion is an
3527 unconstrained array, make a fat pointer type. The two types in our
3528 fields will be pointers to dummy nodes and will be replaced in
3529 update_pointer_to. Similarly, if the type itself is a dummy type or
3530 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3531 in case we have any thin pointers to it. */
3532 if (is_unconstrained_array
3533 && (Present (gnat_desig_full)
3534 || (present_gnu_tree (gnat_desig_equiv)
3536 (TREE_TYPE (get_gnu_tree (gnat_desig_equiv))))
3538 && defer_incomplete_level != 0
3539 && !present_gnu_tree (gnat_desig_equiv))
3541 && is_from_limited_with
3542 && Present (Freeze_Node (gnat_desig_equiv)))))
3544 if (present_gnu_tree (gnat_desig_rep))
3545 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3548 gnu_desig_type = make_dummy_type (gnat_desig_rep);
3549 /* Show the dummy we get will be a fat pointer. */
3550 got_fat_p = made_dummy = true;
3553 /* If the call above got something that has a pointer, the pointer
3554 is our type. This could have happened either because the type
3555 was elaborated or because somebody else executed the code. */
3556 gnu_type = TYPE_POINTER_TO (gnu_desig_type);
3559 tree gnu_template_type = make_node (RECORD_TYPE);
3560 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3561 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3562 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3565 TYPE_NAME (gnu_template_type)
3566 = create_concat_name (gnat_desig_equiv, "XUB");
3567 TYPE_DUMMY_P (gnu_template_type) = 1;
3569 TYPE_NAME (gnu_array_type)
3570 = create_concat_name (gnat_desig_equiv, "XUA");
3571 TYPE_DUMMY_P (gnu_array_type) = 1;
3573 gnu_type = make_node (RECORD_TYPE);
3574 /* Build a stub DECL to trigger the special processing for fat
3575 pointer types in gnat_pushdecl. */
3576 TYPE_NAME (gnu_type)
3577 = create_type_stub_decl
3578 (create_concat_name (gnat_desig_equiv, "XUP"), gnu_type);
3579 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_desig_type);
3580 TYPE_POINTER_TO (gnu_desig_type) = gnu_type;
3583 = create_field_decl (get_identifier ("P_ARRAY"),
3584 gnu_ptr_array, gnu_type,
3585 NULL_TREE, NULL_TREE, 0, 0);
3587 = create_field_decl (get_identifier ("P_BOUNDS"),
3588 gnu_ptr_template, gnu_type,
3589 NULL_TREE, NULL_TREE, 0, 0);
3590 finish_fat_pointer_type (gnu_type, fields);
3592 TYPE_OBJECT_RECORD_TYPE (gnu_desig_type)
3593 = make_node (RECORD_TYPE);
3594 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_desig_type))
3595 = create_concat_name (gnat_desig_equiv, "XUT");
3596 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_desig_type)) = 1;
3600 /* If we already know what the full type is, use it. */
3601 else if (Present (gnat_desig_full)
3602 && present_gnu_tree (gnat_desig_full))
3603 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3605 /* Get the type of the thing we are to point to and build a pointer to
3606 it. If it is a reference to an incomplete or private type with a
3607 full view that is a record, make a dummy type node and get the
3608 actual type later when we have verified it is safe. */
3609 else if ((!in_main_unit
3610 && !present_gnu_tree (gnat_desig_equiv)
3611 && Present (gnat_desig_full)
3612 && !present_gnu_tree (gnat_desig_full)
3613 && Is_Record_Type (gnat_desig_full))
3614 /* Likewise if we are pointing to a record or array and we are
3615 to defer elaborating incomplete types. We do this as this
3616 access type may be the full view of a private type. Note
3617 that the unconstrained array case is handled above. */
3618 || ((!in_main_unit || imported_p)
3619 && defer_incomplete_level != 0
3620 && !present_gnu_tree (gnat_desig_equiv)
3621 && (Is_Record_Type (gnat_desig_rep)
3622 || Is_Array_Type (gnat_desig_rep)))
3623 /* If this is a reference from a limited_with type back to our
3624 main unit and there's a freeze node for it, either we have
3625 already processed the declaration and made the dummy type,
3626 in which case we just reuse the latter, or we have not yet,
3627 in which case we make the dummy type and it will be reused
3628 when the declaration is finally processed. In both cases,
3629 the pointer eventually created below will be automatically
3630 adjusted when the freeze node is processed. Note that the
3631 unconstrained array case is handled above. */
3633 && is_from_limited_with
3634 && Present (Freeze_Node (gnat_desig_rep))))
3636 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3640 /* Otherwise handle the case of a pointer to itself. */
3641 else if (gnat_desig_equiv == gnat_entity)
3644 = build_pointer_type_for_mode (void_type_node, p_mode,
3645 No_Strict_Aliasing (gnat_entity));
3646 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3649 /* If expansion is disabled, the equivalent type of a concurrent type
3650 is absent, so build a dummy pointer type. */
3651 else if (type_annotate_only && No (gnat_desig_equiv))
3652 gnu_type = ptr_void_type_node;
3654 /* Finally, handle the default case where we can just elaborate our
3657 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3659 /* It is possible that a call to gnat_to_gnu_type above resolved our
3660 type. If so, just return it. */
3661 if (present_gnu_tree (gnat_entity))
3663 maybe_present = true;
3667 /* If we have not done it yet, build the pointer type the usual way. */
3670 /* Modify the designated type if we are pointing only to constant
3671 objects, but don't do it for unconstrained arrays. */
3672 if (Is_Access_Constant (gnat_entity)
3673 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3676 = build_qualified_type
3678 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3680 /* Some extra processing is required if we are building a
3681 pointer to an incomplete type (in the GCC sense). We might
3682 have such a type if we just made a dummy, or directly out
3683 of the call to gnat_to_gnu_type above if we are processing
3684 an access type for a record component designating the
3685 record type itself. */
3686 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3688 /* We must ensure that the pointer to variant we make will
3689 be processed by update_pointer_to when the initial type
3690 is completed. Pretend we made a dummy and let further
3691 processing act as usual. */
3694 /* We must ensure that update_pointer_to will not retrieve
3695 the dummy variant when building a properly qualified
3696 version of the complete type. We take advantage of the
3697 fact that get_qualified_type is requiring TYPE_NAMEs to
3698 match to influence build_qualified_type and then also
3699 update_pointer_to here. */
3700 TYPE_NAME (gnu_desig_type)
3701 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3706 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3707 No_Strict_Aliasing (gnat_entity));
3710 /* If we are not defining this object and we have made a dummy pointer,
3711 save our current definition, evaluate the actual type, and replace
3712 the tentative type we made with the actual one. If we are to defer
3713 actually looking up the actual type, make an entry in the deferred
3714 list. If this is from a limited with, we have to defer to the end
3715 of the current spec in two cases: first if the designated type is
3716 in the current unit and second if the access type itself is. */
3717 if ((!in_main_unit || is_from_limited_with) && made_dummy)
3719 bool is_from_limited_with_in_main_unit
3720 = (is_from_limited_with
3722 || In_Extended_Main_Code_Unit (gnat_entity)));
3723 tree gnu_old_desig_type
3724 = TYPE_IS_FAT_POINTER_P (gnu_type)
3725 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3727 if (esize == POINTER_SIZE
3728 && (got_fat_p || TYPE_IS_FAT_POINTER_P (gnu_type)))
3730 = build_pointer_type
3731 (TYPE_OBJECT_RECORD_TYPE
3732 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3734 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3735 !Comes_From_Source (gnat_entity),
3736 debug_info_p, gnat_entity);
3737 this_made_decl = true;
3738 gnu_type = TREE_TYPE (gnu_decl);
3739 save_gnu_tree (gnat_entity, gnu_decl, false);
3742 /* Note that the call to gnat_to_gnu_type on gnat_desig_equiv might
3743 update gnu_old_desig_type directly, in which case it will not be
3744 a dummy type any more when we get into update_pointer_to.
3746 This can happen e.g. when the designated type is a record type,
3747 because their elaboration starts with an initial node from
3748 make_dummy_type, which may be the same node as the one we got.
3750 Besides, variants of this non-dummy type might have been created
3751 along the way. update_pointer_to is expected to properly take
3752 care of those situations. */
3753 if (defer_incomplete_level == 0
3754 && !is_from_limited_with_in_main_unit)
3755 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_desig_type),
3756 gnat_to_gnu_type (gnat_desig_equiv));
3759 struct incomplete *p = XNEW (struct incomplete);
3760 struct incomplete **head
3761 = (is_from_limited_with_in_main_unit
3762 ? &defer_limited_with : &defer_incomplete_list);
3763 p->old_type = gnu_old_desig_type;
3764 p->full_type = gnat_desig_equiv;
3772 case E_Access_Protected_Subprogram_Type:
3773 case E_Anonymous_Access_Protected_Subprogram_Type:
3774 if (type_annotate_only && No (gnat_equiv_type))
3775 gnu_type = ptr_void_type_node;
3778 /* The run-time representation is the equivalent type. */
3779 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3780 maybe_present = true;
3783 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3784 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3785 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3786 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3787 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3792 case E_Access_Subtype:
3794 /* We treat this as identical to its base type; any constraint is
3795 meaningful only to the front end.
3797 The designated type must be elaborated as well, if it does
3798 not have its own freeze node. Designated (sub)types created
3799 for constrained components of records with discriminants are
3800 not frozen by the front end and thus not elaborated by gigi,
3801 because their use may appear before the base type is frozen,
3802 and because it is not clear that they are needed anywhere in
3803 Gigi. With the current model, there is no correct place where
3804 they could be elaborated. */
3806 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3807 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3808 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3809 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3810 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3812 /* If we are not defining this entity, and we have incomplete
3813 entities being processed above us, make a dummy type and
3814 elaborate it later. */
3815 if (!definition && defer_incomplete_level != 0)
3817 struct incomplete *p
3818 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3820 = build_pointer_type
3821 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3823 p->old_type = TREE_TYPE (gnu_ptr_type);
3824 p->full_type = Directly_Designated_Type (gnat_entity);
3825 p->next = defer_incomplete_list;
3826 defer_incomplete_list = p;
3828 else if (!IN (Ekind (Base_Type
3829 (Directly_Designated_Type (gnat_entity))),
3830 Incomplete_Or_Private_Kind))
3831 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3835 maybe_present = true;
3838 /* Subprogram Entities
3840 The following access functions are defined for subprograms:
3842 Etype Return type or Standard_Void_Type.
3843 First_Formal The first formal parameter.
3844 Is_Imported Indicates that the subprogram has appeared in
3845 an INTERFACE or IMPORT pragma. For now we
3846 assume that the external language is C.
3847 Is_Exported Likewise but for an EXPORT pragma.
3848 Is_Inlined True if the subprogram is to be inlined.
3850 Each parameter is first checked by calling must_pass_by_ref on its
3851 type to determine if it is passed by reference. For parameters which
3852 are copied in, if they are Ada In Out or Out parameters, their return
3853 value becomes part of a record which becomes the return type of the
3854 function (C function - note that this applies only to Ada procedures
3855 so there is no Ada return type). Additional code to store back the
3856 parameters will be generated on the caller side. This transformation
3857 is done here, not in the front-end.
3859 The intended result of the transformation can be seen from the
3860 equivalent source rewritings that follow:
3862 struct temp {int a,b};
3863 procedure P (A,B: In Out ...) is temp P (int A,B)
3866 end P; return {A,B};
3873 For subprogram types we need to perform mainly the same conversions to
3874 GCC form that are needed for procedures and function declarations. The
3875 only difference is that at the end, we make a type declaration instead
3876 of a function declaration. */
3878 case E_Subprogram_Type:
3882 /* The type returned by a function or else Standard_Void_Type for a
3884 Entity_Id gnat_return_type = Etype (gnat_entity);
3885 tree gnu_return_type;
3886 /* The first GCC parameter declaration (a PARM_DECL node). The
3887 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3888 actually is the head of this parameter list. */
3889 tree gnu_param_list = NULL_TREE;
3890 /* Likewise for the stub associated with an exported procedure. */
3891 tree gnu_stub_param_list = NULL_TREE;
3892 /* Non-null for subprograms containing parameters passed by copy-in
3893 copy-out (Ada In Out or Out parameters not passed by reference),
3894 in which case it is the list of nodes used to specify the values
3895 of the In Out/Out parameters that are returned as a record upon
3896 procedure return. The TREE_PURPOSE of an element of this list is
3897 a field of the record and the TREE_VALUE is the PARM_DECL
3898 corresponding to that field. This list will be saved in the
3899 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3900 tree gnu_cico_list = NULL_TREE;
3901 /* List of fields in return type of procedure with copy-in copy-out
3903 tree gnu_field_list = NULL_TREE;
3904 /* If an import pragma asks to map this subprogram to a GCC builtin,
3905 this is the builtin DECL node. */
3906 tree gnu_builtin_decl = NULL_TREE;
3907 /* For the stub associated with an exported procedure. */
3908 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3909 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3910 Entity_Id gnat_param;
3911 bool inline_flag = Is_Inlined (gnat_entity);
3912 bool public_flag = Is_Public (gnat_entity) || imported_p;
3914 = (Is_Public (gnat_entity) && !definition) || imported_p;
3915 /* The semantics of "pure" in Ada essentially matches that of "const"
3916 in the back-end. In particular, both properties are orthogonal to
3917 the "nothrow" property if the EH circuitry is explicit in the
3918 internal representation of the back-end. If we are to completely
3919 hide the EH circuitry from it, we need to declare that calls to pure
3920 Ada subprograms that can throw have side effects since they can
3921 trigger an "abnormal" transfer of control flow; thus they can be
3922 neither "const" nor "pure" in the back-end sense. */
3924 = (Exception_Mechanism == Back_End_Exceptions
3925 && Is_Pure (gnat_entity));
3926 bool volatile_flag = No_Return (gnat_entity);
3927 bool return_by_direct_ref_p = false;
3928 bool return_by_invisi_ref_p = false;
3929 bool return_unconstrained_p = false;
3930 bool has_stub = false;
3933 /* A parameter may refer to this type, so defer completion of any
3934 incomplete types. */
3935 if (kind == E_Subprogram_Type && !definition)
3937 defer_incomplete_level++;
3938 this_deferred = true;
3941 /* If the subprogram has an alias, it is probably inherited, so
3942 we can use the original one. If the original "subprogram"
3943 is actually an enumeration literal, it may be the first use
3944 of its type, so we must elaborate that type now. */
3945 if (Present (Alias (gnat_entity)))
3947 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3948 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3950 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity), gnu_expr, 0);
3952 /* Elaborate any Itypes in the parameters of this entity. */
3953 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3954 Present (gnat_temp);
3955 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3956 if (Is_Itype (Etype (gnat_temp)))
3957 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3962 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3963 corresponding DECL node. Proper generation of calls later on need
3964 proper parameter associations so we don't "break;" here. */
3965 if (Convention (gnat_entity) == Convention_Intrinsic
3966 && Present (Interface_Name (gnat_entity)))
3968 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3970 /* Inability to find the builtin decl most often indicates a
3971 genuine mistake, but imports of unregistered intrinsics are
3972 sometimes issued on purpose to allow hooking in alternate
3973 bodies. We post a warning conditioned on Wshadow in this case,
3974 to let developers be notified on demand without risking false
3975 positives with common default sets of options. */
3977 if (gnu_builtin_decl == NULL_TREE && warn_shadow)
3978 post_error ("?gcc intrinsic not found for&!", gnat_entity);
3981 /* ??? What if we don't find the builtin node above ? warn ? err ?
3982 In the current state we neither warn nor err, and calls will just
3983 be handled as for regular subprograms. */
3985 /* Look into the return type and get its associated GCC tree. If it
3986 is not void, compute various flags for the subprogram type. */
3987 if (Ekind (gnat_return_type) == E_Void)
3988 gnu_return_type = void_type_node;
3991 gnu_return_type = gnat_to_gnu_type (gnat_return_type);
3993 /* If this function returns by reference, make the actual return
3994 type the pointer type and make a note of that. */
3995 if (Returns_By_Ref (gnat_entity))
3997 gnu_return_type = build_pointer_type (gnu_return_type);
3998 return_by_direct_ref_p = true;
4001 /* If we are supposed to return an unconstrained array type, make
4002 the actual return type the fat pointer type. */
4003 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
4005 gnu_return_type = TREE_TYPE (gnu_return_type);
4006 return_unconstrained_p = true;
4009 /* Likewise, if the return type requires a transient scope, the
4010 return value will be allocated on the secondary stack so the
4011 actual return type is the pointer type. */
4012 else if (Requires_Transient_Scope (gnat_return_type))
4014 gnu_return_type = build_pointer_type (gnu_return_type);
4015 return_unconstrained_p = true;
4018 /* If the Mechanism is By_Reference, ensure this function uses the
4019 target's by-invisible-reference mechanism, which may not be the
4020 same as above (e.g. it might be passing an extra parameter). */
4021 else if (kind == E_Function
4022 && Mechanism (gnat_entity) == By_Reference)
4023 return_by_invisi_ref_p = true;
4025 /* Likewise, if the return type is itself By_Reference. */
4026 else if (TREE_ADDRESSABLE (gnu_return_type))
4027 return_by_invisi_ref_p = true;
4029 /* If the type is a padded type and the underlying type would not
4030 be passed by reference or the function has a foreign convention,
4031 return the underlying type. */
4032 else if (TYPE_IS_PADDING_P (gnu_return_type)
4033 && (!default_pass_by_ref
4034 (TREE_TYPE (TYPE_FIELDS (gnu_return_type)))
4035 || Has_Foreign_Convention (gnat_entity)))
4036 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
4038 /* If the return type is unconstrained, that means it must have a
4039 maximum size. Use the padded type as the effective return type.
4040 And ensure the function uses the target's by-invisible-reference
4041 mechanism to avoid copying too much data when it returns. */
4042 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type)))
4045 = maybe_pad_type (gnu_return_type,
4046 max_size (TYPE_SIZE (gnu_return_type),
4048 0, gnat_entity, false, false, false, true);
4049 return_by_invisi_ref_p = true;
4052 /* If the return type has a size that overflows, we cannot have
4053 a function that returns that type. This usage doesn't make
4054 sense anyway, so give an error here. */
4055 if (TYPE_SIZE_UNIT (gnu_return_type)
4056 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
4057 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
4059 post_error ("cannot return type whose size overflows",
4061 gnu_return_type = copy_node (gnu_return_type);
4062 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
4063 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
4064 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
4065 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
4069 /* Loop over the parameters and get their associated GCC tree. While
4070 doing this, build a copy-in copy-out structure if we need one. */
4071 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
4072 Present (gnat_param);
4073 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
4075 tree gnu_param_name = get_entity_name (gnat_param);
4076 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4077 tree gnu_param, gnu_field;
4078 bool copy_in_copy_out = false;
4079 Mechanism_Type mech = Mechanism (gnat_param);
4081 /* Builtins are expanded inline and there is no real call sequence
4082 involved. So the type expected by the underlying expander is
4083 always the type of each argument "as is". */
4084 if (gnu_builtin_decl)
4086 /* Handle the first parameter of a valued procedure specially. */
4087 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
4088 mech = By_Copy_Return;
4089 /* Otherwise, see if a Mechanism was supplied that forced this
4090 parameter to be passed one way or another. */
4091 else if (mech == Default
4092 || mech == By_Copy || mech == By_Reference)
4094 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4095 mech = By_Descriptor;
4097 else if (By_Short_Descriptor_Last <= mech &&
4098 mech <= By_Short_Descriptor)
4099 mech = By_Short_Descriptor;
4103 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4104 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4105 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4107 mech = By_Reference;
4113 post_error ("unsupported mechanism for&", gnat_param);
4118 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4119 Has_Foreign_Convention (gnat_entity),
4122 /* We are returned either a PARM_DECL or a type if no parameter
4123 needs to be passed; in either case, adjust the type. */
4124 if (DECL_P (gnu_param))
4125 gnu_param_type = TREE_TYPE (gnu_param);
4128 gnu_param_type = gnu_param;
4129 gnu_param = NULL_TREE;
4132 /* The failure of this assertion will very likely come from an
4133 order of elaboration issue for the type of the parameter. */
4134 gcc_assert (kind == E_Subprogram_Type
4135 || !TYPE_IS_DUMMY_P (gnu_param_type));
4139 /* If it's an exported subprogram, we build a parameter list
4140 in parallel, in case we need to emit a stub for it. */
4141 if (Is_Exported (gnat_entity))
4144 = chainon (gnu_param, gnu_stub_param_list);
4145 /* Change By_Descriptor parameter to By_Reference for
4146 the internal version of an exported subprogram. */
4147 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4150 = gnat_to_gnu_param (gnat_param, By_Reference,
4156 gnu_param = copy_node (gnu_param);
4159 gnu_param_list = chainon (gnu_param, gnu_param_list);
4160 Sloc_to_locus (Sloc (gnat_param),
4161 &DECL_SOURCE_LOCATION (gnu_param));
4162 save_gnu_tree (gnat_param, gnu_param, false);
4164 /* If a parameter is a pointer, this function may modify
4165 memory through it and thus shouldn't be considered
4166 a const function. Also, the memory may be modified
4167 between two calls, so they can't be CSE'ed. The latter
4168 case also handles by-ref parameters. */
4169 if (POINTER_TYPE_P (gnu_param_type)
4170 || TYPE_IS_FAT_POINTER_P (gnu_param_type))
4174 if (copy_in_copy_out)
4178 tree gnu_new_ret_type = make_node (RECORD_TYPE);
4180 /* If this is a function, we also need a field for the
4181 return value to be placed. */
4182 if (TREE_CODE (gnu_return_type) != VOID_TYPE)
4185 = create_field_decl (get_identifier ("RETVAL"),
4187 gnu_new_ret_type, NULL_TREE,
4189 Sloc_to_locus (Sloc (gnat_entity),
4190 &DECL_SOURCE_LOCATION (gnu_field));
4191 gnu_field_list = gnu_field;
4193 = tree_cons (gnu_field, void_type_node, NULL_TREE);
4196 gnu_return_type = gnu_new_ret_type;
4197 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4198 /* Set a default alignment to speed up accesses. */
4199 TYPE_ALIGN (gnu_return_type)
4200 = get_mode_alignment (ptr_mode);
4204 = create_field_decl (gnu_param_name, gnu_param_type,
4205 gnu_return_type, NULL_TREE, NULL_TREE,
4207 Sloc_to_locus (Sloc (gnat_param),
4208 &DECL_SOURCE_LOCATION (gnu_field));
4209 DECL_CHAIN (gnu_field) = gnu_field_list;
4210 gnu_field_list = gnu_field;
4212 = tree_cons (gnu_field, gnu_param, gnu_cico_list);
4216 /* Do not compute record for out parameters if subprogram is
4217 stubbed since structures are incomplete for the back-end. */
4218 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4219 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4222 /* If we have a CICO list but it has only one entry, we convert
4223 this function into a function that simply returns that one
4225 if (list_length (gnu_cico_list) == 1)
4226 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list));
4228 if (Has_Stdcall_Convention (gnat_entity))
4229 prepend_one_attribute_to
4230 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4231 get_identifier ("stdcall"), NULL_TREE,
4234 /* If we should request stack realignment for a foreign convention
4235 subprogram, do so. Note that this applies to task entry points in
4237 if (FOREIGN_FORCE_REALIGN_STACK
4238 && Has_Foreign_Convention (gnat_entity))
4239 prepend_one_attribute_to
4240 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4241 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4244 /* The lists have been built in reverse. */
4245 gnu_param_list = nreverse (gnu_param_list);
4247 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4248 gnu_cico_list = nreverse (gnu_cico_list);
4250 if (kind == E_Function)
4251 Set_Mechanism (gnat_entity, return_unconstrained_p
4252 || return_by_direct_ref_p
4253 || return_by_invisi_ref_p
4254 ? By_Reference : By_Copy);
4256 = create_subprog_type (gnu_return_type, gnu_param_list,
4257 gnu_cico_list, return_unconstrained_p,
4258 return_by_direct_ref_p,
4259 return_by_invisi_ref_p);
4263 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4264 gnu_cico_list, return_unconstrained_p,
4265 return_by_direct_ref_p,
4266 return_by_invisi_ref_p);
4268 /* A subprogram (something that doesn't return anything) shouldn't
4269 be considered const since there would be no reason for such a
4270 subprogram. Note that procedures with Out (or In Out) parameters
4271 have already been converted into a function with a return type. */
4272 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4276 = build_qualified_type (gnu_type,
4277 TYPE_QUALS (gnu_type)
4278 | (TYPE_QUAL_CONST * const_flag)
4279 | (TYPE_QUAL_VOLATILE * volatile_flag));
4283 = build_qualified_type (gnu_stub_type,
4284 TYPE_QUALS (gnu_stub_type)
4285 | (TYPE_QUAL_CONST * const_flag)
4286 | (TYPE_QUAL_VOLATILE * volatile_flag));
4288 /* If we have a builtin decl for that function, use it. Check if the
4289 profiles are compatible and warn if they are not. The checker is
4290 expected to post extra diagnostics in this case. */
4291 if (gnu_builtin_decl)
4293 intrin_binding_t inb;
4295 inb.gnat_entity = gnat_entity;
4296 inb.ada_fntype = gnu_type;
4297 inb.btin_fntype = TREE_TYPE (gnu_builtin_decl);
4299 if (!intrin_profiles_compatible_p (&inb))
4301 ("?profile of& doesn''t match the builtin it binds!",
4304 gnu_decl = gnu_builtin_decl;
4305 gnu_type = TREE_TYPE (gnu_builtin_decl);
4309 /* If there was no specified Interface_Name and the external and
4310 internal names of the subprogram are the same, only use the
4311 internal name to allow disambiguation of nested subprograms. */
4312 if (No (Interface_Name (gnat_entity))
4313 && gnu_ext_name == gnu_entity_name)
4314 gnu_ext_name = NULL_TREE;
4316 /* If we are defining the subprogram and it has an Address clause
4317 we must get the address expression from the saved GCC tree for the
4318 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4319 the address expression here since the front-end has guaranteed
4320 in that case that the elaboration has no effects. If there is
4321 an Address clause and we are not defining the object, just
4322 make it a constant. */
4323 if (Present (Address_Clause (gnat_entity)))
4325 tree gnu_address = NULL_TREE;
4329 = (present_gnu_tree (gnat_entity)
4330 ? get_gnu_tree (gnat_entity)
4331 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4333 save_gnu_tree (gnat_entity, NULL_TREE, false);
4335 /* Convert the type of the object to a reference type that can
4336 alias everything as per 13.3(19). */
4338 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4340 gnu_address = convert (gnu_type, gnu_address);
4343 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4344 gnu_address, false, Is_Public (gnat_entity),
4345 extern_flag, false, NULL, gnat_entity);
4346 DECL_BY_REF_P (gnu_decl) = 1;
4349 else if (kind == E_Subprogram_Type)
4350 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4351 !Comes_From_Source (gnat_entity),
4352 debug_info_p, gnat_entity);
4357 gnu_stub_name = gnu_ext_name;
4358 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4359 public_flag = false;
4362 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4363 gnu_type, gnu_param_list,
4364 inline_flag, public_flag,
4365 extern_flag, attr_list,
4370 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4371 gnu_stub_type, gnu_stub_param_list,
4373 extern_flag, attr_list,
4375 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4378 /* This is unrelated to the stub built right above. */
4379 DECL_STUBBED_P (gnu_decl)
4380 = Convention (gnat_entity) == Convention_Stubbed;
4385 case E_Incomplete_Type:
4386 case E_Incomplete_Subtype:
4387 case E_Private_Type:
4388 case E_Private_Subtype:
4389 case E_Limited_Private_Type:
4390 case E_Limited_Private_Subtype:
4391 case E_Record_Type_With_Private:
4392 case E_Record_Subtype_With_Private:
4394 /* Get the "full view" of this entity. If this is an incomplete
4395 entity from a limited with, treat its non-limited view as the
4396 full view. Otherwise, use either the full view or the underlying
4397 full view, whichever is present. This is used in all the tests
4400 = (IN (kind, Incomplete_Kind) && From_With_Type (gnat_entity))
4401 ? Non_Limited_View (gnat_entity)
4402 : Present (Full_View (gnat_entity))
4403 ? Full_View (gnat_entity)
4404 : Underlying_Full_View (gnat_entity);
4406 /* If this is an incomplete type with no full view, it must be a Taft
4407 Amendment type, in which case we return a dummy type. Otherwise,
4408 just get the type from its Etype. */
4411 if (kind == E_Incomplete_Type)
4413 gnu_type = make_dummy_type (gnat_entity);
4414 gnu_decl = TYPE_STUB_DECL (gnu_type);
4418 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4420 maybe_present = true;
4425 /* If we already made a type for the full view, reuse it. */
4426 else if (present_gnu_tree (full_view))
4428 gnu_decl = get_gnu_tree (full_view);
4432 /* Otherwise, if we are not defining the type now, get the type
4433 from the full view. But always get the type from the full view
4434 for define on use types, since otherwise we won't see them! */
4435 else if (!definition
4436 || (Is_Itype (full_view)
4437 && No (Freeze_Node (gnat_entity)))
4438 || (Is_Itype (gnat_entity)
4439 && No (Freeze_Node (full_view))))
4441 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4442 maybe_present = true;
4446 /* For incomplete types, make a dummy type entry which will be
4447 replaced later. Save it as the full declaration's type so
4448 we can do any needed updates when we see it. */
4449 gnu_type = make_dummy_type (gnat_entity);
4450 gnu_decl = TYPE_STUB_DECL (gnu_type);
4451 save_gnu_tree (full_view, gnu_decl, 0);
4455 case E_Class_Wide_Type:
4456 /* Class-wide types are always transformed into their root type. */
4457 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4458 maybe_present = true;
4462 case E_Task_Subtype:
4463 case E_Protected_Type:
4464 case E_Protected_Subtype:
4465 /* Concurrent types are always transformed into their record type. */
4466 if (type_annotate_only && No (gnat_equiv_type))
4467 gnu_type = void_type_node;
4469 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4470 maybe_present = true;
4474 gnu_decl = create_label_decl (gnu_entity_name);
4479 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4480 we've already saved it, so we don't try to. */
4481 gnu_decl = error_mark_node;
4489 /* If we had a case where we evaluated another type and it might have
4490 defined this one, handle it here. */
4491 if (maybe_present && present_gnu_tree (gnat_entity))
4493 gnu_decl = get_gnu_tree (gnat_entity);
4497 /* If we are processing a type and there is either no decl for it or
4498 we just made one, do some common processing for the type, such as
4499 handling alignment and possible padding. */
4500 if (is_type && (!gnu_decl || this_made_decl))
4502 /* Tell the middle-end that objects of tagged types are guaranteed to
4503 be properly aligned. This is necessary because conversions to the
4504 class-wide type are translated into conversions to the root type,
4505 which can be less aligned than some of its derived types. */
4506 if (Is_Tagged_Type (gnat_entity)
4507 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4508 TYPE_ALIGN_OK (gnu_type) = 1;
4510 /* If the type is passed by reference, objects of this type must be
4511 fully addressable and cannot be copied. */
4512 if (Is_By_Reference_Type (gnat_entity))
4513 TREE_ADDRESSABLE (gnu_type) = 1;
4515 /* ??? Don't set the size for a String_Literal since it is either
4516 confirming or we don't handle it properly (if the low bound is
4518 if (!gnu_size && kind != E_String_Literal_Subtype)
4519 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4521 Has_Size_Clause (gnat_entity));
4523 /* If a size was specified, see if we can make a new type of that size
4524 by rearranging the type, for example from a fat to a thin pointer. */
4528 = make_type_from_size (gnu_type, gnu_size,
4529 Has_Biased_Representation (gnat_entity));
4531 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4532 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4536 /* If the alignment hasn't already been processed and this is
4537 not an unconstrained array, see if an alignment is specified.
4538 If not, we pick a default alignment for atomic objects. */
4539 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4541 else if (Known_Alignment (gnat_entity))
4543 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4544 TYPE_ALIGN (gnu_type));
4546 /* Warn on suspiciously large alignments. This should catch
4547 errors about the (alignment,byte)/(size,bit) discrepancy. */
4548 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4552 /* If a size was specified, take it into account. Otherwise
4553 use the RM size for records as the type size has already
4554 been adjusted to the alignment. */
4557 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4558 || TREE_CODE (gnu_type) == UNION_TYPE
4559 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4560 && !TYPE_FAT_POINTER_P (gnu_type))
4561 size = rm_size (gnu_type);
4563 size = TYPE_SIZE (gnu_type);
4565 /* Consider an alignment as suspicious if the alignment/size
4566 ratio is greater or equal to the byte/bit ratio. */
4567 if (host_integerp (size, 1)
4568 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4569 post_error_ne ("?suspiciously large alignment specified for&",
4570 Expression (Alignment_Clause (gnat_entity)),
4574 else if (Is_Atomic (gnat_entity) && !gnu_size
4575 && host_integerp (TYPE_SIZE (gnu_type), 1)
4576 && integer_pow2p (TYPE_SIZE (gnu_type)))
4577 align = MIN (BIGGEST_ALIGNMENT,
4578 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4579 else if (Is_Atomic (gnat_entity) && gnu_size
4580 && host_integerp (gnu_size, 1)
4581 && integer_pow2p (gnu_size))
4582 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4584 /* See if we need to pad the type. If we did, and made a record,
4585 the name of the new type may be changed. So get it back for
4586 us when we make the new TYPE_DECL below. */
4587 if (gnu_size || align > 0)
4588 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4589 false, !gnu_decl, definition, false);
4591 if (TYPE_IS_PADDING_P (gnu_type))
4593 gnu_entity_name = TYPE_NAME (gnu_type);
4594 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4595 gnu_entity_name = DECL_NAME (gnu_entity_name);
4598 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4600 /* If we are at global level, GCC will have applied variable_size to
4601 the type, but that won't have done anything. So, if it's not
4602 a constant or self-referential, call elaborate_expression_1 to
4603 make a variable for the size rather than calculating it each time.
4604 Handle both the RM size and the actual size. */
4605 if (global_bindings_p ()
4606 && TYPE_SIZE (gnu_type)
4607 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4608 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4610 tree size = TYPE_SIZE (gnu_type);
4612 TYPE_SIZE (gnu_type)
4613 = elaborate_expression_1 (size, gnat_entity,
4614 get_identifier ("SIZE"),
4617 /* ??? For now, store the size as a multiple of the alignment in
4618 bytes so that we can see the alignment from the tree. */
4619 TYPE_SIZE_UNIT (gnu_type)
4620 = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_type), gnat_entity,
4621 get_identifier ("SIZE_A_UNIT"),
4623 TYPE_ALIGN (gnu_type));
4625 /* ??? gnu_type may come from an existing type so the MULT_EXPR node
4626 may not be marked by the call to create_type_decl below. */
4627 MARK_VISITED (TYPE_SIZE_UNIT (gnu_type));
4629 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4631 tree variant_part = get_variant_part (gnu_type);
4632 tree ada_size = TYPE_ADA_SIZE (gnu_type);
4636 tree union_type = TREE_TYPE (variant_part);
4637 tree offset = DECL_FIELD_OFFSET (variant_part);
4639 /* If the position of the variant part is constant, subtract
4640 it from the size of the type of the parent to get the new
4641 size. This manual CSE reduces the data size. */
4642 if (TREE_CODE (offset) == INTEGER_CST)
4644 tree bitpos = DECL_FIELD_BIT_OFFSET (variant_part);
4645 TYPE_SIZE (union_type)
4646 = size_binop (MINUS_EXPR, TYPE_SIZE (gnu_type),
4647 bit_from_pos (offset, bitpos));
4648 TYPE_SIZE_UNIT (union_type)
4649 = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (gnu_type),
4650 byte_from_pos (offset, bitpos));
4654 TYPE_SIZE (union_type)
4655 = elaborate_expression_1 (TYPE_SIZE (union_type),
4657 get_identifier ("VSIZE"),
4660 /* ??? For now, store the size as a multiple of the
4661 alignment in bytes so that we can see the alignment
4663 TYPE_SIZE_UNIT (union_type)
4664 = elaborate_expression_2 (TYPE_SIZE_UNIT (union_type),
4669 TYPE_ALIGN (union_type));
4671 /* ??? For now, store the offset as a multiple of the
4672 alignment in bytes so that we can see the alignment
4674 DECL_FIELD_OFFSET (variant_part)
4675 = elaborate_expression_2 (offset,
4677 get_identifier ("VOFFSET"),
4683 DECL_SIZE (variant_part) = TYPE_SIZE (union_type);
4684 DECL_SIZE_UNIT (variant_part) = TYPE_SIZE_UNIT (union_type);
4687 if (operand_equal_p (ada_size, size, 0))
4688 ada_size = TYPE_SIZE (gnu_type);
4691 = elaborate_expression_1 (ada_size, gnat_entity,
4692 get_identifier ("RM_SIZE"),
4694 SET_TYPE_ADA_SIZE (gnu_type, ada_size);
4698 /* If this is a record type or subtype, call elaborate_expression_1 on
4699 any field position. Do this for both global and local types.
4700 Skip any fields that we haven't made trees for to avoid problems with
4701 class wide types. */
4702 if (IN (kind, Record_Kind))
4703 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4704 gnat_temp = Next_Entity (gnat_temp))
4705 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4707 tree gnu_field = get_gnu_tree (gnat_temp);
4709 /* ??? For now, store the offset as a multiple of the alignment
4710 in bytes so that we can see the alignment from the tree. */
4711 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4713 DECL_FIELD_OFFSET (gnu_field)
4714 = elaborate_expression_2 (DECL_FIELD_OFFSET (gnu_field),
4716 get_identifier ("OFFSET"),
4718 DECL_OFFSET_ALIGN (gnu_field));
4720 /* ??? The context of gnu_field is not necessarily gnu_type
4721 so the MULT_EXPR node built above may not be marked by
4722 the call to create_type_decl below. */
4723 if (global_bindings_p ())
4724 MARK_VISITED (DECL_FIELD_OFFSET (gnu_field));
4728 if (Treat_As_Volatile (gnat_entity))
4730 = build_qualified_type (gnu_type,
4731 TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
4733 if (Is_Atomic (gnat_entity))
4734 check_ok_for_atomic (gnu_type, gnat_entity, false);
4736 if (Present (Alignment_Clause (gnat_entity)))
4737 TYPE_USER_ALIGN (gnu_type) = 1;
4739 if (Universal_Aliasing (gnat_entity))
4740 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4743 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4744 !Comes_From_Source (gnat_entity),
4745 debug_info_p, gnat_entity);
4748 TREE_TYPE (gnu_decl) = gnu_type;
4749 TYPE_STUB_DECL (gnu_type) = gnu_decl;
4753 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4755 gnu_type = TREE_TYPE (gnu_decl);
4757 /* If this is a derived type, relate its alias set to that of its parent
4758 to avoid troubles when a call to an inherited primitive is inlined in
4759 a context where a derived object is accessed. The inlined code works
4760 on the parent view so the resulting code may access the same object
4761 using both the parent and the derived alias sets, which thus have to
4762 conflict. As the same issue arises with component references, the
4763 parent alias set also has to conflict with composite types enclosing
4764 derived components. For instance, if we have:
4771 we want T to conflict with both D and R, in addition to R being a
4772 superset of D by record/component construction.
4774 One way to achieve this is to perform an alias set copy from the
4775 parent to the derived type. This is not quite appropriate, though,
4776 as we don't want separate derived types to conflict with each other:
4778 type I1 is new Integer;
4779 type I2 is new Integer;
4781 We want I1 and I2 to both conflict with Integer but we do not want
4782 I1 to conflict with I2, and an alias set copy on derivation would
4785 The option chosen is to make the alias set of the derived type a
4786 superset of that of its parent type. It trivially fulfills the
4787 simple requirement for the Integer derivation example above, and
4788 the component case as well by superset transitivity:
4791 R ----------> D ----------> T
4793 However, for composite types, conversions between derived types are
4794 translated into VIEW_CONVERT_EXPRs so a sequence like:
4796 type Comp1 is new Comp;
4797 type Comp2 is new Comp;
4798 procedure Proc (C : Comp1);
4806 Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C));
4808 and gimplified into:
4815 i.e. generates code involving type punning. Therefore, Comp1 needs
4816 to conflict with Comp2 and an alias set copy is required.
4818 The language rules ensure the parent type is already frozen here. */
4819 if (Is_Derived_Type (gnat_entity))
4821 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4822 relate_alias_sets (gnu_type, gnu_parent_type,
4823 Is_Composite_Type (gnat_entity)
4824 ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET);
4827 /* Back-annotate the Alignment of the type if not already in the
4828 tree. Likewise for sizes. */
4829 if (Unknown_Alignment (gnat_entity))
4831 unsigned int double_align, align;
4832 bool is_capped_double, align_clause;
4834 /* If the default alignment of "double" or larger scalar types is
4835 specifically capped and this is not an array with an alignment
4836 clause on the component type, return the cap. */
4837 if ((double_align = double_float_alignment) > 0)
4839 = is_double_float_or_array (gnat_entity, &align_clause);
4840 else if ((double_align = double_scalar_alignment) > 0)
4842 = is_double_scalar_or_array (gnat_entity, &align_clause);
4844 is_capped_double = align_clause = false;
4846 if (is_capped_double && !align_clause)
4847 align = double_align;
4849 align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
4851 Set_Alignment (gnat_entity, UI_From_Int (align));
4854 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4856 tree gnu_size = TYPE_SIZE (gnu_type);
4858 /* If the size is self-referential, annotate the maximum value. */
4859 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4860 gnu_size = max_size (gnu_size, true);
4862 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4864 /* In this mode, the tag and the parent components are not
4865 generated by the front-end so the sizes must be adjusted. */
4866 tree pointer_size = bitsize_int (POINTER_SIZE), offset;
4869 if (Is_Derived_Type (gnat_entity))
4871 offset = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
4873 Set_Alignment (gnat_entity,
4874 Alignment (Etype (Base_Type (gnat_entity))));
4877 offset = pointer_size;
4879 gnu_size = size_binop (PLUS_EXPR, gnu_size, offset);
4880 gnu_size = size_binop (MULT_EXPR, pointer_size,
4881 size_binop (CEIL_DIV_EXPR,
4884 uint_size = annotate_value (gnu_size);
4885 Set_Esize (gnat_entity, uint_size);
4886 Set_RM_Size (gnat_entity, uint_size);
4889 Set_Esize (gnat_entity, annotate_value (gnu_size));
4892 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4893 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4896 /* If we really have a ..._DECL node, set a couple of flags on it. But we
4897 cannot do that if we are reusing the ..._DECL node made for a renamed
4898 object, since the predicates don't apply to it but to GNAT_ENTITY. */
4899 if (DECL_P (gnu_decl) && !(Present (Renamed_Object (gnat_entity)) && saved))
4901 if (!Comes_From_Source (gnat_entity))
4902 DECL_ARTIFICIAL (gnu_decl) = 1;
4904 if (!debug_info_p && TREE_CODE (gnu_decl) != FUNCTION_DECL)
4905 DECL_IGNORED_P (gnu_decl) = 1;
4908 /* If we haven't already, associate the ..._DECL node that we just made with
4909 the input GNAT entity node. */
4911 save_gnu_tree (gnat_entity, gnu_decl, false);
4913 /* If this is an enumeration or floating-point type, we were not able to set
4914 the bounds since they refer to the type. These are always static. */
4915 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4916 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4918 tree gnu_scalar_type = gnu_type;
4919 tree gnu_low_bound, gnu_high_bound;
4921 /* If this is a padded type, we need to use the underlying type. */
4922 if (TYPE_IS_PADDING_P (gnu_scalar_type))
4923 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4925 /* If this is a floating point type and we haven't set a floating
4926 point type yet, use this in the evaluation of the bounds. */
4927 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4928 longest_float_type_node = gnu_scalar_type;
4930 gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4931 gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity));
4933 if (kind == E_Enumeration_Type)
4935 /* Enumeration types have specific RM bounds. */
4936 SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound);
4937 SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound);
4939 /* Write full debugging information. Since this has both a
4940 typedef and a tag, avoid outputting the name twice. */
4941 DECL_ARTIFICIAL (gnu_decl) = 1;
4942 rest_of_type_decl_compilation (gnu_decl);
4947 /* Floating-point types don't have specific RM bounds. */
4948 TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound;
4949 TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound;
4953 /* If we deferred processing of incomplete types, re-enable it. If there
4954 were no other disables and we have some to process, do so. */
4955 if (this_deferred && --defer_incomplete_level == 0)
4957 if (defer_incomplete_list)
4959 struct incomplete *incp, *next;
4961 /* We are back to level 0 for the deferring of incomplete types.
4962 But processing these incomplete types below may itself require
4963 deferring, so preserve what we have and restart from scratch. */
4964 incp = defer_incomplete_list;
4965 defer_incomplete_list = NULL;
4967 /* For finalization, however, all types must be complete so we
4968 cannot do the same because deferred incomplete types may end up
4969 referencing each other. Process them all recursively first. */
4970 defer_finalize_level++;
4972 for (; incp; incp = next)
4977 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4978 gnat_to_gnu_type (incp->full_type));
4982 defer_finalize_level--;
4985 /* All the deferred incomplete types have been processed so we can
4986 now proceed with the finalization of the deferred types. */
4987 if (defer_finalize_level == 0 && defer_finalize_list)
4992 FOR_EACH_VEC_ELT (tree, defer_finalize_list, i, t)
4993 rest_of_type_decl_compilation_no_defer (t);
4995 VEC_free (tree, heap, defer_finalize_list);
4999 /* If we are not defining this type, see if it's in the incomplete list.
5000 If so, handle that list entry now. */
5001 else if (!definition)
5003 struct incomplete *incp;
5005 for (incp = defer_incomplete_list; incp; incp = incp->next)
5006 if (incp->old_type && incp->full_type == gnat_entity)
5008 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
5009 TREE_TYPE (gnu_decl));
5010 incp->old_type = NULL_TREE;
5017 /* If this is a packed array type whose original array type is itself
5018 an Itype without freeze node, make sure the latter is processed. */
5019 if (Is_Packed_Array_Type (gnat_entity)
5020 && Is_Itype (Original_Array_Type (gnat_entity))
5021 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
5022 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
5023 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
5028 /* Similar, but if the returned value is a COMPONENT_REF, return the
5032 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
5034 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
5036 if (TREE_CODE (gnu_field) == COMPONENT_REF)
5037 gnu_field = TREE_OPERAND (gnu_field, 1);
5042 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
5043 the GCC type corresponding to that entity. */
5046 gnat_to_gnu_type (Entity_Id gnat_entity)
5050 /* The back end never attempts to annotate generic types. */
5051 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
5052 return void_type_node;
5054 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
5055 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
5057 return TREE_TYPE (gnu_decl);
5060 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
5061 the unpadded version of the GCC type corresponding to that entity. */
5064 get_unpadded_type (Entity_Id gnat_entity)
5066 tree type = gnat_to_gnu_type (gnat_entity);
5068 if (TYPE_IS_PADDING_P (type))
5069 type = TREE_TYPE (TYPE_FIELDS (type));
5074 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
5075 Every TYPE_DECL generated for a type definition must be passed
5076 to this function once everything else has been done for it. */
5079 rest_of_type_decl_compilation (tree decl)
5081 /* We need to defer finalizing the type if incomplete types
5082 are being deferred or if they are being processed. */
5083 if (defer_incomplete_level != 0 || defer_finalize_level != 0)
5084 VEC_safe_push (tree, heap, defer_finalize_list, decl);
5086 rest_of_type_decl_compilation_no_defer (decl);
5089 /* Same as above but without deferring the compilation. This
5090 function should not be invoked directly on a TYPE_DECL. */
5093 rest_of_type_decl_compilation_no_defer (tree decl)
5095 const int toplev = global_bindings_p ();
5096 tree t = TREE_TYPE (decl);
5098 rest_of_decl_compilation (decl, toplev, 0);
5100 /* Now process all the variants. This is needed for STABS. */
5101 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
5103 if (t == TREE_TYPE (decl))
5106 if (!TYPE_STUB_DECL (t))
5107 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
5109 rest_of_type_compilation (t, toplev);
5113 /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST,
5114 finish constructing the record type as a fat pointer type. */
5117 finish_fat_pointer_type (tree record_type, tree field_list)
5119 /* Make sure we can put it into a register. */
5120 TYPE_ALIGN (record_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
5122 /* Show what it really is. */
5123 TYPE_FAT_POINTER_P (record_type) = 1;
5125 /* Do not emit debug info for it since the types of its fields may still be
5126 incomplete at this point. */
5127 finish_record_type (record_type, field_list, 0, false);
5129 /* Force type_contains_placeholder_p to return true on it. Although the
5130 PLACEHOLDER_EXPRs are referenced only indirectly, this isn't a pointer
5131 type but the representation of the unconstrained array. */
5132 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (record_type) = 2;
5135 /* Finalize any From_With_Type incomplete types. We do this after processing
5136 our compilation unit and after processing its spec, if this is a body. */
5139 finalize_from_with_types (void)
5141 struct incomplete *incp = defer_limited_with;
5142 struct incomplete *next;
5144 defer_limited_with = 0;
5145 for (; incp; incp = next)
5149 if (incp->old_type != 0)
5150 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
5151 gnat_to_gnu_type (incp->full_type));
5156 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
5157 kind of type (such E_Task_Type) that has a different type which Gigi
5158 uses for its representation. If the type does not have a special type
5159 for its representation, return GNAT_ENTITY. If a type is supposed to
5160 exist, but does not, abort unless annotating types, in which case
5161 return Empty. If GNAT_ENTITY is Empty, return Empty. */
5164 Gigi_Equivalent_Type (Entity_Id gnat_entity)
5166 Entity_Id gnat_equiv = gnat_entity;
5168 if (No (gnat_entity))
5171 switch (Ekind (gnat_entity))
5173 case E_Class_Wide_Subtype:
5174 if (Present (Equivalent_Type (gnat_entity)))
5175 gnat_equiv = Equivalent_Type (gnat_entity);
5178 case E_Access_Protected_Subprogram_Type:
5179 case E_Anonymous_Access_Protected_Subprogram_Type:
5180 gnat_equiv = Equivalent_Type (gnat_entity);
5183 case E_Class_Wide_Type:
5184 gnat_equiv = Root_Type (gnat_entity);
5188 case E_Task_Subtype:
5189 case E_Protected_Type:
5190 case E_Protected_Subtype:
5191 gnat_equiv = Corresponding_Record_Type (gnat_entity);
5198 gcc_assert (Present (gnat_equiv) || type_annotate_only);
5202 /* Return a GCC tree for a type corresponding to the component type of the
5203 array type or subtype GNAT_ARRAY. DEFINITION is true if this component
5204 is for an array being defined. DEBUG_INFO_P is true if we need to write
5205 debug information for other types that we may create in the process. */
5208 gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition,
5211 tree gnu_type = gnat_to_gnu_type (Component_Type (gnat_array));
5214 /* Try to get a smaller form of the component if needed. */
5215 if ((Is_Packed (gnat_array)
5216 || Has_Component_Size_Clause (gnat_array))
5217 && !Is_Bit_Packed_Array (gnat_array)
5218 && !Has_Aliased_Components (gnat_array)
5219 && !Strict_Alignment (Component_Type (gnat_array))
5220 && TREE_CODE (gnu_type) == RECORD_TYPE
5221 && !TYPE_FAT_POINTER_P (gnu_type)
5222 && host_integerp (TYPE_SIZE (gnu_type), 1))
5223 gnu_type = make_packable_type (gnu_type, false);
5225 if (Has_Atomic_Components (gnat_array))
5226 check_ok_for_atomic (gnu_type, gnat_array, true);
5228 /* Get and validate any specified Component_Size. */
5230 = validate_size (Component_Size (gnat_array), gnu_type, gnat_array,
5231 Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL,
5232 true, Has_Component_Size_Clause (gnat_array));
5234 /* If the array has aliased components and the component size can be zero,
5235 force at least unit size to ensure that the components have distinct
5238 && Has_Aliased_Components (gnat_array)
5239 && (integer_zerop (TYPE_SIZE (gnu_type))
5240 || (TREE_CODE (gnu_type) == ARRAY_TYPE
5241 && !TREE_CONSTANT (TYPE_SIZE (gnu_type)))))
5243 = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node);
5245 /* If the component type is a RECORD_TYPE that has a self-referential size,
5246 then use the maximum size for the component size. */
5248 && TREE_CODE (gnu_type) == RECORD_TYPE
5249 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
5250 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
5252 /* Honor the component size. This is not needed for bit-packed arrays. */
5253 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array))
5255 tree orig_type = gnu_type;
5256 unsigned int max_align;
5258 /* If an alignment is specified, use it as a cap on the component type
5259 so that it can be honored for the whole type. But ignore it for the
5260 original type of packed array types. */
5261 if (No (Packed_Array_Type (gnat_array)) && Known_Alignment (gnat_array))
5262 max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0);
5266 gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false);
5267 if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
5268 gnu_type = orig_type;
5270 orig_type = gnu_type;
5272 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array,
5273 true, false, definition, true);
5275 /* If a padding record was made, declare it now since it will never be
5276 declared otherwise. This is necessary to ensure that its subtrees
5277 are properly marked. */
5278 if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type)))
5279 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true,
5280 debug_info_p, gnat_array);
5283 if (Has_Volatile_Components (Base_Type (gnat_array)))
5285 = build_qualified_type (gnu_type,
5286 TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
5291 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
5292 using MECH as its passing mechanism, to be placed in the parameter
5293 list built for GNAT_SUBPROG. Assume a foreign convention for the
5294 latter if FOREIGN is true. Also set CICO to true if the parameter
5295 must use the copy-in copy-out implementation mechanism.
5297 The returned tree is a PARM_DECL, except for those cases where no
5298 parameter needs to be actually passed to the subprogram; the type
5299 of this "shadow" parameter is then returned instead. */
5302 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
5303 Entity_Id gnat_subprog, bool foreign, bool *cico)
5305 tree gnu_param_name = get_entity_name (gnat_param);
5306 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
5307 tree gnu_param_type_alt = NULL_TREE;
5308 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
5309 /* The parameter can be indirectly modified if its address is taken. */
5310 bool ro_param = in_param && !Address_Taken (gnat_param);
5311 bool by_return = false, by_component_ptr = false;
5312 bool by_ref = false, by_double_ref = false;
5315 /* Copy-return is used only for the first parameter of a valued procedure.
5316 It's a copy mechanism for which a parameter is never allocated. */
5317 if (mech == By_Copy_Return)
5319 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5324 /* If this is either a foreign function or if the underlying type won't
5325 be passed by reference, strip off possible padding type. */
5326 if (TYPE_IS_PADDING_P (gnu_param_type))
5328 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5330 if (mech == By_Reference
5332 || (!must_pass_by_ref (unpadded_type)
5333 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5334 gnu_param_type = unpadded_type;
5337 /* If this is a read-only parameter, make a variant of the type that is
5338 read-only. ??? However, if this is an unconstrained array, that type
5339 can be very complex, so skip it for now. Likewise for any other
5340 self-referential type. */
5342 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5343 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5344 gnu_param_type = build_qualified_type (gnu_param_type,
5345 (TYPE_QUALS (gnu_param_type)
5346 | TYPE_QUAL_CONST));
5348 /* For foreign conventions, pass arrays as pointers to the element type.
5349 First check for unconstrained array and get the underlying array. */
5350 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5352 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5354 /* For GCC builtins, pass Address integer types as (void *) */
5355 if (Convention (gnat_subprog) == Convention_Intrinsic
5356 && Present (Interface_Name (gnat_subprog))
5357 && Is_Descendent_Of_Address (Etype (gnat_param)))
5358 gnu_param_type = ptr_void_type_node;
5360 /* VMS descriptors are themselves passed by reference. */
5361 if (mech == By_Short_Descriptor ||
5362 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5364 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5365 Mechanism (gnat_param),
5367 else if (mech == By_Descriptor)
5369 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5370 chosen in fill_vms_descriptor. */
5372 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5373 Mechanism (gnat_param),
5376 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5377 Mechanism (gnat_param),
5381 /* Arrays are passed as pointers to element type for foreign conventions. */
5384 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5386 /* Strip off any multi-dimensional entries, then strip
5387 off the last array to get the component type. */
5388 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5389 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5390 gnu_param_type = TREE_TYPE (gnu_param_type);
5392 by_component_ptr = true;
5393 gnu_param_type = TREE_TYPE (gnu_param_type);
5396 gnu_param_type = build_qualified_type (gnu_param_type,
5397 (TYPE_QUALS (gnu_param_type)
5398 | TYPE_QUAL_CONST));
5400 gnu_param_type = build_pointer_type (gnu_param_type);
5403 /* Fat pointers are passed as thin pointers for foreign conventions. */
5404 else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type))
5406 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5408 /* If we must pass or were requested to pass by reference, do so.
5409 If we were requested to pass by copy, do so.
5410 Otherwise, for foreign conventions, pass In Out or Out parameters
5411 or aggregates by reference. For COBOL and Fortran, pass all
5412 integer and FP types that way too. For Convention Ada, use
5413 the standard Ada default. */
5414 else if (must_pass_by_ref (gnu_param_type)
5415 || mech == By_Reference
5418 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5420 && (Convention (gnat_subprog) == Convention_Fortran
5421 || Convention (gnat_subprog) == Convention_COBOL)
5422 && (INTEGRAL_TYPE_P (gnu_param_type)
5423 || FLOAT_TYPE_P (gnu_param_type)))
5425 && default_pass_by_ref (gnu_param_type)))))
5427 gnu_param_type = build_reference_type (gnu_param_type);
5430 /* In some ABIs, e.g. SPARC 32-bit, fat pointer types are themselves
5431 passed by reference. Pass them by explicit reference, this will
5432 generate more debuggable code at -O0. */
5433 if (TYPE_IS_FAT_POINTER_P (gnu_param_type)
5434 && targetm.calls.pass_by_reference (NULL,
5435 TYPE_MODE (gnu_param_type),
5439 gnu_param_type = build_reference_type (gnu_param_type);
5440 by_double_ref = true;
5444 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5448 if (mech == By_Copy && (by_ref || by_component_ptr))
5449 post_error ("?cannot pass & by copy", gnat_param);
5451 /* If this is an Out parameter that isn't passed by reference and isn't
5452 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5453 it will be a VAR_DECL created when we process the procedure, so just
5454 return its type. For the special parameter of a valued procedure,
5457 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5458 Out parameters with discriminants or implicit initial values to be
5459 handled like In Out parameters. These type are normally built as
5460 aggregates, hence passed by reference, except for some packed arrays
5461 which end up encoded in special integer types.
5463 The exception we need to make is then for packed arrays of records
5464 with discriminants or implicit initial values. We have no light/easy
5465 way to check for the latter case, so we merely check for packed arrays
5466 of records. This may lead to useless copy-in operations, but in very
5467 rare cases only, as these would be exceptions in a set of already
5468 exceptional situations. */
5469 if (Ekind (gnat_param) == E_Out_Parameter
5472 || (mech != By_Descriptor
5473 && mech != By_Short_Descriptor
5474 && !POINTER_TYPE_P (gnu_param_type)
5475 && !AGGREGATE_TYPE_P (gnu_param_type)))
5476 && !(Is_Array_Type (Etype (gnat_param))
5477 && Is_Packed (Etype (gnat_param))
5478 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5479 return gnu_param_type;
5481 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5482 ro_param || by_ref || by_component_ptr);
5483 DECL_BY_REF_P (gnu_param) = by_ref;
5484 DECL_BY_DOUBLE_REF_P (gnu_param) = by_double_ref;
5485 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5486 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5487 mech == By_Short_Descriptor);
5488 DECL_POINTS_TO_READONLY_P (gnu_param)
5489 = (ro_param && (by_ref || by_component_ptr));
5491 /* Save the alternate descriptor type, if any. */
5492 if (gnu_param_type_alt)
5493 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5495 /* If no Mechanism was specified, indicate what we're using, then
5496 back-annotate it. */
5497 if (mech == Default)
5498 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5500 Set_Mechanism (gnat_param, mech);
5504 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5507 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5509 while (Present (Corresponding_Discriminant (discr1)))
5510 discr1 = Corresponding_Discriminant (discr1);
5512 while (Present (Corresponding_Discriminant (discr2)))
5513 discr2 = Corresponding_Discriminant (discr2);
5516 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5519 /* Return true if the array type GNU_TYPE, which represents a dimension of
5520 GNAT_TYPE, has a non-aliased component in the back-end sense. */
5523 array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type)
5525 /* If the array type is not the innermost dimension of the GNAT type,
5526 then it has a non-aliased component. */
5527 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5528 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5531 /* If the array type has an aliased component in the front-end sense,
5532 then it also has an aliased component in the back-end sense. */
5533 if (Has_Aliased_Components (gnat_type))
5536 /* If this is a derived type, then it has a non-aliased component if
5537 and only if its parent type also has one. */
5538 if (Is_Derived_Type (gnat_type))
5540 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type));
5542 if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE)
5544 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type))));
5545 for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--)
5546 gnu_parent_type = TREE_TYPE (gnu_parent_type);
5547 return TYPE_NONALIASED_COMPONENT (gnu_parent_type);
5550 /* Otherwise, rely exclusively on properties of the element type. */
5551 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5554 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5557 compile_time_known_address_p (Node_Id gnat_address)
5559 /* Catch System'To_Address. */
5560 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5561 gnat_address = Expression (gnat_address);
5563 return Compile_Time_Known_Value (gnat_address);
5566 /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the
5567 inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */
5570 cannot_be_superflat_p (Node_Id gnat_range)
5572 Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range);
5573 Node_Id scalar_range;
5574 tree gnu_lb, gnu_hb, gnu_lb_minus_one;
5576 /* If the low bound is not constant, try to find an upper bound. */
5577 while (Nkind (gnat_lb) != N_Integer_Literal
5578 && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype
5579 || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype)
5580 && (scalar_range = Scalar_Range (Etype (gnat_lb)))
5581 && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
5582 || Nkind (scalar_range) == N_Range))
5583 gnat_lb = High_Bound (scalar_range);
5585 /* If the high bound is not constant, try to find a lower bound. */
5586 while (Nkind (gnat_hb) != N_Integer_Literal
5587 && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype
5588 || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype)
5589 && (scalar_range = Scalar_Range (Etype (gnat_hb)))
5590 && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
5591 || Nkind (scalar_range) == N_Range))
5592 gnat_hb = Low_Bound (scalar_range);
5594 /* If we have failed to find constant bounds, punt. */
5595 if (Nkind (gnat_lb) != N_Integer_Literal
5596 || Nkind (gnat_hb) != N_Integer_Literal)
5599 /* We need at least a signed 64-bit type to catch most cases. */
5600 gnu_lb = UI_To_gnu (Intval (gnat_lb), sbitsizetype);
5601 gnu_hb = UI_To_gnu (Intval (gnat_hb), sbitsizetype);
5602 if (TREE_OVERFLOW (gnu_lb) || TREE_OVERFLOW (gnu_hb))
5605 /* If the low bound is the smallest integer, nothing can be smaller. */
5606 gnu_lb_minus_one = size_binop (MINUS_EXPR, gnu_lb, sbitsize_one_node);
5607 if (TREE_OVERFLOW (gnu_lb_minus_one))
5610 return !tree_int_cst_lt (gnu_hb, gnu_lb_minus_one);
5613 /* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */
5616 constructor_address_p (tree gnu_expr)
5618 while (TREE_CODE (gnu_expr) == NOP_EXPR
5619 || TREE_CODE (gnu_expr) == CONVERT_EXPR
5620 || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR)
5621 gnu_expr = TREE_OPERAND (gnu_expr, 0);
5623 return (TREE_CODE (gnu_expr) == ADDR_EXPR
5624 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR);
5627 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5628 be elaborated at the point of its definition, but do nothing else. */
5631 elaborate_entity (Entity_Id gnat_entity)
5633 switch (Ekind (gnat_entity))
5635 case E_Signed_Integer_Subtype:
5636 case E_Modular_Integer_Subtype:
5637 case E_Enumeration_Subtype:
5638 case E_Ordinary_Fixed_Point_Subtype:
5639 case E_Decimal_Fixed_Point_Subtype:
5640 case E_Floating_Point_Subtype:
5642 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5643 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5645 /* ??? Tests to avoid Constraint_Error in static expressions
5646 are needed until after the front stops generating bogus
5647 conversions on bounds of real types. */
5648 if (!Raises_Constraint_Error (gnat_lb))
5649 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5650 true, false, Needs_Debug_Info (gnat_entity));
5651 if (!Raises_Constraint_Error (gnat_hb))
5652 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5653 true, false, Needs_Debug_Info (gnat_entity));
5659 Node_Id full_definition = Declaration_Node (gnat_entity);
5660 Node_Id record_definition = Type_Definition (full_definition);
5662 /* If this is a record extension, go a level further to find the
5663 record definition. */
5664 if (Nkind (record_definition) == N_Derived_Type_Definition)
5665 record_definition = Record_Extension_Part (record_definition);
5669 case E_Record_Subtype:
5670 case E_Private_Subtype:
5671 case E_Limited_Private_Subtype:
5672 case E_Record_Subtype_With_Private:
5673 if (Is_Constrained (gnat_entity)
5674 && Has_Discriminants (gnat_entity)
5675 && Present (Discriminant_Constraint (gnat_entity)))
5677 Node_Id gnat_discriminant_expr;
5678 Entity_Id gnat_field;
5681 = First_Discriminant (Implementation_Base_Type (gnat_entity)),
5682 gnat_discriminant_expr
5683 = First_Elmt (Discriminant_Constraint (gnat_entity));
5684 Present (gnat_field);
5685 gnat_field = Next_Discriminant (gnat_field),
5686 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5687 /* ??? For now, ignore access discriminants. */
5688 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5689 elaborate_expression (Node (gnat_discriminant_expr),
5690 gnat_entity, get_entity_name (gnat_field),
5691 true, false, false);
5698 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5699 any entities on its entity chain similarly. */
5702 mark_out_of_scope (Entity_Id gnat_entity)
5704 Entity_Id gnat_sub_entity;
5705 unsigned int kind = Ekind (gnat_entity);
5707 /* If this has an entity list, process all in the list. */
5708 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5709 || IN (kind, Private_Kind)
5710 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5711 || kind == E_Function || kind == E_Generic_Function
5712 || kind == E_Generic_Package || kind == E_Generic_Procedure
5713 || kind == E_Loop || kind == E_Operator || kind == E_Package
5714 || kind == E_Package_Body || kind == E_Procedure
5715 || kind == E_Record_Type || kind == E_Record_Subtype
5716 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5717 for (gnat_sub_entity = First_Entity (gnat_entity);
5718 Present (gnat_sub_entity);
5719 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5720 if (Scope (gnat_sub_entity) == gnat_entity
5721 && gnat_sub_entity != gnat_entity)
5722 mark_out_of_scope (gnat_sub_entity);
5724 /* Now clear this if it has been defined, but only do so if it isn't
5725 a subprogram or parameter. We could refine this, but it isn't
5726 worth it. If this is statically allocated, it is supposed to
5727 hang around out of cope. */
5728 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5729 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5731 save_gnu_tree (gnat_entity, NULL_TREE, true);
5732 save_gnu_tree (gnat_entity, error_mark_node, true);
5736 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5737 If this is a multi-dimensional array type, do this recursively.
5740 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5741 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5742 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5745 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5747 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5748 of a one-dimensional array, since the padding has the same alias set
5749 as the field type, but if it's a multi-dimensional array, we need to
5750 see the inner types. */
5751 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5752 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5753 || TYPE_PADDING_P (gnu_old_type)))
5754 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5756 /* Unconstrained array types are deemed incomplete and would thus be given
5757 alias set 0. Retrieve the underlying array type. */
5758 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5760 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5761 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5763 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5765 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5766 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5767 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5768 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5772 case ALIAS_SET_COPY:
5773 /* The alias set shouldn't be copied between array types with different
5774 aliasing settings because this can break the aliasing relationship
5775 between the array type and its element type. */
5776 #ifndef ENABLE_CHECKING
5777 if (flag_strict_aliasing)
5779 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5780 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5781 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5782 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5784 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5787 case ALIAS_SET_SUBSET:
5788 case ALIAS_SET_SUPERSET:
5790 alias_set_type old_set = get_alias_set (gnu_old_type);
5791 alias_set_type new_set = get_alias_set (gnu_new_type);
5793 /* Do nothing if the alias sets conflict. This ensures that we
5794 never call record_alias_subset several times for the same pair
5795 or at all for alias set 0. */
5796 if (!alias_sets_conflict_p (old_set, new_set))
5798 if (op == ALIAS_SET_SUBSET)
5799 record_alias_subset (old_set, new_set);
5801 record_alias_subset (new_set, old_set);
5810 record_component_aliases (gnu_new_type);
5813 /* Return true if the size represented by GNU_SIZE can be handled by an
5814 allocation. If STATIC_P is true, consider only what can be done with a
5815 static allocation. */
5818 allocatable_size_p (tree gnu_size, bool static_p)
5820 HOST_WIDE_INT our_size;
5822 /* If this is not a static allocation, the only case we want to forbid
5823 is an overflowing size. That will be converted into a raise a
5826 return !(TREE_CODE (gnu_size) == INTEGER_CST
5827 && TREE_OVERFLOW (gnu_size));
5829 /* Otherwise, we need to deal with both variable sizes and constant
5830 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5831 since assemblers may not like very large sizes. */
5832 if (!host_integerp (gnu_size, 1))
5835 our_size = tree_low_cst (gnu_size, 1);
5836 return (int) our_size == our_size;
5839 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5840 NAME, ARGS and ERROR_POINT. */
5843 prepend_one_attribute_to (struct attrib ** attr_list,
5844 enum attr_type attr_type,
5847 Node_Id attr_error_point)
5849 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5851 attr->type = attr_type;
5852 attr->name = attr_name;
5853 attr->args = attr_args;
5854 attr->error_point = attr_error_point;
5856 attr->next = *attr_list;
5860 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5863 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5867 /* Attributes are stored as Representation Item pragmas. */
5869 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5870 gnat_temp = Next_Rep_Item (gnat_temp))
5871 if (Nkind (gnat_temp) == N_Pragma)
5873 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5874 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5875 enum attr_type etype;
5877 /* Map the kind of pragma at hand. Skip if this is not one
5878 we know how to handle. */
5880 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5882 case Pragma_Machine_Attribute:
5883 etype = ATTR_MACHINE_ATTRIBUTE;
5886 case Pragma_Linker_Alias:
5887 etype = ATTR_LINK_ALIAS;
5890 case Pragma_Linker_Section:
5891 etype = ATTR_LINK_SECTION;
5894 case Pragma_Linker_Constructor:
5895 etype = ATTR_LINK_CONSTRUCTOR;
5898 case Pragma_Linker_Destructor:
5899 etype = ATTR_LINK_DESTRUCTOR;
5902 case Pragma_Weak_External:
5903 etype = ATTR_WEAK_EXTERNAL;
5906 case Pragma_Thread_Local_Storage:
5907 etype = ATTR_THREAD_LOCAL_STORAGE;
5914 /* See what arguments we have and turn them into GCC trees for
5915 attribute handlers. These expect identifier for strings. We
5916 handle at most two arguments, static expressions only. */
5918 if (Present (gnat_assoc) && Present (First (gnat_assoc)))
5920 Node_Id gnat_arg0 = Next (First (gnat_assoc));
5921 Node_Id gnat_arg1 = Empty;
5923 if (Present (gnat_arg0)
5924 && Is_Static_Expression (Expression (gnat_arg0)))
5926 gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0));
5928 if (TREE_CODE (gnu_arg0) == STRING_CST)
5929 gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0));
5931 gnat_arg1 = Next (gnat_arg0);
5934 if (Present (gnat_arg1)
5935 && Is_Static_Expression (Expression (gnat_arg1)))
5937 gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1));
5939 if (TREE_CODE (gnu_arg1) == STRING_CST)
5940 gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1));
5944 /* Prepend to the list now. Make a list of the argument we might
5945 have, as GCC expects it. */
5946 prepend_one_attribute_to
5949 (gnu_arg1 != NULL_TREE)
5950 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5951 Present (Next (First (gnat_assoc)))
5952 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5956 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5957 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5958 return the GCC tree to use for that expression. GNU_NAME is the suffix
5959 to use if a variable needs to be created and DEFINITION is true if this
5960 is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result;
5961 otherwise, we are just elaborating the expression for side-effects. If
5962 NEED_DEBUG is true, we need a variable for debugging purposes even if it
5963 isn't needed for code generation. */
5966 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name,
5967 bool definition, bool need_value, bool need_debug)
5971 /* If we already elaborated this expression (e.g. it was involved
5972 in the definition of a private type), use the old value. */
5973 if (present_gnu_tree (gnat_expr))
5974 return get_gnu_tree (gnat_expr);
5976 /* If we don't need a value and this is static or a discriminant,
5977 we don't need to do anything. */
5979 && (Is_OK_Static_Expression (gnat_expr)
5980 || (Nkind (gnat_expr) == N_Identifier
5981 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5984 /* If it's a static expression, we don't need a variable for debugging. */
5985 if (need_debug && Is_OK_Static_Expression (gnat_expr))
5988 /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */
5989 gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity,
5990 gnu_name, definition, need_debug);
5992 /* Save the expression in case we try to elaborate this entity again. Since
5993 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5994 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5995 save_gnu_tree (gnat_expr, gnu_expr, true);
5997 return need_value ? gnu_expr : error_mark_node;
6000 /* Similar, but take a GNU expression and always return a result. */
6003 elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
6004 bool definition, bool need_debug)
6006 const bool expr_global_p = Is_Public (gnat_entity) || global_bindings_p ();
6007 bool expr_variable_p;
6010 /* In most cases, we won't see a naked FIELD_DECL because a discriminant
6011 reference will have been replaced with a COMPONENT_REF when the type
6012 is being elaborated. However, there are some cases involving child
6013 types where we will. So convert it to a COMPONENT_REF. We hope it
6014 will be at the highest level of the expression in these cases. */
6015 if (TREE_CODE (gnu_expr) == FIELD_DECL)
6016 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
6017 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
6018 gnu_expr, NULL_TREE);
6020 /* If GNU_EXPR contains a placeholder, just return it. We rely on the fact
6021 that an expression cannot contain both a discriminant and a variable. */
6022 if (CONTAINS_PLACEHOLDER_P (gnu_expr))
6025 /* If GNU_EXPR is neither a constant nor based on a read-only variable, make
6026 a variable that is initialized to contain the expression when the package
6027 containing the definition is elaborated. If this entity is defined at top
6028 level, replace the expression by the variable; otherwise use a SAVE_EXPR
6029 if this is necessary. */
6030 if (CONSTANT_CLASS_P (gnu_expr))
6031 expr_variable_p = false;
6034 /* Skip any conversions and simple arithmetics to see if the expression
6035 is based on a read-only variable.
6036 ??? This really should remain read-only, but we have to think about
6037 the typing of the tree here. */
6039 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
6041 if (handled_component_p (inner))
6043 HOST_WIDE_INT bitsize, bitpos;
6045 enum machine_mode mode;
6046 int unsignedp, volatilep;
6048 inner = get_inner_reference (inner, &bitsize, &bitpos, &offset,
6049 &mode, &unsignedp, &volatilep, false);
6050 /* If the offset is variable, err on the side of caution. */
6057 && TREE_CODE (inner) == VAR_DECL
6058 && (TREE_READONLY (inner) || DECL_READONLY_ONCE_ELAB (inner)));
6061 /* Now create the variable if we need it. */
6062 if (need_debug || (expr_variable_p && expr_global_p))
6064 = create_var_decl (create_concat_name (gnat_entity,
6065 IDENTIFIER_POINTER (gnu_name)),
6066 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
6067 !need_debug, Is_Public (gnat_entity),
6068 !definition, expr_global_p, NULL, gnat_entity);
6070 /* We only need to use this variable if we are in global context since GCC
6071 can do the right thing in the local case. */
6072 if (expr_global_p && expr_variable_p)
6075 return expr_variable_p ? gnat_save_expr (gnu_expr) : gnu_expr;
6078 /* Similar, but take an alignment factor and make it explicit in the tree. */
6081 elaborate_expression_2 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
6082 bool definition, bool need_debug, unsigned int align)
6084 tree unit_align = size_int (align / BITS_PER_UNIT);
6086 size_binop (MULT_EXPR,
6087 elaborate_expression_1 (size_binop (EXACT_DIV_EXPR,
6090 gnat_entity, gnu_name, definition,
6095 /* Create a record type that contains a SIZE bytes long field of TYPE with a
6096 starting bit position so that it is aligned to ALIGN bits, and leaving at
6097 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
6098 record is guaranteed to get. */
6101 make_aligning_type (tree type, unsigned int align, tree size,
6102 unsigned int base_align, int room)
6104 /* We will be crafting a record type with one field at a position set to be
6105 the next multiple of ALIGN past record'address + room bytes. We use a
6106 record placeholder to express record'address. */
6107 tree record_type = make_node (RECORD_TYPE);
6108 tree record = build0 (PLACEHOLDER_EXPR, record_type);
6111 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
6113 /* The diagram below summarizes the shape of what we manipulate:
6115 <--------- pos ---------->
6116 { +------------+-------------+-----------------+
6117 record =>{ |############| ... | field (type) |
6118 { +------------+-------------+-----------------+
6119 |<-- room -->|<- voffset ->|<---- size ----->|
6122 record_addr vblock_addr
6124 Every length is in sizetype bytes there, except "pos" which has to be
6125 set as a bit position in the GCC tree for the record. */
6126 tree room_st = size_int (room);
6127 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
6128 tree voffset_st, pos, field;
6130 tree name = TYPE_NAME (type);
6132 if (TREE_CODE (name) == TYPE_DECL)
6133 name = DECL_NAME (name);
6134 name = concat_name (name, "ALIGN");
6135 TYPE_NAME (record_type) = name;
6137 /* Compute VOFFSET and then POS. The next byte position multiple of some
6138 alignment after some address is obtained by "and"ing the alignment minus
6139 1 with the two's complement of the address. */
6140 voffset_st = size_binop (BIT_AND_EXPR,
6141 fold_build1 (NEGATE_EXPR, sizetype, vblock_addr_st),
6142 size_int ((align / BITS_PER_UNIT) - 1));
6144 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
6145 pos = size_binop (MULT_EXPR,
6146 convert (bitsizetype,
6147 size_binop (PLUS_EXPR, room_st, voffset_st)),
6150 /* Craft the GCC record representation. We exceptionally do everything
6151 manually here because 1) our generic circuitry is not quite ready to
6152 handle the complex position/size expressions we are setting up, 2) we
6153 have a strong simplifying factor at hand: we know the maximum possible
6154 value of voffset, and 3) we have to set/reset at least the sizes in
6155 accordance with this maximum value anyway, as we need them to convey
6156 what should be "alloc"ated for this type.
6158 Use -1 as the 'addressable' indication for the field to prevent the
6159 creation of a bitfield. We don't need one, it would have damaging
6160 consequences on the alignment computation, and create_field_decl would
6161 make one without this special argument, for instance because of the
6162 complex position expression. */
6163 field = create_field_decl (get_identifier ("F"), type, record_type, size,
6165 TYPE_FIELDS (record_type) = field;
6167 TYPE_ALIGN (record_type) = base_align;
6168 TYPE_USER_ALIGN (record_type) = 1;
6170 TYPE_SIZE (record_type)
6171 = size_binop (PLUS_EXPR,
6172 size_binop (MULT_EXPR, convert (bitsizetype, size),
6174 bitsize_int (align + room * BITS_PER_UNIT));
6175 TYPE_SIZE_UNIT (record_type)
6176 = size_binop (PLUS_EXPR, size,
6177 size_int (room + align / BITS_PER_UNIT));
6179 SET_TYPE_MODE (record_type, BLKmode);
6180 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
6182 /* Declare it now since it will never be declared otherwise. This is
6183 necessary to ensure that its subtrees are properly marked. */
6184 create_type_decl (name, record_type, NULL, true, false, Empty);
6189 /* Return the result of rounding T up to ALIGN. */
6191 static inline unsigned HOST_WIDE_INT
6192 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
6200 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
6201 as the field type of a packed record if IN_RECORD is true, or as the
6202 component type of a packed array if IN_RECORD is false. See if we can
6203 rewrite it either as a type that has a non-BLKmode, which we can pack
6204 tighter in the packed record case, or as a smaller type. If so, return
6205 the new type. If not, return the original type. */
6208 make_packable_type (tree type, bool in_record)
6210 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
6211 unsigned HOST_WIDE_INT new_size;
6212 tree new_type, old_field, field_list = NULL_TREE;
6214 /* No point in doing anything if the size is zero. */
6218 new_type = make_node (TREE_CODE (type));
6220 /* Copy the name and flags from the old type to that of the new.
6221 Note that we rely on the pointer equality created here for
6222 TYPE_NAME to look through conversions in various places. */
6223 TYPE_NAME (new_type) = TYPE_NAME (type);
6224 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
6225 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
6226 if (TREE_CODE (type) == RECORD_TYPE)
6227 TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type);
6229 /* If we are in a record and have a small size, set the alignment to
6230 try for an integral mode. Otherwise set it to try for a smaller
6231 type with BLKmode. */
6232 if (in_record && size <= MAX_FIXED_MODE_SIZE)
6234 TYPE_ALIGN (new_type) = ceil_alignment (size);
6235 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
6239 unsigned HOST_WIDE_INT align;
6241 /* Do not try to shrink the size if the RM size is not constant. */
6242 if (TYPE_CONTAINS_TEMPLATE_P (type)
6243 || !host_integerp (TYPE_ADA_SIZE (type), 1))
6246 /* Round the RM size up to a unit boundary to get the minimal size
6247 for a BLKmode record. Give up if it's already the size. */
6248 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
6249 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
6250 if (new_size == size)
6253 align = new_size & -new_size;
6254 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
6257 TYPE_USER_ALIGN (new_type) = 1;
6259 /* Now copy the fields, keeping the position and size as we don't want
6260 to change the layout by propagating the packedness downwards. */
6261 for (old_field = TYPE_FIELDS (type); old_field;
6262 old_field = DECL_CHAIN (old_field))
6264 tree new_field_type = TREE_TYPE (old_field);
6265 tree new_field, new_size;
6267 if ((TREE_CODE (new_field_type) == RECORD_TYPE
6268 || TREE_CODE (new_field_type) == UNION_TYPE
6269 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
6270 && !TYPE_FAT_POINTER_P (new_field_type)
6271 && host_integerp (TYPE_SIZE (new_field_type), 1))
6272 new_field_type = make_packable_type (new_field_type, true);
6274 /* However, for the last field in a not already packed record type
6275 that is of an aggregate type, we need to use the RM size in the
6276 packable version of the record type, see finish_record_type. */
6277 if (!DECL_CHAIN (old_field)
6278 && !TYPE_PACKED (type)
6279 && (TREE_CODE (new_field_type) == RECORD_TYPE
6280 || TREE_CODE (new_field_type) == UNION_TYPE
6281 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
6282 && !TYPE_FAT_POINTER_P (new_field_type)
6283 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
6284 && TYPE_ADA_SIZE (new_field_type))
6285 new_size = TYPE_ADA_SIZE (new_field_type);
6287 new_size = DECL_SIZE (old_field);
6290 = create_field_decl (DECL_NAME (old_field), new_field_type, new_type,
6291 new_size, bit_position (old_field),
6293 !DECL_NONADDRESSABLE_P (old_field));
6295 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
6296 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
6297 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
6298 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
6300 DECL_CHAIN (new_field) = field_list;
6301 field_list = new_field;
6304 finish_record_type (new_type, nreverse (field_list), 2, false);
6305 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
6307 /* If this is a padding record, we never want to make the size smaller
6308 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
6309 if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE)
6311 TYPE_SIZE (new_type) = TYPE_SIZE (type);
6312 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
6317 TYPE_SIZE (new_type) = bitsize_int (new_size);
6318 TYPE_SIZE_UNIT (new_type)
6319 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
6322 if (!TYPE_CONTAINS_TEMPLATE_P (type))
6323 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
6325 compute_record_mode (new_type);
6327 /* Try harder to get a packable type if necessary, for example
6328 in case the record itself contains a BLKmode field. */
6329 if (in_record && TYPE_MODE (new_type) == BLKmode)
6330 SET_TYPE_MODE (new_type,
6331 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
6333 /* If neither the mode nor the size has shrunk, return the old type. */
6334 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
6340 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
6341 if needed. We have already verified that SIZE and TYPE are large enough.
6342 GNAT_ENTITY is used to name the resulting record and to issue a warning.
6343 IS_COMPONENT_TYPE is true if this is being done for the component type
6344 of an array. IS_USER_TYPE is true if we must complete the original type.
6345 DEFINITION is true if this type is being defined. SAME_RM_SIZE is true
6346 if the RM size of the resulting type is to be set to SIZE too; otherwise,
6347 it's set to the RM size of the original type. */
6350 maybe_pad_type (tree type, tree size, unsigned int align,
6351 Entity_Id gnat_entity, bool is_component_type,
6352 bool is_user_type, bool definition, bool same_rm_size)
6354 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
6355 tree orig_size = TYPE_SIZE (type);
6358 /* If TYPE is a padded type, see if it agrees with any size and alignment
6359 we were given. If so, return the original type. Otherwise, strip
6360 off the padding, since we will either be returning the inner type
6361 or repadding it. If no size or alignment is specified, use that of
6362 the original padded type. */
6363 if (TYPE_IS_PADDING_P (type))
6366 || operand_equal_p (round_up (size,
6367 MAX (align, TYPE_ALIGN (type))),
6368 round_up (TYPE_SIZE (type),
6369 MAX (align, TYPE_ALIGN (type))),
6371 && (align == 0 || align == TYPE_ALIGN (type)))
6375 size = TYPE_SIZE (type);
6377 align = TYPE_ALIGN (type);
6379 type = TREE_TYPE (TYPE_FIELDS (type));
6380 orig_size = TYPE_SIZE (type);
6383 /* If the size is either not being changed or is being made smaller (which
6384 is not done here and is only valid for bitfields anyway), show the size
6385 isn't changing. Likewise, clear the alignment if it isn't being
6386 changed. Then return if we aren't doing anything. */
6388 && (operand_equal_p (size, orig_size, 0)
6389 || (TREE_CODE (orig_size) == INTEGER_CST
6390 && tree_int_cst_lt (size, orig_size))))
6393 if (align == TYPE_ALIGN (type))
6396 if (align == 0 && !size)
6399 /* If requested, complete the original type and give it a name. */
6401 create_type_decl (get_entity_name (gnat_entity), type,
6402 NULL, !Comes_From_Source (gnat_entity),
6404 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6405 && DECL_IGNORED_P (TYPE_NAME (type))),
6408 /* We used to modify the record in place in some cases, but that could
6409 generate incorrect debugging information. So make a new record
6411 record = make_node (RECORD_TYPE);
6412 TYPE_PADDING_P (record) = 1;
6414 if (Present (gnat_entity))
6415 TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD");
6417 TYPE_VOLATILE (record)
6418 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6420 TYPE_ALIGN (record) = align;
6421 TYPE_SIZE (record) = size ? size : orig_size;
6422 TYPE_SIZE_UNIT (record)
6423 = convert (sizetype,
6424 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6425 bitsize_unit_node));
6427 /* If we are changing the alignment and the input type is a record with
6428 BLKmode and a small constant size, try to make a form that has an
6429 integral mode. This might allow the padding record to also have an
6430 integral mode, which will be much more efficient. There is no point
6431 in doing so if a size is specified unless it is also a small constant
6432 size and it is incorrect to do so if we cannot guarantee that the mode
6433 will be naturally aligned since the field must always be addressable.
6435 ??? This might not always be a win when done for a stand-alone object:
6436 since the nominal and the effective type of the object will now have
6437 different modes, a VIEW_CONVERT_EXPR will be required for converting
6438 between them and it might be hard to overcome afterwards, including
6439 at the RTL level when the stand-alone object is accessed as a whole. */
6441 && TREE_CODE (type) == RECORD_TYPE
6442 && TYPE_MODE (type) == BLKmode
6443 && TREE_CODE (orig_size) == INTEGER_CST
6444 && !TREE_OVERFLOW (orig_size)
6445 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6447 || (TREE_CODE (size) == INTEGER_CST
6448 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6450 tree packable_type = make_packable_type (type, true);
6451 if (TYPE_MODE (packable_type) != BLKmode
6452 && align >= TYPE_ALIGN (packable_type))
6453 type = packable_type;
6456 /* Now create the field with the original size. */
6457 field = create_field_decl (get_identifier ("F"), type, record, orig_size,
6458 bitsize_zero_node, 0, 1);
6459 DECL_INTERNAL_P (field) = 1;
6461 /* Do not emit debug info until after the auxiliary record is built. */
6462 finish_record_type (record, field, 1, false);
6464 /* Set the same size for its RM size if requested; otherwise reuse
6465 the RM size of the original type. */
6466 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6468 /* Unless debugging information isn't being written for the input type,
6469 write a record that shows what we are a subtype of and also make a
6470 variable that indicates our size, if still variable. */
6471 if (TREE_CODE (orig_size) != INTEGER_CST
6472 && TYPE_NAME (record)
6474 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6475 && DECL_IGNORED_P (TYPE_NAME (type))))
6477 tree marker = make_node (RECORD_TYPE);
6478 tree name = TYPE_NAME (record);
6479 tree orig_name = TYPE_NAME (type);
6481 if (TREE_CODE (name) == TYPE_DECL)
6482 name = DECL_NAME (name);
6484 if (TREE_CODE (orig_name) == TYPE_DECL)
6485 orig_name = DECL_NAME (orig_name);
6487 TYPE_NAME (marker) = concat_name (name, "XVS");
6488 finish_record_type (marker,
6489 create_field_decl (orig_name,
6490 build_reference_type (type),
6491 marker, NULL_TREE, NULL_TREE,
6495 add_parallel_type (TYPE_STUB_DECL (record), marker);
6497 if (definition && size && TREE_CODE (size) != INTEGER_CST)
6498 TYPE_SIZE_UNIT (marker)
6499 = create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6500 TYPE_SIZE_UNIT (record), false, false, false,
6501 false, NULL, gnat_entity);
6504 rest_of_record_type_compilation (record);
6506 /* If the size was widened explicitly, maybe give a warning. Take the
6507 original size as the maximum size of the input if there was an
6508 unconstrained record involved and round it up to the specified alignment,
6509 if one was specified. */
6510 if (CONTAINS_PLACEHOLDER_P (orig_size))
6511 orig_size = max_size (orig_size, true);
6514 orig_size = round_up (orig_size, align);
6516 if (Present (gnat_entity)
6518 && TREE_CODE (size) != MAX_EXPR
6519 && TREE_CODE (size) != COND_EXPR
6520 && !operand_equal_p (size, orig_size, 0)
6521 && !(TREE_CODE (size) == INTEGER_CST
6522 && TREE_CODE (orig_size) == INTEGER_CST
6523 && (TREE_OVERFLOW (size)
6524 || TREE_OVERFLOW (orig_size)
6525 || tree_int_cst_lt (size, orig_size))))
6527 Node_Id gnat_error_node = Empty;
6529 if (Is_Packed_Array_Type (gnat_entity))
6530 gnat_entity = Original_Array_Type (gnat_entity);
6532 if ((Ekind (gnat_entity) == E_Component
6533 || Ekind (gnat_entity) == E_Discriminant)
6534 && Present (Component_Clause (gnat_entity)))
6535 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6536 else if (Present (Size_Clause (gnat_entity)))
6537 gnat_error_node = Expression (Size_Clause (gnat_entity));
6539 /* Generate message only for entities that come from source, since
6540 if we have an entity created by expansion, the message will be
6541 generated for some other corresponding source entity. */
6542 if (Comes_From_Source (gnat_entity))
6544 if (Present (gnat_error_node))
6545 post_error_ne_tree ("{^ }bits of & unused?",
6546 gnat_error_node, gnat_entity,
6547 size_diffop (size, orig_size));
6548 else if (is_component_type)
6549 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6550 gnat_entity, gnat_entity,
6551 size_diffop (size, orig_size));
6558 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6559 the value passed against the list of choices. */
6562 choices_to_gnu (tree operand, Node_Id choices)
6566 tree result = integer_zero_node;
6567 tree this_test, low = 0, high = 0, single = 0;
6569 for (choice = First (choices); Present (choice); choice = Next (choice))
6571 switch (Nkind (choice))
6574 low = gnat_to_gnu (Low_Bound (choice));
6575 high = gnat_to_gnu (High_Bound (choice));
6578 = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node,
6579 build_binary_op (GE_EXPR, boolean_type_node,
6581 build_binary_op (LE_EXPR, boolean_type_node,
6586 case N_Subtype_Indication:
6587 gnat_temp = Range_Expression (Constraint (choice));
6588 low = gnat_to_gnu (Low_Bound (gnat_temp));
6589 high = gnat_to_gnu (High_Bound (gnat_temp));
6592 = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node,
6593 build_binary_op (GE_EXPR, boolean_type_node,
6595 build_binary_op (LE_EXPR, boolean_type_node,
6600 case N_Expanded_Name:
6601 /* This represents either a subtype range, an enumeration
6602 literal, or a constant Ekind says which. If an enumeration
6603 literal or constant, fall through to the next case. */
6604 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6605 && Ekind (Entity (choice)) != E_Constant)
6607 tree type = gnat_to_gnu_type (Entity (choice));
6609 low = TYPE_MIN_VALUE (type);
6610 high = TYPE_MAX_VALUE (type);
6613 = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node,
6614 build_binary_op (GE_EXPR, boolean_type_node,
6616 build_binary_op (LE_EXPR, boolean_type_node,
6621 /* ... fall through ... */
6623 case N_Character_Literal:
6624 case N_Integer_Literal:
6625 single = gnat_to_gnu (choice);
6626 this_test = build_binary_op (EQ_EXPR, boolean_type_node, operand,
6630 case N_Others_Choice:
6631 this_test = integer_one_node;
6638 result = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, result,
6645 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6646 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6649 adjust_packed (tree field_type, tree record_type, int packed)
6651 /* If the field contains an item of variable size, we cannot pack it
6652 because we cannot create temporaries of non-fixed size in case
6653 we need to take the address of the field. See addressable_p and
6654 the notes on the addressability issues for further details. */
6655 if (is_variable_size (field_type))
6658 /* If the alignment of the record is specified and the field type
6659 is over-aligned, request Storage_Unit alignment for the field. */
6662 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6671 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6672 placed in GNU_RECORD_TYPE.
6674 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6675 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6676 record has a specified alignment.
6678 DEFINITION is true if this field is for a record being defined.
6680 DEBUG_INFO_P is true if we need to write debug information for types
6681 that we may create in the process. */
6684 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6685 bool definition, bool debug_info_p)
6687 tree gnu_field_id = get_entity_name (gnat_field);
6688 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6689 tree gnu_field, gnu_size, gnu_pos;
6690 bool needs_strict_alignment
6691 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6692 || Treat_As_Volatile (gnat_field));
6694 /* If this field requires strict alignment, we cannot pack it because
6695 it would very likely be under-aligned in the record. */
6696 if (needs_strict_alignment)
6699 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6701 /* If a size is specified, use it. Otherwise, if the record type is packed,
6702 use the official RM size. See "Handling of Type'Size Values" in Einfo
6703 for further details. */
6704 if (Known_Static_Esize (gnat_field))
6705 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6706 gnat_field, FIELD_DECL, false, true);
6707 else if (packed == 1)
6708 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6709 gnat_field, FIELD_DECL, false, true);
6711 gnu_size = NULL_TREE;
6713 /* If we have a specified size that is smaller than that of the field's type,
6714 or a position is specified, and the field's type is a record that doesn't
6715 require strict alignment, see if we can get either an integral mode form
6716 of the type or a smaller form. If we can, show a size was specified for
6717 the field if there wasn't one already, so we know to make this a bitfield
6718 and avoid making things wider.
6720 Changing to an integral mode form is useful when the record is packed as
6721 we can then place the field at a non-byte-aligned position and so achieve
6722 tighter packing. This is in addition required if the field shares a byte
6723 with another field and the front-end lets the back-end handle the access
6724 to the field, because GCC cannot handle non-byte-aligned BLKmode fields.
6726 Changing to a smaller form is required if the specified size is smaller
6727 than that of the field's type and the type contains sub-fields that are
6728 padded, in order to avoid generating accesses to these sub-fields that
6729 are wider than the field.
6731 We avoid the transformation if it is not required or potentially useful,
6732 as it might entail an increase of the field's alignment and have ripple
6733 effects on the outer record type. A typical case is a field known to be
6734 byte-aligned and not to share a byte with another field. */
6735 if (!needs_strict_alignment
6736 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6737 && !TYPE_FAT_POINTER_P (gnu_field_type)
6738 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6741 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6742 || (Present (Component_Clause (gnat_field))
6743 && !(UI_To_Int (Component_Bit_Offset (gnat_field))
6744 % BITS_PER_UNIT == 0
6745 && value_factor_p (gnu_size, BITS_PER_UNIT)))))))
6747 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6748 if (gnu_packable_type != gnu_field_type)
6750 gnu_field_type = gnu_packable_type;
6752 gnu_size = rm_size (gnu_field_type);
6756 /* If we are packing the record and the field is BLKmode, round the
6757 size up to a byte boundary. */
6758 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6759 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6761 if (Present (Component_Clause (gnat_field)))
6763 Entity_Id gnat_parent
6764 = Parent_Subtype (Underlying_Type (Scope (gnat_field)));
6766 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6767 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6768 gnat_field, FIELD_DECL, false, true);
6770 /* Ensure the position does not overlap with the parent subtype, if there
6771 is one. This test is omitted if the parent of the tagged type has a
6772 full rep clause since, in this case, component clauses are allowed to
6773 overlay the space allocated for the parent type and the front-end has
6774 checked that there are no overlapping components. */
6775 if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent))
6777 tree gnu_parent = gnat_to_gnu_type (gnat_parent);
6779 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6780 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6783 ("offset of& must be beyond parent{, minimum allowed is ^}",
6784 First_Bit (Component_Clause (gnat_field)), gnat_field,
6785 TYPE_SIZE_UNIT (gnu_parent));
6789 /* If this field needs strict alignment, ensure the record is
6790 sufficiently aligned and that that position and size are
6791 consistent with the alignment. */
6792 if (needs_strict_alignment)
6794 TYPE_ALIGN (gnu_record_type)
6795 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6798 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6800 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6802 ("atomic field& must be natural size of type{ (^)}",
6803 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6804 TYPE_SIZE (gnu_field_type));
6806 else if (Is_Aliased (gnat_field))
6808 ("size of aliased field& must be ^ bits",
6809 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6810 TYPE_SIZE (gnu_field_type));
6812 else if (Strict_Alignment (Etype (gnat_field)))
6814 ("size of & with aliased or tagged components not ^ bits",
6815 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6816 TYPE_SIZE (gnu_field_type));
6818 gnu_size = NULL_TREE;
6821 if (!integer_zerop (size_binop
6822 (TRUNC_MOD_EXPR, gnu_pos,
6823 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6825 if (Is_Aliased (gnat_field))
6827 ("position of aliased field& must be multiple of ^ bits",
6828 First_Bit (Component_Clause (gnat_field)), gnat_field,
6829 TYPE_ALIGN (gnu_field_type));
6831 else if (Treat_As_Volatile (gnat_field))
6833 ("position of volatile field& must be multiple of ^ bits",
6834 First_Bit (Component_Clause (gnat_field)), gnat_field,
6835 TYPE_ALIGN (gnu_field_type));
6837 else if (Strict_Alignment (Etype (gnat_field)))
6839 ("position of & with aliased or tagged components not multiple of ^ bits",
6840 First_Bit (Component_Clause (gnat_field)), gnat_field,
6841 TYPE_ALIGN (gnu_field_type));
6846 gnu_pos = NULL_TREE;
6850 if (Is_Atomic (gnat_field))
6851 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6854 /* If the record has rep clauses and this is the tag field, make a rep
6855 clause for it as well. */
6856 else if (Has_Specified_Layout (Scope (gnat_field))
6857 && Chars (gnat_field) == Name_uTag)
6859 gnu_pos = bitsize_zero_node;
6860 gnu_size = TYPE_SIZE (gnu_field_type);
6864 gnu_pos = NULL_TREE;
6866 /* We need to make the size the maximum for the type if it is
6867 self-referential and an unconstrained type. In that case, we can't
6868 pack the field since we can't make a copy to align it. */
6869 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6871 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6872 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6874 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6878 /* If a size is specified, adjust the field's type to it. */
6881 tree orig_field_type;
6883 /* If the field's type is justified modular, we would need to remove
6884 the wrapper to (better) meet the layout requirements. However we
6885 can do so only if the field is not aliased to preserve the unique
6886 layout and if the prescribed size is not greater than that of the
6887 packed array to preserve the justification. */
6888 if (!needs_strict_alignment
6889 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6890 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6891 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6893 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6896 = make_type_from_size (gnu_field_type, gnu_size,
6897 Has_Biased_Representation (gnat_field));
6899 orig_field_type = gnu_field_type;
6900 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6901 false, false, definition, true);
6903 /* If a padding record was made, declare it now since it will never be
6904 declared otherwise. This is necessary to ensure that its subtrees
6905 are properly marked. */
6906 if (gnu_field_type != orig_field_type
6907 && !DECL_P (TYPE_NAME (gnu_field_type)))
6908 create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, NULL,
6909 true, debug_info_p, gnat_field);
6912 /* Otherwise (or if there was an error), don't specify a position. */
6914 gnu_pos = NULL_TREE;
6916 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6917 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6919 /* Now create the decl for the field. */
6921 = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6922 gnu_size, gnu_pos, packed, Is_Aliased (gnat_field));
6923 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6924 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6926 if (Ekind (gnat_field) == E_Discriminant)
6927 DECL_DISCRIMINANT_NUMBER (gnu_field)
6928 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6933 /* Return true if TYPE is a type with variable size, a padding type with a
6934 field of variable size or is a record that has a field such a field. */
6937 is_variable_size (tree type)
6941 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6944 if (TYPE_IS_PADDING_P (type)
6945 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6948 if (TREE_CODE (type) != RECORD_TYPE
6949 && TREE_CODE (type) != UNION_TYPE
6950 && TREE_CODE (type) != QUAL_UNION_TYPE)
6953 for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
6954 if (is_variable_size (TREE_TYPE (field)))
6960 /* qsort comparer for the bit positions of two record components. */
6963 compare_field_bitpos (const PTR rt1, const PTR rt2)
6965 const_tree const field1 = * (const_tree const *) rt1;
6966 const_tree const field2 = * (const_tree const *) rt2;
6968 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6970 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6973 /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set
6974 the result as the field list of GNU_RECORD_TYPE and finish it up. When
6975 called from gnat_to_gnu_entity during the processing of a record type
6976 definition, the GCC node for the parent, if any, will be the single field
6977 of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the
6978 GNU_FIELD_LIST. The other calls to this function are recursive calls for
6979 the component list of a variant and, in this case, GNU_FIELD_LIST is empty.
6981 PACKED is 1 if this is for a packed record, -1 if this is for a record
6982 with Component_Alignment of Storage_Unit, -2 if this is for a record
6983 with a specified alignment.
6985 DEFINITION is true if we are defining this record type.
6987 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6988 with a rep clause is to be added; in this case, that is all that should
6989 be done with such fields.
6991 CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying
6992 out the record. This means the alignment only serves to force fields to
6993 be bitfields, but not to require the record to be that aligned. This is
6996 ALL_REP is true if a rep clause is present for all the fields.
6998 UNCHECKED_UNION is true if we are building this type for a record with a
6999 Pragma Unchecked_Union.
7001 DEBUG_INFO_P is true if we need to write debug information about the type.
7003 MAYBE_UNUSED is true if this type may be unused in the end; this doesn't
7004 mean that its contents may be unused as well, but only the container. */
7008 components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
7009 tree gnu_field_list, int packed, bool definition,
7010 tree *p_gnu_rep_list, bool cancel_alignment,
7011 bool all_rep, bool unchecked_union, bool debug_info_p,
7014 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
7015 bool layout_with_rep = false;
7016 Node_Id component_decl, variant_part;
7017 tree gnu_our_rep_list = NULL_TREE;
7018 tree gnu_field, gnu_next, gnu_last = tree_last (gnu_field_list);
7020 /* For each component referenced in a component declaration create a GCC
7021 field and add it to the list, skipping pragmas in the GNAT list. */
7022 if (Present (Component_Items (gnat_component_list)))
7024 = First_Non_Pragma (Component_Items (gnat_component_list));
7025 Present (component_decl);
7026 component_decl = Next_Non_Pragma (component_decl))
7028 Entity_Id gnat_field = Defining_Entity (component_decl);
7029 Name_Id gnat_name = Chars (gnat_field);
7031 /* If present, the _Parent field must have been created as the single
7032 field of the record type. Put it before any other fields. */
7033 if (gnat_name == Name_uParent)
7035 gnu_field = TYPE_FIELDS (gnu_record_type);
7036 gnu_field_list = chainon (gnu_field_list, gnu_field);
7040 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
7041 definition, debug_info_p);
7043 /* If this is the _Tag field, put it before any other fields. */
7044 if (gnat_name == Name_uTag)
7045 gnu_field_list = chainon (gnu_field_list, gnu_field);
7047 /* If this is the _Controller field, put it before the other
7048 fields except for the _Tag or _Parent field. */
7049 else if (gnat_name == Name_uController && gnu_last)
7051 DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last);
7052 DECL_CHAIN (gnu_last) = gnu_field;
7055 /* If this is a regular field, put it after the other fields. */
7058 DECL_CHAIN (gnu_field) = gnu_field_list;
7059 gnu_field_list = gnu_field;
7061 gnu_last = gnu_field;
7065 save_gnu_tree (gnat_field, gnu_field, false);
7068 /* At the end of the component list there may be a variant part. */
7069 variant_part = Variant_Part (gnat_component_list);
7071 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
7072 mutually exclusive and should go in the same memory. To do this we need
7073 to treat each variant as a record whose elements are created from the
7074 component list for the variant. So here we create the records from the
7075 lists for the variants and put them all into the QUAL_UNION_TYPE.
7076 If this is an Unchecked_Union, we make a UNION_TYPE instead or
7077 use GNU_RECORD_TYPE if there are no fields so far. */
7078 if (Present (variant_part))
7080 Node_Id gnat_discr = Name (variant_part), variant;
7081 tree gnu_discr = gnat_to_gnu (gnat_discr);
7082 tree gnu_name = TYPE_NAME (gnu_record_type);
7084 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
7086 tree gnu_union_type, gnu_union_name, gnu_union_field;
7087 tree gnu_variant_list = NULL_TREE;
7089 if (TREE_CODE (gnu_name) == TYPE_DECL)
7090 gnu_name = DECL_NAME (gnu_name);
7093 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
7095 /* Reuse an enclosing union if all fields are in the variant part
7096 and there is no representation clause on the record, to match
7097 the layout of C unions. There is an associated check below. */
7099 && TREE_CODE (gnu_record_type) == UNION_TYPE
7100 && !TYPE_PACKED (gnu_record_type))
7101 gnu_union_type = gnu_record_type;
7105 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
7107 TYPE_NAME (gnu_union_type) = gnu_union_name;
7108 TYPE_ALIGN (gnu_union_type) = 0;
7109 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
7112 for (variant = First_Non_Pragma (Variants (variant_part));
7114 variant = Next_Non_Pragma (variant))
7116 tree gnu_variant_type = make_node (RECORD_TYPE);
7117 tree gnu_inner_name;
7120 Get_Variant_Encoding (variant);
7121 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
7122 TYPE_NAME (gnu_variant_type)
7123 = concat_name (gnu_union_name,
7124 IDENTIFIER_POINTER (gnu_inner_name));
7126 /* Set the alignment of the inner type in case we need to make
7127 inner objects into bitfields, but then clear it out so the
7128 record actually gets only the alignment required. */
7129 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
7130 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
7132 /* Similarly, if the outer record has a size specified and all
7133 fields have record rep clauses, we can propagate the size
7134 into the variant part. */
7135 if (all_rep_and_size)
7137 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
7138 TYPE_SIZE_UNIT (gnu_variant_type)
7139 = TYPE_SIZE_UNIT (gnu_record_type);
7142 /* Add the fields into the record type for the variant. Note that
7143 we aren't sure to really use it at this point, see below. */
7144 components_to_record (gnu_variant_type, Component_List (variant),
7145 NULL_TREE, packed, definition,
7146 &gnu_our_rep_list, !all_rep_and_size, all_rep,
7147 unchecked_union, debug_info_p, true);
7149 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
7151 Set_Present_Expr (variant, annotate_value (gnu_qual));
7153 /* If this is an Unchecked_Union and we have exactly one field,
7154 use this field directly to match the layout of C unions. */
7156 && TYPE_FIELDS (gnu_variant_type)
7157 && !DECL_CHAIN (TYPE_FIELDS (gnu_variant_type)))
7158 gnu_field = TYPE_FIELDS (gnu_variant_type);
7161 /* Deal with packedness like in gnat_to_gnu_field. */
7163 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
7165 /* Finalize the record type now. We used to throw away
7166 empty records but we no longer do that because we need
7167 them to generate complete debug info for the variant;
7168 otherwise, the union type definition will be lacking
7169 the fields associated with these empty variants. */
7170 rest_of_record_type_compilation (gnu_variant_type);
7171 create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type,
7172 NULL, true, debug_info_p, gnat_component_list);
7175 = create_field_decl (gnu_inner_name, gnu_variant_type,
7178 ? TYPE_SIZE (gnu_variant_type) : 0,
7180 ? bitsize_zero_node : 0,
7183 DECL_INTERNAL_P (gnu_field) = 1;
7185 if (!unchecked_union)
7186 DECL_QUALIFIER (gnu_field) = gnu_qual;
7189 DECL_CHAIN (gnu_field) = gnu_variant_list;
7190 gnu_variant_list = gnu_field;
7193 /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */
7194 if (gnu_variant_list)
7196 int union_field_packed;
7198 if (all_rep_and_size)
7200 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
7201 TYPE_SIZE_UNIT (gnu_union_type)
7202 = TYPE_SIZE_UNIT (gnu_record_type);
7205 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
7206 all_rep_and_size ? 1 : 0, debug_info_p);
7208 /* If GNU_UNION_TYPE is our record type, it means we must have an
7209 Unchecked_Union with no fields. Verify that and, if so, just
7211 if (gnu_union_type == gnu_record_type)
7213 gcc_assert (unchecked_union
7215 && !gnu_our_rep_list);
7219 create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type,
7220 NULL, true, debug_info_p, gnat_component_list);
7222 /* Deal with packedness like in gnat_to_gnu_field. */
7224 = adjust_packed (gnu_union_type, gnu_record_type, packed);
7227 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
7228 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
7229 all_rep ? bitsize_zero_node : 0,
7230 union_field_packed, 0);
7232 DECL_INTERNAL_P (gnu_union_field) = 1;
7233 DECL_CHAIN (gnu_union_field) = gnu_field_list;
7234 gnu_field_list = gnu_union_field;
7238 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
7239 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do
7240 this in a separate pass since we want to handle the discriminants but
7241 can't play with them until we've used them in debugging data above.
7243 ??? If we then reorder them, debugging information will be wrong but
7244 there's nothing that can be done about this at the moment. */
7245 gnu_last = NULL_TREE;
7246 for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next)
7248 gnu_next = DECL_CHAIN (gnu_field);
7250 if (DECL_FIELD_OFFSET (gnu_field))
7253 gnu_field_list = gnu_next;
7255 DECL_CHAIN (gnu_last) = gnu_next;
7257 DECL_CHAIN (gnu_field) = gnu_our_rep_list;
7258 gnu_our_rep_list = gnu_field;
7261 gnu_last = gnu_field;
7264 /* If we have any fields in our rep'ed field list and it is not the case that
7265 all the fields in the record have rep clauses and P_REP_LIST is nonzero,
7266 set it and ignore these fields. */
7267 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
7268 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
7270 /* Otherwise, sort the fields by bit position and put them into their own
7271 record, before the others, if we also have fields without rep clauses. */
7272 else if (gnu_our_rep_list)
7275 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
7276 int i, len = list_length (gnu_our_rep_list);
7277 tree *gnu_arr = XALLOCAVEC (tree, len);
7279 for (gnu_field = gnu_our_rep_list, i = 0;
7281 gnu_field = DECL_CHAIN (gnu_field), i++)
7282 gnu_arr[i] = gnu_field;
7284 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
7286 /* Put the fields in the list in order of increasing position, which
7287 means we start from the end. */
7288 gnu_our_rep_list = NULL_TREE;
7289 for (i = len - 1; i >= 0; i--)
7291 DECL_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
7292 gnu_our_rep_list = gnu_arr[i];
7293 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
7298 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, debug_info_p);
7300 = create_field_decl (get_identifier ("REP"), gnu_rep_type,
7301 gnu_record_type, NULL_TREE, NULL_TREE, 0, 1);
7302 DECL_INTERNAL_P (gnu_field) = 1;
7303 gnu_field_list = chainon (gnu_field_list, gnu_field);
7307 layout_with_rep = true;
7308 gnu_field_list = nreverse (gnu_our_rep_list);
7312 if (cancel_alignment)
7313 TYPE_ALIGN (gnu_record_type) = 0;
7315 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
7316 layout_with_rep ? 1 : 0, debug_info_p && !maybe_unused);
7319 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
7320 placed into an Esize, Component_Bit_Offset, or Component_Size value
7321 in the GNAT tree. */
7324 annotate_value (tree gnu_size)
7327 Node_Ref_Or_Val ops[3], ret;
7328 struct tree_int_map **h = NULL;
7331 /* See if we've already saved the value for this node. */
7332 if (EXPR_P (gnu_size))
7334 struct tree_int_map in;
7335 if (!annotate_value_cache)
7336 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
7337 tree_int_map_eq, 0);
7338 in.base.from = gnu_size;
7339 h = (struct tree_int_map **)
7340 htab_find_slot (annotate_value_cache, &in, INSERT);
7343 return (Node_Ref_Or_Val) (*h)->to;
7346 /* If we do not return inside this switch, TCODE will be set to the
7347 code to use for a Create_Node operand and LEN (set above) will be
7348 the number of recursive calls for us to make. */
7350 switch (TREE_CODE (gnu_size))
7353 if (TREE_OVERFLOW (gnu_size))
7356 /* This may come from a conversion from some smaller type, so ensure
7357 this is in bitsizetype. */
7358 gnu_size = convert (bitsizetype, gnu_size);
7360 /* For a negative value, build NEGATE_EXPR of the opposite. Such values
7361 appear in expressions containing aligning patterns. Note that, since
7362 sizetype is sign-extended but nonetheless unsigned, we don't directly
7363 use tree_int_cst_sgn. */
7364 if (TREE_INT_CST_HIGH (gnu_size) < 0)
7366 tree op_size = fold_build1 (NEGATE_EXPR, bitsizetype, gnu_size);
7367 return annotate_value (build1 (NEGATE_EXPR, bitsizetype, op_size));
7370 return UI_From_gnu (gnu_size);
7373 /* The only case we handle here is a simple discriminant reference. */
7374 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
7375 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
7376 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7377 return Create_Node (Discrim_Val,
7378 annotate_value (DECL_DISCRIMINANT_NUMBER
7379 (TREE_OPERAND (gnu_size, 1))),
7384 CASE_CONVERT: case NON_LVALUE_EXPR:
7385 return annotate_value (TREE_OPERAND (gnu_size, 0));
7387 /* Now just list the operations we handle. */
7388 case COND_EXPR: tcode = Cond_Expr; break;
7389 case PLUS_EXPR: tcode = Plus_Expr; break;
7390 case MINUS_EXPR: tcode = Minus_Expr; break;
7391 case MULT_EXPR: tcode = Mult_Expr; break;
7392 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7393 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7394 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7395 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7396 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7397 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7398 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7399 case NEGATE_EXPR: tcode = Negate_Expr; break;
7400 case MIN_EXPR: tcode = Min_Expr; break;
7401 case MAX_EXPR: tcode = Max_Expr; break;
7402 case ABS_EXPR: tcode = Abs_Expr; break;
7403 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7404 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7405 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7406 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7407 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7408 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7409 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7410 case LT_EXPR: tcode = Lt_Expr; break;
7411 case LE_EXPR: tcode = Le_Expr; break;
7412 case GT_EXPR: tcode = Gt_Expr; break;
7413 case GE_EXPR: tcode = Ge_Expr; break;
7414 case EQ_EXPR: tcode = Eq_Expr; break;
7415 case NE_EXPR: tcode = Ne_Expr; break;
7419 tree t = maybe_inline_call_in_expr (gnu_size);
7421 return annotate_value (t);
7424 /* Fall through... */
7430 /* Now get each of the operands that's relevant for this code. If any
7431 cannot be expressed as a repinfo node, say we can't. */
7432 for (i = 0; i < 3; i++)
7435 for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++)
7437 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7438 if (ops[i] == No_Uint)
7442 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7444 /* Save the result in the cache. */
7447 *h = ggc_alloc_tree_int_map ();
7448 (*h)->base.from = gnu_size;
7455 /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception)
7456 and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the
7457 size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null.
7458 BY_REF is true if the object is used by reference and BY_DOUBLE_REF is
7459 true if the object is used by double reference. */
7462 annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref,
7468 gnu_type = TREE_TYPE (gnu_type);
7470 if (TYPE_IS_FAT_POINTER_P (gnu_type))
7471 gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type);
7473 gnu_type = TREE_TYPE (gnu_type);
7476 if (Unknown_Esize (gnat_entity))
7478 if (TREE_CODE (gnu_type) == RECORD_TYPE
7479 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7480 size = TYPE_SIZE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type))));
7482 size = TYPE_SIZE (gnu_type);
7485 Set_Esize (gnat_entity, annotate_value (size));
7488 if (Unknown_Alignment (gnat_entity))
7489 Set_Alignment (gnat_entity,
7490 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
7493 /* Return first element of field list whose TREE_PURPOSE is the same as ELEM.
7494 Return NULL_TREE if there is no such element in the list. */
7497 purpose_member_field (const_tree elem, tree list)
7501 tree field = TREE_PURPOSE (list);
7502 if (SAME_FIELD_P (field, elem))
7504 list = TREE_CHAIN (list);
7509 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type,
7510 set Component_Bit_Offset and Esize of the components to the position and
7511 size used by Gigi. */
7514 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7516 Entity_Id gnat_field;
7519 /* We operate by first making a list of all fields and their position (we
7520 can get the size easily) and then update all the sizes in the tree. */
7522 = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node,
7523 BIGGEST_ALIGNMENT, NULL_TREE);
7525 for (gnat_field = First_Entity (gnat_entity);
7526 Present (gnat_field);
7527 gnat_field = Next_Entity (gnat_field))
7528 if (Ekind (gnat_field) == E_Component
7529 || (Ekind (gnat_field) == E_Discriminant
7530 && !Is_Unchecked_Union (Scope (gnat_field))))
7532 tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field),
7538 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7540 /* In this mode the tag and parent components are not
7541 generated, so we add the appropriate offset to each
7542 component. For a component appearing in the current
7543 extension, the offset is the size of the parent. */
7544 if (Is_Derived_Type (gnat_entity)
7545 && Original_Record_Component (gnat_field) == gnat_field)
7547 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7550 parent_offset = bitsize_int (POINTER_SIZE);
7553 parent_offset = bitsize_zero_node;
7555 Set_Component_Bit_Offset
7558 (size_binop (PLUS_EXPR,
7559 bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0),
7560 TREE_VEC_ELT (TREE_VALUE (t), 2)),
7563 Set_Esize (gnat_field,
7564 annotate_value (DECL_SIZE (TREE_PURPOSE (t))));
7566 else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity))
7568 /* If there is no entry, this is an inherited component whose
7569 position is the same as in the parent type. */
7570 Set_Component_Bit_Offset
7572 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7574 Set_Esize (gnat_field,
7575 Esize (Original_Record_Component (gnat_field)));
7580 /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is
7581 the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the
7582 value to be placed into DECL_OFFSET_ALIGN and the bit position. The list
7583 of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT
7584 is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the
7585 bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a
7586 pre-existing list to be chained to the newly created entries. */
7589 build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos,
7590 tree gnu_bitpos, unsigned int offset_align, tree gnu_list)
7594 for (gnu_field = TYPE_FIELDS (gnu_type);
7596 gnu_field = DECL_CHAIN (gnu_field))
7598 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7599 DECL_FIELD_BIT_OFFSET (gnu_field));
7600 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7601 DECL_FIELD_OFFSET (gnu_field));
7602 unsigned int our_offset_align
7603 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7604 tree v = make_tree_vec (3);
7606 TREE_VEC_ELT (v, 0) = gnu_our_offset;
7607 TREE_VEC_ELT (v, 1) = size_int (our_offset_align);
7608 TREE_VEC_ELT (v, 2) = gnu_our_bitpos;
7609 gnu_list = tree_cons (gnu_field, v, gnu_list);
7611 /* Recurse on internal fields, flattening the nested fields except for
7612 those in the variant part, if requested. */
7613 if (DECL_INTERNAL_P (gnu_field))
7615 tree gnu_field_type = TREE_TYPE (gnu_field);
7616 if (do_not_flatten_variant
7617 && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE)
7619 = build_position_list (gnu_field_type, do_not_flatten_variant,
7620 size_zero_node, bitsize_zero_node,
7621 BIGGEST_ALIGNMENT, gnu_list);
7624 = build_position_list (gnu_field_type, do_not_flatten_variant,
7625 gnu_our_offset, gnu_our_bitpos,
7626 our_offset_align, gnu_list);
7633 /* Return a VEC describing the substitutions needed to reflect the
7634 discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can
7635 be in any order. The values in an element of the VEC are in the form
7636 of operands to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for
7637 a definition of GNAT_SUBTYPE. */
7639 static VEC(subst_pair,heap) *
7640 build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition)
7642 VEC(subst_pair,heap) *gnu_vec = NULL;
7643 Entity_Id gnat_discrim;
7646 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
7647 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
7648 Present (gnat_discrim);
7649 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
7650 gnat_value = Next_Elmt (gnat_value))
7651 /* Ignore access discriminants. */
7652 if (!Is_Access_Type (Etype (Node (gnat_value))))
7654 tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim);
7655 tree replacement = convert (TREE_TYPE (gnu_field),
7656 elaborate_expression
7657 (Node (gnat_value), gnat_subtype,
7658 get_entity_name (gnat_discrim),
7659 definition, true, false));
7660 subst_pair *s = VEC_safe_push (subst_pair, heap, gnu_vec, NULL);
7661 s->discriminant = gnu_field;
7662 s->replacement = replacement;
7668 /* Scan all fields in QUAL_UNION_TYPE and return a VEC describing the
7669 variants of QUAL_UNION_TYPE that are still relevant after applying
7670 the substitutions described in SUBST_LIST. VARIANT_LIST is a
7671 pre-existing VEC onto which newly created entries should be
7674 static VEC(variant_desc,heap) *
7675 build_variant_list (tree qual_union_type, VEC(subst_pair,heap) *subst_list,
7676 VEC(variant_desc,heap) *variant_list)
7680 for (gnu_field = TYPE_FIELDS (qual_union_type);
7682 gnu_field = DECL_CHAIN (gnu_field))
7684 tree qual = DECL_QUALIFIER (gnu_field);
7688 FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s)
7689 qual = SUBSTITUTE_IN_EXPR (qual, s->discriminant, s->replacement);
7691 /* If the new qualifier is not unconditionally false, its variant may
7692 still be accessed. */
7693 if (!integer_zerop (qual))
7696 tree variant_type = TREE_TYPE (gnu_field), variant_subpart;
7698 v = VEC_safe_push (variant_desc, heap, variant_list, NULL);
7699 v->type = variant_type;
7700 v->field = gnu_field;
7702 v->record = NULL_TREE;
7704 /* Recurse on the variant subpart of the variant, if any. */
7705 variant_subpart = get_variant_part (variant_type);
7706 if (variant_subpart)
7707 variant_list = build_variant_list (TREE_TYPE (variant_subpart),
7708 subst_list, variant_list);
7710 /* If the new qualifier is unconditionally true, the subsequent
7711 variants cannot be accessed. */
7712 if (integer_onep (qual))
7717 return variant_list;
7720 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7721 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7722 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7723 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7724 for the size of a field. COMPONENT_P is true if we are being called
7725 to process the Component_Size of GNAT_OBJECT. This is used for error
7726 message handling and to indicate to use the object size of GNU_TYPE.
7727 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7728 it means that a size of zero should be treated as an unspecified size. */
7731 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7732 enum tree_code kind, bool component_p, bool zero_ok)
7734 Node_Id gnat_error_node;
7735 tree type_size, size;
7737 /* Return 0 if no size was specified. */
7738 if (uint_size == No_Uint)
7741 /* Ignore a negative size since that corresponds to our back-annotation. */
7742 if (UI_Lt (uint_size, Uint_0))
7745 /* Find the node to use for errors. */
7746 if ((Ekind (gnat_object) == E_Component
7747 || Ekind (gnat_object) == E_Discriminant)
7748 && Present (Component_Clause (gnat_object)))
7749 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7750 else if (Present (Size_Clause (gnat_object)))
7751 gnat_error_node = Expression (Size_Clause (gnat_object));
7753 gnat_error_node = gnat_object;
7755 /* Get the size as a tree. Issue an error if a size was specified but
7756 cannot be represented in sizetype. */
7757 size = UI_To_gnu (uint_size, bitsizetype);
7758 if (TREE_OVERFLOW (size))
7761 post_error_ne ("component size of & is too large", gnat_error_node,
7764 post_error_ne ("size of & is too large", gnat_error_node,
7769 /* Ignore a zero size if it is not permitted. */
7770 if (!zero_ok && integer_zerop (size))
7773 /* The size of objects is always a multiple of a byte. */
7774 if (kind == VAR_DECL
7775 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7778 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7779 gnat_error_node, gnat_object);
7781 post_error_ne ("size for& is not a multiple of Storage_Unit",
7782 gnat_error_node, gnat_object);
7786 /* If this is an integral type or a packed array type, the front-end has
7787 verified the size, so we need not do it here (which would entail
7788 checking against the bounds). However, if this is an aliased object,
7789 it may not be smaller than the type of the object. */
7790 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7791 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7794 /* If the object is a record that contains a template, add the size of
7795 the template to the specified size. */
7796 if (TREE_CODE (gnu_type) == RECORD_TYPE
7797 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7798 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7800 if (kind == VAR_DECL
7801 /* If a type needs strict alignment, a component of this type in
7802 a packed record cannot be packed and thus uses the type size. */
7803 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7804 type_size = TYPE_SIZE (gnu_type);
7806 type_size = rm_size (gnu_type);
7808 /* Modify the size of the type to be that of the maximum size if it has a
7810 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7811 type_size = max_size (type_size, true);
7813 /* If this is an access type or a fat pointer, the minimum size is that given
7814 by the smallest integral mode that's valid for pointers. */
7815 if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type))
7817 enum machine_mode p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7818 while (!targetm.valid_pointer_mode (p_mode))
7819 p_mode = GET_MODE_WIDER_MODE (p_mode);
7820 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7823 /* If the size of the object is a constant, the new size must not be
7825 if (TREE_CODE (type_size) != INTEGER_CST
7826 || TREE_OVERFLOW (type_size)
7827 || tree_int_cst_lt (size, type_size))
7831 ("component size for& too small{, minimum allowed is ^}",
7832 gnat_error_node, gnat_object, type_size);
7835 ("size for& too small{, minimum allowed is ^}",
7836 gnat_error_node, gnat_object, type_size);
7844 /* Similarly, but both validate and process a value of RM size. This
7845 routine is only called for types. */
7848 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7850 Node_Id gnat_attr_node;
7851 tree old_size, size;
7853 /* Do nothing if no size was specified. */
7854 if (uint_size == No_Uint)
7857 /* Ignore a negative size since that corresponds to our back-annotation. */
7858 if (UI_Lt (uint_size, Uint_0))
7861 /* Only issue an error if a Value_Size clause was explicitly given.
7862 Otherwise, we'd be duplicating an error on the Size clause. */
7864 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7866 /* Get the size as a tree. Issue an error if a size was specified but
7867 cannot be represented in sizetype. */
7868 size = UI_To_gnu (uint_size, bitsizetype);
7869 if (TREE_OVERFLOW (size))
7871 if (Present (gnat_attr_node))
7872 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7877 /* Ignore a zero size unless a Value_Size clause exists, or a size clause
7878 exists, or this is an integer type, in which case the front-end will
7879 have always set it. */
7880 if (No (gnat_attr_node)
7881 && integer_zerop (size)
7882 && !Has_Size_Clause (gnat_entity)
7883 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7886 old_size = rm_size (gnu_type);
7888 /* If the old size is self-referential, get the maximum size. */
7889 if (CONTAINS_PLACEHOLDER_P (old_size))
7890 old_size = max_size (old_size, true);
7892 /* If the size of the object is a constant, the new size must not be smaller
7893 (the front-end has verified this for scalar and packed array types). */
7894 if (TREE_CODE (old_size) != INTEGER_CST
7895 || TREE_OVERFLOW (old_size)
7896 || (AGGREGATE_TYPE_P (gnu_type)
7897 && !(TREE_CODE (gnu_type) == ARRAY_TYPE
7898 && TYPE_PACKED_ARRAY_TYPE_P (gnu_type))
7899 && !(TYPE_IS_PADDING_P (gnu_type)
7900 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE
7901 && TYPE_PACKED_ARRAY_TYPE_P
7902 (TREE_TYPE (TYPE_FIELDS (gnu_type))))
7903 && tree_int_cst_lt (size, old_size)))
7905 if (Present (gnat_attr_node))
7907 ("Value_Size for& too small{, minimum allowed is ^}",
7908 gnat_attr_node, gnat_entity, old_size);
7912 /* Otherwise, set the RM size proper for integral types... */
7913 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7914 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7915 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7916 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7917 SET_TYPE_RM_SIZE (gnu_type, size);
7919 /* ...or the Ada size for record and union types. */
7920 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7921 || TREE_CODE (gnu_type) == UNION_TYPE
7922 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7923 && !TYPE_FAT_POINTER_P (gnu_type))
7924 SET_TYPE_ADA_SIZE (gnu_type, size);
7927 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7928 If TYPE is the best type, return it. Otherwise, make a new type. We
7929 only support new integral and pointer types. FOR_BIASED is true if
7930 we are making a biased type. */
7933 make_type_from_size (tree type, tree size_tree, bool for_biased)
7935 unsigned HOST_WIDE_INT size;
7939 /* If size indicates an error, just return TYPE to avoid propagating
7940 the error. Likewise if it's too large to represent. */
7941 if (!size_tree || !host_integerp (size_tree, 1))
7944 size = tree_low_cst (size_tree, 1);
7946 switch (TREE_CODE (type))
7951 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7952 && TYPE_BIASED_REPRESENTATION_P (type));
7954 /* Integer types with precision 0 are forbidden. */
7958 /* Only do something if the type is not a packed array type and
7959 doesn't already have the proper size. */
7960 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7961 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7964 biased_p |= for_biased;
7965 if (size > LONG_LONG_TYPE_SIZE)
7966 size = LONG_LONG_TYPE_SIZE;
7968 if (TYPE_UNSIGNED (type) || biased_p)
7969 new_type = make_unsigned_type (size);
7971 new_type = make_signed_type (size);
7972 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7973 SET_TYPE_RM_MIN_VALUE (new_type,
7974 convert (TREE_TYPE (new_type),
7975 TYPE_MIN_VALUE (type)));
7976 SET_TYPE_RM_MAX_VALUE (new_type,
7977 convert (TREE_TYPE (new_type),
7978 TYPE_MAX_VALUE (type)));
7979 /* Copy the name to show that it's essentially the same type and
7980 not a subrange type. */
7981 TYPE_NAME (new_type) = TYPE_NAME (type);
7982 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7983 SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
7987 /* Do something if this is a fat pointer, in which case we
7988 may need to return the thin pointer. */
7989 if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7991 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7992 if (!targetm.valid_pointer_mode (p_mode))
7995 build_pointer_type_for_mode
7996 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
8002 /* Only do something if this is a thin pointer, in which case we
8003 may need to return the fat pointer. */
8004 if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
8006 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
8016 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
8017 a type or object whose present alignment is ALIGN. If this alignment is
8018 valid, return it. Otherwise, give an error and return ALIGN. */
8021 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
8023 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
8024 unsigned int new_align;
8025 Node_Id gnat_error_node;
8027 /* Don't worry about checking alignment if alignment was not specified
8028 by the source program and we already posted an error for this entity. */
8029 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
8032 /* Post the error on the alignment clause if any. Note, for the implicit
8033 base type of an array type, the alignment clause is on the first
8035 if (Present (Alignment_Clause (gnat_entity)))
8036 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
8038 else if (Is_Itype (gnat_entity)
8039 && Is_Array_Type (gnat_entity)
8040 && Etype (gnat_entity) == gnat_entity
8041 && Present (Alignment_Clause (First_Subtype (gnat_entity))))
8043 Expression (Alignment_Clause (First_Subtype (gnat_entity)));
8046 gnat_error_node = gnat_entity;
8048 /* Within GCC, an alignment is an integer, so we must make sure a value is
8049 specified that fits in that range. Also, there is an upper bound to
8050 alignments we can support/allow. */
8051 if (!UI_Is_In_Int_Range (alignment)
8052 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
8053 post_error_ne_num ("largest supported alignment for& is ^",
8054 gnat_error_node, gnat_entity, max_allowed_alignment);
8055 else if (!(Present (Alignment_Clause (gnat_entity))
8056 && From_At_Mod (Alignment_Clause (gnat_entity)))
8057 && new_align * BITS_PER_UNIT < align)
8059 unsigned int double_align;
8060 bool is_capped_double, align_clause;
8062 /* If the default alignment of "double" or larger scalar types is
8063 specifically capped and the new alignment is above the cap, do
8064 not post an error and change the alignment only if there is an
8065 alignment clause; this makes it possible to have the associated
8066 GCC type overaligned by default for performance reasons. */
8067 if ((double_align = double_float_alignment) > 0)
8070 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
8072 = is_double_float_or_array (gnat_type, &align_clause);
8074 else if ((double_align = double_scalar_alignment) > 0)
8077 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
8079 = is_double_scalar_or_array (gnat_type, &align_clause);
8082 is_capped_double = align_clause = false;
8084 if (is_capped_double && new_align >= double_align)
8087 align = new_align * BITS_PER_UNIT;
8091 if (is_capped_double)
8092 align = double_align * BITS_PER_UNIT;
8094 post_error_ne_num ("alignment for& must be at least ^",
8095 gnat_error_node, gnat_entity,
8096 align / BITS_PER_UNIT);
8101 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
8102 if (new_align > align)
8109 /* Return the smallest alignment not less than SIZE. */
8112 ceil_alignment (unsigned HOST_WIDE_INT size)
8114 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
8117 /* Verify that OBJECT, a type or decl, is something we can implement
8118 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
8119 if we require atomic components. */
8122 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
8124 Node_Id gnat_error_point = gnat_entity;
8126 enum machine_mode mode;
8130 /* There are three case of what OBJECT can be. It can be a type, in which
8131 case we take the size, alignment and mode from the type. It can be a
8132 declaration that was indirect, in which case the relevant values are
8133 that of the type being pointed to, or it can be a normal declaration,
8134 in which case the values are of the decl. The code below assumes that
8135 OBJECT is either a type or a decl. */
8136 if (TYPE_P (object))
8138 /* If this is an anonymous base type, nothing to check. Error will be
8139 reported on the source type. */
8140 if (!Comes_From_Source (gnat_entity))
8143 mode = TYPE_MODE (object);
8144 align = TYPE_ALIGN (object);
8145 size = TYPE_SIZE (object);
8147 else if (DECL_BY_REF_P (object))
8149 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
8150 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
8151 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
8155 mode = DECL_MODE (object);
8156 align = DECL_ALIGN (object);
8157 size = DECL_SIZE (object);
8160 /* Consider all floating-point types atomic and any types that that are
8161 represented by integers no wider than a machine word. */
8162 if (GET_MODE_CLASS (mode) == MODE_FLOAT
8163 || ((GET_MODE_CLASS (mode) == MODE_INT
8164 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
8165 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
8168 /* For the moment, also allow anything that has an alignment equal
8169 to its size and which is smaller than a word. */
8170 if (size && TREE_CODE (size) == INTEGER_CST
8171 && compare_tree_int (size, align) == 0
8172 && align <= BITS_PER_WORD)
8175 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
8176 gnat_node = Next_Rep_Item (gnat_node))
8178 if (!comp_p && Nkind (gnat_node) == N_Pragma
8179 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
8181 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
8182 else if (comp_p && Nkind (gnat_node) == N_Pragma
8183 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
8184 == Pragma_Atomic_Components))
8185 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
8189 post_error_ne ("atomic access to component of & cannot be guaranteed",
8190 gnat_error_point, gnat_entity);
8192 post_error_ne ("atomic access to & cannot be guaranteed",
8193 gnat_error_point, gnat_entity);
8197 /* Helper for the intrin compatibility checks family. Evaluate whether
8198 two types are definitely incompatible. */
8201 intrin_types_incompatible_p (tree t1, tree t2)
8203 enum tree_code code;
8205 if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
8208 if (TYPE_MODE (t1) != TYPE_MODE (t2))
8211 if (TREE_CODE (t1) != TREE_CODE (t2))
8214 code = TREE_CODE (t1);
8220 return TYPE_PRECISION (t1) != TYPE_PRECISION (t2);
8223 case REFERENCE_TYPE:
8224 /* Assume designated types are ok. We'd need to account for char * and
8225 void * variants to do better, which could rapidly get messy and isn't
8226 clearly worth the effort. */
8236 /* Helper for intrin_profiles_compatible_p, to perform compatibility checks
8237 on the Ada/builtin argument lists for the INB binding. */
8240 intrin_arglists_compatible_p (intrin_binding_t * inb)
8242 tree ada_args = TYPE_ARG_TYPES (inb->ada_fntype);
8243 tree btin_args = TYPE_ARG_TYPES (inb->btin_fntype);
8245 /* Sequence position of the last argument we checked. */
8248 while (ada_args != 0 || btin_args != 0)
8250 tree ada_type, btin_type;
8252 /* If one list is shorter than the other, they fail to match. */
8253 if (ada_args == 0 || btin_args == 0)
8256 ada_type = TREE_VALUE (ada_args);
8257 btin_type = TREE_VALUE (btin_args);
8259 /* If we're done with the Ada args and not with the internal builtin
8260 args, or the other way around, complain. */
8261 if (ada_type == void_type_node
8262 && btin_type != void_type_node)
8264 post_error ("?Ada arguments list too short!", inb->gnat_entity);
8268 if (btin_type == void_type_node
8269 && ada_type != void_type_node)
8271 post_error_ne_num ("?Ada arguments list too long ('> ^)!",
8272 inb->gnat_entity, inb->gnat_entity, argpos);
8276 /* Otherwise, check that types match for the current argument. */
8278 if (intrin_types_incompatible_p (ada_type, btin_type))
8280 post_error_ne_num ("?intrinsic binding type mismatch on argument ^!",
8281 inb->gnat_entity, inb->gnat_entity, argpos);
8285 ada_args = TREE_CHAIN (ada_args);
8286 btin_args = TREE_CHAIN (btin_args);
8292 /* Helper for intrin_profiles_compatible_p, to perform compatibility checks
8293 on the Ada/builtin return values for the INB binding. */
8296 intrin_return_compatible_p (intrin_binding_t * inb)
8298 tree ada_return_type = TREE_TYPE (inb->ada_fntype);
8299 tree btin_return_type = TREE_TYPE (inb->btin_fntype);
8301 /* Accept function imported as procedure, common and convenient. */
8302 if (VOID_TYPE_P (ada_return_type)
8303 && !VOID_TYPE_P (btin_return_type))
8306 /* Check return types compatibility otherwise. Note that this
8307 handles void/void as well. */
8308 if (intrin_types_incompatible_p (btin_return_type, ada_return_type))
8310 post_error ("?intrinsic binding type mismatch on return value!",
8318 /* Check and return whether the Ada and gcc builtin profiles bound by INB are
8319 compatible. Issue relevant warnings when they are not.
8321 This is intended as a light check to diagnose the most obvious cases, not
8322 as a full fledged type compatibility predicate. It is the programmer's
8323 responsibility to ensure correctness of the Ada declarations in Imports,
8324 especially when binding straight to a compiler internal. */
8327 intrin_profiles_compatible_p (intrin_binding_t * inb)
8329 /* Check compatibility on return values and argument lists, each responsible
8330 for posting warnings as appropriate. Ensure use of the proper sloc for
8333 bool arglists_compatible_p, return_compatible_p;
8334 location_t saved_location = input_location;
8336 Sloc_to_locus (Sloc (inb->gnat_entity), &input_location);
8338 return_compatible_p = intrin_return_compatible_p (inb);
8339 arglists_compatible_p = intrin_arglists_compatible_p (inb);
8341 input_location = saved_location;
8343 return return_compatible_p && arglists_compatible_p;
8346 /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type
8347 and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the
8348 specified size for this field. POS_LIST is a position list describing
8349 the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied
8353 create_field_decl_from (tree old_field, tree field_type, tree record_type,
8354 tree size, tree pos_list,
8355 VEC(subst_pair,heap) *subst_list)
8357 tree t = TREE_VALUE (purpose_member (old_field, pos_list));
8358 tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2);
8359 unsigned int offset_align = tree_low_cst (TREE_VEC_ELT (t, 1), 1);
8360 tree new_pos, new_field;
8364 if (CONTAINS_PLACEHOLDER_P (pos))
8365 FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s)
8366 pos = SUBSTITUTE_IN_EXPR (pos, s->discriminant, s->replacement);
8368 /* If the position is now a constant, we can set it as the position of the
8369 field when we make it. Otherwise, we need to deal with it specially. */
8370 if (TREE_CONSTANT (pos))
8371 new_pos = bit_from_pos (pos, bitpos);
8373 new_pos = NULL_TREE;
8376 = create_field_decl (DECL_NAME (old_field), field_type, record_type,
8377 size, new_pos, DECL_PACKED (old_field),
8378 !DECL_NONADDRESSABLE_P (old_field));
8382 normalize_offset (&pos, &bitpos, offset_align);
8383 DECL_FIELD_OFFSET (new_field) = pos;
8384 DECL_FIELD_BIT_OFFSET (new_field) = bitpos;
8385 SET_DECL_OFFSET_ALIGN (new_field, offset_align);
8386 DECL_SIZE (new_field) = size;
8387 DECL_SIZE_UNIT (new_field)
8388 = convert (sizetype,
8389 size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node));
8390 layout_decl (new_field, DECL_OFFSET_ALIGN (new_field));
8393 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
8394 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
8395 DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field);
8396 TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field);
8401 /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */
8404 get_rep_part (tree record_type)
8406 tree field = TYPE_FIELDS (record_type);
8408 /* The REP part is the first field, internal, another record, and its name
8409 doesn't start with an underscore (i.e. is not generated by the FE). */
8410 if (DECL_INTERNAL_P (field)
8411 && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
8412 && IDENTIFIER_POINTER (DECL_NAME (field)) [0] != '_')
8418 /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */
8421 get_variant_part (tree record_type)
8425 /* The variant part is the only internal field that is a qualified union. */
8426 for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field))
8427 if (DECL_INTERNAL_P (field)
8428 && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE)
8434 /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is
8435 the list of variants to be used and RECORD_TYPE is the type of the parent.
8436 POS_LIST is a position list describing the layout of fields present in
8437 OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this
8441 create_variant_part_from (tree old_variant_part,
8442 VEC(variant_desc,heap) *variant_list,
8443 tree record_type, tree pos_list,
8444 VEC(subst_pair,heap) *subst_list)
8446 tree offset = DECL_FIELD_OFFSET (old_variant_part);
8447 tree old_union_type = TREE_TYPE (old_variant_part);
8448 tree new_union_type, new_variant_part;
8449 tree union_field_list = NULL_TREE;
8453 /* First create the type of the variant part from that of the old one. */
8454 new_union_type = make_node (QUAL_UNION_TYPE);
8455 TYPE_NAME (new_union_type) = DECL_NAME (TYPE_NAME (old_union_type));
8457 /* If the position of the variant part is constant, subtract it from the
8458 size of the type of the parent to get the new size. This manual CSE
8459 reduces the code size when not optimizing. */
8460 if (TREE_CODE (offset) == INTEGER_CST)
8462 tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part);
8463 tree first_bit = bit_from_pos (offset, bitpos);
8464 TYPE_SIZE (new_union_type)
8465 = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit);
8466 TYPE_SIZE_UNIT (new_union_type)
8467 = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type),
8468 byte_from_pos (offset, bitpos));
8469 SET_TYPE_ADA_SIZE (new_union_type,
8470 size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type),
8472 TYPE_ALIGN (new_union_type) = TYPE_ALIGN (old_union_type);
8473 relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY);
8476 copy_and_substitute_in_size (new_union_type, old_union_type, subst_list);
8478 /* Now finish up the new variants and populate the union type. */
8479 FOR_EACH_VEC_ELT_REVERSE (variant_desc, variant_list, ix, v)
8481 tree old_field = v->field, new_field;
8482 tree old_variant, old_variant_subpart, new_variant, field_list;
8484 /* Skip variants that don't belong to this nesting level. */
8485 if (DECL_CONTEXT (old_field) != old_union_type)
8488 /* Retrieve the list of fields already added to the new variant. */
8489 new_variant = v->record;
8490 field_list = TYPE_FIELDS (new_variant);
8492 /* If the old variant had a variant subpart, we need to create a new
8493 variant subpart and add it to the field list. */
8494 old_variant = v->type;
8495 old_variant_subpart = get_variant_part (old_variant);
8496 if (old_variant_subpart)
8498 tree new_variant_subpart
8499 = create_variant_part_from (old_variant_subpart, variant_list,
8500 new_variant, pos_list, subst_list);
8501 DECL_CHAIN (new_variant_subpart) = field_list;
8502 field_list = new_variant_subpart;
8505 /* Finish up the new variant and create the field. No need for debug
8506 info thanks to the XVS type. */
8507 finish_record_type (new_variant, nreverse (field_list), 2, false);
8508 compute_record_mode (new_variant);
8509 create_type_decl (TYPE_NAME (new_variant), new_variant, NULL,
8510 true, false, Empty);
8513 = create_field_decl_from (old_field, new_variant, new_union_type,
8514 TYPE_SIZE (new_variant),
8515 pos_list, subst_list);
8516 DECL_QUALIFIER (new_field) = v->qual;
8517 DECL_INTERNAL_P (new_field) = 1;
8518 DECL_CHAIN (new_field) = union_field_list;
8519 union_field_list = new_field;
8522 /* Finish up the union type and create the variant part. No need for debug
8523 info thanks to the XVS type. */
8524 finish_record_type (new_union_type, union_field_list, 2, false);
8525 compute_record_mode (new_union_type);
8526 create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL,
8527 true, false, Empty);
8530 = create_field_decl_from (old_variant_part, new_union_type, record_type,
8531 TYPE_SIZE (new_union_type),
8532 pos_list, subst_list);
8533 DECL_INTERNAL_P (new_variant_part) = 1;
8535 /* With multiple discriminants it is possible for an inner variant to be
8536 statically selected while outer ones are not; in this case, the list
8537 of fields of the inner variant is not flattened and we end up with a
8538 qualified union with a single member. Drop the useless container. */
8539 if (!DECL_CHAIN (union_field_list))
8541 DECL_CONTEXT (union_field_list) = record_type;
8542 DECL_FIELD_OFFSET (union_field_list)
8543 = DECL_FIELD_OFFSET (new_variant_part);
8544 DECL_FIELD_BIT_OFFSET (union_field_list)
8545 = DECL_FIELD_BIT_OFFSET (new_variant_part);
8546 SET_DECL_OFFSET_ALIGN (union_field_list,
8547 DECL_OFFSET_ALIGN (new_variant_part));
8548 new_variant_part = union_field_list;
8551 return new_variant_part;
8554 /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE,
8555 which are both RECORD_TYPE, after applying the substitutions described
8559 copy_and_substitute_in_size (tree new_type, tree old_type,
8560 VEC(subst_pair,heap) *subst_list)
8565 TYPE_SIZE (new_type) = TYPE_SIZE (old_type);
8566 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type);
8567 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type));
8568 TYPE_ALIGN (new_type) = TYPE_ALIGN (old_type);
8569 relate_alias_sets (new_type, old_type, ALIAS_SET_COPY);
8571 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type)))
8572 FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s)
8573 TYPE_SIZE (new_type)
8574 = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type),
8575 s->discriminant, s->replacement);
8577 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type)))
8578 FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s)
8579 TYPE_SIZE_UNIT (new_type)
8580 = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type),
8581 s->discriminant, s->replacement);
8583 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type)))
8584 FOR_EACH_VEC_ELT_REVERSE (subst_pair, subst_list, ix, s)
8586 (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type),
8587 s->discriminant, s->replacement));
8589 /* Finalize the size. */
8590 TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type));
8591 TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type));
8594 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
8595 type with all size expressions that contain F in a PLACEHOLDER_EXPR
8596 updated by replacing F with R.
8598 The function doesn't update the layout of the type, i.e. it assumes
8599 that the substitution is purely formal. That's why the replacement
8600 value R must itself contain a PLACEHOLDER_EXPR. */
8603 substitute_in_type (tree t, tree f, tree r)
8607 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
8609 switch (TREE_CODE (t))
8616 /* First the domain types of arrays. */
8617 if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t))
8618 || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t)))
8620 tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r);
8621 tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r);
8623 if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t))
8627 TYPE_GCC_MIN_VALUE (nt) = low;
8628 TYPE_GCC_MAX_VALUE (nt) = high;
8630 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t))
8632 (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
8637 /* Then the subtypes. */
8638 if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t))
8639 || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t)))
8641 tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r);
8642 tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r);
8644 if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t))
8648 SET_TYPE_RM_MIN_VALUE (nt, low);
8649 SET_TYPE_RM_MAX_VALUE (nt, high);
8657 nt = substitute_in_type (TREE_TYPE (t), f, r);
8658 if (nt == TREE_TYPE (t))
8661 return build_complex_type (nt);
8664 /* These should never show up here. */
8669 tree component = substitute_in_type (TREE_TYPE (t), f, r);
8670 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
8672 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
8675 nt = build_nonshared_array_type (component, domain);
8676 TYPE_ALIGN (nt) = TYPE_ALIGN (t);
8677 TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t);
8678 SET_TYPE_MODE (nt, TYPE_MODE (t));
8679 TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
8680 TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
8681 TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t);
8682 TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t);
8683 TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t);
8689 case QUAL_UNION_TYPE:
8691 bool changed_field = false;
8694 /* Start out with no fields, make new fields, and chain them
8695 in. If we haven't actually changed the type of any field,
8696 discard everything we've done and return the old type. */
8698 TYPE_FIELDS (nt) = NULL_TREE;
8700 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
8702 tree new_field = copy_node (field), new_n;
8704 new_n = substitute_in_type (TREE_TYPE (field), f, r);
8705 if (new_n != TREE_TYPE (field))
8707 TREE_TYPE (new_field) = new_n;
8708 changed_field = true;
8711 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
8712 if (new_n != DECL_FIELD_OFFSET (field))
8714 DECL_FIELD_OFFSET (new_field) = new_n;
8715 changed_field = true;
8718 /* Do the substitution inside the qualifier, if any. */
8719 if (TREE_CODE (t) == QUAL_UNION_TYPE)
8721 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
8722 if (new_n != DECL_QUALIFIER (field))
8724 DECL_QUALIFIER (new_field) = new_n;
8725 changed_field = true;
8729 DECL_CONTEXT (new_field) = nt;
8730 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field);
8732 DECL_CHAIN (new_field) = TYPE_FIELDS (nt);
8733 TYPE_FIELDS (nt) = new_field;
8739 TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt));
8740 TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
8741 TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
8742 SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
8751 /* Return the RM size of GNU_TYPE. This is the actual number of bits
8752 needed to represent the object. */
8755 rm_size (tree gnu_type)
8757 /* For integral types, we store the RM size explicitly. */
8758 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
8759 return TYPE_RM_SIZE (gnu_type);
8761 /* Return the RM size of the actual data plus the size of the template. */
8762 if (TREE_CODE (gnu_type) == RECORD_TYPE
8763 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
8765 size_binop (PLUS_EXPR,
8766 rm_size (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))),
8767 DECL_SIZE (TYPE_FIELDS (gnu_type)));
8769 /* For record types, we store the size explicitly. */
8770 if ((TREE_CODE (gnu_type) == RECORD_TYPE
8771 || TREE_CODE (gnu_type) == UNION_TYPE
8772 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
8773 && !TYPE_FAT_POINTER_P (gnu_type)
8774 && TYPE_ADA_SIZE (gnu_type))
8775 return TYPE_ADA_SIZE (gnu_type);
8777 /* For other types, this is just the size. */
8778 return TYPE_SIZE (gnu_type);
8781 /* Return the name to be used for GNAT_ENTITY. If a type, create a
8782 fully-qualified name, possibly with type information encoding.
8783 Otherwise, return the name. */
8786 get_entity_name (Entity_Id gnat_entity)
8788 Get_Encoded_Name (gnat_entity);
8789 return get_identifier_with_length (Name_Buffer, Name_Len);
8792 /* Return an identifier representing the external name to be used for
8793 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
8794 and the specified suffix. */
8797 create_concat_name (Entity_Id gnat_entity, const char *suffix)
8799 Entity_Kind kind = Ekind (gnat_entity);
8803 String_Template temp = {1, strlen (suffix)};
8804 Fat_Pointer fp = {suffix, &temp};
8805 Get_External_Name_With_Suffix (gnat_entity, fp);
8808 Get_External_Name (gnat_entity, 0);
8810 /* A variable using the Stdcall convention lives in a DLL. We adjust
8811 its name to use the jump table, the _imp__NAME contains the address
8812 for the NAME variable. */
8813 if ((kind == E_Variable || kind == E_Constant)
8814 && Has_Stdcall_Convention (gnat_entity))
8816 const int len = 6 + Name_Len;
8817 char *new_name = (char *) alloca (len + 1);
8818 strcpy (new_name, "_imp__");
8819 strcat (new_name, Name_Buffer);
8820 return get_identifier_with_length (new_name, len);
8823 return get_identifier_with_length (Name_Buffer, Name_Len);
8826 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
8827 string, return a new IDENTIFIER_NODE that is the concatenation of
8828 the name followed by "___" and the specified suffix. */
8831 concat_name (tree gnu_name, const char *suffix)
8833 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
8834 char *new_name = (char *) alloca (len + 1);
8835 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
8836 strcat (new_name, "___");
8837 strcat (new_name, suffix);
8838 return get_identifier_with_length (new_name, len);
8841 #include "gt-ada-decl.h"
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