1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2009, 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"
53 #ifndef MAX_FIXED_MODE_SIZE
54 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
57 /* Convention_Stdcall should be processed in a specific way on Windows targets
58 only. The macro below is a helper to avoid having to check for a Windows
59 specific attribute throughout this unit. */
61 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
62 #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall)
64 #define Has_Stdcall_Convention(E) (0)
67 /* Stack realignment for functions with foreign conventions is provided on a
68 per back-end basis now, as it is handled by the prologue expanders and not
69 as part of the function's body any more. It might be requested by way of a
70 dedicated function type attribute on the targets that support it.
72 We need a way to avoid setting the attribute on the targets that don't
73 support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose.
75 It is defined on targets where the circuitry is available, and indicates
76 whether the realignment is needed for 'main'. We use this to decide for
77 foreign subprograms as well.
79 It is not defined on targets where the circuitry is not implemented, and
80 we just never set the attribute in these cases.
82 Whether it is defined on all targets that would need it in theory is
83 not entirely clear. We currently trust the base GCC settings for this
86 #ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
87 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 0
92 struct incomplete *next;
97 /* These variables are used to defer recursively expanding incomplete types
98 while we are processing an array, a record or a subprogram type. */
99 static int defer_incomplete_level = 0;
100 static struct incomplete *defer_incomplete_list;
102 /* This variable is used to delay expanding From_With_Type types until the
104 static struct incomplete *defer_limited_with;
106 /* These variables are used to defer finalizing types. The element of the
107 list is the TYPE_DECL associated with the type. */
108 static int defer_finalize_level = 0;
109 static VEC (tree,heap) *defer_finalize_list;
111 /* A hash table used to cache the result of annotate_value. */
112 static GTY ((if_marked ("tree_int_map_marked_p"),
113 param_is (struct tree_int_map))) htab_t annotate_value_cache;
122 static void relate_alias_sets (tree, tree, enum alias_set_op);
124 static tree substitution_list (Entity_Id, Entity_Id, tree, bool);
125 static bool allocatable_size_p (tree, bool);
126 static void prepend_one_attribute_to (struct attrib **,
127 enum attr_type, tree, tree, Node_Id);
128 static void prepend_attributes (Entity_Id, struct attrib **);
129 static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool);
130 static bool is_variable_size (tree);
131 static tree elaborate_expression_1 (Node_Id, Entity_Id, tree, tree,
133 static tree make_packable_type (tree, bool);
134 static tree gnat_to_gnu_field (Entity_Id, tree, int, bool);
135 static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool,
137 static bool same_discriminant_p (Entity_Id, Entity_Id);
138 static bool array_type_has_nonaliased_component (Entity_Id, tree);
139 static bool compile_time_known_address_p (Node_Id);
140 static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
141 bool, bool, bool, bool);
142 static Uint annotate_value (tree);
143 static void annotate_rep (Entity_Id, tree);
144 static tree compute_field_positions (tree, tree, tree, tree, unsigned int);
145 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
146 static void set_rm_size (Uint, tree, Entity_Id);
147 static tree make_type_from_size (tree, tree, bool);
148 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
149 static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
150 static void check_ok_for_atomic (tree, Entity_Id, bool);
151 static int compatible_signatures_p (tree ftype1, tree ftype2);
152 static void rest_of_type_decl_compilation_no_defer (tree);
154 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
155 entity, return the equivalent GCC tree for that entity (a ..._DECL node)
156 and associate the ..._DECL node with the input GNAT defining identifier.
158 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
159 initial value (in GCC tree form). This is optional for a variable. For
160 a renamed entity, GNU_EXPR gives the object being renamed.
162 DEFINITION is nonzero if this call is intended for a definition. This is
163 used for separate compilation where it is necessary to know whether an
164 external declaration or a definition must be created if the GCC equivalent
165 was not created previously. The value of 1 is normally used for a nonzero
166 DEFINITION, but a value of 2 is used in special circumstances, defined in
170 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
172 /* Contains the kind of the input GNAT node. */
173 const Entity_Kind kind = Ekind (gnat_entity);
174 /* True if this is a type. */
175 const bool is_type = IN (kind, Type_Kind);
176 /* For a type, contains the equivalent GNAT node to be used in gigi. */
177 Entity_Id gnat_equiv_type = Empty;
178 /* Temporary used to walk the GNAT tree. */
180 /* Contains the GCC DECL node which is equivalent to the input GNAT node.
181 This node will be associated with the GNAT node by calling at the end
182 of the `switch' statement. */
183 tree gnu_decl = NULL_TREE;
184 /* Contains the GCC type to be used for the GCC node. */
185 tree gnu_type = NULL_TREE;
186 /* Contains the GCC size tree to be used for the GCC node. */
187 tree gnu_size = NULL_TREE;
188 /* Contains the GCC name to be used for the GCC node. */
189 tree gnu_entity_name;
190 /* True if we have already saved gnu_decl as a GNAT association. */
192 /* True if we incremented defer_incomplete_level. */
193 bool this_deferred = false;
194 /* True if we incremented force_global. */
195 bool this_global = false;
196 /* True if we should check to see if elaborated during processing. */
197 bool maybe_present = false;
198 /* True if we made GNU_DECL and its type here. */
199 bool this_made_decl = false;
200 /* True if debug info is requested for this entity. */
201 bool debug_info_p = (Needs_Debug_Info (gnat_entity)
202 || debug_info_level == DINFO_LEVEL_VERBOSE);
203 /* True if this entity is to be considered as imported. */
204 bool imported_p = (Is_Imported (gnat_entity)
205 && No (Address_Clause (gnat_entity)));
206 /* Size and alignment of the GCC node, if meaningful. */
207 unsigned int esize = 0, align = 0;
208 /* Contains the list of attributes directly attached to the entity. */
209 struct attrib *attr_list = NULL;
211 /* Since a use of an Itype is a definition, process it as such if it
212 is not in a with'ed unit. */
215 && Is_Itype (gnat_entity)
216 && !present_gnu_tree (gnat_entity)
217 && In_Extended_Main_Code_Unit (gnat_entity))
219 /* Ensure that we are in a subprogram mentioned in the Scope chain of
220 this entity, our current scope is global, or we encountered a task
221 or entry (where we can't currently accurately check scoping). */
222 if (!current_function_decl
223 || DECL_ELABORATION_PROC_P (current_function_decl))
225 process_type (gnat_entity);
226 return get_gnu_tree (gnat_entity);
229 for (gnat_temp = Scope (gnat_entity);
231 gnat_temp = Scope (gnat_temp))
233 if (Is_Type (gnat_temp))
234 gnat_temp = Underlying_Type (gnat_temp);
236 if (Ekind (gnat_temp) == E_Subprogram_Body)
238 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
240 if (IN (Ekind (gnat_temp), Subprogram_Kind)
241 && Present (Protected_Body_Subprogram (gnat_temp)))
242 gnat_temp = Protected_Body_Subprogram (gnat_temp);
244 if (Ekind (gnat_temp) == E_Entry
245 || Ekind (gnat_temp) == E_Entry_Family
246 || Ekind (gnat_temp) == E_Task_Type
247 || (IN (Ekind (gnat_temp), Subprogram_Kind)
248 && present_gnu_tree (gnat_temp)
249 && (current_function_decl
250 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
252 process_type (gnat_entity);
253 return get_gnu_tree (gnat_entity);
257 /* This abort means the Itype has an incorrect scope, i.e. that its
258 scope does not correspond to the subprogram it is declared in. */
262 /* If we've already processed this entity, return what we got last time.
263 If we are defining the node, we should not have already processed it.
264 In that case, we will abort below when we try to save a new GCC tree
265 for this object. We also need to handle the case of getting a dummy
266 type when a Full_View exists. */
267 if ((!definition || (is_type && imported_p))
268 && present_gnu_tree (gnat_entity))
270 gnu_decl = get_gnu_tree (gnat_entity);
272 if (TREE_CODE (gnu_decl) == TYPE_DECL
273 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
274 && IN (kind, Incomplete_Or_Private_Kind)
275 && Present (Full_View (gnat_entity)))
278 = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0);
279 save_gnu_tree (gnat_entity, NULL_TREE, false);
280 save_gnu_tree (gnat_entity, gnu_decl, false);
286 /* If this is a numeric or enumeral type, or an access type, a nonzero
287 Esize must be specified unless it was specified by the programmer. */
288 gcc_assert (!Unknown_Esize (gnat_entity)
289 || Has_Size_Clause (gnat_entity)
290 || (!IN (kind, Numeric_Kind)
291 && !IN (kind, Enumeration_Kind)
292 && (!IN (kind, Access_Kind)
293 || kind == E_Access_Protected_Subprogram_Type
294 || kind == E_Anonymous_Access_Protected_Subprogram_Type
295 || kind == E_Access_Subtype)));
297 /* The RM size must be specified for all discrete and fixed-point types. */
298 gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind)
299 && Unknown_RM_Size (gnat_entity)));
301 /* If we get here, it means we have not yet done anything with this entity.
302 If we are not defining it, it must be a type or an entity that is defined
303 elsewhere or externally, otherwise we should have defined it already. */
304 gcc_assert (definition
305 || type_annotate_only
307 || kind == E_Discriminant
308 || kind == E_Component
310 || (kind == E_Constant && Present (Full_View (gnat_entity)))
311 || Is_Public (gnat_entity));
313 /* Get the name of the entity and set up the line number and filename of
314 the original definition for use in any decl we make. */
315 gnu_entity_name = get_entity_name (gnat_entity);
316 Sloc_to_locus (Sloc (gnat_entity), &input_location);
318 /* For cases when we are not defining (i.e., we are referencing from
319 another compilation unit) public entities, show we are at global level
320 for the purpose of computing scopes. Don't do this for components or
321 discriminants since the relevant test is whether or not the record is
324 && kind != E_Component
325 && kind != E_Discriminant
326 && Is_Public (gnat_entity)
327 && !Is_Statically_Allocated (gnat_entity))
328 force_global++, this_global = true;
330 /* Handle any attributes directly attached to the entity. */
331 if (Has_Gigi_Rep_Item (gnat_entity))
332 prepend_attributes (gnat_entity, &attr_list);
334 /* Do some common processing for types. */
337 /* Compute the equivalent type to be used in gigi. */
338 gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
340 /* Machine_Attributes on types are expected to be propagated to
341 subtypes. The corresponding Gigi_Rep_Items are only attached
342 to the first subtype though, so we handle the propagation here. */
343 if (Base_Type (gnat_entity) != gnat_entity
344 && !Is_First_Subtype (gnat_entity)
345 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
346 prepend_attributes (First_Subtype (Base_Type (gnat_entity)),
349 /* Compute a default value for the size of the type. */
350 if (Known_Esize (gnat_entity)
351 && UI_Is_In_Int_Range (Esize (gnat_entity)))
353 unsigned int max_esize;
354 esize = UI_To_Int (Esize (gnat_entity));
356 if (IN (kind, Float_Kind))
357 max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
358 else if (IN (kind, Access_Kind))
359 max_esize = POINTER_SIZE * 2;
361 max_esize = LONG_LONG_TYPE_SIZE;
363 if (esize > max_esize)
367 esize = LONG_LONG_TYPE_SIZE;
373 /* If this is a use of a deferred constant without address clause,
374 get its full definition. */
376 && No (Address_Clause (gnat_entity))
377 && Present (Full_View (gnat_entity)))
380 = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
385 /* If we have an external constant that we are not defining, get the
386 expression that is was defined to represent. We may throw that
387 expression away later if it is not a constant. Do not retrieve the
388 expression if it is an aggregate or allocator, because in complex
389 instantiation contexts it may not be expanded */
391 && Present (Expression (Declaration_Node (gnat_entity)))
392 && !No_Initialization (Declaration_Node (gnat_entity))
393 && (Nkind (Expression (Declaration_Node (gnat_entity)))
395 && (Nkind (Expression (Declaration_Node (gnat_entity)))
397 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
399 /* Ignore deferred constant definitions without address clause since
400 they are processed fully in the front-end. If No_Initialization
401 is set, this is not a deferred constant but a constant whose value
402 is built manually. And constants that are renamings are handled
406 && No (Address_Clause (gnat_entity))
407 && !No_Initialization (Declaration_Node (gnat_entity))
408 && No (Renamed_Object (gnat_entity)))
410 gnu_decl = error_mark_node;
415 /* Ignore constant definitions already marked with the error node. See
416 the N_Object_Declaration case of gnat_to_gnu for the rationale. */
419 && present_gnu_tree (gnat_entity)
420 && get_gnu_tree (gnat_entity) == error_mark_node)
422 maybe_present = true;
429 /* We used to special case VMS exceptions here to directly map them to
430 their associated condition code. Since this code had to be masked
431 dynamically to strip off the severity bits, this caused trouble in
432 the GCC/ZCX case because the "type" pointers we store in the tables
433 have to be static. We now don't special case here anymore, and let
434 the regular processing take place, which leaves us with a regular
435 exception data object for VMS exceptions too. The condition code
436 mapping is taken care of by the front end and the bitmasking by the
443 /* The GNAT record where the component was defined. */
444 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
446 /* If the variable is an inherited record component (in the case of
447 extended record types), just return the inherited entity, which
448 must be a FIELD_DECL. Likewise for discriminants.
449 For discriminants of untagged records which have explicit
450 stored discriminants, return the entity for the corresponding
451 stored discriminant. Also use Original_Record_Component
452 if the record has a private extension. */
453 if (Present (Original_Record_Component (gnat_entity))
454 && Original_Record_Component (gnat_entity) != gnat_entity)
457 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
458 gnu_expr, definition);
463 /* If the enclosing record has explicit stored discriminants,
464 then it is an untagged record. If the Corresponding_Discriminant
465 is not empty then this must be a renamed discriminant and its
466 Original_Record_Component must point to the corresponding explicit
467 stored discriminant (i.e. we should have taken the previous
469 else if (Present (Corresponding_Discriminant (gnat_entity))
470 && Is_Tagged_Type (gnat_record))
472 /* A tagged record has no explicit stored discriminants. */
473 gcc_assert (First_Discriminant (gnat_record)
474 == First_Stored_Discriminant (gnat_record));
476 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
477 gnu_expr, definition);
482 else if (Present (CR_Discriminant (gnat_entity))
483 && type_annotate_only)
485 gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
486 gnu_expr, definition);
491 /* If the enclosing record has explicit stored discriminants, then
492 it is an untagged record. If the Corresponding_Discriminant
493 is not empty then this must be a renamed discriminant and its
494 Original_Record_Component must point to the corresponding explicit
495 stored discriminant (i.e. we should have taken the first
497 else if (Present (Corresponding_Discriminant (gnat_entity))
498 && (First_Discriminant (gnat_record)
499 != First_Stored_Discriminant (gnat_record)))
502 /* Otherwise, if we are not defining this and we have no GCC type
503 for the containing record, make one for it. Then we should
504 have made our own equivalent. */
505 else if (!definition && !present_gnu_tree (gnat_record))
507 /* ??? If this is in a record whose scope is a protected
508 type and we have an Original_Record_Component, use it.
509 This is a workaround for major problems in protected type
511 Entity_Id Scop = Scope (Scope (gnat_entity));
512 if ((Is_Protected_Type (Scop)
513 || (Is_Private_Type (Scop)
514 && Present (Full_View (Scop))
515 && Is_Protected_Type (Full_View (Scop))))
516 && Present (Original_Record_Component (gnat_entity)))
519 = gnat_to_gnu_entity (Original_Record_Component
526 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
527 gnu_decl = get_gnu_tree (gnat_entity);
533 /* Here we have no GCC type and this is a reference rather than a
534 definition. This should never happen. Most likely the cause is
535 reference before declaration in the gnat tree for gnat_entity. */
539 case E_Loop_Parameter:
540 case E_Out_Parameter:
543 /* Simple variables, loop variables, Out parameters, and exceptions. */
546 bool used_by_ref = false;
548 = ((kind == E_Constant || kind == E_Variable)
549 && Is_True_Constant (gnat_entity)
550 && !Treat_As_Volatile (gnat_entity)
551 && (((Nkind (Declaration_Node (gnat_entity))
552 == N_Object_Declaration)
553 && Present (Expression (Declaration_Node (gnat_entity))))
554 || Present (Renamed_Object (gnat_entity))));
555 bool inner_const_flag = const_flag;
556 bool static_p = Is_Statically_Allocated (gnat_entity);
557 bool mutable_p = false;
558 tree gnu_ext_name = NULL_TREE;
559 tree renamed_obj = NULL_TREE;
560 tree gnu_object_size;
562 if (Present (Renamed_Object (gnat_entity)) && !definition)
564 if (kind == E_Exception)
565 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
568 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
571 /* Get the type after elaborating the renamed object. */
572 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
574 /* For a debug renaming declaration, build a pure debug entity. */
575 if (Present (Debug_Renaming_Link (gnat_entity)))
578 gnu_decl = build_decl (VAR_DECL, gnu_entity_name, gnu_type);
579 /* The (MEM (CONST (0))) pattern is prescribed by STABS. */
580 if (global_bindings_p ())
581 addr = gen_rtx_CONST (VOIDmode, const0_rtx);
583 addr = stack_pointer_rtx;
584 SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
585 gnat_pushdecl (gnu_decl, gnat_entity);
589 /* If this is a loop variable, its type should be the base type.
590 This is because the code for processing a loop determines whether
591 a normal loop end test can be done by comparing the bounds of the
592 loop against those of the base type, which is presumed to be the
593 size used for computation. But this is not correct when the size
594 of the subtype is smaller than the type. */
595 if (kind == E_Loop_Parameter)
596 gnu_type = get_base_type (gnu_type);
598 /* Reject non-renamed objects whose types are unconstrained arrays or
599 any object whose type is a dummy type or VOID_TYPE. */
601 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
602 && No (Renamed_Object (gnat_entity)))
603 || TYPE_IS_DUMMY_P (gnu_type)
604 || TREE_CODE (gnu_type) == VOID_TYPE)
606 gcc_assert (type_annotate_only);
609 return error_mark_node;
612 /* If an alignment is specified, use it if valid. Note that
613 exceptions are objects but don't have alignments. We must do this
614 before we validate the size, since the alignment can affect the
616 if (kind != E_Exception && Known_Alignment (gnat_entity))
618 gcc_assert (Present (Alignment (gnat_entity)));
619 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
620 TYPE_ALIGN (gnu_type));
621 gnu_type = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
622 "PAD", false, definition, true);
625 /* If we are defining the object, see if it has a Size value and
626 validate it if so. If we are not defining the object and a Size
627 clause applies, simply retrieve the value. We don't want to ignore
628 the clause and it is expected to have been validated already. Then
629 get the new type, if any. */
631 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
632 gnat_entity, VAR_DECL, false,
633 Has_Size_Clause (gnat_entity));
634 else if (Has_Size_Clause (gnat_entity))
635 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
640 = make_type_from_size (gnu_type, gnu_size,
641 Has_Biased_Representation (gnat_entity));
643 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
644 gnu_size = NULL_TREE;
647 /* If this object has self-referential size, it must be a record with
648 a default value. We are supposed to allocate an object of the
649 maximum size in this case unless it is a constant with an
650 initializing expression, in which case we can get the size from
651 that. Note that the resulting size may still be a variable, so
652 this may end up with an indirect allocation. */
653 if (No (Renamed_Object (gnat_entity))
654 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
656 if (gnu_expr && kind == E_Constant)
658 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
659 if (CONTAINS_PLACEHOLDER_P (size))
661 /* If the initializing expression is itself a constant,
662 despite having a nominal type with self-referential
663 size, we can get the size directly from it. */
664 if (TREE_CODE (gnu_expr) == COMPONENT_REF
665 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
668 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
669 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
670 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
671 || DECL_READONLY_ONCE_ELAB
672 (TREE_OPERAND (gnu_expr, 0))))
673 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
676 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
681 /* We may have no GNU_EXPR because No_Initialization is
682 set even though there's an Expression. */
683 else if (kind == E_Constant
684 && (Nkind (Declaration_Node (gnat_entity))
685 == N_Object_Declaration)
686 && Present (Expression (Declaration_Node (gnat_entity))))
688 = TYPE_SIZE (gnat_to_gnu_type
690 (Expression (Declaration_Node (gnat_entity)))));
693 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
698 /* If the size is zero bytes, make it one byte since some linkers have
699 trouble with zero-sized objects. If the object will have a
700 template, that will make it nonzero so don't bother. Also avoid
701 doing that for an object renaming or an object with an address
702 clause, as we would lose useful information on the view size
703 (e.g. for null array slices) and we are not allocating the object
706 && integer_zerop (gnu_size)
707 && !TREE_OVERFLOW (gnu_size))
708 || (TYPE_SIZE (gnu_type)
709 && integer_zerop (TYPE_SIZE (gnu_type))
710 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
711 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
712 || !Is_Array_Type (Etype (gnat_entity)))
713 && No (Renamed_Object (gnat_entity))
714 && No (Address_Clause (gnat_entity)))
715 gnu_size = bitsize_unit_node;
717 /* If this is an object with no specified size and alignment, and
718 if either it is atomic or we are not optimizing alignment for
719 space and it is composite and not an exception, an Out parameter
720 or a reference to another object, and the size of its type is a
721 constant, set the alignment to the smallest one which is not
722 smaller than the size, with an appropriate cap. */
723 if (!gnu_size && align == 0
724 && (Is_Atomic (gnat_entity)
725 || (!Optimize_Alignment_Space (gnat_entity)
726 && kind != E_Exception
727 && kind != E_Out_Parameter
728 && Is_Composite_Type (Etype (gnat_entity))
729 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
731 && No (Renamed_Object (gnat_entity))
732 && No (Address_Clause (gnat_entity))))
733 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
735 /* No point in jumping through all the hoops needed in order
736 to support BIGGEST_ALIGNMENT if we don't really have to.
737 So we cap to the smallest alignment that corresponds to
738 a known efficient memory access pattern of the target. */
739 unsigned int align_cap = Is_Atomic (gnat_entity)
741 : get_mode_alignment (ptr_mode);
743 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
744 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
747 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
749 /* But make sure not to under-align the object. */
750 if (align <= TYPE_ALIGN (gnu_type))
753 /* And honor the minimum valid atomic alignment, if any. */
754 #ifdef MINIMUM_ATOMIC_ALIGNMENT
755 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
756 align = MINIMUM_ATOMIC_ALIGNMENT;
760 /* If the object is set to have atomic components, find the component
761 type and validate it.
763 ??? Note that we ignore Has_Volatile_Components on objects; it's
764 not at all clear what to do in that case. */
766 if (Has_Atomic_Components (gnat_entity))
768 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
769 ? TREE_TYPE (gnu_type) : gnu_type);
771 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
772 && TYPE_MULTI_ARRAY_P (gnu_inner))
773 gnu_inner = TREE_TYPE (gnu_inner);
775 check_ok_for_atomic (gnu_inner, gnat_entity, true);
778 /* Now check if the type of the object allows atomic access. Note
779 that we must test the type, even if this object has size and
780 alignment to allow such access, because we will be going
781 inside the padded record to assign to the object. We could fix
782 this by always copying via an intermediate value, but it's not
783 clear it's worth the effort. */
784 if (Is_Atomic (gnat_entity))
785 check_ok_for_atomic (gnu_type, gnat_entity, false);
787 /* If this is an aliased object with an unconstrained nominal subtype,
788 make a type that includes the template. */
789 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
790 && Is_Array_Type (Etype (gnat_entity))
791 && !type_annotate_only)
794 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
797 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
798 concat_name (gnu_entity_name,
802 #ifdef MINIMUM_ATOMIC_ALIGNMENT
803 /* If the size is a constant and no alignment is specified, force
804 the alignment to be the minimum valid atomic alignment. The
805 restriction on constant size avoids problems with variable-size
806 temporaries; if the size is variable, there's no issue with
807 atomic access. Also don't do this for a constant, since it isn't
808 necessary and can interfere with constant replacement. Finally,
809 do not do it for Out parameters since that creates an
810 size inconsistency with In parameters. */
811 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
812 && !FLOAT_TYPE_P (gnu_type)
813 && !const_flag && No (Renamed_Object (gnat_entity))
814 && !imported_p && No (Address_Clause (gnat_entity))
815 && kind != E_Out_Parameter
816 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
817 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
818 align = MINIMUM_ATOMIC_ALIGNMENT;
821 /* Make a new type with the desired size and alignment, if needed.
822 But do not take into account alignment promotions to compute the
823 size of the object. */
824 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
825 if (gnu_size || align > 0)
826 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
827 "PAD", false, definition,
828 gnu_size ? true : false);
830 /* If this is a renaming, avoid as much as possible to create a new
831 object. However, in several cases, creating it is required.
832 This processing needs to be applied to the raw expression so
833 as to make it more likely to rename the underlying object. */
834 if (Present (Renamed_Object (gnat_entity)))
836 bool create_normal_object = false;
838 /* If the renamed object had padding, strip off the reference
839 to the inner object and reset our type. */
840 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
841 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
843 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
844 /* Strip useless conversions around the object. */
845 || (TREE_CODE (gnu_expr) == NOP_EXPR
846 && gnat_types_compatible_p
847 (TREE_TYPE (gnu_expr),
848 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
850 gnu_expr = TREE_OPERAND (gnu_expr, 0);
851 gnu_type = TREE_TYPE (gnu_expr);
854 /* Case 1: If this is a constant renaming stemming from a function
855 call, treat it as a normal object whose initial value is what
856 is being renamed. RM 3.3 says that the result of evaluating a
857 function call is a constant object. As a consequence, it can
858 be the inner object of a constant renaming. In this case, the
859 renaming must be fully instantiated, i.e. it cannot be a mere
860 reference to (part of) an existing object. */
863 tree inner_object = gnu_expr;
864 while (handled_component_p (inner_object))
865 inner_object = TREE_OPERAND (inner_object, 0);
866 if (TREE_CODE (inner_object) == CALL_EXPR)
867 create_normal_object = true;
870 /* Otherwise, see if we can proceed with a stabilized version of
871 the renamed entity or if we need to make a new object. */
872 if (!create_normal_object)
874 tree maybe_stable_expr = NULL_TREE;
877 /* Case 2: If the renaming entity need not be materialized and
878 the renamed expression is something we can stabilize, use
879 that for the renaming. At the global level, we can only do
880 this if we know no SAVE_EXPRs need be made, because the
881 expression we return might be used in arbitrary conditional
882 branches so we must force the SAVE_EXPRs evaluation
883 immediately and this requires a function context. */
884 if (!Materialize_Entity (gnat_entity)
885 && (!global_bindings_p ()
886 || (staticp (gnu_expr)
887 && !TREE_SIDE_EFFECTS (gnu_expr))))
890 = maybe_stabilize_reference (gnu_expr, true, &stable);
894 gnu_decl = maybe_stable_expr;
895 /* ??? No DECL_EXPR is created so we need to mark
896 the expression manually lest it is shared. */
897 if (global_bindings_p ())
898 mark_visited (&gnu_decl);
899 save_gnu_tree (gnat_entity, gnu_decl, true);
904 /* The stabilization failed. Keep maybe_stable_expr
905 untouched here to let the pointer case below know
906 about that failure. */
909 /* Case 3: If this is a constant renaming and creating a
910 new object is allowed and cheap, treat it as a normal
911 object whose initial value is what is being renamed. */
913 && !Is_Composite_Type
914 (Underlying_Type (Etype (gnat_entity))))
917 /* Case 4: Make this into a constant pointer to the object we
918 are to rename and attach the object to the pointer if it is
919 something we can stabilize.
921 From the proper scope, attached objects will be referenced
922 directly instead of indirectly via the pointer to avoid
923 subtle aliasing problems with non-addressable entities.
924 They have to be stable because we must not evaluate the
925 variables in the expression every time the renaming is used.
926 The pointer is called a "renaming" pointer in this case.
928 In the rare cases where we cannot stabilize the renamed
929 object, we just make a "bare" pointer, and the renamed
930 entity is always accessed indirectly through it. */
933 gnu_type = build_reference_type (gnu_type);
934 inner_const_flag = TREE_READONLY (gnu_expr);
937 /* If the previous attempt at stabilizing failed, there
938 is no point in trying again and we reuse the result
939 without attaching it to the pointer. In this case it
940 will only be used as the initializing expression of
941 the pointer and thus needs no special treatment with
942 regard to multiple evaluations. */
943 if (maybe_stable_expr)
946 /* Otherwise, try to stabilize and attach the expression
947 to the pointer if the stabilization succeeds.
949 Note that this might introduce SAVE_EXPRs and we don't
950 check whether we're at the global level or not. This
951 is fine since we are building a pointer initializer and
952 neither the pointer nor the initializing expression can
953 be accessed before the pointer elaboration has taken
954 place in a correct program.
956 These SAVE_EXPRs will be evaluated at the right place
957 by either the evaluation of the initializer for the
958 non-global case or the elaboration code for the global
959 case, and will be attached to the elaboration procedure
960 in the latter case. */
964 = maybe_stabilize_reference (gnu_expr, true, &stable);
967 renamed_obj = maybe_stable_expr;
969 /* Attaching is actually performed downstream, as soon
970 as we have a VAR_DECL for the pointer we make. */
974 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
976 gnu_size = NULL_TREE;
982 /* Make a volatile version of this object's type if we are to make
983 the object volatile. We also interpret 13.3(19) conservatively
984 and disallow any optimizations for such a non-constant object. */
985 if ((Treat_As_Volatile (gnat_entity)
987 && (Is_Exported (gnat_entity)
988 || Is_Imported (gnat_entity)
989 || Present (Address_Clause (gnat_entity)))))
990 && !TYPE_VOLATILE (gnu_type))
991 gnu_type = build_qualified_type (gnu_type,
992 (TYPE_QUALS (gnu_type)
993 | TYPE_QUAL_VOLATILE));
995 /* If we are defining an aliased object whose nominal subtype is
996 unconstrained, the object is a record that contains both the
997 template and the object. If there is an initializer, it will
998 have already been converted to the right type, but we need to
999 create the template if there is no initializer. */
1002 && TREE_CODE (gnu_type) == RECORD_TYPE
1003 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1004 /* Beware that padding might have been introduced
1005 via maybe_pad_type above. */
1006 || (TYPE_IS_PADDING_P (gnu_type)
1007 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1009 && TYPE_CONTAINS_TEMPLATE_P
1010 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1013 = TYPE_IS_PADDING_P (gnu_type)
1014 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1015 : TYPE_FIELDS (gnu_type);
1018 = gnat_build_constructor
1022 build_template (TREE_TYPE (template_field),
1023 TREE_TYPE (TREE_CHAIN (template_field)),
1028 /* Convert the expression to the type of the object except in the
1029 case where the object's type is unconstrained or the object's type
1030 is a padded record whose field is of self-referential size. In
1031 the former case, converting will generate unnecessary evaluations
1032 of the CONSTRUCTOR to compute the size and in the latter case, we
1033 want to only copy the actual data. */
1035 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1036 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1037 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1038 && TYPE_IS_PADDING_P (gnu_type)
1039 && (CONTAINS_PLACEHOLDER_P
1040 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1041 gnu_expr = convert (gnu_type, gnu_expr);
1043 /* If this is a pointer and it does not have an initializing
1044 expression, initialize it to NULL, unless the object is
1047 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
1048 && !Is_Imported (gnat_entity) && !gnu_expr)
1049 gnu_expr = integer_zero_node;
1051 /* If we are defining the object and it has an Address clause, we must
1052 either get the address expression from the saved GCC tree for the
1053 object if it has a Freeze node, or elaborate the address expression
1054 here since the front-end has guaranteed that the elaboration has no
1055 effects in this case. */
1056 if (definition && Present (Address_Clause (gnat_entity)))
1059 = present_gnu_tree (gnat_entity)
1060 ? get_gnu_tree (gnat_entity)
1061 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1063 save_gnu_tree (gnat_entity, NULL_TREE, false);
1065 /* Ignore the size. It's either meaningless or was handled
1067 gnu_size = NULL_TREE;
1068 /* Convert the type of the object to a reference type that can
1069 alias everything as per 13.3(19). */
1071 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1072 gnu_address = convert (gnu_type, gnu_address);
1074 const_flag = !Is_Public (gnat_entity)
1075 || compile_time_known_address_p (Expression (Address_Clause
1078 /* If this is a deferred constant, the initializer is attached to
1080 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1083 (Expression (Declaration_Node (Full_View (gnat_entity))));
1085 /* If we don't have an initializing expression for the underlying
1086 variable, the initializing expression for the pointer is the
1087 specified address. Otherwise, we have to make a COMPOUND_EXPR
1088 to assign both the address and the initial value. */
1090 gnu_expr = gnu_address;
1093 = build2 (COMPOUND_EXPR, gnu_type,
1095 (MODIFY_EXPR, NULL_TREE,
1096 build_unary_op (INDIRECT_REF, NULL_TREE,
1102 /* If it has an address clause and we are not defining it, mark it
1103 as an indirect object. Likewise for Stdcall objects that are
1105 if ((!definition && Present (Address_Clause (gnat_entity)))
1106 || (Is_Imported (gnat_entity)
1107 && Has_Stdcall_Convention (gnat_entity)))
1109 /* Convert the type of the object to a reference type that can
1110 alias everything as per 13.3(19). */
1112 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1113 gnu_size = NULL_TREE;
1115 /* No point in taking the address of an initializing expression
1116 that isn't going to be used. */
1117 gnu_expr = NULL_TREE;
1119 /* If it has an address clause whose value is known at compile
1120 time, make the object a CONST_DECL. This will avoid a
1121 useless dereference. */
1122 if (Present (Address_Clause (gnat_entity)))
1124 Node_Id gnat_address
1125 = Expression (Address_Clause (gnat_entity));
1127 if (compile_time_known_address_p (gnat_address))
1129 gnu_expr = gnat_to_gnu (gnat_address);
1137 /* If we are at top level and this object is of variable size,
1138 make the actual type a hidden pointer to the real type and
1139 make the initializer be a memory allocation and initialization.
1140 Likewise for objects we aren't defining (presumed to be
1141 external references from other packages), but there we do
1142 not set up an initialization.
1144 If the object's size overflows, make an allocator too, so that
1145 Storage_Error gets raised. Note that we will never free
1146 such memory, so we presume it never will get allocated. */
1148 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1149 global_bindings_p () || !definition
1152 && ! allocatable_size_p (gnu_size,
1153 global_bindings_p () || !definition
1156 gnu_type = build_reference_type (gnu_type);
1157 gnu_size = NULL_TREE;
1161 /* In case this was a aliased object whose nominal subtype is
1162 unconstrained, the pointer above will be a thin pointer and
1163 build_allocator will automatically make the template.
1165 If we have a template initializer only (that we made above),
1166 pretend there is none and rely on what build_allocator creates
1167 again anyway. Otherwise (if we have a full initializer), get
1168 the data part and feed that to build_allocator.
1170 If we are elaborating a mutable object, tell build_allocator to
1171 ignore a possibly simpler size from the initializer, if any, as
1172 we must allocate the maximum possible size in this case. */
1176 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1178 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1179 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1182 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1184 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1185 && 1 == VEC_length (constructor_elt,
1186 CONSTRUCTOR_ELTS (gnu_expr)))
1190 = build_component_ref
1191 (gnu_expr, NULL_TREE,
1192 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1196 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1197 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1198 && !Is_Imported (gnat_entity))
1199 post_error ("?Storage_Error will be raised at run-time!",
1202 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1203 0, 0, gnat_entity, mutable_p);
1207 gnu_expr = NULL_TREE;
1212 /* If this object would go into the stack and has an alignment larger
1213 than the largest stack alignment the back-end can honor, resort to
1214 a variable of "aligning type". */
1215 if (!global_bindings_p () && !static_p && definition
1216 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1218 /* Create the new variable. No need for extra room before the
1219 aligned field as this is in automatic storage. */
1221 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1222 TYPE_SIZE_UNIT (gnu_type),
1223 BIGGEST_ALIGNMENT, 0);
1225 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1226 NULL_TREE, gnu_new_type, NULL_TREE, false,
1227 false, false, false, NULL, gnat_entity);
1229 /* Initialize the aligned field if we have an initializer. */
1232 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1234 (gnu_new_var, NULL_TREE,
1235 TYPE_FIELDS (gnu_new_type), false),
1239 /* And setup this entity as a reference to the aligned field. */
1240 gnu_type = build_reference_type (gnu_type);
1243 (ADDR_EXPR, gnu_type,
1244 build_component_ref (gnu_new_var, NULL_TREE,
1245 TYPE_FIELDS (gnu_new_type), false));
1247 gnu_size = NULL_TREE;
1253 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1254 | TYPE_QUAL_CONST));
1256 /* Convert the expression to the type of the object except in the
1257 case where the object's type is unconstrained or the object's type
1258 is a padded record whose field is of self-referential size. In
1259 the former case, converting will generate unnecessary evaluations
1260 of the CONSTRUCTOR to compute the size and in the latter case, we
1261 want to only copy the actual data. */
1263 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1264 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1265 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1266 && TYPE_IS_PADDING_P (gnu_type)
1267 && (CONTAINS_PLACEHOLDER_P
1268 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1269 gnu_expr = convert (gnu_type, gnu_expr);
1271 /* If this name is external or there was a name specified, use it,
1272 unless this is a VMS exception object since this would conflict
1273 with the symbol we need to export in addition. Don't use the
1274 Interface_Name if there is an address clause (see CD30005). */
1275 if (!Is_VMS_Exception (gnat_entity)
1276 && ((Present (Interface_Name (gnat_entity))
1277 && No (Address_Clause (gnat_entity)))
1278 || (Is_Public (gnat_entity)
1279 && (!Is_Imported (gnat_entity)
1280 || Is_Exported (gnat_entity)))))
1281 gnu_ext_name = create_concat_name (gnat_entity, NULL);
1283 /* If this is constant initialized to a static constant and the
1284 object has an aggregate type, force it to be statically
1285 allocated. This will avoid an initialization copy. */
1286 if (!static_p && const_flag
1287 && gnu_expr && TREE_CONSTANT (gnu_expr)
1288 && AGGREGATE_TYPE_P (gnu_type)
1289 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1290 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1291 && TYPE_IS_PADDING_P (gnu_type)
1292 && !host_integerp (TYPE_SIZE_UNIT
1293 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1296 gnu_decl = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1297 gnu_expr, const_flag,
1298 Is_Public (gnat_entity),
1299 imported_p || !definition,
1300 static_p, attr_list, gnat_entity);
1301 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1302 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1303 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1305 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1306 if (global_bindings_p ())
1308 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1309 record_global_renaming_pointer (gnu_decl);
1313 if (definition && DECL_SIZE_UNIT (gnu_decl)
1314 && get_block_jmpbuf_decl ()
1315 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1316 || (flag_stack_check == GENERIC_STACK_CHECK
1317 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1318 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1319 add_stmt_with_node (build_call_1_expr
1320 (update_setjmp_buf_decl,
1321 build_unary_op (ADDR_EXPR, NULL_TREE,
1322 get_block_jmpbuf_decl ())),
1325 /* If we are defining an Out parameter and we're not optimizing,
1326 create a fake PARM_DECL for debugging purposes and make it
1327 point to the VAR_DECL. Suppress debug info for the latter
1328 but make sure it will still live on the stack so it can be
1329 accessed from within the debugger through the PARM_DECL. */
1330 if (kind == E_Out_Parameter && definition && !optimize)
1332 tree param = create_param_decl (gnu_entity_name, gnu_type, false);
1333 gnat_pushdecl (param, gnat_entity);
1334 SET_DECL_VALUE_EXPR (param, gnu_decl);
1335 DECL_HAS_VALUE_EXPR_P (param) = 1;
1337 debug_info_p = false;
1339 DECL_IGNORED_P (param) = 1;
1340 TREE_ADDRESSABLE (gnu_decl) = 1;
1343 /* If this is a public constant or we're not optimizing and we're not
1344 making a VAR_DECL for it, make one just for export or debugger use.
1345 Likewise if the address is taken or if either the object or type is
1346 aliased. Make an external declaration for a reference, unless this
1347 is a Standard entity since there no real symbol at the object level
1349 if (TREE_CODE (gnu_decl) == CONST_DECL
1350 && (definition || Sloc (gnat_entity) > Standard_Location)
1351 && ((Is_Public (gnat_entity) && No (Address_Clause (gnat_entity)))
1353 || Address_Taken (gnat_entity)
1354 || Is_Aliased (gnat_entity)
1355 || Is_Aliased (Etype (gnat_entity))))
1358 = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1359 gnu_expr, true, Is_Public (gnat_entity),
1360 !definition, static_p, NULL,
1363 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1365 /* As debugging information will be generated for the variable,
1366 do not generate information for the constant. */
1367 DECL_IGNORED_P (gnu_decl) = 1;
1370 /* If this is declared in a block that contains a block with an
1371 exception handler, we must force this variable in memory to
1372 suppress an invalid optimization. */
1373 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1374 && Exception_Mechanism != Back_End_Exceptions)
1375 TREE_ADDRESSABLE (gnu_decl) = 1;
1377 gnu_type = TREE_TYPE (gnu_decl);
1379 /* Back-annotate Alignment and Esize of the object if not already
1380 known, except for when the object is actually a pointer to the
1381 real object, since alignment and size of a pointer don't have
1382 anything to do with those of the designated object. Note that
1383 we pick the values of the type, not those of the object, to
1384 shield ourselves from low-level platform-dependent adjustments
1385 like alignment promotion. This is both consistent with all the
1386 treatment above, where alignment and size are set on the type of
1387 the object and not on the object directly, and makes it possible
1388 to support confirming representation clauses in all cases. */
1390 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1391 Set_Alignment (gnat_entity,
1392 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
1394 if (!used_by_ref && Unknown_Esize (gnat_entity))
1396 if (TREE_CODE (gnu_type) == RECORD_TYPE
1397 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
1399 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
1401 Set_Esize (gnat_entity, annotate_value (gnu_object_size));
1407 /* Return a TYPE_DECL for "void" that we previously made. */
1408 gnu_decl = TYPE_NAME (void_type_node);
1411 case E_Enumeration_Type:
1412 /* A special case: for the types Character and Wide_Character in
1413 Standard, we do not list all the literals. So if the literals
1414 are not specified, make this an unsigned type. */
1415 if (No (First_Literal (gnat_entity)))
1417 gnu_type = make_unsigned_type (esize);
1418 TYPE_NAME (gnu_type) = gnu_entity_name;
1420 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1421 This is needed by the DWARF-2 back-end to distinguish between
1422 unsigned integer types and character types. */
1423 TYPE_STRING_FLAG (gnu_type) = 1;
1427 /* Normal case of non-character type or non-Standard character type. */
1429 /* Here we have a list of enumeral constants in First_Literal.
1430 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1431 the list to be placed into TYPE_FIELDS. Each node in the list
1432 is a TREE_LIST whose TREE_VALUE is the literal name and whose
1433 TREE_PURPOSE is the value of the literal. */
1435 Entity_Id gnat_literal;
1436 tree gnu_literal_list = NULL_TREE;
1438 if (Is_Unsigned_Type (gnat_entity))
1439 gnu_type = make_unsigned_type (esize);
1441 gnu_type = make_signed_type (esize);
1443 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1445 for (gnat_literal = First_Literal (gnat_entity);
1446 Present (gnat_literal);
1447 gnat_literal = Next_Literal (gnat_literal))
1449 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1452 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1453 gnu_type, gnu_value, true, false, false,
1454 false, NULL, gnat_literal);
1456 save_gnu_tree (gnat_literal, gnu_literal, false);
1457 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1458 gnu_value, gnu_literal_list);
1461 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1463 /* Note that the bounds are updated at the end of this function
1464 to avoid an infinite recursion since they refer to the type. */
1468 case E_Signed_Integer_Type:
1469 case E_Ordinary_Fixed_Point_Type:
1470 case E_Decimal_Fixed_Point_Type:
1471 /* For integer types, just make a signed type the appropriate number
1473 gnu_type = make_signed_type (esize);
1476 case E_Modular_Integer_Type:
1478 /* For modular types, make the unsigned type of the proper number
1479 of bits and then set up the modulus, if required. */
1480 tree gnu_modulus, gnu_high = NULL_TREE;
1482 /* Packed array types are supposed to be subtypes only. */
1483 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1485 gnu_type = make_unsigned_type (esize);
1487 /* Get the modulus in this type. If it overflows, assume it is because
1488 it is equal to 2**Esize. Note that there is no overflow checking
1489 done on unsigned type, so we detect the overflow by looking for
1490 a modulus of zero, which is otherwise invalid. */
1491 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1493 if (!integer_zerop (gnu_modulus))
1495 TYPE_MODULAR_P (gnu_type) = 1;
1496 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1497 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1498 convert (gnu_type, integer_one_node));
1501 /* If the upper bound is not maximal, make an extra subtype. */
1503 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1505 tree gnu_subtype = make_unsigned_type (esize);
1506 TYPE_MAX_VALUE (gnu_subtype) = gnu_high;
1507 TREE_TYPE (gnu_subtype) = gnu_type;
1508 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1509 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1510 gnu_type = gnu_subtype;
1515 case E_Signed_Integer_Subtype:
1516 case E_Enumeration_Subtype:
1517 case E_Modular_Integer_Subtype:
1518 case E_Ordinary_Fixed_Point_Subtype:
1519 case E_Decimal_Fixed_Point_Subtype:
1521 /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
1522 not want to call build_range_type since we would like each subtype
1523 node to be distinct. ??? Historically this was in preparation for
1524 when memory aliasing is implemented, but that's obsolete now given
1525 the call to relate_alias_sets below.
1527 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1528 this fact is used by the arithmetic conversion functions.
1530 We elaborate the Ancestor_Subtype if it is not in the current unit
1531 and one of our bounds is non-static. We do this to ensure consistent
1532 naming in the case where several subtypes share the same bounds, by
1533 elaborating the first such subtype first, thus using its name. */
1536 && Present (Ancestor_Subtype (gnat_entity))
1537 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1538 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1539 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1540 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1542 gnu_type = make_node (INTEGER_TYPE);
1543 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1545 /* This should be an unsigned type if the base type is unsigned or
1546 if the lower bound is constant and non-negative or if the type
1548 TYPE_UNSIGNED (gnu_type) = (Is_Unsigned_Type (Etype (gnat_entity))
1549 || Is_Unsigned_Type (gnat_entity)
1550 || Has_Biased_Representation (gnat_entity));
1552 /* Set the precision to the Esize except for bit-packed arrays and
1553 subtypes of Standard.Boolean. */
1554 if (Is_Packed_Array_Type (gnat_entity)
1555 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1556 esize = UI_To_Int (RM_Size (gnat_entity));
1557 else if (Is_Boolean_Type (gnat_entity))
1560 TYPE_PRECISION (gnu_type) = esize;
1562 TYPE_MIN_VALUE (gnu_type)
1563 = convert (TREE_TYPE (gnu_type),
1564 elaborate_expression (Type_Low_Bound (gnat_entity),
1566 get_identifier ("L"), definition, 1,
1567 Needs_Debug_Info (gnat_entity)));
1569 TYPE_MAX_VALUE (gnu_type)
1570 = convert (TREE_TYPE (gnu_type),
1571 elaborate_expression (Type_High_Bound (gnat_entity),
1573 get_identifier ("U"), definition, 1,
1574 Needs_Debug_Info (gnat_entity)));
1576 /* One of the above calls might have caused us to be elaborated,
1577 so don't blow up if so. */
1578 if (present_gnu_tree (gnat_entity))
1580 maybe_present = true;
1584 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1585 = Has_Biased_Representation (gnat_entity);
1587 layout_type (gnu_type);
1589 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
1590 TYPE_STUB_DECL (gnu_type)
1591 = create_type_stub_decl (gnu_entity_name, gnu_type);
1593 /* Inherit our alias set from what we're a subtype of. Subtypes
1594 are not different types and a pointer can designate any instance
1595 within a subtype hierarchy. */
1596 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1598 /* For a packed array, make the original array type a parallel type. */
1600 && Is_Packed_Array_Type (gnat_entity)
1601 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1602 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1604 (Original_Array_Type (gnat_entity)));
1606 /* If the type we are dealing with represents a bit-packed array,
1607 we need to have the bits left justified on big-endian targets
1608 and right justified on little-endian targets. We also need to
1609 ensure that when the value is read (e.g. for comparison of two
1610 such values), we only get the good bits, since the unused bits
1611 are uninitialized. Both goals are accomplished by wrapping up
1612 the modular type in an enclosing record type. */
1613 if (Is_Packed_Array_Type (gnat_entity)
1614 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1616 tree gnu_field_type, gnu_field;
1618 /* Set the RM size before wrapping up the type. */
1619 TYPE_RM_SIZE (gnu_type)
1620 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1621 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1622 gnu_field_type = gnu_type;
1624 gnu_type = make_node (RECORD_TYPE);
1625 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1627 /* Propagate the alignment of the modular type to the record.
1628 This means that bit-packed arrays have "ceil" alignment for
1629 their size, which may seem counter-intuitive but makes it
1630 possible to easily overlay them on modular types. */
1631 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1632 TYPE_PACKED (gnu_type) = 1;
1634 /* Create a stripped-down declaration of the original type, mainly
1636 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1637 debug_info_p, gnat_entity);
1639 /* Don't notify the field as "addressable", since we won't be taking
1640 it's address and it would prevent create_field_decl from making a
1642 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1643 gnu_field_type, gnu_type, 1, 0, 0, 0);
1645 /* Do not finalize it until after the parallel type is added. */
1646 finish_record_type (gnu_type, gnu_field, 0, true);
1647 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1649 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1651 /* Make the original array type a parallel type. */
1653 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1654 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1656 (Original_Array_Type (gnat_entity)));
1658 rest_of_record_type_compilation (gnu_type);
1661 /* If the type we are dealing with has got a smaller alignment than the
1662 natural one, we need to wrap it up in a record type and under-align
1663 the latter. We reuse the padding machinery for this purpose. */
1664 else if (Known_Alignment (gnat_entity)
1665 && UI_Is_In_Int_Range (Alignment (gnat_entity))
1666 && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
1667 && align < TYPE_ALIGN (gnu_type))
1669 tree gnu_field_type, gnu_field;
1671 /* Set the RM size before wrapping up the type. */
1672 TYPE_RM_SIZE (gnu_type)
1673 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1674 gnu_field_type = gnu_type;
1676 gnu_type = make_node (RECORD_TYPE);
1677 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1679 TYPE_ALIGN (gnu_type) = align;
1680 TYPE_PACKED (gnu_type) = 1;
1682 /* Create a stripped-down declaration of the original type, mainly
1684 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1685 debug_info_p, gnat_entity);
1687 /* Don't notify the field as "addressable", since we won't be taking
1688 it's address and it would prevent create_field_decl from making a
1690 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1691 gnu_field_type, gnu_type, 1, 0, 0, 0);
1693 finish_record_type (gnu_type, gnu_field, 0, false);
1694 TYPE_IS_PADDING_P (gnu_type) = 1;
1696 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1699 /* Otherwise reset the alignment lest we computed it above. */
1705 case E_Floating_Point_Type:
1706 /* If this is a VAX floating-point type, use an integer of the proper
1707 size. All the operations will be handled with ASM statements. */
1708 if (Vax_Float (gnat_entity))
1710 gnu_type = make_signed_type (esize);
1711 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1712 SET_TYPE_DIGITS_VALUE (gnu_type,
1713 UI_To_gnu (Digits_Value (gnat_entity),
1718 /* The type of the Low and High bounds can be our type if this is
1719 a type from Standard, so set them at the end of the function. */
1720 gnu_type = make_node (REAL_TYPE);
1721 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1722 layout_type (gnu_type);
1725 case E_Floating_Point_Subtype:
1726 if (Vax_Float (gnat_entity))
1728 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1734 && Present (Ancestor_Subtype (gnat_entity))
1735 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1736 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1737 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1738 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1741 gnu_type = make_node (REAL_TYPE);
1742 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1743 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1745 TYPE_MIN_VALUE (gnu_type)
1746 = convert (TREE_TYPE (gnu_type),
1747 elaborate_expression (Type_Low_Bound (gnat_entity),
1748 gnat_entity, get_identifier ("L"),
1750 Needs_Debug_Info (gnat_entity)));
1752 TYPE_MAX_VALUE (gnu_type)
1753 = convert (TREE_TYPE (gnu_type),
1754 elaborate_expression (Type_High_Bound (gnat_entity),
1755 gnat_entity, get_identifier ("U"),
1757 Needs_Debug_Info (gnat_entity)));
1759 /* One of the above calls might have caused us to be elaborated,
1760 so don't blow up if so. */
1761 if (present_gnu_tree (gnat_entity))
1763 maybe_present = true;
1767 layout_type (gnu_type);
1769 /* Inherit our alias set from what we're a subtype of, as for
1770 integer subtypes. */
1771 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1775 /* Array and String Types and Subtypes
1777 Unconstrained array types are represented by E_Array_Type and
1778 constrained array types are represented by E_Array_Subtype. There
1779 are no actual objects of an unconstrained array type; all we have
1780 are pointers to that type.
1782 The following fields are defined on array types and subtypes:
1784 Component_Type Component type of the array.
1785 Number_Dimensions Number of dimensions (an int).
1786 First_Index Type of first index. */
1791 Entity_Id gnat_ind_subtype;
1792 Entity_Id gnat_ind_base_subtype;
1793 int ndim = Number_Dimensions (gnat_entity);
1795 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1797 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1799 tree gnu_template_fields = NULL_TREE;
1800 tree gnu_template_type = make_node (RECORD_TYPE);
1801 tree gnu_template_reference;
1802 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1803 tree gnu_fat_type = make_node (RECORD_TYPE);
1804 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
1805 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree));
1806 tree gnu_max_size = size_one_node, gnu_max_size_unit;
1807 tree gnu_comp_size, tem;
1809 TYPE_NAME (gnu_template_type)
1810 = create_concat_name (gnat_entity, "XUB");
1812 /* Make a node for the array. If we are not defining the array
1813 suppress expanding incomplete types. */
1814 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1817 defer_incomplete_level++, this_deferred = true;
1819 /* Build the fat pointer type. Use a "void *" object instead of
1820 a pointer to the array type since we don't have the array type
1821 yet (it will reference the fat pointer via the bounds). */
1822 tem = chainon (chainon (NULL_TREE,
1823 create_field_decl (get_identifier ("P_ARRAY"),
1825 gnu_fat_type, 0, 0, 0, 0)),
1826 create_field_decl (get_identifier ("P_BOUNDS"),
1828 gnu_fat_type, 0, 0, 0, 0));
1830 /* Make sure we can put this into a register. */
1831 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1833 /* Do not finalize this record type since the types of its fields
1834 are still incomplete at this point. */
1835 finish_record_type (gnu_fat_type, tem, 0, true);
1836 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1838 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1839 is the fat pointer. This will be used to access the individual
1840 fields once we build them. */
1841 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1842 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1843 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1844 gnu_template_reference
1845 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1846 TREE_READONLY (gnu_template_reference) = 1;
1848 /* Now create the GCC type for each index and add the fields for
1849 that index to the template. */
1850 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
1851 gnat_ind_base_subtype
1852 = First_Index (Implementation_Base_Type (gnat_entity));
1853 index < ndim && index >= 0;
1855 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1856 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1858 char field_name[10];
1859 tree gnu_ind_subtype
1860 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1861 tree gnu_base_subtype
1862 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1864 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1866 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1867 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1869 /* Make the FIELD_DECLs for the minimum and maximum of this
1870 type and then make extractions of that field from the
1872 sprintf (field_name, "LB%d", index);
1873 gnu_min_field = create_field_decl (get_identifier (field_name),
1875 gnu_template_type, 0, 0, 0, 0);
1876 field_name[0] = 'U';
1877 gnu_max_field = create_field_decl (get_identifier (field_name),
1879 gnu_template_type, 0, 0, 0, 0);
1881 Sloc_to_locus (Sloc (gnat_entity),
1882 &DECL_SOURCE_LOCATION (gnu_min_field));
1883 Sloc_to_locus (Sloc (gnat_entity),
1884 &DECL_SOURCE_LOCATION (gnu_max_field));
1885 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1887 /* We can't use build_component_ref here since the template
1888 type isn't complete yet. */
1889 gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype,
1890 gnu_template_reference, gnu_min_field,
1892 gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype,
1893 gnu_template_reference, gnu_max_field,
1895 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1897 /* Make a range type with the new ranges, but using
1898 the Ada subtype. Then we convert to sizetype. */
1899 gnu_index_types[index]
1900 = create_index_type (convert (sizetype, gnu_min),
1901 convert (sizetype, gnu_max),
1902 build_range_type (gnu_ind_subtype,
1905 /* Update the maximum size of the array, in elements. */
1907 = size_binop (MULT_EXPR, gnu_max_size,
1908 size_binop (PLUS_EXPR, size_one_node,
1909 size_binop (MINUS_EXPR, gnu_base_max,
1912 TYPE_NAME (gnu_index_types[index])
1913 = create_concat_name (gnat_entity, field_name);
1916 for (index = 0; index < ndim; index++)
1918 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1920 /* Install all the fields into the template. */
1921 finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
1922 TYPE_READONLY (gnu_template_type) = 1;
1924 /* Now make the array of arrays and update the pointer to the array
1925 in the fat pointer. Note that it is the first field. */
1926 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1928 /* Try to get a smaller form of the component if needed. */
1929 if ((Is_Packed (gnat_entity)
1930 || Has_Component_Size_Clause (gnat_entity))
1931 && !Is_Bit_Packed_Array (gnat_entity)
1932 && !Has_Aliased_Components (gnat_entity)
1933 && !Strict_Alignment (Component_Type (gnat_entity))
1934 && TREE_CODE (tem) == RECORD_TYPE
1935 && !TYPE_IS_FAT_POINTER_P (tem)
1936 && host_integerp (TYPE_SIZE (tem), 1))
1937 tem = make_packable_type (tem, false);
1939 if (Has_Atomic_Components (gnat_entity))
1940 check_ok_for_atomic (tem, gnat_entity, true);
1942 /* Get and validate any specified Component_Size, but if Packed,
1943 ignore it since the front end will have taken care of it. */
1945 = validate_size (Component_Size (gnat_entity), tem,
1947 (Is_Bit_Packed_Array (gnat_entity)
1948 ? TYPE_DECL : VAR_DECL),
1949 true, Has_Component_Size_Clause (gnat_entity));
1951 /* If the component type is a RECORD_TYPE that has a self-referential
1952 size, use the maximum size. */
1954 && TREE_CODE (tem) == RECORD_TYPE
1955 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1956 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1958 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
1960 tree orig_tem = tem;
1961 unsigned int max_align;
1963 /* If an alignment is specified, use it as a cap on the component
1964 type so that it can be honored for the whole type. But ignore
1965 it for the original type of packed array types. */
1966 if (No (Packed_Array_Type (gnat_entity))
1967 && Known_Alignment (gnat_entity))
1968 max_align = validate_alignment (Alignment (gnat_entity),
1973 tem = make_type_from_size (tem, gnu_comp_size, false);
1974 if (max_align > 0 && TYPE_ALIGN (tem) > max_align)
1979 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1980 "C_PAD", false, definition, true);
1982 /* If a padding record was made, declare it now since it will
1983 never be declared otherwise. This is necessary to ensure
1984 that its subtrees are properly marked. */
1985 if (tem != orig_tem)
1986 create_type_decl (TYPE_NAME (tem), tem, NULL, true,
1987 debug_info_p, gnat_entity);
1990 if (Has_Volatile_Components (gnat_entity))
1991 tem = build_qualified_type (tem,
1992 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1994 /* If Component_Size is not already specified, annotate it with the
1995 size of the component. */
1996 if (Unknown_Component_Size (gnat_entity))
1997 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1999 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
2000 size_binop (MULT_EXPR, gnu_max_size,
2001 TYPE_SIZE_UNIT (tem)));
2002 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
2003 size_binop (MULT_EXPR,
2004 convert (bitsizetype,
2008 for (index = ndim - 1; index >= 0; index--)
2010 tem = build_array_type (tem, gnu_index_types[index]);
2011 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
2012 if (array_type_has_nonaliased_component (gnat_entity, tem))
2013 TYPE_NONALIASED_COMPONENT (tem) = 1;
2016 /* If an alignment is specified, use it if valid. But ignore it
2017 for the original type of packed array types. If the alignment
2018 was requested with an explicit alignment clause, state so. */
2019 if (No (Packed_Array_Type (gnat_entity))
2020 && Known_Alignment (gnat_entity))
2023 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2025 if (Present (Alignment_Clause (gnat_entity)))
2026 TYPE_USER_ALIGN (tem) = 1;
2029 TYPE_CONVENTION_FORTRAN_P (tem)
2030 = (Convention (gnat_entity) == Convention_Fortran);
2031 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2033 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2034 corresponding fat pointer. */
2035 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2036 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2037 SET_TYPE_MODE (gnu_type, BLKmode);
2038 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2039 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2041 /* If the maximum size doesn't overflow, use it. */
2042 if (TREE_CODE (gnu_max_size) == INTEGER_CST
2043 && !TREE_OVERFLOW (gnu_max_size))
2045 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
2046 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2047 && !TREE_OVERFLOW (gnu_max_size_unit))
2048 TYPE_SIZE_UNIT (tem)
2049 = size_binop (MIN_EXPR, gnu_max_size_unit,
2050 TYPE_SIZE_UNIT (tem));
2052 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2053 tem, NULL, !Comes_From_Source (gnat_entity),
2054 debug_info_p, gnat_entity);
2056 /* Give the fat pointer type a name. */
2057 create_type_decl (create_concat_name (gnat_entity, "XUP"),
2058 gnu_fat_type, NULL, true,
2059 debug_info_p, gnat_entity);
2061 /* Create the type to be used as what a thin pointer designates: an
2062 record type for the object and its template with the field offsets
2063 shifted to have the template at a negative offset. */
2064 tem = build_unc_object_type (gnu_template_type, tem,
2065 create_concat_name (gnat_entity, "XUT"));
2066 shift_unc_components_for_thin_pointers (tem);
2068 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2069 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2071 /* Give the thin pointer type a name. */
2072 create_type_decl (create_concat_name (gnat_entity, "XUX"),
2073 build_pointer_type (tem), NULL, true,
2074 debug_info_p, gnat_entity);
2078 case E_String_Subtype:
2079 case E_Array_Subtype:
2081 /* This is the actual data type for array variables. Multidimensional
2082 arrays are implemented in the gnu tree as arrays of arrays. Note
2083 that for the moment arrays which have sparse enumeration subtypes as
2084 index components create sparse arrays, which is obviously space
2085 inefficient but so much easier to code for now.
2087 Also note that the subtype never refers to the unconstrained
2088 array type, which is somewhat at variance with Ada semantics.
2090 First check to see if this is simply a renaming of the array
2091 type. If so, the result is the array type. */
2093 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2094 if (!Is_Constrained (gnat_entity))
2098 Entity_Id gnat_ind_subtype;
2099 Entity_Id gnat_ind_base_subtype;
2100 int dim = Number_Dimensions (gnat_entity);
2102 = (Convention (gnat_entity) == Convention_Fortran) ? dim - 1 : 0;
2104 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
2106 tree gnu_base_type = gnu_type;
2107 tree *gnu_index_type = (tree *) alloca (dim * sizeof (tree));
2108 tree gnu_max_size = size_one_node, gnu_max_size_unit;
2109 bool need_index_type_struct = false;
2110 bool max_overflow = false;
2112 /* First create the gnu types for each index. Create types for
2113 debugging information to point to the index types if the
2114 are not integer types, have variable bounds, or are
2115 wider than sizetype. */
2117 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
2118 gnat_ind_base_subtype
2119 = First_Index (Implementation_Base_Type (gnat_entity));
2120 index < dim && index >= 0;
2122 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
2123 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
2125 tree gnu_index_subtype
2126 = get_unpadded_type (Etype (gnat_ind_subtype));
2128 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
2130 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
2131 tree gnu_base_subtype
2132 = get_unpadded_type (Etype (gnat_ind_base_subtype));
2134 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
2136 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
2137 tree gnu_base_type = get_base_type (gnu_base_subtype);
2138 tree gnu_base_base_min
2139 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
2140 tree gnu_base_base_max
2141 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
2145 /* If the minimum and maximum values both overflow in
2146 SIZETYPE, but the difference in the original type
2147 does not overflow in SIZETYPE, ignore the overflow
2149 if ((TYPE_PRECISION (gnu_index_subtype)
2150 > TYPE_PRECISION (sizetype)
2151 || TYPE_UNSIGNED (gnu_index_subtype)
2152 != TYPE_UNSIGNED (sizetype))
2153 && TREE_CODE (gnu_min) == INTEGER_CST
2154 && TREE_CODE (gnu_max) == INTEGER_CST
2155 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2157 (fold_build2 (MINUS_EXPR, gnu_index_subtype,
2158 TYPE_MAX_VALUE (gnu_index_subtype),
2159 TYPE_MIN_VALUE (gnu_index_subtype))))
2161 TREE_OVERFLOW (gnu_min) = 0;
2162 TREE_OVERFLOW (gnu_max) = 0;
2163 if (tree_int_cst_lt (gnu_max, gnu_min))
2165 gnu_min = size_one_node;
2166 gnu_max = size_zero_node;
2171 /* Similarly, if the range is null, use bounds of 1..0 for
2172 the sizetype bounds. */
2173 else if ((TYPE_PRECISION (gnu_index_subtype)
2174 > TYPE_PRECISION (sizetype)
2175 || TYPE_UNSIGNED (gnu_index_subtype)
2176 != TYPE_UNSIGNED (sizetype))
2177 && TREE_CODE (gnu_min) == INTEGER_CST
2178 && TREE_CODE (gnu_max) == INTEGER_CST
2179 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2180 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
2181 TYPE_MIN_VALUE (gnu_index_subtype)))
2183 gnu_min = size_one_node;
2184 gnu_max = size_zero_node;
2188 /* See if the base array type is already flat. If it is, we
2189 are probably compiling an ACATS test, but it will cause the
2190 code below to malfunction if we don't handle it specially. */
2191 else if (TREE_CODE (gnu_base_min) == INTEGER_CST
2192 && TREE_CODE (gnu_base_max) == INTEGER_CST
2193 && !TREE_OVERFLOW (gnu_base_min)
2194 && !TREE_OVERFLOW (gnu_base_max)
2195 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
2197 gnu_min = size_one_node;
2198 gnu_max = size_zero_node;
2204 /* Now compute the size of this bound. We need to provide
2205 GCC with an upper bound to use but have to deal with the
2206 "superflat" case. There are three ways to do this. If
2207 we can prove that the array can never be superflat, we
2208 can just use the high bound of the index subtype. If we
2209 can prove that the low bound minus one can't overflow,
2210 we can do this as MAX (hb, lb - 1). Otherwise, we have
2211 to use the expression hb >= lb ? hb : lb - 1. */
2212 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2214 /* If gnu_high is now an integer which overflowed, the array
2215 cannot be superflat. */
2216 if (TREE_CODE (gnu_high) == INTEGER_CST
2217 && TREE_OVERFLOW (gnu_high))
2220 /* gnu_high cannot overflow if the subtype is unsigned since
2221 sizetype is signed, or if it is now a constant that hasn't
2223 else if (TYPE_UNSIGNED (gnu_base_subtype)
2224 || TREE_CODE (gnu_high) == INTEGER_CST)
2225 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2229 = build_cond_expr (sizetype,
2230 build_binary_op (GE_EXPR,
2236 gnu_index_type[index]
2237 = create_index_type (gnu_min, gnu_high, gnu_index_subtype,
2240 /* Also compute the maximum size of the array. Here we
2241 see if any constraint on the index type of the base type
2242 can be used in the case of self-referential bound on
2243 the index type of the subtype. We look for a non-"infinite"
2244 and non-self-referential bound from any type involved and
2245 handle each bound separately. */
2247 if ((TREE_CODE (gnu_min) == INTEGER_CST
2248 && !TREE_OVERFLOW (gnu_min)
2249 && !operand_equal_p (gnu_min, gnu_base_base_min, 0))
2250 || !CONTAINS_PLACEHOLDER_P (gnu_min)
2251 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2252 && !TREE_OVERFLOW (gnu_base_min)))
2253 gnu_base_min = gnu_min;
2255 if ((TREE_CODE (gnu_max) == INTEGER_CST
2256 && !TREE_OVERFLOW (gnu_max)
2257 && !operand_equal_p (gnu_max, gnu_base_base_max, 0))
2258 || !CONTAINS_PLACEHOLDER_P (gnu_max)
2259 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2260 && !TREE_OVERFLOW (gnu_base_max)))
2261 gnu_base_max = gnu_max;
2263 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2264 && TREE_OVERFLOW (gnu_base_min))
2265 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2266 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2267 && TREE_OVERFLOW (gnu_base_max))
2268 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2269 max_overflow = true;
2271 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
2272 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
2275 = size_binop (MAX_EXPR,
2276 size_binop (PLUS_EXPR, size_one_node,
2277 size_binop (MINUS_EXPR, gnu_base_max,
2281 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2282 && TREE_OVERFLOW (gnu_this_max))
2283 max_overflow = true;
2286 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2288 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
2289 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
2291 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
2292 || (TREE_TYPE (gnu_index_subtype)
2293 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
2295 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
2296 || (TYPE_PRECISION (gnu_index_subtype)
2297 > TYPE_PRECISION (sizetype)))
2298 need_index_type_struct = true;
2301 /* Then flatten: create the array of arrays. For an array type
2302 used to implement a packed array, get the component type from
2303 the original array type since the representation clauses that
2304 can affect it are on the latter. */
2305 if (Is_Packed_Array_Type (gnat_entity)
2306 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2308 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2309 for (index = dim - 1; index >= 0; index--)
2310 gnu_type = TREE_TYPE (gnu_type);
2312 /* One of the above calls might have caused us to be elaborated,
2313 so don't blow up if so. */
2314 if (present_gnu_tree (gnat_entity))
2316 maybe_present = true;
2324 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
2326 /* One of the above calls might have caused us to be elaborated,
2327 so don't blow up if so. */
2328 if (present_gnu_tree (gnat_entity))
2330 maybe_present = true;
2334 /* Try to get a smaller form of the component if needed. */
2335 if ((Is_Packed (gnat_entity)
2336 || Has_Component_Size_Clause (gnat_entity))
2337 && !Is_Bit_Packed_Array (gnat_entity)
2338 && !Has_Aliased_Components (gnat_entity)
2339 && !Strict_Alignment (Component_Type (gnat_entity))
2340 && TREE_CODE (gnu_type) == RECORD_TYPE
2341 && !TYPE_IS_FAT_POINTER_P (gnu_type)
2342 && host_integerp (TYPE_SIZE (gnu_type), 1))
2343 gnu_type = make_packable_type (gnu_type, false);
2345 /* Get and validate any specified Component_Size, but if Packed,
2346 ignore it since the front end will have taken care of it. */
2348 = validate_size (Component_Size (gnat_entity), gnu_type,
2350 (Is_Bit_Packed_Array (gnat_entity)
2351 ? TYPE_DECL : VAR_DECL), true,
2352 Has_Component_Size_Clause (gnat_entity));
2354 /* If the component type is a RECORD_TYPE that has a
2355 self-referential size, use the maximum size. */
2357 && TREE_CODE (gnu_type) == RECORD_TYPE
2358 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2359 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
2361 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
2363 tree orig_gnu_type = gnu_type;
2364 unsigned int max_align;
2366 /* If an alignment is specified, use it as a cap on the
2367 component type so that it can be honored for the whole
2368 type. But ignore it for the original type of packed
2370 if (No (Packed_Array_Type (gnat_entity))
2371 && Known_Alignment (gnat_entity))
2372 max_align = validate_alignment (Alignment (gnat_entity),
2378 = make_type_from_size (gnu_type, gnu_comp_size, false);
2379 if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
2380 gnu_type = orig_gnu_type;
2382 orig_gnu_type = gnu_type;
2384 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
2385 gnat_entity, "C_PAD", false,
2388 /* If a padding record was made, declare it now since it
2389 will never be declared otherwise. This is necessary
2390 to ensure that its subtrees are properly marked. */
2391 if (gnu_type != orig_gnu_type)
2392 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL,
2393 true, debug_info_p, gnat_entity);
2396 if (Has_Volatile_Components (Base_Type (gnat_entity)))
2397 gnu_type = build_qualified_type (gnu_type,
2398 (TYPE_QUALS (gnu_type)
2399 | TYPE_QUAL_VOLATILE));
2402 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2403 TYPE_SIZE_UNIT (gnu_type));
2404 gnu_max_size = size_binop (MULT_EXPR,
2405 convert (bitsizetype, gnu_max_size),
2406 TYPE_SIZE (gnu_type));
2408 for (index = dim - 1; index >= 0; index --)
2410 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
2411 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2412 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2413 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2416 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2417 TYPE_STUB_DECL (gnu_type)
2418 = create_type_stub_decl (gnu_entity_name, gnu_type);
2420 /* If we are at file level and this is a multi-dimensional array, we
2421 need to make a variable corresponding to the stride of the
2422 inner dimensions. */
2423 if (global_bindings_p () && dim > 1)
2425 tree gnu_str_name = get_identifier ("ST");
2428 for (gnu_arr_type = TREE_TYPE (gnu_type);
2429 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2430 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2431 gnu_str_name = concat_name (gnu_str_name, "ST"))
2433 tree eltype = TREE_TYPE (gnu_arr_type);
2435 TYPE_SIZE (gnu_arr_type)
2436 = elaborate_expression_1 (gnat_entity, gnat_entity,
2437 TYPE_SIZE (gnu_arr_type),
2438 gnu_str_name, definition, 0);
2440 /* ??? For now, store the size as a multiple of the
2441 alignment of the element type in bytes so that we
2442 can see the alignment from the tree. */
2443 TYPE_SIZE_UNIT (gnu_arr_type)
2445 (MULT_EXPR, sizetype,
2446 elaborate_expression_1
2447 (gnat_entity, gnat_entity,
2448 build_binary_op (EXACT_DIV_EXPR, sizetype,
2449 TYPE_SIZE_UNIT (gnu_arr_type),
2450 size_int (TYPE_ALIGN (eltype)
2452 concat_name (gnu_str_name, "A_U"), definition, 0),
2453 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2455 /* ??? create_type_decl is not invoked on the inner types so
2456 the MULT_EXPR node built above will never be marked. */
2457 mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type));
2461 /* If we need to write out a record type giving the names of the
2462 bounds for debugging purposes, do it now and make the record
2463 type a parallel type. This is not needed for a packed array
2464 since the bounds are conveyed by the original array type. */
2465 if (need_index_type_struct
2467 && !Is_Packed_Array_Type (gnat_entity))
2469 tree gnu_bound_rec = make_node (RECORD_TYPE);
2470 tree gnu_field_list = NULL_TREE;
2473 TYPE_NAME (gnu_bound_rec)
2474 = create_concat_name (gnat_entity, "XA");
2476 for (index = dim - 1; index >= 0; index--)
2478 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_type[index]);
2479 tree gnu_index_name = TYPE_NAME (gnu_index);
2481 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2482 gnu_index_name = DECL_NAME (gnu_index_name);
2484 /* Make sure to reference the types themselves, and not just
2485 their names, as the debugger may fall back on them. */
2486 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2488 0, NULL_TREE, NULL_TREE, 0);
2489 TREE_CHAIN (gnu_field) = gnu_field_list;
2490 gnu_field_list = gnu_field;
2493 finish_record_type (gnu_bound_rec, gnu_field_list, 0, false);
2494 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2497 /* Otherwise, for a packed array, make the original array type a
2499 else if (debug_info_p
2500 && Is_Packed_Array_Type (gnat_entity)
2501 && present_gnu_tree (Original_Array_Type (gnat_entity)))
2502 add_parallel_type (TYPE_STUB_DECL (gnu_type),
2504 (Original_Array_Type (gnat_entity)));
2506 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2507 = (Convention (gnat_entity) == Convention_Fortran);
2508 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2509 = (Is_Packed_Array_Type (gnat_entity)
2510 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2512 /* If our size depends on a placeholder and the maximum size doesn't
2513 overflow, use it. */
2514 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2515 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2516 && TREE_OVERFLOW (gnu_max_size))
2517 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2518 && TREE_OVERFLOW (gnu_max_size_unit))
2521 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2522 TYPE_SIZE (gnu_type));
2523 TYPE_SIZE_UNIT (gnu_type)
2524 = size_binop (MIN_EXPR, gnu_max_size_unit,
2525 TYPE_SIZE_UNIT (gnu_type));
2528 /* Set our alias set to that of our base type. This gives all
2529 array subtypes the same alias set. */
2530 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2533 /* If this is a packed type, make this type the same as the packed
2534 array type, but do some adjusting in the type first. */
2535 if (Present (Packed_Array_Type (gnat_entity)))
2537 Entity_Id gnat_index;
2538 tree gnu_inner_type;
2540 /* First finish the type we had been making so that we output
2541 debugging information for it. */
2543 = build_qualified_type (gnu_type,
2544 (TYPE_QUALS (gnu_type)
2545 | (TYPE_QUAL_VOLATILE
2546 * Treat_As_Volatile (gnat_entity))));
2549 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2550 !Comes_From_Source (gnat_entity),
2551 debug_info_p, gnat_entity);
2553 /* Save it as our equivalent in case the call below elaborates
2555 save_gnu_tree (gnat_entity, gnu_decl, false);
2557 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2559 this_made_decl = true;
2560 gnu_type = TREE_TYPE (gnu_decl);
2561 save_gnu_tree (gnat_entity, NULL_TREE, false);
2563 gnu_inner_type = gnu_type;
2564 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2565 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2566 || TYPE_IS_PADDING_P (gnu_inner_type)))
2567 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2569 /* We need to attach the index type to the type we just made so
2570 that the actual bounds can later be put into a template. */
2571 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2572 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2573 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2574 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2576 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2578 /* The TYPE_ACTUAL_BOUNDS field is overloaded with the
2579 TYPE_MODULUS for modular types so we make an extra
2580 subtype if necessary. */
2581 if (TYPE_MODULAR_P (gnu_inner_type))
2583 tree gnu_subtype = make_node (INTEGER_TYPE);
2584 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2585 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2587 TYPE_UNSIGNED (gnu_subtype) = 1;
2588 TYPE_PRECISION (gnu_subtype)
2589 = TYPE_PRECISION (gnu_inner_type);
2590 TYPE_MIN_VALUE (gnu_subtype)
2591 = TYPE_MIN_VALUE (gnu_inner_type);
2592 TYPE_MAX_VALUE (gnu_subtype)
2593 = TYPE_MAX_VALUE (gnu_inner_type);
2594 layout_type (gnu_subtype);
2596 gnu_inner_type = gnu_subtype;
2599 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2601 #ifdef ENABLE_CHECKING
2602 /* Check for other cases of overloading. */
2603 gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner_type));
2607 /* ??? This is necessary to make sure that the container is
2608 allocated with a null tree upfront; otherwise, it could
2609 be allocated with an uninitialized tree that is accessed
2610 before being set below. See ada-tree.h for details. */
2611 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2613 for (gnat_index = First_Index (gnat_entity);
2614 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2615 SET_TYPE_ACTUAL_BOUNDS
2617 tree_cons (NULL_TREE,
2618 get_unpadded_type (Etype (gnat_index)),
2619 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2621 if (Convention (gnat_entity) != Convention_Fortran)
2622 SET_TYPE_ACTUAL_BOUNDS
2624 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2626 if (TREE_CODE (gnu_type) == RECORD_TYPE
2627 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2628 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2632 /* Abort if packed array with no packed array type field set. */
2634 gcc_assert (!Is_Packed (gnat_entity));
2638 case E_String_Literal_Subtype:
2639 /* Create the type for a string literal. */
2641 Entity_Id gnat_full_type
2642 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2643 && Present (Full_View (Etype (gnat_entity)))
2644 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2645 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2646 tree gnu_string_array_type
2647 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2648 tree gnu_string_index_type
2649 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2650 (TYPE_DOMAIN (gnu_string_array_type))));
2651 tree gnu_lower_bound
2652 = convert (gnu_string_index_type,
2653 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2654 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2655 tree gnu_length = ssize_int (length - 1);
2656 tree gnu_upper_bound
2657 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2659 convert (gnu_string_index_type, gnu_length));
2661 = create_index_type (convert (sizetype, gnu_lower_bound),
2662 convert (sizetype, gnu_upper_bound),
2663 build_range_type (gnu_string_index_type,
2669 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2671 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2672 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2673 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2677 /* Record Types and Subtypes
2679 The following fields are defined on record types:
2681 Has_Discriminants True if the record has discriminants
2682 First_Discriminant Points to head of list of discriminants
2683 First_Entity Points to head of list of fields
2684 Is_Tagged_Type True if the record is tagged
2686 Implementation of Ada records and discriminated records:
2688 A record type definition is transformed into the equivalent of a C
2689 struct definition. The fields that are the discriminants which are
2690 found in the Full_Type_Declaration node and the elements of the
2691 Component_List found in the Record_Type_Definition node. The
2692 Component_List can be a recursive structure since each Variant of
2693 the Variant_Part of the Component_List has a Component_List.
2695 Processing of a record type definition comprises starting the list of
2696 field declarations here from the discriminants and the calling the
2697 function components_to_record to add the rest of the fields from the
2698 component list and return the gnu type node. The function
2699 components_to_record will call itself recursively as it traverses
2703 if (Has_Complex_Representation (gnat_entity))
2706 = build_complex_type
2708 (Etype (Defining_Entity
2709 (First (Component_Items
2712 (Declaration_Node (gnat_entity)))))))));
2718 Node_Id full_definition = Declaration_Node (gnat_entity);
2719 Node_Id record_definition = Type_Definition (full_definition);
2720 Entity_Id gnat_field;
2722 tree gnu_field_list = NULL_TREE;
2723 tree gnu_get_parent;
2724 /* Set PACKED in keeping with gnat_to_gnu_field. */
2726 = Is_Packed (gnat_entity)
2728 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2730 : (Known_Alignment (gnat_entity)
2731 || (Strict_Alignment (gnat_entity)
2732 && Known_Static_Esize (gnat_entity)))
2735 bool has_rep = Has_Specified_Layout (gnat_entity);
2736 bool all_rep = has_rep;
2738 = (Is_Tagged_Type (gnat_entity)
2739 && Nkind (record_definition) == N_Derived_Type_Definition);
2741 /* See if all fields have a rep clause. Stop when we find one
2743 for (gnat_field = First_Entity (gnat_entity);
2744 Present (gnat_field) && all_rep;
2745 gnat_field = Next_Entity (gnat_field))
2746 if ((Ekind (gnat_field) == E_Component
2747 || Ekind (gnat_field) == E_Discriminant)
2748 && No (Component_Clause (gnat_field)))
2751 /* If this is a record extension, go a level further to find the
2752 record definition. Also, verify we have a Parent_Subtype. */
2755 if (!type_annotate_only
2756 || Present (Record_Extension_Part (record_definition)))
2757 record_definition = Record_Extension_Part (record_definition);
2759 gcc_assert (type_annotate_only
2760 || Present (Parent_Subtype (gnat_entity)));
2763 /* Make a node for the record. If we are not defining the record,
2764 suppress expanding incomplete types. */
2765 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2766 TYPE_NAME (gnu_type) = gnu_entity_name;
2767 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2770 defer_incomplete_level++, this_deferred = true;
2772 /* If both a size and rep clause was specified, put the size in
2773 the record type now so that it can get the proper mode. */
2774 if (has_rep && Known_Esize (gnat_entity))
2775 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2777 /* Always set the alignment here so that it can be used to
2778 set the mode, if it is making the alignment stricter. If
2779 it is invalid, it will be checked again below. If this is to
2780 be Atomic, choose a default alignment of a word unless we know
2781 the size and it's smaller. */
2782 if (Known_Alignment (gnat_entity))
2783 TYPE_ALIGN (gnu_type)
2784 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2785 else if (Is_Atomic (gnat_entity))
2786 TYPE_ALIGN (gnu_type)
2787 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2788 /* If a type needs strict alignment, the minimum size will be the
2789 type size instead of the RM size (see validate_size). Cap the
2790 alignment, lest it causes this type size to become too large. */
2791 else if (Strict_Alignment (gnat_entity)
2792 && Known_Static_Esize (gnat_entity))
2794 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2795 unsigned int raw_align = raw_size & -raw_size;
2796 if (raw_align < BIGGEST_ALIGNMENT)
2797 TYPE_ALIGN (gnu_type) = raw_align;
2800 TYPE_ALIGN (gnu_type) = 0;
2802 /* If we have a Parent_Subtype, make a field for the parent. If
2803 this record has rep clauses, force the position to zero. */
2804 if (Present (Parent_Subtype (gnat_entity)))
2806 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2809 /* A major complexity here is that the parent subtype will
2810 reference our discriminants in its Discriminant_Constraint
2811 list. But those must reference the parent component of this
2812 record which is of the parent subtype we have not built yet!
2813 To break the circle we first build a dummy COMPONENT_REF which
2814 represents the "get to the parent" operation and initialize
2815 each of those discriminants to a COMPONENT_REF of the above
2816 dummy parent referencing the corresponding discriminant of the
2817 base type of the parent subtype. */
2818 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2819 build0 (PLACEHOLDER_EXPR, gnu_type),
2820 build_decl (FIELD_DECL, NULL_TREE,
2824 if (Has_Discriminants (gnat_entity))
2825 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2826 Present (gnat_field);
2827 gnat_field = Next_Stored_Discriminant (gnat_field))
2828 if (Present (Corresponding_Discriminant (gnat_field)))
2831 build3 (COMPONENT_REF,
2832 get_unpadded_type (Etype (gnat_field)),
2834 gnat_to_gnu_field_decl (Corresponding_Discriminant
2839 /* Then we build the parent subtype. If it has discriminants but
2840 the type itself has unknown discriminants, this means that it
2841 doesn't contain information about how the discriminants are
2842 derived from those of the ancestor type, so it cannot be used
2843 directly. Instead it is built by cloning the parent subtype
2844 of the underlying record view of the type, for which the above
2845 derivation of discriminants has been made explicit. */
2846 if (Has_Discriminants (gnat_parent)
2847 && Has_Unknown_Discriminants (gnat_entity))
2849 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2851 /* If we are defining the type, the underlying record
2852 view must already have been elaborated at this point.
2853 Otherwise do it now as its parent subtype cannot be
2854 technically elaborated on its own. */
2856 gcc_assert (present_gnu_tree (gnat_uview));
2858 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2860 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2862 /* Substitute the "get to the parent" of the type for that
2863 of its underlying record view in the cloned type. */
2864 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2865 Present (gnat_field);
2866 gnat_field = Next_Stored_Discriminant (gnat_field))
2867 if (Present (Corresponding_Discriminant (gnat_field)))
2869 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2871 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2872 gnu_get_parent, gnu_field, NULL_TREE);
2874 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2878 gnu_parent = gnat_to_gnu_type (gnat_parent);
2880 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2881 initially built. The discriminants must reference the fields
2882 of the parent subtype and not those of its base type for the
2883 placeholder machinery to properly work. */
2884 if (Has_Discriminants (gnat_entity))
2885 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2886 Present (gnat_field);
2887 gnat_field = Next_Stored_Discriminant (gnat_field))
2888 if (Present (Corresponding_Discriminant (gnat_field)))
2890 Entity_Id field = Empty;
2891 for (field = First_Stored_Discriminant (gnat_parent);
2893 field = Next_Stored_Discriminant (field))
2894 if (same_discriminant_p (gnat_field, field))
2896 gcc_assert (Present (field));
2897 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2898 = 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 (get_identifier
2908 (Get_Name_String (Name_uParent)),
2909 gnu_parent, gnu_type, 0,
2910 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2911 has_rep ? bitsize_zero_node : 0, 1);
2912 DECL_INTERNAL_P (gnu_field_list) = 1;
2913 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2916 /* Make the fields for the discriminants and put them into the record
2917 unless it's an Unchecked_Union. */
2918 if (Has_Discriminants (gnat_entity))
2919 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2920 Present (gnat_field);
2921 gnat_field = Next_Stored_Discriminant (gnat_field))
2923 /* If this is a record extension and this discriminant
2924 is the renaming of another discriminant, we've already
2925 handled the discriminant above. */
2926 if (Present (Parent_Subtype (gnat_entity))
2927 && Present (Corresponding_Discriminant (gnat_field)))
2931 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2933 /* Make an expression using a PLACEHOLDER_EXPR from the
2934 FIELD_DECL node just created and link that with the
2935 corresponding GNAT defining identifier. Then add to the
2937 save_gnu_tree (gnat_field,
2938 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2939 build0 (PLACEHOLDER_EXPR,
2940 DECL_CONTEXT (gnu_field)),
2941 gnu_field, NULL_TREE),
2944 if (!Is_Unchecked_Union (gnat_entity))
2946 TREE_CHAIN (gnu_field) = gnu_field_list;
2947 gnu_field_list = gnu_field;
2951 /* Put the discriminants into the record (backwards), so we can
2952 know the appropriate discriminant to use for the names of the
2954 TYPE_FIELDS (gnu_type) = gnu_field_list;
2956 /* Add the listed fields into the record and finish it up. */
2957 components_to_record (gnu_type, Component_List (record_definition),
2958 gnu_field_list, packed, definition, NULL,
2959 false, all_rep, false,
2960 Is_Unchecked_Union (gnat_entity));
2962 /* We used to remove the associations of the discriminants and
2963 _Parent for validity checking, but we may need them if there's
2964 Freeze_Node for a subtype used in this record. */
2965 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2966 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2968 /* If it is a tagged record force the type to BLKmode to insure
2969 that these objects will always be placed in memory. Do the
2970 same thing for limited record types. */
2971 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2972 SET_TYPE_MODE (gnu_type, BLKmode);
2974 /* Fill in locations of fields. */
2975 annotate_rep (gnat_entity, gnu_type);
2977 /* If there are any entities in the chain corresponding to
2978 components that we did not elaborate, ensure we elaborate their
2979 types if they are Itypes. */
2980 for (gnat_temp = First_Entity (gnat_entity);
2981 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2982 if ((Ekind (gnat_temp) == E_Component
2983 || Ekind (gnat_temp) == E_Discriminant)
2984 && Is_Itype (Etype (gnat_temp))
2985 && !present_gnu_tree (gnat_temp))
2986 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2990 case E_Class_Wide_Subtype:
2991 /* If an equivalent type is present, that is what we should use.
2992 Otherwise, fall through to handle this like a record subtype
2993 since it may have constraints. */
2994 if (gnat_equiv_type != gnat_entity)
2996 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2997 maybe_present = true;
3001 /* ... fall through ... */
3003 case E_Record_Subtype:
3005 /* If Cloned_Subtype is Present it means this record subtype has
3006 identical layout to that type or subtype and we should use
3007 that GCC type for this one. The front end guarantees that
3008 the component list is shared. */
3009 if (Present (Cloned_Subtype (gnat_entity)))
3011 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
3013 maybe_present = true;
3016 /* Otherwise, first ensure the base type is elaborated. Then, if we are
3017 changing the type, make a new type with each field having the
3018 type of the field in the new subtype but having the position
3019 computed by transforming every discriminant reference according
3020 to the constraints. We don't see any difference between
3021 private and nonprivate type here since derivations from types should
3022 have been deferred until the completion of the private type. */
3025 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
3030 defer_incomplete_level++, this_deferred = true;
3032 /* Get the base type initially for its alignment and sizes. But
3033 if it is a padded type, we do all the other work with the
3035 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
3037 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
3038 && TYPE_IS_PADDING_P (gnu_base_type))
3039 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3041 gnu_type = gnu_orig_type = gnu_base_type;
3043 if (present_gnu_tree (gnat_entity))
3045 maybe_present = true;
3049 /* When the type has discriminants, and these discriminants
3050 affect the shape of what it built, factor them in.
3052 If we are making a subtype of an Unchecked_Union (must be an
3053 Itype), just return the type.
3055 We can't just use Is_Constrained because private subtypes without
3056 discriminants of full types with discriminants with default
3057 expressions are Is_Constrained but aren't constrained! */
3059 if (IN (Ekind (gnat_base_type), Record_Kind)
3060 && !Is_For_Access_Subtype (gnat_entity)
3061 && !Is_Unchecked_Union (gnat_base_type)
3062 && Is_Constrained (gnat_entity)
3063 && Stored_Constraint (gnat_entity) != No_Elist
3064 && Present (Discriminant_Constraint (gnat_entity)))
3066 Entity_Id gnat_field;
3067 tree gnu_field_list = 0;
3069 = compute_field_positions (gnu_orig_type, NULL_TREE,
3070 size_zero_node, bitsize_zero_node,
3073 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
3077 gnu_type = make_node (RECORD_TYPE);
3078 TYPE_NAME (gnu_type) = gnu_entity_name;
3079 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3081 /* Set the size, alignment and alias set of the new type to
3082 match that of the old one, doing required substitutions.
3083 We do it this early because we need the size of the new
3084 type below to discard old fields if necessary. */
3085 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
3086 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
3087 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
3088 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
3089 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
3091 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3092 for (gnu_temp = gnu_subst_list;
3093 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3094 TYPE_SIZE (gnu_type)
3095 = substitute_in_expr (TYPE_SIZE (gnu_type),
3096 TREE_PURPOSE (gnu_temp),
3097 TREE_VALUE (gnu_temp));
3099 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
3100 for (gnu_temp = gnu_subst_list;
3101 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3102 TYPE_SIZE_UNIT (gnu_type)
3103 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
3104 TREE_PURPOSE (gnu_temp),
3105 TREE_VALUE (gnu_temp));
3107 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
3108 for (gnu_temp = gnu_subst_list;
3109 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3111 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3112 TREE_PURPOSE (gnu_temp),
3113 TREE_VALUE (gnu_temp)));
3115 for (gnat_field = First_Entity (gnat_entity);
3116 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3117 if ((Ekind (gnat_field) == E_Component
3118 || Ekind (gnat_field) == E_Discriminant)
3119 && (Underlying_Type (Scope (Original_Record_Component
3122 && (No (Corresponding_Discriminant (gnat_field))
3123 || !Is_Tagged_Type (gnat_base_type)))
3126 = gnat_to_gnu_field_decl (Original_Record_Component
3129 = TREE_VALUE (purpose_member (gnu_old_field,
3131 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3132 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3134 = gnat_to_gnu_type (Etype (gnat_field));
3135 tree gnu_size = TYPE_SIZE (gnu_field_type);
3136 tree gnu_new_pos = NULL_TREE;
3137 unsigned int offset_align
3138 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
3142 /* If there was a component clause, the field types must be
3143 the same for the type and subtype, so copy the data from
3144 the old field to avoid recomputation here. Also if the
3145 field is justified modular and the optimization in
3146 gnat_to_gnu_field was applied. */
3147 if (Present (Component_Clause
3148 (Original_Record_Component (gnat_field)))
3149 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3150 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3151 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3152 == TREE_TYPE (gnu_old_field)))
3154 gnu_size = DECL_SIZE (gnu_old_field);
3155 gnu_field_type = TREE_TYPE (gnu_old_field);
3158 /* If the old field was packed and of constant size, we
3159 have to get the old size here, as it might differ from
3160 what the Etype conveys and the latter might overlap
3161 onto the following field. Try to arrange the type for
3162 possible better packing along the way. */
3163 else if (DECL_PACKED (gnu_old_field)
3164 && TREE_CODE (DECL_SIZE (gnu_old_field))
3167 gnu_size = DECL_SIZE (gnu_old_field);
3168 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3169 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
3170 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3172 = make_packable_type (gnu_field_type, true);
3175 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3176 for (gnu_temp = gnu_subst_list;
3177 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3178 gnu_pos = substitute_in_expr (gnu_pos,
3179 TREE_PURPOSE (gnu_temp),
3180 TREE_VALUE (gnu_temp));
3182 /* If the position is now a constant, we can set it as the
3183 position of the field when we make it. Otherwise, we need
3184 to deal with it specially below. */
3185 if (TREE_CONSTANT (gnu_pos))
3187 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3189 /* Discard old fields that are outside the new type.
3190 This avoids confusing code scanning it to decide
3191 how to pass it to functions on some platforms. */
3192 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3193 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3194 && !integer_zerop (gnu_size)
3195 && !tree_int_cst_lt (gnu_new_pos,
3196 TYPE_SIZE (gnu_type)))
3202 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3203 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3204 !DECL_NONADDRESSABLE_P (gnu_old_field));
3206 if (!TREE_CONSTANT (gnu_pos))
3208 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3209 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3210 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3211 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3212 DECL_SIZE (gnu_field) = gnu_size;
3213 DECL_SIZE_UNIT (gnu_field)
3214 = convert (sizetype,
3215 size_binop (CEIL_DIV_EXPR, gnu_size,
3216 bitsize_unit_node));
3217 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3220 DECL_INTERNAL_P (gnu_field)
3221 = DECL_INTERNAL_P (gnu_old_field);
3222 SET_DECL_ORIGINAL_FIELD
3223 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3224 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3226 DECL_DISCRIMINANT_NUMBER (gnu_field)
3227 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3228 TREE_THIS_VOLATILE (gnu_field)
3229 = TREE_THIS_VOLATILE (gnu_old_field);
3231 /* To match the layout crafted in components_to_record, if
3232 this is the _Tag field, put it before any discriminants
3233 instead of after them as for all other fields. */
3234 if (Chars (gnat_field) == Name_uTag)
3235 gnu_field_list = chainon (gnu_field_list, gnu_field);
3238 TREE_CHAIN (gnu_field) = gnu_field_list;
3239 gnu_field_list = gnu_field;
3242 save_gnu_tree (gnat_field, gnu_field, false);
3245 /* Now go through the entities again looking for Itypes that
3246 we have not elaborated but should (e.g., Etypes of fields
3247 that have Original_Components). */
3248 for (gnat_field = First_Entity (gnat_entity);
3249 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3250 if ((Ekind (gnat_field) == E_Discriminant
3251 || Ekind (gnat_field) == E_Component)
3252 && !present_gnu_tree (Etype (gnat_field)))
3253 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3255 /* Do not finalize it since we're going to modify it below. */
3256 gnu_field_list = nreverse (gnu_field_list);
3257 finish_record_type (gnu_type, gnu_field_list, 2, true);
3259 /* Finalize size and mode. */
3260 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3261 TYPE_SIZE_UNIT (gnu_type)
3262 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3264 compute_record_mode (gnu_type);
3266 /* Fill in locations of fields. */
3267 annotate_rep (gnat_entity, gnu_type);
3269 /* We've built a new type, make an XVS type to show what this
3270 is a subtype of. Some debuggers require the XVS type to be
3271 output first, so do it in that order. */
3274 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3275 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
3277 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
3278 gnu_orig_name = DECL_NAME (gnu_orig_name);
3280 TYPE_NAME (gnu_subtype_marker)
3281 = create_concat_name (gnat_entity, "XVS");
3282 finish_record_type (gnu_subtype_marker,
3283 create_field_decl (gnu_orig_name,
3290 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3291 gnu_subtype_marker);
3294 /* Now we can finalize it. */
3295 rest_of_record_type_compilation (gnu_type);
3298 /* Otherwise, go down all the components in the new type and
3299 make them equivalent to those in the base type. */
3301 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3302 gnat_temp = Next_Entity (gnat_temp))
3303 if ((Ekind (gnat_temp) == E_Discriminant
3304 && !Is_Unchecked_Union (gnat_base_type))
3305 || Ekind (gnat_temp) == E_Component)
3306 save_gnu_tree (gnat_temp,
3307 gnat_to_gnu_field_decl
3308 (Original_Record_Component (gnat_temp)), false);
3312 case E_Access_Subprogram_Type:
3313 /* Use the special descriptor type for dispatch tables if needed,
3314 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3315 Note that we are only required to do so for static tables in
3316 order to be compatible with the C++ ABI, but Ada 2005 allows
3317 to extend library level tagged types at the local level so
3318 we do it in the non-static case as well. */
3319 if (TARGET_VTABLE_USES_DESCRIPTORS
3320 && Is_Dispatch_Table_Entity (gnat_entity))
3322 gnu_type = fdesc_type_node;
3323 gnu_size = TYPE_SIZE (gnu_type);
3327 /* ... fall through ... */
3329 case E_Anonymous_Access_Subprogram_Type:
3330 /* If we are not defining this entity, and we have incomplete
3331 entities being processed above us, make a dummy type and
3332 fill it in later. */
3333 if (!definition && defer_incomplete_level != 0)
3335 struct incomplete *p
3336 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3339 = build_pointer_type
3340 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3341 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3342 !Comes_From_Source (gnat_entity),
3343 debug_info_p, gnat_entity);
3344 this_made_decl = true;
3345 gnu_type = TREE_TYPE (gnu_decl);
3346 save_gnu_tree (gnat_entity, gnu_decl, false);
3349 p->old_type = TREE_TYPE (gnu_type);
3350 p->full_type = Directly_Designated_Type (gnat_entity);
3351 p->next = defer_incomplete_list;
3352 defer_incomplete_list = p;
3356 /* ... fall through ... */
3358 case E_Allocator_Type:
3360 case E_Access_Attribute_Type:
3361 case E_Anonymous_Access_Type:
3362 case E_General_Access_Type:
3364 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3365 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3366 bool is_from_limited_with
3367 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3368 && From_With_Type (gnat_desig_equiv));
3370 /* Get the "full view" of this entity. If this is an incomplete
3371 entity from a limited with, treat its non-limited view as the full
3372 view. Otherwise, if this is an incomplete or private type, use the
3373 full view. In the former case, we might point to a private type,
3374 in which case, we need its full view. Also, we want to look at the
3375 actual type used for the representation, so this takes a total of
3377 Entity_Id gnat_desig_full_direct_first
3378 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3379 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3380 ? Full_View (gnat_desig_equiv) : Empty));
3381 Entity_Id gnat_desig_full_direct
3382 = ((is_from_limited_with
3383 && Present (gnat_desig_full_direct_first)
3384 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3385 ? Full_View (gnat_desig_full_direct_first)
3386 : gnat_desig_full_direct_first);
3387 Entity_Id gnat_desig_full
3388 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3390 /* This the type actually used to represent the designated type,
3391 either gnat_desig_full or gnat_desig_equiv. */
3392 Entity_Id gnat_desig_rep;
3394 /* True if this is a pointer to an unconstrained array. */
3395 bool is_unconstrained_array;
3397 /* We want to know if we'll be seeing the freeze node for any
3398 incomplete type we may be pointing to. */
3400 = (Present (gnat_desig_full)
3401 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3402 : In_Extended_Main_Code_Unit (gnat_desig_type));
3404 /* True if we make a dummy type here. */
3405 bool got_fat_p = false;
3406 /* True if the dummy is a fat pointer. */
3407 bool made_dummy = false;
3408 tree gnu_desig_type = NULL_TREE;
3409 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3411 if (!targetm.valid_pointer_mode (p_mode))
3414 /* If either the designated type or its full view is an unconstrained
3415 array subtype, replace it with the type it's a subtype of. This
3416 avoids problems with multiple copies of unconstrained array types.
3417 Likewise, if the designated type is a subtype of an incomplete
3418 record type, use the parent type to avoid order of elaboration
3419 issues. This can lose some code efficiency, but there is no
3421 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3422 && ! Is_Constrained (gnat_desig_equiv))
3423 gnat_desig_equiv = Etype (gnat_desig_equiv);
3424 if (Present (gnat_desig_full)
3425 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3426 && ! Is_Constrained (gnat_desig_full))
3427 || (Ekind (gnat_desig_full) == E_Record_Subtype
3428 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3429 gnat_desig_full = Etype (gnat_desig_full);
3431 /* Now set the type that actually marks the representation of
3432 the designated type and also flag whether we have a unconstrained
3434 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3435 is_unconstrained_array
3436 = (Is_Array_Type (gnat_desig_rep)
3437 && ! Is_Constrained (gnat_desig_rep));
3439 /* If we are pointing to an incomplete type whose completion is an
3440 unconstrained array, make a fat pointer type. The two types in our
3441 fields will be pointers to dummy nodes and will be replaced in
3442 update_pointer_to. Similarly, if the type itself is a dummy type or
3443 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3444 in case we have any thin pointers to it. */
3445 if (is_unconstrained_array
3446 && (Present (gnat_desig_full)
3447 || (present_gnu_tree (gnat_desig_equiv)
3448 && TYPE_IS_DUMMY_P (TREE_TYPE
3449 (get_gnu_tree (gnat_desig_equiv))))
3450 || (No (gnat_desig_full) && ! in_main_unit
3451 && defer_incomplete_level != 0
3452 && ! present_gnu_tree (gnat_desig_equiv))
3453 || (in_main_unit && is_from_limited_with
3454 && Present (Freeze_Node (gnat_desig_rep)))))
3458 if (present_gnu_tree (gnat_desig_rep))
3459 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3462 gnu_old = make_dummy_type (gnat_desig_rep);
3464 /* Show the dummy we get will be a fat pointer. */
3465 got_fat_p = made_dummy = true;
3468 /* If the call above got something that has a pointer, that
3469 pointer is our type. This could have happened either
3470 because the type was elaborated or because somebody
3471 else executed the code below. */
3472 gnu_type = TYPE_POINTER_TO (gnu_old);
3475 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3476 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3477 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3478 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3481 TYPE_NAME (gnu_template_type)
3482 = create_concat_name (gnat_desig_equiv, "XUB");
3483 TYPE_DUMMY_P (gnu_template_type) = 1;
3485 TYPE_NAME (gnu_array_type)
3486 = create_concat_name (gnat_desig_equiv, "XUA");
3487 TYPE_DUMMY_P (gnu_array_type) = 1;
3489 gnu_type = make_node (RECORD_TYPE);
3490 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3491 TYPE_POINTER_TO (gnu_old) = gnu_type;
3493 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3495 = chainon (chainon (NULL_TREE,
3497 (get_identifier ("P_ARRAY"),
3499 gnu_type, 0, 0, 0, 0)),
3500 create_field_decl (get_identifier ("P_BOUNDS"),
3502 gnu_type, 0, 0, 0, 0));
3504 /* Make sure we can place this into a register. */
3505 TYPE_ALIGN (gnu_type)
3506 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3507 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3509 /* Do not finalize this record type since the types of
3510 its fields are incomplete. */
3511 finish_record_type (gnu_type, fields, 0, true);
3513 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3514 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3515 = create_concat_name (gnat_desig_equiv, "XUT");
3516 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3520 /* If we already know what the full type is, use it. */
3521 else if (Present (gnat_desig_full)
3522 && present_gnu_tree (gnat_desig_full))
3523 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3525 /* Get the type of the thing we are to point to and build a pointer
3526 to it. If it is a reference to an incomplete or private type with a
3527 full view that is a record, make a dummy type node and get the
3528 actual type later when we have verified it is safe. */
3529 else if ((! in_main_unit
3530 && ! present_gnu_tree (gnat_desig_equiv)
3531 && Present (gnat_desig_full)
3532 && ! present_gnu_tree (gnat_desig_full)
3533 && Is_Record_Type (gnat_desig_full))
3534 /* Likewise if we are pointing to a record or array and we
3535 are to defer elaborating incomplete types. We do this
3536 since this access type may be the full view of some
3537 private type. Note that the unconstrained array case is
3539 || ((! in_main_unit || imported_p)
3540 && defer_incomplete_level != 0
3541 && ! present_gnu_tree (gnat_desig_equiv)
3542 && ((Is_Record_Type (gnat_desig_rep)
3543 || Is_Array_Type (gnat_desig_rep))))
3544 /* If this is a reference from a limited_with type back to our
3545 main unit and there's a Freeze_Node for it, either we have
3546 already processed the declaration and made the dummy type,
3547 in which case we just reuse the latter, or we have not yet,
3548 in which case we make the dummy type and it will be reused
3549 when the declaration is processed. In both cases, the
3550 pointer eventually created below will be automatically
3551 adjusted when the Freeze_Node is processed. Note that the
3552 unconstrained array case is handled above. */
3553 || (in_main_unit && is_from_limited_with
3554 && Present (Freeze_Node (gnat_desig_rep))))
3556 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3560 /* Otherwise handle the case of a pointer to itself. */
3561 else if (gnat_desig_equiv == gnat_entity)
3564 = build_pointer_type_for_mode (void_type_node, p_mode,
3565 No_Strict_Aliasing (gnat_entity));
3566 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3569 /* If expansion is disabled, the equivalent type of a concurrent
3570 type is absent, so build a dummy pointer type. */
3571 else if (type_annotate_only && No (gnat_desig_equiv))
3572 gnu_type = ptr_void_type_node;
3574 /* Finally, handle the straightforward case where we can just
3575 elaborate our designated type and point to it. */
3577 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3579 /* It is possible that a call to gnat_to_gnu_type above resolved our
3580 type. If so, just return it. */
3581 if (present_gnu_tree (gnat_entity))
3583 maybe_present = true;
3587 /* If we have a GCC type for the designated type, possibly modify it
3588 if we are pointing only to constant objects and then make a pointer
3589 to it. Don't do this for unconstrained arrays. */
3590 if (!gnu_type && gnu_desig_type)
3592 if (Is_Access_Constant (gnat_entity)
3593 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3596 = build_qualified_type
3598 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3600 /* Some extra processing is required if we are building a
3601 pointer to an incomplete type (in the GCC sense). We might
3602 have such a type if we just made a dummy, or directly out
3603 of the call to gnat_to_gnu_type above if we are processing
3604 an access type for a record component designating the
3605 record type itself. */
3606 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3608 /* We must ensure that the pointer to variant we make will
3609 be processed by update_pointer_to when the initial type
3610 is completed. Pretend we made a dummy and let further
3611 processing act as usual. */
3614 /* We must ensure that update_pointer_to will not retrieve
3615 the dummy variant when building a properly qualified
3616 version of the complete type. We take advantage of the
3617 fact that get_qualified_type is requiring TYPE_NAMEs to
3618 match to influence build_qualified_type and then also
3619 update_pointer_to here. */
3620 TYPE_NAME (gnu_desig_type)
3621 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3626 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3627 No_Strict_Aliasing (gnat_entity));
3630 /* If we are not defining this object and we made a dummy pointer,
3631 save our current definition, evaluate the actual type, and replace
3632 the tentative type we made with the actual one. If we are to defer
3633 actually looking up the actual type, make an entry in the
3634 deferred list. If this is from a limited with, we have to defer
3635 to the end of the current spec in two cases: first if the
3636 designated type is in the current unit and second if the access
3638 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3641 = TYPE_FAT_POINTER_P (gnu_type)
3642 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3644 if (esize == POINTER_SIZE
3645 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3647 = build_pointer_type
3648 (TYPE_OBJECT_RECORD_TYPE
3649 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3651 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3652 !Comes_From_Source (gnat_entity),
3653 debug_info_p, gnat_entity);
3654 this_made_decl = true;
3655 gnu_type = TREE_TYPE (gnu_decl);
3656 save_gnu_tree (gnat_entity, gnu_decl, false);
3659 if (defer_incomplete_level == 0
3660 && ! (is_from_limited_with
3662 || In_Extended_Main_Code_Unit (gnat_entity))))
3663 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3664 gnat_to_gnu_type (gnat_desig_equiv));
3666 /* Note that the call to gnat_to_gnu_type here might have
3667 updated gnu_old_type directly, in which case it is not a
3668 dummy type any more when we get into update_pointer_to.
3670 This may happen for instance when the designated type is a
3671 record type, because their elaboration starts with an
3672 initial node from make_dummy_type, which may yield the same
3673 node as the one we got.
3675 Besides, variants of this non-dummy type might have been
3676 created along the way. update_pointer_to is expected to
3677 properly take care of those situations. */
3680 struct incomplete *p
3681 = (struct incomplete *) xmalloc (sizeof
3682 (struct incomplete));
3683 struct incomplete **head
3684 = (is_from_limited_with
3686 || In_Extended_Main_Code_Unit (gnat_entity))
3687 ? &defer_limited_with : &defer_incomplete_list);
3689 p->old_type = gnu_old_type;
3690 p->full_type = gnat_desig_equiv;
3698 case E_Access_Protected_Subprogram_Type:
3699 case E_Anonymous_Access_Protected_Subprogram_Type:
3700 if (type_annotate_only && No (gnat_equiv_type))
3701 gnu_type = ptr_void_type_node;
3704 /* The runtime representation is the equivalent type. */
3705 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3706 maybe_present = true;
3709 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3710 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3711 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3712 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3713 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3718 case E_Access_Subtype:
3720 /* We treat this as identical to its base type; any constraint is
3721 meaningful only to the front end.
3723 The designated type must be elaborated as well, if it does
3724 not have its own freeze node. Designated (sub)types created
3725 for constrained components of records with discriminants are
3726 not frozen by the front end and thus not elaborated by gigi,
3727 because their use may appear before the base type is frozen,
3728 and because it is not clear that they are needed anywhere in
3729 Gigi. With the current model, there is no correct place where
3730 they could be elaborated. */
3732 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3733 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3734 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3735 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3736 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3738 /* If we are not defining this entity, and we have incomplete
3739 entities being processed above us, make a dummy type and
3740 elaborate it later. */
3741 if (!definition && defer_incomplete_level != 0)
3743 struct incomplete *p
3744 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3746 = build_pointer_type
3747 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3749 p->old_type = TREE_TYPE (gnu_ptr_type);
3750 p->full_type = Directly_Designated_Type (gnat_entity);
3751 p->next = defer_incomplete_list;
3752 defer_incomplete_list = p;
3754 else if (!IN (Ekind (Base_Type
3755 (Directly_Designated_Type (gnat_entity))),
3756 Incomplete_Or_Private_Kind))
3757 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3761 maybe_present = true;
3764 /* Subprogram Entities
3766 The following access functions are defined for subprograms (functions
3769 First_Formal The first formal parameter.
3770 Is_Imported Indicates that the subprogram has appeared in
3771 an INTERFACE or IMPORT pragma. For now we
3772 assume that the external language is C.
3773 Is_Exported Likewise but for an EXPORT pragma.
3774 Is_Inlined True if the subprogram is to be inlined.
3776 In addition for function subprograms we have:
3778 Etype Return type of the function.
3780 Each parameter is first checked by calling must_pass_by_ref on its
3781 type to determine if it is passed by reference. For parameters which
3782 are copied in, if they are Ada In Out or Out parameters, their return
3783 value becomes part of a record which becomes the return type of the
3784 function (C function - note that this applies only to Ada procedures
3785 so there is no Ada return type). Additional code to store back the
3786 parameters will be generated on the caller side. This transformation
3787 is done here, not in the front-end.
3789 The intended result of the transformation can be seen from the
3790 equivalent source rewritings that follow:
3792 struct temp {int a,b};
3793 procedure P (A,B: In Out ...) is temp P (int A,B)
3796 end P; return {A,B};
3803 For subprogram types we need to perform mainly the same conversions to
3804 GCC form that are needed for procedures and function declarations. The
3805 only difference is that at the end, we make a type declaration instead
3806 of a function declaration. */
3808 case E_Subprogram_Type:
3812 /* The first GCC parameter declaration (a PARM_DECL node). The
3813 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3814 actually is the head of this parameter list. */
3815 tree gnu_param_list = NULL_TREE;
3816 /* Likewise for the stub associated with an exported procedure. */
3817 tree gnu_stub_param_list = NULL_TREE;
3818 /* The type returned by a function. If the subprogram is a procedure
3819 this type should be void_type_node. */
3820 tree gnu_return_type = void_type_node;
3821 /* List of fields in return type of procedure with copy-in copy-out
3823 tree gnu_field_list = NULL_TREE;
3824 /* Non-null for subprograms containing parameters passed by copy-in
3825 copy-out (Ada In Out or Out parameters not passed by reference),
3826 in which case it is the list of nodes used to specify the values of
3827 the in out/out parameters that are returned as a record upon
3828 procedure return. The TREE_PURPOSE of an element of this list is
3829 a field of the record and the TREE_VALUE is the PARM_DECL
3830 corresponding to that field. This list will be saved in the
3831 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3832 tree gnu_return_list = NULL_TREE;
3833 /* If an import pragma asks to map this subprogram to a GCC builtin,
3834 this is the builtin DECL node. */
3835 tree gnu_builtin_decl = NULL_TREE;
3836 /* For the stub associated with an exported procedure. */
3837 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3838 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3839 Entity_Id gnat_param;
3840 bool inline_flag = Is_Inlined (gnat_entity);
3841 bool public_flag = Is_Public (gnat_entity) || imported_p;
3843 = (Is_Public (gnat_entity) && !definition) || imported_p;
3845 /* The semantics of "pure" in Ada essentially matches that of "const"
3846 in the back-end. In particular, both properties are orthogonal to
3847 the "nothrow" property if the EH circuitry is explicit in the
3848 internal representation of the back-end. If we are to completely
3849 hide the EH circuitry from it, we need to declare that calls to pure
3850 Ada subprograms that can throw have side effects since they can
3851 trigger an "abnormal" transfer of control flow; thus they can be
3852 neither "const" nor "pure" in the back-end sense. */
3854 = (Exception_Mechanism == Back_End_Exceptions
3855 && Is_Pure (gnat_entity));
3857 bool volatile_flag = No_Return (gnat_entity);
3858 bool returns_by_ref = false;
3859 bool returns_unconstrained = false;
3860 bool returns_by_target_ptr = false;
3861 bool has_copy_in_out = false;
3862 bool has_stub = false;
3865 if (kind == E_Subprogram_Type && !definition)
3866 /* A parameter may refer to this type, so defer completion
3867 of any incomplete types. */
3868 defer_incomplete_level++, this_deferred = true;
3870 /* If the subprogram has an alias, it is probably inherited, so
3871 we can use the original one. If the original "subprogram"
3872 is actually an enumeration literal, it may be the first use
3873 of its type, so we must elaborate that type now. */
3874 if (Present (Alias (gnat_entity)))
3876 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3877 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3879 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3882 /* Elaborate any Itypes in the parameters of this entity. */
3883 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3884 Present (gnat_temp);
3885 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3886 if (Is_Itype (Etype (gnat_temp)))
3887 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3892 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3893 corresponding DECL node.
3895 We still want the parameter associations to take place because the
3896 proper generation of calls depends on it (a GNAT parameter without
3897 a corresponding GCC tree has a very specific meaning), so we don't
3899 if (Convention (gnat_entity) == Convention_Intrinsic)
3900 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3902 /* ??? What if we don't find the builtin node above ? warn ? err ?
3903 In the current state we neither warn nor err, and calls will just
3904 be handled as for regular subprograms. */
3906 if (kind == E_Function || kind == E_Subprogram_Type)
3907 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3909 /* If this function returns by reference, make the actual
3910 return type of this function the pointer and mark the decl. */
3911 if (Returns_By_Ref (gnat_entity))
3913 returns_by_ref = true;
3914 gnu_return_type = build_pointer_type (gnu_return_type);
3917 /* If the Mechanism is By_Reference, ensure the return type uses
3918 the machine's by-reference mechanism, which may not the same
3919 as above (e.g., it might be by passing a fake parameter). */
3920 else if (kind == E_Function
3921 && Mechanism (gnat_entity) == By_Reference)
3923 TREE_ADDRESSABLE (gnu_return_type) = 1;
3925 /* We expect this bit to be reset by gigi shortly, so can avoid a
3926 type node copy here. This actually also prevents troubles with
3927 the generation of debug information for the function, because
3928 we might have issued such info for this type already, and would
3929 be attaching a distinct type node to the function if we made a
3933 /* If we are supposed to return an unconstrained array,
3934 actually return a fat pointer and make a note of that. Return
3935 a pointer to an unconstrained record of variable size. */
3936 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3938 gnu_return_type = TREE_TYPE (gnu_return_type);
3939 returns_unconstrained = true;
3942 /* If the type requires a transient scope, the result is allocated
3943 on the secondary stack, so the result type of the function is
3945 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3947 gnu_return_type = build_pointer_type (gnu_return_type);
3948 returns_unconstrained = true;
3951 /* If the type is a padded type and the underlying type would not
3952 be passed by reference or this function has a foreign convention,
3953 return the underlying type. */
3954 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3955 && TYPE_IS_PADDING_P (gnu_return_type)
3956 && (!default_pass_by_ref (TREE_TYPE
3957 (TYPE_FIELDS (gnu_return_type)))
3958 || Has_Foreign_Convention (gnat_entity)))
3959 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3961 /* If the return type has a non-constant size, we convert the function
3962 into a procedure and its caller will pass a pointer to an object as
3963 the first parameter when we call the function. This can happen for
3964 an unconstrained type with a maximum size or a constrained type with
3965 a size not known at compile time. */
3966 if (TYPE_SIZE_UNIT (gnu_return_type)
3967 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
3969 returns_by_target_ptr = true;
3971 = create_param_decl (get_identifier ("TARGET"),
3972 build_reference_type (gnu_return_type),
3974 gnu_return_type = void_type_node;
3977 /* If the return type has a size that overflows, we cannot have
3978 a function that returns that type. This usage doesn't make
3979 sense anyway, so give an error here. */
3980 if (TYPE_SIZE_UNIT (gnu_return_type)
3981 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3982 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3984 post_error ("cannot return type whose size overflows",
3986 gnu_return_type = copy_node (gnu_return_type);
3987 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3988 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3989 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3990 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3993 /* Look at all our parameters and get the type of
3994 each. While doing this, build a copy-out structure if
3997 /* Loop over the parameters and get their associated GCC tree.
3998 While doing this, build a copy-out structure if we need one. */
3999 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
4000 Present (gnat_param);
4001 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
4003 tree gnu_param_name = get_entity_name (gnat_param);
4004 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4005 tree gnu_param, gnu_field;
4006 bool copy_in_copy_out = false;
4007 Mechanism_Type mech = Mechanism (gnat_param);
4009 /* Builtins are expanded inline and there is no real call sequence
4010 involved. So the type expected by the underlying expander is
4011 always the type of each argument "as is". */
4012 if (gnu_builtin_decl)
4014 /* Handle the first parameter of a valued procedure specially. */
4015 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
4016 mech = By_Copy_Return;
4017 /* Otherwise, see if a Mechanism was supplied that forced this
4018 parameter to be passed one way or another. */
4019 else if (mech == Default
4020 || mech == By_Copy || mech == By_Reference)
4022 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4023 mech = By_Descriptor;
4025 else if (By_Short_Descriptor_Last <= mech &&
4026 mech <= By_Short_Descriptor)
4027 mech = By_Short_Descriptor;
4031 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4032 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4033 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4035 mech = By_Reference;
4041 post_error ("unsupported mechanism for&", gnat_param);
4046 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4047 Has_Foreign_Convention (gnat_entity),
4050 /* We are returned either a PARM_DECL or a type if no parameter
4051 needs to be passed; in either case, adjust the type. */
4052 if (DECL_P (gnu_param))
4053 gnu_param_type = TREE_TYPE (gnu_param);
4056 gnu_param_type = gnu_param;
4057 gnu_param = NULL_TREE;
4062 /* If it's an exported subprogram, we build a parameter list
4063 in parallel, in case we need to emit a stub for it. */
4064 if (Is_Exported (gnat_entity))
4067 = chainon (gnu_param, gnu_stub_param_list);
4068 /* Change By_Descriptor parameter to By_Reference for
4069 the internal version of an exported subprogram. */
4070 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4073 = gnat_to_gnu_param (gnat_param, By_Reference,
4079 gnu_param = copy_node (gnu_param);
4082 gnu_param_list = chainon (gnu_param, gnu_param_list);
4083 Sloc_to_locus (Sloc (gnat_param),
4084 &DECL_SOURCE_LOCATION (gnu_param));
4085 save_gnu_tree (gnat_param, gnu_param, false);
4087 /* If a parameter is a pointer, this function may modify
4088 memory through it and thus shouldn't be considered
4089 a const function. Also, the memory may be modified
4090 between two calls, so they can't be CSE'ed. The latter
4091 case also handles by-ref parameters. */
4092 if (POINTER_TYPE_P (gnu_param_type)
4093 || TYPE_FAT_POINTER_P (gnu_param_type))
4097 if (copy_in_copy_out)
4099 if (!has_copy_in_out)
4101 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4102 gnu_return_type = make_node (RECORD_TYPE);
4103 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4104 has_copy_in_out = true;
4107 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4108 gnu_return_type, 0, 0, 0, 0);
4109 Sloc_to_locus (Sloc (gnat_param),
4110 &DECL_SOURCE_LOCATION (gnu_field));
4111 TREE_CHAIN (gnu_field) = gnu_field_list;
4112 gnu_field_list = gnu_field;
4113 gnu_return_list = tree_cons (gnu_field, gnu_param,
4118 /* Do not compute record for out parameters if subprogram is
4119 stubbed since structures are incomplete for the back-end. */
4120 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4121 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4124 /* If we have a CICO list but it has only one entry, we convert
4125 this function into a function that simply returns that one
4127 if (list_length (gnu_return_list) == 1)
4128 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
4130 if (Has_Stdcall_Convention (gnat_entity))
4131 prepend_one_attribute_to
4132 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4133 get_identifier ("stdcall"), NULL_TREE,
4136 /* If we are on a target where stack realignment is needed for 'main'
4137 to honor GCC's implicit expectations (stack alignment greater than
4138 what the base ABI guarantees), ensure we do the same for foreign
4139 convention subprograms as they might be used as callbacks from code
4140 breaking such expectations. Note that this applies to task entry
4141 points in particular. */
4142 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4143 && Has_Foreign_Convention (gnat_entity))
4144 prepend_one_attribute_to
4145 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4146 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4149 /* The lists have been built in reverse. */
4150 gnu_param_list = nreverse (gnu_param_list);
4152 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4153 gnu_return_list = nreverse (gnu_return_list);
4155 if (Ekind (gnat_entity) == E_Function)
4156 Set_Mechanism (gnat_entity,
4157 (returns_by_ref || returns_unconstrained
4158 ? By_Reference : By_Copy));
4160 = create_subprog_type (gnu_return_type, gnu_param_list,
4161 gnu_return_list, returns_unconstrained,
4162 returns_by_ref, returns_by_target_ptr);
4166 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4167 gnu_return_list, returns_unconstrained,
4168 returns_by_ref, returns_by_target_ptr);
4170 /* A subprogram (something that doesn't return anything) shouldn't
4171 be considered const since there would be no reason for such a
4172 subprogram. Note that procedures with Out (or In Out) parameters
4173 have already been converted into a function with a return type. */
4174 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4178 = build_qualified_type (gnu_type,
4179 TYPE_QUALS (gnu_type)
4180 | (TYPE_QUAL_CONST * const_flag)
4181 | (TYPE_QUAL_VOLATILE * volatile_flag));
4183 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4187 = build_qualified_type (gnu_stub_type,
4188 TYPE_QUALS (gnu_stub_type)
4189 | (TYPE_QUAL_CONST * const_flag)
4190 | (TYPE_QUAL_VOLATILE * volatile_flag));
4192 /* If we have a builtin decl for that function, check the signatures
4193 compatibilities. If the signatures are compatible, use the builtin
4194 decl. If they are not, we expect the checker predicate to have
4195 posted the appropriate errors, and just continue with what we have
4197 if (gnu_builtin_decl)
4199 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4201 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4203 gnu_decl = gnu_builtin_decl;
4204 gnu_type = gnu_builtin_type;
4209 /* If there was no specified Interface_Name and the external and
4210 internal names of the subprogram are the same, only use the
4211 internal name to allow disambiguation of nested subprograms. */
4212 if (No (Interface_Name (gnat_entity))
4213 && gnu_ext_name == gnu_entity_name)
4214 gnu_ext_name = NULL_TREE;
4216 /* If we are defining the subprogram and it has an Address clause
4217 we must get the address expression from the saved GCC tree for the
4218 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4219 the address expression here since the front-end has guaranteed
4220 in that case that the elaboration has no effects. If there is
4221 an Address clause and we are not defining the object, just
4222 make it a constant. */
4223 if (Present (Address_Clause (gnat_entity)))
4225 tree gnu_address = NULL_TREE;
4229 = (present_gnu_tree (gnat_entity)
4230 ? get_gnu_tree (gnat_entity)
4231 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4233 save_gnu_tree (gnat_entity, NULL_TREE, false);
4235 /* Convert the type of the object to a reference type that can
4236 alias everything as per 13.3(19). */
4238 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4240 gnu_address = convert (gnu_type, gnu_address);
4243 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4244 gnu_address, false, Is_Public (gnat_entity),
4245 extern_flag, false, NULL, gnat_entity);
4246 DECL_BY_REF_P (gnu_decl) = 1;
4249 else if (kind == E_Subprogram_Type)
4250 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4251 !Comes_From_Source (gnat_entity),
4252 debug_info_p, gnat_entity);
4257 gnu_stub_name = gnu_ext_name;
4258 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4259 public_flag = false;
4262 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4263 gnu_type, gnu_param_list,
4264 inline_flag, public_flag,
4265 extern_flag, attr_list,
4270 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4271 gnu_stub_type, gnu_stub_param_list,
4273 extern_flag, attr_list,
4275 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4278 /* This is unrelated to the stub built right above. */
4279 DECL_STUBBED_P (gnu_decl)
4280 = Convention (gnat_entity) == Convention_Stubbed;
4285 case E_Incomplete_Type:
4286 case E_Incomplete_Subtype:
4287 case E_Private_Type:
4288 case E_Private_Subtype:
4289 case E_Limited_Private_Type:
4290 case E_Limited_Private_Subtype:
4291 case E_Record_Type_With_Private:
4292 case E_Record_Subtype_With_Private:
4294 /* Get the "full view" of this entity. If this is an incomplete
4295 entity from a limited with, treat its non-limited view as the
4296 full view. Otherwise, use either the full view or the underlying
4297 full view, whichever is present. This is used in all the tests
4300 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4301 && From_With_Type (gnat_entity))
4302 ? Non_Limited_View (gnat_entity)
4303 : Present (Full_View (gnat_entity))
4304 ? Full_View (gnat_entity)
4305 : Underlying_Full_View (gnat_entity);
4307 /* If this is an incomplete type with no full view, it must be a Taft
4308 Amendment type, in which case we return a dummy type. Otherwise,
4309 just get the type from its Etype. */
4312 if (kind == E_Incomplete_Type)
4314 gnu_type = make_dummy_type (gnat_entity);
4315 gnu_decl = TYPE_STUB_DECL (gnu_type);
4319 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4321 maybe_present = true;
4326 /* If we already made a type for the full view, reuse it. */
4327 else if (present_gnu_tree (full_view))
4329 gnu_decl = get_gnu_tree (full_view);
4333 /* Otherwise, if we are not defining the type now, get the type
4334 from the full view. But always get the type from the full view
4335 for define on use types, since otherwise we won't see them! */
4336 else if (!definition
4337 || (Is_Itype (full_view)
4338 && No (Freeze_Node (gnat_entity)))
4339 || (Is_Itype (gnat_entity)
4340 && No (Freeze_Node (full_view))))
4342 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4343 maybe_present = true;
4347 /* For incomplete types, make a dummy type entry which will be
4348 replaced later. Save it as the full declaration's type so
4349 we can do any needed updates when we see it. */
4350 gnu_type = make_dummy_type (gnat_entity);
4351 gnu_decl = TYPE_STUB_DECL (gnu_type);
4352 save_gnu_tree (full_view, gnu_decl, 0);
4356 /* Simple class_wide types are always viewed as their root_type
4357 by Gigi unless an Equivalent_Type is specified. */
4358 case E_Class_Wide_Type:
4359 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4360 maybe_present = true;
4364 case E_Task_Subtype:
4365 case E_Protected_Type:
4366 case E_Protected_Subtype:
4367 if (type_annotate_only && No (gnat_equiv_type))
4368 gnu_type = void_type_node;
4370 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4372 maybe_present = true;
4376 gnu_decl = create_label_decl (gnu_entity_name);
4381 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4382 we've already saved it, so we don't try to. */
4383 gnu_decl = error_mark_node;
4391 /* If we had a case where we evaluated another type and it might have
4392 defined this one, handle it here. */
4393 if (maybe_present && present_gnu_tree (gnat_entity))
4395 gnu_decl = get_gnu_tree (gnat_entity);
4399 /* If we are processing a type and there is either no decl for it or
4400 we just made one, do some common processing for the type, such as
4401 handling alignment and possible padding. */
4402 if (is_type && (!gnu_decl || this_made_decl))
4404 if (Is_Tagged_Type (gnat_entity)
4405 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4406 TYPE_ALIGN_OK (gnu_type) = 1;
4408 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4409 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4411 /* ??? Don't set the size for a String_Literal since it is either
4412 confirming or we don't handle it properly (if the low bound is
4414 if (!gnu_size && kind != E_String_Literal_Subtype)
4415 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4417 Has_Size_Clause (gnat_entity));
4419 /* If a size was specified, see if we can make a new type of that size
4420 by rearranging the type, for example from a fat to a thin pointer. */
4424 = make_type_from_size (gnu_type, gnu_size,
4425 Has_Biased_Representation (gnat_entity));
4427 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4428 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4432 /* If the alignment hasn't already been processed and this is
4433 not an unconstrained array, see if an alignment is specified.
4434 If not, we pick a default alignment for atomic objects. */
4435 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4437 else if (Known_Alignment (gnat_entity))
4439 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4440 TYPE_ALIGN (gnu_type));
4442 /* Warn on suspiciously large alignments. This should catch
4443 errors about the (alignment,byte)/(size,bit) discrepancy. */
4444 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4448 /* If a size was specified, take it into account. Otherwise
4449 use the RM size for records as the type size has already
4450 been adjusted to the alignment. */
4453 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4454 || TREE_CODE (gnu_type) == UNION_TYPE
4455 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4456 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4457 size = rm_size (gnu_type);
4459 size = TYPE_SIZE (gnu_type);
4461 /* Consider an alignment as suspicious if the alignment/size
4462 ratio is greater or equal to the byte/bit ratio. */
4463 if (host_integerp (size, 1)
4464 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4465 post_error_ne ("?suspiciously large alignment specified for&",
4466 Expression (Alignment_Clause (gnat_entity)),
4470 else if (Is_Atomic (gnat_entity) && !gnu_size
4471 && host_integerp (TYPE_SIZE (gnu_type), 1)
4472 && integer_pow2p (TYPE_SIZE (gnu_type)))
4473 align = MIN (BIGGEST_ALIGNMENT,
4474 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4475 else if (Is_Atomic (gnat_entity) && gnu_size
4476 && host_integerp (gnu_size, 1)
4477 && integer_pow2p (gnu_size))
4478 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4480 /* See if we need to pad the type. If we did, and made a record,
4481 the name of the new type may be changed. So get it back for
4482 us when we make the new TYPE_DECL below. */
4483 if (gnu_size || align > 0)
4484 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4485 "PAD", true, definition, false);
4487 if (TREE_CODE (gnu_type) == RECORD_TYPE
4488 && TYPE_IS_PADDING_P (gnu_type))
4490 gnu_entity_name = TYPE_NAME (gnu_type);
4491 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4492 gnu_entity_name = DECL_NAME (gnu_entity_name);
4495 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4497 /* If we are at global level, GCC will have applied variable_size to
4498 the type, but that won't have done anything. So, if it's not
4499 a constant or self-referential, call elaborate_expression_1 to
4500 make a variable for the size rather than calculating it each time.
4501 Handle both the RM size and the actual size. */
4502 if (global_bindings_p ()
4503 && TYPE_SIZE (gnu_type)
4504 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4505 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4507 if (TREE_CODE (gnu_type) == RECORD_TYPE
4508 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4509 TYPE_SIZE (gnu_type), 0))
4511 TYPE_SIZE (gnu_type)
4512 = elaborate_expression_1 (gnat_entity, gnat_entity,
4513 TYPE_SIZE (gnu_type),
4514 get_identifier ("SIZE"),
4516 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4520 TYPE_SIZE (gnu_type)
4521 = elaborate_expression_1 (gnat_entity, gnat_entity,
4522 TYPE_SIZE (gnu_type),
4523 get_identifier ("SIZE"),
4526 /* ??? For now, store the size as a multiple of the alignment
4527 in bytes so that we can see the alignment from the tree. */
4528 TYPE_SIZE_UNIT (gnu_type)
4530 (MULT_EXPR, sizetype,
4531 elaborate_expression_1
4532 (gnat_entity, gnat_entity,
4533 build_binary_op (EXACT_DIV_EXPR, sizetype,
4534 TYPE_SIZE_UNIT (gnu_type),
4535 size_int (TYPE_ALIGN (gnu_type)
4537 get_identifier ("SIZE_A_UNIT"),
4539 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4541 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4544 elaborate_expression_1 (gnat_entity,
4546 TYPE_ADA_SIZE (gnu_type),
4547 get_identifier ("RM_SIZE"),
4552 /* If this is a record type or subtype, call elaborate_expression_1 on
4553 any field position. Do this for both global and local types.
4554 Skip any fields that we haven't made trees for to avoid problems with
4555 class wide types. */
4556 if (IN (kind, Record_Kind))
4557 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4558 gnat_temp = Next_Entity (gnat_temp))
4559 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4561 tree gnu_field = get_gnu_tree (gnat_temp);
4563 /* ??? Unfortunately, GCC needs to be able to prove the
4564 alignment of this offset and if it's a variable, it can't.
4565 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4566 right now, we have to put in an explicit multiply and
4567 divide by that value. */
4568 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4570 DECL_FIELD_OFFSET (gnu_field)
4572 (MULT_EXPR, sizetype,
4573 elaborate_expression_1
4574 (gnat_temp, gnat_temp,
4575 build_binary_op (EXACT_DIV_EXPR, sizetype,
4576 DECL_FIELD_OFFSET (gnu_field),
4577 size_int (DECL_OFFSET_ALIGN (gnu_field)
4579 get_identifier ("OFFSET"),
4581 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4583 /* ??? The context of gnu_field is not necessarily gnu_type so
4584 the MULT_EXPR node built above may not be marked by the call
4585 to create_type_decl below. */
4586 if (global_bindings_p ())
4587 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4591 gnu_type = build_qualified_type (gnu_type,
4592 (TYPE_QUALS (gnu_type)
4593 | (TYPE_QUAL_VOLATILE
4594 * Treat_As_Volatile (gnat_entity))));
4596 if (Is_Atomic (gnat_entity))
4597 check_ok_for_atomic (gnu_type, gnat_entity, false);
4599 if (Present (Alignment_Clause (gnat_entity)))
4600 TYPE_USER_ALIGN (gnu_type) = 1;
4602 if (Universal_Aliasing (gnat_entity))
4603 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4606 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4607 !Comes_From_Source (gnat_entity),
4608 debug_info_p, gnat_entity);
4610 TREE_TYPE (gnu_decl) = gnu_type;
4613 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4615 gnu_type = TREE_TYPE (gnu_decl);
4617 /* If this is a derived type, relate its alias set to that of its parent
4618 to avoid troubles when a call to an inherited primitive is inlined in
4619 a context where a derived object is accessed. The inlined code works
4620 on the parent view so the resulting code may access the same object
4621 using both the parent and the derived alias sets, which thus have to
4622 conflict. As the same issue arises with component references, the
4623 parent alias set also has to conflict with composite types enclosing
4624 derived components. For instance, if we have:
4631 we want T to conflict with both D and R, in addition to R being a
4632 superset of D by record/component construction.
4634 One way to achieve this is to perform an alias set copy from the
4635 parent to the derived type. This is not quite appropriate, though,
4636 as we don't want separate derived types to conflict with each other:
4638 type I1 is new Integer;
4639 type I2 is new Integer;
4641 We want I1 and I2 to both conflict with Integer but we do not want
4642 I1 to conflict with I2, and an alias set copy on derivation would
4645 The option chosen is to make the alias set of the derived type a
4646 superset of that of its parent type. It trivially fulfills the
4647 simple requirement for the Integer derivation example above, and
4648 the component case as well by superset transitivity:
4651 R ----------> D ----------> T
4653 The language rules ensure the parent type is already frozen here. */
4654 if (Is_Derived_Type (gnat_entity))
4656 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4657 relate_alias_sets (gnu_type, gnu_parent_type, ALIAS_SET_SUPERSET);
4660 /* Back-annotate the Alignment of the type if not already in the
4661 tree. Likewise for sizes. */
4662 if (Unknown_Alignment (gnat_entity))
4663 Set_Alignment (gnat_entity,
4664 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4666 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4668 /* If the size is self-referential, we annotate the maximum
4669 value of that size. */
4670 tree gnu_size = TYPE_SIZE (gnu_type);
4672 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4673 gnu_size = max_size (gnu_size, true);
4675 Set_Esize (gnat_entity, annotate_value (gnu_size));
4677 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4679 /* In this mode the tag and the parent components are not
4680 generated by the front-end, so the sizes must be adjusted
4682 int size_offset, new_size;
4684 if (Is_Derived_Type (gnat_entity))
4687 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4688 Set_Alignment (gnat_entity,
4689 Alignment (Etype (Base_Type (gnat_entity))));
4692 size_offset = POINTER_SIZE;
4694 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4695 Set_Esize (gnat_entity,
4696 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4697 / POINTER_SIZE) * POINTER_SIZE));
4698 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4702 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4703 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4706 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4707 DECL_ARTIFICIAL (gnu_decl) = 1;
4709 if (!debug_info_p && DECL_P (gnu_decl)
4710 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4711 && No (Renamed_Object (gnat_entity)))
4712 DECL_IGNORED_P (gnu_decl) = 1;
4714 /* If we haven't already, associate the ..._DECL node that we just made with
4715 the input GNAT entity node. */
4717 save_gnu_tree (gnat_entity, gnu_decl, false);
4719 /* If this is an enumeration or floating-point type, we were not able to set
4720 the bounds since they refer to the type. These are always static. */
4721 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4722 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4724 tree gnu_scalar_type = gnu_type;
4726 /* If this is a padded type, we need to use the underlying type. */
4727 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4728 && TYPE_IS_PADDING_P (gnu_scalar_type))
4729 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4731 /* If this is a floating point type and we haven't set a floating
4732 point type yet, use this in the evaluation of the bounds. */
4733 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4734 longest_float_type_node = gnu_scalar_type;
4736 TYPE_MIN_VALUE (gnu_scalar_type)
4737 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4738 TYPE_MAX_VALUE (gnu_scalar_type)
4739 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4741 /* For enumeration types, write full debugging information. */
4742 if (kind == E_Enumeration_Type)
4744 /* Since this has both a typedef and a tag, avoid outputting
4746 DECL_ARTIFICIAL (gnu_decl) = 1;
4747 rest_of_type_decl_compilation (gnu_decl);
4751 /* If we deferred processing of incomplete types, re-enable it. If there
4752 were no other disables and we have some to process, do so. */
4753 if (this_deferred && --defer_incomplete_level == 0)
4755 if (defer_incomplete_list)
4757 struct incomplete *incp, *next;
4759 /* We are back to level 0 for the deferring of incomplete types.
4760 But processing these incomplete types below may itself require
4761 deferring, so preserve what we have and restart from scratch. */
4762 incp = defer_incomplete_list;
4763 defer_incomplete_list = NULL;
4765 /* For finalization, however, all types must be complete so we
4766 cannot do the same because deferred incomplete types may end up
4767 referencing each other. Process them all recursively first. */
4768 defer_finalize_level++;
4770 for (; incp; incp = next)
4775 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4776 gnat_to_gnu_type (incp->full_type));
4780 defer_finalize_level--;
4783 /* All the deferred incomplete types have been processed so we can
4784 now proceed with the finalization of the deferred types. */
4785 if (defer_finalize_level == 0 && defer_finalize_list)
4790 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4791 rest_of_type_decl_compilation_no_defer (t);
4793 VEC_free (tree, heap, defer_finalize_list);
4797 /* If we are not defining this type, see if it's in the incomplete list.
4798 If so, handle that list entry now. */
4799 else if (!definition)
4801 struct incomplete *incp;
4803 for (incp = defer_incomplete_list; incp; incp = incp->next)
4804 if (incp->old_type && incp->full_type == gnat_entity)
4806 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4807 TREE_TYPE (gnu_decl));
4808 incp->old_type = NULL_TREE;
4815 /* If this is a packed array type whose original array type is itself
4816 an Itype without freeze node, make sure the latter is processed. */
4817 if (Is_Packed_Array_Type (gnat_entity)
4818 && Is_Itype (Original_Array_Type (gnat_entity))
4819 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4820 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4821 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4826 /* Similar, but if the returned value is a COMPONENT_REF, return the
4830 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4832 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4834 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4835 gnu_field = TREE_OPERAND (gnu_field, 1);
4840 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4841 the GCC type corresponding to that entity. */
4844 gnat_to_gnu_type (Entity_Id gnat_entity)
4848 /* The back end never attempts to annotate generic types. */
4849 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4850 return void_type_node;
4852 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4853 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4855 return TREE_TYPE (gnu_decl);
4858 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4859 the unpadded version of the GCC type corresponding to that entity. */
4862 get_unpadded_type (Entity_Id gnat_entity)
4864 tree type = gnat_to_gnu_type (gnat_entity);
4866 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4867 type = TREE_TYPE (TYPE_FIELDS (type));
4872 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4873 Every TYPE_DECL generated for a type definition must be passed
4874 to this function once everything else has been done for it. */
4877 rest_of_type_decl_compilation (tree decl)
4879 /* We need to defer finalizing the type if incomplete types
4880 are being deferred or if they are being processed. */
4881 if (defer_incomplete_level || defer_finalize_level)
4882 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4884 rest_of_type_decl_compilation_no_defer (decl);
4887 /* Same as above but without deferring the compilation. This
4888 function should not be invoked directly on a TYPE_DECL. */
4891 rest_of_type_decl_compilation_no_defer (tree decl)
4893 const int toplev = global_bindings_p ();
4894 tree t = TREE_TYPE (decl);
4896 rest_of_decl_compilation (decl, toplev, 0);
4898 /* Now process all the variants. This is needed for STABS. */
4899 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4901 if (t == TREE_TYPE (decl))
4904 if (!TYPE_STUB_DECL (t))
4905 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4907 rest_of_type_compilation (t, toplev);
4911 /* Finalize any From_With_Type incomplete types. We do this after processing
4912 our compilation unit and after processing its spec, if this is a body. */
4915 finalize_from_with_types (void)
4917 struct incomplete *incp = defer_limited_with;
4918 struct incomplete *next;
4920 defer_limited_with = 0;
4921 for (; incp; incp = next)
4925 if (incp->old_type != 0)
4926 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4927 gnat_to_gnu_type (incp->full_type));
4932 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4933 kind of type (such E_Task_Type) that has a different type which Gigi
4934 uses for its representation. If the type does not have a special type
4935 for its representation, return GNAT_ENTITY. If a type is supposed to
4936 exist, but does not, abort unless annotating types, in which case
4937 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4940 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4942 Entity_Id gnat_equiv = gnat_entity;
4944 if (No (gnat_entity))
4947 switch (Ekind (gnat_entity))
4949 case E_Class_Wide_Subtype:
4950 if (Present (Equivalent_Type (gnat_entity)))
4951 gnat_equiv = Equivalent_Type (gnat_entity);
4954 case E_Access_Protected_Subprogram_Type:
4955 case E_Anonymous_Access_Protected_Subprogram_Type:
4956 gnat_equiv = Equivalent_Type (gnat_entity);
4959 case E_Class_Wide_Type:
4960 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
4961 ? Equivalent_Type (gnat_entity)
4962 : Root_Type (gnat_entity));
4966 case E_Task_Subtype:
4967 case E_Protected_Type:
4968 case E_Protected_Subtype:
4969 gnat_equiv = Corresponding_Record_Type (gnat_entity);
4976 gcc_assert (Present (gnat_equiv) || type_annotate_only);
4980 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
4981 using MECH as its passing mechanism, to be placed in the parameter
4982 list built for GNAT_SUBPROG. Assume a foreign convention for the
4983 latter if FOREIGN is true. Also set CICO to true if the parameter
4984 must use the copy-in copy-out implementation mechanism.
4986 The returned tree is a PARM_DECL, except for those cases where no
4987 parameter needs to be actually passed to the subprogram; the type
4988 of this "shadow" parameter is then returned instead. */
4991 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
4992 Entity_Id gnat_subprog, bool foreign, bool *cico)
4994 tree gnu_param_name = get_entity_name (gnat_param);
4995 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4996 tree gnu_param_type_alt = NULL_TREE;
4997 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
4998 /* The parameter can be indirectly modified if its address is taken. */
4999 bool ro_param = in_param && !Address_Taken (gnat_param);
5000 bool by_return = false, by_component_ptr = false, by_ref = false;
5003 /* Copy-return is used only for the first parameter of a valued procedure.
5004 It's a copy mechanism for which a parameter is never allocated. */
5005 if (mech == By_Copy_Return)
5007 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5012 /* If this is either a foreign function or if the underlying type won't
5013 be passed by reference, strip off possible padding type. */
5014 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
5015 && TYPE_IS_PADDING_P (gnu_param_type))
5017 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5019 if (mech == By_Reference
5021 || (!must_pass_by_ref (unpadded_type)
5022 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5023 gnu_param_type = unpadded_type;
5026 /* If this is a read-only parameter, make a variant of the type that is
5027 read-only. ??? However, if this is an unconstrained array, that type
5028 can be very complex, so skip it for now. Likewise for any other
5029 self-referential type. */
5031 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5032 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5033 gnu_param_type = build_qualified_type (gnu_param_type,
5034 (TYPE_QUALS (gnu_param_type)
5035 | TYPE_QUAL_CONST));
5037 /* For foreign conventions, pass arrays as pointers to the element type.
5038 First check for unconstrained array and get the underlying array. */
5039 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5041 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5043 /* VMS descriptors are themselves passed by reference. */
5044 if (mech == By_Short_Descriptor ||
5045 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5047 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5048 Mechanism (gnat_param),
5050 else if (mech == By_Descriptor)
5052 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5053 chosen in fill_vms_descriptor. */
5055 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5056 Mechanism (gnat_param),
5059 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5060 Mechanism (gnat_param),
5064 /* Arrays are passed as pointers to element type for foreign conventions. */
5067 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5069 /* Strip off any multi-dimensional entries, then strip
5070 off the last array to get the component type. */
5071 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5072 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5073 gnu_param_type = TREE_TYPE (gnu_param_type);
5075 by_component_ptr = true;
5076 gnu_param_type = TREE_TYPE (gnu_param_type);
5079 gnu_param_type = build_qualified_type (gnu_param_type,
5080 (TYPE_QUALS (gnu_param_type)
5081 | TYPE_QUAL_CONST));
5083 gnu_param_type = build_pointer_type (gnu_param_type);
5086 /* Fat pointers are passed as thin pointers for foreign conventions. */
5087 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
5089 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5091 /* If we must pass or were requested to pass by reference, do so.
5092 If we were requested to pass by copy, do so.
5093 Otherwise, for foreign conventions, pass In Out or Out parameters
5094 or aggregates by reference. For COBOL and Fortran, pass all
5095 integer and FP types that way too. For Convention Ada, use
5096 the standard Ada default. */
5097 else if (must_pass_by_ref (gnu_param_type)
5098 || mech == By_Reference
5101 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5103 && (Convention (gnat_subprog) == Convention_Fortran
5104 || Convention (gnat_subprog) == Convention_COBOL)
5105 && (INTEGRAL_TYPE_P (gnu_param_type)
5106 || FLOAT_TYPE_P (gnu_param_type)))
5108 && default_pass_by_ref (gnu_param_type)))))
5110 gnu_param_type = build_reference_type (gnu_param_type);
5114 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5118 if (mech == By_Copy && (by_ref || by_component_ptr))
5119 post_error ("?cannot pass & by copy", gnat_param);
5121 /* If this is an Out parameter that isn't passed by reference and isn't
5122 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5123 it will be a VAR_DECL created when we process the procedure, so just
5124 return its type. For the special parameter of a valued procedure,
5127 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5128 Out parameters with discriminants or implicit initial values to be
5129 handled like In Out parameters. These type are normally built as
5130 aggregates, hence passed by reference, except for some packed arrays
5131 which end up encoded in special integer types.
5133 The exception we need to make is then for packed arrays of records
5134 with discriminants or implicit initial values. We have no light/easy
5135 way to check for the latter case, so we merely check for packed arrays
5136 of records. This may lead to useless copy-in operations, but in very
5137 rare cases only, as these would be exceptions in a set of already
5138 exceptional situations. */
5139 if (Ekind (gnat_param) == E_Out_Parameter
5142 || (mech != By_Descriptor
5143 && mech != By_Short_Descriptor
5144 && !POINTER_TYPE_P (gnu_param_type)
5145 && !AGGREGATE_TYPE_P (gnu_param_type)))
5146 && !(Is_Array_Type (Etype (gnat_param))
5147 && Is_Packed (Etype (gnat_param))
5148 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5149 return gnu_param_type;
5151 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5152 ro_param || by_ref || by_component_ptr);
5153 DECL_BY_REF_P (gnu_param) = by_ref;
5154 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5155 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5156 mech == By_Short_Descriptor);
5157 DECL_POINTS_TO_READONLY_P (gnu_param)
5158 = (ro_param && (by_ref || by_component_ptr));
5160 /* Save the alternate descriptor type, if any. */
5161 if (gnu_param_type_alt)
5162 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5164 /* If no Mechanism was specified, indicate what we're using, then
5165 back-annotate it. */
5166 if (mech == Default)
5167 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5169 Set_Mechanism (gnat_param, mech);
5173 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5176 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5178 while (Present (Corresponding_Discriminant (discr1)))
5179 discr1 = Corresponding_Discriminant (discr1);
5181 while (Present (Corresponding_Discriminant (discr2)))
5182 discr2 = Corresponding_Discriminant (discr2);
5185 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5188 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
5189 a non-aliased component in the back-end sense. */
5192 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
5194 /* If the type below this is a multi-array type, then
5195 this does not have aliased components. */
5196 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5197 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5200 if (Has_Aliased_Components (gnat_type))
5203 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5206 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5209 compile_time_known_address_p (Node_Id gnat_address)
5211 /* Catch System'To_Address. */
5212 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5213 gnat_address = Expression (gnat_address);
5215 return Compile_Time_Known_Value (gnat_address);
5218 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5219 be elaborated at the point of its definition, but do nothing else. */
5222 elaborate_entity (Entity_Id gnat_entity)
5224 switch (Ekind (gnat_entity))
5226 case E_Signed_Integer_Subtype:
5227 case E_Modular_Integer_Subtype:
5228 case E_Enumeration_Subtype:
5229 case E_Ordinary_Fixed_Point_Subtype:
5230 case E_Decimal_Fixed_Point_Subtype:
5231 case E_Floating_Point_Subtype:
5233 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5234 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5236 /* ??? Tests to avoid Constraint_Error in static expressions
5237 are needed until after the front stops generating bogus
5238 conversions on bounds of real types. */
5239 if (!Raises_Constraint_Error (gnat_lb))
5240 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5241 1, 0, Needs_Debug_Info (gnat_entity));
5242 if (!Raises_Constraint_Error (gnat_hb))
5243 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5244 1, 0, Needs_Debug_Info (gnat_entity));
5250 Node_Id full_definition = Declaration_Node (gnat_entity);
5251 Node_Id record_definition = Type_Definition (full_definition);
5253 /* If this is a record extension, go a level further to find the
5254 record definition. */
5255 if (Nkind (record_definition) == N_Derived_Type_Definition)
5256 record_definition = Record_Extension_Part (record_definition);
5260 case E_Record_Subtype:
5261 case E_Private_Subtype:
5262 case E_Limited_Private_Subtype:
5263 case E_Record_Subtype_With_Private:
5264 if (Is_Constrained (gnat_entity)
5265 && Has_Discriminants (Base_Type (gnat_entity))
5266 && Present (Discriminant_Constraint (gnat_entity)))
5268 Node_Id gnat_discriminant_expr;
5269 Entity_Id gnat_field;
5271 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
5272 gnat_discriminant_expr
5273 = First_Elmt (Discriminant_Constraint (gnat_entity));
5274 Present (gnat_field);
5275 gnat_field = Next_Discriminant (gnat_field),
5276 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5277 /* ??? For now, ignore access discriminants. */
5278 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5279 elaborate_expression (Node (gnat_discriminant_expr),
5281 get_entity_name (gnat_field), 1, 0, 0);
5288 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5289 any entities on its entity chain similarly. */
5292 mark_out_of_scope (Entity_Id gnat_entity)
5294 Entity_Id gnat_sub_entity;
5295 unsigned int kind = Ekind (gnat_entity);
5297 /* If this has an entity list, process all in the list. */
5298 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5299 || IN (kind, Private_Kind)
5300 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5301 || kind == E_Function || kind == E_Generic_Function
5302 || kind == E_Generic_Package || kind == E_Generic_Procedure
5303 || kind == E_Loop || kind == E_Operator || kind == E_Package
5304 || kind == E_Package_Body || kind == E_Procedure
5305 || kind == E_Record_Type || kind == E_Record_Subtype
5306 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5307 for (gnat_sub_entity = First_Entity (gnat_entity);
5308 Present (gnat_sub_entity);
5309 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5310 if (Scope (gnat_sub_entity) == gnat_entity
5311 && gnat_sub_entity != gnat_entity)
5312 mark_out_of_scope (gnat_sub_entity);
5314 /* Now clear this if it has been defined, but only do so if it isn't
5315 a subprogram or parameter. We could refine this, but it isn't
5316 worth it. If this is statically allocated, it is supposed to
5317 hang around out of cope. */
5318 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5319 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5321 save_gnu_tree (gnat_entity, NULL_TREE, true);
5322 save_gnu_tree (gnat_entity, error_mark_node, true);
5326 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5327 If this is a multi-dimensional array type, do this recursively.
5330 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5331 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5332 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5335 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5337 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5338 of a one-dimensional array, since the padding has the same alias set
5339 as the field type, but if it's a multi-dimensional array, we need to
5340 see the inner types. */
5341 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5342 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5343 || TYPE_IS_PADDING_P (gnu_old_type)))
5344 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5346 /* Unconstrained array types are deemed incomplete and would thus be given
5347 alias set 0. Retrieve the underlying array type. */
5348 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5350 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5351 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5353 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5355 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5356 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5357 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5358 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5362 case ALIAS_SET_COPY:
5363 /* The alias set shouldn't be copied between array types with different
5364 aliasing settings because this can break the aliasing relationship
5365 between the array type and its element type. */
5366 #ifndef ENABLE_CHECKING
5367 if (flag_strict_aliasing)
5369 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5370 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5371 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5372 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5374 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5377 case ALIAS_SET_SUBSET:
5378 case ALIAS_SET_SUPERSET:
5380 alias_set_type old_set = get_alias_set (gnu_old_type);
5381 alias_set_type new_set = get_alias_set (gnu_new_type);
5383 /* Do nothing if the alias sets conflict. This ensures that we
5384 never call record_alias_subset several times for the same pair
5385 or at all for alias set 0. */
5386 if (!alias_sets_conflict_p (old_set, new_set))
5388 if (op == ALIAS_SET_SUBSET)
5389 record_alias_subset (old_set, new_set);
5391 record_alias_subset (new_set, old_set);
5400 record_component_aliases (gnu_new_type);
5403 /* Return a TREE_LIST describing the substitutions needed to reflect
5404 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
5405 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
5406 of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE
5407 gives the tree for the discriminant and TREE_VALUES is the replacement
5408 value. They are in the form of operands to substitute_in_expr.
5409 DEFINITION is as in gnat_to_gnu_entity. */
5412 substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type,
5413 tree gnu_list, bool definition)
5415 Entity_Id gnat_discrim;
5419 gnat_type = Implementation_Base_Type (gnat_subtype);
5421 if (Has_Discriminants (gnat_type))
5422 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5423 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5424 Present (gnat_discrim);
5425 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5426 gnat_value = Next_Elmt (gnat_value))
5427 /* Ignore access discriminants. */
5428 if (!Is_Access_Type (Etype (Node (gnat_value))))
5429 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5430 elaborate_expression
5431 (Node (gnat_value), gnat_subtype,
5432 get_entity_name (gnat_discrim), definition,
5439 /* Return true if the size represented by GNU_SIZE can be handled by an
5440 allocation. If STATIC_P is true, consider only what can be done with a
5441 static allocation. */
5444 allocatable_size_p (tree gnu_size, bool static_p)
5446 HOST_WIDE_INT our_size;
5448 /* If this is not a static allocation, the only case we want to forbid
5449 is an overflowing size. That will be converted into a raise a
5452 return !(TREE_CODE (gnu_size) == INTEGER_CST
5453 && TREE_OVERFLOW (gnu_size));
5455 /* Otherwise, we need to deal with both variable sizes and constant
5456 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5457 since assemblers may not like very large sizes. */
5458 if (!host_integerp (gnu_size, 1))
5461 our_size = tree_low_cst (gnu_size, 1);
5462 return (int) our_size == our_size;
5465 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5466 NAME, ARGS and ERROR_POINT. */
5469 prepend_one_attribute_to (struct attrib ** attr_list,
5470 enum attr_type attr_type,
5473 Node_Id attr_error_point)
5475 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5477 attr->type = attr_type;
5478 attr->name = attr_name;
5479 attr->args = attr_args;
5480 attr->error_point = attr_error_point;
5482 attr->next = *attr_list;
5486 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5489 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5493 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5494 gnat_temp = Next_Rep_Item (gnat_temp))
5495 if (Nkind (gnat_temp) == N_Pragma)
5497 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5498 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5499 enum attr_type etype;
5501 if (Present (gnat_assoc) && Present (First (gnat_assoc))
5502 && Present (Next (First (gnat_assoc)))
5503 && (Nkind (Expression (Next (First (gnat_assoc))))
5504 == N_String_Literal))
5506 gnu_arg0 = get_identifier (TREE_STRING_POINTER
5509 (First (gnat_assoc))))));
5510 if (Present (Next (Next (First (gnat_assoc))))
5511 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
5512 == N_String_Literal))
5513 gnu_arg1 = get_identifier (TREE_STRING_POINTER
5517 (First (gnat_assoc)))))));
5520 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5522 case Pragma_Machine_Attribute:
5523 etype = ATTR_MACHINE_ATTRIBUTE;
5526 case Pragma_Linker_Alias:
5527 etype = ATTR_LINK_ALIAS;
5530 case Pragma_Linker_Section:
5531 etype = ATTR_LINK_SECTION;
5534 case Pragma_Linker_Constructor:
5535 etype = ATTR_LINK_CONSTRUCTOR;
5538 case Pragma_Linker_Destructor:
5539 etype = ATTR_LINK_DESTRUCTOR;
5542 case Pragma_Weak_External:
5543 etype = ATTR_WEAK_EXTERNAL;
5546 case Pragma_Thread_Local_Storage:
5547 etype = ATTR_THREAD_LOCAL_STORAGE;
5555 /* Prepend to the list now. Make a list of the argument we might
5556 have, as GCC expects it. */
5557 prepend_one_attribute_to
5560 (gnu_arg1 != NULL_TREE)
5561 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5562 Present (Next (First (gnat_assoc)))
5563 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5567 /* Called when we need to protect a variable object using a save_expr. */
5570 maybe_variable (tree gnu_operand)
5572 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
5573 || TREE_CODE (gnu_operand) == SAVE_EXPR
5574 || TREE_CODE (gnu_operand) == NULL_EXPR)
5577 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5579 tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF,
5580 TREE_TYPE (gnu_operand),
5581 variable_size (TREE_OPERAND (gnu_operand, 0)));
5583 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5584 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5588 return variable_size (gnu_operand);
5591 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5592 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5593 return the GCC tree to use for that expression. GNU_NAME is the
5594 qualification to use if an external name is appropriate and DEFINITION is
5595 true if this is a definition of GNAT_ENTITY. If NEED_VALUE is true, we
5596 need a result. Otherwise, we are just elaborating this for side-effects.
5597 If NEED_DEBUG is true we need the symbol for debugging purposes even if it
5598 isn't needed for code generation. */
5601 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity,
5602 tree gnu_name, bool definition, bool need_value,
5607 /* If we already elaborated this expression (e.g., it was involved
5608 in the definition of a private type), use the old value. */
5609 if (present_gnu_tree (gnat_expr))
5610 return get_gnu_tree (gnat_expr);
5612 /* If we don't need a value and this is static or a discriminant, we
5613 don't need to do anything. */
5614 else if (!need_value
5615 && (Is_OK_Static_Expression (gnat_expr)
5616 || (Nkind (gnat_expr) == N_Identifier
5617 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5620 /* Otherwise, convert this tree to its GCC equivalent. */
5622 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
5623 gnu_name, definition, need_debug);
5625 /* Save the expression in case we try to elaborate this entity again. Since
5626 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5627 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5628 save_gnu_tree (gnat_expr, gnu_expr, true);
5630 return need_value ? gnu_expr : error_mark_node;
5633 /* Similar, but take a GNU expression. */
5636 elaborate_expression_1 (Node_Id gnat_expr, Entity_Id gnat_entity,
5637 tree gnu_expr, tree gnu_name, bool definition,
5640 tree gnu_decl = NULL_TREE;
5641 /* Skip any conversions and simple arithmetics to see if the expression
5642 is a read-only variable.
5643 ??? This really should remain read-only, but we have to think about
5644 the typing of the tree here. */
5646 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5647 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5650 /* In most cases, we won't see a naked FIELD_DECL here because a
5651 discriminant reference will have been replaced with a COMPONENT_REF
5652 when the type is being elaborated. However, there are some cases
5653 involving child types where we will. So convert it to a COMPONENT_REF
5654 here. We have to hope it will be at the highest level of the
5655 expression in these cases. */
5656 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5657 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5658 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5659 gnu_expr, NULL_TREE);
5661 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5662 that is read-only, make a variable that is initialized to contain the
5663 bound when the package containing the definition is elaborated. If
5664 this entity is defined at top level and a bound or discriminant value
5665 isn't a constant or a reference to a discriminant, replace the bound
5666 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5667 rely here on the fact that an expression cannot contain both the
5668 discriminant and some other variable. */
5670 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5671 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5672 && (TREE_READONLY (gnu_inner_expr)
5673 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5674 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5676 /* If this is a static expression or contains a discriminant, we don't
5677 need the variable for debugging (and can't elaborate anyway if a
5680 && (Is_OK_Static_Expression (gnat_expr)
5681 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
5684 /* Now create the variable if we need it. */
5685 if (need_debug || (expr_variable && expr_global))
5687 = create_var_decl (create_concat_name (gnat_entity,
5688 IDENTIFIER_POINTER (gnu_name)),
5689 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5690 !need_debug, Is_Public (gnat_entity),
5691 !definition, false, NULL, gnat_entity);
5693 /* We only need to use this variable if we are in global context since GCC
5694 can do the right thing in the local case. */
5695 if (expr_global && expr_variable)
5697 else if (!expr_variable)
5700 return maybe_variable (gnu_expr);
5703 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5704 starting bit position so that it is aligned to ALIGN bits, and leaving at
5705 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5706 record is guaranteed to get. */
5709 make_aligning_type (tree type, unsigned int align, tree size,
5710 unsigned int base_align, int room)
5712 /* We will be crafting a record type with one field at a position set to be
5713 the next multiple of ALIGN past record'address + room bytes. We use a
5714 record placeholder to express record'address. */
5716 tree record_type = make_node (RECORD_TYPE);
5717 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5720 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5722 /* The diagram below summarizes the shape of what we manipulate:
5724 <--------- pos ---------->
5725 { +------------+-------------+-----------------+
5726 record =>{ |############| ... | field (type) |
5727 { +------------+-------------+-----------------+
5728 |<-- room -->|<- voffset ->|<---- size ----->|
5731 record_addr vblock_addr
5733 Every length is in sizetype bytes there, except "pos" which has to be
5734 set as a bit position in the GCC tree for the record. */
5736 tree room_st = size_int (room);
5737 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5738 tree voffset_st, pos, field;
5740 tree name = TYPE_NAME (type);
5742 if (TREE_CODE (name) == TYPE_DECL)
5743 name = DECL_NAME (name);
5745 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5747 /* Compute VOFFSET and then POS. The next byte position multiple of some
5748 alignment after some address is obtained by "and"ing the alignment minus
5749 1 with the two's complement of the address. */
5751 voffset_st = size_binop (BIT_AND_EXPR,
5752 size_diffop (size_zero_node, vblock_addr_st),
5753 ssize_int ((align / BITS_PER_UNIT) - 1));
5755 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5757 pos = size_binop (MULT_EXPR,
5758 convert (bitsizetype,
5759 size_binop (PLUS_EXPR, room_st, voffset_st)),
5762 /* Craft the GCC record representation. We exceptionally do everything
5763 manually here because 1) our generic circuitry is not quite ready to
5764 handle the complex position/size expressions we are setting up, 2) we
5765 have a strong simplifying factor at hand: we know the maximum possible
5766 value of voffset, and 3) we have to set/reset at least the sizes in
5767 accordance with this maximum value anyway, as we need them to convey
5768 what should be "alloc"ated for this type.
5770 Use -1 as the 'addressable' indication for the field to prevent the
5771 creation of a bitfield. We don't need one, it would have damaging
5772 consequences on the alignment computation, and create_field_decl would
5773 make one without this special argument, for instance because of the
5774 complex position expression. */
5776 field = create_field_decl (get_identifier ("F"), type, record_type,
5778 TYPE_FIELDS (record_type) = field;
5780 TYPE_ALIGN (record_type) = base_align;
5781 TYPE_USER_ALIGN (record_type) = 1;
5783 TYPE_SIZE (record_type)
5784 = size_binop (PLUS_EXPR,
5785 size_binop (MULT_EXPR, convert (bitsizetype, size),
5787 bitsize_int (align + room * BITS_PER_UNIT));
5788 TYPE_SIZE_UNIT (record_type)
5789 = size_binop (PLUS_EXPR, size,
5790 size_int (room + align / BITS_PER_UNIT));
5792 SET_TYPE_MODE (record_type, BLKmode);
5794 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5798 /* Return the result of rounding T up to ALIGN. */
5800 static inline unsigned HOST_WIDE_INT
5801 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5809 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5810 as the field type of a packed record if IN_RECORD is true, or as the
5811 component type of a packed array if IN_RECORD is false. See if we can
5812 rewrite it either as a type that has a non-BLKmode, which we can pack
5813 tighter in the packed record case, or as a smaller type. If so, return
5814 the new type. If not, return the original type. */
5817 make_packable_type (tree type, bool in_record)
5819 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5820 unsigned HOST_WIDE_INT new_size;
5821 tree new_type, old_field, field_list = NULL_TREE;
5823 /* No point in doing anything if the size is zero. */
5827 new_type = make_node (TREE_CODE (type));
5829 /* Copy the name and flags from the old type to that of the new.
5830 Note that we rely on the pointer equality created here for
5831 TYPE_NAME to look through conversions in various places. */
5832 TYPE_NAME (new_type) = TYPE_NAME (type);
5833 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5834 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5835 if (TREE_CODE (type) == RECORD_TYPE)
5836 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5838 /* If we are in a record and have a small size, set the alignment to
5839 try for an integral mode. Otherwise set it to try for a smaller
5840 type with BLKmode. */
5841 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5843 TYPE_ALIGN (new_type) = ceil_alignment (size);
5844 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5848 unsigned HOST_WIDE_INT align;
5850 /* Do not try to shrink the size if the RM size is not constant. */
5851 if (TYPE_CONTAINS_TEMPLATE_P (type)
5852 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5855 /* Round the RM size up to a unit boundary to get the minimal size
5856 for a BLKmode record. Give up if it's already the size. */
5857 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5858 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5859 if (new_size == size)
5862 align = new_size & -new_size;
5863 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5866 TYPE_USER_ALIGN (new_type) = 1;
5868 /* Now copy the fields, keeping the position and size as we don't want
5869 to change the layout by propagating the packedness downwards. */
5870 for (old_field = TYPE_FIELDS (type); old_field;
5871 old_field = TREE_CHAIN (old_field))
5873 tree new_field_type = TREE_TYPE (old_field);
5874 tree new_field, new_size;
5876 if ((TREE_CODE (new_field_type) == RECORD_TYPE
5877 || TREE_CODE (new_field_type) == UNION_TYPE
5878 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5879 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5880 && host_integerp (TYPE_SIZE (new_field_type), 1))
5881 new_field_type = make_packable_type (new_field_type, true);
5883 /* However, for the last field in a not already packed record type
5884 that is of an aggregate type, we need to use the RM size in the
5885 packable version of the record type, see finish_record_type. */
5886 if (!TREE_CHAIN (old_field)
5887 && !TYPE_PACKED (type)
5888 && (TREE_CODE (new_field_type) == RECORD_TYPE
5889 || TREE_CODE (new_field_type) == UNION_TYPE
5890 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5891 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5892 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5893 && TYPE_ADA_SIZE (new_field_type))
5894 new_size = TYPE_ADA_SIZE (new_field_type);
5896 new_size = DECL_SIZE (old_field);
5898 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5899 new_type, TYPE_PACKED (type), new_size,
5900 bit_position (old_field),
5901 !DECL_NONADDRESSABLE_P (old_field));
5903 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
5904 SET_DECL_ORIGINAL_FIELD
5905 (new_field, (DECL_ORIGINAL_FIELD (old_field)
5906 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
5908 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
5909 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
5911 TREE_CHAIN (new_field) = field_list;
5912 field_list = new_field;
5915 finish_record_type (new_type, nreverse (field_list), 2, true);
5916 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
5918 /* If this is a padding record, we never want to make the size smaller
5919 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
5920 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5921 || TREE_CODE (type) == QUAL_UNION_TYPE)
5923 TYPE_SIZE (new_type) = TYPE_SIZE (type);
5924 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
5928 TYPE_SIZE (new_type) = bitsize_int (new_size);
5929 TYPE_SIZE_UNIT (new_type)
5930 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
5933 if (!TYPE_CONTAINS_TEMPLATE_P (type))
5934 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
5936 compute_record_mode (new_type);
5938 /* Try harder to get a packable type if necessary, for example
5939 in case the record itself contains a BLKmode field. */
5940 if (in_record && TYPE_MODE (new_type) == BLKmode)
5941 SET_TYPE_MODE (new_type,
5942 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
5944 /* If neither the mode nor the size has shrunk, return the old type. */
5945 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
5951 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
5952 if needed. We have already verified that SIZE and TYPE are large enough.
5954 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
5957 IS_USER_TYPE is true if we must complete the original type.
5959 DEFINITION is true if this type is being defined.
5961 SAME_RM_SIZE is true if the RM size of the resulting type is to be set
5962 to SIZE too; otherwise, it's set to the RM size of the original type. */
5965 maybe_pad_type (tree type, tree size, unsigned int align,
5966 Entity_Id gnat_entity, const char *name_trailer,
5967 bool is_user_type, bool definition, bool same_rm_size)
5969 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
5970 tree orig_size = TYPE_SIZE (type);
5971 unsigned int orig_align = align;
5974 /* If TYPE is a padded type, see if it agrees with any size and alignment
5975 we were given. If so, return the original type. Otherwise, strip
5976 off the padding, since we will either be returning the inner type
5977 or repadding it. If no size or alignment is specified, use that of
5978 the original padded type. */
5979 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5982 || operand_equal_p (round_up (size,
5983 MAX (align, TYPE_ALIGN (type))),
5984 round_up (TYPE_SIZE (type),
5985 MAX (align, TYPE_ALIGN (type))),
5987 && (align == 0 || align == TYPE_ALIGN (type)))
5991 size = TYPE_SIZE (type);
5993 align = TYPE_ALIGN (type);
5995 type = TREE_TYPE (TYPE_FIELDS (type));
5996 orig_size = TYPE_SIZE (type);
5999 /* If the size is either not being changed or is being made smaller (which
6000 is not done here and is only valid for bitfields anyway), show the size
6001 isn't changing. Likewise, clear the alignment if it isn't being
6002 changed. Then return if we aren't doing anything. */
6004 && (operand_equal_p (size, orig_size, 0)
6005 || (TREE_CODE (orig_size) == INTEGER_CST
6006 && tree_int_cst_lt (size, orig_size))))
6009 if (align == TYPE_ALIGN (type))
6012 if (align == 0 && !size)
6015 /* If requested, complete the original type and give it a name. */
6017 create_type_decl (get_entity_name (gnat_entity), type,
6018 NULL, !Comes_From_Source (gnat_entity),
6020 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6021 && DECL_IGNORED_P (TYPE_NAME (type))),
6024 /* We used to modify the record in place in some cases, but that could
6025 generate incorrect debugging information. So make a new record
6027 record = make_node (RECORD_TYPE);
6028 TYPE_IS_PADDING_P (record) = 1;
6030 if (Present (gnat_entity))
6031 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
6033 TYPE_VOLATILE (record)
6034 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6036 TYPE_ALIGN (record) = align;
6038 TYPE_USER_ALIGN (record) = align;
6040 TYPE_SIZE (record) = size ? size : orig_size;
6041 TYPE_SIZE_UNIT (record)
6042 = convert (sizetype,
6043 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6044 bitsize_unit_node));
6046 /* If we are changing the alignment and the input type is a record with
6047 BLKmode and a small constant size, try to make a form that has an
6048 integral mode. This might allow the padding record to also have an
6049 integral mode, which will be much more efficient. There is no point
6050 in doing so if a size is specified unless it is also a small constant
6051 size and it is incorrect to do so if we cannot guarantee that the mode
6052 will be naturally aligned since the field must always be addressable.
6054 ??? This might not always be a win when done for a stand-alone object:
6055 since the nominal and the effective type of the object will now have
6056 different modes, a VIEW_CONVERT_EXPR will be required for converting
6057 between them and it might be hard to overcome afterwards, including
6058 at the RTL level when the stand-alone object is accessed as a whole. */
6060 && TREE_CODE (type) == RECORD_TYPE
6061 && TYPE_MODE (type) == BLKmode
6062 && TREE_CODE (orig_size) == INTEGER_CST
6063 && !TREE_OVERFLOW (orig_size)
6064 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6066 || (TREE_CODE (size) == INTEGER_CST
6067 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6069 tree packable_type = make_packable_type (type, true);
6070 if (TYPE_MODE (packable_type) != BLKmode
6071 && align >= TYPE_ALIGN (packable_type))
6072 type = packable_type;
6075 /* Now create the field with the original size. */
6076 field = create_field_decl (get_identifier ("F"), type, record, 0,
6077 orig_size, bitsize_zero_node, 1);
6078 DECL_INTERNAL_P (field) = 1;
6080 /* Do not finalize it until after the auxiliary record is built. */
6081 finish_record_type (record, field, 1, true);
6083 /* Set the same size for its RM size if requested; otherwise reuse
6084 the RM size of the original type. */
6085 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6087 /* Unless debugging information isn't being written for the input type,
6088 write a record that shows what we are a subtype of and also make a
6089 variable that indicates our size, if still variable. */
6090 if (TYPE_NAME (record)
6091 && AGGREGATE_TYPE_P (type)
6092 && TREE_CODE (orig_size) != INTEGER_CST
6093 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6094 && DECL_IGNORED_P (TYPE_NAME (type))))
6096 tree marker = make_node (RECORD_TYPE);
6097 tree name = TYPE_NAME (record);
6098 tree orig_name = TYPE_NAME (type);
6100 if (TREE_CODE (name) == TYPE_DECL)
6101 name = DECL_NAME (name);
6103 if (TREE_CODE (orig_name) == TYPE_DECL)
6104 orig_name = DECL_NAME (orig_name);
6106 TYPE_NAME (marker) = concat_name (name, "XVS");
6107 finish_record_type (marker,
6108 create_field_decl (orig_name, integer_type_node,
6109 marker, 0, NULL_TREE, NULL_TREE,
6113 add_parallel_type (TYPE_STUB_DECL (record), marker);
6115 if (size && TREE_CODE (size) != INTEGER_CST && definition)
6116 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6117 TYPE_SIZE_UNIT (record), false, false, false,
6118 false, NULL, gnat_entity);
6121 rest_of_record_type_compilation (record);
6123 /* If the size was widened explicitly, maybe give a warning. Take the
6124 original size as the maximum size of the input if there was an
6125 unconstrained record involved and round it up to the specified alignment,
6126 if one was specified. */
6127 if (CONTAINS_PLACEHOLDER_P (orig_size))
6128 orig_size = max_size (orig_size, true);
6131 orig_size = round_up (orig_size, align);
6133 if (size && Present (gnat_entity)
6134 && !operand_equal_p (size, orig_size, 0)
6135 && !(TREE_CODE (size) == INTEGER_CST
6136 && TREE_CODE (orig_size) == INTEGER_CST
6137 && tree_int_cst_lt (size, orig_size)))
6139 Node_Id gnat_error_node = Empty;
6141 if (Is_Packed_Array_Type (gnat_entity))
6142 gnat_entity = Original_Array_Type (gnat_entity);
6144 if ((Ekind (gnat_entity) == E_Component
6145 || Ekind (gnat_entity) == E_Discriminant)
6146 && Present (Component_Clause (gnat_entity)))
6147 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6148 else if (Present (Size_Clause (gnat_entity)))
6149 gnat_error_node = Expression (Size_Clause (gnat_entity));
6151 /* Generate message only for entities that come from source, since
6152 if we have an entity created by expansion, the message will be
6153 generated for some other corresponding source entity. */
6154 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
6155 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
6157 size_diffop (size, orig_size));
6159 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
6160 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6161 gnat_entity, gnat_entity,
6162 size_diffop (size, orig_size));
6168 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6169 the value passed against the list of choices. */
6172 choices_to_gnu (tree operand, Node_Id choices)
6176 tree result = integer_zero_node;
6177 tree this_test, low = 0, high = 0, single = 0;
6179 for (choice = First (choices); Present (choice); choice = Next (choice))
6181 switch (Nkind (choice))
6184 low = gnat_to_gnu (Low_Bound (choice));
6185 high = gnat_to_gnu (High_Bound (choice));
6187 /* There's no good type to use here, so we might as well use
6188 integer_type_node. */
6190 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6191 build_binary_op (GE_EXPR, integer_type_node,
6193 build_binary_op (LE_EXPR, integer_type_node,
6198 case N_Subtype_Indication:
6199 gnat_temp = Range_Expression (Constraint (choice));
6200 low = gnat_to_gnu (Low_Bound (gnat_temp));
6201 high = gnat_to_gnu (High_Bound (gnat_temp));
6204 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6205 build_binary_op (GE_EXPR, integer_type_node,
6207 build_binary_op (LE_EXPR, integer_type_node,
6212 case N_Expanded_Name:
6213 /* This represents either a subtype range, an enumeration
6214 literal, or a constant Ekind says which. If an enumeration
6215 literal or constant, fall through to the next case. */
6216 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6217 && Ekind (Entity (choice)) != E_Constant)
6219 tree type = gnat_to_gnu_type (Entity (choice));
6221 low = TYPE_MIN_VALUE (type);
6222 high = TYPE_MAX_VALUE (type);
6225 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6226 build_binary_op (GE_EXPR, integer_type_node,
6228 build_binary_op (LE_EXPR, integer_type_node,
6233 /* ... fall through ... */
6235 case N_Character_Literal:
6236 case N_Integer_Literal:
6237 single = gnat_to_gnu (choice);
6238 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6242 case N_Others_Choice:
6243 this_test = integer_one_node;
6250 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6257 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6258 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6261 adjust_packed (tree field_type, tree record_type, int packed)
6263 /* If the field contains an item of variable size, we cannot pack it
6264 because we cannot create temporaries of non-fixed size in case
6265 we need to take the address of the field. See addressable_p and
6266 the notes on the addressability issues for further details. */
6267 if (is_variable_size (field_type))
6270 /* If the alignment of the record is specified and the field type
6271 is over-aligned, request Storage_Unit alignment for the field. */
6274 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6283 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6284 placed in GNU_RECORD_TYPE.
6286 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6287 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6288 record has a specified alignment.
6290 DEFINITION is true if this field is for a record being defined. */
6293 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6296 tree gnu_field_id = get_entity_name (gnat_field);
6297 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6298 tree gnu_field, gnu_size, gnu_pos;
6299 bool needs_strict_alignment
6300 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6301 || Treat_As_Volatile (gnat_field));
6303 /* If this field requires strict alignment, we cannot pack it because
6304 it would very likely be under-aligned in the record. */
6305 if (needs_strict_alignment)
6308 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6310 /* If a size is specified, use it. Otherwise, if the record type is packed,
6311 use the official RM size. See "Handling of Type'Size Values" in Einfo
6312 for further details. */
6313 if (Known_Static_Esize (gnat_field))
6314 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6315 gnat_field, FIELD_DECL, false, true);
6316 else if (packed == 1)
6317 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6318 gnat_field, FIELD_DECL, false, true);
6320 gnu_size = NULL_TREE;
6322 /* If we have a specified size that's smaller than that of the field type,
6323 or a position is specified, and the field type is a record, see if we can
6324 get either an integral mode form of the type or a smaller form. If we
6325 can, show a size was specified for the field if there wasn't one already,
6326 so we know to make this a bitfield and avoid making things wider.
6328 Doing this is first useful if the record is packed because we may then
6329 place the field at a non-byte-aligned position and so achieve tighter
6332 This is in addition *required* if the field shares a byte with another
6333 field and the front-end lets the back-end handle the references, because
6334 GCC does not handle BLKmode bitfields properly.
6336 We avoid the transformation if it is not required or potentially useful,
6337 as it might entail an increase of the field's alignment and have ripple
6338 effects on the outer record type. A typical case is a field known to be
6339 byte aligned and not to share a byte with another field.
6341 Besides, we don't even look the possibility of a transformation in cases
6342 known to be in error already, for instance when an invalid size results
6343 from a component clause. */
6345 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6346 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
6347 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6350 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6351 || Present (Component_Clause (gnat_field))))))
6353 /* See what the alternate type and size would be. */
6354 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6356 bool has_byte_aligned_clause
6357 = Present (Component_Clause (gnat_field))
6358 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6359 % BITS_PER_UNIT == 0);
6361 /* Compute whether we should avoid the substitution. */
6363 /* There is no point substituting if there is no change... */
6364 = (gnu_packable_type == gnu_field_type)
6365 /* ... nor when the field is known to be byte aligned and not to
6366 share a byte with another field. */
6367 || (has_byte_aligned_clause
6368 && value_factor_p (gnu_size, BITS_PER_UNIT))
6369 /* The size of an aliased field must be an exact multiple of the
6370 type's alignment, which the substitution might increase. Reject
6371 substitutions that would so invalidate a component clause when the
6372 specified position is byte aligned, as the change would have no
6373 real benefit from the packing standpoint anyway. */
6374 || (Is_Aliased (gnat_field)
6375 && has_byte_aligned_clause
6376 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6378 /* Substitute unless told otherwise. */
6381 gnu_field_type = gnu_packable_type;
6384 gnu_size = rm_size (gnu_field_type);
6388 /* If we are packing the record and the field is BLKmode, round the
6389 size up to a byte boundary. */
6390 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6391 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6393 if (Present (Component_Clause (gnat_field)))
6395 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6396 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6397 gnat_field, FIELD_DECL, false, true);
6399 /* Ensure the position does not overlap with the parent subtype,
6401 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6404 = gnat_to_gnu_type (Parent_Subtype
6405 (Underlying_Type (Scope (gnat_field))));
6407 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6408 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6411 ("offset of& must be beyond parent{, minimum allowed is ^}",
6412 First_Bit (Component_Clause (gnat_field)), gnat_field,
6413 TYPE_SIZE_UNIT (gnu_parent));
6417 /* If this field needs strict alignment, ensure the record is
6418 sufficiently aligned and that that position and size are
6419 consistent with the alignment. */
6420 if (needs_strict_alignment)
6422 TYPE_ALIGN (gnu_record_type)
6423 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6426 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6428 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6430 ("atomic field& must be natural size of type{ (^)}",
6431 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6432 TYPE_SIZE (gnu_field_type));
6434 else if (Is_Aliased (gnat_field))
6436 ("size of aliased field& must be ^ bits",
6437 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6438 TYPE_SIZE (gnu_field_type));
6440 else if (Strict_Alignment (Etype (gnat_field)))
6442 ("size of & with aliased or tagged components not ^ bits",
6443 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6444 TYPE_SIZE (gnu_field_type));
6446 gnu_size = NULL_TREE;
6449 if (!integer_zerop (size_binop
6450 (TRUNC_MOD_EXPR, gnu_pos,
6451 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6453 if (Is_Aliased (gnat_field))
6455 ("position of aliased field& must be multiple of ^ bits",
6456 First_Bit (Component_Clause (gnat_field)), gnat_field,
6457 TYPE_ALIGN (gnu_field_type));
6459 else if (Treat_As_Volatile (gnat_field))
6461 ("position of volatile field& must be multiple of ^ bits",
6462 First_Bit (Component_Clause (gnat_field)), gnat_field,
6463 TYPE_ALIGN (gnu_field_type));
6465 else if (Strict_Alignment (Etype (gnat_field)))
6467 ("position of & with aliased or tagged components not multiple of ^ bits",
6468 First_Bit (Component_Clause (gnat_field)), gnat_field,
6469 TYPE_ALIGN (gnu_field_type));
6474 gnu_pos = NULL_TREE;
6478 if (Is_Atomic (gnat_field))
6479 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6482 /* If the record has rep clauses and this is the tag field, make a rep
6483 clause for it as well. */
6484 else if (Has_Specified_Layout (Scope (gnat_field))
6485 && Chars (gnat_field) == Name_uTag)
6487 gnu_pos = bitsize_zero_node;
6488 gnu_size = TYPE_SIZE (gnu_field_type);
6492 gnu_pos = NULL_TREE;
6494 /* We need to make the size the maximum for the type if it is
6495 self-referential and an unconstrained type. In that case, we can't
6496 pack the field since we can't make a copy to align it. */
6497 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6499 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6500 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6502 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6506 /* If a size is specified, adjust the field's type to it. */
6509 /* If the field's type is justified modular, we would need to remove
6510 the wrapper to (better) meet the layout requirements. However we
6511 can do so only if the field is not aliased to preserve the unique
6512 layout and if the prescribed size is not greater than that of the
6513 packed array to preserve the justification. */
6514 if (!needs_strict_alignment
6515 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6516 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6517 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6519 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6522 = make_type_from_size (gnu_field_type, gnu_size,
6523 Has_Biased_Representation (gnat_field));
6524 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6525 "PAD", false, definition, true);
6528 /* Otherwise (or if there was an error), don't specify a position. */
6530 gnu_pos = NULL_TREE;
6532 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6533 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6535 /* Now create the decl for the field. */
6536 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6537 packed, gnu_size, gnu_pos,
6538 Is_Aliased (gnat_field));
6539 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6540 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6542 if (Ekind (gnat_field) == E_Discriminant)
6543 DECL_DISCRIMINANT_NUMBER (gnu_field)
6544 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6549 /* Return true if TYPE is a type with variable size, a padding type with a
6550 field of variable size or is a record that has a field such a field. */
6553 is_variable_size (tree type)
6557 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6560 if (TREE_CODE (type) == RECORD_TYPE
6561 && TYPE_IS_PADDING_P (type)
6562 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6565 if (TREE_CODE (type) != RECORD_TYPE
6566 && TREE_CODE (type) != UNION_TYPE
6567 && TREE_CODE (type) != QUAL_UNION_TYPE)
6570 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6571 if (is_variable_size (TREE_TYPE (field)))
6577 /* qsort comparer for the bit positions of two record components. */
6580 compare_field_bitpos (const PTR rt1, const PTR rt2)
6582 const_tree const field1 = * (const_tree const *) rt1;
6583 const_tree const field2 = * (const_tree const *) rt2;
6585 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6587 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6590 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
6591 of GCC trees for fields that are in the record and have already been
6592 processed. When called from gnat_to_gnu_entity during the processing of a
6593 record type definition, the GCC nodes for the discriminants will be on
6594 the chain. The other calls to this function are recursive calls from
6595 itself for the Component_List of a variant and the chain is empty.
6597 PACKED is 1 if this is for a packed record, -1 if this is for a record
6598 with Component_Alignment of Storage_Unit, -2 if this is for a record
6599 with a specified alignment.
6601 DEFINITION is true if we are defining this record.
6603 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6604 with a rep clause is to be added. If it is nonzero, that is all that
6605 should be done with such fields.
6607 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6608 laying out the record. This means the alignment only serves to force fields
6609 to be bitfields, but not require the record to be that aligned. This is
6612 ALL_REP, if true, means a rep clause was found for all the fields. This
6613 simplifies the logic since we know we're not in the mixed case.
6615 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6616 modified afterwards so it will not be sent to the back-end for finalization.
6618 UNCHECKED_UNION, if true, means that we are building a type for a record
6619 with a Pragma Unchecked_Union.
6621 The processing of the component list fills in the chain with all of the
6622 fields of the record and then the record type is finished. */
6625 components_to_record (tree gnu_record_type, Node_Id component_list,
6626 tree gnu_field_list, int packed, bool definition,
6627 tree *p_gnu_rep_list, bool cancel_alignment,
6628 bool all_rep, bool do_not_finalize, bool unchecked_union)
6630 Node_Id component_decl;
6631 Entity_Id gnat_field;
6632 Node_Id variant_part;
6633 tree gnu_our_rep_list = NULL_TREE;
6634 tree gnu_field, gnu_last;
6635 bool layout_with_rep = false;
6636 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6638 /* For each variable within each component declaration create a GCC field
6639 and add it to the list, skipping any pragmas in the list. */
6640 if (Present (Component_Items (component_list)))
6641 for (component_decl = First_Non_Pragma (Component_Items (component_list));
6642 Present (component_decl);
6643 component_decl = Next_Non_Pragma (component_decl))
6645 gnat_field = Defining_Entity (component_decl);
6647 if (Chars (gnat_field) == Name_uParent)
6648 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
6651 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6652 packed, definition);
6654 /* If this is the _Tag field, put it before any discriminants,
6655 instead of after them as is the case for all other fields. */
6656 if (Chars (gnat_field) == Name_uTag)
6657 gnu_field_list = chainon (gnu_field_list, gnu_field);
6660 TREE_CHAIN (gnu_field) = gnu_field_list;
6661 gnu_field_list = gnu_field;
6665 save_gnu_tree (gnat_field, gnu_field, false);
6668 /* At the end of the component list there may be a variant part. */
6669 variant_part = Variant_Part (component_list);
6671 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6672 mutually exclusive and should go in the same memory. To do this we need
6673 to treat each variant as a record whose elements are created from the
6674 component list for the variant. So here we create the records from the
6675 lists for the variants and put them all into the QUAL_UNION_TYPE.
6676 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6677 use GNU_RECORD_TYPE if there are no fields so far. */
6678 if (Present (variant_part))
6680 Node_Id gnat_discr = Name (variant_part), variant;
6681 tree gnu_discr = gnat_to_gnu (gnat_discr);
6682 tree gnu_name = TYPE_NAME (gnu_record_type);
6684 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6686 tree gnu_union_type, gnu_union_name, gnu_union_field;
6687 tree gnu_variant_list = NULL_TREE;
6689 if (TREE_CODE (gnu_name) == TYPE_DECL)
6690 gnu_name = DECL_NAME (gnu_name);
6693 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6695 /* Reuse an enclosing union if all fields are in the variant part
6696 and there is no representation clause on the record, to match
6697 the layout of C unions. There is an associated check below. */
6699 && TREE_CODE (gnu_record_type) == UNION_TYPE
6700 && !TYPE_PACKED (gnu_record_type))
6701 gnu_union_type = gnu_record_type;
6705 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6707 TYPE_NAME (gnu_union_type) = gnu_union_name;
6708 TYPE_ALIGN (gnu_union_type) = 0;
6709 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6712 for (variant = First_Non_Pragma (Variants (variant_part));
6714 variant = Next_Non_Pragma (variant))
6716 tree gnu_variant_type = make_node (RECORD_TYPE);
6717 tree gnu_inner_name;
6720 Get_Variant_Encoding (variant);
6721 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6722 TYPE_NAME (gnu_variant_type)
6723 = concat_name (gnu_union_name,
6724 IDENTIFIER_POINTER (gnu_inner_name));
6726 /* Set the alignment of the inner type in case we need to make
6727 inner objects into bitfields, but then clear it out
6728 so the record actually gets only the alignment required. */
6729 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6730 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6732 /* Similarly, if the outer record has a size specified and all fields
6733 have record rep clauses, we can propagate the size into the
6735 if (all_rep_and_size)
6737 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6738 TYPE_SIZE_UNIT (gnu_variant_type)
6739 = TYPE_SIZE_UNIT (gnu_record_type);
6742 /* Create the record type for the variant. Note that we defer
6743 finalizing it until after we are sure to actually use it. */
6744 components_to_record (gnu_variant_type, Component_List (variant),
6745 NULL_TREE, packed, definition,
6746 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6747 true, unchecked_union);
6749 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6751 Set_Present_Expr (variant, annotate_value (gnu_qual));
6753 /* If this is an Unchecked_Union and we have exactly one field,
6754 use this field directly to match the layout of C unions. */
6756 && TYPE_FIELDS (gnu_variant_type)
6757 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6758 gnu_field = TYPE_FIELDS (gnu_variant_type);
6761 /* Deal with packedness like in gnat_to_gnu_field. */
6763 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6765 /* Finalize the record type now. We used to throw away
6766 empty records but we no longer do that because we need
6767 them to generate complete debug info for the variant;
6768 otherwise, the union type definition will be lacking
6769 the fields associated with these empty variants. */
6770 rest_of_record_type_compilation (gnu_variant_type);
6772 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6773 gnu_union_type, field_packed,
6775 ? TYPE_SIZE (gnu_variant_type)
6778 ? bitsize_zero_node : 0),
6781 DECL_INTERNAL_P (gnu_field) = 1;
6783 if (!unchecked_union)
6784 DECL_QUALIFIER (gnu_field) = gnu_qual;
6787 TREE_CHAIN (gnu_field) = gnu_variant_list;
6788 gnu_variant_list = gnu_field;
6791 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
6792 if (gnu_variant_list)
6794 int union_field_packed;
6796 if (all_rep_and_size)
6798 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6799 TYPE_SIZE_UNIT (gnu_union_type)
6800 = TYPE_SIZE_UNIT (gnu_record_type);
6803 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6804 all_rep_and_size ? 1 : 0, false);
6806 /* If GNU_UNION_TYPE is our record type, it means we must have an
6807 Unchecked_Union with no fields. Verify that and, if so, just
6809 if (gnu_union_type == gnu_record_type)
6811 gcc_assert (unchecked_union
6813 && !gnu_our_rep_list);
6817 /* Deal with packedness like in gnat_to_gnu_field. */
6819 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6822 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6824 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6825 all_rep ? bitsize_zero_node : 0, 0);
6827 DECL_INTERNAL_P (gnu_union_field) = 1;
6828 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6829 gnu_field_list = gnu_union_field;
6833 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6834 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
6835 in a separate pass since we want to handle the discriminants but can't
6836 play with them until we've used them in debugging data above.
6838 ??? Note: if we then reorder them, debugging information will be wrong,
6839 but there's nothing that can be done about this at the moment. */
6840 for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; )
6842 if (DECL_FIELD_OFFSET (gnu_field))
6844 tree gnu_next = TREE_CHAIN (gnu_field);
6847 gnu_field_list = gnu_next;
6849 TREE_CHAIN (gnu_last) = gnu_next;
6851 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6852 gnu_our_rep_list = gnu_field;
6853 gnu_field = gnu_next;
6857 gnu_last = gnu_field;
6858 gnu_field = TREE_CHAIN (gnu_field);
6862 /* If we have any items in our rep'ed field list, it is not the case that all
6863 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
6864 set it and ignore the items. */
6865 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6866 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6867 else if (gnu_our_rep_list)
6869 /* Otherwise, sort the fields by bit position and put them into their
6870 own record if we have any fields without rep clauses. */
6872 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6873 int len = list_length (gnu_our_rep_list);
6874 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6877 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
6878 gnu_field = TREE_CHAIN (gnu_field), i++)
6879 gnu_arr[i] = gnu_field;
6881 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6883 /* Put the fields in the list in order of increasing position, which
6884 means we start from the end. */
6885 gnu_our_rep_list = NULL_TREE;
6886 for (i = len - 1; i >= 0; i--)
6888 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6889 gnu_our_rep_list = gnu_arr[i];
6890 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
6895 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
6896 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
6897 gnu_record_type, 0, 0, 0, 1);
6898 DECL_INTERNAL_P (gnu_field) = 1;
6899 gnu_field_list = chainon (gnu_field_list, gnu_field);
6903 layout_with_rep = true;
6904 gnu_field_list = nreverse (gnu_our_rep_list);
6908 if (cancel_alignment)
6909 TYPE_ALIGN (gnu_record_type) = 0;
6911 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
6912 layout_with_rep ? 1 : 0, do_not_finalize);
6915 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
6916 placed into an Esize, Component_Bit_Offset, or Component_Size value
6917 in the GNAT tree. */
6920 annotate_value (tree gnu_size)
6922 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
6924 Node_Ref_Or_Val ops[3], ret;
6927 struct tree_int_map **h = NULL;
6929 /* See if we've already saved the value for this node. */
6930 if (EXPR_P (gnu_size))
6932 struct tree_int_map in;
6933 if (!annotate_value_cache)
6934 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
6935 tree_int_map_eq, 0);
6936 in.base.from = gnu_size;
6937 h = (struct tree_int_map **)
6938 htab_find_slot (annotate_value_cache, &in, INSERT);
6941 return (Node_Ref_Or_Val) (*h)->to;
6944 /* If we do not return inside this switch, TCODE will be set to the
6945 code to use for a Create_Node operand and LEN (set above) will be
6946 the number of recursive calls for us to make. */
6948 switch (TREE_CODE (gnu_size))
6951 if (TREE_OVERFLOW (gnu_size))
6954 /* This may have come from a conversion from some smaller type,
6955 so ensure this is in bitsizetype. */
6956 gnu_size = convert (bitsizetype, gnu_size);
6958 /* For negative values, use NEGATE_EXPR of the supplied value. */
6959 if (tree_int_cst_sgn (gnu_size) < 0)
6961 /* The ridiculous code below is to handle the case of the largest
6962 negative integer. */
6963 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
6964 bool adjust = false;
6967 if (TREE_OVERFLOW (negative_size))
6970 = size_binop (MINUS_EXPR, bitsize_zero_node,
6971 size_binop (PLUS_EXPR, gnu_size,
6976 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
6978 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
6980 return annotate_value (temp);
6983 if (!host_integerp (gnu_size, 1))
6986 size = tree_low_cst (gnu_size, 1);
6988 /* This peculiar test is to make sure that the size fits in an int
6989 on machines where HOST_WIDE_INT is not "int". */
6990 if (tree_low_cst (gnu_size, 1) == size)
6991 return UI_From_Int (size);
6996 /* The only case we handle here is a simple discriminant reference. */
6997 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
6998 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
6999 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7000 return Create_Node (Discrim_Val,
7001 annotate_value (DECL_DISCRIMINANT_NUMBER
7002 (TREE_OPERAND (gnu_size, 1))),
7007 CASE_CONVERT: case NON_LVALUE_EXPR:
7008 return annotate_value (TREE_OPERAND (gnu_size, 0));
7010 /* Now just list the operations we handle. */
7011 case COND_EXPR: tcode = Cond_Expr; break;
7012 case PLUS_EXPR: tcode = Plus_Expr; break;
7013 case MINUS_EXPR: tcode = Minus_Expr; break;
7014 case MULT_EXPR: tcode = Mult_Expr; break;
7015 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7016 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7017 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7018 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7019 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7020 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7021 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7022 case NEGATE_EXPR: tcode = Negate_Expr; break;
7023 case MIN_EXPR: tcode = Min_Expr; break;
7024 case MAX_EXPR: tcode = Max_Expr; break;
7025 case ABS_EXPR: tcode = Abs_Expr; break;
7026 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7027 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7028 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7029 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7030 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7031 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7032 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7033 case LT_EXPR: tcode = Lt_Expr; break;
7034 case LE_EXPR: tcode = Le_Expr; break;
7035 case GT_EXPR: tcode = Gt_Expr; break;
7036 case GE_EXPR: tcode = Ge_Expr; break;
7037 case EQ_EXPR: tcode = Eq_Expr; break;
7038 case NE_EXPR: tcode = Ne_Expr; break;
7044 /* Now get each of the operands that's relevant for this code. If any
7045 cannot be expressed as a repinfo node, say we can't. */
7046 for (i = 0; i < 3; i++)
7049 for (i = 0; i < len; i++)
7051 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7052 if (ops[i] == No_Uint)
7056 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7058 /* Save the result in the cache. */
7061 *h = GGC_NEW (struct tree_int_map);
7062 (*h)->base.from = gnu_size;
7069 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
7070 GCC type, set Component_Bit_Offset and Esize to the position and size
7074 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7078 Entity_Id gnat_field;
7080 /* We operate by first making a list of all fields and their positions
7081 (we can get the sizes easily at any time) by a recursive call
7082 and then update all the sizes into the tree. */
7083 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
7084 size_zero_node, bitsize_zero_node,
7087 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
7088 gnat_field = Next_Entity (gnat_field))
7089 if ((Ekind (gnat_field) == E_Component
7090 || (Ekind (gnat_field) == E_Discriminant
7091 && !Is_Unchecked_Union (Scope (gnat_field)))))
7093 tree parent_offset = bitsize_zero_node;
7095 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
7100 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7102 /* In this mode the tag and parent components have not been
7103 generated, so we add the appropriate offset to each
7104 component. For a component appearing in the current
7105 extension, the offset is the size of the parent. */
7106 if (Is_Derived_Type (gnat_entity)
7107 && Original_Record_Component (gnat_field) == gnat_field)
7109 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7112 parent_offset = bitsize_int (POINTER_SIZE);
7115 Set_Component_Bit_Offset
7118 (size_binop (PLUS_EXPR,
7119 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
7120 TREE_VALUE (TREE_VALUE
7121 (TREE_VALUE (gnu_entry)))),
7124 Set_Esize (gnat_field,
7125 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
7127 else if (Is_Tagged_Type (gnat_entity)
7128 && Is_Derived_Type (gnat_entity))
7130 /* If there is no gnu_entry, this is an inherited component whose
7131 position is the same as in the parent type. */
7132 Set_Component_Bit_Offset
7134 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7135 Set_Esize (gnat_field,
7136 Esize (Original_Record_Component (gnat_field)));
7141 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
7142 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
7143 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
7144 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
7145 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
7146 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
7150 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
7151 tree gnu_bitpos, unsigned int offset_align)
7154 tree gnu_result = gnu_list;
7156 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
7157 gnu_field = TREE_CHAIN (gnu_field))
7159 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7160 DECL_FIELD_BIT_OFFSET (gnu_field));
7161 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7162 DECL_FIELD_OFFSET (gnu_field));
7163 unsigned int our_offset_align
7164 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7167 = tree_cons (gnu_field,
7168 tree_cons (gnu_our_offset,
7169 tree_cons (size_int (our_offset_align),
7170 gnu_our_bitpos, NULL_TREE),
7174 if (DECL_INTERNAL_P (gnu_field))
7176 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
7177 gnu_our_offset, gnu_our_bitpos,
7184 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7185 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7186 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7187 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7188 for the size of a field. COMPONENT_P is true if we are being called
7189 to process the Component_Size of GNAT_OBJECT. This is used for error
7190 message handling and to indicate to use the object size of GNU_TYPE.
7191 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7192 it means that a size of zero should be treated as an unspecified size. */
7195 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7196 enum tree_code kind, bool component_p, bool zero_ok)
7198 Node_Id gnat_error_node;
7199 tree type_size, size;
7201 if (kind == VAR_DECL
7202 /* If a type needs strict alignment, a component of this type in
7203 a packed record cannot be packed and thus uses the type size. */
7204 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7205 type_size = TYPE_SIZE (gnu_type);
7207 type_size = rm_size (gnu_type);
7209 /* Find the node to use for errors. */
7210 if ((Ekind (gnat_object) == E_Component
7211 || Ekind (gnat_object) == E_Discriminant)
7212 && Present (Component_Clause (gnat_object)))
7213 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7214 else if (Present (Size_Clause (gnat_object)))
7215 gnat_error_node = Expression (Size_Clause (gnat_object));
7217 gnat_error_node = gnat_object;
7219 /* Return 0 if no size was specified, either because Esize was not Present
7220 or the specified size was zero. */
7221 if (No (uint_size) || uint_size == No_Uint)
7224 /* Get the size as a tree. Issue an error if a size was specified but
7225 cannot be represented in sizetype. */
7226 size = UI_To_gnu (uint_size, bitsizetype);
7227 if (TREE_OVERFLOW (size))
7229 post_error_ne (component_p ? "component size of & is too large"
7230 : "size of & is too large",
7231 gnat_error_node, gnat_object);
7235 /* Ignore a negative size since that corresponds to our back-annotation.
7236 Also ignore a zero size if it is not permitted. */
7237 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7240 /* The size of objects is always a multiple of a byte. */
7241 if (kind == VAR_DECL
7242 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7245 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7246 gnat_error_node, gnat_object);
7248 post_error_ne ("size for& is not a multiple of Storage_Unit",
7249 gnat_error_node, gnat_object);
7253 /* If this is an integral type or a packed array type, the front-end has
7254 verified the size, so we need not do it here (which would entail
7255 checking against the bounds). However, if this is an aliased object,
7256 it may not be smaller than the type of the object. */
7257 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7258 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7261 /* If the object is a record that contains a template, add the size of
7262 the template to the specified size. */
7263 if (TREE_CODE (gnu_type) == RECORD_TYPE
7264 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7265 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7267 /* Modify the size of the type to be that of the maximum size if it has a
7269 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7270 type_size = max_size (type_size, true);
7272 /* If this is an access type or a fat pointer, the minimum size is that given
7273 by the smallest integral mode that's valid for pointers. */
7274 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7276 enum machine_mode p_mode;
7278 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7279 !targetm.valid_pointer_mode (p_mode);
7280 p_mode = GET_MODE_WIDER_MODE (p_mode))
7283 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7286 /* If the size of the object is a constant, the new size must not be
7288 if (TREE_CODE (type_size) != INTEGER_CST
7289 || TREE_OVERFLOW (type_size)
7290 || tree_int_cst_lt (size, type_size))
7294 ("component size for& too small{, minimum allowed is ^}",
7295 gnat_error_node, gnat_object, type_size);
7297 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7298 gnat_error_node, gnat_object, type_size);
7300 if (kind == VAR_DECL && !component_p
7301 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7302 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7303 post_error_ne_tree_2
7304 ("\\size of ^ is not a multiple of alignment (^ bits)",
7305 gnat_error_node, gnat_object, rm_size (gnu_type),
7306 TYPE_ALIGN (gnu_type));
7308 else if (INTEGRAL_TYPE_P (gnu_type))
7309 post_error_ne ("\\size would be legal if & were not aliased!",
7310 gnat_error_node, gnat_object);
7318 /* Similarly, but both validate and process a value of RM size. This
7319 routine is only called for types. */
7322 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7324 /* Only issue an error if a Value_Size clause was explicitly given.
7325 Otherwise, we'd be duplicating an error on the Size clause. */
7326 Node_Id gnat_attr_node
7327 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7328 tree old_size = rm_size (gnu_type), size;
7330 /* Do nothing if no size was specified, either because RM size was not
7331 Present or if the specified size was zero. */
7332 if (No (uint_size) || uint_size == No_Uint)
7335 /* Get the size as a tree. Issue an error if a size was specified but
7336 cannot be represented in sizetype. */
7337 size = UI_To_gnu (uint_size, bitsizetype);
7338 if (TREE_OVERFLOW (size))
7340 if (Present (gnat_attr_node))
7341 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7346 /* Ignore a negative size since that corresponds to our back-annotation.
7347 Also ignore a zero size unless a Value_Size clause exists, or a size
7348 clause exists, or this is an integer type, in which case the front-end
7349 will have always set it. */
7350 if (tree_int_cst_sgn (size) < 0
7351 || (integer_zerop (size)
7352 && No (gnat_attr_node)
7353 && !Has_Size_Clause (gnat_entity)
7354 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7357 /* If the old size is self-referential, get the maximum size. */
7358 if (CONTAINS_PLACEHOLDER_P (old_size))
7359 old_size = max_size (old_size, true);
7361 /* If the size of the object is a constant, the new size must not be
7362 smaller (the front-end checks this for scalar types). */
7363 if (TREE_CODE (old_size) != INTEGER_CST
7364 || TREE_OVERFLOW (old_size)
7365 || (AGGREGATE_TYPE_P (gnu_type) && tree_int_cst_lt (size, old_size)))
7367 if (Present (gnat_attr_node))
7369 ("Value_Size for& too small{, minimum allowed is ^}",
7370 gnat_attr_node, gnat_entity, old_size);
7374 /* Otherwise, set the RM size proper for numerical types... */
7375 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7376 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7377 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7378 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7379 TYPE_RM_SIZE (gnu_type) = size;
7381 /* ...or the Ada size for record and union types. */
7382 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7383 || TREE_CODE (gnu_type) == UNION_TYPE
7384 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7385 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7386 SET_TYPE_ADA_SIZE (gnu_type, size);
7389 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7390 If TYPE is the best type, return it. Otherwise, make a new type. We
7391 only support new integral and pointer types. FOR_BIASED is true if
7392 we are making a biased type. */
7395 make_type_from_size (tree type, tree size_tree, bool for_biased)
7397 unsigned HOST_WIDE_INT size;
7401 /* If size indicates an error, just return TYPE to avoid propagating
7402 the error. Likewise if it's too large to represent. */
7403 if (!size_tree || !host_integerp (size_tree, 1))
7406 size = tree_low_cst (size_tree, 1);
7408 switch (TREE_CODE (type))
7413 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7414 && TYPE_BIASED_REPRESENTATION_P (type));
7416 /* Only do something if the type is not a packed array type and
7417 doesn't already have the proper size. */
7418 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7419 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7422 biased_p |= for_biased;
7423 if (size > LONG_LONG_TYPE_SIZE)
7424 size = LONG_LONG_TYPE_SIZE;
7426 if (TYPE_UNSIGNED (type) || biased_p)
7427 new_type = make_unsigned_type (size);
7429 new_type = make_signed_type (size);
7430 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7431 TYPE_MIN_VALUE (new_type)
7432 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
7433 TYPE_MAX_VALUE (new_type)
7434 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
7435 /* Propagate the name to avoid creating a fake subrange type. */
7436 if (TYPE_NAME (type))
7438 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7439 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7441 TYPE_NAME (new_type) = TYPE_NAME (type);
7443 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7444 TYPE_RM_SIZE (new_type) = bitsize_int (size);
7448 /* Do something if this is a fat pointer, in which case we
7449 may need to return the thin pointer. */
7450 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7452 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7453 if (!targetm.valid_pointer_mode (p_mode))
7456 build_pointer_type_for_mode
7457 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7463 /* Only do something if this is a thin pointer, in which case we
7464 may need to return the fat pointer. */
7465 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7467 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7477 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7478 a type or object whose present alignment is ALIGN. If this alignment is
7479 valid, return it. Otherwise, give an error and return ALIGN. */
7482 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7484 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7485 unsigned int new_align;
7486 Node_Id gnat_error_node;
7488 /* Don't worry about checking alignment if alignment was not specified
7489 by the source program and we already posted an error for this entity. */
7490 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7493 /* Post the error on the alignment clause if any. */
7494 if (Present (Alignment_Clause (gnat_entity)))
7495 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7497 gnat_error_node = gnat_entity;
7499 /* Within GCC, an alignment is an integer, so we must make sure a value is
7500 specified that fits in that range. Also, there is an upper bound to
7501 alignments we can support/allow. */
7502 if (!UI_Is_In_Int_Range (alignment)
7503 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7504 post_error_ne_num ("largest supported alignment for& is ^",
7505 gnat_error_node, gnat_entity, max_allowed_alignment);
7506 else if (!(Present (Alignment_Clause (gnat_entity))
7507 && From_At_Mod (Alignment_Clause (gnat_entity)))
7508 && new_align * BITS_PER_UNIT < align)
7509 post_error_ne_num ("alignment for& must be at least ^",
7510 gnat_error_node, gnat_entity,
7511 align / BITS_PER_UNIT);
7514 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7515 if (new_align > align)
7522 /* Return the smallest alignment not less than SIZE. */
7525 ceil_alignment (unsigned HOST_WIDE_INT size)
7527 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7530 /* Verify that OBJECT, a type or decl, is something we can implement
7531 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7532 if we require atomic components. */
7535 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7537 Node_Id gnat_error_point = gnat_entity;
7539 enum machine_mode mode;
7543 /* There are three case of what OBJECT can be. It can be a type, in which
7544 case we take the size, alignment and mode from the type. It can be a
7545 declaration that was indirect, in which case the relevant values are
7546 that of the type being pointed to, or it can be a normal declaration,
7547 in which case the values are of the decl. The code below assumes that
7548 OBJECT is either a type or a decl. */
7549 if (TYPE_P (object))
7551 mode = TYPE_MODE (object);
7552 align = TYPE_ALIGN (object);
7553 size = TYPE_SIZE (object);
7555 else if (DECL_BY_REF_P (object))
7557 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7558 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7559 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7563 mode = DECL_MODE (object);
7564 align = DECL_ALIGN (object);
7565 size = DECL_SIZE (object);
7568 /* Consider all floating-point types atomic and any types that that are
7569 represented by integers no wider than a machine word. */
7570 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7571 || ((GET_MODE_CLASS (mode) == MODE_INT
7572 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7573 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7576 /* For the moment, also allow anything that has an alignment equal
7577 to its size and which is smaller than a word. */
7578 if (size && TREE_CODE (size) == INTEGER_CST
7579 && compare_tree_int (size, align) == 0
7580 && align <= BITS_PER_WORD)
7583 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7584 gnat_node = Next_Rep_Item (gnat_node))
7586 if (!comp_p && Nkind (gnat_node) == N_Pragma
7587 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7589 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7590 else if (comp_p && Nkind (gnat_node) == N_Pragma
7591 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7592 == Pragma_Atomic_Components))
7593 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7597 post_error_ne ("atomic access to component of & cannot be guaranteed",
7598 gnat_error_point, gnat_entity);
7600 post_error_ne ("atomic access to & cannot be guaranteed",
7601 gnat_error_point, gnat_entity);
7604 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7605 have compatible signatures so that a call using one type may be safely
7606 issued if the actual target function type is the other. Return 1 if it is
7607 the case, 0 otherwise, and post errors on the incompatibilities.
7609 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7610 that calls to the subprogram will have arguments suitable for the later
7611 underlying builtin expansion. */
7614 compatible_signatures_p (tree ftype1, tree ftype2)
7616 /* As of now, we only perform very trivial tests and consider it's the
7617 programmer's responsibility to ensure the type correctness in the Ada
7618 declaration, as in the regular Import cases.
7620 Mismatches typically result in either error messages from the builtin
7621 expander, internal compiler errors, or in a real call sequence. This
7622 should be refined to issue diagnostics helping error detection and
7625 /* Almost fake test, ensuring a use of each argument. */
7626 if (ftype1 == ftype2)
7632 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
7633 type with all size expressions that contain F in a PLACEHOLDER_EXPR
7634 updated by replacing F with R.
7636 The function doesn't update the layout of the type, i.e. it assumes
7637 that the substitution is purely formal. That's why the replacement
7638 value R must itself contain a PLACEHOLDER_EXPR. */
7641 substitute_in_type (tree t, tree f, tree r)
7645 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
7647 switch (TREE_CODE (t))
7652 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7653 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7655 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7656 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7658 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7661 new = copy_type (t);
7662 TYPE_MIN_VALUE (new) = low;
7663 TYPE_MAX_VALUE (new) = high;
7664 if (TYPE_INDEX_TYPE (t))
7666 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7673 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7674 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7676 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7677 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7679 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7682 new = copy_type (t);
7683 TYPE_MIN_VALUE (new) = low;
7684 TYPE_MAX_VALUE (new) = high;
7691 new = substitute_in_type (TREE_TYPE (t), f, r);
7692 if (new == TREE_TYPE (t))
7695 return build_complex_type (new);
7701 /* These should never show up here. */
7706 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7707 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7709 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7712 new = build_array_type (component, domain);
7713 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7714 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7715 SET_TYPE_MODE (new, TYPE_MODE (t));
7716 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7717 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7718 TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t);
7719 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7720 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7726 case QUAL_UNION_TYPE:
7728 bool changed_field = false;
7731 /* Start out with no fields, make new fields, and chain them
7732 in. If we haven't actually changed the type of any field,
7733 discard everything we've done and return the old type. */
7734 new = copy_type (t);
7735 TYPE_FIELDS (new) = NULL_TREE;
7737 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7739 tree new_field = copy_node (field), new_n;
7741 new_n = substitute_in_type (TREE_TYPE (field), f, r);
7742 if (new_n != TREE_TYPE (field))
7744 TREE_TYPE (new_field) = new_n;
7745 changed_field = true;
7748 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
7749 if (new_n != DECL_FIELD_OFFSET (field))
7751 DECL_FIELD_OFFSET (new_field) = new_n;
7752 changed_field = true;
7755 /* Do the substitution inside the qualifier, if any. */
7756 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7758 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7759 if (new_n != DECL_QUALIFIER (field))
7761 DECL_QUALIFIER (new_field) = new_n;
7762 changed_field = true;
7766 DECL_CONTEXT (new_field) = new;
7767 SET_DECL_ORIGINAL_FIELD (new_field,
7768 (DECL_ORIGINAL_FIELD (field)
7769 ? DECL_ORIGINAL_FIELD (field) : field));
7771 TREE_CHAIN (new_field) = TYPE_FIELDS (new);
7772 TYPE_FIELDS (new) = new_field;
7778 TYPE_FIELDS (new) = nreverse (TYPE_FIELDS (new));
7779 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7780 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7781 SET_TYPE_ADA_SIZE (new, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
7790 /* Return the RM size of GNU_TYPE. This is the actual number of bits
7791 needed to represent the object. */
7794 rm_size (tree gnu_type)
7796 /* For integer types, this is the precision. */
7797 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7798 return TYPE_RM_SIZE (gnu_type);
7800 /* Return the RM size of the actual data plus the size of the template. */
7801 if (TREE_CODE (gnu_type) == RECORD_TYPE
7802 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7804 size_binop (PLUS_EXPR,
7805 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7806 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7808 /* For record types, we store the size explicitly. */
7809 if ((TREE_CODE (gnu_type) == RECORD_TYPE
7810 || TREE_CODE (gnu_type) == UNION_TYPE
7811 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7812 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7813 && TYPE_ADA_SIZE (gnu_type))
7814 return TYPE_ADA_SIZE (gnu_type);
7816 /* For other types, this is just the size. */
7817 return TYPE_SIZE (gnu_type);
7820 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7821 fully-qualified name, possibly with type information encoding.
7822 Otherwise, return the name. */
7825 get_entity_name (Entity_Id gnat_entity)
7827 Get_Encoded_Name (gnat_entity);
7828 return get_identifier_with_length (Name_Buffer, Name_Len);
7831 /* Return an identifier representing the external name to be used for
7832 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7833 and the specified suffix. */
7836 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7838 Entity_Kind kind = Ekind (gnat_entity);
7842 String_Template temp = {1, strlen (suffix)};
7843 Fat_Pointer fp = {suffix, &temp};
7844 Get_External_Name_With_Suffix (gnat_entity, fp);
7847 Get_External_Name (gnat_entity, 0);
7849 /* A variable using the Stdcall convention lives in a DLL. We adjust
7850 its name to use the jump table, the _imp__NAME contains the address
7851 for the NAME variable. */
7852 if ((kind == E_Variable || kind == E_Constant)
7853 && Has_Stdcall_Convention (gnat_entity))
7855 const int len = 6 + Name_Len;
7856 char *new_name = (char *) alloca (len + 1);
7857 strcpy (new_name, "_imp__");
7858 strcat (new_name, Name_Buffer);
7859 return get_identifier_with_length (new_name, len);
7862 return get_identifier_with_length (Name_Buffer, Name_Len);
7865 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
7866 string, return a new IDENTIFIER_NODE that is the concatenation of
7867 the name followed by "___" and the specified suffix. */
7870 concat_name (tree gnu_name, const char *suffix)
7872 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
7873 char *new_name = (char *) alloca (len + 1);
7874 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
7875 strcat (new_name, "___");
7876 strcat (new_name, suffix);
7877 return get_identifier_with_length (new_name, len);
7880 #include "gt-ada-decl.h"