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!",
1203 = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1204 Empty, Empty, gnat_entity, mutable_p);
1208 gnu_expr = NULL_TREE;
1213 /* If this object would go into the stack and has an alignment larger
1214 than the largest stack alignment the back-end can honor, resort to
1215 a variable of "aligning type". */
1216 if (!global_bindings_p () && !static_p && definition
1217 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1219 /* Create the new variable. No need for extra room before the
1220 aligned field as this is in automatic storage. */
1222 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1223 TYPE_SIZE_UNIT (gnu_type),
1224 BIGGEST_ALIGNMENT, 0);
1226 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1227 NULL_TREE, gnu_new_type, NULL_TREE, false,
1228 false, false, false, NULL, gnat_entity);
1230 /* Initialize the aligned field if we have an initializer. */
1233 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1235 (gnu_new_var, NULL_TREE,
1236 TYPE_FIELDS (gnu_new_type), false),
1240 /* And setup this entity as a reference to the aligned field. */
1241 gnu_type = build_reference_type (gnu_type);
1244 (ADDR_EXPR, gnu_type,
1245 build_component_ref (gnu_new_var, NULL_TREE,
1246 TYPE_FIELDS (gnu_new_type), false));
1248 gnu_size = NULL_TREE;
1254 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1255 | TYPE_QUAL_CONST));
1257 /* Convert the expression to the type of the object except in the
1258 case where the object's type is unconstrained or the object's type
1259 is a padded record whose field is of self-referential size. In
1260 the former case, converting will generate unnecessary evaluations
1261 of the CONSTRUCTOR to compute the size and in the latter case, we
1262 want to only copy the actual data. */
1264 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1265 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1266 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1267 && TYPE_IS_PADDING_P (gnu_type)
1268 && (CONTAINS_PLACEHOLDER_P
1269 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1270 gnu_expr = convert (gnu_type, gnu_expr);
1272 /* If this name is external or there was a name specified, use it,
1273 unless this is a VMS exception object since this would conflict
1274 with the symbol we need to export in addition. Don't use the
1275 Interface_Name if there is an address clause (see CD30005). */
1276 if (!Is_VMS_Exception (gnat_entity)
1277 && ((Present (Interface_Name (gnat_entity))
1278 && No (Address_Clause (gnat_entity)))
1279 || (Is_Public (gnat_entity)
1280 && (!Is_Imported (gnat_entity)
1281 || Is_Exported (gnat_entity)))))
1282 gnu_ext_name = create_concat_name (gnat_entity, NULL);
1284 /* If this is constant initialized to a static constant and the
1285 object has an aggregate type, force it to be statically
1286 allocated. This will avoid an initialization copy. */
1287 if (!static_p && const_flag
1288 && gnu_expr && TREE_CONSTANT (gnu_expr)
1289 && AGGREGATE_TYPE_P (gnu_type)
1290 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1291 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1292 && TYPE_IS_PADDING_P (gnu_type)
1293 && !host_integerp (TYPE_SIZE_UNIT
1294 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1297 gnu_decl = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1298 gnu_expr, const_flag,
1299 Is_Public (gnat_entity),
1300 imported_p || !definition,
1301 static_p, attr_list, gnat_entity);
1302 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1303 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1304 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1306 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1307 if (global_bindings_p ())
1309 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1310 record_global_renaming_pointer (gnu_decl);
1314 if (definition && DECL_SIZE_UNIT (gnu_decl)
1315 && get_block_jmpbuf_decl ()
1316 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1317 || (flag_stack_check == GENERIC_STACK_CHECK
1318 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1319 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1320 add_stmt_with_node (build_call_1_expr
1321 (update_setjmp_buf_decl,
1322 build_unary_op (ADDR_EXPR, NULL_TREE,
1323 get_block_jmpbuf_decl ())),
1326 /* If we are defining an Out parameter and we're not optimizing,
1327 create a fake PARM_DECL for debugging purposes and make it
1328 point to the VAR_DECL. Suppress debug info for the latter
1329 but make sure it will still live on the stack so it can be
1330 accessed from within the debugger through the PARM_DECL. */
1331 if (kind == E_Out_Parameter && definition && !optimize)
1333 tree param = create_param_decl (gnu_entity_name, gnu_type, false);
1334 gnat_pushdecl (param, gnat_entity);
1335 SET_DECL_VALUE_EXPR (param, gnu_decl);
1336 DECL_HAS_VALUE_EXPR_P (param) = 1;
1338 debug_info_p = false;
1340 DECL_IGNORED_P (param) = 1;
1341 TREE_ADDRESSABLE (gnu_decl) = 1;
1344 /* If this is a public constant or we're not optimizing and we're not
1345 making a VAR_DECL for it, make one just for export or debugger use.
1346 Likewise if the address is taken or if either the object or type is
1347 aliased. Make an external declaration for a reference, unless this
1348 is a Standard entity since there no real symbol at the object level
1350 if (TREE_CODE (gnu_decl) == CONST_DECL
1351 && (definition || Sloc (gnat_entity) > Standard_Location)
1352 && ((Is_Public (gnat_entity) && No (Address_Clause (gnat_entity)))
1354 || Address_Taken (gnat_entity)
1355 || Is_Aliased (gnat_entity)
1356 || Is_Aliased (Etype (gnat_entity))))
1359 = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1360 gnu_expr, true, Is_Public (gnat_entity),
1361 !definition, static_p, NULL,
1364 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1366 /* As debugging information will be generated for the variable,
1367 do not generate information for the constant. */
1368 DECL_IGNORED_P (gnu_decl) = 1;
1371 /* If this is declared in a block that contains a block with an
1372 exception handler, we must force this variable in memory to
1373 suppress an invalid optimization. */
1374 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1375 && Exception_Mechanism != Back_End_Exceptions)
1376 TREE_ADDRESSABLE (gnu_decl) = 1;
1378 gnu_type = TREE_TYPE (gnu_decl);
1380 /* Back-annotate Alignment and Esize of the object if not already
1381 known, except for when the object is actually a pointer to the
1382 real object, since alignment and size of a pointer don't have
1383 anything to do with those of the designated object. Note that
1384 we pick the values of the type, not those of the object, to
1385 shield ourselves from low-level platform-dependent adjustments
1386 like alignment promotion. This is both consistent with all the
1387 treatment above, where alignment and size are set on the type of
1388 the object and not on the object directly, and makes it possible
1389 to support confirming representation clauses in all cases. */
1391 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1392 Set_Alignment (gnat_entity,
1393 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
1395 if (!used_by_ref && Unknown_Esize (gnat_entity))
1397 if (TREE_CODE (gnu_type) == RECORD_TYPE
1398 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
1400 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
1402 Set_Esize (gnat_entity, annotate_value (gnu_object_size));
1408 /* Return a TYPE_DECL for "void" that we previously made. */
1409 gnu_decl = TYPE_NAME (void_type_node);
1412 case E_Enumeration_Type:
1413 /* A special case: for the types Character and Wide_Character in
1414 Standard, we do not list all the literals. So if the literals
1415 are not specified, make this an unsigned type. */
1416 if (No (First_Literal (gnat_entity)))
1418 gnu_type = make_unsigned_type (esize);
1419 TYPE_NAME (gnu_type) = gnu_entity_name;
1421 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1422 This is needed by the DWARF-2 back-end to distinguish between
1423 unsigned integer types and character types. */
1424 TYPE_STRING_FLAG (gnu_type) = 1;
1428 /* Normal case of non-character type or non-Standard character type. */
1430 /* Here we have a list of enumeral constants in First_Literal.
1431 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1432 the list to be placed into TYPE_FIELDS. Each node in the list
1433 is a TREE_LIST whose TREE_VALUE is the literal name and whose
1434 TREE_PURPOSE is the value of the literal. */
1436 Entity_Id gnat_literal;
1437 tree gnu_literal_list = NULL_TREE;
1439 if (Is_Unsigned_Type (gnat_entity))
1440 gnu_type = make_unsigned_type (esize);
1442 gnu_type = make_signed_type (esize);
1444 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1446 for (gnat_literal = First_Literal (gnat_entity);
1447 Present (gnat_literal);
1448 gnat_literal = Next_Literal (gnat_literal))
1450 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1453 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1454 gnu_type, gnu_value, true, false, false,
1455 false, NULL, gnat_literal);
1457 save_gnu_tree (gnat_literal, gnu_literal, false);
1458 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1459 gnu_value, gnu_literal_list);
1462 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1464 /* Note that the bounds are updated at the end of this function
1465 to avoid an infinite recursion since they refer to the type. */
1469 case E_Signed_Integer_Type:
1470 case E_Ordinary_Fixed_Point_Type:
1471 case E_Decimal_Fixed_Point_Type:
1472 /* For integer types, just make a signed type the appropriate number
1474 gnu_type = make_signed_type (esize);
1477 case E_Modular_Integer_Type:
1479 /* For modular types, make the unsigned type of the proper number
1480 of bits and then set up the modulus, if required. */
1481 tree gnu_modulus, gnu_high = NULL_TREE;
1483 /* Packed array types are supposed to be subtypes only. */
1484 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1486 gnu_type = make_unsigned_type (esize);
1488 /* Get the modulus in this type. If it overflows, assume it is because
1489 it is equal to 2**Esize. Note that there is no overflow checking
1490 done on unsigned type, so we detect the overflow by looking for
1491 a modulus of zero, which is otherwise invalid. */
1492 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1494 if (!integer_zerop (gnu_modulus))
1496 TYPE_MODULAR_P (gnu_type) = 1;
1497 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1498 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1499 convert (gnu_type, integer_one_node));
1502 /* If the upper bound is not maximal, make an extra subtype. */
1504 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1506 tree gnu_subtype = make_unsigned_type (esize);
1507 TYPE_MAX_VALUE (gnu_subtype) = gnu_high;
1508 TREE_TYPE (gnu_subtype) = gnu_type;
1509 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1510 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1511 gnu_type = gnu_subtype;
1516 case E_Signed_Integer_Subtype:
1517 case E_Enumeration_Subtype:
1518 case E_Modular_Integer_Subtype:
1519 case E_Ordinary_Fixed_Point_Subtype:
1520 case E_Decimal_Fixed_Point_Subtype:
1522 /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
1523 not want to call build_range_type since we would like each subtype
1524 node to be distinct. ??? Historically this was in preparation for
1525 when memory aliasing is implemented, but that's obsolete now given
1526 the call to relate_alias_sets below.
1528 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1529 this fact is used by the arithmetic conversion functions.
1531 We elaborate the Ancestor_Subtype if it is not in the current unit
1532 and one of our bounds is non-static. We do this to ensure consistent
1533 naming in the case where several subtypes share the same bounds, by
1534 elaborating the first such subtype first, thus using its name. */
1537 && Present (Ancestor_Subtype (gnat_entity))
1538 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1539 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1540 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1541 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1543 gnu_type = make_node (INTEGER_TYPE);
1544 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1546 /* This should be an unsigned type if the base type is unsigned or
1547 if the lower bound is constant and non-negative or if the type
1549 TYPE_UNSIGNED (gnu_type) = (Is_Unsigned_Type (Etype (gnat_entity))
1550 || Is_Unsigned_Type (gnat_entity)
1551 || Has_Biased_Representation (gnat_entity));
1553 /* Set the precision to the Esize except for bit-packed arrays and
1554 subtypes of Standard.Boolean. */
1555 if (Is_Packed_Array_Type (gnat_entity)
1556 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1557 esize = UI_To_Int (RM_Size (gnat_entity));
1558 else if (Is_Boolean_Type (gnat_entity))
1561 TYPE_PRECISION (gnu_type) = esize;
1563 TYPE_MIN_VALUE (gnu_type)
1564 = convert (TREE_TYPE (gnu_type),
1565 elaborate_expression (Type_Low_Bound (gnat_entity),
1567 get_identifier ("L"), definition, 1,
1568 Needs_Debug_Info (gnat_entity)));
1570 TYPE_MAX_VALUE (gnu_type)
1571 = convert (TREE_TYPE (gnu_type),
1572 elaborate_expression (Type_High_Bound (gnat_entity),
1574 get_identifier ("U"), definition, 1,
1575 Needs_Debug_Info (gnat_entity)));
1577 /* One of the above calls might have caused us to be elaborated,
1578 so don't blow up if so. */
1579 if (present_gnu_tree (gnat_entity))
1581 maybe_present = true;
1585 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1586 = Has_Biased_Representation (gnat_entity);
1588 layout_type (gnu_type);
1590 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
1591 TYPE_STUB_DECL (gnu_type)
1592 = create_type_stub_decl (gnu_entity_name, gnu_type);
1594 /* Inherit our alias set from what we're a subtype of. Subtypes
1595 are not different types and a pointer can designate any instance
1596 within a subtype hierarchy. */
1597 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1599 /* For a packed array, make the original array type a parallel type. */
1601 && Is_Packed_Array_Type (gnat_entity)
1602 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1603 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1605 (Original_Array_Type (gnat_entity)));
1607 /* If the type we are dealing with represents a bit-packed array,
1608 we need to have the bits left justified on big-endian targets
1609 and right justified on little-endian targets. We also need to
1610 ensure that when the value is read (e.g. for comparison of two
1611 such values), we only get the good bits, since the unused bits
1612 are uninitialized. Both goals are accomplished by wrapping up
1613 the modular type in an enclosing record type. */
1614 if (Is_Packed_Array_Type (gnat_entity)
1615 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1617 tree gnu_field_type, gnu_field;
1619 /* Set the RM size before wrapping up the type. */
1620 TYPE_RM_SIZE (gnu_type)
1621 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1622 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1623 gnu_field_type = gnu_type;
1625 gnu_type = make_node (RECORD_TYPE);
1626 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1628 /* Propagate the alignment of the modular type to the record.
1629 This means that bit-packed arrays have "ceil" alignment for
1630 their size, which may seem counter-intuitive but makes it
1631 possible to easily overlay them on modular types. */
1632 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1633 TYPE_PACKED (gnu_type) = 1;
1635 /* Create a stripped-down declaration of the original type, mainly
1637 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1638 debug_info_p, gnat_entity);
1640 /* Don't notify the field as "addressable", since we won't be taking
1641 it's address and it would prevent create_field_decl from making a
1643 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1644 gnu_field_type, gnu_type, 1, 0, 0, 0);
1646 /* Do not finalize it until after the parallel type is added. */
1647 finish_record_type (gnu_type, gnu_field, 0, true);
1648 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1650 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1652 /* Make the original array type a parallel type. */
1654 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1655 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1657 (Original_Array_Type (gnat_entity)));
1659 rest_of_record_type_compilation (gnu_type);
1662 /* If the type we are dealing with has got a smaller alignment than the
1663 natural one, we need to wrap it up in a record type and under-align
1664 the latter. We reuse the padding machinery for this purpose. */
1665 else if (Present (Alignment_Clause (gnat_entity))
1666 && UI_Is_In_Int_Range (Alignment (gnat_entity))
1667 && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
1668 && align < TYPE_ALIGN (gnu_type))
1670 tree gnu_field_type, gnu_field;
1672 /* Set the RM size before wrapping up the type. */
1673 TYPE_RM_SIZE (gnu_type)
1674 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1675 gnu_field_type = gnu_type;
1677 gnu_type = make_node (RECORD_TYPE);
1678 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1680 TYPE_ALIGN (gnu_type) = align;
1681 TYPE_PACKED (gnu_type) = 1;
1683 /* Create a stripped-down declaration of the original type, mainly
1685 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1686 debug_info_p, gnat_entity);
1688 /* Don't notify the field as "addressable", since we won't be taking
1689 it's address and it would prevent create_field_decl from making a
1691 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1692 gnu_field_type, gnu_type, 1, 0, 0, 0);
1694 finish_record_type (gnu_type, gnu_field, 0, false);
1695 TYPE_IS_PADDING_P (gnu_type) = 1;
1697 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1700 /* Otherwise reset the alignment lest we computed it above. */
1706 case E_Floating_Point_Type:
1707 /* If this is a VAX floating-point type, use an integer of the proper
1708 size. All the operations will be handled with ASM statements. */
1709 if (Vax_Float (gnat_entity))
1711 gnu_type = make_signed_type (esize);
1712 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1713 SET_TYPE_DIGITS_VALUE (gnu_type,
1714 UI_To_gnu (Digits_Value (gnat_entity),
1719 /* The type of the Low and High bounds can be our type if this is
1720 a type from Standard, so set them at the end of the function. */
1721 gnu_type = make_node (REAL_TYPE);
1722 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1723 layout_type (gnu_type);
1726 case E_Floating_Point_Subtype:
1727 if (Vax_Float (gnat_entity))
1729 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1735 && Present (Ancestor_Subtype (gnat_entity))
1736 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1737 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1738 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1739 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1742 gnu_type = make_node (REAL_TYPE);
1743 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1744 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1746 TYPE_MIN_VALUE (gnu_type)
1747 = convert (TREE_TYPE (gnu_type),
1748 elaborate_expression (Type_Low_Bound (gnat_entity),
1749 gnat_entity, get_identifier ("L"),
1751 Needs_Debug_Info (gnat_entity)));
1753 TYPE_MAX_VALUE (gnu_type)
1754 = convert (TREE_TYPE (gnu_type),
1755 elaborate_expression (Type_High_Bound (gnat_entity),
1756 gnat_entity, get_identifier ("U"),
1758 Needs_Debug_Info (gnat_entity)));
1760 /* One of the above calls might have caused us to be elaborated,
1761 so don't blow up if so. */
1762 if (present_gnu_tree (gnat_entity))
1764 maybe_present = true;
1768 layout_type (gnu_type);
1770 /* Inherit our alias set from what we're a subtype of, as for
1771 integer subtypes. */
1772 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1776 /* Array and String Types and Subtypes
1778 Unconstrained array types are represented by E_Array_Type and
1779 constrained array types are represented by E_Array_Subtype. There
1780 are no actual objects of an unconstrained array type; all we have
1781 are pointers to that type.
1783 The following fields are defined on array types and subtypes:
1785 Component_Type Component type of the array.
1786 Number_Dimensions Number of dimensions (an int).
1787 First_Index Type of first index. */
1792 Entity_Id gnat_ind_subtype;
1793 Entity_Id gnat_ind_base_subtype;
1794 int ndim = Number_Dimensions (gnat_entity);
1796 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1798 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1800 tree gnu_template_fields = NULL_TREE;
1801 tree gnu_template_type = make_node (RECORD_TYPE);
1802 tree gnu_template_reference;
1803 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1804 tree gnu_fat_type = make_node (RECORD_TYPE);
1805 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
1806 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree));
1807 tree gnu_max_size = size_one_node, gnu_max_size_unit;
1808 tree gnu_comp_size, tem;
1810 TYPE_NAME (gnu_template_type)
1811 = create_concat_name (gnat_entity, "XUB");
1813 /* Make a node for the array. If we are not defining the array
1814 suppress expanding incomplete types. */
1815 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1818 defer_incomplete_level++, this_deferred = true;
1820 /* Build the fat pointer type. Use a "void *" object instead of
1821 a pointer to the array type since we don't have the array type
1822 yet (it will reference the fat pointer via the bounds). */
1823 tem = chainon (chainon (NULL_TREE,
1824 create_field_decl (get_identifier ("P_ARRAY"),
1826 gnu_fat_type, 0, 0, 0, 0)),
1827 create_field_decl (get_identifier ("P_BOUNDS"),
1829 gnu_fat_type, 0, 0, 0, 0));
1831 /* Make sure we can put this into a register. */
1832 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1834 /* Do not finalize this record type since the types of its fields
1835 are still incomplete at this point. */
1836 finish_record_type (gnu_fat_type, tem, 0, true);
1837 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1839 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1840 is the fat pointer. This will be used to access the individual
1841 fields once we build them. */
1842 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1843 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1844 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1845 gnu_template_reference
1846 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1847 TREE_READONLY (gnu_template_reference) = 1;
1849 /* Now create the GCC type for each index and add the fields for
1850 that index to the template. */
1851 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
1852 gnat_ind_base_subtype
1853 = First_Index (Implementation_Base_Type (gnat_entity));
1854 index < ndim && index >= 0;
1856 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1857 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1859 char field_name[10];
1860 tree gnu_ind_subtype
1861 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1862 tree gnu_base_subtype
1863 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1865 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1867 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1868 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1870 /* Make the FIELD_DECLs for the minimum and maximum of this
1871 type and then make extractions of that field from the
1873 sprintf (field_name, "LB%d", index);
1874 gnu_min_field = create_field_decl (get_identifier (field_name),
1876 gnu_template_type, 0, 0, 0, 0);
1877 field_name[0] = 'U';
1878 gnu_max_field = create_field_decl (get_identifier (field_name),
1880 gnu_template_type, 0, 0, 0, 0);
1882 Sloc_to_locus (Sloc (gnat_entity),
1883 &DECL_SOURCE_LOCATION (gnu_min_field));
1884 Sloc_to_locus (Sloc (gnat_entity),
1885 &DECL_SOURCE_LOCATION (gnu_max_field));
1886 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1888 /* We can't use build_component_ref here since the template
1889 type isn't complete yet. */
1890 gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype,
1891 gnu_template_reference, gnu_min_field,
1893 gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype,
1894 gnu_template_reference, gnu_max_field,
1896 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1898 /* Make a range type with the new ranges, but using
1899 the Ada subtype. Then we convert to sizetype. */
1900 gnu_index_types[index]
1901 = create_index_type (convert (sizetype, gnu_min),
1902 convert (sizetype, gnu_max),
1903 build_range_type (gnu_ind_subtype,
1906 /* Update the maximum size of the array, in elements. */
1908 = size_binop (MULT_EXPR, gnu_max_size,
1909 size_binop (PLUS_EXPR, size_one_node,
1910 size_binop (MINUS_EXPR, gnu_base_max,
1913 TYPE_NAME (gnu_index_types[index])
1914 = create_concat_name (gnat_entity, field_name);
1917 for (index = 0; index < ndim; index++)
1919 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1921 /* Install all the fields into the template. */
1922 finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
1923 TYPE_READONLY (gnu_template_type) = 1;
1925 /* Now make the array of arrays and update the pointer to the array
1926 in the fat pointer. Note that it is the first field. */
1927 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1929 /* Try to get a smaller form of the component if needed. */
1930 if ((Is_Packed (gnat_entity)
1931 || Has_Component_Size_Clause (gnat_entity))
1932 && !Is_Bit_Packed_Array (gnat_entity)
1933 && !Has_Aliased_Components (gnat_entity)
1934 && !Strict_Alignment (Component_Type (gnat_entity))
1935 && TREE_CODE (tem) == RECORD_TYPE
1936 && !TYPE_IS_FAT_POINTER_P (tem)
1937 && host_integerp (TYPE_SIZE (tem), 1))
1938 tem = make_packable_type (tem, false);
1940 if (Has_Atomic_Components (gnat_entity))
1941 check_ok_for_atomic (tem, gnat_entity, true);
1943 /* Get and validate any specified Component_Size, but if Packed,
1944 ignore it since the front end will have taken care of it. */
1946 = validate_size (Component_Size (gnat_entity), tem,
1948 (Is_Bit_Packed_Array (gnat_entity)
1949 ? TYPE_DECL : VAR_DECL),
1950 true, Has_Component_Size_Clause (gnat_entity));
1952 /* If the component type is a RECORD_TYPE that has a self-referential
1953 size, use the maximum size. */
1955 && TREE_CODE (tem) == RECORD_TYPE
1956 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1957 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1959 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
1961 tree orig_tem = tem;
1962 unsigned int max_align;
1964 /* If an alignment is specified, use it as a cap on the component
1965 type so that it can be honored for the whole type. But ignore
1966 it for the original type of packed array types. */
1967 if (No (Packed_Array_Type (gnat_entity))
1968 && Known_Alignment (gnat_entity))
1969 max_align = validate_alignment (Alignment (gnat_entity),
1974 tem = make_type_from_size (tem, gnu_comp_size, false);
1975 if (max_align > 0 && TYPE_ALIGN (tem) > max_align)
1980 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1981 "C_PAD", false, definition, true);
1983 /* If a padding record was made, declare it now since it will
1984 never be declared otherwise. This is necessary to ensure
1985 that its subtrees are properly marked. */
1986 if (tem != orig_tem)
1987 create_type_decl (TYPE_NAME (tem), tem, NULL, true,
1988 debug_info_p, gnat_entity);
1991 if (Has_Volatile_Components (gnat_entity))
1992 tem = build_qualified_type (tem,
1993 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1995 /* If Component_Size is not already specified, annotate it with the
1996 size of the component. */
1997 if (Unknown_Component_Size (gnat_entity))
1998 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
2000 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
2001 size_binop (MULT_EXPR, gnu_max_size,
2002 TYPE_SIZE_UNIT (tem)));
2003 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
2004 size_binop (MULT_EXPR,
2005 convert (bitsizetype,
2009 for (index = ndim - 1; index >= 0; index--)
2011 tem = build_array_type (tem, gnu_index_types[index]);
2012 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
2013 if (array_type_has_nonaliased_component (gnat_entity, tem))
2014 TYPE_NONALIASED_COMPONENT (tem) = 1;
2017 /* If an alignment is specified, use it if valid. But ignore it
2018 for the original type of packed array types. If the alignment
2019 was requested with an explicit alignment clause, state so. */
2020 if (No (Packed_Array_Type (gnat_entity))
2021 && Known_Alignment (gnat_entity))
2024 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2026 if (Present (Alignment_Clause (gnat_entity)))
2027 TYPE_USER_ALIGN (tem) = 1;
2030 TYPE_CONVENTION_FORTRAN_P (tem)
2031 = (Convention (gnat_entity) == Convention_Fortran);
2032 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2034 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2035 corresponding fat pointer. */
2036 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2037 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2038 SET_TYPE_MODE (gnu_type, BLKmode);
2039 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2040 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2042 /* If the maximum size doesn't overflow, use it. */
2043 if (TREE_CODE (gnu_max_size) == INTEGER_CST
2044 && !TREE_OVERFLOW (gnu_max_size))
2046 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
2047 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2048 && !TREE_OVERFLOW (gnu_max_size_unit))
2049 TYPE_SIZE_UNIT (tem)
2050 = size_binop (MIN_EXPR, gnu_max_size_unit,
2051 TYPE_SIZE_UNIT (tem));
2053 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2054 tem, NULL, !Comes_From_Source (gnat_entity),
2055 debug_info_p, gnat_entity);
2057 /* Give the fat pointer type a name. */
2058 create_type_decl (create_concat_name (gnat_entity, "XUP"),
2059 gnu_fat_type, NULL, true,
2060 debug_info_p, gnat_entity);
2062 /* Create the type to be used as what a thin pointer designates: an
2063 record type for the object and its template with the field offsets
2064 shifted to have the template at a negative offset. */
2065 tem = build_unc_object_type (gnu_template_type, tem,
2066 create_concat_name (gnat_entity, "XUT"));
2067 shift_unc_components_for_thin_pointers (tem);
2069 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2070 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2072 /* Give the thin pointer type a name. */
2073 create_type_decl (create_concat_name (gnat_entity, "XUX"),
2074 build_pointer_type (tem), NULL, true,
2075 debug_info_p, gnat_entity);
2079 case E_String_Subtype:
2080 case E_Array_Subtype:
2082 /* This is the actual data type for array variables. Multidimensional
2083 arrays are implemented in the gnu tree as arrays of arrays. Note
2084 that for the moment arrays which have sparse enumeration subtypes as
2085 index components create sparse arrays, which is obviously space
2086 inefficient but so much easier to code for now.
2088 Also note that the subtype never refers to the unconstrained
2089 array type, which is somewhat at variance with Ada semantics.
2091 First check to see if this is simply a renaming of the array
2092 type. If so, the result is the array type. */
2094 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2095 if (!Is_Constrained (gnat_entity))
2099 Entity_Id gnat_ind_subtype;
2100 Entity_Id gnat_ind_base_subtype;
2101 int dim = Number_Dimensions (gnat_entity);
2103 = (Convention (gnat_entity) == Convention_Fortran) ? dim - 1 : 0;
2105 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
2107 tree gnu_base_type = gnu_type;
2108 tree *gnu_index_type = (tree *) alloca (dim * sizeof (tree));
2109 tree gnu_max_size = size_one_node, gnu_max_size_unit;
2110 bool need_index_type_struct = false;
2111 bool max_overflow = false;
2113 /* First create the gnu types for each index. Create types for
2114 debugging information to point to the index types if the
2115 are not integer types, have variable bounds, or are
2116 wider than sizetype. */
2118 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
2119 gnat_ind_base_subtype
2120 = First_Index (Implementation_Base_Type (gnat_entity));
2121 index < dim && index >= 0;
2123 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
2124 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
2126 tree gnu_index_subtype
2127 = get_unpadded_type (Etype (gnat_ind_subtype));
2129 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
2131 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
2132 tree gnu_base_subtype
2133 = get_unpadded_type (Etype (gnat_ind_base_subtype));
2135 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
2137 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
2138 tree gnu_base_type = get_base_type (gnu_base_subtype);
2139 tree gnu_base_base_min
2140 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
2141 tree gnu_base_base_max
2142 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
2146 /* If the minimum and maximum values both overflow in
2147 SIZETYPE, but the difference in the original type
2148 does not overflow in SIZETYPE, ignore the overflow
2150 if ((TYPE_PRECISION (gnu_index_subtype)
2151 > TYPE_PRECISION (sizetype)
2152 || TYPE_UNSIGNED (gnu_index_subtype)
2153 != TYPE_UNSIGNED (sizetype))
2154 && TREE_CODE (gnu_min) == INTEGER_CST
2155 && TREE_CODE (gnu_max) == INTEGER_CST
2156 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2158 (fold_build2 (MINUS_EXPR, gnu_index_subtype,
2159 TYPE_MAX_VALUE (gnu_index_subtype),
2160 TYPE_MIN_VALUE (gnu_index_subtype))))
2162 TREE_OVERFLOW (gnu_min) = 0;
2163 TREE_OVERFLOW (gnu_max) = 0;
2164 if (tree_int_cst_lt (gnu_max, gnu_min))
2166 gnu_min = size_one_node;
2167 gnu_max = size_zero_node;
2172 /* Similarly, if the range is null, use bounds of 1..0 for
2173 the sizetype bounds. */
2174 else if ((TYPE_PRECISION (gnu_index_subtype)
2175 > TYPE_PRECISION (sizetype)
2176 || TYPE_UNSIGNED (gnu_index_subtype)
2177 != TYPE_UNSIGNED (sizetype))
2178 && TREE_CODE (gnu_min) == INTEGER_CST
2179 && TREE_CODE (gnu_max) == INTEGER_CST
2180 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2181 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
2182 TYPE_MIN_VALUE (gnu_index_subtype)))
2184 gnu_min = size_one_node;
2185 gnu_max = size_zero_node;
2189 /* See if the base array type is already flat. If it is, we
2190 are probably compiling an ACATS test, but it will cause the
2191 code below to malfunction if we don't handle it specially. */
2192 else if (TREE_CODE (gnu_base_min) == INTEGER_CST
2193 && TREE_CODE (gnu_base_max) == INTEGER_CST
2194 && !TREE_OVERFLOW (gnu_base_min)
2195 && !TREE_OVERFLOW (gnu_base_max)
2196 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
2198 gnu_min = size_one_node;
2199 gnu_max = size_zero_node;
2205 /* Now compute the size of this bound. We need to provide
2206 GCC with an upper bound to use but have to deal with the
2207 "superflat" case. There are three ways to do this. If
2208 we can prove that the array can never be superflat, we
2209 can just use the high bound of the index subtype. If we
2210 can prove that the low bound minus one can't overflow,
2211 we can do this as MAX (hb, lb - 1). Otherwise, we have
2212 to use the expression hb >= lb ? hb : lb - 1. */
2213 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2215 /* If gnu_high is now an integer which overflowed, the array
2216 cannot be superflat. */
2217 if (TREE_CODE (gnu_high) == INTEGER_CST
2218 && TREE_OVERFLOW (gnu_high))
2221 /* gnu_high cannot overflow if the subtype is unsigned since
2222 sizetype is signed, or if it is now a constant that hasn't
2224 else if (TYPE_UNSIGNED (gnu_base_subtype)
2225 || TREE_CODE (gnu_high) == INTEGER_CST)
2226 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2230 = build_cond_expr (sizetype,
2231 build_binary_op (GE_EXPR,
2237 gnu_index_type[index]
2238 = create_index_type (gnu_min, gnu_high, gnu_index_subtype,
2241 /* Also compute the maximum size of the array. Here we
2242 see if any constraint on the index type of the base type
2243 can be used in the case of self-referential bound on
2244 the index type of the subtype. We look for a non-"infinite"
2245 and non-self-referential bound from any type involved and
2246 handle each bound separately. */
2248 if ((TREE_CODE (gnu_min) == INTEGER_CST
2249 && !TREE_OVERFLOW (gnu_min)
2250 && !operand_equal_p (gnu_min, gnu_base_base_min, 0))
2251 || !CONTAINS_PLACEHOLDER_P (gnu_min)
2252 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2253 && !TREE_OVERFLOW (gnu_base_min)))
2254 gnu_base_min = gnu_min;
2256 if ((TREE_CODE (gnu_max) == INTEGER_CST
2257 && !TREE_OVERFLOW (gnu_max)
2258 && !operand_equal_p (gnu_max, gnu_base_base_max, 0))
2259 || !CONTAINS_PLACEHOLDER_P (gnu_max)
2260 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2261 && !TREE_OVERFLOW (gnu_base_max)))
2262 gnu_base_max = gnu_max;
2264 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2265 && TREE_OVERFLOW (gnu_base_min))
2266 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2267 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2268 && TREE_OVERFLOW (gnu_base_max))
2269 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2270 max_overflow = true;
2272 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
2273 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
2276 = size_binop (MAX_EXPR,
2277 size_binop (PLUS_EXPR, size_one_node,
2278 size_binop (MINUS_EXPR, gnu_base_max,
2282 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2283 && TREE_OVERFLOW (gnu_this_max))
2284 max_overflow = true;
2287 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2289 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
2290 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
2292 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
2293 || (TREE_TYPE (gnu_index_subtype)
2294 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
2296 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
2297 || (TYPE_PRECISION (gnu_index_subtype)
2298 > TYPE_PRECISION (sizetype)))
2299 need_index_type_struct = true;
2302 /* Then flatten: create the array of arrays. For an array type
2303 used to implement a packed array, get the component type from
2304 the original array type since the representation clauses that
2305 can affect it are on the latter. */
2306 if (Is_Packed_Array_Type (gnat_entity)
2307 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2309 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2310 for (index = dim - 1; index >= 0; index--)
2311 gnu_type = TREE_TYPE (gnu_type);
2313 /* One of the above calls might have caused us to be elaborated,
2314 so don't blow up if so. */
2315 if (present_gnu_tree (gnat_entity))
2317 maybe_present = true;
2325 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
2327 /* One of the above calls might have caused us to be elaborated,
2328 so don't blow up if so. */
2329 if (present_gnu_tree (gnat_entity))
2331 maybe_present = true;
2335 /* Try to get a smaller form of the component if needed. */
2336 if ((Is_Packed (gnat_entity)
2337 || Has_Component_Size_Clause (gnat_entity))
2338 && !Is_Bit_Packed_Array (gnat_entity)
2339 && !Has_Aliased_Components (gnat_entity)
2340 && !Strict_Alignment (Component_Type (gnat_entity))
2341 && TREE_CODE (gnu_type) == RECORD_TYPE
2342 && !TYPE_IS_FAT_POINTER_P (gnu_type)
2343 && host_integerp (TYPE_SIZE (gnu_type), 1))
2344 gnu_type = make_packable_type (gnu_type, false);
2346 /* Get and validate any specified Component_Size, but if Packed,
2347 ignore it since the front end will have taken care of it. */
2349 = validate_size (Component_Size (gnat_entity), gnu_type,
2351 (Is_Bit_Packed_Array (gnat_entity)
2352 ? TYPE_DECL : VAR_DECL), true,
2353 Has_Component_Size_Clause (gnat_entity));
2355 /* If the component type is a RECORD_TYPE that has a
2356 self-referential size, use the maximum size. */
2358 && TREE_CODE (gnu_type) == RECORD_TYPE
2359 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2360 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
2362 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
2364 tree orig_gnu_type = gnu_type;
2365 unsigned int max_align;
2367 /* If an alignment is specified, use it as a cap on the
2368 component type so that it can be honored for the whole
2369 type. But ignore it for the original type of packed
2371 if (No (Packed_Array_Type (gnat_entity))
2372 && Known_Alignment (gnat_entity))
2373 max_align = validate_alignment (Alignment (gnat_entity),
2379 = make_type_from_size (gnu_type, gnu_comp_size, false);
2380 if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
2381 gnu_type = orig_gnu_type;
2383 orig_gnu_type = gnu_type;
2385 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
2386 gnat_entity, "C_PAD", false,
2389 /* If a padding record was made, declare it now since it
2390 will never be declared otherwise. This is necessary
2391 to ensure that its subtrees are properly marked. */
2392 if (gnu_type != orig_gnu_type)
2393 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL,
2394 true, debug_info_p, gnat_entity);
2397 if (Has_Volatile_Components (Base_Type (gnat_entity)))
2398 gnu_type = build_qualified_type (gnu_type,
2399 (TYPE_QUALS (gnu_type)
2400 | TYPE_QUAL_VOLATILE));
2403 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2404 TYPE_SIZE_UNIT (gnu_type));
2405 gnu_max_size = size_binop (MULT_EXPR,
2406 convert (bitsizetype, gnu_max_size),
2407 TYPE_SIZE (gnu_type));
2409 for (index = dim - 1; index >= 0; index --)
2411 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
2412 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2413 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2414 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2417 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2418 TYPE_STUB_DECL (gnu_type)
2419 = create_type_stub_decl (gnu_entity_name, gnu_type);
2421 /* If we are at file level and this is a multi-dimensional array, we
2422 need to make a variable corresponding to the stride of the
2423 inner dimensions. */
2424 if (global_bindings_p () && dim > 1)
2426 tree gnu_str_name = get_identifier ("ST");
2429 for (gnu_arr_type = TREE_TYPE (gnu_type);
2430 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2431 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2432 gnu_str_name = concat_name (gnu_str_name, "ST"))
2434 tree eltype = TREE_TYPE (gnu_arr_type);
2436 TYPE_SIZE (gnu_arr_type)
2437 = elaborate_expression_1 (gnat_entity, gnat_entity,
2438 TYPE_SIZE (gnu_arr_type),
2439 gnu_str_name, definition, 0);
2441 /* ??? For now, store the size as a multiple of the
2442 alignment of the element type in bytes so that we
2443 can see the alignment from the tree. */
2444 TYPE_SIZE_UNIT (gnu_arr_type)
2446 (MULT_EXPR, sizetype,
2447 elaborate_expression_1
2448 (gnat_entity, gnat_entity,
2449 build_binary_op (EXACT_DIV_EXPR, sizetype,
2450 TYPE_SIZE_UNIT (gnu_arr_type),
2451 size_int (TYPE_ALIGN (eltype)
2453 concat_name (gnu_str_name, "A_U"), definition, 0),
2454 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2456 /* ??? create_type_decl is not invoked on the inner types so
2457 the MULT_EXPR node built above will never be marked. */
2458 mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type));
2462 /* If we need to write out a record type giving the names of the
2463 bounds for debugging purposes, do it now and make the record
2464 type a parallel type. This is not needed for a packed array
2465 since the bounds are conveyed by the original array type. */
2466 if (need_index_type_struct
2468 && !Is_Packed_Array_Type (gnat_entity))
2470 tree gnu_bound_rec = make_node (RECORD_TYPE);
2471 tree gnu_field_list = NULL_TREE;
2474 TYPE_NAME (gnu_bound_rec)
2475 = create_concat_name (gnat_entity, "XA");
2477 for (index = dim - 1; index >= 0; index--)
2479 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_type[index]);
2480 tree gnu_index_name = TYPE_NAME (gnu_index);
2482 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2483 gnu_index_name = DECL_NAME (gnu_index_name);
2485 /* Make sure to reference the types themselves, and not just
2486 their names, as the debugger may fall back on them. */
2487 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2489 0, NULL_TREE, NULL_TREE, 0);
2490 TREE_CHAIN (gnu_field) = gnu_field_list;
2491 gnu_field_list = gnu_field;
2494 finish_record_type (gnu_bound_rec, gnu_field_list, 0, false);
2495 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2498 /* Otherwise, for a packed array, make the original array type a
2500 else if (debug_info_p
2501 && Is_Packed_Array_Type (gnat_entity)
2502 && present_gnu_tree (Original_Array_Type (gnat_entity)))
2503 add_parallel_type (TYPE_STUB_DECL (gnu_type),
2505 (Original_Array_Type (gnat_entity)));
2507 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2508 = (Convention (gnat_entity) == Convention_Fortran);
2509 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2510 = (Is_Packed_Array_Type (gnat_entity)
2511 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2513 /* If our size depends on a placeholder and the maximum size doesn't
2514 overflow, use it. */
2515 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2516 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2517 && TREE_OVERFLOW (gnu_max_size))
2518 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2519 && TREE_OVERFLOW (gnu_max_size_unit))
2522 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2523 TYPE_SIZE (gnu_type));
2524 TYPE_SIZE_UNIT (gnu_type)
2525 = size_binop (MIN_EXPR, gnu_max_size_unit,
2526 TYPE_SIZE_UNIT (gnu_type));
2529 /* Set our alias set to that of our base type. This gives all
2530 array subtypes the same alias set. */
2531 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2534 /* If this is a packed type, make this type the same as the packed
2535 array type, but do some adjusting in the type first. */
2536 if (Present (Packed_Array_Type (gnat_entity)))
2538 Entity_Id gnat_index;
2539 tree gnu_inner_type;
2541 /* First finish the type we had been making so that we output
2542 debugging information for it. */
2544 = build_qualified_type (gnu_type,
2545 (TYPE_QUALS (gnu_type)
2546 | (TYPE_QUAL_VOLATILE
2547 * Treat_As_Volatile (gnat_entity))));
2550 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2551 !Comes_From_Source (gnat_entity),
2552 debug_info_p, gnat_entity);
2554 /* Save it as our equivalent in case the call below elaborates
2556 save_gnu_tree (gnat_entity, gnu_decl, false);
2558 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2560 this_made_decl = true;
2561 gnu_type = TREE_TYPE (gnu_decl);
2562 save_gnu_tree (gnat_entity, NULL_TREE, false);
2564 gnu_inner_type = gnu_type;
2565 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2566 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2567 || TYPE_IS_PADDING_P (gnu_inner_type)))
2568 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2570 /* We need to attach the index type to the type we just made so
2571 that the actual bounds can later be put into a template. */
2572 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2573 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2574 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2575 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2577 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2579 /* The TYPE_ACTUAL_BOUNDS field is overloaded with the
2580 TYPE_MODULUS for modular types so we make an extra
2581 subtype if necessary. */
2582 if (TYPE_MODULAR_P (gnu_inner_type))
2584 tree gnu_subtype = make_node (INTEGER_TYPE);
2585 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2586 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2588 TYPE_UNSIGNED (gnu_subtype) = 1;
2589 TYPE_PRECISION (gnu_subtype)
2590 = TYPE_PRECISION (gnu_inner_type);
2591 TYPE_MIN_VALUE (gnu_subtype)
2592 = TYPE_MIN_VALUE (gnu_inner_type);
2593 TYPE_MAX_VALUE (gnu_subtype)
2594 = TYPE_MAX_VALUE (gnu_inner_type);
2595 layout_type (gnu_subtype);
2597 gnu_inner_type = gnu_subtype;
2600 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2602 #ifdef ENABLE_CHECKING
2603 /* Check for other cases of overloading. */
2604 gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner_type));
2608 /* ??? This is necessary to make sure that the container is
2609 allocated with a null tree upfront; otherwise, it could
2610 be allocated with an uninitialized tree that is accessed
2611 before being set below. See ada-tree.h for details. */
2612 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2614 for (gnat_index = First_Index (gnat_entity);
2615 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2616 SET_TYPE_ACTUAL_BOUNDS
2618 tree_cons (NULL_TREE,
2619 get_unpadded_type (Etype (gnat_index)),
2620 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2622 if (Convention (gnat_entity) != Convention_Fortran)
2623 SET_TYPE_ACTUAL_BOUNDS
2625 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2627 if (TREE_CODE (gnu_type) == RECORD_TYPE
2628 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2629 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2633 /* Abort if packed array with no packed array type field set. */
2635 gcc_assert (!Is_Packed (gnat_entity));
2639 case E_String_Literal_Subtype:
2640 /* Create the type for a string literal. */
2642 Entity_Id gnat_full_type
2643 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2644 && Present (Full_View (Etype (gnat_entity)))
2645 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2646 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2647 tree gnu_string_array_type
2648 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2649 tree gnu_string_index_type
2650 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2651 (TYPE_DOMAIN (gnu_string_array_type))));
2652 tree gnu_lower_bound
2653 = convert (gnu_string_index_type,
2654 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2655 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2656 tree gnu_length = ssize_int (length - 1);
2657 tree gnu_upper_bound
2658 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2660 convert (gnu_string_index_type, gnu_length));
2662 = create_index_type (convert (sizetype, gnu_lower_bound),
2663 convert (sizetype, gnu_upper_bound),
2664 build_range_type (gnu_string_index_type,
2670 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2672 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2673 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2674 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2678 /* Record Types and Subtypes
2680 The following fields are defined on record types:
2682 Has_Discriminants True if the record has discriminants
2683 First_Discriminant Points to head of list of discriminants
2684 First_Entity Points to head of list of fields
2685 Is_Tagged_Type True if the record is tagged
2687 Implementation of Ada records and discriminated records:
2689 A record type definition is transformed into the equivalent of a C
2690 struct definition. The fields that are the discriminants which are
2691 found in the Full_Type_Declaration node and the elements of the
2692 Component_List found in the Record_Type_Definition node. The
2693 Component_List can be a recursive structure since each Variant of
2694 the Variant_Part of the Component_List has a Component_List.
2696 Processing of a record type definition comprises starting the list of
2697 field declarations here from the discriminants and the calling the
2698 function components_to_record to add the rest of the fields from the
2699 component list and return the gnu type node. The function
2700 components_to_record will call itself recursively as it traverses
2704 if (Has_Complex_Representation (gnat_entity))
2707 = build_complex_type
2709 (Etype (Defining_Entity
2710 (First (Component_Items
2713 (Declaration_Node (gnat_entity)))))))));
2719 Node_Id full_definition = Declaration_Node (gnat_entity);
2720 Node_Id record_definition = Type_Definition (full_definition);
2721 Entity_Id gnat_field;
2723 tree gnu_field_list = NULL_TREE;
2724 tree gnu_get_parent;
2725 /* Set PACKED in keeping with gnat_to_gnu_field. */
2727 = Is_Packed (gnat_entity)
2729 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2731 : (Known_Alignment (gnat_entity)
2732 || (Strict_Alignment (gnat_entity)
2733 && Known_Static_Esize (gnat_entity)))
2736 bool has_rep = Has_Specified_Layout (gnat_entity);
2737 bool all_rep = has_rep;
2739 = (Is_Tagged_Type (gnat_entity)
2740 && Nkind (record_definition) == N_Derived_Type_Definition);
2742 /* See if all fields have a rep clause. Stop when we find one
2744 for (gnat_field = First_Entity (gnat_entity);
2745 Present (gnat_field) && all_rep;
2746 gnat_field = Next_Entity (gnat_field))
2747 if ((Ekind (gnat_field) == E_Component
2748 || Ekind (gnat_field) == E_Discriminant)
2749 && No (Component_Clause (gnat_field)))
2752 /* If this is a record extension, go a level further to find the
2753 record definition. Also, verify we have a Parent_Subtype. */
2756 if (!type_annotate_only
2757 || Present (Record_Extension_Part (record_definition)))
2758 record_definition = Record_Extension_Part (record_definition);
2760 gcc_assert (type_annotate_only
2761 || Present (Parent_Subtype (gnat_entity)));
2764 /* Make a node for the record. If we are not defining the record,
2765 suppress expanding incomplete types. */
2766 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2767 TYPE_NAME (gnu_type) = gnu_entity_name;
2768 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2771 defer_incomplete_level++, this_deferred = true;
2773 /* If both a size and rep clause was specified, put the size in
2774 the record type now so that it can get the proper mode. */
2775 if (has_rep && Known_Esize (gnat_entity))
2776 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2778 /* Always set the alignment here so that it can be used to
2779 set the mode, if it is making the alignment stricter. If
2780 it is invalid, it will be checked again below. If this is to
2781 be Atomic, choose a default alignment of a word unless we know
2782 the size and it's smaller. */
2783 if (Known_Alignment (gnat_entity))
2784 TYPE_ALIGN (gnu_type)
2785 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2786 else if (Is_Atomic (gnat_entity))
2787 TYPE_ALIGN (gnu_type)
2788 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2789 /* If a type needs strict alignment, the minimum size will be the
2790 type size instead of the RM size (see validate_size). Cap the
2791 alignment, lest it causes this type size to become too large. */
2792 else if (Strict_Alignment (gnat_entity)
2793 && Known_Static_Esize (gnat_entity))
2795 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2796 unsigned int raw_align = raw_size & -raw_size;
2797 if (raw_align < BIGGEST_ALIGNMENT)
2798 TYPE_ALIGN (gnu_type) = raw_align;
2801 TYPE_ALIGN (gnu_type) = 0;
2803 /* If we have a Parent_Subtype, make a field for the parent. If
2804 this record has rep clauses, force the position to zero. */
2805 if (Present (Parent_Subtype (gnat_entity)))
2807 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2810 /* A major complexity here is that the parent subtype will
2811 reference our discriminants in its Discriminant_Constraint
2812 list. But those must reference the parent component of this
2813 record which is of the parent subtype we have not built yet!
2814 To break the circle we first build a dummy COMPONENT_REF which
2815 represents the "get to the parent" operation and initialize
2816 each of those discriminants to a COMPONENT_REF of the above
2817 dummy parent referencing the corresponding discriminant of the
2818 base type of the parent subtype. */
2819 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2820 build0 (PLACEHOLDER_EXPR, gnu_type),
2821 build_decl (FIELD_DECL, NULL_TREE,
2825 if (Has_Discriminants (gnat_entity))
2826 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2827 Present (gnat_field);
2828 gnat_field = Next_Stored_Discriminant (gnat_field))
2829 if (Present (Corresponding_Discriminant (gnat_field)))
2832 build3 (COMPONENT_REF,
2833 get_unpadded_type (Etype (gnat_field)),
2835 gnat_to_gnu_field_decl (Corresponding_Discriminant
2840 /* Then we build the parent subtype. If it has discriminants but
2841 the type itself has unknown discriminants, this means that it
2842 doesn't contain information about how the discriminants are
2843 derived from those of the ancestor type, so it cannot be used
2844 directly. Instead it is built by cloning the parent subtype
2845 of the underlying record view of the type, for which the above
2846 derivation of discriminants has been made explicit. */
2847 if (Has_Discriminants (gnat_parent)
2848 && Has_Unknown_Discriminants (gnat_entity))
2850 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2852 /* If we are defining the type, the underlying record
2853 view must already have been elaborated at this point.
2854 Otherwise do it now as its parent subtype cannot be
2855 technically elaborated on its own. */
2857 gcc_assert (present_gnu_tree (gnat_uview));
2859 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2861 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2863 /* Substitute the "get to the parent" of the type for that
2864 of its underlying record view in the cloned type. */
2865 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2866 Present (gnat_field);
2867 gnat_field = Next_Stored_Discriminant (gnat_field))
2868 if (Present (Corresponding_Discriminant (gnat_field)))
2870 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2872 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2873 gnu_get_parent, gnu_field, NULL_TREE);
2875 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2879 gnu_parent = gnat_to_gnu_type (gnat_parent);
2881 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2882 initially built. The discriminants must reference the fields
2883 of the parent subtype and not those of its base type for the
2884 placeholder machinery to properly work. */
2885 if (Has_Discriminants (gnat_entity))
2886 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2887 Present (gnat_field);
2888 gnat_field = Next_Stored_Discriminant (gnat_field))
2889 if (Present (Corresponding_Discriminant (gnat_field)))
2891 Entity_Id field = Empty;
2892 for (field = First_Stored_Discriminant (gnat_parent);
2894 field = Next_Stored_Discriminant (field))
2895 if (same_discriminant_p (gnat_field, field))
2897 gcc_assert (Present (field));
2898 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2899 = gnat_to_gnu_field_decl (field);
2902 /* The "get to the parent" COMPONENT_REF must be given its
2904 TREE_TYPE (gnu_get_parent) = gnu_parent;
2906 /* ...and reference the _parent field of this record. */
2908 = create_field_decl (get_identifier
2909 (Get_Name_String (Name_uParent)),
2910 gnu_parent, gnu_type, 0,
2911 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2912 has_rep ? bitsize_zero_node : 0, 1);
2913 DECL_INTERNAL_P (gnu_field_list) = 1;
2914 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2917 /* Make the fields for the discriminants and put them into the record
2918 unless it's an Unchecked_Union. */
2919 if (Has_Discriminants (gnat_entity))
2920 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2921 Present (gnat_field);
2922 gnat_field = Next_Stored_Discriminant (gnat_field))
2924 /* If this is a record extension and this discriminant
2925 is the renaming of another discriminant, we've already
2926 handled the discriminant above. */
2927 if (Present (Parent_Subtype (gnat_entity))
2928 && Present (Corresponding_Discriminant (gnat_field)))
2932 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2934 /* Make an expression using a PLACEHOLDER_EXPR from the
2935 FIELD_DECL node just created and link that with the
2936 corresponding GNAT defining identifier. Then add to the
2938 save_gnu_tree (gnat_field,
2939 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2940 build0 (PLACEHOLDER_EXPR,
2941 DECL_CONTEXT (gnu_field)),
2942 gnu_field, NULL_TREE),
2945 if (!Is_Unchecked_Union (gnat_entity))
2947 TREE_CHAIN (gnu_field) = gnu_field_list;
2948 gnu_field_list = gnu_field;
2952 /* Put the discriminants into the record (backwards), so we can
2953 know the appropriate discriminant to use for the names of the
2955 TYPE_FIELDS (gnu_type) = gnu_field_list;
2957 /* Add the listed fields into the record and finish it up. */
2958 components_to_record (gnu_type, Component_List (record_definition),
2959 gnu_field_list, packed, definition, NULL,
2960 false, all_rep, false,
2961 Is_Unchecked_Union (gnat_entity));
2963 /* We used to remove the associations of the discriminants and
2964 _Parent for validity checking, but we may need them if there's
2965 Freeze_Node for a subtype used in this record. */
2966 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2967 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2969 /* If it is a tagged record force the type to BLKmode to insure
2970 that these objects will always be placed in memory. Do the
2971 same thing for limited record types. */
2972 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2973 SET_TYPE_MODE (gnu_type, BLKmode);
2975 /* Fill in locations of fields. */
2976 annotate_rep (gnat_entity, gnu_type);
2978 /* If there are any entities in the chain corresponding to
2979 components that we did not elaborate, ensure we elaborate their
2980 types if they are Itypes. */
2981 for (gnat_temp = First_Entity (gnat_entity);
2982 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2983 if ((Ekind (gnat_temp) == E_Component
2984 || Ekind (gnat_temp) == E_Discriminant)
2985 && Is_Itype (Etype (gnat_temp))
2986 && !present_gnu_tree (gnat_temp))
2987 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2991 case E_Class_Wide_Subtype:
2992 /* If an equivalent type is present, that is what we should use.
2993 Otherwise, fall through to handle this like a record subtype
2994 since it may have constraints. */
2995 if (gnat_equiv_type != gnat_entity)
2997 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2998 maybe_present = true;
3002 /* ... fall through ... */
3004 case E_Record_Subtype:
3006 /* If Cloned_Subtype is Present it means this record subtype has
3007 identical layout to that type or subtype and we should use
3008 that GCC type for this one. The front end guarantees that
3009 the component list is shared. */
3010 if (Present (Cloned_Subtype (gnat_entity)))
3012 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
3014 maybe_present = true;
3017 /* Otherwise, first ensure the base type is elaborated. Then, if we are
3018 changing the type, make a new type with each field having the
3019 type of the field in the new subtype but having the position
3020 computed by transforming every discriminant reference according
3021 to the constraints. We don't see any difference between
3022 private and nonprivate type here since derivations from types should
3023 have been deferred until the completion of the private type. */
3026 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
3031 defer_incomplete_level++, this_deferred = true;
3033 /* Get the base type initially for its alignment and sizes. But
3034 if it is a padded type, we do all the other work with the
3036 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
3038 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
3039 && TYPE_IS_PADDING_P (gnu_base_type))
3040 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3042 gnu_type = gnu_orig_type = gnu_base_type;
3044 if (present_gnu_tree (gnat_entity))
3046 maybe_present = true;
3050 /* When the type has discriminants, and these discriminants
3051 affect the shape of what it built, factor them in.
3053 If we are making a subtype of an Unchecked_Union (must be an
3054 Itype), just return the type.
3056 We can't just use Is_Constrained because private subtypes without
3057 discriminants of full types with discriminants with default
3058 expressions are Is_Constrained but aren't constrained! */
3060 if (IN (Ekind (gnat_base_type), Record_Kind)
3061 && !Is_For_Access_Subtype (gnat_entity)
3062 && !Is_Unchecked_Union (gnat_base_type)
3063 && Is_Constrained (gnat_entity)
3064 && Stored_Constraint (gnat_entity) != No_Elist
3065 && Present (Discriminant_Constraint (gnat_entity)))
3067 Entity_Id gnat_field;
3068 tree gnu_field_list = 0;
3070 = compute_field_positions (gnu_orig_type, NULL_TREE,
3071 size_zero_node, bitsize_zero_node,
3074 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
3078 gnu_type = make_node (RECORD_TYPE);
3079 TYPE_NAME (gnu_type) = gnu_entity_name;
3080 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3082 /* Set the size, alignment and alias set of the new type to
3083 match that of the old one, doing required substitutions.
3084 We do it this early because we need the size of the new
3085 type below to discard old fields if necessary. */
3086 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
3087 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
3088 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
3089 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
3090 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
3092 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3093 for (gnu_temp = gnu_subst_list;
3094 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3095 TYPE_SIZE (gnu_type)
3096 = substitute_in_expr (TYPE_SIZE (gnu_type),
3097 TREE_PURPOSE (gnu_temp),
3098 TREE_VALUE (gnu_temp));
3100 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
3101 for (gnu_temp = gnu_subst_list;
3102 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3103 TYPE_SIZE_UNIT (gnu_type)
3104 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
3105 TREE_PURPOSE (gnu_temp),
3106 TREE_VALUE (gnu_temp));
3108 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
3109 for (gnu_temp = gnu_subst_list;
3110 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3112 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3113 TREE_PURPOSE (gnu_temp),
3114 TREE_VALUE (gnu_temp)));
3116 for (gnat_field = First_Entity (gnat_entity);
3117 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3118 if ((Ekind (gnat_field) == E_Component
3119 || Ekind (gnat_field) == E_Discriminant)
3120 && (Underlying_Type (Scope (Original_Record_Component
3123 && (No (Corresponding_Discriminant (gnat_field))
3124 || !Is_Tagged_Type (gnat_base_type)))
3127 = gnat_to_gnu_field_decl (Original_Record_Component
3130 = TREE_VALUE (purpose_member (gnu_old_field,
3132 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3133 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3135 = gnat_to_gnu_type (Etype (gnat_field));
3136 tree gnu_size = TYPE_SIZE (gnu_field_type);
3137 tree gnu_new_pos = NULL_TREE;
3138 unsigned int offset_align
3139 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
3143 /* If there was a component clause, the field types must be
3144 the same for the type and subtype, so copy the data from
3145 the old field to avoid recomputation here. Also if the
3146 field is justified modular and the optimization in
3147 gnat_to_gnu_field was applied. */
3148 if (Present (Component_Clause
3149 (Original_Record_Component (gnat_field)))
3150 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3151 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3152 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3153 == TREE_TYPE (gnu_old_field)))
3155 gnu_size = DECL_SIZE (gnu_old_field);
3156 gnu_field_type = TREE_TYPE (gnu_old_field);
3159 /* If the old field was packed and of constant size, we
3160 have to get the old size here, as it might differ from
3161 what the Etype conveys and the latter might overlap
3162 onto the following field. Try to arrange the type for
3163 possible better packing along the way. */
3164 else if (DECL_PACKED (gnu_old_field)
3165 && TREE_CODE (DECL_SIZE (gnu_old_field))
3168 gnu_size = DECL_SIZE (gnu_old_field);
3169 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3170 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
3171 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3173 = make_packable_type (gnu_field_type, true);
3176 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3177 for (gnu_temp = gnu_subst_list;
3178 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3179 gnu_pos = substitute_in_expr (gnu_pos,
3180 TREE_PURPOSE (gnu_temp),
3181 TREE_VALUE (gnu_temp));
3183 /* If the position is now a constant, we can set it as the
3184 position of the field when we make it. Otherwise, we need
3185 to deal with it specially below. */
3186 if (TREE_CONSTANT (gnu_pos))
3188 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3190 /* Discard old fields that are outside the new type.
3191 This avoids confusing code scanning it to decide
3192 how to pass it to functions on some platforms. */
3193 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3194 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3195 && !integer_zerop (gnu_size)
3196 && !tree_int_cst_lt (gnu_new_pos,
3197 TYPE_SIZE (gnu_type)))
3203 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3204 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3205 !DECL_NONADDRESSABLE_P (gnu_old_field));
3207 if (!TREE_CONSTANT (gnu_pos))
3209 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3210 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3211 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3212 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3213 DECL_SIZE (gnu_field) = gnu_size;
3214 DECL_SIZE_UNIT (gnu_field)
3215 = convert (sizetype,
3216 size_binop (CEIL_DIV_EXPR, gnu_size,
3217 bitsize_unit_node));
3218 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3221 DECL_INTERNAL_P (gnu_field)
3222 = DECL_INTERNAL_P (gnu_old_field);
3223 SET_DECL_ORIGINAL_FIELD
3224 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3225 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3227 DECL_DISCRIMINANT_NUMBER (gnu_field)
3228 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3229 TREE_THIS_VOLATILE (gnu_field)
3230 = TREE_THIS_VOLATILE (gnu_old_field);
3232 /* To match the layout crafted in components_to_record, if
3233 this is the _Tag field, put it before any discriminants
3234 instead of after them as for all other fields. */
3235 if (Chars (gnat_field) == Name_uTag)
3236 gnu_field_list = chainon (gnu_field_list, gnu_field);
3239 TREE_CHAIN (gnu_field) = gnu_field_list;
3240 gnu_field_list = gnu_field;
3243 save_gnu_tree (gnat_field, gnu_field, false);
3246 /* Now go through the entities again looking for Itypes that
3247 we have not elaborated but should (e.g., Etypes of fields
3248 that have Original_Components). */
3249 for (gnat_field = First_Entity (gnat_entity);
3250 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3251 if ((Ekind (gnat_field) == E_Discriminant
3252 || Ekind (gnat_field) == E_Component)
3253 && !present_gnu_tree (Etype (gnat_field)))
3254 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3256 /* Do not finalize it since we're going to modify it below. */
3257 gnu_field_list = nreverse (gnu_field_list);
3258 finish_record_type (gnu_type, gnu_field_list, 2, true);
3260 /* Finalize size and mode. */
3261 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3262 TYPE_SIZE_UNIT (gnu_type)
3263 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3265 compute_record_mode (gnu_type);
3267 /* Fill in locations of fields. */
3268 annotate_rep (gnat_entity, gnu_type);
3270 /* We've built a new type, make an XVS type to show what this
3271 is a subtype of. Some debuggers require the XVS type to be
3272 output first, so do it in that order. */
3275 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3276 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
3278 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
3279 gnu_orig_name = DECL_NAME (gnu_orig_name);
3281 TYPE_NAME (gnu_subtype_marker)
3282 = create_concat_name (gnat_entity, "XVS");
3283 finish_record_type (gnu_subtype_marker,
3284 create_field_decl (gnu_orig_name,
3291 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3292 gnu_subtype_marker);
3295 /* Now we can finalize it. */
3296 rest_of_record_type_compilation (gnu_type);
3299 /* Otherwise, go down all the components in the new type and
3300 make them equivalent to those in the base type. */
3302 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3303 gnat_temp = Next_Entity (gnat_temp))
3304 if ((Ekind (gnat_temp) == E_Discriminant
3305 && !Is_Unchecked_Union (gnat_base_type))
3306 || Ekind (gnat_temp) == E_Component)
3307 save_gnu_tree (gnat_temp,
3308 gnat_to_gnu_field_decl
3309 (Original_Record_Component (gnat_temp)), false);
3313 case E_Access_Subprogram_Type:
3314 /* Use the special descriptor type for dispatch tables if needed,
3315 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3316 Note that we are only required to do so for static tables in
3317 order to be compatible with the C++ ABI, but Ada 2005 allows
3318 to extend library level tagged types at the local level so
3319 we do it in the non-static case as well. */
3320 if (TARGET_VTABLE_USES_DESCRIPTORS
3321 && Is_Dispatch_Table_Entity (gnat_entity))
3323 gnu_type = fdesc_type_node;
3324 gnu_size = TYPE_SIZE (gnu_type);
3328 /* ... fall through ... */
3330 case E_Anonymous_Access_Subprogram_Type:
3331 /* If we are not defining this entity, and we have incomplete
3332 entities being processed above us, make a dummy type and
3333 fill it in later. */
3334 if (!definition && defer_incomplete_level != 0)
3336 struct incomplete *p
3337 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3340 = build_pointer_type
3341 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3342 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3343 !Comes_From_Source (gnat_entity),
3344 debug_info_p, gnat_entity);
3345 this_made_decl = true;
3346 gnu_type = TREE_TYPE (gnu_decl);
3347 save_gnu_tree (gnat_entity, gnu_decl, false);
3350 p->old_type = TREE_TYPE (gnu_type);
3351 p->full_type = Directly_Designated_Type (gnat_entity);
3352 p->next = defer_incomplete_list;
3353 defer_incomplete_list = p;
3357 /* ... fall through ... */
3359 case E_Allocator_Type:
3361 case E_Access_Attribute_Type:
3362 case E_Anonymous_Access_Type:
3363 case E_General_Access_Type:
3365 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3366 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3367 bool is_from_limited_with
3368 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3369 && From_With_Type (gnat_desig_equiv));
3371 /* Get the "full view" of this entity. If this is an incomplete
3372 entity from a limited with, treat its non-limited view as the full
3373 view. Otherwise, if this is an incomplete or private type, use the
3374 full view. In the former case, we might point to a private type,
3375 in which case, we need its full view. Also, we want to look at the
3376 actual type used for the representation, so this takes a total of
3378 Entity_Id gnat_desig_full_direct_first
3379 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3380 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3381 ? Full_View (gnat_desig_equiv) : Empty));
3382 Entity_Id gnat_desig_full_direct
3383 = ((is_from_limited_with
3384 && Present (gnat_desig_full_direct_first)
3385 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3386 ? Full_View (gnat_desig_full_direct_first)
3387 : gnat_desig_full_direct_first);
3388 Entity_Id gnat_desig_full
3389 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3391 /* This the type actually used to represent the designated type,
3392 either gnat_desig_full or gnat_desig_equiv. */
3393 Entity_Id gnat_desig_rep;
3395 /* True if this is a pointer to an unconstrained array. */
3396 bool is_unconstrained_array;
3398 /* We want to know if we'll be seeing the freeze node for any
3399 incomplete type we may be pointing to. */
3401 = (Present (gnat_desig_full)
3402 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3403 : In_Extended_Main_Code_Unit (gnat_desig_type));
3405 /* True if we make a dummy type here. */
3406 bool got_fat_p = false;
3407 /* True if the dummy is a fat pointer. */
3408 bool made_dummy = false;
3409 tree gnu_desig_type = NULL_TREE;
3410 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3412 if (!targetm.valid_pointer_mode (p_mode))
3415 /* If either the designated type or its full view is an unconstrained
3416 array subtype, replace it with the type it's a subtype of. This
3417 avoids problems with multiple copies of unconstrained array types.
3418 Likewise, if the designated type is a subtype of an incomplete
3419 record type, use the parent type to avoid order of elaboration
3420 issues. This can lose some code efficiency, but there is no
3422 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3423 && ! Is_Constrained (gnat_desig_equiv))
3424 gnat_desig_equiv = Etype (gnat_desig_equiv);
3425 if (Present (gnat_desig_full)
3426 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3427 && ! Is_Constrained (gnat_desig_full))
3428 || (Ekind (gnat_desig_full) == E_Record_Subtype
3429 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3430 gnat_desig_full = Etype (gnat_desig_full);
3432 /* Now set the type that actually marks the representation of
3433 the designated type and also flag whether we have a unconstrained
3435 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3436 is_unconstrained_array
3437 = (Is_Array_Type (gnat_desig_rep)
3438 && ! Is_Constrained (gnat_desig_rep));
3440 /* If we are pointing to an incomplete type whose completion is an
3441 unconstrained array, make a fat pointer type. The two types in our
3442 fields will be pointers to dummy nodes and will be replaced in
3443 update_pointer_to. Similarly, if the type itself is a dummy type or
3444 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3445 in case we have any thin pointers to it. */
3446 if (is_unconstrained_array
3447 && (Present (gnat_desig_full)
3448 || (present_gnu_tree (gnat_desig_equiv)
3449 && TYPE_IS_DUMMY_P (TREE_TYPE
3450 (get_gnu_tree (gnat_desig_equiv))))
3451 || (No (gnat_desig_full) && ! in_main_unit
3452 && defer_incomplete_level != 0
3453 && ! present_gnu_tree (gnat_desig_equiv))
3454 || (in_main_unit && is_from_limited_with
3455 && Present (Freeze_Node (gnat_desig_rep)))))
3459 if (present_gnu_tree (gnat_desig_rep))
3460 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3463 gnu_old = make_dummy_type (gnat_desig_rep);
3465 /* Show the dummy we get will be a fat pointer. */
3466 got_fat_p = made_dummy = true;
3469 /* If the call above got something that has a pointer, that
3470 pointer is our type. This could have happened either
3471 because the type was elaborated or because somebody
3472 else executed the code below. */
3473 gnu_type = TYPE_POINTER_TO (gnu_old);
3476 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3477 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3478 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3479 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3482 TYPE_NAME (gnu_template_type)
3483 = create_concat_name (gnat_desig_equiv, "XUB");
3484 TYPE_DUMMY_P (gnu_template_type) = 1;
3486 TYPE_NAME (gnu_array_type)
3487 = create_concat_name (gnat_desig_equiv, "XUA");
3488 TYPE_DUMMY_P (gnu_array_type) = 1;
3490 gnu_type = make_node (RECORD_TYPE);
3491 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3492 TYPE_POINTER_TO (gnu_old) = gnu_type;
3494 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3496 = chainon (chainon (NULL_TREE,
3498 (get_identifier ("P_ARRAY"),
3500 gnu_type, 0, 0, 0, 0)),
3501 create_field_decl (get_identifier ("P_BOUNDS"),
3503 gnu_type, 0, 0, 0, 0));
3505 /* Make sure we can place this into a register. */
3506 TYPE_ALIGN (gnu_type)
3507 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3508 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3510 /* Do not finalize this record type since the types of
3511 its fields are incomplete. */
3512 finish_record_type (gnu_type, fields, 0, true);
3514 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3515 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3516 = create_concat_name (gnat_desig_equiv, "XUT");
3517 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3521 /* If we already know what the full type is, use it. */
3522 else if (Present (gnat_desig_full)
3523 && present_gnu_tree (gnat_desig_full))
3524 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3526 /* Get the type of the thing we are to point to and build a pointer
3527 to it. If it is a reference to an incomplete or private type with a
3528 full view that is a record, make a dummy type node and get the
3529 actual type later when we have verified it is safe. */
3530 else if ((! in_main_unit
3531 && ! present_gnu_tree (gnat_desig_equiv)
3532 && Present (gnat_desig_full)
3533 && ! present_gnu_tree (gnat_desig_full)
3534 && Is_Record_Type (gnat_desig_full))
3535 /* Likewise if we are pointing to a record or array and we
3536 are to defer elaborating incomplete types. We do this
3537 since this access type may be the full view of some
3538 private type. Note that the unconstrained array case is
3540 || ((! in_main_unit || imported_p)
3541 && defer_incomplete_level != 0
3542 && ! present_gnu_tree (gnat_desig_equiv)
3543 && ((Is_Record_Type (gnat_desig_rep)
3544 || Is_Array_Type (gnat_desig_rep))))
3545 /* If this is a reference from a limited_with type back to our
3546 main unit and there's a Freeze_Node for it, either we have
3547 already processed the declaration and made the dummy type,
3548 in which case we just reuse the latter, or we have not yet,
3549 in which case we make the dummy type and it will be reused
3550 when the declaration is processed. In both cases, the
3551 pointer eventually created below will be automatically
3552 adjusted when the Freeze_Node is processed. Note that the
3553 unconstrained array case is handled above. */
3554 || (in_main_unit && is_from_limited_with
3555 && Present (Freeze_Node (gnat_desig_rep))))
3557 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3561 /* Otherwise handle the case of a pointer to itself. */
3562 else if (gnat_desig_equiv == gnat_entity)
3565 = build_pointer_type_for_mode (void_type_node, p_mode,
3566 No_Strict_Aliasing (gnat_entity));
3567 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3570 /* If expansion is disabled, the equivalent type of a concurrent
3571 type is absent, so build a dummy pointer type. */
3572 else if (type_annotate_only && No (gnat_desig_equiv))
3573 gnu_type = ptr_void_type_node;
3575 /* Finally, handle the straightforward case where we can just
3576 elaborate our designated type and point to it. */
3578 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3580 /* It is possible that a call to gnat_to_gnu_type above resolved our
3581 type. If so, just return it. */
3582 if (present_gnu_tree (gnat_entity))
3584 maybe_present = true;
3588 /* If we have a GCC type for the designated type, possibly modify it
3589 if we are pointing only to constant objects and then make a pointer
3590 to it. Don't do this for unconstrained arrays. */
3591 if (!gnu_type && gnu_desig_type)
3593 if (Is_Access_Constant (gnat_entity)
3594 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3597 = build_qualified_type
3599 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3601 /* Some extra processing is required if we are building a
3602 pointer to an incomplete type (in the GCC sense). We might
3603 have such a type if we just made a dummy, or directly out
3604 of the call to gnat_to_gnu_type above if we are processing
3605 an access type for a record component designating the
3606 record type itself. */
3607 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3609 /* We must ensure that the pointer to variant we make will
3610 be processed by update_pointer_to when the initial type
3611 is completed. Pretend we made a dummy and let further
3612 processing act as usual. */
3615 /* We must ensure that update_pointer_to will not retrieve
3616 the dummy variant when building a properly qualified
3617 version of the complete type. We take advantage of the
3618 fact that get_qualified_type is requiring TYPE_NAMEs to
3619 match to influence build_qualified_type and then also
3620 update_pointer_to here. */
3621 TYPE_NAME (gnu_desig_type)
3622 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3627 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3628 No_Strict_Aliasing (gnat_entity));
3631 /* If we are not defining this object and we made a dummy pointer,
3632 save our current definition, evaluate the actual type, and replace
3633 the tentative type we made with the actual one. If we are to defer
3634 actually looking up the actual type, make an entry in the
3635 deferred list. If this is from a limited with, we have to defer
3636 to the end of the current spec in two cases: first if the
3637 designated type is in the current unit and second if the access
3639 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3642 = TYPE_FAT_POINTER_P (gnu_type)
3643 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3645 if (esize == POINTER_SIZE
3646 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3648 = build_pointer_type
3649 (TYPE_OBJECT_RECORD_TYPE
3650 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3652 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3653 !Comes_From_Source (gnat_entity),
3654 debug_info_p, gnat_entity);
3655 this_made_decl = true;
3656 gnu_type = TREE_TYPE (gnu_decl);
3657 save_gnu_tree (gnat_entity, gnu_decl, false);
3660 if (defer_incomplete_level == 0
3661 && ! (is_from_limited_with
3663 || In_Extended_Main_Code_Unit (gnat_entity))))
3664 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3665 gnat_to_gnu_type (gnat_desig_equiv));
3667 /* Note that the call to gnat_to_gnu_type here might have
3668 updated gnu_old_type directly, in which case it is not a
3669 dummy type any more when we get into update_pointer_to.
3671 This may happen for instance when the designated type is a
3672 record type, because their elaboration starts with an
3673 initial node from make_dummy_type, which may yield the same
3674 node as the one we got.
3676 Besides, variants of this non-dummy type might have been
3677 created along the way. update_pointer_to is expected to
3678 properly take care of those situations. */
3681 struct incomplete *p
3682 = (struct incomplete *) xmalloc (sizeof
3683 (struct incomplete));
3684 struct incomplete **head
3685 = (is_from_limited_with
3687 || In_Extended_Main_Code_Unit (gnat_entity))
3688 ? &defer_limited_with : &defer_incomplete_list);
3690 p->old_type = gnu_old_type;
3691 p->full_type = gnat_desig_equiv;
3699 case E_Access_Protected_Subprogram_Type:
3700 case E_Anonymous_Access_Protected_Subprogram_Type:
3701 if (type_annotate_only && No (gnat_equiv_type))
3702 gnu_type = ptr_void_type_node;
3705 /* The runtime representation is the equivalent type. */
3706 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3707 maybe_present = true;
3710 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3711 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3712 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3713 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3714 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3719 case E_Access_Subtype:
3721 /* We treat this as identical to its base type; any constraint is
3722 meaningful only to the front end.
3724 The designated type must be elaborated as well, if it does
3725 not have its own freeze node. Designated (sub)types created
3726 for constrained components of records with discriminants are
3727 not frozen by the front end and thus not elaborated by gigi,
3728 because their use may appear before the base type is frozen,
3729 and because it is not clear that they are needed anywhere in
3730 Gigi. With the current model, there is no correct place where
3731 they could be elaborated. */
3733 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3734 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3735 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3736 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3737 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3739 /* If we are not defining this entity, and we have incomplete
3740 entities being processed above us, make a dummy type and
3741 elaborate it later. */
3742 if (!definition && defer_incomplete_level != 0)
3744 struct incomplete *p
3745 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3747 = build_pointer_type
3748 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3750 p->old_type = TREE_TYPE (gnu_ptr_type);
3751 p->full_type = Directly_Designated_Type (gnat_entity);
3752 p->next = defer_incomplete_list;
3753 defer_incomplete_list = p;
3755 else if (!IN (Ekind (Base_Type
3756 (Directly_Designated_Type (gnat_entity))),
3757 Incomplete_Or_Private_Kind))
3758 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3762 maybe_present = true;
3765 /* Subprogram Entities
3767 The following access functions are defined for subprograms (functions
3770 First_Formal The first formal parameter.
3771 Is_Imported Indicates that the subprogram has appeared in
3772 an INTERFACE or IMPORT pragma. For now we
3773 assume that the external language is C.
3774 Is_Exported Likewise but for an EXPORT pragma.
3775 Is_Inlined True if the subprogram is to be inlined.
3777 In addition for function subprograms we have:
3779 Etype Return type of the function.
3781 Each parameter is first checked by calling must_pass_by_ref on its
3782 type to determine if it is passed by reference. For parameters which
3783 are copied in, if they are Ada In Out or Out parameters, their return
3784 value becomes part of a record which becomes the return type of the
3785 function (C function - note that this applies only to Ada procedures
3786 so there is no Ada return type). Additional code to store back the
3787 parameters will be generated on the caller side. This transformation
3788 is done here, not in the front-end.
3790 The intended result of the transformation can be seen from the
3791 equivalent source rewritings that follow:
3793 struct temp {int a,b};
3794 procedure P (A,B: In Out ...) is temp P (int A,B)
3797 end P; return {A,B};
3804 For subprogram types we need to perform mainly the same conversions to
3805 GCC form that are needed for procedures and function declarations. The
3806 only difference is that at the end, we make a type declaration instead
3807 of a function declaration. */
3809 case E_Subprogram_Type:
3813 /* The first GCC parameter declaration (a PARM_DECL node). The
3814 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3815 actually is the head of this parameter list. */
3816 tree gnu_param_list = NULL_TREE;
3817 /* Likewise for the stub associated with an exported procedure. */
3818 tree gnu_stub_param_list = NULL_TREE;
3819 /* The type returned by a function. If the subprogram is a procedure
3820 this type should be void_type_node. */
3821 tree gnu_return_type = void_type_node;
3822 /* List of fields in return type of procedure with copy-in copy-out
3824 tree gnu_field_list = NULL_TREE;
3825 /* Non-null for subprograms containing parameters passed by copy-in
3826 copy-out (Ada In Out or Out parameters not passed by reference),
3827 in which case it is the list of nodes used to specify the values of
3828 the in out/out parameters that are returned as a record upon
3829 procedure return. The TREE_PURPOSE of an element of this list is
3830 a field of the record and the TREE_VALUE is the PARM_DECL
3831 corresponding to that field. This list will be saved in the
3832 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3833 tree gnu_return_list = NULL_TREE;
3834 /* If an import pragma asks to map this subprogram to a GCC builtin,
3835 this is the builtin DECL node. */
3836 tree gnu_builtin_decl = NULL_TREE;
3837 /* For the stub associated with an exported procedure. */
3838 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3839 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3840 Entity_Id gnat_param;
3841 bool inline_flag = Is_Inlined (gnat_entity);
3842 bool public_flag = Is_Public (gnat_entity) || imported_p;
3844 = (Is_Public (gnat_entity) && !definition) || imported_p;
3846 /* The semantics of "pure" in Ada essentially matches that of "const"
3847 in the back-end. In particular, both properties are orthogonal to
3848 the "nothrow" property if the EH circuitry is explicit in the
3849 internal representation of the back-end. If we are to completely
3850 hide the EH circuitry from it, we need to declare that calls to pure
3851 Ada subprograms that can throw have side effects since they can
3852 trigger an "abnormal" transfer of control flow; thus they can be
3853 neither "const" nor "pure" in the back-end sense. */
3855 = (Exception_Mechanism == Back_End_Exceptions
3856 && Is_Pure (gnat_entity));
3858 bool volatile_flag = No_Return (gnat_entity);
3859 bool returns_by_ref = false;
3860 bool returns_unconstrained = false;
3861 bool returns_by_target_ptr = false;
3862 bool has_copy_in_out = false;
3863 bool has_stub = false;
3866 if (kind == E_Subprogram_Type && !definition)
3867 /* A parameter may refer to this type, so defer completion
3868 of any incomplete types. */
3869 defer_incomplete_level++, this_deferred = true;
3871 /* If the subprogram has an alias, it is probably inherited, so
3872 we can use the original one. If the original "subprogram"
3873 is actually an enumeration literal, it may be the first use
3874 of its type, so we must elaborate that type now. */
3875 if (Present (Alias (gnat_entity)))
3877 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3878 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3880 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3883 /* Elaborate any Itypes in the parameters of this entity. */
3884 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3885 Present (gnat_temp);
3886 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3887 if (Is_Itype (Etype (gnat_temp)))
3888 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3893 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3894 corresponding DECL node.
3896 We still want the parameter associations to take place because the
3897 proper generation of calls depends on it (a GNAT parameter without
3898 a corresponding GCC tree has a very specific meaning), so we don't
3900 if (Convention (gnat_entity) == Convention_Intrinsic)
3901 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3903 /* ??? What if we don't find the builtin node above ? warn ? err ?
3904 In the current state we neither warn nor err, and calls will just
3905 be handled as for regular subprograms. */
3907 if (kind == E_Function || kind == E_Subprogram_Type)
3908 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3910 /* If this function returns by reference, make the actual
3911 return type of this function the pointer and mark the decl. */
3912 if (Returns_By_Ref (gnat_entity))
3914 returns_by_ref = true;
3915 gnu_return_type = build_pointer_type (gnu_return_type);
3918 /* If the Mechanism is By_Reference, ensure the return type uses
3919 the machine's by-reference mechanism, which may not the same
3920 as above (e.g., it might be by passing a fake parameter). */
3921 else if (kind == E_Function
3922 && Mechanism (gnat_entity) == By_Reference)
3924 TREE_ADDRESSABLE (gnu_return_type) = 1;
3926 /* We expect this bit to be reset by gigi shortly, so can avoid a
3927 type node copy here. This actually also prevents troubles with
3928 the generation of debug information for the function, because
3929 we might have issued such info for this type already, and would
3930 be attaching a distinct type node to the function if we made a
3934 /* If we are supposed to return an unconstrained array,
3935 actually return a fat pointer and make a note of that. Return
3936 a pointer to an unconstrained record of variable size. */
3937 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3939 gnu_return_type = TREE_TYPE (gnu_return_type);
3940 returns_unconstrained = true;
3943 /* If the type requires a transient scope, the result is allocated
3944 on the secondary stack, so the result type of the function is
3946 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3948 gnu_return_type = build_pointer_type (gnu_return_type);
3949 returns_unconstrained = true;
3952 /* If the type is a padded type and the underlying type would not
3953 be passed by reference or this function has a foreign convention,
3954 return the underlying type. */
3955 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3956 && TYPE_IS_PADDING_P (gnu_return_type)
3957 && (!default_pass_by_ref (TREE_TYPE
3958 (TYPE_FIELDS (gnu_return_type)))
3959 || Has_Foreign_Convention (gnat_entity)))
3960 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3962 /* If the return type has a non-constant size, we convert the function
3963 into a procedure and its caller will pass a pointer to an object as
3964 the first parameter when we call the function. This can happen for
3965 an unconstrained type with a maximum size or a constrained type with
3966 a size not known at compile time. */
3967 if (TYPE_SIZE_UNIT (gnu_return_type)
3968 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
3970 returns_by_target_ptr = true;
3972 = create_param_decl (get_identifier ("TARGET"),
3973 build_reference_type (gnu_return_type),
3975 gnu_return_type = void_type_node;
3978 /* If the return type has a size that overflows, we cannot have
3979 a function that returns that type. This usage doesn't make
3980 sense anyway, so give an error here. */
3981 if (TYPE_SIZE_UNIT (gnu_return_type)
3982 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3983 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3985 post_error ("cannot return type whose size overflows",
3987 gnu_return_type = copy_node (gnu_return_type);
3988 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3989 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3990 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3991 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3994 /* Look at all our parameters and get the type of
3995 each. While doing this, build a copy-out structure if
3998 /* Loop over the parameters and get their associated GCC tree.
3999 While doing this, build a copy-out structure if we need one. */
4000 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
4001 Present (gnat_param);
4002 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
4004 tree gnu_param_name = get_entity_name (gnat_param);
4005 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4006 tree gnu_param, gnu_field;
4007 bool copy_in_copy_out = false;
4008 Mechanism_Type mech = Mechanism (gnat_param);
4010 /* Builtins are expanded inline and there is no real call sequence
4011 involved. So the type expected by the underlying expander is
4012 always the type of each argument "as is". */
4013 if (gnu_builtin_decl)
4015 /* Handle the first parameter of a valued procedure specially. */
4016 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
4017 mech = By_Copy_Return;
4018 /* Otherwise, see if a Mechanism was supplied that forced this
4019 parameter to be passed one way or another. */
4020 else if (mech == Default
4021 || mech == By_Copy || mech == By_Reference)
4023 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4024 mech = By_Descriptor;
4026 else if (By_Short_Descriptor_Last <= mech &&
4027 mech <= By_Short_Descriptor)
4028 mech = By_Short_Descriptor;
4032 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4033 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4034 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4036 mech = By_Reference;
4042 post_error ("unsupported mechanism for&", gnat_param);
4047 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4048 Has_Foreign_Convention (gnat_entity),
4051 /* We are returned either a PARM_DECL or a type if no parameter
4052 needs to be passed; in either case, adjust the type. */
4053 if (DECL_P (gnu_param))
4054 gnu_param_type = TREE_TYPE (gnu_param);
4057 gnu_param_type = gnu_param;
4058 gnu_param = NULL_TREE;
4063 /* If it's an exported subprogram, we build a parameter list
4064 in parallel, in case we need to emit a stub for it. */
4065 if (Is_Exported (gnat_entity))
4068 = chainon (gnu_param, gnu_stub_param_list);
4069 /* Change By_Descriptor parameter to By_Reference for
4070 the internal version of an exported subprogram. */
4071 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4074 = gnat_to_gnu_param (gnat_param, By_Reference,
4080 gnu_param = copy_node (gnu_param);
4083 gnu_param_list = chainon (gnu_param, gnu_param_list);
4084 Sloc_to_locus (Sloc (gnat_param),
4085 &DECL_SOURCE_LOCATION (gnu_param));
4086 save_gnu_tree (gnat_param, gnu_param, false);
4088 /* If a parameter is a pointer, this function may modify
4089 memory through it and thus shouldn't be considered
4090 a const function. Also, the memory may be modified
4091 between two calls, so they can't be CSE'ed. The latter
4092 case also handles by-ref parameters. */
4093 if (POINTER_TYPE_P (gnu_param_type)
4094 || TYPE_FAT_POINTER_P (gnu_param_type))
4098 if (copy_in_copy_out)
4100 if (!has_copy_in_out)
4102 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4103 gnu_return_type = make_node (RECORD_TYPE);
4104 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4105 has_copy_in_out = true;
4108 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4109 gnu_return_type, 0, 0, 0, 0);
4110 Sloc_to_locus (Sloc (gnat_param),
4111 &DECL_SOURCE_LOCATION (gnu_field));
4112 TREE_CHAIN (gnu_field) = gnu_field_list;
4113 gnu_field_list = gnu_field;
4114 gnu_return_list = tree_cons (gnu_field, gnu_param,
4119 /* Do not compute record for out parameters if subprogram is
4120 stubbed since structures are incomplete for the back-end. */
4121 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4122 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4125 /* If we have a CICO list but it has only one entry, we convert
4126 this function into a function that simply returns that one
4128 if (list_length (gnu_return_list) == 1)
4129 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
4131 if (Has_Stdcall_Convention (gnat_entity))
4132 prepend_one_attribute_to
4133 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4134 get_identifier ("stdcall"), NULL_TREE,
4137 /* If we are on a target where stack realignment is needed for 'main'
4138 to honor GCC's implicit expectations (stack alignment greater than
4139 what the base ABI guarantees), ensure we do the same for foreign
4140 convention subprograms as they might be used as callbacks from code
4141 breaking such expectations. Note that this applies to task entry
4142 points in particular. */
4143 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4144 && Has_Foreign_Convention (gnat_entity))
4145 prepend_one_attribute_to
4146 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4147 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4150 /* The lists have been built in reverse. */
4151 gnu_param_list = nreverse (gnu_param_list);
4153 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4154 gnu_return_list = nreverse (gnu_return_list);
4156 if (Ekind (gnat_entity) == E_Function)
4157 Set_Mechanism (gnat_entity,
4158 (returns_by_ref || returns_unconstrained
4159 ? By_Reference : By_Copy));
4161 = create_subprog_type (gnu_return_type, gnu_param_list,
4162 gnu_return_list, returns_unconstrained,
4163 returns_by_ref, returns_by_target_ptr);
4167 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4168 gnu_return_list, returns_unconstrained,
4169 returns_by_ref, returns_by_target_ptr);
4171 /* A subprogram (something that doesn't return anything) shouldn't
4172 be considered const since there would be no reason for such a
4173 subprogram. Note that procedures with Out (or In Out) parameters
4174 have already been converted into a function with a return type. */
4175 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4179 = build_qualified_type (gnu_type,
4180 TYPE_QUALS (gnu_type)
4181 | (TYPE_QUAL_CONST * const_flag)
4182 | (TYPE_QUAL_VOLATILE * volatile_flag));
4184 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4188 = build_qualified_type (gnu_stub_type,
4189 TYPE_QUALS (gnu_stub_type)
4190 | (TYPE_QUAL_CONST * const_flag)
4191 | (TYPE_QUAL_VOLATILE * volatile_flag));
4193 /* If we have a builtin decl for that function, check the signatures
4194 compatibilities. If the signatures are compatible, use the builtin
4195 decl. If they are not, we expect the checker predicate to have
4196 posted the appropriate errors, and just continue with what we have
4198 if (gnu_builtin_decl)
4200 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4202 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4204 gnu_decl = gnu_builtin_decl;
4205 gnu_type = gnu_builtin_type;
4210 /* If there was no specified Interface_Name and the external and
4211 internal names of the subprogram are the same, only use the
4212 internal name to allow disambiguation of nested subprograms. */
4213 if (No (Interface_Name (gnat_entity))
4214 && gnu_ext_name == gnu_entity_name)
4215 gnu_ext_name = NULL_TREE;
4217 /* If we are defining the subprogram and it has an Address clause
4218 we must get the address expression from the saved GCC tree for the
4219 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4220 the address expression here since the front-end has guaranteed
4221 in that case that the elaboration has no effects. If there is
4222 an Address clause and we are not defining the object, just
4223 make it a constant. */
4224 if (Present (Address_Clause (gnat_entity)))
4226 tree gnu_address = NULL_TREE;
4230 = (present_gnu_tree (gnat_entity)
4231 ? get_gnu_tree (gnat_entity)
4232 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4234 save_gnu_tree (gnat_entity, NULL_TREE, false);
4236 /* Convert the type of the object to a reference type that can
4237 alias everything as per 13.3(19). */
4239 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4241 gnu_address = convert (gnu_type, gnu_address);
4244 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4245 gnu_address, false, Is_Public (gnat_entity),
4246 extern_flag, false, NULL, gnat_entity);
4247 DECL_BY_REF_P (gnu_decl) = 1;
4250 else if (kind == E_Subprogram_Type)
4251 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4252 !Comes_From_Source (gnat_entity),
4253 debug_info_p, gnat_entity);
4258 gnu_stub_name = gnu_ext_name;
4259 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4260 public_flag = false;
4263 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4264 gnu_type, gnu_param_list,
4265 inline_flag, public_flag,
4266 extern_flag, attr_list,
4271 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4272 gnu_stub_type, gnu_stub_param_list,
4274 extern_flag, attr_list,
4276 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4279 /* This is unrelated to the stub built right above. */
4280 DECL_STUBBED_P (gnu_decl)
4281 = Convention (gnat_entity) == Convention_Stubbed;
4286 case E_Incomplete_Type:
4287 case E_Incomplete_Subtype:
4288 case E_Private_Type:
4289 case E_Private_Subtype:
4290 case E_Limited_Private_Type:
4291 case E_Limited_Private_Subtype:
4292 case E_Record_Type_With_Private:
4293 case E_Record_Subtype_With_Private:
4295 /* Get the "full view" of this entity. If this is an incomplete
4296 entity from a limited with, treat its non-limited view as the
4297 full view. Otherwise, use either the full view or the underlying
4298 full view, whichever is present. This is used in all the tests
4301 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4302 && From_With_Type (gnat_entity))
4303 ? Non_Limited_View (gnat_entity)
4304 : Present (Full_View (gnat_entity))
4305 ? Full_View (gnat_entity)
4306 : Underlying_Full_View (gnat_entity);
4308 /* If this is an incomplete type with no full view, it must be a Taft
4309 Amendment type, in which case we return a dummy type. Otherwise,
4310 just get the type from its Etype. */
4313 if (kind == E_Incomplete_Type)
4315 gnu_type = make_dummy_type (gnat_entity);
4316 gnu_decl = TYPE_STUB_DECL (gnu_type);
4320 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4322 maybe_present = true;
4327 /* If we already made a type for the full view, reuse it. */
4328 else if (present_gnu_tree (full_view))
4330 gnu_decl = get_gnu_tree (full_view);
4334 /* Otherwise, if we are not defining the type now, get the type
4335 from the full view. But always get the type from the full view
4336 for define on use types, since otherwise we won't see them! */
4337 else if (!definition
4338 || (Is_Itype (full_view)
4339 && No (Freeze_Node (gnat_entity)))
4340 || (Is_Itype (gnat_entity)
4341 && No (Freeze_Node (full_view))))
4343 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4344 maybe_present = true;
4348 /* For incomplete types, make a dummy type entry which will be
4349 replaced later. Save it as the full declaration's type so
4350 we can do any needed updates when we see it. */
4351 gnu_type = make_dummy_type (gnat_entity);
4352 gnu_decl = TYPE_STUB_DECL (gnu_type);
4353 save_gnu_tree (full_view, gnu_decl, 0);
4357 /* Simple class_wide types are always viewed as their root_type
4358 by Gigi unless an Equivalent_Type is specified. */
4359 case E_Class_Wide_Type:
4360 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4361 maybe_present = true;
4365 case E_Task_Subtype:
4366 case E_Protected_Type:
4367 case E_Protected_Subtype:
4368 if (type_annotate_only && No (gnat_equiv_type))
4369 gnu_type = void_type_node;
4371 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4373 maybe_present = true;
4377 gnu_decl = create_label_decl (gnu_entity_name);
4382 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4383 we've already saved it, so we don't try to. */
4384 gnu_decl = error_mark_node;
4392 /* If we had a case where we evaluated another type and it might have
4393 defined this one, handle it here. */
4394 if (maybe_present && present_gnu_tree (gnat_entity))
4396 gnu_decl = get_gnu_tree (gnat_entity);
4400 /* If we are processing a type and there is either no decl for it or
4401 we just made one, do some common processing for the type, such as
4402 handling alignment and possible padding. */
4403 if (is_type && (!gnu_decl || this_made_decl))
4405 if (Is_Tagged_Type (gnat_entity)
4406 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4407 TYPE_ALIGN_OK (gnu_type) = 1;
4409 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4410 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4412 /* ??? Don't set the size for a String_Literal since it is either
4413 confirming or we don't handle it properly (if the low bound is
4415 if (!gnu_size && kind != E_String_Literal_Subtype)
4416 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4418 Has_Size_Clause (gnat_entity));
4420 /* If a size was specified, see if we can make a new type of that size
4421 by rearranging the type, for example from a fat to a thin pointer. */
4425 = make_type_from_size (gnu_type, gnu_size,
4426 Has_Biased_Representation (gnat_entity));
4428 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4429 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4433 /* If the alignment hasn't already been processed and this is
4434 not an unconstrained array, see if an alignment is specified.
4435 If not, we pick a default alignment for atomic objects. */
4436 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4438 else if (Known_Alignment (gnat_entity))
4440 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4441 TYPE_ALIGN (gnu_type));
4443 /* Warn on suspiciously large alignments. This should catch
4444 errors about the (alignment,byte)/(size,bit) discrepancy. */
4445 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4449 /* If a size was specified, take it into account. Otherwise
4450 use the RM size for records as the type size has already
4451 been adjusted to the alignment. */
4454 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4455 || TREE_CODE (gnu_type) == UNION_TYPE
4456 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4457 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4458 size = rm_size (gnu_type);
4460 size = TYPE_SIZE (gnu_type);
4462 /* Consider an alignment as suspicious if the alignment/size
4463 ratio is greater or equal to the byte/bit ratio. */
4464 if (host_integerp (size, 1)
4465 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4466 post_error_ne ("?suspiciously large alignment specified for&",
4467 Expression (Alignment_Clause (gnat_entity)),
4471 else if (Is_Atomic (gnat_entity) && !gnu_size
4472 && host_integerp (TYPE_SIZE (gnu_type), 1)
4473 && integer_pow2p (TYPE_SIZE (gnu_type)))
4474 align = MIN (BIGGEST_ALIGNMENT,
4475 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4476 else if (Is_Atomic (gnat_entity) && gnu_size
4477 && host_integerp (gnu_size, 1)
4478 && integer_pow2p (gnu_size))
4479 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4481 /* See if we need to pad the type. If we did, and made a record,
4482 the name of the new type may be changed. So get it back for
4483 us when we make the new TYPE_DECL below. */
4484 if (gnu_size || align > 0)
4485 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4486 "PAD", true, definition, false);
4488 if (TREE_CODE (gnu_type) == RECORD_TYPE
4489 && TYPE_IS_PADDING_P (gnu_type))
4491 gnu_entity_name = TYPE_NAME (gnu_type);
4492 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4493 gnu_entity_name = DECL_NAME (gnu_entity_name);
4496 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4498 /* If we are at global level, GCC will have applied variable_size to
4499 the type, but that won't have done anything. So, if it's not
4500 a constant or self-referential, call elaborate_expression_1 to
4501 make a variable for the size rather than calculating it each time.
4502 Handle both the RM size and the actual size. */
4503 if (global_bindings_p ()
4504 && TYPE_SIZE (gnu_type)
4505 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4506 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4508 if (TREE_CODE (gnu_type) == RECORD_TYPE
4509 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4510 TYPE_SIZE (gnu_type), 0))
4512 TYPE_SIZE (gnu_type)
4513 = elaborate_expression_1 (gnat_entity, gnat_entity,
4514 TYPE_SIZE (gnu_type),
4515 get_identifier ("SIZE"),
4517 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4521 TYPE_SIZE (gnu_type)
4522 = elaborate_expression_1 (gnat_entity, gnat_entity,
4523 TYPE_SIZE (gnu_type),
4524 get_identifier ("SIZE"),
4527 /* ??? For now, store the size as a multiple of the alignment
4528 in bytes so that we can see the alignment from the tree. */
4529 TYPE_SIZE_UNIT (gnu_type)
4531 (MULT_EXPR, sizetype,
4532 elaborate_expression_1
4533 (gnat_entity, gnat_entity,
4534 build_binary_op (EXACT_DIV_EXPR, sizetype,
4535 TYPE_SIZE_UNIT (gnu_type),
4536 size_int (TYPE_ALIGN (gnu_type)
4538 get_identifier ("SIZE_A_UNIT"),
4540 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4542 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4545 elaborate_expression_1 (gnat_entity,
4547 TYPE_ADA_SIZE (gnu_type),
4548 get_identifier ("RM_SIZE"),
4553 /* If this is a record type or subtype, call elaborate_expression_1 on
4554 any field position. Do this for both global and local types.
4555 Skip any fields that we haven't made trees for to avoid problems with
4556 class wide types. */
4557 if (IN (kind, Record_Kind))
4558 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4559 gnat_temp = Next_Entity (gnat_temp))
4560 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4562 tree gnu_field = get_gnu_tree (gnat_temp);
4564 /* ??? Unfortunately, GCC needs to be able to prove the
4565 alignment of this offset and if it's a variable, it can't.
4566 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4567 right now, we have to put in an explicit multiply and
4568 divide by that value. */
4569 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4571 DECL_FIELD_OFFSET (gnu_field)
4573 (MULT_EXPR, sizetype,
4574 elaborate_expression_1
4575 (gnat_temp, gnat_temp,
4576 build_binary_op (EXACT_DIV_EXPR, sizetype,
4577 DECL_FIELD_OFFSET (gnu_field),
4578 size_int (DECL_OFFSET_ALIGN (gnu_field)
4580 get_identifier ("OFFSET"),
4582 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4584 /* ??? The context of gnu_field is not necessarily gnu_type so
4585 the MULT_EXPR node built above may not be marked by the call
4586 to create_type_decl below. */
4587 if (global_bindings_p ())
4588 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4592 gnu_type = build_qualified_type (gnu_type,
4593 (TYPE_QUALS (gnu_type)
4594 | (TYPE_QUAL_VOLATILE
4595 * Treat_As_Volatile (gnat_entity))));
4597 if (Is_Atomic (gnat_entity))
4598 check_ok_for_atomic (gnu_type, gnat_entity, false);
4600 if (Present (Alignment_Clause (gnat_entity)))
4601 TYPE_USER_ALIGN (gnu_type) = 1;
4603 if (Universal_Aliasing (gnat_entity))
4604 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4607 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4608 !Comes_From_Source (gnat_entity),
4609 debug_info_p, gnat_entity);
4611 TREE_TYPE (gnu_decl) = gnu_type;
4614 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4616 gnu_type = TREE_TYPE (gnu_decl);
4618 /* If this is a derived type, relate its alias set to that of its parent
4619 to avoid troubles when a call to an inherited primitive is inlined in
4620 a context where a derived object is accessed. The inlined code works
4621 on the parent view so the resulting code may access the same object
4622 using both the parent and the derived alias sets, which thus have to
4623 conflict. As the same issue arises with component references, the
4624 parent alias set also has to conflict with composite types enclosing
4625 derived components. For instance, if we have:
4632 we want T to conflict with both D and R, in addition to R being a
4633 superset of D by record/component construction.
4635 One way to achieve this is to perform an alias set copy from the
4636 parent to the derived type. This is not quite appropriate, though,
4637 as we don't want separate derived types to conflict with each other:
4639 type I1 is new Integer;
4640 type I2 is new Integer;
4642 We want I1 and I2 to both conflict with Integer but we do not want
4643 I1 to conflict with I2, and an alias set copy on derivation would
4646 The option chosen is to make the alias set of the derived type a
4647 superset of that of its parent type. It trivially fulfills the
4648 simple requirement for the Integer derivation example above, and
4649 the component case as well by superset transitivity:
4652 R ----------> D ----------> T
4654 The language rules ensure the parent type is already frozen here. */
4655 if (Is_Derived_Type (gnat_entity))
4657 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4658 relate_alias_sets (gnu_type, gnu_parent_type, ALIAS_SET_SUPERSET);
4661 /* Back-annotate the Alignment of the type if not already in the
4662 tree. Likewise for sizes. */
4663 if (Unknown_Alignment (gnat_entity))
4665 unsigned int double_align, align;
4666 bool is_capped_double, align_clause;
4668 /* If the default alignment of "double" or larger scalar types is
4669 specifically capped and this is not an array with an alignment
4670 clause on the component type, return the cap. */
4671 if ((double_align = double_float_alignment) > 0)
4673 = is_double_float_or_array (gnat_entity, &align_clause);
4674 else if ((double_align = double_scalar_alignment) > 0)
4676 = is_double_scalar_or_array (gnat_entity, &align_clause);
4678 is_capped_double = align_clause = false;
4680 if (is_capped_double && !align_clause)
4681 align = double_align;
4683 align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
4685 Set_Alignment (gnat_entity, UI_From_Int (align));
4688 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4690 /* If the size is self-referential, we annotate the maximum
4691 value of that size. */
4692 tree gnu_size = TYPE_SIZE (gnu_type);
4694 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4695 gnu_size = max_size (gnu_size, true);
4697 Set_Esize (gnat_entity, annotate_value (gnu_size));
4699 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4701 /* In this mode the tag and the parent components are not
4702 generated by the front-end, so the sizes must be adjusted
4704 int size_offset, new_size;
4706 if (Is_Derived_Type (gnat_entity))
4709 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4710 Set_Alignment (gnat_entity,
4711 Alignment (Etype (Base_Type (gnat_entity))));
4714 size_offset = POINTER_SIZE;
4716 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4717 Set_Esize (gnat_entity,
4718 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4719 / POINTER_SIZE) * POINTER_SIZE));
4720 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4724 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4725 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4728 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4729 DECL_ARTIFICIAL (gnu_decl) = 1;
4731 if (!debug_info_p && DECL_P (gnu_decl)
4732 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4733 && No (Renamed_Object (gnat_entity)))
4734 DECL_IGNORED_P (gnu_decl) = 1;
4736 /* If we haven't already, associate the ..._DECL node that we just made with
4737 the input GNAT entity node. */
4739 save_gnu_tree (gnat_entity, gnu_decl, false);
4741 /* If this is an enumeration or floating-point type, we were not able to set
4742 the bounds since they refer to the type. These are always static. */
4743 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4744 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4746 tree gnu_scalar_type = gnu_type;
4748 /* If this is a padded type, we need to use the underlying type. */
4749 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4750 && TYPE_IS_PADDING_P (gnu_scalar_type))
4751 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4753 /* If this is a floating point type and we haven't set a floating
4754 point type yet, use this in the evaluation of the bounds. */
4755 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4756 longest_float_type_node = gnu_scalar_type;
4758 TYPE_MIN_VALUE (gnu_scalar_type)
4759 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4760 TYPE_MAX_VALUE (gnu_scalar_type)
4761 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4763 /* For enumeration types, write full debugging information. */
4764 if (kind == E_Enumeration_Type)
4766 /* Since this has both a typedef and a tag, avoid outputting
4768 DECL_ARTIFICIAL (gnu_decl) = 1;
4769 rest_of_type_decl_compilation (gnu_decl);
4773 /* If we deferred processing of incomplete types, re-enable it. If there
4774 were no other disables and we have some to process, do so. */
4775 if (this_deferred && --defer_incomplete_level == 0)
4777 if (defer_incomplete_list)
4779 struct incomplete *incp, *next;
4781 /* We are back to level 0 for the deferring of incomplete types.
4782 But processing these incomplete types below may itself require
4783 deferring, so preserve what we have and restart from scratch. */
4784 incp = defer_incomplete_list;
4785 defer_incomplete_list = NULL;
4787 /* For finalization, however, all types must be complete so we
4788 cannot do the same because deferred incomplete types may end up
4789 referencing each other. Process them all recursively first. */
4790 defer_finalize_level++;
4792 for (; incp; incp = next)
4797 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4798 gnat_to_gnu_type (incp->full_type));
4802 defer_finalize_level--;
4805 /* All the deferred incomplete types have been processed so we can
4806 now proceed with the finalization of the deferred types. */
4807 if (defer_finalize_level == 0 && defer_finalize_list)
4812 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4813 rest_of_type_decl_compilation_no_defer (t);
4815 VEC_free (tree, heap, defer_finalize_list);
4819 /* If we are not defining this type, see if it's in the incomplete list.
4820 If so, handle that list entry now. */
4821 else if (!definition)
4823 struct incomplete *incp;
4825 for (incp = defer_incomplete_list; incp; incp = incp->next)
4826 if (incp->old_type && incp->full_type == gnat_entity)
4828 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4829 TREE_TYPE (gnu_decl));
4830 incp->old_type = NULL_TREE;
4837 /* If this is a packed array type whose original array type is itself
4838 an Itype without freeze node, make sure the latter is processed. */
4839 if (Is_Packed_Array_Type (gnat_entity)
4840 && Is_Itype (Original_Array_Type (gnat_entity))
4841 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4842 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4843 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4848 /* Similar, but if the returned value is a COMPONENT_REF, return the
4852 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4854 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4856 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4857 gnu_field = TREE_OPERAND (gnu_field, 1);
4862 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4863 the GCC type corresponding to that entity. */
4866 gnat_to_gnu_type (Entity_Id gnat_entity)
4870 /* The back end never attempts to annotate generic types. */
4871 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4872 return void_type_node;
4874 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4875 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4877 return TREE_TYPE (gnu_decl);
4880 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4881 the unpadded version of the GCC type corresponding to that entity. */
4884 get_unpadded_type (Entity_Id gnat_entity)
4886 tree type = gnat_to_gnu_type (gnat_entity);
4888 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4889 type = TREE_TYPE (TYPE_FIELDS (type));
4894 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4895 Every TYPE_DECL generated for a type definition must be passed
4896 to this function once everything else has been done for it. */
4899 rest_of_type_decl_compilation (tree decl)
4901 /* We need to defer finalizing the type if incomplete types
4902 are being deferred or if they are being processed. */
4903 if (defer_incomplete_level || defer_finalize_level)
4904 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4906 rest_of_type_decl_compilation_no_defer (decl);
4909 /* Same as above but without deferring the compilation. This
4910 function should not be invoked directly on a TYPE_DECL. */
4913 rest_of_type_decl_compilation_no_defer (tree decl)
4915 const int toplev = global_bindings_p ();
4916 tree t = TREE_TYPE (decl);
4918 rest_of_decl_compilation (decl, toplev, 0);
4920 /* Now process all the variants. This is needed for STABS. */
4921 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4923 if (t == TREE_TYPE (decl))
4926 if (!TYPE_STUB_DECL (t))
4927 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4929 rest_of_type_compilation (t, toplev);
4933 /* Finalize any From_With_Type incomplete types. We do this after processing
4934 our compilation unit and after processing its spec, if this is a body. */
4937 finalize_from_with_types (void)
4939 struct incomplete *incp = defer_limited_with;
4940 struct incomplete *next;
4942 defer_limited_with = 0;
4943 for (; incp; incp = next)
4947 if (incp->old_type != 0)
4948 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4949 gnat_to_gnu_type (incp->full_type));
4954 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4955 kind of type (such E_Task_Type) that has a different type which Gigi
4956 uses for its representation. If the type does not have a special type
4957 for its representation, return GNAT_ENTITY. If a type is supposed to
4958 exist, but does not, abort unless annotating types, in which case
4959 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4962 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4964 Entity_Id gnat_equiv = gnat_entity;
4966 if (No (gnat_entity))
4969 switch (Ekind (gnat_entity))
4971 case E_Class_Wide_Subtype:
4972 if (Present (Equivalent_Type (gnat_entity)))
4973 gnat_equiv = Equivalent_Type (gnat_entity);
4976 case E_Access_Protected_Subprogram_Type:
4977 case E_Anonymous_Access_Protected_Subprogram_Type:
4978 gnat_equiv = Equivalent_Type (gnat_entity);
4981 case E_Class_Wide_Type:
4982 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
4983 ? Equivalent_Type (gnat_entity)
4984 : Root_Type (gnat_entity));
4988 case E_Task_Subtype:
4989 case E_Protected_Type:
4990 case E_Protected_Subtype:
4991 gnat_equiv = Corresponding_Record_Type (gnat_entity);
4998 gcc_assert (Present (gnat_equiv) || type_annotate_only);
5002 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
5003 using MECH as its passing mechanism, to be placed in the parameter
5004 list built for GNAT_SUBPROG. Assume a foreign convention for the
5005 latter if FOREIGN is true. Also set CICO to true if the parameter
5006 must use the copy-in copy-out implementation mechanism.
5008 The returned tree is a PARM_DECL, except for those cases where no
5009 parameter needs to be actually passed to the subprogram; the type
5010 of this "shadow" parameter is then returned instead. */
5013 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
5014 Entity_Id gnat_subprog, bool foreign, bool *cico)
5016 tree gnu_param_name = get_entity_name (gnat_param);
5017 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
5018 tree gnu_param_type_alt = NULL_TREE;
5019 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
5020 /* The parameter can be indirectly modified if its address is taken. */
5021 bool ro_param = in_param && !Address_Taken (gnat_param);
5022 bool by_return = false, by_component_ptr = false, by_ref = false;
5025 /* Copy-return is used only for the first parameter of a valued procedure.
5026 It's a copy mechanism for which a parameter is never allocated. */
5027 if (mech == By_Copy_Return)
5029 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5034 /* If this is either a foreign function or if the underlying type won't
5035 be passed by reference, strip off possible padding type. */
5036 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
5037 && TYPE_IS_PADDING_P (gnu_param_type))
5039 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5041 if (mech == By_Reference
5043 || (!must_pass_by_ref (unpadded_type)
5044 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5045 gnu_param_type = unpadded_type;
5048 /* If this is a read-only parameter, make a variant of the type that is
5049 read-only. ??? However, if this is an unconstrained array, that type
5050 can be very complex, so skip it for now. Likewise for any other
5051 self-referential type. */
5053 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5054 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5055 gnu_param_type = build_qualified_type (gnu_param_type,
5056 (TYPE_QUALS (gnu_param_type)
5057 | TYPE_QUAL_CONST));
5059 /* For foreign conventions, pass arrays as pointers to the element type.
5060 First check for unconstrained array and get the underlying array. */
5061 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5063 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5065 /* VMS descriptors are themselves passed by reference. */
5066 if (mech == By_Short_Descriptor ||
5067 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5069 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5070 Mechanism (gnat_param),
5072 else if (mech == By_Descriptor)
5074 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5075 chosen in fill_vms_descriptor. */
5077 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5078 Mechanism (gnat_param),
5081 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5082 Mechanism (gnat_param),
5086 /* Arrays are passed as pointers to element type for foreign conventions. */
5089 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5091 /* Strip off any multi-dimensional entries, then strip
5092 off the last array to get the component type. */
5093 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5094 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5095 gnu_param_type = TREE_TYPE (gnu_param_type);
5097 by_component_ptr = true;
5098 gnu_param_type = TREE_TYPE (gnu_param_type);
5101 gnu_param_type = build_qualified_type (gnu_param_type,
5102 (TYPE_QUALS (gnu_param_type)
5103 | TYPE_QUAL_CONST));
5105 gnu_param_type = build_pointer_type (gnu_param_type);
5108 /* Fat pointers are passed as thin pointers for foreign conventions. */
5109 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
5111 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5113 /* If we must pass or were requested to pass by reference, do so.
5114 If we were requested to pass by copy, do so.
5115 Otherwise, for foreign conventions, pass In Out or Out parameters
5116 or aggregates by reference. For COBOL and Fortran, pass all
5117 integer and FP types that way too. For Convention Ada, use
5118 the standard Ada default. */
5119 else if (must_pass_by_ref (gnu_param_type)
5120 || mech == By_Reference
5123 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5125 && (Convention (gnat_subprog) == Convention_Fortran
5126 || Convention (gnat_subprog) == Convention_COBOL)
5127 && (INTEGRAL_TYPE_P (gnu_param_type)
5128 || FLOAT_TYPE_P (gnu_param_type)))
5130 && default_pass_by_ref (gnu_param_type)))))
5132 gnu_param_type = build_reference_type (gnu_param_type);
5136 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5140 if (mech == By_Copy && (by_ref || by_component_ptr))
5141 post_error ("?cannot pass & by copy", gnat_param);
5143 /* If this is an Out parameter that isn't passed by reference and isn't
5144 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5145 it will be a VAR_DECL created when we process the procedure, so just
5146 return its type. For the special parameter of a valued procedure,
5149 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5150 Out parameters with discriminants or implicit initial values to be
5151 handled like In Out parameters. These type are normally built as
5152 aggregates, hence passed by reference, except for some packed arrays
5153 which end up encoded in special integer types.
5155 The exception we need to make is then for packed arrays of records
5156 with discriminants or implicit initial values. We have no light/easy
5157 way to check for the latter case, so we merely check for packed arrays
5158 of records. This may lead to useless copy-in operations, but in very
5159 rare cases only, as these would be exceptions in a set of already
5160 exceptional situations. */
5161 if (Ekind (gnat_param) == E_Out_Parameter
5164 || (mech != By_Descriptor
5165 && mech != By_Short_Descriptor
5166 && !POINTER_TYPE_P (gnu_param_type)
5167 && !AGGREGATE_TYPE_P (gnu_param_type)))
5168 && !(Is_Array_Type (Etype (gnat_param))
5169 && Is_Packed (Etype (gnat_param))
5170 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5171 return gnu_param_type;
5173 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5174 ro_param || by_ref || by_component_ptr);
5175 DECL_BY_REF_P (gnu_param) = by_ref;
5176 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5177 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5178 mech == By_Short_Descriptor);
5179 DECL_POINTS_TO_READONLY_P (gnu_param)
5180 = (ro_param && (by_ref || by_component_ptr));
5182 /* Save the alternate descriptor type, if any. */
5183 if (gnu_param_type_alt)
5184 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5186 /* If no Mechanism was specified, indicate what we're using, then
5187 back-annotate it. */
5188 if (mech == Default)
5189 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5191 Set_Mechanism (gnat_param, mech);
5195 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5198 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5200 while (Present (Corresponding_Discriminant (discr1)))
5201 discr1 = Corresponding_Discriminant (discr1);
5203 while (Present (Corresponding_Discriminant (discr2)))
5204 discr2 = Corresponding_Discriminant (discr2);
5207 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5210 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
5211 a non-aliased component in the back-end sense. */
5214 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
5216 /* If the type below this is a multi-array type, then
5217 this does not have aliased components. */
5218 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5219 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5222 if (Has_Aliased_Components (gnat_type))
5225 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5228 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5231 compile_time_known_address_p (Node_Id gnat_address)
5233 /* Catch System'To_Address. */
5234 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5235 gnat_address = Expression (gnat_address);
5237 return Compile_Time_Known_Value (gnat_address);
5240 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5241 be elaborated at the point of its definition, but do nothing else. */
5244 elaborate_entity (Entity_Id gnat_entity)
5246 switch (Ekind (gnat_entity))
5248 case E_Signed_Integer_Subtype:
5249 case E_Modular_Integer_Subtype:
5250 case E_Enumeration_Subtype:
5251 case E_Ordinary_Fixed_Point_Subtype:
5252 case E_Decimal_Fixed_Point_Subtype:
5253 case E_Floating_Point_Subtype:
5255 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5256 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5258 /* ??? Tests to avoid Constraint_Error in static expressions
5259 are needed until after the front stops generating bogus
5260 conversions on bounds of real types. */
5261 if (!Raises_Constraint_Error (gnat_lb))
5262 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5263 1, 0, Needs_Debug_Info (gnat_entity));
5264 if (!Raises_Constraint_Error (gnat_hb))
5265 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5266 1, 0, Needs_Debug_Info (gnat_entity));
5272 Node_Id full_definition = Declaration_Node (gnat_entity);
5273 Node_Id record_definition = Type_Definition (full_definition);
5275 /* If this is a record extension, go a level further to find the
5276 record definition. */
5277 if (Nkind (record_definition) == N_Derived_Type_Definition)
5278 record_definition = Record_Extension_Part (record_definition);
5282 case E_Record_Subtype:
5283 case E_Private_Subtype:
5284 case E_Limited_Private_Subtype:
5285 case E_Record_Subtype_With_Private:
5286 if (Is_Constrained (gnat_entity)
5287 && Has_Discriminants (Base_Type (gnat_entity))
5288 && Present (Discriminant_Constraint (gnat_entity)))
5290 Node_Id gnat_discriminant_expr;
5291 Entity_Id gnat_field;
5293 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
5294 gnat_discriminant_expr
5295 = First_Elmt (Discriminant_Constraint (gnat_entity));
5296 Present (gnat_field);
5297 gnat_field = Next_Discriminant (gnat_field),
5298 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5299 /* ??? For now, ignore access discriminants. */
5300 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5301 elaborate_expression (Node (gnat_discriminant_expr),
5303 get_entity_name (gnat_field), 1, 0, 0);
5310 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5311 any entities on its entity chain similarly. */
5314 mark_out_of_scope (Entity_Id gnat_entity)
5316 Entity_Id gnat_sub_entity;
5317 unsigned int kind = Ekind (gnat_entity);
5319 /* If this has an entity list, process all in the list. */
5320 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5321 || IN (kind, Private_Kind)
5322 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5323 || kind == E_Function || kind == E_Generic_Function
5324 || kind == E_Generic_Package || kind == E_Generic_Procedure
5325 || kind == E_Loop || kind == E_Operator || kind == E_Package
5326 || kind == E_Package_Body || kind == E_Procedure
5327 || kind == E_Record_Type || kind == E_Record_Subtype
5328 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5329 for (gnat_sub_entity = First_Entity (gnat_entity);
5330 Present (gnat_sub_entity);
5331 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5332 if (Scope (gnat_sub_entity) == gnat_entity
5333 && gnat_sub_entity != gnat_entity)
5334 mark_out_of_scope (gnat_sub_entity);
5336 /* Now clear this if it has been defined, but only do so if it isn't
5337 a subprogram or parameter. We could refine this, but it isn't
5338 worth it. If this is statically allocated, it is supposed to
5339 hang around out of cope. */
5340 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5341 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5343 save_gnu_tree (gnat_entity, NULL_TREE, true);
5344 save_gnu_tree (gnat_entity, error_mark_node, true);
5348 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5349 If this is a multi-dimensional array type, do this recursively.
5352 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5353 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5354 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5357 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5359 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5360 of a one-dimensional array, since the padding has the same alias set
5361 as the field type, but if it's a multi-dimensional array, we need to
5362 see the inner types. */
5363 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5364 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5365 || TYPE_IS_PADDING_P (gnu_old_type)))
5366 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5368 /* Unconstrained array types are deemed incomplete and would thus be given
5369 alias set 0. Retrieve the underlying array type. */
5370 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5372 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5373 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5375 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5377 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5378 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5379 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5380 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5384 case ALIAS_SET_COPY:
5385 /* The alias set shouldn't be copied between array types with different
5386 aliasing settings because this can break the aliasing relationship
5387 between the array type and its element type. */
5388 #ifndef ENABLE_CHECKING
5389 if (flag_strict_aliasing)
5391 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5392 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5393 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5394 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5396 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5399 case ALIAS_SET_SUBSET:
5400 case ALIAS_SET_SUPERSET:
5402 alias_set_type old_set = get_alias_set (gnu_old_type);
5403 alias_set_type new_set = get_alias_set (gnu_new_type);
5405 /* Do nothing if the alias sets conflict. This ensures that we
5406 never call record_alias_subset several times for the same pair
5407 or at all for alias set 0. */
5408 if (!alias_sets_conflict_p (old_set, new_set))
5410 if (op == ALIAS_SET_SUBSET)
5411 record_alias_subset (old_set, new_set);
5413 record_alias_subset (new_set, old_set);
5422 record_component_aliases (gnu_new_type);
5425 /* Return a TREE_LIST describing the substitutions needed to reflect
5426 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
5427 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
5428 of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE
5429 gives the tree for the discriminant and TREE_VALUES is the replacement
5430 value. They are in the form of operands to substitute_in_expr.
5431 DEFINITION is as in gnat_to_gnu_entity. */
5434 substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type,
5435 tree gnu_list, bool definition)
5437 Entity_Id gnat_discrim;
5441 gnat_type = Implementation_Base_Type (gnat_subtype);
5443 if (Has_Discriminants (gnat_type))
5444 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5445 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5446 Present (gnat_discrim);
5447 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5448 gnat_value = Next_Elmt (gnat_value))
5449 /* Ignore access discriminants. */
5450 if (!Is_Access_Type (Etype (Node (gnat_value))))
5451 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5452 elaborate_expression
5453 (Node (gnat_value), gnat_subtype,
5454 get_entity_name (gnat_discrim), definition,
5461 /* Return true if the size represented by GNU_SIZE can be handled by an
5462 allocation. If STATIC_P is true, consider only what can be done with a
5463 static allocation. */
5466 allocatable_size_p (tree gnu_size, bool static_p)
5468 HOST_WIDE_INT our_size;
5470 /* If this is not a static allocation, the only case we want to forbid
5471 is an overflowing size. That will be converted into a raise a
5474 return !(TREE_CODE (gnu_size) == INTEGER_CST
5475 && TREE_OVERFLOW (gnu_size));
5477 /* Otherwise, we need to deal with both variable sizes and constant
5478 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5479 since assemblers may not like very large sizes. */
5480 if (!host_integerp (gnu_size, 1))
5483 our_size = tree_low_cst (gnu_size, 1);
5484 return (int) our_size == our_size;
5487 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5488 NAME, ARGS and ERROR_POINT. */
5491 prepend_one_attribute_to (struct attrib ** attr_list,
5492 enum attr_type attr_type,
5495 Node_Id attr_error_point)
5497 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5499 attr->type = attr_type;
5500 attr->name = attr_name;
5501 attr->args = attr_args;
5502 attr->error_point = attr_error_point;
5504 attr->next = *attr_list;
5508 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5511 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5515 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5516 gnat_temp = Next_Rep_Item (gnat_temp))
5517 if (Nkind (gnat_temp) == N_Pragma)
5519 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5520 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5521 enum attr_type etype;
5523 if (Present (gnat_assoc) && Present (First (gnat_assoc))
5524 && Present (Next (First (gnat_assoc)))
5525 && (Nkind (Expression (Next (First (gnat_assoc))))
5526 == N_String_Literal))
5528 gnu_arg0 = get_identifier (TREE_STRING_POINTER
5531 (First (gnat_assoc))))));
5532 if (Present (Next (Next (First (gnat_assoc))))
5533 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
5534 == N_String_Literal))
5535 gnu_arg1 = get_identifier (TREE_STRING_POINTER
5539 (First (gnat_assoc)))))));
5542 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5544 case Pragma_Machine_Attribute:
5545 etype = ATTR_MACHINE_ATTRIBUTE;
5548 case Pragma_Linker_Alias:
5549 etype = ATTR_LINK_ALIAS;
5552 case Pragma_Linker_Section:
5553 etype = ATTR_LINK_SECTION;
5556 case Pragma_Linker_Constructor:
5557 etype = ATTR_LINK_CONSTRUCTOR;
5560 case Pragma_Linker_Destructor:
5561 etype = ATTR_LINK_DESTRUCTOR;
5564 case Pragma_Weak_External:
5565 etype = ATTR_WEAK_EXTERNAL;
5568 case Pragma_Thread_Local_Storage:
5569 etype = ATTR_THREAD_LOCAL_STORAGE;
5577 /* Prepend to the list now. Make a list of the argument we might
5578 have, as GCC expects it. */
5579 prepend_one_attribute_to
5582 (gnu_arg1 != NULL_TREE)
5583 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5584 Present (Next (First (gnat_assoc)))
5585 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5589 /* Called when we need to protect a variable object using a save_expr. */
5592 maybe_variable (tree gnu_operand)
5594 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
5595 || TREE_CODE (gnu_operand) == SAVE_EXPR
5596 || TREE_CODE (gnu_operand) == NULL_EXPR)
5599 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5601 tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF,
5602 TREE_TYPE (gnu_operand),
5603 variable_size (TREE_OPERAND (gnu_operand, 0)));
5605 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5606 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5610 return variable_size (gnu_operand);
5613 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5614 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5615 return the GCC tree to use for that expression. GNU_NAME is the
5616 qualification to use if an external name is appropriate and DEFINITION is
5617 true if this is a definition of GNAT_ENTITY. If NEED_VALUE is true, we
5618 need a result. Otherwise, we are just elaborating this for side-effects.
5619 If NEED_DEBUG is true we need the symbol for debugging purposes even if it
5620 isn't needed for code generation. */
5623 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity,
5624 tree gnu_name, bool definition, bool need_value,
5629 /* If we already elaborated this expression (e.g., it was involved
5630 in the definition of a private type), use the old value. */
5631 if (present_gnu_tree (gnat_expr))
5632 return get_gnu_tree (gnat_expr);
5634 /* If we don't need a value and this is static or a discriminant, we
5635 don't need to do anything. */
5636 else if (!need_value
5637 && (Is_OK_Static_Expression (gnat_expr)
5638 || (Nkind (gnat_expr) == N_Identifier
5639 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5642 /* Otherwise, convert this tree to its GCC equivalent. */
5644 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
5645 gnu_name, definition, need_debug);
5647 /* Save the expression in case we try to elaborate this entity again. Since
5648 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5649 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5650 save_gnu_tree (gnat_expr, gnu_expr, true);
5652 return need_value ? gnu_expr : error_mark_node;
5655 /* Similar, but take a GNU expression. */
5658 elaborate_expression_1 (Node_Id gnat_expr, Entity_Id gnat_entity,
5659 tree gnu_expr, tree gnu_name, bool definition,
5662 tree gnu_decl = NULL_TREE;
5663 /* Skip any conversions and simple arithmetics to see if the expression
5664 is a read-only variable.
5665 ??? This really should remain read-only, but we have to think about
5666 the typing of the tree here. */
5668 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5669 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5672 /* In most cases, we won't see a naked FIELD_DECL here because a
5673 discriminant reference will have been replaced with a COMPONENT_REF
5674 when the type is being elaborated. However, there are some cases
5675 involving child types where we will. So convert it to a COMPONENT_REF
5676 here. We have to hope it will be at the highest level of the
5677 expression in these cases. */
5678 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5679 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5680 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5681 gnu_expr, NULL_TREE);
5683 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5684 that is read-only, make a variable that is initialized to contain the
5685 bound when the package containing the definition is elaborated. If
5686 this entity is defined at top level and a bound or discriminant value
5687 isn't a constant or a reference to a discriminant, replace the bound
5688 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5689 rely here on the fact that an expression cannot contain both the
5690 discriminant and some other variable. */
5692 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5693 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5694 && (TREE_READONLY (gnu_inner_expr)
5695 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5696 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5698 /* If this is a static expression or contains a discriminant, we don't
5699 need the variable for debugging (and can't elaborate anyway if a
5702 && (Is_OK_Static_Expression (gnat_expr)
5703 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
5706 /* Now create the variable if we need it. */
5707 if (need_debug || (expr_variable && expr_global))
5709 = create_var_decl (create_concat_name (gnat_entity,
5710 IDENTIFIER_POINTER (gnu_name)),
5711 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5712 !need_debug, Is_Public (gnat_entity),
5713 !definition, false, NULL, gnat_entity);
5715 /* We only need to use this variable if we are in global context since GCC
5716 can do the right thing in the local case. */
5717 if (expr_global && expr_variable)
5719 else if (!expr_variable)
5722 return maybe_variable (gnu_expr);
5725 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5726 starting bit position so that it is aligned to ALIGN bits, and leaving at
5727 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5728 record is guaranteed to get. */
5731 make_aligning_type (tree type, unsigned int align, tree size,
5732 unsigned int base_align, int room)
5734 /* We will be crafting a record type with one field at a position set to be
5735 the next multiple of ALIGN past record'address + room bytes. We use a
5736 record placeholder to express record'address. */
5738 tree record_type = make_node (RECORD_TYPE);
5739 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5742 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5744 /* The diagram below summarizes the shape of what we manipulate:
5746 <--------- pos ---------->
5747 { +------------+-------------+-----------------+
5748 record =>{ |############| ... | field (type) |
5749 { +------------+-------------+-----------------+
5750 |<-- room -->|<- voffset ->|<---- size ----->|
5753 record_addr vblock_addr
5755 Every length is in sizetype bytes there, except "pos" which has to be
5756 set as a bit position in the GCC tree for the record. */
5758 tree room_st = size_int (room);
5759 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5760 tree voffset_st, pos, field;
5762 tree name = TYPE_NAME (type);
5764 if (TREE_CODE (name) == TYPE_DECL)
5765 name = DECL_NAME (name);
5767 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5769 /* Compute VOFFSET and then POS. The next byte position multiple of some
5770 alignment after some address is obtained by "and"ing the alignment minus
5771 1 with the two's complement of the address. */
5773 voffset_st = size_binop (BIT_AND_EXPR,
5774 size_diffop (size_zero_node, vblock_addr_st),
5775 ssize_int ((align / BITS_PER_UNIT) - 1));
5777 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5779 pos = size_binop (MULT_EXPR,
5780 convert (bitsizetype,
5781 size_binop (PLUS_EXPR, room_st, voffset_st)),
5784 /* Craft the GCC record representation. We exceptionally do everything
5785 manually here because 1) our generic circuitry is not quite ready to
5786 handle the complex position/size expressions we are setting up, 2) we
5787 have a strong simplifying factor at hand: we know the maximum possible
5788 value of voffset, and 3) we have to set/reset at least the sizes in
5789 accordance with this maximum value anyway, as we need them to convey
5790 what should be "alloc"ated for this type.
5792 Use -1 as the 'addressable' indication for the field to prevent the
5793 creation of a bitfield. We don't need one, it would have damaging
5794 consequences on the alignment computation, and create_field_decl would
5795 make one without this special argument, for instance because of the
5796 complex position expression. */
5798 field = create_field_decl (get_identifier ("F"), type, record_type,
5800 TYPE_FIELDS (record_type) = field;
5802 TYPE_ALIGN (record_type) = base_align;
5803 TYPE_USER_ALIGN (record_type) = 1;
5805 TYPE_SIZE (record_type)
5806 = size_binop (PLUS_EXPR,
5807 size_binop (MULT_EXPR, convert (bitsizetype, size),
5809 bitsize_int (align + room * BITS_PER_UNIT));
5810 TYPE_SIZE_UNIT (record_type)
5811 = size_binop (PLUS_EXPR, size,
5812 size_int (room + align / BITS_PER_UNIT));
5814 SET_TYPE_MODE (record_type, BLKmode);
5816 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5820 /* Return the result of rounding T up to ALIGN. */
5822 static inline unsigned HOST_WIDE_INT
5823 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5831 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5832 as the field type of a packed record if IN_RECORD is true, or as the
5833 component type of a packed array if IN_RECORD is false. See if we can
5834 rewrite it either as a type that has a non-BLKmode, which we can pack
5835 tighter in the packed record case, or as a smaller type. If so, return
5836 the new type. If not, return the original type. */
5839 make_packable_type (tree type, bool in_record)
5841 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5842 unsigned HOST_WIDE_INT new_size;
5843 tree new_type, old_field, field_list = NULL_TREE;
5845 /* No point in doing anything if the size is zero. */
5849 new_type = make_node (TREE_CODE (type));
5851 /* Copy the name and flags from the old type to that of the new.
5852 Note that we rely on the pointer equality created here for
5853 TYPE_NAME to look through conversions in various places. */
5854 TYPE_NAME (new_type) = TYPE_NAME (type);
5855 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5856 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5857 if (TREE_CODE (type) == RECORD_TYPE)
5858 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5860 /* If we are in a record and have a small size, set the alignment to
5861 try for an integral mode. Otherwise set it to try for a smaller
5862 type with BLKmode. */
5863 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5865 TYPE_ALIGN (new_type) = ceil_alignment (size);
5866 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5870 unsigned HOST_WIDE_INT align;
5872 /* Do not try to shrink the size if the RM size is not constant. */
5873 if (TYPE_CONTAINS_TEMPLATE_P (type)
5874 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5877 /* Round the RM size up to a unit boundary to get the minimal size
5878 for a BLKmode record. Give up if it's already the size. */
5879 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5880 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5881 if (new_size == size)
5884 align = new_size & -new_size;
5885 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5888 TYPE_USER_ALIGN (new_type) = 1;
5890 /* Now copy the fields, keeping the position and size as we don't want
5891 to change the layout by propagating the packedness downwards. */
5892 for (old_field = TYPE_FIELDS (type); old_field;
5893 old_field = TREE_CHAIN (old_field))
5895 tree new_field_type = TREE_TYPE (old_field);
5896 tree new_field, new_size;
5898 if ((TREE_CODE (new_field_type) == RECORD_TYPE
5899 || TREE_CODE (new_field_type) == UNION_TYPE
5900 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5901 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5902 && host_integerp (TYPE_SIZE (new_field_type), 1))
5903 new_field_type = make_packable_type (new_field_type, true);
5905 /* However, for the last field in a not already packed record type
5906 that is of an aggregate type, we need to use the RM size in the
5907 packable version of the record type, see finish_record_type. */
5908 if (!TREE_CHAIN (old_field)
5909 && !TYPE_PACKED (type)
5910 && (TREE_CODE (new_field_type) == RECORD_TYPE
5911 || TREE_CODE (new_field_type) == UNION_TYPE
5912 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5913 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5914 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5915 && TYPE_ADA_SIZE (new_field_type))
5916 new_size = TYPE_ADA_SIZE (new_field_type);
5918 new_size = DECL_SIZE (old_field);
5920 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5921 new_type, TYPE_PACKED (type), new_size,
5922 bit_position (old_field),
5923 !DECL_NONADDRESSABLE_P (old_field));
5925 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
5926 SET_DECL_ORIGINAL_FIELD
5927 (new_field, (DECL_ORIGINAL_FIELD (old_field)
5928 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
5930 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
5931 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
5933 TREE_CHAIN (new_field) = field_list;
5934 field_list = new_field;
5937 finish_record_type (new_type, nreverse (field_list), 2, true);
5938 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
5940 /* If this is a padding record, we never want to make the size smaller
5941 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
5942 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5943 || TREE_CODE (type) == QUAL_UNION_TYPE)
5945 TYPE_SIZE (new_type) = TYPE_SIZE (type);
5946 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
5950 TYPE_SIZE (new_type) = bitsize_int (new_size);
5951 TYPE_SIZE_UNIT (new_type)
5952 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
5955 if (!TYPE_CONTAINS_TEMPLATE_P (type))
5956 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
5958 compute_record_mode (new_type);
5960 /* Try harder to get a packable type if necessary, for example
5961 in case the record itself contains a BLKmode field. */
5962 if (in_record && TYPE_MODE (new_type) == BLKmode)
5963 SET_TYPE_MODE (new_type,
5964 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
5966 /* If neither the mode nor the size has shrunk, return the old type. */
5967 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
5973 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
5974 if needed. We have already verified that SIZE and TYPE are large enough.
5976 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
5979 IS_USER_TYPE is true if we must complete the original type.
5981 DEFINITION is true if this type is being defined.
5983 SAME_RM_SIZE is true if the RM size of the resulting type is to be set
5984 to SIZE too; otherwise, it's set to the RM size of the original type. */
5987 maybe_pad_type (tree type, tree size, unsigned int align,
5988 Entity_Id gnat_entity, const char *name_trailer,
5989 bool is_user_type, bool definition, bool same_rm_size)
5991 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
5992 tree orig_size = TYPE_SIZE (type);
5993 unsigned int orig_align = align;
5996 /* If TYPE is a padded type, see if it agrees with any size and alignment
5997 we were given. If so, return the original type. Otherwise, strip
5998 off the padding, since we will either be returning the inner type
5999 or repadding it. If no size or alignment is specified, use that of
6000 the original padded type. */
6001 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
6004 || operand_equal_p (round_up (size,
6005 MAX (align, TYPE_ALIGN (type))),
6006 round_up (TYPE_SIZE (type),
6007 MAX (align, TYPE_ALIGN (type))),
6009 && (align == 0 || align == TYPE_ALIGN (type)))
6013 size = TYPE_SIZE (type);
6015 align = TYPE_ALIGN (type);
6017 type = TREE_TYPE (TYPE_FIELDS (type));
6018 orig_size = TYPE_SIZE (type);
6021 /* If the size is either not being changed or is being made smaller (which
6022 is not done here and is only valid for bitfields anyway), show the size
6023 isn't changing. Likewise, clear the alignment if it isn't being
6024 changed. Then return if we aren't doing anything. */
6026 && (operand_equal_p (size, orig_size, 0)
6027 || (TREE_CODE (orig_size) == INTEGER_CST
6028 && tree_int_cst_lt (size, orig_size))))
6031 if (align == TYPE_ALIGN (type))
6034 if (align == 0 && !size)
6037 /* If requested, complete the original type and give it a name. */
6039 create_type_decl (get_entity_name (gnat_entity), type,
6040 NULL, !Comes_From_Source (gnat_entity),
6042 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6043 && DECL_IGNORED_P (TYPE_NAME (type))),
6046 /* We used to modify the record in place in some cases, but that could
6047 generate incorrect debugging information. So make a new record
6049 record = make_node (RECORD_TYPE);
6050 TYPE_IS_PADDING_P (record) = 1;
6052 if (Present (gnat_entity))
6053 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
6055 TYPE_VOLATILE (record)
6056 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6058 TYPE_ALIGN (record) = align;
6060 TYPE_USER_ALIGN (record) = align;
6062 TYPE_SIZE (record) = size ? size : orig_size;
6063 TYPE_SIZE_UNIT (record)
6064 = convert (sizetype,
6065 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6066 bitsize_unit_node));
6068 /* If we are changing the alignment and the input type is a record with
6069 BLKmode and a small constant size, try to make a form that has an
6070 integral mode. This might allow the padding record to also have an
6071 integral mode, which will be much more efficient. There is no point
6072 in doing so if a size is specified unless it is also a small constant
6073 size and it is incorrect to do so if we cannot guarantee that the mode
6074 will be naturally aligned since the field must always be addressable.
6076 ??? This might not always be a win when done for a stand-alone object:
6077 since the nominal and the effective type of the object will now have
6078 different modes, a VIEW_CONVERT_EXPR will be required for converting
6079 between them and it might be hard to overcome afterwards, including
6080 at the RTL level when the stand-alone object is accessed as a whole. */
6082 && TREE_CODE (type) == RECORD_TYPE
6083 && TYPE_MODE (type) == BLKmode
6084 && TREE_CODE (orig_size) == INTEGER_CST
6085 && !TREE_OVERFLOW (orig_size)
6086 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6088 || (TREE_CODE (size) == INTEGER_CST
6089 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6091 tree packable_type = make_packable_type (type, true);
6092 if (TYPE_MODE (packable_type) != BLKmode
6093 && align >= TYPE_ALIGN (packable_type))
6094 type = packable_type;
6097 /* Now create the field with the original size. */
6098 field = create_field_decl (get_identifier ("F"), type, record, 0,
6099 orig_size, bitsize_zero_node, 1);
6100 DECL_INTERNAL_P (field) = 1;
6102 /* Do not finalize it until after the auxiliary record is built. */
6103 finish_record_type (record, field, 1, true);
6105 /* Set the same size for its RM size if requested; otherwise reuse
6106 the RM size of the original type. */
6107 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6109 /* Unless debugging information isn't being written for the input type,
6110 write a record that shows what we are a subtype of and also make a
6111 variable that indicates our size, if still variable. */
6112 if (TYPE_NAME (record)
6113 && AGGREGATE_TYPE_P (type)
6114 && TREE_CODE (orig_size) != INTEGER_CST
6115 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6116 && DECL_IGNORED_P (TYPE_NAME (type))))
6118 tree marker = make_node (RECORD_TYPE);
6119 tree name = TYPE_NAME (record);
6120 tree orig_name = TYPE_NAME (type);
6122 if (TREE_CODE (name) == TYPE_DECL)
6123 name = DECL_NAME (name);
6125 if (TREE_CODE (orig_name) == TYPE_DECL)
6126 orig_name = DECL_NAME (orig_name);
6128 TYPE_NAME (marker) = concat_name (name, "XVS");
6129 finish_record_type (marker,
6130 create_field_decl (orig_name, integer_type_node,
6131 marker, 0, NULL_TREE, NULL_TREE,
6135 add_parallel_type (TYPE_STUB_DECL (record), marker);
6137 if (size && TREE_CODE (size) != INTEGER_CST && definition)
6138 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6139 TYPE_SIZE_UNIT (record), false, false, false,
6140 false, NULL, gnat_entity);
6143 rest_of_record_type_compilation (record);
6145 /* If the size was widened explicitly, maybe give a warning. Take the
6146 original size as the maximum size of the input if there was an
6147 unconstrained record involved and round it up to the specified alignment,
6148 if one was specified. */
6149 if (CONTAINS_PLACEHOLDER_P (orig_size))
6150 orig_size = max_size (orig_size, true);
6153 orig_size = round_up (orig_size, align);
6155 if (size && Present (gnat_entity)
6156 && !operand_equal_p (size, orig_size, 0)
6157 && !(TREE_CODE (size) == INTEGER_CST
6158 && TREE_CODE (orig_size) == INTEGER_CST
6159 && tree_int_cst_lt (size, orig_size)))
6161 Node_Id gnat_error_node = Empty;
6163 if (Is_Packed_Array_Type (gnat_entity))
6164 gnat_entity = Original_Array_Type (gnat_entity);
6166 if ((Ekind (gnat_entity) == E_Component
6167 || Ekind (gnat_entity) == E_Discriminant)
6168 && Present (Component_Clause (gnat_entity)))
6169 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6170 else if (Present (Size_Clause (gnat_entity)))
6171 gnat_error_node = Expression (Size_Clause (gnat_entity));
6173 /* Generate message only for entities that come from source, since
6174 if we have an entity created by expansion, the message will be
6175 generated for some other corresponding source entity. */
6176 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
6177 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
6179 size_diffop (size, orig_size));
6181 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
6182 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6183 gnat_entity, gnat_entity,
6184 size_diffop (size, orig_size));
6190 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6191 the value passed against the list of choices. */
6194 choices_to_gnu (tree operand, Node_Id choices)
6198 tree result = integer_zero_node;
6199 tree this_test, low = 0, high = 0, single = 0;
6201 for (choice = First (choices); Present (choice); choice = Next (choice))
6203 switch (Nkind (choice))
6206 low = gnat_to_gnu (Low_Bound (choice));
6207 high = gnat_to_gnu (High_Bound (choice));
6209 /* There's no good type to use here, so we might as well use
6210 integer_type_node. */
6212 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6213 build_binary_op (GE_EXPR, integer_type_node,
6215 build_binary_op (LE_EXPR, integer_type_node,
6220 case N_Subtype_Indication:
6221 gnat_temp = Range_Expression (Constraint (choice));
6222 low = gnat_to_gnu (Low_Bound (gnat_temp));
6223 high = gnat_to_gnu (High_Bound (gnat_temp));
6226 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6227 build_binary_op (GE_EXPR, integer_type_node,
6229 build_binary_op (LE_EXPR, integer_type_node,
6234 case N_Expanded_Name:
6235 /* This represents either a subtype range, an enumeration
6236 literal, or a constant Ekind says which. If an enumeration
6237 literal or constant, fall through to the next case. */
6238 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6239 && Ekind (Entity (choice)) != E_Constant)
6241 tree type = gnat_to_gnu_type (Entity (choice));
6243 low = TYPE_MIN_VALUE (type);
6244 high = TYPE_MAX_VALUE (type);
6247 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6248 build_binary_op (GE_EXPR, integer_type_node,
6250 build_binary_op (LE_EXPR, integer_type_node,
6255 /* ... fall through ... */
6257 case N_Character_Literal:
6258 case N_Integer_Literal:
6259 single = gnat_to_gnu (choice);
6260 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6264 case N_Others_Choice:
6265 this_test = integer_one_node;
6272 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6279 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6280 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6283 adjust_packed (tree field_type, tree record_type, int packed)
6285 /* If the field contains an item of variable size, we cannot pack it
6286 because we cannot create temporaries of non-fixed size in case
6287 we need to take the address of the field. See addressable_p and
6288 the notes on the addressability issues for further details. */
6289 if (is_variable_size (field_type))
6292 /* If the alignment of the record is specified and the field type
6293 is over-aligned, request Storage_Unit alignment for the field. */
6296 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6305 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6306 placed in GNU_RECORD_TYPE.
6308 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6309 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6310 record has a specified alignment.
6312 DEFINITION is true if this field is for a record being defined. */
6315 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6318 tree gnu_field_id = get_entity_name (gnat_field);
6319 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6320 tree gnu_field, gnu_size, gnu_pos;
6321 bool needs_strict_alignment
6322 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6323 || Treat_As_Volatile (gnat_field));
6325 /* If this field requires strict alignment, we cannot pack it because
6326 it would very likely be under-aligned in the record. */
6327 if (needs_strict_alignment)
6330 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6332 /* If a size is specified, use it. Otherwise, if the record type is packed,
6333 use the official RM size. See "Handling of Type'Size Values" in Einfo
6334 for further details. */
6335 if (Known_Static_Esize (gnat_field))
6336 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6337 gnat_field, FIELD_DECL, false, true);
6338 else if (packed == 1)
6339 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6340 gnat_field, FIELD_DECL, false, true);
6342 gnu_size = NULL_TREE;
6344 /* If we have a specified size that's smaller than that of the field type,
6345 or a position is specified, and the field type is a record, see if we can
6346 get either an integral mode form of the type or a smaller form. If we
6347 can, show a size was specified for the field if there wasn't one already,
6348 so we know to make this a bitfield and avoid making things wider.
6350 Doing this is first useful if the record is packed because we may then
6351 place the field at a non-byte-aligned position and so achieve tighter
6354 This is in addition *required* if the field shares a byte with another
6355 field and the front-end lets the back-end handle the references, because
6356 GCC does not handle BLKmode bitfields properly.
6358 We avoid the transformation if it is not required or potentially useful,
6359 as it might entail an increase of the field's alignment and have ripple
6360 effects on the outer record type. A typical case is a field known to be
6361 byte aligned and not to share a byte with another field.
6363 Besides, we don't even look the possibility of a transformation in cases
6364 known to be in error already, for instance when an invalid size results
6365 from a component clause. */
6367 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6368 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
6369 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6372 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6373 || Present (Component_Clause (gnat_field))))))
6375 /* See what the alternate type and size would be. */
6376 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6378 bool has_byte_aligned_clause
6379 = Present (Component_Clause (gnat_field))
6380 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6381 % BITS_PER_UNIT == 0);
6383 /* Compute whether we should avoid the substitution. */
6385 /* There is no point substituting if there is no change... */
6386 = (gnu_packable_type == gnu_field_type)
6387 /* ... nor when the field is known to be byte aligned and not to
6388 share a byte with another field. */
6389 || (has_byte_aligned_clause
6390 && value_factor_p (gnu_size, BITS_PER_UNIT))
6391 /* The size of an aliased field must be an exact multiple of the
6392 type's alignment, which the substitution might increase. Reject
6393 substitutions that would so invalidate a component clause when the
6394 specified position is byte aligned, as the change would have no
6395 real benefit from the packing standpoint anyway. */
6396 || (Is_Aliased (gnat_field)
6397 && has_byte_aligned_clause
6398 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6400 /* Substitute unless told otherwise. */
6403 gnu_field_type = gnu_packable_type;
6406 gnu_size = rm_size (gnu_field_type);
6410 /* If we are packing the record and the field is BLKmode, round the
6411 size up to a byte boundary. */
6412 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6413 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6415 if (Present (Component_Clause (gnat_field)))
6417 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6418 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6419 gnat_field, FIELD_DECL, false, true);
6421 /* Ensure the position does not overlap with the parent subtype,
6423 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6426 = gnat_to_gnu_type (Parent_Subtype
6427 (Underlying_Type (Scope (gnat_field))));
6429 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6430 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6433 ("offset of& must be beyond parent{, minimum allowed is ^}",
6434 First_Bit (Component_Clause (gnat_field)), gnat_field,
6435 TYPE_SIZE_UNIT (gnu_parent));
6439 /* If this field needs strict alignment, ensure the record is
6440 sufficiently aligned and that that position and size are
6441 consistent with the alignment. */
6442 if (needs_strict_alignment)
6444 TYPE_ALIGN (gnu_record_type)
6445 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6448 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6450 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6452 ("atomic field& must be natural size of type{ (^)}",
6453 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6454 TYPE_SIZE (gnu_field_type));
6456 else if (Is_Aliased (gnat_field))
6458 ("size of aliased field& must be ^ bits",
6459 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6460 TYPE_SIZE (gnu_field_type));
6462 else if (Strict_Alignment (Etype (gnat_field)))
6464 ("size of & with aliased or tagged components not ^ bits",
6465 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6466 TYPE_SIZE (gnu_field_type));
6468 gnu_size = NULL_TREE;
6471 if (!integer_zerop (size_binop
6472 (TRUNC_MOD_EXPR, gnu_pos,
6473 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6475 if (Is_Aliased (gnat_field))
6477 ("position of aliased field& must be multiple of ^ bits",
6478 First_Bit (Component_Clause (gnat_field)), gnat_field,
6479 TYPE_ALIGN (gnu_field_type));
6481 else if (Treat_As_Volatile (gnat_field))
6483 ("position of volatile field& must be multiple of ^ bits",
6484 First_Bit (Component_Clause (gnat_field)), gnat_field,
6485 TYPE_ALIGN (gnu_field_type));
6487 else if (Strict_Alignment (Etype (gnat_field)))
6489 ("position of & with aliased or tagged components not multiple of ^ bits",
6490 First_Bit (Component_Clause (gnat_field)), gnat_field,
6491 TYPE_ALIGN (gnu_field_type));
6496 gnu_pos = NULL_TREE;
6500 if (Is_Atomic (gnat_field))
6501 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6504 /* If the record has rep clauses and this is the tag field, make a rep
6505 clause for it as well. */
6506 else if (Has_Specified_Layout (Scope (gnat_field))
6507 && Chars (gnat_field) == Name_uTag)
6509 gnu_pos = bitsize_zero_node;
6510 gnu_size = TYPE_SIZE (gnu_field_type);
6514 gnu_pos = NULL_TREE;
6516 /* We need to make the size the maximum for the type if it is
6517 self-referential and an unconstrained type. In that case, we can't
6518 pack the field since we can't make a copy to align it. */
6519 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6521 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6522 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6524 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6528 /* If a size is specified, adjust the field's type to it. */
6531 /* If the field's type is justified modular, we would need to remove
6532 the wrapper to (better) meet the layout requirements. However we
6533 can do so only if the field is not aliased to preserve the unique
6534 layout and if the prescribed size is not greater than that of the
6535 packed array to preserve the justification. */
6536 if (!needs_strict_alignment
6537 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6538 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6539 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6541 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6544 = make_type_from_size (gnu_field_type, gnu_size,
6545 Has_Biased_Representation (gnat_field));
6546 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6547 "PAD", false, definition, true);
6550 /* Otherwise (or if there was an error), don't specify a position. */
6552 gnu_pos = NULL_TREE;
6554 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6555 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6557 /* Now create the decl for the field. */
6558 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6559 packed, gnu_size, gnu_pos,
6560 Is_Aliased (gnat_field));
6561 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6562 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6564 if (Ekind (gnat_field) == E_Discriminant)
6565 DECL_DISCRIMINANT_NUMBER (gnu_field)
6566 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6571 /* Return true if TYPE is a type with variable size, a padding type with a
6572 field of variable size or is a record that has a field such a field. */
6575 is_variable_size (tree type)
6579 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6582 if (TREE_CODE (type) == RECORD_TYPE
6583 && TYPE_IS_PADDING_P (type)
6584 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6587 if (TREE_CODE (type) != RECORD_TYPE
6588 && TREE_CODE (type) != UNION_TYPE
6589 && TREE_CODE (type) != QUAL_UNION_TYPE)
6592 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6593 if (is_variable_size (TREE_TYPE (field)))
6599 /* qsort comparer for the bit positions of two record components. */
6602 compare_field_bitpos (const PTR rt1, const PTR rt2)
6604 const_tree const field1 = * (const_tree const *) rt1;
6605 const_tree const field2 = * (const_tree const *) rt2;
6607 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6609 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6612 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
6613 of GCC trees for fields that are in the record and have already been
6614 processed. When called from gnat_to_gnu_entity during the processing of a
6615 record type definition, the GCC nodes for the discriminants will be on
6616 the chain. The other calls to this function are recursive calls from
6617 itself for the Component_List of a variant and the chain is empty.
6619 PACKED is 1 if this is for a packed record, -1 if this is for a record
6620 with Component_Alignment of Storage_Unit, -2 if this is for a record
6621 with a specified alignment.
6623 DEFINITION is true if we are defining this record.
6625 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6626 with a rep clause is to be added. If it is nonzero, that is all that
6627 should be done with such fields.
6629 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6630 laying out the record. This means the alignment only serves to force fields
6631 to be bitfields, but not require the record to be that aligned. This is
6634 ALL_REP, if true, means a rep clause was found for all the fields. This
6635 simplifies the logic since we know we're not in the mixed case.
6637 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6638 modified afterwards so it will not be sent to the back-end for finalization.
6640 UNCHECKED_UNION, if true, means that we are building a type for a record
6641 with a Pragma Unchecked_Union.
6643 The processing of the component list fills in the chain with all of the
6644 fields of the record and then the record type is finished. */
6647 components_to_record (tree gnu_record_type, Node_Id component_list,
6648 tree gnu_field_list, int packed, bool definition,
6649 tree *p_gnu_rep_list, bool cancel_alignment,
6650 bool all_rep, bool do_not_finalize, bool unchecked_union)
6652 Node_Id component_decl;
6653 Entity_Id gnat_field;
6654 Node_Id variant_part;
6655 tree gnu_our_rep_list = NULL_TREE;
6656 tree gnu_field, gnu_last;
6657 bool layout_with_rep = false;
6658 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6660 /* For each variable within each component declaration create a GCC field
6661 and add it to the list, skipping any pragmas in the list. */
6662 if (Present (Component_Items (component_list)))
6663 for (component_decl = First_Non_Pragma (Component_Items (component_list));
6664 Present (component_decl);
6665 component_decl = Next_Non_Pragma (component_decl))
6667 gnat_field = Defining_Entity (component_decl);
6669 if (Chars (gnat_field) == Name_uParent)
6670 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
6673 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6674 packed, definition);
6676 /* If this is the _Tag field, put it before any discriminants,
6677 instead of after them as is the case for all other fields. */
6678 if (Chars (gnat_field) == Name_uTag)
6679 gnu_field_list = chainon (gnu_field_list, gnu_field);
6682 TREE_CHAIN (gnu_field) = gnu_field_list;
6683 gnu_field_list = gnu_field;
6687 save_gnu_tree (gnat_field, gnu_field, false);
6690 /* At the end of the component list there may be a variant part. */
6691 variant_part = Variant_Part (component_list);
6693 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6694 mutually exclusive and should go in the same memory. To do this we need
6695 to treat each variant as a record whose elements are created from the
6696 component list for the variant. So here we create the records from the
6697 lists for the variants and put them all into the QUAL_UNION_TYPE.
6698 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6699 use GNU_RECORD_TYPE if there are no fields so far. */
6700 if (Present (variant_part))
6702 Node_Id gnat_discr = Name (variant_part), variant;
6703 tree gnu_discr = gnat_to_gnu (gnat_discr);
6704 tree gnu_name = TYPE_NAME (gnu_record_type);
6706 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6708 tree gnu_union_type, gnu_union_name, gnu_union_field;
6709 tree gnu_variant_list = NULL_TREE;
6711 if (TREE_CODE (gnu_name) == TYPE_DECL)
6712 gnu_name = DECL_NAME (gnu_name);
6715 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6717 /* Reuse an enclosing union if all fields are in the variant part
6718 and there is no representation clause on the record, to match
6719 the layout of C unions. There is an associated check below. */
6721 && TREE_CODE (gnu_record_type) == UNION_TYPE
6722 && !TYPE_PACKED (gnu_record_type))
6723 gnu_union_type = gnu_record_type;
6727 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6729 TYPE_NAME (gnu_union_type) = gnu_union_name;
6730 TYPE_ALIGN (gnu_union_type) = 0;
6731 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6734 for (variant = First_Non_Pragma (Variants (variant_part));
6736 variant = Next_Non_Pragma (variant))
6738 tree gnu_variant_type = make_node (RECORD_TYPE);
6739 tree gnu_inner_name;
6742 Get_Variant_Encoding (variant);
6743 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6744 TYPE_NAME (gnu_variant_type)
6745 = concat_name (gnu_union_name,
6746 IDENTIFIER_POINTER (gnu_inner_name));
6748 /* Set the alignment of the inner type in case we need to make
6749 inner objects into bitfields, but then clear it out
6750 so the record actually gets only the alignment required. */
6751 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6752 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6754 /* Similarly, if the outer record has a size specified and all fields
6755 have record rep clauses, we can propagate the size into the
6757 if (all_rep_and_size)
6759 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6760 TYPE_SIZE_UNIT (gnu_variant_type)
6761 = TYPE_SIZE_UNIT (gnu_record_type);
6764 /* Create the record type for the variant. Note that we defer
6765 finalizing it until after we are sure to actually use it. */
6766 components_to_record (gnu_variant_type, Component_List (variant),
6767 NULL_TREE, packed, definition,
6768 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6769 true, unchecked_union);
6771 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6773 Set_Present_Expr (variant, annotate_value (gnu_qual));
6775 /* If this is an Unchecked_Union and we have exactly one field,
6776 use this field directly to match the layout of C unions. */
6778 && TYPE_FIELDS (gnu_variant_type)
6779 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6780 gnu_field = TYPE_FIELDS (gnu_variant_type);
6783 /* Deal with packedness like in gnat_to_gnu_field. */
6785 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6787 /* Finalize the record type now. We used to throw away
6788 empty records but we no longer do that because we need
6789 them to generate complete debug info for the variant;
6790 otherwise, the union type definition will be lacking
6791 the fields associated with these empty variants. */
6792 rest_of_record_type_compilation (gnu_variant_type);
6794 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6795 gnu_union_type, field_packed,
6797 ? TYPE_SIZE (gnu_variant_type)
6800 ? bitsize_zero_node : 0),
6803 DECL_INTERNAL_P (gnu_field) = 1;
6805 if (!unchecked_union)
6806 DECL_QUALIFIER (gnu_field) = gnu_qual;
6809 TREE_CHAIN (gnu_field) = gnu_variant_list;
6810 gnu_variant_list = gnu_field;
6813 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
6814 if (gnu_variant_list)
6816 int union_field_packed;
6818 if (all_rep_and_size)
6820 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6821 TYPE_SIZE_UNIT (gnu_union_type)
6822 = TYPE_SIZE_UNIT (gnu_record_type);
6825 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6826 all_rep_and_size ? 1 : 0, false);
6828 /* If GNU_UNION_TYPE is our record type, it means we must have an
6829 Unchecked_Union with no fields. Verify that and, if so, just
6831 if (gnu_union_type == gnu_record_type)
6833 gcc_assert (unchecked_union
6835 && !gnu_our_rep_list);
6839 /* Deal with packedness like in gnat_to_gnu_field. */
6841 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6844 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6846 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6847 all_rep ? bitsize_zero_node : 0, 0);
6849 DECL_INTERNAL_P (gnu_union_field) = 1;
6850 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6851 gnu_field_list = gnu_union_field;
6855 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6856 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
6857 in a separate pass since we want to handle the discriminants but can't
6858 play with them until we've used them in debugging data above.
6860 ??? Note: if we then reorder them, debugging information will be wrong,
6861 but there's nothing that can be done about this at the moment. */
6862 for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; )
6864 if (DECL_FIELD_OFFSET (gnu_field))
6866 tree gnu_next = TREE_CHAIN (gnu_field);
6869 gnu_field_list = gnu_next;
6871 TREE_CHAIN (gnu_last) = gnu_next;
6873 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6874 gnu_our_rep_list = gnu_field;
6875 gnu_field = gnu_next;
6879 gnu_last = gnu_field;
6880 gnu_field = TREE_CHAIN (gnu_field);
6884 /* If we have any items in our rep'ed field list, it is not the case that all
6885 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
6886 set it and ignore the items. */
6887 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6888 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6889 else if (gnu_our_rep_list)
6891 /* Otherwise, sort the fields by bit position and put them into their
6892 own record if we have any fields without rep clauses. */
6894 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6895 int len = list_length (gnu_our_rep_list);
6896 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6899 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
6900 gnu_field = TREE_CHAIN (gnu_field), i++)
6901 gnu_arr[i] = gnu_field;
6903 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6905 /* Put the fields in the list in order of increasing position, which
6906 means we start from the end. */
6907 gnu_our_rep_list = NULL_TREE;
6908 for (i = len - 1; i >= 0; i--)
6910 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6911 gnu_our_rep_list = gnu_arr[i];
6912 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
6917 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
6918 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
6919 gnu_record_type, 0, 0, 0, 1);
6920 DECL_INTERNAL_P (gnu_field) = 1;
6921 gnu_field_list = chainon (gnu_field_list, gnu_field);
6925 layout_with_rep = true;
6926 gnu_field_list = nreverse (gnu_our_rep_list);
6930 if (cancel_alignment)
6931 TYPE_ALIGN (gnu_record_type) = 0;
6933 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
6934 layout_with_rep ? 1 : 0, do_not_finalize);
6937 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
6938 placed into an Esize, Component_Bit_Offset, or Component_Size value
6939 in the GNAT tree. */
6942 annotate_value (tree gnu_size)
6944 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
6946 Node_Ref_Or_Val ops[3], ret;
6949 struct tree_int_map **h = NULL;
6951 /* See if we've already saved the value for this node. */
6952 if (EXPR_P (gnu_size))
6954 struct tree_int_map in;
6955 if (!annotate_value_cache)
6956 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
6957 tree_int_map_eq, 0);
6958 in.base.from = gnu_size;
6959 h = (struct tree_int_map **)
6960 htab_find_slot (annotate_value_cache, &in, INSERT);
6963 return (Node_Ref_Or_Val) (*h)->to;
6966 /* If we do not return inside this switch, TCODE will be set to the
6967 code to use for a Create_Node operand and LEN (set above) will be
6968 the number of recursive calls for us to make. */
6970 switch (TREE_CODE (gnu_size))
6973 if (TREE_OVERFLOW (gnu_size))
6976 /* This may have come from a conversion from some smaller type,
6977 so ensure this is in bitsizetype. */
6978 gnu_size = convert (bitsizetype, gnu_size);
6980 /* For negative values, use NEGATE_EXPR of the supplied value. */
6981 if (tree_int_cst_sgn (gnu_size) < 0)
6983 /* The ridiculous code below is to handle the case of the largest
6984 negative integer. */
6985 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
6986 bool adjust = false;
6989 if (TREE_OVERFLOW (negative_size))
6992 = size_binop (MINUS_EXPR, bitsize_zero_node,
6993 size_binop (PLUS_EXPR, gnu_size,
6998 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
7000 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
7002 return annotate_value (temp);
7005 if (!host_integerp (gnu_size, 1))
7008 size = tree_low_cst (gnu_size, 1);
7010 /* This peculiar test is to make sure that the size fits in an int
7011 on machines where HOST_WIDE_INT is not "int". */
7012 if (tree_low_cst (gnu_size, 1) == size)
7013 return UI_From_Int (size);
7018 /* The only case we handle here is a simple discriminant reference. */
7019 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
7020 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
7021 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7022 return Create_Node (Discrim_Val,
7023 annotate_value (DECL_DISCRIMINANT_NUMBER
7024 (TREE_OPERAND (gnu_size, 1))),
7029 CASE_CONVERT: case NON_LVALUE_EXPR:
7030 return annotate_value (TREE_OPERAND (gnu_size, 0));
7032 /* Now just list the operations we handle. */
7033 case COND_EXPR: tcode = Cond_Expr; break;
7034 case PLUS_EXPR: tcode = Plus_Expr; break;
7035 case MINUS_EXPR: tcode = Minus_Expr; break;
7036 case MULT_EXPR: tcode = Mult_Expr; break;
7037 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7038 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7039 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7040 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7041 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7042 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7043 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7044 case NEGATE_EXPR: tcode = Negate_Expr; break;
7045 case MIN_EXPR: tcode = Min_Expr; break;
7046 case MAX_EXPR: tcode = Max_Expr; break;
7047 case ABS_EXPR: tcode = Abs_Expr; break;
7048 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7049 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7050 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7051 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7052 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7053 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7054 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7055 case LT_EXPR: tcode = Lt_Expr; break;
7056 case LE_EXPR: tcode = Le_Expr; break;
7057 case GT_EXPR: tcode = Gt_Expr; break;
7058 case GE_EXPR: tcode = Ge_Expr; break;
7059 case EQ_EXPR: tcode = Eq_Expr; break;
7060 case NE_EXPR: tcode = Ne_Expr; break;
7066 /* Now get each of the operands that's relevant for this code. If any
7067 cannot be expressed as a repinfo node, say we can't. */
7068 for (i = 0; i < 3; i++)
7071 for (i = 0; i < len; i++)
7073 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7074 if (ops[i] == No_Uint)
7078 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7080 /* Save the result in the cache. */
7083 *h = GGC_NEW (struct tree_int_map);
7084 (*h)->base.from = gnu_size;
7091 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
7092 GCC type, set Component_Bit_Offset and Esize to the position and size
7096 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7100 Entity_Id gnat_field;
7102 /* We operate by first making a list of all fields and their positions
7103 (we can get the sizes easily at any time) by a recursive call
7104 and then update all the sizes into the tree. */
7105 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
7106 size_zero_node, bitsize_zero_node,
7109 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
7110 gnat_field = Next_Entity (gnat_field))
7111 if ((Ekind (gnat_field) == E_Component
7112 || (Ekind (gnat_field) == E_Discriminant
7113 && !Is_Unchecked_Union (Scope (gnat_field)))))
7115 tree parent_offset = bitsize_zero_node;
7117 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
7122 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7124 /* In this mode the tag and parent components have not been
7125 generated, so we add the appropriate offset to each
7126 component. For a component appearing in the current
7127 extension, the offset is the size of the parent. */
7128 if (Is_Derived_Type (gnat_entity)
7129 && Original_Record_Component (gnat_field) == gnat_field)
7131 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7134 parent_offset = bitsize_int (POINTER_SIZE);
7137 Set_Component_Bit_Offset
7140 (size_binop (PLUS_EXPR,
7141 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
7142 TREE_VALUE (TREE_VALUE
7143 (TREE_VALUE (gnu_entry)))),
7146 Set_Esize (gnat_field,
7147 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
7149 else if (Is_Tagged_Type (gnat_entity)
7150 && Is_Derived_Type (gnat_entity))
7152 /* If there is no gnu_entry, this is an inherited component whose
7153 position is the same as in the parent type. */
7154 Set_Component_Bit_Offset
7156 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7157 Set_Esize (gnat_field,
7158 Esize (Original_Record_Component (gnat_field)));
7163 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
7164 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
7165 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
7166 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
7167 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
7168 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
7172 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
7173 tree gnu_bitpos, unsigned int offset_align)
7176 tree gnu_result = gnu_list;
7178 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
7179 gnu_field = TREE_CHAIN (gnu_field))
7181 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7182 DECL_FIELD_BIT_OFFSET (gnu_field));
7183 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7184 DECL_FIELD_OFFSET (gnu_field));
7185 unsigned int our_offset_align
7186 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7189 = tree_cons (gnu_field,
7190 tree_cons (gnu_our_offset,
7191 tree_cons (size_int (our_offset_align),
7192 gnu_our_bitpos, NULL_TREE),
7196 if (DECL_INTERNAL_P (gnu_field))
7198 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
7199 gnu_our_offset, gnu_our_bitpos,
7206 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7207 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7208 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7209 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7210 for the size of a field. COMPONENT_P is true if we are being called
7211 to process the Component_Size of GNAT_OBJECT. This is used for error
7212 message handling and to indicate to use the object size of GNU_TYPE.
7213 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7214 it means that a size of zero should be treated as an unspecified size. */
7217 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7218 enum tree_code kind, bool component_p, bool zero_ok)
7220 Node_Id gnat_error_node;
7221 tree type_size, size;
7223 if (kind == VAR_DECL
7224 /* If a type needs strict alignment, a component of this type in
7225 a packed record cannot be packed and thus uses the type size. */
7226 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7227 type_size = TYPE_SIZE (gnu_type);
7229 type_size = rm_size (gnu_type);
7231 /* Find the node to use for errors. */
7232 if ((Ekind (gnat_object) == E_Component
7233 || Ekind (gnat_object) == E_Discriminant)
7234 && Present (Component_Clause (gnat_object)))
7235 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7236 else if (Present (Size_Clause (gnat_object)))
7237 gnat_error_node = Expression (Size_Clause (gnat_object));
7239 gnat_error_node = gnat_object;
7241 /* Return 0 if no size was specified, either because Esize was not Present
7242 or the specified size was zero. */
7243 if (No (uint_size) || uint_size == No_Uint)
7246 /* Get the size as a tree. Issue an error if a size was specified but
7247 cannot be represented in sizetype. */
7248 size = UI_To_gnu (uint_size, bitsizetype);
7249 if (TREE_OVERFLOW (size))
7251 post_error_ne (component_p ? "component size of & is too large"
7252 : "size of & is too large",
7253 gnat_error_node, gnat_object);
7257 /* Ignore a negative size since that corresponds to our back-annotation.
7258 Also ignore a zero size if it is not permitted. */
7259 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7262 /* The size of objects is always a multiple of a byte. */
7263 if (kind == VAR_DECL
7264 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7267 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7268 gnat_error_node, gnat_object);
7270 post_error_ne ("size for& is not a multiple of Storage_Unit",
7271 gnat_error_node, gnat_object);
7275 /* If this is an integral type or a packed array type, the front-end has
7276 verified the size, so we need not do it here (which would entail
7277 checking against the bounds). However, if this is an aliased object,
7278 it may not be smaller than the type of the object. */
7279 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7280 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7283 /* If the object is a record that contains a template, add the size of
7284 the template to the specified size. */
7285 if (TREE_CODE (gnu_type) == RECORD_TYPE
7286 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7287 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7289 /* Modify the size of the type to be that of the maximum size if it has a
7291 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7292 type_size = max_size (type_size, true);
7294 /* If this is an access type or a fat pointer, the minimum size is that given
7295 by the smallest integral mode that's valid for pointers. */
7296 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7298 enum machine_mode p_mode;
7300 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7301 !targetm.valid_pointer_mode (p_mode);
7302 p_mode = GET_MODE_WIDER_MODE (p_mode))
7305 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7308 /* If the size of the object is a constant, the new size must not be
7310 if (TREE_CODE (type_size) != INTEGER_CST
7311 || TREE_OVERFLOW (type_size)
7312 || tree_int_cst_lt (size, type_size))
7316 ("component size for& too small{, minimum allowed is ^}",
7317 gnat_error_node, gnat_object, type_size);
7319 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7320 gnat_error_node, gnat_object, type_size);
7322 if (kind == VAR_DECL && !component_p
7323 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7324 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7325 post_error_ne_tree_2
7326 ("\\size of ^ is not a multiple of alignment (^ bits)",
7327 gnat_error_node, gnat_object, rm_size (gnu_type),
7328 TYPE_ALIGN (gnu_type));
7330 else if (INTEGRAL_TYPE_P (gnu_type))
7331 post_error_ne ("\\size would be legal if & were not aliased!",
7332 gnat_error_node, gnat_object);
7340 /* Similarly, but both validate and process a value of RM size. This
7341 routine is only called for types. */
7344 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7346 /* Only issue an error if a Value_Size clause was explicitly given.
7347 Otherwise, we'd be duplicating an error on the Size clause. */
7348 Node_Id gnat_attr_node
7349 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7350 tree old_size = rm_size (gnu_type), size;
7352 /* Do nothing if no size was specified, either because RM size was not
7353 Present or if the specified size was zero. */
7354 if (No (uint_size) || uint_size == No_Uint)
7357 /* Get the size as a tree. Issue an error if a size was specified but
7358 cannot be represented in sizetype. */
7359 size = UI_To_gnu (uint_size, bitsizetype);
7360 if (TREE_OVERFLOW (size))
7362 if (Present (gnat_attr_node))
7363 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7368 /* Ignore a negative size since that corresponds to our back-annotation.
7369 Also ignore a zero size unless a Value_Size clause exists, or a size
7370 clause exists, or this is an integer type, in which case the front-end
7371 will have always set it. */
7372 if (tree_int_cst_sgn (size) < 0
7373 || (integer_zerop (size)
7374 && No (gnat_attr_node)
7375 && !Has_Size_Clause (gnat_entity)
7376 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7379 /* If the old size is self-referential, get the maximum size. */
7380 if (CONTAINS_PLACEHOLDER_P (old_size))
7381 old_size = max_size (old_size, true);
7383 /* If the size of the object is a constant, the new size must not be
7384 smaller (the front-end checks this for scalar types). */
7385 if (TREE_CODE (old_size) != INTEGER_CST
7386 || TREE_OVERFLOW (old_size)
7387 || (AGGREGATE_TYPE_P (gnu_type) && tree_int_cst_lt (size, old_size)))
7389 if (Present (gnat_attr_node))
7391 ("Value_Size for& too small{, minimum allowed is ^}",
7392 gnat_attr_node, gnat_entity, old_size);
7396 /* Otherwise, set the RM size proper for numerical types... */
7397 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7398 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7399 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7400 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7401 TYPE_RM_SIZE (gnu_type) = size;
7403 /* ...or the Ada size for record and union types. */
7404 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7405 || TREE_CODE (gnu_type) == UNION_TYPE
7406 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7407 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7408 SET_TYPE_ADA_SIZE (gnu_type, size);
7411 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7412 If TYPE is the best type, return it. Otherwise, make a new type. We
7413 only support new integral and pointer types. FOR_BIASED is true if
7414 we are making a biased type. */
7417 make_type_from_size (tree type, tree size_tree, bool for_biased)
7419 unsigned HOST_WIDE_INT size;
7423 /* If size indicates an error, just return TYPE to avoid propagating
7424 the error. Likewise if it's too large to represent. */
7425 if (!size_tree || !host_integerp (size_tree, 1))
7428 size = tree_low_cst (size_tree, 1);
7430 switch (TREE_CODE (type))
7435 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7436 && TYPE_BIASED_REPRESENTATION_P (type));
7438 /* Only do something if the type is not a packed array type and
7439 doesn't already have the proper size. */
7440 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7441 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7444 biased_p |= for_biased;
7445 if (size > LONG_LONG_TYPE_SIZE)
7446 size = LONG_LONG_TYPE_SIZE;
7448 if (TYPE_UNSIGNED (type) || biased_p)
7449 new_type = make_unsigned_type (size);
7451 new_type = make_signed_type (size);
7452 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7453 TYPE_MIN_VALUE (new_type)
7454 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
7455 TYPE_MAX_VALUE (new_type)
7456 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
7457 /* Propagate the name to avoid creating a fake subrange type. */
7458 if (TYPE_NAME (type))
7460 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7461 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7463 TYPE_NAME (new_type) = TYPE_NAME (type);
7465 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7466 TYPE_RM_SIZE (new_type) = bitsize_int (size);
7470 /* Do something if this is a fat pointer, in which case we
7471 may need to return the thin pointer. */
7472 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7474 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7475 if (!targetm.valid_pointer_mode (p_mode))
7478 build_pointer_type_for_mode
7479 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7485 /* Only do something if this is a thin pointer, in which case we
7486 may need to return the fat pointer. */
7487 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7489 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7499 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7500 a type or object whose present alignment is ALIGN. If this alignment is
7501 valid, return it. Otherwise, give an error and return ALIGN. */
7504 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7506 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7507 unsigned int new_align;
7508 Node_Id gnat_error_node;
7510 /* Don't worry about checking alignment if alignment was not specified
7511 by the source program and we already posted an error for this entity. */
7512 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7515 /* Post the error on the alignment clause if any. */
7516 if (Present (Alignment_Clause (gnat_entity)))
7517 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7519 gnat_error_node = gnat_entity;
7521 /* Within GCC, an alignment is an integer, so we must make sure a value is
7522 specified that fits in that range. Also, there is an upper bound to
7523 alignments we can support/allow. */
7524 if (!UI_Is_In_Int_Range (alignment)
7525 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7526 post_error_ne_num ("largest supported alignment for& is ^",
7527 gnat_error_node, gnat_entity, max_allowed_alignment);
7528 else if (!(Present (Alignment_Clause (gnat_entity))
7529 && From_At_Mod (Alignment_Clause (gnat_entity)))
7530 && new_align * BITS_PER_UNIT < align)
7532 unsigned int double_align;
7533 bool is_capped_double, align_clause;
7535 /* If the default alignment of "double" or larger scalar types is
7536 specifically capped and the new alignment is above the cap, do
7537 not post an error and change the alignment only if there is an
7538 alignment clause; this makes it possible to have the associated
7539 GCC type overaligned by default for performance reasons. */
7540 if ((double_align = double_float_alignment) > 0)
7543 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7545 = is_double_float_or_array (gnat_type, &align_clause);
7547 else if ((double_align = double_scalar_alignment) > 0)
7550 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7552 = is_double_scalar_or_array (gnat_type, &align_clause);
7555 is_capped_double = align_clause = false;
7557 if (is_capped_double && new_align >= double_align)
7560 align = new_align * BITS_PER_UNIT;
7564 if (is_capped_double)
7565 align = double_align * BITS_PER_UNIT;
7567 post_error_ne_num ("alignment for& must be at least ^",
7568 gnat_error_node, gnat_entity,
7569 align / BITS_PER_UNIT);
7574 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7575 if (new_align > align)
7582 /* Return the smallest alignment not less than SIZE. */
7585 ceil_alignment (unsigned HOST_WIDE_INT size)
7587 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7590 /* Verify that OBJECT, a type or decl, is something we can implement
7591 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7592 if we require atomic components. */
7595 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7597 Node_Id gnat_error_point = gnat_entity;
7599 enum machine_mode mode;
7603 /* There are three case of what OBJECT can be. It can be a type, in which
7604 case we take the size, alignment and mode from the type. It can be a
7605 declaration that was indirect, in which case the relevant values are
7606 that of the type being pointed to, or it can be a normal declaration,
7607 in which case the values are of the decl. The code below assumes that
7608 OBJECT is either a type or a decl. */
7609 if (TYPE_P (object))
7611 mode = TYPE_MODE (object);
7612 align = TYPE_ALIGN (object);
7613 size = TYPE_SIZE (object);
7615 else if (DECL_BY_REF_P (object))
7617 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7618 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7619 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7623 mode = DECL_MODE (object);
7624 align = DECL_ALIGN (object);
7625 size = DECL_SIZE (object);
7628 /* Consider all floating-point types atomic and any types that that are
7629 represented by integers no wider than a machine word. */
7630 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7631 || ((GET_MODE_CLASS (mode) == MODE_INT
7632 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7633 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7636 /* For the moment, also allow anything that has an alignment equal
7637 to its size and which is smaller than a word. */
7638 if (size && TREE_CODE (size) == INTEGER_CST
7639 && compare_tree_int (size, align) == 0
7640 && align <= BITS_PER_WORD)
7643 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7644 gnat_node = Next_Rep_Item (gnat_node))
7646 if (!comp_p && Nkind (gnat_node) == N_Pragma
7647 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7649 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7650 else if (comp_p && Nkind (gnat_node) == N_Pragma
7651 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7652 == Pragma_Atomic_Components))
7653 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7657 post_error_ne ("atomic access to component of & cannot be guaranteed",
7658 gnat_error_point, gnat_entity);
7660 post_error_ne ("atomic access to & cannot be guaranteed",
7661 gnat_error_point, gnat_entity);
7664 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7665 have compatible signatures so that a call using one type may be safely
7666 issued if the actual target function type is the other. Return 1 if it is
7667 the case, 0 otherwise, and post errors on the incompatibilities.
7669 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7670 that calls to the subprogram will have arguments suitable for the later
7671 underlying builtin expansion. */
7674 compatible_signatures_p (tree ftype1, tree ftype2)
7676 /* As of now, we only perform very trivial tests and consider it's the
7677 programmer's responsibility to ensure the type correctness in the Ada
7678 declaration, as in the regular Import cases.
7680 Mismatches typically result in either error messages from the builtin
7681 expander, internal compiler errors, or in a real call sequence. This
7682 should be refined to issue diagnostics helping error detection and
7685 /* Almost fake test, ensuring a use of each argument. */
7686 if (ftype1 == ftype2)
7692 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
7693 type with all size expressions that contain F in a PLACEHOLDER_EXPR
7694 updated by replacing F with R.
7696 The function doesn't update the layout of the type, i.e. it assumes
7697 that the substitution is purely formal. That's why the replacement
7698 value R must itself contain a PLACEHOLDER_EXPR. */
7701 substitute_in_type (tree t, tree f, tree r)
7705 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
7707 switch (TREE_CODE (t))
7712 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7713 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7715 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7716 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7718 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7721 new = copy_type (t);
7722 TYPE_MIN_VALUE (new) = low;
7723 TYPE_MAX_VALUE (new) = high;
7724 if (TYPE_INDEX_TYPE (t))
7726 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7733 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7734 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7736 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7737 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7739 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7742 new = copy_type (t);
7743 TYPE_MIN_VALUE (new) = low;
7744 TYPE_MAX_VALUE (new) = high;
7751 new = substitute_in_type (TREE_TYPE (t), f, r);
7752 if (new == TREE_TYPE (t))
7755 return build_complex_type (new);
7761 /* These should never show up here. */
7766 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7767 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7769 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7772 new = build_array_type (component, domain);
7773 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7774 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7775 SET_TYPE_MODE (new, TYPE_MODE (t));
7776 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7777 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7778 TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t);
7779 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7780 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7786 case QUAL_UNION_TYPE:
7788 bool changed_field = false;
7791 /* Start out with no fields, make new fields, and chain them
7792 in. If we haven't actually changed the type of any field,
7793 discard everything we've done and return the old type. */
7794 new = copy_type (t);
7795 TYPE_FIELDS (new) = NULL_TREE;
7797 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7799 tree new_field = copy_node (field), new_n;
7801 new_n = substitute_in_type (TREE_TYPE (field), f, r);
7802 if (new_n != TREE_TYPE (field))
7804 TREE_TYPE (new_field) = new_n;
7805 changed_field = true;
7808 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
7809 if (new_n != DECL_FIELD_OFFSET (field))
7811 DECL_FIELD_OFFSET (new_field) = new_n;
7812 changed_field = true;
7815 /* Do the substitution inside the qualifier, if any. */
7816 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7818 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7819 if (new_n != DECL_QUALIFIER (field))
7821 DECL_QUALIFIER (new_field) = new_n;
7822 changed_field = true;
7826 DECL_CONTEXT (new_field) = new;
7827 SET_DECL_ORIGINAL_FIELD (new_field,
7828 (DECL_ORIGINAL_FIELD (field)
7829 ? DECL_ORIGINAL_FIELD (field) : field));
7831 TREE_CHAIN (new_field) = TYPE_FIELDS (new);
7832 TYPE_FIELDS (new) = new_field;
7838 TYPE_FIELDS (new) = nreverse (TYPE_FIELDS (new));
7839 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7840 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7841 SET_TYPE_ADA_SIZE (new, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
7850 /* Return the RM size of GNU_TYPE. This is the actual number of bits
7851 needed to represent the object. */
7854 rm_size (tree gnu_type)
7856 /* For integer types, this is the precision. */
7857 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7858 return TYPE_RM_SIZE (gnu_type);
7860 /* Return the RM size of the actual data plus the size of the template. */
7861 if (TREE_CODE (gnu_type) == RECORD_TYPE
7862 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7864 size_binop (PLUS_EXPR,
7865 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7866 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7868 /* For record types, we store the size explicitly. */
7869 if ((TREE_CODE (gnu_type) == RECORD_TYPE
7870 || TREE_CODE (gnu_type) == UNION_TYPE
7871 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7872 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7873 && TYPE_ADA_SIZE (gnu_type))
7874 return TYPE_ADA_SIZE (gnu_type);
7876 /* For other types, this is just the size. */
7877 return TYPE_SIZE (gnu_type);
7880 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7881 fully-qualified name, possibly with type information encoding.
7882 Otherwise, return the name. */
7885 get_entity_name (Entity_Id gnat_entity)
7887 Get_Encoded_Name (gnat_entity);
7888 return get_identifier_with_length (Name_Buffer, Name_Len);
7891 /* Return an identifier representing the external name to be used for
7892 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7893 and the specified suffix. */
7896 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7898 Entity_Kind kind = Ekind (gnat_entity);
7902 String_Template temp = {1, strlen (suffix)};
7903 Fat_Pointer fp = {suffix, &temp};
7904 Get_External_Name_With_Suffix (gnat_entity, fp);
7907 Get_External_Name (gnat_entity, 0);
7909 /* A variable using the Stdcall convention lives in a DLL. We adjust
7910 its name to use the jump table, the _imp__NAME contains the address
7911 for the NAME variable. */
7912 if ((kind == E_Variable || kind == E_Constant)
7913 && Has_Stdcall_Convention (gnat_entity))
7915 const int len = 6 + Name_Len;
7916 char *new_name = (char *) alloca (len + 1);
7917 strcpy (new_name, "_imp__");
7918 strcat (new_name, Name_Buffer);
7919 return get_identifier_with_length (new_name, len);
7922 return get_identifier_with_length (Name_Buffer, Name_Len);
7925 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
7926 string, return a new IDENTIFIER_NODE that is the concatenation of
7927 the name followed by "___" and the specified suffix. */
7930 concat_name (tree gnu_name, const char *suffix)
7932 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
7933 char *new_name = (char *) alloca (len + 1);
7934 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
7935 strcat (new_name, "___");
7936 strcat (new_name, suffix);
7937 return get_identifier_with_length (new_name, len);
7940 #include "gt-ada-decl.h"
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