1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2010, 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"
36 #include "tree-inline.h"
54 #ifndef MAX_FIXED_MODE_SIZE
55 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
58 /* Convention_Stdcall should be processed in a specific way on Windows targets
59 only. The macro below is a helper to avoid having to check for a Windows
60 specific attribute throughout this unit. */
62 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
63 #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall)
65 #define Has_Stdcall_Convention(E) (0)
68 /* Stack realignment for functions with foreign conventions is provided on a
69 per back-end basis now, as it is handled by the prologue expanders and not
70 as part of the function's body any more. It might be requested by way of a
71 dedicated function type attribute on the targets that support it.
73 We need a way to avoid setting the attribute on the targets that don't
74 support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose.
76 It is defined on targets where the circuitry is available, and indicates
77 whether the realignment is needed for 'main'. We use this to decide for
78 foreign subprograms as well.
80 It is not defined on targets where the circuitry is not implemented, and
81 we just never set the attribute in these cases.
83 Whether it is defined on all targets that would need it in theory is
84 not entirely clear. We currently trust the base GCC settings for this
87 #ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
88 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 0
93 struct incomplete *next;
98 /* These variables are used to defer recursively expanding incomplete types
99 while we are processing an array, a record or a subprogram type. */
100 static int defer_incomplete_level = 0;
101 static struct incomplete *defer_incomplete_list;
103 /* This variable is used to delay expanding From_With_Type types until the
105 static struct incomplete *defer_limited_with;
107 /* These variables are used to defer finalizing types. The element of the
108 list is the TYPE_DECL associated with the type. */
109 static int defer_finalize_level = 0;
110 static VEC (tree,heap) *defer_finalize_list;
112 /* A hash table used to cache the result of annotate_value. */
113 static GTY ((if_marked ("tree_int_map_marked_p"),
114 param_is (struct tree_int_map))) htab_t annotate_value_cache;
123 static void relate_alias_sets (tree, tree, enum alias_set_op);
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 (tree, Entity_Id, tree, bool, bool);
132 static tree make_packable_type (tree, bool);
133 static tree gnat_to_gnu_component_type (Entity_Id, bool, bool);
134 static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool,
136 static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool);
137 static bool same_discriminant_p (Entity_Id, Entity_Id);
138 static bool array_type_has_nonaliased_component (tree, Entity_Id);
139 static bool compile_time_known_address_p (Node_Id);
140 static bool cannot_be_superflat_p (Node_Id);
141 static bool constructor_address_p (tree);
142 static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
143 bool, bool, bool, bool, bool);
144 static Uint annotate_value (tree);
145 static void annotate_rep (Entity_Id, tree);
146 static tree build_position_list (tree, bool, tree, tree, unsigned int, tree);
147 static tree build_subst_list (Entity_Id, Entity_Id, bool);
148 static tree build_variant_list (tree, tree, tree);
149 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
150 static void set_rm_size (Uint, tree, Entity_Id);
151 static tree make_type_from_size (tree, tree, bool);
152 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
153 static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
154 static void check_ok_for_atomic (tree, Entity_Id, bool);
155 static int compatible_signatures_p (tree, tree);
156 static tree create_field_decl_from (tree, tree, tree, tree, tree, tree);
157 static tree get_rep_part (tree);
158 static tree get_variant_part (tree);
159 static tree create_variant_part_from (tree, tree, tree, tree, tree);
160 static void copy_and_substitute_in_size (tree, tree, tree);
161 static void rest_of_type_decl_compilation_no_defer (tree);
163 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
164 entity, return the equivalent GCC tree for that entity (a ..._DECL node)
165 and associate the ..._DECL node with the input GNAT defining identifier.
167 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
168 initial value (in GCC tree form). This is optional for a variable. For
169 a renamed entity, GNU_EXPR gives the object being renamed.
171 DEFINITION is nonzero if this call is intended for a definition. This is
172 used for separate compilation where it is necessary to know whether an
173 external declaration or a definition must be created if the GCC equivalent
174 was not created previously. The value of 1 is normally used for a nonzero
175 DEFINITION, but a value of 2 is used in special circumstances, defined in
179 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
181 /* Contains the kind of the input GNAT node. */
182 const Entity_Kind kind = Ekind (gnat_entity);
183 /* True if this is a type. */
184 const bool is_type = IN (kind, Type_Kind);
185 /* For a type, contains the equivalent GNAT node to be used in gigi. */
186 Entity_Id gnat_equiv_type = Empty;
187 /* Temporary used to walk the GNAT tree. */
189 /* Contains the GCC DECL node which is equivalent to the input GNAT node.
190 This node will be associated with the GNAT node by calling at the end
191 of the `switch' statement. */
192 tree gnu_decl = NULL_TREE;
193 /* Contains the GCC type to be used for the GCC node. */
194 tree gnu_type = NULL_TREE;
195 /* Contains the GCC size tree to be used for the GCC node. */
196 tree gnu_size = NULL_TREE;
197 /* Contains the GCC name to be used for the GCC node. */
198 tree gnu_entity_name;
199 /* True if we have already saved gnu_decl as a GNAT association. */
201 /* True if we incremented defer_incomplete_level. */
202 bool this_deferred = false;
203 /* True if we incremented force_global. */
204 bool this_global = false;
205 /* True if we should check to see if elaborated during processing. */
206 bool maybe_present = false;
207 /* True if we made GNU_DECL and its type here. */
208 bool this_made_decl = false;
209 /* True if debug info is requested for this entity. */
210 bool debug_info_p = (Needs_Debug_Info (gnat_entity)
211 || debug_info_level == DINFO_LEVEL_VERBOSE);
212 /* True if this entity is to be considered as imported. */
213 bool imported_p = (Is_Imported (gnat_entity)
214 && No (Address_Clause (gnat_entity)));
215 /* Size and alignment of the GCC node, if meaningful. */
216 unsigned int esize = 0, align = 0;
217 /* Contains the list of attributes directly attached to the entity. */
218 struct attrib *attr_list = NULL;
220 /* Since a use of an Itype is a definition, process it as such if it
221 is not in a with'ed unit. */
224 && Is_Itype (gnat_entity)
225 && !present_gnu_tree (gnat_entity)
226 && In_Extended_Main_Code_Unit (gnat_entity))
228 /* Ensure that we are in a subprogram mentioned in the Scope chain of
229 this entity, our current scope is global, or we encountered a task
230 or entry (where we can't currently accurately check scoping). */
231 if (!current_function_decl
232 || DECL_ELABORATION_PROC_P (current_function_decl))
234 process_type (gnat_entity);
235 return get_gnu_tree (gnat_entity);
238 for (gnat_temp = Scope (gnat_entity);
240 gnat_temp = Scope (gnat_temp))
242 if (Is_Type (gnat_temp))
243 gnat_temp = Underlying_Type (gnat_temp);
245 if (Ekind (gnat_temp) == E_Subprogram_Body)
247 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
249 if (IN (Ekind (gnat_temp), Subprogram_Kind)
250 && Present (Protected_Body_Subprogram (gnat_temp)))
251 gnat_temp = Protected_Body_Subprogram (gnat_temp);
253 if (Ekind (gnat_temp) == E_Entry
254 || Ekind (gnat_temp) == E_Entry_Family
255 || Ekind (gnat_temp) == E_Task_Type
256 || (IN (Ekind (gnat_temp), Subprogram_Kind)
257 && present_gnu_tree (gnat_temp)
258 && (current_function_decl
259 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
261 process_type (gnat_entity);
262 return get_gnu_tree (gnat_entity);
266 /* This abort means the Itype has an incorrect scope, i.e. that its
267 scope does not correspond to the subprogram it is declared in. */
271 /* If we've already processed this entity, return what we got last time.
272 If we are defining the node, we should not have already processed it.
273 In that case, we will abort below when we try to save a new GCC tree
274 for this object. We also need to handle the case of getting a dummy
275 type when a Full_View exists. */
276 if ((!definition || (is_type && imported_p))
277 && present_gnu_tree (gnat_entity))
279 gnu_decl = get_gnu_tree (gnat_entity);
281 if (TREE_CODE (gnu_decl) == TYPE_DECL
282 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
283 && IN (kind, Incomplete_Or_Private_Kind)
284 && Present (Full_View (gnat_entity)))
287 = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0);
288 save_gnu_tree (gnat_entity, NULL_TREE, false);
289 save_gnu_tree (gnat_entity, gnu_decl, false);
295 /* If this is a numeric or enumeral type, or an access type, a nonzero
296 Esize must be specified unless it was specified by the programmer. */
297 gcc_assert (!Unknown_Esize (gnat_entity)
298 || Has_Size_Clause (gnat_entity)
299 || (!IN (kind, Numeric_Kind)
300 && !IN (kind, Enumeration_Kind)
301 && (!IN (kind, Access_Kind)
302 || kind == E_Access_Protected_Subprogram_Type
303 || kind == E_Anonymous_Access_Protected_Subprogram_Type
304 || kind == E_Access_Subtype)));
306 /* The RM size must be specified for all discrete and fixed-point types. */
307 gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind)
308 && Unknown_RM_Size (gnat_entity)));
310 /* If we get here, it means we have not yet done anything with this entity.
311 If we are not defining it, it must be a type or an entity that is defined
312 elsewhere or externally, otherwise we should have defined it already. */
313 gcc_assert (definition
314 || type_annotate_only
316 || kind == E_Discriminant
317 || kind == E_Component
319 || (kind == E_Constant && Present (Full_View (gnat_entity)))
320 || Is_Public (gnat_entity));
322 /* Get the name of the entity and set up the line number and filename of
323 the original definition for use in any decl we make. */
324 gnu_entity_name = get_entity_name (gnat_entity);
325 Sloc_to_locus (Sloc (gnat_entity), &input_location);
327 /* For cases when we are not defining (i.e., we are referencing from
328 another compilation unit) public entities, show we are at global level
329 for the purpose of computing scopes. Don't do this for components or
330 discriminants since the relevant test is whether or not the record is
333 && kind != E_Component
334 && kind != E_Discriminant
335 && Is_Public (gnat_entity)
336 && !Is_Statically_Allocated (gnat_entity))
337 force_global++, this_global = true;
339 /* Handle any attributes directly attached to the entity. */
340 if (Has_Gigi_Rep_Item (gnat_entity))
341 prepend_attributes (gnat_entity, &attr_list);
343 /* Do some common processing for types. */
346 /* Compute the equivalent type to be used in gigi. */
347 gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
349 /* Machine_Attributes on types are expected to be propagated to
350 subtypes. The corresponding Gigi_Rep_Items are only attached
351 to the first subtype though, so we handle the propagation here. */
352 if (Base_Type (gnat_entity) != gnat_entity
353 && !Is_First_Subtype (gnat_entity)
354 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
355 prepend_attributes (First_Subtype (Base_Type (gnat_entity)),
358 /* Compute a default value for the size of the type. */
359 if (Known_Esize (gnat_entity)
360 && UI_Is_In_Int_Range (Esize (gnat_entity)))
362 unsigned int max_esize;
363 esize = UI_To_Int (Esize (gnat_entity));
365 if (IN (kind, Float_Kind))
366 max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
367 else if (IN (kind, Access_Kind))
368 max_esize = POINTER_SIZE * 2;
370 max_esize = LONG_LONG_TYPE_SIZE;
372 if (esize > max_esize)
376 esize = LONG_LONG_TYPE_SIZE;
382 /* If this is a use of a deferred constant without address clause,
383 get its full definition. */
385 && No (Address_Clause (gnat_entity))
386 && Present (Full_View (gnat_entity)))
389 = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
394 /* If we have an external constant that we are not defining, get the
395 expression that is was defined to represent. We may throw that
396 expression away later if it is not a constant. Do not retrieve the
397 expression if it is an aggregate or allocator, because in complex
398 instantiation contexts it may not be expanded */
400 && Present (Expression (Declaration_Node (gnat_entity)))
401 && !No_Initialization (Declaration_Node (gnat_entity))
402 && (Nkind (Expression (Declaration_Node (gnat_entity)))
404 && (Nkind (Expression (Declaration_Node (gnat_entity)))
406 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
408 /* Ignore deferred constant definitions without address clause since
409 they are processed fully in the front-end. If No_Initialization
410 is set, this is not a deferred constant but a constant whose value
411 is built manually. And constants that are renamings are handled
415 && No (Address_Clause (gnat_entity))
416 && !No_Initialization (Declaration_Node (gnat_entity))
417 && No (Renamed_Object (gnat_entity)))
419 gnu_decl = error_mark_node;
424 /* Ignore constant definitions already marked with the error node. See
425 the N_Object_Declaration case of gnat_to_gnu for the rationale. */
428 && present_gnu_tree (gnat_entity)
429 && get_gnu_tree (gnat_entity) == error_mark_node)
431 maybe_present = true;
438 /* We used to special case VMS exceptions here to directly map them to
439 their associated condition code. Since this code had to be masked
440 dynamically to strip off the severity bits, this caused trouble in
441 the GCC/ZCX case because the "type" pointers we store in the tables
442 have to be static. We now don't special case here anymore, and let
443 the regular processing take place, which leaves us with a regular
444 exception data object for VMS exceptions too. The condition code
445 mapping is taken care of by the front end and the bitmasking by the
452 /* The GNAT record where the component was defined. */
453 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
455 /* If the variable is an inherited record component (in the case of
456 extended record types), just return the inherited entity, which
457 must be a FIELD_DECL. Likewise for discriminants.
458 For discriminants of untagged records which have explicit
459 stored discriminants, return the entity for the corresponding
460 stored discriminant. Also use Original_Record_Component
461 if the record has a private extension. */
462 if (Present (Original_Record_Component (gnat_entity))
463 && Original_Record_Component (gnat_entity) != gnat_entity)
466 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
467 gnu_expr, definition);
472 /* If the enclosing record has explicit stored discriminants,
473 then it is an untagged record. If the Corresponding_Discriminant
474 is not empty then this must be a renamed discriminant and its
475 Original_Record_Component must point to the corresponding explicit
476 stored discriminant (i.e. we should have taken the previous
478 else if (Present (Corresponding_Discriminant (gnat_entity))
479 && Is_Tagged_Type (gnat_record))
481 /* A tagged record has no explicit stored discriminants. */
482 gcc_assert (First_Discriminant (gnat_record)
483 == First_Stored_Discriminant (gnat_record));
485 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
486 gnu_expr, definition);
491 else if (Present (CR_Discriminant (gnat_entity))
492 && type_annotate_only)
494 gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
495 gnu_expr, definition);
500 /* If the enclosing record has explicit stored discriminants, then
501 it is an untagged record. If the Corresponding_Discriminant
502 is not empty then this must be a renamed discriminant and its
503 Original_Record_Component must point to the corresponding explicit
504 stored discriminant (i.e. we should have taken the first
506 else if (Present (Corresponding_Discriminant (gnat_entity))
507 && (First_Discriminant (gnat_record)
508 != First_Stored_Discriminant (gnat_record)))
511 /* Otherwise, if we are not defining this and we have no GCC type
512 for the containing record, make one for it. Then we should
513 have made our own equivalent. */
514 else if (!definition && !present_gnu_tree (gnat_record))
516 /* ??? If this is in a record whose scope is a protected
517 type and we have an Original_Record_Component, use it.
518 This is a workaround for major problems in protected type
520 Entity_Id Scop = Scope (Scope (gnat_entity));
521 if ((Is_Protected_Type (Scop)
522 || (Is_Private_Type (Scop)
523 && Present (Full_View (Scop))
524 && Is_Protected_Type (Full_View (Scop))))
525 && Present (Original_Record_Component (gnat_entity)))
528 = gnat_to_gnu_entity (Original_Record_Component
535 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
536 gnu_decl = get_gnu_tree (gnat_entity);
542 /* Here we have no GCC type and this is a reference rather than a
543 definition. This should never happen. Most likely the cause is
544 reference before declaration in the gnat tree for gnat_entity. */
548 case E_Loop_Parameter:
549 case E_Out_Parameter:
552 /* Simple variables, loop variables, Out parameters, and exceptions. */
555 bool used_by_ref = false;
557 = ((kind == E_Constant || kind == E_Variable)
558 && Is_True_Constant (gnat_entity)
559 && !Treat_As_Volatile (gnat_entity)
560 && (((Nkind (Declaration_Node (gnat_entity))
561 == N_Object_Declaration)
562 && Present (Expression (Declaration_Node (gnat_entity))))
563 || Present (Renamed_Object (gnat_entity))));
564 bool inner_const_flag = const_flag;
565 bool static_p = Is_Statically_Allocated (gnat_entity);
566 bool mutable_p = false;
567 tree gnu_ext_name = NULL_TREE;
568 tree renamed_obj = NULL_TREE;
569 tree gnu_object_size;
571 if (Present (Renamed_Object (gnat_entity)) && !definition)
573 if (kind == E_Exception)
574 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
577 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
580 /* Get the type after elaborating the renamed object. */
581 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
583 /* For a debug renaming declaration, build a pure debug entity. */
584 if (Present (Debug_Renaming_Link (gnat_entity)))
587 gnu_decl = build_decl (input_location,
588 VAR_DECL, gnu_entity_name, gnu_type);
589 /* The (MEM (CONST (0))) pattern is prescribed by STABS. */
590 if (global_bindings_p ())
591 addr = gen_rtx_CONST (VOIDmode, const0_rtx);
593 addr = stack_pointer_rtx;
594 SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
595 gnat_pushdecl (gnu_decl, gnat_entity);
599 /* If this is a loop variable, its type should be the base type.
600 This is because the code for processing a loop determines whether
601 a normal loop end test can be done by comparing the bounds of the
602 loop against those of the base type, which is presumed to be the
603 size used for computation. But this is not correct when the size
604 of the subtype is smaller than the type. */
605 if (kind == E_Loop_Parameter)
606 gnu_type = get_base_type (gnu_type);
608 /* Reject non-renamed objects whose types are unconstrained arrays or
609 any object whose type is a dummy type or VOID_TYPE. */
611 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
612 && No (Renamed_Object (gnat_entity)))
613 || TYPE_IS_DUMMY_P (gnu_type)
614 || TREE_CODE (gnu_type) == VOID_TYPE)
616 gcc_assert (type_annotate_only);
619 return error_mark_node;
622 /* If an alignment is specified, use it if valid. Note that exceptions
623 are objects but don't have an alignment. We must do this before we
624 validate the size, since the alignment can affect the size. */
625 if (kind != E_Exception && Known_Alignment (gnat_entity))
627 gcc_assert (Present (Alignment (gnat_entity)));
628 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
629 TYPE_ALIGN (gnu_type));
630 /* No point in changing the type if there is an address clause
631 as the final type of the object will be a reference type. */
632 if (Present (Address_Clause (gnat_entity)))
636 = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
637 false, false, definition, true);
640 /* If we are defining the object, see if it has a Size value and
641 validate it if so. If we are not defining the object and a Size
642 clause applies, simply retrieve the value. We don't want to ignore
643 the clause and it is expected to have been validated already. Then
644 get the new type, if any. */
646 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
647 gnat_entity, VAR_DECL, false,
648 Has_Size_Clause (gnat_entity));
649 else if (Has_Size_Clause (gnat_entity))
650 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
655 = make_type_from_size (gnu_type, gnu_size,
656 Has_Biased_Representation (gnat_entity));
658 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
659 gnu_size = NULL_TREE;
662 /* If this object has self-referential size, it must be a record with
663 a default value. We are supposed to allocate an object of the
664 maximum size in this case unless it is a constant with an
665 initializing expression, in which case we can get the size from
666 that. Note that the resulting size may still be a variable, so
667 this may end up with an indirect allocation. */
668 if (No (Renamed_Object (gnat_entity))
669 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
671 if (gnu_expr && kind == E_Constant)
673 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
674 if (CONTAINS_PLACEHOLDER_P (size))
676 /* If the initializing expression is itself a constant,
677 despite having a nominal type with self-referential
678 size, we can get the size directly from it. */
679 if (TREE_CODE (gnu_expr) == COMPONENT_REF
681 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
682 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
683 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
684 || DECL_READONLY_ONCE_ELAB
685 (TREE_OPERAND (gnu_expr, 0))))
686 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
689 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
694 /* We may have no GNU_EXPR because No_Initialization is
695 set even though there's an Expression. */
696 else if (kind == E_Constant
697 && (Nkind (Declaration_Node (gnat_entity))
698 == N_Object_Declaration)
699 && Present (Expression (Declaration_Node (gnat_entity))))
701 = TYPE_SIZE (gnat_to_gnu_type
703 (Expression (Declaration_Node (gnat_entity)))));
706 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
711 /* If the size is zero bytes, make it one byte since some linkers have
712 trouble with zero-sized objects. If the object will have a
713 template, that will make it nonzero so don't bother. Also avoid
714 doing that for an object renaming or an object with an address
715 clause, as we would lose useful information on the view size
716 (e.g. for null array slices) and we are not allocating the object
719 && integer_zerop (gnu_size)
720 && !TREE_OVERFLOW (gnu_size))
721 || (TYPE_SIZE (gnu_type)
722 && integer_zerop (TYPE_SIZE (gnu_type))
723 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
724 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
725 || !Is_Array_Type (Etype (gnat_entity)))
726 && No (Renamed_Object (gnat_entity))
727 && No (Address_Clause (gnat_entity)))
728 gnu_size = bitsize_unit_node;
730 /* If this is an object with no specified size and alignment, and
731 if either it is atomic or we are not optimizing alignment for
732 space and it is composite and not an exception, an Out parameter
733 or a reference to another object, and the size of its type is a
734 constant, set the alignment to the smallest one which is not
735 smaller than the size, with an appropriate cap. */
736 if (!gnu_size && align == 0
737 && (Is_Atomic (gnat_entity)
738 || (!Optimize_Alignment_Space (gnat_entity)
739 && kind != E_Exception
740 && kind != E_Out_Parameter
741 && Is_Composite_Type (Etype (gnat_entity))
742 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
744 && No (Renamed_Object (gnat_entity))
745 && No (Address_Clause (gnat_entity))))
746 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
748 /* No point in jumping through all the hoops needed in order
749 to support BIGGEST_ALIGNMENT if we don't really have to.
750 So we cap to the smallest alignment that corresponds to
751 a known efficient memory access pattern of the target. */
752 unsigned int align_cap = Is_Atomic (gnat_entity)
754 : get_mode_alignment (ptr_mode);
756 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
757 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
760 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
762 /* But make sure not to under-align the object. */
763 if (align <= TYPE_ALIGN (gnu_type))
766 /* And honor the minimum valid atomic alignment, if any. */
767 #ifdef MINIMUM_ATOMIC_ALIGNMENT
768 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
769 align = MINIMUM_ATOMIC_ALIGNMENT;
773 /* If the object is set to have atomic components, find the component
774 type and validate it.
776 ??? Note that we ignore Has_Volatile_Components on objects; it's
777 not at all clear what to do in that case. */
779 if (Has_Atomic_Components (gnat_entity))
781 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
782 ? TREE_TYPE (gnu_type) : gnu_type);
784 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
785 && TYPE_MULTI_ARRAY_P (gnu_inner))
786 gnu_inner = TREE_TYPE (gnu_inner);
788 check_ok_for_atomic (gnu_inner, gnat_entity, true);
791 /* Now check if the type of the object allows atomic access. Note
792 that we must test the type, even if this object has size and
793 alignment to allow such access, because we will be going
794 inside the padded record to assign to the object. We could fix
795 this by always copying via an intermediate value, but it's not
796 clear it's worth the effort. */
797 if (Is_Atomic (gnat_entity))
798 check_ok_for_atomic (gnu_type, gnat_entity, false);
800 /* If this is an aliased object with an unconstrained nominal subtype,
801 make a type that includes the template. */
802 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
803 && Is_Array_Type (Etype (gnat_entity))
804 && !type_annotate_only)
807 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
810 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
811 concat_name (gnu_entity_name,
815 #ifdef MINIMUM_ATOMIC_ALIGNMENT
816 /* If the size is a constant and no alignment is specified, force
817 the alignment to be the minimum valid atomic alignment. The
818 restriction on constant size avoids problems with variable-size
819 temporaries; if the size is variable, there's no issue with
820 atomic access. Also don't do this for a constant, since it isn't
821 necessary and can interfere with constant replacement. Finally,
822 do not do it for Out parameters since that creates an
823 size inconsistency with In parameters. */
824 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
825 && !FLOAT_TYPE_P (gnu_type)
826 && !const_flag && No (Renamed_Object (gnat_entity))
827 && !imported_p && No (Address_Clause (gnat_entity))
828 && kind != E_Out_Parameter
829 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
830 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
831 align = MINIMUM_ATOMIC_ALIGNMENT;
834 /* Make a new type with the desired size and alignment, if needed.
835 But do not take into account alignment promotions to compute the
836 size of the object. */
837 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
838 if (gnu_size || align > 0)
839 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
840 false, false, definition,
841 gnu_size ? true : false);
843 /* If this is a renaming, avoid as much as possible to create a new
844 object. However, in several cases, creating it is required.
845 This processing needs to be applied to the raw expression so
846 as to make it more likely to rename the underlying object. */
847 if (Present (Renamed_Object (gnat_entity)))
849 bool create_normal_object = false;
851 /* If the renamed object had padding, strip off the reference
852 to the inner object and reset our type. */
853 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
854 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
855 /* Strip useless conversions around the object. */
856 || (TREE_CODE (gnu_expr) == NOP_EXPR
857 && gnat_types_compatible_p
858 (TREE_TYPE (gnu_expr),
859 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
861 gnu_expr = TREE_OPERAND (gnu_expr, 0);
862 gnu_type = TREE_TYPE (gnu_expr);
865 /* Case 1: If this is a constant renaming stemming from a function
866 call, treat it as a normal object whose initial value is what
867 is being renamed. RM 3.3 says that the result of evaluating a
868 function call is a constant object. As a consequence, it can
869 be the inner object of a constant renaming. In this case, the
870 renaming must be fully instantiated, i.e. it cannot be a mere
871 reference to (part of) an existing object. */
874 tree inner_object = gnu_expr;
875 while (handled_component_p (inner_object))
876 inner_object = TREE_OPERAND (inner_object, 0);
877 if (TREE_CODE (inner_object) == CALL_EXPR)
878 create_normal_object = true;
881 /* Otherwise, see if we can proceed with a stabilized version of
882 the renamed entity or if we need to make a new object. */
883 if (!create_normal_object)
885 tree maybe_stable_expr = NULL_TREE;
888 /* Case 2: If the renaming entity need not be materialized and
889 the renamed expression is something we can stabilize, use
890 that for the renaming. At the global level, we can only do
891 this if we know no SAVE_EXPRs need be made, because the
892 expression we return might be used in arbitrary conditional
893 branches so we must force the SAVE_EXPRs evaluation
894 immediately and this requires a function context. */
895 if (!Materialize_Entity (gnat_entity)
896 && (!global_bindings_p ()
897 || (staticp (gnu_expr)
898 && !TREE_SIDE_EFFECTS (gnu_expr))))
901 = gnat_stabilize_reference (gnu_expr, true, &stable);
905 /* ??? No DECL_EXPR is created so we need to mark
906 the expression manually lest it is shared. */
907 if (global_bindings_p ())
908 MARK_VISITED (maybe_stable_expr);
909 gnu_decl = maybe_stable_expr;
910 save_gnu_tree (gnat_entity, gnu_decl, true);
912 annotate_object (gnat_entity, gnu_type, NULL_TREE,
917 /* The stabilization failed. Keep maybe_stable_expr
918 untouched here to let the pointer case below know
919 about that failure. */
922 /* Case 3: If this is a constant renaming and creating a
923 new object is allowed and cheap, treat it as a normal
924 object whose initial value is what is being renamed. */
926 && !Is_Composite_Type
927 (Underlying_Type (Etype (gnat_entity))))
930 /* Case 4: Make this into a constant pointer to the object we
931 are to rename and attach the object to the pointer if it is
932 something we can stabilize.
934 From the proper scope, attached objects will be referenced
935 directly instead of indirectly via the pointer to avoid
936 subtle aliasing problems with non-addressable entities.
937 They have to be stable because we must not evaluate the
938 variables in the expression every time the renaming is used.
939 The pointer is called a "renaming" pointer in this case.
941 In the rare cases where we cannot stabilize the renamed
942 object, we just make a "bare" pointer, and the renamed
943 entity is always accessed indirectly through it. */
946 gnu_type = build_reference_type (gnu_type);
947 inner_const_flag = TREE_READONLY (gnu_expr);
950 /* If the previous attempt at stabilizing failed, there
951 is no point in trying again and we reuse the result
952 without attaching it to the pointer. In this case it
953 will only be used as the initializing expression of
954 the pointer and thus needs no special treatment with
955 regard to multiple evaluations. */
956 if (maybe_stable_expr)
959 /* Otherwise, try to stabilize and attach the expression
960 to the pointer if the stabilization succeeds.
962 Note that this might introduce SAVE_EXPRs and we don't
963 check whether we're at the global level or not. This
964 is fine since we are building a pointer initializer and
965 neither the pointer nor the initializing expression can
966 be accessed before the pointer elaboration has taken
967 place in a correct program.
969 These SAVE_EXPRs will be evaluated at the right place
970 by either the evaluation of the initializer for the
971 non-global case or the elaboration code for the global
972 case, and will be attached to the elaboration procedure
973 in the latter case. */
977 = gnat_stabilize_reference (gnu_expr, true, &stable);
980 renamed_obj = maybe_stable_expr;
982 /* Attaching is actually performed downstream, as soon
983 as we have a VAR_DECL for the pointer we make. */
987 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
989 gnu_size = NULL_TREE;
995 /* Make a volatile version of this object's type if we are to make
996 the object volatile. We also interpret 13.3(19) conservatively
997 and disallow any optimizations for such a non-constant object. */
998 if ((Treat_As_Volatile (gnat_entity)
1000 && (Is_Exported (gnat_entity)
1001 || Is_Imported (gnat_entity)
1002 || Present (Address_Clause (gnat_entity)))))
1003 && !TYPE_VOLATILE (gnu_type))
1004 gnu_type = build_qualified_type (gnu_type,
1005 (TYPE_QUALS (gnu_type)
1006 | TYPE_QUAL_VOLATILE));
1008 /* If we are defining an aliased object whose nominal subtype is
1009 unconstrained, the object is a record that contains both the
1010 template and the object. If there is an initializer, it will
1011 have already been converted to the right type, but we need to
1012 create the template if there is no initializer. */
1015 && TREE_CODE (gnu_type) == RECORD_TYPE
1016 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1017 /* Beware that padding might have been introduced above. */
1018 || (TYPE_PADDING_P (gnu_type)
1019 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1021 && TYPE_CONTAINS_TEMPLATE_P
1022 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1025 = TYPE_PADDING_P (gnu_type)
1026 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1027 : TYPE_FIELDS (gnu_type);
1030 = gnat_build_constructor
1034 build_template (TREE_TYPE (template_field),
1035 TREE_TYPE (TREE_CHAIN (template_field)),
1040 /* Convert the expression to the type of the object except in the
1041 case where the object's type is unconstrained or the object's type
1042 is a padded record whose field is of self-referential size. In
1043 the former case, converting will generate unnecessary evaluations
1044 of the CONSTRUCTOR to compute the size and in the latter case, we
1045 want to only copy the actual data. */
1047 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1048 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1049 && !(TYPE_IS_PADDING_P (gnu_type)
1050 && CONTAINS_PLACEHOLDER_P
1051 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1052 gnu_expr = convert (gnu_type, gnu_expr);
1054 /* If this is a pointer and it does not have an initializing
1055 expression, initialize it to NULL, unless the object is
1058 && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type))
1059 && !Is_Imported (gnat_entity) && !gnu_expr)
1060 gnu_expr = integer_zero_node;
1062 /* If we are defining the object and it has an Address clause, we must
1063 either get the address expression from the saved GCC tree for the
1064 object if it has a Freeze node, or elaborate the address expression
1065 here since the front-end has guaranteed that the elaboration has no
1066 effects in this case. */
1067 if (definition && Present (Address_Clause (gnat_entity)))
1070 = present_gnu_tree (gnat_entity)
1071 ? get_gnu_tree (gnat_entity)
1072 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1074 save_gnu_tree (gnat_entity, NULL_TREE, false);
1076 /* Ignore the size. It's either meaningless or was handled
1078 gnu_size = NULL_TREE;
1079 /* Convert the type of the object to a reference type that can
1080 alias everything as per 13.3(19). */
1082 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1083 gnu_address = convert (gnu_type, gnu_address);
1085 const_flag = !Is_Public (gnat_entity)
1086 || compile_time_known_address_p (Expression (Address_Clause
1089 /* If this is a deferred constant, the initializer is attached to
1091 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1094 (Expression (Declaration_Node (Full_View (gnat_entity))));
1096 /* If we don't have an initializing expression for the underlying
1097 variable, the initializing expression for the pointer is the
1098 specified address. Otherwise, we have to make a COMPOUND_EXPR
1099 to assign both the address and the initial value. */
1101 gnu_expr = gnu_address;
1104 = build2 (COMPOUND_EXPR, gnu_type,
1106 (MODIFY_EXPR, NULL_TREE,
1107 build_unary_op (INDIRECT_REF, NULL_TREE,
1113 /* If it has an address clause and we are not defining it, mark it
1114 as an indirect object. Likewise for Stdcall objects that are
1116 if ((!definition && Present (Address_Clause (gnat_entity)))
1117 || (Is_Imported (gnat_entity)
1118 && Has_Stdcall_Convention (gnat_entity)))
1120 /* Convert the type of the object to a reference type that can
1121 alias everything as per 13.3(19). */
1123 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1124 gnu_size = NULL_TREE;
1126 /* No point in taking the address of an initializing expression
1127 that isn't going to be used. */
1128 gnu_expr = NULL_TREE;
1130 /* If it has an address clause whose value is known at compile
1131 time, make the object a CONST_DECL. This will avoid a
1132 useless dereference. */
1133 if (Present (Address_Clause (gnat_entity)))
1135 Node_Id gnat_address
1136 = Expression (Address_Clause (gnat_entity));
1138 if (compile_time_known_address_p (gnat_address))
1140 gnu_expr = gnat_to_gnu (gnat_address);
1148 /* If we are at top level and this object is of variable size,
1149 make the actual type a hidden pointer to the real type and
1150 make the initializer be a memory allocation and initialization.
1151 Likewise for objects we aren't defining (presumed to be
1152 external references from other packages), but there we do
1153 not set up an initialization.
1155 If the object's size overflows, make an allocator too, so that
1156 Storage_Error gets raised. Note that we will never free
1157 such memory, so we presume it never will get allocated. */
1159 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1160 global_bindings_p () || !definition
1163 && ! allocatable_size_p (gnu_size,
1164 global_bindings_p () || !definition
1167 gnu_type = build_reference_type (gnu_type);
1168 gnu_size = NULL_TREE;
1172 /* In case this was a aliased object whose nominal subtype is
1173 unconstrained, the pointer above will be a thin pointer and
1174 build_allocator will automatically make the template.
1176 If we have a template initializer only (that we made above),
1177 pretend there is none and rely on what build_allocator creates
1178 again anyway. Otherwise (if we have a full initializer), get
1179 the data part and feed that to build_allocator.
1181 If we are elaborating a mutable object, tell build_allocator to
1182 ignore a possibly simpler size from the initializer, if any, as
1183 we must allocate the maximum possible size in this case. */
1187 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1189 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1190 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1193 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1195 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1196 && 1 == VEC_length (constructor_elt,
1197 CONSTRUCTOR_ELTS (gnu_expr)))
1201 = build_component_ref
1202 (gnu_expr, NULL_TREE,
1203 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1207 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1208 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1209 && !Is_Imported (gnat_entity))
1210 post_error ("?Storage_Error will be raised at run-time!",
1214 = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1215 Empty, Empty, gnat_entity, mutable_p);
1219 gnu_expr = NULL_TREE;
1224 /* If this object would go into the stack and has an alignment larger
1225 than the largest stack alignment the back-end can honor, resort to
1226 a variable of "aligning type". */
1227 if (!global_bindings_p () && !static_p && definition
1228 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1230 /* Create the new variable. No need for extra room before the
1231 aligned field as this is in automatic storage. */
1233 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1234 TYPE_SIZE_UNIT (gnu_type),
1235 BIGGEST_ALIGNMENT, 0);
1237 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1238 NULL_TREE, gnu_new_type, NULL_TREE, false,
1239 false, false, false, NULL, gnat_entity);
1241 /* Initialize the aligned field if we have an initializer. */
1244 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1246 (gnu_new_var, NULL_TREE,
1247 TYPE_FIELDS (gnu_new_type), false),
1251 /* And setup this entity as a reference to the aligned field. */
1252 gnu_type = build_reference_type (gnu_type);
1255 (ADDR_EXPR, gnu_type,
1256 build_component_ref (gnu_new_var, NULL_TREE,
1257 TYPE_FIELDS (gnu_new_type), false));
1259 gnu_size = NULL_TREE;
1265 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1266 | TYPE_QUAL_CONST));
1268 /* Convert the expression to the type of the object except in the
1269 case where the object's type is unconstrained or the object's type
1270 is a padded record whose field is of self-referential size. In
1271 the former case, converting will generate unnecessary evaluations
1272 of the CONSTRUCTOR to compute the size and in the latter case, we
1273 want to only copy the actual data. */
1275 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1276 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1277 && !(TYPE_IS_PADDING_P (gnu_type)
1278 && CONTAINS_PLACEHOLDER_P
1279 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1280 gnu_expr = convert (gnu_type, gnu_expr);
1282 /* If this name is external or there was a name specified, use it,
1283 unless this is a VMS exception object since this would conflict
1284 with the symbol we need to export in addition. Don't use the
1285 Interface_Name if there is an address clause (see CD30005). */
1286 if (!Is_VMS_Exception (gnat_entity)
1287 && ((Present (Interface_Name (gnat_entity))
1288 && No (Address_Clause (gnat_entity)))
1289 || (Is_Public (gnat_entity)
1290 && (!Is_Imported (gnat_entity)
1291 || Is_Exported (gnat_entity)))))
1292 gnu_ext_name = create_concat_name (gnat_entity, NULL);
1294 /* If this is constant initialized to a static constant and the
1295 object has an aggregate type, force it to be statically
1296 allocated. This will avoid an initialization copy. */
1297 if (!static_p && const_flag
1298 && gnu_expr && TREE_CONSTANT (gnu_expr)
1299 && AGGREGATE_TYPE_P (gnu_type)
1300 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1301 && !(TYPE_IS_PADDING_P (gnu_type)
1302 && !host_integerp (TYPE_SIZE_UNIT
1303 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1306 gnu_decl = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1307 gnu_expr, const_flag,
1308 Is_Public (gnat_entity),
1309 imported_p || !definition,
1310 static_p, attr_list, gnat_entity);
1311 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1312 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1313 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1315 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1316 if (global_bindings_p ())
1318 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1319 record_global_renaming_pointer (gnu_decl);
1323 if (definition && DECL_SIZE_UNIT (gnu_decl)
1324 && get_block_jmpbuf_decl ()
1325 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1326 || (flag_stack_check == GENERIC_STACK_CHECK
1327 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1328 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1329 add_stmt_with_node (build_call_1_expr
1330 (update_setjmp_buf_decl,
1331 build_unary_op (ADDR_EXPR, NULL_TREE,
1332 get_block_jmpbuf_decl ())),
1335 /* If we are defining an Out parameter and we're not optimizing,
1336 create a fake PARM_DECL for debugging purposes and make it
1337 point to the VAR_DECL. Suppress debug info for the latter
1338 but make sure it will still live on the stack so it can be
1339 accessed from within the debugger through the PARM_DECL. */
1340 if (kind == E_Out_Parameter && definition && !optimize)
1342 tree param = create_param_decl (gnu_entity_name, gnu_type, false);
1343 gnat_pushdecl (param, gnat_entity);
1344 SET_DECL_VALUE_EXPR (param, gnu_decl);
1345 DECL_HAS_VALUE_EXPR_P (param) = 1;
1347 debug_info_p = false;
1349 DECL_IGNORED_P (param) = 1;
1350 TREE_ADDRESSABLE (gnu_decl) = 1;
1353 /* If this is a public constant or we're not optimizing and we're not
1354 making a VAR_DECL for it, make one just for export or debugger use.
1355 Likewise if the address is taken or if either the object or type is
1356 aliased. Make an external declaration for a reference, unless this
1357 is a Standard entity since there no real symbol at the object level
1359 if (TREE_CODE (gnu_decl) == CONST_DECL
1360 && (definition || Sloc (gnat_entity) > Standard_Location)
1361 && ((Is_Public (gnat_entity) && No (Address_Clause (gnat_entity)))
1363 || Address_Taken (gnat_entity)
1364 || Is_Aliased (gnat_entity)
1365 || Is_Aliased (Etype (gnat_entity))))
1368 = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1369 gnu_expr, true, Is_Public (gnat_entity),
1370 !definition, static_p, attr_list,
1373 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1375 /* As debugging information will be generated for the variable,
1376 do not generate information for the constant. */
1377 DECL_IGNORED_P (gnu_decl) = 1;
1380 /* If this is a constant, even if we don't need a true variable, we
1381 may need to avoid returning the initializer in every case. That
1382 can happen for the address of a (constant) constructor because,
1383 upon dereferencing it, the constructor will be reinjected in the
1384 tree, which may not be valid in every case; see lvalue_required_p
1385 for more details. */
1386 if (TREE_CODE (gnu_decl) == CONST_DECL)
1387 DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr);
1389 /* If this is declared in a block that contains a block with an
1390 exception handler, we must force this variable in memory to
1391 suppress an invalid optimization. */
1392 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1393 && Exception_Mechanism != Back_End_Exceptions)
1394 TREE_ADDRESSABLE (gnu_decl) = 1;
1396 /* Back-annotate Esize and Alignment of the object if not already
1397 known. Note that we pick the values of the type, not those of
1398 the object, to shield ourselves from low-level platform-dependent
1399 adjustments like alignment promotion. This is both consistent with
1400 all the treatment above, where alignment and size are set on the
1401 type of the object and not on the object directly, and makes it
1402 possible to support all confirming representation clauses. */
1403 annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size,
1409 /* Return a TYPE_DECL for "void" that we previously made. */
1410 gnu_decl = TYPE_NAME (void_type_node);
1413 case E_Enumeration_Type:
1414 /* A special case: for the types Character and Wide_Character in
1415 Standard, we do not list all the literals. So if the literals
1416 are not specified, make this an unsigned type. */
1417 if (No (First_Literal (gnat_entity)))
1419 gnu_type = make_unsigned_type (esize);
1420 TYPE_NAME (gnu_type) = gnu_entity_name;
1422 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1423 This is needed by the DWARF-2 back-end to distinguish between
1424 unsigned integer types and character types. */
1425 TYPE_STRING_FLAG (gnu_type) = 1;
1430 /* We have a list of enumeral constants in First_Literal. We make a
1431 CONST_DECL for each one and build into GNU_LITERAL_LIST the list to
1432 be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST
1433 whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the
1434 value of the literal. But when we have a regular boolean type, we
1435 simplify this a little by using a BOOLEAN_TYPE. */
1436 bool is_boolean = Is_Boolean_Type (gnat_entity)
1437 && !Has_Non_Standard_Rep (gnat_entity);
1438 tree gnu_literal_list = NULL_TREE;
1439 Entity_Id gnat_literal;
1441 if (Is_Unsigned_Type (gnat_entity))
1442 gnu_type = make_unsigned_type (esize);
1444 gnu_type = make_signed_type (esize);
1446 TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE);
1448 for (gnat_literal = First_Literal (gnat_entity);
1449 Present (gnat_literal);
1450 gnat_literal = Next_Literal (gnat_literal))
1453 = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type);
1455 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1456 gnu_type, gnu_value, true, false, false,
1457 false, NULL, gnat_literal);
1459 save_gnu_tree (gnat_literal, gnu_literal, false);
1460 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1461 gnu_value, gnu_literal_list);
1465 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1467 /* Note that the bounds are updated at the end of this function
1468 to avoid an infinite recursion since they refer to the type. */
1472 case E_Signed_Integer_Type:
1473 case E_Ordinary_Fixed_Point_Type:
1474 case E_Decimal_Fixed_Point_Type:
1475 /* For integer types, just make a signed type the appropriate number
1477 gnu_type = make_signed_type (esize);
1480 case E_Modular_Integer_Type:
1482 /* For modular types, make the unsigned type of the proper number
1483 of bits and then set up the modulus, if required. */
1484 tree gnu_modulus, gnu_high = NULL_TREE;
1486 /* Packed array types are supposed to be subtypes only. */
1487 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1489 gnu_type = make_unsigned_type (esize);
1491 /* Get the modulus in this type. If it overflows, assume it is because
1492 it is equal to 2**Esize. Note that there is no overflow checking
1493 done on unsigned type, so we detect the overflow by looking for
1494 a modulus of zero, which is otherwise invalid. */
1495 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1497 if (!integer_zerop (gnu_modulus))
1499 TYPE_MODULAR_P (gnu_type) = 1;
1500 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1501 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1502 convert (gnu_type, integer_one_node));
1505 /* If the upper bound is not maximal, make an extra subtype. */
1507 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1509 tree gnu_subtype = make_unsigned_type (esize);
1510 SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high);
1511 TREE_TYPE (gnu_subtype) = gnu_type;
1512 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1513 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1514 gnu_type = gnu_subtype;
1519 case E_Signed_Integer_Subtype:
1520 case E_Enumeration_Subtype:
1521 case E_Modular_Integer_Subtype:
1522 case E_Ordinary_Fixed_Point_Subtype:
1523 case E_Decimal_Fixed_Point_Subtype:
1525 /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
1526 not want to call create_range_type since we would like each subtype
1527 node to be distinct. ??? Historically this was in preparation for
1528 when memory aliasing is implemented, but that's obsolete now given
1529 the call to relate_alias_sets below.
1531 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1532 this fact is used by the arithmetic conversion functions.
1534 We elaborate the Ancestor_Subtype if it is not in the current unit
1535 and one of our bounds is non-static. We do this to ensure consistent
1536 naming in the case where several subtypes share the same bounds, by
1537 elaborating the first such subtype first, thus using its name. */
1540 && Present (Ancestor_Subtype (gnat_entity))
1541 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1542 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1543 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1544 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1546 /* Set the precision to the Esize except for bit-packed arrays. */
1547 if (Is_Packed_Array_Type (gnat_entity)
1548 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1549 esize = UI_To_Int (RM_Size (gnat_entity));
1551 /* This should be an unsigned type if the base type is unsigned or
1552 if the lower bound is constant and non-negative or if the type
1554 if (Is_Unsigned_Type (Etype (gnat_entity))
1555 || Is_Unsigned_Type (gnat_entity)
1556 || Has_Biased_Representation (gnat_entity))
1557 gnu_type = make_unsigned_type (esize);
1559 gnu_type = make_signed_type (esize);
1560 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1562 SET_TYPE_RM_MIN_VALUE
1564 convert (TREE_TYPE (gnu_type),
1565 elaborate_expression (Type_Low_Bound (gnat_entity),
1566 gnat_entity, get_identifier ("L"),
1568 Needs_Debug_Info (gnat_entity))));
1570 SET_TYPE_RM_MAX_VALUE
1572 convert (TREE_TYPE (gnu_type),
1573 elaborate_expression (Type_High_Bound (gnat_entity),
1574 gnat_entity, get_identifier ("U"),
1576 Needs_Debug_Info (gnat_entity))));
1578 /* One of the above calls might have caused us to be elaborated,
1579 so don't blow up if so. */
1580 if (present_gnu_tree (gnat_entity))
1582 maybe_present = true;
1586 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1587 = Has_Biased_Representation (gnat_entity);
1589 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
1590 TYPE_STUB_DECL (gnu_type)
1591 = create_type_stub_decl (gnu_entity_name, gnu_type);
1593 /* Inherit our alias set from what we're a subtype of. Subtypes
1594 are not different types and a pointer can designate any instance
1595 within a subtype hierarchy. */
1596 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1598 /* For a packed array, make the original array type a parallel type. */
1600 && Is_Packed_Array_Type (gnat_entity)
1601 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1602 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1604 (Original_Array_Type (gnat_entity)));
1606 /* We have to handle clauses that under-align the type specially. */
1607 if ((Present (Alignment_Clause (gnat_entity))
1608 || (Is_Packed_Array_Type (gnat_entity)
1610 (Alignment_Clause (Original_Array_Type (gnat_entity)))))
1611 && UI_Is_In_Int_Range (Alignment (gnat_entity)))
1613 align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT;
1614 if (align >= TYPE_ALIGN (gnu_type))
1618 /* If the type we are dealing with represents a bit-packed array,
1619 we need to have the bits left justified on big-endian targets
1620 and right justified on little-endian targets. We also need to
1621 ensure that when the value is read (e.g. for comparison of two
1622 such values), we only get the good bits, since the unused bits
1623 are uninitialized. Both goals are accomplished by wrapping up
1624 the modular type in an enclosing record type. */
1625 if (Is_Packed_Array_Type (gnat_entity)
1626 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1628 tree gnu_field_type, gnu_field;
1630 /* Set the RM size before wrapping up the original type. */
1631 SET_TYPE_RM_SIZE (gnu_type,
1632 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1633 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1635 /* Create a stripped-down declaration, mainly for debugging. */
1636 create_type_decl (gnu_entity_name, gnu_type, NULL, true,
1637 debug_info_p, gnat_entity);
1639 /* Now save it and build the enclosing record type. */
1640 gnu_field_type = gnu_type;
1642 gnu_type = make_node (RECORD_TYPE);
1643 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1644 TYPE_PACKED (gnu_type) = 1;
1645 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
1646 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
1647 SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
1649 /* Propagate the alignment of the modular type to the record type,
1650 unless there is an alignment clause that under-aligns the type.
1651 This means that bit-packed arrays are given "ceil" alignment for
1652 their size by default, which may seem counter-intuitive but makes
1653 it possible to overlay them on modular types easily. */
1654 TYPE_ALIGN (gnu_type)
1655 = align > 0 ? align : TYPE_ALIGN (gnu_field_type);
1657 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1659 /* Don't notify the field as "addressable", since we won't be taking
1660 it's address and it would prevent create_field_decl from making a
1662 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1663 gnu_field_type, gnu_type, 1,
1664 NULL_TREE, bitsize_zero_node, 0);
1666 /* Do not emit debug info until after the parallel type is added. */
1667 finish_record_type (gnu_type, gnu_field, 2, false);
1668 compute_record_mode (gnu_type);
1669 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1673 /* Make the original array type a parallel type. */
1674 if (present_gnu_tree (Original_Array_Type (gnat_entity)))
1675 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1677 (Original_Array_Type (gnat_entity)));
1679 rest_of_record_type_compilation (gnu_type);
1683 /* If the type we are dealing with has got a smaller alignment than the
1684 natural one, we need to wrap it up in a record type and under-align
1685 the latter. We reuse the padding machinery for this purpose. */
1688 tree gnu_field_type, gnu_field;
1690 /* Set the RM size before wrapping up the type. */
1691 SET_TYPE_RM_SIZE (gnu_type,
1692 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1694 /* Create a stripped-down declaration, mainly for debugging. */
1695 create_type_decl (gnu_entity_name, gnu_type, NULL, true,
1696 debug_info_p, gnat_entity);
1698 /* Now save it and build the enclosing record type. */
1699 gnu_field_type = gnu_type;
1701 gnu_type = make_node (RECORD_TYPE);
1702 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1703 TYPE_PACKED (gnu_type) = 1;
1704 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
1705 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
1706 SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
1707 TYPE_ALIGN (gnu_type) = align;
1708 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1710 /* Don't notify the field as "addressable", since we won't be taking
1711 it's address and it would prevent create_field_decl from making a
1713 gnu_field = create_field_decl (get_identifier ("F"),
1714 gnu_field_type, gnu_type, 1,
1715 NULL_TREE, bitsize_zero_node, 0);
1717 finish_record_type (gnu_type, gnu_field, 2, debug_info_p);
1718 compute_record_mode (gnu_type);
1719 TYPE_PADDING_P (gnu_type) = 1;
1724 case E_Floating_Point_Type:
1725 /* If this is a VAX floating-point type, use an integer of the proper
1726 size. All the operations will be handled with ASM statements. */
1727 if (Vax_Float (gnat_entity))
1729 gnu_type = make_signed_type (esize);
1730 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1731 SET_TYPE_DIGITS_VALUE (gnu_type,
1732 UI_To_gnu (Digits_Value (gnat_entity),
1737 /* The type of the Low and High bounds can be our type if this is
1738 a type from Standard, so set them at the end of the function. */
1739 gnu_type = make_node (REAL_TYPE);
1740 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1741 layout_type (gnu_type);
1744 case E_Floating_Point_Subtype:
1745 if (Vax_Float (gnat_entity))
1747 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1753 && Present (Ancestor_Subtype (gnat_entity))
1754 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1755 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1756 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1757 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1760 gnu_type = make_node (REAL_TYPE);
1761 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1762 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1763 TYPE_GCC_MIN_VALUE (gnu_type)
1764 = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type));
1765 TYPE_GCC_MAX_VALUE (gnu_type)
1766 = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type));
1767 layout_type (gnu_type);
1769 SET_TYPE_RM_MIN_VALUE
1771 convert (TREE_TYPE (gnu_type),
1772 elaborate_expression (Type_Low_Bound (gnat_entity),
1773 gnat_entity, get_identifier ("L"),
1775 Needs_Debug_Info (gnat_entity))));
1777 SET_TYPE_RM_MAX_VALUE
1779 convert (TREE_TYPE (gnu_type),
1780 elaborate_expression (Type_High_Bound (gnat_entity),
1781 gnat_entity, get_identifier ("U"),
1783 Needs_Debug_Info (gnat_entity))));
1785 /* One of the above calls might have caused us to be elaborated,
1786 so don't blow up if so. */
1787 if (present_gnu_tree (gnat_entity))
1789 maybe_present = true;
1793 /* Inherit our alias set from what we're a subtype of, as for
1794 integer subtypes. */
1795 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1799 /* Array and String Types and Subtypes
1801 Unconstrained array types are represented by E_Array_Type and
1802 constrained array types are represented by E_Array_Subtype. There
1803 are no actual objects of an unconstrained array type; all we have
1804 are pointers to that type.
1806 The following fields are defined on array types and subtypes:
1808 Component_Type Component type of the array.
1809 Number_Dimensions Number of dimensions (an int).
1810 First_Index Type of first index. */
1815 Entity_Id gnat_index, gnat_name;
1816 const bool convention_fortran_p
1817 = (Convention (gnat_entity) == Convention_Fortran);
1818 const int ndim = Number_Dimensions (gnat_entity);
1819 tree gnu_template_fields = NULL_TREE;
1820 tree gnu_template_type = make_node (RECORD_TYPE);
1821 tree gnu_template_reference;
1822 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1823 tree gnu_fat_type = make_node (RECORD_TYPE);
1824 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
1825 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree));
1826 tree gnu_max_size = size_one_node, gnu_max_size_unit, tem;
1829 TYPE_NAME (gnu_template_type)
1830 = create_concat_name (gnat_entity, "XUB");
1832 /* Make a node for the array. If we are not defining the array
1833 suppress expanding incomplete types. */
1834 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1838 defer_incomplete_level++;
1839 this_deferred = true;
1842 /* Build the fat pointer type. Use a "void *" object instead of
1843 a pointer to the array type since we don't have the array type
1844 yet (it will reference the fat pointer via the bounds). */
1845 tem = chainon (chainon (NULL_TREE,
1846 create_field_decl (get_identifier ("P_ARRAY"),
1849 NULL_TREE, NULL_TREE, 0)),
1850 create_field_decl (get_identifier ("P_BOUNDS"),
1853 NULL_TREE, NULL_TREE, 0));
1855 /* Make sure we can put this into a register. */
1856 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1858 /* Do not emit debug info for this record type since the types of its
1859 fields are still incomplete at this point. */
1860 finish_record_type (gnu_fat_type, tem, 0, false);
1861 TYPE_FAT_POINTER_P (gnu_fat_type) = 1;
1863 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1864 is the fat pointer. This will be used to access the individual
1865 fields once we build them. */
1866 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1867 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1868 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1869 gnu_template_reference
1870 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1871 TREE_READONLY (gnu_template_reference) = 1;
1873 /* Now create the GCC type for each index and add the fields for that
1874 index to the template. */
1875 for (index = (convention_fortran_p ? ndim - 1 : 0),
1876 gnat_index = First_Index (gnat_entity);
1877 0 <= index && index < ndim;
1878 index += (convention_fortran_p ? - 1 : 1),
1879 gnat_index = Next_Index (gnat_index))
1881 char field_name[16];
1882 tree gnu_index_base_type
1883 = get_unpadded_type (Base_Type (Etype (gnat_index)));
1884 tree gnu_low_field, gnu_high_field, gnu_low, gnu_high, gnu_max;
1886 /* Make the FIELD_DECLs for the low and high bounds of this
1887 type and then make extractions of these fields from the
1889 sprintf (field_name, "LB%d", index);
1890 gnu_low_field = create_field_decl (get_identifier (field_name),
1891 gnu_index_base_type,
1892 gnu_template_type, 0,
1893 NULL_TREE, NULL_TREE, 0);
1894 Sloc_to_locus (Sloc (gnat_entity),
1895 &DECL_SOURCE_LOCATION (gnu_low_field));
1897 field_name[0] = 'U';
1898 gnu_high_field = create_field_decl (get_identifier (field_name),
1899 gnu_index_base_type,
1900 gnu_template_type, 0,
1901 NULL_TREE, NULL_TREE, 0);
1902 Sloc_to_locus (Sloc (gnat_entity),
1903 &DECL_SOURCE_LOCATION (gnu_high_field));
1905 gnu_temp_fields[index] = chainon (gnu_low_field, gnu_high_field);
1907 /* We can't use build_component_ref here since the template type
1908 isn't complete yet. */
1909 gnu_low = build3 (COMPONENT_REF, gnu_index_base_type,
1910 gnu_template_reference, gnu_low_field,
1912 gnu_high = build3 (COMPONENT_REF, gnu_index_base_type,
1913 gnu_template_reference, gnu_high_field,
1915 TREE_READONLY (gnu_low) = TREE_READONLY (gnu_high) = 1;
1917 /* Compute the size of this dimension. */
1919 = build3 (COND_EXPR, gnu_index_base_type,
1920 build2 (GE_EXPR, integer_type_node, gnu_high, gnu_low),
1922 build2 (MINUS_EXPR, gnu_index_base_type,
1923 gnu_low, fold_convert (gnu_index_base_type,
1924 integer_one_node)));
1926 /* Make a range type with the new range in the Ada base type.
1927 Then make an index type with the size range in sizetype. */
1928 gnu_index_types[index]
1929 = create_index_type (convert (sizetype, gnu_low),
1930 convert (sizetype, gnu_max),
1931 create_range_type (gnu_index_base_type,
1935 /* Update the maximum size of the array in elements. */
1938 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
1940 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type));
1942 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type));
1944 = size_binop (MAX_EXPR,
1945 size_binop (PLUS_EXPR, size_one_node,
1946 size_binop (MINUS_EXPR,
1950 if (TREE_CODE (gnu_this_max) == INTEGER_CST
1951 && TREE_OVERFLOW (gnu_this_max))
1952 gnu_max_size = NULL_TREE;
1955 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
1958 TYPE_NAME (gnu_index_types[index])
1959 = create_concat_name (gnat_entity, field_name);
1962 for (index = 0; index < ndim; index++)
1964 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1966 /* Install all the fields into the template. */
1967 finish_record_type (gnu_template_type, gnu_template_fields, 0,
1969 TYPE_READONLY (gnu_template_type) = 1;
1971 /* Now make the array of arrays and update the pointer to the array
1972 in the fat pointer. Note that it is the first field. */
1973 tem = gnat_to_gnu_component_type (gnat_entity, definition,
1976 /* If Component_Size is not already specified, annotate it with the
1977 size of the component. */
1978 if (Unknown_Component_Size (gnat_entity))
1979 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1981 /* Compute the maximum size of the array in units and bits. */
1984 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
1985 TYPE_SIZE_UNIT (tem));
1986 gnu_max_size = size_binop (MULT_EXPR,
1987 convert (bitsizetype, gnu_max_size),
1991 gnu_max_size_unit = NULL_TREE;
1993 /* Now build the array type. */
1994 for (index = ndim - 1; index >= 0; index--)
1996 tem = build_array_type (tem, gnu_index_types[index]);
1997 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1998 if (array_type_has_nonaliased_component (tem, gnat_entity))
1999 TYPE_NONALIASED_COMPONENT (tem) = 1;
2002 /* If an alignment is specified, use it if valid. But ignore it
2003 for the original type of packed array types. If the alignment
2004 was requested with an explicit alignment clause, state so. */
2005 if (No (Packed_Array_Type (gnat_entity))
2006 && Known_Alignment (gnat_entity))
2009 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2011 if (Present (Alignment_Clause (gnat_entity)))
2012 TYPE_USER_ALIGN (tem) = 1;
2015 TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p;
2016 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2018 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2019 corresponding fat pointer. */
2020 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2021 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2022 SET_TYPE_MODE (gnu_type, BLKmode);
2023 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2024 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2026 /* If the maximum size doesn't overflow, use it. */
2028 && TREE_CODE (gnu_max_size) == INTEGER_CST
2029 && !TREE_OVERFLOW (gnu_max_size)
2030 && TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2031 && !TREE_OVERFLOW (gnu_max_size_unit))
2033 TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size,
2035 TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit,
2036 TYPE_SIZE_UNIT (tem));
2039 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2040 tem, NULL, !Comes_From_Source (gnat_entity),
2041 debug_info_p, gnat_entity);
2043 /* Give the fat pointer type a name. If this is a packed type, tell
2044 the debugger how to interpret the underlying bits. */
2045 if (Present (Packed_Array_Type (gnat_entity)))
2046 gnat_name = Packed_Array_Type (gnat_entity);
2048 gnat_name = gnat_entity;
2049 create_type_decl (create_concat_name (gnat_name, "XUP"),
2050 gnu_fat_type, NULL, true,
2051 debug_info_p, gnat_entity);
2053 /* Create the type to be used as what a thin pointer designates: an
2054 record type for the object and its template with the field offsets
2055 shifted to have the template at a negative offset. */
2056 tem = build_unc_object_type (gnu_template_type, tem,
2057 create_concat_name (gnat_name, "XUT"));
2058 shift_unc_components_for_thin_pointers (tem);
2060 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2061 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2065 case E_String_Subtype:
2066 case E_Array_Subtype:
2068 /* This is the actual data type for array variables. Multidimensional
2069 arrays are implemented as arrays of arrays. Note that arrays which
2070 have sparse enumeration subtypes as index components create sparse
2071 arrays, which is obviously space inefficient but so much easier to
2074 Also note that the subtype never refers to the unconstrained array
2075 type, which is somewhat at variance with Ada semantics.
2077 First check to see if this is simply a renaming of the array type.
2078 If so, the result is the array type. */
2080 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2081 if (!Is_Constrained (gnat_entity))
2085 Entity_Id gnat_index, gnat_base_index;
2086 const bool convention_fortran_p
2087 = (Convention (gnat_entity) == Convention_Fortran);
2088 const int ndim = Number_Dimensions (gnat_entity);
2089 tree gnu_base_type = gnu_type;
2090 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
2091 tree gnu_max_size = size_one_node, gnu_max_size_unit;
2092 bool need_index_type_struct = false;
2095 /* First create the GCC type for each index and find out whether
2096 special types are needed for debugging information. */
2097 for (index = (convention_fortran_p ? ndim - 1 : 0),
2098 gnat_index = First_Index (gnat_entity),
2100 = First_Index (Implementation_Base_Type (gnat_entity));
2101 0 <= index && index < ndim;
2102 index += (convention_fortran_p ? - 1 : 1),
2103 gnat_index = Next_Index (gnat_index),
2104 gnat_base_index = Next_Index (gnat_base_index))
2106 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
2108 = compare_tree_int (TYPE_RM_SIZE (gnu_index_type),
2109 TYPE_PRECISION (sizetype));
2110 const bool subrange_p = (prec_comp < 0)
2112 && TYPE_UNSIGNED (gnu_index_type)
2113 == TYPE_UNSIGNED (sizetype));
2114 const bool wider_p = (prec_comp > 0);
2115 tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type);
2116 tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type);
2117 tree gnu_min = convert (sizetype, gnu_orig_min);
2118 tree gnu_max = convert (sizetype, gnu_orig_max);
2119 tree gnu_base_index_type
2120 = get_unpadded_type (Etype (gnat_base_index));
2121 tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type);
2122 tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type);
2123 tree gnu_high, gnu_low;
2125 /* See if the base array type is already flat. If it is, we
2126 are probably compiling an ACATS test but it will cause the
2127 code below to malfunction if we don't handle it specially. */
2128 if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST
2129 && TREE_CODE (gnu_base_orig_max) == INTEGER_CST
2130 && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min))
2132 gnu_min = size_one_node;
2133 gnu_max = size_zero_node;
2137 /* Similarly, if one of the values overflows in sizetype and the
2138 range is null, use 1..0 for the sizetype bounds. */
2139 else if (!subrange_p
2140 && TREE_CODE (gnu_min) == INTEGER_CST
2141 && TREE_CODE (gnu_max) == INTEGER_CST
2142 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2143 && tree_int_cst_lt (gnu_orig_max, gnu_orig_min))
2145 gnu_min = size_one_node;
2146 gnu_max = size_zero_node;
2150 /* If the minimum and maximum values both overflow in sizetype,
2151 but the difference in the original type does not overflow in
2152 sizetype, ignore the overflow indication. */
2153 else if (!subrange_p
2154 && TREE_CODE (gnu_min) == INTEGER_CST
2155 && TREE_CODE (gnu_max) == INTEGER_CST
2156 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2159 fold_build2 (MINUS_EXPR, gnu_index_type,
2163 TREE_OVERFLOW (gnu_min) = 0;
2164 TREE_OVERFLOW (gnu_max) = 0;
2168 /* Compute the size of this dimension in the general case. We
2169 need to provide GCC with an upper bound to use but have to
2170 deal with the "superflat" case. There are three ways to do
2171 this. If we can prove that the array can never be superflat,
2172 we can just use the high bound of the index type. */
2173 else if (Nkind (gnat_index) == N_Range
2174 && cannot_be_superflat_p (gnat_index))
2177 /* Otherwise, if we can prove that the low bound minus one and
2178 the high bound cannot overflow, we can just use the expression
2179 MAX (hb, lb - 1). Similarly, if we can prove that the high
2180 bound plus one and the low bound cannot overflow, we can use
2181 the high bound as-is and MIN (hb + 1, lb) for the low bound.
2182 Otherwise, we have to fall back to the most general expression
2183 (hb >= lb) ? hb : lb - 1. Note that the comparison must be
2184 done in the original index type, to avoid any overflow during
2188 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2189 gnu_low = size_binop (PLUS_EXPR, gnu_max, size_one_node);
2191 /* If gnu_high is a constant that has overflowed, the low
2192 bound is the smallest integer so cannot be the maximum.
2193 If gnu_low is a constant that has overflowed, the high
2194 bound is the highest integer so cannot be the minimum. */
2195 if ((TREE_CODE (gnu_high) == INTEGER_CST
2196 && TREE_OVERFLOW (gnu_high))
2197 || (TREE_CODE (gnu_low) == INTEGER_CST
2198 && TREE_OVERFLOW (gnu_low)))
2201 /* If the index type is a subrange and gnu_high a constant
2202 that hasn't overflowed, we can use the maximum. */
2203 else if (subrange_p && TREE_CODE (gnu_high) == INTEGER_CST)
2204 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2206 /* If the index type is a subrange and gnu_low a constant
2207 that hasn't overflowed, we can use the minimum. */
2208 else if (subrange_p && TREE_CODE (gnu_low) == INTEGER_CST)
2211 gnu_min = size_binop (MIN_EXPR, gnu_min, gnu_low);
2216 = build_cond_expr (sizetype,
2217 build_binary_op (GE_EXPR,
2224 gnu_index_types[index]
2225 = create_index_type (gnu_min, gnu_high, gnu_index_type,
2228 /* Update the maximum size of the array in elements. Here we
2229 see if any constraint on the index type of the base type
2230 can be used in the case of self-referential bound on the
2231 index type of the subtype. We look for a non-"infinite"
2232 and non-self-referential bound from any type involved and
2233 handle each bound separately. */
2236 tree gnu_base_min = convert (sizetype, gnu_base_orig_min);
2237 tree gnu_base_max = convert (sizetype, gnu_base_orig_max);
2238 tree gnu_base_index_base_type
2239 = get_base_type (gnu_base_index_type);
2240 tree gnu_base_base_min
2241 = convert (sizetype,
2242 TYPE_MIN_VALUE (gnu_base_index_base_type));
2243 tree gnu_base_base_max
2244 = convert (sizetype,
2245 TYPE_MAX_VALUE (gnu_base_index_base_type));
2247 if (!CONTAINS_PLACEHOLDER_P (gnu_min)
2248 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2249 && !TREE_OVERFLOW (gnu_base_min)))
2250 gnu_base_min = gnu_min;
2252 if (!CONTAINS_PLACEHOLDER_P (gnu_max)
2253 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2254 && !TREE_OVERFLOW (gnu_base_max)))
2255 gnu_base_max = gnu_max;
2257 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2258 && TREE_OVERFLOW (gnu_base_min))
2259 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2260 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2261 && TREE_OVERFLOW (gnu_base_max))
2262 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2263 gnu_max_size = NULL_TREE;
2267 = size_binop (MAX_EXPR,
2268 size_binop (PLUS_EXPR, size_one_node,
2269 size_binop (MINUS_EXPR,
2274 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2275 && TREE_OVERFLOW (gnu_this_max))
2276 gnu_max_size = NULL_TREE;
2279 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2283 /* We need special types for debugging information to point to
2284 the index types if they have variable bounds, are not integer
2285 types, are biased or are wider than sizetype. */
2286 if (!integer_onep (gnu_orig_min)
2287 || TREE_CODE (gnu_orig_max) != INTEGER_CST
2288 || TREE_CODE (gnu_index_type) != INTEGER_TYPE
2289 || (TREE_TYPE (gnu_index_type)
2290 && TREE_CODE (TREE_TYPE (gnu_index_type))
2292 || TYPE_BIASED_REPRESENTATION_P (gnu_index_type)
2294 need_index_type_struct = true;
2297 /* Then flatten: create the array of arrays. For an array type
2298 used to implement a packed array, get the component type from
2299 the original array type since the representation clauses that
2300 can affect it are on the latter. */
2301 if (Is_Packed_Array_Type (gnat_entity)
2302 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2304 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2305 for (index = ndim - 1; index >= 0; index--)
2306 gnu_type = TREE_TYPE (gnu_type);
2308 /* One of the above calls might have caused us to be elaborated,
2309 so don't blow up if so. */
2310 if (present_gnu_tree (gnat_entity))
2312 maybe_present = true;
2318 gnu_type = gnat_to_gnu_component_type (gnat_entity, definition,
2321 /* One of the above calls might have caused us to be elaborated,
2322 so don't blow up if so. */
2323 if (present_gnu_tree (gnat_entity))
2325 maybe_present = true;
2330 /* Compute the maximum size of the array in units and bits. */
2333 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2334 TYPE_SIZE_UNIT (gnu_type));
2335 gnu_max_size = size_binop (MULT_EXPR,
2336 convert (bitsizetype, gnu_max_size),
2337 TYPE_SIZE (gnu_type));
2340 gnu_max_size_unit = NULL_TREE;
2342 /* Now build the array type. */
2343 for (index = ndim - 1; index >= 0; index --)
2345 gnu_type = build_array_type (gnu_type, gnu_index_types[index]);
2346 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2347 if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
2348 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2351 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2352 TYPE_STUB_DECL (gnu_type)
2353 = create_type_stub_decl (gnu_entity_name, gnu_type);
2355 /* If we are at file level and this is a multi-dimensional array,
2356 we need to make a variable corresponding to the stride of the
2357 inner dimensions. */
2358 if (global_bindings_p () && ndim > 1)
2360 tree gnu_str_name = get_identifier ("ST");
2363 for (gnu_arr_type = TREE_TYPE (gnu_type);
2364 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2365 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2366 gnu_str_name = concat_name (gnu_str_name, "ST"))
2368 tree eltype = TREE_TYPE (gnu_arr_type);
2370 TYPE_SIZE (gnu_arr_type)
2371 = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type),
2372 gnat_entity, gnu_str_name,
2375 /* ??? For now, store the size as a multiple of the
2376 alignment of the element type in bytes so that we
2377 can see the alignment from the tree. */
2378 TYPE_SIZE_UNIT (gnu_arr_type)
2380 (MULT_EXPR, sizetype,
2381 elaborate_expression_1
2382 (build_binary_op (EXACT_DIV_EXPR, sizetype,
2383 TYPE_SIZE_UNIT (gnu_arr_type),
2384 size_int (TYPE_ALIGN (eltype)
2386 gnat_entity, concat_name (gnu_str_name, "A_U"),
2388 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2390 /* ??? create_type_decl is not invoked on the inner types so
2391 the MULT_EXPR node built above will never be marked. */
2392 MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type));
2396 /* If we need to write out a record type giving the names of the
2397 bounds for debugging purposes, do it now and make the record
2398 type a parallel type. This is not needed for a packed array
2399 since the bounds are conveyed by the original array type. */
2400 if (need_index_type_struct
2402 && !Is_Packed_Array_Type (gnat_entity))
2404 tree gnu_bound_rec = make_node (RECORD_TYPE);
2405 tree gnu_field_list = NULL_TREE;
2408 TYPE_NAME (gnu_bound_rec)
2409 = create_concat_name (gnat_entity, "XA");
2411 for (index = ndim - 1; index >= 0; index--)
2413 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]);
2414 tree gnu_index_name = TYPE_NAME (gnu_index);
2416 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2417 gnu_index_name = DECL_NAME (gnu_index_name);
2419 /* Make sure to reference the types themselves, and not just
2420 their names, as the debugger may fall back on them. */
2421 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2423 0, NULL_TREE, NULL_TREE, 0);
2424 TREE_CHAIN (gnu_field) = gnu_field_list;
2425 gnu_field_list = gnu_field;
2428 finish_record_type (gnu_bound_rec, gnu_field_list, 0, true);
2429 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2432 /* Otherwise, for a packed array, make the original array type a
2434 else if (debug_info_p
2435 && Is_Packed_Array_Type (gnat_entity)
2436 && present_gnu_tree (Original_Array_Type (gnat_entity)))
2437 add_parallel_type (TYPE_STUB_DECL (gnu_type),
2439 (Original_Array_Type (gnat_entity)));
2441 TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p;
2442 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2443 = (Is_Packed_Array_Type (gnat_entity)
2444 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2446 /* If the size is self-referential and the maximum size doesn't
2447 overflow, use it. */
2448 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2450 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2451 && TREE_OVERFLOW (gnu_max_size))
2452 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2453 && TREE_OVERFLOW (gnu_max_size_unit)))
2455 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2456 TYPE_SIZE (gnu_type));
2457 TYPE_SIZE_UNIT (gnu_type)
2458 = size_binop (MIN_EXPR, gnu_max_size_unit,
2459 TYPE_SIZE_UNIT (gnu_type));
2462 /* Set our alias set to that of our base type. This gives all
2463 array subtypes the same alias set. */
2464 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2466 /* If this is a packed type, make this type the same as the packed
2467 array type, but do some adjusting in the type first. */
2468 if (Present (Packed_Array_Type (gnat_entity)))
2470 Entity_Id gnat_index;
2473 /* First finish the type we had been making so that we output
2474 debugging information for it. */
2475 if (Treat_As_Volatile (gnat_entity))
2477 = build_qualified_type (gnu_type,
2478 TYPE_QUALS (gnu_type)
2479 | TYPE_QUAL_VOLATILE);
2481 /* Make it artificial only if the base type was artificial too.
2482 That's sort of "morally" true and will make it possible for
2483 the debugger to look it up by name in DWARF, which is needed
2484 in order to decode the packed array type. */
2486 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2487 !Comes_From_Source (Etype (gnat_entity))
2488 && !Comes_From_Source (gnat_entity),
2489 debug_info_p, gnat_entity);
2491 /* Save it as our equivalent in case the call below elaborates
2493 save_gnu_tree (gnat_entity, gnu_decl, false);
2495 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2497 this_made_decl = true;
2498 gnu_type = TREE_TYPE (gnu_decl);
2499 save_gnu_tree (gnat_entity, NULL_TREE, false);
2501 gnu_inner = gnu_type;
2502 while (TREE_CODE (gnu_inner) == RECORD_TYPE
2503 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner)
2504 || TYPE_PADDING_P (gnu_inner)))
2505 gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner));
2507 /* We need to attach the index type to the type we just made so
2508 that the actual bounds can later be put into a template. */
2509 if ((TREE_CODE (gnu_inner) == ARRAY_TYPE
2510 && !TYPE_ACTUAL_BOUNDS (gnu_inner))
2511 || (TREE_CODE (gnu_inner) == INTEGER_TYPE
2512 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner)))
2514 if (TREE_CODE (gnu_inner) == INTEGER_TYPE)
2516 /* The TYPE_ACTUAL_BOUNDS field is overloaded with the
2517 TYPE_MODULUS for modular types so we make an extra
2518 subtype if necessary. */
2519 if (TYPE_MODULAR_P (gnu_inner))
2522 = make_unsigned_type (TYPE_PRECISION (gnu_inner));
2523 TREE_TYPE (gnu_subtype) = gnu_inner;
2524 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2525 SET_TYPE_RM_MIN_VALUE (gnu_subtype,
2526 TYPE_MIN_VALUE (gnu_inner));
2527 SET_TYPE_RM_MAX_VALUE (gnu_subtype,
2528 TYPE_MAX_VALUE (gnu_inner));
2529 gnu_inner = gnu_subtype;
2532 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1;
2534 #ifdef ENABLE_CHECKING
2535 /* Check for other cases of overloading. */
2536 gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner));
2540 for (gnat_index = First_Index (gnat_entity);
2541 Present (gnat_index);
2542 gnat_index = Next_Index (gnat_index))
2543 SET_TYPE_ACTUAL_BOUNDS
2545 tree_cons (NULL_TREE,
2546 get_unpadded_type (Etype (gnat_index)),
2547 TYPE_ACTUAL_BOUNDS (gnu_inner)));
2549 if (Convention (gnat_entity) != Convention_Fortran)
2550 SET_TYPE_ACTUAL_BOUNDS
2551 (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner)));
2553 if (TREE_CODE (gnu_type) == RECORD_TYPE
2554 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2555 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner;
2560 /* Abort if packed array with no Packed_Array_Type field set. */
2561 gcc_assert (!Is_Packed (gnat_entity));
2565 case E_String_Literal_Subtype:
2566 /* Create the type for a string literal. */
2568 Entity_Id gnat_full_type
2569 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2570 && Present (Full_View (Etype (gnat_entity)))
2571 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2572 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2573 tree gnu_string_array_type
2574 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2575 tree gnu_string_index_type
2576 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2577 (TYPE_DOMAIN (gnu_string_array_type))));
2578 tree gnu_lower_bound
2579 = convert (gnu_string_index_type,
2580 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2581 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2582 tree gnu_length = ssize_int (length - 1);
2583 tree gnu_upper_bound
2584 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2586 convert (gnu_string_index_type, gnu_length));
2588 = create_index_type (convert (sizetype, gnu_lower_bound),
2589 convert (sizetype, gnu_upper_bound),
2590 create_range_type (gnu_string_index_type,
2596 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2598 if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
2599 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2600 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2604 /* Record Types and Subtypes
2606 The following fields are defined on record types:
2608 Has_Discriminants True if the record has discriminants
2609 First_Discriminant Points to head of list of discriminants
2610 First_Entity Points to head of list of fields
2611 Is_Tagged_Type True if the record is tagged
2613 Implementation of Ada records and discriminated records:
2615 A record type definition is transformed into the equivalent of a C
2616 struct definition. The fields that are the discriminants which are
2617 found in the Full_Type_Declaration node and the elements of the
2618 Component_List found in the Record_Type_Definition node. The
2619 Component_List can be a recursive structure since each Variant of
2620 the Variant_Part of the Component_List has a Component_List.
2622 Processing of a record type definition comprises starting the list of
2623 field declarations here from the discriminants and the calling the
2624 function components_to_record to add the rest of the fields from the
2625 component list and return the gnu type node. The function
2626 components_to_record will call itself recursively as it traverses
2630 if (Has_Complex_Representation (gnat_entity))
2633 = build_complex_type
2635 (Etype (Defining_Entity
2636 (First (Component_Items
2639 (Declaration_Node (gnat_entity)))))))));
2645 Node_Id full_definition = Declaration_Node (gnat_entity);
2646 Node_Id record_definition = Type_Definition (full_definition);
2647 Entity_Id gnat_field;
2648 tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent;
2649 /* Set PACKED in keeping with gnat_to_gnu_field. */
2651 = Is_Packed (gnat_entity)
2653 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2655 : (Known_Alignment (gnat_entity)
2656 || (Strict_Alignment (gnat_entity)
2657 && Known_Static_Esize (gnat_entity)))
2660 bool has_discr = Has_Discriminants (gnat_entity);
2661 bool has_rep = Has_Specified_Layout (gnat_entity);
2662 bool all_rep = has_rep;
2664 = (Is_Tagged_Type (gnat_entity)
2665 && Nkind (record_definition) == N_Derived_Type_Definition);
2666 bool is_unchecked_union = Is_Unchecked_Union (gnat_entity);
2668 /* See if all fields have a rep clause. Stop when we find one
2671 for (gnat_field = First_Entity (gnat_entity);
2672 Present (gnat_field);
2673 gnat_field = Next_Entity (gnat_field))
2674 if ((Ekind (gnat_field) == E_Component
2675 || Ekind (gnat_field) == E_Discriminant)
2676 && No (Component_Clause (gnat_field)))
2682 /* If this is a record extension, go a level further to find the
2683 record definition. Also, verify we have a Parent_Subtype. */
2686 if (!type_annotate_only
2687 || Present (Record_Extension_Part (record_definition)))
2688 record_definition = Record_Extension_Part (record_definition);
2690 gcc_assert (type_annotate_only
2691 || Present (Parent_Subtype (gnat_entity)));
2694 /* Make a node for the record. If we are not defining the record,
2695 suppress expanding incomplete types. */
2696 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2697 TYPE_NAME (gnu_type) = gnu_entity_name;
2698 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2702 defer_incomplete_level++;
2703 this_deferred = true;
2706 /* If both a size and rep clause was specified, put the size in
2707 the record type now so that it can get the proper mode. */
2708 if (has_rep && Known_Esize (gnat_entity))
2709 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2711 /* Always set the alignment here so that it can be used to
2712 set the mode, if it is making the alignment stricter. If
2713 it is invalid, it will be checked again below. If this is to
2714 be Atomic, choose a default alignment of a word unless we know
2715 the size and it's smaller. */
2716 if (Known_Alignment (gnat_entity))
2717 TYPE_ALIGN (gnu_type)
2718 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2719 else if (Is_Atomic (gnat_entity))
2720 TYPE_ALIGN (gnu_type)
2721 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2722 /* If a type needs strict alignment, the minimum size will be the
2723 type size instead of the RM size (see validate_size). Cap the
2724 alignment, lest it causes this type size to become too large. */
2725 else if (Strict_Alignment (gnat_entity)
2726 && Known_Static_Esize (gnat_entity))
2728 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2729 unsigned int raw_align = raw_size & -raw_size;
2730 if (raw_align < BIGGEST_ALIGNMENT)
2731 TYPE_ALIGN (gnu_type) = raw_align;
2734 TYPE_ALIGN (gnu_type) = 0;
2736 /* If we have a Parent_Subtype, make a field for the parent. If
2737 this record has rep clauses, force the position to zero. */
2738 if (Present (Parent_Subtype (gnat_entity)))
2740 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2743 /* A major complexity here is that the parent subtype will
2744 reference our discriminants in its Discriminant_Constraint
2745 list. But those must reference the parent component of this
2746 record which is of the parent subtype we have not built yet!
2747 To break the circle we first build a dummy COMPONENT_REF which
2748 represents the "get to the parent" operation and initialize
2749 each of those discriminants to a COMPONENT_REF of the above
2750 dummy parent referencing the corresponding discriminant of the
2751 base type of the parent subtype. */
2752 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2753 build0 (PLACEHOLDER_EXPR, gnu_type),
2754 build_decl (input_location,
2755 FIELD_DECL, NULL_TREE,
2760 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2761 Present (gnat_field);
2762 gnat_field = Next_Stored_Discriminant (gnat_field))
2763 if (Present (Corresponding_Discriminant (gnat_field)))
2766 = gnat_to_gnu_field_decl (Corresponding_Discriminant
2770 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2771 gnu_get_parent, gnu_field, NULL_TREE),
2775 /* Then we build the parent subtype. If it has discriminants but
2776 the type itself has unknown discriminants, this means that it
2777 doesn't contain information about how the discriminants are
2778 derived from those of the ancestor type, so it cannot be used
2779 directly. Instead it is built by cloning the parent subtype
2780 of the underlying record view of the type, for which the above
2781 derivation of discriminants has been made explicit. */
2782 if (Has_Discriminants (gnat_parent)
2783 && Has_Unknown_Discriminants (gnat_entity))
2785 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2787 /* If we are defining the type, the underlying record
2788 view must already have been elaborated at this point.
2789 Otherwise do it now as its parent subtype cannot be
2790 technically elaborated on its own. */
2792 gcc_assert (present_gnu_tree (gnat_uview));
2794 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2796 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2798 /* Substitute the "get to the parent" of the type for that
2799 of its underlying record view in the cloned type. */
2800 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2801 Present (gnat_field);
2802 gnat_field = Next_Stored_Discriminant (gnat_field))
2803 if (Present (Corresponding_Discriminant (gnat_field)))
2805 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2807 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2808 gnu_get_parent, gnu_field, NULL_TREE);
2810 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2814 gnu_parent = gnat_to_gnu_type (gnat_parent);
2816 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2817 initially built. The discriminants must reference the fields
2818 of the parent subtype and not those of its base type for the
2819 placeholder machinery to properly work. */
2822 /* The actual parent subtype is the full view. */
2823 if (IN (Ekind (gnat_parent), Private_Kind))
2825 if (Present (Full_View (gnat_parent)))
2826 gnat_parent = Full_View (gnat_parent);
2828 gnat_parent = Underlying_Full_View (gnat_parent);
2831 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2832 Present (gnat_field);
2833 gnat_field = Next_Stored_Discriminant (gnat_field))
2834 if (Present (Corresponding_Discriminant (gnat_field)))
2836 Entity_Id field = Empty;
2837 for (field = First_Stored_Discriminant (gnat_parent);
2839 field = Next_Stored_Discriminant (field))
2840 if (same_discriminant_p (gnat_field, field))
2842 gcc_assert (Present (field));
2843 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2844 = gnat_to_gnu_field_decl (field);
2848 /* The "get to the parent" COMPONENT_REF must be given its
2850 TREE_TYPE (gnu_get_parent) = gnu_parent;
2852 /* ...and reference the _Parent field of this record. */
2854 = create_field_decl (get_identifier
2855 (Get_Name_String (Name_uParent)),
2856 gnu_parent, gnu_type, 0,
2858 ? TYPE_SIZE (gnu_parent) : NULL_TREE,
2860 ? bitsize_zero_node : NULL_TREE, 1);
2861 DECL_INTERNAL_P (gnu_field) = 1;
2862 TREE_OPERAND (gnu_get_parent, 1) = gnu_field;
2863 TYPE_FIELDS (gnu_type) = gnu_field;
2866 /* Make the fields for the discriminants and put them into the record
2867 unless it's an Unchecked_Union. */
2869 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2870 Present (gnat_field);
2871 gnat_field = Next_Stored_Discriminant (gnat_field))
2873 /* If this is a record extension and this discriminant is the
2874 renaming of another discriminant, we've handled it above. */
2875 if (Present (Parent_Subtype (gnat_entity))
2876 && Present (Corresponding_Discriminant (gnat_field)))
2880 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition,
2883 /* Make an expression using a PLACEHOLDER_EXPR from the
2884 FIELD_DECL node just created and link that with the
2885 corresponding GNAT defining identifier. */
2886 save_gnu_tree (gnat_field,
2887 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2888 build0 (PLACEHOLDER_EXPR, gnu_type),
2889 gnu_field, NULL_TREE),
2892 if (!is_unchecked_union)
2894 TREE_CHAIN (gnu_field) = gnu_field_list;
2895 gnu_field_list = gnu_field;
2899 /* Add the fields into the record type and finish it up. */
2900 components_to_record (gnu_type, Component_List (record_definition),
2901 gnu_field_list, packed, definition, NULL,
2902 false, all_rep, is_unchecked_union,
2903 debug_info_p, false);
2905 /* If it is passed by reference, force BLKmode to ensure that objects
2906 + of this type will always be put in memory. */
2907 if (Is_By_Reference_Type (gnat_entity))
2908 SET_TYPE_MODE (gnu_type, BLKmode);
2910 /* We used to remove the associations of the discriminants and _Parent
2911 for validity checking but we may need them if there's a Freeze_Node
2912 for a subtype used in this record. */
2913 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2915 /* Fill in locations of fields. */
2916 annotate_rep (gnat_entity, gnu_type);
2918 /* If there are any entities in the chain corresponding to components
2919 that we did not elaborate, ensure we elaborate their types if they
2921 for (gnat_temp = First_Entity (gnat_entity);
2922 Present (gnat_temp);
2923 gnat_temp = Next_Entity (gnat_temp))
2924 if ((Ekind (gnat_temp) == E_Component
2925 || Ekind (gnat_temp) == E_Discriminant)
2926 && Is_Itype (Etype (gnat_temp))
2927 && !present_gnu_tree (gnat_temp))
2928 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2932 case E_Class_Wide_Subtype:
2933 /* If an equivalent type is present, that is what we should use.
2934 Otherwise, fall through to handle this like a record subtype
2935 since it may have constraints. */
2936 if (gnat_equiv_type != gnat_entity)
2938 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2939 maybe_present = true;
2943 /* ... fall through ... */
2945 case E_Record_Subtype:
2946 /* If Cloned_Subtype is Present it means this record subtype has
2947 identical layout to that type or subtype and we should use
2948 that GCC type for this one. The front end guarantees that
2949 the component list is shared. */
2950 if (Present (Cloned_Subtype (gnat_entity)))
2952 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2954 maybe_present = true;
2958 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2959 changing the type, make a new type with each field having the type of
2960 the field in the new subtype but the position computed by transforming
2961 every discriminant reference according to the constraints. We don't
2962 see any difference between private and non-private type here since
2963 derivations from types should have been deferred until the completion
2964 of the private type. */
2967 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2972 defer_incomplete_level++;
2973 this_deferred = true;
2976 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
2978 if (present_gnu_tree (gnat_entity))
2980 maybe_present = true;
2984 /* When the subtype has discriminants and these discriminants affect
2985 the initial shape it has inherited, factor them in. But for an
2986 Unchecked_Union (it must be an Itype), just return the type.
2987 We can't just test Is_Constrained because private subtypes without
2988 discriminants of types with discriminants with default expressions
2989 are Is_Constrained but aren't constrained! */
2990 if (IN (Ekind (gnat_base_type), Record_Kind)
2991 && !Is_Unchecked_Union (gnat_base_type)
2992 && !Is_For_Access_Subtype (gnat_entity)
2993 && Is_Constrained (gnat_entity)
2994 && Has_Discriminants (gnat_entity)
2995 && Present (Discriminant_Constraint (gnat_entity))
2996 && Stored_Constraint (gnat_entity) != No_Elist)
2999 = build_subst_list (gnat_entity, gnat_base_type, definition);
3000 tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part, t;
3001 tree gnu_variant_list, gnu_pos_list, gnu_field_list = NULL_TREE;
3002 bool selected_variant = false;
3003 Entity_Id gnat_field;
3005 gnu_type = make_node (RECORD_TYPE);
3006 TYPE_NAME (gnu_type) = gnu_entity_name;
3008 /* Set the size, alignment and alias set of the new type to
3009 match that of the old one, doing required substitutions. */
3010 copy_and_substitute_in_size (gnu_type, gnu_base_type,
3013 if (TYPE_IS_PADDING_P (gnu_base_type))
3014 gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3016 gnu_unpad_base_type = gnu_base_type;
3018 /* Look for a REP part in the base type. */
3019 gnu_rep_part = get_rep_part (gnu_unpad_base_type);
3021 /* Look for a variant part in the base type. */
3022 gnu_variant_part = get_variant_part (gnu_unpad_base_type);
3024 /* If there is a variant part, we must compute whether the
3025 constraints statically select a particular variant. If
3026 so, we simply drop the qualified union and flatten the
3027 list of fields. Otherwise we'll build a new qualified
3028 union for the variants that are still relevant. */
3029 if (gnu_variant_part)
3032 = build_variant_list (TREE_TYPE (gnu_variant_part),
3033 gnu_subst_list, NULL_TREE);
3035 /* If all the qualifiers are unconditionally true, the
3036 innermost variant is statically selected. */
3037 selected_variant = true;
3038 for (t = gnu_variant_list; t; t = TREE_CHAIN (t))
3039 if (!integer_onep (TREE_VEC_ELT (TREE_VALUE (t), 1)))
3041 selected_variant = false;
3045 /* Otherwise, create the new variants. */
3046 if (!selected_variant)
3047 for (t = gnu_variant_list; t; t = TREE_CHAIN (t))
3049 tree old_variant = TREE_PURPOSE (t);
3050 tree new_variant = make_node (RECORD_TYPE);
3051 TYPE_NAME (new_variant)
3052 = DECL_NAME (TYPE_NAME (old_variant));
3053 copy_and_substitute_in_size (new_variant, old_variant,
3055 TREE_VEC_ELT (TREE_VALUE (t), 2) = new_variant;
3060 gnu_variant_list = NULL_TREE;
3061 selected_variant = false;
3065 = build_position_list (gnu_unpad_base_type,
3066 gnu_variant_list && !selected_variant,
3067 size_zero_node, bitsize_zero_node,
3068 BIGGEST_ALIGNMENT, NULL_TREE);
3070 for (gnat_field = First_Entity (gnat_entity);
3071 Present (gnat_field);
3072 gnat_field = Next_Entity (gnat_field))
3073 if ((Ekind (gnat_field) == E_Component
3074 || Ekind (gnat_field) == E_Discriminant)
3075 && !(Present (Corresponding_Discriminant (gnat_field))
3076 && Is_Tagged_Type (gnat_base_type))
3077 && Underlying_Type (Scope (Original_Record_Component
3081 Name_Id gnat_name = Chars (gnat_field);
3082 Entity_Id gnat_old_field
3083 = Original_Record_Component (gnat_field);
3085 = gnat_to_gnu_field_decl (gnat_old_field);
3086 tree gnu_context = DECL_CONTEXT (gnu_old_field);
3087 tree gnu_field, gnu_field_type, gnu_size;
3088 tree gnu_cont_type, gnu_last = NULL_TREE;
3090 /* If the type is the same, retrieve the GCC type from the
3091 old field to take into account possible adjustments. */
3092 if (Etype (gnat_field) == Etype (gnat_old_field))
3093 gnu_field_type = TREE_TYPE (gnu_old_field);
3095 gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
3097 /* If there was a component clause, the field types must be
3098 the same for the type and subtype, so copy the data from
3099 the old field to avoid recomputation here. Also if the
3100 field is justified modular and the optimization in
3101 gnat_to_gnu_field was applied. */
3102 if (Present (Component_Clause (gnat_old_field))
3103 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3104 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3105 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3106 == TREE_TYPE (gnu_old_field)))
3108 gnu_size = DECL_SIZE (gnu_old_field);
3109 gnu_field_type = TREE_TYPE (gnu_old_field);
3112 /* If the old field was packed and of constant size, we
3113 have to get the old size here, as it might differ from
3114 what the Etype conveys and the latter might overlap
3115 onto the following field. Try to arrange the type for
3116 possible better packing along the way. */
3117 else if (DECL_PACKED (gnu_old_field)
3118 && TREE_CODE (DECL_SIZE (gnu_old_field))
3121 gnu_size = DECL_SIZE (gnu_old_field);
3122 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3123 && !TYPE_FAT_POINTER_P (gnu_field_type)
3124 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3126 = make_packable_type (gnu_field_type, true);
3130 gnu_size = TYPE_SIZE (gnu_field_type);
3132 /* If the context of the old field is the base type or its
3133 REP part (if any), put the field directly in the new
3134 type; otherwise look up the context in the variant list
3135 and put the field either in the new type if there is a
3136 selected variant or in one of the new variants. */
3137 if (gnu_context == gnu_unpad_base_type
3139 && gnu_context == TREE_TYPE (gnu_rep_part)))
3140 gnu_cont_type = gnu_type;
3143 t = purpose_member (gnu_context, gnu_variant_list);
3146 if (selected_variant)
3147 gnu_cont_type = gnu_type;
3149 gnu_cont_type = TREE_VEC_ELT (TREE_VALUE (t), 2);
3152 /* The front-end may pass us "ghost" components if
3153 it fails to recognize that a constrained subtype
3154 is statically constrained. Discard them. */
3158 /* Now create the new field modeled on the old one. */
3160 = create_field_decl_from (gnu_old_field, gnu_field_type,
3161 gnu_cont_type, gnu_size,
3162 gnu_pos_list, gnu_subst_list);
3164 /* Put it in one of the new variants directly. */
3165 if (gnu_cont_type != gnu_type)
3167 TREE_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type);
3168 TYPE_FIELDS (gnu_cont_type) = gnu_field;
3171 /* To match the layout crafted in components_to_record,
3172 if this is the _Tag or _Parent field, put it before
3173 any other fields. */
3174 else if (gnat_name == Name_uTag
3175 || gnat_name == Name_uParent)
3176 gnu_field_list = chainon (gnu_field_list, gnu_field);
3178 /* Similarly, if this is the _Controller field, put
3179 it before the other fields except for the _Tag or
3181 else if (gnat_name == Name_uController && gnu_last)
3183 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
3184 TREE_CHAIN (gnu_last) = gnu_field;
3187 /* Otherwise, if this is a regular field, put it after
3188 the other fields. */
3191 TREE_CHAIN (gnu_field) = gnu_field_list;
3192 gnu_field_list = gnu_field;
3194 gnu_last = gnu_field;
3197 save_gnu_tree (gnat_field, gnu_field, false);
3200 /* If there is a variant list and no selected variant, we need
3201 to create the nest of variant parts from the old nest. */
3202 if (gnu_variant_list && !selected_variant)
3204 tree new_variant_part
3205 = create_variant_part_from (gnu_variant_part,
3206 gnu_variant_list, gnu_type,
3207 gnu_pos_list, gnu_subst_list);
3208 TREE_CHAIN (new_variant_part) = gnu_field_list;
3209 gnu_field_list = new_variant_part;
3212 /* Now go through the entities again looking for Itypes that
3213 we have not elaborated but should (e.g., Etypes of fields
3214 that have Original_Components). */
3215 for (gnat_field = First_Entity (gnat_entity);
3216 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3217 if ((Ekind (gnat_field) == E_Discriminant
3218 || Ekind (gnat_field) == E_Component)
3219 && !present_gnu_tree (Etype (gnat_field)))
3220 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3222 /* Do not emit debug info for the type yet since we're going to
3224 gnu_field_list = nreverse (gnu_field_list);
3225 finish_record_type (gnu_type, gnu_field_list, 2, false);
3227 /* See the E_Record_Type case for the rationale. */
3228 if (Is_By_Reference_Type (gnat_entity))
3229 SET_TYPE_MODE (gnu_type, BLKmode);
3231 compute_record_mode (gnu_type);
3233 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3235 /* Fill in locations of fields. */
3236 annotate_rep (gnat_entity, gnu_type);
3238 /* If debugging information is being written for the type, write
3239 a record that shows what we are a subtype of and also make a
3240 variable that indicates our size, if still variable. */
3243 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3244 tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type);
3245 tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type);
3247 if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL)
3248 gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name);
3250 TYPE_NAME (gnu_subtype_marker)
3251 = create_concat_name (gnat_entity, "XVS");
3252 finish_record_type (gnu_subtype_marker,
3253 create_field_decl (gnu_unpad_base_name,
3254 build_reference_type
3255 (gnu_unpad_base_type),
3261 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3262 gnu_subtype_marker);
3265 && TREE_CODE (gnu_size_unit) != INTEGER_CST
3266 && !CONTAINS_PLACEHOLDER_P (gnu_size_unit))
3267 create_var_decl (create_concat_name (gnat_entity, "XVZ"),
3268 NULL_TREE, sizetype, gnu_size_unit, false,
3269 false, false, false, NULL, gnat_entity);
3272 /* Now we can finalize it. */
3273 rest_of_record_type_compilation (gnu_type);
3276 /* Otherwise, go down all the components in the new type and make
3277 them equivalent to those in the base type. */
3280 gnu_type = gnu_base_type;
3282 for (gnat_temp = First_Entity (gnat_entity);
3283 Present (gnat_temp);
3284 gnat_temp = Next_Entity (gnat_temp))
3285 if ((Ekind (gnat_temp) == E_Discriminant
3286 && !Is_Unchecked_Union (gnat_base_type))
3287 || Ekind (gnat_temp) == E_Component)
3288 save_gnu_tree (gnat_temp,
3289 gnat_to_gnu_field_decl
3290 (Original_Record_Component (gnat_temp)),
3296 case E_Access_Subprogram_Type:
3297 /* Use the special descriptor type for dispatch tables if needed,
3298 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3299 Note that we are only required to do so for static tables in
3300 order to be compatible with the C++ ABI, but Ada 2005 allows
3301 to extend library level tagged types at the local level so
3302 we do it in the non-static case as well. */
3303 if (TARGET_VTABLE_USES_DESCRIPTORS
3304 && Is_Dispatch_Table_Entity (gnat_entity))
3306 gnu_type = fdesc_type_node;
3307 gnu_size = TYPE_SIZE (gnu_type);
3311 /* ... fall through ... */
3313 case E_Anonymous_Access_Subprogram_Type:
3314 /* If we are not defining this entity, and we have incomplete
3315 entities being processed above us, make a dummy type and
3316 fill it in later. */
3317 if (!definition && defer_incomplete_level != 0)
3319 struct incomplete *p
3320 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3323 = build_pointer_type
3324 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3325 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3326 !Comes_From_Source (gnat_entity),
3327 debug_info_p, gnat_entity);
3328 this_made_decl = true;
3329 gnu_type = TREE_TYPE (gnu_decl);
3330 save_gnu_tree (gnat_entity, gnu_decl, false);
3333 p->old_type = TREE_TYPE (gnu_type);
3334 p->full_type = Directly_Designated_Type (gnat_entity);
3335 p->next = defer_incomplete_list;
3336 defer_incomplete_list = p;
3340 /* ... fall through ... */
3342 case E_Allocator_Type:
3344 case E_Access_Attribute_Type:
3345 case E_Anonymous_Access_Type:
3346 case E_General_Access_Type:
3348 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3349 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3350 bool is_from_limited_with
3351 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3352 && From_With_Type (gnat_desig_equiv));
3354 /* Get the "full view" of this entity. If this is an incomplete
3355 entity from a limited with, treat its non-limited view as the full
3356 view. Otherwise, if this is an incomplete or private type, use the
3357 full view. In the former case, we might point to a private type,
3358 in which case, we need its full view. Also, we want to look at the
3359 actual type used for the representation, so this takes a total of
3361 Entity_Id gnat_desig_full_direct_first
3362 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3363 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3364 ? Full_View (gnat_desig_equiv) : Empty));
3365 Entity_Id gnat_desig_full_direct
3366 = ((is_from_limited_with
3367 && Present (gnat_desig_full_direct_first)
3368 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3369 ? Full_View (gnat_desig_full_direct_first)
3370 : gnat_desig_full_direct_first);
3371 Entity_Id gnat_desig_full
3372 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3374 /* This the type actually used to represent the designated type,
3375 either gnat_desig_full or gnat_desig_equiv. */
3376 Entity_Id gnat_desig_rep;
3378 /* True if this is a pointer to an unconstrained array. */
3379 bool is_unconstrained_array;
3381 /* We want to know if we'll be seeing the freeze node for any
3382 incomplete type we may be pointing to. */
3384 = (Present (gnat_desig_full)
3385 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3386 : In_Extended_Main_Code_Unit (gnat_desig_type));
3388 /* True if we make a dummy type here. */
3389 bool got_fat_p = false;
3390 /* True if the dummy is a fat pointer. */
3391 bool made_dummy = false;
3392 tree gnu_desig_type = NULL_TREE;
3393 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3395 if (!targetm.valid_pointer_mode (p_mode))
3398 /* If either the designated type or its full view is an unconstrained
3399 array subtype, replace it with the type it's a subtype of. This
3400 avoids problems with multiple copies of unconstrained array types.
3401 Likewise, if the designated type is a subtype of an incomplete
3402 record type, use the parent type to avoid order of elaboration
3403 issues. This can lose some code efficiency, but there is no
3405 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3406 && ! Is_Constrained (gnat_desig_equiv))
3407 gnat_desig_equiv = Etype (gnat_desig_equiv);
3408 if (Present (gnat_desig_full)
3409 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3410 && ! Is_Constrained (gnat_desig_full))
3411 || (Ekind (gnat_desig_full) == E_Record_Subtype
3412 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3413 gnat_desig_full = Etype (gnat_desig_full);
3415 /* Now set the type that actually marks the representation of
3416 the designated type and also flag whether we have a unconstrained
3418 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3419 is_unconstrained_array
3420 = (Is_Array_Type (gnat_desig_rep)
3421 && ! Is_Constrained (gnat_desig_rep));
3423 /* If we are pointing to an incomplete type whose completion is an
3424 unconstrained array, make a fat pointer type. The two types in our
3425 fields will be pointers to dummy nodes and will be replaced in
3426 update_pointer_to. Similarly, if the type itself is a dummy type or
3427 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3428 in case we have any thin pointers to it. */
3429 if (is_unconstrained_array
3430 && (Present (gnat_desig_full)
3431 || (present_gnu_tree (gnat_desig_equiv)
3432 && TYPE_IS_DUMMY_P (TREE_TYPE
3433 (get_gnu_tree (gnat_desig_equiv))))
3434 || (No (gnat_desig_full) && ! in_main_unit
3435 && defer_incomplete_level != 0
3436 && ! present_gnu_tree (gnat_desig_equiv))
3437 || (in_main_unit && is_from_limited_with
3438 && Present (Freeze_Node (gnat_desig_rep)))))
3442 if (present_gnu_tree (gnat_desig_rep))
3443 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3446 gnu_old = make_dummy_type (gnat_desig_rep);
3448 /* Show the dummy we get will be a fat pointer. */
3449 got_fat_p = made_dummy = true;
3452 /* If the call above got something that has a pointer, that
3453 pointer is our type. This could have happened either
3454 because the type was elaborated or because somebody
3455 else executed the code below. */
3456 gnu_type = TYPE_POINTER_TO (gnu_old);
3459 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3460 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3461 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3462 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3465 TYPE_NAME (gnu_template_type)
3466 = create_concat_name (gnat_desig_equiv, "XUB");
3467 TYPE_DUMMY_P (gnu_template_type) = 1;
3469 TYPE_NAME (gnu_array_type)
3470 = create_concat_name (gnat_desig_equiv, "XUA");
3471 TYPE_DUMMY_P (gnu_array_type) = 1;
3473 gnu_type = make_node (RECORD_TYPE);
3474 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3475 TYPE_POINTER_TO (gnu_old) = gnu_type;
3477 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3479 = chainon (chainon (NULL_TREE,
3481 (get_identifier ("P_ARRAY"),
3483 gnu_type, 0, 0, 0, 0)),
3484 create_field_decl (get_identifier ("P_BOUNDS"),
3486 gnu_type, 0, 0, 0, 0));
3488 /* Make sure we can place this into a register. */
3489 TYPE_ALIGN (gnu_type)
3490 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3491 TYPE_FAT_POINTER_P (gnu_type) = 1;
3493 /* Do not emit debug info for this record type since the types
3494 of its fields are incomplete. */
3495 finish_record_type (gnu_type, fields, 0, false);
3497 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3498 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3499 = create_concat_name (gnat_desig_equiv, "XUT");
3500 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3504 /* If we already know what the full type is, use it. */
3505 else if (Present (gnat_desig_full)
3506 && present_gnu_tree (gnat_desig_full))
3507 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3509 /* Get the type of the thing we are to point to and build a pointer
3510 to it. If it is a reference to an incomplete or private type with a
3511 full view that is a record, make a dummy type node and get the
3512 actual type later when we have verified it is safe. */
3513 else if ((! in_main_unit
3514 && ! present_gnu_tree (gnat_desig_equiv)
3515 && Present (gnat_desig_full)
3516 && ! present_gnu_tree (gnat_desig_full)
3517 && Is_Record_Type (gnat_desig_full))
3518 /* Likewise if we are pointing to a record or array and we
3519 are to defer elaborating incomplete types. We do this
3520 since this access type may be the full view of some
3521 private type. Note that the unconstrained array case is
3523 || ((! in_main_unit || imported_p)
3524 && defer_incomplete_level != 0
3525 && ! present_gnu_tree (gnat_desig_equiv)
3526 && ((Is_Record_Type (gnat_desig_rep)
3527 || Is_Array_Type (gnat_desig_rep))))
3528 /* If this is a reference from a limited_with type back to our
3529 main unit and there's a Freeze_Node for it, either we have
3530 already processed the declaration and made the dummy type,
3531 in which case we just reuse the latter, or we have not yet,
3532 in which case we make the dummy type and it will be reused
3533 when the declaration is processed. In both cases, the
3534 pointer eventually created below will be automatically
3535 adjusted when the Freeze_Node is processed. Note that the
3536 unconstrained array case is handled above. */
3537 || (in_main_unit && is_from_limited_with
3538 && Present (Freeze_Node (gnat_desig_rep))))
3540 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3544 /* Otherwise handle the case of a pointer to itself. */
3545 else if (gnat_desig_equiv == gnat_entity)
3548 = build_pointer_type_for_mode (void_type_node, p_mode,
3549 No_Strict_Aliasing (gnat_entity));
3550 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3553 /* If expansion is disabled, the equivalent type of a concurrent
3554 type is absent, so build a dummy pointer type. */
3555 else if (type_annotate_only && No (gnat_desig_equiv))
3556 gnu_type = ptr_void_type_node;
3558 /* Finally, handle the straightforward case where we can just
3559 elaborate our designated type and point to it. */
3561 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3563 /* It is possible that a call to gnat_to_gnu_type above resolved our
3564 type. If so, just return it. */
3565 if (present_gnu_tree (gnat_entity))
3567 maybe_present = true;
3571 /* If we have a GCC type for the designated type, possibly modify it
3572 if we are pointing only to constant objects and then make a pointer
3573 to it. Don't do this for unconstrained arrays. */
3574 if (!gnu_type && gnu_desig_type)
3576 if (Is_Access_Constant (gnat_entity)
3577 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3580 = build_qualified_type
3582 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3584 /* Some extra processing is required if we are building a
3585 pointer to an incomplete type (in the GCC sense). We might
3586 have such a type if we just made a dummy, or directly out
3587 of the call to gnat_to_gnu_type above if we are processing
3588 an access type for a record component designating the
3589 record type itself. */
3590 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3592 /* We must ensure that the pointer to variant we make will
3593 be processed by update_pointer_to when the initial type
3594 is completed. Pretend we made a dummy and let further
3595 processing act as usual. */
3598 /* We must ensure that update_pointer_to will not retrieve
3599 the dummy variant when building a properly qualified
3600 version of the complete type. We take advantage of the
3601 fact that get_qualified_type is requiring TYPE_NAMEs to
3602 match to influence build_qualified_type and then also
3603 update_pointer_to here. */
3604 TYPE_NAME (gnu_desig_type)
3605 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3610 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3611 No_Strict_Aliasing (gnat_entity));
3614 /* If we are not defining this object and we made a dummy pointer,
3615 save our current definition, evaluate the actual type, and replace
3616 the tentative type we made with the actual one. If we are to defer
3617 actually looking up the actual type, make an entry in the
3618 deferred list. If this is from a limited with, we have to defer
3619 to the end of the current spec in two cases: first if the
3620 designated type is in the current unit and second if the access
3622 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3625 = TYPE_IS_FAT_POINTER_P (gnu_type)
3626 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3628 if (esize == POINTER_SIZE
3629 && (got_fat_p || TYPE_IS_FAT_POINTER_P (gnu_type)))
3631 = build_pointer_type
3632 (TYPE_OBJECT_RECORD_TYPE
3633 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3635 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3636 !Comes_From_Source (gnat_entity),
3637 debug_info_p, gnat_entity);
3638 this_made_decl = true;
3639 gnu_type = TREE_TYPE (gnu_decl);
3640 save_gnu_tree (gnat_entity, gnu_decl, false);
3643 if (defer_incomplete_level == 0
3644 && ! (is_from_limited_with
3646 || In_Extended_Main_Code_Unit (gnat_entity))))
3647 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3648 gnat_to_gnu_type (gnat_desig_equiv));
3650 /* Note that the call to gnat_to_gnu_type here might have
3651 updated gnu_old_type directly, in which case it is not a
3652 dummy type any more when we get into update_pointer_to.
3654 This may happen for instance when the designated type is a
3655 record type, because their elaboration starts with an
3656 initial node from make_dummy_type, which may yield the same
3657 node as the one we got.
3659 Besides, variants of this non-dummy type might have been
3660 created along the way. update_pointer_to is expected to
3661 properly take care of those situations. */
3664 struct incomplete *p
3665 = (struct incomplete *) xmalloc (sizeof
3666 (struct incomplete));
3667 struct incomplete **head
3668 = (is_from_limited_with
3670 || In_Extended_Main_Code_Unit (gnat_entity))
3671 ? &defer_limited_with : &defer_incomplete_list);
3673 p->old_type = gnu_old_type;
3674 p->full_type = gnat_desig_equiv;
3682 case E_Access_Protected_Subprogram_Type:
3683 case E_Anonymous_Access_Protected_Subprogram_Type:
3684 if (type_annotate_only && No (gnat_equiv_type))
3685 gnu_type = ptr_void_type_node;
3688 /* The runtime representation is the equivalent type. */
3689 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3690 maybe_present = true;
3693 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3694 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3695 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3696 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3697 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3702 case E_Access_Subtype:
3704 /* We treat this as identical to its base type; any constraint is
3705 meaningful only to the front end.
3707 The designated type must be elaborated as well, if it does
3708 not have its own freeze node. Designated (sub)types created
3709 for constrained components of records with discriminants are
3710 not frozen by the front end and thus not elaborated by gigi,
3711 because their use may appear before the base type is frozen,
3712 and because it is not clear that they are needed anywhere in
3713 Gigi. With the current model, there is no correct place where
3714 they could be elaborated. */
3716 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3717 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3718 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3719 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3720 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3722 /* If we are not defining this entity, and we have incomplete
3723 entities being processed above us, make a dummy type and
3724 elaborate it later. */
3725 if (!definition && defer_incomplete_level != 0)
3727 struct incomplete *p
3728 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3730 = build_pointer_type
3731 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3733 p->old_type = TREE_TYPE (gnu_ptr_type);
3734 p->full_type = Directly_Designated_Type (gnat_entity);
3735 p->next = defer_incomplete_list;
3736 defer_incomplete_list = p;
3738 else if (!IN (Ekind (Base_Type
3739 (Directly_Designated_Type (gnat_entity))),
3740 Incomplete_Or_Private_Kind))
3741 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3745 maybe_present = true;
3748 /* Subprogram Entities
3750 The following access functions are defined for subprograms (functions
3753 First_Formal The first formal parameter.
3754 Is_Imported Indicates that the subprogram has appeared in
3755 an INTERFACE or IMPORT pragma. For now we
3756 assume that the external language is C.
3757 Is_Exported Likewise but for an EXPORT pragma.
3758 Is_Inlined True if the subprogram is to be inlined.
3760 In addition for function subprograms we have:
3762 Etype Return type of the function.
3764 Each parameter is first checked by calling must_pass_by_ref on its
3765 type to determine if it is passed by reference. For parameters which
3766 are copied in, if they are Ada In Out or Out parameters, their return
3767 value becomes part of a record which becomes the return type of the
3768 function (C function - note that this applies only to Ada procedures
3769 so there is no Ada return type). Additional code to store back the
3770 parameters will be generated on the caller side. This transformation
3771 is done here, not in the front-end.
3773 The intended result of the transformation can be seen from the
3774 equivalent source rewritings that follow:
3776 struct temp {int a,b};
3777 procedure P (A,B: In Out ...) is temp P (int A,B)
3780 end P; return {A,B};
3787 For subprogram types we need to perform mainly the same conversions to
3788 GCC form that are needed for procedures and function declarations. The
3789 only difference is that at the end, we make a type declaration instead
3790 of a function declaration. */
3792 case E_Subprogram_Type:
3796 /* The first GCC parameter declaration (a PARM_DECL node). The
3797 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3798 actually is the head of this parameter list. */
3799 tree gnu_param_list = NULL_TREE;
3800 /* Likewise for the stub associated with an exported procedure. */
3801 tree gnu_stub_param_list = NULL_TREE;
3802 /* The type returned by a function. If the subprogram is a procedure
3803 this type should be void_type_node. */
3804 tree gnu_return_type = void_type_node;
3805 /* List of fields in return type of procedure with copy-in copy-out
3807 tree gnu_field_list = NULL_TREE;
3808 /* Non-null for subprograms containing parameters passed by copy-in
3809 copy-out (Ada In Out or Out parameters not passed by reference),
3810 in which case it is the list of nodes used to specify the values
3811 of the In Out/Out parameters that are returned as a record upon
3812 procedure return. The TREE_PURPOSE of an element of this list is
3813 a field of the record and the TREE_VALUE is the PARM_DECL
3814 corresponding to that field. This list will be saved in the
3815 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3816 tree gnu_cico_list = NULL_TREE;
3817 /* If an import pragma asks to map this subprogram to a GCC builtin,
3818 this is the builtin DECL node. */
3819 tree gnu_builtin_decl = NULL_TREE;
3820 /* For the stub associated with an exported procedure. */
3821 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3822 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3823 Entity_Id gnat_param;
3824 bool inline_flag = Is_Inlined (gnat_entity);
3825 bool public_flag = Is_Public (gnat_entity) || imported_p;
3827 = (Is_Public (gnat_entity) && !definition) || imported_p;
3829 /* The semantics of "pure" in Ada essentially matches that of "const"
3830 in the back-end. In particular, both properties are orthogonal to
3831 the "nothrow" property if the EH circuitry is explicit in the
3832 internal representation of the back-end. If we are to completely
3833 hide the EH circuitry from it, we need to declare that calls to pure
3834 Ada subprograms that can throw have side effects since they can
3835 trigger an "abnormal" transfer of control flow; thus they can be
3836 neither "const" nor "pure" in the back-end sense. */
3838 = (Exception_Mechanism == Back_End_Exceptions
3839 && Is_Pure (gnat_entity));
3841 bool volatile_flag = No_Return (gnat_entity);
3842 bool return_by_direct_ref_p = false;
3843 bool return_by_invisi_ref_p = false;
3844 bool return_unconstrained_p = false;
3845 bool has_copy_in_out = false;
3846 bool has_stub = false;
3849 /* A parameter may refer to this type, so defer completion of any
3850 incomplete types. */
3851 if (kind == E_Subprogram_Type && !definition)
3853 defer_incomplete_level++;
3854 this_deferred = true;
3857 /* If the subprogram has an alias, it is probably inherited, so
3858 we can use the original one. If the original "subprogram"
3859 is actually an enumeration literal, it may be the first use
3860 of its type, so we must elaborate that type now. */
3861 if (Present (Alias (gnat_entity)))
3863 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3864 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3866 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3869 /* Elaborate any Itypes in the parameters of this entity. */
3870 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3871 Present (gnat_temp);
3872 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3873 if (Is_Itype (Etype (gnat_temp)))
3874 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3879 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3880 corresponding DECL node.
3882 We still want the parameter associations to take place because the
3883 proper generation of calls depends on it (a GNAT parameter without
3884 a corresponding GCC tree has a very specific meaning), so we don't
3886 if (Convention (gnat_entity) == Convention_Intrinsic)
3887 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3889 /* ??? What if we don't find the builtin node above ? warn ? err ?
3890 In the current state we neither warn nor err, and calls will just
3891 be handled as for regular subprograms. */
3893 if (kind == E_Function || kind == E_Subprogram_Type)
3894 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3896 /* If this function returns by reference, make the actual return
3897 type of this function the pointer and mark the decl. */
3898 if (Returns_By_Ref (gnat_entity))
3900 gnu_return_type = build_pointer_type (gnu_return_type);
3901 return_by_direct_ref_p = true;
3904 /* If the Mechanism is By_Reference, ensure this function uses the
3905 target's by-invisible-reference mechanism, which may not be the
3906 same as above (e.g. it might be passing an extra parameter).
3908 Prior to GCC 4, this was handled by just setting TREE_ADDRESSABLE
3909 on the result type. Everything required to pass by invisible
3910 reference using the target's mechanism (e.g. an extra parameter)
3911 was handled at RTL expansion time.
3913 This doesn't work with GCC 4 any more for several reasons. First,
3914 the gimplification process might need to create temporaries of this
3915 type and the gimplifier ICEs on such attempts; that's why the flag
3916 is now set on the function type instead. Second, the middle-end
3917 now also relies on a different attribute, DECL_BY_REFERENCE on the
3918 RESULT_DECL, and expects the by-invisible-reference-ness to be made
3919 explicit in the function body. */
3920 else if (kind == E_Function && Mechanism (gnat_entity) == By_Reference)
3921 return_by_invisi_ref_p = true;
3923 /* If we are supposed to return an unconstrained array, actually return
3924 a fat pointer and make a note of that. */
3925 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3927 gnu_return_type = TREE_TYPE (gnu_return_type);
3928 return_unconstrained_p = true;
3931 /* If the type requires a transient scope, the result is allocated
3932 on the secondary stack, so the result type of the function is
3934 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3936 gnu_return_type = build_pointer_type (gnu_return_type);
3937 return_unconstrained_p = true;
3940 /* If the type is a padded type and the underlying type would not
3941 be passed by reference or this function has a foreign convention,
3942 return the underlying type. */
3943 else if (TYPE_IS_PADDING_P (gnu_return_type)
3944 && (!default_pass_by_ref (TREE_TYPE
3945 (TYPE_FIELDS (gnu_return_type)))
3946 || Has_Foreign_Convention (gnat_entity)))
3947 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3949 /* If the return type is unconstrained, that means it must have a
3950 maximum size. Use the padded type as the effective return type.
3951 And ensure the function uses the target's by-invisible-reference
3952 mechanism to avoid copying too much data when it returns. */
3953 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type)))
3956 = maybe_pad_type (gnu_return_type,
3957 max_size (TYPE_SIZE (gnu_return_type), true),
3958 0, gnat_entity, false, false, false, true);
3959 return_by_invisi_ref_p = true;
3962 /* If the return type has a size that overflows, we cannot have
3963 a function that returns that type. This usage doesn't make
3964 sense anyway, so give an error here. */
3965 if (TYPE_SIZE_UNIT (gnu_return_type)
3966 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3967 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3969 post_error ("cannot return type whose size overflows",
3971 gnu_return_type = copy_node (gnu_return_type);
3972 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3973 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3974 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3975 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3978 /* Look at all our parameters and get the type of
3979 each. While doing this, build a copy-out structure if
3982 /* Loop over the parameters and get their associated GCC tree.
3983 While doing this, build a copy-out structure if we need one. */
3984 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
3985 Present (gnat_param);
3986 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3988 tree gnu_param_name = get_entity_name (gnat_param);
3989 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3990 tree gnu_param, gnu_field;
3991 bool copy_in_copy_out = false;
3992 Mechanism_Type mech = Mechanism (gnat_param);
3994 /* Builtins are expanded inline and there is no real call sequence
3995 involved. So the type expected by the underlying expander is
3996 always the type of each argument "as is". */
3997 if (gnu_builtin_decl)
3999 /* Handle the first parameter of a valued procedure specially. */
4000 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
4001 mech = By_Copy_Return;
4002 /* Otherwise, see if a Mechanism was supplied that forced this
4003 parameter to be passed one way or another. */
4004 else if (mech == Default
4005 || mech == By_Copy || mech == By_Reference)
4007 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4008 mech = By_Descriptor;
4010 else if (By_Short_Descriptor_Last <= mech &&
4011 mech <= By_Short_Descriptor)
4012 mech = By_Short_Descriptor;
4016 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4017 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4018 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4020 mech = By_Reference;
4026 post_error ("unsupported mechanism for&", gnat_param);
4031 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4032 Has_Foreign_Convention (gnat_entity),
4035 /* We are returned either a PARM_DECL or a type if no parameter
4036 needs to be passed; in either case, adjust the type. */
4037 if (DECL_P (gnu_param))
4038 gnu_param_type = TREE_TYPE (gnu_param);
4041 gnu_param_type = gnu_param;
4042 gnu_param = NULL_TREE;
4047 /* If it's an exported subprogram, we build a parameter list
4048 in parallel, in case we need to emit a stub for it. */
4049 if (Is_Exported (gnat_entity))
4052 = chainon (gnu_param, gnu_stub_param_list);
4053 /* Change By_Descriptor parameter to By_Reference for
4054 the internal version of an exported subprogram. */
4055 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4058 = gnat_to_gnu_param (gnat_param, By_Reference,
4064 gnu_param = copy_node (gnu_param);
4067 gnu_param_list = chainon (gnu_param, gnu_param_list);
4068 Sloc_to_locus (Sloc (gnat_param),
4069 &DECL_SOURCE_LOCATION (gnu_param));
4070 save_gnu_tree (gnat_param, gnu_param, false);
4072 /* If a parameter is a pointer, this function may modify
4073 memory through it and thus shouldn't be considered
4074 a const function. Also, the memory may be modified
4075 between two calls, so they can't be CSE'ed. The latter
4076 case also handles by-ref parameters. */
4077 if (POINTER_TYPE_P (gnu_param_type)
4078 || TYPE_IS_FAT_POINTER_P (gnu_param_type))
4082 if (copy_in_copy_out)
4084 if (!has_copy_in_out)
4086 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4087 gnu_return_type = make_node (RECORD_TYPE);
4088 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4089 /* Set a default alignment to speed up accesses. */
4090 TYPE_ALIGN (gnu_return_type)
4091 = get_mode_alignment (ptr_mode);
4092 has_copy_in_out = true;
4095 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4096 gnu_return_type, 0, 0, 0, 0);
4097 Sloc_to_locus (Sloc (gnat_param),
4098 &DECL_SOURCE_LOCATION (gnu_field));
4099 TREE_CHAIN (gnu_field) = gnu_field_list;
4100 gnu_field_list = gnu_field;
4102 = tree_cons (gnu_field, gnu_param, gnu_cico_list);
4106 /* Do not compute record for out parameters if subprogram is
4107 stubbed since structures are incomplete for the back-end. */
4108 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4109 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4112 /* If we have a CICO list but it has only one entry, we convert
4113 this function into a function that simply returns that one
4115 if (list_length (gnu_cico_list) == 1)
4116 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list));
4118 if (Has_Stdcall_Convention (gnat_entity))
4119 prepend_one_attribute_to
4120 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4121 get_identifier ("stdcall"), NULL_TREE,
4124 /* If we are on a target where stack realignment is needed for 'main'
4125 to honor GCC's implicit expectations (stack alignment greater than
4126 what the base ABI guarantees), ensure we do the same for foreign
4127 convention subprograms as they might be used as callbacks from code
4128 breaking such expectations. Note that this applies to task entry
4129 points in particular. */
4130 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4131 && Has_Foreign_Convention (gnat_entity))
4132 prepend_one_attribute_to
4133 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4134 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4137 /* The lists have been built in reverse. */
4138 gnu_param_list = nreverse (gnu_param_list);
4140 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4141 gnu_cico_list = nreverse (gnu_cico_list);
4143 if (Ekind (gnat_entity) == E_Function)
4144 Set_Mechanism (gnat_entity, return_unconstrained_p
4145 || return_by_direct_ref_p
4146 || return_by_invisi_ref_p
4147 ? By_Reference : By_Copy);
4149 = create_subprog_type (gnu_return_type, gnu_param_list,
4150 gnu_cico_list, return_unconstrained_p,
4151 return_by_direct_ref_p,
4152 return_by_invisi_ref_p);
4156 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4157 gnu_cico_list, return_unconstrained_p,
4158 return_by_direct_ref_p,
4159 return_by_invisi_ref_p);
4161 /* A subprogram (something that doesn't return anything) shouldn't
4162 be considered const since there would be no reason for such a
4163 subprogram. Note that procedures with Out (or In Out) parameters
4164 have already been converted into a function with a return type. */
4165 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4169 = build_qualified_type (gnu_type,
4170 TYPE_QUALS (gnu_type)
4171 | (TYPE_QUAL_CONST * const_flag)
4172 | (TYPE_QUAL_VOLATILE * volatile_flag));
4174 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4178 = build_qualified_type (gnu_stub_type,
4179 TYPE_QUALS (gnu_stub_type)
4180 | (TYPE_QUAL_CONST * const_flag)
4181 | (TYPE_QUAL_VOLATILE * volatile_flag));
4183 /* If we have a builtin decl for that function, check the signatures
4184 compatibilities. If the signatures are compatible, use the builtin
4185 decl. If they are not, we expect the checker predicate to have
4186 posted the appropriate errors, and just continue with what we have
4188 if (gnu_builtin_decl)
4190 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4192 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4194 gnu_decl = gnu_builtin_decl;
4195 gnu_type = gnu_builtin_type;
4200 /* If there was no specified Interface_Name and the external and
4201 internal names of the subprogram are the same, only use the
4202 internal name to allow disambiguation of nested subprograms. */
4203 if (No (Interface_Name (gnat_entity))
4204 && gnu_ext_name == gnu_entity_name)
4205 gnu_ext_name = NULL_TREE;
4207 /* If we are defining the subprogram and it has an Address clause
4208 we must get the address expression from the saved GCC tree for the
4209 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4210 the address expression here since the front-end has guaranteed
4211 in that case that the elaboration has no effects. If there is
4212 an Address clause and we are not defining the object, just
4213 make it a constant. */
4214 if (Present (Address_Clause (gnat_entity)))
4216 tree gnu_address = NULL_TREE;
4220 = (present_gnu_tree (gnat_entity)
4221 ? get_gnu_tree (gnat_entity)
4222 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4224 save_gnu_tree (gnat_entity, NULL_TREE, false);
4226 /* Convert the type of the object to a reference type that can
4227 alias everything as per 13.3(19). */
4229 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4231 gnu_address = convert (gnu_type, gnu_address);
4234 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4235 gnu_address, false, Is_Public (gnat_entity),
4236 extern_flag, false, NULL, gnat_entity);
4237 DECL_BY_REF_P (gnu_decl) = 1;
4240 else if (kind == E_Subprogram_Type)
4241 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4242 !Comes_From_Source (gnat_entity),
4243 debug_info_p, gnat_entity);
4248 gnu_stub_name = gnu_ext_name;
4249 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4250 public_flag = false;
4253 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4254 gnu_type, gnu_param_list,
4255 inline_flag, public_flag,
4256 extern_flag, attr_list,
4261 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4262 gnu_stub_type, gnu_stub_param_list,
4264 extern_flag, attr_list,
4266 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4269 /* This is unrelated to the stub built right above. */
4270 DECL_STUBBED_P (gnu_decl)
4271 = Convention (gnat_entity) == Convention_Stubbed;
4276 case E_Incomplete_Type:
4277 case E_Incomplete_Subtype:
4278 case E_Private_Type:
4279 case E_Private_Subtype:
4280 case E_Limited_Private_Type:
4281 case E_Limited_Private_Subtype:
4282 case E_Record_Type_With_Private:
4283 case E_Record_Subtype_With_Private:
4285 /* Get the "full view" of this entity. If this is an incomplete
4286 entity from a limited with, treat its non-limited view as the
4287 full view. Otherwise, use either the full view or the underlying
4288 full view, whichever is present. This is used in all the tests
4291 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4292 && From_With_Type (gnat_entity))
4293 ? Non_Limited_View (gnat_entity)
4294 : Present (Full_View (gnat_entity))
4295 ? Full_View (gnat_entity)
4296 : Underlying_Full_View (gnat_entity);
4298 /* If this is an incomplete type with no full view, it must be a Taft
4299 Amendment type, in which case we return a dummy type. Otherwise,
4300 just get the type from its Etype. */
4303 if (kind == E_Incomplete_Type)
4305 gnu_type = make_dummy_type (gnat_entity);
4306 gnu_decl = TYPE_STUB_DECL (gnu_type);
4310 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4312 maybe_present = true;
4317 /* If we already made a type for the full view, reuse it. */
4318 else if (present_gnu_tree (full_view))
4320 gnu_decl = get_gnu_tree (full_view);
4324 /* Otherwise, if we are not defining the type now, get the type
4325 from the full view. But always get the type from the full view
4326 for define on use types, since otherwise we won't see them! */
4327 else if (!definition
4328 || (Is_Itype (full_view)
4329 && No (Freeze_Node (gnat_entity)))
4330 || (Is_Itype (gnat_entity)
4331 && No (Freeze_Node (full_view))))
4333 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4334 maybe_present = true;
4338 /* For incomplete types, make a dummy type entry which will be
4339 replaced later. Save it as the full declaration's type so
4340 we can do any needed updates when we see it. */
4341 gnu_type = make_dummy_type (gnat_entity);
4342 gnu_decl = TYPE_STUB_DECL (gnu_type);
4343 save_gnu_tree (full_view, gnu_decl, 0);
4347 /* Simple class_wide types are always viewed as their root_type
4348 by Gigi unless an Equivalent_Type is specified. */
4349 case E_Class_Wide_Type:
4350 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4351 maybe_present = true;
4355 case E_Task_Subtype:
4356 case E_Protected_Type:
4357 case E_Protected_Subtype:
4358 if (type_annotate_only && No (gnat_equiv_type))
4359 gnu_type = void_type_node;
4361 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4363 maybe_present = true;
4367 gnu_decl = create_label_decl (gnu_entity_name);
4372 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4373 we've already saved it, so we don't try to. */
4374 gnu_decl = error_mark_node;
4382 /* If we had a case where we evaluated another type and it might have
4383 defined this one, handle it here. */
4384 if (maybe_present && present_gnu_tree (gnat_entity))
4386 gnu_decl = get_gnu_tree (gnat_entity);
4390 /* If we are processing a type and there is either no decl for it or
4391 we just made one, do some common processing for the type, such as
4392 handling alignment and possible padding. */
4393 if (is_type && (!gnu_decl || this_made_decl))
4395 if (Is_Tagged_Type (gnat_entity)
4396 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4397 TYPE_ALIGN_OK (gnu_type) = 1;
4399 /* If the type is passed by reference, objects of this type must be
4400 fully addressable and cannot be copied. */
4401 if (Is_By_Reference_Type (gnat_entity))
4402 TREE_ADDRESSABLE (gnu_type) = 1;
4404 /* ??? Don't set the size for a String_Literal since it is either
4405 confirming or we don't handle it properly (if the low bound is
4407 if (!gnu_size && kind != E_String_Literal_Subtype)
4408 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4410 Has_Size_Clause (gnat_entity));
4412 /* If a size was specified, see if we can make a new type of that size
4413 by rearranging the type, for example from a fat to a thin pointer. */
4417 = make_type_from_size (gnu_type, gnu_size,
4418 Has_Biased_Representation (gnat_entity));
4420 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4421 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4425 /* If the alignment hasn't already been processed and this is
4426 not an unconstrained array, see if an alignment is specified.
4427 If not, we pick a default alignment for atomic objects. */
4428 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4430 else if (Known_Alignment (gnat_entity))
4432 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4433 TYPE_ALIGN (gnu_type));
4435 /* Warn on suspiciously large alignments. This should catch
4436 errors about the (alignment,byte)/(size,bit) discrepancy. */
4437 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4441 /* If a size was specified, take it into account. Otherwise
4442 use the RM size for records as the type size has already
4443 been adjusted to the alignment. */
4446 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4447 || TREE_CODE (gnu_type) == UNION_TYPE
4448 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4449 && !TYPE_FAT_POINTER_P (gnu_type))
4450 size = rm_size (gnu_type);
4452 size = TYPE_SIZE (gnu_type);
4454 /* Consider an alignment as suspicious if the alignment/size
4455 ratio is greater or equal to the byte/bit ratio. */
4456 if (host_integerp (size, 1)
4457 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4458 post_error_ne ("?suspiciously large alignment specified for&",
4459 Expression (Alignment_Clause (gnat_entity)),
4463 else if (Is_Atomic (gnat_entity) && !gnu_size
4464 && host_integerp (TYPE_SIZE (gnu_type), 1)
4465 && integer_pow2p (TYPE_SIZE (gnu_type)))
4466 align = MIN (BIGGEST_ALIGNMENT,
4467 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4468 else if (Is_Atomic (gnat_entity) && gnu_size
4469 && host_integerp (gnu_size, 1)
4470 && integer_pow2p (gnu_size))
4471 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4473 /* See if we need to pad the type. If we did, and made a record,
4474 the name of the new type may be changed. So get it back for
4475 us when we make the new TYPE_DECL below. */
4476 if (gnu_size || align > 0)
4477 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4478 false, !gnu_decl, definition, false);
4480 if (TYPE_IS_PADDING_P (gnu_type))
4482 gnu_entity_name = TYPE_NAME (gnu_type);
4483 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4484 gnu_entity_name = DECL_NAME (gnu_entity_name);
4487 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4489 /* If we are at global level, GCC will have applied variable_size to
4490 the type, but that won't have done anything. So, if it's not
4491 a constant or self-referential, call elaborate_expression_1 to
4492 make a variable for the size rather than calculating it each time.
4493 Handle both the RM size and the actual size. */
4494 if (global_bindings_p ()
4495 && TYPE_SIZE (gnu_type)
4496 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4497 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4499 if (TREE_CODE (gnu_type) == RECORD_TYPE
4500 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4501 TYPE_SIZE (gnu_type), 0))
4503 TYPE_SIZE (gnu_type)
4504 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4505 gnat_entity, get_identifier ("SIZE"),
4507 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4511 TYPE_SIZE (gnu_type)
4512 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4513 gnat_entity, get_identifier ("SIZE"),
4516 /* ??? For now, store the size as a multiple of the alignment
4517 in bytes so that we can see the alignment from the tree. */
4518 TYPE_SIZE_UNIT (gnu_type)
4520 (MULT_EXPR, sizetype,
4521 elaborate_expression_1
4522 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4523 TYPE_SIZE_UNIT (gnu_type),
4524 size_int (TYPE_ALIGN (gnu_type)
4526 gnat_entity, get_identifier ("SIZE_A_UNIT"),
4528 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4530 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4533 elaborate_expression_1 (TYPE_ADA_SIZE (gnu_type),
4535 get_identifier ("RM_SIZE"),
4536 definition, false));
4540 /* If this is a record type or subtype, call elaborate_expression_1 on
4541 any field position. Do this for both global and local types.
4542 Skip any fields that we haven't made trees for to avoid problems with
4543 class wide types. */
4544 if (IN (kind, Record_Kind))
4545 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4546 gnat_temp = Next_Entity (gnat_temp))
4547 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4549 tree gnu_field = get_gnu_tree (gnat_temp);
4551 /* ??? Unfortunately, GCC needs to be able to prove the
4552 alignment of this offset and if it's a variable, it can't.
4553 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4554 right now, we have to put in an explicit multiply and
4555 divide by that value. */
4556 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4558 DECL_FIELD_OFFSET (gnu_field)
4560 (MULT_EXPR, sizetype,
4561 elaborate_expression_1
4562 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4563 DECL_FIELD_OFFSET (gnu_field),
4564 size_int (DECL_OFFSET_ALIGN (gnu_field)
4566 gnat_temp, get_identifier ("OFFSET"),
4568 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4570 /* ??? The context of gnu_field is not necessarily gnu_type so
4571 the MULT_EXPR node built above may not be marked by the call
4572 to create_type_decl below. */
4573 if (global_bindings_p ())
4574 MARK_VISITED (DECL_FIELD_OFFSET (gnu_field));
4578 if (Treat_As_Volatile (gnat_entity))
4580 = build_qualified_type (gnu_type,
4581 TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
4583 if (Is_Atomic (gnat_entity))
4584 check_ok_for_atomic (gnu_type, gnat_entity, false);
4586 if (Present (Alignment_Clause (gnat_entity)))
4587 TYPE_USER_ALIGN (gnu_type) = 1;
4589 if (Universal_Aliasing (gnat_entity))
4590 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4593 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4594 !Comes_From_Source (gnat_entity),
4595 debug_info_p, gnat_entity);
4598 TREE_TYPE (gnu_decl) = gnu_type;
4599 TYPE_STUB_DECL (gnu_type) = gnu_decl;
4603 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4605 gnu_type = TREE_TYPE (gnu_decl);
4607 /* If this is a derived type, relate its alias set to that of its parent
4608 to avoid troubles when a call to an inherited primitive is inlined in
4609 a context where a derived object is accessed. The inlined code works
4610 on the parent view so the resulting code may access the same object
4611 using both the parent and the derived alias sets, which thus have to
4612 conflict. As the same issue arises with component references, the
4613 parent alias set also has to conflict with composite types enclosing
4614 derived components. For instance, if we have:
4621 we want T to conflict with both D and R, in addition to R being a
4622 superset of D by record/component construction.
4624 One way to achieve this is to perform an alias set copy from the
4625 parent to the derived type. This is not quite appropriate, though,
4626 as we don't want separate derived types to conflict with each other:
4628 type I1 is new Integer;
4629 type I2 is new Integer;
4631 We want I1 and I2 to both conflict with Integer but we do not want
4632 I1 to conflict with I2, and an alias set copy on derivation would
4635 The option chosen is to make the alias set of the derived type a
4636 superset of that of its parent type. It trivially fulfills the
4637 simple requirement for the Integer derivation example above, and
4638 the component case as well by superset transitivity:
4641 R ----------> D ----------> T
4643 However, for composite types, conversions between derived types are
4644 translated into VIEW_CONVERT_EXPRs so a sequence like:
4646 type Comp1 is new Comp;
4647 type Comp2 is new Comp;
4648 procedure Proc (C : Comp1);
4656 Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C));
4658 and gimplified into:
4665 i.e. generates code involving type punning. Therefore, Comp1 needs
4666 to conflict with Comp2 and an alias set copy is required.
4668 The language rules ensure the parent type is already frozen here. */
4669 if (Is_Derived_Type (gnat_entity))
4671 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4672 relate_alias_sets (gnu_type, gnu_parent_type,
4673 Is_Composite_Type (gnat_entity)
4674 ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET);
4677 /* Back-annotate the Alignment of the type if not already in the
4678 tree. Likewise for sizes. */
4679 if (Unknown_Alignment (gnat_entity))
4681 unsigned int double_align, align;
4682 bool is_capped_double, align_clause;
4684 /* If the default alignment of "double" or larger scalar types is
4685 specifically capped and this is not an array with an alignment
4686 clause on the component type, return the cap. */
4687 if ((double_align = double_float_alignment) > 0)
4689 = is_double_float_or_array (gnat_entity, &align_clause);
4690 else if ((double_align = double_scalar_alignment) > 0)
4692 = is_double_scalar_or_array (gnat_entity, &align_clause);
4694 is_capped_double = align_clause = false;
4696 if (is_capped_double && !align_clause)
4697 align = double_align;
4699 align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
4701 Set_Alignment (gnat_entity, UI_From_Int (align));
4704 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4706 /* If the size is self-referential, we annotate the maximum
4707 value of that size. */
4708 tree gnu_size = TYPE_SIZE (gnu_type);
4710 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4711 gnu_size = max_size (gnu_size, true);
4713 Set_Esize (gnat_entity, annotate_value (gnu_size));
4715 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4717 /* In this mode the tag and the parent components are not
4718 generated by the front-end, so the sizes must be adjusted
4720 int size_offset, new_size;
4722 if (Is_Derived_Type (gnat_entity))
4725 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4726 Set_Alignment (gnat_entity,
4727 Alignment (Etype (Base_Type (gnat_entity))));
4730 size_offset = POINTER_SIZE;
4732 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4733 Set_Esize (gnat_entity,
4734 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4735 / POINTER_SIZE) * POINTER_SIZE));
4736 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4740 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4741 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4744 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4745 DECL_ARTIFICIAL (gnu_decl) = 1;
4747 if (!debug_info_p && DECL_P (gnu_decl)
4748 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4749 && No (Renamed_Object (gnat_entity)))
4750 DECL_IGNORED_P (gnu_decl) = 1;
4752 /* If we haven't already, associate the ..._DECL node that we just made with
4753 the input GNAT entity node. */
4755 save_gnu_tree (gnat_entity, gnu_decl, false);
4757 /* If this is an enumeration or floating-point type, we were not able to set
4758 the bounds since they refer to the type. These are always static. */
4759 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4760 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4762 tree gnu_scalar_type = gnu_type;
4763 tree gnu_low_bound, gnu_high_bound;
4765 /* If this is a padded type, we need to use the underlying type. */
4766 if (TYPE_IS_PADDING_P (gnu_scalar_type))
4767 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4769 /* If this is a floating point type and we haven't set a floating
4770 point type yet, use this in the evaluation of the bounds. */
4771 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4772 longest_float_type_node = gnu_scalar_type;
4774 gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4775 gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity));
4777 if (kind == E_Enumeration_Type)
4779 /* Enumeration types have specific RM bounds. */
4780 SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound);
4781 SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound);
4783 /* Write full debugging information. Since this has both a
4784 typedef and a tag, avoid outputting the name twice. */
4785 DECL_ARTIFICIAL (gnu_decl) = 1;
4786 rest_of_type_decl_compilation (gnu_decl);
4791 /* Floating-point types don't have specific RM bounds. */
4792 TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound;
4793 TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound;
4797 /* If we deferred processing of incomplete types, re-enable it. If there
4798 were no other disables and we have some to process, do so. */
4799 if (this_deferred && --defer_incomplete_level == 0)
4801 if (defer_incomplete_list)
4803 struct incomplete *incp, *next;
4805 /* We are back to level 0 for the deferring of incomplete types.
4806 But processing these incomplete types below may itself require
4807 deferring, so preserve what we have and restart from scratch. */
4808 incp = defer_incomplete_list;
4809 defer_incomplete_list = NULL;
4811 /* For finalization, however, all types must be complete so we
4812 cannot do the same because deferred incomplete types may end up
4813 referencing each other. Process them all recursively first. */
4814 defer_finalize_level++;
4816 for (; incp; incp = next)
4821 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4822 gnat_to_gnu_type (incp->full_type));
4826 defer_finalize_level--;
4829 /* All the deferred incomplete types have been processed so we can
4830 now proceed with the finalization of the deferred types. */
4831 if (defer_finalize_level == 0 && defer_finalize_list)
4836 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4837 rest_of_type_decl_compilation_no_defer (t);
4839 VEC_free (tree, heap, defer_finalize_list);
4843 /* If we are not defining this type, see if it's in the incomplete list.
4844 If so, handle that list entry now. */
4845 else if (!definition)
4847 struct incomplete *incp;
4849 for (incp = defer_incomplete_list; incp; incp = incp->next)
4850 if (incp->old_type && incp->full_type == gnat_entity)
4852 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4853 TREE_TYPE (gnu_decl));
4854 incp->old_type = NULL_TREE;
4861 /* If this is a packed array type whose original array type is itself
4862 an Itype without freeze node, make sure the latter is processed. */
4863 if (Is_Packed_Array_Type (gnat_entity)
4864 && Is_Itype (Original_Array_Type (gnat_entity))
4865 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4866 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4867 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4872 /* Similar, but if the returned value is a COMPONENT_REF, return the
4876 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4878 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4880 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4881 gnu_field = TREE_OPERAND (gnu_field, 1);
4886 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4887 the GCC type corresponding to that entity. */
4890 gnat_to_gnu_type (Entity_Id gnat_entity)
4894 /* The back end never attempts to annotate generic types. */
4895 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4896 return void_type_node;
4898 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4899 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4901 return TREE_TYPE (gnu_decl);
4904 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4905 the unpadded version of the GCC type corresponding to that entity. */
4908 get_unpadded_type (Entity_Id gnat_entity)
4910 tree type = gnat_to_gnu_type (gnat_entity);
4912 if (TYPE_IS_PADDING_P (type))
4913 type = TREE_TYPE (TYPE_FIELDS (type));
4918 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4919 Every TYPE_DECL generated for a type definition must be passed
4920 to this function once everything else has been done for it. */
4923 rest_of_type_decl_compilation (tree decl)
4925 /* We need to defer finalizing the type if incomplete types
4926 are being deferred or if they are being processed. */
4927 if (defer_incomplete_level || defer_finalize_level)
4928 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4930 rest_of_type_decl_compilation_no_defer (decl);
4933 /* Same as above but without deferring the compilation. This
4934 function should not be invoked directly on a TYPE_DECL. */
4937 rest_of_type_decl_compilation_no_defer (tree decl)
4939 const int toplev = global_bindings_p ();
4940 tree t = TREE_TYPE (decl);
4942 rest_of_decl_compilation (decl, toplev, 0);
4944 /* Now process all the variants. This is needed for STABS. */
4945 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4947 if (t == TREE_TYPE (decl))
4950 if (!TYPE_STUB_DECL (t))
4951 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4953 rest_of_type_compilation (t, toplev);
4957 /* Finalize any From_With_Type incomplete types. We do this after processing
4958 our compilation unit and after processing its spec, if this is a body. */
4961 finalize_from_with_types (void)
4963 struct incomplete *incp = defer_limited_with;
4964 struct incomplete *next;
4966 defer_limited_with = 0;
4967 for (; incp; incp = next)
4971 if (incp->old_type != 0)
4972 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4973 gnat_to_gnu_type (incp->full_type));
4978 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4979 kind of type (such E_Task_Type) that has a different type which Gigi
4980 uses for its representation. If the type does not have a special type
4981 for its representation, return GNAT_ENTITY. If a type is supposed to
4982 exist, but does not, abort unless annotating types, in which case
4983 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4986 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4988 Entity_Id gnat_equiv = gnat_entity;
4990 if (No (gnat_entity))
4993 switch (Ekind (gnat_entity))
4995 case E_Class_Wide_Subtype:
4996 if (Present (Equivalent_Type (gnat_entity)))
4997 gnat_equiv = Equivalent_Type (gnat_entity);
5000 case E_Access_Protected_Subprogram_Type:
5001 case E_Anonymous_Access_Protected_Subprogram_Type:
5002 gnat_equiv = Equivalent_Type (gnat_entity);
5005 case E_Class_Wide_Type:
5006 gnat_equiv = Root_Type (gnat_entity);
5010 case E_Task_Subtype:
5011 case E_Protected_Type:
5012 case E_Protected_Subtype:
5013 gnat_equiv = Corresponding_Record_Type (gnat_entity);
5020 gcc_assert (Present (gnat_equiv) || type_annotate_only);
5024 /* Return a GCC tree for a type corresponding to the component type of the
5025 array type or subtype GNAT_ARRAY. DEFINITION is true if this component
5026 is for an array being defined. DEBUG_INFO_P is true if we need to write
5027 debug information for other types that we may create in the process. */
5030 gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition,
5033 tree gnu_type = gnat_to_gnu_type (Component_Type (gnat_array));
5036 /* Try to get a smaller form of the component if needed. */
5037 if ((Is_Packed (gnat_array)
5038 || Has_Component_Size_Clause (gnat_array))
5039 && !Is_Bit_Packed_Array (gnat_array)
5040 && !Has_Aliased_Components (gnat_array)
5041 && !Strict_Alignment (Component_Type (gnat_array))
5042 && TREE_CODE (gnu_type) == RECORD_TYPE
5043 && !TYPE_FAT_POINTER_P (gnu_type)
5044 && host_integerp (TYPE_SIZE (gnu_type), 1))
5045 gnu_type = make_packable_type (gnu_type, false);
5047 if (Has_Atomic_Components (gnat_array))
5048 check_ok_for_atomic (gnu_type, gnat_array, true);
5050 /* Get and validate any specified Component_Size. */
5052 = validate_size (Component_Size (gnat_array), gnu_type, gnat_array,
5053 Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL,
5054 true, Has_Component_Size_Clause (gnat_array));
5056 /* If the array has aliased components and the component size can be zero,
5057 force at least unit size to ensure that the components have distinct
5060 && Has_Aliased_Components (gnat_array)
5061 && (integer_zerop (TYPE_SIZE (gnu_type))
5062 || (TREE_CODE (gnu_type) == ARRAY_TYPE
5063 && !TREE_CONSTANT (TYPE_SIZE (gnu_type)))))
5065 = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node);
5067 /* If the component type is a RECORD_TYPE that has a self-referential size,
5068 then use the maximum size for the component size. */
5070 && TREE_CODE (gnu_type) == RECORD_TYPE
5071 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
5072 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
5074 /* Honor the component size. This is not needed for bit-packed arrays. */
5075 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array))
5077 tree orig_type = gnu_type;
5078 unsigned int max_align;
5080 /* If an alignment is specified, use it as a cap on the component type
5081 so that it can be honored for the whole type. But ignore it for the
5082 original type of packed array types. */
5083 if (No (Packed_Array_Type (gnat_array)) && Known_Alignment (gnat_array))
5084 max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0);
5088 gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false);
5089 if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
5090 gnu_type = orig_type;
5092 orig_type = gnu_type;
5094 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array,
5095 true, false, definition, true);
5097 /* If a padding record was made, declare it now since it will never be
5098 declared otherwise. This is necessary to ensure that its subtrees
5099 are properly marked. */
5100 if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type)))
5101 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true,
5102 debug_info_p, gnat_array);
5105 if (Has_Volatile_Components (Base_Type (gnat_array)))
5107 = build_qualified_type (gnu_type,
5108 TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
5113 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
5114 using MECH as its passing mechanism, to be placed in the parameter
5115 list built for GNAT_SUBPROG. Assume a foreign convention for the
5116 latter if FOREIGN is true. Also set CICO to true if the parameter
5117 must use the copy-in copy-out implementation mechanism.
5119 The returned tree is a PARM_DECL, except for those cases where no
5120 parameter needs to be actually passed to the subprogram; the type
5121 of this "shadow" parameter is then returned instead. */
5124 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
5125 Entity_Id gnat_subprog, bool foreign, bool *cico)
5127 tree gnu_param_name = get_entity_name (gnat_param);
5128 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
5129 tree gnu_param_type_alt = NULL_TREE;
5130 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
5131 /* The parameter can be indirectly modified if its address is taken. */
5132 bool ro_param = in_param && !Address_Taken (gnat_param);
5133 bool by_return = false, by_component_ptr = false, by_ref = false;
5136 /* Copy-return is used only for the first parameter of a valued procedure.
5137 It's a copy mechanism for which a parameter is never allocated. */
5138 if (mech == By_Copy_Return)
5140 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5145 /* If this is either a foreign function or if the underlying type won't
5146 be passed by reference, strip off possible padding type. */
5147 if (TYPE_IS_PADDING_P (gnu_param_type))
5149 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5151 if (mech == By_Reference
5153 || (!must_pass_by_ref (unpadded_type)
5154 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5155 gnu_param_type = unpadded_type;
5158 /* If this is a read-only parameter, make a variant of the type that is
5159 read-only. ??? However, if this is an unconstrained array, that type
5160 can be very complex, so skip it for now. Likewise for any other
5161 self-referential type. */
5163 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5164 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5165 gnu_param_type = build_qualified_type (gnu_param_type,
5166 (TYPE_QUALS (gnu_param_type)
5167 | TYPE_QUAL_CONST));
5169 /* For foreign conventions, pass arrays as pointers to the element type.
5170 First check for unconstrained array and get the underlying array. */
5171 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5173 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5175 /* VMS descriptors are themselves passed by reference. */
5176 if (mech == By_Short_Descriptor ||
5177 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5179 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5180 Mechanism (gnat_param),
5182 else if (mech == By_Descriptor)
5184 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5185 chosen in fill_vms_descriptor. */
5187 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5188 Mechanism (gnat_param),
5191 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5192 Mechanism (gnat_param),
5196 /* Arrays are passed as pointers to element type for foreign conventions. */
5199 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5201 /* Strip off any multi-dimensional entries, then strip
5202 off the last array to get the component type. */
5203 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5204 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5205 gnu_param_type = TREE_TYPE (gnu_param_type);
5207 by_component_ptr = true;
5208 gnu_param_type = TREE_TYPE (gnu_param_type);
5211 gnu_param_type = build_qualified_type (gnu_param_type,
5212 (TYPE_QUALS (gnu_param_type)
5213 | TYPE_QUAL_CONST));
5215 gnu_param_type = build_pointer_type (gnu_param_type);
5218 /* Fat pointers are passed as thin pointers for foreign conventions. */
5219 else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type))
5221 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5223 /* If we must pass or were requested to pass by reference, do so.
5224 If we were requested to pass by copy, do so.
5225 Otherwise, for foreign conventions, pass In Out or Out parameters
5226 or aggregates by reference. For COBOL and Fortran, pass all
5227 integer and FP types that way too. For Convention Ada, use
5228 the standard Ada default. */
5229 else if (must_pass_by_ref (gnu_param_type)
5230 || mech == By_Reference
5233 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5235 && (Convention (gnat_subprog) == Convention_Fortran
5236 || Convention (gnat_subprog) == Convention_COBOL)
5237 && (INTEGRAL_TYPE_P (gnu_param_type)
5238 || FLOAT_TYPE_P (gnu_param_type)))
5240 && default_pass_by_ref (gnu_param_type)))))
5242 gnu_param_type = build_reference_type (gnu_param_type);
5246 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5250 if (mech == By_Copy && (by_ref || by_component_ptr))
5251 post_error ("?cannot pass & by copy", gnat_param);
5253 /* If this is an Out parameter that isn't passed by reference and isn't
5254 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5255 it will be a VAR_DECL created when we process the procedure, so just
5256 return its type. For the special parameter of a valued procedure,
5259 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5260 Out parameters with discriminants or implicit initial values to be
5261 handled like In Out parameters. These type are normally built as
5262 aggregates, hence passed by reference, except for some packed arrays
5263 which end up encoded in special integer types.
5265 The exception we need to make is then for packed arrays of records
5266 with discriminants or implicit initial values. We have no light/easy
5267 way to check for the latter case, so we merely check for packed arrays
5268 of records. This may lead to useless copy-in operations, but in very
5269 rare cases only, as these would be exceptions in a set of already
5270 exceptional situations. */
5271 if (Ekind (gnat_param) == E_Out_Parameter
5274 || (mech != By_Descriptor
5275 && mech != By_Short_Descriptor
5276 && !POINTER_TYPE_P (gnu_param_type)
5277 && !AGGREGATE_TYPE_P (gnu_param_type)))
5278 && !(Is_Array_Type (Etype (gnat_param))
5279 && Is_Packed (Etype (gnat_param))
5280 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5281 return gnu_param_type;
5283 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5284 ro_param || by_ref || by_component_ptr);
5285 DECL_BY_REF_P (gnu_param) = by_ref;
5286 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5287 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5288 mech == By_Short_Descriptor);
5289 DECL_POINTS_TO_READONLY_P (gnu_param)
5290 = (ro_param && (by_ref || by_component_ptr));
5292 /* Save the alternate descriptor type, if any. */
5293 if (gnu_param_type_alt)
5294 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5296 /* If no Mechanism was specified, indicate what we're using, then
5297 back-annotate it. */
5298 if (mech == Default)
5299 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5301 Set_Mechanism (gnat_param, mech);
5305 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5308 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5310 while (Present (Corresponding_Discriminant (discr1)))
5311 discr1 = Corresponding_Discriminant (discr1);
5313 while (Present (Corresponding_Discriminant (discr2)))
5314 discr2 = Corresponding_Discriminant (discr2);
5317 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5320 /* Return true if the array type GNU_TYPE, which represents a dimension of
5321 GNAT_TYPE, has a non-aliased component in the back-end sense. */
5324 array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type)
5326 /* If the array type is not the innermost dimension of the GNAT type,
5327 then it has a non-aliased component. */
5328 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5329 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5332 /* If the array type has an aliased component in the front-end sense,
5333 then it also has an aliased component in the back-end sense. */
5334 if (Has_Aliased_Components (gnat_type))
5337 /* If this is a derived type, then it has a non-aliased component if
5338 and only if its parent type also has one. */
5339 if (Is_Derived_Type (gnat_type))
5341 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type));
5343 if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE)
5345 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type))));
5346 for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--)
5347 gnu_parent_type = TREE_TYPE (gnu_parent_type);
5348 return TYPE_NONALIASED_COMPONENT (gnu_parent_type);
5351 /* Otherwise, rely exclusively on properties of the element type. */
5352 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5355 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5358 compile_time_known_address_p (Node_Id gnat_address)
5360 /* Catch System'To_Address. */
5361 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5362 gnat_address = Expression (gnat_address);
5364 return Compile_Time_Known_Value (gnat_address);
5367 /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e.
5368 cannot verify HB < LB-1 when LB and HB are the low and high bounds. */
5371 cannot_be_superflat_p (Node_Id gnat_range)
5373 Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range);
5374 Node_Id scalar_range;
5376 tree gnu_lb, gnu_hb;
5378 /* If the low bound is not constant, try to find an upper bound. */
5379 while (Nkind (gnat_lb) != N_Integer_Literal
5380 && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype
5381 || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype)
5382 && (scalar_range = Scalar_Range (Etype (gnat_lb)))
5383 && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
5384 || Nkind (scalar_range) == N_Range))
5385 gnat_lb = High_Bound (scalar_range);
5387 /* If the high bound is not constant, try to find a lower bound. */
5388 while (Nkind (gnat_hb) != N_Integer_Literal
5389 && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype
5390 || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype)
5391 && (scalar_range = Scalar_Range (Etype (gnat_hb)))
5392 && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
5393 || Nkind (scalar_range) == N_Range))
5394 gnat_hb = Low_Bound (scalar_range);
5396 if (!(Nkind (gnat_lb) == N_Integer_Literal
5397 && Nkind (gnat_hb) == N_Integer_Literal))
5400 gnu_lb = UI_To_gnu (Intval (gnat_lb), bitsizetype);
5401 gnu_hb = UI_To_gnu (Intval (gnat_hb), bitsizetype);
5403 /* If the low bound is the smallest integer, nothing can be smaller. */
5404 gnu_lb = size_binop (MINUS_EXPR, gnu_lb, bitsize_one_node);
5405 if (TREE_OVERFLOW (gnu_lb))
5408 return (tree_int_cst_lt (gnu_hb, gnu_lb) == 0);
5411 /* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */
5414 constructor_address_p (tree gnu_expr)
5416 while (TREE_CODE (gnu_expr) == NOP_EXPR
5417 || TREE_CODE (gnu_expr) == CONVERT_EXPR
5418 || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR)
5419 gnu_expr = TREE_OPERAND (gnu_expr, 0);
5421 return (TREE_CODE (gnu_expr) == ADDR_EXPR
5422 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR);
5425 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5426 be elaborated at the point of its definition, but do nothing else. */
5429 elaborate_entity (Entity_Id gnat_entity)
5431 switch (Ekind (gnat_entity))
5433 case E_Signed_Integer_Subtype:
5434 case E_Modular_Integer_Subtype:
5435 case E_Enumeration_Subtype:
5436 case E_Ordinary_Fixed_Point_Subtype:
5437 case E_Decimal_Fixed_Point_Subtype:
5438 case E_Floating_Point_Subtype:
5440 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5441 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5443 /* ??? Tests to avoid Constraint_Error in static expressions
5444 are needed until after the front stops generating bogus
5445 conversions on bounds of real types. */
5446 if (!Raises_Constraint_Error (gnat_lb))
5447 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5448 true, false, Needs_Debug_Info (gnat_entity));
5449 if (!Raises_Constraint_Error (gnat_hb))
5450 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5451 true, false, Needs_Debug_Info (gnat_entity));
5457 Node_Id full_definition = Declaration_Node (gnat_entity);
5458 Node_Id record_definition = Type_Definition (full_definition);
5460 /* If this is a record extension, go a level further to find the
5461 record definition. */
5462 if (Nkind (record_definition) == N_Derived_Type_Definition)
5463 record_definition = Record_Extension_Part (record_definition);
5467 case E_Record_Subtype:
5468 case E_Private_Subtype:
5469 case E_Limited_Private_Subtype:
5470 case E_Record_Subtype_With_Private:
5471 if (Is_Constrained (gnat_entity)
5472 && Has_Discriminants (gnat_entity)
5473 && Present (Discriminant_Constraint (gnat_entity)))
5475 Node_Id gnat_discriminant_expr;
5476 Entity_Id gnat_field;
5479 = First_Discriminant (Implementation_Base_Type (gnat_entity)),
5480 gnat_discriminant_expr
5481 = First_Elmt (Discriminant_Constraint (gnat_entity));
5482 Present (gnat_field);
5483 gnat_field = Next_Discriminant (gnat_field),
5484 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5485 /* ??? For now, ignore access discriminants. */
5486 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5487 elaborate_expression (Node (gnat_discriminant_expr),
5488 gnat_entity, get_entity_name (gnat_field),
5489 true, false, false);
5496 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5497 any entities on its entity chain similarly. */
5500 mark_out_of_scope (Entity_Id gnat_entity)
5502 Entity_Id gnat_sub_entity;
5503 unsigned int kind = Ekind (gnat_entity);
5505 /* If this has an entity list, process all in the list. */
5506 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5507 || IN (kind, Private_Kind)
5508 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5509 || kind == E_Function || kind == E_Generic_Function
5510 || kind == E_Generic_Package || kind == E_Generic_Procedure
5511 || kind == E_Loop || kind == E_Operator || kind == E_Package
5512 || kind == E_Package_Body || kind == E_Procedure
5513 || kind == E_Record_Type || kind == E_Record_Subtype
5514 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5515 for (gnat_sub_entity = First_Entity (gnat_entity);
5516 Present (gnat_sub_entity);
5517 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5518 if (Scope (gnat_sub_entity) == gnat_entity
5519 && gnat_sub_entity != gnat_entity)
5520 mark_out_of_scope (gnat_sub_entity);
5522 /* Now clear this if it has been defined, but only do so if it isn't
5523 a subprogram or parameter. We could refine this, but it isn't
5524 worth it. If this is statically allocated, it is supposed to
5525 hang around out of cope. */
5526 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5527 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5529 save_gnu_tree (gnat_entity, NULL_TREE, true);
5530 save_gnu_tree (gnat_entity, error_mark_node, true);
5534 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5535 If this is a multi-dimensional array type, do this recursively.
5538 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5539 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5540 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5543 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5545 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5546 of a one-dimensional array, since the padding has the same alias set
5547 as the field type, but if it's a multi-dimensional array, we need to
5548 see the inner types. */
5549 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5550 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5551 || TYPE_PADDING_P (gnu_old_type)))
5552 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5554 /* Unconstrained array types are deemed incomplete and would thus be given
5555 alias set 0. Retrieve the underlying array type. */
5556 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5558 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5559 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5561 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5563 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5564 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5565 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5566 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5570 case ALIAS_SET_COPY:
5571 /* The alias set shouldn't be copied between array types with different
5572 aliasing settings because this can break the aliasing relationship
5573 between the array type and its element type. */
5574 #ifndef ENABLE_CHECKING
5575 if (flag_strict_aliasing)
5577 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5578 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5579 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5580 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5582 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5585 case ALIAS_SET_SUBSET:
5586 case ALIAS_SET_SUPERSET:
5588 alias_set_type old_set = get_alias_set (gnu_old_type);
5589 alias_set_type new_set = get_alias_set (gnu_new_type);
5591 /* Do nothing if the alias sets conflict. This ensures that we
5592 never call record_alias_subset several times for the same pair
5593 or at all for alias set 0. */
5594 if (!alias_sets_conflict_p (old_set, new_set))
5596 if (op == ALIAS_SET_SUBSET)
5597 record_alias_subset (old_set, new_set);
5599 record_alias_subset (new_set, old_set);
5608 record_component_aliases (gnu_new_type);
5611 /* Return true if the size represented by GNU_SIZE can be handled by an
5612 allocation. If STATIC_P is true, consider only what can be done with a
5613 static allocation. */
5616 allocatable_size_p (tree gnu_size, bool static_p)
5618 HOST_WIDE_INT our_size;
5620 /* If this is not a static allocation, the only case we want to forbid
5621 is an overflowing size. That will be converted into a raise a
5624 return !(TREE_CODE (gnu_size) == INTEGER_CST
5625 && TREE_OVERFLOW (gnu_size));
5627 /* Otherwise, we need to deal with both variable sizes and constant
5628 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5629 since assemblers may not like very large sizes. */
5630 if (!host_integerp (gnu_size, 1))
5633 our_size = tree_low_cst (gnu_size, 1);
5634 return (int) our_size == our_size;
5637 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5638 NAME, ARGS and ERROR_POINT. */
5641 prepend_one_attribute_to (struct attrib ** attr_list,
5642 enum attr_type attr_type,
5645 Node_Id attr_error_point)
5647 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5649 attr->type = attr_type;
5650 attr->name = attr_name;
5651 attr->args = attr_args;
5652 attr->error_point = attr_error_point;
5654 attr->next = *attr_list;
5658 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5661 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5665 /* Attributes are stored as Representation Item pragmas. */
5667 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5668 gnat_temp = Next_Rep_Item (gnat_temp))
5669 if (Nkind (gnat_temp) == N_Pragma)
5671 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5672 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5673 enum attr_type etype;
5675 /* Map the kind of pragma at hand. Skip if this is not one
5676 we know how to handle. */
5678 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5680 case Pragma_Machine_Attribute:
5681 etype = ATTR_MACHINE_ATTRIBUTE;
5684 case Pragma_Linker_Alias:
5685 etype = ATTR_LINK_ALIAS;
5688 case Pragma_Linker_Section:
5689 etype = ATTR_LINK_SECTION;
5692 case Pragma_Linker_Constructor:
5693 etype = ATTR_LINK_CONSTRUCTOR;
5696 case Pragma_Linker_Destructor:
5697 etype = ATTR_LINK_DESTRUCTOR;
5700 case Pragma_Weak_External:
5701 etype = ATTR_WEAK_EXTERNAL;
5704 case Pragma_Thread_Local_Storage:
5705 etype = ATTR_THREAD_LOCAL_STORAGE;
5712 /* See what arguments we have and turn them into GCC trees for
5713 attribute handlers. These expect identifier for strings. We
5714 handle at most two arguments, static expressions only. */
5716 if (Present (gnat_assoc) && Present (First (gnat_assoc)))
5718 Node_Id gnat_arg0 = Next (First (gnat_assoc));
5719 Node_Id gnat_arg1 = Empty;
5721 if (Present (gnat_arg0)
5722 && Is_Static_Expression (Expression (gnat_arg0)))
5724 gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0));
5726 if (TREE_CODE (gnu_arg0) == STRING_CST)
5727 gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0));
5729 gnat_arg1 = Next (gnat_arg0);
5732 if (Present (gnat_arg1)
5733 && Is_Static_Expression (Expression (gnat_arg1)))
5735 gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1));
5737 if (TREE_CODE (gnu_arg1) == STRING_CST)
5738 gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1));
5742 /* Prepend to the list now. Make a list of the argument we might
5743 have, as GCC expects it. */
5744 prepend_one_attribute_to
5747 (gnu_arg1 != NULL_TREE)
5748 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5749 Present (Next (First (gnat_assoc)))
5750 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5754 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5755 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5756 return the GCC tree to use for that expression. GNU_NAME is the suffix
5757 to use if a variable needs to be created and DEFINITION is true if this
5758 is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result;
5759 otherwise, we are just elaborating the expression for side-effects. If
5760 NEED_DEBUG is true, we need a variable for debugging purposes even if it
5761 isn't needed for code generation. */
5764 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name,
5765 bool definition, bool need_value, bool need_debug)
5769 /* If we already elaborated this expression (e.g. it was involved
5770 in the definition of a private type), use the old value. */
5771 if (present_gnu_tree (gnat_expr))
5772 return get_gnu_tree (gnat_expr);
5774 /* If we don't need a value and this is static or a discriminant,
5775 we don't need to do anything. */
5777 && (Is_OK_Static_Expression (gnat_expr)
5778 || (Nkind (gnat_expr) == N_Identifier
5779 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5782 /* If it's a static expression, we don't need a variable for debugging. */
5783 if (need_debug && Is_OK_Static_Expression (gnat_expr))
5786 /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */
5787 gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity,
5788 gnu_name, definition, need_debug);
5790 /* Save the expression in case we try to elaborate this entity again. Since
5791 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5792 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5793 save_gnu_tree (gnat_expr, gnu_expr, true);
5795 return need_value ? gnu_expr : error_mark_node;
5798 /* Similar, but take a GNU expression and always return a result. */
5801 elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
5802 bool definition, bool need_debug)
5804 /* Skip any conversions and simple arithmetics to see if the expression
5805 is a read-only variable.
5806 ??? This really should remain read-only, but we have to think about
5807 the typing of the tree here. */
5809 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5810 tree gnu_decl = NULL_TREE;
5811 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5814 /* In most cases, we won't see a naked FIELD_DECL because a discriminant
5815 reference will have been replaced with a COMPONENT_REF when the type
5816 is being elaborated. However, there are some cases involving child
5817 types where we will. So convert it to a COMPONENT_REF. We hope it
5818 will be at the highest level of the expression in these cases. */
5819 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5820 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5821 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5822 gnu_expr, NULL_TREE);
5824 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5825 that is read-only, make a variable that is initialized to contain the
5826 bound when the package containing the definition is elaborated. If
5827 this entity is defined at top level and a bound or discriminant value
5828 isn't a constant or a reference to a discriminant, replace the bound
5829 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5830 rely here on the fact that an expression cannot contain both the
5831 discriminant and some other variable. */
5832 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5833 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5834 && (TREE_READONLY (gnu_inner_expr)
5835 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5836 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5838 /* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */
5839 if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr))
5842 /* Now create the variable if we need it. */
5843 if (need_debug || (expr_variable && expr_global))
5845 = create_var_decl (create_concat_name (gnat_entity,
5846 IDENTIFIER_POINTER (gnu_name)),
5847 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5848 !need_debug, Is_Public (gnat_entity),
5849 !definition, false, NULL, gnat_entity);
5851 /* We only need to use this variable if we are in global context since GCC
5852 can do the right thing in the local case. */
5853 if (expr_global && expr_variable)
5856 return expr_variable ? gnat_save_expr (gnu_expr) : gnu_expr;
5859 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5860 starting bit position so that it is aligned to ALIGN bits, and leaving at
5861 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5862 record is guaranteed to get. */
5865 make_aligning_type (tree type, unsigned int align, tree size,
5866 unsigned int base_align, int room)
5868 /* We will be crafting a record type with one field at a position set to be
5869 the next multiple of ALIGN past record'address + room bytes. We use a
5870 record placeholder to express record'address. */
5872 tree record_type = make_node (RECORD_TYPE);
5873 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5876 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5878 /* The diagram below summarizes the shape of what we manipulate:
5880 <--------- pos ---------->
5881 { +------------+-------------+-----------------+
5882 record =>{ |############| ... | field (type) |
5883 { +------------+-------------+-----------------+
5884 |<-- room -->|<- voffset ->|<---- size ----->|
5887 record_addr vblock_addr
5889 Every length is in sizetype bytes there, except "pos" which has to be
5890 set as a bit position in the GCC tree for the record. */
5892 tree room_st = size_int (room);
5893 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5894 tree voffset_st, pos, field;
5896 tree name = TYPE_NAME (type);
5898 if (TREE_CODE (name) == TYPE_DECL)
5899 name = DECL_NAME (name);
5901 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5903 /* Compute VOFFSET and then POS. The next byte position multiple of some
5904 alignment after some address is obtained by "and"ing the alignment minus
5905 1 with the two's complement of the address. */
5907 voffset_st = size_binop (BIT_AND_EXPR,
5908 size_diffop (size_zero_node, vblock_addr_st),
5909 ssize_int ((align / BITS_PER_UNIT) - 1));
5911 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5913 pos = size_binop (MULT_EXPR,
5914 convert (bitsizetype,
5915 size_binop (PLUS_EXPR, room_st, voffset_st)),
5918 /* Craft the GCC record representation. We exceptionally do everything
5919 manually here because 1) our generic circuitry is not quite ready to
5920 handle the complex position/size expressions we are setting up, 2) we
5921 have a strong simplifying factor at hand: we know the maximum possible
5922 value of voffset, and 3) we have to set/reset at least the sizes in
5923 accordance with this maximum value anyway, as we need them to convey
5924 what should be "alloc"ated for this type.
5926 Use -1 as the 'addressable' indication for the field to prevent the
5927 creation of a bitfield. We don't need one, it would have damaging
5928 consequences on the alignment computation, and create_field_decl would
5929 make one without this special argument, for instance because of the
5930 complex position expression. */
5932 field = create_field_decl (get_identifier ("F"), type, record_type,
5934 TYPE_FIELDS (record_type) = field;
5936 TYPE_ALIGN (record_type) = base_align;
5937 TYPE_USER_ALIGN (record_type) = 1;
5939 TYPE_SIZE (record_type)
5940 = size_binop (PLUS_EXPR,
5941 size_binop (MULT_EXPR, convert (bitsizetype, size),
5943 bitsize_int (align + room * BITS_PER_UNIT));
5944 TYPE_SIZE_UNIT (record_type)
5945 = size_binop (PLUS_EXPR, size,
5946 size_int (room + align / BITS_PER_UNIT));
5948 SET_TYPE_MODE (record_type, BLKmode);
5950 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5954 /* Return the result of rounding T up to ALIGN. */
5956 static inline unsigned HOST_WIDE_INT
5957 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5965 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5966 as the field type of a packed record if IN_RECORD is true, or as the
5967 component type of a packed array if IN_RECORD is false. See if we can
5968 rewrite it either as a type that has a non-BLKmode, which we can pack
5969 tighter in the packed record case, or as a smaller type. If so, return
5970 the new type. If not, return the original type. */
5973 make_packable_type (tree type, bool in_record)
5975 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5976 unsigned HOST_WIDE_INT new_size;
5977 tree new_type, old_field, field_list = NULL_TREE;
5979 /* No point in doing anything if the size is zero. */
5983 new_type = make_node (TREE_CODE (type));
5985 /* Copy the name and flags from the old type to that of the new.
5986 Note that we rely on the pointer equality created here for
5987 TYPE_NAME to look through conversions in various places. */
5988 TYPE_NAME (new_type) = TYPE_NAME (type);
5989 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5990 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5991 if (TREE_CODE (type) == RECORD_TYPE)
5992 TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type);
5994 /* If we are in a record and have a small size, set the alignment to
5995 try for an integral mode. Otherwise set it to try for a smaller
5996 type with BLKmode. */
5997 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5999 TYPE_ALIGN (new_type) = ceil_alignment (size);
6000 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
6004 unsigned HOST_WIDE_INT align;
6006 /* Do not try to shrink the size if the RM size is not constant. */
6007 if (TYPE_CONTAINS_TEMPLATE_P (type)
6008 || !host_integerp (TYPE_ADA_SIZE (type), 1))
6011 /* Round the RM size up to a unit boundary to get the minimal size
6012 for a BLKmode record. Give up if it's already the size. */
6013 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
6014 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
6015 if (new_size == size)
6018 align = new_size & -new_size;
6019 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
6022 TYPE_USER_ALIGN (new_type) = 1;
6024 /* Now copy the fields, keeping the position and size as we don't want
6025 to change the layout by propagating the packedness downwards. */
6026 for (old_field = TYPE_FIELDS (type); old_field;
6027 old_field = TREE_CHAIN (old_field))
6029 tree new_field_type = TREE_TYPE (old_field);
6030 tree new_field, new_size;
6032 if ((TREE_CODE (new_field_type) == RECORD_TYPE
6033 || TREE_CODE (new_field_type) == UNION_TYPE
6034 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
6035 && !TYPE_FAT_POINTER_P (new_field_type)
6036 && host_integerp (TYPE_SIZE (new_field_type), 1))
6037 new_field_type = make_packable_type (new_field_type, true);
6039 /* However, for the last field in a not already packed record type
6040 that is of an aggregate type, we need to use the RM size in the
6041 packable version of the record type, see finish_record_type. */
6042 if (!TREE_CHAIN (old_field)
6043 && !TYPE_PACKED (type)
6044 && (TREE_CODE (new_field_type) == RECORD_TYPE
6045 || TREE_CODE (new_field_type) == UNION_TYPE
6046 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
6047 && !TYPE_FAT_POINTER_P (new_field_type)
6048 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
6049 && TYPE_ADA_SIZE (new_field_type))
6050 new_size = TYPE_ADA_SIZE (new_field_type);
6052 new_size = DECL_SIZE (old_field);
6054 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
6055 new_type, TYPE_PACKED (type), new_size,
6056 bit_position (old_field),
6057 !DECL_NONADDRESSABLE_P (old_field));
6059 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
6060 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
6061 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
6062 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
6064 TREE_CHAIN (new_field) = field_list;
6065 field_list = new_field;
6068 finish_record_type (new_type, nreverse (field_list), 2, false);
6069 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
6071 /* If this is a padding record, we never want to make the size smaller
6072 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
6073 if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE)
6075 TYPE_SIZE (new_type) = TYPE_SIZE (type);
6076 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
6081 TYPE_SIZE (new_type) = bitsize_int (new_size);
6082 TYPE_SIZE_UNIT (new_type)
6083 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
6086 if (!TYPE_CONTAINS_TEMPLATE_P (type))
6087 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
6089 compute_record_mode (new_type);
6091 /* Try harder to get a packable type if necessary, for example
6092 in case the record itself contains a BLKmode field. */
6093 if (in_record && TYPE_MODE (new_type) == BLKmode)
6094 SET_TYPE_MODE (new_type,
6095 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
6097 /* If neither the mode nor the size has shrunk, return the old type. */
6098 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
6104 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
6105 if needed. We have already verified that SIZE and TYPE are large enough.
6106 GNAT_ENTITY is used to name the resulting record and to issue a warning.
6107 IS_COMPONENT_TYPE is true if this is being done for the component type
6108 of an array. IS_USER_TYPE is true if we must complete the original type.
6109 DEFINITION is true if this type is being defined. SAME_RM_SIZE is true
6110 if the RM size of the resulting type is to be set to SIZE too; otherwise,
6111 it's set to the RM size of the original type. */
6114 maybe_pad_type (tree type, tree size, unsigned int align,
6115 Entity_Id gnat_entity, bool is_component_type,
6116 bool is_user_type, bool definition, bool same_rm_size)
6118 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
6119 tree orig_size = TYPE_SIZE (type);
6122 /* If TYPE is a padded type, see if it agrees with any size and alignment
6123 we were given. If so, return the original type. Otherwise, strip
6124 off the padding, since we will either be returning the inner type
6125 or repadding it. If no size or alignment is specified, use that of
6126 the original padded type. */
6127 if (TYPE_IS_PADDING_P (type))
6130 || operand_equal_p (round_up (size,
6131 MAX (align, TYPE_ALIGN (type))),
6132 round_up (TYPE_SIZE (type),
6133 MAX (align, TYPE_ALIGN (type))),
6135 && (align == 0 || align == TYPE_ALIGN (type)))
6139 size = TYPE_SIZE (type);
6141 align = TYPE_ALIGN (type);
6143 type = TREE_TYPE (TYPE_FIELDS (type));
6144 orig_size = TYPE_SIZE (type);
6147 /* If the size is either not being changed or is being made smaller (which
6148 is not done here and is only valid for bitfields anyway), show the size
6149 isn't changing. Likewise, clear the alignment if it isn't being
6150 changed. Then return if we aren't doing anything. */
6152 && (operand_equal_p (size, orig_size, 0)
6153 || (TREE_CODE (orig_size) == INTEGER_CST
6154 && tree_int_cst_lt (size, orig_size))))
6157 if (align == TYPE_ALIGN (type))
6160 if (align == 0 && !size)
6163 /* If requested, complete the original type and give it a name. */
6165 create_type_decl (get_entity_name (gnat_entity), type,
6166 NULL, !Comes_From_Source (gnat_entity),
6168 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6169 && DECL_IGNORED_P (TYPE_NAME (type))),
6172 /* We used to modify the record in place in some cases, but that could
6173 generate incorrect debugging information. So make a new record
6175 record = make_node (RECORD_TYPE);
6176 TYPE_PADDING_P (record) = 1;
6178 if (Present (gnat_entity))
6179 TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD");
6181 TYPE_VOLATILE (record)
6182 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6184 TYPE_ALIGN (record) = align;
6185 TYPE_SIZE (record) = size ? size : orig_size;
6186 TYPE_SIZE_UNIT (record)
6187 = convert (sizetype,
6188 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6189 bitsize_unit_node));
6191 /* If we are changing the alignment and the input type is a record with
6192 BLKmode and a small constant size, try to make a form that has an
6193 integral mode. This might allow the padding record to also have an
6194 integral mode, which will be much more efficient. There is no point
6195 in doing so if a size is specified unless it is also a small constant
6196 size and it is incorrect to do so if we cannot guarantee that the mode
6197 will be naturally aligned since the field must always be addressable.
6199 ??? This might not always be a win when done for a stand-alone object:
6200 since the nominal and the effective type of the object will now have
6201 different modes, a VIEW_CONVERT_EXPR will be required for converting
6202 between them and it might be hard to overcome afterwards, including
6203 at the RTL level when the stand-alone object is accessed as a whole. */
6205 && TREE_CODE (type) == RECORD_TYPE
6206 && TYPE_MODE (type) == BLKmode
6207 && TREE_CODE (orig_size) == INTEGER_CST
6208 && !TREE_OVERFLOW (orig_size)
6209 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6211 || (TREE_CODE (size) == INTEGER_CST
6212 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6214 tree packable_type = make_packable_type (type, true);
6215 if (TYPE_MODE (packable_type) != BLKmode
6216 && align >= TYPE_ALIGN (packable_type))
6217 type = packable_type;
6220 /* Now create the field with the original size. */
6221 field = create_field_decl (get_identifier ("F"), type, record, 0,
6222 orig_size, bitsize_zero_node, 1);
6223 DECL_INTERNAL_P (field) = 1;
6225 /* Do not emit debug info until after the auxiliary record is built. */
6226 finish_record_type (record, field, 1, false);
6228 /* Set the same size for its RM size if requested; otherwise reuse
6229 the RM size of the original type. */
6230 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6232 /* Unless debugging information isn't being written for the input type,
6233 write a record that shows what we are a subtype of and also make a
6234 variable that indicates our size, if still variable. */
6235 if (TREE_CODE (orig_size) != INTEGER_CST
6236 && TYPE_NAME (record)
6238 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6239 && DECL_IGNORED_P (TYPE_NAME (type))))
6241 tree marker = make_node (RECORD_TYPE);
6242 tree name = TYPE_NAME (record);
6243 tree orig_name = TYPE_NAME (type);
6245 if (TREE_CODE (name) == TYPE_DECL)
6246 name = DECL_NAME (name);
6248 if (TREE_CODE (orig_name) == TYPE_DECL)
6249 orig_name = DECL_NAME (orig_name);
6251 TYPE_NAME (marker) = concat_name (name, "XVS");
6252 finish_record_type (marker,
6253 create_field_decl (orig_name,
6254 build_reference_type (type),
6255 marker, 0, NULL_TREE, NULL_TREE,
6259 add_parallel_type (TYPE_STUB_DECL (record), marker);
6261 if (definition && size && TREE_CODE (size) != INTEGER_CST)
6262 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6263 TYPE_SIZE_UNIT (record), false, false, false,
6264 false, NULL, gnat_entity);
6267 rest_of_record_type_compilation (record);
6269 /* If the size was widened explicitly, maybe give a warning. Take the
6270 original size as the maximum size of the input if there was an
6271 unconstrained record involved and round it up to the specified alignment,
6272 if one was specified. */
6273 if (CONTAINS_PLACEHOLDER_P (orig_size))
6274 orig_size = max_size (orig_size, true);
6277 orig_size = round_up (orig_size, align);
6279 if (Present (gnat_entity)
6281 && TREE_CODE (size) != MAX_EXPR
6282 && !operand_equal_p (size, orig_size, 0)
6283 && !(TREE_CODE (size) == INTEGER_CST
6284 && TREE_CODE (orig_size) == INTEGER_CST
6285 && tree_int_cst_lt (size, orig_size)))
6287 Node_Id gnat_error_node = Empty;
6289 if (Is_Packed_Array_Type (gnat_entity))
6290 gnat_entity = Original_Array_Type (gnat_entity);
6292 if ((Ekind (gnat_entity) == E_Component
6293 || Ekind (gnat_entity) == E_Discriminant)
6294 && Present (Component_Clause (gnat_entity)))
6295 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6296 else if (Present (Size_Clause (gnat_entity)))
6297 gnat_error_node = Expression (Size_Clause (gnat_entity));
6299 /* Generate message only for entities that come from source, since
6300 if we have an entity created by expansion, the message will be
6301 generated for some other corresponding source entity. */
6302 if (Comes_From_Source (gnat_entity))
6304 if (Present (gnat_error_node))
6305 post_error_ne_tree ("{^ }bits of & unused?",
6306 gnat_error_node, gnat_entity,
6307 size_diffop (size, orig_size));
6308 else if (is_component_type)
6309 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6310 gnat_entity, gnat_entity,
6311 size_diffop (size, orig_size));
6318 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6319 the value passed against the list of choices. */
6322 choices_to_gnu (tree operand, Node_Id choices)
6326 tree result = integer_zero_node;
6327 tree this_test, low = 0, high = 0, single = 0;
6329 for (choice = First (choices); Present (choice); choice = Next (choice))
6331 switch (Nkind (choice))
6334 low = gnat_to_gnu (Low_Bound (choice));
6335 high = gnat_to_gnu (High_Bound (choice));
6337 /* There's no good type to use here, so we might as well use
6338 integer_type_node. */
6340 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6341 build_binary_op (GE_EXPR, integer_type_node,
6343 build_binary_op (LE_EXPR, integer_type_node,
6348 case N_Subtype_Indication:
6349 gnat_temp = Range_Expression (Constraint (choice));
6350 low = gnat_to_gnu (Low_Bound (gnat_temp));
6351 high = gnat_to_gnu (High_Bound (gnat_temp));
6354 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6355 build_binary_op (GE_EXPR, integer_type_node,
6357 build_binary_op (LE_EXPR, integer_type_node,
6362 case N_Expanded_Name:
6363 /* This represents either a subtype range, an enumeration
6364 literal, or a constant Ekind says which. If an enumeration
6365 literal or constant, fall through to the next case. */
6366 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6367 && Ekind (Entity (choice)) != E_Constant)
6369 tree type = gnat_to_gnu_type (Entity (choice));
6371 low = TYPE_MIN_VALUE (type);
6372 high = TYPE_MAX_VALUE (type);
6375 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6376 build_binary_op (GE_EXPR, integer_type_node,
6378 build_binary_op (LE_EXPR, integer_type_node,
6383 /* ... fall through ... */
6385 case N_Character_Literal:
6386 case N_Integer_Literal:
6387 single = gnat_to_gnu (choice);
6388 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6392 case N_Others_Choice:
6393 this_test = integer_one_node;
6400 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6407 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6408 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6411 adjust_packed (tree field_type, tree record_type, int packed)
6413 /* If the field contains an item of variable size, we cannot pack it
6414 because we cannot create temporaries of non-fixed size in case
6415 we need to take the address of the field. See addressable_p and
6416 the notes on the addressability issues for further details. */
6417 if (is_variable_size (field_type))
6420 /* If the alignment of the record is specified and the field type
6421 is over-aligned, request Storage_Unit alignment for the field. */
6424 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6433 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6434 placed in GNU_RECORD_TYPE.
6436 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6437 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6438 record has a specified alignment.
6440 DEFINITION is true if this field is for a record being defined.
6442 DEBUG_INFO_P is true if we need to write debug information for types
6443 that we may create in the process. */
6446 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6447 bool definition, bool debug_info_p)
6449 tree gnu_field_id = get_entity_name (gnat_field);
6450 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6451 tree gnu_field, gnu_size, gnu_pos;
6452 bool needs_strict_alignment
6453 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6454 || Treat_As_Volatile (gnat_field));
6456 /* If this field requires strict alignment, we cannot pack it because
6457 it would very likely be under-aligned in the record. */
6458 if (needs_strict_alignment)
6461 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6463 /* If a size is specified, use it. Otherwise, if the record type is packed,
6464 use the official RM size. See "Handling of Type'Size Values" in Einfo
6465 for further details. */
6466 if (Known_Static_Esize (gnat_field))
6467 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6468 gnat_field, FIELD_DECL, false, true);
6469 else if (packed == 1)
6470 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6471 gnat_field, FIELD_DECL, false, true);
6473 gnu_size = NULL_TREE;
6475 /* If we have a specified size that is smaller than that of the field's type,
6476 or a position is specified, and the field's type is a record that doesn't
6477 require strict alignment, see if we can get either an integral mode form
6478 of the type or a smaller form. If we can, show a size was specified for
6479 the field if there wasn't one already, so we know to make this a bitfield
6480 and avoid making things wider.
6482 Changing to an integral mode form is useful when the record is packed as
6483 we can then place the field at a non-byte-aligned position and so achieve
6484 tighter packing. This is in addition required if the field shares a byte
6485 with another field and the front-end lets the back-end handle the access
6486 to the field, because GCC cannot handle non-byte-aligned BLKmode fields.
6488 Changing to a smaller form is required if the specified size is smaller
6489 than that of the field's type and the type contains sub-fields that are
6490 padded, in order to avoid generating accesses to these sub-fields that
6491 are wider than the field.
6493 We avoid the transformation if it is not required or potentially useful,
6494 as it might entail an increase of the field's alignment and have ripple
6495 effects on the outer record type. A typical case is a field known to be
6496 byte-aligned and not to share a byte with another field. */
6497 if (!needs_strict_alignment
6498 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6499 && !TYPE_FAT_POINTER_P (gnu_field_type)
6500 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6503 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6504 || (Present (Component_Clause (gnat_field))
6505 && !(UI_To_Int (Component_Bit_Offset (gnat_field))
6506 % BITS_PER_UNIT == 0
6507 && value_factor_p (gnu_size, BITS_PER_UNIT)))))))
6509 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6510 if (gnu_packable_type != gnu_field_type)
6512 gnu_field_type = gnu_packable_type;
6514 gnu_size = rm_size (gnu_field_type);
6518 /* If we are packing the record and the field is BLKmode, round the
6519 size up to a byte boundary. */
6520 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6521 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6523 if (Present (Component_Clause (gnat_field)))
6525 Entity_Id gnat_parent
6526 = Parent_Subtype (Underlying_Type (Scope (gnat_field)));
6528 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6529 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6530 gnat_field, FIELD_DECL, false, true);
6532 /* Ensure the position does not overlap with the parent subtype, if there
6533 is one. This test is omitted if the parent of the tagged type has a
6534 full rep clause since, in this case, component clauses are allowed to
6535 overlay the space allocated for the parent type and the front-end has
6536 checked that there are no overlapping components. */
6537 if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent))
6539 tree gnu_parent = gnat_to_gnu_type (gnat_parent);
6541 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6542 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6545 ("offset of& must be beyond parent{, minimum allowed is ^}",
6546 First_Bit (Component_Clause (gnat_field)), gnat_field,
6547 TYPE_SIZE_UNIT (gnu_parent));
6551 /* If this field needs strict alignment, ensure the record is
6552 sufficiently aligned and that that position and size are
6553 consistent with the alignment. */
6554 if (needs_strict_alignment)
6556 TYPE_ALIGN (gnu_record_type)
6557 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6560 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6562 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6564 ("atomic field& must be natural size of type{ (^)}",
6565 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6566 TYPE_SIZE (gnu_field_type));
6568 else if (Is_Aliased (gnat_field))
6570 ("size of aliased field& must be ^ bits",
6571 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6572 TYPE_SIZE (gnu_field_type));
6574 else if (Strict_Alignment (Etype (gnat_field)))
6576 ("size of & with aliased or tagged components not ^ bits",
6577 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6578 TYPE_SIZE (gnu_field_type));
6580 gnu_size = NULL_TREE;
6583 if (!integer_zerop (size_binop
6584 (TRUNC_MOD_EXPR, gnu_pos,
6585 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6587 if (Is_Aliased (gnat_field))
6589 ("position of aliased field& must be multiple of ^ bits",
6590 First_Bit (Component_Clause (gnat_field)), gnat_field,
6591 TYPE_ALIGN (gnu_field_type));
6593 else if (Treat_As_Volatile (gnat_field))
6595 ("position of volatile field& must be multiple of ^ bits",
6596 First_Bit (Component_Clause (gnat_field)), gnat_field,
6597 TYPE_ALIGN (gnu_field_type));
6599 else if (Strict_Alignment (Etype (gnat_field)))
6601 ("position of & with aliased or tagged components not multiple of ^ bits",
6602 First_Bit (Component_Clause (gnat_field)), gnat_field,
6603 TYPE_ALIGN (gnu_field_type));
6608 gnu_pos = NULL_TREE;
6612 if (Is_Atomic (gnat_field))
6613 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6616 /* If the record has rep clauses and this is the tag field, make a rep
6617 clause for it as well. */
6618 else if (Has_Specified_Layout (Scope (gnat_field))
6619 && Chars (gnat_field) == Name_uTag)
6621 gnu_pos = bitsize_zero_node;
6622 gnu_size = TYPE_SIZE (gnu_field_type);
6626 gnu_pos = NULL_TREE;
6628 /* We need to make the size the maximum for the type if it is
6629 self-referential and an unconstrained type. In that case, we can't
6630 pack the field since we can't make a copy to align it. */
6631 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6633 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6634 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6636 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6640 /* If a size is specified, adjust the field's type to it. */
6643 tree orig_field_type;
6645 /* If the field's type is justified modular, we would need to remove
6646 the wrapper to (better) meet the layout requirements. However we
6647 can do so only if the field is not aliased to preserve the unique
6648 layout and if the prescribed size is not greater than that of the
6649 packed array to preserve the justification. */
6650 if (!needs_strict_alignment
6651 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6652 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6653 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6655 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6658 = make_type_from_size (gnu_field_type, gnu_size,
6659 Has_Biased_Representation (gnat_field));
6661 orig_field_type = gnu_field_type;
6662 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6663 false, false, definition, true);
6665 /* If a padding record was made, declare it now since it will never be
6666 declared otherwise. This is necessary to ensure that its subtrees
6667 are properly marked. */
6668 if (gnu_field_type != orig_field_type
6669 && !DECL_P (TYPE_NAME (gnu_field_type)))
6670 create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, NULL,
6671 true, debug_info_p, gnat_field);
6674 /* Otherwise (or if there was an error), don't specify a position. */
6676 gnu_pos = NULL_TREE;
6678 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6679 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6681 /* Now create the decl for the field. */
6682 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6683 packed, gnu_size, gnu_pos,
6684 Is_Aliased (gnat_field));
6685 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6686 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6688 if (Ekind (gnat_field) == E_Discriminant)
6689 DECL_DISCRIMINANT_NUMBER (gnu_field)
6690 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6695 /* Return true if TYPE is a type with variable size, a padding type with a
6696 field of variable size or is a record that has a field such a field. */
6699 is_variable_size (tree type)
6703 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6706 if (TYPE_IS_PADDING_P (type)
6707 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6710 if (TREE_CODE (type) != RECORD_TYPE
6711 && TREE_CODE (type) != UNION_TYPE
6712 && TREE_CODE (type) != QUAL_UNION_TYPE)
6715 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6716 if (is_variable_size (TREE_TYPE (field)))
6722 /* qsort comparer for the bit positions of two record components. */
6725 compare_field_bitpos (const PTR rt1, const PTR rt2)
6727 const_tree const field1 = * (const_tree const *) rt1;
6728 const_tree const field2 = * (const_tree const *) rt2;
6730 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6732 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6735 /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set
6736 the result as the field list of GNU_RECORD_TYPE and finish it up. When
6737 called from gnat_to_gnu_entity during the processing of a record type
6738 definition, the GCC node for the parent, if any, will be the single field
6739 of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the
6740 GNU_FIELD_LIST. The other calls to this function are recursive calls for
6741 the component list of a variant and, in this case, GNU_FIELD_LIST is empty.
6743 PACKED is 1 if this is for a packed record, -1 if this is for a record
6744 with Component_Alignment of Storage_Unit, -2 if this is for a record
6745 with a specified alignment.
6747 DEFINITION is true if we are defining this record type.
6749 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6750 with a rep clause is to be added; in this case, that is all that should
6751 be done with such fields.
6753 CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying
6754 out the record. This means the alignment only serves to force fields to
6755 be bitfields, but not to require the record to be that aligned. This is
6758 ALL_REP is true if a rep clause is present for all the fields.
6760 UNCHECKED_UNION is true if we are building this type for a record with a
6761 Pragma Unchecked_Union.
6763 DEBUG_INFO_P is true if we need to write debug information about the type.
6765 MAYBE_UNUSED is true if this type may be unused in the end; this doesn't
6766 mean that its contents may be unused as well, but only the container. */
6770 components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
6771 tree gnu_field_list, int packed, bool definition,
6772 tree *p_gnu_rep_list, bool cancel_alignment,
6773 bool all_rep, bool unchecked_union, bool debug_info_p,
6776 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6777 bool layout_with_rep = false;
6778 Node_Id component_decl, variant_part;
6779 tree gnu_our_rep_list = NULL_TREE;
6780 tree gnu_field, gnu_next, gnu_last = tree_last (gnu_field_list);
6782 /* For each component referenced in a component declaration create a GCC
6783 field and add it to the list, skipping pragmas in the GNAT list. */
6784 if (Present (Component_Items (gnat_component_list)))
6786 = First_Non_Pragma (Component_Items (gnat_component_list));
6787 Present (component_decl);
6788 component_decl = Next_Non_Pragma (component_decl))
6790 Entity_Id gnat_field = Defining_Entity (component_decl);
6791 Name_Id gnat_name = Chars (gnat_field);
6793 /* If present, the _Parent field must have been created as the single
6794 field of the record type. Put it before any other fields. */
6795 if (gnat_name == Name_uParent)
6797 gnu_field = TYPE_FIELDS (gnu_record_type);
6798 gnu_field_list = chainon (gnu_field_list, gnu_field);
6802 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
6803 definition, debug_info_p);
6805 /* If this is the _Tag field, put it before any other fields. */
6806 if (gnat_name == Name_uTag)
6807 gnu_field_list = chainon (gnu_field_list, gnu_field);
6809 /* If this is the _Controller field, put it before the other
6810 fields except for the _Tag or _Parent field. */
6811 else if (gnat_name == Name_uController && gnu_last)
6813 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
6814 TREE_CHAIN (gnu_last) = gnu_field;
6817 /* If this is a regular field, put it after the other fields. */
6820 TREE_CHAIN (gnu_field) = gnu_field_list;
6821 gnu_field_list = gnu_field;
6823 gnu_last = gnu_field;
6827 save_gnu_tree (gnat_field, gnu_field, false);
6830 /* At the end of the component list there may be a variant part. */
6831 variant_part = Variant_Part (gnat_component_list);
6833 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6834 mutually exclusive and should go in the same memory. To do this we need
6835 to treat each variant as a record whose elements are created from the
6836 component list for the variant. So here we create the records from the
6837 lists for the variants and put them all into the QUAL_UNION_TYPE.
6838 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6839 use GNU_RECORD_TYPE if there are no fields so far. */
6840 if (Present (variant_part))
6842 Node_Id gnat_discr = Name (variant_part), variant;
6843 tree gnu_discr = gnat_to_gnu (gnat_discr);
6844 tree gnu_name = TYPE_NAME (gnu_record_type);
6846 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6848 tree gnu_union_type, gnu_union_name, gnu_union_field;
6849 tree gnu_variant_list = NULL_TREE;
6851 if (TREE_CODE (gnu_name) == TYPE_DECL)
6852 gnu_name = DECL_NAME (gnu_name);
6855 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6857 /* Reuse an enclosing union if all fields are in the variant part
6858 and there is no representation clause on the record, to match
6859 the layout of C unions. There is an associated check below. */
6861 && TREE_CODE (gnu_record_type) == UNION_TYPE
6862 && !TYPE_PACKED (gnu_record_type))
6863 gnu_union_type = gnu_record_type;
6867 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6869 TYPE_NAME (gnu_union_type) = gnu_union_name;
6870 TYPE_ALIGN (gnu_union_type) = 0;
6871 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6874 for (variant = First_Non_Pragma (Variants (variant_part));
6876 variant = Next_Non_Pragma (variant))
6878 tree gnu_variant_type = make_node (RECORD_TYPE);
6879 tree gnu_inner_name;
6882 Get_Variant_Encoding (variant);
6883 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6884 TYPE_NAME (gnu_variant_type)
6885 = concat_name (gnu_union_name,
6886 IDENTIFIER_POINTER (gnu_inner_name));
6888 /* Set the alignment of the inner type in case we need to make
6889 inner objects into bitfields, but then clear it out so the
6890 record actually gets only the alignment required. */
6891 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6892 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6894 /* Similarly, if the outer record has a size specified and all
6895 fields have record rep clauses, we can propagate the size
6896 into the variant part. */
6897 if (all_rep_and_size)
6899 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6900 TYPE_SIZE_UNIT (gnu_variant_type)
6901 = TYPE_SIZE_UNIT (gnu_record_type);
6904 /* Add the fields into the record type for the variant. Note that
6905 we aren't sure to really use it at this point, see below. */
6906 components_to_record (gnu_variant_type, Component_List (variant),
6907 NULL_TREE, packed, definition,
6908 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6909 unchecked_union, debug_info_p, true);
6911 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6913 Set_Present_Expr (variant, annotate_value (gnu_qual));
6915 /* If this is an Unchecked_Union and we have exactly one field,
6916 use this field directly to match the layout of C unions. */
6918 && TYPE_FIELDS (gnu_variant_type)
6919 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6920 gnu_field = TYPE_FIELDS (gnu_variant_type);
6923 /* Deal with packedness like in gnat_to_gnu_field. */
6925 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6927 /* Finalize the record type now. We used to throw away
6928 empty records but we no longer do that because we need
6929 them to generate complete debug info for the variant;
6930 otherwise, the union type definition will be lacking
6931 the fields associated with these empty variants. */
6932 rest_of_record_type_compilation (gnu_variant_type);
6933 create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type,
6934 NULL, true, debug_info_p, gnat_component_list);
6936 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6937 gnu_union_type, field_packed,
6939 ? TYPE_SIZE (gnu_variant_type)
6942 ? bitsize_zero_node : 0),
6945 DECL_INTERNAL_P (gnu_field) = 1;
6947 if (!unchecked_union)
6948 DECL_QUALIFIER (gnu_field) = gnu_qual;
6951 TREE_CHAIN (gnu_field) = gnu_variant_list;
6952 gnu_variant_list = gnu_field;
6955 /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */
6956 if (gnu_variant_list)
6958 int union_field_packed;
6960 if (all_rep_and_size)
6962 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6963 TYPE_SIZE_UNIT (gnu_union_type)
6964 = TYPE_SIZE_UNIT (gnu_record_type);
6967 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6968 all_rep_and_size ? 1 : 0, debug_info_p);
6970 /* If GNU_UNION_TYPE is our record type, it means we must have an
6971 Unchecked_Union with no fields. Verify that and, if so, just
6973 if (gnu_union_type == gnu_record_type)
6975 gcc_assert (unchecked_union
6977 && !gnu_our_rep_list);
6981 create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type,
6982 NULL, true, debug_info_p, gnat_component_list);
6984 /* Deal with packedness like in gnat_to_gnu_field. */
6986 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6989 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6991 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6992 all_rep ? bitsize_zero_node : 0, 0);
6994 DECL_INTERNAL_P (gnu_union_field) = 1;
6995 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6996 gnu_field_list = gnu_union_field;
7000 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
7001 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do
7002 this in a separate pass since we want to handle the discriminants but
7003 can't play with them until we've used them in debugging data above.
7005 ??? If we then reorder them, debugging information will be wrong but
7006 there's nothing that can be done about this at the moment. */
7007 gnu_last = NULL_TREE;
7008 for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next)
7010 gnu_next = TREE_CHAIN (gnu_field);
7012 if (DECL_FIELD_OFFSET (gnu_field))
7015 gnu_field_list = gnu_next;
7017 TREE_CHAIN (gnu_last) = gnu_next;
7019 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
7020 gnu_our_rep_list = gnu_field;
7023 gnu_last = gnu_field;
7026 /* If we have any fields in our rep'ed field list and it is not the case that
7027 all the fields in the record have rep clauses and P_REP_LIST is nonzero,
7028 set it and ignore these fields. */
7029 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
7030 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
7032 /* Otherwise, sort the fields by bit position and put them into their own
7033 record, before the others, if we also have fields without rep clauses. */
7034 else if (gnu_our_rep_list)
7037 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
7038 int i, len = list_length (gnu_our_rep_list);
7039 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
7041 for (gnu_field = gnu_our_rep_list, i = 0;
7043 gnu_field = TREE_CHAIN (gnu_field), i++)
7044 gnu_arr[i] = gnu_field;
7046 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
7048 /* Put the fields in the list in order of increasing position, which
7049 means we start from the end. */
7050 gnu_our_rep_list = NULL_TREE;
7051 for (i = len - 1; i >= 0; i--)
7053 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
7054 gnu_our_rep_list = gnu_arr[i];
7055 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
7060 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, debug_info_p);
7062 = create_field_decl (get_identifier ("REP"), gnu_rep_type,
7063 gnu_record_type, 0, NULL_TREE, NULL_TREE, 1);
7064 DECL_INTERNAL_P (gnu_field) = 1;
7065 gnu_field_list = chainon (gnu_field_list, gnu_field);
7069 layout_with_rep = true;
7070 gnu_field_list = nreverse (gnu_our_rep_list);
7074 if (cancel_alignment)
7075 TYPE_ALIGN (gnu_record_type) = 0;
7077 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
7078 layout_with_rep ? 1 : 0, debug_info_p && !maybe_unused);
7081 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
7082 placed into an Esize, Component_Bit_Offset, or Component_Size value
7083 in the GNAT tree. */
7086 annotate_value (tree gnu_size)
7088 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
7090 Node_Ref_Or_Val ops[3], ret;
7093 struct tree_int_map **h = NULL;
7095 /* See if we've already saved the value for this node. */
7096 if (EXPR_P (gnu_size))
7098 struct tree_int_map in;
7099 if (!annotate_value_cache)
7100 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
7101 tree_int_map_eq, 0);
7102 in.base.from = gnu_size;
7103 h = (struct tree_int_map **)
7104 htab_find_slot (annotate_value_cache, &in, INSERT);
7107 return (Node_Ref_Or_Val) (*h)->to;
7110 /* If we do not return inside this switch, TCODE will be set to the
7111 code to use for a Create_Node operand and LEN (set above) will be
7112 the number of recursive calls for us to make. */
7114 switch (TREE_CODE (gnu_size))
7117 if (TREE_OVERFLOW (gnu_size))
7120 /* This may have come from a conversion from some smaller type,
7121 so ensure this is in bitsizetype. */
7122 gnu_size = convert (bitsizetype, gnu_size);
7124 /* For negative values, use NEGATE_EXPR of the supplied value. */
7125 if (tree_int_cst_sgn (gnu_size) < 0)
7127 /* The ridiculous code below is to handle the case of the largest
7128 negative integer. */
7129 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
7130 bool adjust = false;
7133 if (TREE_OVERFLOW (negative_size))
7136 = size_binop (MINUS_EXPR, bitsize_zero_node,
7137 size_binop (PLUS_EXPR, gnu_size,
7142 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
7144 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
7146 return annotate_value (temp);
7149 if (!host_integerp (gnu_size, 1))
7152 size = tree_low_cst (gnu_size, 1);
7154 /* This peculiar test is to make sure that the size fits in an int
7155 on machines where HOST_WIDE_INT is not "int". */
7156 if (tree_low_cst (gnu_size, 1) == size)
7157 return UI_From_Int (size);
7162 /* The only case we handle here is a simple discriminant reference. */
7163 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
7164 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
7165 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7166 return Create_Node (Discrim_Val,
7167 annotate_value (DECL_DISCRIMINANT_NUMBER
7168 (TREE_OPERAND (gnu_size, 1))),
7173 CASE_CONVERT: case NON_LVALUE_EXPR:
7174 return annotate_value (TREE_OPERAND (gnu_size, 0));
7176 /* Now just list the operations we handle. */
7177 case COND_EXPR: tcode = Cond_Expr; break;
7178 case PLUS_EXPR: tcode = Plus_Expr; break;
7179 case MINUS_EXPR: tcode = Minus_Expr; break;
7180 case MULT_EXPR: tcode = Mult_Expr; break;
7181 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7182 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7183 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7184 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7185 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7186 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7187 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7188 case NEGATE_EXPR: tcode = Negate_Expr; break;
7189 case MIN_EXPR: tcode = Min_Expr; break;
7190 case MAX_EXPR: tcode = Max_Expr; break;
7191 case ABS_EXPR: tcode = Abs_Expr; break;
7192 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7193 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7194 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7195 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7196 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7197 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7198 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7199 case LT_EXPR: tcode = Lt_Expr; break;
7200 case LE_EXPR: tcode = Le_Expr; break;
7201 case GT_EXPR: tcode = Gt_Expr; break;
7202 case GE_EXPR: tcode = Ge_Expr; break;
7203 case EQ_EXPR: tcode = Eq_Expr; break;
7204 case NE_EXPR: tcode = Ne_Expr; break;
7208 tree t = maybe_inline_call_in_expr (gnu_size);
7210 return annotate_value (t);
7213 /* Fall through... */
7219 /* Now get each of the operands that's relevant for this code. If any
7220 cannot be expressed as a repinfo node, say we can't. */
7221 for (i = 0; i < 3; i++)
7224 for (i = 0; i < len; i++)
7226 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7227 if (ops[i] == No_Uint)
7231 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7233 /* Save the result in the cache. */
7236 *h = GGC_NEW (struct tree_int_map);
7237 (*h)->base.from = gnu_size;
7244 /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception)
7245 and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the
7246 size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null.
7247 BY_REF is true if the object is used by reference. */
7250 annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref)
7254 if (TYPE_IS_FAT_POINTER_P (gnu_type))
7255 gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type);
7257 gnu_type = TREE_TYPE (gnu_type);
7260 if (Unknown_Esize (gnat_entity))
7262 if (TREE_CODE (gnu_type) == RECORD_TYPE
7263 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7264 size = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
7266 size = TYPE_SIZE (gnu_type);
7269 Set_Esize (gnat_entity, annotate_value (size));
7272 if (Unknown_Alignment (gnat_entity))
7273 Set_Alignment (gnat_entity,
7274 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
7277 /* Return first element of field list whose TREE_PURPOSE is the same as ELEM.
7278 Return NULL_TREE if there is no such element in the list. */
7281 purpose_member_field (const_tree elem, tree list)
7285 tree field = TREE_PURPOSE (list);
7286 if (SAME_FIELD_P (field, elem))
7288 list = TREE_CHAIN (list);
7293 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type,
7294 set Component_Bit_Offset and Esize of the components to the position and
7295 size used by Gigi. */
7298 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7300 Entity_Id gnat_field;
7303 /* We operate by first making a list of all fields and their position (we
7304 can get the size easily) and then update all the sizes in the tree. */
7306 = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node,
7307 BIGGEST_ALIGNMENT, NULL_TREE);
7309 for (gnat_field = First_Entity (gnat_entity);
7310 Present (gnat_field);
7311 gnat_field = Next_Entity (gnat_field))
7312 if (Ekind (gnat_field) == E_Component
7313 || (Ekind (gnat_field) == E_Discriminant
7314 && !Is_Unchecked_Union (Scope (gnat_field))))
7316 tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field),
7322 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7324 /* In this mode the tag and parent components are not
7325 generated, so we add the appropriate offset to each
7326 component. For a component appearing in the current
7327 extension, the offset is the size of the parent. */
7328 if (Is_Derived_Type (gnat_entity)
7329 && Original_Record_Component (gnat_field) == gnat_field)
7331 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7334 parent_offset = bitsize_int (POINTER_SIZE);
7337 parent_offset = bitsize_zero_node;
7339 Set_Component_Bit_Offset
7342 (size_binop (PLUS_EXPR,
7343 bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0),
7344 TREE_VEC_ELT (TREE_VALUE (t), 2)),
7347 Set_Esize (gnat_field,
7348 annotate_value (DECL_SIZE (TREE_PURPOSE (t))));
7350 else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity))
7352 /* If there is no entry, this is an inherited component whose
7353 position is the same as in the parent type. */
7354 Set_Component_Bit_Offset
7356 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7358 Set_Esize (gnat_field,
7359 Esize (Original_Record_Component (gnat_field)));
7364 /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is
7365 the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the
7366 value to be placed into DECL_OFFSET_ALIGN and the bit position. The list
7367 of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT
7368 is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the
7369 bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a
7370 pre-existing list to be chained to the newly created entries. */
7373 build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos,
7374 tree gnu_bitpos, unsigned int offset_align, tree gnu_list)
7378 for (gnu_field = TYPE_FIELDS (gnu_type);
7380 gnu_field = TREE_CHAIN (gnu_field))
7382 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7383 DECL_FIELD_BIT_OFFSET (gnu_field));
7384 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7385 DECL_FIELD_OFFSET (gnu_field));
7386 unsigned int our_offset_align
7387 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7388 tree v = make_tree_vec (3);
7390 TREE_VEC_ELT (v, 0) = gnu_our_offset;
7391 TREE_VEC_ELT (v, 1) = size_int (our_offset_align);
7392 TREE_VEC_ELT (v, 2) = gnu_our_bitpos;
7393 gnu_list = tree_cons (gnu_field, v, gnu_list);
7395 /* Recurse on internal fields, flattening the nested fields except for
7396 those in the variant part, if requested. */
7397 if (DECL_INTERNAL_P (gnu_field))
7399 tree gnu_field_type = TREE_TYPE (gnu_field);
7400 if (do_not_flatten_variant
7401 && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE)
7403 = build_position_list (gnu_field_type, do_not_flatten_variant,
7404 size_zero_node, bitsize_zero_node,
7405 BIGGEST_ALIGNMENT, gnu_list);
7408 = build_position_list (gnu_field_type, do_not_flatten_variant,
7409 gnu_our_offset, gnu_our_bitpos,
7410 our_offset_align, gnu_list);
7417 /* Return a TREE_LIST describing the substitutions needed to reflect the
7418 discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can
7419 be in any order. TREE_PURPOSE gives the tree for the discriminant and
7420 TREE_VALUE is the replacement value. They are in the form of operands
7421 to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for a definition
7425 build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition)
7427 tree gnu_list = NULL_TREE;
7428 Entity_Id gnat_discrim;
7431 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
7432 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
7433 Present (gnat_discrim);
7434 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
7435 gnat_value = Next_Elmt (gnat_value))
7436 /* Ignore access discriminants. */
7437 if (!Is_Access_Type (Etype (Node (gnat_value))))
7439 tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim);
7440 gnu_list = tree_cons (gnu_field,
7441 convert (TREE_TYPE (gnu_field),
7442 elaborate_expression
7443 (Node (gnat_value), gnat_subtype,
7444 get_entity_name (gnat_discrim),
7445 definition, true, false)),
7452 /* Scan all fields in QUAL_UNION_TYPE and return a TREE_LIST describing the
7453 variants of QUAL_UNION_TYPE that are still relevant after applying the
7454 substitutions described in SUBST_LIST. TREE_PURPOSE is the type of the
7455 variant and TREE_VALUE is a TREE_VEC containing the field, the new value
7456 of the qualifier and NULL_TREE respectively. GNU_LIST is a pre-existing
7457 list to be chained to the newly created entries. */
7460 build_variant_list (tree qual_union_type, tree subst_list, tree gnu_list)
7464 for (gnu_field = TYPE_FIELDS (qual_union_type);
7466 gnu_field = TREE_CHAIN (gnu_field))
7468 tree t, qual = DECL_QUALIFIER (gnu_field);
7470 for (t = subst_list; t; t = TREE_CHAIN (t))
7471 qual = SUBSTITUTE_IN_EXPR (qual, TREE_PURPOSE (t), TREE_VALUE (t));
7473 /* If the new qualifier is not unconditionally false, its variant may
7474 still be accessed. */
7475 if (!integer_zerop (qual))
7477 tree variant_type = TREE_TYPE (gnu_field), variant_subpart;
7478 tree v = make_tree_vec (3);
7479 TREE_VEC_ELT (v, 0) = gnu_field;
7480 TREE_VEC_ELT (v, 1) = qual;
7481 TREE_VEC_ELT (v, 2) = NULL_TREE;
7482 gnu_list = tree_cons (variant_type, v, gnu_list);
7484 /* Recurse on the variant subpart of the variant, if any. */
7485 variant_subpart = get_variant_part (variant_type);
7486 if (variant_subpart)
7487 gnu_list = build_variant_list (TREE_TYPE (variant_subpart),
7488 subst_list, gnu_list);
7490 /* If the new qualifier is unconditionally true, the subsequent
7491 variants cannot be accessed. */
7492 if (integer_onep (qual))
7500 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7501 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7502 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7503 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7504 for the size of a field. COMPONENT_P is true if we are being called
7505 to process the Component_Size of GNAT_OBJECT. This is used for error
7506 message handling and to indicate to use the object size of GNU_TYPE.
7507 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7508 it means that a size of zero should be treated as an unspecified size. */
7511 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7512 enum tree_code kind, bool component_p, bool zero_ok)
7514 Node_Id gnat_error_node;
7515 tree type_size, size;
7517 if (kind == VAR_DECL
7518 /* If a type needs strict alignment, a component of this type in
7519 a packed record cannot be packed and thus uses the type size. */
7520 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7521 type_size = TYPE_SIZE (gnu_type);
7523 type_size = rm_size (gnu_type);
7525 /* Find the node to use for errors. */
7526 if ((Ekind (gnat_object) == E_Component
7527 || Ekind (gnat_object) == E_Discriminant)
7528 && Present (Component_Clause (gnat_object)))
7529 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7530 else if (Present (Size_Clause (gnat_object)))
7531 gnat_error_node = Expression (Size_Clause (gnat_object));
7533 gnat_error_node = gnat_object;
7535 /* Return 0 if no size was specified, either because Esize was not Present
7536 or the specified size was zero. */
7537 if (No (uint_size) || uint_size == No_Uint)
7540 /* Get the size as a tree. Issue an error if a size was specified but
7541 cannot be represented in sizetype. */
7542 size = UI_To_gnu (uint_size, bitsizetype);
7543 if (TREE_OVERFLOW (size))
7545 post_error_ne (component_p ? "component size of & is too large"
7546 : "size of & is too large",
7547 gnat_error_node, gnat_object);
7551 /* Ignore a negative size since that corresponds to our back-annotation.
7552 Also ignore a zero size if it is not permitted. */
7553 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7556 /* The size of objects is always a multiple of a byte. */
7557 if (kind == VAR_DECL
7558 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7561 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7562 gnat_error_node, gnat_object);
7564 post_error_ne ("size for& is not a multiple of Storage_Unit",
7565 gnat_error_node, gnat_object);
7569 /* If this is an integral type or a packed array type, the front-end has
7570 verified the size, so we need not do it here (which would entail
7571 checking against the bounds). However, if this is an aliased object,
7572 it may not be smaller than the type of the object. */
7573 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7574 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7577 /* If the object is a record that contains a template, add the size of
7578 the template to the specified size. */
7579 if (TREE_CODE (gnu_type) == RECORD_TYPE
7580 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7581 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7583 /* Modify the size of the type to be that of the maximum size if it has a
7585 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7586 type_size = max_size (type_size, true);
7588 /* If this is an access type or a fat pointer, the minimum size is that given
7589 by the smallest integral mode that's valid for pointers. */
7590 if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type))
7592 enum machine_mode p_mode;
7594 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7595 !targetm.valid_pointer_mode (p_mode);
7596 p_mode = GET_MODE_WIDER_MODE (p_mode))
7599 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7602 /* If the size of the object is a constant, the new size must not be
7604 if (TREE_CODE (type_size) != INTEGER_CST
7605 || TREE_OVERFLOW (type_size)
7606 || tree_int_cst_lt (size, type_size))
7610 ("component size for& too small{, minimum allowed is ^}",
7611 gnat_error_node, gnat_object, type_size);
7613 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7614 gnat_error_node, gnat_object, type_size);
7616 if (kind == VAR_DECL && !component_p
7617 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7618 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7619 post_error_ne_tree_2
7620 ("\\size of ^ is not a multiple of alignment (^ bits)",
7621 gnat_error_node, gnat_object, rm_size (gnu_type),
7622 TYPE_ALIGN (gnu_type));
7624 else if (INTEGRAL_TYPE_P (gnu_type))
7625 post_error_ne ("\\size would be legal if & were not aliased!",
7626 gnat_error_node, gnat_object);
7634 /* Similarly, but both validate and process a value of RM size. This
7635 routine is only called for types. */
7638 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7640 /* Only issue an error if a Value_Size clause was explicitly given.
7641 Otherwise, we'd be duplicating an error on the Size clause. */
7642 Node_Id gnat_attr_node
7643 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7644 tree old_size = rm_size (gnu_type), size;
7646 /* Do nothing if no size was specified, either because RM size was not
7647 Present or if the specified size was zero. */
7648 if (No (uint_size) || uint_size == No_Uint)
7651 /* Get the size as a tree. Issue an error if a size was specified but
7652 cannot be represented in sizetype. */
7653 size = UI_To_gnu (uint_size, bitsizetype);
7654 if (TREE_OVERFLOW (size))
7656 if (Present (gnat_attr_node))
7657 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7662 /* Ignore a negative size since that corresponds to our back-annotation.
7663 Also ignore a zero size unless a Value_Size clause exists, or a size
7664 clause exists, or this is an integer type, in which case the front-end
7665 will have always set it. */
7666 if (tree_int_cst_sgn (size) < 0
7667 || (integer_zerop (size)
7668 && No (gnat_attr_node)
7669 && !Has_Size_Clause (gnat_entity)
7670 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7673 /* If the old size is self-referential, get the maximum size. */
7674 if (CONTAINS_PLACEHOLDER_P (old_size))
7675 old_size = max_size (old_size, true);
7677 /* If the size of the object is a constant, the new size must not be smaller
7678 (the front-end has verified this for scalar and packed array types). */
7679 if (TREE_CODE (old_size) != INTEGER_CST
7680 || TREE_OVERFLOW (old_size)
7681 || (AGGREGATE_TYPE_P (gnu_type)
7682 && !(TREE_CODE (gnu_type) == ARRAY_TYPE
7683 && TYPE_PACKED_ARRAY_TYPE_P (gnu_type))
7684 && !(TYPE_IS_PADDING_P (gnu_type)
7685 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE
7686 && TYPE_PACKED_ARRAY_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_type))))
7687 && tree_int_cst_lt (size, old_size)))
7689 if (Present (gnat_attr_node))
7691 ("Value_Size for& too small{, minimum allowed is ^}",
7692 gnat_attr_node, gnat_entity, old_size);
7696 /* Otherwise, set the RM size proper for integral types... */
7697 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7698 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7699 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7700 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7701 SET_TYPE_RM_SIZE (gnu_type, size);
7703 /* ...or the Ada size for record and union types. */
7704 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7705 || TREE_CODE (gnu_type) == UNION_TYPE
7706 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7707 && !TYPE_FAT_POINTER_P (gnu_type))
7708 SET_TYPE_ADA_SIZE (gnu_type, size);
7711 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7712 If TYPE is the best type, return it. Otherwise, make a new type. We
7713 only support new integral and pointer types. FOR_BIASED is true if
7714 we are making a biased type. */
7717 make_type_from_size (tree type, tree size_tree, bool for_biased)
7719 unsigned HOST_WIDE_INT size;
7723 /* If size indicates an error, just return TYPE to avoid propagating
7724 the error. Likewise if it's too large to represent. */
7725 if (!size_tree || !host_integerp (size_tree, 1))
7728 size = tree_low_cst (size_tree, 1);
7730 switch (TREE_CODE (type))
7735 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7736 && TYPE_BIASED_REPRESENTATION_P (type));
7738 /* Integer types with precision 0 are forbidden. */
7742 /* Only do something if the type is not a packed array type and
7743 doesn't already have the proper size. */
7744 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7745 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7748 biased_p |= for_biased;
7749 if (size > LONG_LONG_TYPE_SIZE)
7750 size = LONG_LONG_TYPE_SIZE;
7752 if (TYPE_UNSIGNED (type) || biased_p)
7753 new_type = make_unsigned_type (size);
7755 new_type = make_signed_type (size);
7756 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7757 SET_TYPE_RM_MIN_VALUE (new_type,
7758 convert (TREE_TYPE (new_type),
7759 TYPE_MIN_VALUE (type)));
7760 SET_TYPE_RM_MAX_VALUE (new_type,
7761 convert (TREE_TYPE (new_type),
7762 TYPE_MAX_VALUE (type)));
7763 /* Propagate the name to avoid creating a fake subrange type. */
7764 if (TYPE_NAME (type))
7766 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7767 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7769 TYPE_NAME (new_type) = TYPE_NAME (type);
7771 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7772 SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
7776 /* Do something if this is a fat pointer, in which case we
7777 may need to return the thin pointer. */
7778 if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7780 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7781 if (!targetm.valid_pointer_mode (p_mode))
7784 build_pointer_type_for_mode
7785 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7791 /* Only do something if this is a thin pointer, in which case we
7792 may need to return the fat pointer. */
7793 if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7795 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7805 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7806 a type or object whose present alignment is ALIGN. If this alignment is
7807 valid, return it. Otherwise, give an error and return ALIGN. */
7810 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7812 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7813 unsigned int new_align;
7814 Node_Id gnat_error_node;
7816 /* Don't worry about checking alignment if alignment was not specified
7817 by the source program and we already posted an error for this entity. */
7818 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7821 /* Post the error on the alignment clause if any. Note, for the implicit
7822 base type of an array type, the alignment clause is on the first
7824 if (Present (Alignment_Clause (gnat_entity)))
7825 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7827 else if (Is_Itype (gnat_entity)
7828 && Is_Array_Type (gnat_entity)
7829 && Etype (gnat_entity) == gnat_entity
7830 && Present (Alignment_Clause (First_Subtype (gnat_entity))))
7832 Expression (Alignment_Clause (First_Subtype (gnat_entity)));
7835 gnat_error_node = gnat_entity;
7837 /* Within GCC, an alignment is an integer, so we must make sure a value is
7838 specified that fits in that range. Also, there is an upper bound to
7839 alignments we can support/allow. */
7840 if (!UI_Is_In_Int_Range (alignment)
7841 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7842 post_error_ne_num ("largest supported alignment for& is ^",
7843 gnat_error_node, gnat_entity, max_allowed_alignment);
7844 else if (!(Present (Alignment_Clause (gnat_entity))
7845 && From_At_Mod (Alignment_Clause (gnat_entity)))
7846 && new_align * BITS_PER_UNIT < align)
7848 unsigned int double_align;
7849 bool is_capped_double, align_clause;
7851 /* If the default alignment of "double" or larger scalar types is
7852 specifically capped and the new alignment is above the cap, do
7853 not post an error and change the alignment only if there is an
7854 alignment clause; this makes it possible to have the associated
7855 GCC type overaligned by default for performance reasons. */
7856 if ((double_align = double_float_alignment) > 0)
7859 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7861 = is_double_float_or_array (gnat_type, &align_clause);
7863 else if ((double_align = double_scalar_alignment) > 0)
7866 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7868 = is_double_scalar_or_array (gnat_type, &align_clause);
7871 is_capped_double = align_clause = false;
7873 if (is_capped_double && new_align >= double_align)
7876 align = new_align * BITS_PER_UNIT;
7880 if (is_capped_double)
7881 align = double_align * BITS_PER_UNIT;
7883 post_error_ne_num ("alignment for& must be at least ^",
7884 gnat_error_node, gnat_entity,
7885 align / BITS_PER_UNIT);
7890 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7891 if (new_align > align)
7898 /* Return the smallest alignment not less than SIZE. */
7901 ceil_alignment (unsigned HOST_WIDE_INT size)
7903 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7906 /* Verify that OBJECT, a type or decl, is something we can implement
7907 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7908 if we require atomic components. */
7911 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7913 Node_Id gnat_error_point = gnat_entity;
7915 enum machine_mode mode;
7919 /* There are three case of what OBJECT can be. It can be a type, in which
7920 case we take the size, alignment and mode from the type. It can be a
7921 declaration that was indirect, in which case the relevant values are
7922 that of the type being pointed to, or it can be a normal declaration,
7923 in which case the values are of the decl. The code below assumes that
7924 OBJECT is either a type or a decl. */
7925 if (TYPE_P (object))
7927 /* If this is an anonymous base type, nothing to check. Error will be
7928 reported on the source type. */
7929 if (!Comes_From_Source (gnat_entity))
7932 mode = TYPE_MODE (object);
7933 align = TYPE_ALIGN (object);
7934 size = TYPE_SIZE (object);
7936 else if (DECL_BY_REF_P (object))
7938 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7939 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7940 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7944 mode = DECL_MODE (object);
7945 align = DECL_ALIGN (object);
7946 size = DECL_SIZE (object);
7949 /* Consider all floating-point types atomic and any types that that are
7950 represented by integers no wider than a machine word. */
7951 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7952 || ((GET_MODE_CLASS (mode) == MODE_INT
7953 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7954 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7957 /* For the moment, also allow anything that has an alignment equal
7958 to its size and which is smaller than a word. */
7959 if (size && TREE_CODE (size) == INTEGER_CST
7960 && compare_tree_int (size, align) == 0
7961 && align <= BITS_PER_WORD)
7964 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7965 gnat_node = Next_Rep_Item (gnat_node))
7967 if (!comp_p && Nkind (gnat_node) == N_Pragma
7968 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7970 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7971 else if (comp_p && Nkind (gnat_node) == N_Pragma
7972 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7973 == Pragma_Atomic_Components))
7974 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7978 post_error_ne ("atomic access to component of & cannot be guaranteed",
7979 gnat_error_point, gnat_entity);
7981 post_error_ne ("atomic access to & cannot be guaranteed",
7982 gnat_error_point, gnat_entity);
7985 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7986 have compatible signatures so that a call using one type may be safely
7987 issued if the actual target function type is the other. Return 1 if it is
7988 the case, 0 otherwise, and post errors on the incompatibilities.
7990 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7991 that calls to the subprogram will have arguments suitable for the later
7992 underlying builtin expansion. */
7995 compatible_signatures_p (tree ftype1, tree ftype2)
7997 /* As of now, we only perform very trivial tests and consider it's the
7998 programmer's responsibility to ensure the type correctness in the Ada
7999 declaration, as in the regular Import cases.
8001 Mismatches typically result in either error messages from the builtin
8002 expander, internal compiler errors, or in a real call sequence. This
8003 should be refined to issue diagnostics helping error detection and
8006 /* Almost fake test, ensuring a use of each argument. */
8007 if (ftype1 == ftype2)
8013 /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type
8014 and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the
8015 specified size for this field. POS_LIST is a position list describing
8016 the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied
8020 create_field_decl_from (tree old_field, tree field_type, tree record_type,
8021 tree size, tree pos_list, tree subst_list)
8023 tree t = TREE_VALUE (purpose_member (old_field, pos_list));
8024 tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2);
8025 unsigned int offset_align = tree_low_cst (TREE_VEC_ELT (t, 1), 1);
8026 tree new_pos, new_field;
8028 if (CONTAINS_PLACEHOLDER_P (pos))
8029 for (t = subst_list; t; t = TREE_CHAIN (t))
8030 pos = SUBSTITUTE_IN_EXPR (pos, TREE_PURPOSE (t), TREE_VALUE (t));
8032 /* If the position is now a constant, we can set it as the position of the
8033 field when we make it. Otherwise, we need to deal with it specially. */
8034 if (TREE_CONSTANT (pos))
8035 new_pos = bit_from_pos (pos, bitpos);
8037 new_pos = NULL_TREE;
8040 = create_field_decl (DECL_NAME (old_field), field_type, record_type,
8041 DECL_PACKED (old_field), size, new_pos,
8042 !DECL_NONADDRESSABLE_P (old_field));
8046 normalize_offset (&pos, &bitpos, offset_align);
8047 DECL_FIELD_OFFSET (new_field) = pos;
8048 DECL_FIELD_BIT_OFFSET (new_field) = bitpos;
8049 SET_DECL_OFFSET_ALIGN (new_field, offset_align);
8050 DECL_SIZE (new_field) = size;
8051 DECL_SIZE_UNIT (new_field)
8052 = convert (sizetype,
8053 size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node));
8054 layout_decl (new_field, DECL_OFFSET_ALIGN (new_field));
8057 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
8058 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
8059 DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field);
8060 TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field);
8065 /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */
8068 get_rep_part (tree record_type)
8070 tree field = TYPE_FIELDS (record_type);
8072 /* The REP part is the first field, internal, another record, and its name
8073 doesn't start with an underscore (i.e. is not generated by the FE). */
8074 if (DECL_INTERNAL_P (field)
8075 && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
8076 && IDENTIFIER_POINTER (DECL_NAME (field)) [0] != '_')
8082 /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */
8085 get_variant_part (tree record_type)
8089 /* The variant part is the only internal field that is a qualified union. */
8090 for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
8091 if (DECL_INTERNAL_P (field)
8092 && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE)
8098 /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is
8099 the list of variants to be used and RECORD_TYPE is the type of the parent.
8100 POS_LIST is a position list describing the layout of fields present in
8101 OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this
8105 create_variant_part_from (tree old_variant_part, tree variant_list,
8106 tree record_type, tree pos_list, tree subst_list)
8108 tree offset = DECL_FIELD_OFFSET (old_variant_part);
8109 tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part);
8110 tree old_union_type = TREE_TYPE (old_variant_part);
8111 tree new_union_type, new_variant_part, t;
8112 tree union_field_list = NULL_TREE;
8114 /* First create the type of the variant part from that of the old one. */
8115 new_union_type = make_node (QUAL_UNION_TYPE);
8116 TYPE_NAME (new_union_type) = DECL_NAME (TYPE_NAME (old_union_type));
8118 /* If the position of the variant part is constant, subtract it from the
8119 size of the type of the parent to get the new size. This manual CSE
8120 reduces the code size when not optimizing. */
8121 if (TREE_CODE (offset) == INTEGER_CST && TREE_CODE (bitpos) == INTEGER_CST)
8123 tree first_bit = bit_from_pos (offset, bitpos);
8124 TYPE_SIZE (new_union_type)
8125 = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit);
8126 TYPE_SIZE_UNIT (new_union_type)
8127 = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type),
8128 byte_from_pos (offset, bitpos));
8129 SET_TYPE_ADA_SIZE (new_union_type,
8130 size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type),
8132 TYPE_ALIGN (new_union_type) = TYPE_ALIGN (old_union_type);
8133 relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY);
8136 copy_and_substitute_in_size (new_union_type, old_union_type, subst_list);
8138 /* Now finish up the new variants and populate the union type. */
8139 for (t = variant_list; t; t = TREE_CHAIN (t))
8141 tree old_field = TREE_VEC_ELT (TREE_VALUE (t), 0), new_field;
8142 tree old_variant, old_variant_subpart, new_variant, field_list;
8144 /* Skip variants that don't belong to this nesting level. */
8145 if (DECL_CONTEXT (old_field) != old_union_type)
8148 /* Retrieve the list of fields already added to the new variant. */
8149 new_variant = TREE_VEC_ELT (TREE_VALUE (t), 2);
8150 field_list = TYPE_FIELDS (new_variant);
8152 /* If the old variant had a variant subpart, we need to create a new
8153 variant subpart and add it to the field list. */
8154 old_variant = TREE_PURPOSE (t);
8155 old_variant_subpart = get_variant_part (old_variant);
8156 if (old_variant_subpart)
8158 tree new_variant_subpart
8159 = create_variant_part_from (old_variant_subpart, variant_list,
8160 new_variant, pos_list, subst_list);
8161 TREE_CHAIN (new_variant_subpart) = field_list;
8162 field_list = new_variant_subpart;
8165 /* Finish up the new variant and create the field. No need for debug
8166 info thanks to the XVS type. */
8167 finish_record_type (new_variant, nreverse (field_list), 2, false);
8168 compute_record_mode (new_variant);
8169 create_type_decl (TYPE_NAME (new_variant), new_variant, NULL,
8170 true, false, Empty);
8173 = create_field_decl_from (old_field, new_variant, new_union_type,
8174 TYPE_SIZE (new_variant),
8175 pos_list, subst_list);
8176 DECL_QUALIFIER (new_field) = TREE_VEC_ELT (TREE_VALUE (t), 1);
8177 DECL_INTERNAL_P (new_field) = 1;
8178 TREE_CHAIN (new_field) = union_field_list;
8179 union_field_list = new_field;
8182 /* Finish up the union type and create the variant part. No need for debug
8183 info thanks to the XVS type. */
8184 finish_record_type (new_union_type, union_field_list, 2, false);
8185 compute_record_mode (new_union_type);
8186 create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL,
8187 true, false, Empty);
8190 = create_field_decl_from (old_variant_part, new_union_type, record_type,
8191 TYPE_SIZE (new_union_type),
8192 pos_list, subst_list);
8193 DECL_INTERNAL_P (new_variant_part) = 1;
8195 /* With multiple discriminants it is possible for an inner variant to be
8196 statically selected while outer ones are not; in this case, the list
8197 of fields of the inner variant is not flattened and we end up with a
8198 qualified union with a single member. Drop the useless container. */
8199 if (!TREE_CHAIN (union_field_list))
8201 DECL_CONTEXT (union_field_list) = record_type;
8202 DECL_FIELD_OFFSET (union_field_list)
8203 = DECL_FIELD_OFFSET (new_variant_part);
8204 DECL_FIELD_BIT_OFFSET (union_field_list)
8205 = DECL_FIELD_BIT_OFFSET (new_variant_part);
8206 SET_DECL_OFFSET_ALIGN (union_field_list,
8207 DECL_OFFSET_ALIGN (new_variant_part));
8208 new_variant_part = union_field_list;
8211 return new_variant_part;
8214 /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE,
8215 which are both RECORD_TYPE, after applying the substitutions described
8219 copy_and_substitute_in_size (tree new_type, tree old_type, tree subst_list)
8223 TYPE_SIZE (new_type) = TYPE_SIZE (old_type);
8224 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type);
8225 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type));
8226 TYPE_ALIGN (new_type) = TYPE_ALIGN (old_type);
8227 relate_alias_sets (new_type, old_type, ALIAS_SET_COPY);
8229 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type)))
8230 for (t = subst_list; t; t = TREE_CHAIN (t))
8231 TYPE_SIZE (new_type)
8232 = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type),
8236 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type)))
8237 for (t = subst_list; t; t = TREE_CHAIN (t))
8238 TYPE_SIZE_UNIT (new_type)
8239 = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type),
8243 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type)))
8244 for (t = subst_list; t; t = TREE_CHAIN (t))
8246 (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type),
8250 /* Finalize the size. */
8251 TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type));
8252 TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type));
8255 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
8256 type with all size expressions that contain F in a PLACEHOLDER_EXPR
8257 updated by replacing F with R.
8259 The function doesn't update the layout of the type, i.e. it assumes
8260 that the substitution is purely formal. That's why the replacement
8261 value R must itself contain a PLACEHOLDER_EXPR. */
8264 substitute_in_type (tree t, tree f, tree r)
8268 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
8270 switch (TREE_CODE (t))
8277 /* First the domain types of arrays. */
8278 if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t))
8279 || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t)))
8281 tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r);
8282 tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r);
8284 if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t))
8288 TYPE_GCC_MIN_VALUE (nt) = low;
8289 TYPE_GCC_MAX_VALUE (nt) = high;
8291 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t))
8293 (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
8298 /* Then the subtypes. */
8299 if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t))
8300 || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t)))
8302 tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r);
8303 tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r);
8305 if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t))
8309 SET_TYPE_RM_MIN_VALUE (nt, low);
8310 SET_TYPE_RM_MAX_VALUE (nt, high);
8318 nt = substitute_in_type (TREE_TYPE (t), f, r);
8319 if (nt == TREE_TYPE (t))
8322 return build_complex_type (nt);
8328 /* These should never show up here. */
8333 tree component = substitute_in_type (TREE_TYPE (t), f, r);
8334 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
8336 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
8339 nt = build_array_type (component, domain);
8340 TYPE_ALIGN (nt) = TYPE_ALIGN (t);
8341 TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t);
8342 SET_TYPE_MODE (nt, TYPE_MODE (t));
8343 TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
8344 TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
8345 TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t);
8346 TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t);
8347 TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t);
8353 case QUAL_UNION_TYPE:
8355 bool changed_field = false;
8358 /* Start out with no fields, make new fields, and chain them
8359 in. If we haven't actually changed the type of any field,
8360 discard everything we've done and return the old type. */
8362 TYPE_FIELDS (nt) = NULL_TREE;
8364 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
8366 tree new_field = copy_node (field), new_n;
8368 new_n = substitute_in_type (TREE_TYPE (field), f, r);
8369 if (new_n != TREE_TYPE (field))
8371 TREE_TYPE (new_field) = new_n;
8372 changed_field = true;
8375 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
8376 if (new_n != DECL_FIELD_OFFSET (field))
8378 DECL_FIELD_OFFSET (new_field) = new_n;
8379 changed_field = true;
8382 /* Do the substitution inside the qualifier, if any. */
8383 if (TREE_CODE (t) == QUAL_UNION_TYPE)
8385 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
8386 if (new_n != DECL_QUALIFIER (field))
8388 DECL_QUALIFIER (new_field) = new_n;
8389 changed_field = true;
8393 DECL_CONTEXT (new_field) = nt;
8394 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field);
8396 TREE_CHAIN (new_field) = TYPE_FIELDS (nt);
8397 TYPE_FIELDS (nt) = new_field;
8403 TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt));
8404 TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
8405 TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
8406 SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
8415 /* Return the RM size of GNU_TYPE. This is the actual number of bits
8416 needed to represent the object. */
8419 rm_size (tree gnu_type)
8421 /* For integral types, we store the RM size explicitly. */
8422 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
8423 return TYPE_RM_SIZE (gnu_type);
8425 /* Return the RM size of the actual data plus the size of the template. */
8426 if (TREE_CODE (gnu_type) == RECORD_TYPE
8427 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
8429 size_binop (PLUS_EXPR,
8430 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
8431 DECL_SIZE (TYPE_FIELDS (gnu_type)));
8433 /* For record types, we store the size explicitly. */
8434 if ((TREE_CODE (gnu_type) == RECORD_TYPE
8435 || TREE_CODE (gnu_type) == UNION_TYPE
8436 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
8437 && !TYPE_FAT_POINTER_P (gnu_type)
8438 && TYPE_ADA_SIZE (gnu_type))
8439 return TYPE_ADA_SIZE (gnu_type);
8441 /* For other types, this is just the size. */
8442 return TYPE_SIZE (gnu_type);
8445 /* Return the name to be used for GNAT_ENTITY. If a type, create a
8446 fully-qualified name, possibly with type information encoding.
8447 Otherwise, return the name. */
8450 get_entity_name (Entity_Id gnat_entity)
8452 Get_Encoded_Name (gnat_entity);
8453 return get_identifier_with_length (Name_Buffer, Name_Len);
8456 /* Return an identifier representing the external name to be used for
8457 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
8458 and the specified suffix. */
8461 create_concat_name (Entity_Id gnat_entity, const char *suffix)
8463 Entity_Kind kind = Ekind (gnat_entity);
8467 String_Template temp = {1, strlen (suffix)};
8468 Fat_Pointer fp = {suffix, &temp};
8469 Get_External_Name_With_Suffix (gnat_entity, fp);
8472 Get_External_Name (gnat_entity, 0);
8474 /* A variable using the Stdcall convention lives in a DLL. We adjust
8475 its name to use the jump table, the _imp__NAME contains the address
8476 for the NAME variable. */
8477 if ((kind == E_Variable || kind == E_Constant)
8478 && Has_Stdcall_Convention (gnat_entity))
8480 const int len = 6 + Name_Len;
8481 char *new_name = (char *) alloca (len + 1);
8482 strcpy (new_name, "_imp__");
8483 strcat (new_name, Name_Buffer);
8484 return get_identifier_with_length (new_name, len);
8487 return get_identifier_with_length (Name_Buffer, Name_Len);
8490 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
8491 string, return a new IDENTIFIER_NODE that is the concatenation of
8492 the name followed by "___" and the specified suffix. */
8495 concat_name (tree gnu_name, const char *suffix)
8497 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
8498 char *new_name = (char *) alloca (len + 1);
8499 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
8500 strcat (new_name, "___");
8501 strcat (new_name, suffix);
8502 return get_identifier_with_length (new_name, len);
8505 #include "gt-ada-decl.h"
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