1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2008, 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"
56 #ifndef MAX_FIXED_MODE_SIZE
57 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
60 /* Convention_Stdcall should be processed in a specific way on Windows targets
61 only. The macro below is a helper to avoid having to check for a Windows
62 specific attribute throughout this unit. */
64 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
65 #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall)
67 #define Has_Stdcall_Convention(E) (0)
70 /* Stack realignment for functions with foreign conventions is provided on a
71 per back-end basis now, as it is handled by the prologue expanders and not
72 as part of the function's body any more. It might be requested by way of a
73 dedicated function type attribute on the targets that support it.
75 We need a way to avoid setting the attribute on the targets that don't
76 support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose.
78 It is defined on targets where the circuitry is available, and indicates
79 whether the realignment is needed for 'main'. We use this to decide for
80 foreign subprograms as well.
82 It is not defined on targets where the circuitry is not implemented, and
83 we just never set the attribute in these cases.
85 Whether it is defined on all targets that would need it in theory is
86 not entirely clear. We currently trust the base GCC settings for this
89 #ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
90 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 0
95 struct incomplete *next;
100 /* These variables are used to defer recursively expanding incomplete types
101 while we are processing an array, a record or a subprogram type. */
102 static int defer_incomplete_level = 0;
103 static struct incomplete *defer_incomplete_list;
105 /* This variable is used to delay expanding From_With_Type types until the
107 static struct incomplete *defer_limited_with;
109 /* These variables are used to defer finalizing types. The element of the
110 list is the TYPE_DECL associated with the type. */
111 static int defer_finalize_level = 0;
112 static VEC (tree,heap) *defer_finalize_list;
114 /* A hash table used to cache the result of annotate_value. */
115 static GTY ((if_marked ("tree_int_map_marked_p"),
116 param_is (struct tree_int_map))) htab_t annotate_value_cache;
118 static void copy_alias_set (tree, tree);
119 static tree substitution_list (Entity_Id, Entity_Id, tree, bool);
120 static bool allocatable_size_p (tree, bool);
121 static void prepend_one_attribute_to (struct attrib **,
122 enum attr_type, tree, tree, Node_Id);
123 static void prepend_attributes (Entity_Id, struct attrib **);
124 static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool);
125 static bool is_variable_size (tree);
126 static tree elaborate_expression_1 (Node_Id, Entity_Id, tree, tree,
128 static tree make_packable_type (tree, bool);
129 static tree gnat_to_gnu_field (Entity_Id, tree, int, bool);
130 static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool,
132 static bool same_discriminant_p (Entity_Id, Entity_Id);
133 static bool array_type_has_nonaliased_component (Entity_Id, tree);
134 static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
135 bool, bool, bool, bool);
136 static Uint annotate_value (tree);
137 static void annotate_rep (Entity_Id, tree);
138 static tree compute_field_positions (tree, tree, tree, tree, unsigned int);
139 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
140 static void set_rm_size (Uint, tree, Entity_Id);
141 static tree make_type_from_size (tree, tree, bool);
142 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
143 static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
144 static void check_ok_for_atomic (tree, Entity_Id, bool);
145 static int compatible_signatures_p (tree ftype1, tree ftype2);
146 static void rest_of_type_decl_compilation_no_defer (tree);
148 /* Return true if GNAT_ADDRESS is a compile time known value.
149 In particular catch System'To_Address. */
152 compile_time_known_address_p (Node_Id gnat_address)
154 return ((Nkind (gnat_address) == N_Unchecked_Type_Conversion
155 && Compile_Time_Known_Value (Expression (gnat_address)))
156 || Compile_Time_Known_Value (gnat_address));
159 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
160 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
161 refer to an Ada type. */
164 gnat_to_gnu_type (Entity_Id gnat_entity)
168 /* The back end never attempts to annotate generic types */
169 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
170 return void_type_node;
172 /* Convert the ada entity type into a GCC TYPE_DECL node. */
173 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
174 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
175 return TREE_TYPE (gnu_decl);
178 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
179 entity, this routine returns the equivalent GCC tree for that entity
180 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
183 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
184 initial value (in GCC tree form). This is optional for variables.
185 For renamed entities, GNU_EXPR gives the object being renamed.
187 DEFINITION is nonzero if this call is intended for a definition. This is
188 used for separate compilation where it necessary to know whether an
189 external declaration or a definition should be created if the GCC equivalent
190 was not created previously. The value of 1 is normally used for a nonzero
191 DEFINITION, but a value of 2 is used in special circumstances, defined in
195 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
197 Entity_Id gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
199 tree gnu_type = NULL_TREE;
200 /* Contains the gnu XXXX_DECL tree node which is equivalent to the input
201 GNAT tree. This node will be associated with the GNAT node by calling
202 the save_gnu_tree routine at the end of the `switch' statement. */
203 tree gnu_decl = NULL_TREE;
204 /* true if we have already saved gnu_decl as a gnat association. */
206 /* Nonzero if we incremented defer_incomplete_level. */
207 bool this_deferred = false;
208 /* Nonzero if we incremented force_global. */
209 bool this_global = false;
210 /* Nonzero if we should check to see if elaborated during processing. */
211 bool maybe_present = false;
212 /* Nonzero if we made GNU_DECL and its type here. */
213 bool this_made_decl = false;
214 struct attrib *attr_list = NULL;
215 bool debug_info_p = (Needs_Debug_Info (gnat_entity)
216 || debug_info_level == DINFO_LEVEL_VERBOSE);
217 Entity_Kind kind = Ekind (gnat_entity);
220 = ((Known_Esize (gnat_entity)
221 && UI_Is_In_Int_Range (Esize (gnat_entity)))
222 ? MIN (UI_To_Int (Esize (gnat_entity)),
223 IN (kind, Float_Kind)
224 ? fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE)
225 : IN (kind, Access_Kind) ? POINTER_SIZE * 2
226 : LONG_LONG_TYPE_SIZE)
227 : LONG_LONG_TYPE_SIZE);
230 = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity)));
231 unsigned int align = 0;
233 /* Since a use of an Itype is a definition, process it as such if it
234 is not in a with'ed unit. */
236 if (!definition && Is_Itype (gnat_entity)
237 && !present_gnu_tree (gnat_entity)
238 && In_Extended_Main_Code_Unit (gnat_entity))
240 /* Ensure that we are in a subprogram mentioned in the Scope
241 chain of this entity, our current scope is global,
242 or that we encountered a task or entry (where we can't currently
243 accurately check scoping). */
244 if (!current_function_decl
245 || DECL_ELABORATION_PROC_P (current_function_decl))
247 process_type (gnat_entity);
248 return get_gnu_tree (gnat_entity);
251 for (gnat_temp = Scope (gnat_entity);
252 Present (gnat_temp); gnat_temp = Scope (gnat_temp))
254 if (Is_Type (gnat_temp))
255 gnat_temp = Underlying_Type (gnat_temp);
257 if (Ekind (gnat_temp) == E_Subprogram_Body)
259 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
261 if (IN (Ekind (gnat_temp), Subprogram_Kind)
262 && Present (Protected_Body_Subprogram (gnat_temp)))
263 gnat_temp = Protected_Body_Subprogram (gnat_temp);
265 if (Ekind (gnat_temp) == E_Entry
266 || Ekind (gnat_temp) == E_Entry_Family
267 || Ekind (gnat_temp) == E_Task_Type
268 || (IN (Ekind (gnat_temp), Subprogram_Kind)
269 && present_gnu_tree (gnat_temp)
270 && (current_function_decl
271 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
273 process_type (gnat_entity);
274 return get_gnu_tree (gnat_entity);
278 /* This abort means the entity "gnat_entity" has an incorrect scope,
279 i.e. that its scope does not correspond to the subprogram in which
284 /* If this is entity 0, something went badly wrong. */
285 gcc_assert (Present (gnat_entity));
287 /* If we've already processed this entity, return what we got last time.
288 If we are defining the node, we should not have already processed it.
289 In that case, we will abort below when we try to save a new GCC tree for
290 this object. We also need to handle the case of getting a dummy type
291 when a Full_View exists. */
293 if (present_gnu_tree (gnat_entity)
294 && (!definition || (Is_Type (gnat_entity) && imported_p)))
296 gnu_decl = get_gnu_tree (gnat_entity);
298 if (TREE_CODE (gnu_decl) == TYPE_DECL
299 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
300 && IN (kind, Incomplete_Or_Private_Kind)
301 && Present (Full_View (gnat_entity)))
303 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
306 save_gnu_tree (gnat_entity, NULL_TREE, false);
307 save_gnu_tree (gnat_entity, gnu_decl, false);
313 /* If this is a numeric or enumeral type, or an access type, a nonzero
314 Esize must be specified unless it was specified by the programmer. */
315 gcc_assert (!Unknown_Esize (gnat_entity)
316 || Has_Size_Clause (gnat_entity)
317 || (!IN (kind, Numeric_Kind) && !IN (kind, Enumeration_Kind)
318 && (!IN (kind, Access_Kind)
319 || kind == E_Access_Protected_Subprogram_Type
320 || kind == E_Anonymous_Access_Protected_Subprogram_Type
321 || kind == E_Access_Subtype)));
323 /* Likewise, RM_Size must be specified for all discrete and fixed-point
325 gcc_assert (!IN (kind, Discrete_Or_Fixed_Point_Kind)
326 || !Unknown_RM_Size (gnat_entity));
328 /* Get the name of the entity and set up the line number and filename of
329 the original definition for use in any decl we make. */
330 gnu_entity_id = get_entity_name (gnat_entity);
331 Sloc_to_locus (Sloc (gnat_entity), &input_location);
333 /* If we get here, it means we have not yet done anything with this
334 entity. If we are not defining it here, it must be external,
335 otherwise we should have defined it already. */
336 gcc_assert (definition || Is_Public (gnat_entity) || type_annotate_only
337 || kind == E_Discriminant || kind == E_Component
339 || (kind == E_Constant && Present (Full_View (gnat_entity)))
340 || IN (kind, Type_Kind));
342 /* For cases when we are not defining (i.e., we are referencing from
343 another compilation unit) Public entities, show we are at global level
344 for the purpose of computing scopes. Don't do this for components or
345 discriminants since the relevant test is whether or not the record is
346 being defined. But do this for Imported functions or procedures in
348 if ((!definition && Is_Public (gnat_entity)
349 && !Is_Statically_Allocated (gnat_entity)
350 && kind != E_Discriminant && kind != E_Component)
351 || (Is_Imported (gnat_entity)
352 && (kind == E_Function || kind == E_Procedure)))
353 force_global++, this_global = true;
355 /* Handle any attributes directly attached to the entity. */
356 if (Has_Gigi_Rep_Item (gnat_entity))
357 prepend_attributes (gnat_entity, &attr_list);
359 /* Machine_Attributes on types are expected to be propagated to subtypes.
360 The corresponding Gigi_Rep_Items are only attached to the first subtype
361 though, so we handle the propagation here. */
362 if (Is_Type (gnat_entity) && Base_Type (gnat_entity) != gnat_entity
363 && !Is_First_Subtype (gnat_entity)
364 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
365 prepend_attributes (First_Subtype (Base_Type (gnat_entity)), &attr_list);
370 /* If this is a use of a deferred constant without address clause,
371 get its full definition. */
373 && No (Address_Clause (gnat_entity))
374 && Present (Full_View (gnat_entity)))
377 = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
382 /* If we have an external constant that we are not defining, get the
383 expression that is was defined to represent. We may throw that
384 expression away later if it is not a constant. Do not retrieve the
385 expression if it is an aggregate or allocator, because in complex
386 instantiation contexts it may not be expanded */
388 && Present (Expression (Declaration_Node (gnat_entity)))
389 && !No_Initialization (Declaration_Node (gnat_entity))
390 && (Nkind (Expression (Declaration_Node (gnat_entity)))
392 && (Nkind (Expression (Declaration_Node (gnat_entity)))
394 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
396 /* Ignore deferred constant definitions without address clause since
397 they are processed fully in the front-end. If No_Initialization
398 is set, this is not a deferred constant but a constant whose value
399 is built manually. And constants that are renamings are handled
403 && No (Address_Clause (gnat_entity))
404 && !No_Initialization (Declaration_Node (gnat_entity))
405 && No (Renamed_Object (gnat_entity)))
407 gnu_decl = error_mark_node;
412 /* Ignore constant definitions already marked with the error node. See
413 the N_Object_Declaration case of gnat_to_gnu for the rationale. */
416 && present_gnu_tree (gnat_entity)
417 && get_gnu_tree (gnat_entity) == error_mark_node)
419 maybe_present = true;
426 /* We used to special case VMS exceptions here to directly map them to
427 their associated condition code. Since this code had to be masked
428 dynamically to strip off the severity bits, this caused trouble in
429 the GCC/ZCX case because the "type" pointers we store in the tables
430 have to be static. We now don't special case here anymore, and let
431 the regular processing take place, which leaves us with a regular
432 exception data object for VMS exceptions too. The condition code
433 mapping is taken care of by the front end and the bitmasking by the
440 /* The GNAT record where the component was defined. */
441 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
443 /* If the variable is an inherited record component (in the case of
444 extended record types), just return the inherited entity, which
445 must be a FIELD_DECL. Likewise for discriminants.
446 For discriminants of untagged records which have explicit
447 stored discriminants, return the entity for the corresponding
448 stored discriminant. Also use Original_Record_Component
449 if the record has a private extension. */
451 if (Present (Original_Record_Component (gnat_entity))
452 && Original_Record_Component (gnat_entity) != gnat_entity)
455 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
456 gnu_expr, definition);
461 /* If the enclosing record has explicit stored discriminants,
462 then it is an untagged record. If the Corresponding_Discriminant
463 is not empty then this must be a renamed discriminant and its
464 Original_Record_Component must point to the corresponding explicit
465 stored discriminant (i.e., we should have taken the previous
468 else if (Present (Corresponding_Discriminant (gnat_entity))
469 && Is_Tagged_Type (gnat_record))
471 /* A tagged record has no explicit stored discriminants. */
473 gcc_assert (First_Discriminant (gnat_record)
474 == First_Stored_Discriminant (gnat_record));
476 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
477 gnu_expr, definition);
482 else if (Present (CR_Discriminant (gnat_entity))
483 && type_annotate_only)
485 gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
486 gnu_expr, definition);
491 /* If the enclosing record has explicit stored discriminants, then
492 it is an untagged record. If the Corresponding_Discriminant
493 is not empty then this must be a renamed discriminant and its
494 Original_Record_Component must point to the corresponding explicit
495 stored discriminant (i.e., we should have taken the first
498 else if (Present (Corresponding_Discriminant (gnat_entity))
499 && (First_Discriminant (gnat_record)
500 != First_Stored_Discriminant (gnat_record)))
503 /* Otherwise, if we are not defining this and we have no GCC type
504 for the containing record, make one for it. Then we should
505 have made our own equivalent. */
506 else if (!definition && !present_gnu_tree (gnat_record))
508 /* ??? If this is in a record whose scope is a protected
509 type and we have an Original_Record_Component, use it.
510 This is a workaround for major problems in protected type
512 Entity_Id Scop = Scope (Scope (gnat_entity));
513 if ((Is_Protected_Type (Scop)
514 || (Is_Private_Type (Scop)
515 && Present (Full_View (Scop))
516 && Is_Protected_Type (Full_View (Scop))))
517 && Present (Original_Record_Component (gnat_entity)))
520 = gnat_to_gnu_entity (Original_Record_Component
527 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
528 gnu_decl = get_gnu_tree (gnat_entity);
534 /* Here we have no GCC type and this is a reference rather than a
535 definition. This should never happen. Most likely the cause is
536 reference before declaration in the gnat tree for gnat_entity. */
540 case E_Loop_Parameter:
541 case E_Out_Parameter:
544 /* Simple variables, loop variables, Out parameters, and exceptions. */
547 bool used_by_ref = false;
549 = ((kind == E_Constant || kind == E_Variable)
550 && Is_True_Constant (gnat_entity)
551 && !Treat_As_Volatile (gnat_entity)
552 && (((Nkind (Declaration_Node (gnat_entity))
553 == N_Object_Declaration)
554 && Present (Expression (Declaration_Node (gnat_entity))))
555 || Present (Renamed_Object (gnat_entity))));
556 bool inner_const_flag = const_flag;
557 bool static_p = Is_Statically_Allocated (gnat_entity);
558 bool mutable_p = false;
559 tree gnu_ext_name = NULL_TREE;
560 tree renamed_obj = NULL_TREE;
561 tree gnu_object_size;
563 if (Present (Renamed_Object (gnat_entity)) && !definition)
565 if (kind == E_Exception)
566 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
569 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
572 /* Get the type after elaborating the renamed object. */
573 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
575 /* For a debug renaming declaration, build a pure debug entity. */
576 if (Present (Debug_Renaming_Link (gnat_entity)))
579 gnu_decl = build_decl (VAR_DECL, gnu_entity_id, gnu_type);
580 /* The (MEM (CONST (0))) pattern is prescribed by STABS. */
581 if (global_bindings_p ())
582 addr = gen_rtx_CONST (VOIDmode, const0_rtx);
584 addr = stack_pointer_rtx;
585 SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
586 gnat_pushdecl (gnu_decl, gnat_entity);
590 /* If this is a loop variable, its type should be the base type.
591 This is because the code for processing a loop determines whether
592 a normal loop end test can be done by comparing the bounds of the
593 loop against those of the base type, which is presumed to be the
594 size used for computation. But this is not correct when the size
595 of the subtype is smaller than the type. */
596 if (kind == E_Loop_Parameter)
597 gnu_type = get_base_type (gnu_type);
599 /* Reject non-renamed objects whose types are unconstrained arrays or
600 any object whose type is a dummy type or VOID_TYPE. */
602 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
603 && No (Renamed_Object (gnat_entity)))
604 || TYPE_IS_DUMMY_P (gnu_type)
605 || TREE_CODE (gnu_type) == VOID_TYPE)
607 gcc_assert (type_annotate_only);
610 return error_mark_node;
613 /* If an alignment is specified, use it if valid. Note that
614 exceptions are objects but don't have alignments. We must do this
615 before we validate the size, since the alignment can affect the
617 if (kind != E_Exception && Known_Alignment (gnat_entity))
619 gcc_assert (Present (Alignment (gnat_entity)));
620 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
621 TYPE_ALIGN (gnu_type));
622 gnu_type = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
623 "PAD", false, definition, true);
626 /* If we are defining the object, see if it has a Size value and
627 validate it if so. If we are not defining the object and a Size
628 clause applies, simply retrieve the value. We don't want to ignore
629 the clause and it is expected to have been validated already. Then
630 get the new type, if any. */
632 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
633 gnat_entity, VAR_DECL, false,
634 Has_Size_Clause (gnat_entity));
635 else if (Has_Size_Clause (gnat_entity))
636 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
641 = make_type_from_size (gnu_type, gnu_size,
642 Has_Biased_Representation (gnat_entity));
644 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
645 gnu_size = NULL_TREE;
648 /* If this object has self-referential size, it must be a record with
649 a default value. We are supposed to allocate an object of the
650 maximum size in this case unless it is a constant with an
651 initializing expression, in which case we can get the size from
652 that. Note that the resulting size may still be a variable, so
653 this may end up with an indirect allocation. */
654 if (No (Renamed_Object (gnat_entity))
655 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
657 if (gnu_expr && kind == E_Constant)
659 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
660 if (CONTAINS_PLACEHOLDER_P (size))
662 /* If the initializing expression is itself a constant,
663 despite having a nominal type with self-referential
664 size, we can get the size directly from it. */
665 if (TREE_CODE (gnu_expr) == COMPONENT_REF
666 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
669 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
670 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
671 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
672 || DECL_READONLY_ONCE_ELAB
673 (TREE_OPERAND (gnu_expr, 0))))
674 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
677 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
682 /* We may have no GNU_EXPR because No_Initialization is
683 set even though there's an Expression. */
684 else if (kind == E_Constant
685 && (Nkind (Declaration_Node (gnat_entity))
686 == N_Object_Declaration)
687 && Present (Expression (Declaration_Node (gnat_entity))))
689 = TYPE_SIZE (gnat_to_gnu_type
691 (Expression (Declaration_Node (gnat_entity)))));
694 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
699 /* If the size is zero bytes, make it one byte since some linkers have
700 trouble with zero-sized objects. If the object will have a
701 template, that will make it nonzero so don't bother. Also avoid
702 doing that for an object renaming or an object with an address
703 clause, as we would lose useful information on the view size
704 (e.g. for null array slices) and we are not allocating the object
707 && integer_zerop (gnu_size)
708 && !TREE_OVERFLOW (gnu_size))
709 || (TYPE_SIZE (gnu_type)
710 && integer_zerop (TYPE_SIZE (gnu_type))
711 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
712 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
713 || !Is_Array_Type (Etype (gnat_entity)))
714 && !Present (Renamed_Object (gnat_entity))
715 && !Present (Address_Clause (gnat_entity)))
716 gnu_size = bitsize_unit_node;
718 /* If this is an object with no specified size and alignment, and
719 if either it is atomic or we are not optimizing alignment for
720 space and it is composite and not an exception, an Out parameter
721 or a reference to another object, and the size of its type is a
722 constant, set the alignment to the smallest one which is not
723 smaller than the size, with an appropriate cap. */
724 if (!gnu_size && align == 0
725 && (Is_Atomic (gnat_entity)
726 || (!Optimize_Alignment_Space (gnat_entity)
727 && kind != E_Exception
728 && kind != E_Out_Parameter
729 && Is_Composite_Type (Etype (gnat_entity))
730 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
732 && No (Renamed_Object (gnat_entity))
733 && No (Address_Clause (gnat_entity))))
734 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
736 /* No point in jumping through all the hoops needed in order
737 to support BIGGEST_ALIGNMENT if we don't really have to.
738 So we cap to the smallest alignment that corresponds to
739 a known efficient memory access pattern of the target. */
740 unsigned int align_cap = Is_Atomic (gnat_entity)
742 : get_mode_alignment (ptr_mode);
744 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
745 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
748 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
750 /* But make sure not to under-align the object. */
751 if (align <= TYPE_ALIGN (gnu_type))
754 /* And honor the minimum valid atomic alignment, if any. */
755 #ifdef MINIMUM_ATOMIC_ALIGNMENT
756 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
757 align = MINIMUM_ATOMIC_ALIGNMENT;
761 /* If the object is set to have atomic components, find the component
762 type and validate it.
764 ??? Note that we ignore Has_Volatile_Components on objects; it's
765 not at all clear what to do in that case. */
767 if (Has_Atomic_Components (gnat_entity))
769 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
770 ? TREE_TYPE (gnu_type) : gnu_type);
772 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
773 && TYPE_MULTI_ARRAY_P (gnu_inner))
774 gnu_inner = TREE_TYPE (gnu_inner);
776 check_ok_for_atomic (gnu_inner, gnat_entity, true);
779 /* Now check if the type of the object allows atomic access. Note
780 that we must test the type, even if this object has size and
781 alignment to allow such access, because we will be going
782 inside the padded record to assign to the object. We could fix
783 this by always copying via an intermediate value, but it's not
784 clear it's worth the effort. */
785 if (Is_Atomic (gnat_entity))
786 check_ok_for_atomic (gnu_type, gnat_entity, false);
788 /* If this is an aliased object with an unconstrained nominal subtype,
789 make a type that includes the template. */
790 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
791 && Is_Array_Type (Etype (gnat_entity))
792 && !type_annotate_only)
795 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
798 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
799 concat_id_with_name (gnu_entity_id,
803 #ifdef MINIMUM_ATOMIC_ALIGNMENT
804 /* If the size is a constant and no alignment is specified, force
805 the alignment to be the minimum valid atomic alignment. The
806 restriction on constant size avoids problems with variable-size
807 temporaries; if the size is variable, there's no issue with
808 atomic access. Also don't do this for a constant, since it isn't
809 necessary and can interfere with constant replacement. Finally,
810 do not do it for Out parameters since that creates an
811 size inconsistency with In parameters. */
812 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
813 && !FLOAT_TYPE_P (gnu_type)
814 && !const_flag && No (Renamed_Object (gnat_entity))
815 && !imported_p && No (Address_Clause (gnat_entity))
816 && kind != E_Out_Parameter
817 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
818 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
819 align = MINIMUM_ATOMIC_ALIGNMENT;
822 /* Make a new type with the desired size and alignment, if needed.
823 But do not take into account alignment promotions to compute the
824 size of the object. */
825 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
826 if (gnu_size || align > 0)
827 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
828 "PAD", false, definition,
829 gnu_size ? true : false);
831 /* If this is a renaming, avoid as much as possible to create a new
832 object. However, in several cases, creating it is required.
833 This processing needs to be applied to the raw expression so
834 as to make it more likely to rename the underlying object. */
835 if (Present (Renamed_Object (gnat_entity)))
837 bool create_normal_object = false;
839 /* If the renamed object had padding, strip off the reference
840 to the inner object and reset our type. */
841 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
842 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
844 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
845 /* Strip useless conversions around the object. */
846 || (TREE_CODE (gnu_expr) == NOP_EXPR
847 && gnat_types_compatible_p
848 (TREE_TYPE (gnu_expr),
849 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
851 gnu_expr = TREE_OPERAND (gnu_expr, 0);
852 gnu_type = TREE_TYPE (gnu_expr);
855 /* Case 1: If this is a constant renaming stemming from a function
856 call, treat it as a normal object whose initial value is what
857 is being renamed. RM 3.3 says that the result of evaluating a
858 function call is a constant object. As a consequence, it can
859 be the inner object of a constant renaming. In this case, the
860 renaming must be fully instantiated, i.e. it cannot be a mere
861 reference to (part of) an existing object. */
864 tree inner_object = gnu_expr;
865 while (handled_component_p (inner_object))
866 inner_object = TREE_OPERAND (inner_object, 0);
867 if (TREE_CODE (inner_object) == CALL_EXPR)
868 create_normal_object = true;
871 /* Otherwise, see if we can proceed with a stabilized version of
872 the renamed entity or if we need to make a new object. */
873 if (!create_normal_object)
875 tree maybe_stable_expr = NULL_TREE;
878 /* Case 2: If the renaming entity need not be materialized and
879 the renamed expression is something we can stabilize, use
880 that for the renaming. At the global level, we can only do
881 this if we know no SAVE_EXPRs need be made, because the
882 expression we return might be used in arbitrary conditional
883 branches so we must force the SAVE_EXPRs evaluation
884 immediately and this requires a function context. */
885 if (!Materialize_Entity (gnat_entity)
886 && (!global_bindings_p ()
887 || (staticp (gnu_expr)
888 && !TREE_SIDE_EFFECTS (gnu_expr))))
891 = maybe_stabilize_reference (gnu_expr, true, &stable);
895 gnu_decl = maybe_stable_expr;
896 /* ??? No DECL_EXPR is created so we need to mark
897 the expression manually lest it is shared. */
898 if (global_bindings_p ())
899 mark_visited (&gnu_decl);
900 save_gnu_tree (gnat_entity, gnu_decl, true);
905 /* The stabilization failed. Keep maybe_stable_expr
906 untouched here to let the pointer case below know
907 about that failure. */
910 /* Case 3: If this is a constant renaming and creating a
911 new object is allowed and cheap, treat it as a normal
912 object whose initial value is what is being renamed. */
913 if (const_flag && Is_Elementary_Type (Etype (gnat_entity)))
916 /* Case 4: Make this into a constant pointer to the object we
917 are to rename and attach the object to the pointer if it is
918 something we can stabilize.
920 From the proper scope, attached objects will be referenced
921 directly instead of indirectly via the pointer to avoid
922 subtle aliasing problems with non-addressable entities.
923 They have to be stable because we must not evaluate the
924 variables in the expression every time the renaming is used.
925 The pointer is called a "renaming" pointer in this case.
927 In the rare cases where we cannot stabilize the renamed
928 object, we just make a "bare" pointer, and the renamed
929 entity is always accessed indirectly through it. */
932 gnu_type = build_reference_type (gnu_type);
933 inner_const_flag = TREE_READONLY (gnu_expr);
936 /* If the previous attempt at stabilizing failed, there
937 is no point in trying again and we reuse the result
938 without attaching it to the pointer. In this case it
939 will only be used as the initializing expression of
940 the pointer and thus needs no special treatment with
941 regard to multiple evaluations. */
942 if (maybe_stable_expr)
945 /* Otherwise, try to stabilize and attach the expression
946 to the pointer if the stabilization succeeds.
948 Note that this might introduce SAVE_EXPRs and we don't
949 check whether we're at the global level or not. This
950 is fine since we are building a pointer initializer and
951 neither the pointer nor the initializing expression can
952 be accessed before the pointer elaboration has taken
953 place in a correct program.
955 These SAVE_EXPRs will be evaluated at the right place
956 by either the evaluation of the initializer for the
957 non-global case or the elaboration code for the global
958 case, and will be attached to the elaboration procedure
959 in the latter case. */
963 = maybe_stabilize_reference (gnu_expr, true, &stable);
966 renamed_obj = maybe_stable_expr;
968 /* Attaching is actually performed downstream, as soon
969 as we have a VAR_DECL for the pointer we make. */
973 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
975 gnu_size = NULL_TREE;
981 /* Make a volatile version of this object's type if we are to make
982 the object volatile. We also interpret 13.3(19) conservatively
983 and disallow any optimizations for an object covered by it. */
984 if ((Treat_As_Volatile (gnat_entity)
985 || (Is_Exported (gnat_entity)
986 /* Exclude exported constants created by the compiler,
987 which should boil down to static dispatch tables and
988 make it possible to put them in read-only memory. */
989 && (Comes_From_Source (gnat_entity) || !const_flag))
990 || Is_Imported (gnat_entity)
991 || Present (Address_Clause (gnat_entity)))
992 && !TYPE_VOLATILE (gnu_type))
993 gnu_type = build_qualified_type (gnu_type,
994 (TYPE_QUALS (gnu_type)
995 | TYPE_QUAL_VOLATILE));
997 /* If we are defining an aliased object whose nominal subtype is
998 unconstrained, the object is a record that contains both the
999 template and the object. If there is an initializer, it will
1000 have already been converted to the right type, but we need to
1001 create the template if there is no initializer. */
1004 && TREE_CODE (gnu_type) == RECORD_TYPE
1005 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1006 /* Beware that padding might have been introduced
1007 via maybe_pad_type above. */
1008 || (TYPE_IS_PADDING_P (gnu_type)
1009 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1011 && TYPE_CONTAINS_TEMPLATE_P
1012 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1015 = TYPE_IS_PADDING_P (gnu_type)
1016 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1017 : TYPE_FIELDS (gnu_type);
1020 = gnat_build_constructor
1024 build_template (TREE_TYPE (template_field),
1025 TREE_TYPE (TREE_CHAIN (template_field)),
1030 /* Convert the expression to the type of the object except in the
1031 case where the object's type is unconstrained or the object's type
1032 is a padded record whose field is of self-referential size. In
1033 the former case, converting will generate unnecessary evaluations
1034 of the CONSTRUCTOR to compute the size and in the latter case, we
1035 want to only copy the actual data. */
1037 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1038 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1039 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1040 && TYPE_IS_PADDING_P (gnu_type)
1041 && (CONTAINS_PLACEHOLDER_P
1042 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1043 gnu_expr = convert (gnu_type, gnu_expr);
1045 /* If this is a pointer and it does not have an initializing
1046 expression, initialize it to NULL, unless the object is
1049 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
1050 && !Is_Imported (gnat_entity) && !gnu_expr)
1051 gnu_expr = integer_zero_node;
1053 /* If we are defining the object and it has an Address clause, we must
1054 either get the address expression from the saved GCC tree for the
1055 object if it has a Freeze node, or elaborate the address expression
1056 here since the front-end has guaranteed that the elaboration has no
1057 effects in this case. */
1058 if (definition && Present (Address_Clause (gnat_entity)))
1061 = present_gnu_tree (gnat_entity)
1062 ? get_gnu_tree (gnat_entity)
1063 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1065 save_gnu_tree (gnat_entity, NULL_TREE, false);
1067 /* Ignore the size. It's either meaningless or was handled
1069 gnu_size = NULL_TREE;
1070 /* Convert the type of the object to a reference type that can
1071 alias everything as per 13.3(19). */
1073 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1074 gnu_address = convert (gnu_type, gnu_address);
1076 const_flag = !Is_Public (gnat_entity)
1077 || compile_time_known_address_p (Expression (Address_Clause
1080 /* If this is a deferred constant, the initializer is attached to
1082 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1085 (Expression (Declaration_Node (Full_View (gnat_entity))));
1087 /* If we don't have an initializing expression for the underlying
1088 variable, the initializing expression for the pointer is the
1089 specified address. Otherwise, we have to make a COMPOUND_EXPR
1090 to assign both the address and the initial value. */
1092 gnu_expr = gnu_address;
1095 = build2 (COMPOUND_EXPR, gnu_type,
1097 (MODIFY_EXPR, NULL_TREE,
1098 build_unary_op (INDIRECT_REF, NULL_TREE,
1104 /* If it has an address clause and we are not defining it, mark it
1105 as an indirect object. Likewise for Stdcall objects that are
1107 if ((!definition && Present (Address_Clause (gnat_entity)))
1108 || (Is_Imported (gnat_entity)
1109 && Has_Stdcall_Convention (gnat_entity)))
1111 /* Convert the type of the object to a reference type that can
1112 alias everything as per 13.3(19). */
1114 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1115 gnu_size = NULL_TREE;
1117 /* No point in taking the address of an initializing expression
1118 that isn't going to be used. */
1119 gnu_expr = NULL_TREE;
1121 /* If it has an address clause whose value is known at compile
1122 time, make the object a CONST_DECL. This will avoid a
1123 useless dereference. */
1124 if (Present (Address_Clause (gnat_entity)))
1126 Node_Id gnat_address
1127 = Expression (Address_Clause (gnat_entity));
1129 if (compile_time_known_address_p (gnat_address))
1131 gnu_expr = gnat_to_gnu (gnat_address);
1139 /* If we are at top level and this object is of variable size,
1140 make the actual type a hidden pointer to the real type and
1141 make the initializer be a memory allocation and initialization.
1142 Likewise for objects we aren't defining (presumed to be
1143 external references from other packages), but there we do
1144 not set up an initialization.
1146 If the object's size overflows, make an allocator too, so that
1147 Storage_Error gets raised. Note that we will never free
1148 such memory, so we presume it never will get allocated. */
1150 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1151 global_bindings_p () || !definition
1154 && ! allocatable_size_p (gnu_size,
1155 global_bindings_p () || !definition
1158 gnu_type = build_reference_type (gnu_type);
1159 gnu_size = NULL_TREE;
1163 /* In case this was a aliased object whose nominal subtype is
1164 unconstrained, the pointer above will be a thin pointer and
1165 build_allocator will automatically make the template.
1167 If we have a template initializer only (that we made above),
1168 pretend there is none and rely on what build_allocator creates
1169 again anyway. Otherwise (if we have a full initializer), get
1170 the data part and feed that to build_allocator.
1172 If we are elaborating a mutable object, tell build_allocator to
1173 ignore a possibly simpler size from the initializer, if any, as
1174 we must allocate the maximum possible size in this case. */
1178 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1180 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1181 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1184 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1186 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1187 && 1 == VEC_length (constructor_elt,
1188 CONSTRUCTOR_ELTS (gnu_expr)))
1192 = build_component_ref
1193 (gnu_expr, NULL_TREE,
1194 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1198 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1199 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1200 && !Is_Imported (gnat_entity))
1201 post_error ("?Storage_Error will be raised at run-time!",
1204 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1205 0, 0, gnat_entity, mutable_p);
1209 gnu_expr = NULL_TREE;
1214 /* If this object would go into the stack and has an alignment larger
1215 than the largest stack alignment the back-end can honor, resort to
1216 a variable of "aligning type". */
1217 if (!global_bindings_p () && !static_p && definition
1218 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1220 /* Create the new variable. No need for extra room before the
1221 aligned field as this is in automatic storage. */
1223 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1224 TYPE_SIZE_UNIT (gnu_type),
1225 BIGGEST_ALIGNMENT, 0);
1227 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1228 NULL_TREE, gnu_new_type, NULL_TREE, false,
1229 false, false, false, NULL, gnat_entity);
1231 /* Initialize the aligned field if we have an initializer. */
1234 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1236 (gnu_new_var, NULL_TREE,
1237 TYPE_FIELDS (gnu_new_type), false),
1241 /* And setup this entity as a reference to the aligned field. */
1242 gnu_type = build_reference_type (gnu_type);
1245 (ADDR_EXPR, gnu_type,
1246 build_component_ref (gnu_new_var, NULL_TREE,
1247 TYPE_FIELDS (gnu_new_type), false));
1249 gnu_size = NULL_TREE;
1255 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1256 | TYPE_QUAL_CONST));
1258 /* Convert the expression to the type of the object except in the
1259 case where the object's type is unconstrained or the object's type
1260 is a padded record whose field is of self-referential size. In
1261 the former case, converting will generate unnecessary evaluations
1262 of the CONSTRUCTOR to compute the size and in the latter case, we
1263 want to only copy the actual data. */
1265 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1266 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1267 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1268 && TYPE_IS_PADDING_P (gnu_type)
1269 && (CONTAINS_PLACEHOLDER_P
1270 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1271 gnu_expr = convert (gnu_type, gnu_expr);
1273 /* If this name is external or there was a name specified, use it,
1274 unless this is a VMS exception object since this would conflict
1275 with the symbol we need to export in addition. Don't use the
1276 Interface_Name if there is an address clause (see CD30005). */
1277 if (!Is_VMS_Exception (gnat_entity)
1278 && ((Present (Interface_Name (gnat_entity))
1279 && No (Address_Clause (gnat_entity)))
1280 || (Is_Public (gnat_entity)
1281 && (!Is_Imported (gnat_entity)
1282 || Is_Exported (gnat_entity)))))
1283 gnu_ext_name = create_concat_name (gnat_entity, 0);
1285 /* If this is constant initialized to a static constant and the
1286 object has an aggregate type, force it to be statically
1287 allocated. This will avoid an initialization copy. */
1288 if (!static_p && const_flag
1289 && gnu_expr && TREE_CONSTANT (gnu_expr)
1290 && AGGREGATE_TYPE_P (gnu_type)
1291 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1292 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1293 && TYPE_IS_PADDING_P (gnu_type)
1294 && !host_integerp (TYPE_SIZE_UNIT
1295 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1298 gnu_decl = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1299 gnu_expr, const_flag,
1300 Is_Public (gnat_entity),
1301 imported_p || !definition,
1302 static_p, attr_list, gnat_entity);
1303 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1304 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1305 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1307 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1308 if (global_bindings_p ())
1310 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1311 record_global_renaming_pointer (gnu_decl);
1315 if (definition && DECL_SIZE_UNIT (gnu_decl)
1316 && get_block_jmpbuf_decl ()
1317 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1318 || (flag_stack_check == GENERIC_STACK_CHECK
1319 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1320 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1321 add_stmt_with_node (build_call_1_expr
1322 (update_setjmp_buf_decl,
1323 build_unary_op (ADDR_EXPR, NULL_TREE,
1324 get_block_jmpbuf_decl ())),
1327 /* If we are defining an Out parameter and we're not optimizing,
1328 create a fake PARM_DECL for debugging purposes and make it
1329 point to the VAR_DECL. Suppress debug info for the latter
1330 but make sure it will still live on the stack so it can be
1331 accessed from within the debugger through the PARM_DECL. */
1332 if (kind == E_Out_Parameter && definition && !optimize)
1334 tree param = create_param_decl (gnu_entity_id, gnu_type, false);
1335 gnat_pushdecl (param, gnat_entity);
1336 SET_DECL_VALUE_EXPR (param, gnu_decl);
1337 DECL_HAS_VALUE_EXPR_P (param) = 1;
1339 debug_info_p = false;
1341 DECL_IGNORED_P (param) = 1;
1342 TREE_ADDRESSABLE (gnu_decl) = 1;
1345 /* If this is a public constant or we're not optimizing and we're not
1346 making a VAR_DECL for it, make one just for export or debugger use.
1347 Likewise if the address is taken or if either the object or type is
1348 aliased. Make an external declaration for a reference, unless this
1349 is a Standard entity since there no real symbol at the object level
1351 if (TREE_CODE (gnu_decl) == CONST_DECL
1352 && (definition || Sloc (gnat_entity) > Standard_Location)
1353 && ((Is_Public (gnat_entity)
1354 && !Present (Address_Clause (gnat_entity)))
1356 || Address_Taken (gnat_entity)
1357 || Is_Aliased (gnat_entity)
1358 || Is_Aliased (Etype (gnat_entity))))
1361 = create_true_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1362 gnu_expr, true, Is_Public (gnat_entity),
1363 !definition, static_p, NULL,
1366 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1368 /* As debugging information will be generated for the variable,
1369 do not generate information for the constant. */
1370 DECL_IGNORED_P (gnu_decl) = 1;
1373 /* If this is declared in a block that contains a block with an
1374 exception handler, we must force this variable in memory to
1375 suppress an invalid optimization. */
1376 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1377 && Exception_Mechanism != Back_End_Exceptions)
1378 TREE_ADDRESSABLE (gnu_decl) = 1;
1380 gnu_type = TREE_TYPE (gnu_decl);
1382 /* Back-annotate Alignment and Esize of the object if not already
1383 known, except for when the object is actually a pointer to the
1384 real object, since alignment and size of a pointer don't have
1385 anything to do with those of the designated object. Note that
1386 we pick the values of the type, not those of the object, to
1387 shield ourselves from low-level platform-dependent adjustments
1388 like alignment promotion. This is both consistent with all the
1389 treatment above, where alignment and size are set on the type of
1390 the object and not on the object directly, and makes it possible
1391 to support confirming representation clauses in all cases. */
1393 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1394 Set_Alignment (gnat_entity,
1395 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
1397 if (!used_by_ref && Unknown_Esize (gnat_entity))
1399 if (TREE_CODE (gnu_type) == RECORD_TYPE
1400 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
1402 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
1404 Set_Esize (gnat_entity, annotate_value (gnu_object_size));
1410 /* Return a TYPE_DECL for "void" that we previously made. */
1411 gnu_decl = void_type_decl_node;
1414 case E_Enumeration_Type:
1415 /* A special case, for the types Character and Wide_Character in
1416 Standard, we do not list all the literals. So if the literals
1417 are not specified, make this an unsigned type. */
1418 if (No (First_Literal (gnat_entity)))
1420 gnu_type = make_unsigned_type (esize);
1421 TYPE_NAME (gnu_type) = gnu_entity_id;
1423 /* Set TYPE_STRING_FLAG for Ada Character and Wide_Character types.
1424 This is needed by the DWARF-2 back-end to distinguish between
1425 unsigned integer types and character types. */
1426 TYPE_STRING_FLAG (gnu_type) = 1;
1430 /* Normal case of non-character type, or non-Standard character type */
1432 /* Here we have a list of enumeral constants in First_Literal.
1433 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1434 the list to be places into TYPE_FIELDS. Each node in the list
1435 is a TREE_LIST node whose TREE_VALUE is the literal name
1436 and whose TREE_PURPOSE is the value of the literal.
1438 Esize contains the number of bits needed to represent the enumeral
1439 type, Type_Low_Bound also points to the first literal and
1440 Type_High_Bound points to the last literal. */
1442 Entity_Id gnat_literal;
1443 tree gnu_literal_list = NULL_TREE;
1445 if (Is_Unsigned_Type (gnat_entity))
1446 gnu_type = make_unsigned_type (esize);
1448 gnu_type = make_signed_type (esize);
1450 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1452 for (gnat_literal = First_Literal (gnat_entity);
1453 Present (gnat_literal);
1454 gnat_literal = Next_Literal (gnat_literal))
1456 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1459 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1460 gnu_type, gnu_value, true, false, false,
1461 false, NULL, gnat_literal);
1463 save_gnu_tree (gnat_literal, gnu_literal, false);
1464 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1465 gnu_value, gnu_literal_list);
1468 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1470 /* Note that the bounds are updated at the end of this function
1471 because to avoid an infinite recursion when we get the bounds of
1472 this type, since those bounds are objects of this type. */
1476 case E_Signed_Integer_Type:
1477 case E_Ordinary_Fixed_Point_Type:
1478 case E_Decimal_Fixed_Point_Type:
1479 /* For integer types, just make a signed type the appropriate number
1481 gnu_type = make_signed_type (esize);
1484 case E_Modular_Integer_Type:
1485 /* For modular types, make the unsigned type of the proper number of
1486 bits and then set up the modulus, if required. */
1488 enum machine_mode mode;
1492 if (Is_Packed_Array_Type (gnat_entity))
1493 esize = UI_To_Int (RM_Size (gnat_entity));
1495 /* Find the smallest mode at least ESIZE bits wide and make a class
1498 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1499 GET_MODE_BITSIZE (mode) < esize;
1500 mode = GET_MODE_WIDER_MODE (mode))
1503 gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode));
1504 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
1505 = (Is_Packed_Array_Type (gnat_entity)
1506 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
1508 /* Get the modulus in this type. If it overflows, assume it is because
1509 it is equal to 2**Esize. Note that there is no overflow checking
1510 done on unsigned type, so we detect the overflow by looking for
1511 a modulus of zero, which is otherwise invalid. */
1512 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1514 if (!integer_zerop (gnu_modulus))
1516 TYPE_MODULAR_P (gnu_type) = 1;
1517 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1518 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1519 convert (gnu_type, integer_one_node));
1522 /* If we have to set TYPE_PRECISION different from its natural value,
1523 make a subtype to do do. Likewise if there is a modulus and
1524 it is not one greater than TYPE_MAX_VALUE. */
1525 if (TYPE_PRECISION (gnu_type) != esize
1526 || (TYPE_MODULAR_P (gnu_type)
1527 && !tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high)))
1529 tree gnu_subtype = make_node (INTEGER_TYPE);
1531 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1532 TREE_TYPE (gnu_subtype) = gnu_type;
1533 TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type);
1534 TYPE_MAX_VALUE (gnu_subtype)
1535 = TYPE_MODULAR_P (gnu_type)
1536 ? gnu_high : TYPE_MAX_VALUE (gnu_type);
1537 TYPE_PRECISION (gnu_subtype) = esize;
1538 TYPE_UNSIGNED (gnu_subtype) = 1;
1539 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1540 TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype)
1541 = (Is_Packed_Array_Type (gnat_entity)
1542 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
1543 layout_type (gnu_subtype);
1545 gnu_type = gnu_subtype;
1550 case E_Signed_Integer_Subtype:
1551 case E_Enumeration_Subtype:
1552 case E_Modular_Integer_Subtype:
1553 case E_Ordinary_Fixed_Point_Subtype:
1554 case E_Decimal_Fixed_Point_Subtype:
1556 /* For integral subtypes, we make a new INTEGER_TYPE. Note
1557 that we do not want to call build_range_type since we would
1558 like each subtype node to be distinct. This will be important
1559 when memory aliasing is implemented.
1561 The TREE_TYPE field of the INTEGER_TYPE we make points to the
1562 parent type; this fact is used by the arithmetic conversion
1565 We elaborate the Ancestor_Subtype if it is not in the current
1566 unit and one of our bounds is non-static. We do this to ensure
1567 consistent naming in the case where several subtypes share the same
1568 bounds by always elaborating the first such subtype first, thus
1572 && Present (Ancestor_Subtype (gnat_entity))
1573 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1574 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1575 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1576 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1579 gnu_type = make_node (INTEGER_TYPE);
1580 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1582 /* Set the precision to the Esize except for bit-packed arrays and
1583 subtypes of Standard.Boolean. */
1584 if (Is_Packed_Array_Type (gnat_entity)
1585 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1587 esize = UI_To_Int (RM_Size (gnat_entity));
1588 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1590 else if (TREE_CODE (TREE_TYPE (gnu_type)) == BOOLEAN_TYPE)
1593 TYPE_PRECISION (gnu_type) = esize;
1595 TYPE_MIN_VALUE (gnu_type)
1596 = convert (TREE_TYPE (gnu_type),
1597 elaborate_expression (Type_Low_Bound (gnat_entity),
1599 get_identifier ("L"), definition, 1,
1600 Needs_Debug_Info (gnat_entity)));
1602 TYPE_MAX_VALUE (gnu_type)
1603 = convert (TREE_TYPE (gnu_type),
1604 elaborate_expression (Type_High_Bound (gnat_entity),
1606 get_identifier ("U"), definition, 1,
1607 Needs_Debug_Info (gnat_entity)));
1609 /* One of the above calls might have caused us to be elaborated,
1610 so don't blow up if so. */
1611 if (present_gnu_tree (gnat_entity))
1613 maybe_present = true;
1617 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1618 = Has_Biased_Representation (gnat_entity);
1620 /* This should be an unsigned type if the lower bound is constant
1621 and non-negative or if the base type is unsigned; a signed type
1623 TYPE_UNSIGNED (gnu_type)
1624 = (TYPE_UNSIGNED (TREE_TYPE (gnu_type))
1625 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
1626 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
1627 || TYPE_BIASED_REPRESENTATION_P (gnu_type)
1628 || Is_Unsigned_Type (gnat_entity));
1630 layout_type (gnu_type);
1632 /* Inherit our alias set from what we're a subtype of. Subtypes
1633 are not different types and a pointer can designate any instance
1634 within a subtype hierarchy. */
1635 copy_alias_set (gnu_type, TREE_TYPE (gnu_type));
1637 /* If the type we are dealing with is to represent a packed array,
1638 we need to have the bits left justified on big-endian targets
1639 and right justified on little-endian targets. We also need to
1640 ensure that when the value is read (e.g. for comparison of two
1641 such values), we only get the good bits, since the unused bits
1642 are uninitialized. Both goals are accomplished by wrapping the
1643 modular value in an enclosing struct. */
1644 if (Is_Packed_Array_Type (gnat_entity)
1645 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1647 tree gnu_field_type = gnu_type;
1650 TYPE_RM_SIZE_NUM (gnu_field_type)
1651 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1652 gnu_type = make_node (RECORD_TYPE);
1653 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1655 /* Propagate the alignment of the modular type to the record.
1656 This means that bitpacked arrays have "ceil" alignment for
1657 their size, which may seem counter-intuitive but makes it
1658 possible to easily overlay them on modular types. */
1659 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1660 TYPE_PACKED (gnu_type) = 1;
1662 /* Create a stripped-down declaration of the original type, mainly
1664 create_type_decl (get_entity_name (gnat_entity), gnu_field_type,
1665 NULL, true, debug_info_p, gnat_entity);
1667 /* Don't notify the field as "addressable", since we won't be taking
1668 it's address and it would prevent create_field_decl from making a
1670 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1671 gnu_field_type, gnu_type, 1, 0, 0, 0);
1673 finish_record_type (gnu_type, gnu_field, 0, false);
1674 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1675 SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize));
1677 copy_alias_set (gnu_type, gnu_field_type);
1680 /* If the type we are dealing with has got a smaller alignment than the
1681 natural one, we need to wrap it up in a record type and under-align
1682 the latter. We reuse the padding machinery for this purpose. */
1683 else if (Known_Alignment (gnat_entity)
1684 && UI_Is_In_Int_Range (Alignment (gnat_entity))
1685 && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
1686 && align < TYPE_ALIGN (gnu_type))
1688 tree gnu_field_type = gnu_type;
1691 gnu_type = make_node (RECORD_TYPE);
1692 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1694 TYPE_ALIGN (gnu_type) = align;
1695 TYPE_PACKED (gnu_type) = 1;
1697 /* Create a stripped-down declaration of the original type, mainly
1699 create_type_decl (get_entity_name (gnat_entity), gnu_field_type,
1700 NULL, true, debug_info_p, gnat_entity);
1702 /* Don't notify the field as "addressable", since we won't be taking
1703 it's address and it would prevent create_field_decl from making a
1705 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1706 gnu_field_type, gnu_type, 1, 0, 0, 0);
1708 finish_record_type (gnu_type, gnu_field, 0, false);
1709 TYPE_IS_PADDING_P (gnu_type) = 1;
1710 SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize));
1712 copy_alias_set (gnu_type, gnu_field_type);
1715 /* Otherwise reset the alignment lest we computed it above. */
1721 case E_Floating_Point_Type:
1722 /* If this is a VAX floating-point type, use an integer of the proper
1723 size. All the operations will be handled with ASM statements. */
1724 if (Vax_Float (gnat_entity))
1726 gnu_type = make_signed_type (esize);
1727 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1728 SET_TYPE_DIGITS_VALUE (gnu_type,
1729 UI_To_gnu (Digits_Value (gnat_entity),
1734 /* The type of the Low and High bounds can be our type if this is
1735 a type from Standard, so set them at the end of the function. */
1736 gnu_type = make_node (REAL_TYPE);
1737 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1738 layout_type (gnu_type);
1741 case E_Floating_Point_Subtype:
1742 if (Vax_Float (gnat_entity))
1744 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1750 && Present (Ancestor_Subtype (gnat_entity))
1751 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1752 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1753 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1754 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1757 gnu_type = make_node (REAL_TYPE);
1758 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1759 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1761 TYPE_MIN_VALUE (gnu_type)
1762 = convert (TREE_TYPE (gnu_type),
1763 elaborate_expression (Type_Low_Bound (gnat_entity),
1764 gnat_entity, get_identifier ("L"),
1766 Needs_Debug_Info (gnat_entity)));
1768 TYPE_MAX_VALUE (gnu_type)
1769 = convert (TREE_TYPE (gnu_type),
1770 elaborate_expression (Type_High_Bound (gnat_entity),
1771 gnat_entity, get_identifier ("U"),
1773 Needs_Debug_Info (gnat_entity)));
1775 /* One of the above calls might have caused us to be elaborated,
1776 so don't blow up if so. */
1777 if (present_gnu_tree (gnat_entity))
1779 maybe_present = true;
1783 layout_type (gnu_type);
1785 /* Inherit our alias set from what we're a subtype of, as for
1786 integer subtypes. */
1787 copy_alias_set (gnu_type, TREE_TYPE (gnu_type));
1791 /* Array and String Types and Subtypes
1793 Unconstrained array types are represented by E_Array_Type and
1794 constrained array types are represented by E_Array_Subtype. There
1795 are no actual objects of an unconstrained array type; all we have
1796 are pointers to that type.
1798 The following fields are defined on array types and subtypes:
1800 Component_Type Component type of the array.
1801 Number_Dimensions Number of dimensions (an int).
1802 First_Index Type of first index. */
1807 tree gnu_template_fields = NULL_TREE;
1808 tree gnu_template_type = make_node (RECORD_TYPE);
1809 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1810 tree gnu_fat_type = make_node (RECORD_TYPE);
1811 int ndim = Number_Dimensions (gnat_entity);
1813 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1815 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1817 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
1818 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
1819 tree gnu_comp_size = 0;
1820 tree gnu_max_size = size_one_node;
1821 tree gnu_max_size_unit;
1822 Entity_Id gnat_ind_subtype;
1823 Entity_Id gnat_ind_base_subtype;
1824 tree gnu_template_reference;
1827 TYPE_NAME (gnu_template_type)
1828 = create_concat_name (gnat_entity, "XUB");
1830 /* Make a node for the array. If we are not defining the array
1831 suppress expanding incomplete types. */
1832 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1835 defer_incomplete_level++, this_deferred = true;
1837 /* Build the fat pointer type. Use a "void *" object instead of
1838 a pointer to the array type since we don't have the array type
1839 yet (it will reference the fat pointer via the bounds). */
1840 tem = chainon (chainon (NULL_TREE,
1841 create_field_decl (get_identifier ("P_ARRAY"),
1843 gnu_fat_type, 0, 0, 0, 0)),
1844 create_field_decl (get_identifier ("P_BOUNDS"),
1846 gnu_fat_type, 0, 0, 0, 0));
1848 /* Make sure we can put this into a register. */
1849 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1851 /* Do not finalize this record type since the types of its fields
1852 are still incomplete at this point. */
1853 finish_record_type (gnu_fat_type, tem, 0, true);
1854 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1856 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1857 is the fat pointer. This will be used to access the individual
1858 fields once we build them. */
1859 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1860 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1861 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1862 gnu_template_reference
1863 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1864 TREE_READONLY (gnu_template_reference) = 1;
1866 /* Now create the GCC type for each index and add the fields for
1867 that index to the template. */
1868 for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
1869 gnat_ind_base_subtype
1870 = First_Index (Implementation_Base_Type (gnat_entity));
1871 index < ndim && index >= 0;
1873 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1874 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1876 char field_name[10];
1877 tree gnu_ind_subtype
1878 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1879 tree gnu_base_subtype
1880 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1882 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1884 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1885 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1887 /* Make the FIELD_DECLs for the minimum and maximum of this
1888 type and then make extractions of that field from the
1890 sprintf (field_name, "LB%d", index);
1891 gnu_min_field = create_field_decl (get_identifier (field_name),
1893 gnu_template_type, 0, 0, 0, 0);
1894 field_name[0] = 'U';
1895 gnu_max_field = create_field_decl (get_identifier (field_name),
1897 gnu_template_type, 0, 0, 0, 0);
1899 Sloc_to_locus (Sloc (gnat_entity),
1900 &DECL_SOURCE_LOCATION (gnu_min_field));
1901 Sloc_to_locus (Sloc (gnat_entity),
1902 &DECL_SOURCE_LOCATION (gnu_max_field));
1903 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1905 /* We can't use build_component_ref here since the template
1906 type isn't complete yet. */
1907 gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype,
1908 gnu_template_reference, gnu_min_field,
1910 gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype,
1911 gnu_template_reference, gnu_max_field,
1913 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1915 /* Make a range type with the new ranges, but using
1916 the Ada subtype. Then we convert to sizetype. */
1917 gnu_index_types[index]
1918 = create_index_type (convert (sizetype, gnu_min),
1919 convert (sizetype, gnu_max),
1920 build_range_type (gnu_ind_subtype,
1923 /* Update the maximum size of the array, in elements. */
1925 = size_binop (MULT_EXPR, gnu_max_size,
1926 size_binop (PLUS_EXPR, size_one_node,
1927 size_binop (MINUS_EXPR, gnu_base_max,
1930 TYPE_NAME (gnu_index_types[index])
1931 = create_concat_name (gnat_entity, field_name);
1934 for (index = 0; index < ndim; index++)
1936 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1938 /* Install all the fields into the template. */
1939 finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
1940 TYPE_READONLY (gnu_template_type) = 1;
1942 /* Now make the array of arrays and update the pointer to the array
1943 in the fat pointer. Note that it is the first field. */
1944 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1946 /* Try to get a smaller form of the component if needed. */
1947 if ((Is_Packed (gnat_entity)
1948 || Has_Component_Size_Clause (gnat_entity))
1949 && !Is_Bit_Packed_Array (gnat_entity)
1950 && !Has_Aliased_Components (gnat_entity)
1951 && !Strict_Alignment (Component_Type (gnat_entity))
1952 && TREE_CODE (tem) == RECORD_TYPE
1953 && host_integerp (TYPE_SIZE (tem), 1))
1954 tem = make_packable_type (tem, false);
1956 if (Has_Atomic_Components (gnat_entity))
1957 check_ok_for_atomic (tem, gnat_entity, true);
1959 /* Get and validate any specified Component_Size, but if Packed,
1960 ignore it since the front end will have taken care of it. */
1962 = validate_size (Component_Size (gnat_entity), tem,
1964 (Is_Bit_Packed_Array (gnat_entity)
1965 ? TYPE_DECL : VAR_DECL),
1966 true, Has_Component_Size_Clause (gnat_entity));
1968 /* If the component type is a RECORD_TYPE that has a self-referential
1969 size, use the maximum size. */
1970 if (!gnu_comp_size && TREE_CODE (tem) == RECORD_TYPE
1971 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1972 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1974 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
1977 tem = make_type_from_size (tem, gnu_comp_size, false);
1979 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1980 "C_PAD", false, definition, true);
1981 /* If a padding record was made, declare it now since it will
1982 never be declared otherwise. This is necessary to ensure
1983 that its subtrees are properly marked. */
1984 if (tem != orig_tem)
1985 create_type_decl (TYPE_NAME (tem), tem, NULL, true,
1986 debug_info_p, gnat_entity);
1989 if (Has_Volatile_Components (gnat_entity))
1990 tem = build_qualified_type (tem,
1991 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1993 /* If Component_Size is not already specified, annotate it with the
1994 size of the component. */
1995 if (Unknown_Component_Size (gnat_entity))
1996 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1998 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
1999 size_binop (MULT_EXPR, gnu_max_size,
2000 TYPE_SIZE_UNIT (tem)));
2001 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
2002 size_binop (MULT_EXPR,
2003 convert (bitsizetype,
2007 for (index = ndim - 1; index >= 0; index--)
2009 tem = build_array_type (tem, gnu_index_types[index]);
2010 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
2011 if (array_type_has_nonaliased_component (gnat_entity, tem))
2012 TYPE_NONALIASED_COMPONENT (tem) = 1;
2015 /* If an alignment is specified, use it if valid. But ignore it for
2016 types that represent the unpacked base type for packed arrays. If
2017 the alignment was requested with an explicit user alignment clause,
2019 if (No (Packed_Array_Type (gnat_entity))
2020 && Known_Alignment (gnat_entity))
2022 gcc_assert (Present (Alignment (gnat_entity)));
2024 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2026 if (Present (Alignment_Clause (gnat_entity)))
2027 TYPE_USER_ALIGN (tem) = 1;
2030 TYPE_CONVENTION_FORTRAN_P (tem)
2031 = (Convention (gnat_entity) == Convention_Fortran);
2032 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2034 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2035 corresponding fat pointer. */
2036 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2037 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2038 SET_TYPE_MODE (gnu_type, BLKmode);
2039 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2040 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2042 /* If the maximum size doesn't overflow, use it. */
2043 if (TREE_CODE (gnu_max_size) == INTEGER_CST
2044 && !TREE_OVERFLOW (gnu_max_size))
2046 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
2047 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2048 && !TREE_OVERFLOW (gnu_max_size_unit))
2049 TYPE_SIZE_UNIT (tem)
2050 = size_binop (MIN_EXPR, gnu_max_size_unit,
2051 TYPE_SIZE_UNIT (tem));
2053 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2054 tem, NULL, !Comes_From_Source (gnat_entity),
2055 debug_info_p, gnat_entity);
2057 /* Give the fat pointer type a name. */
2058 create_type_decl (create_concat_name (gnat_entity, "XUP"),
2059 gnu_fat_type, NULL, !Comes_From_Source (gnat_entity),
2060 debug_info_p, gnat_entity);
2062 /* Create the type to be used as what a thin pointer designates: an
2063 record type for the object and its template with the field offsets
2064 shifted to have the template at a negative offset. */
2065 tem = build_unc_object_type (gnu_template_type, tem,
2066 create_concat_name (gnat_entity, "XUT"));
2067 shift_unc_components_for_thin_pointers (tem);
2069 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2070 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2072 /* Give the thin pointer type a name. */
2073 create_type_decl (create_concat_name (gnat_entity, "XUX"),
2074 build_pointer_type (tem), NULL,
2075 !Comes_From_Source (gnat_entity), debug_info_p,
2080 case E_String_Subtype:
2081 case E_Array_Subtype:
2083 /* This is the actual data type for array variables. Multidimensional
2084 arrays are implemented in the gnu tree as arrays of arrays. Note
2085 that for the moment arrays which have sparse enumeration subtypes as
2086 index components create sparse arrays, which is obviously space
2087 inefficient but so much easier to code for now.
2089 Also note that the subtype never refers to the unconstrained
2090 array type, which is somewhat at variance with Ada semantics.
2092 First check to see if this is simply a renaming of the array
2093 type. If so, the result is the array type. */
2095 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2096 if (!Is_Constrained (gnat_entity))
2101 int array_dim = Number_Dimensions (gnat_entity);
2103 = ((Convention (gnat_entity) == Convention_Fortran)
2104 ? array_dim - 1 : 0);
2106 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
2107 Entity_Id gnat_ind_subtype;
2108 Entity_Id gnat_ind_base_subtype;
2109 tree gnu_base_type = gnu_type;
2110 tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
2111 tree gnu_comp_size = NULL_TREE;
2112 tree gnu_max_size = size_one_node;
2113 tree gnu_max_size_unit;
2114 bool need_index_type_struct = false;
2115 bool max_overflow = false;
2117 /* First create the gnu types for each index. Create types for
2118 debugging information to point to the index types if the
2119 are not integer types, have variable bounds, or are
2120 wider than sizetype. */
2122 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
2123 gnat_ind_base_subtype
2124 = First_Index (Implementation_Base_Type (gnat_entity));
2125 index < array_dim && index >= 0;
2127 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
2128 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
2130 tree gnu_index_subtype
2131 = get_unpadded_type (Etype (gnat_ind_subtype));
2133 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
2135 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
2136 tree gnu_base_subtype
2137 = get_unpadded_type (Etype (gnat_ind_base_subtype));
2139 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
2141 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
2142 tree gnu_base_type = get_base_type (gnu_base_subtype);
2143 tree gnu_base_base_min
2144 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
2145 tree gnu_base_base_max
2146 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
2150 /* If the minimum and maximum values both overflow in
2151 SIZETYPE, but the difference in the original type
2152 does not overflow in SIZETYPE, ignore the overflow
2154 if ((TYPE_PRECISION (gnu_index_subtype)
2155 > TYPE_PRECISION (sizetype)
2156 || TYPE_UNSIGNED (gnu_index_subtype)
2157 != TYPE_UNSIGNED (sizetype))
2158 && TREE_CODE (gnu_min) == INTEGER_CST
2159 && TREE_CODE (gnu_max) == INTEGER_CST
2160 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2162 (fold_build2 (MINUS_EXPR, gnu_index_subtype,
2163 TYPE_MAX_VALUE (gnu_index_subtype),
2164 TYPE_MIN_VALUE (gnu_index_subtype)))))
2166 TREE_OVERFLOW (gnu_min) = 0;
2167 TREE_OVERFLOW (gnu_max) = 0;
2170 /* Similarly, if the range is null, use bounds of 1..0 for
2171 the sizetype bounds. */
2172 else if ((TYPE_PRECISION (gnu_index_subtype)
2173 > TYPE_PRECISION (sizetype)
2174 || TYPE_UNSIGNED (gnu_index_subtype)
2175 != TYPE_UNSIGNED (sizetype))
2176 && TREE_CODE (gnu_min) == INTEGER_CST
2177 && TREE_CODE (gnu_max) == INTEGER_CST
2178 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2179 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
2180 TYPE_MIN_VALUE (gnu_index_subtype)))
2181 gnu_min = size_one_node, gnu_max = size_zero_node;
2183 /* Now compute the size of this bound. We need to provide
2184 GCC with an upper bound to use but have to deal with the
2185 "superflat" case. There are three ways to do this. If we
2186 can prove that the array can never be superflat, we can
2187 just use the high bound of the index subtype. If we can
2188 prove that the low bound minus one can't overflow, we
2189 can do this as MAX (hb, lb - 1). Otherwise, we have to use
2190 the expression hb >= lb ? hb : lb - 1. */
2191 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2193 /* See if the base array type is already flat. If it is, we
2194 are probably compiling an ACVC test, but it will cause the
2195 code below to malfunction if we don't handle it specially. */
2196 if (TREE_CODE (gnu_base_min) == INTEGER_CST
2197 && TREE_CODE (gnu_base_max) == INTEGER_CST
2198 && !TREE_OVERFLOW (gnu_base_min)
2199 && !TREE_OVERFLOW (gnu_base_max)
2200 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
2201 gnu_high = size_zero_node, gnu_min = size_one_node;
2203 /* If gnu_high is now an integer which overflowed, the array
2204 cannot be superflat. */
2205 else if (TREE_CODE (gnu_high) == INTEGER_CST
2206 && TREE_OVERFLOW (gnu_high))
2208 else if (TYPE_UNSIGNED (gnu_base_subtype)
2209 || TREE_CODE (gnu_high) == INTEGER_CST)
2210 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2214 (sizetype, build_binary_op (GE_EXPR, integer_type_node,
2218 gnu_index_type[index]
2219 = create_index_type (gnu_min, gnu_high, gnu_index_subtype,
2222 /* Also compute the maximum size of the array. Here we
2223 see if any constraint on the index type of the base type
2224 can be used in the case of self-referential bound on
2225 the index type of the subtype. We look for a non-"infinite"
2226 and non-self-referential bound from any type involved and
2227 handle each bound separately. */
2229 if ((TREE_CODE (gnu_min) == INTEGER_CST
2230 && !TREE_OVERFLOW (gnu_min)
2231 && !operand_equal_p (gnu_min, gnu_base_base_min, 0))
2232 || !CONTAINS_PLACEHOLDER_P (gnu_min)
2233 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2234 && !TREE_OVERFLOW (gnu_base_min)))
2235 gnu_base_min = gnu_min;
2237 if ((TREE_CODE (gnu_max) == INTEGER_CST
2238 && !TREE_OVERFLOW (gnu_max)
2239 && !operand_equal_p (gnu_max, gnu_base_base_max, 0))
2240 || !CONTAINS_PLACEHOLDER_P (gnu_max)
2241 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2242 && !TREE_OVERFLOW (gnu_base_max)))
2243 gnu_base_max = gnu_max;
2245 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2246 && TREE_OVERFLOW (gnu_base_min))
2247 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2248 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2249 && TREE_OVERFLOW (gnu_base_max))
2250 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2251 max_overflow = true;
2253 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
2254 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
2257 = size_binop (MAX_EXPR,
2258 size_binop (PLUS_EXPR, size_one_node,
2259 size_binop (MINUS_EXPR, gnu_base_max,
2263 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2264 && TREE_OVERFLOW (gnu_this_max))
2265 max_overflow = true;
2268 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2270 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
2271 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
2273 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
2274 || (TREE_TYPE (gnu_index_subtype)
2275 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
2277 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
2278 || (TYPE_PRECISION (gnu_index_subtype)
2279 > TYPE_PRECISION (sizetype)))
2280 need_index_type_struct = true;
2283 /* Then flatten: create the array of arrays. For an array type
2284 used to implement a packed array, get the component type from
2285 the original array type since the representation clauses that
2286 can affect it are on the latter. */
2287 if (Is_Packed_Array_Type (gnat_entity)
2288 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2290 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2291 for (index = array_dim - 1; index >= 0; index--)
2292 gnu_type = TREE_TYPE (gnu_type);
2294 /* One of the above calls might have caused us to be elaborated,
2295 so don't blow up if so. */
2296 if (present_gnu_tree (gnat_entity))
2298 maybe_present = true;
2304 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
2306 /* One of the above calls might have caused us to be elaborated,
2307 so don't blow up if so. */
2308 if (present_gnu_tree (gnat_entity))
2310 maybe_present = true;
2314 /* Try to get a smaller form of the component if needed. */
2315 if ((Is_Packed (gnat_entity)
2316 || Has_Component_Size_Clause (gnat_entity))
2317 && !Is_Bit_Packed_Array (gnat_entity)
2318 && !Has_Aliased_Components (gnat_entity)
2319 && !Strict_Alignment (Component_Type (gnat_entity))
2320 && TREE_CODE (gnu_type) == RECORD_TYPE
2321 && host_integerp (TYPE_SIZE (gnu_type), 1))
2322 gnu_type = make_packable_type (gnu_type, false);
2324 /* Get and validate any specified Component_Size, but if Packed,
2325 ignore it since the front end will have taken care of it. */
2327 = validate_size (Component_Size (gnat_entity), gnu_type,
2329 (Is_Bit_Packed_Array (gnat_entity)
2330 ? TYPE_DECL : VAR_DECL), true,
2331 Has_Component_Size_Clause (gnat_entity));
2333 /* If the component type is a RECORD_TYPE that has a
2334 self-referential size, use the maximum size. */
2336 && TREE_CODE (gnu_type) == RECORD_TYPE
2337 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2338 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
2340 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
2344 = make_type_from_size (gnu_type, gnu_comp_size, false);
2345 orig_gnu_type = gnu_type;
2346 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
2347 gnat_entity, "C_PAD", false,
2349 /* If a padding record was made, declare it now since it
2350 will never be declared otherwise. This is necessary
2351 to ensure that its subtrees are properly marked. */
2352 if (gnu_type != orig_gnu_type)
2353 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL,
2354 true, debug_info_p, gnat_entity);
2357 if (Has_Volatile_Components (Base_Type (gnat_entity)))
2358 gnu_type = build_qualified_type (gnu_type,
2359 (TYPE_QUALS (gnu_type)
2360 | TYPE_QUAL_VOLATILE));
2363 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2364 TYPE_SIZE_UNIT (gnu_type));
2365 gnu_max_size = size_binop (MULT_EXPR,
2366 convert (bitsizetype, gnu_max_size),
2367 TYPE_SIZE (gnu_type));
2369 for (index = array_dim - 1; index >= 0; index --)
2371 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
2372 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2373 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2374 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2377 /* If we are at file level and this is a multi-dimensional array, we
2378 need to make a variable corresponding to the stride of the
2379 inner dimensions. */
2380 if (global_bindings_p () && array_dim > 1)
2382 tree gnu_str_name = get_identifier ("ST");
2385 for (gnu_arr_type = TREE_TYPE (gnu_type);
2386 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2387 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2388 gnu_str_name = concat_id_with_name (gnu_str_name, "ST"))
2390 tree eltype = TREE_TYPE (gnu_arr_type);
2392 TYPE_SIZE (gnu_arr_type)
2393 = elaborate_expression_1 (gnat_entity, gnat_entity,
2394 TYPE_SIZE (gnu_arr_type),
2395 gnu_str_name, definition, 0);
2397 /* ??? For now, store the size as a multiple of the
2398 alignment of the element type in bytes so that we
2399 can see the alignment from the tree. */
2400 TYPE_SIZE_UNIT (gnu_arr_type)
2402 (MULT_EXPR, sizetype,
2403 elaborate_expression_1
2404 (gnat_entity, gnat_entity,
2405 build_binary_op (EXACT_DIV_EXPR, sizetype,
2406 TYPE_SIZE_UNIT (gnu_arr_type),
2407 size_int (TYPE_ALIGN (eltype)
2409 concat_id_with_name (gnu_str_name, "A_U"),
2411 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2413 /* ??? create_type_decl is not invoked on the inner types so
2414 the MULT_EXPR node built above will never be marked. */
2415 mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type));
2419 /* If we need to write out a record type giving the names of
2420 the bounds, do it now. */
2421 if (need_index_type_struct && debug_info_p)
2423 tree gnu_bound_rec_type = make_node (RECORD_TYPE);
2424 tree gnu_field_list = NULL_TREE;
2427 TYPE_NAME (gnu_bound_rec_type)
2428 = create_concat_name (gnat_entity, "XA");
2430 for (index = array_dim - 1; index >= 0; index--)
2433 = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type[index]));
2435 if (TREE_CODE (gnu_type_name) == TYPE_DECL)
2436 gnu_type_name = DECL_NAME (gnu_type_name);
2438 gnu_field = create_field_decl (gnu_type_name,
2441 0, NULL_TREE, NULL_TREE, 0);
2442 TREE_CHAIN (gnu_field) = gnu_field_list;
2443 gnu_field_list = gnu_field;
2446 finish_record_type (gnu_bound_rec_type, gnu_field_list,
2449 TYPE_STUB_DECL (gnu_type)
2450 = build_decl (TYPE_DECL, NULL_TREE, gnu_type);
2453 (TYPE_STUB_DECL (gnu_type), gnu_bound_rec_type);
2456 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2457 = (Convention (gnat_entity) == Convention_Fortran);
2458 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2459 = (Is_Packed_Array_Type (gnat_entity)
2460 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2462 /* If our size depends on a placeholder and the maximum size doesn't
2463 overflow, use it. */
2464 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2465 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2466 && TREE_OVERFLOW (gnu_max_size))
2467 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2468 && TREE_OVERFLOW (gnu_max_size_unit))
2471 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2472 TYPE_SIZE (gnu_type));
2473 TYPE_SIZE_UNIT (gnu_type)
2474 = size_binop (MIN_EXPR, gnu_max_size_unit,
2475 TYPE_SIZE_UNIT (gnu_type));
2478 /* Set our alias set to that of our base type. This gives all
2479 array subtypes the same alias set. */
2480 copy_alias_set (gnu_type, gnu_base_type);
2483 /* If this is a packed type, make this type the same as the packed
2484 array type, but do some adjusting in the type first. */
2486 if (Present (Packed_Array_Type (gnat_entity)))
2488 Entity_Id gnat_index;
2489 tree gnu_inner_type;
2491 /* First finish the type we had been making so that we output
2492 debugging information for it */
2494 = build_qualified_type (gnu_type,
2495 (TYPE_QUALS (gnu_type)
2496 | (TYPE_QUAL_VOLATILE
2497 * Treat_As_Volatile (gnat_entity))));
2498 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2499 !Comes_From_Source (gnat_entity),
2500 debug_info_p, gnat_entity);
2501 if (!Comes_From_Source (gnat_entity))
2502 DECL_ARTIFICIAL (gnu_decl) = 1;
2504 /* Save it as our equivalent in case the call below elaborates
2506 save_gnu_tree (gnat_entity, gnu_decl, false);
2508 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2510 this_made_decl = true;
2511 gnu_type = TREE_TYPE (gnu_decl);
2512 save_gnu_tree (gnat_entity, NULL_TREE, false);
2514 gnu_inner_type = gnu_type;
2515 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2516 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2517 || TYPE_IS_PADDING_P (gnu_inner_type)))
2518 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2520 /* We need to point the type we just made to our index type so
2521 the actual bounds can be put into a template. */
2523 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2524 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2525 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2526 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2528 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2530 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2531 If it is, we need to make another type. */
2532 if (TYPE_MODULAR_P (gnu_inner_type))
2536 gnu_subtype = make_node (INTEGER_TYPE);
2538 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2539 TYPE_MIN_VALUE (gnu_subtype)
2540 = TYPE_MIN_VALUE (gnu_inner_type);
2541 TYPE_MAX_VALUE (gnu_subtype)
2542 = TYPE_MAX_VALUE (gnu_inner_type);
2543 TYPE_PRECISION (gnu_subtype)
2544 = TYPE_PRECISION (gnu_inner_type);
2545 TYPE_UNSIGNED (gnu_subtype)
2546 = TYPE_UNSIGNED (gnu_inner_type);
2547 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2548 layout_type (gnu_subtype);
2550 gnu_inner_type = gnu_subtype;
2553 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2556 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2558 for (gnat_index = First_Index (gnat_entity);
2559 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2560 SET_TYPE_ACTUAL_BOUNDS
2562 tree_cons (NULL_TREE,
2563 get_unpadded_type (Etype (gnat_index)),
2564 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2566 if (Convention (gnat_entity) != Convention_Fortran)
2567 SET_TYPE_ACTUAL_BOUNDS
2569 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2571 if (TREE_CODE (gnu_type) == RECORD_TYPE
2572 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2573 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2577 /* Abort if packed array with no packed array type field set. */
2579 gcc_assert (!Is_Packed (gnat_entity));
2583 case E_String_Literal_Subtype:
2584 /* Create the type for a string literal. */
2586 Entity_Id gnat_full_type
2587 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2588 && Present (Full_View (Etype (gnat_entity)))
2589 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2590 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2591 tree gnu_string_array_type
2592 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2593 tree gnu_string_index_type
2594 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2595 (TYPE_DOMAIN (gnu_string_array_type))));
2596 tree gnu_lower_bound
2597 = convert (gnu_string_index_type,
2598 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2599 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2600 tree gnu_length = ssize_int (length - 1);
2601 tree gnu_upper_bound
2602 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2604 convert (gnu_string_index_type, gnu_length));
2606 = build_range_type (gnu_string_index_type,
2607 gnu_lower_bound, gnu_upper_bound);
2609 = create_index_type (convert (sizetype,
2610 TYPE_MIN_VALUE (gnu_range_type)),
2612 TYPE_MAX_VALUE (gnu_range_type)),
2613 gnu_range_type, gnat_entity);
2616 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2618 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2619 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2620 copy_alias_set (gnu_type, gnu_string_type);
2624 /* Record Types and Subtypes
2626 The following fields are defined on record types:
2628 Has_Discriminants True if the record has discriminants
2629 First_Discriminant Points to head of list of discriminants
2630 First_Entity Points to head of list of fields
2631 Is_Tagged_Type True if the record is tagged
2633 Implementation of Ada records and discriminated records:
2635 A record type definition is transformed into the equivalent of a C
2636 struct definition. The fields that are the discriminants which are
2637 found in the Full_Type_Declaration node and the elements of the
2638 Component_List found in the Record_Type_Definition node. The
2639 Component_List can be a recursive structure since each Variant of
2640 the Variant_Part of the Component_List has a Component_List.
2642 Processing of a record type definition comprises starting the list of
2643 field declarations here from the discriminants and the calling the
2644 function components_to_record to add the rest of the fields from the
2645 component list and return the gnu type node. The function
2646 components_to_record will call itself recursively as it traverses
2650 if (Has_Complex_Representation (gnat_entity))
2653 = build_complex_type
2655 (Etype (Defining_Entity
2656 (First (Component_Items
2659 (Declaration_Node (gnat_entity)))))))));
2665 Node_Id full_definition = Declaration_Node (gnat_entity);
2666 Node_Id record_definition = Type_Definition (full_definition);
2667 Entity_Id gnat_field;
2669 tree gnu_field_list = NULL_TREE;
2670 tree gnu_get_parent;
2671 /* Set PACKED in keeping with gnat_to_gnu_field. */
2673 = Is_Packed (gnat_entity)
2675 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2677 : (Known_Alignment (gnat_entity)
2678 || (Strict_Alignment (gnat_entity)
2679 && Known_Static_Esize (gnat_entity)))
2682 bool has_rep = Has_Specified_Layout (gnat_entity);
2683 bool all_rep = has_rep;
2685 = (Is_Tagged_Type (gnat_entity)
2686 && Nkind (record_definition) == N_Derived_Type_Definition);
2688 /* See if all fields have a rep clause. Stop when we find one
2690 for (gnat_field = First_Entity (gnat_entity);
2691 Present (gnat_field) && all_rep;
2692 gnat_field = Next_Entity (gnat_field))
2693 if ((Ekind (gnat_field) == E_Component
2694 || Ekind (gnat_field) == E_Discriminant)
2695 && No (Component_Clause (gnat_field)))
2698 /* If this is a record extension, go a level further to find the
2699 record definition. Also, verify we have a Parent_Subtype. */
2702 if (!type_annotate_only
2703 || Present (Record_Extension_Part (record_definition)))
2704 record_definition = Record_Extension_Part (record_definition);
2706 gcc_assert (type_annotate_only
2707 || Present (Parent_Subtype (gnat_entity)));
2710 /* Make a node for the record. If we are not defining the record,
2711 suppress expanding incomplete types. */
2712 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2713 TYPE_NAME (gnu_type) = gnu_entity_id;
2714 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2717 defer_incomplete_level++, this_deferred = true;
2719 /* If both a size and rep clause was specified, put the size in
2720 the record type now so that it can get the proper mode. */
2721 if (has_rep && Known_Esize (gnat_entity))
2722 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2724 /* Always set the alignment here so that it can be used to
2725 set the mode, if it is making the alignment stricter. If
2726 it is invalid, it will be checked again below. If this is to
2727 be Atomic, choose a default alignment of a word unless we know
2728 the size and it's smaller. */
2729 if (Known_Alignment (gnat_entity))
2730 TYPE_ALIGN (gnu_type)
2731 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2732 else if (Is_Atomic (gnat_entity))
2733 TYPE_ALIGN (gnu_type)
2734 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2735 /* If a type needs strict alignment, the minimum size will be the
2736 type size instead of the RM size (see validate_size). Cap the
2737 alignment, lest it causes this type size to become too large. */
2738 else if (Strict_Alignment (gnat_entity)
2739 && Known_Static_Esize (gnat_entity))
2741 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2742 unsigned int raw_align = raw_size & -raw_size;
2743 if (raw_align < BIGGEST_ALIGNMENT)
2744 TYPE_ALIGN (gnu_type) = raw_align;
2747 TYPE_ALIGN (gnu_type) = 0;
2749 /* If we have a Parent_Subtype, make a field for the parent. If
2750 this record has rep clauses, force the position to zero. */
2751 if (Present (Parent_Subtype (gnat_entity)))
2753 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2756 /* A major complexity here is that the parent subtype will
2757 reference our discriminants in its Discriminant_Constraint
2758 list. But those must reference the parent component of this
2759 record which is of the parent subtype we have not built yet!
2760 To break the circle we first build a dummy COMPONENT_REF which
2761 represents the "get to the parent" operation and initialize
2762 each of those discriminants to a COMPONENT_REF of the above
2763 dummy parent referencing the corresponding discriminant of the
2764 base type of the parent subtype. */
2765 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2766 build0 (PLACEHOLDER_EXPR, gnu_type),
2767 build_decl (FIELD_DECL, NULL_TREE,
2771 if (Has_Discriminants (gnat_entity))
2772 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2773 Present (gnat_field);
2774 gnat_field = Next_Stored_Discriminant (gnat_field))
2775 if (Present (Corresponding_Discriminant (gnat_field)))
2778 build3 (COMPONENT_REF,
2779 get_unpadded_type (Etype (gnat_field)),
2781 gnat_to_gnu_field_decl (Corresponding_Discriminant
2786 /* Then we build the parent subtype. */
2787 gnu_parent = gnat_to_gnu_type (gnat_parent);
2789 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2790 initially built. The discriminants must reference the fields
2791 of the parent subtype and not those of its base type for the
2792 placeholder machinery to properly work. */
2793 if (Has_Discriminants (gnat_entity))
2794 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2795 Present (gnat_field);
2796 gnat_field = Next_Stored_Discriminant (gnat_field))
2797 if (Present (Corresponding_Discriminant (gnat_field)))
2799 Entity_Id field = Empty;
2800 for (field = First_Stored_Discriminant (gnat_parent);
2802 field = Next_Stored_Discriminant (field))
2803 if (same_discriminant_p (gnat_field, field))
2805 gcc_assert (Present (field));
2806 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2807 = gnat_to_gnu_field_decl (field);
2810 /* The "get to the parent" COMPONENT_REF must be given its
2812 TREE_TYPE (gnu_get_parent) = gnu_parent;
2814 /* ...and reference the _parent field of this record. */
2816 = create_field_decl (get_identifier
2817 (Get_Name_String (Name_uParent)),
2818 gnu_parent, gnu_type, 0,
2819 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2820 has_rep ? bitsize_zero_node : 0, 1);
2821 DECL_INTERNAL_P (gnu_field_list) = 1;
2822 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2825 /* Make the fields for the discriminants and put them into the record
2826 unless it's an Unchecked_Union. */
2827 if (Has_Discriminants (gnat_entity))
2828 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2829 Present (gnat_field);
2830 gnat_field = Next_Stored_Discriminant (gnat_field))
2832 /* If this is a record extension and this discriminant
2833 is the renaming of another discriminant, we've already
2834 handled the discriminant above. */
2835 if (Present (Parent_Subtype (gnat_entity))
2836 && Present (Corresponding_Discriminant (gnat_field)))
2840 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2842 /* Make an expression using a PLACEHOLDER_EXPR from the
2843 FIELD_DECL node just created and link that with the
2844 corresponding GNAT defining identifier. Then add to the
2846 save_gnu_tree (gnat_field,
2847 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2848 build0 (PLACEHOLDER_EXPR,
2849 DECL_CONTEXT (gnu_field)),
2850 gnu_field, NULL_TREE),
2853 if (!Is_Unchecked_Union (gnat_entity))
2855 TREE_CHAIN (gnu_field) = gnu_field_list;
2856 gnu_field_list = gnu_field;
2860 /* Put the discriminants into the record (backwards), so we can
2861 know the appropriate discriminant to use for the names of the
2863 TYPE_FIELDS (gnu_type) = gnu_field_list;
2865 /* Add the listed fields into the record and finish it up. */
2866 components_to_record (gnu_type, Component_List (record_definition),
2867 gnu_field_list, packed, definition, NULL,
2868 false, all_rep, false,
2869 Is_Unchecked_Union (gnat_entity));
2871 /* We used to remove the associations of the discriminants and
2872 _Parent for validity checking, but we may need them if there's
2873 Freeze_Node for a subtype used in this record. */
2874 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2875 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2877 /* If it is a tagged record force the type to BLKmode to insure
2878 that these objects will always be placed in memory. Do the
2879 same thing for limited record types. */
2880 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2881 SET_TYPE_MODE (gnu_type, BLKmode);
2883 /* If this is a derived type, we must make the alias set of this type
2884 the same as that of the type we are derived from. We assume here
2885 that the other type is already frozen. */
2886 if (Etype (gnat_entity) != gnat_entity
2887 && !(Is_Private_Type (Etype (gnat_entity))
2888 && Full_View (Etype (gnat_entity)) == gnat_entity))
2889 copy_alias_set (gnu_type, gnat_to_gnu_type (Etype (gnat_entity)));
2891 /* Fill in locations of fields. */
2892 annotate_rep (gnat_entity, gnu_type);
2894 /* If there are any entities in the chain corresponding to
2895 components that we did not elaborate, ensure we elaborate their
2896 types if they are Itypes. */
2897 for (gnat_temp = First_Entity (gnat_entity);
2898 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2899 if ((Ekind (gnat_temp) == E_Component
2900 || Ekind (gnat_temp) == E_Discriminant)
2901 && Is_Itype (Etype (gnat_temp))
2902 && !present_gnu_tree (gnat_temp))
2903 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2907 case E_Class_Wide_Subtype:
2908 /* If an equivalent type is present, that is what we should use.
2909 Otherwise, fall through to handle this like a record subtype
2910 since it may have constraints. */
2911 if (gnat_equiv_type != gnat_entity)
2913 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2914 maybe_present = true;
2918 /* ... fall through ... */
2920 case E_Record_Subtype:
2922 /* If Cloned_Subtype is Present it means this record subtype has
2923 identical layout to that type or subtype and we should use
2924 that GCC type for this one. The front end guarantees that
2925 the component list is shared. */
2926 if (Present (Cloned_Subtype (gnat_entity)))
2928 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2930 maybe_present = true;
2933 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2934 changing the type, make a new type with each field having the
2935 type of the field in the new subtype but having the position
2936 computed by transforming every discriminant reference according
2937 to the constraints. We don't see any difference between
2938 private and nonprivate type here since derivations from types should
2939 have been deferred until the completion of the private type. */
2942 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2947 defer_incomplete_level++, this_deferred = true;
2949 /* Get the base type initially for its alignment and sizes. But
2950 if it is a padded type, we do all the other work with the
2952 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
2954 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
2955 && TYPE_IS_PADDING_P (gnu_base_type))
2956 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
2958 gnu_type = gnu_orig_type = gnu_base_type;
2960 if (present_gnu_tree (gnat_entity))
2962 maybe_present = true;
2966 /* When the type has discriminants, and these discriminants
2967 affect the shape of what it built, factor them in.
2969 If we are making a subtype of an Unchecked_Union (must be an
2970 Itype), just return the type.
2972 We can't just use Is_Constrained because private subtypes without
2973 discriminants of full types with discriminants with default
2974 expressions are Is_Constrained but aren't constrained! */
2976 if (IN (Ekind (gnat_base_type), Record_Kind)
2977 && !Is_For_Access_Subtype (gnat_entity)
2978 && !Is_Unchecked_Union (gnat_base_type)
2979 && Is_Constrained (gnat_entity)
2980 && Stored_Constraint (gnat_entity) != No_Elist
2981 && Present (Discriminant_Constraint (gnat_entity)))
2983 Entity_Id gnat_field;
2984 tree gnu_field_list = 0;
2986 = compute_field_positions (gnu_orig_type, NULL_TREE,
2987 size_zero_node, bitsize_zero_node,
2990 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
2994 gnu_type = make_node (RECORD_TYPE);
2995 TYPE_NAME (gnu_type) = gnu_entity_id;
2996 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2998 /* Set the size, alignment and alias set of the new type to
2999 match that of the old one, doing required substitutions.
3000 We do it this early because we need the size of the new
3001 type below to discard old fields if necessary. */
3002 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
3003 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
3004 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
3005 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
3006 copy_alias_set (gnu_type, gnu_base_type);
3008 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3009 for (gnu_temp = gnu_subst_list;
3010 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3011 TYPE_SIZE (gnu_type)
3012 = substitute_in_expr (TYPE_SIZE (gnu_type),
3013 TREE_PURPOSE (gnu_temp),
3014 TREE_VALUE (gnu_temp));
3016 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
3017 for (gnu_temp = gnu_subst_list;
3018 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3019 TYPE_SIZE_UNIT (gnu_type)
3020 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
3021 TREE_PURPOSE (gnu_temp),
3022 TREE_VALUE (gnu_temp));
3024 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
3025 for (gnu_temp = gnu_subst_list;
3026 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3028 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3029 TREE_PURPOSE (gnu_temp),
3030 TREE_VALUE (gnu_temp)));
3032 for (gnat_field = First_Entity (gnat_entity);
3033 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3034 if ((Ekind (gnat_field) == E_Component
3035 || Ekind (gnat_field) == E_Discriminant)
3036 && (Underlying_Type (Scope (Original_Record_Component
3039 && (No (Corresponding_Discriminant (gnat_field))
3040 || !Is_Tagged_Type (gnat_base_type)))
3043 = gnat_to_gnu_field_decl (Original_Record_Component
3046 = TREE_VALUE (purpose_member (gnu_old_field,
3048 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3049 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3051 = gnat_to_gnu_type (Etype (gnat_field));
3052 tree gnu_size = TYPE_SIZE (gnu_field_type);
3053 tree gnu_new_pos = NULL_TREE;
3054 unsigned int offset_align
3055 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
3059 /* If there was a component clause, the field types must be
3060 the same for the type and subtype, so copy the data from
3061 the old field to avoid recomputation here. Also if the
3062 field is justified modular and the optimization in
3063 gnat_to_gnu_field was applied. */
3064 if (Present (Component_Clause
3065 (Original_Record_Component (gnat_field)))
3066 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3067 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3068 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3069 == TREE_TYPE (gnu_old_field)))
3071 gnu_size = DECL_SIZE (gnu_old_field);
3072 gnu_field_type = TREE_TYPE (gnu_old_field);
3075 /* If the old field was packed and of constant size, we
3076 have to get the old size here, as it might differ from
3077 what the Etype conveys and the latter might overlap
3078 onto the following field. Try to arrange the type for
3079 possible better packing along the way. */
3080 else if (DECL_PACKED (gnu_old_field)
3081 && TREE_CODE (DECL_SIZE (gnu_old_field))
3084 gnu_size = DECL_SIZE (gnu_old_field);
3085 if (TYPE_MODE (gnu_field_type) == BLKmode
3086 && TREE_CODE (gnu_field_type) == RECORD_TYPE
3087 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3089 = make_packable_type (gnu_field_type, true);
3092 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3093 for (gnu_temp = gnu_subst_list;
3094 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3095 gnu_pos = substitute_in_expr (gnu_pos,
3096 TREE_PURPOSE (gnu_temp),
3097 TREE_VALUE (gnu_temp));
3099 /* If the position is now a constant, we can set it as the
3100 position of the field when we make it. Otherwise, we need
3101 to deal with it specially below. */
3102 if (TREE_CONSTANT (gnu_pos))
3104 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3106 /* Discard old fields that are outside the new type.
3107 This avoids confusing code scanning it to decide
3108 how to pass it to functions on some platforms. */
3109 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3110 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3111 && !integer_zerop (gnu_size)
3112 && !tree_int_cst_lt (gnu_new_pos,
3113 TYPE_SIZE (gnu_type)))
3119 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3120 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3121 !DECL_NONADDRESSABLE_P (gnu_old_field));
3123 if (!TREE_CONSTANT (gnu_pos))
3125 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3126 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3127 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3128 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3129 DECL_SIZE (gnu_field) = gnu_size;
3130 DECL_SIZE_UNIT (gnu_field)
3131 = convert (sizetype,
3132 size_binop (CEIL_DIV_EXPR, gnu_size,
3133 bitsize_unit_node));
3134 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3137 DECL_INTERNAL_P (gnu_field)
3138 = DECL_INTERNAL_P (gnu_old_field);
3139 SET_DECL_ORIGINAL_FIELD
3140 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3141 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3143 DECL_DISCRIMINANT_NUMBER (gnu_field)
3144 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3145 TREE_THIS_VOLATILE (gnu_field)
3146 = TREE_THIS_VOLATILE (gnu_old_field);
3148 /* To match the layout crafted in components_to_record, if
3149 this is the _Tag field, put it before any discriminants
3150 instead of after them as for all other fields. */
3151 if (Chars (gnat_field) == Name_uTag)
3152 gnu_field_list = chainon (gnu_field_list, gnu_field);
3155 TREE_CHAIN (gnu_field) = gnu_field_list;
3156 gnu_field_list = gnu_field;
3159 save_gnu_tree (gnat_field, gnu_field, false);
3162 /* Now go through the entities again looking for Itypes that
3163 we have not elaborated but should (e.g., Etypes of fields
3164 that have Original_Components). */
3165 for (gnat_field = First_Entity (gnat_entity);
3166 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3167 if ((Ekind (gnat_field) == E_Discriminant
3168 || Ekind (gnat_field) == E_Component)
3169 && !present_gnu_tree (Etype (gnat_field)))
3170 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3172 /* Do not finalize it since we're going to modify it below. */
3173 gnu_field_list = nreverse (gnu_field_list);
3174 finish_record_type (gnu_type, gnu_field_list, 2, true);
3176 /* Finalize size and mode. */
3177 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3178 TYPE_SIZE_UNIT (gnu_type)
3179 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3181 compute_record_mode (gnu_type);
3183 /* Fill in locations of fields. */
3184 annotate_rep (gnat_entity, gnu_type);
3186 /* We've built a new type, make an XVS type to show what this
3187 is a subtype of. Some debuggers require the XVS type to be
3188 output first, so do it in that order. */
3191 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3192 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
3194 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
3195 gnu_orig_name = DECL_NAME (gnu_orig_name);
3197 TYPE_NAME (gnu_subtype_marker)
3198 = create_concat_name (gnat_entity, "XVS");
3199 finish_record_type (gnu_subtype_marker,
3200 create_field_decl (gnu_orig_name,
3207 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3208 gnu_subtype_marker);
3211 /* Now we can finalize it. */
3212 rest_of_record_type_compilation (gnu_type);
3215 /* Otherwise, go down all the components in the new type and
3216 make them equivalent to those in the base type. */
3218 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3219 gnat_temp = Next_Entity (gnat_temp))
3220 if ((Ekind (gnat_temp) == E_Discriminant
3221 && !Is_Unchecked_Union (gnat_base_type))
3222 || Ekind (gnat_temp) == E_Component)
3223 save_gnu_tree (gnat_temp,
3224 gnat_to_gnu_field_decl
3225 (Original_Record_Component (gnat_temp)), false);
3229 case E_Access_Subprogram_Type:
3230 /* Use the special descriptor type for dispatch tables if needed,
3231 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3232 Note that we are only required to do so for static tables in
3233 order to be compatible with the C++ ABI, but Ada 2005 allows
3234 to extend library level tagged types at the local level so
3235 we do it in the non-static case as well. */
3236 if (TARGET_VTABLE_USES_DESCRIPTORS
3237 && Is_Dispatch_Table_Entity (gnat_entity))
3239 gnu_type = fdesc_type_node;
3240 gnu_size = TYPE_SIZE (gnu_type);
3244 /* ... fall through ... */
3246 case E_Anonymous_Access_Subprogram_Type:
3247 /* If we are not defining this entity, and we have incomplete
3248 entities being processed above us, make a dummy type and
3249 fill it in later. */
3250 if (!definition && defer_incomplete_level != 0)
3252 struct incomplete *p
3253 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3256 = build_pointer_type
3257 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3258 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3259 !Comes_From_Source (gnat_entity),
3260 debug_info_p, gnat_entity);
3261 this_made_decl = true;
3262 gnu_type = TREE_TYPE (gnu_decl);
3263 save_gnu_tree (gnat_entity, gnu_decl, false);
3266 p->old_type = TREE_TYPE (gnu_type);
3267 p->full_type = Directly_Designated_Type (gnat_entity);
3268 p->next = defer_incomplete_list;
3269 defer_incomplete_list = p;
3273 /* ... fall through ... */
3275 case E_Allocator_Type:
3277 case E_Access_Attribute_Type:
3278 case E_Anonymous_Access_Type:
3279 case E_General_Access_Type:
3281 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3282 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3283 bool is_from_limited_with
3284 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3285 && From_With_Type (gnat_desig_equiv));
3287 /* Get the "full view" of this entity. If this is an incomplete
3288 entity from a limited with, treat its non-limited view as the full
3289 view. Otherwise, if this is an incomplete or private type, use the
3290 full view. In the former case, we might point to a private type,
3291 in which case, we need its full view. Also, we want to look at the
3292 actual type used for the representation, so this takes a total of
3294 Entity_Id gnat_desig_full_direct_first
3295 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3296 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3297 ? Full_View (gnat_desig_equiv) : Empty));
3298 Entity_Id gnat_desig_full_direct
3299 = ((is_from_limited_with
3300 && Present (gnat_desig_full_direct_first)
3301 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3302 ? Full_View (gnat_desig_full_direct_first)
3303 : gnat_desig_full_direct_first);
3304 Entity_Id gnat_desig_full
3305 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3307 /* This the type actually used to represent the designated type,
3308 either gnat_desig_full or gnat_desig_equiv. */
3309 Entity_Id gnat_desig_rep;
3311 /* Nonzero if this is a pointer to an unconstrained array. */
3312 bool is_unconstrained_array;
3314 /* We want to know if we'll be seeing the freeze node for any
3315 incomplete type we may be pointing to. */
3317 = (Present (gnat_desig_full)
3318 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3319 : In_Extended_Main_Code_Unit (gnat_desig_type));
3321 /* Nonzero if we make a dummy type here. */
3322 bool got_fat_p = false;
3323 /* Nonzero if the dummy is a fat pointer. */
3324 bool made_dummy = false;
3325 tree gnu_desig_type = NULL_TREE;
3326 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3328 if (!targetm.valid_pointer_mode (p_mode))
3331 /* If either the designated type or its full view is an unconstrained
3332 array subtype, replace it with the type it's a subtype of. This
3333 avoids problems with multiple copies of unconstrained array types.
3334 Likewise, if the designated type is a subtype of an incomplete
3335 record type, use the parent type to avoid order of elaboration
3336 issues. This can lose some code efficiency, but there is no
3338 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3339 && ! Is_Constrained (gnat_desig_equiv))
3340 gnat_desig_equiv = Etype (gnat_desig_equiv);
3341 if (Present (gnat_desig_full)
3342 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3343 && ! Is_Constrained (gnat_desig_full))
3344 || (Ekind (gnat_desig_full) == E_Record_Subtype
3345 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3346 gnat_desig_full = Etype (gnat_desig_full);
3348 /* Now set the type that actually marks the representation of
3349 the designated type and also flag whether we have a unconstrained
3351 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3352 is_unconstrained_array
3353 = (Is_Array_Type (gnat_desig_rep)
3354 && ! Is_Constrained (gnat_desig_rep));
3356 /* If we are pointing to an incomplete type whose completion is an
3357 unconstrained array, make a fat pointer type. The two types in our
3358 fields will be pointers to dummy nodes and will be replaced in
3359 update_pointer_to. Similarly, if the type itself is a dummy type or
3360 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3361 in case we have any thin pointers to it. */
3362 if (is_unconstrained_array
3363 && (Present (gnat_desig_full)
3364 || (present_gnu_tree (gnat_desig_equiv)
3365 && TYPE_IS_DUMMY_P (TREE_TYPE
3366 (get_gnu_tree (gnat_desig_equiv))))
3367 || (No (gnat_desig_full) && ! in_main_unit
3368 && defer_incomplete_level != 0
3369 && ! present_gnu_tree (gnat_desig_equiv))
3370 || (in_main_unit && is_from_limited_with
3371 && Present (Freeze_Node (gnat_desig_rep)))))
3374 = (present_gnu_tree (gnat_desig_rep)
3375 ? TREE_TYPE (get_gnu_tree (gnat_desig_rep))
3376 : make_dummy_type (gnat_desig_rep));
3379 /* Show the dummy we get will be a fat pointer. */
3380 got_fat_p = made_dummy = true;
3382 /* If the call above got something that has a pointer, that
3383 pointer is our type. This could have happened either
3384 because the type was elaborated or because somebody
3385 else executed the code below. */
3386 gnu_type = TYPE_POINTER_TO (gnu_old);
3389 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3390 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3391 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3392 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3394 TYPE_NAME (gnu_template_type)
3395 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3397 TYPE_DUMMY_P (gnu_template_type) = 1;
3399 TYPE_NAME (gnu_array_type)
3400 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3402 TYPE_DUMMY_P (gnu_array_type) = 1;
3404 gnu_type = make_node (RECORD_TYPE);
3405 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3406 TYPE_POINTER_TO (gnu_old) = gnu_type;
3408 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3410 = chainon (chainon (NULL_TREE,
3412 (get_identifier ("P_ARRAY"),
3414 gnu_type, 0, 0, 0, 0)),
3415 create_field_decl (get_identifier ("P_BOUNDS"),
3417 gnu_type, 0, 0, 0, 0));
3419 /* Make sure we can place this into a register. */
3420 TYPE_ALIGN (gnu_type)
3421 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3422 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3424 /* Do not finalize this record type since the types of
3425 its fields are incomplete. */
3426 finish_record_type (gnu_type, fields, 0, true);
3428 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3429 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3430 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3432 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3436 /* If we already know what the full type is, use it. */
3437 else if (Present (gnat_desig_full)
3438 && present_gnu_tree (gnat_desig_full))
3439 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3441 /* Get the type of the thing we are to point to and build a pointer
3442 to it. If it is a reference to an incomplete or private type with a
3443 full view that is a record, make a dummy type node and get the
3444 actual type later when we have verified it is safe. */
3445 else if ((! in_main_unit
3446 && ! present_gnu_tree (gnat_desig_equiv)
3447 && Present (gnat_desig_full)
3448 && ! present_gnu_tree (gnat_desig_full)
3449 && Is_Record_Type (gnat_desig_full))
3450 /* Likewise if we are pointing to a record or array and we
3451 are to defer elaborating incomplete types. We do this
3452 since this access type may be the full view of some
3453 private type. Note that the unconstrained array case is
3455 || ((! in_main_unit || imported_p)
3456 && defer_incomplete_level != 0
3457 && ! present_gnu_tree (gnat_desig_equiv)
3458 && ((Is_Record_Type (gnat_desig_rep)
3459 || Is_Array_Type (gnat_desig_rep))))
3460 /* If this is a reference from a limited_with type back to our
3461 main unit and there's a Freeze_Node for it, either we have
3462 already processed the declaration and made the dummy type,
3463 in which case we just reuse the latter, or we have not yet,
3464 in which case we make the dummy type and it will be reused
3465 when the declaration is processed. In both cases, the
3466 pointer eventually created below will be automatically
3467 adjusted when the Freeze_Node is processed. Note that the
3468 unconstrained array case is handled above. */
3469 || (in_main_unit && is_from_limited_with
3470 && Present (Freeze_Node (gnat_desig_rep))))
3472 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3476 /* Otherwise handle the case of a pointer to itself. */
3477 else if (gnat_desig_equiv == gnat_entity)
3480 = build_pointer_type_for_mode (void_type_node, p_mode,
3481 No_Strict_Aliasing (gnat_entity));
3482 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3485 /* If expansion is disabled, the equivalent type of a concurrent
3486 type is absent, so build a dummy pointer type. */
3487 else if (type_annotate_only && No (gnat_desig_equiv))
3488 gnu_type = ptr_void_type_node;
3490 /* Finally, handle the straightforward case where we can just
3491 elaborate our designated type and point to it. */
3493 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3495 /* It is possible that a call to gnat_to_gnu_type above resolved our
3496 type. If so, just return it. */
3497 if (present_gnu_tree (gnat_entity))
3499 maybe_present = true;
3503 /* If we have a GCC type for the designated type, possibly modify it
3504 if we are pointing only to constant objects and then make a pointer
3505 to it. Don't do this for unconstrained arrays. */
3506 if (!gnu_type && gnu_desig_type)
3508 if (Is_Access_Constant (gnat_entity)
3509 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3512 = build_qualified_type
3514 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3516 /* Some extra processing is required if we are building a
3517 pointer to an incomplete type (in the GCC sense). We might
3518 have such a type if we just made a dummy, or directly out
3519 of the call to gnat_to_gnu_type above if we are processing
3520 an access type for a record component designating the
3521 record type itself. */
3522 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3524 /* We must ensure that the pointer to variant we make will
3525 be processed by update_pointer_to when the initial type
3526 is completed. Pretend we made a dummy and let further
3527 processing act as usual. */
3530 /* We must ensure that update_pointer_to will not retrieve
3531 the dummy variant when building a properly qualified
3532 version of the complete type. We take advantage of the
3533 fact that get_qualified_type is requiring TYPE_NAMEs to
3534 match to influence build_qualified_type and then also
3535 update_pointer_to here. */
3536 TYPE_NAME (gnu_desig_type)
3537 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3542 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3543 No_Strict_Aliasing (gnat_entity));
3546 /* If we are not defining this object and we made a dummy pointer,
3547 save our current definition, evaluate the actual type, and replace
3548 the tentative type we made with the actual one. If we are to defer
3549 actually looking up the actual type, make an entry in the
3550 deferred list. If this is from a limited with, we have to defer
3551 to the end of the current spec in two cases: first if the
3552 designated type is in the current unit and second if the access
3554 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3557 = TYPE_FAT_POINTER_P (gnu_type)
3558 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3560 if (esize == POINTER_SIZE
3561 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3563 = build_pointer_type
3564 (TYPE_OBJECT_RECORD_TYPE
3565 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3567 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3568 !Comes_From_Source (gnat_entity),
3569 debug_info_p, gnat_entity);
3570 this_made_decl = true;
3571 gnu_type = TREE_TYPE (gnu_decl);
3572 save_gnu_tree (gnat_entity, gnu_decl, false);
3575 if (defer_incomplete_level == 0
3576 && ! (is_from_limited_with
3578 || In_Extended_Main_Code_Unit (gnat_entity))))
3579 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3580 gnat_to_gnu_type (gnat_desig_equiv));
3582 /* Note that the call to gnat_to_gnu_type here might have
3583 updated gnu_old_type directly, in which case it is not a
3584 dummy type any more when we get into update_pointer_to.
3586 This may happen for instance when the designated type is a
3587 record type, because their elaboration starts with an
3588 initial node from make_dummy_type, which may yield the same
3589 node as the one we got.
3591 Besides, variants of this non-dummy type might have been
3592 created along the way. update_pointer_to is expected to
3593 properly take care of those situations. */
3596 struct incomplete *p
3597 = (struct incomplete *) xmalloc (sizeof
3598 (struct incomplete));
3599 struct incomplete **head
3600 = (is_from_limited_with
3602 || In_Extended_Main_Code_Unit (gnat_entity))
3603 ? &defer_limited_with : &defer_incomplete_list);
3605 p->old_type = gnu_old_type;
3606 p->full_type = gnat_desig_equiv;
3614 case E_Access_Protected_Subprogram_Type:
3615 case E_Anonymous_Access_Protected_Subprogram_Type:
3616 if (type_annotate_only && No (gnat_equiv_type))
3617 gnu_type = ptr_void_type_node;
3620 /* The runtime representation is the equivalent type. */
3621 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3622 maybe_present = true;
3625 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3626 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3627 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3628 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3629 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3634 case E_Access_Subtype:
3636 /* We treat this as identical to its base type; any constraint is
3637 meaningful only to the front end.
3639 The designated type must be elaborated as well, if it does
3640 not have its own freeze node. Designated (sub)types created
3641 for constrained components of records with discriminants are
3642 not frozen by the front end and thus not elaborated by gigi,
3643 because their use may appear before the base type is frozen,
3644 and because it is not clear that they are needed anywhere in
3645 Gigi. With the current model, there is no correct place where
3646 they could be elaborated. */
3648 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3649 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3650 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3651 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3652 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3654 /* If we are not defining this entity, and we have incomplete
3655 entities being processed above us, make a dummy type and
3656 elaborate it later. */
3657 if (!definition && defer_incomplete_level != 0)
3659 struct incomplete *p
3660 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3662 = build_pointer_type
3663 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3665 p->old_type = TREE_TYPE (gnu_ptr_type);
3666 p->full_type = Directly_Designated_Type (gnat_entity);
3667 p->next = defer_incomplete_list;
3668 defer_incomplete_list = p;
3670 else if (!IN (Ekind (Base_Type
3671 (Directly_Designated_Type (gnat_entity))),
3672 Incomplete_Or_Private_Kind))
3673 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3677 maybe_present = true;
3680 /* Subprogram Entities
3682 The following access functions are defined for subprograms (functions
3685 First_Formal The first formal parameter.
3686 Is_Imported Indicates that the subprogram has appeared in
3687 an INTERFACE or IMPORT pragma. For now we
3688 assume that the external language is C.
3689 Is_Exported Likewise but for an EXPORT pragma.
3690 Is_Inlined True if the subprogram is to be inlined.
3692 In addition for function subprograms we have:
3694 Etype Return type of the function.
3696 Each parameter is first checked by calling must_pass_by_ref on its
3697 type to determine if it is passed by reference. For parameters which
3698 are copied in, if they are Ada In Out or Out parameters, their return
3699 value becomes part of a record which becomes the return type of the
3700 function (C function - note that this applies only to Ada procedures
3701 so there is no Ada return type). Additional code to store back the
3702 parameters will be generated on the caller side. This transformation
3703 is done here, not in the front-end.
3705 The intended result of the transformation can be seen from the
3706 equivalent source rewritings that follow:
3708 struct temp {int a,b};
3709 procedure P (A,B: In Out ...) is temp P (int A,B)
3712 end P; return {A,B};
3719 For subprogram types we need to perform mainly the same conversions to
3720 GCC form that are needed for procedures and function declarations. The
3721 only difference is that at the end, we make a type declaration instead
3722 of a function declaration. */
3724 case E_Subprogram_Type:
3728 /* The first GCC parameter declaration (a PARM_DECL node). The
3729 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3730 actually is the head of this parameter list. */
3731 tree gnu_param_list = NULL_TREE;
3732 /* Likewise for the stub associated with an exported procedure. */
3733 tree gnu_stub_param_list = NULL_TREE;
3734 /* The type returned by a function. If the subprogram is a procedure
3735 this type should be void_type_node. */
3736 tree gnu_return_type = void_type_node;
3737 /* List of fields in return type of procedure with copy-in copy-out
3739 tree gnu_field_list = NULL_TREE;
3740 /* Non-null for subprograms containing parameters passed by copy-in
3741 copy-out (Ada In Out or Out parameters not passed by reference),
3742 in which case it is the list of nodes used to specify the values of
3743 the in out/out parameters that are returned as a record upon
3744 procedure return. The TREE_PURPOSE of an element of this list is
3745 a field of the record and the TREE_VALUE is the PARM_DECL
3746 corresponding to that field. This list will be saved in the
3747 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3748 tree gnu_return_list = NULL_TREE;
3749 /* If an import pragma asks to map this subprogram to a GCC builtin,
3750 this is the builtin DECL node. */
3751 tree gnu_builtin_decl = NULL_TREE;
3752 /* For the stub associated with an exported procedure. */
3753 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3754 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3755 Entity_Id gnat_param;
3756 bool inline_flag = Is_Inlined (gnat_entity);
3757 bool public_flag = Is_Public (gnat_entity) || imported_p;
3759 = (Is_Public (gnat_entity) && !definition) || imported_p;
3761 /* The semantics of "pure" in Ada essentially matches that of "const"
3762 in the back-end. In particular, both properties are orthogonal to
3763 the "nothrow" property if the EH circuitry is explicit in the
3764 internal representation of the back-end. If we are to completely
3765 hide the EH circuitry from it, we need to declare that calls to pure
3766 Ada subprograms that can throw have side effects since they can
3767 trigger an "abnormal" transfer of control flow; thus they can be
3768 neither "const" nor "pure" in the back-end sense. */
3770 = (Exception_Mechanism == Back_End_Exceptions
3771 && Is_Pure (gnat_entity));
3773 bool volatile_flag = No_Return (gnat_entity);
3774 bool returns_by_ref = false;
3775 bool returns_unconstrained = false;
3776 bool returns_by_target_ptr = false;
3777 bool has_copy_in_out = false;
3778 bool has_stub = false;
3781 if (kind == E_Subprogram_Type && !definition)
3782 /* A parameter may refer to this type, so defer completion
3783 of any incomplete types. */
3784 defer_incomplete_level++, this_deferred = true;
3786 /* If the subprogram has an alias, it is probably inherited, so
3787 we can use the original one. If the original "subprogram"
3788 is actually an enumeration literal, it may be the first use
3789 of its type, so we must elaborate that type now. */
3790 if (Present (Alias (gnat_entity)))
3792 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3793 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3795 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3798 /* Elaborate any Itypes in the parameters of this entity. */
3799 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3800 Present (gnat_temp);
3801 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3802 if (Is_Itype (Etype (gnat_temp)))
3803 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3808 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3809 corresponding DECL node.
3811 We still want the parameter associations to take place because the
3812 proper generation of calls depends on it (a GNAT parameter without
3813 a corresponding GCC tree has a very specific meaning), so we don't
3815 if (Convention (gnat_entity) == Convention_Intrinsic)
3816 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3818 /* ??? What if we don't find the builtin node above ? warn ? err ?
3819 In the current state we neither warn nor err, and calls will just
3820 be handled as for regular subprograms. */
3822 if (kind == E_Function || kind == E_Subprogram_Type)
3823 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3825 /* If this function returns by reference, make the actual
3826 return type of this function the pointer and mark the decl. */
3827 if (Returns_By_Ref (gnat_entity))
3829 returns_by_ref = true;
3830 gnu_return_type = build_pointer_type (gnu_return_type);
3833 /* If the Mechanism is By_Reference, ensure the return type uses
3834 the machine's by-reference mechanism, which may not the same
3835 as above (e.g., it might be by passing a fake parameter). */
3836 else if (kind == E_Function
3837 && Mechanism (gnat_entity) == By_Reference)
3839 TREE_ADDRESSABLE (gnu_return_type) = 1;
3841 /* We expect this bit to be reset by gigi shortly, so can avoid a
3842 type node copy here. This actually also prevents troubles with
3843 the generation of debug information for the function, because
3844 we might have issued such info for this type already, and would
3845 be attaching a distinct type node to the function if we made a
3849 /* If we are supposed to return an unconstrained array,
3850 actually return a fat pointer and make a note of that. Return
3851 a pointer to an unconstrained record of variable size. */
3852 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3854 gnu_return_type = TREE_TYPE (gnu_return_type);
3855 returns_unconstrained = true;
3858 /* If the type requires a transient scope, the result is allocated
3859 on the secondary stack, so the result type of the function is
3861 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3863 gnu_return_type = build_pointer_type (gnu_return_type);
3864 returns_unconstrained = true;
3867 /* If the type is a padded type and the underlying type would not
3868 be passed by reference or this function has a foreign convention,
3869 return the underlying type. */
3870 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3871 && TYPE_IS_PADDING_P (gnu_return_type)
3872 && (!default_pass_by_ref (TREE_TYPE
3873 (TYPE_FIELDS (gnu_return_type)))
3874 || Has_Foreign_Convention (gnat_entity)))
3875 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3877 /* If the return type has a non-constant size, we convert the function
3878 into a procedure and its caller will pass a pointer to an object as
3879 the first parameter when we call the function. This can happen for
3880 an unconstrained type with a maximum size or a constrained type with
3881 a size not known at compile time. */
3882 if (TYPE_SIZE_UNIT (gnu_return_type)
3883 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
3885 returns_by_target_ptr = true;
3887 = create_param_decl (get_identifier ("TARGET"),
3888 build_reference_type (gnu_return_type),
3890 gnu_return_type = void_type_node;
3893 /* If the return type has a size that overflows, we cannot have
3894 a function that returns that type. This usage doesn't make
3895 sense anyway, so give an error here. */
3896 if (TYPE_SIZE_UNIT (gnu_return_type)
3897 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3898 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3900 post_error ("cannot return type whose size overflows",
3902 gnu_return_type = copy_node (gnu_return_type);
3903 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3904 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3905 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3906 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3909 /* Look at all our parameters and get the type of
3910 each. While doing this, build a copy-out structure if
3913 /* Loop over the parameters and get their associated GCC tree.
3914 While doing this, build a copy-out structure if we need one. */
3915 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
3916 Present (gnat_param);
3917 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3919 tree gnu_param_name = get_entity_name (gnat_param);
3920 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3921 tree gnu_param, gnu_field;
3922 bool copy_in_copy_out = false;
3923 Mechanism_Type mech = Mechanism (gnat_param);
3925 /* Builtins are expanded inline and there is no real call sequence
3926 involved. So the type expected by the underlying expander is
3927 always the type of each argument "as is". */
3928 if (gnu_builtin_decl)
3930 /* Handle the first parameter of a valued procedure specially. */
3931 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3932 mech = By_Copy_Return;
3933 /* Otherwise, see if a Mechanism was supplied that forced this
3934 parameter to be passed one way or another. */
3935 else if (mech == Default
3936 || mech == By_Copy || mech == By_Reference)
3938 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
3939 mech = By_Descriptor;
3941 else if (By_Short_Descriptor_Last <= mech &&
3942 mech <= By_Short_Descriptor)
3943 mech = By_Short_Descriptor;
3947 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
3948 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
3949 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
3951 mech = By_Reference;
3957 post_error ("unsupported mechanism for&", gnat_param);
3962 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
3963 Has_Foreign_Convention (gnat_entity),
3966 /* We are returned either a PARM_DECL or a type if no parameter
3967 needs to be passed; in either case, adjust the type. */
3968 if (DECL_P (gnu_param))
3969 gnu_param_type = TREE_TYPE (gnu_param);
3972 gnu_param_type = gnu_param;
3973 gnu_param = NULL_TREE;
3978 /* If it's an exported subprogram, we build a parameter list
3979 in parallel, in case we need to emit a stub for it. */
3980 if (Is_Exported (gnat_entity))
3983 = chainon (gnu_param, gnu_stub_param_list);
3984 /* Change By_Descriptor parameter to By_Reference for
3985 the internal version of an exported subprogram. */
3986 if (mech == By_Descriptor || mech == By_Short_Descriptor)
3989 = gnat_to_gnu_param (gnat_param, By_Reference,
3995 gnu_param = copy_node (gnu_param);
3998 gnu_param_list = chainon (gnu_param, gnu_param_list);
3999 Sloc_to_locus (Sloc (gnat_param),
4000 &DECL_SOURCE_LOCATION (gnu_param));
4001 save_gnu_tree (gnat_param, gnu_param, false);
4003 /* If a parameter is a pointer, this function may modify
4004 memory through it and thus shouldn't be considered
4005 a const function. Also, the memory may be modified
4006 between two calls, so they can't be CSE'ed. The latter
4007 case also handles by-ref parameters. */
4008 if (POINTER_TYPE_P (gnu_param_type)
4009 || TYPE_FAT_POINTER_P (gnu_param_type))
4013 if (copy_in_copy_out)
4015 if (!has_copy_in_out)
4017 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4018 gnu_return_type = make_node (RECORD_TYPE);
4019 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4020 has_copy_in_out = true;
4023 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4024 gnu_return_type, 0, 0, 0, 0);
4025 Sloc_to_locus (Sloc (gnat_param),
4026 &DECL_SOURCE_LOCATION (gnu_field));
4027 TREE_CHAIN (gnu_field) = gnu_field_list;
4028 gnu_field_list = gnu_field;
4029 gnu_return_list = tree_cons (gnu_field, gnu_param,
4034 /* Do not compute record for out parameters if subprogram is
4035 stubbed since structures are incomplete for the back-end. */
4036 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4037 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4040 /* If we have a CICO list but it has only one entry, we convert
4041 this function into a function that simply returns that one
4043 if (list_length (gnu_return_list) == 1)
4044 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
4046 if (Has_Stdcall_Convention (gnat_entity))
4047 prepend_one_attribute_to
4048 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4049 get_identifier ("stdcall"), NULL_TREE,
4052 /* If we are on a target where stack realignment is needed for 'main'
4053 to honor GCC's implicit expectations (stack alignment greater than
4054 what the base ABI guarantees), ensure we do the same for foreign
4055 convention subprograms as they might be used as callbacks from code
4056 breaking such expectations. Note that this applies to task entry
4057 points in particular. */
4058 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4059 && Has_Foreign_Convention (gnat_entity))
4060 prepend_one_attribute_to
4061 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4062 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4065 /* The lists have been built in reverse. */
4066 gnu_param_list = nreverse (gnu_param_list);
4068 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4069 gnu_return_list = nreverse (gnu_return_list);
4071 if (Ekind (gnat_entity) == E_Function)
4072 Set_Mechanism (gnat_entity,
4073 (returns_by_ref || returns_unconstrained
4074 ? By_Reference : By_Copy));
4076 = create_subprog_type (gnu_return_type, gnu_param_list,
4077 gnu_return_list, returns_unconstrained,
4078 returns_by_ref, returns_by_target_ptr);
4082 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4083 gnu_return_list, returns_unconstrained,
4084 returns_by_ref, returns_by_target_ptr);
4086 /* A subprogram (something that doesn't return anything) shouldn't
4087 be considered const since there would be no reason for such a
4088 subprogram. Note that procedures with Out (or In Out) parameters
4089 have already been converted into a function with a return type. */
4090 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4094 = build_qualified_type (gnu_type,
4095 TYPE_QUALS (gnu_type)
4096 | (TYPE_QUAL_CONST * const_flag)
4097 | (TYPE_QUAL_VOLATILE * volatile_flag));
4099 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4103 = build_qualified_type (gnu_stub_type,
4104 TYPE_QUALS (gnu_stub_type)
4105 | (TYPE_QUAL_CONST * const_flag)
4106 | (TYPE_QUAL_VOLATILE * volatile_flag));
4108 /* If we have a builtin decl for that function, check the signatures
4109 compatibilities. If the signatures are compatible, use the builtin
4110 decl. If they are not, we expect the checker predicate to have
4111 posted the appropriate errors, and just continue with what we have
4113 if (gnu_builtin_decl)
4115 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4117 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4119 gnu_decl = gnu_builtin_decl;
4120 gnu_type = gnu_builtin_type;
4125 /* If there was no specified Interface_Name and the external and
4126 internal names of the subprogram are the same, only use the
4127 internal name to allow disambiguation of nested subprograms. */
4128 if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_id)
4129 gnu_ext_name = NULL_TREE;
4131 /* If we are defining the subprogram and it has an Address clause
4132 we must get the address expression from the saved GCC tree for the
4133 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4134 the address expression here since the front-end has guaranteed
4135 in that case that the elaboration has no effects. If there is
4136 an Address clause and we are not defining the object, just
4137 make it a constant. */
4138 if (Present (Address_Clause (gnat_entity)))
4140 tree gnu_address = NULL_TREE;
4144 = (present_gnu_tree (gnat_entity)
4145 ? get_gnu_tree (gnat_entity)
4146 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4148 save_gnu_tree (gnat_entity, NULL_TREE, false);
4150 /* Convert the type of the object to a reference type that can
4151 alias everything as per 13.3(19). */
4153 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4155 gnu_address = convert (gnu_type, gnu_address);
4158 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
4159 gnu_address, false, Is_Public (gnat_entity),
4160 extern_flag, false, NULL, gnat_entity);
4161 DECL_BY_REF_P (gnu_decl) = 1;
4164 else if (kind == E_Subprogram_Type)
4165 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4166 !Comes_From_Source (gnat_entity),
4167 debug_info_p, gnat_entity);
4172 gnu_stub_name = gnu_ext_name;
4173 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4174 public_flag = false;
4177 gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name,
4178 gnu_type, gnu_param_list,
4179 inline_flag, public_flag,
4180 extern_flag, attr_list,
4185 = create_subprog_decl (gnu_entity_id, gnu_stub_name,
4186 gnu_stub_type, gnu_stub_param_list,
4188 extern_flag, attr_list,
4190 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4193 /* This is unrelated to the stub built right above. */
4194 DECL_STUBBED_P (gnu_decl)
4195 = Convention (gnat_entity) == Convention_Stubbed;
4200 case E_Incomplete_Type:
4201 case E_Incomplete_Subtype:
4202 case E_Private_Type:
4203 case E_Private_Subtype:
4204 case E_Limited_Private_Type:
4205 case E_Limited_Private_Subtype:
4206 case E_Record_Type_With_Private:
4207 case E_Record_Subtype_With_Private:
4209 /* Get the "full view" of this entity. If this is an incomplete
4210 entity from a limited with, treat its non-limited view as the
4211 full view. Otherwise, use either the full view or the underlying
4212 full view, whichever is present. This is used in all the tests
4215 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4216 && From_With_Type (gnat_entity))
4217 ? Non_Limited_View (gnat_entity)
4218 : Present (Full_View (gnat_entity))
4219 ? Full_View (gnat_entity)
4220 : Underlying_Full_View (gnat_entity);
4222 /* If this is an incomplete type with no full view, it must be a Taft
4223 Amendment type, in which case we return a dummy type. Otherwise,
4224 just get the type from its Etype. */
4227 if (kind == E_Incomplete_Type)
4228 gnu_type = make_dummy_type (gnat_entity);
4231 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4233 maybe_present = true;
4238 /* If we already made a type for the full view, reuse it. */
4239 else if (present_gnu_tree (full_view))
4241 gnu_decl = get_gnu_tree (full_view);
4245 /* Otherwise, if we are not defining the type now, get the type
4246 from the full view. But always get the type from the full view
4247 for define on use types, since otherwise we won't see them! */
4248 else if (!definition
4249 || (Is_Itype (full_view)
4250 && No (Freeze_Node (gnat_entity)))
4251 || (Is_Itype (gnat_entity)
4252 && No (Freeze_Node (full_view))))
4254 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4255 maybe_present = true;
4259 /* For incomplete types, make a dummy type entry which will be
4261 gnu_type = make_dummy_type (gnat_entity);
4263 /* Save this type as the full declaration's type so we can do any
4264 needed updates when we see it. */
4265 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4266 !Comes_From_Source (gnat_entity),
4267 debug_info_p, gnat_entity);
4268 save_gnu_tree (full_view, gnu_decl, 0);
4272 /* Simple class_wide types are always viewed as their root_type
4273 by Gigi unless an Equivalent_Type is specified. */
4274 case E_Class_Wide_Type:
4275 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4276 maybe_present = true;
4280 case E_Task_Subtype:
4281 case E_Protected_Type:
4282 case E_Protected_Subtype:
4283 if (type_annotate_only && No (gnat_equiv_type))
4284 gnu_type = void_type_node;
4286 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4288 maybe_present = true;
4292 gnu_decl = create_label_decl (gnu_entity_id);
4297 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4298 we've already saved it, so we don't try to. */
4299 gnu_decl = error_mark_node;
4307 /* If we had a case where we evaluated another type and it might have
4308 defined this one, handle it here. */
4309 if (maybe_present && present_gnu_tree (gnat_entity))
4311 gnu_decl = get_gnu_tree (gnat_entity);
4315 /* If we are processing a type and there is either no decl for it or
4316 we just made one, do some common processing for the type, such as
4317 handling alignment and possible padding. */
4319 if ((!gnu_decl || this_made_decl) && IN (kind, Type_Kind))
4321 if (Is_Tagged_Type (gnat_entity)
4322 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4323 TYPE_ALIGN_OK (gnu_type) = 1;
4325 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4326 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4328 /* ??? Don't set the size for a String_Literal since it is either
4329 confirming or we don't handle it properly (if the low bound is
4331 if (!gnu_size && kind != E_String_Literal_Subtype)
4332 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4334 Has_Size_Clause (gnat_entity));
4336 /* If a size was specified, see if we can make a new type of that size
4337 by rearranging the type, for example from a fat to a thin pointer. */
4341 = make_type_from_size (gnu_type, gnu_size,
4342 Has_Biased_Representation (gnat_entity));
4344 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4345 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4349 /* If the alignment hasn't already been processed and this is
4350 not an unconstrained array, see if an alignment is specified.
4351 If not, we pick a default alignment for atomic objects. */
4352 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4354 else if (Known_Alignment (gnat_entity))
4356 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4357 TYPE_ALIGN (gnu_type));
4359 /* Warn on suspiciously large alignments. This should catch
4360 errors about the (alignment,byte)/(size,bit) discrepancy. */
4361 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4365 /* If a size was specified, take it into account. Otherwise
4366 use the RM size for records as the type size has already
4367 been adjusted to the alignment. */
4370 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4371 || TREE_CODE (gnu_type) == UNION_TYPE
4372 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4373 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4374 size = rm_size (gnu_type);
4376 size = TYPE_SIZE (gnu_type);
4378 /* Consider an alignment as suspicious if the alignment/size
4379 ratio is greater or equal to the byte/bit ratio. */
4380 if (host_integerp (size, 1)
4381 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4382 post_error_ne ("?suspiciously large alignment specified for&",
4383 Expression (Alignment_Clause (gnat_entity)),
4387 else if (Is_Atomic (gnat_entity) && !gnu_size
4388 && host_integerp (TYPE_SIZE (gnu_type), 1)
4389 && integer_pow2p (TYPE_SIZE (gnu_type)))
4390 align = MIN (BIGGEST_ALIGNMENT,
4391 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4392 else if (Is_Atomic (gnat_entity) && gnu_size
4393 && host_integerp (gnu_size, 1)
4394 && integer_pow2p (gnu_size))
4395 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4397 /* See if we need to pad the type. If we did, and made a record,
4398 the name of the new type may be changed. So get it back for
4399 us when we make the new TYPE_DECL below. */
4400 if (gnu_size || align > 0)
4401 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4402 "PAD", true, definition, false);
4404 if (TREE_CODE (gnu_type) == RECORD_TYPE
4405 && TYPE_IS_PADDING_P (gnu_type))
4407 gnu_entity_id = TYPE_NAME (gnu_type);
4408 if (TREE_CODE (gnu_entity_id) == TYPE_DECL)
4409 gnu_entity_id = DECL_NAME (gnu_entity_id);
4412 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4414 /* If we are at global level, GCC will have applied variable_size to
4415 the type, but that won't have done anything. So, if it's not
4416 a constant or self-referential, call elaborate_expression_1 to
4417 make a variable for the size rather than calculating it each time.
4418 Handle both the RM size and the actual size. */
4419 if (global_bindings_p ()
4420 && TYPE_SIZE (gnu_type)
4421 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4422 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4424 if (TREE_CODE (gnu_type) == RECORD_TYPE
4425 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4426 TYPE_SIZE (gnu_type), 0))
4428 TYPE_SIZE (gnu_type)
4429 = elaborate_expression_1 (gnat_entity, gnat_entity,
4430 TYPE_SIZE (gnu_type),
4431 get_identifier ("SIZE"),
4433 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4437 TYPE_SIZE (gnu_type)
4438 = elaborate_expression_1 (gnat_entity, gnat_entity,
4439 TYPE_SIZE (gnu_type),
4440 get_identifier ("SIZE"),
4443 /* ??? For now, store the size as a multiple of the alignment
4444 in bytes so that we can see the alignment from the tree. */
4445 TYPE_SIZE_UNIT (gnu_type)
4447 (MULT_EXPR, sizetype,
4448 elaborate_expression_1
4449 (gnat_entity, gnat_entity,
4450 build_binary_op (EXACT_DIV_EXPR, sizetype,
4451 TYPE_SIZE_UNIT (gnu_type),
4452 size_int (TYPE_ALIGN (gnu_type)
4454 get_identifier ("SIZE_A_UNIT"),
4456 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4458 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4461 elaborate_expression_1 (gnat_entity,
4463 TYPE_ADA_SIZE (gnu_type),
4464 get_identifier ("RM_SIZE"),
4469 /* If this is a record type or subtype, call elaborate_expression_1 on
4470 any field position. Do this for both global and local types.
4471 Skip any fields that we haven't made trees for to avoid problems with
4472 class wide types. */
4473 if (IN (kind, Record_Kind))
4474 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4475 gnat_temp = Next_Entity (gnat_temp))
4476 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4478 tree gnu_field = get_gnu_tree (gnat_temp);
4480 /* ??? Unfortunately, GCC needs to be able to prove the
4481 alignment of this offset and if it's a variable, it can't.
4482 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4483 right now, we have to put in an explicit multiply and
4484 divide by that value. */
4485 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4487 DECL_FIELD_OFFSET (gnu_field)
4489 (MULT_EXPR, sizetype,
4490 elaborate_expression_1
4491 (gnat_temp, gnat_temp,
4492 build_binary_op (EXACT_DIV_EXPR, sizetype,
4493 DECL_FIELD_OFFSET (gnu_field),
4494 size_int (DECL_OFFSET_ALIGN (gnu_field)
4496 get_identifier ("OFFSET"),
4498 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4500 /* ??? The context of gnu_field is not necessarily gnu_type so
4501 the MULT_EXPR node built above may not be marked by the call
4502 to create_type_decl below. */
4503 if (global_bindings_p ())
4504 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4508 gnu_type = build_qualified_type (gnu_type,
4509 (TYPE_QUALS (gnu_type)
4510 | (TYPE_QUAL_VOLATILE
4511 * Treat_As_Volatile (gnat_entity))));
4513 if (Is_Atomic (gnat_entity))
4514 check_ok_for_atomic (gnu_type, gnat_entity, false);
4516 if (Present (Alignment_Clause (gnat_entity)))
4517 TYPE_USER_ALIGN (gnu_type) = 1;
4519 if (Universal_Aliasing (gnat_entity))
4520 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4523 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4524 !Comes_From_Source (gnat_entity),
4525 debug_info_p, gnat_entity);
4527 TREE_TYPE (gnu_decl) = gnu_type;
4530 if (IN (kind, Type_Kind) && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4532 gnu_type = TREE_TYPE (gnu_decl);
4534 /* Back-annotate the Alignment of the type if not already in the
4535 tree. Likewise for sizes. */
4536 if (Unknown_Alignment (gnat_entity))
4537 Set_Alignment (gnat_entity,
4538 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4540 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4542 /* If the size is self-referential, we annotate the maximum
4543 value of that size. */
4544 tree gnu_size = TYPE_SIZE (gnu_type);
4546 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4547 gnu_size = max_size (gnu_size, true);
4549 Set_Esize (gnat_entity, annotate_value (gnu_size));
4551 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4553 /* In this mode the tag and the parent components are not
4554 generated by the front-end, so the sizes must be adjusted
4556 int size_offset, new_size;
4558 if (Is_Derived_Type (gnat_entity))
4561 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4562 Set_Alignment (gnat_entity,
4563 Alignment (Etype (Base_Type (gnat_entity))));
4566 size_offset = POINTER_SIZE;
4568 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4569 Set_Esize (gnat_entity,
4570 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4571 / POINTER_SIZE) * POINTER_SIZE));
4572 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4576 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4577 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4580 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4581 DECL_ARTIFICIAL (gnu_decl) = 1;
4583 if (!debug_info_p && DECL_P (gnu_decl)
4584 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4585 && No (Renamed_Object (gnat_entity)))
4586 DECL_IGNORED_P (gnu_decl) = 1;
4588 /* If we haven't already, associate the ..._DECL node that we just made with
4589 the input GNAT entity node. */
4591 save_gnu_tree (gnat_entity, gnu_decl, false);
4593 /* If this is an enumeral or floating-point type, we were not able to set
4594 the bounds since they refer to the type. These bounds are always static.
4596 For enumeration types, also write debugging information and declare the
4597 enumeration literal table, if needed. */
4599 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4600 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4602 tree gnu_scalar_type = gnu_type;
4604 /* If this is a padded type, we need to use the underlying type. */
4605 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4606 && TYPE_IS_PADDING_P (gnu_scalar_type))
4607 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4609 /* If this is a floating point type and we haven't set a floating
4610 point type yet, use this in the evaluation of the bounds. */
4611 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4612 longest_float_type_node = gnu_type;
4614 TYPE_MIN_VALUE (gnu_scalar_type)
4615 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4616 TYPE_MAX_VALUE (gnu_scalar_type)
4617 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4619 if (TREE_CODE (gnu_scalar_type) == ENUMERAL_TYPE)
4621 /* Since this has both a typedef and a tag, avoid outputting
4623 DECL_ARTIFICIAL (gnu_decl) = 1;
4624 rest_of_type_decl_compilation (gnu_decl);
4628 /* If we deferred processing of incomplete types, re-enable it. If there
4629 were no other disables and we have some to process, do so. */
4630 if (this_deferred && --defer_incomplete_level == 0)
4632 if (defer_incomplete_list)
4634 struct incomplete *incp, *next;
4636 /* We are back to level 0 for the deferring of incomplete types.
4637 But processing these incomplete types below may itself require
4638 deferring, so preserve what we have and restart from scratch. */
4639 incp = defer_incomplete_list;
4640 defer_incomplete_list = NULL;
4642 /* For finalization, however, all types must be complete so we
4643 cannot do the same because deferred incomplete types may end up
4644 referencing each other. Process them all recursively first. */
4645 defer_finalize_level++;
4647 for (; incp; incp = next)
4652 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4653 gnat_to_gnu_type (incp->full_type));
4657 defer_finalize_level--;
4660 /* All the deferred incomplete types have been processed so we can
4661 now proceed with the finalization of the deferred types. */
4662 if (defer_finalize_level == 0 && defer_finalize_list)
4667 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4668 rest_of_type_decl_compilation_no_defer (t);
4670 VEC_free (tree, heap, defer_finalize_list);
4674 /* If we are not defining this type, see if it's in the incomplete list.
4675 If so, handle that list entry now. */
4676 else if (!definition)
4678 struct incomplete *incp;
4680 for (incp = defer_incomplete_list; incp; incp = incp->next)
4681 if (incp->old_type && incp->full_type == gnat_entity)
4683 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4684 TREE_TYPE (gnu_decl));
4685 incp->old_type = NULL_TREE;
4692 if (Is_Packed_Array_Type (gnat_entity)
4693 && Is_Itype (Associated_Node_For_Itype (gnat_entity))
4694 && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity)))
4695 && !present_gnu_tree (Associated_Node_For_Itype (gnat_entity)))
4696 gnat_to_gnu_entity (Associated_Node_For_Itype (gnat_entity), NULL_TREE, 0);
4701 /* Similar, but if the returned value is a COMPONENT_REF, return the
4705 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4707 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4709 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4710 gnu_field = TREE_OPERAND (gnu_field, 1);
4715 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4716 Every TYPE_DECL generated for a type definition must be passed
4717 to this function once everything else has been done for it. */
4720 rest_of_type_decl_compilation (tree decl)
4722 /* We need to defer finalizing the type if incomplete types
4723 are being deferred or if they are being processed. */
4724 if (defer_incomplete_level || defer_finalize_level)
4725 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4727 rest_of_type_decl_compilation_no_defer (decl);
4730 /* Same as above but without deferring the compilation. This
4731 function should not be invoked directly on a TYPE_DECL. */
4734 rest_of_type_decl_compilation_no_defer (tree decl)
4736 const int toplev = global_bindings_p ();
4737 tree t = TREE_TYPE (decl);
4739 rest_of_decl_compilation (decl, toplev, 0);
4741 /* Now process all the variants. This is needed for STABS. */
4742 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4744 if (t == TREE_TYPE (decl))
4747 if (!TYPE_STUB_DECL (t))
4749 TYPE_STUB_DECL (t) = build_decl (TYPE_DECL, DECL_NAME (decl), t);
4750 DECL_ARTIFICIAL (TYPE_STUB_DECL (t)) = 1;
4753 rest_of_type_compilation (t, toplev);
4757 /* Finalize any From_With_Type incomplete types. We do this after processing
4758 our compilation unit and after processing its spec, if this is a body. */
4761 finalize_from_with_types (void)
4763 struct incomplete *incp = defer_limited_with;
4764 struct incomplete *next;
4766 defer_limited_with = 0;
4767 for (; incp; incp = next)
4771 if (incp->old_type != 0)
4772 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4773 gnat_to_gnu_type (incp->full_type));
4778 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4779 kind of type (such E_Task_Type) that has a different type which Gigi
4780 uses for its representation. If the type does not have a special type
4781 for its representation, return GNAT_ENTITY. If a type is supposed to
4782 exist, but does not, abort unless annotating types, in which case
4783 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4786 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4788 Entity_Id gnat_equiv = gnat_entity;
4790 if (No (gnat_entity))
4793 switch (Ekind (gnat_entity))
4795 case E_Class_Wide_Subtype:
4796 if (Present (Equivalent_Type (gnat_entity)))
4797 gnat_equiv = Equivalent_Type (gnat_entity);
4800 case E_Access_Protected_Subprogram_Type:
4801 case E_Anonymous_Access_Protected_Subprogram_Type:
4802 gnat_equiv = Equivalent_Type (gnat_entity);
4805 case E_Class_Wide_Type:
4806 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
4807 ? Equivalent_Type (gnat_entity)
4808 : Root_Type (gnat_entity));
4812 case E_Task_Subtype:
4813 case E_Protected_Type:
4814 case E_Protected_Subtype:
4815 gnat_equiv = Corresponding_Record_Type (gnat_entity);
4822 gcc_assert (Present (gnat_equiv) || type_annotate_only);
4826 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
4827 using MECH as its passing mechanism, to be placed in the parameter
4828 list built for GNAT_SUBPROG. Assume a foreign convention for the
4829 latter if FOREIGN is true. Also set CICO to true if the parameter
4830 must use the copy-in copy-out implementation mechanism.
4832 The returned tree is a PARM_DECL, except for those cases where no
4833 parameter needs to be actually passed to the subprogram; the type
4834 of this "shadow" parameter is then returned instead. */
4837 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
4838 Entity_Id gnat_subprog, bool foreign, bool *cico)
4840 tree gnu_param_name = get_entity_name (gnat_param);
4841 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4842 tree gnu_param_type_alt = NULL_TREE;
4843 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
4844 /* The parameter can be indirectly modified if its address is taken. */
4845 bool ro_param = in_param && !Address_Taken (gnat_param);
4846 bool by_return = false, by_component_ptr = false, by_ref = false;
4849 /* Copy-return is used only for the first parameter of a valued procedure.
4850 It's a copy mechanism for which a parameter is never allocated. */
4851 if (mech == By_Copy_Return)
4853 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
4858 /* If this is either a foreign function or if the underlying type won't
4859 be passed by reference, strip off possible padding type. */
4860 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
4861 && TYPE_IS_PADDING_P (gnu_param_type))
4863 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
4865 if (mech == By_Reference
4867 || (!must_pass_by_ref (unpadded_type)
4868 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
4869 gnu_param_type = unpadded_type;
4872 /* If this is a read-only parameter, make a variant of the type that is
4873 read-only. ??? However, if this is an unconstrained array, that type
4874 can be very complex, so skip it for now. Likewise for any other
4875 self-referential type. */
4877 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
4878 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
4879 gnu_param_type = build_qualified_type (gnu_param_type,
4880 (TYPE_QUALS (gnu_param_type)
4881 | TYPE_QUAL_CONST));
4883 /* For foreign conventions, pass arrays as pointers to the element type.
4884 First check for unconstrained array and get the underlying array. */
4885 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
4887 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
4889 /* VMS descriptors are themselves passed by reference. */
4890 if (mech == By_Short_Descriptor ||
4891 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
4893 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
4894 Mechanism (gnat_param),
4896 else if (mech == By_Descriptor)
4898 /* Build both a 32-bit and 64-bit descriptor, one of which will be
4899 chosen in fill_vms_descriptor. */
4901 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
4902 Mechanism (gnat_param),
4905 = build_pointer_type (build_vms_descriptor (gnu_param_type,
4906 Mechanism (gnat_param),
4910 /* Arrays are passed as pointers to element type for foreign conventions. */
4913 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
4915 /* Strip off any multi-dimensional entries, then strip
4916 off the last array to get the component type. */
4917 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
4918 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
4919 gnu_param_type = TREE_TYPE (gnu_param_type);
4921 by_component_ptr = true;
4922 gnu_param_type = TREE_TYPE (gnu_param_type);
4925 gnu_param_type = build_qualified_type (gnu_param_type,
4926 (TYPE_QUALS (gnu_param_type)
4927 | TYPE_QUAL_CONST));
4929 gnu_param_type = build_pointer_type (gnu_param_type);
4932 /* Fat pointers are passed as thin pointers for foreign conventions. */
4933 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
4935 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
4937 /* If we must pass or were requested to pass by reference, do so.
4938 If we were requested to pass by copy, do so.
4939 Otherwise, for foreign conventions, pass In Out or Out parameters
4940 or aggregates by reference. For COBOL and Fortran, pass all
4941 integer and FP types that way too. For Convention Ada, use
4942 the standard Ada default. */
4943 else if (must_pass_by_ref (gnu_param_type)
4944 || mech == By_Reference
4947 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
4949 && (Convention (gnat_subprog) == Convention_Fortran
4950 || Convention (gnat_subprog) == Convention_COBOL)
4951 && (INTEGRAL_TYPE_P (gnu_param_type)
4952 || FLOAT_TYPE_P (gnu_param_type)))
4954 && default_pass_by_ref (gnu_param_type)))))
4956 gnu_param_type = build_reference_type (gnu_param_type);
4960 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
4964 if (mech == By_Copy && (by_ref || by_component_ptr))
4965 post_error ("?cannot pass & by copy", gnat_param);
4967 /* If this is an Out parameter that isn't passed by reference and isn't
4968 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
4969 it will be a VAR_DECL created when we process the procedure, so just
4970 return its type. For the special parameter of a valued procedure,
4973 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
4974 Out parameters with discriminants or implicit initial values to be
4975 handled like In Out parameters. These type are normally built as
4976 aggregates, hence passed by reference, except for some packed arrays
4977 which end up encoded in special integer types.
4979 The exception we need to make is then for packed arrays of records
4980 with discriminants or implicit initial values. We have no light/easy
4981 way to check for the latter case, so we merely check for packed arrays
4982 of records. This may lead to useless copy-in operations, but in very
4983 rare cases only, as these would be exceptions in a set of already
4984 exceptional situations. */
4985 if (Ekind (gnat_param) == E_Out_Parameter
4988 || (mech != By_Descriptor
4989 && mech != By_Short_Descriptor
4990 && !POINTER_TYPE_P (gnu_param_type)
4991 && !AGGREGATE_TYPE_P (gnu_param_type)))
4992 && !(Is_Array_Type (Etype (gnat_param))
4993 && Is_Packed (Etype (gnat_param))
4994 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
4995 return gnu_param_type;
4997 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
4998 ro_param || by_ref || by_component_ptr);
4999 DECL_BY_REF_P (gnu_param) = by_ref;
5000 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5001 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5002 mech == By_Short_Descriptor);
5003 DECL_POINTS_TO_READONLY_P (gnu_param)
5004 = (ro_param && (by_ref || by_component_ptr));
5006 /* Save the alternate descriptor type, if any. */
5007 if (gnu_param_type_alt)
5008 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5010 /* If no Mechanism was specified, indicate what we're using, then
5011 back-annotate it. */
5012 if (mech == Default)
5013 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5015 Set_Mechanism (gnat_param, mech);
5019 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5022 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5024 while (Present (Corresponding_Discriminant (discr1)))
5025 discr1 = Corresponding_Discriminant (discr1);
5027 while (Present (Corresponding_Discriminant (discr2)))
5028 discr2 = Corresponding_Discriminant (discr2);
5031 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5034 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
5035 a non-aliased component in the back-end sense. */
5038 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
5040 /* If the type below this is a multi-array type, then
5041 this does not have aliased components. */
5042 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5043 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5046 if (Has_Aliased_Components (gnat_type))
5049 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5052 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5053 be elaborated at the point of its definition, but do nothing else. */
5056 elaborate_entity (Entity_Id gnat_entity)
5058 switch (Ekind (gnat_entity))
5060 case E_Signed_Integer_Subtype:
5061 case E_Modular_Integer_Subtype:
5062 case E_Enumeration_Subtype:
5063 case E_Ordinary_Fixed_Point_Subtype:
5064 case E_Decimal_Fixed_Point_Subtype:
5065 case E_Floating_Point_Subtype:
5067 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5068 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5070 /* ??? Tests for avoiding static constraint error expression
5071 is needed until the front stops generating bogus conversions
5072 on bounds of real types. */
5074 if (!Raises_Constraint_Error (gnat_lb))
5075 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5076 1, 0, Needs_Debug_Info (gnat_entity));
5077 if (!Raises_Constraint_Error (gnat_hb))
5078 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5079 1, 0, Needs_Debug_Info (gnat_entity));
5085 Node_Id full_definition = Declaration_Node (gnat_entity);
5086 Node_Id record_definition = Type_Definition (full_definition);
5088 /* If this is a record extension, go a level further to find the
5089 record definition. */
5090 if (Nkind (record_definition) == N_Derived_Type_Definition)
5091 record_definition = Record_Extension_Part (record_definition);
5095 case E_Record_Subtype:
5096 case E_Private_Subtype:
5097 case E_Limited_Private_Subtype:
5098 case E_Record_Subtype_With_Private:
5099 if (Is_Constrained (gnat_entity)
5100 && Has_Discriminants (Base_Type (gnat_entity))
5101 && Present (Discriminant_Constraint (gnat_entity)))
5103 Node_Id gnat_discriminant_expr;
5104 Entity_Id gnat_field;
5106 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
5107 gnat_discriminant_expr
5108 = First_Elmt (Discriminant_Constraint (gnat_entity));
5109 Present (gnat_field);
5110 gnat_field = Next_Discriminant (gnat_field),
5111 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5112 /* ??? For now, ignore access discriminants. */
5113 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5114 elaborate_expression (Node (gnat_discriminant_expr),
5116 get_entity_name (gnat_field), 1, 0, 0);
5123 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5124 any entities on its entity chain similarly. */
5127 mark_out_of_scope (Entity_Id gnat_entity)
5129 Entity_Id gnat_sub_entity;
5130 unsigned int kind = Ekind (gnat_entity);
5132 /* If this has an entity list, process all in the list. */
5133 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5134 || IN (kind, Private_Kind)
5135 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5136 || kind == E_Function || kind == E_Generic_Function
5137 || kind == E_Generic_Package || kind == E_Generic_Procedure
5138 || kind == E_Loop || kind == E_Operator || kind == E_Package
5139 || kind == E_Package_Body || kind == E_Procedure
5140 || kind == E_Record_Type || kind == E_Record_Subtype
5141 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5142 for (gnat_sub_entity = First_Entity (gnat_entity);
5143 Present (gnat_sub_entity);
5144 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5145 if (Scope (gnat_sub_entity) == gnat_entity
5146 && gnat_sub_entity != gnat_entity)
5147 mark_out_of_scope (gnat_sub_entity);
5149 /* Now clear this if it has been defined, but only do so if it isn't
5150 a subprogram or parameter. We could refine this, but it isn't
5151 worth it. If this is statically allocated, it is supposed to
5152 hang around out of cope. */
5153 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5154 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5156 save_gnu_tree (gnat_entity, NULL_TREE, true);
5157 save_gnu_tree (gnat_entity, error_mark_node, true);
5161 /* Set the alias set of GNU_NEW_TYPE to be that of GNU_OLD_TYPE. If this
5162 is a multi-dimensional array type, do this recursively. */
5165 copy_alias_set (tree gnu_new_type, tree gnu_old_type)
5167 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5168 of a one-dimensional array, since the padding has the same alias set
5169 as the field type, but if it's a multi-dimensional array, we need to
5170 see the inner types. */
5171 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5172 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5173 || TYPE_IS_PADDING_P (gnu_old_type)))
5174 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5176 /* We need to be careful here in case GNU_OLD_TYPE is an unconstrained
5177 array. In that case, it doesn't have the same shape as GNU_NEW_TYPE,
5178 so we need to go down to what does. */
5179 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5181 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5183 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5184 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5185 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5186 copy_alias_set (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type));
5188 /* The alias set shouldn't be copied between array types with different
5189 aliasing settings because this can break the aliasing relationship
5190 between the array type and its element type. */
5191 #ifndef ENABLE_CHECKING
5192 if (flag_strict_aliasing)
5194 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5195 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5196 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5197 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5199 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5200 record_component_aliases (gnu_new_type);
5203 /* Return a TREE_LIST describing the substitutions needed to reflect
5204 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
5205 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
5206 of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE
5207 gives the tree for the discriminant and TREE_VALUES is the replacement
5208 value. They are in the form of operands to substitute_in_expr.
5209 DEFINITION is as in gnat_to_gnu_entity. */
5212 substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type,
5213 tree gnu_list, bool definition)
5215 Entity_Id gnat_discrim;
5219 gnat_type = Implementation_Base_Type (gnat_subtype);
5221 if (Has_Discriminants (gnat_type))
5222 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5223 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5224 Present (gnat_discrim);
5225 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5226 gnat_value = Next_Elmt (gnat_value))
5227 /* Ignore access discriminants. */
5228 if (!Is_Access_Type (Etype (Node (gnat_value))))
5229 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5230 elaborate_expression
5231 (Node (gnat_value), gnat_subtype,
5232 get_entity_name (gnat_discrim), definition,
5239 /* Return true if the size represented by GNU_SIZE can be handled by an
5240 allocation. If STATIC_P is true, consider only what can be done with a
5241 static allocation. */
5244 allocatable_size_p (tree gnu_size, bool static_p)
5246 HOST_WIDE_INT our_size;
5248 /* If this is not a static allocation, the only case we want to forbid
5249 is an overflowing size. That will be converted into a raise a
5252 return !(TREE_CODE (gnu_size) == INTEGER_CST
5253 && TREE_OVERFLOW (gnu_size));
5255 /* Otherwise, we need to deal with both variable sizes and constant
5256 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5257 since assemblers may not like very large sizes. */
5258 if (!host_integerp (gnu_size, 1))
5261 our_size = tree_low_cst (gnu_size, 1);
5262 return (int) our_size == our_size;
5265 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5266 NAME, ARGS and ERROR_POINT. */
5269 prepend_one_attribute_to (struct attrib ** attr_list,
5270 enum attr_type attr_type,
5273 Node_Id attr_error_point)
5275 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5277 attr->type = attr_type;
5278 attr->name = attr_name;
5279 attr->args = attr_args;
5280 attr->error_point = attr_error_point;
5282 attr->next = *attr_list;
5286 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5289 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5293 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5294 gnat_temp = Next_Rep_Item (gnat_temp))
5295 if (Nkind (gnat_temp) == N_Pragma)
5297 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5298 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5299 enum attr_type etype;
5301 if (Present (gnat_assoc) && Present (First (gnat_assoc))
5302 && Present (Next (First (gnat_assoc)))
5303 && (Nkind (Expression (Next (First (gnat_assoc))))
5304 == N_String_Literal))
5306 gnu_arg0 = get_identifier (TREE_STRING_POINTER
5309 (First (gnat_assoc))))));
5310 if (Present (Next (Next (First (gnat_assoc))))
5311 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
5312 == N_String_Literal))
5313 gnu_arg1 = get_identifier (TREE_STRING_POINTER
5317 (First (gnat_assoc)))))));
5320 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5322 case Pragma_Machine_Attribute:
5323 etype = ATTR_MACHINE_ATTRIBUTE;
5326 case Pragma_Linker_Alias:
5327 etype = ATTR_LINK_ALIAS;
5330 case Pragma_Linker_Section:
5331 etype = ATTR_LINK_SECTION;
5334 case Pragma_Linker_Constructor:
5335 etype = ATTR_LINK_CONSTRUCTOR;
5338 case Pragma_Linker_Destructor:
5339 etype = ATTR_LINK_DESTRUCTOR;
5342 case Pragma_Weak_External:
5343 etype = ATTR_WEAK_EXTERNAL;
5351 /* Prepend to the list now. Make a list of the argument we might
5352 have, as GCC expects it. */
5353 prepend_one_attribute_to
5356 (gnu_arg1 != NULL_TREE)
5357 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5358 Present (Next (First (gnat_assoc)))
5359 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5363 /* Get the unpadded version of a GNAT type. */
5366 get_unpadded_type (Entity_Id gnat_entity)
5368 tree type = gnat_to_gnu_type (gnat_entity);
5370 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5371 type = TREE_TYPE (TYPE_FIELDS (type));
5376 /* Called when we need to protect a variable object using a save_expr. */
5379 maybe_variable (tree gnu_operand)
5381 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
5382 || TREE_CODE (gnu_operand) == SAVE_EXPR
5383 || TREE_CODE (gnu_operand) == NULL_EXPR)
5386 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5388 tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF,
5389 TREE_TYPE (gnu_operand),
5390 variable_size (TREE_OPERAND (gnu_operand, 0)));
5392 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5393 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5397 return variable_size (gnu_operand);
5400 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5401 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5402 return the GCC tree to use for that expression. GNU_NAME is the
5403 qualification to use if an external name is appropriate and DEFINITION is
5404 nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero,
5405 we need a result. Otherwise, we are just elaborating this for
5406 side-effects. If NEED_DEBUG is nonzero we need the symbol for debugging
5407 purposes even if it isn't needed for code generation. */
5410 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity,
5411 tree gnu_name, bool definition, bool need_value,
5416 /* If we already elaborated this expression (e.g., it was involved
5417 in the definition of a private type), use the old value. */
5418 if (present_gnu_tree (gnat_expr))
5419 return get_gnu_tree (gnat_expr);
5421 /* If we don't need a value and this is static or a discriminant, we
5422 don't need to do anything. */
5423 else if (!need_value
5424 && (Is_OK_Static_Expression (gnat_expr)
5425 || (Nkind (gnat_expr) == N_Identifier
5426 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5429 /* Otherwise, convert this tree to its GCC equivalent. */
5431 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
5432 gnu_name, definition, need_debug);
5434 /* Save the expression in case we try to elaborate this entity again. Since
5435 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5436 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5437 save_gnu_tree (gnat_expr, gnu_expr, true);
5439 return need_value ? gnu_expr : error_mark_node;
5442 /* Similar, but take a GNU expression. */
5445 elaborate_expression_1 (Node_Id gnat_expr, Entity_Id gnat_entity,
5446 tree gnu_expr, tree gnu_name, bool definition,
5449 tree gnu_decl = NULL_TREE;
5450 /* Skip any conversions and simple arithmetics to see if the expression
5451 is a read-only variable.
5452 ??? This really should remain read-only, but we have to think about
5453 the typing of the tree here. */
5455 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5456 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5459 /* In most cases, we won't see a naked FIELD_DECL here because a
5460 discriminant reference will have been replaced with a COMPONENT_REF
5461 when the type is being elaborated. However, there are some cases
5462 involving child types where we will. So convert it to a COMPONENT_REF
5463 here. We have to hope it will be at the highest level of the
5464 expression in these cases. */
5465 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5466 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5467 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5468 gnu_expr, NULL_TREE);
5470 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5471 that is read-only, make a variable that is initialized to contain the
5472 bound when the package containing the definition is elaborated. If
5473 this entity is defined at top level and a bound or discriminant value
5474 isn't a constant or a reference to a discriminant, replace the bound
5475 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5476 rely here on the fact that an expression cannot contain both the
5477 discriminant and some other variable. */
5479 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5480 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5481 && (TREE_READONLY (gnu_inner_expr)
5482 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5483 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5485 /* If this is a static expression or contains a discriminant, we don't
5486 need the variable for debugging (and can't elaborate anyway if a
5489 && (Is_OK_Static_Expression (gnat_expr)
5490 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
5493 /* Now create the variable if we need it. */
5494 if (need_debug || (expr_variable && expr_global))
5496 = create_var_decl (create_concat_name (gnat_entity,
5497 IDENTIFIER_POINTER (gnu_name)),
5498 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5499 !need_debug, Is_Public (gnat_entity),
5500 !definition, false, NULL, gnat_entity);
5502 /* We only need to use this variable if we are in global context since GCC
5503 can do the right thing in the local case. */
5504 if (expr_global && expr_variable)
5506 else if (!expr_variable)
5509 return maybe_variable (gnu_expr);
5512 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5513 starting bit position so that it is aligned to ALIGN bits, and leaving at
5514 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5515 record is guaranteed to get. */
5518 make_aligning_type (tree type, unsigned int align, tree size,
5519 unsigned int base_align, int room)
5521 /* We will be crafting a record type with one field at a position set to be
5522 the next multiple of ALIGN past record'address + room bytes. We use a
5523 record placeholder to express record'address. */
5525 tree record_type = make_node (RECORD_TYPE);
5526 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5529 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5531 /* The diagram below summarizes the shape of what we manipulate:
5533 <--------- pos ---------->
5534 { +------------+-------------+-----------------+
5535 record =>{ |############| ... | field (type) |
5536 { +------------+-------------+-----------------+
5537 |<-- room -->|<- voffset ->|<---- size ----->|
5540 record_addr vblock_addr
5542 Every length is in sizetype bytes there, except "pos" which has to be
5543 set as a bit position in the GCC tree for the record. */
5545 tree room_st = size_int (room);
5546 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5547 tree voffset_st, pos, field;
5549 tree name = TYPE_NAME (type);
5551 if (TREE_CODE (name) == TYPE_DECL)
5552 name = DECL_NAME (name);
5554 TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN");
5556 /* Compute VOFFSET and then POS. The next byte position multiple of some
5557 alignment after some address is obtained by "and"ing the alignment minus
5558 1 with the two's complement of the address. */
5560 voffset_st = size_binop (BIT_AND_EXPR,
5561 size_diffop (size_zero_node, vblock_addr_st),
5562 ssize_int ((align / BITS_PER_UNIT) - 1));
5564 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5566 pos = size_binop (MULT_EXPR,
5567 convert (bitsizetype,
5568 size_binop (PLUS_EXPR, room_st, voffset_st)),
5571 /* Craft the GCC record representation. We exceptionally do everything
5572 manually here because 1) our generic circuitry is not quite ready to
5573 handle the complex position/size expressions we are setting up, 2) we
5574 have a strong simplifying factor at hand: we know the maximum possible
5575 value of voffset, and 3) we have to set/reset at least the sizes in
5576 accordance with this maximum value anyway, as we need them to convey
5577 what should be "alloc"ated for this type.
5579 Use -1 as the 'addressable' indication for the field to prevent the
5580 creation of a bitfield. We don't need one, it would have damaging
5581 consequences on the alignment computation, and create_field_decl would
5582 make one without this special argument, for instance because of the
5583 complex position expression. */
5585 field = create_field_decl (get_identifier ("F"), type, record_type,
5587 TYPE_FIELDS (record_type) = field;
5589 TYPE_ALIGN (record_type) = base_align;
5590 TYPE_USER_ALIGN (record_type) = 1;
5592 TYPE_SIZE (record_type)
5593 = size_binop (PLUS_EXPR,
5594 size_binop (MULT_EXPR, convert (bitsizetype, size),
5596 bitsize_int (align + room * BITS_PER_UNIT));
5597 TYPE_SIZE_UNIT (record_type)
5598 = size_binop (PLUS_EXPR, size,
5599 size_int (room + align / BITS_PER_UNIT));
5601 SET_TYPE_MODE (record_type, BLKmode);
5603 copy_alias_set (record_type, type);
5607 /* Return the result of rounding T up to ALIGN. */
5609 static inline unsigned HOST_WIDE_INT
5610 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5618 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5619 as the field type of a packed record if IN_RECORD is true, or as the
5620 component type of a packed array if IN_RECORD is false. See if we can
5621 rewrite it either as a type that has a non-BLKmode, which we can pack
5622 tighter in the packed record case, or as a smaller type with BLKmode.
5623 If so, return the new type. If not, return the original type. */
5626 make_packable_type (tree type, bool in_record)
5628 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5629 unsigned HOST_WIDE_INT new_size;
5630 tree new_type, old_field, field_list = NULL_TREE;
5632 /* No point in doing anything if the size is zero. */
5636 new_type = make_node (TREE_CODE (type));
5638 /* Copy the name and flags from the old type to that of the new.
5639 Note that we rely on the pointer equality created here for
5640 TYPE_NAME to look through conversions in various places. */
5641 TYPE_NAME (new_type) = TYPE_NAME (type);
5642 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5643 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5644 if (TREE_CODE (type) == RECORD_TYPE)
5645 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5647 /* If we are in a record and have a small size, set the alignment to
5648 try for an integral mode. Otherwise set it to try for a smaller
5649 type with BLKmode. */
5650 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5652 TYPE_ALIGN (new_type) = ceil_alignment (size);
5653 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5657 unsigned HOST_WIDE_INT align;
5659 /* Do not try to shrink the size if the RM size is not constant. */
5660 if (TYPE_CONTAINS_TEMPLATE_P (type)
5661 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5664 /* Round the RM size up to a unit boundary to get the minimal size
5665 for a BLKmode record. Give up if it's already the size. */
5666 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5667 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5668 if (new_size == size)
5671 align = new_size & -new_size;
5672 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5675 TYPE_USER_ALIGN (new_type) = 1;
5677 /* Now copy the fields, keeping the position and size as we don't want
5678 to change the layout by propagating the packedness downwards. */
5679 for (old_field = TYPE_FIELDS (type); old_field;
5680 old_field = TREE_CHAIN (old_field))
5682 tree new_field_type = TREE_TYPE (old_field);
5683 tree new_field, new_size;
5685 if (TYPE_MODE (new_field_type) == BLKmode
5686 && (TREE_CODE (new_field_type) == RECORD_TYPE
5687 || TREE_CODE (new_field_type) == UNION_TYPE
5688 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5689 && host_integerp (TYPE_SIZE (new_field_type), 1))
5690 new_field_type = make_packable_type (new_field_type, true);
5692 /* However, for the last field in a not already packed record type
5693 that is of an aggregate type, we need to use the RM_Size in the
5694 packable version of the record type, see finish_record_type. */
5695 if (!TREE_CHAIN (old_field)
5696 && !TYPE_PACKED (type)
5697 && (TREE_CODE (new_field_type) == RECORD_TYPE
5698 || TREE_CODE (new_field_type) == UNION_TYPE
5699 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5700 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5701 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5702 && TYPE_ADA_SIZE (new_field_type))
5703 new_size = TYPE_ADA_SIZE (new_field_type);
5705 new_size = DECL_SIZE (old_field);
5707 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5708 new_type, TYPE_PACKED (type), new_size,
5709 bit_position (old_field),
5710 !DECL_NONADDRESSABLE_P (old_field));
5712 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
5713 SET_DECL_ORIGINAL_FIELD
5714 (new_field, (DECL_ORIGINAL_FIELD (old_field)
5715 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
5717 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
5718 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
5720 TREE_CHAIN (new_field) = field_list;
5721 field_list = new_field;
5724 finish_record_type (new_type, nreverse (field_list), 2, true);
5725 copy_alias_set (new_type, type);
5727 /* If this is a padding record, we never want to make the size smaller
5728 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
5729 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5730 || TREE_CODE (type) == QUAL_UNION_TYPE)
5732 TYPE_SIZE (new_type) = TYPE_SIZE (type);
5733 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
5737 TYPE_SIZE (new_type) = bitsize_int (new_size);
5738 TYPE_SIZE_UNIT (new_type)
5739 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
5742 if (!TYPE_CONTAINS_TEMPLATE_P (type))
5743 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
5745 compute_record_mode (new_type);
5747 /* Try harder to get a packable type if necessary, for example
5748 in case the record itself contains a BLKmode field. */
5749 if (in_record && TYPE_MODE (new_type) == BLKmode)
5750 SET_TYPE_MODE (new_type,
5751 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
5753 /* If neither the mode nor the size has shrunk, return the old type. */
5754 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
5760 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
5761 if needed. We have already verified that SIZE and TYPE are large enough.
5763 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
5766 IS_USER_TYPE is true if we must complete the original type.
5768 DEFINITION is true if this type is being defined.
5770 SAME_RM_SIZE is true if the RM_Size of the resulting type is to be set
5771 to SIZE too; otherwise, it's set to the RM_Size of the original type. */
5774 maybe_pad_type (tree type, tree size, unsigned int align,
5775 Entity_Id gnat_entity, const char *name_trailer,
5776 bool is_user_type, bool definition, bool same_rm_size)
5778 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
5779 tree orig_size = TYPE_SIZE (type);
5780 unsigned int orig_align = align;
5783 /* If TYPE is a padded type, see if it agrees with any size and alignment
5784 we were given. If so, return the original type. Otherwise, strip
5785 off the padding, since we will either be returning the inner type
5786 or repadding it. If no size or alignment is specified, use that of
5787 the original padded type. */
5788 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5791 || operand_equal_p (round_up (size,
5792 MAX (align, TYPE_ALIGN (type))),
5793 round_up (TYPE_SIZE (type),
5794 MAX (align, TYPE_ALIGN (type))),
5796 && (align == 0 || align == TYPE_ALIGN (type)))
5800 size = TYPE_SIZE (type);
5802 align = TYPE_ALIGN (type);
5804 type = TREE_TYPE (TYPE_FIELDS (type));
5805 orig_size = TYPE_SIZE (type);
5808 /* If the size is either not being changed or is being made smaller (which
5809 is not done here (and is only valid for bitfields anyway), show the size
5810 isn't changing. Likewise, clear the alignment if it isn't being
5811 changed. Then return if we aren't doing anything. */
5813 && (operand_equal_p (size, orig_size, 0)
5814 || (TREE_CODE (orig_size) == INTEGER_CST
5815 && tree_int_cst_lt (size, orig_size))))
5818 if (align == TYPE_ALIGN (type))
5821 if (align == 0 && !size)
5824 /* If requested, complete the original type and give it a name. */
5826 create_type_decl (get_entity_name (gnat_entity), type,
5827 NULL, !Comes_From_Source (gnat_entity),
5829 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
5830 && DECL_IGNORED_P (TYPE_NAME (type))),
5833 /* We used to modify the record in place in some cases, but that could
5834 generate incorrect debugging information. So make a new record
5836 record = make_node (RECORD_TYPE);
5837 TYPE_IS_PADDING_P (record) = 1;
5839 if (Present (gnat_entity))
5840 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
5842 TYPE_VOLATILE (record)
5843 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
5845 TYPE_ALIGN (record) = align;
5847 TYPE_USER_ALIGN (record) = align;
5849 TYPE_SIZE (record) = size ? size : orig_size;
5850 TYPE_SIZE_UNIT (record)
5851 = convert (sizetype,
5852 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
5853 bitsize_unit_node));
5855 /* If we are changing the alignment and the input type is a record with
5856 BLKmode and a small constant size, try to make a form that has an
5857 integral mode. This might allow the padding record to also have an
5858 integral mode, which will be much more efficient. There is no point
5859 in doing so if a size is specified unless it is also a small constant
5860 size and it is incorrect to do so if we cannot guarantee that the mode
5861 will be naturally aligned since the field must always be addressable.
5863 ??? This might not always be a win when done for a stand-alone object:
5864 since the nominal and the effective type of the object will now have
5865 different modes, a VIEW_CONVERT_EXPR will be required for converting
5866 between them and it might be hard to overcome afterwards, including
5867 at the RTL level when the stand-alone object is accessed as a whole. */
5869 && TREE_CODE (type) == RECORD_TYPE
5870 && TYPE_MODE (type) == BLKmode
5871 && TREE_CODE (orig_size) == INTEGER_CST
5872 && !TREE_CONSTANT_OVERFLOW (orig_size)
5873 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
5875 || (TREE_CODE (size) == INTEGER_CST
5876 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
5878 tree packable_type = make_packable_type (type, true);
5879 if (TYPE_MODE (packable_type) != BLKmode
5880 && align >= TYPE_ALIGN (packable_type))
5881 type = packable_type;
5884 /* Now create the field with the original size. */
5885 field = create_field_decl (get_identifier ("F"), type, record, 0,
5886 orig_size, bitsize_zero_node, 1);
5887 DECL_INTERNAL_P (field) = 1;
5889 /* Do not finalize it until after the auxiliary record is built. */
5890 finish_record_type (record, field, 1, true);
5892 /* Set the same size for its RM_size if requested; otherwise reuse
5893 the RM_size of the original type. */
5894 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
5896 /* Unless debugging information isn't being written for the input type,
5897 write a record that shows what we are a subtype of and also make a
5898 variable that indicates our size, if still variable. */
5899 if (TYPE_NAME (record)
5900 && AGGREGATE_TYPE_P (type)
5901 && TREE_CODE (orig_size) != INTEGER_CST
5902 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
5903 && DECL_IGNORED_P (TYPE_NAME (type))))
5905 tree marker = make_node (RECORD_TYPE);
5906 tree name = TYPE_NAME (record);
5907 tree orig_name = TYPE_NAME (type);
5909 if (TREE_CODE (name) == TYPE_DECL)
5910 name = DECL_NAME (name);
5912 if (TREE_CODE (orig_name) == TYPE_DECL)
5913 orig_name = DECL_NAME (orig_name);
5915 TYPE_NAME (marker) = concat_id_with_name (name, "XVS");
5916 finish_record_type (marker,
5917 create_field_decl (orig_name, integer_type_node,
5918 marker, 0, NULL_TREE, NULL_TREE,
5922 add_parallel_type (TYPE_STUB_DECL (record), marker);
5924 if (size && TREE_CODE (size) != INTEGER_CST && definition)
5925 create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE,
5926 sizetype, TYPE_SIZE_UNIT (record), false, false,
5927 false, false, NULL, gnat_entity);
5930 rest_of_record_type_compilation (record);
5932 /* If the size was widened explicitly, maybe give a warning. Take the
5933 original size as the maximum size of the input if there was an
5934 unconstrained record involved and round it up to the specified alignment,
5935 if one was specified. */
5936 if (CONTAINS_PLACEHOLDER_P (orig_size))
5937 orig_size = max_size (orig_size, true);
5940 orig_size = round_up (orig_size, align);
5942 if (size && Present (gnat_entity)
5943 && !operand_equal_p (size, orig_size, 0)
5944 && !(TREE_CODE (size) == INTEGER_CST
5945 && TREE_CODE (orig_size) == INTEGER_CST
5946 && tree_int_cst_lt (size, orig_size)))
5948 Node_Id gnat_error_node = Empty;
5950 if (Is_Packed_Array_Type (gnat_entity))
5951 gnat_entity = Original_Array_Type (gnat_entity);
5953 if ((Ekind (gnat_entity) == E_Component
5954 || Ekind (gnat_entity) == E_Discriminant)
5955 && Present (Component_Clause (gnat_entity)))
5956 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
5957 else if (Present (Size_Clause (gnat_entity)))
5958 gnat_error_node = Expression (Size_Clause (gnat_entity));
5960 /* Generate message only for entities that come from source, since
5961 if we have an entity created by expansion, the message will be
5962 generated for some other corresponding source entity. */
5963 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
5964 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
5966 size_diffop (size, orig_size));
5968 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
5969 post_error_ne_tree ("component of& padded{ by ^ bits}?",
5970 gnat_entity, gnat_entity,
5971 size_diffop (size, orig_size));
5977 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
5978 the value passed against the list of choices. */
5981 choices_to_gnu (tree operand, Node_Id choices)
5985 tree result = integer_zero_node;
5986 tree this_test, low = 0, high = 0, single = 0;
5988 for (choice = First (choices); Present (choice); choice = Next (choice))
5990 switch (Nkind (choice))
5993 low = gnat_to_gnu (Low_Bound (choice));
5994 high = gnat_to_gnu (High_Bound (choice));
5996 /* There's no good type to use here, so we might as well use
5997 integer_type_node. */
5999 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6000 build_binary_op (GE_EXPR, integer_type_node,
6002 build_binary_op (LE_EXPR, integer_type_node,
6007 case N_Subtype_Indication:
6008 gnat_temp = Range_Expression (Constraint (choice));
6009 low = gnat_to_gnu (Low_Bound (gnat_temp));
6010 high = gnat_to_gnu (High_Bound (gnat_temp));
6013 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6014 build_binary_op (GE_EXPR, integer_type_node,
6016 build_binary_op (LE_EXPR, integer_type_node,
6021 case N_Expanded_Name:
6022 /* This represents either a subtype range, an enumeration
6023 literal, or a constant Ekind says which. If an enumeration
6024 literal or constant, fall through to the next case. */
6025 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6026 && Ekind (Entity (choice)) != E_Constant)
6028 tree type = gnat_to_gnu_type (Entity (choice));
6030 low = TYPE_MIN_VALUE (type);
6031 high = TYPE_MAX_VALUE (type);
6034 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6035 build_binary_op (GE_EXPR, integer_type_node,
6037 build_binary_op (LE_EXPR, integer_type_node,
6042 /* ... fall through ... */
6044 case N_Character_Literal:
6045 case N_Integer_Literal:
6046 single = gnat_to_gnu (choice);
6047 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6051 case N_Others_Choice:
6052 this_test = integer_one_node;
6059 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6066 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6067 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6070 adjust_packed (tree field_type, tree record_type, int packed)
6072 /* If the field contains an item of variable size, we cannot pack it
6073 because we cannot create temporaries of non-fixed size in case
6074 we need to take the address of the field. See addressable_p and
6075 the notes on the addressability issues for further details. */
6076 if (is_variable_size (field_type))
6079 /* If the alignment of the record is specified and the field type
6080 is over-aligned, request Storage_Unit alignment for the field. */
6083 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6092 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6093 placed in GNU_RECORD_TYPE.
6095 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6096 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6097 record has a specified alignment.
6099 DEFINITION is true if this field is for a record being defined. */
6102 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6105 tree gnu_field_id = get_entity_name (gnat_field);
6106 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6107 tree gnu_field, gnu_size, gnu_pos;
6108 bool needs_strict_alignment
6109 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6110 || Treat_As_Volatile (gnat_field));
6112 /* If this field requires strict alignment, we cannot pack it because
6113 it would very likely be under-aligned in the record. */
6114 if (needs_strict_alignment)
6117 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6119 /* If a size is specified, use it. Otherwise, if the record type is packed,
6120 use the official RM size. See "Handling of Type'Size Values" in Einfo
6121 for further details. */
6122 if (Known_Static_Esize (gnat_field))
6123 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6124 gnat_field, FIELD_DECL, false, true);
6125 else if (packed == 1)
6126 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6127 gnat_field, FIELD_DECL, false, true);
6129 gnu_size = NULL_TREE;
6131 /* If we have a specified size that's smaller than that of the field type,
6132 or a position is specified, and the field type is also a record that's
6133 BLKmode, see if we can get either an integral mode form of the type or
6134 a smaller BLKmode form. If we can, show a size was specified for the
6135 field if there wasn't one already, so we know to make this a bitfield
6136 and avoid making things wider.
6138 Doing this is first useful if the record is packed because we may then
6139 place the field at a non-byte-aligned position and so achieve tighter
6142 This is in addition *required* if the field shares a byte with another
6143 field and the front-end lets the back-end handle the references, because
6144 GCC does not handle BLKmode bitfields properly.
6146 We avoid the transformation if it is not required or potentially useful,
6147 as it might entail an increase of the field's alignment and have ripple
6148 effects on the outer record type. A typical case is a field known to be
6149 byte aligned and not to share a byte with another field.
6151 Besides, we don't even look the possibility of a transformation in cases
6152 known to be in error already, for instance when an invalid size results
6153 from a component clause. */
6155 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6156 && TYPE_MODE (gnu_field_type) == BLKmode
6157 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6160 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6161 || Present (Component_Clause (gnat_field))))))
6163 /* See what the alternate type and size would be. */
6164 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6166 bool has_byte_aligned_clause
6167 = Present (Component_Clause (gnat_field))
6168 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6169 % BITS_PER_UNIT == 0);
6171 /* Compute whether we should avoid the substitution. */
6173 /* There is no point substituting if there is no change... */
6174 = (gnu_packable_type == gnu_field_type)
6175 /* ... nor when the field is known to be byte aligned and not to
6176 share a byte with another field. */
6177 || (has_byte_aligned_clause
6178 && value_factor_p (gnu_size, BITS_PER_UNIT))
6179 /* The size of an aliased field must be an exact multiple of the
6180 type's alignment, which the substitution might increase. Reject
6181 substitutions that would so invalidate a component clause when the
6182 specified position is byte aligned, as the change would have no
6183 real benefit from the packing standpoint anyway. */
6184 || (Is_Aliased (gnat_field)
6185 && has_byte_aligned_clause
6186 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6188 /* Substitute unless told otherwise. */
6191 gnu_field_type = gnu_packable_type;
6194 gnu_size = rm_size (gnu_field_type);
6198 /* If we are packing the record and the field is BLKmode, round the
6199 size up to a byte boundary. */
6200 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6201 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6203 if (Present (Component_Clause (gnat_field)))
6205 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6206 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6207 gnat_field, FIELD_DECL, false, true);
6209 /* Ensure the position does not overlap with the parent subtype,
6211 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6214 = gnat_to_gnu_type (Parent_Subtype
6215 (Underlying_Type (Scope (gnat_field))));
6217 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6218 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6221 ("offset of& must be beyond parent{, minimum allowed is ^}",
6222 First_Bit (Component_Clause (gnat_field)), gnat_field,
6223 TYPE_SIZE_UNIT (gnu_parent));
6227 /* If this field needs strict alignment, ensure the record is
6228 sufficiently aligned and that that position and size are
6229 consistent with the alignment. */
6230 if (needs_strict_alignment)
6232 TYPE_ALIGN (gnu_record_type)
6233 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6236 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6238 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6240 ("atomic field& must be natural size of type{ (^)}",
6241 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6242 TYPE_SIZE (gnu_field_type));
6244 else if (Is_Aliased (gnat_field))
6246 ("size of aliased field& must be ^ bits",
6247 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6248 TYPE_SIZE (gnu_field_type));
6250 else if (Strict_Alignment (Etype (gnat_field)))
6252 ("size of & with aliased or tagged components not ^ bits",
6253 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6254 TYPE_SIZE (gnu_field_type));
6256 gnu_size = NULL_TREE;
6259 if (!integer_zerop (size_binop
6260 (TRUNC_MOD_EXPR, gnu_pos,
6261 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6263 if (Is_Aliased (gnat_field))
6265 ("position of aliased field& must be multiple of ^ bits",
6266 First_Bit (Component_Clause (gnat_field)), gnat_field,
6267 TYPE_ALIGN (gnu_field_type));
6269 else if (Treat_As_Volatile (gnat_field))
6271 ("position of volatile field& must be multiple of ^ bits",
6272 First_Bit (Component_Clause (gnat_field)), gnat_field,
6273 TYPE_ALIGN (gnu_field_type));
6275 else if (Strict_Alignment (Etype (gnat_field)))
6277 ("position of & with aliased or tagged components not multiple of ^ bits",
6278 First_Bit (Component_Clause (gnat_field)), gnat_field,
6279 TYPE_ALIGN (gnu_field_type));
6284 gnu_pos = NULL_TREE;
6288 if (Is_Atomic (gnat_field))
6289 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6292 /* If the record has rep clauses and this is the tag field, make a rep
6293 clause for it as well. */
6294 else if (Has_Specified_Layout (Scope (gnat_field))
6295 && Chars (gnat_field) == Name_uTag)
6297 gnu_pos = bitsize_zero_node;
6298 gnu_size = TYPE_SIZE (gnu_field_type);
6302 gnu_pos = NULL_TREE;
6304 /* We need to make the size the maximum for the type if it is
6305 self-referential and an unconstrained type. In that case, we can't
6306 pack the field since we can't make a copy to align it. */
6307 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6309 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6310 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6312 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6316 /* If a size is specified, adjust the field's type to it. */
6319 /* If the field's type is justified modular, we would need to remove
6320 the wrapper to (better) meet the layout requirements. However we
6321 can do so only if the field is not aliased to preserve the unique
6322 layout and if the prescribed size is not greater than that of the
6323 packed array to preserve the justification. */
6324 if (!needs_strict_alignment
6325 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6326 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6327 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6329 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6332 = make_type_from_size (gnu_field_type, gnu_size,
6333 Has_Biased_Representation (gnat_field));
6334 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6335 "PAD", false, definition, true);
6338 /* Otherwise (or if there was an error), don't specify a position. */
6340 gnu_pos = NULL_TREE;
6342 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6343 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6345 /* Now create the decl for the field. */
6346 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6347 packed, gnu_size, gnu_pos,
6348 Is_Aliased (gnat_field));
6349 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6350 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6352 if (Ekind (gnat_field) == E_Discriminant)
6353 DECL_DISCRIMINANT_NUMBER (gnu_field)
6354 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6359 /* Return true if TYPE is a type with variable size, a padding type with a
6360 field of variable size or is a record that has a field such a field. */
6363 is_variable_size (tree type)
6367 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6370 if (TREE_CODE (type) == RECORD_TYPE
6371 && TYPE_IS_PADDING_P (type)
6372 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6375 if (TREE_CODE (type) != RECORD_TYPE
6376 && TREE_CODE (type) != UNION_TYPE
6377 && TREE_CODE (type) != QUAL_UNION_TYPE)
6380 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6381 if (is_variable_size (TREE_TYPE (field)))
6387 /* qsort comparer for the bit positions of two record components. */
6390 compare_field_bitpos (const PTR rt1, const PTR rt2)
6392 const_tree const field1 = * (const_tree const *) rt1;
6393 const_tree const field2 = * (const_tree const *) rt2;
6395 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6397 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6400 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
6401 of GCC trees for fields that are in the record and have already been
6402 processed. When called from gnat_to_gnu_entity during the processing of a
6403 record type definition, the GCC nodes for the discriminants will be on
6404 the chain. The other calls to this function are recursive calls from
6405 itself for the Component_List of a variant and the chain is empty.
6407 PACKED is 1 if this is for a packed record, -1 if this is for a record
6408 with Component_Alignment of Storage_Unit, -2 if this is for a record
6409 with a specified alignment.
6411 DEFINITION is true if we are defining this record.
6413 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6414 with a rep clause is to be added. If it is nonzero, that is all that
6415 should be done with such fields.
6417 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6418 laying out the record. This means the alignment only serves to force fields
6419 to be bitfields, but not require the record to be that aligned. This is
6422 ALL_REP, if true, means a rep clause was found for all the fields. This
6423 simplifies the logic since we know we're not in the mixed case.
6425 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6426 modified afterwards so it will not be sent to the back-end for finalization.
6428 UNCHECKED_UNION, if true, means that we are building a type for a record
6429 with a Pragma Unchecked_Union.
6431 The processing of the component list fills in the chain with all of the
6432 fields of the record and then the record type is finished. */
6435 components_to_record (tree gnu_record_type, Node_Id component_list,
6436 tree gnu_field_list, int packed, bool definition,
6437 tree *p_gnu_rep_list, bool cancel_alignment,
6438 bool all_rep, bool do_not_finalize, bool unchecked_union)
6440 Node_Id component_decl;
6441 Entity_Id gnat_field;
6442 Node_Id variant_part;
6443 tree gnu_our_rep_list = NULL_TREE;
6444 tree gnu_field, gnu_last;
6445 bool layout_with_rep = false;
6446 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6448 /* For each variable within each component declaration create a GCC field
6449 and add it to the list, skipping any pragmas in the list. */
6450 if (Present (Component_Items (component_list)))
6451 for (component_decl = First_Non_Pragma (Component_Items (component_list));
6452 Present (component_decl);
6453 component_decl = Next_Non_Pragma (component_decl))
6455 gnat_field = Defining_Entity (component_decl);
6457 if (Chars (gnat_field) == Name_uParent)
6458 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
6461 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6462 packed, definition);
6464 /* If this is the _Tag field, put it before any discriminants,
6465 instead of after them as is the case for all other fields. */
6466 if (Chars (gnat_field) == Name_uTag)
6467 gnu_field_list = chainon (gnu_field_list, gnu_field);
6470 TREE_CHAIN (gnu_field) = gnu_field_list;
6471 gnu_field_list = gnu_field;
6475 save_gnu_tree (gnat_field, gnu_field, false);
6478 /* At the end of the component list there may be a variant part. */
6479 variant_part = Variant_Part (component_list);
6481 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6482 mutually exclusive and should go in the same memory. To do this we need
6483 to treat each variant as a record whose elements are created from the
6484 component list for the variant. So here we create the records from the
6485 lists for the variants and put them all into the QUAL_UNION_TYPE.
6486 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6487 use GNU_RECORD_TYPE if there are no fields so far. */
6488 if (Present (variant_part))
6490 tree gnu_discriminant = gnat_to_gnu (Name (variant_part));
6492 tree gnu_name = TYPE_NAME (gnu_record_type);
6494 = concat_id_with_name (get_identifier (Get_Name_String
6495 (Chars (Name (variant_part)))),
6497 tree gnu_union_type;
6498 tree gnu_union_name;
6499 tree gnu_union_field;
6500 tree gnu_variant_list = NULL_TREE;
6502 if (TREE_CODE (gnu_name) == TYPE_DECL)
6503 gnu_name = DECL_NAME (gnu_name);
6505 gnu_union_name = concat_id_with_name (gnu_name,
6506 IDENTIFIER_POINTER (gnu_var_name));
6508 /* Reuse an enclosing union if all fields are in the variant part
6509 and there is no representation clause on the record, to match
6510 the layout of C unions. There is an associated check below. */
6512 && TREE_CODE (gnu_record_type) == UNION_TYPE
6513 && !TYPE_PACKED (gnu_record_type))
6514 gnu_union_type = gnu_record_type;
6518 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6520 TYPE_NAME (gnu_union_type) = gnu_union_name;
6521 TYPE_ALIGN (gnu_union_type) = 0;
6522 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6525 for (variant = First_Non_Pragma (Variants (variant_part));
6527 variant = Next_Non_Pragma (variant))
6529 tree gnu_variant_type = make_node (RECORD_TYPE);
6530 tree gnu_inner_name;
6533 Get_Variant_Encoding (variant);
6534 gnu_inner_name = get_identifier (Name_Buffer);
6535 TYPE_NAME (gnu_variant_type)
6536 = concat_id_with_name (gnu_union_name,
6537 IDENTIFIER_POINTER (gnu_inner_name));
6539 /* Set the alignment of the inner type in case we need to make
6540 inner objects into bitfields, but then clear it out
6541 so the record actually gets only the alignment required. */
6542 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6543 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6545 /* Similarly, if the outer record has a size specified and all fields
6546 have record rep clauses, we can propagate the size into the
6548 if (all_rep_and_size)
6550 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6551 TYPE_SIZE_UNIT (gnu_variant_type)
6552 = TYPE_SIZE_UNIT (gnu_record_type);
6555 /* Create the record type for the variant. Note that we defer
6556 finalizing it until after we are sure to actually use it. */
6557 components_to_record (gnu_variant_type, Component_List (variant),
6558 NULL_TREE, packed, definition,
6559 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6560 true, unchecked_union);
6562 gnu_qual = choices_to_gnu (gnu_discriminant,
6563 Discrete_Choices (variant));
6565 Set_Present_Expr (variant, annotate_value (gnu_qual));
6567 /* If this is an Unchecked_Union and we have exactly one field,
6568 use this field directly to match the layout of C unions. */
6570 && TYPE_FIELDS (gnu_variant_type)
6571 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6572 gnu_field = TYPE_FIELDS (gnu_variant_type);
6575 /* Deal with packedness like in gnat_to_gnu_field. */
6577 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6579 /* Finalize the record type now. We used to throw away
6580 empty records but we no longer do that because we need
6581 them to generate complete debug info for the variant;
6582 otherwise, the union type definition will be lacking
6583 the fields associated with these empty variants. */
6584 rest_of_record_type_compilation (gnu_variant_type);
6586 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6587 gnu_union_type, field_packed,
6589 ? TYPE_SIZE (gnu_variant_type)
6592 ? bitsize_zero_node : 0),
6595 DECL_INTERNAL_P (gnu_field) = 1;
6597 if (!unchecked_union)
6598 DECL_QUALIFIER (gnu_field) = gnu_qual;
6601 TREE_CHAIN (gnu_field) = gnu_variant_list;
6602 gnu_variant_list = gnu_field;
6605 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
6606 if (gnu_variant_list)
6608 int union_field_packed;
6610 if (all_rep_and_size)
6612 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6613 TYPE_SIZE_UNIT (gnu_union_type)
6614 = TYPE_SIZE_UNIT (gnu_record_type);
6617 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6618 all_rep_and_size ? 1 : 0, false);
6620 /* If GNU_UNION_TYPE is our record type, it means we must have an
6621 Unchecked_Union with no fields. Verify that and, if so, just
6623 if (gnu_union_type == gnu_record_type)
6625 gcc_assert (unchecked_union
6627 && !gnu_our_rep_list);
6631 /* Deal with packedness like in gnat_to_gnu_field. */
6633 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6636 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6638 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6639 all_rep ? bitsize_zero_node : 0, 0);
6641 DECL_INTERNAL_P (gnu_union_field) = 1;
6642 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6643 gnu_field_list = gnu_union_field;
6647 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6648 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
6649 in a separate pass since we want to handle the discriminants but can't
6650 play with them until we've used them in debugging data above.
6652 ??? Note: if we then reorder them, debugging information will be wrong,
6653 but there's nothing that can be done about this at the moment. */
6654 for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; )
6656 if (DECL_FIELD_OFFSET (gnu_field))
6658 tree gnu_next = TREE_CHAIN (gnu_field);
6661 gnu_field_list = gnu_next;
6663 TREE_CHAIN (gnu_last) = gnu_next;
6665 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6666 gnu_our_rep_list = gnu_field;
6667 gnu_field = gnu_next;
6671 gnu_last = gnu_field;
6672 gnu_field = TREE_CHAIN (gnu_field);
6676 /* If we have any items in our rep'ed field list, it is not the case that all
6677 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
6678 set it and ignore the items. */
6679 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6680 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6681 else if (gnu_our_rep_list)
6683 /* Otherwise, sort the fields by bit position and put them into their
6684 own record if we have any fields without rep clauses. */
6686 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6687 int len = list_length (gnu_our_rep_list);
6688 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6691 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
6692 gnu_field = TREE_CHAIN (gnu_field), i++)
6693 gnu_arr[i] = gnu_field;
6695 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6697 /* Put the fields in the list in order of increasing position, which
6698 means we start from the end. */
6699 gnu_our_rep_list = NULL_TREE;
6700 for (i = len - 1; i >= 0; i--)
6702 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6703 gnu_our_rep_list = gnu_arr[i];
6704 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
6709 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
6710 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
6711 gnu_record_type, 0, 0, 0, 1);
6712 DECL_INTERNAL_P (gnu_field) = 1;
6713 gnu_field_list = chainon (gnu_field_list, gnu_field);
6717 layout_with_rep = true;
6718 gnu_field_list = nreverse (gnu_our_rep_list);
6722 if (cancel_alignment)
6723 TYPE_ALIGN (gnu_record_type) = 0;
6725 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
6726 layout_with_rep ? 1 : 0, do_not_finalize);
6729 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
6730 placed into an Esize, Component_Bit_Offset, or Component_Size value
6731 in the GNAT tree. */
6734 annotate_value (tree gnu_size)
6736 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
6738 Node_Ref_Or_Val ops[3], ret;
6741 struct tree_int_map **h = NULL;
6743 /* See if we've already saved the value for this node. */
6744 if (EXPR_P (gnu_size))
6746 struct tree_int_map in;
6747 if (!annotate_value_cache)
6748 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
6749 tree_int_map_eq, 0);
6750 in.base.from = gnu_size;
6751 h = (struct tree_int_map **)
6752 htab_find_slot (annotate_value_cache, &in, INSERT);
6755 return (Node_Ref_Or_Val) (*h)->to;
6758 /* If we do not return inside this switch, TCODE will be set to the
6759 code to use for a Create_Node operand and LEN (set above) will be
6760 the number of recursive calls for us to make. */
6762 switch (TREE_CODE (gnu_size))
6765 if (TREE_OVERFLOW (gnu_size))
6768 /* This may have come from a conversion from some smaller type,
6769 so ensure this is in bitsizetype. */
6770 gnu_size = convert (bitsizetype, gnu_size);
6772 /* For negative values, use NEGATE_EXPR of the supplied value. */
6773 if (tree_int_cst_sgn (gnu_size) < 0)
6775 /* The ridiculous code below is to handle the case of the largest
6776 negative integer. */
6777 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
6778 bool adjust = false;
6781 if (TREE_OVERFLOW (negative_size))
6784 = size_binop (MINUS_EXPR, bitsize_zero_node,
6785 size_binop (PLUS_EXPR, gnu_size,
6790 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
6792 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
6794 return annotate_value (temp);
6797 if (!host_integerp (gnu_size, 1))
6800 size = tree_low_cst (gnu_size, 1);
6802 /* This peculiar test is to make sure that the size fits in an int
6803 on machines where HOST_WIDE_INT is not "int". */
6804 if (tree_low_cst (gnu_size, 1) == size)
6805 return UI_From_Int (size);
6810 /* The only case we handle here is a simple discriminant reference. */
6811 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
6812 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
6813 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
6814 return Create_Node (Discrim_Val,
6815 annotate_value (DECL_DISCRIMINANT_NUMBER
6816 (TREE_OPERAND (gnu_size, 1))),
6821 CASE_CONVERT: case NON_LVALUE_EXPR:
6822 return annotate_value (TREE_OPERAND (gnu_size, 0));
6824 /* Now just list the operations we handle. */
6825 case COND_EXPR: tcode = Cond_Expr; break;
6826 case PLUS_EXPR: tcode = Plus_Expr; break;
6827 case MINUS_EXPR: tcode = Minus_Expr; break;
6828 case MULT_EXPR: tcode = Mult_Expr; break;
6829 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
6830 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
6831 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
6832 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
6833 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
6834 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
6835 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
6836 case NEGATE_EXPR: tcode = Negate_Expr; break;
6837 case MIN_EXPR: tcode = Min_Expr; break;
6838 case MAX_EXPR: tcode = Max_Expr; break;
6839 case ABS_EXPR: tcode = Abs_Expr; break;
6840 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
6841 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
6842 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
6843 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
6844 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
6845 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
6846 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
6847 case LT_EXPR: tcode = Lt_Expr; break;
6848 case LE_EXPR: tcode = Le_Expr; break;
6849 case GT_EXPR: tcode = Gt_Expr; break;
6850 case GE_EXPR: tcode = Ge_Expr; break;
6851 case EQ_EXPR: tcode = Eq_Expr; break;
6852 case NE_EXPR: tcode = Ne_Expr; break;
6858 /* Now get each of the operands that's relevant for this code. If any
6859 cannot be expressed as a repinfo node, say we can't. */
6860 for (i = 0; i < 3; i++)
6863 for (i = 0; i < len; i++)
6865 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
6866 if (ops[i] == No_Uint)
6870 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
6872 /* Save the result in the cache. */
6875 *h = GGC_NEW (struct tree_int_map);
6876 (*h)->base.from = gnu_size;
6883 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
6884 GCC type, set Component_Bit_Offset and Esize to the position and size
6888 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
6892 Entity_Id gnat_field;
6894 /* We operate by first making a list of all fields and their positions
6895 (we can get the sizes easily at any time) by a recursive call
6896 and then update all the sizes into the tree. */
6897 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
6898 size_zero_node, bitsize_zero_node,
6901 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
6902 gnat_field = Next_Entity (gnat_field))
6903 if ((Ekind (gnat_field) == E_Component
6904 || (Ekind (gnat_field) == E_Discriminant
6905 && !Is_Unchecked_Union (Scope (gnat_field)))))
6907 tree parent_offset = bitsize_zero_node;
6909 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
6914 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
6916 /* In this mode the tag and parent components have not been
6917 generated, so we add the appropriate offset to each
6918 component. For a component appearing in the current
6919 extension, the offset is the size of the parent. */
6920 if (Is_Derived_Type (gnat_entity)
6921 && Original_Record_Component (gnat_field) == gnat_field)
6923 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
6926 parent_offset = bitsize_int (POINTER_SIZE);
6929 Set_Component_Bit_Offset
6932 (size_binop (PLUS_EXPR,
6933 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
6934 TREE_VALUE (TREE_VALUE
6935 (TREE_VALUE (gnu_entry)))),
6938 Set_Esize (gnat_field,
6939 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
6941 else if (Is_Tagged_Type (gnat_entity)
6942 && Is_Derived_Type (gnat_entity))
6944 /* If there is no gnu_entry, this is an inherited component whose
6945 position is the same as in the parent type. */
6946 Set_Component_Bit_Offset
6948 Component_Bit_Offset (Original_Record_Component (gnat_field)));
6949 Set_Esize (gnat_field,
6950 Esize (Original_Record_Component (gnat_field)));
6955 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
6956 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
6957 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
6958 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
6959 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
6960 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
6964 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
6965 tree gnu_bitpos, unsigned int offset_align)
6968 tree gnu_result = gnu_list;
6970 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
6971 gnu_field = TREE_CHAIN (gnu_field))
6973 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
6974 DECL_FIELD_BIT_OFFSET (gnu_field));
6975 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
6976 DECL_FIELD_OFFSET (gnu_field));
6977 unsigned int our_offset_align
6978 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
6981 = tree_cons (gnu_field,
6982 tree_cons (gnu_our_offset,
6983 tree_cons (size_int (our_offset_align),
6984 gnu_our_bitpos, NULL_TREE),
6988 if (DECL_INTERNAL_P (gnu_field))
6990 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
6991 gnu_our_offset, gnu_our_bitpos,
6998 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
6999 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7000 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7001 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7002 for the size of a field. COMPONENT_P is true if we are being called
7003 to process the Component_Size of GNAT_OBJECT. This is used for error
7004 message handling and to indicate to use the object size of GNU_TYPE.
7005 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7006 it means that a size of zero should be treated as an unspecified size. */
7009 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7010 enum tree_code kind, bool component_p, bool zero_ok)
7012 Node_Id gnat_error_node;
7013 tree type_size, size;
7015 if (kind == VAR_DECL
7016 /* If a type needs strict alignment, a component of this type in
7017 a packed record cannot be packed and thus uses the type size. */
7018 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7019 type_size = TYPE_SIZE (gnu_type);
7021 type_size = rm_size (gnu_type);
7023 /* Find the node to use for errors. */
7024 if ((Ekind (gnat_object) == E_Component
7025 || Ekind (gnat_object) == E_Discriminant)
7026 && Present (Component_Clause (gnat_object)))
7027 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7028 else if (Present (Size_Clause (gnat_object)))
7029 gnat_error_node = Expression (Size_Clause (gnat_object));
7031 gnat_error_node = gnat_object;
7033 /* Return 0 if no size was specified, either because Esize was not Present or
7034 the specified size was zero. */
7035 if (No (uint_size) || uint_size == No_Uint)
7038 /* Get the size as a tree. Give an error if a size was specified, but cannot
7039 be represented as in sizetype. */
7040 size = UI_To_gnu (uint_size, bitsizetype);
7041 if (TREE_OVERFLOW (size))
7043 post_error_ne (component_p ? "component size of & is too large"
7044 : "size of & is too large",
7045 gnat_error_node, gnat_object);
7049 /* Ignore a negative size since that corresponds to our back-annotation.
7050 Also ignore a zero size unless a size clause exists. */
7051 else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7054 /* The size of objects is always a multiple of a byte. */
7055 if (kind == VAR_DECL
7056 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7059 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7060 gnat_error_node, gnat_object);
7062 post_error_ne ("size for& is not a multiple of Storage_Unit",
7063 gnat_error_node, gnat_object);
7067 /* If this is an integral type or a packed array type, the front-end has
7068 verified the size, so we need not do it here (which would entail
7069 checking against the bounds). However, if this is an aliased object, it
7070 may not be smaller than the type of the object. */
7071 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7072 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7075 /* If the object is a record that contains a template, add the size of
7076 the template to the specified size. */
7077 if (TREE_CODE (gnu_type) == RECORD_TYPE
7078 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7079 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7081 /* Modify the size of the type to be that of the maximum size if it has a
7083 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7084 type_size = max_size (type_size, true);
7086 /* If this is an access type or a fat pointer, the minimum size is that given
7087 by the smallest integral mode that's valid for pointers. */
7088 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7090 enum machine_mode p_mode;
7092 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7093 !targetm.valid_pointer_mode (p_mode);
7094 p_mode = GET_MODE_WIDER_MODE (p_mode))
7097 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7100 /* If the size of the object is a constant, the new size must not be
7102 if (TREE_CODE (type_size) != INTEGER_CST
7103 || TREE_OVERFLOW (type_size)
7104 || tree_int_cst_lt (size, type_size))
7108 ("component size for& too small{, minimum allowed is ^}",
7109 gnat_error_node, gnat_object, type_size);
7111 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7112 gnat_error_node, gnat_object, type_size);
7114 if (kind == VAR_DECL && !component_p
7115 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7116 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7117 post_error_ne_tree_2
7118 ("\\size of ^ is not a multiple of alignment (^ bits)",
7119 gnat_error_node, gnat_object, rm_size (gnu_type),
7120 TYPE_ALIGN (gnu_type));
7122 else if (INTEGRAL_TYPE_P (gnu_type))
7123 post_error_ne ("\\size would be legal if & were not aliased!",
7124 gnat_error_node, gnat_object);
7132 /* Similarly, but both validate and process a value of RM_Size. This
7133 routine is only called for types. */
7136 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7138 /* Only give an error if a Value_Size clause was explicitly given.
7139 Otherwise, we'd be duplicating an error on the Size clause. */
7140 Node_Id gnat_attr_node
7141 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7142 tree old_size = rm_size (gnu_type);
7145 /* Get the size as a tree. Do nothing if none was specified, either
7146 because RM_Size was not Present or if the specified size was zero.
7147 Give an error if a size was specified, but cannot be represented as
7149 if (No (uint_size) || uint_size == No_Uint)
7152 size = UI_To_gnu (uint_size, bitsizetype);
7153 if (TREE_OVERFLOW (size))
7155 if (Present (gnat_attr_node))
7156 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7162 /* Ignore a negative size since that corresponds to our back-annotation.
7163 Also ignore a zero size unless a size clause exists, a Value_Size
7164 clause exists, or this is an integer type, in which case the
7165 front end will have always set it. */
7166 else if (tree_int_cst_sgn (size) < 0
7167 || (integer_zerop (size) && No (gnat_attr_node)
7168 && !Has_Size_Clause (gnat_entity)
7169 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7172 /* If the old size is self-referential, get the maximum size. */
7173 if (CONTAINS_PLACEHOLDER_P (old_size))
7174 old_size = max_size (old_size, true);
7176 /* If the size of the object is a constant, the new size must not be
7177 smaller (the front end checks this for scalar types). */
7178 if (TREE_CODE (old_size) != INTEGER_CST
7179 || TREE_OVERFLOW (old_size)
7180 || (AGGREGATE_TYPE_P (gnu_type)
7181 && tree_int_cst_lt (size, old_size)))
7183 if (Present (gnat_attr_node))
7185 ("Value_Size for& too small{, minimum allowed is ^}",
7186 gnat_attr_node, gnat_entity, old_size);
7191 /* Otherwise, set the RM_Size. */
7192 if (TREE_CODE (gnu_type) == INTEGER_TYPE
7193 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7194 TYPE_RM_SIZE_NUM (gnu_type) = size;
7195 else if (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7196 || TREE_CODE (gnu_type) == BOOLEAN_TYPE)
7197 TYPE_RM_SIZE_NUM (gnu_type) = size;
7198 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7199 || TREE_CODE (gnu_type) == UNION_TYPE
7200 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7201 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7202 SET_TYPE_ADA_SIZE (gnu_type, size);
7205 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7206 If TYPE is the best type, return it. Otherwise, make a new type. We
7207 only support new integral and pointer types. FOR_BIASED is nonzero if
7208 we are making a biased type. */
7211 make_type_from_size (tree type, tree size_tree, bool for_biased)
7213 unsigned HOST_WIDE_INT size;
7217 /* If size indicates an error, just return TYPE to avoid propagating
7218 the error. Likewise if it's too large to represent. */
7219 if (!size_tree || !host_integerp (size_tree, 1))
7222 size = tree_low_cst (size_tree, 1);
7224 switch (TREE_CODE (type))
7229 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7230 && TYPE_BIASED_REPRESENTATION_P (type));
7232 /* Only do something if the type is not a packed array type and
7233 doesn't already have the proper size. */
7234 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7235 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7238 biased_p |= for_biased;
7239 size = MIN (size, LONG_LONG_TYPE_SIZE);
7241 if (TYPE_UNSIGNED (type) || biased_p)
7242 new_type = make_unsigned_type (size);
7244 new_type = make_signed_type (size);
7245 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7246 TYPE_MIN_VALUE (new_type)
7247 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
7248 TYPE_MAX_VALUE (new_type)
7249 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
7250 /* Propagate the name to avoid creating a fake subrange type. */
7251 if (TYPE_NAME (type))
7253 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7254 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7256 TYPE_NAME (new_type) = TYPE_NAME (type);
7258 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7259 TYPE_RM_SIZE_NUM (new_type) = bitsize_int (size);
7263 /* Do something if this is a fat pointer, in which case we
7264 may need to return the thin pointer. */
7265 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7267 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7268 if (!targetm.valid_pointer_mode (p_mode))
7271 build_pointer_type_for_mode
7272 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7278 /* Only do something if this is a thin pointer, in which case we
7279 may need to return the fat pointer. */
7280 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7282 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7292 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7293 a type or object whose present alignment is ALIGN. If this alignment is
7294 valid, return it. Otherwise, give an error and return ALIGN. */
7297 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7299 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7300 unsigned int new_align;
7301 Node_Id gnat_error_node;
7303 /* Don't worry about checking alignment if alignment was not specified
7304 by the source program and we already posted an error for this entity. */
7305 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7308 /* Post the error on the alignment clause if any. */
7309 if (Present (Alignment_Clause (gnat_entity)))
7310 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7312 gnat_error_node = gnat_entity;
7314 /* Within GCC, an alignment is an integer, so we must make sure a value is
7315 specified that fits in that range. Also, there is an upper bound to
7316 alignments we can support/allow. */
7317 if (!UI_Is_In_Int_Range (alignment)
7318 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7319 post_error_ne_num ("largest supported alignment for& is ^",
7320 gnat_error_node, gnat_entity, max_allowed_alignment);
7321 else if (!(Present (Alignment_Clause (gnat_entity))
7322 && From_At_Mod (Alignment_Clause (gnat_entity)))
7323 && new_align * BITS_PER_UNIT < align)
7324 post_error_ne_num ("alignment for& must be at least ^",
7325 gnat_error_node, gnat_entity,
7326 align / BITS_PER_UNIT);
7329 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7330 if (new_align > align)
7337 /* Return the smallest alignment not less than SIZE. */
7340 ceil_alignment (unsigned HOST_WIDE_INT size)
7342 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7345 /* Verify that OBJECT, a type or decl, is something we can implement
7346 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7347 if we require atomic components. */
7350 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7352 Node_Id gnat_error_point = gnat_entity;
7354 enum machine_mode mode;
7358 /* There are three case of what OBJECT can be. It can be a type, in which
7359 case we take the size, alignment and mode from the type. It can be a
7360 declaration that was indirect, in which case the relevant values are
7361 that of the type being pointed to, or it can be a normal declaration,
7362 in which case the values are of the decl. The code below assumes that
7363 OBJECT is either a type or a decl. */
7364 if (TYPE_P (object))
7366 mode = TYPE_MODE (object);
7367 align = TYPE_ALIGN (object);
7368 size = TYPE_SIZE (object);
7370 else if (DECL_BY_REF_P (object))
7372 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7373 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7374 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7378 mode = DECL_MODE (object);
7379 align = DECL_ALIGN (object);
7380 size = DECL_SIZE (object);
7383 /* Consider all floating-point types atomic and any types that that are
7384 represented by integers no wider than a machine word. */
7385 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7386 || ((GET_MODE_CLASS (mode) == MODE_INT
7387 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7388 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7391 /* For the moment, also allow anything that has an alignment equal
7392 to its size and which is smaller than a word. */
7393 if (size && TREE_CODE (size) == INTEGER_CST
7394 && compare_tree_int (size, align) == 0
7395 && align <= BITS_PER_WORD)
7398 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7399 gnat_node = Next_Rep_Item (gnat_node))
7401 if (!comp_p && Nkind (gnat_node) == N_Pragma
7402 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7404 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7405 else if (comp_p && Nkind (gnat_node) == N_Pragma
7406 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7407 == Pragma_Atomic_Components))
7408 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7412 post_error_ne ("atomic access to component of & cannot be guaranteed",
7413 gnat_error_point, gnat_entity);
7415 post_error_ne ("atomic access to & cannot be guaranteed",
7416 gnat_error_point, gnat_entity);
7419 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7420 have compatible signatures so that a call using one type may be safely
7421 issued if the actual target function type is the other. Return 1 if it is
7422 the case, 0 otherwise, and post errors on the incompatibilities.
7424 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7425 that calls to the subprogram will have arguments suitable for the later
7426 underlying builtin expansion. */
7429 compatible_signatures_p (tree ftype1, tree ftype2)
7431 /* As of now, we only perform very trivial tests and consider it's the
7432 programmer's responsibility to ensure the type correctness in the Ada
7433 declaration, as in the regular Import cases.
7435 Mismatches typically result in either error messages from the builtin
7436 expander, internal compiler errors, or in a real call sequence. This
7437 should be refined to issue diagnostics helping error detection and
7440 /* Almost fake test, ensuring a use of each argument. */
7441 if (ftype1 == ftype2)
7447 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a new
7448 type with all size expressions that contain F updated by replacing F
7449 with R. If F is NULL_TREE, always make a new RECORD_TYPE, even if
7450 nothing has changed. */
7453 substitute_in_type (tree t, tree f, tree r)
7458 switch (TREE_CODE (t))
7463 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7464 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7466 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7467 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7469 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7472 new = build_range_type (TREE_TYPE (t), low, high);
7473 if (TYPE_INDEX_TYPE (t))
7475 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7482 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7483 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7485 tree low = NULL_TREE, high = NULL_TREE;
7487 if (TYPE_MIN_VALUE (t))
7488 low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7489 if (TYPE_MAX_VALUE (t))
7490 high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7492 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7496 TYPE_MIN_VALUE (t) = low;
7497 TYPE_MAX_VALUE (t) = high;
7502 tem = substitute_in_type (TREE_TYPE (t), f, r);
7503 if (tem == TREE_TYPE (t))
7506 return build_complex_type (tem);
7512 /* Don't know how to do these yet. */
7517 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7518 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7520 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7523 new = build_array_type (component, domain);
7524 TYPE_SIZE (new) = 0;
7525 TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t);
7526 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7527 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7529 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7530 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7532 /* If we had bounded the sizes of T by a constant, bound the sizes of
7533 NEW by the same constant. */
7534 if (TREE_CODE (TYPE_SIZE (t)) == MIN_EXPR)
7536 = size_binop (MIN_EXPR, TREE_OPERAND (TYPE_SIZE (t), 1),
7538 if (TREE_CODE (TYPE_SIZE_UNIT (t)) == MIN_EXPR)
7539 TYPE_SIZE_UNIT (new)
7540 = size_binop (MIN_EXPR, TREE_OPERAND (TYPE_SIZE_UNIT (t), 1),
7541 TYPE_SIZE_UNIT (new));
7547 case QUAL_UNION_TYPE:
7551 = (f == NULL_TREE && !TREE_CONSTANT (TYPE_SIZE (t)));
7552 bool field_has_rep = false;
7553 tree last_field = NULL_TREE;
7555 tree new = copy_type (t);
7557 /* Start out with no fields, make new fields, and chain them
7558 in. If we haven't actually changed the type of any field,
7559 discard everything we've done and return the old type. */
7561 TYPE_FIELDS (new) = NULL_TREE;
7562 TYPE_SIZE (new) = NULL_TREE;
7564 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7566 tree new_field = copy_node (field);
7568 TREE_TYPE (new_field)
7569 = substitute_in_type (TREE_TYPE (new_field), f, r);
7571 if (DECL_HAS_REP_P (field) && !DECL_INTERNAL_P (field))
7572 field_has_rep = true;
7573 else if (TREE_TYPE (new_field) != TREE_TYPE (field))
7574 changed_field = true;
7576 /* If this is an internal field and the type of this field is
7577 a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If
7578 the type just has one element, treat that as the field.
7579 But don't do this if we are processing a QUAL_UNION_TYPE. */
7580 if (TREE_CODE (t) != QUAL_UNION_TYPE
7581 && DECL_INTERNAL_P (new_field)
7582 && (TREE_CODE (TREE_TYPE (new_field)) == UNION_TYPE
7583 || TREE_CODE (TREE_TYPE (new_field)) == RECORD_TYPE))
7585 if (!TYPE_FIELDS (TREE_TYPE (new_field)))
7588 if (!TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field))))
7591 = copy_node (TYPE_FIELDS (TREE_TYPE (new_field)));
7593 /* Make sure omitting the union doesn't change
7595 DECL_ALIGN (next_new_field) = DECL_ALIGN (new_field);
7596 new_field = next_new_field;
7600 DECL_CONTEXT (new_field) = new;
7601 SET_DECL_ORIGINAL_FIELD (new_field,
7602 (DECL_ORIGINAL_FIELD (field)
7603 ? DECL_ORIGINAL_FIELD (field) : field));
7605 /* If the size of the old field was set at a constant,
7606 propagate the size in case the type's size was variable.
7607 (This occurs in the case of a variant or discriminated
7608 record with a default size used as a field of another
7610 DECL_SIZE (new_field)
7611 = TREE_CODE (DECL_SIZE (field)) == INTEGER_CST
7612 ? DECL_SIZE (field) : NULL_TREE;
7613 DECL_SIZE_UNIT (new_field)
7614 = TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST
7615 ? DECL_SIZE_UNIT (field) : NULL_TREE;
7617 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7619 tree new_q = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7621 if (new_q != DECL_QUALIFIER (new_field))
7622 changed_field = true;
7624 /* Do the substitution inside the qualifier and if we find
7625 that this field will not be present, omit it. */
7626 DECL_QUALIFIER (new_field) = new_q;
7628 if (integer_zerop (DECL_QUALIFIER (new_field)))
7633 TYPE_FIELDS (new) = new_field;
7635 TREE_CHAIN (last_field) = new_field;
7637 last_field = new_field;
7639 /* If this is a qualified type and this field will always be
7640 present, we are done. */
7641 if (TREE_CODE (t) == QUAL_UNION_TYPE
7642 && integer_onep (DECL_QUALIFIER (new_field)))
7646 /* If this used to be a qualified union type, but we now know what
7647 field will be present, make this a normal union. */
7648 if (changed_field && TREE_CODE (new) == QUAL_UNION_TYPE
7649 && (!TYPE_FIELDS (new)
7650 || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new)))))
7651 TREE_SET_CODE (new, UNION_TYPE);
7652 else if (!changed_field)
7655 gcc_assert (!field_has_rep);
7658 /* If the size was originally a constant use it. */
7659 if (TYPE_SIZE (t) && TREE_CODE (TYPE_SIZE (t)) == INTEGER_CST
7660 && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST)
7662 TYPE_SIZE (new) = TYPE_SIZE (t);
7663 TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t);
7664 SET_TYPE_ADA_SIZE (new, TYPE_ADA_SIZE (t));
7675 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
7676 needed to represent the object. */
7679 rm_size (tree gnu_type)
7681 /* For integer types, this is the precision. For record types, we store
7682 the size explicitly. For other types, this is just the size. */
7684 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7685 return TYPE_RM_SIZE (gnu_type);
7686 else if (TREE_CODE (gnu_type) == RECORD_TYPE
7687 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7688 /* Return the rm_size of the actual data plus the size of the template. */
7690 size_binop (PLUS_EXPR,
7691 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7692 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7693 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7694 || TREE_CODE (gnu_type) == UNION_TYPE
7695 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7696 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7697 && TYPE_ADA_SIZE (gnu_type))
7698 return TYPE_ADA_SIZE (gnu_type);
7700 return TYPE_SIZE (gnu_type);
7703 /* Return an identifier representing the external name to be used for
7704 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7705 and the specified suffix. */
7708 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7710 Entity_Kind kind = Ekind (gnat_entity);
7712 const char *str = (!suffix ? "" : suffix);
7713 String_Template temp = {1, strlen (str)};
7714 Fat_Pointer fp = {str, &temp};
7716 Get_External_Name_With_Suffix (gnat_entity, fp);
7718 /* A variable using the Stdcall convention (meaning we are running
7719 on a Windows box) live in a DLL. Here we adjust its name to use
7720 the jump-table, the _imp__NAME contains the address for the NAME
7722 if ((kind == E_Variable || kind == E_Constant)
7723 && Has_Stdcall_Convention (gnat_entity))
7725 const char *prefix = "_imp__";
7726 int k, plen = strlen (prefix);
7728 for (k = 0; k <= Name_Len; k++)
7729 Name_Buffer [Name_Len - k + plen] = Name_Buffer [Name_Len - k];
7730 strncpy (Name_Buffer, prefix, plen);
7733 return get_identifier (Name_Buffer);
7736 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7737 fully-qualified name, possibly with type information encoding.
7738 Otherwise, return the name. */
7741 get_entity_name (Entity_Id gnat_entity)
7743 Get_Encoded_Name (gnat_entity);
7744 return get_identifier (Name_Buffer);
7747 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
7748 string, return a new IDENTIFIER_NODE that is the concatenation of
7749 the name in GNU_ID and SUFFIX. */
7752 concat_id_with_name (tree gnu_id, const char *suffix)
7754 int len = IDENTIFIER_LENGTH (gnu_id);
7756 strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id), len);
7757 strncpy (Name_Buffer + len, "___", 3);
7759 strcpy (Name_Buffer + len, suffix);
7760 return get_identifier (Name_Buffer);
7763 #include "gt-ada-decl.h"