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,
492 then 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 a
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 /* Make a volatile version of this object's type if we are to make
832 the object volatile. We also interpret 13.3(19) conservatively
833 and disallow any optimizations for an object covered by it. */
834 if ((Treat_As_Volatile (gnat_entity)
835 || (Is_Exported (gnat_entity)
836 /* Exclude exported constants created by the compiler,
837 which should boil down to static dispatch tables and
838 make it possible to put them in read-only memory. */
839 && (Comes_From_Source (gnat_entity) || !const_flag))
840 || Is_Imported (gnat_entity)
841 || Present (Address_Clause (gnat_entity)))
842 && !TYPE_VOLATILE (gnu_type))
843 gnu_type = build_qualified_type (gnu_type,
844 (TYPE_QUALS (gnu_type)
845 | TYPE_QUAL_VOLATILE));
847 /* If this is a renaming, avoid as much as possible to create a new
848 object. However, in several cases, creating it is required.
849 This processing needs to be applied to the raw expression so
850 as to make it more likely to rename the underlying object. */
851 if (Present (Renamed_Object (gnat_entity)))
853 bool create_normal_object = false;
855 /* If the renamed object had padding, strip off the reference
856 to the inner object and reset our type. */
857 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
858 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
860 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
861 /* Strip useless conversions around the object. */
862 || TREE_CODE (gnu_expr) == NOP_EXPR)
864 gnu_expr = TREE_OPERAND (gnu_expr, 0);
865 gnu_type = TREE_TYPE (gnu_expr);
868 /* Case 1: If this is a constant renaming stemming from a function
869 call, treat it as a normal object whose initial value is what
870 is being renamed. RM 3.3 says that the result of evaluating a
871 function call is a constant object. As a consequence, it can
872 be the inner object of a constant renaming. In this case, the
873 renaming must be fully instantiated, i.e. it cannot be a mere
874 reference to (part of) an existing object. */
877 tree inner_object = gnu_expr;
878 while (handled_component_p (inner_object))
879 inner_object = TREE_OPERAND (inner_object, 0);
880 if (TREE_CODE (inner_object) == CALL_EXPR)
881 create_normal_object = true;
884 /* Otherwise, see if we can proceed with a stabilized version of
885 the renamed entity or if we need to make a new object. */
886 if (!create_normal_object)
888 tree maybe_stable_expr = NULL_TREE;
891 /* Case 2: If the renaming entity need not be materialized and
892 the renamed expression is something we can stabilize, use
893 that for the renaming. At the global level, we can only do
894 this if we know no SAVE_EXPRs need be made, because the
895 expression we return might be used in arbitrary conditional
896 branches so we must force the SAVE_EXPRs evaluation
897 immediately and this requires a function context. */
898 if (!Materialize_Entity (gnat_entity)
899 && (!global_bindings_p ()
900 || (staticp (gnu_expr)
901 && !TREE_SIDE_EFFECTS (gnu_expr))))
904 = maybe_stabilize_reference (gnu_expr, true, &stable);
908 gnu_decl = maybe_stable_expr;
909 /* ??? No DECL_EXPR is created so we need to mark
910 the expression manually lest it is shared. */
911 if (global_bindings_p ())
912 mark_visited (&gnu_decl);
913 save_gnu_tree (gnat_entity, gnu_decl, true);
918 /* The stabilization failed. Keep maybe_stable_expr
919 untouched here to let the pointer case below know
920 about that failure. */
923 /* Case 3: If this is a constant renaming and creating a
924 new object is allowed and cheap, treat it as a normal
925 object whose initial value is what is being renamed. */
926 if (const_flag && Is_Elementary_Type (Etype (gnat_entity)))
929 /* Case 4: Make this into a constant pointer to the object we
930 are to rename and attach the object to the pointer if it is
931 something we can stabilize.
933 From the proper scope, attached objects will be referenced
934 directly instead of indirectly via the pointer to avoid
935 subtle aliasing problems with non-addressable entities.
936 They have to be stable because we must not evaluate the
937 variables in the expression every time the renaming is used.
938 The pointer is called a "renaming" pointer in this case.
940 In the rare cases where we cannot stabilize the renamed
941 object, we just make a "bare" pointer, and the renamed
942 entity is always accessed indirectly through it. */
945 gnu_type = build_reference_type (gnu_type);
946 inner_const_flag = TREE_READONLY (gnu_expr);
949 /* If the previous attempt at stabilizing failed, there
950 is no point in trying again and we reuse the result
951 without attaching it to the pointer. In this case it
952 will only be used as the initializing expression of
953 the pointer and thus needs no special treatment with
954 regard to multiple evaluations. */
955 if (maybe_stable_expr)
958 /* Otherwise, try to stabilize and attach the expression
959 to the pointer if the stabilization succeeds.
961 Note that this might introduce SAVE_EXPRs and we don't
962 check whether we're at the global level or not. This
963 is fine since we are building a pointer initializer and
964 neither the pointer nor the initializing expression can
965 be accessed before the pointer elaboration has taken
966 place in a correct program.
968 These SAVE_EXPRs will be evaluated at the right place
969 by either the evaluation of the initializer for the
970 non-global case or the elaboration code for the global
971 case, and will be attached to the elaboration procedure
972 in the latter case. */
976 = maybe_stabilize_reference (gnu_expr, true, &stable);
979 renamed_obj = maybe_stable_expr;
981 /* Attaching is actually performed downstream, as soon
982 as we have a VAR_DECL for the pointer we make. */
986 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
988 gnu_size = NULL_TREE;
994 /* If this is an aliased object whose nominal subtype is unconstrained,
995 the object is a record that contains both the template and
996 the object. If there is an initializer, it will have already
997 been converted to the right type, but we need to create the
998 template if there is no initializer. */
1000 && TREE_CODE (gnu_type) == RECORD_TYPE
1001 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1002 /* Beware that padding might have been introduced
1003 via maybe_pad_type above. */
1004 || (TYPE_IS_PADDING_P (gnu_type)
1005 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1007 && TYPE_CONTAINS_TEMPLATE_P
1008 (TREE_TYPE (TYPE_FIELDS (gnu_type)))))
1012 = TYPE_IS_PADDING_P (gnu_type)
1013 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1014 : TYPE_FIELDS (gnu_type);
1017 = gnat_build_constructor
1021 build_template (TREE_TYPE (template_field),
1022 TREE_TYPE (TREE_CHAIN (template_field)),
1027 /* Convert the expression to the type of the object except in the
1028 case where the object's type is unconstrained or the object's type
1029 is a padded record whose field is of self-referential size. In
1030 the former case, converting will generate unnecessary evaluations
1031 of the CONSTRUCTOR to compute the size and in the latter case, we
1032 want to only copy the actual data. */
1034 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1035 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1036 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1037 && TYPE_IS_PADDING_P (gnu_type)
1038 && (CONTAINS_PLACEHOLDER_P
1039 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1040 gnu_expr = convert (gnu_type, gnu_expr);
1042 /* If this is a pointer and it does not have an initializing
1043 expression, initialize it to NULL, unless the object is
1046 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
1047 && !Is_Imported (gnat_entity) && !gnu_expr)
1048 gnu_expr = integer_zero_node;
1050 /* If we are defining the object and it has an Address clause, we must
1051 either get the address expression from the saved GCC tree for the
1052 object if it has a Freeze node, or elaborate the address expression
1053 here since the front-end has guaranteed that the elaboration has no
1054 effects in this case. */
1055 if (definition && Present (Address_Clause (gnat_entity)))
1058 = present_gnu_tree (gnat_entity)
1059 ? get_gnu_tree (gnat_entity)
1060 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1062 save_gnu_tree (gnat_entity, NULL_TREE, false);
1064 /* Ignore the size. It's either meaningless or was handled
1066 gnu_size = NULL_TREE;
1067 /* Convert the type of the object to a reference type that can
1068 alias everything as per 13.3(19). */
1070 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1071 gnu_address = convert (gnu_type, gnu_address);
1073 const_flag = !Is_Public (gnat_entity)
1074 || compile_time_known_address_p (Expression (Address_Clause
1077 /* If this is a deferred constant, the initializer is attached to
1079 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1082 (Expression (Declaration_Node (Full_View (gnat_entity))));
1084 /* If we don't have an initializing expression for the underlying
1085 variable, the initializing expression for the pointer is the
1086 specified address. Otherwise, we have to make a COMPOUND_EXPR
1087 to assign both the address and the initial value. */
1089 gnu_expr = gnu_address;
1092 = build2 (COMPOUND_EXPR, gnu_type,
1094 (MODIFY_EXPR, NULL_TREE,
1095 build_unary_op (INDIRECT_REF, NULL_TREE,
1101 /* If it has an address clause and we are not defining it, mark it
1102 as an indirect object. Likewise for Stdcall objects that are
1104 if ((!definition && Present (Address_Clause (gnat_entity)))
1105 || (Is_Imported (gnat_entity)
1106 && Has_Stdcall_Convention (gnat_entity)))
1108 /* Convert the type of the object to a reference type that can
1109 alias everything as per 13.3(19). */
1111 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1112 gnu_size = NULL_TREE;
1114 /* No point in taking the address of an initializing expression
1115 that isn't going to be used. */
1116 gnu_expr = NULL_TREE;
1118 /* If it has an address clause whose value is known at compile
1119 time, make the object a CONST_DECL. This will avoid a
1120 useless dereference. */
1121 if (Present (Address_Clause (gnat_entity)))
1123 Node_Id gnat_address
1124 = Expression (Address_Clause (gnat_entity));
1126 if (compile_time_known_address_p (gnat_address))
1128 gnu_expr = gnat_to_gnu (gnat_address);
1136 /* If we are at top level and this object is of variable size,
1137 make the actual type a hidden pointer to the real type and
1138 make the initializer be a memory allocation and initialization.
1139 Likewise for objects we aren't defining (presumed to be
1140 external references from other packages), but there we do
1141 not set up an initialization.
1143 If the object's size overflows, make an allocator too, so that
1144 Storage_Error gets raised. Note that we will never free
1145 such memory, so we presume it never will get allocated. */
1147 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1148 global_bindings_p () || !definition
1151 && ! allocatable_size_p (gnu_size,
1152 global_bindings_p () || !definition
1155 gnu_type = build_reference_type (gnu_type);
1156 gnu_size = NULL_TREE;
1160 /* In case this was a aliased object whose nominal subtype is
1161 unconstrained, the pointer above will be a thin pointer and
1162 build_allocator will automatically make the template.
1164 If we have a template initializer only (that we made above),
1165 pretend there is none and rely on what build_allocator creates
1166 again anyway. Otherwise (if we have a full initializer), get
1167 the data part and feed that to build_allocator.
1169 If we are elaborating a mutable object, tell build_allocator to
1170 ignore a possibly simpler size from the initializer, if any, as
1171 we must allocate the maximum possible size in this case. */
1175 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1177 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1178 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1181 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1183 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1184 && 1 == VEC_length (constructor_elt,
1185 CONSTRUCTOR_ELTS (gnu_expr)))
1189 = build_component_ref
1190 (gnu_expr, NULL_TREE,
1191 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1195 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1196 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1197 && !Is_Imported (gnat_entity))
1198 post_error ("?Storage_Error will be raised at run-time!",
1201 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1202 0, 0, gnat_entity, mutable_p);
1206 gnu_expr = NULL_TREE;
1211 /* If this object would go into the stack and has an alignment larger
1212 than the largest stack alignment the back-end can honor, resort to
1213 a variable of "aligning type". */
1214 if (!global_bindings_p () && !static_p && definition
1215 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1217 /* Create the new variable. No need for extra room before the
1218 aligned field as this is in automatic storage. */
1220 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1221 TYPE_SIZE_UNIT (gnu_type),
1222 BIGGEST_ALIGNMENT, 0);
1224 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1225 NULL_TREE, gnu_new_type, NULL_TREE, false,
1226 false, false, false, NULL, gnat_entity);
1228 /* Initialize the aligned field if we have an initializer. */
1231 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1233 (gnu_new_var, NULL_TREE,
1234 TYPE_FIELDS (gnu_new_type), false),
1238 /* And setup this entity as a reference to the aligned field. */
1239 gnu_type = build_reference_type (gnu_type);
1242 (ADDR_EXPR, gnu_type,
1243 build_component_ref (gnu_new_var, NULL_TREE,
1244 TYPE_FIELDS (gnu_new_type), false));
1246 gnu_size = NULL_TREE;
1252 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1253 | TYPE_QUAL_CONST));
1255 /* Convert the expression to the type of the object except in the
1256 case where the object's type is unconstrained or the object's type
1257 is a padded record whose field is of self-referential size. In
1258 the former case, converting will generate unnecessary evaluations
1259 of the CONSTRUCTOR to compute the size and in the latter case, we
1260 want to only copy the actual data. */
1262 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1263 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1264 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1265 && TYPE_IS_PADDING_P (gnu_type)
1266 && (CONTAINS_PLACEHOLDER_P
1267 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1268 gnu_expr = convert (gnu_type, gnu_expr);
1270 /* If this name is external or there was a name specified, use it,
1271 unless this is a VMS exception object since this would conflict
1272 with the symbol we need to export in addition. Don't use the
1273 Interface_Name if there is an address clause (see CD30005). */
1274 if (!Is_VMS_Exception (gnat_entity)
1275 && ((Present (Interface_Name (gnat_entity))
1276 && No (Address_Clause (gnat_entity)))
1277 || (Is_Public (gnat_entity)
1278 && (!Is_Imported (gnat_entity)
1279 || Is_Exported (gnat_entity)))))
1280 gnu_ext_name = create_concat_name (gnat_entity, 0);
1282 /* If this is constant initialized to a static constant and the
1283 object has an aggregate type, force it to be statically
1285 if (const_flag && gnu_expr && TREE_CONSTANT (gnu_expr)
1286 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1287 && (AGGREGATE_TYPE_P (gnu_type)
1288 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1289 && TYPE_IS_PADDING_P (gnu_type))))
1292 gnu_decl = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1293 gnu_expr, const_flag,
1294 Is_Public (gnat_entity),
1295 imported_p || !definition,
1296 static_p, attr_list, gnat_entity);
1297 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1298 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1299 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1301 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1302 if (global_bindings_p ())
1304 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1305 record_global_renaming_pointer (gnu_decl);
1309 if (definition && DECL_SIZE_UNIT (gnu_decl)
1310 && get_block_jmpbuf_decl ()
1311 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1312 || (flag_stack_check == GENERIC_STACK_CHECK
1313 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1314 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1315 add_stmt_with_node (build_call_1_expr
1316 (update_setjmp_buf_decl,
1317 build_unary_op (ADDR_EXPR, NULL_TREE,
1318 get_block_jmpbuf_decl ())),
1321 /* If this is a public constant or we're not optimizing and we're not
1322 making a VAR_DECL for it, make one just for export or debugger use.
1323 Likewise if the address is taken or if either the object or type is
1324 aliased. Make an external declaration for a reference, unless this
1325 is a Standard entity since there no real symbol at the object level
1327 if (TREE_CODE (gnu_decl) == CONST_DECL
1328 && (definition || Sloc (gnat_entity) > Standard_Location)
1329 && ((Is_Public (gnat_entity)
1330 && !Present (Address_Clause (gnat_entity)))
1332 || Address_Taken (gnat_entity)
1333 || Is_Aliased (gnat_entity)
1334 || Is_Aliased (Etype (gnat_entity))))
1337 = create_true_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1338 gnu_expr, true, Is_Public (gnat_entity),
1339 !definition, static_p, NULL,
1342 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1344 /* As debugging information will be generated for the variable,
1345 do not generate information for the constant. */
1346 DECL_IGNORED_P (gnu_decl) = true;
1349 /* If this is declared in a block that contains a block with an
1350 exception handler, we must force this variable in memory to
1351 suppress an invalid optimization. */
1352 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1353 && Exception_Mechanism != Back_End_Exceptions)
1354 TREE_ADDRESSABLE (gnu_decl) = 1;
1356 gnu_type = TREE_TYPE (gnu_decl);
1358 /* Back-annotate Alignment and Esize of the object if not already
1359 known, except for when the object is actually a pointer to the
1360 real object, since alignment and size of a pointer don't have
1361 anything to do with those of the designated object. Note that
1362 we pick the values of the type, not those of the object, to
1363 shield ourselves from low-level platform-dependent adjustments
1364 like alignment promotion. This is both consistent with all the
1365 treatment above, where alignment and size are set on the type of
1366 the object and not on the object directly, and makes it possible
1367 to support confirming representation clauses in all cases. */
1369 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1370 Set_Alignment (gnat_entity,
1371 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
1373 if (!used_by_ref && Unknown_Esize (gnat_entity))
1375 if (TREE_CODE (gnu_type) == RECORD_TYPE
1376 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
1378 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
1380 Set_Esize (gnat_entity, annotate_value (gnu_object_size));
1386 /* Return a TYPE_DECL for "void" that we previously made. */
1387 gnu_decl = void_type_decl_node;
1390 case E_Enumeration_Type:
1391 /* A special case, for the types Character and Wide_Character in
1392 Standard, we do not list all the literals. So if the literals
1393 are not specified, make this an unsigned type. */
1394 if (No (First_Literal (gnat_entity)))
1396 gnu_type = make_unsigned_type (esize);
1397 TYPE_NAME (gnu_type) = gnu_entity_id;
1399 /* Set the TYPE_STRING_FLAG for Ada Character and
1400 Wide_Character types. This is needed by the dwarf-2 debug writer to
1401 distinguish between unsigned integer types and character types. */
1402 TYPE_STRING_FLAG (gnu_type) = 1;
1406 /* Normal case of non-character type, or non-Standard character type */
1408 /* Here we have a list of enumeral constants in First_Literal.
1409 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1410 the list to be places into TYPE_FIELDS. Each node in the list
1411 is a TREE_LIST node whose TREE_VALUE is the literal name
1412 and whose TREE_PURPOSE is the value of the literal.
1414 Esize contains the number of bits needed to represent the enumeral
1415 type, Type_Low_Bound also points to the first literal and
1416 Type_High_Bound points to the last literal. */
1418 Entity_Id gnat_literal;
1419 tree gnu_literal_list = NULL_TREE;
1421 if (Is_Unsigned_Type (gnat_entity))
1422 gnu_type = make_unsigned_type (esize);
1424 gnu_type = make_signed_type (esize);
1426 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1428 for (gnat_literal = First_Literal (gnat_entity);
1429 Present (gnat_literal);
1430 gnat_literal = Next_Literal (gnat_literal))
1432 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1435 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1436 gnu_type, gnu_value, true, false, false,
1437 false, NULL, gnat_literal);
1439 save_gnu_tree (gnat_literal, gnu_literal, false);
1440 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1441 gnu_value, gnu_literal_list);
1444 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1446 /* Note that the bounds are updated at the end of this function
1447 because to avoid an infinite recursion when we get the bounds of
1448 this type, since those bounds are objects of this type. */
1452 case E_Signed_Integer_Type:
1453 case E_Ordinary_Fixed_Point_Type:
1454 case E_Decimal_Fixed_Point_Type:
1455 /* For integer types, just make a signed type the appropriate number
1457 gnu_type = make_signed_type (esize);
1460 case E_Modular_Integer_Type:
1461 /* For modular types, make the unsigned type of the proper number of
1462 bits and then set up the modulus, if required. */
1464 enum machine_mode mode;
1468 if (Is_Packed_Array_Type (gnat_entity))
1469 esize = UI_To_Int (RM_Size (gnat_entity));
1471 /* Find the smallest mode at least ESIZE bits wide and make a class
1474 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1475 GET_MODE_BITSIZE (mode) < esize;
1476 mode = GET_MODE_WIDER_MODE (mode))
1479 gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode));
1480 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
1481 = (Is_Packed_Array_Type (gnat_entity)
1482 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
1484 /* Get the modulus in this type. If it overflows, assume it is because
1485 it is equal to 2**Esize. Note that there is no overflow checking
1486 done on unsigned type, so we detect the overflow by looking for
1487 a modulus of zero, which is otherwise invalid. */
1488 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1490 if (!integer_zerop (gnu_modulus))
1492 TYPE_MODULAR_P (gnu_type) = 1;
1493 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1494 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1495 convert (gnu_type, integer_one_node));
1498 /* If we have to set TYPE_PRECISION different from its natural value,
1499 make a subtype to do do. Likewise if there is a modulus and
1500 it is not one greater than TYPE_MAX_VALUE. */
1501 if (TYPE_PRECISION (gnu_type) != esize
1502 || (TYPE_MODULAR_P (gnu_type)
1503 && !tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high)))
1505 tree gnu_subtype = make_node (INTEGER_TYPE);
1507 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1508 TREE_TYPE (gnu_subtype) = gnu_type;
1509 TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type);
1510 TYPE_MAX_VALUE (gnu_subtype)
1511 = TYPE_MODULAR_P (gnu_type)
1512 ? gnu_high : TYPE_MAX_VALUE (gnu_type);
1513 TYPE_PRECISION (gnu_subtype) = esize;
1514 TYPE_UNSIGNED (gnu_subtype) = 1;
1515 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1516 TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype)
1517 = (Is_Packed_Array_Type (gnat_entity)
1518 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
1519 layout_type (gnu_subtype);
1521 gnu_type = gnu_subtype;
1526 case E_Signed_Integer_Subtype:
1527 case E_Enumeration_Subtype:
1528 case E_Modular_Integer_Subtype:
1529 case E_Ordinary_Fixed_Point_Subtype:
1530 case E_Decimal_Fixed_Point_Subtype:
1532 /* For integral subtypes, we make a new INTEGER_TYPE. Note
1533 that we do not want to call build_range_type since we would
1534 like each subtype node to be distinct. This will be important
1535 when memory aliasing is implemented.
1537 The TREE_TYPE field of the INTEGER_TYPE we make points to the
1538 parent type; this fact is used by the arithmetic conversion
1541 We elaborate the Ancestor_Subtype if it is not in the current
1542 unit and one of our bounds is non-static. We do this to ensure
1543 consistent naming in the case where several subtypes share the same
1544 bounds by always elaborating the first such subtype first, thus
1548 && Present (Ancestor_Subtype (gnat_entity))
1549 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1550 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1551 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1552 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1555 gnu_type = make_node (INTEGER_TYPE);
1556 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1558 /* Set the precision to the Esize except for bit-packed arrays and
1559 subtypes of Standard.Boolean. */
1560 if (Is_Packed_Array_Type (gnat_entity)
1561 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1563 esize = UI_To_Int (RM_Size (gnat_entity));
1564 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1566 else if (TREE_CODE (TREE_TYPE (gnu_type)) == BOOLEAN_TYPE)
1569 TYPE_PRECISION (gnu_type) = esize;
1571 TYPE_MIN_VALUE (gnu_type)
1572 = convert (TREE_TYPE (gnu_type),
1573 elaborate_expression (Type_Low_Bound (gnat_entity),
1575 get_identifier ("L"), definition, 1,
1576 Needs_Debug_Info (gnat_entity)));
1578 TYPE_MAX_VALUE (gnu_type)
1579 = convert (TREE_TYPE (gnu_type),
1580 elaborate_expression (Type_High_Bound (gnat_entity),
1582 get_identifier ("U"), definition, 1,
1583 Needs_Debug_Info (gnat_entity)));
1585 /* One of the above calls might have caused us to be elaborated,
1586 so don't blow up if so. */
1587 if (present_gnu_tree (gnat_entity))
1589 maybe_present = true;
1593 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1594 = Has_Biased_Representation (gnat_entity);
1596 /* This should be an unsigned type if the lower bound is constant
1597 and non-negative or if the base type is unsigned; a signed type
1599 TYPE_UNSIGNED (gnu_type)
1600 = (TYPE_UNSIGNED (TREE_TYPE (gnu_type))
1601 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
1602 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
1603 || TYPE_BIASED_REPRESENTATION_P (gnu_type)
1604 || Is_Unsigned_Type (gnat_entity));
1606 layout_type (gnu_type);
1608 /* Inherit our alias set from what we're a subtype of. Subtypes
1609 are not different types and a pointer can designate any instance
1610 within a subtype hierarchy. */
1611 copy_alias_set (gnu_type, TREE_TYPE (gnu_type));
1613 /* If the type we are dealing with is to represent a packed array,
1614 we need to have the bits left justified on big-endian targets
1615 and right justified on little-endian targets. We also need to
1616 ensure that when the value is read (e.g. for comparison of two
1617 such values), we only get the good bits, since the unused bits
1618 are uninitialized. Both goals are accomplished by wrapping the
1619 modular value in an enclosing struct. */
1620 if (Is_Packed_Array_Type (gnat_entity)
1621 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1623 tree gnu_field_type = gnu_type;
1626 TYPE_RM_SIZE_NUM (gnu_field_type)
1627 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1628 gnu_type = make_node (RECORD_TYPE);
1629 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1631 /* Propagate the alignment of the modular type to the record.
1632 This means that bitpacked arrays have "ceil" alignment for
1633 their size, which may seem counter-intuitive but makes it
1634 possible to easily overlay them on modular types. */
1635 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1636 TYPE_PACKED (gnu_type) = 1;
1638 /* Create a stripped-down declaration of the original type, mainly
1640 create_type_decl (get_entity_name (gnat_entity), gnu_field_type,
1641 NULL, true, debug_info_p, gnat_entity);
1643 /* Don't notify the field as "addressable", since we won't be taking
1644 it's address and it would prevent create_field_decl from making a
1646 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1647 gnu_field_type, gnu_type, 1, 0, 0, 0);
1649 finish_record_type (gnu_type, gnu_field, 0, false);
1650 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1651 SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize));
1653 copy_alias_set (gnu_type, gnu_field_type);
1656 /* If the type we are dealing with has got a smaller alignment than the
1657 natural one, we need to wrap it up in a record type and under-align
1658 the latter. We reuse the padding machinery for this purpose. */
1659 else if (Known_Alignment (gnat_entity)
1660 && UI_Is_In_Int_Range (Alignment (gnat_entity))
1661 && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
1662 && align < TYPE_ALIGN (gnu_type))
1664 tree gnu_field_type = gnu_type;
1667 gnu_type = make_node (RECORD_TYPE);
1668 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1670 TYPE_ALIGN (gnu_type) = align;
1671 TYPE_PACKED (gnu_type) = 1;
1673 /* Create a stripped-down declaration of the original type, mainly
1675 create_type_decl (get_entity_name (gnat_entity), gnu_field_type,
1676 NULL, true, debug_info_p, gnat_entity);
1678 /* Don't notify the field as "addressable", since we won't be taking
1679 it's address and it would prevent create_field_decl from making a
1681 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1682 gnu_field_type, gnu_type, 1, 0, 0, 0);
1684 finish_record_type (gnu_type, gnu_field, 0, false);
1685 TYPE_IS_PADDING_P (gnu_type) = 1;
1686 SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize));
1688 copy_alias_set (gnu_type, gnu_field_type);
1691 /* Otherwise reset the alignment lest we computed it above. */
1697 case E_Floating_Point_Type:
1698 /* If this is a VAX floating-point type, use an integer of the proper
1699 size. All the operations will be handled with ASM statements. */
1700 if (Vax_Float (gnat_entity))
1702 gnu_type = make_signed_type (esize);
1703 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1704 SET_TYPE_DIGITS_VALUE (gnu_type,
1705 UI_To_gnu (Digits_Value (gnat_entity),
1710 /* The type of the Low and High bounds can be our type if this is
1711 a type from Standard, so set them at the end of the function. */
1712 gnu_type = make_node (REAL_TYPE);
1713 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1714 layout_type (gnu_type);
1717 case E_Floating_Point_Subtype:
1718 if (Vax_Float (gnat_entity))
1720 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1726 && Present (Ancestor_Subtype (gnat_entity))
1727 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1728 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1729 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1730 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1733 gnu_type = make_node (REAL_TYPE);
1734 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1735 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1737 TYPE_MIN_VALUE (gnu_type)
1738 = convert (TREE_TYPE (gnu_type),
1739 elaborate_expression (Type_Low_Bound (gnat_entity),
1740 gnat_entity, get_identifier ("L"),
1742 Needs_Debug_Info (gnat_entity)));
1744 TYPE_MAX_VALUE (gnu_type)
1745 = convert (TREE_TYPE (gnu_type),
1746 elaborate_expression (Type_High_Bound (gnat_entity),
1747 gnat_entity, get_identifier ("U"),
1749 Needs_Debug_Info (gnat_entity)));
1751 /* One of the above calls might have caused us to be elaborated,
1752 so don't blow up if so. */
1753 if (present_gnu_tree (gnat_entity))
1755 maybe_present = true;
1759 layout_type (gnu_type);
1761 /* Inherit our alias set from what we're a subtype of, as for
1762 integer subtypes. */
1763 copy_alias_set (gnu_type, TREE_TYPE (gnu_type));
1767 /* Array and String Types and Subtypes
1769 Unconstrained array types are represented by E_Array_Type and
1770 constrained array types are represented by E_Array_Subtype. There
1771 are no actual objects of an unconstrained array type; all we have
1772 are pointers to that type.
1774 The following fields are defined on array types and subtypes:
1776 Component_Type Component type of the array.
1777 Number_Dimensions Number of dimensions (an int).
1778 First_Index Type of first index. */
1783 tree gnu_template_fields = NULL_TREE;
1784 tree gnu_template_type = make_node (RECORD_TYPE);
1785 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1786 tree gnu_fat_type = make_node (RECORD_TYPE);
1787 int ndim = Number_Dimensions (gnat_entity);
1789 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1791 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1793 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
1794 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
1795 tree gnu_comp_size = 0;
1796 tree gnu_max_size = size_one_node;
1797 tree gnu_max_size_unit;
1798 Entity_Id gnat_ind_subtype;
1799 Entity_Id gnat_ind_base_subtype;
1800 tree gnu_template_reference;
1803 TYPE_NAME (gnu_template_type)
1804 = create_concat_name (gnat_entity, "XUB");
1806 /* Make a node for the array. If we are not defining the array
1807 suppress expanding incomplete types. */
1808 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1811 defer_incomplete_level++, this_deferred = true;
1813 /* Build the fat pointer type. Use a "void *" object instead of
1814 a pointer to the array type since we don't have the array type
1815 yet (it will reference the fat pointer via the bounds). */
1816 tem = chainon (chainon (NULL_TREE,
1817 create_field_decl (get_identifier ("P_ARRAY"),
1819 gnu_fat_type, 0, 0, 0, 0)),
1820 create_field_decl (get_identifier ("P_BOUNDS"),
1822 gnu_fat_type, 0, 0, 0, 0));
1824 /* Make sure we can put this into a register. */
1825 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1827 /* Do not finalize this record type since the types of its fields
1828 are still incomplete at this point. */
1829 finish_record_type (gnu_fat_type, tem, 0, true);
1830 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1832 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1833 is the fat pointer. This will be used to access the individual
1834 fields once we build them. */
1835 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1836 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1837 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1838 gnu_template_reference
1839 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1840 TREE_READONLY (gnu_template_reference) = 1;
1842 /* Now create the GCC type for each index and add the fields for
1843 that index to the template. */
1844 for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
1845 gnat_ind_base_subtype
1846 = First_Index (Implementation_Base_Type (gnat_entity));
1847 index < ndim && index >= 0;
1849 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1850 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1852 char field_name[10];
1853 tree gnu_ind_subtype
1854 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1855 tree gnu_base_subtype
1856 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1858 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1860 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1861 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1863 /* Make the FIELD_DECLs for the minimum and maximum of this
1864 type and then make extractions of that field from the
1866 sprintf (field_name, "LB%d", index);
1867 gnu_min_field = create_field_decl (get_identifier (field_name),
1869 gnu_template_type, 0, 0, 0, 0);
1870 field_name[0] = 'U';
1871 gnu_max_field = create_field_decl (get_identifier (field_name),
1873 gnu_template_type, 0, 0, 0, 0);
1875 Sloc_to_locus (Sloc (gnat_entity),
1876 &DECL_SOURCE_LOCATION (gnu_min_field));
1877 Sloc_to_locus (Sloc (gnat_entity),
1878 &DECL_SOURCE_LOCATION (gnu_max_field));
1879 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1881 /* We can't use build_component_ref here since the template
1882 type isn't complete yet. */
1883 gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype,
1884 gnu_template_reference, gnu_min_field,
1886 gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype,
1887 gnu_template_reference, gnu_max_field,
1889 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1891 /* Make a range type with the new ranges, but using
1892 the Ada subtype. Then we convert to sizetype. */
1893 gnu_index_types[index]
1894 = create_index_type (convert (sizetype, gnu_min),
1895 convert (sizetype, gnu_max),
1896 build_range_type (gnu_ind_subtype,
1899 /* Update the maximum size of the array, in elements. */
1901 = size_binop (MULT_EXPR, gnu_max_size,
1902 size_binop (PLUS_EXPR, size_one_node,
1903 size_binop (MINUS_EXPR, gnu_base_max,
1906 TYPE_NAME (gnu_index_types[index])
1907 = create_concat_name (gnat_entity, field_name);
1910 for (index = 0; index < ndim; index++)
1912 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1914 /* Install all the fields into the template. */
1915 finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
1916 TYPE_READONLY (gnu_template_type) = 1;
1918 /* Now make the array of arrays and update the pointer to the array
1919 in the fat pointer. Note that it is the first field. */
1920 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1922 /* Try to get a smaller form of the component if needed. */
1923 if ((Is_Packed (gnat_entity)
1924 || Has_Component_Size_Clause (gnat_entity))
1925 && !Is_Bit_Packed_Array (gnat_entity)
1926 && !Has_Aliased_Components (gnat_entity)
1927 && !Strict_Alignment (Component_Type (gnat_entity))
1928 && TREE_CODE (tem) == RECORD_TYPE
1929 && host_integerp (TYPE_SIZE (tem), 1))
1930 tem = make_packable_type (tem, false);
1932 if (Has_Atomic_Components (gnat_entity))
1933 check_ok_for_atomic (tem, gnat_entity, true);
1935 /* Get and validate any specified Component_Size, but if Packed,
1936 ignore it since the front end will have taken care of it. */
1938 = validate_size (Component_Size (gnat_entity), tem,
1940 (Is_Bit_Packed_Array (gnat_entity)
1941 ? TYPE_DECL : VAR_DECL),
1942 true, Has_Component_Size_Clause (gnat_entity));
1944 /* If the component type is a RECORD_TYPE that has a self-referential
1945 size, use the maximum size. */
1946 if (!gnu_comp_size && TREE_CODE (tem) == RECORD_TYPE
1947 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1948 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1950 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
1953 tem = make_type_from_size (tem, gnu_comp_size, false);
1955 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1956 "C_PAD", false, definition, true);
1957 /* If a padding record was made, declare it now since it will
1958 never be declared otherwise. This is necessary to ensure
1959 that its subtrees are properly marked. */
1960 if (tem != orig_tem)
1961 create_type_decl (TYPE_NAME (tem), tem, NULL, true,
1962 debug_info_p, gnat_entity);
1965 if (Has_Volatile_Components (gnat_entity))
1966 tem = build_qualified_type (tem,
1967 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1969 /* If Component_Size is not already specified, annotate it with the
1970 size of the component. */
1971 if (Unknown_Component_Size (gnat_entity))
1972 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1974 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
1975 size_binop (MULT_EXPR, gnu_max_size,
1976 TYPE_SIZE_UNIT (tem)));
1977 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
1978 size_binop (MULT_EXPR,
1979 convert (bitsizetype,
1983 for (index = ndim - 1; index >= 0; index--)
1985 tem = build_array_type (tem, gnu_index_types[index]);
1986 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1987 if (array_type_has_nonaliased_component (gnat_entity, tem))
1988 TYPE_NONALIASED_COMPONENT (tem) = 1;
1991 /* If an alignment is specified, use it if valid. But ignore it for
1992 types that represent the unpacked base type for packed arrays. If
1993 the alignment was requested with an explicit user alignment clause,
1995 if (No (Packed_Array_Type (gnat_entity))
1996 && Known_Alignment (gnat_entity))
1998 gcc_assert (Present (Alignment (gnat_entity)));
2000 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2002 if (Present (Alignment_Clause (gnat_entity)))
2003 TYPE_USER_ALIGN (tem) = 1;
2006 TYPE_CONVENTION_FORTRAN_P (tem)
2007 = (Convention (gnat_entity) == Convention_Fortran);
2008 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2010 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2011 corresponding fat pointer. */
2012 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2013 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2014 TYPE_MODE (gnu_type) = BLKmode;
2015 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2016 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2018 /* If the maximum size doesn't overflow, use it. */
2019 if (TREE_CODE (gnu_max_size) == INTEGER_CST
2020 && !TREE_OVERFLOW (gnu_max_size))
2022 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
2023 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2024 && !TREE_OVERFLOW (gnu_max_size_unit))
2025 TYPE_SIZE_UNIT (tem)
2026 = size_binop (MIN_EXPR, gnu_max_size_unit,
2027 TYPE_SIZE_UNIT (tem));
2029 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2030 tem, NULL, !Comes_From_Source (gnat_entity),
2031 debug_info_p, gnat_entity);
2033 /* Give the fat pointer type a name. */
2034 create_type_decl (create_concat_name (gnat_entity, "XUP"),
2035 gnu_fat_type, NULL, !Comes_From_Source (gnat_entity),
2036 debug_info_p, gnat_entity);
2038 /* Create the type to be used as what a thin pointer designates: an
2039 record type for the object and its template with the field offsets
2040 shifted to have the template at a negative offset. */
2041 tem = build_unc_object_type (gnu_template_type, tem,
2042 create_concat_name (gnat_entity, "XUT"));
2043 shift_unc_components_for_thin_pointers (tem);
2045 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2046 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2048 /* Give the thin pointer type a name. */
2049 create_type_decl (create_concat_name (gnat_entity, "XUX"),
2050 build_pointer_type (tem), NULL,
2051 !Comes_From_Source (gnat_entity), debug_info_p,
2056 case E_String_Subtype:
2057 case E_Array_Subtype:
2059 /* This is the actual data type for array variables. Multidimensional
2060 arrays are implemented in the gnu tree as arrays of arrays. Note
2061 that for the moment arrays which have sparse enumeration subtypes as
2062 index components create sparse arrays, which is obviously space
2063 inefficient but so much easier to code for now.
2065 Also note that the subtype never refers to the unconstrained
2066 array type, which is somewhat at variance with Ada semantics.
2068 First check to see if this is simply a renaming of the array
2069 type. If so, the result is the array type. */
2071 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2072 if (!Is_Constrained (gnat_entity))
2077 int array_dim = Number_Dimensions (gnat_entity);
2079 = ((Convention (gnat_entity) == Convention_Fortran)
2080 ? array_dim - 1 : 0);
2082 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
2083 Entity_Id gnat_ind_subtype;
2084 Entity_Id gnat_ind_base_subtype;
2085 tree gnu_base_type = gnu_type;
2086 tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
2087 tree gnu_comp_size = NULL_TREE;
2088 tree gnu_max_size = size_one_node;
2089 tree gnu_max_size_unit;
2090 bool need_index_type_struct = false;
2091 bool max_overflow = false;
2093 /* First create the gnu types for each index. Create types for
2094 debugging information to point to the index types if the
2095 are not integer types, have variable bounds, or are
2096 wider than sizetype. */
2098 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
2099 gnat_ind_base_subtype
2100 = First_Index (Implementation_Base_Type (gnat_entity));
2101 index < array_dim && index >= 0;
2103 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
2104 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
2106 tree gnu_index_subtype
2107 = get_unpadded_type (Etype (gnat_ind_subtype));
2109 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
2111 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
2112 tree gnu_base_subtype
2113 = get_unpadded_type (Etype (gnat_ind_base_subtype));
2115 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
2117 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
2118 tree gnu_base_type = get_base_type (gnu_base_subtype);
2119 tree gnu_base_base_min
2120 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
2121 tree gnu_base_base_max
2122 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
2126 /* If the minimum and maximum values both overflow in
2127 SIZETYPE, but the difference in the original type
2128 does not overflow in SIZETYPE, ignore the overflow
2130 if ((TYPE_PRECISION (gnu_index_subtype)
2131 > TYPE_PRECISION (sizetype)
2132 || TYPE_UNSIGNED (gnu_index_subtype)
2133 != TYPE_UNSIGNED (sizetype))
2134 && TREE_CODE (gnu_min) == INTEGER_CST
2135 && TREE_CODE (gnu_max) == INTEGER_CST
2136 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2138 (fold_build2 (MINUS_EXPR, gnu_index_subtype,
2139 TYPE_MAX_VALUE (gnu_index_subtype),
2140 TYPE_MIN_VALUE (gnu_index_subtype)))))
2142 TREE_OVERFLOW (gnu_min) = 0;
2143 TREE_OVERFLOW (gnu_max) = 0;
2146 /* Similarly, if the range is null, use bounds of 1..0 for
2147 the sizetype bounds. */
2148 else if ((TYPE_PRECISION (gnu_index_subtype)
2149 > TYPE_PRECISION (sizetype)
2150 || TYPE_UNSIGNED (gnu_index_subtype)
2151 != TYPE_UNSIGNED (sizetype))
2152 && TREE_CODE (gnu_min) == INTEGER_CST
2153 && TREE_CODE (gnu_max) == INTEGER_CST
2154 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2155 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
2156 TYPE_MIN_VALUE (gnu_index_subtype)))
2157 gnu_min = size_one_node, gnu_max = size_zero_node;
2159 /* Now compute the size of this bound. We need to provide
2160 GCC with an upper bound to use but have to deal with the
2161 "superflat" case. There are three ways to do this. If we
2162 can prove that the array can never be superflat, we can
2163 just use the high bound of the index subtype. If we can
2164 prove that the low bound minus one can't overflow, we
2165 can do this as MAX (hb, lb - 1). Otherwise, we have to use
2166 the expression hb >= lb ? hb : lb - 1. */
2167 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2169 /* See if the base array type is already flat. If it is, we
2170 are probably compiling an ACVC test, but it will cause the
2171 code below to malfunction if we don't handle it specially. */
2172 if (TREE_CODE (gnu_base_min) == INTEGER_CST
2173 && TREE_CODE (gnu_base_max) == INTEGER_CST
2174 && !TREE_OVERFLOW (gnu_base_min)
2175 && !TREE_OVERFLOW (gnu_base_max)
2176 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
2177 gnu_high = size_zero_node, gnu_min = size_one_node;
2179 /* If gnu_high is now an integer which overflowed, the array
2180 cannot be superflat. */
2181 else if (TREE_CODE (gnu_high) == INTEGER_CST
2182 && TREE_OVERFLOW (gnu_high))
2184 else if (TYPE_UNSIGNED (gnu_base_subtype)
2185 || TREE_CODE (gnu_high) == INTEGER_CST)
2186 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2190 (sizetype, build_binary_op (GE_EXPR, integer_type_node,
2194 gnu_index_type[index]
2195 = create_index_type (gnu_min, gnu_high, gnu_index_subtype,
2198 /* Also compute the maximum size of the array. Here we
2199 see if any constraint on the index type of the base type
2200 can be used in the case of self-referential bound on
2201 the index type of the subtype. We look for a non-"infinite"
2202 and non-self-referential bound from any type involved and
2203 handle each bound separately. */
2205 if ((TREE_CODE (gnu_min) == INTEGER_CST
2206 && !TREE_OVERFLOW (gnu_min)
2207 && !operand_equal_p (gnu_min, gnu_base_base_min, 0))
2208 || !CONTAINS_PLACEHOLDER_P (gnu_min)
2209 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2210 && !TREE_OVERFLOW (gnu_base_min)))
2211 gnu_base_min = gnu_min;
2213 if ((TREE_CODE (gnu_max) == INTEGER_CST
2214 && !TREE_OVERFLOW (gnu_max)
2215 && !operand_equal_p (gnu_max, gnu_base_base_max, 0))
2216 || !CONTAINS_PLACEHOLDER_P (gnu_max)
2217 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2218 && !TREE_OVERFLOW (gnu_base_max)))
2219 gnu_base_max = gnu_max;
2221 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2222 && TREE_OVERFLOW (gnu_base_min))
2223 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2224 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2225 && TREE_OVERFLOW (gnu_base_max))
2226 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2227 max_overflow = true;
2229 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
2230 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
2233 = size_binop (MAX_EXPR,
2234 size_binop (PLUS_EXPR, size_one_node,
2235 size_binop (MINUS_EXPR, gnu_base_max,
2239 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2240 && TREE_OVERFLOW (gnu_this_max))
2241 max_overflow = true;
2244 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2246 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
2247 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
2249 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
2250 || (TREE_TYPE (gnu_index_subtype)
2251 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
2253 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
2254 || (TYPE_PRECISION (gnu_index_subtype)
2255 > TYPE_PRECISION (sizetype)))
2256 need_index_type_struct = true;
2259 /* Then flatten: create the array of arrays. For an array type
2260 used to implement a packed array, get the component type from
2261 the original array type since the representation clauses that
2262 can affect it are on the latter. */
2263 if (Is_Packed_Array_Type (gnat_entity)
2264 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2266 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2267 for (index = array_dim - 1; index >= 0; index--)
2268 gnu_type = TREE_TYPE (gnu_type);
2270 /* One of the above calls might have caused us to be elaborated,
2271 so don't blow up if so. */
2272 if (present_gnu_tree (gnat_entity))
2274 maybe_present = true;
2280 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
2282 /* One of the above calls might have caused us to be elaborated,
2283 so don't blow up if so. */
2284 if (present_gnu_tree (gnat_entity))
2286 maybe_present = true;
2290 /* Try to get a smaller form of the component if needed. */
2291 if ((Is_Packed (gnat_entity)
2292 || Has_Component_Size_Clause (gnat_entity))
2293 && !Is_Bit_Packed_Array (gnat_entity)
2294 && !Has_Aliased_Components (gnat_entity)
2295 && !Strict_Alignment (Component_Type (gnat_entity))
2296 && TREE_CODE (gnu_type) == RECORD_TYPE
2297 && host_integerp (TYPE_SIZE (gnu_type), 1))
2298 gnu_type = make_packable_type (gnu_type, false);
2300 /* Get and validate any specified Component_Size, but if Packed,
2301 ignore it since the front end will have taken care of it. */
2303 = validate_size (Component_Size (gnat_entity), gnu_type,
2305 (Is_Bit_Packed_Array (gnat_entity)
2306 ? TYPE_DECL : VAR_DECL), true,
2307 Has_Component_Size_Clause (gnat_entity));
2309 /* If the component type is a RECORD_TYPE that has a
2310 self-referential size, use the maximum size. */
2312 && TREE_CODE (gnu_type) == RECORD_TYPE
2313 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2314 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
2316 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
2320 = make_type_from_size (gnu_type, gnu_comp_size, false);
2321 orig_gnu_type = gnu_type;
2322 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
2323 gnat_entity, "C_PAD", false,
2325 /* If a padding record was made, declare it now since it
2326 will never be declared otherwise. This is necessary
2327 to ensure that its subtrees are properly marked. */
2328 if (gnu_type != orig_gnu_type)
2329 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL,
2330 true, debug_info_p, gnat_entity);
2333 if (Has_Volatile_Components (Base_Type (gnat_entity)))
2334 gnu_type = build_qualified_type (gnu_type,
2335 (TYPE_QUALS (gnu_type)
2336 | TYPE_QUAL_VOLATILE));
2339 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2340 TYPE_SIZE_UNIT (gnu_type));
2341 gnu_max_size = size_binop (MULT_EXPR,
2342 convert (bitsizetype, gnu_max_size),
2343 TYPE_SIZE (gnu_type));
2345 for (index = array_dim - 1; index >= 0; index --)
2347 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
2348 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2349 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2350 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2353 /* If we are at file level and this is a multi-dimensional array, we
2354 need to make a variable corresponding to the stride of the
2355 inner dimensions. */
2356 if (global_bindings_p () && array_dim > 1)
2358 tree gnu_str_name = get_identifier ("ST");
2361 for (gnu_arr_type = TREE_TYPE (gnu_type);
2362 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2363 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2364 gnu_str_name = concat_id_with_name (gnu_str_name, "ST"))
2366 tree eltype = TREE_TYPE (gnu_arr_type);
2368 TYPE_SIZE (gnu_arr_type)
2369 = elaborate_expression_1 (gnat_entity, gnat_entity,
2370 TYPE_SIZE (gnu_arr_type),
2371 gnu_str_name, definition, 0);
2373 /* ??? For now, store the size as a multiple of the
2374 alignment of the element type in bytes so that we
2375 can see the alignment from the tree. */
2376 TYPE_SIZE_UNIT (gnu_arr_type)
2378 (MULT_EXPR, sizetype,
2379 elaborate_expression_1
2380 (gnat_entity, gnat_entity,
2381 build_binary_op (EXACT_DIV_EXPR, sizetype,
2382 TYPE_SIZE_UNIT (gnu_arr_type),
2383 size_int (TYPE_ALIGN (eltype)
2385 concat_id_with_name (gnu_str_name, "A_U"),
2387 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2389 /* ??? create_type_decl is not invoked on the inner types so
2390 the MULT_EXPR node built above will never be marked. */
2391 mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type));
2395 /* If we need to write out a record type giving the names of
2396 the bounds, do it now. */
2397 if (need_index_type_struct && debug_info_p)
2399 tree gnu_bound_rec_type = make_node (RECORD_TYPE);
2400 tree gnu_field_list = NULL_TREE;
2403 TYPE_NAME (gnu_bound_rec_type)
2404 = create_concat_name (gnat_entity, "XA");
2406 for (index = array_dim - 1; index >= 0; index--)
2409 = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type[index]));
2411 if (TREE_CODE (gnu_type_name) == TYPE_DECL)
2412 gnu_type_name = DECL_NAME (gnu_type_name);
2414 gnu_field = create_field_decl (gnu_type_name,
2417 0, NULL_TREE, NULL_TREE, 0);
2418 TREE_CHAIN (gnu_field) = gnu_field_list;
2419 gnu_field_list = gnu_field;
2422 finish_record_type (gnu_bound_rec_type, gnu_field_list,
2425 TYPE_STUB_DECL (gnu_type)
2426 = build_decl (TYPE_DECL, NULL_TREE, gnu_type);
2429 (TYPE_STUB_DECL (gnu_type), gnu_bound_rec_type);
2432 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2433 = (Convention (gnat_entity) == Convention_Fortran);
2434 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2435 = (Is_Packed_Array_Type (gnat_entity)
2436 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2438 /* If our size depends on a placeholder and the maximum size doesn't
2439 overflow, use it. */
2440 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2441 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2442 && TREE_OVERFLOW (gnu_max_size))
2443 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2444 && TREE_OVERFLOW (gnu_max_size_unit))
2447 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2448 TYPE_SIZE (gnu_type));
2449 TYPE_SIZE_UNIT (gnu_type)
2450 = size_binop (MIN_EXPR, gnu_max_size_unit,
2451 TYPE_SIZE_UNIT (gnu_type));
2454 /* Set our alias set to that of our base type. This gives all
2455 array subtypes the same alias set. */
2456 copy_alias_set (gnu_type, gnu_base_type);
2459 /* If this is a packed type, make this type the same as the packed
2460 array type, but do some adjusting in the type first. */
2462 if (Present (Packed_Array_Type (gnat_entity)))
2464 Entity_Id gnat_index;
2465 tree gnu_inner_type;
2467 /* First finish the type we had been making so that we output
2468 debugging information for it */
2470 = build_qualified_type (gnu_type,
2471 (TYPE_QUALS (gnu_type)
2472 | (TYPE_QUAL_VOLATILE
2473 * Treat_As_Volatile (gnat_entity))));
2474 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2475 !Comes_From_Source (gnat_entity),
2476 debug_info_p, gnat_entity);
2477 if (!Comes_From_Source (gnat_entity))
2478 DECL_ARTIFICIAL (gnu_decl) = 1;
2480 /* Save it as our equivalent in case the call below elaborates
2482 save_gnu_tree (gnat_entity, gnu_decl, false);
2484 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2486 this_made_decl = true;
2487 gnu_type = TREE_TYPE (gnu_decl);
2488 save_gnu_tree (gnat_entity, NULL_TREE, false);
2490 gnu_inner_type = gnu_type;
2491 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2492 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2493 || TYPE_IS_PADDING_P (gnu_inner_type)))
2494 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2496 /* We need to point the type we just made to our index type so
2497 the actual bounds can be put into a template. */
2499 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2500 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2501 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2502 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2504 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2506 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2507 If it is, we need to make another type. */
2508 if (TYPE_MODULAR_P (gnu_inner_type))
2512 gnu_subtype = make_node (INTEGER_TYPE);
2514 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2515 TYPE_MIN_VALUE (gnu_subtype)
2516 = TYPE_MIN_VALUE (gnu_inner_type);
2517 TYPE_MAX_VALUE (gnu_subtype)
2518 = TYPE_MAX_VALUE (gnu_inner_type);
2519 TYPE_PRECISION (gnu_subtype)
2520 = TYPE_PRECISION (gnu_inner_type);
2521 TYPE_UNSIGNED (gnu_subtype)
2522 = TYPE_UNSIGNED (gnu_inner_type);
2523 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2524 layout_type (gnu_subtype);
2526 gnu_inner_type = gnu_subtype;
2529 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2532 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2534 for (gnat_index = First_Index (gnat_entity);
2535 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2536 SET_TYPE_ACTUAL_BOUNDS
2538 tree_cons (NULL_TREE,
2539 get_unpadded_type (Etype (gnat_index)),
2540 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2542 if (Convention (gnat_entity) != Convention_Fortran)
2543 SET_TYPE_ACTUAL_BOUNDS
2545 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2547 if (TREE_CODE (gnu_type) == RECORD_TYPE
2548 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2549 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2553 /* Abort if packed array with no packed array type field set. */
2555 gcc_assert (!Is_Packed (gnat_entity));
2559 case E_String_Literal_Subtype:
2560 /* Create the type for a string literal. */
2562 Entity_Id gnat_full_type
2563 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2564 && Present (Full_View (Etype (gnat_entity)))
2565 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2566 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2567 tree gnu_string_array_type
2568 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2569 tree gnu_string_index_type
2570 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2571 (TYPE_DOMAIN (gnu_string_array_type))));
2572 tree gnu_lower_bound
2573 = convert (gnu_string_index_type,
2574 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2575 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2576 tree gnu_length = ssize_int (length - 1);
2577 tree gnu_upper_bound
2578 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2580 convert (gnu_string_index_type, gnu_length));
2582 = build_range_type (gnu_string_index_type,
2583 gnu_lower_bound, gnu_upper_bound);
2585 = create_index_type (convert (sizetype,
2586 TYPE_MIN_VALUE (gnu_range_type)),
2588 TYPE_MAX_VALUE (gnu_range_type)),
2589 gnu_range_type, gnat_entity);
2592 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2594 copy_alias_set (gnu_type, gnu_string_type);
2598 /* Record Types and Subtypes
2600 The following fields are defined on record types:
2602 Has_Discriminants True if the record has discriminants
2603 First_Discriminant Points to head of list of discriminants
2604 First_Entity Points to head of list of fields
2605 Is_Tagged_Type True if the record is tagged
2607 Implementation of Ada records and discriminated records:
2609 A record type definition is transformed into the equivalent of a C
2610 struct definition. The fields that are the discriminants which are
2611 found in the Full_Type_Declaration node and the elements of the
2612 Component_List found in the Record_Type_Definition node. The
2613 Component_List can be a recursive structure since each Variant of
2614 the Variant_Part of the Component_List has a Component_List.
2616 Processing of a record type definition comprises starting the list of
2617 field declarations here from the discriminants and the calling the
2618 function components_to_record to add the rest of the fields from the
2619 component list and return the gnu type node. The function
2620 components_to_record will call itself recursively as it traverses
2624 if (Has_Complex_Representation (gnat_entity))
2627 = build_complex_type
2629 (Etype (Defining_Entity
2630 (First (Component_Items
2633 (Declaration_Node (gnat_entity)))))))));
2639 Node_Id full_definition = Declaration_Node (gnat_entity);
2640 Node_Id record_definition = Type_Definition (full_definition);
2641 Entity_Id gnat_field;
2643 tree gnu_field_list = NULL_TREE;
2644 tree gnu_get_parent;
2645 /* Set PACKED in keeping with gnat_to_gnu_field. */
2647 = Is_Packed (gnat_entity)
2649 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2651 : (Known_Alignment (gnat_entity)
2652 || (Strict_Alignment (gnat_entity)
2653 && Known_Static_Esize (gnat_entity)))
2656 bool has_rep = Has_Specified_Layout (gnat_entity);
2657 bool all_rep = has_rep;
2659 = (Is_Tagged_Type (gnat_entity)
2660 && Nkind (record_definition) == N_Derived_Type_Definition);
2662 /* See if all fields have a rep clause. Stop when we find one
2664 for (gnat_field = First_Entity (gnat_entity);
2665 Present (gnat_field) && all_rep;
2666 gnat_field = Next_Entity (gnat_field))
2667 if ((Ekind (gnat_field) == E_Component
2668 || Ekind (gnat_field) == E_Discriminant)
2669 && No (Component_Clause (gnat_field)))
2672 /* If this is a record extension, go a level further to find the
2673 record definition. Also, verify we have a Parent_Subtype. */
2676 if (!type_annotate_only
2677 || Present (Record_Extension_Part (record_definition)))
2678 record_definition = Record_Extension_Part (record_definition);
2680 gcc_assert (type_annotate_only
2681 || Present (Parent_Subtype (gnat_entity)));
2684 /* Make a node for the record. If we are not defining the record,
2685 suppress expanding incomplete types. */
2686 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2687 TYPE_NAME (gnu_type) = gnu_entity_id;
2688 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2691 defer_incomplete_level++, this_deferred = true;
2693 /* If both a size and rep clause was specified, put the size in
2694 the record type now so that it can get the proper mode. */
2695 if (has_rep && Known_Esize (gnat_entity))
2696 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2698 /* Always set the alignment here so that it can be used to
2699 set the mode, if it is making the alignment stricter. If
2700 it is invalid, it will be checked again below. If this is to
2701 be Atomic, choose a default alignment of a word unless we know
2702 the size and it's smaller. */
2703 if (Known_Alignment (gnat_entity))
2704 TYPE_ALIGN (gnu_type)
2705 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2706 else if (Is_Atomic (gnat_entity))
2707 TYPE_ALIGN (gnu_type)
2708 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2709 /* If a type needs strict alignment, the minimum size will be the
2710 type size instead of the RM size (see validate_size). Cap the
2711 alignment, lest it causes this type size to become too large. */
2712 else if (Strict_Alignment (gnat_entity)
2713 && Known_Static_Esize (gnat_entity))
2715 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2716 unsigned int raw_align = raw_size & -raw_size;
2717 if (raw_align < BIGGEST_ALIGNMENT)
2718 TYPE_ALIGN (gnu_type) = raw_align;
2721 TYPE_ALIGN (gnu_type) = 0;
2723 /* If we have a Parent_Subtype, make a field for the parent. If
2724 this record has rep clauses, force the position to zero. */
2725 if (Present (Parent_Subtype (gnat_entity)))
2727 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2730 /* A major complexity here is that the parent subtype will
2731 reference our discriminants in its Discriminant_Constraint
2732 list. But those must reference the parent component of this
2733 record which is of the parent subtype we have not built yet!
2734 To break the circle we first build a dummy COMPONENT_REF which
2735 represents the "get to the parent" operation and initialize
2736 each of those discriminants to a COMPONENT_REF of the above
2737 dummy parent referencing the corresponding discriminant of the
2738 base type of the parent subtype. */
2739 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2740 build0 (PLACEHOLDER_EXPR, gnu_type),
2741 build_decl (FIELD_DECL, NULL_TREE,
2745 if (Has_Discriminants (gnat_entity))
2746 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2747 Present (gnat_field);
2748 gnat_field = Next_Stored_Discriminant (gnat_field))
2749 if (Present (Corresponding_Discriminant (gnat_field)))
2752 build3 (COMPONENT_REF,
2753 get_unpadded_type (Etype (gnat_field)),
2755 gnat_to_gnu_field_decl (Corresponding_Discriminant
2760 /* Then we build the parent subtype. */
2761 gnu_parent = gnat_to_gnu_type (gnat_parent);
2763 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2764 initially built. The discriminants must reference the fields
2765 of the parent subtype and not those of its base type for the
2766 placeholder machinery to properly work. */
2767 if (Has_Discriminants (gnat_entity))
2768 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2769 Present (gnat_field);
2770 gnat_field = Next_Stored_Discriminant (gnat_field))
2771 if (Present (Corresponding_Discriminant (gnat_field)))
2773 Entity_Id field = Empty;
2774 for (field = First_Stored_Discriminant (gnat_parent);
2776 field = Next_Stored_Discriminant (field))
2777 if (same_discriminant_p (gnat_field, field))
2779 gcc_assert (Present (field));
2780 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2781 = gnat_to_gnu_field_decl (field);
2784 /* The "get to the parent" COMPONENT_REF must be given its
2786 TREE_TYPE (gnu_get_parent) = gnu_parent;
2788 /* ...and reference the _parent field of this record. */
2790 = create_field_decl (get_identifier
2791 (Get_Name_String (Name_uParent)),
2792 gnu_parent, gnu_type, 0,
2793 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2794 has_rep ? bitsize_zero_node : 0, 1);
2795 DECL_INTERNAL_P (gnu_field_list) = 1;
2796 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2799 /* Make the fields for the discriminants and put them into the record
2800 unless it's an Unchecked_Union. */
2801 if (Has_Discriminants (gnat_entity))
2802 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2803 Present (gnat_field);
2804 gnat_field = Next_Stored_Discriminant (gnat_field))
2806 /* If this is a record extension and this discriminant
2807 is the renaming of another discriminant, we've already
2808 handled the discriminant above. */
2809 if (Present (Parent_Subtype (gnat_entity))
2810 && Present (Corresponding_Discriminant (gnat_field)))
2814 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2816 /* Make an expression using a PLACEHOLDER_EXPR from the
2817 FIELD_DECL node just created and link that with the
2818 corresponding GNAT defining identifier. Then add to the
2820 save_gnu_tree (gnat_field,
2821 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2822 build0 (PLACEHOLDER_EXPR,
2823 DECL_CONTEXT (gnu_field)),
2824 gnu_field, NULL_TREE),
2827 if (!Is_Unchecked_Union (gnat_entity))
2829 TREE_CHAIN (gnu_field) = gnu_field_list;
2830 gnu_field_list = gnu_field;
2834 /* Put the discriminants into the record (backwards), so we can
2835 know the appropriate discriminant to use for the names of the
2837 TYPE_FIELDS (gnu_type) = gnu_field_list;
2839 /* Add the listed fields into the record and finish it up. */
2840 components_to_record (gnu_type, Component_List (record_definition),
2841 gnu_field_list, packed, definition, NULL,
2842 false, all_rep, false,
2843 Is_Unchecked_Union (gnat_entity));
2845 /* We used to remove the associations of the discriminants and
2846 _Parent for validity checking, but we may need them if there's
2847 Freeze_Node for a subtype used in this record. */
2848 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2849 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2851 /* If it is a tagged record force the type to BLKmode to insure
2852 that these objects will always be placed in memory. Do the
2853 same thing for limited record types. */
2854 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2855 TYPE_MODE (gnu_type) = BLKmode;
2857 /* If this is a derived type, we must make the alias set of this type
2858 the same as that of the type we are derived from. We assume here
2859 that the other type is already frozen. */
2860 if (Etype (gnat_entity) != gnat_entity
2861 && !(Is_Private_Type (Etype (gnat_entity))
2862 && Full_View (Etype (gnat_entity)) == gnat_entity))
2863 copy_alias_set (gnu_type, gnat_to_gnu_type (Etype (gnat_entity)));
2865 /* Fill in locations of fields. */
2866 annotate_rep (gnat_entity, gnu_type);
2868 /* If there are any entities in the chain corresponding to
2869 components that we did not elaborate, ensure we elaborate their
2870 types if they are Itypes. */
2871 for (gnat_temp = First_Entity (gnat_entity);
2872 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2873 if ((Ekind (gnat_temp) == E_Component
2874 || Ekind (gnat_temp) == E_Discriminant)
2875 && Is_Itype (Etype (gnat_temp))
2876 && !present_gnu_tree (gnat_temp))
2877 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2881 case E_Class_Wide_Subtype:
2882 /* If an equivalent type is present, that is what we should use.
2883 Otherwise, fall through to handle this like a record subtype
2884 since it may have constraints. */
2885 if (gnat_equiv_type != gnat_entity)
2887 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2888 maybe_present = true;
2892 /* ... fall through ... */
2894 case E_Record_Subtype:
2896 /* If Cloned_Subtype is Present it means this record subtype has
2897 identical layout to that type or subtype and we should use
2898 that GCC type for this one. The front end guarantees that
2899 the component list is shared. */
2900 if (Present (Cloned_Subtype (gnat_entity)))
2902 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2904 maybe_present = true;
2907 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2908 changing the type, make a new type with each field having the
2909 type of the field in the new subtype but having the position
2910 computed by transforming every discriminant reference according
2911 to the constraints. We don't see any difference between
2912 private and nonprivate type here since derivations from types should
2913 have been deferred until the completion of the private type. */
2916 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2921 defer_incomplete_level++, this_deferred = true;
2923 /* Get the base type initially for its alignment and sizes. But
2924 if it is a padded type, we do all the other work with the
2926 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
2928 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
2929 && TYPE_IS_PADDING_P (gnu_base_type))
2930 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
2932 gnu_type = gnu_orig_type = gnu_base_type;
2934 if (present_gnu_tree (gnat_entity))
2936 maybe_present = true;
2940 /* When the type has discriminants, and these discriminants
2941 affect the shape of what it built, factor them in.
2943 If we are making a subtype of an Unchecked_Union (must be an
2944 Itype), just return the type.
2946 We can't just use Is_Constrained because private subtypes without
2947 discriminants of full types with discriminants with default
2948 expressions are Is_Constrained but aren't constrained! */
2950 if (IN (Ekind (gnat_base_type), Record_Kind)
2951 && !Is_For_Access_Subtype (gnat_entity)
2952 && !Is_Unchecked_Union (gnat_base_type)
2953 && Is_Constrained (gnat_entity)
2954 && Stored_Constraint (gnat_entity) != No_Elist
2955 && Present (Discriminant_Constraint (gnat_entity)))
2957 Entity_Id gnat_field;
2958 tree gnu_field_list = 0;
2960 = compute_field_positions (gnu_orig_type, NULL_TREE,
2961 size_zero_node, bitsize_zero_node,
2964 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
2968 gnu_type = make_node (RECORD_TYPE);
2969 TYPE_NAME (gnu_type) = gnu_entity_id;
2970 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2972 /* Set the size, alignment and alias set of the new type to
2973 match that of the old one, doing required substitutions.
2974 We do it this early because we need the size of the new
2975 type below to discard old fields if necessary. */
2976 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
2977 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
2978 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
2979 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2980 copy_alias_set (gnu_type, gnu_base_type);
2982 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2983 for (gnu_temp = gnu_subst_list;
2984 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2985 TYPE_SIZE (gnu_type)
2986 = substitute_in_expr (TYPE_SIZE (gnu_type),
2987 TREE_PURPOSE (gnu_temp),
2988 TREE_VALUE (gnu_temp));
2990 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
2991 for (gnu_temp = gnu_subst_list;
2992 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2993 TYPE_SIZE_UNIT (gnu_type)
2994 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
2995 TREE_PURPOSE (gnu_temp),
2996 TREE_VALUE (gnu_temp));
2998 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
2999 for (gnu_temp = gnu_subst_list;
3000 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3002 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3003 TREE_PURPOSE (gnu_temp),
3004 TREE_VALUE (gnu_temp)));
3006 for (gnat_field = First_Entity (gnat_entity);
3007 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3008 if ((Ekind (gnat_field) == E_Component
3009 || Ekind (gnat_field) == E_Discriminant)
3010 && (Underlying_Type (Scope (Original_Record_Component
3013 && (No (Corresponding_Discriminant (gnat_field))
3014 || !Is_Tagged_Type (gnat_base_type)))
3017 = gnat_to_gnu_field_decl (Original_Record_Component
3020 = TREE_VALUE (purpose_member (gnu_old_field,
3022 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3023 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3025 = gnat_to_gnu_type (Etype (gnat_field));
3026 tree gnu_size = TYPE_SIZE (gnu_field_type);
3027 tree gnu_new_pos = NULL_TREE;
3028 unsigned int offset_align
3029 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
3033 /* If there was a component clause, the field types must be
3034 the same for the type and subtype, so copy the data from
3035 the old field to avoid recomputation here. Also if the
3036 field is justified modular and the optimization in
3037 gnat_to_gnu_field was applied. */
3038 if (Present (Component_Clause
3039 (Original_Record_Component (gnat_field)))
3040 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3041 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3042 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3043 == TREE_TYPE (gnu_old_field)))
3045 gnu_size = DECL_SIZE (gnu_old_field);
3046 gnu_field_type = TREE_TYPE (gnu_old_field);
3049 /* If the old field was packed and of constant size, we
3050 have to get the old size here, as it might differ from
3051 what the Etype conveys and the latter might overlap
3052 onto the following field. Try to arrange the type for
3053 possible better packing along the way. */
3054 else if (DECL_PACKED (gnu_old_field)
3055 && TREE_CODE (DECL_SIZE (gnu_old_field))
3058 gnu_size = DECL_SIZE (gnu_old_field);
3059 if (TYPE_MODE (gnu_field_type) == BLKmode
3060 && TREE_CODE (gnu_field_type) == RECORD_TYPE
3061 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3063 = make_packable_type (gnu_field_type, true);
3066 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3067 for (gnu_temp = gnu_subst_list;
3068 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3069 gnu_pos = substitute_in_expr (gnu_pos,
3070 TREE_PURPOSE (gnu_temp),
3071 TREE_VALUE (gnu_temp));
3073 /* If the position is now a constant, we can set it as the
3074 position of the field when we make it. Otherwise, we need
3075 to deal with it specially below. */
3076 if (TREE_CONSTANT (gnu_pos))
3078 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3080 /* Discard old fields that are outside the new type.
3081 This avoids confusing code scanning it to decide
3082 how to pass it to functions on some platforms. */
3083 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3084 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3085 && !integer_zerop (gnu_size)
3086 && !tree_int_cst_lt (gnu_new_pos,
3087 TYPE_SIZE (gnu_type)))
3093 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3094 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3095 !DECL_NONADDRESSABLE_P (gnu_old_field));
3097 if (!TREE_CONSTANT (gnu_pos))
3099 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3100 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3101 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3102 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3103 DECL_SIZE (gnu_field) = gnu_size;
3104 DECL_SIZE_UNIT (gnu_field)
3105 = convert (sizetype,
3106 size_binop (CEIL_DIV_EXPR, gnu_size,
3107 bitsize_unit_node));
3108 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3111 DECL_INTERNAL_P (gnu_field)
3112 = DECL_INTERNAL_P (gnu_old_field);
3113 SET_DECL_ORIGINAL_FIELD
3114 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3115 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3117 DECL_DISCRIMINANT_NUMBER (gnu_field)
3118 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3119 TREE_THIS_VOLATILE (gnu_field)
3120 = TREE_THIS_VOLATILE (gnu_old_field);
3121 TREE_CHAIN (gnu_field) = gnu_field_list;
3122 gnu_field_list = gnu_field;
3123 save_gnu_tree (gnat_field, gnu_field, false);
3126 /* Now go through the entities again looking for Itypes that
3127 we have not elaborated but should (e.g., Etypes of fields
3128 that have Original_Components). */
3129 for (gnat_field = First_Entity (gnat_entity);
3130 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3131 if ((Ekind (gnat_field) == E_Discriminant
3132 || Ekind (gnat_field) == E_Component)
3133 && !present_gnu_tree (Etype (gnat_field)))
3134 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3136 /* Do not finalize it since we're going to modify it below. */
3137 gnu_field_list = nreverse (gnu_field_list);
3138 finish_record_type (gnu_type, gnu_field_list, 2, true);
3140 /* Finalize size and mode. */
3141 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3142 TYPE_SIZE_UNIT (gnu_type)
3143 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3145 compute_record_mode (gnu_type);
3147 /* Fill in locations of fields. */
3148 annotate_rep (gnat_entity, gnu_type);
3150 /* We've built a new type, make an XVS type to show what this
3151 is a subtype of. Some debuggers require the XVS type to be
3152 output first, so do it in that order. */
3155 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3156 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
3158 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
3159 gnu_orig_name = DECL_NAME (gnu_orig_name);
3161 TYPE_NAME (gnu_subtype_marker)
3162 = create_concat_name (gnat_entity, "XVS");
3163 finish_record_type (gnu_subtype_marker,
3164 create_field_decl (gnu_orig_name,
3171 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3172 gnu_subtype_marker);
3175 /* Now we can finalize it. */
3176 rest_of_record_type_compilation (gnu_type);
3179 /* Otherwise, go down all the components in the new type and
3180 make them equivalent to those in the base type. */
3182 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3183 gnat_temp = Next_Entity (gnat_temp))
3184 if ((Ekind (gnat_temp) == E_Discriminant
3185 && !Is_Unchecked_Union (gnat_base_type))
3186 || Ekind (gnat_temp) == E_Component)
3187 save_gnu_tree (gnat_temp,
3188 gnat_to_gnu_field_decl
3189 (Original_Record_Component (gnat_temp)), false);
3193 case E_Access_Subprogram_Type:
3194 /* Use the special descriptor type for dispatch tables if needed,
3195 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3196 Note that we are only required to do so for static tables in
3197 order to be compatible with the C++ ABI, but Ada 2005 allows
3198 to extend library level tagged types at the local level so
3199 we do it in the non-static case as well. */
3200 if (TARGET_VTABLE_USES_DESCRIPTORS
3201 && Is_Dispatch_Table_Entity (gnat_entity))
3203 gnu_type = fdesc_type_node;
3204 gnu_size = TYPE_SIZE (gnu_type);
3208 /* ... fall through ... */
3210 case E_Anonymous_Access_Subprogram_Type:
3211 /* If we are not defining this entity, and we have incomplete
3212 entities being processed above us, make a dummy type and
3213 fill it in later. */
3214 if (!definition && defer_incomplete_level != 0)
3216 struct incomplete *p
3217 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3220 = build_pointer_type
3221 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3222 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3223 !Comes_From_Source (gnat_entity),
3224 debug_info_p, gnat_entity);
3225 this_made_decl = true;
3226 gnu_type = TREE_TYPE (gnu_decl);
3227 save_gnu_tree (gnat_entity, gnu_decl, false);
3230 p->old_type = TREE_TYPE (gnu_type);
3231 p->full_type = Directly_Designated_Type (gnat_entity);
3232 p->next = defer_incomplete_list;
3233 defer_incomplete_list = p;
3237 /* ... fall through ... */
3239 case E_Allocator_Type:
3241 case E_Access_Attribute_Type:
3242 case E_Anonymous_Access_Type:
3243 case E_General_Access_Type:
3245 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3246 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3247 bool is_from_limited_with
3248 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3249 && From_With_Type (gnat_desig_equiv));
3251 /* Get the "full view" of this entity. If this is an incomplete
3252 entity from a limited with, treat its non-limited view as the full
3253 view. Otherwise, if this is an incomplete or private type, use the
3254 full view. In the former case, we might point to a private type,
3255 in which case, we need its full view. Also, we want to look at the
3256 actual type used for the representation, so this takes a total of
3258 Entity_Id gnat_desig_full_direct_first
3259 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3260 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3261 ? Full_View (gnat_desig_equiv) : Empty));
3262 Entity_Id gnat_desig_full_direct
3263 = ((is_from_limited_with
3264 && Present (gnat_desig_full_direct_first)
3265 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3266 ? Full_View (gnat_desig_full_direct_first)
3267 : gnat_desig_full_direct_first);
3268 Entity_Id gnat_desig_full
3269 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3271 /* This the type actually used to represent the designated type,
3272 either gnat_desig_full or gnat_desig_equiv. */
3273 Entity_Id gnat_desig_rep;
3275 /* Nonzero if this is a pointer to an unconstrained array. */
3276 bool is_unconstrained_array;
3278 /* We want to know if we'll be seeing the freeze node for any
3279 incomplete type we may be pointing to. */
3281 = (Present (gnat_desig_full)
3282 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3283 : In_Extended_Main_Code_Unit (gnat_desig_type));
3285 /* Nonzero if we make a dummy type here. */
3286 bool got_fat_p = false;
3287 /* Nonzero if the dummy is a fat pointer. */
3288 bool made_dummy = false;
3289 tree gnu_desig_type = NULL_TREE;
3290 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3292 if (!targetm.valid_pointer_mode (p_mode))
3295 /* If either the designated type or its full view is an unconstrained
3296 array subtype, replace it with the type it's a subtype of. This
3297 avoids problems with multiple copies of unconstrained array types.
3298 Likewise, if the designated type is a subtype of an incomplete
3299 record type, use the parent type to avoid order of elaboration
3300 issues. This can lose some code efficiency, but there is no
3302 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3303 && ! Is_Constrained (gnat_desig_equiv))
3304 gnat_desig_equiv = Etype (gnat_desig_equiv);
3305 if (Present (gnat_desig_full)
3306 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3307 && ! Is_Constrained (gnat_desig_full))
3308 || (Ekind (gnat_desig_full) == E_Record_Subtype
3309 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3310 gnat_desig_full = Etype (gnat_desig_full);
3312 /* Now set the type that actually marks the representation of
3313 the designated type and also flag whether we have a unconstrained
3315 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3316 is_unconstrained_array
3317 = (Is_Array_Type (gnat_desig_rep)
3318 && ! Is_Constrained (gnat_desig_rep));
3320 /* If we are pointing to an incomplete type whose completion is an
3321 unconstrained array, make a fat pointer type. The two types in our
3322 fields will be pointers to dummy nodes and will be replaced in
3323 update_pointer_to. Similarly, if the type itself is a dummy type or
3324 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3325 in case we have any thin pointers to it. */
3326 if (is_unconstrained_array
3327 && (Present (gnat_desig_full)
3328 || (present_gnu_tree (gnat_desig_equiv)
3329 && TYPE_IS_DUMMY_P (TREE_TYPE
3330 (get_gnu_tree (gnat_desig_equiv))))
3331 || (No (gnat_desig_full) && ! in_main_unit
3332 && defer_incomplete_level != 0
3333 && ! present_gnu_tree (gnat_desig_equiv))
3334 || (in_main_unit && is_from_limited_with
3335 && Present (Freeze_Node (gnat_desig_rep)))))
3338 = (present_gnu_tree (gnat_desig_rep)
3339 ? TREE_TYPE (get_gnu_tree (gnat_desig_rep))
3340 : make_dummy_type (gnat_desig_rep));
3343 /* Show the dummy we get will be a fat pointer. */
3344 got_fat_p = made_dummy = true;
3346 /* If the call above got something that has a pointer, that
3347 pointer is our type. This could have happened either
3348 because the type was elaborated or because somebody
3349 else executed the code below. */
3350 gnu_type = TYPE_POINTER_TO (gnu_old);
3353 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3354 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3355 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3356 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3358 TYPE_NAME (gnu_template_type)
3359 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3361 TYPE_DUMMY_P (gnu_template_type) = 1;
3363 TYPE_NAME (gnu_array_type)
3364 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3366 TYPE_DUMMY_P (gnu_array_type) = 1;
3368 gnu_type = make_node (RECORD_TYPE);
3369 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3370 TYPE_POINTER_TO (gnu_old) = gnu_type;
3372 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3374 = chainon (chainon (NULL_TREE,
3376 (get_identifier ("P_ARRAY"),
3378 gnu_type, 0, 0, 0, 0)),
3379 create_field_decl (get_identifier ("P_BOUNDS"),
3381 gnu_type, 0, 0, 0, 0));
3383 /* Make sure we can place this into a register. */
3384 TYPE_ALIGN (gnu_type)
3385 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3386 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3388 /* Do not finalize this record type since the types of
3389 its fields are incomplete. */
3390 finish_record_type (gnu_type, fields, 0, true);
3392 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3393 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3394 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3396 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3400 /* If we already know what the full type is, use it. */
3401 else if (Present (gnat_desig_full)
3402 && present_gnu_tree (gnat_desig_full))
3403 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3405 /* Get the type of the thing we are to point to and build a pointer
3406 to it. If it is a reference to an incomplete or private type with a
3407 full view that is a record, make a dummy type node and get the
3408 actual type later when we have verified it is safe. */
3409 else if ((! in_main_unit
3410 && ! present_gnu_tree (gnat_desig_equiv)
3411 && Present (gnat_desig_full)
3412 && ! present_gnu_tree (gnat_desig_full)
3413 && Is_Record_Type (gnat_desig_full))
3414 /* Likewise if we are pointing to a record or array and we
3415 are to defer elaborating incomplete types. We do this
3416 since this access type may be the full view of some
3417 private type. Note that the unconstrained array case is
3419 || ((! in_main_unit || imported_p)
3420 && defer_incomplete_level != 0
3421 && ! present_gnu_tree (gnat_desig_equiv)
3422 && ((Is_Record_Type (gnat_desig_rep)
3423 || Is_Array_Type (gnat_desig_rep))))
3424 /* If this is a reference from a limited_with type back to our
3425 main unit and there's a Freeze_Node for it, either we have
3426 already processed the declaration and made the dummy type,
3427 in which case we just reuse the latter, or we have not yet,
3428 in which case we make the dummy type and it will be reused
3429 when the declaration is processed. In both cases, the
3430 pointer eventually created below will be automatically
3431 adjusted when the Freeze_Node is processed. Note that the
3432 unconstrained array case is handled above. */
3433 || (in_main_unit && is_from_limited_with
3434 && Present (Freeze_Node (gnat_desig_rep))))
3436 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3440 /* Otherwise handle the case of a pointer to itself. */
3441 else if (gnat_desig_equiv == gnat_entity)
3444 = build_pointer_type_for_mode (void_type_node, p_mode,
3445 No_Strict_Aliasing (gnat_entity));
3446 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3449 /* If expansion is disabled, the equivalent type of a concurrent
3450 type is absent, so build a dummy pointer type. */
3451 else if (type_annotate_only && No (gnat_desig_equiv))
3452 gnu_type = ptr_void_type_node;
3454 /* Finally, handle the straightforward case where we can just
3455 elaborate our designated type and point to it. */
3457 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3459 /* It is possible that a call to gnat_to_gnu_type above resolved our
3460 type. If so, just return it. */
3461 if (present_gnu_tree (gnat_entity))
3463 maybe_present = true;
3467 /* If we have a GCC type for the designated type, possibly modify it
3468 if we are pointing only to constant objects and then make a pointer
3469 to it. Don't do this for unconstrained arrays. */
3470 if (!gnu_type && gnu_desig_type)
3472 if (Is_Access_Constant (gnat_entity)
3473 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3476 = build_qualified_type
3478 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3480 /* Some extra processing is required if we are building a
3481 pointer to an incomplete type (in the GCC sense). We might
3482 have such a type if we just made a dummy, or directly out
3483 of the call to gnat_to_gnu_type above if we are processing
3484 an access type for a record component designating the
3485 record type itself. */
3486 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3488 /* We must ensure that the pointer to variant we make will
3489 be processed by update_pointer_to when the initial type
3490 is completed. Pretend we made a dummy and let further
3491 processing act as usual. */
3494 /* We must ensure that update_pointer_to will not retrieve
3495 the dummy variant when building a properly qualified
3496 version of the complete type. We take advantage of the
3497 fact that get_qualified_type is requiring TYPE_NAMEs to
3498 match to influence build_qualified_type and then also
3499 update_pointer_to here. */
3500 TYPE_NAME (gnu_desig_type)
3501 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3506 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3507 No_Strict_Aliasing (gnat_entity));
3510 /* If we are not defining this object and we made a dummy pointer,
3511 save our current definition, evaluate the actual type, and replace
3512 the tentative type we made with the actual one. If we are to defer
3513 actually looking up the actual type, make an entry in the
3514 deferred list. If this is from a limited with, we have to defer
3515 to the end of the current spec in two cases: first if the
3516 designated type is in the current unit and second if the access
3518 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3521 = TYPE_FAT_POINTER_P (gnu_type)
3522 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3524 if (esize == POINTER_SIZE
3525 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3527 = build_pointer_type
3528 (TYPE_OBJECT_RECORD_TYPE
3529 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3531 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3532 !Comes_From_Source (gnat_entity),
3533 debug_info_p, gnat_entity);
3534 this_made_decl = true;
3535 gnu_type = TREE_TYPE (gnu_decl);
3536 save_gnu_tree (gnat_entity, gnu_decl, false);
3539 if (defer_incomplete_level == 0
3540 && ! (is_from_limited_with
3542 || In_Extended_Main_Code_Unit (gnat_entity))))
3543 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3544 gnat_to_gnu_type (gnat_desig_equiv));
3546 /* Note that the call to gnat_to_gnu_type here might have
3547 updated gnu_old_type directly, in which case it is not a
3548 dummy type any more when we get into update_pointer_to.
3550 This may happen for instance when the designated type is a
3551 record type, because their elaboration starts with an
3552 initial node from make_dummy_type, which may yield the same
3553 node as the one we got.
3555 Besides, variants of this non-dummy type might have been
3556 created along the way. update_pointer_to is expected to
3557 properly take care of those situations. */
3560 struct incomplete *p
3561 = (struct incomplete *) xmalloc (sizeof
3562 (struct incomplete));
3563 struct incomplete **head
3564 = (is_from_limited_with
3566 || In_Extended_Main_Code_Unit (gnat_entity))
3567 ? &defer_limited_with : &defer_incomplete_list);
3569 p->old_type = gnu_old_type;
3570 p->full_type = gnat_desig_equiv;
3578 case E_Access_Protected_Subprogram_Type:
3579 case E_Anonymous_Access_Protected_Subprogram_Type:
3580 if (type_annotate_only && No (gnat_equiv_type))
3581 gnu_type = ptr_void_type_node;
3584 /* The runtime representation is the equivalent type. */
3585 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3589 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3590 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3591 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3592 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3593 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3598 case E_Access_Subtype:
3600 /* We treat this as identical to its base type; any constraint is
3601 meaningful only to the front end.
3603 The designated type must be elaborated as well, if it does
3604 not have its own freeze node. Designated (sub)types created
3605 for constrained components of records with discriminants are
3606 not frozen by the front end and thus not elaborated by gigi,
3607 because their use may appear before the base type is frozen,
3608 and because it is not clear that they are needed anywhere in
3609 Gigi. With the current model, there is no correct place where
3610 they could be elaborated. */
3612 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3613 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3614 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3615 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3616 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3618 /* If we are not defining this entity, and we have incomplete
3619 entities being processed above us, make a dummy type and
3620 elaborate it later. */
3621 if (!definition && defer_incomplete_level != 0)
3623 struct incomplete *p
3624 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3626 = build_pointer_type
3627 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3629 p->old_type = TREE_TYPE (gnu_ptr_type);
3630 p->full_type = Directly_Designated_Type (gnat_entity);
3631 p->next = defer_incomplete_list;
3632 defer_incomplete_list = p;
3634 else if (!IN (Ekind (Base_Type
3635 (Directly_Designated_Type (gnat_entity))),
3636 Incomplete_Or_Private_Kind))
3637 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3641 maybe_present = true;
3644 /* Subprogram Entities
3646 The following access functions are defined for subprograms (functions
3649 First_Formal The first formal parameter.
3650 Is_Imported Indicates that the subprogram has appeared in
3651 an INTERFACE or IMPORT pragma. For now we
3652 assume that the external language is C.
3653 Is_Exported Likewise but for an EXPORT pragma.
3654 Is_Inlined True if the subprogram is to be inlined.
3656 In addition for function subprograms we have:
3658 Etype Return type of the function.
3660 Each parameter is first checked by calling must_pass_by_ref on its
3661 type to determine if it is passed by reference. For parameters which
3662 are copied in, if they are Ada In Out or Out parameters, their return
3663 value becomes part of a record which becomes the return type of the
3664 function (C function - note that this applies only to Ada procedures
3665 so there is no Ada return type). Additional code to store back the
3666 parameters will be generated on the caller side. This transformation
3667 is done here, not in the front-end.
3669 The intended result of the transformation can be seen from the
3670 equivalent source rewritings that follow:
3672 struct temp {int a,b};
3673 procedure P (A,B: In Out ...) is temp P (int A,B)
3676 end P; return {A,B};
3683 For subprogram types we need to perform mainly the same conversions to
3684 GCC form that are needed for procedures and function declarations. The
3685 only difference is that at the end, we make a type declaration instead
3686 of a function declaration. */
3688 case E_Subprogram_Type:
3692 /* The first GCC parameter declaration (a PARM_DECL node). The
3693 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3694 actually is the head of this parameter list. */
3695 tree gnu_param_list = NULL_TREE;
3696 /* Likewise for the stub associated with an exported procedure. */
3697 tree gnu_stub_param_list = NULL_TREE;
3698 /* The type returned by a function. If the subprogram is a procedure
3699 this type should be void_type_node. */
3700 tree gnu_return_type = void_type_node;
3701 /* List of fields in return type of procedure with copy-in copy-out
3703 tree gnu_field_list = NULL_TREE;
3704 /* Non-null for subprograms containing parameters passed by copy-in
3705 copy-out (Ada In Out or Out parameters not passed by reference),
3706 in which case it is the list of nodes used to specify the values of
3707 the in out/out parameters that are returned as a record upon
3708 procedure return. The TREE_PURPOSE of an element of this list is
3709 a field of the record and the TREE_VALUE is the PARM_DECL
3710 corresponding to that field. This list will be saved in the
3711 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3712 tree gnu_return_list = NULL_TREE;
3713 /* If an import pragma asks to map this subprogram to a GCC builtin,
3714 this is the builtin DECL node. */
3715 tree gnu_builtin_decl = NULL_TREE;
3716 /* For the stub associated with an exported procedure. */
3717 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3718 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3719 Entity_Id gnat_param;
3720 bool inline_flag = Is_Inlined (gnat_entity);
3721 bool public_flag = Is_Public (gnat_entity) || imported_p;
3723 = (Is_Public (gnat_entity) && !definition) || imported_p;
3724 bool pure_flag = Is_Pure (gnat_entity);
3725 bool volatile_flag = No_Return (gnat_entity);
3726 bool returns_by_ref = false;
3727 bool returns_unconstrained = false;
3728 bool returns_by_target_ptr = false;
3729 bool has_copy_in_out = false;
3730 bool has_stub = false;
3733 if (kind == E_Subprogram_Type && !definition)
3734 /* A parameter may refer to this type, so defer completion
3735 of any incomplete types. */
3736 defer_incomplete_level++, this_deferred = true;
3738 /* If the subprogram has an alias, it is probably inherited, so
3739 we can use the original one. If the original "subprogram"
3740 is actually an enumeration literal, it may be the first use
3741 of its type, so we must elaborate that type now. */
3742 if (Present (Alias (gnat_entity)))
3744 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3745 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3747 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3750 /* Elaborate any Itypes in the parameters of this entity. */
3751 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3752 Present (gnat_temp);
3753 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3754 if (Is_Itype (Etype (gnat_temp)))
3755 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3760 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3761 corresponding DECL node.
3763 We still want the parameter associations to take place because the
3764 proper generation of calls depends on it (a GNAT parameter without
3765 a corresponding GCC tree has a very specific meaning), so we don't
3767 if (Convention (gnat_entity) == Convention_Intrinsic)
3768 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3770 /* ??? What if we don't find the builtin node above ? warn ? err ?
3771 In the current state we neither warn nor err, and calls will just
3772 be handled as for regular subprograms. */
3774 if (kind == E_Function || kind == E_Subprogram_Type)
3775 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3777 /* If this function returns by reference, make the actual
3778 return type of this function the pointer and mark the decl. */
3779 if (Returns_By_Ref (gnat_entity))
3781 returns_by_ref = true;
3782 gnu_return_type = build_pointer_type (gnu_return_type);
3785 /* If the Mechanism is By_Reference, ensure the return type uses
3786 the machine's by-reference mechanism, which may not the same
3787 as above (e.g., it might be by passing a fake parameter). */
3788 else if (kind == E_Function
3789 && Mechanism (gnat_entity) == By_Reference)
3791 TREE_ADDRESSABLE (gnu_return_type) = 1;
3793 /* We expect this bit to be reset by gigi shortly, so can avoid a
3794 type node copy here. This actually also prevents troubles with
3795 the generation of debug information for the function, because
3796 we might have issued such info for this type already, and would
3797 be attaching a distinct type node to the function if we made a
3801 /* If we are supposed to return an unconstrained array,
3802 actually return a fat pointer and make a note of that. Return
3803 a pointer to an unconstrained record of variable size. */
3804 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3806 gnu_return_type = TREE_TYPE (gnu_return_type);
3807 returns_unconstrained = true;
3810 /* If the type requires a transient scope, the result is allocated
3811 on the secondary stack, so the result type of the function is
3813 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3815 gnu_return_type = build_pointer_type (gnu_return_type);
3816 returns_unconstrained = true;
3819 /* If the type is a padded type and the underlying type would not
3820 be passed by reference or this function has a foreign convention,
3821 return the underlying type. */
3822 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3823 && TYPE_IS_PADDING_P (gnu_return_type)
3824 && (!default_pass_by_ref (TREE_TYPE
3825 (TYPE_FIELDS (gnu_return_type)))
3826 || Has_Foreign_Convention (gnat_entity)))
3827 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3829 /* If the return type has a non-constant size, we convert the function
3830 into a procedure and its caller will pass a pointer to an object as
3831 the first parameter when we call the function. This can happen for
3832 an unconstrained type with a maximum size or a constrained type with
3833 a size not known at compile time. */
3834 if (TYPE_SIZE_UNIT (gnu_return_type)
3835 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
3837 returns_by_target_ptr = true;
3839 = create_param_decl (get_identifier ("TARGET"),
3840 build_reference_type (gnu_return_type),
3842 gnu_return_type = void_type_node;
3845 /* If the return type has a size that overflows, we cannot have
3846 a function that returns that type. This usage doesn't make
3847 sense anyway, so give an error here. */
3848 if (TYPE_SIZE_UNIT (gnu_return_type)
3849 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3850 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3852 post_error ("cannot return type whose size overflows",
3854 gnu_return_type = copy_node (gnu_return_type);
3855 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3856 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3857 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3858 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3861 /* Look at all our parameters and get the type of
3862 each. While doing this, build a copy-out structure if
3865 /* Loop over the parameters and get their associated GCC tree.
3866 While doing this, build a copy-out structure if we need one. */
3867 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
3868 Present (gnat_param);
3869 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3871 tree gnu_param_name = get_entity_name (gnat_param);
3872 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3873 tree gnu_param, gnu_field;
3874 bool copy_in_copy_out = false;
3875 Mechanism_Type mech = Mechanism (gnat_param);
3877 /* Builtins are expanded inline and there is no real call sequence
3878 involved. So the type expected by the underlying expander is
3879 always the type of each argument "as is". */
3880 if (gnu_builtin_decl)
3882 /* Handle the first parameter of a valued procedure specially. */
3883 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3884 mech = By_Copy_Return;
3885 /* Otherwise, see if a Mechanism was supplied that forced this
3886 parameter to be passed one way or another. */
3887 else if (mech == Default
3888 || mech == By_Copy || mech == By_Reference)
3890 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
3891 mech = By_Descriptor;
3893 else if (By_Short_Descriptor_Last <= mech &&
3894 mech <= By_Short_Descriptor)
3895 mech = By_Short_Descriptor;
3899 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
3900 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
3901 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
3903 mech = By_Reference;
3909 post_error ("unsupported mechanism for&", gnat_param);
3914 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
3915 Has_Foreign_Convention (gnat_entity),
3918 /* We are returned either a PARM_DECL or a type if no parameter
3919 needs to be passed; in either case, adjust the type. */
3920 if (DECL_P (gnu_param))
3921 gnu_param_type = TREE_TYPE (gnu_param);
3924 gnu_param_type = gnu_param;
3925 gnu_param = NULL_TREE;
3930 /* If it's an exported subprogram, we build a parameter list
3931 in parallel, in case we need to emit a stub for it. */
3932 if (Is_Exported (gnat_entity))
3935 = chainon (gnu_param, gnu_stub_param_list);
3936 /* Change By_Descriptor parameter to By_Reference for
3937 the internal version of an exported subprogram. */
3938 if (mech == By_Descriptor || mech == By_Short_Descriptor)
3941 = gnat_to_gnu_param (gnat_param, By_Reference,
3947 gnu_param = copy_node (gnu_param);
3950 gnu_param_list = chainon (gnu_param, gnu_param_list);
3951 Sloc_to_locus (Sloc (gnat_param),
3952 &DECL_SOURCE_LOCATION (gnu_param));
3953 save_gnu_tree (gnat_param, gnu_param, false);
3955 /* If a parameter is a pointer, this function may modify
3956 memory through it and thus shouldn't be considered
3957 a pure function. Also, the memory may be modified
3958 between two calls, so they can't be CSE'ed. The latter
3959 case also handles by-ref parameters. */
3960 if (POINTER_TYPE_P (gnu_param_type)
3961 || TYPE_FAT_POINTER_P (gnu_param_type))
3965 if (copy_in_copy_out)
3967 if (!has_copy_in_out)
3969 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
3970 gnu_return_type = make_node (RECORD_TYPE);
3971 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
3972 has_copy_in_out = true;
3975 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
3976 gnu_return_type, 0, 0, 0, 0);
3977 Sloc_to_locus (Sloc (gnat_param),
3978 &DECL_SOURCE_LOCATION (gnu_field));
3979 TREE_CHAIN (gnu_field) = gnu_field_list;
3980 gnu_field_list = gnu_field;
3981 gnu_return_list = tree_cons (gnu_field, gnu_param,
3986 /* Do not compute record for out parameters if subprogram is
3987 stubbed since structures are incomplete for the back-end. */
3988 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
3989 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
3992 /* If we have a CICO list but it has only one entry, we convert
3993 this function into a function that simply returns that one
3995 if (list_length (gnu_return_list) == 1)
3996 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
3998 if (Has_Stdcall_Convention (gnat_entity))
3999 prepend_one_attribute_to
4000 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4001 get_identifier ("stdcall"), NULL_TREE,
4004 /* If we are on a target where stack realignment is needed for 'main'
4005 to honor GCC's implicit expectations (stack alignment greater than
4006 what the base ABI guarantees), ensure we do the same for foreign
4007 convention subprograms as they might be used as callbacks from code
4008 breaking such expectations. Note that this applies to task entry
4009 points in particular. */
4010 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4011 && Has_Foreign_Convention (gnat_entity))
4012 prepend_one_attribute_to
4013 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4014 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4017 /* The lists have been built in reverse. */
4018 gnu_param_list = nreverse (gnu_param_list);
4020 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4021 gnu_return_list = nreverse (gnu_return_list);
4023 if (Ekind (gnat_entity) == E_Function)
4024 Set_Mechanism (gnat_entity,
4025 (returns_by_ref || returns_unconstrained
4026 ? By_Reference : By_Copy));
4028 = create_subprog_type (gnu_return_type, gnu_param_list,
4029 gnu_return_list, returns_unconstrained,
4030 returns_by_ref, returns_by_target_ptr);
4034 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4035 gnu_return_list, returns_unconstrained,
4036 returns_by_ref, returns_by_target_ptr);
4038 /* A subprogram (something that doesn't return anything) shouldn't
4039 be considered Pure since there would be no reason for such a
4040 subprogram. Note that procedures with Out (or In Out) parameters
4041 have already been converted into a function with a return type. */
4042 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4045 /* The semantics of "pure" in Ada used to essentially match that of
4046 "const" in the middle-end. In particular, both properties were
4047 orthogonal to the "nothrow" property. This is not true in the
4048 middle-end any more and we have no choice but to ignore the hint
4052 = build_qualified_type (gnu_type,
4053 TYPE_QUALS (gnu_type)
4054 | (TYPE_QUAL_VOLATILE * volatile_flag));
4056 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4060 = build_qualified_type (gnu_stub_type,
4061 TYPE_QUALS (gnu_stub_type)
4062 | (Exception_Mechanism == Back_End_Exceptions
4063 ? TYPE_QUAL_CONST * pure_flag : 0)
4064 | (TYPE_QUAL_VOLATILE * volatile_flag));
4066 /* If we have a builtin decl for that function, check the signatures
4067 compatibilities. If the signatures are compatible, use the builtin
4068 decl. If they are not, we expect the checker predicate to have
4069 posted the appropriate errors, and just continue with what we have
4071 if (gnu_builtin_decl)
4073 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4075 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4077 gnu_decl = gnu_builtin_decl;
4078 gnu_type = gnu_builtin_type;
4083 /* If there was no specified Interface_Name and the external and
4084 internal names of the subprogram are the same, only use the
4085 internal name to allow disambiguation of nested subprograms. */
4086 if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_id)
4087 gnu_ext_name = NULL_TREE;
4089 /* If we are defining the subprogram and it has an Address clause
4090 we must get the address expression from the saved GCC tree for the
4091 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4092 the address expression here since the front-end has guaranteed
4093 in that case that the elaboration has no effects. If there is
4094 an Address clause and we are not defining the object, just
4095 make it a constant. */
4096 if (Present (Address_Clause (gnat_entity)))
4098 tree gnu_address = NULL_TREE;
4102 = (present_gnu_tree (gnat_entity)
4103 ? get_gnu_tree (gnat_entity)
4104 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4106 save_gnu_tree (gnat_entity, NULL_TREE, false);
4108 /* Convert the type of the object to a reference type that can
4109 alias everything as per 13.3(19). */
4111 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4113 gnu_address = convert (gnu_type, gnu_address);
4116 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
4117 gnu_address, false, Is_Public (gnat_entity),
4118 extern_flag, false, NULL, gnat_entity);
4119 DECL_BY_REF_P (gnu_decl) = 1;
4122 else if (kind == E_Subprogram_Type)
4123 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4124 !Comes_From_Source (gnat_entity),
4125 debug_info_p, gnat_entity);
4130 gnu_stub_name = gnu_ext_name;
4131 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4132 public_flag = false;
4135 gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name,
4136 gnu_type, gnu_param_list,
4137 inline_flag, public_flag,
4138 extern_flag, attr_list,
4143 = create_subprog_decl (gnu_entity_id, gnu_stub_name,
4144 gnu_stub_type, gnu_stub_param_list,
4146 extern_flag, attr_list,
4148 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4151 /* This is unrelated to the stub built right above. */
4152 DECL_STUBBED_P (gnu_decl)
4153 = Convention (gnat_entity) == Convention_Stubbed;
4158 case E_Incomplete_Type:
4159 case E_Incomplete_Subtype:
4160 case E_Private_Type:
4161 case E_Private_Subtype:
4162 case E_Limited_Private_Type:
4163 case E_Limited_Private_Subtype:
4164 case E_Record_Type_With_Private:
4165 case E_Record_Subtype_With_Private:
4167 /* Get the "full view" of this entity. If this is an incomplete
4168 entity from a limited with, treat its non-limited view as the
4169 full view. Otherwise, use either the full view or the underlying
4170 full view, whichever is present. This is used in all the tests
4173 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4174 && From_With_Type (gnat_entity))
4175 ? Non_Limited_View (gnat_entity)
4176 : Present (Full_View (gnat_entity))
4177 ? Full_View (gnat_entity)
4178 : Underlying_Full_View (gnat_entity);
4180 /* If this is an incomplete type with no full view, it must be a Taft
4181 Amendment type, in which case we return a dummy type. Otherwise,
4182 just get the type from its Etype. */
4185 if (kind == E_Incomplete_Type)
4186 gnu_type = make_dummy_type (gnat_entity);
4189 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4191 maybe_present = true;
4196 /* If we already made a type for the full view, reuse it. */
4197 else if (present_gnu_tree (full_view))
4199 gnu_decl = get_gnu_tree (full_view);
4203 /* Otherwise, if we are not defining the type now, get the type
4204 from the full view. But always get the type from the full view
4205 for define on use types, since otherwise we won't see them! */
4206 else if (!definition
4207 || (Is_Itype (full_view)
4208 && No (Freeze_Node (gnat_entity)))
4209 || (Is_Itype (gnat_entity)
4210 && No (Freeze_Node (full_view))))
4212 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4213 maybe_present = true;
4217 /* For incomplete types, make a dummy type entry which will be
4219 gnu_type = make_dummy_type (gnat_entity);
4221 /* Save this type as the full declaration's type so we can do any
4222 needed updates when we see it. */
4223 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4224 !Comes_From_Source (gnat_entity),
4225 debug_info_p, gnat_entity);
4226 save_gnu_tree (full_view, gnu_decl, 0);
4230 /* Simple class_wide types are always viewed as their root_type
4231 by Gigi unless an Equivalent_Type is specified. */
4232 case E_Class_Wide_Type:
4233 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4234 maybe_present = true;
4238 case E_Task_Subtype:
4239 case E_Protected_Type:
4240 case E_Protected_Subtype:
4241 if (type_annotate_only && No (gnat_equiv_type))
4242 gnu_type = void_type_node;
4244 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4246 maybe_present = true;
4250 gnu_decl = create_label_decl (gnu_entity_id);
4255 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4256 we've already saved it, so we don't try to. */
4257 gnu_decl = error_mark_node;
4265 /* If we had a case where we evaluated another type and it might have
4266 defined this one, handle it here. */
4267 if (maybe_present && present_gnu_tree (gnat_entity))
4269 gnu_decl = get_gnu_tree (gnat_entity);
4273 /* If we are processing a type and there is either no decl for it or
4274 we just made one, do some common processing for the type, such as
4275 handling alignment and possible padding. */
4277 if ((!gnu_decl || this_made_decl) && IN (kind, Type_Kind))
4279 if (Is_Tagged_Type (gnat_entity)
4280 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4281 TYPE_ALIGN_OK (gnu_type) = 1;
4283 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4284 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4286 /* ??? Don't set the size for a String_Literal since it is either
4287 confirming or we don't handle it properly (if the low bound is
4289 if (!gnu_size && kind != E_String_Literal_Subtype)
4290 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4292 Has_Size_Clause (gnat_entity));
4294 /* If a size was specified, see if we can make a new type of that size
4295 by rearranging the type, for example from a fat to a thin pointer. */
4299 = make_type_from_size (gnu_type, gnu_size,
4300 Has_Biased_Representation (gnat_entity));
4302 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4303 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4307 /* If the alignment hasn't already been processed and this is
4308 not an unconstrained array, see if an alignment is specified.
4309 If not, we pick a default alignment for atomic objects. */
4310 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4312 else if (Known_Alignment (gnat_entity))
4314 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4315 TYPE_ALIGN (gnu_type));
4317 /* Warn on suspiciously large alignments. This should catch
4318 errors about the (alignment,byte)/(size,bit) discrepancy. */
4319 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4323 /* If a size was specified, take it into account. Otherwise
4324 use the RM size for records as the type size has already
4325 been adjusted to the alignment. */
4328 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4329 || TREE_CODE (gnu_type) == UNION_TYPE
4330 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4331 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4332 size = rm_size (gnu_type);
4334 size = TYPE_SIZE (gnu_type);
4336 /* Consider an alignment as suspicious if the alignment/size
4337 ratio is greater or equal to the byte/bit ratio. */
4338 if (host_integerp (size, 1)
4339 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4340 post_error_ne ("?suspiciously large alignment specified for&",
4341 Expression (Alignment_Clause (gnat_entity)),
4345 else if (Is_Atomic (gnat_entity) && !gnu_size
4346 && host_integerp (TYPE_SIZE (gnu_type), 1)
4347 && integer_pow2p (TYPE_SIZE (gnu_type)))
4348 align = MIN (BIGGEST_ALIGNMENT,
4349 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4350 else if (Is_Atomic (gnat_entity) && gnu_size
4351 && host_integerp (gnu_size, 1)
4352 && integer_pow2p (gnu_size))
4353 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4355 /* See if we need to pad the type. If we did, and made a record,
4356 the name of the new type may be changed. So get it back for
4357 us when we make the new TYPE_DECL below. */
4358 if (gnu_size || align > 0)
4359 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4360 "PAD", true, definition, false);
4362 if (TREE_CODE (gnu_type) == RECORD_TYPE
4363 && TYPE_IS_PADDING_P (gnu_type))
4365 gnu_entity_id = TYPE_NAME (gnu_type);
4366 if (TREE_CODE (gnu_entity_id) == TYPE_DECL)
4367 gnu_entity_id = DECL_NAME (gnu_entity_id);
4370 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4372 /* If we are at global level, GCC will have applied variable_size to
4373 the type, but that won't have done anything. So, if it's not
4374 a constant or self-referential, call elaborate_expression_1 to
4375 make a variable for the size rather than calculating it each time.
4376 Handle both the RM size and the actual size. */
4377 if (global_bindings_p ()
4378 && TYPE_SIZE (gnu_type)
4379 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4380 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4382 if (TREE_CODE (gnu_type) == RECORD_TYPE
4383 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4384 TYPE_SIZE (gnu_type), 0))
4386 TYPE_SIZE (gnu_type)
4387 = elaborate_expression_1 (gnat_entity, gnat_entity,
4388 TYPE_SIZE (gnu_type),
4389 get_identifier ("SIZE"),
4391 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4395 TYPE_SIZE (gnu_type)
4396 = elaborate_expression_1 (gnat_entity, gnat_entity,
4397 TYPE_SIZE (gnu_type),
4398 get_identifier ("SIZE"),
4401 /* ??? For now, store the size as a multiple of the alignment
4402 in bytes so that we can see the alignment from the tree. */
4403 TYPE_SIZE_UNIT (gnu_type)
4405 (MULT_EXPR, sizetype,
4406 elaborate_expression_1
4407 (gnat_entity, gnat_entity,
4408 build_binary_op (EXACT_DIV_EXPR, sizetype,
4409 TYPE_SIZE_UNIT (gnu_type),
4410 size_int (TYPE_ALIGN (gnu_type)
4412 get_identifier ("SIZE_A_UNIT"),
4414 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4416 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4419 elaborate_expression_1 (gnat_entity,
4421 TYPE_ADA_SIZE (gnu_type),
4422 get_identifier ("RM_SIZE"),
4427 /* If this is a record type or subtype, call elaborate_expression_1 on
4428 any field position. Do this for both global and local types.
4429 Skip any fields that we haven't made trees for to avoid problems with
4430 class wide types. */
4431 if (IN (kind, Record_Kind))
4432 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4433 gnat_temp = Next_Entity (gnat_temp))
4434 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4436 tree gnu_field = get_gnu_tree (gnat_temp);
4438 /* ??? Unfortunately, GCC needs to be able to prove the
4439 alignment of this offset and if it's a variable, it can't.
4440 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4441 right now, we have to put in an explicit multiply and
4442 divide by that value. */
4443 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4445 DECL_FIELD_OFFSET (gnu_field)
4447 (MULT_EXPR, sizetype,
4448 elaborate_expression_1
4449 (gnat_temp, gnat_temp,
4450 build_binary_op (EXACT_DIV_EXPR, sizetype,
4451 DECL_FIELD_OFFSET (gnu_field),
4452 size_int (DECL_OFFSET_ALIGN (gnu_field)
4454 get_identifier ("OFFSET"),
4456 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4458 /* ??? The context of gnu_field is not necessarily gnu_type so
4459 the MULT_EXPR node built above may not be marked by the call
4460 to create_type_decl below. */
4461 if (global_bindings_p ())
4462 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4466 gnu_type = build_qualified_type (gnu_type,
4467 (TYPE_QUALS (gnu_type)
4468 | (TYPE_QUAL_VOLATILE
4469 * Treat_As_Volatile (gnat_entity))));
4471 if (Is_Atomic (gnat_entity))
4472 check_ok_for_atomic (gnu_type, gnat_entity, false);
4474 if (Present (Alignment_Clause (gnat_entity)))
4475 TYPE_USER_ALIGN (gnu_type) = 1;
4477 if (Universal_Aliasing (gnat_entity))
4478 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4481 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4482 !Comes_From_Source (gnat_entity),
4483 debug_info_p, gnat_entity);
4485 TREE_TYPE (gnu_decl) = gnu_type;
4488 if (IN (kind, Type_Kind) && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4490 gnu_type = TREE_TYPE (gnu_decl);
4492 /* Back-annotate the Alignment of the type if not already in the
4493 tree. Likewise for sizes. */
4494 if (Unknown_Alignment (gnat_entity))
4495 Set_Alignment (gnat_entity,
4496 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4498 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4500 /* If the size is self-referential, we annotate the maximum
4501 value of that size. */
4502 tree gnu_size = TYPE_SIZE (gnu_type);
4504 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4505 gnu_size = max_size (gnu_size, true);
4507 Set_Esize (gnat_entity, annotate_value (gnu_size));
4509 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4511 /* In this mode the tag and the parent components are not
4512 generated by the front-end, so the sizes must be adjusted
4514 int size_offset, new_size;
4516 if (Is_Derived_Type (gnat_entity))
4519 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4520 Set_Alignment (gnat_entity,
4521 Alignment (Etype (Base_Type (gnat_entity))));
4524 size_offset = POINTER_SIZE;
4526 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4527 Set_Esize (gnat_entity,
4528 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4529 / POINTER_SIZE) * POINTER_SIZE));
4530 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4534 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4535 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4538 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4539 DECL_ARTIFICIAL (gnu_decl) = 1;
4541 if (!debug_info_p && DECL_P (gnu_decl)
4542 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4543 && No (Renamed_Object (gnat_entity)))
4544 DECL_IGNORED_P (gnu_decl) = 1;
4546 /* If we haven't already, associate the ..._DECL node that we just made with
4547 the input GNAT entity node. */
4549 save_gnu_tree (gnat_entity, gnu_decl, false);
4551 /* If this is an enumeral or floating-point type, we were not able to set
4552 the bounds since they refer to the type. These bounds are always static.
4554 For enumeration types, also write debugging information and declare the
4555 enumeration literal table, if needed. */
4557 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4558 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4560 tree gnu_scalar_type = gnu_type;
4562 /* If this is a padded type, we need to use the underlying type. */
4563 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4564 && TYPE_IS_PADDING_P (gnu_scalar_type))
4565 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4567 /* If this is a floating point type and we haven't set a floating
4568 point type yet, use this in the evaluation of the bounds. */
4569 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4570 longest_float_type_node = gnu_type;
4572 TYPE_MIN_VALUE (gnu_scalar_type)
4573 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4574 TYPE_MAX_VALUE (gnu_scalar_type)
4575 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4577 if (TREE_CODE (gnu_scalar_type) == ENUMERAL_TYPE)
4579 /* Since this has both a typedef and a tag, avoid outputting
4581 DECL_ARTIFICIAL (gnu_decl) = 1;
4582 rest_of_type_decl_compilation (gnu_decl);
4586 /* If we deferred processing of incomplete types, re-enable it. If there
4587 were no other disables and we have some to process, do so. */
4588 if (this_deferred && --defer_incomplete_level == 0)
4590 if (defer_incomplete_list)
4592 struct incomplete *incp, *next;
4594 /* We are back to level 0 for the deferring of incomplete types.
4595 But processing these incomplete types below may itself require
4596 deferring, so preserve what we have and restart from scratch. */
4597 incp = defer_incomplete_list;
4598 defer_incomplete_list = NULL;
4600 /* For finalization, however, all types must be complete so we
4601 cannot do the same because deferred incomplete types may end up
4602 referencing each other. Process them all recursively first. */
4603 defer_finalize_level++;
4605 for (; incp; incp = next)
4610 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4611 gnat_to_gnu_type (incp->full_type));
4615 defer_finalize_level--;
4618 /* All the deferred incomplete types have been processed so we can
4619 now proceed with the finalization of the deferred types. */
4620 if (defer_finalize_level == 0 && defer_finalize_list)
4625 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4626 rest_of_type_decl_compilation_no_defer (t);
4628 VEC_free (tree, heap, defer_finalize_list);
4632 /* If we are not defining this type, see if it's in the incomplete list.
4633 If so, handle that list entry now. */
4634 else if (!definition)
4636 struct incomplete *incp;
4638 for (incp = defer_incomplete_list; incp; incp = incp->next)
4639 if (incp->old_type && incp->full_type == gnat_entity)
4641 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4642 TREE_TYPE (gnu_decl));
4643 incp->old_type = NULL_TREE;
4650 if (Is_Packed_Array_Type (gnat_entity)
4651 && Is_Itype (Associated_Node_For_Itype (gnat_entity))
4652 && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity)))
4653 && !present_gnu_tree (Associated_Node_For_Itype (gnat_entity)))
4654 gnat_to_gnu_entity (Associated_Node_For_Itype (gnat_entity), NULL_TREE, 0);
4659 /* Similar, but if the returned value is a COMPONENT_REF, return the
4663 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4665 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4667 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4668 gnu_field = TREE_OPERAND (gnu_field, 1);
4673 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4674 Every TYPE_DECL generated for a type definition must be passed
4675 to this function once everything else has been done for it. */
4678 rest_of_type_decl_compilation (tree decl)
4680 /* We need to defer finalizing the type if incomplete types
4681 are being deferred or if they are being processed. */
4682 if (defer_incomplete_level || defer_finalize_level)
4683 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4685 rest_of_type_decl_compilation_no_defer (decl);
4688 /* Same as above but without deferring the compilation. This
4689 function should not be invoked directly on a TYPE_DECL. */
4692 rest_of_type_decl_compilation_no_defer (tree decl)
4694 const int toplev = global_bindings_p ();
4695 tree t = TREE_TYPE (decl);
4697 rest_of_decl_compilation (decl, toplev, 0);
4699 /* Now process all the variants. This is needed for STABS. */
4700 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4702 if (t == TREE_TYPE (decl))
4705 if (!TYPE_STUB_DECL (t))
4707 TYPE_STUB_DECL (t) = build_decl (TYPE_DECL, DECL_NAME (decl), t);
4708 DECL_ARTIFICIAL (TYPE_STUB_DECL (t)) = 1;
4711 rest_of_type_compilation (t, toplev);
4715 /* Finalize any From_With_Type incomplete types. We do this after processing
4716 our compilation unit and after processing its spec, if this is a body. */
4719 finalize_from_with_types (void)
4721 struct incomplete *incp = defer_limited_with;
4722 struct incomplete *next;
4724 defer_limited_with = 0;
4725 for (; incp; incp = next)
4729 if (incp->old_type != 0)
4730 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4731 gnat_to_gnu_type (incp->full_type));
4736 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4737 kind of type (such E_Task_Type) that has a different type which Gigi
4738 uses for its representation. If the type does not have a special type
4739 for its representation, return GNAT_ENTITY. If a type is supposed to
4740 exist, but does not, abort unless annotating types, in which case
4741 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4744 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4746 Entity_Id gnat_equiv = gnat_entity;
4748 if (No (gnat_entity))
4751 switch (Ekind (gnat_entity))
4753 case E_Class_Wide_Subtype:
4754 if (Present (Equivalent_Type (gnat_entity)))
4755 gnat_equiv = Equivalent_Type (gnat_entity);
4758 case E_Access_Protected_Subprogram_Type:
4759 case E_Anonymous_Access_Protected_Subprogram_Type:
4760 gnat_equiv = Equivalent_Type (gnat_entity);
4763 case E_Class_Wide_Type:
4764 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
4765 ? Equivalent_Type (gnat_entity)
4766 : Root_Type (gnat_entity));
4770 case E_Task_Subtype:
4771 case E_Protected_Type:
4772 case E_Protected_Subtype:
4773 gnat_equiv = Corresponding_Record_Type (gnat_entity);
4780 gcc_assert (Present (gnat_equiv) || type_annotate_only);
4784 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
4785 using MECH as its passing mechanism, to be placed in the parameter
4786 list built for GNAT_SUBPROG. Assume a foreign convention for the
4787 latter if FOREIGN is true. Also set CICO to true if the parameter
4788 must use the copy-in copy-out implementation mechanism.
4790 The returned tree is a PARM_DECL, except for those cases where no
4791 parameter needs to be actually passed to the subprogram; the type
4792 of this "shadow" parameter is then returned instead. */
4795 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
4796 Entity_Id gnat_subprog, bool foreign, bool *cico)
4798 tree gnu_param_name = get_entity_name (gnat_param);
4799 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4800 tree gnu_param_type_alt = NULL_TREE;
4801 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
4802 /* The parameter can be indirectly modified if its address is taken. */
4803 bool ro_param = in_param && !Address_Taken (gnat_param);
4804 bool by_return = false, by_component_ptr = false, by_ref = false;
4807 /* Copy-return is used only for the first parameter of a valued procedure.
4808 It's a copy mechanism for which a parameter is never allocated. */
4809 if (mech == By_Copy_Return)
4811 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
4816 /* If this is either a foreign function or if the underlying type won't
4817 be passed by reference, strip off possible padding type. */
4818 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
4819 && TYPE_IS_PADDING_P (gnu_param_type))
4821 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
4823 if (mech == By_Reference
4825 || (!must_pass_by_ref (unpadded_type)
4826 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
4827 gnu_param_type = unpadded_type;
4830 /* If this is a read-only parameter, make a variant of the type that is
4831 read-only. ??? However, if this is an unconstrained array, that type
4832 can be very complex, so skip it for now. Likewise for any other
4833 self-referential type. */
4835 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
4836 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
4837 gnu_param_type = build_qualified_type (gnu_param_type,
4838 (TYPE_QUALS (gnu_param_type)
4839 | TYPE_QUAL_CONST));
4841 /* For foreign conventions, pass arrays as pointers to the element type.
4842 First check for unconstrained array and get the underlying array. */
4843 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
4845 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
4847 /* VMS descriptors are themselves passed by reference. */
4848 if (mech == By_Short_Descriptor ||
4849 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
4851 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
4852 Mechanism (gnat_param),
4854 else if (mech == By_Descriptor)
4856 /* Build both a 32-bit and 64-bit descriptor, one of which will be
4857 chosen in fill_vms_descriptor. */
4859 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
4860 Mechanism (gnat_param),
4863 = build_pointer_type (build_vms_descriptor (gnu_param_type,
4864 Mechanism (gnat_param),
4868 /* Arrays are passed as pointers to element type for foreign conventions. */
4871 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
4873 /* Strip off any multi-dimensional entries, then strip
4874 off the last array to get the component type. */
4875 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
4876 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
4877 gnu_param_type = TREE_TYPE (gnu_param_type);
4879 by_component_ptr = true;
4880 gnu_param_type = TREE_TYPE (gnu_param_type);
4883 gnu_param_type = build_qualified_type (gnu_param_type,
4884 (TYPE_QUALS (gnu_param_type)
4885 | TYPE_QUAL_CONST));
4887 gnu_param_type = build_pointer_type (gnu_param_type);
4890 /* Fat pointers are passed as thin pointers for foreign conventions. */
4891 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
4893 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
4895 /* If we must pass or were requested to pass by reference, do so.
4896 If we were requested to pass by copy, do so.
4897 Otherwise, for foreign conventions, pass In Out or Out parameters
4898 or aggregates by reference. For COBOL and Fortran, pass all
4899 integer and FP types that way too. For Convention Ada, use
4900 the standard Ada default. */
4901 else if (must_pass_by_ref (gnu_param_type)
4902 || mech == By_Reference
4905 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
4907 && (Convention (gnat_subprog) == Convention_Fortran
4908 || Convention (gnat_subprog) == Convention_COBOL)
4909 && (INTEGRAL_TYPE_P (gnu_param_type)
4910 || FLOAT_TYPE_P (gnu_param_type)))
4912 && default_pass_by_ref (gnu_param_type)))))
4914 gnu_param_type = build_reference_type (gnu_param_type);
4918 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
4922 if (mech == By_Copy && (by_ref || by_component_ptr))
4923 post_error ("?cannot pass & by copy", gnat_param);
4925 /* If this is an Out parameter that isn't passed by reference and isn't
4926 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
4927 it will be a VAR_DECL created when we process the procedure, so just
4928 return its type. For the special parameter of a valued procedure,
4931 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
4932 Out parameters with discriminants or implicit initial values to be
4933 handled like In Out parameters. These type are normally built as
4934 aggregates, hence passed by reference, except for some packed arrays
4935 which end up encoded in special integer types.
4937 The exception we need to make is then for packed arrays of records
4938 with discriminants or implicit initial values. We have no light/easy
4939 way to check for the latter case, so we merely check for packed arrays
4940 of records. This may lead to useless copy-in operations, but in very
4941 rare cases only, as these would be exceptions in a set of already
4942 exceptional situations. */
4943 if (Ekind (gnat_param) == E_Out_Parameter
4946 || (mech != By_Descriptor
4947 && mech != By_Short_Descriptor
4948 && !POINTER_TYPE_P (gnu_param_type)
4949 && !AGGREGATE_TYPE_P (gnu_param_type)))
4950 && !(Is_Array_Type (Etype (gnat_param))
4951 && Is_Packed (Etype (gnat_param))
4952 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
4953 return gnu_param_type;
4955 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
4956 ro_param || by_ref || by_component_ptr);
4957 DECL_BY_REF_P (gnu_param) = by_ref;
4958 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
4959 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
4960 mech == By_Short_Descriptor);
4961 DECL_POINTS_TO_READONLY_P (gnu_param)
4962 = (ro_param && (by_ref || by_component_ptr));
4964 /* Save the alternate descriptor type, if any. */
4965 if (gnu_param_type_alt)
4966 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
4968 /* If no Mechanism was specified, indicate what we're using, then
4969 back-annotate it. */
4970 if (mech == Default)
4971 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
4973 Set_Mechanism (gnat_param, mech);
4977 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
4980 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
4982 while (Present (Corresponding_Discriminant (discr1)))
4983 discr1 = Corresponding_Discriminant (discr1);
4985 while (Present (Corresponding_Discriminant (discr2)))
4986 discr2 = Corresponding_Discriminant (discr2);
4989 Original_Record_Component (discr1) == Original_Record_Component (discr2);
4992 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
4993 a non-aliased component in the back-end sense. */
4996 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
4998 /* If the type below this is a multi-array type, then
4999 this does not have aliased components. */
5000 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5001 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5004 if (Has_Aliased_Components (gnat_type))
5007 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5010 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5011 be elaborated at the point of its definition, but do nothing else. */
5014 elaborate_entity (Entity_Id gnat_entity)
5016 switch (Ekind (gnat_entity))
5018 case E_Signed_Integer_Subtype:
5019 case E_Modular_Integer_Subtype:
5020 case E_Enumeration_Subtype:
5021 case E_Ordinary_Fixed_Point_Subtype:
5022 case E_Decimal_Fixed_Point_Subtype:
5023 case E_Floating_Point_Subtype:
5025 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5026 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5028 /* ??? Tests for avoiding static constraint error expression
5029 is needed until the front stops generating bogus conversions
5030 on bounds of real types. */
5032 if (!Raises_Constraint_Error (gnat_lb))
5033 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5034 1, 0, Needs_Debug_Info (gnat_entity));
5035 if (!Raises_Constraint_Error (gnat_hb))
5036 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5037 1, 0, Needs_Debug_Info (gnat_entity));
5043 Node_Id full_definition = Declaration_Node (gnat_entity);
5044 Node_Id record_definition = Type_Definition (full_definition);
5046 /* If this is a record extension, go a level further to find the
5047 record definition. */
5048 if (Nkind (record_definition) == N_Derived_Type_Definition)
5049 record_definition = Record_Extension_Part (record_definition);
5053 case E_Record_Subtype:
5054 case E_Private_Subtype:
5055 case E_Limited_Private_Subtype:
5056 case E_Record_Subtype_With_Private:
5057 if (Is_Constrained (gnat_entity)
5058 && Has_Discriminants (Base_Type (gnat_entity))
5059 && Present (Discriminant_Constraint (gnat_entity)))
5061 Node_Id gnat_discriminant_expr;
5062 Entity_Id gnat_field;
5064 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
5065 gnat_discriminant_expr
5066 = First_Elmt (Discriminant_Constraint (gnat_entity));
5067 Present (gnat_field);
5068 gnat_field = Next_Discriminant (gnat_field),
5069 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5070 /* ??? For now, ignore access discriminants. */
5071 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5072 elaborate_expression (Node (gnat_discriminant_expr),
5074 get_entity_name (gnat_field), 1, 0, 0);
5081 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5082 any entities on its entity chain similarly. */
5085 mark_out_of_scope (Entity_Id gnat_entity)
5087 Entity_Id gnat_sub_entity;
5088 unsigned int kind = Ekind (gnat_entity);
5090 /* If this has an entity list, process all in the list. */
5091 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5092 || IN (kind, Private_Kind)
5093 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5094 || kind == E_Function || kind == E_Generic_Function
5095 || kind == E_Generic_Package || kind == E_Generic_Procedure
5096 || kind == E_Loop || kind == E_Operator || kind == E_Package
5097 || kind == E_Package_Body || kind == E_Procedure
5098 || kind == E_Record_Type || kind == E_Record_Subtype
5099 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5100 for (gnat_sub_entity = First_Entity (gnat_entity);
5101 Present (gnat_sub_entity);
5102 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5103 if (Scope (gnat_sub_entity) == gnat_entity
5104 && gnat_sub_entity != gnat_entity)
5105 mark_out_of_scope (gnat_sub_entity);
5107 /* Now clear this if it has been defined, but only do so if it isn't
5108 a subprogram or parameter. We could refine this, but it isn't
5109 worth it. If this is statically allocated, it is supposed to
5110 hang around out of cope. */
5111 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5112 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5114 save_gnu_tree (gnat_entity, NULL_TREE, true);
5115 save_gnu_tree (gnat_entity, error_mark_node, true);
5119 /* Set the alias set of GNU_NEW_TYPE to be that of GNU_OLD_TYPE. If this
5120 is a multi-dimensional array type, do this recursively. */
5123 copy_alias_set (tree gnu_new_type, tree gnu_old_type)
5125 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5126 of a one-dimensional array, since the padding has the same alias set
5127 as the field type, but if it's a multi-dimensional array, we need to
5128 see the inner types. */
5129 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5130 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5131 || TYPE_IS_PADDING_P (gnu_old_type)))
5132 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5134 /* We need to be careful here in case GNU_OLD_TYPE is an unconstrained
5135 array. In that case, it doesn't have the same shape as GNU_NEW_TYPE,
5136 so we need to go down to what does. */
5137 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5139 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5141 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5142 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5143 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5144 copy_alias_set (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type));
5146 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5147 record_component_aliases (gnu_new_type);
5150 /* Return a TREE_LIST describing the substitutions needed to reflect
5151 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
5152 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
5153 of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE
5154 gives the tree for the discriminant and TREE_VALUES is the replacement
5155 value. They are in the form of operands to substitute_in_expr.
5156 DEFINITION is as in gnat_to_gnu_entity. */
5159 substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type,
5160 tree gnu_list, bool definition)
5162 Entity_Id gnat_discrim;
5166 gnat_type = Implementation_Base_Type (gnat_subtype);
5168 if (Has_Discriminants (gnat_type))
5169 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5170 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5171 Present (gnat_discrim);
5172 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5173 gnat_value = Next_Elmt (gnat_value))
5174 /* Ignore access discriminants. */
5175 if (!Is_Access_Type (Etype (Node (gnat_value))))
5176 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5177 elaborate_expression
5178 (Node (gnat_value), gnat_subtype,
5179 get_entity_name (gnat_discrim), definition,
5186 /* Return true if the size represented by GNU_SIZE can be handled by an
5187 allocation. If STATIC_P is true, consider only what can be done with a
5188 static allocation. */
5191 allocatable_size_p (tree gnu_size, bool static_p)
5193 HOST_WIDE_INT our_size;
5195 /* If this is not a static allocation, the only case we want to forbid
5196 is an overflowing size. That will be converted into a raise a
5199 return !(TREE_CODE (gnu_size) == INTEGER_CST
5200 && TREE_OVERFLOW (gnu_size));
5202 /* Otherwise, we need to deal with both variable sizes and constant
5203 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5204 since assemblers may not like very large sizes. */
5205 if (!host_integerp (gnu_size, 1))
5208 our_size = tree_low_cst (gnu_size, 1);
5209 return (int) our_size == our_size;
5212 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5213 NAME, ARGS and ERROR_POINT. */
5216 prepend_one_attribute_to (struct attrib ** attr_list,
5217 enum attr_type attr_type,
5220 Node_Id attr_error_point)
5222 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5224 attr->type = attr_type;
5225 attr->name = attr_name;
5226 attr->args = attr_args;
5227 attr->error_point = attr_error_point;
5229 attr->next = *attr_list;
5233 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5236 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5240 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5241 gnat_temp = Next_Rep_Item (gnat_temp))
5242 if (Nkind (gnat_temp) == N_Pragma)
5244 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5245 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5246 enum attr_type etype;
5248 if (Present (gnat_assoc) && Present (First (gnat_assoc))
5249 && Present (Next (First (gnat_assoc)))
5250 && (Nkind (Expression (Next (First (gnat_assoc))))
5251 == N_String_Literal))
5253 gnu_arg0 = get_identifier (TREE_STRING_POINTER
5256 (First (gnat_assoc))))));
5257 if (Present (Next (Next (First (gnat_assoc))))
5258 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
5259 == N_String_Literal))
5260 gnu_arg1 = get_identifier (TREE_STRING_POINTER
5264 (First (gnat_assoc)))))));
5267 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5269 case Pragma_Machine_Attribute:
5270 etype = ATTR_MACHINE_ATTRIBUTE;
5273 case Pragma_Linker_Alias:
5274 etype = ATTR_LINK_ALIAS;
5277 case Pragma_Linker_Section:
5278 etype = ATTR_LINK_SECTION;
5281 case Pragma_Linker_Constructor:
5282 etype = ATTR_LINK_CONSTRUCTOR;
5285 case Pragma_Linker_Destructor:
5286 etype = ATTR_LINK_DESTRUCTOR;
5289 case Pragma_Weak_External:
5290 etype = ATTR_WEAK_EXTERNAL;
5298 /* Prepend to the list now. Make a list of the argument we might
5299 have, as GCC expects it. */
5300 prepend_one_attribute_to
5303 (gnu_arg1 != NULL_TREE)
5304 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5305 Present (Next (First (gnat_assoc)))
5306 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5310 /* Get the unpadded version of a GNAT type. */
5313 get_unpadded_type (Entity_Id gnat_entity)
5315 tree type = gnat_to_gnu_type (gnat_entity);
5317 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5318 type = TREE_TYPE (TYPE_FIELDS (type));
5323 /* Called when we need to protect a variable object using a save_expr. */
5326 maybe_variable (tree gnu_operand)
5328 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
5329 || TREE_CODE (gnu_operand) == SAVE_EXPR
5330 || TREE_CODE (gnu_operand) == NULL_EXPR)
5333 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5335 tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF,
5336 TREE_TYPE (gnu_operand),
5337 variable_size (TREE_OPERAND (gnu_operand, 0)));
5339 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5340 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5344 return variable_size (gnu_operand);
5347 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5348 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5349 return the GCC tree to use for that expression. GNU_NAME is the
5350 qualification to use if an external name is appropriate and DEFINITION is
5351 nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero,
5352 we need a result. Otherwise, we are just elaborating this for
5353 side-effects. If NEED_DEBUG is nonzero we need the symbol for debugging
5354 purposes even if it isn't needed for code generation. */
5357 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity,
5358 tree gnu_name, bool definition, bool need_value,
5363 /* If we already elaborated this expression (e.g., it was involved
5364 in the definition of a private type), use the old value. */
5365 if (present_gnu_tree (gnat_expr))
5366 return get_gnu_tree (gnat_expr);
5368 /* If we don't need a value and this is static or a discriminant, we
5369 don't need to do anything. */
5370 else if (!need_value
5371 && (Is_OK_Static_Expression (gnat_expr)
5372 || (Nkind (gnat_expr) == N_Identifier
5373 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5376 /* Otherwise, convert this tree to its GCC equivalent. */
5378 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
5379 gnu_name, definition, need_debug);
5381 /* Save the expression in case we try to elaborate this entity again. Since
5382 this is not a DECL, don't check it. Don't save if it's a discriminant. */
5383 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5384 save_gnu_tree (gnat_expr, gnu_expr, true);
5386 return need_value ? gnu_expr : error_mark_node;
5389 /* Similar, but take a GNU expression. */
5392 elaborate_expression_1 (Node_Id gnat_expr, Entity_Id gnat_entity,
5393 tree gnu_expr, tree gnu_name, bool definition,
5396 tree gnu_decl = NULL_TREE;
5397 /* Skip any conversions and simple arithmetics to see if the expression
5398 is a read-only variable.
5399 ??? This really should remain read-only, but we have to think about
5400 the typing of the tree here. */
5402 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5403 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5406 /* In most cases, we won't see a naked FIELD_DECL here because a
5407 discriminant reference will have been replaced with a COMPONENT_REF
5408 when the type is being elaborated. However, there are some cases
5409 involving child types where we will. So convert it to a COMPONENT_REF
5410 here. We have to hope it will be at the highest level of the
5411 expression in these cases. */
5412 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5413 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5414 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5415 gnu_expr, NULL_TREE);
5417 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5418 that is read-only, make a variable that is initialized to contain the
5419 bound when the package containing the definition is elaborated. If
5420 this entity is defined at top level and a bound or discriminant value
5421 isn't a constant or a reference to a discriminant, replace the bound
5422 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5423 rely here on the fact that an expression cannot contain both the
5424 discriminant and some other variable. */
5426 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5427 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5428 && (TREE_READONLY (gnu_inner_expr)
5429 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5430 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5432 /* If this is a static expression or contains a discriminant, we don't
5433 need the variable for debugging (and can't elaborate anyway if a
5436 && (Is_OK_Static_Expression (gnat_expr)
5437 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
5440 /* Now create the variable if we need it. */
5441 if (need_debug || (expr_variable && expr_global))
5443 = create_var_decl (create_concat_name (gnat_entity,
5444 IDENTIFIER_POINTER (gnu_name)),
5445 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5446 !need_debug, Is_Public (gnat_entity),
5447 !definition, false, NULL, gnat_entity);
5449 /* We only need to use this variable if we are in global context since GCC
5450 can do the right thing in the local case. */
5451 if (expr_global && expr_variable)
5453 else if (!expr_variable)
5456 return maybe_variable (gnu_expr);
5459 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5460 starting bit position so that it is aligned to ALIGN bits, and leaving at
5461 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5462 record is guaranteed to get. */
5465 make_aligning_type (tree type, unsigned int align, tree size,
5466 unsigned int base_align, int room)
5468 /* We will be crafting a record type with one field at a position set to be
5469 the next multiple of ALIGN past record'address + room bytes. We use a
5470 record placeholder to express record'address. */
5472 tree record_type = make_node (RECORD_TYPE);
5473 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5476 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5478 /* The diagram below summarizes the shape of what we manipulate:
5480 <--------- pos ---------->
5481 { +------------+-------------+-----------------+
5482 record =>{ |############| ... | field (type) |
5483 { +------------+-------------+-----------------+
5484 |<-- room -->|<- voffset ->|<---- size ----->|
5487 record_addr vblock_addr
5489 Every length is in sizetype bytes there, except "pos" which has to be
5490 set as a bit position in the GCC tree for the record. */
5492 tree room_st = size_int (room);
5493 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5494 tree voffset_st, pos, field;
5496 tree name = TYPE_NAME (type);
5498 if (TREE_CODE (name) == TYPE_DECL)
5499 name = DECL_NAME (name);
5501 TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN");
5503 /* Compute VOFFSET and then POS. The next byte position multiple of some
5504 alignment after some address is obtained by "and"ing the alignment minus
5505 1 with the two's complement of the address. */
5507 voffset_st = size_binop (BIT_AND_EXPR,
5508 size_diffop (size_zero_node, vblock_addr_st),
5509 ssize_int ((align / BITS_PER_UNIT) - 1));
5511 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5513 pos = size_binop (MULT_EXPR,
5514 convert (bitsizetype,
5515 size_binop (PLUS_EXPR, room_st, voffset_st)),
5518 /* Craft the GCC record representation. We exceptionally do everything
5519 manually here because 1) our generic circuitry is not quite ready to
5520 handle the complex position/size expressions we are setting up, 2) we
5521 have a strong simplifying factor at hand: we know the maximum possible
5522 value of voffset, and 3) we have to set/reset at least the sizes in
5523 accordance with this maximum value anyway, as we need them to convey
5524 what should be "alloc"ated for this type.
5526 Use -1 as the 'addressable' indication for the field to prevent the
5527 creation of a bitfield. We don't need one, it would have damaging
5528 consequences on the alignment computation, and create_field_decl would
5529 make one without this special argument, for instance because of the
5530 complex position expression. */
5532 field = create_field_decl (get_identifier ("F"), type, record_type,
5534 TYPE_FIELDS (record_type) = field;
5536 TYPE_ALIGN (record_type) = base_align;
5537 TYPE_USER_ALIGN (record_type) = 1;
5539 TYPE_SIZE (record_type)
5540 = size_binop (PLUS_EXPR,
5541 size_binop (MULT_EXPR, convert (bitsizetype, size),
5543 bitsize_int (align + room * BITS_PER_UNIT));
5544 TYPE_SIZE_UNIT (record_type)
5545 = size_binop (PLUS_EXPR, size,
5546 size_int (room + align / BITS_PER_UNIT));
5548 TYPE_MODE (record_type) = BLKmode;
5550 copy_alias_set (record_type, type);
5554 /* Return the result of rounding T up to ALIGN. */
5556 static inline unsigned HOST_WIDE_INT
5557 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5565 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5566 as the field type of a packed record if IN_RECORD is true, or as the
5567 component type of a packed array if IN_RECORD is false. See if we can
5568 rewrite it either as a type that has a non-BLKmode, which we can pack
5569 tighter in the packed record case, or as a smaller type with BLKmode.
5570 If so, return the new type. If not, return the original type. */
5573 make_packable_type (tree type, bool in_record)
5575 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5576 unsigned HOST_WIDE_INT new_size;
5577 tree new_type, old_field, field_list = NULL_TREE;
5579 /* No point in doing anything if the size is zero. */
5583 new_type = make_node (TREE_CODE (type));
5585 /* Copy the name and flags from the old type to that of the new.
5586 Note that we rely on the pointer equality created here for
5587 TYPE_NAME to look through conversions in various places. */
5588 TYPE_NAME (new_type) = TYPE_NAME (type);
5589 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5590 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5591 if (TREE_CODE (type) == RECORD_TYPE)
5592 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5594 /* If we are in a record and have a small size, set the alignment to
5595 try for an integral mode. Otherwise set it to try for a smaller
5596 type with BLKmode. */
5597 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5599 TYPE_ALIGN (new_type) = ceil_alignment (size);
5600 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5604 unsigned HOST_WIDE_INT align;
5606 /* Do not try to shrink the size if the RM size is not constant. */
5607 if (TYPE_CONTAINS_TEMPLATE_P (type)
5608 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5611 /* Round the RM size up to a unit boundary to get the minimal size
5612 for a BLKmode record. Give up if it's already the size. */
5613 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5614 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5615 if (new_size == size)
5618 align = new_size & -new_size;
5619 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5622 TYPE_USER_ALIGN (new_type) = 1;
5624 /* Now copy the fields, keeping the position and size as we don't want
5625 to change the layout by propagating the packedness downwards. */
5626 for (old_field = TYPE_FIELDS (type); old_field;
5627 old_field = TREE_CHAIN (old_field))
5629 tree new_field_type = TREE_TYPE (old_field);
5630 tree new_field, new_size;
5632 if (TYPE_MODE (new_field_type) == BLKmode
5633 && (TREE_CODE (new_field_type) == RECORD_TYPE
5634 || TREE_CODE (new_field_type) == UNION_TYPE
5635 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5636 && host_integerp (TYPE_SIZE (new_field_type), 1))
5637 new_field_type = make_packable_type (new_field_type, true);
5639 /* However, for the last field in a not already packed record type
5640 that is of an aggregate type, we need to use the RM_Size in the
5641 packable version of the record type, see finish_record_type. */
5642 if (!TREE_CHAIN (old_field)
5643 && !TYPE_PACKED (type)
5644 && (TREE_CODE (new_field_type) == RECORD_TYPE
5645 || TREE_CODE (new_field_type) == UNION_TYPE
5646 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5647 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5648 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5649 && TYPE_ADA_SIZE (new_field_type))
5650 new_size = TYPE_ADA_SIZE (new_field_type);
5652 new_size = DECL_SIZE (old_field);
5654 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5655 new_type, TYPE_PACKED (type), new_size,
5656 bit_position (old_field),
5657 !DECL_NONADDRESSABLE_P (old_field));
5659 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
5660 SET_DECL_ORIGINAL_FIELD
5661 (new_field, (DECL_ORIGINAL_FIELD (old_field)
5662 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
5664 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
5665 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
5667 TREE_CHAIN (new_field) = field_list;
5668 field_list = new_field;
5671 finish_record_type (new_type, nreverse (field_list), 2, true);
5672 copy_alias_set (new_type, type);
5674 /* If this is a padding record, we never want to make the size smaller
5675 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
5676 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5677 || TREE_CODE (type) == QUAL_UNION_TYPE)
5679 TYPE_SIZE (new_type) = TYPE_SIZE (type);
5680 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
5684 TYPE_SIZE (new_type) = bitsize_int (new_size);
5685 TYPE_SIZE_UNIT (new_type)
5686 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
5689 if (!TYPE_CONTAINS_TEMPLATE_P (type))
5690 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
5692 compute_record_mode (new_type);
5694 /* Try harder to get a packable type if necessary, for example
5695 in case the record itself contains a BLKmode field. */
5696 if (in_record && TYPE_MODE (new_type) == BLKmode)
5697 TYPE_MODE (new_type)
5698 = mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1);
5700 /* If neither the mode nor the size has shrunk, return the old type. */
5701 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
5707 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
5708 if needed. We have already verified that SIZE and TYPE are large enough.
5710 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
5713 IS_USER_TYPE is true if we must complete the original type.
5715 DEFINITION is true if this type is being defined.
5717 SAME_RM_SIZE is true if the RM_Size of the resulting type is to be set
5718 to SIZE too; otherwise, it's set to the RM_Size of the original type. */
5721 maybe_pad_type (tree type, tree size, unsigned int align,
5722 Entity_Id gnat_entity, const char *name_trailer,
5723 bool is_user_type, bool definition, bool same_rm_size)
5725 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
5726 tree orig_size = TYPE_SIZE (type);
5727 unsigned int orig_align = align;
5730 /* If TYPE is a padded type, see if it agrees with any size and alignment
5731 we were given. If so, return the original type. Otherwise, strip
5732 off the padding, since we will either be returning the inner type
5733 or repadding it. If no size or alignment is specified, use that of
5734 the original padded type. */
5735 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5738 || operand_equal_p (round_up (size,
5739 MAX (align, TYPE_ALIGN (type))),
5740 round_up (TYPE_SIZE (type),
5741 MAX (align, TYPE_ALIGN (type))),
5743 && (align == 0 || align == TYPE_ALIGN (type)))
5747 size = TYPE_SIZE (type);
5749 align = TYPE_ALIGN (type);
5751 type = TREE_TYPE (TYPE_FIELDS (type));
5752 orig_size = TYPE_SIZE (type);
5755 /* If the size is either not being changed or is being made smaller (which
5756 is not done here (and is only valid for bitfields anyway), show the size
5757 isn't changing. Likewise, clear the alignment if it isn't being
5758 changed. Then return if we aren't doing anything. */
5760 && (operand_equal_p (size, orig_size, 0)
5761 || (TREE_CODE (orig_size) == INTEGER_CST
5762 && tree_int_cst_lt (size, orig_size))))
5765 if (align == TYPE_ALIGN (type))
5768 if (align == 0 && !size)
5771 /* If requested, complete the original type and give it a name. */
5773 create_type_decl (get_entity_name (gnat_entity), type,
5774 NULL, !Comes_From_Source (gnat_entity),
5776 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
5777 && DECL_IGNORED_P (TYPE_NAME (type))),
5780 /* We used to modify the record in place in some cases, but that could
5781 generate incorrect debugging information. So make a new record
5783 record = make_node (RECORD_TYPE);
5784 TYPE_IS_PADDING_P (record) = 1;
5786 if (Present (gnat_entity))
5787 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
5789 TYPE_VOLATILE (record)
5790 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
5792 TYPE_ALIGN (record) = align;
5794 TYPE_USER_ALIGN (record) = align;
5796 TYPE_SIZE (record) = size ? size : orig_size;
5797 TYPE_SIZE_UNIT (record)
5798 = convert (sizetype,
5799 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
5800 bitsize_unit_node));
5802 /* If we are changing the alignment and the input type is a record with
5803 BLKmode and a small constant size, try to make a form that has an
5804 integral mode. This might allow the padding record to also have an
5805 integral mode, which will be much more efficient. There is no point
5806 in doing so if a size is specified unless it is also a small constant
5807 size and it is incorrect to do so if we cannot guarantee that the mode
5808 will be naturally aligned since the field must always be addressable.
5810 ??? This might not always be a win when done for a stand-alone object:
5811 since the nominal and the effective type of the object will now have
5812 different modes, a VIEW_CONVERT_EXPR will be required for converting
5813 between them and it might be hard to overcome afterwards, including
5814 at the RTL level when the stand-alone object is accessed as a whole. */
5816 && TREE_CODE (type) == RECORD_TYPE
5817 && TYPE_MODE (type) == BLKmode
5818 && TREE_CODE (orig_size) == INTEGER_CST
5819 && !TREE_CONSTANT_OVERFLOW (orig_size)
5820 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
5822 || (TREE_CODE (size) == INTEGER_CST
5823 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
5825 tree packable_type = make_packable_type (type, true);
5826 if (TYPE_MODE (packable_type) != BLKmode
5827 && align >= TYPE_ALIGN (packable_type))
5828 type = packable_type;
5831 /* Now create the field with the original size. */
5832 field = create_field_decl (get_identifier ("F"), type, record, 0,
5833 orig_size, bitsize_zero_node, 1);
5834 DECL_INTERNAL_P (field) = 1;
5836 /* Do not finalize it until after the auxiliary record is built. */
5837 finish_record_type (record, field, 1, true);
5839 /* Set the same size for its RM_size if requested; otherwise reuse
5840 the RM_size of the original type. */
5841 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
5843 /* Unless debugging information isn't being written for the input type,
5844 write a record that shows what we are a subtype of and also make a
5845 variable that indicates our size, if still variable. */
5846 if (TYPE_NAME (record)
5847 && AGGREGATE_TYPE_P (type)
5848 && TREE_CODE (orig_size) != INTEGER_CST
5849 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
5850 && DECL_IGNORED_P (TYPE_NAME (type))))
5852 tree marker = make_node (RECORD_TYPE);
5853 tree name = TYPE_NAME (record);
5854 tree orig_name = TYPE_NAME (type);
5856 if (TREE_CODE (name) == TYPE_DECL)
5857 name = DECL_NAME (name);
5859 if (TREE_CODE (orig_name) == TYPE_DECL)
5860 orig_name = DECL_NAME (orig_name);
5862 TYPE_NAME (marker) = concat_id_with_name (name, "XVS");
5863 finish_record_type (marker,
5864 create_field_decl (orig_name, integer_type_node,
5865 marker, 0, NULL_TREE, NULL_TREE,
5869 add_parallel_type (TYPE_STUB_DECL (record), marker);
5871 if (size && TREE_CODE (size) != INTEGER_CST && definition)
5872 create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE,
5873 sizetype, TYPE_SIZE_UNIT (record), false, false,
5874 false, false, NULL, gnat_entity);
5877 rest_of_record_type_compilation (record);
5879 /* If the size was widened explicitly, maybe give a warning. Take the
5880 original size as the maximum size of the input if there was an
5881 unconstrained record involved and round it up to the specified alignment,
5882 if one was specified. */
5883 if (CONTAINS_PLACEHOLDER_P (orig_size))
5884 orig_size = max_size (orig_size, true);
5887 orig_size = round_up (orig_size, align);
5889 if (size && Present (gnat_entity)
5890 && !operand_equal_p (size, orig_size, 0)
5891 && !(TREE_CODE (size) == INTEGER_CST
5892 && TREE_CODE (orig_size) == INTEGER_CST
5893 && tree_int_cst_lt (size, orig_size)))
5895 Node_Id gnat_error_node = Empty;
5897 if (Is_Packed_Array_Type (gnat_entity))
5898 gnat_entity = Original_Array_Type (gnat_entity);
5900 if ((Ekind (gnat_entity) == E_Component
5901 || Ekind (gnat_entity) == E_Discriminant)
5902 && Present (Component_Clause (gnat_entity)))
5903 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
5904 else if (Present (Size_Clause (gnat_entity)))
5905 gnat_error_node = Expression (Size_Clause (gnat_entity));
5907 /* Generate message only for entities that come from source, since
5908 if we have an entity created by expansion, the message will be
5909 generated for some other corresponding source entity. */
5910 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
5911 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
5913 size_diffop (size, orig_size));
5915 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
5916 post_error_ne_tree ("component of& padded{ by ^ bits}?",
5917 gnat_entity, gnat_entity,
5918 size_diffop (size, orig_size));
5924 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
5925 the value passed against the list of choices. */
5928 choices_to_gnu (tree operand, Node_Id choices)
5932 tree result = integer_zero_node;
5933 tree this_test, low = 0, high = 0, single = 0;
5935 for (choice = First (choices); Present (choice); choice = Next (choice))
5937 switch (Nkind (choice))
5940 low = gnat_to_gnu (Low_Bound (choice));
5941 high = gnat_to_gnu (High_Bound (choice));
5943 /* There's no good type to use here, so we might as well use
5944 integer_type_node. */
5946 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
5947 build_binary_op (GE_EXPR, integer_type_node,
5949 build_binary_op (LE_EXPR, integer_type_node,
5954 case N_Subtype_Indication:
5955 gnat_temp = Range_Expression (Constraint (choice));
5956 low = gnat_to_gnu (Low_Bound (gnat_temp));
5957 high = gnat_to_gnu (High_Bound (gnat_temp));
5960 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
5961 build_binary_op (GE_EXPR, integer_type_node,
5963 build_binary_op (LE_EXPR, integer_type_node,
5968 case N_Expanded_Name:
5969 /* This represents either a subtype range, an enumeration
5970 literal, or a constant Ekind says which. If an enumeration
5971 literal or constant, fall through to the next case. */
5972 if (Ekind (Entity (choice)) != E_Enumeration_Literal
5973 && Ekind (Entity (choice)) != E_Constant)
5975 tree type = gnat_to_gnu_type (Entity (choice));
5977 low = TYPE_MIN_VALUE (type);
5978 high = TYPE_MAX_VALUE (type);
5981 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
5982 build_binary_op (GE_EXPR, integer_type_node,
5984 build_binary_op (LE_EXPR, integer_type_node,
5988 /* ... fall through ... */
5989 case N_Character_Literal:
5990 case N_Integer_Literal:
5991 single = gnat_to_gnu (choice);
5992 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
5996 case N_Others_Choice:
5997 this_test = integer_one_node;
6004 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6011 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6012 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6015 adjust_packed (tree field_type, tree record_type, int packed)
6017 /* If the field contains an item of variable size, we cannot pack it
6018 because we cannot create temporaries of non-fixed size in case
6019 we need to take the address of the field. See addressable_p and
6020 the notes on the addressability issues for further details. */
6021 if (is_variable_size (field_type))
6024 /* If the alignment of the record is specified and the field type
6025 is over-aligned, request Storage_Unit alignment for the field. */
6028 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6037 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6038 placed in GNU_RECORD_TYPE.
6040 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6041 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6042 record has a specified alignment.
6044 DEFINITION is true if this field is for a record being defined. */
6047 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6050 tree gnu_field_id = get_entity_name (gnat_field);
6051 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6052 tree gnu_field, gnu_size, gnu_pos;
6053 bool needs_strict_alignment
6054 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6055 || Treat_As_Volatile (gnat_field));
6057 /* If this field requires strict alignment, we cannot pack it because
6058 it would very likely be under-aligned in the record. */
6059 if (needs_strict_alignment)
6062 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6064 /* If a size is specified, use it. Otherwise, if the record type is packed,
6065 use the official RM size. See "Handling of Type'Size Values" in Einfo
6066 for further details. */
6067 if (Known_Static_Esize (gnat_field))
6068 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6069 gnat_field, FIELD_DECL, false, true);
6070 else if (packed == 1)
6071 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6072 gnat_field, FIELD_DECL, false, true);
6074 gnu_size = NULL_TREE;
6076 /* If we have a specified size that's smaller than that of the field type,
6077 or a position is specified, and the field type is also a record that's
6078 BLKmode, see if we can get either an integral mode form of the type or
6079 a smaller BLKmode form. If we can, show a size was specified for the
6080 field if there wasn't one already, so we know to make this a bitfield
6081 and avoid making things wider.
6083 Doing this is first useful if the record is packed because we may then
6084 place the field at a non-byte-aligned position and so achieve tighter
6087 This is in addition *required* if the field shares a byte with another
6088 field and the front-end lets the back-end handle the references, because
6089 GCC does not handle BLKmode bitfields properly.
6091 We avoid the transformation if it is not required or potentially useful,
6092 as it might entail an increase of the field's alignment and have ripple
6093 effects on the outer record type. A typical case is a field known to be
6094 byte aligned and not to share a byte with another field.
6096 Besides, we don't even look the possibility of a transformation in cases
6097 known to be in error already, for instance when an invalid size results
6098 from a component clause. */
6100 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6101 && TYPE_MODE (gnu_field_type) == BLKmode
6102 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6105 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6106 || Present (Component_Clause (gnat_field))))))
6108 /* See what the alternate type and size would be. */
6109 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6111 bool has_byte_aligned_clause
6112 = Present (Component_Clause (gnat_field))
6113 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6114 % BITS_PER_UNIT == 0);
6116 /* Compute whether we should avoid the substitution. */
6118 /* There is no point substituting if there is no change... */
6119 = (gnu_packable_type == gnu_field_type)
6120 /* ... nor when the field is known to be byte aligned and not to
6121 share a byte with another field. */
6122 || (has_byte_aligned_clause
6123 && value_factor_p (gnu_size, BITS_PER_UNIT))
6124 /* The size of an aliased field must be an exact multiple of the
6125 type's alignment, which the substitution might increase. Reject
6126 substitutions that would so invalidate a component clause when the
6127 specified position is byte aligned, as the change would have no
6128 real benefit from the packing standpoint anyway. */
6129 || (Is_Aliased (gnat_field)
6130 && has_byte_aligned_clause
6131 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6133 /* Substitute unless told otherwise. */
6136 gnu_field_type = gnu_packable_type;
6139 gnu_size = rm_size (gnu_field_type);
6143 /* If we are packing the record and the field is BLKmode, round the
6144 size up to a byte boundary. */
6145 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6146 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6148 if (Present (Component_Clause (gnat_field)))
6150 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6151 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6152 gnat_field, FIELD_DECL, false, true);
6154 /* Ensure the position does not overlap with the parent subtype,
6156 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6159 = gnat_to_gnu_type (Parent_Subtype
6160 (Underlying_Type (Scope (gnat_field))));
6162 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6163 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6166 ("offset of& must be beyond parent{, minimum allowed is ^}",
6167 First_Bit (Component_Clause (gnat_field)), gnat_field,
6168 TYPE_SIZE_UNIT (gnu_parent));
6172 /* If this field needs strict alignment, ensure the record is
6173 sufficiently aligned and that that position and size are
6174 consistent with the alignment. */
6175 if (needs_strict_alignment)
6177 TYPE_ALIGN (gnu_record_type)
6178 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6181 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6183 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6185 ("atomic field& must be natural size of type{ (^)}",
6186 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6187 TYPE_SIZE (gnu_field_type));
6189 else if (Is_Aliased (gnat_field))
6191 ("size of aliased field& must be ^ bits",
6192 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6193 TYPE_SIZE (gnu_field_type));
6195 else if (Strict_Alignment (Etype (gnat_field)))
6197 ("size of & with aliased or tagged components not ^ bits",
6198 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6199 TYPE_SIZE (gnu_field_type));
6201 gnu_size = NULL_TREE;
6204 if (!integer_zerop (size_binop
6205 (TRUNC_MOD_EXPR, gnu_pos,
6206 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6208 if (Is_Aliased (gnat_field))
6210 ("position of aliased field& must be multiple of ^ bits",
6211 First_Bit (Component_Clause (gnat_field)), gnat_field,
6212 TYPE_ALIGN (gnu_field_type));
6214 else if (Treat_As_Volatile (gnat_field))
6216 ("position of volatile field& must be multiple of ^ bits",
6217 First_Bit (Component_Clause (gnat_field)), gnat_field,
6218 TYPE_ALIGN (gnu_field_type));
6220 else if (Strict_Alignment (Etype (gnat_field)))
6222 ("position of & with aliased or tagged components not multiple of ^ bits",
6223 First_Bit (Component_Clause (gnat_field)), gnat_field,
6224 TYPE_ALIGN (gnu_field_type));
6229 gnu_pos = NULL_TREE;
6233 if (Is_Atomic (gnat_field))
6234 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6237 /* If the record has rep clauses and this is the tag field, make a rep
6238 clause for it as well. */
6239 else if (Has_Specified_Layout (Scope (gnat_field))
6240 && Chars (gnat_field) == Name_uTag)
6242 gnu_pos = bitsize_zero_node;
6243 gnu_size = TYPE_SIZE (gnu_field_type);
6247 gnu_pos = NULL_TREE;
6249 /* We need to make the size the maximum for the type if it is
6250 self-referential and an unconstrained type. In that case, we can't
6251 pack the field since we can't make a copy to align it. */
6252 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6254 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6255 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6257 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6261 /* If a size is specified, adjust the field's type to it. */
6264 /* If the field's type is justified modular, we would need to remove
6265 the wrapper to (better) meet the layout requirements. However we
6266 can do so only if the field is not aliased to preserve the unique
6267 layout and if the prescribed size is not greater than that of the
6268 packed array to preserve the justification. */
6269 if (!needs_strict_alignment
6270 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6271 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6272 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6274 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6277 = make_type_from_size (gnu_field_type, gnu_size,
6278 Has_Biased_Representation (gnat_field));
6279 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6280 "PAD", false, definition, true);
6283 /* Otherwise (or if there was an error), don't specify a position. */
6285 gnu_pos = NULL_TREE;
6287 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6288 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6290 /* Now create the decl for the field. */
6291 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6292 packed, gnu_size, gnu_pos,
6293 Is_Aliased (gnat_field));
6294 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6295 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6297 if (Ekind (gnat_field) == E_Discriminant)
6298 DECL_DISCRIMINANT_NUMBER (gnu_field)
6299 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6304 /* Return true if TYPE is a type with variable size, a padding type with a
6305 field of variable size or is a record that has a field such a field. */
6308 is_variable_size (tree type)
6312 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6315 if (TREE_CODE (type) == RECORD_TYPE
6316 && TYPE_IS_PADDING_P (type)
6317 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6320 if (TREE_CODE (type) != RECORD_TYPE
6321 && TREE_CODE (type) != UNION_TYPE
6322 && TREE_CODE (type) != QUAL_UNION_TYPE)
6325 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6326 if (is_variable_size (TREE_TYPE (field)))
6332 /* qsort comparer for the bit positions of two record components. */
6335 compare_field_bitpos (const PTR rt1, const PTR rt2)
6337 const_tree const field1 = * (const_tree const *) rt1;
6338 const_tree const field2 = * (const_tree const *) rt2;
6340 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6342 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6345 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
6346 of GCC trees for fields that are in the record and have already been
6347 processed. When called from gnat_to_gnu_entity during the processing of a
6348 record type definition, the GCC nodes for the discriminants will be on
6349 the chain. The other calls to this function are recursive calls from
6350 itself for the Component_List of a variant and the chain is empty.
6352 PACKED is 1 if this is for a packed record, -1 if this is for a record
6353 with Component_Alignment of Storage_Unit, -2 if this is for a record
6354 with a specified alignment.
6356 DEFINITION is true if we are defining this record.
6358 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6359 with a rep clause is to be added. If it is nonzero, that is all that
6360 should be done with such fields.
6362 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6363 laying out the record. This means the alignment only serves to force fields
6364 to be bitfields, but not require the record to be that aligned. This is
6367 ALL_REP, if true, means a rep clause was found for all the fields. This
6368 simplifies the logic since we know we're not in the mixed case.
6370 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6371 modified afterwards so it will not be sent to the back-end for finalization.
6373 UNCHECKED_UNION, if true, means that we are building a type for a record
6374 with a Pragma Unchecked_Union.
6376 The processing of the component list fills in the chain with all of the
6377 fields of the record and then the record type is finished. */
6380 components_to_record (tree gnu_record_type, Node_Id component_list,
6381 tree gnu_field_list, int packed, bool definition,
6382 tree *p_gnu_rep_list, bool cancel_alignment,
6383 bool all_rep, bool do_not_finalize, bool unchecked_union)
6385 Node_Id component_decl;
6386 Entity_Id gnat_field;
6387 Node_Id variant_part;
6388 tree gnu_our_rep_list = NULL_TREE;
6389 tree gnu_field, gnu_last;
6390 bool layout_with_rep = false;
6391 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6393 /* For each variable within each component declaration create a GCC field
6394 and add it to the list, skipping any pragmas in the list. */
6395 if (Present (Component_Items (component_list)))
6396 for (component_decl = First_Non_Pragma (Component_Items (component_list));
6397 Present (component_decl);
6398 component_decl = Next_Non_Pragma (component_decl))
6400 gnat_field = Defining_Entity (component_decl);
6402 if (Chars (gnat_field) == Name_uParent)
6403 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
6406 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6407 packed, definition);
6409 /* If this is the _Tag field, put it before any discriminants,
6410 instead of after them as is the case for all other fields.
6411 Ignore field of void type if only annotating. */
6412 if (Chars (gnat_field) == Name_uTag)
6413 gnu_field_list = chainon (gnu_field_list, gnu_field);
6416 TREE_CHAIN (gnu_field) = gnu_field_list;
6417 gnu_field_list = gnu_field;
6421 save_gnu_tree (gnat_field, gnu_field, false);
6424 /* At the end of the component list there may be a variant part. */
6425 variant_part = Variant_Part (component_list);
6427 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6428 mutually exclusive and should go in the same memory. To do this we need
6429 to treat each variant as a record whose elements are created from the
6430 component list for the variant. So here we create the records from the
6431 lists for the variants and put them all into the QUAL_UNION_TYPE.
6432 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6433 use GNU_RECORD_TYPE if there are no fields so far. */
6434 if (Present (variant_part))
6436 tree gnu_discriminant = gnat_to_gnu (Name (variant_part));
6438 tree gnu_name = TYPE_NAME (gnu_record_type);
6440 = concat_id_with_name (get_identifier (Get_Name_String
6441 (Chars (Name (variant_part)))),
6443 tree gnu_union_type;
6444 tree gnu_union_name;
6445 tree gnu_union_field;
6446 tree gnu_variant_list = NULL_TREE;
6448 if (TREE_CODE (gnu_name) == TYPE_DECL)
6449 gnu_name = DECL_NAME (gnu_name);
6451 gnu_union_name = concat_id_with_name (gnu_name,
6452 IDENTIFIER_POINTER (gnu_var_name));
6454 /* Reuse an enclosing union if all fields are in the variant part
6455 and there is no representation clause on the record, to match
6456 the layout of C unions. There is an associated check below. */
6458 && TREE_CODE (gnu_record_type) == UNION_TYPE
6459 && !TYPE_PACKED (gnu_record_type))
6460 gnu_union_type = gnu_record_type;
6464 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6466 TYPE_NAME (gnu_union_type) = gnu_union_name;
6467 TYPE_ALIGN (gnu_union_type) = 0;
6468 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6471 for (variant = First_Non_Pragma (Variants (variant_part));
6473 variant = Next_Non_Pragma (variant))
6475 tree gnu_variant_type = make_node (RECORD_TYPE);
6476 tree gnu_inner_name;
6479 Get_Variant_Encoding (variant);
6480 gnu_inner_name = get_identifier (Name_Buffer);
6481 TYPE_NAME (gnu_variant_type)
6482 = concat_id_with_name (gnu_union_name,
6483 IDENTIFIER_POINTER (gnu_inner_name));
6485 /* Set the alignment of the inner type in case we need to make
6486 inner objects into bitfields, but then clear it out
6487 so the record actually gets only the alignment required. */
6488 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6489 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6491 /* Similarly, if the outer record has a size specified and all fields
6492 have record rep clauses, we can propagate the size into the
6494 if (all_rep_and_size)
6496 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6497 TYPE_SIZE_UNIT (gnu_variant_type)
6498 = TYPE_SIZE_UNIT (gnu_record_type);
6501 /* Create the record type for the variant. Note that we defer
6502 finalizing it until after we are sure to actually use it. */
6503 components_to_record (gnu_variant_type, Component_List (variant),
6504 NULL_TREE, packed, definition,
6505 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6506 true, unchecked_union);
6508 gnu_qual = choices_to_gnu (gnu_discriminant,
6509 Discrete_Choices (variant));
6511 Set_Present_Expr (variant, annotate_value (gnu_qual));
6513 /* If this is an Unchecked_Union and we have exactly one field,
6514 use this field directly to match the layout of C unions. */
6516 && TYPE_FIELDS (gnu_variant_type)
6517 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6518 gnu_field = TYPE_FIELDS (gnu_variant_type);
6521 /* Deal with packedness like in gnat_to_gnu_field. */
6523 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6525 /* Finalize the record type now. We used to throw away
6526 empty records but we no longer do that because we need
6527 them to generate complete debug info for the variant;
6528 otherwise, the union type definition will be lacking
6529 the fields associated with these empty variants. */
6530 rest_of_record_type_compilation (gnu_variant_type);
6532 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6533 gnu_union_type, field_packed,
6535 ? TYPE_SIZE (gnu_variant_type)
6538 ? bitsize_zero_node : 0),
6541 DECL_INTERNAL_P (gnu_field) = 1;
6543 if (!unchecked_union)
6544 DECL_QUALIFIER (gnu_field) = gnu_qual;
6547 TREE_CHAIN (gnu_field) = gnu_variant_list;
6548 gnu_variant_list = gnu_field;
6551 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
6552 if (gnu_variant_list)
6554 int union_field_packed;
6556 if (all_rep_and_size)
6558 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6559 TYPE_SIZE_UNIT (gnu_union_type)
6560 = TYPE_SIZE_UNIT (gnu_record_type);
6563 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6564 all_rep_and_size ? 1 : 0, false);
6566 /* If GNU_UNION_TYPE is our record type, it means we must have an
6567 Unchecked_Union with no fields. Verify that and, if so, just
6569 if (gnu_union_type == gnu_record_type)
6571 gcc_assert (unchecked_union
6573 && !gnu_our_rep_list);
6577 /* Deal with packedness like in gnat_to_gnu_field. */
6579 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6582 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6584 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6585 all_rep ? bitsize_zero_node : 0, 0);
6587 DECL_INTERNAL_P (gnu_union_field) = 1;
6588 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6589 gnu_field_list = gnu_union_field;
6593 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6594 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
6595 in a separate pass since we want to handle the discriminants but can't
6596 play with them until we've used them in debugging data above.
6598 ??? Note: if we then reorder them, debugging information will be wrong,
6599 but there's nothing that can be done about this at the moment. */
6600 for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; )
6602 if (DECL_FIELD_OFFSET (gnu_field))
6604 tree gnu_next = TREE_CHAIN (gnu_field);
6607 gnu_field_list = gnu_next;
6609 TREE_CHAIN (gnu_last) = gnu_next;
6611 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6612 gnu_our_rep_list = gnu_field;
6613 gnu_field = gnu_next;
6617 gnu_last = gnu_field;
6618 gnu_field = TREE_CHAIN (gnu_field);
6622 /* If we have any items in our rep'ed field list, it is not the case that all
6623 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
6624 set it and ignore the items. */
6625 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6626 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6627 else if (gnu_our_rep_list)
6629 /* Otherwise, sort the fields by bit position and put them into their
6630 own record if we have any fields without rep clauses. */
6632 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6633 int len = list_length (gnu_our_rep_list);
6634 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6637 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
6638 gnu_field = TREE_CHAIN (gnu_field), i++)
6639 gnu_arr[i] = gnu_field;
6641 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6643 /* Put the fields in the list in order of increasing position, which
6644 means we start from the end. */
6645 gnu_our_rep_list = NULL_TREE;
6646 for (i = len - 1; i >= 0; i--)
6648 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6649 gnu_our_rep_list = gnu_arr[i];
6650 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
6655 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
6656 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
6657 gnu_record_type, 0, 0, 0, 1);
6658 DECL_INTERNAL_P (gnu_field) = 1;
6659 gnu_field_list = chainon (gnu_field_list, gnu_field);
6663 layout_with_rep = true;
6664 gnu_field_list = nreverse (gnu_our_rep_list);
6668 if (cancel_alignment)
6669 TYPE_ALIGN (gnu_record_type) = 0;
6671 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
6672 layout_with_rep ? 1 : 0, do_not_finalize);
6675 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
6676 placed into an Esize, Component_Bit_Offset, or Component_Size value
6677 in the GNAT tree. */
6680 annotate_value (tree gnu_size)
6682 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
6684 Node_Ref_Or_Val ops[3], ret;
6687 struct tree_int_map **h = NULL;
6689 /* See if we've already saved the value for this node. */
6690 if (EXPR_P (gnu_size))
6692 struct tree_int_map in;
6693 if (!annotate_value_cache)
6694 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
6695 tree_int_map_eq, 0);
6696 in.base.from = gnu_size;
6697 h = (struct tree_int_map **)
6698 htab_find_slot (annotate_value_cache, &in, INSERT);
6701 return (Node_Ref_Or_Val) (*h)->to;
6704 /* If we do not return inside this switch, TCODE will be set to the
6705 code to use for a Create_Node operand and LEN (set above) will be
6706 the number of recursive calls for us to make. */
6708 switch (TREE_CODE (gnu_size))
6711 if (TREE_OVERFLOW (gnu_size))
6714 /* This may have come from a conversion from some smaller type,
6715 so ensure this is in bitsizetype. */
6716 gnu_size = convert (bitsizetype, gnu_size);
6718 /* For negative values, use NEGATE_EXPR of the supplied value. */
6719 if (tree_int_cst_sgn (gnu_size) < 0)
6721 /* The ridiculous code below is to handle the case of the largest
6722 negative integer. */
6723 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
6724 bool adjust = false;
6727 if (TREE_OVERFLOW (negative_size))
6730 = size_binop (MINUS_EXPR, bitsize_zero_node,
6731 size_binop (PLUS_EXPR, gnu_size,
6736 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
6738 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
6740 return annotate_value (temp);
6743 if (!host_integerp (gnu_size, 1))
6746 size = tree_low_cst (gnu_size, 1);
6748 /* This peculiar test is to make sure that the size fits in an int
6749 on machines where HOST_WIDE_INT is not "int". */
6750 if (tree_low_cst (gnu_size, 1) == size)
6751 return UI_From_Int (size);
6756 /* The only case we handle here is a simple discriminant reference. */
6757 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
6758 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
6759 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
6760 return Create_Node (Discrim_Val,
6761 annotate_value (DECL_DISCRIMINANT_NUMBER
6762 (TREE_OPERAND (gnu_size, 1))),
6767 CASE_CONVERT: case NON_LVALUE_EXPR:
6768 return annotate_value (TREE_OPERAND (gnu_size, 0));
6770 /* Now just list the operations we handle. */
6771 case COND_EXPR: tcode = Cond_Expr; break;
6772 case PLUS_EXPR: tcode = Plus_Expr; break;
6773 case MINUS_EXPR: tcode = Minus_Expr; break;
6774 case MULT_EXPR: tcode = Mult_Expr; break;
6775 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
6776 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
6777 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
6778 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
6779 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
6780 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
6781 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
6782 case NEGATE_EXPR: tcode = Negate_Expr; break;
6783 case MIN_EXPR: tcode = Min_Expr; break;
6784 case MAX_EXPR: tcode = Max_Expr; break;
6785 case ABS_EXPR: tcode = Abs_Expr; break;
6786 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
6787 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
6788 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
6789 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
6790 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
6791 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
6792 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
6793 case LT_EXPR: tcode = Lt_Expr; break;
6794 case LE_EXPR: tcode = Le_Expr; break;
6795 case GT_EXPR: tcode = Gt_Expr; break;
6796 case GE_EXPR: tcode = Ge_Expr; break;
6797 case EQ_EXPR: tcode = Eq_Expr; break;
6798 case NE_EXPR: tcode = Ne_Expr; break;
6804 /* Now get each of the operands that's relevant for this code. If any
6805 cannot be expressed as a repinfo node, say we can't. */
6806 for (i = 0; i < 3; i++)
6809 for (i = 0; i < len; i++)
6811 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
6812 if (ops[i] == No_Uint)
6816 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
6818 /* Save the result in the cache. */
6821 *h = GGC_NEW (struct tree_int_map);
6822 (*h)->base.from = gnu_size;
6829 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
6830 GCC type, set Component_Bit_Offset and Esize to the position and size
6834 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
6838 Entity_Id gnat_field;
6840 /* We operate by first making a list of all fields and their positions
6841 (we can get the sizes easily at any time) by a recursive call
6842 and then update all the sizes into the tree. */
6843 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
6844 size_zero_node, bitsize_zero_node,
6847 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
6848 gnat_field = Next_Entity (gnat_field))
6849 if ((Ekind (gnat_field) == E_Component
6850 || (Ekind (gnat_field) == E_Discriminant
6851 && !Is_Unchecked_Union (Scope (gnat_field)))))
6853 tree parent_offset = bitsize_zero_node;
6855 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
6860 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
6862 /* In this mode the tag and parent components have not been
6863 generated, so we add the appropriate offset to each
6864 component. For a component appearing in the current
6865 extension, the offset is the size of the parent. */
6866 if (Is_Derived_Type (gnat_entity)
6867 && Original_Record_Component (gnat_field) == gnat_field)
6869 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
6872 parent_offset = bitsize_int (POINTER_SIZE);
6875 Set_Component_Bit_Offset
6878 (size_binop (PLUS_EXPR,
6879 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
6880 TREE_VALUE (TREE_VALUE
6881 (TREE_VALUE (gnu_entry)))),
6884 Set_Esize (gnat_field,
6885 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
6887 else if (Is_Tagged_Type (gnat_entity)
6888 && Is_Derived_Type (gnat_entity))
6890 /* If there is no gnu_entry, this is an inherited component whose
6891 position is the same as in the parent type. */
6892 Set_Component_Bit_Offset
6894 Component_Bit_Offset (Original_Record_Component (gnat_field)));
6895 Set_Esize (gnat_field,
6896 Esize (Original_Record_Component (gnat_field)));
6901 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
6902 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
6903 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
6904 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
6905 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
6906 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
6910 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
6911 tree gnu_bitpos, unsigned int offset_align)
6914 tree gnu_result = gnu_list;
6916 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
6917 gnu_field = TREE_CHAIN (gnu_field))
6919 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
6920 DECL_FIELD_BIT_OFFSET (gnu_field));
6921 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
6922 DECL_FIELD_OFFSET (gnu_field));
6923 unsigned int our_offset_align
6924 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
6927 = tree_cons (gnu_field,
6928 tree_cons (gnu_our_offset,
6929 tree_cons (size_int (our_offset_align),
6930 gnu_our_bitpos, NULL_TREE),
6934 if (DECL_INTERNAL_P (gnu_field))
6936 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
6937 gnu_our_offset, gnu_our_bitpos,
6944 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
6945 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
6946 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
6947 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
6948 for the size of a field. COMPONENT_P is true if we are being called
6949 to process the Component_Size of GNAT_OBJECT. This is used for error
6950 message handling and to indicate to use the object size of GNU_TYPE.
6951 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
6952 it means that a size of zero should be treated as an unspecified size. */
6955 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
6956 enum tree_code kind, bool component_p, bool zero_ok)
6958 Node_Id gnat_error_node;
6959 tree type_size, size;
6961 if (kind == VAR_DECL
6962 /* If a type needs strict alignment, a component of this type in
6963 a packed record cannot be packed and thus uses the type size. */
6964 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
6965 type_size = TYPE_SIZE (gnu_type);
6967 type_size = rm_size (gnu_type);
6969 /* Find the node to use for errors. */
6970 if ((Ekind (gnat_object) == E_Component
6971 || Ekind (gnat_object) == E_Discriminant)
6972 && Present (Component_Clause (gnat_object)))
6973 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
6974 else if (Present (Size_Clause (gnat_object)))
6975 gnat_error_node = Expression (Size_Clause (gnat_object));
6977 gnat_error_node = gnat_object;
6979 /* Return 0 if no size was specified, either because Esize was not Present or
6980 the specified size was zero. */
6981 if (No (uint_size) || uint_size == No_Uint)
6984 /* Get the size as a tree. Give an error if a size was specified, but cannot
6985 be represented as in sizetype. */
6986 size = UI_To_gnu (uint_size, bitsizetype);
6987 if (TREE_OVERFLOW (size))
6989 post_error_ne (component_p ? "component size of & is too large"
6990 : "size of & is too large",
6991 gnat_error_node, gnat_object);
6995 /* Ignore a negative size since that corresponds to our back-annotation.
6996 Also ignore a zero size unless a size clause exists. */
6997 else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7000 /* The size of objects is always a multiple of a byte. */
7001 if (kind == VAR_DECL
7002 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7005 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7006 gnat_error_node, gnat_object);
7008 post_error_ne ("size for& is not a multiple of Storage_Unit",
7009 gnat_error_node, gnat_object);
7013 /* If this is an integral type or a packed array type, the front-end has
7014 verified the size, so we need not do it here (which would entail
7015 checking against the bounds). However, if this is an aliased object, it
7016 may not be smaller than the type of the object. */
7017 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7018 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7021 /* If the object is a record that contains a template, add the size of
7022 the template to the specified size. */
7023 if (TREE_CODE (gnu_type) == RECORD_TYPE
7024 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7025 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7027 /* Modify the size of the type to be that of the maximum size if it has a
7029 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7030 type_size = max_size (type_size, true);
7032 /* If this is an access type or a fat pointer, the minimum size is that given
7033 by the smallest integral mode that's valid for pointers. */
7034 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7036 enum machine_mode p_mode;
7038 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7039 !targetm.valid_pointer_mode (p_mode);
7040 p_mode = GET_MODE_WIDER_MODE (p_mode))
7043 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7046 /* If the size of the object is a constant, the new size must not be
7048 if (TREE_CODE (type_size) != INTEGER_CST
7049 || TREE_OVERFLOW (type_size)
7050 || tree_int_cst_lt (size, type_size))
7054 ("component size for& too small{, minimum allowed is ^}",
7055 gnat_error_node, gnat_object, type_size);
7057 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7058 gnat_error_node, gnat_object, type_size);
7060 if (kind == VAR_DECL && !component_p
7061 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7062 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7063 post_error_ne_tree_2
7064 ("\\size of ^ is not a multiple of alignment (^ bits)",
7065 gnat_error_node, gnat_object, rm_size (gnu_type),
7066 TYPE_ALIGN (gnu_type));
7068 else if (INTEGRAL_TYPE_P (gnu_type))
7069 post_error_ne ("\\size would be legal if & were not aliased!",
7070 gnat_error_node, gnat_object);
7078 /* Similarly, but both validate and process a value of RM_Size. This
7079 routine is only called for types. */
7082 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7084 /* Only give an error if a Value_Size clause was explicitly given.
7085 Otherwise, we'd be duplicating an error on the Size clause. */
7086 Node_Id gnat_attr_node
7087 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7088 tree old_size = rm_size (gnu_type);
7091 /* Get the size as a tree. Do nothing if none was specified, either
7092 because RM_Size was not Present or if the specified size was zero.
7093 Give an error if a size was specified, but cannot be represented as
7095 if (No (uint_size) || uint_size == No_Uint)
7098 size = UI_To_gnu (uint_size, bitsizetype);
7099 if (TREE_OVERFLOW (size))
7101 if (Present (gnat_attr_node))
7102 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7108 /* Ignore a negative size since that corresponds to our back-annotation.
7109 Also ignore a zero size unless a size clause exists, a Value_Size
7110 clause exists, or this is an integer type, in which case the
7111 front end will have always set it. */
7112 else if (tree_int_cst_sgn (size) < 0
7113 || (integer_zerop (size) && No (gnat_attr_node)
7114 && !Has_Size_Clause (gnat_entity)
7115 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7118 /* If the old size is self-referential, get the maximum size. */
7119 if (CONTAINS_PLACEHOLDER_P (old_size))
7120 old_size = max_size (old_size, true);
7122 /* If the size of the object is a constant, the new size must not be
7123 smaller (the front end checks this for scalar types). */
7124 if (TREE_CODE (old_size) != INTEGER_CST
7125 || TREE_OVERFLOW (old_size)
7126 || (AGGREGATE_TYPE_P (gnu_type)
7127 && tree_int_cst_lt (size, old_size)))
7129 if (Present (gnat_attr_node))
7131 ("Value_Size for& too small{, minimum allowed is ^}",
7132 gnat_attr_node, gnat_entity, old_size);
7137 /* Otherwise, set the RM_Size. */
7138 if (TREE_CODE (gnu_type) == INTEGER_TYPE
7139 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7140 TYPE_RM_SIZE_NUM (gnu_type) = size;
7141 else if (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7142 || TREE_CODE (gnu_type) == BOOLEAN_TYPE)
7143 TYPE_RM_SIZE_NUM (gnu_type) = size;
7144 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7145 || TREE_CODE (gnu_type) == UNION_TYPE
7146 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7147 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7148 SET_TYPE_ADA_SIZE (gnu_type, size);
7151 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7152 If TYPE is the best type, return it. Otherwise, make a new type. We
7153 only support new integral and pointer types. FOR_BIASED is nonzero if
7154 we are making a biased type. */
7157 make_type_from_size (tree type, tree size_tree, bool for_biased)
7159 unsigned HOST_WIDE_INT size;
7160 bool biased_p, boolean_p;
7163 /* If size indicates an error, just return TYPE to avoid propagating
7164 the error. Likewise if it's too large to represent. */
7165 if (!size_tree || !host_integerp (size_tree, 1))
7168 size = tree_low_cst (size_tree, 1);
7170 switch (TREE_CODE (type))
7175 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7176 && TYPE_BIASED_REPRESENTATION_P (type));
7178 boolean_p = (TREE_CODE (type) == BOOLEAN_TYPE
7179 || (TREE_CODE (type) == INTEGER_TYPE
7181 && TREE_CODE (TREE_TYPE (type)) == BOOLEAN_TYPE));
7184 size = round_up_to_align (size, BITS_PER_UNIT);
7186 /* Only do something if the type is not a packed array type and
7187 doesn't already have the proper size. */
7188 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7189 || (biased_p == for_biased && TYPE_PRECISION (type) == size)
7190 || (boolean_p && compare_tree_int (TYPE_SIZE (type), size) == 0))
7193 biased_p |= for_biased;
7194 size = MIN (size, LONG_LONG_TYPE_SIZE);
7196 if (TYPE_UNSIGNED (type) || biased_p)
7197 new_type = make_unsigned_type (size);
7199 new_type = make_signed_type (size);
7201 TYPE_PRECISION (new_type) = 1;
7202 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7203 TYPE_MIN_VALUE (new_type)
7204 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
7205 TYPE_MAX_VALUE (new_type)
7206 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
7207 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7209 TYPE_RM_SIZE_NUM (new_type) = bitsize_int (1);
7211 TYPE_RM_SIZE_NUM (new_type) = bitsize_int (size);
7215 /* Do something if this is a fat pointer, in which case we
7216 may need to return the thin pointer. */
7217 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7219 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7220 if (!targetm.valid_pointer_mode (p_mode))
7223 build_pointer_type_for_mode
7224 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7230 /* Only do something if this is a thin pointer, in which case we
7231 may need to return the fat pointer. */
7232 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7234 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7244 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7245 a type or object whose present alignment is ALIGN. If this alignment is
7246 valid, return it. Otherwise, give an error and return ALIGN. */
7249 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7251 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7252 unsigned int new_align;
7253 Node_Id gnat_error_node;
7255 /* Don't worry about checking alignment if alignment was not specified
7256 by the source program and we already posted an error for this entity. */
7257 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7260 /* Post the error on the alignment clause if any. */
7261 if (Present (Alignment_Clause (gnat_entity)))
7262 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7264 gnat_error_node = gnat_entity;
7266 /* Within GCC, an alignment is an integer, so we must make sure a value is
7267 specified that fits in that range. Also, there is an upper bound to
7268 alignments we can support/allow. */
7269 if (!UI_Is_In_Int_Range (alignment)
7270 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7271 post_error_ne_num ("largest supported alignment for& is ^",
7272 gnat_error_node, gnat_entity, max_allowed_alignment);
7273 else if (!(Present (Alignment_Clause (gnat_entity))
7274 && From_At_Mod (Alignment_Clause (gnat_entity)))
7275 && new_align * BITS_PER_UNIT < align)
7276 post_error_ne_num ("alignment for& must be at least ^",
7277 gnat_error_node, gnat_entity,
7278 align / BITS_PER_UNIT);
7281 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7282 if (new_align > align)
7289 /* Return the smallest alignment not less than SIZE. */
7292 ceil_alignment (unsigned HOST_WIDE_INT size)
7294 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7297 /* Verify that OBJECT, a type or decl, is something we can implement
7298 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7299 if we require atomic components. */
7302 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7304 Node_Id gnat_error_point = gnat_entity;
7306 enum machine_mode mode;
7310 /* There are three case of what OBJECT can be. It can be a type, in which
7311 case we take the size, alignment and mode from the type. It can be a
7312 declaration that was indirect, in which case the relevant values are
7313 that of the type being pointed to, or it can be a normal declaration,
7314 in which case the values are of the decl. The code below assumes that
7315 OBJECT is either a type or a decl. */
7316 if (TYPE_P (object))
7318 mode = TYPE_MODE (object);
7319 align = TYPE_ALIGN (object);
7320 size = TYPE_SIZE (object);
7322 else if (DECL_BY_REF_P (object))
7324 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7325 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7326 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7330 mode = DECL_MODE (object);
7331 align = DECL_ALIGN (object);
7332 size = DECL_SIZE (object);
7335 /* Consider all floating-point types atomic and any types that that are
7336 represented by integers no wider than a machine word. */
7337 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7338 || ((GET_MODE_CLASS (mode) == MODE_INT
7339 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7340 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7343 /* For the moment, also allow anything that has an alignment equal
7344 to its size and which is smaller than a word. */
7345 if (size && TREE_CODE (size) == INTEGER_CST
7346 && compare_tree_int (size, align) == 0
7347 && align <= BITS_PER_WORD)
7350 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7351 gnat_node = Next_Rep_Item (gnat_node))
7353 if (!comp_p && Nkind (gnat_node) == N_Pragma
7354 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7356 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7357 else if (comp_p && Nkind (gnat_node) == N_Pragma
7358 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7359 == Pragma_Atomic_Components))
7360 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7364 post_error_ne ("atomic access to component of & cannot be guaranteed",
7365 gnat_error_point, gnat_entity);
7367 post_error_ne ("atomic access to & cannot be guaranteed",
7368 gnat_error_point, gnat_entity);
7371 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7372 have compatible signatures so that a call using one type may be safely
7373 issued if the actual target function type is the other. Return 1 if it is
7374 the case, 0 otherwise, and post errors on the incompatibilities.
7376 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7377 that calls to the subprogram will have arguments suitable for the later
7378 underlying builtin expansion. */
7381 compatible_signatures_p (tree ftype1, tree ftype2)
7383 /* As of now, we only perform very trivial tests and consider it's the
7384 programmer's responsibility to ensure the type correctness in the Ada
7385 declaration, as in the regular Import cases.
7387 Mismatches typically result in either error messages from the builtin
7388 expander, internal compiler errors, or in a real call sequence. This
7389 should be refined to issue diagnostics helping error detection and
7392 /* Almost fake test, ensuring a use of each argument. */
7393 if (ftype1 == ftype2)
7399 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a new
7400 type with all size expressions that contain F updated by replacing F
7401 with R. If F is NULL_TREE, always make a new RECORD_TYPE, even if
7402 nothing has changed. */
7405 substitute_in_type (tree t, tree f, tree r)
7410 switch (TREE_CODE (t))
7415 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7416 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7418 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7419 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7421 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7424 new = build_range_type (TREE_TYPE (t), low, high);
7425 if (TYPE_INDEX_TYPE (t))
7427 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7434 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7435 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7437 tree low = NULL_TREE, high = NULL_TREE;
7439 if (TYPE_MIN_VALUE (t))
7440 low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7441 if (TYPE_MAX_VALUE (t))
7442 high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7444 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7448 TYPE_MIN_VALUE (t) = low;
7449 TYPE_MAX_VALUE (t) = high;
7454 tem = substitute_in_type (TREE_TYPE (t), f, r);
7455 if (tem == TREE_TYPE (t))
7458 return build_complex_type (tem);
7464 /* Don't know how to do these yet. */
7469 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7470 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7472 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7475 new = build_array_type (component, domain);
7476 TYPE_SIZE (new) = 0;
7477 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7478 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7480 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7481 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7483 /* If we had bounded the sizes of T by a constant, bound the sizes of
7484 NEW by the same constant. */
7485 if (TREE_CODE (TYPE_SIZE (t)) == MIN_EXPR)
7487 = size_binop (MIN_EXPR, TREE_OPERAND (TYPE_SIZE (t), 1),
7489 if (TREE_CODE (TYPE_SIZE_UNIT (t)) == MIN_EXPR)
7490 TYPE_SIZE_UNIT (new)
7491 = size_binop (MIN_EXPR, TREE_OPERAND (TYPE_SIZE_UNIT (t), 1),
7492 TYPE_SIZE_UNIT (new));
7498 case QUAL_UNION_TYPE:
7502 = (f == NULL_TREE && !TREE_CONSTANT (TYPE_SIZE (t)));
7503 bool field_has_rep = false;
7504 tree last_field = NULL_TREE;
7506 tree new = copy_type (t);
7508 /* Start out with no fields, make new fields, and chain them
7509 in. If we haven't actually changed the type of any field,
7510 discard everything we've done and return the old type. */
7512 TYPE_FIELDS (new) = NULL_TREE;
7513 TYPE_SIZE (new) = NULL_TREE;
7515 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7517 tree new_field = copy_node (field);
7519 TREE_TYPE (new_field)
7520 = substitute_in_type (TREE_TYPE (new_field), f, r);
7522 if (DECL_HAS_REP_P (field) && !DECL_INTERNAL_P (field))
7523 field_has_rep = true;
7524 else if (TREE_TYPE (new_field) != TREE_TYPE (field))
7525 changed_field = true;
7527 /* If this is an internal field and the type of this field is
7528 a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If
7529 the type just has one element, treat that as the field.
7530 But don't do this if we are processing a QUAL_UNION_TYPE. */
7531 if (TREE_CODE (t) != QUAL_UNION_TYPE
7532 && DECL_INTERNAL_P (new_field)
7533 && (TREE_CODE (TREE_TYPE (new_field)) == UNION_TYPE
7534 || TREE_CODE (TREE_TYPE (new_field)) == RECORD_TYPE))
7536 if (!TYPE_FIELDS (TREE_TYPE (new_field)))
7539 if (!TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field))))
7542 = copy_node (TYPE_FIELDS (TREE_TYPE (new_field)));
7544 /* Make sure omitting the union doesn't change
7546 DECL_ALIGN (next_new_field) = DECL_ALIGN (new_field);
7547 new_field = next_new_field;
7551 DECL_CONTEXT (new_field) = new;
7552 SET_DECL_ORIGINAL_FIELD (new_field,
7553 (DECL_ORIGINAL_FIELD (field)
7554 ? DECL_ORIGINAL_FIELD (field) : field));
7556 /* If the size of the old field was set at a constant,
7557 propagate the size in case the type's size was variable.
7558 (This occurs in the case of a variant or discriminated
7559 record with a default size used as a field of another
7561 DECL_SIZE (new_field)
7562 = TREE_CODE (DECL_SIZE (field)) == INTEGER_CST
7563 ? DECL_SIZE (field) : NULL_TREE;
7564 DECL_SIZE_UNIT (new_field)
7565 = TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST
7566 ? DECL_SIZE_UNIT (field) : NULL_TREE;
7568 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7570 tree new_q = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7572 if (new_q != DECL_QUALIFIER (new_field))
7573 changed_field = true;
7575 /* Do the substitution inside the qualifier and if we find
7576 that this field will not be present, omit it. */
7577 DECL_QUALIFIER (new_field) = new_q;
7579 if (integer_zerop (DECL_QUALIFIER (new_field)))
7584 TYPE_FIELDS (new) = new_field;
7586 TREE_CHAIN (last_field) = new_field;
7588 last_field = new_field;
7590 /* If this is a qualified type and this field will always be
7591 present, we are done. */
7592 if (TREE_CODE (t) == QUAL_UNION_TYPE
7593 && integer_onep (DECL_QUALIFIER (new_field)))
7597 /* If this used to be a qualified union type, but we now know what
7598 field will be present, make this a normal union. */
7599 if (changed_field && TREE_CODE (new) == QUAL_UNION_TYPE
7600 && (!TYPE_FIELDS (new)
7601 || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new)))))
7602 TREE_SET_CODE (new, UNION_TYPE);
7603 else if (!changed_field)
7606 gcc_assert (!field_has_rep);
7609 /* If the size was originally a constant use it. */
7610 if (TYPE_SIZE (t) && TREE_CODE (TYPE_SIZE (t)) == INTEGER_CST
7611 && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST)
7613 TYPE_SIZE (new) = TYPE_SIZE (t);
7614 TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t);
7615 SET_TYPE_ADA_SIZE (new, TYPE_ADA_SIZE (t));
7626 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
7627 needed to represent the object. */
7630 rm_size (tree gnu_type)
7632 /* For integer types, this is the precision. For record types, we store
7633 the size explicitly. For other types, this is just the size. */
7635 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7636 return TYPE_RM_SIZE (gnu_type);
7637 else if (TREE_CODE (gnu_type) == RECORD_TYPE
7638 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7639 /* Return the rm_size of the actual data plus the size of the template. */
7641 size_binop (PLUS_EXPR,
7642 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7643 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7644 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7645 || TREE_CODE (gnu_type) == UNION_TYPE
7646 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7647 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7648 && TYPE_ADA_SIZE (gnu_type))
7649 return TYPE_ADA_SIZE (gnu_type);
7651 return TYPE_SIZE (gnu_type);
7654 /* Return an identifier representing the external name to be used for
7655 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7656 and the specified suffix. */
7659 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7661 Entity_Kind kind = Ekind (gnat_entity);
7663 const char *str = (!suffix ? "" : suffix);
7664 String_Template temp = {1, strlen (str)};
7665 Fat_Pointer fp = {str, &temp};
7667 Get_External_Name_With_Suffix (gnat_entity, fp);
7669 /* A variable using the Stdcall convention (meaning we are running
7670 on a Windows box) live in a DLL. Here we adjust its name to use
7671 the jump-table, the _imp__NAME contains the address for the NAME
7673 if ((kind == E_Variable || kind == E_Constant)
7674 && Has_Stdcall_Convention (gnat_entity))
7676 const char *prefix = "_imp__";
7677 int k, plen = strlen (prefix);
7679 for (k = 0; k <= Name_Len; k++)
7680 Name_Buffer [Name_Len - k + plen] = Name_Buffer [Name_Len - k];
7681 strncpy (Name_Buffer, prefix, plen);
7684 return get_identifier (Name_Buffer);
7687 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7688 fully-qualified name, possibly with type information encoding.
7689 Otherwise, return the name. */
7692 get_entity_name (Entity_Id gnat_entity)
7694 Get_Encoded_Name (gnat_entity);
7695 return get_identifier (Name_Buffer);
7698 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
7699 string, return a new IDENTIFIER_NODE that is the concatenation of
7700 the name in GNU_ID and SUFFIX. */
7703 concat_id_with_name (tree gnu_id, const char *suffix)
7705 int len = IDENTIFIER_LENGTH (gnu_id);
7707 strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id), len);
7708 strncpy (Name_Buffer + len, "___", 3);
7710 strcpy (Name_Buffer + len, suffix);
7711 return get_identifier (Name_Buffer);
7714 #include "gt-ada-decl.h"