1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2009, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License along with GCC; see the file COPYING3. If not see *
19 * <http://www.gnu.org/licenses/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
28 #include "coretypes.h"
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;
125 static void relate_alias_sets (tree, tree, enum alias_set_op);
127 static tree substitution_list (Entity_Id, Entity_Id, tree, bool);
128 static bool allocatable_size_p (tree, bool);
129 static void prepend_one_attribute_to (struct attrib **,
130 enum attr_type, tree, tree, Node_Id);
131 static void prepend_attributes (Entity_Id, struct attrib **);
132 static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool);
133 static bool is_variable_size (tree);
134 static tree elaborate_expression_1 (Node_Id, Entity_Id, tree, tree,
136 static tree make_packable_type (tree, bool);
137 static tree gnat_to_gnu_field (Entity_Id, tree, int, bool);
138 static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool,
140 static bool same_discriminant_p (Entity_Id, Entity_Id);
141 static bool array_type_has_nonaliased_component (Entity_Id, tree);
142 static bool compile_time_known_address_p (Node_Id);
143 static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
144 bool, bool, bool, bool);
145 static Uint annotate_value (tree);
146 static void annotate_rep (Entity_Id, tree);
147 static tree compute_field_positions (tree, tree, tree, tree, unsigned int);
148 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
149 static void set_rm_size (Uint, tree, Entity_Id);
150 static tree make_type_from_size (tree, tree, bool);
151 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
152 static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
153 static void check_ok_for_atomic (tree, Entity_Id, bool);
154 static int compatible_signatures_p (tree ftype1, tree ftype2);
155 static void rest_of_type_decl_compilation_no_defer (tree);
157 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
158 entity, return the equivalent GCC tree for that entity (a ..._DECL node)
159 and associate the ..._DECL node with the input GNAT defining identifier.
161 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
162 initial value (in GCC tree form). This is optional for a variable. For
163 a renamed entity, GNU_EXPR gives the object being renamed.
165 DEFINITION is nonzero if this call is intended for a definition. This is
166 used for separate compilation where it is necessary to know whether an
167 external declaration or a definition must be created if the GCC equivalent
168 was not created previously. The value of 1 is normally used for a nonzero
169 DEFINITION, but a value of 2 is used in special circumstances, defined in
173 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
175 /* Contains the kind of the input GNAT node. */
176 const Entity_Kind kind = Ekind (gnat_entity);
177 /* True if this is a type. */
178 const bool is_type = IN (kind, Type_Kind);
179 /* For a type, contains the equivalent GNAT node to be used in gigi. */
180 Entity_Id gnat_equiv_type = Empty;
181 /* Temporary used to walk the GNAT tree. */
183 /* Contains the GCC DECL node which is equivalent to the input GNAT node.
184 This node will be associated with the GNAT node by calling at the end
185 of the `switch' statement. */
186 tree gnu_decl = NULL_TREE;
187 /* Contains the GCC type to be used for the GCC node. */
188 tree gnu_type = NULL_TREE;
189 /* Contains the GCC size tree to be used for the GCC node. */
190 tree gnu_size = NULL_TREE;
191 /* Contains the GCC name to be used for the GCC node. */
192 tree gnu_entity_name;
193 /* True if we have already saved gnu_decl as a GNAT association. */
195 /* True if we incremented defer_incomplete_level. */
196 bool this_deferred = false;
197 /* True if we incremented force_global. */
198 bool this_global = false;
199 /* True if we should check to see if elaborated during processing. */
200 bool maybe_present = false;
201 /* True if we made GNU_DECL and its type here. */
202 bool this_made_decl = false;
203 /* True if debug info is requested for this entity. */
204 bool debug_info_p = (Needs_Debug_Info (gnat_entity)
205 || debug_info_level == DINFO_LEVEL_VERBOSE);
206 /* True if this entity is to be considered as imported. */
207 bool imported_p = (Is_Imported (gnat_entity)
208 && No (Address_Clause (gnat_entity)));
209 /* Size and alignment of the GCC node, if meaningful. */
210 unsigned int esize = 0, align = 0;
211 /* Contains the list of attributes directly attached to the entity. */
212 struct attrib *attr_list = NULL;
214 /* Since a use of an Itype is a definition, process it as such if it
215 is not in a with'ed unit. */
218 && Is_Itype (gnat_entity)
219 && !present_gnu_tree (gnat_entity)
220 && In_Extended_Main_Code_Unit (gnat_entity))
222 /* Ensure that we are in a subprogram mentioned in the Scope chain of
223 this entity, our current scope is global, or we encountered a task
224 or entry (where we can't currently accurately check scoping). */
225 if (!current_function_decl
226 || DECL_ELABORATION_PROC_P (current_function_decl))
228 process_type (gnat_entity);
229 return get_gnu_tree (gnat_entity);
232 for (gnat_temp = Scope (gnat_entity);
234 gnat_temp = Scope (gnat_temp))
236 if (Is_Type (gnat_temp))
237 gnat_temp = Underlying_Type (gnat_temp);
239 if (Ekind (gnat_temp) == E_Subprogram_Body)
241 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
243 if (IN (Ekind (gnat_temp), Subprogram_Kind)
244 && Present (Protected_Body_Subprogram (gnat_temp)))
245 gnat_temp = Protected_Body_Subprogram (gnat_temp);
247 if (Ekind (gnat_temp) == E_Entry
248 || Ekind (gnat_temp) == E_Entry_Family
249 || Ekind (gnat_temp) == E_Task_Type
250 || (IN (Ekind (gnat_temp), Subprogram_Kind)
251 && present_gnu_tree (gnat_temp)
252 && (current_function_decl
253 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
255 process_type (gnat_entity);
256 return get_gnu_tree (gnat_entity);
260 /* This abort means the Itype has an incorrect scope, i.e. that its
261 scope does not correspond to the subprogram it is declared in. */
265 /* If we've already processed this entity, return what we got last time.
266 If we are defining the node, we should not have already processed it.
267 In that case, we will abort below when we try to save a new GCC tree
268 for this object. We also need to handle the case of getting a dummy
269 type when a Full_View exists. */
270 if ((!definition || (is_type && imported_p))
271 && present_gnu_tree (gnat_entity))
273 gnu_decl = get_gnu_tree (gnat_entity);
275 if (TREE_CODE (gnu_decl) == TYPE_DECL
276 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
277 && IN (kind, Incomplete_Or_Private_Kind)
278 && Present (Full_View (gnat_entity)))
281 = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0);
282 save_gnu_tree (gnat_entity, NULL_TREE, false);
283 save_gnu_tree (gnat_entity, gnu_decl, false);
289 /* If this is a numeric or enumeral type, or an access type, a nonzero
290 Esize must be specified unless it was specified by the programmer. */
291 gcc_assert (!Unknown_Esize (gnat_entity)
292 || Has_Size_Clause (gnat_entity)
293 || (!IN (kind, Numeric_Kind)
294 && !IN (kind, Enumeration_Kind)
295 && (!IN (kind, Access_Kind)
296 || kind == E_Access_Protected_Subprogram_Type
297 || kind == E_Anonymous_Access_Protected_Subprogram_Type
298 || kind == E_Access_Subtype)));
300 /* The RM size must be specified for all discrete and fixed-point types. */
301 gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind)
302 && Unknown_RM_Size (gnat_entity)));
304 /* If we get here, it means we have not yet done anything with this entity.
305 If we are not defining it, it must be a type or an entity that is defined
306 elsewhere or externally, otherwise we should have defined it already. */
307 gcc_assert (definition
308 || type_annotate_only
310 || kind == E_Discriminant
311 || kind == E_Component
313 || (kind == E_Constant && Present (Full_View (gnat_entity)))
314 || Is_Public (gnat_entity));
316 /* Get the name of the entity and set up the line number and filename of
317 the original definition for use in any decl we make. */
318 gnu_entity_name = get_entity_name (gnat_entity);
319 Sloc_to_locus (Sloc (gnat_entity), &input_location);
321 /* For cases when we are not defining (i.e., we are referencing from
322 another compilation unit) public entities, show we are at global level
323 for the purpose of computing scopes. Don't do this for components or
324 discriminants since the relevant test is whether or not the record is
327 && kind != E_Component
328 && kind != E_Discriminant
329 && Is_Public (gnat_entity)
330 && !Is_Statically_Allocated (gnat_entity))
331 force_global++, this_global = true;
333 /* Handle any attributes directly attached to the entity. */
334 if (Has_Gigi_Rep_Item (gnat_entity))
335 prepend_attributes (gnat_entity, &attr_list);
337 /* Do some common processing for types. */
340 /* Compute the equivalent type to be used in gigi. */
341 gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
343 /* Machine_Attributes on types are expected to be propagated to
344 subtypes. The corresponding Gigi_Rep_Items are only attached
345 to the first subtype though, so we handle the propagation here. */
346 if (Base_Type (gnat_entity) != gnat_entity
347 && !Is_First_Subtype (gnat_entity)
348 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
349 prepend_attributes (First_Subtype (Base_Type (gnat_entity)),
352 /* Compute a default value for the size of the type. */
353 if (Known_Esize (gnat_entity)
354 && UI_Is_In_Int_Range (Esize (gnat_entity)))
356 unsigned int max_esize;
357 esize = UI_To_Int (Esize (gnat_entity));
359 if (IN (kind, Float_Kind))
360 max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
361 else if (IN (kind, Access_Kind))
362 max_esize = POINTER_SIZE * 2;
364 max_esize = LONG_LONG_TYPE_SIZE;
366 esize = MIN (esize, max_esize);
369 esize = LONG_LONG_TYPE_SIZE;
375 /* If this is a use of a deferred constant without address clause,
376 get its full definition. */
378 && No (Address_Clause (gnat_entity))
379 && Present (Full_View (gnat_entity)))
382 = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
387 /* If we have an external constant that we are not defining, get the
388 expression that is was defined to represent. We may throw that
389 expression away later if it is not a constant. Do not retrieve the
390 expression if it is an aggregate or allocator, because in complex
391 instantiation contexts it may not be expanded */
393 && Present (Expression (Declaration_Node (gnat_entity)))
394 && !No_Initialization (Declaration_Node (gnat_entity))
395 && (Nkind (Expression (Declaration_Node (gnat_entity)))
397 && (Nkind (Expression (Declaration_Node (gnat_entity)))
399 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
401 /* Ignore deferred constant definitions without address clause since
402 they are processed fully in the front-end. If No_Initialization
403 is set, this is not a deferred constant but a constant whose value
404 is built manually. And constants that are renamings are handled
408 && No (Address_Clause (gnat_entity))
409 && !No_Initialization (Declaration_Node (gnat_entity))
410 && No (Renamed_Object (gnat_entity)))
412 gnu_decl = error_mark_node;
417 /* Ignore constant definitions already marked with the error node. See
418 the N_Object_Declaration case of gnat_to_gnu for the rationale. */
421 && present_gnu_tree (gnat_entity)
422 && get_gnu_tree (gnat_entity) == error_mark_node)
424 maybe_present = true;
431 /* We used to special case VMS exceptions here to directly map them to
432 their associated condition code. Since this code had to be masked
433 dynamically to strip off the severity bits, this caused trouble in
434 the GCC/ZCX case because the "type" pointers we store in the tables
435 have to be static. We now don't special case here anymore, and let
436 the regular processing take place, which leaves us with a regular
437 exception data object for VMS exceptions too. The condition code
438 mapping is taken care of by the front end and the bitmasking by the
445 /* The GNAT record where the component was defined. */
446 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
448 /* If the variable is an inherited record component (in the case of
449 extended record types), just return the inherited entity, which
450 must be a FIELD_DECL. Likewise for discriminants.
451 For discriminants of untagged records which have explicit
452 stored discriminants, return the entity for the corresponding
453 stored discriminant. Also use Original_Record_Component
454 if the record has a private extension. */
455 if (Present (Original_Record_Component (gnat_entity))
456 && Original_Record_Component (gnat_entity) != gnat_entity)
459 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
460 gnu_expr, definition);
465 /* If the enclosing record has explicit stored discriminants,
466 then it is an untagged record. If the Corresponding_Discriminant
467 is not empty then this must be a renamed discriminant and its
468 Original_Record_Component must point to the corresponding explicit
469 stored discriminant (i.e. we should have taken the previous
471 else if (Present (Corresponding_Discriminant (gnat_entity))
472 && Is_Tagged_Type (gnat_record))
474 /* A tagged record has no explicit stored discriminants. */
475 gcc_assert (First_Discriminant (gnat_record)
476 == First_Stored_Discriminant (gnat_record));
478 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
479 gnu_expr, definition);
484 else if (Present (CR_Discriminant (gnat_entity))
485 && type_annotate_only)
487 gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
488 gnu_expr, definition);
493 /* If the enclosing record has explicit stored discriminants, then
494 it is an untagged record. If the Corresponding_Discriminant
495 is not empty then this must be a renamed discriminant and its
496 Original_Record_Component must point to the corresponding explicit
497 stored discriminant (i.e. we should have taken the first
499 else if (Present (Corresponding_Discriminant (gnat_entity))
500 && (First_Discriminant (gnat_record)
501 != First_Stored_Discriminant (gnat_record)))
504 /* Otherwise, if we are not defining this and we have no GCC type
505 for the containing record, make one for it. Then we should
506 have made our own equivalent. */
507 else if (!definition && !present_gnu_tree (gnat_record))
509 /* ??? If this is in a record whose scope is a protected
510 type and we have an Original_Record_Component, use it.
511 This is a workaround for major problems in protected type
513 Entity_Id Scop = Scope (Scope (gnat_entity));
514 if ((Is_Protected_Type (Scop)
515 || (Is_Private_Type (Scop)
516 && Present (Full_View (Scop))
517 && Is_Protected_Type (Full_View (Scop))))
518 && Present (Original_Record_Component (gnat_entity)))
521 = gnat_to_gnu_entity (Original_Record_Component
528 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
529 gnu_decl = get_gnu_tree (gnat_entity);
535 /* Here we have no GCC type and this is a reference rather than a
536 definition. This should never happen. Most likely the cause is
537 reference before declaration in the gnat tree for gnat_entity. */
541 case E_Loop_Parameter:
542 case E_Out_Parameter:
545 /* Simple variables, loop variables, Out parameters, and exceptions. */
548 bool used_by_ref = false;
550 = ((kind == E_Constant || kind == E_Variable)
551 && Is_True_Constant (gnat_entity)
552 && !Treat_As_Volatile (gnat_entity)
553 && (((Nkind (Declaration_Node (gnat_entity))
554 == N_Object_Declaration)
555 && Present (Expression (Declaration_Node (gnat_entity))))
556 || Present (Renamed_Object (gnat_entity))));
557 bool inner_const_flag = const_flag;
558 bool static_p = Is_Statically_Allocated (gnat_entity);
559 bool mutable_p = false;
560 tree gnu_ext_name = NULL_TREE;
561 tree renamed_obj = NULL_TREE;
562 tree gnu_object_size;
564 if (Present (Renamed_Object (gnat_entity)) && !definition)
566 if (kind == E_Exception)
567 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
570 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
573 /* Get the type after elaborating the renamed object. */
574 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
576 /* For a debug renaming declaration, build a pure debug entity. */
577 if (Present (Debug_Renaming_Link (gnat_entity)))
580 gnu_decl = build_decl (VAR_DECL, gnu_entity_name, gnu_type);
581 /* The (MEM (CONST (0))) pattern is prescribed by STABS. */
582 if (global_bindings_p ())
583 addr = gen_rtx_CONST (VOIDmode, const0_rtx);
585 addr = stack_pointer_rtx;
586 SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
587 gnat_pushdecl (gnu_decl, gnat_entity);
591 /* If this is a loop variable, its type should be the base type.
592 This is because the code for processing a loop determines whether
593 a normal loop end test can be done by comparing the bounds of the
594 loop against those of the base type, which is presumed to be the
595 size used for computation. But this is not correct when the size
596 of the subtype is smaller than the type. */
597 if (kind == E_Loop_Parameter)
598 gnu_type = get_base_type (gnu_type);
600 /* Reject non-renamed objects whose types are unconstrained arrays or
601 any object whose type is a dummy type or VOID_TYPE. */
603 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
604 && No (Renamed_Object (gnat_entity)))
605 || TYPE_IS_DUMMY_P (gnu_type)
606 || TREE_CODE (gnu_type) == VOID_TYPE)
608 gcc_assert (type_annotate_only);
611 return error_mark_node;
614 /* If an alignment is specified, use it if valid. Note that
615 exceptions are objects but don't have alignments. We must do this
616 before we validate the size, since the alignment can affect the
618 if (kind != E_Exception && Known_Alignment (gnat_entity))
620 gcc_assert (Present (Alignment (gnat_entity)));
621 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
622 TYPE_ALIGN (gnu_type));
623 gnu_type = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
624 "PAD", false, definition, true);
627 /* If we are defining the object, see if it has a Size value and
628 validate it if so. If we are not defining the object and a Size
629 clause applies, simply retrieve the value. We don't want to ignore
630 the clause and it is expected to have been validated already. Then
631 get the new type, if any. */
633 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
634 gnat_entity, VAR_DECL, false,
635 Has_Size_Clause (gnat_entity));
636 else if (Has_Size_Clause (gnat_entity))
637 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
642 = make_type_from_size (gnu_type, gnu_size,
643 Has_Biased_Representation (gnat_entity));
645 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
646 gnu_size = NULL_TREE;
649 /* If this object has self-referential size, it must be a record with
650 a default value. We are supposed to allocate an object of the
651 maximum size in this case unless it is a constant with an
652 initializing expression, in which case we can get the size from
653 that. Note that the resulting size may still be a variable, so
654 this may end up with an indirect allocation. */
655 if (No (Renamed_Object (gnat_entity))
656 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
658 if (gnu_expr && kind == E_Constant)
660 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
661 if (CONTAINS_PLACEHOLDER_P (size))
663 /* If the initializing expression is itself a constant,
664 despite having a nominal type with self-referential
665 size, we can get the size directly from it. */
666 if (TREE_CODE (gnu_expr) == COMPONENT_REF
667 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
670 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
671 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
672 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
673 || DECL_READONLY_ONCE_ELAB
674 (TREE_OPERAND (gnu_expr, 0))))
675 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
678 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
683 /* We may have no GNU_EXPR because No_Initialization is
684 set even though there's an Expression. */
685 else if (kind == E_Constant
686 && (Nkind (Declaration_Node (gnat_entity))
687 == N_Object_Declaration)
688 && Present (Expression (Declaration_Node (gnat_entity))))
690 = TYPE_SIZE (gnat_to_gnu_type
692 (Expression (Declaration_Node (gnat_entity)))));
695 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
700 /* If the size is zero bytes, make it one byte since some linkers have
701 trouble with zero-sized objects. If the object will have a
702 template, that will make it nonzero so don't bother. Also avoid
703 doing that for an object renaming or an object with an address
704 clause, as we would lose useful information on the view size
705 (e.g. for null array slices) and we are not allocating the object
708 && integer_zerop (gnu_size)
709 && !TREE_OVERFLOW (gnu_size))
710 || (TYPE_SIZE (gnu_type)
711 && integer_zerop (TYPE_SIZE (gnu_type))
712 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
713 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
714 || !Is_Array_Type (Etype (gnat_entity)))
715 && No (Renamed_Object (gnat_entity))
716 && No (Address_Clause (gnat_entity)))
717 gnu_size = bitsize_unit_node;
719 /* If this is an object with no specified size and alignment, and
720 if either it is atomic or we are not optimizing alignment for
721 space and it is composite and not an exception, an Out parameter
722 or a reference to another object, and the size of its type is a
723 constant, set the alignment to the smallest one which is not
724 smaller than the size, with an appropriate cap. */
725 if (!gnu_size && align == 0
726 && (Is_Atomic (gnat_entity)
727 || (!Optimize_Alignment_Space (gnat_entity)
728 && kind != E_Exception
729 && kind != E_Out_Parameter
730 && Is_Composite_Type (Etype (gnat_entity))
731 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
733 && No (Renamed_Object (gnat_entity))
734 && No (Address_Clause (gnat_entity))))
735 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
737 /* No point in jumping through all the hoops needed in order
738 to support BIGGEST_ALIGNMENT if we don't really have to.
739 So we cap to the smallest alignment that corresponds to
740 a known efficient memory access pattern of the target. */
741 unsigned int align_cap = Is_Atomic (gnat_entity)
743 : get_mode_alignment (ptr_mode);
745 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
746 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
749 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
751 /* But make sure not to under-align the object. */
752 if (align <= TYPE_ALIGN (gnu_type))
755 /* And honor the minimum valid atomic alignment, if any. */
756 #ifdef MINIMUM_ATOMIC_ALIGNMENT
757 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
758 align = MINIMUM_ATOMIC_ALIGNMENT;
762 /* If the object is set to have atomic components, find the component
763 type and validate it.
765 ??? Note that we ignore Has_Volatile_Components on objects; it's
766 not at all clear what to do in that case. */
768 if (Has_Atomic_Components (gnat_entity))
770 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
771 ? TREE_TYPE (gnu_type) : gnu_type);
773 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
774 && TYPE_MULTI_ARRAY_P (gnu_inner))
775 gnu_inner = TREE_TYPE (gnu_inner);
777 check_ok_for_atomic (gnu_inner, gnat_entity, true);
780 /* Now check if the type of the object allows atomic access. Note
781 that we must test the type, even if this object has size and
782 alignment to allow such access, because we will be going
783 inside the padded record to assign to the object. We could fix
784 this by always copying via an intermediate value, but it's not
785 clear it's worth the effort. */
786 if (Is_Atomic (gnat_entity))
787 check_ok_for_atomic (gnu_type, gnat_entity, false);
789 /* If this is an aliased object with an unconstrained nominal subtype,
790 make a type that includes the template. */
791 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
792 && Is_Array_Type (Etype (gnat_entity))
793 && !type_annotate_only)
796 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
799 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
800 concat_name (gnu_entity_name,
804 #ifdef MINIMUM_ATOMIC_ALIGNMENT
805 /* If the size is a constant and no alignment is specified, force
806 the alignment to be the minimum valid atomic alignment. The
807 restriction on constant size avoids problems with variable-size
808 temporaries; if the size is variable, there's no issue with
809 atomic access. Also don't do this for a constant, since it isn't
810 necessary and can interfere with constant replacement. Finally,
811 do not do it for Out parameters since that creates an
812 size inconsistency with In parameters. */
813 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
814 && !FLOAT_TYPE_P (gnu_type)
815 && !const_flag && No (Renamed_Object (gnat_entity))
816 && !imported_p && No (Address_Clause (gnat_entity))
817 && kind != E_Out_Parameter
818 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
819 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
820 align = MINIMUM_ATOMIC_ALIGNMENT;
823 /* Make a new type with the desired size and alignment, if needed.
824 But do not take into account alignment promotions to compute the
825 size of the object. */
826 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
827 if (gnu_size || align > 0)
828 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
829 "PAD", false, definition,
830 gnu_size ? true : false);
832 /* If this is a renaming, avoid as much as possible to create a new
833 object. However, in several cases, creating it is required.
834 This processing needs to be applied to the raw expression so
835 as to make it more likely to rename the underlying object. */
836 if (Present (Renamed_Object (gnat_entity)))
838 bool create_normal_object = false;
840 /* If the renamed object had padding, strip off the reference
841 to the inner object and reset our type. */
842 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
843 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
845 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
846 /* Strip useless conversions around the object. */
847 || (TREE_CODE (gnu_expr) == NOP_EXPR
848 && gnat_types_compatible_p
849 (TREE_TYPE (gnu_expr),
850 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
852 gnu_expr = TREE_OPERAND (gnu_expr, 0);
853 gnu_type = TREE_TYPE (gnu_expr);
856 /* Case 1: If this is a constant renaming stemming from a function
857 call, treat it as a normal object whose initial value is what
858 is being renamed. RM 3.3 says that the result of evaluating a
859 function call is a constant object. As a consequence, it can
860 be the inner object of a constant renaming. In this case, the
861 renaming must be fully instantiated, i.e. it cannot be a mere
862 reference to (part of) an existing object. */
865 tree inner_object = gnu_expr;
866 while (handled_component_p (inner_object))
867 inner_object = TREE_OPERAND (inner_object, 0);
868 if (TREE_CODE (inner_object) == CALL_EXPR)
869 create_normal_object = true;
872 /* Otherwise, see if we can proceed with a stabilized version of
873 the renamed entity or if we need to make a new object. */
874 if (!create_normal_object)
876 tree maybe_stable_expr = NULL_TREE;
879 /* Case 2: If the renaming entity need not be materialized and
880 the renamed expression is something we can stabilize, use
881 that for the renaming. At the global level, we can only do
882 this if we know no SAVE_EXPRs need be made, because the
883 expression we return might be used in arbitrary conditional
884 branches so we must force the SAVE_EXPRs evaluation
885 immediately and this requires a function context. */
886 if (!Materialize_Entity (gnat_entity)
887 && (!global_bindings_p ()
888 || (staticp (gnu_expr)
889 && !TREE_SIDE_EFFECTS (gnu_expr))))
892 = maybe_stabilize_reference (gnu_expr, true, &stable);
896 gnu_decl = maybe_stable_expr;
897 /* ??? No DECL_EXPR is created so we need to mark
898 the expression manually lest it is shared. */
899 if (global_bindings_p ())
900 mark_visited (&gnu_decl);
901 save_gnu_tree (gnat_entity, gnu_decl, true);
906 /* The stabilization failed. Keep maybe_stable_expr
907 untouched here to let the pointer case below know
908 about that failure. */
911 /* Case 3: If this is a constant renaming and creating a
912 new object is allowed and cheap, treat it as a normal
913 object whose initial value is what is being renamed. */
915 && !Is_Composite_Type
916 (Underlying_Type (Etype (gnat_entity))))
919 /* Case 4: Make this into a constant pointer to the object we
920 are to rename and attach the object to the pointer if it is
921 something we can stabilize.
923 From the proper scope, attached objects will be referenced
924 directly instead of indirectly via the pointer to avoid
925 subtle aliasing problems with non-addressable entities.
926 They have to be stable because we must not evaluate the
927 variables in the expression every time the renaming is used.
928 The pointer is called a "renaming" pointer in this case.
930 In the rare cases where we cannot stabilize the renamed
931 object, we just make a "bare" pointer, and the renamed
932 entity is always accessed indirectly through it. */
935 gnu_type = build_reference_type (gnu_type);
936 inner_const_flag = TREE_READONLY (gnu_expr);
939 /* If the previous attempt at stabilizing failed, there
940 is no point in trying again and we reuse the result
941 without attaching it to the pointer. In this case it
942 will only be used as the initializing expression of
943 the pointer and thus needs no special treatment with
944 regard to multiple evaluations. */
945 if (maybe_stable_expr)
948 /* Otherwise, try to stabilize and attach the expression
949 to the pointer if the stabilization succeeds.
951 Note that this might introduce SAVE_EXPRs and we don't
952 check whether we're at the global level or not. This
953 is fine since we are building a pointer initializer and
954 neither the pointer nor the initializing expression can
955 be accessed before the pointer elaboration has taken
956 place in a correct program.
958 These SAVE_EXPRs will be evaluated at the right place
959 by either the evaluation of the initializer for the
960 non-global case or the elaboration code for the global
961 case, and will be attached to the elaboration procedure
962 in the latter case. */
966 = maybe_stabilize_reference (gnu_expr, true, &stable);
969 renamed_obj = maybe_stable_expr;
971 /* Attaching is actually performed downstream, as soon
972 as we have a VAR_DECL for the pointer we make. */
976 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
978 gnu_size = NULL_TREE;
984 /* Make a volatile version of this object's type if we are to make
985 the object volatile. We also interpret 13.3(19) conservatively
986 and disallow any optimizations for such a non-constant object. */
987 if ((Treat_As_Volatile (gnat_entity)
989 && (Is_Exported (gnat_entity)
990 || Is_Imported (gnat_entity)
991 || Present (Address_Clause (gnat_entity)))))
992 && !TYPE_VOLATILE (gnu_type))
993 gnu_type = build_qualified_type (gnu_type,
994 (TYPE_QUALS (gnu_type)
995 | TYPE_QUAL_VOLATILE));
997 /* If we are defining an aliased object whose nominal subtype is
998 unconstrained, the object is a record that contains both the
999 template and the object. If there is an initializer, it will
1000 have already been converted to the right type, but we need to
1001 create the template if there is no initializer. */
1004 && TREE_CODE (gnu_type) == RECORD_TYPE
1005 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1006 /* Beware that padding might have been introduced
1007 via maybe_pad_type above. */
1008 || (TYPE_IS_PADDING_P (gnu_type)
1009 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1011 && TYPE_CONTAINS_TEMPLATE_P
1012 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1015 = TYPE_IS_PADDING_P (gnu_type)
1016 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1017 : TYPE_FIELDS (gnu_type);
1020 = gnat_build_constructor
1024 build_template (TREE_TYPE (template_field),
1025 TREE_TYPE (TREE_CHAIN (template_field)),
1030 /* Convert the expression to the type of the object except in the
1031 case where the object's type is unconstrained or the object's type
1032 is a padded record whose field is of self-referential size. In
1033 the former case, converting will generate unnecessary evaluations
1034 of the CONSTRUCTOR to compute the size and in the latter case, we
1035 want to only copy the actual data. */
1037 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1038 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1039 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1040 && TYPE_IS_PADDING_P (gnu_type)
1041 && (CONTAINS_PLACEHOLDER_P
1042 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1043 gnu_expr = convert (gnu_type, gnu_expr);
1045 /* If this is a pointer and it does not have an initializing
1046 expression, initialize it to NULL, unless the object is
1049 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
1050 && !Is_Imported (gnat_entity) && !gnu_expr)
1051 gnu_expr = integer_zero_node;
1053 /* If we are defining the object and it has an Address clause, we must
1054 either get the address expression from the saved GCC tree for the
1055 object if it has a Freeze node, or elaborate the address expression
1056 here since the front-end has guaranteed that the elaboration has no
1057 effects in this case. */
1058 if (definition && Present (Address_Clause (gnat_entity)))
1061 = present_gnu_tree (gnat_entity)
1062 ? get_gnu_tree (gnat_entity)
1063 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1065 save_gnu_tree (gnat_entity, NULL_TREE, false);
1067 /* Ignore the size. It's either meaningless or was handled
1069 gnu_size = NULL_TREE;
1070 /* Convert the type of the object to a reference type that can
1071 alias everything as per 13.3(19). */
1073 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1074 gnu_address = convert (gnu_type, gnu_address);
1076 const_flag = !Is_Public (gnat_entity)
1077 || compile_time_known_address_p (Expression (Address_Clause
1080 /* If this is a deferred constant, the initializer is attached to
1082 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1085 (Expression (Declaration_Node (Full_View (gnat_entity))));
1087 /* If we don't have an initializing expression for the underlying
1088 variable, the initializing expression for the pointer is the
1089 specified address. Otherwise, we have to make a COMPOUND_EXPR
1090 to assign both the address and the initial value. */
1092 gnu_expr = gnu_address;
1095 = build2 (COMPOUND_EXPR, gnu_type,
1097 (MODIFY_EXPR, NULL_TREE,
1098 build_unary_op (INDIRECT_REF, NULL_TREE,
1104 /* If it has an address clause and we are not defining it, mark it
1105 as an indirect object. Likewise for Stdcall objects that are
1107 if ((!definition && Present (Address_Clause (gnat_entity)))
1108 || (Is_Imported (gnat_entity)
1109 && Has_Stdcall_Convention (gnat_entity)))
1111 /* Convert the type of the object to a reference type that can
1112 alias everything as per 13.3(19). */
1114 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1115 gnu_size = NULL_TREE;
1117 /* No point in taking the address of an initializing expression
1118 that isn't going to be used. */
1119 gnu_expr = NULL_TREE;
1121 /* If it has an address clause whose value is known at compile
1122 time, make the object a CONST_DECL. This will avoid a
1123 useless dereference. */
1124 if (Present (Address_Clause (gnat_entity)))
1126 Node_Id gnat_address
1127 = Expression (Address_Clause (gnat_entity));
1129 if (compile_time_known_address_p (gnat_address))
1131 gnu_expr = gnat_to_gnu (gnat_address);
1139 /* If we are at top level and this object is of variable size,
1140 make the actual type a hidden pointer to the real type and
1141 make the initializer be a memory allocation and initialization.
1142 Likewise for objects we aren't defining (presumed to be
1143 external references from other packages), but there we do
1144 not set up an initialization.
1146 If the object's size overflows, make an allocator too, so that
1147 Storage_Error gets raised. Note that we will never free
1148 such memory, so we presume it never will get allocated. */
1150 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1151 global_bindings_p () || !definition
1154 && ! allocatable_size_p (gnu_size,
1155 global_bindings_p () || !definition
1158 gnu_type = build_reference_type (gnu_type);
1159 gnu_size = NULL_TREE;
1163 /* In case this was a aliased object whose nominal subtype is
1164 unconstrained, the pointer above will be a thin pointer and
1165 build_allocator will automatically make the template.
1167 If we have a template initializer only (that we made above),
1168 pretend there is none and rely on what build_allocator creates
1169 again anyway. Otherwise (if we have a full initializer), get
1170 the data part and feed that to build_allocator.
1172 If we are elaborating a mutable object, tell build_allocator to
1173 ignore a possibly simpler size from the initializer, if any, as
1174 we must allocate the maximum possible size in this case. */
1178 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1180 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1181 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1184 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1186 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1187 && 1 == VEC_length (constructor_elt,
1188 CONSTRUCTOR_ELTS (gnu_expr)))
1192 = build_component_ref
1193 (gnu_expr, NULL_TREE,
1194 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1198 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1199 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1200 && !Is_Imported (gnat_entity))
1201 post_error ("?Storage_Error will be raised at run-time!",
1204 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1205 0, 0, gnat_entity, mutable_p);
1209 gnu_expr = NULL_TREE;
1214 /* If this object would go into the stack and has an alignment larger
1215 than the largest stack alignment the back-end can honor, resort to
1216 a variable of "aligning type". */
1217 if (!global_bindings_p () && !static_p && definition
1218 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1220 /* Create the new variable. No need for extra room before the
1221 aligned field as this is in automatic storage. */
1223 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1224 TYPE_SIZE_UNIT (gnu_type),
1225 BIGGEST_ALIGNMENT, 0);
1227 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1228 NULL_TREE, gnu_new_type, NULL_TREE, false,
1229 false, false, false, NULL, gnat_entity);
1231 /* Initialize the aligned field if we have an initializer. */
1234 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1236 (gnu_new_var, NULL_TREE,
1237 TYPE_FIELDS (gnu_new_type), false),
1241 /* And setup this entity as a reference to the aligned field. */
1242 gnu_type = build_reference_type (gnu_type);
1245 (ADDR_EXPR, gnu_type,
1246 build_component_ref (gnu_new_var, NULL_TREE,
1247 TYPE_FIELDS (gnu_new_type), false));
1249 gnu_size = NULL_TREE;
1255 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1256 | TYPE_QUAL_CONST));
1258 /* Convert the expression to the type of the object except in the
1259 case where the object's type is unconstrained or the object's type
1260 is a padded record whose field is of self-referential size. In
1261 the former case, converting will generate unnecessary evaluations
1262 of the CONSTRUCTOR to compute the size and in the latter case, we
1263 want to only copy the actual data. */
1265 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1266 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1267 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1268 && TYPE_IS_PADDING_P (gnu_type)
1269 && (CONTAINS_PLACEHOLDER_P
1270 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1271 gnu_expr = convert (gnu_type, gnu_expr);
1273 /* If this name is external or there was a name specified, use it,
1274 unless this is a VMS exception object since this would conflict
1275 with the symbol we need to export in addition. Don't use the
1276 Interface_Name if there is an address clause (see CD30005). */
1277 if (!Is_VMS_Exception (gnat_entity)
1278 && ((Present (Interface_Name (gnat_entity))
1279 && No (Address_Clause (gnat_entity)))
1280 || (Is_Public (gnat_entity)
1281 && (!Is_Imported (gnat_entity)
1282 || Is_Exported (gnat_entity)))))
1283 gnu_ext_name = create_concat_name (gnat_entity, NULL);
1285 /* If this is constant initialized to a static constant and the
1286 object has an aggregate type, force it to be statically
1287 allocated. This will avoid an initialization copy. */
1288 if (!static_p && const_flag
1289 && gnu_expr && TREE_CONSTANT (gnu_expr)
1290 && AGGREGATE_TYPE_P (gnu_type)
1291 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1292 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1293 && TYPE_IS_PADDING_P (gnu_type)
1294 && !host_integerp (TYPE_SIZE_UNIT
1295 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1298 gnu_decl = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1299 gnu_expr, const_flag,
1300 Is_Public (gnat_entity),
1301 imported_p || !definition,
1302 static_p, attr_list, gnat_entity);
1303 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1304 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1305 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1307 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1308 if (global_bindings_p ())
1310 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1311 record_global_renaming_pointer (gnu_decl);
1315 if (definition && DECL_SIZE_UNIT (gnu_decl)
1316 && get_block_jmpbuf_decl ()
1317 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1318 || (flag_stack_check == GENERIC_STACK_CHECK
1319 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1320 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1321 add_stmt_with_node (build_call_1_expr
1322 (update_setjmp_buf_decl,
1323 build_unary_op (ADDR_EXPR, NULL_TREE,
1324 get_block_jmpbuf_decl ())),
1327 /* If we are defining an Out parameter and we're not optimizing,
1328 create a fake PARM_DECL for debugging purposes and make it
1329 point to the VAR_DECL. Suppress debug info for the latter
1330 but make sure it will still live on the stack so it can be
1331 accessed from within the debugger through the PARM_DECL. */
1332 if (kind == E_Out_Parameter && definition && !optimize)
1334 tree param = create_param_decl (gnu_entity_name, gnu_type, false);
1335 gnat_pushdecl (param, gnat_entity);
1336 SET_DECL_VALUE_EXPR (param, gnu_decl);
1337 DECL_HAS_VALUE_EXPR_P (param) = 1;
1339 debug_info_p = false;
1341 DECL_IGNORED_P (param) = 1;
1342 TREE_ADDRESSABLE (gnu_decl) = 1;
1345 /* If this is a public constant or we're not optimizing and we're not
1346 making a VAR_DECL for it, make one just for export or debugger use.
1347 Likewise if the address is taken or if either the object or type is
1348 aliased. Make an external declaration for a reference, unless this
1349 is a Standard entity since there no real symbol at the object level
1351 if (TREE_CODE (gnu_decl) == CONST_DECL
1352 && (definition || Sloc (gnat_entity) > Standard_Location)
1353 && ((Is_Public (gnat_entity) && No (Address_Clause (gnat_entity)))
1355 || Address_Taken (gnat_entity)
1356 || Is_Aliased (gnat_entity)
1357 || Is_Aliased (Etype (gnat_entity))))
1360 = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1361 gnu_expr, true, Is_Public (gnat_entity),
1362 !definition, static_p, NULL,
1365 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1367 /* As debugging information will be generated for the variable,
1368 do not generate information for the constant. */
1369 DECL_IGNORED_P (gnu_decl) = 1;
1372 /* If this is declared in a block that contains a block with an
1373 exception handler, we must force this variable in memory to
1374 suppress an invalid optimization. */
1375 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1376 && Exception_Mechanism != Back_End_Exceptions)
1377 TREE_ADDRESSABLE (gnu_decl) = 1;
1379 gnu_type = TREE_TYPE (gnu_decl);
1381 /* Back-annotate Alignment and Esize of the object if not already
1382 known, except for when the object is actually a pointer to the
1383 real object, since alignment and size of a pointer don't have
1384 anything to do with those of the designated object. Note that
1385 we pick the values of the type, not those of the object, to
1386 shield ourselves from low-level platform-dependent adjustments
1387 like alignment promotion. This is both consistent with all the
1388 treatment above, where alignment and size are set on the type of
1389 the object and not on the object directly, and makes it possible
1390 to support confirming representation clauses in all cases. */
1392 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1393 Set_Alignment (gnat_entity,
1394 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
1396 if (!used_by_ref && Unknown_Esize (gnat_entity))
1398 if (TREE_CODE (gnu_type) == RECORD_TYPE
1399 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
1401 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
1403 Set_Esize (gnat_entity, annotate_value (gnu_object_size));
1409 /* Return a TYPE_DECL for "void" that we previously made. */
1410 gnu_decl = TYPE_NAME (void_type_node);
1413 case E_Enumeration_Type:
1414 /* A special case: for the types Character and Wide_Character in
1415 Standard, we do not list all the literals. So if the literals
1416 are not specified, make this an unsigned type. */
1417 if (No (First_Literal (gnat_entity)))
1419 gnu_type = make_unsigned_type (esize);
1420 TYPE_NAME (gnu_type) = gnu_entity_name;
1422 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1423 This is needed by the DWARF-2 back-end to distinguish between
1424 unsigned integer types and character types. */
1425 TYPE_STRING_FLAG (gnu_type) = 1;
1429 /* Normal case of non-character type or non-Standard character type. */
1431 /* Here we have a list of enumeral constants in First_Literal.
1432 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1433 the list to be placed into TYPE_FIELDS. Each node in the list
1434 is a TREE_LIST whose TREE_VALUE is the literal name and whose
1435 TREE_PURPOSE is the value of the literal. */
1437 Entity_Id gnat_literal;
1438 tree gnu_literal_list = NULL_TREE;
1440 if (Is_Unsigned_Type (gnat_entity))
1441 gnu_type = make_unsigned_type (esize);
1443 gnu_type = make_signed_type (esize);
1445 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1447 for (gnat_literal = First_Literal (gnat_entity);
1448 Present (gnat_literal);
1449 gnat_literal = Next_Literal (gnat_literal))
1451 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1454 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1455 gnu_type, gnu_value, true, false, false,
1456 false, NULL, gnat_literal);
1458 save_gnu_tree (gnat_literal, gnu_literal, false);
1459 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1460 gnu_value, gnu_literal_list);
1463 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1465 /* Note that the bounds are updated at the end of this function
1466 to avoid an infinite recursion since they refer to the type. */
1470 case E_Signed_Integer_Type:
1471 case E_Ordinary_Fixed_Point_Type:
1472 case E_Decimal_Fixed_Point_Type:
1473 /* For integer types, just make a signed type the appropriate number
1475 gnu_type = make_signed_type (esize);
1478 case E_Modular_Integer_Type:
1480 /* For modular types, make the unsigned type of the proper number
1481 of bits and then set up the modulus, if required. */
1482 tree gnu_modulus, gnu_high = NULL_TREE;
1484 /* Packed array types are supposed to be subtypes only. */
1485 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1487 gnu_type = make_unsigned_type (esize);
1489 /* Get the modulus in this type. If it overflows, assume it is because
1490 it is equal to 2**Esize. Note that there is no overflow checking
1491 done on unsigned type, so we detect the overflow by looking for
1492 a modulus of zero, which is otherwise invalid. */
1493 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1495 if (!integer_zerop (gnu_modulus))
1497 TYPE_MODULAR_P (gnu_type) = 1;
1498 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1499 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1500 convert (gnu_type, integer_one_node));
1503 /* If the upper bound is not maximal, make an extra subtype. */
1505 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1507 tree gnu_subtype = make_unsigned_type (esize);
1508 TYPE_MAX_VALUE (gnu_subtype) = gnu_high;
1509 TREE_TYPE (gnu_subtype) = gnu_type;
1510 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1511 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1512 gnu_type = gnu_subtype;
1517 case E_Signed_Integer_Subtype:
1518 case E_Enumeration_Subtype:
1519 case E_Modular_Integer_Subtype:
1520 case E_Ordinary_Fixed_Point_Subtype:
1521 case E_Decimal_Fixed_Point_Subtype:
1523 /* For integral subtypes, we make a new INTEGER_TYPE. Note hat we do
1524 not want to call build_range_type since we would like each subtype
1525 node to be distinct. This will be important when memory aliasing
1528 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1529 this fact is used by the arithmetic conversion functions.
1531 We elaborate the Ancestor_Subtype if it is not in the current unit
1532 and one of our bounds is non-static. We do this to ensure consistent
1533 naming in the case where several subtypes share the same bounds, by
1534 elaborating the first such subtype first, thus using its name. */
1537 && Present (Ancestor_Subtype (gnat_entity))
1538 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1539 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1540 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1541 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1543 gnu_type = make_node (INTEGER_TYPE);
1544 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1546 /* Set the precision to the Esize except for bit-packed arrays and
1547 subtypes of Standard.Boolean. */
1548 if (Is_Packed_Array_Type (gnat_entity)
1549 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1550 esize = UI_To_Int (RM_Size (gnat_entity));
1551 else if (TREE_CODE (TREE_TYPE (gnu_type)) == BOOLEAN_TYPE)
1554 TYPE_PRECISION (gnu_type) = esize;
1556 TYPE_MIN_VALUE (gnu_type)
1557 = convert (TREE_TYPE (gnu_type),
1558 elaborate_expression (Type_Low_Bound (gnat_entity),
1560 get_identifier ("L"), definition, 1,
1561 Needs_Debug_Info (gnat_entity)));
1563 TYPE_MAX_VALUE (gnu_type)
1564 = convert (TREE_TYPE (gnu_type),
1565 elaborate_expression (Type_High_Bound (gnat_entity),
1567 get_identifier ("U"), definition, 1,
1568 Needs_Debug_Info (gnat_entity)));
1570 /* One of the above calls might have caused us to be elaborated,
1571 so don't blow up if so. */
1572 if (present_gnu_tree (gnat_entity))
1574 maybe_present = true;
1578 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1579 = Has_Biased_Representation (gnat_entity);
1581 /* This should be an unsigned type if the lower bound is constant
1582 and non-negative or if the base type is unsigned; a signed type
1584 TYPE_UNSIGNED (gnu_type)
1585 = (TYPE_UNSIGNED (TREE_TYPE (gnu_type))
1586 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
1587 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
1588 || TYPE_BIASED_REPRESENTATION_P (gnu_type)
1589 || Is_Unsigned_Type (gnat_entity));
1591 layout_type (gnu_type);
1593 /* Inherit our alias set from what we're a subtype of. Subtypes
1594 are not different types and a pointer can designate any instance
1595 within a subtype hierarchy. */
1596 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1598 /* If the type we are dealing with represents a bit-packed array,
1599 we need to have the bits left justified on big-endian targets
1600 and right justified on little-endian targets. We also need to
1601 ensure that when the value is read (e.g. for comparison of two
1602 such values), we only get the good bits, since the unused bits
1603 are uninitialized. Both goals are accomplished by wrapping up
1604 the modular type in an enclosing record type. */
1605 if (Is_Packed_Array_Type (gnat_entity)
1606 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1608 tree gnu_field_type, gnu_field;
1610 /* Set the RM size before wrapping up the type. */
1611 TYPE_RM_SIZE (gnu_type)
1612 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1613 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1614 gnu_field_type = gnu_type;
1616 gnu_type = make_node (RECORD_TYPE);
1617 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1619 /* Propagate the alignment of the modular type to the record.
1620 This means that bit-packed arrays have "ceil" alignment for
1621 their size, which may seem counter-intuitive but makes it
1622 possible to easily overlay them on modular types. */
1623 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1624 TYPE_PACKED (gnu_type) = 1;
1626 /* Create a stripped-down declaration of the original type, mainly
1628 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1629 debug_info_p, gnat_entity);
1631 /* Don't notify the field as "addressable", since we won't be taking
1632 it's address and it would prevent create_field_decl from making a
1634 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1635 gnu_field_type, gnu_type, 1, 0, 0, 0);
1637 finish_record_type (gnu_type, gnu_field, 0, false);
1638 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1640 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1643 /* If the type we are dealing with has got a smaller alignment than the
1644 natural one, we need to wrap it up in a record type and under-align
1645 the latter. We reuse the padding machinery for this purpose. */
1646 else if (Known_Alignment (gnat_entity)
1647 && UI_Is_In_Int_Range (Alignment (gnat_entity))
1648 && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
1649 && align < TYPE_ALIGN (gnu_type))
1651 tree gnu_field_type, gnu_field;
1653 /* Set the RM size before wrapping up the type. */
1654 TYPE_RM_SIZE (gnu_type)
1655 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1656 gnu_field_type = gnu_type;
1658 gnu_type = make_node (RECORD_TYPE);
1659 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1661 TYPE_ALIGN (gnu_type) = align;
1662 TYPE_PACKED (gnu_type) = 1;
1664 /* Create a stripped-down declaration of the original type, mainly
1666 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1667 debug_info_p, gnat_entity);
1669 /* Don't notify the field as "addressable", since we won't be taking
1670 it's address and it would prevent create_field_decl from making a
1672 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1673 gnu_field_type, gnu_type, 1, 0, 0, 0);
1675 finish_record_type (gnu_type, gnu_field, 0, false);
1676 TYPE_IS_PADDING_P (gnu_type) = 1;
1678 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1681 /* Otherwise reset the alignment lest we computed it above. */
1687 case E_Floating_Point_Type:
1688 /* If this is a VAX floating-point type, use an integer of the proper
1689 size. All the operations will be handled with ASM statements. */
1690 if (Vax_Float (gnat_entity))
1692 gnu_type = make_signed_type (esize);
1693 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1694 SET_TYPE_DIGITS_VALUE (gnu_type,
1695 UI_To_gnu (Digits_Value (gnat_entity),
1700 /* The type of the Low and High bounds can be our type if this is
1701 a type from Standard, so set them at the end of the function. */
1702 gnu_type = make_node (REAL_TYPE);
1703 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1704 layout_type (gnu_type);
1707 case E_Floating_Point_Subtype:
1708 if (Vax_Float (gnat_entity))
1710 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1716 && Present (Ancestor_Subtype (gnat_entity))
1717 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1718 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1719 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1720 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1723 gnu_type = make_node (REAL_TYPE);
1724 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1725 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1727 TYPE_MIN_VALUE (gnu_type)
1728 = convert (TREE_TYPE (gnu_type),
1729 elaborate_expression (Type_Low_Bound (gnat_entity),
1730 gnat_entity, get_identifier ("L"),
1732 Needs_Debug_Info (gnat_entity)));
1734 TYPE_MAX_VALUE (gnu_type)
1735 = convert (TREE_TYPE (gnu_type),
1736 elaborate_expression (Type_High_Bound (gnat_entity),
1737 gnat_entity, get_identifier ("U"),
1739 Needs_Debug_Info (gnat_entity)));
1741 /* One of the above calls might have caused us to be elaborated,
1742 so don't blow up if so. */
1743 if (present_gnu_tree (gnat_entity))
1745 maybe_present = true;
1749 layout_type (gnu_type);
1751 /* Inherit our alias set from what we're a subtype of, as for
1752 integer subtypes. */
1753 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1757 /* Array and String Types and Subtypes
1759 Unconstrained array types are represented by E_Array_Type and
1760 constrained array types are represented by E_Array_Subtype. There
1761 are no actual objects of an unconstrained array type; all we have
1762 are pointers to that type.
1764 The following fields are defined on array types and subtypes:
1766 Component_Type Component type of the array.
1767 Number_Dimensions Number of dimensions (an int).
1768 First_Index Type of first index. */
1773 tree gnu_template_fields = NULL_TREE;
1774 tree gnu_template_type = make_node (RECORD_TYPE);
1775 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1776 tree gnu_fat_type = make_node (RECORD_TYPE);
1777 int ndim = Number_Dimensions (gnat_entity);
1779 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1781 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1783 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
1784 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
1785 tree gnu_comp_size = 0;
1786 tree gnu_max_size = size_one_node;
1787 tree gnu_max_size_unit;
1788 Entity_Id gnat_ind_subtype;
1789 Entity_Id gnat_ind_base_subtype;
1790 tree gnu_template_reference;
1793 TYPE_NAME (gnu_template_type)
1794 = create_concat_name (gnat_entity, "XUB");
1796 /* Make a node for the array. If we are not defining the array
1797 suppress expanding incomplete types. */
1798 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1801 defer_incomplete_level++, this_deferred = true;
1803 /* Build the fat pointer type. Use a "void *" object instead of
1804 a pointer to the array type since we don't have the array type
1805 yet (it will reference the fat pointer via the bounds). */
1806 tem = chainon (chainon (NULL_TREE,
1807 create_field_decl (get_identifier ("P_ARRAY"),
1809 gnu_fat_type, 0, 0, 0, 0)),
1810 create_field_decl (get_identifier ("P_BOUNDS"),
1812 gnu_fat_type, 0, 0, 0, 0));
1814 /* Make sure we can put this into a register. */
1815 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1817 /* Do not finalize this record type since the types of its fields
1818 are still incomplete at this point. */
1819 finish_record_type (gnu_fat_type, tem, 0, true);
1820 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1822 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1823 is the fat pointer. This will be used to access the individual
1824 fields once we build them. */
1825 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1826 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1827 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1828 gnu_template_reference
1829 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1830 TREE_READONLY (gnu_template_reference) = 1;
1832 /* Now create the GCC type for each index and add the fields for
1833 that index to the template. */
1834 for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
1835 gnat_ind_base_subtype
1836 = First_Index (Implementation_Base_Type (gnat_entity));
1837 index < ndim && index >= 0;
1839 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1840 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1842 char field_name[10];
1843 tree gnu_ind_subtype
1844 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1845 tree gnu_base_subtype
1846 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1848 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1850 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1851 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1853 /* Make the FIELD_DECLs for the minimum and maximum of this
1854 type and then make extractions of that field from the
1856 sprintf (field_name, "LB%d", index);
1857 gnu_min_field = create_field_decl (get_identifier (field_name),
1859 gnu_template_type, 0, 0, 0, 0);
1860 field_name[0] = 'U';
1861 gnu_max_field = create_field_decl (get_identifier (field_name),
1863 gnu_template_type, 0, 0, 0, 0);
1865 Sloc_to_locus (Sloc (gnat_entity),
1866 &DECL_SOURCE_LOCATION (gnu_min_field));
1867 Sloc_to_locus (Sloc (gnat_entity),
1868 &DECL_SOURCE_LOCATION (gnu_max_field));
1869 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1871 /* We can't use build_component_ref here since the template
1872 type isn't complete yet. */
1873 gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype,
1874 gnu_template_reference, gnu_min_field,
1876 gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype,
1877 gnu_template_reference, gnu_max_field,
1879 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1881 /* Make a range type with the new ranges, but using
1882 the Ada subtype. Then we convert to sizetype. */
1883 gnu_index_types[index]
1884 = create_index_type (convert (sizetype, gnu_min),
1885 convert (sizetype, gnu_max),
1886 build_range_type (gnu_ind_subtype,
1889 /* Update the maximum size of the array, in elements. */
1891 = size_binop (MULT_EXPR, gnu_max_size,
1892 size_binop (PLUS_EXPR, size_one_node,
1893 size_binop (MINUS_EXPR, gnu_base_max,
1896 TYPE_NAME (gnu_index_types[index])
1897 = create_concat_name (gnat_entity, field_name);
1900 for (index = 0; index < ndim; index++)
1902 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1904 /* Install all the fields into the template. */
1905 finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
1906 TYPE_READONLY (gnu_template_type) = 1;
1908 /* Now make the array of arrays and update the pointer to the array
1909 in the fat pointer. Note that it is the first field. */
1910 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1912 /* Try to get a smaller form of the component if needed. */
1913 if ((Is_Packed (gnat_entity)
1914 || Has_Component_Size_Clause (gnat_entity))
1915 && !Is_Bit_Packed_Array (gnat_entity)
1916 && !Has_Aliased_Components (gnat_entity)
1917 && !Strict_Alignment (Component_Type (gnat_entity))
1918 && TREE_CODE (tem) == RECORD_TYPE
1919 && !TYPE_IS_FAT_POINTER_P (tem)
1920 && host_integerp (TYPE_SIZE (tem), 1))
1921 tem = make_packable_type (tem, false);
1923 if (Has_Atomic_Components (gnat_entity))
1924 check_ok_for_atomic (tem, gnat_entity, true);
1926 /* Get and validate any specified Component_Size, but if Packed,
1927 ignore it since the front end will have taken care of it. */
1929 = validate_size (Component_Size (gnat_entity), tem,
1931 (Is_Bit_Packed_Array (gnat_entity)
1932 ? TYPE_DECL : VAR_DECL),
1933 true, Has_Component_Size_Clause (gnat_entity));
1935 /* If the component type is a RECORD_TYPE that has a self-referential
1936 size, use the maximum size. */
1937 if (!gnu_comp_size && TREE_CODE (tem) == RECORD_TYPE
1938 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1939 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1941 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
1944 tem = make_type_from_size (tem, gnu_comp_size, false);
1946 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1947 "C_PAD", false, definition, true);
1948 /* If a padding record was made, declare it now since it will
1949 never be declared otherwise. This is necessary to ensure
1950 that its subtrees are properly marked. */
1951 if (tem != orig_tem)
1952 create_type_decl (TYPE_NAME (tem), tem, NULL, true,
1953 debug_info_p, gnat_entity);
1956 if (Has_Volatile_Components (gnat_entity))
1957 tem = build_qualified_type (tem,
1958 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1960 /* If Component_Size is not already specified, annotate it with the
1961 size of the component. */
1962 if (Unknown_Component_Size (gnat_entity))
1963 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1965 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
1966 size_binop (MULT_EXPR, gnu_max_size,
1967 TYPE_SIZE_UNIT (tem)));
1968 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
1969 size_binop (MULT_EXPR,
1970 convert (bitsizetype,
1974 for (index = ndim - 1; index >= 0; index--)
1976 tem = build_array_type (tem, gnu_index_types[index]);
1977 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1978 if (array_type_has_nonaliased_component (gnat_entity, tem))
1979 TYPE_NONALIASED_COMPONENT (tem) = 1;
1982 /* If an alignment is specified, use it if valid. But ignore it for
1983 types that represent the unpacked base type for packed arrays. If
1984 the alignment was requested with an explicit user alignment clause,
1986 if (No (Packed_Array_Type (gnat_entity))
1987 && Known_Alignment (gnat_entity))
1989 gcc_assert (Present (Alignment (gnat_entity)));
1991 = validate_alignment (Alignment (gnat_entity), gnat_entity,
1993 if (Present (Alignment_Clause (gnat_entity)))
1994 TYPE_USER_ALIGN (tem) = 1;
1997 TYPE_CONVENTION_FORTRAN_P (tem)
1998 = (Convention (gnat_entity) == Convention_Fortran);
1999 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2001 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2002 corresponding fat pointer. */
2003 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2004 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2005 SET_TYPE_MODE (gnu_type, BLKmode);
2006 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2007 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2009 /* If the maximum size doesn't overflow, use it. */
2010 if (TREE_CODE (gnu_max_size) == INTEGER_CST
2011 && !TREE_OVERFLOW (gnu_max_size))
2013 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
2014 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2015 && !TREE_OVERFLOW (gnu_max_size_unit))
2016 TYPE_SIZE_UNIT (tem)
2017 = size_binop (MIN_EXPR, gnu_max_size_unit,
2018 TYPE_SIZE_UNIT (tem));
2020 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2021 tem, NULL, !Comes_From_Source (gnat_entity),
2022 debug_info_p, gnat_entity);
2024 /* Give the fat pointer type a name. */
2025 create_type_decl (create_concat_name (gnat_entity, "XUP"),
2026 gnu_fat_type, NULL, true,
2027 debug_info_p, gnat_entity);
2029 /* Create the type to be used as what a thin pointer designates: an
2030 record type for the object and its template with the field offsets
2031 shifted to have the template at a negative offset. */
2032 tem = build_unc_object_type (gnu_template_type, tem,
2033 create_concat_name (gnat_entity, "XUT"));
2034 shift_unc_components_for_thin_pointers (tem);
2036 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2037 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2039 /* Give the thin pointer type a name. */
2040 create_type_decl (create_concat_name (gnat_entity, "XUX"),
2041 build_pointer_type (tem), NULL, true,
2042 debug_info_p, gnat_entity);
2046 case E_String_Subtype:
2047 case E_Array_Subtype:
2049 /* This is the actual data type for array variables. Multidimensional
2050 arrays are implemented in the gnu tree as arrays of arrays. Note
2051 that for the moment arrays which have sparse enumeration subtypes as
2052 index components create sparse arrays, which is obviously space
2053 inefficient but so much easier to code for now.
2055 Also note that the subtype never refers to the unconstrained
2056 array type, which is somewhat at variance with Ada semantics.
2058 First check to see if this is simply a renaming of the array
2059 type. If so, the result is the array type. */
2061 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2062 if (!Is_Constrained (gnat_entity))
2067 int array_dim = Number_Dimensions (gnat_entity);
2069 = ((Convention (gnat_entity) == Convention_Fortran)
2070 ? array_dim - 1 : 0);
2072 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
2073 Entity_Id gnat_ind_subtype;
2074 Entity_Id gnat_ind_base_subtype;
2075 tree gnu_base_type = gnu_type;
2076 tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
2077 tree gnu_comp_size = NULL_TREE;
2078 tree gnu_max_size = size_one_node;
2079 tree gnu_max_size_unit;
2080 bool need_index_type_struct = false;
2081 bool max_overflow = false;
2083 /* First create the gnu types for each index. Create types for
2084 debugging information to point to the index types if the
2085 are not integer types, have variable bounds, or are
2086 wider than sizetype. */
2088 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
2089 gnat_ind_base_subtype
2090 = First_Index (Implementation_Base_Type (gnat_entity));
2091 index < array_dim && index >= 0;
2093 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
2094 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
2096 tree gnu_index_subtype
2097 = get_unpadded_type (Etype (gnat_ind_subtype));
2099 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
2101 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
2102 tree gnu_base_subtype
2103 = get_unpadded_type (Etype (gnat_ind_base_subtype));
2105 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
2107 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
2108 tree gnu_base_type = get_base_type (gnu_base_subtype);
2109 tree gnu_base_base_min
2110 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
2111 tree gnu_base_base_max
2112 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
2116 /* If the minimum and maximum values both overflow in
2117 SIZETYPE, but the difference in the original type
2118 does not overflow in SIZETYPE, ignore the overflow
2120 if ((TYPE_PRECISION (gnu_index_subtype)
2121 > TYPE_PRECISION (sizetype)
2122 || TYPE_UNSIGNED (gnu_index_subtype)
2123 != TYPE_UNSIGNED (sizetype))
2124 && TREE_CODE (gnu_min) == INTEGER_CST
2125 && TREE_CODE (gnu_max) == INTEGER_CST
2126 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2128 (fold_build2 (MINUS_EXPR, gnu_index_subtype,
2129 TYPE_MAX_VALUE (gnu_index_subtype),
2130 TYPE_MIN_VALUE (gnu_index_subtype)))))
2132 TREE_OVERFLOW (gnu_min) = 0;
2133 TREE_OVERFLOW (gnu_max) = 0;
2136 /* Similarly, if the range is null, use bounds of 1..0 for
2137 the sizetype bounds. */
2138 else if ((TYPE_PRECISION (gnu_index_subtype)
2139 > TYPE_PRECISION (sizetype)
2140 || TYPE_UNSIGNED (gnu_index_subtype)
2141 != TYPE_UNSIGNED (sizetype))
2142 && TREE_CODE (gnu_min) == INTEGER_CST
2143 && TREE_CODE (gnu_max) == INTEGER_CST
2144 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2145 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
2146 TYPE_MIN_VALUE (gnu_index_subtype)))
2147 gnu_min = size_one_node, gnu_max = size_zero_node;
2149 /* Now compute the size of this bound. We need to provide
2150 GCC with an upper bound to use but have to deal with the
2151 "superflat" case. There are three ways to do this. If we
2152 can prove that the array can never be superflat, we can
2153 just use the high bound of the index subtype. If we can
2154 prove that the low bound minus one can't overflow, we
2155 can do this as MAX (hb, lb - 1). Otherwise, we have to use
2156 the expression hb >= lb ? hb : lb - 1. */
2157 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2159 /* See if the base array type is already flat. If it is, we
2160 are probably compiling an ACVC test, but it will cause the
2161 code below to malfunction if we don't handle it specially. */
2162 if (TREE_CODE (gnu_base_min) == INTEGER_CST
2163 && TREE_CODE (gnu_base_max) == INTEGER_CST
2164 && !TREE_OVERFLOW (gnu_base_min)
2165 && !TREE_OVERFLOW (gnu_base_max)
2166 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
2167 gnu_high = size_zero_node, gnu_min = size_one_node;
2169 /* If gnu_high is now an integer which overflowed, the array
2170 cannot be superflat. */
2171 else if (TREE_CODE (gnu_high) == INTEGER_CST
2172 && TREE_OVERFLOW (gnu_high))
2174 else if (TYPE_UNSIGNED (gnu_base_subtype)
2175 || TREE_CODE (gnu_high) == INTEGER_CST)
2176 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2180 (sizetype, build_binary_op (GE_EXPR, integer_type_node,
2184 gnu_index_type[index]
2185 = create_index_type (gnu_min, gnu_high, gnu_index_subtype,
2188 /* Also compute the maximum size of the array. Here we
2189 see if any constraint on the index type of the base type
2190 can be used in the case of self-referential bound on
2191 the index type of the subtype. We look for a non-"infinite"
2192 and non-self-referential bound from any type involved and
2193 handle each bound separately. */
2195 if ((TREE_CODE (gnu_min) == INTEGER_CST
2196 && !TREE_OVERFLOW (gnu_min)
2197 && !operand_equal_p (gnu_min, gnu_base_base_min, 0))
2198 || !CONTAINS_PLACEHOLDER_P (gnu_min)
2199 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2200 && !TREE_OVERFLOW (gnu_base_min)))
2201 gnu_base_min = gnu_min;
2203 if ((TREE_CODE (gnu_max) == INTEGER_CST
2204 && !TREE_OVERFLOW (gnu_max)
2205 && !operand_equal_p (gnu_max, gnu_base_base_max, 0))
2206 || !CONTAINS_PLACEHOLDER_P (gnu_max)
2207 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2208 && !TREE_OVERFLOW (gnu_base_max)))
2209 gnu_base_max = gnu_max;
2211 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2212 && TREE_OVERFLOW (gnu_base_min))
2213 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2214 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2215 && TREE_OVERFLOW (gnu_base_max))
2216 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2217 max_overflow = true;
2219 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
2220 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
2223 = size_binop (MAX_EXPR,
2224 size_binop (PLUS_EXPR, size_one_node,
2225 size_binop (MINUS_EXPR, gnu_base_max,
2229 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2230 && TREE_OVERFLOW (gnu_this_max))
2231 max_overflow = true;
2234 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2236 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
2237 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
2239 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
2240 || (TREE_TYPE (gnu_index_subtype)
2241 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
2243 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
2244 || (TYPE_PRECISION (gnu_index_subtype)
2245 > TYPE_PRECISION (sizetype)))
2246 need_index_type_struct = true;
2249 /* Then flatten: create the array of arrays. For an array type
2250 used to implement a packed array, get the component type from
2251 the original array type since the representation clauses that
2252 can affect it are on the latter. */
2253 if (Is_Packed_Array_Type (gnat_entity)
2254 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2256 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2257 for (index = array_dim - 1; index >= 0; index--)
2258 gnu_type = TREE_TYPE (gnu_type);
2260 /* One of the above calls might have caused us to be elaborated,
2261 so don't blow up if so. */
2262 if (present_gnu_tree (gnat_entity))
2264 maybe_present = true;
2270 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
2272 /* One of the above calls might have caused us to be elaborated,
2273 so don't blow up if so. */
2274 if (present_gnu_tree (gnat_entity))
2276 maybe_present = true;
2280 /* Try to get a smaller form of the component if needed. */
2281 if ((Is_Packed (gnat_entity)
2282 || Has_Component_Size_Clause (gnat_entity))
2283 && !Is_Bit_Packed_Array (gnat_entity)
2284 && !Has_Aliased_Components (gnat_entity)
2285 && !Strict_Alignment (Component_Type (gnat_entity))
2286 && TREE_CODE (gnu_type) == RECORD_TYPE
2287 && !TYPE_IS_FAT_POINTER_P (gnu_type)
2288 && host_integerp (TYPE_SIZE (gnu_type), 1))
2289 gnu_type = make_packable_type (gnu_type, false);
2291 /* Get and validate any specified Component_Size, but if Packed,
2292 ignore it since the front end will have taken care of it. */
2294 = validate_size (Component_Size (gnat_entity), gnu_type,
2296 (Is_Bit_Packed_Array (gnat_entity)
2297 ? TYPE_DECL : VAR_DECL), true,
2298 Has_Component_Size_Clause (gnat_entity));
2300 /* If the component type is a RECORD_TYPE that has a
2301 self-referential size, use the maximum size. */
2303 && TREE_CODE (gnu_type) == RECORD_TYPE
2304 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2305 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
2307 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
2311 = make_type_from_size (gnu_type, gnu_comp_size, false);
2312 orig_gnu_type = gnu_type;
2313 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
2314 gnat_entity, "C_PAD", false,
2316 /* If a padding record was made, declare it now since it
2317 will never be declared otherwise. This is necessary
2318 to ensure that its subtrees are properly marked. */
2319 if (gnu_type != orig_gnu_type)
2320 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL,
2321 true, debug_info_p, gnat_entity);
2324 if (Has_Volatile_Components (Base_Type (gnat_entity)))
2325 gnu_type = build_qualified_type (gnu_type,
2326 (TYPE_QUALS (gnu_type)
2327 | TYPE_QUAL_VOLATILE));
2330 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2331 TYPE_SIZE_UNIT (gnu_type));
2332 gnu_max_size = size_binop (MULT_EXPR,
2333 convert (bitsizetype, gnu_max_size),
2334 TYPE_SIZE (gnu_type));
2336 for (index = array_dim - 1; index >= 0; index --)
2338 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
2339 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2340 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2341 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2344 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2345 if (need_index_type_struct)
2346 TYPE_STUB_DECL (gnu_type)
2347 = create_type_stub_decl (gnu_entity_name, gnu_type);
2349 /* If we are at file level and this is a multi-dimensional array, we
2350 need to make a variable corresponding to the stride of the
2351 inner dimensions. */
2352 if (global_bindings_p () && array_dim > 1)
2354 tree gnu_str_name = get_identifier ("ST");
2357 for (gnu_arr_type = TREE_TYPE (gnu_type);
2358 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2359 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2360 gnu_str_name = concat_name (gnu_str_name, "ST"))
2362 tree eltype = TREE_TYPE (gnu_arr_type);
2364 TYPE_SIZE (gnu_arr_type)
2365 = elaborate_expression_1 (gnat_entity, gnat_entity,
2366 TYPE_SIZE (gnu_arr_type),
2367 gnu_str_name, definition, 0);
2369 /* ??? For now, store the size as a multiple of the
2370 alignment of the element type in bytes so that we
2371 can see the alignment from the tree. */
2372 TYPE_SIZE_UNIT (gnu_arr_type)
2374 (MULT_EXPR, sizetype,
2375 elaborate_expression_1
2376 (gnat_entity, gnat_entity,
2377 build_binary_op (EXACT_DIV_EXPR, sizetype,
2378 TYPE_SIZE_UNIT (gnu_arr_type),
2379 size_int (TYPE_ALIGN (eltype)
2381 concat_name (gnu_str_name, "A_U"), definition, 0),
2382 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2384 /* ??? create_type_decl is not invoked on the inner types so
2385 the MULT_EXPR node built above will never be marked. */
2386 mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type));
2390 /* If we need to write out a record type giving the names of
2391 the bounds, do it now. Make sure to reference the index
2392 types themselves, not just their names, as the debugger
2393 may fall back on them in some cases. */
2394 if (need_index_type_struct && debug_info_p)
2396 tree gnu_bound_rec = make_node (RECORD_TYPE);
2397 tree gnu_field_list = NULL_TREE;
2400 TYPE_NAME (gnu_bound_rec)
2401 = create_concat_name (gnat_entity, "XA");
2403 for (index = array_dim - 1; index >= 0; index--)
2405 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_type[index]);
2406 tree gnu_index_name = TYPE_NAME (gnu_index);
2408 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2409 gnu_index_name = DECL_NAME (gnu_index_name);
2411 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2413 0, NULL_TREE, NULL_TREE, 0);
2414 TREE_CHAIN (gnu_field) = gnu_field_list;
2415 gnu_field_list = gnu_field;
2418 finish_record_type (gnu_bound_rec, gnu_field_list, 0, false);
2419 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2422 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2423 = (Convention (gnat_entity) == Convention_Fortran);
2424 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2425 = (Is_Packed_Array_Type (gnat_entity)
2426 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2428 /* If our size depends on a placeholder and the maximum size doesn't
2429 overflow, use it. */
2430 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2431 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2432 && TREE_OVERFLOW (gnu_max_size))
2433 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2434 && TREE_OVERFLOW (gnu_max_size_unit))
2437 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2438 TYPE_SIZE (gnu_type));
2439 TYPE_SIZE_UNIT (gnu_type)
2440 = size_binop (MIN_EXPR, gnu_max_size_unit,
2441 TYPE_SIZE_UNIT (gnu_type));
2444 /* Set our alias set to that of our base type. This gives all
2445 array subtypes the same alias set. */
2446 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2449 /* If this is a packed type, make this type the same as the packed
2450 array type, but do some adjusting in the type first. */
2451 if (Present (Packed_Array_Type (gnat_entity)))
2453 Entity_Id gnat_index;
2454 tree gnu_inner_type;
2456 /* First finish the type we had been making so that we output
2457 debugging information for it. */
2459 = build_qualified_type (gnu_type,
2460 (TYPE_QUALS (gnu_type)
2461 | (TYPE_QUAL_VOLATILE
2462 * Treat_As_Volatile (gnat_entity))));
2464 /* Make it artificial only if the base type was artificial as well.
2465 That's sort of "morally" true and will make it possible for the
2466 debugger to look it up by name in DWARF more easily. */
2468 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2469 !Comes_From_Source (gnat_entity)
2470 && !Comes_From_Source (Etype (gnat_entity)),
2471 debug_info_p, gnat_entity);
2473 /* Save it as our equivalent in case the call below elaborates
2475 save_gnu_tree (gnat_entity, gnu_decl, false);
2477 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2479 this_made_decl = true;
2480 gnu_type = TREE_TYPE (gnu_decl);
2481 save_gnu_tree (gnat_entity, NULL_TREE, false);
2483 gnu_inner_type = gnu_type;
2484 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2485 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2486 || TYPE_IS_PADDING_P (gnu_inner_type)))
2487 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2489 /* We need to point the type we just made to our index type so
2490 the actual bounds can be put into a template. */
2492 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2493 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2494 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2495 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2497 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2499 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2500 If it is, we need to make another type. */
2501 if (TYPE_MODULAR_P (gnu_inner_type))
2505 gnu_subtype = make_node (INTEGER_TYPE);
2507 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2508 TYPE_MIN_VALUE (gnu_subtype)
2509 = TYPE_MIN_VALUE (gnu_inner_type);
2510 TYPE_MAX_VALUE (gnu_subtype)
2511 = TYPE_MAX_VALUE (gnu_inner_type);
2512 TYPE_PRECISION (gnu_subtype)
2513 = TYPE_PRECISION (gnu_inner_type);
2514 TYPE_UNSIGNED (gnu_subtype)
2515 = TYPE_UNSIGNED (gnu_inner_type);
2516 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2517 layout_type (gnu_subtype);
2519 gnu_inner_type = gnu_subtype;
2522 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2525 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2527 for (gnat_index = First_Index (gnat_entity);
2528 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2529 SET_TYPE_ACTUAL_BOUNDS
2531 tree_cons (NULL_TREE,
2532 get_unpadded_type (Etype (gnat_index)),
2533 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2535 if (Convention (gnat_entity) != Convention_Fortran)
2536 SET_TYPE_ACTUAL_BOUNDS
2538 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2540 if (TREE_CODE (gnu_type) == RECORD_TYPE
2541 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2542 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2546 /* Abort if packed array with no packed array type field set. */
2548 gcc_assert (!Is_Packed (gnat_entity));
2552 case E_String_Literal_Subtype:
2553 /* Create the type for a string literal. */
2555 Entity_Id gnat_full_type
2556 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2557 && Present (Full_View (Etype (gnat_entity)))
2558 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2559 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2560 tree gnu_string_array_type
2561 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2562 tree gnu_string_index_type
2563 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2564 (TYPE_DOMAIN (gnu_string_array_type))));
2565 tree gnu_lower_bound
2566 = convert (gnu_string_index_type,
2567 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2568 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2569 tree gnu_length = ssize_int (length - 1);
2570 tree gnu_upper_bound
2571 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2573 convert (gnu_string_index_type, gnu_length));
2575 = build_range_type (gnu_string_index_type,
2576 gnu_lower_bound, gnu_upper_bound);
2578 = create_index_type (convert (sizetype,
2579 TYPE_MIN_VALUE (gnu_range_type)),
2581 TYPE_MAX_VALUE (gnu_range_type)),
2582 gnu_range_type, gnat_entity);
2585 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2587 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2588 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2589 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2593 /* Record Types and Subtypes
2595 The following fields are defined on record types:
2597 Has_Discriminants True if the record has discriminants
2598 First_Discriminant Points to head of list of discriminants
2599 First_Entity Points to head of list of fields
2600 Is_Tagged_Type True if the record is tagged
2602 Implementation of Ada records and discriminated records:
2604 A record type definition is transformed into the equivalent of a C
2605 struct definition. The fields that are the discriminants which are
2606 found in the Full_Type_Declaration node and the elements of the
2607 Component_List found in the Record_Type_Definition node. The
2608 Component_List can be a recursive structure since each Variant of
2609 the Variant_Part of the Component_List has a Component_List.
2611 Processing of a record type definition comprises starting the list of
2612 field declarations here from the discriminants and the calling the
2613 function components_to_record to add the rest of the fields from the
2614 component list and return the gnu type node. The function
2615 components_to_record will call itself recursively as it traverses
2619 if (Has_Complex_Representation (gnat_entity))
2622 = build_complex_type
2624 (Etype (Defining_Entity
2625 (First (Component_Items
2628 (Declaration_Node (gnat_entity)))))))));
2634 Node_Id full_definition = Declaration_Node (gnat_entity);
2635 Node_Id record_definition = Type_Definition (full_definition);
2636 Entity_Id gnat_field;
2638 tree gnu_field_list = NULL_TREE;
2639 tree gnu_get_parent;
2640 /* Set PACKED in keeping with gnat_to_gnu_field. */
2642 = Is_Packed (gnat_entity)
2644 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2646 : (Known_Alignment (gnat_entity)
2647 || (Strict_Alignment (gnat_entity)
2648 && Known_Static_Esize (gnat_entity)))
2651 bool has_rep = Has_Specified_Layout (gnat_entity);
2652 bool all_rep = has_rep;
2654 = (Is_Tagged_Type (gnat_entity)
2655 && Nkind (record_definition) == N_Derived_Type_Definition);
2657 /* See if all fields have a rep clause. Stop when we find one
2659 for (gnat_field = First_Entity (gnat_entity);
2660 Present (gnat_field) && all_rep;
2661 gnat_field = Next_Entity (gnat_field))
2662 if ((Ekind (gnat_field) == E_Component
2663 || Ekind (gnat_field) == E_Discriminant)
2664 && No (Component_Clause (gnat_field)))
2667 /* If this is a record extension, go a level further to find the
2668 record definition. Also, verify we have a Parent_Subtype. */
2671 if (!type_annotate_only
2672 || Present (Record_Extension_Part (record_definition)))
2673 record_definition = Record_Extension_Part (record_definition);
2675 gcc_assert (type_annotate_only
2676 || Present (Parent_Subtype (gnat_entity)));
2679 /* Make a node for the record. If we are not defining the record,
2680 suppress expanding incomplete types. */
2681 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2682 TYPE_NAME (gnu_type) = gnu_entity_name;
2683 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2686 defer_incomplete_level++, this_deferred = true;
2688 /* If both a size and rep clause was specified, put the size in
2689 the record type now so that it can get the proper mode. */
2690 if (has_rep && Known_Esize (gnat_entity))
2691 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2693 /* Always set the alignment here so that it can be used to
2694 set the mode, if it is making the alignment stricter. If
2695 it is invalid, it will be checked again below. If this is to
2696 be Atomic, choose a default alignment of a word unless we know
2697 the size and it's smaller. */
2698 if (Known_Alignment (gnat_entity))
2699 TYPE_ALIGN (gnu_type)
2700 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2701 else if (Is_Atomic (gnat_entity))
2702 TYPE_ALIGN (gnu_type)
2703 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2704 /* If a type needs strict alignment, the minimum size will be the
2705 type size instead of the RM size (see validate_size). Cap the
2706 alignment, lest it causes this type size to become too large. */
2707 else if (Strict_Alignment (gnat_entity)
2708 && Known_Static_Esize (gnat_entity))
2710 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2711 unsigned int raw_align = raw_size & -raw_size;
2712 if (raw_align < BIGGEST_ALIGNMENT)
2713 TYPE_ALIGN (gnu_type) = raw_align;
2716 TYPE_ALIGN (gnu_type) = 0;
2718 /* If we have a Parent_Subtype, make a field for the parent. If
2719 this record has rep clauses, force the position to zero. */
2720 if (Present (Parent_Subtype (gnat_entity)))
2722 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2725 /* A major complexity here is that the parent subtype will
2726 reference our discriminants in its Discriminant_Constraint
2727 list. But those must reference the parent component of this
2728 record which is of the parent subtype we have not built yet!
2729 To break the circle we first build a dummy COMPONENT_REF which
2730 represents the "get to the parent" operation and initialize
2731 each of those discriminants to a COMPONENT_REF of the above
2732 dummy parent referencing the corresponding discriminant of the
2733 base type of the parent subtype. */
2734 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2735 build0 (PLACEHOLDER_EXPR, gnu_type),
2736 build_decl (FIELD_DECL, NULL_TREE,
2740 if (Has_Discriminants (gnat_entity))
2741 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2742 Present (gnat_field);
2743 gnat_field = Next_Stored_Discriminant (gnat_field))
2744 if (Present (Corresponding_Discriminant (gnat_field)))
2747 build3 (COMPONENT_REF,
2748 get_unpadded_type (Etype (gnat_field)),
2750 gnat_to_gnu_field_decl (Corresponding_Discriminant
2755 /* Then we build the parent subtype. If it has discriminants but
2756 the type itself has unknown discriminants, this means that it
2757 doesn't contain information about how the discriminants are
2758 derived from those of the ancestor type, so it cannot be used
2759 directly. Instead it is built by cloning the parent subtype
2760 of the underlying record view of the type, for which the above
2761 derivation of discriminants has been made explicit. */
2762 if (Has_Discriminants (gnat_parent)
2763 && Has_Unknown_Discriminants (gnat_entity))
2765 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2767 /* If we are defining the type, the underlying record
2768 view must already have been elaborated at this point.
2769 Otherwise do it now as its parent subtype cannot be
2770 technically elaborated on its own. */
2772 gcc_assert (present_gnu_tree (gnat_uview));
2774 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2776 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2778 /* Substitute the "get to the parent" of the type for that
2779 of its underlying record view in the cloned type. */
2780 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2781 Present (gnat_field);
2782 gnat_field = Next_Stored_Discriminant (gnat_field))
2783 if (Present (Corresponding_Discriminant (gnat_field)))
2785 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2787 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2788 gnu_get_parent, gnu_field, NULL_TREE);
2790 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2794 gnu_parent = gnat_to_gnu_type (gnat_parent);
2796 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2797 initially built. The discriminants must reference the fields
2798 of the parent subtype and not those of its base type for the
2799 placeholder machinery to properly work. */
2800 if (Has_Discriminants (gnat_entity))
2801 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2802 Present (gnat_field);
2803 gnat_field = Next_Stored_Discriminant (gnat_field))
2804 if (Present (Corresponding_Discriminant (gnat_field)))
2806 Entity_Id field = Empty;
2807 for (field = First_Stored_Discriminant (gnat_parent);
2809 field = Next_Stored_Discriminant (field))
2810 if (same_discriminant_p (gnat_field, field))
2812 gcc_assert (Present (field));
2813 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2814 = gnat_to_gnu_field_decl (field);
2817 /* The "get to the parent" COMPONENT_REF must be given its
2819 TREE_TYPE (gnu_get_parent) = gnu_parent;
2821 /* ...and reference the _parent field of this record. */
2823 = create_field_decl (get_identifier
2824 (Get_Name_String (Name_uParent)),
2825 gnu_parent, gnu_type, 0,
2826 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2827 has_rep ? bitsize_zero_node : 0, 1);
2828 DECL_INTERNAL_P (gnu_field_list) = 1;
2829 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2832 /* Make the fields for the discriminants and put them into the record
2833 unless it's an Unchecked_Union. */
2834 if (Has_Discriminants (gnat_entity))
2835 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2836 Present (gnat_field);
2837 gnat_field = Next_Stored_Discriminant (gnat_field))
2839 /* If this is a record extension and this discriminant
2840 is the renaming of another discriminant, we've already
2841 handled the discriminant above. */
2842 if (Present (Parent_Subtype (gnat_entity))
2843 && Present (Corresponding_Discriminant (gnat_field)))
2847 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2849 /* Make an expression using a PLACEHOLDER_EXPR from the
2850 FIELD_DECL node just created and link that with the
2851 corresponding GNAT defining identifier. Then add to the
2853 save_gnu_tree (gnat_field,
2854 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2855 build0 (PLACEHOLDER_EXPR,
2856 DECL_CONTEXT (gnu_field)),
2857 gnu_field, NULL_TREE),
2860 if (!Is_Unchecked_Union (gnat_entity))
2862 TREE_CHAIN (gnu_field) = gnu_field_list;
2863 gnu_field_list = gnu_field;
2867 /* Put the discriminants into the record (backwards), so we can
2868 know the appropriate discriminant to use for the names of the
2870 TYPE_FIELDS (gnu_type) = gnu_field_list;
2872 /* Add the listed fields into the record and finish it up. */
2873 components_to_record (gnu_type, Component_List (record_definition),
2874 gnu_field_list, packed, definition, NULL,
2875 false, all_rep, false,
2876 Is_Unchecked_Union (gnat_entity));
2878 /* We used to remove the associations of the discriminants and
2879 _Parent for validity checking, but we may need them if there's
2880 Freeze_Node for a subtype used in this record. */
2881 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2882 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2884 /* If it is a tagged record force the type to BLKmode to insure
2885 that these objects will always be placed in memory. Do the
2886 same thing for limited record types. */
2887 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2888 SET_TYPE_MODE (gnu_type, BLKmode);
2890 /* Fill in locations of fields. */
2891 annotate_rep (gnat_entity, gnu_type);
2893 /* If there are any entities in the chain corresponding to
2894 components that we did not elaborate, ensure we elaborate their
2895 types if they are Itypes. */
2896 for (gnat_temp = First_Entity (gnat_entity);
2897 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2898 if ((Ekind (gnat_temp) == E_Component
2899 || Ekind (gnat_temp) == E_Discriminant)
2900 && Is_Itype (Etype (gnat_temp))
2901 && !present_gnu_tree (gnat_temp))
2902 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2906 case E_Class_Wide_Subtype:
2907 /* If an equivalent type is present, that is what we should use.
2908 Otherwise, fall through to handle this like a record subtype
2909 since it may have constraints. */
2910 if (gnat_equiv_type != gnat_entity)
2912 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2913 maybe_present = true;
2917 /* ... fall through ... */
2919 case E_Record_Subtype:
2921 /* If Cloned_Subtype is Present it means this record subtype has
2922 identical layout to that type or subtype and we should use
2923 that GCC type for this one. The front end guarantees that
2924 the component list is shared. */
2925 if (Present (Cloned_Subtype (gnat_entity)))
2927 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2929 maybe_present = true;
2932 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2933 changing the type, make a new type with each field having the
2934 type of the field in the new subtype but having the position
2935 computed by transforming every discriminant reference according
2936 to the constraints. We don't see any difference between
2937 private and nonprivate type here since derivations from types should
2938 have been deferred until the completion of the private type. */
2941 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2946 defer_incomplete_level++, this_deferred = true;
2948 /* Get the base type initially for its alignment and sizes. But
2949 if it is a padded type, we do all the other work with the
2951 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
2953 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
2954 && TYPE_IS_PADDING_P (gnu_base_type))
2955 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
2957 gnu_type = gnu_orig_type = gnu_base_type;
2959 if (present_gnu_tree (gnat_entity))
2961 maybe_present = true;
2965 /* When the type has discriminants, and these discriminants
2966 affect the shape of what it built, factor them in.
2968 If we are making a subtype of an Unchecked_Union (must be an
2969 Itype), just return the type.
2971 We can't just use Is_Constrained because private subtypes without
2972 discriminants of full types with discriminants with default
2973 expressions are Is_Constrained but aren't constrained! */
2975 if (IN (Ekind (gnat_base_type), Record_Kind)
2976 && !Is_For_Access_Subtype (gnat_entity)
2977 && !Is_Unchecked_Union (gnat_base_type)
2978 && Is_Constrained (gnat_entity)
2979 && Stored_Constraint (gnat_entity) != No_Elist
2980 && Present (Discriminant_Constraint (gnat_entity)))
2982 Entity_Id gnat_field;
2983 tree gnu_field_list = 0;
2985 = compute_field_positions (gnu_orig_type, NULL_TREE,
2986 size_zero_node, bitsize_zero_node,
2989 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
2993 gnu_type = make_node (RECORD_TYPE);
2994 TYPE_NAME (gnu_type) = gnu_entity_name;
2995 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2997 /* Set the size, alignment and alias set of the new type to
2998 match that of the old one, doing required substitutions.
2999 We do it this early because we need the size of the new
3000 type below to discard old fields if necessary. */
3001 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
3002 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
3003 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
3004 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
3005 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
3007 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3008 for (gnu_temp = gnu_subst_list;
3009 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3010 TYPE_SIZE (gnu_type)
3011 = substitute_in_expr (TYPE_SIZE (gnu_type),
3012 TREE_PURPOSE (gnu_temp),
3013 TREE_VALUE (gnu_temp));
3015 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
3016 for (gnu_temp = gnu_subst_list;
3017 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3018 TYPE_SIZE_UNIT (gnu_type)
3019 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
3020 TREE_PURPOSE (gnu_temp),
3021 TREE_VALUE (gnu_temp));
3023 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
3024 for (gnu_temp = gnu_subst_list;
3025 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3027 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3028 TREE_PURPOSE (gnu_temp),
3029 TREE_VALUE (gnu_temp)));
3031 for (gnat_field = First_Entity (gnat_entity);
3032 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3033 if ((Ekind (gnat_field) == E_Component
3034 || Ekind (gnat_field) == E_Discriminant)
3035 && (Underlying_Type (Scope (Original_Record_Component
3038 && (No (Corresponding_Discriminant (gnat_field))
3039 || !Is_Tagged_Type (gnat_base_type)))
3042 = gnat_to_gnu_field_decl (Original_Record_Component
3045 = TREE_VALUE (purpose_member (gnu_old_field,
3047 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3048 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3050 = gnat_to_gnu_type (Etype (gnat_field));
3051 tree gnu_size = TYPE_SIZE (gnu_field_type);
3052 tree gnu_new_pos = NULL_TREE;
3053 unsigned int offset_align
3054 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
3058 /* If there was a component clause, the field types must be
3059 the same for the type and subtype, so copy the data from
3060 the old field to avoid recomputation here. Also if the
3061 field is justified modular and the optimization in
3062 gnat_to_gnu_field was applied. */
3063 if (Present (Component_Clause
3064 (Original_Record_Component (gnat_field)))
3065 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3066 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3067 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3068 == TREE_TYPE (gnu_old_field)))
3070 gnu_size = DECL_SIZE (gnu_old_field);
3071 gnu_field_type = TREE_TYPE (gnu_old_field);
3074 /* If the old field was packed and of constant size, we
3075 have to get the old size here, as it might differ from
3076 what the Etype conveys and the latter might overlap
3077 onto the following field. Try to arrange the type for
3078 possible better packing along the way. */
3079 else if (DECL_PACKED (gnu_old_field)
3080 && TREE_CODE (DECL_SIZE (gnu_old_field))
3083 gnu_size = DECL_SIZE (gnu_old_field);
3084 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3085 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
3086 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3088 = make_packable_type (gnu_field_type, true);
3091 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3092 for (gnu_temp = gnu_subst_list;
3093 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3094 gnu_pos = substitute_in_expr (gnu_pos,
3095 TREE_PURPOSE (gnu_temp),
3096 TREE_VALUE (gnu_temp));
3098 /* If the position is now a constant, we can set it as the
3099 position of the field when we make it. Otherwise, we need
3100 to deal with it specially below. */
3101 if (TREE_CONSTANT (gnu_pos))
3103 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3105 /* Discard old fields that are outside the new type.
3106 This avoids confusing code scanning it to decide
3107 how to pass it to functions on some platforms. */
3108 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3109 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3110 && !integer_zerop (gnu_size)
3111 && !tree_int_cst_lt (gnu_new_pos,
3112 TYPE_SIZE (gnu_type)))
3118 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3119 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3120 !DECL_NONADDRESSABLE_P (gnu_old_field));
3122 if (!TREE_CONSTANT (gnu_pos))
3124 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3125 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3126 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3127 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3128 DECL_SIZE (gnu_field) = gnu_size;
3129 DECL_SIZE_UNIT (gnu_field)
3130 = convert (sizetype,
3131 size_binop (CEIL_DIV_EXPR, gnu_size,
3132 bitsize_unit_node));
3133 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3136 DECL_INTERNAL_P (gnu_field)
3137 = DECL_INTERNAL_P (gnu_old_field);
3138 SET_DECL_ORIGINAL_FIELD
3139 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3140 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3142 DECL_DISCRIMINANT_NUMBER (gnu_field)
3143 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3144 TREE_THIS_VOLATILE (gnu_field)
3145 = TREE_THIS_VOLATILE (gnu_old_field);
3147 /* To match the layout crafted in components_to_record, if
3148 this is the _Tag field, put it before any discriminants
3149 instead of after them as for all other fields. */
3150 if (Chars (gnat_field) == Name_uTag)
3151 gnu_field_list = chainon (gnu_field_list, gnu_field);
3154 TREE_CHAIN (gnu_field) = gnu_field_list;
3155 gnu_field_list = gnu_field;
3158 save_gnu_tree (gnat_field, gnu_field, false);
3161 /* Now go through the entities again looking for Itypes that
3162 we have not elaborated but should (e.g., Etypes of fields
3163 that have Original_Components). */
3164 for (gnat_field = First_Entity (gnat_entity);
3165 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3166 if ((Ekind (gnat_field) == E_Discriminant
3167 || Ekind (gnat_field) == E_Component)
3168 && !present_gnu_tree (Etype (gnat_field)))
3169 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3171 /* Do not finalize it since we're going to modify it below. */
3172 gnu_field_list = nreverse (gnu_field_list);
3173 finish_record_type (gnu_type, gnu_field_list, 2, true);
3175 /* Finalize size and mode. */
3176 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3177 TYPE_SIZE_UNIT (gnu_type)
3178 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3180 compute_record_mode (gnu_type);
3182 /* Fill in locations of fields. */
3183 annotate_rep (gnat_entity, gnu_type);
3185 /* We've built a new type, make an XVS type to show what this
3186 is a subtype of. Some debuggers require the XVS type to be
3187 output first, so do it in that order. */
3190 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3191 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
3193 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
3194 gnu_orig_name = DECL_NAME (gnu_orig_name);
3196 TYPE_NAME (gnu_subtype_marker)
3197 = create_concat_name (gnat_entity, "XVS");
3198 finish_record_type (gnu_subtype_marker,
3199 create_field_decl (gnu_orig_name,
3206 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3207 gnu_subtype_marker);
3210 /* Now we can finalize it. */
3211 rest_of_record_type_compilation (gnu_type);
3214 /* Otherwise, go down all the components in the new type and
3215 make them equivalent to those in the base type. */
3217 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3218 gnat_temp = Next_Entity (gnat_temp))
3219 if ((Ekind (gnat_temp) == E_Discriminant
3220 && !Is_Unchecked_Union (gnat_base_type))
3221 || Ekind (gnat_temp) == E_Component)
3222 save_gnu_tree (gnat_temp,
3223 gnat_to_gnu_field_decl
3224 (Original_Record_Component (gnat_temp)), false);
3228 case E_Access_Subprogram_Type:
3229 /* Use the special descriptor type for dispatch tables if needed,
3230 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3231 Note that we are only required to do so for static tables in
3232 order to be compatible with the C++ ABI, but Ada 2005 allows
3233 to extend library level tagged types at the local level so
3234 we do it in the non-static case as well. */
3235 if (TARGET_VTABLE_USES_DESCRIPTORS
3236 && Is_Dispatch_Table_Entity (gnat_entity))
3238 gnu_type = fdesc_type_node;
3239 gnu_size = TYPE_SIZE (gnu_type);
3243 /* ... fall through ... */
3245 case E_Anonymous_Access_Subprogram_Type:
3246 /* If we are not defining this entity, and we have incomplete
3247 entities being processed above us, make a dummy type and
3248 fill it in later. */
3249 if (!definition && defer_incomplete_level != 0)
3251 struct incomplete *p
3252 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3255 = build_pointer_type
3256 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3257 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3258 !Comes_From_Source (gnat_entity),
3259 debug_info_p, gnat_entity);
3260 this_made_decl = true;
3261 gnu_type = TREE_TYPE (gnu_decl);
3262 save_gnu_tree (gnat_entity, gnu_decl, false);
3265 p->old_type = TREE_TYPE (gnu_type);
3266 p->full_type = Directly_Designated_Type (gnat_entity);
3267 p->next = defer_incomplete_list;
3268 defer_incomplete_list = p;
3272 /* ... fall through ... */
3274 case E_Allocator_Type:
3276 case E_Access_Attribute_Type:
3277 case E_Anonymous_Access_Type:
3278 case E_General_Access_Type:
3280 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3281 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3282 bool is_from_limited_with
3283 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3284 && From_With_Type (gnat_desig_equiv));
3286 /* Get the "full view" of this entity. If this is an incomplete
3287 entity from a limited with, treat its non-limited view as the full
3288 view. Otherwise, if this is an incomplete or private type, use the
3289 full view. In the former case, we might point to a private type,
3290 in which case, we need its full view. Also, we want to look at the
3291 actual type used for the representation, so this takes a total of
3293 Entity_Id gnat_desig_full_direct_first
3294 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3295 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3296 ? Full_View (gnat_desig_equiv) : Empty));
3297 Entity_Id gnat_desig_full_direct
3298 = ((is_from_limited_with
3299 && Present (gnat_desig_full_direct_first)
3300 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3301 ? Full_View (gnat_desig_full_direct_first)
3302 : gnat_desig_full_direct_first);
3303 Entity_Id gnat_desig_full
3304 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3306 /* This the type actually used to represent the designated type,
3307 either gnat_desig_full or gnat_desig_equiv. */
3308 Entity_Id gnat_desig_rep;
3310 /* True if this is a pointer to an unconstrained array. */
3311 bool is_unconstrained_array;
3313 /* We want to know if we'll be seeing the freeze node for any
3314 incomplete type we may be pointing to. */
3316 = (Present (gnat_desig_full)
3317 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3318 : In_Extended_Main_Code_Unit (gnat_desig_type));
3320 /* True if we make a dummy type here. */
3321 bool got_fat_p = false;
3322 /* True if the dummy is a fat pointer. */
3323 bool made_dummy = false;
3324 tree gnu_desig_type = NULL_TREE;
3325 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3327 if (!targetm.valid_pointer_mode (p_mode))
3330 /* If either the designated type or its full view is an unconstrained
3331 array subtype, replace it with the type it's a subtype of. This
3332 avoids problems with multiple copies of unconstrained array types.
3333 Likewise, if the designated type is a subtype of an incomplete
3334 record type, use the parent type to avoid order of elaboration
3335 issues. This can lose some code efficiency, but there is no
3337 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3338 && ! Is_Constrained (gnat_desig_equiv))
3339 gnat_desig_equiv = Etype (gnat_desig_equiv);
3340 if (Present (gnat_desig_full)
3341 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3342 && ! Is_Constrained (gnat_desig_full))
3343 || (Ekind (gnat_desig_full) == E_Record_Subtype
3344 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3345 gnat_desig_full = Etype (gnat_desig_full);
3347 /* Now set the type that actually marks the representation of
3348 the designated type and also flag whether we have a unconstrained
3350 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3351 is_unconstrained_array
3352 = (Is_Array_Type (gnat_desig_rep)
3353 && ! Is_Constrained (gnat_desig_rep));
3355 /* If we are pointing to an incomplete type whose completion is an
3356 unconstrained array, make a fat pointer type. The two types in our
3357 fields will be pointers to dummy nodes and will be replaced in
3358 update_pointer_to. Similarly, if the type itself is a dummy type or
3359 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3360 in case we have any thin pointers to it. */
3361 if (is_unconstrained_array
3362 && (Present (gnat_desig_full)
3363 || (present_gnu_tree (gnat_desig_equiv)
3364 && TYPE_IS_DUMMY_P (TREE_TYPE
3365 (get_gnu_tree (gnat_desig_equiv))))
3366 || (No (gnat_desig_full) && ! in_main_unit
3367 && defer_incomplete_level != 0
3368 && ! present_gnu_tree (gnat_desig_equiv))
3369 || (in_main_unit && is_from_limited_with
3370 && Present (Freeze_Node (gnat_desig_rep)))))
3374 if (present_gnu_tree (gnat_desig_rep))
3375 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3378 gnu_old = make_dummy_type (gnat_desig_rep);
3380 /* Show the dummy we get will be a fat pointer. */
3381 got_fat_p = made_dummy = true;
3384 /* If the call above got something that has a pointer, that
3385 pointer is our type. This could have happened either
3386 because the type was elaborated or because somebody
3387 else executed the code below. */
3388 gnu_type = TYPE_POINTER_TO (gnu_old);
3391 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3392 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3393 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3394 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3397 TYPE_NAME (gnu_template_type)
3398 = create_concat_name (gnat_desig_equiv, "XUB");
3399 TYPE_DUMMY_P (gnu_template_type) = 1;
3401 TYPE_NAME (gnu_array_type)
3402 = create_concat_name (gnat_desig_equiv, "XUA");
3403 TYPE_DUMMY_P (gnu_array_type) = 1;
3405 gnu_type = make_node (RECORD_TYPE);
3406 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3407 TYPE_POINTER_TO (gnu_old) = gnu_type;
3409 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3411 = chainon (chainon (NULL_TREE,
3413 (get_identifier ("P_ARRAY"),
3415 gnu_type, 0, 0, 0, 0)),
3416 create_field_decl (get_identifier ("P_BOUNDS"),
3418 gnu_type, 0, 0, 0, 0));
3420 /* Make sure we can place this into a register. */
3421 TYPE_ALIGN (gnu_type)
3422 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3423 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3425 /* Do not finalize this record type since the types of
3426 its fields are incomplete. */
3427 finish_record_type (gnu_type, fields, 0, true);
3429 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3430 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3431 = create_concat_name (gnat_desig_equiv, "XUT");
3432 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3436 /* If we already know what the full type is, use it. */
3437 else if (Present (gnat_desig_full)
3438 && present_gnu_tree (gnat_desig_full))
3439 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3441 /* Get the type of the thing we are to point to and build a pointer
3442 to it. If it is a reference to an incomplete or private type with a
3443 full view that is a record, make a dummy type node and get the
3444 actual type later when we have verified it is safe. */
3445 else if ((! in_main_unit
3446 && ! present_gnu_tree (gnat_desig_equiv)
3447 && Present (gnat_desig_full)
3448 && ! present_gnu_tree (gnat_desig_full)
3449 && Is_Record_Type (gnat_desig_full))
3450 /* Likewise if we are pointing to a record or array and we
3451 are to defer elaborating incomplete types. We do this
3452 since this access type may be the full view of some
3453 private type. Note that the unconstrained array case is
3455 || ((! in_main_unit || imported_p)
3456 && defer_incomplete_level != 0
3457 && ! present_gnu_tree (gnat_desig_equiv)
3458 && ((Is_Record_Type (gnat_desig_rep)
3459 || Is_Array_Type (gnat_desig_rep))))
3460 /* If this is a reference from a limited_with type back to our
3461 main unit and there's a Freeze_Node for it, either we have
3462 already processed the declaration and made the dummy type,
3463 in which case we just reuse the latter, or we have not yet,
3464 in which case we make the dummy type and it will be reused
3465 when the declaration is processed. In both cases, the
3466 pointer eventually created below will be automatically
3467 adjusted when the Freeze_Node is processed. Note that the
3468 unconstrained array case is handled above. */
3469 || (in_main_unit && is_from_limited_with
3470 && Present (Freeze_Node (gnat_desig_rep))))
3472 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3476 /* Otherwise handle the case of a pointer to itself. */
3477 else if (gnat_desig_equiv == gnat_entity)
3480 = build_pointer_type_for_mode (void_type_node, p_mode,
3481 No_Strict_Aliasing (gnat_entity));
3482 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3485 /* If expansion is disabled, the equivalent type of a concurrent
3486 type is absent, so build a dummy pointer type. */
3487 else if (type_annotate_only && No (gnat_desig_equiv))
3488 gnu_type = ptr_void_type_node;
3490 /* Finally, handle the straightforward case where we can just
3491 elaborate our designated type and point to it. */
3493 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3495 /* It is possible that a call to gnat_to_gnu_type above resolved our
3496 type. If so, just return it. */
3497 if (present_gnu_tree (gnat_entity))
3499 maybe_present = true;
3503 /* If we have a GCC type for the designated type, possibly modify it
3504 if we are pointing only to constant objects and then make a pointer
3505 to it. Don't do this for unconstrained arrays. */
3506 if (!gnu_type && gnu_desig_type)
3508 if (Is_Access_Constant (gnat_entity)
3509 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3512 = build_qualified_type
3514 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3516 /* Some extra processing is required if we are building a
3517 pointer to an incomplete type (in the GCC sense). We might
3518 have such a type if we just made a dummy, or directly out
3519 of the call to gnat_to_gnu_type above if we are processing
3520 an access type for a record component designating the
3521 record type itself. */
3522 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3524 /* We must ensure that the pointer to variant we make will
3525 be processed by update_pointer_to when the initial type
3526 is completed. Pretend we made a dummy and let further
3527 processing act as usual. */
3530 /* We must ensure that update_pointer_to will not retrieve
3531 the dummy variant when building a properly qualified
3532 version of the complete type. We take advantage of the
3533 fact that get_qualified_type is requiring TYPE_NAMEs to
3534 match to influence build_qualified_type and then also
3535 update_pointer_to here. */
3536 TYPE_NAME (gnu_desig_type)
3537 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3542 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3543 No_Strict_Aliasing (gnat_entity));
3546 /* If we are not defining this object and we made a dummy pointer,
3547 save our current definition, evaluate the actual type, and replace
3548 the tentative type we made with the actual one. If we are to defer
3549 actually looking up the actual type, make an entry in the
3550 deferred list. If this is from a limited with, we have to defer
3551 to the end of the current spec in two cases: first if the
3552 designated type is in the current unit and second if the access
3554 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3557 = TYPE_FAT_POINTER_P (gnu_type)
3558 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3560 if (esize == POINTER_SIZE
3561 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3563 = build_pointer_type
3564 (TYPE_OBJECT_RECORD_TYPE
3565 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3567 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3568 !Comes_From_Source (gnat_entity),
3569 debug_info_p, gnat_entity);
3570 this_made_decl = true;
3571 gnu_type = TREE_TYPE (gnu_decl);
3572 save_gnu_tree (gnat_entity, gnu_decl, false);
3575 if (defer_incomplete_level == 0
3576 && ! (is_from_limited_with
3578 || In_Extended_Main_Code_Unit (gnat_entity))))
3579 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3580 gnat_to_gnu_type (gnat_desig_equiv));
3582 /* Note that the call to gnat_to_gnu_type here might have
3583 updated gnu_old_type directly, in which case it is not a
3584 dummy type any more when we get into update_pointer_to.
3586 This may happen for instance when the designated type is a
3587 record type, because their elaboration starts with an
3588 initial node from make_dummy_type, which may yield the same
3589 node as the one we got.
3591 Besides, variants of this non-dummy type might have been
3592 created along the way. update_pointer_to is expected to
3593 properly take care of those situations. */
3596 struct incomplete *p
3597 = (struct incomplete *) xmalloc (sizeof
3598 (struct incomplete));
3599 struct incomplete **head
3600 = (is_from_limited_with
3602 || In_Extended_Main_Code_Unit (gnat_entity))
3603 ? &defer_limited_with : &defer_incomplete_list);
3605 p->old_type = gnu_old_type;
3606 p->full_type = gnat_desig_equiv;
3614 case E_Access_Protected_Subprogram_Type:
3615 case E_Anonymous_Access_Protected_Subprogram_Type:
3616 if (type_annotate_only && No (gnat_equiv_type))
3617 gnu_type = ptr_void_type_node;
3620 /* The runtime representation is the equivalent type. */
3621 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3622 maybe_present = true;
3625 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3626 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3627 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3628 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3629 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3634 case E_Access_Subtype:
3636 /* We treat this as identical to its base type; any constraint is
3637 meaningful only to the front end.
3639 The designated type must be elaborated as well, if it does
3640 not have its own freeze node. Designated (sub)types created
3641 for constrained components of records with discriminants are
3642 not frozen by the front end and thus not elaborated by gigi,
3643 because their use may appear before the base type is frozen,
3644 and because it is not clear that they are needed anywhere in
3645 Gigi. With the current model, there is no correct place where
3646 they could be elaborated. */
3648 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3649 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3650 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3651 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3652 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3654 /* If we are not defining this entity, and we have incomplete
3655 entities being processed above us, make a dummy type and
3656 elaborate it later. */
3657 if (!definition && defer_incomplete_level != 0)
3659 struct incomplete *p
3660 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3662 = build_pointer_type
3663 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3665 p->old_type = TREE_TYPE (gnu_ptr_type);
3666 p->full_type = Directly_Designated_Type (gnat_entity);
3667 p->next = defer_incomplete_list;
3668 defer_incomplete_list = p;
3670 else if (!IN (Ekind (Base_Type
3671 (Directly_Designated_Type (gnat_entity))),
3672 Incomplete_Or_Private_Kind))
3673 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3677 maybe_present = true;
3680 /* Subprogram Entities
3682 The following access functions are defined for subprograms (functions
3685 First_Formal The first formal parameter.
3686 Is_Imported Indicates that the subprogram has appeared in
3687 an INTERFACE or IMPORT pragma. For now we
3688 assume that the external language is C.
3689 Is_Exported Likewise but for an EXPORT pragma.
3690 Is_Inlined True if the subprogram is to be inlined.
3692 In addition for function subprograms we have:
3694 Etype Return type of the function.
3696 Each parameter is first checked by calling must_pass_by_ref on its
3697 type to determine if it is passed by reference. For parameters which
3698 are copied in, if they are Ada In Out or Out parameters, their return
3699 value becomes part of a record which becomes the return type of the
3700 function (C function - note that this applies only to Ada procedures
3701 so there is no Ada return type). Additional code to store back the
3702 parameters will be generated on the caller side. This transformation
3703 is done here, not in the front-end.
3705 The intended result of the transformation can be seen from the
3706 equivalent source rewritings that follow:
3708 struct temp {int a,b};
3709 procedure P (A,B: In Out ...) is temp P (int A,B)
3712 end P; return {A,B};
3719 For subprogram types we need to perform mainly the same conversions to
3720 GCC form that are needed for procedures and function declarations. The
3721 only difference is that at the end, we make a type declaration instead
3722 of a function declaration. */
3724 case E_Subprogram_Type:
3728 /* The first GCC parameter declaration (a PARM_DECL node). The
3729 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3730 actually is the head of this parameter list. */
3731 tree gnu_param_list = NULL_TREE;
3732 /* Likewise for the stub associated with an exported procedure. */
3733 tree gnu_stub_param_list = NULL_TREE;
3734 /* The type returned by a function. If the subprogram is a procedure
3735 this type should be void_type_node. */
3736 tree gnu_return_type = void_type_node;
3737 /* List of fields in return type of procedure with copy-in copy-out
3739 tree gnu_field_list = NULL_TREE;
3740 /* Non-null for subprograms containing parameters passed by copy-in
3741 copy-out (Ada In Out or Out parameters not passed by reference),
3742 in which case it is the list of nodes used to specify the values of
3743 the in out/out parameters that are returned as a record upon
3744 procedure return. The TREE_PURPOSE of an element of this list is
3745 a field of the record and the TREE_VALUE is the PARM_DECL
3746 corresponding to that field. This list will be saved in the
3747 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3748 tree gnu_return_list = NULL_TREE;
3749 /* If an import pragma asks to map this subprogram to a GCC builtin,
3750 this is the builtin DECL node. */
3751 tree gnu_builtin_decl = NULL_TREE;
3752 /* For the stub associated with an exported procedure. */
3753 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3754 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3755 Entity_Id gnat_param;
3756 bool inline_flag = Is_Inlined (gnat_entity);
3757 bool public_flag = Is_Public (gnat_entity) || imported_p;
3759 = (Is_Public (gnat_entity) && !definition) || imported_p;
3761 /* The semantics of "pure" in Ada essentially matches that of "const"
3762 in the back-end. In particular, both properties are orthogonal to
3763 the "nothrow" property if the EH circuitry is explicit in the
3764 internal representation of the back-end. If we are to completely
3765 hide the EH circuitry from it, we need to declare that calls to pure
3766 Ada subprograms that can throw have side effects since they can
3767 trigger an "abnormal" transfer of control flow; thus they can be
3768 neither "const" nor "pure" in the back-end sense. */
3770 = (Exception_Mechanism == Back_End_Exceptions
3771 && Is_Pure (gnat_entity));
3773 bool volatile_flag = No_Return (gnat_entity);
3774 bool returns_by_ref = false;
3775 bool returns_unconstrained = false;
3776 bool returns_by_target_ptr = false;
3777 bool has_copy_in_out = false;
3778 bool has_stub = false;
3781 if (kind == E_Subprogram_Type && !definition)
3782 /* A parameter may refer to this type, so defer completion
3783 of any incomplete types. */
3784 defer_incomplete_level++, this_deferred = true;
3786 /* If the subprogram has an alias, it is probably inherited, so
3787 we can use the original one. If the original "subprogram"
3788 is actually an enumeration literal, it may be the first use
3789 of its type, so we must elaborate that type now. */
3790 if (Present (Alias (gnat_entity)))
3792 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3793 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3795 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3798 /* Elaborate any Itypes in the parameters of this entity. */
3799 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3800 Present (gnat_temp);
3801 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3802 if (Is_Itype (Etype (gnat_temp)))
3803 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3808 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3809 corresponding DECL node.
3811 We still want the parameter associations to take place because the
3812 proper generation of calls depends on it (a GNAT parameter without
3813 a corresponding GCC tree has a very specific meaning), so we don't
3815 if (Convention (gnat_entity) == Convention_Intrinsic)
3816 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3818 /* ??? What if we don't find the builtin node above ? warn ? err ?
3819 In the current state we neither warn nor err, and calls will just
3820 be handled as for regular subprograms. */
3822 if (kind == E_Function || kind == E_Subprogram_Type)
3823 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3825 /* If this function returns by reference, make the actual
3826 return type of this function the pointer and mark the decl. */
3827 if (Returns_By_Ref (gnat_entity))
3829 returns_by_ref = true;
3830 gnu_return_type = build_pointer_type (gnu_return_type);
3833 /* If the Mechanism is By_Reference, ensure the return type uses
3834 the machine's by-reference mechanism, which may not the same
3835 as above (e.g., it might be by passing a fake parameter). */
3836 else if (kind == E_Function
3837 && Mechanism (gnat_entity) == By_Reference)
3839 TREE_ADDRESSABLE (gnu_return_type) = 1;
3841 /* We expect this bit to be reset by gigi shortly, so can avoid a
3842 type node copy here. This actually also prevents troubles with
3843 the generation of debug information for the function, because
3844 we might have issued such info for this type already, and would
3845 be attaching a distinct type node to the function if we made a
3849 /* If we are supposed to return an unconstrained array,
3850 actually return a fat pointer and make a note of that. Return
3851 a pointer to an unconstrained record of variable size. */
3852 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3854 gnu_return_type = TREE_TYPE (gnu_return_type);
3855 returns_unconstrained = true;
3858 /* If the type requires a transient scope, the result is allocated
3859 on the secondary stack, so the result type of the function is
3861 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3863 gnu_return_type = build_pointer_type (gnu_return_type);
3864 returns_unconstrained = true;
3867 /* If the type is a padded type and the underlying type would not
3868 be passed by reference or this function has a foreign convention,
3869 return the underlying type. */
3870 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3871 && TYPE_IS_PADDING_P (gnu_return_type)
3872 && (!default_pass_by_ref (TREE_TYPE
3873 (TYPE_FIELDS (gnu_return_type)))
3874 || Has_Foreign_Convention (gnat_entity)))
3875 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3877 /* If the return type has a non-constant size, we convert the function
3878 into a procedure and its caller will pass a pointer to an object as
3879 the first parameter when we call the function. This can happen for
3880 an unconstrained type with a maximum size or a constrained type with
3881 a size not known at compile time. */
3882 if (TYPE_SIZE_UNIT (gnu_return_type)
3883 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
3885 returns_by_target_ptr = true;
3887 = create_param_decl (get_identifier ("TARGET"),
3888 build_reference_type (gnu_return_type),
3890 gnu_return_type = void_type_node;
3893 /* If the return type has a size that overflows, we cannot have
3894 a function that returns that type. This usage doesn't make
3895 sense anyway, so give an error here. */
3896 if (TYPE_SIZE_UNIT (gnu_return_type)
3897 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3898 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3900 post_error ("cannot return type whose size overflows",
3902 gnu_return_type = copy_node (gnu_return_type);
3903 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3904 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3905 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3906 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3909 /* Look at all our parameters and get the type of
3910 each. While doing this, build a copy-out structure if
3913 /* Loop over the parameters and get their associated GCC tree.
3914 While doing this, build a copy-out structure if we need one. */
3915 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
3916 Present (gnat_param);
3917 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3919 tree gnu_param_name = get_entity_name (gnat_param);
3920 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3921 tree gnu_param, gnu_field;
3922 bool copy_in_copy_out = false;
3923 Mechanism_Type mech = Mechanism (gnat_param);
3925 /* Builtins are expanded inline and there is no real call sequence
3926 involved. So the type expected by the underlying expander is
3927 always the type of each argument "as is". */
3928 if (gnu_builtin_decl)
3930 /* Handle the first parameter of a valued procedure specially. */
3931 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3932 mech = By_Copy_Return;
3933 /* Otherwise, see if a Mechanism was supplied that forced this
3934 parameter to be passed one way or another. */
3935 else if (mech == Default
3936 || mech == By_Copy || mech == By_Reference)
3938 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
3939 mech = By_Descriptor;
3941 else if (By_Short_Descriptor_Last <= mech &&
3942 mech <= By_Short_Descriptor)
3943 mech = By_Short_Descriptor;
3947 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
3948 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
3949 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
3951 mech = By_Reference;
3957 post_error ("unsupported mechanism for&", gnat_param);
3962 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
3963 Has_Foreign_Convention (gnat_entity),
3966 /* We are returned either a PARM_DECL or a type if no parameter
3967 needs to be passed; in either case, adjust the type. */
3968 if (DECL_P (gnu_param))
3969 gnu_param_type = TREE_TYPE (gnu_param);
3972 gnu_param_type = gnu_param;
3973 gnu_param = NULL_TREE;
3978 /* If it's an exported subprogram, we build a parameter list
3979 in parallel, in case we need to emit a stub for it. */
3980 if (Is_Exported (gnat_entity))
3983 = chainon (gnu_param, gnu_stub_param_list);
3984 /* Change By_Descriptor parameter to By_Reference for
3985 the internal version of an exported subprogram. */
3986 if (mech == By_Descriptor || mech == By_Short_Descriptor)
3989 = gnat_to_gnu_param (gnat_param, By_Reference,
3995 gnu_param = copy_node (gnu_param);
3998 gnu_param_list = chainon (gnu_param, gnu_param_list);
3999 Sloc_to_locus (Sloc (gnat_param),
4000 &DECL_SOURCE_LOCATION (gnu_param));
4001 save_gnu_tree (gnat_param, gnu_param, false);
4003 /* If a parameter is a pointer, this function may modify
4004 memory through it and thus shouldn't be considered
4005 a const function. Also, the memory may be modified
4006 between two calls, so they can't be CSE'ed. The latter
4007 case also handles by-ref parameters. */
4008 if (POINTER_TYPE_P (gnu_param_type)
4009 || TYPE_FAT_POINTER_P (gnu_param_type))
4013 if (copy_in_copy_out)
4015 if (!has_copy_in_out)
4017 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4018 gnu_return_type = make_node (RECORD_TYPE);
4019 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4020 has_copy_in_out = true;
4023 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4024 gnu_return_type, 0, 0, 0, 0);
4025 Sloc_to_locus (Sloc (gnat_param),
4026 &DECL_SOURCE_LOCATION (gnu_field));
4027 TREE_CHAIN (gnu_field) = gnu_field_list;
4028 gnu_field_list = gnu_field;
4029 gnu_return_list = tree_cons (gnu_field, gnu_param,
4034 /* Do not compute record for out parameters if subprogram is
4035 stubbed since structures are incomplete for the back-end. */
4036 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4037 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4040 /* If we have a CICO list but it has only one entry, we convert
4041 this function into a function that simply returns that one
4043 if (list_length (gnu_return_list) == 1)
4044 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
4046 if (Has_Stdcall_Convention (gnat_entity))
4047 prepend_one_attribute_to
4048 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4049 get_identifier ("stdcall"), NULL_TREE,
4052 /* If we are on a target where stack realignment is needed for 'main'
4053 to honor GCC's implicit expectations (stack alignment greater than
4054 what the base ABI guarantees), ensure we do the same for foreign
4055 convention subprograms as they might be used as callbacks from code
4056 breaking such expectations. Note that this applies to task entry
4057 points in particular. */
4058 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4059 && Has_Foreign_Convention (gnat_entity))
4060 prepend_one_attribute_to
4061 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4062 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4065 /* The lists have been built in reverse. */
4066 gnu_param_list = nreverse (gnu_param_list);
4068 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4069 gnu_return_list = nreverse (gnu_return_list);
4071 if (Ekind (gnat_entity) == E_Function)
4072 Set_Mechanism (gnat_entity,
4073 (returns_by_ref || returns_unconstrained
4074 ? By_Reference : By_Copy));
4076 = create_subprog_type (gnu_return_type, gnu_param_list,
4077 gnu_return_list, returns_unconstrained,
4078 returns_by_ref, returns_by_target_ptr);
4082 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4083 gnu_return_list, returns_unconstrained,
4084 returns_by_ref, returns_by_target_ptr);
4086 /* A subprogram (something that doesn't return anything) shouldn't
4087 be considered const since there would be no reason for such a
4088 subprogram. Note that procedures with Out (or In Out) parameters
4089 have already been converted into a function with a return type. */
4090 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4094 = build_qualified_type (gnu_type,
4095 TYPE_QUALS (gnu_type)
4096 | (TYPE_QUAL_CONST * const_flag)
4097 | (TYPE_QUAL_VOLATILE * volatile_flag));
4099 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4103 = build_qualified_type (gnu_stub_type,
4104 TYPE_QUALS (gnu_stub_type)
4105 | (TYPE_QUAL_CONST * const_flag)
4106 | (TYPE_QUAL_VOLATILE * volatile_flag));
4108 /* If we have a builtin decl for that function, check the signatures
4109 compatibilities. If the signatures are compatible, use the builtin
4110 decl. If they are not, we expect the checker predicate to have
4111 posted the appropriate errors, and just continue with what we have
4113 if (gnu_builtin_decl)
4115 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4117 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4119 gnu_decl = gnu_builtin_decl;
4120 gnu_type = gnu_builtin_type;
4125 /* If there was no specified Interface_Name and the external and
4126 internal names of the subprogram are the same, only use the
4127 internal name to allow disambiguation of nested subprograms. */
4128 if (No (Interface_Name (gnat_entity))
4129 && gnu_ext_name == gnu_entity_name)
4130 gnu_ext_name = NULL_TREE;
4132 /* If we are defining the subprogram and it has an Address clause
4133 we must get the address expression from the saved GCC tree for the
4134 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4135 the address expression here since the front-end has guaranteed
4136 in that case that the elaboration has no effects. If there is
4137 an Address clause and we are not defining the object, just
4138 make it a constant. */
4139 if (Present (Address_Clause (gnat_entity)))
4141 tree gnu_address = NULL_TREE;
4145 = (present_gnu_tree (gnat_entity)
4146 ? get_gnu_tree (gnat_entity)
4147 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4149 save_gnu_tree (gnat_entity, NULL_TREE, false);
4151 /* Convert the type of the object to a reference type that can
4152 alias everything as per 13.3(19). */
4154 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4156 gnu_address = convert (gnu_type, gnu_address);
4159 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4160 gnu_address, false, Is_Public (gnat_entity),
4161 extern_flag, false, NULL, gnat_entity);
4162 DECL_BY_REF_P (gnu_decl) = 1;
4165 else if (kind == E_Subprogram_Type)
4166 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4167 !Comes_From_Source (gnat_entity),
4168 debug_info_p, gnat_entity);
4173 gnu_stub_name = gnu_ext_name;
4174 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4175 public_flag = false;
4178 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4179 gnu_type, gnu_param_list,
4180 inline_flag, public_flag,
4181 extern_flag, attr_list,
4186 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4187 gnu_stub_type, gnu_stub_param_list,
4189 extern_flag, attr_list,
4191 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4194 /* This is unrelated to the stub built right above. */
4195 DECL_STUBBED_P (gnu_decl)
4196 = Convention (gnat_entity) == Convention_Stubbed;
4201 case E_Incomplete_Type:
4202 case E_Incomplete_Subtype:
4203 case E_Private_Type:
4204 case E_Private_Subtype:
4205 case E_Limited_Private_Type:
4206 case E_Limited_Private_Subtype:
4207 case E_Record_Type_With_Private:
4208 case E_Record_Subtype_With_Private:
4210 /* Get the "full view" of this entity. If this is an incomplete
4211 entity from a limited with, treat its non-limited view as the
4212 full view. Otherwise, use either the full view or the underlying
4213 full view, whichever is present. This is used in all the tests
4216 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4217 && From_With_Type (gnat_entity))
4218 ? Non_Limited_View (gnat_entity)
4219 : Present (Full_View (gnat_entity))
4220 ? Full_View (gnat_entity)
4221 : Underlying_Full_View (gnat_entity);
4223 /* If this is an incomplete type with no full view, it must be a Taft
4224 Amendment type, in which case we return a dummy type. Otherwise,
4225 just get the type from its Etype. */
4228 if (kind == E_Incomplete_Type)
4230 gnu_type = make_dummy_type (gnat_entity);
4231 gnu_decl = TYPE_STUB_DECL (gnu_type);
4235 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4237 maybe_present = true;
4242 /* If we already made a type for the full view, reuse it. */
4243 else if (present_gnu_tree (full_view))
4245 gnu_decl = get_gnu_tree (full_view);
4249 /* Otherwise, if we are not defining the type now, get the type
4250 from the full view. But always get the type from the full view
4251 for define on use types, since otherwise we won't see them! */
4252 else if (!definition
4253 || (Is_Itype (full_view)
4254 && No (Freeze_Node (gnat_entity)))
4255 || (Is_Itype (gnat_entity)
4256 && No (Freeze_Node (full_view))))
4258 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4259 maybe_present = true;
4263 /* For incomplete types, make a dummy type entry which will be
4264 replaced later. Save it as the full declaration's type so
4265 we can do any needed updates when we see it. */
4266 gnu_type = make_dummy_type (gnat_entity);
4267 gnu_decl = TYPE_STUB_DECL (gnu_type);
4268 save_gnu_tree (full_view, gnu_decl, 0);
4272 /* Simple class_wide types are always viewed as their root_type
4273 by Gigi unless an Equivalent_Type is specified. */
4274 case E_Class_Wide_Type:
4275 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4276 maybe_present = true;
4280 case E_Task_Subtype:
4281 case E_Protected_Type:
4282 case E_Protected_Subtype:
4283 if (type_annotate_only && No (gnat_equiv_type))
4284 gnu_type = void_type_node;
4286 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4288 maybe_present = true;
4292 gnu_decl = create_label_decl (gnu_entity_name);
4297 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4298 we've already saved it, so we don't try to. */
4299 gnu_decl = error_mark_node;
4307 /* If we had a case where we evaluated another type and it might have
4308 defined this one, handle it here. */
4309 if (maybe_present && present_gnu_tree (gnat_entity))
4311 gnu_decl = get_gnu_tree (gnat_entity);
4315 /* If we are processing a type and there is either no decl for it or
4316 we just made one, do some common processing for the type, such as
4317 handling alignment and possible padding. */
4318 if (is_type && (!gnu_decl || this_made_decl))
4320 if (Is_Tagged_Type (gnat_entity)
4321 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4322 TYPE_ALIGN_OK (gnu_type) = 1;
4324 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4325 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4327 /* ??? Don't set the size for a String_Literal since it is either
4328 confirming or we don't handle it properly (if the low bound is
4330 if (!gnu_size && kind != E_String_Literal_Subtype)
4331 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4333 Has_Size_Clause (gnat_entity));
4335 /* If a size was specified, see if we can make a new type of that size
4336 by rearranging the type, for example from a fat to a thin pointer. */
4340 = make_type_from_size (gnu_type, gnu_size,
4341 Has_Biased_Representation (gnat_entity));
4343 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4344 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4348 /* If the alignment hasn't already been processed and this is
4349 not an unconstrained array, see if an alignment is specified.
4350 If not, we pick a default alignment for atomic objects. */
4351 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4353 else if (Known_Alignment (gnat_entity))
4355 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4356 TYPE_ALIGN (gnu_type));
4358 /* Warn on suspiciously large alignments. This should catch
4359 errors about the (alignment,byte)/(size,bit) discrepancy. */
4360 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4364 /* If a size was specified, take it into account. Otherwise
4365 use the RM size for records as the type size has already
4366 been adjusted to the alignment. */
4369 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4370 || TREE_CODE (gnu_type) == UNION_TYPE
4371 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4372 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4373 size = rm_size (gnu_type);
4375 size = TYPE_SIZE (gnu_type);
4377 /* Consider an alignment as suspicious if the alignment/size
4378 ratio is greater or equal to the byte/bit ratio. */
4379 if (host_integerp (size, 1)
4380 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4381 post_error_ne ("?suspiciously large alignment specified for&",
4382 Expression (Alignment_Clause (gnat_entity)),
4386 else if (Is_Atomic (gnat_entity) && !gnu_size
4387 && host_integerp (TYPE_SIZE (gnu_type), 1)
4388 && integer_pow2p (TYPE_SIZE (gnu_type)))
4389 align = MIN (BIGGEST_ALIGNMENT,
4390 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4391 else if (Is_Atomic (gnat_entity) && gnu_size
4392 && host_integerp (gnu_size, 1)
4393 && integer_pow2p (gnu_size))
4394 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4396 /* See if we need to pad the type. If we did, and made a record,
4397 the name of the new type may be changed. So get it back for
4398 us when we make the new TYPE_DECL below. */
4399 if (gnu_size || align > 0)
4400 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4401 "PAD", true, definition, false);
4403 if (TREE_CODE (gnu_type) == RECORD_TYPE
4404 && TYPE_IS_PADDING_P (gnu_type))
4406 gnu_entity_name = TYPE_NAME (gnu_type);
4407 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4408 gnu_entity_name = DECL_NAME (gnu_entity_name);
4411 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4413 /* If we are at global level, GCC will have applied variable_size to
4414 the type, but that won't have done anything. So, if it's not
4415 a constant or self-referential, call elaborate_expression_1 to
4416 make a variable for the size rather than calculating it each time.
4417 Handle both the RM size and the actual size. */
4418 if (global_bindings_p ()
4419 && TYPE_SIZE (gnu_type)
4420 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4421 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4423 if (TREE_CODE (gnu_type) == RECORD_TYPE
4424 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4425 TYPE_SIZE (gnu_type), 0))
4427 TYPE_SIZE (gnu_type)
4428 = elaborate_expression_1 (gnat_entity, gnat_entity,
4429 TYPE_SIZE (gnu_type),
4430 get_identifier ("SIZE"),
4432 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4436 TYPE_SIZE (gnu_type)
4437 = elaborate_expression_1 (gnat_entity, gnat_entity,
4438 TYPE_SIZE (gnu_type),
4439 get_identifier ("SIZE"),
4442 /* ??? For now, store the size as a multiple of the alignment
4443 in bytes so that we can see the alignment from the tree. */
4444 TYPE_SIZE_UNIT (gnu_type)
4446 (MULT_EXPR, sizetype,
4447 elaborate_expression_1
4448 (gnat_entity, gnat_entity,
4449 build_binary_op (EXACT_DIV_EXPR, sizetype,
4450 TYPE_SIZE_UNIT (gnu_type),
4451 size_int (TYPE_ALIGN (gnu_type)
4453 get_identifier ("SIZE_A_UNIT"),
4455 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4457 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4460 elaborate_expression_1 (gnat_entity,
4462 TYPE_ADA_SIZE (gnu_type),
4463 get_identifier ("RM_SIZE"),
4468 /* If this is a record type or subtype, call elaborate_expression_1 on
4469 any field position. Do this for both global and local types.
4470 Skip any fields that we haven't made trees for to avoid problems with
4471 class wide types. */
4472 if (IN (kind, Record_Kind))
4473 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4474 gnat_temp = Next_Entity (gnat_temp))
4475 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4477 tree gnu_field = get_gnu_tree (gnat_temp);
4479 /* ??? Unfortunately, GCC needs to be able to prove the
4480 alignment of this offset and if it's a variable, it can't.
4481 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4482 right now, we have to put in an explicit multiply and
4483 divide by that value. */
4484 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4486 DECL_FIELD_OFFSET (gnu_field)
4488 (MULT_EXPR, sizetype,
4489 elaborate_expression_1
4490 (gnat_temp, gnat_temp,
4491 build_binary_op (EXACT_DIV_EXPR, sizetype,
4492 DECL_FIELD_OFFSET (gnu_field),
4493 size_int (DECL_OFFSET_ALIGN (gnu_field)
4495 get_identifier ("OFFSET"),
4497 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4499 /* ??? The context of gnu_field is not necessarily gnu_type so
4500 the MULT_EXPR node built above may not be marked by the call
4501 to create_type_decl below. */
4502 if (global_bindings_p ())
4503 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4507 gnu_type = build_qualified_type (gnu_type,
4508 (TYPE_QUALS (gnu_type)
4509 | (TYPE_QUAL_VOLATILE
4510 * Treat_As_Volatile (gnat_entity))));
4512 if (Is_Atomic (gnat_entity))
4513 check_ok_for_atomic (gnu_type, gnat_entity, false);
4515 if (Present (Alignment_Clause (gnat_entity)))
4516 TYPE_USER_ALIGN (gnu_type) = 1;
4518 if (Universal_Aliasing (gnat_entity))
4519 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4522 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4523 !Comes_From_Source (gnat_entity),
4524 debug_info_p, gnat_entity);
4526 TREE_TYPE (gnu_decl) = gnu_type;
4529 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4531 gnu_type = TREE_TYPE (gnu_decl);
4533 /* If this is a derived type, relate its alias set to that of its parent
4534 to avoid troubles when a call to an inherited primitive is inlined in
4535 a context where a derived object is accessed. The inlined code works
4536 on the parent view so the resulting code may access the same object
4537 using both the parent and the derived alias sets, which thus have to
4538 conflict. As the same issue arises with component references, the
4539 parent alias set also has to conflict with composite types enclosing
4540 derived components. For instance, if we have:
4547 we want T to conflict with both D and R, in addition to R being a
4548 superset of D by record/component construction.
4550 One way to achieve this is to perform an alias set copy from the
4551 parent to the derived type. This is not quite appropriate, though,
4552 as we don't want separate derived types to conflict with each other:
4554 type I1 is new Integer;
4555 type I2 is new Integer;
4557 We want I1 and I2 to both conflict with Integer but we do not want
4558 I1 to conflict with I2, and an alias set copy on derivation would
4561 The option chosen is to make the alias set of the derived type a
4562 superset of that of its parent type. It trivially fulfills the
4563 simple requirement for the Integer derivation example above, and
4564 the component case as well by superset transitivity:
4567 R ----------> D ----------> T
4569 The language rules ensure the parent type is already frozen here. */
4570 if (Is_Derived_Type (gnat_entity))
4572 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4573 relate_alias_sets (gnu_type, gnu_parent_type, ALIAS_SET_SUPERSET);
4576 /* Back-annotate the Alignment of the type if not already in the
4577 tree. Likewise for sizes. */
4578 if (Unknown_Alignment (gnat_entity))
4579 Set_Alignment (gnat_entity,
4580 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4582 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4584 /* If the size is self-referential, we annotate the maximum
4585 value of that size. */
4586 tree gnu_size = TYPE_SIZE (gnu_type);
4588 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4589 gnu_size = max_size (gnu_size, true);
4591 Set_Esize (gnat_entity, annotate_value (gnu_size));
4593 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4595 /* In this mode the tag and the parent components are not
4596 generated by the front-end, so the sizes must be adjusted
4598 int size_offset, new_size;
4600 if (Is_Derived_Type (gnat_entity))
4603 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4604 Set_Alignment (gnat_entity,
4605 Alignment (Etype (Base_Type (gnat_entity))));
4608 size_offset = POINTER_SIZE;
4610 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4611 Set_Esize (gnat_entity,
4612 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4613 / POINTER_SIZE) * POINTER_SIZE));
4614 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4618 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4619 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4622 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4623 DECL_ARTIFICIAL (gnu_decl) = 1;
4625 if (!debug_info_p && DECL_P (gnu_decl)
4626 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4627 && No (Renamed_Object (gnat_entity)))
4628 DECL_IGNORED_P (gnu_decl) = 1;
4630 /* If we haven't already, associate the ..._DECL node that we just made with
4631 the input GNAT entity node. */
4633 save_gnu_tree (gnat_entity, gnu_decl, false);
4635 /* If this is an enumeral or floating-point type, we were not able to set
4636 the bounds since they refer to the type. These bounds are always static.
4637 For enumeration types, also write debugging information and declare the
4638 enumeration literal table, if needed. */
4639 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4640 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4642 tree gnu_scalar_type = gnu_type;
4644 /* If this is a padded type, we need to use the underlying type. */
4645 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4646 && TYPE_IS_PADDING_P (gnu_scalar_type))
4647 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4649 /* If this is a floating point type and we haven't set a floating
4650 point type yet, use this in the evaluation of the bounds. */
4651 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4652 longest_float_type_node = gnu_type;
4654 TYPE_MIN_VALUE (gnu_scalar_type)
4655 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4656 TYPE_MAX_VALUE (gnu_scalar_type)
4657 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4659 if (TREE_CODE (gnu_scalar_type) == ENUMERAL_TYPE)
4661 /* Since this has both a typedef and a tag, avoid outputting
4663 DECL_ARTIFICIAL (gnu_decl) = 1;
4664 rest_of_type_decl_compilation (gnu_decl);
4668 /* If we deferred processing of incomplete types, re-enable it. If there
4669 were no other disables and we have some to process, do so. */
4670 if (this_deferred && --defer_incomplete_level == 0)
4672 if (defer_incomplete_list)
4674 struct incomplete *incp, *next;
4676 /* We are back to level 0 for the deferring of incomplete types.
4677 But processing these incomplete types below may itself require
4678 deferring, so preserve what we have and restart from scratch. */
4679 incp = defer_incomplete_list;
4680 defer_incomplete_list = NULL;
4682 /* For finalization, however, all types must be complete so we
4683 cannot do the same because deferred incomplete types may end up
4684 referencing each other. Process them all recursively first. */
4685 defer_finalize_level++;
4687 for (; incp; incp = next)
4692 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4693 gnat_to_gnu_type (incp->full_type));
4697 defer_finalize_level--;
4700 /* All the deferred incomplete types have been processed so we can
4701 now proceed with the finalization of the deferred types. */
4702 if (defer_finalize_level == 0 && defer_finalize_list)
4707 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4708 rest_of_type_decl_compilation_no_defer (t);
4710 VEC_free (tree, heap, defer_finalize_list);
4714 /* If we are not defining this type, see if it's in the incomplete list.
4715 If so, handle that list entry now. */
4716 else if (!definition)
4718 struct incomplete *incp;
4720 for (incp = defer_incomplete_list; incp; incp = incp->next)
4721 if (incp->old_type && incp->full_type == gnat_entity)
4723 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4724 TREE_TYPE (gnu_decl));
4725 incp->old_type = NULL_TREE;
4732 /* If this is a packed array type whose original array type is itself
4733 an Itype without freeze node, make sure the latter is processed. */
4734 if (Is_Packed_Array_Type (gnat_entity)
4735 && Is_Itype (Original_Array_Type (gnat_entity))
4736 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4737 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4738 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4743 /* Similar, but if the returned value is a COMPONENT_REF, return the
4747 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4749 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4751 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4752 gnu_field = TREE_OPERAND (gnu_field, 1);
4757 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4758 the GCC type corresponding to that entity. */
4761 gnat_to_gnu_type (Entity_Id gnat_entity)
4765 /* The back end never attempts to annotate generic types. */
4766 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4767 return void_type_node;
4769 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4770 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4772 return TREE_TYPE (gnu_decl);
4775 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4776 the unpadded version of the GCC type corresponding to that entity. */
4779 get_unpadded_type (Entity_Id gnat_entity)
4781 tree type = gnat_to_gnu_type (gnat_entity);
4783 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4784 type = TREE_TYPE (TYPE_FIELDS (type));
4789 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4790 Every TYPE_DECL generated for a type definition must be passed
4791 to this function once everything else has been done for it. */
4794 rest_of_type_decl_compilation (tree decl)
4796 /* We need to defer finalizing the type if incomplete types
4797 are being deferred or if they are being processed. */
4798 if (defer_incomplete_level || defer_finalize_level)
4799 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4801 rest_of_type_decl_compilation_no_defer (decl);
4804 /* Same as above but without deferring the compilation. This
4805 function should not be invoked directly on a TYPE_DECL. */
4808 rest_of_type_decl_compilation_no_defer (tree decl)
4810 const int toplev = global_bindings_p ();
4811 tree t = TREE_TYPE (decl);
4813 rest_of_decl_compilation (decl, toplev, 0);
4815 /* Now process all the variants. This is needed for STABS. */
4816 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4818 if (t == TREE_TYPE (decl))
4821 if (!TYPE_STUB_DECL (t))
4822 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4824 rest_of_type_compilation (t, toplev);
4828 /* Finalize any From_With_Type incomplete types. We do this after processing
4829 our compilation unit and after processing its spec, if this is a body. */
4832 finalize_from_with_types (void)
4834 struct incomplete *incp = defer_limited_with;
4835 struct incomplete *next;
4837 defer_limited_with = 0;
4838 for (; incp; incp = next)
4842 if (incp->old_type != 0)
4843 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4844 gnat_to_gnu_type (incp->full_type));
4849 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4850 kind of type (such E_Task_Type) that has a different type which Gigi
4851 uses for its representation. If the type does not have a special type
4852 for its representation, return GNAT_ENTITY. If a type is supposed to
4853 exist, but does not, abort unless annotating types, in which case
4854 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4857 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4859 Entity_Id gnat_equiv = gnat_entity;
4861 if (No (gnat_entity))
4864 switch (Ekind (gnat_entity))
4866 case E_Class_Wide_Subtype:
4867 if (Present (Equivalent_Type (gnat_entity)))
4868 gnat_equiv = Equivalent_Type (gnat_entity);
4871 case E_Access_Protected_Subprogram_Type:
4872 case E_Anonymous_Access_Protected_Subprogram_Type:
4873 gnat_equiv = Equivalent_Type (gnat_entity);
4876 case E_Class_Wide_Type:
4877 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
4878 ? Equivalent_Type (gnat_entity)
4879 : Root_Type (gnat_entity));
4883 case E_Task_Subtype:
4884 case E_Protected_Type:
4885 case E_Protected_Subtype:
4886 gnat_equiv = Corresponding_Record_Type (gnat_entity);
4893 gcc_assert (Present (gnat_equiv) || type_annotate_only);
4897 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
4898 using MECH as its passing mechanism, to be placed in the parameter
4899 list built for GNAT_SUBPROG. Assume a foreign convention for the
4900 latter if FOREIGN is true. Also set CICO to true if the parameter
4901 must use the copy-in copy-out implementation mechanism.
4903 The returned tree is a PARM_DECL, except for those cases where no
4904 parameter needs to be actually passed to the subprogram; the type
4905 of this "shadow" parameter is then returned instead. */
4908 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
4909 Entity_Id gnat_subprog, bool foreign, bool *cico)
4911 tree gnu_param_name = get_entity_name (gnat_param);
4912 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4913 tree gnu_param_type_alt = NULL_TREE;
4914 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
4915 /* The parameter can be indirectly modified if its address is taken. */
4916 bool ro_param = in_param && !Address_Taken (gnat_param);
4917 bool by_return = false, by_component_ptr = false, by_ref = false;
4920 /* Copy-return is used only for the first parameter of a valued procedure.
4921 It's a copy mechanism for which a parameter is never allocated. */
4922 if (mech == By_Copy_Return)
4924 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
4929 /* If this is either a foreign function or if the underlying type won't
4930 be passed by reference, strip off possible padding type. */
4931 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
4932 && TYPE_IS_PADDING_P (gnu_param_type))
4934 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
4936 if (mech == By_Reference
4938 || (!must_pass_by_ref (unpadded_type)
4939 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
4940 gnu_param_type = unpadded_type;
4943 /* If this is a read-only parameter, make a variant of the type that is
4944 read-only. ??? However, if this is an unconstrained array, that type
4945 can be very complex, so skip it for now. Likewise for any other
4946 self-referential type. */
4948 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
4949 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
4950 gnu_param_type = build_qualified_type (gnu_param_type,
4951 (TYPE_QUALS (gnu_param_type)
4952 | TYPE_QUAL_CONST));
4954 /* For foreign conventions, pass arrays as pointers to the element type.
4955 First check for unconstrained array and get the underlying array. */
4956 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
4958 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
4960 /* VMS descriptors are themselves passed by reference. */
4961 if (mech == By_Short_Descriptor ||
4962 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
4964 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
4965 Mechanism (gnat_param),
4967 else if (mech == By_Descriptor)
4969 /* Build both a 32-bit and 64-bit descriptor, one of which will be
4970 chosen in fill_vms_descriptor. */
4972 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
4973 Mechanism (gnat_param),
4976 = build_pointer_type (build_vms_descriptor (gnu_param_type,
4977 Mechanism (gnat_param),
4981 /* Arrays are passed as pointers to element type for foreign conventions. */
4984 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
4986 /* Strip off any multi-dimensional entries, then strip
4987 off the last array to get the component type. */
4988 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
4989 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
4990 gnu_param_type = TREE_TYPE (gnu_param_type);
4992 by_component_ptr = true;
4993 gnu_param_type = TREE_TYPE (gnu_param_type);
4996 gnu_param_type = build_qualified_type (gnu_param_type,
4997 (TYPE_QUALS (gnu_param_type)
4998 | TYPE_QUAL_CONST));
5000 gnu_param_type = build_pointer_type (gnu_param_type);
5003 /* Fat pointers are passed as thin pointers for foreign conventions. */
5004 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
5006 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5008 /* If we must pass or were requested to pass by reference, do so.
5009 If we were requested to pass by copy, do so.
5010 Otherwise, for foreign conventions, pass In Out or Out parameters
5011 or aggregates by reference. For COBOL and Fortran, pass all
5012 integer and FP types that way too. For Convention Ada, use
5013 the standard Ada default. */
5014 else if (must_pass_by_ref (gnu_param_type)
5015 || mech == By_Reference
5018 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5020 && (Convention (gnat_subprog) == Convention_Fortran
5021 || Convention (gnat_subprog) == Convention_COBOL)
5022 && (INTEGRAL_TYPE_P (gnu_param_type)
5023 || FLOAT_TYPE_P (gnu_param_type)))
5025 && default_pass_by_ref (gnu_param_type)))))
5027 gnu_param_type = build_reference_type (gnu_param_type);
5031 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5035 if (mech == By_Copy && (by_ref || by_component_ptr))
5036 post_error ("?cannot pass & by copy", gnat_param);
5038 /* If this is an Out parameter that isn't passed by reference and isn't
5039 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5040 it will be a VAR_DECL created when we process the procedure, so just
5041 return its type. For the special parameter of a valued procedure,
5044 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5045 Out parameters with discriminants or implicit initial values to be
5046 handled like In Out parameters. These type are normally built as
5047 aggregates, hence passed by reference, except for some packed arrays
5048 which end up encoded in special integer types.
5050 The exception we need to make is then for packed arrays of records
5051 with discriminants or implicit initial values. We have no light/easy
5052 way to check for the latter case, so we merely check for packed arrays
5053 of records. This may lead to useless copy-in operations, but in very
5054 rare cases only, as these would be exceptions in a set of already
5055 exceptional situations. */
5056 if (Ekind (gnat_param) == E_Out_Parameter
5059 || (mech != By_Descriptor
5060 && mech != By_Short_Descriptor
5061 && !POINTER_TYPE_P (gnu_param_type)
5062 && !AGGREGATE_TYPE_P (gnu_param_type)))
5063 && !(Is_Array_Type (Etype (gnat_param))
5064 && Is_Packed (Etype (gnat_param))
5065 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5066 return gnu_param_type;
5068 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5069 ro_param || by_ref || by_component_ptr);
5070 DECL_BY_REF_P (gnu_param) = by_ref;
5071 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5072 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5073 mech == By_Short_Descriptor);
5074 DECL_POINTS_TO_READONLY_P (gnu_param)
5075 = (ro_param && (by_ref || by_component_ptr));
5077 /* Save the alternate descriptor type, if any. */
5078 if (gnu_param_type_alt)
5079 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5081 /* If no Mechanism was specified, indicate what we're using, then
5082 back-annotate it. */
5083 if (mech == Default)
5084 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5086 Set_Mechanism (gnat_param, mech);
5090 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5093 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5095 while (Present (Corresponding_Discriminant (discr1)))
5096 discr1 = Corresponding_Discriminant (discr1);
5098 while (Present (Corresponding_Discriminant (discr2)))
5099 discr2 = Corresponding_Discriminant (discr2);
5102 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5105 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
5106 a non-aliased component in the back-end sense. */
5109 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
5111 /* If the type below this is a multi-array type, then
5112 this does not have aliased components. */
5113 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5114 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5117 if (Has_Aliased_Components (gnat_type))
5120 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5123 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5126 compile_time_known_address_p (Node_Id gnat_address)
5128 /* Catch System'To_Address. */
5129 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5130 gnat_address = Expression (gnat_address);
5132 return Compile_Time_Known_Value (gnat_address);
5135 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5136 be elaborated at the point of its definition, but do nothing else. */
5139 elaborate_entity (Entity_Id gnat_entity)
5141 switch (Ekind (gnat_entity))
5143 case E_Signed_Integer_Subtype:
5144 case E_Modular_Integer_Subtype:
5145 case E_Enumeration_Subtype:
5146 case E_Ordinary_Fixed_Point_Subtype:
5147 case E_Decimal_Fixed_Point_Subtype:
5148 case E_Floating_Point_Subtype:
5150 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5151 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5153 /* ??? Tests for avoiding static constraint error expression
5154 is needed until the front stops generating bogus conversions
5155 on bounds of real types. */
5157 if (!Raises_Constraint_Error (gnat_lb))
5158 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5159 1, 0, Needs_Debug_Info (gnat_entity));
5160 if (!Raises_Constraint_Error (gnat_hb))
5161 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5162 1, 0, Needs_Debug_Info (gnat_entity));
5168 Node_Id full_definition = Declaration_Node (gnat_entity);
5169 Node_Id record_definition = Type_Definition (full_definition);
5171 /* If this is a record extension, go a level further to find the
5172 record definition. */
5173 if (Nkind (record_definition) == N_Derived_Type_Definition)
5174 record_definition = Record_Extension_Part (record_definition);
5178 case E_Record_Subtype:
5179 case E_Private_Subtype:
5180 case E_Limited_Private_Subtype:
5181 case E_Record_Subtype_With_Private:
5182 if (Is_Constrained (gnat_entity)
5183 && Has_Discriminants (Base_Type (gnat_entity))
5184 && Present (Discriminant_Constraint (gnat_entity)))
5186 Node_Id gnat_discriminant_expr;
5187 Entity_Id gnat_field;
5189 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
5190 gnat_discriminant_expr
5191 = First_Elmt (Discriminant_Constraint (gnat_entity));
5192 Present (gnat_field);
5193 gnat_field = Next_Discriminant (gnat_field),
5194 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5195 /* ??? For now, ignore access discriminants. */
5196 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5197 elaborate_expression (Node (gnat_discriminant_expr),
5199 get_entity_name (gnat_field), 1, 0, 0);
5206 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5207 any entities on its entity chain similarly. */
5210 mark_out_of_scope (Entity_Id gnat_entity)
5212 Entity_Id gnat_sub_entity;
5213 unsigned int kind = Ekind (gnat_entity);
5215 /* If this has an entity list, process all in the list. */
5216 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5217 || IN (kind, Private_Kind)
5218 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5219 || kind == E_Function || kind == E_Generic_Function
5220 || kind == E_Generic_Package || kind == E_Generic_Procedure
5221 || kind == E_Loop || kind == E_Operator || kind == E_Package
5222 || kind == E_Package_Body || kind == E_Procedure
5223 || kind == E_Record_Type || kind == E_Record_Subtype
5224 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5225 for (gnat_sub_entity = First_Entity (gnat_entity);
5226 Present (gnat_sub_entity);
5227 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5228 if (Scope (gnat_sub_entity) == gnat_entity
5229 && gnat_sub_entity != gnat_entity)
5230 mark_out_of_scope (gnat_sub_entity);
5232 /* Now clear this if it has been defined, but only do so if it isn't
5233 a subprogram or parameter. We could refine this, but it isn't
5234 worth it. If this is statically allocated, it is supposed to
5235 hang around out of cope. */
5236 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5237 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5239 save_gnu_tree (gnat_entity, NULL_TREE, true);
5240 save_gnu_tree (gnat_entity, error_mark_node, true);
5244 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5245 If this is a multi-dimensional array type, do this recursively.
5248 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5249 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5250 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5253 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5255 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5256 of a one-dimensional array, since the padding has the same alias set
5257 as the field type, but if it's a multi-dimensional array, we need to
5258 see the inner types. */
5259 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5260 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5261 || TYPE_IS_PADDING_P (gnu_old_type)))
5262 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5264 /* Unconstrained array types are deemed incomplete and would thus be given
5265 alias set 0. Retrieve the underlying array type. */
5266 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5268 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5269 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5271 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5273 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5274 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5275 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5276 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5280 case ALIAS_SET_COPY:
5281 /* The alias set shouldn't be copied between array types with different
5282 aliasing settings because this can break the aliasing relationship
5283 between the array type and its element type. */
5284 #ifndef ENABLE_CHECKING
5285 if (flag_strict_aliasing)
5287 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5288 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5289 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5290 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5292 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5295 case ALIAS_SET_SUBSET:
5296 case ALIAS_SET_SUPERSET:
5298 alias_set_type old_set = get_alias_set (gnu_old_type);
5299 alias_set_type new_set = get_alias_set (gnu_new_type);
5301 /* Do nothing if the alias sets conflict. This ensures that we
5302 never call record_alias_subset several times for the same pair
5303 or at all for alias set 0. */
5304 if (!alias_sets_conflict_p (old_set, new_set))
5306 if (op == ALIAS_SET_SUBSET)
5307 record_alias_subset (old_set, new_set);
5309 record_alias_subset (new_set, old_set);
5318 record_component_aliases (gnu_new_type);
5321 /* Return a TREE_LIST describing the substitutions needed to reflect
5322 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
5323 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
5324 of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE
5325 gives the tree for the discriminant and TREE_VALUES is the replacement
5326 value. They are in the form of operands to substitute_in_expr.
5327 DEFINITION is as in gnat_to_gnu_entity. */
5330 substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type,
5331 tree gnu_list, bool definition)
5333 Entity_Id gnat_discrim;
5337 gnat_type = Implementation_Base_Type (gnat_subtype);
5339 if (Has_Discriminants (gnat_type))
5340 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5341 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5342 Present (gnat_discrim);
5343 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5344 gnat_value = Next_Elmt (gnat_value))
5345 /* Ignore access discriminants. */
5346 if (!Is_Access_Type (Etype (Node (gnat_value))))
5347 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5348 elaborate_expression
5349 (Node (gnat_value), gnat_subtype,
5350 get_entity_name (gnat_discrim), definition,
5357 /* Return true if the size represented by GNU_SIZE can be handled by an
5358 allocation. If STATIC_P is true, consider only what can be done with a
5359 static allocation. */
5362 allocatable_size_p (tree gnu_size, bool static_p)
5364 HOST_WIDE_INT our_size;
5366 /* If this is not a static allocation, the only case we want to forbid
5367 is an overflowing size. That will be converted into a raise a
5370 return !(TREE_CODE (gnu_size) == INTEGER_CST
5371 && TREE_OVERFLOW (gnu_size));
5373 /* Otherwise, we need to deal with both variable sizes and constant
5374 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5375 since assemblers may not like very large sizes. */
5376 if (!host_integerp (gnu_size, 1))
5379 our_size = tree_low_cst (gnu_size, 1);
5380 return (int) our_size == our_size;
5383 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5384 NAME, ARGS and ERROR_POINT. */
5387 prepend_one_attribute_to (struct attrib ** attr_list,
5388 enum attr_type attr_type,
5391 Node_Id attr_error_point)
5393 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5395 attr->type = attr_type;
5396 attr->name = attr_name;
5397 attr->args = attr_args;
5398 attr->error_point = attr_error_point;
5400 attr->next = *attr_list;
5404 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5407 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5411 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5412 gnat_temp = Next_Rep_Item (gnat_temp))
5413 if (Nkind (gnat_temp) == N_Pragma)
5415 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5416 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5417 enum attr_type etype;
5419 if (Present (gnat_assoc) && Present (First (gnat_assoc))
5420 && Present (Next (First (gnat_assoc)))
5421 && (Nkind (Expression (Next (First (gnat_assoc))))
5422 == N_String_Literal))
5424 gnu_arg0 = get_identifier (TREE_STRING_POINTER
5427 (First (gnat_assoc))))));
5428 if (Present (Next (Next (First (gnat_assoc))))
5429 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
5430 == N_String_Literal))
5431 gnu_arg1 = get_identifier (TREE_STRING_POINTER
5435 (First (gnat_assoc)))))));
5438 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5440 case Pragma_Machine_Attribute:
5441 etype = ATTR_MACHINE_ATTRIBUTE;
5444 case Pragma_Linker_Alias:
5445 etype = ATTR_LINK_ALIAS;
5448 case Pragma_Linker_Section:
5449 etype = ATTR_LINK_SECTION;
5452 case Pragma_Linker_Constructor:
5453 etype = ATTR_LINK_CONSTRUCTOR;
5456 case Pragma_Linker_Destructor:
5457 etype = ATTR_LINK_DESTRUCTOR;
5460 case Pragma_Weak_External:
5461 etype = ATTR_WEAK_EXTERNAL;
5464 case Pragma_Thread_Local_Storage:
5465 etype = ATTR_THREAD_LOCAL_STORAGE;
5473 /* Prepend to the list now. Make a list of the argument we might
5474 have, as GCC expects it. */
5475 prepend_one_attribute_to
5478 (gnu_arg1 != NULL_TREE)
5479 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5480 Present (Next (First (gnat_assoc)))
5481 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5485 /* Called when we need to protect a variable object using a save_expr. */
5488 maybe_variable (tree gnu_operand)
5490 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
5491 || TREE_CODE (gnu_operand) == SAVE_EXPR
5492 || TREE_CODE (gnu_operand) == NULL_EXPR)
5495 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5497 tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF,
5498 TREE_TYPE (gnu_operand),
5499 variable_size (TREE_OPERAND (gnu_operand, 0)));
5501 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5502 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5506 return variable_size (gnu_operand);
5509 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5510 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5511 return the GCC tree to use for that expression. GNU_NAME is the
5512 qualification to use if an external name is appropriate and DEFINITION is
5513 true if this is a definition of GNAT_ENTITY. If NEED_VALUE is true, we
5514 need a result. Otherwise, we are just elaborating this for side-effects.
5515 If NEED_DEBUG is true we need the symbol for debugging purposes even if it
5516 isn't needed for code generation. */
5519 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity,
5520 tree gnu_name, bool definition, bool need_value,
5525 /* If we already elaborated this expression (e.g., it was involved
5526 in the definition of a private type), use the old value. */
5527 if (present_gnu_tree (gnat_expr))
5528 return get_gnu_tree (gnat_expr);
5530 /* If we don't need a value and this is static or a discriminant, we
5531 don't need to do anything. */
5532 else if (!need_value
5533 && (Is_OK_Static_Expression (gnat_expr)
5534 || (Nkind (gnat_expr) == N_Identifier
5535 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5538 /* Otherwise, convert this tree to its GCC equivalent. */
5540 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
5541 gnu_name, definition, need_debug);
5543 /* Save the expression in case we try to elaborate this entity again. Since
5544 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5545 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5546 save_gnu_tree (gnat_expr, gnu_expr, true);
5548 return need_value ? gnu_expr : error_mark_node;
5551 /* Similar, but take a GNU expression. */
5554 elaborate_expression_1 (Node_Id gnat_expr, Entity_Id gnat_entity,
5555 tree gnu_expr, tree gnu_name, bool definition,
5558 tree gnu_decl = NULL_TREE;
5559 /* Skip any conversions and simple arithmetics to see if the expression
5560 is a read-only variable.
5561 ??? This really should remain read-only, but we have to think about
5562 the typing of the tree here. */
5564 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5565 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5568 /* In most cases, we won't see a naked FIELD_DECL here because a
5569 discriminant reference will have been replaced with a COMPONENT_REF
5570 when the type is being elaborated. However, there are some cases
5571 involving child types where we will. So convert it to a COMPONENT_REF
5572 here. We have to hope it will be at the highest level of the
5573 expression in these cases. */
5574 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5575 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5576 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5577 gnu_expr, NULL_TREE);
5579 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5580 that is read-only, make a variable that is initialized to contain the
5581 bound when the package containing the definition is elaborated. If
5582 this entity is defined at top level and a bound or discriminant value
5583 isn't a constant or a reference to a discriminant, replace the bound
5584 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5585 rely here on the fact that an expression cannot contain both the
5586 discriminant and some other variable. */
5588 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5589 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5590 && (TREE_READONLY (gnu_inner_expr)
5591 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5592 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5594 /* If this is a static expression or contains a discriminant, we don't
5595 need the variable for debugging (and can't elaborate anyway if a
5598 && (Is_OK_Static_Expression (gnat_expr)
5599 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
5602 /* Now create the variable if we need it. */
5603 if (need_debug || (expr_variable && expr_global))
5605 = create_var_decl (create_concat_name (gnat_entity,
5606 IDENTIFIER_POINTER (gnu_name)),
5607 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5608 !need_debug, Is_Public (gnat_entity),
5609 !definition, false, NULL, gnat_entity);
5611 /* We only need to use this variable if we are in global context since GCC
5612 can do the right thing in the local case. */
5613 if (expr_global && expr_variable)
5615 else if (!expr_variable)
5618 return maybe_variable (gnu_expr);
5621 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5622 starting bit position so that it is aligned to ALIGN bits, and leaving at
5623 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5624 record is guaranteed to get. */
5627 make_aligning_type (tree type, unsigned int align, tree size,
5628 unsigned int base_align, int room)
5630 /* We will be crafting a record type with one field at a position set to be
5631 the next multiple of ALIGN past record'address + room bytes. We use a
5632 record placeholder to express record'address. */
5634 tree record_type = make_node (RECORD_TYPE);
5635 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5638 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5640 /* The diagram below summarizes the shape of what we manipulate:
5642 <--------- pos ---------->
5643 { +------------+-------------+-----------------+
5644 record =>{ |############| ... | field (type) |
5645 { +------------+-------------+-----------------+
5646 |<-- room -->|<- voffset ->|<---- size ----->|
5649 record_addr vblock_addr
5651 Every length is in sizetype bytes there, except "pos" which has to be
5652 set as a bit position in the GCC tree for the record. */
5654 tree room_st = size_int (room);
5655 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5656 tree voffset_st, pos, field;
5658 tree name = TYPE_NAME (type);
5660 if (TREE_CODE (name) == TYPE_DECL)
5661 name = DECL_NAME (name);
5663 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5665 /* Compute VOFFSET and then POS. The next byte position multiple of some
5666 alignment after some address is obtained by "and"ing the alignment minus
5667 1 with the two's complement of the address. */
5669 voffset_st = size_binop (BIT_AND_EXPR,
5670 size_diffop (size_zero_node, vblock_addr_st),
5671 ssize_int ((align / BITS_PER_UNIT) - 1));
5673 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5675 pos = size_binop (MULT_EXPR,
5676 convert (bitsizetype,
5677 size_binop (PLUS_EXPR, room_st, voffset_st)),
5680 /* Craft the GCC record representation. We exceptionally do everything
5681 manually here because 1) our generic circuitry is not quite ready to
5682 handle the complex position/size expressions we are setting up, 2) we
5683 have a strong simplifying factor at hand: we know the maximum possible
5684 value of voffset, and 3) we have to set/reset at least the sizes in
5685 accordance with this maximum value anyway, as we need them to convey
5686 what should be "alloc"ated for this type.
5688 Use -1 as the 'addressable' indication for the field to prevent the
5689 creation of a bitfield. We don't need one, it would have damaging
5690 consequences on the alignment computation, and create_field_decl would
5691 make one without this special argument, for instance because of the
5692 complex position expression. */
5694 field = create_field_decl (get_identifier ("F"), type, record_type,
5696 TYPE_FIELDS (record_type) = field;
5698 TYPE_ALIGN (record_type) = base_align;
5699 TYPE_USER_ALIGN (record_type) = 1;
5701 TYPE_SIZE (record_type)
5702 = size_binop (PLUS_EXPR,
5703 size_binop (MULT_EXPR, convert (bitsizetype, size),
5705 bitsize_int (align + room * BITS_PER_UNIT));
5706 TYPE_SIZE_UNIT (record_type)
5707 = size_binop (PLUS_EXPR, size,
5708 size_int (room + align / BITS_PER_UNIT));
5710 SET_TYPE_MODE (record_type, BLKmode);
5712 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5716 /* Return the result of rounding T up to ALIGN. */
5718 static inline unsigned HOST_WIDE_INT
5719 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5727 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5728 as the field type of a packed record if IN_RECORD is true, or as the
5729 component type of a packed array if IN_RECORD is false. See if we can
5730 rewrite it either as a type that has a non-BLKmode, which we can pack
5731 tighter in the packed record case, or as a smaller type. If so, return
5732 the new type. If not, return the original type. */
5735 make_packable_type (tree type, bool in_record)
5737 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5738 unsigned HOST_WIDE_INT new_size;
5739 tree new_type, old_field, field_list = NULL_TREE;
5741 /* No point in doing anything if the size is zero. */
5745 new_type = make_node (TREE_CODE (type));
5747 /* Copy the name and flags from the old type to that of the new.
5748 Note that we rely on the pointer equality created here for
5749 TYPE_NAME to look through conversions in various places. */
5750 TYPE_NAME (new_type) = TYPE_NAME (type);
5751 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5752 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5753 if (TREE_CODE (type) == RECORD_TYPE)
5754 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5756 /* If we are in a record and have a small size, set the alignment to
5757 try for an integral mode. Otherwise set it to try for a smaller
5758 type with BLKmode. */
5759 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5761 TYPE_ALIGN (new_type) = ceil_alignment (size);
5762 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5766 unsigned HOST_WIDE_INT align;
5768 /* Do not try to shrink the size if the RM size is not constant. */
5769 if (TYPE_CONTAINS_TEMPLATE_P (type)
5770 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5773 /* Round the RM size up to a unit boundary to get the minimal size
5774 for a BLKmode record. Give up if it's already the size. */
5775 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5776 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5777 if (new_size == size)
5780 align = new_size & -new_size;
5781 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5784 TYPE_USER_ALIGN (new_type) = 1;
5786 /* Now copy the fields, keeping the position and size as we don't want
5787 to change the layout by propagating the packedness downwards. */
5788 for (old_field = TYPE_FIELDS (type); old_field;
5789 old_field = TREE_CHAIN (old_field))
5791 tree new_field_type = TREE_TYPE (old_field);
5792 tree new_field, new_size;
5794 if ((TREE_CODE (new_field_type) == RECORD_TYPE
5795 || TREE_CODE (new_field_type) == UNION_TYPE
5796 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5797 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5798 && host_integerp (TYPE_SIZE (new_field_type), 1))
5799 new_field_type = make_packable_type (new_field_type, true);
5801 /* However, for the last field in a not already packed record type
5802 that is of an aggregate type, we need to use the RM size in the
5803 packable version of the record type, see finish_record_type. */
5804 if (!TREE_CHAIN (old_field)
5805 && !TYPE_PACKED (type)
5806 && (TREE_CODE (new_field_type) == RECORD_TYPE
5807 || TREE_CODE (new_field_type) == UNION_TYPE
5808 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5809 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5810 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5811 && TYPE_ADA_SIZE (new_field_type))
5812 new_size = TYPE_ADA_SIZE (new_field_type);
5814 new_size = DECL_SIZE (old_field);
5816 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5817 new_type, TYPE_PACKED (type), new_size,
5818 bit_position (old_field),
5819 !DECL_NONADDRESSABLE_P (old_field));
5821 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
5822 SET_DECL_ORIGINAL_FIELD
5823 (new_field, (DECL_ORIGINAL_FIELD (old_field)
5824 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
5826 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
5827 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
5829 TREE_CHAIN (new_field) = field_list;
5830 field_list = new_field;
5833 finish_record_type (new_type, nreverse (field_list), 2, true);
5834 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
5836 /* If this is a padding record, we never want to make the size smaller
5837 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
5838 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5839 || TREE_CODE (type) == QUAL_UNION_TYPE)
5841 TYPE_SIZE (new_type) = TYPE_SIZE (type);
5842 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
5846 TYPE_SIZE (new_type) = bitsize_int (new_size);
5847 TYPE_SIZE_UNIT (new_type)
5848 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
5851 if (!TYPE_CONTAINS_TEMPLATE_P (type))
5852 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
5854 compute_record_mode (new_type);
5856 /* Try harder to get a packable type if necessary, for example
5857 in case the record itself contains a BLKmode field. */
5858 if (in_record && TYPE_MODE (new_type) == BLKmode)
5859 SET_TYPE_MODE (new_type,
5860 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
5862 /* If neither the mode nor the size has shrunk, return the old type. */
5863 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
5869 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
5870 if needed. We have already verified that SIZE and TYPE are large enough.
5872 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
5875 IS_USER_TYPE is true if we must complete the original type.
5877 DEFINITION is true if this type is being defined.
5879 SAME_RM_SIZE is true if the RM size of the resulting type is to be set
5880 to SIZE too; otherwise, it's set to the RM size of the original type. */
5883 maybe_pad_type (tree type, tree size, unsigned int align,
5884 Entity_Id gnat_entity, const char *name_trailer,
5885 bool is_user_type, bool definition, bool same_rm_size)
5887 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
5888 tree orig_size = TYPE_SIZE (type);
5889 unsigned int orig_align = align;
5892 /* If TYPE is a padded type, see if it agrees with any size and alignment
5893 we were given. If so, return the original type. Otherwise, strip
5894 off the padding, since we will either be returning the inner type
5895 or repadding it. If no size or alignment is specified, use that of
5896 the original padded type. */
5897 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5900 || operand_equal_p (round_up (size,
5901 MAX (align, TYPE_ALIGN (type))),
5902 round_up (TYPE_SIZE (type),
5903 MAX (align, TYPE_ALIGN (type))),
5905 && (align == 0 || align == TYPE_ALIGN (type)))
5909 size = TYPE_SIZE (type);
5911 align = TYPE_ALIGN (type);
5913 type = TREE_TYPE (TYPE_FIELDS (type));
5914 orig_size = TYPE_SIZE (type);
5917 /* If the size is either not being changed or is being made smaller (which
5918 is not done here (and is only valid for bitfields anyway), show the size
5919 isn't changing. Likewise, clear the alignment if it isn't being
5920 changed. Then return if we aren't doing anything. */
5922 && (operand_equal_p (size, orig_size, 0)
5923 || (TREE_CODE (orig_size) == INTEGER_CST
5924 && tree_int_cst_lt (size, orig_size))))
5927 if (align == TYPE_ALIGN (type))
5930 if (align == 0 && !size)
5933 /* If requested, complete the original type and give it a name. */
5935 create_type_decl (get_entity_name (gnat_entity), type,
5936 NULL, !Comes_From_Source (gnat_entity),
5938 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
5939 && DECL_IGNORED_P (TYPE_NAME (type))),
5942 /* We used to modify the record in place in some cases, but that could
5943 generate incorrect debugging information. So make a new record
5945 record = make_node (RECORD_TYPE);
5946 TYPE_IS_PADDING_P (record) = 1;
5948 if (Present (gnat_entity))
5949 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
5951 TYPE_VOLATILE (record)
5952 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
5954 TYPE_ALIGN (record) = align;
5956 TYPE_USER_ALIGN (record) = align;
5958 TYPE_SIZE (record) = size ? size : orig_size;
5959 TYPE_SIZE_UNIT (record)
5960 = convert (sizetype,
5961 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
5962 bitsize_unit_node));
5964 /* If we are changing the alignment and the input type is a record with
5965 BLKmode and a small constant size, try to make a form that has an
5966 integral mode. This might allow the padding record to also have an
5967 integral mode, which will be much more efficient. There is no point
5968 in doing so if a size is specified unless it is also a small constant
5969 size and it is incorrect to do so if we cannot guarantee that the mode
5970 will be naturally aligned since the field must always be addressable.
5972 ??? This might not always be a win when done for a stand-alone object:
5973 since the nominal and the effective type of the object will now have
5974 different modes, a VIEW_CONVERT_EXPR will be required for converting
5975 between them and it might be hard to overcome afterwards, including
5976 at the RTL level when the stand-alone object is accessed as a whole. */
5978 && TREE_CODE (type) == RECORD_TYPE
5979 && TYPE_MODE (type) == BLKmode
5980 && TREE_CODE (orig_size) == INTEGER_CST
5981 && !TREE_OVERFLOW (orig_size)
5982 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
5984 || (TREE_CODE (size) == INTEGER_CST
5985 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
5987 tree packable_type = make_packable_type (type, true);
5988 if (TYPE_MODE (packable_type) != BLKmode
5989 && align >= TYPE_ALIGN (packable_type))
5990 type = packable_type;
5993 /* Now create the field with the original size. */
5994 field = create_field_decl (get_identifier ("F"), type, record, 0,
5995 orig_size, bitsize_zero_node, 1);
5996 DECL_INTERNAL_P (field) = 1;
5998 /* Do not finalize it until after the auxiliary record is built. */
5999 finish_record_type (record, field, 1, true);
6001 /* Set the same size for its RM size if requested; otherwise reuse
6002 the RM size of the original type. */
6003 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6005 /* Unless debugging information isn't being written for the input type,
6006 write a record that shows what we are a subtype of and also make a
6007 variable that indicates our size, if still variable. */
6008 if (TYPE_NAME (record)
6009 && AGGREGATE_TYPE_P (type)
6010 && TREE_CODE (orig_size) != INTEGER_CST
6011 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6012 && DECL_IGNORED_P (TYPE_NAME (type))))
6014 tree marker = make_node (RECORD_TYPE);
6015 tree name = TYPE_NAME (record);
6016 tree orig_name = TYPE_NAME (type);
6018 if (TREE_CODE (name) == TYPE_DECL)
6019 name = DECL_NAME (name);
6021 if (TREE_CODE (orig_name) == TYPE_DECL)
6022 orig_name = DECL_NAME (orig_name);
6024 TYPE_NAME (marker) = concat_name (name, "XVS");
6025 finish_record_type (marker,
6026 create_field_decl (orig_name, integer_type_node,
6027 marker, 0, NULL_TREE, NULL_TREE,
6031 add_parallel_type (TYPE_STUB_DECL (record), marker);
6033 if (size && TREE_CODE (size) != INTEGER_CST && definition)
6034 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6035 TYPE_SIZE_UNIT (record), false, false, false,
6036 false, NULL, gnat_entity);
6039 rest_of_record_type_compilation (record);
6041 /* If the size was widened explicitly, maybe give a warning. Take the
6042 original size as the maximum size of the input if there was an
6043 unconstrained record involved and round it up to the specified alignment,
6044 if one was specified. */
6045 if (CONTAINS_PLACEHOLDER_P (orig_size))
6046 orig_size = max_size (orig_size, true);
6049 orig_size = round_up (orig_size, align);
6051 if (size && Present (gnat_entity)
6052 && !operand_equal_p (size, orig_size, 0)
6053 && !(TREE_CODE (size) == INTEGER_CST
6054 && TREE_CODE (orig_size) == INTEGER_CST
6055 && tree_int_cst_lt (size, orig_size)))
6057 Node_Id gnat_error_node = Empty;
6059 if (Is_Packed_Array_Type (gnat_entity))
6060 gnat_entity = Original_Array_Type (gnat_entity);
6062 if ((Ekind (gnat_entity) == E_Component
6063 || Ekind (gnat_entity) == E_Discriminant)
6064 && Present (Component_Clause (gnat_entity)))
6065 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6066 else if (Present (Size_Clause (gnat_entity)))
6067 gnat_error_node = Expression (Size_Clause (gnat_entity));
6069 /* Generate message only for entities that come from source, since
6070 if we have an entity created by expansion, the message will be
6071 generated for some other corresponding source entity. */
6072 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
6073 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
6075 size_diffop (size, orig_size));
6077 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
6078 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6079 gnat_entity, gnat_entity,
6080 size_diffop (size, orig_size));
6086 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6087 the value passed against the list of choices. */
6090 choices_to_gnu (tree operand, Node_Id choices)
6094 tree result = integer_zero_node;
6095 tree this_test, low = 0, high = 0, single = 0;
6097 for (choice = First (choices); Present (choice); choice = Next (choice))
6099 switch (Nkind (choice))
6102 low = gnat_to_gnu (Low_Bound (choice));
6103 high = gnat_to_gnu (High_Bound (choice));
6105 /* There's no good type to use here, so we might as well use
6106 integer_type_node. */
6108 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6109 build_binary_op (GE_EXPR, integer_type_node,
6111 build_binary_op (LE_EXPR, integer_type_node,
6116 case N_Subtype_Indication:
6117 gnat_temp = Range_Expression (Constraint (choice));
6118 low = gnat_to_gnu (Low_Bound (gnat_temp));
6119 high = gnat_to_gnu (High_Bound (gnat_temp));
6122 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6123 build_binary_op (GE_EXPR, integer_type_node,
6125 build_binary_op (LE_EXPR, integer_type_node,
6130 case N_Expanded_Name:
6131 /* This represents either a subtype range, an enumeration
6132 literal, or a constant Ekind says which. If an enumeration
6133 literal or constant, fall through to the next case. */
6134 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6135 && Ekind (Entity (choice)) != E_Constant)
6137 tree type = gnat_to_gnu_type (Entity (choice));
6139 low = TYPE_MIN_VALUE (type);
6140 high = TYPE_MAX_VALUE (type);
6143 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6144 build_binary_op (GE_EXPR, integer_type_node,
6146 build_binary_op (LE_EXPR, integer_type_node,
6151 /* ... fall through ... */
6153 case N_Character_Literal:
6154 case N_Integer_Literal:
6155 single = gnat_to_gnu (choice);
6156 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6160 case N_Others_Choice:
6161 this_test = integer_one_node;
6168 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6175 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6176 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6179 adjust_packed (tree field_type, tree record_type, int packed)
6181 /* If the field contains an item of variable size, we cannot pack it
6182 because we cannot create temporaries of non-fixed size in case
6183 we need to take the address of the field. See addressable_p and
6184 the notes on the addressability issues for further details. */
6185 if (is_variable_size (field_type))
6188 /* If the alignment of the record is specified and the field type
6189 is over-aligned, request Storage_Unit alignment for the field. */
6192 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6201 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6202 placed in GNU_RECORD_TYPE.
6204 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6205 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6206 record has a specified alignment.
6208 DEFINITION is true if this field is for a record being defined. */
6211 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6214 tree gnu_field_id = get_entity_name (gnat_field);
6215 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6216 tree gnu_field, gnu_size, gnu_pos;
6217 bool needs_strict_alignment
6218 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6219 || Treat_As_Volatile (gnat_field));
6221 /* If this field requires strict alignment, we cannot pack it because
6222 it would very likely be under-aligned in the record. */
6223 if (needs_strict_alignment)
6226 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6228 /* If a size is specified, use it. Otherwise, if the record type is packed,
6229 use the official RM size. See "Handling of Type'Size Values" in Einfo
6230 for further details. */
6231 if (Known_Static_Esize (gnat_field))
6232 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6233 gnat_field, FIELD_DECL, false, true);
6234 else if (packed == 1)
6235 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6236 gnat_field, FIELD_DECL, false, true);
6238 gnu_size = NULL_TREE;
6240 /* If we have a specified size that's smaller than that of the field type,
6241 or a position is specified, and the field type is a record, see if we can
6242 get either an integral mode form of the type or a smaller form. If we
6243 can, show a size was specified for the field if there wasn't one already,
6244 so we know to make this a bitfield and avoid making things wider.
6246 Doing this is first useful if the record is packed because we may then
6247 place the field at a non-byte-aligned position and so achieve tighter
6250 This is in addition *required* if the field shares a byte with another
6251 field and the front-end lets the back-end handle the references, because
6252 GCC does not handle BLKmode bitfields properly.
6254 We avoid the transformation if it is not required or potentially useful,
6255 as it might entail an increase of the field's alignment and have ripple
6256 effects on the outer record type. A typical case is a field known to be
6257 byte aligned and not to share a byte with another field.
6259 Besides, we don't even look the possibility of a transformation in cases
6260 known to be in error already, for instance when an invalid size results
6261 from a component clause. */
6263 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6264 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
6265 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6268 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6269 || Present (Component_Clause (gnat_field))))))
6271 /* See what the alternate type and size would be. */
6272 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6274 bool has_byte_aligned_clause
6275 = Present (Component_Clause (gnat_field))
6276 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6277 % BITS_PER_UNIT == 0);
6279 /* Compute whether we should avoid the substitution. */
6281 /* There is no point substituting if there is no change... */
6282 = (gnu_packable_type == gnu_field_type)
6283 /* ... nor when the field is known to be byte aligned and not to
6284 share a byte with another field. */
6285 || (has_byte_aligned_clause
6286 && value_factor_p (gnu_size, BITS_PER_UNIT))
6287 /* The size of an aliased field must be an exact multiple of the
6288 type's alignment, which the substitution might increase. Reject
6289 substitutions that would so invalidate a component clause when the
6290 specified position is byte aligned, as the change would have no
6291 real benefit from the packing standpoint anyway. */
6292 || (Is_Aliased (gnat_field)
6293 && has_byte_aligned_clause
6294 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6296 /* Substitute unless told otherwise. */
6299 gnu_field_type = gnu_packable_type;
6302 gnu_size = rm_size (gnu_field_type);
6306 /* If we are packing the record and the field is BLKmode, round the
6307 size up to a byte boundary. */
6308 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6309 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6311 if (Present (Component_Clause (gnat_field)))
6313 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6314 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6315 gnat_field, FIELD_DECL, false, true);
6317 /* Ensure the position does not overlap with the parent subtype,
6319 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6322 = gnat_to_gnu_type (Parent_Subtype
6323 (Underlying_Type (Scope (gnat_field))));
6325 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6326 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6329 ("offset of& must be beyond parent{, minimum allowed is ^}",
6330 First_Bit (Component_Clause (gnat_field)), gnat_field,
6331 TYPE_SIZE_UNIT (gnu_parent));
6335 /* If this field needs strict alignment, ensure the record is
6336 sufficiently aligned and that that position and size are
6337 consistent with the alignment. */
6338 if (needs_strict_alignment)
6340 TYPE_ALIGN (gnu_record_type)
6341 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6344 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6346 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6348 ("atomic field& must be natural size of type{ (^)}",
6349 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6350 TYPE_SIZE (gnu_field_type));
6352 else if (Is_Aliased (gnat_field))
6354 ("size of aliased field& must be ^ bits",
6355 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6356 TYPE_SIZE (gnu_field_type));
6358 else if (Strict_Alignment (Etype (gnat_field)))
6360 ("size of & with aliased or tagged components not ^ bits",
6361 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6362 TYPE_SIZE (gnu_field_type));
6364 gnu_size = NULL_TREE;
6367 if (!integer_zerop (size_binop
6368 (TRUNC_MOD_EXPR, gnu_pos,
6369 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6371 if (Is_Aliased (gnat_field))
6373 ("position of aliased field& must be multiple of ^ bits",
6374 First_Bit (Component_Clause (gnat_field)), gnat_field,
6375 TYPE_ALIGN (gnu_field_type));
6377 else if (Treat_As_Volatile (gnat_field))
6379 ("position of volatile field& must be multiple of ^ bits",
6380 First_Bit (Component_Clause (gnat_field)), gnat_field,
6381 TYPE_ALIGN (gnu_field_type));
6383 else if (Strict_Alignment (Etype (gnat_field)))
6385 ("position of & with aliased or tagged components not multiple of ^ bits",
6386 First_Bit (Component_Clause (gnat_field)), gnat_field,
6387 TYPE_ALIGN (gnu_field_type));
6392 gnu_pos = NULL_TREE;
6396 if (Is_Atomic (gnat_field))
6397 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6400 /* If the record has rep clauses and this is the tag field, make a rep
6401 clause for it as well. */
6402 else if (Has_Specified_Layout (Scope (gnat_field))
6403 && Chars (gnat_field) == Name_uTag)
6405 gnu_pos = bitsize_zero_node;
6406 gnu_size = TYPE_SIZE (gnu_field_type);
6410 gnu_pos = NULL_TREE;
6412 /* We need to make the size the maximum for the type if it is
6413 self-referential and an unconstrained type. In that case, we can't
6414 pack the field since we can't make a copy to align it. */
6415 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6417 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6418 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6420 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6424 /* If a size is specified, adjust the field's type to it. */
6427 /* If the field's type is justified modular, we would need to remove
6428 the wrapper to (better) meet the layout requirements. However we
6429 can do so only if the field is not aliased to preserve the unique
6430 layout and if the prescribed size is not greater than that of the
6431 packed array to preserve the justification. */
6432 if (!needs_strict_alignment
6433 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6434 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6435 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6437 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6440 = make_type_from_size (gnu_field_type, gnu_size,
6441 Has_Biased_Representation (gnat_field));
6442 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6443 "PAD", false, definition, true);
6446 /* Otherwise (or if there was an error), don't specify a position. */
6448 gnu_pos = NULL_TREE;
6450 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6451 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6453 /* Now create the decl for the field. */
6454 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6455 packed, gnu_size, gnu_pos,
6456 Is_Aliased (gnat_field));
6457 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6458 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6460 if (Ekind (gnat_field) == E_Discriminant)
6461 DECL_DISCRIMINANT_NUMBER (gnu_field)
6462 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6467 /* Return true if TYPE is a type with variable size, a padding type with a
6468 field of variable size or is a record that has a field such a field. */
6471 is_variable_size (tree type)
6475 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6478 if (TREE_CODE (type) == RECORD_TYPE
6479 && TYPE_IS_PADDING_P (type)
6480 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6483 if (TREE_CODE (type) != RECORD_TYPE
6484 && TREE_CODE (type) != UNION_TYPE
6485 && TREE_CODE (type) != QUAL_UNION_TYPE)
6488 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6489 if (is_variable_size (TREE_TYPE (field)))
6495 /* qsort comparer for the bit positions of two record components. */
6498 compare_field_bitpos (const PTR rt1, const PTR rt2)
6500 const_tree const field1 = * (const_tree const *) rt1;
6501 const_tree const field2 = * (const_tree const *) rt2;
6503 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6505 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6508 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
6509 of GCC trees for fields that are in the record and have already been
6510 processed. When called from gnat_to_gnu_entity during the processing of a
6511 record type definition, the GCC nodes for the discriminants will be on
6512 the chain. The other calls to this function are recursive calls from
6513 itself for the Component_List of a variant and the chain is empty.
6515 PACKED is 1 if this is for a packed record, -1 if this is for a record
6516 with Component_Alignment of Storage_Unit, -2 if this is for a record
6517 with a specified alignment.
6519 DEFINITION is true if we are defining this record.
6521 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6522 with a rep clause is to be added. If it is nonzero, that is all that
6523 should be done with such fields.
6525 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6526 laying out the record. This means the alignment only serves to force fields
6527 to be bitfields, but not require the record to be that aligned. This is
6530 ALL_REP, if true, means a rep clause was found for all the fields. This
6531 simplifies the logic since we know we're not in the mixed case.
6533 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6534 modified afterwards so it will not be sent to the back-end for finalization.
6536 UNCHECKED_UNION, if true, means that we are building a type for a record
6537 with a Pragma Unchecked_Union.
6539 The processing of the component list fills in the chain with all of the
6540 fields of the record and then the record type is finished. */
6543 components_to_record (tree gnu_record_type, Node_Id component_list,
6544 tree gnu_field_list, int packed, bool definition,
6545 tree *p_gnu_rep_list, bool cancel_alignment,
6546 bool all_rep, bool do_not_finalize, bool unchecked_union)
6548 Node_Id component_decl;
6549 Entity_Id gnat_field;
6550 Node_Id variant_part;
6551 tree gnu_our_rep_list = NULL_TREE;
6552 tree gnu_field, gnu_last;
6553 bool layout_with_rep = false;
6554 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6556 /* For each variable within each component declaration create a GCC field
6557 and add it to the list, skipping any pragmas in the list. */
6558 if (Present (Component_Items (component_list)))
6559 for (component_decl = First_Non_Pragma (Component_Items (component_list));
6560 Present (component_decl);
6561 component_decl = Next_Non_Pragma (component_decl))
6563 gnat_field = Defining_Entity (component_decl);
6565 if (Chars (gnat_field) == Name_uParent)
6566 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
6569 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6570 packed, definition);
6572 /* If this is the _Tag field, put it before any discriminants,
6573 instead of after them as is the case for all other fields. */
6574 if (Chars (gnat_field) == Name_uTag)
6575 gnu_field_list = chainon (gnu_field_list, gnu_field);
6578 TREE_CHAIN (gnu_field) = gnu_field_list;
6579 gnu_field_list = gnu_field;
6583 save_gnu_tree (gnat_field, gnu_field, false);
6586 /* At the end of the component list there may be a variant part. */
6587 variant_part = Variant_Part (component_list);
6589 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6590 mutually exclusive and should go in the same memory. To do this we need
6591 to treat each variant as a record whose elements are created from the
6592 component list for the variant. So here we create the records from the
6593 lists for the variants and put them all into the QUAL_UNION_TYPE.
6594 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6595 use GNU_RECORD_TYPE if there are no fields so far. */
6596 if (Present (variant_part))
6598 Node_Id gnat_discr = Name (variant_part), variant;
6599 tree gnu_discr = gnat_to_gnu (gnat_discr);
6600 tree gnu_name = TYPE_NAME (gnu_record_type);
6602 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6604 tree gnu_union_type, gnu_union_name, gnu_union_field;
6605 tree gnu_variant_list = NULL_TREE;
6607 if (TREE_CODE (gnu_name) == TYPE_DECL)
6608 gnu_name = DECL_NAME (gnu_name);
6611 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6613 /* Reuse an enclosing union if all fields are in the variant part
6614 and there is no representation clause on the record, to match
6615 the layout of C unions. There is an associated check below. */
6617 && TREE_CODE (gnu_record_type) == UNION_TYPE
6618 && !TYPE_PACKED (gnu_record_type))
6619 gnu_union_type = gnu_record_type;
6623 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6625 TYPE_NAME (gnu_union_type) = gnu_union_name;
6626 TYPE_ALIGN (gnu_union_type) = 0;
6627 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6630 for (variant = First_Non_Pragma (Variants (variant_part));
6632 variant = Next_Non_Pragma (variant))
6634 tree gnu_variant_type = make_node (RECORD_TYPE);
6635 tree gnu_inner_name;
6638 Get_Variant_Encoding (variant);
6639 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6640 TYPE_NAME (gnu_variant_type)
6641 = concat_name (gnu_union_name,
6642 IDENTIFIER_POINTER (gnu_inner_name));
6644 /* Set the alignment of the inner type in case we need to make
6645 inner objects into bitfields, but then clear it out
6646 so the record actually gets only the alignment required. */
6647 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6648 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6650 /* Similarly, if the outer record has a size specified and all fields
6651 have record rep clauses, we can propagate the size into the
6653 if (all_rep_and_size)
6655 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6656 TYPE_SIZE_UNIT (gnu_variant_type)
6657 = TYPE_SIZE_UNIT (gnu_record_type);
6660 /* Create the record type for the variant. Note that we defer
6661 finalizing it until after we are sure to actually use it. */
6662 components_to_record (gnu_variant_type, Component_List (variant),
6663 NULL_TREE, packed, definition,
6664 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6665 true, unchecked_union);
6667 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6669 Set_Present_Expr (variant, annotate_value (gnu_qual));
6671 /* If this is an Unchecked_Union and we have exactly one field,
6672 use this field directly to match the layout of C unions. */
6674 && TYPE_FIELDS (gnu_variant_type)
6675 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6676 gnu_field = TYPE_FIELDS (gnu_variant_type);
6679 /* Deal with packedness like in gnat_to_gnu_field. */
6681 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6683 /* Finalize the record type now. We used to throw away
6684 empty records but we no longer do that because we need
6685 them to generate complete debug info for the variant;
6686 otherwise, the union type definition will be lacking
6687 the fields associated with these empty variants. */
6688 rest_of_record_type_compilation (gnu_variant_type);
6690 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6691 gnu_union_type, field_packed,
6693 ? TYPE_SIZE (gnu_variant_type)
6696 ? bitsize_zero_node : 0),
6699 DECL_INTERNAL_P (gnu_field) = 1;
6701 if (!unchecked_union)
6702 DECL_QUALIFIER (gnu_field) = gnu_qual;
6705 TREE_CHAIN (gnu_field) = gnu_variant_list;
6706 gnu_variant_list = gnu_field;
6709 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
6710 if (gnu_variant_list)
6712 int union_field_packed;
6714 if (all_rep_and_size)
6716 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6717 TYPE_SIZE_UNIT (gnu_union_type)
6718 = TYPE_SIZE_UNIT (gnu_record_type);
6721 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6722 all_rep_and_size ? 1 : 0, false);
6724 /* If GNU_UNION_TYPE is our record type, it means we must have an
6725 Unchecked_Union with no fields. Verify that and, if so, just
6727 if (gnu_union_type == gnu_record_type)
6729 gcc_assert (unchecked_union
6731 && !gnu_our_rep_list);
6735 /* Deal with packedness like in gnat_to_gnu_field. */
6737 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6740 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6742 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6743 all_rep ? bitsize_zero_node : 0, 0);
6745 DECL_INTERNAL_P (gnu_union_field) = 1;
6746 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6747 gnu_field_list = gnu_union_field;
6751 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6752 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
6753 in a separate pass since we want to handle the discriminants but can't
6754 play with them until we've used them in debugging data above.
6756 ??? Note: if we then reorder them, debugging information will be wrong,
6757 but there's nothing that can be done about this at the moment. */
6758 for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; )
6760 if (DECL_FIELD_OFFSET (gnu_field))
6762 tree gnu_next = TREE_CHAIN (gnu_field);
6765 gnu_field_list = gnu_next;
6767 TREE_CHAIN (gnu_last) = gnu_next;
6769 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6770 gnu_our_rep_list = gnu_field;
6771 gnu_field = gnu_next;
6775 gnu_last = gnu_field;
6776 gnu_field = TREE_CHAIN (gnu_field);
6780 /* If we have any items in our rep'ed field list, it is not the case that all
6781 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
6782 set it and ignore the items. */
6783 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6784 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6785 else if (gnu_our_rep_list)
6787 /* Otherwise, sort the fields by bit position and put them into their
6788 own record if we have any fields without rep clauses. */
6790 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6791 int len = list_length (gnu_our_rep_list);
6792 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6795 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
6796 gnu_field = TREE_CHAIN (gnu_field), i++)
6797 gnu_arr[i] = gnu_field;
6799 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6801 /* Put the fields in the list in order of increasing position, which
6802 means we start from the end. */
6803 gnu_our_rep_list = NULL_TREE;
6804 for (i = len - 1; i >= 0; i--)
6806 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6807 gnu_our_rep_list = gnu_arr[i];
6808 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
6813 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
6814 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
6815 gnu_record_type, 0, 0, 0, 1);
6816 DECL_INTERNAL_P (gnu_field) = 1;
6817 gnu_field_list = chainon (gnu_field_list, gnu_field);
6821 layout_with_rep = true;
6822 gnu_field_list = nreverse (gnu_our_rep_list);
6826 if (cancel_alignment)
6827 TYPE_ALIGN (gnu_record_type) = 0;
6829 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
6830 layout_with_rep ? 1 : 0, do_not_finalize);
6833 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
6834 placed into an Esize, Component_Bit_Offset, or Component_Size value
6835 in the GNAT tree. */
6838 annotate_value (tree gnu_size)
6840 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
6842 Node_Ref_Or_Val ops[3], ret;
6845 struct tree_int_map **h = NULL;
6847 /* See if we've already saved the value for this node. */
6848 if (EXPR_P (gnu_size))
6850 struct tree_int_map in;
6851 if (!annotate_value_cache)
6852 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
6853 tree_int_map_eq, 0);
6854 in.base.from = gnu_size;
6855 h = (struct tree_int_map **)
6856 htab_find_slot (annotate_value_cache, &in, INSERT);
6859 return (Node_Ref_Or_Val) (*h)->to;
6862 /* If we do not return inside this switch, TCODE will be set to the
6863 code to use for a Create_Node operand and LEN (set above) will be
6864 the number of recursive calls for us to make. */
6866 switch (TREE_CODE (gnu_size))
6869 if (TREE_OVERFLOW (gnu_size))
6872 /* This may have come from a conversion from some smaller type,
6873 so ensure this is in bitsizetype. */
6874 gnu_size = convert (bitsizetype, gnu_size);
6876 /* For negative values, use NEGATE_EXPR of the supplied value. */
6877 if (tree_int_cst_sgn (gnu_size) < 0)
6879 /* The ridiculous code below is to handle the case of the largest
6880 negative integer. */
6881 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
6882 bool adjust = false;
6885 if (TREE_OVERFLOW (negative_size))
6888 = size_binop (MINUS_EXPR, bitsize_zero_node,
6889 size_binop (PLUS_EXPR, gnu_size,
6894 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
6896 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
6898 return annotate_value (temp);
6901 if (!host_integerp (gnu_size, 1))
6904 size = tree_low_cst (gnu_size, 1);
6906 /* This peculiar test is to make sure that the size fits in an int
6907 on machines where HOST_WIDE_INT is not "int". */
6908 if (tree_low_cst (gnu_size, 1) == size)
6909 return UI_From_Int (size);
6914 /* The only case we handle here is a simple discriminant reference. */
6915 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
6916 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
6917 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
6918 return Create_Node (Discrim_Val,
6919 annotate_value (DECL_DISCRIMINANT_NUMBER
6920 (TREE_OPERAND (gnu_size, 1))),
6925 CASE_CONVERT: case NON_LVALUE_EXPR:
6926 return annotate_value (TREE_OPERAND (gnu_size, 0));
6928 /* Now just list the operations we handle. */
6929 case COND_EXPR: tcode = Cond_Expr; break;
6930 case PLUS_EXPR: tcode = Plus_Expr; break;
6931 case MINUS_EXPR: tcode = Minus_Expr; break;
6932 case MULT_EXPR: tcode = Mult_Expr; break;
6933 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
6934 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
6935 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
6936 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
6937 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
6938 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
6939 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
6940 case NEGATE_EXPR: tcode = Negate_Expr; break;
6941 case MIN_EXPR: tcode = Min_Expr; break;
6942 case MAX_EXPR: tcode = Max_Expr; break;
6943 case ABS_EXPR: tcode = Abs_Expr; break;
6944 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
6945 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
6946 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
6947 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
6948 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
6949 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
6950 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
6951 case LT_EXPR: tcode = Lt_Expr; break;
6952 case LE_EXPR: tcode = Le_Expr; break;
6953 case GT_EXPR: tcode = Gt_Expr; break;
6954 case GE_EXPR: tcode = Ge_Expr; break;
6955 case EQ_EXPR: tcode = Eq_Expr; break;
6956 case NE_EXPR: tcode = Ne_Expr; break;
6962 /* Now get each of the operands that's relevant for this code. If any
6963 cannot be expressed as a repinfo node, say we can't. */
6964 for (i = 0; i < 3; i++)
6967 for (i = 0; i < len; i++)
6969 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
6970 if (ops[i] == No_Uint)
6974 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
6976 /* Save the result in the cache. */
6979 *h = GGC_NEW (struct tree_int_map);
6980 (*h)->base.from = gnu_size;
6987 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
6988 GCC type, set Component_Bit_Offset and Esize to the position and size
6992 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
6996 Entity_Id gnat_field;
6998 /* We operate by first making a list of all fields and their positions
6999 (we can get the sizes easily at any time) by a recursive call
7000 and then update all the sizes into the tree. */
7001 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
7002 size_zero_node, bitsize_zero_node,
7005 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
7006 gnat_field = Next_Entity (gnat_field))
7007 if ((Ekind (gnat_field) == E_Component
7008 || (Ekind (gnat_field) == E_Discriminant
7009 && !Is_Unchecked_Union (Scope (gnat_field)))))
7011 tree parent_offset = bitsize_zero_node;
7013 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
7018 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7020 /* In this mode the tag and parent components have not been
7021 generated, so we add the appropriate offset to each
7022 component. For a component appearing in the current
7023 extension, the offset is the size of the parent. */
7024 if (Is_Derived_Type (gnat_entity)
7025 && Original_Record_Component (gnat_field) == gnat_field)
7027 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7030 parent_offset = bitsize_int (POINTER_SIZE);
7033 Set_Component_Bit_Offset
7036 (size_binop (PLUS_EXPR,
7037 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
7038 TREE_VALUE (TREE_VALUE
7039 (TREE_VALUE (gnu_entry)))),
7042 Set_Esize (gnat_field,
7043 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
7045 else if (Is_Tagged_Type (gnat_entity)
7046 && Is_Derived_Type (gnat_entity))
7048 /* If there is no gnu_entry, this is an inherited component whose
7049 position is the same as in the parent type. */
7050 Set_Component_Bit_Offset
7052 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7053 Set_Esize (gnat_field,
7054 Esize (Original_Record_Component (gnat_field)));
7059 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
7060 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
7061 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
7062 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
7063 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
7064 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
7068 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
7069 tree gnu_bitpos, unsigned int offset_align)
7072 tree gnu_result = gnu_list;
7074 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
7075 gnu_field = TREE_CHAIN (gnu_field))
7077 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7078 DECL_FIELD_BIT_OFFSET (gnu_field));
7079 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7080 DECL_FIELD_OFFSET (gnu_field));
7081 unsigned int our_offset_align
7082 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7085 = tree_cons (gnu_field,
7086 tree_cons (gnu_our_offset,
7087 tree_cons (size_int (our_offset_align),
7088 gnu_our_bitpos, NULL_TREE),
7092 if (DECL_INTERNAL_P (gnu_field))
7094 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
7095 gnu_our_offset, gnu_our_bitpos,
7102 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7103 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7104 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7105 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7106 for the size of a field. COMPONENT_P is true if we are being called
7107 to process the Component_Size of GNAT_OBJECT. This is used for error
7108 message handling and to indicate to use the object size of GNU_TYPE.
7109 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7110 it means that a size of zero should be treated as an unspecified size. */
7113 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7114 enum tree_code kind, bool component_p, bool zero_ok)
7116 Node_Id gnat_error_node;
7117 tree type_size, size;
7119 if (kind == VAR_DECL
7120 /* If a type needs strict alignment, a component of this type in
7121 a packed record cannot be packed and thus uses the type size. */
7122 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7123 type_size = TYPE_SIZE (gnu_type);
7125 type_size = rm_size (gnu_type);
7127 /* Find the node to use for errors. */
7128 if ((Ekind (gnat_object) == E_Component
7129 || Ekind (gnat_object) == E_Discriminant)
7130 && Present (Component_Clause (gnat_object)))
7131 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7132 else if (Present (Size_Clause (gnat_object)))
7133 gnat_error_node = Expression (Size_Clause (gnat_object));
7135 gnat_error_node = gnat_object;
7137 /* Return 0 if no size was specified, either because Esize was not Present
7138 or the specified size was zero. */
7139 if (No (uint_size) || uint_size == No_Uint)
7142 /* Get the size as a tree. Issue an error if a size was specified but
7143 cannot be represented in sizetype. */
7144 size = UI_To_gnu (uint_size, bitsizetype);
7145 if (TREE_OVERFLOW (size))
7147 post_error_ne (component_p ? "component size of & is too large"
7148 : "size of & is too large",
7149 gnat_error_node, gnat_object);
7153 /* Ignore a negative size since that corresponds to our back-annotation.
7154 Also ignore a zero size if it is not permitted. */
7155 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7158 /* The size of objects is always a multiple of a byte. */
7159 if (kind == VAR_DECL
7160 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7163 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7164 gnat_error_node, gnat_object);
7166 post_error_ne ("size for& is not a multiple of Storage_Unit",
7167 gnat_error_node, gnat_object);
7171 /* If this is an integral type or a packed array type, the front-end has
7172 verified the size, so we need not do it here (which would entail
7173 checking against the bounds). However, if this is an aliased object,
7174 it may not be smaller than the type of the object. */
7175 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7176 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7179 /* If the object is a record that contains a template, add the size of
7180 the template to the specified size. */
7181 if (TREE_CODE (gnu_type) == RECORD_TYPE
7182 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7183 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7185 /* Modify the size of the type to be that of the maximum size if it has a
7187 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7188 type_size = max_size (type_size, true);
7190 /* If this is an access type or a fat pointer, the minimum size is that given
7191 by the smallest integral mode that's valid for pointers. */
7192 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7194 enum machine_mode p_mode;
7196 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7197 !targetm.valid_pointer_mode (p_mode);
7198 p_mode = GET_MODE_WIDER_MODE (p_mode))
7201 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7204 /* If the size of the object is a constant, the new size must not be
7206 if (TREE_CODE (type_size) != INTEGER_CST
7207 || TREE_OVERFLOW (type_size)
7208 || tree_int_cst_lt (size, type_size))
7212 ("component size for& too small{, minimum allowed is ^}",
7213 gnat_error_node, gnat_object, type_size);
7215 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7216 gnat_error_node, gnat_object, type_size);
7218 if (kind == VAR_DECL && !component_p
7219 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7220 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7221 post_error_ne_tree_2
7222 ("\\size of ^ is not a multiple of alignment (^ bits)",
7223 gnat_error_node, gnat_object, rm_size (gnu_type),
7224 TYPE_ALIGN (gnu_type));
7226 else if (INTEGRAL_TYPE_P (gnu_type))
7227 post_error_ne ("\\size would be legal if & were not aliased!",
7228 gnat_error_node, gnat_object);
7236 /* Similarly, but both validate and process a value of RM size. This
7237 routine is only called for types. */
7240 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7242 /* Only issue an error if a Value_Size clause was explicitly given.
7243 Otherwise, we'd be duplicating an error on the Size clause. */
7244 Node_Id gnat_attr_node
7245 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7246 tree old_size = rm_size (gnu_type), size;
7248 /* Do nothing if no size was specified, either because RM size was not
7249 Present or if the specified size was zero. */
7250 if (No (uint_size) || uint_size == No_Uint)
7253 /* Get the size as a tree. Issue an error if a size was specified but
7254 cannot be represented in sizetype. */
7255 size = UI_To_gnu (uint_size, bitsizetype);
7256 if (TREE_OVERFLOW (size))
7258 if (Present (gnat_attr_node))
7259 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7264 /* Ignore a negative size since that corresponds to our back-annotation.
7265 Also ignore a zero size unless a Value_Size clause exists, or a size
7266 clause exists, or this is an integer type, in which case the front-end
7267 will have always set it. */
7268 if (tree_int_cst_sgn (size) < 0
7269 || (integer_zerop (size)
7270 && No (gnat_attr_node)
7271 && !Has_Size_Clause (gnat_entity)
7272 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7275 /* If the old size is self-referential, get the maximum size. */
7276 if (CONTAINS_PLACEHOLDER_P (old_size))
7277 old_size = max_size (old_size, true);
7279 /* If the size of the object is a constant, the new size must not be
7280 smaller (the front-end checks this for scalar types). */
7281 if (TREE_CODE (old_size) != INTEGER_CST
7282 || TREE_OVERFLOW (old_size)
7283 || (AGGREGATE_TYPE_P (gnu_type) && tree_int_cst_lt (size, old_size)))
7285 if (Present (gnat_attr_node))
7287 ("Value_Size for& too small{, minimum allowed is ^}",
7288 gnat_attr_node, gnat_entity, old_size);
7292 /* Otherwise, set the RM size proper for numerical types... */
7293 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7294 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7295 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7296 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7297 TYPE_RM_SIZE (gnu_type) = size;
7299 /* ...or the Ada size for record and union types. */
7300 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7301 || TREE_CODE (gnu_type) == UNION_TYPE
7302 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7303 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7304 SET_TYPE_ADA_SIZE (gnu_type, size);
7307 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7308 If TYPE is the best type, return it. Otherwise, make a new type. We
7309 only support new integral and pointer types. FOR_BIASED is true if
7310 we are making a biased type. */
7313 make_type_from_size (tree type, tree size_tree, bool for_biased)
7315 unsigned HOST_WIDE_INT size;
7319 /* If size indicates an error, just return TYPE to avoid propagating
7320 the error. Likewise if it's too large to represent. */
7321 if (!size_tree || !host_integerp (size_tree, 1))
7324 size = tree_low_cst (size_tree, 1);
7326 switch (TREE_CODE (type))
7331 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7332 && TYPE_BIASED_REPRESENTATION_P (type));
7334 /* Only do something if the type is not a packed array type and
7335 doesn't already have the proper size. */
7336 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7337 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7340 biased_p |= for_biased;
7341 size = MIN (size, LONG_LONG_TYPE_SIZE);
7343 if (TYPE_UNSIGNED (type) || biased_p)
7344 new_type = make_unsigned_type (size);
7346 new_type = make_signed_type (size);
7347 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7348 TYPE_MIN_VALUE (new_type)
7349 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
7350 TYPE_MAX_VALUE (new_type)
7351 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
7352 /* Propagate the name to avoid creating a fake subrange type. */
7353 if (TYPE_NAME (type))
7355 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7356 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7358 TYPE_NAME (new_type) = TYPE_NAME (type);
7360 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7361 TYPE_RM_SIZE (new_type) = bitsize_int (size);
7365 /* Do something if this is a fat pointer, in which case we
7366 may need to return the thin pointer. */
7367 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7369 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7370 if (!targetm.valid_pointer_mode (p_mode))
7373 build_pointer_type_for_mode
7374 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7380 /* Only do something if this is a thin pointer, in which case we
7381 may need to return the fat pointer. */
7382 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7384 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7394 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7395 a type or object whose present alignment is ALIGN. If this alignment is
7396 valid, return it. Otherwise, give an error and return ALIGN. */
7399 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7401 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7402 unsigned int new_align;
7403 Node_Id gnat_error_node;
7405 /* Don't worry about checking alignment if alignment was not specified
7406 by the source program and we already posted an error for this entity. */
7407 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7410 /* Post the error on the alignment clause if any. */
7411 if (Present (Alignment_Clause (gnat_entity)))
7412 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7414 gnat_error_node = gnat_entity;
7416 /* Within GCC, an alignment is an integer, so we must make sure a value is
7417 specified that fits in that range. Also, there is an upper bound to
7418 alignments we can support/allow. */
7419 if (!UI_Is_In_Int_Range (alignment)
7420 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7421 post_error_ne_num ("largest supported alignment for& is ^",
7422 gnat_error_node, gnat_entity, max_allowed_alignment);
7423 else if (!(Present (Alignment_Clause (gnat_entity))
7424 && From_At_Mod (Alignment_Clause (gnat_entity)))
7425 && new_align * BITS_PER_UNIT < align)
7426 post_error_ne_num ("alignment for& must be at least ^",
7427 gnat_error_node, gnat_entity,
7428 align / BITS_PER_UNIT);
7431 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7432 if (new_align > align)
7439 /* Return the smallest alignment not less than SIZE. */
7442 ceil_alignment (unsigned HOST_WIDE_INT size)
7444 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7447 /* Verify that OBJECT, a type or decl, is something we can implement
7448 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7449 if we require atomic components. */
7452 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7454 Node_Id gnat_error_point = gnat_entity;
7456 enum machine_mode mode;
7460 /* There are three case of what OBJECT can be. It can be a type, in which
7461 case we take the size, alignment and mode from the type. It can be a
7462 declaration that was indirect, in which case the relevant values are
7463 that of the type being pointed to, or it can be a normal declaration,
7464 in which case the values are of the decl. The code below assumes that
7465 OBJECT is either a type or a decl. */
7466 if (TYPE_P (object))
7468 mode = TYPE_MODE (object);
7469 align = TYPE_ALIGN (object);
7470 size = TYPE_SIZE (object);
7472 else if (DECL_BY_REF_P (object))
7474 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7475 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7476 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7480 mode = DECL_MODE (object);
7481 align = DECL_ALIGN (object);
7482 size = DECL_SIZE (object);
7485 /* Consider all floating-point types atomic and any types that that are
7486 represented by integers no wider than a machine word. */
7487 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7488 || ((GET_MODE_CLASS (mode) == MODE_INT
7489 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7490 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7493 /* For the moment, also allow anything that has an alignment equal
7494 to its size and which is smaller than a word. */
7495 if (size && TREE_CODE (size) == INTEGER_CST
7496 && compare_tree_int (size, align) == 0
7497 && align <= BITS_PER_WORD)
7500 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7501 gnat_node = Next_Rep_Item (gnat_node))
7503 if (!comp_p && Nkind (gnat_node) == N_Pragma
7504 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7506 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7507 else if (comp_p && Nkind (gnat_node) == N_Pragma
7508 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7509 == Pragma_Atomic_Components))
7510 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7514 post_error_ne ("atomic access to component of & cannot be guaranteed",
7515 gnat_error_point, gnat_entity);
7517 post_error_ne ("atomic access to & cannot be guaranteed",
7518 gnat_error_point, gnat_entity);
7521 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7522 have compatible signatures so that a call using one type may be safely
7523 issued if the actual target function type is the other. Return 1 if it is
7524 the case, 0 otherwise, and post errors on the incompatibilities.
7526 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7527 that calls to the subprogram will have arguments suitable for the later
7528 underlying builtin expansion. */
7531 compatible_signatures_p (tree ftype1, tree ftype2)
7533 /* As of now, we only perform very trivial tests and consider it's the
7534 programmer's responsibility to ensure the type correctness in the Ada
7535 declaration, as in the regular Import cases.
7537 Mismatches typically result in either error messages from the builtin
7538 expander, internal compiler errors, or in a real call sequence. This
7539 should be refined to issue diagnostics helping error detection and
7542 /* Almost fake test, ensuring a use of each argument. */
7543 if (ftype1 == ftype2)
7549 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
7550 type with all size expressions that contain F in a PLACEHOLDER_EXPR
7551 updated by replacing F with R.
7553 The function doesn't update the layout of the type, i.e. it assumes
7554 that the substitution is purely formal. That's why the replacement
7555 value R must itself contain a PLACEHOLDER_EXPR. */
7558 substitute_in_type (tree t, tree f, tree r)
7562 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
7564 switch (TREE_CODE (t))
7569 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7570 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7572 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7573 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7575 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7578 new = build_range_type (TREE_TYPE (t), low, high);
7579 if (TYPE_INDEX_TYPE (t))
7581 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7588 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7589 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7591 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7592 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7594 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7597 new = copy_type (t);
7598 TYPE_MIN_VALUE (new) = low;
7599 TYPE_MAX_VALUE (new) = high;
7606 new = substitute_in_type (TREE_TYPE (t), f, r);
7607 if (new == TREE_TYPE (t))
7610 return build_complex_type (new);
7616 /* These should never show up here. */
7621 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7622 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7624 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7627 new = build_array_type (component, domain);
7628 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7629 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7630 SET_TYPE_MODE (new, TYPE_MODE (t));
7631 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7632 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7633 TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t);
7634 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7635 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7641 case QUAL_UNION_TYPE:
7643 bool changed_field = false;
7646 /* Start out with no fields, make new fields, and chain them
7647 in. If we haven't actually changed the type of any field,
7648 discard everything we've done and return the old type. */
7649 new = copy_type (t);
7650 TYPE_FIELDS (new) = NULL_TREE;
7652 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7654 tree new_field = copy_node (field), new_n;
7656 new_n = substitute_in_type (TREE_TYPE (field), f, r);
7657 if (new_n != TREE_TYPE (field))
7659 TREE_TYPE (new_field) = new_n;
7660 changed_field = true;
7663 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
7664 if (new_n != DECL_FIELD_OFFSET (field))
7666 DECL_FIELD_OFFSET (new_field) = new_n;
7667 changed_field = true;
7670 /* Do the substitution inside the qualifier, if any. */
7671 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7673 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7674 if (new_n != DECL_QUALIFIER (field))
7676 DECL_QUALIFIER (new_field) = new_n;
7677 changed_field = true;
7681 DECL_CONTEXT (new_field) = new;
7682 SET_DECL_ORIGINAL_FIELD (new_field,
7683 (DECL_ORIGINAL_FIELD (field)
7684 ? DECL_ORIGINAL_FIELD (field) : field));
7686 TREE_CHAIN (new_field) = TYPE_FIELDS (new);
7687 TYPE_FIELDS (new) = new_field;
7693 TYPE_FIELDS (new) = nreverse (TYPE_FIELDS (new));
7694 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7695 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7696 SET_TYPE_ADA_SIZE (new, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
7705 /* Return the RM size of GNU_TYPE. This is the actual number of bits
7706 needed to represent the object. */
7709 rm_size (tree gnu_type)
7711 /* For integer types, this is the precision. */
7712 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7713 return TYPE_RM_SIZE (gnu_type);
7715 /* Return the RM size of the actual data plus the size of the template. */
7716 if (TREE_CODE (gnu_type) == RECORD_TYPE
7717 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7719 size_binop (PLUS_EXPR,
7720 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7721 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7723 /* For record types, we store the size explicitly. */
7724 if ((TREE_CODE (gnu_type) == RECORD_TYPE
7725 || TREE_CODE (gnu_type) == UNION_TYPE
7726 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7727 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7728 && TYPE_ADA_SIZE (gnu_type))
7729 return TYPE_ADA_SIZE (gnu_type);
7731 /* For other types, this is just the size. */
7732 return TYPE_SIZE (gnu_type);
7735 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7736 fully-qualified name, possibly with type information encoding.
7737 Otherwise, return the name. */
7740 get_entity_name (Entity_Id gnat_entity)
7742 Get_Encoded_Name (gnat_entity);
7743 return get_identifier_with_length (Name_Buffer, Name_Len);
7746 /* Return an identifier representing the external name to be used for
7747 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7748 and the specified suffix. */
7751 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7753 Entity_Kind kind = Ekind (gnat_entity);
7757 String_Template temp = {1, strlen (suffix)};
7758 Fat_Pointer fp = {suffix, &temp};
7759 Get_External_Name_With_Suffix (gnat_entity, fp);
7762 Get_External_Name (gnat_entity, 0);
7764 /* A variable using the Stdcall convention lives in a DLL. We adjust
7765 its name to use the jump table, the _imp__NAME contains the address
7766 for the NAME variable. */
7767 if ((kind == E_Variable || kind == E_Constant)
7768 && Has_Stdcall_Convention (gnat_entity))
7770 const int len = 6 + Name_Len;
7771 char *new_name = (char *) alloca (len + 1);
7772 strcpy (new_name, "_imp__");
7773 strcat (new_name, Name_Buffer);
7774 return get_identifier_with_length (new_name, len);
7777 return get_identifier_with_length (Name_Buffer, Name_Len);
7780 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
7781 string, return a new IDENTIFIER_NODE that is the concatenation of
7782 the name followed by "___" and the specified suffix. */
7785 concat_name (tree gnu_name, const char *suffix)
7787 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
7788 char *new_name = (char *) alloca (len + 1);
7789 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
7790 strcat (new_name, "___");
7791 strcat (new_name, suffix);
7792 return get_identifier_with_length (new_name, len);
7795 #include "gt-ada-decl.h"