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 Entity_Id gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
177 Entity_Kind kind = Ekind (gnat_entity);
178 /* Contains the GCC DECL node which is equivalent to the input GNAT node.
179 This node will be associated with the GNAT node by calling at the end
180 of the `switch' statement. */
181 tree gnu_decl = NULL_TREE;
182 /* Contains the GCC type to be used for the GCC node. */
183 tree gnu_type = NULL_TREE;
184 /* Contains the GCC size tree to be used for the GCC node. */
185 tree gnu_size = NULL_TREE;
186 /* Contains the GCC name to be used for the GCC node. */
188 /* True if we have already saved gnu_decl as a GNAT association. */
190 /* True if we incremented defer_incomplete_level. */
191 bool this_deferred = false;
192 /* True if we incremented force_global. */
193 bool this_global = false;
194 /* True if we should check to see if elaborated during processing. */
195 bool maybe_present = false;
196 /* True if we made GNU_DECL and its type here. */
197 bool this_made_decl = false;
198 /* True if debug info is requested for this entity. */
199 bool debug_info_p = (Needs_Debug_Info (gnat_entity)
200 || debug_info_level == DINFO_LEVEL_VERBOSE);
201 /* True if this entity is to be considered as imported. */
202 bool imported_p = (Is_Imported (gnat_entity)
203 && No (Address_Clause (gnat_entity)));
204 unsigned int esize, align = 0;
205 struct attrib *attr_list = NULL;
207 /* First compute a default value for the size of the entity. */
208 if (Known_Esize (gnat_entity) && UI_Is_In_Int_Range (Esize (gnat_entity)))
210 unsigned int max_esize;
211 esize = UI_To_Int (Esize (gnat_entity));
213 if (IN (kind, Float_Kind))
214 max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
215 else if (IN (kind, Access_Kind))
216 max_esize = POINTER_SIZE * 2;
218 max_esize = LONG_LONG_TYPE_SIZE;
220 esize = MIN (esize, max_esize);
223 esize = LONG_LONG_TYPE_SIZE;
225 /* Since a use of an Itype is a definition, process it as such if it
226 is not in a with'ed unit. */
228 && Is_Itype (gnat_entity)
229 && !present_gnu_tree (gnat_entity)
230 && In_Extended_Main_Code_Unit (gnat_entity))
232 /* Ensure that we are in a subprogram mentioned in the Scope chain of
233 this entity, our current scope is global, or we encountered a task
234 or entry (where we can't currently accurately check scoping). */
235 if (!current_function_decl
236 || DECL_ELABORATION_PROC_P (current_function_decl))
238 process_type (gnat_entity);
239 return get_gnu_tree (gnat_entity);
242 for (gnat_temp = Scope (gnat_entity);
244 gnat_temp = Scope (gnat_temp))
246 if (Is_Type (gnat_temp))
247 gnat_temp = Underlying_Type (gnat_temp);
249 if (Ekind (gnat_temp) == E_Subprogram_Body)
251 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
253 if (IN (Ekind (gnat_temp), Subprogram_Kind)
254 && Present (Protected_Body_Subprogram (gnat_temp)))
255 gnat_temp = Protected_Body_Subprogram (gnat_temp);
257 if (Ekind (gnat_temp) == E_Entry
258 || Ekind (gnat_temp) == E_Entry_Family
259 || Ekind (gnat_temp) == E_Task_Type
260 || (IN (Ekind (gnat_temp), Subprogram_Kind)
261 && present_gnu_tree (gnat_temp)
262 && (current_function_decl
263 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
265 process_type (gnat_entity);
266 return get_gnu_tree (gnat_entity);
270 /* This abort means the entity has an incorrect scope, i.e. that its
271 scope does not correspond to the subprogram it is declared in. */
275 /* If the entiy is not present, something went badly wrong. */
276 gcc_assert (Present (gnat_entity));
278 /* If we've already processed this entity, return what we got last time.
279 If we are defining the node, we should not have already processed it.
280 In that case, we will abort below when we try to save a new GCC tree
281 for this object. We also need to handle the case of getting a dummy
282 type when a Full_View exists. */
283 if (present_gnu_tree (gnat_entity)
284 && (!definition || (Is_Type (gnat_entity) && imported_p)))
286 gnu_decl = get_gnu_tree (gnat_entity);
288 if (TREE_CODE (gnu_decl) == TYPE_DECL
289 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
290 && IN (kind, Incomplete_Or_Private_Kind)
291 && Present (Full_View (gnat_entity)))
294 = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0);
295 save_gnu_tree (gnat_entity, NULL_TREE, false);
296 save_gnu_tree (gnat_entity, gnu_decl, false);
302 /* If this is a numeric or enumeral type, or an access type, a nonzero
303 Esize must be specified unless it was specified by the programmer. */
304 gcc_assert (!Unknown_Esize (gnat_entity)
305 || Has_Size_Clause (gnat_entity)
306 || (!IN (kind, Numeric_Kind)
307 && !IN (kind, Enumeration_Kind)
308 && (!IN (kind, Access_Kind)
309 || kind == E_Access_Protected_Subprogram_Type
310 || kind == E_Anonymous_Access_Protected_Subprogram_Type
311 || kind == E_Access_Subtype)));
313 /* The RM size must be specified for all discrete and fixed-point types. */
314 gcc_assert (!IN (kind, Discrete_Or_Fixed_Point_Kind)
315 || !Unknown_RM_Size (gnat_entity));
317 /* Get the name of the entity and set up the line number and filename of
318 the original definition for use in any decl we make. */
319 gnu_entity_id = get_entity_name (gnat_entity);
320 Sloc_to_locus (Sloc (gnat_entity), &input_location);
322 /* If we get here, it means we have not yet done anything with this
323 entity. If we are not defining it here, it must be external,
324 otherwise we should have defined it already. */
325 gcc_assert (definition || Is_Public (gnat_entity) || type_annotate_only
326 || kind == E_Discriminant || kind == E_Component
328 || (kind == E_Constant && Present (Full_View (gnat_entity)))
329 || IN (kind, Type_Kind));
331 /* For cases when we are not defining (i.e., we are referencing from
332 another compilation unit) public entities, show we are at global level
333 for the purpose of computing scopes. Don't do this for components or
334 discriminants since the relevant test is whether or not the record is
337 && Is_Public (gnat_entity)
338 && !Is_Statically_Allocated (gnat_entity)
339 && kind != E_Component
340 && kind != E_Discriminant)
341 force_global++, this_global = true;
343 /* Handle any attributes directly attached to the entity. */
344 if (Has_Gigi_Rep_Item (gnat_entity))
345 prepend_attributes (gnat_entity, &attr_list);
347 /* Machine_Attributes on types are expected to be propagated to subtypes.
348 The corresponding Gigi_Rep_Items are only attached to the first subtype
349 though, so we handle the propagation here. */
350 if (Is_Type (gnat_entity) && Base_Type (gnat_entity) != gnat_entity
351 && !Is_First_Subtype (gnat_entity)
352 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
353 prepend_attributes (First_Subtype (Base_Type (gnat_entity)), &attr_list);
358 /* If this is a use of a deferred constant without address clause,
359 get its full definition. */
361 && No (Address_Clause (gnat_entity))
362 && Present (Full_View (gnat_entity)))
365 = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
370 /* If we have an external constant that we are not defining, get the
371 expression that is was defined to represent. We may throw that
372 expression away later if it is not a constant. Do not retrieve the
373 expression if it is an aggregate or allocator, because in complex
374 instantiation contexts it may not be expanded */
376 && Present (Expression (Declaration_Node (gnat_entity)))
377 && !No_Initialization (Declaration_Node (gnat_entity))
378 && (Nkind (Expression (Declaration_Node (gnat_entity)))
380 && (Nkind (Expression (Declaration_Node (gnat_entity)))
382 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
384 /* Ignore deferred constant definitions without address clause since
385 they are processed fully in the front-end. If No_Initialization
386 is set, this is not a deferred constant but a constant whose value
387 is built manually. And constants that are renamings are handled
391 && No (Address_Clause (gnat_entity))
392 && !No_Initialization (Declaration_Node (gnat_entity))
393 && No (Renamed_Object (gnat_entity)))
395 gnu_decl = error_mark_node;
400 /* Ignore constant definitions already marked with the error node. See
401 the N_Object_Declaration case of gnat_to_gnu for the rationale. */
404 && present_gnu_tree (gnat_entity)
405 && get_gnu_tree (gnat_entity) == error_mark_node)
407 maybe_present = true;
414 /* We used to special case VMS exceptions here to directly map them to
415 their associated condition code. Since this code had to be masked
416 dynamically to strip off the severity bits, this caused trouble in
417 the GCC/ZCX case because the "type" pointers we store in the tables
418 have to be static. We now don't special case here anymore, and let
419 the regular processing take place, which leaves us with a regular
420 exception data object for VMS exceptions too. The condition code
421 mapping is taken care of by the front end and the bitmasking by the
428 /* The GNAT record where the component was defined. */
429 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
431 /* If the variable is an inherited record component (in the case of
432 extended record types), just return the inherited entity, which
433 must be a FIELD_DECL. Likewise for discriminants.
434 For discriminants of untagged records which have explicit
435 stored discriminants, return the entity for the corresponding
436 stored discriminant. Also use Original_Record_Component
437 if the record has a private extension. */
438 if (Present (Original_Record_Component (gnat_entity))
439 && Original_Record_Component (gnat_entity) != gnat_entity)
442 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
443 gnu_expr, definition);
448 /* If the enclosing record has explicit stored discriminants,
449 then it is an untagged record. If the Corresponding_Discriminant
450 is not empty then this must be a renamed discriminant and its
451 Original_Record_Component must point to the corresponding explicit
452 stored discriminant (i.e. we should have taken the previous
454 else if (Present (Corresponding_Discriminant (gnat_entity))
455 && Is_Tagged_Type (gnat_record))
457 /* A tagged record has no explicit stored discriminants. */
458 gcc_assert (First_Discriminant (gnat_record)
459 == First_Stored_Discriminant (gnat_record));
461 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
462 gnu_expr, definition);
467 else if (Present (CR_Discriminant (gnat_entity))
468 && type_annotate_only)
470 gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
471 gnu_expr, definition);
476 /* If the enclosing record has explicit stored discriminants, then
477 it is an untagged record. If the Corresponding_Discriminant
478 is not empty then this must be a renamed discriminant and its
479 Original_Record_Component must point to the corresponding explicit
480 stored discriminant (i.e. we should have taken the first
482 else if (Present (Corresponding_Discriminant (gnat_entity))
483 && (First_Discriminant (gnat_record)
484 != First_Stored_Discriminant (gnat_record)))
487 /* Otherwise, if we are not defining this and we have no GCC type
488 for the containing record, make one for it. Then we should
489 have made our own equivalent. */
490 else if (!definition && !present_gnu_tree (gnat_record))
492 /* ??? If this is in a record whose scope is a protected
493 type and we have an Original_Record_Component, use it.
494 This is a workaround for major problems in protected type
496 Entity_Id Scop = Scope (Scope (gnat_entity));
497 if ((Is_Protected_Type (Scop)
498 || (Is_Private_Type (Scop)
499 && Present (Full_View (Scop))
500 && Is_Protected_Type (Full_View (Scop))))
501 && Present (Original_Record_Component (gnat_entity)))
504 = gnat_to_gnu_entity (Original_Record_Component
511 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
512 gnu_decl = get_gnu_tree (gnat_entity);
518 /* Here we have no GCC type and this is a reference rather than a
519 definition. This should never happen. Most likely the cause is
520 reference before declaration in the gnat tree for gnat_entity. */
524 case E_Loop_Parameter:
525 case E_Out_Parameter:
528 /* Simple variables, loop variables, Out parameters, and exceptions. */
531 bool used_by_ref = false;
533 = ((kind == E_Constant || kind == E_Variable)
534 && Is_True_Constant (gnat_entity)
535 && !Treat_As_Volatile (gnat_entity)
536 && (((Nkind (Declaration_Node (gnat_entity))
537 == N_Object_Declaration)
538 && Present (Expression (Declaration_Node (gnat_entity))))
539 || Present (Renamed_Object (gnat_entity))));
540 bool inner_const_flag = const_flag;
541 bool static_p = Is_Statically_Allocated (gnat_entity);
542 bool mutable_p = false;
543 tree gnu_ext_name = NULL_TREE;
544 tree renamed_obj = NULL_TREE;
545 tree gnu_object_size;
547 if (Present (Renamed_Object (gnat_entity)) && !definition)
549 if (kind == E_Exception)
550 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
553 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
556 /* Get the type after elaborating the renamed object. */
557 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
559 /* For a debug renaming declaration, build a pure debug entity. */
560 if (Present (Debug_Renaming_Link (gnat_entity)))
563 gnu_decl = build_decl (VAR_DECL, gnu_entity_id, gnu_type);
564 /* The (MEM (CONST (0))) pattern is prescribed by STABS. */
565 if (global_bindings_p ())
566 addr = gen_rtx_CONST (VOIDmode, const0_rtx);
568 addr = stack_pointer_rtx;
569 SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
570 gnat_pushdecl (gnu_decl, gnat_entity);
574 /* If this is a loop variable, its type should be the base type.
575 This is because the code for processing a loop determines whether
576 a normal loop end test can be done by comparing the bounds of the
577 loop against those of the base type, which is presumed to be the
578 size used for computation. But this is not correct when the size
579 of the subtype is smaller than the type. */
580 if (kind == E_Loop_Parameter)
581 gnu_type = get_base_type (gnu_type);
583 /* Reject non-renamed objects whose types are unconstrained arrays or
584 any object whose type is a dummy type or VOID_TYPE. */
586 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
587 && No (Renamed_Object (gnat_entity)))
588 || TYPE_IS_DUMMY_P (gnu_type)
589 || TREE_CODE (gnu_type) == VOID_TYPE)
591 gcc_assert (type_annotate_only);
594 return error_mark_node;
597 /* If an alignment is specified, use it if valid. Note that
598 exceptions are objects but don't have alignments. We must do this
599 before we validate the size, since the alignment can affect the
601 if (kind != E_Exception && Known_Alignment (gnat_entity))
603 gcc_assert (Present (Alignment (gnat_entity)));
604 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
605 TYPE_ALIGN (gnu_type));
606 gnu_type = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
607 "PAD", false, definition, true);
610 /* If we are defining the object, see if it has a Size value and
611 validate it if so. If we are not defining the object and a Size
612 clause applies, simply retrieve the value. We don't want to ignore
613 the clause and it is expected to have been validated already. Then
614 get the new type, if any. */
616 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
617 gnat_entity, VAR_DECL, false,
618 Has_Size_Clause (gnat_entity));
619 else if (Has_Size_Clause (gnat_entity))
620 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
625 = make_type_from_size (gnu_type, gnu_size,
626 Has_Biased_Representation (gnat_entity));
628 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
629 gnu_size = NULL_TREE;
632 /* If this object has self-referential size, it must be a record with
633 a default value. We are supposed to allocate an object of the
634 maximum size in this case unless it is a constant with an
635 initializing expression, in which case we can get the size from
636 that. Note that the resulting size may still be a variable, so
637 this may end up with an indirect allocation. */
638 if (No (Renamed_Object (gnat_entity))
639 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
641 if (gnu_expr && kind == E_Constant)
643 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
644 if (CONTAINS_PLACEHOLDER_P (size))
646 /* If the initializing expression is itself a constant,
647 despite having a nominal type with self-referential
648 size, we can get the size directly from it. */
649 if (TREE_CODE (gnu_expr) == COMPONENT_REF
650 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
653 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
654 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
655 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
656 || DECL_READONLY_ONCE_ELAB
657 (TREE_OPERAND (gnu_expr, 0))))
658 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
661 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
666 /* We may have no GNU_EXPR because No_Initialization is
667 set even though there's an Expression. */
668 else if (kind == E_Constant
669 && (Nkind (Declaration_Node (gnat_entity))
670 == N_Object_Declaration)
671 && Present (Expression (Declaration_Node (gnat_entity))))
673 = TYPE_SIZE (gnat_to_gnu_type
675 (Expression (Declaration_Node (gnat_entity)))));
678 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
683 /* If the size is zero bytes, make it one byte since some linkers have
684 trouble with zero-sized objects. If the object will have a
685 template, that will make it nonzero so don't bother. Also avoid
686 doing that for an object renaming or an object with an address
687 clause, as we would lose useful information on the view size
688 (e.g. for null array slices) and we are not allocating the object
691 && integer_zerop (gnu_size)
692 && !TREE_OVERFLOW (gnu_size))
693 || (TYPE_SIZE (gnu_type)
694 && integer_zerop (TYPE_SIZE (gnu_type))
695 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
696 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
697 || !Is_Array_Type (Etype (gnat_entity)))
698 && !Present (Renamed_Object (gnat_entity))
699 && !Present (Address_Clause (gnat_entity)))
700 gnu_size = bitsize_unit_node;
702 /* If this is an object with no specified size and alignment, and
703 if either it is atomic or we are not optimizing alignment for
704 space and it is composite and not an exception, an Out parameter
705 or a reference to another object, and the size of its type is a
706 constant, set the alignment to the smallest one which is not
707 smaller than the size, with an appropriate cap. */
708 if (!gnu_size && align == 0
709 && (Is_Atomic (gnat_entity)
710 || (!Optimize_Alignment_Space (gnat_entity)
711 && kind != E_Exception
712 && kind != E_Out_Parameter
713 && Is_Composite_Type (Etype (gnat_entity))
714 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
716 && No (Renamed_Object (gnat_entity))
717 && No (Address_Clause (gnat_entity))))
718 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
720 /* No point in jumping through all the hoops needed in order
721 to support BIGGEST_ALIGNMENT if we don't really have to.
722 So we cap to the smallest alignment that corresponds to
723 a known efficient memory access pattern of the target. */
724 unsigned int align_cap = Is_Atomic (gnat_entity)
726 : get_mode_alignment (ptr_mode);
728 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
729 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
732 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
734 /* But make sure not to under-align the object. */
735 if (align <= TYPE_ALIGN (gnu_type))
738 /* And honor the minimum valid atomic alignment, if any. */
739 #ifdef MINIMUM_ATOMIC_ALIGNMENT
740 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
741 align = MINIMUM_ATOMIC_ALIGNMENT;
745 /* If the object is set to have atomic components, find the component
746 type and validate it.
748 ??? Note that we ignore Has_Volatile_Components on objects; it's
749 not at all clear what to do in that case. */
751 if (Has_Atomic_Components (gnat_entity))
753 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
754 ? TREE_TYPE (gnu_type) : gnu_type);
756 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
757 && TYPE_MULTI_ARRAY_P (gnu_inner))
758 gnu_inner = TREE_TYPE (gnu_inner);
760 check_ok_for_atomic (gnu_inner, gnat_entity, true);
763 /* Now check if the type of the object allows atomic access. Note
764 that we must test the type, even if this object has size and
765 alignment to allow such access, because we will be going
766 inside the padded record to assign to the object. We could fix
767 this by always copying via an intermediate value, but it's not
768 clear it's worth the effort. */
769 if (Is_Atomic (gnat_entity))
770 check_ok_for_atomic (gnu_type, gnat_entity, false);
772 /* If this is an aliased object with an unconstrained nominal subtype,
773 make a type that includes the template. */
774 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
775 && Is_Array_Type (Etype (gnat_entity))
776 && !type_annotate_only)
779 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
782 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
783 concat_id_with_name (gnu_entity_id,
787 #ifdef MINIMUM_ATOMIC_ALIGNMENT
788 /* If the size is a constant and no alignment is specified, force
789 the alignment to be the minimum valid atomic alignment. The
790 restriction on constant size avoids problems with variable-size
791 temporaries; if the size is variable, there's no issue with
792 atomic access. Also don't do this for a constant, since it isn't
793 necessary and can interfere with constant replacement. Finally,
794 do not do it for Out parameters since that creates an
795 size inconsistency with In parameters. */
796 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
797 && !FLOAT_TYPE_P (gnu_type)
798 && !const_flag && No (Renamed_Object (gnat_entity))
799 && !imported_p && No (Address_Clause (gnat_entity))
800 && kind != E_Out_Parameter
801 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
802 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
803 align = MINIMUM_ATOMIC_ALIGNMENT;
806 /* Make a new type with the desired size and alignment, if needed.
807 But do not take into account alignment promotions to compute the
808 size of the object. */
809 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
810 if (gnu_size || align > 0)
811 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
812 "PAD", false, definition,
813 gnu_size ? true : false);
815 /* If this is a renaming, avoid as much as possible to create a new
816 object. However, in several cases, creating it is required.
817 This processing needs to be applied to the raw expression so
818 as to make it more likely to rename the underlying object. */
819 if (Present (Renamed_Object (gnat_entity)))
821 bool create_normal_object = false;
823 /* If the renamed object had padding, strip off the reference
824 to the inner object and reset our type. */
825 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
826 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
828 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
829 /* Strip useless conversions around the object. */
830 || (TREE_CODE (gnu_expr) == NOP_EXPR
831 && gnat_types_compatible_p
832 (TREE_TYPE (gnu_expr),
833 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
835 gnu_expr = TREE_OPERAND (gnu_expr, 0);
836 gnu_type = TREE_TYPE (gnu_expr);
839 /* Case 1: If this is a constant renaming stemming from a function
840 call, treat it as a normal object whose initial value is what
841 is being renamed. RM 3.3 says that the result of evaluating a
842 function call is a constant object. As a consequence, it can
843 be the inner object of a constant renaming. In this case, the
844 renaming must be fully instantiated, i.e. it cannot be a mere
845 reference to (part of) an existing object. */
848 tree inner_object = gnu_expr;
849 while (handled_component_p (inner_object))
850 inner_object = TREE_OPERAND (inner_object, 0);
851 if (TREE_CODE (inner_object) == CALL_EXPR)
852 create_normal_object = true;
855 /* Otherwise, see if we can proceed with a stabilized version of
856 the renamed entity or if we need to make a new object. */
857 if (!create_normal_object)
859 tree maybe_stable_expr = NULL_TREE;
862 /* Case 2: If the renaming entity need not be materialized and
863 the renamed expression is something we can stabilize, use
864 that for the renaming. At the global level, we can only do
865 this if we know no SAVE_EXPRs need be made, because the
866 expression we return might be used in arbitrary conditional
867 branches so we must force the SAVE_EXPRs evaluation
868 immediately and this requires a function context. */
869 if (!Materialize_Entity (gnat_entity)
870 && (!global_bindings_p ()
871 || (staticp (gnu_expr)
872 && !TREE_SIDE_EFFECTS (gnu_expr))))
875 = maybe_stabilize_reference (gnu_expr, true, &stable);
879 gnu_decl = maybe_stable_expr;
880 /* ??? No DECL_EXPR is created so we need to mark
881 the expression manually lest it is shared. */
882 if (global_bindings_p ())
883 mark_visited (&gnu_decl);
884 save_gnu_tree (gnat_entity, gnu_decl, true);
889 /* The stabilization failed. Keep maybe_stable_expr
890 untouched here to let the pointer case below know
891 about that failure. */
894 /* Case 3: If this is a constant renaming and creating a
895 new object is allowed and cheap, treat it as a normal
896 object whose initial value is what is being renamed. */
898 && !Is_Composite_Type
899 (Underlying_Type (Etype (gnat_entity))))
902 /* Case 4: Make this into a constant pointer to the object we
903 are to rename and attach the object to the pointer if it is
904 something we can stabilize.
906 From the proper scope, attached objects will be referenced
907 directly instead of indirectly via the pointer to avoid
908 subtle aliasing problems with non-addressable entities.
909 They have to be stable because we must not evaluate the
910 variables in the expression every time the renaming is used.
911 The pointer is called a "renaming" pointer in this case.
913 In the rare cases where we cannot stabilize the renamed
914 object, we just make a "bare" pointer, and the renamed
915 entity is always accessed indirectly through it. */
918 gnu_type = build_reference_type (gnu_type);
919 inner_const_flag = TREE_READONLY (gnu_expr);
922 /* If the previous attempt at stabilizing failed, there
923 is no point in trying again and we reuse the result
924 without attaching it to the pointer. In this case it
925 will only be used as the initializing expression of
926 the pointer and thus needs no special treatment with
927 regard to multiple evaluations. */
928 if (maybe_stable_expr)
931 /* Otherwise, try to stabilize and attach the expression
932 to the pointer if the stabilization succeeds.
934 Note that this might introduce SAVE_EXPRs and we don't
935 check whether we're at the global level or not. This
936 is fine since we are building a pointer initializer and
937 neither the pointer nor the initializing expression can
938 be accessed before the pointer elaboration has taken
939 place in a correct program.
941 These SAVE_EXPRs will be evaluated at the right place
942 by either the evaluation of the initializer for the
943 non-global case or the elaboration code for the global
944 case, and will be attached to the elaboration procedure
945 in the latter case. */
949 = maybe_stabilize_reference (gnu_expr, true, &stable);
952 renamed_obj = maybe_stable_expr;
954 /* Attaching is actually performed downstream, as soon
955 as we have a VAR_DECL for the pointer we make. */
959 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
961 gnu_size = NULL_TREE;
967 /* Make a volatile version of this object's type if we are to make
968 the object volatile. We also interpret 13.3(19) conservatively
969 and disallow any optimizations for such a non-constant object. */
970 if ((Treat_As_Volatile (gnat_entity)
972 && (Is_Exported (gnat_entity)
973 || Is_Imported (gnat_entity)
974 || Present (Address_Clause (gnat_entity)))))
975 && !TYPE_VOLATILE (gnu_type))
976 gnu_type = build_qualified_type (gnu_type,
977 (TYPE_QUALS (gnu_type)
978 | TYPE_QUAL_VOLATILE));
980 /* If we are defining an aliased object whose nominal subtype is
981 unconstrained, the object is a record that contains both the
982 template and the object. If there is an initializer, it will
983 have already been converted to the right type, but we need to
984 create the template if there is no initializer. */
987 && TREE_CODE (gnu_type) == RECORD_TYPE
988 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
989 /* Beware that padding might have been introduced
990 via maybe_pad_type above. */
991 || (TYPE_IS_PADDING_P (gnu_type)
992 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
994 && TYPE_CONTAINS_TEMPLATE_P
995 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
998 = TYPE_IS_PADDING_P (gnu_type)
999 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1000 : TYPE_FIELDS (gnu_type);
1003 = gnat_build_constructor
1007 build_template (TREE_TYPE (template_field),
1008 TREE_TYPE (TREE_CHAIN (template_field)),
1013 /* Convert the expression to the type of the object except in the
1014 case where the object's type is unconstrained or the object's type
1015 is a padded record whose field is of self-referential size. In
1016 the former case, converting will generate unnecessary evaluations
1017 of the CONSTRUCTOR to compute the size and in the latter case, we
1018 want to only copy the actual data. */
1020 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1021 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1022 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1023 && TYPE_IS_PADDING_P (gnu_type)
1024 && (CONTAINS_PLACEHOLDER_P
1025 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1026 gnu_expr = convert (gnu_type, gnu_expr);
1028 /* If this is a pointer and it does not have an initializing
1029 expression, initialize it to NULL, unless the object is
1032 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
1033 && !Is_Imported (gnat_entity) && !gnu_expr)
1034 gnu_expr = integer_zero_node;
1036 /* If we are defining the object and it has an Address clause, we must
1037 either get the address expression from the saved GCC tree for the
1038 object if it has a Freeze node, or elaborate the address expression
1039 here since the front-end has guaranteed that the elaboration has no
1040 effects in this case. */
1041 if (definition && Present (Address_Clause (gnat_entity)))
1044 = present_gnu_tree (gnat_entity)
1045 ? get_gnu_tree (gnat_entity)
1046 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1048 save_gnu_tree (gnat_entity, NULL_TREE, false);
1050 /* Ignore the size. It's either meaningless or was handled
1052 gnu_size = NULL_TREE;
1053 /* Convert the type of the object to a reference type that can
1054 alias everything as per 13.3(19). */
1056 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1057 gnu_address = convert (gnu_type, gnu_address);
1059 const_flag = !Is_Public (gnat_entity)
1060 || compile_time_known_address_p (Expression (Address_Clause
1063 /* If this is a deferred constant, the initializer is attached to
1065 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1068 (Expression (Declaration_Node (Full_View (gnat_entity))));
1070 /* If we don't have an initializing expression for the underlying
1071 variable, the initializing expression for the pointer is the
1072 specified address. Otherwise, we have to make a COMPOUND_EXPR
1073 to assign both the address and the initial value. */
1075 gnu_expr = gnu_address;
1078 = build2 (COMPOUND_EXPR, gnu_type,
1080 (MODIFY_EXPR, NULL_TREE,
1081 build_unary_op (INDIRECT_REF, NULL_TREE,
1087 /* If it has an address clause and we are not defining it, mark it
1088 as an indirect object. Likewise for Stdcall objects that are
1090 if ((!definition && Present (Address_Clause (gnat_entity)))
1091 || (Is_Imported (gnat_entity)
1092 && Has_Stdcall_Convention (gnat_entity)))
1094 /* Convert the type of the object to a reference type that can
1095 alias everything as per 13.3(19). */
1097 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1098 gnu_size = NULL_TREE;
1100 /* No point in taking the address of an initializing expression
1101 that isn't going to be used. */
1102 gnu_expr = NULL_TREE;
1104 /* If it has an address clause whose value is known at compile
1105 time, make the object a CONST_DECL. This will avoid a
1106 useless dereference. */
1107 if (Present (Address_Clause (gnat_entity)))
1109 Node_Id gnat_address
1110 = Expression (Address_Clause (gnat_entity));
1112 if (compile_time_known_address_p (gnat_address))
1114 gnu_expr = gnat_to_gnu (gnat_address);
1122 /* If we are at top level and this object is of variable size,
1123 make the actual type a hidden pointer to the real type and
1124 make the initializer be a memory allocation and initialization.
1125 Likewise for objects we aren't defining (presumed to be
1126 external references from other packages), but there we do
1127 not set up an initialization.
1129 If the object's size overflows, make an allocator too, so that
1130 Storage_Error gets raised. Note that we will never free
1131 such memory, so we presume it never will get allocated. */
1133 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1134 global_bindings_p () || !definition
1137 && ! allocatable_size_p (gnu_size,
1138 global_bindings_p () || !definition
1141 gnu_type = build_reference_type (gnu_type);
1142 gnu_size = NULL_TREE;
1146 /* In case this was a aliased object whose nominal subtype is
1147 unconstrained, the pointer above will be a thin pointer and
1148 build_allocator will automatically make the template.
1150 If we have a template initializer only (that we made above),
1151 pretend there is none and rely on what build_allocator creates
1152 again anyway. Otherwise (if we have a full initializer), get
1153 the data part and feed that to build_allocator.
1155 If we are elaborating a mutable object, tell build_allocator to
1156 ignore a possibly simpler size from the initializer, if any, as
1157 we must allocate the maximum possible size in this case. */
1161 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1163 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1164 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1167 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1169 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1170 && 1 == VEC_length (constructor_elt,
1171 CONSTRUCTOR_ELTS (gnu_expr)))
1175 = build_component_ref
1176 (gnu_expr, NULL_TREE,
1177 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1181 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1182 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1183 && !Is_Imported (gnat_entity))
1184 post_error ("?Storage_Error will be raised at run-time!",
1187 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1188 0, 0, gnat_entity, mutable_p);
1192 gnu_expr = NULL_TREE;
1197 /* If this object would go into the stack and has an alignment larger
1198 than the largest stack alignment the back-end can honor, resort to
1199 a variable of "aligning type". */
1200 if (!global_bindings_p () && !static_p && definition
1201 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1203 /* Create the new variable. No need for extra room before the
1204 aligned field as this is in automatic storage. */
1206 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1207 TYPE_SIZE_UNIT (gnu_type),
1208 BIGGEST_ALIGNMENT, 0);
1210 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1211 NULL_TREE, gnu_new_type, NULL_TREE, false,
1212 false, false, false, NULL, gnat_entity);
1214 /* Initialize the aligned field if we have an initializer. */
1217 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1219 (gnu_new_var, NULL_TREE,
1220 TYPE_FIELDS (gnu_new_type), false),
1224 /* And setup this entity as a reference to the aligned field. */
1225 gnu_type = build_reference_type (gnu_type);
1228 (ADDR_EXPR, gnu_type,
1229 build_component_ref (gnu_new_var, NULL_TREE,
1230 TYPE_FIELDS (gnu_new_type), false));
1232 gnu_size = NULL_TREE;
1238 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1239 | TYPE_QUAL_CONST));
1241 /* Convert the expression to the type of the object except in the
1242 case where the object's type is unconstrained or the object's type
1243 is a padded record whose field is of self-referential size. In
1244 the former case, converting will generate unnecessary evaluations
1245 of the CONSTRUCTOR to compute the size and in the latter case, we
1246 want to only copy the actual data. */
1248 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1249 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1250 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1251 && TYPE_IS_PADDING_P (gnu_type)
1252 && (CONTAINS_PLACEHOLDER_P
1253 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1254 gnu_expr = convert (gnu_type, gnu_expr);
1256 /* If this name is external or there was a name specified, use it,
1257 unless this is a VMS exception object since this would conflict
1258 with the symbol we need to export in addition. Don't use the
1259 Interface_Name if there is an address clause (see CD30005). */
1260 if (!Is_VMS_Exception (gnat_entity)
1261 && ((Present (Interface_Name (gnat_entity))
1262 && No (Address_Clause (gnat_entity)))
1263 || (Is_Public (gnat_entity)
1264 && (!Is_Imported (gnat_entity)
1265 || Is_Exported (gnat_entity)))))
1266 gnu_ext_name = create_concat_name (gnat_entity, 0);
1268 /* If this is constant initialized to a static constant and the
1269 object has an aggregate type, force it to be statically
1270 allocated. This will avoid an initialization copy. */
1271 if (!static_p && const_flag
1272 && gnu_expr && TREE_CONSTANT (gnu_expr)
1273 && AGGREGATE_TYPE_P (gnu_type)
1274 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1275 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1276 && TYPE_IS_PADDING_P (gnu_type)
1277 && !host_integerp (TYPE_SIZE_UNIT
1278 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1281 gnu_decl = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1282 gnu_expr, const_flag,
1283 Is_Public (gnat_entity),
1284 imported_p || !definition,
1285 static_p, attr_list, gnat_entity);
1286 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1287 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1288 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1290 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1291 if (global_bindings_p ())
1293 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1294 record_global_renaming_pointer (gnu_decl);
1298 if (definition && DECL_SIZE_UNIT (gnu_decl)
1299 && get_block_jmpbuf_decl ()
1300 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1301 || (flag_stack_check == GENERIC_STACK_CHECK
1302 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1303 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1304 add_stmt_with_node (build_call_1_expr
1305 (update_setjmp_buf_decl,
1306 build_unary_op (ADDR_EXPR, NULL_TREE,
1307 get_block_jmpbuf_decl ())),
1310 /* If we are defining an Out parameter and we're not optimizing,
1311 create a fake PARM_DECL for debugging purposes and make it
1312 point to the VAR_DECL. Suppress debug info for the latter
1313 but make sure it will still live on the stack so it can be
1314 accessed from within the debugger through the PARM_DECL. */
1315 if (kind == E_Out_Parameter && definition && !optimize)
1317 tree param = create_param_decl (gnu_entity_id, gnu_type, false);
1318 gnat_pushdecl (param, gnat_entity);
1319 SET_DECL_VALUE_EXPR (param, gnu_decl);
1320 DECL_HAS_VALUE_EXPR_P (param) = 1;
1322 debug_info_p = false;
1324 DECL_IGNORED_P (param) = 1;
1325 TREE_ADDRESSABLE (gnu_decl) = 1;
1328 /* If this is a public constant or we're not optimizing and we're not
1329 making a VAR_DECL for it, make one just for export or debugger use.
1330 Likewise if the address is taken or if either the object or type is
1331 aliased. Make an external declaration for a reference, unless this
1332 is a Standard entity since there no real symbol at the object level
1334 if (TREE_CODE (gnu_decl) == CONST_DECL
1335 && (definition || Sloc (gnat_entity) > Standard_Location)
1336 && ((Is_Public (gnat_entity)
1337 && !Present (Address_Clause (gnat_entity)))
1339 || Address_Taken (gnat_entity)
1340 || Is_Aliased (gnat_entity)
1341 || Is_Aliased (Etype (gnat_entity))))
1344 = create_true_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1345 gnu_expr, true, Is_Public (gnat_entity),
1346 !definition, static_p, NULL,
1349 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1351 /* As debugging information will be generated for the variable,
1352 do not generate information for the constant. */
1353 DECL_IGNORED_P (gnu_decl) = 1;
1356 /* If this is declared in a block that contains a block with an
1357 exception handler, we must force this variable in memory to
1358 suppress an invalid optimization. */
1359 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1360 && Exception_Mechanism != Back_End_Exceptions)
1361 TREE_ADDRESSABLE (gnu_decl) = 1;
1363 gnu_type = TREE_TYPE (gnu_decl);
1365 /* Back-annotate Alignment and Esize of the object if not already
1366 known, except for when the object is actually a pointer to the
1367 real object, since alignment and size of a pointer don't have
1368 anything to do with those of the designated object. Note that
1369 we pick the values of the type, not those of the object, to
1370 shield ourselves from low-level platform-dependent adjustments
1371 like alignment promotion. This is both consistent with all the
1372 treatment above, where alignment and size are set on the type of
1373 the object and not on the object directly, and makes it possible
1374 to support confirming representation clauses in all cases. */
1376 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1377 Set_Alignment (gnat_entity,
1378 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
1380 if (!used_by_ref && Unknown_Esize (gnat_entity))
1382 if (TREE_CODE (gnu_type) == RECORD_TYPE
1383 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
1385 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
1387 Set_Esize (gnat_entity, annotate_value (gnu_object_size));
1393 /* Return a TYPE_DECL for "void" that we previously made. */
1394 gnu_decl = TYPE_NAME (void_type_node);
1397 case E_Enumeration_Type:
1398 /* A special case, for the types Character and Wide_Character in
1399 Standard, we do not list all the literals. So if the literals
1400 are not specified, make this an unsigned type. */
1401 if (No (First_Literal (gnat_entity)))
1403 gnu_type = make_unsigned_type (esize);
1404 TYPE_NAME (gnu_type) = gnu_entity_id;
1406 /* Set TYPE_STRING_FLAG for Ada Character and Wide_Character types.
1407 This is needed by the DWARF-2 back-end to distinguish between
1408 unsigned integer types and character types. */
1409 TYPE_STRING_FLAG (gnu_type) = 1;
1413 /* Normal case of non-character type, or non-Standard character type */
1415 /* Here we have a list of enumeral constants in First_Literal.
1416 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1417 the list to be places into TYPE_FIELDS. Each node in the list
1418 is a TREE_LIST node whose TREE_VALUE is the literal name
1419 and whose TREE_PURPOSE is the value of the literal.
1421 Esize contains the number of bits needed to represent the enumeral
1422 type, Type_Low_Bound also points to the first literal and
1423 Type_High_Bound points to the last literal. */
1425 Entity_Id gnat_literal;
1426 tree gnu_literal_list = NULL_TREE;
1428 if (Is_Unsigned_Type (gnat_entity))
1429 gnu_type = make_unsigned_type (esize);
1431 gnu_type = make_signed_type (esize);
1433 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1435 for (gnat_literal = First_Literal (gnat_entity);
1436 Present (gnat_literal);
1437 gnat_literal = Next_Literal (gnat_literal))
1439 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1442 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1443 gnu_type, gnu_value, true, false, false,
1444 false, NULL, gnat_literal);
1446 save_gnu_tree (gnat_literal, gnu_literal, false);
1447 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1448 gnu_value, gnu_literal_list);
1451 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1453 /* Note that the bounds are updated at the end of this function
1454 because to avoid an infinite recursion when we get the bounds of
1455 this type, since those bounds are objects of this type. */
1459 case E_Signed_Integer_Type:
1460 case E_Ordinary_Fixed_Point_Type:
1461 case E_Decimal_Fixed_Point_Type:
1462 /* For integer types, just make a signed type the appropriate number
1464 gnu_type = make_signed_type (esize);
1467 case E_Modular_Integer_Type:
1469 /* For modular types, make the unsigned type of the proper number
1470 of bits and then set up the modulus, if required. */
1471 tree gnu_modulus, gnu_high = NULL_TREE;
1472 enum machine_mode mode;
1474 /* Packed array types are supposed to be subtypes only. */
1475 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1477 /* Find the smallest mode at least ESIZE bits wide and make a class
1479 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1480 GET_MODE_BITSIZE (mode) < esize;
1481 mode = GET_MODE_WIDER_MODE (mode))
1484 gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode));
1486 /* Get the modulus in this type. If it overflows, assume it is because
1487 it is equal to 2**Esize. Note that there is no overflow checking
1488 done on unsigned type, so we detect the overflow by looking for
1489 a modulus of zero, which is otherwise invalid. */
1490 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1492 if (!integer_zerop (gnu_modulus))
1494 TYPE_MODULAR_P (gnu_type) = 1;
1495 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1496 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1497 convert (gnu_type, integer_one_node));
1500 /* If we have to set TYPE_PRECISION different from its natural value,
1501 make a subtype to do do. Likewise if there is a modulus and
1502 it is not one greater than TYPE_MAX_VALUE. */
1503 if (TYPE_PRECISION (gnu_type) != esize
1504 || (TYPE_MODULAR_P (gnu_type)
1505 && !tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high)))
1507 tree gnu_subtype = make_node (INTEGER_TYPE);
1508 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1509 TREE_TYPE (gnu_subtype) = gnu_type;
1510 TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type);
1511 TYPE_MAX_VALUE (gnu_subtype)
1512 = TYPE_MODULAR_P (gnu_type)
1513 ? gnu_high : TYPE_MAX_VALUE (gnu_type);
1514 TYPE_PRECISION (gnu_subtype) = esize;
1515 TYPE_UNSIGNED (gnu_subtype) = 1;
1516 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1517 layout_type (gnu_subtype);
1518 gnu_type = gnu_subtype;
1523 case E_Signed_Integer_Subtype:
1524 case E_Enumeration_Subtype:
1525 case E_Modular_Integer_Subtype:
1526 case E_Ordinary_Fixed_Point_Subtype:
1527 case E_Decimal_Fixed_Point_Subtype:
1529 /* For integral subtypes, we make a new INTEGER_TYPE. Note
1530 that we do not want to call build_range_type since we would
1531 like each subtype node to be distinct. This will be important
1532 when memory aliasing is implemented.
1534 The TREE_TYPE field of the INTEGER_TYPE we make points to the
1535 parent type; this fact is used by the arithmetic conversion
1538 We elaborate the Ancestor_Subtype if it is not in the current
1539 unit and one of our bounds is non-static. We do this to ensure
1540 consistent naming in the case where several subtypes share the same
1541 bounds by always elaborating the first such subtype first, thus
1545 && Present (Ancestor_Subtype (gnat_entity))
1546 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1547 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1548 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1549 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1551 gnu_type = make_node (INTEGER_TYPE);
1552 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1554 /* Set the precision to the Esize except for bit-packed arrays and
1555 subtypes of Standard.Boolean. */
1556 if (Is_Packed_Array_Type (gnat_entity)
1557 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1558 esize = UI_To_Int (RM_Size (gnat_entity));
1559 else if (TREE_CODE (TREE_TYPE (gnu_type)) == BOOLEAN_TYPE)
1562 TYPE_PRECISION (gnu_type) = esize;
1564 TYPE_MIN_VALUE (gnu_type)
1565 = convert (TREE_TYPE (gnu_type),
1566 elaborate_expression (Type_Low_Bound (gnat_entity),
1568 get_identifier ("L"), definition, 1,
1569 Needs_Debug_Info (gnat_entity)));
1571 TYPE_MAX_VALUE (gnu_type)
1572 = convert (TREE_TYPE (gnu_type),
1573 elaborate_expression (Type_High_Bound (gnat_entity),
1575 get_identifier ("U"), definition, 1,
1576 Needs_Debug_Info (gnat_entity)));
1578 /* One of the above calls might have caused us to be elaborated,
1579 so don't blow up if so. */
1580 if (present_gnu_tree (gnat_entity))
1582 maybe_present = true;
1586 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1587 = Has_Biased_Representation (gnat_entity);
1589 /* This should be an unsigned type if the lower bound is constant
1590 and non-negative or if the base type is unsigned; a signed type
1592 TYPE_UNSIGNED (gnu_type)
1593 = (TYPE_UNSIGNED (TREE_TYPE (gnu_type))
1594 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
1595 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
1596 || TYPE_BIASED_REPRESENTATION_P (gnu_type)
1597 || Is_Unsigned_Type (gnat_entity));
1599 layout_type (gnu_type);
1601 /* Inherit our alias set from what we're a subtype of. Subtypes
1602 are not different types and a pointer can designate any instance
1603 within a subtype hierarchy. */
1604 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1606 /* If the type we are dealing with represents a bit-packed array,
1607 we need to have the bits left justified on big-endian targets
1608 and right justified on little-endian targets. We also need to
1609 ensure that when the value is read (e.g. for comparison of two
1610 such values), we only get the good bits, since the unused bits
1611 are uninitialized. Both goals are accomplished by wrapping up
1612 the modular type in an enclosing record type. */
1613 if (Is_Packed_Array_Type (gnat_entity)
1614 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1616 tree gnu_field_type, gnu_field;
1618 /* Set the RM size before wrapping up the type. */
1619 TYPE_RM_SIZE (gnu_type)
1620 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1621 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1622 gnu_field_type = gnu_type;
1624 gnu_type = make_node (RECORD_TYPE);
1625 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1627 /* Propagate the alignment of the modular type to the record.
1628 This means that bit-packed arrays have "ceil" alignment for
1629 their size, which may seem counter-intuitive but makes it
1630 possible to easily overlay them on modular types. */
1631 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1632 TYPE_PACKED (gnu_type) = 1;
1634 /* Create a stripped-down declaration of the original type, mainly
1636 create_type_decl (gnu_entity_id, gnu_field_type, NULL, true,
1637 debug_info_p, gnat_entity);
1639 /* Don't notify the field as "addressable", since we won't be taking
1640 it's address and it would prevent create_field_decl from making a
1642 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1643 gnu_field_type, gnu_type, 1, 0, 0, 0);
1645 finish_record_type (gnu_type, gnu_field, 0, false);
1646 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1648 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1651 /* If the type we are dealing with has got a smaller alignment than the
1652 natural one, we need to wrap it up in a record type and under-align
1653 the latter. We reuse the padding machinery for this purpose. */
1654 else if (Known_Alignment (gnat_entity)
1655 && UI_Is_In_Int_Range (Alignment (gnat_entity))
1656 && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
1657 && align < TYPE_ALIGN (gnu_type))
1659 tree gnu_field_type, gnu_field;
1661 /* Set the RM size before wrapping up the type. */
1662 TYPE_RM_SIZE (gnu_type)
1663 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1664 gnu_field_type = gnu_type;
1666 gnu_type = make_node (RECORD_TYPE);
1667 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1669 TYPE_ALIGN (gnu_type) = align;
1670 TYPE_PACKED (gnu_type) = 1;
1672 /* Create a stripped-down declaration of the original type, mainly
1674 create_type_decl (gnu_entity_id, gnu_field_type, NULL, true,
1675 debug_info_p, gnat_entity);
1677 /* Don't notify the field as "addressable", since we won't be taking
1678 it's address and it would prevent create_field_decl from making a
1680 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1681 gnu_field_type, gnu_type, 1, 0, 0, 0);
1683 finish_record_type (gnu_type, gnu_field, 0, false);
1684 TYPE_IS_PADDING_P (gnu_type) = 1;
1686 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1689 /* Otherwise reset the alignment lest we computed it above. */
1695 case E_Floating_Point_Type:
1696 /* If this is a VAX floating-point type, use an integer of the proper
1697 size. All the operations will be handled with ASM statements. */
1698 if (Vax_Float (gnat_entity))
1700 gnu_type = make_signed_type (esize);
1701 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1702 SET_TYPE_DIGITS_VALUE (gnu_type,
1703 UI_To_gnu (Digits_Value (gnat_entity),
1708 /* The type of the Low and High bounds can be our type if this is
1709 a type from Standard, so set them at the end of the function. */
1710 gnu_type = make_node (REAL_TYPE);
1711 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1712 layout_type (gnu_type);
1715 case E_Floating_Point_Subtype:
1716 if (Vax_Float (gnat_entity))
1718 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1724 && Present (Ancestor_Subtype (gnat_entity))
1725 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1726 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1727 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1728 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1731 gnu_type = make_node (REAL_TYPE);
1732 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1733 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1735 TYPE_MIN_VALUE (gnu_type)
1736 = convert (TREE_TYPE (gnu_type),
1737 elaborate_expression (Type_Low_Bound (gnat_entity),
1738 gnat_entity, get_identifier ("L"),
1740 Needs_Debug_Info (gnat_entity)));
1742 TYPE_MAX_VALUE (gnu_type)
1743 = convert (TREE_TYPE (gnu_type),
1744 elaborate_expression (Type_High_Bound (gnat_entity),
1745 gnat_entity, get_identifier ("U"),
1747 Needs_Debug_Info (gnat_entity)));
1749 /* One of the above calls might have caused us to be elaborated,
1750 so don't blow up if so. */
1751 if (present_gnu_tree (gnat_entity))
1753 maybe_present = true;
1757 layout_type (gnu_type);
1759 /* Inherit our alias set from what we're a subtype of, as for
1760 integer subtypes. */
1761 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1765 /* Array and String Types and Subtypes
1767 Unconstrained array types are represented by E_Array_Type and
1768 constrained array types are represented by E_Array_Subtype. There
1769 are no actual objects of an unconstrained array type; all we have
1770 are pointers to that type.
1772 The following fields are defined on array types and subtypes:
1774 Component_Type Component type of the array.
1775 Number_Dimensions Number of dimensions (an int).
1776 First_Index Type of first index. */
1781 tree gnu_template_fields = NULL_TREE;
1782 tree gnu_template_type = make_node (RECORD_TYPE);
1783 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1784 tree gnu_fat_type = make_node (RECORD_TYPE);
1785 int ndim = Number_Dimensions (gnat_entity);
1787 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1789 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1791 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
1792 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
1793 tree gnu_comp_size = 0;
1794 tree gnu_max_size = size_one_node;
1795 tree gnu_max_size_unit;
1796 Entity_Id gnat_ind_subtype;
1797 Entity_Id gnat_ind_base_subtype;
1798 tree gnu_template_reference;
1801 TYPE_NAME (gnu_template_type)
1802 = create_concat_name (gnat_entity, "XUB");
1804 /* Make a node for the array. If we are not defining the array
1805 suppress expanding incomplete types. */
1806 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1809 defer_incomplete_level++, this_deferred = true;
1811 /* Build the fat pointer type. Use a "void *" object instead of
1812 a pointer to the array type since we don't have the array type
1813 yet (it will reference the fat pointer via the bounds). */
1814 tem = chainon (chainon (NULL_TREE,
1815 create_field_decl (get_identifier ("P_ARRAY"),
1817 gnu_fat_type, 0, 0, 0, 0)),
1818 create_field_decl (get_identifier ("P_BOUNDS"),
1820 gnu_fat_type, 0, 0, 0, 0));
1822 /* Make sure we can put this into a register. */
1823 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1825 /* Do not finalize this record type since the types of its fields
1826 are still incomplete at this point. */
1827 finish_record_type (gnu_fat_type, tem, 0, true);
1828 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1830 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1831 is the fat pointer. This will be used to access the individual
1832 fields once we build them. */
1833 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1834 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1835 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1836 gnu_template_reference
1837 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1838 TREE_READONLY (gnu_template_reference) = 1;
1840 /* Now create the GCC type for each index and add the fields for
1841 that index to the template. */
1842 for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
1843 gnat_ind_base_subtype
1844 = First_Index (Implementation_Base_Type (gnat_entity));
1845 index < ndim && index >= 0;
1847 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1848 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1850 char field_name[10];
1851 tree gnu_ind_subtype
1852 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1853 tree gnu_base_subtype
1854 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1856 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1858 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1859 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1861 /* Make the FIELD_DECLs for the minimum and maximum of this
1862 type and then make extractions of that field from the
1864 sprintf (field_name, "LB%d", index);
1865 gnu_min_field = create_field_decl (get_identifier (field_name),
1867 gnu_template_type, 0, 0, 0, 0);
1868 field_name[0] = 'U';
1869 gnu_max_field = create_field_decl (get_identifier (field_name),
1871 gnu_template_type, 0, 0, 0, 0);
1873 Sloc_to_locus (Sloc (gnat_entity),
1874 &DECL_SOURCE_LOCATION (gnu_min_field));
1875 Sloc_to_locus (Sloc (gnat_entity),
1876 &DECL_SOURCE_LOCATION (gnu_max_field));
1877 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1879 /* We can't use build_component_ref here since the template
1880 type isn't complete yet. */
1881 gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype,
1882 gnu_template_reference, gnu_min_field,
1884 gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype,
1885 gnu_template_reference, gnu_max_field,
1887 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1889 /* Make a range type with the new ranges, but using
1890 the Ada subtype. Then we convert to sizetype. */
1891 gnu_index_types[index]
1892 = create_index_type (convert (sizetype, gnu_min),
1893 convert (sizetype, gnu_max),
1894 build_range_type (gnu_ind_subtype,
1897 /* Update the maximum size of the array, in elements. */
1899 = size_binop (MULT_EXPR, gnu_max_size,
1900 size_binop (PLUS_EXPR, size_one_node,
1901 size_binop (MINUS_EXPR, gnu_base_max,
1904 TYPE_NAME (gnu_index_types[index])
1905 = create_concat_name (gnat_entity, field_name);
1908 for (index = 0; index < ndim; index++)
1910 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1912 /* Install all the fields into the template. */
1913 finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
1914 TYPE_READONLY (gnu_template_type) = 1;
1916 /* Now make the array of arrays and update the pointer to the array
1917 in the fat pointer. Note that it is the first field. */
1918 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1920 /* Try to get a smaller form of the component if needed. */
1921 if ((Is_Packed (gnat_entity)
1922 || Has_Component_Size_Clause (gnat_entity))
1923 && !Is_Bit_Packed_Array (gnat_entity)
1924 && !Has_Aliased_Components (gnat_entity)
1925 && !Strict_Alignment (Component_Type (gnat_entity))
1926 && TREE_CODE (tem) == RECORD_TYPE
1927 && !TYPE_IS_FAT_POINTER_P (tem)
1928 && host_integerp (TYPE_SIZE (tem), 1))
1929 tem = make_packable_type (tem, false);
1931 if (Has_Atomic_Components (gnat_entity))
1932 check_ok_for_atomic (tem, gnat_entity, true);
1934 /* Get and validate any specified Component_Size, but if Packed,
1935 ignore it since the front end will have taken care of it. */
1937 = validate_size (Component_Size (gnat_entity), tem,
1939 (Is_Bit_Packed_Array (gnat_entity)
1940 ? TYPE_DECL : VAR_DECL),
1941 true, Has_Component_Size_Clause (gnat_entity));
1943 /* If the component type is a RECORD_TYPE that has a self-referential
1944 size, use the maximum size. */
1945 if (!gnu_comp_size && TREE_CODE (tem) == RECORD_TYPE
1946 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1947 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1949 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
1952 tem = make_type_from_size (tem, gnu_comp_size, false);
1954 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1955 "C_PAD", false, definition, true);
1956 /* If a padding record was made, declare it now since it will
1957 never be declared otherwise. This is necessary to ensure
1958 that its subtrees are properly marked. */
1959 if (tem != orig_tem)
1960 create_type_decl (TYPE_NAME (tem), tem, NULL, true,
1961 debug_info_p, gnat_entity);
1964 if (Has_Volatile_Components (gnat_entity))
1965 tem = build_qualified_type (tem,
1966 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1968 /* If Component_Size is not already specified, annotate it with the
1969 size of the component. */
1970 if (Unknown_Component_Size (gnat_entity))
1971 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1973 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
1974 size_binop (MULT_EXPR, gnu_max_size,
1975 TYPE_SIZE_UNIT (tem)));
1976 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
1977 size_binop (MULT_EXPR,
1978 convert (bitsizetype,
1982 for (index = ndim - 1; index >= 0; index--)
1984 tem = build_array_type (tem, gnu_index_types[index]);
1985 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1986 if (array_type_has_nonaliased_component (gnat_entity, tem))
1987 TYPE_NONALIASED_COMPONENT (tem) = 1;
1990 /* If an alignment is specified, use it if valid. But ignore it for
1991 types that represent the unpacked base type for packed arrays. If
1992 the alignment was requested with an explicit user alignment clause,
1994 if (No (Packed_Array_Type (gnat_entity))
1995 && Known_Alignment (gnat_entity))
1997 gcc_assert (Present (Alignment (gnat_entity)));
1999 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2001 if (Present (Alignment_Clause (gnat_entity)))
2002 TYPE_USER_ALIGN (tem) = 1;
2005 TYPE_CONVENTION_FORTRAN_P (tem)
2006 = (Convention (gnat_entity) == Convention_Fortran);
2007 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2009 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2010 corresponding fat pointer. */
2011 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2012 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2013 SET_TYPE_MODE (gnu_type, BLKmode);
2014 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2015 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2017 /* If the maximum size doesn't overflow, use it. */
2018 if (TREE_CODE (gnu_max_size) == INTEGER_CST
2019 && !TREE_OVERFLOW (gnu_max_size))
2021 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
2022 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2023 && !TREE_OVERFLOW (gnu_max_size_unit))
2024 TYPE_SIZE_UNIT (tem)
2025 = size_binop (MIN_EXPR, gnu_max_size_unit,
2026 TYPE_SIZE_UNIT (tem));
2028 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2029 tem, NULL, !Comes_From_Source (gnat_entity),
2030 debug_info_p, gnat_entity);
2032 /* Give the fat pointer type a name. */
2033 create_type_decl (create_concat_name (gnat_entity, "XUP"),
2034 gnu_fat_type, NULL, true,
2035 debug_info_p, gnat_entity);
2037 /* Create the type to be used as what a thin pointer designates: an
2038 record type for the object and its template with the field offsets
2039 shifted to have the template at a negative offset. */
2040 tem = build_unc_object_type (gnu_template_type, tem,
2041 create_concat_name (gnat_entity, "XUT"));
2042 shift_unc_components_for_thin_pointers (tem);
2044 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2045 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2047 /* Give the thin pointer type a name. */
2048 create_type_decl (create_concat_name (gnat_entity, "XUX"),
2049 build_pointer_type (tem), NULL, true,
2050 debug_info_p, gnat_entity);
2054 case E_String_Subtype:
2055 case E_Array_Subtype:
2057 /* This is the actual data type for array variables. Multidimensional
2058 arrays are implemented in the gnu tree as arrays of arrays. Note
2059 that for the moment arrays which have sparse enumeration subtypes as
2060 index components create sparse arrays, which is obviously space
2061 inefficient but so much easier to code for now.
2063 Also note that the subtype never refers to the unconstrained
2064 array type, which is somewhat at variance with Ada semantics.
2066 First check to see if this is simply a renaming of the array
2067 type. If so, the result is the array type. */
2069 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2070 if (!Is_Constrained (gnat_entity))
2075 int array_dim = Number_Dimensions (gnat_entity);
2077 = ((Convention (gnat_entity) == Convention_Fortran)
2078 ? array_dim - 1 : 0);
2080 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
2081 Entity_Id gnat_ind_subtype;
2082 Entity_Id gnat_ind_base_subtype;
2083 tree gnu_base_type = gnu_type;
2084 tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
2085 tree gnu_comp_size = NULL_TREE;
2086 tree gnu_max_size = size_one_node;
2087 tree gnu_max_size_unit;
2088 bool need_index_type_struct = false;
2089 bool max_overflow = false;
2091 /* First create the gnu types for each index. Create types for
2092 debugging information to point to the index types if the
2093 are not integer types, have variable bounds, or are
2094 wider than sizetype. */
2096 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
2097 gnat_ind_base_subtype
2098 = First_Index (Implementation_Base_Type (gnat_entity));
2099 index < array_dim && index >= 0;
2101 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
2102 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
2104 tree gnu_index_subtype
2105 = get_unpadded_type (Etype (gnat_ind_subtype));
2107 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
2109 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
2110 tree gnu_base_subtype
2111 = get_unpadded_type (Etype (gnat_ind_base_subtype));
2113 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
2115 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
2116 tree gnu_base_type = get_base_type (gnu_base_subtype);
2117 tree gnu_base_base_min
2118 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
2119 tree gnu_base_base_max
2120 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
2124 /* If the minimum and maximum values both overflow in
2125 SIZETYPE, but the difference in the original type
2126 does not overflow in SIZETYPE, ignore the overflow
2128 if ((TYPE_PRECISION (gnu_index_subtype)
2129 > TYPE_PRECISION (sizetype)
2130 || TYPE_UNSIGNED (gnu_index_subtype)
2131 != TYPE_UNSIGNED (sizetype))
2132 && TREE_CODE (gnu_min) == INTEGER_CST
2133 && TREE_CODE (gnu_max) == INTEGER_CST
2134 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2136 (fold_build2 (MINUS_EXPR, gnu_index_subtype,
2137 TYPE_MAX_VALUE (gnu_index_subtype),
2138 TYPE_MIN_VALUE (gnu_index_subtype)))))
2140 TREE_OVERFLOW (gnu_min) = 0;
2141 TREE_OVERFLOW (gnu_max) = 0;
2144 /* Similarly, if the range is null, use bounds of 1..0 for
2145 the sizetype bounds. */
2146 else if ((TYPE_PRECISION (gnu_index_subtype)
2147 > TYPE_PRECISION (sizetype)
2148 || TYPE_UNSIGNED (gnu_index_subtype)
2149 != TYPE_UNSIGNED (sizetype))
2150 && TREE_CODE (gnu_min) == INTEGER_CST
2151 && TREE_CODE (gnu_max) == INTEGER_CST
2152 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2153 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
2154 TYPE_MIN_VALUE (gnu_index_subtype)))
2155 gnu_min = size_one_node, gnu_max = size_zero_node;
2157 /* Now compute the size of this bound. We need to provide
2158 GCC with an upper bound to use but have to deal with the
2159 "superflat" case. There are three ways to do this. If we
2160 can prove that the array can never be superflat, we can
2161 just use the high bound of the index subtype. If we can
2162 prove that the low bound minus one can't overflow, we
2163 can do this as MAX (hb, lb - 1). Otherwise, we have to use
2164 the expression hb >= lb ? hb : lb - 1. */
2165 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2167 /* See if the base array type is already flat. If it is, we
2168 are probably compiling an ACVC test, but it will cause the
2169 code below to malfunction if we don't handle it specially. */
2170 if (TREE_CODE (gnu_base_min) == INTEGER_CST
2171 && TREE_CODE (gnu_base_max) == INTEGER_CST
2172 && !TREE_OVERFLOW (gnu_base_min)
2173 && !TREE_OVERFLOW (gnu_base_max)
2174 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
2175 gnu_high = size_zero_node, gnu_min = size_one_node;
2177 /* If gnu_high is now an integer which overflowed, the array
2178 cannot be superflat. */
2179 else if (TREE_CODE (gnu_high) == INTEGER_CST
2180 && TREE_OVERFLOW (gnu_high))
2182 else if (TYPE_UNSIGNED (gnu_base_subtype)
2183 || TREE_CODE (gnu_high) == INTEGER_CST)
2184 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2188 (sizetype, build_binary_op (GE_EXPR, integer_type_node,
2192 gnu_index_type[index]
2193 = create_index_type (gnu_min, gnu_high, gnu_index_subtype,
2196 /* Also compute the maximum size of the array. Here we
2197 see if any constraint on the index type of the base type
2198 can be used in the case of self-referential bound on
2199 the index type of the subtype. We look for a non-"infinite"
2200 and non-self-referential bound from any type involved and
2201 handle each bound separately. */
2203 if ((TREE_CODE (gnu_min) == INTEGER_CST
2204 && !TREE_OVERFLOW (gnu_min)
2205 && !operand_equal_p (gnu_min, gnu_base_base_min, 0))
2206 || !CONTAINS_PLACEHOLDER_P (gnu_min)
2207 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2208 && !TREE_OVERFLOW (gnu_base_min)))
2209 gnu_base_min = gnu_min;
2211 if ((TREE_CODE (gnu_max) == INTEGER_CST
2212 && !TREE_OVERFLOW (gnu_max)
2213 && !operand_equal_p (gnu_max, gnu_base_base_max, 0))
2214 || !CONTAINS_PLACEHOLDER_P (gnu_max)
2215 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2216 && !TREE_OVERFLOW (gnu_base_max)))
2217 gnu_base_max = gnu_max;
2219 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2220 && TREE_OVERFLOW (gnu_base_min))
2221 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2222 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2223 && TREE_OVERFLOW (gnu_base_max))
2224 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2225 max_overflow = true;
2227 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
2228 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
2231 = size_binop (MAX_EXPR,
2232 size_binop (PLUS_EXPR, size_one_node,
2233 size_binop (MINUS_EXPR, gnu_base_max,
2237 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2238 && TREE_OVERFLOW (gnu_this_max))
2239 max_overflow = true;
2242 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2244 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
2245 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
2247 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
2248 || (TREE_TYPE (gnu_index_subtype)
2249 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
2251 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
2252 || (TYPE_PRECISION (gnu_index_subtype)
2253 > TYPE_PRECISION (sizetype)))
2254 need_index_type_struct = true;
2257 /* Then flatten: create the array of arrays. For an array type
2258 used to implement a packed array, get the component type from
2259 the original array type since the representation clauses that
2260 can affect it are on the latter. */
2261 if (Is_Packed_Array_Type (gnat_entity)
2262 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2264 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2265 for (index = array_dim - 1; index >= 0; index--)
2266 gnu_type = TREE_TYPE (gnu_type);
2268 /* One of the above calls might have caused us to be elaborated,
2269 so don't blow up if so. */
2270 if (present_gnu_tree (gnat_entity))
2272 maybe_present = true;
2278 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
2280 /* One of the above calls might have caused us to be elaborated,
2281 so don't blow up if so. */
2282 if (present_gnu_tree (gnat_entity))
2284 maybe_present = true;
2288 /* Try to get a smaller form of the component if needed. */
2289 if ((Is_Packed (gnat_entity)
2290 || Has_Component_Size_Clause (gnat_entity))
2291 && !Is_Bit_Packed_Array (gnat_entity)
2292 && !Has_Aliased_Components (gnat_entity)
2293 && !Strict_Alignment (Component_Type (gnat_entity))
2294 && TREE_CODE (gnu_type) == RECORD_TYPE
2295 && !TYPE_IS_FAT_POINTER_P (gnu_type)
2296 && host_integerp (TYPE_SIZE (gnu_type), 1))
2297 gnu_type = make_packable_type (gnu_type, false);
2299 /* Get and validate any specified Component_Size, but if Packed,
2300 ignore it since the front end will have taken care of it. */
2302 = validate_size (Component_Size (gnat_entity), gnu_type,
2304 (Is_Bit_Packed_Array (gnat_entity)
2305 ? TYPE_DECL : VAR_DECL), true,
2306 Has_Component_Size_Clause (gnat_entity));
2308 /* If the component type is a RECORD_TYPE that has a
2309 self-referential size, use the maximum size. */
2311 && TREE_CODE (gnu_type) == RECORD_TYPE
2312 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2313 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
2315 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
2319 = make_type_from_size (gnu_type, gnu_comp_size, false);
2320 orig_gnu_type = gnu_type;
2321 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
2322 gnat_entity, "C_PAD", false,
2324 /* If a padding record was made, declare it now since it
2325 will never be declared otherwise. This is necessary
2326 to ensure that its subtrees are properly marked. */
2327 if (gnu_type != orig_gnu_type)
2328 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL,
2329 true, debug_info_p, gnat_entity);
2332 if (Has_Volatile_Components (Base_Type (gnat_entity)))
2333 gnu_type = build_qualified_type (gnu_type,
2334 (TYPE_QUALS (gnu_type)
2335 | TYPE_QUAL_VOLATILE));
2338 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2339 TYPE_SIZE_UNIT (gnu_type));
2340 gnu_max_size = size_binop (MULT_EXPR,
2341 convert (bitsizetype, gnu_max_size),
2342 TYPE_SIZE (gnu_type));
2344 for (index = array_dim - 1; index >= 0; index --)
2346 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
2347 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2348 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2349 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2352 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2353 if (need_index_type_struct)
2354 TYPE_STUB_DECL (gnu_type)
2355 = create_type_stub_decl (gnu_entity_id, gnu_type);
2357 /* If we are at file level and this is a multi-dimensional array, we
2358 need to make a variable corresponding to the stride of the
2359 inner dimensions. */
2360 if (global_bindings_p () && array_dim > 1)
2362 tree gnu_str_name = get_identifier ("ST");
2365 for (gnu_arr_type = TREE_TYPE (gnu_type);
2366 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2367 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2368 gnu_str_name = concat_id_with_name (gnu_str_name, "ST"))
2370 tree eltype = TREE_TYPE (gnu_arr_type);
2372 TYPE_SIZE (gnu_arr_type)
2373 = elaborate_expression_1 (gnat_entity, gnat_entity,
2374 TYPE_SIZE (gnu_arr_type),
2375 gnu_str_name, definition, 0);
2377 /* ??? For now, store the size as a multiple of the
2378 alignment of the element type in bytes so that we
2379 can see the alignment from the tree. */
2380 TYPE_SIZE_UNIT (gnu_arr_type)
2382 (MULT_EXPR, sizetype,
2383 elaborate_expression_1
2384 (gnat_entity, gnat_entity,
2385 build_binary_op (EXACT_DIV_EXPR, sizetype,
2386 TYPE_SIZE_UNIT (gnu_arr_type),
2387 size_int (TYPE_ALIGN (eltype)
2389 concat_id_with_name (gnu_str_name, "A_U"),
2391 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2393 /* ??? create_type_decl is not invoked on the inner types so
2394 the MULT_EXPR node built above will never be marked. */
2395 mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type));
2399 /* If we need to write out a record type giving the names of
2400 the bounds, do it now. Make sure to reference the index
2401 types themselves, not just their names, as the debugger
2402 may fall back on them in some cases. */
2403 if (need_index_type_struct && debug_info_p)
2405 tree gnu_bound_rec = make_node (RECORD_TYPE);
2406 tree gnu_field_list = NULL_TREE;
2409 TYPE_NAME (gnu_bound_rec)
2410 = create_concat_name (gnat_entity, "XA");
2412 for (index = array_dim - 1; index >= 0; index--)
2414 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_type[index]);
2415 tree gnu_index_name = TYPE_NAME (gnu_index);
2417 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2418 gnu_index_name = DECL_NAME (gnu_index_name);
2420 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2422 0, NULL_TREE, NULL_TREE, 0);
2423 TREE_CHAIN (gnu_field) = gnu_field_list;
2424 gnu_field_list = gnu_field;
2427 finish_record_type (gnu_bound_rec, gnu_field_list, 0, false);
2428 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2431 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2432 = (Convention (gnat_entity) == Convention_Fortran);
2433 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2434 = (Is_Packed_Array_Type (gnat_entity)
2435 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2437 /* If our size depends on a placeholder and the maximum size doesn't
2438 overflow, use it. */
2439 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2440 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2441 && TREE_OVERFLOW (gnu_max_size))
2442 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2443 && TREE_OVERFLOW (gnu_max_size_unit))
2446 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2447 TYPE_SIZE (gnu_type));
2448 TYPE_SIZE_UNIT (gnu_type)
2449 = size_binop (MIN_EXPR, gnu_max_size_unit,
2450 TYPE_SIZE_UNIT (gnu_type));
2453 /* Set our alias set to that of our base type. This gives all
2454 array subtypes the same alias set. */
2455 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2458 /* If this is a packed type, make this type the same as the packed
2459 array type, but do some adjusting in the type first. */
2460 if (Present (Packed_Array_Type (gnat_entity)))
2462 Entity_Id gnat_index;
2463 tree gnu_inner_type;
2465 /* First finish the type we had been making so that we output
2466 debugging information for it. */
2468 = build_qualified_type (gnu_type,
2469 (TYPE_QUALS (gnu_type)
2470 | (TYPE_QUAL_VOLATILE
2471 * Treat_As_Volatile (gnat_entity))));
2473 /* Make it artificial only if the base type was artificial as well.
2474 That's sort of "morally" true and will make it possible for the
2475 debugger to look it up by name in DWARF more easily. */
2477 = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2478 !Comes_From_Source (gnat_entity)
2479 && !Comes_From_Source (Etype (gnat_entity)),
2480 debug_info_p, gnat_entity);
2482 /* Save it as our equivalent in case the call below elaborates
2484 save_gnu_tree (gnat_entity, gnu_decl, false);
2486 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2488 this_made_decl = true;
2489 gnu_type = TREE_TYPE (gnu_decl);
2490 save_gnu_tree (gnat_entity, NULL_TREE, false);
2492 gnu_inner_type = gnu_type;
2493 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2494 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2495 || TYPE_IS_PADDING_P (gnu_inner_type)))
2496 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2498 /* We need to point the type we just made to our index type so
2499 the actual bounds can be put into a template. */
2501 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2502 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2503 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2504 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2506 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2508 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2509 If it is, we need to make another type. */
2510 if (TYPE_MODULAR_P (gnu_inner_type))
2514 gnu_subtype = make_node (INTEGER_TYPE);
2516 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2517 TYPE_MIN_VALUE (gnu_subtype)
2518 = TYPE_MIN_VALUE (gnu_inner_type);
2519 TYPE_MAX_VALUE (gnu_subtype)
2520 = TYPE_MAX_VALUE (gnu_inner_type);
2521 TYPE_PRECISION (gnu_subtype)
2522 = TYPE_PRECISION (gnu_inner_type);
2523 TYPE_UNSIGNED (gnu_subtype)
2524 = TYPE_UNSIGNED (gnu_inner_type);
2525 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2526 layout_type (gnu_subtype);
2528 gnu_inner_type = gnu_subtype;
2531 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2534 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2536 for (gnat_index = First_Index (gnat_entity);
2537 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2538 SET_TYPE_ACTUAL_BOUNDS
2540 tree_cons (NULL_TREE,
2541 get_unpadded_type (Etype (gnat_index)),
2542 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2544 if (Convention (gnat_entity) != Convention_Fortran)
2545 SET_TYPE_ACTUAL_BOUNDS
2547 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2549 if (TREE_CODE (gnu_type) == RECORD_TYPE
2550 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2551 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2555 /* Abort if packed array with no packed array type field set. */
2557 gcc_assert (!Is_Packed (gnat_entity));
2561 case E_String_Literal_Subtype:
2562 /* Create the type for a string literal. */
2564 Entity_Id gnat_full_type
2565 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2566 && Present (Full_View (Etype (gnat_entity)))
2567 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2568 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2569 tree gnu_string_array_type
2570 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2571 tree gnu_string_index_type
2572 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2573 (TYPE_DOMAIN (gnu_string_array_type))));
2574 tree gnu_lower_bound
2575 = convert (gnu_string_index_type,
2576 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2577 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2578 tree gnu_length = ssize_int (length - 1);
2579 tree gnu_upper_bound
2580 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2582 convert (gnu_string_index_type, gnu_length));
2584 = build_range_type (gnu_string_index_type,
2585 gnu_lower_bound, gnu_upper_bound);
2587 = create_index_type (convert (sizetype,
2588 TYPE_MIN_VALUE (gnu_range_type)),
2590 TYPE_MAX_VALUE (gnu_range_type)),
2591 gnu_range_type, gnat_entity);
2594 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2596 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2597 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2598 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2602 /* Record Types and Subtypes
2604 The following fields are defined on record types:
2606 Has_Discriminants True if the record has discriminants
2607 First_Discriminant Points to head of list of discriminants
2608 First_Entity Points to head of list of fields
2609 Is_Tagged_Type True if the record is tagged
2611 Implementation of Ada records and discriminated records:
2613 A record type definition is transformed into the equivalent of a C
2614 struct definition. The fields that are the discriminants which are
2615 found in the Full_Type_Declaration node and the elements of the
2616 Component_List found in the Record_Type_Definition node. The
2617 Component_List can be a recursive structure since each Variant of
2618 the Variant_Part of the Component_List has a Component_List.
2620 Processing of a record type definition comprises starting the list of
2621 field declarations here from the discriminants and the calling the
2622 function components_to_record to add the rest of the fields from the
2623 component list and return the gnu type node. The function
2624 components_to_record will call itself recursively as it traverses
2628 if (Has_Complex_Representation (gnat_entity))
2631 = build_complex_type
2633 (Etype (Defining_Entity
2634 (First (Component_Items
2637 (Declaration_Node (gnat_entity)))))))));
2643 Node_Id full_definition = Declaration_Node (gnat_entity);
2644 Node_Id record_definition = Type_Definition (full_definition);
2645 Entity_Id gnat_field;
2647 tree gnu_field_list = NULL_TREE;
2648 tree gnu_get_parent;
2649 /* Set PACKED in keeping with gnat_to_gnu_field. */
2651 = Is_Packed (gnat_entity)
2653 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2655 : (Known_Alignment (gnat_entity)
2656 || (Strict_Alignment (gnat_entity)
2657 && Known_Static_Esize (gnat_entity)))
2660 bool has_rep = Has_Specified_Layout (gnat_entity);
2661 bool all_rep = has_rep;
2663 = (Is_Tagged_Type (gnat_entity)
2664 && Nkind (record_definition) == N_Derived_Type_Definition);
2666 /* See if all fields have a rep clause. Stop when we find one
2668 for (gnat_field = First_Entity (gnat_entity);
2669 Present (gnat_field) && all_rep;
2670 gnat_field = Next_Entity (gnat_field))
2671 if ((Ekind (gnat_field) == E_Component
2672 || Ekind (gnat_field) == E_Discriminant)
2673 && No (Component_Clause (gnat_field)))
2676 /* If this is a record extension, go a level further to find the
2677 record definition. Also, verify we have a Parent_Subtype. */
2680 if (!type_annotate_only
2681 || Present (Record_Extension_Part (record_definition)))
2682 record_definition = Record_Extension_Part (record_definition);
2684 gcc_assert (type_annotate_only
2685 || Present (Parent_Subtype (gnat_entity)));
2688 /* Make a node for the record. If we are not defining the record,
2689 suppress expanding incomplete types. */
2690 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2691 TYPE_NAME (gnu_type) = gnu_entity_id;
2692 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2695 defer_incomplete_level++, this_deferred = true;
2697 /* If both a size and rep clause was specified, put the size in
2698 the record type now so that it can get the proper mode. */
2699 if (has_rep && Known_Esize (gnat_entity))
2700 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2702 /* Always set the alignment here so that it can be used to
2703 set the mode, if it is making the alignment stricter. If
2704 it is invalid, it will be checked again below. If this is to
2705 be Atomic, choose a default alignment of a word unless we know
2706 the size and it's smaller. */
2707 if (Known_Alignment (gnat_entity))
2708 TYPE_ALIGN (gnu_type)
2709 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2710 else if (Is_Atomic (gnat_entity))
2711 TYPE_ALIGN (gnu_type)
2712 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2713 /* If a type needs strict alignment, the minimum size will be the
2714 type size instead of the RM size (see validate_size). Cap the
2715 alignment, lest it causes this type size to become too large. */
2716 else if (Strict_Alignment (gnat_entity)
2717 && Known_Static_Esize (gnat_entity))
2719 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2720 unsigned int raw_align = raw_size & -raw_size;
2721 if (raw_align < BIGGEST_ALIGNMENT)
2722 TYPE_ALIGN (gnu_type) = raw_align;
2725 TYPE_ALIGN (gnu_type) = 0;
2727 /* If we have a Parent_Subtype, make a field for the parent. If
2728 this record has rep clauses, force the position to zero. */
2729 if (Present (Parent_Subtype (gnat_entity)))
2731 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2734 /* A major complexity here is that the parent subtype will
2735 reference our discriminants in its Discriminant_Constraint
2736 list. But those must reference the parent component of this
2737 record which is of the parent subtype we have not built yet!
2738 To break the circle we first build a dummy COMPONENT_REF which
2739 represents the "get to the parent" operation and initialize
2740 each of those discriminants to a COMPONENT_REF of the above
2741 dummy parent referencing the corresponding discriminant of the
2742 base type of the parent subtype. */
2743 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2744 build0 (PLACEHOLDER_EXPR, gnu_type),
2745 build_decl (FIELD_DECL, NULL_TREE,
2749 if (Has_Discriminants (gnat_entity))
2750 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2751 Present (gnat_field);
2752 gnat_field = Next_Stored_Discriminant (gnat_field))
2753 if (Present (Corresponding_Discriminant (gnat_field)))
2756 build3 (COMPONENT_REF,
2757 get_unpadded_type (Etype (gnat_field)),
2759 gnat_to_gnu_field_decl (Corresponding_Discriminant
2764 /* Then we build the parent subtype. If it has discriminants but
2765 the type itself has unknown discriminants, this means that it
2766 doesn't contain information about how the discriminants are
2767 derived from those of the ancestor type, so it cannot be used
2768 directly. Instead it is built by cloning the parent subtype
2769 of the underlying record view of the type, for which the above
2770 derivation of discriminants has been made explicit. */
2771 if (Has_Discriminants (gnat_parent)
2772 && Has_Unknown_Discriminants (gnat_entity))
2774 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2776 /* If we are defining the type, the underlying record
2777 view must already have been elaborated at this point.
2778 Otherwise do it now as its parent subtype cannot be
2779 technically elaborated on its own. */
2781 gcc_assert (present_gnu_tree (gnat_uview));
2783 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2785 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2787 /* Substitute the "get to the parent" of the type for that
2788 of its underlying record view in the cloned type. */
2789 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2790 Present (gnat_field);
2791 gnat_field = Next_Stored_Discriminant (gnat_field))
2792 if (Present (Corresponding_Discriminant (gnat_field)))
2794 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2796 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2797 gnu_get_parent, gnu_field, NULL_TREE);
2799 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2803 gnu_parent = gnat_to_gnu_type (gnat_parent);
2805 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2806 initially built. The discriminants must reference the fields
2807 of the parent subtype and not those of its base type for the
2808 placeholder machinery to properly work. */
2809 if (Has_Discriminants (gnat_entity))
2810 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2811 Present (gnat_field);
2812 gnat_field = Next_Stored_Discriminant (gnat_field))
2813 if (Present (Corresponding_Discriminant (gnat_field)))
2815 Entity_Id field = Empty;
2816 for (field = First_Stored_Discriminant (gnat_parent);
2818 field = Next_Stored_Discriminant (field))
2819 if (same_discriminant_p (gnat_field, field))
2821 gcc_assert (Present (field));
2822 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2823 = gnat_to_gnu_field_decl (field);
2826 /* The "get to the parent" COMPONENT_REF must be given its
2828 TREE_TYPE (gnu_get_parent) = gnu_parent;
2830 /* ...and reference the _parent field of this record. */
2832 = create_field_decl (get_identifier
2833 (Get_Name_String (Name_uParent)),
2834 gnu_parent, gnu_type, 0,
2835 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2836 has_rep ? bitsize_zero_node : 0, 1);
2837 DECL_INTERNAL_P (gnu_field_list) = 1;
2838 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2841 /* Make the fields for the discriminants and put them into the record
2842 unless it's an Unchecked_Union. */
2843 if (Has_Discriminants (gnat_entity))
2844 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2845 Present (gnat_field);
2846 gnat_field = Next_Stored_Discriminant (gnat_field))
2848 /* If this is a record extension and this discriminant
2849 is the renaming of another discriminant, we've already
2850 handled the discriminant above. */
2851 if (Present (Parent_Subtype (gnat_entity))
2852 && Present (Corresponding_Discriminant (gnat_field)))
2856 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2858 /* Make an expression using a PLACEHOLDER_EXPR from the
2859 FIELD_DECL node just created and link that with the
2860 corresponding GNAT defining identifier. Then add to the
2862 save_gnu_tree (gnat_field,
2863 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2864 build0 (PLACEHOLDER_EXPR,
2865 DECL_CONTEXT (gnu_field)),
2866 gnu_field, NULL_TREE),
2869 if (!Is_Unchecked_Union (gnat_entity))
2871 TREE_CHAIN (gnu_field) = gnu_field_list;
2872 gnu_field_list = gnu_field;
2876 /* Put the discriminants into the record (backwards), so we can
2877 know the appropriate discriminant to use for the names of the
2879 TYPE_FIELDS (gnu_type) = gnu_field_list;
2881 /* Add the listed fields into the record and finish it up. */
2882 components_to_record (gnu_type, Component_List (record_definition),
2883 gnu_field_list, packed, definition, NULL,
2884 false, all_rep, false,
2885 Is_Unchecked_Union (gnat_entity));
2887 /* We used to remove the associations of the discriminants and
2888 _Parent for validity checking, but we may need them if there's
2889 Freeze_Node for a subtype used in this record. */
2890 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2891 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2893 /* If it is a tagged record force the type to BLKmode to insure
2894 that these objects will always be placed in memory. Do the
2895 same thing for limited record types. */
2896 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2897 SET_TYPE_MODE (gnu_type, BLKmode);
2899 /* Fill in locations of fields. */
2900 annotate_rep (gnat_entity, gnu_type);
2902 /* If there are any entities in the chain corresponding to
2903 components that we did not elaborate, ensure we elaborate their
2904 types if they are Itypes. */
2905 for (gnat_temp = First_Entity (gnat_entity);
2906 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2907 if ((Ekind (gnat_temp) == E_Component
2908 || Ekind (gnat_temp) == E_Discriminant)
2909 && Is_Itype (Etype (gnat_temp))
2910 && !present_gnu_tree (gnat_temp))
2911 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2915 case E_Class_Wide_Subtype:
2916 /* If an equivalent type is present, that is what we should use.
2917 Otherwise, fall through to handle this like a record subtype
2918 since it may have constraints. */
2919 if (gnat_equiv_type != gnat_entity)
2921 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2922 maybe_present = true;
2926 /* ... fall through ... */
2928 case E_Record_Subtype:
2930 /* If Cloned_Subtype is Present it means this record subtype has
2931 identical layout to that type or subtype and we should use
2932 that GCC type for this one. The front end guarantees that
2933 the component list is shared. */
2934 if (Present (Cloned_Subtype (gnat_entity)))
2936 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2938 maybe_present = true;
2941 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2942 changing the type, make a new type with each field having the
2943 type of the field in the new subtype but having the position
2944 computed by transforming every discriminant reference according
2945 to the constraints. We don't see any difference between
2946 private and nonprivate type here since derivations from types should
2947 have been deferred until the completion of the private type. */
2950 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2955 defer_incomplete_level++, this_deferred = true;
2957 /* Get the base type initially for its alignment and sizes. But
2958 if it is a padded type, we do all the other work with the
2960 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
2962 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
2963 && TYPE_IS_PADDING_P (gnu_base_type))
2964 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
2966 gnu_type = gnu_orig_type = gnu_base_type;
2968 if (present_gnu_tree (gnat_entity))
2970 maybe_present = true;
2974 /* When the type has discriminants, and these discriminants
2975 affect the shape of what it built, factor them in.
2977 If we are making a subtype of an Unchecked_Union (must be an
2978 Itype), just return the type.
2980 We can't just use Is_Constrained because private subtypes without
2981 discriminants of full types with discriminants with default
2982 expressions are Is_Constrained but aren't constrained! */
2984 if (IN (Ekind (gnat_base_type), Record_Kind)
2985 && !Is_For_Access_Subtype (gnat_entity)
2986 && !Is_Unchecked_Union (gnat_base_type)
2987 && Is_Constrained (gnat_entity)
2988 && Stored_Constraint (gnat_entity) != No_Elist
2989 && Present (Discriminant_Constraint (gnat_entity)))
2991 Entity_Id gnat_field;
2992 tree gnu_field_list = 0;
2994 = compute_field_positions (gnu_orig_type, NULL_TREE,
2995 size_zero_node, bitsize_zero_node,
2998 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
3002 gnu_type = make_node (RECORD_TYPE);
3003 TYPE_NAME (gnu_type) = gnu_entity_id;
3004 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3006 /* Set the size, alignment and alias set of the new type to
3007 match that of the old one, doing required substitutions.
3008 We do it this early because we need the size of the new
3009 type below to discard old fields if necessary. */
3010 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
3011 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
3012 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
3013 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
3014 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
3016 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3017 for (gnu_temp = gnu_subst_list;
3018 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3019 TYPE_SIZE (gnu_type)
3020 = substitute_in_expr (TYPE_SIZE (gnu_type),
3021 TREE_PURPOSE (gnu_temp),
3022 TREE_VALUE (gnu_temp));
3024 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
3025 for (gnu_temp = gnu_subst_list;
3026 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3027 TYPE_SIZE_UNIT (gnu_type)
3028 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
3029 TREE_PURPOSE (gnu_temp),
3030 TREE_VALUE (gnu_temp));
3032 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
3033 for (gnu_temp = gnu_subst_list;
3034 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3036 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3037 TREE_PURPOSE (gnu_temp),
3038 TREE_VALUE (gnu_temp)));
3040 for (gnat_field = First_Entity (gnat_entity);
3041 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3042 if ((Ekind (gnat_field) == E_Component
3043 || Ekind (gnat_field) == E_Discriminant)
3044 && (Underlying_Type (Scope (Original_Record_Component
3047 && (No (Corresponding_Discriminant (gnat_field))
3048 || !Is_Tagged_Type (gnat_base_type)))
3051 = gnat_to_gnu_field_decl (Original_Record_Component
3054 = TREE_VALUE (purpose_member (gnu_old_field,
3056 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3057 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3059 = gnat_to_gnu_type (Etype (gnat_field));
3060 tree gnu_size = TYPE_SIZE (gnu_field_type);
3061 tree gnu_new_pos = NULL_TREE;
3062 unsigned int offset_align
3063 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
3067 /* If there was a component clause, the field types must be
3068 the same for the type and subtype, so copy the data from
3069 the old field to avoid recomputation here. Also if the
3070 field is justified modular and the optimization in
3071 gnat_to_gnu_field was applied. */
3072 if (Present (Component_Clause
3073 (Original_Record_Component (gnat_field)))
3074 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3075 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3076 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3077 == TREE_TYPE (gnu_old_field)))
3079 gnu_size = DECL_SIZE (gnu_old_field);
3080 gnu_field_type = TREE_TYPE (gnu_old_field);
3083 /* If the old field was packed and of constant size, we
3084 have to get the old size here, as it might differ from
3085 what the Etype conveys and the latter might overlap
3086 onto the following field. Try to arrange the type for
3087 possible better packing along the way. */
3088 else if (DECL_PACKED (gnu_old_field)
3089 && TREE_CODE (DECL_SIZE (gnu_old_field))
3092 gnu_size = DECL_SIZE (gnu_old_field);
3093 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3094 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
3095 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3097 = make_packable_type (gnu_field_type, true);
3100 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3101 for (gnu_temp = gnu_subst_list;
3102 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3103 gnu_pos = substitute_in_expr (gnu_pos,
3104 TREE_PURPOSE (gnu_temp),
3105 TREE_VALUE (gnu_temp));
3107 /* If the position is now a constant, we can set it as the
3108 position of the field when we make it. Otherwise, we need
3109 to deal with it specially below. */
3110 if (TREE_CONSTANT (gnu_pos))
3112 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3114 /* Discard old fields that are outside the new type.
3115 This avoids confusing code scanning it to decide
3116 how to pass it to functions on some platforms. */
3117 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3118 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3119 && !integer_zerop (gnu_size)
3120 && !tree_int_cst_lt (gnu_new_pos,
3121 TYPE_SIZE (gnu_type)))
3127 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3128 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3129 !DECL_NONADDRESSABLE_P (gnu_old_field));
3131 if (!TREE_CONSTANT (gnu_pos))
3133 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3134 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3135 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3136 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3137 DECL_SIZE (gnu_field) = gnu_size;
3138 DECL_SIZE_UNIT (gnu_field)
3139 = convert (sizetype,
3140 size_binop (CEIL_DIV_EXPR, gnu_size,
3141 bitsize_unit_node));
3142 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3145 DECL_INTERNAL_P (gnu_field)
3146 = DECL_INTERNAL_P (gnu_old_field);
3147 SET_DECL_ORIGINAL_FIELD
3148 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3149 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3151 DECL_DISCRIMINANT_NUMBER (gnu_field)
3152 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3153 TREE_THIS_VOLATILE (gnu_field)
3154 = TREE_THIS_VOLATILE (gnu_old_field);
3156 /* To match the layout crafted in components_to_record, if
3157 this is the _Tag field, put it before any discriminants
3158 instead of after them as for all other fields. */
3159 if (Chars (gnat_field) == Name_uTag)
3160 gnu_field_list = chainon (gnu_field_list, gnu_field);
3163 TREE_CHAIN (gnu_field) = gnu_field_list;
3164 gnu_field_list = gnu_field;
3167 save_gnu_tree (gnat_field, gnu_field, false);
3170 /* Now go through the entities again looking for Itypes that
3171 we have not elaborated but should (e.g., Etypes of fields
3172 that have Original_Components). */
3173 for (gnat_field = First_Entity (gnat_entity);
3174 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3175 if ((Ekind (gnat_field) == E_Discriminant
3176 || Ekind (gnat_field) == E_Component)
3177 && !present_gnu_tree (Etype (gnat_field)))
3178 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3180 /* Do not finalize it since we're going to modify it below. */
3181 gnu_field_list = nreverse (gnu_field_list);
3182 finish_record_type (gnu_type, gnu_field_list, 2, true);
3184 /* Finalize size and mode. */
3185 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3186 TYPE_SIZE_UNIT (gnu_type)
3187 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3189 compute_record_mode (gnu_type);
3191 /* Fill in locations of fields. */
3192 annotate_rep (gnat_entity, gnu_type);
3194 /* We've built a new type, make an XVS type to show what this
3195 is a subtype of. Some debuggers require the XVS type to be
3196 output first, so do it in that order. */
3199 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3200 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
3202 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
3203 gnu_orig_name = DECL_NAME (gnu_orig_name);
3205 TYPE_NAME (gnu_subtype_marker)
3206 = create_concat_name (gnat_entity, "XVS");
3207 finish_record_type (gnu_subtype_marker,
3208 create_field_decl (gnu_orig_name,
3215 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3216 gnu_subtype_marker);
3219 /* Now we can finalize it. */
3220 rest_of_record_type_compilation (gnu_type);
3223 /* Otherwise, go down all the components in the new type and
3224 make them equivalent to those in the base type. */
3226 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3227 gnat_temp = Next_Entity (gnat_temp))
3228 if ((Ekind (gnat_temp) == E_Discriminant
3229 && !Is_Unchecked_Union (gnat_base_type))
3230 || Ekind (gnat_temp) == E_Component)
3231 save_gnu_tree (gnat_temp,
3232 gnat_to_gnu_field_decl
3233 (Original_Record_Component (gnat_temp)), false);
3237 case E_Access_Subprogram_Type:
3238 /* Use the special descriptor type for dispatch tables if needed,
3239 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3240 Note that we are only required to do so for static tables in
3241 order to be compatible with the C++ ABI, but Ada 2005 allows
3242 to extend library level tagged types at the local level so
3243 we do it in the non-static case as well. */
3244 if (TARGET_VTABLE_USES_DESCRIPTORS
3245 && Is_Dispatch_Table_Entity (gnat_entity))
3247 gnu_type = fdesc_type_node;
3248 gnu_size = TYPE_SIZE (gnu_type);
3252 /* ... fall through ... */
3254 case E_Anonymous_Access_Subprogram_Type:
3255 /* If we are not defining this entity, and we have incomplete
3256 entities being processed above us, make a dummy type and
3257 fill it in later. */
3258 if (!definition && defer_incomplete_level != 0)
3260 struct incomplete *p
3261 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3264 = build_pointer_type
3265 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3266 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3267 !Comes_From_Source (gnat_entity),
3268 debug_info_p, gnat_entity);
3269 this_made_decl = true;
3270 gnu_type = TREE_TYPE (gnu_decl);
3271 save_gnu_tree (gnat_entity, gnu_decl, false);
3274 p->old_type = TREE_TYPE (gnu_type);
3275 p->full_type = Directly_Designated_Type (gnat_entity);
3276 p->next = defer_incomplete_list;
3277 defer_incomplete_list = p;
3281 /* ... fall through ... */
3283 case E_Allocator_Type:
3285 case E_Access_Attribute_Type:
3286 case E_Anonymous_Access_Type:
3287 case E_General_Access_Type:
3289 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3290 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3291 bool is_from_limited_with
3292 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3293 && From_With_Type (gnat_desig_equiv));
3295 /* Get the "full view" of this entity. If this is an incomplete
3296 entity from a limited with, treat its non-limited view as the full
3297 view. Otherwise, if this is an incomplete or private type, use the
3298 full view. In the former case, we might point to a private type,
3299 in which case, we need its full view. Also, we want to look at the
3300 actual type used for the representation, so this takes a total of
3302 Entity_Id gnat_desig_full_direct_first
3303 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3304 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3305 ? Full_View (gnat_desig_equiv) : Empty));
3306 Entity_Id gnat_desig_full_direct
3307 = ((is_from_limited_with
3308 && Present (gnat_desig_full_direct_first)
3309 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3310 ? Full_View (gnat_desig_full_direct_first)
3311 : gnat_desig_full_direct_first);
3312 Entity_Id gnat_desig_full
3313 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3315 /* This the type actually used to represent the designated type,
3316 either gnat_desig_full or gnat_desig_equiv. */
3317 Entity_Id gnat_desig_rep;
3319 /* True if this is a pointer to an unconstrained array. */
3320 bool is_unconstrained_array;
3322 /* We want to know if we'll be seeing the freeze node for any
3323 incomplete type we may be pointing to. */
3325 = (Present (gnat_desig_full)
3326 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3327 : In_Extended_Main_Code_Unit (gnat_desig_type));
3329 /* True if we make a dummy type here. */
3330 bool got_fat_p = false;
3331 /* True if the dummy is a fat pointer. */
3332 bool made_dummy = false;
3333 tree gnu_desig_type = NULL_TREE;
3334 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3336 if (!targetm.valid_pointer_mode (p_mode))
3339 /* If either the designated type or its full view is an unconstrained
3340 array subtype, replace it with the type it's a subtype of. This
3341 avoids problems with multiple copies of unconstrained array types.
3342 Likewise, if the designated type is a subtype of an incomplete
3343 record type, use the parent type to avoid order of elaboration
3344 issues. This can lose some code efficiency, but there is no
3346 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3347 && ! Is_Constrained (gnat_desig_equiv))
3348 gnat_desig_equiv = Etype (gnat_desig_equiv);
3349 if (Present (gnat_desig_full)
3350 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3351 && ! Is_Constrained (gnat_desig_full))
3352 || (Ekind (gnat_desig_full) == E_Record_Subtype
3353 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3354 gnat_desig_full = Etype (gnat_desig_full);
3356 /* Now set the type that actually marks the representation of
3357 the designated type and also flag whether we have a unconstrained
3359 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3360 is_unconstrained_array
3361 = (Is_Array_Type (gnat_desig_rep)
3362 && ! Is_Constrained (gnat_desig_rep));
3364 /* If we are pointing to an incomplete type whose completion is an
3365 unconstrained array, make a fat pointer type. The two types in our
3366 fields will be pointers to dummy nodes and will be replaced in
3367 update_pointer_to. Similarly, if the type itself is a dummy type or
3368 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3369 in case we have any thin pointers to it. */
3370 if (is_unconstrained_array
3371 && (Present (gnat_desig_full)
3372 || (present_gnu_tree (gnat_desig_equiv)
3373 && TYPE_IS_DUMMY_P (TREE_TYPE
3374 (get_gnu_tree (gnat_desig_equiv))))
3375 || (No (gnat_desig_full) && ! in_main_unit
3376 && defer_incomplete_level != 0
3377 && ! present_gnu_tree (gnat_desig_equiv))
3378 || (in_main_unit && is_from_limited_with
3379 && Present (Freeze_Node (gnat_desig_rep)))))
3382 = (present_gnu_tree (gnat_desig_rep)
3383 ? TREE_TYPE (get_gnu_tree (gnat_desig_rep))
3384 : make_dummy_type (gnat_desig_rep));
3387 /* Show the dummy we get will be a fat pointer. */
3388 got_fat_p = made_dummy = true;
3390 /* If the call above got something that has a pointer, that
3391 pointer is our type. This could have happened either
3392 because the type was elaborated or because somebody
3393 else executed the code below. */
3394 gnu_type = TYPE_POINTER_TO (gnu_old);
3397 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3398 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3399 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3400 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3402 TYPE_NAME (gnu_template_type)
3403 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3405 TYPE_DUMMY_P (gnu_template_type) = 1;
3407 TYPE_NAME (gnu_array_type)
3408 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3410 TYPE_DUMMY_P (gnu_array_type) = 1;
3412 gnu_type = make_node (RECORD_TYPE);
3413 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3414 TYPE_POINTER_TO (gnu_old) = gnu_type;
3416 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3418 = chainon (chainon (NULL_TREE,
3420 (get_identifier ("P_ARRAY"),
3422 gnu_type, 0, 0, 0, 0)),
3423 create_field_decl (get_identifier ("P_BOUNDS"),
3425 gnu_type, 0, 0, 0, 0));
3427 /* Make sure we can place this into a register. */
3428 TYPE_ALIGN (gnu_type)
3429 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3430 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3432 /* Do not finalize this record type since the types of
3433 its fields are incomplete. */
3434 finish_record_type (gnu_type, fields, 0, true);
3436 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3437 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3438 = concat_id_with_name (get_entity_name (gnat_desig_equiv),
3440 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3444 /* If we already know what the full type is, use it. */
3445 else if (Present (gnat_desig_full)
3446 && present_gnu_tree (gnat_desig_full))
3447 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3449 /* Get the type of the thing we are to point to and build a pointer
3450 to it. If it is a reference to an incomplete or private type with a
3451 full view that is a record, make a dummy type node and get the
3452 actual type later when we have verified it is safe. */
3453 else if ((! in_main_unit
3454 && ! present_gnu_tree (gnat_desig_equiv)
3455 && Present (gnat_desig_full)
3456 && ! present_gnu_tree (gnat_desig_full)
3457 && Is_Record_Type (gnat_desig_full))
3458 /* Likewise if we are pointing to a record or array and we
3459 are to defer elaborating incomplete types. We do this
3460 since this access type may be the full view of some
3461 private type. Note that the unconstrained array case is
3463 || ((! in_main_unit || imported_p)
3464 && defer_incomplete_level != 0
3465 && ! present_gnu_tree (gnat_desig_equiv)
3466 && ((Is_Record_Type (gnat_desig_rep)
3467 || Is_Array_Type (gnat_desig_rep))))
3468 /* If this is a reference from a limited_with type back to our
3469 main unit and there's a Freeze_Node for it, either we have
3470 already processed the declaration and made the dummy type,
3471 in which case we just reuse the latter, or we have not yet,
3472 in which case we make the dummy type and it will be reused
3473 when the declaration is processed. In both cases, the
3474 pointer eventually created below will be automatically
3475 adjusted when the Freeze_Node is processed. Note that the
3476 unconstrained array case is handled above. */
3477 || (in_main_unit && is_from_limited_with
3478 && Present (Freeze_Node (gnat_desig_rep))))
3480 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3484 /* Otherwise handle the case of a pointer to itself. */
3485 else if (gnat_desig_equiv == gnat_entity)
3488 = build_pointer_type_for_mode (void_type_node, p_mode,
3489 No_Strict_Aliasing (gnat_entity));
3490 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3493 /* If expansion is disabled, the equivalent type of a concurrent
3494 type is absent, so build a dummy pointer type. */
3495 else if (type_annotate_only && No (gnat_desig_equiv))
3496 gnu_type = ptr_void_type_node;
3498 /* Finally, handle the straightforward case where we can just
3499 elaborate our designated type and point to it. */
3501 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3503 /* It is possible that a call to gnat_to_gnu_type above resolved our
3504 type. If so, just return it. */
3505 if (present_gnu_tree (gnat_entity))
3507 maybe_present = true;
3511 /* If we have a GCC type for the designated type, possibly modify it
3512 if we are pointing only to constant objects and then make a pointer
3513 to it. Don't do this for unconstrained arrays. */
3514 if (!gnu_type && gnu_desig_type)
3516 if (Is_Access_Constant (gnat_entity)
3517 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3520 = build_qualified_type
3522 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3524 /* Some extra processing is required if we are building a
3525 pointer to an incomplete type (in the GCC sense). We might
3526 have such a type if we just made a dummy, or directly out
3527 of the call to gnat_to_gnu_type above if we are processing
3528 an access type for a record component designating the
3529 record type itself. */
3530 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3532 /* We must ensure that the pointer to variant we make will
3533 be processed by update_pointer_to when the initial type
3534 is completed. Pretend we made a dummy and let further
3535 processing act as usual. */
3538 /* We must ensure that update_pointer_to will not retrieve
3539 the dummy variant when building a properly qualified
3540 version of the complete type. We take advantage of the
3541 fact that get_qualified_type is requiring TYPE_NAMEs to
3542 match to influence build_qualified_type and then also
3543 update_pointer_to here. */
3544 TYPE_NAME (gnu_desig_type)
3545 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3550 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3551 No_Strict_Aliasing (gnat_entity));
3554 /* If we are not defining this object and we made a dummy pointer,
3555 save our current definition, evaluate the actual type, and replace
3556 the tentative type we made with the actual one. If we are to defer
3557 actually looking up the actual type, make an entry in the
3558 deferred list. If this is from a limited with, we have to defer
3559 to the end of the current spec in two cases: first if the
3560 designated type is in the current unit and second if the access
3562 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3565 = TYPE_FAT_POINTER_P (gnu_type)
3566 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3568 if (esize == POINTER_SIZE
3569 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3571 = build_pointer_type
3572 (TYPE_OBJECT_RECORD_TYPE
3573 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3575 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3576 !Comes_From_Source (gnat_entity),
3577 debug_info_p, gnat_entity);
3578 this_made_decl = true;
3579 gnu_type = TREE_TYPE (gnu_decl);
3580 save_gnu_tree (gnat_entity, gnu_decl, false);
3583 if (defer_incomplete_level == 0
3584 && ! (is_from_limited_with
3586 || In_Extended_Main_Code_Unit (gnat_entity))))
3587 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3588 gnat_to_gnu_type (gnat_desig_equiv));
3590 /* Note that the call to gnat_to_gnu_type here might have
3591 updated gnu_old_type directly, in which case it is not a
3592 dummy type any more when we get into update_pointer_to.
3594 This may happen for instance when the designated type is a
3595 record type, because their elaboration starts with an
3596 initial node from make_dummy_type, which may yield the same
3597 node as the one we got.
3599 Besides, variants of this non-dummy type might have been
3600 created along the way. update_pointer_to is expected to
3601 properly take care of those situations. */
3604 struct incomplete *p
3605 = (struct incomplete *) xmalloc (sizeof
3606 (struct incomplete));
3607 struct incomplete **head
3608 = (is_from_limited_with
3610 || In_Extended_Main_Code_Unit (gnat_entity))
3611 ? &defer_limited_with : &defer_incomplete_list);
3613 p->old_type = gnu_old_type;
3614 p->full_type = gnat_desig_equiv;
3622 case E_Access_Protected_Subprogram_Type:
3623 case E_Anonymous_Access_Protected_Subprogram_Type:
3624 if (type_annotate_only && No (gnat_equiv_type))
3625 gnu_type = ptr_void_type_node;
3628 /* The runtime representation is the equivalent type. */
3629 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3630 maybe_present = true;
3633 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3634 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3635 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3636 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3637 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3642 case E_Access_Subtype:
3644 /* We treat this as identical to its base type; any constraint is
3645 meaningful only to the front end.
3647 The designated type must be elaborated as well, if it does
3648 not have its own freeze node. Designated (sub)types created
3649 for constrained components of records with discriminants are
3650 not frozen by the front end and thus not elaborated by gigi,
3651 because their use may appear before the base type is frozen,
3652 and because it is not clear that they are needed anywhere in
3653 Gigi. With the current model, there is no correct place where
3654 they could be elaborated. */
3656 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3657 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3658 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3659 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3660 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3662 /* If we are not defining this entity, and we have incomplete
3663 entities being processed above us, make a dummy type and
3664 elaborate it later. */
3665 if (!definition && defer_incomplete_level != 0)
3667 struct incomplete *p
3668 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3670 = build_pointer_type
3671 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3673 p->old_type = TREE_TYPE (gnu_ptr_type);
3674 p->full_type = Directly_Designated_Type (gnat_entity);
3675 p->next = defer_incomplete_list;
3676 defer_incomplete_list = p;
3678 else if (!IN (Ekind (Base_Type
3679 (Directly_Designated_Type (gnat_entity))),
3680 Incomplete_Or_Private_Kind))
3681 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3685 maybe_present = true;
3688 /* Subprogram Entities
3690 The following access functions are defined for subprograms (functions
3693 First_Formal The first formal parameter.
3694 Is_Imported Indicates that the subprogram has appeared in
3695 an INTERFACE or IMPORT pragma. For now we
3696 assume that the external language is C.
3697 Is_Exported Likewise but for an EXPORT pragma.
3698 Is_Inlined True if the subprogram is to be inlined.
3700 In addition for function subprograms we have:
3702 Etype Return type of the function.
3704 Each parameter is first checked by calling must_pass_by_ref on its
3705 type to determine if it is passed by reference. For parameters which
3706 are copied in, if they are Ada In Out or Out parameters, their return
3707 value becomes part of a record which becomes the return type of the
3708 function (C function - note that this applies only to Ada procedures
3709 so there is no Ada return type). Additional code to store back the
3710 parameters will be generated on the caller side. This transformation
3711 is done here, not in the front-end.
3713 The intended result of the transformation can be seen from the
3714 equivalent source rewritings that follow:
3716 struct temp {int a,b};
3717 procedure P (A,B: In Out ...) is temp P (int A,B)
3720 end P; return {A,B};
3727 For subprogram types we need to perform mainly the same conversions to
3728 GCC form that are needed for procedures and function declarations. The
3729 only difference is that at the end, we make a type declaration instead
3730 of a function declaration. */
3732 case E_Subprogram_Type:
3736 /* The first GCC parameter declaration (a PARM_DECL node). The
3737 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3738 actually is the head of this parameter list. */
3739 tree gnu_param_list = NULL_TREE;
3740 /* Likewise for the stub associated with an exported procedure. */
3741 tree gnu_stub_param_list = NULL_TREE;
3742 /* The type returned by a function. If the subprogram is a procedure
3743 this type should be void_type_node. */
3744 tree gnu_return_type = void_type_node;
3745 /* List of fields in return type of procedure with copy-in copy-out
3747 tree gnu_field_list = NULL_TREE;
3748 /* Non-null for subprograms containing parameters passed by copy-in
3749 copy-out (Ada In Out or Out parameters not passed by reference),
3750 in which case it is the list of nodes used to specify the values of
3751 the in out/out parameters that are returned as a record upon
3752 procedure return. The TREE_PURPOSE of an element of this list is
3753 a field of the record and the TREE_VALUE is the PARM_DECL
3754 corresponding to that field. This list will be saved in the
3755 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3756 tree gnu_return_list = NULL_TREE;
3757 /* If an import pragma asks to map this subprogram to a GCC builtin,
3758 this is the builtin DECL node. */
3759 tree gnu_builtin_decl = NULL_TREE;
3760 /* For the stub associated with an exported procedure. */
3761 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3762 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3763 Entity_Id gnat_param;
3764 bool inline_flag = Is_Inlined (gnat_entity);
3765 bool public_flag = Is_Public (gnat_entity) || imported_p;
3767 = (Is_Public (gnat_entity) && !definition) || imported_p;
3769 /* The semantics of "pure" in Ada essentially matches that of "const"
3770 in the back-end. In particular, both properties are orthogonal to
3771 the "nothrow" property if the EH circuitry is explicit in the
3772 internal representation of the back-end. If we are to completely
3773 hide the EH circuitry from it, we need to declare that calls to pure
3774 Ada subprograms that can throw have side effects since they can
3775 trigger an "abnormal" transfer of control flow; thus they can be
3776 neither "const" nor "pure" in the back-end sense. */
3778 = (Exception_Mechanism == Back_End_Exceptions
3779 && Is_Pure (gnat_entity));
3781 bool volatile_flag = No_Return (gnat_entity);
3782 bool returns_by_ref = false;
3783 bool returns_unconstrained = false;
3784 bool returns_by_target_ptr = false;
3785 bool has_copy_in_out = false;
3786 bool has_stub = false;
3789 if (kind == E_Subprogram_Type && !definition)
3790 /* A parameter may refer to this type, so defer completion
3791 of any incomplete types. */
3792 defer_incomplete_level++, this_deferred = true;
3794 /* If the subprogram has an alias, it is probably inherited, so
3795 we can use the original one. If the original "subprogram"
3796 is actually an enumeration literal, it may be the first use
3797 of its type, so we must elaborate that type now. */
3798 if (Present (Alias (gnat_entity)))
3800 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3801 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3803 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3806 /* Elaborate any Itypes in the parameters of this entity. */
3807 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3808 Present (gnat_temp);
3809 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3810 if (Is_Itype (Etype (gnat_temp)))
3811 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3816 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3817 corresponding DECL node.
3819 We still want the parameter associations to take place because the
3820 proper generation of calls depends on it (a GNAT parameter without
3821 a corresponding GCC tree has a very specific meaning), so we don't
3823 if (Convention (gnat_entity) == Convention_Intrinsic)
3824 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3826 /* ??? What if we don't find the builtin node above ? warn ? err ?
3827 In the current state we neither warn nor err, and calls will just
3828 be handled as for regular subprograms. */
3830 if (kind == E_Function || kind == E_Subprogram_Type)
3831 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3833 /* If this function returns by reference, make the actual
3834 return type of this function the pointer and mark the decl. */
3835 if (Returns_By_Ref (gnat_entity))
3837 returns_by_ref = true;
3838 gnu_return_type = build_pointer_type (gnu_return_type);
3841 /* If the Mechanism is By_Reference, ensure the return type uses
3842 the machine's by-reference mechanism, which may not the same
3843 as above (e.g., it might be by passing a fake parameter). */
3844 else if (kind == E_Function
3845 && Mechanism (gnat_entity) == By_Reference)
3847 TREE_ADDRESSABLE (gnu_return_type) = 1;
3849 /* We expect this bit to be reset by gigi shortly, so can avoid a
3850 type node copy here. This actually also prevents troubles with
3851 the generation of debug information for the function, because
3852 we might have issued such info for this type already, and would
3853 be attaching a distinct type node to the function if we made a
3857 /* If we are supposed to return an unconstrained array,
3858 actually return a fat pointer and make a note of that. Return
3859 a pointer to an unconstrained record of variable size. */
3860 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3862 gnu_return_type = TREE_TYPE (gnu_return_type);
3863 returns_unconstrained = true;
3866 /* If the type requires a transient scope, the result is allocated
3867 on the secondary stack, so the result type of the function is
3869 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3871 gnu_return_type = build_pointer_type (gnu_return_type);
3872 returns_unconstrained = true;
3875 /* If the type is a padded type and the underlying type would not
3876 be passed by reference or this function has a foreign convention,
3877 return the underlying type. */
3878 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3879 && TYPE_IS_PADDING_P (gnu_return_type)
3880 && (!default_pass_by_ref (TREE_TYPE
3881 (TYPE_FIELDS (gnu_return_type)))
3882 || Has_Foreign_Convention (gnat_entity)))
3883 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3885 /* If the return type has a non-constant size, we convert the function
3886 into a procedure and its caller will pass a pointer to an object as
3887 the first parameter when we call the function. This can happen for
3888 an unconstrained type with a maximum size or a constrained type with
3889 a size not known at compile time. */
3890 if (TYPE_SIZE_UNIT (gnu_return_type)
3891 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
3893 returns_by_target_ptr = true;
3895 = create_param_decl (get_identifier ("TARGET"),
3896 build_reference_type (gnu_return_type),
3898 gnu_return_type = void_type_node;
3901 /* If the return type has a size that overflows, we cannot have
3902 a function that returns that type. This usage doesn't make
3903 sense anyway, so give an error here. */
3904 if (TYPE_SIZE_UNIT (gnu_return_type)
3905 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3906 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3908 post_error ("cannot return type whose size overflows",
3910 gnu_return_type = copy_node (gnu_return_type);
3911 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3912 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3913 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3914 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3917 /* Look at all our parameters and get the type of
3918 each. While doing this, build a copy-out structure if
3921 /* Loop over the parameters and get their associated GCC tree.
3922 While doing this, build a copy-out structure if we need one. */
3923 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
3924 Present (gnat_param);
3925 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3927 tree gnu_param_name = get_entity_name (gnat_param);
3928 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3929 tree gnu_param, gnu_field;
3930 bool copy_in_copy_out = false;
3931 Mechanism_Type mech = Mechanism (gnat_param);
3933 /* Builtins are expanded inline and there is no real call sequence
3934 involved. So the type expected by the underlying expander is
3935 always the type of each argument "as is". */
3936 if (gnu_builtin_decl)
3938 /* Handle the first parameter of a valued procedure specially. */
3939 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3940 mech = By_Copy_Return;
3941 /* Otherwise, see if a Mechanism was supplied that forced this
3942 parameter to be passed one way or another. */
3943 else if (mech == Default
3944 || mech == By_Copy || mech == By_Reference)
3946 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
3947 mech = By_Descriptor;
3949 else if (By_Short_Descriptor_Last <= mech &&
3950 mech <= By_Short_Descriptor)
3951 mech = By_Short_Descriptor;
3955 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
3956 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
3957 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
3959 mech = By_Reference;
3965 post_error ("unsupported mechanism for&", gnat_param);
3970 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
3971 Has_Foreign_Convention (gnat_entity),
3974 /* We are returned either a PARM_DECL or a type if no parameter
3975 needs to be passed; in either case, adjust the type. */
3976 if (DECL_P (gnu_param))
3977 gnu_param_type = TREE_TYPE (gnu_param);
3980 gnu_param_type = gnu_param;
3981 gnu_param = NULL_TREE;
3986 /* If it's an exported subprogram, we build a parameter list
3987 in parallel, in case we need to emit a stub for it. */
3988 if (Is_Exported (gnat_entity))
3991 = chainon (gnu_param, gnu_stub_param_list);
3992 /* Change By_Descriptor parameter to By_Reference for
3993 the internal version of an exported subprogram. */
3994 if (mech == By_Descriptor || mech == By_Short_Descriptor)
3997 = gnat_to_gnu_param (gnat_param, By_Reference,
4003 gnu_param = copy_node (gnu_param);
4006 gnu_param_list = chainon (gnu_param, gnu_param_list);
4007 Sloc_to_locus (Sloc (gnat_param),
4008 &DECL_SOURCE_LOCATION (gnu_param));
4009 save_gnu_tree (gnat_param, gnu_param, false);
4011 /* If a parameter is a pointer, this function may modify
4012 memory through it and thus shouldn't be considered
4013 a const function. Also, the memory may be modified
4014 between two calls, so they can't be CSE'ed. The latter
4015 case also handles by-ref parameters. */
4016 if (POINTER_TYPE_P (gnu_param_type)
4017 || TYPE_FAT_POINTER_P (gnu_param_type))
4021 if (copy_in_copy_out)
4023 if (!has_copy_in_out)
4025 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4026 gnu_return_type = make_node (RECORD_TYPE);
4027 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4028 has_copy_in_out = true;
4031 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4032 gnu_return_type, 0, 0, 0, 0);
4033 Sloc_to_locus (Sloc (gnat_param),
4034 &DECL_SOURCE_LOCATION (gnu_field));
4035 TREE_CHAIN (gnu_field) = gnu_field_list;
4036 gnu_field_list = gnu_field;
4037 gnu_return_list = tree_cons (gnu_field, gnu_param,
4042 /* Do not compute record for out parameters if subprogram is
4043 stubbed since structures are incomplete for the back-end. */
4044 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4045 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4048 /* If we have a CICO list but it has only one entry, we convert
4049 this function into a function that simply returns that one
4051 if (list_length (gnu_return_list) == 1)
4052 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
4054 if (Has_Stdcall_Convention (gnat_entity))
4055 prepend_one_attribute_to
4056 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4057 get_identifier ("stdcall"), NULL_TREE,
4060 /* If we are on a target where stack realignment is needed for 'main'
4061 to honor GCC's implicit expectations (stack alignment greater than
4062 what the base ABI guarantees), ensure we do the same for foreign
4063 convention subprograms as they might be used as callbacks from code
4064 breaking such expectations. Note that this applies to task entry
4065 points in particular. */
4066 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4067 && Has_Foreign_Convention (gnat_entity))
4068 prepend_one_attribute_to
4069 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4070 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4073 /* The lists have been built in reverse. */
4074 gnu_param_list = nreverse (gnu_param_list);
4076 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4077 gnu_return_list = nreverse (gnu_return_list);
4079 if (Ekind (gnat_entity) == E_Function)
4080 Set_Mechanism (gnat_entity,
4081 (returns_by_ref || returns_unconstrained
4082 ? By_Reference : By_Copy));
4084 = create_subprog_type (gnu_return_type, gnu_param_list,
4085 gnu_return_list, returns_unconstrained,
4086 returns_by_ref, returns_by_target_ptr);
4090 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4091 gnu_return_list, returns_unconstrained,
4092 returns_by_ref, returns_by_target_ptr);
4094 /* A subprogram (something that doesn't return anything) shouldn't
4095 be considered const since there would be no reason for such a
4096 subprogram. Note that procedures with Out (or In Out) parameters
4097 have already been converted into a function with a return type. */
4098 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4102 = build_qualified_type (gnu_type,
4103 TYPE_QUALS (gnu_type)
4104 | (TYPE_QUAL_CONST * const_flag)
4105 | (TYPE_QUAL_VOLATILE * volatile_flag));
4107 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4111 = build_qualified_type (gnu_stub_type,
4112 TYPE_QUALS (gnu_stub_type)
4113 | (TYPE_QUAL_CONST * const_flag)
4114 | (TYPE_QUAL_VOLATILE * volatile_flag));
4116 /* If we have a builtin decl for that function, check the signatures
4117 compatibilities. If the signatures are compatible, use the builtin
4118 decl. If they are not, we expect the checker predicate to have
4119 posted the appropriate errors, and just continue with what we have
4121 if (gnu_builtin_decl)
4123 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4125 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4127 gnu_decl = gnu_builtin_decl;
4128 gnu_type = gnu_builtin_type;
4133 /* If there was no specified Interface_Name and the external and
4134 internal names of the subprogram are the same, only use the
4135 internal name to allow disambiguation of nested subprograms. */
4136 if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_id)
4137 gnu_ext_name = NULL_TREE;
4139 /* If we are defining the subprogram and it has an Address clause
4140 we must get the address expression from the saved GCC tree for the
4141 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4142 the address expression here since the front-end has guaranteed
4143 in that case that the elaboration has no effects. If there is
4144 an Address clause and we are not defining the object, just
4145 make it a constant. */
4146 if (Present (Address_Clause (gnat_entity)))
4148 tree gnu_address = NULL_TREE;
4152 = (present_gnu_tree (gnat_entity)
4153 ? get_gnu_tree (gnat_entity)
4154 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4156 save_gnu_tree (gnat_entity, NULL_TREE, false);
4158 /* Convert the type of the object to a reference type that can
4159 alias everything as per 13.3(19). */
4161 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4163 gnu_address = convert (gnu_type, gnu_address);
4166 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
4167 gnu_address, false, Is_Public (gnat_entity),
4168 extern_flag, false, NULL, gnat_entity);
4169 DECL_BY_REF_P (gnu_decl) = 1;
4172 else if (kind == E_Subprogram_Type)
4173 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4174 !Comes_From_Source (gnat_entity),
4175 debug_info_p, gnat_entity);
4180 gnu_stub_name = gnu_ext_name;
4181 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4182 public_flag = false;
4185 gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name,
4186 gnu_type, gnu_param_list,
4187 inline_flag, public_flag,
4188 extern_flag, attr_list,
4193 = create_subprog_decl (gnu_entity_id, gnu_stub_name,
4194 gnu_stub_type, gnu_stub_param_list,
4196 extern_flag, attr_list,
4198 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4201 /* This is unrelated to the stub built right above. */
4202 DECL_STUBBED_P (gnu_decl)
4203 = Convention (gnat_entity) == Convention_Stubbed;
4208 case E_Incomplete_Type:
4209 case E_Incomplete_Subtype:
4210 case E_Private_Type:
4211 case E_Private_Subtype:
4212 case E_Limited_Private_Type:
4213 case E_Limited_Private_Subtype:
4214 case E_Record_Type_With_Private:
4215 case E_Record_Subtype_With_Private:
4217 /* Get the "full view" of this entity. If this is an incomplete
4218 entity from a limited with, treat its non-limited view as the
4219 full view. Otherwise, use either the full view or the underlying
4220 full view, whichever is present. This is used in all the tests
4223 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4224 && From_With_Type (gnat_entity))
4225 ? Non_Limited_View (gnat_entity)
4226 : Present (Full_View (gnat_entity))
4227 ? Full_View (gnat_entity)
4228 : Underlying_Full_View (gnat_entity);
4230 /* If this is an incomplete type with no full view, it must be a Taft
4231 Amendment type, in which case we return a dummy type. Otherwise,
4232 just get the type from its Etype. */
4235 if (kind == E_Incomplete_Type)
4237 gnu_type = make_dummy_type (gnat_entity);
4238 gnu_decl = TYPE_STUB_DECL (gnu_type);
4242 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4244 maybe_present = true;
4249 /* If we already made a type for the full view, reuse it. */
4250 else if (present_gnu_tree (full_view))
4252 gnu_decl = get_gnu_tree (full_view);
4256 /* Otherwise, if we are not defining the type now, get the type
4257 from the full view. But always get the type from the full view
4258 for define on use types, since otherwise we won't see them! */
4259 else if (!definition
4260 || (Is_Itype (full_view)
4261 && No (Freeze_Node (gnat_entity)))
4262 || (Is_Itype (gnat_entity)
4263 && No (Freeze_Node (full_view))))
4265 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4266 maybe_present = true;
4270 /* For incomplete types, make a dummy type entry which will be
4271 replaced later. Save it as the full declaration's type so
4272 we can do any needed updates when we see it. */
4273 gnu_type = make_dummy_type (gnat_entity);
4274 gnu_decl = TYPE_STUB_DECL (gnu_type);
4275 save_gnu_tree (full_view, gnu_decl, 0);
4279 /* Simple class_wide types are always viewed as their root_type
4280 by Gigi unless an Equivalent_Type is specified. */
4281 case E_Class_Wide_Type:
4282 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4283 maybe_present = true;
4287 case E_Task_Subtype:
4288 case E_Protected_Type:
4289 case E_Protected_Subtype:
4290 if (type_annotate_only && No (gnat_equiv_type))
4291 gnu_type = void_type_node;
4293 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4295 maybe_present = true;
4299 gnu_decl = create_label_decl (gnu_entity_id);
4304 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4305 we've already saved it, so we don't try to. */
4306 gnu_decl = error_mark_node;
4314 /* If we had a case where we evaluated another type and it might have
4315 defined this one, handle it here. */
4316 if (maybe_present && present_gnu_tree (gnat_entity))
4318 gnu_decl = get_gnu_tree (gnat_entity);
4322 /* If we are processing a type and there is either no decl for it or
4323 we just made one, do some common processing for the type, such as
4324 handling alignment and possible padding. */
4326 if ((!gnu_decl || this_made_decl) && IN (kind, Type_Kind))
4328 if (Is_Tagged_Type (gnat_entity)
4329 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4330 TYPE_ALIGN_OK (gnu_type) = 1;
4332 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4333 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4335 /* ??? Don't set the size for a String_Literal since it is either
4336 confirming or we don't handle it properly (if the low bound is
4338 if (!gnu_size && kind != E_String_Literal_Subtype)
4339 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4341 Has_Size_Clause (gnat_entity));
4343 /* If a size was specified, see if we can make a new type of that size
4344 by rearranging the type, for example from a fat to a thin pointer. */
4348 = make_type_from_size (gnu_type, gnu_size,
4349 Has_Biased_Representation (gnat_entity));
4351 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4352 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4356 /* If the alignment hasn't already been processed and this is
4357 not an unconstrained array, see if an alignment is specified.
4358 If not, we pick a default alignment for atomic objects. */
4359 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4361 else if (Known_Alignment (gnat_entity))
4363 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4364 TYPE_ALIGN (gnu_type));
4366 /* Warn on suspiciously large alignments. This should catch
4367 errors about the (alignment,byte)/(size,bit) discrepancy. */
4368 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4372 /* If a size was specified, take it into account. Otherwise
4373 use the RM size for records as the type size has already
4374 been adjusted to the alignment. */
4377 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4378 || TREE_CODE (gnu_type) == UNION_TYPE
4379 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4380 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4381 size = rm_size (gnu_type);
4383 size = TYPE_SIZE (gnu_type);
4385 /* Consider an alignment as suspicious if the alignment/size
4386 ratio is greater or equal to the byte/bit ratio. */
4387 if (host_integerp (size, 1)
4388 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4389 post_error_ne ("?suspiciously large alignment specified for&",
4390 Expression (Alignment_Clause (gnat_entity)),
4394 else if (Is_Atomic (gnat_entity) && !gnu_size
4395 && host_integerp (TYPE_SIZE (gnu_type), 1)
4396 && integer_pow2p (TYPE_SIZE (gnu_type)))
4397 align = MIN (BIGGEST_ALIGNMENT,
4398 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4399 else if (Is_Atomic (gnat_entity) && gnu_size
4400 && host_integerp (gnu_size, 1)
4401 && integer_pow2p (gnu_size))
4402 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4404 /* See if we need to pad the type. If we did, and made a record,
4405 the name of the new type may be changed. So get it back for
4406 us when we make the new TYPE_DECL below. */
4407 if (gnu_size || align > 0)
4408 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4409 "PAD", true, definition, false);
4411 if (TREE_CODE (gnu_type) == RECORD_TYPE
4412 && TYPE_IS_PADDING_P (gnu_type))
4414 gnu_entity_id = TYPE_NAME (gnu_type);
4415 if (TREE_CODE (gnu_entity_id) == TYPE_DECL)
4416 gnu_entity_id = DECL_NAME (gnu_entity_id);
4419 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4421 /* If we are at global level, GCC will have applied variable_size to
4422 the type, but that won't have done anything. So, if it's not
4423 a constant or self-referential, call elaborate_expression_1 to
4424 make a variable for the size rather than calculating it each time.
4425 Handle both the RM size and the actual size. */
4426 if (global_bindings_p ()
4427 && TYPE_SIZE (gnu_type)
4428 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4429 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4431 if (TREE_CODE (gnu_type) == RECORD_TYPE
4432 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4433 TYPE_SIZE (gnu_type), 0))
4435 TYPE_SIZE (gnu_type)
4436 = elaborate_expression_1 (gnat_entity, gnat_entity,
4437 TYPE_SIZE (gnu_type),
4438 get_identifier ("SIZE"),
4440 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4444 TYPE_SIZE (gnu_type)
4445 = elaborate_expression_1 (gnat_entity, gnat_entity,
4446 TYPE_SIZE (gnu_type),
4447 get_identifier ("SIZE"),
4450 /* ??? For now, store the size as a multiple of the alignment
4451 in bytes so that we can see the alignment from the tree. */
4452 TYPE_SIZE_UNIT (gnu_type)
4454 (MULT_EXPR, sizetype,
4455 elaborate_expression_1
4456 (gnat_entity, gnat_entity,
4457 build_binary_op (EXACT_DIV_EXPR, sizetype,
4458 TYPE_SIZE_UNIT (gnu_type),
4459 size_int (TYPE_ALIGN (gnu_type)
4461 get_identifier ("SIZE_A_UNIT"),
4463 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4465 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4468 elaborate_expression_1 (gnat_entity,
4470 TYPE_ADA_SIZE (gnu_type),
4471 get_identifier ("RM_SIZE"),
4476 /* If this is a record type or subtype, call elaborate_expression_1 on
4477 any field position. Do this for both global and local types.
4478 Skip any fields that we haven't made trees for to avoid problems with
4479 class wide types. */
4480 if (IN (kind, Record_Kind))
4481 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4482 gnat_temp = Next_Entity (gnat_temp))
4483 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4485 tree gnu_field = get_gnu_tree (gnat_temp);
4487 /* ??? Unfortunately, GCC needs to be able to prove the
4488 alignment of this offset and if it's a variable, it can't.
4489 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4490 right now, we have to put in an explicit multiply and
4491 divide by that value. */
4492 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4494 DECL_FIELD_OFFSET (gnu_field)
4496 (MULT_EXPR, sizetype,
4497 elaborate_expression_1
4498 (gnat_temp, gnat_temp,
4499 build_binary_op (EXACT_DIV_EXPR, sizetype,
4500 DECL_FIELD_OFFSET (gnu_field),
4501 size_int (DECL_OFFSET_ALIGN (gnu_field)
4503 get_identifier ("OFFSET"),
4505 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4507 /* ??? The context of gnu_field is not necessarily gnu_type so
4508 the MULT_EXPR node built above may not be marked by the call
4509 to create_type_decl below. */
4510 if (global_bindings_p ())
4511 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4515 gnu_type = build_qualified_type (gnu_type,
4516 (TYPE_QUALS (gnu_type)
4517 | (TYPE_QUAL_VOLATILE
4518 * Treat_As_Volatile (gnat_entity))));
4520 if (Is_Atomic (gnat_entity))
4521 check_ok_for_atomic (gnu_type, gnat_entity, false);
4523 if (Present (Alignment_Clause (gnat_entity)))
4524 TYPE_USER_ALIGN (gnu_type) = 1;
4526 if (Universal_Aliasing (gnat_entity))
4527 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4530 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4531 !Comes_From_Source (gnat_entity),
4532 debug_info_p, gnat_entity);
4534 TREE_TYPE (gnu_decl) = gnu_type;
4537 if (IN (kind, Type_Kind) && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4539 gnu_type = TREE_TYPE (gnu_decl);
4541 /* If this is a derived type, relate its alias set to that of its parent
4542 to avoid troubles when a call to an inherited primitive is inlined in
4543 a context where a derived object is accessed. The inlined code works
4544 on the parent view so the resulting code may access the same object
4545 using both the parent and the derived alias sets, which thus have to
4546 conflict. As the same issue arises with component references, the
4547 parent alias set also has to conflict with composite types enclosing
4548 derived components. For instance, if we have:
4555 we want T to conflict with both D and R, in addition to R being a
4556 superset of D by record/component construction.
4558 One way to achieve this is to perform an alias set copy from the
4559 parent to the derived type. This is not quite appropriate, though,
4560 as we don't want separate derived types to conflict with each other:
4562 type I1 is new Integer;
4563 type I2 is new Integer;
4565 We want I1 and I2 to both conflict with Integer but we do not want
4566 I1 to conflict with I2, and an alias set copy on derivation would
4569 The option chosen is to make the alias set of the derived type a
4570 superset of that of its parent type. It trivially fulfills the
4571 simple requirement for the Integer derivation example above, and
4572 the component case as well by superset transitivity:
4575 R ----------> D ----------> T
4577 The language rules ensure the parent type is already frozen here. */
4578 if (Is_Derived_Type (gnat_entity))
4580 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4581 relate_alias_sets (gnu_type, gnu_parent_type, ALIAS_SET_SUPERSET);
4584 /* Back-annotate the Alignment of the type if not already in the
4585 tree. Likewise for sizes. */
4586 if (Unknown_Alignment (gnat_entity))
4587 Set_Alignment (gnat_entity,
4588 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4590 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4592 /* If the size is self-referential, we annotate the maximum
4593 value of that size. */
4594 tree gnu_size = TYPE_SIZE (gnu_type);
4596 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4597 gnu_size = max_size (gnu_size, true);
4599 Set_Esize (gnat_entity, annotate_value (gnu_size));
4601 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4603 /* In this mode the tag and the parent components are not
4604 generated by the front-end, so the sizes must be adjusted
4606 int size_offset, new_size;
4608 if (Is_Derived_Type (gnat_entity))
4611 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4612 Set_Alignment (gnat_entity,
4613 Alignment (Etype (Base_Type (gnat_entity))));
4616 size_offset = POINTER_SIZE;
4618 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4619 Set_Esize (gnat_entity,
4620 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4621 / POINTER_SIZE) * POINTER_SIZE));
4622 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4626 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4627 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4630 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4631 DECL_ARTIFICIAL (gnu_decl) = 1;
4633 if (!debug_info_p && DECL_P (gnu_decl)
4634 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4635 && No (Renamed_Object (gnat_entity)))
4636 DECL_IGNORED_P (gnu_decl) = 1;
4638 /* If we haven't already, associate the ..._DECL node that we just made with
4639 the input GNAT entity node. */
4641 save_gnu_tree (gnat_entity, gnu_decl, false);
4643 /* If this is an enumeral or floating-point type, we were not able to set
4644 the bounds since they refer to the type. These bounds are always static.
4646 For enumeration types, also write debugging information and declare the
4647 enumeration literal table, if needed. */
4649 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4650 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4652 tree gnu_scalar_type = gnu_type;
4654 /* If this is a padded type, we need to use the underlying type. */
4655 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4656 && TYPE_IS_PADDING_P (gnu_scalar_type))
4657 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4659 /* If this is a floating point type and we haven't set a floating
4660 point type yet, use this in the evaluation of the bounds. */
4661 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4662 longest_float_type_node = gnu_type;
4664 TYPE_MIN_VALUE (gnu_scalar_type)
4665 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4666 TYPE_MAX_VALUE (gnu_scalar_type)
4667 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4669 if (TREE_CODE (gnu_scalar_type) == ENUMERAL_TYPE)
4671 /* Since this has both a typedef and a tag, avoid outputting
4673 DECL_ARTIFICIAL (gnu_decl) = 1;
4674 rest_of_type_decl_compilation (gnu_decl);
4678 /* If we deferred processing of incomplete types, re-enable it. If there
4679 were no other disables and we have some to process, do so. */
4680 if (this_deferred && --defer_incomplete_level == 0)
4682 if (defer_incomplete_list)
4684 struct incomplete *incp, *next;
4686 /* We are back to level 0 for the deferring of incomplete types.
4687 But processing these incomplete types below may itself require
4688 deferring, so preserve what we have and restart from scratch. */
4689 incp = defer_incomplete_list;
4690 defer_incomplete_list = NULL;
4692 /* For finalization, however, all types must be complete so we
4693 cannot do the same because deferred incomplete types may end up
4694 referencing each other. Process them all recursively first. */
4695 defer_finalize_level++;
4697 for (; incp; incp = next)
4702 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4703 gnat_to_gnu_type (incp->full_type));
4707 defer_finalize_level--;
4710 /* All the deferred incomplete types have been processed so we can
4711 now proceed with the finalization of the deferred types. */
4712 if (defer_finalize_level == 0 && defer_finalize_list)
4717 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4718 rest_of_type_decl_compilation_no_defer (t);
4720 VEC_free (tree, heap, defer_finalize_list);
4724 /* If we are not defining this type, see if it's in the incomplete list.
4725 If so, handle that list entry now. */
4726 else if (!definition)
4728 struct incomplete *incp;
4730 for (incp = defer_incomplete_list; incp; incp = incp->next)
4731 if (incp->old_type && incp->full_type == gnat_entity)
4733 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4734 TREE_TYPE (gnu_decl));
4735 incp->old_type = NULL_TREE;
4742 /* If this is a packed array type whose original array type is itself
4743 an Itype without freeze node, make sure the latter is processed. */
4744 if (Is_Packed_Array_Type (gnat_entity)
4745 && Is_Itype (Original_Array_Type (gnat_entity))
4746 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4747 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4748 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4753 /* Similar, but if the returned value is a COMPONENT_REF, return the
4757 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4759 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4761 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4762 gnu_field = TREE_OPERAND (gnu_field, 1);
4767 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4768 the GCC type corresponding to that entity. */
4771 gnat_to_gnu_type (Entity_Id gnat_entity)
4775 /* The back end never attempts to annotate generic types. */
4776 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4777 return void_type_node;
4779 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4780 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4782 return TREE_TYPE (gnu_decl);
4785 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4786 the unpadded version of the GCC type corresponding to that entity. */
4789 get_unpadded_type (Entity_Id gnat_entity)
4791 tree type = gnat_to_gnu_type (gnat_entity);
4793 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4794 type = TREE_TYPE (TYPE_FIELDS (type));
4799 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4800 Every TYPE_DECL generated for a type definition must be passed
4801 to this function once everything else has been done for it. */
4804 rest_of_type_decl_compilation (tree decl)
4806 /* We need to defer finalizing the type if incomplete types
4807 are being deferred or if they are being processed. */
4808 if (defer_incomplete_level || defer_finalize_level)
4809 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4811 rest_of_type_decl_compilation_no_defer (decl);
4814 /* Same as above but without deferring the compilation. This
4815 function should not be invoked directly on a TYPE_DECL. */
4818 rest_of_type_decl_compilation_no_defer (tree decl)
4820 const int toplev = global_bindings_p ();
4821 tree t = TREE_TYPE (decl);
4823 rest_of_decl_compilation (decl, toplev, 0);
4825 /* Now process all the variants. This is needed for STABS. */
4826 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4828 if (t == TREE_TYPE (decl))
4831 if (!TYPE_STUB_DECL (t))
4832 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4834 rest_of_type_compilation (t, toplev);
4838 /* Finalize any From_With_Type incomplete types. We do this after processing
4839 our compilation unit and after processing its spec, if this is a body. */
4842 finalize_from_with_types (void)
4844 struct incomplete *incp = defer_limited_with;
4845 struct incomplete *next;
4847 defer_limited_with = 0;
4848 for (; incp; incp = next)
4852 if (incp->old_type != 0)
4853 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4854 gnat_to_gnu_type (incp->full_type));
4859 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4860 kind of type (such E_Task_Type) that has a different type which Gigi
4861 uses for its representation. If the type does not have a special type
4862 for its representation, return GNAT_ENTITY. If a type is supposed to
4863 exist, but does not, abort unless annotating types, in which case
4864 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4867 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4869 Entity_Id gnat_equiv = gnat_entity;
4871 if (No (gnat_entity))
4874 switch (Ekind (gnat_entity))
4876 case E_Class_Wide_Subtype:
4877 if (Present (Equivalent_Type (gnat_entity)))
4878 gnat_equiv = Equivalent_Type (gnat_entity);
4881 case E_Access_Protected_Subprogram_Type:
4882 case E_Anonymous_Access_Protected_Subprogram_Type:
4883 gnat_equiv = Equivalent_Type (gnat_entity);
4886 case E_Class_Wide_Type:
4887 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
4888 ? Equivalent_Type (gnat_entity)
4889 : Root_Type (gnat_entity));
4893 case E_Task_Subtype:
4894 case E_Protected_Type:
4895 case E_Protected_Subtype:
4896 gnat_equiv = Corresponding_Record_Type (gnat_entity);
4903 gcc_assert (Present (gnat_equiv) || type_annotate_only);
4907 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
4908 using MECH as its passing mechanism, to be placed in the parameter
4909 list built for GNAT_SUBPROG. Assume a foreign convention for the
4910 latter if FOREIGN is true. Also set CICO to true if the parameter
4911 must use the copy-in copy-out implementation mechanism.
4913 The returned tree is a PARM_DECL, except for those cases where no
4914 parameter needs to be actually passed to the subprogram; the type
4915 of this "shadow" parameter is then returned instead. */
4918 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
4919 Entity_Id gnat_subprog, bool foreign, bool *cico)
4921 tree gnu_param_name = get_entity_name (gnat_param);
4922 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4923 tree gnu_param_type_alt = NULL_TREE;
4924 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
4925 /* The parameter can be indirectly modified if its address is taken. */
4926 bool ro_param = in_param && !Address_Taken (gnat_param);
4927 bool by_return = false, by_component_ptr = false, by_ref = false;
4930 /* Copy-return is used only for the first parameter of a valued procedure.
4931 It's a copy mechanism for which a parameter is never allocated. */
4932 if (mech == By_Copy_Return)
4934 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
4939 /* If this is either a foreign function or if the underlying type won't
4940 be passed by reference, strip off possible padding type. */
4941 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
4942 && TYPE_IS_PADDING_P (gnu_param_type))
4944 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
4946 if (mech == By_Reference
4948 || (!must_pass_by_ref (unpadded_type)
4949 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
4950 gnu_param_type = unpadded_type;
4953 /* If this is a read-only parameter, make a variant of the type that is
4954 read-only. ??? However, if this is an unconstrained array, that type
4955 can be very complex, so skip it for now. Likewise for any other
4956 self-referential type. */
4958 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
4959 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
4960 gnu_param_type = build_qualified_type (gnu_param_type,
4961 (TYPE_QUALS (gnu_param_type)
4962 | TYPE_QUAL_CONST));
4964 /* For foreign conventions, pass arrays as pointers to the element type.
4965 First check for unconstrained array and get the underlying array. */
4966 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
4968 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
4970 /* VMS descriptors are themselves passed by reference. */
4971 if (mech == By_Short_Descriptor ||
4972 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
4974 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
4975 Mechanism (gnat_param),
4977 else if (mech == By_Descriptor)
4979 /* Build both a 32-bit and 64-bit descriptor, one of which will be
4980 chosen in fill_vms_descriptor. */
4982 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
4983 Mechanism (gnat_param),
4986 = build_pointer_type (build_vms_descriptor (gnu_param_type,
4987 Mechanism (gnat_param),
4991 /* Arrays are passed as pointers to element type for foreign conventions. */
4994 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
4996 /* Strip off any multi-dimensional entries, then strip
4997 off the last array to get the component type. */
4998 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
4999 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5000 gnu_param_type = TREE_TYPE (gnu_param_type);
5002 by_component_ptr = true;
5003 gnu_param_type = TREE_TYPE (gnu_param_type);
5006 gnu_param_type = build_qualified_type (gnu_param_type,
5007 (TYPE_QUALS (gnu_param_type)
5008 | TYPE_QUAL_CONST));
5010 gnu_param_type = build_pointer_type (gnu_param_type);
5013 /* Fat pointers are passed as thin pointers for foreign conventions. */
5014 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
5016 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5018 /* If we must pass or were requested to pass by reference, do so.
5019 If we were requested to pass by copy, do so.
5020 Otherwise, for foreign conventions, pass In Out or Out parameters
5021 or aggregates by reference. For COBOL and Fortran, pass all
5022 integer and FP types that way too. For Convention Ada, use
5023 the standard Ada default. */
5024 else if (must_pass_by_ref (gnu_param_type)
5025 || mech == By_Reference
5028 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5030 && (Convention (gnat_subprog) == Convention_Fortran
5031 || Convention (gnat_subprog) == Convention_COBOL)
5032 && (INTEGRAL_TYPE_P (gnu_param_type)
5033 || FLOAT_TYPE_P (gnu_param_type)))
5035 && default_pass_by_ref (gnu_param_type)))))
5037 gnu_param_type = build_reference_type (gnu_param_type);
5041 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5045 if (mech == By_Copy && (by_ref || by_component_ptr))
5046 post_error ("?cannot pass & by copy", gnat_param);
5048 /* If this is an Out parameter that isn't passed by reference and isn't
5049 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5050 it will be a VAR_DECL created when we process the procedure, so just
5051 return its type. For the special parameter of a valued procedure,
5054 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5055 Out parameters with discriminants or implicit initial values to be
5056 handled like In Out parameters. These type are normally built as
5057 aggregates, hence passed by reference, except for some packed arrays
5058 which end up encoded in special integer types.
5060 The exception we need to make is then for packed arrays of records
5061 with discriminants or implicit initial values. We have no light/easy
5062 way to check for the latter case, so we merely check for packed arrays
5063 of records. This may lead to useless copy-in operations, but in very
5064 rare cases only, as these would be exceptions in a set of already
5065 exceptional situations. */
5066 if (Ekind (gnat_param) == E_Out_Parameter
5069 || (mech != By_Descriptor
5070 && mech != By_Short_Descriptor
5071 && !POINTER_TYPE_P (gnu_param_type)
5072 && !AGGREGATE_TYPE_P (gnu_param_type)))
5073 && !(Is_Array_Type (Etype (gnat_param))
5074 && Is_Packed (Etype (gnat_param))
5075 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5076 return gnu_param_type;
5078 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5079 ro_param || by_ref || by_component_ptr);
5080 DECL_BY_REF_P (gnu_param) = by_ref;
5081 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5082 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5083 mech == By_Short_Descriptor);
5084 DECL_POINTS_TO_READONLY_P (gnu_param)
5085 = (ro_param && (by_ref || by_component_ptr));
5087 /* Save the alternate descriptor type, if any. */
5088 if (gnu_param_type_alt)
5089 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5091 /* If no Mechanism was specified, indicate what we're using, then
5092 back-annotate it. */
5093 if (mech == Default)
5094 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5096 Set_Mechanism (gnat_param, mech);
5100 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5103 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5105 while (Present (Corresponding_Discriminant (discr1)))
5106 discr1 = Corresponding_Discriminant (discr1);
5108 while (Present (Corresponding_Discriminant (discr2)))
5109 discr2 = Corresponding_Discriminant (discr2);
5112 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5115 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
5116 a non-aliased component in the back-end sense. */
5119 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
5121 /* If the type below this is a multi-array type, then
5122 this does not have aliased components. */
5123 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5124 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5127 if (Has_Aliased_Components (gnat_type))
5130 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5133 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5136 compile_time_known_address_p (Node_Id gnat_address)
5138 /* Catch System'To_Address. */
5139 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5140 gnat_address = Expression (gnat_address);
5142 return Compile_Time_Known_Value (gnat_address);
5145 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5146 be elaborated at the point of its definition, but do nothing else. */
5149 elaborate_entity (Entity_Id gnat_entity)
5151 switch (Ekind (gnat_entity))
5153 case E_Signed_Integer_Subtype:
5154 case E_Modular_Integer_Subtype:
5155 case E_Enumeration_Subtype:
5156 case E_Ordinary_Fixed_Point_Subtype:
5157 case E_Decimal_Fixed_Point_Subtype:
5158 case E_Floating_Point_Subtype:
5160 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5161 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5163 /* ??? Tests for avoiding static constraint error expression
5164 is needed until the front stops generating bogus conversions
5165 on bounds of real types. */
5167 if (!Raises_Constraint_Error (gnat_lb))
5168 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5169 1, 0, Needs_Debug_Info (gnat_entity));
5170 if (!Raises_Constraint_Error (gnat_hb))
5171 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5172 1, 0, Needs_Debug_Info (gnat_entity));
5178 Node_Id full_definition = Declaration_Node (gnat_entity);
5179 Node_Id record_definition = Type_Definition (full_definition);
5181 /* If this is a record extension, go a level further to find the
5182 record definition. */
5183 if (Nkind (record_definition) == N_Derived_Type_Definition)
5184 record_definition = Record_Extension_Part (record_definition);
5188 case E_Record_Subtype:
5189 case E_Private_Subtype:
5190 case E_Limited_Private_Subtype:
5191 case E_Record_Subtype_With_Private:
5192 if (Is_Constrained (gnat_entity)
5193 && Has_Discriminants (Base_Type (gnat_entity))
5194 && Present (Discriminant_Constraint (gnat_entity)))
5196 Node_Id gnat_discriminant_expr;
5197 Entity_Id gnat_field;
5199 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
5200 gnat_discriminant_expr
5201 = First_Elmt (Discriminant_Constraint (gnat_entity));
5202 Present (gnat_field);
5203 gnat_field = Next_Discriminant (gnat_field),
5204 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5205 /* ??? For now, ignore access discriminants. */
5206 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5207 elaborate_expression (Node (gnat_discriminant_expr),
5209 get_entity_name (gnat_field), 1, 0, 0);
5216 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5217 any entities on its entity chain similarly. */
5220 mark_out_of_scope (Entity_Id gnat_entity)
5222 Entity_Id gnat_sub_entity;
5223 unsigned int kind = Ekind (gnat_entity);
5225 /* If this has an entity list, process all in the list. */
5226 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5227 || IN (kind, Private_Kind)
5228 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5229 || kind == E_Function || kind == E_Generic_Function
5230 || kind == E_Generic_Package || kind == E_Generic_Procedure
5231 || kind == E_Loop || kind == E_Operator || kind == E_Package
5232 || kind == E_Package_Body || kind == E_Procedure
5233 || kind == E_Record_Type || kind == E_Record_Subtype
5234 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5235 for (gnat_sub_entity = First_Entity (gnat_entity);
5236 Present (gnat_sub_entity);
5237 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5238 if (Scope (gnat_sub_entity) == gnat_entity
5239 && gnat_sub_entity != gnat_entity)
5240 mark_out_of_scope (gnat_sub_entity);
5242 /* Now clear this if it has been defined, but only do so if it isn't
5243 a subprogram or parameter. We could refine this, but it isn't
5244 worth it. If this is statically allocated, it is supposed to
5245 hang around out of cope. */
5246 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5247 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5249 save_gnu_tree (gnat_entity, NULL_TREE, true);
5250 save_gnu_tree (gnat_entity, error_mark_node, true);
5254 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5255 If this is a multi-dimensional array type, do this recursively.
5258 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5259 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5260 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5263 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5265 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5266 of a one-dimensional array, since the padding has the same alias set
5267 as the field type, but if it's a multi-dimensional array, we need to
5268 see the inner types. */
5269 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5270 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5271 || TYPE_IS_PADDING_P (gnu_old_type)))
5272 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5274 /* Unconstrained array types are deemed incomplete and would thus be given
5275 alias set 0. Retrieve the underlying array type. */
5276 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5278 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5279 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5281 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5283 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5284 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5285 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5286 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5290 case ALIAS_SET_COPY:
5291 /* The alias set shouldn't be copied between array types with different
5292 aliasing settings because this can break the aliasing relationship
5293 between the array type and its element type. */
5294 #ifndef ENABLE_CHECKING
5295 if (flag_strict_aliasing)
5297 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5298 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5299 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5300 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5302 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5305 case ALIAS_SET_SUBSET:
5306 case ALIAS_SET_SUPERSET:
5308 alias_set_type old_set = get_alias_set (gnu_old_type);
5309 alias_set_type new_set = get_alias_set (gnu_new_type);
5311 /* Do nothing if the alias sets conflict. This ensures that we
5312 never call record_alias_subset several times for the same pair
5313 or at all for alias set 0. */
5314 if (!alias_sets_conflict_p (old_set, new_set))
5316 if (op == ALIAS_SET_SUBSET)
5317 record_alias_subset (old_set, new_set);
5319 record_alias_subset (new_set, old_set);
5328 record_component_aliases (gnu_new_type);
5331 /* Return a TREE_LIST describing the substitutions needed to reflect
5332 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
5333 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
5334 of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE
5335 gives the tree for the discriminant and TREE_VALUES is the replacement
5336 value. They are in the form of operands to substitute_in_expr.
5337 DEFINITION is as in gnat_to_gnu_entity. */
5340 substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type,
5341 tree gnu_list, bool definition)
5343 Entity_Id gnat_discrim;
5347 gnat_type = Implementation_Base_Type (gnat_subtype);
5349 if (Has_Discriminants (gnat_type))
5350 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5351 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5352 Present (gnat_discrim);
5353 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5354 gnat_value = Next_Elmt (gnat_value))
5355 /* Ignore access discriminants. */
5356 if (!Is_Access_Type (Etype (Node (gnat_value))))
5357 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5358 elaborate_expression
5359 (Node (gnat_value), gnat_subtype,
5360 get_entity_name (gnat_discrim), definition,
5367 /* Return true if the size represented by GNU_SIZE can be handled by an
5368 allocation. If STATIC_P is true, consider only what can be done with a
5369 static allocation. */
5372 allocatable_size_p (tree gnu_size, bool static_p)
5374 HOST_WIDE_INT our_size;
5376 /* If this is not a static allocation, the only case we want to forbid
5377 is an overflowing size. That will be converted into a raise a
5380 return !(TREE_CODE (gnu_size) == INTEGER_CST
5381 && TREE_OVERFLOW (gnu_size));
5383 /* Otherwise, we need to deal with both variable sizes and constant
5384 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5385 since assemblers may not like very large sizes. */
5386 if (!host_integerp (gnu_size, 1))
5389 our_size = tree_low_cst (gnu_size, 1);
5390 return (int) our_size == our_size;
5393 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5394 NAME, ARGS and ERROR_POINT. */
5397 prepend_one_attribute_to (struct attrib ** attr_list,
5398 enum attr_type attr_type,
5401 Node_Id attr_error_point)
5403 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5405 attr->type = attr_type;
5406 attr->name = attr_name;
5407 attr->args = attr_args;
5408 attr->error_point = attr_error_point;
5410 attr->next = *attr_list;
5414 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5417 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5421 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5422 gnat_temp = Next_Rep_Item (gnat_temp))
5423 if (Nkind (gnat_temp) == N_Pragma)
5425 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5426 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5427 enum attr_type etype;
5429 if (Present (gnat_assoc) && Present (First (gnat_assoc))
5430 && Present (Next (First (gnat_assoc)))
5431 && (Nkind (Expression (Next (First (gnat_assoc))))
5432 == N_String_Literal))
5434 gnu_arg0 = get_identifier (TREE_STRING_POINTER
5437 (First (gnat_assoc))))));
5438 if (Present (Next (Next (First (gnat_assoc))))
5439 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
5440 == N_String_Literal))
5441 gnu_arg1 = get_identifier (TREE_STRING_POINTER
5445 (First (gnat_assoc)))))));
5448 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5450 case Pragma_Machine_Attribute:
5451 etype = ATTR_MACHINE_ATTRIBUTE;
5454 case Pragma_Linker_Alias:
5455 etype = ATTR_LINK_ALIAS;
5458 case Pragma_Linker_Section:
5459 etype = ATTR_LINK_SECTION;
5462 case Pragma_Linker_Constructor:
5463 etype = ATTR_LINK_CONSTRUCTOR;
5466 case Pragma_Linker_Destructor:
5467 etype = ATTR_LINK_DESTRUCTOR;
5470 case Pragma_Weak_External:
5471 etype = ATTR_WEAK_EXTERNAL;
5474 case Pragma_Thread_Local_Storage:
5475 etype = ATTR_THREAD_LOCAL_STORAGE;
5483 /* Prepend to the list now. Make a list of the argument we might
5484 have, as GCC expects it. */
5485 prepend_one_attribute_to
5488 (gnu_arg1 != NULL_TREE)
5489 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5490 Present (Next (First (gnat_assoc)))
5491 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5495 /* Called when we need to protect a variable object using a save_expr. */
5498 maybe_variable (tree gnu_operand)
5500 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
5501 || TREE_CODE (gnu_operand) == SAVE_EXPR
5502 || TREE_CODE (gnu_operand) == NULL_EXPR)
5505 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5507 tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF,
5508 TREE_TYPE (gnu_operand),
5509 variable_size (TREE_OPERAND (gnu_operand, 0)));
5511 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5512 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5516 return variable_size (gnu_operand);
5519 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5520 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5521 return the GCC tree to use for that expression. GNU_NAME is the
5522 qualification to use if an external name is appropriate and DEFINITION is
5523 true if this is a definition of GNAT_ENTITY. If NEED_VALUE is true, we
5524 need a result. Otherwise, we are just elaborating this for side-effects.
5525 If NEED_DEBUG is true we need the symbol for debugging purposes even if it
5526 isn't needed for code generation. */
5529 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity,
5530 tree gnu_name, bool definition, bool need_value,
5535 /* If we already elaborated this expression (e.g., it was involved
5536 in the definition of a private type), use the old value. */
5537 if (present_gnu_tree (gnat_expr))
5538 return get_gnu_tree (gnat_expr);
5540 /* If we don't need a value and this is static or a discriminant, we
5541 don't need to do anything. */
5542 else if (!need_value
5543 && (Is_OK_Static_Expression (gnat_expr)
5544 || (Nkind (gnat_expr) == N_Identifier
5545 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5548 /* Otherwise, convert this tree to its GCC equivalent. */
5550 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
5551 gnu_name, definition, need_debug);
5553 /* Save the expression in case we try to elaborate this entity again. Since
5554 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5555 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5556 save_gnu_tree (gnat_expr, gnu_expr, true);
5558 return need_value ? gnu_expr : error_mark_node;
5561 /* Similar, but take a GNU expression. */
5564 elaborate_expression_1 (Node_Id gnat_expr, Entity_Id gnat_entity,
5565 tree gnu_expr, tree gnu_name, bool definition,
5568 tree gnu_decl = NULL_TREE;
5569 /* Skip any conversions and simple arithmetics to see if the expression
5570 is a read-only variable.
5571 ??? This really should remain read-only, but we have to think about
5572 the typing of the tree here. */
5574 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5575 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5578 /* In most cases, we won't see a naked FIELD_DECL here because a
5579 discriminant reference will have been replaced with a COMPONENT_REF
5580 when the type is being elaborated. However, there are some cases
5581 involving child types where we will. So convert it to a COMPONENT_REF
5582 here. We have to hope it will be at the highest level of the
5583 expression in these cases. */
5584 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5585 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5586 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5587 gnu_expr, NULL_TREE);
5589 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5590 that is read-only, make a variable that is initialized to contain the
5591 bound when the package containing the definition is elaborated. If
5592 this entity is defined at top level and a bound or discriminant value
5593 isn't a constant or a reference to a discriminant, replace the bound
5594 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5595 rely here on the fact that an expression cannot contain both the
5596 discriminant and some other variable. */
5598 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5599 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5600 && (TREE_READONLY (gnu_inner_expr)
5601 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5602 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5604 /* If this is a static expression or contains a discriminant, we don't
5605 need the variable for debugging (and can't elaborate anyway if a
5608 && (Is_OK_Static_Expression (gnat_expr)
5609 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
5612 /* Now create the variable if we need it. */
5613 if (need_debug || (expr_variable && expr_global))
5615 = create_var_decl (create_concat_name (gnat_entity,
5616 IDENTIFIER_POINTER (gnu_name)),
5617 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5618 !need_debug, Is_Public (gnat_entity),
5619 !definition, false, NULL, gnat_entity);
5621 /* We only need to use this variable if we are in global context since GCC
5622 can do the right thing in the local case. */
5623 if (expr_global && expr_variable)
5625 else if (!expr_variable)
5628 return maybe_variable (gnu_expr);
5631 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5632 starting bit position so that it is aligned to ALIGN bits, and leaving at
5633 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5634 record is guaranteed to get. */
5637 make_aligning_type (tree type, unsigned int align, tree size,
5638 unsigned int base_align, int room)
5640 /* We will be crafting a record type with one field at a position set to be
5641 the next multiple of ALIGN past record'address + room bytes. We use a
5642 record placeholder to express record'address. */
5644 tree record_type = make_node (RECORD_TYPE);
5645 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5648 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5650 /* The diagram below summarizes the shape of what we manipulate:
5652 <--------- pos ---------->
5653 { +------------+-------------+-----------------+
5654 record =>{ |############| ... | field (type) |
5655 { +------------+-------------+-----------------+
5656 |<-- room -->|<- voffset ->|<---- size ----->|
5659 record_addr vblock_addr
5661 Every length is in sizetype bytes there, except "pos" which has to be
5662 set as a bit position in the GCC tree for the record. */
5664 tree room_st = size_int (room);
5665 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5666 tree voffset_st, pos, field;
5668 tree name = TYPE_NAME (type);
5670 if (TREE_CODE (name) == TYPE_DECL)
5671 name = DECL_NAME (name);
5673 TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN");
5675 /* Compute VOFFSET and then POS. The next byte position multiple of some
5676 alignment after some address is obtained by "and"ing the alignment minus
5677 1 with the two's complement of the address. */
5679 voffset_st = size_binop (BIT_AND_EXPR,
5680 size_diffop (size_zero_node, vblock_addr_st),
5681 ssize_int ((align / BITS_PER_UNIT) - 1));
5683 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5685 pos = size_binop (MULT_EXPR,
5686 convert (bitsizetype,
5687 size_binop (PLUS_EXPR, room_st, voffset_st)),
5690 /* Craft the GCC record representation. We exceptionally do everything
5691 manually here because 1) our generic circuitry is not quite ready to
5692 handle the complex position/size expressions we are setting up, 2) we
5693 have a strong simplifying factor at hand: we know the maximum possible
5694 value of voffset, and 3) we have to set/reset at least the sizes in
5695 accordance with this maximum value anyway, as we need them to convey
5696 what should be "alloc"ated for this type.
5698 Use -1 as the 'addressable' indication for the field to prevent the
5699 creation of a bitfield. We don't need one, it would have damaging
5700 consequences on the alignment computation, and create_field_decl would
5701 make one without this special argument, for instance because of the
5702 complex position expression. */
5704 field = create_field_decl (get_identifier ("F"), type, record_type,
5706 TYPE_FIELDS (record_type) = field;
5708 TYPE_ALIGN (record_type) = base_align;
5709 TYPE_USER_ALIGN (record_type) = 1;
5711 TYPE_SIZE (record_type)
5712 = size_binop (PLUS_EXPR,
5713 size_binop (MULT_EXPR, convert (bitsizetype, size),
5715 bitsize_int (align + room * BITS_PER_UNIT));
5716 TYPE_SIZE_UNIT (record_type)
5717 = size_binop (PLUS_EXPR, size,
5718 size_int (room + align / BITS_PER_UNIT));
5720 SET_TYPE_MODE (record_type, BLKmode);
5722 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5726 /* Return the result of rounding T up to ALIGN. */
5728 static inline unsigned HOST_WIDE_INT
5729 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5737 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5738 as the field type of a packed record if IN_RECORD is true, or as the
5739 component type of a packed array if IN_RECORD is false. See if we can
5740 rewrite it either as a type that has a non-BLKmode, which we can pack
5741 tighter in the packed record case, or as a smaller type. If so, return
5742 the new type. If not, return the original type. */
5745 make_packable_type (tree type, bool in_record)
5747 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5748 unsigned HOST_WIDE_INT new_size;
5749 tree new_type, old_field, field_list = NULL_TREE;
5751 /* No point in doing anything if the size is zero. */
5755 new_type = make_node (TREE_CODE (type));
5757 /* Copy the name and flags from the old type to that of the new.
5758 Note that we rely on the pointer equality created here for
5759 TYPE_NAME to look through conversions in various places. */
5760 TYPE_NAME (new_type) = TYPE_NAME (type);
5761 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5762 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5763 if (TREE_CODE (type) == RECORD_TYPE)
5764 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5766 /* If we are in a record and have a small size, set the alignment to
5767 try for an integral mode. Otherwise set it to try for a smaller
5768 type with BLKmode. */
5769 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5771 TYPE_ALIGN (new_type) = ceil_alignment (size);
5772 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5776 unsigned HOST_WIDE_INT align;
5778 /* Do not try to shrink the size if the RM size is not constant. */
5779 if (TYPE_CONTAINS_TEMPLATE_P (type)
5780 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5783 /* Round the RM size up to a unit boundary to get the minimal size
5784 for a BLKmode record. Give up if it's already the size. */
5785 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5786 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5787 if (new_size == size)
5790 align = new_size & -new_size;
5791 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5794 TYPE_USER_ALIGN (new_type) = 1;
5796 /* Now copy the fields, keeping the position and size as we don't want
5797 to change the layout by propagating the packedness downwards. */
5798 for (old_field = TYPE_FIELDS (type); old_field;
5799 old_field = TREE_CHAIN (old_field))
5801 tree new_field_type = TREE_TYPE (old_field);
5802 tree new_field, new_size;
5804 if ((TREE_CODE (new_field_type) == RECORD_TYPE
5805 || TREE_CODE (new_field_type) == UNION_TYPE
5806 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5807 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5808 && host_integerp (TYPE_SIZE (new_field_type), 1))
5809 new_field_type = make_packable_type (new_field_type, true);
5811 /* However, for the last field in a not already packed record type
5812 that is of an aggregate type, we need to use the RM size in the
5813 packable version of the record type, see finish_record_type. */
5814 if (!TREE_CHAIN (old_field)
5815 && !TYPE_PACKED (type)
5816 && (TREE_CODE (new_field_type) == RECORD_TYPE
5817 || TREE_CODE (new_field_type) == UNION_TYPE
5818 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5819 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5820 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5821 && TYPE_ADA_SIZE (new_field_type))
5822 new_size = TYPE_ADA_SIZE (new_field_type);
5824 new_size = DECL_SIZE (old_field);
5826 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5827 new_type, TYPE_PACKED (type), new_size,
5828 bit_position (old_field),
5829 !DECL_NONADDRESSABLE_P (old_field));
5831 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
5832 SET_DECL_ORIGINAL_FIELD
5833 (new_field, (DECL_ORIGINAL_FIELD (old_field)
5834 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
5836 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
5837 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
5839 TREE_CHAIN (new_field) = field_list;
5840 field_list = new_field;
5843 finish_record_type (new_type, nreverse (field_list), 2, true);
5844 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
5846 /* If this is a padding record, we never want to make the size smaller
5847 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
5848 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5849 || TREE_CODE (type) == QUAL_UNION_TYPE)
5851 TYPE_SIZE (new_type) = TYPE_SIZE (type);
5852 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
5856 TYPE_SIZE (new_type) = bitsize_int (new_size);
5857 TYPE_SIZE_UNIT (new_type)
5858 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
5861 if (!TYPE_CONTAINS_TEMPLATE_P (type))
5862 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
5864 compute_record_mode (new_type);
5866 /* Try harder to get a packable type if necessary, for example
5867 in case the record itself contains a BLKmode field. */
5868 if (in_record && TYPE_MODE (new_type) == BLKmode)
5869 SET_TYPE_MODE (new_type,
5870 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
5872 /* If neither the mode nor the size has shrunk, return the old type. */
5873 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
5879 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
5880 if needed. We have already verified that SIZE and TYPE are large enough.
5882 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
5885 IS_USER_TYPE is true if we must complete the original type.
5887 DEFINITION is true if this type is being defined.
5889 SAME_RM_SIZE is true if the RM size of the resulting type is to be set
5890 to SIZE too; otherwise, it's set to the RM size of the original type. */
5893 maybe_pad_type (tree type, tree size, unsigned int align,
5894 Entity_Id gnat_entity, const char *name_trailer,
5895 bool is_user_type, bool definition, bool same_rm_size)
5897 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
5898 tree orig_size = TYPE_SIZE (type);
5899 unsigned int orig_align = align;
5902 /* If TYPE is a padded type, see if it agrees with any size and alignment
5903 we were given. If so, return the original type. Otherwise, strip
5904 off the padding, since we will either be returning the inner type
5905 or repadding it. If no size or alignment is specified, use that of
5906 the original padded type. */
5907 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5910 || operand_equal_p (round_up (size,
5911 MAX (align, TYPE_ALIGN (type))),
5912 round_up (TYPE_SIZE (type),
5913 MAX (align, TYPE_ALIGN (type))),
5915 && (align == 0 || align == TYPE_ALIGN (type)))
5919 size = TYPE_SIZE (type);
5921 align = TYPE_ALIGN (type);
5923 type = TREE_TYPE (TYPE_FIELDS (type));
5924 orig_size = TYPE_SIZE (type);
5927 /* If the size is either not being changed or is being made smaller (which
5928 is not done here (and is only valid for bitfields anyway), show the size
5929 isn't changing. Likewise, clear the alignment if it isn't being
5930 changed. Then return if we aren't doing anything. */
5932 && (operand_equal_p (size, orig_size, 0)
5933 || (TREE_CODE (orig_size) == INTEGER_CST
5934 && tree_int_cst_lt (size, orig_size))))
5937 if (align == TYPE_ALIGN (type))
5940 if (align == 0 && !size)
5943 /* If requested, complete the original type and give it a name. */
5945 create_type_decl (get_entity_name (gnat_entity), type,
5946 NULL, !Comes_From_Source (gnat_entity),
5948 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
5949 && DECL_IGNORED_P (TYPE_NAME (type))),
5952 /* We used to modify the record in place in some cases, but that could
5953 generate incorrect debugging information. So make a new record
5955 record = make_node (RECORD_TYPE);
5956 TYPE_IS_PADDING_P (record) = 1;
5958 if (Present (gnat_entity))
5959 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
5961 TYPE_VOLATILE (record)
5962 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
5964 TYPE_ALIGN (record) = align;
5966 TYPE_USER_ALIGN (record) = align;
5968 TYPE_SIZE (record) = size ? size : orig_size;
5969 TYPE_SIZE_UNIT (record)
5970 = convert (sizetype,
5971 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
5972 bitsize_unit_node));
5974 /* If we are changing the alignment and the input type is a record with
5975 BLKmode and a small constant size, try to make a form that has an
5976 integral mode. This might allow the padding record to also have an
5977 integral mode, which will be much more efficient. There is no point
5978 in doing so if a size is specified unless it is also a small constant
5979 size and it is incorrect to do so if we cannot guarantee that the mode
5980 will be naturally aligned since the field must always be addressable.
5982 ??? This might not always be a win when done for a stand-alone object:
5983 since the nominal and the effective type of the object will now have
5984 different modes, a VIEW_CONVERT_EXPR will be required for converting
5985 between them and it might be hard to overcome afterwards, including
5986 at the RTL level when the stand-alone object is accessed as a whole. */
5988 && TREE_CODE (type) == RECORD_TYPE
5989 && TYPE_MODE (type) == BLKmode
5990 && TREE_CODE (orig_size) == INTEGER_CST
5991 && !TREE_OVERFLOW (orig_size)
5992 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
5994 || (TREE_CODE (size) == INTEGER_CST
5995 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
5997 tree packable_type = make_packable_type (type, true);
5998 if (TYPE_MODE (packable_type) != BLKmode
5999 && align >= TYPE_ALIGN (packable_type))
6000 type = packable_type;
6003 /* Now create the field with the original size. */
6004 field = create_field_decl (get_identifier ("F"), type, record, 0,
6005 orig_size, bitsize_zero_node, 1);
6006 DECL_INTERNAL_P (field) = 1;
6008 /* Do not finalize it until after the auxiliary record is built. */
6009 finish_record_type (record, field, 1, true);
6011 /* Set the same size for its RM size if requested; otherwise reuse
6012 the RM size of the original type. */
6013 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6015 /* Unless debugging information isn't being written for the input type,
6016 write a record that shows what we are a subtype of and also make a
6017 variable that indicates our size, if still variable. */
6018 if (TYPE_NAME (record)
6019 && AGGREGATE_TYPE_P (type)
6020 && TREE_CODE (orig_size) != INTEGER_CST
6021 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6022 && DECL_IGNORED_P (TYPE_NAME (type))))
6024 tree marker = make_node (RECORD_TYPE);
6025 tree name = TYPE_NAME (record);
6026 tree orig_name = TYPE_NAME (type);
6028 if (TREE_CODE (name) == TYPE_DECL)
6029 name = DECL_NAME (name);
6031 if (TREE_CODE (orig_name) == TYPE_DECL)
6032 orig_name = DECL_NAME (orig_name);
6034 TYPE_NAME (marker) = concat_id_with_name (name, "XVS");
6035 finish_record_type (marker,
6036 create_field_decl (orig_name, integer_type_node,
6037 marker, 0, NULL_TREE, NULL_TREE,
6041 add_parallel_type (TYPE_STUB_DECL (record), marker);
6043 if (size && TREE_CODE (size) != INTEGER_CST && definition)
6044 create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE,
6045 sizetype, TYPE_SIZE_UNIT (record), false, false,
6046 false, false, NULL, gnat_entity);
6049 rest_of_record_type_compilation (record);
6051 /* If the size was widened explicitly, maybe give a warning. Take the
6052 original size as the maximum size of the input if there was an
6053 unconstrained record involved and round it up to the specified alignment,
6054 if one was specified. */
6055 if (CONTAINS_PLACEHOLDER_P (orig_size))
6056 orig_size = max_size (orig_size, true);
6059 orig_size = round_up (orig_size, align);
6061 if (size && Present (gnat_entity)
6062 && !operand_equal_p (size, orig_size, 0)
6063 && !(TREE_CODE (size) == INTEGER_CST
6064 && TREE_CODE (orig_size) == INTEGER_CST
6065 && tree_int_cst_lt (size, orig_size)))
6067 Node_Id gnat_error_node = Empty;
6069 if (Is_Packed_Array_Type (gnat_entity))
6070 gnat_entity = Original_Array_Type (gnat_entity);
6072 if ((Ekind (gnat_entity) == E_Component
6073 || Ekind (gnat_entity) == E_Discriminant)
6074 && Present (Component_Clause (gnat_entity)))
6075 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6076 else if (Present (Size_Clause (gnat_entity)))
6077 gnat_error_node = Expression (Size_Clause (gnat_entity));
6079 /* Generate message only for entities that come from source, since
6080 if we have an entity created by expansion, the message will be
6081 generated for some other corresponding source entity. */
6082 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
6083 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
6085 size_diffop (size, orig_size));
6087 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
6088 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6089 gnat_entity, gnat_entity,
6090 size_diffop (size, orig_size));
6096 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6097 the value passed against the list of choices. */
6100 choices_to_gnu (tree operand, Node_Id choices)
6104 tree result = integer_zero_node;
6105 tree this_test, low = 0, high = 0, single = 0;
6107 for (choice = First (choices); Present (choice); choice = Next (choice))
6109 switch (Nkind (choice))
6112 low = gnat_to_gnu (Low_Bound (choice));
6113 high = gnat_to_gnu (High_Bound (choice));
6115 /* There's no good type to use here, so we might as well use
6116 integer_type_node. */
6118 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6119 build_binary_op (GE_EXPR, integer_type_node,
6121 build_binary_op (LE_EXPR, integer_type_node,
6126 case N_Subtype_Indication:
6127 gnat_temp = Range_Expression (Constraint (choice));
6128 low = gnat_to_gnu (Low_Bound (gnat_temp));
6129 high = gnat_to_gnu (High_Bound (gnat_temp));
6132 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6133 build_binary_op (GE_EXPR, integer_type_node,
6135 build_binary_op (LE_EXPR, integer_type_node,
6140 case N_Expanded_Name:
6141 /* This represents either a subtype range, an enumeration
6142 literal, or a constant Ekind says which. If an enumeration
6143 literal or constant, fall through to the next case. */
6144 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6145 && Ekind (Entity (choice)) != E_Constant)
6147 tree type = gnat_to_gnu_type (Entity (choice));
6149 low = TYPE_MIN_VALUE (type);
6150 high = TYPE_MAX_VALUE (type);
6153 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6154 build_binary_op (GE_EXPR, integer_type_node,
6156 build_binary_op (LE_EXPR, integer_type_node,
6161 /* ... fall through ... */
6163 case N_Character_Literal:
6164 case N_Integer_Literal:
6165 single = gnat_to_gnu (choice);
6166 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6170 case N_Others_Choice:
6171 this_test = integer_one_node;
6178 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6185 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6186 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6189 adjust_packed (tree field_type, tree record_type, int packed)
6191 /* If the field contains an item of variable size, we cannot pack it
6192 because we cannot create temporaries of non-fixed size in case
6193 we need to take the address of the field. See addressable_p and
6194 the notes on the addressability issues for further details. */
6195 if (is_variable_size (field_type))
6198 /* If the alignment of the record is specified and the field type
6199 is over-aligned, request Storage_Unit alignment for the field. */
6202 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6211 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6212 placed in GNU_RECORD_TYPE.
6214 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6215 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6216 record has a specified alignment.
6218 DEFINITION is true if this field is for a record being defined. */
6221 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6224 tree gnu_field_id = get_entity_name (gnat_field);
6225 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6226 tree gnu_field, gnu_size, gnu_pos;
6227 bool needs_strict_alignment
6228 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6229 || Treat_As_Volatile (gnat_field));
6231 /* If this field requires strict alignment, we cannot pack it because
6232 it would very likely be under-aligned in the record. */
6233 if (needs_strict_alignment)
6236 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6238 /* If a size is specified, use it. Otherwise, if the record type is packed,
6239 use the official RM size. See "Handling of Type'Size Values" in Einfo
6240 for further details. */
6241 if (Known_Static_Esize (gnat_field))
6242 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6243 gnat_field, FIELD_DECL, false, true);
6244 else if (packed == 1)
6245 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6246 gnat_field, FIELD_DECL, false, true);
6248 gnu_size = NULL_TREE;
6250 /* If we have a specified size that's smaller than that of the field type,
6251 or a position is specified, and the field type is a record, see if we can
6252 get either an integral mode form of the type or a smaller form. If we
6253 can, show a size was specified for the field if there wasn't one already,
6254 so we know to make this a bitfield and avoid making things wider.
6256 Doing this is first useful if the record is packed because we may then
6257 place the field at a non-byte-aligned position and so achieve tighter
6260 This is in addition *required* if the field shares a byte with another
6261 field and the front-end lets the back-end handle the references, because
6262 GCC does not handle BLKmode bitfields properly.
6264 We avoid the transformation if it is not required or potentially useful,
6265 as it might entail an increase of the field's alignment and have ripple
6266 effects on the outer record type. A typical case is a field known to be
6267 byte aligned and not to share a byte with another field.
6269 Besides, we don't even look the possibility of a transformation in cases
6270 known to be in error already, for instance when an invalid size results
6271 from a component clause. */
6273 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6274 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
6275 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6278 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6279 || Present (Component_Clause (gnat_field))))))
6281 /* See what the alternate type and size would be. */
6282 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6284 bool has_byte_aligned_clause
6285 = Present (Component_Clause (gnat_field))
6286 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6287 % BITS_PER_UNIT == 0);
6289 /* Compute whether we should avoid the substitution. */
6291 /* There is no point substituting if there is no change... */
6292 = (gnu_packable_type == gnu_field_type)
6293 /* ... nor when the field is known to be byte aligned and not to
6294 share a byte with another field. */
6295 || (has_byte_aligned_clause
6296 && value_factor_p (gnu_size, BITS_PER_UNIT))
6297 /* The size of an aliased field must be an exact multiple of the
6298 type's alignment, which the substitution might increase. Reject
6299 substitutions that would so invalidate a component clause when the
6300 specified position is byte aligned, as the change would have no
6301 real benefit from the packing standpoint anyway. */
6302 || (Is_Aliased (gnat_field)
6303 && has_byte_aligned_clause
6304 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6306 /* Substitute unless told otherwise. */
6309 gnu_field_type = gnu_packable_type;
6312 gnu_size = rm_size (gnu_field_type);
6316 /* If we are packing the record and the field is BLKmode, round the
6317 size up to a byte boundary. */
6318 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6319 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6321 if (Present (Component_Clause (gnat_field)))
6323 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6324 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6325 gnat_field, FIELD_DECL, false, true);
6327 /* Ensure the position does not overlap with the parent subtype,
6329 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6332 = gnat_to_gnu_type (Parent_Subtype
6333 (Underlying_Type (Scope (gnat_field))));
6335 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6336 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6339 ("offset of& must be beyond parent{, minimum allowed is ^}",
6340 First_Bit (Component_Clause (gnat_field)), gnat_field,
6341 TYPE_SIZE_UNIT (gnu_parent));
6345 /* If this field needs strict alignment, ensure the record is
6346 sufficiently aligned and that that position and size are
6347 consistent with the alignment. */
6348 if (needs_strict_alignment)
6350 TYPE_ALIGN (gnu_record_type)
6351 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6354 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6356 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6358 ("atomic field& must be natural size of type{ (^)}",
6359 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6360 TYPE_SIZE (gnu_field_type));
6362 else if (Is_Aliased (gnat_field))
6364 ("size of aliased field& must be ^ bits",
6365 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6366 TYPE_SIZE (gnu_field_type));
6368 else if (Strict_Alignment (Etype (gnat_field)))
6370 ("size of & with aliased or tagged components not ^ bits",
6371 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6372 TYPE_SIZE (gnu_field_type));
6374 gnu_size = NULL_TREE;
6377 if (!integer_zerop (size_binop
6378 (TRUNC_MOD_EXPR, gnu_pos,
6379 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6381 if (Is_Aliased (gnat_field))
6383 ("position of aliased field& must be multiple of ^ bits",
6384 First_Bit (Component_Clause (gnat_field)), gnat_field,
6385 TYPE_ALIGN (gnu_field_type));
6387 else if (Treat_As_Volatile (gnat_field))
6389 ("position of volatile field& must be multiple of ^ bits",
6390 First_Bit (Component_Clause (gnat_field)), gnat_field,
6391 TYPE_ALIGN (gnu_field_type));
6393 else if (Strict_Alignment (Etype (gnat_field)))
6395 ("position of & with aliased or tagged components not multiple of ^ bits",
6396 First_Bit (Component_Clause (gnat_field)), gnat_field,
6397 TYPE_ALIGN (gnu_field_type));
6402 gnu_pos = NULL_TREE;
6406 if (Is_Atomic (gnat_field))
6407 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6410 /* If the record has rep clauses and this is the tag field, make a rep
6411 clause for it as well. */
6412 else if (Has_Specified_Layout (Scope (gnat_field))
6413 && Chars (gnat_field) == Name_uTag)
6415 gnu_pos = bitsize_zero_node;
6416 gnu_size = TYPE_SIZE (gnu_field_type);
6420 gnu_pos = NULL_TREE;
6422 /* We need to make the size the maximum for the type if it is
6423 self-referential and an unconstrained type. In that case, we can't
6424 pack the field since we can't make a copy to align it. */
6425 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6427 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6428 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6430 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6434 /* If a size is specified, adjust the field's type to it. */
6437 /* If the field's type is justified modular, we would need to remove
6438 the wrapper to (better) meet the layout requirements. However we
6439 can do so only if the field is not aliased to preserve the unique
6440 layout and if the prescribed size is not greater than that of the
6441 packed array to preserve the justification. */
6442 if (!needs_strict_alignment
6443 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6444 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6445 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6447 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6450 = make_type_from_size (gnu_field_type, gnu_size,
6451 Has_Biased_Representation (gnat_field));
6452 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6453 "PAD", false, definition, true);
6456 /* Otherwise (or if there was an error), don't specify a position. */
6458 gnu_pos = NULL_TREE;
6460 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6461 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6463 /* Now create the decl for the field. */
6464 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6465 packed, gnu_size, gnu_pos,
6466 Is_Aliased (gnat_field));
6467 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6468 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6470 if (Ekind (gnat_field) == E_Discriminant)
6471 DECL_DISCRIMINANT_NUMBER (gnu_field)
6472 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6477 /* Return true if TYPE is a type with variable size, a padding type with a
6478 field of variable size or is a record that has a field such a field. */
6481 is_variable_size (tree type)
6485 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6488 if (TREE_CODE (type) == RECORD_TYPE
6489 && TYPE_IS_PADDING_P (type)
6490 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6493 if (TREE_CODE (type) != RECORD_TYPE
6494 && TREE_CODE (type) != UNION_TYPE
6495 && TREE_CODE (type) != QUAL_UNION_TYPE)
6498 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6499 if (is_variable_size (TREE_TYPE (field)))
6505 /* qsort comparer for the bit positions of two record components. */
6508 compare_field_bitpos (const PTR rt1, const PTR rt2)
6510 const_tree const field1 = * (const_tree const *) rt1;
6511 const_tree const field2 = * (const_tree const *) rt2;
6513 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6515 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6518 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
6519 of GCC trees for fields that are in the record and have already been
6520 processed. When called from gnat_to_gnu_entity during the processing of a
6521 record type definition, the GCC nodes for the discriminants will be on
6522 the chain. The other calls to this function are recursive calls from
6523 itself for the Component_List of a variant and the chain is empty.
6525 PACKED is 1 if this is for a packed record, -1 if this is for a record
6526 with Component_Alignment of Storage_Unit, -2 if this is for a record
6527 with a specified alignment.
6529 DEFINITION is true if we are defining this record.
6531 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6532 with a rep clause is to be added. If it is nonzero, that is all that
6533 should be done with such fields.
6535 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6536 laying out the record. This means the alignment only serves to force fields
6537 to be bitfields, but not require the record to be that aligned. This is
6540 ALL_REP, if true, means a rep clause was found for all the fields. This
6541 simplifies the logic since we know we're not in the mixed case.
6543 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6544 modified afterwards so it will not be sent to the back-end for finalization.
6546 UNCHECKED_UNION, if true, means that we are building a type for a record
6547 with a Pragma Unchecked_Union.
6549 The processing of the component list fills in the chain with all of the
6550 fields of the record and then the record type is finished. */
6553 components_to_record (tree gnu_record_type, Node_Id component_list,
6554 tree gnu_field_list, int packed, bool definition,
6555 tree *p_gnu_rep_list, bool cancel_alignment,
6556 bool all_rep, bool do_not_finalize, bool unchecked_union)
6558 Node_Id component_decl;
6559 Entity_Id gnat_field;
6560 Node_Id variant_part;
6561 tree gnu_our_rep_list = NULL_TREE;
6562 tree gnu_field, gnu_last;
6563 bool layout_with_rep = false;
6564 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6566 /* For each variable within each component declaration create a GCC field
6567 and add it to the list, skipping any pragmas in the list. */
6568 if (Present (Component_Items (component_list)))
6569 for (component_decl = First_Non_Pragma (Component_Items (component_list));
6570 Present (component_decl);
6571 component_decl = Next_Non_Pragma (component_decl))
6573 gnat_field = Defining_Entity (component_decl);
6575 if (Chars (gnat_field) == Name_uParent)
6576 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
6579 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6580 packed, definition);
6582 /* If this is the _Tag field, put it before any discriminants,
6583 instead of after them as is the case for all other fields. */
6584 if (Chars (gnat_field) == Name_uTag)
6585 gnu_field_list = chainon (gnu_field_list, gnu_field);
6588 TREE_CHAIN (gnu_field) = gnu_field_list;
6589 gnu_field_list = gnu_field;
6593 save_gnu_tree (gnat_field, gnu_field, false);
6596 /* At the end of the component list there may be a variant part. */
6597 variant_part = Variant_Part (component_list);
6599 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6600 mutually exclusive and should go in the same memory. To do this we need
6601 to treat each variant as a record whose elements are created from the
6602 component list for the variant. So here we create the records from the
6603 lists for the variants and put them all into the QUAL_UNION_TYPE.
6604 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6605 use GNU_RECORD_TYPE if there are no fields so far. */
6606 if (Present (variant_part))
6608 tree gnu_discriminant = gnat_to_gnu (Name (variant_part));
6610 tree gnu_name = TYPE_NAME (gnu_record_type);
6612 = concat_id_with_name (get_identifier (Get_Name_String
6613 (Chars (Name (variant_part)))),
6615 tree gnu_union_type;
6616 tree gnu_union_name;
6617 tree gnu_union_field;
6618 tree gnu_variant_list = NULL_TREE;
6620 if (TREE_CODE (gnu_name) == TYPE_DECL)
6621 gnu_name = DECL_NAME (gnu_name);
6623 gnu_union_name = concat_id_with_name (gnu_name,
6624 IDENTIFIER_POINTER (gnu_var_name));
6626 /* Reuse an enclosing union if all fields are in the variant part
6627 and there is no representation clause on the record, to match
6628 the layout of C unions. There is an associated check below. */
6630 && TREE_CODE (gnu_record_type) == UNION_TYPE
6631 && !TYPE_PACKED (gnu_record_type))
6632 gnu_union_type = gnu_record_type;
6636 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6638 TYPE_NAME (gnu_union_type) = gnu_union_name;
6639 TYPE_ALIGN (gnu_union_type) = 0;
6640 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6643 for (variant = First_Non_Pragma (Variants (variant_part));
6645 variant = Next_Non_Pragma (variant))
6647 tree gnu_variant_type = make_node (RECORD_TYPE);
6648 tree gnu_inner_name;
6651 Get_Variant_Encoding (variant);
6652 gnu_inner_name = get_identifier (Name_Buffer);
6653 TYPE_NAME (gnu_variant_type)
6654 = concat_id_with_name (gnu_union_name,
6655 IDENTIFIER_POINTER (gnu_inner_name));
6657 /* Set the alignment of the inner type in case we need to make
6658 inner objects into bitfields, but then clear it out
6659 so the record actually gets only the alignment required. */
6660 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6661 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6663 /* Similarly, if the outer record has a size specified and all fields
6664 have record rep clauses, we can propagate the size into the
6666 if (all_rep_and_size)
6668 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6669 TYPE_SIZE_UNIT (gnu_variant_type)
6670 = TYPE_SIZE_UNIT (gnu_record_type);
6673 /* Create the record type for the variant. Note that we defer
6674 finalizing it until after we are sure to actually use it. */
6675 components_to_record (gnu_variant_type, Component_List (variant),
6676 NULL_TREE, packed, definition,
6677 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6678 true, unchecked_union);
6680 gnu_qual = choices_to_gnu (gnu_discriminant,
6681 Discrete_Choices (variant));
6683 Set_Present_Expr (variant, annotate_value (gnu_qual));
6685 /* If this is an Unchecked_Union and we have exactly one field,
6686 use this field directly to match the layout of C unions. */
6688 && TYPE_FIELDS (gnu_variant_type)
6689 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6690 gnu_field = TYPE_FIELDS (gnu_variant_type);
6693 /* Deal with packedness like in gnat_to_gnu_field. */
6695 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6697 /* Finalize the record type now. We used to throw away
6698 empty records but we no longer do that because we need
6699 them to generate complete debug info for the variant;
6700 otherwise, the union type definition will be lacking
6701 the fields associated with these empty variants. */
6702 rest_of_record_type_compilation (gnu_variant_type);
6704 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6705 gnu_union_type, field_packed,
6707 ? TYPE_SIZE (gnu_variant_type)
6710 ? bitsize_zero_node : 0),
6713 DECL_INTERNAL_P (gnu_field) = 1;
6715 if (!unchecked_union)
6716 DECL_QUALIFIER (gnu_field) = gnu_qual;
6719 TREE_CHAIN (gnu_field) = gnu_variant_list;
6720 gnu_variant_list = gnu_field;
6723 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
6724 if (gnu_variant_list)
6726 int union_field_packed;
6728 if (all_rep_and_size)
6730 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6731 TYPE_SIZE_UNIT (gnu_union_type)
6732 = TYPE_SIZE_UNIT (gnu_record_type);
6735 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6736 all_rep_and_size ? 1 : 0, false);
6738 /* If GNU_UNION_TYPE is our record type, it means we must have an
6739 Unchecked_Union with no fields. Verify that and, if so, just
6741 if (gnu_union_type == gnu_record_type)
6743 gcc_assert (unchecked_union
6745 && !gnu_our_rep_list);
6749 /* Deal with packedness like in gnat_to_gnu_field. */
6751 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6754 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6756 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6757 all_rep ? bitsize_zero_node : 0, 0);
6759 DECL_INTERNAL_P (gnu_union_field) = 1;
6760 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6761 gnu_field_list = gnu_union_field;
6765 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6766 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
6767 in a separate pass since we want to handle the discriminants but can't
6768 play with them until we've used them in debugging data above.
6770 ??? Note: if we then reorder them, debugging information will be wrong,
6771 but there's nothing that can be done about this at the moment. */
6772 for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; )
6774 if (DECL_FIELD_OFFSET (gnu_field))
6776 tree gnu_next = TREE_CHAIN (gnu_field);
6779 gnu_field_list = gnu_next;
6781 TREE_CHAIN (gnu_last) = gnu_next;
6783 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6784 gnu_our_rep_list = gnu_field;
6785 gnu_field = gnu_next;
6789 gnu_last = gnu_field;
6790 gnu_field = TREE_CHAIN (gnu_field);
6794 /* If we have any items in our rep'ed field list, it is not the case that all
6795 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
6796 set it and ignore the items. */
6797 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6798 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6799 else if (gnu_our_rep_list)
6801 /* Otherwise, sort the fields by bit position and put them into their
6802 own record if we have any fields without rep clauses. */
6804 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6805 int len = list_length (gnu_our_rep_list);
6806 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6809 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
6810 gnu_field = TREE_CHAIN (gnu_field), i++)
6811 gnu_arr[i] = gnu_field;
6813 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6815 /* Put the fields in the list in order of increasing position, which
6816 means we start from the end. */
6817 gnu_our_rep_list = NULL_TREE;
6818 for (i = len - 1; i >= 0; i--)
6820 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6821 gnu_our_rep_list = gnu_arr[i];
6822 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
6827 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
6828 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
6829 gnu_record_type, 0, 0, 0, 1);
6830 DECL_INTERNAL_P (gnu_field) = 1;
6831 gnu_field_list = chainon (gnu_field_list, gnu_field);
6835 layout_with_rep = true;
6836 gnu_field_list = nreverse (gnu_our_rep_list);
6840 if (cancel_alignment)
6841 TYPE_ALIGN (gnu_record_type) = 0;
6843 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
6844 layout_with_rep ? 1 : 0, do_not_finalize);
6847 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
6848 placed into an Esize, Component_Bit_Offset, or Component_Size value
6849 in the GNAT tree. */
6852 annotate_value (tree gnu_size)
6854 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
6856 Node_Ref_Or_Val ops[3], ret;
6859 struct tree_int_map **h = NULL;
6861 /* See if we've already saved the value for this node. */
6862 if (EXPR_P (gnu_size))
6864 struct tree_int_map in;
6865 if (!annotate_value_cache)
6866 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
6867 tree_int_map_eq, 0);
6868 in.base.from = gnu_size;
6869 h = (struct tree_int_map **)
6870 htab_find_slot (annotate_value_cache, &in, INSERT);
6873 return (Node_Ref_Or_Val) (*h)->to;
6876 /* If we do not return inside this switch, TCODE will be set to the
6877 code to use for a Create_Node operand and LEN (set above) will be
6878 the number of recursive calls for us to make. */
6880 switch (TREE_CODE (gnu_size))
6883 if (TREE_OVERFLOW (gnu_size))
6886 /* This may have come from a conversion from some smaller type,
6887 so ensure this is in bitsizetype. */
6888 gnu_size = convert (bitsizetype, gnu_size);
6890 /* For negative values, use NEGATE_EXPR of the supplied value. */
6891 if (tree_int_cst_sgn (gnu_size) < 0)
6893 /* The ridiculous code below is to handle the case of the largest
6894 negative integer. */
6895 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
6896 bool adjust = false;
6899 if (TREE_OVERFLOW (negative_size))
6902 = size_binop (MINUS_EXPR, bitsize_zero_node,
6903 size_binop (PLUS_EXPR, gnu_size,
6908 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
6910 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
6912 return annotate_value (temp);
6915 if (!host_integerp (gnu_size, 1))
6918 size = tree_low_cst (gnu_size, 1);
6920 /* This peculiar test is to make sure that the size fits in an int
6921 on machines where HOST_WIDE_INT is not "int". */
6922 if (tree_low_cst (gnu_size, 1) == size)
6923 return UI_From_Int (size);
6928 /* The only case we handle here is a simple discriminant reference. */
6929 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
6930 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
6931 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
6932 return Create_Node (Discrim_Val,
6933 annotate_value (DECL_DISCRIMINANT_NUMBER
6934 (TREE_OPERAND (gnu_size, 1))),
6939 CASE_CONVERT: case NON_LVALUE_EXPR:
6940 return annotate_value (TREE_OPERAND (gnu_size, 0));
6942 /* Now just list the operations we handle. */
6943 case COND_EXPR: tcode = Cond_Expr; break;
6944 case PLUS_EXPR: tcode = Plus_Expr; break;
6945 case MINUS_EXPR: tcode = Minus_Expr; break;
6946 case MULT_EXPR: tcode = Mult_Expr; break;
6947 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
6948 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
6949 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
6950 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
6951 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
6952 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
6953 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
6954 case NEGATE_EXPR: tcode = Negate_Expr; break;
6955 case MIN_EXPR: tcode = Min_Expr; break;
6956 case MAX_EXPR: tcode = Max_Expr; break;
6957 case ABS_EXPR: tcode = Abs_Expr; break;
6958 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
6959 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
6960 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
6961 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
6962 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
6963 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
6964 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
6965 case LT_EXPR: tcode = Lt_Expr; break;
6966 case LE_EXPR: tcode = Le_Expr; break;
6967 case GT_EXPR: tcode = Gt_Expr; break;
6968 case GE_EXPR: tcode = Ge_Expr; break;
6969 case EQ_EXPR: tcode = Eq_Expr; break;
6970 case NE_EXPR: tcode = Ne_Expr; break;
6976 /* Now get each of the operands that's relevant for this code. If any
6977 cannot be expressed as a repinfo node, say we can't. */
6978 for (i = 0; i < 3; i++)
6981 for (i = 0; i < len; i++)
6983 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
6984 if (ops[i] == No_Uint)
6988 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
6990 /* Save the result in the cache. */
6993 *h = GGC_NEW (struct tree_int_map);
6994 (*h)->base.from = gnu_size;
7001 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
7002 GCC type, set Component_Bit_Offset and Esize to the position and size
7006 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7010 Entity_Id gnat_field;
7012 /* We operate by first making a list of all fields and their positions
7013 (we can get the sizes easily at any time) by a recursive call
7014 and then update all the sizes into the tree. */
7015 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
7016 size_zero_node, bitsize_zero_node,
7019 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
7020 gnat_field = Next_Entity (gnat_field))
7021 if ((Ekind (gnat_field) == E_Component
7022 || (Ekind (gnat_field) == E_Discriminant
7023 && !Is_Unchecked_Union (Scope (gnat_field)))))
7025 tree parent_offset = bitsize_zero_node;
7027 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
7032 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7034 /* In this mode the tag and parent components have not been
7035 generated, so we add the appropriate offset to each
7036 component. For a component appearing in the current
7037 extension, the offset is the size of the parent. */
7038 if (Is_Derived_Type (gnat_entity)
7039 && Original_Record_Component (gnat_field) == gnat_field)
7041 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7044 parent_offset = bitsize_int (POINTER_SIZE);
7047 Set_Component_Bit_Offset
7050 (size_binop (PLUS_EXPR,
7051 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
7052 TREE_VALUE (TREE_VALUE
7053 (TREE_VALUE (gnu_entry)))),
7056 Set_Esize (gnat_field,
7057 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
7059 else if (Is_Tagged_Type (gnat_entity)
7060 && Is_Derived_Type (gnat_entity))
7062 /* If there is no gnu_entry, this is an inherited component whose
7063 position is the same as in the parent type. */
7064 Set_Component_Bit_Offset
7066 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7067 Set_Esize (gnat_field,
7068 Esize (Original_Record_Component (gnat_field)));
7073 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
7074 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
7075 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
7076 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
7077 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
7078 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
7082 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
7083 tree gnu_bitpos, unsigned int offset_align)
7086 tree gnu_result = gnu_list;
7088 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
7089 gnu_field = TREE_CHAIN (gnu_field))
7091 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7092 DECL_FIELD_BIT_OFFSET (gnu_field));
7093 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7094 DECL_FIELD_OFFSET (gnu_field));
7095 unsigned int our_offset_align
7096 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7099 = tree_cons (gnu_field,
7100 tree_cons (gnu_our_offset,
7101 tree_cons (size_int (our_offset_align),
7102 gnu_our_bitpos, NULL_TREE),
7106 if (DECL_INTERNAL_P (gnu_field))
7108 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
7109 gnu_our_offset, gnu_our_bitpos,
7116 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7117 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7118 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7119 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7120 for the size of a field. COMPONENT_P is true if we are being called
7121 to process the Component_Size of GNAT_OBJECT. This is used for error
7122 message handling and to indicate to use the object size of GNU_TYPE.
7123 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7124 it means that a size of zero should be treated as an unspecified size. */
7127 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7128 enum tree_code kind, bool component_p, bool zero_ok)
7130 Node_Id gnat_error_node;
7131 tree type_size, size;
7133 if (kind == VAR_DECL
7134 /* If a type needs strict alignment, a component of this type in
7135 a packed record cannot be packed and thus uses the type size. */
7136 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7137 type_size = TYPE_SIZE (gnu_type);
7139 type_size = rm_size (gnu_type);
7141 /* Find the node to use for errors. */
7142 if ((Ekind (gnat_object) == E_Component
7143 || Ekind (gnat_object) == E_Discriminant)
7144 && Present (Component_Clause (gnat_object)))
7145 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7146 else if (Present (Size_Clause (gnat_object)))
7147 gnat_error_node = Expression (Size_Clause (gnat_object));
7149 gnat_error_node = gnat_object;
7151 /* Return 0 if no size was specified, either because Esize was not Present or
7152 the specified size was zero. */
7153 if (No (uint_size) || uint_size == No_Uint)
7156 /* Get the size as a tree. Give an error if a size was specified, but cannot
7157 be represented as in sizetype. */
7158 size = UI_To_gnu (uint_size, bitsizetype);
7159 if (TREE_OVERFLOW (size))
7161 post_error_ne (component_p ? "component size of & is too large"
7162 : "size of & is too large",
7163 gnat_error_node, gnat_object);
7167 /* Ignore a negative size since that corresponds to our back-annotation.
7168 Also ignore a zero size unless a size clause exists. */
7169 else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7172 /* The size of objects is always a multiple of a byte. */
7173 if (kind == VAR_DECL
7174 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7177 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7178 gnat_error_node, gnat_object);
7180 post_error_ne ("size for& is not a multiple of Storage_Unit",
7181 gnat_error_node, gnat_object);
7185 /* If this is an integral type or a packed array type, the front-end has
7186 verified the size, so we need not do it here (which would entail
7187 checking against the bounds). However, if this is an aliased object, it
7188 may not be smaller than the type of the object. */
7189 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7190 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7193 /* If the object is a record that contains a template, add the size of
7194 the template to the specified size. */
7195 if (TREE_CODE (gnu_type) == RECORD_TYPE
7196 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7197 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7199 /* Modify the size of the type to be that of the maximum size if it has a
7201 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7202 type_size = max_size (type_size, true);
7204 /* If this is an access type or a fat pointer, the minimum size is that given
7205 by the smallest integral mode that's valid for pointers. */
7206 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7208 enum machine_mode p_mode;
7210 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7211 !targetm.valid_pointer_mode (p_mode);
7212 p_mode = GET_MODE_WIDER_MODE (p_mode))
7215 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7218 /* If the size of the object is a constant, the new size must not be
7220 if (TREE_CODE (type_size) != INTEGER_CST
7221 || TREE_OVERFLOW (type_size)
7222 || tree_int_cst_lt (size, type_size))
7226 ("component size for& too small{, minimum allowed is ^}",
7227 gnat_error_node, gnat_object, type_size);
7229 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7230 gnat_error_node, gnat_object, type_size);
7232 if (kind == VAR_DECL && !component_p
7233 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7234 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7235 post_error_ne_tree_2
7236 ("\\size of ^ is not a multiple of alignment (^ bits)",
7237 gnat_error_node, gnat_object, rm_size (gnu_type),
7238 TYPE_ALIGN (gnu_type));
7240 else if (INTEGRAL_TYPE_P (gnu_type))
7241 post_error_ne ("\\size would be legal if & were not aliased!",
7242 gnat_error_node, gnat_object);
7250 /* Similarly, but both validate and process a value of RM size. This
7251 routine is only called for types. */
7254 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7256 /* Only give an error if a Value_Size clause was explicitly given.
7257 Otherwise, we'd be duplicating an error on the Size clause. */
7258 Node_Id gnat_attr_node
7259 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7260 tree old_size = rm_size (gnu_type);
7263 /* Get the size as a tree. Do nothing if none was specified, either
7264 because RM size was not Present or if the specified size was zero.
7265 Give an error if a size was specified, but cannot be represented as
7267 if (No (uint_size) || uint_size == No_Uint)
7270 size = UI_To_gnu (uint_size, bitsizetype);
7271 if (TREE_OVERFLOW (size))
7273 if (Present (gnat_attr_node))
7274 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7280 /* Ignore a negative size since that corresponds to our back-annotation.
7281 Also ignore a zero size unless a size clause exists, a Value_Size
7282 clause exists, or this is an integer type, in which case the
7283 front end will have always set it. */
7284 else if (tree_int_cst_sgn (size) < 0
7285 || (integer_zerop (size) && No (gnat_attr_node)
7286 && !Has_Size_Clause (gnat_entity)
7287 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7290 /* If the old size is self-referential, get the maximum size. */
7291 if (CONTAINS_PLACEHOLDER_P (old_size))
7292 old_size = max_size (old_size, true);
7294 /* If the size of the object is a constant, the new size must not be
7295 smaller (the front end checks this for scalar types). */
7296 if (TREE_CODE (old_size) != INTEGER_CST
7297 || TREE_OVERFLOW (old_size)
7298 || (AGGREGATE_TYPE_P (gnu_type)
7299 && tree_int_cst_lt (size, old_size)))
7301 if (Present (gnat_attr_node))
7303 ("Value_Size for& too small{, minimum allowed is ^}",
7304 gnat_attr_node, gnat_entity, old_size);
7309 /* Otherwise, set the RM size proper for numerical types... */
7310 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7311 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7312 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7313 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7314 TYPE_RM_SIZE (gnu_type) = size;
7316 /* ...or the Ada size for record and union types. */
7317 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7318 || TREE_CODE (gnu_type) == UNION_TYPE
7319 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7320 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7321 SET_TYPE_ADA_SIZE (gnu_type, size);
7324 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7325 If TYPE is the best type, return it. Otherwise, make a new type. We
7326 only support new integral and pointer types. FOR_BIASED is true if
7327 we are making a biased type. */
7330 make_type_from_size (tree type, tree size_tree, bool for_biased)
7332 unsigned HOST_WIDE_INT size;
7336 /* If size indicates an error, just return TYPE to avoid propagating
7337 the error. Likewise if it's too large to represent. */
7338 if (!size_tree || !host_integerp (size_tree, 1))
7341 size = tree_low_cst (size_tree, 1);
7343 switch (TREE_CODE (type))
7348 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7349 && TYPE_BIASED_REPRESENTATION_P (type));
7351 /* Only do something if the type is not a packed array type and
7352 doesn't already have the proper size. */
7353 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7354 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7357 biased_p |= for_biased;
7358 size = MIN (size, LONG_LONG_TYPE_SIZE);
7360 if (TYPE_UNSIGNED (type) || biased_p)
7361 new_type = make_unsigned_type (size);
7363 new_type = make_signed_type (size);
7364 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7365 TYPE_MIN_VALUE (new_type)
7366 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
7367 TYPE_MAX_VALUE (new_type)
7368 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
7369 /* Propagate the name to avoid creating a fake subrange type. */
7370 if (TYPE_NAME (type))
7372 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7373 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7375 TYPE_NAME (new_type) = TYPE_NAME (type);
7377 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7378 TYPE_RM_SIZE (new_type) = bitsize_int (size);
7382 /* Do something if this is a fat pointer, in which case we
7383 may need to return the thin pointer. */
7384 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7386 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7387 if (!targetm.valid_pointer_mode (p_mode))
7390 build_pointer_type_for_mode
7391 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7397 /* Only do something if this is a thin pointer, in which case we
7398 may need to return the fat pointer. */
7399 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7401 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7411 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7412 a type or object whose present alignment is ALIGN. If this alignment is
7413 valid, return it. Otherwise, give an error and return ALIGN. */
7416 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7418 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7419 unsigned int new_align;
7420 Node_Id gnat_error_node;
7422 /* Don't worry about checking alignment if alignment was not specified
7423 by the source program and we already posted an error for this entity. */
7424 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7427 /* Post the error on the alignment clause if any. */
7428 if (Present (Alignment_Clause (gnat_entity)))
7429 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7431 gnat_error_node = gnat_entity;
7433 /* Within GCC, an alignment is an integer, so we must make sure a value is
7434 specified that fits in that range. Also, there is an upper bound to
7435 alignments we can support/allow. */
7436 if (!UI_Is_In_Int_Range (alignment)
7437 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7438 post_error_ne_num ("largest supported alignment for& is ^",
7439 gnat_error_node, gnat_entity, max_allowed_alignment);
7440 else if (!(Present (Alignment_Clause (gnat_entity))
7441 && From_At_Mod (Alignment_Clause (gnat_entity)))
7442 && new_align * BITS_PER_UNIT < align)
7443 post_error_ne_num ("alignment for& must be at least ^",
7444 gnat_error_node, gnat_entity,
7445 align / BITS_PER_UNIT);
7448 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7449 if (new_align > align)
7456 /* Return the smallest alignment not less than SIZE. */
7459 ceil_alignment (unsigned HOST_WIDE_INT size)
7461 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7464 /* Verify that OBJECT, a type or decl, is something we can implement
7465 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7466 if we require atomic components. */
7469 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7471 Node_Id gnat_error_point = gnat_entity;
7473 enum machine_mode mode;
7477 /* There are three case of what OBJECT can be. It can be a type, in which
7478 case we take the size, alignment and mode from the type. It can be a
7479 declaration that was indirect, in which case the relevant values are
7480 that of the type being pointed to, or it can be a normal declaration,
7481 in which case the values are of the decl. The code below assumes that
7482 OBJECT is either a type or a decl. */
7483 if (TYPE_P (object))
7485 mode = TYPE_MODE (object);
7486 align = TYPE_ALIGN (object);
7487 size = TYPE_SIZE (object);
7489 else if (DECL_BY_REF_P (object))
7491 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7492 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7493 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7497 mode = DECL_MODE (object);
7498 align = DECL_ALIGN (object);
7499 size = DECL_SIZE (object);
7502 /* Consider all floating-point types atomic and any types that that are
7503 represented by integers no wider than a machine word. */
7504 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7505 || ((GET_MODE_CLASS (mode) == MODE_INT
7506 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7507 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7510 /* For the moment, also allow anything that has an alignment equal
7511 to its size and which is smaller than a word. */
7512 if (size && TREE_CODE (size) == INTEGER_CST
7513 && compare_tree_int (size, align) == 0
7514 && align <= BITS_PER_WORD)
7517 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7518 gnat_node = Next_Rep_Item (gnat_node))
7520 if (!comp_p && Nkind (gnat_node) == N_Pragma
7521 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7523 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7524 else if (comp_p && Nkind (gnat_node) == N_Pragma
7525 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7526 == Pragma_Atomic_Components))
7527 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7531 post_error_ne ("atomic access to component of & cannot be guaranteed",
7532 gnat_error_point, gnat_entity);
7534 post_error_ne ("atomic access to & cannot be guaranteed",
7535 gnat_error_point, gnat_entity);
7538 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7539 have compatible signatures so that a call using one type may be safely
7540 issued if the actual target function type is the other. Return 1 if it is
7541 the case, 0 otherwise, and post errors on the incompatibilities.
7543 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7544 that calls to the subprogram will have arguments suitable for the later
7545 underlying builtin expansion. */
7548 compatible_signatures_p (tree ftype1, tree ftype2)
7550 /* As of now, we only perform very trivial tests and consider it's the
7551 programmer's responsibility to ensure the type correctness in the Ada
7552 declaration, as in the regular Import cases.
7554 Mismatches typically result in either error messages from the builtin
7555 expander, internal compiler errors, or in a real call sequence. This
7556 should be refined to issue diagnostics helping error detection and
7559 /* Almost fake test, ensuring a use of each argument. */
7560 if (ftype1 == ftype2)
7566 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
7567 type with all size expressions that contain F in a PLACEHOLDER_EXPR
7568 updated by replacing F with R.
7570 The function doesn't update the layout of the type, i.e. it assumes
7571 that the substitution is purely formal. That's why the replacement
7572 value R must itself contain a PLACEHOLDER_EXPR. */
7575 substitute_in_type (tree t, tree f, tree r)
7579 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
7581 switch (TREE_CODE (t))
7586 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7587 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7589 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7590 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7592 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7595 new = build_range_type (TREE_TYPE (t), low, high);
7596 if (TYPE_INDEX_TYPE (t))
7598 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7605 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
7606 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
7608 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
7609 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
7611 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
7614 new = copy_type (t);
7615 TYPE_MIN_VALUE (new) = low;
7616 TYPE_MAX_VALUE (new) = high;
7623 new = substitute_in_type (TREE_TYPE (t), f, r);
7624 if (new == TREE_TYPE (t))
7627 return build_complex_type (new);
7633 /* These should never show up here. */
7638 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7639 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7641 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7644 new = build_array_type (component, domain);
7645 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7646 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7647 SET_TYPE_MODE (new, TYPE_MODE (t));
7648 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7649 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7650 TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t);
7651 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7652 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7658 case QUAL_UNION_TYPE:
7660 bool changed_field = false;
7663 /* Start out with no fields, make new fields, and chain them
7664 in. If we haven't actually changed the type of any field,
7665 discard everything we've done and return the old type. */
7666 new = copy_type (t);
7667 TYPE_FIELDS (new) = NULL_TREE;
7669 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7671 tree new_field = copy_node (field), new_n;
7673 new_n = substitute_in_type (TREE_TYPE (field), f, r);
7674 if (new_n != TREE_TYPE (field))
7676 TREE_TYPE (new_field) = new_n;
7677 changed_field = true;
7680 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
7681 if (new_n != DECL_FIELD_OFFSET (field))
7683 DECL_FIELD_OFFSET (new_field) = new_n;
7684 changed_field = true;
7687 /* Do the substitution inside the qualifier, if any. */
7688 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7690 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7691 if (new_n != DECL_QUALIFIER (field))
7693 DECL_QUALIFIER (new_field) = new_n;
7694 changed_field = true;
7698 DECL_CONTEXT (new_field) = new;
7699 SET_DECL_ORIGINAL_FIELD (new_field,
7700 (DECL_ORIGINAL_FIELD (field)
7701 ? DECL_ORIGINAL_FIELD (field) : field));
7703 TREE_CHAIN (new_field) = TYPE_FIELDS (new);
7704 TYPE_FIELDS (new) = new_field;
7710 TYPE_FIELDS (new) = nreverse (TYPE_FIELDS (new));
7711 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7712 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7713 SET_TYPE_ADA_SIZE (new, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
7722 /* Return the RM size of GNU_TYPE. This is the actual number of bits
7723 needed to represent the object. */
7726 rm_size (tree gnu_type)
7728 /* For integer types, this is the precision. */
7729 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7730 return TYPE_RM_SIZE (gnu_type);
7732 /* Return the RM size of the actual data plus the size of the template. */
7733 if (TREE_CODE (gnu_type) == RECORD_TYPE
7734 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7736 size_binop (PLUS_EXPR,
7737 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7738 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7740 /* For record types, we store the size explicitly. */
7741 if ((TREE_CODE (gnu_type) == RECORD_TYPE
7742 || TREE_CODE (gnu_type) == UNION_TYPE
7743 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7744 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7745 && TYPE_ADA_SIZE (gnu_type))
7746 return TYPE_ADA_SIZE (gnu_type);
7748 /* For other types, this is just the size. */
7749 return TYPE_SIZE (gnu_type);
7752 /* Return an identifier representing the external name to be used for
7753 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7754 and the specified suffix. */
7757 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7759 Entity_Kind kind = Ekind (gnat_entity);
7761 const char *str = (!suffix ? "" : suffix);
7762 String_Template temp = {1, strlen (str)};
7763 Fat_Pointer fp = {str, &temp};
7765 Get_External_Name_With_Suffix (gnat_entity, fp);
7767 /* A variable using the Stdcall convention (meaning we are running
7768 on a Windows box) live in a DLL. Here we adjust its name to use
7769 the jump-table, the _imp__NAME contains the address for the NAME
7771 if ((kind == E_Variable || kind == E_Constant)
7772 && Has_Stdcall_Convention (gnat_entity))
7774 const char *prefix = "_imp__";
7775 int k, plen = strlen (prefix);
7777 for (k = 0; k <= Name_Len; k++)
7778 Name_Buffer [Name_Len - k + plen] = Name_Buffer [Name_Len - k];
7779 strncpy (Name_Buffer, prefix, plen);
7782 return get_identifier (Name_Buffer);
7785 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7786 fully-qualified name, possibly with type information encoding.
7787 Otherwise, return the name. */
7790 get_entity_name (Entity_Id gnat_entity)
7792 Get_Encoded_Name (gnat_entity);
7793 return get_identifier (Name_Buffer);
7796 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
7797 string, return a new IDENTIFIER_NODE that is the concatenation of
7798 the name in GNU_ID and SUFFIX. */
7801 concat_id_with_name (tree gnu_id, const char *suffix)
7803 int len = IDENTIFIER_LENGTH (gnu_id);
7805 strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id), len);
7806 strncpy (Name_Buffer + len, "___", 3);
7808 strcpy (Name_Buffer + len, suffix);
7809 return get_identifier (Name_Buffer);
7812 #include "gt-ada-decl.h"