1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2010, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License along with GCC; see the file COPYING3. If not see *
19 * <http://www.gnu.org/licenses/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
28 #include "coretypes.h"
36 #include "tree-inline.h"
54 #ifndef MAX_FIXED_MODE_SIZE
55 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
58 /* Convention_Stdcall should be processed in a specific way on Windows targets
59 only. The macro below is a helper to avoid having to check for a Windows
60 specific attribute throughout this unit. */
62 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
63 #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall)
65 #define Has_Stdcall_Convention(E) (0)
68 /* Stack realignment for functions with foreign conventions is provided on a
69 per back-end basis now, as it is handled by the prologue expanders and not
70 as part of the function's body any more. It might be requested by way of a
71 dedicated function type attribute on the targets that support it.
73 We need a way to avoid setting the attribute on the targets that don't
74 support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose.
76 It is defined on targets where the circuitry is available, and indicates
77 whether the realignment is needed for 'main'. We use this to decide for
78 foreign subprograms as well.
80 It is not defined on targets where the circuitry is not implemented, and
81 we just never set the attribute in these cases.
83 Whether it is defined on all targets that would need it in theory is
84 not entirely clear. We currently trust the base GCC settings for this
87 #ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
88 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 0
93 struct incomplete *next;
98 /* These variables are used to defer recursively expanding incomplete types
99 while we are processing an array, a record or a subprogram type. */
100 static int defer_incomplete_level = 0;
101 static struct incomplete *defer_incomplete_list;
103 /* This variable is used to delay expanding From_With_Type types until the
105 static struct incomplete *defer_limited_with;
107 /* These variables are used to defer finalizing types. The element of the
108 list is the TYPE_DECL associated with the type. */
109 static int defer_finalize_level = 0;
110 static VEC (tree,heap) *defer_finalize_list;
112 /* A hash table used to cache the result of annotate_value. */
113 static GTY ((if_marked ("tree_int_map_marked_p"),
114 param_is (struct tree_int_map))) htab_t annotate_value_cache;
123 static void relate_alias_sets (tree, tree, enum alias_set_op);
125 static bool allocatable_size_p (tree, bool);
126 static void prepend_one_attribute_to (struct attrib **,
127 enum attr_type, tree, tree, Node_Id);
128 static void prepend_attributes (Entity_Id, struct attrib **);
129 static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool);
130 static bool is_variable_size (tree);
131 static tree elaborate_expression_1 (tree, Entity_Id, tree, bool, bool);
132 static tree make_packable_type (tree, bool);
133 static tree gnat_to_gnu_component_type (Entity_Id, bool, bool);
134 static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool,
136 static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool);
137 static bool same_discriminant_p (Entity_Id, Entity_Id);
138 static bool array_type_has_nonaliased_component (tree, Entity_Id);
139 static bool compile_time_known_address_p (Node_Id);
140 static bool cannot_be_superflat_p (Node_Id);
141 static bool constructor_address_p (tree);
142 static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
143 bool, bool, bool, bool, bool);
144 static Uint annotate_value (tree);
145 static void annotate_rep (Entity_Id, tree);
146 static tree build_position_list (tree, bool, tree, tree, unsigned int, tree);
147 static tree build_subst_list (Entity_Id, Entity_Id, bool);
148 static tree build_variant_list (tree, tree, tree);
149 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
150 static void set_rm_size (Uint, tree, Entity_Id);
151 static tree make_type_from_size (tree, tree, bool);
152 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
153 static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
154 static void check_ok_for_atomic (tree, Entity_Id, bool);
155 static int compatible_signatures_p (tree, tree);
156 static tree create_field_decl_from (tree, tree, tree, tree, tree, tree);
157 static tree get_rep_part (tree);
158 static tree get_variant_part (tree);
159 static tree create_variant_part_from (tree, tree, tree, tree, tree);
160 static void copy_and_substitute_in_size (tree, tree, tree);
161 static void rest_of_type_decl_compilation_no_defer (tree);
163 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
164 entity, return the equivalent GCC tree for that entity (a ..._DECL node)
165 and associate the ..._DECL node with the input GNAT defining identifier.
167 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
168 initial value (in GCC tree form). This is optional for a variable. For
169 a renamed entity, GNU_EXPR gives the object being renamed.
171 DEFINITION is nonzero if this call is intended for a definition. This is
172 used for separate compilation where it is necessary to know whether an
173 external declaration or a definition must be created if the GCC equivalent
174 was not created previously. The value of 1 is normally used for a nonzero
175 DEFINITION, but a value of 2 is used in special circumstances, defined in
179 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
181 /* Contains the kind of the input GNAT node. */
182 const Entity_Kind kind = Ekind (gnat_entity);
183 /* True if this is a type. */
184 const bool is_type = IN (kind, Type_Kind);
185 /* For a type, contains the equivalent GNAT node to be used in gigi. */
186 Entity_Id gnat_equiv_type = Empty;
187 /* Temporary used to walk the GNAT tree. */
189 /* Contains the GCC DECL node which is equivalent to the input GNAT node.
190 This node will be associated with the GNAT node by calling at the end
191 of the `switch' statement. */
192 tree gnu_decl = NULL_TREE;
193 /* Contains the GCC type to be used for the GCC node. */
194 tree gnu_type = NULL_TREE;
195 /* Contains the GCC size tree to be used for the GCC node. */
196 tree gnu_size = NULL_TREE;
197 /* Contains the GCC name to be used for the GCC node. */
198 tree gnu_entity_name;
199 /* True if we have already saved gnu_decl as a GNAT association. */
201 /* True if we incremented defer_incomplete_level. */
202 bool this_deferred = false;
203 /* True if we incremented force_global. */
204 bool this_global = false;
205 /* True if we should check to see if elaborated during processing. */
206 bool maybe_present = false;
207 /* True if we made GNU_DECL and its type here. */
208 bool this_made_decl = false;
209 /* True if debug info is requested for this entity. */
210 bool debug_info_p = Needs_Debug_Info (gnat_entity);
211 /* True if this entity is to be considered as imported. */
212 bool imported_p = (Is_Imported (gnat_entity)
213 && No (Address_Clause (gnat_entity)));
214 /* Size and alignment of the GCC node, if meaningful. */
215 unsigned int esize = 0, align = 0;
216 /* Contains the list of attributes directly attached to the entity. */
217 struct attrib *attr_list = NULL;
219 /* Since a use of an Itype is a definition, process it as such if it
220 is not in a with'ed unit. */
223 && Is_Itype (gnat_entity)
224 && !present_gnu_tree (gnat_entity)
225 && In_Extended_Main_Code_Unit (gnat_entity))
227 /* Ensure that we are in a subprogram mentioned in the Scope chain of
228 this entity, our current scope is global, or we encountered a task
229 or entry (where we can't currently accurately check scoping). */
230 if (!current_function_decl
231 || DECL_ELABORATION_PROC_P (current_function_decl))
233 process_type (gnat_entity);
234 return get_gnu_tree (gnat_entity);
237 for (gnat_temp = Scope (gnat_entity);
239 gnat_temp = Scope (gnat_temp))
241 if (Is_Type (gnat_temp))
242 gnat_temp = Underlying_Type (gnat_temp);
244 if (Ekind (gnat_temp) == E_Subprogram_Body)
246 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
248 if (IN (Ekind (gnat_temp), Subprogram_Kind)
249 && Present (Protected_Body_Subprogram (gnat_temp)))
250 gnat_temp = Protected_Body_Subprogram (gnat_temp);
252 if (Ekind (gnat_temp) == E_Entry
253 || Ekind (gnat_temp) == E_Entry_Family
254 || Ekind (gnat_temp) == E_Task_Type
255 || (IN (Ekind (gnat_temp), Subprogram_Kind)
256 && present_gnu_tree (gnat_temp)
257 && (current_function_decl
258 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
260 process_type (gnat_entity);
261 return get_gnu_tree (gnat_entity);
265 /* This abort means the Itype has an incorrect scope, i.e. that its
266 scope does not correspond to the subprogram it is declared in. */
270 /* If we've already processed this entity, return what we got last time.
271 If we are defining the node, we should not have already processed it.
272 In that case, we will abort below when we try to save a new GCC tree
273 for this object. We also need to handle the case of getting a dummy
274 type when a Full_View exists. */
275 if ((!definition || (is_type && imported_p))
276 && present_gnu_tree (gnat_entity))
278 gnu_decl = get_gnu_tree (gnat_entity);
280 if (TREE_CODE (gnu_decl) == TYPE_DECL
281 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
282 && IN (kind, Incomplete_Or_Private_Kind)
283 && Present (Full_View (gnat_entity)))
286 = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0);
287 save_gnu_tree (gnat_entity, NULL_TREE, false);
288 save_gnu_tree (gnat_entity, gnu_decl, false);
294 /* If this is a numeric or enumeral type, or an access type, a nonzero
295 Esize must be specified unless it was specified by the programmer. */
296 gcc_assert (!Unknown_Esize (gnat_entity)
297 || Has_Size_Clause (gnat_entity)
298 || (!IN (kind, Numeric_Kind)
299 && !IN (kind, Enumeration_Kind)
300 && (!IN (kind, Access_Kind)
301 || kind == E_Access_Protected_Subprogram_Type
302 || kind == E_Anonymous_Access_Protected_Subprogram_Type
303 || kind == E_Access_Subtype)));
305 /* The RM size must be specified for all discrete and fixed-point types. */
306 gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind)
307 && Unknown_RM_Size (gnat_entity)));
309 /* If we get here, it means we have not yet done anything with this entity.
310 If we are not defining it, it must be a type or an entity that is defined
311 elsewhere or externally, otherwise we should have defined it already. */
312 gcc_assert (definition
313 || type_annotate_only
315 || kind == E_Discriminant
316 || kind == E_Component
318 || (kind == E_Constant && Present (Full_View (gnat_entity)))
319 || Is_Public (gnat_entity));
321 /* Get the name of the entity and set up the line number and filename of
322 the original definition for use in any decl we make. */
323 gnu_entity_name = get_entity_name (gnat_entity);
324 Sloc_to_locus (Sloc (gnat_entity), &input_location);
326 /* For cases when we are not defining (i.e., we are referencing from
327 another compilation unit) public entities, show we are at global level
328 for the purpose of computing scopes. Don't do this for components or
329 discriminants since the relevant test is whether or not the record is
332 && kind != E_Component
333 && kind != E_Discriminant
334 && Is_Public (gnat_entity)
335 && !Is_Statically_Allocated (gnat_entity))
336 force_global++, this_global = true;
338 /* Handle any attributes directly attached to the entity. */
339 if (Has_Gigi_Rep_Item (gnat_entity))
340 prepend_attributes (gnat_entity, &attr_list);
342 /* Do some common processing for types. */
345 /* Compute the equivalent type to be used in gigi. */
346 gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
348 /* Machine_Attributes on types are expected to be propagated to
349 subtypes. The corresponding Gigi_Rep_Items are only attached
350 to the first subtype though, so we handle the propagation here. */
351 if (Base_Type (gnat_entity) != gnat_entity
352 && !Is_First_Subtype (gnat_entity)
353 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
354 prepend_attributes (First_Subtype (Base_Type (gnat_entity)),
357 /* Compute a default value for the size of the type. */
358 if (Known_Esize (gnat_entity)
359 && UI_Is_In_Int_Range (Esize (gnat_entity)))
361 unsigned int max_esize;
362 esize = UI_To_Int (Esize (gnat_entity));
364 if (IN (kind, Float_Kind))
365 max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
366 else if (IN (kind, Access_Kind))
367 max_esize = POINTER_SIZE * 2;
369 max_esize = LONG_LONG_TYPE_SIZE;
371 if (esize > max_esize)
375 esize = LONG_LONG_TYPE_SIZE;
381 /* If this is a use of a deferred constant without address clause,
382 get its full definition. */
384 && No (Address_Clause (gnat_entity))
385 && Present (Full_View (gnat_entity)))
388 = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
393 /* If we have an external constant that we are not defining, get the
394 expression that is was defined to represent. We may throw that
395 expression away later if it is not a constant. Do not retrieve the
396 expression if it is an aggregate or allocator, because in complex
397 instantiation contexts it may not be expanded */
399 && Present (Expression (Declaration_Node (gnat_entity)))
400 && !No_Initialization (Declaration_Node (gnat_entity))
401 && (Nkind (Expression (Declaration_Node (gnat_entity)))
403 && (Nkind (Expression (Declaration_Node (gnat_entity)))
405 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
407 /* Ignore deferred constant definitions without address clause since
408 they are processed fully in the front-end. If No_Initialization
409 is set, this is not a deferred constant but a constant whose value
410 is built manually. And constants that are renamings are handled
414 && No (Address_Clause (gnat_entity))
415 && !No_Initialization (Declaration_Node (gnat_entity))
416 && No (Renamed_Object (gnat_entity)))
418 gnu_decl = error_mark_node;
423 /* Ignore constant definitions already marked with the error node. See
424 the N_Object_Declaration case of gnat_to_gnu for the rationale. */
427 && present_gnu_tree (gnat_entity)
428 && get_gnu_tree (gnat_entity) == error_mark_node)
430 maybe_present = true;
437 /* We used to special case VMS exceptions here to directly map them to
438 their associated condition code. Since this code had to be masked
439 dynamically to strip off the severity bits, this caused trouble in
440 the GCC/ZCX case because the "type" pointers we store in the tables
441 have to be static. We now don't special case here anymore, and let
442 the regular processing take place, which leaves us with a regular
443 exception data object for VMS exceptions too. The condition code
444 mapping is taken care of by the front end and the bitmasking by the
451 /* The GNAT record where the component was defined. */
452 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
454 /* If the variable is an inherited record component (in the case of
455 extended record types), just return the inherited entity, which
456 must be a FIELD_DECL. Likewise for discriminants.
457 For discriminants of untagged records which have explicit
458 stored discriminants, return the entity for the corresponding
459 stored discriminant. Also use Original_Record_Component
460 if the record has a private extension. */
461 if (Present (Original_Record_Component (gnat_entity))
462 && Original_Record_Component (gnat_entity) != gnat_entity)
465 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
466 gnu_expr, definition);
471 /* If the enclosing record has explicit stored discriminants,
472 then it is an untagged record. If the Corresponding_Discriminant
473 is not empty then this must be a renamed discriminant and its
474 Original_Record_Component must point to the corresponding explicit
475 stored discriminant (i.e. we should have taken the previous
477 else if (Present (Corresponding_Discriminant (gnat_entity))
478 && Is_Tagged_Type (gnat_record))
480 /* A tagged record has no explicit stored discriminants. */
481 gcc_assert (First_Discriminant (gnat_record)
482 == First_Stored_Discriminant (gnat_record));
484 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
485 gnu_expr, definition);
490 else if (Present (CR_Discriminant (gnat_entity))
491 && type_annotate_only)
493 gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
494 gnu_expr, definition);
499 /* If the enclosing record has explicit stored discriminants, then
500 it is an untagged record. If the Corresponding_Discriminant
501 is not empty then this must be a renamed discriminant and its
502 Original_Record_Component must point to the corresponding explicit
503 stored discriminant (i.e. we should have taken the first
505 else if (Present (Corresponding_Discriminant (gnat_entity))
506 && (First_Discriminant (gnat_record)
507 != First_Stored_Discriminant (gnat_record)))
510 /* Otherwise, if we are not defining this and we have no GCC type
511 for the containing record, make one for it. Then we should
512 have made our own equivalent. */
513 else if (!definition && !present_gnu_tree (gnat_record))
515 /* ??? If this is in a record whose scope is a protected
516 type and we have an Original_Record_Component, use it.
517 This is a workaround for major problems in protected type
519 Entity_Id Scop = Scope (Scope (gnat_entity));
520 if ((Is_Protected_Type (Scop)
521 || (Is_Private_Type (Scop)
522 && Present (Full_View (Scop))
523 && Is_Protected_Type (Full_View (Scop))))
524 && Present (Original_Record_Component (gnat_entity)))
527 = gnat_to_gnu_entity (Original_Record_Component
534 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
535 gnu_decl = get_gnu_tree (gnat_entity);
541 /* Here we have no GCC type and this is a reference rather than a
542 definition. This should never happen. Most likely the cause is
543 reference before declaration in the gnat tree for gnat_entity. */
547 case E_Loop_Parameter:
548 case E_Out_Parameter:
551 /* Simple variables, loop variables, Out parameters, and exceptions. */
554 bool used_by_ref = false;
556 = ((kind == E_Constant || kind == E_Variable)
557 && Is_True_Constant (gnat_entity)
558 && !Treat_As_Volatile (gnat_entity)
559 && (((Nkind (Declaration_Node (gnat_entity))
560 == N_Object_Declaration)
561 && Present (Expression (Declaration_Node (gnat_entity))))
562 || Present (Renamed_Object (gnat_entity))));
563 bool inner_const_flag = const_flag;
564 bool static_p = Is_Statically_Allocated (gnat_entity);
565 bool mutable_p = false;
566 tree gnu_ext_name = NULL_TREE;
567 tree renamed_obj = NULL_TREE;
568 tree gnu_object_size;
570 if (Present (Renamed_Object (gnat_entity)) && !definition)
572 if (kind == E_Exception)
573 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
576 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
579 /* Get the type after elaborating the renamed object. */
580 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
582 /* For a debug renaming declaration, build a pure debug entity. */
583 if (Present (Debug_Renaming_Link (gnat_entity)))
586 gnu_decl = build_decl (input_location,
587 VAR_DECL, gnu_entity_name, gnu_type);
588 /* The (MEM (CONST (0))) pattern is prescribed by STABS. */
589 if (global_bindings_p ())
590 addr = gen_rtx_CONST (VOIDmode, const0_rtx);
592 addr = stack_pointer_rtx;
593 SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
594 gnat_pushdecl (gnu_decl, gnat_entity);
598 /* If this is a loop variable, its type should be the base type.
599 This is because the code for processing a loop determines whether
600 a normal loop end test can be done by comparing the bounds of the
601 loop against those of the base type, which is presumed to be the
602 size used for computation. But this is not correct when the size
603 of the subtype is smaller than the type. */
604 if (kind == E_Loop_Parameter)
605 gnu_type = get_base_type (gnu_type);
607 /* Reject non-renamed objects whose types are unconstrained arrays or
608 any object whose type is a dummy type or VOID_TYPE. */
610 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
611 && No (Renamed_Object (gnat_entity)))
612 || TYPE_IS_DUMMY_P (gnu_type)
613 || TREE_CODE (gnu_type) == VOID_TYPE)
615 gcc_assert (type_annotate_only);
618 return error_mark_node;
621 /* If an alignment is specified, use it if valid. Note that exceptions
622 are objects but don't have an alignment. We must do this before we
623 validate the size, since the alignment can affect the size. */
624 if (kind != E_Exception && Known_Alignment (gnat_entity))
626 gcc_assert (Present (Alignment (gnat_entity)));
627 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
628 TYPE_ALIGN (gnu_type));
629 /* No point in changing the type if there is an address clause
630 as the final type of the object will be a reference type. */
631 if (Present (Address_Clause (gnat_entity)))
635 = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
636 false, false, definition, true);
639 /* If we are defining the object, see if it has a Size value and
640 validate it if so. If we are not defining the object and a Size
641 clause applies, simply retrieve the value. We don't want to ignore
642 the clause and it is expected to have been validated already. Then
643 get the new type, if any. */
645 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
646 gnat_entity, VAR_DECL, false,
647 Has_Size_Clause (gnat_entity));
648 else if (Has_Size_Clause (gnat_entity))
649 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
654 = make_type_from_size (gnu_type, gnu_size,
655 Has_Biased_Representation (gnat_entity));
657 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
658 gnu_size = NULL_TREE;
661 /* If this object has self-referential size, it must be a record with
662 a default value. We are supposed to allocate an object of the
663 maximum size in this case unless it is a constant with an
664 initializing expression, in which case we can get the size from
665 that. Note that the resulting size may still be a variable, so
666 this may end up with an indirect allocation. */
667 if (No (Renamed_Object (gnat_entity))
668 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
670 if (gnu_expr && kind == E_Constant)
672 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
673 if (CONTAINS_PLACEHOLDER_P (size))
675 /* If the initializing expression is itself a constant,
676 despite having a nominal type with self-referential
677 size, we can get the size directly from it. */
678 if (TREE_CODE (gnu_expr) == COMPONENT_REF
680 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
681 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
682 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
683 || DECL_READONLY_ONCE_ELAB
684 (TREE_OPERAND (gnu_expr, 0))))
685 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
688 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
693 /* We may have no GNU_EXPR because No_Initialization is
694 set even though there's an Expression. */
695 else if (kind == E_Constant
696 && (Nkind (Declaration_Node (gnat_entity))
697 == N_Object_Declaration)
698 && Present (Expression (Declaration_Node (gnat_entity))))
700 = TYPE_SIZE (gnat_to_gnu_type
702 (Expression (Declaration_Node (gnat_entity)))));
705 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
710 /* If the size is zero bytes, make it one byte since some linkers have
711 trouble with zero-sized objects. If the object will have a
712 template, that will make it nonzero so don't bother. Also avoid
713 doing that for an object renaming or an object with an address
714 clause, as we would lose useful information on the view size
715 (e.g. for null array slices) and we are not allocating the object
718 && integer_zerop (gnu_size)
719 && !TREE_OVERFLOW (gnu_size))
720 || (TYPE_SIZE (gnu_type)
721 && integer_zerop (TYPE_SIZE (gnu_type))
722 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
723 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
724 || !Is_Array_Type (Etype (gnat_entity)))
725 && No (Renamed_Object (gnat_entity))
726 && No (Address_Clause (gnat_entity)))
727 gnu_size = bitsize_unit_node;
729 /* If this is an object with no specified size and alignment, and
730 if either it is atomic or we are not optimizing alignment for
731 space and it is composite and not an exception, an Out parameter
732 or a reference to another object, and the size of its type is a
733 constant, set the alignment to the smallest one which is not
734 smaller than the size, with an appropriate cap. */
735 if (!gnu_size && align == 0
736 && (Is_Atomic (gnat_entity)
737 || (!Optimize_Alignment_Space (gnat_entity)
738 && kind != E_Exception
739 && kind != E_Out_Parameter
740 && Is_Composite_Type (Etype (gnat_entity))
741 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
743 && No (Renamed_Object (gnat_entity))
744 && No (Address_Clause (gnat_entity))))
745 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
747 /* No point in jumping through all the hoops needed in order
748 to support BIGGEST_ALIGNMENT if we don't really have to.
749 So we cap to the smallest alignment that corresponds to
750 a known efficient memory access pattern of the target. */
751 unsigned int align_cap = Is_Atomic (gnat_entity)
753 : get_mode_alignment (ptr_mode);
755 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
756 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
759 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
761 /* But make sure not to under-align the object. */
762 if (align <= TYPE_ALIGN (gnu_type))
765 /* And honor the minimum valid atomic alignment, if any. */
766 #ifdef MINIMUM_ATOMIC_ALIGNMENT
767 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
768 align = MINIMUM_ATOMIC_ALIGNMENT;
772 /* If the object is set to have atomic components, find the component
773 type and validate it.
775 ??? Note that we ignore Has_Volatile_Components on objects; it's
776 not at all clear what to do in that case. */
778 if (Has_Atomic_Components (gnat_entity))
780 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
781 ? TREE_TYPE (gnu_type) : gnu_type);
783 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
784 && TYPE_MULTI_ARRAY_P (gnu_inner))
785 gnu_inner = TREE_TYPE (gnu_inner);
787 check_ok_for_atomic (gnu_inner, gnat_entity, true);
790 /* Now check if the type of the object allows atomic access. Note
791 that we must test the type, even if this object has size and
792 alignment to allow such access, because we will be going
793 inside the padded record to assign to the object. We could fix
794 this by always copying via an intermediate value, but it's not
795 clear it's worth the effort. */
796 if (Is_Atomic (gnat_entity))
797 check_ok_for_atomic (gnu_type, gnat_entity, false);
799 /* If this is an aliased object with an unconstrained nominal subtype,
800 make a type that includes the template. */
801 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
802 && Is_Array_Type (Etype (gnat_entity))
803 && !type_annotate_only)
806 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
809 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
810 concat_name (gnu_entity_name,
814 #ifdef MINIMUM_ATOMIC_ALIGNMENT
815 /* If the size is a constant and no alignment is specified, force
816 the alignment to be the minimum valid atomic alignment. The
817 restriction on constant size avoids problems with variable-size
818 temporaries; if the size is variable, there's no issue with
819 atomic access. Also don't do this for a constant, since it isn't
820 necessary and can interfere with constant replacement. Finally,
821 do not do it for Out parameters since that creates an
822 size inconsistency with In parameters. */
823 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
824 && !FLOAT_TYPE_P (gnu_type)
825 && !const_flag && No (Renamed_Object (gnat_entity))
826 && !imported_p && No (Address_Clause (gnat_entity))
827 && kind != E_Out_Parameter
828 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
829 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
830 align = MINIMUM_ATOMIC_ALIGNMENT;
833 /* Make a new type with the desired size and alignment, if needed.
834 But do not take into account alignment promotions to compute the
835 size of the object. */
836 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
837 if (gnu_size || align > 0)
838 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
839 false, false, definition,
840 gnu_size ? true : false);
842 /* If this is a renaming, avoid as much as possible to create a new
843 object. However, in several cases, creating it is required.
844 This processing needs to be applied to the raw expression so
845 as to make it more likely to rename the underlying object. */
846 if (Present (Renamed_Object (gnat_entity)))
848 bool create_normal_object = false;
850 /* If the renamed object had padding, strip off the reference
851 to the inner object and reset our type. */
852 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
853 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
854 /* Strip useless conversions around the object. */
855 || (TREE_CODE (gnu_expr) == NOP_EXPR
856 && gnat_types_compatible_p
857 (TREE_TYPE (gnu_expr),
858 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
860 gnu_expr = TREE_OPERAND (gnu_expr, 0);
861 gnu_type = TREE_TYPE (gnu_expr);
864 /* Case 1: If this is a constant renaming stemming from a function
865 call, treat it as a normal object whose initial value is what
866 is being renamed. RM 3.3 says that the result of evaluating a
867 function call is a constant object. As a consequence, it can
868 be the inner object of a constant renaming. In this case, the
869 renaming must be fully instantiated, i.e. it cannot be a mere
870 reference to (part of) an existing object. */
873 tree inner_object = gnu_expr;
874 while (handled_component_p (inner_object))
875 inner_object = TREE_OPERAND (inner_object, 0);
876 if (TREE_CODE (inner_object) == CALL_EXPR)
877 create_normal_object = true;
880 /* Otherwise, see if we can proceed with a stabilized version of
881 the renamed entity or if we need to make a new object. */
882 if (!create_normal_object)
884 tree maybe_stable_expr = NULL_TREE;
887 /* Case 2: If the renaming entity need not be materialized and
888 the renamed expression is something we can stabilize, use
889 that for the renaming. At the global level, we can only do
890 this if we know no SAVE_EXPRs need be made, because the
891 expression we return might be used in arbitrary conditional
892 branches so we must force the SAVE_EXPRs evaluation
893 immediately and this requires a function context. */
894 if (!Materialize_Entity (gnat_entity)
895 && (!global_bindings_p ()
896 || (staticp (gnu_expr)
897 && !TREE_SIDE_EFFECTS (gnu_expr))))
900 = gnat_stabilize_reference (gnu_expr, true, &stable);
904 /* ??? No DECL_EXPR is created so we need to mark
905 the expression manually lest it is shared. */
906 if (global_bindings_p ())
907 MARK_VISITED (maybe_stable_expr);
908 gnu_decl = maybe_stable_expr;
909 save_gnu_tree (gnat_entity, gnu_decl, true);
911 annotate_object (gnat_entity, gnu_type, NULL_TREE,
916 /* The stabilization failed. Keep maybe_stable_expr
917 untouched here to let the pointer case below know
918 about that failure. */
921 /* Case 3: If this is a constant renaming and creating a
922 new object is allowed and cheap, treat it as a normal
923 object whose initial value is what is being renamed. */
925 && !Is_Composite_Type
926 (Underlying_Type (Etype (gnat_entity))))
929 /* Case 4: Make this into a constant pointer to the object we
930 are to rename and attach the object to the pointer if it is
931 something we can stabilize.
933 From the proper scope, attached objects will be referenced
934 directly instead of indirectly via the pointer to avoid
935 subtle aliasing problems with non-addressable entities.
936 They have to be stable because we must not evaluate the
937 variables in the expression every time the renaming is used.
938 The pointer is called a "renaming" pointer in this case.
940 In the rare cases where we cannot stabilize the renamed
941 object, we just make a "bare" pointer, and the renamed
942 entity is always accessed indirectly through it. */
945 gnu_type = build_reference_type (gnu_type);
946 inner_const_flag = TREE_READONLY (gnu_expr);
949 /* If the previous attempt at stabilizing failed, there
950 is no point in trying again and we reuse the result
951 without attaching it to the pointer. In this case it
952 will only be used as the initializing expression of
953 the pointer and thus needs no special treatment with
954 regard to multiple evaluations. */
955 if (maybe_stable_expr)
958 /* Otherwise, try to stabilize and attach the expression
959 to the pointer if the stabilization succeeds.
961 Note that this might introduce SAVE_EXPRs and we don't
962 check whether we're at the global level or not. This
963 is fine since we are building a pointer initializer and
964 neither the pointer nor the initializing expression can
965 be accessed before the pointer elaboration has taken
966 place in a correct program.
968 These SAVE_EXPRs will be evaluated at the right place
969 by either the evaluation of the initializer for the
970 non-global case or the elaboration code for the global
971 case, and will be attached to the elaboration procedure
972 in the latter case. */
976 = gnat_stabilize_reference (gnu_expr, true, &stable);
979 renamed_obj = maybe_stable_expr;
981 /* Attaching is actually performed downstream, as soon
982 as we have a VAR_DECL for the pointer we make. */
985 gnu_expr = build_unary_op (ADDR_EXPR, gnu_type,
988 gnu_size = NULL_TREE;
994 /* Make a volatile version of this object's type if we are to make
995 the object volatile. We also interpret 13.3(19) conservatively
996 and disallow any optimizations for such a non-constant object. */
997 if ((Treat_As_Volatile (gnat_entity)
999 && (Is_Exported (gnat_entity)
1000 || Is_Imported (gnat_entity)
1001 || Present (Address_Clause (gnat_entity)))))
1002 && !TYPE_VOLATILE (gnu_type))
1003 gnu_type = build_qualified_type (gnu_type,
1004 (TYPE_QUALS (gnu_type)
1005 | TYPE_QUAL_VOLATILE));
1007 /* If we are defining an aliased object whose nominal subtype is
1008 unconstrained, the object is a record that contains both the
1009 template and the object. If there is an initializer, it will
1010 have already been converted to the right type, but we need to
1011 create the template if there is no initializer. */
1014 && TREE_CODE (gnu_type) == RECORD_TYPE
1015 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1016 /* Beware that padding might have been introduced above. */
1017 || (TYPE_PADDING_P (gnu_type)
1018 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1020 && TYPE_CONTAINS_TEMPLATE_P
1021 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1024 = TYPE_PADDING_P (gnu_type)
1025 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1026 : TYPE_FIELDS (gnu_type);
1029 = gnat_build_constructor
1033 build_template (TREE_TYPE (template_field),
1034 TREE_TYPE (TREE_CHAIN (template_field)),
1039 /* Convert the expression to the type of the object except in the
1040 case where the object's type is unconstrained or the object's type
1041 is a padded record whose field is of self-referential size. In
1042 the former case, converting will generate unnecessary evaluations
1043 of the CONSTRUCTOR to compute the size and in the latter case, we
1044 want to only copy the actual data. */
1046 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1047 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1048 && !(TYPE_IS_PADDING_P (gnu_type)
1049 && CONTAINS_PLACEHOLDER_P
1050 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1051 gnu_expr = convert (gnu_type, gnu_expr);
1053 /* If this is a pointer and it does not have an initializing
1054 expression, initialize it to NULL, unless the object is
1057 && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type))
1058 && !Is_Imported (gnat_entity) && !gnu_expr)
1059 gnu_expr = integer_zero_node;
1061 /* If we are defining the object and it has an Address clause, we must
1062 either get the address expression from the saved GCC tree for the
1063 object if it has a Freeze node, or elaborate the address expression
1064 here since the front-end has guaranteed that the elaboration has no
1065 effects in this case. */
1066 if (definition && Present (Address_Clause (gnat_entity)))
1069 = present_gnu_tree (gnat_entity)
1070 ? get_gnu_tree (gnat_entity)
1071 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1073 save_gnu_tree (gnat_entity, NULL_TREE, false);
1075 /* Ignore the size. It's either meaningless or was handled
1077 gnu_size = NULL_TREE;
1078 /* Convert the type of the object to a reference type that can
1079 alias everything as per 13.3(19). */
1081 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1082 gnu_address = convert (gnu_type, gnu_address);
1084 const_flag = !Is_Public (gnat_entity)
1085 || compile_time_known_address_p (Expression (Address_Clause
1088 /* If this is a deferred constant, the initializer is attached to
1090 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1093 (Expression (Declaration_Node (Full_View (gnat_entity))));
1095 /* If we don't have an initializing expression for the underlying
1096 variable, the initializing expression for the pointer is the
1097 specified address. Otherwise, we have to make a COMPOUND_EXPR
1098 to assign both the address and the initial value. */
1100 gnu_expr = gnu_address;
1103 = build2 (COMPOUND_EXPR, gnu_type,
1105 (MODIFY_EXPR, NULL_TREE,
1106 build_unary_op (INDIRECT_REF, NULL_TREE,
1112 /* If it has an address clause and we are not defining it, mark it
1113 as an indirect object. Likewise for Stdcall objects that are
1115 if ((!definition && Present (Address_Clause (gnat_entity)))
1116 || (Is_Imported (gnat_entity)
1117 && Has_Stdcall_Convention (gnat_entity)))
1119 /* Convert the type of the object to a reference type that can
1120 alias everything as per 13.3(19). */
1122 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1123 gnu_size = NULL_TREE;
1125 /* No point in taking the address of an initializing expression
1126 that isn't going to be used. */
1127 gnu_expr = NULL_TREE;
1129 /* If it has an address clause whose value is known at compile
1130 time, make the object a CONST_DECL. This will avoid a
1131 useless dereference. */
1132 if (Present (Address_Clause (gnat_entity)))
1134 Node_Id gnat_address
1135 = Expression (Address_Clause (gnat_entity));
1137 if (compile_time_known_address_p (gnat_address))
1139 gnu_expr = gnat_to_gnu (gnat_address);
1147 /* If we are at top level and this object is of variable size,
1148 make the actual type a hidden pointer to the real type and
1149 make the initializer be a memory allocation and initialization.
1150 Likewise for objects we aren't defining (presumed to be
1151 external references from other packages), but there we do
1152 not set up an initialization.
1154 If the object's size overflows, make an allocator too, so that
1155 Storage_Error gets raised. Note that we will never free
1156 such memory, so we presume it never will get allocated. */
1158 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1159 global_bindings_p () || !definition
1162 && ! allocatable_size_p (gnu_size,
1163 global_bindings_p () || !definition
1166 gnu_type = build_reference_type (gnu_type);
1167 gnu_size = NULL_TREE;
1171 /* In case this was a aliased object whose nominal subtype is
1172 unconstrained, the pointer above will be a thin pointer and
1173 build_allocator will automatically make the template.
1175 If we have a template initializer only (that we made above),
1176 pretend there is none and rely on what build_allocator creates
1177 again anyway. Otherwise (if we have a full initializer), get
1178 the data part and feed that to build_allocator.
1180 If we are elaborating a mutable object, tell build_allocator to
1181 ignore a possibly simpler size from the initializer, if any, as
1182 we must allocate the maximum possible size in this case. */
1186 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1188 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1189 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1192 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1194 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1195 && 1 == VEC_length (constructor_elt,
1196 CONSTRUCTOR_ELTS (gnu_expr)))
1200 = build_component_ref
1201 (gnu_expr, NULL_TREE,
1202 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1206 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1207 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1208 && !Is_Imported (gnat_entity))
1209 post_error ("?Storage_Error will be raised at run-time!",
1213 = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1214 Empty, Empty, gnat_entity, mutable_p);
1218 gnu_expr = NULL_TREE;
1223 /* If this object would go into the stack and has an alignment larger
1224 than the largest stack alignment the back-end can honor, resort to
1225 a variable of "aligning type". */
1226 if (!global_bindings_p () && !static_p && definition
1227 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1229 /* Create the new variable. No need for extra room before the
1230 aligned field as this is in automatic storage. */
1232 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1233 TYPE_SIZE_UNIT (gnu_type),
1234 BIGGEST_ALIGNMENT, 0);
1236 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1237 NULL_TREE, gnu_new_type, NULL_TREE, false,
1238 false, false, false, NULL, gnat_entity);
1240 /* Initialize the aligned field if we have an initializer. */
1243 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1245 (gnu_new_var, NULL_TREE,
1246 TYPE_FIELDS (gnu_new_type), false),
1250 /* And setup this entity as a reference to the aligned field. */
1251 gnu_type = build_reference_type (gnu_type);
1254 (ADDR_EXPR, gnu_type,
1255 build_component_ref (gnu_new_var, NULL_TREE,
1256 TYPE_FIELDS (gnu_new_type), false));
1258 gnu_size = NULL_TREE;
1264 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1265 | TYPE_QUAL_CONST));
1267 /* Convert the expression to the type of the object except in the
1268 case where the object's type is unconstrained or the object's type
1269 is a padded record whose field is of self-referential size. In
1270 the former case, converting will generate unnecessary evaluations
1271 of the CONSTRUCTOR to compute the size and in the latter case, we
1272 want to only copy the actual data. */
1274 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1275 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1276 && !(TYPE_IS_PADDING_P (gnu_type)
1277 && CONTAINS_PLACEHOLDER_P
1278 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1279 gnu_expr = convert (gnu_type, gnu_expr);
1281 /* If this name is external or there was a name specified, use it,
1282 unless this is a VMS exception object since this would conflict
1283 with the symbol we need to export in addition. Don't use the
1284 Interface_Name if there is an address clause (see CD30005). */
1285 if (!Is_VMS_Exception (gnat_entity)
1286 && ((Present (Interface_Name (gnat_entity))
1287 && No (Address_Clause (gnat_entity)))
1288 || (Is_Public (gnat_entity)
1289 && (!Is_Imported (gnat_entity)
1290 || Is_Exported (gnat_entity)))))
1291 gnu_ext_name = create_concat_name (gnat_entity, NULL);
1293 /* If this is an aggregate constant initialized to a constant, force it
1294 to be statically allocated. This saves an initialization copy. */
1297 && gnu_expr && TREE_CONSTANT (gnu_expr)
1298 && AGGREGATE_TYPE_P (gnu_type)
1299 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1300 && !(TYPE_IS_PADDING_P (gnu_type)
1301 && !host_integerp (TYPE_SIZE_UNIT
1302 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1306 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1307 gnu_expr, const_flag, Is_Public (gnat_entity),
1308 imported_p || !definition, static_p, attr_list,
1310 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1311 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1312 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1314 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1315 if (global_bindings_p ())
1317 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1318 record_global_renaming_pointer (gnu_decl);
1322 if (definition && DECL_SIZE_UNIT (gnu_decl)
1323 && get_block_jmpbuf_decl ()
1324 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1325 || (flag_stack_check == GENERIC_STACK_CHECK
1326 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1327 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1328 add_stmt_with_node (build_call_1_expr
1329 (update_setjmp_buf_decl,
1330 build_unary_op (ADDR_EXPR, NULL_TREE,
1331 get_block_jmpbuf_decl ())),
1334 /* If we are defining an Out parameter and we're not optimizing,
1335 create a fake PARM_DECL for debugging purposes and make it
1336 point to the VAR_DECL. Suppress debug info for the latter
1337 but make sure it will still live on the stack so it can be
1338 accessed from within the debugger through the PARM_DECL. */
1339 if (kind == E_Out_Parameter && definition && !optimize)
1341 tree param = create_param_decl (gnu_entity_name, gnu_type, false);
1342 gnat_pushdecl (param, gnat_entity);
1343 SET_DECL_VALUE_EXPR (param, gnu_decl);
1344 DECL_HAS_VALUE_EXPR_P (param) = 1;
1346 debug_info_p = false;
1348 DECL_IGNORED_P (param) = 1;
1349 TREE_ADDRESSABLE (gnu_decl) = 1;
1352 /* If this is a public constant or we're not optimizing and we're not
1353 making a VAR_DECL for it, make one just for export or debugger use.
1354 Likewise if the address is taken or if either the object or type is
1355 aliased. Make an external declaration for a reference, unless this
1356 is a Standard entity since there no real symbol at the object level
1358 if (TREE_CODE (gnu_decl) == CONST_DECL
1359 && (definition || Sloc (gnat_entity) > Standard_Location)
1360 && ((Is_Public (gnat_entity) && No (Address_Clause (gnat_entity)))
1362 || Address_Taken (gnat_entity)
1363 || Is_Aliased (gnat_entity)
1364 || Is_Aliased (Etype (gnat_entity))))
1367 = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1368 gnu_expr, true, Is_Public (gnat_entity),
1369 !definition, static_p, attr_list,
1372 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1374 /* As debugging information will be generated for the variable,
1375 do not generate information for the constant. */
1376 DECL_IGNORED_P (gnu_decl) = 1;
1379 /* If this is a constant, even if we don't need a true variable, we
1380 may need to avoid returning the initializer in every case. That
1381 can happen for the address of a (constant) constructor because,
1382 upon dereferencing it, the constructor will be reinjected in the
1383 tree, which may not be valid in every case; see lvalue_required_p
1384 for more details. */
1385 if (TREE_CODE (gnu_decl) == CONST_DECL)
1386 DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr);
1388 /* If this is declared in a block that contains a block with an
1389 exception handler, we must force this variable in memory to
1390 suppress an invalid optimization. */
1391 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1392 && Exception_Mechanism != Back_End_Exceptions)
1393 TREE_ADDRESSABLE (gnu_decl) = 1;
1395 /* Back-annotate Esize and Alignment of the object if not already
1396 known. Note that we pick the values of the type, not those of
1397 the object, to shield ourselves from low-level platform-dependent
1398 adjustments like alignment promotion. This is both consistent with
1399 all the treatment above, where alignment and size are set on the
1400 type of the object and not on the object directly, and makes it
1401 possible to support all confirming representation clauses. */
1402 annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size,
1408 /* Return a TYPE_DECL for "void" that we previously made. */
1409 gnu_decl = TYPE_NAME (void_type_node);
1412 case E_Enumeration_Type:
1413 /* A special case: for the types Character and Wide_Character in
1414 Standard, we do not list all the literals. So if the literals
1415 are not specified, make this an unsigned type. */
1416 if (No (First_Literal (gnat_entity)))
1418 gnu_type = make_unsigned_type (esize);
1419 TYPE_NAME (gnu_type) = gnu_entity_name;
1421 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1422 This is needed by the DWARF-2 back-end to distinguish between
1423 unsigned integer types and character types. */
1424 TYPE_STRING_FLAG (gnu_type) = 1;
1429 /* We have a list of enumeral constants in First_Literal. We make a
1430 CONST_DECL for each one and build into GNU_LITERAL_LIST the list to
1431 be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST
1432 whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the
1433 value of the literal. But when we have a regular boolean type, we
1434 simplify this a little by using a BOOLEAN_TYPE. */
1435 bool is_boolean = Is_Boolean_Type (gnat_entity)
1436 && !Has_Non_Standard_Rep (gnat_entity);
1437 tree gnu_literal_list = NULL_TREE;
1438 Entity_Id gnat_literal;
1440 if (Is_Unsigned_Type (gnat_entity))
1441 gnu_type = make_unsigned_type (esize);
1443 gnu_type = make_signed_type (esize);
1445 TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE);
1447 for (gnat_literal = First_Literal (gnat_entity);
1448 Present (gnat_literal);
1449 gnat_literal = Next_Literal (gnat_literal))
1452 = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type);
1454 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1455 gnu_type, gnu_value, true, false, false,
1456 false, NULL, gnat_literal);
1458 save_gnu_tree (gnat_literal, gnu_literal, false);
1459 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1460 gnu_value, gnu_literal_list);
1464 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1466 /* Note that the bounds are updated at the end of this function
1467 to avoid an infinite recursion since they refer to the type. */
1471 case E_Signed_Integer_Type:
1472 case E_Ordinary_Fixed_Point_Type:
1473 case E_Decimal_Fixed_Point_Type:
1474 /* For integer types, just make a signed type the appropriate number
1476 gnu_type = make_signed_type (esize);
1479 case E_Modular_Integer_Type:
1481 /* For modular types, make the unsigned type of the proper number
1482 of bits and then set up the modulus, if required. */
1483 tree gnu_modulus, gnu_high = NULL_TREE;
1485 /* Packed array types are supposed to be subtypes only. */
1486 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1488 gnu_type = make_unsigned_type (esize);
1490 /* Get the modulus in this type. If it overflows, assume it is because
1491 it is equal to 2**Esize. Note that there is no overflow checking
1492 done on unsigned type, so we detect the overflow by looking for
1493 a modulus of zero, which is otherwise invalid. */
1494 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1496 if (!integer_zerop (gnu_modulus))
1498 TYPE_MODULAR_P (gnu_type) = 1;
1499 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1500 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1501 convert (gnu_type, integer_one_node));
1504 /* If the upper bound is not maximal, make an extra subtype. */
1506 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1508 tree gnu_subtype = make_unsigned_type (esize);
1509 SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high);
1510 TREE_TYPE (gnu_subtype) = gnu_type;
1511 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1512 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1513 gnu_type = gnu_subtype;
1518 case E_Signed_Integer_Subtype:
1519 case E_Enumeration_Subtype:
1520 case E_Modular_Integer_Subtype:
1521 case E_Ordinary_Fixed_Point_Subtype:
1522 case E_Decimal_Fixed_Point_Subtype:
1524 /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
1525 not want to call create_range_type since we would like each subtype
1526 node to be distinct. ??? Historically this was in preparation for
1527 when memory aliasing is implemented, but that's obsolete now given
1528 the call to relate_alias_sets below.
1530 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1531 this fact is used by the arithmetic conversion functions.
1533 We elaborate the Ancestor_Subtype if it is not in the current unit
1534 and one of our bounds is non-static. We do this to ensure consistent
1535 naming in the case where several subtypes share the same bounds, by
1536 elaborating the first such subtype first, thus using its name. */
1539 && Present (Ancestor_Subtype (gnat_entity))
1540 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1541 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1542 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1543 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1545 /* Set the precision to the Esize except for bit-packed arrays. */
1546 if (Is_Packed_Array_Type (gnat_entity)
1547 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1548 esize = UI_To_Int (RM_Size (gnat_entity));
1550 /* This should be an unsigned type if the base type is unsigned or
1551 if the lower bound is constant and non-negative or if the type
1553 if (Is_Unsigned_Type (Etype (gnat_entity))
1554 || Is_Unsigned_Type (gnat_entity)
1555 || Has_Biased_Representation (gnat_entity))
1556 gnu_type = make_unsigned_type (esize);
1558 gnu_type = make_signed_type (esize);
1559 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1561 SET_TYPE_RM_MIN_VALUE
1563 convert (TREE_TYPE (gnu_type),
1564 elaborate_expression (Type_Low_Bound (gnat_entity),
1565 gnat_entity, get_identifier ("L"),
1567 Needs_Debug_Info (gnat_entity))));
1569 SET_TYPE_RM_MAX_VALUE
1571 convert (TREE_TYPE (gnu_type),
1572 elaborate_expression (Type_High_Bound (gnat_entity),
1573 gnat_entity, get_identifier ("U"),
1575 Needs_Debug_Info (gnat_entity))));
1577 /* One of the above calls might have caused us to be elaborated,
1578 so don't blow up if so. */
1579 if (present_gnu_tree (gnat_entity))
1581 maybe_present = true;
1585 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1586 = Has_Biased_Representation (gnat_entity);
1588 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
1589 TYPE_STUB_DECL (gnu_type)
1590 = create_type_stub_decl (gnu_entity_name, gnu_type);
1592 /* Inherit our alias set from what we're a subtype of. Subtypes
1593 are not different types and a pointer can designate any instance
1594 within a subtype hierarchy. */
1595 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1597 /* For a packed array, make the original array type a parallel type. */
1599 && Is_Packed_Array_Type (gnat_entity)
1600 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1601 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1603 (Original_Array_Type (gnat_entity)));
1605 /* We have to handle clauses that under-align the type specially. */
1606 if ((Present (Alignment_Clause (gnat_entity))
1607 || (Is_Packed_Array_Type (gnat_entity)
1609 (Alignment_Clause (Original_Array_Type (gnat_entity)))))
1610 && UI_Is_In_Int_Range (Alignment (gnat_entity)))
1612 align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT;
1613 if (align >= TYPE_ALIGN (gnu_type))
1617 /* If the type we are dealing with represents a bit-packed array,
1618 we need to have the bits left justified on big-endian targets
1619 and right justified on little-endian targets. We also need to
1620 ensure that when the value is read (e.g. for comparison of two
1621 such values), we only get the good bits, since the unused bits
1622 are uninitialized. Both goals are accomplished by wrapping up
1623 the modular type in an enclosing record type. */
1624 if (Is_Packed_Array_Type (gnat_entity)
1625 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1627 tree gnu_field_type, gnu_field;
1629 /* Set the RM size before wrapping up the original type. */
1630 SET_TYPE_RM_SIZE (gnu_type,
1631 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1632 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1634 /* Create a stripped-down declaration, mainly for debugging. */
1635 create_type_decl (gnu_entity_name, gnu_type, NULL, true,
1636 debug_info_p, gnat_entity);
1638 /* Now save it and build the enclosing record type. */
1639 gnu_field_type = gnu_type;
1641 gnu_type = make_node (RECORD_TYPE);
1642 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1643 TYPE_PACKED (gnu_type) = 1;
1644 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
1645 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
1646 SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
1648 /* Propagate the alignment of the modular type to the record type,
1649 unless there is an alignment clause that under-aligns the type.
1650 This means that bit-packed arrays are given "ceil" alignment for
1651 their size by default, which may seem counter-intuitive but makes
1652 it possible to overlay them on modular types easily. */
1653 TYPE_ALIGN (gnu_type)
1654 = align > 0 ? align : TYPE_ALIGN (gnu_field_type);
1656 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1658 /* Don't notify the field as "addressable", since we won't be taking
1659 it's address and it would prevent create_field_decl from making a
1661 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1662 gnu_field_type, gnu_type, 1,
1663 NULL_TREE, bitsize_zero_node, 0);
1665 /* Do not emit debug info until after the parallel type is added. */
1666 finish_record_type (gnu_type, gnu_field, 2, false);
1667 compute_record_mode (gnu_type);
1668 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1672 /* Make the original array type a parallel type. */
1673 if (present_gnu_tree (Original_Array_Type (gnat_entity)))
1674 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1676 (Original_Array_Type (gnat_entity)));
1678 rest_of_record_type_compilation (gnu_type);
1682 /* If the type we are dealing with has got a smaller alignment than the
1683 natural one, we need to wrap it up in a record type and under-align
1684 the latter. We reuse the padding machinery for this purpose. */
1687 tree gnu_field_type, gnu_field;
1689 /* Set the RM size before wrapping up the type. */
1690 SET_TYPE_RM_SIZE (gnu_type,
1691 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1693 /* Create a stripped-down declaration, mainly for debugging. */
1694 create_type_decl (gnu_entity_name, gnu_type, NULL, true,
1695 debug_info_p, gnat_entity);
1697 /* Now save it and build the enclosing record type. */
1698 gnu_field_type = gnu_type;
1700 gnu_type = make_node (RECORD_TYPE);
1701 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1702 TYPE_PACKED (gnu_type) = 1;
1703 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
1704 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
1705 SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
1706 TYPE_ALIGN (gnu_type) = align;
1707 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1709 /* Don't notify the field as "addressable", since we won't be taking
1710 it's address and it would prevent create_field_decl from making a
1712 gnu_field = create_field_decl (get_identifier ("F"),
1713 gnu_field_type, gnu_type, 1,
1714 NULL_TREE, bitsize_zero_node, 0);
1716 finish_record_type (gnu_type, gnu_field, 2, debug_info_p);
1717 compute_record_mode (gnu_type);
1718 TYPE_PADDING_P (gnu_type) = 1;
1723 case E_Floating_Point_Type:
1724 /* If this is a VAX floating-point type, use an integer of the proper
1725 size. All the operations will be handled with ASM statements. */
1726 if (Vax_Float (gnat_entity))
1728 gnu_type = make_signed_type (esize);
1729 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1730 SET_TYPE_DIGITS_VALUE (gnu_type,
1731 UI_To_gnu (Digits_Value (gnat_entity),
1736 /* The type of the Low and High bounds can be our type if this is
1737 a type from Standard, so set them at the end of the function. */
1738 gnu_type = make_node (REAL_TYPE);
1739 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1740 layout_type (gnu_type);
1743 case E_Floating_Point_Subtype:
1744 if (Vax_Float (gnat_entity))
1746 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1752 && Present (Ancestor_Subtype (gnat_entity))
1753 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1754 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1755 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1756 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1759 gnu_type = make_node (REAL_TYPE);
1760 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1761 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1762 TYPE_GCC_MIN_VALUE (gnu_type)
1763 = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type));
1764 TYPE_GCC_MAX_VALUE (gnu_type)
1765 = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type));
1766 layout_type (gnu_type);
1768 SET_TYPE_RM_MIN_VALUE
1770 convert (TREE_TYPE (gnu_type),
1771 elaborate_expression (Type_Low_Bound (gnat_entity),
1772 gnat_entity, get_identifier ("L"),
1774 Needs_Debug_Info (gnat_entity))));
1776 SET_TYPE_RM_MAX_VALUE
1778 convert (TREE_TYPE (gnu_type),
1779 elaborate_expression (Type_High_Bound (gnat_entity),
1780 gnat_entity, get_identifier ("U"),
1782 Needs_Debug_Info (gnat_entity))));
1784 /* One of the above calls might have caused us to be elaborated,
1785 so don't blow up if so. */
1786 if (present_gnu_tree (gnat_entity))
1788 maybe_present = true;
1792 /* Inherit our alias set from what we're a subtype of, as for
1793 integer subtypes. */
1794 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1798 /* Array and String Types and Subtypes
1800 Unconstrained array types are represented by E_Array_Type and
1801 constrained array types are represented by E_Array_Subtype. There
1802 are no actual objects of an unconstrained array type; all we have
1803 are pointers to that type.
1805 The following fields are defined on array types and subtypes:
1807 Component_Type Component type of the array.
1808 Number_Dimensions Number of dimensions (an int).
1809 First_Index Type of first index. */
1814 Entity_Id gnat_index, gnat_name;
1815 const bool convention_fortran_p
1816 = (Convention (gnat_entity) == Convention_Fortran);
1817 const int ndim = Number_Dimensions (gnat_entity);
1818 tree gnu_template_fields = NULL_TREE;
1819 tree gnu_template_type = make_node (RECORD_TYPE);
1820 tree gnu_template_reference;
1821 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1822 tree gnu_fat_type = make_node (RECORD_TYPE);
1823 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
1824 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree));
1825 tree gnu_max_size = size_one_node, gnu_max_size_unit, tem;
1828 TYPE_NAME (gnu_template_type)
1829 = create_concat_name (gnat_entity, "XUB");
1831 /* Make a node for the array. If we are not defining the array
1832 suppress expanding incomplete types. */
1833 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1837 defer_incomplete_level++;
1838 this_deferred = true;
1841 /* Build the fat pointer type. Use a "void *" object instead of
1842 a pointer to the array type since we don't have the array type
1843 yet (it will reference the fat pointer via the bounds). */
1844 tem = chainon (chainon (NULL_TREE,
1845 create_field_decl (get_identifier ("P_ARRAY"),
1848 NULL_TREE, NULL_TREE, 0)),
1849 create_field_decl (get_identifier ("P_BOUNDS"),
1852 NULL_TREE, NULL_TREE, 0));
1854 /* Make sure we can put this into a register. */
1855 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1857 /* Do not emit debug info for this record type since the types of its
1858 fields are still incomplete at this point. */
1859 finish_record_type (gnu_fat_type, tem, 0, false);
1860 TYPE_FAT_POINTER_P (gnu_fat_type) = 1;
1862 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1863 is the fat pointer. This will be used to access the individual
1864 fields once we build them. */
1865 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1866 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1867 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1868 gnu_template_reference
1869 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1870 TREE_READONLY (gnu_template_reference) = 1;
1872 /* Now create the GCC type for each index and add the fields for that
1873 index to the template. */
1874 for (index = (convention_fortran_p ? ndim - 1 : 0),
1875 gnat_index = First_Index (gnat_entity);
1876 0 <= index && index < ndim;
1877 index += (convention_fortran_p ? - 1 : 1),
1878 gnat_index = Next_Index (gnat_index))
1880 char field_name[16];
1881 tree gnu_index_base_type
1882 = get_unpadded_type (Base_Type (Etype (gnat_index)));
1883 tree gnu_low_field, gnu_high_field, gnu_low, gnu_high, gnu_max;
1885 /* Make the FIELD_DECLs for the low and high bounds of this
1886 type and then make extractions of these fields from the
1888 sprintf (field_name, "LB%d", index);
1889 gnu_low_field = create_field_decl (get_identifier (field_name),
1890 gnu_index_base_type,
1891 gnu_template_type, 0,
1892 NULL_TREE, NULL_TREE, 0);
1893 Sloc_to_locus (Sloc (gnat_entity),
1894 &DECL_SOURCE_LOCATION (gnu_low_field));
1896 field_name[0] = 'U';
1897 gnu_high_field = create_field_decl (get_identifier (field_name),
1898 gnu_index_base_type,
1899 gnu_template_type, 0,
1900 NULL_TREE, NULL_TREE, 0);
1901 Sloc_to_locus (Sloc (gnat_entity),
1902 &DECL_SOURCE_LOCATION (gnu_high_field));
1904 gnu_temp_fields[index] = chainon (gnu_low_field, gnu_high_field);
1906 /* We can't use build_component_ref here since the template type
1907 isn't complete yet. */
1908 gnu_low = build3 (COMPONENT_REF, gnu_index_base_type,
1909 gnu_template_reference, gnu_low_field,
1911 gnu_high = build3 (COMPONENT_REF, gnu_index_base_type,
1912 gnu_template_reference, gnu_high_field,
1914 TREE_READONLY (gnu_low) = TREE_READONLY (gnu_high) = 1;
1916 /* Compute the size of this dimension. */
1918 = build3 (COND_EXPR, gnu_index_base_type,
1919 build2 (GE_EXPR, integer_type_node, gnu_high, gnu_low),
1921 build2 (MINUS_EXPR, gnu_index_base_type,
1922 gnu_low, fold_convert (gnu_index_base_type,
1923 integer_one_node)));
1925 /* Make a range type with the new range in the Ada base type.
1926 Then make an index type with the size range in sizetype. */
1927 gnu_index_types[index]
1928 = create_index_type (convert (sizetype, gnu_low),
1929 convert (sizetype, gnu_max),
1930 create_range_type (gnu_index_base_type,
1934 /* Update the maximum size of the array in elements. */
1937 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
1939 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type));
1941 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type));
1943 = size_binop (MAX_EXPR,
1944 size_binop (PLUS_EXPR, size_one_node,
1945 size_binop (MINUS_EXPR,
1949 if (TREE_CODE (gnu_this_max) == INTEGER_CST
1950 && TREE_OVERFLOW (gnu_this_max))
1951 gnu_max_size = NULL_TREE;
1954 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
1957 TYPE_NAME (gnu_index_types[index])
1958 = create_concat_name (gnat_entity, field_name);
1961 for (index = 0; index < ndim; index++)
1963 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1965 /* Install all the fields into the template. */
1966 finish_record_type (gnu_template_type, gnu_template_fields, 0,
1968 TYPE_READONLY (gnu_template_type) = 1;
1970 /* Now make the array of arrays and update the pointer to the array
1971 in the fat pointer. Note that it is the first field. */
1972 tem = gnat_to_gnu_component_type (gnat_entity, definition,
1975 /* If Component_Size is not already specified, annotate it with the
1976 size of the component. */
1977 if (Unknown_Component_Size (gnat_entity))
1978 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1980 /* Compute the maximum size of the array in units and bits. */
1983 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
1984 TYPE_SIZE_UNIT (tem));
1985 gnu_max_size = size_binop (MULT_EXPR,
1986 convert (bitsizetype, gnu_max_size),
1990 gnu_max_size_unit = NULL_TREE;
1992 /* Now build the array type. */
1993 for (index = ndim - 1; index >= 0; index--)
1995 tem = build_array_type (tem, gnu_index_types[index]);
1996 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1997 if (array_type_has_nonaliased_component (tem, gnat_entity))
1998 TYPE_NONALIASED_COMPONENT (tem) = 1;
2001 /* If an alignment is specified, use it if valid. But ignore it
2002 for the original type of packed array types. If the alignment
2003 was requested with an explicit alignment clause, state so. */
2004 if (No (Packed_Array_Type (gnat_entity))
2005 && Known_Alignment (gnat_entity))
2008 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2010 if (Present (Alignment_Clause (gnat_entity)))
2011 TYPE_USER_ALIGN (tem) = 1;
2014 TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p;
2015 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2017 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2018 corresponding fat pointer. */
2019 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2020 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2021 SET_TYPE_MODE (gnu_type, BLKmode);
2022 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2023 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2025 /* If the maximum size doesn't overflow, use it. */
2027 && TREE_CODE (gnu_max_size) == INTEGER_CST
2028 && !TREE_OVERFLOW (gnu_max_size)
2029 && TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2030 && !TREE_OVERFLOW (gnu_max_size_unit))
2032 TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size,
2034 TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit,
2035 TYPE_SIZE_UNIT (tem));
2038 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2039 tem, NULL, !Comes_From_Source (gnat_entity),
2040 debug_info_p, gnat_entity);
2042 /* Give the fat pointer type a name. If this is a packed type, tell
2043 the debugger how to interpret the underlying bits. */
2044 if (Present (Packed_Array_Type (gnat_entity)))
2045 gnat_name = Packed_Array_Type (gnat_entity);
2047 gnat_name = gnat_entity;
2048 create_type_decl (create_concat_name (gnat_name, "XUP"),
2049 gnu_fat_type, NULL, true,
2050 debug_info_p, gnat_entity);
2052 /* Create the type to be used as what a thin pointer designates: an
2053 record type for the object and its template with the field offsets
2054 shifted to have the template at a negative offset. */
2055 tem = build_unc_object_type (gnu_template_type, tem,
2056 create_concat_name (gnat_name, "XUT"));
2057 shift_unc_components_for_thin_pointers (tem);
2059 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2060 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2064 case E_String_Subtype:
2065 case E_Array_Subtype:
2067 /* This is the actual data type for array variables. Multidimensional
2068 arrays are implemented as arrays of arrays. Note that arrays which
2069 have sparse enumeration subtypes as index components create sparse
2070 arrays, which is obviously space inefficient but so much easier to
2073 Also note that the subtype never refers to the unconstrained array
2074 type, which is somewhat at variance with Ada semantics.
2076 First check to see if this is simply a renaming of the array type.
2077 If so, the result is the array type. */
2079 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2080 if (!Is_Constrained (gnat_entity))
2084 Entity_Id gnat_index, gnat_base_index;
2085 const bool convention_fortran_p
2086 = (Convention (gnat_entity) == Convention_Fortran);
2087 const int ndim = Number_Dimensions (gnat_entity);
2088 tree gnu_base_type = gnu_type;
2089 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
2090 tree gnu_max_size = size_one_node, gnu_max_size_unit;
2091 bool need_index_type_struct = false;
2094 /* First create the GCC type for each index and find out whether
2095 special types are needed for debugging information. */
2096 for (index = (convention_fortran_p ? ndim - 1 : 0),
2097 gnat_index = First_Index (gnat_entity),
2099 = First_Index (Implementation_Base_Type (gnat_entity));
2100 0 <= index && index < ndim;
2101 index += (convention_fortran_p ? - 1 : 1),
2102 gnat_index = Next_Index (gnat_index),
2103 gnat_base_index = Next_Index (gnat_base_index))
2105 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
2107 = compare_tree_int (TYPE_RM_SIZE (gnu_index_type),
2108 TYPE_PRECISION (sizetype));
2109 const bool subrange_p = (prec_comp < 0)
2111 && TYPE_UNSIGNED (gnu_index_type)
2112 == TYPE_UNSIGNED (sizetype));
2113 const bool wider_p = (prec_comp > 0);
2114 tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type);
2115 tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type);
2116 tree gnu_min = convert (sizetype, gnu_orig_min);
2117 tree gnu_max = convert (sizetype, gnu_orig_max);
2118 tree gnu_base_index_type
2119 = get_unpadded_type (Etype (gnat_base_index));
2120 tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type);
2121 tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type);
2122 tree gnu_high, gnu_low;
2124 /* See if the base array type is already flat. If it is, we
2125 are probably compiling an ACATS test but it will cause the
2126 code below to malfunction if we don't handle it specially. */
2127 if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST
2128 && TREE_CODE (gnu_base_orig_max) == INTEGER_CST
2129 && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min))
2131 gnu_min = size_one_node;
2132 gnu_max = size_zero_node;
2136 /* Similarly, if one of the values overflows in sizetype and the
2137 range is null, use 1..0 for the sizetype bounds. */
2138 else if (!subrange_p
2139 && TREE_CODE (gnu_min) == INTEGER_CST
2140 && TREE_CODE (gnu_max) == INTEGER_CST
2141 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2142 && tree_int_cst_lt (gnu_orig_max, gnu_orig_min))
2144 gnu_min = size_one_node;
2145 gnu_max = size_zero_node;
2149 /* If the minimum and maximum values both overflow in sizetype,
2150 but the difference in the original type does not overflow in
2151 sizetype, ignore the overflow indication. */
2152 else if (!subrange_p
2153 && TREE_CODE (gnu_min) == INTEGER_CST
2154 && TREE_CODE (gnu_max) == INTEGER_CST
2155 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2158 fold_build2 (MINUS_EXPR, gnu_index_type,
2162 TREE_OVERFLOW (gnu_min) = 0;
2163 TREE_OVERFLOW (gnu_max) = 0;
2167 /* Compute the size of this dimension in the general case. We
2168 need to provide GCC with an upper bound to use but have to
2169 deal with the "superflat" case. There are three ways to do
2170 this. If we can prove that the array can never be superflat,
2171 we can just use the high bound of the index type. */
2172 else if (Nkind (gnat_index) == N_Range
2173 && cannot_be_superflat_p (gnat_index))
2176 /* Otherwise, if we can prove that the low bound minus one and
2177 the high bound cannot overflow, we can just use the expression
2178 MAX (hb, lb - 1). Similarly, if we can prove that the high
2179 bound plus one and the low bound cannot overflow, we can use
2180 the high bound as-is and MIN (hb + 1, lb) for the low bound.
2181 Otherwise, we have to fall back to the most general expression
2182 (hb >= lb) ? hb : lb - 1. Note that the comparison must be
2183 done in the original index type, to avoid any overflow during
2187 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2188 gnu_low = size_binop (PLUS_EXPR, gnu_max, size_one_node);
2190 /* If gnu_high is a constant that has overflowed, the low
2191 bound is the smallest integer so cannot be the maximum.
2192 If gnu_low is a constant that has overflowed, the high
2193 bound is the highest integer so cannot be the minimum. */
2194 if ((TREE_CODE (gnu_high) == INTEGER_CST
2195 && TREE_OVERFLOW (gnu_high))
2196 || (TREE_CODE (gnu_low) == INTEGER_CST
2197 && TREE_OVERFLOW (gnu_low)))
2200 /* If the index type is a subrange and gnu_high a constant
2201 that hasn't overflowed, we can use the maximum. */
2202 else if (subrange_p && TREE_CODE (gnu_high) == INTEGER_CST)
2203 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2205 /* If the index type is a subrange and gnu_low a constant
2206 that hasn't overflowed, we can use the minimum. */
2207 else if (subrange_p && TREE_CODE (gnu_low) == INTEGER_CST)
2210 gnu_min = size_binop (MIN_EXPR, gnu_min, gnu_low);
2215 = build_cond_expr (sizetype,
2216 build_binary_op (GE_EXPR,
2223 gnu_index_types[index]
2224 = create_index_type (gnu_min, gnu_high, gnu_index_type,
2227 /* Update the maximum size of the array in elements. Here we
2228 see if any constraint on the index type of the base type
2229 can be used in the case of self-referential bound on the
2230 index type of the subtype. We look for a non-"infinite"
2231 and non-self-referential bound from any type involved and
2232 handle each bound separately. */
2235 tree gnu_base_min = convert (sizetype, gnu_base_orig_min);
2236 tree gnu_base_max = convert (sizetype, gnu_base_orig_max);
2237 tree gnu_base_index_base_type
2238 = get_base_type (gnu_base_index_type);
2239 tree gnu_base_base_min
2240 = convert (sizetype,
2241 TYPE_MIN_VALUE (gnu_base_index_base_type));
2242 tree gnu_base_base_max
2243 = convert (sizetype,
2244 TYPE_MAX_VALUE (gnu_base_index_base_type));
2246 if (!CONTAINS_PLACEHOLDER_P (gnu_min)
2247 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2248 && !TREE_OVERFLOW (gnu_base_min)))
2249 gnu_base_min = gnu_min;
2251 if (!CONTAINS_PLACEHOLDER_P (gnu_max)
2252 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2253 && !TREE_OVERFLOW (gnu_base_max)))
2254 gnu_base_max = gnu_max;
2256 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2257 && TREE_OVERFLOW (gnu_base_min))
2258 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2259 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2260 && TREE_OVERFLOW (gnu_base_max))
2261 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2262 gnu_max_size = NULL_TREE;
2266 = size_binop (MAX_EXPR,
2267 size_binop (PLUS_EXPR, size_one_node,
2268 size_binop (MINUS_EXPR,
2273 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2274 && TREE_OVERFLOW (gnu_this_max))
2275 gnu_max_size = NULL_TREE;
2278 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2282 /* We need special types for debugging information to point to
2283 the index types if they have variable bounds, are not integer
2284 types, are biased or are wider than sizetype. */
2285 if (!integer_onep (gnu_orig_min)
2286 || TREE_CODE (gnu_orig_max) != INTEGER_CST
2287 || TREE_CODE (gnu_index_type) != INTEGER_TYPE
2288 || (TREE_TYPE (gnu_index_type)
2289 && TREE_CODE (TREE_TYPE (gnu_index_type))
2291 || TYPE_BIASED_REPRESENTATION_P (gnu_index_type)
2293 need_index_type_struct = true;
2296 /* Then flatten: create the array of arrays. For an array type
2297 used to implement a packed array, get the component type from
2298 the original array type since the representation clauses that
2299 can affect it are on the latter. */
2300 if (Is_Packed_Array_Type (gnat_entity)
2301 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2303 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2304 for (index = ndim - 1; index >= 0; index--)
2305 gnu_type = TREE_TYPE (gnu_type);
2307 /* One of the above calls might have caused us to be elaborated,
2308 so don't blow up if so. */
2309 if (present_gnu_tree (gnat_entity))
2311 maybe_present = true;
2317 gnu_type = gnat_to_gnu_component_type (gnat_entity, definition,
2320 /* One of the above calls might have caused us to be elaborated,
2321 so don't blow up if so. */
2322 if (present_gnu_tree (gnat_entity))
2324 maybe_present = true;
2329 /* Compute the maximum size of the array in units and bits. */
2332 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2333 TYPE_SIZE_UNIT (gnu_type));
2334 gnu_max_size = size_binop (MULT_EXPR,
2335 convert (bitsizetype, gnu_max_size),
2336 TYPE_SIZE (gnu_type));
2339 gnu_max_size_unit = NULL_TREE;
2341 /* Now build the array type. */
2342 for (index = ndim - 1; index >= 0; index --)
2344 gnu_type = build_array_type (gnu_type, gnu_index_types[index]);
2345 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2346 if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
2347 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2350 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2351 TYPE_STUB_DECL (gnu_type)
2352 = create_type_stub_decl (gnu_entity_name, gnu_type);
2354 /* If we are at file level and this is a multi-dimensional array,
2355 we need to make a variable corresponding to the stride of the
2356 inner dimensions. */
2357 if (global_bindings_p () && ndim > 1)
2359 tree gnu_str_name = get_identifier ("ST");
2362 for (gnu_arr_type = TREE_TYPE (gnu_type);
2363 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2364 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2365 gnu_str_name = concat_name (gnu_str_name, "ST"))
2367 tree eltype = TREE_TYPE (gnu_arr_type);
2369 TYPE_SIZE (gnu_arr_type)
2370 = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type),
2371 gnat_entity, gnu_str_name,
2374 /* ??? For now, store the size as a multiple of the
2375 alignment of the element type in bytes so that we
2376 can see the alignment from the tree. */
2377 TYPE_SIZE_UNIT (gnu_arr_type)
2379 (MULT_EXPR, sizetype,
2380 elaborate_expression_1
2381 (build_binary_op (EXACT_DIV_EXPR, sizetype,
2382 TYPE_SIZE_UNIT (gnu_arr_type),
2383 size_int (TYPE_ALIGN (eltype)
2385 gnat_entity, concat_name (gnu_str_name, "A_U"),
2387 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2389 /* ??? create_type_decl is not invoked on the inner types so
2390 the MULT_EXPR node built above will never be marked. */
2391 MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type));
2395 /* If we need to write out a record type giving the names of the
2396 bounds for debugging purposes, do it now and make the record
2397 type a parallel type. This is not needed for a packed array
2398 since the bounds are conveyed by the original array type. */
2399 if (need_index_type_struct
2401 && !Is_Packed_Array_Type (gnat_entity))
2403 tree gnu_bound_rec = make_node (RECORD_TYPE);
2404 tree gnu_field_list = NULL_TREE;
2407 TYPE_NAME (gnu_bound_rec)
2408 = create_concat_name (gnat_entity, "XA");
2410 for (index = ndim - 1; index >= 0; index--)
2412 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]);
2413 tree gnu_index_name = TYPE_NAME (gnu_index);
2415 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2416 gnu_index_name = DECL_NAME (gnu_index_name);
2418 /* Make sure to reference the types themselves, and not just
2419 their names, as the debugger may fall back on them. */
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, true);
2428 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2431 /* Otherwise, for a packed array, make the original array type a
2433 else if (debug_info_p
2434 && Is_Packed_Array_Type (gnat_entity)
2435 && present_gnu_tree (Original_Array_Type (gnat_entity)))
2436 add_parallel_type (TYPE_STUB_DECL (gnu_type),
2438 (Original_Array_Type (gnat_entity)));
2440 TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p;
2441 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2442 = (Is_Packed_Array_Type (gnat_entity)
2443 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2445 /* If the size is self-referential and the maximum size doesn't
2446 overflow, use it. */
2447 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2449 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2450 && TREE_OVERFLOW (gnu_max_size))
2451 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2452 && TREE_OVERFLOW (gnu_max_size_unit)))
2454 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2455 TYPE_SIZE (gnu_type));
2456 TYPE_SIZE_UNIT (gnu_type)
2457 = size_binop (MIN_EXPR, gnu_max_size_unit,
2458 TYPE_SIZE_UNIT (gnu_type));
2461 /* Set our alias set to that of our base type. This gives all
2462 array subtypes the same alias set. */
2463 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2465 /* If this is a packed type, make this type the same as the packed
2466 array type, but do some adjusting in the type first. */
2467 if (Present (Packed_Array_Type (gnat_entity)))
2469 Entity_Id gnat_index;
2472 /* First finish the type we had been making so that we output
2473 debugging information for it. */
2474 if (Treat_As_Volatile (gnat_entity))
2476 = build_qualified_type (gnu_type,
2477 TYPE_QUALS (gnu_type)
2478 | TYPE_QUAL_VOLATILE);
2480 /* Make it artificial only if the base type was artificial too.
2481 That's sort of "morally" true and will make it possible for
2482 the debugger to look it up by name in DWARF, which is needed
2483 in order to decode the packed array type. */
2485 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2486 !Comes_From_Source (Etype (gnat_entity))
2487 && !Comes_From_Source (gnat_entity),
2488 debug_info_p, gnat_entity);
2490 /* Save it as our equivalent in case the call below elaborates
2492 save_gnu_tree (gnat_entity, gnu_decl, false);
2494 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2496 this_made_decl = true;
2497 gnu_type = TREE_TYPE (gnu_decl);
2498 save_gnu_tree (gnat_entity, NULL_TREE, false);
2500 gnu_inner = gnu_type;
2501 while (TREE_CODE (gnu_inner) == RECORD_TYPE
2502 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner)
2503 || TYPE_PADDING_P (gnu_inner)))
2504 gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner));
2506 /* We need to attach the index type to the type we just made so
2507 that the actual bounds can later be put into a template. */
2508 if ((TREE_CODE (gnu_inner) == ARRAY_TYPE
2509 && !TYPE_ACTUAL_BOUNDS (gnu_inner))
2510 || (TREE_CODE (gnu_inner) == INTEGER_TYPE
2511 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner)))
2513 if (TREE_CODE (gnu_inner) == INTEGER_TYPE)
2515 /* The TYPE_ACTUAL_BOUNDS field is overloaded with the
2516 TYPE_MODULUS for modular types so we make an extra
2517 subtype if necessary. */
2518 if (TYPE_MODULAR_P (gnu_inner))
2521 = make_unsigned_type (TYPE_PRECISION (gnu_inner));
2522 TREE_TYPE (gnu_subtype) = gnu_inner;
2523 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2524 SET_TYPE_RM_MIN_VALUE (gnu_subtype,
2525 TYPE_MIN_VALUE (gnu_inner));
2526 SET_TYPE_RM_MAX_VALUE (gnu_subtype,
2527 TYPE_MAX_VALUE (gnu_inner));
2528 gnu_inner = gnu_subtype;
2531 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1;
2533 #ifdef ENABLE_CHECKING
2534 /* Check for other cases of overloading. */
2535 gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner));
2539 for (gnat_index = First_Index (gnat_entity);
2540 Present (gnat_index);
2541 gnat_index = Next_Index (gnat_index))
2542 SET_TYPE_ACTUAL_BOUNDS
2544 tree_cons (NULL_TREE,
2545 get_unpadded_type (Etype (gnat_index)),
2546 TYPE_ACTUAL_BOUNDS (gnu_inner)));
2548 if (Convention (gnat_entity) != Convention_Fortran)
2549 SET_TYPE_ACTUAL_BOUNDS
2550 (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner)));
2552 if (TREE_CODE (gnu_type) == RECORD_TYPE
2553 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2554 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner;
2559 /* Abort if packed array with no Packed_Array_Type field set. */
2560 gcc_assert (!Is_Packed (gnat_entity));
2564 case E_String_Literal_Subtype:
2565 /* Create the type for a string literal. */
2567 Entity_Id gnat_full_type
2568 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2569 && Present (Full_View (Etype (gnat_entity)))
2570 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2571 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2572 tree gnu_string_array_type
2573 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2574 tree gnu_string_index_type
2575 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2576 (TYPE_DOMAIN (gnu_string_array_type))));
2577 tree gnu_lower_bound
2578 = convert (gnu_string_index_type,
2579 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2580 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2581 tree gnu_length = ssize_int (length - 1);
2582 tree gnu_upper_bound
2583 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2585 convert (gnu_string_index_type, gnu_length));
2587 = create_index_type (convert (sizetype, gnu_lower_bound),
2588 convert (sizetype, gnu_upper_bound),
2589 create_range_type (gnu_string_index_type,
2595 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2597 if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
2598 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2599 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2603 /* Record Types and Subtypes
2605 The following fields are defined on record types:
2607 Has_Discriminants True if the record has discriminants
2608 First_Discriminant Points to head of list of discriminants
2609 First_Entity Points to head of list of fields
2610 Is_Tagged_Type True if the record is tagged
2612 Implementation of Ada records and discriminated records:
2614 A record type definition is transformed into the equivalent of a C
2615 struct definition. The fields that are the discriminants which are
2616 found in the Full_Type_Declaration node and the elements of the
2617 Component_List found in the Record_Type_Definition node. The
2618 Component_List can be a recursive structure since each Variant of
2619 the Variant_Part of the Component_List has a Component_List.
2621 Processing of a record type definition comprises starting the list of
2622 field declarations here from the discriminants and the calling the
2623 function components_to_record to add the rest of the fields from the
2624 component list and return the gnu type node. The function
2625 components_to_record will call itself recursively as it traverses
2629 if (Has_Complex_Representation (gnat_entity))
2632 = build_complex_type
2634 (Etype (Defining_Entity
2635 (First (Component_Items
2638 (Declaration_Node (gnat_entity)))))))));
2644 Node_Id full_definition = Declaration_Node (gnat_entity);
2645 Node_Id record_definition = Type_Definition (full_definition);
2646 Entity_Id gnat_field;
2647 tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent;
2648 /* Set PACKED in keeping with gnat_to_gnu_field. */
2650 = Is_Packed (gnat_entity)
2652 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2654 : (Known_Alignment (gnat_entity)
2655 || (Strict_Alignment (gnat_entity)
2656 && Known_Static_Esize (gnat_entity)))
2659 bool has_discr = Has_Discriminants (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);
2665 bool is_unchecked_union = Is_Unchecked_Union (gnat_entity);
2667 /* See if all fields have a rep clause. Stop when we find one
2670 for (gnat_field = First_Entity (gnat_entity);
2671 Present (gnat_field);
2672 gnat_field = Next_Entity (gnat_field))
2673 if ((Ekind (gnat_field) == E_Component
2674 || Ekind (gnat_field) == E_Discriminant)
2675 && No (Component_Clause (gnat_field)))
2681 /* If this is a record extension, go a level further to find the
2682 record definition. Also, verify we have a Parent_Subtype. */
2685 if (!type_annotate_only
2686 || Present (Record_Extension_Part (record_definition)))
2687 record_definition = Record_Extension_Part (record_definition);
2689 gcc_assert (type_annotate_only
2690 || Present (Parent_Subtype (gnat_entity)));
2693 /* Make a node for the record. If we are not defining the record,
2694 suppress expanding incomplete types. */
2695 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2696 TYPE_NAME (gnu_type) = gnu_entity_name;
2697 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2701 defer_incomplete_level++;
2702 this_deferred = true;
2705 /* If both a size and rep clause was specified, put the size in
2706 the record type now so that it can get the proper mode. */
2707 if (has_rep && Known_Esize (gnat_entity))
2708 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2710 /* Always set the alignment here so that it can be used to
2711 set the mode, if it is making the alignment stricter. If
2712 it is invalid, it will be checked again below. If this is to
2713 be Atomic, choose a default alignment of a word unless we know
2714 the size and it's smaller. */
2715 if (Known_Alignment (gnat_entity))
2716 TYPE_ALIGN (gnu_type)
2717 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2718 else if (Is_Atomic (gnat_entity))
2719 TYPE_ALIGN (gnu_type)
2720 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2721 /* If a type needs strict alignment, the minimum size will be the
2722 type size instead of the RM size (see validate_size). Cap the
2723 alignment, lest it causes this type size to become too large. */
2724 else if (Strict_Alignment (gnat_entity)
2725 && Known_Static_Esize (gnat_entity))
2727 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2728 unsigned int raw_align = raw_size & -raw_size;
2729 if (raw_align < BIGGEST_ALIGNMENT)
2730 TYPE_ALIGN (gnu_type) = raw_align;
2733 TYPE_ALIGN (gnu_type) = 0;
2735 /* If we have a Parent_Subtype, make a field for the parent. If
2736 this record has rep clauses, force the position to zero. */
2737 if (Present (Parent_Subtype (gnat_entity)))
2739 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2742 /* A major complexity here is that the parent subtype will
2743 reference our discriminants in its Discriminant_Constraint
2744 list. But those must reference the parent component of this
2745 record which is of the parent subtype we have not built yet!
2746 To break the circle we first build a dummy COMPONENT_REF which
2747 represents the "get to the parent" operation and initialize
2748 each of those discriminants to a COMPONENT_REF of the above
2749 dummy parent referencing the corresponding discriminant of the
2750 base type of the parent subtype. */
2751 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2752 build0 (PLACEHOLDER_EXPR, gnu_type),
2753 build_decl (input_location,
2754 FIELD_DECL, NULL_TREE,
2759 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2760 Present (gnat_field);
2761 gnat_field = Next_Stored_Discriminant (gnat_field))
2762 if (Present (Corresponding_Discriminant (gnat_field)))
2765 = gnat_to_gnu_field_decl (Corresponding_Discriminant
2769 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2770 gnu_get_parent, gnu_field, NULL_TREE),
2774 /* Then we build the parent subtype. If it has discriminants but
2775 the type itself has unknown discriminants, this means that it
2776 doesn't contain information about how the discriminants are
2777 derived from those of the ancestor type, so it cannot be used
2778 directly. Instead it is built by cloning the parent subtype
2779 of the underlying record view of the type, for which the above
2780 derivation of discriminants has been made explicit. */
2781 if (Has_Discriminants (gnat_parent)
2782 && Has_Unknown_Discriminants (gnat_entity))
2784 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2786 /* If we are defining the type, the underlying record
2787 view must already have been elaborated at this point.
2788 Otherwise do it now as its parent subtype cannot be
2789 technically elaborated on its own. */
2791 gcc_assert (present_gnu_tree (gnat_uview));
2793 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2795 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2797 /* Substitute the "get to the parent" of the type for that
2798 of its underlying record view in the cloned type. */
2799 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2800 Present (gnat_field);
2801 gnat_field = Next_Stored_Discriminant (gnat_field))
2802 if (Present (Corresponding_Discriminant (gnat_field)))
2804 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2806 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2807 gnu_get_parent, gnu_field, NULL_TREE);
2809 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2813 gnu_parent = gnat_to_gnu_type (gnat_parent);
2815 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2816 initially built. The discriminants must reference the fields
2817 of the parent subtype and not those of its base type for the
2818 placeholder machinery to properly work. */
2821 /* The actual parent subtype is the full view. */
2822 if (IN (Ekind (gnat_parent), Private_Kind))
2824 if (Present (Full_View (gnat_parent)))
2825 gnat_parent = Full_View (gnat_parent);
2827 gnat_parent = Underlying_Full_View (gnat_parent);
2830 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2831 Present (gnat_field);
2832 gnat_field = Next_Stored_Discriminant (gnat_field))
2833 if (Present (Corresponding_Discriminant (gnat_field)))
2835 Entity_Id field = Empty;
2836 for (field = First_Stored_Discriminant (gnat_parent);
2838 field = Next_Stored_Discriminant (field))
2839 if (same_discriminant_p (gnat_field, field))
2841 gcc_assert (Present (field));
2842 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2843 = gnat_to_gnu_field_decl (field);
2847 /* The "get to the parent" COMPONENT_REF must be given its
2849 TREE_TYPE (gnu_get_parent) = gnu_parent;
2851 /* ...and reference the _Parent field of this record. */
2853 = create_field_decl (parent_name_id,
2854 gnu_parent, gnu_type, 0,
2856 ? TYPE_SIZE (gnu_parent) : NULL_TREE,
2858 ? bitsize_zero_node : NULL_TREE, 1);
2859 DECL_INTERNAL_P (gnu_field) = 1;
2860 TREE_OPERAND (gnu_get_parent, 1) = gnu_field;
2861 TYPE_FIELDS (gnu_type) = gnu_field;
2864 /* Make the fields for the discriminants and put them into the record
2865 unless it's an Unchecked_Union. */
2867 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2868 Present (gnat_field);
2869 gnat_field = Next_Stored_Discriminant (gnat_field))
2871 /* If this is a record extension and this discriminant is the
2872 renaming of another discriminant, we've handled it above. */
2873 if (Present (Parent_Subtype (gnat_entity))
2874 && Present (Corresponding_Discriminant (gnat_field)))
2878 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition,
2881 /* Make an expression using a PLACEHOLDER_EXPR from the
2882 FIELD_DECL node just created and link that with the
2883 corresponding GNAT defining identifier. */
2884 save_gnu_tree (gnat_field,
2885 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2886 build0 (PLACEHOLDER_EXPR, gnu_type),
2887 gnu_field, NULL_TREE),
2890 if (!is_unchecked_union)
2892 TREE_CHAIN (gnu_field) = gnu_field_list;
2893 gnu_field_list = gnu_field;
2897 /* Add the fields into the record type and finish it up. */
2898 components_to_record (gnu_type, Component_List (record_definition),
2899 gnu_field_list, packed, definition, NULL,
2900 false, all_rep, is_unchecked_union,
2901 debug_info_p, false);
2903 /* If it is passed by reference, force BLKmode to ensure that objects
2904 + of this type will always be put in memory. */
2905 if (Is_By_Reference_Type (gnat_entity))
2906 SET_TYPE_MODE (gnu_type, BLKmode);
2908 /* We used to remove the associations of the discriminants and _Parent
2909 for validity checking but we may need them if there's a Freeze_Node
2910 for a subtype used in this record. */
2911 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2913 /* Fill in locations of fields. */
2914 annotate_rep (gnat_entity, gnu_type);
2916 /* If there are any entities in the chain corresponding to components
2917 that we did not elaborate, ensure we elaborate their types if they
2919 for (gnat_temp = First_Entity (gnat_entity);
2920 Present (gnat_temp);
2921 gnat_temp = Next_Entity (gnat_temp))
2922 if ((Ekind (gnat_temp) == E_Component
2923 || Ekind (gnat_temp) == E_Discriminant)
2924 && Is_Itype (Etype (gnat_temp))
2925 && !present_gnu_tree (gnat_temp))
2926 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2930 case E_Class_Wide_Subtype:
2931 /* If an equivalent type is present, that is what we should use.
2932 Otherwise, fall through to handle this like a record subtype
2933 since it may have constraints. */
2934 if (gnat_equiv_type != gnat_entity)
2936 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2937 maybe_present = true;
2941 /* ... fall through ... */
2943 case E_Record_Subtype:
2944 /* If Cloned_Subtype is Present it means this record subtype has
2945 identical layout to that type or subtype and we should use
2946 that GCC type for this one. The front end guarantees that
2947 the component list is shared. */
2948 if (Present (Cloned_Subtype (gnat_entity)))
2950 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2952 maybe_present = true;
2956 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2957 changing the type, make a new type with each field having the type of
2958 the field in the new subtype but the position computed by transforming
2959 every discriminant reference according to the constraints. We don't
2960 see any difference between private and non-private type here since
2961 derivations from types should have been deferred until the completion
2962 of the private type. */
2965 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2970 defer_incomplete_level++;
2971 this_deferred = true;
2974 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
2976 if (present_gnu_tree (gnat_entity))
2978 maybe_present = true;
2982 /* When the subtype has discriminants and these discriminants affect
2983 the initial shape it has inherited, factor them in. But for an
2984 Unchecked_Union (it must be an Itype), just return the type.
2985 We can't just test Is_Constrained because private subtypes without
2986 discriminants of types with discriminants with default expressions
2987 are Is_Constrained but aren't constrained! */
2988 if (IN (Ekind (gnat_base_type), Record_Kind)
2989 && !Is_Unchecked_Union (gnat_base_type)
2990 && !Is_For_Access_Subtype (gnat_entity)
2991 && Is_Constrained (gnat_entity)
2992 && Has_Discriminants (gnat_entity)
2993 && Present (Discriminant_Constraint (gnat_entity))
2994 && Stored_Constraint (gnat_entity) != No_Elist)
2997 = build_subst_list (gnat_entity, gnat_base_type, definition);
2998 tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part, t;
2999 tree gnu_variant_list, gnu_pos_list, gnu_field_list = NULL_TREE;
3000 bool selected_variant = false;
3001 Entity_Id gnat_field;
3003 gnu_type = make_node (RECORD_TYPE);
3004 TYPE_NAME (gnu_type) = gnu_entity_name;
3006 /* Set the size, alignment and alias set of the new type to
3007 match that of the old one, doing required substitutions. */
3008 copy_and_substitute_in_size (gnu_type, gnu_base_type,
3011 if (TYPE_IS_PADDING_P (gnu_base_type))
3012 gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3014 gnu_unpad_base_type = gnu_base_type;
3016 /* Look for a REP part in the base type. */
3017 gnu_rep_part = get_rep_part (gnu_unpad_base_type);
3019 /* Look for a variant part in the base type. */
3020 gnu_variant_part = get_variant_part (gnu_unpad_base_type);
3022 /* If there is a variant part, we must compute whether the
3023 constraints statically select a particular variant. If
3024 so, we simply drop the qualified union and flatten the
3025 list of fields. Otherwise we'll build a new qualified
3026 union for the variants that are still relevant. */
3027 if (gnu_variant_part)
3030 = build_variant_list (TREE_TYPE (gnu_variant_part),
3031 gnu_subst_list, NULL_TREE);
3033 /* If all the qualifiers are unconditionally true, the
3034 innermost variant is statically selected. */
3035 selected_variant = true;
3036 for (t = gnu_variant_list; t; t = TREE_CHAIN (t))
3037 if (!integer_onep (TREE_VEC_ELT (TREE_VALUE (t), 1)))
3039 selected_variant = false;
3043 /* Otherwise, create the new variants. */
3044 if (!selected_variant)
3045 for (t = gnu_variant_list; t; t = TREE_CHAIN (t))
3047 tree old_variant = TREE_PURPOSE (t);
3048 tree new_variant = make_node (RECORD_TYPE);
3049 TYPE_NAME (new_variant)
3050 = DECL_NAME (TYPE_NAME (old_variant));
3051 copy_and_substitute_in_size (new_variant, old_variant,
3053 TREE_VEC_ELT (TREE_VALUE (t), 2) = new_variant;
3058 gnu_variant_list = NULL_TREE;
3059 selected_variant = false;
3063 = build_position_list (gnu_unpad_base_type,
3064 gnu_variant_list && !selected_variant,
3065 size_zero_node, bitsize_zero_node,
3066 BIGGEST_ALIGNMENT, NULL_TREE);
3068 for (gnat_field = First_Entity (gnat_entity);
3069 Present (gnat_field);
3070 gnat_field = Next_Entity (gnat_field))
3071 if ((Ekind (gnat_field) == E_Component
3072 || Ekind (gnat_field) == E_Discriminant)
3073 && !(Present (Corresponding_Discriminant (gnat_field))
3074 && Is_Tagged_Type (gnat_base_type))
3075 && Underlying_Type (Scope (Original_Record_Component
3079 Name_Id gnat_name = Chars (gnat_field);
3080 Entity_Id gnat_old_field
3081 = Original_Record_Component (gnat_field);
3083 = gnat_to_gnu_field_decl (gnat_old_field);
3084 tree gnu_context = DECL_CONTEXT (gnu_old_field);
3085 tree gnu_field, gnu_field_type, gnu_size;
3086 tree gnu_cont_type, gnu_last = NULL_TREE;
3088 /* If the type is the same, retrieve the GCC type from the
3089 old field to take into account possible adjustments. */
3090 if (Etype (gnat_field) == Etype (gnat_old_field))
3091 gnu_field_type = TREE_TYPE (gnu_old_field);
3093 gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
3095 /* If there was a component clause, the field types must be
3096 the same for the type and subtype, so copy the data from
3097 the old field to avoid recomputation here. Also if the
3098 field is justified modular and the optimization in
3099 gnat_to_gnu_field was applied. */
3100 if (Present (Component_Clause (gnat_old_field))
3101 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3102 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3103 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3104 == TREE_TYPE (gnu_old_field)))
3106 gnu_size = DECL_SIZE (gnu_old_field);
3107 gnu_field_type = TREE_TYPE (gnu_old_field);
3110 /* If the old field was packed and of constant size, we
3111 have to get the old size here, as it might differ from
3112 what the Etype conveys and the latter might overlap
3113 onto the following field. Try to arrange the type for
3114 possible better packing along the way. */
3115 else if (DECL_PACKED (gnu_old_field)
3116 && TREE_CODE (DECL_SIZE (gnu_old_field))
3119 gnu_size = DECL_SIZE (gnu_old_field);
3120 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3121 && !TYPE_FAT_POINTER_P (gnu_field_type)
3122 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3124 = make_packable_type (gnu_field_type, true);
3128 gnu_size = TYPE_SIZE (gnu_field_type);
3130 /* If the context of the old field is the base type or its
3131 REP part (if any), put the field directly in the new
3132 type; otherwise look up the context in the variant list
3133 and put the field either in the new type if there is a
3134 selected variant or in one of the new variants. */
3135 if (gnu_context == gnu_unpad_base_type
3137 && gnu_context == TREE_TYPE (gnu_rep_part)))
3138 gnu_cont_type = gnu_type;
3141 t = purpose_member (gnu_context, gnu_variant_list);
3144 if (selected_variant)
3145 gnu_cont_type = gnu_type;
3147 gnu_cont_type = TREE_VEC_ELT (TREE_VALUE (t), 2);
3150 /* The front-end may pass us "ghost" components if
3151 it fails to recognize that a constrained subtype
3152 is statically constrained. Discard them. */
3156 /* Now create the new field modeled on the old one. */
3158 = create_field_decl_from (gnu_old_field, gnu_field_type,
3159 gnu_cont_type, gnu_size,
3160 gnu_pos_list, gnu_subst_list);
3162 /* Put it in one of the new variants directly. */
3163 if (gnu_cont_type != gnu_type)
3165 TREE_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type);
3166 TYPE_FIELDS (gnu_cont_type) = gnu_field;
3169 /* To match the layout crafted in components_to_record,
3170 if this is the _Tag or _Parent field, put it before
3171 any other fields. */
3172 else if (gnat_name == Name_uTag
3173 || gnat_name == Name_uParent)
3174 gnu_field_list = chainon (gnu_field_list, gnu_field);
3176 /* Similarly, if this is the _Controller field, put
3177 it before the other fields except for the _Tag or
3179 else if (gnat_name == Name_uController && gnu_last)
3181 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
3182 TREE_CHAIN (gnu_last) = gnu_field;
3185 /* Otherwise, if this is a regular field, put it after
3186 the other fields. */
3189 TREE_CHAIN (gnu_field) = gnu_field_list;
3190 gnu_field_list = gnu_field;
3192 gnu_last = gnu_field;
3195 save_gnu_tree (gnat_field, gnu_field, false);
3198 /* If there is a variant list and no selected variant, we need
3199 to create the nest of variant parts from the old nest. */
3200 if (gnu_variant_list && !selected_variant)
3202 tree new_variant_part
3203 = create_variant_part_from (gnu_variant_part,
3204 gnu_variant_list, gnu_type,
3205 gnu_pos_list, gnu_subst_list);
3206 TREE_CHAIN (new_variant_part) = gnu_field_list;
3207 gnu_field_list = new_variant_part;
3210 /* Now go through the entities again looking for Itypes that
3211 we have not elaborated but should (e.g., Etypes of fields
3212 that have Original_Components). */
3213 for (gnat_field = First_Entity (gnat_entity);
3214 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3215 if ((Ekind (gnat_field) == E_Discriminant
3216 || Ekind (gnat_field) == E_Component)
3217 && !present_gnu_tree (Etype (gnat_field)))
3218 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3220 /* Do not emit debug info for the type yet since we're going to
3222 gnu_field_list = nreverse (gnu_field_list);
3223 finish_record_type (gnu_type, gnu_field_list, 2, false);
3225 /* See the E_Record_Type case for the rationale. */
3226 if (Is_By_Reference_Type (gnat_entity))
3227 SET_TYPE_MODE (gnu_type, BLKmode);
3229 compute_record_mode (gnu_type);
3231 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3233 /* Fill in locations of fields. */
3234 annotate_rep (gnat_entity, gnu_type);
3236 /* If debugging information is being written for the type, write
3237 a record that shows what we are a subtype of and also make a
3238 variable that indicates our size, if still variable. */
3241 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3242 tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type);
3243 tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type);
3245 if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL)
3246 gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name);
3248 TYPE_NAME (gnu_subtype_marker)
3249 = create_concat_name (gnat_entity, "XVS");
3250 finish_record_type (gnu_subtype_marker,
3251 create_field_decl (gnu_unpad_base_name,
3252 build_reference_type
3253 (gnu_unpad_base_type),
3259 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3260 gnu_subtype_marker);
3263 && TREE_CODE (gnu_size_unit) != INTEGER_CST
3264 && !CONTAINS_PLACEHOLDER_P (gnu_size_unit))
3265 create_var_decl (create_concat_name (gnat_entity, "XVZ"),
3266 NULL_TREE, sizetype, gnu_size_unit, false,
3267 false, false, false, NULL, gnat_entity);
3270 /* Now we can finalize it. */
3271 rest_of_record_type_compilation (gnu_type);
3274 /* Otherwise, go down all the components in the new type and make
3275 them equivalent to those in the base type. */
3278 gnu_type = gnu_base_type;
3280 for (gnat_temp = First_Entity (gnat_entity);
3281 Present (gnat_temp);
3282 gnat_temp = Next_Entity (gnat_temp))
3283 if ((Ekind (gnat_temp) == E_Discriminant
3284 && !Is_Unchecked_Union (gnat_base_type))
3285 || Ekind (gnat_temp) == E_Component)
3286 save_gnu_tree (gnat_temp,
3287 gnat_to_gnu_field_decl
3288 (Original_Record_Component (gnat_temp)),
3294 case E_Access_Subprogram_Type:
3295 /* Use the special descriptor type for dispatch tables if needed,
3296 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3297 Note that we are only required to do so for static tables in
3298 order to be compatible with the C++ ABI, but Ada 2005 allows
3299 to extend library level tagged types at the local level so
3300 we do it in the non-static case as well. */
3301 if (TARGET_VTABLE_USES_DESCRIPTORS
3302 && Is_Dispatch_Table_Entity (gnat_entity))
3304 gnu_type = fdesc_type_node;
3305 gnu_size = TYPE_SIZE (gnu_type);
3309 /* ... fall through ... */
3311 case E_Anonymous_Access_Subprogram_Type:
3312 /* If we are not defining this entity, and we have incomplete
3313 entities being processed above us, make a dummy type and
3314 fill it in later. */
3315 if (!definition && defer_incomplete_level != 0)
3317 struct incomplete *p
3318 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3321 = build_pointer_type
3322 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3323 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3324 !Comes_From_Source (gnat_entity),
3325 debug_info_p, gnat_entity);
3326 this_made_decl = true;
3327 gnu_type = TREE_TYPE (gnu_decl);
3328 save_gnu_tree (gnat_entity, gnu_decl, false);
3331 p->old_type = TREE_TYPE (gnu_type);
3332 p->full_type = Directly_Designated_Type (gnat_entity);
3333 p->next = defer_incomplete_list;
3334 defer_incomplete_list = p;
3338 /* ... fall through ... */
3340 case E_Allocator_Type:
3342 case E_Access_Attribute_Type:
3343 case E_Anonymous_Access_Type:
3344 case E_General_Access_Type:
3346 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3347 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3348 bool is_from_limited_with
3349 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3350 && From_With_Type (gnat_desig_equiv));
3352 /* Get the "full view" of this entity. If this is an incomplete
3353 entity from a limited with, treat its non-limited view as the full
3354 view. Otherwise, if this is an incomplete or private type, use the
3355 full view. In the former case, we might point to a private type,
3356 in which case, we need its full view. Also, we want to look at the
3357 actual type used for the representation, so this takes a total of
3359 Entity_Id gnat_desig_full_direct_first
3360 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3361 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3362 ? Full_View (gnat_desig_equiv) : Empty));
3363 Entity_Id gnat_desig_full_direct
3364 = ((is_from_limited_with
3365 && Present (gnat_desig_full_direct_first)
3366 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3367 ? Full_View (gnat_desig_full_direct_first)
3368 : gnat_desig_full_direct_first);
3369 Entity_Id gnat_desig_full
3370 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3372 /* This the type actually used to represent the designated type,
3373 either gnat_desig_full or gnat_desig_equiv. */
3374 Entity_Id gnat_desig_rep;
3376 /* True if this is a pointer to an unconstrained array. */
3377 bool is_unconstrained_array;
3379 /* We want to know if we'll be seeing the freeze node for any
3380 incomplete type we may be pointing to. */
3382 = (Present (gnat_desig_full)
3383 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3384 : In_Extended_Main_Code_Unit (gnat_desig_type));
3386 /* True if we make a dummy type here. */
3387 bool got_fat_p = false;
3388 /* True if the dummy is a fat pointer. */
3389 bool made_dummy = false;
3390 tree gnu_desig_type = NULL_TREE;
3391 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3393 if (!targetm.valid_pointer_mode (p_mode))
3396 /* If either the designated type or its full view is an unconstrained
3397 array subtype, replace it with the type it's a subtype of. This
3398 avoids problems with multiple copies of unconstrained array types.
3399 Likewise, if the designated type is a subtype of an incomplete
3400 record type, use the parent type to avoid order of elaboration
3401 issues. This can lose some code efficiency, but there is no
3403 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3404 && ! Is_Constrained (gnat_desig_equiv))
3405 gnat_desig_equiv = Etype (gnat_desig_equiv);
3406 if (Present (gnat_desig_full)
3407 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3408 && ! Is_Constrained (gnat_desig_full))
3409 || (Ekind (gnat_desig_full) == E_Record_Subtype
3410 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3411 gnat_desig_full = Etype (gnat_desig_full);
3413 /* Now set the type that actually marks the representation of
3414 the designated type and also flag whether we have a unconstrained
3416 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3417 is_unconstrained_array
3418 = (Is_Array_Type (gnat_desig_rep)
3419 && ! Is_Constrained (gnat_desig_rep));
3421 /* If we are pointing to an incomplete type whose completion is an
3422 unconstrained array, make a fat pointer type. The two types in our
3423 fields will be pointers to dummy nodes and will be replaced in
3424 update_pointer_to. Similarly, if the type itself is a dummy type or
3425 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3426 in case we have any thin pointers to it. */
3427 if (is_unconstrained_array
3428 && (Present (gnat_desig_full)
3429 || (present_gnu_tree (gnat_desig_equiv)
3430 && TYPE_IS_DUMMY_P (TREE_TYPE
3431 (get_gnu_tree (gnat_desig_equiv))))
3432 || (No (gnat_desig_full) && ! in_main_unit
3433 && defer_incomplete_level != 0
3434 && ! present_gnu_tree (gnat_desig_equiv))
3435 || (in_main_unit && is_from_limited_with
3436 && Present (Freeze_Node (gnat_desig_rep)))))
3440 if (present_gnu_tree (gnat_desig_rep))
3441 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3444 gnu_old = make_dummy_type (gnat_desig_rep);
3446 /* Show the dummy we get will be a fat pointer. */
3447 got_fat_p = made_dummy = true;
3450 /* If the call above got something that has a pointer, that
3451 pointer is our type. This could have happened either
3452 because the type was elaborated or because somebody
3453 else executed the code below. */
3454 gnu_type = TYPE_POINTER_TO (gnu_old);
3457 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3458 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3459 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3460 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3463 TYPE_NAME (gnu_template_type)
3464 = create_concat_name (gnat_desig_equiv, "XUB");
3465 TYPE_DUMMY_P (gnu_template_type) = 1;
3467 TYPE_NAME (gnu_array_type)
3468 = create_concat_name (gnat_desig_equiv, "XUA");
3469 TYPE_DUMMY_P (gnu_array_type) = 1;
3471 gnu_type = make_node (RECORD_TYPE);
3472 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3473 TYPE_POINTER_TO (gnu_old) = gnu_type;
3476 = chainon (chainon (NULL_TREE,
3478 (get_identifier ("P_ARRAY"),
3480 gnu_type, 0, 0, 0, 0)),
3481 create_field_decl (get_identifier ("P_BOUNDS"),
3483 gnu_type, 0, 0, 0, 0));
3485 /* Make sure we can place this into a register. */
3486 TYPE_ALIGN (gnu_type)
3487 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3488 TYPE_FAT_POINTER_P (gnu_type) = 1;
3490 /* Do not emit debug info for this record type since the types
3491 of its fields are incomplete. */
3492 finish_record_type (gnu_type, fields, 0, false);
3494 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3495 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3496 = create_concat_name (gnat_desig_equiv, "XUT");
3497 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3501 /* If we already know what the full type is, use it. */
3502 else if (Present (gnat_desig_full)
3503 && present_gnu_tree (gnat_desig_full))
3504 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3506 /* Get the type of the thing we are to point to and build a pointer
3507 to it. If it is a reference to an incomplete or private type with a
3508 full view that is a record, make a dummy type node and get the
3509 actual type later when we have verified it is safe. */
3510 else if ((! in_main_unit
3511 && ! present_gnu_tree (gnat_desig_equiv)
3512 && Present (gnat_desig_full)
3513 && ! present_gnu_tree (gnat_desig_full)
3514 && Is_Record_Type (gnat_desig_full))
3515 /* Likewise if we are pointing to a record or array and we
3516 are to defer elaborating incomplete types. We do this
3517 since this access type may be the full view of some
3518 private type. Note that the unconstrained array case is
3520 || ((! in_main_unit || imported_p)
3521 && defer_incomplete_level != 0
3522 && ! present_gnu_tree (gnat_desig_equiv)
3523 && ((Is_Record_Type (gnat_desig_rep)
3524 || Is_Array_Type (gnat_desig_rep))))
3525 /* If this is a reference from a limited_with type back to our
3526 main unit and there's a Freeze_Node for it, either we have
3527 already processed the declaration and made the dummy type,
3528 in which case we just reuse the latter, or we have not yet,
3529 in which case we make the dummy type and it will be reused
3530 when the declaration is processed. In both cases, the
3531 pointer eventually created below will be automatically
3532 adjusted when the Freeze_Node is processed. Note that the
3533 unconstrained array case is handled above. */
3534 || (in_main_unit && is_from_limited_with
3535 && Present (Freeze_Node (gnat_desig_rep))))
3537 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3541 /* Otherwise handle the case of a pointer to itself. */
3542 else if (gnat_desig_equiv == gnat_entity)
3545 = build_pointer_type_for_mode (void_type_node, p_mode,
3546 No_Strict_Aliasing (gnat_entity));
3547 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3550 /* If expansion is disabled, the equivalent type of a concurrent
3551 type is absent, so build a dummy pointer type. */
3552 else if (type_annotate_only && No (gnat_desig_equiv))
3553 gnu_type = ptr_void_type_node;
3555 /* Finally, handle the straightforward case where we can just
3556 elaborate our designated type and point to it. */
3558 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3560 /* It is possible that a call to gnat_to_gnu_type above resolved our
3561 type. If so, just return it. */
3562 if (present_gnu_tree (gnat_entity))
3564 maybe_present = true;
3568 /* If we have a GCC type for the designated type, possibly modify it
3569 if we are pointing only to constant objects and then make a pointer
3570 to it. Don't do this for unconstrained arrays. */
3571 if (!gnu_type && gnu_desig_type)
3573 if (Is_Access_Constant (gnat_entity)
3574 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3577 = build_qualified_type
3579 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3581 /* Some extra processing is required if we are building a
3582 pointer to an incomplete type (in the GCC sense). We might
3583 have such a type if we just made a dummy, or directly out
3584 of the call to gnat_to_gnu_type above if we are processing
3585 an access type for a record component designating the
3586 record type itself. */
3587 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3589 /* We must ensure that the pointer to variant we make will
3590 be processed by update_pointer_to when the initial type
3591 is completed. Pretend we made a dummy and let further
3592 processing act as usual. */
3595 /* We must ensure that update_pointer_to will not retrieve
3596 the dummy variant when building a properly qualified
3597 version of the complete type. We take advantage of the
3598 fact that get_qualified_type is requiring TYPE_NAMEs to
3599 match to influence build_qualified_type and then also
3600 update_pointer_to here. */
3601 TYPE_NAME (gnu_desig_type)
3602 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3607 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3608 No_Strict_Aliasing (gnat_entity));
3611 /* If we are not defining this object and we made a dummy pointer,
3612 save our current definition, evaluate the actual type, and replace
3613 the tentative type we made with the actual one. If we are to defer
3614 actually looking up the actual type, make an entry in the
3615 deferred list. If this is from a limited with, we have to defer
3616 to the end of the current spec in two cases: first if the
3617 designated type is in the current unit and second if the access
3619 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3622 = TYPE_IS_FAT_POINTER_P (gnu_type)
3623 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3625 if (esize == POINTER_SIZE
3626 && (got_fat_p || TYPE_IS_FAT_POINTER_P (gnu_type)))
3628 = build_pointer_type
3629 (TYPE_OBJECT_RECORD_TYPE
3630 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3632 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3633 !Comes_From_Source (gnat_entity),
3634 debug_info_p, gnat_entity);
3635 this_made_decl = true;
3636 gnu_type = TREE_TYPE (gnu_decl);
3637 save_gnu_tree (gnat_entity, gnu_decl, false);
3640 if (defer_incomplete_level == 0
3641 && ! (is_from_limited_with
3643 || In_Extended_Main_Code_Unit (gnat_entity))))
3644 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3645 gnat_to_gnu_type (gnat_desig_equiv));
3647 /* Note that the call to gnat_to_gnu_type here might have
3648 updated gnu_old_type directly, in which case it is not a
3649 dummy type any more when we get into update_pointer_to.
3651 This may happen for instance when the designated type is a
3652 record type, because their elaboration starts with an
3653 initial node from make_dummy_type, which may yield the same
3654 node as the one we got.
3656 Besides, variants of this non-dummy type might have been
3657 created along the way. update_pointer_to is expected to
3658 properly take care of those situations. */
3661 struct incomplete *p
3662 = (struct incomplete *) xmalloc (sizeof
3663 (struct incomplete));
3664 struct incomplete **head
3665 = (is_from_limited_with
3667 || In_Extended_Main_Code_Unit (gnat_entity))
3668 ? &defer_limited_with : &defer_incomplete_list);
3670 p->old_type = gnu_old_type;
3671 p->full_type = gnat_desig_equiv;
3679 case E_Access_Protected_Subprogram_Type:
3680 case E_Anonymous_Access_Protected_Subprogram_Type:
3681 if (type_annotate_only && No (gnat_equiv_type))
3682 gnu_type = ptr_void_type_node;
3685 /* The runtime representation is the equivalent type. */
3686 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3687 maybe_present = true;
3690 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3691 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3692 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3693 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3694 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3699 case E_Access_Subtype:
3701 /* We treat this as identical to its base type; any constraint is
3702 meaningful only to the front end.
3704 The designated type must be elaborated as well, if it does
3705 not have its own freeze node. Designated (sub)types created
3706 for constrained components of records with discriminants are
3707 not frozen by the front end and thus not elaborated by gigi,
3708 because their use may appear before the base type is frozen,
3709 and because it is not clear that they are needed anywhere in
3710 Gigi. With the current model, there is no correct place where
3711 they could be elaborated. */
3713 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3714 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3715 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3716 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3717 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3719 /* If we are not defining this entity, and we have incomplete
3720 entities being processed above us, make a dummy type and
3721 elaborate it later. */
3722 if (!definition && defer_incomplete_level != 0)
3724 struct incomplete *p
3725 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3727 = build_pointer_type
3728 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3730 p->old_type = TREE_TYPE (gnu_ptr_type);
3731 p->full_type = Directly_Designated_Type (gnat_entity);
3732 p->next = defer_incomplete_list;
3733 defer_incomplete_list = p;
3735 else if (!IN (Ekind (Base_Type
3736 (Directly_Designated_Type (gnat_entity))),
3737 Incomplete_Or_Private_Kind))
3738 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3742 maybe_present = true;
3745 /* Subprogram Entities
3747 The following access functions are defined for subprograms (functions
3750 First_Formal The first formal parameter.
3751 Is_Imported Indicates that the subprogram has appeared in
3752 an INTERFACE or IMPORT pragma. For now we
3753 assume that the external language is C.
3754 Is_Exported Likewise but for an EXPORT pragma.
3755 Is_Inlined True if the subprogram is to be inlined.
3757 In addition for function subprograms we have:
3759 Etype Return type of the function.
3761 Each parameter is first checked by calling must_pass_by_ref on its
3762 type to determine if it is passed by reference. For parameters which
3763 are copied in, if they are Ada In Out or Out parameters, their return
3764 value becomes part of a record which becomes the return type of the
3765 function (C function - note that this applies only to Ada procedures
3766 so there is no Ada return type). Additional code to store back the
3767 parameters will be generated on the caller side. This transformation
3768 is done here, not in the front-end.
3770 The intended result of the transformation can be seen from the
3771 equivalent source rewritings that follow:
3773 struct temp {int a,b};
3774 procedure P (A,B: In Out ...) is temp P (int A,B)
3777 end P; return {A,B};
3784 For subprogram types we need to perform mainly the same conversions to
3785 GCC form that are needed for procedures and function declarations. The
3786 only difference is that at the end, we make a type declaration instead
3787 of a function declaration. */
3789 case E_Subprogram_Type:
3793 /* The first GCC parameter declaration (a PARM_DECL node). The
3794 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3795 actually is the head of this parameter list. */
3796 tree gnu_param_list = NULL_TREE;
3797 /* Likewise for the stub associated with an exported procedure. */
3798 tree gnu_stub_param_list = NULL_TREE;
3799 /* The type returned by a function. If the subprogram is a procedure
3800 this type should be void_type_node. */
3801 tree gnu_return_type = void_type_node;
3802 /* List of fields in return type of procedure with copy-in copy-out
3804 tree gnu_field_list = NULL_TREE;
3805 /* Non-null for subprograms containing parameters passed by copy-in
3806 copy-out (Ada In Out or Out parameters not passed by reference),
3807 in which case it is the list of nodes used to specify the values
3808 of the In Out/Out parameters that are returned as a record upon
3809 procedure return. The TREE_PURPOSE of an element of this list is
3810 a field of the record and the TREE_VALUE is the PARM_DECL
3811 corresponding to that field. This list will be saved in the
3812 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3813 tree gnu_cico_list = NULL_TREE;
3814 /* If an import pragma asks to map this subprogram to a GCC builtin,
3815 this is the builtin DECL node. */
3816 tree gnu_builtin_decl = NULL_TREE;
3817 /* For the stub associated with an exported procedure. */
3818 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3819 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3820 Entity_Id gnat_param;
3821 bool inline_flag = Is_Inlined (gnat_entity);
3822 bool public_flag = Is_Public (gnat_entity) || imported_p;
3824 = (Is_Public (gnat_entity) && !definition) || imported_p;
3826 /* The semantics of "pure" in Ada essentially matches that of "const"
3827 in the back-end. In particular, both properties are orthogonal to
3828 the "nothrow" property if the EH circuitry is explicit in the
3829 internal representation of the back-end. If we are to completely
3830 hide the EH circuitry from it, we need to declare that calls to pure
3831 Ada subprograms that can throw have side effects since they can
3832 trigger an "abnormal" transfer of control flow; thus they can be
3833 neither "const" nor "pure" in the back-end sense. */
3835 = (Exception_Mechanism == Back_End_Exceptions
3836 && Is_Pure (gnat_entity));
3838 bool volatile_flag = No_Return (gnat_entity);
3839 bool return_by_direct_ref_p = false;
3840 bool return_by_invisi_ref_p = false;
3841 bool return_unconstrained_p = false;
3842 bool has_copy_in_out = false;
3843 bool has_stub = false;
3846 /* A parameter may refer to this type, so defer completion of any
3847 incomplete types. */
3848 if (kind == E_Subprogram_Type && !definition)
3850 defer_incomplete_level++;
3851 this_deferred = true;
3854 /* If the subprogram has an alias, it is probably inherited, so
3855 we can use the original one. If the original "subprogram"
3856 is actually an enumeration literal, it may be the first use
3857 of its type, so we must elaborate that type now. */
3858 if (Present (Alias (gnat_entity)))
3860 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3861 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3863 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3866 /* Elaborate any Itypes in the parameters of this entity. */
3867 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3868 Present (gnat_temp);
3869 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3870 if (Is_Itype (Etype (gnat_temp)))
3871 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3876 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3877 corresponding DECL node.
3879 We still want the parameter associations to take place because the
3880 proper generation of calls depends on it (a GNAT parameter without
3881 a corresponding GCC tree has a very specific meaning), so we don't
3883 if (Convention (gnat_entity) == Convention_Intrinsic)
3884 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3886 /* ??? What if we don't find the builtin node above ? warn ? err ?
3887 In the current state we neither warn nor err, and calls will just
3888 be handled as for regular subprograms. */
3890 if (kind == E_Function || kind == E_Subprogram_Type)
3891 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3893 /* If this function returns by reference, make the actual return
3894 type of this function the pointer and mark the decl. */
3895 if (Returns_By_Ref (gnat_entity))
3897 gnu_return_type = build_pointer_type (gnu_return_type);
3898 return_by_direct_ref_p = true;
3901 /* If the Mechanism is By_Reference, ensure this function uses the
3902 target's by-invisible-reference mechanism, which may not be the
3903 same as above (e.g. it might be passing an extra parameter).
3905 Prior to GCC 4, this was handled by just setting TREE_ADDRESSABLE
3906 on the result type. Everything required to pass by invisible
3907 reference using the target's mechanism (e.g. an extra parameter)
3908 was handled at RTL expansion time.
3910 This doesn't work with GCC 4 any more for several reasons. First,
3911 the gimplification process might need to create temporaries of this
3912 type and the gimplifier ICEs on such attempts; that's why the flag
3913 is now set on the function type instead. Second, the middle-end
3914 now also relies on a different attribute, DECL_BY_REFERENCE on the
3915 RESULT_DECL, and expects the by-invisible-reference-ness to be made
3916 explicit in the function body. */
3917 else if (kind == E_Function && Mechanism (gnat_entity) == By_Reference)
3918 return_by_invisi_ref_p = true;
3920 /* If we are supposed to return an unconstrained array, actually return
3921 a fat pointer and make a note of that. */
3922 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3924 gnu_return_type = TREE_TYPE (gnu_return_type);
3925 return_unconstrained_p = true;
3928 /* If the type requires a transient scope, the result is allocated
3929 on the secondary stack, so the result type of the function is
3931 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3933 gnu_return_type = build_pointer_type (gnu_return_type);
3934 return_unconstrained_p = true;
3937 /* If the type is a padded type and the underlying type would not
3938 be passed by reference or this function has a foreign convention,
3939 return the underlying type. */
3940 else if (TYPE_IS_PADDING_P (gnu_return_type)
3941 && (!default_pass_by_ref (TREE_TYPE
3942 (TYPE_FIELDS (gnu_return_type)))
3943 || Has_Foreign_Convention (gnat_entity)))
3944 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3946 /* If the return type is unconstrained, that means it must have a
3947 maximum size. Use the padded type as the effective return type.
3948 And ensure the function uses the target's by-invisible-reference
3949 mechanism to avoid copying too much data when it returns. */
3950 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type)))
3953 = maybe_pad_type (gnu_return_type,
3954 max_size (TYPE_SIZE (gnu_return_type), true),
3955 0, gnat_entity, false, false, false, true);
3956 return_by_invisi_ref_p = true;
3959 /* If the return type has a size that overflows, we cannot have
3960 a function that returns that type. This usage doesn't make
3961 sense anyway, so give an error here. */
3962 if (TYPE_SIZE_UNIT (gnu_return_type)
3963 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3964 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3966 post_error ("cannot return type whose size overflows",
3968 gnu_return_type = copy_node (gnu_return_type);
3969 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3970 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3971 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3972 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3975 /* Look at all our parameters and get the type of
3976 each. While doing this, build a copy-out structure if
3979 /* Loop over the parameters and get their associated GCC tree.
3980 While doing this, build a copy-out structure if we need one. */
3981 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
3982 Present (gnat_param);
3983 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3985 tree gnu_param_name = get_entity_name (gnat_param);
3986 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3987 tree gnu_param, gnu_field;
3988 bool copy_in_copy_out = false;
3989 Mechanism_Type mech = Mechanism (gnat_param);
3991 /* Builtins are expanded inline and there is no real call sequence
3992 involved. So the type expected by the underlying expander is
3993 always the type of each argument "as is". */
3994 if (gnu_builtin_decl)
3996 /* Handle the first parameter of a valued procedure specially. */
3997 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3998 mech = By_Copy_Return;
3999 /* Otherwise, see if a Mechanism was supplied that forced this
4000 parameter to be passed one way or another. */
4001 else if (mech == Default
4002 || mech == By_Copy || mech == By_Reference)
4004 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4005 mech = By_Descriptor;
4007 else if (By_Short_Descriptor_Last <= mech &&
4008 mech <= By_Short_Descriptor)
4009 mech = By_Short_Descriptor;
4013 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4014 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4015 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4017 mech = By_Reference;
4023 post_error ("unsupported mechanism for&", gnat_param);
4028 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4029 Has_Foreign_Convention (gnat_entity),
4032 /* We are returned either a PARM_DECL or a type if no parameter
4033 needs to be passed; in either case, adjust the type. */
4034 if (DECL_P (gnu_param))
4035 gnu_param_type = TREE_TYPE (gnu_param);
4038 gnu_param_type = gnu_param;
4039 gnu_param = NULL_TREE;
4044 /* If it's an exported subprogram, we build a parameter list
4045 in parallel, in case we need to emit a stub for it. */
4046 if (Is_Exported (gnat_entity))
4049 = chainon (gnu_param, gnu_stub_param_list);
4050 /* Change By_Descriptor parameter to By_Reference for
4051 the internal version of an exported subprogram. */
4052 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4055 = gnat_to_gnu_param (gnat_param, By_Reference,
4061 gnu_param = copy_node (gnu_param);
4064 gnu_param_list = chainon (gnu_param, gnu_param_list);
4065 Sloc_to_locus (Sloc (gnat_param),
4066 &DECL_SOURCE_LOCATION (gnu_param));
4067 save_gnu_tree (gnat_param, gnu_param, false);
4069 /* If a parameter is a pointer, this function may modify
4070 memory through it and thus shouldn't be considered
4071 a const function. Also, the memory may be modified
4072 between two calls, so they can't be CSE'ed. The latter
4073 case also handles by-ref parameters. */
4074 if (POINTER_TYPE_P (gnu_param_type)
4075 || TYPE_IS_FAT_POINTER_P (gnu_param_type))
4079 if (copy_in_copy_out)
4081 if (!has_copy_in_out)
4083 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4084 gnu_return_type = make_node (RECORD_TYPE);
4085 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4086 /* Set a default alignment to speed up accesses. */
4087 TYPE_ALIGN (gnu_return_type)
4088 = get_mode_alignment (ptr_mode);
4089 has_copy_in_out = true;
4092 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4093 gnu_return_type, 0, 0, 0, 0);
4094 Sloc_to_locus (Sloc (gnat_param),
4095 &DECL_SOURCE_LOCATION (gnu_field));
4096 TREE_CHAIN (gnu_field) = gnu_field_list;
4097 gnu_field_list = gnu_field;
4099 = tree_cons (gnu_field, gnu_param, gnu_cico_list);
4103 /* Do not compute record for out parameters if subprogram is
4104 stubbed since structures are incomplete for the back-end. */
4105 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4106 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4109 /* If we have a CICO list but it has only one entry, we convert
4110 this function into a function that simply returns that one
4112 if (list_length (gnu_cico_list) == 1)
4113 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list));
4115 if (Has_Stdcall_Convention (gnat_entity))
4116 prepend_one_attribute_to
4117 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4118 get_identifier ("stdcall"), NULL_TREE,
4121 /* If we are on a target where stack realignment is needed for 'main'
4122 to honor GCC's implicit expectations (stack alignment greater than
4123 what the base ABI guarantees), ensure we do the same for foreign
4124 convention subprograms as they might be used as callbacks from code
4125 breaking such expectations. Note that this applies to task entry
4126 points in particular. */
4127 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4128 && Has_Foreign_Convention (gnat_entity))
4129 prepend_one_attribute_to
4130 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4131 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4134 /* The lists have been built in reverse. */
4135 gnu_param_list = nreverse (gnu_param_list);
4137 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4138 gnu_cico_list = nreverse (gnu_cico_list);
4140 if (Ekind (gnat_entity) == E_Function)
4141 Set_Mechanism (gnat_entity, return_unconstrained_p
4142 || return_by_direct_ref_p
4143 || return_by_invisi_ref_p
4144 ? By_Reference : By_Copy);
4146 = create_subprog_type (gnu_return_type, gnu_param_list,
4147 gnu_cico_list, return_unconstrained_p,
4148 return_by_direct_ref_p,
4149 return_by_invisi_ref_p);
4153 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4154 gnu_cico_list, return_unconstrained_p,
4155 return_by_direct_ref_p,
4156 return_by_invisi_ref_p);
4158 /* A subprogram (something that doesn't return anything) shouldn't
4159 be considered const since there would be no reason for such a
4160 subprogram. Note that procedures with Out (or In Out) parameters
4161 have already been converted into a function with a return type. */
4162 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4166 = build_qualified_type (gnu_type,
4167 TYPE_QUALS (gnu_type)
4168 | (TYPE_QUAL_CONST * const_flag)
4169 | (TYPE_QUAL_VOLATILE * volatile_flag));
4173 = build_qualified_type (gnu_stub_type,
4174 TYPE_QUALS (gnu_stub_type)
4175 | (TYPE_QUAL_CONST * const_flag)
4176 | (TYPE_QUAL_VOLATILE * volatile_flag));
4178 /* If we have a builtin decl for that function, check the signatures
4179 compatibilities. If the signatures are compatible, use the builtin
4180 decl. If they are not, we expect the checker predicate to have
4181 posted the appropriate errors, and just continue with what we have
4183 if (gnu_builtin_decl)
4185 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4187 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4189 gnu_decl = gnu_builtin_decl;
4190 gnu_type = gnu_builtin_type;
4195 /* If there was no specified Interface_Name and the external and
4196 internal names of the subprogram are the same, only use the
4197 internal name to allow disambiguation of nested subprograms. */
4198 if (No (Interface_Name (gnat_entity))
4199 && gnu_ext_name == gnu_entity_name)
4200 gnu_ext_name = NULL_TREE;
4202 /* If we are defining the subprogram and it has an Address clause
4203 we must get the address expression from the saved GCC tree for the
4204 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4205 the address expression here since the front-end has guaranteed
4206 in that case that the elaboration has no effects. If there is
4207 an Address clause and we are not defining the object, just
4208 make it a constant. */
4209 if (Present (Address_Clause (gnat_entity)))
4211 tree gnu_address = NULL_TREE;
4215 = (present_gnu_tree (gnat_entity)
4216 ? get_gnu_tree (gnat_entity)
4217 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4219 save_gnu_tree (gnat_entity, NULL_TREE, false);
4221 /* Convert the type of the object to a reference type that can
4222 alias everything as per 13.3(19). */
4224 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4226 gnu_address = convert (gnu_type, gnu_address);
4229 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4230 gnu_address, false, Is_Public (gnat_entity),
4231 extern_flag, false, NULL, gnat_entity);
4232 DECL_BY_REF_P (gnu_decl) = 1;
4235 else if (kind == E_Subprogram_Type)
4236 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4237 !Comes_From_Source (gnat_entity),
4238 debug_info_p, gnat_entity);
4243 gnu_stub_name = gnu_ext_name;
4244 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4245 public_flag = false;
4248 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4249 gnu_type, gnu_param_list,
4250 inline_flag, public_flag,
4251 extern_flag, attr_list,
4256 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4257 gnu_stub_type, gnu_stub_param_list,
4259 extern_flag, attr_list,
4261 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4264 /* This is unrelated to the stub built right above. */
4265 DECL_STUBBED_P (gnu_decl)
4266 = Convention (gnat_entity) == Convention_Stubbed;
4271 case E_Incomplete_Type:
4272 case E_Incomplete_Subtype:
4273 case E_Private_Type:
4274 case E_Private_Subtype:
4275 case E_Limited_Private_Type:
4276 case E_Limited_Private_Subtype:
4277 case E_Record_Type_With_Private:
4278 case E_Record_Subtype_With_Private:
4280 /* Get the "full view" of this entity. If this is an incomplete
4281 entity from a limited with, treat its non-limited view as the
4282 full view. Otherwise, use either the full view or the underlying
4283 full view, whichever is present. This is used in all the tests
4286 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4287 && From_With_Type (gnat_entity))
4288 ? Non_Limited_View (gnat_entity)
4289 : Present (Full_View (gnat_entity))
4290 ? Full_View (gnat_entity)
4291 : Underlying_Full_View (gnat_entity);
4293 /* If this is an incomplete type with no full view, it must be a Taft
4294 Amendment type, in which case we return a dummy type. Otherwise,
4295 just get the type from its Etype. */
4298 if (kind == E_Incomplete_Type)
4300 gnu_type = make_dummy_type (gnat_entity);
4301 gnu_decl = TYPE_STUB_DECL (gnu_type);
4305 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4307 maybe_present = true;
4312 /* If we already made a type for the full view, reuse it. */
4313 else if (present_gnu_tree (full_view))
4315 gnu_decl = get_gnu_tree (full_view);
4319 /* Otherwise, if we are not defining the type now, get the type
4320 from the full view. But always get the type from the full view
4321 for define on use types, since otherwise we won't see them! */
4322 else if (!definition
4323 || (Is_Itype (full_view)
4324 && No (Freeze_Node (gnat_entity)))
4325 || (Is_Itype (gnat_entity)
4326 && No (Freeze_Node (full_view))))
4328 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4329 maybe_present = true;
4333 /* For incomplete types, make a dummy type entry which will be
4334 replaced later. Save it as the full declaration's type so
4335 we can do any needed updates when we see it. */
4336 gnu_type = make_dummy_type (gnat_entity);
4337 gnu_decl = TYPE_STUB_DECL (gnu_type);
4338 save_gnu_tree (full_view, gnu_decl, 0);
4342 case E_Class_Wide_Type:
4343 /* Class-wide types are always transformed into their root type. */
4344 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4345 maybe_present = true;
4349 case E_Task_Subtype:
4350 case E_Protected_Type:
4351 case E_Protected_Subtype:
4352 if (type_annotate_only && No (gnat_equiv_type))
4353 gnu_type = void_type_node;
4355 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4357 maybe_present = true;
4361 gnu_decl = create_label_decl (gnu_entity_name);
4366 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4367 we've already saved it, so we don't try to. */
4368 gnu_decl = error_mark_node;
4376 /* If we had a case where we evaluated another type and it might have
4377 defined this one, handle it here. */
4378 if (maybe_present && present_gnu_tree (gnat_entity))
4380 gnu_decl = get_gnu_tree (gnat_entity);
4384 /* If we are processing a type and there is either no decl for it or
4385 we just made one, do some common processing for the type, such as
4386 handling alignment and possible padding. */
4387 if (is_type && (!gnu_decl || this_made_decl))
4389 /* Tell the middle-end that objects of tagged types are guaranteed to
4390 be properly aligned. This is necessary because conversions to the
4391 class-wide type are translated into conversions to the root type,
4392 which can be less aligned than some of its derived types. */
4393 if (Is_Tagged_Type (gnat_entity)
4394 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4395 TYPE_ALIGN_OK (gnu_type) = 1;
4397 /* If the type is passed by reference, objects of this type must be
4398 fully addressable and cannot be copied. */
4399 if (Is_By_Reference_Type (gnat_entity))
4400 TREE_ADDRESSABLE (gnu_type) = 1;
4402 /* ??? Don't set the size for a String_Literal since it is either
4403 confirming or we don't handle it properly (if the low bound is
4405 if (!gnu_size && kind != E_String_Literal_Subtype)
4406 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4408 Has_Size_Clause (gnat_entity));
4410 /* If a size was specified, see if we can make a new type of that size
4411 by rearranging the type, for example from a fat to a thin pointer. */
4415 = make_type_from_size (gnu_type, gnu_size,
4416 Has_Biased_Representation (gnat_entity));
4418 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4419 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4423 /* If the alignment hasn't already been processed and this is
4424 not an unconstrained array, see if an alignment is specified.
4425 If not, we pick a default alignment for atomic objects. */
4426 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4428 else if (Known_Alignment (gnat_entity))
4430 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4431 TYPE_ALIGN (gnu_type));
4433 /* Warn on suspiciously large alignments. This should catch
4434 errors about the (alignment,byte)/(size,bit) discrepancy. */
4435 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4439 /* If a size was specified, take it into account. Otherwise
4440 use the RM size for records as the type size has already
4441 been adjusted to the alignment. */
4444 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4445 || TREE_CODE (gnu_type) == UNION_TYPE
4446 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4447 && !TYPE_FAT_POINTER_P (gnu_type))
4448 size = rm_size (gnu_type);
4450 size = TYPE_SIZE (gnu_type);
4452 /* Consider an alignment as suspicious if the alignment/size
4453 ratio is greater or equal to the byte/bit ratio. */
4454 if (host_integerp (size, 1)
4455 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4456 post_error_ne ("?suspiciously large alignment specified for&",
4457 Expression (Alignment_Clause (gnat_entity)),
4461 else if (Is_Atomic (gnat_entity) && !gnu_size
4462 && host_integerp (TYPE_SIZE (gnu_type), 1)
4463 && integer_pow2p (TYPE_SIZE (gnu_type)))
4464 align = MIN (BIGGEST_ALIGNMENT,
4465 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4466 else if (Is_Atomic (gnat_entity) && gnu_size
4467 && host_integerp (gnu_size, 1)
4468 && integer_pow2p (gnu_size))
4469 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4471 /* See if we need to pad the type. If we did, and made a record,
4472 the name of the new type may be changed. So get it back for
4473 us when we make the new TYPE_DECL below. */
4474 if (gnu_size || align > 0)
4475 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4476 false, !gnu_decl, definition, false);
4478 if (TYPE_IS_PADDING_P (gnu_type))
4480 gnu_entity_name = TYPE_NAME (gnu_type);
4481 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4482 gnu_entity_name = DECL_NAME (gnu_entity_name);
4485 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4487 /* If we are at global level, GCC will have applied variable_size to
4488 the type, but that won't have done anything. So, if it's not
4489 a constant or self-referential, call elaborate_expression_1 to
4490 make a variable for the size rather than calculating it each time.
4491 Handle both the RM size and the actual size. */
4492 if (global_bindings_p ()
4493 && TYPE_SIZE (gnu_type)
4494 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4495 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4497 if (TREE_CODE (gnu_type) == RECORD_TYPE
4498 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4499 TYPE_SIZE (gnu_type), 0))
4501 TYPE_SIZE (gnu_type)
4502 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4503 gnat_entity, get_identifier ("SIZE"),
4505 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4509 TYPE_SIZE (gnu_type)
4510 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4511 gnat_entity, get_identifier ("SIZE"),
4514 /* ??? For now, store the size as a multiple of the alignment
4515 in bytes so that we can see the alignment from the tree. */
4516 TYPE_SIZE_UNIT (gnu_type)
4518 (MULT_EXPR, sizetype,
4519 elaborate_expression_1
4520 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4521 TYPE_SIZE_UNIT (gnu_type),
4522 size_int (TYPE_ALIGN (gnu_type)
4524 gnat_entity, get_identifier ("SIZE_A_UNIT"),
4526 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4528 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4531 elaborate_expression_1 (TYPE_ADA_SIZE (gnu_type),
4533 get_identifier ("RM_SIZE"),
4534 definition, false));
4538 /* If this is a record type or subtype, call elaborate_expression_1 on
4539 any field position. Do this for both global and local types.
4540 Skip any fields that we haven't made trees for to avoid problems with
4541 class wide types. */
4542 if (IN (kind, Record_Kind))
4543 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4544 gnat_temp = Next_Entity (gnat_temp))
4545 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4547 tree gnu_field = get_gnu_tree (gnat_temp);
4549 /* ??? Unfortunately, GCC needs to be able to prove the
4550 alignment of this offset and if it's a variable, it can't.
4551 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4552 right now, we have to put in an explicit multiply and
4553 divide by that value. */
4554 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4556 DECL_FIELD_OFFSET (gnu_field)
4558 (MULT_EXPR, sizetype,
4559 elaborate_expression_1
4560 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4561 DECL_FIELD_OFFSET (gnu_field),
4562 size_int (DECL_OFFSET_ALIGN (gnu_field)
4564 gnat_temp, get_identifier ("OFFSET"),
4566 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4568 /* ??? The context of gnu_field is not necessarily gnu_type so
4569 the MULT_EXPR node built above may not be marked by the call
4570 to create_type_decl below. */
4571 if (global_bindings_p ())
4572 MARK_VISITED (DECL_FIELD_OFFSET (gnu_field));
4576 if (Treat_As_Volatile (gnat_entity))
4578 = build_qualified_type (gnu_type,
4579 TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
4581 if (Is_Atomic (gnat_entity))
4582 check_ok_for_atomic (gnu_type, gnat_entity, false);
4584 if (Present (Alignment_Clause (gnat_entity)))
4585 TYPE_USER_ALIGN (gnu_type) = 1;
4587 if (Universal_Aliasing (gnat_entity))
4588 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4591 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4592 !Comes_From_Source (gnat_entity),
4593 debug_info_p, gnat_entity);
4596 TREE_TYPE (gnu_decl) = gnu_type;
4597 TYPE_STUB_DECL (gnu_type) = gnu_decl;
4601 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4603 gnu_type = TREE_TYPE (gnu_decl);
4605 /* If this is a derived type, relate its alias set to that of its parent
4606 to avoid troubles when a call to an inherited primitive is inlined in
4607 a context where a derived object is accessed. The inlined code works
4608 on the parent view so the resulting code may access the same object
4609 using both the parent and the derived alias sets, which thus have to
4610 conflict. As the same issue arises with component references, the
4611 parent alias set also has to conflict with composite types enclosing
4612 derived components. For instance, if we have:
4619 we want T to conflict with both D and R, in addition to R being a
4620 superset of D by record/component construction.
4622 One way to achieve this is to perform an alias set copy from the
4623 parent to the derived type. This is not quite appropriate, though,
4624 as we don't want separate derived types to conflict with each other:
4626 type I1 is new Integer;
4627 type I2 is new Integer;
4629 We want I1 and I2 to both conflict with Integer but we do not want
4630 I1 to conflict with I2, and an alias set copy on derivation would
4633 The option chosen is to make the alias set of the derived type a
4634 superset of that of its parent type. It trivially fulfills the
4635 simple requirement for the Integer derivation example above, and
4636 the component case as well by superset transitivity:
4639 R ----------> D ----------> T
4641 However, for composite types, conversions between derived types are
4642 translated into VIEW_CONVERT_EXPRs so a sequence like:
4644 type Comp1 is new Comp;
4645 type Comp2 is new Comp;
4646 procedure Proc (C : Comp1);
4654 Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C));
4656 and gimplified into:
4663 i.e. generates code involving type punning. Therefore, Comp1 needs
4664 to conflict with Comp2 and an alias set copy is required.
4666 The language rules ensure the parent type is already frozen here. */
4667 if (Is_Derived_Type (gnat_entity))
4669 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4670 relate_alias_sets (gnu_type, gnu_parent_type,
4671 Is_Composite_Type (gnat_entity)
4672 ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET);
4675 /* Back-annotate the Alignment of the type if not already in the
4676 tree. Likewise for sizes. */
4677 if (Unknown_Alignment (gnat_entity))
4679 unsigned int double_align, align;
4680 bool is_capped_double, align_clause;
4682 /* If the default alignment of "double" or larger scalar types is
4683 specifically capped and this is not an array with an alignment
4684 clause on the component type, return the cap. */
4685 if ((double_align = double_float_alignment) > 0)
4687 = is_double_float_or_array (gnat_entity, &align_clause);
4688 else if ((double_align = double_scalar_alignment) > 0)
4690 = is_double_scalar_or_array (gnat_entity, &align_clause);
4692 is_capped_double = align_clause = false;
4694 if (is_capped_double && !align_clause)
4695 align = double_align;
4697 align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
4699 Set_Alignment (gnat_entity, UI_From_Int (align));
4702 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4704 tree gnu_size = TYPE_SIZE (gnu_type);
4706 /* If the size is self-referential, annotate the maximum value. */
4707 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4708 gnu_size = max_size (gnu_size, true);
4710 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4712 /* In this mode, the tag and the parent components are not
4713 generated by the front-end so the sizes must be adjusted. */
4714 tree pointer_size = bitsize_int (POINTER_SIZE), offset;
4717 if (Is_Derived_Type (gnat_entity))
4719 offset = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
4721 Set_Alignment (gnat_entity,
4722 Alignment (Etype (Base_Type (gnat_entity))));
4725 offset = pointer_size;
4727 gnu_size = size_binop (PLUS_EXPR, gnu_size, offset);
4728 gnu_size = size_binop (MULT_EXPR, pointer_size,
4729 size_binop (CEIL_DIV_EXPR,
4732 uint_size = annotate_value (gnu_size);
4733 Set_Esize (gnat_entity, uint_size);
4734 Set_RM_Size (gnat_entity, uint_size);
4737 Set_Esize (gnat_entity, annotate_value (gnu_size));
4740 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4741 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4744 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4745 DECL_ARTIFICIAL (gnu_decl) = 1;
4747 if (!debug_info_p && DECL_P (gnu_decl)
4748 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4749 && No (Renamed_Object (gnat_entity)))
4750 DECL_IGNORED_P (gnu_decl) = 1;
4752 /* If we haven't already, associate the ..._DECL node that we just made with
4753 the input GNAT entity node. */
4755 save_gnu_tree (gnat_entity, gnu_decl, false);
4757 /* If this is an enumeration or floating-point type, we were not able to set
4758 the bounds since they refer to the type. These are always static. */
4759 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4760 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4762 tree gnu_scalar_type = gnu_type;
4763 tree gnu_low_bound, gnu_high_bound;
4765 /* If this is a padded type, we need to use the underlying type. */
4766 if (TYPE_IS_PADDING_P (gnu_scalar_type))
4767 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4769 /* If this is a floating point type and we haven't set a floating
4770 point type yet, use this in the evaluation of the bounds. */
4771 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4772 longest_float_type_node = gnu_scalar_type;
4774 gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4775 gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity));
4777 if (kind == E_Enumeration_Type)
4779 /* Enumeration types have specific RM bounds. */
4780 SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound);
4781 SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound);
4783 /* Write full debugging information. Since this has both a
4784 typedef and a tag, avoid outputting the name twice. */
4785 DECL_ARTIFICIAL (gnu_decl) = 1;
4786 rest_of_type_decl_compilation (gnu_decl);
4791 /* Floating-point types don't have specific RM bounds. */
4792 TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound;
4793 TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound;
4797 /* If we deferred processing of incomplete types, re-enable it. If there
4798 were no other disables and we have some to process, do so. */
4799 if (this_deferred && --defer_incomplete_level == 0)
4801 if (defer_incomplete_list)
4803 struct incomplete *incp, *next;
4805 /* We are back to level 0 for the deferring of incomplete types.
4806 But processing these incomplete types below may itself require
4807 deferring, so preserve what we have and restart from scratch. */
4808 incp = defer_incomplete_list;
4809 defer_incomplete_list = NULL;
4811 /* For finalization, however, all types must be complete so we
4812 cannot do the same because deferred incomplete types may end up
4813 referencing each other. Process them all recursively first. */
4814 defer_finalize_level++;
4816 for (; incp; incp = next)
4821 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4822 gnat_to_gnu_type (incp->full_type));
4826 defer_finalize_level--;
4829 /* All the deferred incomplete types have been processed so we can
4830 now proceed with the finalization of the deferred types. */
4831 if (defer_finalize_level == 0 && defer_finalize_list)
4836 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4837 rest_of_type_decl_compilation_no_defer (t);
4839 VEC_free (tree, heap, defer_finalize_list);
4843 /* If we are not defining this type, see if it's in the incomplete list.
4844 If so, handle that list entry now. */
4845 else if (!definition)
4847 struct incomplete *incp;
4849 for (incp = defer_incomplete_list; incp; incp = incp->next)
4850 if (incp->old_type && incp->full_type == gnat_entity)
4852 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4853 TREE_TYPE (gnu_decl));
4854 incp->old_type = NULL_TREE;
4861 /* If this is a packed array type whose original array type is itself
4862 an Itype without freeze node, make sure the latter is processed. */
4863 if (Is_Packed_Array_Type (gnat_entity)
4864 && Is_Itype (Original_Array_Type (gnat_entity))
4865 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4866 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4867 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4872 /* Similar, but if the returned value is a COMPONENT_REF, return the
4876 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4878 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4880 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4881 gnu_field = TREE_OPERAND (gnu_field, 1);
4886 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4887 the GCC type corresponding to that entity. */
4890 gnat_to_gnu_type (Entity_Id gnat_entity)
4894 /* The back end never attempts to annotate generic types. */
4895 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4896 return void_type_node;
4898 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4899 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4901 return TREE_TYPE (gnu_decl);
4904 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4905 the unpadded version of the GCC type corresponding to that entity. */
4908 get_unpadded_type (Entity_Id gnat_entity)
4910 tree type = gnat_to_gnu_type (gnat_entity);
4912 if (TYPE_IS_PADDING_P (type))
4913 type = TREE_TYPE (TYPE_FIELDS (type));
4918 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4919 Every TYPE_DECL generated for a type definition must be passed
4920 to this function once everything else has been done for it. */
4923 rest_of_type_decl_compilation (tree decl)
4925 /* We need to defer finalizing the type if incomplete types
4926 are being deferred or if they are being processed. */
4927 if (defer_incomplete_level || defer_finalize_level)
4928 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4930 rest_of_type_decl_compilation_no_defer (decl);
4933 /* Same as above but without deferring the compilation. This
4934 function should not be invoked directly on a TYPE_DECL. */
4937 rest_of_type_decl_compilation_no_defer (tree decl)
4939 const int toplev = global_bindings_p ();
4940 tree t = TREE_TYPE (decl);
4942 rest_of_decl_compilation (decl, toplev, 0);
4944 /* Now process all the variants. This is needed for STABS. */
4945 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4947 if (t == TREE_TYPE (decl))
4950 if (!TYPE_STUB_DECL (t))
4951 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4953 rest_of_type_compilation (t, toplev);
4957 /* Finalize any From_With_Type incomplete types. We do this after processing
4958 our compilation unit and after processing its spec, if this is a body. */
4961 finalize_from_with_types (void)
4963 struct incomplete *incp = defer_limited_with;
4964 struct incomplete *next;
4966 defer_limited_with = 0;
4967 for (; incp; incp = next)
4971 if (incp->old_type != 0)
4972 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4973 gnat_to_gnu_type (incp->full_type));
4978 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4979 kind of type (such E_Task_Type) that has a different type which Gigi
4980 uses for its representation. If the type does not have a special type
4981 for its representation, return GNAT_ENTITY. If a type is supposed to
4982 exist, but does not, abort unless annotating types, in which case
4983 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4986 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4988 Entity_Id gnat_equiv = gnat_entity;
4990 if (No (gnat_entity))
4993 switch (Ekind (gnat_entity))
4995 case E_Class_Wide_Subtype:
4996 if (Present (Equivalent_Type (gnat_entity)))
4997 gnat_equiv = Equivalent_Type (gnat_entity);
5000 case E_Access_Protected_Subprogram_Type:
5001 case E_Anonymous_Access_Protected_Subprogram_Type:
5002 gnat_equiv = Equivalent_Type (gnat_entity);
5005 case E_Class_Wide_Type:
5006 gnat_equiv = Root_Type (gnat_entity);
5010 case E_Task_Subtype:
5011 case E_Protected_Type:
5012 case E_Protected_Subtype:
5013 gnat_equiv = Corresponding_Record_Type (gnat_entity);
5020 gcc_assert (Present (gnat_equiv) || type_annotate_only);
5024 /* Return a GCC tree for a type corresponding to the component type of the
5025 array type or subtype GNAT_ARRAY. DEFINITION is true if this component
5026 is for an array being defined. DEBUG_INFO_P is true if we need to write
5027 debug information for other types that we may create in the process. */
5030 gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition,
5033 tree gnu_type = gnat_to_gnu_type (Component_Type (gnat_array));
5036 /* Try to get a smaller form of the component if needed. */
5037 if ((Is_Packed (gnat_array)
5038 || Has_Component_Size_Clause (gnat_array))
5039 && !Is_Bit_Packed_Array (gnat_array)
5040 && !Has_Aliased_Components (gnat_array)
5041 && !Strict_Alignment (Component_Type (gnat_array))
5042 && TREE_CODE (gnu_type) == RECORD_TYPE
5043 && !TYPE_FAT_POINTER_P (gnu_type)
5044 && host_integerp (TYPE_SIZE (gnu_type), 1))
5045 gnu_type = make_packable_type (gnu_type, false);
5047 if (Has_Atomic_Components (gnat_array))
5048 check_ok_for_atomic (gnu_type, gnat_array, true);
5050 /* Get and validate any specified Component_Size. */
5052 = validate_size (Component_Size (gnat_array), gnu_type, gnat_array,
5053 Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL,
5054 true, Has_Component_Size_Clause (gnat_array));
5056 /* If the array has aliased components and the component size can be zero,
5057 force at least unit size to ensure that the components have distinct
5060 && Has_Aliased_Components (gnat_array)
5061 && (integer_zerop (TYPE_SIZE (gnu_type))
5062 || (TREE_CODE (gnu_type) == ARRAY_TYPE
5063 && !TREE_CONSTANT (TYPE_SIZE (gnu_type)))))
5065 = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node);
5067 /* If the component type is a RECORD_TYPE that has a self-referential size,
5068 then use the maximum size for the component size. */
5070 && TREE_CODE (gnu_type) == RECORD_TYPE
5071 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
5072 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
5074 /* Honor the component size. This is not needed for bit-packed arrays. */
5075 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array))
5077 tree orig_type = gnu_type;
5078 unsigned int max_align;
5080 /* If an alignment is specified, use it as a cap on the component type
5081 so that it can be honored for the whole type. But ignore it for the
5082 original type of packed array types. */
5083 if (No (Packed_Array_Type (gnat_array)) && Known_Alignment (gnat_array))
5084 max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0);
5088 gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false);
5089 if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
5090 gnu_type = orig_type;
5092 orig_type = gnu_type;
5094 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array,
5095 true, false, definition, true);
5097 /* If a padding record was made, declare it now since it will never be
5098 declared otherwise. This is necessary to ensure that its subtrees
5099 are properly marked. */
5100 if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type)))
5101 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true,
5102 debug_info_p, gnat_array);
5105 if (Has_Volatile_Components (Base_Type (gnat_array)))
5107 = build_qualified_type (gnu_type,
5108 TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
5113 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
5114 using MECH as its passing mechanism, to be placed in the parameter
5115 list built for GNAT_SUBPROG. Assume a foreign convention for the
5116 latter if FOREIGN is true. Also set CICO to true if the parameter
5117 must use the copy-in copy-out implementation mechanism.
5119 The returned tree is a PARM_DECL, except for those cases where no
5120 parameter needs to be actually passed to the subprogram; the type
5121 of this "shadow" parameter is then returned instead. */
5124 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
5125 Entity_Id gnat_subprog, bool foreign, bool *cico)
5127 tree gnu_param_name = get_entity_name (gnat_param);
5128 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
5129 tree gnu_param_type_alt = NULL_TREE;
5130 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
5131 /* The parameter can be indirectly modified if its address is taken. */
5132 bool ro_param = in_param && !Address_Taken (gnat_param);
5133 bool by_return = false, by_component_ptr = false, by_ref = false;
5136 /* Copy-return is used only for the first parameter of a valued procedure.
5137 It's a copy mechanism for which a parameter is never allocated. */
5138 if (mech == By_Copy_Return)
5140 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5145 /* If this is either a foreign function or if the underlying type won't
5146 be passed by reference, strip off possible padding type. */
5147 if (TYPE_IS_PADDING_P (gnu_param_type))
5149 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5151 if (mech == By_Reference
5153 || (!must_pass_by_ref (unpadded_type)
5154 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5155 gnu_param_type = unpadded_type;
5158 /* If this is a read-only parameter, make a variant of the type that is
5159 read-only. ??? However, if this is an unconstrained array, that type
5160 can be very complex, so skip it for now. Likewise for any other
5161 self-referential type. */
5163 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5164 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5165 gnu_param_type = build_qualified_type (gnu_param_type,
5166 (TYPE_QUALS (gnu_param_type)
5167 | TYPE_QUAL_CONST));
5169 /* For foreign conventions, pass arrays as pointers to the element type.
5170 First check for unconstrained array and get the underlying array. */
5171 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5173 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5175 /* VMS descriptors are themselves passed by reference. */
5176 if (mech == By_Short_Descriptor ||
5177 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5179 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5180 Mechanism (gnat_param),
5182 else if (mech == By_Descriptor)
5184 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5185 chosen in fill_vms_descriptor. */
5187 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5188 Mechanism (gnat_param),
5191 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5192 Mechanism (gnat_param),
5196 /* Arrays are passed as pointers to element type for foreign conventions. */
5199 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5201 /* Strip off any multi-dimensional entries, then strip
5202 off the last array to get the component type. */
5203 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5204 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5205 gnu_param_type = TREE_TYPE (gnu_param_type);
5207 by_component_ptr = true;
5208 gnu_param_type = TREE_TYPE (gnu_param_type);
5211 gnu_param_type = build_qualified_type (gnu_param_type,
5212 (TYPE_QUALS (gnu_param_type)
5213 | TYPE_QUAL_CONST));
5215 gnu_param_type = build_pointer_type (gnu_param_type);
5218 /* Fat pointers are passed as thin pointers for foreign conventions. */
5219 else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type))
5221 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5223 /* If we must pass or were requested to pass by reference, do so.
5224 If we were requested to pass by copy, do so.
5225 Otherwise, for foreign conventions, pass In Out or Out parameters
5226 or aggregates by reference. For COBOL and Fortran, pass all
5227 integer and FP types that way too. For Convention Ada, use
5228 the standard Ada default. */
5229 else if (must_pass_by_ref (gnu_param_type)
5230 || mech == By_Reference
5233 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5235 && (Convention (gnat_subprog) == Convention_Fortran
5236 || Convention (gnat_subprog) == Convention_COBOL)
5237 && (INTEGRAL_TYPE_P (gnu_param_type)
5238 || FLOAT_TYPE_P (gnu_param_type)))
5240 && default_pass_by_ref (gnu_param_type)))))
5242 gnu_param_type = build_reference_type (gnu_param_type);
5246 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5250 if (mech == By_Copy && (by_ref || by_component_ptr))
5251 post_error ("?cannot pass & by copy", gnat_param);
5253 /* If this is an Out parameter that isn't passed by reference and isn't
5254 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5255 it will be a VAR_DECL created when we process the procedure, so just
5256 return its type. For the special parameter of a valued procedure,
5259 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5260 Out parameters with discriminants or implicit initial values to be
5261 handled like In Out parameters. These type are normally built as
5262 aggregates, hence passed by reference, except for some packed arrays
5263 which end up encoded in special integer types.
5265 The exception we need to make is then for packed arrays of records
5266 with discriminants or implicit initial values. We have no light/easy
5267 way to check for the latter case, so we merely check for packed arrays
5268 of records. This may lead to useless copy-in operations, but in very
5269 rare cases only, as these would be exceptions in a set of already
5270 exceptional situations. */
5271 if (Ekind (gnat_param) == E_Out_Parameter
5274 || (mech != By_Descriptor
5275 && mech != By_Short_Descriptor
5276 && !POINTER_TYPE_P (gnu_param_type)
5277 && !AGGREGATE_TYPE_P (gnu_param_type)))
5278 && !(Is_Array_Type (Etype (gnat_param))
5279 && Is_Packed (Etype (gnat_param))
5280 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5281 return gnu_param_type;
5283 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5284 ro_param || by_ref || by_component_ptr);
5285 DECL_BY_REF_P (gnu_param) = by_ref;
5286 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5287 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5288 mech == By_Short_Descriptor);
5289 DECL_POINTS_TO_READONLY_P (gnu_param)
5290 = (ro_param && (by_ref || by_component_ptr));
5292 /* Save the alternate descriptor type, if any. */
5293 if (gnu_param_type_alt)
5294 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5296 /* If no Mechanism was specified, indicate what we're using, then
5297 back-annotate it. */
5298 if (mech == Default)
5299 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5301 Set_Mechanism (gnat_param, mech);
5305 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5308 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5310 while (Present (Corresponding_Discriminant (discr1)))
5311 discr1 = Corresponding_Discriminant (discr1);
5313 while (Present (Corresponding_Discriminant (discr2)))
5314 discr2 = Corresponding_Discriminant (discr2);
5317 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5320 /* Return true if the array type GNU_TYPE, which represents a dimension of
5321 GNAT_TYPE, has a non-aliased component in the back-end sense. */
5324 array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type)
5326 /* If the array type is not the innermost dimension of the GNAT type,
5327 then it has a non-aliased component. */
5328 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5329 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5332 /* If the array type has an aliased component in the front-end sense,
5333 then it also has an aliased component in the back-end sense. */
5334 if (Has_Aliased_Components (gnat_type))
5337 /* If this is a derived type, then it has a non-aliased component if
5338 and only if its parent type also has one. */
5339 if (Is_Derived_Type (gnat_type))
5341 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type));
5343 if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE)
5345 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type))));
5346 for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--)
5347 gnu_parent_type = TREE_TYPE (gnu_parent_type);
5348 return TYPE_NONALIASED_COMPONENT (gnu_parent_type);
5351 /* Otherwise, rely exclusively on properties of the element type. */
5352 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5355 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5358 compile_time_known_address_p (Node_Id gnat_address)
5360 /* Catch System'To_Address. */
5361 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5362 gnat_address = Expression (gnat_address);
5364 return Compile_Time_Known_Value (gnat_address);
5367 /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the
5368 inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */
5371 cannot_be_superflat_p (Node_Id gnat_range)
5373 Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range);
5374 Node_Id scalar_range;
5375 tree gnu_lb, gnu_hb;
5377 /* If the low bound is not constant, try to find an upper bound. */
5378 while (Nkind (gnat_lb) != N_Integer_Literal
5379 && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype
5380 || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype)
5381 && (scalar_range = Scalar_Range (Etype (gnat_lb)))
5382 && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
5383 || Nkind (scalar_range) == N_Range))
5384 gnat_lb = High_Bound (scalar_range);
5386 /* If the high bound is not constant, try to find a lower bound. */
5387 while (Nkind (gnat_hb) != N_Integer_Literal
5388 && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype
5389 || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype)
5390 && (scalar_range = Scalar_Range (Etype (gnat_hb)))
5391 && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
5392 || Nkind (scalar_range) == N_Range))
5393 gnat_hb = Low_Bound (scalar_range);
5395 if (!(Nkind (gnat_lb) == N_Integer_Literal
5396 && Nkind (gnat_hb) == N_Integer_Literal))
5399 gnu_lb = UI_To_gnu (Intval (gnat_lb), bitsizetype);
5400 gnu_hb = UI_To_gnu (Intval (gnat_hb), bitsizetype);
5402 /* If the low bound is the smallest integer, nothing can be smaller. */
5403 gnu_lb = size_binop (MINUS_EXPR, gnu_lb, bitsize_one_node);
5404 if (TREE_OVERFLOW (gnu_lb))
5407 return (tree_int_cst_lt (gnu_hb, gnu_lb) == 0);
5410 /* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */
5413 constructor_address_p (tree gnu_expr)
5415 while (TREE_CODE (gnu_expr) == NOP_EXPR
5416 || TREE_CODE (gnu_expr) == CONVERT_EXPR
5417 || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR)
5418 gnu_expr = TREE_OPERAND (gnu_expr, 0);
5420 return (TREE_CODE (gnu_expr) == ADDR_EXPR
5421 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR);
5424 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5425 be elaborated at the point of its definition, but do nothing else. */
5428 elaborate_entity (Entity_Id gnat_entity)
5430 switch (Ekind (gnat_entity))
5432 case E_Signed_Integer_Subtype:
5433 case E_Modular_Integer_Subtype:
5434 case E_Enumeration_Subtype:
5435 case E_Ordinary_Fixed_Point_Subtype:
5436 case E_Decimal_Fixed_Point_Subtype:
5437 case E_Floating_Point_Subtype:
5439 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5440 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5442 /* ??? Tests to avoid Constraint_Error in static expressions
5443 are needed until after the front stops generating bogus
5444 conversions on bounds of real types. */
5445 if (!Raises_Constraint_Error (gnat_lb))
5446 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5447 true, false, Needs_Debug_Info (gnat_entity));
5448 if (!Raises_Constraint_Error (gnat_hb))
5449 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5450 true, false, Needs_Debug_Info (gnat_entity));
5456 Node_Id full_definition = Declaration_Node (gnat_entity);
5457 Node_Id record_definition = Type_Definition (full_definition);
5459 /* If this is a record extension, go a level further to find the
5460 record definition. */
5461 if (Nkind (record_definition) == N_Derived_Type_Definition)
5462 record_definition = Record_Extension_Part (record_definition);
5466 case E_Record_Subtype:
5467 case E_Private_Subtype:
5468 case E_Limited_Private_Subtype:
5469 case E_Record_Subtype_With_Private:
5470 if (Is_Constrained (gnat_entity)
5471 && Has_Discriminants (gnat_entity)
5472 && Present (Discriminant_Constraint (gnat_entity)))
5474 Node_Id gnat_discriminant_expr;
5475 Entity_Id gnat_field;
5478 = First_Discriminant (Implementation_Base_Type (gnat_entity)),
5479 gnat_discriminant_expr
5480 = First_Elmt (Discriminant_Constraint (gnat_entity));
5481 Present (gnat_field);
5482 gnat_field = Next_Discriminant (gnat_field),
5483 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5484 /* ??? For now, ignore access discriminants. */
5485 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5486 elaborate_expression (Node (gnat_discriminant_expr),
5487 gnat_entity, get_entity_name (gnat_field),
5488 true, false, false);
5495 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5496 any entities on its entity chain similarly. */
5499 mark_out_of_scope (Entity_Id gnat_entity)
5501 Entity_Id gnat_sub_entity;
5502 unsigned int kind = Ekind (gnat_entity);
5504 /* If this has an entity list, process all in the list. */
5505 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5506 || IN (kind, Private_Kind)
5507 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5508 || kind == E_Function || kind == E_Generic_Function
5509 || kind == E_Generic_Package || kind == E_Generic_Procedure
5510 || kind == E_Loop || kind == E_Operator || kind == E_Package
5511 || kind == E_Package_Body || kind == E_Procedure
5512 || kind == E_Record_Type || kind == E_Record_Subtype
5513 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5514 for (gnat_sub_entity = First_Entity (gnat_entity);
5515 Present (gnat_sub_entity);
5516 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5517 if (Scope (gnat_sub_entity) == gnat_entity
5518 && gnat_sub_entity != gnat_entity)
5519 mark_out_of_scope (gnat_sub_entity);
5521 /* Now clear this if it has been defined, but only do so if it isn't
5522 a subprogram or parameter. We could refine this, but it isn't
5523 worth it. If this is statically allocated, it is supposed to
5524 hang around out of cope. */
5525 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5526 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5528 save_gnu_tree (gnat_entity, NULL_TREE, true);
5529 save_gnu_tree (gnat_entity, error_mark_node, true);
5533 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5534 If this is a multi-dimensional array type, do this recursively.
5537 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5538 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5539 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5542 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5544 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5545 of a one-dimensional array, since the padding has the same alias set
5546 as the field type, but if it's a multi-dimensional array, we need to
5547 see the inner types. */
5548 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5549 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5550 || TYPE_PADDING_P (gnu_old_type)))
5551 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5553 /* Unconstrained array types are deemed incomplete and would thus be given
5554 alias set 0. Retrieve the underlying array type. */
5555 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5557 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5558 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5560 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5562 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5563 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5564 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5565 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5569 case ALIAS_SET_COPY:
5570 /* The alias set shouldn't be copied between array types with different
5571 aliasing settings because this can break the aliasing relationship
5572 between the array type and its element type. */
5573 #ifndef ENABLE_CHECKING
5574 if (flag_strict_aliasing)
5576 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5577 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5578 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5579 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5581 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5584 case ALIAS_SET_SUBSET:
5585 case ALIAS_SET_SUPERSET:
5587 alias_set_type old_set = get_alias_set (gnu_old_type);
5588 alias_set_type new_set = get_alias_set (gnu_new_type);
5590 /* Do nothing if the alias sets conflict. This ensures that we
5591 never call record_alias_subset several times for the same pair
5592 or at all for alias set 0. */
5593 if (!alias_sets_conflict_p (old_set, new_set))
5595 if (op == ALIAS_SET_SUBSET)
5596 record_alias_subset (old_set, new_set);
5598 record_alias_subset (new_set, old_set);
5607 record_component_aliases (gnu_new_type);
5610 /* Return true if the size represented by GNU_SIZE can be handled by an
5611 allocation. If STATIC_P is true, consider only what can be done with a
5612 static allocation. */
5615 allocatable_size_p (tree gnu_size, bool static_p)
5617 HOST_WIDE_INT our_size;
5619 /* If this is not a static allocation, the only case we want to forbid
5620 is an overflowing size. That will be converted into a raise a
5623 return !(TREE_CODE (gnu_size) == INTEGER_CST
5624 && TREE_OVERFLOW (gnu_size));
5626 /* Otherwise, we need to deal with both variable sizes and constant
5627 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5628 since assemblers may not like very large sizes. */
5629 if (!host_integerp (gnu_size, 1))
5632 our_size = tree_low_cst (gnu_size, 1);
5633 return (int) our_size == our_size;
5636 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5637 NAME, ARGS and ERROR_POINT. */
5640 prepend_one_attribute_to (struct attrib ** attr_list,
5641 enum attr_type attr_type,
5644 Node_Id attr_error_point)
5646 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5648 attr->type = attr_type;
5649 attr->name = attr_name;
5650 attr->args = attr_args;
5651 attr->error_point = attr_error_point;
5653 attr->next = *attr_list;
5657 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5660 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5664 /* Attributes are stored as Representation Item pragmas. */
5666 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5667 gnat_temp = Next_Rep_Item (gnat_temp))
5668 if (Nkind (gnat_temp) == N_Pragma)
5670 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5671 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5672 enum attr_type etype;
5674 /* Map the kind of pragma at hand. Skip if this is not one
5675 we know how to handle. */
5677 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5679 case Pragma_Machine_Attribute:
5680 etype = ATTR_MACHINE_ATTRIBUTE;
5683 case Pragma_Linker_Alias:
5684 etype = ATTR_LINK_ALIAS;
5687 case Pragma_Linker_Section:
5688 etype = ATTR_LINK_SECTION;
5691 case Pragma_Linker_Constructor:
5692 etype = ATTR_LINK_CONSTRUCTOR;
5695 case Pragma_Linker_Destructor:
5696 etype = ATTR_LINK_DESTRUCTOR;
5699 case Pragma_Weak_External:
5700 etype = ATTR_WEAK_EXTERNAL;
5703 case Pragma_Thread_Local_Storage:
5704 etype = ATTR_THREAD_LOCAL_STORAGE;
5711 /* See what arguments we have and turn them into GCC trees for
5712 attribute handlers. These expect identifier for strings. We
5713 handle at most two arguments, static expressions only. */
5715 if (Present (gnat_assoc) && Present (First (gnat_assoc)))
5717 Node_Id gnat_arg0 = Next (First (gnat_assoc));
5718 Node_Id gnat_arg1 = Empty;
5720 if (Present (gnat_arg0)
5721 && Is_Static_Expression (Expression (gnat_arg0)))
5723 gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0));
5725 if (TREE_CODE (gnu_arg0) == STRING_CST)
5726 gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0));
5728 gnat_arg1 = Next (gnat_arg0);
5731 if (Present (gnat_arg1)
5732 && Is_Static_Expression (Expression (gnat_arg1)))
5734 gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1));
5736 if (TREE_CODE (gnu_arg1) == STRING_CST)
5737 gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1));
5741 /* Prepend to the list now. Make a list of the argument we might
5742 have, as GCC expects it. */
5743 prepend_one_attribute_to
5746 (gnu_arg1 != NULL_TREE)
5747 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5748 Present (Next (First (gnat_assoc)))
5749 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5753 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5754 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5755 return the GCC tree to use for that expression. GNU_NAME is the suffix
5756 to use if a variable needs to be created and DEFINITION is true if this
5757 is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result;
5758 otherwise, we are just elaborating the expression for side-effects. If
5759 NEED_DEBUG is true, we need a variable for debugging purposes even if it
5760 isn't needed for code generation. */
5763 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name,
5764 bool definition, bool need_value, bool need_debug)
5768 /* If we already elaborated this expression (e.g. it was involved
5769 in the definition of a private type), use the old value. */
5770 if (present_gnu_tree (gnat_expr))
5771 return get_gnu_tree (gnat_expr);
5773 /* If we don't need a value and this is static or a discriminant,
5774 we don't need to do anything. */
5776 && (Is_OK_Static_Expression (gnat_expr)
5777 || (Nkind (gnat_expr) == N_Identifier
5778 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5781 /* If it's a static expression, we don't need a variable for debugging. */
5782 if (need_debug && Is_OK_Static_Expression (gnat_expr))
5785 /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */
5786 gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity,
5787 gnu_name, definition, need_debug);
5789 /* Save the expression in case we try to elaborate this entity again. Since
5790 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5791 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5792 save_gnu_tree (gnat_expr, gnu_expr, true);
5794 return need_value ? gnu_expr : error_mark_node;
5797 /* Similar, but take a GNU expression and always return a result. */
5800 elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
5801 bool definition, bool need_debug)
5803 /* Skip any conversions and simple arithmetics to see if the expression
5804 is a read-only variable.
5805 ??? This really should remain read-only, but we have to think about
5806 the typing of the tree here. */
5808 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5809 tree gnu_decl = NULL_TREE;
5810 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5813 /* In most cases, we won't see a naked FIELD_DECL because a discriminant
5814 reference will have been replaced with a COMPONENT_REF when the type
5815 is being elaborated. However, there are some cases involving child
5816 types where we will. So convert it to a COMPONENT_REF. We hope it
5817 will be at the highest level of the expression in these cases. */
5818 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5819 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5820 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5821 gnu_expr, NULL_TREE);
5823 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5824 that is read-only, make a variable that is initialized to contain the
5825 bound when the package containing the definition is elaborated. If
5826 this entity is defined at top level and a bound or discriminant value
5827 isn't a constant or a reference to a discriminant, replace the bound
5828 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5829 rely here on the fact that an expression cannot contain both the
5830 discriminant and some other variable. */
5831 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5832 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5833 && (TREE_READONLY (gnu_inner_expr)
5834 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5835 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5837 /* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */
5838 if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr))
5841 /* Now create the variable if we need it. */
5842 if (need_debug || (expr_variable && expr_global))
5844 = create_var_decl (create_concat_name (gnat_entity,
5845 IDENTIFIER_POINTER (gnu_name)),
5846 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5847 !need_debug, Is_Public (gnat_entity),
5848 !definition, false, NULL, gnat_entity);
5850 /* We only need to use this variable if we are in global context since GCC
5851 can do the right thing in the local case. */
5852 if (expr_global && expr_variable)
5855 return expr_variable ? gnat_save_expr (gnu_expr) : gnu_expr;
5858 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5859 starting bit position so that it is aligned to ALIGN bits, and leaving at
5860 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5861 record is guaranteed to get. */
5864 make_aligning_type (tree type, unsigned int align, tree size,
5865 unsigned int base_align, int room)
5867 /* We will be crafting a record type with one field at a position set to be
5868 the next multiple of ALIGN past record'address + room bytes. We use a
5869 record placeholder to express record'address. */
5871 tree record_type = make_node (RECORD_TYPE);
5872 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5875 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5877 /* The diagram below summarizes the shape of what we manipulate:
5879 <--------- pos ---------->
5880 { +------------+-------------+-----------------+
5881 record =>{ |############| ... | field (type) |
5882 { +------------+-------------+-----------------+
5883 |<-- room -->|<- voffset ->|<---- size ----->|
5886 record_addr vblock_addr
5888 Every length is in sizetype bytes there, except "pos" which has to be
5889 set as a bit position in the GCC tree for the record. */
5891 tree room_st = size_int (room);
5892 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5893 tree voffset_st, pos, field;
5895 tree name = TYPE_NAME (type);
5897 if (TREE_CODE (name) == TYPE_DECL)
5898 name = DECL_NAME (name);
5900 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5902 /* Compute VOFFSET and then POS. The next byte position multiple of some
5903 alignment after some address is obtained by "and"ing the alignment minus
5904 1 with the two's complement of the address. */
5906 voffset_st = size_binop (BIT_AND_EXPR,
5907 size_diffop (size_zero_node, vblock_addr_st),
5908 ssize_int ((align / BITS_PER_UNIT) - 1));
5910 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5912 pos = size_binop (MULT_EXPR,
5913 convert (bitsizetype,
5914 size_binop (PLUS_EXPR, room_st, voffset_st)),
5917 /* Craft the GCC record representation. We exceptionally do everything
5918 manually here because 1) our generic circuitry is not quite ready to
5919 handle the complex position/size expressions we are setting up, 2) we
5920 have a strong simplifying factor at hand: we know the maximum possible
5921 value of voffset, and 3) we have to set/reset at least the sizes in
5922 accordance with this maximum value anyway, as we need them to convey
5923 what should be "alloc"ated for this type.
5925 Use -1 as the 'addressable' indication for the field to prevent the
5926 creation of a bitfield. We don't need one, it would have damaging
5927 consequences on the alignment computation, and create_field_decl would
5928 make one without this special argument, for instance because of the
5929 complex position expression. */
5931 field = create_field_decl (get_identifier ("F"), type, record_type,
5933 TYPE_FIELDS (record_type) = field;
5935 TYPE_ALIGN (record_type) = base_align;
5936 TYPE_USER_ALIGN (record_type) = 1;
5938 TYPE_SIZE (record_type)
5939 = size_binop (PLUS_EXPR,
5940 size_binop (MULT_EXPR, convert (bitsizetype, size),
5942 bitsize_int (align + room * BITS_PER_UNIT));
5943 TYPE_SIZE_UNIT (record_type)
5944 = size_binop (PLUS_EXPR, size,
5945 size_int (room + align / BITS_PER_UNIT));
5947 SET_TYPE_MODE (record_type, BLKmode);
5949 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5953 /* Return the result of rounding T up to ALIGN. */
5955 static inline unsigned HOST_WIDE_INT
5956 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5964 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5965 as the field type of a packed record if IN_RECORD is true, or as the
5966 component type of a packed array if IN_RECORD is false. See if we can
5967 rewrite it either as a type that has a non-BLKmode, which we can pack
5968 tighter in the packed record case, or as a smaller type. If so, return
5969 the new type. If not, return the original type. */
5972 make_packable_type (tree type, bool in_record)
5974 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5975 unsigned HOST_WIDE_INT new_size;
5976 tree new_type, old_field, field_list = NULL_TREE;
5978 /* No point in doing anything if the size is zero. */
5982 new_type = make_node (TREE_CODE (type));
5984 /* Copy the name and flags from the old type to that of the new.
5985 Note that we rely on the pointer equality created here for
5986 TYPE_NAME to look through conversions in various places. */
5987 TYPE_NAME (new_type) = TYPE_NAME (type);
5988 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5989 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5990 if (TREE_CODE (type) == RECORD_TYPE)
5991 TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type);
5993 /* If we are in a record and have a small size, set the alignment to
5994 try for an integral mode. Otherwise set it to try for a smaller
5995 type with BLKmode. */
5996 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5998 TYPE_ALIGN (new_type) = ceil_alignment (size);
5999 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
6003 unsigned HOST_WIDE_INT align;
6005 /* Do not try to shrink the size if the RM size is not constant. */
6006 if (TYPE_CONTAINS_TEMPLATE_P (type)
6007 || !host_integerp (TYPE_ADA_SIZE (type), 1))
6010 /* Round the RM size up to a unit boundary to get the minimal size
6011 for a BLKmode record. Give up if it's already the size. */
6012 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
6013 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
6014 if (new_size == size)
6017 align = new_size & -new_size;
6018 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
6021 TYPE_USER_ALIGN (new_type) = 1;
6023 /* Now copy the fields, keeping the position and size as we don't want
6024 to change the layout by propagating the packedness downwards. */
6025 for (old_field = TYPE_FIELDS (type); old_field;
6026 old_field = TREE_CHAIN (old_field))
6028 tree new_field_type = TREE_TYPE (old_field);
6029 tree new_field, new_size;
6031 if ((TREE_CODE (new_field_type) == RECORD_TYPE
6032 || TREE_CODE (new_field_type) == UNION_TYPE
6033 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
6034 && !TYPE_FAT_POINTER_P (new_field_type)
6035 && host_integerp (TYPE_SIZE (new_field_type), 1))
6036 new_field_type = make_packable_type (new_field_type, true);
6038 /* However, for the last field in a not already packed record type
6039 that is of an aggregate type, we need to use the RM size in the
6040 packable version of the record type, see finish_record_type. */
6041 if (!TREE_CHAIN (old_field)
6042 && !TYPE_PACKED (type)
6043 && (TREE_CODE (new_field_type) == RECORD_TYPE
6044 || TREE_CODE (new_field_type) == UNION_TYPE
6045 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
6046 && !TYPE_FAT_POINTER_P (new_field_type)
6047 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
6048 && TYPE_ADA_SIZE (new_field_type))
6049 new_size = TYPE_ADA_SIZE (new_field_type);
6051 new_size = DECL_SIZE (old_field);
6053 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
6054 new_type, TYPE_PACKED (type), new_size,
6055 bit_position (old_field),
6056 !DECL_NONADDRESSABLE_P (old_field));
6058 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
6059 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
6060 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
6061 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
6063 TREE_CHAIN (new_field) = field_list;
6064 field_list = new_field;
6067 finish_record_type (new_type, nreverse (field_list), 2, false);
6068 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
6070 /* If this is a padding record, we never want to make the size smaller
6071 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
6072 if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE)
6074 TYPE_SIZE (new_type) = TYPE_SIZE (type);
6075 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
6080 TYPE_SIZE (new_type) = bitsize_int (new_size);
6081 TYPE_SIZE_UNIT (new_type)
6082 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
6085 if (!TYPE_CONTAINS_TEMPLATE_P (type))
6086 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
6088 compute_record_mode (new_type);
6090 /* Try harder to get a packable type if necessary, for example
6091 in case the record itself contains a BLKmode field. */
6092 if (in_record && TYPE_MODE (new_type) == BLKmode)
6093 SET_TYPE_MODE (new_type,
6094 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
6096 /* If neither the mode nor the size has shrunk, return the old type. */
6097 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
6103 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
6104 if needed. We have already verified that SIZE and TYPE are large enough.
6105 GNAT_ENTITY is used to name the resulting record and to issue a warning.
6106 IS_COMPONENT_TYPE is true if this is being done for the component type
6107 of an array. IS_USER_TYPE is true if we must complete the original type.
6108 DEFINITION is true if this type is being defined. SAME_RM_SIZE is true
6109 if the RM size of the resulting type is to be set to SIZE too; otherwise,
6110 it's set to the RM size of the original type. */
6113 maybe_pad_type (tree type, tree size, unsigned int align,
6114 Entity_Id gnat_entity, bool is_component_type,
6115 bool is_user_type, bool definition, bool same_rm_size)
6117 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
6118 tree orig_size = TYPE_SIZE (type);
6121 /* If TYPE is a padded type, see if it agrees with any size and alignment
6122 we were given. If so, return the original type. Otherwise, strip
6123 off the padding, since we will either be returning the inner type
6124 or repadding it. If no size or alignment is specified, use that of
6125 the original padded type. */
6126 if (TYPE_IS_PADDING_P (type))
6129 || operand_equal_p (round_up (size,
6130 MAX (align, TYPE_ALIGN (type))),
6131 round_up (TYPE_SIZE (type),
6132 MAX (align, TYPE_ALIGN (type))),
6134 && (align == 0 || align == TYPE_ALIGN (type)))
6138 size = TYPE_SIZE (type);
6140 align = TYPE_ALIGN (type);
6142 type = TREE_TYPE (TYPE_FIELDS (type));
6143 orig_size = TYPE_SIZE (type);
6146 /* If the size is either not being changed or is being made smaller (which
6147 is not done here and is only valid for bitfields anyway), show the size
6148 isn't changing. Likewise, clear the alignment if it isn't being
6149 changed. Then return if we aren't doing anything. */
6151 && (operand_equal_p (size, orig_size, 0)
6152 || (TREE_CODE (orig_size) == INTEGER_CST
6153 && tree_int_cst_lt (size, orig_size))))
6156 if (align == TYPE_ALIGN (type))
6159 if (align == 0 && !size)
6162 /* If requested, complete the original type and give it a name. */
6164 create_type_decl (get_entity_name (gnat_entity), type,
6165 NULL, !Comes_From_Source (gnat_entity),
6167 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6168 && DECL_IGNORED_P (TYPE_NAME (type))),
6171 /* We used to modify the record in place in some cases, but that could
6172 generate incorrect debugging information. So make a new record
6174 record = make_node (RECORD_TYPE);
6175 TYPE_PADDING_P (record) = 1;
6177 if (Present (gnat_entity))
6178 TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD");
6180 TYPE_VOLATILE (record)
6181 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6183 TYPE_ALIGN (record) = align;
6184 TYPE_SIZE (record) = size ? size : orig_size;
6185 TYPE_SIZE_UNIT (record)
6186 = convert (sizetype,
6187 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6188 bitsize_unit_node));
6190 /* If we are changing the alignment and the input type is a record with
6191 BLKmode and a small constant size, try to make a form that has an
6192 integral mode. This might allow the padding record to also have an
6193 integral mode, which will be much more efficient. There is no point
6194 in doing so if a size is specified unless it is also a small constant
6195 size and it is incorrect to do so if we cannot guarantee that the mode
6196 will be naturally aligned since the field must always be addressable.
6198 ??? This might not always be a win when done for a stand-alone object:
6199 since the nominal and the effective type of the object will now have
6200 different modes, a VIEW_CONVERT_EXPR will be required for converting
6201 between them and it might be hard to overcome afterwards, including
6202 at the RTL level when the stand-alone object is accessed as a whole. */
6204 && TREE_CODE (type) == RECORD_TYPE
6205 && TYPE_MODE (type) == BLKmode
6206 && TREE_CODE (orig_size) == INTEGER_CST
6207 && !TREE_OVERFLOW (orig_size)
6208 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6210 || (TREE_CODE (size) == INTEGER_CST
6211 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6213 tree packable_type = make_packable_type (type, true);
6214 if (TYPE_MODE (packable_type) != BLKmode
6215 && align >= TYPE_ALIGN (packable_type))
6216 type = packable_type;
6219 /* Now create the field with the original size. */
6220 field = create_field_decl (get_identifier ("F"), type, record, 0,
6221 orig_size, bitsize_zero_node, 1);
6222 DECL_INTERNAL_P (field) = 1;
6224 /* Do not emit debug info until after the auxiliary record is built. */
6225 finish_record_type (record, field, 1, false);
6227 /* Set the same size for its RM size if requested; otherwise reuse
6228 the RM size of the original type. */
6229 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6231 /* Unless debugging information isn't being written for the input type,
6232 write a record that shows what we are a subtype of and also make a
6233 variable that indicates our size, if still variable. */
6234 if (TREE_CODE (orig_size) != INTEGER_CST
6235 && TYPE_NAME (record)
6237 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6238 && DECL_IGNORED_P (TYPE_NAME (type))))
6240 tree marker = make_node (RECORD_TYPE);
6241 tree name = TYPE_NAME (record);
6242 tree orig_name = TYPE_NAME (type);
6244 if (TREE_CODE (name) == TYPE_DECL)
6245 name = DECL_NAME (name);
6247 if (TREE_CODE (orig_name) == TYPE_DECL)
6248 orig_name = DECL_NAME (orig_name);
6250 TYPE_NAME (marker) = concat_name (name, "XVS");
6251 finish_record_type (marker,
6252 create_field_decl (orig_name,
6253 build_reference_type (type),
6254 marker, 0, NULL_TREE, NULL_TREE,
6258 add_parallel_type (TYPE_STUB_DECL (record), marker);
6260 if (definition && size && TREE_CODE (size) != INTEGER_CST)
6261 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6262 TYPE_SIZE_UNIT (record), false, false, false,
6263 false, NULL, gnat_entity);
6266 rest_of_record_type_compilation (record);
6268 /* If the size was widened explicitly, maybe give a warning. Take the
6269 original size as the maximum size of the input if there was an
6270 unconstrained record involved and round it up to the specified alignment,
6271 if one was specified. */
6272 if (CONTAINS_PLACEHOLDER_P (orig_size))
6273 orig_size = max_size (orig_size, true);
6276 orig_size = round_up (orig_size, align);
6278 if (Present (gnat_entity)
6280 && TREE_CODE (size) != MAX_EXPR
6281 && !operand_equal_p (size, orig_size, 0)
6282 && !(TREE_CODE (size) == INTEGER_CST
6283 && TREE_CODE (orig_size) == INTEGER_CST
6284 && tree_int_cst_lt (size, orig_size)))
6286 Node_Id gnat_error_node = Empty;
6288 if (Is_Packed_Array_Type (gnat_entity))
6289 gnat_entity = Original_Array_Type (gnat_entity);
6291 if ((Ekind (gnat_entity) == E_Component
6292 || Ekind (gnat_entity) == E_Discriminant)
6293 && Present (Component_Clause (gnat_entity)))
6294 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6295 else if (Present (Size_Clause (gnat_entity)))
6296 gnat_error_node = Expression (Size_Clause (gnat_entity));
6298 /* Generate message only for entities that come from source, since
6299 if we have an entity created by expansion, the message will be
6300 generated for some other corresponding source entity. */
6301 if (Comes_From_Source (gnat_entity))
6303 if (Present (gnat_error_node))
6304 post_error_ne_tree ("{^ }bits of & unused?",
6305 gnat_error_node, gnat_entity,
6306 size_diffop (size, orig_size));
6307 else if (is_component_type)
6308 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6309 gnat_entity, gnat_entity,
6310 size_diffop (size, orig_size));
6317 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6318 the value passed against the list of choices. */
6321 choices_to_gnu (tree operand, Node_Id choices)
6325 tree result = integer_zero_node;
6326 tree this_test, low = 0, high = 0, single = 0;
6328 for (choice = First (choices); Present (choice); choice = Next (choice))
6330 switch (Nkind (choice))
6333 low = gnat_to_gnu (Low_Bound (choice));
6334 high = gnat_to_gnu (High_Bound (choice));
6336 /* There's no good type to use here, so we might as well use
6337 integer_type_node. */
6339 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6340 build_binary_op (GE_EXPR, integer_type_node,
6342 build_binary_op (LE_EXPR, integer_type_node,
6347 case N_Subtype_Indication:
6348 gnat_temp = Range_Expression (Constraint (choice));
6349 low = gnat_to_gnu (Low_Bound (gnat_temp));
6350 high = gnat_to_gnu (High_Bound (gnat_temp));
6353 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6354 build_binary_op (GE_EXPR, integer_type_node,
6356 build_binary_op (LE_EXPR, integer_type_node,
6361 case N_Expanded_Name:
6362 /* This represents either a subtype range, an enumeration
6363 literal, or a constant Ekind says which. If an enumeration
6364 literal or constant, fall through to the next case. */
6365 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6366 && Ekind (Entity (choice)) != E_Constant)
6368 tree type = gnat_to_gnu_type (Entity (choice));
6370 low = TYPE_MIN_VALUE (type);
6371 high = TYPE_MAX_VALUE (type);
6374 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6375 build_binary_op (GE_EXPR, integer_type_node,
6377 build_binary_op (LE_EXPR, integer_type_node,
6382 /* ... fall through ... */
6384 case N_Character_Literal:
6385 case N_Integer_Literal:
6386 single = gnat_to_gnu (choice);
6387 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6391 case N_Others_Choice:
6392 this_test = integer_one_node;
6399 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6406 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6407 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6410 adjust_packed (tree field_type, tree record_type, int packed)
6412 /* If the field contains an item of variable size, we cannot pack it
6413 because we cannot create temporaries of non-fixed size in case
6414 we need to take the address of the field. See addressable_p and
6415 the notes on the addressability issues for further details. */
6416 if (is_variable_size (field_type))
6419 /* If the alignment of the record is specified and the field type
6420 is over-aligned, request Storage_Unit alignment for the field. */
6423 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6432 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6433 placed in GNU_RECORD_TYPE.
6435 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6436 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6437 record has a specified alignment.
6439 DEFINITION is true if this field is for a record being defined.
6441 DEBUG_INFO_P is true if we need to write debug information for types
6442 that we may create in the process. */
6445 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6446 bool definition, bool debug_info_p)
6448 tree gnu_field_id = get_entity_name (gnat_field);
6449 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6450 tree gnu_field, gnu_size, gnu_pos;
6451 bool needs_strict_alignment
6452 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6453 || Treat_As_Volatile (gnat_field));
6455 /* If this field requires strict alignment, we cannot pack it because
6456 it would very likely be under-aligned in the record. */
6457 if (needs_strict_alignment)
6460 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6462 /* If a size is specified, use it. Otherwise, if the record type is packed,
6463 use the official RM size. See "Handling of Type'Size Values" in Einfo
6464 for further details. */
6465 if (Known_Static_Esize (gnat_field))
6466 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6467 gnat_field, FIELD_DECL, false, true);
6468 else if (packed == 1)
6469 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6470 gnat_field, FIELD_DECL, false, true);
6472 gnu_size = NULL_TREE;
6474 /* If we have a specified size that is smaller than that of the field's type,
6475 or a position is specified, and the field's type is a record that doesn't
6476 require strict alignment, see if we can get either an integral mode form
6477 of the type or a smaller form. If we can, show a size was specified for
6478 the field if there wasn't one already, so we know to make this a bitfield
6479 and avoid making things wider.
6481 Changing to an integral mode form is useful when the record is packed as
6482 we can then place the field at a non-byte-aligned position and so achieve
6483 tighter packing. This is in addition required if the field shares a byte
6484 with another field and the front-end lets the back-end handle the access
6485 to the field, because GCC cannot handle non-byte-aligned BLKmode fields.
6487 Changing to a smaller form is required if the specified size is smaller
6488 than that of the field's type and the type contains sub-fields that are
6489 padded, in order to avoid generating accesses to these sub-fields that
6490 are wider than the field.
6492 We avoid the transformation if it is not required or potentially useful,
6493 as it might entail an increase of the field's alignment and have ripple
6494 effects on the outer record type. A typical case is a field known to be
6495 byte-aligned and not to share a byte with another field. */
6496 if (!needs_strict_alignment
6497 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6498 && !TYPE_FAT_POINTER_P (gnu_field_type)
6499 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6502 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6503 || (Present (Component_Clause (gnat_field))
6504 && !(UI_To_Int (Component_Bit_Offset (gnat_field))
6505 % BITS_PER_UNIT == 0
6506 && value_factor_p (gnu_size, BITS_PER_UNIT)))))))
6508 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6509 if (gnu_packable_type != gnu_field_type)
6511 gnu_field_type = gnu_packable_type;
6513 gnu_size = rm_size (gnu_field_type);
6517 /* If we are packing the record and the field is BLKmode, round the
6518 size up to a byte boundary. */
6519 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6520 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6522 if (Present (Component_Clause (gnat_field)))
6524 Entity_Id gnat_parent
6525 = Parent_Subtype (Underlying_Type (Scope (gnat_field)));
6527 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6528 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6529 gnat_field, FIELD_DECL, false, true);
6531 /* Ensure the position does not overlap with the parent subtype, if there
6532 is one. This test is omitted if the parent of the tagged type has a
6533 full rep clause since, in this case, component clauses are allowed to
6534 overlay the space allocated for the parent type and the front-end has
6535 checked that there are no overlapping components. */
6536 if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent))
6538 tree gnu_parent = gnat_to_gnu_type (gnat_parent);
6540 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6541 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6544 ("offset of& must be beyond parent{, minimum allowed is ^}",
6545 First_Bit (Component_Clause (gnat_field)), gnat_field,
6546 TYPE_SIZE_UNIT (gnu_parent));
6550 /* If this field needs strict alignment, ensure the record is
6551 sufficiently aligned and that that position and size are
6552 consistent with the alignment. */
6553 if (needs_strict_alignment)
6555 TYPE_ALIGN (gnu_record_type)
6556 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6559 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6561 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6563 ("atomic field& must be natural size of type{ (^)}",
6564 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6565 TYPE_SIZE (gnu_field_type));
6567 else if (Is_Aliased (gnat_field))
6569 ("size of aliased field& must be ^ bits",
6570 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6571 TYPE_SIZE (gnu_field_type));
6573 else if (Strict_Alignment (Etype (gnat_field)))
6575 ("size of & with aliased or tagged components not ^ bits",
6576 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6577 TYPE_SIZE (gnu_field_type));
6579 gnu_size = NULL_TREE;
6582 if (!integer_zerop (size_binop
6583 (TRUNC_MOD_EXPR, gnu_pos,
6584 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6586 if (Is_Aliased (gnat_field))
6588 ("position of aliased field& must be multiple of ^ bits",
6589 First_Bit (Component_Clause (gnat_field)), gnat_field,
6590 TYPE_ALIGN (gnu_field_type));
6592 else if (Treat_As_Volatile (gnat_field))
6594 ("position of volatile field& must be multiple of ^ bits",
6595 First_Bit (Component_Clause (gnat_field)), gnat_field,
6596 TYPE_ALIGN (gnu_field_type));
6598 else if (Strict_Alignment (Etype (gnat_field)))
6600 ("position of & with aliased or tagged components not multiple of ^ bits",
6601 First_Bit (Component_Clause (gnat_field)), gnat_field,
6602 TYPE_ALIGN (gnu_field_type));
6607 gnu_pos = NULL_TREE;
6611 if (Is_Atomic (gnat_field))
6612 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6615 /* If the record has rep clauses and this is the tag field, make a rep
6616 clause for it as well. */
6617 else if (Has_Specified_Layout (Scope (gnat_field))
6618 && Chars (gnat_field) == Name_uTag)
6620 gnu_pos = bitsize_zero_node;
6621 gnu_size = TYPE_SIZE (gnu_field_type);
6625 gnu_pos = NULL_TREE;
6627 /* We need to make the size the maximum for the type if it is
6628 self-referential and an unconstrained type. In that case, we can't
6629 pack the field since we can't make a copy to align it. */
6630 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6632 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6633 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6635 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6639 /* If a size is specified, adjust the field's type to it. */
6642 tree orig_field_type;
6644 /* If the field's type is justified modular, we would need to remove
6645 the wrapper to (better) meet the layout requirements. However we
6646 can do so only if the field is not aliased to preserve the unique
6647 layout and if the prescribed size is not greater than that of the
6648 packed array to preserve the justification. */
6649 if (!needs_strict_alignment
6650 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6651 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6652 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6654 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6657 = make_type_from_size (gnu_field_type, gnu_size,
6658 Has_Biased_Representation (gnat_field));
6660 orig_field_type = gnu_field_type;
6661 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6662 false, false, definition, true);
6664 /* If a padding record was made, declare it now since it will never be
6665 declared otherwise. This is necessary to ensure that its subtrees
6666 are properly marked. */
6667 if (gnu_field_type != orig_field_type
6668 && !DECL_P (TYPE_NAME (gnu_field_type)))
6669 create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, NULL,
6670 true, debug_info_p, gnat_field);
6673 /* Otherwise (or if there was an error), don't specify a position. */
6675 gnu_pos = NULL_TREE;
6677 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6678 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6680 /* Now create the decl for the field. */
6681 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6682 packed, gnu_size, gnu_pos,
6683 Is_Aliased (gnat_field));
6684 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6685 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6687 if (Ekind (gnat_field) == E_Discriminant)
6688 DECL_DISCRIMINANT_NUMBER (gnu_field)
6689 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6694 /* Return true if TYPE is a type with variable size, a padding type with a
6695 field of variable size or is a record that has a field such a field. */
6698 is_variable_size (tree type)
6702 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6705 if (TYPE_IS_PADDING_P (type)
6706 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6709 if (TREE_CODE (type) != RECORD_TYPE
6710 && TREE_CODE (type) != UNION_TYPE
6711 && TREE_CODE (type) != QUAL_UNION_TYPE)
6714 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6715 if (is_variable_size (TREE_TYPE (field)))
6721 /* qsort comparer for the bit positions of two record components. */
6724 compare_field_bitpos (const PTR rt1, const PTR rt2)
6726 const_tree const field1 = * (const_tree const *) rt1;
6727 const_tree const field2 = * (const_tree const *) rt2;
6729 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6731 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6734 /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set
6735 the result as the field list of GNU_RECORD_TYPE and finish it up. When
6736 called from gnat_to_gnu_entity during the processing of a record type
6737 definition, the GCC node for the parent, if any, will be the single field
6738 of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the
6739 GNU_FIELD_LIST. The other calls to this function are recursive calls for
6740 the component list of a variant and, in this case, GNU_FIELD_LIST is empty.
6742 PACKED is 1 if this is for a packed record, -1 if this is for a record
6743 with Component_Alignment of Storage_Unit, -2 if this is for a record
6744 with a specified alignment.
6746 DEFINITION is true if we are defining this record type.
6748 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6749 with a rep clause is to be added; in this case, that is all that should
6750 be done with such fields.
6752 CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying
6753 out the record. This means the alignment only serves to force fields to
6754 be bitfields, but not to require the record to be that aligned. This is
6757 ALL_REP is true if a rep clause is present for all the fields.
6759 UNCHECKED_UNION is true if we are building this type for a record with a
6760 Pragma Unchecked_Union.
6762 DEBUG_INFO_P is true if we need to write debug information about the type.
6764 MAYBE_UNUSED is true if this type may be unused in the end; this doesn't
6765 mean that its contents may be unused as well, but only the container. */
6769 components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
6770 tree gnu_field_list, int packed, bool definition,
6771 tree *p_gnu_rep_list, bool cancel_alignment,
6772 bool all_rep, bool unchecked_union, bool debug_info_p,
6775 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6776 bool layout_with_rep = false;
6777 Node_Id component_decl, variant_part;
6778 tree gnu_our_rep_list = NULL_TREE;
6779 tree gnu_field, gnu_next, gnu_last = tree_last (gnu_field_list);
6781 /* For each component referenced in a component declaration create a GCC
6782 field and add it to the list, skipping pragmas in the GNAT list. */
6783 if (Present (Component_Items (gnat_component_list)))
6785 = First_Non_Pragma (Component_Items (gnat_component_list));
6786 Present (component_decl);
6787 component_decl = Next_Non_Pragma (component_decl))
6789 Entity_Id gnat_field = Defining_Entity (component_decl);
6790 Name_Id gnat_name = Chars (gnat_field);
6792 /* If present, the _Parent field must have been created as the single
6793 field of the record type. Put it before any other fields. */
6794 if (gnat_name == Name_uParent)
6796 gnu_field = TYPE_FIELDS (gnu_record_type);
6797 gnu_field_list = chainon (gnu_field_list, gnu_field);
6801 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
6802 definition, debug_info_p);
6804 /* If this is the _Tag field, put it before any other fields. */
6805 if (gnat_name == Name_uTag)
6806 gnu_field_list = chainon (gnu_field_list, gnu_field);
6808 /* If this is the _Controller field, put it before the other
6809 fields except for the _Tag or _Parent field. */
6810 else if (gnat_name == Name_uController && gnu_last)
6812 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
6813 TREE_CHAIN (gnu_last) = gnu_field;
6816 /* If this is a regular field, put it after the other fields. */
6819 TREE_CHAIN (gnu_field) = gnu_field_list;
6820 gnu_field_list = gnu_field;
6822 gnu_last = gnu_field;
6826 save_gnu_tree (gnat_field, gnu_field, false);
6829 /* At the end of the component list there may be a variant part. */
6830 variant_part = Variant_Part (gnat_component_list);
6832 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6833 mutually exclusive and should go in the same memory. To do this we need
6834 to treat each variant as a record whose elements are created from the
6835 component list for the variant. So here we create the records from the
6836 lists for the variants and put them all into the QUAL_UNION_TYPE.
6837 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6838 use GNU_RECORD_TYPE if there are no fields so far. */
6839 if (Present (variant_part))
6841 Node_Id gnat_discr = Name (variant_part), variant;
6842 tree gnu_discr = gnat_to_gnu (gnat_discr);
6843 tree gnu_name = TYPE_NAME (gnu_record_type);
6845 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6847 tree gnu_union_type, gnu_union_name, gnu_union_field;
6848 tree gnu_variant_list = NULL_TREE;
6850 if (TREE_CODE (gnu_name) == TYPE_DECL)
6851 gnu_name = DECL_NAME (gnu_name);
6854 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6856 /* Reuse an enclosing union if all fields are in the variant part
6857 and there is no representation clause on the record, to match
6858 the layout of C unions. There is an associated check below. */
6860 && TREE_CODE (gnu_record_type) == UNION_TYPE
6861 && !TYPE_PACKED (gnu_record_type))
6862 gnu_union_type = gnu_record_type;
6866 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6868 TYPE_NAME (gnu_union_type) = gnu_union_name;
6869 TYPE_ALIGN (gnu_union_type) = 0;
6870 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6873 for (variant = First_Non_Pragma (Variants (variant_part));
6875 variant = Next_Non_Pragma (variant))
6877 tree gnu_variant_type = make_node (RECORD_TYPE);
6878 tree gnu_inner_name;
6881 Get_Variant_Encoding (variant);
6882 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6883 TYPE_NAME (gnu_variant_type)
6884 = concat_name (gnu_union_name,
6885 IDENTIFIER_POINTER (gnu_inner_name));
6887 /* Set the alignment of the inner type in case we need to make
6888 inner objects into bitfields, but then clear it out so the
6889 record actually gets only the alignment required. */
6890 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6891 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6893 /* Similarly, if the outer record has a size specified and all
6894 fields have record rep clauses, we can propagate the size
6895 into the variant part. */
6896 if (all_rep_and_size)
6898 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6899 TYPE_SIZE_UNIT (gnu_variant_type)
6900 = TYPE_SIZE_UNIT (gnu_record_type);
6903 /* Add the fields into the record type for the variant. Note that
6904 we aren't sure to really use it at this point, see below. */
6905 components_to_record (gnu_variant_type, Component_List (variant),
6906 NULL_TREE, packed, definition,
6907 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6908 unchecked_union, debug_info_p, true);
6910 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6912 Set_Present_Expr (variant, annotate_value (gnu_qual));
6914 /* If this is an Unchecked_Union and we have exactly one field,
6915 use this field directly to match the layout of C unions. */
6917 && TYPE_FIELDS (gnu_variant_type)
6918 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6919 gnu_field = TYPE_FIELDS (gnu_variant_type);
6922 /* Deal with packedness like in gnat_to_gnu_field. */
6924 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6926 /* Finalize the record type now. We used to throw away
6927 empty records but we no longer do that because we need
6928 them to generate complete debug info for the variant;
6929 otherwise, the union type definition will be lacking
6930 the fields associated with these empty variants. */
6931 rest_of_record_type_compilation (gnu_variant_type);
6932 create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type,
6933 NULL, true, debug_info_p, gnat_component_list);
6935 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6936 gnu_union_type, field_packed,
6938 ? TYPE_SIZE (gnu_variant_type)
6941 ? bitsize_zero_node : 0),
6944 DECL_INTERNAL_P (gnu_field) = 1;
6946 if (!unchecked_union)
6947 DECL_QUALIFIER (gnu_field) = gnu_qual;
6950 TREE_CHAIN (gnu_field) = gnu_variant_list;
6951 gnu_variant_list = gnu_field;
6954 /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */
6955 if (gnu_variant_list)
6957 int union_field_packed;
6959 if (all_rep_and_size)
6961 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6962 TYPE_SIZE_UNIT (gnu_union_type)
6963 = TYPE_SIZE_UNIT (gnu_record_type);
6966 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6967 all_rep_and_size ? 1 : 0, debug_info_p);
6969 /* If GNU_UNION_TYPE is our record type, it means we must have an
6970 Unchecked_Union with no fields. Verify that and, if so, just
6972 if (gnu_union_type == gnu_record_type)
6974 gcc_assert (unchecked_union
6976 && !gnu_our_rep_list);
6980 create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type,
6981 NULL, true, debug_info_p, gnat_component_list);
6983 /* Deal with packedness like in gnat_to_gnu_field. */
6985 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6988 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6990 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6991 all_rep ? bitsize_zero_node : 0, 0);
6993 DECL_INTERNAL_P (gnu_union_field) = 1;
6994 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6995 gnu_field_list = gnu_union_field;
6999 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
7000 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do
7001 this in a separate pass since we want to handle the discriminants but
7002 can't play with them until we've used them in debugging data above.
7004 ??? If we then reorder them, debugging information will be wrong but
7005 there's nothing that can be done about this at the moment. */
7006 gnu_last = NULL_TREE;
7007 for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next)
7009 gnu_next = TREE_CHAIN (gnu_field);
7011 if (DECL_FIELD_OFFSET (gnu_field))
7014 gnu_field_list = gnu_next;
7016 TREE_CHAIN (gnu_last) = gnu_next;
7018 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
7019 gnu_our_rep_list = gnu_field;
7022 gnu_last = gnu_field;
7025 /* If we have any fields in our rep'ed field list and it is not the case that
7026 all the fields in the record have rep clauses and P_REP_LIST is nonzero,
7027 set it and ignore these fields. */
7028 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
7029 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
7031 /* Otherwise, sort the fields by bit position and put them into their own
7032 record, before the others, if we also have fields without rep clauses. */
7033 else if (gnu_our_rep_list)
7036 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
7037 int i, len = list_length (gnu_our_rep_list);
7038 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
7040 for (gnu_field = gnu_our_rep_list, i = 0;
7042 gnu_field = TREE_CHAIN (gnu_field), i++)
7043 gnu_arr[i] = gnu_field;
7045 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
7047 /* Put the fields in the list in order of increasing position, which
7048 means we start from the end. */
7049 gnu_our_rep_list = NULL_TREE;
7050 for (i = len - 1; i >= 0; i--)
7052 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
7053 gnu_our_rep_list = gnu_arr[i];
7054 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
7059 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, debug_info_p);
7061 = create_field_decl (get_identifier ("REP"), gnu_rep_type,
7062 gnu_record_type, 0, NULL_TREE, NULL_TREE, 1);
7063 DECL_INTERNAL_P (gnu_field) = 1;
7064 gnu_field_list = chainon (gnu_field_list, gnu_field);
7068 layout_with_rep = true;
7069 gnu_field_list = nreverse (gnu_our_rep_list);
7073 if (cancel_alignment)
7074 TYPE_ALIGN (gnu_record_type) = 0;
7076 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
7077 layout_with_rep ? 1 : 0, debug_info_p && !maybe_unused);
7080 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
7081 placed into an Esize, Component_Bit_Offset, or Component_Size value
7082 in the GNAT tree. */
7085 annotate_value (tree gnu_size)
7088 Node_Ref_Or_Val ops[3], ret;
7089 struct tree_int_map **h = NULL;
7092 /* See if we've already saved the value for this node. */
7093 if (EXPR_P (gnu_size))
7095 struct tree_int_map in;
7096 if (!annotate_value_cache)
7097 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
7098 tree_int_map_eq, 0);
7099 in.base.from = gnu_size;
7100 h = (struct tree_int_map **)
7101 htab_find_slot (annotate_value_cache, &in, INSERT);
7104 return (Node_Ref_Or_Val) (*h)->to;
7107 /* If we do not return inside this switch, TCODE will be set to the
7108 code to use for a Create_Node operand and LEN (set above) will be
7109 the number of recursive calls for us to make. */
7111 switch (TREE_CODE (gnu_size))
7114 if (TREE_OVERFLOW (gnu_size))
7117 /* This may have come from a conversion from some smaller type,
7118 so ensure this is in bitsizetype. */
7119 gnu_size = convert (bitsizetype, gnu_size);
7121 /* For negative values, use NEGATE_EXPR of the supplied value. */
7122 if (tree_int_cst_sgn (gnu_size) < 0)
7124 /* The ridiculous code below is to handle the case of the largest
7125 negative integer. */
7126 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
7127 bool adjust = false;
7130 if (TREE_OVERFLOW (negative_size))
7133 = size_binop (MINUS_EXPR, bitsize_zero_node,
7134 size_binop (PLUS_EXPR, gnu_size,
7139 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
7141 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
7143 return annotate_value (temp);
7146 if (!host_integerp (gnu_size, 1))
7149 size = tree_low_cst (gnu_size, 1);
7151 /* This peculiar test is to make sure that the size fits in an int
7152 on machines where HOST_WIDE_INT is not "int". */
7153 if (tree_low_cst (gnu_size, 1) == size)
7154 return UI_From_Int (size);
7159 /* The only case we handle here is a simple discriminant reference. */
7160 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
7161 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
7162 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7163 return Create_Node (Discrim_Val,
7164 annotate_value (DECL_DISCRIMINANT_NUMBER
7165 (TREE_OPERAND (gnu_size, 1))),
7170 CASE_CONVERT: case NON_LVALUE_EXPR:
7171 return annotate_value (TREE_OPERAND (gnu_size, 0));
7173 /* Now just list the operations we handle. */
7174 case COND_EXPR: tcode = Cond_Expr; break;
7175 case PLUS_EXPR: tcode = Plus_Expr; break;
7176 case MINUS_EXPR: tcode = Minus_Expr; break;
7177 case MULT_EXPR: tcode = Mult_Expr; break;
7178 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7179 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7180 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7181 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7182 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7183 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7184 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7185 case NEGATE_EXPR: tcode = Negate_Expr; break;
7186 case MIN_EXPR: tcode = Min_Expr; break;
7187 case MAX_EXPR: tcode = Max_Expr; break;
7188 case ABS_EXPR: tcode = Abs_Expr; break;
7189 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7190 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7191 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7192 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7193 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7194 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7195 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7196 case LT_EXPR: tcode = Lt_Expr; break;
7197 case LE_EXPR: tcode = Le_Expr; break;
7198 case GT_EXPR: tcode = Gt_Expr; break;
7199 case GE_EXPR: tcode = Ge_Expr; break;
7200 case EQ_EXPR: tcode = Eq_Expr; break;
7201 case NE_EXPR: tcode = Ne_Expr; break;
7205 tree t = maybe_inline_call_in_expr (gnu_size);
7207 return annotate_value (t);
7210 /* Fall through... */
7216 /* Now get each of the operands that's relevant for this code. If any
7217 cannot be expressed as a repinfo node, say we can't. */
7218 for (i = 0; i < 3; i++)
7221 for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++)
7223 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7224 if (ops[i] == No_Uint)
7228 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7230 /* Save the result in the cache. */
7233 *h = GGC_NEW (struct tree_int_map);
7234 (*h)->base.from = gnu_size;
7241 /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception)
7242 and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the
7243 size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null.
7244 BY_REF is true if the object is used by reference. */
7247 annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref)
7251 if (TYPE_IS_FAT_POINTER_P (gnu_type))
7252 gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type);
7254 gnu_type = TREE_TYPE (gnu_type);
7257 if (Unknown_Esize (gnat_entity))
7259 if (TREE_CODE (gnu_type) == RECORD_TYPE
7260 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7261 size = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
7263 size = TYPE_SIZE (gnu_type);
7266 Set_Esize (gnat_entity, annotate_value (size));
7269 if (Unknown_Alignment (gnat_entity))
7270 Set_Alignment (gnat_entity,
7271 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
7274 /* Return first element of field list whose TREE_PURPOSE is the same as ELEM.
7275 Return NULL_TREE if there is no such element in the list. */
7278 purpose_member_field (const_tree elem, tree list)
7282 tree field = TREE_PURPOSE (list);
7283 if (SAME_FIELD_P (field, elem))
7285 list = TREE_CHAIN (list);
7290 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type,
7291 set Component_Bit_Offset and Esize of the components to the position and
7292 size used by Gigi. */
7295 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7297 Entity_Id gnat_field;
7300 /* We operate by first making a list of all fields and their position (we
7301 can get the size easily) and then update all the sizes in the tree. */
7303 = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node,
7304 BIGGEST_ALIGNMENT, NULL_TREE);
7306 for (gnat_field = First_Entity (gnat_entity);
7307 Present (gnat_field);
7308 gnat_field = Next_Entity (gnat_field))
7309 if (Ekind (gnat_field) == E_Component
7310 || (Ekind (gnat_field) == E_Discriminant
7311 && !Is_Unchecked_Union (Scope (gnat_field))))
7313 tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field),
7319 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7321 /* In this mode the tag and parent components are not
7322 generated, so we add the appropriate offset to each
7323 component. For a component appearing in the current
7324 extension, the offset is the size of the parent. */
7325 if (Is_Derived_Type (gnat_entity)
7326 && Original_Record_Component (gnat_field) == gnat_field)
7328 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7331 parent_offset = bitsize_int (POINTER_SIZE);
7334 parent_offset = bitsize_zero_node;
7336 Set_Component_Bit_Offset
7339 (size_binop (PLUS_EXPR,
7340 bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0),
7341 TREE_VEC_ELT (TREE_VALUE (t), 2)),
7344 Set_Esize (gnat_field,
7345 annotate_value (DECL_SIZE (TREE_PURPOSE (t))));
7347 else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity))
7349 /* If there is no entry, this is an inherited component whose
7350 position is the same as in the parent type. */
7351 Set_Component_Bit_Offset
7353 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7355 Set_Esize (gnat_field,
7356 Esize (Original_Record_Component (gnat_field)));
7361 /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is
7362 the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the
7363 value to be placed into DECL_OFFSET_ALIGN and the bit position. The list
7364 of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT
7365 is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the
7366 bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a
7367 pre-existing list to be chained to the newly created entries. */
7370 build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos,
7371 tree gnu_bitpos, unsigned int offset_align, tree gnu_list)
7375 for (gnu_field = TYPE_FIELDS (gnu_type);
7377 gnu_field = TREE_CHAIN (gnu_field))
7379 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7380 DECL_FIELD_BIT_OFFSET (gnu_field));
7381 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7382 DECL_FIELD_OFFSET (gnu_field));
7383 unsigned int our_offset_align
7384 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7385 tree v = make_tree_vec (3);
7387 TREE_VEC_ELT (v, 0) = gnu_our_offset;
7388 TREE_VEC_ELT (v, 1) = size_int (our_offset_align);
7389 TREE_VEC_ELT (v, 2) = gnu_our_bitpos;
7390 gnu_list = tree_cons (gnu_field, v, gnu_list);
7392 /* Recurse on internal fields, flattening the nested fields except for
7393 those in the variant part, if requested. */
7394 if (DECL_INTERNAL_P (gnu_field))
7396 tree gnu_field_type = TREE_TYPE (gnu_field);
7397 if (do_not_flatten_variant
7398 && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE)
7400 = build_position_list (gnu_field_type, do_not_flatten_variant,
7401 size_zero_node, bitsize_zero_node,
7402 BIGGEST_ALIGNMENT, gnu_list);
7405 = build_position_list (gnu_field_type, do_not_flatten_variant,
7406 gnu_our_offset, gnu_our_bitpos,
7407 our_offset_align, gnu_list);
7414 /* Return a TREE_LIST describing the substitutions needed to reflect the
7415 discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can
7416 be in any order. TREE_PURPOSE gives the tree for the discriminant and
7417 TREE_VALUE is the replacement value. They are in the form of operands
7418 to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for a definition
7422 build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition)
7424 tree gnu_list = NULL_TREE;
7425 Entity_Id gnat_discrim;
7428 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
7429 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
7430 Present (gnat_discrim);
7431 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
7432 gnat_value = Next_Elmt (gnat_value))
7433 /* Ignore access discriminants. */
7434 if (!Is_Access_Type (Etype (Node (gnat_value))))
7436 tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim);
7437 gnu_list = tree_cons (gnu_field,
7438 convert (TREE_TYPE (gnu_field),
7439 elaborate_expression
7440 (Node (gnat_value), gnat_subtype,
7441 get_entity_name (gnat_discrim),
7442 definition, true, false)),
7449 /* Scan all fields in QUAL_UNION_TYPE and return a TREE_LIST describing the
7450 variants of QUAL_UNION_TYPE that are still relevant after applying the
7451 substitutions described in SUBST_LIST. TREE_PURPOSE is the type of the
7452 variant and TREE_VALUE is a TREE_VEC containing the field, the new value
7453 of the qualifier and NULL_TREE respectively. GNU_LIST is a pre-existing
7454 list to be chained to the newly created entries. */
7457 build_variant_list (tree qual_union_type, tree subst_list, tree gnu_list)
7461 for (gnu_field = TYPE_FIELDS (qual_union_type);
7463 gnu_field = TREE_CHAIN (gnu_field))
7465 tree t, qual = DECL_QUALIFIER (gnu_field);
7467 for (t = subst_list; t; t = TREE_CHAIN (t))
7468 qual = SUBSTITUTE_IN_EXPR (qual, TREE_PURPOSE (t), TREE_VALUE (t));
7470 /* If the new qualifier is not unconditionally false, its variant may
7471 still be accessed. */
7472 if (!integer_zerop (qual))
7474 tree variant_type = TREE_TYPE (gnu_field), variant_subpart;
7475 tree v = make_tree_vec (3);
7476 TREE_VEC_ELT (v, 0) = gnu_field;
7477 TREE_VEC_ELT (v, 1) = qual;
7478 TREE_VEC_ELT (v, 2) = NULL_TREE;
7479 gnu_list = tree_cons (variant_type, v, gnu_list);
7481 /* Recurse on the variant subpart of the variant, if any. */
7482 variant_subpart = get_variant_part (variant_type);
7483 if (variant_subpart)
7484 gnu_list = build_variant_list (TREE_TYPE (variant_subpart),
7485 subst_list, gnu_list);
7487 /* If the new qualifier is unconditionally true, the subsequent
7488 variants cannot be accessed. */
7489 if (integer_onep (qual))
7497 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7498 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7499 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7500 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7501 for the size of a field. COMPONENT_P is true if we are being called
7502 to process the Component_Size of GNAT_OBJECT. This is used for error
7503 message handling and to indicate to use the object size of GNU_TYPE.
7504 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7505 it means that a size of zero should be treated as an unspecified size. */
7508 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7509 enum tree_code kind, bool component_p, bool zero_ok)
7511 Node_Id gnat_error_node;
7512 tree type_size, size;
7514 /* Return 0 if no size was specified. */
7515 if (uint_size == No_Uint)
7518 /* Find the node to use for errors. */
7519 if ((Ekind (gnat_object) == E_Component
7520 || Ekind (gnat_object) == E_Discriminant)
7521 && Present (Component_Clause (gnat_object)))
7522 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7523 else if (Present (Size_Clause (gnat_object)))
7524 gnat_error_node = Expression (Size_Clause (gnat_object));
7526 gnat_error_node = gnat_object;
7528 /* Get the size as a tree. Issue an error if a size was specified but
7529 cannot be represented in sizetype. */
7530 size = UI_To_gnu (uint_size, bitsizetype);
7531 if (TREE_OVERFLOW (size))
7534 post_error_ne ("component size of & is too large", gnat_error_node,
7537 post_error_ne ("size of & is too large", gnat_error_node,
7542 /* Ignore a negative size since that corresponds to our back-annotation.
7543 Also ignore a zero size if it is not permitted. */
7544 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7547 /* The size of objects is always a multiple of a byte. */
7548 if (kind == VAR_DECL
7549 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7552 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7553 gnat_error_node, gnat_object);
7555 post_error_ne ("size for& is not a multiple of Storage_Unit",
7556 gnat_error_node, gnat_object);
7560 /* If this is an integral type or a packed array type, the front-end has
7561 verified the size, so we need not do it here (which would entail
7562 checking against the bounds). However, if this is an aliased object,
7563 it may not be smaller than the type of the object. */
7564 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7565 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7568 /* If the object is a record that contains a template, add the size of
7569 the template to the specified size. */
7570 if (TREE_CODE (gnu_type) == RECORD_TYPE
7571 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7572 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7574 if (kind == VAR_DECL
7575 /* If a type needs strict alignment, a component of this type in
7576 a packed record cannot be packed and thus uses the type size. */
7577 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7578 type_size = TYPE_SIZE (gnu_type);
7580 type_size = rm_size (gnu_type);
7582 /* Modify the size of the type to be that of the maximum size if it has a
7584 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7585 type_size = max_size (type_size, true);
7587 /* If this is an access type or a fat pointer, the minimum size is that given
7588 by the smallest integral mode that's valid for pointers. */
7589 if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type))
7591 enum machine_mode p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7592 while (!targetm.valid_pointer_mode (p_mode))
7593 p_mode = GET_MODE_WIDER_MODE (p_mode);
7594 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7597 /* If the size of the object is a constant, the new size must not be
7599 if (TREE_CODE (type_size) != INTEGER_CST
7600 || TREE_OVERFLOW (type_size)
7601 || tree_int_cst_lt (size, type_size))
7605 ("component size for& too small{, minimum allowed is ^}",
7606 gnat_error_node, gnat_object, type_size);
7609 ("size for& too small{, minimum allowed is ^}",
7610 gnat_error_node, gnat_object, type_size);
7618 /* Similarly, but both validate and process a value of RM size. This
7619 routine is only called for types. */
7622 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7624 Node_Id gnat_attr_node;
7625 tree old_size, size;
7627 /* Do nothing if no size was specified. */
7628 if (uint_size == No_Uint)
7631 /* Only issue an error if a Value_Size clause was explicitly given.
7632 Otherwise, we'd be duplicating an error on the Size clause. */
7634 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7636 /* Get the size as a tree. Issue an error if a size was specified but
7637 cannot be represented in sizetype. */
7638 size = UI_To_gnu (uint_size, bitsizetype);
7639 if (TREE_OVERFLOW (size))
7641 if (Present (gnat_attr_node))
7642 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7647 /* Ignore a negative size since that corresponds to our back-annotation.
7648 Also ignore a zero size unless a Value_Size clause exists, or a size
7649 clause exists, or this is an integer type, in which case the front-end
7650 will have always set it. */
7651 if (tree_int_cst_sgn (size) < 0
7652 || (integer_zerop (size)
7653 && No (gnat_attr_node)
7654 && !Has_Size_Clause (gnat_entity)
7655 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7658 old_size = rm_size (gnu_type);
7660 /* If the old size is self-referential, get the maximum size. */
7661 if (CONTAINS_PLACEHOLDER_P (old_size))
7662 old_size = max_size (old_size, true);
7664 /* If the size of the object is a constant, the new size must not be smaller
7665 (the front-end has verified this for scalar and packed array types). */
7666 if (TREE_CODE (old_size) != INTEGER_CST
7667 || TREE_OVERFLOW (old_size)
7668 || (AGGREGATE_TYPE_P (gnu_type)
7669 && !(TREE_CODE (gnu_type) == ARRAY_TYPE
7670 && TYPE_PACKED_ARRAY_TYPE_P (gnu_type))
7671 && !(TYPE_IS_PADDING_P (gnu_type)
7672 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE
7673 && TYPE_PACKED_ARRAY_TYPE_P
7674 (TREE_TYPE (TYPE_FIELDS (gnu_type))))
7675 && tree_int_cst_lt (size, old_size)))
7677 if (Present (gnat_attr_node))
7679 ("Value_Size for& too small{, minimum allowed is ^}",
7680 gnat_attr_node, gnat_entity, old_size);
7684 /* Otherwise, set the RM size proper for integral types... */
7685 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7686 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7687 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7688 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7689 SET_TYPE_RM_SIZE (gnu_type, size);
7691 /* ...or the Ada size for record and union types. */
7692 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7693 || TREE_CODE (gnu_type) == UNION_TYPE
7694 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7695 && !TYPE_FAT_POINTER_P (gnu_type))
7696 SET_TYPE_ADA_SIZE (gnu_type, size);
7699 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7700 If TYPE is the best type, return it. Otherwise, make a new type. We
7701 only support new integral and pointer types. FOR_BIASED is true if
7702 we are making a biased type. */
7705 make_type_from_size (tree type, tree size_tree, bool for_biased)
7707 unsigned HOST_WIDE_INT size;
7711 /* If size indicates an error, just return TYPE to avoid propagating
7712 the error. Likewise if it's too large to represent. */
7713 if (!size_tree || !host_integerp (size_tree, 1))
7716 size = tree_low_cst (size_tree, 1);
7718 switch (TREE_CODE (type))
7723 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7724 && TYPE_BIASED_REPRESENTATION_P (type));
7726 /* Integer types with precision 0 are forbidden. */
7730 /* Only do something if the type is not a packed array type and
7731 doesn't already have the proper size. */
7732 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7733 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7736 biased_p |= for_biased;
7737 if (size > LONG_LONG_TYPE_SIZE)
7738 size = LONG_LONG_TYPE_SIZE;
7740 if (TYPE_UNSIGNED (type) || biased_p)
7741 new_type = make_unsigned_type (size);
7743 new_type = make_signed_type (size);
7744 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7745 SET_TYPE_RM_MIN_VALUE (new_type,
7746 convert (TREE_TYPE (new_type),
7747 TYPE_MIN_VALUE (type)));
7748 SET_TYPE_RM_MAX_VALUE (new_type,
7749 convert (TREE_TYPE (new_type),
7750 TYPE_MAX_VALUE (type)));
7751 /* Propagate the name to avoid creating a fake subrange type. */
7752 if (TYPE_NAME (type))
7754 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7755 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7757 TYPE_NAME (new_type) = TYPE_NAME (type);
7759 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7760 SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
7764 /* Do something if this is a fat pointer, in which case we
7765 may need to return the thin pointer. */
7766 if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7768 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7769 if (!targetm.valid_pointer_mode (p_mode))
7772 build_pointer_type_for_mode
7773 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7779 /* Only do something if this is a thin pointer, in which case we
7780 may need to return the fat pointer. */
7781 if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7783 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7793 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7794 a type or object whose present alignment is ALIGN. If this alignment is
7795 valid, return it. Otherwise, give an error and return ALIGN. */
7798 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7800 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7801 unsigned int new_align;
7802 Node_Id gnat_error_node;
7804 /* Don't worry about checking alignment if alignment was not specified
7805 by the source program and we already posted an error for this entity. */
7806 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7809 /* Post the error on the alignment clause if any. Note, for the implicit
7810 base type of an array type, the alignment clause is on the first
7812 if (Present (Alignment_Clause (gnat_entity)))
7813 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7815 else if (Is_Itype (gnat_entity)
7816 && Is_Array_Type (gnat_entity)
7817 && Etype (gnat_entity) == gnat_entity
7818 && Present (Alignment_Clause (First_Subtype (gnat_entity))))
7820 Expression (Alignment_Clause (First_Subtype (gnat_entity)));
7823 gnat_error_node = gnat_entity;
7825 /* Within GCC, an alignment is an integer, so we must make sure a value is
7826 specified that fits in that range. Also, there is an upper bound to
7827 alignments we can support/allow. */
7828 if (!UI_Is_In_Int_Range (alignment)
7829 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7830 post_error_ne_num ("largest supported alignment for& is ^",
7831 gnat_error_node, gnat_entity, max_allowed_alignment);
7832 else if (!(Present (Alignment_Clause (gnat_entity))
7833 && From_At_Mod (Alignment_Clause (gnat_entity)))
7834 && new_align * BITS_PER_UNIT < align)
7836 unsigned int double_align;
7837 bool is_capped_double, align_clause;
7839 /* If the default alignment of "double" or larger scalar types is
7840 specifically capped and the new alignment is above the cap, do
7841 not post an error and change the alignment only if there is an
7842 alignment clause; this makes it possible to have the associated
7843 GCC type overaligned by default for performance reasons. */
7844 if ((double_align = double_float_alignment) > 0)
7847 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7849 = is_double_float_or_array (gnat_type, &align_clause);
7851 else if ((double_align = double_scalar_alignment) > 0)
7854 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7856 = is_double_scalar_or_array (gnat_type, &align_clause);
7859 is_capped_double = align_clause = false;
7861 if (is_capped_double && new_align >= double_align)
7864 align = new_align * BITS_PER_UNIT;
7868 if (is_capped_double)
7869 align = double_align * BITS_PER_UNIT;
7871 post_error_ne_num ("alignment for& must be at least ^",
7872 gnat_error_node, gnat_entity,
7873 align / BITS_PER_UNIT);
7878 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7879 if (new_align > align)
7886 /* Return the smallest alignment not less than SIZE. */
7889 ceil_alignment (unsigned HOST_WIDE_INT size)
7891 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7894 /* Verify that OBJECT, a type or decl, is something we can implement
7895 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7896 if we require atomic components. */
7899 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7901 Node_Id gnat_error_point = gnat_entity;
7903 enum machine_mode mode;
7907 /* There are three case of what OBJECT can be. It can be a type, in which
7908 case we take the size, alignment and mode from the type. It can be a
7909 declaration that was indirect, in which case the relevant values are
7910 that of the type being pointed to, or it can be a normal declaration,
7911 in which case the values are of the decl. The code below assumes that
7912 OBJECT is either a type or a decl. */
7913 if (TYPE_P (object))
7915 /* If this is an anonymous base type, nothing to check. Error will be
7916 reported on the source type. */
7917 if (!Comes_From_Source (gnat_entity))
7920 mode = TYPE_MODE (object);
7921 align = TYPE_ALIGN (object);
7922 size = TYPE_SIZE (object);
7924 else if (DECL_BY_REF_P (object))
7926 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7927 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7928 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7932 mode = DECL_MODE (object);
7933 align = DECL_ALIGN (object);
7934 size = DECL_SIZE (object);
7937 /* Consider all floating-point types atomic and any types that that are
7938 represented by integers no wider than a machine word. */
7939 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7940 || ((GET_MODE_CLASS (mode) == MODE_INT
7941 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7942 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7945 /* For the moment, also allow anything that has an alignment equal
7946 to its size and which is smaller than a word. */
7947 if (size && TREE_CODE (size) == INTEGER_CST
7948 && compare_tree_int (size, align) == 0
7949 && align <= BITS_PER_WORD)
7952 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7953 gnat_node = Next_Rep_Item (gnat_node))
7955 if (!comp_p && Nkind (gnat_node) == N_Pragma
7956 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7958 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7959 else if (comp_p && Nkind (gnat_node) == N_Pragma
7960 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7961 == Pragma_Atomic_Components))
7962 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7966 post_error_ne ("atomic access to component of & cannot be guaranteed",
7967 gnat_error_point, gnat_entity);
7969 post_error_ne ("atomic access to & cannot be guaranteed",
7970 gnat_error_point, gnat_entity);
7973 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7974 have compatible signatures so that a call using one type may be safely
7975 issued if the actual target function type is the other. Return 1 if it is
7976 the case, 0 otherwise, and post errors on the incompatibilities.
7978 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7979 that calls to the subprogram will have arguments suitable for the later
7980 underlying builtin expansion. */
7983 compatible_signatures_p (tree ftype1, tree ftype2)
7985 /* As of now, we only perform very trivial tests and consider it's the
7986 programmer's responsibility to ensure the type correctness in the Ada
7987 declaration, as in the regular Import cases.
7989 Mismatches typically result in either error messages from the builtin
7990 expander, internal compiler errors, or in a real call sequence. This
7991 should be refined to issue diagnostics helping error detection and
7994 /* Almost fake test, ensuring a use of each argument. */
7995 if (ftype1 == ftype2)
8001 /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type
8002 and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the
8003 specified size for this field. POS_LIST is a position list describing
8004 the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied
8008 create_field_decl_from (tree old_field, tree field_type, tree record_type,
8009 tree size, tree pos_list, tree subst_list)
8011 tree t = TREE_VALUE (purpose_member (old_field, pos_list));
8012 tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2);
8013 unsigned int offset_align = tree_low_cst (TREE_VEC_ELT (t, 1), 1);
8014 tree new_pos, new_field;
8016 if (CONTAINS_PLACEHOLDER_P (pos))
8017 for (t = subst_list; t; t = TREE_CHAIN (t))
8018 pos = SUBSTITUTE_IN_EXPR (pos, TREE_PURPOSE (t), TREE_VALUE (t));
8020 /* If the position is now a constant, we can set it as the position of the
8021 field when we make it. Otherwise, we need to deal with it specially. */
8022 if (TREE_CONSTANT (pos))
8023 new_pos = bit_from_pos (pos, bitpos);
8025 new_pos = NULL_TREE;
8028 = create_field_decl (DECL_NAME (old_field), field_type, record_type,
8029 DECL_PACKED (old_field), size, new_pos,
8030 !DECL_NONADDRESSABLE_P (old_field));
8034 normalize_offset (&pos, &bitpos, offset_align);
8035 DECL_FIELD_OFFSET (new_field) = pos;
8036 DECL_FIELD_BIT_OFFSET (new_field) = bitpos;
8037 SET_DECL_OFFSET_ALIGN (new_field, offset_align);
8038 DECL_SIZE (new_field) = size;
8039 DECL_SIZE_UNIT (new_field)
8040 = convert (sizetype,
8041 size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node));
8042 layout_decl (new_field, DECL_OFFSET_ALIGN (new_field));
8045 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
8046 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
8047 DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field);
8048 TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field);
8053 /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */
8056 get_rep_part (tree record_type)
8058 tree field = TYPE_FIELDS (record_type);
8060 /* The REP part is the first field, internal, another record, and its name
8061 doesn't start with an underscore (i.e. is not generated by the FE). */
8062 if (DECL_INTERNAL_P (field)
8063 && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
8064 && IDENTIFIER_POINTER (DECL_NAME (field)) [0] != '_')
8070 /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */
8073 get_variant_part (tree record_type)
8077 /* The variant part is the only internal field that is a qualified union. */
8078 for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
8079 if (DECL_INTERNAL_P (field)
8080 && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE)
8086 /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is
8087 the list of variants to be used and RECORD_TYPE is the type of the parent.
8088 POS_LIST is a position list describing the layout of fields present in
8089 OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this
8093 create_variant_part_from (tree old_variant_part, tree variant_list,
8094 tree record_type, tree pos_list, tree subst_list)
8096 tree offset = DECL_FIELD_OFFSET (old_variant_part);
8097 tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part);
8098 tree old_union_type = TREE_TYPE (old_variant_part);
8099 tree new_union_type, new_variant_part, t;
8100 tree union_field_list = NULL_TREE;
8102 /* First create the type of the variant part from that of the old one. */
8103 new_union_type = make_node (QUAL_UNION_TYPE);
8104 TYPE_NAME (new_union_type) = DECL_NAME (TYPE_NAME (old_union_type));
8106 /* If the position of the variant part is constant, subtract it from the
8107 size of the type of the parent to get the new size. This manual CSE
8108 reduces the code size when not optimizing. */
8109 if (TREE_CODE (offset) == INTEGER_CST && TREE_CODE (bitpos) == INTEGER_CST)
8111 tree first_bit = bit_from_pos (offset, bitpos);
8112 TYPE_SIZE (new_union_type)
8113 = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit);
8114 TYPE_SIZE_UNIT (new_union_type)
8115 = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type),
8116 byte_from_pos (offset, bitpos));
8117 SET_TYPE_ADA_SIZE (new_union_type,
8118 size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type),
8120 TYPE_ALIGN (new_union_type) = TYPE_ALIGN (old_union_type);
8121 relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY);
8124 copy_and_substitute_in_size (new_union_type, old_union_type, subst_list);
8126 /* Now finish up the new variants and populate the union type. */
8127 for (t = variant_list; t; t = TREE_CHAIN (t))
8129 tree old_field = TREE_VEC_ELT (TREE_VALUE (t), 0), new_field;
8130 tree old_variant, old_variant_subpart, new_variant, field_list;
8132 /* Skip variants that don't belong to this nesting level. */
8133 if (DECL_CONTEXT (old_field) != old_union_type)
8136 /* Retrieve the list of fields already added to the new variant. */
8137 new_variant = TREE_VEC_ELT (TREE_VALUE (t), 2);
8138 field_list = TYPE_FIELDS (new_variant);
8140 /* If the old variant had a variant subpart, we need to create a new
8141 variant subpart and add it to the field list. */
8142 old_variant = TREE_PURPOSE (t);
8143 old_variant_subpart = get_variant_part (old_variant);
8144 if (old_variant_subpart)
8146 tree new_variant_subpart
8147 = create_variant_part_from (old_variant_subpart, variant_list,
8148 new_variant, pos_list, subst_list);
8149 TREE_CHAIN (new_variant_subpart) = field_list;
8150 field_list = new_variant_subpart;
8153 /* Finish up the new variant and create the field. No need for debug
8154 info thanks to the XVS type. */
8155 finish_record_type (new_variant, nreverse (field_list), 2, false);
8156 compute_record_mode (new_variant);
8157 create_type_decl (TYPE_NAME (new_variant), new_variant, NULL,
8158 true, false, Empty);
8161 = create_field_decl_from (old_field, new_variant, new_union_type,
8162 TYPE_SIZE (new_variant),
8163 pos_list, subst_list);
8164 DECL_QUALIFIER (new_field) = TREE_VEC_ELT (TREE_VALUE (t), 1);
8165 DECL_INTERNAL_P (new_field) = 1;
8166 TREE_CHAIN (new_field) = union_field_list;
8167 union_field_list = new_field;
8170 /* Finish up the union type and create the variant part. No need for debug
8171 info thanks to the XVS type. */
8172 finish_record_type (new_union_type, union_field_list, 2, false);
8173 compute_record_mode (new_union_type);
8174 create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL,
8175 true, false, Empty);
8178 = create_field_decl_from (old_variant_part, new_union_type, record_type,
8179 TYPE_SIZE (new_union_type),
8180 pos_list, subst_list);
8181 DECL_INTERNAL_P (new_variant_part) = 1;
8183 /* With multiple discriminants it is possible for an inner variant to be
8184 statically selected while outer ones are not; in this case, the list
8185 of fields of the inner variant is not flattened and we end up with a
8186 qualified union with a single member. Drop the useless container. */
8187 if (!TREE_CHAIN (union_field_list))
8189 DECL_CONTEXT (union_field_list) = record_type;
8190 DECL_FIELD_OFFSET (union_field_list)
8191 = DECL_FIELD_OFFSET (new_variant_part);
8192 DECL_FIELD_BIT_OFFSET (union_field_list)
8193 = DECL_FIELD_BIT_OFFSET (new_variant_part);
8194 SET_DECL_OFFSET_ALIGN (union_field_list,
8195 DECL_OFFSET_ALIGN (new_variant_part));
8196 new_variant_part = union_field_list;
8199 return new_variant_part;
8202 /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE,
8203 which are both RECORD_TYPE, after applying the substitutions described
8207 copy_and_substitute_in_size (tree new_type, tree old_type, tree subst_list)
8211 TYPE_SIZE (new_type) = TYPE_SIZE (old_type);
8212 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type);
8213 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type));
8214 TYPE_ALIGN (new_type) = TYPE_ALIGN (old_type);
8215 relate_alias_sets (new_type, old_type, ALIAS_SET_COPY);
8217 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type)))
8218 for (t = subst_list; t; t = TREE_CHAIN (t))
8219 TYPE_SIZE (new_type)
8220 = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type),
8224 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type)))
8225 for (t = subst_list; t; t = TREE_CHAIN (t))
8226 TYPE_SIZE_UNIT (new_type)
8227 = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type),
8231 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type)))
8232 for (t = subst_list; t; t = TREE_CHAIN (t))
8234 (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type),
8238 /* Finalize the size. */
8239 TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type));
8240 TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type));
8243 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
8244 type with all size expressions that contain F in a PLACEHOLDER_EXPR
8245 updated by replacing F with R.
8247 The function doesn't update the layout of the type, i.e. it assumes
8248 that the substitution is purely formal. That's why the replacement
8249 value R must itself contain a PLACEHOLDER_EXPR. */
8252 substitute_in_type (tree t, tree f, tree r)
8256 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
8258 switch (TREE_CODE (t))
8265 /* First the domain types of arrays. */
8266 if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t))
8267 || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t)))
8269 tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r);
8270 tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r);
8272 if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t))
8276 TYPE_GCC_MIN_VALUE (nt) = low;
8277 TYPE_GCC_MAX_VALUE (nt) = high;
8279 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t))
8281 (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
8286 /* Then the subtypes. */
8287 if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t))
8288 || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t)))
8290 tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r);
8291 tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r);
8293 if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t))
8297 SET_TYPE_RM_MIN_VALUE (nt, low);
8298 SET_TYPE_RM_MAX_VALUE (nt, high);
8306 nt = substitute_in_type (TREE_TYPE (t), f, r);
8307 if (nt == TREE_TYPE (t))
8310 return build_complex_type (nt);
8316 /* These should never show up here. */
8321 tree component = substitute_in_type (TREE_TYPE (t), f, r);
8322 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
8324 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
8327 nt = build_array_type (component, domain);
8328 TYPE_ALIGN (nt) = TYPE_ALIGN (t);
8329 TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t);
8330 SET_TYPE_MODE (nt, TYPE_MODE (t));
8331 TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
8332 TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
8333 TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t);
8334 TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t);
8335 TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t);
8341 case QUAL_UNION_TYPE:
8343 bool changed_field = false;
8346 /* Start out with no fields, make new fields, and chain them
8347 in. If we haven't actually changed the type of any field,
8348 discard everything we've done and return the old type. */
8350 TYPE_FIELDS (nt) = NULL_TREE;
8352 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
8354 tree new_field = copy_node (field), new_n;
8356 new_n = substitute_in_type (TREE_TYPE (field), f, r);
8357 if (new_n != TREE_TYPE (field))
8359 TREE_TYPE (new_field) = new_n;
8360 changed_field = true;
8363 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
8364 if (new_n != DECL_FIELD_OFFSET (field))
8366 DECL_FIELD_OFFSET (new_field) = new_n;
8367 changed_field = true;
8370 /* Do the substitution inside the qualifier, if any. */
8371 if (TREE_CODE (t) == QUAL_UNION_TYPE)
8373 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
8374 if (new_n != DECL_QUALIFIER (field))
8376 DECL_QUALIFIER (new_field) = new_n;
8377 changed_field = true;
8381 DECL_CONTEXT (new_field) = nt;
8382 SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field);
8384 TREE_CHAIN (new_field) = TYPE_FIELDS (nt);
8385 TYPE_FIELDS (nt) = new_field;
8391 TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt));
8392 TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
8393 TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
8394 SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
8403 /* Return the RM size of GNU_TYPE. This is the actual number of bits
8404 needed to represent the object. */
8407 rm_size (tree gnu_type)
8409 /* For integral types, we store the RM size explicitly. */
8410 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
8411 return TYPE_RM_SIZE (gnu_type);
8413 /* Return the RM size of the actual data plus the size of the template. */
8414 if (TREE_CODE (gnu_type) == RECORD_TYPE
8415 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
8417 size_binop (PLUS_EXPR,
8418 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
8419 DECL_SIZE (TYPE_FIELDS (gnu_type)));
8421 /* For record types, we store the size explicitly. */
8422 if ((TREE_CODE (gnu_type) == RECORD_TYPE
8423 || TREE_CODE (gnu_type) == UNION_TYPE
8424 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
8425 && !TYPE_FAT_POINTER_P (gnu_type)
8426 && TYPE_ADA_SIZE (gnu_type))
8427 return TYPE_ADA_SIZE (gnu_type);
8429 /* For other types, this is just the size. */
8430 return TYPE_SIZE (gnu_type);
8433 /* Return the name to be used for GNAT_ENTITY. If a type, create a
8434 fully-qualified name, possibly with type information encoding.
8435 Otherwise, return the name. */
8438 get_entity_name (Entity_Id gnat_entity)
8440 Get_Encoded_Name (gnat_entity);
8441 return get_identifier_with_length (Name_Buffer, Name_Len);
8444 /* Return an identifier representing the external name to be used for
8445 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
8446 and the specified suffix. */
8449 create_concat_name (Entity_Id gnat_entity, const char *suffix)
8451 Entity_Kind kind = Ekind (gnat_entity);
8455 String_Template temp = {1, strlen (suffix)};
8456 Fat_Pointer fp = {suffix, &temp};
8457 Get_External_Name_With_Suffix (gnat_entity, fp);
8460 Get_External_Name (gnat_entity, 0);
8462 /* A variable using the Stdcall convention lives in a DLL. We adjust
8463 its name to use the jump table, the _imp__NAME contains the address
8464 for the NAME variable. */
8465 if ((kind == E_Variable || kind == E_Constant)
8466 && Has_Stdcall_Convention (gnat_entity))
8468 const int len = 6 + Name_Len;
8469 char *new_name = (char *) alloca (len + 1);
8470 strcpy (new_name, "_imp__");
8471 strcat (new_name, Name_Buffer);
8472 return get_identifier_with_length (new_name, len);
8475 return get_identifier_with_length (Name_Buffer, Name_Len);
8478 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
8479 string, return a new IDENTIFIER_NODE that is the concatenation of
8480 the name followed by "___" and the specified suffix. */
8483 concat_name (tree gnu_name, const char *suffix)
8485 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
8486 char *new_name = (char *) alloca (len + 1);
8487 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
8488 strcat (new_name, "___");
8489 strcat (new_name, suffix);
8490 return get_identifier_with_length (new_name, len);
8493 #include "gt-ada-decl.h"
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