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 void components_to_record (tree, Node_Id, tree, int, bool, tree *,
142 bool, bool, bool, bool, bool);
143 static Uint annotate_value (tree);
144 static void annotate_rep (Entity_Id, tree);
145 static tree build_position_list (tree, bool, tree, tree, unsigned int, tree);
146 static tree build_subst_list (Entity_Id, Entity_Id, bool);
147 static tree build_variant_list (tree, tree, tree);
148 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
149 static void set_rm_size (Uint, tree, Entity_Id);
150 static tree make_type_from_size (tree, tree, bool);
151 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
152 static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
153 static void check_ok_for_atomic (tree, Entity_Id, bool);
154 static int compatible_signatures_p (tree, tree);
155 static tree create_field_decl_from (tree, tree, tree, tree, tree, tree);
156 static tree get_rep_part (tree);
157 static tree get_variant_part (tree);
158 static tree create_variant_part_from (tree, tree, tree, tree, tree);
159 static void copy_and_substitute_in_size (tree, tree, tree);
160 static void rest_of_type_decl_compilation_no_defer (tree);
162 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
163 entity, return the equivalent GCC tree for that entity (a ..._DECL node)
164 and associate the ..._DECL node with the input GNAT defining identifier.
166 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
167 initial value (in GCC tree form). This is optional for a variable. For
168 a renamed entity, GNU_EXPR gives the object being renamed.
170 DEFINITION is nonzero if this call is intended for a definition. This is
171 used for separate compilation where it is necessary to know whether an
172 external declaration or a definition must be created if the GCC equivalent
173 was not created previously. The value of 1 is normally used for a nonzero
174 DEFINITION, but a value of 2 is used in special circumstances, defined in
178 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
180 /* Contains the kind of the input GNAT node. */
181 const Entity_Kind kind = Ekind (gnat_entity);
182 /* True if this is a type. */
183 const bool is_type = IN (kind, Type_Kind);
184 /* For a type, contains the equivalent GNAT node to be used in gigi. */
185 Entity_Id gnat_equiv_type = Empty;
186 /* Temporary used to walk the GNAT tree. */
188 /* Contains the GCC DECL node which is equivalent to the input GNAT node.
189 This node will be associated with the GNAT node by calling at the end
190 of the `switch' statement. */
191 tree gnu_decl = NULL_TREE;
192 /* Contains the GCC type to be used for the GCC node. */
193 tree gnu_type = NULL_TREE;
194 /* Contains the GCC size tree to be used for the GCC node. */
195 tree gnu_size = NULL_TREE;
196 /* Contains the GCC name to be used for the GCC node. */
197 tree gnu_entity_name;
198 /* True if we have already saved gnu_decl as a GNAT association. */
200 /* True if we incremented defer_incomplete_level. */
201 bool this_deferred = false;
202 /* True if we incremented force_global. */
203 bool this_global = false;
204 /* True if we should check to see if elaborated during processing. */
205 bool maybe_present = false;
206 /* True if we made GNU_DECL and its type here. */
207 bool this_made_decl = false;
208 /* True if debug info is requested for this entity. */
209 bool debug_info_p = (Needs_Debug_Info (gnat_entity)
210 || debug_info_level == DINFO_LEVEL_VERBOSE);
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. */
986 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
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 constant initialized to a static constant and the
1294 object has an aggregate type, force it to be statically
1295 allocated. This will avoid an initialization copy. */
1296 if (!static_p && const_flag
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)))
1305 gnu_decl = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1306 gnu_expr, const_flag,
1307 Is_Public (gnat_entity),
1308 imported_p || !definition,
1309 static_p, attr_list, gnat_entity);
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 declared in a block that contains a block with an
1380 exception handler, we must force this variable in memory to
1381 suppress an invalid optimization. */
1382 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1383 && Exception_Mechanism != Back_End_Exceptions)
1384 TREE_ADDRESSABLE (gnu_decl) = 1;
1386 /* Back-annotate Esize and Alignment of the object if not already
1387 known. Note that we pick the values of the type, not those of
1388 the object, to shield ourselves from low-level platform-dependent
1389 adjustments like alignment promotion. This is both consistent with
1390 all the treatment above, where alignment and size are set on the
1391 type of the object and not on the object directly, and makes it
1392 possible to support all confirming representation clauses. */
1393 annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size,
1399 /* Return a TYPE_DECL for "void" that we previously made. */
1400 gnu_decl = TYPE_NAME (void_type_node);
1403 case E_Enumeration_Type:
1404 /* A special case: for the types Character and Wide_Character in
1405 Standard, we do not list all the literals. So if the literals
1406 are not specified, make this an unsigned type. */
1407 if (No (First_Literal (gnat_entity)))
1409 gnu_type = make_unsigned_type (esize);
1410 TYPE_NAME (gnu_type) = gnu_entity_name;
1412 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1413 This is needed by the DWARF-2 back-end to distinguish between
1414 unsigned integer types and character types. */
1415 TYPE_STRING_FLAG (gnu_type) = 1;
1420 /* We have a list of enumeral constants in First_Literal. We make a
1421 CONST_DECL for each one and build into GNU_LITERAL_LIST the list to
1422 be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST
1423 whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the
1424 value of the literal. But when we have a regular boolean type, we
1425 simplify this a little by using a BOOLEAN_TYPE. */
1426 bool is_boolean = Is_Boolean_Type (gnat_entity)
1427 && !Has_Non_Standard_Rep (gnat_entity);
1428 tree gnu_literal_list = NULL_TREE;
1429 Entity_Id gnat_literal;
1431 if (Is_Unsigned_Type (gnat_entity))
1432 gnu_type = make_unsigned_type (esize);
1434 gnu_type = make_signed_type (esize);
1436 TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE);
1438 for (gnat_literal = First_Literal (gnat_entity);
1439 Present (gnat_literal);
1440 gnat_literal = Next_Literal (gnat_literal))
1443 = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type);
1445 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1446 gnu_type, gnu_value, true, false, false,
1447 false, NULL, gnat_literal);
1449 save_gnu_tree (gnat_literal, gnu_literal, false);
1450 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1451 gnu_value, gnu_literal_list);
1455 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1457 /* Note that the bounds are updated at the end of this function
1458 to avoid an infinite recursion since they refer to the type. */
1462 case E_Signed_Integer_Type:
1463 case E_Ordinary_Fixed_Point_Type:
1464 case E_Decimal_Fixed_Point_Type:
1465 /* For integer types, just make a signed type the appropriate number
1467 gnu_type = make_signed_type (esize);
1470 case E_Modular_Integer_Type:
1472 /* For modular types, make the unsigned type of the proper number
1473 of bits and then set up the modulus, if required. */
1474 tree gnu_modulus, gnu_high = NULL_TREE;
1476 /* Packed array types are supposed to be subtypes only. */
1477 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1479 gnu_type = make_unsigned_type (esize);
1481 /* Get the modulus in this type. If it overflows, assume it is because
1482 it is equal to 2**Esize. Note that there is no overflow checking
1483 done on unsigned type, so we detect the overflow by looking for
1484 a modulus of zero, which is otherwise invalid. */
1485 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1487 if (!integer_zerop (gnu_modulus))
1489 TYPE_MODULAR_P (gnu_type) = 1;
1490 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1491 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1492 convert (gnu_type, integer_one_node));
1495 /* If the upper bound is not maximal, make an extra subtype. */
1497 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1499 tree gnu_subtype = make_unsigned_type (esize);
1500 SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high);
1501 TREE_TYPE (gnu_subtype) = gnu_type;
1502 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1503 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1504 gnu_type = gnu_subtype;
1509 case E_Signed_Integer_Subtype:
1510 case E_Enumeration_Subtype:
1511 case E_Modular_Integer_Subtype:
1512 case E_Ordinary_Fixed_Point_Subtype:
1513 case E_Decimal_Fixed_Point_Subtype:
1515 /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
1516 not want to call create_range_type since we would like each subtype
1517 node to be distinct. ??? Historically this was in preparation for
1518 when memory aliasing is implemented, but that's obsolete now given
1519 the call to relate_alias_sets below.
1521 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1522 this fact is used by the arithmetic conversion functions.
1524 We elaborate the Ancestor_Subtype if it is not in the current unit
1525 and one of our bounds is non-static. We do this to ensure consistent
1526 naming in the case where several subtypes share the same bounds, by
1527 elaborating the first such subtype first, thus using its name. */
1530 && Present (Ancestor_Subtype (gnat_entity))
1531 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1532 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1533 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1534 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1536 /* Set the precision to the Esize except for bit-packed arrays. */
1537 if (Is_Packed_Array_Type (gnat_entity)
1538 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1539 esize = UI_To_Int (RM_Size (gnat_entity));
1541 /* This should be an unsigned type if the base type is unsigned or
1542 if the lower bound is constant and non-negative or if the type
1544 if (Is_Unsigned_Type (Etype (gnat_entity))
1545 || Is_Unsigned_Type (gnat_entity)
1546 || Has_Biased_Representation (gnat_entity))
1547 gnu_type = make_unsigned_type (esize);
1549 gnu_type = make_signed_type (esize);
1550 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1552 SET_TYPE_RM_MIN_VALUE
1554 convert (TREE_TYPE (gnu_type),
1555 elaborate_expression (Type_Low_Bound (gnat_entity),
1556 gnat_entity, get_identifier ("L"),
1558 Needs_Debug_Info (gnat_entity))));
1560 SET_TYPE_RM_MAX_VALUE
1562 convert (TREE_TYPE (gnu_type),
1563 elaborate_expression (Type_High_Bound (gnat_entity),
1564 gnat_entity, get_identifier ("U"),
1566 Needs_Debug_Info (gnat_entity))));
1568 /* One of the above calls might have caused us to be elaborated,
1569 so don't blow up if so. */
1570 if (present_gnu_tree (gnat_entity))
1572 maybe_present = true;
1576 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1577 = Has_Biased_Representation (gnat_entity);
1579 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
1580 TYPE_STUB_DECL (gnu_type)
1581 = create_type_stub_decl (gnu_entity_name, gnu_type);
1583 /* Inherit our alias set from what we're a subtype of. Subtypes
1584 are not different types and a pointer can designate any instance
1585 within a subtype hierarchy. */
1586 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1588 /* For a packed array, make the original array type a parallel type. */
1590 && Is_Packed_Array_Type (gnat_entity)
1591 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1592 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1594 (Original_Array_Type (gnat_entity)));
1596 /* We have to handle clauses that under-align the type specially. */
1597 if ((Present (Alignment_Clause (gnat_entity))
1598 || (Is_Packed_Array_Type (gnat_entity)
1600 (Alignment_Clause (Original_Array_Type (gnat_entity)))))
1601 && UI_Is_In_Int_Range (Alignment (gnat_entity)))
1603 align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT;
1604 if (align >= TYPE_ALIGN (gnu_type))
1608 /* If the type we are dealing with represents a bit-packed array,
1609 we need to have the bits left justified on big-endian targets
1610 and right justified on little-endian targets. We also need to
1611 ensure that when the value is read (e.g. for comparison of two
1612 such values), we only get the good bits, since the unused bits
1613 are uninitialized. Both goals are accomplished by wrapping up
1614 the modular type in an enclosing record type. */
1615 if (Is_Packed_Array_Type (gnat_entity)
1616 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1618 tree gnu_field_type, gnu_field;
1620 /* Set the RM size before wrapping up the original type. */
1621 SET_TYPE_RM_SIZE (gnu_type,
1622 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1623 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1625 /* Create a stripped-down declaration, mainly for debugging. */
1626 create_type_decl (gnu_entity_name, gnu_type, NULL, true,
1627 debug_info_p, gnat_entity);
1629 /* Now save it and build the enclosing record type. */
1630 gnu_field_type = gnu_type;
1632 gnu_type = make_node (RECORD_TYPE);
1633 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1634 TYPE_PACKED (gnu_type) = 1;
1635 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
1636 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
1637 SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
1639 /* Propagate the alignment of the modular type to the record type,
1640 unless there is an alignment clause that under-aligns the type.
1641 This means that bit-packed arrays are given "ceil" alignment for
1642 their size by default, which may seem counter-intuitive but makes
1643 it possible to overlay them on modular types easily. */
1644 TYPE_ALIGN (gnu_type)
1645 = align > 0 ? align : TYPE_ALIGN (gnu_field_type);
1647 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1649 /* Don't notify the field as "addressable", since we won't be taking
1650 it's address and it would prevent create_field_decl from making a
1652 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1653 gnu_field_type, gnu_type, 1,
1654 NULL_TREE, bitsize_zero_node, 0);
1656 /* Do not emit debug info until after the parallel type is added. */
1657 finish_record_type (gnu_type, gnu_field, 2, false);
1658 compute_record_mode (gnu_type);
1659 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1663 /* Make the original array type a parallel type. */
1664 if (present_gnu_tree (Original_Array_Type (gnat_entity)))
1665 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1667 (Original_Array_Type (gnat_entity)));
1669 rest_of_record_type_compilation (gnu_type);
1673 /* If the type we are dealing with has got a smaller alignment than the
1674 natural one, we need to wrap it up in a record type and under-align
1675 the latter. We reuse the padding machinery for this purpose. */
1678 tree gnu_field_type, gnu_field;
1680 /* Set the RM size before wrapping up the type. */
1681 SET_TYPE_RM_SIZE (gnu_type,
1682 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1684 /* Create a stripped-down declaration, mainly for debugging. */
1685 create_type_decl (gnu_entity_name, gnu_type, NULL, true,
1686 debug_info_p, gnat_entity);
1688 /* Now save it and build the enclosing record type. */
1689 gnu_field_type = gnu_type;
1691 gnu_type = make_node (RECORD_TYPE);
1692 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1693 TYPE_PACKED (gnu_type) = 1;
1694 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
1695 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
1696 SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
1697 TYPE_ALIGN (gnu_type) = align;
1698 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1700 /* Don't notify the field as "addressable", since we won't be taking
1701 it's address and it would prevent create_field_decl from making a
1703 gnu_field = create_field_decl (get_identifier ("F"),
1704 gnu_field_type, gnu_type, 1,
1705 NULL_TREE, bitsize_zero_node, 0);
1707 finish_record_type (gnu_type, gnu_field, 2, debug_info_p);
1708 compute_record_mode (gnu_type);
1709 TYPE_PADDING_P (gnu_type) = 1;
1714 case E_Floating_Point_Type:
1715 /* If this is a VAX floating-point type, use an integer of the proper
1716 size. All the operations will be handled with ASM statements. */
1717 if (Vax_Float (gnat_entity))
1719 gnu_type = make_signed_type (esize);
1720 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1721 SET_TYPE_DIGITS_VALUE (gnu_type,
1722 UI_To_gnu (Digits_Value (gnat_entity),
1727 /* The type of the Low and High bounds can be our type if this is
1728 a type from Standard, so set them at the end of the function. */
1729 gnu_type = make_node (REAL_TYPE);
1730 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1731 layout_type (gnu_type);
1734 case E_Floating_Point_Subtype:
1735 if (Vax_Float (gnat_entity))
1737 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1743 && Present (Ancestor_Subtype (gnat_entity))
1744 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1745 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1746 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1747 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1750 gnu_type = make_node (REAL_TYPE);
1751 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1752 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1753 TYPE_GCC_MIN_VALUE (gnu_type)
1754 = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type));
1755 TYPE_GCC_MAX_VALUE (gnu_type)
1756 = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type));
1757 layout_type (gnu_type);
1759 SET_TYPE_RM_MIN_VALUE
1761 convert (TREE_TYPE (gnu_type),
1762 elaborate_expression (Type_Low_Bound (gnat_entity),
1763 gnat_entity, get_identifier ("L"),
1765 Needs_Debug_Info (gnat_entity))));
1767 SET_TYPE_RM_MAX_VALUE
1769 convert (TREE_TYPE (gnu_type),
1770 elaborate_expression (Type_High_Bound (gnat_entity),
1771 gnat_entity, get_identifier ("U"),
1773 Needs_Debug_Info (gnat_entity))));
1775 /* One of the above calls might have caused us to be elaborated,
1776 so don't blow up if so. */
1777 if (present_gnu_tree (gnat_entity))
1779 maybe_present = true;
1783 /* Inherit our alias set from what we're a subtype of, as for
1784 integer subtypes. */
1785 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1789 /* Array and String Types and Subtypes
1791 Unconstrained array types are represented by E_Array_Type and
1792 constrained array types are represented by E_Array_Subtype. There
1793 are no actual objects of an unconstrained array type; all we have
1794 are pointers to that type.
1796 The following fields are defined on array types and subtypes:
1798 Component_Type Component type of the array.
1799 Number_Dimensions Number of dimensions (an int).
1800 First_Index Type of first index. */
1805 Entity_Id gnat_index, gnat_name;
1806 const bool convention_fortran_p
1807 = (Convention (gnat_entity) == Convention_Fortran);
1808 const int ndim = Number_Dimensions (gnat_entity);
1809 tree gnu_template_fields = NULL_TREE;
1810 tree gnu_template_type = make_node (RECORD_TYPE);
1811 tree gnu_template_reference;
1812 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1813 tree gnu_fat_type = make_node (RECORD_TYPE);
1814 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
1815 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree));
1816 tree gnu_max_size = size_one_node, gnu_max_size_unit, tem;
1819 TYPE_NAME (gnu_template_type)
1820 = create_concat_name (gnat_entity, "XUB");
1822 /* Make a node for the array. If we are not defining the array
1823 suppress expanding incomplete types. */
1824 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1828 defer_incomplete_level++;
1829 this_deferred = true;
1832 /* Build the fat pointer type. Use a "void *" object instead of
1833 a pointer to the array type since we don't have the array type
1834 yet (it will reference the fat pointer via the bounds). */
1835 tem = chainon (chainon (NULL_TREE,
1836 create_field_decl (get_identifier ("P_ARRAY"),
1839 NULL_TREE, NULL_TREE, 0)),
1840 create_field_decl (get_identifier ("P_BOUNDS"),
1843 NULL_TREE, NULL_TREE, 0));
1845 /* Make sure we can put this into a register. */
1846 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1848 /* Do not emit debug info for this record type since the types of its
1849 fields are still incomplete at this point. */
1850 finish_record_type (gnu_fat_type, tem, 0, false);
1851 TYPE_FAT_POINTER_P (gnu_fat_type) = 1;
1853 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1854 is the fat pointer. This will be used to access the individual
1855 fields once we build them. */
1856 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1857 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1858 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1859 gnu_template_reference
1860 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1861 TREE_READONLY (gnu_template_reference) = 1;
1863 /* Now create the GCC type for each index and add the fields for that
1864 index to the template. */
1865 for (index = (convention_fortran_p ? ndim - 1 : 0),
1866 gnat_index = First_Index (gnat_entity);
1867 0 <= index && index < ndim;
1868 index += (convention_fortran_p ? - 1 : 1),
1869 gnat_index = Next_Index (gnat_index))
1871 char field_name[16];
1872 tree gnu_index_base_type
1873 = get_unpadded_type (Base_Type (Etype (gnat_index)));
1874 tree gnu_low_field, gnu_high_field, gnu_low, gnu_high, gnu_max;
1876 /* Make the FIELD_DECLs for the low and high bounds of this
1877 type and then make extractions of these fields from the
1879 sprintf (field_name, "LB%d", index);
1880 gnu_low_field = create_field_decl (get_identifier (field_name),
1881 gnu_index_base_type,
1882 gnu_template_type, 0,
1883 NULL_TREE, NULL_TREE, 0);
1884 Sloc_to_locus (Sloc (gnat_entity),
1885 &DECL_SOURCE_LOCATION (gnu_low_field));
1887 field_name[0] = 'U';
1888 gnu_high_field = create_field_decl (get_identifier (field_name),
1889 gnu_index_base_type,
1890 gnu_template_type, 0,
1891 NULL_TREE, NULL_TREE, 0);
1892 Sloc_to_locus (Sloc (gnat_entity),
1893 &DECL_SOURCE_LOCATION (gnu_high_field));
1895 gnu_temp_fields[index] = chainon (gnu_low_field, gnu_high_field);
1897 /* We can't use build_component_ref here since the template type
1898 isn't complete yet. */
1899 gnu_low = build3 (COMPONENT_REF, gnu_index_base_type,
1900 gnu_template_reference, gnu_low_field,
1902 gnu_high = build3 (COMPONENT_REF, gnu_index_base_type,
1903 gnu_template_reference, gnu_high_field,
1905 TREE_READONLY (gnu_low) = TREE_READONLY (gnu_high) = 1;
1907 /* Compute the size of this dimension. */
1909 = build3 (COND_EXPR, gnu_index_base_type,
1910 build2 (GE_EXPR, integer_type_node, gnu_high, gnu_low),
1912 build2 (MINUS_EXPR, gnu_index_base_type,
1913 gnu_low, fold_convert (gnu_index_base_type,
1914 integer_one_node)));
1916 /* Make a range type with the new range in the Ada base type.
1917 Then make an index type with the size range in sizetype. */
1918 gnu_index_types[index]
1919 = create_index_type (convert (sizetype, gnu_low),
1920 convert (sizetype, gnu_max),
1921 create_range_type (gnu_index_base_type,
1925 /* Update the maximum size of the array in elements. */
1928 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
1930 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type));
1932 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type));
1934 = size_binop (MAX_EXPR,
1935 size_binop (PLUS_EXPR, size_one_node,
1936 size_binop (MINUS_EXPR,
1940 if (TREE_CODE (gnu_this_max) == INTEGER_CST
1941 && TREE_OVERFLOW (gnu_this_max))
1942 gnu_max_size = NULL_TREE;
1945 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
1948 TYPE_NAME (gnu_index_types[index])
1949 = create_concat_name (gnat_entity, field_name);
1952 for (index = 0; index < ndim; index++)
1954 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1956 /* Install all the fields into the template. */
1957 finish_record_type (gnu_template_type, gnu_template_fields, 0,
1959 TYPE_READONLY (gnu_template_type) = 1;
1961 /* Now make the array of arrays and update the pointer to the array
1962 in the fat pointer. Note that it is the first field. */
1963 tem = gnat_to_gnu_component_type (gnat_entity, definition,
1966 /* If Component_Size is not already specified, annotate it with the
1967 size of the component. */
1968 if (Unknown_Component_Size (gnat_entity))
1969 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1971 /* Compute the maximum size of the array in units and bits. */
1974 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
1975 TYPE_SIZE_UNIT (tem));
1976 gnu_max_size = size_binop (MULT_EXPR,
1977 convert (bitsizetype, gnu_max_size),
1981 gnu_max_size_unit = NULL_TREE;
1983 /* Now build the array type. */
1984 for (index = ndim - 1; index >= 0; index--)
1986 tem = build_array_type (tem, gnu_index_types[index]);
1987 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1988 if (array_type_has_nonaliased_component (tem, gnat_entity))
1989 TYPE_NONALIASED_COMPONENT (tem) = 1;
1992 /* If an alignment is specified, use it if valid. But ignore it
1993 for the original type of packed array types. If the alignment
1994 was requested with an explicit alignment clause, state so. */
1995 if (No (Packed_Array_Type (gnat_entity))
1996 && Known_Alignment (gnat_entity))
1999 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2001 if (Present (Alignment_Clause (gnat_entity)))
2002 TYPE_USER_ALIGN (tem) = 1;
2005 TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p;
2006 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2008 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2009 corresponding fat pointer. */
2010 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2011 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2012 SET_TYPE_MODE (gnu_type, BLKmode);
2013 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2014 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2016 /* If the maximum size doesn't overflow, use it. */
2018 && TREE_CODE (gnu_max_size) == INTEGER_CST
2019 && !TREE_OVERFLOW (gnu_max_size)
2020 && TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2021 && !TREE_OVERFLOW (gnu_max_size_unit))
2023 TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size,
2025 TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit,
2026 TYPE_SIZE_UNIT (tem));
2029 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2030 tem, NULL, !Comes_From_Source (gnat_entity),
2031 debug_info_p, gnat_entity);
2033 /* Give the fat pointer type a name. If this is a packed type, tell
2034 the debugger how to interpret the underlying bits. */
2035 if (Present (Packed_Array_Type (gnat_entity)))
2036 gnat_name = Packed_Array_Type (gnat_entity);
2038 gnat_name = gnat_entity;
2039 create_type_decl (create_concat_name (gnat_name, "XUP"),
2040 gnu_fat_type, NULL, true,
2041 debug_info_p, gnat_entity);
2043 /* Create the type to be used as what a thin pointer designates: an
2044 record type for the object and its template with the field offsets
2045 shifted to have the template at a negative offset. */
2046 tem = build_unc_object_type (gnu_template_type, tem,
2047 create_concat_name (gnat_name, "XUT"));
2048 shift_unc_components_for_thin_pointers (tem);
2050 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2051 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2055 case E_String_Subtype:
2056 case E_Array_Subtype:
2058 /* This is the actual data type for array variables. Multidimensional
2059 arrays are implemented as arrays of arrays. Note that arrays which
2060 have sparse enumeration subtypes as index components create sparse
2061 arrays, which is obviously space inefficient but so much easier to
2064 Also note that the subtype never refers to the unconstrained array
2065 type, which is somewhat at variance with Ada semantics.
2067 First check to see if this is simply a renaming of the array type.
2068 If so, the result is the array type. */
2070 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2071 if (!Is_Constrained (gnat_entity))
2075 Entity_Id gnat_index, gnat_base_index;
2076 const bool convention_fortran_p
2077 = (Convention (gnat_entity) == Convention_Fortran);
2078 const int ndim = Number_Dimensions (gnat_entity);
2079 tree gnu_base_type = gnu_type;
2080 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
2081 tree gnu_max_size = size_one_node, gnu_max_size_unit;
2082 bool need_index_type_struct = false;
2085 /* First create the GCC type for each index and find out whether
2086 special types are needed for debugging information. */
2087 for (index = (convention_fortran_p ? ndim - 1 : 0),
2088 gnat_index = First_Index (gnat_entity),
2090 = First_Index (Implementation_Base_Type (gnat_entity));
2091 0 <= index && index < ndim;
2092 index += (convention_fortran_p ? - 1 : 1),
2093 gnat_index = Next_Index (gnat_index),
2094 gnat_base_index = Next_Index (gnat_base_index))
2096 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
2098 = compare_tree_int (TYPE_RM_SIZE (gnu_index_type),
2099 TYPE_PRECISION (sizetype));
2100 const bool subrange_p = (prec_comp < 0)
2102 && TYPE_UNSIGNED (gnu_index_type)
2103 == TYPE_UNSIGNED (sizetype));
2104 const bool wider_p = (prec_comp > 0);
2105 tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type);
2106 tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type);
2107 tree gnu_min = convert (sizetype, gnu_orig_min);
2108 tree gnu_max = convert (sizetype, gnu_orig_max);
2109 tree gnu_base_index_type
2110 = get_unpadded_type (Etype (gnat_base_index));
2111 tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type);
2112 tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type);
2113 tree gnu_high, gnu_low;
2115 /* See if the base array type is already flat. If it is, we
2116 are probably compiling an ACATS test but it will cause the
2117 code below to malfunction if we don't handle it specially. */
2118 if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST
2119 && TREE_CODE (gnu_base_orig_max) == INTEGER_CST
2120 && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min))
2122 gnu_min = size_one_node;
2123 gnu_max = size_zero_node;
2127 /* Similarly, if one of the values overflows in sizetype and the
2128 range is null, use 1..0 for the sizetype bounds. */
2129 else if (!subrange_p
2130 && TREE_CODE (gnu_min) == INTEGER_CST
2131 && TREE_CODE (gnu_max) == INTEGER_CST
2132 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2133 && tree_int_cst_lt (gnu_orig_max, gnu_orig_min))
2135 gnu_min = size_one_node;
2136 gnu_max = size_zero_node;
2140 /* If the minimum and maximum values both overflow in sizetype,
2141 but the difference in the original type does not overflow in
2142 sizetype, ignore the overflow indication. */
2143 else if (!subrange_p
2144 && TREE_CODE (gnu_min) == INTEGER_CST
2145 && TREE_CODE (gnu_max) == INTEGER_CST
2146 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2149 fold_build2 (MINUS_EXPR, gnu_index_type,
2153 TREE_OVERFLOW (gnu_min) = 0;
2154 TREE_OVERFLOW (gnu_max) = 0;
2158 /* Compute the size of this dimension in the general case. We
2159 need to provide GCC with an upper bound to use but have to
2160 deal with the "superflat" case. There are three ways to do
2161 this. If we can prove that the array can never be superflat,
2162 we can just use the high bound of the index type. */
2163 else if (Nkind (gnat_index) == N_Range
2164 && cannot_be_superflat_p (gnat_index))
2167 /* Otherwise, if we can prove that the low bound minus one and
2168 the high bound cannot overflow, we can just use the expression
2169 MAX (hb, lb - 1). Similarly, if we can prove that the high
2170 bound plus one and the low bound cannot overflow, we can use
2171 the high bound as-is and MIN (hb + 1, lb) for the low bound.
2172 Otherwise, we have to fall back to the most general expression
2173 (hb >= lb) ? hb : lb - 1. Note that the comparison must be
2174 done in the original index type, to avoid any overflow during
2178 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2179 gnu_low = size_binop (PLUS_EXPR, gnu_max, size_one_node);
2181 /* If gnu_high is a constant that has overflowed, the low
2182 bound is the smallest integer so cannot be the maximum.
2183 If gnu_low is a constant that has overflowed, the high
2184 bound is the highest integer so cannot be the minimum. */
2185 if ((TREE_CODE (gnu_high) == INTEGER_CST
2186 && TREE_OVERFLOW (gnu_high))
2187 || (TREE_CODE (gnu_low) == INTEGER_CST
2188 && TREE_OVERFLOW (gnu_low)))
2191 /* If the index type is a subrange and gnu_high a constant
2192 that hasn't overflowed, we can use the maximum. */
2193 else if (subrange_p && TREE_CODE (gnu_high) == INTEGER_CST)
2194 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2196 /* If the index type is a subrange and gnu_low a constant
2197 that hasn't overflowed, we can use the minimum. */
2198 else if (subrange_p && TREE_CODE (gnu_low) == INTEGER_CST)
2201 gnu_min = size_binop (MIN_EXPR, gnu_min, gnu_low);
2206 = build_cond_expr (sizetype,
2207 build_binary_op (GE_EXPR,
2214 gnu_index_types[index]
2215 = create_index_type (gnu_min, gnu_high, gnu_index_type,
2218 /* Update the maximum size of the array in elements. Here we
2219 see if any constraint on the index type of the base type
2220 can be used in the case of self-referential bound on the
2221 index type of the subtype. We look for a non-"infinite"
2222 and non-self-referential bound from any type involved and
2223 handle each bound separately. */
2226 tree gnu_base_min = convert (sizetype, gnu_base_orig_min);
2227 tree gnu_base_max = convert (sizetype, gnu_base_orig_max);
2228 tree gnu_base_index_base_type
2229 = get_base_type (gnu_base_index_type);
2230 tree gnu_base_base_min
2231 = convert (sizetype,
2232 TYPE_MIN_VALUE (gnu_base_index_base_type));
2233 tree gnu_base_base_max
2234 = convert (sizetype,
2235 TYPE_MAX_VALUE (gnu_base_index_base_type));
2237 if (!CONTAINS_PLACEHOLDER_P (gnu_min)
2238 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2239 && !TREE_OVERFLOW (gnu_base_min)))
2240 gnu_base_min = gnu_min;
2242 if (!CONTAINS_PLACEHOLDER_P (gnu_max)
2243 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2244 && !TREE_OVERFLOW (gnu_base_max)))
2245 gnu_base_max = gnu_max;
2247 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2248 && TREE_OVERFLOW (gnu_base_min))
2249 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2250 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2251 && TREE_OVERFLOW (gnu_base_max))
2252 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2253 gnu_max_size = NULL_TREE;
2257 = size_binop (MAX_EXPR,
2258 size_binop (PLUS_EXPR, size_one_node,
2259 size_binop (MINUS_EXPR,
2264 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2265 && TREE_OVERFLOW (gnu_this_max))
2266 gnu_max_size = NULL_TREE;
2269 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2273 /* We need special types for debugging information to point to
2274 the index types if they have variable bounds, are not integer
2275 types, are biased or are wider than sizetype. */
2276 if (!integer_onep (gnu_orig_min)
2277 || TREE_CODE (gnu_orig_max) != INTEGER_CST
2278 || TREE_CODE (gnu_index_type) != INTEGER_TYPE
2279 || (TREE_TYPE (gnu_index_type)
2280 && TREE_CODE (TREE_TYPE (gnu_index_type))
2282 || TYPE_BIASED_REPRESENTATION_P (gnu_index_type)
2284 need_index_type_struct = true;
2287 /* Then flatten: create the array of arrays. For an array type
2288 used to implement a packed array, get the component type from
2289 the original array type since the representation clauses that
2290 can affect it are on the latter. */
2291 if (Is_Packed_Array_Type (gnat_entity)
2292 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2294 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2295 for (index = ndim - 1; index >= 0; index--)
2296 gnu_type = TREE_TYPE (gnu_type);
2298 /* One of the above calls might have caused us to be elaborated,
2299 so don't blow up if so. */
2300 if (present_gnu_tree (gnat_entity))
2302 maybe_present = true;
2308 gnu_type = gnat_to_gnu_component_type (gnat_entity, definition,
2311 /* One of the above calls might have caused us to be elaborated,
2312 so don't blow up if so. */
2313 if (present_gnu_tree (gnat_entity))
2315 maybe_present = true;
2320 /* Compute the maximum size of the array in units and bits. */
2323 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2324 TYPE_SIZE_UNIT (gnu_type));
2325 gnu_max_size = size_binop (MULT_EXPR,
2326 convert (bitsizetype, gnu_max_size),
2327 TYPE_SIZE (gnu_type));
2330 gnu_max_size_unit = NULL_TREE;
2332 /* Now build the array type. */
2333 for (index = ndim - 1; index >= 0; index --)
2335 gnu_type = build_array_type (gnu_type, gnu_index_types[index]);
2336 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2337 if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
2338 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2341 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2342 TYPE_STUB_DECL (gnu_type)
2343 = create_type_stub_decl (gnu_entity_name, gnu_type);
2345 /* If we are at file level and this is a multi-dimensional array,
2346 we need to make a variable corresponding to the stride of the
2347 inner dimensions. */
2348 if (global_bindings_p () && ndim > 1)
2350 tree gnu_str_name = get_identifier ("ST");
2353 for (gnu_arr_type = TREE_TYPE (gnu_type);
2354 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2355 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2356 gnu_str_name = concat_name (gnu_str_name, "ST"))
2358 tree eltype = TREE_TYPE (gnu_arr_type);
2360 TYPE_SIZE (gnu_arr_type)
2361 = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type),
2362 gnat_entity, gnu_str_name,
2365 /* ??? For now, store the size as a multiple of the
2366 alignment of the element type in bytes so that we
2367 can see the alignment from the tree. */
2368 TYPE_SIZE_UNIT (gnu_arr_type)
2370 (MULT_EXPR, sizetype,
2371 elaborate_expression_1
2372 (build_binary_op (EXACT_DIV_EXPR, sizetype,
2373 TYPE_SIZE_UNIT (gnu_arr_type),
2374 size_int (TYPE_ALIGN (eltype)
2376 gnat_entity, concat_name (gnu_str_name, "A_U"),
2378 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2380 /* ??? create_type_decl is not invoked on the inner types so
2381 the MULT_EXPR node built above will never be marked. */
2382 MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type));
2386 /* If we need to write out a record type giving the names of the
2387 bounds for debugging purposes, do it now and make the record
2388 type a parallel type. This is not needed for a packed array
2389 since the bounds are conveyed by the original array type. */
2390 if (need_index_type_struct
2392 && !Is_Packed_Array_Type (gnat_entity))
2394 tree gnu_bound_rec = make_node (RECORD_TYPE);
2395 tree gnu_field_list = NULL_TREE;
2398 TYPE_NAME (gnu_bound_rec)
2399 = create_concat_name (gnat_entity, "XA");
2401 for (index = ndim - 1; index >= 0; index--)
2403 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]);
2404 tree gnu_index_name = TYPE_NAME (gnu_index);
2406 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2407 gnu_index_name = DECL_NAME (gnu_index_name);
2409 /* Make sure to reference the types themselves, and not just
2410 their names, as the debugger may fall back on them. */
2411 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2413 0, NULL_TREE, NULL_TREE, 0);
2414 TREE_CHAIN (gnu_field) = gnu_field_list;
2415 gnu_field_list = gnu_field;
2418 finish_record_type (gnu_bound_rec, gnu_field_list, 0, true);
2419 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2422 /* Otherwise, for a packed array, make the original array type a
2424 else if (debug_info_p
2425 && Is_Packed_Array_Type (gnat_entity)
2426 && present_gnu_tree (Original_Array_Type (gnat_entity)))
2427 add_parallel_type (TYPE_STUB_DECL (gnu_type),
2429 (Original_Array_Type (gnat_entity)));
2431 TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p;
2432 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2433 = (Is_Packed_Array_Type (gnat_entity)
2434 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2436 /* If the size is self-referential and the maximum size doesn't
2437 overflow, use it. */
2438 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2440 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2441 && TREE_OVERFLOW (gnu_max_size))
2442 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2443 && TREE_OVERFLOW (gnu_max_size_unit)))
2445 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2446 TYPE_SIZE (gnu_type));
2447 TYPE_SIZE_UNIT (gnu_type)
2448 = size_binop (MIN_EXPR, gnu_max_size_unit,
2449 TYPE_SIZE_UNIT (gnu_type));
2452 /* Set our alias set to that of our base type. This gives all
2453 array subtypes the same alias set. */
2454 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2456 /* If this is a packed type, make this type the same as the packed
2457 array type, but do some adjusting in the type first. */
2458 if (Present (Packed_Array_Type (gnat_entity)))
2460 Entity_Id gnat_index;
2463 /* First finish the type we had been making so that we output
2464 debugging information for it. */
2465 if (Treat_As_Volatile (gnat_entity))
2467 = build_qualified_type (gnu_type,
2468 TYPE_QUALS (gnu_type)
2469 | TYPE_QUAL_VOLATILE);
2471 /* Make it artificial only if the base type was artificial too.
2472 That's sort of "morally" true and will make it possible for
2473 the debugger to look it up by name in DWARF, which is needed
2474 in order to decode the packed array type. */
2476 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2477 !Comes_From_Source (Etype (gnat_entity))
2478 && !Comes_From_Source (gnat_entity),
2479 debug_info_p, gnat_entity);
2481 /* Save it as our equivalent in case the call below elaborates
2483 save_gnu_tree (gnat_entity, gnu_decl, false);
2485 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2487 this_made_decl = true;
2488 gnu_type = TREE_TYPE (gnu_decl);
2489 save_gnu_tree (gnat_entity, NULL_TREE, false);
2491 gnu_inner = gnu_type;
2492 while (TREE_CODE (gnu_inner) == RECORD_TYPE
2493 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner)
2494 || TYPE_PADDING_P (gnu_inner)))
2495 gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner));
2497 /* We need to attach the index type to the type we just made so
2498 that the actual bounds can later be put into a template. */
2499 if ((TREE_CODE (gnu_inner) == ARRAY_TYPE
2500 && !TYPE_ACTUAL_BOUNDS (gnu_inner))
2501 || (TREE_CODE (gnu_inner) == INTEGER_TYPE
2502 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner)))
2504 if (TREE_CODE (gnu_inner) == INTEGER_TYPE)
2506 /* The TYPE_ACTUAL_BOUNDS field is overloaded with the
2507 TYPE_MODULUS for modular types so we make an extra
2508 subtype if necessary. */
2509 if (TYPE_MODULAR_P (gnu_inner))
2512 = make_unsigned_type (TYPE_PRECISION (gnu_inner));
2513 TREE_TYPE (gnu_subtype) = gnu_inner;
2514 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2515 SET_TYPE_RM_MIN_VALUE (gnu_subtype,
2516 TYPE_MIN_VALUE (gnu_inner));
2517 SET_TYPE_RM_MAX_VALUE (gnu_subtype,
2518 TYPE_MAX_VALUE (gnu_inner));
2519 gnu_inner = gnu_subtype;
2522 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1;
2524 #ifdef ENABLE_CHECKING
2525 /* Check for other cases of overloading. */
2526 gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner));
2530 for (gnat_index = First_Index (gnat_entity);
2531 Present (gnat_index);
2532 gnat_index = Next_Index (gnat_index))
2533 SET_TYPE_ACTUAL_BOUNDS
2535 tree_cons (NULL_TREE,
2536 get_unpadded_type (Etype (gnat_index)),
2537 TYPE_ACTUAL_BOUNDS (gnu_inner)));
2539 if (Convention (gnat_entity) != Convention_Fortran)
2540 SET_TYPE_ACTUAL_BOUNDS
2541 (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner)));
2543 if (TREE_CODE (gnu_type) == RECORD_TYPE
2544 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2545 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner;
2550 /* Abort if packed array with no Packed_Array_Type field set. */
2551 gcc_assert (!Is_Packed (gnat_entity));
2555 case E_String_Literal_Subtype:
2556 /* Create the type for a string literal. */
2558 Entity_Id gnat_full_type
2559 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2560 && Present (Full_View (Etype (gnat_entity)))
2561 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2562 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2563 tree gnu_string_array_type
2564 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2565 tree gnu_string_index_type
2566 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2567 (TYPE_DOMAIN (gnu_string_array_type))));
2568 tree gnu_lower_bound
2569 = convert (gnu_string_index_type,
2570 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2571 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2572 tree gnu_length = ssize_int (length - 1);
2573 tree gnu_upper_bound
2574 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2576 convert (gnu_string_index_type, gnu_length));
2578 = create_index_type (convert (sizetype, gnu_lower_bound),
2579 convert (sizetype, gnu_upper_bound),
2580 create_range_type (gnu_string_index_type,
2586 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2588 if (array_type_has_nonaliased_component (gnu_type, gnat_entity))
2589 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2590 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2594 /* Record Types and Subtypes
2596 The following fields are defined on record types:
2598 Has_Discriminants True if the record has discriminants
2599 First_Discriminant Points to head of list of discriminants
2600 First_Entity Points to head of list of fields
2601 Is_Tagged_Type True if the record is tagged
2603 Implementation of Ada records and discriminated records:
2605 A record type definition is transformed into the equivalent of a C
2606 struct definition. The fields that are the discriminants which are
2607 found in the Full_Type_Declaration node and the elements of the
2608 Component_List found in the Record_Type_Definition node. The
2609 Component_List can be a recursive structure since each Variant of
2610 the Variant_Part of the Component_List has a Component_List.
2612 Processing of a record type definition comprises starting the list of
2613 field declarations here from the discriminants and the calling the
2614 function components_to_record to add the rest of the fields from the
2615 component list and return the gnu type node. The function
2616 components_to_record will call itself recursively as it traverses
2620 if (Has_Complex_Representation (gnat_entity))
2623 = build_complex_type
2625 (Etype (Defining_Entity
2626 (First (Component_Items
2629 (Declaration_Node (gnat_entity)))))))));
2635 Node_Id full_definition = Declaration_Node (gnat_entity);
2636 Node_Id record_definition = Type_Definition (full_definition);
2637 Entity_Id gnat_field;
2638 tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent;
2639 /* Set PACKED in keeping with gnat_to_gnu_field. */
2641 = Is_Packed (gnat_entity)
2643 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2645 : (Known_Alignment (gnat_entity)
2646 || (Strict_Alignment (gnat_entity)
2647 && Known_Static_Esize (gnat_entity)))
2650 bool has_discr = Has_Discriminants (gnat_entity);
2651 bool has_rep = Has_Specified_Layout (gnat_entity);
2652 bool all_rep = has_rep;
2654 = (Is_Tagged_Type (gnat_entity)
2655 && Nkind (record_definition) == N_Derived_Type_Definition);
2656 bool is_unchecked_union = Is_Unchecked_Union (gnat_entity);
2658 /* See if all fields have a rep clause. Stop when we find one
2661 for (gnat_field = First_Entity (gnat_entity);
2662 Present (gnat_field);
2663 gnat_field = Next_Entity (gnat_field))
2664 if ((Ekind (gnat_field) == E_Component
2665 || Ekind (gnat_field) == E_Discriminant)
2666 && No (Component_Clause (gnat_field)))
2672 /* If this is a record extension, go a level further to find the
2673 record definition. Also, verify we have a Parent_Subtype. */
2676 if (!type_annotate_only
2677 || Present (Record_Extension_Part (record_definition)))
2678 record_definition = Record_Extension_Part (record_definition);
2680 gcc_assert (type_annotate_only
2681 || Present (Parent_Subtype (gnat_entity)));
2684 /* Make a node for the record. If we are not defining the record,
2685 suppress expanding incomplete types. */
2686 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2687 TYPE_NAME (gnu_type) = gnu_entity_name;
2688 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2692 defer_incomplete_level++;
2693 this_deferred = true;
2696 /* If both a size and rep clause was specified, put the size in
2697 the record type now so that it can get the proper mode. */
2698 if (has_rep && Known_Esize (gnat_entity))
2699 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2701 /* Always set the alignment here so that it can be used to
2702 set the mode, if it is making the alignment stricter. If
2703 it is invalid, it will be checked again below. If this is to
2704 be Atomic, choose a default alignment of a word unless we know
2705 the size and it's smaller. */
2706 if (Known_Alignment (gnat_entity))
2707 TYPE_ALIGN (gnu_type)
2708 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2709 else if (Is_Atomic (gnat_entity))
2710 TYPE_ALIGN (gnu_type)
2711 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2712 /* If a type needs strict alignment, the minimum size will be the
2713 type size instead of the RM size (see validate_size). Cap the
2714 alignment, lest it causes this type size to become too large. */
2715 else if (Strict_Alignment (gnat_entity)
2716 && Known_Static_Esize (gnat_entity))
2718 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2719 unsigned int raw_align = raw_size & -raw_size;
2720 if (raw_align < BIGGEST_ALIGNMENT)
2721 TYPE_ALIGN (gnu_type) = raw_align;
2724 TYPE_ALIGN (gnu_type) = 0;
2726 /* If we have a Parent_Subtype, make a field for the parent. If
2727 this record has rep clauses, force the position to zero. */
2728 if (Present (Parent_Subtype (gnat_entity)))
2730 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2733 /* A major complexity here is that the parent subtype will
2734 reference our discriminants in its Discriminant_Constraint
2735 list. But those must reference the parent component of this
2736 record which is of the parent subtype we have not built yet!
2737 To break the circle we first build a dummy COMPONENT_REF which
2738 represents the "get to the parent" operation and initialize
2739 each of those discriminants to a COMPONENT_REF of the above
2740 dummy parent referencing the corresponding discriminant of the
2741 base type of the parent subtype. */
2742 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2743 build0 (PLACEHOLDER_EXPR, gnu_type),
2744 build_decl (input_location,
2745 FIELD_DECL, NULL_TREE,
2750 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2751 Present (gnat_field);
2752 gnat_field = Next_Stored_Discriminant (gnat_field))
2753 if (Present (Corresponding_Discriminant (gnat_field)))
2756 = gnat_to_gnu_field_decl (Corresponding_Discriminant
2760 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2761 gnu_get_parent, gnu_field, NULL_TREE),
2765 /* Then we build the parent subtype. If it has discriminants but
2766 the type itself has unknown discriminants, this means that it
2767 doesn't contain information about how the discriminants are
2768 derived from those of the ancestor type, so it cannot be used
2769 directly. Instead it is built by cloning the parent subtype
2770 of the underlying record view of the type, for which the above
2771 derivation of discriminants has been made explicit. */
2772 if (Has_Discriminants (gnat_parent)
2773 && Has_Unknown_Discriminants (gnat_entity))
2775 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2777 /* If we are defining the type, the underlying record
2778 view must already have been elaborated at this point.
2779 Otherwise do it now as its parent subtype cannot be
2780 technically elaborated on its own. */
2782 gcc_assert (present_gnu_tree (gnat_uview));
2784 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2786 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2788 /* Substitute the "get to the parent" of the type for that
2789 of its underlying record view in the cloned type. */
2790 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2791 Present (gnat_field);
2792 gnat_field = Next_Stored_Discriminant (gnat_field))
2793 if (Present (Corresponding_Discriminant (gnat_field)))
2795 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2797 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2798 gnu_get_parent, gnu_field, NULL_TREE);
2800 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2804 gnu_parent = gnat_to_gnu_type (gnat_parent);
2806 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2807 initially built. The discriminants must reference the fields
2808 of the parent subtype and not those of its base type for the
2809 placeholder machinery to properly work. */
2812 /* The actual parent subtype is the full view. */
2813 if (IN (Ekind (gnat_parent), Private_Kind))
2815 if (Present (Full_View (gnat_parent)))
2816 gnat_parent = Full_View (gnat_parent);
2818 gnat_parent = Underlying_Full_View (gnat_parent);
2821 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2822 Present (gnat_field);
2823 gnat_field = Next_Stored_Discriminant (gnat_field))
2824 if (Present (Corresponding_Discriminant (gnat_field)))
2826 Entity_Id field = Empty;
2827 for (field = First_Stored_Discriminant (gnat_parent);
2829 field = Next_Stored_Discriminant (field))
2830 if (same_discriminant_p (gnat_field, field))
2832 gcc_assert (Present (field));
2833 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2834 = gnat_to_gnu_field_decl (field);
2838 /* The "get to the parent" COMPONENT_REF must be given its
2840 TREE_TYPE (gnu_get_parent) = gnu_parent;
2842 /* ...and reference the _Parent field of this record. */
2844 = create_field_decl (get_identifier
2845 (Get_Name_String (Name_uParent)),
2846 gnu_parent, gnu_type, 0,
2848 ? TYPE_SIZE (gnu_parent) : NULL_TREE,
2850 ? bitsize_zero_node : NULL_TREE, 1);
2851 DECL_INTERNAL_P (gnu_field) = 1;
2852 TREE_OPERAND (gnu_get_parent, 1) = gnu_field;
2853 TYPE_FIELDS (gnu_type) = gnu_field;
2856 /* Make the fields for the discriminants and put them into the record
2857 unless it's an Unchecked_Union. */
2859 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2860 Present (gnat_field);
2861 gnat_field = Next_Stored_Discriminant (gnat_field))
2863 /* If this is a record extension and this discriminant is the
2864 renaming of another discriminant, we've handled it above. */
2865 if (Present (Parent_Subtype (gnat_entity))
2866 && Present (Corresponding_Discriminant (gnat_field)))
2870 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition,
2873 /* Make an expression using a PLACEHOLDER_EXPR from the
2874 FIELD_DECL node just created and link that with the
2875 corresponding GNAT defining identifier. */
2876 save_gnu_tree (gnat_field,
2877 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2878 build0 (PLACEHOLDER_EXPR, gnu_type),
2879 gnu_field, NULL_TREE),
2882 if (!is_unchecked_union)
2884 TREE_CHAIN (gnu_field) = gnu_field_list;
2885 gnu_field_list = gnu_field;
2889 /* Add the fields into the record type and finish it up. */
2890 components_to_record (gnu_type, Component_List (record_definition),
2891 gnu_field_list, packed, definition, NULL,
2892 false, all_rep, is_unchecked_union,
2893 debug_info_p, false);
2895 /* If it is a tagged record force the type to BLKmode to insure that
2896 these objects will always be put in memory. Likewise for limited
2898 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2899 SET_TYPE_MODE (gnu_type, BLKmode);
2901 /* We used to remove the associations of the discriminants and _Parent
2902 for validity checking but we may need them if there's a Freeze_Node
2903 for a subtype used in this record. */
2904 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2906 /* Fill in locations of fields. */
2907 annotate_rep (gnat_entity, gnu_type);
2909 /* If there are any entities in the chain corresponding to components
2910 that we did not elaborate, ensure we elaborate their types if they
2912 for (gnat_temp = First_Entity (gnat_entity);
2913 Present (gnat_temp);
2914 gnat_temp = Next_Entity (gnat_temp))
2915 if ((Ekind (gnat_temp) == E_Component
2916 || Ekind (gnat_temp) == E_Discriminant)
2917 && Is_Itype (Etype (gnat_temp))
2918 && !present_gnu_tree (gnat_temp))
2919 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2923 case E_Class_Wide_Subtype:
2924 /* If an equivalent type is present, that is what we should use.
2925 Otherwise, fall through to handle this like a record subtype
2926 since it may have constraints. */
2927 if (gnat_equiv_type != gnat_entity)
2929 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
2930 maybe_present = true;
2934 /* ... fall through ... */
2936 case E_Record_Subtype:
2937 /* If Cloned_Subtype is Present it means this record subtype has
2938 identical layout to that type or subtype and we should use
2939 that GCC type for this one. The front end guarantees that
2940 the component list is shared. */
2941 if (Present (Cloned_Subtype (gnat_entity)))
2943 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2945 maybe_present = true;
2949 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2950 changing the type, make a new type with each field having the type of
2951 the field in the new subtype but the position computed by transforming
2952 every discriminant reference according to the constraints. We don't
2953 see any difference between private and non-private type here since
2954 derivations from types should have been deferred until the completion
2955 of the private type. */
2958 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2963 defer_incomplete_level++;
2964 this_deferred = true;
2967 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
2969 if (present_gnu_tree (gnat_entity))
2971 maybe_present = true;
2975 /* When the subtype has discriminants and these discriminants affect
2976 the initial shape it has inherited, factor them in. But for an
2977 Unchecked_Union (it must be an Itype), just return the type.
2978 We can't just test Is_Constrained because private subtypes without
2979 discriminants of types with discriminants with default expressions
2980 are Is_Constrained but aren't constrained! */
2981 if (IN (Ekind (gnat_base_type), Record_Kind)
2982 && !Is_Unchecked_Union (gnat_base_type)
2983 && !Is_For_Access_Subtype (gnat_entity)
2984 && Is_Constrained (gnat_entity)
2985 && Has_Discriminants (gnat_entity)
2986 && Present (Discriminant_Constraint (gnat_entity))
2987 && Stored_Constraint (gnat_entity) != No_Elist)
2990 = build_subst_list (gnat_entity, gnat_base_type, definition);
2991 tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part, t;
2992 tree gnu_variant_list, gnu_pos_list, gnu_field_list = NULL_TREE;
2993 bool selected_variant = false;
2994 Entity_Id gnat_field;
2996 gnu_type = make_node (RECORD_TYPE);
2997 TYPE_NAME (gnu_type) = gnu_entity_name;
2999 /* Set the size, alignment and alias set of the new type to
3000 match that of the old one, doing required substitutions. */
3001 copy_and_substitute_in_size (gnu_type, gnu_base_type,
3004 if (TYPE_IS_PADDING_P (gnu_base_type))
3005 gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3007 gnu_unpad_base_type = gnu_base_type;
3009 /* Look for a REP part in the base type. */
3010 gnu_rep_part = get_rep_part (gnu_unpad_base_type);
3012 /* Look for a variant part in the base type. */
3013 gnu_variant_part = get_variant_part (gnu_unpad_base_type);
3015 /* If there is a variant part, we must compute whether the
3016 constraints statically select a particular variant. If
3017 so, we simply drop the qualified union and flatten the
3018 list of fields. Otherwise we'll build a new qualified
3019 union for the variants that are still relevant. */
3020 if (gnu_variant_part)
3023 = build_variant_list (TREE_TYPE (gnu_variant_part),
3024 gnu_subst_list, NULL_TREE);
3026 /* If all the qualifiers are unconditionally true, the
3027 innermost variant is statically selected. */
3028 selected_variant = true;
3029 for (t = gnu_variant_list; t; t = TREE_CHAIN (t))
3030 if (!integer_onep (TREE_VEC_ELT (TREE_VALUE (t), 1)))
3032 selected_variant = false;
3036 /* Otherwise, create the new variants. */
3037 if (!selected_variant)
3038 for (t = gnu_variant_list; t; t = TREE_CHAIN (t))
3040 tree old_variant = TREE_PURPOSE (t);
3041 tree new_variant = make_node (RECORD_TYPE);
3042 TYPE_NAME (new_variant)
3043 = DECL_NAME (TYPE_NAME (old_variant));
3044 copy_and_substitute_in_size (new_variant, old_variant,
3046 TREE_VEC_ELT (TREE_VALUE (t), 2) = new_variant;
3051 gnu_variant_list = NULL_TREE;
3052 selected_variant = false;
3056 = build_position_list (gnu_unpad_base_type,
3057 gnu_variant_list && !selected_variant,
3058 size_zero_node, bitsize_zero_node,
3059 BIGGEST_ALIGNMENT, NULL_TREE);
3061 for (gnat_field = First_Entity (gnat_entity);
3062 Present (gnat_field);
3063 gnat_field = Next_Entity (gnat_field))
3064 if ((Ekind (gnat_field) == E_Component
3065 || Ekind (gnat_field) == E_Discriminant)
3066 && !(Present (Corresponding_Discriminant (gnat_field))
3067 && Is_Tagged_Type (gnat_base_type))
3068 && Underlying_Type (Scope (Original_Record_Component
3072 Name_Id gnat_name = Chars (gnat_field);
3073 Entity_Id gnat_old_field
3074 = Original_Record_Component (gnat_field);
3076 = gnat_to_gnu_field_decl (gnat_old_field);
3077 tree gnu_context = DECL_CONTEXT (gnu_old_field);
3078 tree gnu_field, gnu_field_type, gnu_size;
3079 tree gnu_cont_type, gnu_last = NULL_TREE;
3081 /* If the type is the same, retrieve the GCC type from the
3082 old field to take into account possible adjustments. */
3083 if (Etype (gnat_field) == Etype (gnat_old_field))
3084 gnu_field_type = TREE_TYPE (gnu_old_field);
3086 gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
3088 /* If there was a component clause, the field types must be
3089 the same for the type and subtype, so copy the data from
3090 the old field to avoid recomputation here. Also if the
3091 field is justified modular and the optimization in
3092 gnat_to_gnu_field was applied. */
3093 if (Present (Component_Clause (gnat_old_field))
3094 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3095 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3096 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3097 == TREE_TYPE (gnu_old_field)))
3099 gnu_size = DECL_SIZE (gnu_old_field);
3100 gnu_field_type = TREE_TYPE (gnu_old_field);
3103 /* If the old field was packed and of constant size, we
3104 have to get the old size here, as it might differ from
3105 what the Etype conveys and the latter might overlap
3106 onto the following field. Try to arrange the type for
3107 possible better packing along the way. */
3108 else if (DECL_PACKED (gnu_old_field)
3109 && TREE_CODE (DECL_SIZE (gnu_old_field))
3112 gnu_size = DECL_SIZE (gnu_old_field);
3113 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3114 && !TYPE_FAT_POINTER_P (gnu_field_type)
3115 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3117 = make_packable_type (gnu_field_type, true);
3121 gnu_size = TYPE_SIZE (gnu_field_type);
3123 /* If the context of the old field is the base type or its
3124 REP part (if any), put the field directly in the new
3125 type; otherwise look up the context in the variant list
3126 and put the field either in the new type if there is a
3127 selected variant or in one of the new variants. */
3128 if (gnu_context == gnu_unpad_base_type
3130 && gnu_context == TREE_TYPE (gnu_rep_part)))
3131 gnu_cont_type = gnu_type;
3134 t = purpose_member (gnu_context, gnu_variant_list);
3137 if (selected_variant)
3138 gnu_cont_type = gnu_type;
3140 gnu_cont_type = TREE_VEC_ELT (TREE_VALUE (t), 2);
3143 /* The front-end may pass us "ghost" components if
3144 it fails to recognize that a constrained subtype
3145 is statically constrained. Discard them. */
3149 /* Now create the new field modeled on the old one. */
3151 = create_field_decl_from (gnu_old_field, gnu_field_type,
3152 gnu_cont_type, gnu_size,
3153 gnu_pos_list, gnu_subst_list);
3155 /* Put it in one of the new variants directly. */
3156 if (gnu_cont_type != gnu_type)
3158 TREE_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type);
3159 TYPE_FIELDS (gnu_cont_type) = gnu_field;
3162 /* To match the layout crafted in components_to_record,
3163 if this is the _Tag or _Parent field, put it before
3164 any other fields. */
3165 else if (gnat_name == Name_uTag
3166 || gnat_name == Name_uParent)
3167 gnu_field_list = chainon (gnu_field_list, gnu_field);
3169 /* Similarly, if this is the _Controller field, put
3170 it before the other fields except for the _Tag or
3172 else if (gnat_name == Name_uController && gnu_last)
3174 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
3175 TREE_CHAIN (gnu_last) = gnu_field;
3178 /* Otherwise, if this is a regular field, put it after
3179 the other fields. */
3182 TREE_CHAIN (gnu_field) = gnu_field_list;
3183 gnu_field_list = gnu_field;
3185 gnu_last = gnu_field;
3188 save_gnu_tree (gnat_field, gnu_field, false);
3191 /* If there is a variant list and no selected variant, we need
3192 to create the nest of variant parts from the old nest. */
3193 if (gnu_variant_list && !selected_variant)
3195 tree new_variant_part
3196 = create_variant_part_from (gnu_variant_part,
3197 gnu_variant_list, gnu_type,
3198 gnu_pos_list, gnu_subst_list);
3199 TREE_CHAIN (new_variant_part) = gnu_field_list;
3200 gnu_field_list = new_variant_part;
3203 /* Now go through the entities again looking for Itypes that
3204 we have not elaborated but should (e.g., Etypes of fields
3205 that have Original_Components). */
3206 for (gnat_field = First_Entity (gnat_entity);
3207 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3208 if ((Ekind (gnat_field) == E_Discriminant
3209 || Ekind (gnat_field) == E_Component)
3210 && !present_gnu_tree (Etype (gnat_field)))
3211 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3213 /* Do not emit debug info for the type yet since we're going to
3215 gnu_field_list = nreverse (gnu_field_list);
3216 finish_record_type (gnu_type, gnu_field_list, 2, false);
3218 /* See the E_Record_Type case for the rationale. */
3219 if (Is_Tagged_Type (gnat_entity)
3220 || Is_Limited_Record (gnat_entity))
3221 SET_TYPE_MODE (gnu_type, BLKmode);
3223 compute_record_mode (gnu_type);
3225 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3227 /* Fill in locations of fields. */
3228 annotate_rep (gnat_entity, gnu_type);
3230 /* If debugging information is being written for the type, write
3231 a record that shows what we are a subtype of and also make a
3232 variable that indicates our size, if still variable. */
3235 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3236 tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type);
3237 tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type);
3239 if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL)
3240 gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name);
3242 TYPE_NAME (gnu_subtype_marker)
3243 = create_concat_name (gnat_entity, "XVS");
3244 finish_record_type (gnu_subtype_marker,
3245 create_field_decl (gnu_unpad_base_name,
3246 build_reference_type
3247 (gnu_unpad_base_type),
3253 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3254 gnu_subtype_marker);
3257 && TREE_CODE (gnu_size_unit) != INTEGER_CST
3258 && !CONTAINS_PLACEHOLDER_P (gnu_size_unit))
3259 create_var_decl (create_concat_name (gnat_entity, "XVZ"),
3260 NULL_TREE, sizetype, gnu_size_unit, false,
3261 false, false, false, NULL, gnat_entity);
3264 /* Now we can finalize it. */
3265 rest_of_record_type_compilation (gnu_type);
3268 /* Otherwise, go down all the components in the new type and make
3269 them equivalent to those in the base type. */
3272 gnu_type = gnu_base_type;
3274 for (gnat_temp = First_Entity (gnat_entity);
3275 Present (gnat_temp);
3276 gnat_temp = Next_Entity (gnat_temp))
3277 if ((Ekind (gnat_temp) == E_Discriminant
3278 && !Is_Unchecked_Union (gnat_base_type))
3279 || Ekind (gnat_temp) == E_Component)
3280 save_gnu_tree (gnat_temp,
3281 gnat_to_gnu_field_decl
3282 (Original_Record_Component (gnat_temp)),
3288 case E_Access_Subprogram_Type:
3289 /* Use the special descriptor type for dispatch tables if needed,
3290 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3291 Note that we are only required to do so for static tables in
3292 order to be compatible with the C++ ABI, but Ada 2005 allows
3293 to extend library level tagged types at the local level so
3294 we do it in the non-static case as well. */
3295 if (TARGET_VTABLE_USES_DESCRIPTORS
3296 && Is_Dispatch_Table_Entity (gnat_entity))
3298 gnu_type = fdesc_type_node;
3299 gnu_size = TYPE_SIZE (gnu_type);
3303 /* ... fall through ... */
3305 case E_Anonymous_Access_Subprogram_Type:
3306 /* If we are not defining this entity, and we have incomplete
3307 entities being processed above us, make a dummy type and
3308 fill it in later. */
3309 if (!definition && defer_incomplete_level != 0)
3311 struct incomplete *p
3312 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3315 = build_pointer_type
3316 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3317 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3318 !Comes_From_Source (gnat_entity),
3319 debug_info_p, gnat_entity);
3320 this_made_decl = true;
3321 gnu_type = TREE_TYPE (gnu_decl);
3322 save_gnu_tree (gnat_entity, gnu_decl, false);
3325 p->old_type = TREE_TYPE (gnu_type);
3326 p->full_type = Directly_Designated_Type (gnat_entity);
3327 p->next = defer_incomplete_list;
3328 defer_incomplete_list = p;
3332 /* ... fall through ... */
3334 case E_Allocator_Type:
3336 case E_Access_Attribute_Type:
3337 case E_Anonymous_Access_Type:
3338 case E_General_Access_Type:
3340 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3341 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3342 bool is_from_limited_with
3343 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3344 && From_With_Type (gnat_desig_equiv));
3346 /* Get the "full view" of this entity. If this is an incomplete
3347 entity from a limited with, treat its non-limited view as the full
3348 view. Otherwise, if this is an incomplete or private type, use the
3349 full view. In the former case, we might point to a private type,
3350 in which case, we need its full view. Also, we want to look at the
3351 actual type used for the representation, so this takes a total of
3353 Entity_Id gnat_desig_full_direct_first
3354 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3355 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3356 ? Full_View (gnat_desig_equiv) : Empty));
3357 Entity_Id gnat_desig_full_direct
3358 = ((is_from_limited_with
3359 && Present (gnat_desig_full_direct_first)
3360 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3361 ? Full_View (gnat_desig_full_direct_first)
3362 : gnat_desig_full_direct_first);
3363 Entity_Id gnat_desig_full
3364 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3366 /* This the type actually used to represent the designated type,
3367 either gnat_desig_full or gnat_desig_equiv. */
3368 Entity_Id gnat_desig_rep;
3370 /* True if this is a pointer to an unconstrained array. */
3371 bool is_unconstrained_array;
3373 /* We want to know if we'll be seeing the freeze node for any
3374 incomplete type we may be pointing to. */
3376 = (Present (gnat_desig_full)
3377 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3378 : In_Extended_Main_Code_Unit (gnat_desig_type));
3380 /* True if we make a dummy type here. */
3381 bool got_fat_p = false;
3382 /* True if the dummy is a fat pointer. */
3383 bool made_dummy = false;
3384 tree gnu_desig_type = NULL_TREE;
3385 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3387 if (!targetm.valid_pointer_mode (p_mode))
3390 /* If either the designated type or its full view is an unconstrained
3391 array subtype, replace it with the type it's a subtype of. This
3392 avoids problems with multiple copies of unconstrained array types.
3393 Likewise, if the designated type is a subtype of an incomplete
3394 record type, use the parent type to avoid order of elaboration
3395 issues. This can lose some code efficiency, but there is no
3397 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3398 && ! Is_Constrained (gnat_desig_equiv))
3399 gnat_desig_equiv = Etype (gnat_desig_equiv);
3400 if (Present (gnat_desig_full)
3401 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3402 && ! Is_Constrained (gnat_desig_full))
3403 || (Ekind (gnat_desig_full) == E_Record_Subtype
3404 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3405 gnat_desig_full = Etype (gnat_desig_full);
3407 /* Now set the type that actually marks the representation of
3408 the designated type and also flag whether we have a unconstrained
3410 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3411 is_unconstrained_array
3412 = (Is_Array_Type (gnat_desig_rep)
3413 && ! Is_Constrained (gnat_desig_rep));
3415 /* If we are pointing to an incomplete type whose completion is an
3416 unconstrained array, make a fat pointer type. The two types in our
3417 fields will be pointers to dummy nodes and will be replaced in
3418 update_pointer_to. Similarly, if the type itself is a dummy type or
3419 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3420 in case we have any thin pointers to it. */
3421 if (is_unconstrained_array
3422 && (Present (gnat_desig_full)
3423 || (present_gnu_tree (gnat_desig_equiv)
3424 && TYPE_IS_DUMMY_P (TREE_TYPE
3425 (get_gnu_tree (gnat_desig_equiv))))
3426 || (No (gnat_desig_full) && ! in_main_unit
3427 && defer_incomplete_level != 0
3428 && ! present_gnu_tree (gnat_desig_equiv))
3429 || (in_main_unit && is_from_limited_with
3430 && Present (Freeze_Node (gnat_desig_rep)))))
3434 if (present_gnu_tree (gnat_desig_rep))
3435 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3438 gnu_old = make_dummy_type (gnat_desig_rep);
3440 /* Show the dummy we get will be a fat pointer. */
3441 got_fat_p = made_dummy = true;
3444 /* If the call above got something that has a pointer, that
3445 pointer is our type. This could have happened either
3446 because the type was elaborated or because somebody
3447 else executed the code below. */
3448 gnu_type = TYPE_POINTER_TO (gnu_old);
3451 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3452 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3453 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3454 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3457 TYPE_NAME (gnu_template_type)
3458 = create_concat_name (gnat_desig_equiv, "XUB");
3459 TYPE_DUMMY_P (gnu_template_type) = 1;
3461 TYPE_NAME (gnu_array_type)
3462 = create_concat_name (gnat_desig_equiv, "XUA");
3463 TYPE_DUMMY_P (gnu_array_type) = 1;
3465 gnu_type = make_node (RECORD_TYPE);
3466 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3467 TYPE_POINTER_TO (gnu_old) = gnu_type;
3469 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3471 = chainon (chainon (NULL_TREE,
3473 (get_identifier ("P_ARRAY"),
3475 gnu_type, 0, 0, 0, 0)),
3476 create_field_decl (get_identifier ("P_BOUNDS"),
3478 gnu_type, 0, 0, 0, 0));
3480 /* Make sure we can place this into a register. */
3481 TYPE_ALIGN (gnu_type)
3482 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3483 TYPE_FAT_POINTER_P (gnu_type) = 1;
3485 /* Do not emit debug info for this record type since the types
3486 of its fields are incomplete. */
3487 finish_record_type (gnu_type, fields, 0, false);
3489 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3490 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3491 = create_concat_name (gnat_desig_equiv, "XUT");
3492 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3496 /* If we already know what the full type is, use it. */
3497 else if (Present (gnat_desig_full)
3498 && present_gnu_tree (gnat_desig_full))
3499 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3501 /* Get the type of the thing we are to point to and build a pointer
3502 to it. If it is a reference to an incomplete or private type with a
3503 full view that is a record, make a dummy type node and get the
3504 actual type later when we have verified it is safe. */
3505 else if ((! in_main_unit
3506 && ! present_gnu_tree (gnat_desig_equiv)
3507 && Present (gnat_desig_full)
3508 && ! present_gnu_tree (gnat_desig_full)
3509 && Is_Record_Type (gnat_desig_full))
3510 /* Likewise if we are pointing to a record or array and we
3511 are to defer elaborating incomplete types. We do this
3512 since this access type may be the full view of some
3513 private type. Note that the unconstrained array case is
3515 || ((! in_main_unit || imported_p)
3516 && defer_incomplete_level != 0
3517 && ! present_gnu_tree (gnat_desig_equiv)
3518 && ((Is_Record_Type (gnat_desig_rep)
3519 || Is_Array_Type (gnat_desig_rep))))
3520 /* If this is a reference from a limited_with type back to our
3521 main unit and there's a Freeze_Node for it, either we have
3522 already processed the declaration and made the dummy type,
3523 in which case we just reuse the latter, or we have not yet,
3524 in which case we make the dummy type and it will be reused
3525 when the declaration is processed. In both cases, the
3526 pointer eventually created below will be automatically
3527 adjusted when the Freeze_Node is processed. Note that the
3528 unconstrained array case is handled above. */
3529 || (in_main_unit && is_from_limited_with
3530 && Present (Freeze_Node (gnat_desig_rep))))
3532 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3536 /* Otherwise handle the case of a pointer to itself. */
3537 else if (gnat_desig_equiv == gnat_entity)
3540 = build_pointer_type_for_mode (void_type_node, p_mode,
3541 No_Strict_Aliasing (gnat_entity));
3542 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3545 /* If expansion is disabled, the equivalent type of a concurrent
3546 type is absent, so build a dummy pointer type. */
3547 else if (type_annotate_only && No (gnat_desig_equiv))
3548 gnu_type = ptr_void_type_node;
3550 /* Finally, handle the straightforward case where we can just
3551 elaborate our designated type and point to it. */
3553 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3555 /* It is possible that a call to gnat_to_gnu_type above resolved our
3556 type. If so, just return it. */
3557 if (present_gnu_tree (gnat_entity))
3559 maybe_present = true;
3563 /* If we have a GCC type for the designated type, possibly modify it
3564 if we are pointing only to constant objects and then make a pointer
3565 to it. Don't do this for unconstrained arrays. */
3566 if (!gnu_type && gnu_desig_type)
3568 if (Is_Access_Constant (gnat_entity)
3569 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3572 = build_qualified_type
3574 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3576 /* Some extra processing is required if we are building a
3577 pointer to an incomplete type (in the GCC sense). We might
3578 have such a type if we just made a dummy, or directly out
3579 of the call to gnat_to_gnu_type above if we are processing
3580 an access type for a record component designating the
3581 record type itself. */
3582 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3584 /* We must ensure that the pointer to variant we make will
3585 be processed by update_pointer_to when the initial type
3586 is completed. Pretend we made a dummy and let further
3587 processing act as usual. */
3590 /* We must ensure that update_pointer_to will not retrieve
3591 the dummy variant when building a properly qualified
3592 version of the complete type. We take advantage of the
3593 fact that get_qualified_type is requiring TYPE_NAMEs to
3594 match to influence build_qualified_type and then also
3595 update_pointer_to here. */
3596 TYPE_NAME (gnu_desig_type)
3597 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3602 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3603 No_Strict_Aliasing (gnat_entity));
3606 /* If we are not defining this object and we made a dummy pointer,
3607 save our current definition, evaluate the actual type, and replace
3608 the tentative type we made with the actual one. If we are to defer
3609 actually looking up the actual type, make an entry in the
3610 deferred list. If this is from a limited with, we have to defer
3611 to the end of the current spec in two cases: first if the
3612 designated type is in the current unit and second if the access
3614 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3617 = TYPE_IS_FAT_POINTER_P (gnu_type)
3618 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3620 if (esize == POINTER_SIZE
3621 && (got_fat_p || TYPE_IS_FAT_POINTER_P (gnu_type)))
3623 = build_pointer_type
3624 (TYPE_OBJECT_RECORD_TYPE
3625 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3627 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3628 !Comes_From_Source (gnat_entity),
3629 debug_info_p, gnat_entity);
3630 this_made_decl = true;
3631 gnu_type = TREE_TYPE (gnu_decl);
3632 save_gnu_tree (gnat_entity, gnu_decl, false);
3635 if (defer_incomplete_level == 0
3636 && ! (is_from_limited_with
3638 || In_Extended_Main_Code_Unit (gnat_entity))))
3639 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3640 gnat_to_gnu_type (gnat_desig_equiv));
3642 /* Note that the call to gnat_to_gnu_type here might have
3643 updated gnu_old_type directly, in which case it is not a
3644 dummy type any more when we get into update_pointer_to.
3646 This may happen for instance when the designated type is a
3647 record type, because their elaboration starts with an
3648 initial node from make_dummy_type, which may yield the same
3649 node as the one we got.
3651 Besides, variants of this non-dummy type might have been
3652 created along the way. update_pointer_to is expected to
3653 properly take care of those situations. */
3656 struct incomplete *p
3657 = (struct incomplete *) xmalloc (sizeof
3658 (struct incomplete));
3659 struct incomplete **head
3660 = (is_from_limited_with
3662 || In_Extended_Main_Code_Unit (gnat_entity))
3663 ? &defer_limited_with : &defer_incomplete_list);
3665 p->old_type = gnu_old_type;
3666 p->full_type = gnat_desig_equiv;
3674 case E_Access_Protected_Subprogram_Type:
3675 case E_Anonymous_Access_Protected_Subprogram_Type:
3676 if (type_annotate_only && No (gnat_equiv_type))
3677 gnu_type = ptr_void_type_node;
3680 /* The runtime representation is the equivalent type. */
3681 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3682 maybe_present = true;
3685 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3686 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3687 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3688 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3689 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3694 case E_Access_Subtype:
3696 /* We treat this as identical to its base type; any constraint is
3697 meaningful only to the front end.
3699 The designated type must be elaborated as well, if it does
3700 not have its own freeze node. Designated (sub)types created
3701 for constrained components of records with discriminants are
3702 not frozen by the front end and thus not elaborated by gigi,
3703 because their use may appear before the base type is frozen,
3704 and because it is not clear that they are needed anywhere in
3705 Gigi. With the current model, there is no correct place where
3706 they could be elaborated. */
3708 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3709 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3710 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3711 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3712 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3714 /* If we are not defining this entity, and we have incomplete
3715 entities being processed above us, make a dummy type and
3716 elaborate it later. */
3717 if (!definition && defer_incomplete_level != 0)
3719 struct incomplete *p
3720 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3722 = build_pointer_type
3723 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3725 p->old_type = TREE_TYPE (gnu_ptr_type);
3726 p->full_type = Directly_Designated_Type (gnat_entity);
3727 p->next = defer_incomplete_list;
3728 defer_incomplete_list = p;
3730 else if (!IN (Ekind (Base_Type
3731 (Directly_Designated_Type (gnat_entity))),
3732 Incomplete_Or_Private_Kind))
3733 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3737 maybe_present = true;
3740 /* Subprogram Entities
3742 The following access functions are defined for subprograms (functions
3745 First_Formal The first formal parameter.
3746 Is_Imported Indicates that the subprogram has appeared in
3747 an INTERFACE or IMPORT pragma. For now we
3748 assume that the external language is C.
3749 Is_Exported Likewise but for an EXPORT pragma.
3750 Is_Inlined True if the subprogram is to be inlined.
3752 In addition for function subprograms we have:
3754 Etype Return type of the function.
3756 Each parameter is first checked by calling must_pass_by_ref on its
3757 type to determine if it is passed by reference. For parameters which
3758 are copied in, if they are Ada In Out or Out parameters, their return
3759 value becomes part of a record which becomes the return type of the
3760 function (C function - note that this applies only to Ada procedures
3761 so there is no Ada return type). Additional code to store back the
3762 parameters will be generated on the caller side. This transformation
3763 is done here, not in the front-end.
3765 The intended result of the transformation can be seen from the
3766 equivalent source rewritings that follow:
3768 struct temp {int a,b};
3769 procedure P (A,B: In Out ...) is temp P (int A,B)
3772 end P; return {A,B};
3779 For subprogram types we need to perform mainly the same conversions to
3780 GCC form that are needed for procedures and function declarations. The
3781 only difference is that at the end, we make a type declaration instead
3782 of a function declaration. */
3784 case E_Subprogram_Type:
3788 /* The first GCC parameter declaration (a PARM_DECL node). The
3789 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3790 actually is the head of this parameter list. */
3791 tree gnu_param_list = NULL_TREE;
3792 /* Likewise for the stub associated with an exported procedure. */
3793 tree gnu_stub_param_list = NULL_TREE;
3794 /* The type returned by a function. If the subprogram is a procedure
3795 this type should be void_type_node. */
3796 tree gnu_return_type = void_type_node;
3797 /* List of fields in return type of procedure with copy-in copy-out
3799 tree gnu_field_list = NULL_TREE;
3800 /* Non-null for subprograms containing parameters passed by copy-in
3801 copy-out (Ada In Out or Out parameters not passed by reference),
3802 in which case it is the list of nodes used to specify the values
3803 of the In Out/Out parameters that are returned as a record upon
3804 procedure return. The TREE_PURPOSE of an element of this list is
3805 a field of the record and the TREE_VALUE is the PARM_DECL
3806 corresponding to that field. This list will be saved in the
3807 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3808 tree gnu_cico_list = NULL_TREE;
3809 /* If an import pragma asks to map this subprogram to a GCC builtin,
3810 this is the builtin DECL node. */
3811 tree gnu_builtin_decl = NULL_TREE;
3812 /* For the stub associated with an exported procedure. */
3813 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3814 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3815 Entity_Id gnat_param;
3816 bool inline_flag = Is_Inlined (gnat_entity);
3817 bool public_flag = Is_Public (gnat_entity) || imported_p;
3819 = (Is_Public (gnat_entity) && !definition) || imported_p;
3821 /* The semantics of "pure" in Ada essentially matches that of "const"
3822 in the back-end. In particular, both properties are orthogonal to
3823 the "nothrow" property if the EH circuitry is explicit in the
3824 internal representation of the back-end. If we are to completely
3825 hide the EH circuitry from it, we need to declare that calls to pure
3826 Ada subprograms that can throw have side effects since they can
3827 trigger an "abnormal" transfer of control flow; thus they can be
3828 neither "const" nor "pure" in the back-end sense. */
3830 = (Exception_Mechanism == Back_End_Exceptions
3831 && Is_Pure (gnat_entity));
3833 bool volatile_flag = No_Return (gnat_entity);
3834 bool return_by_direct_ref_p = false;
3835 bool return_by_invisi_ref_p = false;
3836 bool return_unconstrained_p = false;
3837 bool has_copy_in_out = false;
3838 bool has_stub = false;
3841 /* A parameter may refer to this type, so defer completion of any
3842 incomplete types. */
3843 if (kind == E_Subprogram_Type && !definition)
3845 defer_incomplete_level++;
3846 this_deferred = true;
3849 /* If the subprogram has an alias, it is probably inherited, so
3850 we can use the original one. If the original "subprogram"
3851 is actually an enumeration literal, it may be the first use
3852 of its type, so we must elaborate that type now. */
3853 if (Present (Alias (gnat_entity)))
3855 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3856 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3858 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3861 /* Elaborate any Itypes in the parameters of this entity. */
3862 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3863 Present (gnat_temp);
3864 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3865 if (Is_Itype (Etype (gnat_temp)))
3866 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3871 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3872 corresponding DECL node.
3874 We still want the parameter associations to take place because the
3875 proper generation of calls depends on it (a GNAT parameter without
3876 a corresponding GCC tree has a very specific meaning), so we don't
3878 if (Convention (gnat_entity) == Convention_Intrinsic)
3879 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3881 /* ??? What if we don't find the builtin node above ? warn ? err ?
3882 In the current state we neither warn nor err, and calls will just
3883 be handled as for regular subprograms. */
3885 if (kind == E_Function || kind == E_Subprogram_Type)
3886 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3888 /* If this function returns by reference, make the actual return
3889 type of this function the pointer and mark the decl. */
3890 if (Returns_By_Ref (gnat_entity))
3892 gnu_return_type = build_pointer_type (gnu_return_type);
3893 return_by_direct_ref_p = true;
3896 /* If the Mechanism is By_Reference, ensure this function uses the
3897 target's by-invisible-reference mechanism, which may not be the
3898 same as above (e.g. it might be passing an extra parameter).
3900 Prior to GCC 4, this was handled by just setting TREE_ADDRESSABLE
3901 on the result type. Everything required to pass by invisible
3902 reference using the target's mechanism (e.g. an extra parameter)
3903 was handled at RTL expansion time.
3905 This doesn't work with GCC 4 any more for several reasons. First,
3906 the gimplification process might need to create temporaries of this
3907 type and the gimplifier ICEs on such attempts; that's why the flag
3908 is now set on the function type instead. Second, the middle-end
3909 now also relies on a different attribute, DECL_BY_REFERENCE on the
3910 RESULT_DECL, and expects the by-invisible-reference-ness to be made
3911 explicit in the function body. */
3912 else if (kind == E_Function && Mechanism (gnat_entity) == By_Reference)
3913 return_by_invisi_ref_p = true;
3915 /* If we are supposed to return an unconstrained array, actually return
3916 a fat pointer and make a note of that. */
3917 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3919 gnu_return_type = TREE_TYPE (gnu_return_type);
3920 return_unconstrained_p = true;
3923 /* If the type requires a transient scope, the result is allocated
3924 on the secondary stack, so the result type of the function is
3926 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3928 gnu_return_type = build_pointer_type (gnu_return_type);
3929 return_unconstrained_p = true;
3932 /* If the type is a padded type and the underlying type would not
3933 be passed by reference or this function has a foreign convention,
3934 return the underlying type. */
3935 else if (TYPE_IS_PADDING_P (gnu_return_type)
3936 && (!default_pass_by_ref (TREE_TYPE
3937 (TYPE_FIELDS (gnu_return_type)))
3938 || Has_Foreign_Convention (gnat_entity)))
3939 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3941 /* If the return type is unconstrained, that means it must have a
3942 maximum size. Use the padded type as the effective return type.
3943 And ensure the function uses the target's by-invisible-reference
3944 mechanism to avoid copying too much data when it returns. */
3945 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type)))
3948 = maybe_pad_type (gnu_return_type,
3949 max_size (TYPE_SIZE (gnu_return_type), true),
3950 0, gnat_entity, false, false, false, true);
3951 return_by_invisi_ref_p = true;
3954 /* If the return type has a size that overflows, we cannot have
3955 a function that returns that type. This usage doesn't make
3956 sense anyway, so give an error here. */
3957 if (TYPE_SIZE_UNIT (gnu_return_type)
3958 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
3959 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3961 post_error ("cannot return type whose size overflows",
3963 gnu_return_type = copy_node (gnu_return_type);
3964 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3965 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3966 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3967 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3970 /* Look at all our parameters and get the type of
3971 each. While doing this, build a copy-out structure if
3974 /* Loop over the parameters and get their associated GCC tree.
3975 While doing this, build a copy-out structure if we need one. */
3976 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
3977 Present (gnat_param);
3978 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3980 tree gnu_param_name = get_entity_name (gnat_param);
3981 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3982 tree gnu_param, gnu_field;
3983 bool copy_in_copy_out = false;
3984 Mechanism_Type mech = Mechanism (gnat_param);
3986 /* Builtins are expanded inline and there is no real call sequence
3987 involved. So the type expected by the underlying expander is
3988 always the type of each argument "as is". */
3989 if (gnu_builtin_decl)
3991 /* Handle the first parameter of a valued procedure specially. */
3992 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3993 mech = By_Copy_Return;
3994 /* Otherwise, see if a Mechanism was supplied that forced this
3995 parameter to be passed one way or another. */
3996 else if (mech == Default
3997 || mech == By_Copy || mech == By_Reference)
3999 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4000 mech = By_Descriptor;
4002 else if (By_Short_Descriptor_Last <= mech &&
4003 mech <= By_Short_Descriptor)
4004 mech = By_Short_Descriptor;
4008 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4009 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4010 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4012 mech = By_Reference;
4018 post_error ("unsupported mechanism for&", gnat_param);
4023 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4024 Has_Foreign_Convention (gnat_entity),
4027 /* We are returned either a PARM_DECL or a type if no parameter
4028 needs to be passed; in either case, adjust the type. */
4029 if (DECL_P (gnu_param))
4030 gnu_param_type = TREE_TYPE (gnu_param);
4033 gnu_param_type = gnu_param;
4034 gnu_param = NULL_TREE;
4039 /* If it's an exported subprogram, we build a parameter list
4040 in parallel, in case we need to emit a stub for it. */
4041 if (Is_Exported (gnat_entity))
4044 = chainon (gnu_param, gnu_stub_param_list);
4045 /* Change By_Descriptor parameter to By_Reference for
4046 the internal version of an exported subprogram. */
4047 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4050 = gnat_to_gnu_param (gnat_param, By_Reference,
4056 gnu_param = copy_node (gnu_param);
4059 gnu_param_list = chainon (gnu_param, gnu_param_list);
4060 Sloc_to_locus (Sloc (gnat_param),
4061 &DECL_SOURCE_LOCATION (gnu_param));
4062 save_gnu_tree (gnat_param, gnu_param, false);
4064 /* If a parameter is a pointer, this function may modify
4065 memory through it and thus shouldn't be considered
4066 a const function. Also, the memory may be modified
4067 between two calls, so they can't be CSE'ed. The latter
4068 case also handles by-ref parameters. */
4069 if (POINTER_TYPE_P (gnu_param_type)
4070 || TYPE_IS_FAT_POINTER_P (gnu_param_type))
4074 if (copy_in_copy_out)
4076 if (!has_copy_in_out)
4078 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4079 gnu_return_type = make_node (RECORD_TYPE);
4080 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4081 /* Set a default alignment to speed up accesses. */
4082 TYPE_ALIGN (gnu_return_type)
4083 = get_mode_alignment (ptr_mode);
4084 has_copy_in_out = true;
4087 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4088 gnu_return_type, 0, 0, 0, 0);
4089 Sloc_to_locus (Sloc (gnat_param),
4090 &DECL_SOURCE_LOCATION (gnu_field));
4091 TREE_CHAIN (gnu_field) = gnu_field_list;
4092 gnu_field_list = gnu_field;
4094 = tree_cons (gnu_field, gnu_param, gnu_cico_list);
4098 /* Do not compute record for out parameters if subprogram is
4099 stubbed since structures are incomplete for the back-end. */
4100 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4101 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4104 /* If we have a CICO list but it has only one entry, we convert
4105 this function into a function that simply returns that one
4107 if (list_length (gnu_cico_list) == 1)
4108 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list));
4110 if (Has_Stdcall_Convention (gnat_entity))
4111 prepend_one_attribute_to
4112 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4113 get_identifier ("stdcall"), NULL_TREE,
4116 /* If we are on a target where stack realignment is needed for 'main'
4117 to honor GCC's implicit expectations (stack alignment greater than
4118 what the base ABI guarantees), ensure we do the same for foreign
4119 convention subprograms as they might be used as callbacks from code
4120 breaking such expectations. Note that this applies to task entry
4121 points in particular. */
4122 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4123 && Has_Foreign_Convention (gnat_entity))
4124 prepend_one_attribute_to
4125 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4126 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4129 /* The lists have been built in reverse. */
4130 gnu_param_list = nreverse (gnu_param_list);
4132 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4133 gnu_cico_list = nreverse (gnu_cico_list);
4135 if (Ekind (gnat_entity) == E_Function)
4136 Set_Mechanism (gnat_entity, return_unconstrained_p
4137 || return_by_direct_ref_p
4138 || return_by_invisi_ref_p
4139 ? By_Reference : By_Copy);
4141 = create_subprog_type (gnu_return_type, gnu_param_list,
4142 gnu_cico_list, return_unconstrained_p,
4143 return_by_direct_ref_p,
4144 return_by_invisi_ref_p);
4148 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4149 gnu_cico_list, return_unconstrained_p,
4150 return_by_direct_ref_p,
4151 return_by_invisi_ref_p);
4153 /* A subprogram (something that doesn't return anything) shouldn't
4154 be considered const since there would be no reason for such a
4155 subprogram. Note that procedures with Out (or In Out) parameters
4156 have already been converted into a function with a return type. */
4157 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4161 = build_qualified_type (gnu_type,
4162 TYPE_QUALS (gnu_type)
4163 | (TYPE_QUAL_CONST * const_flag)
4164 | (TYPE_QUAL_VOLATILE * volatile_flag));
4166 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4170 = build_qualified_type (gnu_stub_type,
4171 TYPE_QUALS (gnu_stub_type)
4172 | (TYPE_QUAL_CONST * const_flag)
4173 | (TYPE_QUAL_VOLATILE * volatile_flag));
4175 /* If we have a builtin decl for that function, check the signatures
4176 compatibilities. If the signatures are compatible, use the builtin
4177 decl. If they are not, we expect the checker predicate to have
4178 posted the appropriate errors, and just continue with what we have
4180 if (gnu_builtin_decl)
4182 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4184 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4186 gnu_decl = gnu_builtin_decl;
4187 gnu_type = gnu_builtin_type;
4192 /* If there was no specified Interface_Name and the external and
4193 internal names of the subprogram are the same, only use the
4194 internal name to allow disambiguation of nested subprograms. */
4195 if (No (Interface_Name (gnat_entity))
4196 && gnu_ext_name == gnu_entity_name)
4197 gnu_ext_name = NULL_TREE;
4199 /* If we are defining the subprogram and it has an Address clause
4200 we must get the address expression from the saved GCC tree for the
4201 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4202 the address expression here since the front-end has guaranteed
4203 in that case that the elaboration has no effects. If there is
4204 an Address clause and we are not defining the object, just
4205 make it a constant. */
4206 if (Present (Address_Clause (gnat_entity)))
4208 tree gnu_address = NULL_TREE;
4212 = (present_gnu_tree (gnat_entity)
4213 ? get_gnu_tree (gnat_entity)
4214 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4216 save_gnu_tree (gnat_entity, NULL_TREE, false);
4218 /* Convert the type of the object to a reference type that can
4219 alias everything as per 13.3(19). */
4221 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4223 gnu_address = convert (gnu_type, gnu_address);
4226 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4227 gnu_address, false, Is_Public (gnat_entity),
4228 extern_flag, false, NULL, gnat_entity);
4229 DECL_BY_REF_P (gnu_decl) = 1;
4232 else if (kind == E_Subprogram_Type)
4233 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4234 !Comes_From_Source (gnat_entity),
4235 debug_info_p, gnat_entity);
4240 gnu_stub_name = gnu_ext_name;
4241 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4242 public_flag = false;
4245 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4246 gnu_type, gnu_param_list,
4247 inline_flag, public_flag,
4248 extern_flag, attr_list,
4253 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4254 gnu_stub_type, gnu_stub_param_list,
4256 extern_flag, attr_list,
4258 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4261 /* This is unrelated to the stub built right above. */
4262 DECL_STUBBED_P (gnu_decl)
4263 = Convention (gnat_entity) == Convention_Stubbed;
4268 case E_Incomplete_Type:
4269 case E_Incomplete_Subtype:
4270 case E_Private_Type:
4271 case E_Private_Subtype:
4272 case E_Limited_Private_Type:
4273 case E_Limited_Private_Subtype:
4274 case E_Record_Type_With_Private:
4275 case E_Record_Subtype_With_Private:
4277 /* Get the "full view" of this entity. If this is an incomplete
4278 entity from a limited with, treat its non-limited view as the
4279 full view. Otherwise, use either the full view or the underlying
4280 full view, whichever is present. This is used in all the tests
4283 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4284 && From_With_Type (gnat_entity))
4285 ? Non_Limited_View (gnat_entity)
4286 : Present (Full_View (gnat_entity))
4287 ? Full_View (gnat_entity)
4288 : Underlying_Full_View (gnat_entity);
4290 /* If this is an incomplete type with no full view, it must be a Taft
4291 Amendment type, in which case we return a dummy type. Otherwise,
4292 just get the type from its Etype. */
4295 if (kind == E_Incomplete_Type)
4297 gnu_type = make_dummy_type (gnat_entity);
4298 gnu_decl = TYPE_STUB_DECL (gnu_type);
4302 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4304 maybe_present = true;
4309 /* If we already made a type for the full view, reuse it. */
4310 else if (present_gnu_tree (full_view))
4312 gnu_decl = get_gnu_tree (full_view);
4316 /* Otherwise, if we are not defining the type now, get the type
4317 from the full view. But always get the type from the full view
4318 for define on use types, since otherwise we won't see them! */
4319 else if (!definition
4320 || (Is_Itype (full_view)
4321 && No (Freeze_Node (gnat_entity)))
4322 || (Is_Itype (gnat_entity)
4323 && No (Freeze_Node (full_view))))
4325 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4326 maybe_present = true;
4330 /* For incomplete types, make a dummy type entry which will be
4331 replaced later. Save it as the full declaration's type so
4332 we can do any needed updates when we see it. */
4333 gnu_type = make_dummy_type (gnat_entity);
4334 gnu_decl = TYPE_STUB_DECL (gnu_type);
4335 save_gnu_tree (full_view, gnu_decl, 0);
4339 /* Simple class_wide types are always viewed as their root_type
4340 by Gigi unless an Equivalent_Type is specified. */
4341 case E_Class_Wide_Type:
4342 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4343 maybe_present = true;
4347 case E_Task_Subtype:
4348 case E_Protected_Type:
4349 case E_Protected_Subtype:
4350 if (type_annotate_only && No (gnat_equiv_type))
4351 gnu_type = void_type_node;
4353 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4355 maybe_present = true;
4359 gnu_decl = create_label_decl (gnu_entity_name);
4364 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4365 we've already saved it, so we don't try to. */
4366 gnu_decl = error_mark_node;
4374 /* If we had a case where we evaluated another type and it might have
4375 defined this one, handle it here. */
4376 if (maybe_present && present_gnu_tree (gnat_entity))
4378 gnu_decl = get_gnu_tree (gnat_entity);
4382 /* If we are processing a type and there is either no decl for it or
4383 we just made one, do some common processing for the type, such as
4384 handling alignment and possible padding. */
4385 if (is_type && (!gnu_decl || this_made_decl))
4387 if (Is_Tagged_Type (gnat_entity)
4388 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4389 TYPE_ALIGN_OK (gnu_type) = 1;
4391 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4392 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4394 /* ??? Don't set the size for a String_Literal since it is either
4395 confirming or we don't handle it properly (if the low bound is
4397 if (!gnu_size && kind != E_String_Literal_Subtype)
4398 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4400 Has_Size_Clause (gnat_entity));
4402 /* If a size was specified, see if we can make a new type of that size
4403 by rearranging the type, for example from a fat to a thin pointer. */
4407 = make_type_from_size (gnu_type, gnu_size,
4408 Has_Biased_Representation (gnat_entity));
4410 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4411 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4415 /* If the alignment hasn't already been processed and this is
4416 not an unconstrained array, see if an alignment is specified.
4417 If not, we pick a default alignment for atomic objects. */
4418 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4420 else if (Known_Alignment (gnat_entity))
4422 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4423 TYPE_ALIGN (gnu_type));
4425 /* Warn on suspiciously large alignments. This should catch
4426 errors about the (alignment,byte)/(size,bit) discrepancy. */
4427 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4431 /* If a size was specified, take it into account. Otherwise
4432 use the RM size for records as the type size has already
4433 been adjusted to the alignment. */
4436 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4437 || TREE_CODE (gnu_type) == UNION_TYPE
4438 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4439 && !TYPE_FAT_POINTER_P (gnu_type))
4440 size = rm_size (gnu_type);
4442 size = TYPE_SIZE (gnu_type);
4444 /* Consider an alignment as suspicious if the alignment/size
4445 ratio is greater or equal to the byte/bit ratio. */
4446 if (host_integerp (size, 1)
4447 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4448 post_error_ne ("?suspiciously large alignment specified for&",
4449 Expression (Alignment_Clause (gnat_entity)),
4453 else if (Is_Atomic (gnat_entity) && !gnu_size
4454 && host_integerp (TYPE_SIZE (gnu_type), 1)
4455 && integer_pow2p (TYPE_SIZE (gnu_type)))
4456 align = MIN (BIGGEST_ALIGNMENT,
4457 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4458 else if (Is_Atomic (gnat_entity) && gnu_size
4459 && host_integerp (gnu_size, 1)
4460 && integer_pow2p (gnu_size))
4461 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4463 /* See if we need to pad the type. If we did, and made a record,
4464 the name of the new type may be changed. So get it back for
4465 us when we make the new TYPE_DECL below. */
4466 if (gnu_size || align > 0)
4467 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4468 false, !gnu_decl, definition, false);
4470 if (TYPE_IS_PADDING_P (gnu_type))
4472 gnu_entity_name = TYPE_NAME (gnu_type);
4473 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4474 gnu_entity_name = DECL_NAME (gnu_entity_name);
4477 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4479 /* If we are at global level, GCC will have applied variable_size to
4480 the type, but that won't have done anything. So, if it's not
4481 a constant or self-referential, call elaborate_expression_1 to
4482 make a variable for the size rather than calculating it each time.
4483 Handle both the RM size and the actual size. */
4484 if (global_bindings_p ()
4485 && TYPE_SIZE (gnu_type)
4486 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4487 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4489 if (TREE_CODE (gnu_type) == RECORD_TYPE
4490 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4491 TYPE_SIZE (gnu_type), 0))
4493 TYPE_SIZE (gnu_type)
4494 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4495 gnat_entity, get_identifier ("SIZE"),
4497 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4501 TYPE_SIZE (gnu_type)
4502 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4503 gnat_entity, get_identifier ("SIZE"),
4506 /* ??? For now, store the size as a multiple of the alignment
4507 in bytes so that we can see the alignment from the tree. */
4508 TYPE_SIZE_UNIT (gnu_type)
4510 (MULT_EXPR, sizetype,
4511 elaborate_expression_1
4512 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4513 TYPE_SIZE_UNIT (gnu_type),
4514 size_int (TYPE_ALIGN (gnu_type)
4516 gnat_entity, get_identifier ("SIZE_A_UNIT"),
4518 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4520 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4523 elaborate_expression_1 (TYPE_ADA_SIZE (gnu_type),
4525 get_identifier ("RM_SIZE"),
4526 definition, false));
4530 /* If this is a record type or subtype, call elaborate_expression_1 on
4531 any field position. Do this for both global and local types.
4532 Skip any fields that we haven't made trees for to avoid problems with
4533 class wide types. */
4534 if (IN (kind, Record_Kind))
4535 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4536 gnat_temp = Next_Entity (gnat_temp))
4537 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4539 tree gnu_field = get_gnu_tree (gnat_temp);
4541 /* ??? Unfortunately, GCC needs to be able to prove the
4542 alignment of this offset and if it's a variable, it can't.
4543 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4544 right now, we have to put in an explicit multiply and
4545 divide by that value. */
4546 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4548 DECL_FIELD_OFFSET (gnu_field)
4550 (MULT_EXPR, sizetype,
4551 elaborate_expression_1
4552 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4553 DECL_FIELD_OFFSET (gnu_field),
4554 size_int (DECL_OFFSET_ALIGN (gnu_field)
4556 gnat_temp, get_identifier ("OFFSET"),
4558 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4560 /* ??? The context of gnu_field is not necessarily gnu_type so
4561 the MULT_EXPR node built above may not be marked by the call
4562 to create_type_decl below. */
4563 if (global_bindings_p ())
4564 MARK_VISITED (DECL_FIELD_OFFSET (gnu_field));
4568 if (Treat_As_Volatile (gnat_entity))
4570 = build_qualified_type (gnu_type,
4571 TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
4573 if (Is_Atomic (gnat_entity))
4574 check_ok_for_atomic (gnu_type, gnat_entity, false);
4576 if (Present (Alignment_Clause (gnat_entity)))
4577 TYPE_USER_ALIGN (gnu_type) = 1;
4579 if (Universal_Aliasing (gnat_entity))
4580 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4583 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4584 !Comes_From_Source (gnat_entity),
4585 debug_info_p, gnat_entity);
4588 TREE_TYPE (gnu_decl) = gnu_type;
4589 TYPE_STUB_DECL (gnu_type) = gnu_decl;
4593 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4595 gnu_type = TREE_TYPE (gnu_decl);
4597 /* If this is a derived type, relate its alias set to that of its parent
4598 to avoid troubles when a call to an inherited primitive is inlined in
4599 a context where a derived object is accessed. The inlined code works
4600 on the parent view so the resulting code may access the same object
4601 using both the parent and the derived alias sets, which thus have to
4602 conflict. As the same issue arises with component references, the
4603 parent alias set also has to conflict with composite types enclosing
4604 derived components. For instance, if we have:
4611 we want T to conflict with both D and R, in addition to R being a
4612 superset of D by record/component construction.
4614 One way to achieve this is to perform an alias set copy from the
4615 parent to the derived type. This is not quite appropriate, though,
4616 as we don't want separate derived types to conflict with each other:
4618 type I1 is new Integer;
4619 type I2 is new Integer;
4621 We want I1 and I2 to both conflict with Integer but we do not want
4622 I1 to conflict with I2, and an alias set copy on derivation would
4625 The option chosen is to make the alias set of the derived type a
4626 superset of that of its parent type. It trivially fulfills the
4627 simple requirement for the Integer derivation example above, and
4628 the component case as well by superset transitivity:
4631 R ----------> D ----------> T
4633 However, for composite types, conversions between derived types are
4634 translated into VIEW_CONVERT_EXPRs so a sequence like:
4636 type Comp1 is new Comp;
4637 type Comp2 is new Comp;
4638 procedure Proc (C : Comp1);
4646 Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C));
4648 and gimplified into:
4655 i.e. generates code involving type punning. Therefore, Comp1 needs
4656 to conflict with Comp2 and an alias set copy is required.
4658 The language rules ensure the parent type is already frozen here. */
4659 if (Is_Derived_Type (gnat_entity))
4661 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4662 relate_alias_sets (gnu_type, gnu_parent_type,
4663 Is_Composite_Type (gnat_entity)
4664 ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET);
4667 /* Back-annotate the Alignment of the type if not already in the
4668 tree. Likewise for sizes. */
4669 if (Unknown_Alignment (gnat_entity))
4671 unsigned int double_align, align;
4672 bool is_capped_double, align_clause;
4674 /* If the default alignment of "double" or larger scalar types is
4675 specifically capped and this is not an array with an alignment
4676 clause on the component type, return the cap. */
4677 if ((double_align = double_float_alignment) > 0)
4679 = is_double_float_or_array (gnat_entity, &align_clause);
4680 else if ((double_align = double_scalar_alignment) > 0)
4682 = is_double_scalar_or_array (gnat_entity, &align_clause);
4684 is_capped_double = align_clause = false;
4686 if (is_capped_double && !align_clause)
4687 align = double_align;
4689 align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
4691 Set_Alignment (gnat_entity, UI_From_Int (align));
4694 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4696 /* If the size is self-referential, we annotate the maximum
4697 value of that size. */
4698 tree gnu_size = TYPE_SIZE (gnu_type);
4700 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4701 gnu_size = max_size (gnu_size, true);
4703 Set_Esize (gnat_entity, annotate_value (gnu_size));
4705 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4707 /* In this mode the tag and the parent components are not
4708 generated by the front-end, so the sizes must be adjusted
4710 int size_offset, new_size;
4712 if (Is_Derived_Type (gnat_entity))
4715 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4716 Set_Alignment (gnat_entity,
4717 Alignment (Etype (Base_Type (gnat_entity))));
4720 size_offset = POINTER_SIZE;
4722 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4723 Set_Esize (gnat_entity,
4724 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4725 / POINTER_SIZE) * POINTER_SIZE));
4726 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4730 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4731 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4734 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4735 DECL_ARTIFICIAL (gnu_decl) = 1;
4737 if (!debug_info_p && DECL_P (gnu_decl)
4738 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4739 && No (Renamed_Object (gnat_entity)))
4740 DECL_IGNORED_P (gnu_decl) = 1;
4742 /* If we haven't already, associate the ..._DECL node that we just made with
4743 the input GNAT entity node. */
4745 save_gnu_tree (gnat_entity, gnu_decl, false);
4747 /* If this is an enumeration or floating-point type, we were not able to set
4748 the bounds since they refer to the type. These are always static. */
4749 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4750 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4752 tree gnu_scalar_type = gnu_type;
4753 tree gnu_low_bound, gnu_high_bound;
4755 /* If this is a padded type, we need to use the underlying type. */
4756 if (TYPE_IS_PADDING_P (gnu_scalar_type))
4757 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4759 /* If this is a floating point type and we haven't set a floating
4760 point type yet, use this in the evaluation of the bounds. */
4761 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4762 longest_float_type_node = gnu_scalar_type;
4764 gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4765 gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity));
4767 if (kind == E_Enumeration_Type)
4769 /* Enumeration types have specific RM bounds. */
4770 SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound);
4771 SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound);
4773 /* Write full debugging information. Since this has both a
4774 typedef and a tag, avoid outputting the name twice. */
4775 DECL_ARTIFICIAL (gnu_decl) = 1;
4776 rest_of_type_decl_compilation (gnu_decl);
4781 /* Floating-point types don't have specific RM bounds. */
4782 TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound;
4783 TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound;
4787 /* If we deferred processing of incomplete types, re-enable it. If there
4788 were no other disables and we have some to process, do so. */
4789 if (this_deferred && --defer_incomplete_level == 0)
4791 if (defer_incomplete_list)
4793 struct incomplete *incp, *next;
4795 /* We are back to level 0 for the deferring of incomplete types.
4796 But processing these incomplete types below may itself require
4797 deferring, so preserve what we have and restart from scratch. */
4798 incp = defer_incomplete_list;
4799 defer_incomplete_list = NULL;
4801 /* For finalization, however, all types must be complete so we
4802 cannot do the same because deferred incomplete types may end up
4803 referencing each other. Process them all recursively first. */
4804 defer_finalize_level++;
4806 for (; incp; incp = next)
4811 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4812 gnat_to_gnu_type (incp->full_type));
4816 defer_finalize_level--;
4819 /* All the deferred incomplete types have been processed so we can
4820 now proceed with the finalization of the deferred types. */
4821 if (defer_finalize_level == 0 && defer_finalize_list)
4826 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4827 rest_of_type_decl_compilation_no_defer (t);
4829 VEC_free (tree, heap, defer_finalize_list);
4833 /* If we are not defining this type, see if it's in the incomplete list.
4834 If so, handle that list entry now. */
4835 else if (!definition)
4837 struct incomplete *incp;
4839 for (incp = defer_incomplete_list; incp; incp = incp->next)
4840 if (incp->old_type && incp->full_type == gnat_entity)
4842 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4843 TREE_TYPE (gnu_decl));
4844 incp->old_type = NULL_TREE;
4851 /* If this is a packed array type whose original array type is itself
4852 an Itype without freeze node, make sure the latter is processed. */
4853 if (Is_Packed_Array_Type (gnat_entity)
4854 && Is_Itype (Original_Array_Type (gnat_entity))
4855 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4856 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4857 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4862 /* Similar, but if the returned value is a COMPONENT_REF, return the
4866 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4868 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4870 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4871 gnu_field = TREE_OPERAND (gnu_field, 1);
4876 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4877 the GCC type corresponding to that entity. */
4880 gnat_to_gnu_type (Entity_Id gnat_entity)
4884 /* The back end never attempts to annotate generic types. */
4885 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4886 return void_type_node;
4888 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4889 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4891 return TREE_TYPE (gnu_decl);
4894 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4895 the unpadded version of the GCC type corresponding to that entity. */
4898 get_unpadded_type (Entity_Id gnat_entity)
4900 tree type = gnat_to_gnu_type (gnat_entity);
4902 if (TYPE_IS_PADDING_P (type))
4903 type = TREE_TYPE (TYPE_FIELDS (type));
4908 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4909 Every TYPE_DECL generated for a type definition must be passed
4910 to this function once everything else has been done for it. */
4913 rest_of_type_decl_compilation (tree decl)
4915 /* We need to defer finalizing the type if incomplete types
4916 are being deferred or if they are being processed. */
4917 if (defer_incomplete_level || defer_finalize_level)
4918 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4920 rest_of_type_decl_compilation_no_defer (decl);
4923 /* Same as above but without deferring the compilation. This
4924 function should not be invoked directly on a TYPE_DECL. */
4927 rest_of_type_decl_compilation_no_defer (tree decl)
4929 const int toplev = global_bindings_p ();
4930 tree t = TREE_TYPE (decl);
4932 rest_of_decl_compilation (decl, toplev, 0);
4934 /* Now process all the variants. This is needed for STABS. */
4935 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4937 if (t == TREE_TYPE (decl))
4940 if (!TYPE_STUB_DECL (t))
4941 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4943 rest_of_type_compilation (t, toplev);
4947 /* Finalize any From_With_Type incomplete types. We do this after processing
4948 our compilation unit and after processing its spec, if this is a body. */
4951 finalize_from_with_types (void)
4953 struct incomplete *incp = defer_limited_with;
4954 struct incomplete *next;
4956 defer_limited_with = 0;
4957 for (; incp; incp = next)
4961 if (incp->old_type != 0)
4962 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4963 gnat_to_gnu_type (incp->full_type));
4968 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4969 kind of type (such E_Task_Type) that has a different type which Gigi
4970 uses for its representation. If the type does not have a special type
4971 for its representation, return GNAT_ENTITY. If a type is supposed to
4972 exist, but does not, abort unless annotating types, in which case
4973 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4976 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4978 Entity_Id gnat_equiv = gnat_entity;
4980 if (No (gnat_entity))
4983 switch (Ekind (gnat_entity))
4985 case E_Class_Wide_Subtype:
4986 if (Present (Equivalent_Type (gnat_entity)))
4987 gnat_equiv = Equivalent_Type (gnat_entity);
4990 case E_Access_Protected_Subprogram_Type:
4991 case E_Anonymous_Access_Protected_Subprogram_Type:
4992 gnat_equiv = Equivalent_Type (gnat_entity);
4995 case E_Class_Wide_Type:
4996 gnat_equiv = Root_Type (gnat_entity);
5000 case E_Task_Subtype:
5001 case E_Protected_Type:
5002 case E_Protected_Subtype:
5003 gnat_equiv = Corresponding_Record_Type (gnat_entity);
5010 gcc_assert (Present (gnat_equiv) || type_annotate_only);
5014 /* Return a GCC tree for a type corresponding to the component type of the
5015 array type or subtype GNAT_ARRAY. DEFINITION is true if this component
5016 is for an array being defined. DEBUG_INFO_P is true if we need to write
5017 debug information for other types that we may create in the process. */
5020 gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition,
5023 tree gnu_type = gnat_to_gnu_type (Component_Type (gnat_array));
5026 /* Try to get a smaller form of the component if needed. */
5027 if ((Is_Packed (gnat_array)
5028 || Has_Component_Size_Clause (gnat_array))
5029 && !Is_Bit_Packed_Array (gnat_array)
5030 && !Has_Aliased_Components (gnat_array)
5031 && !Strict_Alignment (Component_Type (gnat_array))
5032 && TREE_CODE (gnu_type) == RECORD_TYPE
5033 && !TYPE_FAT_POINTER_P (gnu_type)
5034 && host_integerp (TYPE_SIZE (gnu_type), 1))
5035 gnu_type = make_packable_type (gnu_type, false);
5037 if (Has_Atomic_Components (gnat_array))
5038 check_ok_for_atomic (gnu_type, gnat_array, true);
5040 /* Get and validate any specified Component_Size. */
5042 = validate_size (Component_Size (gnat_array), gnu_type, gnat_array,
5043 Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL,
5044 true, Has_Component_Size_Clause (gnat_array));
5046 /* If the array has aliased components and the component size can be zero,
5047 force at least unit size to ensure that the components have distinct
5050 && Has_Aliased_Components (gnat_array)
5051 && (integer_zerop (TYPE_SIZE (gnu_type))
5052 || (TREE_CODE (gnu_type) == ARRAY_TYPE
5053 && !TREE_CONSTANT (TYPE_SIZE (gnu_type)))))
5055 = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node);
5057 /* If the component type is a RECORD_TYPE that has a self-referential size,
5058 then use the maximum size for the component size. */
5060 && TREE_CODE (gnu_type) == RECORD_TYPE
5061 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
5062 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
5064 /* Honor the component size. This is not needed for bit-packed arrays. */
5065 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array))
5067 tree orig_type = gnu_type;
5068 unsigned int max_align;
5070 /* If an alignment is specified, use it as a cap on the component type
5071 so that it can be honored for the whole type. But ignore it for the
5072 original type of packed array types. */
5073 if (No (Packed_Array_Type (gnat_array)) && Known_Alignment (gnat_array))
5074 max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0);
5078 gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false);
5079 if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
5080 gnu_type = orig_type;
5082 orig_type = gnu_type;
5084 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array,
5085 true, false, definition, true);
5087 /* If a padding record was made, declare it now since it will never be
5088 declared otherwise. This is necessary to ensure that its subtrees
5089 are properly marked. */
5090 if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type)))
5091 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true,
5092 debug_info_p, gnat_array);
5095 if (Has_Volatile_Components (Base_Type (gnat_array)))
5097 = build_qualified_type (gnu_type,
5098 TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE);
5103 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
5104 using MECH as its passing mechanism, to be placed in the parameter
5105 list built for GNAT_SUBPROG. Assume a foreign convention for the
5106 latter if FOREIGN is true. Also set CICO to true if the parameter
5107 must use the copy-in copy-out implementation mechanism.
5109 The returned tree is a PARM_DECL, except for those cases where no
5110 parameter needs to be actually passed to the subprogram; the type
5111 of this "shadow" parameter is then returned instead. */
5114 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
5115 Entity_Id gnat_subprog, bool foreign, bool *cico)
5117 tree gnu_param_name = get_entity_name (gnat_param);
5118 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
5119 tree gnu_param_type_alt = NULL_TREE;
5120 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
5121 /* The parameter can be indirectly modified if its address is taken. */
5122 bool ro_param = in_param && !Address_Taken (gnat_param);
5123 bool by_return = false, by_component_ptr = false, by_ref = false;
5126 /* Copy-return is used only for the first parameter of a valued procedure.
5127 It's a copy mechanism for which a parameter is never allocated. */
5128 if (mech == By_Copy_Return)
5130 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5135 /* If this is either a foreign function or if the underlying type won't
5136 be passed by reference, strip off possible padding type. */
5137 if (TYPE_IS_PADDING_P (gnu_param_type))
5139 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5141 if (mech == By_Reference
5143 || (!must_pass_by_ref (unpadded_type)
5144 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5145 gnu_param_type = unpadded_type;
5148 /* If this is a read-only parameter, make a variant of the type that is
5149 read-only. ??? However, if this is an unconstrained array, that type
5150 can be very complex, so skip it for now. Likewise for any other
5151 self-referential type. */
5153 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5154 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5155 gnu_param_type = build_qualified_type (gnu_param_type,
5156 (TYPE_QUALS (gnu_param_type)
5157 | TYPE_QUAL_CONST));
5159 /* For foreign conventions, pass arrays as pointers to the element type.
5160 First check for unconstrained array and get the underlying array. */
5161 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5163 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5165 /* VMS descriptors are themselves passed by reference. */
5166 if (mech == By_Short_Descriptor ||
5167 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5169 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5170 Mechanism (gnat_param),
5172 else if (mech == By_Descriptor)
5174 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5175 chosen in fill_vms_descriptor. */
5177 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5178 Mechanism (gnat_param),
5181 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5182 Mechanism (gnat_param),
5186 /* Arrays are passed as pointers to element type for foreign conventions. */
5189 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5191 /* Strip off any multi-dimensional entries, then strip
5192 off the last array to get the component type. */
5193 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5194 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5195 gnu_param_type = TREE_TYPE (gnu_param_type);
5197 by_component_ptr = true;
5198 gnu_param_type = TREE_TYPE (gnu_param_type);
5201 gnu_param_type = build_qualified_type (gnu_param_type,
5202 (TYPE_QUALS (gnu_param_type)
5203 | TYPE_QUAL_CONST));
5205 gnu_param_type = build_pointer_type (gnu_param_type);
5208 /* Fat pointers are passed as thin pointers for foreign conventions. */
5209 else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type))
5211 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5213 /* If we must pass or were requested to pass by reference, do so.
5214 If we were requested to pass by copy, do so.
5215 Otherwise, for foreign conventions, pass In Out or Out parameters
5216 or aggregates by reference. For COBOL and Fortran, pass all
5217 integer and FP types that way too. For Convention Ada, use
5218 the standard Ada default. */
5219 else if (must_pass_by_ref (gnu_param_type)
5220 || mech == By_Reference
5223 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5225 && (Convention (gnat_subprog) == Convention_Fortran
5226 || Convention (gnat_subprog) == Convention_COBOL)
5227 && (INTEGRAL_TYPE_P (gnu_param_type)
5228 || FLOAT_TYPE_P (gnu_param_type)))
5230 && default_pass_by_ref (gnu_param_type)))))
5232 gnu_param_type = build_reference_type (gnu_param_type);
5236 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5240 if (mech == By_Copy && (by_ref || by_component_ptr))
5241 post_error ("?cannot pass & by copy", gnat_param);
5243 /* If this is an Out parameter that isn't passed by reference and isn't
5244 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5245 it will be a VAR_DECL created when we process the procedure, so just
5246 return its type. For the special parameter of a valued procedure,
5249 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5250 Out parameters with discriminants or implicit initial values to be
5251 handled like In Out parameters. These type are normally built as
5252 aggregates, hence passed by reference, except for some packed arrays
5253 which end up encoded in special integer types.
5255 The exception we need to make is then for packed arrays of records
5256 with discriminants or implicit initial values. We have no light/easy
5257 way to check for the latter case, so we merely check for packed arrays
5258 of records. This may lead to useless copy-in operations, but in very
5259 rare cases only, as these would be exceptions in a set of already
5260 exceptional situations. */
5261 if (Ekind (gnat_param) == E_Out_Parameter
5264 || (mech != By_Descriptor
5265 && mech != By_Short_Descriptor
5266 && !POINTER_TYPE_P (gnu_param_type)
5267 && !AGGREGATE_TYPE_P (gnu_param_type)))
5268 && !(Is_Array_Type (Etype (gnat_param))
5269 && Is_Packed (Etype (gnat_param))
5270 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5271 return gnu_param_type;
5273 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5274 ro_param || by_ref || by_component_ptr);
5275 DECL_BY_REF_P (gnu_param) = by_ref;
5276 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5277 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5278 mech == By_Short_Descriptor);
5279 DECL_POINTS_TO_READONLY_P (gnu_param)
5280 = (ro_param && (by_ref || by_component_ptr));
5282 /* Save the alternate descriptor type, if any. */
5283 if (gnu_param_type_alt)
5284 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5286 /* If no Mechanism was specified, indicate what we're using, then
5287 back-annotate it. */
5288 if (mech == Default)
5289 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5291 Set_Mechanism (gnat_param, mech);
5295 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5298 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5300 while (Present (Corresponding_Discriminant (discr1)))
5301 discr1 = Corresponding_Discriminant (discr1);
5303 while (Present (Corresponding_Discriminant (discr2)))
5304 discr2 = Corresponding_Discriminant (discr2);
5307 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5310 /* Return true if the array type GNU_TYPE, which represents a dimension of
5311 GNAT_TYPE, has a non-aliased component in the back-end sense. */
5314 array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type)
5316 /* If the array type is not the innermost dimension of the GNAT type,
5317 then it has a non-aliased component. */
5318 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5319 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5322 /* If the array type has an aliased component in the front-end sense,
5323 then it also has an aliased component in the back-end sense. */
5324 if (Has_Aliased_Components (gnat_type))
5327 /* If this is a derived type, then it has a non-aliased component if
5328 and only if its parent type also has one. */
5329 if (Is_Derived_Type (gnat_type))
5331 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type));
5333 if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE)
5335 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type))));
5336 for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--)
5337 gnu_parent_type = TREE_TYPE (gnu_parent_type);
5338 return TYPE_NONALIASED_COMPONENT (gnu_parent_type);
5341 /* Otherwise, rely exclusively on properties of the element type. */
5342 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5345 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5348 compile_time_known_address_p (Node_Id gnat_address)
5350 /* Catch System'To_Address. */
5351 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5352 gnat_address = Expression (gnat_address);
5354 return Compile_Time_Known_Value (gnat_address);
5357 /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e.
5358 cannot verify HB < LB-1 when LB and HB are the low and high bounds. */
5361 cannot_be_superflat_p (Node_Id gnat_range)
5363 Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range);
5364 Node_Id scalar_range;
5366 tree gnu_lb, gnu_hb;
5368 /* If the low bound is not constant, try to find an upper bound. */
5369 while (Nkind (gnat_lb) != N_Integer_Literal
5370 && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype
5371 || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype)
5372 && (scalar_range = Scalar_Range (Etype (gnat_lb)))
5373 && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
5374 || Nkind (scalar_range) == N_Range))
5375 gnat_lb = High_Bound (scalar_range);
5377 /* If the high bound is not constant, try to find a lower bound. */
5378 while (Nkind (gnat_hb) != N_Integer_Literal
5379 && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype
5380 || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype)
5381 && (scalar_range = Scalar_Range (Etype (gnat_hb)))
5382 && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition
5383 || Nkind (scalar_range) == N_Range))
5384 gnat_hb = Low_Bound (scalar_range);
5386 if (!(Nkind (gnat_lb) == N_Integer_Literal
5387 && Nkind (gnat_hb) == N_Integer_Literal))
5390 gnu_lb = UI_To_gnu (Intval (gnat_lb), bitsizetype);
5391 gnu_hb = UI_To_gnu (Intval (gnat_hb), bitsizetype);
5393 /* If the low bound is the smallest integer, nothing can be smaller. */
5394 gnu_lb = size_binop (MINUS_EXPR, gnu_lb, bitsize_one_node);
5395 if (TREE_OVERFLOW (gnu_lb))
5398 return (tree_int_cst_lt (gnu_hb, gnu_lb) == 0);
5401 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5402 be elaborated at the point of its definition, but do nothing else. */
5405 elaborate_entity (Entity_Id gnat_entity)
5407 switch (Ekind (gnat_entity))
5409 case E_Signed_Integer_Subtype:
5410 case E_Modular_Integer_Subtype:
5411 case E_Enumeration_Subtype:
5412 case E_Ordinary_Fixed_Point_Subtype:
5413 case E_Decimal_Fixed_Point_Subtype:
5414 case E_Floating_Point_Subtype:
5416 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5417 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5419 /* ??? Tests to avoid Constraint_Error in static expressions
5420 are needed until after the front stops generating bogus
5421 conversions on bounds of real types. */
5422 if (!Raises_Constraint_Error (gnat_lb))
5423 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5424 true, false, Needs_Debug_Info (gnat_entity));
5425 if (!Raises_Constraint_Error (gnat_hb))
5426 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5427 true, false, Needs_Debug_Info (gnat_entity));
5433 Node_Id full_definition = Declaration_Node (gnat_entity);
5434 Node_Id record_definition = Type_Definition (full_definition);
5436 /* If this is a record extension, go a level further to find the
5437 record definition. */
5438 if (Nkind (record_definition) == N_Derived_Type_Definition)
5439 record_definition = Record_Extension_Part (record_definition);
5443 case E_Record_Subtype:
5444 case E_Private_Subtype:
5445 case E_Limited_Private_Subtype:
5446 case E_Record_Subtype_With_Private:
5447 if (Is_Constrained (gnat_entity)
5448 && Has_Discriminants (gnat_entity)
5449 && Present (Discriminant_Constraint (gnat_entity)))
5451 Node_Id gnat_discriminant_expr;
5452 Entity_Id gnat_field;
5455 = First_Discriminant (Implementation_Base_Type (gnat_entity)),
5456 gnat_discriminant_expr
5457 = First_Elmt (Discriminant_Constraint (gnat_entity));
5458 Present (gnat_field);
5459 gnat_field = Next_Discriminant (gnat_field),
5460 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5461 /* ??? For now, ignore access discriminants. */
5462 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5463 elaborate_expression (Node (gnat_discriminant_expr),
5464 gnat_entity, get_entity_name (gnat_field),
5465 true, false, false);
5472 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5473 any entities on its entity chain similarly. */
5476 mark_out_of_scope (Entity_Id gnat_entity)
5478 Entity_Id gnat_sub_entity;
5479 unsigned int kind = Ekind (gnat_entity);
5481 /* If this has an entity list, process all in the list. */
5482 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5483 || IN (kind, Private_Kind)
5484 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5485 || kind == E_Function || kind == E_Generic_Function
5486 || kind == E_Generic_Package || kind == E_Generic_Procedure
5487 || kind == E_Loop || kind == E_Operator || kind == E_Package
5488 || kind == E_Package_Body || kind == E_Procedure
5489 || kind == E_Record_Type || kind == E_Record_Subtype
5490 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5491 for (gnat_sub_entity = First_Entity (gnat_entity);
5492 Present (gnat_sub_entity);
5493 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5494 if (Scope (gnat_sub_entity) == gnat_entity
5495 && gnat_sub_entity != gnat_entity)
5496 mark_out_of_scope (gnat_sub_entity);
5498 /* Now clear this if it has been defined, but only do so if it isn't
5499 a subprogram or parameter. We could refine this, but it isn't
5500 worth it. If this is statically allocated, it is supposed to
5501 hang around out of cope. */
5502 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5503 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5505 save_gnu_tree (gnat_entity, NULL_TREE, true);
5506 save_gnu_tree (gnat_entity, error_mark_node, true);
5510 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5511 If this is a multi-dimensional array type, do this recursively.
5514 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5515 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5516 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5519 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5521 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5522 of a one-dimensional array, since the padding has the same alias set
5523 as the field type, but if it's a multi-dimensional array, we need to
5524 see the inner types. */
5525 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5526 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5527 || TYPE_PADDING_P (gnu_old_type)))
5528 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5530 /* Unconstrained array types are deemed incomplete and would thus be given
5531 alias set 0. Retrieve the underlying array type. */
5532 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5534 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5535 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5537 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5539 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5540 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5541 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5542 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5546 case ALIAS_SET_COPY:
5547 /* The alias set shouldn't be copied between array types with different
5548 aliasing settings because this can break the aliasing relationship
5549 between the array type and its element type. */
5550 #ifndef ENABLE_CHECKING
5551 if (flag_strict_aliasing)
5553 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5554 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5555 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5556 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5558 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5561 case ALIAS_SET_SUBSET:
5562 case ALIAS_SET_SUPERSET:
5564 alias_set_type old_set = get_alias_set (gnu_old_type);
5565 alias_set_type new_set = get_alias_set (gnu_new_type);
5567 /* Do nothing if the alias sets conflict. This ensures that we
5568 never call record_alias_subset several times for the same pair
5569 or at all for alias set 0. */
5570 if (!alias_sets_conflict_p (old_set, new_set))
5572 if (op == ALIAS_SET_SUBSET)
5573 record_alias_subset (old_set, new_set);
5575 record_alias_subset (new_set, old_set);
5584 record_component_aliases (gnu_new_type);
5587 /* Return true if the size represented by GNU_SIZE can be handled by an
5588 allocation. If STATIC_P is true, consider only what can be done with a
5589 static allocation. */
5592 allocatable_size_p (tree gnu_size, bool static_p)
5594 HOST_WIDE_INT our_size;
5596 /* If this is not a static allocation, the only case we want to forbid
5597 is an overflowing size. That will be converted into a raise a
5600 return !(TREE_CODE (gnu_size) == INTEGER_CST
5601 && TREE_OVERFLOW (gnu_size));
5603 /* Otherwise, we need to deal with both variable sizes and constant
5604 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5605 since assemblers may not like very large sizes. */
5606 if (!host_integerp (gnu_size, 1))
5609 our_size = tree_low_cst (gnu_size, 1);
5610 return (int) our_size == our_size;
5613 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5614 NAME, ARGS and ERROR_POINT. */
5617 prepend_one_attribute_to (struct attrib ** attr_list,
5618 enum attr_type attr_type,
5621 Node_Id attr_error_point)
5623 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5625 attr->type = attr_type;
5626 attr->name = attr_name;
5627 attr->args = attr_args;
5628 attr->error_point = attr_error_point;
5630 attr->next = *attr_list;
5634 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5637 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5641 /* Attributes are stored as Representation Item pragmas. */
5643 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5644 gnat_temp = Next_Rep_Item (gnat_temp))
5645 if (Nkind (gnat_temp) == N_Pragma)
5647 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5648 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5649 enum attr_type etype;
5651 /* Map the kind of pragma at hand. Skip if this is not one
5652 we know how to handle. */
5654 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5656 case Pragma_Machine_Attribute:
5657 etype = ATTR_MACHINE_ATTRIBUTE;
5660 case Pragma_Linker_Alias:
5661 etype = ATTR_LINK_ALIAS;
5664 case Pragma_Linker_Section:
5665 etype = ATTR_LINK_SECTION;
5668 case Pragma_Linker_Constructor:
5669 etype = ATTR_LINK_CONSTRUCTOR;
5672 case Pragma_Linker_Destructor:
5673 etype = ATTR_LINK_DESTRUCTOR;
5676 case Pragma_Weak_External:
5677 etype = ATTR_WEAK_EXTERNAL;
5680 case Pragma_Thread_Local_Storage:
5681 etype = ATTR_THREAD_LOCAL_STORAGE;
5688 /* See what arguments we have and turn them into GCC trees for
5689 attribute handlers. These expect identifier for strings. We
5690 handle at most two arguments, static expressions only. */
5692 if (Present (gnat_assoc) && Present (First (gnat_assoc)))
5694 Node_Id gnat_arg0 = Next (First (gnat_assoc));
5695 Node_Id gnat_arg1 = Empty;
5697 if (Present (gnat_arg0)
5698 && Is_Static_Expression (Expression (gnat_arg0)))
5700 gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0));
5702 if (TREE_CODE (gnu_arg0) == STRING_CST)
5703 gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0));
5705 gnat_arg1 = Next (gnat_arg0);
5708 if (Present (gnat_arg1)
5709 && Is_Static_Expression (Expression (gnat_arg1)))
5711 gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1));
5713 if (TREE_CODE (gnu_arg1) == STRING_CST)
5714 gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1));
5718 /* Prepend to the list now. Make a list of the argument we might
5719 have, as GCC expects it. */
5720 prepend_one_attribute_to
5723 (gnu_arg1 != NULL_TREE)
5724 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5725 Present (Next (First (gnat_assoc)))
5726 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5730 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5731 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5732 return the GCC tree to use for that expression. GNU_NAME is the suffix
5733 to use if a variable needs to be created and DEFINITION is true if this
5734 is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result;
5735 otherwise, we are just elaborating the expression for side-effects. If
5736 NEED_DEBUG is true, we need a variable for debugging purposes even if it
5737 isn't needed for code generation. */
5740 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name,
5741 bool definition, bool need_value, bool need_debug)
5745 /* If we already elaborated this expression (e.g. it was involved
5746 in the definition of a private type), use the old value. */
5747 if (present_gnu_tree (gnat_expr))
5748 return get_gnu_tree (gnat_expr);
5750 /* If we don't need a value and this is static or a discriminant,
5751 we don't need to do anything. */
5753 && (Is_OK_Static_Expression (gnat_expr)
5754 || (Nkind (gnat_expr) == N_Identifier
5755 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5758 /* If it's a static expression, we don't need a variable for debugging. */
5759 if (need_debug && Is_OK_Static_Expression (gnat_expr))
5762 /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */
5763 gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity,
5764 gnu_name, definition, need_debug);
5766 /* Save the expression in case we try to elaborate this entity again. Since
5767 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5768 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5769 save_gnu_tree (gnat_expr, gnu_expr, true);
5771 return need_value ? gnu_expr : error_mark_node;
5774 /* Similar, but take a GNU expression and always return a result. */
5777 elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
5778 bool definition, bool need_debug)
5780 /* Skip any conversions and simple arithmetics to see if the expression
5781 is a read-only variable.
5782 ??? This really should remain read-only, but we have to think about
5783 the typing of the tree here. */
5785 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5786 tree gnu_decl = NULL_TREE;
5787 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5790 /* In most cases, we won't see a naked FIELD_DECL because a discriminant
5791 reference will have been replaced with a COMPONENT_REF when the type
5792 is being elaborated. However, there are some cases involving child
5793 types where we will. So convert it to a COMPONENT_REF. We hope it
5794 will be at the highest level of the expression in these cases. */
5795 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5796 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5797 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5798 gnu_expr, NULL_TREE);
5800 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5801 that is read-only, make a variable that is initialized to contain the
5802 bound when the package containing the definition is elaborated. If
5803 this entity is defined at top level and a bound or discriminant value
5804 isn't a constant or a reference to a discriminant, replace the bound
5805 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5806 rely here on the fact that an expression cannot contain both the
5807 discriminant and some other variable. */
5808 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5809 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5810 && (TREE_READONLY (gnu_inner_expr)
5811 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5812 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5814 /* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */
5815 if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr))
5818 /* Now create the variable if we need it. */
5819 if (need_debug || (expr_variable && expr_global))
5821 = create_var_decl (create_concat_name (gnat_entity,
5822 IDENTIFIER_POINTER (gnu_name)),
5823 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5824 !need_debug, Is_Public (gnat_entity),
5825 !definition, false, NULL, gnat_entity);
5827 /* We only need to use this variable if we are in global context since GCC
5828 can do the right thing in the local case. */
5829 if (expr_global && expr_variable)
5832 return expr_variable ? gnat_save_expr (gnu_expr) : gnu_expr;
5835 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5836 starting bit position so that it is aligned to ALIGN bits, and leaving at
5837 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5838 record is guaranteed to get. */
5841 make_aligning_type (tree type, unsigned int align, tree size,
5842 unsigned int base_align, int room)
5844 /* We will be crafting a record type with one field at a position set to be
5845 the next multiple of ALIGN past record'address + room bytes. We use a
5846 record placeholder to express record'address. */
5848 tree record_type = make_node (RECORD_TYPE);
5849 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5852 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5854 /* The diagram below summarizes the shape of what we manipulate:
5856 <--------- pos ---------->
5857 { +------------+-------------+-----------------+
5858 record =>{ |############| ... | field (type) |
5859 { +------------+-------------+-----------------+
5860 |<-- room -->|<- voffset ->|<---- size ----->|
5863 record_addr vblock_addr
5865 Every length is in sizetype bytes there, except "pos" which has to be
5866 set as a bit position in the GCC tree for the record. */
5868 tree room_st = size_int (room);
5869 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5870 tree voffset_st, pos, field;
5872 tree name = TYPE_NAME (type);
5874 if (TREE_CODE (name) == TYPE_DECL)
5875 name = DECL_NAME (name);
5877 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5879 /* Compute VOFFSET and then POS. The next byte position multiple of some
5880 alignment after some address is obtained by "and"ing the alignment minus
5881 1 with the two's complement of the address. */
5883 voffset_st = size_binop (BIT_AND_EXPR,
5884 size_diffop (size_zero_node, vblock_addr_st),
5885 ssize_int ((align / BITS_PER_UNIT) - 1));
5887 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5889 pos = size_binop (MULT_EXPR,
5890 convert (bitsizetype,
5891 size_binop (PLUS_EXPR, room_st, voffset_st)),
5894 /* Craft the GCC record representation. We exceptionally do everything
5895 manually here because 1) our generic circuitry is not quite ready to
5896 handle the complex position/size expressions we are setting up, 2) we
5897 have a strong simplifying factor at hand: we know the maximum possible
5898 value of voffset, and 3) we have to set/reset at least the sizes in
5899 accordance with this maximum value anyway, as we need them to convey
5900 what should be "alloc"ated for this type.
5902 Use -1 as the 'addressable' indication for the field to prevent the
5903 creation of a bitfield. We don't need one, it would have damaging
5904 consequences on the alignment computation, and create_field_decl would
5905 make one without this special argument, for instance because of the
5906 complex position expression. */
5908 field = create_field_decl (get_identifier ("F"), type, record_type,
5910 TYPE_FIELDS (record_type) = field;
5912 TYPE_ALIGN (record_type) = base_align;
5913 TYPE_USER_ALIGN (record_type) = 1;
5915 TYPE_SIZE (record_type)
5916 = size_binop (PLUS_EXPR,
5917 size_binop (MULT_EXPR, convert (bitsizetype, size),
5919 bitsize_int (align + room * BITS_PER_UNIT));
5920 TYPE_SIZE_UNIT (record_type)
5921 = size_binop (PLUS_EXPR, size,
5922 size_int (room + align / BITS_PER_UNIT));
5924 SET_TYPE_MODE (record_type, BLKmode);
5926 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5930 /* Return the result of rounding T up to ALIGN. */
5932 static inline unsigned HOST_WIDE_INT
5933 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5941 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5942 as the field type of a packed record if IN_RECORD is true, or as the
5943 component type of a packed array if IN_RECORD is false. See if we can
5944 rewrite it either as a type that has a non-BLKmode, which we can pack
5945 tighter in the packed record case, or as a smaller type. If so, return
5946 the new type. If not, return the original type. */
5949 make_packable_type (tree type, bool in_record)
5951 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5952 unsigned HOST_WIDE_INT new_size;
5953 tree new_type, old_field, field_list = NULL_TREE;
5955 /* No point in doing anything if the size is zero. */
5959 new_type = make_node (TREE_CODE (type));
5961 /* Copy the name and flags from the old type to that of the new.
5962 Note that we rely on the pointer equality created here for
5963 TYPE_NAME to look through conversions in various places. */
5964 TYPE_NAME (new_type) = TYPE_NAME (type);
5965 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5966 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5967 if (TREE_CODE (type) == RECORD_TYPE)
5968 TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type);
5970 /* If we are in a record and have a small size, set the alignment to
5971 try for an integral mode. Otherwise set it to try for a smaller
5972 type with BLKmode. */
5973 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5975 TYPE_ALIGN (new_type) = ceil_alignment (size);
5976 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5980 unsigned HOST_WIDE_INT align;
5982 /* Do not try to shrink the size if the RM size is not constant. */
5983 if (TYPE_CONTAINS_TEMPLATE_P (type)
5984 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5987 /* Round the RM size up to a unit boundary to get the minimal size
5988 for a BLKmode record. Give up if it's already the size. */
5989 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5990 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5991 if (new_size == size)
5994 align = new_size & -new_size;
5995 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5998 TYPE_USER_ALIGN (new_type) = 1;
6000 /* Now copy the fields, keeping the position and size as we don't want
6001 to change the layout by propagating the packedness downwards. */
6002 for (old_field = TYPE_FIELDS (type); old_field;
6003 old_field = TREE_CHAIN (old_field))
6005 tree new_field_type = TREE_TYPE (old_field);
6006 tree new_field, new_size;
6008 if ((TREE_CODE (new_field_type) == RECORD_TYPE
6009 || TREE_CODE (new_field_type) == UNION_TYPE
6010 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
6011 && !TYPE_FAT_POINTER_P (new_field_type)
6012 && host_integerp (TYPE_SIZE (new_field_type), 1))
6013 new_field_type = make_packable_type (new_field_type, true);
6015 /* However, for the last field in a not already packed record type
6016 that is of an aggregate type, we need to use the RM size in the
6017 packable version of the record type, see finish_record_type. */
6018 if (!TREE_CHAIN (old_field)
6019 && !TYPE_PACKED (type)
6020 && (TREE_CODE (new_field_type) == RECORD_TYPE
6021 || TREE_CODE (new_field_type) == UNION_TYPE
6022 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
6023 && !TYPE_FAT_POINTER_P (new_field_type)
6024 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
6025 && TYPE_ADA_SIZE (new_field_type))
6026 new_size = TYPE_ADA_SIZE (new_field_type);
6028 new_size = DECL_SIZE (old_field);
6030 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
6031 new_type, TYPE_PACKED (type), new_size,
6032 bit_position (old_field),
6033 !DECL_NONADDRESSABLE_P (old_field));
6035 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
6036 SET_DECL_ORIGINAL_FIELD
6037 (new_field, (DECL_ORIGINAL_FIELD (old_field)
6038 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
6040 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
6041 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
6043 TREE_CHAIN (new_field) = field_list;
6044 field_list = new_field;
6047 finish_record_type (new_type, nreverse (field_list), 2, false);
6048 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
6050 /* If this is a padding record, we never want to make the size smaller
6051 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
6052 if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE)
6054 TYPE_SIZE (new_type) = TYPE_SIZE (type);
6055 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
6060 TYPE_SIZE (new_type) = bitsize_int (new_size);
6061 TYPE_SIZE_UNIT (new_type)
6062 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
6065 if (!TYPE_CONTAINS_TEMPLATE_P (type))
6066 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
6068 compute_record_mode (new_type);
6070 /* Try harder to get a packable type if necessary, for example
6071 in case the record itself contains a BLKmode field. */
6072 if (in_record && TYPE_MODE (new_type) == BLKmode)
6073 SET_TYPE_MODE (new_type,
6074 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
6076 /* If neither the mode nor the size has shrunk, return the old type. */
6077 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
6083 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
6084 if needed. We have already verified that SIZE and TYPE are large enough.
6085 GNAT_ENTITY is used to name the resulting record and to issue a warning.
6086 IS_COMPONENT_TYPE is true if this is being done for the component type
6087 of an array. IS_USER_TYPE is true if we must complete the original type.
6088 DEFINITION is true if this type is being defined. SAME_RM_SIZE is true
6089 if the RM size of the resulting type is to be set to SIZE too; otherwise,
6090 it's set to the RM size of the original type. */
6093 maybe_pad_type (tree type, tree size, unsigned int align,
6094 Entity_Id gnat_entity, bool is_component_type,
6095 bool is_user_type, bool definition, bool same_rm_size)
6097 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
6098 tree orig_size = TYPE_SIZE (type);
6101 /* If TYPE is a padded type, see if it agrees with any size and alignment
6102 we were given. If so, return the original type. Otherwise, strip
6103 off the padding, since we will either be returning the inner type
6104 or repadding it. If no size or alignment is specified, use that of
6105 the original padded type. */
6106 if (TYPE_IS_PADDING_P (type))
6109 || operand_equal_p (round_up (size,
6110 MAX (align, TYPE_ALIGN (type))),
6111 round_up (TYPE_SIZE (type),
6112 MAX (align, TYPE_ALIGN (type))),
6114 && (align == 0 || align == TYPE_ALIGN (type)))
6118 size = TYPE_SIZE (type);
6120 align = TYPE_ALIGN (type);
6122 type = TREE_TYPE (TYPE_FIELDS (type));
6123 orig_size = TYPE_SIZE (type);
6126 /* If the size is either not being changed or is being made smaller (which
6127 is not done here and is only valid for bitfields anyway), show the size
6128 isn't changing. Likewise, clear the alignment if it isn't being
6129 changed. Then return if we aren't doing anything. */
6131 && (operand_equal_p (size, orig_size, 0)
6132 || (TREE_CODE (orig_size) == INTEGER_CST
6133 && tree_int_cst_lt (size, orig_size))))
6136 if (align == TYPE_ALIGN (type))
6139 if (align == 0 && !size)
6142 /* If requested, complete the original type and give it a name. */
6144 create_type_decl (get_entity_name (gnat_entity), type,
6145 NULL, !Comes_From_Source (gnat_entity),
6147 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6148 && DECL_IGNORED_P (TYPE_NAME (type))),
6151 /* We used to modify the record in place in some cases, but that could
6152 generate incorrect debugging information. So make a new record
6154 record = make_node (RECORD_TYPE);
6155 TYPE_PADDING_P (record) = 1;
6157 if (Present (gnat_entity))
6158 TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD");
6160 TYPE_VOLATILE (record)
6161 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6163 TYPE_ALIGN (record) = align;
6164 TYPE_SIZE (record) = size ? size : orig_size;
6165 TYPE_SIZE_UNIT (record)
6166 = convert (sizetype,
6167 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6168 bitsize_unit_node));
6170 /* If we are changing the alignment and the input type is a record with
6171 BLKmode and a small constant size, try to make a form that has an
6172 integral mode. This might allow the padding record to also have an
6173 integral mode, which will be much more efficient. There is no point
6174 in doing so if a size is specified unless it is also a small constant
6175 size and it is incorrect to do so if we cannot guarantee that the mode
6176 will be naturally aligned since the field must always be addressable.
6178 ??? This might not always be a win when done for a stand-alone object:
6179 since the nominal and the effective type of the object will now have
6180 different modes, a VIEW_CONVERT_EXPR will be required for converting
6181 between them and it might be hard to overcome afterwards, including
6182 at the RTL level when the stand-alone object is accessed as a whole. */
6184 && TREE_CODE (type) == RECORD_TYPE
6185 && TYPE_MODE (type) == BLKmode
6186 && TREE_CODE (orig_size) == INTEGER_CST
6187 && !TREE_OVERFLOW (orig_size)
6188 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6190 || (TREE_CODE (size) == INTEGER_CST
6191 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6193 tree packable_type = make_packable_type (type, true);
6194 if (TYPE_MODE (packable_type) != BLKmode
6195 && align >= TYPE_ALIGN (packable_type))
6196 type = packable_type;
6199 /* Now create the field with the original size. */
6200 field = create_field_decl (get_identifier ("F"), type, record, 0,
6201 orig_size, bitsize_zero_node, 1);
6202 DECL_INTERNAL_P (field) = 1;
6204 /* Do not emit debug info until after the auxiliary record is built. */
6205 finish_record_type (record, field, 1, false);
6207 /* Set the same size for its RM size if requested; otherwise reuse
6208 the RM size of the original type. */
6209 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6211 /* Unless debugging information isn't being written for the input type,
6212 write a record that shows what we are a subtype of and also make a
6213 variable that indicates our size, if still variable. */
6214 if (TREE_CODE (orig_size) != INTEGER_CST
6215 && TYPE_NAME (record)
6217 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6218 && DECL_IGNORED_P (TYPE_NAME (type))))
6220 tree marker = make_node (RECORD_TYPE);
6221 tree name = TYPE_NAME (record);
6222 tree orig_name = TYPE_NAME (type);
6224 if (TREE_CODE (name) == TYPE_DECL)
6225 name = DECL_NAME (name);
6227 if (TREE_CODE (orig_name) == TYPE_DECL)
6228 orig_name = DECL_NAME (orig_name);
6230 TYPE_NAME (marker) = concat_name (name, "XVS");
6231 finish_record_type (marker,
6232 create_field_decl (orig_name,
6233 build_reference_type (type),
6234 marker, 0, NULL_TREE, NULL_TREE,
6238 add_parallel_type (TYPE_STUB_DECL (record), marker);
6240 if (definition && size && TREE_CODE (size) != INTEGER_CST)
6241 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6242 TYPE_SIZE_UNIT (record), false, false, false,
6243 false, NULL, gnat_entity);
6246 rest_of_record_type_compilation (record);
6248 /* If the size was widened explicitly, maybe give a warning. Take the
6249 original size as the maximum size of the input if there was an
6250 unconstrained record involved and round it up to the specified alignment,
6251 if one was specified. */
6252 if (CONTAINS_PLACEHOLDER_P (orig_size))
6253 orig_size = max_size (orig_size, true);
6256 orig_size = round_up (orig_size, align);
6258 if (Present (gnat_entity)
6260 && TREE_CODE (size) != MAX_EXPR
6261 && !operand_equal_p (size, orig_size, 0)
6262 && !(TREE_CODE (size) == INTEGER_CST
6263 && TREE_CODE (orig_size) == INTEGER_CST
6264 && tree_int_cst_lt (size, orig_size)))
6266 Node_Id gnat_error_node = Empty;
6268 if (Is_Packed_Array_Type (gnat_entity))
6269 gnat_entity = Original_Array_Type (gnat_entity);
6271 if ((Ekind (gnat_entity) == E_Component
6272 || Ekind (gnat_entity) == E_Discriminant)
6273 && Present (Component_Clause (gnat_entity)))
6274 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6275 else if (Present (Size_Clause (gnat_entity)))
6276 gnat_error_node = Expression (Size_Clause (gnat_entity));
6278 /* Generate message only for entities that come from source, since
6279 if we have an entity created by expansion, the message will be
6280 generated for some other corresponding source entity. */
6281 if (Comes_From_Source (gnat_entity))
6283 if (Present (gnat_error_node))
6284 post_error_ne_tree ("{^ }bits of & unused?",
6285 gnat_error_node, gnat_entity,
6286 size_diffop (size, orig_size));
6287 else if (is_component_type)
6288 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6289 gnat_entity, gnat_entity,
6290 size_diffop (size, orig_size));
6297 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6298 the value passed against the list of choices. */
6301 choices_to_gnu (tree operand, Node_Id choices)
6305 tree result = integer_zero_node;
6306 tree this_test, low = 0, high = 0, single = 0;
6308 for (choice = First (choices); Present (choice); choice = Next (choice))
6310 switch (Nkind (choice))
6313 low = gnat_to_gnu (Low_Bound (choice));
6314 high = gnat_to_gnu (High_Bound (choice));
6316 /* There's no good type to use here, so we might as well use
6317 integer_type_node. */
6319 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6320 build_binary_op (GE_EXPR, integer_type_node,
6322 build_binary_op (LE_EXPR, integer_type_node,
6327 case N_Subtype_Indication:
6328 gnat_temp = Range_Expression (Constraint (choice));
6329 low = gnat_to_gnu (Low_Bound (gnat_temp));
6330 high = gnat_to_gnu (High_Bound (gnat_temp));
6333 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6334 build_binary_op (GE_EXPR, integer_type_node,
6336 build_binary_op (LE_EXPR, integer_type_node,
6341 case N_Expanded_Name:
6342 /* This represents either a subtype range, an enumeration
6343 literal, or a constant Ekind says which. If an enumeration
6344 literal or constant, fall through to the next case. */
6345 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6346 && Ekind (Entity (choice)) != E_Constant)
6348 tree type = gnat_to_gnu_type (Entity (choice));
6350 low = TYPE_MIN_VALUE (type);
6351 high = TYPE_MAX_VALUE (type);
6354 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6355 build_binary_op (GE_EXPR, integer_type_node,
6357 build_binary_op (LE_EXPR, integer_type_node,
6362 /* ... fall through ... */
6364 case N_Character_Literal:
6365 case N_Integer_Literal:
6366 single = gnat_to_gnu (choice);
6367 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6371 case N_Others_Choice:
6372 this_test = integer_one_node;
6379 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6386 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6387 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6390 adjust_packed (tree field_type, tree record_type, int packed)
6392 /* If the field contains an item of variable size, we cannot pack it
6393 because we cannot create temporaries of non-fixed size in case
6394 we need to take the address of the field. See addressable_p and
6395 the notes on the addressability issues for further details. */
6396 if (is_variable_size (field_type))
6399 /* If the alignment of the record is specified and the field type
6400 is over-aligned, request Storage_Unit alignment for the field. */
6403 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6412 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6413 placed in GNU_RECORD_TYPE.
6415 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6416 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6417 record has a specified alignment.
6419 DEFINITION is true if this field is for a record being defined.
6421 DEBUG_INFO_P is true if we need to write debug information for types
6422 that we may create in the process. */
6425 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6426 bool definition, bool debug_info_p)
6428 tree gnu_field_id = get_entity_name (gnat_field);
6429 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6430 tree gnu_field, gnu_size, gnu_pos;
6431 bool needs_strict_alignment
6432 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6433 || Treat_As_Volatile (gnat_field));
6435 /* If this field requires strict alignment, we cannot pack it because
6436 it would very likely be under-aligned in the record. */
6437 if (needs_strict_alignment)
6440 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6442 /* If a size is specified, use it. Otherwise, if the record type is packed,
6443 use the official RM size. See "Handling of Type'Size Values" in Einfo
6444 for further details. */
6445 if (Known_Static_Esize (gnat_field))
6446 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6447 gnat_field, FIELD_DECL, false, true);
6448 else if (packed == 1)
6449 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6450 gnat_field, FIELD_DECL, false, true);
6452 gnu_size = NULL_TREE;
6454 /* If we have a specified size that is smaller than that of the field's type,
6455 or a position is specified, and the field's type is a record that doesn't
6456 require strict alignment, see if we can get either an integral mode form
6457 of the type or a smaller form. If we can, show a size was specified for
6458 the field if there wasn't one already, so we know to make this a bitfield
6459 and avoid making things wider.
6461 Changing to an integral mode form is useful when the record is packed as
6462 we can then place the field at a non-byte-aligned position and so achieve
6463 tighter packing. This is in addition required if the field shares a byte
6464 with another field and the front-end lets the back-end handle the access
6465 to the field, because GCC cannot handle non-byte-aligned BLKmode fields.
6467 Changing to a smaller form is required if the specified size is smaller
6468 than that of the field's type and the type contains sub-fields that are
6469 padded, in order to avoid generating accesses to these sub-fields that
6470 are wider than the field.
6472 We avoid the transformation if it is not required or potentially useful,
6473 as it might entail an increase of the field's alignment and have ripple
6474 effects on the outer record type. A typical case is a field known to be
6475 byte-aligned and not to share a byte with another field. */
6476 if (!needs_strict_alignment
6477 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6478 && !TYPE_FAT_POINTER_P (gnu_field_type)
6479 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6482 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6483 || (Present (Component_Clause (gnat_field))
6484 && !(UI_To_Int (Component_Bit_Offset (gnat_field))
6485 % BITS_PER_UNIT == 0
6486 && value_factor_p (gnu_size, BITS_PER_UNIT)))))))
6488 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6489 if (gnu_packable_type != gnu_field_type)
6491 gnu_field_type = gnu_packable_type;
6493 gnu_size = rm_size (gnu_field_type);
6497 /* If we are packing the record and the field is BLKmode, round the
6498 size up to a byte boundary. */
6499 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6500 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6502 if (Present (Component_Clause (gnat_field)))
6504 Entity_Id gnat_parent
6505 = Parent_Subtype (Underlying_Type (Scope (gnat_field)));
6507 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6508 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6509 gnat_field, FIELD_DECL, false, true);
6511 /* Ensure the position does not overlap with the parent subtype, if there
6512 is one. This test is omitted if the parent of the tagged type has a
6513 full rep clause since, in this case, component clauses are allowed to
6514 overlay the space allocated for the parent type and the front-end has
6515 checked that there are no overlapping components. */
6516 if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent))
6518 tree gnu_parent = gnat_to_gnu_type (gnat_parent);
6520 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6521 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6524 ("offset of& must be beyond parent{, minimum allowed is ^}",
6525 First_Bit (Component_Clause (gnat_field)), gnat_field,
6526 TYPE_SIZE_UNIT (gnu_parent));
6530 /* If this field needs strict alignment, ensure the record is
6531 sufficiently aligned and that that position and size are
6532 consistent with the alignment. */
6533 if (needs_strict_alignment)
6535 TYPE_ALIGN (gnu_record_type)
6536 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6539 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6541 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6543 ("atomic field& must be natural size of type{ (^)}",
6544 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6545 TYPE_SIZE (gnu_field_type));
6547 else if (Is_Aliased (gnat_field))
6549 ("size of aliased field& must be ^ bits",
6550 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6551 TYPE_SIZE (gnu_field_type));
6553 else if (Strict_Alignment (Etype (gnat_field)))
6555 ("size of & with aliased or tagged components not ^ bits",
6556 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6557 TYPE_SIZE (gnu_field_type));
6559 gnu_size = NULL_TREE;
6562 if (!integer_zerop (size_binop
6563 (TRUNC_MOD_EXPR, gnu_pos,
6564 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6566 if (Is_Aliased (gnat_field))
6568 ("position of aliased field& must be multiple of ^ bits",
6569 First_Bit (Component_Clause (gnat_field)), gnat_field,
6570 TYPE_ALIGN (gnu_field_type));
6572 else if (Treat_As_Volatile (gnat_field))
6574 ("position of volatile field& must be multiple of ^ bits",
6575 First_Bit (Component_Clause (gnat_field)), gnat_field,
6576 TYPE_ALIGN (gnu_field_type));
6578 else if (Strict_Alignment (Etype (gnat_field)))
6580 ("position of & with aliased or tagged components not multiple of ^ bits",
6581 First_Bit (Component_Clause (gnat_field)), gnat_field,
6582 TYPE_ALIGN (gnu_field_type));
6587 gnu_pos = NULL_TREE;
6591 if (Is_Atomic (gnat_field))
6592 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6595 /* If the record has rep clauses and this is the tag field, make a rep
6596 clause for it as well. */
6597 else if (Has_Specified_Layout (Scope (gnat_field))
6598 && Chars (gnat_field) == Name_uTag)
6600 gnu_pos = bitsize_zero_node;
6601 gnu_size = TYPE_SIZE (gnu_field_type);
6605 gnu_pos = NULL_TREE;
6607 /* We need to make the size the maximum for the type if it is
6608 self-referential and an unconstrained type. In that case, we can't
6609 pack the field since we can't make a copy to align it. */
6610 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6612 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6613 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6615 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6619 /* If a size is specified, adjust the field's type to it. */
6622 tree orig_field_type;
6624 /* If the field's type is justified modular, we would need to remove
6625 the wrapper to (better) meet the layout requirements. However we
6626 can do so only if the field is not aliased to preserve the unique
6627 layout and if the prescribed size is not greater than that of the
6628 packed array to preserve the justification. */
6629 if (!needs_strict_alignment
6630 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6631 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6632 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6634 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6637 = make_type_from_size (gnu_field_type, gnu_size,
6638 Has_Biased_Representation (gnat_field));
6640 orig_field_type = gnu_field_type;
6641 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6642 false, false, definition, true);
6644 /* If a padding record was made, declare it now since it will never be
6645 declared otherwise. This is necessary to ensure that its subtrees
6646 are properly marked. */
6647 if (gnu_field_type != orig_field_type
6648 && !DECL_P (TYPE_NAME (gnu_field_type)))
6649 create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, NULL,
6650 true, debug_info_p, gnat_field);
6653 /* Otherwise (or if there was an error), don't specify a position. */
6655 gnu_pos = NULL_TREE;
6657 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6658 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6660 /* Now create the decl for the field. */
6661 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6662 packed, gnu_size, gnu_pos,
6663 Is_Aliased (gnat_field));
6664 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6665 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6667 if (Ekind (gnat_field) == E_Discriminant)
6668 DECL_DISCRIMINANT_NUMBER (gnu_field)
6669 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6674 /* Return true if TYPE is a type with variable size, a padding type with a
6675 field of variable size or is a record that has a field such a field. */
6678 is_variable_size (tree type)
6682 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6685 if (TYPE_IS_PADDING_P (type)
6686 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6689 if (TREE_CODE (type) != RECORD_TYPE
6690 && TREE_CODE (type) != UNION_TYPE
6691 && TREE_CODE (type) != QUAL_UNION_TYPE)
6694 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6695 if (is_variable_size (TREE_TYPE (field)))
6701 /* qsort comparer for the bit positions of two record components. */
6704 compare_field_bitpos (const PTR rt1, const PTR rt2)
6706 const_tree const field1 = * (const_tree const *) rt1;
6707 const_tree const field2 = * (const_tree const *) rt2;
6709 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6711 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6714 /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set
6715 the result as the field list of GNU_RECORD_TYPE and finish it up. When
6716 called from gnat_to_gnu_entity during the processing of a record type
6717 definition, the GCC node for the parent, if any, will be the single field
6718 of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the
6719 GNU_FIELD_LIST. The other calls to this function are recursive calls for
6720 the component list of a variant and, in this case, GNU_FIELD_LIST is empty.
6722 PACKED is 1 if this is for a packed record, -1 if this is for a record
6723 with Component_Alignment of Storage_Unit, -2 if this is for a record
6724 with a specified alignment.
6726 DEFINITION is true if we are defining this record type.
6728 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6729 with a rep clause is to be added; in this case, that is all that should
6730 be done with such fields.
6732 CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying
6733 out the record. This means the alignment only serves to force fields to
6734 be bitfields, but not to require the record to be that aligned. This is
6737 ALL_REP is true if a rep clause is present for all the fields.
6739 UNCHECKED_UNION is true if we are building this type for a record with a
6740 Pragma Unchecked_Union.
6742 DEBUG_INFO_P is true if we need to write debug information about the type.
6744 MAYBE_UNUSED is true if this type may be unused in the end; this doesn't
6745 mean that its contents may be unused as well, but only the container. */
6749 components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
6750 tree gnu_field_list, int packed, bool definition,
6751 tree *p_gnu_rep_list, bool cancel_alignment,
6752 bool all_rep, bool unchecked_union, bool debug_info_p,
6755 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6756 bool layout_with_rep = false;
6757 Node_Id component_decl, variant_part;
6758 tree gnu_our_rep_list = NULL_TREE;
6759 tree gnu_field, gnu_next, gnu_last = tree_last (gnu_field_list);
6761 /* For each component referenced in a component declaration create a GCC
6762 field and add it to the list, skipping pragmas in the GNAT list. */
6763 if (Present (Component_Items (gnat_component_list)))
6765 = First_Non_Pragma (Component_Items (gnat_component_list));
6766 Present (component_decl);
6767 component_decl = Next_Non_Pragma (component_decl))
6769 Entity_Id gnat_field = Defining_Entity (component_decl);
6770 Name_Id gnat_name = Chars (gnat_field);
6772 /* If present, the _Parent field must have been created as the single
6773 field of the record type. Put it before any other fields. */
6774 if (gnat_name == Name_uParent)
6776 gnu_field = TYPE_FIELDS (gnu_record_type);
6777 gnu_field_list = chainon (gnu_field_list, gnu_field);
6781 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
6782 definition, debug_info_p);
6784 /* If this is the _Tag field, put it before any other fields. */
6785 if (gnat_name == Name_uTag)
6786 gnu_field_list = chainon (gnu_field_list, gnu_field);
6788 /* If this is the _Controller field, put it before the other
6789 fields except for the _Tag or _Parent field. */
6790 else if (gnat_name == Name_uController && gnu_last)
6792 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
6793 TREE_CHAIN (gnu_last) = gnu_field;
6796 /* If this is a regular field, put it after the other fields. */
6799 TREE_CHAIN (gnu_field) = gnu_field_list;
6800 gnu_field_list = gnu_field;
6802 gnu_last = gnu_field;
6806 save_gnu_tree (gnat_field, gnu_field, false);
6809 /* At the end of the component list there may be a variant part. */
6810 variant_part = Variant_Part (gnat_component_list);
6812 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6813 mutually exclusive and should go in the same memory. To do this we need
6814 to treat each variant as a record whose elements are created from the
6815 component list for the variant. So here we create the records from the
6816 lists for the variants and put them all into the QUAL_UNION_TYPE.
6817 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6818 use GNU_RECORD_TYPE if there are no fields so far. */
6819 if (Present (variant_part))
6821 Node_Id gnat_discr = Name (variant_part), variant;
6822 tree gnu_discr = gnat_to_gnu (gnat_discr);
6823 tree gnu_name = TYPE_NAME (gnu_record_type);
6825 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6827 tree gnu_union_type, gnu_union_name, gnu_union_field;
6828 tree gnu_variant_list = NULL_TREE;
6830 if (TREE_CODE (gnu_name) == TYPE_DECL)
6831 gnu_name = DECL_NAME (gnu_name);
6834 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6836 /* Reuse an enclosing union if all fields are in the variant part
6837 and there is no representation clause on the record, to match
6838 the layout of C unions. There is an associated check below. */
6840 && TREE_CODE (gnu_record_type) == UNION_TYPE
6841 && !TYPE_PACKED (gnu_record_type))
6842 gnu_union_type = gnu_record_type;
6846 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6848 TYPE_NAME (gnu_union_type) = gnu_union_name;
6849 TYPE_ALIGN (gnu_union_type) = 0;
6850 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6853 for (variant = First_Non_Pragma (Variants (variant_part));
6855 variant = Next_Non_Pragma (variant))
6857 tree gnu_variant_type = make_node (RECORD_TYPE);
6858 tree gnu_inner_name;
6861 Get_Variant_Encoding (variant);
6862 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6863 TYPE_NAME (gnu_variant_type)
6864 = concat_name (gnu_union_name,
6865 IDENTIFIER_POINTER (gnu_inner_name));
6867 /* Set the alignment of the inner type in case we need to make
6868 inner objects into bitfields, but then clear it out so the
6869 record actually gets only the alignment required. */
6870 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6871 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6873 /* Similarly, if the outer record has a size specified and all
6874 fields have record rep clauses, we can propagate the size
6875 into the variant part. */
6876 if (all_rep_and_size)
6878 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6879 TYPE_SIZE_UNIT (gnu_variant_type)
6880 = TYPE_SIZE_UNIT (gnu_record_type);
6883 /* Add the fields into the record type for the variant. Note that
6884 we aren't sure to really use it at this point, see below. */
6885 components_to_record (gnu_variant_type, Component_List (variant),
6886 NULL_TREE, packed, definition,
6887 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6888 unchecked_union, debug_info_p, true);
6890 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6892 Set_Present_Expr (variant, annotate_value (gnu_qual));
6894 /* If this is an Unchecked_Union and we have exactly one field,
6895 use this field directly to match the layout of C unions. */
6897 && TYPE_FIELDS (gnu_variant_type)
6898 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6899 gnu_field = TYPE_FIELDS (gnu_variant_type);
6902 /* Deal with packedness like in gnat_to_gnu_field. */
6904 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6906 /* Finalize the record type now. We used to throw away
6907 empty records but we no longer do that because we need
6908 them to generate complete debug info for the variant;
6909 otherwise, the union type definition will be lacking
6910 the fields associated with these empty variants. */
6911 rest_of_record_type_compilation (gnu_variant_type);
6912 create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type,
6913 NULL, true, debug_info_p, gnat_component_list);
6915 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6916 gnu_union_type, field_packed,
6918 ? TYPE_SIZE (gnu_variant_type)
6921 ? bitsize_zero_node : 0),
6924 DECL_INTERNAL_P (gnu_field) = 1;
6926 if (!unchecked_union)
6927 DECL_QUALIFIER (gnu_field) = gnu_qual;
6930 TREE_CHAIN (gnu_field) = gnu_variant_list;
6931 gnu_variant_list = gnu_field;
6934 /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */
6935 if (gnu_variant_list)
6937 int union_field_packed;
6939 if (all_rep_and_size)
6941 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6942 TYPE_SIZE_UNIT (gnu_union_type)
6943 = TYPE_SIZE_UNIT (gnu_record_type);
6946 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6947 all_rep_and_size ? 1 : 0, debug_info_p);
6949 /* If GNU_UNION_TYPE is our record type, it means we must have an
6950 Unchecked_Union with no fields. Verify that and, if so, just
6952 if (gnu_union_type == gnu_record_type)
6954 gcc_assert (unchecked_union
6956 && !gnu_our_rep_list);
6960 create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type,
6961 NULL, true, debug_info_p, gnat_component_list);
6963 /* Deal with packedness like in gnat_to_gnu_field. */
6965 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6968 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6970 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6971 all_rep ? bitsize_zero_node : 0, 0);
6973 DECL_INTERNAL_P (gnu_union_field) = 1;
6974 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6975 gnu_field_list = gnu_union_field;
6979 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6980 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do
6981 this in a separate pass since we want to handle the discriminants but
6982 can't play with them until we've used them in debugging data above.
6984 ??? If we then reorder them, debugging information will be wrong but
6985 there's nothing that can be done about this at the moment. */
6986 gnu_last = NULL_TREE;
6987 for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next)
6989 gnu_next = TREE_CHAIN (gnu_field);
6991 if (DECL_FIELD_OFFSET (gnu_field))
6994 gnu_field_list = gnu_next;
6996 TREE_CHAIN (gnu_last) = gnu_next;
6998 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6999 gnu_our_rep_list = gnu_field;
7002 gnu_last = gnu_field;
7005 /* If we have any fields in our rep'ed field list and it is not the case that
7006 all the fields in the record have rep clauses and P_REP_LIST is nonzero,
7007 set it and ignore these fields. */
7008 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
7009 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
7011 /* Otherwise, sort the fields by bit position and put them into their own
7012 record, before the others, if we also have fields without rep clauses. */
7013 else if (gnu_our_rep_list)
7016 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
7017 int i, len = list_length (gnu_our_rep_list);
7018 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
7020 for (gnu_field = gnu_our_rep_list, i = 0;
7022 gnu_field = TREE_CHAIN (gnu_field), i++)
7023 gnu_arr[i] = gnu_field;
7025 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
7027 /* Put the fields in the list in order of increasing position, which
7028 means we start from the end. */
7029 gnu_our_rep_list = NULL_TREE;
7030 for (i = len - 1; i >= 0; i--)
7032 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
7033 gnu_our_rep_list = gnu_arr[i];
7034 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
7039 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, debug_info_p);
7041 = create_field_decl (get_identifier ("REP"), gnu_rep_type,
7042 gnu_record_type, 0, NULL_TREE, NULL_TREE, 1);
7043 DECL_INTERNAL_P (gnu_field) = 1;
7044 gnu_field_list = chainon (gnu_field_list, gnu_field);
7048 layout_with_rep = true;
7049 gnu_field_list = nreverse (gnu_our_rep_list);
7053 if (cancel_alignment)
7054 TYPE_ALIGN (gnu_record_type) = 0;
7056 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
7057 layout_with_rep ? 1 : 0, debug_info_p && !maybe_unused);
7060 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
7061 placed into an Esize, Component_Bit_Offset, or Component_Size value
7062 in the GNAT tree. */
7065 annotate_value (tree gnu_size)
7067 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
7069 Node_Ref_Or_Val ops[3], ret;
7072 struct tree_int_map **h = NULL;
7074 /* See if we've already saved the value for this node. */
7075 if (EXPR_P (gnu_size))
7077 struct tree_int_map in;
7078 if (!annotate_value_cache)
7079 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
7080 tree_int_map_eq, 0);
7081 in.base.from = gnu_size;
7082 h = (struct tree_int_map **)
7083 htab_find_slot (annotate_value_cache, &in, INSERT);
7086 return (Node_Ref_Or_Val) (*h)->to;
7089 /* If we do not return inside this switch, TCODE will be set to the
7090 code to use for a Create_Node operand and LEN (set above) will be
7091 the number of recursive calls for us to make. */
7093 switch (TREE_CODE (gnu_size))
7096 if (TREE_OVERFLOW (gnu_size))
7099 /* This may have come from a conversion from some smaller type,
7100 so ensure this is in bitsizetype. */
7101 gnu_size = convert (bitsizetype, gnu_size);
7103 /* For negative values, use NEGATE_EXPR of the supplied value. */
7104 if (tree_int_cst_sgn (gnu_size) < 0)
7106 /* The ridiculous code below is to handle the case of the largest
7107 negative integer. */
7108 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
7109 bool adjust = false;
7112 if (TREE_OVERFLOW (negative_size))
7115 = size_binop (MINUS_EXPR, bitsize_zero_node,
7116 size_binop (PLUS_EXPR, gnu_size,
7121 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
7123 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
7125 return annotate_value (temp);
7128 if (!host_integerp (gnu_size, 1))
7131 size = tree_low_cst (gnu_size, 1);
7133 /* This peculiar test is to make sure that the size fits in an int
7134 on machines where HOST_WIDE_INT is not "int". */
7135 if (tree_low_cst (gnu_size, 1) == size)
7136 return UI_From_Int (size);
7141 /* The only case we handle here is a simple discriminant reference. */
7142 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
7143 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
7144 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7145 return Create_Node (Discrim_Val,
7146 annotate_value (DECL_DISCRIMINANT_NUMBER
7147 (TREE_OPERAND (gnu_size, 1))),
7152 CASE_CONVERT: case NON_LVALUE_EXPR:
7153 return annotate_value (TREE_OPERAND (gnu_size, 0));
7155 /* Now just list the operations we handle. */
7156 case COND_EXPR: tcode = Cond_Expr; break;
7157 case PLUS_EXPR: tcode = Plus_Expr; break;
7158 case MINUS_EXPR: tcode = Minus_Expr; break;
7159 case MULT_EXPR: tcode = Mult_Expr; break;
7160 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7161 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7162 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7163 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7164 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7165 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7166 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7167 case NEGATE_EXPR: tcode = Negate_Expr; break;
7168 case MIN_EXPR: tcode = Min_Expr; break;
7169 case MAX_EXPR: tcode = Max_Expr; break;
7170 case ABS_EXPR: tcode = Abs_Expr; break;
7171 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7172 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7173 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7174 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7175 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7176 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7177 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7178 case LT_EXPR: tcode = Lt_Expr; break;
7179 case LE_EXPR: tcode = Le_Expr; break;
7180 case GT_EXPR: tcode = Gt_Expr; break;
7181 case GE_EXPR: tcode = Ge_Expr; break;
7182 case EQ_EXPR: tcode = Eq_Expr; break;
7183 case NE_EXPR: tcode = Ne_Expr; break;
7187 tree t = maybe_inline_call_in_expr (gnu_size);
7189 return annotate_value (t);
7192 /* Fall through... */
7198 /* Now get each of the operands that's relevant for this code. If any
7199 cannot be expressed as a repinfo node, say we can't. */
7200 for (i = 0; i < 3; i++)
7203 for (i = 0; i < len; i++)
7205 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7206 if (ops[i] == No_Uint)
7210 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7212 /* Save the result in the cache. */
7215 *h = GGC_NEW (struct tree_int_map);
7216 (*h)->base.from = gnu_size;
7223 /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception)
7224 and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the
7225 size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null.
7226 BY_REF is true if the object is used by reference. */
7229 annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref)
7233 if (TYPE_IS_FAT_POINTER_P (gnu_type))
7234 gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type);
7236 gnu_type = TREE_TYPE (gnu_type);
7239 if (Unknown_Esize (gnat_entity))
7241 if (TREE_CODE (gnu_type) == RECORD_TYPE
7242 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7243 size = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
7245 size = TYPE_SIZE (gnu_type);
7248 Set_Esize (gnat_entity, annotate_value (size));
7251 if (Unknown_Alignment (gnat_entity))
7252 Set_Alignment (gnat_entity,
7253 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
7256 /* Return first element of field list whose TREE_PURPOSE is ELEM or whose
7257 DECL_ORIGINAL_FIELD of TREE_PURPOSE is ELEM. Return NULL_TREE if there
7258 is no such element in the list. */
7261 purpose_member_field (const_tree elem, tree list)
7265 tree field = TREE_PURPOSE (list);
7266 if (elem == field || elem == DECL_ORIGINAL_FIELD (field))
7268 list = TREE_CHAIN (list);
7273 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type,
7274 set Component_Bit_Offset and Esize of the components to the position and
7275 size used by Gigi. */
7278 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7280 Entity_Id gnat_field;
7283 /* We operate by first making a list of all fields and their position (we
7284 can get the size easily) and then update all the sizes in the tree. */
7286 = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node,
7287 BIGGEST_ALIGNMENT, NULL_TREE);
7289 for (gnat_field = First_Entity (gnat_entity);
7290 Present (gnat_field);
7291 gnat_field = Next_Entity (gnat_field))
7292 if (Ekind (gnat_field) == E_Component
7293 || (Ekind (gnat_field) == E_Discriminant
7294 && !Is_Unchecked_Union (Scope (gnat_field))))
7296 tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field),
7302 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7304 /* In this mode the tag and parent components are not
7305 generated, so we add the appropriate offset to each
7306 component. For a component appearing in the current
7307 extension, the offset is the size of the parent. */
7308 if (Is_Derived_Type (gnat_entity)
7309 && Original_Record_Component (gnat_field) == gnat_field)
7311 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7314 parent_offset = bitsize_int (POINTER_SIZE);
7317 parent_offset = bitsize_zero_node;
7319 Set_Component_Bit_Offset
7322 (size_binop (PLUS_EXPR,
7323 bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0),
7324 TREE_VEC_ELT (TREE_VALUE (t), 2)),
7327 Set_Esize (gnat_field,
7328 annotate_value (DECL_SIZE (TREE_PURPOSE (t))));
7330 else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity))
7332 /* If there is no entry, this is an inherited component whose
7333 position is the same as in the parent type. */
7334 Set_Component_Bit_Offset
7336 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7338 Set_Esize (gnat_field,
7339 Esize (Original_Record_Component (gnat_field)));
7344 /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is
7345 the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the
7346 value to be placed into DECL_OFFSET_ALIGN and the bit position. The list
7347 of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT
7348 is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the
7349 bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a
7350 pre-existing list to be chained to the newly created entries. */
7353 build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos,
7354 tree gnu_bitpos, unsigned int offset_align, tree gnu_list)
7358 for (gnu_field = TYPE_FIELDS (gnu_type);
7360 gnu_field = TREE_CHAIN (gnu_field))
7362 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7363 DECL_FIELD_BIT_OFFSET (gnu_field));
7364 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7365 DECL_FIELD_OFFSET (gnu_field));
7366 unsigned int our_offset_align
7367 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7368 tree v = make_tree_vec (3);
7370 TREE_VEC_ELT (v, 0) = gnu_our_offset;
7371 TREE_VEC_ELT (v, 1) = size_int (our_offset_align);
7372 TREE_VEC_ELT (v, 2) = gnu_our_bitpos;
7373 gnu_list = tree_cons (gnu_field, v, gnu_list);
7375 /* Recurse on internal fields, flattening the nested fields except for
7376 those in the variant part, if requested. */
7377 if (DECL_INTERNAL_P (gnu_field))
7379 tree gnu_field_type = TREE_TYPE (gnu_field);
7380 if (do_not_flatten_variant
7381 && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE)
7383 = build_position_list (gnu_field_type, do_not_flatten_variant,
7384 size_zero_node, bitsize_zero_node,
7385 BIGGEST_ALIGNMENT, gnu_list);
7388 = build_position_list (gnu_field_type, do_not_flatten_variant,
7389 gnu_our_offset, gnu_our_bitpos,
7390 our_offset_align, gnu_list);
7397 /* Return a TREE_LIST describing the substitutions needed to reflect the
7398 discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can
7399 be in any order. TREE_PURPOSE gives the tree for the discriminant and
7400 TREE_VALUE is the replacement value. They are in the form of operands
7401 to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for a definition
7405 build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition)
7407 tree gnu_list = NULL_TREE;
7408 Entity_Id gnat_discrim;
7411 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
7412 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
7413 Present (gnat_discrim);
7414 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
7415 gnat_value = Next_Elmt (gnat_value))
7416 /* Ignore access discriminants. */
7417 if (!Is_Access_Type (Etype (Node (gnat_value))))
7419 tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim);
7420 gnu_list = tree_cons (gnu_field,
7421 convert (TREE_TYPE (gnu_field),
7422 elaborate_expression
7423 (Node (gnat_value), gnat_subtype,
7424 get_entity_name (gnat_discrim),
7425 definition, true, false)),
7432 /* Scan all fields in QUAL_UNION_TYPE and return a TREE_LIST describing the
7433 variants of QUAL_UNION_TYPE that are still relevant after applying the
7434 substitutions described in SUBST_LIST. TREE_PURPOSE is the type of the
7435 variant and TREE_VALUE is a TREE_VEC containing the field, the new value
7436 of the qualifier and NULL_TREE respectively. GNU_LIST is a pre-existing
7437 list to be chained to the newly created entries. */
7440 build_variant_list (tree qual_union_type, tree subst_list, tree gnu_list)
7444 for (gnu_field = TYPE_FIELDS (qual_union_type);
7446 gnu_field = TREE_CHAIN (gnu_field))
7448 tree t, qual = DECL_QUALIFIER (gnu_field);
7450 for (t = subst_list; t; t = TREE_CHAIN (t))
7451 qual = SUBSTITUTE_IN_EXPR (qual, TREE_PURPOSE (t), TREE_VALUE (t));
7453 /* If the new qualifier is not unconditionally false, its variant may
7454 still be accessed. */
7455 if (!integer_zerop (qual))
7457 tree variant_type = TREE_TYPE (gnu_field), variant_subpart;
7458 tree v = make_tree_vec (3);
7459 TREE_VEC_ELT (v, 0) = gnu_field;
7460 TREE_VEC_ELT (v, 1) = qual;
7461 TREE_VEC_ELT (v, 2) = NULL_TREE;
7462 gnu_list = tree_cons (variant_type, v, gnu_list);
7464 /* Recurse on the variant subpart of the variant, if any. */
7465 variant_subpart = get_variant_part (variant_type);
7466 if (variant_subpart)
7467 gnu_list = build_variant_list (TREE_TYPE (variant_subpart),
7468 subst_list, gnu_list);
7470 /* If the new qualifier is unconditionally true, the subsequent
7471 variants cannot be accessed. */
7472 if (integer_onep (qual))
7480 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7481 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7482 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7483 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7484 for the size of a field. COMPONENT_P is true if we are being called
7485 to process the Component_Size of GNAT_OBJECT. This is used for error
7486 message handling and to indicate to use the object size of GNU_TYPE.
7487 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7488 it means that a size of zero should be treated as an unspecified size. */
7491 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7492 enum tree_code kind, bool component_p, bool zero_ok)
7494 Node_Id gnat_error_node;
7495 tree type_size, size;
7497 if (kind == VAR_DECL
7498 /* If a type needs strict alignment, a component of this type in
7499 a packed record cannot be packed and thus uses the type size. */
7500 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7501 type_size = TYPE_SIZE (gnu_type);
7503 type_size = rm_size (gnu_type);
7505 /* Find the node to use for errors. */
7506 if ((Ekind (gnat_object) == E_Component
7507 || Ekind (gnat_object) == E_Discriminant)
7508 && Present (Component_Clause (gnat_object)))
7509 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7510 else if (Present (Size_Clause (gnat_object)))
7511 gnat_error_node = Expression (Size_Clause (gnat_object));
7513 gnat_error_node = gnat_object;
7515 /* Return 0 if no size was specified, either because Esize was not Present
7516 or the specified size was zero. */
7517 if (No (uint_size) || uint_size == No_Uint)
7520 /* Get the size as a tree. Issue an error if a size was specified but
7521 cannot be represented in sizetype. */
7522 size = UI_To_gnu (uint_size, bitsizetype);
7523 if (TREE_OVERFLOW (size))
7525 post_error_ne (component_p ? "component size of & is too large"
7526 : "size of & is too large",
7527 gnat_error_node, gnat_object);
7531 /* Ignore a negative size since that corresponds to our back-annotation.
7532 Also ignore a zero size if it is not permitted. */
7533 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7536 /* The size of objects is always a multiple of a byte. */
7537 if (kind == VAR_DECL
7538 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7541 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7542 gnat_error_node, gnat_object);
7544 post_error_ne ("size for& is not a multiple of Storage_Unit",
7545 gnat_error_node, gnat_object);
7549 /* If this is an integral type or a packed array type, the front-end has
7550 verified the size, so we need not do it here (which would entail
7551 checking against the bounds). However, if this is an aliased object,
7552 it may not be smaller than the type of the object. */
7553 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7554 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7557 /* If the object is a record that contains a template, add the size of
7558 the template to the specified size. */
7559 if (TREE_CODE (gnu_type) == RECORD_TYPE
7560 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7561 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7563 /* Modify the size of the type to be that of the maximum size if it has a
7565 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7566 type_size = max_size (type_size, true);
7568 /* If this is an access type or a fat pointer, the minimum size is that given
7569 by the smallest integral mode that's valid for pointers. */
7570 if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type))
7572 enum machine_mode p_mode;
7574 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7575 !targetm.valid_pointer_mode (p_mode);
7576 p_mode = GET_MODE_WIDER_MODE (p_mode))
7579 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7582 /* If the size of the object is a constant, the new size must not be
7584 if (TREE_CODE (type_size) != INTEGER_CST
7585 || TREE_OVERFLOW (type_size)
7586 || tree_int_cst_lt (size, type_size))
7590 ("component size for& too small{, minimum allowed is ^}",
7591 gnat_error_node, gnat_object, type_size);
7593 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7594 gnat_error_node, gnat_object, type_size);
7596 if (kind == VAR_DECL && !component_p
7597 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7598 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7599 post_error_ne_tree_2
7600 ("\\size of ^ is not a multiple of alignment (^ bits)",
7601 gnat_error_node, gnat_object, rm_size (gnu_type),
7602 TYPE_ALIGN (gnu_type));
7604 else if (INTEGRAL_TYPE_P (gnu_type))
7605 post_error_ne ("\\size would be legal if & were not aliased!",
7606 gnat_error_node, gnat_object);
7614 /* Similarly, but both validate and process a value of RM size. This
7615 routine is only called for types. */
7618 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7620 /* Only issue an error if a Value_Size clause was explicitly given.
7621 Otherwise, we'd be duplicating an error on the Size clause. */
7622 Node_Id gnat_attr_node
7623 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7624 tree old_size = rm_size (gnu_type), size;
7626 /* Do nothing if no size was specified, either because RM size was not
7627 Present or if the specified size was zero. */
7628 if (No (uint_size) || uint_size == No_Uint)
7631 /* Get the size as a tree. Issue an error if a size was specified but
7632 cannot be represented in sizetype. */
7633 size = UI_To_gnu (uint_size, bitsizetype);
7634 if (TREE_OVERFLOW (size))
7636 if (Present (gnat_attr_node))
7637 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7642 /* Ignore a negative size since that corresponds to our back-annotation.
7643 Also ignore a zero size unless a Value_Size clause exists, or a size
7644 clause exists, or this is an integer type, in which case the front-end
7645 will have always set it. */
7646 if (tree_int_cst_sgn (size) < 0
7647 || (integer_zerop (size)
7648 && No (gnat_attr_node)
7649 && !Has_Size_Clause (gnat_entity)
7650 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7653 /* If the old size is self-referential, get the maximum size. */
7654 if (CONTAINS_PLACEHOLDER_P (old_size))
7655 old_size = max_size (old_size, true);
7657 /* If the size of the object is a constant, the new size must not be smaller
7658 (the front-end has verified this for scalar and packed array types). */
7659 if (TREE_CODE (old_size) != INTEGER_CST
7660 || TREE_OVERFLOW (old_size)
7661 || (AGGREGATE_TYPE_P (gnu_type)
7662 && !(TREE_CODE (gnu_type) == ARRAY_TYPE
7663 && TYPE_PACKED_ARRAY_TYPE_P (gnu_type))
7664 && !(TYPE_IS_PADDING_P (gnu_type)
7665 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE
7666 && TYPE_PACKED_ARRAY_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_type))))
7667 && tree_int_cst_lt (size, old_size)))
7669 if (Present (gnat_attr_node))
7671 ("Value_Size for& too small{, minimum allowed is ^}",
7672 gnat_attr_node, gnat_entity, old_size);
7676 /* Otherwise, set the RM size proper for integral types... */
7677 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7678 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7679 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7680 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7681 SET_TYPE_RM_SIZE (gnu_type, size);
7683 /* ...or the Ada size for record and union types. */
7684 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7685 || TREE_CODE (gnu_type) == UNION_TYPE
7686 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7687 && !TYPE_FAT_POINTER_P (gnu_type))
7688 SET_TYPE_ADA_SIZE (gnu_type, size);
7691 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7692 If TYPE is the best type, return it. Otherwise, make a new type. We
7693 only support new integral and pointer types. FOR_BIASED is true if
7694 we are making a biased type. */
7697 make_type_from_size (tree type, tree size_tree, bool for_biased)
7699 unsigned HOST_WIDE_INT size;
7703 /* If size indicates an error, just return TYPE to avoid propagating
7704 the error. Likewise if it's too large to represent. */
7705 if (!size_tree || !host_integerp (size_tree, 1))
7708 size = tree_low_cst (size_tree, 1);
7710 switch (TREE_CODE (type))
7715 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7716 && TYPE_BIASED_REPRESENTATION_P (type));
7718 /* Integer types with precision 0 are forbidden. */
7722 /* Only do something if the type is not a packed array type and
7723 doesn't already have the proper size. */
7724 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7725 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7728 biased_p |= for_biased;
7729 if (size > LONG_LONG_TYPE_SIZE)
7730 size = LONG_LONG_TYPE_SIZE;
7732 if (TYPE_UNSIGNED (type) || biased_p)
7733 new_type = make_unsigned_type (size);
7735 new_type = make_signed_type (size);
7736 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7737 SET_TYPE_RM_MIN_VALUE (new_type,
7738 convert (TREE_TYPE (new_type),
7739 TYPE_MIN_VALUE (type)));
7740 SET_TYPE_RM_MAX_VALUE (new_type,
7741 convert (TREE_TYPE (new_type),
7742 TYPE_MAX_VALUE (type)));
7743 /* Propagate the name to avoid creating a fake subrange type. */
7744 if (TYPE_NAME (type))
7746 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7747 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7749 TYPE_NAME (new_type) = TYPE_NAME (type);
7751 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7752 SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
7756 /* Do something if this is a fat pointer, in which case we
7757 may need to return the thin pointer. */
7758 if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7760 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7761 if (!targetm.valid_pointer_mode (p_mode))
7764 build_pointer_type_for_mode
7765 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7771 /* Only do something if this is a thin pointer, in which case we
7772 may need to return the fat pointer. */
7773 if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7775 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7785 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7786 a type or object whose present alignment is ALIGN. If this alignment is
7787 valid, return it. Otherwise, give an error and return ALIGN. */
7790 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7792 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7793 unsigned int new_align;
7794 Node_Id gnat_error_node;
7796 /* Don't worry about checking alignment if alignment was not specified
7797 by the source program and we already posted an error for this entity. */
7798 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7801 /* Post the error on the alignment clause if any. Note, for the implicit
7802 base type of an array type, the alignment clause is on the first
7804 if (Present (Alignment_Clause (gnat_entity)))
7805 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7807 else if (Is_Itype (gnat_entity)
7808 && Is_Array_Type (gnat_entity)
7809 && Etype (gnat_entity) == gnat_entity
7810 && Present (Alignment_Clause (First_Subtype (gnat_entity))))
7812 Expression (Alignment_Clause (First_Subtype (gnat_entity)));
7815 gnat_error_node = gnat_entity;
7817 /* Within GCC, an alignment is an integer, so we must make sure a value is
7818 specified that fits in that range. Also, there is an upper bound to
7819 alignments we can support/allow. */
7820 if (!UI_Is_In_Int_Range (alignment)
7821 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7822 post_error_ne_num ("largest supported alignment for& is ^",
7823 gnat_error_node, gnat_entity, max_allowed_alignment);
7824 else if (!(Present (Alignment_Clause (gnat_entity))
7825 && From_At_Mod (Alignment_Clause (gnat_entity)))
7826 && new_align * BITS_PER_UNIT < align)
7828 unsigned int double_align;
7829 bool is_capped_double, align_clause;
7831 /* If the default alignment of "double" or larger scalar types is
7832 specifically capped and the new alignment is above the cap, do
7833 not post an error and change the alignment only if there is an
7834 alignment clause; this makes it possible to have the associated
7835 GCC type overaligned by default for performance reasons. */
7836 if ((double_align = double_float_alignment) > 0)
7839 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7841 = is_double_float_or_array (gnat_type, &align_clause);
7843 else if ((double_align = double_scalar_alignment) > 0)
7846 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7848 = is_double_scalar_or_array (gnat_type, &align_clause);
7851 is_capped_double = align_clause = false;
7853 if (is_capped_double && new_align >= double_align)
7856 align = new_align * BITS_PER_UNIT;
7860 if (is_capped_double)
7861 align = double_align * BITS_PER_UNIT;
7863 post_error_ne_num ("alignment for& must be at least ^",
7864 gnat_error_node, gnat_entity,
7865 align / BITS_PER_UNIT);
7870 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7871 if (new_align > align)
7878 /* Return the smallest alignment not less than SIZE. */
7881 ceil_alignment (unsigned HOST_WIDE_INT size)
7883 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7886 /* Verify that OBJECT, a type or decl, is something we can implement
7887 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7888 if we require atomic components. */
7891 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7893 Node_Id gnat_error_point = gnat_entity;
7895 enum machine_mode mode;
7899 /* There are three case of what OBJECT can be. It can be a type, in which
7900 case we take the size, alignment and mode from the type. It can be a
7901 declaration that was indirect, in which case the relevant values are
7902 that of the type being pointed to, or it can be a normal declaration,
7903 in which case the values are of the decl. The code below assumes that
7904 OBJECT is either a type or a decl. */
7905 if (TYPE_P (object))
7907 /* If this is an anonymous base type, nothing to check. Error will be
7908 reported on the source type. */
7909 if (!Comes_From_Source (gnat_entity))
7912 mode = TYPE_MODE (object);
7913 align = TYPE_ALIGN (object);
7914 size = TYPE_SIZE (object);
7916 else if (DECL_BY_REF_P (object))
7918 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7919 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7920 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7924 mode = DECL_MODE (object);
7925 align = DECL_ALIGN (object);
7926 size = DECL_SIZE (object);
7929 /* Consider all floating-point types atomic and any types that that are
7930 represented by integers no wider than a machine word. */
7931 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7932 || ((GET_MODE_CLASS (mode) == MODE_INT
7933 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7934 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7937 /* For the moment, also allow anything that has an alignment equal
7938 to its size and which is smaller than a word. */
7939 if (size && TREE_CODE (size) == INTEGER_CST
7940 && compare_tree_int (size, align) == 0
7941 && align <= BITS_PER_WORD)
7944 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7945 gnat_node = Next_Rep_Item (gnat_node))
7947 if (!comp_p && Nkind (gnat_node) == N_Pragma
7948 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7950 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7951 else if (comp_p && Nkind (gnat_node) == N_Pragma
7952 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7953 == Pragma_Atomic_Components))
7954 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7958 post_error_ne ("atomic access to component of & cannot be guaranteed",
7959 gnat_error_point, gnat_entity);
7961 post_error_ne ("atomic access to & cannot be guaranteed",
7962 gnat_error_point, gnat_entity);
7965 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7966 have compatible signatures so that a call using one type may be safely
7967 issued if the actual target function type is the other. Return 1 if it is
7968 the case, 0 otherwise, and post errors on the incompatibilities.
7970 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7971 that calls to the subprogram will have arguments suitable for the later
7972 underlying builtin expansion. */
7975 compatible_signatures_p (tree ftype1, tree ftype2)
7977 /* As of now, we only perform very trivial tests and consider it's the
7978 programmer's responsibility to ensure the type correctness in the Ada
7979 declaration, as in the regular Import cases.
7981 Mismatches typically result in either error messages from the builtin
7982 expander, internal compiler errors, or in a real call sequence. This
7983 should be refined to issue diagnostics helping error detection and
7986 /* Almost fake test, ensuring a use of each argument. */
7987 if (ftype1 == ftype2)
7993 /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type
7994 and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the
7995 specified size for this field. POS_LIST is a position list describing
7996 the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied
8000 create_field_decl_from (tree old_field, tree field_type, tree record_type,
8001 tree size, tree pos_list, tree subst_list)
8003 tree t = TREE_VALUE (purpose_member (old_field, pos_list));
8004 tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2);
8005 unsigned int offset_align = tree_low_cst (TREE_VEC_ELT (t, 1), 1);
8006 tree new_pos, new_field;
8008 if (CONTAINS_PLACEHOLDER_P (pos))
8009 for (t = subst_list; t; t = TREE_CHAIN (t))
8010 pos = SUBSTITUTE_IN_EXPR (pos, TREE_PURPOSE (t), TREE_VALUE (t));
8012 /* If the position is now a constant, we can set it as the position of the
8013 field when we make it. Otherwise, we need to deal with it specially. */
8014 if (TREE_CONSTANT (pos))
8015 new_pos = bit_from_pos (pos, bitpos);
8017 new_pos = NULL_TREE;
8020 = create_field_decl (DECL_NAME (old_field), field_type, record_type,
8021 DECL_PACKED (old_field), size, new_pos,
8022 !DECL_NONADDRESSABLE_P (old_field));
8026 normalize_offset (&pos, &bitpos, offset_align);
8027 DECL_FIELD_OFFSET (new_field) = pos;
8028 DECL_FIELD_BIT_OFFSET (new_field) = bitpos;
8029 SET_DECL_OFFSET_ALIGN (new_field, offset_align);
8030 DECL_SIZE (new_field) = size;
8031 DECL_SIZE_UNIT (new_field)
8032 = convert (sizetype,
8033 size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node));
8034 layout_decl (new_field, DECL_OFFSET_ALIGN (new_field));
8037 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
8038 t = DECL_ORIGINAL_FIELD (old_field);
8039 SET_DECL_ORIGINAL_FIELD (new_field, t ? t : old_field);
8040 DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field);
8041 TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field);
8046 /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */
8049 get_rep_part (tree record_type)
8051 tree field = TYPE_FIELDS (record_type);
8053 /* The REP part is the first field, internal, another record, and its name
8054 doesn't start with an underscore (i.e. is not generated by the FE). */
8055 if (DECL_INTERNAL_P (field)
8056 && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
8057 && IDENTIFIER_POINTER (DECL_NAME (field)) [0] != '_')
8063 /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */
8066 get_variant_part (tree record_type)
8070 /* The variant part is the only internal field that is a qualified union. */
8071 for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
8072 if (DECL_INTERNAL_P (field)
8073 && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE)
8079 /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is
8080 the list of variants to be used and RECORD_TYPE is the type of the parent.
8081 POS_LIST is a position list describing the layout of fields present in
8082 OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this
8086 create_variant_part_from (tree old_variant_part, tree variant_list,
8087 tree record_type, tree pos_list, tree subst_list)
8089 tree offset = DECL_FIELD_OFFSET (old_variant_part);
8090 tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part);
8091 tree old_union_type = TREE_TYPE (old_variant_part);
8092 tree new_union_type, new_variant_part, t;
8093 tree union_field_list = NULL_TREE;
8095 /* First create the type of the variant part from that of the old one. */
8096 new_union_type = make_node (QUAL_UNION_TYPE);
8097 TYPE_NAME (new_union_type) = DECL_NAME (TYPE_NAME (old_union_type));
8099 /* If the position of the variant part is constant, subtract it from the
8100 size of the type of the parent to get the new size. This manual CSE
8101 reduces the code size when not optimizing. */
8102 if (TREE_CODE (offset) == INTEGER_CST && TREE_CODE (bitpos) == INTEGER_CST)
8104 tree first_bit = bit_from_pos (offset, bitpos);
8105 TYPE_SIZE (new_union_type)
8106 = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit);
8107 TYPE_SIZE_UNIT (new_union_type)
8108 = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type),
8109 byte_from_pos (offset, bitpos));
8110 SET_TYPE_ADA_SIZE (new_union_type,
8111 size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type),
8113 TYPE_ALIGN (new_union_type) = TYPE_ALIGN (old_union_type);
8114 relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY);
8117 copy_and_substitute_in_size (new_union_type, old_union_type, subst_list);
8119 /* Now finish up the new variants and populate the union type. */
8120 for (t = variant_list; t; t = TREE_CHAIN (t))
8122 tree old_field = TREE_VEC_ELT (TREE_VALUE (t), 0), new_field;
8123 tree old_variant, old_variant_subpart, new_variant, field_list;
8125 /* Skip variants that don't belong to this nesting level. */
8126 if (DECL_CONTEXT (old_field) != old_union_type)
8129 /* Retrieve the list of fields already added to the new variant. */
8130 new_variant = TREE_VEC_ELT (TREE_VALUE (t), 2);
8131 field_list = TYPE_FIELDS (new_variant);
8133 /* If the old variant had a variant subpart, we need to create a new
8134 variant subpart and add it to the field list. */
8135 old_variant = TREE_PURPOSE (t);
8136 old_variant_subpart = get_variant_part (old_variant);
8137 if (old_variant_subpart)
8139 tree new_variant_subpart
8140 = create_variant_part_from (old_variant_subpart, variant_list,
8141 new_variant, pos_list, subst_list);
8142 TREE_CHAIN (new_variant_subpart) = field_list;
8143 field_list = new_variant_subpart;
8146 /* Finish up the new variant and create the field. No need for debug
8147 info thanks to the XVS type. */
8148 finish_record_type (new_variant, nreverse (field_list), 2, false);
8149 compute_record_mode (new_variant);
8150 create_type_decl (TYPE_NAME (new_variant), new_variant, NULL,
8151 true, false, Empty);
8154 = create_field_decl_from (old_field, new_variant, new_union_type,
8155 TYPE_SIZE (new_variant),
8156 pos_list, subst_list);
8157 DECL_QUALIFIER (new_field) = TREE_VEC_ELT (TREE_VALUE (t), 1);
8158 DECL_INTERNAL_P (new_field) = 1;
8159 TREE_CHAIN (new_field) = union_field_list;
8160 union_field_list = new_field;
8163 /* Finish up the union type and create the variant part. No need for debug
8164 info thanks to the XVS type. */
8165 finish_record_type (new_union_type, union_field_list, 2, false);
8166 compute_record_mode (new_union_type);
8167 create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL,
8168 true, false, Empty);
8171 = create_field_decl_from (old_variant_part, new_union_type, record_type,
8172 TYPE_SIZE (new_union_type),
8173 pos_list, subst_list);
8174 DECL_INTERNAL_P (new_variant_part) = 1;
8176 /* With multiple discriminants it is possible for an inner variant to be
8177 statically selected while outer ones are not; in this case, the list
8178 of fields of the inner variant is not flattened and we end up with a
8179 qualified union with a single member. Drop the useless container. */
8180 if (!TREE_CHAIN (union_field_list))
8182 DECL_CONTEXT (union_field_list) = record_type;
8183 DECL_FIELD_OFFSET (union_field_list)
8184 = DECL_FIELD_OFFSET (new_variant_part);
8185 DECL_FIELD_BIT_OFFSET (union_field_list)
8186 = DECL_FIELD_BIT_OFFSET (new_variant_part);
8187 SET_DECL_OFFSET_ALIGN (union_field_list,
8188 DECL_OFFSET_ALIGN (new_variant_part));
8189 new_variant_part = union_field_list;
8192 return new_variant_part;
8195 /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE,
8196 which are both RECORD_TYPE, after applying the substitutions described
8200 copy_and_substitute_in_size (tree new_type, tree old_type, tree subst_list)
8204 TYPE_SIZE (new_type) = TYPE_SIZE (old_type);
8205 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type);
8206 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type));
8207 TYPE_ALIGN (new_type) = TYPE_ALIGN (old_type);
8208 relate_alias_sets (new_type, old_type, ALIAS_SET_COPY);
8210 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type)))
8211 for (t = subst_list; t; t = TREE_CHAIN (t))
8212 TYPE_SIZE (new_type)
8213 = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type),
8217 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type)))
8218 for (t = subst_list; t; t = TREE_CHAIN (t))
8219 TYPE_SIZE_UNIT (new_type)
8220 = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type),
8224 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type)))
8225 for (t = subst_list; t; t = TREE_CHAIN (t))
8227 (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type),
8231 /* Finalize the size. */
8232 TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type));
8233 TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type));
8236 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
8237 type with all size expressions that contain F in a PLACEHOLDER_EXPR
8238 updated by replacing F with R.
8240 The function doesn't update the layout of the type, i.e. it assumes
8241 that the substitution is purely formal. That's why the replacement
8242 value R must itself contain a PLACEHOLDER_EXPR. */
8245 substitute_in_type (tree t, tree f, tree r)
8249 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
8251 switch (TREE_CODE (t))
8258 /* First the domain types of arrays. */
8259 if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t))
8260 || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t)))
8262 tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r);
8263 tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r);
8265 if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t))
8269 TYPE_GCC_MIN_VALUE (nt) = low;
8270 TYPE_GCC_MAX_VALUE (nt) = high;
8272 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t))
8274 (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
8279 /* Then the subtypes. */
8280 if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t))
8281 || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t)))
8283 tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r);
8284 tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r);
8286 if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t))
8290 SET_TYPE_RM_MIN_VALUE (nt, low);
8291 SET_TYPE_RM_MAX_VALUE (nt, high);
8299 nt = substitute_in_type (TREE_TYPE (t), f, r);
8300 if (nt == TREE_TYPE (t))
8303 return build_complex_type (nt);
8309 /* These should never show up here. */
8314 tree component = substitute_in_type (TREE_TYPE (t), f, r);
8315 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
8317 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
8320 nt = build_array_type (component, domain);
8321 TYPE_ALIGN (nt) = TYPE_ALIGN (t);
8322 TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t);
8323 SET_TYPE_MODE (nt, TYPE_MODE (t));
8324 TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
8325 TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
8326 TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t);
8327 TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t);
8328 TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t);
8334 case QUAL_UNION_TYPE:
8336 bool changed_field = false;
8339 /* Start out with no fields, make new fields, and chain them
8340 in. If we haven't actually changed the type of any field,
8341 discard everything we've done and return the old type. */
8343 TYPE_FIELDS (nt) = NULL_TREE;
8345 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
8347 tree new_field = copy_node (field), new_n;
8349 new_n = substitute_in_type (TREE_TYPE (field), f, r);
8350 if (new_n != TREE_TYPE (field))
8352 TREE_TYPE (new_field) = new_n;
8353 changed_field = true;
8356 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
8357 if (new_n != DECL_FIELD_OFFSET (field))
8359 DECL_FIELD_OFFSET (new_field) = new_n;
8360 changed_field = true;
8363 /* Do the substitution inside the qualifier, if any. */
8364 if (TREE_CODE (t) == QUAL_UNION_TYPE)
8366 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
8367 if (new_n != DECL_QUALIFIER (field))
8369 DECL_QUALIFIER (new_field) = new_n;
8370 changed_field = true;
8374 DECL_CONTEXT (new_field) = nt;
8375 SET_DECL_ORIGINAL_FIELD (new_field,
8376 (DECL_ORIGINAL_FIELD (field)
8377 ? DECL_ORIGINAL_FIELD (field) : field));
8379 TREE_CHAIN (new_field) = TYPE_FIELDS (nt);
8380 TYPE_FIELDS (nt) = new_field;
8386 TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt));
8387 TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
8388 TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
8389 SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
8398 /* Return the RM size of GNU_TYPE. This is the actual number of bits
8399 needed to represent the object. */
8402 rm_size (tree gnu_type)
8404 /* For integral types, we store the RM size explicitly. */
8405 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
8406 return TYPE_RM_SIZE (gnu_type);
8408 /* Return the RM size of the actual data plus the size of the template. */
8409 if (TREE_CODE (gnu_type) == RECORD_TYPE
8410 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
8412 size_binop (PLUS_EXPR,
8413 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
8414 DECL_SIZE (TYPE_FIELDS (gnu_type)));
8416 /* For record types, we store the size explicitly. */
8417 if ((TREE_CODE (gnu_type) == RECORD_TYPE
8418 || TREE_CODE (gnu_type) == UNION_TYPE
8419 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
8420 && !TYPE_FAT_POINTER_P (gnu_type)
8421 && TYPE_ADA_SIZE (gnu_type))
8422 return TYPE_ADA_SIZE (gnu_type);
8424 /* For other types, this is just the size. */
8425 return TYPE_SIZE (gnu_type);
8428 /* Return the name to be used for GNAT_ENTITY. If a type, create a
8429 fully-qualified name, possibly with type information encoding.
8430 Otherwise, return the name. */
8433 get_entity_name (Entity_Id gnat_entity)
8435 Get_Encoded_Name (gnat_entity);
8436 return get_identifier_with_length (Name_Buffer, Name_Len);
8439 /* Return an identifier representing the external name to be used for
8440 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
8441 and the specified suffix. */
8444 create_concat_name (Entity_Id gnat_entity, const char *suffix)
8446 Entity_Kind kind = Ekind (gnat_entity);
8450 String_Template temp = {1, strlen (suffix)};
8451 Fat_Pointer fp = {suffix, &temp};
8452 Get_External_Name_With_Suffix (gnat_entity, fp);
8455 Get_External_Name (gnat_entity, 0);
8457 /* A variable using the Stdcall convention lives in a DLL. We adjust
8458 its name to use the jump table, the _imp__NAME contains the address
8459 for the NAME variable. */
8460 if ((kind == E_Variable || kind == E_Constant)
8461 && Has_Stdcall_Convention (gnat_entity))
8463 const int len = 6 + Name_Len;
8464 char *new_name = (char *) alloca (len + 1);
8465 strcpy (new_name, "_imp__");
8466 strcat (new_name, Name_Buffer);
8467 return get_identifier_with_length (new_name, len);
8470 return get_identifier_with_length (Name_Buffer, Name_Len);
8473 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
8474 string, return a new IDENTIFIER_NODE that is the concatenation of
8475 the name followed by "___" and the specified suffix. */
8478 concat_name (tree gnu_name, const char *suffix)
8480 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
8481 char *new_name = (char *) alloca (len + 1);
8482 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
8483 strcat (new_name, "___");
8484 strcat (new_name, suffix);
8485 return get_identifier_with_length (new_name, len);
8488 #include "gt-ada-decl.h"
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