1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2009, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License along with GCC; see the file COPYING3. If not see *
19 * <http://www.gnu.org/licenses/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
28 #include "coretypes.h"
53 #ifndef MAX_FIXED_MODE_SIZE
54 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
57 /* Convention_Stdcall should be processed in a specific way on Windows targets
58 only. The macro below is a helper to avoid having to check for a Windows
59 specific attribute throughout this unit. */
61 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
62 #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall)
64 #define Has_Stdcall_Convention(E) (0)
67 /* Stack realignment for functions with foreign conventions is provided on a
68 per back-end basis now, as it is handled by the prologue expanders and not
69 as part of the function's body any more. It might be requested by way of a
70 dedicated function type attribute on the targets that support it.
72 We need a way to avoid setting the attribute on the targets that don't
73 support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose.
75 It is defined on targets where the circuitry is available, and indicates
76 whether the realignment is needed for 'main'. We use this to decide for
77 foreign subprograms as well.
79 It is not defined on targets where the circuitry is not implemented, and
80 we just never set the attribute in these cases.
82 Whether it is defined on all targets that would need it in theory is
83 not entirely clear. We currently trust the base GCC settings for this
86 #ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
87 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 0
92 struct incomplete *next;
97 /* These variables are used to defer recursively expanding incomplete types
98 while we are processing an array, a record or a subprogram type. */
99 static int defer_incomplete_level = 0;
100 static struct incomplete *defer_incomplete_list;
102 /* This variable is used to delay expanding From_With_Type types until the
104 static struct incomplete *defer_limited_with;
106 /* These variables are used to defer finalizing types. The element of the
107 list is the TYPE_DECL associated with the type. */
108 static int defer_finalize_level = 0;
109 static VEC (tree,heap) *defer_finalize_list;
111 /* A hash table used to cache the result of annotate_value. */
112 static GTY ((if_marked ("tree_int_map_marked_p"),
113 param_is (struct tree_int_map))) htab_t annotate_value_cache;
122 static void relate_alias_sets (tree, tree, enum alias_set_op);
124 static tree build_subst_list (Entity_Id, Entity_Id, bool);
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_field (Entity_Id, tree, int, bool);
134 static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool,
136 static bool same_discriminant_p (Entity_Id, Entity_Id);
137 static bool array_type_has_nonaliased_component (Entity_Id, tree);
138 static bool compile_time_known_address_p (Node_Id);
139 static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
140 bool, bool, bool, bool);
141 static Uint annotate_value (tree);
142 static void annotate_rep (Entity_Id, tree);
143 static tree compute_field_positions (tree, tree, tree, tree, unsigned int);
144 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
145 static void set_rm_size (Uint, tree, Entity_Id);
146 static tree make_type_from_size (tree, tree, bool);
147 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
148 static unsigned int ceil_alignment (unsigned HOST_WIDE_INT);
149 static void check_ok_for_atomic (tree, Entity_Id, bool);
150 static int compatible_signatures_p (tree ftype1, tree ftype2);
151 static void rest_of_type_decl_compilation_no_defer (tree);
153 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
154 entity, return the equivalent GCC tree for that entity (a ..._DECL node)
155 and associate the ..._DECL node with the input GNAT defining identifier.
157 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
158 initial value (in GCC tree form). This is optional for a variable. For
159 a renamed entity, GNU_EXPR gives the object being renamed.
161 DEFINITION is nonzero if this call is intended for a definition. This is
162 used for separate compilation where it is necessary to know whether an
163 external declaration or a definition must be created if the GCC equivalent
164 was not created previously. The value of 1 is normally used for a nonzero
165 DEFINITION, but a value of 2 is used in special circumstances, defined in
169 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
171 /* Contains the kind of the input GNAT node. */
172 const Entity_Kind kind = Ekind (gnat_entity);
173 /* True if this is a type. */
174 const bool is_type = IN (kind, Type_Kind);
175 /* For a type, contains the equivalent GNAT node to be used in gigi. */
176 Entity_Id gnat_equiv_type = Empty;
177 /* Temporary used to walk the GNAT tree. */
179 /* Contains the GCC DECL node which is equivalent to the input GNAT node.
180 This node will be associated with the GNAT node by calling at the end
181 of the `switch' statement. */
182 tree gnu_decl = NULL_TREE;
183 /* Contains the GCC type to be used for the GCC node. */
184 tree gnu_type = NULL_TREE;
185 /* Contains the GCC size tree to be used for the GCC node. */
186 tree gnu_size = NULL_TREE;
187 /* Contains the GCC name to be used for the GCC node. */
188 tree gnu_entity_name;
189 /* True if we have already saved gnu_decl as a GNAT association. */
191 /* True if we incremented defer_incomplete_level. */
192 bool this_deferred = false;
193 /* True if we incremented force_global. */
194 bool this_global = false;
195 /* True if we should check to see if elaborated during processing. */
196 bool maybe_present = false;
197 /* True if we made GNU_DECL and its type here. */
198 bool this_made_decl = false;
199 /* True if debug info is requested for this entity. */
200 bool debug_info_p = (Needs_Debug_Info (gnat_entity)
201 || debug_info_level == DINFO_LEVEL_VERBOSE);
202 /* True if this entity is to be considered as imported. */
203 bool imported_p = (Is_Imported (gnat_entity)
204 && No (Address_Clause (gnat_entity)));
205 /* Size and alignment of the GCC node, if meaningful. */
206 unsigned int esize = 0, align = 0;
207 /* Contains the list of attributes directly attached to the entity. */
208 struct attrib *attr_list = NULL;
210 /* Since a use of an Itype is a definition, process it as such if it
211 is not in a with'ed unit. */
214 && Is_Itype (gnat_entity)
215 && !present_gnu_tree (gnat_entity)
216 && In_Extended_Main_Code_Unit (gnat_entity))
218 /* Ensure that we are in a subprogram mentioned in the Scope chain of
219 this entity, our current scope is global, or we encountered a task
220 or entry (where we can't currently accurately check scoping). */
221 if (!current_function_decl
222 || DECL_ELABORATION_PROC_P (current_function_decl))
224 process_type (gnat_entity);
225 return get_gnu_tree (gnat_entity);
228 for (gnat_temp = Scope (gnat_entity);
230 gnat_temp = Scope (gnat_temp))
232 if (Is_Type (gnat_temp))
233 gnat_temp = Underlying_Type (gnat_temp);
235 if (Ekind (gnat_temp) == E_Subprogram_Body)
237 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
239 if (IN (Ekind (gnat_temp), Subprogram_Kind)
240 && Present (Protected_Body_Subprogram (gnat_temp)))
241 gnat_temp = Protected_Body_Subprogram (gnat_temp);
243 if (Ekind (gnat_temp) == E_Entry
244 || Ekind (gnat_temp) == E_Entry_Family
245 || Ekind (gnat_temp) == E_Task_Type
246 || (IN (Ekind (gnat_temp), Subprogram_Kind)
247 && present_gnu_tree (gnat_temp)
248 && (current_function_decl
249 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
251 process_type (gnat_entity);
252 return get_gnu_tree (gnat_entity);
256 /* This abort means the Itype has an incorrect scope, i.e. that its
257 scope does not correspond to the subprogram it is declared in. */
261 /* If we've already processed this entity, return what we got last time.
262 If we are defining the node, we should not have already processed it.
263 In that case, we will abort below when we try to save a new GCC tree
264 for this object. We also need to handle the case of getting a dummy
265 type when a Full_View exists. */
266 if ((!definition || (is_type && imported_p))
267 && present_gnu_tree (gnat_entity))
269 gnu_decl = get_gnu_tree (gnat_entity);
271 if (TREE_CODE (gnu_decl) == TYPE_DECL
272 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
273 && IN (kind, Incomplete_Or_Private_Kind)
274 && Present (Full_View (gnat_entity)))
277 = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0);
278 save_gnu_tree (gnat_entity, NULL_TREE, false);
279 save_gnu_tree (gnat_entity, gnu_decl, false);
285 /* If this is a numeric or enumeral type, or an access type, a nonzero
286 Esize must be specified unless it was specified by the programmer. */
287 gcc_assert (!Unknown_Esize (gnat_entity)
288 || Has_Size_Clause (gnat_entity)
289 || (!IN (kind, Numeric_Kind)
290 && !IN (kind, Enumeration_Kind)
291 && (!IN (kind, Access_Kind)
292 || kind == E_Access_Protected_Subprogram_Type
293 || kind == E_Anonymous_Access_Protected_Subprogram_Type
294 || kind == E_Access_Subtype)));
296 /* The RM size must be specified for all discrete and fixed-point types. */
297 gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind)
298 && Unknown_RM_Size (gnat_entity)));
300 /* If we get here, it means we have not yet done anything with this entity.
301 If we are not defining it, it must be a type or an entity that is defined
302 elsewhere or externally, otherwise we should have defined it already. */
303 gcc_assert (definition
304 || type_annotate_only
306 || kind == E_Discriminant
307 || kind == E_Component
309 || (kind == E_Constant && Present (Full_View (gnat_entity)))
310 || Is_Public (gnat_entity));
312 /* Get the name of the entity and set up the line number and filename of
313 the original definition for use in any decl we make. */
314 gnu_entity_name = get_entity_name (gnat_entity);
315 Sloc_to_locus (Sloc (gnat_entity), &input_location);
317 /* For cases when we are not defining (i.e., we are referencing from
318 another compilation unit) public entities, show we are at global level
319 for the purpose of computing scopes. Don't do this for components or
320 discriminants since the relevant test is whether or not the record is
323 && kind != E_Component
324 && kind != E_Discriminant
325 && Is_Public (gnat_entity)
326 && !Is_Statically_Allocated (gnat_entity))
327 force_global++, this_global = true;
329 /* Handle any attributes directly attached to the entity. */
330 if (Has_Gigi_Rep_Item (gnat_entity))
331 prepend_attributes (gnat_entity, &attr_list);
333 /* Do some common processing for types. */
336 /* Compute the equivalent type to be used in gigi. */
337 gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity);
339 /* Machine_Attributes on types are expected to be propagated to
340 subtypes. The corresponding Gigi_Rep_Items are only attached
341 to the first subtype though, so we handle the propagation here. */
342 if (Base_Type (gnat_entity) != gnat_entity
343 && !Is_First_Subtype (gnat_entity)
344 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
345 prepend_attributes (First_Subtype (Base_Type (gnat_entity)),
348 /* Compute a default value for the size of the type. */
349 if (Known_Esize (gnat_entity)
350 && UI_Is_In_Int_Range (Esize (gnat_entity)))
352 unsigned int max_esize;
353 esize = UI_To_Int (Esize (gnat_entity));
355 if (IN (kind, Float_Kind))
356 max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
357 else if (IN (kind, Access_Kind))
358 max_esize = POINTER_SIZE * 2;
360 max_esize = LONG_LONG_TYPE_SIZE;
362 if (esize > max_esize)
366 esize = LONG_LONG_TYPE_SIZE;
372 /* If this is a use of a deferred constant without address clause,
373 get its full definition. */
375 && No (Address_Clause (gnat_entity))
376 && Present (Full_View (gnat_entity)))
379 = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0);
384 /* If we have an external constant that we are not defining, get the
385 expression that is was defined to represent. We may throw that
386 expression away later if it is not a constant. Do not retrieve the
387 expression if it is an aggregate or allocator, because in complex
388 instantiation contexts it may not be expanded */
390 && Present (Expression (Declaration_Node (gnat_entity)))
391 && !No_Initialization (Declaration_Node (gnat_entity))
392 && (Nkind (Expression (Declaration_Node (gnat_entity)))
394 && (Nkind (Expression (Declaration_Node (gnat_entity)))
396 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
398 /* Ignore deferred constant definitions without address clause since
399 they are processed fully in the front-end. If No_Initialization
400 is set, this is not a deferred constant but a constant whose value
401 is built manually. And constants that are renamings are handled
405 && No (Address_Clause (gnat_entity))
406 && !No_Initialization (Declaration_Node (gnat_entity))
407 && No (Renamed_Object (gnat_entity)))
409 gnu_decl = error_mark_node;
414 /* Ignore constant definitions already marked with the error node. See
415 the N_Object_Declaration case of gnat_to_gnu for the rationale. */
418 && present_gnu_tree (gnat_entity)
419 && get_gnu_tree (gnat_entity) == error_mark_node)
421 maybe_present = true;
428 /* We used to special case VMS exceptions here to directly map them to
429 their associated condition code. Since this code had to be masked
430 dynamically to strip off the severity bits, this caused trouble in
431 the GCC/ZCX case because the "type" pointers we store in the tables
432 have to be static. We now don't special case here anymore, and let
433 the regular processing take place, which leaves us with a regular
434 exception data object for VMS exceptions too. The condition code
435 mapping is taken care of by the front end and the bitmasking by the
442 /* The GNAT record where the component was defined. */
443 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
445 /* If the variable is an inherited record component (in the case of
446 extended record types), just return the inherited entity, which
447 must be a FIELD_DECL. Likewise for discriminants.
448 For discriminants of untagged records which have explicit
449 stored discriminants, return the entity for the corresponding
450 stored discriminant. Also use Original_Record_Component
451 if the record has a private extension. */
452 if (Present (Original_Record_Component (gnat_entity))
453 && Original_Record_Component (gnat_entity) != gnat_entity)
456 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
457 gnu_expr, definition);
462 /* If the enclosing record has explicit stored discriminants,
463 then it is an untagged record. If the Corresponding_Discriminant
464 is not empty then this must be a renamed discriminant and its
465 Original_Record_Component must point to the corresponding explicit
466 stored discriminant (i.e. we should have taken the previous
468 else if (Present (Corresponding_Discriminant (gnat_entity))
469 && Is_Tagged_Type (gnat_record))
471 /* A tagged record has no explicit stored discriminants. */
472 gcc_assert (First_Discriminant (gnat_record)
473 == First_Stored_Discriminant (gnat_record));
475 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
476 gnu_expr, definition);
481 else if (Present (CR_Discriminant (gnat_entity))
482 && type_annotate_only)
484 gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity),
485 gnu_expr, definition);
490 /* If the enclosing record has explicit stored discriminants, then
491 it is an untagged record. If the Corresponding_Discriminant
492 is not empty then this must be a renamed discriminant and its
493 Original_Record_Component must point to the corresponding explicit
494 stored discriminant (i.e. we should have taken the first
496 else if (Present (Corresponding_Discriminant (gnat_entity))
497 && (First_Discriminant (gnat_record)
498 != First_Stored_Discriminant (gnat_record)))
501 /* Otherwise, if we are not defining this and we have no GCC type
502 for the containing record, make one for it. Then we should
503 have made our own equivalent. */
504 else if (!definition && !present_gnu_tree (gnat_record))
506 /* ??? If this is in a record whose scope is a protected
507 type and we have an Original_Record_Component, use it.
508 This is a workaround for major problems in protected type
510 Entity_Id Scop = Scope (Scope (gnat_entity));
511 if ((Is_Protected_Type (Scop)
512 || (Is_Private_Type (Scop)
513 && Present (Full_View (Scop))
514 && Is_Protected_Type (Full_View (Scop))))
515 && Present (Original_Record_Component (gnat_entity)))
518 = gnat_to_gnu_entity (Original_Record_Component
525 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
526 gnu_decl = get_gnu_tree (gnat_entity);
532 /* Here we have no GCC type and this is a reference rather than a
533 definition. This should never happen. Most likely the cause is
534 reference before declaration in the gnat tree for gnat_entity. */
538 case E_Loop_Parameter:
539 case E_Out_Parameter:
542 /* Simple variables, loop variables, Out parameters, and exceptions. */
545 bool used_by_ref = false;
547 = ((kind == E_Constant || kind == E_Variable)
548 && Is_True_Constant (gnat_entity)
549 && !Treat_As_Volatile (gnat_entity)
550 && (((Nkind (Declaration_Node (gnat_entity))
551 == N_Object_Declaration)
552 && Present (Expression (Declaration_Node (gnat_entity))))
553 || Present (Renamed_Object (gnat_entity))));
554 bool inner_const_flag = const_flag;
555 bool static_p = Is_Statically_Allocated (gnat_entity);
556 bool mutable_p = false;
557 tree gnu_ext_name = NULL_TREE;
558 tree renamed_obj = NULL_TREE;
559 tree gnu_object_size;
561 if (Present (Renamed_Object (gnat_entity)) && !definition)
563 if (kind == E_Exception)
564 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
567 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
570 /* Get the type after elaborating the renamed object. */
571 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
573 /* For a debug renaming declaration, build a pure debug entity. */
574 if (Present (Debug_Renaming_Link (gnat_entity)))
577 gnu_decl = build_decl (input_location,
578 VAR_DECL, gnu_entity_name, gnu_type);
579 /* The (MEM (CONST (0))) pattern is prescribed by STABS. */
580 if (global_bindings_p ())
581 addr = gen_rtx_CONST (VOIDmode, const0_rtx);
583 addr = stack_pointer_rtx;
584 SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
585 gnat_pushdecl (gnu_decl, gnat_entity);
589 /* If this is a loop variable, its type should be the base type.
590 This is because the code for processing a loop determines whether
591 a normal loop end test can be done by comparing the bounds of the
592 loop against those of the base type, which is presumed to be the
593 size used for computation. But this is not correct when the size
594 of the subtype is smaller than the type. */
595 if (kind == E_Loop_Parameter)
596 gnu_type = get_base_type (gnu_type);
598 /* Reject non-renamed objects whose types are unconstrained arrays or
599 any object whose type is a dummy type or VOID_TYPE. */
601 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
602 && No (Renamed_Object (gnat_entity)))
603 || TYPE_IS_DUMMY_P (gnu_type)
604 || TREE_CODE (gnu_type) == VOID_TYPE)
606 gcc_assert (type_annotate_only);
609 return error_mark_node;
612 /* If an alignment is specified, use it if valid. Note that exceptions
613 are objects but don't have an alignment. We must do this before we
614 validate the size, since the alignment can affect the size. */
615 if (kind != E_Exception && Known_Alignment (gnat_entity))
617 gcc_assert (Present (Alignment (gnat_entity)));
618 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
619 TYPE_ALIGN (gnu_type));
620 /* No point in changing the type if there is an address clause
621 as the final type of the object will be a reference type. */
622 if (Present (Address_Clause (gnat_entity)))
626 = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
627 "PAD", false, definition, true);
630 /* If we are defining the object, see if it has a Size value and
631 validate it if so. If we are not defining the object and a Size
632 clause applies, simply retrieve the value. We don't want to ignore
633 the clause and it is expected to have been validated already. Then
634 get the new type, if any. */
636 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
637 gnat_entity, VAR_DECL, false,
638 Has_Size_Clause (gnat_entity));
639 else if (Has_Size_Clause (gnat_entity))
640 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
645 = make_type_from_size (gnu_type, gnu_size,
646 Has_Biased_Representation (gnat_entity));
648 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
649 gnu_size = NULL_TREE;
652 /* If this object has self-referential size, it must be a record with
653 a default value. We are supposed to allocate an object of the
654 maximum size in this case unless it is a constant with an
655 initializing expression, in which case we can get the size from
656 that. Note that the resulting size may still be a variable, so
657 this may end up with an indirect allocation. */
658 if (No (Renamed_Object (gnat_entity))
659 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
661 if (gnu_expr && kind == E_Constant)
663 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
664 if (CONTAINS_PLACEHOLDER_P (size))
666 /* If the initializing expression is itself a constant,
667 despite having a nominal type with self-referential
668 size, we can get the size directly from it. */
669 if (TREE_CODE (gnu_expr) == COMPONENT_REF
670 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
673 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
674 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
675 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
676 || DECL_READONLY_ONCE_ELAB
677 (TREE_OPERAND (gnu_expr, 0))))
678 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
681 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
686 /* We may have no GNU_EXPR because No_Initialization is
687 set even though there's an Expression. */
688 else if (kind == E_Constant
689 && (Nkind (Declaration_Node (gnat_entity))
690 == N_Object_Declaration)
691 && Present (Expression (Declaration_Node (gnat_entity))))
693 = TYPE_SIZE (gnat_to_gnu_type
695 (Expression (Declaration_Node (gnat_entity)))));
698 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
703 /* If the size is zero bytes, make it one byte since some linkers have
704 trouble with zero-sized objects. If the object will have a
705 template, that will make it nonzero so don't bother. Also avoid
706 doing that for an object renaming or an object with an address
707 clause, as we would lose useful information on the view size
708 (e.g. for null array slices) and we are not allocating the object
711 && integer_zerop (gnu_size)
712 && !TREE_OVERFLOW (gnu_size))
713 || (TYPE_SIZE (gnu_type)
714 && integer_zerop (TYPE_SIZE (gnu_type))
715 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
716 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
717 || !Is_Array_Type (Etype (gnat_entity)))
718 && No (Renamed_Object (gnat_entity))
719 && No (Address_Clause (gnat_entity)))
720 gnu_size = bitsize_unit_node;
722 /* If this is an object with no specified size and alignment, and
723 if either it is atomic or we are not optimizing alignment for
724 space and it is composite and not an exception, an Out parameter
725 or a reference to another object, and the size of its type is a
726 constant, set the alignment to the smallest one which is not
727 smaller than the size, with an appropriate cap. */
728 if (!gnu_size && align == 0
729 && (Is_Atomic (gnat_entity)
730 || (!Optimize_Alignment_Space (gnat_entity)
731 && kind != E_Exception
732 && kind != E_Out_Parameter
733 && Is_Composite_Type (Etype (gnat_entity))
734 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
736 && No (Renamed_Object (gnat_entity))
737 && No (Address_Clause (gnat_entity))))
738 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
740 /* No point in jumping through all the hoops needed in order
741 to support BIGGEST_ALIGNMENT if we don't really have to.
742 So we cap to the smallest alignment that corresponds to
743 a known efficient memory access pattern of the target. */
744 unsigned int align_cap = Is_Atomic (gnat_entity)
746 : get_mode_alignment (ptr_mode);
748 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
749 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
752 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
754 /* But make sure not to under-align the object. */
755 if (align <= TYPE_ALIGN (gnu_type))
758 /* And honor the minimum valid atomic alignment, if any. */
759 #ifdef MINIMUM_ATOMIC_ALIGNMENT
760 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
761 align = MINIMUM_ATOMIC_ALIGNMENT;
765 /* If the object is set to have atomic components, find the component
766 type and validate it.
768 ??? Note that we ignore Has_Volatile_Components on objects; it's
769 not at all clear what to do in that case. */
771 if (Has_Atomic_Components (gnat_entity))
773 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
774 ? TREE_TYPE (gnu_type) : gnu_type);
776 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
777 && TYPE_MULTI_ARRAY_P (gnu_inner))
778 gnu_inner = TREE_TYPE (gnu_inner);
780 check_ok_for_atomic (gnu_inner, gnat_entity, true);
783 /* Now check if the type of the object allows atomic access. Note
784 that we must test the type, even if this object has size and
785 alignment to allow such access, because we will be going
786 inside the padded record to assign to the object. We could fix
787 this by always copying via an intermediate value, but it's not
788 clear it's worth the effort. */
789 if (Is_Atomic (gnat_entity))
790 check_ok_for_atomic (gnu_type, gnat_entity, false);
792 /* If this is an aliased object with an unconstrained nominal subtype,
793 make a type that includes the template. */
794 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
795 && Is_Array_Type (Etype (gnat_entity))
796 && !type_annotate_only)
799 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
802 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
803 concat_name (gnu_entity_name,
807 #ifdef MINIMUM_ATOMIC_ALIGNMENT
808 /* If the size is a constant and no alignment is specified, force
809 the alignment to be the minimum valid atomic alignment. The
810 restriction on constant size avoids problems with variable-size
811 temporaries; if the size is variable, there's no issue with
812 atomic access. Also don't do this for a constant, since it isn't
813 necessary and can interfere with constant replacement. Finally,
814 do not do it for Out parameters since that creates an
815 size inconsistency with In parameters. */
816 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
817 && !FLOAT_TYPE_P (gnu_type)
818 && !const_flag && No (Renamed_Object (gnat_entity))
819 && !imported_p && No (Address_Clause (gnat_entity))
820 && kind != E_Out_Parameter
821 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
822 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
823 align = MINIMUM_ATOMIC_ALIGNMENT;
826 /* Make a new type with the desired size and alignment, if needed.
827 But do not take into account alignment promotions to compute the
828 size of the object. */
829 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
830 if (gnu_size || align > 0)
831 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
832 "PAD", false, definition,
833 gnu_size ? true : false);
835 /* If this is a renaming, avoid as much as possible to create a new
836 object. However, in several cases, creating it is required.
837 This processing needs to be applied to the raw expression so
838 as to make it more likely to rename the underlying object. */
839 if (Present (Renamed_Object (gnat_entity)))
841 bool create_normal_object = false;
843 /* If the renamed object had padding, strip off the reference
844 to the inner object and reset our type. */
845 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
846 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
848 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
849 /* Strip useless conversions around the object. */
850 || (TREE_CODE (gnu_expr) == NOP_EXPR
851 && gnat_types_compatible_p
852 (TREE_TYPE (gnu_expr),
853 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
855 gnu_expr = TREE_OPERAND (gnu_expr, 0);
856 gnu_type = TREE_TYPE (gnu_expr);
859 /* Case 1: If this is a constant renaming stemming from a function
860 call, treat it as a normal object whose initial value is what
861 is being renamed. RM 3.3 says that the result of evaluating a
862 function call is a constant object. As a consequence, it can
863 be the inner object of a constant renaming. In this case, the
864 renaming must be fully instantiated, i.e. it cannot be a mere
865 reference to (part of) an existing object. */
868 tree inner_object = gnu_expr;
869 while (handled_component_p (inner_object))
870 inner_object = TREE_OPERAND (inner_object, 0);
871 if (TREE_CODE (inner_object) == CALL_EXPR)
872 create_normal_object = true;
875 /* Otherwise, see if we can proceed with a stabilized version of
876 the renamed entity or if we need to make a new object. */
877 if (!create_normal_object)
879 tree maybe_stable_expr = NULL_TREE;
882 /* Case 2: If the renaming entity need not be materialized and
883 the renamed expression is something we can stabilize, use
884 that for the renaming. At the global level, we can only do
885 this if we know no SAVE_EXPRs need be made, because the
886 expression we return might be used in arbitrary conditional
887 branches so we must force the SAVE_EXPRs evaluation
888 immediately and this requires a function context. */
889 if (!Materialize_Entity (gnat_entity)
890 && (!global_bindings_p ()
891 || (staticp (gnu_expr)
892 && !TREE_SIDE_EFFECTS (gnu_expr))))
895 = maybe_stabilize_reference (gnu_expr, true, &stable);
899 gnu_decl = maybe_stable_expr;
900 /* ??? No DECL_EXPR is created so we need to mark
901 the expression manually lest it is shared. */
902 if (global_bindings_p ())
903 mark_visited (&gnu_decl);
904 save_gnu_tree (gnat_entity, gnu_decl, true);
909 /* The stabilization failed. Keep maybe_stable_expr
910 untouched here to let the pointer case below know
911 about that failure. */
914 /* Case 3: If this is a constant renaming and creating a
915 new object is allowed and cheap, treat it as a normal
916 object whose initial value is what is being renamed. */
918 && !Is_Composite_Type
919 (Underlying_Type (Etype (gnat_entity))))
922 /* Case 4: Make this into a constant pointer to the object we
923 are to rename and attach the object to the pointer if it is
924 something we can stabilize.
926 From the proper scope, attached objects will be referenced
927 directly instead of indirectly via the pointer to avoid
928 subtle aliasing problems with non-addressable entities.
929 They have to be stable because we must not evaluate the
930 variables in the expression every time the renaming is used.
931 The pointer is called a "renaming" pointer in this case.
933 In the rare cases where we cannot stabilize the renamed
934 object, we just make a "bare" pointer, and the renamed
935 entity is always accessed indirectly through it. */
938 gnu_type = build_reference_type (gnu_type);
939 inner_const_flag = TREE_READONLY (gnu_expr);
942 /* If the previous attempt at stabilizing failed, there
943 is no point in trying again and we reuse the result
944 without attaching it to the pointer. In this case it
945 will only be used as the initializing expression of
946 the pointer and thus needs no special treatment with
947 regard to multiple evaluations. */
948 if (maybe_stable_expr)
951 /* Otherwise, try to stabilize and attach the expression
952 to the pointer if the stabilization succeeds.
954 Note that this might introduce SAVE_EXPRs and we don't
955 check whether we're at the global level or not. This
956 is fine since we are building a pointer initializer and
957 neither the pointer nor the initializing expression can
958 be accessed before the pointer elaboration has taken
959 place in a correct program.
961 These SAVE_EXPRs will be evaluated at the right place
962 by either the evaluation of the initializer for the
963 non-global case or the elaboration code for the global
964 case, and will be attached to the elaboration procedure
965 in the latter case. */
969 = maybe_stabilize_reference (gnu_expr, true, &stable);
972 renamed_obj = maybe_stable_expr;
974 /* Attaching is actually performed downstream, as soon
975 as we have a VAR_DECL for the pointer we make. */
979 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
981 gnu_size = NULL_TREE;
987 /* Make a volatile version of this object's type if we are to make
988 the object volatile. We also interpret 13.3(19) conservatively
989 and disallow any optimizations for such a non-constant object. */
990 if ((Treat_As_Volatile (gnat_entity)
992 && (Is_Exported (gnat_entity)
993 || Is_Imported (gnat_entity)
994 || Present (Address_Clause (gnat_entity)))))
995 && !TYPE_VOLATILE (gnu_type))
996 gnu_type = build_qualified_type (gnu_type,
997 (TYPE_QUALS (gnu_type)
998 | TYPE_QUAL_VOLATILE));
1000 /* If we are defining an aliased object whose nominal subtype is
1001 unconstrained, the object is a record that contains both the
1002 template and the object. If there is an initializer, it will
1003 have already been converted to the right type, but we need to
1004 create the template if there is no initializer. */
1007 && TREE_CODE (gnu_type) == RECORD_TYPE
1008 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1009 /* Beware that padding might have been introduced
1010 via maybe_pad_type above. */
1011 || (TYPE_IS_PADDING_P (gnu_type)
1012 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1014 && TYPE_CONTAINS_TEMPLATE_P
1015 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1018 = TYPE_IS_PADDING_P (gnu_type)
1019 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1020 : TYPE_FIELDS (gnu_type);
1023 = gnat_build_constructor
1027 build_template (TREE_TYPE (template_field),
1028 TREE_TYPE (TREE_CHAIN (template_field)),
1033 /* Convert the expression to the type of the object except in the
1034 case where the object's type is unconstrained or the object's type
1035 is a padded record whose field is of self-referential size. In
1036 the former case, converting will generate unnecessary evaluations
1037 of the CONSTRUCTOR to compute the size and in the latter case, we
1038 want to only copy the actual data. */
1040 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1041 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1042 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1043 && TYPE_IS_PADDING_P (gnu_type)
1044 && (CONTAINS_PLACEHOLDER_P
1045 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1046 gnu_expr = convert (gnu_type, gnu_expr);
1048 /* If this is a pointer and it does not have an initializing
1049 expression, initialize it to NULL, unless the object is
1052 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
1053 && !Is_Imported (gnat_entity) && !gnu_expr)
1054 gnu_expr = integer_zero_node;
1056 /* If we are defining the object and it has an Address clause, we must
1057 either get the address expression from the saved GCC tree for the
1058 object if it has a Freeze node, or elaborate the address expression
1059 here since the front-end has guaranteed that the elaboration has no
1060 effects in this case. */
1061 if (definition && Present (Address_Clause (gnat_entity)))
1064 = present_gnu_tree (gnat_entity)
1065 ? get_gnu_tree (gnat_entity)
1066 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1068 save_gnu_tree (gnat_entity, NULL_TREE, false);
1070 /* Ignore the size. It's either meaningless or was handled
1072 gnu_size = NULL_TREE;
1073 /* Convert the type of the object to a reference type that can
1074 alias everything as per 13.3(19). */
1076 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1077 gnu_address = convert (gnu_type, gnu_address);
1079 const_flag = !Is_Public (gnat_entity)
1080 || compile_time_known_address_p (Expression (Address_Clause
1083 /* If this is a deferred constant, the initializer is attached to
1085 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1088 (Expression (Declaration_Node (Full_View (gnat_entity))));
1090 /* If we don't have an initializing expression for the underlying
1091 variable, the initializing expression for the pointer is the
1092 specified address. Otherwise, we have to make a COMPOUND_EXPR
1093 to assign both the address and the initial value. */
1095 gnu_expr = gnu_address;
1098 = build2 (COMPOUND_EXPR, gnu_type,
1100 (MODIFY_EXPR, NULL_TREE,
1101 build_unary_op (INDIRECT_REF, NULL_TREE,
1107 /* If it has an address clause and we are not defining it, mark it
1108 as an indirect object. Likewise for Stdcall objects that are
1110 if ((!definition && Present (Address_Clause (gnat_entity)))
1111 || (Is_Imported (gnat_entity)
1112 && Has_Stdcall_Convention (gnat_entity)))
1114 /* Convert the type of the object to a reference type that can
1115 alias everything as per 13.3(19). */
1117 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1118 gnu_size = NULL_TREE;
1120 /* No point in taking the address of an initializing expression
1121 that isn't going to be used. */
1122 gnu_expr = NULL_TREE;
1124 /* If it has an address clause whose value is known at compile
1125 time, make the object a CONST_DECL. This will avoid a
1126 useless dereference. */
1127 if (Present (Address_Clause (gnat_entity)))
1129 Node_Id gnat_address
1130 = Expression (Address_Clause (gnat_entity));
1132 if (compile_time_known_address_p (gnat_address))
1134 gnu_expr = gnat_to_gnu (gnat_address);
1142 /* If we are at top level and this object is of variable size,
1143 make the actual type a hidden pointer to the real type and
1144 make the initializer be a memory allocation and initialization.
1145 Likewise for objects we aren't defining (presumed to be
1146 external references from other packages), but there we do
1147 not set up an initialization.
1149 If the object's size overflows, make an allocator too, so that
1150 Storage_Error gets raised. Note that we will never free
1151 such memory, so we presume it never will get allocated. */
1153 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1154 global_bindings_p () || !definition
1157 && ! allocatable_size_p (gnu_size,
1158 global_bindings_p () || !definition
1161 gnu_type = build_reference_type (gnu_type);
1162 gnu_size = NULL_TREE;
1166 /* In case this was a aliased object whose nominal subtype is
1167 unconstrained, the pointer above will be a thin pointer and
1168 build_allocator will automatically make the template.
1170 If we have a template initializer only (that we made above),
1171 pretend there is none and rely on what build_allocator creates
1172 again anyway. Otherwise (if we have a full initializer), get
1173 the data part and feed that to build_allocator.
1175 If we are elaborating a mutable object, tell build_allocator to
1176 ignore a possibly simpler size from the initializer, if any, as
1177 we must allocate the maximum possible size in this case. */
1181 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1183 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1184 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1187 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1189 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1190 && 1 == VEC_length (constructor_elt,
1191 CONSTRUCTOR_ELTS (gnu_expr)))
1195 = build_component_ref
1196 (gnu_expr, NULL_TREE,
1197 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1201 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1202 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1203 && !Is_Imported (gnat_entity))
1204 post_error ("?Storage_Error will be raised at run-time!",
1208 = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1209 Empty, Empty, gnat_entity, mutable_p);
1213 gnu_expr = NULL_TREE;
1218 /* If this object would go into the stack and has an alignment larger
1219 than the largest stack alignment the back-end can honor, resort to
1220 a variable of "aligning type". */
1221 if (!global_bindings_p () && !static_p && definition
1222 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1224 /* Create the new variable. No need for extra room before the
1225 aligned field as this is in automatic storage. */
1227 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1228 TYPE_SIZE_UNIT (gnu_type),
1229 BIGGEST_ALIGNMENT, 0);
1231 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1232 NULL_TREE, gnu_new_type, NULL_TREE, false,
1233 false, false, false, NULL, gnat_entity);
1235 /* Initialize the aligned field if we have an initializer. */
1238 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1240 (gnu_new_var, NULL_TREE,
1241 TYPE_FIELDS (gnu_new_type), false),
1245 /* And setup this entity as a reference to the aligned field. */
1246 gnu_type = build_reference_type (gnu_type);
1249 (ADDR_EXPR, gnu_type,
1250 build_component_ref (gnu_new_var, NULL_TREE,
1251 TYPE_FIELDS (gnu_new_type), false));
1253 gnu_size = NULL_TREE;
1259 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1260 | TYPE_QUAL_CONST));
1262 /* Convert the expression to the type of the object except in the
1263 case where the object's type is unconstrained or the object's type
1264 is a padded record whose field is of self-referential size. In
1265 the former case, converting will generate unnecessary evaluations
1266 of the CONSTRUCTOR to compute the size and in the latter case, we
1267 want to only copy the actual data. */
1269 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1270 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1271 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1272 && TYPE_IS_PADDING_P (gnu_type)
1273 && (CONTAINS_PLACEHOLDER_P
1274 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1275 gnu_expr = convert (gnu_type, gnu_expr);
1277 /* If this name is external or there was a name specified, use it,
1278 unless this is a VMS exception object since this would conflict
1279 with the symbol we need to export in addition. Don't use the
1280 Interface_Name if there is an address clause (see CD30005). */
1281 if (!Is_VMS_Exception (gnat_entity)
1282 && ((Present (Interface_Name (gnat_entity))
1283 && No (Address_Clause (gnat_entity)))
1284 || (Is_Public (gnat_entity)
1285 && (!Is_Imported (gnat_entity)
1286 || Is_Exported (gnat_entity)))))
1287 gnu_ext_name = create_concat_name (gnat_entity, NULL);
1289 /* If this is constant initialized to a static constant and the
1290 object has an aggregate type, force it to be statically
1291 allocated. This will avoid an initialization copy. */
1292 if (!static_p && const_flag
1293 && gnu_expr && TREE_CONSTANT (gnu_expr)
1294 && AGGREGATE_TYPE_P (gnu_type)
1295 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1296 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1297 && TYPE_IS_PADDING_P (gnu_type)
1298 && !host_integerp (TYPE_SIZE_UNIT
1299 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1302 gnu_decl = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1303 gnu_expr, const_flag,
1304 Is_Public (gnat_entity),
1305 imported_p || !definition,
1306 static_p, attr_list, gnat_entity);
1307 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1308 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1309 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1311 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1312 if (global_bindings_p ())
1314 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1315 record_global_renaming_pointer (gnu_decl);
1319 if (definition && DECL_SIZE_UNIT (gnu_decl)
1320 && get_block_jmpbuf_decl ()
1321 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1322 || (flag_stack_check == GENERIC_STACK_CHECK
1323 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1324 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1325 add_stmt_with_node (build_call_1_expr
1326 (update_setjmp_buf_decl,
1327 build_unary_op (ADDR_EXPR, NULL_TREE,
1328 get_block_jmpbuf_decl ())),
1331 /* If we are defining an Out parameter and we're not optimizing,
1332 create a fake PARM_DECL for debugging purposes and make it
1333 point to the VAR_DECL. Suppress debug info for the latter
1334 but make sure it will still live on the stack so it can be
1335 accessed from within the debugger through the PARM_DECL. */
1336 if (kind == E_Out_Parameter && definition && !optimize)
1338 tree param = create_param_decl (gnu_entity_name, gnu_type, false);
1339 gnat_pushdecl (param, gnat_entity);
1340 SET_DECL_VALUE_EXPR (param, gnu_decl);
1341 DECL_HAS_VALUE_EXPR_P (param) = 1;
1343 debug_info_p = false;
1345 DECL_IGNORED_P (param) = 1;
1346 TREE_ADDRESSABLE (gnu_decl) = 1;
1349 /* If this is a public constant or we're not optimizing and we're not
1350 making a VAR_DECL for it, make one just for export or debugger use.
1351 Likewise if the address is taken or if either the object or type is
1352 aliased. Make an external declaration for a reference, unless this
1353 is a Standard entity since there no real symbol at the object level
1355 if (TREE_CODE (gnu_decl) == CONST_DECL
1356 && (definition || Sloc (gnat_entity) > Standard_Location)
1357 && ((Is_Public (gnat_entity) && No (Address_Clause (gnat_entity)))
1359 || Address_Taken (gnat_entity)
1360 || Is_Aliased (gnat_entity)
1361 || Is_Aliased (Etype (gnat_entity))))
1364 = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1365 gnu_expr, true, Is_Public (gnat_entity),
1366 !definition, static_p, NULL,
1369 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1371 /* As debugging information will be generated for the variable,
1372 do not generate information for the constant. */
1373 DECL_IGNORED_P (gnu_decl) = 1;
1376 /* If this is declared in a block that contains a block with an
1377 exception handler, we must force this variable in memory to
1378 suppress an invalid optimization. */
1379 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1380 && Exception_Mechanism != Back_End_Exceptions)
1381 TREE_ADDRESSABLE (gnu_decl) = 1;
1383 gnu_type = TREE_TYPE (gnu_decl);
1385 /* Back-annotate Alignment and Esize of the object if not already
1386 known, except for when the object is actually a pointer to the
1387 real object, since alignment and size of a pointer don't have
1388 anything to do with those of the designated object. Note that
1389 we pick the values of the type, not those of the object, to
1390 shield ourselves from low-level platform-dependent adjustments
1391 like alignment promotion. This is both consistent with all the
1392 treatment above, where alignment and size are set on the type of
1393 the object and not on the object directly, and makes it possible
1394 to support confirming representation clauses in all cases. */
1396 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1397 Set_Alignment (gnat_entity,
1398 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
1400 if (!used_by_ref && Unknown_Esize (gnat_entity))
1402 if (TREE_CODE (gnu_type) == RECORD_TYPE
1403 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
1405 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
1407 Set_Esize (gnat_entity, annotate_value (gnu_object_size));
1413 /* Return a TYPE_DECL for "void" that we previously made. */
1414 gnu_decl = TYPE_NAME (void_type_node);
1417 case E_Enumeration_Type:
1418 /* A special case: for the types Character and Wide_Character in
1419 Standard, we do not list all the literals. So if the literals
1420 are not specified, make this an unsigned type. */
1421 if (No (First_Literal (gnat_entity)))
1423 gnu_type = make_unsigned_type (esize);
1424 TYPE_NAME (gnu_type) = gnu_entity_name;
1426 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1427 This is needed by the DWARF-2 back-end to distinguish between
1428 unsigned integer types and character types. */
1429 TYPE_STRING_FLAG (gnu_type) = 1;
1433 /* Normal case of non-character type or non-Standard character type. */
1435 /* Here we have a list of enumeral constants in First_Literal.
1436 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1437 the list to be placed into TYPE_FIELDS. Each node in the list
1438 is a TREE_LIST whose TREE_VALUE is the literal name and whose
1439 TREE_PURPOSE is the value of the literal. */
1441 Entity_Id gnat_literal;
1442 tree gnu_literal_list = NULL_TREE;
1444 if (Is_Unsigned_Type (gnat_entity))
1445 gnu_type = make_unsigned_type (esize);
1447 gnu_type = make_signed_type (esize);
1449 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1451 for (gnat_literal = First_Literal (gnat_entity);
1452 Present (gnat_literal);
1453 gnat_literal = Next_Literal (gnat_literal))
1455 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1458 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1459 gnu_type, gnu_value, true, false, false,
1460 false, NULL, gnat_literal);
1462 save_gnu_tree (gnat_literal, gnu_literal, false);
1463 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1464 gnu_value, gnu_literal_list);
1467 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1469 /* Note that the bounds are updated at the end of this function
1470 to avoid an infinite recursion since they refer to the type. */
1474 case E_Signed_Integer_Type:
1475 case E_Ordinary_Fixed_Point_Type:
1476 case E_Decimal_Fixed_Point_Type:
1477 /* For integer types, just make a signed type the appropriate number
1479 gnu_type = make_signed_type (esize);
1482 case E_Modular_Integer_Type:
1484 /* For modular types, make the unsigned type of the proper number
1485 of bits and then set up the modulus, if required. */
1486 tree gnu_modulus, gnu_high = NULL_TREE;
1488 /* Packed array types are supposed to be subtypes only. */
1489 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1491 gnu_type = make_unsigned_type (esize);
1493 /* Get the modulus in this type. If it overflows, assume it is because
1494 it is equal to 2**Esize. Note that there is no overflow checking
1495 done on unsigned type, so we detect the overflow by looking for
1496 a modulus of zero, which is otherwise invalid. */
1497 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1499 if (!integer_zerop (gnu_modulus))
1501 TYPE_MODULAR_P (gnu_type) = 1;
1502 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1503 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1504 convert (gnu_type, integer_one_node));
1507 /* If the upper bound is not maximal, make an extra subtype. */
1509 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1511 tree gnu_subtype = make_unsigned_type (esize);
1512 SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high);
1513 TREE_TYPE (gnu_subtype) = gnu_type;
1514 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1515 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1516 gnu_type = gnu_subtype;
1521 case E_Signed_Integer_Subtype:
1522 case E_Enumeration_Subtype:
1523 case E_Modular_Integer_Subtype:
1524 case E_Ordinary_Fixed_Point_Subtype:
1525 case E_Decimal_Fixed_Point_Subtype:
1527 /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
1528 not want to call create_range_type since we would like each subtype
1529 node to be distinct. ??? Historically this was in preparation for
1530 when memory aliasing is implemented, but that's obsolete now given
1531 the call to relate_alias_sets below.
1533 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1534 this fact is used by the arithmetic conversion functions.
1536 We elaborate the Ancestor_Subtype if it is not in the current unit
1537 and one of our bounds is non-static. We do this to ensure consistent
1538 naming in the case where several subtypes share the same bounds, by
1539 elaborating the first such subtype first, thus using its name. */
1542 && Present (Ancestor_Subtype (gnat_entity))
1543 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1544 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1545 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1546 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1548 /* Set the precision to the Esize except for bit-packed arrays. */
1549 if (Is_Packed_Array_Type (gnat_entity)
1550 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1551 esize = UI_To_Int (RM_Size (gnat_entity));
1553 /* This should be an unsigned type if the base type is unsigned or
1554 if the lower bound is constant and non-negative or if the type
1556 if (Is_Unsigned_Type (Etype (gnat_entity))
1557 || Is_Unsigned_Type (gnat_entity)
1558 || Has_Biased_Representation (gnat_entity))
1559 gnu_type = make_unsigned_type (esize);
1561 gnu_type = make_signed_type (esize);
1562 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1564 SET_TYPE_RM_MIN_VALUE
1566 convert (TREE_TYPE (gnu_type),
1567 elaborate_expression (Type_Low_Bound (gnat_entity),
1568 gnat_entity, get_identifier ("L"),
1570 Needs_Debug_Info (gnat_entity))));
1572 SET_TYPE_RM_MAX_VALUE
1574 convert (TREE_TYPE (gnu_type),
1575 elaborate_expression (Type_High_Bound (gnat_entity),
1576 gnat_entity, get_identifier ("U"),
1578 Needs_Debug_Info (gnat_entity))));
1580 /* One of the above calls might have caused us to be elaborated,
1581 so don't blow up if so. */
1582 if (present_gnu_tree (gnat_entity))
1584 maybe_present = true;
1588 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1589 = Has_Biased_Representation (gnat_entity);
1591 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
1592 TYPE_STUB_DECL (gnu_type)
1593 = create_type_stub_decl (gnu_entity_name, gnu_type);
1595 /* Inherit our alias set from what we're a subtype of. Subtypes
1596 are not different types and a pointer can designate any instance
1597 within a subtype hierarchy. */
1598 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1600 /* For a packed array, make the original array type a parallel type. */
1602 && Is_Packed_Array_Type (gnat_entity)
1603 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1604 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1606 (Original_Array_Type (gnat_entity)));
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 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;
1624 gnu_field_type = gnu_type;
1626 gnu_type = make_node (RECORD_TYPE);
1627 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1629 /* Propagate the alignment of the modular type to the record.
1630 This means that bit-packed arrays have "ceil" alignment for
1631 their size, which may seem counter-intuitive but makes it
1632 possible to easily overlay them on modular types. */
1633 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1634 TYPE_PACKED (gnu_type) = 1;
1636 /* Create a stripped-down declaration of the original type, mainly
1638 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1639 debug_info_p, gnat_entity);
1641 /* Don't notify the field as "addressable", since we won't be taking
1642 it's address and it would prevent create_field_decl from making a
1644 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1645 gnu_field_type, gnu_type, 1, 0, 0, 0);
1647 /* Do not finalize it until after the parallel type is added. */
1648 finish_record_type (gnu_type, gnu_field, 0, true);
1649 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1651 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1653 /* Make the original array type a parallel type. */
1655 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1656 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1658 (Original_Array_Type (gnat_entity)));
1660 rest_of_record_type_compilation (gnu_type);
1663 /* If the type we are dealing with has got a smaller alignment than the
1664 natural one, we need to wrap it up in a record type and under-align
1665 the latter. We reuse the padding machinery for this purpose. */
1666 else if (Present (Alignment_Clause (gnat_entity))
1667 && UI_Is_In_Int_Range (Alignment (gnat_entity))
1668 && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
1669 && align < TYPE_ALIGN (gnu_type))
1671 tree gnu_field_type, gnu_field;
1673 /* Set the RM size before wrapping up the type. */
1674 SET_TYPE_RM_SIZE (gnu_type,
1675 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1676 gnu_field_type = gnu_type;
1678 gnu_type = make_node (RECORD_TYPE);
1679 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1681 TYPE_ALIGN (gnu_type) = align;
1682 TYPE_PACKED (gnu_type) = 1;
1684 /* Create a stripped-down declaration of the original type, mainly
1686 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1687 debug_info_p, gnat_entity);
1689 /* Don't notify the field as "addressable", since we won't be taking
1690 it's address and it would prevent create_field_decl from making a
1692 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1693 gnu_field_type, gnu_type, 1, 0, 0, 0);
1695 finish_record_type (gnu_type, gnu_field, 0, false);
1696 TYPE_IS_PADDING_P (gnu_type) = 1;
1698 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1701 /* Otherwise reset the alignment lest we computed it above. */
1707 case E_Floating_Point_Type:
1708 /* If this is a VAX floating-point type, use an integer of the proper
1709 size. All the operations will be handled with ASM statements. */
1710 if (Vax_Float (gnat_entity))
1712 gnu_type = make_signed_type (esize);
1713 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1714 SET_TYPE_DIGITS_VALUE (gnu_type,
1715 UI_To_gnu (Digits_Value (gnat_entity),
1720 /* The type of the Low and High bounds can be our type if this is
1721 a type from Standard, so set them at the end of the function. */
1722 gnu_type = make_node (REAL_TYPE);
1723 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1724 layout_type (gnu_type);
1727 case E_Floating_Point_Subtype:
1728 if (Vax_Float (gnat_entity))
1730 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1736 && Present (Ancestor_Subtype (gnat_entity))
1737 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1738 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1739 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1740 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1743 gnu_type = make_node (REAL_TYPE);
1744 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1745 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1746 TYPE_GCC_MIN_VALUE (gnu_type)
1747 = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type));
1748 TYPE_GCC_MAX_VALUE (gnu_type)
1749 = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type));
1750 layout_type (gnu_type);
1752 SET_TYPE_RM_MIN_VALUE
1754 convert (TREE_TYPE (gnu_type),
1755 elaborate_expression (Type_Low_Bound (gnat_entity),
1756 gnat_entity, get_identifier ("L"),
1758 Needs_Debug_Info (gnat_entity))));
1760 SET_TYPE_RM_MAX_VALUE
1762 convert (TREE_TYPE (gnu_type),
1763 elaborate_expression (Type_High_Bound (gnat_entity),
1764 gnat_entity, get_identifier ("U"),
1766 Needs_Debug_Info (gnat_entity))));
1768 /* One of the above calls might have caused us to be elaborated,
1769 so don't blow up if so. */
1770 if (present_gnu_tree (gnat_entity))
1772 maybe_present = true;
1776 /* Inherit our alias set from what we're a subtype of, as for
1777 integer subtypes. */
1778 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1782 /* Array and String Types and Subtypes
1784 Unconstrained array types are represented by E_Array_Type and
1785 constrained array types are represented by E_Array_Subtype. There
1786 are no actual objects of an unconstrained array type; all we have
1787 are pointers to that type.
1789 The following fields are defined on array types and subtypes:
1791 Component_Type Component type of the array.
1792 Number_Dimensions Number of dimensions (an int).
1793 First_Index Type of first index. */
1798 Entity_Id gnat_index;
1799 const bool convention_fortran_p
1800 = (Convention (gnat_entity) == Convention_Fortran);
1801 const int ndim = Number_Dimensions (gnat_entity);
1802 tree gnu_template_fields = NULL_TREE;
1803 tree gnu_template_type = make_node (RECORD_TYPE);
1804 tree gnu_template_reference;
1805 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1806 tree gnu_fat_type = make_node (RECORD_TYPE);
1807 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
1808 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree));
1809 tree gnu_max_size = size_one_node, gnu_max_size_unit;
1810 tree gnu_comp_size, tem;
1813 TYPE_NAME (gnu_template_type)
1814 = create_concat_name (gnat_entity, "XUB");
1816 /* Make a node for the array. If we are not defining the array
1817 suppress expanding incomplete types. */
1818 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1822 defer_incomplete_level++;
1823 this_deferred = true;
1826 /* Build the fat pointer type. Use a "void *" object instead of
1827 a pointer to the array type since we don't have the array type
1828 yet (it will reference the fat pointer via the bounds). */
1829 tem = chainon (chainon (NULL_TREE,
1830 create_field_decl (get_identifier ("P_ARRAY"),
1833 NULL_TREE, NULL_TREE, 0)),
1834 create_field_decl (get_identifier ("P_BOUNDS"),
1837 NULL_TREE, NULL_TREE, 0));
1839 /* Make sure we can put this into a register. */
1840 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1842 /* Do not finalize this record type since the types of its fields
1843 are still incomplete at this point. */
1844 finish_record_type (gnu_fat_type, tem, 0, true);
1845 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1847 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1848 is the fat pointer. This will be used to access the individual
1849 fields once we build them. */
1850 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1851 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1852 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1853 gnu_template_reference
1854 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1855 TREE_READONLY (gnu_template_reference) = 1;
1857 /* Now create the GCC type for each index and add the fields for that
1858 index to the template. */
1859 for (index = (convention_fortran_p ? ndim - 1 : 0),
1860 gnat_index = First_Index (gnat_entity);
1861 0 <= index && index < ndim;
1862 index += (convention_fortran_p ? - 1 : 1),
1863 gnat_index = Next_Index (gnat_index))
1865 char field_name[16];
1866 tree gnu_index_base_type
1867 = get_unpadded_type (Base_Type (Etype (gnat_index)));
1868 tree gnu_low_field, gnu_high_field, gnu_low, gnu_high;
1870 /* Make the FIELD_DECLs for the low and high bounds of this
1871 type and then make extractions of these fields from the
1873 sprintf (field_name, "LB%d", index);
1874 gnu_low_field = create_field_decl (get_identifier (field_name),
1875 gnu_index_base_type,
1876 gnu_template_type, 0,
1877 NULL_TREE, NULL_TREE, 0);
1878 Sloc_to_locus (Sloc (gnat_entity),
1879 &DECL_SOURCE_LOCATION (gnu_low_field));
1881 field_name[0] = 'U';
1882 gnu_high_field = create_field_decl (get_identifier (field_name),
1883 gnu_index_base_type,
1884 gnu_template_type, 0,
1885 NULL_TREE, NULL_TREE, 0);
1886 Sloc_to_locus (Sloc (gnat_entity),
1887 &DECL_SOURCE_LOCATION (gnu_high_field));
1889 gnu_temp_fields[index] = chainon (gnu_low_field, gnu_high_field);
1891 /* We can't use build_component_ref here since the template type
1892 isn't complete yet. */
1893 gnu_low = build3 (COMPONENT_REF, gnu_index_base_type,
1894 gnu_template_reference, gnu_low_field,
1896 gnu_high = build3 (COMPONENT_REF, gnu_index_base_type,
1897 gnu_template_reference, gnu_high_field,
1899 TREE_READONLY (gnu_low) = TREE_READONLY (gnu_high) = 1;
1901 /* Make a range type with the new range in the Ada base type.
1902 Then make an index type with the new range in sizetype. */
1903 gnu_index_types[index]
1904 = create_index_type (convert (sizetype, gnu_low),
1905 convert (sizetype, gnu_high),
1906 create_range_type (gnu_index_base_type,
1910 /* Update the maximum size of the array in elements. */
1913 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
1915 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type));
1917 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type));
1919 = size_binop (MAX_EXPR,
1920 size_binop (PLUS_EXPR, size_one_node,
1921 size_binop (MINUS_EXPR,
1925 if (TREE_CODE (gnu_this_max) == INTEGER_CST
1926 && TREE_OVERFLOW (gnu_this_max))
1927 gnu_max_size = NULL_TREE;
1930 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
1933 TYPE_NAME (gnu_index_types[index])
1934 = create_concat_name (gnat_entity, field_name);
1937 for (index = 0; index < ndim; index++)
1939 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1941 /* Install all the fields into the template. */
1942 finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
1943 TYPE_READONLY (gnu_template_type) = 1;
1945 /* Now make the array of arrays and update the pointer to the array
1946 in the fat pointer. Note that it is the first field. */
1947 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1949 /* Try to get a smaller form of the component if needed. */
1950 if ((Is_Packed (gnat_entity)
1951 || Has_Component_Size_Clause (gnat_entity))
1952 && !Is_Bit_Packed_Array (gnat_entity)
1953 && !Has_Aliased_Components (gnat_entity)
1954 && !Strict_Alignment (Component_Type (gnat_entity))
1955 && TREE_CODE (tem) == RECORD_TYPE
1956 && !TYPE_IS_FAT_POINTER_P (tem)
1957 && host_integerp (TYPE_SIZE (tem), 1))
1958 tem = make_packable_type (tem, false);
1960 if (Has_Atomic_Components (gnat_entity))
1961 check_ok_for_atomic (tem, gnat_entity, true);
1963 /* Get and validate any specified Component_Size, but if Packed,
1964 ignore it since the front end will have taken care of it. */
1966 = validate_size (Component_Size (gnat_entity), tem,
1968 (Is_Bit_Packed_Array (gnat_entity)
1969 ? TYPE_DECL : VAR_DECL),
1970 true, Has_Component_Size_Clause (gnat_entity));
1972 /* If the component type is a RECORD_TYPE that has a self-referential
1973 size, use the maximum size. */
1975 && TREE_CODE (tem) == RECORD_TYPE
1976 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1977 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1979 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
1981 tree orig_tem = tem;
1982 unsigned int max_align;
1984 /* If an alignment is specified, use it as a cap on the component
1985 type so that it can be honored for the whole type. But ignore
1986 it for the original type of packed array types. */
1987 if (No (Packed_Array_Type (gnat_entity))
1988 && Known_Alignment (gnat_entity))
1989 max_align = validate_alignment (Alignment (gnat_entity),
1994 tem = make_type_from_size (tem, gnu_comp_size, false);
1995 if (max_align > 0 && TYPE_ALIGN (tem) > max_align)
2000 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
2001 "C_PAD", false, definition, true);
2003 /* If a padding record was made, declare it now since it will
2004 never be declared otherwise. This is necessary to ensure
2005 that its subtrees are properly marked. */
2006 if (tem != orig_tem)
2007 create_type_decl (TYPE_NAME (tem), tem, NULL, true,
2008 debug_info_p, gnat_entity);
2011 if (Has_Volatile_Components (gnat_entity))
2012 tem = build_qualified_type (tem,
2013 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
2015 /* If Component_Size is not already specified, annotate it with the
2016 size of the component. */
2017 if (Unknown_Component_Size (gnat_entity))
2018 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
2020 /* Compute the maximum size of the array in units and bits. */
2023 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2024 TYPE_SIZE_UNIT (tem));
2025 gnu_max_size = size_binop (MULT_EXPR,
2026 convert (bitsizetype, gnu_max_size),
2030 gnu_max_size_unit = NULL_TREE;
2032 /* Now build the array type. */
2033 for (index = ndim - 1; index >= 0; index--)
2035 tem = build_array_type (tem, gnu_index_types[index]);
2036 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
2037 if (array_type_has_nonaliased_component (gnat_entity, tem))
2038 TYPE_NONALIASED_COMPONENT (tem) = 1;
2041 /* If an alignment is specified, use it if valid. But ignore it
2042 for the original type of packed array types. If the alignment
2043 was requested with an explicit alignment clause, state so. */
2044 if (No (Packed_Array_Type (gnat_entity))
2045 && Known_Alignment (gnat_entity))
2048 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2050 if (Present (Alignment_Clause (gnat_entity)))
2051 TYPE_USER_ALIGN (tem) = 1;
2054 TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p;
2055 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2057 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2058 corresponding fat pointer. */
2059 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2060 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2061 SET_TYPE_MODE (gnu_type, BLKmode);
2062 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2063 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2065 /* If the maximum size doesn't overflow, use it. */
2067 && TREE_CODE (gnu_max_size) == INTEGER_CST
2068 && !TREE_OVERFLOW (gnu_max_size)
2069 && TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2070 && !TREE_OVERFLOW (gnu_max_size_unit))
2072 TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size,
2074 TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit,
2075 TYPE_SIZE_UNIT (tem));
2078 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2079 tem, NULL, !Comes_From_Source (gnat_entity),
2080 debug_info_p, gnat_entity);
2082 /* Give the fat pointer type a name. */
2083 create_type_decl (create_concat_name (gnat_entity, "XUP"),
2084 gnu_fat_type, NULL, true,
2085 debug_info_p, gnat_entity);
2087 /* Create the type to be used as what a thin pointer designates: an
2088 record type for the object and its template with the field offsets
2089 shifted to have the template at a negative offset. */
2090 tem = build_unc_object_type (gnu_template_type, tem,
2091 create_concat_name (gnat_entity, "XUT"));
2092 shift_unc_components_for_thin_pointers (tem);
2094 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2095 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2097 /* Give the thin pointer type a name. */
2098 create_type_decl (create_concat_name (gnat_entity, "XUX"),
2099 build_pointer_type (tem), NULL, true,
2100 debug_info_p, gnat_entity);
2104 case E_String_Subtype:
2105 case E_Array_Subtype:
2107 /* This is the actual data type for array variables. Multidimensional
2108 arrays are implemented as arrays of arrays. Note that arrays which
2109 have sparse enumeration subtypes as index components create sparse
2110 arrays, which is obviously space inefficient but so much easier to
2113 Also note that the subtype never refers to the unconstrained array
2114 type, which is somewhat at variance with Ada semantics.
2116 First check to see if this is simply a renaming of the array type.
2117 If so, the result is the array type. */
2119 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2120 if (!Is_Constrained (gnat_entity))
2124 Entity_Id gnat_index, gnat_base_index;
2125 const bool convention_fortran_p
2126 = (Convention (gnat_entity) == Convention_Fortran);
2127 const int ndim = Number_Dimensions (gnat_entity);
2128 tree gnu_base_type = gnu_type;
2129 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
2130 tree gnu_max_size = size_one_node, gnu_max_size_unit;
2131 bool need_index_type_struct = false;
2134 /* First create the GCC type for each index and find out whether
2135 special types are needed for debugging information. */
2136 for (index = (convention_fortran_p ? ndim - 1 : 0),
2137 gnat_index = First_Index (gnat_entity),
2139 = First_Index (Implementation_Base_Type (gnat_entity));
2140 0 <= index && index < ndim;
2141 index += (convention_fortran_p ? - 1 : 1),
2142 gnat_index = Next_Index (gnat_index),
2143 gnat_base_index = Next_Index (gnat_base_index))
2145 tree gnu_index_type = get_unpadded_type (Etype (gnat_index));
2146 tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type);
2147 tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type);
2148 tree gnu_min = convert (sizetype, gnu_orig_min);
2149 tree gnu_max = convert (sizetype, gnu_orig_max);
2150 tree gnu_base_index_type
2151 = get_unpadded_type (Etype (gnat_base_index));
2152 tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type);
2153 tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type);
2156 /* See if the base array type is already flat. If it is, we
2157 are probably compiling an ACATS test but it will cause the
2158 code below to malfunction if we don't handle it specially. */
2159 if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST
2160 && TREE_CODE (gnu_base_orig_max) == INTEGER_CST
2161 && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min))
2163 gnu_min = size_one_node;
2164 gnu_max = size_zero_node;
2168 /* Similarly, if one of the values overflows in sizetype and the
2169 range is null, use 1..0 for the sizetype bounds. */
2170 else if ((TYPE_PRECISION (gnu_index_type)
2171 > TYPE_PRECISION (sizetype)
2172 || TYPE_UNSIGNED (gnu_index_type)
2173 != TYPE_UNSIGNED (sizetype))
2174 && TREE_CODE (gnu_min) == INTEGER_CST
2175 && TREE_CODE (gnu_max) == INTEGER_CST
2176 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2177 && tree_int_cst_lt (gnu_orig_max, gnu_orig_min))
2179 gnu_min = size_one_node;
2180 gnu_max = size_zero_node;
2184 /* If the minimum and maximum values both overflow in sizetype,
2185 but the difference in the original type does not overflow in
2186 sizetype, ignore the overflow indication. */
2187 else if ((TYPE_PRECISION (gnu_index_type)
2188 > TYPE_PRECISION (sizetype)
2189 || TYPE_UNSIGNED (gnu_index_type)
2190 != TYPE_UNSIGNED (sizetype))
2191 && TREE_CODE (gnu_min) == INTEGER_CST
2192 && TREE_CODE (gnu_max) == INTEGER_CST
2193 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2196 fold_build2 (MINUS_EXPR, gnu_index_type,
2200 TREE_OVERFLOW (gnu_min) = 0;
2201 TREE_OVERFLOW (gnu_max) = 0;
2207 /* Now compute the size of this bound. We need to provide
2208 GCC with an upper bound to use but have to deal with the
2209 "superflat" case. There are three ways to do this. If
2210 we can prove that the array can never be superflat, we
2211 can just use the high bound of the index subtype. If we
2212 can prove that the low bound minus one can't overflow,
2213 we can do this as MAX (hb, lb - 1). Otherwise, we have
2214 to use the expression hb >= lb ? hb : lb - 1. */
2215 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2217 /* If gnu_high is a constant that has overflowed, the array
2218 cannot be superflat. */
2219 if (TREE_CODE (gnu_high) == INTEGER_CST
2220 && TREE_OVERFLOW (gnu_high))
2223 /* gnu_high cannot overflow if the subtype is unsigned and
2224 sizetype is signed, or if it is a constant that hasn't
2226 else if ((TYPE_UNSIGNED (gnu_index_type)
2227 && !TYPE_UNSIGNED (sizetype))
2228 || TREE_CODE (gnu_high) == INTEGER_CST)
2229 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2233 = build_cond_expr (sizetype,
2234 build_binary_op (GE_EXPR,
2240 gnu_index_types[index]
2241 = create_index_type (gnu_min, gnu_high, gnu_index_type,
2244 /* Update the maximum size of the array in elements. Here we
2245 see if any constraint on the index type of the base type
2246 can be used in the case of self-referential bound on the
2247 index type of the subtype. We look for a non-"infinite"
2248 and non-self-referential bound from any type involved and
2249 handle each bound separately. */
2252 tree gnu_base_min = convert (sizetype, gnu_base_orig_min);
2253 tree gnu_base_max = convert (sizetype, gnu_base_orig_max);
2254 tree gnu_base_index_base_type
2255 = get_base_type (gnu_base_index_type);
2256 tree gnu_base_base_min
2257 = convert (sizetype,
2258 TYPE_MIN_VALUE (gnu_base_index_base_type));
2259 tree gnu_base_base_max
2260 = convert (sizetype,
2261 TYPE_MAX_VALUE (gnu_base_index_base_type));
2263 if (!CONTAINS_PLACEHOLDER_P (gnu_min)
2264 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2265 && !TREE_OVERFLOW (gnu_base_min)))
2266 gnu_base_min = gnu_min;
2268 if (!CONTAINS_PLACEHOLDER_P (gnu_max)
2269 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2270 && !TREE_OVERFLOW (gnu_base_max)))
2271 gnu_base_max = gnu_max;
2273 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2274 && TREE_OVERFLOW (gnu_base_min))
2275 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2276 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2277 && TREE_OVERFLOW (gnu_base_max))
2278 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2279 gnu_max_size = NULL_TREE;
2283 = size_binop (MAX_EXPR,
2284 size_binop (PLUS_EXPR, size_one_node,
2285 size_binop (MINUS_EXPR,
2290 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2291 && TREE_OVERFLOW (gnu_this_max))
2292 gnu_max_size = NULL_TREE;
2295 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2299 /* We need special types for debugging information to point to
2300 the index types if they have variable bounds, are not integer
2301 types, are biased or are wider than sizetype. */
2302 if (!integer_onep (gnu_orig_min)
2303 || TREE_CODE (gnu_orig_max) != INTEGER_CST
2304 || TREE_CODE (gnu_index_type) != INTEGER_TYPE
2305 || (TREE_TYPE (gnu_index_type)
2306 && TREE_CODE (TREE_TYPE (gnu_index_type))
2308 || TYPE_BIASED_REPRESENTATION_P (gnu_index_type)
2309 || (TYPE_PRECISION (gnu_index_type)
2310 > TYPE_PRECISION (sizetype)))
2311 need_index_type_struct = true;
2314 /* Then flatten: create the array of arrays. For an array type
2315 used to implement a packed array, get the component type from
2316 the original array type since the representation clauses that
2317 can affect it are on the latter. */
2318 if (Is_Packed_Array_Type (gnat_entity)
2319 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2321 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2322 for (index = ndim - 1; index >= 0; index--)
2323 gnu_type = TREE_TYPE (gnu_type);
2325 /* One of the above calls might have caused us to be elaborated,
2326 so don't blow up if so. */
2327 if (present_gnu_tree (gnat_entity))
2329 maybe_present = true;
2337 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
2339 /* One of the above calls might have caused us to be elaborated,
2340 so don't blow up if so. */
2341 if (present_gnu_tree (gnat_entity))
2343 maybe_present = true;
2347 /* Try to get a smaller form of the component if needed. */
2348 if ((Is_Packed (gnat_entity)
2349 || Has_Component_Size_Clause (gnat_entity))
2350 && !Is_Bit_Packed_Array (gnat_entity)
2351 && !Has_Aliased_Components (gnat_entity)
2352 && !Strict_Alignment (Component_Type (gnat_entity))
2353 && TREE_CODE (gnu_type) == RECORD_TYPE
2354 && !TYPE_IS_FAT_POINTER_P (gnu_type)
2355 && host_integerp (TYPE_SIZE (gnu_type), 1))
2356 gnu_type = make_packable_type (gnu_type, false);
2358 /* Get and validate any specified Component_Size, but if Packed,
2359 ignore it since the front end will have taken care of it. */
2361 = validate_size (Component_Size (gnat_entity), gnu_type,
2363 (Is_Bit_Packed_Array (gnat_entity)
2364 ? TYPE_DECL : VAR_DECL), true,
2365 Has_Component_Size_Clause (gnat_entity));
2367 /* If the component type is a RECORD_TYPE that has a
2368 self-referential size, use the maximum size. */
2370 && TREE_CODE (gnu_type) == RECORD_TYPE
2371 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2372 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
2374 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
2376 tree orig_gnu_type = gnu_type;
2377 unsigned int max_align;
2379 /* If an alignment is specified, use it as a cap on the
2380 component type so that it can be honored for the whole
2381 type. But ignore it for the original type of packed
2383 if (No (Packed_Array_Type (gnat_entity))
2384 && Known_Alignment (gnat_entity))
2385 max_align = validate_alignment (Alignment (gnat_entity),
2391 = make_type_from_size (gnu_type, gnu_comp_size, false);
2392 if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
2393 gnu_type = orig_gnu_type;
2395 orig_gnu_type = gnu_type;
2397 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
2398 gnat_entity, "C_PAD", false,
2401 /* If a padding record was made, declare it now since it
2402 will never be declared otherwise. This is necessary
2403 to ensure that its subtrees are properly marked. */
2404 if (gnu_type != orig_gnu_type)
2405 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL,
2406 true, debug_info_p, gnat_entity);
2409 if (Has_Volatile_Components (Base_Type (gnat_entity)))
2410 gnu_type = build_qualified_type (gnu_type,
2411 (TYPE_QUALS (gnu_type)
2412 | TYPE_QUAL_VOLATILE));
2415 /* Compute the maximum size of the array in units and bits. */
2418 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2419 TYPE_SIZE_UNIT (gnu_type));
2420 gnu_max_size = size_binop (MULT_EXPR,
2421 convert (bitsizetype, gnu_max_size),
2422 TYPE_SIZE (gnu_type));
2425 gnu_max_size_unit = NULL_TREE;
2427 /* Now build the array type. */
2428 for (index = ndim - 1; index >= 0; index --)
2430 gnu_type = build_array_type (gnu_type, gnu_index_types[index]);
2431 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2432 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2433 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2436 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2437 TYPE_STUB_DECL (gnu_type)
2438 = create_type_stub_decl (gnu_entity_name, gnu_type);
2440 /* If we are at file level and this is a multi-dimensional array,
2441 we need to make a variable corresponding to the stride of the
2442 inner dimensions. */
2443 if (global_bindings_p () && ndim > 1)
2445 tree gnu_str_name = get_identifier ("ST");
2448 for (gnu_arr_type = TREE_TYPE (gnu_type);
2449 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2450 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2451 gnu_str_name = concat_name (gnu_str_name, "ST"))
2453 tree eltype = TREE_TYPE (gnu_arr_type);
2455 TYPE_SIZE (gnu_arr_type)
2456 = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type),
2457 gnat_entity, gnu_str_name,
2460 /* ??? For now, store the size as a multiple of the
2461 alignment of the element type in bytes so that we
2462 can see the alignment from the tree. */
2463 TYPE_SIZE_UNIT (gnu_arr_type)
2465 (MULT_EXPR, sizetype,
2466 elaborate_expression_1
2467 (build_binary_op (EXACT_DIV_EXPR, sizetype,
2468 TYPE_SIZE_UNIT (gnu_arr_type),
2469 size_int (TYPE_ALIGN (eltype)
2471 gnat_entity, concat_name (gnu_str_name, "A_U"),
2473 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2475 /* ??? create_type_decl is not invoked on the inner types so
2476 the MULT_EXPR node built above will never be marked. */
2477 mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type));
2481 /* If we need to write out a record type giving the names of the
2482 bounds for debugging purposes, do it now and make the record
2483 type a parallel type. This is not needed for a packed array
2484 since the bounds are conveyed by the original array type. */
2485 if (need_index_type_struct
2487 && !Is_Packed_Array_Type (gnat_entity))
2489 tree gnu_bound_rec = make_node (RECORD_TYPE);
2490 tree gnu_field_list = NULL_TREE;
2493 TYPE_NAME (gnu_bound_rec)
2494 = create_concat_name (gnat_entity, "XA");
2496 for (index = ndim - 1; index >= 0; index--)
2498 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]);
2499 tree gnu_index_name = TYPE_NAME (gnu_index);
2501 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2502 gnu_index_name = DECL_NAME (gnu_index_name);
2504 /* Make sure to reference the types themselves, and not just
2505 their names, as the debugger may fall back on them. */
2506 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2508 0, NULL_TREE, NULL_TREE, 0);
2509 TREE_CHAIN (gnu_field) = gnu_field_list;
2510 gnu_field_list = gnu_field;
2513 finish_record_type (gnu_bound_rec, gnu_field_list, 0, false);
2514 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2517 /* Otherwise, for a packed array, make the original array type a
2519 else if (debug_info_p
2520 && Is_Packed_Array_Type (gnat_entity)
2521 && present_gnu_tree (Original_Array_Type (gnat_entity)))
2522 add_parallel_type (TYPE_STUB_DECL (gnu_type),
2524 (Original_Array_Type (gnat_entity)));
2526 TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p;
2527 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2528 = (Is_Packed_Array_Type (gnat_entity)
2529 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2531 /* If the size is self-referential and the maximum size doesn't
2532 overflow, use it. */
2533 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2535 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2536 && TREE_OVERFLOW (gnu_max_size))
2537 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2538 && TREE_OVERFLOW (gnu_max_size_unit)))
2540 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2541 TYPE_SIZE (gnu_type));
2542 TYPE_SIZE_UNIT (gnu_type)
2543 = size_binop (MIN_EXPR, gnu_max_size_unit,
2544 TYPE_SIZE_UNIT (gnu_type));
2547 /* Set our alias set to that of our base type. This gives all
2548 array subtypes the same alias set. */
2549 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2552 /* If this is a packed type, make this type the same as the packed
2553 array type, but do some adjusting in the type first. */
2554 if (Present (Packed_Array_Type (gnat_entity)))
2556 Entity_Id gnat_index;
2557 tree gnu_inner_type;
2559 /* First finish the type we had been making so that we output
2560 debugging information for it. */
2562 = build_qualified_type (gnu_type,
2563 (TYPE_QUALS (gnu_type)
2564 | (TYPE_QUAL_VOLATILE
2565 * Treat_As_Volatile (gnat_entity))));
2567 /* Make it artificial only if the base type was artificial as well.
2568 That's sort of "morally" true and will make it possible for the
2569 debugger to look it up by name in DWARF, which is necessary in
2570 order to decode the packed array type. */
2572 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2573 !Comes_From_Source (gnat_entity)
2574 && !Comes_From_Source (Etype (gnat_entity)),
2575 debug_info_p, gnat_entity);
2577 /* Save it as our equivalent in case the call below elaborates
2579 save_gnu_tree (gnat_entity, gnu_decl, false);
2581 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2583 this_made_decl = true;
2584 gnu_type = TREE_TYPE (gnu_decl);
2585 save_gnu_tree (gnat_entity, NULL_TREE, false);
2587 gnu_inner_type = gnu_type;
2588 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2589 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2590 || TYPE_IS_PADDING_P (gnu_inner_type)))
2591 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2593 /* We need to attach the index type to the type we just made so
2594 that the actual bounds can later be put into a template. */
2595 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2596 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2597 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2598 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2600 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2602 /* The TYPE_ACTUAL_BOUNDS field is overloaded with the
2603 TYPE_MODULUS for modular types so we make an extra
2604 subtype if necessary. */
2605 if (TYPE_MODULAR_P (gnu_inner_type))
2608 = make_unsigned_type (TYPE_PRECISION (gnu_inner_type));
2609 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2610 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2611 SET_TYPE_RM_MIN_VALUE (gnu_subtype,
2612 TYPE_MIN_VALUE (gnu_inner_type));
2613 SET_TYPE_RM_MAX_VALUE (gnu_subtype,
2614 TYPE_MAX_VALUE (gnu_inner_type));
2615 gnu_inner_type = gnu_subtype;
2618 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2620 #ifdef ENABLE_CHECKING
2621 /* Check for other cases of overloading. */
2622 gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner_type));
2626 /* ??? This is necessary to make sure that the container is
2627 allocated with a null tree upfront; otherwise, it could
2628 be allocated with an uninitialized tree that is accessed
2629 before being set below. See ada-tree.h for details. */
2630 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2632 for (gnat_index = First_Index (gnat_entity);
2633 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2634 SET_TYPE_ACTUAL_BOUNDS
2636 tree_cons (NULL_TREE,
2637 get_unpadded_type (Etype (gnat_index)),
2638 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2640 if (Convention (gnat_entity) != Convention_Fortran)
2641 SET_TYPE_ACTUAL_BOUNDS
2643 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2645 if (TREE_CODE (gnu_type) == RECORD_TYPE
2646 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2647 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2651 /* Abort if packed array with no packed array type field set. */
2653 gcc_assert (!Is_Packed (gnat_entity));
2657 case E_String_Literal_Subtype:
2658 /* Create the type for a string literal. */
2660 Entity_Id gnat_full_type
2661 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2662 && Present (Full_View (Etype (gnat_entity)))
2663 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2664 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2665 tree gnu_string_array_type
2666 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2667 tree gnu_string_index_type
2668 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2669 (TYPE_DOMAIN (gnu_string_array_type))));
2670 tree gnu_lower_bound
2671 = convert (gnu_string_index_type,
2672 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2673 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2674 tree gnu_length = ssize_int (length - 1);
2675 tree gnu_upper_bound
2676 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2678 convert (gnu_string_index_type, gnu_length));
2680 = create_index_type (convert (sizetype, gnu_lower_bound),
2681 convert (sizetype, gnu_upper_bound),
2682 create_range_type (gnu_string_index_type,
2688 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2690 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2691 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2692 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2696 /* Record Types and Subtypes
2698 The following fields are defined on record types:
2700 Has_Discriminants True if the record has discriminants
2701 First_Discriminant Points to head of list of discriminants
2702 First_Entity Points to head of list of fields
2703 Is_Tagged_Type True if the record is tagged
2705 Implementation of Ada records and discriminated records:
2707 A record type definition is transformed into the equivalent of a C
2708 struct definition. The fields that are the discriminants which are
2709 found in the Full_Type_Declaration node and the elements of the
2710 Component_List found in the Record_Type_Definition node. The
2711 Component_List can be a recursive structure since each Variant of
2712 the Variant_Part of the Component_List has a Component_List.
2714 Processing of a record type definition comprises starting the list of
2715 field declarations here from the discriminants and the calling the
2716 function components_to_record to add the rest of the fields from the
2717 component list and return the gnu type node. The function
2718 components_to_record will call itself recursively as it traverses
2722 if (Has_Complex_Representation (gnat_entity))
2725 = build_complex_type
2727 (Etype (Defining_Entity
2728 (First (Component_Items
2731 (Declaration_Node (gnat_entity)))))))));
2737 Node_Id full_definition = Declaration_Node (gnat_entity);
2738 Node_Id record_definition = Type_Definition (full_definition);
2739 Entity_Id gnat_field;
2740 tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent;
2741 /* Set PACKED in keeping with gnat_to_gnu_field. */
2743 = Is_Packed (gnat_entity)
2745 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2747 : (Known_Alignment (gnat_entity)
2748 || (Strict_Alignment (gnat_entity)
2749 && Known_Static_Esize (gnat_entity)))
2752 bool has_discr = Has_Discriminants (gnat_entity);
2753 bool has_rep = Has_Specified_Layout (gnat_entity);
2754 bool all_rep = has_rep;
2756 = (Is_Tagged_Type (gnat_entity)
2757 && Nkind (record_definition) == N_Derived_Type_Definition);
2758 bool is_unchecked_union = Is_Unchecked_Union (gnat_entity);
2760 /* See if all fields have a rep clause. Stop when we find one
2763 for (gnat_field = First_Entity (gnat_entity);
2764 Present (gnat_field);
2765 gnat_field = Next_Entity (gnat_field))
2766 if ((Ekind (gnat_field) == E_Component
2767 || Ekind (gnat_field) == E_Discriminant)
2768 && No (Component_Clause (gnat_field)))
2774 /* If this is a record extension, go a level further to find the
2775 record definition. Also, verify we have a Parent_Subtype. */
2778 if (!type_annotate_only
2779 || Present (Record_Extension_Part (record_definition)))
2780 record_definition = Record_Extension_Part (record_definition);
2782 gcc_assert (type_annotate_only
2783 || Present (Parent_Subtype (gnat_entity)));
2786 /* Make a node for the record. If we are not defining the record,
2787 suppress expanding incomplete types. */
2788 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2789 TYPE_NAME (gnu_type) = gnu_entity_name;
2790 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2794 defer_incomplete_level++;
2795 this_deferred = true;
2798 /* If both a size and rep clause was specified, put the size in
2799 the record type now so that it can get the proper mode. */
2800 if (has_rep && Known_Esize (gnat_entity))
2801 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2803 /* Always set the alignment here so that it can be used to
2804 set the mode, if it is making the alignment stricter. If
2805 it is invalid, it will be checked again below. If this is to
2806 be Atomic, choose a default alignment of a word unless we know
2807 the size and it's smaller. */
2808 if (Known_Alignment (gnat_entity))
2809 TYPE_ALIGN (gnu_type)
2810 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2811 else if (Is_Atomic (gnat_entity))
2812 TYPE_ALIGN (gnu_type)
2813 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2814 /* If a type needs strict alignment, the minimum size will be the
2815 type size instead of the RM size (see validate_size). Cap the
2816 alignment, lest it causes this type size to become too large. */
2817 else if (Strict_Alignment (gnat_entity)
2818 && Known_Static_Esize (gnat_entity))
2820 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2821 unsigned int raw_align = raw_size & -raw_size;
2822 if (raw_align < BIGGEST_ALIGNMENT)
2823 TYPE_ALIGN (gnu_type) = raw_align;
2826 TYPE_ALIGN (gnu_type) = 0;
2828 /* If we have a Parent_Subtype, make a field for the parent. If
2829 this record has rep clauses, force the position to zero. */
2830 if (Present (Parent_Subtype (gnat_entity)))
2832 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2835 /* A major complexity here is that the parent subtype will
2836 reference our discriminants in its Discriminant_Constraint
2837 list. But those must reference the parent component of this
2838 record which is of the parent subtype we have not built yet!
2839 To break the circle we first build a dummy COMPONENT_REF which
2840 represents the "get to the parent" operation and initialize
2841 each of those discriminants to a COMPONENT_REF of the above
2842 dummy parent referencing the corresponding discriminant of the
2843 base type of the parent subtype. */
2844 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2845 build0 (PLACEHOLDER_EXPR, gnu_type),
2846 build_decl (input_location,
2847 FIELD_DECL, NULL_TREE,
2852 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2853 Present (gnat_field);
2854 gnat_field = Next_Stored_Discriminant (gnat_field))
2855 if (Present (Corresponding_Discriminant (gnat_field)))
2858 build3 (COMPONENT_REF,
2859 get_unpadded_type (Etype (gnat_field)),
2861 gnat_to_gnu_field_decl (Corresponding_Discriminant
2866 /* Then we build the parent subtype. If it has discriminants but
2867 the type itself has unknown discriminants, this means that it
2868 doesn't contain information about how the discriminants are
2869 derived from those of the ancestor type, so it cannot be used
2870 directly. Instead it is built by cloning the parent subtype
2871 of the underlying record view of the type, for which the above
2872 derivation of discriminants has been made explicit. */
2873 if (Has_Discriminants (gnat_parent)
2874 && Has_Unknown_Discriminants (gnat_entity))
2876 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2878 /* If we are defining the type, the underlying record
2879 view must already have been elaborated at this point.
2880 Otherwise do it now as its parent subtype cannot be
2881 technically elaborated on its own. */
2883 gcc_assert (present_gnu_tree (gnat_uview));
2885 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2887 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2889 /* Substitute the "get to the parent" of the type for that
2890 of its underlying record view in the cloned type. */
2891 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2892 Present (gnat_field);
2893 gnat_field = Next_Stored_Discriminant (gnat_field))
2894 if (Present (Corresponding_Discriminant (gnat_field)))
2896 gnu_field = gnat_to_gnu_field_decl (gnat_field);
2898 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2899 gnu_get_parent, gnu_field, NULL_TREE);
2901 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2905 gnu_parent = gnat_to_gnu_type (gnat_parent);
2907 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2908 initially built. The discriminants must reference the fields
2909 of the parent subtype and not those of its base type for the
2910 placeholder machinery to properly work. */
2913 /* The actual parent subtype is the full view. */
2914 if (IN (Ekind (gnat_parent), Private_Kind))
2916 if (Present (Full_View (gnat_parent)))
2917 gnat_parent = Full_View (gnat_parent);
2919 gnat_parent = Underlying_Full_View (gnat_parent);
2922 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2923 Present (gnat_field);
2924 gnat_field = Next_Stored_Discriminant (gnat_field))
2925 if (Present (Corresponding_Discriminant (gnat_field)))
2927 Entity_Id field = Empty;
2928 for (field = First_Stored_Discriminant (gnat_parent);
2930 field = Next_Stored_Discriminant (field))
2931 if (same_discriminant_p (gnat_field, field))
2933 gcc_assert (Present (field));
2934 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2935 = gnat_to_gnu_field_decl (field);
2939 /* The "get to the parent" COMPONENT_REF must be given its
2941 TREE_TYPE (gnu_get_parent) = gnu_parent;
2943 /* ...and reference the _Parent field of this record. */
2945 = create_field_decl (get_identifier
2946 (Get_Name_String (Name_uParent)),
2947 gnu_parent, gnu_type, 0,
2949 ? TYPE_SIZE (gnu_parent) : NULL_TREE,
2951 ? bitsize_zero_node : NULL_TREE, 1);
2952 DECL_INTERNAL_P (gnu_field) = 1;
2953 TREE_OPERAND (gnu_get_parent, 1) = gnu_field;
2954 TYPE_FIELDS (gnu_type) = gnu_field;
2957 /* Make the fields for the discriminants and put them into the record
2958 unless it's an Unchecked_Union. */
2960 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2961 Present (gnat_field);
2962 gnat_field = Next_Stored_Discriminant (gnat_field))
2964 /* If this is a record extension and this discriminant is the
2965 renaming of another discriminant, we've handled it above. */
2966 if (Present (Parent_Subtype (gnat_entity))
2967 && Present (Corresponding_Discriminant (gnat_field)))
2971 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2973 /* Make an expression using a PLACEHOLDER_EXPR from the
2974 FIELD_DECL node just created and link that with the
2975 corresponding GNAT defining identifier. */
2976 save_gnu_tree (gnat_field,
2977 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2978 build0 (PLACEHOLDER_EXPR, gnu_type),
2979 gnu_field, NULL_TREE),
2982 if (!is_unchecked_union)
2984 TREE_CHAIN (gnu_field) = gnu_field_list;
2985 gnu_field_list = gnu_field;
2989 /* Add the fields into the record type and finish it up. */
2990 components_to_record (gnu_type, Component_List (record_definition),
2991 gnu_field_list, packed, definition, NULL,
2992 false, all_rep, false, is_unchecked_union);
2994 /* If it is a tagged record force the type to BLKmode to insure that
2995 these objects will always be put in memory. Likewise for limited
2997 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2998 SET_TYPE_MODE (gnu_type, BLKmode);
3000 /* We used to remove the associations of the discriminants and _Parent
3001 for validity checking but we may need them if there's a Freeze_Node
3002 for a subtype used in this record. */
3003 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3005 /* Fill in locations of fields. */
3006 annotate_rep (gnat_entity, gnu_type);
3008 /* If there are any entities in the chain corresponding to components
3009 that we did not elaborate, ensure we elaborate their types if they
3011 for (gnat_temp = First_Entity (gnat_entity);
3012 Present (gnat_temp);
3013 gnat_temp = Next_Entity (gnat_temp))
3014 if ((Ekind (gnat_temp) == E_Component
3015 || Ekind (gnat_temp) == E_Discriminant)
3016 && Is_Itype (Etype (gnat_temp))
3017 && !present_gnu_tree (gnat_temp))
3018 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3022 case E_Class_Wide_Subtype:
3023 /* If an equivalent type is present, that is what we should use.
3024 Otherwise, fall through to handle this like a record subtype
3025 since it may have constraints. */
3026 if (gnat_equiv_type != gnat_entity)
3028 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
3029 maybe_present = true;
3033 /* ... fall through ... */
3035 case E_Record_Subtype:
3036 /* If Cloned_Subtype is Present it means this record subtype has
3037 identical layout to that type or subtype and we should use
3038 that GCC type for this one. The front end guarantees that
3039 the component list is shared. */
3040 if (Present (Cloned_Subtype (gnat_entity)))
3042 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
3044 maybe_present = true;
3048 /* Otherwise, first ensure the base type is elaborated. Then, if we are
3049 changing the type, make a new type with each field having the type of
3050 the field in the new subtype but the position computed by transforming
3051 every discriminant reference according to the constraints. We don't
3052 see any difference between private and non-private type here since
3053 derivations from types should have been deferred until the completion
3054 of the private type. */
3057 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
3062 defer_incomplete_level++;
3063 this_deferred = true;
3066 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
3068 if (present_gnu_tree (gnat_entity))
3070 maybe_present = true;
3074 /* When the subtype has discriminants and these discriminants affect
3075 the initial shape it has inherited, factor them in. But for the
3076 of an Unchecked_Union (it must be an Itype), just return the type.
3078 We can't just test Is_Constrained because private subtypes without
3079 discriminants of types with discriminants with default expressions
3080 are Is_Constrained but aren't constrained! */
3081 if (IN (Ekind (gnat_base_type), Record_Kind)
3082 && !Is_Unchecked_Union (gnat_base_type)
3083 && !Is_For_Access_Subtype (gnat_entity)
3084 && Is_Constrained (gnat_entity)
3085 && Has_Discriminants (gnat_entity)
3086 && Present (Discriminant_Constraint (gnat_entity))
3087 && Stored_Constraint (gnat_entity) != No_Elist)
3090 = build_subst_list (gnat_entity, gnat_base_type, definition);
3091 tree gnu_pos_list, gnu_field_list = NULL_TREE;
3092 tree gnu_unpad_base_type, t;
3093 Entity_Id gnat_field;
3095 gnu_type = make_node (RECORD_TYPE);
3096 TYPE_NAME (gnu_type) = gnu_entity_name;
3098 /* Set the size, alignment and alias set of the new type to
3099 match that of the old one, doing required substitutions.
3100 We do it this early because we need the size of the new
3101 type below to discard old fields if necessary. */
3102 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
3103 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
3104 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
3105 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
3106 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
3108 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3109 for (t = gnu_subst_list; t; t = TREE_CHAIN (t))
3110 TYPE_SIZE (gnu_type)
3111 = substitute_in_expr (TYPE_SIZE (gnu_type),
3115 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
3116 for (t = gnu_subst_list; t; t = TREE_CHAIN (t))
3117 TYPE_SIZE_UNIT (gnu_type)
3118 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
3122 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
3123 for (t = gnu_subst_list; t; t = TREE_CHAIN (t))
3125 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3129 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
3130 && TYPE_IS_PADDING_P (gnu_base_type))
3131 gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3133 gnu_unpad_base_type = gnu_base_type;
3136 = compute_field_positions (gnu_unpad_base_type, NULL_TREE,
3137 size_zero_node, bitsize_zero_node,
3140 for (gnat_field = First_Entity (gnat_entity);
3141 Present (gnat_field);
3142 gnat_field = Next_Entity (gnat_field))
3143 if ((Ekind (gnat_field) == E_Component
3144 || Ekind (gnat_field) == E_Discriminant)
3145 && !(Present (Corresponding_Discriminant (gnat_field))
3146 && Is_Tagged_Type (gnat_base_type))
3147 && Underlying_Type (Scope (Original_Record_Component
3151 Name_Id gnat_name = Chars (gnat_field);
3152 Entity_Id gnat_old_field
3153 = Original_Record_Component (gnat_field);
3155 = gnat_to_gnu_field_decl (gnat_old_field);
3158 (purpose_member (gnu_old_field, gnu_pos_list));
3159 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3160 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3161 tree gnu_field, gnu_field_type, gnu_size, gnu_new_pos;
3162 tree gnu_last = NULL_TREE;
3163 unsigned int offset_align
3165 (TREE_PURPOSE (TREE_VALUE (gnu_offset)), 1);
3167 /* If the type is the same, retrieve the GCC type from the
3168 old field to take into account possible adjustments. */
3169 if (Etype (gnat_field) == Etype (gnat_old_field))
3170 gnu_field_type = TREE_TYPE (gnu_old_field);
3172 gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
3174 /* If there was a component clause, the field types must be
3175 the same for the type and subtype, so copy the data from
3176 the old field to avoid recomputation here. Also if the
3177 field is justified modular and the optimization in
3178 gnat_to_gnu_field was applied. */
3179 if (Present (Component_Clause (gnat_old_field))
3180 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3181 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3182 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3183 == TREE_TYPE (gnu_old_field)))
3185 gnu_size = DECL_SIZE (gnu_old_field);
3186 gnu_field_type = TREE_TYPE (gnu_old_field);
3189 /* If the old field was packed and of constant size, we
3190 have to get the old size here, as it might differ from
3191 what the Etype conveys and the latter might overlap
3192 onto the following field. Try to arrange the type for
3193 possible better packing along the way. */
3194 else if (DECL_PACKED (gnu_old_field)
3195 && TREE_CODE (DECL_SIZE (gnu_old_field))
3198 gnu_size = DECL_SIZE (gnu_old_field);
3199 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3200 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
3201 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3203 = make_packable_type (gnu_field_type, true);
3207 gnu_size = TYPE_SIZE (gnu_field_type);
3209 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3210 for (t = gnu_subst_list; t; t = TREE_CHAIN (t))
3211 gnu_pos = substitute_in_expr (gnu_pos,
3215 /* If the position is now a constant, we can set it as the
3216 position of the field when we make it. Otherwise, we
3217 need to deal with it specially below. */
3218 if (TREE_CONSTANT (gnu_pos))
3220 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3222 /* Discard old fields that are outside the new type.
3223 This avoids confusing code scanning it to decide
3224 how to pass it to functions on some platforms. */
3225 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3226 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3227 && !integer_zerop (gnu_size)
3228 && !tree_int_cst_lt (gnu_new_pos,
3229 TYPE_SIZE (gnu_type)))
3233 gnu_new_pos = NULL_TREE;
3237 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3238 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3239 !DECL_NONADDRESSABLE_P (gnu_old_field));
3241 if (!TREE_CONSTANT (gnu_pos))
3243 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3244 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3245 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3246 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3247 DECL_SIZE (gnu_field) = gnu_size;
3248 DECL_SIZE_UNIT (gnu_field)
3249 = convert (sizetype,
3250 size_binop (CEIL_DIV_EXPR, gnu_size,
3251 bitsize_unit_node));
3252 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3255 DECL_INTERNAL_P (gnu_field)
3256 = DECL_INTERNAL_P (gnu_old_field);
3257 SET_DECL_ORIGINAL_FIELD
3258 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3259 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3261 DECL_DISCRIMINANT_NUMBER (gnu_field)
3262 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3263 TREE_THIS_VOLATILE (gnu_field)
3264 = TREE_THIS_VOLATILE (gnu_old_field);
3266 /* To match the layout crafted in components_to_record,
3267 if this is the _Tag or _Parent field, put it before
3268 any other fields. */
3269 if (gnat_name == Name_uTag || gnat_name == Name_uParent)
3270 gnu_field_list = chainon (gnu_field_list, gnu_field);
3272 /* Similarly, if this is the _Controller field, put
3273 it before the other fields except for the _Tag or
3275 else if (gnat_name == Name_uController && gnu_last)
3277 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
3278 TREE_CHAIN (gnu_last) = gnu_field;
3281 /* Otherwise, if this is a regular field, put it after
3282 the other fields. */
3285 TREE_CHAIN (gnu_field) = gnu_field_list;
3286 gnu_field_list = gnu_field;
3288 gnu_last = gnu_field;
3291 save_gnu_tree (gnat_field, gnu_field, false);
3294 /* Now go through the entities again looking for Itypes that
3295 we have not elaborated but should (e.g., Etypes of fields
3296 that have Original_Components). */
3297 for (gnat_field = First_Entity (gnat_entity);
3298 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3299 if ((Ekind (gnat_field) == E_Discriminant
3300 || Ekind (gnat_field) == E_Component)
3301 && !present_gnu_tree (Etype (gnat_field)))
3302 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3304 /* Do not finalize it since we're going to modify it below. */
3305 gnu_field_list = nreverse (gnu_field_list);
3306 finish_record_type (gnu_type, gnu_field_list, 2, true);
3308 /* Finalize size and mode. */
3309 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3310 TYPE_SIZE_UNIT (gnu_type)
3311 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3313 /* See the E_Record_Type case for the rationale. */
3314 if (Is_Tagged_Type (gnat_entity)
3315 || Is_Limited_Record (gnat_entity))
3316 SET_TYPE_MODE (gnu_type, BLKmode);
3318 compute_record_mode (gnu_type);
3320 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3322 /* Fill in locations of fields. */
3323 annotate_rep (gnat_entity, gnu_type);
3325 /* We've built a new type, make an XVS type to show what this
3326 is a subtype of. Some debuggers require the XVS type to be
3327 output first, so do it in that order. */
3330 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3331 tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type);
3333 if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL)
3334 gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name);
3336 TYPE_NAME (gnu_subtype_marker)
3337 = create_concat_name (gnat_entity, "XVS");
3338 finish_record_type (gnu_subtype_marker,
3339 create_field_decl (gnu_unpad_base_name,
3340 build_reference_type
3341 (gnu_unpad_base_type),
3347 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3348 gnu_subtype_marker);
3351 /* Now we can finalize it. */
3352 rest_of_record_type_compilation (gnu_type);
3355 /* Otherwise, go down all the components in the new type and make
3356 them equivalent to those in the base type. */
3359 gnu_type = gnu_base_type;
3361 for (gnat_temp = First_Entity (gnat_entity);
3362 Present (gnat_temp);
3363 gnat_temp = Next_Entity (gnat_temp))
3364 if ((Ekind (gnat_temp) == E_Discriminant
3365 && !Is_Unchecked_Union (gnat_base_type))
3366 || Ekind (gnat_temp) == E_Component)
3367 save_gnu_tree (gnat_temp,
3368 gnat_to_gnu_field_decl
3369 (Original_Record_Component (gnat_temp)),
3375 case E_Access_Subprogram_Type:
3376 /* Use the special descriptor type for dispatch tables if needed,
3377 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3378 Note that we are only required to do so for static tables in
3379 order to be compatible with the C++ ABI, but Ada 2005 allows
3380 to extend library level tagged types at the local level so
3381 we do it in the non-static case as well. */
3382 if (TARGET_VTABLE_USES_DESCRIPTORS
3383 && Is_Dispatch_Table_Entity (gnat_entity))
3385 gnu_type = fdesc_type_node;
3386 gnu_size = TYPE_SIZE (gnu_type);
3390 /* ... fall through ... */
3392 case E_Anonymous_Access_Subprogram_Type:
3393 /* If we are not defining this entity, and we have incomplete
3394 entities being processed above us, make a dummy type and
3395 fill it in later. */
3396 if (!definition && defer_incomplete_level != 0)
3398 struct incomplete *p
3399 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3402 = build_pointer_type
3403 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3404 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3405 !Comes_From_Source (gnat_entity),
3406 debug_info_p, gnat_entity);
3407 this_made_decl = true;
3408 gnu_type = TREE_TYPE (gnu_decl);
3409 save_gnu_tree (gnat_entity, gnu_decl, false);
3412 p->old_type = TREE_TYPE (gnu_type);
3413 p->full_type = Directly_Designated_Type (gnat_entity);
3414 p->next = defer_incomplete_list;
3415 defer_incomplete_list = p;
3419 /* ... fall through ... */
3421 case E_Allocator_Type:
3423 case E_Access_Attribute_Type:
3424 case E_Anonymous_Access_Type:
3425 case E_General_Access_Type:
3427 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3428 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3429 bool is_from_limited_with
3430 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3431 && From_With_Type (gnat_desig_equiv));
3433 /* Get the "full view" of this entity. If this is an incomplete
3434 entity from a limited with, treat its non-limited view as the full
3435 view. Otherwise, if this is an incomplete or private type, use the
3436 full view. In the former case, we might point to a private type,
3437 in which case, we need its full view. Also, we want to look at the
3438 actual type used for the representation, so this takes a total of
3440 Entity_Id gnat_desig_full_direct_first
3441 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3442 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3443 ? Full_View (gnat_desig_equiv) : Empty));
3444 Entity_Id gnat_desig_full_direct
3445 = ((is_from_limited_with
3446 && Present (gnat_desig_full_direct_first)
3447 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3448 ? Full_View (gnat_desig_full_direct_first)
3449 : gnat_desig_full_direct_first);
3450 Entity_Id gnat_desig_full
3451 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3453 /* This the type actually used to represent the designated type,
3454 either gnat_desig_full or gnat_desig_equiv. */
3455 Entity_Id gnat_desig_rep;
3457 /* True if this is a pointer to an unconstrained array. */
3458 bool is_unconstrained_array;
3460 /* We want to know if we'll be seeing the freeze node for any
3461 incomplete type we may be pointing to. */
3463 = (Present (gnat_desig_full)
3464 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3465 : In_Extended_Main_Code_Unit (gnat_desig_type));
3467 /* True if we make a dummy type here. */
3468 bool got_fat_p = false;
3469 /* True if the dummy is a fat pointer. */
3470 bool made_dummy = false;
3471 tree gnu_desig_type = NULL_TREE;
3472 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3474 if (!targetm.valid_pointer_mode (p_mode))
3477 /* If either the designated type or its full view is an unconstrained
3478 array subtype, replace it with the type it's a subtype of. This
3479 avoids problems with multiple copies of unconstrained array types.
3480 Likewise, if the designated type is a subtype of an incomplete
3481 record type, use the parent type to avoid order of elaboration
3482 issues. This can lose some code efficiency, but there is no
3484 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3485 && ! Is_Constrained (gnat_desig_equiv))
3486 gnat_desig_equiv = Etype (gnat_desig_equiv);
3487 if (Present (gnat_desig_full)
3488 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3489 && ! Is_Constrained (gnat_desig_full))
3490 || (Ekind (gnat_desig_full) == E_Record_Subtype
3491 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3492 gnat_desig_full = Etype (gnat_desig_full);
3494 /* Now set the type that actually marks the representation of
3495 the designated type and also flag whether we have a unconstrained
3497 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3498 is_unconstrained_array
3499 = (Is_Array_Type (gnat_desig_rep)
3500 && ! Is_Constrained (gnat_desig_rep));
3502 /* If we are pointing to an incomplete type whose completion is an
3503 unconstrained array, make a fat pointer type. The two types in our
3504 fields will be pointers to dummy nodes and will be replaced in
3505 update_pointer_to. Similarly, if the type itself is a dummy type or
3506 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3507 in case we have any thin pointers to it. */
3508 if (is_unconstrained_array
3509 && (Present (gnat_desig_full)
3510 || (present_gnu_tree (gnat_desig_equiv)
3511 && TYPE_IS_DUMMY_P (TREE_TYPE
3512 (get_gnu_tree (gnat_desig_equiv))))
3513 || (No (gnat_desig_full) && ! in_main_unit
3514 && defer_incomplete_level != 0
3515 && ! present_gnu_tree (gnat_desig_equiv))
3516 || (in_main_unit && is_from_limited_with
3517 && Present (Freeze_Node (gnat_desig_rep)))))
3521 if (present_gnu_tree (gnat_desig_rep))
3522 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3525 gnu_old = make_dummy_type (gnat_desig_rep);
3527 /* Show the dummy we get will be a fat pointer. */
3528 got_fat_p = made_dummy = true;
3531 /* If the call above got something that has a pointer, that
3532 pointer is our type. This could have happened either
3533 because the type was elaborated or because somebody
3534 else executed the code below. */
3535 gnu_type = TYPE_POINTER_TO (gnu_old);
3538 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3539 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3540 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3541 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3544 TYPE_NAME (gnu_template_type)
3545 = create_concat_name (gnat_desig_equiv, "XUB");
3546 TYPE_DUMMY_P (gnu_template_type) = 1;
3548 TYPE_NAME (gnu_array_type)
3549 = create_concat_name (gnat_desig_equiv, "XUA");
3550 TYPE_DUMMY_P (gnu_array_type) = 1;
3552 gnu_type = make_node (RECORD_TYPE);
3553 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3554 TYPE_POINTER_TO (gnu_old) = gnu_type;
3556 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3558 = chainon (chainon (NULL_TREE,
3560 (get_identifier ("P_ARRAY"),
3562 gnu_type, 0, 0, 0, 0)),
3563 create_field_decl (get_identifier ("P_BOUNDS"),
3565 gnu_type, 0, 0, 0, 0));
3567 /* Make sure we can place this into a register. */
3568 TYPE_ALIGN (gnu_type)
3569 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3570 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3572 /* Do not finalize this record type since the types of
3573 its fields are incomplete. */
3574 finish_record_type (gnu_type, fields, 0, true);
3576 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3577 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3578 = create_concat_name (gnat_desig_equiv, "XUT");
3579 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3583 /* If we already know what the full type is, use it. */
3584 else if (Present (gnat_desig_full)
3585 && present_gnu_tree (gnat_desig_full))
3586 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3588 /* Get the type of the thing we are to point to and build a pointer
3589 to it. If it is a reference to an incomplete or private type with a
3590 full view that is a record, make a dummy type node and get the
3591 actual type later when we have verified it is safe. */
3592 else if ((! in_main_unit
3593 && ! present_gnu_tree (gnat_desig_equiv)
3594 && Present (gnat_desig_full)
3595 && ! present_gnu_tree (gnat_desig_full)
3596 && Is_Record_Type (gnat_desig_full))
3597 /* Likewise if we are pointing to a record or array and we
3598 are to defer elaborating incomplete types. We do this
3599 since this access type may be the full view of some
3600 private type. Note that the unconstrained array case is
3602 || ((! in_main_unit || imported_p)
3603 && defer_incomplete_level != 0
3604 && ! present_gnu_tree (gnat_desig_equiv)
3605 && ((Is_Record_Type (gnat_desig_rep)
3606 || Is_Array_Type (gnat_desig_rep))))
3607 /* If this is a reference from a limited_with type back to our
3608 main unit and there's a Freeze_Node for it, either we have
3609 already processed the declaration and made the dummy type,
3610 in which case we just reuse the latter, or we have not yet,
3611 in which case we make the dummy type and it will be reused
3612 when the declaration is processed. In both cases, the
3613 pointer eventually created below will be automatically
3614 adjusted when the Freeze_Node is processed. Note that the
3615 unconstrained array case is handled above. */
3616 || (in_main_unit && is_from_limited_with
3617 && Present (Freeze_Node (gnat_desig_rep))))
3619 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3623 /* Otherwise handle the case of a pointer to itself. */
3624 else if (gnat_desig_equiv == gnat_entity)
3627 = build_pointer_type_for_mode (void_type_node, p_mode,
3628 No_Strict_Aliasing (gnat_entity));
3629 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3632 /* If expansion is disabled, the equivalent type of a concurrent
3633 type is absent, so build a dummy pointer type. */
3634 else if (type_annotate_only && No (gnat_desig_equiv))
3635 gnu_type = ptr_void_type_node;
3637 /* Finally, handle the straightforward case where we can just
3638 elaborate our designated type and point to it. */
3640 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3642 /* It is possible that a call to gnat_to_gnu_type above resolved our
3643 type. If so, just return it. */
3644 if (present_gnu_tree (gnat_entity))
3646 maybe_present = true;
3650 /* If we have a GCC type for the designated type, possibly modify it
3651 if we are pointing only to constant objects and then make a pointer
3652 to it. Don't do this for unconstrained arrays. */
3653 if (!gnu_type && gnu_desig_type)
3655 if (Is_Access_Constant (gnat_entity)
3656 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3659 = build_qualified_type
3661 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3663 /* Some extra processing is required if we are building a
3664 pointer to an incomplete type (in the GCC sense). We might
3665 have such a type if we just made a dummy, or directly out
3666 of the call to gnat_to_gnu_type above if we are processing
3667 an access type for a record component designating the
3668 record type itself. */
3669 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3671 /* We must ensure that the pointer to variant we make will
3672 be processed by update_pointer_to when the initial type
3673 is completed. Pretend we made a dummy and let further
3674 processing act as usual. */
3677 /* We must ensure that update_pointer_to will not retrieve
3678 the dummy variant when building a properly qualified
3679 version of the complete type. We take advantage of the
3680 fact that get_qualified_type is requiring TYPE_NAMEs to
3681 match to influence build_qualified_type and then also
3682 update_pointer_to here. */
3683 TYPE_NAME (gnu_desig_type)
3684 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3689 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3690 No_Strict_Aliasing (gnat_entity));
3693 /* If we are not defining this object and we made a dummy pointer,
3694 save our current definition, evaluate the actual type, and replace
3695 the tentative type we made with the actual one. If we are to defer
3696 actually looking up the actual type, make an entry in the
3697 deferred list. If this is from a limited with, we have to defer
3698 to the end of the current spec in two cases: first if the
3699 designated type is in the current unit and second if the access
3701 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3704 = TYPE_FAT_POINTER_P (gnu_type)
3705 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3707 if (esize == POINTER_SIZE
3708 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3710 = build_pointer_type
3711 (TYPE_OBJECT_RECORD_TYPE
3712 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3714 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3715 !Comes_From_Source (gnat_entity),
3716 debug_info_p, gnat_entity);
3717 this_made_decl = true;
3718 gnu_type = TREE_TYPE (gnu_decl);
3719 save_gnu_tree (gnat_entity, gnu_decl, false);
3722 if (defer_incomplete_level == 0
3723 && ! (is_from_limited_with
3725 || In_Extended_Main_Code_Unit (gnat_entity))))
3726 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3727 gnat_to_gnu_type (gnat_desig_equiv));
3729 /* Note that the call to gnat_to_gnu_type here might have
3730 updated gnu_old_type directly, in which case it is not a
3731 dummy type any more when we get into update_pointer_to.
3733 This may happen for instance when the designated type is a
3734 record type, because their elaboration starts with an
3735 initial node from make_dummy_type, which may yield the same
3736 node as the one we got.
3738 Besides, variants of this non-dummy type might have been
3739 created along the way. update_pointer_to is expected to
3740 properly take care of those situations. */
3743 struct incomplete *p
3744 = (struct incomplete *) xmalloc (sizeof
3745 (struct incomplete));
3746 struct incomplete **head
3747 = (is_from_limited_with
3749 || In_Extended_Main_Code_Unit (gnat_entity))
3750 ? &defer_limited_with : &defer_incomplete_list);
3752 p->old_type = gnu_old_type;
3753 p->full_type = gnat_desig_equiv;
3761 case E_Access_Protected_Subprogram_Type:
3762 case E_Anonymous_Access_Protected_Subprogram_Type:
3763 if (type_annotate_only && No (gnat_equiv_type))
3764 gnu_type = ptr_void_type_node;
3767 /* The runtime representation is the equivalent type. */
3768 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3769 maybe_present = true;
3772 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3773 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3774 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3775 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3776 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3781 case E_Access_Subtype:
3783 /* We treat this as identical to its base type; any constraint is
3784 meaningful only to the front end.
3786 The designated type must be elaborated as well, if it does
3787 not have its own freeze node. Designated (sub)types created
3788 for constrained components of records with discriminants are
3789 not frozen by the front end and thus not elaborated by gigi,
3790 because their use may appear before the base type is frozen,
3791 and because it is not clear that they are needed anywhere in
3792 Gigi. With the current model, there is no correct place where
3793 they could be elaborated. */
3795 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3796 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3797 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3798 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3799 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3801 /* If we are not defining this entity, and we have incomplete
3802 entities being processed above us, make a dummy type and
3803 elaborate it later. */
3804 if (!definition && defer_incomplete_level != 0)
3806 struct incomplete *p
3807 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3809 = build_pointer_type
3810 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3812 p->old_type = TREE_TYPE (gnu_ptr_type);
3813 p->full_type = Directly_Designated_Type (gnat_entity);
3814 p->next = defer_incomplete_list;
3815 defer_incomplete_list = p;
3817 else if (!IN (Ekind (Base_Type
3818 (Directly_Designated_Type (gnat_entity))),
3819 Incomplete_Or_Private_Kind))
3820 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3824 maybe_present = true;
3827 /* Subprogram Entities
3829 The following access functions are defined for subprograms (functions
3832 First_Formal The first formal parameter.
3833 Is_Imported Indicates that the subprogram has appeared in
3834 an INTERFACE or IMPORT pragma. For now we
3835 assume that the external language is C.
3836 Is_Exported Likewise but for an EXPORT pragma.
3837 Is_Inlined True if the subprogram is to be inlined.
3839 In addition for function subprograms we have:
3841 Etype Return type of the function.
3843 Each parameter is first checked by calling must_pass_by_ref on its
3844 type to determine if it is passed by reference. For parameters which
3845 are copied in, if they are Ada In Out or Out parameters, their return
3846 value becomes part of a record which becomes the return type of the
3847 function (C function - note that this applies only to Ada procedures
3848 so there is no Ada return type). Additional code to store back the
3849 parameters will be generated on the caller side. This transformation
3850 is done here, not in the front-end.
3852 The intended result of the transformation can be seen from the
3853 equivalent source rewritings that follow:
3855 struct temp {int a,b};
3856 procedure P (A,B: In Out ...) is temp P (int A,B)
3859 end P; return {A,B};
3866 For subprogram types we need to perform mainly the same conversions to
3867 GCC form that are needed for procedures and function declarations. The
3868 only difference is that at the end, we make a type declaration instead
3869 of a function declaration. */
3871 case E_Subprogram_Type:
3875 /* The first GCC parameter declaration (a PARM_DECL node). The
3876 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3877 actually is the head of this parameter list. */
3878 tree gnu_param_list = NULL_TREE;
3879 /* Likewise for the stub associated with an exported procedure. */
3880 tree gnu_stub_param_list = NULL_TREE;
3881 /* The type returned by a function. If the subprogram is a procedure
3882 this type should be void_type_node. */
3883 tree gnu_return_type = void_type_node;
3884 /* List of fields in return type of procedure with copy-in copy-out
3886 tree gnu_field_list = NULL_TREE;
3887 /* Non-null for subprograms containing parameters passed by copy-in
3888 copy-out (Ada In Out or Out parameters not passed by reference),
3889 in which case it is the list of nodes used to specify the values of
3890 the in out/out parameters that are returned as a record upon
3891 procedure return. The TREE_PURPOSE of an element of this list is
3892 a field of the record and the TREE_VALUE is the PARM_DECL
3893 corresponding to that field. This list will be saved in the
3894 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3895 tree gnu_return_list = NULL_TREE;
3896 /* If an import pragma asks to map this subprogram to a GCC builtin,
3897 this is the builtin DECL node. */
3898 tree gnu_builtin_decl = NULL_TREE;
3899 /* For the stub associated with an exported procedure. */
3900 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3901 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3902 Entity_Id gnat_param;
3903 bool inline_flag = Is_Inlined (gnat_entity);
3904 bool public_flag = Is_Public (gnat_entity) || imported_p;
3906 = (Is_Public (gnat_entity) && !definition) || imported_p;
3908 /* The semantics of "pure" in Ada essentially matches that of "const"
3909 in the back-end. In particular, both properties are orthogonal to
3910 the "nothrow" property if the EH circuitry is explicit in the
3911 internal representation of the back-end. If we are to completely
3912 hide the EH circuitry from it, we need to declare that calls to pure
3913 Ada subprograms that can throw have side effects since they can
3914 trigger an "abnormal" transfer of control flow; thus they can be
3915 neither "const" nor "pure" in the back-end sense. */
3917 = (Exception_Mechanism == Back_End_Exceptions
3918 && Is_Pure (gnat_entity));
3920 bool volatile_flag = No_Return (gnat_entity);
3921 bool returns_by_ref = false;
3922 bool returns_unconstrained = false;
3923 bool returns_by_target_ptr = false;
3924 bool has_copy_in_out = false;
3925 bool has_stub = false;
3928 /* A parameter may refer to this type, so defer completion of any
3929 incomplete types. */
3930 if (kind == E_Subprogram_Type && !definition)
3932 defer_incomplete_level++;
3933 this_deferred = true;
3936 /* If the subprogram has an alias, it is probably inherited, so
3937 we can use the original one. If the original "subprogram"
3938 is actually an enumeration literal, it may be the first use
3939 of its type, so we must elaborate that type now. */
3940 if (Present (Alias (gnat_entity)))
3942 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3943 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3945 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3948 /* Elaborate any Itypes in the parameters of this entity. */
3949 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3950 Present (gnat_temp);
3951 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3952 if (Is_Itype (Etype (gnat_temp)))
3953 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3958 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3959 corresponding DECL node.
3961 We still want the parameter associations to take place because the
3962 proper generation of calls depends on it (a GNAT parameter without
3963 a corresponding GCC tree has a very specific meaning), so we don't
3965 if (Convention (gnat_entity) == Convention_Intrinsic)
3966 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3968 /* ??? What if we don't find the builtin node above ? warn ? err ?
3969 In the current state we neither warn nor err, and calls will just
3970 be handled as for regular subprograms. */
3972 if (kind == E_Function || kind == E_Subprogram_Type)
3973 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3975 /* If this function returns by reference, make the actual
3976 return type of this function the pointer and mark the decl. */
3977 if (Returns_By_Ref (gnat_entity))
3979 returns_by_ref = true;
3980 gnu_return_type = build_pointer_type (gnu_return_type);
3983 /* If the Mechanism is By_Reference, ensure the return type uses
3984 the machine's by-reference mechanism, which may not the same
3985 as above (e.g., it might be by passing a fake parameter). */
3986 else if (kind == E_Function
3987 && Mechanism (gnat_entity) == By_Reference)
3989 TREE_ADDRESSABLE (gnu_return_type) = 1;
3991 /* We expect this bit to be reset by gigi shortly, so can avoid a
3992 type node copy here. This actually also prevents troubles with
3993 the generation of debug information for the function, because
3994 we might have issued such info for this type already, and would
3995 be attaching a distinct type node to the function if we made a
3999 /* If we are supposed to return an unconstrained array,
4000 actually return a fat pointer and make a note of that. Return
4001 a pointer to an unconstrained record of variable size. */
4002 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
4004 gnu_return_type = TREE_TYPE (gnu_return_type);
4005 returns_unconstrained = true;
4008 /* If the type requires a transient scope, the result is allocated
4009 on the secondary stack, so the result type of the function is
4011 else if (Requires_Transient_Scope (Etype (gnat_entity)))
4013 gnu_return_type = build_pointer_type (gnu_return_type);
4014 returns_unconstrained = true;
4017 /* If the type is a padded type and the underlying type would not
4018 be passed by reference or this function has a foreign convention,
4019 return the underlying type. */
4020 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
4021 && TYPE_IS_PADDING_P (gnu_return_type)
4022 && (!default_pass_by_ref (TREE_TYPE
4023 (TYPE_FIELDS (gnu_return_type)))
4024 || Has_Foreign_Convention (gnat_entity)))
4025 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
4027 /* If the return type has a non-constant size, we convert the function
4028 into a procedure and its caller will pass a pointer to an object as
4029 the first parameter when we call the function. This can happen for
4030 an unconstrained type with a maximum size or a constrained type with
4031 a size not known at compile time. */
4032 if (TYPE_SIZE_UNIT (gnu_return_type)
4033 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
4035 returns_by_target_ptr = true;
4037 = create_param_decl (get_identifier ("TARGET"),
4038 build_reference_type (gnu_return_type),
4040 gnu_return_type = void_type_node;
4043 /* If the return type has a size that overflows, we cannot have
4044 a function that returns that type. This usage doesn't make
4045 sense anyway, so give an error here. */
4046 if (TYPE_SIZE_UNIT (gnu_return_type)
4047 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
4048 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
4050 post_error ("cannot return type whose size overflows",
4052 gnu_return_type = copy_node (gnu_return_type);
4053 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
4054 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
4055 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
4056 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
4059 /* Look at all our parameters and get the type of
4060 each. While doing this, build a copy-out structure if
4063 /* Loop over the parameters and get their associated GCC tree.
4064 While doing this, build a copy-out structure if we need one. */
4065 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
4066 Present (gnat_param);
4067 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
4069 tree gnu_param_name = get_entity_name (gnat_param);
4070 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4071 tree gnu_param, gnu_field;
4072 bool copy_in_copy_out = false;
4073 Mechanism_Type mech = Mechanism (gnat_param);
4075 /* Builtins are expanded inline and there is no real call sequence
4076 involved. So the type expected by the underlying expander is
4077 always the type of each argument "as is". */
4078 if (gnu_builtin_decl)
4080 /* Handle the first parameter of a valued procedure specially. */
4081 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
4082 mech = By_Copy_Return;
4083 /* Otherwise, see if a Mechanism was supplied that forced this
4084 parameter to be passed one way or another. */
4085 else if (mech == Default
4086 || mech == By_Copy || mech == By_Reference)
4088 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4089 mech = By_Descriptor;
4091 else if (By_Short_Descriptor_Last <= mech &&
4092 mech <= By_Short_Descriptor)
4093 mech = By_Short_Descriptor;
4097 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4098 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4099 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4101 mech = By_Reference;
4107 post_error ("unsupported mechanism for&", gnat_param);
4112 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4113 Has_Foreign_Convention (gnat_entity),
4116 /* We are returned either a PARM_DECL or a type if no parameter
4117 needs to be passed; in either case, adjust the type. */
4118 if (DECL_P (gnu_param))
4119 gnu_param_type = TREE_TYPE (gnu_param);
4122 gnu_param_type = gnu_param;
4123 gnu_param = NULL_TREE;
4128 /* If it's an exported subprogram, we build a parameter list
4129 in parallel, in case we need to emit a stub for it. */
4130 if (Is_Exported (gnat_entity))
4133 = chainon (gnu_param, gnu_stub_param_list);
4134 /* Change By_Descriptor parameter to By_Reference for
4135 the internal version of an exported subprogram. */
4136 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4139 = gnat_to_gnu_param (gnat_param, By_Reference,
4145 gnu_param = copy_node (gnu_param);
4148 gnu_param_list = chainon (gnu_param, gnu_param_list);
4149 Sloc_to_locus (Sloc (gnat_param),
4150 &DECL_SOURCE_LOCATION (gnu_param));
4151 save_gnu_tree (gnat_param, gnu_param, false);
4153 /* If a parameter is a pointer, this function may modify
4154 memory through it and thus shouldn't be considered
4155 a const function. Also, the memory may be modified
4156 between two calls, so they can't be CSE'ed. The latter
4157 case also handles by-ref parameters. */
4158 if (POINTER_TYPE_P (gnu_param_type)
4159 || TYPE_FAT_POINTER_P (gnu_param_type))
4163 if (copy_in_copy_out)
4165 if (!has_copy_in_out)
4167 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4168 gnu_return_type = make_node (RECORD_TYPE);
4169 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4170 has_copy_in_out = true;
4173 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4174 gnu_return_type, 0, 0, 0, 0);
4175 Sloc_to_locus (Sloc (gnat_param),
4176 &DECL_SOURCE_LOCATION (gnu_field));
4177 TREE_CHAIN (gnu_field) = gnu_field_list;
4178 gnu_field_list = gnu_field;
4179 gnu_return_list = tree_cons (gnu_field, gnu_param,
4184 /* Do not compute record for out parameters if subprogram is
4185 stubbed since structures are incomplete for the back-end. */
4186 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4187 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4190 /* If we have a CICO list but it has only one entry, we convert
4191 this function into a function that simply returns that one
4193 if (list_length (gnu_return_list) == 1)
4194 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
4196 if (Has_Stdcall_Convention (gnat_entity))
4197 prepend_one_attribute_to
4198 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4199 get_identifier ("stdcall"), NULL_TREE,
4202 /* If we are on a target where stack realignment is needed for 'main'
4203 to honor GCC's implicit expectations (stack alignment greater than
4204 what the base ABI guarantees), ensure we do the same for foreign
4205 convention subprograms as they might be used as callbacks from code
4206 breaking such expectations. Note that this applies to task entry
4207 points in particular. */
4208 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4209 && Has_Foreign_Convention (gnat_entity))
4210 prepend_one_attribute_to
4211 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4212 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4215 /* The lists have been built in reverse. */
4216 gnu_param_list = nreverse (gnu_param_list);
4218 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4219 gnu_return_list = nreverse (gnu_return_list);
4221 if (Ekind (gnat_entity) == E_Function)
4222 Set_Mechanism (gnat_entity,
4223 (returns_by_ref || returns_unconstrained
4224 ? By_Reference : By_Copy));
4226 = create_subprog_type (gnu_return_type, gnu_param_list,
4227 gnu_return_list, returns_unconstrained,
4228 returns_by_ref, returns_by_target_ptr);
4232 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4233 gnu_return_list, returns_unconstrained,
4234 returns_by_ref, returns_by_target_ptr);
4236 /* A subprogram (something that doesn't return anything) shouldn't
4237 be considered const since there would be no reason for such a
4238 subprogram. Note that procedures with Out (or In Out) parameters
4239 have already been converted into a function with a return type. */
4240 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4244 = build_qualified_type (gnu_type,
4245 TYPE_QUALS (gnu_type)
4246 | (TYPE_QUAL_CONST * const_flag)
4247 | (TYPE_QUAL_VOLATILE * volatile_flag));
4249 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4253 = build_qualified_type (gnu_stub_type,
4254 TYPE_QUALS (gnu_stub_type)
4255 | (TYPE_QUAL_CONST * const_flag)
4256 | (TYPE_QUAL_VOLATILE * volatile_flag));
4258 /* If we have a builtin decl for that function, check the signatures
4259 compatibilities. If the signatures are compatible, use the builtin
4260 decl. If they are not, we expect the checker predicate to have
4261 posted the appropriate errors, and just continue with what we have
4263 if (gnu_builtin_decl)
4265 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4267 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4269 gnu_decl = gnu_builtin_decl;
4270 gnu_type = gnu_builtin_type;
4275 /* If there was no specified Interface_Name and the external and
4276 internal names of the subprogram are the same, only use the
4277 internal name to allow disambiguation of nested subprograms. */
4278 if (No (Interface_Name (gnat_entity))
4279 && gnu_ext_name == gnu_entity_name)
4280 gnu_ext_name = NULL_TREE;
4282 /* If we are defining the subprogram and it has an Address clause
4283 we must get the address expression from the saved GCC tree for the
4284 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4285 the address expression here since the front-end has guaranteed
4286 in that case that the elaboration has no effects. If there is
4287 an Address clause and we are not defining the object, just
4288 make it a constant. */
4289 if (Present (Address_Clause (gnat_entity)))
4291 tree gnu_address = NULL_TREE;
4295 = (present_gnu_tree (gnat_entity)
4296 ? get_gnu_tree (gnat_entity)
4297 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4299 save_gnu_tree (gnat_entity, NULL_TREE, false);
4301 /* Convert the type of the object to a reference type that can
4302 alias everything as per 13.3(19). */
4304 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4306 gnu_address = convert (gnu_type, gnu_address);
4309 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4310 gnu_address, false, Is_Public (gnat_entity),
4311 extern_flag, false, NULL, gnat_entity);
4312 DECL_BY_REF_P (gnu_decl) = 1;
4315 else if (kind == E_Subprogram_Type)
4316 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4317 !Comes_From_Source (gnat_entity),
4318 debug_info_p, gnat_entity);
4323 gnu_stub_name = gnu_ext_name;
4324 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4325 public_flag = false;
4328 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4329 gnu_type, gnu_param_list,
4330 inline_flag, public_flag,
4331 extern_flag, attr_list,
4336 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4337 gnu_stub_type, gnu_stub_param_list,
4339 extern_flag, attr_list,
4341 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4344 /* This is unrelated to the stub built right above. */
4345 DECL_STUBBED_P (gnu_decl)
4346 = Convention (gnat_entity) == Convention_Stubbed;
4351 case E_Incomplete_Type:
4352 case E_Incomplete_Subtype:
4353 case E_Private_Type:
4354 case E_Private_Subtype:
4355 case E_Limited_Private_Type:
4356 case E_Limited_Private_Subtype:
4357 case E_Record_Type_With_Private:
4358 case E_Record_Subtype_With_Private:
4360 /* Get the "full view" of this entity. If this is an incomplete
4361 entity from a limited with, treat its non-limited view as the
4362 full view. Otherwise, use either the full view or the underlying
4363 full view, whichever is present. This is used in all the tests
4366 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4367 && From_With_Type (gnat_entity))
4368 ? Non_Limited_View (gnat_entity)
4369 : Present (Full_View (gnat_entity))
4370 ? Full_View (gnat_entity)
4371 : Underlying_Full_View (gnat_entity);
4373 /* If this is an incomplete type with no full view, it must be a Taft
4374 Amendment type, in which case we return a dummy type. Otherwise,
4375 just get the type from its Etype. */
4378 if (kind == E_Incomplete_Type)
4380 gnu_type = make_dummy_type (gnat_entity);
4381 gnu_decl = TYPE_STUB_DECL (gnu_type);
4385 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4387 maybe_present = true;
4392 /* If we already made a type for the full view, reuse it. */
4393 else if (present_gnu_tree (full_view))
4395 gnu_decl = get_gnu_tree (full_view);
4399 /* Otherwise, if we are not defining the type now, get the type
4400 from the full view. But always get the type from the full view
4401 for define on use types, since otherwise we won't see them! */
4402 else if (!definition
4403 || (Is_Itype (full_view)
4404 && No (Freeze_Node (gnat_entity)))
4405 || (Is_Itype (gnat_entity)
4406 && No (Freeze_Node (full_view))))
4408 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4409 maybe_present = true;
4413 /* For incomplete types, make a dummy type entry which will be
4414 replaced later. Save it as the full declaration's type so
4415 we can do any needed updates when we see it. */
4416 gnu_type = make_dummy_type (gnat_entity);
4417 gnu_decl = TYPE_STUB_DECL (gnu_type);
4418 save_gnu_tree (full_view, gnu_decl, 0);
4422 /* Simple class_wide types are always viewed as their root_type
4423 by Gigi unless an Equivalent_Type is specified. */
4424 case E_Class_Wide_Type:
4425 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4426 maybe_present = true;
4430 case E_Task_Subtype:
4431 case E_Protected_Type:
4432 case E_Protected_Subtype:
4433 if (type_annotate_only && No (gnat_equiv_type))
4434 gnu_type = void_type_node;
4436 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4438 maybe_present = true;
4442 gnu_decl = create_label_decl (gnu_entity_name);
4447 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4448 we've already saved it, so we don't try to. */
4449 gnu_decl = error_mark_node;
4457 /* If we had a case where we evaluated another type and it might have
4458 defined this one, handle it here. */
4459 if (maybe_present && present_gnu_tree (gnat_entity))
4461 gnu_decl = get_gnu_tree (gnat_entity);
4465 /* If we are processing a type and there is either no decl for it or
4466 we just made one, do some common processing for the type, such as
4467 handling alignment and possible padding. */
4468 if (is_type && (!gnu_decl || this_made_decl))
4470 if (Is_Tagged_Type (gnat_entity)
4471 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4472 TYPE_ALIGN_OK (gnu_type) = 1;
4474 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4475 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4477 /* ??? Don't set the size for a String_Literal since it is either
4478 confirming or we don't handle it properly (if the low bound is
4480 if (!gnu_size && kind != E_String_Literal_Subtype)
4481 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4483 Has_Size_Clause (gnat_entity));
4485 /* If a size was specified, see if we can make a new type of that size
4486 by rearranging the type, for example from a fat to a thin pointer. */
4490 = make_type_from_size (gnu_type, gnu_size,
4491 Has_Biased_Representation (gnat_entity));
4493 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4494 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4498 /* If the alignment hasn't already been processed and this is
4499 not an unconstrained array, see if an alignment is specified.
4500 If not, we pick a default alignment for atomic objects. */
4501 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4503 else if (Known_Alignment (gnat_entity))
4505 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4506 TYPE_ALIGN (gnu_type));
4508 /* Warn on suspiciously large alignments. This should catch
4509 errors about the (alignment,byte)/(size,bit) discrepancy. */
4510 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4514 /* If a size was specified, take it into account. Otherwise
4515 use the RM size for records as the type size has already
4516 been adjusted to the alignment. */
4519 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4520 || TREE_CODE (gnu_type) == UNION_TYPE
4521 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4522 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4523 size = rm_size (gnu_type);
4525 size = TYPE_SIZE (gnu_type);
4527 /* Consider an alignment as suspicious if the alignment/size
4528 ratio is greater or equal to the byte/bit ratio. */
4529 if (host_integerp (size, 1)
4530 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4531 post_error_ne ("?suspiciously large alignment specified for&",
4532 Expression (Alignment_Clause (gnat_entity)),
4536 else if (Is_Atomic (gnat_entity) && !gnu_size
4537 && host_integerp (TYPE_SIZE (gnu_type), 1)
4538 && integer_pow2p (TYPE_SIZE (gnu_type)))
4539 align = MIN (BIGGEST_ALIGNMENT,
4540 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4541 else if (Is_Atomic (gnat_entity) && gnu_size
4542 && host_integerp (gnu_size, 1)
4543 && integer_pow2p (gnu_size))
4544 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4546 /* See if we need to pad the type. If we did, and made a record,
4547 the name of the new type may be changed. So get it back for
4548 us when we make the new TYPE_DECL below. */
4549 if (gnu_size || align > 0)
4550 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4551 "PAD", true, definition, false);
4553 if (TREE_CODE (gnu_type) == RECORD_TYPE
4554 && TYPE_IS_PADDING_P (gnu_type))
4556 gnu_entity_name = TYPE_NAME (gnu_type);
4557 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4558 gnu_entity_name = DECL_NAME (gnu_entity_name);
4561 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4563 /* If we are at global level, GCC will have applied variable_size to
4564 the type, but that won't have done anything. So, if it's not
4565 a constant or self-referential, call elaborate_expression_1 to
4566 make a variable for the size rather than calculating it each time.
4567 Handle both the RM size and the actual size. */
4568 if (global_bindings_p ()
4569 && TYPE_SIZE (gnu_type)
4570 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4571 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4573 if (TREE_CODE (gnu_type) == RECORD_TYPE
4574 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4575 TYPE_SIZE (gnu_type), 0))
4577 TYPE_SIZE (gnu_type)
4578 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4579 gnat_entity, get_identifier ("SIZE"),
4581 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4585 TYPE_SIZE (gnu_type)
4586 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4587 gnat_entity, get_identifier ("SIZE"),
4590 /* ??? For now, store the size as a multiple of the alignment
4591 in bytes so that we can see the alignment from the tree. */
4592 TYPE_SIZE_UNIT (gnu_type)
4594 (MULT_EXPR, sizetype,
4595 elaborate_expression_1
4596 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4597 TYPE_SIZE_UNIT (gnu_type),
4598 size_int (TYPE_ALIGN (gnu_type)
4600 gnat_entity, get_identifier ("SIZE_A_UNIT"),
4602 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4604 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4607 elaborate_expression_1 (TYPE_ADA_SIZE (gnu_type),
4609 get_identifier ("RM_SIZE"),
4610 definition, false));
4614 /* If this is a record type or subtype, call elaborate_expression_1 on
4615 any field position. Do this for both global and local types.
4616 Skip any fields that we haven't made trees for to avoid problems with
4617 class wide types. */
4618 if (IN (kind, Record_Kind))
4619 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4620 gnat_temp = Next_Entity (gnat_temp))
4621 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4623 tree gnu_field = get_gnu_tree (gnat_temp);
4625 /* ??? Unfortunately, GCC needs to be able to prove the
4626 alignment of this offset and if it's a variable, it can't.
4627 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4628 right now, we have to put in an explicit multiply and
4629 divide by that value. */
4630 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4632 DECL_FIELD_OFFSET (gnu_field)
4634 (MULT_EXPR, sizetype,
4635 elaborate_expression_1
4636 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4637 DECL_FIELD_OFFSET (gnu_field),
4638 size_int (DECL_OFFSET_ALIGN (gnu_field)
4640 gnat_temp, get_identifier ("OFFSET"),
4642 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4644 /* ??? The context of gnu_field is not necessarily gnu_type so
4645 the MULT_EXPR node built above may not be marked by the call
4646 to create_type_decl below. */
4647 if (global_bindings_p ())
4648 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4652 gnu_type = build_qualified_type (gnu_type,
4653 (TYPE_QUALS (gnu_type)
4654 | (TYPE_QUAL_VOLATILE
4655 * Treat_As_Volatile (gnat_entity))));
4657 if (Is_Atomic (gnat_entity))
4658 check_ok_for_atomic (gnu_type, gnat_entity, false);
4660 if (Present (Alignment_Clause (gnat_entity)))
4661 TYPE_USER_ALIGN (gnu_type) = 1;
4663 if (Universal_Aliasing (gnat_entity))
4664 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4667 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4668 !Comes_From_Source (gnat_entity),
4669 debug_info_p, gnat_entity);
4671 TREE_TYPE (gnu_decl) = gnu_type;
4674 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4676 gnu_type = TREE_TYPE (gnu_decl);
4678 /* If this is a derived type, relate its alias set to that of its parent
4679 to avoid troubles when a call to an inherited primitive is inlined in
4680 a context where a derived object is accessed. The inlined code works
4681 on the parent view so the resulting code may access the same object
4682 using both the parent and the derived alias sets, which thus have to
4683 conflict. As the same issue arises with component references, the
4684 parent alias set also has to conflict with composite types enclosing
4685 derived components. For instance, if we have:
4692 we want T to conflict with both D and R, in addition to R being a
4693 superset of D by record/component construction.
4695 One way to achieve this is to perform an alias set copy from the
4696 parent to the derived type. This is not quite appropriate, though,
4697 as we don't want separate derived types to conflict with each other:
4699 type I1 is new Integer;
4700 type I2 is new Integer;
4702 We want I1 and I2 to both conflict with Integer but we do not want
4703 I1 to conflict with I2, and an alias set copy on derivation would
4706 The option chosen is to make the alias set of the derived type a
4707 superset of that of its parent type. It trivially fulfills the
4708 simple requirement for the Integer derivation example above, and
4709 the component case as well by superset transitivity:
4712 R ----------> D ----------> T
4714 The language rules ensure the parent type is already frozen here. */
4715 if (Is_Derived_Type (gnat_entity))
4717 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4718 relate_alias_sets (gnu_type, gnu_parent_type, ALIAS_SET_SUPERSET);
4721 /* Back-annotate the Alignment of the type if not already in the
4722 tree. Likewise for sizes. */
4723 if (Unknown_Alignment (gnat_entity))
4725 unsigned int double_align, align;
4726 bool is_capped_double, align_clause;
4728 /* If the default alignment of "double" or larger scalar types is
4729 specifically capped and this is not an array with an alignment
4730 clause on the component type, return the cap. */
4731 if ((double_align = double_float_alignment) > 0)
4733 = is_double_float_or_array (gnat_entity, &align_clause);
4734 else if ((double_align = double_scalar_alignment) > 0)
4736 = is_double_scalar_or_array (gnat_entity, &align_clause);
4738 is_capped_double = align_clause = false;
4740 if (is_capped_double && !align_clause)
4741 align = double_align;
4743 align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
4745 Set_Alignment (gnat_entity, UI_From_Int (align));
4748 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4750 /* If the size is self-referential, we annotate the maximum
4751 value of that size. */
4752 tree gnu_size = TYPE_SIZE (gnu_type);
4754 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4755 gnu_size = max_size (gnu_size, true);
4757 Set_Esize (gnat_entity, annotate_value (gnu_size));
4759 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4761 /* In this mode the tag and the parent components are not
4762 generated by the front-end, so the sizes must be adjusted
4764 int size_offset, new_size;
4766 if (Is_Derived_Type (gnat_entity))
4769 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4770 Set_Alignment (gnat_entity,
4771 Alignment (Etype (Base_Type (gnat_entity))));
4774 size_offset = POINTER_SIZE;
4776 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4777 Set_Esize (gnat_entity,
4778 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4779 / POINTER_SIZE) * POINTER_SIZE));
4780 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4784 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4785 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4788 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4789 DECL_ARTIFICIAL (gnu_decl) = 1;
4791 if (!debug_info_p && DECL_P (gnu_decl)
4792 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4793 && No (Renamed_Object (gnat_entity)))
4794 DECL_IGNORED_P (gnu_decl) = 1;
4796 /* If we haven't already, associate the ..._DECL node that we just made with
4797 the input GNAT entity node. */
4799 save_gnu_tree (gnat_entity, gnu_decl, false);
4801 /* If this is an enumeration or floating-point type, we were not able to set
4802 the bounds since they refer to the type. These are always static. */
4803 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4804 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4806 tree gnu_scalar_type = gnu_type;
4807 tree gnu_low_bound, gnu_high_bound;
4809 /* If this is a padded type, we need to use the underlying type. */
4810 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4811 && TYPE_IS_PADDING_P (gnu_scalar_type))
4812 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4814 /* If this is a floating point type and we haven't set a floating
4815 point type yet, use this in the evaluation of the bounds. */
4816 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4817 longest_float_type_node = gnu_scalar_type;
4819 gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4820 gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity));
4822 if (kind == E_Enumeration_Type)
4824 /* Enumeration types have specific RM bounds. */
4825 SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound);
4826 SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound);
4828 /* Write full debugging information. Since this has both a
4829 typedef and a tag, avoid outputting the name twice. */
4830 DECL_ARTIFICIAL (gnu_decl) = 1;
4831 rest_of_type_decl_compilation (gnu_decl);
4836 /* Floating-point types don't have specific RM bounds. */
4837 TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound;
4838 TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound;
4842 /* If we deferred processing of incomplete types, re-enable it. If there
4843 were no other disables and we have some to process, do so. */
4844 if (this_deferred && --defer_incomplete_level == 0)
4846 if (defer_incomplete_list)
4848 struct incomplete *incp, *next;
4850 /* We are back to level 0 for the deferring of incomplete types.
4851 But processing these incomplete types below may itself require
4852 deferring, so preserve what we have and restart from scratch. */
4853 incp = defer_incomplete_list;
4854 defer_incomplete_list = NULL;
4856 /* For finalization, however, all types must be complete so we
4857 cannot do the same because deferred incomplete types may end up
4858 referencing each other. Process them all recursively first. */
4859 defer_finalize_level++;
4861 for (; incp; incp = next)
4866 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4867 gnat_to_gnu_type (incp->full_type));
4871 defer_finalize_level--;
4874 /* All the deferred incomplete types have been processed so we can
4875 now proceed with the finalization of the deferred types. */
4876 if (defer_finalize_level == 0 && defer_finalize_list)
4881 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4882 rest_of_type_decl_compilation_no_defer (t);
4884 VEC_free (tree, heap, defer_finalize_list);
4888 /* If we are not defining this type, see if it's in the incomplete list.
4889 If so, handle that list entry now. */
4890 else if (!definition)
4892 struct incomplete *incp;
4894 for (incp = defer_incomplete_list; incp; incp = incp->next)
4895 if (incp->old_type && incp->full_type == gnat_entity)
4897 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4898 TREE_TYPE (gnu_decl));
4899 incp->old_type = NULL_TREE;
4906 /* If this is a packed array type whose original array type is itself
4907 an Itype without freeze node, make sure the latter is processed. */
4908 if (Is_Packed_Array_Type (gnat_entity)
4909 && Is_Itype (Original_Array_Type (gnat_entity))
4910 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4911 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4912 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4917 /* Similar, but if the returned value is a COMPONENT_REF, return the
4921 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4923 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4925 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4926 gnu_field = TREE_OPERAND (gnu_field, 1);
4931 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4932 the GCC type corresponding to that entity. */
4935 gnat_to_gnu_type (Entity_Id gnat_entity)
4939 /* The back end never attempts to annotate generic types. */
4940 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4941 return void_type_node;
4943 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4944 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4946 return TREE_TYPE (gnu_decl);
4949 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4950 the unpadded version of the GCC type corresponding to that entity. */
4953 get_unpadded_type (Entity_Id gnat_entity)
4955 tree type = gnat_to_gnu_type (gnat_entity);
4957 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4958 type = TREE_TYPE (TYPE_FIELDS (type));
4963 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4964 Every TYPE_DECL generated for a type definition must be passed
4965 to this function once everything else has been done for it. */
4968 rest_of_type_decl_compilation (tree decl)
4970 /* We need to defer finalizing the type if incomplete types
4971 are being deferred or if they are being processed. */
4972 if (defer_incomplete_level || defer_finalize_level)
4973 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4975 rest_of_type_decl_compilation_no_defer (decl);
4978 /* Same as above but without deferring the compilation. This
4979 function should not be invoked directly on a TYPE_DECL. */
4982 rest_of_type_decl_compilation_no_defer (tree decl)
4984 const int toplev = global_bindings_p ();
4985 tree t = TREE_TYPE (decl);
4987 rest_of_decl_compilation (decl, toplev, 0);
4989 /* Now process all the variants. This is needed for STABS. */
4990 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4992 if (t == TREE_TYPE (decl))
4995 if (!TYPE_STUB_DECL (t))
4996 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4998 rest_of_type_compilation (t, toplev);
5002 /* Finalize any From_With_Type incomplete types. We do this after processing
5003 our compilation unit and after processing its spec, if this is a body. */
5006 finalize_from_with_types (void)
5008 struct incomplete *incp = defer_limited_with;
5009 struct incomplete *next;
5011 defer_limited_with = 0;
5012 for (; incp; incp = next)
5016 if (incp->old_type != 0)
5017 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
5018 gnat_to_gnu_type (incp->full_type));
5023 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
5024 kind of type (such E_Task_Type) that has a different type which Gigi
5025 uses for its representation. If the type does not have a special type
5026 for its representation, return GNAT_ENTITY. If a type is supposed to
5027 exist, but does not, abort unless annotating types, in which case
5028 return Empty. If GNAT_ENTITY is Empty, return Empty. */
5031 Gigi_Equivalent_Type (Entity_Id gnat_entity)
5033 Entity_Id gnat_equiv = gnat_entity;
5035 if (No (gnat_entity))
5038 switch (Ekind (gnat_entity))
5040 case E_Class_Wide_Subtype:
5041 if (Present (Equivalent_Type (gnat_entity)))
5042 gnat_equiv = Equivalent_Type (gnat_entity);
5045 case E_Access_Protected_Subprogram_Type:
5046 case E_Anonymous_Access_Protected_Subprogram_Type:
5047 gnat_equiv = Equivalent_Type (gnat_entity);
5050 case E_Class_Wide_Type:
5051 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
5052 ? Equivalent_Type (gnat_entity)
5053 : Root_Type (gnat_entity));
5057 case E_Task_Subtype:
5058 case E_Protected_Type:
5059 case E_Protected_Subtype:
5060 gnat_equiv = Corresponding_Record_Type (gnat_entity);
5067 gcc_assert (Present (gnat_equiv) || type_annotate_only);
5071 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
5072 using MECH as its passing mechanism, to be placed in the parameter
5073 list built for GNAT_SUBPROG. Assume a foreign convention for the
5074 latter if FOREIGN is true. Also set CICO to true if the parameter
5075 must use the copy-in copy-out implementation mechanism.
5077 The returned tree is a PARM_DECL, except for those cases where no
5078 parameter needs to be actually passed to the subprogram; the type
5079 of this "shadow" parameter is then returned instead. */
5082 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
5083 Entity_Id gnat_subprog, bool foreign, bool *cico)
5085 tree gnu_param_name = get_entity_name (gnat_param);
5086 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
5087 tree gnu_param_type_alt = NULL_TREE;
5088 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
5089 /* The parameter can be indirectly modified if its address is taken. */
5090 bool ro_param = in_param && !Address_Taken (gnat_param);
5091 bool by_return = false, by_component_ptr = false, by_ref = false;
5094 /* Copy-return is used only for the first parameter of a valued procedure.
5095 It's a copy mechanism for which a parameter is never allocated. */
5096 if (mech == By_Copy_Return)
5098 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5103 /* If this is either a foreign function or if the underlying type won't
5104 be passed by reference, strip off possible padding type. */
5105 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
5106 && TYPE_IS_PADDING_P (gnu_param_type))
5108 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5110 if (mech == By_Reference
5112 || (!must_pass_by_ref (unpadded_type)
5113 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5114 gnu_param_type = unpadded_type;
5117 /* If this is a read-only parameter, make a variant of the type that is
5118 read-only. ??? However, if this is an unconstrained array, that type
5119 can be very complex, so skip it for now. Likewise for any other
5120 self-referential type. */
5122 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5123 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5124 gnu_param_type = build_qualified_type (gnu_param_type,
5125 (TYPE_QUALS (gnu_param_type)
5126 | TYPE_QUAL_CONST));
5128 /* For foreign conventions, pass arrays as pointers to the element type.
5129 First check for unconstrained array and get the underlying array. */
5130 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5132 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5134 /* VMS descriptors are themselves passed by reference. */
5135 if (mech == By_Short_Descriptor ||
5136 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5138 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5139 Mechanism (gnat_param),
5141 else if (mech == By_Descriptor)
5143 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5144 chosen in fill_vms_descriptor. */
5146 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5147 Mechanism (gnat_param),
5150 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5151 Mechanism (gnat_param),
5155 /* Arrays are passed as pointers to element type for foreign conventions. */
5158 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5160 /* Strip off any multi-dimensional entries, then strip
5161 off the last array to get the component type. */
5162 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5163 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5164 gnu_param_type = TREE_TYPE (gnu_param_type);
5166 by_component_ptr = true;
5167 gnu_param_type = TREE_TYPE (gnu_param_type);
5170 gnu_param_type = build_qualified_type (gnu_param_type,
5171 (TYPE_QUALS (gnu_param_type)
5172 | TYPE_QUAL_CONST));
5174 gnu_param_type = build_pointer_type (gnu_param_type);
5177 /* Fat pointers are passed as thin pointers for foreign conventions. */
5178 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
5180 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5182 /* If we must pass or were requested to pass by reference, do so.
5183 If we were requested to pass by copy, do so.
5184 Otherwise, for foreign conventions, pass In Out or Out parameters
5185 or aggregates by reference. For COBOL and Fortran, pass all
5186 integer and FP types that way too. For Convention Ada, use
5187 the standard Ada default. */
5188 else if (must_pass_by_ref (gnu_param_type)
5189 || mech == By_Reference
5192 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5194 && (Convention (gnat_subprog) == Convention_Fortran
5195 || Convention (gnat_subprog) == Convention_COBOL)
5196 && (INTEGRAL_TYPE_P (gnu_param_type)
5197 || FLOAT_TYPE_P (gnu_param_type)))
5199 && default_pass_by_ref (gnu_param_type)))))
5201 gnu_param_type = build_reference_type (gnu_param_type);
5205 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5209 if (mech == By_Copy && (by_ref || by_component_ptr))
5210 post_error ("?cannot pass & by copy", gnat_param);
5212 /* If this is an Out parameter that isn't passed by reference and isn't
5213 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5214 it will be a VAR_DECL created when we process the procedure, so just
5215 return its type. For the special parameter of a valued procedure,
5218 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5219 Out parameters with discriminants or implicit initial values to be
5220 handled like In Out parameters. These type are normally built as
5221 aggregates, hence passed by reference, except for some packed arrays
5222 which end up encoded in special integer types.
5224 The exception we need to make is then for packed arrays of records
5225 with discriminants or implicit initial values. We have no light/easy
5226 way to check for the latter case, so we merely check for packed arrays
5227 of records. This may lead to useless copy-in operations, but in very
5228 rare cases only, as these would be exceptions in a set of already
5229 exceptional situations. */
5230 if (Ekind (gnat_param) == E_Out_Parameter
5233 || (mech != By_Descriptor
5234 && mech != By_Short_Descriptor
5235 && !POINTER_TYPE_P (gnu_param_type)
5236 && !AGGREGATE_TYPE_P (gnu_param_type)))
5237 && !(Is_Array_Type (Etype (gnat_param))
5238 && Is_Packed (Etype (gnat_param))
5239 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5240 return gnu_param_type;
5242 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5243 ro_param || by_ref || by_component_ptr);
5244 DECL_BY_REF_P (gnu_param) = by_ref;
5245 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5246 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5247 mech == By_Short_Descriptor);
5248 DECL_POINTS_TO_READONLY_P (gnu_param)
5249 = (ro_param && (by_ref || by_component_ptr));
5251 /* Save the alternate descriptor type, if any. */
5252 if (gnu_param_type_alt)
5253 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5255 /* If no Mechanism was specified, indicate what we're using, then
5256 back-annotate it. */
5257 if (mech == Default)
5258 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5260 Set_Mechanism (gnat_param, mech);
5264 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5267 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5269 while (Present (Corresponding_Discriminant (discr1)))
5270 discr1 = Corresponding_Discriminant (discr1);
5272 while (Present (Corresponding_Discriminant (discr2)))
5273 discr2 = Corresponding_Discriminant (discr2);
5276 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5279 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
5280 a non-aliased component in the back-end sense. */
5283 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
5285 /* If the type below this is a multi-array type, then
5286 this does not have aliased components. */
5287 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5288 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5291 if (Has_Aliased_Components (gnat_type))
5294 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5297 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5300 compile_time_known_address_p (Node_Id gnat_address)
5302 /* Catch System'To_Address. */
5303 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5304 gnat_address = Expression (gnat_address);
5306 return Compile_Time_Known_Value (gnat_address);
5309 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5310 be elaborated at the point of its definition, but do nothing else. */
5313 elaborate_entity (Entity_Id gnat_entity)
5315 switch (Ekind (gnat_entity))
5317 case E_Signed_Integer_Subtype:
5318 case E_Modular_Integer_Subtype:
5319 case E_Enumeration_Subtype:
5320 case E_Ordinary_Fixed_Point_Subtype:
5321 case E_Decimal_Fixed_Point_Subtype:
5322 case E_Floating_Point_Subtype:
5324 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5325 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5327 /* ??? Tests to avoid Constraint_Error in static expressions
5328 are needed until after the front stops generating bogus
5329 conversions on bounds of real types. */
5330 if (!Raises_Constraint_Error (gnat_lb))
5331 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5332 true, false, Needs_Debug_Info (gnat_entity));
5333 if (!Raises_Constraint_Error (gnat_hb))
5334 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5335 true, false, Needs_Debug_Info (gnat_entity));
5341 Node_Id full_definition = Declaration_Node (gnat_entity);
5342 Node_Id record_definition = Type_Definition (full_definition);
5344 /* If this is a record extension, go a level further to find the
5345 record definition. */
5346 if (Nkind (record_definition) == N_Derived_Type_Definition)
5347 record_definition = Record_Extension_Part (record_definition);
5351 case E_Record_Subtype:
5352 case E_Private_Subtype:
5353 case E_Limited_Private_Subtype:
5354 case E_Record_Subtype_With_Private:
5355 if (Is_Constrained (gnat_entity)
5356 && Has_Discriminants (gnat_entity)
5357 && Present (Discriminant_Constraint (gnat_entity)))
5359 Node_Id gnat_discriminant_expr;
5360 Entity_Id gnat_field;
5363 = First_Discriminant (Implementation_Base_Type (gnat_entity)),
5364 gnat_discriminant_expr
5365 = First_Elmt (Discriminant_Constraint (gnat_entity));
5366 Present (gnat_field);
5367 gnat_field = Next_Discriminant (gnat_field),
5368 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5369 /* ??? For now, ignore access discriminants. */
5370 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5371 elaborate_expression (Node (gnat_discriminant_expr),
5372 gnat_entity, get_entity_name (gnat_field),
5373 true, false, false);
5380 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5381 any entities on its entity chain similarly. */
5384 mark_out_of_scope (Entity_Id gnat_entity)
5386 Entity_Id gnat_sub_entity;
5387 unsigned int kind = Ekind (gnat_entity);
5389 /* If this has an entity list, process all in the list. */
5390 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5391 || IN (kind, Private_Kind)
5392 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5393 || kind == E_Function || kind == E_Generic_Function
5394 || kind == E_Generic_Package || kind == E_Generic_Procedure
5395 || kind == E_Loop || kind == E_Operator || kind == E_Package
5396 || kind == E_Package_Body || kind == E_Procedure
5397 || kind == E_Record_Type || kind == E_Record_Subtype
5398 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5399 for (gnat_sub_entity = First_Entity (gnat_entity);
5400 Present (gnat_sub_entity);
5401 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5402 if (Scope (gnat_sub_entity) == gnat_entity
5403 && gnat_sub_entity != gnat_entity)
5404 mark_out_of_scope (gnat_sub_entity);
5406 /* Now clear this if it has been defined, but only do so if it isn't
5407 a subprogram or parameter. We could refine this, but it isn't
5408 worth it. If this is statically allocated, it is supposed to
5409 hang around out of cope. */
5410 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5411 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5413 save_gnu_tree (gnat_entity, NULL_TREE, true);
5414 save_gnu_tree (gnat_entity, error_mark_node, true);
5418 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5419 If this is a multi-dimensional array type, do this recursively.
5422 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5423 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5424 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5427 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5429 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5430 of a one-dimensional array, since the padding has the same alias set
5431 as the field type, but if it's a multi-dimensional array, we need to
5432 see the inner types. */
5433 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5434 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5435 || TYPE_IS_PADDING_P (gnu_old_type)))
5436 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5438 /* Unconstrained array types are deemed incomplete and would thus be given
5439 alias set 0. Retrieve the underlying array type. */
5440 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5442 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5443 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5445 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5447 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5448 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5449 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5450 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5454 case ALIAS_SET_COPY:
5455 /* The alias set shouldn't be copied between array types with different
5456 aliasing settings because this can break the aliasing relationship
5457 between the array type and its element type. */
5458 #ifndef ENABLE_CHECKING
5459 if (flag_strict_aliasing)
5461 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5462 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5463 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5464 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5466 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5469 case ALIAS_SET_SUBSET:
5470 case ALIAS_SET_SUPERSET:
5472 alias_set_type old_set = get_alias_set (gnu_old_type);
5473 alias_set_type new_set = get_alias_set (gnu_new_type);
5475 /* Do nothing if the alias sets conflict. This ensures that we
5476 never call record_alias_subset several times for the same pair
5477 or at all for alias set 0. */
5478 if (!alias_sets_conflict_p (old_set, new_set))
5480 if (op == ALIAS_SET_SUBSET)
5481 record_alias_subset (old_set, new_set);
5483 record_alias_subset (new_set, old_set);
5492 record_component_aliases (gnu_new_type);
5495 /* Return a TREE_LIST describing the substitutions needed to reflect the
5496 discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can
5497 be in any order. TREE_PURPOSE gives the tree for the discriminant and
5498 TREE_VALUE is the replacement value. They are in the form of operands
5499 to substitute_in_expr. DEFINITION is true if this is for a definition
5503 build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition)
5505 tree gnu_list = NULL_TREE;
5506 Entity_Id gnat_discrim;
5509 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5510 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5511 Present (gnat_discrim);
5512 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5513 gnat_value = Next_Elmt (gnat_value))
5514 /* Ignore access discriminants. */
5515 if (!Is_Access_Type (Etype (Node (gnat_value))))
5516 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5517 elaborate_expression
5518 (Node (gnat_value), gnat_subtype,
5519 get_entity_name (gnat_discrim), definition,
5526 /* Return true if the size represented by GNU_SIZE can be handled by an
5527 allocation. If STATIC_P is true, consider only what can be done with a
5528 static allocation. */
5531 allocatable_size_p (tree gnu_size, bool static_p)
5533 HOST_WIDE_INT our_size;
5535 /* If this is not a static allocation, the only case we want to forbid
5536 is an overflowing size. That will be converted into a raise a
5539 return !(TREE_CODE (gnu_size) == INTEGER_CST
5540 && TREE_OVERFLOW (gnu_size));
5542 /* Otherwise, we need to deal with both variable sizes and constant
5543 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5544 since assemblers may not like very large sizes. */
5545 if (!host_integerp (gnu_size, 1))
5548 our_size = tree_low_cst (gnu_size, 1);
5549 return (int) our_size == our_size;
5552 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5553 NAME, ARGS and ERROR_POINT. */
5556 prepend_one_attribute_to (struct attrib ** attr_list,
5557 enum attr_type attr_type,
5560 Node_Id attr_error_point)
5562 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5564 attr->type = attr_type;
5565 attr->name = attr_name;
5566 attr->args = attr_args;
5567 attr->error_point = attr_error_point;
5569 attr->next = *attr_list;
5573 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5576 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5580 /* Attributes are stored as Representation Item pragmas. */
5582 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5583 gnat_temp = Next_Rep_Item (gnat_temp))
5584 if (Nkind (gnat_temp) == N_Pragma)
5586 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5587 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5588 enum attr_type etype;
5590 /* Map the kind of pragma at hand. Skip if this is not one
5591 we know how to handle. */
5593 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5595 case Pragma_Machine_Attribute:
5596 etype = ATTR_MACHINE_ATTRIBUTE;
5599 case Pragma_Linker_Alias:
5600 etype = ATTR_LINK_ALIAS;
5603 case Pragma_Linker_Section:
5604 etype = ATTR_LINK_SECTION;
5607 case Pragma_Linker_Constructor:
5608 etype = ATTR_LINK_CONSTRUCTOR;
5611 case Pragma_Linker_Destructor:
5612 etype = ATTR_LINK_DESTRUCTOR;
5615 case Pragma_Weak_External:
5616 etype = ATTR_WEAK_EXTERNAL;
5619 case Pragma_Thread_Local_Storage:
5620 etype = ATTR_THREAD_LOCAL_STORAGE;
5627 /* See what arguments we have and turn them into GCC trees for
5628 attribute handlers. These expect identifier for strings. We
5629 handle at most two arguments, static expressions only. */
5631 if (Present (gnat_assoc) && Present (First (gnat_assoc)))
5633 Node_Id gnat_arg0 = Next (First (gnat_assoc));
5634 Node_Id gnat_arg1 = Empty;
5636 if (Present (gnat_arg0)
5637 && Is_Static_Expression (Expression (gnat_arg0)))
5639 gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0));
5641 if (TREE_CODE (gnu_arg0) == STRING_CST)
5642 gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0));
5644 gnat_arg1 = Next (gnat_arg0);
5647 if (Present (gnat_arg1)
5648 && Is_Static_Expression (Expression (gnat_arg1)))
5650 gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1));
5652 if (TREE_CODE (gnu_arg1) == STRING_CST)
5653 gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1));
5657 /* Prepend to the list now. Make a list of the argument we might
5658 have, as GCC expects it. */
5659 prepend_one_attribute_to
5662 (gnu_arg1 != NULL_TREE)
5663 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5664 Present (Next (First (gnat_assoc)))
5665 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5669 /* Called when we need to protect a variable object using a SAVE_EXPR. */
5672 maybe_variable (tree gnu_operand)
5674 if (TREE_CONSTANT (gnu_operand)
5675 || TREE_READONLY (gnu_operand)
5676 || TREE_CODE (gnu_operand) == SAVE_EXPR
5677 || TREE_CODE (gnu_operand) == NULL_EXPR)
5680 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5683 = build1 (UNCONSTRAINED_ARRAY_REF, TREE_TYPE (gnu_operand),
5684 variable_size (TREE_OPERAND (gnu_operand, 0)));
5686 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5687 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5691 return variable_size (gnu_operand);
5694 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5695 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5696 return the GCC tree to use for that expression. GNU_NAME is the suffix
5697 to use if a variable needs to be created and DEFINITION is true if this
5698 is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result;
5699 otherwise, we are just elaborating the expression for side-effects. If
5700 NEED_DEBUG is true, we need a variable for debugging purposes even if it
5701 isn't needed for code generation. */
5704 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name,
5705 bool definition, bool need_value, bool need_debug)
5709 /* If we already elaborated this expression (e.g. it was involved
5710 in the definition of a private type), use the old value. */
5711 if (present_gnu_tree (gnat_expr))
5712 return get_gnu_tree (gnat_expr);
5714 /* If we don't need a value and this is static or a discriminant,
5715 we don't need to do anything. */
5717 && (Is_OK_Static_Expression (gnat_expr)
5718 || (Nkind (gnat_expr) == N_Identifier
5719 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5722 /* If it's a static expression, we don't need a variable for debugging. */
5723 if (need_debug && Is_OK_Static_Expression (gnat_expr))
5726 /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */
5727 gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity,
5728 gnu_name, definition, need_debug);
5730 /* Save the expression in case we try to elaborate this entity again. Since
5731 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5732 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5733 save_gnu_tree (gnat_expr, gnu_expr, true);
5735 return need_value ? gnu_expr : error_mark_node;
5738 /* Similar, but take a GNU expression and always return a result. */
5741 elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
5742 bool definition, bool need_debug)
5744 /* Skip any conversions and simple arithmetics to see if the expression
5745 is a read-only variable.
5746 ??? This really should remain read-only, but we have to think about
5747 the typing of the tree here. */
5749 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5750 tree gnu_decl = NULL_TREE;
5751 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5754 /* In most cases, we won't see a naked FIELD_DECL because a discriminant
5755 reference will have been replaced with a COMPONENT_REF when the type
5756 is being elaborated. However, there are some cases involving child
5757 types where we will. So convert it to a COMPONENT_REF. We hope it
5758 will be at the highest level of the expression in these cases. */
5759 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5760 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5761 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5762 gnu_expr, NULL_TREE);
5764 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5765 that is read-only, make a variable that is initialized to contain the
5766 bound when the package containing the definition is elaborated. If
5767 this entity is defined at top level and a bound or discriminant value
5768 isn't a constant or a reference to a discriminant, replace the bound
5769 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5770 rely here on the fact that an expression cannot contain both the
5771 discriminant and some other variable. */
5772 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5773 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5774 && (TREE_READONLY (gnu_inner_expr)
5775 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5776 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5778 /* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */
5779 if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr))
5782 /* Now create the variable if we need it. */
5783 if (need_debug || (expr_variable && expr_global))
5785 = create_var_decl (create_concat_name (gnat_entity,
5786 IDENTIFIER_POINTER (gnu_name)),
5787 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5788 !need_debug, Is_Public (gnat_entity),
5789 !definition, false, NULL, gnat_entity);
5791 /* We only need to use this variable if we are in global context since GCC
5792 can do the right thing in the local case. */
5793 if (expr_global && expr_variable)
5796 return expr_variable ? maybe_variable (gnu_expr) : gnu_expr;
5799 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5800 starting bit position so that it is aligned to ALIGN bits, and leaving at
5801 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5802 record is guaranteed to get. */
5805 make_aligning_type (tree type, unsigned int align, tree size,
5806 unsigned int base_align, int room)
5808 /* We will be crafting a record type with one field at a position set to be
5809 the next multiple of ALIGN past record'address + room bytes. We use a
5810 record placeholder to express record'address. */
5812 tree record_type = make_node (RECORD_TYPE);
5813 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5816 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5818 /* The diagram below summarizes the shape of what we manipulate:
5820 <--------- pos ---------->
5821 { +------------+-------------+-----------------+
5822 record =>{ |############| ... | field (type) |
5823 { +------------+-------------+-----------------+
5824 |<-- room -->|<- voffset ->|<---- size ----->|
5827 record_addr vblock_addr
5829 Every length is in sizetype bytes there, except "pos" which has to be
5830 set as a bit position in the GCC tree for the record. */
5832 tree room_st = size_int (room);
5833 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5834 tree voffset_st, pos, field;
5836 tree name = TYPE_NAME (type);
5838 if (TREE_CODE (name) == TYPE_DECL)
5839 name = DECL_NAME (name);
5841 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5843 /* Compute VOFFSET and then POS. The next byte position multiple of some
5844 alignment after some address is obtained by "and"ing the alignment minus
5845 1 with the two's complement of the address. */
5847 voffset_st = size_binop (BIT_AND_EXPR,
5848 size_diffop (size_zero_node, vblock_addr_st),
5849 ssize_int ((align / BITS_PER_UNIT) - 1));
5851 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5853 pos = size_binop (MULT_EXPR,
5854 convert (bitsizetype,
5855 size_binop (PLUS_EXPR, room_st, voffset_st)),
5858 /* Craft the GCC record representation. We exceptionally do everything
5859 manually here because 1) our generic circuitry is not quite ready to
5860 handle the complex position/size expressions we are setting up, 2) we
5861 have a strong simplifying factor at hand: we know the maximum possible
5862 value of voffset, and 3) we have to set/reset at least the sizes in
5863 accordance with this maximum value anyway, as we need them to convey
5864 what should be "alloc"ated for this type.
5866 Use -1 as the 'addressable' indication for the field to prevent the
5867 creation of a bitfield. We don't need one, it would have damaging
5868 consequences on the alignment computation, and create_field_decl would
5869 make one without this special argument, for instance because of the
5870 complex position expression. */
5872 field = create_field_decl (get_identifier ("F"), type, record_type,
5874 TYPE_FIELDS (record_type) = field;
5876 TYPE_ALIGN (record_type) = base_align;
5877 TYPE_USER_ALIGN (record_type) = 1;
5879 TYPE_SIZE (record_type)
5880 = size_binop (PLUS_EXPR,
5881 size_binop (MULT_EXPR, convert (bitsizetype, size),
5883 bitsize_int (align + room * BITS_PER_UNIT));
5884 TYPE_SIZE_UNIT (record_type)
5885 = size_binop (PLUS_EXPR, size,
5886 size_int (room + align / BITS_PER_UNIT));
5888 SET_TYPE_MODE (record_type, BLKmode);
5890 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5894 /* Return the result of rounding T up to ALIGN. */
5896 static inline unsigned HOST_WIDE_INT
5897 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5905 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5906 as the field type of a packed record if IN_RECORD is true, or as the
5907 component type of a packed array if IN_RECORD is false. See if we can
5908 rewrite it either as a type that has a non-BLKmode, which we can pack
5909 tighter in the packed record case, or as a smaller type. If so, return
5910 the new type. If not, return the original type. */
5913 make_packable_type (tree type, bool in_record)
5915 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5916 unsigned HOST_WIDE_INT new_size;
5917 tree new_type, old_field, field_list = NULL_TREE;
5919 /* No point in doing anything if the size is zero. */
5923 new_type = make_node (TREE_CODE (type));
5925 /* Copy the name and flags from the old type to that of the new.
5926 Note that we rely on the pointer equality created here for
5927 TYPE_NAME to look through conversions in various places. */
5928 TYPE_NAME (new_type) = TYPE_NAME (type);
5929 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5930 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5931 if (TREE_CODE (type) == RECORD_TYPE)
5932 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5934 /* If we are in a record and have a small size, set the alignment to
5935 try for an integral mode. Otherwise set it to try for a smaller
5936 type with BLKmode. */
5937 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5939 TYPE_ALIGN (new_type) = ceil_alignment (size);
5940 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5944 unsigned HOST_WIDE_INT align;
5946 /* Do not try to shrink the size if the RM size is not constant. */
5947 if (TYPE_CONTAINS_TEMPLATE_P (type)
5948 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5951 /* Round the RM size up to a unit boundary to get the minimal size
5952 for a BLKmode record. Give up if it's already the size. */
5953 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5954 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5955 if (new_size == size)
5958 align = new_size & -new_size;
5959 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5962 TYPE_USER_ALIGN (new_type) = 1;
5964 /* Now copy the fields, keeping the position and size as we don't want
5965 to change the layout by propagating the packedness downwards. */
5966 for (old_field = TYPE_FIELDS (type); old_field;
5967 old_field = TREE_CHAIN (old_field))
5969 tree new_field_type = TREE_TYPE (old_field);
5970 tree new_field, new_size;
5972 if ((TREE_CODE (new_field_type) == RECORD_TYPE
5973 || TREE_CODE (new_field_type) == UNION_TYPE
5974 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5975 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5976 && host_integerp (TYPE_SIZE (new_field_type), 1))
5977 new_field_type = make_packable_type (new_field_type, true);
5979 /* However, for the last field in a not already packed record type
5980 that is of an aggregate type, we need to use the RM size in the
5981 packable version of the record type, see finish_record_type. */
5982 if (!TREE_CHAIN (old_field)
5983 && !TYPE_PACKED (type)
5984 && (TREE_CODE (new_field_type) == RECORD_TYPE
5985 || TREE_CODE (new_field_type) == UNION_TYPE
5986 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5987 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5988 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5989 && TYPE_ADA_SIZE (new_field_type))
5990 new_size = TYPE_ADA_SIZE (new_field_type);
5992 new_size = DECL_SIZE (old_field);
5994 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5995 new_type, TYPE_PACKED (type), new_size,
5996 bit_position (old_field),
5997 !DECL_NONADDRESSABLE_P (old_field));
5999 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
6000 SET_DECL_ORIGINAL_FIELD
6001 (new_field, (DECL_ORIGINAL_FIELD (old_field)
6002 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
6004 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
6005 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
6007 TREE_CHAIN (new_field) = field_list;
6008 field_list = new_field;
6011 finish_record_type (new_type, nreverse (field_list), 2, true);
6012 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
6014 /* If this is a padding record, we never want to make the size smaller
6015 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
6016 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
6017 || TREE_CODE (type) == QUAL_UNION_TYPE)
6019 TYPE_SIZE (new_type) = TYPE_SIZE (type);
6020 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
6024 TYPE_SIZE (new_type) = bitsize_int (new_size);
6025 TYPE_SIZE_UNIT (new_type)
6026 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
6029 if (!TYPE_CONTAINS_TEMPLATE_P (type))
6030 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
6032 compute_record_mode (new_type);
6034 /* Try harder to get a packable type if necessary, for example
6035 in case the record itself contains a BLKmode field. */
6036 if (in_record && TYPE_MODE (new_type) == BLKmode)
6037 SET_TYPE_MODE (new_type,
6038 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
6040 /* If neither the mode nor the size has shrunk, return the old type. */
6041 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
6047 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
6048 if needed. We have already verified that SIZE and TYPE are large enough.
6050 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
6053 IS_USER_TYPE is true if we must complete the original type.
6055 DEFINITION is true if this type is being defined.
6057 SAME_RM_SIZE is true if the RM size of the resulting type is to be set
6058 to SIZE too; otherwise, it's set to the RM size of the original type. */
6061 maybe_pad_type (tree type, tree size, unsigned int align,
6062 Entity_Id gnat_entity, const char *name_trailer,
6063 bool is_user_type, bool definition, bool same_rm_size)
6065 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
6066 tree orig_size = TYPE_SIZE (type);
6067 unsigned int orig_align = align;
6070 /* If TYPE is a padded type, see if it agrees with any size and alignment
6071 we were given. If so, return the original type. Otherwise, strip
6072 off the padding, since we will either be returning the inner type
6073 or repadding it. If no size or alignment is specified, use that of
6074 the original padded type. */
6075 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
6078 || operand_equal_p (round_up (size,
6079 MAX (align, TYPE_ALIGN (type))),
6080 round_up (TYPE_SIZE (type),
6081 MAX (align, TYPE_ALIGN (type))),
6083 && (align == 0 || align == TYPE_ALIGN (type)))
6087 size = TYPE_SIZE (type);
6089 align = TYPE_ALIGN (type);
6091 type = TREE_TYPE (TYPE_FIELDS (type));
6092 orig_size = TYPE_SIZE (type);
6095 /* If the size is either not being changed or is being made smaller (which
6096 is not done here and is only valid for bitfields anyway), show the size
6097 isn't changing. Likewise, clear the alignment if it isn't being
6098 changed. Then return if we aren't doing anything. */
6100 && (operand_equal_p (size, orig_size, 0)
6101 || (TREE_CODE (orig_size) == INTEGER_CST
6102 && tree_int_cst_lt (size, orig_size))))
6105 if (align == TYPE_ALIGN (type))
6108 if (align == 0 && !size)
6111 /* If requested, complete the original type and give it a name. */
6113 create_type_decl (get_entity_name (gnat_entity), type,
6114 NULL, !Comes_From_Source (gnat_entity),
6116 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6117 && DECL_IGNORED_P (TYPE_NAME (type))),
6120 /* We used to modify the record in place in some cases, but that could
6121 generate incorrect debugging information. So make a new record
6123 record = make_node (RECORD_TYPE);
6124 TYPE_IS_PADDING_P (record) = 1;
6126 if (Present (gnat_entity))
6127 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
6129 TYPE_VOLATILE (record)
6130 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6132 TYPE_ALIGN (record) = align;
6134 TYPE_USER_ALIGN (record) = align;
6136 TYPE_SIZE (record) = size ? size : orig_size;
6137 TYPE_SIZE_UNIT (record)
6138 = convert (sizetype,
6139 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6140 bitsize_unit_node));
6142 /* If we are changing the alignment and the input type is a record with
6143 BLKmode and a small constant size, try to make a form that has an
6144 integral mode. This might allow the padding record to also have an
6145 integral mode, which will be much more efficient. There is no point
6146 in doing so if a size is specified unless it is also a small constant
6147 size and it is incorrect to do so if we cannot guarantee that the mode
6148 will be naturally aligned since the field must always be addressable.
6150 ??? This might not always be a win when done for a stand-alone object:
6151 since the nominal and the effective type of the object will now have
6152 different modes, a VIEW_CONVERT_EXPR will be required for converting
6153 between them and it might be hard to overcome afterwards, including
6154 at the RTL level when the stand-alone object is accessed as a whole. */
6156 && TREE_CODE (type) == RECORD_TYPE
6157 && TYPE_MODE (type) == BLKmode
6158 && TREE_CODE (orig_size) == INTEGER_CST
6159 && !TREE_OVERFLOW (orig_size)
6160 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6162 || (TREE_CODE (size) == INTEGER_CST
6163 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6165 tree packable_type = make_packable_type (type, true);
6166 if (TYPE_MODE (packable_type) != BLKmode
6167 && align >= TYPE_ALIGN (packable_type))
6168 type = packable_type;
6171 /* Now create the field with the original size. */
6172 field = create_field_decl (get_identifier ("F"), type, record, 0,
6173 orig_size, bitsize_zero_node, 1);
6174 DECL_INTERNAL_P (field) = 1;
6176 /* Do not finalize it until after the auxiliary record is built. */
6177 finish_record_type (record, field, 1, true);
6179 /* Set the same size for its RM size if requested; otherwise reuse
6180 the RM size of the original type. */
6181 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6183 /* Unless debugging information isn't being written for the input type,
6184 write a record that shows what we are a subtype of and also make a
6185 variable that indicates our size, if still variable. */
6186 if (TYPE_NAME (record)
6187 && AGGREGATE_TYPE_P (type)
6188 && TREE_CODE (orig_size) != INTEGER_CST
6189 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6190 && DECL_IGNORED_P (TYPE_NAME (type))))
6192 tree marker = make_node (RECORD_TYPE);
6193 tree name = TYPE_NAME (record);
6194 tree orig_name = TYPE_NAME (type);
6196 if (TREE_CODE (name) == TYPE_DECL)
6197 name = DECL_NAME (name);
6199 if (TREE_CODE (orig_name) == TYPE_DECL)
6200 orig_name = DECL_NAME (orig_name);
6202 TYPE_NAME (marker) = concat_name (name, "XVS");
6203 finish_record_type (marker,
6204 create_field_decl (orig_name,
6205 build_reference_type (type),
6206 marker, 0, NULL_TREE, NULL_TREE,
6210 add_parallel_type (TYPE_STUB_DECL (record), marker);
6212 if (size && TREE_CODE (size) != INTEGER_CST && definition)
6213 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6214 TYPE_SIZE_UNIT (record), false, false, false,
6215 false, NULL, gnat_entity);
6218 rest_of_record_type_compilation (record);
6220 /* If the size was widened explicitly, maybe give a warning. Take the
6221 original size as the maximum size of the input if there was an
6222 unconstrained record involved and round it up to the specified alignment,
6223 if one was specified. */
6224 if (CONTAINS_PLACEHOLDER_P (orig_size))
6225 orig_size = max_size (orig_size, true);
6228 orig_size = round_up (orig_size, align);
6230 if (size && Present (gnat_entity)
6231 && !operand_equal_p (size, orig_size, 0)
6232 && !(TREE_CODE (size) == INTEGER_CST
6233 && TREE_CODE (orig_size) == INTEGER_CST
6234 && tree_int_cst_lt (size, orig_size)))
6236 Node_Id gnat_error_node = Empty;
6238 if (Is_Packed_Array_Type (gnat_entity))
6239 gnat_entity = Original_Array_Type (gnat_entity);
6241 if ((Ekind (gnat_entity) == E_Component
6242 || Ekind (gnat_entity) == E_Discriminant)
6243 && Present (Component_Clause (gnat_entity)))
6244 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6245 else if (Present (Size_Clause (gnat_entity)))
6246 gnat_error_node = Expression (Size_Clause (gnat_entity));
6248 /* Generate message only for entities that come from source, since
6249 if we have an entity created by expansion, the message will be
6250 generated for some other corresponding source entity. */
6251 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
6252 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
6254 size_diffop (size, orig_size));
6256 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
6257 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6258 gnat_entity, gnat_entity,
6259 size_diffop (size, orig_size));
6265 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6266 the value passed against the list of choices. */
6269 choices_to_gnu (tree operand, Node_Id choices)
6273 tree result = integer_zero_node;
6274 tree this_test, low = 0, high = 0, single = 0;
6276 for (choice = First (choices); Present (choice); choice = Next (choice))
6278 switch (Nkind (choice))
6281 low = gnat_to_gnu (Low_Bound (choice));
6282 high = gnat_to_gnu (High_Bound (choice));
6284 /* There's no good type to use here, so we might as well use
6285 integer_type_node. */
6287 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6288 build_binary_op (GE_EXPR, integer_type_node,
6290 build_binary_op (LE_EXPR, integer_type_node,
6295 case N_Subtype_Indication:
6296 gnat_temp = Range_Expression (Constraint (choice));
6297 low = gnat_to_gnu (Low_Bound (gnat_temp));
6298 high = gnat_to_gnu (High_Bound (gnat_temp));
6301 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6302 build_binary_op (GE_EXPR, integer_type_node,
6304 build_binary_op (LE_EXPR, integer_type_node,
6309 case N_Expanded_Name:
6310 /* This represents either a subtype range, an enumeration
6311 literal, or a constant Ekind says which. If an enumeration
6312 literal or constant, fall through to the next case. */
6313 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6314 && Ekind (Entity (choice)) != E_Constant)
6316 tree type = gnat_to_gnu_type (Entity (choice));
6318 low = TYPE_MIN_VALUE (type);
6319 high = TYPE_MAX_VALUE (type);
6322 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6323 build_binary_op (GE_EXPR, integer_type_node,
6325 build_binary_op (LE_EXPR, integer_type_node,
6330 /* ... fall through ... */
6332 case N_Character_Literal:
6333 case N_Integer_Literal:
6334 single = gnat_to_gnu (choice);
6335 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6339 case N_Others_Choice:
6340 this_test = integer_one_node;
6347 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6354 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6355 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6358 adjust_packed (tree field_type, tree record_type, int packed)
6360 /* If the field contains an item of variable size, we cannot pack it
6361 because we cannot create temporaries of non-fixed size in case
6362 we need to take the address of the field. See addressable_p and
6363 the notes on the addressability issues for further details. */
6364 if (is_variable_size (field_type))
6367 /* If the alignment of the record is specified and the field type
6368 is over-aligned, request Storage_Unit alignment for the field. */
6371 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6380 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6381 placed in GNU_RECORD_TYPE.
6383 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6384 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6385 record has a specified alignment.
6387 DEFINITION is true if this field is for a record being defined. */
6390 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6393 tree gnu_field_id = get_entity_name (gnat_field);
6394 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6395 tree gnu_field, gnu_size, gnu_pos;
6396 bool needs_strict_alignment
6397 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6398 || Treat_As_Volatile (gnat_field));
6400 /* If this field requires strict alignment, we cannot pack it because
6401 it would very likely be under-aligned in the record. */
6402 if (needs_strict_alignment)
6405 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6407 /* If a size is specified, use it. Otherwise, if the record type is packed,
6408 use the official RM size. See "Handling of Type'Size Values" in Einfo
6409 for further details. */
6410 if (Known_Static_Esize (gnat_field))
6411 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6412 gnat_field, FIELD_DECL, false, true);
6413 else if (packed == 1)
6414 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6415 gnat_field, FIELD_DECL, false, true);
6417 gnu_size = NULL_TREE;
6419 /* If we have a specified size that's smaller than that of the field type,
6420 or a position is specified, and the field type is a record, see if we can
6421 get either an integral mode form of the type or a smaller form. If we
6422 can, show a size was specified for the field if there wasn't one already,
6423 so we know to make this a bitfield and avoid making things wider.
6425 Doing this is first useful if the record is packed because we may then
6426 place the field at a non-byte-aligned position and so achieve tighter
6429 This is in addition *required* if the field shares a byte with another
6430 field and the front-end lets the back-end handle the references, because
6431 GCC does not handle BLKmode bitfields properly.
6433 We avoid the transformation if it is not required or potentially useful,
6434 as it might entail an increase of the field's alignment and have ripple
6435 effects on the outer record type. A typical case is a field known to be
6436 byte aligned and not to share a byte with another field.
6438 Besides, we don't even look the possibility of a transformation in cases
6439 known to be in error already, for instance when an invalid size results
6440 from a component clause. */
6442 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6443 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
6444 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6447 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6448 || Present (Component_Clause (gnat_field))))))
6450 /* See what the alternate type and size would be. */
6451 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6453 bool has_byte_aligned_clause
6454 = Present (Component_Clause (gnat_field))
6455 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6456 % BITS_PER_UNIT == 0);
6458 /* Compute whether we should avoid the substitution. */
6460 /* There is no point substituting if there is no change... */
6461 = (gnu_packable_type == gnu_field_type)
6462 /* ... nor when the field is known to be byte aligned and not to
6463 share a byte with another field. */
6464 || (has_byte_aligned_clause
6465 && value_factor_p (gnu_size, BITS_PER_UNIT))
6466 /* The size of an aliased field must be an exact multiple of the
6467 type's alignment, which the substitution might increase. Reject
6468 substitutions that would so invalidate a component clause when the
6469 specified position is byte aligned, as the change would have no
6470 real benefit from the packing standpoint anyway. */
6471 || (Is_Aliased (gnat_field)
6472 && has_byte_aligned_clause
6473 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6475 /* Substitute unless told otherwise. */
6478 gnu_field_type = gnu_packable_type;
6481 gnu_size = rm_size (gnu_field_type);
6485 /* If we are packing the record and the field is BLKmode, round the
6486 size up to a byte boundary. */
6487 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6488 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6490 if (Present (Component_Clause (gnat_field)))
6492 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6493 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6494 gnat_field, FIELD_DECL, false, true);
6496 /* Ensure the position does not overlap with the parent subtype,
6498 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6501 = gnat_to_gnu_type (Parent_Subtype
6502 (Underlying_Type (Scope (gnat_field))));
6504 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6505 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6508 ("offset of& must be beyond parent{, minimum allowed is ^}",
6509 First_Bit (Component_Clause (gnat_field)), gnat_field,
6510 TYPE_SIZE_UNIT (gnu_parent));
6514 /* If this field needs strict alignment, ensure the record is
6515 sufficiently aligned and that that position and size are
6516 consistent with the alignment. */
6517 if (needs_strict_alignment)
6519 TYPE_ALIGN (gnu_record_type)
6520 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6523 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6525 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6527 ("atomic field& must be natural size of type{ (^)}",
6528 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6529 TYPE_SIZE (gnu_field_type));
6531 else if (Is_Aliased (gnat_field))
6533 ("size of aliased field& must be ^ bits",
6534 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6535 TYPE_SIZE (gnu_field_type));
6537 else if (Strict_Alignment (Etype (gnat_field)))
6539 ("size of & with aliased or tagged components not ^ bits",
6540 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6541 TYPE_SIZE (gnu_field_type));
6543 gnu_size = NULL_TREE;
6546 if (!integer_zerop (size_binop
6547 (TRUNC_MOD_EXPR, gnu_pos,
6548 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6550 if (Is_Aliased (gnat_field))
6552 ("position of aliased field& must be multiple of ^ bits",
6553 First_Bit (Component_Clause (gnat_field)), gnat_field,
6554 TYPE_ALIGN (gnu_field_type));
6556 else if (Treat_As_Volatile (gnat_field))
6558 ("position of volatile field& must be multiple of ^ bits",
6559 First_Bit (Component_Clause (gnat_field)), gnat_field,
6560 TYPE_ALIGN (gnu_field_type));
6562 else if (Strict_Alignment (Etype (gnat_field)))
6564 ("position of & with aliased or tagged components not multiple of ^ bits",
6565 First_Bit (Component_Clause (gnat_field)), gnat_field,
6566 TYPE_ALIGN (gnu_field_type));
6571 gnu_pos = NULL_TREE;
6575 if (Is_Atomic (gnat_field))
6576 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6579 /* If the record has rep clauses and this is the tag field, make a rep
6580 clause for it as well. */
6581 else if (Has_Specified_Layout (Scope (gnat_field))
6582 && Chars (gnat_field) == Name_uTag)
6584 gnu_pos = bitsize_zero_node;
6585 gnu_size = TYPE_SIZE (gnu_field_type);
6589 gnu_pos = NULL_TREE;
6591 /* We need to make the size the maximum for the type if it is
6592 self-referential and an unconstrained type. In that case, we can't
6593 pack the field since we can't make a copy to align it. */
6594 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6596 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6597 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6599 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6603 /* If a size is specified, adjust the field's type to it. */
6606 /* If the field's type is justified modular, we would need to remove
6607 the wrapper to (better) meet the layout requirements. However we
6608 can do so only if the field is not aliased to preserve the unique
6609 layout and if the prescribed size is not greater than that of the
6610 packed array to preserve the justification. */
6611 if (!needs_strict_alignment
6612 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6613 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6614 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6616 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6619 = make_type_from_size (gnu_field_type, gnu_size,
6620 Has_Biased_Representation (gnat_field));
6621 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6622 "PAD", false, definition, true);
6625 /* Otherwise (or if there was an error), don't specify a position. */
6627 gnu_pos = NULL_TREE;
6629 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6630 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6632 /* Now create the decl for the field. */
6633 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6634 packed, gnu_size, gnu_pos,
6635 Is_Aliased (gnat_field));
6636 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6637 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6639 if (Ekind (gnat_field) == E_Discriminant)
6640 DECL_DISCRIMINANT_NUMBER (gnu_field)
6641 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6646 /* Return true if TYPE is a type with variable size, a padding type with a
6647 field of variable size or is a record that has a field such a field. */
6650 is_variable_size (tree type)
6654 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6657 if (TREE_CODE (type) == RECORD_TYPE
6658 && TYPE_IS_PADDING_P (type)
6659 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6662 if (TREE_CODE (type) != RECORD_TYPE
6663 && TREE_CODE (type) != UNION_TYPE
6664 && TREE_CODE (type) != QUAL_UNION_TYPE)
6667 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6668 if (is_variable_size (TREE_TYPE (field)))
6674 /* qsort comparer for the bit positions of two record components. */
6677 compare_field_bitpos (const PTR rt1, const PTR rt2)
6679 const_tree const field1 = * (const_tree const *) rt1;
6680 const_tree const field2 = * (const_tree const *) rt2;
6682 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6684 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6687 /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set
6688 the result as the field list of GNU_RECORD_TYPE and finish it up. When
6689 called from gnat_to_gnu_entity during the processing of a record type
6690 definition, the GCC node for the parent, if any, will be the single field
6691 of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the
6692 GNU_FIELD_LIST. The other calls to this function are recursive calls for
6693 the component list of a variant and, in this case, GNU_FIELD_LIST is empty.
6695 PACKED is 1 if this is for a packed record, -1 if this is for a record
6696 with Component_Alignment of Storage_Unit, -2 if this is for a record
6697 with a specified alignment.
6699 DEFINITION is true if we are defining this record.
6701 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6702 with a rep clause is to be added; in this case, that is all that should
6703 be done with such fields.
6705 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6706 laying out the record. This means the alignment only serves to force
6707 fields to be bitfields, but not require the record to be that aligned.
6708 This is used for variants.
6710 ALL_REP, if true, means a rep clause was found for all the fields. This
6711 simplifies the logic since we know we're not in the mixed case.
6713 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6714 modified afterwards so it will not be finalized here.
6716 UNCHECKED_UNION, if true, means that we are building a type for a record
6717 with a Pragma Unchecked_Union. */
6720 components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
6721 tree gnu_field_list, int packed, bool definition,
6722 tree *p_gnu_rep_list, bool cancel_alignment,
6723 bool all_rep, bool do_not_finalize, bool unchecked_union)
6725 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6726 bool layout_with_rep = false;
6727 Node_Id component_decl, variant_part;
6728 tree gnu_our_rep_list = NULL_TREE;
6729 tree gnu_field, gnu_next, gnu_last = tree_last (gnu_field_list);
6731 /* For each component referenced in a component declaration create a GCC
6732 field and add it to the list, skipping pragmas in the GNAT list. */
6733 if (Present (Component_Items (gnat_component_list)))
6735 = First_Non_Pragma (Component_Items (gnat_component_list));
6736 Present (component_decl);
6737 component_decl = Next_Non_Pragma (component_decl))
6739 Entity_Id gnat_field = Defining_Entity (component_decl);
6740 Name_Id gnat_name = Chars (gnat_field);
6742 /* If present, the _Parent field must have been created as the single
6743 field of the record type. Put it before any other fields. */
6744 if (gnat_name == Name_uParent)
6746 gnu_field = TYPE_FIELDS (gnu_record_type);
6747 gnu_field_list = chainon (gnu_field_list, gnu_field);
6751 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6752 packed, definition);
6754 /* If this is the _Tag field, put it before any other fields. */
6755 if (gnat_name == Name_uTag)
6756 gnu_field_list = chainon (gnu_field_list, gnu_field);
6758 /* If this is the _Controller field, put it before the other
6759 fields except for the _Tag or _Parent field. */
6760 else if (gnat_name == Name_uController && gnu_last)
6762 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
6763 TREE_CHAIN (gnu_last) = gnu_field;
6766 /* If this is a regular field, put it after the other fields. */
6769 TREE_CHAIN (gnu_field) = gnu_field_list;
6770 gnu_field_list = gnu_field;
6772 gnu_last = gnu_field;
6776 save_gnu_tree (gnat_field, gnu_field, false);
6779 /* At the end of the component list there may be a variant part. */
6780 variant_part = Variant_Part (gnat_component_list);
6782 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6783 mutually exclusive and should go in the same memory. To do this we need
6784 to treat each variant as a record whose elements are created from the
6785 component list for the variant. So here we create the records from the
6786 lists for the variants and put them all into the QUAL_UNION_TYPE.
6787 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6788 use GNU_RECORD_TYPE if there are no fields so far. */
6789 if (Present (variant_part))
6791 Node_Id gnat_discr = Name (variant_part), variant;
6792 tree gnu_discr = gnat_to_gnu (gnat_discr);
6793 tree gnu_name = TYPE_NAME (gnu_record_type);
6795 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6797 tree gnu_union_type, gnu_union_name, gnu_union_field;
6798 tree gnu_variant_list = NULL_TREE;
6800 if (TREE_CODE (gnu_name) == TYPE_DECL)
6801 gnu_name = DECL_NAME (gnu_name);
6804 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6806 /* Reuse an enclosing union if all fields are in the variant part
6807 and there is no representation clause on the record, to match
6808 the layout of C unions. There is an associated check below. */
6810 && TREE_CODE (gnu_record_type) == UNION_TYPE
6811 && !TYPE_PACKED (gnu_record_type))
6812 gnu_union_type = gnu_record_type;
6816 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6818 TYPE_NAME (gnu_union_type) = gnu_union_name;
6819 TYPE_ALIGN (gnu_union_type) = 0;
6820 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6823 for (variant = First_Non_Pragma (Variants (variant_part));
6825 variant = Next_Non_Pragma (variant))
6827 tree gnu_variant_type = make_node (RECORD_TYPE);
6828 tree gnu_inner_name;
6831 Get_Variant_Encoding (variant);
6832 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6833 TYPE_NAME (gnu_variant_type)
6834 = concat_name (gnu_union_name,
6835 IDENTIFIER_POINTER (gnu_inner_name));
6837 /* Set the alignment of the inner type in case we need to make
6838 inner objects into bitfields, but then clear it out so the
6839 record actually gets only the alignment required. */
6840 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6841 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6843 /* Similarly, if the outer record has a size specified and all
6844 fields have record rep clauses, we can propagate the size
6845 into the variant part. */
6846 if (all_rep_and_size)
6848 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6849 TYPE_SIZE_UNIT (gnu_variant_type)
6850 = TYPE_SIZE_UNIT (gnu_record_type);
6853 /* Add the fields into the record type for the variant. Note that we
6854 defer finalizing it until after we are sure to really use it. */
6855 components_to_record (gnu_variant_type, Component_List (variant),
6856 NULL_TREE, packed, definition,
6857 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6858 true, unchecked_union);
6860 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6862 Set_Present_Expr (variant, annotate_value (gnu_qual));
6864 /* If this is an Unchecked_Union and we have exactly one field,
6865 use this field directly to match the layout of C unions. */
6867 && TYPE_FIELDS (gnu_variant_type)
6868 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6869 gnu_field = TYPE_FIELDS (gnu_variant_type);
6872 /* Deal with packedness like in gnat_to_gnu_field. */
6874 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6876 /* Finalize the record type now. We used to throw away
6877 empty records but we no longer do that because we need
6878 them to generate complete debug info for the variant;
6879 otherwise, the union type definition will be lacking
6880 the fields associated with these empty variants. */
6881 rest_of_record_type_compilation (gnu_variant_type);
6883 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6884 gnu_union_type, field_packed,
6886 ? TYPE_SIZE (gnu_variant_type)
6889 ? bitsize_zero_node : 0),
6892 DECL_INTERNAL_P (gnu_field) = 1;
6894 if (!unchecked_union)
6895 DECL_QUALIFIER (gnu_field) = gnu_qual;
6898 TREE_CHAIN (gnu_field) = gnu_variant_list;
6899 gnu_variant_list = gnu_field;
6902 /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */
6903 if (gnu_variant_list)
6905 int union_field_packed;
6907 if (all_rep_and_size)
6909 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6910 TYPE_SIZE_UNIT (gnu_union_type)
6911 = TYPE_SIZE_UNIT (gnu_record_type);
6914 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6915 all_rep_and_size ? 1 : 0, false);
6917 /* If GNU_UNION_TYPE is our record type, it means we must have an
6918 Unchecked_Union with no fields. Verify that and, if so, just
6920 if (gnu_union_type == gnu_record_type)
6922 gcc_assert (unchecked_union
6924 && !gnu_our_rep_list);
6928 /* Deal with packedness like in gnat_to_gnu_field. */
6930 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6933 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6935 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6936 all_rep ? bitsize_zero_node : 0, 0);
6938 DECL_INTERNAL_P (gnu_union_field) = 1;
6939 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6940 gnu_field_list = gnu_union_field;
6944 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6945 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do
6946 this in a separate pass since we want to handle the discriminants but
6947 can't play with them until we've used them in debugging data above.
6949 ??? If we then reorder them, debugging information will be wrong but
6950 there's nothing that can be done about this at the moment. */
6951 gnu_last = NULL_TREE;
6952 for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next)
6954 gnu_next = TREE_CHAIN (gnu_field);
6956 if (DECL_FIELD_OFFSET (gnu_field))
6959 gnu_field_list = gnu_next;
6961 TREE_CHAIN (gnu_last) = gnu_next;
6963 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6964 gnu_our_rep_list = gnu_field;
6967 gnu_last = gnu_field;
6970 /* If we have any fields in our rep'ed field list and it is not the case that
6971 all the fields in the record have rep clauses and P_REP_LIST is nonzero,
6972 set it and ignore these fields. */
6973 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6974 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6976 /* Otherwise, sort the fields by bit position and put them into their own
6977 record, before the others, if we also have fields without rep clauses. */
6978 else if (gnu_our_rep_list)
6981 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6982 int i, len = list_length (gnu_our_rep_list);
6983 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6985 for (gnu_field = gnu_our_rep_list, i = 0;
6987 gnu_field = TREE_CHAIN (gnu_field), i++)
6988 gnu_arr[i] = gnu_field;
6990 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6992 /* Put the fields in the list in order of increasing position, which
6993 means we start from the end. */
6994 gnu_our_rep_list = NULL_TREE;
6995 for (i = len - 1; i >= 0; i--)
6997 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6998 gnu_our_rep_list = gnu_arr[i];
6999 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
7004 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
7006 = create_field_decl (get_identifier ("REP"), gnu_rep_type,
7007 gnu_record_type, 0, NULL_TREE, NULL_TREE, 1);
7008 DECL_INTERNAL_P (gnu_field) = 1;
7009 gnu_field_list = chainon (gnu_field_list, gnu_field);
7013 layout_with_rep = true;
7014 gnu_field_list = nreverse (gnu_our_rep_list);
7018 if (cancel_alignment)
7019 TYPE_ALIGN (gnu_record_type) = 0;
7021 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
7022 layout_with_rep ? 1 : 0, do_not_finalize);
7025 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
7026 placed into an Esize, Component_Bit_Offset, or Component_Size value
7027 in the GNAT tree. */
7030 annotate_value (tree gnu_size)
7032 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
7034 Node_Ref_Or_Val ops[3], ret;
7037 struct tree_int_map **h = NULL;
7039 /* See if we've already saved the value for this node. */
7040 if (EXPR_P (gnu_size))
7042 struct tree_int_map in;
7043 if (!annotate_value_cache)
7044 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
7045 tree_int_map_eq, 0);
7046 in.base.from = gnu_size;
7047 h = (struct tree_int_map **)
7048 htab_find_slot (annotate_value_cache, &in, INSERT);
7051 return (Node_Ref_Or_Val) (*h)->to;
7054 /* If we do not return inside this switch, TCODE will be set to the
7055 code to use for a Create_Node operand and LEN (set above) will be
7056 the number of recursive calls for us to make. */
7058 switch (TREE_CODE (gnu_size))
7061 if (TREE_OVERFLOW (gnu_size))
7064 /* This may have come from a conversion from some smaller type,
7065 so ensure this is in bitsizetype. */
7066 gnu_size = convert (bitsizetype, gnu_size);
7068 /* For negative values, use NEGATE_EXPR of the supplied value. */
7069 if (tree_int_cst_sgn (gnu_size) < 0)
7071 /* The ridiculous code below is to handle the case of the largest
7072 negative integer. */
7073 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
7074 bool adjust = false;
7077 if (TREE_OVERFLOW (negative_size))
7080 = size_binop (MINUS_EXPR, bitsize_zero_node,
7081 size_binop (PLUS_EXPR, gnu_size,
7086 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
7088 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
7090 return annotate_value (temp);
7093 if (!host_integerp (gnu_size, 1))
7096 size = tree_low_cst (gnu_size, 1);
7098 /* This peculiar test is to make sure that the size fits in an int
7099 on machines where HOST_WIDE_INT is not "int". */
7100 if (tree_low_cst (gnu_size, 1) == size)
7101 return UI_From_Int (size);
7106 /* The only case we handle here is a simple discriminant reference. */
7107 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
7108 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
7109 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7110 return Create_Node (Discrim_Val,
7111 annotate_value (DECL_DISCRIMINANT_NUMBER
7112 (TREE_OPERAND (gnu_size, 1))),
7117 CASE_CONVERT: case NON_LVALUE_EXPR:
7118 return annotate_value (TREE_OPERAND (gnu_size, 0));
7120 /* Now just list the operations we handle. */
7121 case COND_EXPR: tcode = Cond_Expr; break;
7122 case PLUS_EXPR: tcode = Plus_Expr; break;
7123 case MINUS_EXPR: tcode = Minus_Expr; break;
7124 case MULT_EXPR: tcode = Mult_Expr; break;
7125 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7126 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7127 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7128 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7129 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7130 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7131 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7132 case NEGATE_EXPR: tcode = Negate_Expr; break;
7133 case MIN_EXPR: tcode = Min_Expr; break;
7134 case MAX_EXPR: tcode = Max_Expr; break;
7135 case ABS_EXPR: tcode = Abs_Expr; break;
7136 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7137 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7138 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7139 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7140 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7141 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7142 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7143 case LT_EXPR: tcode = Lt_Expr; break;
7144 case LE_EXPR: tcode = Le_Expr; break;
7145 case GT_EXPR: tcode = Gt_Expr; break;
7146 case GE_EXPR: tcode = Ge_Expr; break;
7147 case EQ_EXPR: tcode = Eq_Expr; break;
7148 case NE_EXPR: tcode = Ne_Expr; break;
7154 /* Now get each of the operands that's relevant for this code. If any
7155 cannot be expressed as a repinfo node, say we can't. */
7156 for (i = 0; i < 3; i++)
7159 for (i = 0; i < len; i++)
7161 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7162 if (ops[i] == No_Uint)
7166 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7168 /* Save the result in the cache. */
7171 *h = GGC_NEW (struct tree_int_map);
7172 (*h)->base.from = gnu_size;
7179 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
7180 GCC type, set Component_Bit_Offset and Esize to the position and size
7184 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7188 Entity_Id gnat_field;
7190 /* We operate by first making a list of all fields and their positions
7191 (we can get the sizes easily at any time) by a recursive call
7192 and then update all the sizes into the tree. */
7193 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
7194 size_zero_node, bitsize_zero_node,
7197 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
7198 gnat_field = Next_Entity (gnat_field))
7199 if ((Ekind (gnat_field) == E_Component
7200 || (Ekind (gnat_field) == E_Discriminant
7201 && !Is_Unchecked_Union (Scope (gnat_field)))))
7203 tree parent_offset = bitsize_zero_node;
7205 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
7210 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7212 /* In this mode the tag and parent components have not been
7213 generated, so we add the appropriate offset to each
7214 component. For a component appearing in the current
7215 extension, the offset is the size of the parent. */
7216 if (Is_Derived_Type (gnat_entity)
7217 && Original_Record_Component (gnat_field) == gnat_field)
7219 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7222 parent_offset = bitsize_int (POINTER_SIZE);
7225 Set_Component_Bit_Offset
7228 (size_binop (PLUS_EXPR,
7229 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
7230 TREE_VALUE (TREE_VALUE
7231 (TREE_VALUE (gnu_entry)))),
7234 Set_Esize (gnat_field,
7235 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
7237 else if (Is_Tagged_Type (gnat_entity)
7238 && Is_Derived_Type (gnat_entity))
7240 /* If there is no gnu_entry, this is an inherited component whose
7241 position is the same as in the parent type. */
7242 Set_Component_Bit_Offset
7244 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7245 Set_Esize (gnat_field,
7246 Esize (Original_Record_Component (gnat_field)));
7251 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
7252 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
7253 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
7254 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
7255 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
7256 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
7260 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
7261 tree gnu_bitpos, unsigned int offset_align)
7264 tree gnu_result = gnu_list;
7266 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
7267 gnu_field = TREE_CHAIN (gnu_field))
7269 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7270 DECL_FIELD_BIT_OFFSET (gnu_field));
7271 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7272 DECL_FIELD_OFFSET (gnu_field));
7273 unsigned int our_offset_align
7274 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7277 = tree_cons (gnu_field,
7278 tree_cons (gnu_our_offset,
7279 tree_cons (size_int (our_offset_align),
7280 gnu_our_bitpos, NULL_TREE),
7284 if (DECL_INTERNAL_P (gnu_field))
7286 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
7287 gnu_our_offset, gnu_our_bitpos,
7294 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7295 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7296 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7297 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7298 for the size of a field. COMPONENT_P is true if we are being called
7299 to process the Component_Size of GNAT_OBJECT. This is used for error
7300 message handling and to indicate to use the object size of GNU_TYPE.
7301 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7302 it means that a size of zero should be treated as an unspecified size. */
7305 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7306 enum tree_code kind, bool component_p, bool zero_ok)
7308 Node_Id gnat_error_node;
7309 tree type_size, size;
7311 if (kind == VAR_DECL
7312 /* If a type needs strict alignment, a component of this type in
7313 a packed record cannot be packed and thus uses the type size. */
7314 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7315 type_size = TYPE_SIZE (gnu_type);
7317 type_size = rm_size (gnu_type);
7319 /* Find the node to use for errors. */
7320 if ((Ekind (gnat_object) == E_Component
7321 || Ekind (gnat_object) == E_Discriminant)
7322 && Present (Component_Clause (gnat_object)))
7323 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7324 else if (Present (Size_Clause (gnat_object)))
7325 gnat_error_node = Expression (Size_Clause (gnat_object));
7327 gnat_error_node = gnat_object;
7329 /* Return 0 if no size was specified, either because Esize was not Present
7330 or the specified size was zero. */
7331 if (No (uint_size) || uint_size == No_Uint)
7334 /* Get the size as a tree. Issue an error if a size was specified but
7335 cannot be represented in sizetype. */
7336 size = UI_To_gnu (uint_size, bitsizetype);
7337 if (TREE_OVERFLOW (size))
7339 post_error_ne (component_p ? "component size of & is too large"
7340 : "size of & is too large",
7341 gnat_error_node, gnat_object);
7345 /* Ignore a negative size since that corresponds to our back-annotation.
7346 Also ignore a zero size if it is not permitted. */
7347 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7350 /* The size of objects is always a multiple of a byte. */
7351 if (kind == VAR_DECL
7352 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7355 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7356 gnat_error_node, gnat_object);
7358 post_error_ne ("size for& is not a multiple of Storage_Unit",
7359 gnat_error_node, gnat_object);
7363 /* If this is an integral type or a packed array type, the front-end has
7364 verified the size, so we need not do it here (which would entail
7365 checking against the bounds). However, if this is an aliased object,
7366 it may not be smaller than the type of the object. */
7367 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7368 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7371 /* If the object is a record that contains a template, add the size of
7372 the template to the specified size. */
7373 if (TREE_CODE (gnu_type) == RECORD_TYPE
7374 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7375 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7377 /* Modify the size of the type to be that of the maximum size if it has a
7379 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7380 type_size = max_size (type_size, true);
7382 /* If this is an access type or a fat pointer, the minimum size is that given
7383 by the smallest integral mode that's valid for pointers. */
7384 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7386 enum machine_mode p_mode;
7388 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7389 !targetm.valid_pointer_mode (p_mode);
7390 p_mode = GET_MODE_WIDER_MODE (p_mode))
7393 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7396 /* If the size of the object is a constant, the new size must not be
7398 if (TREE_CODE (type_size) != INTEGER_CST
7399 || TREE_OVERFLOW (type_size)
7400 || tree_int_cst_lt (size, type_size))
7404 ("component size for& too small{, minimum allowed is ^}",
7405 gnat_error_node, gnat_object, type_size);
7407 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7408 gnat_error_node, gnat_object, type_size);
7410 if (kind == VAR_DECL && !component_p
7411 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7412 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7413 post_error_ne_tree_2
7414 ("\\size of ^ is not a multiple of alignment (^ bits)",
7415 gnat_error_node, gnat_object, rm_size (gnu_type),
7416 TYPE_ALIGN (gnu_type));
7418 else if (INTEGRAL_TYPE_P (gnu_type))
7419 post_error_ne ("\\size would be legal if & were not aliased!",
7420 gnat_error_node, gnat_object);
7428 /* Similarly, but both validate and process a value of RM size. This
7429 routine is only called for types. */
7432 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7434 /* Only issue an error if a Value_Size clause was explicitly given.
7435 Otherwise, we'd be duplicating an error on the Size clause. */
7436 Node_Id gnat_attr_node
7437 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7438 tree old_size = rm_size (gnu_type), size;
7440 /* Do nothing if no size was specified, either because RM size was not
7441 Present or if the specified size was zero. */
7442 if (No (uint_size) || uint_size == No_Uint)
7445 /* Get the size as a tree. Issue an error if a size was specified but
7446 cannot be represented in sizetype. */
7447 size = UI_To_gnu (uint_size, bitsizetype);
7448 if (TREE_OVERFLOW (size))
7450 if (Present (gnat_attr_node))
7451 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7456 /* Ignore a negative size since that corresponds to our back-annotation.
7457 Also ignore a zero size unless a Value_Size clause exists, or a size
7458 clause exists, or this is an integer type, in which case the front-end
7459 will have always set it. */
7460 if (tree_int_cst_sgn (size) < 0
7461 || (integer_zerop (size)
7462 && No (gnat_attr_node)
7463 && !Has_Size_Clause (gnat_entity)
7464 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7467 /* If the old size is self-referential, get the maximum size. */
7468 if (CONTAINS_PLACEHOLDER_P (old_size))
7469 old_size = max_size (old_size, true);
7471 /* If the size of the object is a constant, the new size must not be smaller
7472 (the front-end has verified this for scalar and packed array types). */
7473 if (TREE_CODE (old_size) != INTEGER_CST
7474 || TREE_OVERFLOW (old_size)
7475 || (AGGREGATE_TYPE_P (gnu_type)
7476 && !(TREE_CODE (gnu_type) == ARRAY_TYPE
7477 && TYPE_PACKED_ARRAY_TYPE_P (gnu_type))
7478 && !(TREE_CODE (gnu_type) == RECORD_TYPE
7479 && TYPE_IS_PADDING_P (gnu_type)
7480 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE
7481 && TYPE_PACKED_ARRAY_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_type))))
7482 && tree_int_cst_lt (size, old_size)))
7484 if (Present (gnat_attr_node))
7486 ("Value_Size for& too small{, minimum allowed is ^}",
7487 gnat_attr_node, gnat_entity, old_size);
7491 /* Otherwise, set the RM size proper for integral types... */
7492 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7493 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7494 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7495 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7496 SET_TYPE_RM_SIZE (gnu_type, size);
7498 /* ...or the Ada size for record and union types. */
7499 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7500 || TREE_CODE (gnu_type) == UNION_TYPE
7501 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7502 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7503 SET_TYPE_ADA_SIZE (gnu_type, size);
7506 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7507 If TYPE is the best type, return it. Otherwise, make a new type. We
7508 only support new integral and pointer types. FOR_BIASED is true if
7509 we are making a biased type. */
7512 make_type_from_size (tree type, tree size_tree, bool for_biased)
7514 unsigned HOST_WIDE_INT size;
7518 /* If size indicates an error, just return TYPE to avoid propagating
7519 the error. Likewise if it's too large to represent. */
7520 if (!size_tree || !host_integerp (size_tree, 1))
7523 size = tree_low_cst (size_tree, 1);
7525 switch (TREE_CODE (type))
7530 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7531 && TYPE_BIASED_REPRESENTATION_P (type));
7533 /* Only do something if the type is not a packed array type and
7534 doesn't already have the proper size. */
7535 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7536 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7539 biased_p |= for_biased;
7540 if (size > LONG_LONG_TYPE_SIZE)
7541 size = LONG_LONG_TYPE_SIZE;
7543 if (TYPE_UNSIGNED (type) || biased_p)
7544 new_type = make_unsigned_type (size);
7546 new_type = make_signed_type (size);
7547 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7548 SET_TYPE_RM_MIN_VALUE (new_type,
7549 convert (TREE_TYPE (new_type),
7550 TYPE_MIN_VALUE (type)));
7551 SET_TYPE_RM_MAX_VALUE (new_type,
7552 convert (TREE_TYPE (new_type),
7553 TYPE_MAX_VALUE (type)));
7554 /* Propagate the name to avoid creating a fake subrange type. */
7555 if (TYPE_NAME (type))
7557 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7558 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7560 TYPE_NAME (new_type) = TYPE_NAME (type);
7562 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7563 SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
7567 /* Do something if this is a fat pointer, in which case we
7568 may need to return the thin pointer. */
7569 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7571 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7572 if (!targetm.valid_pointer_mode (p_mode))
7575 build_pointer_type_for_mode
7576 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7582 /* Only do something if this is a thin pointer, in which case we
7583 may need to return the fat pointer. */
7584 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7586 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7596 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7597 a type or object whose present alignment is ALIGN. If this alignment is
7598 valid, return it. Otherwise, give an error and return ALIGN. */
7601 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7603 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7604 unsigned int new_align;
7605 Node_Id gnat_error_node;
7607 /* Don't worry about checking alignment if alignment was not specified
7608 by the source program and we already posted an error for this entity. */
7609 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7612 /* Post the error on the alignment clause if any. */
7613 if (Present (Alignment_Clause (gnat_entity)))
7614 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7616 gnat_error_node = gnat_entity;
7618 /* Within GCC, an alignment is an integer, so we must make sure a value is
7619 specified that fits in that range. Also, there is an upper bound to
7620 alignments we can support/allow. */
7621 if (!UI_Is_In_Int_Range (alignment)
7622 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7623 post_error_ne_num ("largest supported alignment for& is ^",
7624 gnat_error_node, gnat_entity, max_allowed_alignment);
7625 else if (!(Present (Alignment_Clause (gnat_entity))
7626 && From_At_Mod (Alignment_Clause (gnat_entity)))
7627 && new_align * BITS_PER_UNIT < align)
7629 unsigned int double_align;
7630 bool is_capped_double, align_clause;
7632 /* If the default alignment of "double" or larger scalar types is
7633 specifically capped and the new alignment is above the cap, do
7634 not post an error and change the alignment only if there is an
7635 alignment clause; this makes it possible to have the associated
7636 GCC type overaligned by default for performance reasons. */
7637 if ((double_align = double_float_alignment) > 0)
7640 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7642 = is_double_float_or_array (gnat_type, &align_clause);
7644 else if ((double_align = double_scalar_alignment) > 0)
7647 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7649 = is_double_scalar_or_array (gnat_type, &align_clause);
7652 is_capped_double = align_clause = false;
7654 if (is_capped_double && new_align >= double_align)
7657 align = new_align * BITS_PER_UNIT;
7661 if (is_capped_double)
7662 align = double_align * BITS_PER_UNIT;
7664 post_error_ne_num ("alignment for& must be at least ^",
7665 gnat_error_node, gnat_entity,
7666 align / BITS_PER_UNIT);
7671 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7672 if (new_align > align)
7679 /* Return the smallest alignment not less than SIZE. */
7682 ceil_alignment (unsigned HOST_WIDE_INT size)
7684 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7687 /* Verify that OBJECT, a type or decl, is something we can implement
7688 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7689 if we require atomic components. */
7692 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7694 Node_Id gnat_error_point = gnat_entity;
7696 enum machine_mode mode;
7700 /* There are three case of what OBJECT can be. It can be a type, in which
7701 case we take the size, alignment and mode from the type. It can be a
7702 declaration that was indirect, in which case the relevant values are
7703 that of the type being pointed to, or it can be a normal declaration,
7704 in which case the values are of the decl. The code below assumes that
7705 OBJECT is either a type or a decl. */
7706 if (TYPE_P (object))
7708 mode = TYPE_MODE (object);
7709 align = TYPE_ALIGN (object);
7710 size = TYPE_SIZE (object);
7712 else if (DECL_BY_REF_P (object))
7714 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7715 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7716 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7720 mode = DECL_MODE (object);
7721 align = DECL_ALIGN (object);
7722 size = DECL_SIZE (object);
7725 /* Consider all floating-point types atomic and any types that that are
7726 represented by integers no wider than a machine word. */
7727 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7728 || ((GET_MODE_CLASS (mode) == MODE_INT
7729 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7730 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7733 /* For the moment, also allow anything that has an alignment equal
7734 to its size and which is smaller than a word. */
7735 if (size && TREE_CODE (size) == INTEGER_CST
7736 && compare_tree_int (size, align) == 0
7737 && align <= BITS_PER_WORD)
7740 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7741 gnat_node = Next_Rep_Item (gnat_node))
7743 if (!comp_p && Nkind (gnat_node) == N_Pragma
7744 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7746 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7747 else if (comp_p && Nkind (gnat_node) == N_Pragma
7748 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7749 == Pragma_Atomic_Components))
7750 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7754 post_error_ne ("atomic access to component of & cannot be guaranteed",
7755 gnat_error_point, gnat_entity);
7757 post_error_ne ("atomic access to & cannot be guaranteed",
7758 gnat_error_point, gnat_entity);
7761 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7762 have compatible signatures so that a call using one type may be safely
7763 issued if the actual target function type is the other. Return 1 if it is
7764 the case, 0 otherwise, and post errors on the incompatibilities.
7766 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7767 that calls to the subprogram will have arguments suitable for the later
7768 underlying builtin expansion. */
7771 compatible_signatures_p (tree ftype1, tree ftype2)
7773 /* As of now, we only perform very trivial tests and consider it's the
7774 programmer's responsibility to ensure the type correctness in the Ada
7775 declaration, as in the regular Import cases.
7777 Mismatches typically result in either error messages from the builtin
7778 expander, internal compiler errors, or in a real call sequence. This
7779 should be refined to issue diagnostics helping error detection and
7782 /* Almost fake test, ensuring a use of each argument. */
7783 if (ftype1 == ftype2)
7789 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
7790 type with all size expressions that contain F in a PLACEHOLDER_EXPR
7791 updated by replacing F with R.
7793 The function doesn't update the layout of the type, i.e. it assumes
7794 that the substitution is purely formal. That's why the replacement
7795 value R must itself contain a PLACEHOLDER_EXPR. */
7798 substitute_in_type (tree t, tree f, tree r)
7802 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
7804 switch (TREE_CODE (t))
7811 /* First the domain types of arrays. */
7812 if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t))
7813 || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t)))
7815 tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r);
7816 tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r);
7818 if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t))
7821 new = copy_type (t);
7822 TYPE_GCC_MIN_VALUE (new) = low;
7823 TYPE_GCC_MAX_VALUE (new) = high;
7825 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t))
7827 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7832 /* Then the subtypes. */
7833 if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t))
7834 || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t)))
7836 tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r);
7837 tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r);
7839 if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t))
7842 new = copy_type (t);
7843 SET_TYPE_RM_MIN_VALUE (new, low);
7844 SET_TYPE_RM_MAX_VALUE (new, high);
7852 new = substitute_in_type (TREE_TYPE (t), f, r);
7853 if (new == TREE_TYPE (t))
7856 return build_complex_type (new);
7862 /* These should never show up here. */
7867 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7868 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7870 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7873 new = build_array_type (component, domain);
7874 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7875 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7876 SET_TYPE_MODE (new, TYPE_MODE (t));
7877 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7878 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7879 TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t);
7880 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7881 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7887 case QUAL_UNION_TYPE:
7889 bool changed_field = false;
7892 /* Start out with no fields, make new fields, and chain them
7893 in. If we haven't actually changed the type of any field,
7894 discard everything we've done and return the old type. */
7895 new = copy_type (t);
7896 TYPE_FIELDS (new) = NULL_TREE;
7898 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7900 tree new_field = copy_node (field), new_n;
7902 new_n = substitute_in_type (TREE_TYPE (field), f, r);
7903 if (new_n != TREE_TYPE (field))
7905 TREE_TYPE (new_field) = new_n;
7906 changed_field = true;
7909 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
7910 if (new_n != DECL_FIELD_OFFSET (field))
7912 DECL_FIELD_OFFSET (new_field) = new_n;
7913 changed_field = true;
7916 /* Do the substitution inside the qualifier, if any. */
7917 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7919 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7920 if (new_n != DECL_QUALIFIER (field))
7922 DECL_QUALIFIER (new_field) = new_n;
7923 changed_field = true;
7927 DECL_CONTEXT (new_field) = new;
7928 SET_DECL_ORIGINAL_FIELD (new_field,
7929 (DECL_ORIGINAL_FIELD (field)
7930 ? DECL_ORIGINAL_FIELD (field) : field));
7932 TREE_CHAIN (new_field) = TYPE_FIELDS (new);
7933 TYPE_FIELDS (new) = new_field;
7939 TYPE_FIELDS (new) = nreverse (TYPE_FIELDS (new));
7940 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7941 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7942 SET_TYPE_ADA_SIZE (new, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
7951 /* Return the RM size of GNU_TYPE. This is the actual number of bits
7952 needed to represent the object. */
7955 rm_size (tree gnu_type)
7957 /* For integral types, we store the RM size explicitly. */
7958 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7959 return TYPE_RM_SIZE (gnu_type);
7961 /* Return the RM size of the actual data plus the size of the template. */
7962 if (TREE_CODE (gnu_type) == RECORD_TYPE
7963 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7965 size_binop (PLUS_EXPR,
7966 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7967 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7969 /* For record types, we store the size explicitly. */
7970 if ((TREE_CODE (gnu_type) == RECORD_TYPE
7971 || TREE_CODE (gnu_type) == UNION_TYPE
7972 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7973 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7974 && TYPE_ADA_SIZE (gnu_type))
7975 return TYPE_ADA_SIZE (gnu_type);
7977 /* For other types, this is just the size. */
7978 return TYPE_SIZE (gnu_type);
7981 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7982 fully-qualified name, possibly with type information encoding.
7983 Otherwise, return the name. */
7986 get_entity_name (Entity_Id gnat_entity)
7988 Get_Encoded_Name (gnat_entity);
7989 return get_identifier_with_length (Name_Buffer, Name_Len);
7992 /* Return an identifier representing the external name to be used for
7993 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7994 and the specified suffix. */
7997 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7999 Entity_Kind kind = Ekind (gnat_entity);
8003 String_Template temp = {1, strlen (suffix)};
8004 Fat_Pointer fp = {suffix, &temp};
8005 Get_External_Name_With_Suffix (gnat_entity, fp);
8008 Get_External_Name (gnat_entity, 0);
8010 /* A variable using the Stdcall convention lives in a DLL. We adjust
8011 its name to use the jump table, the _imp__NAME contains the address
8012 for the NAME variable. */
8013 if ((kind == E_Variable || kind == E_Constant)
8014 && Has_Stdcall_Convention (gnat_entity))
8016 const int len = 6 + Name_Len;
8017 char *new_name = (char *) alloca (len + 1);
8018 strcpy (new_name, "_imp__");
8019 strcat (new_name, Name_Buffer);
8020 return get_identifier_with_length (new_name, len);
8023 return get_identifier_with_length (Name_Buffer, Name_Len);
8026 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
8027 string, return a new IDENTIFIER_NODE that is the concatenation of
8028 the name followed by "___" and the specified suffix. */
8031 concat_name (tree gnu_name, const char *suffix)
8033 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
8034 char *new_name = (char *) alloca (len + 1);
8035 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
8036 strcat (new_name, "___");
8037 strcat (new_name, suffix);
8038 return get_identifier_with_length (new_name, len);
8041 #include "gt-ada-decl.h"
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