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 (VAR_DECL, gnu_entity_name, gnu_type);
578 /* The (MEM (CONST (0))) pattern is prescribed by STABS. */
579 if (global_bindings_p ())
580 addr = gen_rtx_CONST (VOIDmode, const0_rtx);
582 addr = stack_pointer_rtx;
583 SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
584 gnat_pushdecl (gnu_decl, gnat_entity);
588 /* If this is a loop variable, its type should be the base type.
589 This is because the code for processing a loop determines whether
590 a normal loop end test can be done by comparing the bounds of the
591 loop against those of the base type, which is presumed to be the
592 size used for computation. But this is not correct when the size
593 of the subtype is smaller than the type. */
594 if (kind == E_Loop_Parameter)
595 gnu_type = get_base_type (gnu_type);
597 /* Reject non-renamed objects whose types are unconstrained arrays or
598 any object whose type is a dummy type or VOID_TYPE. */
600 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
601 && No (Renamed_Object (gnat_entity)))
602 || TYPE_IS_DUMMY_P (gnu_type)
603 || TREE_CODE (gnu_type) == VOID_TYPE)
605 gcc_assert (type_annotate_only);
608 return error_mark_node;
611 /* If an alignment is specified, use it if valid. Note that exceptions
612 are objects but don't have an alignment. We must do this before we
613 validate the size, since the alignment can affect the size. */
614 if (kind != E_Exception && Known_Alignment (gnat_entity))
616 gcc_assert (Present (Alignment (gnat_entity)));
617 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
618 TYPE_ALIGN (gnu_type));
619 /* No point in changing the type if there is an address clause
620 as the final type of the object will be a reference type. */
621 if (Present (Address_Clause (gnat_entity)))
625 = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity,
626 "PAD", false, definition, true);
629 /* If we are defining the object, see if it has a Size value and
630 validate it if so. If we are not defining the object and a Size
631 clause applies, simply retrieve the value. We don't want to ignore
632 the clause and it is expected to have been validated already. Then
633 get the new type, if any. */
635 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
636 gnat_entity, VAR_DECL, false,
637 Has_Size_Clause (gnat_entity));
638 else if (Has_Size_Clause (gnat_entity))
639 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
644 = make_type_from_size (gnu_type, gnu_size,
645 Has_Biased_Representation (gnat_entity));
647 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
648 gnu_size = NULL_TREE;
651 /* If this object has self-referential size, it must be a record with
652 a default value. We are supposed to allocate an object of the
653 maximum size in this case unless it is a constant with an
654 initializing expression, in which case we can get the size from
655 that. Note that the resulting size may still be a variable, so
656 this may end up with an indirect allocation. */
657 if (No (Renamed_Object (gnat_entity))
658 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
660 if (gnu_expr && kind == E_Constant)
662 tree size = TYPE_SIZE (TREE_TYPE (gnu_expr));
663 if (CONTAINS_PLACEHOLDER_P (size))
665 /* If the initializing expression is itself a constant,
666 despite having a nominal type with self-referential
667 size, we can get the size directly from it. */
668 if (TREE_CODE (gnu_expr) == COMPONENT_REF
669 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
672 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
673 && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL
674 && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0))
675 || DECL_READONLY_ONCE_ELAB
676 (TREE_OPERAND (gnu_expr, 0))))
677 gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0));
680 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr);
685 /* We may have no GNU_EXPR because No_Initialization is
686 set even though there's an Expression. */
687 else if (kind == E_Constant
688 && (Nkind (Declaration_Node (gnat_entity))
689 == N_Object_Declaration)
690 && Present (Expression (Declaration_Node (gnat_entity))))
692 = TYPE_SIZE (gnat_to_gnu_type
694 (Expression (Declaration_Node (gnat_entity)))));
697 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
702 /* If the size is zero bytes, make it one byte since some linkers have
703 trouble with zero-sized objects. If the object will have a
704 template, that will make it nonzero so don't bother. Also avoid
705 doing that for an object renaming or an object with an address
706 clause, as we would lose useful information on the view size
707 (e.g. for null array slices) and we are not allocating the object
710 && integer_zerop (gnu_size)
711 && !TREE_OVERFLOW (gnu_size))
712 || (TYPE_SIZE (gnu_type)
713 && integer_zerop (TYPE_SIZE (gnu_type))
714 && !TREE_OVERFLOW (TYPE_SIZE (gnu_type))))
715 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
716 || !Is_Array_Type (Etype (gnat_entity)))
717 && No (Renamed_Object (gnat_entity))
718 && No (Address_Clause (gnat_entity)))
719 gnu_size = bitsize_unit_node;
721 /* If this is an object with no specified size and alignment, and
722 if either it is atomic or we are not optimizing alignment for
723 space and it is composite and not an exception, an Out parameter
724 or a reference to another object, and the size of its type is a
725 constant, set the alignment to the smallest one which is not
726 smaller than the size, with an appropriate cap. */
727 if (!gnu_size && align == 0
728 && (Is_Atomic (gnat_entity)
729 || (!Optimize_Alignment_Space (gnat_entity)
730 && kind != E_Exception
731 && kind != E_Out_Parameter
732 && Is_Composite_Type (Etype (gnat_entity))
733 && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
735 && No (Renamed_Object (gnat_entity))
736 && No (Address_Clause (gnat_entity))))
737 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
739 /* No point in jumping through all the hoops needed in order
740 to support BIGGEST_ALIGNMENT if we don't really have to.
741 So we cap to the smallest alignment that corresponds to
742 a known efficient memory access pattern of the target. */
743 unsigned int align_cap = Is_Atomic (gnat_entity)
745 : get_mode_alignment (ptr_mode);
747 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
748 || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0)
751 align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1));
753 /* But make sure not to under-align the object. */
754 if (align <= TYPE_ALIGN (gnu_type))
757 /* And honor the minimum valid atomic alignment, if any. */
758 #ifdef MINIMUM_ATOMIC_ALIGNMENT
759 else if (align < MINIMUM_ATOMIC_ALIGNMENT)
760 align = MINIMUM_ATOMIC_ALIGNMENT;
764 /* If the object is set to have atomic components, find the component
765 type and validate it.
767 ??? Note that we ignore Has_Volatile_Components on objects; it's
768 not at all clear what to do in that case. */
770 if (Has_Atomic_Components (gnat_entity))
772 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
773 ? TREE_TYPE (gnu_type) : gnu_type);
775 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
776 && TYPE_MULTI_ARRAY_P (gnu_inner))
777 gnu_inner = TREE_TYPE (gnu_inner);
779 check_ok_for_atomic (gnu_inner, gnat_entity, true);
782 /* Now check if the type of the object allows atomic access. Note
783 that we must test the type, even if this object has size and
784 alignment to allow such access, because we will be going
785 inside the padded record to assign to the object. We could fix
786 this by always copying via an intermediate value, but it's not
787 clear it's worth the effort. */
788 if (Is_Atomic (gnat_entity))
789 check_ok_for_atomic (gnu_type, gnat_entity, false);
791 /* If this is an aliased object with an unconstrained nominal subtype,
792 make a type that includes the template. */
793 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
794 && Is_Array_Type (Etype (gnat_entity))
795 && !type_annotate_only)
798 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
801 = build_unc_object_type_from_ptr (gnu_fat, gnu_type,
802 concat_name (gnu_entity_name,
806 #ifdef MINIMUM_ATOMIC_ALIGNMENT
807 /* If the size is a constant and no alignment is specified, force
808 the alignment to be the minimum valid atomic alignment. The
809 restriction on constant size avoids problems with variable-size
810 temporaries; if the size is variable, there's no issue with
811 atomic access. Also don't do this for a constant, since it isn't
812 necessary and can interfere with constant replacement. Finally,
813 do not do it for Out parameters since that creates an
814 size inconsistency with In parameters. */
815 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
816 && !FLOAT_TYPE_P (gnu_type)
817 && !const_flag && No (Renamed_Object (gnat_entity))
818 && !imported_p && No (Address_Clause (gnat_entity))
819 && kind != E_Out_Parameter
820 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
821 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
822 align = MINIMUM_ATOMIC_ALIGNMENT;
825 /* Make a new type with the desired size and alignment, if needed.
826 But do not take into account alignment promotions to compute the
827 size of the object. */
828 gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type);
829 if (gnu_size || align > 0)
830 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
831 "PAD", false, definition,
832 gnu_size ? true : false);
834 /* If this is a renaming, avoid as much as possible to create a new
835 object. However, in several cases, creating it is required.
836 This processing needs to be applied to the raw expression so
837 as to make it more likely to rename the underlying object. */
838 if (Present (Renamed_Object (gnat_entity)))
840 bool create_normal_object = false;
842 /* If the renamed object had padding, strip off the reference
843 to the inner object and reset our type. */
844 if ((TREE_CODE (gnu_expr) == COMPONENT_REF
845 && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
847 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))
848 /* Strip useless conversions around the object. */
849 || (TREE_CODE (gnu_expr) == NOP_EXPR
850 && gnat_types_compatible_p
851 (TREE_TYPE (gnu_expr),
852 TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
854 gnu_expr = TREE_OPERAND (gnu_expr, 0);
855 gnu_type = TREE_TYPE (gnu_expr);
858 /* Case 1: If this is a constant renaming stemming from a function
859 call, treat it as a normal object whose initial value is what
860 is being renamed. RM 3.3 says that the result of evaluating a
861 function call is a constant object. As a consequence, it can
862 be the inner object of a constant renaming. In this case, the
863 renaming must be fully instantiated, i.e. it cannot be a mere
864 reference to (part of) an existing object. */
867 tree inner_object = gnu_expr;
868 while (handled_component_p (inner_object))
869 inner_object = TREE_OPERAND (inner_object, 0);
870 if (TREE_CODE (inner_object) == CALL_EXPR)
871 create_normal_object = true;
874 /* Otherwise, see if we can proceed with a stabilized version of
875 the renamed entity or if we need to make a new object. */
876 if (!create_normal_object)
878 tree maybe_stable_expr = NULL_TREE;
881 /* Case 2: If the renaming entity need not be materialized and
882 the renamed expression is something we can stabilize, use
883 that for the renaming. At the global level, we can only do
884 this if we know no SAVE_EXPRs need be made, because the
885 expression we return might be used in arbitrary conditional
886 branches so we must force the SAVE_EXPRs evaluation
887 immediately and this requires a function context. */
888 if (!Materialize_Entity (gnat_entity)
889 && (!global_bindings_p ()
890 || (staticp (gnu_expr)
891 && !TREE_SIDE_EFFECTS (gnu_expr))))
894 = maybe_stabilize_reference (gnu_expr, true, &stable);
898 gnu_decl = maybe_stable_expr;
899 /* ??? No DECL_EXPR is created so we need to mark
900 the expression manually lest it is shared. */
901 if (global_bindings_p ())
902 mark_visited (&gnu_decl);
903 save_gnu_tree (gnat_entity, gnu_decl, true);
908 /* The stabilization failed. Keep maybe_stable_expr
909 untouched here to let the pointer case below know
910 about that failure. */
913 /* Case 3: If this is a constant renaming and creating a
914 new object is allowed and cheap, treat it as a normal
915 object whose initial value is what is being renamed. */
917 && !Is_Composite_Type
918 (Underlying_Type (Etype (gnat_entity))))
921 /* Case 4: Make this into a constant pointer to the object we
922 are to rename and attach the object to the pointer if it is
923 something we can stabilize.
925 From the proper scope, attached objects will be referenced
926 directly instead of indirectly via the pointer to avoid
927 subtle aliasing problems with non-addressable entities.
928 They have to be stable because we must not evaluate the
929 variables in the expression every time the renaming is used.
930 The pointer is called a "renaming" pointer in this case.
932 In the rare cases where we cannot stabilize the renamed
933 object, we just make a "bare" pointer, and the renamed
934 entity is always accessed indirectly through it. */
937 gnu_type = build_reference_type (gnu_type);
938 inner_const_flag = TREE_READONLY (gnu_expr);
941 /* If the previous attempt at stabilizing failed, there
942 is no point in trying again and we reuse the result
943 without attaching it to the pointer. In this case it
944 will only be used as the initializing expression of
945 the pointer and thus needs no special treatment with
946 regard to multiple evaluations. */
947 if (maybe_stable_expr)
950 /* Otherwise, try to stabilize and attach the expression
951 to the pointer if the stabilization succeeds.
953 Note that this might introduce SAVE_EXPRs and we don't
954 check whether we're at the global level or not. This
955 is fine since we are building a pointer initializer and
956 neither the pointer nor the initializing expression can
957 be accessed before the pointer elaboration has taken
958 place in a correct program.
960 These SAVE_EXPRs will be evaluated at the right place
961 by either the evaluation of the initializer for the
962 non-global case or the elaboration code for the global
963 case, and will be attached to the elaboration procedure
964 in the latter case. */
968 = maybe_stabilize_reference (gnu_expr, true, &stable);
971 renamed_obj = maybe_stable_expr;
973 /* Attaching is actually performed downstream, as soon
974 as we have a VAR_DECL for the pointer we make. */
978 = build_unary_op (ADDR_EXPR, gnu_type, maybe_stable_expr);
980 gnu_size = NULL_TREE;
986 /* Make a volatile version of this object's type if we are to make
987 the object volatile. We also interpret 13.3(19) conservatively
988 and disallow any optimizations for such a non-constant object. */
989 if ((Treat_As_Volatile (gnat_entity)
991 && (Is_Exported (gnat_entity)
992 || Is_Imported (gnat_entity)
993 || Present (Address_Clause (gnat_entity)))))
994 && !TYPE_VOLATILE (gnu_type))
995 gnu_type = build_qualified_type (gnu_type,
996 (TYPE_QUALS (gnu_type)
997 | TYPE_QUAL_VOLATILE));
999 /* If we are defining an aliased object whose nominal subtype is
1000 unconstrained, the object is a record that contains both the
1001 template and the object. If there is an initializer, it will
1002 have already been converted to the right type, but we need to
1003 create the template if there is no initializer. */
1006 && TREE_CODE (gnu_type) == RECORD_TYPE
1007 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
1008 /* Beware that padding might have been introduced
1009 via maybe_pad_type above. */
1010 || (TYPE_IS_PADDING_P (gnu_type)
1011 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1013 && TYPE_CONTAINS_TEMPLATE_P
1014 (TREE_TYPE (TYPE_FIELDS (gnu_type))))))
1017 = TYPE_IS_PADDING_P (gnu_type)
1018 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
1019 : TYPE_FIELDS (gnu_type);
1022 = gnat_build_constructor
1026 build_template (TREE_TYPE (template_field),
1027 TREE_TYPE (TREE_CHAIN (template_field)),
1032 /* Convert the expression to the type of the object except in the
1033 case where the object's type is unconstrained or the object's type
1034 is a padded record whose field is of self-referential size. In
1035 the former case, converting will generate unnecessary evaluations
1036 of the CONSTRUCTOR to compute the size and in the latter case, we
1037 want to only copy the actual data. */
1039 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1040 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1041 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1042 && TYPE_IS_PADDING_P (gnu_type)
1043 && (CONTAINS_PLACEHOLDER_P
1044 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1045 gnu_expr = convert (gnu_type, gnu_expr);
1047 /* If this is a pointer and it does not have an initializing
1048 expression, initialize it to NULL, unless the object is
1051 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
1052 && !Is_Imported (gnat_entity) && !gnu_expr)
1053 gnu_expr = integer_zero_node;
1055 /* If we are defining the object and it has an Address clause, we must
1056 either get the address expression from the saved GCC tree for the
1057 object if it has a Freeze node, or elaborate the address expression
1058 here since the front-end has guaranteed that the elaboration has no
1059 effects in this case. */
1060 if (definition && Present (Address_Clause (gnat_entity)))
1063 = present_gnu_tree (gnat_entity)
1064 ? get_gnu_tree (gnat_entity)
1065 : gnat_to_gnu (Expression (Address_Clause (gnat_entity)));
1067 save_gnu_tree (gnat_entity, NULL_TREE, false);
1069 /* Ignore the size. It's either meaningless or was handled
1071 gnu_size = NULL_TREE;
1072 /* Convert the type of the object to a reference type that can
1073 alias everything as per 13.3(19). */
1075 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1076 gnu_address = convert (gnu_type, gnu_address);
1078 const_flag = !Is_Public (gnat_entity)
1079 || compile_time_known_address_p (Expression (Address_Clause
1082 /* If this is a deferred constant, the initializer is attached to
1084 if (kind == E_Constant && Present (Full_View (gnat_entity)))
1087 (Expression (Declaration_Node (Full_View (gnat_entity))));
1089 /* If we don't have an initializing expression for the underlying
1090 variable, the initializing expression for the pointer is the
1091 specified address. Otherwise, we have to make a COMPOUND_EXPR
1092 to assign both the address and the initial value. */
1094 gnu_expr = gnu_address;
1097 = build2 (COMPOUND_EXPR, gnu_type,
1099 (MODIFY_EXPR, NULL_TREE,
1100 build_unary_op (INDIRECT_REF, NULL_TREE,
1106 /* If it has an address clause and we are not defining it, mark it
1107 as an indirect object. Likewise for Stdcall objects that are
1109 if ((!definition && Present (Address_Clause (gnat_entity)))
1110 || (Is_Imported (gnat_entity)
1111 && Has_Stdcall_Convention (gnat_entity)))
1113 /* Convert the type of the object to a reference type that can
1114 alias everything as per 13.3(19). */
1116 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
1117 gnu_size = NULL_TREE;
1119 /* No point in taking the address of an initializing expression
1120 that isn't going to be used. */
1121 gnu_expr = NULL_TREE;
1123 /* If it has an address clause whose value is known at compile
1124 time, make the object a CONST_DECL. This will avoid a
1125 useless dereference. */
1126 if (Present (Address_Clause (gnat_entity)))
1128 Node_Id gnat_address
1129 = Expression (Address_Clause (gnat_entity));
1131 if (compile_time_known_address_p (gnat_address))
1133 gnu_expr = gnat_to_gnu (gnat_address);
1141 /* If we are at top level and this object is of variable size,
1142 make the actual type a hidden pointer to the real type and
1143 make the initializer be a memory allocation and initialization.
1144 Likewise for objects we aren't defining (presumed to be
1145 external references from other packages), but there we do
1146 not set up an initialization.
1148 If the object's size overflows, make an allocator too, so that
1149 Storage_Error gets raised. Note that we will never free
1150 such memory, so we presume it never will get allocated. */
1152 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
1153 global_bindings_p () || !definition
1156 && ! allocatable_size_p (gnu_size,
1157 global_bindings_p () || !definition
1160 gnu_type = build_reference_type (gnu_type);
1161 gnu_size = NULL_TREE;
1165 /* In case this was a aliased object whose nominal subtype is
1166 unconstrained, the pointer above will be a thin pointer and
1167 build_allocator will automatically make the template.
1169 If we have a template initializer only (that we made above),
1170 pretend there is none and rely on what build_allocator creates
1171 again anyway. Otherwise (if we have a full initializer), get
1172 the data part and feed that to build_allocator.
1174 If we are elaborating a mutable object, tell build_allocator to
1175 ignore a possibly simpler size from the initializer, if any, as
1176 we must allocate the maximum possible size in this case. */
1180 tree gnu_alloc_type = TREE_TYPE (gnu_type);
1182 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
1183 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
1186 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
1188 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
1189 && 1 == VEC_length (constructor_elt,
1190 CONSTRUCTOR_ELTS (gnu_expr)))
1194 = build_component_ref
1195 (gnu_expr, NULL_TREE,
1196 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
1200 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
1201 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
1202 && !Is_Imported (gnat_entity))
1203 post_error ("?Storage_Error will be raised at run-time!",
1207 = build_allocator (gnu_alloc_type, gnu_expr, gnu_type,
1208 Empty, Empty, gnat_entity, mutable_p);
1212 gnu_expr = NULL_TREE;
1217 /* If this object would go into the stack and has an alignment larger
1218 than the largest stack alignment the back-end can honor, resort to
1219 a variable of "aligning type". */
1220 if (!global_bindings_p () && !static_p && definition
1221 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
1223 /* Create the new variable. No need for extra room before the
1224 aligned field as this is in automatic storage. */
1226 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
1227 TYPE_SIZE_UNIT (gnu_type),
1228 BIGGEST_ALIGNMENT, 0);
1230 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
1231 NULL_TREE, gnu_new_type, NULL_TREE, false,
1232 false, false, false, NULL, gnat_entity);
1234 /* Initialize the aligned field if we have an initializer. */
1237 (build_binary_op (MODIFY_EXPR, NULL_TREE,
1239 (gnu_new_var, NULL_TREE,
1240 TYPE_FIELDS (gnu_new_type), false),
1244 /* And setup this entity as a reference to the aligned field. */
1245 gnu_type = build_reference_type (gnu_type);
1248 (ADDR_EXPR, gnu_type,
1249 build_component_ref (gnu_new_var, NULL_TREE,
1250 TYPE_FIELDS (gnu_new_type), false));
1252 gnu_size = NULL_TREE;
1258 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1259 | TYPE_QUAL_CONST));
1261 /* Convert the expression to the type of the object except in the
1262 case where the object's type is unconstrained or the object's type
1263 is a padded record whose field is of self-referential size. In
1264 the former case, converting will generate unnecessary evaluations
1265 of the CONSTRUCTOR to compute the size and in the latter case, we
1266 want to only copy the actual data. */
1268 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1269 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1270 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1271 && TYPE_IS_PADDING_P (gnu_type)
1272 && (CONTAINS_PLACEHOLDER_P
1273 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1274 gnu_expr = convert (gnu_type, gnu_expr);
1276 /* If this name is external or there was a name specified, use it,
1277 unless this is a VMS exception object since this would conflict
1278 with the symbol we need to export in addition. Don't use the
1279 Interface_Name if there is an address clause (see CD30005). */
1280 if (!Is_VMS_Exception (gnat_entity)
1281 && ((Present (Interface_Name (gnat_entity))
1282 && No (Address_Clause (gnat_entity)))
1283 || (Is_Public (gnat_entity)
1284 && (!Is_Imported (gnat_entity)
1285 || Is_Exported (gnat_entity)))))
1286 gnu_ext_name = create_concat_name (gnat_entity, NULL);
1288 /* If this is constant initialized to a static constant and the
1289 object has an aggregate type, force it to be statically
1290 allocated. This will avoid an initialization copy. */
1291 if (!static_p && const_flag
1292 && gnu_expr && TREE_CONSTANT (gnu_expr)
1293 && AGGREGATE_TYPE_P (gnu_type)
1294 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1295 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1296 && TYPE_IS_PADDING_P (gnu_type)
1297 && !host_integerp (TYPE_SIZE_UNIT
1298 (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1)))
1301 gnu_decl = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1302 gnu_expr, const_flag,
1303 Is_Public (gnat_entity),
1304 imported_p || !definition,
1305 static_p, attr_list, gnat_entity);
1306 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1307 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1308 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1310 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1311 if (global_bindings_p ())
1313 DECL_RENAMING_GLOBAL_P (gnu_decl) = 1;
1314 record_global_renaming_pointer (gnu_decl);
1318 if (definition && DECL_SIZE_UNIT (gnu_decl)
1319 && get_block_jmpbuf_decl ()
1320 && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST
1321 || (flag_stack_check == GENERIC_STACK_CHECK
1322 && compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1323 STACK_CHECK_MAX_VAR_SIZE) > 0)))
1324 add_stmt_with_node (build_call_1_expr
1325 (update_setjmp_buf_decl,
1326 build_unary_op (ADDR_EXPR, NULL_TREE,
1327 get_block_jmpbuf_decl ())),
1330 /* If we are defining an Out parameter and we're not optimizing,
1331 create a fake PARM_DECL for debugging purposes and make it
1332 point to the VAR_DECL. Suppress debug info for the latter
1333 but make sure it will still live on the stack so it can be
1334 accessed from within the debugger through the PARM_DECL. */
1335 if (kind == E_Out_Parameter && definition && !optimize)
1337 tree param = create_param_decl (gnu_entity_name, gnu_type, false);
1338 gnat_pushdecl (param, gnat_entity);
1339 SET_DECL_VALUE_EXPR (param, gnu_decl);
1340 DECL_HAS_VALUE_EXPR_P (param) = 1;
1342 debug_info_p = false;
1344 DECL_IGNORED_P (param) = 1;
1345 TREE_ADDRESSABLE (gnu_decl) = 1;
1348 /* If this is a public constant or we're not optimizing and we're not
1349 making a VAR_DECL for it, make one just for export or debugger use.
1350 Likewise if the address is taken or if either the object or type is
1351 aliased. Make an external declaration for a reference, unless this
1352 is a Standard entity since there no real symbol at the object level
1354 if (TREE_CODE (gnu_decl) == CONST_DECL
1355 && (definition || Sloc (gnat_entity) > Standard_Location)
1356 && ((Is_Public (gnat_entity) && No (Address_Clause (gnat_entity)))
1358 || Address_Taken (gnat_entity)
1359 || Is_Aliased (gnat_entity)
1360 || Is_Aliased (Etype (gnat_entity))))
1363 = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
1364 gnu_expr, true, Is_Public (gnat_entity),
1365 !definition, static_p, NULL,
1368 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1370 /* As debugging information will be generated for the variable,
1371 do not generate information for the constant. */
1372 DECL_IGNORED_P (gnu_decl) = 1;
1375 /* If this is declared in a block that contains a block with an
1376 exception handler, we must force this variable in memory to
1377 suppress an invalid optimization. */
1378 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1379 && Exception_Mechanism != Back_End_Exceptions)
1380 TREE_ADDRESSABLE (gnu_decl) = 1;
1382 gnu_type = TREE_TYPE (gnu_decl);
1384 /* Back-annotate Alignment and Esize of the object if not already
1385 known, except for when the object is actually a pointer to the
1386 real object, since alignment and size of a pointer don't have
1387 anything to do with those of the designated object. Note that
1388 we pick the values of the type, not those of the object, to
1389 shield ourselves from low-level platform-dependent adjustments
1390 like alignment promotion. This is both consistent with all the
1391 treatment above, where alignment and size are set on the type of
1392 the object and not on the object directly, and makes it possible
1393 to support confirming representation clauses in all cases. */
1395 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1396 Set_Alignment (gnat_entity,
1397 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
1399 if (!used_by_ref && Unknown_Esize (gnat_entity))
1401 if (TREE_CODE (gnu_type) == RECORD_TYPE
1402 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
1404 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))));
1406 Set_Esize (gnat_entity, annotate_value (gnu_object_size));
1412 /* Return a TYPE_DECL for "void" that we previously made. */
1413 gnu_decl = TYPE_NAME (void_type_node);
1416 case E_Enumeration_Type:
1417 /* A special case: for the types Character and Wide_Character in
1418 Standard, we do not list all the literals. So if the literals
1419 are not specified, make this an unsigned type. */
1420 if (No (First_Literal (gnat_entity)))
1422 gnu_type = make_unsigned_type (esize);
1423 TYPE_NAME (gnu_type) = gnu_entity_name;
1425 /* Set TYPE_STRING_FLAG for Character and Wide_Character types.
1426 This is needed by the DWARF-2 back-end to distinguish between
1427 unsigned integer types and character types. */
1428 TYPE_STRING_FLAG (gnu_type) = 1;
1432 /* Normal case of non-character type or non-Standard character type. */
1434 /* Here we have a list of enumeral constants in First_Literal.
1435 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1436 the list to be placed into TYPE_FIELDS. Each node in the list
1437 is a TREE_LIST whose TREE_VALUE is the literal name and whose
1438 TREE_PURPOSE is the value of the literal. */
1440 Entity_Id gnat_literal;
1441 tree gnu_literal_list = NULL_TREE;
1443 if (Is_Unsigned_Type (gnat_entity))
1444 gnu_type = make_unsigned_type (esize);
1446 gnu_type = make_signed_type (esize);
1448 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1450 for (gnat_literal = First_Literal (gnat_entity);
1451 Present (gnat_literal);
1452 gnat_literal = Next_Literal (gnat_literal))
1454 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1457 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1458 gnu_type, gnu_value, true, false, false,
1459 false, NULL, gnat_literal);
1461 save_gnu_tree (gnat_literal, gnu_literal, false);
1462 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1463 gnu_value, gnu_literal_list);
1466 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1468 /* Note that the bounds are updated at the end of this function
1469 to avoid an infinite recursion since they refer to the type. */
1473 case E_Signed_Integer_Type:
1474 case E_Ordinary_Fixed_Point_Type:
1475 case E_Decimal_Fixed_Point_Type:
1476 /* For integer types, just make a signed type the appropriate number
1478 gnu_type = make_signed_type (esize);
1481 case E_Modular_Integer_Type:
1483 /* For modular types, make the unsigned type of the proper number
1484 of bits and then set up the modulus, if required. */
1485 tree gnu_modulus, gnu_high = NULL_TREE;
1487 /* Packed array types are supposed to be subtypes only. */
1488 gcc_assert (!Is_Packed_Array_Type (gnat_entity));
1490 gnu_type = make_unsigned_type (esize);
1492 /* Get the modulus in this type. If it overflows, assume it is because
1493 it is equal to 2**Esize. Note that there is no overflow checking
1494 done on unsigned type, so we detect the overflow by looking for
1495 a modulus of zero, which is otherwise invalid. */
1496 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1498 if (!integer_zerop (gnu_modulus))
1500 TYPE_MODULAR_P (gnu_type) = 1;
1501 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1502 gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1503 convert (gnu_type, integer_one_node));
1506 /* If the upper bound is not maximal, make an extra subtype. */
1508 && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type)))
1510 tree gnu_subtype = make_unsigned_type (esize);
1511 SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high);
1512 TREE_TYPE (gnu_subtype) = gnu_type;
1513 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1514 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1515 gnu_type = gnu_subtype;
1520 case E_Signed_Integer_Subtype:
1521 case E_Enumeration_Subtype:
1522 case E_Modular_Integer_Subtype:
1523 case E_Ordinary_Fixed_Point_Subtype:
1524 case E_Decimal_Fixed_Point_Subtype:
1526 /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do
1527 not want to call create_range_type since we would like each subtype
1528 node to be distinct. ??? Historically this was in preparation for
1529 when memory aliasing is implemented, but that's obsolete now given
1530 the call to relate_alias_sets below.
1532 The TREE_TYPE field of the INTEGER_TYPE points to the base type;
1533 this fact is used by the arithmetic conversion functions.
1535 We elaborate the Ancestor_Subtype if it is not in the current unit
1536 and one of our bounds is non-static. We do this to ensure consistent
1537 naming in the case where several subtypes share the same bounds, by
1538 elaborating the first such subtype first, thus using its name. */
1541 && Present (Ancestor_Subtype (gnat_entity))
1542 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1543 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1544 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1545 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0);
1547 /* Set the precision to the Esize except for bit-packed arrays. */
1548 if (Is_Packed_Array_Type (gnat_entity)
1549 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1550 esize = UI_To_Int (RM_Size (gnat_entity));
1552 /* This should be an unsigned type if the base type is unsigned or
1553 if the lower bound is constant and non-negative or if the type
1555 if (Is_Unsigned_Type (Etype (gnat_entity))
1556 || Is_Unsigned_Type (gnat_entity)
1557 || Has_Biased_Representation (gnat_entity))
1558 gnu_type = make_unsigned_type (esize);
1560 gnu_type = make_signed_type (esize);
1561 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1563 SET_TYPE_RM_MIN_VALUE
1565 convert (TREE_TYPE (gnu_type),
1566 elaborate_expression (Type_Low_Bound (gnat_entity),
1567 gnat_entity, get_identifier ("L"),
1569 Needs_Debug_Info (gnat_entity))));
1571 SET_TYPE_RM_MAX_VALUE
1573 convert (TREE_TYPE (gnu_type),
1574 elaborate_expression (Type_High_Bound (gnat_entity),
1575 gnat_entity, get_identifier ("U"),
1577 Needs_Debug_Info (gnat_entity))));
1579 /* One of the above calls might have caused us to be elaborated,
1580 so don't blow up if so. */
1581 if (present_gnu_tree (gnat_entity))
1583 maybe_present = true;
1587 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1588 = Has_Biased_Representation (gnat_entity);
1590 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
1591 TYPE_STUB_DECL (gnu_type)
1592 = create_type_stub_decl (gnu_entity_name, gnu_type);
1594 /* Inherit our alias set from what we're a subtype of. Subtypes
1595 are not different types and a pointer can designate any instance
1596 within a subtype hierarchy. */
1597 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1599 /* For a packed array, make the original array type a parallel type. */
1601 && Is_Packed_Array_Type (gnat_entity)
1602 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1603 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1605 (Original_Array_Type (gnat_entity)));
1607 /* If the type we are dealing with represents a bit-packed array,
1608 we need to have the bits left justified on big-endian targets
1609 and right justified on little-endian targets. We also need to
1610 ensure that when the value is read (e.g. for comparison of two
1611 such values), we only get the good bits, since the unused bits
1612 are uninitialized. Both goals are accomplished by wrapping up
1613 the modular type in an enclosing record type. */
1614 if (Is_Packed_Array_Type (gnat_entity)
1615 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
1617 tree gnu_field_type, gnu_field;
1619 /* Set the RM size before wrapping up the type. */
1620 SET_TYPE_RM_SIZE (gnu_type,
1621 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1622 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1623 gnu_field_type = gnu_type;
1625 gnu_type = make_node (RECORD_TYPE);
1626 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1628 /* Propagate the alignment of the modular type to the record.
1629 This means that bit-packed arrays have "ceil" alignment for
1630 their size, which may seem counter-intuitive but makes it
1631 possible to easily overlay them on modular types. */
1632 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1633 TYPE_PACKED (gnu_type) = 1;
1635 /* Create a stripped-down declaration of the original type, mainly
1637 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1638 debug_info_p, gnat_entity);
1640 /* Don't notify the field as "addressable", since we won't be taking
1641 it's address and it would prevent create_field_decl from making a
1643 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1644 gnu_field_type, gnu_type, 1, 0, 0, 0);
1646 /* Do not finalize it until after the parallel type is added. */
1647 finish_record_type (gnu_type, gnu_field, 0, true);
1648 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1650 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1652 /* Make the original array type a parallel type. */
1654 && present_gnu_tree (Original_Array_Type (gnat_entity)))
1655 add_parallel_type (TYPE_STUB_DECL (gnu_type),
1657 (Original_Array_Type (gnat_entity)));
1659 rest_of_record_type_compilation (gnu_type);
1662 /* If the type we are dealing with has got a smaller alignment than the
1663 natural one, we need to wrap it up in a record type and under-align
1664 the latter. We reuse the padding machinery for this purpose. */
1665 else if (Present (Alignment_Clause (gnat_entity))
1666 && UI_Is_In_Int_Range (Alignment (gnat_entity))
1667 && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
1668 && align < TYPE_ALIGN (gnu_type))
1670 tree gnu_field_type, gnu_field;
1672 /* Set the RM size before wrapping up the type. */
1673 SET_TYPE_RM_SIZE (gnu_type,
1674 UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
1675 gnu_field_type = gnu_type;
1677 gnu_type = make_node (RECORD_TYPE);
1678 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
1680 TYPE_ALIGN (gnu_type) = align;
1681 TYPE_PACKED (gnu_type) = 1;
1683 /* Create a stripped-down declaration of the original type, mainly
1685 create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
1686 debug_info_p, gnat_entity);
1688 /* Don't notify the field as "addressable", since we won't be taking
1689 it's address and it would prevent create_field_decl from making a
1691 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1692 gnu_field_type, gnu_type, 1, 0, 0, 0);
1694 finish_record_type (gnu_type, gnu_field, 0, false);
1695 TYPE_IS_PADDING_P (gnu_type) = 1;
1697 relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
1700 /* Otherwise reset the alignment lest we computed it above. */
1706 case E_Floating_Point_Type:
1707 /* If this is a VAX floating-point type, use an integer of the proper
1708 size. All the operations will be handled with ASM statements. */
1709 if (Vax_Float (gnat_entity))
1711 gnu_type = make_signed_type (esize);
1712 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1713 SET_TYPE_DIGITS_VALUE (gnu_type,
1714 UI_To_gnu (Digits_Value (gnat_entity),
1719 /* The type of the Low and High bounds can be our type if this is
1720 a type from Standard, so set them at the end of the function. */
1721 gnu_type = make_node (REAL_TYPE);
1722 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1723 layout_type (gnu_type);
1726 case E_Floating_Point_Subtype:
1727 if (Vax_Float (gnat_entity))
1729 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1735 && Present (Ancestor_Subtype (gnat_entity))
1736 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1737 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1738 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1739 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1742 gnu_type = make_node (REAL_TYPE);
1743 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1744 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1745 TYPE_GCC_MIN_VALUE (gnu_type)
1746 = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type));
1747 TYPE_GCC_MAX_VALUE (gnu_type)
1748 = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type));
1749 layout_type (gnu_type);
1751 SET_TYPE_RM_MIN_VALUE
1753 convert (TREE_TYPE (gnu_type),
1754 elaborate_expression (Type_Low_Bound (gnat_entity),
1755 gnat_entity, get_identifier ("L"),
1757 Needs_Debug_Info (gnat_entity))));
1759 SET_TYPE_RM_MAX_VALUE
1761 convert (TREE_TYPE (gnu_type),
1762 elaborate_expression (Type_High_Bound (gnat_entity),
1763 gnat_entity, get_identifier ("U"),
1765 Needs_Debug_Info (gnat_entity))));
1767 /* One of the above calls might have caused us to be elaborated,
1768 so don't blow up if so. */
1769 if (present_gnu_tree (gnat_entity))
1771 maybe_present = true;
1775 /* Inherit our alias set from what we're a subtype of, as for
1776 integer subtypes. */
1777 relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY);
1781 /* Array and String Types and Subtypes
1783 Unconstrained array types are represented by E_Array_Type and
1784 constrained array types are represented by E_Array_Subtype. There
1785 are no actual objects of an unconstrained array type; all we have
1786 are pointers to that type.
1788 The following fields are defined on array types and subtypes:
1790 Component_Type Component type of the array.
1791 Number_Dimensions Number of dimensions (an int).
1792 First_Index Type of first index. */
1797 Entity_Id gnat_ind_subtype;
1798 Entity_Id gnat_ind_base_subtype;
1799 int ndim = Number_Dimensions (gnat_entity);
1801 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1803 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1805 tree gnu_template_fields = NULL_TREE;
1806 tree gnu_template_type = make_node (RECORD_TYPE);
1807 tree gnu_template_reference;
1808 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1809 tree gnu_fat_type = make_node (RECORD_TYPE);
1810 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree));
1811 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree));
1812 tree gnu_max_size = size_one_node, gnu_max_size_unit;
1813 tree gnu_comp_size, tem;
1815 TYPE_NAME (gnu_template_type)
1816 = create_concat_name (gnat_entity, "XUB");
1818 /* Make a node for the array. If we are not defining the array
1819 suppress expanding incomplete types. */
1820 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1824 defer_incomplete_level++;
1825 this_deferred = true;
1828 /* Build the fat pointer type. Use a "void *" object instead of
1829 a pointer to the array type since we don't have the array type
1830 yet (it will reference the fat pointer via the bounds). */
1831 tem = chainon (chainon (NULL_TREE,
1832 create_field_decl (get_identifier ("P_ARRAY"),
1834 gnu_fat_type, 0, 0, 0, 0)),
1835 create_field_decl (get_identifier ("P_BOUNDS"),
1837 gnu_fat_type, 0, 0, 0, 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
1858 that index to the template. */
1859 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
1860 gnat_ind_base_subtype
1861 = First_Index (Implementation_Base_Type (gnat_entity));
1862 index < ndim && index >= 0;
1864 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1865 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1867 char field_name[10];
1868 tree gnu_ind_subtype
1869 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1870 tree gnu_base_subtype
1871 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1873 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1875 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1876 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1878 /* Make the FIELD_DECLs for the minimum and maximum of this
1879 type and then make extractions of that field from the
1881 sprintf (field_name, "LB%d", index);
1882 gnu_min_field = create_field_decl (get_identifier (field_name),
1884 gnu_template_type, 0, 0, 0, 0);
1885 field_name[0] = 'U';
1886 gnu_max_field = create_field_decl (get_identifier (field_name),
1888 gnu_template_type, 0, 0, 0, 0);
1890 Sloc_to_locus (Sloc (gnat_entity),
1891 &DECL_SOURCE_LOCATION (gnu_min_field));
1892 Sloc_to_locus (Sloc (gnat_entity),
1893 &DECL_SOURCE_LOCATION (gnu_max_field));
1894 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1896 /* We can't use build_component_ref here since the template
1897 type isn't complete yet. */
1898 gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype,
1899 gnu_template_reference, gnu_min_field,
1901 gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype,
1902 gnu_template_reference, gnu_max_field,
1904 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1906 /* Make a range type with the new ranges, but using
1907 the Ada subtype. Then we convert to sizetype. */
1908 gnu_index_types[index]
1909 = create_index_type (convert (sizetype, gnu_min),
1910 convert (sizetype, gnu_max),
1911 create_range_type (gnu_ind_subtype,
1914 /* Update the maximum size of the array, in elements. */
1916 = size_binop (MULT_EXPR, gnu_max_size,
1917 size_binop (PLUS_EXPR, size_one_node,
1918 size_binop (MINUS_EXPR, gnu_base_max,
1921 TYPE_NAME (gnu_index_types[index])
1922 = create_concat_name (gnat_entity, field_name);
1925 for (index = 0; index < ndim; index++)
1927 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1929 /* Install all the fields into the template. */
1930 finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
1931 TYPE_READONLY (gnu_template_type) = 1;
1933 /* Now make the array of arrays and update the pointer to the array
1934 in the fat pointer. Note that it is the first field. */
1935 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1937 /* Try to get a smaller form of the component if needed. */
1938 if ((Is_Packed (gnat_entity)
1939 || Has_Component_Size_Clause (gnat_entity))
1940 && !Is_Bit_Packed_Array (gnat_entity)
1941 && !Has_Aliased_Components (gnat_entity)
1942 && !Strict_Alignment (Component_Type (gnat_entity))
1943 && TREE_CODE (tem) == RECORD_TYPE
1944 && !TYPE_IS_FAT_POINTER_P (tem)
1945 && host_integerp (TYPE_SIZE (tem), 1))
1946 tem = make_packable_type (tem, false);
1948 if (Has_Atomic_Components (gnat_entity))
1949 check_ok_for_atomic (tem, gnat_entity, true);
1951 /* Get and validate any specified Component_Size, but if Packed,
1952 ignore it since the front end will have taken care of it. */
1954 = validate_size (Component_Size (gnat_entity), tem,
1956 (Is_Bit_Packed_Array (gnat_entity)
1957 ? TYPE_DECL : VAR_DECL),
1958 true, Has_Component_Size_Clause (gnat_entity));
1960 /* If the component type is a RECORD_TYPE that has a self-referential
1961 size, use the maximum size. */
1963 && TREE_CODE (tem) == RECORD_TYPE
1964 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1965 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1967 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
1969 tree orig_tem = tem;
1970 unsigned int max_align;
1972 /* If an alignment is specified, use it as a cap on the component
1973 type so that it can be honored for the whole type. But ignore
1974 it for the original type of packed array types. */
1975 if (No (Packed_Array_Type (gnat_entity))
1976 && Known_Alignment (gnat_entity))
1977 max_align = validate_alignment (Alignment (gnat_entity),
1982 tem = make_type_from_size (tem, gnu_comp_size, false);
1983 if (max_align > 0 && TYPE_ALIGN (tem) > max_align)
1988 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1989 "C_PAD", false, definition, true);
1991 /* If a padding record was made, declare it now since it will
1992 never be declared otherwise. This is necessary to ensure
1993 that its subtrees are properly marked. */
1994 if (tem != orig_tem)
1995 create_type_decl (TYPE_NAME (tem), tem, NULL, true,
1996 debug_info_p, gnat_entity);
1999 if (Has_Volatile_Components (gnat_entity))
2000 tem = build_qualified_type (tem,
2001 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
2003 /* If Component_Size is not already specified, annotate it with the
2004 size of the component. */
2005 if (Unknown_Component_Size (gnat_entity))
2006 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
2008 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
2009 size_binop (MULT_EXPR, gnu_max_size,
2010 TYPE_SIZE_UNIT (tem)));
2011 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
2012 size_binop (MULT_EXPR,
2013 convert (bitsizetype,
2017 for (index = ndim - 1; index >= 0; index--)
2019 tem = build_array_type (tem, gnu_index_types[index]);
2020 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
2021 if (array_type_has_nonaliased_component (gnat_entity, tem))
2022 TYPE_NONALIASED_COMPONENT (tem) = 1;
2025 /* If an alignment is specified, use it if valid. But ignore it
2026 for the original type of packed array types. If the alignment
2027 was requested with an explicit alignment clause, state so. */
2028 if (No (Packed_Array_Type (gnat_entity))
2029 && Known_Alignment (gnat_entity))
2032 = validate_alignment (Alignment (gnat_entity), gnat_entity,
2034 if (Present (Alignment_Clause (gnat_entity)))
2035 TYPE_USER_ALIGN (tem) = 1;
2038 TYPE_CONVENTION_FORTRAN_P (tem)
2039 = (Convention (gnat_entity) == Convention_Fortran);
2040 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
2042 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
2043 corresponding fat pointer. */
2044 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
2045 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
2046 SET_TYPE_MODE (gnu_type, BLKmode);
2047 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
2048 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
2050 /* If the maximum size doesn't overflow, use it. */
2051 if (TREE_CODE (gnu_max_size) == INTEGER_CST
2052 && !TREE_OVERFLOW (gnu_max_size))
2054 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
2055 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2056 && !TREE_OVERFLOW (gnu_max_size_unit))
2057 TYPE_SIZE_UNIT (tem)
2058 = size_binop (MIN_EXPR, gnu_max_size_unit,
2059 TYPE_SIZE_UNIT (tem));
2061 create_type_decl (create_concat_name (gnat_entity, "XUA"),
2062 tem, NULL, !Comes_From_Source (gnat_entity),
2063 debug_info_p, gnat_entity);
2065 /* Give the fat pointer type a name. */
2066 create_type_decl (create_concat_name (gnat_entity, "XUP"),
2067 gnu_fat_type, NULL, true,
2068 debug_info_p, gnat_entity);
2070 /* Create the type to be used as what a thin pointer designates: an
2071 record type for the object and its template with the field offsets
2072 shifted to have the template at a negative offset. */
2073 tem = build_unc_object_type (gnu_template_type, tem,
2074 create_concat_name (gnat_entity, "XUT"));
2075 shift_unc_components_for_thin_pointers (tem);
2077 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
2078 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
2080 /* Give the thin pointer type a name. */
2081 create_type_decl (create_concat_name (gnat_entity, "XUX"),
2082 build_pointer_type (tem), NULL, true,
2083 debug_info_p, gnat_entity);
2087 case E_String_Subtype:
2088 case E_Array_Subtype:
2090 /* This is the actual data type for array variables. Multidimensional
2091 arrays are implemented in the gnu tree as arrays of arrays. Note
2092 that for the moment arrays which have sparse enumeration subtypes as
2093 index components create sparse arrays, which is obviously space
2094 inefficient but so much easier to code for now.
2096 Also note that the subtype never refers to the unconstrained
2097 array type, which is somewhat at variance with Ada semantics.
2099 First check to see if this is simply a renaming of the array
2100 type. If so, the result is the array type. */
2102 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
2103 if (!Is_Constrained (gnat_entity))
2107 Entity_Id gnat_ind_subtype;
2108 Entity_Id gnat_ind_base_subtype;
2109 int dim = Number_Dimensions (gnat_entity);
2111 = (Convention (gnat_entity) == Convention_Fortran) ? dim - 1 : 0;
2113 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
2115 tree gnu_base_type = gnu_type;
2116 tree *gnu_index_type = (tree *) alloca (dim * sizeof (tree));
2117 tree gnu_max_size = size_one_node, gnu_max_size_unit;
2118 bool need_index_type_struct = false;
2119 bool max_overflow = false;
2121 /* First create the gnu types for each index. Create types for
2122 debugging information to point to the index types if the
2123 are not integer types, have variable bounds, or are
2124 wider than sizetype. */
2126 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
2127 gnat_ind_base_subtype
2128 = First_Index (Implementation_Base_Type (gnat_entity));
2129 index < dim && index >= 0;
2131 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
2132 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
2134 tree gnu_index_subtype
2135 = get_unpadded_type (Etype (gnat_ind_subtype));
2137 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
2139 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
2140 tree gnu_base_subtype
2141 = get_unpadded_type (Etype (gnat_ind_base_subtype));
2143 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
2145 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
2146 tree gnu_base_type = get_base_type (gnu_base_subtype);
2147 tree gnu_base_base_min
2148 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
2149 tree gnu_base_base_max
2150 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
2154 /* If the minimum and maximum values both overflow in
2155 SIZETYPE, but the difference in the original type
2156 does not overflow in SIZETYPE, ignore the overflow
2158 if ((TYPE_PRECISION (gnu_index_subtype)
2159 > TYPE_PRECISION (sizetype)
2160 || TYPE_UNSIGNED (gnu_index_subtype)
2161 != TYPE_UNSIGNED (sizetype))
2162 && TREE_CODE (gnu_min) == INTEGER_CST
2163 && TREE_CODE (gnu_max) == INTEGER_CST
2164 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
2166 (fold_build2 (MINUS_EXPR, gnu_index_subtype,
2167 TYPE_MAX_VALUE (gnu_index_subtype),
2168 TYPE_MIN_VALUE (gnu_index_subtype))))
2170 TREE_OVERFLOW (gnu_min) = 0;
2171 TREE_OVERFLOW (gnu_max) = 0;
2172 if (tree_int_cst_lt (gnu_max, gnu_min))
2174 gnu_min = size_one_node;
2175 gnu_max = size_zero_node;
2180 /* Similarly, if the range is null, use bounds of 1..0 for
2181 the sizetype bounds. */
2182 else if ((TYPE_PRECISION (gnu_index_subtype)
2183 > TYPE_PRECISION (sizetype)
2184 || TYPE_UNSIGNED (gnu_index_subtype)
2185 != TYPE_UNSIGNED (sizetype))
2186 && TREE_CODE (gnu_min) == INTEGER_CST
2187 && TREE_CODE (gnu_max) == INTEGER_CST
2188 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
2189 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
2190 TYPE_MIN_VALUE (gnu_index_subtype)))
2192 gnu_min = size_one_node;
2193 gnu_max = size_zero_node;
2197 /* See if the base array type is already flat. If it is, we
2198 are probably compiling an ACATS test, but it will cause the
2199 code below to malfunction if we don't handle it specially. */
2200 else if (TREE_CODE (gnu_base_min) == INTEGER_CST
2201 && TREE_CODE (gnu_base_max) == INTEGER_CST
2202 && !TREE_OVERFLOW (gnu_base_min)
2203 && !TREE_OVERFLOW (gnu_base_max)
2204 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
2206 gnu_min = size_one_node;
2207 gnu_max = size_zero_node;
2213 /* Now compute the size of this bound. We need to provide
2214 GCC with an upper bound to use but have to deal with the
2215 "superflat" case. There are three ways to do this. If
2216 we can prove that the array can never be superflat, we
2217 can just use the high bound of the index subtype. If we
2218 can prove that the low bound minus one can't overflow,
2219 we can do this as MAX (hb, lb - 1). Otherwise, we have
2220 to use the expression hb >= lb ? hb : lb - 1. */
2221 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
2223 /* If gnu_high is now an integer which overflowed, the array
2224 cannot be superflat. */
2225 if (TREE_CODE (gnu_high) == INTEGER_CST
2226 && TREE_OVERFLOW (gnu_high))
2229 /* gnu_high cannot overflow if the subtype is unsigned since
2230 sizetype is signed, or if it is now a constant that hasn't
2232 else if (TYPE_UNSIGNED (gnu_base_subtype)
2233 || TREE_CODE (gnu_high) == INTEGER_CST)
2234 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
2238 = build_cond_expr (sizetype,
2239 build_binary_op (GE_EXPR,
2245 gnu_index_type[index]
2246 = create_index_type (gnu_min, gnu_high, gnu_index_subtype,
2249 /* Also compute the maximum size of the array. Here we
2250 see if any constraint on the index type of the base type
2251 can be used in the case of self-referential bound on
2252 the index type of the subtype. We look for a non-"infinite"
2253 and non-self-referential bound from any type involved and
2254 handle each bound separately. */
2256 if ((TREE_CODE (gnu_min) == INTEGER_CST
2257 && !TREE_OVERFLOW (gnu_min)
2258 && !operand_equal_p (gnu_min, gnu_base_base_min, 0))
2259 || !CONTAINS_PLACEHOLDER_P (gnu_min)
2260 || !(TREE_CODE (gnu_base_min) == INTEGER_CST
2261 && !TREE_OVERFLOW (gnu_base_min)))
2262 gnu_base_min = gnu_min;
2264 if ((TREE_CODE (gnu_max) == INTEGER_CST
2265 && !TREE_OVERFLOW (gnu_max)
2266 && !operand_equal_p (gnu_max, gnu_base_base_max, 0))
2267 || !CONTAINS_PLACEHOLDER_P (gnu_max)
2268 || !(TREE_CODE (gnu_base_max) == INTEGER_CST
2269 && !TREE_OVERFLOW (gnu_base_max)))
2270 gnu_base_max = gnu_max;
2272 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
2273 && TREE_OVERFLOW (gnu_base_min))
2274 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
2275 || (TREE_CODE (gnu_base_max) == INTEGER_CST
2276 && TREE_OVERFLOW (gnu_base_max))
2277 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
2278 max_overflow = true;
2280 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
2281 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
2284 = size_binop (MAX_EXPR,
2285 size_binop (PLUS_EXPR, size_one_node,
2286 size_binop (MINUS_EXPR, gnu_base_max,
2290 if (TREE_CODE (gnu_this_max) == INTEGER_CST
2291 && TREE_OVERFLOW (gnu_this_max))
2292 max_overflow = true;
2295 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
2297 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
2298 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
2300 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
2301 || (TREE_TYPE (gnu_index_subtype)
2302 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
2304 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
2305 || (TYPE_PRECISION (gnu_index_subtype)
2306 > TYPE_PRECISION (sizetype)))
2307 need_index_type_struct = true;
2310 /* Then flatten: create the array of arrays. For an array type
2311 used to implement a packed array, get the component type from
2312 the original array type since the representation clauses that
2313 can affect it are on the latter. */
2314 if (Is_Packed_Array_Type (gnat_entity)
2315 && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)))
2317 gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity));
2318 for (index = dim - 1; index >= 0; index--)
2319 gnu_type = TREE_TYPE (gnu_type);
2321 /* One of the above calls might have caused us to be elaborated,
2322 so don't blow up if so. */
2323 if (present_gnu_tree (gnat_entity))
2325 maybe_present = true;
2333 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
2335 /* One of the above calls might have caused us to be elaborated,
2336 so don't blow up if so. */
2337 if (present_gnu_tree (gnat_entity))
2339 maybe_present = true;
2343 /* Try to get a smaller form of the component if needed. */
2344 if ((Is_Packed (gnat_entity)
2345 || Has_Component_Size_Clause (gnat_entity))
2346 && !Is_Bit_Packed_Array (gnat_entity)
2347 && !Has_Aliased_Components (gnat_entity)
2348 && !Strict_Alignment (Component_Type (gnat_entity))
2349 && TREE_CODE (gnu_type) == RECORD_TYPE
2350 && !TYPE_IS_FAT_POINTER_P (gnu_type)
2351 && host_integerp (TYPE_SIZE (gnu_type), 1))
2352 gnu_type = make_packable_type (gnu_type, false);
2354 /* Get and validate any specified Component_Size, but if Packed,
2355 ignore it since the front end will have taken care of it. */
2357 = validate_size (Component_Size (gnat_entity), gnu_type,
2359 (Is_Bit_Packed_Array (gnat_entity)
2360 ? TYPE_DECL : VAR_DECL), true,
2361 Has_Component_Size_Clause (gnat_entity));
2363 /* If the component type is a RECORD_TYPE that has a
2364 self-referential size, use the maximum size. */
2366 && TREE_CODE (gnu_type) == RECORD_TYPE
2367 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2368 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
2370 if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity))
2372 tree orig_gnu_type = gnu_type;
2373 unsigned int max_align;
2375 /* If an alignment is specified, use it as a cap on the
2376 component type so that it can be honored for the whole
2377 type. But ignore it for the original type of packed
2379 if (No (Packed_Array_Type (gnat_entity))
2380 && Known_Alignment (gnat_entity))
2381 max_align = validate_alignment (Alignment (gnat_entity),
2387 = make_type_from_size (gnu_type, gnu_comp_size, false);
2388 if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align)
2389 gnu_type = orig_gnu_type;
2391 orig_gnu_type = gnu_type;
2393 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
2394 gnat_entity, "C_PAD", false,
2397 /* If a padding record was made, declare it now since it
2398 will never be declared otherwise. This is necessary
2399 to ensure that its subtrees are properly marked. */
2400 if (gnu_type != orig_gnu_type)
2401 create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL,
2402 true, debug_info_p, gnat_entity);
2405 if (Has_Volatile_Components (Base_Type (gnat_entity)))
2406 gnu_type = build_qualified_type (gnu_type,
2407 (TYPE_QUALS (gnu_type)
2408 | TYPE_QUAL_VOLATILE));
2411 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
2412 TYPE_SIZE_UNIT (gnu_type));
2413 gnu_max_size = size_binop (MULT_EXPR,
2414 convert (bitsizetype, gnu_max_size),
2415 TYPE_SIZE (gnu_type));
2417 for (index = dim - 1; index >= 0; index --)
2419 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
2420 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
2421 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2422 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2425 /* Attach the TYPE_STUB_DECL in case we have a parallel type. */
2426 TYPE_STUB_DECL (gnu_type)
2427 = create_type_stub_decl (gnu_entity_name, gnu_type);
2429 /* If we are at file level and this is a multi-dimensional array, we
2430 need to make a variable corresponding to the stride of the
2431 inner dimensions. */
2432 if (global_bindings_p () && dim > 1)
2434 tree gnu_str_name = get_identifier ("ST");
2437 for (gnu_arr_type = TREE_TYPE (gnu_type);
2438 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2439 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2440 gnu_str_name = concat_name (gnu_str_name, "ST"))
2442 tree eltype = TREE_TYPE (gnu_arr_type);
2444 TYPE_SIZE (gnu_arr_type)
2445 = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type),
2446 gnat_entity, gnu_str_name,
2449 /* ??? For now, store the size as a multiple of the
2450 alignment of the element type in bytes so that we
2451 can see the alignment from the tree. */
2452 TYPE_SIZE_UNIT (gnu_arr_type)
2454 (MULT_EXPR, sizetype,
2455 elaborate_expression_1
2456 (build_binary_op (EXACT_DIV_EXPR, sizetype,
2457 TYPE_SIZE_UNIT (gnu_arr_type),
2458 size_int (TYPE_ALIGN (eltype)
2460 gnat_entity, concat_name (gnu_str_name, "A_U"),
2462 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2464 /* ??? create_type_decl is not invoked on the inner types so
2465 the MULT_EXPR node built above will never be marked. */
2466 mark_visited (&TYPE_SIZE_UNIT (gnu_arr_type));
2470 /* If we need to write out a record type giving the names of the
2471 bounds for debugging purposes, do it now and make the record
2472 type a parallel type. This is not needed for a packed array
2473 since the bounds are conveyed by the original array type. */
2474 if (need_index_type_struct
2476 && !Is_Packed_Array_Type (gnat_entity))
2478 tree gnu_bound_rec = make_node (RECORD_TYPE);
2479 tree gnu_field_list = NULL_TREE;
2482 TYPE_NAME (gnu_bound_rec)
2483 = create_concat_name (gnat_entity, "XA");
2485 for (index = dim - 1; index >= 0; index--)
2487 tree gnu_index = TYPE_INDEX_TYPE (gnu_index_type[index]);
2488 tree gnu_index_name = TYPE_NAME (gnu_index);
2490 if (TREE_CODE (gnu_index_name) == TYPE_DECL)
2491 gnu_index_name = DECL_NAME (gnu_index_name);
2493 /* Make sure to reference the types themselves, and not just
2494 their names, as the debugger may fall back on them. */
2495 gnu_field = create_field_decl (gnu_index_name, gnu_index,
2497 0, NULL_TREE, NULL_TREE, 0);
2498 TREE_CHAIN (gnu_field) = gnu_field_list;
2499 gnu_field_list = gnu_field;
2502 finish_record_type (gnu_bound_rec, gnu_field_list, 0, false);
2503 add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
2506 /* Otherwise, for a packed array, make the original array type a
2508 else if (debug_info_p
2509 && Is_Packed_Array_Type (gnat_entity)
2510 && present_gnu_tree (Original_Array_Type (gnat_entity)))
2511 add_parallel_type (TYPE_STUB_DECL (gnu_type),
2513 (Original_Array_Type (gnat_entity)));
2515 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2516 = (Convention (gnat_entity) == Convention_Fortran);
2517 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2518 = (Is_Packed_Array_Type (gnat_entity)
2519 && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity)));
2521 /* If our size depends on a placeholder and the maximum size doesn't
2522 overflow, use it. */
2523 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2524 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2525 && TREE_OVERFLOW (gnu_max_size))
2526 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2527 && TREE_OVERFLOW (gnu_max_size_unit))
2530 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2531 TYPE_SIZE (gnu_type));
2532 TYPE_SIZE_UNIT (gnu_type)
2533 = size_binop (MIN_EXPR, gnu_max_size_unit,
2534 TYPE_SIZE_UNIT (gnu_type));
2537 /* Set our alias set to that of our base type. This gives all
2538 array subtypes the same alias set. */
2539 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
2542 /* If this is a packed type, make this type the same as the packed
2543 array type, but do some adjusting in the type first. */
2544 if (Present (Packed_Array_Type (gnat_entity)))
2546 Entity_Id gnat_index;
2547 tree gnu_inner_type;
2549 /* First finish the type we had been making so that we output
2550 debugging information for it. */
2552 = build_qualified_type (gnu_type,
2553 (TYPE_QUALS (gnu_type)
2554 | (TYPE_QUAL_VOLATILE
2555 * Treat_As_Volatile (gnat_entity))));
2557 /* Make it artificial only if the base type was artificial as well.
2558 That's sort of "morally" true and will make it possible for the
2559 debugger to look it up by name in DWARF, which is necessary in
2560 order to decode the packed array type. */
2562 = create_type_decl (gnu_entity_name, gnu_type, attr_list,
2563 !Comes_From_Source (gnat_entity)
2564 && !Comes_From_Source (Etype (gnat_entity)),
2565 debug_info_p, gnat_entity);
2567 /* Save it as our equivalent in case the call below elaborates
2569 save_gnu_tree (gnat_entity, gnu_decl, false);
2571 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2573 this_made_decl = true;
2574 gnu_type = TREE_TYPE (gnu_decl);
2575 save_gnu_tree (gnat_entity, NULL_TREE, false);
2577 gnu_inner_type = gnu_type;
2578 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2579 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2580 || TYPE_IS_PADDING_P (gnu_inner_type)))
2581 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2583 /* We need to attach the index type to the type we just made so
2584 that the actual bounds can later be put into a template. */
2585 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2586 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2587 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2588 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2590 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2592 /* The TYPE_ACTUAL_BOUNDS field is overloaded with the
2593 TYPE_MODULUS for modular types so we make an extra
2594 subtype if necessary. */
2595 if (TYPE_MODULAR_P (gnu_inner_type))
2598 = make_unsigned_type (TYPE_PRECISION (gnu_inner_type));
2599 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2600 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2601 SET_TYPE_RM_MIN_VALUE (gnu_subtype,
2602 TYPE_MIN_VALUE (gnu_inner_type));
2603 SET_TYPE_RM_MAX_VALUE (gnu_subtype,
2604 TYPE_MAX_VALUE (gnu_inner_type));
2605 gnu_inner_type = gnu_subtype;
2608 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2610 #ifdef ENABLE_CHECKING
2611 /* Check for other cases of overloading. */
2612 gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner_type));
2616 /* ??? This is necessary to make sure that the container is
2617 allocated with a null tree upfront; otherwise, it could
2618 be allocated with an uninitialized tree that is accessed
2619 before being set below. See ada-tree.h for details. */
2620 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2622 for (gnat_index = First_Index (gnat_entity);
2623 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2624 SET_TYPE_ACTUAL_BOUNDS
2626 tree_cons (NULL_TREE,
2627 get_unpadded_type (Etype (gnat_index)),
2628 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2630 if (Convention (gnat_entity) != Convention_Fortran)
2631 SET_TYPE_ACTUAL_BOUNDS
2633 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2635 if (TREE_CODE (gnu_type) == RECORD_TYPE
2636 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2637 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2641 /* Abort if packed array with no packed array type field set. */
2643 gcc_assert (!Is_Packed (gnat_entity));
2647 case E_String_Literal_Subtype:
2648 /* Create the type for a string literal. */
2650 Entity_Id gnat_full_type
2651 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2652 && Present (Full_View (Etype (gnat_entity)))
2653 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2654 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2655 tree gnu_string_array_type
2656 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2657 tree gnu_string_index_type
2658 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2659 (TYPE_DOMAIN (gnu_string_array_type))));
2660 tree gnu_lower_bound
2661 = convert (gnu_string_index_type,
2662 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2663 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2664 tree gnu_length = ssize_int (length - 1);
2665 tree gnu_upper_bound
2666 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2668 convert (gnu_string_index_type, gnu_length));
2670 = create_index_type (convert (sizetype, gnu_lower_bound),
2671 convert (sizetype, gnu_upper_bound),
2672 create_range_type (gnu_string_index_type,
2678 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2680 if (array_type_has_nonaliased_component (gnat_entity, gnu_type))
2681 TYPE_NONALIASED_COMPONENT (gnu_type) = 1;
2682 relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY);
2686 /* Record Types and Subtypes
2688 The following fields are defined on record types:
2690 Has_Discriminants True if the record has discriminants
2691 First_Discriminant Points to head of list of discriminants
2692 First_Entity Points to head of list of fields
2693 Is_Tagged_Type True if the record is tagged
2695 Implementation of Ada records and discriminated records:
2697 A record type definition is transformed into the equivalent of a C
2698 struct definition. The fields that are the discriminants which are
2699 found in the Full_Type_Declaration node and the elements of the
2700 Component_List found in the Record_Type_Definition node. The
2701 Component_List can be a recursive structure since each Variant of
2702 the Variant_Part of the Component_List has a Component_List.
2704 Processing of a record type definition comprises starting the list of
2705 field declarations here from the discriminants and the calling the
2706 function components_to_record to add the rest of the fields from the
2707 component list and return the gnu type node. The function
2708 components_to_record will call itself recursively as it traverses
2712 if (Has_Complex_Representation (gnat_entity))
2715 = build_complex_type
2717 (Etype (Defining_Entity
2718 (First (Component_Items
2721 (Declaration_Node (gnat_entity)))))))));
2727 Node_Id full_definition = Declaration_Node (gnat_entity);
2728 Node_Id record_definition = Type_Definition (full_definition);
2729 Entity_Id gnat_field;
2731 tree gnu_field_list = NULL_TREE;
2732 tree gnu_get_parent;
2733 /* Set PACKED in keeping with gnat_to_gnu_field. */
2735 = Is_Packed (gnat_entity)
2737 : Component_Alignment (gnat_entity) == Calign_Storage_Unit
2739 : (Known_Alignment (gnat_entity)
2740 || (Strict_Alignment (gnat_entity)
2741 && Known_Static_Esize (gnat_entity)))
2744 bool has_rep = Has_Specified_Layout (gnat_entity);
2745 bool all_rep = has_rep;
2747 = (Is_Tagged_Type (gnat_entity)
2748 && Nkind (record_definition) == N_Derived_Type_Definition);
2749 bool is_unchecked_union = Is_Unchecked_Union (gnat_entity);
2751 /* See if all fields have a rep clause. Stop when we find one
2754 for (gnat_field = First_Entity (gnat_entity);
2755 Present (gnat_field);
2756 gnat_field = Next_Entity (gnat_field))
2757 if ((Ekind (gnat_field) == E_Component
2758 || Ekind (gnat_field) == E_Discriminant)
2759 && No (Component_Clause (gnat_field)))
2765 /* If this is a record extension, go a level further to find the
2766 record definition. Also, verify we have a Parent_Subtype. */
2769 if (!type_annotate_only
2770 || Present (Record_Extension_Part (record_definition)))
2771 record_definition = Record_Extension_Part (record_definition);
2773 gcc_assert (type_annotate_only
2774 || Present (Parent_Subtype (gnat_entity)));
2777 /* Make a node for the record. If we are not defining the record,
2778 suppress expanding incomplete types. */
2779 gnu_type = make_node (tree_code_for_record_type (gnat_entity));
2780 TYPE_NAME (gnu_type) = gnu_entity_name;
2781 TYPE_PACKED (gnu_type) = (packed != 0) || has_rep;
2785 defer_incomplete_level++;
2786 this_deferred = true;
2789 /* If both a size and rep clause was specified, put the size in
2790 the record type now so that it can get the proper mode. */
2791 if (has_rep && Known_Esize (gnat_entity))
2792 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2794 /* Always set the alignment here so that it can be used to
2795 set the mode, if it is making the alignment stricter. If
2796 it is invalid, it will be checked again below. If this is to
2797 be Atomic, choose a default alignment of a word unless we know
2798 the size and it's smaller. */
2799 if (Known_Alignment (gnat_entity))
2800 TYPE_ALIGN (gnu_type)
2801 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2802 else if (Is_Atomic (gnat_entity))
2803 TYPE_ALIGN (gnu_type)
2804 = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize);
2805 /* If a type needs strict alignment, the minimum size will be the
2806 type size instead of the RM size (see validate_size). Cap the
2807 alignment, lest it causes this type size to become too large. */
2808 else if (Strict_Alignment (gnat_entity)
2809 && Known_Static_Esize (gnat_entity))
2811 unsigned int raw_size = UI_To_Int (Esize (gnat_entity));
2812 unsigned int raw_align = raw_size & -raw_size;
2813 if (raw_align < BIGGEST_ALIGNMENT)
2814 TYPE_ALIGN (gnu_type) = raw_align;
2817 TYPE_ALIGN (gnu_type) = 0;
2819 /* If we have a Parent_Subtype, make a field for the parent. If
2820 this record has rep clauses, force the position to zero. */
2821 if (Present (Parent_Subtype (gnat_entity)))
2823 Entity_Id gnat_parent = Parent_Subtype (gnat_entity);
2826 /* A major complexity here is that the parent subtype will
2827 reference our discriminants in its Discriminant_Constraint
2828 list. But those must reference the parent component of this
2829 record which is of the parent subtype we have not built yet!
2830 To break the circle we first build a dummy COMPONENT_REF which
2831 represents the "get to the parent" operation and initialize
2832 each of those discriminants to a COMPONENT_REF of the above
2833 dummy parent referencing the corresponding discriminant of the
2834 base type of the parent subtype. */
2835 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2836 build0 (PLACEHOLDER_EXPR, gnu_type),
2837 build_decl (FIELD_DECL, NULL_TREE,
2841 if (Has_Discriminants (gnat_entity))
2842 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2843 Present (gnat_field);
2844 gnat_field = Next_Stored_Discriminant (gnat_field))
2845 if (Present (Corresponding_Discriminant (gnat_field)))
2848 build3 (COMPONENT_REF,
2849 get_unpadded_type (Etype (gnat_field)),
2851 gnat_to_gnu_field_decl (Corresponding_Discriminant
2856 /* Then we build the parent subtype. If it has discriminants but
2857 the type itself has unknown discriminants, this means that it
2858 doesn't contain information about how the discriminants are
2859 derived from those of the ancestor type, so it cannot be used
2860 directly. Instead it is built by cloning the parent subtype
2861 of the underlying record view of the type, for which the above
2862 derivation of discriminants has been made explicit. */
2863 if (Has_Discriminants (gnat_parent)
2864 && Has_Unknown_Discriminants (gnat_entity))
2866 Entity_Id gnat_uview = Underlying_Record_View (gnat_entity);
2868 /* If we are defining the type, the underlying record
2869 view must already have been elaborated at this point.
2870 Otherwise do it now as its parent subtype cannot be
2871 technically elaborated on its own. */
2873 gcc_assert (present_gnu_tree (gnat_uview));
2875 gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0);
2877 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview));
2879 /* Substitute the "get to the parent" of the type for that
2880 of its underlying record view in the cloned type. */
2881 for (gnat_field = First_Stored_Discriminant (gnat_uview);
2882 Present (gnat_field);
2883 gnat_field = Next_Stored_Discriminant (gnat_field))
2884 if (Present (Corresponding_Discriminant (gnat_field)))
2886 tree gnu_field = gnat_to_gnu_field_decl (gnat_field);
2888 = build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2889 gnu_get_parent, gnu_field, NULL_TREE);
2891 = substitute_in_type (gnu_parent, gnu_field, gnu_ref);
2895 gnu_parent = gnat_to_gnu_type (gnat_parent);
2897 /* Finally we fix up both kinds of twisted COMPONENT_REF we have
2898 initially built. The discriminants must reference the fields
2899 of the parent subtype and not those of its base type for the
2900 placeholder machinery to properly work. */
2901 if (Has_Discriminants (gnat_entity))
2902 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2903 Present (gnat_field);
2904 gnat_field = Next_Stored_Discriminant (gnat_field))
2905 if (Present (Corresponding_Discriminant (gnat_field)))
2907 Entity_Id field = Empty;
2908 for (field = First_Stored_Discriminant (gnat_parent);
2910 field = Next_Stored_Discriminant (field))
2911 if (same_discriminant_p (gnat_field, field))
2913 gcc_assert (Present (field));
2914 TREE_OPERAND (get_gnu_tree (gnat_field), 1)
2915 = gnat_to_gnu_field_decl (field);
2918 /* The "get to the parent" COMPONENT_REF must be given its
2920 TREE_TYPE (gnu_get_parent) = gnu_parent;
2922 /* ...and reference the _Parent field of this record. */
2924 = create_field_decl (get_identifier
2925 (Get_Name_String (Name_uParent)),
2926 gnu_parent, gnu_type, 0,
2927 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2928 has_rep ? bitsize_zero_node : 0, 1);
2929 DECL_INTERNAL_P (gnu_field) = 1;
2930 TREE_OPERAND (gnu_get_parent, 1) = gnu_field;
2931 TYPE_FIELDS (gnu_type) = gnu_field;
2934 /* Make the fields for the discriminants and put them into the record
2935 unless it's an Unchecked_Union. */
2936 if (Has_Discriminants (gnat_entity))
2937 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2938 Present (gnat_field);
2939 gnat_field = Next_Stored_Discriminant (gnat_field))
2941 /* If this is a record extension and this discriminant is the
2942 renaming of another discriminant, we've handled it above. */
2943 if (Present (Parent_Subtype (gnat_entity))
2944 && Present (Corresponding_Discriminant (gnat_field)))
2948 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2950 /* Make an expression using a PLACEHOLDER_EXPR from the
2951 FIELD_DECL node just created and link that with the
2952 corresponding GNAT defining identifier. */
2953 save_gnu_tree (gnat_field,
2954 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2955 build0 (PLACEHOLDER_EXPR, gnu_type),
2956 gnu_field, NULL_TREE),
2959 if (!is_unchecked_union)
2961 TREE_CHAIN (gnu_field) = gnu_field_list;
2962 gnu_field_list = gnu_field;
2966 /* Add the fields into the record type and finish it up. */
2967 components_to_record (gnu_type, Component_List (record_definition),
2968 gnu_field_list, packed, definition, NULL,
2969 false, all_rep, false, is_unchecked_union);
2971 /* We used to remove the associations of the discriminants and _Parent
2972 for validity checking but we may need them if there's a Freeze_Node
2973 for a subtype used in this record. */
2974 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2975 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2977 /* If it is a tagged record force the type to BLKmode to insure that
2978 these objects will always be put in memory. Likewise for limited
2980 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2981 SET_TYPE_MODE (gnu_type, BLKmode);
2983 /* Fill in locations of fields. */
2984 annotate_rep (gnat_entity, gnu_type);
2986 /* If there are any entities in the chain corresponding to components
2987 that we did not elaborate, ensure we elaborate their types if they
2989 for (gnat_temp = First_Entity (gnat_entity);
2990 Present (gnat_temp);
2991 gnat_temp = Next_Entity (gnat_temp))
2992 if ((Ekind (gnat_temp) == E_Component
2993 || Ekind (gnat_temp) == E_Discriminant)
2994 && Is_Itype (Etype (gnat_temp))
2995 && !present_gnu_tree (gnat_temp))
2996 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3000 case E_Class_Wide_Subtype:
3001 /* If an equivalent type is present, that is what we should use.
3002 Otherwise, fall through to handle this like a record subtype
3003 since it may have constraints. */
3004 if (gnat_equiv_type != gnat_entity)
3006 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
3007 maybe_present = true;
3011 /* ... fall through ... */
3013 case E_Record_Subtype:
3014 /* If Cloned_Subtype is Present it means this record subtype has
3015 identical layout to that type or subtype and we should use
3016 that GCC type for this one. The front end guarantees that
3017 the component list is shared. */
3018 if (Present (Cloned_Subtype (gnat_entity)))
3020 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
3022 maybe_present = true;
3026 /* Otherwise, first ensure the base type is elaborated. Then, if we are
3027 changing the type, make a new type with each field having the type of
3028 the field in the new subtype but the position computed by transforming
3029 every discriminant reference according to the constraints. We don't
3030 see any difference between private and non-private type here since
3031 derivations from types should have been deferred until the completion
3032 of the private type. */
3035 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
3036 tree gnu_base_type, gnu_orig_type;
3040 defer_incomplete_level++;
3041 this_deferred = true;
3044 /* Get the base type initially for its alignment and sizes.
3045 But if it is a padded type, we do all the other work with
3046 the unpadded type. */
3047 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
3049 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
3050 && TYPE_IS_PADDING_P (gnu_base_type))
3051 gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3053 gnu_orig_type = gnu_base_type;
3055 if (present_gnu_tree (gnat_entity))
3057 maybe_present = true;
3061 /* When the subtype has discriminants and these discriminants affect
3062 the initial shape it has inherited, factor them in. But for the
3063 of an Unchecked_Union (it must be an Itype), just return the type.
3065 We can't just test Is_Constrained because private subtypes without
3066 discriminants of types with discriminants with default expressions
3067 are Is_Constrained but aren't constrained! */
3068 if (IN (Ekind (gnat_base_type), Record_Kind)
3069 && !Is_Unchecked_Union (gnat_base_type)
3070 && !Is_For_Access_Subtype (gnat_entity)
3071 && Is_Constrained (gnat_entity)
3072 && Has_Discriminants (gnat_entity)
3073 && Present (Discriminant_Constraint (gnat_entity))
3074 && Stored_Constraint (gnat_entity) != No_Elist)
3077 = compute_field_positions (gnu_orig_type, NULL_TREE,
3078 size_zero_node, bitsize_zero_node,
3081 = build_subst_list (gnat_entity, gnat_base_type, definition);
3082 tree gnu_field_list = NULL_TREE, gnu_temp;
3083 Entity_Id gnat_field;
3085 gnu_type = make_node (RECORD_TYPE);
3086 TYPE_NAME (gnu_type) = gnu_entity_name;
3087 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3089 /* Set the size, alignment and alias set of the new type to
3090 match that of the old one, doing required substitutions.
3091 We do it this early because we need the size of the new
3092 type below to discard old fields if necessary. */
3093 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
3094 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
3095 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
3096 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
3097 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
3099 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3100 for (gnu_temp = gnu_subst_list;
3101 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3102 TYPE_SIZE (gnu_type)
3103 = substitute_in_expr (TYPE_SIZE (gnu_type),
3104 TREE_PURPOSE (gnu_temp),
3105 TREE_VALUE (gnu_temp));
3107 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
3108 for (gnu_temp = gnu_subst_list;
3109 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3110 TYPE_SIZE_UNIT (gnu_type)
3111 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
3112 TREE_PURPOSE (gnu_temp),
3113 TREE_VALUE (gnu_temp));
3115 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
3116 for (gnu_temp = gnu_subst_list;
3117 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3119 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3120 TREE_PURPOSE (gnu_temp),
3121 TREE_VALUE (gnu_temp)));
3123 for (gnat_field = First_Entity (gnat_entity);
3124 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3125 if ((Ekind (gnat_field) == E_Component
3126 || Ekind (gnat_field) == E_Discriminant)
3127 && Underlying_Type (Scope (Original_Record_Component
3130 && (No (Corresponding_Discriminant (gnat_field))
3131 || !Is_Tagged_Type (gnat_base_type)))
3133 Name_Id gnat_name = Chars (gnat_field);
3135 = gnat_to_gnu_field_decl
3136 (Original_Record_Component (gnat_field));
3139 (purpose_member (gnu_old_field, gnu_pos_list));
3140 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3141 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3142 tree gnu_field, gnu_field_type, gnu_size, gnu_new_pos;
3143 tree gnu_last = NULL_TREE;
3144 unsigned int offset_align
3146 (TREE_PURPOSE (TREE_VALUE (gnu_offset)), 1);
3148 /* If the type is the same, retrieve the GCC type from the
3149 old field to take into account possible adjustments. */
3150 if (Etype (gnat_field)
3151 == Etype (Original_Record_Component (gnat_field)))
3152 gnu_field_type = TREE_TYPE (gnu_old_field);
3154 gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
3156 gnu_size = TYPE_SIZE (gnu_field_type);
3158 /* If there was a component clause, the field types must be
3159 the same for the type and subtype, so copy the data from
3160 the old field to avoid recomputation here. Also if the
3161 field is justified modular and the optimization in
3162 gnat_to_gnu_field was applied. */
3163 if (Present (Component_Clause
3164 (Original_Record_Component (gnat_field)))
3165 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3166 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3167 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3168 == TREE_TYPE (gnu_old_field)))
3170 gnu_size = DECL_SIZE (gnu_old_field);
3171 gnu_field_type = TREE_TYPE (gnu_old_field);
3174 /* If the old field was packed and of constant size, we
3175 have to get the old size here, as it might differ from
3176 what the Etype conveys and the latter might overlap
3177 onto the following field. Try to arrange the type for
3178 possible better packing along the way. */
3179 else if (DECL_PACKED (gnu_old_field)
3180 && TREE_CODE (DECL_SIZE (gnu_old_field))
3183 gnu_size = DECL_SIZE (gnu_old_field);
3184 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3185 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
3186 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3188 = make_packable_type (gnu_field_type, true);
3191 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3192 for (gnu_temp = gnu_subst_list;
3193 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3194 gnu_pos = substitute_in_expr (gnu_pos,
3195 TREE_PURPOSE (gnu_temp),
3196 TREE_VALUE (gnu_temp));
3198 /* If the position is now a constant, we can set it as the
3199 position of the field when we make it. Otherwise, we
3200 need to deal with it specially below. */
3201 if (TREE_CONSTANT (gnu_pos))
3203 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3205 /* Discard old fields that are outside the new type.
3206 This avoids confusing code scanning it to decide
3207 how to pass it to functions on some platforms. */
3208 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3209 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3210 && !integer_zerop (gnu_size)
3211 && !tree_int_cst_lt (gnu_new_pos,
3212 TYPE_SIZE (gnu_type)))
3216 gnu_new_pos = NULL_TREE;
3220 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3221 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3222 !DECL_NONADDRESSABLE_P (gnu_old_field));
3224 if (!TREE_CONSTANT (gnu_pos))
3226 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3227 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3228 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3229 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3230 DECL_SIZE (gnu_field) = gnu_size;
3231 DECL_SIZE_UNIT (gnu_field)
3232 = convert (sizetype,
3233 size_binop (CEIL_DIV_EXPR, gnu_size,
3234 bitsize_unit_node));
3235 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3238 DECL_INTERNAL_P (gnu_field)
3239 = DECL_INTERNAL_P (gnu_old_field);
3240 SET_DECL_ORIGINAL_FIELD
3241 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3242 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3244 DECL_DISCRIMINANT_NUMBER (gnu_field)
3245 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3246 TREE_THIS_VOLATILE (gnu_field)
3247 = TREE_THIS_VOLATILE (gnu_old_field);
3249 /* To match the layout crafted in components_to_record,
3250 if this is the _Tag or _Parent field, put it before
3251 any other fields. */
3252 if (gnat_name == Name_uTag || gnat_name == Name_uParent)
3253 gnu_field_list = chainon (gnu_field_list, gnu_field);
3255 /* Similarly, if this is the _Controller field, put
3256 it before the other fields except for the _Tag or
3258 else if (gnat_name == Name_uController && gnu_last)
3260 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
3261 TREE_CHAIN (gnu_last) = gnu_field;
3264 /* Otherwise, if this is a regular field, put it after
3265 the other fields. */
3268 TREE_CHAIN (gnu_field) = gnu_field_list;
3269 gnu_field_list = gnu_field;
3271 gnu_last = gnu_field;
3274 save_gnu_tree (gnat_field, gnu_field, false);
3277 /* Now go through the entities again looking for Itypes that
3278 we have not elaborated but should (e.g., Etypes of fields
3279 that have Original_Components). */
3280 for (gnat_field = First_Entity (gnat_entity);
3281 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3282 if ((Ekind (gnat_field) == E_Discriminant
3283 || Ekind (gnat_field) == E_Component)
3284 && !present_gnu_tree (Etype (gnat_field)))
3285 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3287 /* Do not finalize it since we're going to modify it below. */
3288 gnu_field_list = nreverse (gnu_field_list);
3289 finish_record_type (gnu_type, gnu_field_list, 2, true);
3291 /* Finalize size and mode. */
3292 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3293 TYPE_SIZE_UNIT (gnu_type)
3294 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3296 compute_record_mode (gnu_type);
3298 /* Fill in locations of fields. */
3299 annotate_rep (gnat_entity, gnu_type);
3301 /* We've built a new type, make an XVS type to show what this
3302 is a subtype of. Some debuggers require the XVS type to be
3303 output first, so do it in that order. */
3306 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3307 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
3309 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
3310 gnu_orig_name = DECL_NAME (gnu_orig_name);
3312 TYPE_NAME (gnu_subtype_marker)
3313 = create_concat_name (gnat_entity, "XVS");
3314 finish_record_type (gnu_subtype_marker,
3315 create_field_decl (gnu_orig_name,
3322 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3323 gnu_subtype_marker);
3326 /* Now we can finalize it. */
3327 rest_of_record_type_compilation (gnu_type);
3330 /* Otherwise, go down all the components in the new type and make
3331 them equivalent to those in the base type. */
3334 gnu_type = gnu_orig_type;
3336 for (gnat_temp = First_Entity (gnat_entity);
3337 Present (gnat_temp);
3338 gnat_temp = Next_Entity (gnat_temp))
3339 if ((Ekind (gnat_temp) == E_Discriminant
3340 && !Is_Unchecked_Union (gnat_base_type))
3341 || Ekind (gnat_temp) == E_Component)
3342 save_gnu_tree (gnat_temp,
3343 gnat_to_gnu_field_decl
3344 (Original_Record_Component (gnat_temp)),
3350 case E_Access_Subprogram_Type:
3351 /* Use the special descriptor type for dispatch tables if needed,
3352 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3353 Note that we are only required to do so for static tables in
3354 order to be compatible with the C++ ABI, but Ada 2005 allows
3355 to extend library level tagged types at the local level so
3356 we do it in the non-static case as well. */
3357 if (TARGET_VTABLE_USES_DESCRIPTORS
3358 && Is_Dispatch_Table_Entity (gnat_entity))
3360 gnu_type = fdesc_type_node;
3361 gnu_size = TYPE_SIZE (gnu_type);
3365 /* ... fall through ... */
3367 case E_Anonymous_Access_Subprogram_Type:
3368 /* If we are not defining this entity, and we have incomplete
3369 entities being processed above us, make a dummy type and
3370 fill it in later. */
3371 if (!definition && defer_incomplete_level != 0)
3373 struct incomplete *p
3374 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3377 = build_pointer_type
3378 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3379 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3380 !Comes_From_Source (gnat_entity),
3381 debug_info_p, gnat_entity);
3382 this_made_decl = true;
3383 gnu_type = TREE_TYPE (gnu_decl);
3384 save_gnu_tree (gnat_entity, gnu_decl, false);
3387 p->old_type = TREE_TYPE (gnu_type);
3388 p->full_type = Directly_Designated_Type (gnat_entity);
3389 p->next = defer_incomplete_list;
3390 defer_incomplete_list = p;
3394 /* ... fall through ... */
3396 case E_Allocator_Type:
3398 case E_Access_Attribute_Type:
3399 case E_Anonymous_Access_Type:
3400 case E_General_Access_Type:
3402 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3403 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3404 bool is_from_limited_with
3405 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3406 && From_With_Type (gnat_desig_equiv));
3408 /* Get the "full view" of this entity. If this is an incomplete
3409 entity from a limited with, treat its non-limited view as the full
3410 view. Otherwise, if this is an incomplete or private type, use the
3411 full view. In the former case, we might point to a private type,
3412 in which case, we need its full view. Also, we want to look at the
3413 actual type used for the representation, so this takes a total of
3415 Entity_Id gnat_desig_full_direct_first
3416 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3417 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3418 ? Full_View (gnat_desig_equiv) : Empty));
3419 Entity_Id gnat_desig_full_direct
3420 = ((is_from_limited_with
3421 && Present (gnat_desig_full_direct_first)
3422 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3423 ? Full_View (gnat_desig_full_direct_first)
3424 : gnat_desig_full_direct_first);
3425 Entity_Id gnat_desig_full
3426 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3428 /* This the type actually used to represent the designated type,
3429 either gnat_desig_full or gnat_desig_equiv. */
3430 Entity_Id gnat_desig_rep;
3432 /* True if this is a pointer to an unconstrained array. */
3433 bool is_unconstrained_array;
3435 /* We want to know if we'll be seeing the freeze node for any
3436 incomplete type we may be pointing to. */
3438 = (Present (gnat_desig_full)
3439 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3440 : In_Extended_Main_Code_Unit (gnat_desig_type));
3442 /* True if we make a dummy type here. */
3443 bool got_fat_p = false;
3444 /* True if the dummy is a fat pointer. */
3445 bool made_dummy = false;
3446 tree gnu_desig_type = NULL_TREE;
3447 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3449 if (!targetm.valid_pointer_mode (p_mode))
3452 /* If either the designated type or its full view is an unconstrained
3453 array subtype, replace it with the type it's a subtype of. This
3454 avoids problems with multiple copies of unconstrained array types.
3455 Likewise, if the designated type is a subtype of an incomplete
3456 record type, use the parent type to avoid order of elaboration
3457 issues. This can lose some code efficiency, but there is no
3459 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3460 && ! Is_Constrained (gnat_desig_equiv))
3461 gnat_desig_equiv = Etype (gnat_desig_equiv);
3462 if (Present (gnat_desig_full)
3463 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3464 && ! Is_Constrained (gnat_desig_full))
3465 || (Ekind (gnat_desig_full) == E_Record_Subtype
3466 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3467 gnat_desig_full = Etype (gnat_desig_full);
3469 /* Now set the type that actually marks the representation of
3470 the designated type and also flag whether we have a unconstrained
3472 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3473 is_unconstrained_array
3474 = (Is_Array_Type (gnat_desig_rep)
3475 && ! Is_Constrained (gnat_desig_rep));
3477 /* If we are pointing to an incomplete type whose completion is an
3478 unconstrained array, make a fat pointer type. The two types in our
3479 fields will be pointers to dummy nodes and will be replaced in
3480 update_pointer_to. Similarly, if the type itself is a dummy type or
3481 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3482 in case we have any thin pointers to it. */
3483 if (is_unconstrained_array
3484 && (Present (gnat_desig_full)
3485 || (present_gnu_tree (gnat_desig_equiv)
3486 && TYPE_IS_DUMMY_P (TREE_TYPE
3487 (get_gnu_tree (gnat_desig_equiv))))
3488 || (No (gnat_desig_full) && ! in_main_unit
3489 && defer_incomplete_level != 0
3490 && ! present_gnu_tree (gnat_desig_equiv))
3491 || (in_main_unit && is_from_limited_with
3492 && Present (Freeze_Node (gnat_desig_rep)))))
3496 if (present_gnu_tree (gnat_desig_rep))
3497 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3500 gnu_old = make_dummy_type (gnat_desig_rep);
3502 /* Show the dummy we get will be a fat pointer. */
3503 got_fat_p = made_dummy = true;
3506 /* If the call above got something that has a pointer, that
3507 pointer is our type. This could have happened either
3508 because the type was elaborated or because somebody
3509 else executed the code below. */
3510 gnu_type = TYPE_POINTER_TO (gnu_old);
3513 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3514 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3515 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3516 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3519 TYPE_NAME (gnu_template_type)
3520 = create_concat_name (gnat_desig_equiv, "XUB");
3521 TYPE_DUMMY_P (gnu_template_type) = 1;
3523 TYPE_NAME (gnu_array_type)
3524 = create_concat_name (gnat_desig_equiv, "XUA");
3525 TYPE_DUMMY_P (gnu_array_type) = 1;
3527 gnu_type = make_node (RECORD_TYPE);
3528 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3529 TYPE_POINTER_TO (gnu_old) = gnu_type;
3531 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3533 = chainon (chainon (NULL_TREE,
3535 (get_identifier ("P_ARRAY"),
3537 gnu_type, 0, 0, 0, 0)),
3538 create_field_decl (get_identifier ("P_BOUNDS"),
3540 gnu_type, 0, 0, 0, 0));
3542 /* Make sure we can place this into a register. */
3543 TYPE_ALIGN (gnu_type)
3544 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3545 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3547 /* Do not finalize this record type since the types of
3548 its fields are incomplete. */
3549 finish_record_type (gnu_type, fields, 0, true);
3551 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3552 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3553 = create_concat_name (gnat_desig_equiv, "XUT");
3554 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3558 /* If we already know what the full type is, use it. */
3559 else if (Present (gnat_desig_full)
3560 && present_gnu_tree (gnat_desig_full))
3561 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3563 /* Get the type of the thing we are to point to and build a pointer
3564 to it. If it is a reference to an incomplete or private type with a
3565 full view that is a record, make a dummy type node and get the
3566 actual type later when we have verified it is safe. */
3567 else if ((! in_main_unit
3568 && ! present_gnu_tree (gnat_desig_equiv)
3569 && Present (gnat_desig_full)
3570 && ! present_gnu_tree (gnat_desig_full)
3571 && Is_Record_Type (gnat_desig_full))
3572 /* Likewise if we are pointing to a record or array and we
3573 are to defer elaborating incomplete types. We do this
3574 since this access type may be the full view of some
3575 private type. Note that the unconstrained array case is
3577 || ((! in_main_unit || imported_p)
3578 && defer_incomplete_level != 0
3579 && ! present_gnu_tree (gnat_desig_equiv)
3580 && ((Is_Record_Type (gnat_desig_rep)
3581 || Is_Array_Type (gnat_desig_rep))))
3582 /* If this is a reference from a limited_with type back to our
3583 main unit and there's a Freeze_Node for it, either we have
3584 already processed the declaration and made the dummy type,
3585 in which case we just reuse the latter, or we have not yet,
3586 in which case we make the dummy type and it will be reused
3587 when the declaration is processed. In both cases, the
3588 pointer eventually created below will be automatically
3589 adjusted when the Freeze_Node is processed. Note that the
3590 unconstrained array case is handled above. */
3591 || (in_main_unit && is_from_limited_with
3592 && Present (Freeze_Node (gnat_desig_rep))))
3594 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3598 /* Otherwise handle the case of a pointer to itself. */
3599 else if (gnat_desig_equiv == gnat_entity)
3602 = build_pointer_type_for_mode (void_type_node, p_mode,
3603 No_Strict_Aliasing (gnat_entity));
3604 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3607 /* If expansion is disabled, the equivalent type of a concurrent
3608 type is absent, so build a dummy pointer type. */
3609 else if (type_annotate_only && No (gnat_desig_equiv))
3610 gnu_type = ptr_void_type_node;
3612 /* Finally, handle the straightforward case where we can just
3613 elaborate our designated type and point to it. */
3615 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3617 /* It is possible that a call to gnat_to_gnu_type above resolved our
3618 type. If so, just return it. */
3619 if (present_gnu_tree (gnat_entity))
3621 maybe_present = true;
3625 /* If we have a GCC type for the designated type, possibly modify it
3626 if we are pointing only to constant objects and then make a pointer
3627 to it. Don't do this for unconstrained arrays. */
3628 if (!gnu_type && gnu_desig_type)
3630 if (Is_Access_Constant (gnat_entity)
3631 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3634 = build_qualified_type
3636 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3638 /* Some extra processing is required if we are building a
3639 pointer to an incomplete type (in the GCC sense). We might
3640 have such a type if we just made a dummy, or directly out
3641 of the call to gnat_to_gnu_type above if we are processing
3642 an access type for a record component designating the
3643 record type itself. */
3644 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3646 /* We must ensure that the pointer to variant we make will
3647 be processed by update_pointer_to when the initial type
3648 is completed. Pretend we made a dummy and let further
3649 processing act as usual. */
3652 /* We must ensure that update_pointer_to will not retrieve
3653 the dummy variant when building a properly qualified
3654 version of the complete type. We take advantage of the
3655 fact that get_qualified_type is requiring TYPE_NAMEs to
3656 match to influence build_qualified_type and then also
3657 update_pointer_to here. */
3658 TYPE_NAME (gnu_desig_type)
3659 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3664 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3665 No_Strict_Aliasing (gnat_entity));
3668 /* If we are not defining this object and we made a dummy pointer,
3669 save our current definition, evaluate the actual type, and replace
3670 the tentative type we made with the actual one. If we are to defer
3671 actually looking up the actual type, make an entry in the
3672 deferred list. If this is from a limited with, we have to defer
3673 to the end of the current spec in two cases: first if the
3674 designated type is in the current unit and second if the access
3676 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3679 = TYPE_FAT_POINTER_P (gnu_type)
3680 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3682 if (esize == POINTER_SIZE
3683 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3685 = build_pointer_type
3686 (TYPE_OBJECT_RECORD_TYPE
3687 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3689 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3690 !Comes_From_Source (gnat_entity),
3691 debug_info_p, gnat_entity);
3692 this_made_decl = true;
3693 gnu_type = TREE_TYPE (gnu_decl);
3694 save_gnu_tree (gnat_entity, gnu_decl, false);
3697 if (defer_incomplete_level == 0
3698 && ! (is_from_limited_with
3700 || In_Extended_Main_Code_Unit (gnat_entity))))
3701 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3702 gnat_to_gnu_type (gnat_desig_equiv));
3704 /* Note that the call to gnat_to_gnu_type here might have
3705 updated gnu_old_type directly, in which case it is not a
3706 dummy type any more when we get into update_pointer_to.
3708 This may happen for instance when the designated type is a
3709 record type, because their elaboration starts with an
3710 initial node from make_dummy_type, which may yield the same
3711 node as the one we got.
3713 Besides, variants of this non-dummy type might have been
3714 created along the way. update_pointer_to is expected to
3715 properly take care of those situations. */
3718 struct incomplete *p
3719 = (struct incomplete *) xmalloc (sizeof
3720 (struct incomplete));
3721 struct incomplete **head
3722 = (is_from_limited_with
3724 || In_Extended_Main_Code_Unit (gnat_entity))
3725 ? &defer_limited_with : &defer_incomplete_list);
3727 p->old_type = gnu_old_type;
3728 p->full_type = gnat_desig_equiv;
3736 case E_Access_Protected_Subprogram_Type:
3737 case E_Anonymous_Access_Protected_Subprogram_Type:
3738 if (type_annotate_only && No (gnat_equiv_type))
3739 gnu_type = ptr_void_type_node;
3742 /* The runtime representation is the equivalent type. */
3743 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3744 maybe_present = true;
3747 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3748 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3749 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3750 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3751 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3756 case E_Access_Subtype:
3758 /* We treat this as identical to its base type; any constraint is
3759 meaningful only to the front end.
3761 The designated type must be elaborated as well, if it does
3762 not have its own freeze node. Designated (sub)types created
3763 for constrained components of records with discriminants are
3764 not frozen by the front end and thus not elaborated by gigi,
3765 because their use may appear before the base type is frozen,
3766 and because it is not clear that they are needed anywhere in
3767 Gigi. With the current model, there is no correct place where
3768 they could be elaborated. */
3770 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3771 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3772 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3773 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3774 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3776 /* If we are not defining this entity, and we have incomplete
3777 entities being processed above us, make a dummy type and
3778 elaborate it later. */
3779 if (!definition && defer_incomplete_level != 0)
3781 struct incomplete *p
3782 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3784 = build_pointer_type
3785 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3787 p->old_type = TREE_TYPE (gnu_ptr_type);
3788 p->full_type = Directly_Designated_Type (gnat_entity);
3789 p->next = defer_incomplete_list;
3790 defer_incomplete_list = p;
3792 else if (!IN (Ekind (Base_Type
3793 (Directly_Designated_Type (gnat_entity))),
3794 Incomplete_Or_Private_Kind))
3795 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3799 maybe_present = true;
3802 /* Subprogram Entities
3804 The following access functions are defined for subprograms (functions
3807 First_Formal The first formal parameter.
3808 Is_Imported Indicates that the subprogram has appeared in
3809 an INTERFACE or IMPORT pragma. For now we
3810 assume that the external language is C.
3811 Is_Exported Likewise but for an EXPORT pragma.
3812 Is_Inlined True if the subprogram is to be inlined.
3814 In addition for function subprograms we have:
3816 Etype Return type of the function.
3818 Each parameter is first checked by calling must_pass_by_ref on its
3819 type to determine if it is passed by reference. For parameters which
3820 are copied in, if they are Ada In Out or Out parameters, their return
3821 value becomes part of a record which becomes the return type of the
3822 function (C function - note that this applies only to Ada procedures
3823 so there is no Ada return type). Additional code to store back the
3824 parameters will be generated on the caller side. This transformation
3825 is done here, not in the front-end.
3827 The intended result of the transformation can be seen from the
3828 equivalent source rewritings that follow:
3830 struct temp {int a,b};
3831 procedure P (A,B: In Out ...) is temp P (int A,B)
3834 end P; return {A,B};
3841 For subprogram types we need to perform mainly the same conversions to
3842 GCC form that are needed for procedures and function declarations. The
3843 only difference is that at the end, we make a type declaration instead
3844 of a function declaration. */
3846 case E_Subprogram_Type:
3850 /* The first GCC parameter declaration (a PARM_DECL node). The
3851 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3852 actually is the head of this parameter list. */
3853 tree gnu_param_list = NULL_TREE;
3854 /* Likewise for the stub associated with an exported procedure. */
3855 tree gnu_stub_param_list = NULL_TREE;
3856 /* The type returned by a function. If the subprogram is a procedure
3857 this type should be void_type_node. */
3858 tree gnu_return_type = void_type_node;
3859 /* List of fields in return type of procedure with copy-in copy-out
3861 tree gnu_field_list = NULL_TREE;
3862 /* Non-null for subprograms containing parameters passed by copy-in
3863 copy-out (Ada In Out or Out parameters not passed by reference),
3864 in which case it is the list of nodes used to specify the values of
3865 the in out/out parameters that are returned as a record upon
3866 procedure return. The TREE_PURPOSE of an element of this list is
3867 a field of the record and the TREE_VALUE is the PARM_DECL
3868 corresponding to that field. This list will be saved in the
3869 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3870 tree gnu_return_list = NULL_TREE;
3871 /* If an import pragma asks to map this subprogram to a GCC builtin,
3872 this is the builtin DECL node. */
3873 tree gnu_builtin_decl = NULL_TREE;
3874 /* For the stub associated with an exported procedure. */
3875 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3876 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3877 Entity_Id gnat_param;
3878 bool inline_flag = Is_Inlined (gnat_entity);
3879 bool public_flag = Is_Public (gnat_entity) || imported_p;
3881 = (Is_Public (gnat_entity) && !definition) || imported_p;
3883 /* The semantics of "pure" in Ada essentially matches that of "const"
3884 in the back-end. In particular, both properties are orthogonal to
3885 the "nothrow" property if the EH circuitry is explicit in the
3886 internal representation of the back-end. If we are to completely
3887 hide the EH circuitry from it, we need to declare that calls to pure
3888 Ada subprograms that can throw have side effects since they can
3889 trigger an "abnormal" transfer of control flow; thus they can be
3890 neither "const" nor "pure" in the back-end sense. */
3892 = (Exception_Mechanism == Back_End_Exceptions
3893 && Is_Pure (gnat_entity));
3895 bool volatile_flag = No_Return (gnat_entity);
3896 bool returns_by_ref = false;
3897 bool returns_unconstrained = false;
3898 bool returns_by_target_ptr = false;
3899 bool has_copy_in_out = false;
3900 bool has_stub = false;
3903 /* A parameter may refer to this type, so defer completion of any
3904 incomplete types. */
3905 if (kind == E_Subprogram_Type && !definition)
3907 defer_incomplete_level++;
3908 this_deferred = true;
3911 /* If the subprogram has an alias, it is probably inherited, so
3912 we can use the original one. If the original "subprogram"
3913 is actually an enumeration literal, it may be the first use
3914 of its type, so we must elaborate that type now. */
3915 if (Present (Alias (gnat_entity)))
3917 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3918 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3920 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3923 /* Elaborate any Itypes in the parameters of this entity. */
3924 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3925 Present (gnat_temp);
3926 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3927 if (Is_Itype (Etype (gnat_temp)))
3928 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3933 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3934 corresponding DECL node.
3936 We still want the parameter associations to take place because the
3937 proper generation of calls depends on it (a GNAT parameter without
3938 a corresponding GCC tree has a very specific meaning), so we don't
3940 if (Convention (gnat_entity) == Convention_Intrinsic)
3941 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3943 /* ??? What if we don't find the builtin node above ? warn ? err ?
3944 In the current state we neither warn nor err, and calls will just
3945 be handled as for regular subprograms. */
3947 if (kind == E_Function || kind == E_Subprogram_Type)
3948 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3950 /* If this function returns by reference, make the actual
3951 return type of this function the pointer and mark the decl. */
3952 if (Returns_By_Ref (gnat_entity))
3954 returns_by_ref = true;
3955 gnu_return_type = build_pointer_type (gnu_return_type);
3958 /* If the Mechanism is By_Reference, ensure the return type uses
3959 the machine's by-reference mechanism, which may not the same
3960 as above (e.g., it might be by passing a fake parameter). */
3961 else if (kind == E_Function
3962 && Mechanism (gnat_entity) == By_Reference)
3964 TREE_ADDRESSABLE (gnu_return_type) = 1;
3966 /* We expect this bit to be reset by gigi shortly, so can avoid a
3967 type node copy here. This actually also prevents troubles with
3968 the generation of debug information for the function, because
3969 we might have issued such info for this type already, and would
3970 be attaching a distinct type node to the function if we made a
3974 /* If we are supposed to return an unconstrained array,
3975 actually return a fat pointer and make a note of that. Return
3976 a pointer to an unconstrained record of variable size. */
3977 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3979 gnu_return_type = TREE_TYPE (gnu_return_type);
3980 returns_unconstrained = true;
3983 /* If the type requires a transient scope, the result is allocated
3984 on the secondary stack, so the result type of the function is
3986 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3988 gnu_return_type = build_pointer_type (gnu_return_type);
3989 returns_unconstrained = true;
3992 /* If the type is a padded type and the underlying type would not
3993 be passed by reference or this function has a foreign convention,
3994 return the underlying type. */
3995 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3996 && TYPE_IS_PADDING_P (gnu_return_type)
3997 && (!default_pass_by_ref (TREE_TYPE
3998 (TYPE_FIELDS (gnu_return_type)))
3999 || Has_Foreign_Convention (gnat_entity)))
4000 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
4002 /* If the return type has a non-constant size, we convert the function
4003 into a procedure and its caller will pass a pointer to an object as
4004 the first parameter when we call the function. This can happen for
4005 an unconstrained type with a maximum size or a constrained type with
4006 a size not known at compile time. */
4007 if (TYPE_SIZE_UNIT (gnu_return_type)
4008 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
4010 returns_by_target_ptr = true;
4012 = create_param_decl (get_identifier ("TARGET"),
4013 build_reference_type (gnu_return_type),
4015 gnu_return_type = void_type_node;
4018 /* If the return type has a size that overflows, we cannot have
4019 a function that returns that type. This usage doesn't make
4020 sense anyway, so give an error here. */
4021 if (TYPE_SIZE_UNIT (gnu_return_type)
4022 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
4023 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
4025 post_error ("cannot return type whose size overflows",
4027 gnu_return_type = copy_node (gnu_return_type);
4028 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
4029 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
4030 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
4031 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
4034 /* Look at all our parameters and get the type of
4035 each. While doing this, build a copy-out structure if
4038 /* Loop over the parameters and get their associated GCC tree.
4039 While doing this, build a copy-out structure if we need one. */
4040 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
4041 Present (gnat_param);
4042 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
4044 tree gnu_param_name = get_entity_name (gnat_param);
4045 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4046 tree gnu_param, gnu_field;
4047 bool copy_in_copy_out = false;
4048 Mechanism_Type mech = Mechanism (gnat_param);
4050 /* Builtins are expanded inline and there is no real call sequence
4051 involved. So the type expected by the underlying expander is
4052 always the type of each argument "as is". */
4053 if (gnu_builtin_decl)
4055 /* Handle the first parameter of a valued procedure specially. */
4056 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
4057 mech = By_Copy_Return;
4058 /* Otherwise, see if a Mechanism was supplied that forced this
4059 parameter to be passed one way or another. */
4060 else if (mech == Default
4061 || mech == By_Copy || mech == By_Reference)
4063 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4064 mech = By_Descriptor;
4066 else if (By_Short_Descriptor_Last <= mech &&
4067 mech <= By_Short_Descriptor)
4068 mech = By_Short_Descriptor;
4072 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4073 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4074 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4076 mech = By_Reference;
4082 post_error ("unsupported mechanism for&", gnat_param);
4087 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4088 Has_Foreign_Convention (gnat_entity),
4091 /* We are returned either a PARM_DECL or a type if no parameter
4092 needs to be passed; in either case, adjust the type. */
4093 if (DECL_P (gnu_param))
4094 gnu_param_type = TREE_TYPE (gnu_param);
4097 gnu_param_type = gnu_param;
4098 gnu_param = NULL_TREE;
4103 /* If it's an exported subprogram, we build a parameter list
4104 in parallel, in case we need to emit a stub for it. */
4105 if (Is_Exported (gnat_entity))
4108 = chainon (gnu_param, gnu_stub_param_list);
4109 /* Change By_Descriptor parameter to By_Reference for
4110 the internal version of an exported subprogram. */
4111 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4114 = gnat_to_gnu_param (gnat_param, By_Reference,
4120 gnu_param = copy_node (gnu_param);
4123 gnu_param_list = chainon (gnu_param, gnu_param_list);
4124 Sloc_to_locus (Sloc (gnat_param),
4125 &DECL_SOURCE_LOCATION (gnu_param));
4126 save_gnu_tree (gnat_param, gnu_param, false);
4128 /* If a parameter is a pointer, this function may modify
4129 memory through it and thus shouldn't be considered
4130 a const function. Also, the memory may be modified
4131 between two calls, so they can't be CSE'ed. The latter
4132 case also handles by-ref parameters. */
4133 if (POINTER_TYPE_P (gnu_param_type)
4134 || TYPE_FAT_POINTER_P (gnu_param_type))
4138 if (copy_in_copy_out)
4140 if (!has_copy_in_out)
4142 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4143 gnu_return_type = make_node (RECORD_TYPE);
4144 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4145 has_copy_in_out = true;
4148 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4149 gnu_return_type, 0, 0, 0, 0);
4150 Sloc_to_locus (Sloc (gnat_param),
4151 &DECL_SOURCE_LOCATION (gnu_field));
4152 TREE_CHAIN (gnu_field) = gnu_field_list;
4153 gnu_field_list = gnu_field;
4154 gnu_return_list = tree_cons (gnu_field, gnu_param,
4159 /* Do not compute record for out parameters if subprogram is
4160 stubbed since structures are incomplete for the back-end. */
4161 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4162 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4165 /* If we have a CICO list but it has only one entry, we convert
4166 this function into a function that simply returns that one
4168 if (list_length (gnu_return_list) == 1)
4169 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
4171 if (Has_Stdcall_Convention (gnat_entity))
4172 prepend_one_attribute_to
4173 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4174 get_identifier ("stdcall"), NULL_TREE,
4177 /* If we are on a target where stack realignment is needed for 'main'
4178 to honor GCC's implicit expectations (stack alignment greater than
4179 what the base ABI guarantees), ensure we do the same for foreign
4180 convention subprograms as they might be used as callbacks from code
4181 breaking such expectations. Note that this applies to task entry
4182 points in particular. */
4183 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4184 && Has_Foreign_Convention (gnat_entity))
4185 prepend_one_attribute_to
4186 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4187 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4190 /* The lists have been built in reverse. */
4191 gnu_param_list = nreverse (gnu_param_list);
4193 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4194 gnu_return_list = nreverse (gnu_return_list);
4196 if (Ekind (gnat_entity) == E_Function)
4197 Set_Mechanism (gnat_entity,
4198 (returns_by_ref || returns_unconstrained
4199 ? By_Reference : By_Copy));
4201 = create_subprog_type (gnu_return_type, gnu_param_list,
4202 gnu_return_list, returns_unconstrained,
4203 returns_by_ref, returns_by_target_ptr);
4207 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4208 gnu_return_list, returns_unconstrained,
4209 returns_by_ref, returns_by_target_ptr);
4211 /* A subprogram (something that doesn't return anything) shouldn't
4212 be considered const since there would be no reason for such a
4213 subprogram. Note that procedures with Out (or In Out) parameters
4214 have already been converted into a function with a return type. */
4215 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4219 = build_qualified_type (gnu_type,
4220 TYPE_QUALS (gnu_type)
4221 | (TYPE_QUAL_CONST * const_flag)
4222 | (TYPE_QUAL_VOLATILE * volatile_flag));
4224 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4228 = build_qualified_type (gnu_stub_type,
4229 TYPE_QUALS (gnu_stub_type)
4230 | (TYPE_QUAL_CONST * const_flag)
4231 | (TYPE_QUAL_VOLATILE * volatile_flag));
4233 /* If we have a builtin decl for that function, check the signatures
4234 compatibilities. If the signatures are compatible, use the builtin
4235 decl. If they are not, we expect the checker predicate to have
4236 posted the appropriate errors, and just continue with what we have
4238 if (gnu_builtin_decl)
4240 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4242 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4244 gnu_decl = gnu_builtin_decl;
4245 gnu_type = gnu_builtin_type;
4250 /* If there was no specified Interface_Name and the external and
4251 internal names of the subprogram are the same, only use the
4252 internal name to allow disambiguation of nested subprograms. */
4253 if (No (Interface_Name (gnat_entity))
4254 && gnu_ext_name == gnu_entity_name)
4255 gnu_ext_name = NULL_TREE;
4257 /* If we are defining the subprogram and it has an Address clause
4258 we must get the address expression from the saved GCC tree for the
4259 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4260 the address expression here since the front-end has guaranteed
4261 in that case that the elaboration has no effects. If there is
4262 an Address clause and we are not defining the object, just
4263 make it a constant. */
4264 if (Present (Address_Clause (gnat_entity)))
4266 tree gnu_address = NULL_TREE;
4270 = (present_gnu_tree (gnat_entity)
4271 ? get_gnu_tree (gnat_entity)
4272 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4274 save_gnu_tree (gnat_entity, NULL_TREE, false);
4276 /* Convert the type of the object to a reference type that can
4277 alias everything as per 13.3(19). */
4279 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4281 gnu_address = convert (gnu_type, gnu_address);
4284 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4285 gnu_address, false, Is_Public (gnat_entity),
4286 extern_flag, false, NULL, gnat_entity);
4287 DECL_BY_REF_P (gnu_decl) = 1;
4290 else if (kind == E_Subprogram_Type)
4291 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4292 !Comes_From_Source (gnat_entity),
4293 debug_info_p, gnat_entity);
4298 gnu_stub_name = gnu_ext_name;
4299 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4300 public_flag = false;
4303 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4304 gnu_type, gnu_param_list,
4305 inline_flag, public_flag,
4306 extern_flag, attr_list,
4311 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4312 gnu_stub_type, gnu_stub_param_list,
4314 extern_flag, attr_list,
4316 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4319 /* This is unrelated to the stub built right above. */
4320 DECL_STUBBED_P (gnu_decl)
4321 = Convention (gnat_entity) == Convention_Stubbed;
4326 case E_Incomplete_Type:
4327 case E_Incomplete_Subtype:
4328 case E_Private_Type:
4329 case E_Private_Subtype:
4330 case E_Limited_Private_Type:
4331 case E_Limited_Private_Subtype:
4332 case E_Record_Type_With_Private:
4333 case E_Record_Subtype_With_Private:
4335 /* Get the "full view" of this entity. If this is an incomplete
4336 entity from a limited with, treat its non-limited view as the
4337 full view. Otherwise, use either the full view or the underlying
4338 full view, whichever is present. This is used in all the tests
4341 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4342 && From_With_Type (gnat_entity))
4343 ? Non_Limited_View (gnat_entity)
4344 : Present (Full_View (gnat_entity))
4345 ? Full_View (gnat_entity)
4346 : Underlying_Full_View (gnat_entity);
4348 /* If this is an incomplete type with no full view, it must be a Taft
4349 Amendment type, in which case we return a dummy type. Otherwise,
4350 just get the type from its Etype. */
4353 if (kind == E_Incomplete_Type)
4355 gnu_type = make_dummy_type (gnat_entity);
4356 gnu_decl = TYPE_STUB_DECL (gnu_type);
4360 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4362 maybe_present = true;
4367 /* If we already made a type for the full view, reuse it. */
4368 else if (present_gnu_tree (full_view))
4370 gnu_decl = get_gnu_tree (full_view);
4374 /* Otherwise, if we are not defining the type now, get the type
4375 from the full view. But always get the type from the full view
4376 for define on use types, since otherwise we won't see them! */
4377 else if (!definition
4378 || (Is_Itype (full_view)
4379 && No (Freeze_Node (gnat_entity)))
4380 || (Is_Itype (gnat_entity)
4381 && No (Freeze_Node (full_view))))
4383 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4384 maybe_present = true;
4388 /* For incomplete types, make a dummy type entry which will be
4389 replaced later. Save it as the full declaration's type so
4390 we can do any needed updates when we see it. */
4391 gnu_type = make_dummy_type (gnat_entity);
4392 gnu_decl = TYPE_STUB_DECL (gnu_type);
4393 save_gnu_tree (full_view, gnu_decl, 0);
4397 /* Simple class_wide types are always viewed as their root_type
4398 by Gigi unless an Equivalent_Type is specified. */
4399 case E_Class_Wide_Type:
4400 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4401 maybe_present = true;
4405 case E_Task_Subtype:
4406 case E_Protected_Type:
4407 case E_Protected_Subtype:
4408 if (type_annotate_only && No (gnat_equiv_type))
4409 gnu_type = void_type_node;
4411 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4413 maybe_present = true;
4417 gnu_decl = create_label_decl (gnu_entity_name);
4422 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4423 we've already saved it, so we don't try to. */
4424 gnu_decl = error_mark_node;
4432 /* If we had a case where we evaluated another type and it might have
4433 defined this one, handle it here. */
4434 if (maybe_present && present_gnu_tree (gnat_entity))
4436 gnu_decl = get_gnu_tree (gnat_entity);
4440 /* If we are processing a type and there is either no decl for it or
4441 we just made one, do some common processing for the type, such as
4442 handling alignment and possible padding. */
4443 if (is_type && (!gnu_decl || this_made_decl))
4445 if (Is_Tagged_Type (gnat_entity)
4446 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4447 TYPE_ALIGN_OK (gnu_type) = 1;
4449 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4450 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4452 /* ??? Don't set the size for a String_Literal since it is either
4453 confirming or we don't handle it properly (if the low bound is
4455 if (!gnu_size && kind != E_String_Literal_Subtype)
4456 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4458 Has_Size_Clause (gnat_entity));
4460 /* If a size was specified, see if we can make a new type of that size
4461 by rearranging the type, for example from a fat to a thin pointer. */
4465 = make_type_from_size (gnu_type, gnu_size,
4466 Has_Biased_Representation (gnat_entity));
4468 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4469 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4473 /* If the alignment hasn't already been processed and this is
4474 not an unconstrained array, see if an alignment is specified.
4475 If not, we pick a default alignment for atomic objects. */
4476 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4478 else if (Known_Alignment (gnat_entity))
4480 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4481 TYPE_ALIGN (gnu_type));
4483 /* Warn on suspiciously large alignments. This should catch
4484 errors about the (alignment,byte)/(size,bit) discrepancy. */
4485 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4489 /* If a size was specified, take it into account. Otherwise
4490 use the RM size for records as the type size has already
4491 been adjusted to the alignment. */
4494 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4495 || TREE_CODE (gnu_type) == UNION_TYPE
4496 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4497 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4498 size = rm_size (gnu_type);
4500 size = TYPE_SIZE (gnu_type);
4502 /* Consider an alignment as suspicious if the alignment/size
4503 ratio is greater or equal to the byte/bit ratio. */
4504 if (host_integerp (size, 1)
4505 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4506 post_error_ne ("?suspiciously large alignment specified for&",
4507 Expression (Alignment_Clause (gnat_entity)),
4511 else if (Is_Atomic (gnat_entity) && !gnu_size
4512 && host_integerp (TYPE_SIZE (gnu_type), 1)
4513 && integer_pow2p (TYPE_SIZE (gnu_type)))
4514 align = MIN (BIGGEST_ALIGNMENT,
4515 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4516 else if (Is_Atomic (gnat_entity) && gnu_size
4517 && host_integerp (gnu_size, 1)
4518 && integer_pow2p (gnu_size))
4519 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4521 /* See if we need to pad the type. If we did, and made a record,
4522 the name of the new type may be changed. So get it back for
4523 us when we make the new TYPE_DECL below. */
4524 if (gnu_size || align > 0)
4525 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4526 "PAD", true, definition, false);
4528 if (TREE_CODE (gnu_type) == RECORD_TYPE
4529 && TYPE_IS_PADDING_P (gnu_type))
4531 gnu_entity_name = TYPE_NAME (gnu_type);
4532 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4533 gnu_entity_name = DECL_NAME (gnu_entity_name);
4536 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4538 /* If we are at global level, GCC will have applied variable_size to
4539 the type, but that won't have done anything. So, if it's not
4540 a constant or self-referential, call elaborate_expression_1 to
4541 make a variable for the size rather than calculating it each time.
4542 Handle both the RM size and the actual size. */
4543 if (global_bindings_p ()
4544 && TYPE_SIZE (gnu_type)
4545 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4546 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4548 if (TREE_CODE (gnu_type) == RECORD_TYPE
4549 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4550 TYPE_SIZE (gnu_type), 0))
4552 TYPE_SIZE (gnu_type)
4553 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4554 gnat_entity, get_identifier ("SIZE"),
4556 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4560 TYPE_SIZE (gnu_type)
4561 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4562 gnat_entity, get_identifier ("SIZE"),
4565 /* ??? For now, store the size as a multiple of the alignment
4566 in bytes so that we can see the alignment from the tree. */
4567 TYPE_SIZE_UNIT (gnu_type)
4569 (MULT_EXPR, sizetype,
4570 elaborate_expression_1
4571 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4572 TYPE_SIZE_UNIT (gnu_type),
4573 size_int (TYPE_ALIGN (gnu_type)
4575 gnat_entity, get_identifier ("SIZE_A_UNIT"),
4577 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4579 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4582 elaborate_expression_1 (TYPE_ADA_SIZE (gnu_type),
4584 get_identifier ("RM_SIZE"),
4585 definition, false));
4589 /* If this is a record type or subtype, call elaborate_expression_1 on
4590 any field position. Do this for both global and local types.
4591 Skip any fields that we haven't made trees for to avoid problems with
4592 class wide types. */
4593 if (IN (kind, Record_Kind))
4594 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4595 gnat_temp = Next_Entity (gnat_temp))
4596 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4598 tree gnu_field = get_gnu_tree (gnat_temp);
4600 /* ??? Unfortunately, GCC needs to be able to prove the
4601 alignment of this offset and if it's a variable, it can't.
4602 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4603 right now, we have to put in an explicit multiply and
4604 divide by that value. */
4605 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4607 DECL_FIELD_OFFSET (gnu_field)
4609 (MULT_EXPR, sizetype,
4610 elaborate_expression_1
4611 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4612 DECL_FIELD_OFFSET (gnu_field),
4613 size_int (DECL_OFFSET_ALIGN (gnu_field)
4615 gnat_temp, get_identifier ("OFFSET"),
4617 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4619 /* ??? The context of gnu_field is not necessarily gnu_type so
4620 the MULT_EXPR node built above may not be marked by the call
4621 to create_type_decl below. */
4622 if (global_bindings_p ())
4623 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4627 gnu_type = build_qualified_type (gnu_type,
4628 (TYPE_QUALS (gnu_type)
4629 | (TYPE_QUAL_VOLATILE
4630 * Treat_As_Volatile (gnat_entity))));
4632 if (Is_Atomic (gnat_entity))
4633 check_ok_for_atomic (gnu_type, gnat_entity, false);
4635 if (Present (Alignment_Clause (gnat_entity)))
4636 TYPE_USER_ALIGN (gnu_type) = 1;
4638 if (Universal_Aliasing (gnat_entity))
4639 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4642 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4643 !Comes_From_Source (gnat_entity),
4644 debug_info_p, gnat_entity);
4646 TREE_TYPE (gnu_decl) = gnu_type;
4649 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4651 gnu_type = TREE_TYPE (gnu_decl);
4653 /* If this is a derived type, relate its alias set to that of its parent
4654 to avoid troubles when a call to an inherited primitive is inlined in
4655 a context where a derived object is accessed. The inlined code works
4656 on the parent view so the resulting code may access the same object
4657 using both the parent and the derived alias sets, which thus have to
4658 conflict. As the same issue arises with component references, the
4659 parent alias set also has to conflict with composite types enclosing
4660 derived components. For instance, if we have:
4667 we want T to conflict with both D and R, in addition to R being a
4668 superset of D by record/component construction.
4670 One way to achieve this is to perform an alias set copy from the
4671 parent to the derived type. This is not quite appropriate, though,
4672 as we don't want separate derived types to conflict with each other:
4674 type I1 is new Integer;
4675 type I2 is new Integer;
4677 We want I1 and I2 to both conflict with Integer but we do not want
4678 I1 to conflict with I2, and an alias set copy on derivation would
4681 The option chosen is to make the alias set of the derived type a
4682 superset of that of its parent type. It trivially fulfills the
4683 simple requirement for the Integer derivation example above, and
4684 the component case as well by superset transitivity:
4687 R ----------> D ----------> T
4689 The language rules ensure the parent type is already frozen here. */
4690 if (Is_Derived_Type (gnat_entity))
4692 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4693 relate_alias_sets (gnu_type, gnu_parent_type, ALIAS_SET_SUPERSET);
4696 /* Back-annotate the Alignment of the type if not already in the
4697 tree. Likewise for sizes. */
4698 if (Unknown_Alignment (gnat_entity))
4700 unsigned int double_align, align;
4701 bool is_capped_double, align_clause;
4703 /* If the default alignment of "double" or larger scalar types is
4704 specifically capped and this is not an array with an alignment
4705 clause on the component type, return the cap. */
4706 if ((double_align = double_float_alignment) > 0)
4708 = is_double_float_or_array (gnat_entity, &align_clause);
4709 else if ((double_align = double_scalar_alignment) > 0)
4711 = is_double_scalar_or_array (gnat_entity, &align_clause);
4713 is_capped_double = align_clause = false;
4715 if (is_capped_double && !align_clause)
4716 align = double_align;
4718 align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
4720 Set_Alignment (gnat_entity, UI_From_Int (align));
4723 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4725 /* If the size is self-referential, we annotate the maximum
4726 value of that size. */
4727 tree gnu_size = TYPE_SIZE (gnu_type);
4729 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4730 gnu_size = max_size (gnu_size, true);
4732 Set_Esize (gnat_entity, annotate_value (gnu_size));
4734 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4736 /* In this mode the tag and the parent components are not
4737 generated by the front-end, so the sizes must be adjusted
4739 int size_offset, new_size;
4741 if (Is_Derived_Type (gnat_entity))
4744 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4745 Set_Alignment (gnat_entity,
4746 Alignment (Etype (Base_Type (gnat_entity))));
4749 size_offset = POINTER_SIZE;
4751 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4752 Set_Esize (gnat_entity,
4753 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4754 / POINTER_SIZE) * POINTER_SIZE));
4755 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4759 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4760 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4763 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4764 DECL_ARTIFICIAL (gnu_decl) = 1;
4766 if (!debug_info_p && DECL_P (gnu_decl)
4767 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4768 && No (Renamed_Object (gnat_entity)))
4769 DECL_IGNORED_P (gnu_decl) = 1;
4771 /* If we haven't already, associate the ..._DECL node that we just made with
4772 the input GNAT entity node. */
4774 save_gnu_tree (gnat_entity, gnu_decl, false);
4776 /* If this is an enumeration or floating-point type, we were not able to set
4777 the bounds since they refer to the type. These are always static. */
4778 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4779 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4781 tree gnu_scalar_type = gnu_type;
4782 tree gnu_low_bound, gnu_high_bound;
4784 /* If this is a padded type, we need to use the underlying type. */
4785 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4786 && TYPE_IS_PADDING_P (gnu_scalar_type))
4787 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4789 /* If this is a floating point type and we haven't set a floating
4790 point type yet, use this in the evaluation of the bounds. */
4791 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4792 longest_float_type_node = gnu_scalar_type;
4794 gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4795 gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity));
4797 if (kind == E_Enumeration_Type)
4799 /* Enumeration types have specific RM bounds. */
4800 SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound);
4801 SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound);
4803 /* Write full debugging information. Since this has both a
4804 typedef and a tag, avoid outputting the name twice. */
4805 DECL_ARTIFICIAL (gnu_decl) = 1;
4806 rest_of_type_decl_compilation (gnu_decl);
4811 /* Floating-point types don't have specific RM bounds. */
4812 TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound;
4813 TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound;
4817 /* If we deferred processing of incomplete types, re-enable it. If there
4818 were no other disables and we have some to process, do so. */
4819 if (this_deferred && --defer_incomplete_level == 0)
4821 if (defer_incomplete_list)
4823 struct incomplete *incp, *next;
4825 /* We are back to level 0 for the deferring of incomplete types.
4826 But processing these incomplete types below may itself require
4827 deferring, so preserve what we have and restart from scratch. */
4828 incp = defer_incomplete_list;
4829 defer_incomplete_list = NULL;
4831 /* For finalization, however, all types must be complete so we
4832 cannot do the same because deferred incomplete types may end up
4833 referencing each other. Process them all recursively first. */
4834 defer_finalize_level++;
4836 for (; incp; incp = next)
4841 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4842 gnat_to_gnu_type (incp->full_type));
4846 defer_finalize_level--;
4849 /* All the deferred incomplete types have been processed so we can
4850 now proceed with the finalization of the deferred types. */
4851 if (defer_finalize_level == 0 && defer_finalize_list)
4856 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4857 rest_of_type_decl_compilation_no_defer (t);
4859 VEC_free (tree, heap, defer_finalize_list);
4863 /* If we are not defining this type, see if it's in the incomplete list.
4864 If so, handle that list entry now. */
4865 else if (!definition)
4867 struct incomplete *incp;
4869 for (incp = defer_incomplete_list; incp; incp = incp->next)
4870 if (incp->old_type && incp->full_type == gnat_entity)
4872 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4873 TREE_TYPE (gnu_decl));
4874 incp->old_type = NULL_TREE;
4881 /* If this is a packed array type whose original array type is itself
4882 an Itype without freeze node, make sure the latter is processed. */
4883 if (Is_Packed_Array_Type (gnat_entity)
4884 && Is_Itype (Original_Array_Type (gnat_entity))
4885 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4886 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4887 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4892 /* Similar, but if the returned value is a COMPONENT_REF, return the
4896 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4898 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4900 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4901 gnu_field = TREE_OPERAND (gnu_field, 1);
4906 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4907 the GCC type corresponding to that entity. */
4910 gnat_to_gnu_type (Entity_Id gnat_entity)
4914 /* The back end never attempts to annotate generic types. */
4915 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4916 return void_type_node;
4918 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4919 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4921 return TREE_TYPE (gnu_decl);
4924 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4925 the unpadded version of the GCC type corresponding to that entity. */
4928 get_unpadded_type (Entity_Id gnat_entity)
4930 tree type = gnat_to_gnu_type (gnat_entity);
4932 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4933 type = TREE_TYPE (TYPE_FIELDS (type));
4938 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4939 Every TYPE_DECL generated for a type definition must be passed
4940 to this function once everything else has been done for it. */
4943 rest_of_type_decl_compilation (tree decl)
4945 /* We need to defer finalizing the type if incomplete types
4946 are being deferred or if they are being processed. */
4947 if (defer_incomplete_level || defer_finalize_level)
4948 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4950 rest_of_type_decl_compilation_no_defer (decl);
4953 /* Same as above but without deferring the compilation. This
4954 function should not be invoked directly on a TYPE_DECL. */
4957 rest_of_type_decl_compilation_no_defer (tree decl)
4959 const int toplev = global_bindings_p ();
4960 tree t = TREE_TYPE (decl);
4962 rest_of_decl_compilation (decl, toplev, 0);
4964 /* Now process all the variants. This is needed for STABS. */
4965 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4967 if (t == TREE_TYPE (decl))
4970 if (!TYPE_STUB_DECL (t))
4971 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4973 rest_of_type_compilation (t, toplev);
4977 /* Finalize any From_With_Type incomplete types. We do this after processing
4978 our compilation unit and after processing its spec, if this is a body. */
4981 finalize_from_with_types (void)
4983 struct incomplete *incp = defer_limited_with;
4984 struct incomplete *next;
4986 defer_limited_with = 0;
4987 for (; incp; incp = next)
4991 if (incp->old_type != 0)
4992 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4993 gnat_to_gnu_type (incp->full_type));
4998 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4999 kind of type (such E_Task_Type) that has a different type which Gigi
5000 uses for its representation. If the type does not have a special type
5001 for its representation, return GNAT_ENTITY. If a type is supposed to
5002 exist, but does not, abort unless annotating types, in which case
5003 return Empty. If GNAT_ENTITY is Empty, return Empty. */
5006 Gigi_Equivalent_Type (Entity_Id gnat_entity)
5008 Entity_Id gnat_equiv = gnat_entity;
5010 if (No (gnat_entity))
5013 switch (Ekind (gnat_entity))
5015 case E_Class_Wide_Subtype:
5016 if (Present (Equivalent_Type (gnat_entity)))
5017 gnat_equiv = Equivalent_Type (gnat_entity);
5020 case E_Access_Protected_Subprogram_Type:
5021 case E_Anonymous_Access_Protected_Subprogram_Type:
5022 gnat_equiv = Equivalent_Type (gnat_entity);
5025 case E_Class_Wide_Type:
5026 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
5027 ? Equivalent_Type (gnat_entity)
5028 : Root_Type (gnat_entity));
5032 case E_Task_Subtype:
5033 case E_Protected_Type:
5034 case E_Protected_Subtype:
5035 gnat_equiv = Corresponding_Record_Type (gnat_entity);
5042 gcc_assert (Present (gnat_equiv) || type_annotate_only);
5046 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
5047 using MECH as its passing mechanism, to be placed in the parameter
5048 list built for GNAT_SUBPROG. Assume a foreign convention for the
5049 latter if FOREIGN is true. Also set CICO to true if the parameter
5050 must use the copy-in copy-out implementation mechanism.
5052 The returned tree is a PARM_DECL, except for those cases where no
5053 parameter needs to be actually passed to the subprogram; the type
5054 of this "shadow" parameter is then returned instead. */
5057 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
5058 Entity_Id gnat_subprog, bool foreign, bool *cico)
5060 tree gnu_param_name = get_entity_name (gnat_param);
5061 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
5062 tree gnu_param_type_alt = NULL_TREE;
5063 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
5064 /* The parameter can be indirectly modified if its address is taken. */
5065 bool ro_param = in_param && !Address_Taken (gnat_param);
5066 bool by_return = false, by_component_ptr = false, by_ref = false;
5069 /* Copy-return is used only for the first parameter of a valued procedure.
5070 It's a copy mechanism for which a parameter is never allocated. */
5071 if (mech == By_Copy_Return)
5073 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5078 /* If this is either a foreign function or if the underlying type won't
5079 be passed by reference, strip off possible padding type. */
5080 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
5081 && TYPE_IS_PADDING_P (gnu_param_type))
5083 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5085 if (mech == By_Reference
5087 || (!must_pass_by_ref (unpadded_type)
5088 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5089 gnu_param_type = unpadded_type;
5092 /* If this is a read-only parameter, make a variant of the type that is
5093 read-only. ??? However, if this is an unconstrained array, that type
5094 can be very complex, so skip it for now. Likewise for any other
5095 self-referential type. */
5097 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5098 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5099 gnu_param_type = build_qualified_type (gnu_param_type,
5100 (TYPE_QUALS (gnu_param_type)
5101 | TYPE_QUAL_CONST));
5103 /* For foreign conventions, pass arrays as pointers to the element type.
5104 First check for unconstrained array and get the underlying array. */
5105 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5107 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5109 /* VMS descriptors are themselves passed by reference. */
5110 if (mech == By_Short_Descriptor ||
5111 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5113 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5114 Mechanism (gnat_param),
5116 else if (mech == By_Descriptor)
5118 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5119 chosen in fill_vms_descriptor. */
5121 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5122 Mechanism (gnat_param),
5125 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5126 Mechanism (gnat_param),
5130 /* Arrays are passed as pointers to element type for foreign conventions. */
5133 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5135 /* Strip off any multi-dimensional entries, then strip
5136 off the last array to get the component type. */
5137 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5138 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5139 gnu_param_type = TREE_TYPE (gnu_param_type);
5141 by_component_ptr = true;
5142 gnu_param_type = TREE_TYPE (gnu_param_type);
5145 gnu_param_type = build_qualified_type (gnu_param_type,
5146 (TYPE_QUALS (gnu_param_type)
5147 | TYPE_QUAL_CONST));
5149 gnu_param_type = build_pointer_type (gnu_param_type);
5152 /* Fat pointers are passed as thin pointers for foreign conventions. */
5153 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
5155 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5157 /* If we must pass or were requested to pass by reference, do so.
5158 If we were requested to pass by copy, do so.
5159 Otherwise, for foreign conventions, pass In Out or Out parameters
5160 or aggregates by reference. For COBOL and Fortran, pass all
5161 integer and FP types that way too. For Convention Ada, use
5162 the standard Ada default. */
5163 else if (must_pass_by_ref (gnu_param_type)
5164 || mech == By_Reference
5167 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5169 && (Convention (gnat_subprog) == Convention_Fortran
5170 || Convention (gnat_subprog) == Convention_COBOL)
5171 && (INTEGRAL_TYPE_P (gnu_param_type)
5172 || FLOAT_TYPE_P (gnu_param_type)))
5174 && default_pass_by_ref (gnu_param_type)))))
5176 gnu_param_type = build_reference_type (gnu_param_type);
5180 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5184 if (mech == By_Copy && (by_ref || by_component_ptr))
5185 post_error ("?cannot pass & by copy", gnat_param);
5187 /* If this is an Out parameter that isn't passed by reference and isn't
5188 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5189 it will be a VAR_DECL created when we process the procedure, so just
5190 return its type. For the special parameter of a valued procedure,
5193 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5194 Out parameters with discriminants or implicit initial values to be
5195 handled like In Out parameters. These type are normally built as
5196 aggregates, hence passed by reference, except for some packed arrays
5197 which end up encoded in special integer types.
5199 The exception we need to make is then for packed arrays of records
5200 with discriminants or implicit initial values. We have no light/easy
5201 way to check for the latter case, so we merely check for packed arrays
5202 of records. This may lead to useless copy-in operations, but in very
5203 rare cases only, as these would be exceptions in a set of already
5204 exceptional situations. */
5205 if (Ekind (gnat_param) == E_Out_Parameter
5208 || (mech != By_Descriptor
5209 && mech != By_Short_Descriptor
5210 && !POINTER_TYPE_P (gnu_param_type)
5211 && !AGGREGATE_TYPE_P (gnu_param_type)))
5212 && !(Is_Array_Type (Etype (gnat_param))
5213 && Is_Packed (Etype (gnat_param))
5214 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5215 return gnu_param_type;
5217 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5218 ro_param || by_ref || by_component_ptr);
5219 DECL_BY_REF_P (gnu_param) = by_ref;
5220 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5221 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5222 mech == By_Short_Descriptor);
5223 DECL_POINTS_TO_READONLY_P (gnu_param)
5224 = (ro_param && (by_ref || by_component_ptr));
5226 /* Save the alternate descriptor type, if any. */
5227 if (gnu_param_type_alt)
5228 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5230 /* If no Mechanism was specified, indicate what we're using, then
5231 back-annotate it. */
5232 if (mech == Default)
5233 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5235 Set_Mechanism (gnat_param, mech);
5239 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5242 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5244 while (Present (Corresponding_Discriminant (discr1)))
5245 discr1 = Corresponding_Discriminant (discr1);
5247 while (Present (Corresponding_Discriminant (discr2)))
5248 discr2 = Corresponding_Discriminant (discr2);
5251 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5254 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
5255 a non-aliased component in the back-end sense. */
5258 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
5260 /* If the type below this is a multi-array type, then
5261 this does not have aliased components. */
5262 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5263 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5266 if (Has_Aliased_Components (gnat_type))
5269 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5272 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5275 compile_time_known_address_p (Node_Id gnat_address)
5277 /* Catch System'To_Address. */
5278 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5279 gnat_address = Expression (gnat_address);
5281 return Compile_Time_Known_Value (gnat_address);
5284 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5285 be elaborated at the point of its definition, but do nothing else. */
5288 elaborate_entity (Entity_Id gnat_entity)
5290 switch (Ekind (gnat_entity))
5292 case E_Signed_Integer_Subtype:
5293 case E_Modular_Integer_Subtype:
5294 case E_Enumeration_Subtype:
5295 case E_Ordinary_Fixed_Point_Subtype:
5296 case E_Decimal_Fixed_Point_Subtype:
5297 case E_Floating_Point_Subtype:
5299 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5300 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5302 /* ??? Tests to avoid Constraint_Error in static expressions
5303 are needed until after the front stops generating bogus
5304 conversions on bounds of real types. */
5305 if (!Raises_Constraint_Error (gnat_lb))
5306 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5307 true, false, Needs_Debug_Info (gnat_entity));
5308 if (!Raises_Constraint_Error (gnat_hb))
5309 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5310 true, false, Needs_Debug_Info (gnat_entity));
5316 Node_Id full_definition = Declaration_Node (gnat_entity);
5317 Node_Id record_definition = Type_Definition (full_definition);
5319 /* If this is a record extension, go a level further to find the
5320 record definition. */
5321 if (Nkind (record_definition) == N_Derived_Type_Definition)
5322 record_definition = Record_Extension_Part (record_definition);
5326 case E_Record_Subtype:
5327 case E_Private_Subtype:
5328 case E_Limited_Private_Subtype:
5329 case E_Record_Subtype_With_Private:
5330 if (Is_Constrained (gnat_entity)
5331 && Has_Discriminants (gnat_entity)
5332 && Present (Discriminant_Constraint (gnat_entity)))
5334 Node_Id gnat_discriminant_expr;
5335 Entity_Id gnat_field;
5338 = First_Discriminant (Implementation_Base_Type (gnat_entity)),
5339 gnat_discriminant_expr
5340 = First_Elmt (Discriminant_Constraint (gnat_entity));
5341 Present (gnat_field);
5342 gnat_field = Next_Discriminant (gnat_field),
5343 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5344 /* ??? For now, ignore access discriminants. */
5345 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5346 elaborate_expression (Node (gnat_discriminant_expr),
5347 gnat_entity, get_entity_name (gnat_field),
5348 true, false, false);
5355 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5356 any entities on its entity chain similarly. */
5359 mark_out_of_scope (Entity_Id gnat_entity)
5361 Entity_Id gnat_sub_entity;
5362 unsigned int kind = Ekind (gnat_entity);
5364 /* If this has an entity list, process all in the list. */
5365 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5366 || IN (kind, Private_Kind)
5367 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5368 || kind == E_Function || kind == E_Generic_Function
5369 || kind == E_Generic_Package || kind == E_Generic_Procedure
5370 || kind == E_Loop || kind == E_Operator || kind == E_Package
5371 || kind == E_Package_Body || kind == E_Procedure
5372 || kind == E_Record_Type || kind == E_Record_Subtype
5373 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5374 for (gnat_sub_entity = First_Entity (gnat_entity);
5375 Present (gnat_sub_entity);
5376 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5377 if (Scope (gnat_sub_entity) == gnat_entity
5378 && gnat_sub_entity != gnat_entity)
5379 mark_out_of_scope (gnat_sub_entity);
5381 /* Now clear this if it has been defined, but only do so if it isn't
5382 a subprogram or parameter. We could refine this, but it isn't
5383 worth it. If this is statically allocated, it is supposed to
5384 hang around out of cope. */
5385 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5386 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5388 save_gnu_tree (gnat_entity, NULL_TREE, true);
5389 save_gnu_tree (gnat_entity, error_mark_node, true);
5393 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5394 If this is a multi-dimensional array type, do this recursively.
5397 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5398 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5399 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5402 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5404 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5405 of a one-dimensional array, since the padding has the same alias set
5406 as the field type, but if it's a multi-dimensional array, we need to
5407 see the inner types. */
5408 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5409 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5410 || TYPE_IS_PADDING_P (gnu_old_type)))
5411 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5413 /* Unconstrained array types are deemed incomplete and would thus be given
5414 alias set 0. Retrieve the underlying array type. */
5415 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5417 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5418 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5420 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5422 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5423 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5424 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5425 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5429 case ALIAS_SET_COPY:
5430 /* The alias set shouldn't be copied between array types with different
5431 aliasing settings because this can break the aliasing relationship
5432 between the array type and its element type. */
5433 #ifndef ENABLE_CHECKING
5434 if (flag_strict_aliasing)
5436 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5437 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5438 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5439 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5441 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5444 case ALIAS_SET_SUBSET:
5445 case ALIAS_SET_SUPERSET:
5447 alias_set_type old_set = get_alias_set (gnu_old_type);
5448 alias_set_type new_set = get_alias_set (gnu_new_type);
5450 /* Do nothing if the alias sets conflict. This ensures that we
5451 never call record_alias_subset several times for the same pair
5452 or at all for alias set 0. */
5453 if (!alias_sets_conflict_p (old_set, new_set))
5455 if (op == ALIAS_SET_SUBSET)
5456 record_alias_subset (old_set, new_set);
5458 record_alias_subset (new_set, old_set);
5467 record_component_aliases (gnu_new_type);
5470 /* Return a TREE_LIST describing the substitutions needed to reflect the
5471 discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can
5472 be in any order. TREE_PURPOSE gives the tree for the discriminant and
5473 TREE_VALUE is the replacement value. They are in the form of operands
5474 to substitute_in_expr. DEFINITION is true if this is for a definition
5478 build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition)
5480 tree gnu_list = NULL_TREE;
5481 Entity_Id gnat_discrim;
5484 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5485 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5486 Present (gnat_discrim);
5487 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5488 gnat_value = Next_Elmt (gnat_value))
5489 /* Ignore access discriminants. */
5490 if (!Is_Access_Type (Etype (Node (gnat_value))))
5491 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5492 elaborate_expression
5493 (Node (gnat_value), gnat_subtype,
5494 get_entity_name (gnat_discrim), definition,
5501 /* Return true if the size represented by GNU_SIZE can be handled by an
5502 allocation. If STATIC_P is true, consider only what can be done with a
5503 static allocation. */
5506 allocatable_size_p (tree gnu_size, bool static_p)
5508 HOST_WIDE_INT our_size;
5510 /* If this is not a static allocation, the only case we want to forbid
5511 is an overflowing size. That will be converted into a raise a
5514 return !(TREE_CODE (gnu_size) == INTEGER_CST
5515 && TREE_OVERFLOW (gnu_size));
5517 /* Otherwise, we need to deal with both variable sizes and constant
5518 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5519 since assemblers may not like very large sizes. */
5520 if (!host_integerp (gnu_size, 1))
5523 our_size = tree_low_cst (gnu_size, 1);
5524 return (int) our_size == our_size;
5527 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5528 NAME, ARGS and ERROR_POINT. */
5531 prepend_one_attribute_to (struct attrib ** attr_list,
5532 enum attr_type attr_type,
5535 Node_Id attr_error_point)
5537 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5539 attr->type = attr_type;
5540 attr->name = attr_name;
5541 attr->args = attr_args;
5542 attr->error_point = attr_error_point;
5544 attr->next = *attr_list;
5548 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5551 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5555 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5556 gnat_temp = Next_Rep_Item (gnat_temp))
5557 if (Nkind (gnat_temp) == N_Pragma)
5559 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5560 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5561 enum attr_type etype;
5563 if (Present (gnat_assoc) && Present (First (gnat_assoc))
5564 && Present (Next (First (gnat_assoc)))
5565 && (Nkind (Expression (Next (First (gnat_assoc))))
5566 == N_String_Literal))
5568 gnu_arg0 = get_identifier (TREE_STRING_POINTER
5571 (First (gnat_assoc))))));
5572 if (Present (Next (Next (First (gnat_assoc))))
5573 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
5574 == N_String_Literal))
5575 gnu_arg1 = get_identifier (TREE_STRING_POINTER
5579 (First (gnat_assoc)))))));
5582 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5584 case Pragma_Machine_Attribute:
5585 etype = ATTR_MACHINE_ATTRIBUTE;
5588 case Pragma_Linker_Alias:
5589 etype = ATTR_LINK_ALIAS;
5592 case Pragma_Linker_Section:
5593 etype = ATTR_LINK_SECTION;
5596 case Pragma_Linker_Constructor:
5597 etype = ATTR_LINK_CONSTRUCTOR;
5600 case Pragma_Linker_Destructor:
5601 etype = ATTR_LINK_DESTRUCTOR;
5604 case Pragma_Weak_External:
5605 etype = ATTR_WEAK_EXTERNAL;
5608 case Pragma_Thread_Local_Storage:
5609 etype = ATTR_THREAD_LOCAL_STORAGE;
5617 /* Prepend to the list now. Make a list of the argument we might
5618 have, as GCC expects it. */
5619 prepend_one_attribute_to
5622 (gnu_arg1 != NULL_TREE)
5623 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5624 Present (Next (First (gnat_assoc)))
5625 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5629 /* Called when we need to protect a variable object using a SAVE_EXPR. */
5632 maybe_variable (tree gnu_operand)
5634 if (TREE_CONSTANT (gnu_operand)
5635 || TREE_READONLY (gnu_operand)
5636 || TREE_CODE (gnu_operand) == SAVE_EXPR
5637 || TREE_CODE (gnu_operand) == NULL_EXPR)
5640 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5643 = build1 (UNCONSTRAINED_ARRAY_REF, TREE_TYPE (gnu_operand),
5644 variable_size (TREE_OPERAND (gnu_operand, 0)));
5646 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5647 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5651 return variable_size (gnu_operand);
5654 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5655 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5656 return the GCC tree to use for that expression. GNU_NAME is the suffix
5657 to use if a variable needs to be created and DEFINITION is true if this
5658 is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result;
5659 otherwise, we are just elaborating the expression for side-effects. If
5660 NEED_DEBUG is true, we need a variable for debugging purposes even if it
5661 isn't needed for code generation. */
5664 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name,
5665 bool definition, bool need_value, bool need_debug)
5669 /* If we already elaborated this expression (e.g. it was involved
5670 in the definition of a private type), use the old value. */
5671 if (present_gnu_tree (gnat_expr))
5672 return get_gnu_tree (gnat_expr);
5674 /* If we don't need a value and this is static or a discriminant,
5675 we don't need to do anything. */
5677 && (Is_OK_Static_Expression (gnat_expr)
5678 || (Nkind (gnat_expr) == N_Identifier
5679 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5682 /* If it's a static expression, we don't need a variable for debugging. */
5683 if (need_debug && Is_OK_Static_Expression (gnat_expr))
5686 /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */
5687 gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity,
5688 gnu_name, definition, need_debug);
5690 /* Save the expression in case we try to elaborate this entity again. Since
5691 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5692 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5693 save_gnu_tree (gnat_expr, gnu_expr, true);
5695 return need_value ? gnu_expr : error_mark_node;
5698 /* Similar, but take a GNU expression and always return a result. */
5701 elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
5702 bool definition, bool need_debug)
5704 /* Skip any conversions and simple arithmetics to see if the expression
5705 is a read-only variable.
5706 ??? This really should remain read-only, but we have to think about
5707 the typing of the tree here. */
5709 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5710 tree gnu_decl = NULL_TREE;
5711 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5714 /* In most cases, we won't see a naked FIELD_DECL because a discriminant
5715 reference will have been replaced with a COMPONENT_REF when the type
5716 is being elaborated. However, there are some cases involving child
5717 types where we will. So convert it to a COMPONENT_REF. We hope it
5718 will be at the highest level of the expression in these cases. */
5719 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5720 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5721 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5722 gnu_expr, NULL_TREE);
5724 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5725 that is read-only, make a variable that is initialized to contain the
5726 bound when the package containing the definition is elaborated. If
5727 this entity is defined at top level and a bound or discriminant value
5728 isn't a constant or a reference to a discriminant, replace the bound
5729 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5730 rely here on the fact that an expression cannot contain both the
5731 discriminant and some other variable. */
5732 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5733 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5734 && (TREE_READONLY (gnu_inner_expr)
5735 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5736 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5738 /* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */
5739 if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr))
5742 /* Now create the variable if we need it. */
5743 if (need_debug || (expr_variable && expr_global))
5745 = create_var_decl (create_concat_name (gnat_entity,
5746 IDENTIFIER_POINTER (gnu_name)),
5747 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5748 !need_debug, Is_Public (gnat_entity),
5749 !definition, false, NULL, gnat_entity);
5751 /* We only need to use this variable if we are in global context since GCC
5752 can do the right thing in the local case. */
5753 if (expr_global && expr_variable)
5756 return expr_variable ? maybe_variable (gnu_expr) : gnu_expr;
5759 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5760 starting bit position so that it is aligned to ALIGN bits, and leaving at
5761 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5762 record is guaranteed to get. */
5765 make_aligning_type (tree type, unsigned int align, tree size,
5766 unsigned int base_align, int room)
5768 /* We will be crafting a record type with one field at a position set to be
5769 the next multiple of ALIGN past record'address + room bytes. We use a
5770 record placeholder to express record'address. */
5772 tree record_type = make_node (RECORD_TYPE);
5773 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5776 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5778 /* The diagram below summarizes the shape of what we manipulate:
5780 <--------- pos ---------->
5781 { +------------+-------------+-----------------+
5782 record =>{ |############| ... | field (type) |
5783 { +------------+-------------+-----------------+
5784 |<-- room -->|<- voffset ->|<---- size ----->|
5787 record_addr vblock_addr
5789 Every length is in sizetype bytes there, except "pos" which has to be
5790 set as a bit position in the GCC tree for the record. */
5792 tree room_st = size_int (room);
5793 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5794 tree voffset_st, pos, field;
5796 tree name = TYPE_NAME (type);
5798 if (TREE_CODE (name) == TYPE_DECL)
5799 name = DECL_NAME (name);
5801 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5803 /* Compute VOFFSET and then POS. The next byte position multiple of some
5804 alignment after some address is obtained by "and"ing the alignment minus
5805 1 with the two's complement of the address. */
5807 voffset_st = size_binop (BIT_AND_EXPR,
5808 size_diffop (size_zero_node, vblock_addr_st),
5809 ssize_int ((align / BITS_PER_UNIT) - 1));
5811 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5813 pos = size_binop (MULT_EXPR,
5814 convert (bitsizetype,
5815 size_binop (PLUS_EXPR, room_st, voffset_st)),
5818 /* Craft the GCC record representation. We exceptionally do everything
5819 manually here because 1) our generic circuitry is not quite ready to
5820 handle the complex position/size expressions we are setting up, 2) we
5821 have a strong simplifying factor at hand: we know the maximum possible
5822 value of voffset, and 3) we have to set/reset at least the sizes in
5823 accordance with this maximum value anyway, as we need them to convey
5824 what should be "alloc"ated for this type.
5826 Use -1 as the 'addressable' indication for the field to prevent the
5827 creation of a bitfield. We don't need one, it would have damaging
5828 consequences on the alignment computation, and create_field_decl would
5829 make one without this special argument, for instance because of the
5830 complex position expression. */
5832 field = create_field_decl (get_identifier ("F"), type, record_type,
5834 TYPE_FIELDS (record_type) = field;
5836 TYPE_ALIGN (record_type) = base_align;
5837 TYPE_USER_ALIGN (record_type) = 1;
5839 TYPE_SIZE (record_type)
5840 = size_binop (PLUS_EXPR,
5841 size_binop (MULT_EXPR, convert (bitsizetype, size),
5843 bitsize_int (align + room * BITS_PER_UNIT));
5844 TYPE_SIZE_UNIT (record_type)
5845 = size_binop (PLUS_EXPR, size,
5846 size_int (room + align / BITS_PER_UNIT));
5848 SET_TYPE_MODE (record_type, BLKmode);
5850 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5854 /* Return the result of rounding T up to ALIGN. */
5856 static inline unsigned HOST_WIDE_INT
5857 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5865 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5866 as the field type of a packed record if IN_RECORD is true, or as the
5867 component type of a packed array if IN_RECORD is false. See if we can
5868 rewrite it either as a type that has a non-BLKmode, which we can pack
5869 tighter in the packed record case, or as a smaller type. If so, return
5870 the new type. If not, return the original type. */
5873 make_packable_type (tree type, bool in_record)
5875 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5876 unsigned HOST_WIDE_INT new_size;
5877 tree new_type, old_field, field_list = NULL_TREE;
5879 /* No point in doing anything if the size is zero. */
5883 new_type = make_node (TREE_CODE (type));
5885 /* Copy the name and flags from the old type to that of the new.
5886 Note that we rely on the pointer equality created here for
5887 TYPE_NAME to look through conversions in various places. */
5888 TYPE_NAME (new_type) = TYPE_NAME (type);
5889 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5890 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5891 if (TREE_CODE (type) == RECORD_TYPE)
5892 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5894 /* If we are in a record and have a small size, set the alignment to
5895 try for an integral mode. Otherwise set it to try for a smaller
5896 type with BLKmode. */
5897 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5899 TYPE_ALIGN (new_type) = ceil_alignment (size);
5900 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5904 unsigned HOST_WIDE_INT align;
5906 /* Do not try to shrink the size if the RM size is not constant. */
5907 if (TYPE_CONTAINS_TEMPLATE_P (type)
5908 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5911 /* Round the RM size up to a unit boundary to get the minimal size
5912 for a BLKmode record. Give up if it's already the size. */
5913 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5914 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5915 if (new_size == size)
5918 align = new_size & -new_size;
5919 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5922 TYPE_USER_ALIGN (new_type) = 1;
5924 /* Now copy the fields, keeping the position and size as we don't want
5925 to change the layout by propagating the packedness downwards. */
5926 for (old_field = TYPE_FIELDS (type); old_field;
5927 old_field = TREE_CHAIN (old_field))
5929 tree new_field_type = TREE_TYPE (old_field);
5930 tree new_field, new_size;
5932 if ((TREE_CODE (new_field_type) == RECORD_TYPE
5933 || TREE_CODE (new_field_type) == UNION_TYPE
5934 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5935 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5936 && host_integerp (TYPE_SIZE (new_field_type), 1))
5937 new_field_type = make_packable_type (new_field_type, true);
5939 /* However, for the last field in a not already packed record type
5940 that is of an aggregate type, we need to use the RM size in the
5941 packable version of the record type, see finish_record_type. */
5942 if (!TREE_CHAIN (old_field)
5943 && !TYPE_PACKED (type)
5944 && (TREE_CODE (new_field_type) == RECORD_TYPE
5945 || TREE_CODE (new_field_type) == UNION_TYPE
5946 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5947 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5948 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5949 && TYPE_ADA_SIZE (new_field_type))
5950 new_size = TYPE_ADA_SIZE (new_field_type);
5952 new_size = DECL_SIZE (old_field);
5954 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5955 new_type, TYPE_PACKED (type), new_size,
5956 bit_position (old_field),
5957 !DECL_NONADDRESSABLE_P (old_field));
5959 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
5960 SET_DECL_ORIGINAL_FIELD
5961 (new_field, (DECL_ORIGINAL_FIELD (old_field)
5962 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
5964 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
5965 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
5967 TREE_CHAIN (new_field) = field_list;
5968 field_list = new_field;
5971 finish_record_type (new_type, nreverse (field_list), 2, true);
5972 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
5974 /* If this is a padding record, we never want to make the size smaller
5975 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
5976 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5977 || TREE_CODE (type) == QUAL_UNION_TYPE)
5979 TYPE_SIZE (new_type) = TYPE_SIZE (type);
5980 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
5984 TYPE_SIZE (new_type) = bitsize_int (new_size);
5985 TYPE_SIZE_UNIT (new_type)
5986 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
5989 if (!TYPE_CONTAINS_TEMPLATE_P (type))
5990 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
5992 compute_record_mode (new_type);
5994 /* Try harder to get a packable type if necessary, for example
5995 in case the record itself contains a BLKmode field. */
5996 if (in_record && TYPE_MODE (new_type) == BLKmode)
5997 SET_TYPE_MODE (new_type,
5998 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
6000 /* If neither the mode nor the size has shrunk, return the old type. */
6001 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
6007 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
6008 if needed. We have already verified that SIZE and TYPE are large enough.
6010 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
6013 IS_USER_TYPE is true if we must complete the original type.
6015 DEFINITION is true if this type is being defined.
6017 SAME_RM_SIZE is true if the RM size of the resulting type is to be set
6018 to SIZE too; otherwise, it's set to the RM size of the original type. */
6021 maybe_pad_type (tree type, tree size, unsigned int align,
6022 Entity_Id gnat_entity, const char *name_trailer,
6023 bool is_user_type, bool definition, bool same_rm_size)
6025 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
6026 tree orig_size = TYPE_SIZE (type);
6027 unsigned int orig_align = align;
6030 /* If TYPE is a padded type, see if it agrees with any size and alignment
6031 we were given. If so, return the original type. Otherwise, strip
6032 off the padding, since we will either be returning the inner type
6033 or repadding it. If no size or alignment is specified, use that of
6034 the original padded type. */
6035 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
6038 || operand_equal_p (round_up (size,
6039 MAX (align, TYPE_ALIGN (type))),
6040 round_up (TYPE_SIZE (type),
6041 MAX (align, TYPE_ALIGN (type))),
6043 && (align == 0 || align == TYPE_ALIGN (type)))
6047 size = TYPE_SIZE (type);
6049 align = TYPE_ALIGN (type);
6051 type = TREE_TYPE (TYPE_FIELDS (type));
6052 orig_size = TYPE_SIZE (type);
6055 /* If the size is either not being changed or is being made smaller (which
6056 is not done here and is only valid for bitfields anyway), show the size
6057 isn't changing. Likewise, clear the alignment if it isn't being
6058 changed. Then return if we aren't doing anything. */
6060 && (operand_equal_p (size, orig_size, 0)
6061 || (TREE_CODE (orig_size) == INTEGER_CST
6062 && tree_int_cst_lt (size, orig_size))))
6065 if (align == TYPE_ALIGN (type))
6068 if (align == 0 && !size)
6071 /* If requested, complete the original type and give it a name. */
6073 create_type_decl (get_entity_name (gnat_entity), type,
6074 NULL, !Comes_From_Source (gnat_entity),
6076 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6077 && DECL_IGNORED_P (TYPE_NAME (type))),
6080 /* We used to modify the record in place in some cases, but that could
6081 generate incorrect debugging information. So make a new record
6083 record = make_node (RECORD_TYPE);
6084 TYPE_IS_PADDING_P (record) = 1;
6086 if (Present (gnat_entity))
6087 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
6089 TYPE_VOLATILE (record)
6090 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6092 TYPE_ALIGN (record) = align;
6094 TYPE_USER_ALIGN (record) = align;
6096 TYPE_SIZE (record) = size ? size : orig_size;
6097 TYPE_SIZE_UNIT (record)
6098 = convert (sizetype,
6099 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6100 bitsize_unit_node));
6102 /* If we are changing the alignment and the input type is a record with
6103 BLKmode and a small constant size, try to make a form that has an
6104 integral mode. This might allow the padding record to also have an
6105 integral mode, which will be much more efficient. There is no point
6106 in doing so if a size is specified unless it is also a small constant
6107 size and it is incorrect to do so if we cannot guarantee that the mode
6108 will be naturally aligned since the field must always be addressable.
6110 ??? This might not always be a win when done for a stand-alone object:
6111 since the nominal and the effective type of the object will now have
6112 different modes, a VIEW_CONVERT_EXPR will be required for converting
6113 between them and it might be hard to overcome afterwards, including
6114 at the RTL level when the stand-alone object is accessed as a whole. */
6116 && TREE_CODE (type) == RECORD_TYPE
6117 && TYPE_MODE (type) == BLKmode
6118 && TREE_CODE (orig_size) == INTEGER_CST
6119 && !TREE_OVERFLOW (orig_size)
6120 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6122 || (TREE_CODE (size) == INTEGER_CST
6123 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6125 tree packable_type = make_packable_type (type, true);
6126 if (TYPE_MODE (packable_type) != BLKmode
6127 && align >= TYPE_ALIGN (packable_type))
6128 type = packable_type;
6131 /* Now create the field with the original size. */
6132 field = create_field_decl (get_identifier ("F"), type, record, 0,
6133 orig_size, bitsize_zero_node, 1);
6134 DECL_INTERNAL_P (field) = 1;
6136 /* Do not finalize it until after the auxiliary record is built. */
6137 finish_record_type (record, field, 1, true);
6139 /* Set the same size for its RM size if requested; otherwise reuse
6140 the RM size of the original type. */
6141 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6143 /* Unless debugging information isn't being written for the input type,
6144 write a record that shows what we are a subtype of and also make a
6145 variable that indicates our size, if still variable. */
6146 if (TYPE_NAME (record)
6147 && AGGREGATE_TYPE_P (type)
6148 && TREE_CODE (orig_size) != INTEGER_CST
6149 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6150 && DECL_IGNORED_P (TYPE_NAME (type))))
6152 tree marker = make_node (RECORD_TYPE);
6153 tree name = TYPE_NAME (record);
6154 tree orig_name = TYPE_NAME (type);
6156 if (TREE_CODE (name) == TYPE_DECL)
6157 name = DECL_NAME (name);
6159 if (TREE_CODE (orig_name) == TYPE_DECL)
6160 orig_name = DECL_NAME (orig_name);
6162 TYPE_NAME (marker) = concat_name (name, "XVS");
6163 finish_record_type (marker,
6164 create_field_decl (orig_name, integer_type_node,
6165 marker, 0, NULL_TREE, NULL_TREE,
6169 add_parallel_type (TYPE_STUB_DECL (record), marker);
6171 if (size && TREE_CODE (size) != INTEGER_CST && definition)
6172 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6173 TYPE_SIZE_UNIT (record), false, false, false,
6174 false, NULL, gnat_entity);
6177 rest_of_record_type_compilation (record);
6179 /* If the size was widened explicitly, maybe give a warning. Take the
6180 original size as the maximum size of the input if there was an
6181 unconstrained record involved and round it up to the specified alignment,
6182 if one was specified. */
6183 if (CONTAINS_PLACEHOLDER_P (orig_size))
6184 orig_size = max_size (orig_size, true);
6187 orig_size = round_up (orig_size, align);
6189 if (size && Present (gnat_entity)
6190 && !operand_equal_p (size, orig_size, 0)
6191 && !(TREE_CODE (size) == INTEGER_CST
6192 && TREE_CODE (orig_size) == INTEGER_CST
6193 && tree_int_cst_lt (size, orig_size)))
6195 Node_Id gnat_error_node = Empty;
6197 if (Is_Packed_Array_Type (gnat_entity))
6198 gnat_entity = Original_Array_Type (gnat_entity);
6200 if ((Ekind (gnat_entity) == E_Component
6201 || Ekind (gnat_entity) == E_Discriminant)
6202 && Present (Component_Clause (gnat_entity)))
6203 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6204 else if (Present (Size_Clause (gnat_entity)))
6205 gnat_error_node = Expression (Size_Clause (gnat_entity));
6207 /* Generate message only for entities that come from source, since
6208 if we have an entity created by expansion, the message will be
6209 generated for some other corresponding source entity. */
6210 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
6211 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
6213 size_diffop (size, orig_size));
6215 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
6216 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6217 gnat_entity, gnat_entity,
6218 size_diffop (size, orig_size));
6224 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6225 the value passed against the list of choices. */
6228 choices_to_gnu (tree operand, Node_Id choices)
6232 tree result = integer_zero_node;
6233 tree this_test, low = 0, high = 0, single = 0;
6235 for (choice = First (choices); Present (choice); choice = Next (choice))
6237 switch (Nkind (choice))
6240 low = gnat_to_gnu (Low_Bound (choice));
6241 high = gnat_to_gnu (High_Bound (choice));
6243 /* There's no good type to use here, so we might as well use
6244 integer_type_node. */
6246 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6247 build_binary_op (GE_EXPR, integer_type_node,
6249 build_binary_op (LE_EXPR, integer_type_node,
6254 case N_Subtype_Indication:
6255 gnat_temp = Range_Expression (Constraint (choice));
6256 low = gnat_to_gnu (Low_Bound (gnat_temp));
6257 high = gnat_to_gnu (High_Bound (gnat_temp));
6260 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6261 build_binary_op (GE_EXPR, integer_type_node,
6263 build_binary_op (LE_EXPR, integer_type_node,
6268 case N_Expanded_Name:
6269 /* This represents either a subtype range, an enumeration
6270 literal, or a constant Ekind says which. If an enumeration
6271 literal or constant, fall through to the next case. */
6272 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6273 && Ekind (Entity (choice)) != E_Constant)
6275 tree type = gnat_to_gnu_type (Entity (choice));
6277 low = TYPE_MIN_VALUE (type);
6278 high = TYPE_MAX_VALUE (type);
6281 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6282 build_binary_op (GE_EXPR, integer_type_node,
6284 build_binary_op (LE_EXPR, integer_type_node,
6289 /* ... fall through ... */
6291 case N_Character_Literal:
6292 case N_Integer_Literal:
6293 single = gnat_to_gnu (choice);
6294 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6298 case N_Others_Choice:
6299 this_test = integer_one_node;
6306 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6313 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6314 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6317 adjust_packed (tree field_type, tree record_type, int packed)
6319 /* If the field contains an item of variable size, we cannot pack it
6320 because we cannot create temporaries of non-fixed size in case
6321 we need to take the address of the field. See addressable_p and
6322 the notes on the addressability issues for further details. */
6323 if (is_variable_size (field_type))
6326 /* If the alignment of the record is specified and the field type
6327 is over-aligned, request Storage_Unit alignment for the field. */
6330 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6339 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6340 placed in GNU_RECORD_TYPE.
6342 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6343 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6344 record has a specified alignment.
6346 DEFINITION is true if this field is for a record being defined. */
6349 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6352 tree gnu_field_id = get_entity_name (gnat_field);
6353 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6354 tree gnu_field, gnu_size, gnu_pos;
6355 bool needs_strict_alignment
6356 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6357 || Treat_As_Volatile (gnat_field));
6359 /* If this field requires strict alignment, we cannot pack it because
6360 it would very likely be under-aligned in the record. */
6361 if (needs_strict_alignment)
6364 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6366 /* If a size is specified, use it. Otherwise, if the record type is packed,
6367 use the official RM size. See "Handling of Type'Size Values" in Einfo
6368 for further details. */
6369 if (Known_Static_Esize (gnat_field))
6370 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6371 gnat_field, FIELD_DECL, false, true);
6372 else if (packed == 1)
6373 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6374 gnat_field, FIELD_DECL, false, true);
6376 gnu_size = NULL_TREE;
6378 /* If we have a specified size that's smaller than that of the field type,
6379 or a position is specified, and the field type is a record, see if we can
6380 get either an integral mode form of the type or a smaller form. If we
6381 can, show a size was specified for the field if there wasn't one already,
6382 so we know to make this a bitfield and avoid making things wider.
6384 Doing this is first useful if the record is packed because we may then
6385 place the field at a non-byte-aligned position and so achieve tighter
6388 This is in addition *required* if the field shares a byte with another
6389 field and the front-end lets the back-end handle the references, because
6390 GCC does not handle BLKmode bitfields properly.
6392 We avoid the transformation if it is not required or potentially useful,
6393 as it might entail an increase of the field's alignment and have ripple
6394 effects on the outer record type. A typical case is a field known to be
6395 byte aligned and not to share a byte with another field.
6397 Besides, we don't even look the possibility of a transformation in cases
6398 known to be in error already, for instance when an invalid size results
6399 from a component clause. */
6401 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6402 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
6403 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6406 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6407 || Present (Component_Clause (gnat_field))))))
6409 /* See what the alternate type and size would be. */
6410 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6412 bool has_byte_aligned_clause
6413 = Present (Component_Clause (gnat_field))
6414 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6415 % BITS_PER_UNIT == 0);
6417 /* Compute whether we should avoid the substitution. */
6419 /* There is no point substituting if there is no change... */
6420 = (gnu_packable_type == gnu_field_type)
6421 /* ... nor when the field is known to be byte aligned and not to
6422 share a byte with another field. */
6423 || (has_byte_aligned_clause
6424 && value_factor_p (gnu_size, BITS_PER_UNIT))
6425 /* The size of an aliased field must be an exact multiple of the
6426 type's alignment, which the substitution might increase. Reject
6427 substitutions that would so invalidate a component clause when the
6428 specified position is byte aligned, as the change would have no
6429 real benefit from the packing standpoint anyway. */
6430 || (Is_Aliased (gnat_field)
6431 && has_byte_aligned_clause
6432 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6434 /* Substitute unless told otherwise. */
6437 gnu_field_type = gnu_packable_type;
6440 gnu_size = rm_size (gnu_field_type);
6444 /* If we are packing the record and the field is BLKmode, round the
6445 size up to a byte boundary. */
6446 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6447 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6449 if (Present (Component_Clause (gnat_field)))
6451 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6452 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6453 gnat_field, FIELD_DECL, false, true);
6455 /* Ensure the position does not overlap with the parent subtype,
6457 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6460 = gnat_to_gnu_type (Parent_Subtype
6461 (Underlying_Type (Scope (gnat_field))));
6463 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6464 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6467 ("offset of& must be beyond parent{, minimum allowed is ^}",
6468 First_Bit (Component_Clause (gnat_field)), gnat_field,
6469 TYPE_SIZE_UNIT (gnu_parent));
6473 /* If this field needs strict alignment, ensure the record is
6474 sufficiently aligned and that that position and size are
6475 consistent with the alignment. */
6476 if (needs_strict_alignment)
6478 TYPE_ALIGN (gnu_record_type)
6479 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6482 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6484 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6486 ("atomic field& must be natural size of type{ (^)}",
6487 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6488 TYPE_SIZE (gnu_field_type));
6490 else if (Is_Aliased (gnat_field))
6492 ("size of aliased field& must be ^ bits",
6493 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6494 TYPE_SIZE (gnu_field_type));
6496 else if (Strict_Alignment (Etype (gnat_field)))
6498 ("size of & with aliased or tagged components not ^ bits",
6499 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6500 TYPE_SIZE (gnu_field_type));
6502 gnu_size = NULL_TREE;
6505 if (!integer_zerop (size_binop
6506 (TRUNC_MOD_EXPR, gnu_pos,
6507 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6509 if (Is_Aliased (gnat_field))
6511 ("position of aliased field& must be multiple of ^ bits",
6512 First_Bit (Component_Clause (gnat_field)), gnat_field,
6513 TYPE_ALIGN (gnu_field_type));
6515 else if (Treat_As_Volatile (gnat_field))
6517 ("position of volatile field& must be multiple of ^ bits",
6518 First_Bit (Component_Clause (gnat_field)), gnat_field,
6519 TYPE_ALIGN (gnu_field_type));
6521 else if (Strict_Alignment (Etype (gnat_field)))
6523 ("position of & with aliased or tagged components not multiple of ^ bits",
6524 First_Bit (Component_Clause (gnat_field)), gnat_field,
6525 TYPE_ALIGN (gnu_field_type));
6530 gnu_pos = NULL_TREE;
6534 if (Is_Atomic (gnat_field))
6535 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6538 /* If the record has rep clauses and this is the tag field, make a rep
6539 clause for it as well. */
6540 else if (Has_Specified_Layout (Scope (gnat_field))
6541 && Chars (gnat_field) == Name_uTag)
6543 gnu_pos = bitsize_zero_node;
6544 gnu_size = TYPE_SIZE (gnu_field_type);
6548 gnu_pos = NULL_TREE;
6550 /* We need to make the size the maximum for the type if it is
6551 self-referential and an unconstrained type. In that case, we can't
6552 pack the field since we can't make a copy to align it. */
6553 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6555 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6556 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6558 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6562 /* If a size is specified, adjust the field's type to it. */
6565 /* If the field's type is justified modular, we would need to remove
6566 the wrapper to (better) meet the layout requirements. However we
6567 can do so only if the field is not aliased to preserve the unique
6568 layout and if the prescribed size is not greater than that of the
6569 packed array to preserve the justification. */
6570 if (!needs_strict_alignment
6571 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6572 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6573 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6575 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6578 = make_type_from_size (gnu_field_type, gnu_size,
6579 Has_Biased_Representation (gnat_field));
6580 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6581 "PAD", false, definition, true);
6584 /* Otherwise (or if there was an error), don't specify a position. */
6586 gnu_pos = NULL_TREE;
6588 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6589 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6591 /* Now create the decl for the field. */
6592 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6593 packed, gnu_size, gnu_pos,
6594 Is_Aliased (gnat_field));
6595 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6596 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6598 if (Ekind (gnat_field) == E_Discriminant)
6599 DECL_DISCRIMINANT_NUMBER (gnu_field)
6600 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6605 /* Return true if TYPE is a type with variable size, a padding type with a
6606 field of variable size or is a record that has a field such a field. */
6609 is_variable_size (tree type)
6613 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6616 if (TREE_CODE (type) == RECORD_TYPE
6617 && TYPE_IS_PADDING_P (type)
6618 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6621 if (TREE_CODE (type) != RECORD_TYPE
6622 && TREE_CODE (type) != UNION_TYPE
6623 && TREE_CODE (type) != QUAL_UNION_TYPE)
6626 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6627 if (is_variable_size (TREE_TYPE (field)))
6633 /* qsort comparer for the bit positions of two record components. */
6636 compare_field_bitpos (const PTR rt1, const PTR rt2)
6638 const_tree const field1 = * (const_tree const *) rt1;
6639 const_tree const field2 = * (const_tree const *) rt2;
6641 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6643 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6646 /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set
6647 the result as the field list of GNU_RECORD_TYPE and finish it up. When
6648 called from gnat_to_gnu_entity during the processing of a record type
6649 definition, the GCC node for the parent, if any, will be the single field
6650 of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the
6651 GNU_FIELD_LIST. The other calls to this function are recursive calls for
6652 the component list of a variant and, in this case, GNU_FIELD_LIST is empty.
6654 PACKED is 1 if this is for a packed record, -1 if this is for a record
6655 with Component_Alignment of Storage_Unit, -2 if this is for a record
6656 with a specified alignment.
6658 DEFINITION is true if we are defining this record.
6660 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6661 with a rep clause is to be added; in this case, that is all that should
6662 be done with such fields.
6664 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6665 laying out the record. This means the alignment only serves to force
6666 fields to be bitfields, but not require the record to be that aligned.
6667 This is used for variants.
6669 ALL_REP, if true, means a rep clause was found for all the fields. This
6670 simplifies the logic since we know we're not in the mixed case.
6672 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6673 modified afterwards so it will not be finalized here.
6675 UNCHECKED_UNION, if true, means that we are building a type for a record
6676 with a Pragma Unchecked_Union. */
6679 components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
6680 tree gnu_field_list, int packed, bool definition,
6681 tree *p_gnu_rep_list, bool cancel_alignment,
6682 bool all_rep, bool do_not_finalize, bool unchecked_union)
6684 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6685 bool layout_with_rep = false;
6686 Node_Id component_decl, variant_part;
6687 tree gnu_our_rep_list = NULL_TREE;
6688 tree gnu_field, gnu_next, gnu_last = tree_last (gnu_field_list);
6690 /* For each component referenced in a component declaration create a GCC
6691 field and add it to the list, skipping pragmas in the GNAT list. */
6692 if (Present (Component_Items (gnat_component_list)))
6694 = First_Non_Pragma (Component_Items (gnat_component_list));
6695 Present (component_decl);
6696 component_decl = Next_Non_Pragma (component_decl))
6698 Entity_Id gnat_field = Defining_Entity (component_decl);
6699 Name_Id gnat_name = Chars (gnat_field);
6701 /* If present, the _Parent field must have been created as the single
6702 field of the record type. Put it before any other fields. */
6703 if (gnat_name == Name_uParent)
6705 gnu_field = TYPE_FIELDS (gnu_record_type);
6706 gnu_field_list = chainon (gnu_field_list, gnu_field);
6710 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6711 packed, definition);
6713 /* If this is the _Tag field, put it before any other fields. */
6714 if (gnat_name == Name_uTag)
6715 gnu_field_list = chainon (gnu_field_list, gnu_field);
6717 /* If this is the _Controller field, put it before the other
6718 fields except for the _Tag or _Parent field. */
6719 else if (gnat_name == Name_uController && gnu_last)
6721 TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last);
6722 TREE_CHAIN (gnu_last) = gnu_field;
6725 /* If this is a regular field, put it after the other fields. */
6728 TREE_CHAIN (gnu_field) = gnu_field_list;
6729 gnu_field_list = gnu_field;
6731 gnu_last = gnu_field;
6735 save_gnu_tree (gnat_field, gnu_field, false);
6738 /* At the end of the component list there may be a variant part. */
6739 variant_part = Variant_Part (gnat_component_list);
6741 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6742 mutually exclusive and should go in the same memory. To do this we need
6743 to treat each variant as a record whose elements are created from the
6744 component list for the variant. So here we create the records from the
6745 lists for the variants and put them all into the QUAL_UNION_TYPE.
6746 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6747 use GNU_RECORD_TYPE if there are no fields so far. */
6748 if (Present (variant_part))
6750 Node_Id gnat_discr = Name (variant_part), variant;
6751 tree gnu_discr = gnat_to_gnu (gnat_discr);
6752 tree gnu_name = TYPE_NAME (gnu_record_type);
6754 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6756 tree gnu_union_type, gnu_union_name, gnu_union_field;
6757 tree gnu_variant_list = NULL_TREE;
6759 if (TREE_CODE (gnu_name) == TYPE_DECL)
6760 gnu_name = DECL_NAME (gnu_name);
6763 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6765 /* Reuse an enclosing union if all fields are in the variant part
6766 and there is no representation clause on the record, to match
6767 the layout of C unions. There is an associated check below. */
6769 && TREE_CODE (gnu_record_type) == UNION_TYPE
6770 && !TYPE_PACKED (gnu_record_type))
6771 gnu_union_type = gnu_record_type;
6775 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6777 TYPE_NAME (gnu_union_type) = gnu_union_name;
6778 TYPE_ALIGN (gnu_union_type) = 0;
6779 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6782 for (variant = First_Non_Pragma (Variants (variant_part));
6784 variant = Next_Non_Pragma (variant))
6786 tree gnu_variant_type = make_node (RECORD_TYPE);
6787 tree gnu_inner_name;
6790 Get_Variant_Encoding (variant);
6791 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6792 TYPE_NAME (gnu_variant_type)
6793 = concat_name (gnu_union_name,
6794 IDENTIFIER_POINTER (gnu_inner_name));
6796 /* Set the alignment of the inner type in case we need to make
6797 inner objects into bitfields, but then clear it out so the
6798 record actually gets only the alignment required. */
6799 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6800 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6802 /* Similarly, if the outer record has a size specified and all
6803 fields have record rep clauses, we can propagate the size
6804 into the variant part. */
6805 if (all_rep_and_size)
6807 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6808 TYPE_SIZE_UNIT (gnu_variant_type)
6809 = TYPE_SIZE_UNIT (gnu_record_type);
6812 /* Add the fields into the record type for the variant. Note that we
6813 defer finalizing it until after we are sure to really use it. */
6814 components_to_record (gnu_variant_type, Component_List (variant),
6815 NULL_TREE, packed, definition,
6816 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6817 true, unchecked_union);
6819 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6821 Set_Present_Expr (variant, annotate_value (gnu_qual));
6823 /* If this is an Unchecked_Union and we have exactly one field,
6824 use this field directly to match the layout of C unions. */
6826 && TYPE_FIELDS (gnu_variant_type)
6827 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6828 gnu_field = TYPE_FIELDS (gnu_variant_type);
6831 /* Deal with packedness like in gnat_to_gnu_field. */
6833 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6835 /* Finalize the record type now. We used to throw away
6836 empty records but we no longer do that because we need
6837 them to generate complete debug info for the variant;
6838 otherwise, the union type definition will be lacking
6839 the fields associated with these empty variants. */
6840 rest_of_record_type_compilation (gnu_variant_type);
6842 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6843 gnu_union_type, field_packed,
6845 ? TYPE_SIZE (gnu_variant_type)
6848 ? bitsize_zero_node : 0),
6851 DECL_INTERNAL_P (gnu_field) = 1;
6853 if (!unchecked_union)
6854 DECL_QUALIFIER (gnu_field) = gnu_qual;
6857 TREE_CHAIN (gnu_field) = gnu_variant_list;
6858 gnu_variant_list = gnu_field;
6861 /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */
6862 if (gnu_variant_list)
6864 int union_field_packed;
6866 if (all_rep_and_size)
6868 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6869 TYPE_SIZE_UNIT (gnu_union_type)
6870 = TYPE_SIZE_UNIT (gnu_record_type);
6873 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6874 all_rep_and_size ? 1 : 0, false);
6876 /* If GNU_UNION_TYPE is our record type, it means we must have an
6877 Unchecked_Union with no fields. Verify that and, if so, just
6879 if (gnu_union_type == gnu_record_type)
6881 gcc_assert (unchecked_union
6883 && !gnu_our_rep_list);
6887 /* Deal with packedness like in gnat_to_gnu_field. */
6889 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6892 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6894 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6895 all_rep ? bitsize_zero_node : 0, 0);
6897 DECL_INTERNAL_P (gnu_union_field) = 1;
6898 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6899 gnu_field_list = gnu_union_field;
6903 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6904 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do
6905 this in a separate pass since we want to handle the discriminants but
6906 can't play with them until we've used them in debugging data above.
6908 ??? If we then reorder them, debugging information will be wrong but
6909 there's nothing that can be done about this at the moment. */
6910 gnu_last = NULL_TREE;
6911 for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next)
6913 gnu_next = TREE_CHAIN (gnu_field);
6915 if (DECL_FIELD_OFFSET (gnu_field))
6918 gnu_field_list = gnu_next;
6920 TREE_CHAIN (gnu_last) = gnu_next;
6922 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6923 gnu_our_rep_list = gnu_field;
6926 gnu_last = gnu_field;
6929 /* If we have any fields in our rep'ed field list and it is not the case that
6930 all the fields in the record have rep clauses and P_REP_LIST is nonzero,
6931 set it and ignore these fields. */
6932 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6933 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6935 /* Otherwise, sort the fields by bit position and put them into their own
6936 record, before the others, if we also have fields without rep clauses. */
6937 else if (gnu_our_rep_list)
6940 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6941 int i, len = list_length (gnu_our_rep_list);
6942 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6944 for (gnu_field = gnu_our_rep_list, i = 0;
6946 gnu_field = TREE_CHAIN (gnu_field), i++)
6947 gnu_arr[i] = gnu_field;
6949 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6951 /* Put the fields in the list in order of increasing position, which
6952 means we start from the end. */
6953 gnu_our_rep_list = NULL_TREE;
6954 for (i = len - 1; i >= 0; i--)
6956 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6957 gnu_our_rep_list = gnu_arr[i];
6958 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
6963 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
6965 = create_field_decl (get_identifier ("REP"), gnu_rep_type,
6966 gnu_record_type, 0, NULL_TREE, NULL_TREE, 1);
6967 DECL_INTERNAL_P (gnu_field) = 1;
6968 gnu_field_list = chainon (gnu_field_list, gnu_field);
6972 layout_with_rep = true;
6973 gnu_field_list = nreverse (gnu_our_rep_list);
6977 if (cancel_alignment)
6978 TYPE_ALIGN (gnu_record_type) = 0;
6980 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
6981 layout_with_rep ? 1 : 0, do_not_finalize);
6984 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
6985 placed into an Esize, Component_Bit_Offset, or Component_Size value
6986 in the GNAT tree. */
6989 annotate_value (tree gnu_size)
6991 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
6993 Node_Ref_Or_Val ops[3], ret;
6996 struct tree_int_map **h = NULL;
6998 /* See if we've already saved the value for this node. */
6999 if (EXPR_P (gnu_size))
7001 struct tree_int_map in;
7002 if (!annotate_value_cache)
7003 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
7004 tree_int_map_eq, 0);
7005 in.base.from = gnu_size;
7006 h = (struct tree_int_map **)
7007 htab_find_slot (annotate_value_cache, &in, INSERT);
7010 return (Node_Ref_Or_Val) (*h)->to;
7013 /* If we do not return inside this switch, TCODE will be set to the
7014 code to use for a Create_Node operand and LEN (set above) will be
7015 the number of recursive calls for us to make. */
7017 switch (TREE_CODE (gnu_size))
7020 if (TREE_OVERFLOW (gnu_size))
7023 /* This may have come from a conversion from some smaller type,
7024 so ensure this is in bitsizetype. */
7025 gnu_size = convert (bitsizetype, gnu_size);
7027 /* For negative values, use NEGATE_EXPR of the supplied value. */
7028 if (tree_int_cst_sgn (gnu_size) < 0)
7030 /* The ridiculous code below is to handle the case of the largest
7031 negative integer. */
7032 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
7033 bool adjust = false;
7036 if (TREE_OVERFLOW (negative_size))
7039 = size_binop (MINUS_EXPR, bitsize_zero_node,
7040 size_binop (PLUS_EXPR, gnu_size,
7045 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
7047 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
7049 return annotate_value (temp);
7052 if (!host_integerp (gnu_size, 1))
7055 size = tree_low_cst (gnu_size, 1);
7057 /* This peculiar test is to make sure that the size fits in an int
7058 on machines where HOST_WIDE_INT is not "int". */
7059 if (tree_low_cst (gnu_size, 1) == size)
7060 return UI_From_Int (size);
7065 /* The only case we handle here is a simple discriminant reference. */
7066 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
7067 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
7068 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7069 return Create_Node (Discrim_Val,
7070 annotate_value (DECL_DISCRIMINANT_NUMBER
7071 (TREE_OPERAND (gnu_size, 1))),
7076 CASE_CONVERT: case NON_LVALUE_EXPR:
7077 return annotate_value (TREE_OPERAND (gnu_size, 0));
7079 /* Now just list the operations we handle. */
7080 case COND_EXPR: tcode = Cond_Expr; break;
7081 case PLUS_EXPR: tcode = Plus_Expr; break;
7082 case MINUS_EXPR: tcode = Minus_Expr; break;
7083 case MULT_EXPR: tcode = Mult_Expr; break;
7084 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7085 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7086 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7087 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7088 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7089 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7090 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7091 case NEGATE_EXPR: tcode = Negate_Expr; break;
7092 case MIN_EXPR: tcode = Min_Expr; break;
7093 case MAX_EXPR: tcode = Max_Expr; break;
7094 case ABS_EXPR: tcode = Abs_Expr; break;
7095 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7096 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7097 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7098 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7099 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7100 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7101 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7102 case LT_EXPR: tcode = Lt_Expr; break;
7103 case LE_EXPR: tcode = Le_Expr; break;
7104 case GT_EXPR: tcode = Gt_Expr; break;
7105 case GE_EXPR: tcode = Ge_Expr; break;
7106 case EQ_EXPR: tcode = Eq_Expr; break;
7107 case NE_EXPR: tcode = Ne_Expr; break;
7113 /* Now get each of the operands that's relevant for this code. If any
7114 cannot be expressed as a repinfo node, say we can't. */
7115 for (i = 0; i < 3; i++)
7118 for (i = 0; i < len; i++)
7120 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7121 if (ops[i] == No_Uint)
7125 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7127 /* Save the result in the cache. */
7130 *h = GGC_NEW (struct tree_int_map);
7131 (*h)->base.from = gnu_size;
7138 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
7139 GCC type, set Component_Bit_Offset and Esize to the position and size
7143 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7147 Entity_Id gnat_field;
7149 /* We operate by first making a list of all fields and their positions
7150 (we can get the sizes easily at any time) by a recursive call
7151 and then update all the sizes into the tree. */
7152 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
7153 size_zero_node, bitsize_zero_node,
7156 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
7157 gnat_field = Next_Entity (gnat_field))
7158 if ((Ekind (gnat_field) == E_Component
7159 || (Ekind (gnat_field) == E_Discriminant
7160 && !Is_Unchecked_Union (Scope (gnat_field)))))
7162 tree parent_offset = bitsize_zero_node;
7164 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
7169 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7171 /* In this mode the tag and parent components have not been
7172 generated, so we add the appropriate offset to each
7173 component. For a component appearing in the current
7174 extension, the offset is the size of the parent. */
7175 if (Is_Derived_Type (gnat_entity)
7176 && Original_Record_Component (gnat_field) == gnat_field)
7178 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7181 parent_offset = bitsize_int (POINTER_SIZE);
7184 Set_Component_Bit_Offset
7187 (size_binop (PLUS_EXPR,
7188 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
7189 TREE_VALUE (TREE_VALUE
7190 (TREE_VALUE (gnu_entry)))),
7193 Set_Esize (gnat_field,
7194 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
7196 else if (Is_Tagged_Type (gnat_entity)
7197 && Is_Derived_Type (gnat_entity))
7199 /* If there is no gnu_entry, this is an inherited component whose
7200 position is the same as in the parent type. */
7201 Set_Component_Bit_Offset
7203 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7204 Set_Esize (gnat_field,
7205 Esize (Original_Record_Component (gnat_field)));
7210 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
7211 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
7212 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
7213 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
7214 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
7215 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
7219 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
7220 tree gnu_bitpos, unsigned int offset_align)
7223 tree gnu_result = gnu_list;
7225 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
7226 gnu_field = TREE_CHAIN (gnu_field))
7228 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7229 DECL_FIELD_BIT_OFFSET (gnu_field));
7230 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7231 DECL_FIELD_OFFSET (gnu_field));
7232 unsigned int our_offset_align
7233 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7236 = tree_cons (gnu_field,
7237 tree_cons (gnu_our_offset,
7238 tree_cons (size_int (our_offset_align),
7239 gnu_our_bitpos, NULL_TREE),
7243 if (DECL_INTERNAL_P (gnu_field))
7245 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
7246 gnu_our_offset, gnu_our_bitpos,
7253 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7254 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7255 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7256 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7257 for the size of a field. COMPONENT_P is true if we are being called
7258 to process the Component_Size of GNAT_OBJECT. This is used for error
7259 message handling and to indicate to use the object size of GNU_TYPE.
7260 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7261 it means that a size of zero should be treated as an unspecified size. */
7264 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7265 enum tree_code kind, bool component_p, bool zero_ok)
7267 Node_Id gnat_error_node;
7268 tree type_size, size;
7270 if (kind == VAR_DECL
7271 /* If a type needs strict alignment, a component of this type in
7272 a packed record cannot be packed and thus uses the type size. */
7273 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7274 type_size = TYPE_SIZE (gnu_type);
7276 type_size = rm_size (gnu_type);
7278 /* Find the node to use for errors. */
7279 if ((Ekind (gnat_object) == E_Component
7280 || Ekind (gnat_object) == E_Discriminant)
7281 && Present (Component_Clause (gnat_object)))
7282 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7283 else if (Present (Size_Clause (gnat_object)))
7284 gnat_error_node = Expression (Size_Clause (gnat_object));
7286 gnat_error_node = gnat_object;
7288 /* Return 0 if no size was specified, either because Esize was not Present
7289 or the specified size was zero. */
7290 if (No (uint_size) || uint_size == No_Uint)
7293 /* Get the size as a tree. Issue an error if a size was specified but
7294 cannot be represented in sizetype. */
7295 size = UI_To_gnu (uint_size, bitsizetype);
7296 if (TREE_OVERFLOW (size))
7298 post_error_ne (component_p ? "component size of & is too large"
7299 : "size of & is too large",
7300 gnat_error_node, gnat_object);
7304 /* Ignore a negative size since that corresponds to our back-annotation.
7305 Also ignore a zero size if it is not permitted. */
7306 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7309 /* The size of objects is always a multiple of a byte. */
7310 if (kind == VAR_DECL
7311 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7314 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7315 gnat_error_node, gnat_object);
7317 post_error_ne ("size for& is not a multiple of Storage_Unit",
7318 gnat_error_node, gnat_object);
7322 /* If this is an integral type or a packed array type, the front-end has
7323 verified the size, so we need not do it here (which would entail
7324 checking against the bounds). However, if this is an aliased object,
7325 it may not be smaller than the type of the object. */
7326 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7327 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7330 /* If the object is a record that contains a template, add the size of
7331 the template to the specified size. */
7332 if (TREE_CODE (gnu_type) == RECORD_TYPE
7333 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7334 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7336 /* Modify the size of the type to be that of the maximum size if it has a
7338 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7339 type_size = max_size (type_size, true);
7341 /* If this is an access type or a fat pointer, the minimum size is that given
7342 by the smallest integral mode that's valid for pointers. */
7343 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7345 enum machine_mode p_mode;
7347 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7348 !targetm.valid_pointer_mode (p_mode);
7349 p_mode = GET_MODE_WIDER_MODE (p_mode))
7352 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7355 /* If the size of the object is a constant, the new size must not be
7357 if (TREE_CODE (type_size) != INTEGER_CST
7358 || TREE_OVERFLOW (type_size)
7359 || tree_int_cst_lt (size, type_size))
7363 ("component size for& too small{, minimum allowed is ^}",
7364 gnat_error_node, gnat_object, type_size);
7366 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7367 gnat_error_node, gnat_object, type_size);
7369 if (kind == VAR_DECL && !component_p
7370 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7371 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7372 post_error_ne_tree_2
7373 ("\\size of ^ is not a multiple of alignment (^ bits)",
7374 gnat_error_node, gnat_object, rm_size (gnu_type),
7375 TYPE_ALIGN (gnu_type));
7377 else if (INTEGRAL_TYPE_P (gnu_type))
7378 post_error_ne ("\\size would be legal if & were not aliased!",
7379 gnat_error_node, gnat_object);
7387 /* Similarly, but both validate and process a value of RM size. This
7388 routine is only called for types. */
7391 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7393 /* Only issue an error if a Value_Size clause was explicitly given.
7394 Otherwise, we'd be duplicating an error on the Size clause. */
7395 Node_Id gnat_attr_node
7396 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7397 tree old_size = rm_size (gnu_type), size;
7399 /* Do nothing if no size was specified, either because RM size was not
7400 Present or if the specified size was zero. */
7401 if (No (uint_size) || uint_size == No_Uint)
7404 /* Get the size as a tree. Issue an error if a size was specified but
7405 cannot be represented in sizetype. */
7406 size = UI_To_gnu (uint_size, bitsizetype);
7407 if (TREE_OVERFLOW (size))
7409 if (Present (gnat_attr_node))
7410 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7415 /* Ignore a negative size since that corresponds to our back-annotation.
7416 Also ignore a zero size unless a Value_Size clause exists, or a size
7417 clause exists, or this is an integer type, in which case the front-end
7418 will have always set it. */
7419 if (tree_int_cst_sgn (size) < 0
7420 || (integer_zerop (size)
7421 && No (gnat_attr_node)
7422 && !Has_Size_Clause (gnat_entity)
7423 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7426 /* If the old size is self-referential, get the maximum size. */
7427 if (CONTAINS_PLACEHOLDER_P (old_size))
7428 old_size = max_size (old_size, true);
7430 /* If the size of the object is a constant, the new size must not be smaller
7431 (the front-end has verified this for scalar and packed array types). */
7432 if (TREE_CODE (old_size) != INTEGER_CST
7433 || TREE_OVERFLOW (old_size)
7434 || (AGGREGATE_TYPE_P (gnu_type)
7435 && !(TREE_CODE (gnu_type) == ARRAY_TYPE
7436 && TYPE_PACKED_ARRAY_TYPE_P (gnu_type))
7437 && !(TREE_CODE (gnu_type) == RECORD_TYPE
7438 && TYPE_IS_PADDING_P (gnu_type)
7439 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE
7440 && TYPE_PACKED_ARRAY_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_type))))
7441 && tree_int_cst_lt (size, old_size)))
7443 if (Present (gnat_attr_node))
7445 ("Value_Size for& too small{, minimum allowed is ^}",
7446 gnat_attr_node, gnat_entity, old_size);
7450 /* Otherwise, set the RM size proper for integral types... */
7451 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7452 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7453 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7454 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7455 SET_TYPE_RM_SIZE (gnu_type, size);
7457 /* ...or the Ada size for record and union types. */
7458 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7459 || TREE_CODE (gnu_type) == UNION_TYPE
7460 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7461 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7462 SET_TYPE_ADA_SIZE (gnu_type, size);
7465 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7466 If TYPE is the best type, return it. Otherwise, make a new type. We
7467 only support new integral and pointer types. FOR_BIASED is true if
7468 we are making a biased type. */
7471 make_type_from_size (tree type, tree size_tree, bool for_biased)
7473 unsigned HOST_WIDE_INT size;
7477 /* If size indicates an error, just return TYPE to avoid propagating
7478 the error. Likewise if it's too large to represent. */
7479 if (!size_tree || !host_integerp (size_tree, 1))
7482 size = tree_low_cst (size_tree, 1);
7484 switch (TREE_CODE (type))
7489 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7490 && TYPE_BIASED_REPRESENTATION_P (type));
7492 /* Only do something if the type is not a packed array type and
7493 doesn't already have the proper size. */
7494 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7495 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7498 biased_p |= for_biased;
7499 if (size > LONG_LONG_TYPE_SIZE)
7500 size = LONG_LONG_TYPE_SIZE;
7502 if (TYPE_UNSIGNED (type) || biased_p)
7503 new_type = make_unsigned_type (size);
7505 new_type = make_signed_type (size);
7506 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7507 SET_TYPE_RM_MIN_VALUE (new_type,
7508 convert (TREE_TYPE (new_type),
7509 TYPE_MIN_VALUE (type)));
7510 SET_TYPE_RM_MAX_VALUE (new_type,
7511 convert (TREE_TYPE (new_type),
7512 TYPE_MAX_VALUE (type)));
7513 /* Propagate the name to avoid creating a fake subrange type. */
7514 if (TYPE_NAME (type))
7516 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7517 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7519 TYPE_NAME (new_type) = TYPE_NAME (type);
7521 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7522 SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
7526 /* Do something if this is a fat pointer, in which case we
7527 may need to return the thin pointer. */
7528 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7530 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7531 if (!targetm.valid_pointer_mode (p_mode))
7534 build_pointer_type_for_mode
7535 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7541 /* Only do something if this is a thin pointer, in which case we
7542 may need to return the fat pointer. */
7543 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7545 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7555 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7556 a type or object whose present alignment is ALIGN. If this alignment is
7557 valid, return it. Otherwise, give an error and return ALIGN. */
7560 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7562 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7563 unsigned int new_align;
7564 Node_Id gnat_error_node;
7566 /* Don't worry about checking alignment if alignment was not specified
7567 by the source program and we already posted an error for this entity. */
7568 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7571 /* Post the error on the alignment clause if any. */
7572 if (Present (Alignment_Clause (gnat_entity)))
7573 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7575 gnat_error_node = gnat_entity;
7577 /* Within GCC, an alignment is an integer, so we must make sure a value is
7578 specified that fits in that range. Also, there is an upper bound to
7579 alignments we can support/allow. */
7580 if (!UI_Is_In_Int_Range (alignment)
7581 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7582 post_error_ne_num ("largest supported alignment for& is ^",
7583 gnat_error_node, gnat_entity, max_allowed_alignment);
7584 else if (!(Present (Alignment_Clause (gnat_entity))
7585 && From_At_Mod (Alignment_Clause (gnat_entity)))
7586 && new_align * BITS_PER_UNIT < align)
7588 unsigned int double_align;
7589 bool is_capped_double, align_clause;
7591 /* If the default alignment of "double" or larger scalar types is
7592 specifically capped and the new alignment is above the cap, do
7593 not post an error and change the alignment only if there is an
7594 alignment clause; this makes it possible to have the associated
7595 GCC type overaligned by default for performance reasons. */
7596 if ((double_align = double_float_alignment) > 0)
7599 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7601 = is_double_float_or_array (gnat_type, &align_clause);
7603 else if ((double_align = double_scalar_alignment) > 0)
7606 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7608 = is_double_scalar_or_array (gnat_type, &align_clause);
7611 is_capped_double = align_clause = false;
7613 if (is_capped_double && new_align >= double_align)
7616 align = new_align * BITS_PER_UNIT;
7620 if (is_capped_double)
7621 align = double_align * BITS_PER_UNIT;
7623 post_error_ne_num ("alignment for& must be at least ^",
7624 gnat_error_node, gnat_entity,
7625 align / BITS_PER_UNIT);
7630 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7631 if (new_align > align)
7638 /* Return the smallest alignment not less than SIZE. */
7641 ceil_alignment (unsigned HOST_WIDE_INT size)
7643 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7646 /* Verify that OBJECT, a type or decl, is something we can implement
7647 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7648 if we require atomic components. */
7651 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7653 Node_Id gnat_error_point = gnat_entity;
7655 enum machine_mode mode;
7659 /* There are three case of what OBJECT can be. It can be a type, in which
7660 case we take the size, alignment and mode from the type. It can be a
7661 declaration that was indirect, in which case the relevant values are
7662 that of the type being pointed to, or it can be a normal declaration,
7663 in which case the values are of the decl. The code below assumes that
7664 OBJECT is either a type or a decl. */
7665 if (TYPE_P (object))
7667 mode = TYPE_MODE (object);
7668 align = TYPE_ALIGN (object);
7669 size = TYPE_SIZE (object);
7671 else if (DECL_BY_REF_P (object))
7673 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7674 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7675 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7679 mode = DECL_MODE (object);
7680 align = DECL_ALIGN (object);
7681 size = DECL_SIZE (object);
7684 /* Consider all floating-point types atomic and any types that that are
7685 represented by integers no wider than a machine word. */
7686 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7687 || ((GET_MODE_CLASS (mode) == MODE_INT
7688 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7689 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7692 /* For the moment, also allow anything that has an alignment equal
7693 to its size and which is smaller than a word. */
7694 if (size && TREE_CODE (size) == INTEGER_CST
7695 && compare_tree_int (size, align) == 0
7696 && align <= BITS_PER_WORD)
7699 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7700 gnat_node = Next_Rep_Item (gnat_node))
7702 if (!comp_p && Nkind (gnat_node) == N_Pragma
7703 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7705 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7706 else if (comp_p && Nkind (gnat_node) == N_Pragma
7707 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7708 == Pragma_Atomic_Components))
7709 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7713 post_error_ne ("atomic access to component of & cannot be guaranteed",
7714 gnat_error_point, gnat_entity);
7716 post_error_ne ("atomic access to & cannot be guaranteed",
7717 gnat_error_point, gnat_entity);
7720 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7721 have compatible signatures so that a call using one type may be safely
7722 issued if the actual target function type is the other. Return 1 if it is
7723 the case, 0 otherwise, and post errors on the incompatibilities.
7725 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7726 that calls to the subprogram will have arguments suitable for the later
7727 underlying builtin expansion. */
7730 compatible_signatures_p (tree ftype1, tree ftype2)
7732 /* As of now, we only perform very trivial tests and consider it's the
7733 programmer's responsibility to ensure the type correctness in the Ada
7734 declaration, as in the regular Import cases.
7736 Mismatches typically result in either error messages from the builtin
7737 expander, internal compiler errors, or in a real call sequence. This
7738 should be refined to issue diagnostics helping error detection and
7741 /* Almost fake test, ensuring a use of each argument. */
7742 if (ftype1 == ftype2)
7748 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
7749 type with all size expressions that contain F in a PLACEHOLDER_EXPR
7750 updated by replacing F with R.
7752 The function doesn't update the layout of the type, i.e. it assumes
7753 that the substitution is purely formal. That's why the replacement
7754 value R must itself contain a PLACEHOLDER_EXPR. */
7757 substitute_in_type (tree t, tree f, tree r)
7761 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
7763 switch (TREE_CODE (t))
7770 /* First the domain types of arrays. */
7771 if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t))
7772 || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t)))
7774 tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r);
7775 tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r);
7777 if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t))
7780 new = copy_type (t);
7781 TYPE_GCC_MIN_VALUE (new) = low;
7782 TYPE_GCC_MAX_VALUE (new) = high;
7784 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t))
7786 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7791 /* Then the subtypes. */
7792 if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t))
7793 || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t)))
7795 tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r);
7796 tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r);
7798 if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t))
7801 new = copy_type (t);
7802 SET_TYPE_RM_MIN_VALUE (new, low);
7803 SET_TYPE_RM_MAX_VALUE (new, high);
7811 new = substitute_in_type (TREE_TYPE (t), f, r);
7812 if (new == TREE_TYPE (t))
7815 return build_complex_type (new);
7821 /* These should never show up here. */
7826 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7827 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7829 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7832 new = build_array_type (component, domain);
7833 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7834 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7835 SET_TYPE_MODE (new, TYPE_MODE (t));
7836 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7837 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7838 TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t);
7839 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7840 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7846 case QUAL_UNION_TYPE:
7848 bool changed_field = false;
7851 /* Start out with no fields, make new fields, and chain them
7852 in. If we haven't actually changed the type of any field,
7853 discard everything we've done and return the old type. */
7854 new = copy_type (t);
7855 TYPE_FIELDS (new) = NULL_TREE;
7857 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7859 tree new_field = copy_node (field), new_n;
7861 new_n = substitute_in_type (TREE_TYPE (field), f, r);
7862 if (new_n != TREE_TYPE (field))
7864 TREE_TYPE (new_field) = new_n;
7865 changed_field = true;
7868 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
7869 if (new_n != DECL_FIELD_OFFSET (field))
7871 DECL_FIELD_OFFSET (new_field) = new_n;
7872 changed_field = true;
7875 /* Do the substitution inside the qualifier, if any. */
7876 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7878 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7879 if (new_n != DECL_QUALIFIER (field))
7881 DECL_QUALIFIER (new_field) = new_n;
7882 changed_field = true;
7886 DECL_CONTEXT (new_field) = new;
7887 SET_DECL_ORIGINAL_FIELD (new_field,
7888 (DECL_ORIGINAL_FIELD (field)
7889 ? DECL_ORIGINAL_FIELD (field) : field));
7891 TREE_CHAIN (new_field) = TYPE_FIELDS (new);
7892 TYPE_FIELDS (new) = new_field;
7898 TYPE_FIELDS (new) = nreverse (TYPE_FIELDS (new));
7899 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7900 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7901 SET_TYPE_ADA_SIZE (new, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
7910 /* Return the RM size of GNU_TYPE. This is the actual number of bits
7911 needed to represent the object. */
7914 rm_size (tree gnu_type)
7916 /* For integral types, we store the RM size explicitly. */
7917 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7918 return TYPE_RM_SIZE (gnu_type);
7920 /* Return the RM size of the actual data plus the size of the template. */
7921 if (TREE_CODE (gnu_type) == RECORD_TYPE
7922 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7924 size_binop (PLUS_EXPR,
7925 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7926 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7928 /* For record types, we store the size explicitly. */
7929 if ((TREE_CODE (gnu_type) == RECORD_TYPE
7930 || TREE_CODE (gnu_type) == UNION_TYPE
7931 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7932 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7933 && TYPE_ADA_SIZE (gnu_type))
7934 return TYPE_ADA_SIZE (gnu_type);
7936 /* For other types, this is just the size. */
7937 return TYPE_SIZE (gnu_type);
7940 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7941 fully-qualified name, possibly with type information encoding.
7942 Otherwise, return the name. */
7945 get_entity_name (Entity_Id gnat_entity)
7947 Get_Encoded_Name (gnat_entity);
7948 return get_identifier_with_length (Name_Buffer, Name_Len);
7951 /* Return an identifier representing the external name to be used for
7952 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7953 and the specified suffix. */
7956 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7958 Entity_Kind kind = Ekind (gnat_entity);
7962 String_Template temp = {1, strlen (suffix)};
7963 Fat_Pointer fp = {suffix, &temp};
7964 Get_External_Name_With_Suffix (gnat_entity, fp);
7967 Get_External_Name (gnat_entity, 0);
7969 /* A variable using the Stdcall convention lives in a DLL. We adjust
7970 its name to use the jump table, the _imp__NAME contains the address
7971 for the NAME variable. */
7972 if ((kind == E_Variable || kind == E_Constant)
7973 && Has_Stdcall_Convention (gnat_entity))
7975 const int len = 6 + Name_Len;
7976 char *new_name = (char *) alloca (len + 1);
7977 strcpy (new_name, "_imp__");
7978 strcat (new_name, Name_Buffer);
7979 return get_identifier_with_length (new_name, len);
7982 return get_identifier_with_length (Name_Buffer, Name_Len);
7985 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
7986 string, return a new IDENTIFIER_NODE that is the concatenation of
7987 the name followed by "___" and the specified suffix. */
7990 concat_name (tree gnu_name, const char *suffix)
7992 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
7993 char *new_name = (char *) alloca (len + 1);
7994 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
7995 strcat (new_name, "___");
7996 strcat (new_name, suffix);
7997 return get_identifier_with_length (new_name, len);
8000 #include "gt-ada-decl.h"