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_list) = 1;
2930 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2933 /* Make the fields for the discriminants and put them into the record
2934 unless it's an Unchecked_Union. */
2935 if (Has_Discriminants (gnat_entity))
2936 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2937 Present (gnat_field);
2938 gnat_field = Next_Stored_Discriminant (gnat_field))
2940 /* If this is a record extension and this discriminant is the
2941 renaming of another discriminant, we've handled it above. */
2942 if (Present (Parent_Subtype (gnat_entity))
2943 && Present (Corresponding_Discriminant (gnat_field)))
2947 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2949 /* Make an expression using a PLACEHOLDER_EXPR from the
2950 FIELD_DECL node just created and link that with the
2951 corresponding GNAT defining identifier. */
2952 save_gnu_tree (gnat_field,
2953 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2954 build0 (PLACEHOLDER_EXPR, gnu_type),
2955 gnu_field, NULL_TREE),
2958 if (!is_unchecked_union)
2960 TREE_CHAIN (gnu_field) = gnu_field_list;
2961 gnu_field_list = gnu_field;
2965 /* Add the fields into the record type and finish it up. */
2966 components_to_record (gnu_type, Component_List (record_definition),
2967 gnu_field_list, packed, definition, NULL,
2968 false, all_rep, false, is_unchecked_union);
2970 /* We used to remove the associations of the discriminants and _Parent
2971 for validity checking but we may need them if there's a Freeze_Node
2972 for a subtype used in this record. */
2973 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2974 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2976 /* If it is a tagged record force the type to BLKmode to insure that
2977 these objects will always be put in memory. Likewise for limited
2979 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2980 SET_TYPE_MODE (gnu_type, BLKmode);
2982 /* Fill in locations of fields. */
2983 annotate_rep (gnat_entity, gnu_type);
2985 /* If there are any entities in the chain corresponding to components
2986 that we did not elaborate, ensure we elaborate their types if they
2988 for (gnat_temp = First_Entity (gnat_entity);
2989 Present (gnat_temp);
2990 gnat_temp = Next_Entity (gnat_temp))
2991 if ((Ekind (gnat_temp) == E_Component
2992 || Ekind (gnat_temp) == E_Discriminant)
2993 && Is_Itype (Etype (gnat_temp))
2994 && !present_gnu_tree (gnat_temp))
2995 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2999 case E_Class_Wide_Subtype:
3000 /* If an equivalent type is present, that is what we should use.
3001 Otherwise, fall through to handle this like a record subtype
3002 since it may have constraints. */
3003 if (gnat_equiv_type != gnat_entity)
3005 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
3006 maybe_present = true;
3010 /* ... fall through ... */
3012 case E_Record_Subtype:
3013 /* If Cloned_Subtype is Present it means this record subtype has
3014 identical layout to that type or subtype and we should use
3015 that GCC type for this one. The front end guarantees that
3016 the component list is shared. */
3017 if (Present (Cloned_Subtype (gnat_entity)))
3019 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
3021 maybe_present = true;
3025 /* Otherwise, first ensure the base type is elaborated. Then, if we are
3026 changing the type, make a new type with each field having the type of
3027 the field in the new subtype but the position computed by transforming
3028 every discriminant reference according to the constraints. We don't
3029 see any difference between private and non-private type here since
3030 derivations from types should have been deferred until the completion
3031 of the private type. */
3034 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
3035 tree gnu_base_type, gnu_orig_type;
3039 defer_incomplete_level++;
3040 this_deferred = true;
3043 /* Get the base type initially for its alignment and sizes.
3044 But if it is a padded type, we do all the other work with
3045 the unpadded type. */
3046 gnu_base_type = gnat_to_gnu_type (gnat_base_type);
3048 if (TREE_CODE (gnu_base_type) == RECORD_TYPE
3049 && TYPE_IS_PADDING_P (gnu_base_type))
3050 gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type));
3052 gnu_orig_type = gnu_base_type;
3054 if (present_gnu_tree (gnat_entity))
3056 maybe_present = true;
3060 /* When the subtype has discriminants and these discriminants affect
3061 the initial shape it has inherited, factor them in. But for the
3062 of an Unchecked_Union (it must be an Itype), just return the type.
3064 We can't just test Is_Constrained because private subtypes without
3065 discriminants of types with discriminants with default expressions
3066 are Is_Constrained but aren't constrained! */
3067 if (IN (Ekind (gnat_base_type), Record_Kind)
3068 && !Is_Unchecked_Union (gnat_base_type)
3069 && !Is_For_Access_Subtype (gnat_entity)
3070 && Is_Constrained (gnat_entity)
3071 && Has_Discriminants (gnat_entity)
3072 && Present (Discriminant_Constraint (gnat_entity))
3073 && Stored_Constraint (gnat_entity) != No_Elist)
3076 = compute_field_positions (gnu_orig_type, NULL_TREE,
3077 size_zero_node, bitsize_zero_node,
3080 = build_subst_list (gnat_entity, gnat_base_type, definition);
3081 tree gnu_field_list = NULL_TREE, gnu_temp;
3082 Entity_Id gnat_field;
3084 gnu_type = make_node (RECORD_TYPE);
3085 TYPE_NAME (gnu_type) = gnu_entity_name;
3086 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
3088 /* Set the size, alignment and alias set of the new type to
3089 match that of the old one, doing required substitutions.
3090 We do it this early because we need the size of the new
3091 type below to discard old fields if necessary. */
3092 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
3093 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
3094 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
3095 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
3096 relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY);
3098 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3099 for (gnu_temp = gnu_subst_list;
3100 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3101 TYPE_SIZE (gnu_type)
3102 = substitute_in_expr (TYPE_SIZE (gnu_type),
3103 TREE_PURPOSE (gnu_temp),
3104 TREE_VALUE (gnu_temp));
3106 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
3107 for (gnu_temp = gnu_subst_list;
3108 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3109 TYPE_SIZE_UNIT (gnu_type)
3110 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
3111 TREE_PURPOSE (gnu_temp),
3112 TREE_VALUE (gnu_temp));
3114 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
3115 for (gnu_temp = gnu_subst_list;
3116 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3118 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
3119 TREE_PURPOSE (gnu_temp),
3120 TREE_VALUE (gnu_temp)));
3122 for (gnat_field = First_Entity (gnat_entity);
3123 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3124 if ((Ekind (gnat_field) == E_Component
3125 || Ekind (gnat_field) == E_Discriminant)
3126 && Underlying_Type (Scope (Original_Record_Component
3129 && (No (Corresponding_Discriminant (gnat_field))
3130 || !Is_Tagged_Type (gnat_base_type)))
3133 = gnat_to_gnu_field_decl
3134 (Original_Record_Component (gnat_field));
3137 (purpose_member (gnu_old_field, gnu_pos_list));
3138 tree gnu_pos = TREE_PURPOSE (gnu_offset);
3139 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
3140 tree gnu_field, gnu_field_type, gnu_size, gnu_new_pos;
3141 unsigned int offset_align
3143 (TREE_PURPOSE (TREE_VALUE (gnu_offset)), 1);
3145 /* If the type is the same, retrieve the GCC type from the
3146 old field to take into account possible adjustments. */
3147 if (Etype (gnat_field)
3148 == Etype (Original_Record_Component (gnat_field)))
3149 gnu_field_type = TREE_TYPE (gnu_old_field);
3151 gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
3153 gnu_size = TYPE_SIZE (gnu_field_type);
3155 /* If there was a component clause, the field types must be
3156 the same for the type and subtype, so copy the data from
3157 the old field to avoid recomputation here. Also if the
3158 field is justified modular and the optimization in
3159 gnat_to_gnu_field was applied. */
3160 if (Present (Component_Clause
3161 (Original_Record_Component (gnat_field)))
3162 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
3163 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
3164 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
3165 == TREE_TYPE (gnu_old_field)))
3167 gnu_size = DECL_SIZE (gnu_old_field);
3168 gnu_field_type = TREE_TYPE (gnu_old_field);
3171 /* If the old field was packed and of constant size, we
3172 have to get the old size here, as it might differ from
3173 what the Etype conveys and the latter might overlap
3174 onto the following field. Try to arrange the type for
3175 possible better packing along the way. */
3176 else if (DECL_PACKED (gnu_old_field)
3177 && TREE_CODE (DECL_SIZE (gnu_old_field))
3180 gnu_size = DECL_SIZE (gnu_old_field);
3181 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
3182 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
3183 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
3185 = make_packable_type (gnu_field_type, true);
3188 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
3189 for (gnu_temp = gnu_subst_list;
3190 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
3191 gnu_pos = substitute_in_expr (gnu_pos,
3192 TREE_PURPOSE (gnu_temp),
3193 TREE_VALUE (gnu_temp));
3195 /* If the position is now a constant, we can set it as the
3196 position of the field when we make it. Otherwise, we
3197 need to deal with it specially below. */
3198 if (TREE_CONSTANT (gnu_pos))
3200 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
3202 /* Discard old fields that are outside the new type.
3203 This avoids confusing code scanning it to decide
3204 how to pass it to functions on some platforms. */
3205 if (TREE_CODE (gnu_new_pos) == INTEGER_CST
3206 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST
3207 && !integer_zerop (gnu_size)
3208 && !tree_int_cst_lt (gnu_new_pos,
3209 TYPE_SIZE (gnu_type)))
3213 gnu_new_pos = NULL_TREE;
3217 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
3218 DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos,
3219 !DECL_NONADDRESSABLE_P (gnu_old_field));
3221 if (!TREE_CONSTANT (gnu_pos))
3223 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
3224 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
3225 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
3226 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
3227 DECL_SIZE (gnu_field) = gnu_size;
3228 DECL_SIZE_UNIT (gnu_field)
3229 = convert (sizetype,
3230 size_binop (CEIL_DIV_EXPR, gnu_size,
3231 bitsize_unit_node));
3232 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
3235 DECL_INTERNAL_P (gnu_field)
3236 = DECL_INTERNAL_P (gnu_old_field);
3237 SET_DECL_ORIGINAL_FIELD
3238 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
3239 ? DECL_ORIGINAL_FIELD (gnu_old_field)
3241 DECL_DISCRIMINANT_NUMBER (gnu_field)
3242 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
3243 TREE_THIS_VOLATILE (gnu_field)
3244 = TREE_THIS_VOLATILE (gnu_old_field);
3246 /* To match the layout crafted in components_to_record, if
3247 this is the _Tag field, put it before any discriminants
3248 instead of after them as for all other fields. */
3249 if (Chars (gnat_field) == Name_uTag)
3250 gnu_field_list = chainon (gnu_field_list, gnu_field);
3253 TREE_CHAIN (gnu_field) = gnu_field_list;
3254 gnu_field_list = gnu_field;
3257 save_gnu_tree (gnat_field, gnu_field, false);
3260 /* Now go through the entities again looking for Itypes that
3261 we have not elaborated but should (e.g., Etypes of fields
3262 that have Original_Components). */
3263 for (gnat_field = First_Entity (gnat_entity);
3264 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
3265 if ((Ekind (gnat_field) == E_Discriminant
3266 || Ekind (gnat_field) == E_Component)
3267 && !present_gnu_tree (Etype (gnat_field)))
3268 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
3270 /* Do not finalize it since we're going to modify it below. */
3271 gnu_field_list = nreverse (gnu_field_list);
3272 finish_record_type (gnu_type, gnu_field_list, 2, true);
3274 /* Finalize size and mode. */
3275 TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type));
3276 TYPE_SIZE_UNIT (gnu_type)
3277 = variable_size (TYPE_SIZE_UNIT (gnu_type));
3279 compute_record_mode (gnu_type);
3281 /* Fill in locations of fields. */
3282 annotate_rep (gnat_entity, gnu_type);
3284 /* We've built a new type, make an XVS type to show what this
3285 is a subtype of. Some debuggers require the XVS type to be
3286 output first, so do it in that order. */
3289 tree gnu_subtype_marker = make_node (RECORD_TYPE);
3290 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
3292 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
3293 gnu_orig_name = DECL_NAME (gnu_orig_name);
3295 TYPE_NAME (gnu_subtype_marker)
3296 = create_concat_name (gnat_entity, "XVS");
3297 finish_record_type (gnu_subtype_marker,
3298 create_field_decl (gnu_orig_name,
3305 add_parallel_type (TYPE_STUB_DECL (gnu_type),
3306 gnu_subtype_marker);
3309 /* Now we can finalize it. */
3310 rest_of_record_type_compilation (gnu_type);
3313 /* Otherwise, go down all the components in the new type and make
3314 them equivalent to those in the base type. */
3317 gnu_type = gnu_orig_type;
3319 for (gnat_temp = First_Entity (gnat_entity);
3320 Present (gnat_temp);
3321 gnat_temp = Next_Entity (gnat_temp))
3322 if ((Ekind (gnat_temp) == E_Discriminant
3323 && !Is_Unchecked_Union (gnat_base_type))
3324 || Ekind (gnat_temp) == E_Component)
3325 save_gnu_tree (gnat_temp,
3326 gnat_to_gnu_field_decl
3327 (Original_Record_Component (gnat_temp)),
3333 case E_Access_Subprogram_Type:
3334 /* Use the special descriptor type for dispatch tables if needed,
3335 that is to say for the Prim_Ptr of a-tags.ads and its clones.
3336 Note that we are only required to do so for static tables in
3337 order to be compatible with the C++ ABI, but Ada 2005 allows
3338 to extend library level tagged types at the local level so
3339 we do it in the non-static case as well. */
3340 if (TARGET_VTABLE_USES_DESCRIPTORS
3341 && Is_Dispatch_Table_Entity (gnat_entity))
3343 gnu_type = fdesc_type_node;
3344 gnu_size = TYPE_SIZE (gnu_type);
3348 /* ... fall through ... */
3350 case E_Anonymous_Access_Subprogram_Type:
3351 /* If we are not defining this entity, and we have incomplete
3352 entities being processed above us, make a dummy type and
3353 fill it in later. */
3354 if (!definition && defer_incomplete_level != 0)
3356 struct incomplete *p
3357 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3360 = build_pointer_type
3361 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3362 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3363 !Comes_From_Source (gnat_entity),
3364 debug_info_p, gnat_entity);
3365 this_made_decl = true;
3366 gnu_type = TREE_TYPE (gnu_decl);
3367 save_gnu_tree (gnat_entity, gnu_decl, false);
3370 p->old_type = TREE_TYPE (gnu_type);
3371 p->full_type = Directly_Designated_Type (gnat_entity);
3372 p->next = defer_incomplete_list;
3373 defer_incomplete_list = p;
3377 /* ... fall through ... */
3379 case E_Allocator_Type:
3381 case E_Access_Attribute_Type:
3382 case E_Anonymous_Access_Type:
3383 case E_General_Access_Type:
3385 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
3386 Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type);
3387 bool is_from_limited_with
3388 = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind)
3389 && From_With_Type (gnat_desig_equiv));
3391 /* Get the "full view" of this entity. If this is an incomplete
3392 entity from a limited with, treat its non-limited view as the full
3393 view. Otherwise, if this is an incomplete or private type, use the
3394 full view. In the former case, we might point to a private type,
3395 in which case, we need its full view. Also, we want to look at the
3396 actual type used for the representation, so this takes a total of
3398 Entity_Id gnat_desig_full_direct_first
3399 = (is_from_limited_with ? Non_Limited_View (gnat_desig_equiv)
3400 : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind)
3401 ? Full_View (gnat_desig_equiv) : Empty));
3402 Entity_Id gnat_desig_full_direct
3403 = ((is_from_limited_with
3404 && Present (gnat_desig_full_direct_first)
3405 && IN (Ekind (gnat_desig_full_direct_first), Private_Kind))
3406 ? Full_View (gnat_desig_full_direct_first)
3407 : gnat_desig_full_direct_first);
3408 Entity_Id gnat_desig_full
3409 = Gigi_Equivalent_Type (gnat_desig_full_direct);
3411 /* This the type actually used to represent the designated type,
3412 either gnat_desig_full or gnat_desig_equiv. */
3413 Entity_Id gnat_desig_rep;
3415 /* True if this is a pointer to an unconstrained array. */
3416 bool is_unconstrained_array;
3418 /* We want to know if we'll be seeing the freeze node for any
3419 incomplete type we may be pointing to. */
3421 = (Present (gnat_desig_full)
3422 ? In_Extended_Main_Code_Unit (gnat_desig_full)
3423 : In_Extended_Main_Code_Unit (gnat_desig_type));
3425 /* True if we make a dummy type here. */
3426 bool got_fat_p = false;
3427 /* True if the dummy is a fat pointer. */
3428 bool made_dummy = false;
3429 tree gnu_desig_type = NULL_TREE;
3430 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
3432 if (!targetm.valid_pointer_mode (p_mode))
3435 /* If either the designated type or its full view is an unconstrained
3436 array subtype, replace it with the type it's a subtype of. This
3437 avoids problems with multiple copies of unconstrained array types.
3438 Likewise, if the designated type is a subtype of an incomplete
3439 record type, use the parent type to avoid order of elaboration
3440 issues. This can lose some code efficiency, but there is no
3442 if (Ekind (gnat_desig_equiv) == E_Array_Subtype
3443 && ! Is_Constrained (gnat_desig_equiv))
3444 gnat_desig_equiv = Etype (gnat_desig_equiv);
3445 if (Present (gnat_desig_full)
3446 && ((Ekind (gnat_desig_full) == E_Array_Subtype
3447 && ! Is_Constrained (gnat_desig_full))
3448 || (Ekind (gnat_desig_full) == E_Record_Subtype
3449 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)))
3450 gnat_desig_full = Etype (gnat_desig_full);
3452 /* Now set the type that actually marks the representation of
3453 the designated type and also flag whether we have a unconstrained
3455 gnat_desig_rep = gnat_desig_full ? gnat_desig_full : gnat_desig_equiv;
3456 is_unconstrained_array
3457 = (Is_Array_Type (gnat_desig_rep)
3458 && ! Is_Constrained (gnat_desig_rep));
3460 /* If we are pointing to an incomplete type whose completion is an
3461 unconstrained array, make a fat pointer type. The two types in our
3462 fields will be pointers to dummy nodes and will be replaced in
3463 update_pointer_to. Similarly, if the type itself is a dummy type or
3464 an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE
3465 in case we have any thin pointers to it. */
3466 if (is_unconstrained_array
3467 && (Present (gnat_desig_full)
3468 || (present_gnu_tree (gnat_desig_equiv)
3469 && TYPE_IS_DUMMY_P (TREE_TYPE
3470 (get_gnu_tree (gnat_desig_equiv))))
3471 || (No (gnat_desig_full) && ! in_main_unit
3472 && defer_incomplete_level != 0
3473 && ! present_gnu_tree (gnat_desig_equiv))
3474 || (in_main_unit && is_from_limited_with
3475 && Present (Freeze_Node (gnat_desig_rep)))))
3479 if (present_gnu_tree (gnat_desig_rep))
3480 gnu_old = TREE_TYPE (get_gnu_tree (gnat_desig_rep));
3483 gnu_old = make_dummy_type (gnat_desig_rep);
3485 /* Show the dummy we get will be a fat pointer. */
3486 got_fat_p = made_dummy = true;
3489 /* If the call above got something that has a pointer, that
3490 pointer is our type. This could have happened either
3491 because the type was elaborated or because somebody
3492 else executed the code below. */
3493 gnu_type = TYPE_POINTER_TO (gnu_old);
3496 tree gnu_template_type = make_node (ENUMERAL_TYPE);
3497 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
3498 tree gnu_array_type = make_node (ENUMERAL_TYPE);
3499 tree gnu_ptr_array = build_pointer_type (gnu_array_type);
3502 TYPE_NAME (gnu_template_type)
3503 = create_concat_name (gnat_desig_equiv, "XUB");
3504 TYPE_DUMMY_P (gnu_template_type) = 1;
3506 TYPE_NAME (gnu_array_type)
3507 = create_concat_name (gnat_desig_equiv, "XUA");
3508 TYPE_DUMMY_P (gnu_array_type) = 1;
3510 gnu_type = make_node (RECORD_TYPE);
3511 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
3512 TYPE_POINTER_TO (gnu_old) = gnu_type;
3514 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3516 = chainon (chainon (NULL_TREE,
3518 (get_identifier ("P_ARRAY"),
3520 gnu_type, 0, 0, 0, 0)),
3521 create_field_decl (get_identifier ("P_BOUNDS"),
3523 gnu_type, 0, 0, 0, 0));
3525 /* Make sure we can place this into a register. */
3526 TYPE_ALIGN (gnu_type)
3527 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
3528 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
3530 /* Do not finalize this record type since the types of
3531 its fields are incomplete. */
3532 finish_record_type (gnu_type, fields, 0, true);
3534 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
3535 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
3536 = create_concat_name (gnat_desig_equiv, "XUT");
3537 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
3541 /* If we already know what the full type is, use it. */
3542 else if (Present (gnat_desig_full)
3543 && present_gnu_tree (gnat_desig_full))
3544 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
3546 /* Get the type of the thing we are to point to and build a pointer
3547 to it. If it is a reference to an incomplete or private type with a
3548 full view that is a record, make a dummy type node and get the
3549 actual type later when we have verified it is safe. */
3550 else if ((! in_main_unit
3551 && ! present_gnu_tree (gnat_desig_equiv)
3552 && Present (gnat_desig_full)
3553 && ! present_gnu_tree (gnat_desig_full)
3554 && Is_Record_Type (gnat_desig_full))
3555 /* Likewise if we are pointing to a record or array and we
3556 are to defer elaborating incomplete types. We do this
3557 since this access type may be the full view of some
3558 private type. Note that the unconstrained array case is
3560 || ((! in_main_unit || imported_p)
3561 && defer_incomplete_level != 0
3562 && ! present_gnu_tree (gnat_desig_equiv)
3563 && ((Is_Record_Type (gnat_desig_rep)
3564 || Is_Array_Type (gnat_desig_rep))))
3565 /* If this is a reference from a limited_with type back to our
3566 main unit and there's a Freeze_Node for it, either we have
3567 already processed the declaration and made the dummy type,
3568 in which case we just reuse the latter, or we have not yet,
3569 in which case we make the dummy type and it will be reused
3570 when the declaration is processed. In both cases, the
3571 pointer eventually created below will be automatically
3572 adjusted when the Freeze_Node is processed. Note that the
3573 unconstrained array case is handled above. */
3574 || (in_main_unit && is_from_limited_with
3575 && Present (Freeze_Node (gnat_desig_rep))))
3577 gnu_desig_type = make_dummy_type (gnat_desig_equiv);
3581 /* Otherwise handle the case of a pointer to itself. */
3582 else if (gnat_desig_equiv == gnat_entity)
3585 = build_pointer_type_for_mode (void_type_node, p_mode,
3586 No_Strict_Aliasing (gnat_entity));
3587 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
3590 /* If expansion is disabled, the equivalent type of a concurrent
3591 type is absent, so build a dummy pointer type. */
3592 else if (type_annotate_only && No (gnat_desig_equiv))
3593 gnu_type = ptr_void_type_node;
3595 /* Finally, handle the straightforward case where we can just
3596 elaborate our designated type and point to it. */
3598 gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv);
3600 /* It is possible that a call to gnat_to_gnu_type above resolved our
3601 type. If so, just return it. */
3602 if (present_gnu_tree (gnat_entity))
3604 maybe_present = true;
3608 /* If we have a GCC type for the designated type, possibly modify it
3609 if we are pointing only to constant objects and then make a pointer
3610 to it. Don't do this for unconstrained arrays. */
3611 if (!gnu_type && gnu_desig_type)
3613 if (Is_Access_Constant (gnat_entity)
3614 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3617 = build_qualified_type
3619 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3621 /* Some extra processing is required if we are building a
3622 pointer to an incomplete type (in the GCC sense). We might
3623 have such a type if we just made a dummy, or directly out
3624 of the call to gnat_to_gnu_type above if we are processing
3625 an access type for a record component designating the
3626 record type itself. */
3627 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3629 /* We must ensure that the pointer to variant we make will
3630 be processed by update_pointer_to when the initial type
3631 is completed. Pretend we made a dummy and let further
3632 processing act as usual. */
3635 /* We must ensure that update_pointer_to will not retrieve
3636 the dummy variant when building a properly qualified
3637 version of the complete type. We take advantage of the
3638 fact that get_qualified_type is requiring TYPE_NAMEs to
3639 match to influence build_qualified_type and then also
3640 update_pointer_to here. */
3641 TYPE_NAME (gnu_desig_type)
3642 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3647 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3648 No_Strict_Aliasing (gnat_entity));
3651 /* If we are not defining this object and we made a dummy pointer,
3652 save our current definition, evaluate the actual type, and replace
3653 the tentative type we made with the actual one. If we are to defer
3654 actually looking up the actual type, make an entry in the
3655 deferred list. If this is from a limited with, we have to defer
3656 to the end of the current spec in two cases: first if the
3657 designated type is in the current unit and second if the access
3659 if ((! in_main_unit || is_from_limited_with) && made_dummy)
3662 = TYPE_FAT_POINTER_P (gnu_type)
3663 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3665 if (esize == POINTER_SIZE
3666 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3668 = build_pointer_type
3669 (TYPE_OBJECT_RECORD_TYPE
3670 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3672 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
3673 !Comes_From_Source (gnat_entity),
3674 debug_info_p, gnat_entity);
3675 this_made_decl = true;
3676 gnu_type = TREE_TYPE (gnu_decl);
3677 save_gnu_tree (gnat_entity, gnu_decl, false);
3680 if (defer_incomplete_level == 0
3681 && ! (is_from_limited_with
3683 || In_Extended_Main_Code_Unit (gnat_entity))))
3684 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3685 gnat_to_gnu_type (gnat_desig_equiv));
3687 /* Note that the call to gnat_to_gnu_type here might have
3688 updated gnu_old_type directly, in which case it is not a
3689 dummy type any more when we get into update_pointer_to.
3691 This may happen for instance when the designated type is a
3692 record type, because their elaboration starts with an
3693 initial node from make_dummy_type, which may yield the same
3694 node as the one we got.
3696 Besides, variants of this non-dummy type might have been
3697 created along the way. update_pointer_to is expected to
3698 properly take care of those situations. */
3701 struct incomplete *p
3702 = (struct incomplete *) xmalloc (sizeof
3703 (struct incomplete));
3704 struct incomplete **head
3705 = (is_from_limited_with
3707 || In_Extended_Main_Code_Unit (gnat_entity))
3708 ? &defer_limited_with : &defer_incomplete_list);
3710 p->old_type = gnu_old_type;
3711 p->full_type = gnat_desig_equiv;
3719 case E_Access_Protected_Subprogram_Type:
3720 case E_Anonymous_Access_Protected_Subprogram_Type:
3721 if (type_annotate_only && No (gnat_equiv_type))
3722 gnu_type = ptr_void_type_node;
3725 /* The runtime representation is the equivalent type. */
3726 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
3727 maybe_present = true;
3730 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3731 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3732 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3733 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3734 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3739 case E_Access_Subtype:
3741 /* We treat this as identical to its base type; any constraint is
3742 meaningful only to the front end.
3744 The designated type must be elaborated as well, if it does
3745 not have its own freeze node. Designated (sub)types created
3746 for constrained components of records with discriminants are
3747 not frozen by the front end and thus not elaborated by gigi,
3748 because their use may appear before the base type is frozen,
3749 and because it is not clear that they are needed anywhere in
3750 Gigi. With the current model, there is no correct place where
3751 they could be elaborated. */
3753 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3754 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3755 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3756 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3757 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3759 /* If we are not defining this entity, and we have incomplete
3760 entities being processed above us, make a dummy type and
3761 elaborate it later. */
3762 if (!definition && defer_incomplete_level != 0)
3764 struct incomplete *p
3765 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3767 = build_pointer_type
3768 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3770 p->old_type = TREE_TYPE (gnu_ptr_type);
3771 p->full_type = Directly_Designated_Type (gnat_entity);
3772 p->next = defer_incomplete_list;
3773 defer_incomplete_list = p;
3775 else if (!IN (Ekind (Base_Type
3776 (Directly_Designated_Type (gnat_entity))),
3777 Incomplete_Or_Private_Kind))
3778 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3782 maybe_present = true;
3785 /* Subprogram Entities
3787 The following access functions are defined for subprograms (functions
3790 First_Formal The first formal parameter.
3791 Is_Imported Indicates that the subprogram has appeared in
3792 an INTERFACE or IMPORT pragma. For now we
3793 assume that the external language is C.
3794 Is_Exported Likewise but for an EXPORT pragma.
3795 Is_Inlined True if the subprogram is to be inlined.
3797 In addition for function subprograms we have:
3799 Etype Return type of the function.
3801 Each parameter is first checked by calling must_pass_by_ref on its
3802 type to determine if it is passed by reference. For parameters which
3803 are copied in, if they are Ada In Out or Out parameters, their return
3804 value becomes part of a record which becomes the return type of the
3805 function (C function - note that this applies only to Ada procedures
3806 so there is no Ada return type). Additional code to store back the
3807 parameters will be generated on the caller side. This transformation
3808 is done here, not in the front-end.
3810 The intended result of the transformation can be seen from the
3811 equivalent source rewritings that follow:
3813 struct temp {int a,b};
3814 procedure P (A,B: In Out ...) is temp P (int A,B)
3817 end P; return {A,B};
3824 For subprogram types we need to perform mainly the same conversions to
3825 GCC form that are needed for procedures and function declarations. The
3826 only difference is that at the end, we make a type declaration instead
3827 of a function declaration. */
3829 case E_Subprogram_Type:
3833 /* The first GCC parameter declaration (a PARM_DECL node). The
3834 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3835 actually is the head of this parameter list. */
3836 tree gnu_param_list = NULL_TREE;
3837 /* Likewise for the stub associated with an exported procedure. */
3838 tree gnu_stub_param_list = NULL_TREE;
3839 /* The type returned by a function. If the subprogram is a procedure
3840 this type should be void_type_node. */
3841 tree gnu_return_type = void_type_node;
3842 /* List of fields in return type of procedure with copy-in copy-out
3844 tree gnu_field_list = NULL_TREE;
3845 /* Non-null for subprograms containing parameters passed by copy-in
3846 copy-out (Ada In Out or Out parameters not passed by reference),
3847 in which case it is the list of nodes used to specify the values of
3848 the in out/out parameters that are returned as a record upon
3849 procedure return. The TREE_PURPOSE of an element of this list is
3850 a field of the record and the TREE_VALUE is the PARM_DECL
3851 corresponding to that field. This list will be saved in the
3852 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3853 tree gnu_return_list = NULL_TREE;
3854 /* If an import pragma asks to map this subprogram to a GCC builtin,
3855 this is the builtin DECL node. */
3856 tree gnu_builtin_decl = NULL_TREE;
3857 /* For the stub associated with an exported procedure. */
3858 tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE;
3859 tree gnu_ext_name = create_concat_name (gnat_entity, NULL);
3860 Entity_Id gnat_param;
3861 bool inline_flag = Is_Inlined (gnat_entity);
3862 bool public_flag = Is_Public (gnat_entity) || imported_p;
3864 = (Is_Public (gnat_entity) && !definition) || imported_p;
3866 /* The semantics of "pure" in Ada essentially matches that of "const"
3867 in the back-end. In particular, both properties are orthogonal to
3868 the "nothrow" property if the EH circuitry is explicit in the
3869 internal representation of the back-end. If we are to completely
3870 hide the EH circuitry from it, we need to declare that calls to pure
3871 Ada subprograms that can throw have side effects since they can
3872 trigger an "abnormal" transfer of control flow; thus they can be
3873 neither "const" nor "pure" in the back-end sense. */
3875 = (Exception_Mechanism == Back_End_Exceptions
3876 && Is_Pure (gnat_entity));
3878 bool volatile_flag = No_Return (gnat_entity);
3879 bool returns_by_ref = false;
3880 bool returns_unconstrained = false;
3881 bool returns_by_target_ptr = false;
3882 bool has_copy_in_out = false;
3883 bool has_stub = false;
3886 /* A parameter may refer to this type, so defer completion of any
3887 incomplete types. */
3888 if (kind == E_Subprogram_Type && !definition)
3890 defer_incomplete_level++;
3891 this_deferred = true;
3894 /* If the subprogram has an alias, it is probably inherited, so
3895 we can use the original one. If the original "subprogram"
3896 is actually an enumeration literal, it may be the first use
3897 of its type, so we must elaborate that type now. */
3898 if (Present (Alias (gnat_entity)))
3900 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3901 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3903 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3906 /* Elaborate any Itypes in the parameters of this entity. */
3907 for (gnat_temp = First_Formal_With_Extras (gnat_entity);
3908 Present (gnat_temp);
3909 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3910 if (Is_Itype (Etype (gnat_temp)))
3911 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3916 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3917 corresponding DECL node.
3919 We still want the parameter associations to take place because the
3920 proper generation of calls depends on it (a GNAT parameter without
3921 a corresponding GCC tree has a very specific meaning), so we don't
3923 if (Convention (gnat_entity) == Convention_Intrinsic)
3924 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3926 /* ??? What if we don't find the builtin node above ? warn ? err ?
3927 In the current state we neither warn nor err, and calls will just
3928 be handled as for regular subprograms. */
3930 if (kind == E_Function || kind == E_Subprogram_Type)
3931 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3933 /* If this function returns by reference, make the actual
3934 return type of this function the pointer and mark the decl. */
3935 if (Returns_By_Ref (gnat_entity))
3937 returns_by_ref = true;
3938 gnu_return_type = build_pointer_type (gnu_return_type);
3941 /* If the Mechanism is By_Reference, ensure the return type uses
3942 the machine's by-reference mechanism, which may not the same
3943 as above (e.g., it might be by passing a fake parameter). */
3944 else if (kind == E_Function
3945 && Mechanism (gnat_entity) == By_Reference)
3947 TREE_ADDRESSABLE (gnu_return_type) = 1;
3949 /* We expect this bit to be reset by gigi shortly, so can avoid a
3950 type node copy here. This actually also prevents troubles with
3951 the generation of debug information for the function, because
3952 we might have issued such info for this type already, and would
3953 be attaching a distinct type node to the function if we made a
3957 /* If we are supposed to return an unconstrained array,
3958 actually return a fat pointer and make a note of that. Return
3959 a pointer to an unconstrained record of variable size. */
3960 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3962 gnu_return_type = TREE_TYPE (gnu_return_type);
3963 returns_unconstrained = true;
3966 /* If the type requires a transient scope, the result is allocated
3967 on the secondary stack, so the result type of the function is
3969 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3971 gnu_return_type = build_pointer_type (gnu_return_type);
3972 returns_unconstrained = true;
3975 /* If the type is a padded type and the underlying type would not
3976 be passed by reference or this function has a foreign convention,
3977 return the underlying type. */
3978 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3979 && TYPE_IS_PADDING_P (gnu_return_type)
3980 && (!default_pass_by_ref (TREE_TYPE
3981 (TYPE_FIELDS (gnu_return_type)))
3982 || Has_Foreign_Convention (gnat_entity)))
3983 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3985 /* If the return type has a non-constant size, we convert the function
3986 into a procedure and its caller will pass a pointer to an object as
3987 the first parameter when we call the function. This can happen for
3988 an unconstrained type with a maximum size or a constrained type with
3989 a size not known at compile time. */
3990 if (TYPE_SIZE_UNIT (gnu_return_type)
3991 && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
3993 returns_by_target_ptr = true;
3995 = create_param_decl (get_identifier ("TARGET"),
3996 build_reference_type (gnu_return_type),
3998 gnu_return_type = void_type_node;
4001 /* If the return type has a size that overflows, we cannot have
4002 a function that returns that type. This usage doesn't make
4003 sense anyway, so give an error here. */
4004 if (TYPE_SIZE_UNIT (gnu_return_type)
4005 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))
4006 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
4008 post_error ("cannot return type whose size overflows",
4010 gnu_return_type = copy_node (gnu_return_type);
4011 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
4012 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
4013 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
4014 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
4017 /* Look at all our parameters and get the type of
4018 each. While doing this, build a copy-out structure if
4021 /* Loop over the parameters and get their associated GCC tree.
4022 While doing this, build a copy-out structure if we need one. */
4023 for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0;
4024 Present (gnat_param);
4025 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
4027 tree gnu_param_name = get_entity_name (gnat_param);
4028 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
4029 tree gnu_param, gnu_field;
4030 bool copy_in_copy_out = false;
4031 Mechanism_Type mech = Mechanism (gnat_param);
4033 /* Builtins are expanded inline and there is no real call sequence
4034 involved. So the type expected by the underlying expander is
4035 always the type of each argument "as is". */
4036 if (gnu_builtin_decl)
4038 /* Handle the first parameter of a valued procedure specially. */
4039 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
4040 mech = By_Copy_Return;
4041 /* Otherwise, see if a Mechanism was supplied that forced this
4042 parameter to be passed one way or another. */
4043 else if (mech == Default
4044 || mech == By_Copy || mech == By_Reference)
4046 else if (By_Descriptor_Last <= mech && mech <= By_Descriptor)
4047 mech = By_Descriptor;
4049 else if (By_Short_Descriptor_Last <= mech &&
4050 mech <= By_Short_Descriptor)
4051 mech = By_Short_Descriptor;
4055 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
4056 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
4057 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
4059 mech = By_Reference;
4065 post_error ("unsupported mechanism for&", gnat_param);
4070 = gnat_to_gnu_param (gnat_param, mech, gnat_entity,
4071 Has_Foreign_Convention (gnat_entity),
4074 /* We are returned either a PARM_DECL or a type if no parameter
4075 needs to be passed; in either case, adjust the type. */
4076 if (DECL_P (gnu_param))
4077 gnu_param_type = TREE_TYPE (gnu_param);
4080 gnu_param_type = gnu_param;
4081 gnu_param = NULL_TREE;
4086 /* If it's an exported subprogram, we build a parameter list
4087 in parallel, in case we need to emit a stub for it. */
4088 if (Is_Exported (gnat_entity))
4091 = chainon (gnu_param, gnu_stub_param_list);
4092 /* Change By_Descriptor parameter to By_Reference for
4093 the internal version of an exported subprogram. */
4094 if (mech == By_Descriptor || mech == By_Short_Descriptor)
4097 = gnat_to_gnu_param (gnat_param, By_Reference,
4103 gnu_param = copy_node (gnu_param);
4106 gnu_param_list = chainon (gnu_param, gnu_param_list);
4107 Sloc_to_locus (Sloc (gnat_param),
4108 &DECL_SOURCE_LOCATION (gnu_param));
4109 save_gnu_tree (gnat_param, gnu_param, false);
4111 /* If a parameter is a pointer, this function may modify
4112 memory through it and thus shouldn't be considered
4113 a const function. Also, the memory may be modified
4114 between two calls, so they can't be CSE'ed. The latter
4115 case also handles by-ref parameters. */
4116 if (POINTER_TYPE_P (gnu_param_type)
4117 || TYPE_FAT_POINTER_P (gnu_param_type))
4121 if (copy_in_copy_out)
4123 if (!has_copy_in_out)
4125 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
4126 gnu_return_type = make_node (RECORD_TYPE);
4127 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
4128 has_copy_in_out = true;
4131 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
4132 gnu_return_type, 0, 0, 0, 0);
4133 Sloc_to_locus (Sloc (gnat_param),
4134 &DECL_SOURCE_LOCATION (gnu_field));
4135 TREE_CHAIN (gnu_field) = gnu_field_list;
4136 gnu_field_list = gnu_field;
4137 gnu_return_list = tree_cons (gnu_field, gnu_param,
4142 /* Do not compute record for out parameters if subprogram is
4143 stubbed since structures are incomplete for the back-end. */
4144 if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
4145 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
4148 /* If we have a CICO list but it has only one entry, we convert
4149 this function into a function that simply returns that one
4151 if (list_length (gnu_return_list) == 1)
4152 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
4154 if (Has_Stdcall_Convention (gnat_entity))
4155 prepend_one_attribute_to
4156 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4157 get_identifier ("stdcall"), NULL_TREE,
4160 /* If we are on a target where stack realignment is needed for 'main'
4161 to honor GCC's implicit expectations (stack alignment greater than
4162 what the base ABI guarantees), ensure we do the same for foreign
4163 convention subprograms as they might be used as callbacks from code
4164 breaking such expectations. Note that this applies to task entry
4165 points in particular. */
4166 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
4167 && Has_Foreign_Convention (gnat_entity))
4168 prepend_one_attribute_to
4169 (&attr_list, ATTR_MACHINE_ATTRIBUTE,
4170 get_identifier ("force_align_arg_pointer"), NULL_TREE,
4173 /* The lists have been built in reverse. */
4174 gnu_param_list = nreverse (gnu_param_list);
4176 gnu_stub_param_list = nreverse (gnu_stub_param_list);
4177 gnu_return_list = nreverse (gnu_return_list);
4179 if (Ekind (gnat_entity) == E_Function)
4180 Set_Mechanism (gnat_entity,
4181 (returns_by_ref || returns_unconstrained
4182 ? By_Reference : By_Copy));
4184 = create_subprog_type (gnu_return_type, gnu_param_list,
4185 gnu_return_list, returns_unconstrained,
4186 returns_by_ref, returns_by_target_ptr);
4190 = create_subprog_type (gnu_return_type, gnu_stub_param_list,
4191 gnu_return_list, returns_unconstrained,
4192 returns_by_ref, returns_by_target_ptr);
4194 /* A subprogram (something that doesn't return anything) shouldn't
4195 be considered const since there would be no reason for such a
4196 subprogram. Note that procedures with Out (or In Out) parameters
4197 have already been converted into a function with a return type. */
4198 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
4202 = build_qualified_type (gnu_type,
4203 TYPE_QUALS (gnu_type)
4204 | (TYPE_QUAL_CONST * const_flag)
4205 | (TYPE_QUAL_VOLATILE * volatile_flag));
4207 Sloc_to_locus (Sloc (gnat_entity), &input_location);
4211 = build_qualified_type (gnu_stub_type,
4212 TYPE_QUALS (gnu_stub_type)
4213 | (TYPE_QUAL_CONST * const_flag)
4214 | (TYPE_QUAL_VOLATILE * volatile_flag));
4216 /* If we have a builtin decl for that function, check the signatures
4217 compatibilities. If the signatures are compatible, use the builtin
4218 decl. If they are not, we expect the checker predicate to have
4219 posted the appropriate errors, and just continue with what we have
4221 if (gnu_builtin_decl)
4223 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
4225 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
4227 gnu_decl = gnu_builtin_decl;
4228 gnu_type = gnu_builtin_type;
4233 /* If there was no specified Interface_Name and the external and
4234 internal names of the subprogram are the same, only use the
4235 internal name to allow disambiguation of nested subprograms. */
4236 if (No (Interface_Name (gnat_entity))
4237 && gnu_ext_name == gnu_entity_name)
4238 gnu_ext_name = NULL_TREE;
4240 /* If we are defining the subprogram and it has an Address clause
4241 we must get the address expression from the saved GCC tree for the
4242 subprogram if it has a Freeze_Node. Otherwise, we elaborate
4243 the address expression here since the front-end has guaranteed
4244 in that case that the elaboration has no effects. If there is
4245 an Address clause and we are not defining the object, just
4246 make it a constant. */
4247 if (Present (Address_Clause (gnat_entity)))
4249 tree gnu_address = NULL_TREE;
4253 = (present_gnu_tree (gnat_entity)
4254 ? get_gnu_tree (gnat_entity)
4255 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
4257 save_gnu_tree (gnat_entity, NULL_TREE, false);
4259 /* Convert the type of the object to a reference type that can
4260 alias everything as per 13.3(19). */
4262 = build_reference_type_for_mode (gnu_type, ptr_mode, true);
4264 gnu_address = convert (gnu_type, gnu_address);
4267 = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type,
4268 gnu_address, false, Is_Public (gnat_entity),
4269 extern_flag, false, NULL, gnat_entity);
4270 DECL_BY_REF_P (gnu_decl) = 1;
4273 else if (kind == E_Subprogram_Type)
4274 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4275 !Comes_From_Source (gnat_entity),
4276 debug_info_p, gnat_entity);
4281 gnu_stub_name = gnu_ext_name;
4282 gnu_ext_name = create_concat_name (gnat_entity, "internal");
4283 public_flag = false;
4286 gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name,
4287 gnu_type, gnu_param_list,
4288 inline_flag, public_flag,
4289 extern_flag, attr_list,
4294 = create_subprog_decl (gnu_entity_name, gnu_stub_name,
4295 gnu_stub_type, gnu_stub_param_list,
4297 extern_flag, attr_list,
4299 SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl);
4302 /* This is unrelated to the stub built right above. */
4303 DECL_STUBBED_P (gnu_decl)
4304 = Convention (gnat_entity) == Convention_Stubbed;
4309 case E_Incomplete_Type:
4310 case E_Incomplete_Subtype:
4311 case E_Private_Type:
4312 case E_Private_Subtype:
4313 case E_Limited_Private_Type:
4314 case E_Limited_Private_Subtype:
4315 case E_Record_Type_With_Private:
4316 case E_Record_Subtype_With_Private:
4318 /* Get the "full view" of this entity. If this is an incomplete
4319 entity from a limited with, treat its non-limited view as the
4320 full view. Otherwise, use either the full view or the underlying
4321 full view, whichever is present. This is used in all the tests
4324 = (IN (Ekind (gnat_entity), Incomplete_Kind)
4325 && From_With_Type (gnat_entity))
4326 ? Non_Limited_View (gnat_entity)
4327 : Present (Full_View (gnat_entity))
4328 ? Full_View (gnat_entity)
4329 : Underlying_Full_View (gnat_entity);
4331 /* If this is an incomplete type with no full view, it must be a Taft
4332 Amendment type, in which case we return a dummy type. Otherwise,
4333 just get the type from its Etype. */
4336 if (kind == E_Incomplete_Type)
4338 gnu_type = make_dummy_type (gnat_entity);
4339 gnu_decl = TYPE_STUB_DECL (gnu_type);
4343 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
4345 maybe_present = true;
4350 /* If we already made a type for the full view, reuse it. */
4351 else if (present_gnu_tree (full_view))
4353 gnu_decl = get_gnu_tree (full_view);
4357 /* Otherwise, if we are not defining the type now, get the type
4358 from the full view. But always get the type from the full view
4359 for define on use types, since otherwise we won't see them! */
4360 else if (!definition
4361 || (Is_Itype (full_view)
4362 && No (Freeze_Node (gnat_entity)))
4363 || (Is_Itype (gnat_entity)
4364 && No (Freeze_Node (full_view))))
4366 gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0);
4367 maybe_present = true;
4371 /* For incomplete types, make a dummy type entry which will be
4372 replaced later. Save it as the full declaration's type so
4373 we can do any needed updates when we see it. */
4374 gnu_type = make_dummy_type (gnat_entity);
4375 gnu_decl = TYPE_STUB_DECL (gnu_type);
4376 save_gnu_tree (full_view, gnu_decl, 0);
4380 /* Simple class_wide types are always viewed as their root_type
4381 by Gigi unless an Equivalent_Type is specified. */
4382 case E_Class_Wide_Type:
4383 gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0);
4384 maybe_present = true;
4388 case E_Task_Subtype:
4389 case E_Protected_Type:
4390 case E_Protected_Subtype:
4391 if (type_annotate_only && No (gnat_equiv_type))
4392 gnu_type = void_type_node;
4394 gnu_type = gnat_to_gnu_type (gnat_equiv_type);
4396 maybe_present = true;
4400 gnu_decl = create_label_decl (gnu_entity_name);
4405 /* Nothing at all to do here, so just return an ERROR_MARK and claim
4406 we've already saved it, so we don't try to. */
4407 gnu_decl = error_mark_node;
4415 /* If we had a case where we evaluated another type and it might have
4416 defined this one, handle it here. */
4417 if (maybe_present && present_gnu_tree (gnat_entity))
4419 gnu_decl = get_gnu_tree (gnat_entity);
4423 /* If we are processing a type and there is either no decl for it or
4424 we just made one, do some common processing for the type, such as
4425 handling alignment and possible padding. */
4426 if (is_type && (!gnu_decl || this_made_decl))
4428 if (Is_Tagged_Type (gnat_entity)
4429 || Is_Class_Wide_Equivalent_Type (gnat_entity))
4430 TYPE_ALIGN_OK (gnu_type) = 1;
4432 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
4433 TYPE_BY_REFERENCE_P (gnu_type) = 1;
4435 /* ??? Don't set the size for a String_Literal since it is either
4436 confirming or we don't handle it properly (if the low bound is
4438 if (!gnu_size && kind != E_String_Literal_Subtype)
4439 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
4441 Has_Size_Clause (gnat_entity));
4443 /* If a size was specified, see if we can make a new type of that size
4444 by rearranging the type, for example from a fat to a thin pointer. */
4448 = make_type_from_size (gnu_type, gnu_size,
4449 Has_Biased_Representation (gnat_entity));
4451 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
4452 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
4456 /* If the alignment hasn't already been processed and this is
4457 not an unconstrained array, see if an alignment is specified.
4458 If not, we pick a default alignment for atomic objects. */
4459 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
4461 else if (Known_Alignment (gnat_entity))
4463 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
4464 TYPE_ALIGN (gnu_type));
4466 /* Warn on suspiciously large alignments. This should catch
4467 errors about the (alignment,byte)/(size,bit) discrepancy. */
4468 if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity))
4472 /* If a size was specified, take it into account. Otherwise
4473 use the RM size for records as the type size has already
4474 been adjusted to the alignment. */
4477 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
4478 || TREE_CODE (gnu_type) == UNION_TYPE
4479 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
4480 && !TYPE_IS_FAT_POINTER_P (gnu_type))
4481 size = rm_size (gnu_type);
4483 size = TYPE_SIZE (gnu_type);
4485 /* Consider an alignment as suspicious if the alignment/size
4486 ratio is greater or equal to the byte/bit ratio. */
4487 if (host_integerp (size, 1)
4488 && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT)
4489 post_error_ne ("?suspiciously large alignment specified for&",
4490 Expression (Alignment_Clause (gnat_entity)),
4494 else if (Is_Atomic (gnat_entity) && !gnu_size
4495 && host_integerp (TYPE_SIZE (gnu_type), 1)
4496 && integer_pow2p (TYPE_SIZE (gnu_type)))
4497 align = MIN (BIGGEST_ALIGNMENT,
4498 tree_low_cst (TYPE_SIZE (gnu_type), 1));
4499 else if (Is_Atomic (gnat_entity) && gnu_size
4500 && host_integerp (gnu_size, 1)
4501 && integer_pow2p (gnu_size))
4502 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
4504 /* See if we need to pad the type. If we did, and made a record,
4505 the name of the new type may be changed. So get it back for
4506 us when we make the new TYPE_DECL below. */
4507 if (gnu_size || align > 0)
4508 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
4509 "PAD", true, definition, false);
4511 if (TREE_CODE (gnu_type) == RECORD_TYPE
4512 && TYPE_IS_PADDING_P (gnu_type))
4514 gnu_entity_name = TYPE_NAME (gnu_type);
4515 if (TREE_CODE (gnu_entity_name) == TYPE_DECL)
4516 gnu_entity_name = DECL_NAME (gnu_entity_name);
4519 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
4521 /* If we are at global level, GCC will have applied variable_size to
4522 the type, but that won't have done anything. So, if it's not
4523 a constant or self-referential, call elaborate_expression_1 to
4524 make a variable for the size rather than calculating it each time.
4525 Handle both the RM size and the actual size. */
4526 if (global_bindings_p ()
4527 && TYPE_SIZE (gnu_type)
4528 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
4529 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
4531 if (TREE_CODE (gnu_type) == RECORD_TYPE
4532 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
4533 TYPE_SIZE (gnu_type), 0))
4535 TYPE_SIZE (gnu_type)
4536 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4537 gnat_entity, get_identifier ("SIZE"),
4539 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
4543 TYPE_SIZE (gnu_type)
4544 = elaborate_expression_1 (TYPE_SIZE (gnu_type),
4545 gnat_entity, get_identifier ("SIZE"),
4548 /* ??? For now, store the size as a multiple of the alignment
4549 in bytes so that we can see the alignment from the tree. */
4550 TYPE_SIZE_UNIT (gnu_type)
4552 (MULT_EXPR, sizetype,
4553 elaborate_expression_1
4554 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4555 TYPE_SIZE_UNIT (gnu_type),
4556 size_int (TYPE_ALIGN (gnu_type)
4558 gnat_entity, get_identifier ("SIZE_A_UNIT"),
4560 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4562 if (TREE_CODE (gnu_type) == RECORD_TYPE)
4565 elaborate_expression_1 (TYPE_ADA_SIZE (gnu_type),
4567 get_identifier ("RM_SIZE"),
4568 definition, false));
4572 /* If this is a record type or subtype, call elaborate_expression_1 on
4573 any field position. Do this for both global and local types.
4574 Skip any fields that we haven't made trees for to avoid problems with
4575 class wide types. */
4576 if (IN (kind, Record_Kind))
4577 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
4578 gnat_temp = Next_Entity (gnat_temp))
4579 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
4581 tree gnu_field = get_gnu_tree (gnat_temp);
4583 /* ??? Unfortunately, GCC needs to be able to prove the
4584 alignment of this offset and if it's a variable, it can't.
4585 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4586 right now, we have to put in an explicit multiply and
4587 divide by that value. */
4588 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
4590 DECL_FIELD_OFFSET (gnu_field)
4592 (MULT_EXPR, sizetype,
4593 elaborate_expression_1
4594 (build_binary_op (EXACT_DIV_EXPR, sizetype,
4595 DECL_FIELD_OFFSET (gnu_field),
4596 size_int (DECL_OFFSET_ALIGN (gnu_field)
4598 gnat_temp, get_identifier ("OFFSET"),
4600 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4602 /* ??? The context of gnu_field is not necessarily gnu_type so
4603 the MULT_EXPR node built above may not be marked by the call
4604 to create_type_decl below. */
4605 if (global_bindings_p ())
4606 mark_visited (&DECL_FIELD_OFFSET (gnu_field));
4610 gnu_type = build_qualified_type (gnu_type,
4611 (TYPE_QUALS (gnu_type)
4612 | (TYPE_QUAL_VOLATILE
4613 * Treat_As_Volatile (gnat_entity))));
4615 if (Is_Atomic (gnat_entity))
4616 check_ok_for_atomic (gnu_type, gnat_entity, false);
4618 if (Present (Alignment_Clause (gnat_entity)))
4619 TYPE_USER_ALIGN (gnu_type) = 1;
4621 if (Universal_Aliasing (gnat_entity))
4622 TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1;
4625 gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list,
4626 !Comes_From_Source (gnat_entity),
4627 debug_info_p, gnat_entity);
4629 TREE_TYPE (gnu_decl) = gnu_type;
4632 if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4634 gnu_type = TREE_TYPE (gnu_decl);
4636 /* If this is a derived type, relate its alias set to that of its parent
4637 to avoid troubles when a call to an inherited primitive is inlined in
4638 a context where a derived object is accessed. The inlined code works
4639 on the parent view so the resulting code may access the same object
4640 using both the parent and the derived alias sets, which thus have to
4641 conflict. As the same issue arises with component references, the
4642 parent alias set also has to conflict with composite types enclosing
4643 derived components. For instance, if we have:
4650 we want T to conflict with both D and R, in addition to R being a
4651 superset of D by record/component construction.
4653 One way to achieve this is to perform an alias set copy from the
4654 parent to the derived type. This is not quite appropriate, though,
4655 as we don't want separate derived types to conflict with each other:
4657 type I1 is new Integer;
4658 type I2 is new Integer;
4660 We want I1 and I2 to both conflict with Integer but we do not want
4661 I1 to conflict with I2, and an alias set copy on derivation would
4664 The option chosen is to make the alias set of the derived type a
4665 superset of that of its parent type. It trivially fulfills the
4666 simple requirement for the Integer derivation example above, and
4667 the component case as well by superset transitivity:
4670 R ----------> D ----------> T
4672 The language rules ensure the parent type is already frozen here. */
4673 if (Is_Derived_Type (gnat_entity))
4675 tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity));
4676 relate_alias_sets (gnu_type, gnu_parent_type, ALIAS_SET_SUPERSET);
4679 /* Back-annotate the Alignment of the type if not already in the
4680 tree. Likewise for sizes. */
4681 if (Unknown_Alignment (gnat_entity))
4683 unsigned int double_align, align;
4684 bool is_capped_double, align_clause;
4686 /* If the default alignment of "double" or larger scalar types is
4687 specifically capped and this is not an array with an alignment
4688 clause on the component type, return the cap. */
4689 if ((double_align = double_float_alignment) > 0)
4691 = is_double_float_or_array (gnat_entity, &align_clause);
4692 else if ((double_align = double_scalar_alignment) > 0)
4694 = is_double_scalar_or_array (gnat_entity, &align_clause);
4696 is_capped_double = align_clause = false;
4698 if (is_capped_double && !align_clause)
4699 align = double_align;
4701 align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT;
4703 Set_Alignment (gnat_entity, UI_From_Int (align));
4706 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4708 /* If the size is self-referential, we annotate the maximum
4709 value of that size. */
4710 tree gnu_size = TYPE_SIZE (gnu_type);
4712 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4713 gnu_size = max_size (gnu_size, true);
4715 Set_Esize (gnat_entity, annotate_value (gnu_size));
4717 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4719 /* In this mode the tag and the parent components are not
4720 generated by the front-end, so the sizes must be adjusted
4722 int size_offset, new_size;
4724 if (Is_Derived_Type (gnat_entity))
4727 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4728 Set_Alignment (gnat_entity,
4729 Alignment (Etype (Base_Type (gnat_entity))));
4732 size_offset = POINTER_SIZE;
4734 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4735 Set_Esize (gnat_entity,
4736 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4737 / POINTER_SIZE) * POINTER_SIZE));
4738 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4742 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4743 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4746 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4747 DECL_ARTIFICIAL (gnu_decl) = 1;
4749 if (!debug_info_p && DECL_P (gnu_decl)
4750 && TREE_CODE (gnu_decl) != FUNCTION_DECL
4751 && No (Renamed_Object (gnat_entity)))
4752 DECL_IGNORED_P (gnu_decl) = 1;
4754 /* If we haven't already, associate the ..._DECL node that we just made with
4755 the input GNAT entity node. */
4757 save_gnu_tree (gnat_entity, gnu_decl, false);
4759 /* If this is an enumeration or floating-point type, we were not able to set
4760 the bounds since they refer to the type. These are always static. */
4761 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4762 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4764 tree gnu_scalar_type = gnu_type;
4765 tree gnu_low_bound, gnu_high_bound;
4767 /* If this is a padded type, we need to use the underlying type. */
4768 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4769 && TYPE_IS_PADDING_P (gnu_scalar_type))
4770 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4772 /* If this is a floating point type and we haven't set a floating
4773 point type yet, use this in the evaluation of the bounds. */
4774 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4775 longest_float_type_node = gnu_scalar_type;
4777 gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4778 gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity));
4780 if (kind == E_Enumeration_Type)
4782 /* Enumeration types have specific RM bounds. */
4783 SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound);
4784 SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound);
4786 /* Write full debugging information. Since this has both a
4787 typedef and a tag, avoid outputting the name twice. */
4788 DECL_ARTIFICIAL (gnu_decl) = 1;
4789 rest_of_type_decl_compilation (gnu_decl);
4794 /* Floating-point types don't have specific RM bounds. */
4795 TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound;
4796 TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound;
4800 /* If we deferred processing of incomplete types, re-enable it. If there
4801 were no other disables and we have some to process, do so. */
4802 if (this_deferred && --defer_incomplete_level == 0)
4804 if (defer_incomplete_list)
4806 struct incomplete *incp, *next;
4808 /* We are back to level 0 for the deferring of incomplete types.
4809 But processing these incomplete types below may itself require
4810 deferring, so preserve what we have and restart from scratch. */
4811 incp = defer_incomplete_list;
4812 defer_incomplete_list = NULL;
4814 /* For finalization, however, all types must be complete so we
4815 cannot do the same because deferred incomplete types may end up
4816 referencing each other. Process them all recursively first. */
4817 defer_finalize_level++;
4819 for (; incp; incp = next)
4824 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4825 gnat_to_gnu_type (incp->full_type));
4829 defer_finalize_level--;
4832 /* All the deferred incomplete types have been processed so we can
4833 now proceed with the finalization of the deferred types. */
4834 if (defer_finalize_level == 0 && defer_finalize_list)
4839 for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++)
4840 rest_of_type_decl_compilation_no_defer (t);
4842 VEC_free (tree, heap, defer_finalize_list);
4846 /* If we are not defining this type, see if it's in the incomplete list.
4847 If so, handle that list entry now. */
4848 else if (!definition)
4850 struct incomplete *incp;
4852 for (incp = defer_incomplete_list; incp; incp = incp->next)
4853 if (incp->old_type && incp->full_type == gnat_entity)
4855 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4856 TREE_TYPE (gnu_decl));
4857 incp->old_type = NULL_TREE;
4864 /* If this is a packed array type whose original array type is itself
4865 an Itype without freeze node, make sure the latter is processed. */
4866 if (Is_Packed_Array_Type (gnat_entity)
4867 && Is_Itype (Original_Array_Type (gnat_entity))
4868 && No (Freeze_Node (Original_Array_Type (gnat_entity)))
4869 && !present_gnu_tree (Original_Array_Type (gnat_entity)))
4870 gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0);
4875 /* Similar, but if the returned value is a COMPONENT_REF, return the
4879 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4881 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4883 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4884 gnu_field = TREE_OPERAND (gnu_field, 1);
4889 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4890 the GCC type corresponding to that entity. */
4893 gnat_to_gnu_type (Entity_Id gnat_entity)
4897 /* The back end never attempts to annotate generic types. */
4898 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
4899 return void_type_node;
4901 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4902 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
4904 return TREE_TYPE (gnu_decl);
4907 /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return
4908 the unpadded version of the GCC type corresponding to that entity. */
4911 get_unpadded_type (Entity_Id gnat_entity)
4913 tree type = gnat_to_gnu_type (gnat_entity);
4915 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4916 type = TREE_TYPE (TYPE_FIELDS (type));
4921 /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it.
4922 Every TYPE_DECL generated for a type definition must be passed
4923 to this function once everything else has been done for it. */
4926 rest_of_type_decl_compilation (tree decl)
4928 /* We need to defer finalizing the type if incomplete types
4929 are being deferred or if they are being processed. */
4930 if (defer_incomplete_level || defer_finalize_level)
4931 VEC_safe_push (tree, heap, defer_finalize_list, decl);
4933 rest_of_type_decl_compilation_no_defer (decl);
4936 /* Same as above but without deferring the compilation. This
4937 function should not be invoked directly on a TYPE_DECL. */
4940 rest_of_type_decl_compilation_no_defer (tree decl)
4942 const int toplev = global_bindings_p ();
4943 tree t = TREE_TYPE (decl);
4945 rest_of_decl_compilation (decl, toplev, 0);
4947 /* Now process all the variants. This is needed for STABS. */
4948 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
4950 if (t == TREE_TYPE (decl))
4953 if (!TYPE_STUB_DECL (t))
4954 TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t);
4956 rest_of_type_compilation (t, toplev);
4960 /* Finalize any From_With_Type incomplete types. We do this after processing
4961 our compilation unit and after processing its spec, if this is a body. */
4964 finalize_from_with_types (void)
4966 struct incomplete *incp = defer_limited_with;
4967 struct incomplete *next;
4969 defer_limited_with = 0;
4970 for (; incp; incp = next)
4974 if (incp->old_type != 0)
4975 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4976 gnat_to_gnu_type (incp->full_type));
4981 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
4982 kind of type (such E_Task_Type) that has a different type which Gigi
4983 uses for its representation. If the type does not have a special type
4984 for its representation, return GNAT_ENTITY. If a type is supposed to
4985 exist, but does not, abort unless annotating types, in which case
4986 return Empty. If GNAT_ENTITY is Empty, return Empty. */
4989 Gigi_Equivalent_Type (Entity_Id gnat_entity)
4991 Entity_Id gnat_equiv = gnat_entity;
4993 if (No (gnat_entity))
4996 switch (Ekind (gnat_entity))
4998 case E_Class_Wide_Subtype:
4999 if (Present (Equivalent_Type (gnat_entity)))
5000 gnat_equiv = Equivalent_Type (gnat_entity);
5003 case E_Access_Protected_Subprogram_Type:
5004 case E_Anonymous_Access_Protected_Subprogram_Type:
5005 gnat_equiv = Equivalent_Type (gnat_entity);
5008 case E_Class_Wide_Type:
5009 gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
5010 ? Equivalent_Type (gnat_entity)
5011 : Root_Type (gnat_entity));
5015 case E_Task_Subtype:
5016 case E_Protected_Type:
5017 case E_Protected_Subtype:
5018 gnat_equiv = Corresponding_Record_Type (gnat_entity);
5025 gcc_assert (Present (gnat_equiv) || type_annotate_only);
5029 /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and
5030 using MECH as its passing mechanism, to be placed in the parameter
5031 list built for GNAT_SUBPROG. Assume a foreign convention for the
5032 latter if FOREIGN is true. Also set CICO to true if the parameter
5033 must use the copy-in copy-out implementation mechanism.
5035 The returned tree is a PARM_DECL, except for those cases where no
5036 parameter needs to be actually passed to the subprogram; the type
5037 of this "shadow" parameter is then returned instead. */
5040 gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
5041 Entity_Id gnat_subprog, bool foreign, bool *cico)
5043 tree gnu_param_name = get_entity_name (gnat_param);
5044 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
5045 tree gnu_param_type_alt = NULL_TREE;
5046 bool in_param = (Ekind (gnat_param) == E_In_Parameter);
5047 /* The parameter can be indirectly modified if its address is taken. */
5048 bool ro_param = in_param && !Address_Taken (gnat_param);
5049 bool by_return = false, by_component_ptr = false, by_ref = false;
5052 /* Copy-return is used only for the first parameter of a valued procedure.
5053 It's a copy mechanism for which a parameter is never allocated. */
5054 if (mech == By_Copy_Return)
5056 gcc_assert (Ekind (gnat_param) == E_Out_Parameter);
5061 /* If this is either a foreign function or if the underlying type won't
5062 be passed by reference, strip off possible padding type. */
5063 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
5064 && TYPE_IS_PADDING_P (gnu_param_type))
5066 tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
5068 if (mech == By_Reference
5070 || (!must_pass_by_ref (unpadded_type)
5071 && (mech == By_Copy || !default_pass_by_ref (unpadded_type))))
5072 gnu_param_type = unpadded_type;
5075 /* If this is a read-only parameter, make a variant of the type that is
5076 read-only. ??? However, if this is an unconstrained array, that type
5077 can be very complex, so skip it for now. Likewise for any other
5078 self-referential type. */
5080 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
5081 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
5082 gnu_param_type = build_qualified_type (gnu_param_type,
5083 (TYPE_QUALS (gnu_param_type)
5084 | TYPE_QUAL_CONST));
5086 /* For foreign conventions, pass arrays as pointers to the element type.
5087 First check for unconstrained array and get the underlying array. */
5088 if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
5090 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type))));
5092 /* VMS descriptors are themselves passed by reference. */
5093 if (mech == By_Short_Descriptor ||
5094 (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64))
5096 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5097 Mechanism (gnat_param),
5099 else if (mech == By_Descriptor)
5101 /* Build both a 32-bit and 64-bit descriptor, one of which will be
5102 chosen in fill_vms_descriptor. */
5104 = build_pointer_type (build_vms_descriptor32 (gnu_param_type,
5105 Mechanism (gnat_param),
5108 = build_pointer_type (build_vms_descriptor (gnu_param_type,
5109 Mechanism (gnat_param),
5113 /* Arrays are passed as pointers to element type for foreign conventions. */
5116 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
5118 /* Strip off any multi-dimensional entries, then strip
5119 off the last array to get the component type. */
5120 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
5121 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
5122 gnu_param_type = TREE_TYPE (gnu_param_type);
5124 by_component_ptr = true;
5125 gnu_param_type = TREE_TYPE (gnu_param_type);
5128 gnu_param_type = build_qualified_type (gnu_param_type,
5129 (TYPE_QUALS (gnu_param_type)
5130 | TYPE_QUAL_CONST));
5132 gnu_param_type = build_pointer_type (gnu_param_type);
5135 /* Fat pointers are passed as thin pointers for foreign conventions. */
5136 else if (foreign && TYPE_FAT_POINTER_P (gnu_param_type))
5138 = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0);
5140 /* If we must pass or were requested to pass by reference, do so.
5141 If we were requested to pass by copy, do so.
5142 Otherwise, for foreign conventions, pass In Out or Out parameters
5143 or aggregates by reference. For COBOL and Fortran, pass all
5144 integer and FP types that way too. For Convention Ada, use
5145 the standard Ada default. */
5146 else if (must_pass_by_ref (gnu_param_type)
5147 || mech == By_Reference
5150 && (!in_param || AGGREGATE_TYPE_P (gnu_param_type)))
5152 && (Convention (gnat_subprog) == Convention_Fortran
5153 || Convention (gnat_subprog) == Convention_COBOL)
5154 && (INTEGRAL_TYPE_P (gnu_param_type)
5155 || FLOAT_TYPE_P (gnu_param_type)))
5157 && default_pass_by_ref (gnu_param_type)))))
5159 gnu_param_type = build_reference_type (gnu_param_type);
5163 /* Pass In Out or Out parameters using copy-in copy-out mechanism. */
5167 if (mech == By_Copy && (by_ref || by_component_ptr))
5168 post_error ("?cannot pass & by copy", gnat_param);
5170 /* If this is an Out parameter that isn't passed by reference and isn't
5171 a pointer or aggregate, we don't make a PARM_DECL for it. Instead,
5172 it will be a VAR_DECL created when we process the procedure, so just
5173 return its type. For the special parameter of a valued procedure,
5176 An exception is made to cover the RM-6.4.1 rule requiring "by copy"
5177 Out parameters with discriminants or implicit initial values to be
5178 handled like In Out parameters. These type are normally built as
5179 aggregates, hence passed by reference, except for some packed arrays
5180 which end up encoded in special integer types.
5182 The exception we need to make is then for packed arrays of records
5183 with discriminants or implicit initial values. We have no light/easy
5184 way to check for the latter case, so we merely check for packed arrays
5185 of records. This may lead to useless copy-in operations, but in very
5186 rare cases only, as these would be exceptions in a set of already
5187 exceptional situations. */
5188 if (Ekind (gnat_param) == E_Out_Parameter
5191 || (mech != By_Descriptor
5192 && mech != By_Short_Descriptor
5193 && !POINTER_TYPE_P (gnu_param_type)
5194 && !AGGREGATE_TYPE_P (gnu_param_type)))
5195 && !(Is_Array_Type (Etype (gnat_param))
5196 && Is_Packed (Etype (gnat_param))
5197 && Is_Composite_Type (Component_Type (Etype (gnat_param)))))
5198 return gnu_param_type;
5200 gnu_param = create_param_decl (gnu_param_name, gnu_param_type,
5201 ro_param || by_ref || by_component_ptr);
5202 DECL_BY_REF_P (gnu_param) = by_ref;
5203 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
5204 DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
5205 mech == By_Short_Descriptor);
5206 DECL_POINTS_TO_READONLY_P (gnu_param)
5207 = (ro_param && (by_ref || by_component_ptr));
5209 /* Save the alternate descriptor type, if any. */
5210 if (gnu_param_type_alt)
5211 SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt);
5213 /* If no Mechanism was specified, indicate what we're using, then
5214 back-annotate it. */
5215 if (mech == Default)
5216 mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy;
5218 Set_Mechanism (gnat_param, mech);
5222 /* Return true if DISCR1 and DISCR2 represent the same discriminant. */
5225 same_discriminant_p (Entity_Id discr1, Entity_Id discr2)
5227 while (Present (Corresponding_Discriminant (discr1)))
5228 discr1 = Corresponding_Discriminant (discr1);
5230 while (Present (Corresponding_Discriminant (discr2)))
5231 discr2 = Corresponding_Discriminant (discr2);
5234 Original_Record_Component (discr1) == Original_Record_Component (discr2);
5237 /* Return true if the array type specified by GNAT_TYPE and GNU_TYPE has
5238 a non-aliased component in the back-end sense. */
5241 array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type)
5243 /* If the type below this is a multi-array type, then
5244 this does not have aliased components. */
5245 if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
5246 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
5249 if (Has_Aliased_Components (gnat_type))
5252 return type_for_nonaliased_component_p (TREE_TYPE (gnu_type));
5255 /* Return true if GNAT_ADDRESS is a value known at compile-time. */
5258 compile_time_known_address_p (Node_Id gnat_address)
5260 /* Catch System'To_Address. */
5261 if (Nkind (gnat_address) == N_Unchecked_Type_Conversion)
5262 gnat_address = Expression (gnat_address);
5264 return Compile_Time_Known_Value (gnat_address);
5267 /* Given GNAT_ENTITY, elaborate all expressions that are required to
5268 be elaborated at the point of its definition, but do nothing else. */
5271 elaborate_entity (Entity_Id gnat_entity)
5273 switch (Ekind (gnat_entity))
5275 case E_Signed_Integer_Subtype:
5276 case E_Modular_Integer_Subtype:
5277 case E_Enumeration_Subtype:
5278 case E_Ordinary_Fixed_Point_Subtype:
5279 case E_Decimal_Fixed_Point_Subtype:
5280 case E_Floating_Point_Subtype:
5282 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
5283 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
5285 /* ??? Tests to avoid Constraint_Error in static expressions
5286 are needed until after the front stops generating bogus
5287 conversions on bounds of real types. */
5288 if (!Raises_Constraint_Error (gnat_lb))
5289 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
5290 true, false, Needs_Debug_Info (gnat_entity));
5291 if (!Raises_Constraint_Error (gnat_hb))
5292 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
5293 true, false, Needs_Debug_Info (gnat_entity));
5299 Node_Id full_definition = Declaration_Node (gnat_entity);
5300 Node_Id record_definition = Type_Definition (full_definition);
5302 /* If this is a record extension, go a level further to find the
5303 record definition. */
5304 if (Nkind (record_definition) == N_Derived_Type_Definition)
5305 record_definition = Record_Extension_Part (record_definition);
5309 case E_Record_Subtype:
5310 case E_Private_Subtype:
5311 case E_Limited_Private_Subtype:
5312 case E_Record_Subtype_With_Private:
5313 if (Is_Constrained (gnat_entity)
5314 && Has_Discriminants (gnat_entity)
5315 && Present (Discriminant_Constraint (gnat_entity)))
5317 Node_Id gnat_discriminant_expr;
5318 Entity_Id gnat_field;
5321 = First_Discriminant (Implementation_Base_Type (gnat_entity)),
5322 gnat_discriminant_expr
5323 = First_Elmt (Discriminant_Constraint (gnat_entity));
5324 Present (gnat_field);
5325 gnat_field = Next_Discriminant (gnat_field),
5326 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
5327 /* ??? For now, ignore access discriminants. */
5328 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
5329 elaborate_expression (Node (gnat_discriminant_expr),
5330 gnat_entity, get_entity_name (gnat_field),
5331 true, false, false);
5338 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
5339 any entities on its entity chain similarly. */
5342 mark_out_of_scope (Entity_Id gnat_entity)
5344 Entity_Id gnat_sub_entity;
5345 unsigned int kind = Ekind (gnat_entity);
5347 /* If this has an entity list, process all in the list. */
5348 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
5349 || IN (kind, Private_Kind)
5350 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
5351 || kind == E_Function || kind == E_Generic_Function
5352 || kind == E_Generic_Package || kind == E_Generic_Procedure
5353 || kind == E_Loop || kind == E_Operator || kind == E_Package
5354 || kind == E_Package_Body || kind == E_Procedure
5355 || kind == E_Record_Type || kind == E_Record_Subtype
5356 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
5357 for (gnat_sub_entity = First_Entity (gnat_entity);
5358 Present (gnat_sub_entity);
5359 gnat_sub_entity = Next_Entity (gnat_sub_entity))
5360 if (Scope (gnat_sub_entity) == gnat_entity
5361 && gnat_sub_entity != gnat_entity)
5362 mark_out_of_scope (gnat_sub_entity);
5364 /* Now clear this if it has been defined, but only do so if it isn't
5365 a subprogram or parameter. We could refine this, but it isn't
5366 worth it. If this is statically allocated, it is supposed to
5367 hang around out of cope. */
5368 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
5369 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
5371 save_gnu_tree (gnat_entity, NULL_TREE, true);
5372 save_gnu_tree (gnat_entity, error_mark_node, true);
5376 /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
5377 If this is a multi-dimensional array type, do this recursively.
5380 - ALIAS_SET_COPY: the new set is made a copy of the old one.
5381 - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
5382 - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */
5385 relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
5387 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
5388 of a one-dimensional array, since the padding has the same alias set
5389 as the field type, but if it's a multi-dimensional array, we need to
5390 see the inner types. */
5391 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
5392 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
5393 || TYPE_IS_PADDING_P (gnu_old_type)))
5394 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
5396 /* Unconstrained array types are deemed incomplete and would thus be given
5397 alias set 0. Retrieve the underlying array type. */
5398 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
5400 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
5401 if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE)
5403 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type))));
5405 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
5406 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
5407 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
5408 relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op);
5412 case ALIAS_SET_COPY:
5413 /* The alias set shouldn't be copied between array types with different
5414 aliasing settings because this can break the aliasing relationship
5415 between the array type and its element type. */
5416 #ifndef ENABLE_CHECKING
5417 if (flag_strict_aliasing)
5419 gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE
5420 && TREE_CODE (gnu_old_type) == ARRAY_TYPE
5421 && TYPE_NONALIASED_COMPONENT (gnu_new_type)
5422 != TYPE_NONALIASED_COMPONENT (gnu_old_type)));
5424 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
5427 case ALIAS_SET_SUBSET:
5428 case ALIAS_SET_SUPERSET:
5430 alias_set_type old_set = get_alias_set (gnu_old_type);
5431 alias_set_type new_set = get_alias_set (gnu_new_type);
5433 /* Do nothing if the alias sets conflict. This ensures that we
5434 never call record_alias_subset several times for the same pair
5435 or at all for alias set 0. */
5436 if (!alias_sets_conflict_p (old_set, new_set))
5438 if (op == ALIAS_SET_SUBSET)
5439 record_alias_subset (old_set, new_set);
5441 record_alias_subset (new_set, old_set);
5450 record_component_aliases (gnu_new_type);
5453 /* Return a TREE_LIST describing the substitutions needed to reflect the
5454 discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can
5455 be in any order. TREE_PURPOSE gives the tree for the discriminant and
5456 TREE_VALUE is the replacement value. They are in the form of operands
5457 to substitute_in_expr. DEFINITION is true if this is for a definition
5461 build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition)
5463 tree gnu_list = NULL_TREE;
5464 Entity_Id gnat_discrim;
5467 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
5468 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
5469 Present (gnat_discrim);
5470 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
5471 gnat_value = Next_Elmt (gnat_value))
5472 /* Ignore access discriminants. */
5473 if (!Is_Access_Type (Etype (Node (gnat_value))))
5474 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
5475 elaborate_expression
5476 (Node (gnat_value), gnat_subtype,
5477 get_entity_name (gnat_discrim), definition,
5484 /* Return true if the size represented by GNU_SIZE can be handled by an
5485 allocation. If STATIC_P is true, consider only what can be done with a
5486 static allocation. */
5489 allocatable_size_p (tree gnu_size, bool static_p)
5491 HOST_WIDE_INT our_size;
5493 /* If this is not a static allocation, the only case we want to forbid
5494 is an overflowing size. That will be converted into a raise a
5497 return !(TREE_CODE (gnu_size) == INTEGER_CST
5498 && TREE_OVERFLOW (gnu_size));
5500 /* Otherwise, we need to deal with both variable sizes and constant
5501 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
5502 since assemblers may not like very large sizes. */
5503 if (!host_integerp (gnu_size, 1))
5506 our_size = tree_low_cst (gnu_size, 1);
5507 return (int) our_size == our_size;
5510 /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE,
5511 NAME, ARGS and ERROR_POINT. */
5514 prepend_one_attribute_to (struct attrib ** attr_list,
5515 enum attr_type attr_type,
5518 Node_Id attr_error_point)
5520 struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib));
5522 attr->type = attr_type;
5523 attr->name = attr_name;
5524 attr->args = attr_args;
5525 attr->error_point = attr_error_point;
5527 attr->next = *attr_list;
5531 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
5534 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
5538 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
5539 gnat_temp = Next_Rep_Item (gnat_temp))
5540 if (Nkind (gnat_temp) == N_Pragma)
5542 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
5543 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
5544 enum attr_type etype;
5546 if (Present (gnat_assoc) && Present (First (gnat_assoc))
5547 && Present (Next (First (gnat_assoc)))
5548 && (Nkind (Expression (Next (First (gnat_assoc))))
5549 == N_String_Literal))
5551 gnu_arg0 = get_identifier (TREE_STRING_POINTER
5554 (First (gnat_assoc))))));
5555 if (Present (Next (Next (First (gnat_assoc))))
5556 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
5557 == N_String_Literal))
5558 gnu_arg1 = get_identifier (TREE_STRING_POINTER
5562 (First (gnat_assoc)))))));
5565 switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp))))
5567 case Pragma_Machine_Attribute:
5568 etype = ATTR_MACHINE_ATTRIBUTE;
5571 case Pragma_Linker_Alias:
5572 etype = ATTR_LINK_ALIAS;
5575 case Pragma_Linker_Section:
5576 etype = ATTR_LINK_SECTION;
5579 case Pragma_Linker_Constructor:
5580 etype = ATTR_LINK_CONSTRUCTOR;
5583 case Pragma_Linker_Destructor:
5584 etype = ATTR_LINK_DESTRUCTOR;
5587 case Pragma_Weak_External:
5588 etype = ATTR_WEAK_EXTERNAL;
5591 case Pragma_Thread_Local_Storage:
5592 etype = ATTR_THREAD_LOCAL_STORAGE;
5600 /* Prepend to the list now. Make a list of the argument we might
5601 have, as GCC expects it. */
5602 prepend_one_attribute_to
5605 (gnu_arg1 != NULL_TREE)
5606 ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE,
5607 Present (Next (First (gnat_assoc)))
5608 ? Expression (Next (First (gnat_assoc))) : gnat_temp);
5612 /* Called when we need to protect a variable object using a SAVE_EXPR. */
5615 maybe_variable (tree gnu_operand)
5617 if (TREE_CONSTANT (gnu_operand)
5618 || TREE_READONLY (gnu_operand)
5619 || TREE_CODE (gnu_operand) == SAVE_EXPR
5620 || TREE_CODE (gnu_operand) == NULL_EXPR)
5623 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
5626 = build1 (UNCONSTRAINED_ARRAY_REF, TREE_TYPE (gnu_operand),
5627 variable_size (TREE_OPERAND (gnu_operand, 0)));
5629 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
5630 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
5634 return variable_size (gnu_operand);
5637 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
5638 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
5639 return the GCC tree to use for that expression. GNU_NAME is the suffix
5640 to use if a variable needs to be created and DEFINITION is true if this
5641 is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result;
5642 otherwise, we are just elaborating the expression for side-effects. If
5643 NEED_DEBUG is true, we need a variable for debugging purposes even if it
5644 isn't needed for code generation. */
5647 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name,
5648 bool definition, bool need_value, bool need_debug)
5652 /* If we already elaborated this expression (e.g. it was involved
5653 in the definition of a private type), use the old value. */
5654 if (present_gnu_tree (gnat_expr))
5655 return get_gnu_tree (gnat_expr);
5657 /* If we don't need a value and this is static or a discriminant,
5658 we don't need to do anything. */
5660 && (Is_OK_Static_Expression (gnat_expr)
5661 || (Nkind (gnat_expr) == N_Identifier
5662 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
5665 /* If it's a static expression, we don't need a variable for debugging. */
5666 if (need_debug && Is_OK_Static_Expression (gnat_expr))
5669 /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */
5670 gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity,
5671 gnu_name, definition, need_debug);
5673 /* Save the expression in case we try to elaborate this entity again. Since
5674 it's not a DECL, don't check it. Don't save if it's a discriminant. */
5675 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
5676 save_gnu_tree (gnat_expr, gnu_expr, true);
5678 return need_value ? gnu_expr : error_mark_node;
5681 /* Similar, but take a GNU expression and always return a result. */
5684 elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name,
5685 bool definition, bool need_debug)
5687 /* Skip any conversions and simple arithmetics to see if the expression
5688 is a read-only variable.
5689 ??? This really should remain read-only, but we have to think about
5690 the typing of the tree here. */
5692 = skip_simple_arithmetic (remove_conversions (gnu_expr, true));
5693 tree gnu_decl = NULL_TREE;
5694 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
5697 /* In most cases, we won't see a naked FIELD_DECL because a discriminant
5698 reference will have been replaced with a COMPONENT_REF when the type
5699 is being elaborated. However, there are some cases involving child
5700 types where we will. So convert it to a COMPONENT_REF. We hope it
5701 will be at the highest level of the expression in these cases. */
5702 if (TREE_CODE (gnu_expr) == FIELD_DECL)
5703 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
5704 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
5705 gnu_expr, NULL_TREE);
5707 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
5708 that is read-only, make a variable that is initialized to contain the
5709 bound when the package containing the definition is elaborated. If
5710 this entity is defined at top level and a bound or discriminant value
5711 isn't a constant or a reference to a discriminant, replace the bound
5712 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
5713 rely here on the fact that an expression cannot contain both the
5714 discriminant and some other variable. */
5715 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
5716 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
5717 && (TREE_READONLY (gnu_inner_expr)
5718 || DECL_READONLY_ONCE_ELAB (gnu_inner_expr)))
5719 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
5721 /* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */
5722 if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr))
5725 /* Now create the variable if we need it. */
5726 if (need_debug || (expr_variable && expr_global))
5728 = create_var_decl (create_concat_name (gnat_entity,
5729 IDENTIFIER_POINTER (gnu_name)),
5730 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
5731 !need_debug, Is_Public (gnat_entity),
5732 !definition, false, NULL, gnat_entity);
5734 /* We only need to use this variable if we are in global context since GCC
5735 can do the right thing in the local case. */
5736 if (expr_global && expr_variable)
5739 return expr_variable ? maybe_variable (gnu_expr) : gnu_expr;
5742 /* Create a record type that contains a SIZE bytes long field of TYPE with a
5743 starting bit position so that it is aligned to ALIGN bits, and leaving at
5744 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
5745 record is guaranteed to get. */
5748 make_aligning_type (tree type, unsigned int align, tree size,
5749 unsigned int base_align, int room)
5751 /* We will be crafting a record type with one field at a position set to be
5752 the next multiple of ALIGN past record'address + room bytes. We use a
5753 record placeholder to express record'address. */
5755 tree record_type = make_node (RECORD_TYPE);
5756 tree record = build0 (PLACEHOLDER_EXPR, record_type);
5759 = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));
5761 /* The diagram below summarizes the shape of what we manipulate:
5763 <--------- pos ---------->
5764 { +------------+-------------+-----------------+
5765 record =>{ |############| ... | field (type) |
5766 { +------------+-------------+-----------------+
5767 |<-- room -->|<- voffset ->|<---- size ----->|
5770 record_addr vblock_addr
5772 Every length is in sizetype bytes there, except "pos" which has to be
5773 set as a bit position in the GCC tree for the record. */
5775 tree room_st = size_int (room);
5776 tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
5777 tree voffset_st, pos, field;
5779 tree name = TYPE_NAME (type);
5781 if (TREE_CODE (name) == TYPE_DECL)
5782 name = DECL_NAME (name);
5784 TYPE_NAME (record_type) = concat_name (name, "_ALIGN");
5786 /* Compute VOFFSET and then POS. The next byte position multiple of some
5787 alignment after some address is obtained by "and"ing the alignment minus
5788 1 with the two's complement of the address. */
5790 voffset_st = size_binop (BIT_AND_EXPR,
5791 size_diffop (size_zero_node, vblock_addr_st),
5792 ssize_int ((align / BITS_PER_UNIT) - 1));
5794 /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */
5796 pos = size_binop (MULT_EXPR,
5797 convert (bitsizetype,
5798 size_binop (PLUS_EXPR, room_st, voffset_st)),
5801 /* Craft the GCC record representation. We exceptionally do everything
5802 manually here because 1) our generic circuitry is not quite ready to
5803 handle the complex position/size expressions we are setting up, 2) we
5804 have a strong simplifying factor at hand: we know the maximum possible
5805 value of voffset, and 3) we have to set/reset at least the sizes in
5806 accordance with this maximum value anyway, as we need them to convey
5807 what should be "alloc"ated for this type.
5809 Use -1 as the 'addressable' indication for the field to prevent the
5810 creation of a bitfield. We don't need one, it would have damaging
5811 consequences on the alignment computation, and create_field_decl would
5812 make one without this special argument, for instance because of the
5813 complex position expression. */
5815 field = create_field_decl (get_identifier ("F"), type, record_type,
5817 TYPE_FIELDS (record_type) = field;
5819 TYPE_ALIGN (record_type) = base_align;
5820 TYPE_USER_ALIGN (record_type) = 1;
5822 TYPE_SIZE (record_type)
5823 = size_binop (PLUS_EXPR,
5824 size_binop (MULT_EXPR, convert (bitsizetype, size),
5826 bitsize_int (align + room * BITS_PER_UNIT));
5827 TYPE_SIZE_UNIT (record_type)
5828 = size_binop (PLUS_EXPR, size,
5829 size_int (room + align / BITS_PER_UNIT));
5831 SET_TYPE_MODE (record_type, BLKmode);
5833 relate_alias_sets (record_type, type, ALIAS_SET_COPY);
5837 /* Return the result of rounding T up to ALIGN. */
5839 static inline unsigned HOST_WIDE_INT
5840 round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align)
5848 /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
5849 as the field type of a packed record if IN_RECORD is true, or as the
5850 component type of a packed array if IN_RECORD is false. See if we can
5851 rewrite it either as a type that has a non-BLKmode, which we can pack
5852 tighter in the packed record case, or as a smaller type. If so, return
5853 the new type. If not, return the original type. */
5856 make_packable_type (tree type, bool in_record)
5858 unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1);
5859 unsigned HOST_WIDE_INT new_size;
5860 tree new_type, old_field, field_list = NULL_TREE;
5862 /* No point in doing anything if the size is zero. */
5866 new_type = make_node (TREE_CODE (type));
5868 /* Copy the name and flags from the old type to that of the new.
5869 Note that we rely on the pointer equality created here for
5870 TYPE_NAME to look through conversions in various places. */
5871 TYPE_NAME (new_type) = TYPE_NAME (type);
5872 TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
5873 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
5874 if (TREE_CODE (type) == RECORD_TYPE)
5875 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
5877 /* If we are in a record and have a small size, set the alignment to
5878 try for an integral mode. Otherwise set it to try for a smaller
5879 type with BLKmode. */
5880 if (in_record && size <= MAX_FIXED_MODE_SIZE)
5882 TYPE_ALIGN (new_type) = ceil_alignment (size);
5883 new_size = round_up_to_align (size, TYPE_ALIGN (new_type));
5887 unsigned HOST_WIDE_INT align;
5889 /* Do not try to shrink the size if the RM size is not constant. */
5890 if (TYPE_CONTAINS_TEMPLATE_P (type)
5891 || !host_integerp (TYPE_ADA_SIZE (type), 1))
5894 /* Round the RM size up to a unit boundary to get the minimal size
5895 for a BLKmode record. Give up if it's already the size. */
5896 new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type));
5897 new_size = round_up_to_align (new_size, BITS_PER_UNIT);
5898 if (new_size == size)
5901 align = new_size & -new_size;
5902 TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
5905 TYPE_USER_ALIGN (new_type) = 1;
5907 /* Now copy the fields, keeping the position and size as we don't want
5908 to change the layout by propagating the packedness downwards. */
5909 for (old_field = TYPE_FIELDS (type); old_field;
5910 old_field = TREE_CHAIN (old_field))
5912 tree new_field_type = TREE_TYPE (old_field);
5913 tree new_field, new_size;
5915 if ((TREE_CODE (new_field_type) == RECORD_TYPE
5916 || TREE_CODE (new_field_type) == UNION_TYPE
5917 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5918 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5919 && host_integerp (TYPE_SIZE (new_field_type), 1))
5920 new_field_type = make_packable_type (new_field_type, true);
5922 /* However, for the last field in a not already packed record type
5923 that is of an aggregate type, we need to use the RM size in the
5924 packable version of the record type, see finish_record_type. */
5925 if (!TREE_CHAIN (old_field)
5926 && !TYPE_PACKED (type)
5927 && (TREE_CODE (new_field_type) == RECORD_TYPE
5928 || TREE_CODE (new_field_type) == UNION_TYPE
5929 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
5930 && !TYPE_IS_FAT_POINTER_P (new_field_type)
5931 && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
5932 && TYPE_ADA_SIZE (new_field_type))
5933 new_size = TYPE_ADA_SIZE (new_field_type);
5935 new_size = DECL_SIZE (old_field);
5937 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
5938 new_type, TYPE_PACKED (type), new_size,
5939 bit_position (old_field),
5940 !DECL_NONADDRESSABLE_P (old_field));
5942 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
5943 SET_DECL_ORIGINAL_FIELD
5944 (new_field, (DECL_ORIGINAL_FIELD (old_field)
5945 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
5947 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
5948 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
5950 TREE_CHAIN (new_field) = field_list;
5951 field_list = new_field;
5954 finish_record_type (new_type, nreverse (field_list), 2, true);
5955 relate_alias_sets (new_type, type, ALIAS_SET_COPY);
5957 /* If this is a padding record, we never want to make the size smaller
5958 than what was specified. For QUAL_UNION_TYPE, also copy the size. */
5959 if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
5960 || TREE_CODE (type) == QUAL_UNION_TYPE)
5962 TYPE_SIZE (new_type) = TYPE_SIZE (type);
5963 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
5967 TYPE_SIZE (new_type) = bitsize_int (new_size);
5968 TYPE_SIZE_UNIT (new_type)
5969 = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
5972 if (!TYPE_CONTAINS_TEMPLATE_P (type))
5973 SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));
5975 compute_record_mode (new_type);
5977 /* Try harder to get a packable type if necessary, for example
5978 in case the record itself contains a BLKmode field. */
5979 if (in_record && TYPE_MODE (new_type) == BLKmode)
5980 SET_TYPE_MODE (new_type,
5981 mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));
5983 /* If neither the mode nor the size has shrunk, return the old type. */
5984 if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
5990 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
5991 if needed. We have already verified that SIZE and TYPE are large enough.
5993 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
5996 IS_USER_TYPE is true if we must complete the original type.
5998 DEFINITION is true if this type is being defined.
6000 SAME_RM_SIZE is true if the RM size of the resulting type is to be set
6001 to SIZE too; otherwise, it's set to the RM size of the original type. */
6004 maybe_pad_type (tree type, tree size, unsigned int align,
6005 Entity_Id gnat_entity, const char *name_trailer,
6006 bool is_user_type, bool definition, bool same_rm_size)
6008 tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type);
6009 tree orig_size = TYPE_SIZE (type);
6010 unsigned int orig_align = align;
6013 /* If TYPE is a padded type, see if it agrees with any size and alignment
6014 we were given. If so, return the original type. Otherwise, strip
6015 off the padding, since we will either be returning the inner type
6016 or repadding it. If no size or alignment is specified, use that of
6017 the original padded type. */
6018 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
6021 || operand_equal_p (round_up (size,
6022 MAX (align, TYPE_ALIGN (type))),
6023 round_up (TYPE_SIZE (type),
6024 MAX (align, TYPE_ALIGN (type))),
6026 && (align == 0 || align == TYPE_ALIGN (type)))
6030 size = TYPE_SIZE (type);
6032 align = TYPE_ALIGN (type);
6034 type = TREE_TYPE (TYPE_FIELDS (type));
6035 orig_size = TYPE_SIZE (type);
6038 /* If the size is either not being changed or is being made smaller (which
6039 is not done here and is only valid for bitfields anyway), show the size
6040 isn't changing. Likewise, clear the alignment if it isn't being
6041 changed. Then return if we aren't doing anything. */
6043 && (operand_equal_p (size, orig_size, 0)
6044 || (TREE_CODE (orig_size) == INTEGER_CST
6045 && tree_int_cst_lt (size, orig_size))))
6048 if (align == TYPE_ALIGN (type))
6051 if (align == 0 && !size)
6054 /* If requested, complete the original type and give it a name. */
6056 create_type_decl (get_entity_name (gnat_entity), type,
6057 NULL, !Comes_From_Source (gnat_entity),
6059 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6060 && DECL_IGNORED_P (TYPE_NAME (type))),
6063 /* We used to modify the record in place in some cases, but that could
6064 generate incorrect debugging information. So make a new record
6066 record = make_node (RECORD_TYPE);
6067 TYPE_IS_PADDING_P (record) = 1;
6069 if (Present (gnat_entity))
6070 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
6072 TYPE_VOLATILE (record)
6073 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
6075 TYPE_ALIGN (record) = align;
6077 TYPE_USER_ALIGN (record) = align;
6079 TYPE_SIZE (record) = size ? size : orig_size;
6080 TYPE_SIZE_UNIT (record)
6081 = convert (sizetype,
6082 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
6083 bitsize_unit_node));
6085 /* If we are changing the alignment and the input type is a record with
6086 BLKmode and a small constant size, try to make a form that has an
6087 integral mode. This might allow the padding record to also have an
6088 integral mode, which will be much more efficient. There is no point
6089 in doing so if a size is specified unless it is also a small constant
6090 size and it is incorrect to do so if we cannot guarantee that the mode
6091 will be naturally aligned since the field must always be addressable.
6093 ??? This might not always be a win when done for a stand-alone object:
6094 since the nominal and the effective type of the object will now have
6095 different modes, a VIEW_CONVERT_EXPR will be required for converting
6096 between them and it might be hard to overcome afterwards, including
6097 at the RTL level when the stand-alone object is accessed as a whole. */
6099 && TREE_CODE (type) == RECORD_TYPE
6100 && TYPE_MODE (type) == BLKmode
6101 && TREE_CODE (orig_size) == INTEGER_CST
6102 && !TREE_OVERFLOW (orig_size)
6103 && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
6105 || (TREE_CODE (size) == INTEGER_CST
6106 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
6108 tree packable_type = make_packable_type (type, true);
6109 if (TYPE_MODE (packable_type) != BLKmode
6110 && align >= TYPE_ALIGN (packable_type))
6111 type = packable_type;
6114 /* Now create the field with the original size. */
6115 field = create_field_decl (get_identifier ("F"), type, record, 0,
6116 orig_size, bitsize_zero_node, 1);
6117 DECL_INTERNAL_P (field) = 1;
6119 /* Do not finalize it until after the auxiliary record is built. */
6120 finish_record_type (record, field, 1, true);
6122 /* Set the same size for its RM size if requested; otherwise reuse
6123 the RM size of the original type. */
6124 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size);
6126 /* Unless debugging information isn't being written for the input type,
6127 write a record that shows what we are a subtype of and also make a
6128 variable that indicates our size, if still variable. */
6129 if (TYPE_NAME (record)
6130 && AGGREGATE_TYPE_P (type)
6131 && TREE_CODE (orig_size) != INTEGER_CST
6132 && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
6133 && DECL_IGNORED_P (TYPE_NAME (type))))
6135 tree marker = make_node (RECORD_TYPE);
6136 tree name = TYPE_NAME (record);
6137 tree orig_name = TYPE_NAME (type);
6139 if (TREE_CODE (name) == TYPE_DECL)
6140 name = DECL_NAME (name);
6142 if (TREE_CODE (orig_name) == TYPE_DECL)
6143 orig_name = DECL_NAME (orig_name);
6145 TYPE_NAME (marker) = concat_name (name, "XVS");
6146 finish_record_type (marker,
6147 create_field_decl (orig_name, integer_type_node,
6148 marker, 0, NULL_TREE, NULL_TREE,
6152 add_parallel_type (TYPE_STUB_DECL (record), marker);
6154 if (size && TREE_CODE (size) != INTEGER_CST && definition)
6155 create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
6156 TYPE_SIZE_UNIT (record), false, false, false,
6157 false, NULL, gnat_entity);
6160 rest_of_record_type_compilation (record);
6162 /* If the size was widened explicitly, maybe give a warning. Take the
6163 original size as the maximum size of the input if there was an
6164 unconstrained record involved and round it up to the specified alignment,
6165 if one was specified. */
6166 if (CONTAINS_PLACEHOLDER_P (orig_size))
6167 orig_size = max_size (orig_size, true);
6170 orig_size = round_up (orig_size, align);
6172 if (size && Present (gnat_entity)
6173 && !operand_equal_p (size, orig_size, 0)
6174 && !(TREE_CODE (size) == INTEGER_CST
6175 && TREE_CODE (orig_size) == INTEGER_CST
6176 && tree_int_cst_lt (size, orig_size)))
6178 Node_Id gnat_error_node = Empty;
6180 if (Is_Packed_Array_Type (gnat_entity))
6181 gnat_entity = Original_Array_Type (gnat_entity);
6183 if ((Ekind (gnat_entity) == E_Component
6184 || Ekind (gnat_entity) == E_Discriminant)
6185 && Present (Component_Clause (gnat_entity)))
6186 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
6187 else if (Present (Size_Clause (gnat_entity)))
6188 gnat_error_node = Expression (Size_Clause (gnat_entity));
6190 /* Generate message only for entities that come from source, since
6191 if we have an entity created by expansion, the message will be
6192 generated for some other corresponding source entity. */
6193 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
6194 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
6196 size_diffop (size, orig_size));
6198 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
6199 post_error_ne_tree ("component of& padded{ by ^ bits}?",
6200 gnat_entity, gnat_entity,
6201 size_diffop (size, orig_size));
6207 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
6208 the value passed against the list of choices. */
6211 choices_to_gnu (tree operand, Node_Id choices)
6215 tree result = integer_zero_node;
6216 tree this_test, low = 0, high = 0, single = 0;
6218 for (choice = First (choices); Present (choice); choice = Next (choice))
6220 switch (Nkind (choice))
6223 low = gnat_to_gnu (Low_Bound (choice));
6224 high = gnat_to_gnu (High_Bound (choice));
6226 /* There's no good type to use here, so we might as well use
6227 integer_type_node. */
6229 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6230 build_binary_op (GE_EXPR, integer_type_node,
6232 build_binary_op (LE_EXPR, integer_type_node,
6237 case N_Subtype_Indication:
6238 gnat_temp = Range_Expression (Constraint (choice));
6239 low = gnat_to_gnu (Low_Bound (gnat_temp));
6240 high = gnat_to_gnu (High_Bound (gnat_temp));
6243 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6244 build_binary_op (GE_EXPR, integer_type_node,
6246 build_binary_op (LE_EXPR, integer_type_node,
6251 case N_Expanded_Name:
6252 /* This represents either a subtype range, an enumeration
6253 literal, or a constant Ekind says which. If an enumeration
6254 literal or constant, fall through to the next case. */
6255 if (Ekind (Entity (choice)) != E_Enumeration_Literal
6256 && Ekind (Entity (choice)) != E_Constant)
6258 tree type = gnat_to_gnu_type (Entity (choice));
6260 low = TYPE_MIN_VALUE (type);
6261 high = TYPE_MAX_VALUE (type);
6264 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
6265 build_binary_op (GE_EXPR, integer_type_node,
6267 build_binary_op (LE_EXPR, integer_type_node,
6272 /* ... fall through ... */
6274 case N_Character_Literal:
6275 case N_Integer_Literal:
6276 single = gnat_to_gnu (choice);
6277 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
6281 case N_Others_Choice:
6282 this_test = integer_one_node;
6289 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
6296 /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of
6297 type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */
6300 adjust_packed (tree field_type, tree record_type, int packed)
6302 /* If the field contains an item of variable size, we cannot pack it
6303 because we cannot create temporaries of non-fixed size in case
6304 we need to take the address of the field. See addressable_p and
6305 the notes on the addressability issues for further details. */
6306 if (is_variable_size (field_type))
6309 /* If the alignment of the record is specified and the field type
6310 is over-aligned, request Storage_Unit alignment for the field. */
6313 if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type))
6322 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
6323 placed in GNU_RECORD_TYPE.
6325 PACKED is 1 if the enclosing record is packed, -1 if the enclosing
6326 record has Component_Alignment of Storage_Unit, -2 if the enclosing
6327 record has a specified alignment.
6329 DEFINITION is true if this field is for a record being defined. */
6332 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
6335 tree gnu_field_id = get_entity_name (gnat_field);
6336 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
6337 tree gnu_field, gnu_size, gnu_pos;
6338 bool needs_strict_alignment
6339 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
6340 || Treat_As_Volatile (gnat_field));
6342 /* If this field requires strict alignment, we cannot pack it because
6343 it would very likely be under-aligned in the record. */
6344 if (needs_strict_alignment)
6347 packed = adjust_packed (gnu_field_type, gnu_record_type, packed);
6349 /* If a size is specified, use it. Otherwise, if the record type is packed,
6350 use the official RM size. See "Handling of Type'Size Values" in Einfo
6351 for further details. */
6352 if (Known_Static_Esize (gnat_field))
6353 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6354 gnat_field, FIELD_DECL, false, true);
6355 else if (packed == 1)
6356 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
6357 gnat_field, FIELD_DECL, false, true);
6359 gnu_size = NULL_TREE;
6361 /* If we have a specified size that's smaller than that of the field type,
6362 or a position is specified, and the field type is a record, see if we can
6363 get either an integral mode form of the type or a smaller form. If we
6364 can, show a size was specified for the field if there wasn't one already,
6365 so we know to make this a bitfield and avoid making things wider.
6367 Doing this is first useful if the record is packed because we may then
6368 place the field at a non-byte-aligned position and so achieve tighter
6371 This is in addition *required* if the field shares a byte with another
6372 field and the front-end lets the back-end handle the references, because
6373 GCC does not handle BLKmode bitfields properly.
6375 We avoid the transformation if it is not required or potentially useful,
6376 as it might entail an increase of the field's alignment and have ripple
6377 effects on the outer record type. A typical case is a field known to be
6378 byte aligned and not to share a byte with another field.
6380 Besides, we don't even look the possibility of a transformation in cases
6381 known to be in error already, for instance when an invalid size results
6382 from a component clause. */
6384 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6385 && !TYPE_IS_FAT_POINTER_P (gnu_field_type)
6386 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
6389 && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type))
6390 || Present (Component_Clause (gnat_field))))))
6392 /* See what the alternate type and size would be. */
6393 tree gnu_packable_type = make_packable_type (gnu_field_type, true);
6395 bool has_byte_aligned_clause
6396 = Present (Component_Clause (gnat_field))
6397 && (UI_To_Int (Component_Bit_Offset (gnat_field))
6398 % BITS_PER_UNIT == 0);
6400 /* Compute whether we should avoid the substitution. */
6402 /* There is no point substituting if there is no change... */
6403 = (gnu_packable_type == gnu_field_type)
6404 /* ... nor when the field is known to be byte aligned and not to
6405 share a byte with another field. */
6406 || (has_byte_aligned_clause
6407 && value_factor_p (gnu_size, BITS_PER_UNIT))
6408 /* The size of an aliased field must be an exact multiple of the
6409 type's alignment, which the substitution might increase. Reject
6410 substitutions that would so invalidate a component clause when the
6411 specified position is byte aligned, as the change would have no
6412 real benefit from the packing standpoint anyway. */
6413 || (Is_Aliased (gnat_field)
6414 && has_byte_aligned_clause
6415 && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type)));
6417 /* Substitute unless told otherwise. */
6420 gnu_field_type = gnu_packable_type;
6423 gnu_size = rm_size (gnu_field_type);
6427 /* If we are packing the record and the field is BLKmode, round the
6428 size up to a byte boundary. */
6429 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
6430 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
6432 if (Present (Component_Clause (gnat_field)))
6434 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
6435 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
6436 gnat_field, FIELD_DECL, false, true);
6438 /* Ensure the position does not overlap with the parent subtype,
6440 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
6443 = gnat_to_gnu_type (Parent_Subtype
6444 (Underlying_Type (Scope (gnat_field))));
6446 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
6447 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
6450 ("offset of& must be beyond parent{, minimum allowed is ^}",
6451 First_Bit (Component_Clause (gnat_field)), gnat_field,
6452 TYPE_SIZE_UNIT (gnu_parent));
6456 /* If this field needs strict alignment, ensure the record is
6457 sufficiently aligned and that that position and size are
6458 consistent with the alignment. */
6459 if (needs_strict_alignment)
6461 TYPE_ALIGN (gnu_record_type)
6462 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
6465 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
6467 if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
6469 ("atomic field& must be natural size of type{ (^)}",
6470 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6471 TYPE_SIZE (gnu_field_type));
6473 else if (Is_Aliased (gnat_field))
6475 ("size of aliased field& must be ^ bits",
6476 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6477 TYPE_SIZE (gnu_field_type));
6479 else if (Strict_Alignment (Etype (gnat_field)))
6481 ("size of & with aliased or tagged components not ^ bits",
6482 Last_Bit (Component_Clause (gnat_field)), gnat_field,
6483 TYPE_SIZE (gnu_field_type));
6485 gnu_size = NULL_TREE;
6488 if (!integer_zerop (size_binop
6489 (TRUNC_MOD_EXPR, gnu_pos,
6490 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
6492 if (Is_Aliased (gnat_field))
6494 ("position of aliased field& must be multiple of ^ bits",
6495 First_Bit (Component_Clause (gnat_field)), gnat_field,
6496 TYPE_ALIGN (gnu_field_type));
6498 else if (Treat_As_Volatile (gnat_field))
6500 ("position of volatile field& must be multiple of ^ bits",
6501 First_Bit (Component_Clause (gnat_field)), gnat_field,
6502 TYPE_ALIGN (gnu_field_type));
6504 else if (Strict_Alignment (Etype (gnat_field)))
6506 ("position of & with aliased or tagged components not multiple of ^ bits",
6507 First_Bit (Component_Clause (gnat_field)), gnat_field,
6508 TYPE_ALIGN (gnu_field_type));
6513 gnu_pos = NULL_TREE;
6517 if (Is_Atomic (gnat_field))
6518 check_ok_for_atomic (gnu_field_type, gnat_field, false);
6521 /* If the record has rep clauses and this is the tag field, make a rep
6522 clause for it as well. */
6523 else if (Has_Specified_Layout (Scope (gnat_field))
6524 && Chars (gnat_field) == Name_uTag)
6526 gnu_pos = bitsize_zero_node;
6527 gnu_size = TYPE_SIZE (gnu_field_type);
6531 gnu_pos = NULL_TREE;
6533 /* We need to make the size the maximum for the type if it is
6534 self-referential and an unconstrained type. In that case, we can't
6535 pack the field since we can't make a copy to align it. */
6536 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
6538 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
6539 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
6541 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
6545 /* If a size is specified, adjust the field's type to it. */
6548 /* If the field's type is justified modular, we would need to remove
6549 the wrapper to (better) meet the layout requirements. However we
6550 can do so only if the field is not aliased to preserve the unique
6551 layout and if the prescribed size is not greater than that of the
6552 packed array to preserve the justification. */
6553 if (!needs_strict_alignment
6554 && TREE_CODE (gnu_field_type) == RECORD_TYPE
6555 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
6556 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
6558 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
6561 = make_type_from_size (gnu_field_type, gnu_size,
6562 Has_Biased_Representation (gnat_field));
6563 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
6564 "PAD", false, definition, true);
6567 /* Otherwise (or if there was an error), don't specify a position. */
6569 gnu_pos = NULL_TREE;
6571 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
6572 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
6574 /* Now create the decl for the field. */
6575 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
6576 packed, gnu_size, gnu_pos,
6577 Is_Aliased (gnat_field));
6578 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
6579 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
6581 if (Ekind (gnat_field) == E_Discriminant)
6582 DECL_DISCRIMINANT_NUMBER (gnu_field)
6583 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
6588 /* Return true if TYPE is a type with variable size, a padding type with a
6589 field of variable size or is a record that has a field such a field. */
6592 is_variable_size (tree type)
6596 if (!TREE_CONSTANT (TYPE_SIZE (type)))
6599 if (TREE_CODE (type) == RECORD_TYPE
6600 && TYPE_IS_PADDING_P (type)
6601 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
6604 if (TREE_CODE (type) != RECORD_TYPE
6605 && TREE_CODE (type) != UNION_TYPE
6606 && TREE_CODE (type) != QUAL_UNION_TYPE)
6609 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6610 if (is_variable_size (TREE_TYPE (field)))
6616 /* qsort comparer for the bit positions of two record components. */
6619 compare_field_bitpos (const PTR rt1, const PTR rt2)
6621 const_tree const field1 = * (const_tree const *) rt1;
6622 const_tree const field2 = * (const_tree const *) rt2;
6624 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
6626 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
6629 /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set
6630 the result as the field list of GNU_RECORD_TYPE and finish it up. When
6631 called from gnat_to_gnu_entity during the processing of a record type
6632 definition, the GCC nodes for the discriminants and the parent, if any,
6633 will be on the GNU_FIELD_LIST. The other calls to this function are
6634 recursive calls for the component list of a variant and, in this case,
6635 GNU_FIELD_LIST is empty.
6637 PACKED is 1 if this is for a packed record, -1 if this is for a record
6638 with Component_Alignment of Storage_Unit, -2 if this is for a record
6639 with a specified alignment.
6641 DEFINITION is true if we are defining this record.
6643 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
6644 with a rep clause is to be added; in this case, that is all that should
6645 be done with such fields.
6647 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
6648 laying out the record. This means the alignment only serves to force
6649 fields to be bitfields, but not require the record to be that aligned.
6650 This is used for variants.
6652 ALL_REP, if true, means a rep clause was found for all the fields. This
6653 simplifies the logic since we know we're not in the mixed case.
6655 DO_NOT_FINALIZE, if true, means that the record type is expected to be
6656 modified afterwards so it will not be finalized here.
6658 UNCHECKED_UNION, if true, means that we are building a type for a record
6659 with a Pragma Unchecked_Union. */
6662 components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
6663 tree gnu_field_list, int packed, bool definition,
6664 tree *p_gnu_rep_list, bool cancel_alignment,
6665 bool all_rep, bool do_not_finalize, bool unchecked_union)
6667 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
6668 bool layout_with_rep = false;
6669 Node_Id component_decl, variant_part;
6670 tree gnu_our_rep_list = NULL_TREE;
6671 tree gnu_field, gnu_next, gnu_last;
6673 /* For each component referenced in a component declaration create a GCC
6674 field and add it to the list, skipping pragmas in the GNAT list. */
6675 if (Present (Component_Items (gnat_component_list)))
6677 = First_Non_Pragma (Component_Items (gnat_component_list));
6678 Present (component_decl);
6679 component_decl = Next_Non_Pragma (component_decl))
6681 Entity_Id gnat_field = Defining_Entity (component_decl);
6683 /* If present, the _Parent field must have been created and added
6684 as the last field to the list. */
6685 if (Chars (gnat_field) == Name_uParent)
6686 gnu_field = tree_last (gnu_field_list);
6689 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
6690 packed, definition);
6692 /* If this is the _Tag field, put it before any discriminants,
6693 instead of after them as is the case for all other fields. */
6694 if (Chars (gnat_field) == Name_uTag)
6695 gnu_field_list = chainon (gnu_field_list, gnu_field);
6698 TREE_CHAIN (gnu_field) = gnu_field_list;
6699 gnu_field_list = gnu_field;
6703 save_gnu_tree (gnat_field, gnu_field, false);
6706 /* At the end of the component list there may be a variant part. */
6707 variant_part = Variant_Part (gnat_component_list);
6709 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
6710 mutually exclusive and should go in the same memory. To do this we need
6711 to treat each variant as a record whose elements are created from the
6712 component list for the variant. So here we create the records from the
6713 lists for the variants and put them all into the QUAL_UNION_TYPE.
6714 If this is an Unchecked_Union, we make a UNION_TYPE instead or
6715 use GNU_RECORD_TYPE if there are no fields so far. */
6716 if (Present (variant_part))
6718 Node_Id gnat_discr = Name (variant_part), variant;
6719 tree gnu_discr = gnat_to_gnu (gnat_discr);
6720 tree gnu_name = TYPE_NAME (gnu_record_type);
6722 = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))),
6724 tree gnu_union_type, gnu_union_name, gnu_union_field;
6725 tree gnu_variant_list = NULL_TREE;
6727 if (TREE_CODE (gnu_name) == TYPE_DECL)
6728 gnu_name = DECL_NAME (gnu_name);
6731 = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
6733 /* Reuse an enclosing union if all fields are in the variant part
6734 and there is no representation clause on the record, to match
6735 the layout of C unions. There is an associated check below. */
6737 && TREE_CODE (gnu_record_type) == UNION_TYPE
6738 && !TYPE_PACKED (gnu_record_type))
6739 gnu_union_type = gnu_record_type;
6743 = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE);
6745 TYPE_NAME (gnu_union_type) = gnu_union_name;
6746 TYPE_ALIGN (gnu_union_type) = 0;
6747 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
6750 for (variant = First_Non_Pragma (Variants (variant_part));
6752 variant = Next_Non_Pragma (variant))
6754 tree gnu_variant_type = make_node (RECORD_TYPE);
6755 tree gnu_inner_name;
6758 Get_Variant_Encoding (variant);
6759 gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len);
6760 TYPE_NAME (gnu_variant_type)
6761 = concat_name (gnu_union_name,
6762 IDENTIFIER_POINTER (gnu_inner_name));
6764 /* Set the alignment of the inner type in case we need to make
6765 inner objects into bitfields, but then clear it out so the
6766 record actually gets only the alignment required. */
6767 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
6768 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
6770 /* Similarly, if the outer record has a size specified and all
6771 fields have record rep clauses, we can propagate the size
6772 into the variant part. */
6773 if (all_rep_and_size)
6775 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
6776 TYPE_SIZE_UNIT (gnu_variant_type)
6777 = TYPE_SIZE_UNIT (gnu_record_type);
6780 /* Add the fields into the record type for the variant. Note that we
6781 defer finalizing it until after we are sure to really use it. */
6782 components_to_record (gnu_variant_type, Component_List (variant),
6783 NULL_TREE, packed, definition,
6784 &gnu_our_rep_list, !all_rep_and_size, all_rep,
6785 true, unchecked_union);
6787 gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
6789 Set_Present_Expr (variant, annotate_value (gnu_qual));
6791 /* If this is an Unchecked_Union and we have exactly one field,
6792 use this field directly to match the layout of C unions. */
6794 && TYPE_FIELDS (gnu_variant_type)
6795 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type)))
6796 gnu_field = TYPE_FIELDS (gnu_variant_type);
6799 /* Deal with packedness like in gnat_to_gnu_field. */
6801 = adjust_packed (gnu_variant_type, gnu_record_type, packed);
6803 /* Finalize the record type now. We used to throw away
6804 empty records but we no longer do that because we need
6805 them to generate complete debug info for the variant;
6806 otherwise, the union type definition will be lacking
6807 the fields associated with these empty variants. */
6808 rest_of_record_type_compilation (gnu_variant_type);
6810 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
6811 gnu_union_type, field_packed,
6813 ? TYPE_SIZE (gnu_variant_type)
6816 ? bitsize_zero_node : 0),
6819 DECL_INTERNAL_P (gnu_field) = 1;
6821 if (!unchecked_union)
6822 DECL_QUALIFIER (gnu_field) = gnu_qual;
6825 TREE_CHAIN (gnu_field) = gnu_variant_list;
6826 gnu_variant_list = gnu_field;
6829 /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */
6830 if (gnu_variant_list)
6832 int union_field_packed;
6834 if (all_rep_and_size)
6836 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
6837 TYPE_SIZE_UNIT (gnu_union_type)
6838 = TYPE_SIZE_UNIT (gnu_record_type);
6841 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
6842 all_rep_and_size ? 1 : 0, false);
6844 /* If GNU_UNION_TYPE is our record type, it means we must have an
6845 Unchecked_Union with no fields. Verify that and, if so, just
6847 if (gnu_union_type == gnu_record_type)
6849 gcc_assert (unchecked_union
6851 && !gnu_our_rep_list);
6855 /* Deal with packedness like in gnat_to_gnu_field. */
6857 = adjust_packed (gnu_union_type, gnu_record_type, packed);
6860 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
6862 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
6863 all_rep ? bitsize_zero_node : 0, 0);
6865 DECL_INTERNAL_P (gnu_union_field) = 1;
6866 TREE_CHAIN (gnu_union_field) = gnu_field_list;
6867 gnu_field_list = gnu_union_field;
6871 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
6872 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do
6873 this in a separate pass since we want to handle the discriminants but
6874 can't play with them until we've used them in debugging data above.
6876 ??? If we then reorder them, debugging information will be wrong but
6877 there's nothing that can be done about this at the moment. */
6878 gnu_last = NULL_TREE;
6879 for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next)
6881 gnu_next = TREE_CHAIN (gnu_field);
6883 if (DECL_FIELD_OFFSET (gnu_field))
6886 gnu_field_list = gnu_next;
6888 TREE_CHAIN (gnu_last) = gnu_next;
6890 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
6891 gnu_our_rep_list = gnu_field;
6894 gnu_last = gnu_field;
6897 /* If we have any fields in our rep'ed field list and it is not the case that
6898 all the fields in the record have rep clauses and P_REP_LIST is nonzero,
6899 set it and ignore these fields. */
6900 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
6901 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
6903 /* Otherwise, sort the fields by bit position and put them into their own
6904 record, before the others, if we also have fields without rep clauses. */
6905 else if (gnu_our_rep_list)
6908 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
6909 int i, len = list_length (gnu_our_rep_list);
6910 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
6912 for (gnu_field = gnu_our_rep_list, i = 0;
6914 gnu_field = TREE_CHAIN (gnu_field), i++)
6915 gnu_arr[i] = gnu_field;
6917 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
6919 /* Put the fields in the list in order of increasing position, which
6920 means we start from the end. */
6921 gnu_our_rep_list = NULL_TREE;
6922 for (i = len - 1; i >= 0; i--)
6924 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
6925 gnu_our_rep_list = gnu_arr[i];
6926 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
6931 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
6933 = create_field_decl (get_identifier ("REP"), gnu_rep_type,
6934 gnu_record_type, 0, NULL_TREE, NULL_TREE, 1);
6935 DECL_INTERNAL_P (gnu_field) = 1;
6936 gnu_field_list = chainon (gnu_field_list, gnu_field);
6940 layout_with_rep = true;
6941 gnu_field_list = nreverse (gnu_our_rep_list);
6945 if (cancel_alignment)
6946 TYPE_ALIGN (gnu_record_type) = 0;
6948 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
6949 layout_with_rep ? 1 : 0, do_not_finalize);
6952 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
6953 placed into an Esize, Component_Bit_Offset, or Component_Size value
6954 in the GNAT tree. */
6957 annotate_value (tree gnu_size)
6959 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
6961 Node_Ref_Or_Val ops[3], ret;
6964 struct tree_int_map **h = NULL;
6966 /* See if we've already saved the value for this node. */
6967 if (EXPR_P (gnu_size))
6969 struct tree_int_map in;
6970 if (!annotate_value_cache)
6971 annotate_value_cache = htab_create_ggc (512, tree_int_map_hash,
6972 tree_int_map_eq, 0);
6973 in.base.from = gnu_size;
6974 h = (struct tree_int_map **)
6975 htab_find_slot (annotate_value_cache, &in, INSERT);
6978 return (Node_Ref_Or_Val) (*h)->to;
6981 /* If we do not return inside this switch, TCODE will be set to the
6982 code to use for a Create_Node operand and LEN (set above) will be
6983 the number of recursive calls for us to make. */
6985 switch (TREE_CODE (gnu_size))
6988 if (TREE_OVERFLOW (gnu_size))
6991 /* This may have come from a conversion from some smaller type,
6992 so ensure this is in bitsizetype. */
6993 gnu_size = convert (bitsizetype, gnu_size);
6995 /* For negative values, use NEGATE_EXPR of the supplied value. */
6996 if (tree_int_cst_sgn (gnu_size) < 0)
6998 /* The ridiculous code below is to handle the case of the largest
6999 negative integer. */
7000 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
7001 bool adjust = false;
7004 if (TREE_OVERFLOW (negative_size))
7007 = size_binop (MINUS_EXPR, bitsize_zero_node,
7008 size_binop (PLUS_EXPR, gnu_size,
7013 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
7015 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
7017 return annotate_value (temp);
7020 if (!host_integerp (gnu_size, 1))
7023 size = tree_low_cst (gnu_size, 1);
7025 /* This peculiar test is to make sure that the size fits in an int
7026 on machines where HOST_WIDE_INT is not "int". */
7027 if (tree_low_cst (gnu_size, 1) == size)
7028 return UI_From_Int (size);
7033 /* The only case we handle here is a simple discriminant reference. */
7034 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
7035 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
7036 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
7037 return Create_Node (Discrim_Val,
7038 annotate_value (DECL_DISCRIMINANT_NUMBER
7039 (TREE_OPERAND (gnu_size, 1))),
7044 CASE_CONVERT: case NON_LVALUE_EXPR:
7045 return annotate_value (TREE_OPERAND (gnu_size, 0));
7047 /* Now just list the operations we handle. */
7048 case COND_EXPR: tcode = Cond_Expr; break;
7049 case PLUS_EXPR: tcode = Plus_Expr; break;
7050 case MINUS_EXPR: tcode = Minus_Expr; break;
7051 case MULT_EXPR: tcode = Mult_Expr; break;
7052 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
7053 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
7054 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
7055 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
7056 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
7057 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
7058 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
7059 case NEGATE_EXPR: tcode = Negate_Expr; break;
7060 case MIN_EXPR: tcode = Min_Expr; break;
7061 case MAX_EXPR: tcode = Max_Expr; break;
7062 case ABS_EXPR: tcode = Abs_Expr; break;
7063 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
7064 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
7065 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
7066 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
7067 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
7068 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
7069 case BIT_AND_EXPR: tcode = Bit_And_Expr; break;
7070 case LT_EXPR: tcode = Lt_Expr; break;
7071 case LE_EXPR: tcode = Le_Expr; break;
7072 case GT_EXPR: tcode = Gt_Expr; break;
7073 case GE_EXPR: tcode = Ge_Expr; break;
7074 case EQ_EXPR: tcode = Eq_Expr; break;
7075 case NE_EXPR: tcode = Ne_Expr; break;
7081 /* Now get each of the operands that's relevant for this code. If any
7082 cannot be expressed as a repinfo node, say we can't. */
7083 for (i = 0; i < 3; i++)
7086 for (i = 0; i < len; i++)
7088 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
7089 if (ops[i] == No_Uint)
7093 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
7095 /* Save the result in the cache. */
7098 *h = GGC_NEW (struct tree_int_map);
7099 (*h)->base.from = gnu_size;
7106 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
7107 GCC type, set Component_Bit_Offset and Esize to the position and size
7111 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
7115 Entity_Id gnat_field;
7117 /* We operate by first making a list of all fields and their positions
7118 (we can get the sizes easily at any time) by a recursive call
7119 and then update all the sizes into the tree. */
7120 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
7121 size_zero_node, bitsize_zero_node,
7124 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
7125 gnat_field = Next_Entity (gnat_field))
7126 if ((Ekind (gnat_field) == E_Component
7127 || (Ekind (gnat_field) == E_Discriminant
7128 && !Is_Unchecked_Union (Scope (gnat_field)))))
7130 tree parent_offset = bitsize_zero_node;
7132 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
7137 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
7139 /* In this mode the tag and parent components have not been
7140 generated, so we add the appropriate offset to each
7141 component. For a component appearing in the current
7142 extension, the offset is the size of the parent. */
7143 if (Is_Derived_Type (gnat_entity)
7144 && Original_Record_Component (gnat_field) == gnat_field)
7146 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
7149 parent_offset = bitsize_int (POINTER_SIZE);
7152 Set_Component_Bit_Offset
7155 (size_binop (PLUS_EXPR,
7156 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
7157 TREE_VALUE (TREE_VALUE
7158 (TREE_VALUE (gnu_entry)))),
7161 Set_Esize (gnat_field,
7162 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
7164 else if (Is_Tagged_Type (gnat_entity)
7165 && Is_Derived_Type (gnat_entity))
7167 /* If there is no gnu_entry, this is an inherited component whose
7168 position is the same as in the parent type. */
7169 Set_Component_Bit_Offset
7171 Component_Bit_Offset (Original_Record_Component (gnat_field)));
7172 Set_Esize (gnat_field,
7173 Esize (Original_Record_Component (gnat_field)));
7178 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
7179 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
7180 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
7181 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
7182 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
7183 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
7187 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
7188 tree gnu_bitpos, unsigned int offset_align)
7191 tree gnu_result = gnu_list;
7193 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
7194 gnu_field = TREE_CHAIN (gnu_field))
7196 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
7197 DECL_FIELD_BIT_OFFSET (gnu_field));
7198 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
7199 DECL_FIELD_OFFSET (gnu_field));
7200 unsigned int our_offset_align
7201 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
7204 = tree_cons (gnu_field,
7205 tree_cons (gnu_our_offset,
7206 tree_cons (size_int (our_offset_align),
7207 gnu_our_bitpos, NULL_TREE),
7211 if (DECL_INTERNAL_P (gnu_field))
7213 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
7214 gnu_our_offset, gnu_our_bitpos,
7221 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
7222 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
7223 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
7224 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
7225 for the size of a field. COMPONENT_P is true if we are being called
7226 to process the Component_Size of GNAT_OBJECT. This is used for error
7227 message handling and to indicate to use the object size of GNU_TYPE.
7228 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
7229 it means that a size of zero should be treated as an unspecified size. */
7232 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
7233 enum tree_code kind, bool component_p, bool zero_ok)
7235 Node_Id gnat_error_node;
7236 tree type_size, size;
7238 if (kind == VAR_DECL
7239 /* If a type needs strict alignment, a component of this type in
7240 a packed record cannot be packed and thus uses the type size. */
7241 || (kind == TYPE_DECL && Strict_Alignment (gnat_object)))
7242 type_size = TYPE_SIZE (gnu_type);
7244 type_size = rm_size (gnu_type);
7246 /* Find the node to use for errors. */
7247 if ((Ekind (gnat_object) == E_Component
7248 || Ekind (gnat_object) == E_Discriminant)
7249 && Present (Component_Clause (gnat_object)))
7250 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
7251 else if (Present (Size_Clause (gnat_object)))
7252 gnat_error_node = Expression (Size_Clause (gnat_object));
7254 gnat_error_node = gnat_object;
7256 /* Return 0 if no size was specified, either because Esize was not Present
7257 or the specified size was zero. */
7258 if (No (uint_size) || uint_size == No_Uint)
7261 /* Get the size as a tree. Issue an error if a size was specified but
7262 cannot be represented in sizetype. */
7263 size = UI_To_gnu (uint_size, bitsizetype);
7264 if (TREE_OVERFLOW (size))
7266 post_error_ne (component_p ? "component size of & is too large"
7267 : "size of & is too large",
7268 gnat_error_node, gnat_object);
7272 /* Ignore a negative size since that corresponds to our back-annotation.
7273 Also ignore a zero size if it is not permitted. */
7274 if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
7277 /* The size of objects is always a multiple of a byte. */
7278 if (kind == VAR_DECL
7279 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
7282 post_error_ne ("component size for& is not a multiple of Storage_Unit",
7283 gnat_error_node, gnat_object);
7285 post_error_ne ("size for& is not a multiple of Storage_Unit",
7286 gnat_error_node, gnat_object);
7290 /* If this is an integral type or a packed array type, the front-end has
7291 verified the size, so we need not do it here (which would entail
7292 checking against the bounds). However, if this is an aliased object,
7293 it may not be smaller than the type of the object. */
7294 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
7295 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
7298 /* If the object is a record that contains a template, add the size of
7299 the template to the specified size. */
7300 if (TREE_CODE (gnu_type) == RECORD_TYPE
7301 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7302 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
7304 /* Modify the size of the type to be that of the maximum size if it has a
7306 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
7307 type_size = max_size (type_size, true);
7309 /* If this is an access type or a fat pointer, the minimum size is that given
7310 by the smallest integral mode that's valid for pointers. */
7311 if ((TREE_CODE (gnu_type) == POINTER_TYPE) || TYPE_FAT_POINTER_P (gnu_type))
7313 enum machine_mode p_mode;
7315 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
7316 !targetm.valid_pointer_mode (p_mode);
7317 p_mode = GET_MODE_WIDER_MODE (p_mode))
7320 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
7323 /* If the size of the object is a constant, the new size must not be
7325 if (TREE_CODE (type_size) != INTEGER_CST
7326 || TREE_OVERFLOW (type_size)
7327 || tree_int_cst_lt (size, type_size))
7331 ("component size for& too small{, minimum allowed is ^}",
7332 gnat_error_node, gnat_object, type_size);
7334 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
7335 gnat_error_node, gnat_object, type_size);
7337 if (kind == VAR_DECL && !component_p
7338 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
7339 && !tree_int_cst_lt (size, rm_size (gnu_type)))
7340 post_error_ne_tree_2
7341 ("\\size of ^ is not a multiple of alignment (^ bits)",
7342 gnat_error_node, gnat_object, rm_size (gnu_type),
7343 TYPE_ALIGN (gnu_type));
7345 else if (INTEGRAL_TYPE_P (gnu_type))
7346 post_error_ne ("\\size would be legal if & were not aliased!",
7347 gnat_error_node, gnat_object);
7355 /* Similarly, but both validate and process a value of RM size. This
7356 routine is only called for types. */
7359 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
7361 /* Only issue an error if a Value_Size clause was explicitly given.
7362 Otherwise, we'd be duplicating an error on the Size clause. */
7363 Node_Id gnat_attr_node
7364 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
7365 tree old_size = rm_size (gnu_type), size;
7367 /* Do nothing if no size was specified, either because RM size was not
7368 Present or if the specified size was zero. */
7369 if (No (uint_size) || uint_size == No_Uint)
7372 /* Get the size as a tree. Issue an error if a size was specified but
7373 cannot be represented in sizetype. */
7374 size = UI_To_gnu (uint_size, bitsizetype);
7375 if (TREE_OVERFLOW (size))
7377 if (Present (gnat_attr_node))
7378 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
7383 /* Ignore a negative size since that corresponds to our back-annotation.
7384 Also ignore a zero size unless a Value_Size clause exists, or a size
7385 clause exists, or this is an integer type, in which case the front-end
7386 will have always set it. */
7387 if (tree_int_cst_sgn (size) < 0
7388 || (integer_zerop (size)
7389 && No (gnat_attr_node)
7390 && !Has_Size_Clause (gnat_entity)
7391 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
7394 /* If the old size is self-referential, get the maximum size. */
7395 if (CONTAINS_PLACEHOLDER_P (old_size))
7396 old_size = max_size (old_size, true);
7398 /* If the size of the object is a constant, the new size must not be smaller
7399 (the front-end has verified this for scalar and packed array types). */
7400 if (TREE_CODE (old_size) != INTEGER_CST
7401 || TREE_OVERFLOW (old_size)
7402 || (AGGREGATE_TYPE_P (gnu_type)
7403 && !(TREE_CODE (gnu_type) == ARRAY_TYPE
7404 && TYPE_PACKED_ARRAY_TYPE_P (gnu_type))
7405 && !(TREE_CODE (gnu_type) == RECORD_TYPE
7406 && TYPE_IS_PADDING_P (gnu_type)
7407 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE
7408 && TYPE_PACKED_ARRAY_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_type))))
7409 && tree_int_cst_lt (size, old_size)))
7411 if (Present (gnat_attr_node))
7413 ("Value_Size for& too small{, minimum allowed is ^}",
7414 gnat_attr_node, gnat_entity, old_size);
7418 /* Otherwise, set the RM size proper for integral types... */
7419 if ((TREE_CODE (gnu_type) == INTEGER_TYPE
7420 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
7421 || (TREE_CODE (gnu_type) == ENUMERAL_TYPE
7422 || TREE_CODE (gnu_type) == BOOLEAN_TYPE))
7423 SET_TYPE_RM_SIZE (gnu_type, size);
7425 /* ...or the Ada size for record and union types. */
7426 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
7427 || TREE_CODE (gnu_type) == UNION_TYPE
7428 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7429 && !TYPE_IS_FAT_POINTER_P (gnu_type))
7430 SET_TYPE_ADA_SIZE (gnu_type, size);
7433 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
7434 If TYPE is the best type, return it. Otherwise, make a new type. We
7435 only support new integral and pointer types. FOR_BIASED is true if
7436 we are making a biased type. */
7439 make_type_from_size (tree type, tree size_tree, bool for_biased)
7441 unsigned HOST_WIDE_INT size;
7445 /* If size indicates an error, just return TYPE to avoid propagating
7446 the error. Likewise if it's too large to represent. */
7447 if (!size_tree || !host_integerp (size_tree, 1))
7450 size = tree_low_cst (size_tree, 1);
7452 switch (TREE_CODE (type))
7457 biased_p = (TREE_CODE (type) == INTEGER_TYPE
7458 && TYPE_BIASED_REPRESENTATION_P (type));
7460 /* Only do something if the type is not a packed array type and
7461 doesn't already have the proper size. */
7462 if (TYPE_PACKED_ARRAY_TYPE_P (type)
7463 || (TYPE_PRECISION (type) == size && biased_p == for_biased))
7466 biased_p |= for_biased;
7467 if (size > LONG_LONG_TYPE_SIZE)
7468 size = LONG_LONG_TYPE_SIZE;
7470 if (TYPE_UNSIGNED (type) || biased_p)
7471 new_type = make_unsigned_type (size);
7473 new_type = make_signed_type (size);
7474 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
7475 SET_TYPE_RM_MIN_VALUE (new_type,
7476 convert (TREE_TYPE (new_type),
7477 TYPE_MIN_VALUE (type)));
7478 SET_TYPE_RM_MAX_VALUE (new_type,
7479 convert (TREE_TYPE (new_type),
7480 TYPE_MAX_VALUE (type)));
7481 /* Propagate the name to avoid creating a fake subrange type. */
7482 if (TYPE_NAME (type))
7484 if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
7485 TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type));
7487 TYPE_NAME (new_type) = TYPE_NAME (type);
7489 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
7490 SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
7494 /* Do something if this is a fat pointer, in which case we
7495 may need to return the thin pointer. */
7496 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
7498 enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
7499 if (!targetm.valid_pointer_mode (p_mode))
7502 build_pointer_type_for_mode
7503 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
7509 /* Only do something if this is a thin pointer, in which case we
7510 may need to return the fat pointer. */
7511 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
7513 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
7523 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
7524 a type or object whose present alignment is ALIGN. If this alignment is
7525 valid, return it. Otherwise, give an error and return ALIGN. */
7528 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
7530 unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment ();
7531 unsigned int new_align;
7532 Node_Id gnat_error_node;
7534 /* Don't worry about checking alignment if alignment was not specified
7535 by the source program and we already posted an error for this entity. */
7536 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
7539 /* Post the error on the alignment clause if any. */
7540 if (Present (Alignment_Clause (gnat_entity)))
7541 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
7543 gnat_error_node = gnat_entity;
7545 /* Within GCC, an alignment is an integer, so we must make sure a value is
7546 specified that fits in that range. Also, there is an upper bound to
7547 alignments we can support/allow. */
7548 if (!UI_Is_In_Int_Range (alignment)
7549 || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment))
7550 post_error_ne_num ("largest supported alignment for& is ^",
7551 gnat_error_node, gnat_entity, max_allowed_alignment);
7552 else if (!(Present (Alignment_Clause (gnat_entity))
7553 && From_At_Mod (Alignment_Clause (gnat_entity)))
7554 && new_align * BITS_PER_UNIT < align)
7556 unsigned int double_align;
7557 bool is_capped_double, align_clause;
7559 /* If the default alignment of "double" or larger scalar types is
7560 specifically capped and the new alignment is above the cap, do
7561 not post an error and change the alignment only if there is an
7562 alignment clause; this makes it possible to have the associated
7563 GCC type overaligned by default for performance reasons. */
7564 if ((double_align = double_float_alignment) > 0)
7567 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7569 = is_double_float_or_array (gnat_type, &align_clause);
7571 else if ((double_align = double_scalar_alignment) > 0)
7574 = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity);
7576 = is_double_scalar_or_array (gnat_type, &align_clause);
7579 is_capped_double = align_clause = false;
7581 if (is_capped_double && new_align >= double_align)
7584 align = new_align * BITS_PER_UNIT;
7588 if (is_capped_double)
7589 align = double_align * BITS_PER_UNIT;
7591 post_error_ne_num ("alignment for& must be at least ^",
7592 gnat_error_node, gnat_entity,
7593 align / BITS_PER_UNIT);
7598 new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1);
7599 if (new_align > align)
7606 /* Return the smallest alignment not less than SIZE. */
7609 ceil_alignment (unsigned HOST_WIDE_INT size)
7611 return (unsigned int) 1 << (floor_log2 (size - 1) + 1);
7614 /* Verify that OBJECT, a type or decl, is something we can implement
7615 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
7616 if we require atomic components. */
7619 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
7621 Node_Id gnat_error_point = gnat_entity;
7623 enum machine_mode mode;
7627 /* There are three case of what OBJECT can be. It can be a type, in which
7628 case we take the size, alignment and mode from the type. It can be a
7629 declaration that was indirect, in which case the relevant values are
7630 that of the type being pointed to, or it can be a normal declaration,
7631 in which case the values are of the decl. The code below assumes that
7632 OBJECT is either a type or a decl. */
7633 if (TYPE_P (object))
7635 mode = TYPE_MODE (object);
7636 align = TYPE_ALIGN (object);
7637 size = TYPE_SIZE (object);
7639 else if (DECL_BY_REF_P (object))
7641 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
7642 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
7643 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
7647 mode = DECL_MODE (object);
7648 align = DECL_ALIGN (object);
7649 size = DECL_SIZE (object);
7652 /* Consider all floating-point types atomic and any types that that are
7653 represented by integers no wider than a machine word. */
7654 if (GET_MODE_CLASS (mode) == MODE_FLOAT
7655 || ((GET_MODE_CLASS (mode) == MODE_INT
7656 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
7657 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
7660 /* For the moment, also allow anything that has an alignment equal
7661 to its size and which is smaller than a word. */
7662 if (size && TREE_CODE (size) == INTEGER_CST
7663 && compare_tree_int (size, align) == 0
7664 && align <= BITS_PER_WORD)
7667 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
7668 gnat_node = Next_Rep_Item (gnat_node))
7670 if (!comp_p && Nkind (gnat_node) == N_Pragma
7671 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7673 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7674 else if (comp_p && Nkind (gnat_node) == N_Pragma
7675 && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))
7676 == Pragma_Atomic_Components))
7677 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
7681 post_error_ne ("atomic access to component of & cannot be guaranteed",
7682 gnat_error_point, gnat_entity);
7684 post_error_ne ("atomic access to & cannot be guaranteed",
7685 gnat_error_point, gnat_entity);
7688 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
7689 have compatible signatures so that a call using one type may be safely
7690 issued if the actual target function type is the other. Return 1 if it is
7691 the case, 0 otherwise, and post errors on the incompatibilities.
7693 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
7694 that calls to the subprogram will have arguments suitable for the later
7695 underlying builtin expansion. */
7698 compatible_signatures_p (tree ftype1, tree ftype2)
7700 /* As of now, we only perform very trivial tests and consider it's the
7701 programmer's responsibility to ensure the type correctness in the Ada
7702 declaration, as in the regular Import cases.
7704 Mismatches typically result in either error messages from the builtin
7705 expander, internal compiler errors, or in a real call sequence. This
7706 should be refined to issue diagnostics helping error detection and
7709 /* Almost fake test, ensuring a use of each argument. */
7710 if (ftype1 == ftype2)
7716 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a
7717 type with all size expressions that contain F in a PLACEHOLDER_EXPR
7718 updated by replacing F with R.
7720 The function doesn't update the layout of the type, i.e. it assumes
7721 that the substitution is purely formal. That's why the replacement
7722 value R must itself contain a PLACEHOLDER_EXPR. */
7725 substitute_in_type (tree t, tree f, tree r)
7729 gcc_assert (CONTAINS_PLACEHOLDER_P (r));
7731 switch (TREE_CODE (t))
7738 /* First the domain types of arrays. */
7739 if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t))
7740 || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t)))
7742 tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r);
7743 tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r);
7745 if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t))
7748 new = copy_type (t);
7749 TYPE_GCC_MIN_VALUE (new) = low;
7750 TYPE_GCC_MAX_VALUE (new) = high;
7752 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t))
7754 (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
7759 /* Then the subtypes. */
7760 if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t))
7761 || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t)))
7763 tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r);
7764 tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r);
7766 if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t))
7769 new = copy_type (t);
7770 SET_TYPE_RM_MIN_VALUE (new, low);
7771 SET_TYPE_RM_MAX_VALUE (new, high);
7779 new = substitute_in_type (TREE_TYPE (t), f, r);
7780 if (new == TREE_TYPE (t))
7783 return build_complex_type (new);
7789 /* These should never show up here. */
7794 tree component = substitute_in_type (TREE_TYPE (t), f, r);
7795 tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r);
7797 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7800 new = build_array_type (component, domain);
7801 TYPE_ALIGN (new) = TYPE_ALIGN (t);
7802 TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t);
7803 SET_TYPE_MODE (new, TYPE_MODE (t));
7804 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7805 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7806 TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t);
7807 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
7808 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
7814 case QUAL_UNION_TYPE:
7816 bool changed_field = false;
7819 /* Start out with no fields, make new fields, and chain them
7820 in. If we haven't actually changed the type of any field,
7821 discard everything we've done and return the old type. */
7822 new = copy_type (t);
7823 TYPE_FIELDS (new) = NULL_TREE;
7825 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
7827 tree new_field = copy_node (field), new_n;
7829 new_n = substitute_in_type (TREE_TYPE (field), f, r);
7830 if (new_n != TREE_TYPE (field))
7832 TREE_TYPE (new_field) = new_n;
7833 changed_field = true;
7836 new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r);
7837 if (new_n != DECL_FIELD_OFFSET (field))
7839 DECL_FIELD_OFFSET (new_field) = new_n;
7840 changed_field = true;
7843 /* Do the substitution inside the qualifier, if any. */
7844 if (TREE_CODE (t) == QUAL_UNION_TYPE)
7846 new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
7847 if (new_n != DECL_QUALIFIER (field))
7849 DECL_QUALIFIER (new_field) = new_n;
7850 changed_field = true;
7854 DECL_CONTEXT (new_field) = new;
7855 SET_DECL_ORIGINAL_FIELD (new_field,
7856 (DECL_ORIGINAL_FIELD (field)
7857 ? DECL_ORIGINAL_FIELD (field) : field));
7859 TREE_CHAIN (new_field) = TYPE_FIELDS (new);
7860 TYPE_FIELDS (new) = new_field;
7866 TYPE_FIELDS (new) = nreverse (TYPE_FIELDS (new));
7867 TYPE_SIZE (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r);
7868 TYPE_SIZE_UNIT (new) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r);
7869 SET_TYPE_ADA_SIZE (new, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r));
7878 /* Return the RM size of GNU_TYPE. This is the actual number of bits
7879 needed to represent the object. */
7882 rm_size (tree gnu_type)
7884 /* For integral types, we store the RM size explicitly. */
7885 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
7886 return TYPE_RM_SIZE (gnu_type);
7888 /* Return the RM size of the actual data plus the size of the template. */
7889 if (TREE_CODE (gnu_type) == RECORD_TYPE
7890 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
7892 size_binop (PLUS_EXPR,
7893 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
7894 DECL_SIZE (TYPE_FIELDS (gnu_type)));
7896 /* For record types, we store the size explicitly. */
7897 if ((TREE_CODE (gnu_type) == RECORD_TYPE
7898 || TREE_CODE (gnu_type) == UNION_TYPE
7899 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
7900 && !TYPE_IS_FAT_POINTER_P (gnu_type)
7901 && TYPE_ADA_SIZE (gnu_type))
7902 return TYPE_ADA_SIZE (gnu_type);
7904 /* For other types, this is just the size. */
7905 return TYPE_SIZE (gnu_type);
7908 /* Return the name to be used for GNAT_ENTITY. If a type, create a
7909 fully-qualified name, possibly with type information encoding.
7910 Otherwise, return the name. */
7913 get_entity_name (Entity_Id gnat_entity)
7915 Get_Encoded_Name (gnat_entity);
7916 return get_identifier_with_length (Name_Buffer, Name_Len);
7919 /* Return an identifier representing the external name to be used for
7920 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
7921 and the specified suffix. */
7924 create_concat_name (Entity_Id gnat_entity, const char *suffix)
7926 Entity_Kind kind = Ekind (gnat_entity);
7930 String_Template temp = {1, strlen (suffix)};
7931 Fat_Pointer fp = {suffix, &temp};
7932 Get_External_Name_With_Suffix (gnat_entity, fp);
7935 Get_External_Name (gnat_entity, 0);
7937 /* A variable using the Stdcall convention lives in a DLL. We adjust
7938 its name to use the jump table, the _imp__NAME contains the address
7939 for the NAME variable. */
7940 if ((kind == E_Variable || kind == E_Constant)
7941 && Has_Stdcall_Convention (gnat_entity))
7943 const int len = 6 + Name_Len;
7944 char *new_name = (char *) alloca (len + 1);
7945 strcpy (new_name, "_imp__");
7946 strcat (new_name, Name_Buffer);
7947 return get_identifier_with_length (new_name, len);
7950 return get_identifier_with_length (Name_Buffer, Name_Len);
7953 /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a
7954 string, return a new IDENTIFIER_NODE that is the concatenation of
7955 the name followed by "___" and the specified suffix. */
7958 concat_name (tree gnu_name, const char *suffix)
7960 const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix);
7961 char *new_name = (char *) alloca (len + 1);
7962 strcpy (new_name, IDENTIFIER_POINTER (gnu_name));
7963 strcat (new_name, "___");
7964 strcat (new_name, suffix);
7965 return get_identifier_with_length (new_name, len);
7968 #include "gt-ada-decl.h"
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