1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2004, 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 2, 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 distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
20 * MA 02111-1307, USA. *
22 * GNAT was originally developed by the GNAT team at New York University. *
23 * Extensive contributions were provided by Ada Core Technologies Inc. *
25 ****************************************************************************/
29 #include "coretypes.h"
55 /* Provide default values for the macros controlling stack checking.
56 This is copied from GCC's expr.h. */
58 #ifndef STACK_CHECK_BUILTIN
59 #define STACK_CHECK_BUILTIN 0
61 #ifndef STACK_CHECK_PROBE_INTERVAL
62 #define STACK_CHECK_PROBE_INTERVAL 4096
64 #ifndef STACK_CHECK_MAX_FRAME_SIZE
65 #define STACK_CHECK_MAX_FRAME_SIZE \
66 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
68 #ifndef STACK_CHECK_MAX_VAR_SIZE
69 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
72 /* These two variables are used to defer recursively expanding incomplete
73 types while we are processing a record or subprogram type. */
75 static int defer_incomplete_level = 0;
76 static struct incomplete
78 struct incomplete *next;
81 } *defer_incomplete_list = 0;
83 static void copy_alias_set (tree, tree);
84 static tree substitution_list (Entity_Id, Entity_Id, tree, int);
85 static int allocatable_size_p (tree, int);
86 static struct attrib *build_attr_list (Entity_Id);
87 static tree elaborate_expression (Node_Id, Entity_Id, tree, int, int, int);
88 static int is_variable_size (tree);
89 static tree elaborate_expression_1 (Node_Id, Entity_Id, tree, tree, int, int);
90 static tree make_packable_type (tree);
91 static tree maybe_pad_type (tree, tree, unsigned int, Entity_Id, const char *,
93 static tree gnat_to_gnu_field (Entity_Id, tree, int, int);
94 static void components_to_record (tree, Node_Id, tree, int, int, tree *,
96 static int compare_field_bitpos (const PTR, const PTR);
97 static Uint annotate_value (tree);
98 static void annotate_rep (Entity_Id, tree);
99 static tree compute_field_positions (tree, tree, tree, tree, unsigned int);
100 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, int, int);
101 static void set_rm_size (Uint, tree, Entity_Id);
102 static tree make_type_from_size (tree, tree, int);
103 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
104 static void check_ok_for_atomic (tree, Entity_Id, int);
106 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
107 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
108 refer to an Ada type. */
111 gnat_to_gnu_type (Entity_Id gnat_entity)
115 /* The back end never attempts to annotate generic types */
116 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
117 return void_type_node;
119 /* Convert the ada entity type into a GCC TYPE_DECL node. */
120 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
121 if (TREE_CODE (gnu_decl) != TYPE_DECL)
124 return TREE_TYPE (gnu_decl);
127 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
128 entity, this routine returns the equivalent GCC tree for that entity
129 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
132 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
133 initial value (in GCC tree form). This is optional for variables.
134 For renamed entities, GNU_EXPR gives the object being renamed.
136 DEFINITION is nonzero if this call is intended for a definition. This is
137 used for separate compilation where it necessary to know whether an
138 external declaration or a definition should be created if the GCC equivalent
139 was not created previously. The value of 1 is normally used for a non-zero
140 DEFINITION, but a value of 2 is used in special circumstances, defined in
144 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
148 /* Contains the gnu XXXX_DECL tree node which is equivalent to the input
149 GNAT tree. This node will be associated with the GNAT node by calling
150 the save_gnu_tree routine at the end of the `switch' statement. */
152 /* Nonzero if we have already saved gnu_decl as a gnat association. */
154 /* Nonzero if we incremented defer_incomplete_level. */
155 int this_deferred = 0;
156 /* Nonzero if we incremented force_global. */
158 /* Nonzero if we should check to see if elaborated during processing. */
159 int maybe_present = 0;
160 /* Nonzero if we made GNU_DECL and its type here. */
161 int this_made_decl = 0;
162 struct attrib *attr_list = 0;
163 int debug_info_p = (Needs_Debug_Info (gnat_entity)
164 || debug_info_level == DINFO_LEVEL_VERBOSE);
165 Entity_Kind kind = Ekind (gnat_entity);
168 = ((Known_Esize (gnat_entity)
169 && UI_Is_In_Int_Range (Esize (gnat_entity)))
170 ? MIN (UI_To_Int (Esize (gnat_entity)),
171 IN (kind, Float_Kind)
172 ? fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE)
173 : IN (kind, Access_Kind) ? POINTER_SIZE * 2
174 : LONG_LONG_TYPE_SIZE)
175 : LONG_LONG_TYPE_SIZE);
178 = ((Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity)))
179 || From_With_Type (gnat_entity));
180 unsigned int align = 0;
182 /* Since a use of an Itype is a definition, process it as such if it
183 is not in a with'ed unit. */
185 if (! definition && Is_Itype (gnat_entity)
186 && ! present_gnu_tree (gnat_entity)
187 && In_Extended_Main_Code_Unit (gnat_entity))
189 /* Ensure that we are in a subprogram mentioned in the Scope
190 chain of this entity, our current scope is global,
191 or that we encountered a task or entry (where we can't currently
192 accurately check scoping). */
193 if (current_function_decl == 0
194 || DECL_ELABORATION_PROC_P (current_function_decl))
196 process_type (gnat_entity);
197 return get_gnu_tree (gnat_entity);
200 for (gnat_temp = Scope (gnat_entity);
201 Present (gnat_temp); gnat_temp = Scope (gnat_temp))
203 if (Is_Type (gnat_temp))
204 gnat_temp = Underlying_Type (gnat_temp);
206 if (Ekind (gnat_temp) == E_Subprogram_Body)
208 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
210 if (IN (Ekind (gnat_temp), Subprogram_Kind)
211 && Present (Protected_Body_Subprogram (gnat_temp)))
212 gnat_temp = Protected_Body_Subprogram (gnat_temp);
214 if (Ekind (gnat_temp) == E_Entry
215 || Ekind (gnat_temp) == E_Entry_Family
216 || Ekind (gnat_temp) == E_Task_Type
217 || (IN (Ekind (gnat_temp), Subprogram_Kind)
218 && present_gnu_tree (gnat_temp)
219 && (current_function_decl
220 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
222 process_type (gnat_entity);
223 return get_gnu_tree (gnat_entity);
227 /* gigi abort 122 means that the entity "gnat_entity" has an incorrect
228 scope, i.e. that its scope does not correspond to the subprogram
229 in which it is declared */
233 /* If this is entity 0, something went badly wrong. */
234 if (gnat_entity == 0)
237 /* If we've already processed this entity, return what we got last time.
238 If we are defining the node, we should not have already processed it.
239 In that case, we will abort below when we try to save a new GCC tree for
240 this object. We also need to handle the case of getting a dummy type
241 when a Full_View exists. */
243 if (present_gnu_tree (gnat_entity)
245 || (Is_Type (gnat_entity) && imported_p)))
247 gnu_decl = get_gnu_tree (gnat_entity);
249 if (TREE_CODE (gnu_decl) == TYPE_DECL
250 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
251 && IN (kind, Incomplete_Or_Private_Kind)
252 && Present (Full_View (gnat_entity)))
254 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
257 save_gnu_tree (gnat_entity, NULL_TREE, 0);
258 save_gnu_tree (gnat_entity, gnu_decl, 0);
264 /* If this is a numeric or enumeral type, or an access type, a nonzero
265 Esize must be specified unless it was specified by the programmer. */
266 if ((IN (kind, Numeric_Kind) || IN (kind, Enumeration_Kind)
267 || (IN (kind, Access_Kind)
268 && kind != E_Access_Protected_Subprogram_Type
269 && kind != E_Access_Subtype))
270 && Unknown_Esize (gnat_entity)
271 && ! Has_Size_Clause (gnat_entity))
274 /* Likewise, RM_Size must be specified for all discrete and fixed-point
276 if (IN (kind, Discrete_Or_Fixed_Point_Kind)
277 && Unknown_RM_Size (gnat_entity))
280 /* Get the name of the entity and set up the line number and filename of
281 the original definition for use in any decl we make. */
283 gnu_entity_id = get_entity_name (gnat_entity);
284 set_lineno (gnat_entity, 0);
286 /* If we get here, it means we have not yet done anything with this
287 entity. If we are not defining it here, it must be external,
288 otherwise we should have defined it already. */
289 if (! definition && ! Is_Public (gnat_entity)
290 && ! type_annotate_only
291 && kind != E_Discriminant && kind != E_Component
293 && ! (kind == E_Constant && Present (Full_View (gnat_entity)))
295 && !IN (kind, Type_Kind)
300 /* For cases when we are not defining (i.e., we are referencing from
301 another compilation unit) Public entities, show we are at global level
302 for the purpose of computing sizes. Don't do this for components or
303 discriminants since the relevant test is whether or not the record is
305 if (! definition && Is_Public (gnat_entity)
306 && ! Is_Statically_Allocated (gnat_entity)
307 && kind != E_Discriminant && kind != E_Component)
308 force_global++, this_global = 1;
310 /* Handle any attributes. */
311 if (Has_Gigi_Rep_Item (gnat_entity))
312 attr_list = build_attr_list (gnat_entity);
317 /* If this is a use of a deferred constant, get its full
319 if (! definition && Present (Full_View (gnat_entity)))
321 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
322 gnu_expr, definition);
327 /* If we have an external constant that we are not defining,
328 get the expression that is was defined to represent. We
329 may throw that expression away later if it is not a
331 Do not retrieve the expression if it is an aggregate, because
332 in complex instantiation contexts it may not be expanded */
335 && Present (Expression (Declaration_Node (gnat_entity)))
336 && ! No_Initialization (Declaration_Node (gnat_entity))
337 && Nkind (Expression (Declaration_Node (gnat_entity)))
339 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
341 /* Ignore deferred constant definitions; they are processed fully in the
342 front-end. For deferred constant references, get the full
343 definition. On the other hand, constants that are renamings are
344 handled like variable renamings. If No_Initialization is set, this is
345 not a deferred constant but a constant whose value is built
348 if (definition && gnu_expr == 0
349 && ! No_Initialization (Declaration_Node (gnat_entity))
350 && No (Renamed_Object (gnat_entity)))
352 gnu_decl = error_mark_node;
356 else if (! definition && IN (kind, Incomplete_Or_Private_Kind)
357 && Present (Full_View (gnat_entity)))
359 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
368 /* If this is not a VMS exception, treat it as a normal object.
369 Otherwise, make an object at the specific address of character
370 type, point to it, and convert it to integer, and mask off
372 if (! Is_VMS_Exception (gnat_entity))
375 /* Allocate the global object that we use to get the value of the
377 gnu_decl = create_var_decl (gnu_entity_id,
378 (Present (Interface_Name (gnat_entity))
379 ? create_concat_name (gnat_entity, 0)
381 char_type_node, NULL_TREE, 0, 0, 1, 1,
384 /* Now return the expression giving the desired value. */
386 = build_binary_op (BIT_AND_EXPR, integer_type_node,
387 convert (integer_type_node,
388 build_unary_op (ADDR_EXPR, NULL_TREE,
390 build_unary_op (NEGATE_EXPR, integer_type_node,
391 build_int_2 (7, 0)));
393 save_gnu_tree (gnat_entity, gnu_decl, 1);
400 /* The GNAT record where the component was defined. */
401 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
403 /* If the variable is an inherited record component (in the case of
404 extended record types), just return the inherited entity, which
405 must be a FIELD_DECL. Likewise for discriminants.
406 For discriminants of untagged records which have explicit
407 stored discriminants, return the entity for the corresponding
408 stored discriminant. Also use Original_Record_Component
409 if the record has a private extension. */
411 if ((Base_Type (gnat_record) == gnat_record
412 || Ekind (Scope (gnat_entity)) == E_Private_Subtype
413 || Ekind (Scope (gnat_entity)) == E_Record_Subtype_With_Private
414 || Ekind (Scope (gnat_entity)) == E_Record_Type_With_Private)
415 && Present (Original_Record_Component (gnat_entity))
416 && Original_Record_Component (gnat_entity) != gnat_entity)
419 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
420 gnu_expr, definition);
425 /* If the enclosing record has explicit stored discriminants,
426 then it is an untagged record. If the Corresponding_Discriminant
427 is not empty then this must be a renamed discriminant and its
428 Original_Record_Component must point to the corresponding explicit
429 stored discriminant (i.e., we should have taken the previous
432 else if (Present (Corresponding_Discriminant (gnat_entity))
433 && Is_Tagged_Type (gnat_record))
435 /* A tagged record has no explicit stored discriminants. */
437 if (First_Discriminant (gnat_record)
438 != First_Stored_Discriminant (gnat_record))
442 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
443 gnu_expr, definition);
448 /* If the enclosing record has explicit stored discriminants,
449 then it is an untagged record. If the Corresponding_Discriminant
450 is not empty then this must be a renamed discriminant and its
451 Original_Record_Component must point to the corresponding explicit
452 stored discriminant (i.e., we should have taken the first
455 else if (Present (Corresponding_Discriminant (gnat_entity))
456 && (First_Discriminant (gnat_record)
457 != First_Stored_Discriminant (gnat_record)))
460 /* Otherwise, if we are not defining this and we have no GCC type
461 for the containing record, make one for it. Then we should
462 have made our own equivalent. */
463 else if (! definition && ! present_gnu_tree (gnat_record))
465 /* ??? If this is in a record whose scope is a protected
466 type and we have an Original_Record_Component, use it.
467 This is a workaround for major problems in protected type
470 Entity_Id Scop = Scope (Scope (gnat_entity));
471 if ((Is_Protected_Type (Scop)
472 || (Is_Private_Type (Scop)
473 && Present (Full_View (Scop))
474 && Is_Protected_Type (Full_View (Scop))))
475 && Present (Original_Record_Component (gnat_entity)))
478 = gnat_to_gnu_entity (Original_Record_Component
480 gnu_expr, definition);
485 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
486 gnu_decl = get_gnu_tree (gnat_entity);
491 /* Here we have no GCC type and this is a reference rather than a
492 definition. This should never happen. Most likely the cause is a
493 reference before declaration in the gnat tree for gnat_entity. */
498 case E_Loop_Parameter:
499 case E_Out_Parameter:
502 /* Simple variables, loop variables, OUT parameters, and exceptions. */
507 = ((kind == E_Constant || kind == E_Variable)
508 && ! Is_Statically_Allocated (gnat_entity)
509 && Is_True_Constant (gnat_entity)
510 && (((Nkind (Declaration_Node (gnat_entity))
511 == N_Object_Declaration)
512 && Present (Expression (Declaration_Node (gnat_entity))))
513 || Present (Renamed_Object (gnat_entity))));
514 int inner_const_flag = const_flag;
515 int static_p = Is_Statically_Allocated (gnat_entity);
516 tree gnu_ext_name = NULL_TREE;
518 if (Present (Renamed_Object (gnat_entity)) && ! definition)
520 if (kind == E_Exception)
521 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
524 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
527 /* Get the type after elaborating the renamed object. */
528 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
530 /* If this is a loop variable, its type should be the base type.
531 This is because the code for processing a loop determines whether
532 a normal loop end test can be done by comparing the bounds of the
533 loop against those of the base type, which is presumed to be the
534 size used for computation. But this is not correct when the size
535 of the subtype is smaller than the type. */
536 if (kind == E_Loop_Parameter)
537 gnu_type = get_base_type (gnu_type);
539 /* Reject non-renamed objects whose types are unconstrained arrays or
540 any object whose type is a dummy type or VOID_TYPE. */
542 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
543 && No (Renamed_Object (gnat_entity)))
544 || TYPE_IS_DUMMY_P (gnu_type)
545 || TREE_CODE (gnu_type) == VOID_TYPE)
547 if (type_annotate_only)
548 return error_mark_node;
553 /* If we are defining the object, see if it has a Size value and
554 validate it if so. If we are not defining the object and a Size
555 clause applies, simply retrieve the value. We don't want to ignore
556 the clause and it is expected to have been validated already. Then
557 get the new type, if any. */
559 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
560 gnat_entity, VAR_DECL, 0,
561 Has_Size_Clause (gnat_entity));
562 else if (Has_Size_Clause (gnat_entity))
563 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
568 = make_type_from_size (gnu_type, gnu_size,
569 Has_Biased_Representation (gnat_entity));
571 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
575 /* If this object has self-referential size, it must be a record with
576 a default value. We are supposed to allocate an object of the
577 maximum size in this case unless it is a constant with an
578 initializing expression, in which case we can get the size from
579 that. Note that the resulting size may still be a variable, so
580 this may end up with an indirect allocation. */
582 if (No (Renamed_Object (gnat_entity))
583 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
585 if (gnu_expr != 0 && kind == E_Constant)
587 gnu_size = TYPE_SIZE (TREE_TYPE (gnu_expr));
588 if (CONTAINS_PLACEHOLDER_P (gnu_size))
589 gnu_size = build (WITH_RECORD_EXPR, bitsizetype,
593 /* We may have no GNU_EXPR because No_Initialization is
594 set even though there's an Expression. */
595 else if (kind == E_Constant
596 && (Nkind (Declaration_Node (gnat_entity))
597 == N_Object_Declaration)
598 && Present (Expression (Declaration_Node (gnat_entity))))
600 = TYPE_SIZE (gnat_to_gnu_type
602 (Expression (Declaration_Node (gnat_entity)))));
604 gnu_size = max_size (TYPE_SIZE (gnu_type), 1);
607 /* If the size is zero bytes, make it one byte since some linkers have
608 trouble with zero-sized objects. If the object will have a
609 template, that will make it nonzero so don't bother. Also avoid
610 doing that for an object renaming or an object with an address
611 clause, as we would lose useful information on the view size
612 (e.g. for null array slices) and we are not allocating the object
614 if (((gnu_size != 0 && integer_zerop (gnu_size))
615 || (TYPE_SIZE (gnu_type) != 0
616 && integer_zerop (TYPE_SIZE (gnu_type))))
617 && (! Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
618 || ! Is_Array_Type (Etype (gnat_entity)))
619 && ! Present (Renamed_Object (gnat_entity))
620 && ! Present (Address_Clause (gnat_entity)))
621 gnu_size = bitsize_unit_node;
623 /* If an alignment is specified, use it if valid. Note that
624 exceptions are objects but don't have alignments. */
625 if (kind != E_Exception && Known_Alignment (gnat_entity))
627 if (No (Alignment (gnat_entity)))
631 = validate_alignment (Alignment (gnat_entity), gnat_entity,
632 TYPE_ALIGN (gnu_type));
635 /* If this is an atomic object with no specified size and alignment,
636 but where the size of the type is a constant, set the alignment to
637 the lowest power of two greater than the size, or to the
638 biggest meaningful alignment, whichever is smaller. */
640 if (Is_Atomic (gnat_entity) && gnu_size == 0 && align == 0
641 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
643 if (! host_integerp (TYPE_SIZE (gnu_type), 1)
644 || 0 <= compare_tree_int (TYPE_SIZE (gnu_type),
646 align = BIGGEST_ALIGNMENT;
648 align = ((unsigned int) 1
649 << (floor_log2 (tree_low_cst
650 (TYPE_SIZE (gnu_type), 1) - 1)
654 /* If the object is set to have atomic components, find the component
655 type and validate it.
657 ??? Note that we ignore Has_Volatile_Components on objects; it's
658 not at all clear what to do in that case. */
660 if (Has_Atomic_Components (gnat_entity))
663 = (TREE_CODE (gnu_type) == ARRAY_TYPE
664 ? TREE_TYPE (gnu_type) : gnu_type);
666 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
667 && TYPE_MULTI_ARRAY_P (gnu_inner))
668 gnu_inner = TREE_TYPE (gnu_inner);
670 check_ok_for_atomic (gnu_inner, gnat_entity, 1);
673 /* Now check if the type of the object allows atomic access. Note
674 that we must test the type, even if this object has size and
675 alignment to allow such access, because we will be going
676 inside the padded record to assign to the object. We could fix
677 this by always copying via an intermediate value, but it's not
678 clear it's worth the effort. */
679 if (Is_Atomic (gnat_entity))
680 check_ok_for_atomic (gnu_type, gnat_entity, 0);
682 /* If this is an aliased object with an unconstrained nominal subtype,
683 make a type that includes the template. */
684 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
685 && Is_Array_Type (Etype (gnat_entity))
686 && ! type_annotate_only)
689 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
691 = TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_fat))));
694 = build_unc_object_type (gnu_temp_type, gnu_type,
695 concat_id_with_name (gnu_entity_id,
699 #ifdef MINIMUM_ATOMIC_ALIGNMENT
700 /* If the size is a constant and no alignment is specified, force
701 the alignment to be the minimum valid atomic alignment. The
702 restriction on constant size avoids problems with variable-size
703 temporaries; if the size is variable, there's no issue with
704 atomic access. Also don't do this for a constant, since it isn't
705 necessary and can interfere with constant replacement. Finally,
706 do not do it for Out parameters since that creates an
707 size inconsistency with In parameters. */
708 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
709 && ! FLOAT_TYPE_P (gnu_type)
710 && ! const_flag && No (Renamed_Object (gnat_entity))
711 && ! imported_p && No (Address_Clause (gnat_entity))
712 && kind != E_Out_Parameter
713 && (gnu_size != 0 ? TREE_CODE (gnu_size) == INTEGER_CST
714 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
715 align = MINIMUM_ATOMIC_ALIGNMENT;
718 /* Make a new type with the desired size and alignment, if needed. */
719 gnu_type = maybe_pad_type (gnu_type, gnu_size, align,
720 gnat_entity, "PAD", 0, definition, 1);
722 /* Make a volatile version of this object's type if we are to
723 make the object volatile. Note that 13.3(19) says that we
724 should treat other types of objects as volatile as well. */
725 if ((Treat_As_Volatile (gnat_entity)
726 || Is_Exported (gnat_entity)
727 || Is_Imported (gnat_entity)
728 || Present (Address_Clause (gnat_entity)))
729 && ! TYPE_VOLATILE (gnu_type))
730 gnu_type = build_qualified_type (gnu_type,
731 (TYPE_QUALS (gnu_type)
732 | TYPE_QUAL_VOLATILE));
734 /* Convert the expression to the type of the object except in the
735 case where the object's type is unconstrained or the object's type
736 is a padded record whose field is of self-referential size. In
737 the former case, converting will generate unnecessary evaluations
738 of the CONSTRUCTOR to compute the size and in the latter case, we
739 want to only copy the actual data. */
741 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
742 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
743 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
744 && TYPE_IS_PADDING_P (gnu_type)
745 && (CONTAINS_PLACEHOLDER_P
746 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
747 gnu_expr = convert (gnu_type, gnu_expr);
749 /* See if this is a renaming. If this is a constant renaming,
750 treat it as a normal variable whose initial value is what
751 is being renamed. We cannot do this if the type is
752 unconstrained or class-wide.
754 Otherwise, if what we are renaming is a reference, we can simply
755 return a stabilized version of that reference, after forcing
756 any SAVE_EXPRs to be evaluated. But, if this is at global level,
757 we can only do this if we know no SAVE_EXPRs will be made.
758 Otherwise, make this into a constant pointer to the object we are
761 if (Present (Renamed_Object (gnat_entity)))
763 /* If the renamed object had padding, strip off the reference
764 to the inner object and reset our type. */
765 if (TREE_CODE (gnu_expr) == COMPONENT_REF
766 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
768 && (TYPE_IS_PADDING_P
769 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
771 gnu_expr = TREE_OPERAND (gnu_expr, 0);
772 gnu_type = TREE_TYPE (gnu_expr);
776 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
777 && TYPE_MODE (gnu_type) != BLKmode
778 && Ekind (Etype (gnat_entity)) != E_Class_Wide_Type
779 && !Is_Array_Type (Etype (gnat_entity)))
782 /* If this is a declaration or reference, we can just use that
783 declaration or reference as this entity. */
784 else if ((DECL_P (gnu_expr)
785 || TREE_CODE_CLASS (TREE_CODE (gnu_expr)) == 'r')
786 && ! Materialize_Entity (gnat_entity)
787 && (! global_bindings_p ()
788 || (staticp (gnu_expr)
789 && ! TREE_SIDE_EFFECTS (gnu_expr))))
791 set_lineno (gnat_entity, ! global_bindings_p ());
792 gnu_decl = gnat_stabilize_reference (gnu_expr, 1);
793 save_gnu_tree (gnat_entity, gnu_decl, 1);
796 if (! global_bindings_p ())
797 expand_expr_stmt (build1 (CONVERT_EXPR, void_type_node,
803 inner_const_flag = TREE_READONLY (gnu_expr);
805 gnu_type = build_reference_type (gnu_type);
806 gnu_expr = build_unary_op (ADDR_EXPR, gnu_type, gnu_expr);
812 /* If this is an aliased object whose nominal subtype is unconstrained,
813 the object is a record that contains both the template and
814 the object. If there is an initializer, it will have already
815 been converted to the right type, but we need to create the
816 template if there is no initializer. */
817 else if (definition && TREE_CODE (gnu_type) == RECORD_TYPE
818 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
819 /* Beware that padding might have been introduced
820 via maybe_pad_type above. */
821 || (TYPE_IS_PADDING_P (gnu_type)
822 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
824 && TYPE_CONTAINS_TEMPLATE_P
825 (TREE_TYPE (TYPE_FIELDS (gnu_type)))))
829 = TYPE_IS_PADDING_P (gnu_type)
830 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
831 : TYPE_FIELDS (gnu_type);
834 = gnat_build_constructor
838 build_template (TREE_TYPE (template_field),
839 TREE_TYPE (TREE_CHAIN (template_field)),
844 /* If this is a pointer and it does not have an initializing
845 expression, initialize it to NULL, unless the obect is
848 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
849 && !Is_Imported (gnat_entity)
851 gnu_expr = integer_zero_node;
853 /* If we are defining the object and it has an Address clause we must
854 get the address expression from the saved GCC tree for the
855 object if the object has a Freeze_Node. Otherwise, we elaborate
856 the address expression here since the front-end has guaranteed
857 in that case that the elaboration has no effects. Note that
858 only the latter mechanism is currently in use. */
859 if (definition && Present (Address_Clause (gnat_entity)))
862 = (present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity)
863 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
865 save_gnu_tree (gnat_entity, NULL_TREE, 0);
867 /* Ignore the size. It's either meaningless or was handled
870 gnu_type = build_reference_type (gnu_type);
871 gnu_address = convert (gnu_type, gnu_address);
873 const_flag = ! Is_Public (gnat_entity);
875 /* If we don't have an initializing expression for the underlying
876 variable, the initializing expression for the pointer is the
877 specified address. Otherwise, we have to make a COMPOUND_EXPR
878 to assign both the address and the initial value. */
880 gnu_expr = gnu_address;
883 = build (COMPOUND_EXPR, gnu_type,
885 (MODIFY_EXPR, NULL_TREE,
886 build_unary_op (INDIRECT_REF, NULL_TREE,
892 /* If it has an address clause and we are not defining it, mark it
893 as an indirect object. Likewise for Stdcall objects that are
895 if ((! definition && Present (Address_Clause (gnat_entity)))
896 || (Is_Imported (gnat_entity)
897 && Convention (gnat_entity) == Convention_Stdcall))
899 gnu_type = build_reference_type (gnu_type);
904 /* If we are at top level and this object is of variable size,
905 make the actual type a hidden pointer to the real type and
906 make the initializer be a memory allocation and initialization.
907 Likewise for objects we aren't defining (presumed to be
908 external references from other packages), but there we do
909 not set up an initialization.
911 If the object's size overflows, make an allocator too, so that
912 Storage_Error gets raised. Note that we will never free
913 such memory, so we presume it never will get allocated. */
915 if (! allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
916 global_bindings_p () || ! definition
919 && ! allocatable_size_p (gnu_size,
920 global_bindings_p () || ! definition
923 gnu_type = build_reference_type (gnu_type);
928 /* Get the data part of GNU_EXPR in case this was a
929 aliased object whose nominal subtype is unconstrained.
930 In that case the pointer above will be a thin pointer and
931 build_allocator will automatically make the template and
932 constructor already made above. */
936 tree gnu_alloc_type = TREE_TYPE (gnu_type);
938 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
939 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
942 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
944 = build_component_ref
945 (gnu_expr, NULL_TREE,
946 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), 0);
949 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
950 && TREE_CONSTANT_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
951 && ! Is_Imported (gnat_entity))
952 post_error ("Storage_Error will be raised at run-time?",
955 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr,
956 gnu_type, 0, 0, gnat_entity);
965 /* If this object would go into the stack and has an alignment
966 larger than the default largest alignment, make a variable
967 to hold the "aligning type" with a modified initial value,
968 if any, then point to it and make that the value of this
969 variable, which is now indirect. */
971 if (! global_bindings_p () && ! static_p && definition
972 && ! imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
975 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
976 TYPE_SIZE_UNIT (gnu_type));
979 set_lineno (gnat_entity, 1);
981 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
982 NULL_TREE, gnu_new_type, gnu_expr,
988 (MODIFY_EXPR, NULL_TREE,
989 build_component_ref (gnu_new_var, NULL_TREE,
990 TYPE_FIELDS (gnu_new_type), 0),
993 gnu_type = build_reference_type (gnu_type);
996 (ADDR_EXPR, gnu_type,
997 build_component_ref (gnu_new_var, NULL_TREE,
998 TYPE_FIELDS (gnu_new_type), 0));
1005 /* Convert the expression to the type of the object except in the
1006 case where the object's type is unconstrained or the object's type
1007 is a padded record whose field is of self-referential size. In
1008 the former case, converting will generate unnecessary evaluations
1009 of the CONSTRUCTOR to compute the size and in the latter case, we
1010 want to only copy the actual data. */
1012 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1013 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1014 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
1015 && TYPE_IS_PADDING_P (gnu_type)
1016 && (CONTAINS_PLACEHOLDER_P
1017 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1018 gnu_expr = convert (gnu_type, gnu_expr);
1020 /* This name is external or there was a name specified, use it.
1021 Don't use the Interface_Name if there is an address clause.
1023 if ((Present (Interface_Name (gnat_entity))
1024 && No (Address_Clause (gnat_entity)))
1025 || (Is_Public (gnat_entity)
1026 && (! Is_Imported (gnat_entity) || Is_Exported (gnat_entity))))
1027 gnu_ext_name = create_concat_name (gnat_entity, 0);
1030 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1031 | TYPE_QUAL_CONST));
1033 /* If this is constant initialized to a static constant and the
1034 object has an aggregrate type, force it to be statically
1036 if (const_flag && gnu_expr && TREE_CONSTANT (gnu_expr)
1037 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1038 && (AGGREGATE_TYPE_P (gnu_type)
1039 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
1040 && TYPE_IS_PADDING_P (gnu_type))))
1043 set_lineno (gnat_entity, ! global_bindings_p ());
1044 gnu_decl = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1045 gnu_expr, const_flag,
1046 Is_Public (gnat_entity),
1047 imported_p || !definition,
1048 static_p, attr_list);
1050 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1051 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1053 /* If we have an address clause and we've made this indirect, it's
1054 not enough to merely mark the type as volatile since volatile
1055 references only conflict with other volatile references while this
1056 reference must conflict with all other references. So ensure that
1057 the dereferenced value has alias set 0. */
1058 if (Present (Address_Clause (gnat_entity)) && used_by_ref)
1059 DECL_POINTER_ALIAS_SET (gnu_decl) = 0;
1061 if (definition && DECL_SIZE (gnu_decl) != 0
1062 && gnu_block_stack != 0
1063 && TREE_VALUE (gnu_block_stack) != 0
1064 && (TREE_CODE (DECL_SIZE (gnu_decl)) != INTEGER_CST
1065 || (flag_stack_check && ! STACK_CHECK_BUILTIN
1066 && 0 < compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1067 STACK_CHECK_MAX_VAR_SIZE))))
1068 update_setjmp_buf (TREE_VALUE (gnu_block_stack));
1070 /* If this is a public constant or we're not optimizing and we're not
1071 making a VAR_DECL for it, make one just for export or debugger
1072 use. Likewise if the address is taken or if the object or type is
1074 if (definition && TREE_CODE (gnu_decl) == CONST_DECL
1075 && (Is_Public (gnat_entity)
1077 || Address_Taken (gnat_entity)
1078 || Is_Aliased (gnat_entity)
1079 || Is_Aliased (Etype (gnat_entity))))
1080 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl,
1081 create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1082 gnu_expr, 0, Is_Public (gnat_entity), 0,
1085 /* If this is declared in a block that contains an block with an
1086 exception handler, we must force this variable in memory to
1087 suppress an invalid optimization. */
1088 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1089 && Exception_Mechanism != GCC_ZCX)
1091 gnat_mark_addressable (gnu_decl);
1092 flush_addressof (gnu_decl);
1095 /* Back-annotate the Alignment of the object if not already in the
1096 tree. Likewise for Esize if the object is of a constant size.
1097 But if the "object" is actually a pointer to an object, the
1098 alignment and size are the same as teh type, so don't back-annotate
1099 the values for the pointer. */
1100 if (! used_by_ref && Unknown_Alignment (gnat_entity))
1101 Set_Alignment (gnat_entity,
1102 UI_From_Int (DECL_ALIGN (gnu_decl) / BITS_PER_UNIT));
1104 if (! used_by_ref && Unknown_Esize (gnat_entity)
1105 && DECL_SIZE (gnu_decl) != 0)
1107 tree gnu_back_size = DECL_SIZE (gnu_decl);
1109 if (TREE_CODE (TREE_TYPE (gnu_decl)) == RECORD_TYPE
1110 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_decl)))
1112 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN
1113 (TYPE_FIELDS (TREE_TYPE (gnu_decl)))));
1115 Set_Esize (gnat_entity, annotate_value (gnu_back_size));
1121 /* Return a TYPE_DECL for "void" that we previously made. */
1122 gnu_decl = void_type_decl_node;
1125 case E_Enumeration_Type:
1126 /* A special case, for the types Character and Wide_Character in
1127 Standard, we do not list all the literals. So if the literals
1128 are not specified, make this an unsigned type. */
1129 if (No (First_Literal (gnat_entity)))
1131 gnu_type = make_unsigned_type (esize);
1135 /* Normal case of non-character type, or non-Standard character type */
1137 /* Here we have a list of enumeral constants in First_Literal.
1138 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1139 the list to be places into TYPE_FIELDS. Each node in the list
1140 is a TREE_LIST node whose TREE_VALUE is the literal name
1141 and whose TREE_PURPOSE is the value of the literal.
1143 Esize contains the number of bits needed to represent the enumeral
1144 type, Type_Low_Bound also points to the first literal and
1145 Type_High_Bound points to the last literal. */
1147 Entity_Id gnat_literal;
1148 tree gnu_literal_list = NULL_TREE;
1150 if (Is_Unsigned_Type (gnat_entity))
1151 gnu_type = make_unsigned_type (esize);
1153 gnu_type = make_signed_type (esize);
1155 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1157 for (gnat_literal = First_Literal (gnat_entity);
1158 Present (gnat_literal);
1159 gnat_literal = Next_Literal (gnat_literal))
1161 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1164 = create_var_decl (get_entity_name (gnat_literal),
1165 0, gnu_type, gnu_value, 1, 0, 0, 0, 0);
1167 save_gnu_tree (gnat_literal, gnu_literal, 0);
1168 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1169 gnu_value, gnu_literal_list);
1172 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1174 /* Note that the bounds are updated at the end of this function
1175 because to avoid an infinite recursion when we get the bounds of
1176 this type, since those bounds are objects of this type. */
1180 case E_Signed_Integer_Type:
1181 case E_Ordinary_Fixed_Point_Type:
1182 case E_Decimal_Fixed_Point_Type:
1183 /* For integer types, just make a signed type the appropriate number
1185 gnu_type = make_signed_type (esize);
1188 case E_Modular_Integer_Type:
1189 /* For modular types, make the unsigned type of the proper number of
1190 bits and then set up the modulus, if required. */
1192 enum machine_mode mode;
1196 if (Is_Packed_Array_Type (gnat_entity))
1197 esize = UI_To_Int (RM_Size (gnat_entity));
1199 /* Find the smallest mode at least ESIZE bits wide and make a class
1202 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1203 GET_MODE_BITSIZE (mode) < esize;
1204 mode = GET_MODE_WIDER_MODE (mode))
1207 gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode));
1208 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
1209 = Is_Packed_Array_Type (gnat_entity);
1211 /* Get the modulus in this type. If it overflows, assume it is because
1212 it is equal to 2**Esize. Note that there is no overflow checking
1213 done on unsigned type, so we detect the overflow by looking for
1214 a modulus of zero, which is otherwise invalid. */
1215 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1217 if (! integer_zerop (gnu_modulus))
1219 TYPE_MODULAR_P (gnu_type) = 1;
1220 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1221 gnu_high = fold (build (MINUS_EXPR, gnu_type, gnu_modulus,
1222 convert (gnu_type, integer_one_node)));
1225 /* If we have to set TYPE_PRECISION different from its natural value,
1226 make a subtype to do do. Likewise if there is a modulus and
1227 it is not one greater than TYPE_MAX_VALUE. */
1228 if (TYPE_PRECISION (gnu_type) != esize
1229 || (TYPE_MODULAR_P (gnu_type)
1230 && ! tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high)))
1232 tree gnu_subtype = make_node (INTEGER_TYPE);
1234 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1235 TREE_TYPE (gnu_subtype) = gnu_type;
1236 TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type);
1237 TYPE_MAX_VALUE (gnu_subtype)
1238 = TYPE_MODULAR_P (gnu_type)
1239 ? gnu_high : TYPE_MAX_VALUE (gnu_type);
1240 TYPE_PRECISION (gnu_subtype) = esize;
1241 TREE_UNSIGNED (gnu_subtype) = 1;
1242 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1243 TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype)
1244 = Is_Packed_Array_Type (gnat_entity);
1245 layout_type (gnu_subtype);
1247 gnu_type = gnu_subtype;
1252 case E_Signed_Integer_Subtype:
1253 case E_Enumeration_Subtype:
1254 case E_Modular_Integer_Subtype:
1255 case E_Ordinary_Fixed_Point_Subtype:
1256 case E_Decimal_Fixed_Point_Subtype:
1258 /* For integral subtypes, we make a new INTEGER_TYPE. Note
1259 that we do not want to call build_range_type since we would
1260 like each subtype node to be distinct. This will be important
1261 when memory aliasing is implemented.
1263 The TREE_TYPE field of the INTEGER_TYPE we make points to the
1264 parent type; this fact is used by the arithmetic conversion
1267 We elaborate the Ancestor_Subtype if it is not in the current
1268 unit and one of our bounds is non-static. We do this to ensure
1269 consistent naming in the case where several subtypes share the same
1270 bounds by always elaborating the first such subtype first, thus
1274 && Present (Ancestor_Subtype (gnat_entity))
1275 && ! In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1276 && (! Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1277 || ! Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1278 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1279 gnu_expr, definition);
1281 gnu_type = make_node (INTEGER_TYPE);
1282 if (Is_Packed_Array_Type (gnat_entity))
1284 esize = UI_To_Int (RM_Size (gnat_entity));
1285 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1288 TYPE_PRECISION (gnu_type) = esize;
1289 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1291 TYPE_MIN_VALUE (gnu_type)
1292 = convert (TREE_TYPE (gnu_type),
1293 elaborate_expression (Type_Low_Bound (gnat_entity),
1295 get_identifier ("L"), definition, 1,
1296 Needs_Debug_Info (gnat_entity)));
1298 TYPE_MAX_VALUE (gnu_type)
1299 = convert (TREE_TYPE (gnu_type),
1300 elaborate_expression (Type_High_Bound (gnat_entity),
1302 get_identifier ("U"), definition, 1,
1303 Needs_Debug_Info (gnat_entity)));
1305 /* One of the above calls might have caused us to be elaborated,
1306 so don't blow up if so. */
1307 if (present_gnu_tree (gnat_entity))
1313 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1314 = Has_Biased_Representation (gnat_entity);
1316 /* This should be an unsigned type if the lower bound is constant
1317 and non-negative or if the base type is unsigned; a signed type
1319 TREE_UNSIGNED (gnu_type)
1320 = (TREE_UNSIGNED (TREE_TYPE (gnu_type))
1321 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
1322 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
1323 || TYPE_BIASED_REPRESENTATION_P (gnu_type)
1324 || Is_Unsigned_Type (gnat_entity));
1326 layout_type (gnu_type);
1328 /* If the type we are dealing with is to represent a packed array,
1329 we need to have the bits left justified on big-endian targets
1330 (see exp_packd.ads). We build a record with a bitfield of the
1331 appropriate size to achieve this. */
1332 if (Is_Packed_Array_Type (gnat_entity) && BYTES_BIG_ENDIAN)
1334 tree gnu_field_type = gnu_type;
1337 TYPE_RM_SIZE_INT (gnu_field_type)
1338 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1339 gnu_type = make_node (RECORD_TYPE);
1340 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "LJM");
1341 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1342 TYPE_PACKED (gnu_type) = 1;
1344 /* Don't notify the field as "addressable", since we won't be taking
1345 it's address and it would prevent create_field_decl from making a
1347 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1348 gnu_field_type, gnu_type, 1, 0, 0, 0);
1350 finish_record_type (gnu_type, gnu_field, 0, 0);
1351 TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1352 SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize));
1357 case E_Floating_Point_Type:
1358 /* If this is a VAX floating-point type, use an integer of the proper
1359 size. All the operations will be handled with ASM statements. */
1360 if (Vax_Float (gnat_entity))
1362 gnu_type = make_signed_type (esize);
1363 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1364 SET_TYPE_DIGITS_VALUE (gnu_type,
1365 UI_To_gnu (Digits_Value (gnat_entity),
1370 /* The type of the Low and High bounds can be our type if this is
1371 a type from Standard, so set them at the end of the function. */
1372 gnu_type = make_node (REAL_TYPE);
1373 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1374 layout_type (gnu_type);
1377 case E_Floating_Point_Subtype:
1378 if (Vax_Float (gnat_entity))
1380 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1386 && Present (Ancestor_Subtype (gnat_entity))
1387 && ! In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1388 && (! Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1389 || ! Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1390 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1391 gnu_expr, definition);
1393 gnu_type = make_node (REAL_TYPE);
1394 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1395 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1397 TYPE_MIN_VALUE (gnu_type)
1398 = convert (TREE_TYPE (gnu_type),
1399 elaborate_expression (Type_Low_Bound (gnat_entity),
1400 gnat_entity, get_identifier ("L"),
1402 Needs_Debug_Info (gnat_entity)));
1404 TYPE_MAX_VALUE (gnu_type)
1405 = convert (TREE_TYPE (gnu_type),
1406 elaborate_expression (Type_High_Bound (gnat_entity),
1407 gnat_entity, get_identifier ("U"),
1409 Needs_Debug_Info (gnat_entity)));
1411 /* One of the above calls might have caused us to be elaborated,
1412 so don't blow up if so. */
1413 if (present_gnu_tree (gnat_entity))
1419 layout_type (gnu_type);
1423 /* Array and String Types and Subtypes
1425 Unconstrained array types are represented by E_Array_Type and
1426 constrained array types are represented by E_Array_Subtype. There
1427 are no actual objects of an unconstrained array type; all we have
1428 are pointers to that type.
1430 The following fields are defined on array types and subtypes:
1432 Component_Type Component type of the array.
1433 Number_Dimensions Number of dimensions (an int).
1434 First_Index Type of first index. */
1439 tree gnu_template_fields = NULL_TREE;
1440 tree gnu_template_type = make_node (RECORD_TYPE);
1441 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1442 tree gnu_fat_type = make_node (RECORD_TYPE);
1443 int ndim = Number_Dimensions (gnat_entity);
1445 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1447 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1448 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
1449 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
1450 tree gnu_comp_size = 0;
1451 tree gnu_max_size = size_one_node;
1452 tree gnu_max_size_unit;
1454 Entity_Id gnat_ind_subtype;
1455 Entity_Id gnat_ind_base_subtype;
1456 tree gnu_template_reference;
1459 TYPE_NAME (gnu_template_type)
1460 = create_concat_name (gnat_entity, "XUB");
1461 TYPE_NAME (gnu_fat_type) = create_concat_name (gnat_entity, "XUP");
1462 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1463 TREE_READONLY (gnu_template_type) = 1;
1465 /* Make a node for the array. If we are not defining the array
1466 suppress expanding incomplete types and save the node as the type
1468 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1471 defer_incomplete_level++;
1472 this_deferred = this_made_decl = 1;
1473 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
1474 ! Comes_From_Source (gnat_entity),
1476 save_gnu_tree (gnat_entity, gnu_decl, 0);
1480 /* Build the fat pointer type. Use a "void *" object instead of
1481 a pointer to the array type since we don't have the array type
1482 yet (it will reference the fat pointer via the bounds). */
1483 tem = chainon (chainon (NULL_TREE,
1484 create_field_decl (get_identifier ("P_ARRAY"),
1486 gnu_fat_type, 0, 0, 0, 0)),
1487 create_field_decl (get_identifier ("P_BOUNDS"),
1489 gnu_fat_type, 0, 0, 0, 0));
1491 /* Make sure we can put this into a register. */
1492 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1493 finish_record_type (gnu_fat_type, tem, 0, 1);
1495 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1496 is the fat pointer. This will be used to access the individual
1497 fields once we build them. */
1498 tem = build (COMPONENT_REF, gnu_ptr_template,
1499 build (PLACEHOLDER_EXPR, gnu_fat_type),
1500 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)));
1501 gnu_template_reference
1502 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1503 TREE_READONLY (gnu_template_reference) = 1;
1505 /* Now create the GCC type for each index and add the fields for
1506 that index to the template. */
1507 for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
1508 gnat_ind_base_subtype
1509 = First_Index (Implementation_Base_Type (gnat_entity));
1510 index < ndim && index >= 0;
1512 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1513 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1515 char field_name[10];
1516 tree gnu_ind_subtype
1517 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1518 tree gnu_base_subtype
1519 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1521 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1523 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1524 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1526 /* Make the FIELD_DECLs for the minimum and maximum of this
1527 type and then make extractions of that field from the
1529 set_lineno (gnat_entity, 0);
1530 sprintf (field_name, "LB%d", index);
1531 gnu_min_field = create_field_decl (get_identifier (field_name),
1533 gnu_template_type, 0, 0, 0, 0);
1534 field_name[0] = 'U';
1535 gnu_max_field = create_field_decl (get_identifier (field_name),
1537 gnu_template_type, 0, 0, 0, 0);
1539 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1541 /* We can't use build_component_ref here since the template
1542 type isn't complete yet. */
1543 gnu_min = build (COMPONENT_REF, gnu_ind_subtype,
1544 gnu_template_reference, gnu_min_field);
1545 gnu_max = build (COMPONENT_REF, gnu_ind_subtype,
1546 gnu_template_reference, gnu_max_field);
1547 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1549 /* Make a range type with the new ranges, but using
1550 the Ada subtype. Then we convert to sizetype. */
1551 gnu_index_types[index]
1552 = create_index_type (convert (sizetype, gnu_min),
1553 convert (sizetype, gnu_max),
1554 build_range_type (gnu_ind_subtype,
1556 /* Update the maximum size of the array, in elements. */
1558 = size_binop (MULT_EXPR, gnu_max_size,
1559 size_binop (PLUS_EXPR, size_one_node,
1560 size_binop (MINUS_EXPR, gnu_base_max,
1563 TYPE_NAME (gnu_index_types[index])
1564 = create_concat_name (gnat_entity, field_name);
1567 for (index = 0; index < ndim; index++)
1569 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1571 /* Install all the fields into the template. */
1572 finish_record_type (gnu_template_type, gnu_template_fields, 0, 0);
1573 TREE_READONLY (gnu_template_type) = 1;
1575 /* Now make the array of arrays and update the pointer to the array
1576 in the fat pointer. Note that it is the first field. */
1578 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1580 /* Get and validate any specified Component_Size, but if Packed,
1581 ignore it since the front end will have taken care of it. */
1583 = validate_size (Component_Size (gnat_entity), tem,
1585 (Is_Bit_Packed_Array (gnat_entity)
1586 ? TYPE_DECL : VAR_DECL), 1,
1587 Has_Component_Size_Clause (gnat_entity));
1589 if (Has_Atomic_Components (gnat_entity))
1590 check_ok_for_atomic (tem, gnat_entity, 1);
1592 /* If the component type is a RECORD_TYPE that has a self-referential
1593 size, use the maxium size. */
1594 if (gnu_comp_size == 0 && TREE_CODE (tem) == RECORD_TYPE
1595 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1596 gnu_comp_size = max_size (TYPE_SIZE (tem), 1);
1598 if (! Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size != 0)
1600 tem = make_type_from_size (tem, gnu_comp_size, 0);
1601 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1602 "C_PAD", 0, definition, 1);
1605 if (Has_Volatile_Components (gnat_entity))
1606 tem = build_qualified_type (tem,
1607 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1609 /* If Component_Size is not already specified, annotate it with the
1610 size of the component. */
1611 if (Unknown_Component_Size (gnat_entity))
1612 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1614 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
1615 size_binop (MULT_EXPR, gnu_max_size,
1616 TYPE_SIZE_UNIT (tem)));
1617 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
1618 size_binop (MULT_EXPR,
1619 convert (bitsizetype,
1623 for (index = ndim - 1; index >= 0; index--)
1625 tem = build_array_type (tem, gnu_index_types[index]);
1626 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1628 /* If the type below this an multi-array type, then this
1629 does not not have aliased components.
1631 ??? Otherwise, for now, we say that any component of aggregate
1632 type is addressable because the front end may take 'Reference
1633 of it. But we have to make it addressable if it must be passed
1634 by reference or it that is the default. */
1635 TYPE_NONALIASED_COMPONENT (tem)
1636 = ((TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
1637 && TYPE_MULTI_ARRAY_P (TREE_TYPE (tem))) ? 1
1638 : (! Has_Aliased_Components (gnat_entity)
1639 && ! AGGREGATE_TYPE_P (TREE_TYPE (tem))));
1642 /* If an alignment is specified, use it if valid. But ignore it for
1643 types that represent the unpacked base type for packed arrays. */
1644 if (No (Packed_Array_Type (gnat_entity))
1645 && Known_Alignment (gnat_entity))
1647 if (No (Alignment (gnat_entity)))
1651 = validate_alignment (Alignment (gnat_entity), gnat_entity,
1655 TYPE_CONVENTION_FORTRAN_P (tem)
1656 = (Convention (gnat_entity) == Convention_Fortran);
1657 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
1659 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
1660 corresponding fat pointer. */
1661 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
1662 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
1663 TYPE_MODE (gnu_type) = BLKmode;
1664 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
1665 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
1667 /* If the maximum size doesn't overflow, use it. */
1668 if (TREE_CODE (gnu_max_size) == INTEGER_CST
1669 && ! TREE_OVERFLOW (gnu_max_size))
1671 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
1672 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
1673 && ! TREE_OVERFLOW (gnu_max_size_unit))
1674 TYPE_SIZE_UNIT (tem)
1675 = size_binop (MIN_EXPR, gnu_max_size_unit,
1676 TYPE_SIZE_UNIT (tem));
1678 create_type_decl (create_concat_name (gnat_entity, "XUA"),
1679 tem, 0, ! Comes_From_Source (gnat_entity),
1681 rest_of_type_compilation (gnu_fat_type, global_bindings_p ());
1683 /* Create a record type for the object and its template and
1684 set the template at a negative offset. */
1685 tem = build_unc_object_type (gnu_template_type, tem,
1686 create_concat_name (gnat_entity, "XUT"));
1687 DECL_FIELD_OFFSET (TYPE_FIELDS (tem))
1688 = size_binop (MINUS_EXPR, size_zero_node,
1689 byte_position (TREE_CHAIN (TYPE_FIELDS (tem))));
1690 DECL_FIELD_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem))) = size_zero_node;
1691 DECL_FIELD_BIT_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem)))
1692 = bitsize_zero_node;
1693 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
1694 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
1696 /* Give the thin pointer type a name. */
1697 create_type_decl (create_concat_name (gnat_entity, "XUX"),
1698 build_pointer_type (tem), 0,
1699 ! Comes_From_Source (gnat_entity), debug_info_p);
1703 case E_String_Subtype:
1704 case E_Array_Subtype:
1706 /* This is the actual data type for array variables. Multidimensional
1707 arrays are implemented in the gnu tree as arrays of arrays. Note
1708 that for the moment arrays which have sparse enumeration subtypes as
1709 index components create sparse arrays, which is obviously space
1710 inefficient but so much easier to code for now.
1712 Also note that the subtype never refers to the unconstrained
1713 array type, which is somewhat at variance with Ada semantics.
1715 First check to see if this is simply a renaming of the array
1716 type. If so, the result is the array type. */
1718 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1719 if (! Is_Constrained (gnat_entity))
1724 int array_dim = Number_Dimensions (gnat_entity);
1726 = ((Convention (gnat_entity) == Convention_Fortran)
1727 ? array_dim - 1 : 0);
1729 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
1730 Entity_Id gnat_ind_subtype;
1731 Entity_Id gnat_ind_base_subtype;
1732 tree gnu_base_type = gnu_type;
1733 tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
1734 tree gnu_comp_size = 0;
1735 tree gnu_max_size = size_one_node;
1736 tree gnu_max_size_unit;
1737 int need_index_type_struct = 0;
1738 int max_overflow = 0;
1740 /* First create the gnu types for each index. Create types for
1741 debugging information to point to the index types if the
1742 are not integer types, have variable bounds, or are
1743 wider than sizetype. */
1745 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
1746 gnat_ind_base_subtype
1747 = First_Index (Implementation_Base_Type (gnat_entity));
1748 index < array_dim && index >= 0;
1750 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1751 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1753 tree gnu_index_subtype
1754 = get_unpadded_type (Etype (gnat_ind_subtype));
1756 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
1758 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
1759 tree gnu_base_subtype
1760 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1762 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1764 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1765 tree gnu_base_type = get_base_type (gnu_base_subtype);
1766 tree gnu_base_base_min
1767 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
1768 tree gnu_base_base_max
1769 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
1773 /* If the minimum and maximum values both overflow in
1774 SIZETYPE, but the difference in the original type
1775 does not overflow in SIZETYPE, ignore the overflow
1777 if ((TYPE_PRECISION (gnu_index_subtype)
1778 > TYPE_PRECISION (sizetype))
1779 && TREE_CODE (gnu_min) == INTEGER_CST
1780 && TREE_CODE (gnu_max) == INTEGER_CST
1781 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
1783 (fold (build (MINUS_EXPR, gnu_index_subtype,
1784 TYPE_MAX_VALUE (gnu_index_subtype),
1785 TYPE_MIN_VALUE (gnu_index_subtype))))))
1786 TREE_OVERFLOW (gnu_min) = TREE_OVERFLOW (gnu_max)
1787 = TREE_CONSTANT_OVERFLOW (gnu_min)
1788 = TREE_CONSTANT_OVERFLOW (gnu_max) = 0;
1790 /* Similarly, if the range is null, use bounds of 1..0 for
1791 the sizetype bounds. */
1792 else if ((TYPE_PRECISION (gnu_index_subtype)
1793 > TYPE_PRECISION (sizetype))
1794 && TREE_CODE (gnu_min) == INTEGER_CST
1795 && TREE_CODE (gnu_max) == INTEGER_CST
1796 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
1797 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
1798 TYPE_MIN_VALUE (gnu_index_subtype)))
1799 gnu_min = size_one_node, gnu_max = size_zero_node;
1801 /* Now compute the size of this bound. We need to provide
1802 GCC with an upper bound to use but have to deal with the
1803 "superflat" case. There are three ways to do this. If we
1804 can prove that the array can never be superflat, we can
1805 just use the high bound of the index subtype. If we can
1806 prove that the low bound minus one can't overflow, we
1807 can do this as MAX (hb, lb - 1). Otherwise, we have to use
1808 the expression hb >= lb ? hb : lb - 1. */
1809 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
1811 /* See if the base array type is already flat. If it is, we
1812 are probably compiling an ACVC test, but it will cause the
1813 code below to malfunction if we don't handle it specially. */
1814 if (TREE_CODE (gnu_base_min) == INTEGER_CST
1815 && TREE_CODE (gnu_base_max) == INTEGER_CST
1816 && ! TREE_CONSTANT_OVERFLOW (gnu_base_min)
1817 && ! TREE_CONSTANT_OVERFLOW (gnu_base_max)
1818 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
1819 gnu_high = size_zero_node, gnu_min = size_one_node;
1821 /* If gnu_high is now an integer which overflowed, the array
1822 cannot be superflat. */
1823 else if (TREE_CODE (gnu_high) == INTEGER_CST
1824 && TREE_OVERFLOW (gnu_high))
1826 else if (TREE_UNSIGNED (gnu_base_subtype)
1827 || TREE_CODE (gnu_high) == INTEGER_CST)
1828 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
1832 (sizetype, build_binary_op (GE_EXPR, integer_type_node,
1836 gnu_index_type[index]
1837 = create_index_type (gnu_min, gnu_high, gnu_index_subtype);
1839 /* Also compute the maximum size of the array. Here we
1840 see if any constraint on the index type of the base type
1841 can be used in the case of self-referential bound on
1842 the index type of the subtype. We look for a non-"infinite"
1843 and non-self-referential bound from any type involved and
1844 handle each bound separately. */
1846 if ((TREE_CODE (gnu_min) == INTEGER_CST
1847 && ! TREE_OVERFLOW (gnu_min)
1848 && ! operand_equal_p (gnu_min, gnu_base_base_min, 0))
1849 || ! CONTAINS_PLACEHOLDER_P (gnu_min))
1850 gnu_base_min = gnu_min;
1852 if ((TREE_CODE (gnu_max) == INTEGER_CST
1853 && ! TREE_OVERFLOW (gnu_max)
1854 && ! operand_equal_p (gnu_max, gnu_base_base_max, 0))
1855 || ! CONTAINS_PLACEHOLDER_P (gnu_max))
1856 gnu_base_max = gnu_max;
1858 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
1859 && TREE_CONSTANT_OVERFLOW (gnu_base_min))
1860 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
1861 || (TREE_CODE (gnu_base_max) == INTEGER_CST
1862 && TREE_CONSTANT_OVERFLOW (gnu_base_max))
1863 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
1866 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
1867 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
1870 = size_binop (MAX_EXPR,
1871 size_binop (PLUS_EXPR, size_one_node,
1872 size_binop (MINUS_EXPR, gnu_base_max,
1876 if (TREE_CODE (gnu_this_max) == INTEGER_CST
1877 && TREE_CONSTANT_OVERFLOW (gnu_this_max))
1881 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
1883 if (! integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
1884 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
1886 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
1887 || (TREE_TYPE (gnu_index_subtype) != 0
1888 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
1890 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
1891 || (TYPE_PRECISION (gnu_index_subtype)
1892 > TYPE_PRECISION (sizetype)))
1893 need_index_type_struct = 1;
1896 /* Then flatten: create the array of arrays. */
1898 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
1900 /* One of the above calls might have caused us to be elaborated,
1901 so don't blow up if so. */
1902 if (present_gnu_tree (gnat_entity))
1908 /* Get and validate any specified Component_Size, but if Packed,
1909 ignore it since the front end will have taken care of it. */
1911 = validate_size (Component_Size (gnat_entity), gnu_type,
1913 (Is_Bit_Packed_Array (gnat_entity)
1914 ? TYPE_DECL : VAR_DECL),
1915 1, Has_Component_Size_Clause (gnat_entity));
1917 /* If the component type is a RECORD_TYPE that has a self-referential
1918 size, use the maxium size. */
1919 if (gnu_comp_size == 0 && TREE_CODE (gnu_type) == RECORD_TYPE
1920 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
1921 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), 1);
1923 if (! Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size != 0)
1925 gnu_type = make_type_from_size (gnu_type, gnu_comp_size, 0);
1926 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
1927 gnat_entity, "C_PAD", 0,
1931 if (Has_Volatile_Components (Base_Type (gnat_entity)))
1932 gnu_type = build_qualified_type (gnu_type,
1933 (TYPE_QUALS (gnu_type)
1934 | TYPE_QUAL_VOLATILE));
1936 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
1937 TYPE_SIZE_UNIT (gnu_type));
1938 gnu_max_size = size_binop (MULT_EXPR,
1939 convert (bitsizetype, gnu_max_size),
1940 TYPE_SIZE (gnu_type));
1942 for (index = array_dim - 1; index >= 0; index --)
1944 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
1945 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
1946 /* If the type below this an multi-array type, then this
1947 does not not have aliased components.
1949 ??? Otherwise, for now, we say that any component of aggregate
1950 type is addressable because the front end may take 'Reference
1951 of it. But we have to make it addressable if it must be passed
1952 by reference or it that is the default. */
1953 TYPE_NONALIASED_COMPONENT (gnu_type)
1954 = ((TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
1955 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) ? 1
1956 : (! Has_Aliased_Components (gnat_entity)
1957 && ! AGGREGATE_TYPE_P (TREE_TYPE (gnu_type))));
1960 /* If we are at file level and this is a multi-dimensional array, we
1961 need to make a variable corresponding to the stride of the
1962 inner dimensions. */
1963 if (global_bindings_p () && array_dim > 1)
1965 tree gnu_str_name = get_identifier ("ST");
1968 for (gnu_arr_type = TREE_TYPE (gnu_type);
1969 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
1970 gnu_arr_type = TREE_TYPE (gnu_arr_type),
1971 gnu_str_name = concat_id_with_name (gnu_str_name, "ST"))
1973 TYPE_SIZE (gnu_arr_type)
1974 = elaborate_expression_1 (gnat_entity, gnat_entity,
1975 TYPE_SIZE (gnu_arr_type),
1976 gnu_str_name, definition, 0);
1977 TYPE_SIZE_UNIT (gnu_arr_type)
1978 = elaborate_expression_1
1979 (gnat_entity, gnat_entity, TYPE_SIZE_UNIT (gnu_arr_type),
1980 concat_id_with_name (gnu_str_name, "U"), definition, 0);
1984 /* If we need to write out a record type giving the names of
1985 the bounds, do it now. */
1986 if (need_index_type_struct && debug_info_p)
1988 tree gnu_bound_rec_type = make_node (RECORD_TYPE);
1989 tree gnu_field_list = 0;
1992 TYPE_NAME (gnu_bound_rec_type)
1993 = create_concat_name (gnat_entity, "XA");
1995 for (index = array_dim - 1; index >= 0; index--)
1998 = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type[index]));
2000 if (TREE_CODE (gnu_type_name) == TYPE_DECL)
2001 gnu_type_name = DECL_NAME (gnu_type_name);
2003 gnu_field = create_field_decl (gnu_type_name,
2006 0, NULL_TREE, NULL_TREE, 0);
2007 TREE_CHAIN (gnu_field) = gnu_field_list;
2008 gnu_field_list = gnu_field;
2011 finish_record_type (gnu_bound_rec_type, gnu_field_list, 0, 0);
2014 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2015 = (Convention (gnat_entity) == Convention_Fortran);
2016 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2017 = Is_Packed_Array_Type (gnat_entity);
2019 /* If our size depends on a placeholder and the maximum size doesn't
2020 overflow, use it. */
2021 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2022 && ! (TREE_CODE (gnu_max_size) == INTEGER_CST
2023 && TREE_OVERFLOW (gnu_max_size))
2024 && ! (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2025 && TREE_OVERFLOW (gnu_max_size_unit))
2028 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2029 TYPE_SIZE (gnu_type));
2030 TYPE_SIZE_UNIT (gnu_type)
2031 = size_binop (MIN_EXPR, gnu_max_size_unit,
2032 TYPE_SIZE_UNIT (gnu_type));
2035 /* Set our alias set to that of our base type. This gives all
2036 array subtypes the same alias set. */
2037 copy_alias_set (gnu_type, gnu_base_type);
2040 /* If this is a packed type, make this type the same as the packed
2041 array type, but do some adjusting in the type first. */
2043 if (Present (Packed_Array_Type (gnat_entity)))
2045 Entity_Id gnat_index;
2046 tree gnu_inner_type;
2048 /* First finish the type we had been making so that we output
2049 debugging information for it */
2050 gnu_type = build_qualified_type (gnu_type,
2051 (TYPE_QUALS (gnu_type)
2052 | (TYPE_QUAL_VOLATILE
2053 * Treat_As_Volatile (gnat_entity))));
2054 set_lineno (gnat_entity, 0);
2055 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2056 ! Comes_From_Source (gnat_entity),
2058 if (! Comes_From_Source (gnat_entity))
2059 DECL_ARTIFICIAL (gnu_decl) = 1;
2061 /* Save it as our equivalent in case the call below elaborates
2063 save_gnu_tree (gnat_entity, gnu_decl, 0);
2065 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2068 gnu_inner_type = gnu_type = TREE_TYPE (gnu_decl);
2069 save_gnu_tree (gnat_entity, NULL_TREE, 0);
2071 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2072 && (TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_inner_type)
2073 || TYPE_IS_PADDING_P (gnu_inner_type)))
2074 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2076 /* We need to point the type we just made to our index type so
2077 the actual bounds can be put into a template. */
2079 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2080 && TYPE_ACTUAL_BOUNDS (gnu_inner_type) == 0)
2081 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2082 && ! TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2084 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2086 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2087 If it is, we need to make another type. */
2088 if (TYPE_MODULAR_P (gnu_inner_type))
2092 gnu_subtype = make_node (INTEGER_TYPE);
2094 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2095 TYPE_MIN_VALUE (gnu_subtype)
2096 = TYPE_MIN_VALUE (gnu_inner_type);
2097 TYPE_MAX_VALUE (gnu_subtype)
2098 = TYPE_MAX_VALUE (gnu_inner_type);
2099 TYPE_PRECISION (gnu_subtype)
2100 = TYPE_PRECISION (gnu_inner_type);
2101 TREE_UNSIGNED (gnu_subtype)
2102 = TREE_UNSIGNED (gnu_inner_type);
2103 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2104 layout_type (gnu_subtype);
2106 gnu_inner_type = gnu_subtype;
2109 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2112 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2114 for (gnat_index = First_Index (gnat_entity);
2115 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2116 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type,
2117 tree_cons (NULL_TREE,
2118 get_unpadded_type (Etype (gnat_index)),
2119 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2121 if (Convention (gnat_entity) != Convention_Fortran)
2122 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type,
2123 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2125 if (TREE_CODE (gnu_type) == RECORD_TYPE
2126 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type))
2127 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2131 /* Abort if packed array with no packed array type field set. */
2132 else if (Is_Packed (gnat_entity))
2137 case E_String_Literal_Subtype:
2138 /* Create the type for a string literal. */
2140 Entity_Id gnat_full_type
2141 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2142 && Present (Full_View (Etype (gnat_entity)))
2143 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2144 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2145 tree gnu_string_array_type
2146 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2147 tree gnu_string_index_type
2148 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2149 (TYPE_DOMAIN (gnu_string_array_type))));
2150 tree gnu_lower_bound
2151 = convert (gnu_string_index_type,
2152 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2153 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2154 tree gnu_length = ssize_int (length - 1);
2155 tree gnu_upper_bound
2156 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2158 convert (gnu_string_index_type, gnu_length));
2160 = build_range_type (gnu_string_index_type,
2161 gnu_lower_bound, gnu_upper_bound);
2163 = create_index_type (convert (sizetype,
2164 TYPE_MIN_VALUE (gnu_range_type)),
2166 TYPE_MAX_VALUE (gnu_range_type)),
2170 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2175 /* Record Types and Subtypes
2177 The following fields are defined on record types:
2179 Has_Discriminants True if the record has discriminants
2180 First_Discriminant Points to head of list of discriminants
2181 First_Entity Points to head of list of fields
2182 Is_Tagged_Type True if the record is tagged
2184 Implementation of Ada records and discriminated records:
2186 A record type definition is transformed into the equivalent of a C
2187 struct definition. The fields that are the discriminants which are
2188 found in the Full_Type_Declaration node and the elements of the
2189 Component_List found in the Record_Type_Definition node. The
2190 Component_List can be a recursive structure since each Variant of
2191 the Variant_Part of the Component_List has a Component_List.
2193 Processing of a record type definition comprises starting the list of
2194 field declarations here from the discriminants and the calling the
2195 function components_to_record to add the rest of the fields from the
2196 component list and return the gnu type node. The function
2197 components_to_record will call itself recursively as it traverses
2201 if (Has_Complex_Representation (gnat_entity))
2204 = build_complex_type
2206 (Etype (Defining_Entity
2207 (First (Component_Items
2210 (Declaration_Node (gnat_entity)))))))));
2216 Node_Id full_definition = Declaration_Node (gnat_entity);
2217 Node_Id record_definition = Type_Definition (full_definition);
2218 Entity_Id gnat_field;
2220 tree gnu_field_list = NULL_TREE;
2221 tree gnu_get_parent;
2222 int packed = (Is_Packed (gnat_entity) ? 1
2223 : (Component_Alignment (gnat_entity)
2224 == Calign_Storage_Unit) ? -1
2226 int has_rep = Has_Specified_Layout (gnat_entity);
2227 int all_rep = has_rep;
2229 = (Is_Tagged_Type (gnat_entity)
2230 && Nkind (record_definition) == N_Derived_Type_Definition);
2232 /* See if all fields have a rep clause. Stop when we find one
2234 for (gnat_field = First_Entity (gnat_entity);
2235 Present (gnat_field) && all_rep;
2236 gnat_field = Next_Entity (gnat_field))
2237 if ((Ekind (gnat_field) == E_Component
2238 || Ekind (gnat_field) == E_Discriminant)
2239 && No (Component_Clause (gnat_field)))
2242 /* If this is a record extension, go a level further to find the
2243 record definition. Also, verify we have a Parent_Subtype. */
2246 if (! type_annotate_only
2247 || Present (Record_Extension_Part (record_definition)))
2248 record_definition = Record_Extension_Part (record_definition);
2250 if (! type_annotate_only && No (Parent_Subtype (gnat_entity)))
2254 /* Make a node for the record. If we are not defining the record,
2255 suppress expanding incomplete types and save the node as the type
2256 for GNAT_ENTITY. We use the same RECORD_TYPE as for a dummy type
2257 and reset TYPE_DUMMY_P to show it's no longer a dummy.
2259 It is very tempting to delay resetting this bit until we are done
2260 with completing the type, e.g. to let possible intermediate
2261 elaboration of access types designating the record know it is not
2262 complete and arrange for update_pointer_to to fix things up later.
2264 It would be wrong, however, because dummy types are expected only
2265 to be created for Ada incomplete or private types, which is not
2266 what we have here. Doing so would make other parts of gigi think
2267 we are dealing with a really incomplete or private type, and have
2268 nasty side effects, typically on the generation of the associated
2269 debugging information. */
2270 gnu_type = make_dummy_type (gnat_entity);
2271 TYPE_DUMMY_P (gnu_type) = 0;
2273 if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL && debug_info_p)
2274 DECL_IGNORED_P (TYPE_NAME (gnu_type)) = 0;
2276 TYPE_ALIGN (gnu_type) = 0;
2277 TYPE_PACKED (gnu_type) = packed != 0 || has_rep;
2281 defer_incomplete_level++;
2283 set_lineno (gnat_entity, 0);
2284 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2285 ! Comes_From_Source (gnat_entity),
2287 save_gnu_tree (gnat_entity, gnu_decl, 0);
2288 this_made_decl = saved = 1;
2291 /* If both a size and rep clause was specified, put the size in
2292 the record type now so that it can get the proper mode. */
2293 if (has_rep && Known_Esize (gnat_entity))
2294 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2296 /* Always set the alignment here so that it can be used to
2297 set the mode, if it is making the alignment stricter. If
2298 it is invalid, it will be checked again below. If this is to
2299 be Atomic, choose a default alignment of a word unless we know
2300 the size and it's smaller. */
2301 if (Known_Alignment (gnat_entity))
2302 TYPE_ALIGN (gnu_type)
2303 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2304 else if (Is_Atomic (gnat_entity))
2305 TYPE_ALIGN (gnu_type)
2306 = (esize >= BITS_PER_WORD ? BITS_PER_WORD
2307 : 1 << ((floor_log2 (esize) - 1) + 1));
2309 /* If we have a Parent_Subtype, make a field for the parent. If
2310 this record has rep clauses, force the position to zero. */
2311 if (Present (Parent_Subtype (gnat_entity)))
2315 /* A major complexity here is that the parent subtype will
2316 reference our discriminants. But those must reference
2317 the parent component of this record. So here we will
2318 initialize each of those components to a COMPONENT_REF.
2319 The first operand of that COMPONENT_REF is another
2320 COMPONENT_REF which will be filled in below, once
2321 the parent type can be safely built. */
2323 gnu_get_parent = build (COMPONENT_REF, void_type_node,
2324 build (PLACEHOLDER_EXPR, gnu_type),
2325 build_decl (FIELD_DECL, NULL_TREE,
2328 if (Has_Discriminants (gnat_entity))
2329 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2330 Present (gnat_field);
2331 gnat_field = Next_Stored_Discriminant (gnat_field))
2332 if (Present (Corresponding_Discriminant (gnat_field)))
2335 build (COMPONENT_REF,
2336 get_unpadded_type (Etype (gnat_field)),
2338 gnat_to_gnu_entity (Corresponding_Discriminant
2343 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_entity));
2346 = create_field_decl (get_identifier
2347 (Get_Name_String (Name_uParent)),
2348 gnu_parent, gnu_type, 0,
2349 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2350 has_rep ? bitsize_zero_node : 0, 1);
2351 DECL_INTERNAL_P (gnu_field_list) = 1;
2353 TREE_TYPE (gnu_get_parent) = gnu_parent;
2354 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2357 /* Add the fields for the discriminants into the record. */
2358 if (! Is_Unchecked_Union (gnat_entity)
2359 && Has_Discriminants (gnat_entity))
2360 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2361 Present (gnat_field);
2362 gnat_field = Next_Stored_Discriminant (gnat_field))
2364 /* If this is a record extension and this discriminant
2365 is the renaming of another discriminant, we've already
2366 handled the discriminant above. */
2367 if (Present (Parent_Subtype (gnat_entity))
2368 && Present (Corresponding_Discriminant (gnat_field)))
2372 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2374 /* Make an expression using a PLACEHOLDER_EXPR from the
2375 FIELD_DECL node just created and link that with the
2376 corresponding GNAT defining identifier. Then add to the
2378 save_gnu_tree (gnat_field,
2379 build (COMPONENT_REF, TREE_TYPE (gnu_field),
2380 build (PLACEHOLDER_EXPR,
2381 DECL_CONTEXT (gnu_field)),
2385 TREE_CHAIN (gnu_field) = gnu_field_list;
2386 gnu_field_list = gnu_field;
2389 /* Put the discriminants into the record (backwards), so we can
2390 know the appropriate discriminant to use for the names of the
2392 TYPE_FIELDS (gnu_type) = gnu_field_list;
2394 /* Add the listed fields into the record and finish up. */
2395 components_to_record (gnu_type, Component_List (record_definition),
2396 gnu_field_list, packed, definition, 0,
2399 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2400 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2402 /* If this is an extension type, reset the tree for any
2403 inherited discriminants. Also remove the PLACEHOLDER_EXPR
2404 for non-inherited discriminants. */
2405 if (! Is_Unchecked_Union (gnat_entity)
2406 && Has_Discriminants (gnat_entity))
2407 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2408 Present (gnat_field);
2409 gnat_field = Next_Stored_Discriminant (gnat_field))
2411 if (Present (Parent_Subtype (gnat_entity))
2412 && Present (Corresponding_Discriminant (gnat_field)))
2413 save_gnu_tree (gnat_field, NULL_TREE, 0);
2416 gnu_field = get_gnu_tree (gnat_field);
2417 save_gnu_tree (gnat_field, NULL_TREE, 0);
2418 save_gnu_tree (gnat_field, TREE_OPERAND (gnu_field, 1), 0);
2422 /* If it is a tagged record force the type to BLKmode to insure
2423 that these objects will always be placed in memory. Do the
2424 same thing for limited record types. */
2425 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2426 TYPE_MODE (gnu_type) = BLKmode;
2428 /* If this is a derived type, we must make the alias set of this type
2429 the same as that of the type we are derived from. We assume here
2430 that the other type is already frozen. */
2431 if (Etype (gnat_entity) != gnat_entity
2432 && ! (Is_Private_Type (Etype (gnat_entity))
2433 && Full_View (Etype (gnat_entity)) == gnat_entity))
2434 copy_alias_set (gnu_type, gnat_to_gnu_type (Etype (gnat_entity)));
2436 /* Fill in locations of fields. */
2437 annotate_rep (gnat_entity, gnu_type);
2439 /* If there are any entities in the chain corresponding to
2440 components that we did not elaborate, ensure we elaborate their
2441 types if they are Itypes. */
2442 for (gnat_temp = First_Entity (gnat_entity);
2443 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2444 if ((Ekind (gnat_temp) == E_Component
2445 || Ekind (gnat_temp) == E_Discriminant)
2446 && Is_Itype (Etype (gnat_temp))
2447 && ! present_gnu_tree (gnat_temp))
2448 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2452 case E_Class_Wide_Subtype:
2453 /* If an equivalent type is present, that is what we should use.
2454 Otherwise, fall through to handle this like a record subtype
2455 since it may have constraints. */
2457 if (Present (Equivalent_Type (gnat_entity)))
2459 gnu_decl = gnat_to_gnu_entity (Equivalent_Type (gnat_entity),
2465 /* ... fall through ... */
2467 case E_Record_Subtype:
2469 /* If Cloned_Subtype is Present it means this record subtype has
2470 identical layout to that type or subtype and we should use
2471 that GCC type for this one. The front end guarantees that
2472 the component list is shared. */
2473 if (Present (Cloned_Subtype (gnat_entity)))
2475 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2480 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2481 changing the type, make a new type with each field having the
2482 type of the field in the new subtype but having the position
2483 computed by transforming every discriminant reference according
2484 to the constraints. We don't see any difference between
2485 private and nonprivate type here since derivations from types should
2486 have been deferred until the completion of the private type. */
2489 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2494 defer_incomplete_level++, this_deferred = 1;
2496 /* Get the base type initially for its alignment and sizes. But
2497 if it is a padded type, we do all the other work with the
2499 gnu_type = gnu_orig_type = gnu_base_type
2500 = gnat_to_gnu_type (gnat_base_type);
2502 if (TREE_CODE (gnu_type) == RECORD_TYPE
2503 && TYPE_IS_PADDING_P (gnu_type))
2504 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
2506 if (present_gnu_tree (gnat_entity))
2512 /* When the type has discriminants, and these discriminants
2513 affect the shape of what it built, factor them in.
2515 If we are making a subtype of an Unchecked_Union (must be an
2516 Itype), just return the type.
2518 We can't just use Is_Constrained because private subtypes without
2519 discriminants of full types with discriminants with default
2520 expressions are Is_Constrained but aren't constrained! */
2522 if (IN (Ekind (gnat_base_type), Record_Kind)
2523 && ! Is_For_Access_Subtype (gnat_entity)
2524 && ! Is_Unchecked_Union (gnat_base_type)
2525 && Is_Constrained (gnat_entity)
2526 && Stored_Constraint (gnat_entity) != No_Elist
2527 && Present (Discriminant_Constraint (gnat_entity)))
2529 Entity_Id gnat_field;
2530 Entity_Id gnat_root_type;
2531 tree gnu_field_list = 0;
2533 = compute_field_positions (gnu_orig_type, NULL_TREE,
2534 size_zero_node, bitsize_zero_node,
2537 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
2541 /* If this is a derived type, we may be seeing fields from any
2542 original records, so add those positions and discriminant
2543 substitutions to our lists. */
2544 for (gnat_root_type = gnat_base_type;
2545 Underlying_Type (Etype (gnat_root_type)) != gnat_root_type;
2546 gnat_root_type = Underlying_Type (Etype (gnat_root_type)))
2549 = compute_field_positions
2550 (gnat_to_gnu_type (Etype (gnat_root_type)),
2551 gnu_pos_list, size_zero_node, bitsize_zero_node,
2554 if (Present (Parent_Subtype (gnat_root_type)))
2556 = substitution_list (Parent_Subtype (gnat_root_type),
2557 Empty, gnu_subst_list, definition);
2560 gnu_type = make_node (RECORD_TYPE);
2561 TYPE_NAME (gnu_type) = gnu_entity_id;
2562 TYPE_STUB_DECL (gnu_type)
2563 = pushdecl (build_decl (TYPE_DECL, NULL_TREE, gnu_type));
2564 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2566 for (gnat_field = First_Entity (gnat_entity);
2567 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
2568 if (Ekind (gnat_field) == E_Component
2569 || Ekind (gnat_field) == E_Discriminant)
2572 = gnat_to_gnu_entity
2573 (Original_Record_Component (gnat_field), NULL_TREE, 0);
2575 = TREE_VALUE (purpose_member (gnu_old_field,
2577 tree gnu_pos = TREE_PURPOSE (gnu_offset);
2578 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
2580 = gnat_to_gnu_type (Etype (gnat_field));
2581 tree gnu_size = TYPE_SIZE (gnu_field_type);
2582 tree gnu_new_pos = 0;
2583 unsigned int offset_align
2584 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
2588 /* If there was a component clause, the field types must be
2589 the same for the type and subtype, so copy the data from
2590 the old field to avoid recomputation here. */
2591 if (Present (Component_Clause
2592 (Original_Record_Component (gnat_field))))
2594 gnu_size = DECL_SIZE (gnu_old_field);
2595 gnu_field_type = TREE_TYPE (gnu_old_field);
2598 /* If this was a bitfield, get the size from the old field.
2599 Also ensure the type can be placed into a bitfield. */
2600 else if (DECL_BIT_FIELD (gnu_old_field))
2602 gnu_size = DECL_SIZE (gnu_old_field);
2603 if (TYPE_MODE (gnu_field_type) == BLKmode
2604 && TREE_CODE (gnu_field_type) == RECORD_TYPE
2605 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
2606 gnu_field_type = make_packable_type (gnu_field_type);
2609 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
2610 for (gnu_temp = gnu_subst_list;
2611 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2612 gnu_pos = substitute_in_expr (gnu_pos,
2613 TREE_PURPOSE (gnu_temp),
2614 TREE_VALUE (gnu_temp));
2616 /* If the size is now a constant, we can set it as the
2617 size of the field when we make it. Otherwise, we need
2618 to deal with it specially. */
2619 if (TREE_CONSTANT (gnu_pos))
2620 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
2624 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
2625 0, gnu_size, gnu_new_pos,
2626 ! DECL_NONADDRESSABLE_P (gnu_old_field));
2628 if (! TREE_CONSTANT (gnu_pos))
2630 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
2631 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
2632 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
2633 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
2634 DECL_SIZE (gnu_field) = gnu_size;
2635 DECL_SIZE_UNIT (gnu_field)
2636 = convert (sizetype,
2637 size_binop (CEIL_DIV_EXPR, gnu_size,
2638 bitsize_unit_node));
2639 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
2642 DECL_INTERNAL_P (gnu_field)
2643 = DECL_INTERNAL_P (gnu_old_field);
2644 SET_DECL_ORIGINAL_FIELD (gnu_field,
2645 (DECL_ORIGINAL_FIELD (gnu_old_field) != 0
2646 ? DECL_ORIGINAL_FIELD (gnu_old_field)
2648 DECL_DISCRIMINANT_NUMBER (gnu_field)
2649 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
2650 TREE_THIS_VOLATILE (gnu_field)
2651 = TREE_THIS_VOLATILE (gnu_old_field);
2652 TREE_CHAIN (gnu_field) = gnu_field_list;
2653 gnu_field_list = gnu_field;
2654 save_gnu_tree (gnat_field, gnu_field, 0);
2657 finish_record_type (gnu_type, nreverse (gnu_field_list), 1, 0);
2659 /* Now set the size, alignment and alias set of the new type to
2660 match that of the old one, doing any substitutions, as
2662 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2663 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
2664 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
2665 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
2666 copy_alias_set (gnu_type, gnu_base_type);
2668 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2669 for (gnu_temp = gnu_subst_list;
2670 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2671 TYPE_SIZE (gnu_type)
2672 = substitute_in_expr (TYPE_SIZE (gnu_type),
2673 TREE_PURPOSE (gnu_temp),
2674 TREE_VALUE (gnu_temp));
2676 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
2677 for (gnu_temp = gnu_subst_list;
2678 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2679 TYPE_SIZE_UNIT (gnu_type)
2680 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
2681 TREE_PURPOSE (gnu_temp),
2682 TREE_VALUE (gnu_temp));
2684 if (TYPE_ADA_SIZE (gnu_type) != 0
2685 && CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
2686 for (gnu_temp = gnu_subst_list;
2687 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2688 SET_TYPE_ADA_SIZE (gnu_type,
2689 substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
2690 TREE_PURPOSE (gnu_temp),
2691 TREE_VALUE (gnu_temp)));
2693 /* Recompute the mode of this record type now that we know its
2695 compute_record_mode (gnu_type);
2697 /* Fill in locations of fields. */
2698 annotate_rep (gnat_entity, gnu_type);
2701 /* If we've made a new type, record it and make an XVS type to show
2702 what this is a subtype of. Some debuggers require the XVS
2703 type to be output first, so do it in that order. */
2704 if (gnu_type != gnu_orig_type)
2708 tree gnu_subtype_marker = make_node (RECORD_TYPE);
2709 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
2711 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
2712 gnu_orig_name = DECL_NAME (gnu_orig_name);
2714 TYPE_NAME (gnu_subtype_marker)
2715 = create_concat_name (gnat_entity, "XVS");
2716 finish_record_type (gnu_subtype_marker,
2717 create_field_decl (gnu_orig_name,
2725 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2726 TYPE_NAME (gnu_type) = gnu_entity_id;
2727 TYPE_STUB_DECL (gnu_type)
2728 = pushdecl (build_decl (TYPE_DECL, TYPE_NAME (gnu_type),
2730 DECL_ARTIFICIAL (TYPE_STUB_DECL (gnu_type)) = 1;
2731 DECL_IGNORED_P (TYPE_STUB_DECL (gnu_type)) = ! debug_info_p;
2732 rest_of_type_compilation (gnu_type, global_bindings_p ());
2735 /* Otherwise, go down all the components in the new type and
2736 make them equivalent to those in the base type. */
2738 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
2739 gnat_temp = Next_Entity (gnat_temp))
2740 if ((Ekind (gnat_temp) == E_Discriminant
2741 && ! Is_Unchecked_Union (gnat_base_type))
2742 || Ekind (gnat_temp) == E_Component)
2743 save_gnu_tree (gnat_temp,
2745 (Original_Record_Component (gnat_temp)), 0);
2749 case E_Access_Subprogram_Type:
2750 /* If we are not defining this entity, and we have incomplete
2751 entities being processed above us, make a dummy type and
2752 fill it in later. */
2753 if (! definition && defer_incomplete_level != 0)
2755 struct incomplete *p
2756 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
2759 = build_pointer_type
2760 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
2761 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2762 ! Comes_From_Source (gnat_entity),
2764 save_gnu_tree (gnat_entity, gnu_decl, 0);
2765 this_made_decl = saved = 1;
2767 p->old_type = TREE_TYPE (gnu_type);
2768 p->full_type = Directly_Designated_Type (gnat_entity);
2769 p->next = defer_incomplete_list;
2770 defer_incomplete_list = p;
2774 /* ... fall through ... */
2776 case E_Allocator_Type:
2778 case E_Access_Attribute_Type:
2779 case E_Anonymous_Access_Type:
2780 case E_General_Access_Type:
2782 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
2783 Entity_Id gnat_desig_full
2784 = ((IN (Ekind (Etype (gnat_desig_type)),
2785 Incomplete_Or_Private_Kind))
2786 ? Full_View (gnat_desig_type) : 0);
2787 /* We want to know if we'll be seeing the freeze node for any
2788 incomplete type we may be pointing to. */
2790 = (Present (gnat_desig_full)
2791 ? In_Extended_Main_Code_Unit (gnat_desig_full)
2792 : In_Extended_Main_Code_Unit (gnat_desig_type));
2795 tree gnu_desig_type = 0;
2796 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
2798 if (!targetm.valid_pointer_mode (p_mode))
2801 if (No (gnat_desig_full)
2802 && (Ekind (gnat_desig_type) == E_Class_Wide_Type
2803 || (Ekind (gnat_desig_type) == E_Class_Wide_Subtype
2804 && Present (Equivalent_Type (gnat_desig_type)))))
2806 if (Present (Equivalent_Type (gnat_desig_type)))
2808 gnat_desig_full = Equivalent_Type (gnat_desig_type);
2809 if (IN (Ekind (gnat_desig_full), Incomplete_Or_Private_Kind))
2810 gnat_desig_full = Full_View (gnat_desig_full);
2812 else if (IN (Ekind (Root_Type (gnat_desig_type)),
2813 Incomplete_Or_Private_Kind))
2814 gnat_desig_full = Full_View (Root_Type (gnat_desig_type));
2817 if (Present (gnat_desig_full) && Is_Concurrent_Type (gnat_desig_full))
2818 gnat_desig_full = Corresponding_Record_Type (gnat_desig_full);
2820 /* If either the designated type or its full view is an
2821 unconstrained array subtype, replace it with the type it's a
2822 subtype of. This avoids problems with multiple copies of
2823 unconstrained array types. */
2824 if (Ekind (gnat_desig_type) == E_Array_Subtype
2825 && ! Is_Constrained (gnat_desig_type))
2826 gnat_desig_type = Etype (gnat_desig_type);
2827 if (Present (gnat_desig_full)
2828 && Ekind (gnat_desig_full) == E_Array_Subtype
2829 && ! Is_Constrained (gnat_desig_full))
2830 gnat_desig_full = Etype (gnat_desig_full);
2832 /* If the designated type is a subtype of an incomplete record type,
2833 use the parent type to avoid order of elaboration issues. This
2834 can lose some code efficiency, but there is no alternative. */
2835 if (Present (gnat_desig_full)
2836 && Ekind (gnat_desig_full) == E_Record_Subtype
2837 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)
2838 gnat_desig_full = Etype (gnat_desig_full);
2840 /* If we are pointing to an incomplete type whose completion is an
2841 unconstrained array, make a fat pointer type instead of a pointer
2842 to VOID. The two types in our fields will be pointers to VOID and
2843 will be replaced in update_pointer_to. Similiarly, if the type
2844 itself is a dummy type or an unconstrained array. Also make
2845 a dummy TYPE_OBJECT_RECORD_TYPE in case we have any thin
2848 if ((Present (gnat_desig_full)
2849 && Is_Array_Type (gnat_desig_full)
2850 && ! Is_Constrained (gnat_desig_full))
2851 || (present_gnu_tree (gnat_desig_type)
2852 && TYPE_IS_DUMMY_P (TREE_TYPE
2853 (get_gnu_tree (gnat_desig_type)))
2854 && Is_Array_Type (gnat_desig_type)
2855 && ! Is_Constrained (gnat_desig_type))
2856 || (present_gnu_tree (gnat_desig_type)
2857 && (TREE_CODE (TREE_TYPE (get_gnu_tree (gnat_desig_type)))
2858 == UNCONSTRAINED_ARRAY_TYPE)
2859 && (TYPE_POINTER_TO (TREE_TYPE
2860 (get_gnu_tree (gnat_desig_type)))
2862 || (No (gnat_desig_full) && ! in_main_unit
2863 && defer_incomplete_level != 0
2864 && ! present_gnu_tree (gnat_desig_type)
2865 && Is_Array_Type (gnat_desig_type)
2866 && ! Is_Constrained (gnat_desig_type)))
2869 = (present_gnu_tree (gnat_desig_type)
2870 ? gnat_to_gnu_type (gnat_desig_type)
2871 : make_dummy_type (gnat_desig_type));
2874 /* Show the dummy we get will be a fat pointer. */
2875 got_fat_p = made_dummy = 1;
2877 /* If the call above got something that has a pointer, that
2878 pointer is our type. This could have happened either
2879 because the type was elaborated or because somebody
2880 else executed the code below. */
2881 gnu_type = TYPE_POINTER_TO (gnu_old);
2884 gnu_type = make_node (RECORD_TYPE);
2885 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
2886 TYPE_POINTER_TO (gnu_old) = gnu_type;
2888 set_lineno (gnat_entity, 0);
2890 = chainon (chainon (NULL_TREE,
2892 (get_identifier ("P_ARRAY"),
2893 ptr_void_type_node, gnu_type,
2895 create_field_decl (get_identifier ("P_BOUNDS"),
2897 gnu_type, 0, 0, 0, 0));
2899 /* Make sure we can place this into a register. */
2900 TYPE_ALIGN (gnu_type)
2901 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
2902 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
2903 finish_record_type (gnu_type, fields, 0, 1);
2905 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
2906 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
2907 = concat_id_with_name (get_entity_name (gnat_desig_type),
2909 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
2913 /* If we already know what the full type is, use it. */
2914 else if (Present (gnat_desig_full)
2915 && present_gnu_tree (gnat_desig_full))
2916 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
2918 /* Get the type of the thing we are to point to and build a pointer
2919 to it. If it is a reference to an incomplete or private type with a
2920 full view that is a record, make a dummy type node and get the
2921 actual type later when we have verified it is safe. */
2922 else if (! in_main_unit
2923 && ! present_gnu_tree (gnat_desig_type)
2924 && Present (gnat_desig_full)
2925 && ! present_gnu_tree (gnat_desig_full)
2926 && Is_Record_Type (gnat_desig_full))
2928 gnu_desig_type = make_dummy_type (gnat_desig_type);
2932 /* Likewise if we are pointing to a record or array and we are to defer
2933 elaborating incomplete types. We do this since this access type
2934 may be the full view of some private type. Note that the
2935 unconstrained array case is handled above. */
2936 else if ((! in_main_unit || imported_p) && defer_incomplete_level != 0
2937 && ! present_gnu_tree (gnat_desig_type)
2938 && ((Is_Record_Type (gnat_desig_type)
2939 || Is_Array_Type (gnat_desig_type))
2940 || (Present (gnat_desig_full)
2941 && (Is_Record_Type (gnat_desig_full)
2942 || Is_Array_Type (gnat_desig_full)))))
2944 gnu_desig_type = make_dummy_type (gnat_desig_type);
2947 else if (gnat_desig_type == gnat_entity)
2949 gnu_type = build_pointer_type_for_mode (make_node (VOID_TYPE),
2951 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
2954 gnu_desig_type = gnat_to_gnu_type (gnat_desig_type);
2956 /* It is possible that the above call to gnat_to_gnu_type resolved our
2957 type. If so, just return it. */
2958 if (present_gnu_tree (gnat_entity))
2964 /* If we have a GCC type for the designated type, possibly modify it
2965 if we are pointing only to constant objects and then make a pointer
2966 to it. Don't do this for unconstrained arrays. */
2967 if (gnu_type == 0 && gnu_desig_type != 0)
2969 if (Is_Access_Constant (gnat_entity)
2970 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
2973 = build_qualified_type
2975 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
2977 /* Some extra processing is required if we are building a
2978 pointer to an incomplete type (in the GCC sense). We might
2979 have such a type if we just made a dummy, or directly out
2980 of the call to gnat_to_gnu_type above if we are processing
2981 an access type for a record component designating the
2982 record type itself. */
2983 if (! COMPLETE_TYPE_P (gnu_desig_type))
2985 /* We must ensure that the pointer to variant we make will
2986 be processed by update_pointer_to when the initial type
2987 is completed. Pretend we made a dummy and let further
2988 processing act as usual. */
2991 /* We must ensure that update_pointer_to will not retrieve
2992 the dummy variant when building a properly qualified
2993 version of the complete type. We take advantage of the
2994 fact that get_qualified_type is requiring TYPE_NAMEs to
2995 match to influence build_qualified_type and then also
2996 update_pointer_to here. */
2997 TYPE_NAME (gnu_desig_type)
2998 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3002 gnu_type = build_pointer_type_for_mode (gnu_desig_type, p_mode);
3005 /* If we are not defining this object and we made a dummy pointer,
3006 save our current definition, evaluate the actual type, and replace
3007 the tentative type we made with the actual one. If we are to defer
3008 actually looking up the actual type, make an entry in the
3011 if (! in_main_unit && made_dummy)
3014 = TYPE_FAT_POINTER_P (gnu_type)
3015 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3017 if (esize == POINTER_SIZE
3018 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3020 = build_pointer_type
3021 (TYPE_OBJECT_RECORD_TYPE
3022 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3024 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3025 ! Comes_From_Source (gnat_entity),
3027 save_gnu_tree (gnat_entity, gnu_decl, 0);
3028 this_made_decl = saved = 1;
3030 if (defer_incomplete_level == 0)
3032 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3033 gnat_to_gnu_type (gnat_desig_type));
3034 /* Note that the call to gnat_to_gnu_type here might have
3035 updated gnu_old_type directly, in which case it is not a
3036 dummy type any more when we get into update_pointer_to.
3038 This may happen for instance when the designated type is a
3039 record type, because their elaboration starts with an
3040 initial node from make_dummy_type, which may yield the same
3041 node as the one we got.
3043 Besides, variants of this non-dummy type might have been
3044 created along the way. update_pointer_to is expected to
3045 properly take care of those situations. */
3049 struct incomplete *p
3050 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3052 p->old_type = gnu_old_type;
3053 p->full_type = gnat_desig_type;
3054 p->next = defer_incomplete_list;
3055 defer_incomplete_list = p;
3061 case E_Access_Protected_Subprogram_Type:
3062 if (type_annotate_only && No (Equivalent_Type (gnat_entity)))
3063 gnu_type = build_pointer_type (void_type_node);
3065 /* The runtime representation is the equivalent type. */
3066 gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
3068 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3069 && ! present_gnu_tree (Directly_Designated_Type (gnat_entity))
3070 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3071 && ! Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3072 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3077 case E_Access_Subtype:
3079 /* We treat this as identical to its base type; any constraint is
3080 meaningful only to the front end.
3082 The designated type must be elaborated as well, if it does
3083 not have its own freeze node. Designated (sub)types created
3084 for constrained components of records with discriminants are
3085 not frozen by the front end and thus not elaborated by gigi,
3086 because their use may appear before the base type is frozen,
3087 and because it is not clear that they are needed anywhere in
3088 Gigi. With the current model, there is no correct place where
3089 they could be elaborated. */
3091 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3092 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3093 && ! present_gnu_tree (Directly_Designated_Type (gnat_entity))
3094 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3095 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3097 /* If we are not defining this entity, and we have incomplete
3098 entities being processed above us, make a dummy type and
3099 elaborate it later. */
3100 if (! definition && defer_incomplete_level != 0)
3102 struct incomplete *p
3103 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3105 = build_pointer_type
3106 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3108 p->old_type = TREE_TYPE (gnu_ptr_type);
3109 p->full_type = Directly_Designated_Type (gnat_entity);
3110 p->next = defer_incomplete_list;
3111 defer_incomplete_list = p;
3114 (IN (Ekind (Base_Type (Directly_Designated_Type (gnat_entity))),
3115 Incomplete_Or_Private_Kind))
3118 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3125 /* Subprogram Entities
3127 The following access functions are defined for subprograms (functions
3130 First_Formal The first formal parameter.
3131 Is_Imported Indicates that the subprogram has appeared in
3132 an INTERFACE or IMPORT pragma. For now we
3133 assume that the external language is C.
3134 Is_Inlined True if the subprogram is to be inlined.
3136 In addition for function subprograms we have:
3138 Etype Return type of the function.
3140 Each parameter is first checked by calling must_pass_by_ref on its
3141 type to determine if it is passed by reference. For parameters which
3142 are copied in, if they are Ada IN OUT or OUT parameters, their return
3143 value becomes part of a record which becomes the return type of the
3144 function (C function - note that this applies only to Ada procedures
3145 so there is no Ada return type). Additional code to store back the
3146 parameters will be generated on the caller side. This transformation
3147 is done here, not in the front-end.
3149 The intended result of the transformation can be seen from the
3150 equivalent source rewritings that follow:
3152 struct temp {int a,b};
3153 procedure P (A,B: IN OUT ...) is temp P (int A,B) {
3155 end P; return {A,B};
3165 For subprogram types we need to perform mainly the same conversions to
3166 GCC form that are needed for procedures and function declarations. The
3167 only difference is that at the end, we make a type declaration instead
3168 of a function declaration. */
3170 case E_Subprogram_Type:
3174 /* The first GCC parameter declaration (a PARM_DECL node). The
3175 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3176 actually is the head of this parameter list. */
3177 tree gnu_param_list = NULL_TREE;
3178 /* The type returned by a function. If the subprogram is a procedure
3179 this type should be void_type_node. */
3180 tree gnu_return_type = void_type_node;
3181 /* List of fields in return type of procedure with copy in copy out
3183 tree gnu_field_list = NULL_TREE;
3184 /* Non-null for subprograms containing parameters passed by copy in
3185 copy out (Ada IN OUT or OUT parameters not passed by reference),
3186 in which case it is the list of nodes used to specify the values of
3187 the in out/out parameters that are returned as a record upon
3188 procedure return. The TREE_PURPOSE of an element of this list is
3189 a field of the record and the TREE_VALUE is the PARM_DECL
3190 corresponding to that field. This list will be saved in the
3191 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3192 tree gnu_return_list = NULL_TREE;
3193 Entity_Id gnat_param;
3194 int inline_flag = Is_Inlined (gnat_entity);
3195 int public_flag = Is_Public (gnat_entity);
3197 = (Is_Public (gnat_entity) && !definition) || imported_p;
3198 int pure_flag = Is_Pure (gnat_entity);
3199 int volatile_flag = No_Return (gnat_entity);
3200 int returns_by_ref = 0;
3201 int returns_unconstrained = 0;
3202 tree gnu_ext_name = create_concat_name (gnat_entity, 0);
3203 int has_copy_in_out = 0;
3206 if (kind == E_Subprogram_Type && ! definition)
3207 /* A parameter may refer to this type, so defer completion
3208 of any incomplete types. */
3209 defer_incomplete_level++, this_deferred = 1;
3211 /* If the subprogram has an alias, it is probably inherited, so
3212 we can use the original one. If the original "subprogram"
3213 is actually an enumeration literal, it may be the first use
3214 of its type, so we must elaborate that type now. */
3215 if (Present (Alias (gnat_entity)))
3217 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3218 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3220 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3223 /* Elaborate any Itypes in the parameters of this entity. */
3224 for (gnat_temp = First_Formal (gnat_entity);
3225 Present (gnat_temp);
3226 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3227 if (Is_Itype (Etype (gnat_temp)))
3228 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3233 if (kind == E_Function || kind == E_Subprogram_Type)
3234 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3236 /* If this function returns by reference, make the actual
3237 return type of this function the pointer and mark the decl. */
3238 if (Returns_By_Ref (gnat_entity))
3241 gnu_return_type = build_pointer_type (gnu_return_type);
3244 /* If the Mechanism is By_Reference, ensure the return type uses
3245 the machine's by-reference mechanism, which may not the same
3246 as above (e.g., it might be by passing a fake parameter). */
3247 else if (kind == E_Function
3248 && Mechanism (gnat_entity) == By_Reference)
3250 gnu_return_type = copy_type (gnu_return_type);
3251 TREE_ADDRESSABLE (gnu_return_type) = 1;
3254 /* If we are supposed to return an unconstrained array,
3255 actually return a fat pointer and make a note of that. Return
3256 a pointer to an unconstrained record of variable size. */
3257 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3259 gnu_return_type = TREE_TYPE (gnu_return_type);
3260 returns_unconstrained = 1;
3263 /* If the type requires a transient scope, the result is allocated
3264 on the secondary stack, so the result type of the function is
3266 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3268 gnu_return_type = build_pointer_type (gnu_return_type);
3269 returns_unconstrained = 1;
3272 /* If the type is a padded type and the underlying type would not
3273 be passed by reference or this function has a foreign convention,
3274 return the underlying type. */
3275 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3276 && TYPE_IS_PADDING_P (gnu_return_type)
3277 && (! default_pass_by_ref (TREE_TYPE
3278 (TYPE_FIELDS (gnu_return_type)))
3279 || Has_Foreign_Convention (gnat_entity)))
3280 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3282 /* Look at all our parameters and get the type of
3283 each. While doing this, build a copy-out structure if
3286 /* If the return type has a size that overflows, we cannot have
3287 a function that returns that type. This usage doesn't make
3288 sense anyway, so give an error here. */
3289 if (TYPE_SIZE_UNIT (gnu_return_type)
3290 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3292 post_error ("cannot return type whose size overflows",
3294 gnu_return_type = copy_node (gnu_return_type);
3295 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3296 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3297 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3298 TYPE_NEXT_VARIANT (gnu_return_type) = 0;
3301 for (gnat_param = First_Formal (gnat_entity), parmnum = 0;
3302 Present (gnat_param);
3303 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3305 tree gnu_param_name = get_entity_name (gnat_param);
3306 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3307 tree gnu_param, gnu_field;
3310 int by_component_ptr_p = 0;
3311 int copy_in_copy_out_flag = 0;
3312 int req_by_copy = 0, req_by_ref = 0;
3314 /* See if a Mechanism was supplied that forced this
3315 parameter to be passed one way or another. */
3316 if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3318 else if (Mechanism (gnat_param) == Default)
3320 else if (Mechanism (gnat_param) == By_Copy)
3322 else if (Mechanism (gnat_param) == By_Reference)
3324 else if (Mechanism (gnat_param) <= By_Descriptor)
3326 else if (Mechanism (gnat_param) > 0)
3328 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
3329 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
3330 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
3331 Mechanism (gnat_param)))
3337 post_error ("unsupported mechanism for&", gnat_param);
3339 /* If this is either a foreign function or if the
3340 underlying type won't be passed by refererence, strip off
3341 possible padding type. */
3342 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
3343 && TYPE_IS_PADDING_P (gnu_param_type)
3344 && (req_by_ref || Has_Foreign_Convention (gnat_entity)
3345 || ! must_pass_by_ref (TREE_TYPE (TYPE_FIELDS
3346 (gnu_param_type)))))
3347 gnu_param_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
3349 /* If this is an IN parameter it is read-only, so make a variant
3350 of the type that is read-only.
3352 ??? However, if this is an unconstrained array, that type can
3353 be very complex. So skip it for now. Likewise for any other
3354 self-referential type. */
3355 if (Ekind (gnat_param) == E_In_Parameter
3356 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
3357 && ! (TYPE_SIZE (gnu_param_type) != 0
3358 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))))
3360 = build_qualified_type (gnu_param_type,
3361 (TYPE_QUALS (gnu_param_type)
3362 | TYPE_QUAL_CONST));
3364 /* For foreign conventions, pass arrays as a pointer to the
3365 underlying type. First check for unconstrained array and get
3366 the underlying array. Then get the component type and build
3368 if (Has_Foreign_Convention (gnat_entity)
3369 && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
3371 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS
3372 (TREE_TYPE (gnu_param_type))));
3376 = build_pointer_type
3377 (build_vms_descriptor (gnu_param_type,
3378 Mechanism (gnat_param),
3381 else if (Has_Foreign_Convention (gnat_entity)
3383 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
3385 /* Strip off any multi-dimensional entries, then strip
3386 off the last array to get the component type. */
3387 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
3388 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
3389 gnu_param_type = TREE_TYPE (gnu_param_type);
3391 by_component_ptr_p = 1;
3392 gnu_param_type = TREE_TYPE (gnu_param_type);
3394 if (Ekind (gnat_param) == E_In_Parameter)
3396 = build_qualified_type (gnu_param_type,
3397 (TYPE_QUALS (gnu_param_type)
3398 | TYPE_QUAL_CONST));
3400 gnu_param_type = build_pointer_type (gnu_param_type);
3403 /* Fat pointers are passed as thin pointers for foreign
3405 else if (Has_Foreign_Convention (gnat_entity)
3406 && TYPE_FAT_POINTER_P (gnu_param_type))
3408 = make_type_from_size (gnu_param_type,
3409 size_int (POINTER_SIZE), 0);
3411 /* If we must pass or were requested to pass by reference, do so.
3412 If we were requested to pass by copy, do so.
3413 Otherwise, for foreign conventions, pass all in out parameters
3414 or aggregates by reference. For COBOL and Fortran, pass
3415 all integer and FP types that way too. For Convention Ada,
3416 use the standard Ada default. */
3417 else if (must_pass_by_ref (gnu_param_type) || req_by_ref
3419 && ((Has_Foreign_Convention (gnat_entity)
3420 && (Ekind (gnat_param) != E_In_Parameter
3421 || AGGREGATE_TYPE_P (gnu_param_type)))
3422 || (((Convention (gnat_entity)
3423 == Convention_Fortran)
3424 || (Convention (gnat_entity)
3425 == Convention_COBOL))
3426 && (INTEGRAL_TYPE_P (gnu_param_type)
3427 || FLOAT_TYPE_P (gnu_param_type)))
3428 /* For convention Ada, see if we pass by reference
3430 || (! Has_Foreign_Convention (gnat_entity)
3431 && default_pass_by_ref (gnu_param_type)))))
3433 gnu_param_type = build_reference_type (gnu_param_type);
3437 else if (Ekind (gnat_param) != E_In_Parameter)
3438 copy_in_copy_out_flag = 1;
3440 if (req_by_copy && (by_ref_p || by_component_ptr_p))
3441 post_error ("?cannot pass & by copy", gnat_param);
3443 /* If this is an OUT parameter that isn't passed by reference
3444 and isn't a pointer or aggregate, we don't make a PARM_DECL
3445 for it. Instead, it will be a VAR_DECL created when we process
3446 the procedure. For the special parameter of Valued_Procedure,
3449 An exception is made to cover the RM-6.4.1 rule requiring "by
3450 copy" out parameters with discriminants or implicit initial
3451 values to be handled like in out parameters. These type are
3452 normally built as aggregates, and hence passed by reference,
3453 except for some packed arrays which end up encoded in special
3456 The exception we need to make is then for packed arrays of
3457 records with discriminants or implicit initial values. We have
3458 no light/easy way to check for the latter case, so we merely
3459 check for packed arrays of records. This may lead to useless
3460 copy-in operations, but in very rare cases only, as these would
3461 be exceptions in a set of already exceptional situations. */
3462 if (Ekind (gnat_param) == E_Out_Parameter && ! by_ref_p
3463 && ((Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3465 && ! POINTER_TYPE_P (gnu_param_type)
3466 && ! AGGREGATE_TYPE_P (gnu_param_type)))
3467 && ! (Is_Array_Type (Etype (gnat_param))
3468 && Is_Packed (Etype (gnat_param))
3469 && Is_Composite_Type (Component_Type
3470 (Etype (gnat_param)))))
3474 set_lineno (gnat_param, 0);
3477 (gnu_param_name, gnu_param_type,
3478 by_ref_p || by_component_ptr_p
3479 || Ekind (gnat_param) == E_In_Parameter);
3481 DECL_BY_REF_P (gnu_param) = by_ref_p;
3482 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr_p;
3483 DECL_BY_DESCRIPTOR_P (gnu_param) = by_descr_p;
3484 DECL_POINTS_TO_READONLY_P (gnu_param)
3485 = (Ekind (gnat_param) == E_In_Parameter
3486 && (by_ref_p || by_component_ptr_p));
3487 save_gnu_tree (gnat_param, gnu_param, 0);
3488 gnu_param_list = chainon (gnu_param, gnu_param_list);
3490 /* If a parameter is a pointer, this function may modify
3491 memory through it and thus shouldn't be considered
3492 a pure function. Also, the memory may be modified
3493 between two calls, so they can't be CSE'ed. The latter
3494 case also handles by-ref parameters. */
3495 if (POINTER_TYPE_P (gnu_param_type)
3496 || TYPE_FAT_POINTER_P (gnu_param_type))
3500 if (copy_in_copy_out_flag)
3502 if (! has_copy_in_out)
3504 if (TREE_CODE (gnu_return_type) != VOID_TYPE)
3507 gnu_return_type = make_node (RECORD_TYPE);
3508 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
3509 has_copy_in_out = 1;
3512 set_lineno (gnat_param, 0);
3513 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
3514 gnu_return_type, 0, 0, 0, 0);
3515 TREE_CHAIN (gnu_field) = gnu_field_list;
3516 gnu_field_list = gnu_field;
3517 gnu_return_list = tree_cons (gnu_field, gnu_param,
3522 /* Do not compute record for out parameters if subprogram is
3523 stubbed since structures are incomplete for the back-end. */
3524 if (gnu_field_list != 0
3525 && Convention (gnat_entity) != Convention_Stubbed)
3526 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
3529 /* If we have a CICO list but it has only one entry, we convert
3530 this function into a function that simply returns that one
3532 if (list_length (gnu_return_list) == 1)
3533 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
3536 if (Convention (gnat_entity) == Convention_Stdcall)
3539 = (struct attrib *) xmalloc (sizeof (struct attrib));
3541 attr->next = attr_list;
3542 attr->type = ATTR_MACHINE_ATTRIBUTE;
3543 attr->name = get_identifier ("stdcall");
3544 attr->arg = NULL_TREE;
3545 attr->error_point = gnat_entity;
3550 /* Both lists ware built in reverse. */
3551 gnu_param_list = nreverse (gnu_param_list);
3552 gnu_return_list = nreverse (gnu_return_list);
3555 = create_subprog_type (gnu_return_type, gnu_param_list,
3556 gnu_return_list, returns_unconstrained,
3558 Function_Returns_With_DSP (gnat_entity));
3560 /* ??? For now, don't consider nested functions pure. */
3561 if (! global_bindings_p ())
3564 /* A subprogram (something that doesn't return anything) shouldn't
3565 be considered Pure since there would be no reason for such a
3566 subprogram. Note that procedures with Out (or In Out) parameters
3567 have already been converted into a function with a return type. */
3568 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
3572 = build_qualified_type (gnu_type,
3573 (TYPE_QUALS (gnu_type)
3574 | (TYPE_QUAL_CONST * pure_flag)
3575 | (TYPE_QUAL_VOLATILE * volatile_flag)));
3577 set_lineno (gnat_entity, 0);
3579 /* If there was no specified Interface_Name and the external and
3580 internal names of the subprogram are the same, only use the
3581 internal name to allow disambiguation of nested subprograms. */
3582 if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_id)
3585 /* If we are defining the subprogram and it has an Address clause
3586 we must get the address expression from the saved GCC tree for the
3587 subprogram if it has a Freeze_Node. Otherwise, we elaborate
3588 the address expression here since the front-end has guaranteed
3589 in that case that the elaboration has no effects. If there is
3590 an Address clause and we are not defining the object, just
3591 make it a constant. */
3592 if (Present (Address_Clause (gnat_entity)))
3594 tree gnu_address = 0;
3598 = (present_gnu_tree (gnat_entity)
3599 ? get_gnu_tree (gnat_entity)
3600 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
3602 save_gnu_tree (gnat_entity, NULL_TREE, 0);
3604 gnu_type = build_reference_type (gnu_type);
3605 if (gnu_address != 0)
3606 gnu_address = convert (gnu_type, gnu_address);
3609 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
3610 gnu_address, 0, Is_Public (gnat_entity),
3612 DECL_BY_REF_P (gnu_decl) = 1;
3615 else if (kind == E_Subprogram_Type)
3616 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3617 ! Comes_From_Source (gnat_entity),
3621 gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name,
3622 gnu_type, gnu_param_list,
3623 inline_flag, public_flag,
3624 extern_flag, attr_list);
3625 DECL_STUBBED_P (gnu_decl)
3626 = Convention (gnat_entity) == Convention_Stubbed;
3631 case E_Incomplete_Type:
3632 case E_Private_Type:
3633 case E_Limited_Private_Type:
3634 case E_Record_Type_With_Private:
3635 case E_Private_Subtype:
3636 case E_Limited_Private_Subtype:
3637 case E_Record_Subtype_With_Private:
3639 /* If this type does not have a full view in the unit we are
3640 compiling, then just get the type from its Etype. */
3641 if (No (Full_View (gnat_entity)))
3643 /* If this is an incomplete type with no full view, it must
3644 be a Taft Amendement type, so just return a dummy type. */
3645 if (kind == E_Incomplete_Type)
3646 gnu_type = make_dummy_type (gnat_entity);
3648 else if (Present (Underlying_Full_View (gnat_entity)))
3649 gnu_decl = gnat_to_gnu_entity (Underlying_Full_View (gnat_entity),
3653 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
3661 /* Otherwise, if we are not defining the type now, get the
3662 type from the full view. But always get the type from the full
3663 view for define on use types, since otherwise we won't see them! */
3665 else if (! definition
3666 || (Is_Itype (Full_View (gnat_entity))
3667 && No (Freeze_Node (gnat_entity)))
3668 || (Is_Itype (gnat_entity)
3669 && No (Freeze_Node (Full_View (gnat_entity)))))
3671 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
3677 /* For incomplete types, make a dummy type entry which will be
3679 gnu_type = make_dummy_type (gnat_entity);
3681 /* Save this type as the full declaration's type so we can do any needed
3682 updates when we see it. */
3683 set_lineno (gnat_entity, 0);
3684 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3685 ! Comes_From_Source (gnat_entity),
3687 save_gnu_tree (Full_View (gnat_entity), gnu_decl, 0);
3690 /* Simple class_wide types are always viewed as their root_type
3691 by Gigi unless an Equivalent_Type is specified. */
3692 case E_Class_Wide_Type:
3693 if (Present (Equivalent_Type (gnat_entity)))
3694 gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
3696 gnu_type = gnat_to_gnu_type (Root_Type (gnat_entity));
3702 case E_Task_Subtype:
3703 case E_Protected_Type:
3704 case E_Protected_Subtype:
3705 if (type_annotate_only && No (Corresponding_Record_Type (gnat_entity)))
3706 gnu_type = void_type_node;
3708 gnu_type = gnat_to_gnu_type (Corresponding_Record_Type (gnat_entity));
3714 gnu_decl = create_label_decl (gnu_entity_id);
3719 /* Nothing at all to do here, so just return an ERROR_MARK and claim
3720 we've already saved it, so we don't try to. */
3721 gnu_decl = error_mark_node;
3729 /* If we had a case where we evaluated another type and it might have
3730 defined this one, handle it here. */
3731 if (maybe_present && present_gnu_tree (gnat_entity))
3733 gnu_decl = get_gnu_tree (gnat_entity);
3737 /* If we are processing a type and there is either no decl for it or
3738 we just made one, do some common processing for the type, such as
3739 handling alignment and possible padding. */
3741 if ((gnu_decl == 0 || this_made_decl) && IN (kind, Type_Kind))
3743 if (Is_Tagged_Type (gnat_entity)
3744 || Is_Class_Wide_Equivalent_Type (gnat_entity))
3745 TYPE_ALIGN_OK (gnu_type) = 1;
3747 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
3748 TYPE_BY_REFERENCE_P (gnu_type) = 1;
3750 /* ??? Don't set the size for a String_Literal since it is either
3751 confirming or we don't handle it properly (if the low bound is
3753 if (gnu_size == 0 && kind != E_String_Literal_Subtype)
3754 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
3755 TYPE_DECL, 0, Has_Size_Clause (gnat_entity));
3757 /* If a size was specified, see if we can make a new type of that size
3758 by rearranging the type, for example from a fat to a thin pointer. */
3762 = make_type_from_size (gnu_type, gnu_size,
3763 Has_Biased_Representation (gnat_entity));
3765 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
3766 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
3770 /* If the alignment hasn't already been processed and this is
3771 not an unconstrained array, see if an alignment is specified.
3772 If not, we pick a default alignment for atomic objects. */
3773 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
3775 else if (Known_Alignment (gnat_entity))
3776 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
3777 TYPE_ALIGN (gnu_type));
3778 else if (Is_Atomic (gnat_entity) && gnu_size == 0
3779 && host_integerp (TYPE_SIZE (gnu_type), 1)
3780 && integer_pow2p (TYPE_SIZE (gnu_type)))
3781 align = MIN (BIGGEST_ALIGNMENT,
3782 tree_low_cst (TYPE_SIZE (gnu_type), 1));
3783 else if (Is_Atomic (gnat_entity) && gnu_size != 0
3784 && host_integerp (gnu_size, 1)
3785 && integer_pow2p (gnu_size))
3786 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
3788 /* See if we need to pad the type. If we did, and made a record,
3789 the name of the new type may be changed. So get it back for
3790 us when we make the new TYPE_DECL below. */
3791 gnu_type = maybe_pad_type (gnu_type, gnu_size, align,
3792 gnat_entity, "PAD", 1, definition, 0);
3793 if (TREE_CODE (gnu_type) == RECORD_TYPE
3794 && TYPE_IS_PADDING_P (gnu_type))
3796 gnu_entity_id = TYPE_NAME (gnu_type);
3797 if (TREE_CODE (gnu_entity_id) == TYPE_DECL)
3798 gnu_entity_id = DECL_NAME (gnu_entity_id);
3801 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
3803 /* If we are at global level, GCC will have applied variable_size to
3804 the type, but that won't have done anything. So, if it's not
3805 a constant or self-referential, call elaborate_expression_1 to
3806 make a variable for the size rather than calculating it each time.
3807 Handle both the RM size and the actual size. */
3808 if (global_bindings_p ()
3809 && TYPE_SIZE (gnu_type) != 0
3810 && ! TREE_CONSTANT (TYPE_SIZE (gnu_type))
3811 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3813 if (TREE_CODE (gnu_type) == RECORD_TYPE
3814 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
3815 TYPE_SIZE (gnu_type), 0))
3817 TYPE_SIZE (gnu_type)
3818 = elaborate_expression_1 (gnat_entity, gnat_entity,
3819 TYPE_SIZE (gnu_type),
3820 get_identifier ("SIZE"),
3822 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
3826 TYPE_SIZE (gnu_type)
3827 = elaborate_expression_1 (gnat_entity, gnat_entity,
3828 TYPE_SIZE (gnu_type),
3829 get_identifier ("SIZE"),
3832 /* ??? For now, store the size as a multiple of the alignment
3833 in bytes so that we can see the alignment from the tree. */
3834 TYPE_SIZE_UNIT (gnu_type)
3836 (MULT_EXPR, sizetype,
3837 elaborate_expression_1
3838 (gnat_entity, gnat_entity,
3839 build_binary_op (EXACT_DIV_EXPR, sizetype,
3840 TYPE_SIZE_UNIT (gnu_type),
3841 size_int (TYPE_ALIGN (gnu_type)
3843 get_identifier ("SIZE_A_UNIT"),
3845 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
3847 if (TREE_CODE (gnu_type) == RECORD_TYPE)
3848 SET_TYPE_ADA_SIZE (gnu_type,
3849 elaborate_expression_1 (gnat_entity, gnat_entity,
3850 TYPE_ADA_SIZE (gnu_type),
3851 get_identifier ("RM_SIZE"),
3856 /* If this is a record type or subtype, call elaborate_expression_1 on
3857 any field position. Do this for both global and local types.
3858 Skip any fields that we haven't made trees for to avoid problems with
3859 class wide types. */
3860 if (IN (kind, Record_Kind))
3861 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3862 gnat_temp = Next_Entity (gnat_temp))
3863 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
3865 tree gnu_field = get_gnu_tree (gnat_temp);
3867 /* ??? Unfortunately, GCC needs to be able to prove the
3868 alignment of this offset and if it's a variable, it can't.
3869 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
3870 right now, we have to put in an explicit multiply and
3871 divide by that value. */
3872 if (! CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
3873 DECL_FIELD_OFFSET (gnu_field)
3875 (MULT_EXPR, sizetype,
3876 elaborate_expression_1
3877 (gnat_temp, gnat_temp,
3878 build_binary_op (EXACT_DIV_EXPR, sizetype,
3879 DECL_FIELD_OFFSET (gnu_field),
3880 size_int (DECL_OFFSET_ALIGN (gnu_field)
3882 get_identifier ("OFFSET"),
3884 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
3887 gnu_type = build_qualified_type (gnu_type,
3888 (TYPE_QUALS (gnu_type)
3889 | (TYPE_QUAL_VOLATILE
3890 * Treat_As_Volatile (gnat_entity))));
3892 if (Is_Atomic (gnat_entity))
3893 check_ok_for_atomic (gnu_type, gnat_entity, 0);
3895 if (Known_Alignment (gnat_entity))
3896 TYPE_USER_ALIGN (gnu_type) = 1;
3900 set_lineno (gnat_entity, 0);
3901 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3902 ! Comes_From_Source (gnat_entity),
3906 TREE_TYPE (gnu_decl) = gnu_type;
3909 if (IN (kind, Type_Kind) && ! TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
3911 gnu_type = TREE_TYPE (gnu_decl);
3913 /* Back-annotate the Alignment of the type if not already in the
3914 tree. Likewise for sizes. */
3915 if (Unknown_Alignment (gnat_entity))
3916 Set_Alignment (gnat_entity,
3917 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
3919 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type) != 0)
3921 /* If the size is self-referential, we annotate the maximum
3922 value of that size. */
3923 tree gnu_size = TYPE_SIZE (gnu_type);
3925 if (CONTAINS_PLACEHOLDER_P (gnu_size))
3926 gnu_size = max_size (gnu_size, 1);
3928 Set_Esize (gnat_entity, annotate_value (gnu_size));
3930 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
3932 /* In this mode the tag and the parent components are not
3933 generated by the front-end, so the sizes must be adjusted
3939 if (Is_Derived_Type (gnat_entity))
3942 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
3943 Set_Alignment (gnat_entity,
3944 Alignment (Etype (Base_Type (gnat_entity))));
3947 size_offset = POINTER_SIZE;
3949 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
3950 Set_Esize (gnat_entity,
3951 UI_From_Int (((new_size + (POINTER_SIZE - 1))
3952 / POINTER_SIZE) * POINTER_SIZE));
3953 Set_RM_Size (gnat_entity, Esize (gnat_entity));
3957 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type) != 0)
3958 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
3961 if (! Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
3962 DECL_ARTIFICIAL (gnu_decl) = 1;
3964 if (! debug_info_p && DECL_P (gnu_decl)
3965 && TREE_CODE (gnu_decl) != FUNCTION_DECL)
3966 DECL_IGNORED_P (gnu_decl) = 1;
3968 /* If this decl is really indirect, adjust it. */
3969 if (TREE_CODE (gnu_decl) == VAR_DECL)
3970 adjust_decl_rtl (gnu_decl);
3972 /* If we haven't already, associate the ..._DECL node that we just made with
3973 the input GNAT entity node. */
3975 save_gnu_tree (gnat_entity, gnu_decl, 0);
3977 /* If this is an enumeral or floating-point type, we were not able to set
3978 the bounds since they refer to the type. These bounds are always static.
3980 For enumeration types, also write debugging information and declare the
3981 enumeration literal table, if needed. */
3983 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
3984 || (kind == E_Floating_Point_Type && ! Vax_Float (gnat_entity)))
3986 tree gnu_scalar_type = gnu_type;
3988 /* If this is a padded type, we need to use the underlying type. */
3989 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
3990 && TYPE_IS_PADDING_P (gnu_scalar_type))
3991 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
3993 /* If this is a floating point type and we haven't set a floating
3994 point type yet, use this in the evaluation of the bounds. */
3995 if (longest_float_type_node == 0 && kind == E_Floating_Point_Type)
3996 longest_float_type_node = gnu_type;
3998 TYPE_MIN_VALUE (gnu_scalar_type)
3999 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4000 TYPE_MAX_VALUE (gnu_scalar_type)
4001 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4003 if (kind == E_Enumeration_Type)
4005 TYPE_STUB_DECL (gnu_scalar_type) = gnu_decl;
4007 /* Since this has both a typedef and a tag, avoid outputting
4009 DECL_ARTIFICIAL (gnu_decl) = 1;
4010 rest_of_type_compilation (gnu_scalar_type, global_bindings_p ());
4014 /* If we deferred processing of incomplete types, re-enable it. If there
4015 were no other disables and we have some to process, do so. */
4016 if (this_deferred && --defer_incomplete_level == 0
4017 && defer_incomplete_list != 0)
4019 struct incomplete *incp = defer_incomplete_list;
4020 struct incomplete *next;
4022 defer_incomplete_list = 0;
4023 for (; incp; incp = next)
4027 if (incp->old_type != 0)
4028 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4029 gnat_to_gnu_type (incp->full_type));
4034 /* If we are not defining this type, see if it's in the incomplete list.
4035 If so, handle that list entry now. */
4036 else if (! definition)
4038 struct incomplete *incp;
4040 for (incp = defer_incomplete_list; incp; incp = incp->next)
4041 if (incp->old_type != 0 && incp->full_type == gnat_entity)
4043 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4044 TREE_TYPE (gnu_decl));
4052 if (Is_Packed_Array_Type (gnat_entity)
4053 && Is_Itype (Associated_Node_For_Itype (gnat_entity))
4054 && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity)))
4055 && ! present_gnu_tree (Associated_Node_For_Itype (gnat_entity)))
4056 gnat_to_gnu_entity (Associated_Node_For_Itype (gnat_entity), NULL_TREE, 0);
4061 /* Given GNAT_ENTITY, elaborate all expressions that are required to
4062 be elaborated at the point of its definition, but do nothing else. */
4065 elaborate_entity (Entity_Id gnat_entity)
4067 switch (Ekind (gnat_entity))
4069 case E_Signed_Integer_Subtype:
4070 case E_Modular_Integer_Subtype:
4071 case E_Enumeration_Subtype:
4072 case E_Ordinary_Fixed_Point_Subtype:
4073 case E_Decimal_Fixed_Point_Subtype:
4074 case E_Floating_Point_Subtype:
4076 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
4077 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
4079 /* ??? Tests for avoiding static constaint error expression
4080 is needed until the front stops generating bogus conversions
4081 on bounds of real types. */
4083 if (! Raises_Constraint_Error (gnat_lb))
4084 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
4085 1, 0, Needs_Debug_Info (gnat_entity));
4086 if (! Raises_Constraint_Error (gnat_hb))
4087 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
4088 1, 0, Needs_Debug_Info (gnat_entity));
4094 Node_Id full_definition = Declaration_Node (gnat_entity);
4095 Node_Id record_definition = Type_Definition (full_definition);
4097 /* If this is a record extension, go a level further to find the
4098 record definition. */
4099 if (Nkind (record_definition) == N_Derived_Type_Definition)
4100 record_definition = Record_Extension_Part (record_definition);
4104 case E_Record_Subtype:
4105 case E_Private_Subtype:
4106 case E_Limited_Private_Subtype:
4107 case E_Record_Subtype_With_Private:
4108 if (Is_Constrained (gnat_entity)
4109 && Has_Discriminants (Base_Type (gnat_entity))
4110 && Present (Discriminant_Constraint (gnat_entity)))
4112 Node_Id gnat_discriminant_expr;
4113 Entity_Id gnat_field;
4115 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
4116 gnat_discriminant_expr
4117 = First_Elmt (Discriminant_Constraint (gnat_entity));
4118 Present (gnat_field);
4119 gnat_field = Next_Discriminant (gnat_field),
4120 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
4121 /* ??? For now, ignore access discriminants. */
4122 if (! Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
4123 elaborate_expression (Node (gnat_discriminant_expr),
4125 get_entity_name (gnat_field), 1, 0, 0);
4132 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
4133 any entities on its entity chain similarly. */
4136 mark_out_of_scope (Entity_Id gnat_entity)
4138 Entity_Id gnat_sub_entity;
4139 unsigned int kind = Ekind (gnat_entity);
4141 /* If this has an entity list, process all in the list. */
4142 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
4143 || IN (kind, Private_Kind)
4144 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
4145 || kind == E_Function || kind == E_Generic_Function
4146 || kind == E_Generic_Package || kind == E_Generic_Procedure
4147 || kind == E_Loop || kind == E_Operator || kind == E_Package
4148 || kind == E_Package_Body || kind == E_Procedure
4149 || kind == E_Record_Type || kind == E_Record_Subtype
4150 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
4151 for (gnat_sub_entity = First_Entity (gnat_entity);
4152 Present (gnat_sub_entity);
4153 gnat_sub_entity = Next_Entity (gnat_sub_entity))
4154 if (Scope (gnat_sub_entity) == gnat_entity
4155 && gnat_sub_entity != gnat_entity)
4156 mark_out_of_scope (gnat_sub_entity);
4158 /* Now clear this if it has been defined, but only do so if it isn't
4159 a subprogram or parameter. We could refine this, but it isn't
4160 worth it. If this is statically allocated, it is supposed to
4161 hang around out of cope. */
4162 if (present_gnu_tree (gnat_entity) && ! Is_Statically_Allocated (gnat_entity)
4163 && kind != E_Procedure && kind != E_Function && ! IN (kind, Formal_Kind))
4165 save_gnu_tree (gnat_entity, NULL_TREE, 1);
4166 save_gnu_tree (gnat_entity, error_mark_node, 1);
4170 /* Set the alias set of GNU_NEW_TYPE to be that of GNU_OLD_TYPE. If this
4171 is a multi-dimensional array type, do this recursively. */
4174 copy_alias_set (tree gnu_new_type, tree gnu_old_type)
4176 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
4177 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
4178 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
4180 /* We need to be careful here in case GNU_OLD_TYPE is an unconstrained
4181 array. In that case, it doesn't have the same shape as GNU_NEW_TYPE,
4182 so we need to go down to what does. */
4183 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
4185 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
4187 copy_alias_set (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type));
4190 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
4191 record_component_aliases (gnu_new_type);
4194 /* Return a TREE_LIST describing the substitutions needed to reflect
4195 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
4196 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
4197 of GNAT_SUBTYPE. The substitions can be in any order. TREE_PURPOSE
4198 gives the tree for the discriminant and TREE_VALUES is the replacement
4199 value. They are in the form of operands to substitute_in_expr.
4200 DEFINITION is as in gnat_to_gnu_entity. */
4203 substitution_list (Entity_Id gnat_subtype,
4204 Entity_Id gnat_type,
4208 Entity_Id gnat_discrim;
4212 gnat_type = Implementation_Base_Type (gnat_subtype);
4214 if (Has_Discriminants (gnat_type))
4215 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
4216 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
4217 Present (gnat_discrim);
4218 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
4219 gnat_value = Next_Elmt (gnat_value))
4220 /* Ignore access discriminants. */
4221 if (! Is_Access_Type (Etype (Node (gnat_value))))
4222 gnu_list = tree_cons (gnat_to_gnu_entity (gnat_discrim, NULL_TREE, 0),
4223 elaborate_expression
4224 (Node (gnat_value), gnat_subtype,
4225 get_entity_name (gnat_discrim), definition,
4232 /* For the following two functions: for each GNAT entity, the GCC
4233 tree node used as a dummy for that entity, if any. */
4235 static GTY((length ("max_gnat_nodes"))) tree * dummy_node_table;
4237 /* Initialize the above table. */
4240 init_dummy_type (void)
4244 dummy_node_table = (tree *) ggc_alloc (max_gnat_nodes * sizeof (tree));
4246 for (gnat_node = 0; gnat_node < max_gnat_nodes; gnat_node++)
4247 dummy_node_table[gnat_node] = NULL_TREE;
4249 dummy_node_table -= First_Node_Id;
4252 /* Make a dummy type corresponding to GNAT_TYPE. */
4255 make_dummy_type (Entity_Id gnat_type)
4257 Entity_Id gnat_underlying;
4260 /* Find a full type for GNAT_TYPE, taking into account any class wide
4262 if (Is_Class_Wide_Type (gnat_type) && Present (Equivalent_Type (gnat_type)))
4263 gnat_type = Equivalent_Type (gnat_type);
4264 else if (Ekind (gnat_type) == E_Class_Wide_Type)
4265 gnat_type = Root_Type (gnat_type);
4267 for (gnat_underlying = gnat_type;
4268 (IN (Ekind (gnat_underlying), Incomplete_Or_Private_Kind)
4269 && Present (Full_View (gnat_underlying)));
4270 gnat_underlying = Full_View (gnat_underlying))
4273 /* If it there already a dummy type, use that one. Else make one. */
4274 if (dummy_node_table[gnat_underlying])
4275 return dummy_node_table[gnat_underlying];
4277 /* If this is a record, make this a RECORD_TYPE or UNION_TYPE; else make
4279 if (Is_Record_Type (gnat_underlying))
4280 gnu_type = make_node (Is_Unchecked_Union (gnat_underlying)
4281 ? UNION_TYPE : RECORD_TYPE);
4283 gnu_type = make_node (ENUMERAL_TYPE);
4285 TYPE_NAME (gnu_type) = get_entity_name (gnat_type);
4286 if (AGGREGATE_TYPE_P (gnu_type))
4287 TYPE_STUB_DECL (gnu_type)
4288 = pushdecl (build_decl (TYPE_DECL, NULL_TREE, gnu_type));
4290 TYPE_DUMMY_P (gnu_type) = 1;
4291 dummy_node_table[gnat_underlying] = gnu_type;
4296 /* Return 1 if the size represented by GNU_SIZE can be handled by an
4297 allocation. If STATIC_P is non-zero, consider only what can be
4298 done with a static allocation. */
4301 allocatable_size_p (tree gnu_size, int static_p)
4303 HOST_WIDE_INT our_size;
4305 /* If this is not a static allocation, the only case we want to forbid
4306 is an overflowing size. That will be converted into a raise a
4309 return ! (TREE_CODE (gnu_size) == INTEGER_CST
4310 && TREE_CONSTANT_OVERFLOW (gnu_size));
4312 /* Otherwise, we need to deal with both variable sizes and constant
4313 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
4314 since assemblers may not like very large sizes. */
4315 if (!host_integerp (gnu_size, 1))
4318 our_size = tree_low_cst (gnu_size, 1);
4319 return (int) our_size == our_size;
4322 /* Return a list of attributes for GNAT_ENTITY, if any. */
4324 static struct attrib *
4325 build_attr_list (Entity_Id gnat_entity)
4327 struct attrib *attr_list = 0;
4330 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
4331 gnat_temp = Next_Rep_Item (gnat_temp))
4332 if (Nkind (gnat_temp) == N_Pragma)
4334 struct attrib *attr;
4335 tree gnu_arg0 = 0, gnu_arg1 = 0;
4336 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
4337 enum attr_type etype;
4339 if (Present (gnat_assoc) && Present (First (gnat_assoc))
4340 && Present (Next (First (gnat_assoc)))
4341 && (Nkind (Expression (Next (First (gnat_assoc))))
4342 == N_String_Literal))
4344 gnu_arg0 = get_identifier (TREE_STRING_POINTER
4347 (First (gnat_assoc))))));
4348 if (Present (Next (Next (First (gnat_assoc))))
4349 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
4350 == N_String_Literal))
4351 gnu_arg1 = get_identifier (TREE_STRING_POINTER
4355 (First (gnat_assoc)))))));
4358 switch (Get_Pragma_Id (Chars (gnat_temp)))
4360 case Pragma_Machine_Attribute:
4361 etype = ATTR_MACHINE_ATTRIBUTE;
4364 case Pragma_Linker_Alias:
4365 etype = ATTR_LINK_ALIAS;
4368 case Pragma_Linker_Section:
4369 etype = ATTR_LINK_SECTION;
4372 case Pragma_Weak_External:
4373 etype = ATTR_WEAK_EXTERNAL;
4380 attr = (struct attrib *) xmalloc (sizeof (struct attrib));
4381 attr->next = attr_list;
4383 attr->name = gnu_arg0;
4384 attr->arg = gnu_arg1;
4386 = Present (Next (First (gnat_assoc)))
4387 ? Expression (Next (First (gnat_assoc))) : gnat_temp;
4394 /* Get the unpadded version of a GNAT type. */
4397 get_unpadded_type (Entity_Id gnat_entity)
4399 tree type = gnat_to_gnu_type (gnat_entity);
4401 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4402 type = TREE_TYPE (TYPE_FIELDS (type));
4407 /* Called when we need to protect a variable object using a save_expr. */
4410 maybe_variable (tree gnu_operand, Node_Id gnat_node)
4412 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
4413 || TREE_CODE (gnu_operand) == SAVE_EXPR
4414 || TREE_CODE (gnu_operand) == NULL_EXPR)
4417 /* If we will be generating code, make sure we are at the proper
4419 if (! global_bindings_p () && ! CONTAINS_PLACEHOLDER_P (gnu_operand))
4420 set_lineno (gnat_node, 1);
4422 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
4423 return build1 (UNCONSTRAINED_ARRAY_REF, TREE_TYPE (gnu_operand),
4424 variable_size (TREE_OPERAND (gnu_operand, 0)));
4426 return variable_size (gnu_operand);
4429 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
4430 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
4431 return the GCC tree to use for that expression. GNU_NAME is the
4432 qualification to use if an external name is appropriate and DEFINITION is
4433 nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero,
4434 we need a result. Otherwise, we are just elaborating this for
4435 side-effects. If NEED_DEBUG is nonzero we need the symbol for debugging
4436 purposes even if it isn't needed for code generation. */
4439 elaborate_expression (Node_Id gnat_expr,
4440 Entity_Id gnat_entity,
4448 /* If we already elaborated this expression (e.g., it was involved
4449 in the definition of a private type), use the old value. */
4450 if (present_gnu_tree (gnat_expr))
4451 return get_gnu_tree (gnat_expr);
4453 /* If we don't need a value and this is static or a discriment, we
4454 don't need to do anything. */
4455 else if (! need_value
4456 && (Is_OK_Static_Expression (gnat_expr)
4457 || (Nkind (gnat_expr) == N_Identifier
4458 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
4461 /* Otherwise, convert this tree to its GCC equivalant. */
4463 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
4464 gnu_name, definition, need_debug);
4466 /* Save the expression in case we try to elaborate this entity again.
4467 Since this is not a DECL, don't check it. If this is a constant,
4468 don't save it since GNAT_EXPR might be used more than once. Also,
4469 don't save if it's a discriminant. */
4470 if (! CONTAINS_PLACEHOLDER_P (gnu_expr))
4471 save_gnu_tree (gnat_expr, gnu_expr, 1);
4473 return need_value ? gnu_expr : error_mark_node;
4476 /* Similar, but take a GNU expression. */
4479 elaborate_expression_1 (Node_Id gnat_expr,
4480 Entity_Id gnat_entity,
4487 /* Strip any conversions to see if the expression is a readonly variable.
4488 ??? This really should remain readonly, but we have to think about
4489 the typing of the tree here. */
4490 tree gnu_inner_expr = remove_conversions (gnu_expr, 1);
4491 int expr_global = Is_Public (gnat_entity) || global_bindings_p ();
4494 /* In most cases, we won't see a naked FIELD_DECL here because a
4495 discriminant reference will have been replaced with a COMPONENT_REF
4496 when the type is being elaborated. However, there are some cases
4497 involving child types where we will. So convert it to a COMPONENT_REF
4498 here. We have to hope it will be at the highest level of the
4499 expression in these cases. */
4500 if (TREE_CODE (gnu_expr) == FIELD_DECL)
4501 gnu_expr = build (COMPONENT_REF, TREE_TYPE (gnu_expr),
4502 build (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
4505 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
4506 that is a constant, make a variable that is initialized to contain the
4507 bound when the package containing the definition is elaborated. If
4508 this entity is defined at top level and a bound or discriminant value
4509 isn't a constant or a reference to a discriminant, replace the bound
4510 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
4511 rely here on the fact that an expression cannot contain both the
4512 discriminant and some other variable. */
4514 expr_variable = (TREE_CODE_CLASS (TREE_CODE (gnu_expr)) != 'c'
4515 && ! (TREE_CODE (gnu_inner_expr) == VAR_DECL
4516 && TREE_READONLY (gnu_inner_expr))
4517 && ! CONTAINS_PLACEHOLDER_P (gnu_expr));
4519 /* If this is a static expression or contains a discriminant, we don't
4520 need the variable for debugging (and can't elaborate anyway if a
4523 && (Is_OK_Static_Expression (gnat_expr)
4524 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
4527 /* Now create the variable if we need it. */
4528 if (need_debug || (expr_variable && expr_global))
4530 set_lineno (gnat_entity, ! global_bindings_p ());
4532 = create_var_decl (create_concat_name (gnat_entity,
4533 IDENTIFIER_POINTER (gnu_name)),
4534 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, 1,
4535 Is_Public (gnat_entity), ! definition, 0, 0);
4538 /* We only need to use this variable if we are in global context since GCC
4539 can do the right thing in the local case. */
4540 if (expr_global && expr_variable)
4542 else if (! expr_variable)
4545 return maybe_variable (gnu_expr, gnat_expr);
4548 /* Create a record type that contains a field of TYPE with a starting bit
4549 position so that it is aligned to ALIGN bits and is SIZE bytes long. */
4552 make_aligning_type (tree type, int align, tree size)
4554 tree record_type = make_node (RECORD_TYPE);
4555 tree place = build (PLACEHOLDER_EXPR, record_type);
4556 tree size_addr_place = convert (sizetype,
4557 build_unary_op (ADDR_EXPR, NULL_TREE,
4559 tree name = TYPE_NAME (type);
4562 if (TREE_CODE (name) == TYPE_DECL)
4563 name = DECL_NAME (name);
4565 TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN");
4567 /* The bit position is obtained by "and"ing the alignment minus 1
4568 with the two's complement of the address and multiplying
4569 by the number of bits per unit. Do all this in sizetype. */
4571 pos = size_binop (MULT_EXPR,
4572 convert (bitsizetype,
4573 size_binop (BIT_AND_EXPR,
4574 size_diffop (size_zero_node,
4576 ssize_int ((align / BITS_PER_UNIT)
4580 field = create_field_decl (get_identifier ("F"), type, record_type,
4582 DECL_BIT_FIELD (field) = 0;
4584 finish_record_type (record_type, field, 1, 0);
4585 TYPE_ALIGN (record_type) = BIGGEST_ALIGNMENT;
4586 TYPE_SIZE (record_type)
4587 = size_binop (PLUS_EXPR,
4588 size_binop (MULT_EXPR, convert (bitsizetype, size),
4590 bitsize_int (align));
4591 TYPE_SIZE_UNIT (record_type)
4592 = size_binop (PLUS_EXPR, size, size_int (align / BITS_PER_UNIT));
4593 copy_alias_set (record_type, type);
4597 /* TYPE is a RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE, with BLKmode that's
4598 being used as the field type of a packed record. See if we can rewrite it
4599 as a record that has a non-BLKmode type, which we can pack tighter. If so,
4600 return the new type. If not, return the original type. */
4603 make_packable_type (tree type)
4605 tree new_type = make_node (TREE_CODE (type));
4606 tree field_list = NULL_TREE;
4609 /* Copy the name and flags from the old type to that of the new and set
4610 the alignment to try for an integral type. For QUAL_UNION_TYPE,
4611 also copy the size. */
4612 TYPE_NAME (new_type) = TYPE_NAME (type);
4613 TYPE_LEFT_JUSTIFIED_MODULAR_P (new_type)
4614 = TYPE_LEFT_JUSTIFIED_MODULAR_P (type);
4615 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
4616 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
4617 if (TREE_CODE (type) == QUAL_UNION_TYPE)
4619 TYPE_SIZE (new_type) = TYPE_SIZE (type);
4620 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
4623 TYPE_ALIGN (new_type)
4624 = ((HOST_WIDE_INT) 1
4625 << (floor_log2 (tree_low_cst (TYPE_SIZE (type), 1) - 1) + 1));
4627 /* Now copy the fields, keeping the position and size. */
4628 for (old_field = TYPE_FIELDS (type); old_field != 0;
4629 old_field = TREE_CHAIN (old_field))
4631 tree new_field_type = TREE_TYPE (old_field);
4634 if (TYPE_MODE (new_field_type) == BLKmode
4635 && (TREE_CODE (new_field_type) == RECORD_TYPE
4636 || TREE_CODE (new_field_type) == UNION_TYPE
4637 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
4638 && host_integerp (TYPE_SIZE (new_field_type), 1))
4639 new_field_type = make_packable_type (new_field_type);
4641 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
4642 new_type, TYPE_PACKED (type),
4643 DECL_SIZE (old_field),
4644 bit_position (old_field),
4645 ! DECL_NONADDRESSABLE_P (old_field));
4647 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
4648 SET_DECL_ORIGINAL_FIELD (new_field,
4649 (DECL_ORIGINAL_FIELD (old_field) != 0
4650 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
4652 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
4653 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
4655 TREE_CHAIN (new_field) = field_list;
4656 field_list = new_field;
4659 finish_record_type (new_type, nreverse (field_list), 1, 1);
4660 copy_alias_set (new_type, type);
4661 return TYPE_MODE (new_type) == BLKmode ? type : new_type;
4664 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
4665 if needed. We have already verified that SIZE and TYPE are large enough.
4667 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
4670 IS_USER_TYPE is nonzero if we must be sure we complete the original type.
4672 DEFINITION is nonzero if this type is being defined.
4674 SAME_RM_SIZE is nonzero if the RM_Size of the resulting type is to be
4675 set to its TYPE_SIZE; otherwise, it's set to the RM_Size of the original
4679 maybe_pad_type (tree type,
4682 Entity_Id gnat_entity,
4683 const char *name_trailer,
4688 tree orig_size = TYPE_SIZE (type);
4692 /* If TYPE is a padded type, see if it agrees with any size and alignment
4693 we were given. If so, return the original type. Otherwise, strip
4694 off the padding, since we will either be returning the inner type
4695 or repadding it. If no size or alignment is specified, use that of
4696 the original padded type. */
4698 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4701 || operand_equal_p (round_up (size,
4702 MAX (align, TYPE_ALIGN (type))),
4703 round_up (TYPE_SIZE (type),
4704 MAX (align, TYPE_ALIGN (type))),
4706 && (align == 0 || align == TYPE_ALIGN (type)))
4710 size = TYPE_SIZE (type);
4712 align = TYPE_ALIGN (type);
4714 type = TREE_TYPE (TYPE_FIELDS (type));
4715 orig_size = TYPE_SIZE (type);
4718 /* If the size is either not being changed or is being made smaller (which
4719 is not done here (and is only valid for bitfields anyway), show the size
4720 isn't changing. Likewise, clear the alignment if it isn't being
4721 changed. Then return if we aren't doing anything. */
4724 && (operand_equal_p (size, orig_size, 0)
4725 || (TREE_CODE (orig_size) == INTEGER_CST
4726 && tree_int_cst_lt (size, orig_size))))
4729 if (align == TYPE_ALIGN (type))
4732 if (align == 0 && size == 0)
4735 /* We used to modify the record in place in some cases, but that could
4736 generate incorrect debugging information. So make a new record
4738 record = make_node (RECORD_TYPE);
4740 if (Present (gnat_entity))
4741 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
4743 /* If we were making a type, complete the original type and give it a
4746 create_type_decl (get_entity_name (gnat_entity), type,
4747 0, ! Comes_From_Source (gnat_entity),
4748 ! (TYPE_NAME (type) != 0
4749 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
4750 && DECL_IGNORED_P (TYPE_NAME (type))));
4752 /* If we are changing the alignment and the input type is a record with
4753 BLKmode and a small constant size, try to make a form that has an
4754 integral mode. That might allow this record to have an integral mode,
4755 which will be much more efficient. There is no point in doing this if a
4756 size is specified unless it is also smaller than the biggest alignment
4757 and it is incorrect to do this if the size of the original type is not a
4758 multiple of the alignment. */
4760 && TREE_CODE (type) == RECORD_TYPE
4761 && TYPE_MODE (type) == BLKmode
4762 && host_integerp (orig_size, 1)
4763 && compare_tree_int (orig_size, BIGGEST_ALIGNMENT) <= 0
4765 || (TREE_CODE (size) == INTEGER_CST
4766 && compare_tree_int (size, BIGGEST_ALIGNMENT) <= 0))
4767 && tree_low_cst (orig_size, 1) % align == 0)
4768 type = make_packable_type (type);
4770 field = create_field_decl (get_identifier ("F"), type, record, 0,
4771 NULL_TREE, bitsize_zero_node, 1);
4773 DECL_INTERNAL_P (field) = 1;
4774 TYPE_SIZE (record) = size != 0 ? size : orig_size;
4775 TYPE_SIZE_UNIT (record)
4776 = convert (sizetype,
4777 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
4778 bitsize_unit_node));
4779 TYPE_ALIGN (record) = align;
4780 TYPE_IS_PADDING_P (record) = 1;
4781 TYPE_VOLATILE (record)
4782 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
4783 finish_record_type (record, field, 1, 0);
4785 /* Keep the RM_Size of the padded record as that of the old record
4787 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : rm_size (type));
4789 /* Unless debugging information isn't being written for the input type,
4790 write a record that shows what we are a subtype of and also make a
4791 variable that indicates our size, if variable. */
4792 if (TYPE_NAME (record) != 0
4793 && AGGREGATE_TYPE_P (type)
4794 && (TREE_CODE (TYPE_NAME (type)) != TYPE_DECL
4795 || ! DECL_IGNORED_P (TYPE_NAME (type))))
4797 tree marker = make_node (RECORD_TYPE);
4798 tree name = DECL_NAME (TYPE_NAME (record));
4799 tree orig_name = TYPE_NAME (type);
4801 if (TREE_CODE (orig_name) == TYPE_DECL)
4802 orig_name = DECL_NAME (orig_name);
4804 TYPE_NAME (marker) = concat_id_with_name (name, "XVS");
4805 finish_record_type (marker,
4806 create_field_decl (orig_name, integer_type_node,
4807 marker, 0, NULL_TREE, NULL_TREE,
4811 if (size != 0 && TREE_CODE (size) != INTEGER_CST && definition)
4812 create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE,
4813 sizetype, TYPE_SIZE (record), 0, 0, 0, 0,
4819 if (CONTAINS_PLACEHOLDER_P (orig_size))
4820 orig_size = max_size (orig_size, 1);
4822 /* If the size was widened explicitly, maybe give a warning. */
4823 if (size != 0 && Present (gnat_entity)
4824 && ! operand_equal_p (size, orig_size, 0)
4825 && ! (TREE_CODE (size) == INTEGER_CST
4826 && TREE_CODE (orig_size) == INTEGER_CST
4827 && tree_int_cst_lt (size, orig_size)))
4829 Node_Id gnat_error_node = Empty;
4831 if (Is_Packed_Array_Type (gnat_entity))
4832 gnat_entity = Associated_Node_For_Itype (gnat_entity);
4834 if ((Ekind (gnat_entity) == E_Component
4835 || Ekind (gnat_entity) == E_Discriminant)
4836 && Present (Component_Clause (gnat_entity)))
4837 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
4838 else if (Present (Size_Clause (gnat_entity)))
4839 gnat_error_node = Expression (Size_Clause (gnat_entity));
4841 /* Generate message only for entities that come from source, since
4842 if we have an entity created by expansion, the message will be
4843 generated for some other corresponding source entity. */
4844 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
4845 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
4847 size_diffop (size, orig_size));
4849 else if (*name_trailer == 'C' && ! Is_Internal (gnat_entity))
4850 post_error_ne_tree ("component of& padded{ by ^ bits}?",
4851 gnat_entity, gnat_entity,
4852 size_diffop (size, orig_size));
4858 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
4859 the value passed against the list of choices. */
4862 choices_to_gnu (tree operand, Node_Id choices)
4866 tree result = integer_zero_node;
4867 tree this_test, low = 0, high = 0, single = 0;
4869 for (choice = First (choices); Present (choice); choice = Next (choice))
4871 switch (Nkind (choice))
4874 low = gnat_to_gnu (Low_Bound (choice));
4875 high = gnat_to_gnu (High_Bound (choice));
4877 /* There's no good type to use here, so we might as well use
4878 integer_type_node. */
4880 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4881 build_binary_op (GE_EXPR, integer_type_node,
4883 build_binary_op (LE_EXPR, integer_type_node,
4888 case N_Subtype_Indication:
4889 gnat_temp = Range_Expression (Constraint (choice));
4890 low = gnat_to_gnu (Low_Bound (gnat_temp));
4891 high = gnat_to_gnu (High_Bound (gnat_temp));
4894 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4895 build_binary_op (GE_EXPR, integer_type_node,
4897 build_binary_op (LE_EXPR, integer_type_node,
4902 case N_Expanded_Name:
4903 /* This represents either a subtype range, an enumeration
4904 literal, or a constant Ekind says which. If an enumeration
4905 literal or constant, fall through to the next case. */
4906 if (Ekind (Entity (choice)) != E_Enumeration_Literal
4907 && Ekind (Entity (choice)) != E_Constant)
4909 tree type = gnat_to_gnu_type (Entity (choice));
4911 low = TYPE_MIN_VALUE (type);
4912 high = TYPE_MAX_VALUE (type);
4915 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4916 build_binary_op (GE_EXPR, integer_type_node,
4918 build_binary_op (LE_EXPR, integer_type_node,
4922 /* ... fall through ... */
4923 case N_Character_Literal:
4924 case N_Integer_Literal:
4925 single = gnat_to_gnu (choice);
4926 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
4930 case N_Others_Choice:
4931 this_test = integer_one_node;
4938 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
4945 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
4946 placed in GNU_RECORD_TYPE.
4948 PACKED is 1 if the enclosing record is packed and -1 if the enclosing
4949 record has a Component_Alignment of Storage_Unit.
4951 DEFINITION is nonzero if this field is for a record being defined. */
4954 gnat_to_gnu_field (Entity_Id gnat_field,
4955 tree gnu_record_type,
4959 tree gnu_field_id = get_entity_name (gnat_field);
4960 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
4961 tree gnu_orig_field_type = gnu_field_type;
4965 int needs_strict_alignment
4966 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
4967 || Treat_As_Volatile (gnat_field));
4969 /* If this field requires strict alignment or contains an item of
4970 variable sized, pretend it isn't packed. */
4971 if (needs_strict_alignment || is_variable_size (gnu_field_type))
4974 /* For packed records, this is one of the few occasions on which we use
4975 the official RM size for discrete or fixed-point components, instead
4976 of the normal GNAT size stored in Esize. See description in Einfo:
4977 "Handling of Type'Size Values" for further details. */
4980 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
4981 gnat_field, FIELD_DECL, 0, 1);
4983 if (Known_Static_Esize (gnat_field))
4984 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
4985 gnat_field, FIELD_DECL, 0, 1);
4987 /* If the field's type is left-justified modular, the wrapper can prevent
4988 packing so we make the field the type of the inner object unless the
4989 situation forbids it. We may not do that when the field is addressable_p,
4990 typically because in that case this field may later be passed by-ref for
4991 a formal argument expecting the left justification. The condition below
4992 is then matching the addressable_p code for COMPONENT_REF. */
4993 if (! Is_Aliased (gnat_field) && flag_strict_aliasing
4994 && TREE_CODE (gnu_field_type) == RECORD_TYPE
4995 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_field_type))
4996 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
4998 /* If we are packing this record or we have a specified size that's
4999 smaller than that of the field type and the field type is also a record
5000 that's BLKmode and with a small constant size, see if we can get a
5001 better form of the type that allows more packing. If we can, show
5002 a size was specified for it if there wasn't one so we know to
5003 make this a bitfield and avoid making things wider. */
5004 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5005 && TYPE_MODE (gnu_field_type) == BLKmode
5006 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
5007 && compare_tree_int (TYPE_SIZE (gnu_field_type), BIGGEST_ALIGNMENT) <= 0
5009 || (gnu_size != 0 && tree_int_cst_lt (gnu_size,
5010 TYPE_SIZE (gnu_field_type)))))
5012 gnu_field_type = make_packable_type (gnu_field_type);
5014 if (gnu_field_type != gnu_orig_field_type && gnu_size == 0)
5015 gnu_size = rm_size (gnu_field_type);
5018 /* If we are packing the record and the field is BLKmode, round the
5019 size up to a byte boundary. */
5020 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size != 0)
5021 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
5023 if (Present (Component_Clause (gnat_field)))
5025 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
5026 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
5027 gnat_field, FIELD_DECL, 0, 1);
5029 /* Ensure the position does not overlap with the parent subtype,
5031 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
5034 = gnat_to_gnu_type (Parent_Subtype
5035 (Underlying_Type (Scope (gnat_field))));
5037 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
5038 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
5041 ("offset of& must be beyond parent{, minimum allowed is ^}",
5042 First_Bit (Component_Clause (gnat_field)), gnat_field,
5043 TYPE_SIZE_UNIT (gnu_parent));
5047 /* If this field needs strict alignment, ensure the record is
5048 sufficiently aligned and that that position and size are
5049 consistent with the alignment. */
5050 if (needs_strict_alignment)
5052 tree gnu_min_size = round_up (rm_size (gnu_field_type),
5053 TYPE_ALIGN (gnu_field_type));
5055 TYPE_ALIGN (gnu_record_type)
5056 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
5058 /* If Atomic, the size must match exactly and if aliased, the size
5059 must not be less than the rounded size. */
5060 if ((Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
5061 && ! operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
5064 ("atomic field& must be natural size of type{ (^)}",
5065 Last_Bit (Component_Clause (gnat_field)), gnat_field,
5066 TYPE_SIZE (gnu_field_type));
5071 else if (Is_Aliased (gnat_field)
5073 && tree_int_cst_lt (gnu_size, gnu_min_size))
5076 ("size of aliased field& too small{, minimum required is ^}",
5077 Last_Bit (Component_Clause (gnat_field)), gnat_field,
5082 if (! integer_zerop (size_binop
5083 (TRUNC_MOD_EXPR, gnu_pos,
5084 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
5086 if (Is_Aliased (gnat_field))
5088 ("position of aliased field& must be multiple of ^ bits",
5089 First_Bit (Component_Clause (gnat_field)), gnat_field,
5090 TYPE_ALIGN (gnu_field_type));
5092 else if (Treat_As_Volatile (gnat_field))
5094 ("position of volatile field& must be multiple of ^ bits",
5095 First_Bit (Component_Clause (gnat_field)), gnat_field,
5096 TYPE_ALIGN (gnu_field_type));
5098 else if (Strict_Alignment (Etype (gnat_field)))
5100 ("position of & with aliased or tagged components not multiple of ^ bits",
5101 First_Bit (Component_Clause (gnat_field)), gnat_field,
5102 TYPE_ALIGN (gnu_field_type));
5109 /* If an error set the size to zero, show we have no position
5115 if (Is_Atomic (gnat_field))
5116 check_ok_for_atomic (gnu_field_type, gnat_field, 0);
5119 /* If the record has rep clauses and this is the tag field, make a rep
5120 clause for it as well. */
5121 else if (Has_Specified_Layout (Scope (gnat_field))
5122 && Chars (gnat_field) == Name_uTag)
5124 gnu_pos = bitsize_zero_node;
5125 gnu_size = TYPE_SIZE (gnu_field_type);
5128 /* We need to make the size the maximum for the type if it is
5129 self-referential and an unconstrained type. In that case, we can't
5130 pack the field since we can't make a copy to align it. */
5131 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5133 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
5134 && ! Is_Constrained (Underlying_Type (Etype (gnat_field))))
5136 gnu_size = max_size (TYPE_SIZE (gnu_field_type), 1);
5140 /* If no size is specified (or if there was an error), don't specify a
5146 /* Unless this field is aliased, we can remove any left-justified
5147 modular type since it's only needed in the unchecked conversion
5148 case, which doesn't apply here. */
5149 if (! needs_strict_alignment
5150 && TREE_CODE (gnu_field_type) == RECORD_TYPE
5151 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_field_type))
5152 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
5155 = make_type_from_size (gnu_field_type, gnu_size,
5156 Has_Biased_Representation (gnat_field));
5157 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0,
5158 gnat_field, "PAD", 0, definition, 1);
5161 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5162 && TYPE_CONTAINS_TEMPLATE_P (gnu_field_type))
5165 /* Now create the decl for the field. */
5166 set_lineno (gnat_field, 0);
5167 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
5168 packed, gnu_size, gnu_pos,
5169 Is_Aliased (gnat_field));
5171 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
5173 if (Ekind (gnat_field) == E_Discriminant)
5174 DECL_DISCRIMINANT_NUMBER (gnu_field)
5175 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
5180 /* Return 1 if TYPE is a type with variable size, a padding type with a field
5181 of variable size or is a record that has a field such a field. */
5184 is_variable_size (tree type)
5188 /* We need not be concerned about this at all if we don't have
5189 strict alignment. */
5190 if (! STRICT_ALIGNMENT)
5192 else if (! TREE_CONSTANT (TYPE_SIZE (type)))
5194 else if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)
5195 && ! TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
5197 else if (TREE_CODE (type) != RECORD_TYPE
5198 && TREE_CODE (type) != UNION_TYPE
5199 && TREE_CODE (type) != QUAL_UNION_TYPE)
5202 for (field = TYPE_FIELDS (type); field != 0; field = TREE_CHAIN (field))
5203 if (is_variable_size (TREE_TYPE (field)))
5209 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
5210 of GCC trees for fields that are in the record and have already been
5211 processed. When called from gnat_to_gnu_entity during the processing of a
5212 record type definition, the GCC nodes for the discriminants will be on
5213 the chain. The other calls to this function are recursive calls from
5214 itself for the Component_List of a variant and the chain is empty.
5216 PACKED is 1 if this is for a record with "pragma pack" and -1 is this is
5217 for a record type with "pragma component_alignment (storage_unit)".
5219 FINISH_RECORD is nonzero if this call will supply all of the remaining
5220 fields of the record.
5222 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
5223 with a rep clause is to be added. If it is nonzero, that is all that
5224 should be done with such fields.
5226 CANCEL_ALIGNMENT, if nonzero, means the alignment should be zeroed
5227 before laying out the record. This means the alignment only serves
5228 to force fields to be bitfields, but not require the record to be
5229 that aligned. This is used for variants.
5231 ALL_REP, if nonzero, means that a rep clause was found for all the
5232 fields. This simplifies the logic since we know we're not in the mixed
5235 The processing of the component list fills in the chain with all of the
5236 fields of the record and then the record type is finished. */
5239 components_to_record (tree gnu_record_type,
5240 Node_Id component_list,
5241 tree gnu_field_list,
5244 tree *p_gnu_rep_list,
5245 int cancel_alignment,
5248 Node_Id component_decl;
5249 Entity_Id gnat_field;
5250 Node_Id variant_part;
5252 tree gnu_our_rep_list = NULL_TREE;
5253 tree gnu_field, gnu_last;
5254 int layout_with_rep = 0;
5255 int all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type) != 0;
5257 /* For each variable within each component declaration create a GCC field
5258 and add it to the list, skipping any pragmas in the list. */
5260 if (Present (Component_Items (component_list)))
5261 for (component_decl = First_Non_Pragma (Component_Items (component_list));
5262 Present (component_decl);
5263 component_decl = Next_Non_Pragma (component_decl))
5265 gnat_field = Defining_Entity (component_decl);
5267 if (Chars (gnat_field) == Name_uParent)
5268 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
5271 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
5272 packed, definition);
5274 /* If this is the _Tag field, put it before any discriminants,
5275 instead of after them as is the case for all other fields.
5276 Ignore field of void type if only annotating. */
5277 if (Chars (gnat_field) == Name_uTag)
5278 gnu_field_list = chainon (gnu_field_list, gnu_field);
5281 TREE_CHAIN (gnu_field) = gnu_field_list;
5282 gnu_field_list = gnu_field;
5286 save_gnu_tree (gnat_field, gnu_field, 0);
5289 /* At the end of the component list there may be a variant part. */
5290 variant_part = Variant_Part (component_list);
5292 /* If this is an unchecked union, each variant must have exactly one
5293 component, each of which becomes one component of this union. */
5294 if (TREE_CODE (gnu_record_type) == UNION_TYPE && Present (variant_part))
5295 for (variant = First_Non_Pragma (Variants (variant_part));
5297 variant = Next_Non_Pragma (variant))
5300 = First_Non_Pragma (Component_Items (Component_List (variant)));
5301 gnat_field = Defining_Entity (component_decl);
5302 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
5304 TREE_CHAIN (gnu_field) = gnu_field_list;
5305 gnu_field_list = gnu_field;
5306 save_gnu_tree (gnat_field, gnu_field, 0);
5309 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
5310 mutually exclusive and should go in the same memory. To do this we need
5311 to treat each variant as a record whose elements are created from the
5312 component list for the variant. So here we create the records from the
5313 lists for the variants and put them all into the QUAL_UNION_TYPE. */
5314 else if (Present (variant_part))
5316 tree gnu_discriminant = gnat_to_gnu (Name (variant_part));
5318 tree gnu_union_type = make_node (QUAL_UNION_TYPE);
5319 tree gnu_union_field;
5320 tree gnu_variant_list = NULL_TREE;
5321 tree gnu_name = TYPE_NAME (gnu_record_type);
5323 = concat_id_with_name
5324 (get_identifier (Get_Name_String (Chars (Name (variant_part)))),
5327 if (TREE_CODE (gnu_name) == TYPE_DECL)
5328 gnu_name = DECL_NAME (gnu_name);
5330 TYPE_NAME (gnu_union_type)
5331 = concat_id_with_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
5332 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
5334 for (variant = First_Non_Pragma (Variants (variant_part));
5336 variant = Next_Non_Pragma (variant))
5338 tree gnu_variant_type = make_node (RECORD_TYPE);
5339 tree gnu_inner_name;
5342 Get_Variant_Encoding (variant);
5343 gnu_inner_name = get_identifier (Name_Buffer);
5344 TYPE_NAME (gnu_variant_type)
5345 = concat_id_with_name (TYPE_NAME (gnu_union_type),
5346 IDENTIFIER_POINTER (gnu_inner_name));
5348 /* Set the alignment of the inner type in case we need to make
5349 inner objects into bitfields, but then clear it out
5350 so the record actually gets only the alignment required. */
5351 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
5352 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
5354 /* Similarly, if the outer record has a size specified and all fields
5355 have record rep clauses, we can propagate the size into the
5357 if (all_rep_and_size)
5359 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
5360 TYPE_SIZE_UNIT (gnu_variant_type)
5361 = TYPE_SIZE_UNIT (gnu_record_type);
5364 components_to_record (gnu_variant_type, Component_List (variant),
5365 NULL_TREE, packed, definition,
5366 &gnu_our_rep_list, !all_rep_and_size, all_rep);
5368 gnu_qual = choices_to_gnu (gnu_discriminant,
5369 Discrete_Choices (variant));
5371 Set_Present_Expr (variant, annotate_value (gnu_qual));
5372 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
5375 ? TYPE_SIZE (gnu_record_type) : 0),
5377 ? bitsize_zero_node : 0),
5380 DECL_INTERNAL_P (gnu_field) = 1;
5381 DECL_QUALIFIER (gnu_field) = gnu_qual;
5382 TREE_CHAIN (gnu_field) = gnu_variant_list;
5383 gnu_variant_list = gnu_field;
5386 /* We use to delete the empty variants from the end. However,
5387 we no longer do that because we need them to generate complete
5388 debugging information for the variant record. Otherwise,
5389 the union type definition will be missing the fields associated
5390 to these empty variants. */
5392 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
5393 if (gnu_variant_list != 0)
5395 if (all_rep_and_size)
5397 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
5398 TYPE_SIZE_UNIT (gnu_union_type)
5399 = TYPE_SIZE_UNIT (gnu_record_type);
5402 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
5403 all_rep_and_size, 0);
5406 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
5408 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
5409 all_rep ? bitsize_zero_node : 0, 0);
5411 DECL_INTERNAL_P (gnu_union_field) = 1;
5412 TREE_CHAIN (gnu_union_field) = gnu_field_list;
5413 gnu_field_list = gnu_union_field;
5417 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
5418 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
5419 in a separate pass since we want to handle the discriminants but can't
5420 play with them until we've used them in debugging data above.
5422 ??? Note: if we then reorder them, debugging information will be wrong,
5423 but there's nothing that can be done about this at the moment. */
5425 for (gnu_field = gnu_field_list, gnu_last = 0; gnu_field; )
5427 if (DECL_FIELD_OFFSET (gnu_field) != 0)
5429 tree gnu_next = TREE_CHAIN (gnu_field);
5432 gnu_field_list = gnu_next;
5434 TREE_CHAIN (gnu_last) = gnu_next;
5436 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
5437 gnu_our_rep_list = gnu_field;
5438 gnu_field = gnu_next;
5442 gnu_last = gnu_field;
5443 gnu_field = TREE_CHAIN (gnu_field);
5447 /* If we have any items in our rep'ed field list, it is not the case that all
5448 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
5449 set it and ignore the items. Otherwise, sort the fields by bit position
5450 and put them into their own record if we have any fields without
5452 if (gnu_our_rep_list != 0 && p_gnu_rep_list != 0 && ! all_rep)
5453 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
5454 else if (gnu_our_rep_list != 0)
5457 = gnu_field_list == 0 ? gnu_record_type : make_node (RECORD_TYPE);
5458 int len = list_length (gnu_our_rep_list);
5459 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
5462 /* Set DECL_SECTION_NAME to increasing integers so we have a
5464 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
5465 gnu_field = TREE_CHAIN (gnu_field), i++)
5467 gnu_arr[i] = gnu_field;
5468 DECL_SECTION_NAME (gnu_field) = size_int (i);
5471 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
5473 /* Put the fields in the list in order of increasing position, which
5474 means we start from the end. */
5475 gnu_our_rep_list = NULL_TREE;
5476 for (i = len - 1; i >= 0; i--)
5478 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
5479 gnu_our_rep_list = gnu_arr[i];
5480 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
5481 DECL_SECTION_NAME (gnu_arr[i]) = 0;
5484 if (gnu_field_list != 0)
5486 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, 0);
5487 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
5488 gnu_record_type, 0, 0, 0, 1);
5489 DECL_INTERNAL_P (gnu_field) = 1;
5490 gnu_field_list = chainon (gnu_field_list, gnu_field);
5494 layout_with_rep = 1;
5495 gnu_field_list = nreverse (gnu_our_rep_list);
5499 if (cancel_alignment)
5500 TYPE_ALIGN (gnu_record_type) = 0;
5502 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
5503 layout_with_rep, 0);
5506 /* Called via qsort from the above. Returns -1, 1, depending on the
5507 bit positions and ordinals of the two fields. */
5510 compare_field_bitpos (const PTR rt1, const PTR rt2)
5512 tree *t1 = (tree *) rt1;
5513 tree *t2 = (tree *) rt2;
5515 if (tree_int_cst_equal (bit_position (*t1), bit_position (*t2)))
5517 (tree_int_cst_lt (DECL_SECTION_NAME (*t1), DECL_SECTION_NAME (*t2))
5519 else if (tree_int_cst_lt (bit_position (*t1), bit_position (*t2)))
5525 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
5526 placed into an Esize, Component_Bit_Offset, or Component_Size value
5527 in the GNAT tree. */
5530 annotate_value (tree gnu_size)
5532 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
5534 Node_Ref_Or_Val ops[3], ret;
5538 /* If back annotation is suppressed by the front end, return No_Uint */
5539 if (!Back_Annotate_Rep_Info)
5542 /* See if we've already saved the value for this node. */
5543 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (gnu_size)))
5544 && TREE_COMPLEXITY (gnu_size) != 0)
5545 return (Node_Ref_Or_Val) TREE_COMPLEXITY (gnu_size);
5547 /* If we do not return inside this switch, TCODE will be set to the
5548 code to use for a Create_Node operand and LEN (set above) will be
5549 the number of recursive calls for us to make. */
5551 switch (TREE_CODE (gnu_size))
5554 if (TREE_OVERFLOW (gnu_size))
5557 /* This may have come from a conversion from some smaller type,
5558 so ensure this is in bitsizetype. */
5559 gnu_size = convert (bitsizetype, gnu_size);
5561 /* For negative values, use NEGATE_EXPR of the supplied value. */
5562 if (tree_int_cst_sgn (gnu_size) < 0)
5564 /* The rediculous code below is to handle the case of the largest
5565 negative integer. */
5566 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
5570 if (TREE_CONSTANT_OVERFLOW (negative_size))
5573 = size_binop (MINUS_EXPR, bitsize_zero_node,
5574 size_binop (PLUS_EXPR, gnu_size,
5579 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
5581 temp = build (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
5583 return annotate_value (temp);
5586 if (! host_integerp (gnu_size, 1))
5589 size = tree_low_cst (gnu_size, 1);
5591 /* This peculiar test is to make sure that the size fits in an int
5592 on machines where HOST_WIDE_INT is not "int". */
5593 if (tree_low_cst (gnu_size, 1) == size)
5594 return UI_From_Int (size);
5599 /* The only case we handle here is a simple discriminant reference. */
5600 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
5601 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
5602 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)) != 0)
5603 return Create_Node (Discrim_Val,
5604 annotate_value (DECL_DISCRIMINANT_NUMBER
5605 (TREE_OPERAND (gnu_size, 1))),
5610 case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
5611 return annotate_value (TREE_OPERAND (gnu_size, 0));
5613 /* Now just list the operations we handle. */
5614 case COND_EXPR: tcode = Cond_Expr; break;
5615 case PLUS_EXPR: tcode = Plus_Expr; break;
5616 case MINUS_EXPR: tcode = Minus_Expr; break;
5617 case MULT_EXPR: tcode = Mult_Expr; break;
5618 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
5619 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
5620 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
5621 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
5622 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
5623 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
5624 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
5625 case NEGATE_EXPR: tcode = Negate_Expr; break;
5626 case MIN_EXPR: tcode = Min_Expr; break;
5627 case MAX_EXPR: tcode = Max_Expr; break;
5628 case ABS_EXPR: tcode = Abs_Expr; break;
5629 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
5630 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
5631 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
5632 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
5633 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
5634 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
5635 case LT_EXPR: tcode = Lt_Expr; break;
5636 case LE_EXPR: tcode = Le_Expr; break;
5637 case GT_EXPR: tcode = Gt_Expr; break;
5638 case GE_EXPR: tcode = Ge_Expr; break;
5639 case EQ_EXPR: tcode = Eq_Expr; break;
5640 case NE_EXPR: tcode = Ne_Expr; break;
5646 /* Now get each of the operands that's relevant for this code. If any
5647 cannot be expressed as a repinfo node, say we can't. */
5648 for (i = 0; i < 3; i++)
5651 for (i = 0; i < len; i++)
5653 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
5654 if (ops[i] == No_Uint)
5658 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
5659 TREE_COMPLEXITY (gnu_size) = ret;
5663 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
5664 GCC type, set Component_Bit_Offset and Esize to the position and size
5668 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
5672 Entity_Id gnat_field;
5674 /* We operate by first making a list of all field and their positions
5675 (we can get the sizes easily at any time) by a recursive call
5676 and then update all the sizes into the tree. */
5677 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
5678 size_zero_node, bitsize_zero_node,
5681 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
5682 gnat_field = Next_Entity (gnat_field))
5683 if ((Ekind (gnat_field) == E_Component
5684 || (Ekind (gnat_field) == E_Discriminant
5685 && ! Is_Unchecked_Union (Scope (gnat_field)))))
5687 tree parent_offset = bitsize_zero_node;
5690 = purpose_member (gnat_to_gnu_entity (gnat_field, NULL_TREE, 0),
5695 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
5697 /* In this mode the tag and parent components have not been
5698 generated, so we add the appropriate offset to each
5699 component. For a component appearing in the current
5700 extension, the offset is the size of the parent. */
5701 if (Is_Derived_Type (gnat_entity)
5702 && Original_Record_Component (gnat_field) == gnat_field)
5704 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
5707 parent_offset = bitsize_int (POINTER_SIZE);
5710 Set_Component_Bit_Offset
5713 (size_binop (PLUS_EXPR,
5714 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
5715 TREE_VALUE (TREE_VALUE
5716 (TREE_VALUE (gnu_entry)))),
5719 Set_Esize (gnat_field,
5720 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
5722 else if (type_annotate_only
5723 && Is_Tagged_Type (gnat_entity)
5724 && Is_Derived_Type (gnat_entity))
5726 /* If there is no gnu_entry, this is an inherited component whose
5727 position is the same as in the parent type. */
5728 Set_Component_Bit_Offset
5730 Component_Bit_Offset (Original_Record_Component (gnat_field)));
5731 Set_Esize (gnat_field,
5732 Esize (Original_Record_Component (gnat_field)));
5737 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
5738 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
5739 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
5740 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
5741 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
5742 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
5746 compute_field_positions (tree gnu_type,
5750 unsigned int offset_align)
5753 tree gnu_result = gnu_list;
5755 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
5756 gnu_field = TREE_CHAIN (gnu_field))
5758 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
5759 DECL_FIELD_BIT_OFFSET (gnu_field));
5760 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
5761 DECL_FIELD_OFFSET (gnu_field));
5762 unsigned int our_offset_align
5763 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
5766 = tree_cons (gnu_field,
5767 tree_cons (gnu_our_offset,
5768 tree_cons (size_int (our_offset_align),
5769 gnu_our_bitpos, NULL_TREE),
5773 if (DECL_INTERNAL_P (gnu_field))
5775 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
5776 gnu_our_offset, gnu_our_bitpos,
5783 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
5784 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
5785 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
5786 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
5787 for the size of a field. COMPONENT_P is true if we are being called
5788 to process the Component_Size of GNAT_OBJECT. This is used for error
5789 message handling and to indicate to use the object size of GNU_TYPE.
5790 ZERO_OK is nonzero if a size of zero is permitted; if ZERO_OK is zero,
5791 it means that a size of zero should be treated as an unspecified size. */
5794 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
5795 enum tree_code kind, int component_p, int zero_ok)
5797 Node_Id gnat_error_node;
5799 = kind == VAR_DECL ? TYPE_SIZE (gnu_type) : rm_size (gnu_type);
5802 /* Find the node to use for errors. */
5803 if ((Ekind (gnat_object) == E_Component
5804 || Ekind (gnat_object) == E_Discriminant)
5805 && Present (Component_Clause (gnat_object)))
5806 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
5807 else if (Present (Size_Clause (gnat_object)))
5808 gnat_error_node = Expression (Size_Clause (gnat_object));
5810 gnat_error_node = gnat_object;
5812 /* Return 0 if no size was specified, either because Esize was not Present or
5813 the specified size was zero. */
5814 if (No (uint_size) || uint_size == No_Uint)
5817 /* Get the size as a tree. Give an error if a size was specified, but cannot
5818 be represented as in sizetype. */
5819 size = UI_To_gnu (uint_size, bitsizetype);
5820 if (TREE_OVERFLOW (size))
5822 post_error_ne (component_p ? "component size of & is too large"
5823 : "size of & is too large",
5824 gnat_error_node, gnat_object);
5827 /* Ignore a negative size since that corresponds to our back-annotation.
5828 Also ignore a zero size unless a size clause exists. */
5829 else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && ! zero_ok))
5832 /* The size of objects is always a multiple of a byte. */
5833 if (kind == VAR_DECL
5834 && ! integer_zerop (size_binop (TRUNC_MOD_EXPR, size,
5835 bitsize_unit_node)))
5838 post_error_ne ("component size for& is not a multiple of Storage_Unit",
5839 gnat_error_node, gnat_object);
5841 post_error_ne ("size for& is not a multiple of Storage_Unit",
5842 gnat_error_node, gnat_object);
5846 /* If this is an integral type or a packed array type, the front-end has
5847 verified the size, so we need not do it here (which would entail
5848 checking against the bounds). However, if this is an aliased object, it
5849 may not be smaller than the type of the object. */
5850 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
5851 && ! (kind == VAR_DECL && Is_Aliased (gnat_object)))
5854 /* If the object is a record that contains a template, add the size of
5855 the template to the specified size. */
5856 if (TREE_CODE (gnu_type) == RECORD_TYPE
5857 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
5858 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
5860 /* Modify the size of the type to be that of the maximum size if it has a
5861 discriminant or the size of a thin pointer if this is a fat pointer. */
5862 if (type_size != 0 && CONTAINS_PLACEHOLDER_P (type_size))
5863 type_size = max_size (type_size, 1);
5864 else if (TYPE_FAT_POINTER_P (gnu_type))
5865 type_size = bitsize_int (POINTER_SIZE);
5867 /* If this is an access type, the minimum size is that given by the smallest
5868 integral mode that's valid for pointers. */
5869 if (TREE_CODE (gnu_type) == POINTER_TYPE)
5871 enum machine_mode p_mode;
5873 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
5874 !targetm.valid_pointer_mode (p_mode);
5875 p_mode = GET_MODE_WIDER_MODE (p_mode))
5878 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
5881 /* If the size of the object is a constant, the new size must not be
5883 if (TREE_CODE (type_size) != INTEGER_CST
5884 || TREE_OVERFLOW (type_size)
5885 || tree_int_cst_lt (size, type_size))
5889 ("component size for& too small{, minimum allowed is ^}",
5890 gnat_error_node, gnat_object, type_size);
5892 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
5893 gnat_error_node, gnat_object, type_size);
5895 if (kind == VAR_DECL && ! component_p
5896 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
5897 && ! tree_int_cst_lt (size, rm_size (gnu_type)))
5898 post_error_ne_tree_2
5899 ("\\size of ^ is not a multiple of alignment (^ bits)",
5900 gnat_error_node, gnat_object, rm_size (gnu_type),
5901 TYPE_ALIGN (gnu_type));
5903 else if (INTEGRAL_TYPE_P (gnu_type))
5904 post_error_ne ("\\size would be legal if & were not aliased!",
5905 gnat_error_node, gnat_object);
5913 /* Similarly, but both validate and process a value of RM_Size. This
5914 routine is only called for types. */
5917 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
5919 /* Only give an error if a Value_Size clause was explicitly given.
5920 Otherwise, we'd be duplicating an error on the Size clause. */
5921 Node_Id gnat_attr_node
5922 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
5923 tree old_size = rm_size (gnu_type);
5926 /* Get the size as a tree. Do nothing if none was specified, either
5927 because RM_Size was not Present or if the specified size was zero.
5928 Give an error if a size was specified, but cannot be represented as
5930 if (No (uint_size) || uint_size == No_Uint)
5933 size = UI_To_gnu (uint_size, bitsizetype);
5934 if (TREE_OVERFLOW (size))
5936 if (Present (gnat_attr_node))
5937 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
5943 /* Ignore a negative size since that corresponds to our back-annotation.
5944 Also ignore a zero size unless a size clause exists, a Value_Size
5945 clause exists, or this is an integer type, in which case the
5946 front end will have always set it. */
5947 else if (tree_int_cst_sgn (size) < 0
5948 || (integer_zerop (size) && No (gnat_attr_node)
5949 && ! Has_Size_Clause (gnat_entity)
5950 && ! Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
5953 /* If the old size is self-referential, get the maximum size. */
5954 if (CONTAINS_PLACEHOLDER_P (old_size))
5955 old_size = max_size (old_size, 1);
5957 /* If the size of the object is a constant, the new size must not be
5958 smaller (the front end checks this for scalar types). */
5959 if (TREE_CODE (old_size) != INTEGER_CST
5960 || TREE_OVERFLOW (old_size)
5961 || (AGGREGATE_TYPE_P (gnu_type)
5962 && tree_int_cst_lt (size, old_size)))
5964 if (Present (gnat_attr_node))
5966 ("Value_Size for& too small{, minimum allowed is ^}",
5967 gnat_attr_node, gnat_entity, old_size);
5972 /* Otherwise, set the RM_Size. */
5973 if (TREE_CODE (gnu_type) == INTEGER_TYPE
5974 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
5975 TYPE_RM_SIZE_INT (gnu_type) = size;
5976 else if (TREE_CODE (gnu_type) == ENUMERAL_TYPE)
5977 SET_TYPE_RM_SIZE_ENUM (gnu_type, size);
5978 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
5979 || TREE_CODE (gnu_type) == UNION_TYPE
5980 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
5981 && ! TYPE_IS_FAT_POINTER_P (gnu_type))
5982 SET_TYPE_ADA_SIZE (gnu_type, size);
5985 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
5986 If TYPE is the best type, return it. Otherwise, make a new type. We
5987 only support new integral and pointer types. BIASED_P is nonzero if
5988 we are making a biased type. */
5991 make_type_from_size (tree type, tree size_tree, int biased_p)
5994 unsigned HOST_WIDE_INT size;
5996 /* If size indicates an error, just return TYPE to avoid propagating the
5997 error. Likewise if it's too large to represent. */
5998 if (size_tree == 0 || ! host_integerp (size_tree, 1))
6001 size = tree_low_cst (size_tree, 1);
6002 switch (TREE_CODE (type))
6006 /* Only do something if the type is not already the proper size and is
6007 not a packed array type. */
6008 if (TYPE_PACKED_ARRAY_TYPE_P (type)
6009 || (TYPE_PRECISION (type) == size
6010 && biased_p == (TREE_CODE (type) == INTEGER_CST
6011 && TYPE_BIASED_REPRESENTATION_P (type))))
6014 size = MIN (size, LONG_LONG_TYPE_SIZE);
6015 new_type = make_signed_type (size);
6016 TREE_TYPE (new_type)
6017 = TREE_TYPE (type) != 0 ? TREE_TYPE (type) : type;
6018 TYPE_MIN_VALUE (new_type)
6019 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
6020 TYPE_MAX_VALUE (new_type)
6021 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
6022 TYPE_BIASED_REPRESENTATION_P (new_type)
6023 = ((TREE_CODE (type) == INTEGER_TYPE
6024 && TYPE_BIASED_REPRESENTATION_P (type))
6026 TREE_UNSIGNED (new_type)
6027 = TREE_UNSIGNED (type) | TYPE_BIASED_REPRESENTATION_P (new_type);
6028 TYPE_RM_SIZE_INT (new_type) = bitsize_int (size);
6032 /* Do something if this is a fat pointer, in which case we
6033 may need to return the thin pointer. */
6034 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
6037 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)));
6041 /* Only do something if this is a thin pointer, in which case we
6042 may need to return the fat pointer. */
6043 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
6045 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
6056 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
6057 a type or object whose present alignment is ALIGN. If this alignment is
6058 valid, return it. Otherwise, give an error and return ALIGN. */
6061 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
6063 Node_Id gnat_error_node = gnat_entity;
6064 unsigned int new_align;
6066 #ifndef MAX_OFILE_ALIGNMENT
6067 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
6070 if (Present (Alignment_Clause (gnat_entity)))
6071 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
6073 /* Don't worry about checking alignment if alignment was not specified
6074 by the source program and we already posted an error for this entity. */
6076 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
6079 /* Within GCC, an alignment is an integer, so we must make sure a
6080 value is specified that fits in that range. Also, alignments of
6081 more than MAX_OFILE_ALIGNMENT can't be supported. */
6083 if (! UI_Is_In_Int_Range (alignment)
6084 || ((new_align = UI_To_Int (alignment))
6085 > MAX_OFILE_ALIGNMENT / BITS_PER_UNIT))
6086 post_error_ne_num ("largest supported alignment for& is ^",
6087 gnat_error_node, gnat_entity,
6088 MAX_OFILE_ALIGNMENT / BITS_PER_UNIT);
6089 else if (! (Present (Alignment_Clause (gnat_entity))
6090 && From_At_Mod (Alignment_Clause (gnat_entity)))
6091 && new_align * BITS_PER_UNIT < align)
6092 post_error_ne_num ("alignment for& must be at least ^",
6093 gnat_error_node, gnat_entity,
6094 align / BITS_PER_UNIT);
6096 align = MAX (align, new_align == 0 ? 1 : new_align * BITS_PER_UNIT);
6101 /* Verify that OBJECT, a type or decl, is something we can implement
6102 atomically. If not, give an error for GNAT_ENTITY. COMP_P is nonzero
6103 if we require atomic components. */
6106 check_ok_for_atomic (tree object, Entity_Id gnat_entity, int comp_p)
6108 Node_Id gnat_error_point = gnat_entity;
6110 enum machine_mode mode;
6114 /* There are three case of what OBJECT can be. It can be a type, in which
6115 case we take the size, alignment and mode from the type. It can be a
6116 declaration that was indirect, in which case the relevant values are
6117 that of the type being pointed to, or it can be a normal declaration,
6118 in which case the values are of the decl. The code below assumes that
6119 OBJECT is either a type or a decl. */
6120 if (TYPE_P (object))
6122 mode = TYPE_MODE (object);
6123 align = TYPE_ALIGN (object);
6124 size = TYPE_SIZE (object);
6126 else if (DECL_BY_REF_P (object))
6128 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
6129 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
6130 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
6134 mode = DECL_MODE (object);
6135 align = DECL_ALIGN (object);
6136 size = DECL_SIZE (object);
6139 /* Consider all floating-point types atomic and any types that that are
6140 represented by integers no wider than a machine word. */
6141 if (GET_MODE_CLASS (mode) == MODE_FLOAT
6142 || ((GET_MODE_CLASS (mode) == MODE_INT
6143 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
6144 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
6147 /* For the moment, also allow anything that has an alignment equal
6148 to its size and which is smaller than a word. */
6149 if (size != 0 && TREE_CODE (size) == INTEGER_CST
6150 && compare_tree_int (size, align) == 0
6151 && align <= BITS_PER_WORD)
6154 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
6155 gnat_node = Next_Rep_Item (gnat_node))
6157 if (! comp_p && Nkind (gnat_node) == N_Pragma
6158 && Get_Pragma_Id (Chars (gnat_node)) == Pragma_Atomic)
6159 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
6160 else if (comp_p && Nkind (gnat_node) == N_Pragma
6161 && (Get_Pragma_Id (Chars (gnat_node))
6162 == Pragma_Atomic_Components))
6163 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
6167 post_error_ne ("atomic access to component of & cannot be guaranteed",
6168 gnat_error_point, gnat_entity);
6170 post_error_ne ("atomic access to & cannot be guaranteed",
6171 gnat_error_point, gnat_entity);
6174 /* Given a type T, a FIELD_DECL F, and a replacement value R,
6175 return a new type with all size expressions that contain F
6176 updated by replacing F with R. This is identical to GCC's
6177 substitute_in_type except that it knows about TYPE_INDEX_TYPE.
6178 If F is NULL_TREE, always make a new RECORD_TYPE, even if nothing has
6182 gnat_substitute_in_type (tree t, tree f, tree r)
6187 switch (TREE_CODE (t))
6193 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
6194 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
6196 tree low = substitute_in_expr (TYPE_MIN_VALUE (t), f, r);
6197 tree high = substitute_in_expr (TYPE_MAX_VALUE (t), f, r);
6199 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
6202 new = build_range_type (TREE_TYPE (t), low, high);
6203 if (TYPE_INDEX_TYPE (t))
6204 SET_TYPE_INDEX_TYPE (new,
6205 gnat_substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
6212 if ((TYPE_MIN_VALUE (t) != 0
6213 && CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t)))
6214 || (TYPE_MAX_VALUE (t) != 0
6215 && CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t))))
6217 tree low = 0, high = 0;
6219 if (TYPE_MIN_VALUE (t))
6220 low = substitute_in_expr (TYPE_MIN_VALUE (t), f, r);
6221 if (TYPE_MAX_VALUE (t))
6222 high = substitute_in_expr (TYPE_MAX_VALUE (t), f, r);
6224 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
6228 TYPE_MIN_VALUE (t) = low;
6229 TYPE_MAX_VALUE (t) = high;
6234 tem = gnat_substitute_in_type (TREE_TYPE (t), f, r);
6235 if (tem == TREE_TYPE (t))
6238 return build_complex_type (tem);
6246 /* Don't know how to do these yet. */
6251 tree component = gnat_substitute_in_type (TREE_TYPE (t), f, r);
6252 tree domain = gnat_substitute_in_type (TYPE_DOMAIN (t), f, r);
6254 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
6257 new = build_array_type (component, domain);
6258 TYPE_SIZE (new) = 0;
6259 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
6260 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
6262 TYPE_ALIGN (new) = TYPE_ALIGN (t);
6268 case QUAL_UNION_TYPE:
6272 = (f == NULL_TREE && ! TREE_CONSTANT (TYPE_SIZE (t)));
6273 int field_has_rep = 0;
6274 tree last_field = 0;
6276 tree new = copy_type (t);
6278 /* Start out with no fields, make new fields, and chain them
6279 in. If we haven't actually changed the type of any field,
6280 discard everything we've done and return the old type. */
6282 TYPE_FIELDS (new) = 0;
6283 TYPE_SIZE (new) = 0;
6285 for (field = TYPE_FIELDS (t); field;
6286 field = TREE_CHAIN (field))
6288 tree new_field = copy_node (field);
6290 TREE_TYPE (new_field)
6291 = gnat_substitute_in_type (TREE_TYPE (new_field), f, r);
6293 if (DECL_HAS_REP_P (field) && ! DECL_INTERNAL_P (field))
6295 else if (TREE_TYPE (new_field) != TREE_TYPE (field))
6298 /* If this is an internal field and the type of this field is
6299 a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If
6300 the type just has one element, treat that as the field.
6301 But don't do this if we are processing a QUAL_UNION_TYPE. */
6302 if (TREE_CODE (t) != QUAL_UNION_TYPE
6303 && DECL_INTERNAL_P (new_field)
6304 && (TREE_CODE (TREE_TYPE (new_field)) == UNION_TYPE
6305 || TREE_CODE (TREE_TYPE (new_field)) == RECORD_TYPE))
6307 if (TYPE_FIELDS (TREE_TYPE (new_field)) == 0)
6310 if (TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field))) == 0)
6313 = copy_node (TYPE_FIELDS (TREE_TYPE (new_field)));
6315 /* Make sure omitting the union doesn't change
6317 DECL_ALIGN (next_new_field) = DECL_ALIGN (new_field);
6318 new_field = next_new_field;
6322 DECL_CONTEXT (new_field) = new;
6323 SET_DECL_ORIGINAL_FIELD (new_field,
6324 (DECL_ORIGINAL_FIELD (field) != 0
6325 ? DECL_ORIGINAL_FIELD (field) : field));
6327 /* If the size of the old field was set at a constant,
6328 propagate the size in case the type's size was variable.
6329 (This occurs in the case of a variant or discriminated
6330 record with a default size used as a field of another
6332 DECL_SIZE (new_field)
6333 = TREE_CODE (DECL_SIZE (field)) == INTEGER_CST
6334 ? DECL_SIZE (field) : 0;
6335 DECL_SIZE_UNIT (new_field)
6336 = TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST
6337 ? DECL_SIZE_UNIT (field) : 0;
6339 if (TREE_CODE (t) == QUAL_UNION_TYPE)
6341 tree new_q = substitute_in_expr (DECL_QUALIFIER (field), f, r);
6343 if (new_q != DECL_QUALIFIER (new_field))
6346 /* Do the substitution inside the qualifier and if we find
6347 that this field will not be present, omit it. */
6348 DECL_QUALIFIER (new_field) = new_q;
6350 if (integer_zerop (DECL_QUALIFIER (new_field)))
6354 if (last_field == 0)
6355 TYPE_FIELDS (new) = new_field;
6357 TREE_CHAIN (last_field) = new_field;
6359 last_field = new_field;
6361 /* If this is a qualified type and this field will always be
6362 present, we are done. */
6363 if (TREE_CODE (t) == QUAL_UNION_TYPE
6364 && integer_onep (DECL_QUALIFIER (new_field)))
6368 /* If this used to be a qualified union type, but we now know what
6369 field will be present, make this a normal union. */
6370 if (changed_field && TREE_CODE (new) == QUAL_UNION_TYPE
6371 && (TYPE_FIELDS (new) == 0
6372 || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new)))))
6373 TREE_SET_CODE (new, UNION_TYPE);
6374 else if (! changed_field)
6382 /* If the size was originally a constant use it. */
6383 if (TYPE_SIZE (t) != 0 && TREE_CODE (TYPE_SIZE (t)) == INTEGER_CST
6384 && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST)
6386 TYPE_SIZE (new) = TYPE_SIZE (t);
6387 TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t);
6388 SET_TYPE_ADA_SIZE (new, TYPE_ADA_SIZE (t));
6399 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
6400 needed to represent the object. */
6403 rm_size (tree gnu_type)
6405 /* For integer types, this is the precision. For record types, we store
6406 the size explicitly. For other types, this is just the size. */
6408 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type) != 0)
6409 return TYPE_RM_SIZE (gnu_type);
6410 else if (TREE_CODE (gnu_type) == RECORD_TYPE
6411 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
6412 /* Return the rm_size of the actual data plus the size of the template. */
6414 size_binop (PLUS_EXPR,
6415 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
6416 DECL_SIZE (TYPE_FIELDS (gnu_type)));
6417 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
6418 || TREE_CODE (gnu_type) == UNION_TYPE
6419 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
6420 && ! TYPE_IS_FAT_POINTER_P (gnu_type)
6421 && TYPE_ADA_SIZE (gnu_type) != 0)
6422 return TYPE_ADA_SIZE (gnu_type);
6424 return TYPE_SIZE (gnu_type);
6427 /* Return an identifier representing the external name to be used for
6428 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
6429 and the specified suffix. */
6432 create_concat_name (Entity_Id gnat_entity, const char *suffix)
6434 const char *str = (suffix == 0 ? "" : suffix);
6435 String_Template temp = {1, strlen (str)};
6436 Fat_Pointer fp = {str, &temp};
6438 Get_External_Name_With_Suffix (gnat_entity, fp);
6441 /* A variable using the Stdcall convention (meaning we are running
6442 on a Windows box) live in a DLL. Here we adjust its name to use
6443 the jump-table, the _imp__NAME contains the address for the NAME
6447 Entity_Kind kind = Ekind (gnat_entity);
6448 const char *prefix = "_imp__";
6449 int plen = strlen (prefix);
6451 if ((kind == E_Variable || kind == E_Constant)
6452 && Convention (gnat_entity) == Convention_Stdcall)
6455 for (k = 0; k <= Name_Len; k++)
6456 Name_Buffer [Name_Len - k + plen] = Name_Buffer [Name_Len - k];
6457 strncpy (Name_Buffer, prefix, plen);
6462 return get_identifier (Name_Buffer);
6465 /* Return the name to be used for GNAT_ENTITY. If a type, create a
6466 fully-qualified name, possibly with type information encoding.
6467 Otherwise, return the name. */
6470 get_entity_name (Entity_Id gnat_entity)
6472 Get_Encoded_Name (gnat_entity);
6473 return get_identifier (Name_Buffer);
6476 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
6477 string, return a new IDENTIFIER_NODE that is the concatenation of
6478 the name in GNU_ID and SUFFIX. */
6481 concat_id_with_name (tree gnu_id, const char *suffix)
6483 int len = IDENTIFIER_LENGTH (gnu_id);
6485 strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id),
6486 IDENTIFIER_LENGTH (gnu_id));
6487 strncpy (Name_Buffer + len, "___", 3);
6489 strcpy (Name_Buffer + len, suffix);
6490 return get_identifier (Name_Buffer);
6493 #include "gt-ada-decl.h"