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);
105 static void annotate_decl_with_node (tree, Node_Id);
107 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
108 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
109 refer to an Ada type. */
112 gnat_to_gnu_type (Entity_Id gnat_entity)
116 /* The back end never attempts to annotate generic types */
117 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
118 return void_type_node;
120 /* Convert the ada entity type into a GCC TYPE_DECL node. */
121 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
122 if (TREE_CODE (gnu_decl) != TYPE_DECL)
125 return TREE_TYPE (gnu_decl);
128 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
129 entity, this routine returns the equivalent GCC tree for that entity
130 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
133 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
134 initial value (in GCC tree form). This is optional for variables.
135 For renamed entities, GNU_EXPR gives the object being renamed.
137 DEFINITION is nonzero if this call is intended for a definition. This is
138 used for separate compilation where it necessary to know whether an
139 external declaration or a definition should be created if the GCC equivalent
140 was not created previously. The value of 1 is normally used for a non-zero
141 DEFINITION, but a value of 2 is used in special circumstances, defined in
145 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
149 /* Contains the gnu XXXX_DECL tree node which is equivalent to the input
150 GNAT tree. This node will be associated with the GNAT node by calling
151 the save_gnu_tree routine at the end of the `switch' statement. */
153 /* Nonzero if we have already saved gnu_decl as a gnat association. */
155 /* Nonzero if we incremented defer_incomplete_level. */
156 int this_deferred = 0;
157 /* Nonzero if we incremented force_global. */
159 /* Nonzero if we should check to see if elaborated during processing. */
160 int maybe_present = 0;
161 /* Nonzero if we made GNU_DECL and its type here. */
162 int this_made_decl = 0;
163 struct attrib *attr_list = 0;
164 int debug_info_p = (Needs_Debug_Info (gnat_entity)
165 || debug_info_level == DINFO_LEVEL_VERBOSE);
166 Entity_Kind kind = Ekind (gnat_entity);
169 = ((Known_Esize (gnat_entity)
170 && UI_Is_In_Int_Range (Esize (gnat_entity)))
171 ? MIN (UI_To_Int (Esize (gnat_entity)),
172 IN (kind, Float_Kind)
173 ? fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE)
174 : IN (kind, Access_Kind) ? POINTER_SIZE * 2
175 : LONG_LONG_TYPE_SIZE)
176 : LONG_LONG_TYPE_SIZE);
179 = ((Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity)))
180 || From_With_Type (gnat_entity));
181 unsigned int align = 0;
183 /* Since a use of an Itype is a definition, process it as such if it
184 is not in a with'ed unit. */
186 if (! definition && Is_Itype (gnat_entity)
187 && ! present_gnu_tree (gnat_entity)
188 && In_Extended_Main_Code_Unit (gnat_entity))
190 /* Ensure that we are in a subprogram mentioned in the Scope
191 chain of this entity, our current scope is global,
192 or that we encountered a task or entry (where we can't currently
193 accurately check scoping). */
194 if (current_function_decl == 0
195 || DECL_ELABORATION_PROC_P (current_function_decl))
197 process_type (gnat_entity);
198 return get_gnu_tree (gnat_entity);
201 for (gnat_temp = Scope (gnat_entity);
202 Present (gnat_temp); gnat_temp = Scope (gnat_temp))
204 if (Is_Type (gnat_temp))
205 gnat_temp = Underlying_Type (gnat_temp);
207 if (Ekind (gnat_temp) == E_Subprogram_Body)
209 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
211 if (IN (Ekind (gnat_temp), Subprogram_Kind)
212 && Present (Protected_Body_Subprogram (gnat_temp)))
213 gnat_temp = Protected_Body_Subprogram (gnat_temp);
215 if (Ekind (gnat_temp) == E_Entry
216 || Ekind (gnat_temp) == E_Entry_Family
217 || Ekind (gnat_temp) == E_Task_Type
218 || (IN (Ekind (gnat_temp), Subprogram_Kind)
219 && present_gnu_tree (gnat_temp)
220 && (current_function_decl
221 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
223 process_type (gnat_entity);
224 return get_gnu_tree (gnat_entity);
228 /* gigi abort 122 means that the entity "gnat_entity" has an incorrect
229 scope, i.e. that its scope does not correspond to the subprogram
230 in which it is declared */
234 /* If this is entity 0, something went badly wrong. */
235 if (gnat_entity == 0)
238 /* If we've already processed this entity, return what we got last time.
239 If we are defining the node, we should not have already processed it.
240 In that case, we will abort below when we try to save a new GCC tree for
241 this object. We also need to handle the case of getting a dummy type
242 when a Full_View exists. */
244 if (present_gnu_tree (gnat_entity)
246 || (Is_Type (gnat_entity) && imported_p)))
248 gnu_decl = get_gnu_tree (gnat_entity);
250 if (TREE_CODE (gnu_decl) == TYPE_DECL
251 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
252 && IN (kind, Incomplete_Or_Private_Kind)
253 && Present (Full_View (gnat_entity)))
255 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
258 save_gnu_tree (gnat_entity, NULL_TREE, 0);
259 save_gnu_tree (gnat_entity, gnu_decl, 0);
265 /* If this is a numeric or enumeral type, or an access type, a nonzero
266 Esize must be specified unless it was specified by the programmer. */
267 if ((IN (kind, Numeric_Kind) || IN (kind, Enumeration_Kind)
268 || (IN (kind, Access_Kind)
269 && kind != E_Access_Protected_Subprogram_Type
270 && kind != E_Access_Subtype))
271 && Unknown_Esize (gnat_entity)
272 && ! Has_Size_Clause (gnat_entity))
275 /* Likewise, RM_Size must be specified for all discrete and fixed-point
277 if (IN (kind, Discrete_Or_Fixed_Point_Kind)
278 && Unknown_RM_Size (gnat_entity))
281 /* Get the name of the entity and set up the line number and filename of
282 the original definition for use in any decl we make. */
283 gnu_entity_id = get_entity_name (gnat_entity);
284 Sloc_to_locus (Sloc (gnat_entity), &input_location);
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 scopes. Don't do this for components or
303 discriminants since the relevant test is whether or not the record is
304 being defined. But do this for Imported functions or procedures in
306 if ((! definition && Is_Public (gnat_entity)
307 && ! Is_Statically_Allocated (gnat_entity)
308 && kind != E_Discriminant && kind != E_Component)
309 || (Is_Imported (gnat_entity)
310 && (kind == E_Function || kind == E_Procedure)))
311 force_global++, this_global = 1;
313 /* Handle any attributes. */
314 if (Has_Gigi_Rep_Item (gnat_entity))
315 attr_list = build_attr_list (gnat_entity);
320 /* If this is a use of a deferred constant, get its full
322 if (! definition && Present (Full_View (gnat_entity)))
324 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
325 gnu_expr, definition);
330 /* If we have an external constant that we are not defining,
331 get the expression that is was defined to represent. We
332 may throw that expression away later if it is not a
334 Do not retrieve the expression if it is an aggregate, because
335 in complex instantiation contexts it may not be expanded */
338 && Present (Expression (Declaration_Node (gnat_entity)))
339 && ! No_Initialization (Declaration_Node (gnat_entity))
340 && Nkind (Expression (Declaration_Node (gnat_entity)))
342 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
344 /* Ignore deferred constant definitions; they are processed fully in the
345 front-end. For deferred constant references, get the full
346 definition. On the other hand, constants that are renamings are
347 handled like variable renamings. If No_Initialization is set, this is
348 not a deferred constant but a constant whose value is built
351 if (definition && gnu_expr == 0
352 && ! No_Initialization (Declaration_Node (gnat_entity))
353 && No (Renamed_Object (gnat_entity)))
355 gnu_decl = error_mark_node;
359 else if (! definition && IN (kind, Incomplete_Or_Private_Kind)
360 && Present (Full_View (gnat_entity)))
362 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
371 /* We used to special case VMS exceptions here to directly map them to
372 their associated condition code. Since this code had to be masked
373 dynamically to strip off the severity bits, this caused trouble in
374 the GCC/ZCX case because the "type" pointers we store in the tables
375 have to be static. We now don't special case here anymore, and let
376 the regular processing take place, which leaves us with a regular
377 exception data object for VMS exceptions too. The condition code
378 mapping is taken care of by the front end and the bitmasking by the
385 /* The GNAT record where the component was defined. */
386 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
388 /* If the variable is an inherited record component (in the case of
389 extended record types), just return the inherited entity, which
390 must be a FIELD_DECL. Likewise for discriminants.
391 For discriminants of untagged records which have explicit
392 stored discriminants, return the entity for the corresponding
393 stored discriminant. Also use Original_Record_Component
394 if the record has a private extension. */
396 if ((Base_Type (gnat_record) == gnat_record
397 || Ekind (Scope (gnat_entity)) == E_Private_Subtype
398 || Ekind (Scope (gnat_entity)) == E_Record_Subtype_With_Private
399 || Ekind (Scope (gnat_entity)) == E_Record_Type_With_Private)
400 && Present (Original_Record_Component (gnat_entity))
401 && Original_Record_Component (gnat_entity) != gnat_entity)
404 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
405 gnu_expr, definition);
410 /* If the enclosing record has explicit stored discriminants,
411 then it is an untagged record. If the Corresponding_Discriminant
412 is not empty then this must be a renamed discriminant and its
413 Original_Record_Component must point to the corresponding explicit
414 stored discriminant (i.e., we should have taken the previous
417 else if (Present (Corresponding_Discriminant (gnat_entity))
418 && Is_Tagged_Type (gnat_record))
420 /* A tagged record has no explicit stored discriminants. */
422 if (First_Discriminant (gnat_record)
423 != First_Stored_Discriminant (gnat_record))
427 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
428 gnu_expr, definition);
433 /* If the enclosing record has explicit stored discriminants,
434 then it is an untagged record. If the Corresponding_Discriminant
435 is not empty then this must be a renamed discriminant and its
436 Original_Record_Component must point to the corresponding explicit
437 stored discriminant (i.e., we should have taken the first
440 else if (Present (Corresponding_Discriminant (gnat_entity))
441 && (First_Discriminant (gnat_record)
442 != First_Stored_Discriminant (gnat_record)))
445 /* Otherwise, if we are not defining this and we have no GCC type
446 for the containing record, make one for it. Then we should
447 have made our own equivalent. */
448 else if (! definition && ! present_gnu_tree (gnat_record))
450 /* ??? If this is in a record whose scope is a protected
451 type and we have an Original_Record_Component, use it.
452 This is a workaround for major problems in protected type
455 Entity_Id Scop = Scope (Scope (gnat_entity));
456 if ((Is_Protected_Type (Scop)
457 || (Is_Private_Type (Scop)
458 && Present (Full_View (Scop))
459 && Is_Protected_Type (Full_View (Scop))))
460 && Present (Original_Record_Component (gnat_entity)))
463 = gnat_to_gnu_entity (Original_Record_Component
465 gnu_expr, definition);
470 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
471 gnu_decl = get_gnu_tree (gnat_entity);
476 /* Here we have no GCC type and this is a reference rather than a
477 definition. This should never happen. Most likely the cause is a
478 reference before declaration in the gnat tree for gnat_entity. */
483 case E_Loop_Parameter:
484 case E_Out_Parameter:
487 /* Simple variables, loop variables, OUT parameters, and exceptions. */
492 = ((kind == E_Constant || kind == E_Variable)
493 && ! Is_Statically_Allocated (gnat_entity)
494 && Is_True_Constant (gnat_entity)
495 && (((Nkind (Declaration_Node (gnat_entity))
496 == N_Object_Declaration)
497 && Present (Expression (Declaration_Node (gnat_entity))))
498 || Present (Renamed_Object (gnat_entity))));
499 int inner_const_flag = const_flag;
500 int static_p = Is_Statically_Allocated (gnat_entity);
501 tree gnu_ext_name = NULL_TREE;
503 if (Present (Renamed_Object (gnat_entity)) && ! definition)
505 if (kind == E_Exception)
506 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
509 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
512 /* Get the type after elaborating the renamed object. */
513 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
515 /* If this is a loop variable, its type should be the base type.
516 This is because the code for processing a loop determines whether
517 a normal loop end test can be done by comparing the bounds of the
518 loop against those of the base type, which is presumed to be the
519 size used for computation. But this is not correct when the size
520 of the subtype is smaller than the type. */
521 if (kind == E_Loop_Parameter)
522 gnu_type = get_base_type (gnu_type);
524 /* Reject non-renamed objects whose types are unconstrained arrays or
525 any object whose type is a dummy type or VOID_TYPE. */
527 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
528 && No (Renamed_Object (gnat_entity)))
529 || TYPE_IS_DUMMY_P (gnu_type)
530 || TREE_CODE (gnu_type) == VOID_TYPE)
532 if (type_annotate_only)
533 return error_mark_node;
538 /* If we are defining the object, see if it has a Size value and
539 validate it if so. If we are not defining the object and a Size
540 clause applies, simply retrieve the value. We don't want to ignore
541 the clause and it is expected to have been validated already. Then
542 get the new type, if any. */
544 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
545 gnat_entity, VAR_DECL, 0,
546 Has_Size_Clause (gnat_entity));
547 else if (Has_Size_Clause (gnat_entity))
548 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
553 = make_type_from_size (gnu_type, gnu_size,
554 Has_Biased_Representation (gnat_entity));
556 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
560 /* If this object has self-referential size, it must be a record with
561 a default value. We are supposed to allocate an object of the
562 maximum size in this case unless it is a constant with an
563 initializing expression, in which case we can get the size from
564 that. Note that the resulting size may still be a variable, so
565 this may end up with an indirect allocation. */
567 if (No (Renamed_Object (gnat_entity))
568 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
570 if (gnu_expr != 0 && kind == E_Constant)
572 = SUBSTITUTE_PLACEHOLDER_IN_EXPR
573 (TYPE_SIZE (TREE_TYPE (gnu_expr)), gnu_expr);
575 /* We may have no GNU_EXPR because No_Initialization is
576 set even though there's an Expression. */
577 else if (kind == E_Constant
578 && (Nkind (Declaration_Node (gnat_entity))
579 == N_Object_Declaration)
580 && Present (Expression (Declaration_Node (gnat_entity))))
582 = TYPE_SIZE (gnat_to_gnu_type
584 (Expression (Declaration_Node (gnat_entity)))));
586 gnu_size = max_size (TYPE_SIZE (gnu_type), 1);
589 /* If the size is zero bytes, make it one byte since some linkers have
590 trouble with zero-sized objects. If the object will have a
591 template, that will make it nonzero so don't bother. Also avoid
592 doing that for an object renaming or an object with an address
593 clause, as we would lose useful information on the view size
594 (e.g. for null array slices) and we are not allocating the object
596 if (((gnu_size != 0 && integer_zerop (gnu_size))
597 || (TYPE_SIZE (gnu_type) != 0
598 && integer_zerop (TYPE_SIZE (gnu_type))))
599 && (! Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
600 || ! Is_Array_Type (Etype (gnat_entity)))
601 && ! Present (Renamed_Object (gnat_entity))
602 && ! Present (Address_Clause (gnat_entity)))
603 gnu_size = bitsize_unit_node;
605 /* If an alignment is specified, use it if valid. Note that
606 exceptions are objects but don't have alignments. */
607 if (kind != E_Exception && Known_Alignment (gnat_entity))
609 if (No (Alignment (gnat_entity)))
613 = validate_alignment (Alignment (gnat_entity), gnat_entity,
614 TYPE_ALIGN (gnu_type));
617 /* If this is an atomic object with no specified size and alignment,
618 but where the size of the type is a constant, set the alignment to
619 the lowest power of two greater than the size, or to the
620 biggest meaningful alignment, whichever is smaller. */
622 if (Is_Atomic (gnat_entity) && gnu_size == 0 && align == 0
623 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
625 if (! host_integerp (TYPE_SIZE (gnu_type), 1)
626 || 0 <= compare_tree_int (TYPE_SIZE (gnu_type),
628 align = BIGGEST_ALIGNMENT;
630 align = ((unsigned int) 1
631 << (floor_log2 (tree_low_cst
632 (TYPE_SIZE (gnu_type), 1) - 1)
636 /* If the object is set to have atomic components, find the component
637 type and validate it.
639 ??? Note that we ignore Has_Volatile_Components on objects; it's
640 not at all clear what to do in that case. */
642 if (Has_Atomic_Components (gnat_entity))
645 = (TREE_CODE (gnu_type) == ARRAY_TYPE
646 ? TREE_TYPE (gnu_type) : gnu_type);
648 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
649 && TYPE_MULTI_ARRAY_P (gnu_inner))
650 gnu_inner = TREE_TYPE (gnu_inner);
652 check_ok_for_atomic (gnu_inner, gnat_entity, 1);
655 /* Now check if the type of the object allows atomic access. Note
656 that we must test the type, even if this object has size and
657 alignment to allow such access, because we will be going
658 inside the padded record to assign to the object. We could fix
659 this by always copying via an intermediate value, but it's not
660 clear it's worth the effort. */
661 if (Is_Atomic (gnat_entity))
662 check_ok_for_atomic (gnu_type, gnat_entity, 0);
664 /* If this is an aliased object with an unconstrained nominal subtype,
665 make a type that includes the template. */
666 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
667 && Is_Array_Type (Etype (gnat_entity))
668 && ! type_annotate_only)
671 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
673 = TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_fat))));
676 = build_unc_object_type (gnu_temp_type, gnu_type,
677 concat_id_with_name (gnu_entity_id,
681 #ifdef MINIMUM_ATOMIC_ALIGNMENT
682 /* If the size is a constant and no alignment is specified, force
683 the alignment to be the minimum valid atomic alignment. The
684 restriction on constant size avoids problems with variable-size
685 temporaries; if the size is variable, there's no issue with
686 atomic access. Also don't do this for a constant, since it isn't
687 necessary and can interfere with constant replacement. Finally,
688 do not do it for Out parameters since that creates an
689 size inconsistency with In parameters. */
690 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
691 && ! FLOAT_TYPE_P (gnu_type)
692 && ! const_flag && No (Renamed_Object (gnat_entity))
693 && ! imported_p && No (Address_Clause (gnat_entity))
694 && kind != E_Out_Parameter
695 && (gnu_size != 0 ? TREE_CODE (gnu_size) == INTEGER_CST
696 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
697 align = MINIMUM_ATOMIC_ALIGNMENT;
700 /* Make a new type with the desired size and alignment, if needed. */
701 gnu_type = maybe_pad_type (gnu_type, gnu_size, align,
702 gnat_entity, "PAD", 0, definition, 1);
704 /* Make a volatile version of this object's type if we are to
705 make the object volatile. Note that 13.3(19) says that we
706 should treat other types of objects as volatile as well. */
707 if ((Treat_As_Volatile (gnat_entity)
708 || Is_Exported (gnat_entity)
709 || Is_Imported (gnat_entity)
710 || Present (Address_Clause (gnat_entity)))
711 && ! TYPE_VOLATILE (gnu_type))
712 gnu_type = build_qualified_type (gnu_type,
713 (TYPE_QUALS (gnu_type)
714 | TYPE_QUAL_VOLATILE));
716 /* Convert the expression to the type of the object except in the
717 case where the object's type is unconstrained or the object's type
718 is a padded record whose field is of self-referential size. In
719 the former case, converting will generate unnecessary evaluations
720 of the CONSTRUCTOR to compute the size and in the latter case, we
721 want to only copy the actual data. */
723 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
724 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
725 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
726 && TYPE_IS_PADDING_P (gnu_type)
727 && (CONTAINS_PLACEHOLDER_P
728 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
729 gnu_expr = convert (gnu_type, gnu_expr);
731 /* See if this is a renaming. If this is a constant renaming,
732 treat it as a normal variable whose initial value is what
733 is being renamed. We cannot do this if the type is
734 unconstrained or class-wide.
736 Otherwise, if what we are renaming is a reference, we can simply
737 return a stabilized version of that reference, after forcing
738 any SAVE_EXPRs to be evaluated. But, if this is at global level,
739 we can only do this if we know no SAVE_EXPRs will be made.
740 Otherwise, make this into a constant pointer to the object we are
743 if (Present (Renamed_Object (gnat_entity)))
745 /* If the renamed object had padding, strip off the reference
746 to the inner object and reset our type. */
747 if (TREE_CODE (gnu_expr) == COMPONENT_REF
748 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
750 && (TYPE_IS_PADDING_P
751 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
753 gnu_expr = TREE_OPERAND (gnu_expr, 0);
754 gnu_type = TREE_TYPE (gnu_expr);
758 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
759 && TYPE_MODE (gnu_type) != BLKmode
760 && Ekind (Etype (gnat_entity)) != E_Class_Wide_Type
761 && !Is_Array_Type (Etype (gnat_entity)))
764 /* If this is a declaration or reference, we can just use that
765 declaration or reference as this entity. */
766 else if ((DECL_P (gnu_expr)
767 || TREE_CODE_CLASS (TREE_CODE (gnu_expr)) == 'r')
768 && ! Materialize_Entity (gnat_entity)
769 && (! global_bindings_p ()
770 || (staticp (gnu_expr)
771 && ! TREE_SIDE_EFFECTS (gnu_expr))))
773 gnu_decl = gnat_stabilize_reference (gnu_expr, 1);
774 save_gnu_tree (gnat_entity, gnu_decl, 1);
780 inner_const_flag = TREE_READONLY (gnu_expr);
782 gnu_type = build_reference_type (gnu_type);
783 gnu_expr = build_unary_op (ADDR_EXPR, gnu_type, gnu_expr);
789 /* If this is an aliased object whose nominal subtype is unconstrained,
790 the object is a record that contains both the template and
791 the object. If there is an initializer, it will have already
792 been converted to the right type, but we need to create the
793 template if there is no initializer. */
794 else if (definition && TREE_CODE (gnu_type) == RECORD_TYPE
795 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
796 /* Beware that padding might have been introduced
797 via maybe_pad_type above. */
798 || (TYPE_IS_PADDING_P (gnu_type)
799 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
801 && TYPE_CONTAINS_TEMPLATE_P
802 (TREE_TYPE (TYPE_FIELDS (gnu_type)))))
806 = TYPE_IS_PADDING_P (gnu_type)
807 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
808 : TYPE_FIELDS (gnu_type);
811 = gnat_build_constructor
815 build_template (TREE_TYPE (template_field),
816 TREE_TYPE (TREE_CHAIN (template_field)),
821 /* If this is a pointer and it does not have an initializing
822 expression, initialize it to NULL, unless the obect is
825 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
826 && !Is_Imported (gnat_entity)
828 gnu_expr = integer_zero_node;
830 /* If we are defining the object and it has an Address clause we must
831 get the address expression from the saved GCC tree for the
832 object if the object has a Freeze_Node. Otherwise, we elaborate
833 the address expression here since the front-end has guaranteed
834 in that case that the elaboration has no effects. Note that
835 only the latter mechanism is currently in use. */
836 if (definition && Present (Address_Clause (gnat_entity)))
839 = (present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity)
840 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
842 save_gnu_tree (gnat_entity, NULL_TREE, 0);
844 /* Ignore the size. It's either meaningless or was handled
847 gnu_type = build_reference_type (gnu_type);
848 gnu_address = convert (gnu_type, gnu_address);
850 const_flag = ! Is_Public (gnat_entity);
852 /* If we don't have an initializing expression for the underlying
853 variable, the initializing expression for the pointer is the
854 specified address. Otherwise, we have to make a COMPOUND_EXPR
855 to assign both the address and the initial value. */
857 gnu_expr = gnu_address;
860 = build (COMPOUND_EXPR, gnu_type,
862 (MODIFY_EXPR, NULL_TREE,
863 build_unary_op (INDIRECT_REF, NULL_TREE,
869 /* If it has an address clause and we are not defining it, mark it
870 as an indirect object. Likewise for Stdcall objects that are
872 if ((! definition && Present (Address_Clause (gnat_entity)))
873 || (Is_Imported (gnat_entity)
874 && Convention (gnat_entity) == Convention_Stdcall))
876 gnu_type = build_reference_type (gnu_type);
881 /* If we are at top level and this object is of variable size,
882 make the actual type a hidden pointer to the real type and
883 make the initializer be a memory allocation and initialization.
884 Likewise for objects we aren't defining (presumed to be
885 external references from other packages), but there we do
886 not set up an initialization.
888 If the object's size overflows, make an allocator too, so that
889 Storage_Error gets raised. Note that we will never free
890 such memory, so we presume it never will get allocated. */
892 if (! allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
893 global_bindings_p () || ! definition
896 && ! allocatable_size_p (gnu_size,
897 global_bindings_p () || ! definition
900 gnu_type = build_reference_type (gnu_type);
905 /* Get the data part of GNU_EXPR in case this was a
906 aliased object whose nominal subtype is unconstrained.
907 In that case the pointer above will be a thin pointer and
908 build_allocator will automatically make the template and
909 constructor already made above. */
913 tree gnu_alloc_type = TREE_TYPE (gnu_type);
915 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
916 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
919 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
921 = build_component_ref
922 (gnu_expr, NULL_TREE,
923 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), 0);
926 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
927 && TREE_CONSTANT_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
928 && ! Is_Imported (gnat_entity))
929 post_error ("Storage_Error will be raised at run-time?",
932 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr,
933 gnu_type, 0, 0, gnat_entity);
942 /* If this object would go into the stack and has an alignment
943 larger than the default largest alignment, make a variable
944 to hold the "aligning type" with a modified initial value,
945 if any, then point to it and make that the value of this
946 variable, which is now indirect. */
948 if (! global_bindings_p () && ! static_p && definition
949 && ! imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
952 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
953 TYPE_SIZE_UNIT (gnu_type));
957 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
958 NULL_TREE, gnu_new_type, gnu_expr,
960 annotate_decl_with_node (gnu_new_var, gnat_entity);
961 add_decl_stmt (gnu_new_var, gnat_entity);
965 (build_binary_op (MODIFY_EXPR, NULL_TREE,
967 (gnu_new_var, NULL_TREE,
968 TYPE_FIELDS (gnu_new_type), 0),
972 gnu_type = build_reference_type (gnu_type);
975 (ADDR_EXPR, gnu_type,
976 build_component_ref (gnu_new_var, NULL_TREE,
977 TYPE_FIELDS (gnu_new_type), 0));
984 /* Convert the expression to the type of the object except in the
985 case where the object's type is unconstrained or the object's type
986 is a padded record whose field is of self-referential size. In
987 the former case, converting will generate unnecessary evaluations
988 of the CONSTRUCTOR to compute the size and in the latter case, we
989 want to only copy the actual data. */
991 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
992 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
993 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
994 && TYPE_IS_PADDING_P (gnu_type)
995 && (CONTAINS_PLACEHOLDER_P
996 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
997 gnu_expr = convert (gnu_type, gnu_expr);
999 /* If this name is external or there was a name specified, use it,
1000 unless this is a VMS exception object since this would conflict
1001 with the symbol we need to export in addition. Don't use the
1002 Interface_Name if there is an address clause (see CD30005). */
1003 if (! Is_VMS_Exception (gnat_entity)
1005 ((Present (Interface_Name (gnat_entity))
1006 && No (Address_Clause (gnat_entity)))
1008 (Is_Public (gnat_entity)
1009 && (! Is_Imported (gnat_entity) || Is_Exported (gnat_entity)))))
1010 gnu_ext_name = create_concat_name (gnat_entity, 0);
1013 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1014 | TYPE_QUAL_CONST));
1016 /* If this is constant initialized to a static constant and the
1017 object has an aggregrate type, force it to be statically
1019 if (const_flag && gnu_expr && TREE_CONSTANT (gnu_expr)
1020 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1021 && (AGGREGATE_TYPE_P (gnu_type)
1022 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
1023 && TYPE_IS_PADDING_P (gnu_type))))
1026 gnu_decl = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1027 gnu_expr, const_flag,
1028 Is_Public (gnat_entity),
1029 imported_p || !definition,
1030 static_p, attr_list);
1031 annotate_decl_with_node (gnu_decl, gnat_entity);
1032 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1033 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1035 /* If we have an address clause and we've made this indirect, it's
1036 not enough to merely mark the type as volatile since volatile
1037 references only conflict with other volatile references while this
1038 reference must conflict with all other references. So ensure that
1039 the dereferenced value has alias set 0. */
1040 if (Present (Address_Clause (gnat_entity)) && used_by_ref)
1041 DECL_POINTER_ALIAS_SET (gnu_decl) = 0;
1043 add_decl_stmt (gnu_decl, gnat_entity);
1045 if (definition && DECL_SIZE (gnu_decl) != 0
1046 && get_block_jmpbuf_decl ()
1047 && (TREE_CODE (DECL_SIZE (gnu_decl)) != INTEGER_CST
1048 || (flag_stack_check && ! STACK_CHECK_BUILTIN
1049 && 0 < compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1050 STACK_CHECK_MAX_VAR_SIZE))))
1051 add_stmt_with_node (build_call_1_expr
1052 (update_setjmp_buf_decl,
1053 build_unary_op (ADDR_EXPR, NULL_TREE,
1054 get_block_jmpbuf_decl ())),
1057 /* If this is a public constant or we're not optimizing and we're not
1058 making a VAR_DECL for it, make one just for export or debugger
1059 use. Likewise if the address is taken or if the object or type is
1061 if (definition && TREE_CODE (gnu_decl) == CONST_DECL
1062 && (Is_Public (gnat_entity)
1064 || Address_Taken (gnat_entity)
1065 || Is_Aliased (gnat_entity)
1066 || Is_Aliased (Etype (gnat_entity))))
1069 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1070 gnu_expr, 0, Is_Public (gnat_entity), 0,
1073 add_decl_stmt (gnu_corr_var, gnat_entity);
1074 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1077 /* If this is declared in a block that contains an block with an
1078 exception handler, we must force this variable in memory to
1079 suppress an invalid optimization. */
1080 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1081 && Exception_Mechanism != GCC_ZCX)
1082 TREE_ADDRESSABLE (gnu_decl) = 1;
1084 /* Back-annotate the Alignment of the object if not already in the
1085 tree. Likewise for Esize if the object is of a constant size.
1086 But if the "object" is actually a pointer to an object, the
1087 alignment and size are the same as teh type, so don't back-annotate
1088 the values for the pointer. */
1089 if (! used_by_ref && Unknown_Alignment (gnat_entity))
1090 Set_Alignment (gnat_entity,
1091 UI_From_Int (DECL_ALIGN (gnu_decl) / BITS_PER_UNIT));
1093 if (! used_by_ref && Unknown_Esize (gnat_entity)
1094 && DECL_SIZE (gnu_decl) != 0)
1096 tree gnu_back_size = DECL_SIZE (gnu_decl);
1098 if (TREE_CODE (TREE_TYPE (gnu_decl)) == RECORD_TYPE
1099 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_decl)))
1101 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN
1102 (TYPE_FIELDS (TREE_TYPE (gnu_decl)))));
1104 Set_Esize (gnat_entity, annotate_value (gnu_back_size));
1110 /* Return a TYPE_DECL for "void" that we previously made. */
1111 gnu_decl = void_type_decl_node;
1114 case E_Enumeration_Type:
1115 /* A special case, for the types Character and Wide_Character in
1116 Standard, we do not list all the literals. So if the literals
1117 are not specified, make this an unsigned type. */
1118 if (No (First_Literal (gnat_entity)))
1120 gnu_type = make_unsigned_type (esize);
1124 /* Normal case of non-character type, or non-Standard character type */
1126 /* Here we have a list of enumeral constants in First_Literal.
1127 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1128 the list to be places into TYPE_FIELDS. Each node in the list
1129 is a TREE_LIST node whose TREE_VALUE is the literal name
1130 and whose TREE_PURPOSE is the value of the literal.
1132 Esize contains the number of bits needed to represent the enumeral
1133 type, Type_Low_Bound also points to the first literal and
1134 Type_High_Bound points to the last literal. */
1136 Entity_Id gnat_literal;
1137 tree gnu_literal_list = NULL_TREE;
1139 if (Is_Unsigned_Type (gnat_entity))
1140 gnu_type = make_unsigned_type (esize);
1142 gnu_type = make_signed_type (esize);
1144 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1146 for (gnat_literal = First_Literal (gnat_entity);
1147 Present (gnat_literal);
1148 gnat_literal = Next_Literal (gnat_literal))
1150 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1153 = create_var_decl (get_entity_name (gnat_literal),
1154 0, gnu_type, gnu_value, 1, 0, 0, 0, 0);
1156 add_decl_stmt (gnu_literal, gnat_literal);
1157 save_gnu_tree (gnat_literal, gnu_literal, 0);
1158 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1159 gnu_value, gnu_literal_list);
1162 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1164 /* Note that the bounds are updated at the end of this function
1165 because to avoid an infinite recursion when we get the bounds of
1166 this type, since those bounds are objects of this type. */
1170 case E_Signed_Integer_Type:
1171 case E_Ordinary_Fixed_Point_Type:
1172 case E_Decimal_Fixed_Point_Type:
1173 /* For integer types, just make a signed type the appropriate number
1175 gnu_type = make_signed_type (esize);
1178 case E_Modular_Integer_Type:
1179 /* For modular types, make the unsigned type of the proper number of
1180 bits and then set up the modulus, if required. */
1182 enum machine_mode mode;
1186 if (Is_Packed_Array_Type (gnat_entity))
1187 esize = UI_To_Int (RM_Size (gnat_entity));
1189 /* Find the smallest mode at least ESIZE bits wide and make a class
1192 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1193 GET_MODE_BITSIZE (mode) < esize;
1194 mode = GET_MODE_WIDER_MODE (mode))
1197 gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode));
1198 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
1199 = Is_Packed_Array_Type (gnat_entity);
1201 /* Get the modulus in this type. If it overflows, assume it is because
1202 it is equal to 2**Esize. Note that there is no overflow checking
1203 done on unsigned type, so we detect the overflow by looking for
1204 a modulus of zero, which is otherwise invalid. */
1205 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1207 if (! integer_zerop (gnu_modulus))
1209 TYPE_MODULAR_P (gnu_type) = 1;
1210 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1211 gnu_high = fold (build (MINUS_EXPR, gnu_type, gnu_modulus,
1212 convert (gnu_type, integer_one_node)));
1215 /* If we have to set TYPE_PRECISION different from its natural value,
1216 make a subtype to do do. Likewise if there is a modulus and
1217 it is not one greater than TYPE_MAX_VALUE. */
1218 if (TYPE_PRECISION (gnu_type) != esize
1219 || (TYPE_MODULAR_P (gnu_type)
1220 && ! tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high)))
1222 tree gnu_subtype = make_node (INTEGER_TYPE);
1224 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1225 TREE_TYPE (gnu_subtype) = gnu_type;
1226 TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type);
1227 TYPE_MAX_VALUE (gnu_subtype)
1228 = TYPE_MODULAR_P (gnu_type)
1229 ? gnu_high : TYPE_MAX_VALUE (gnu_type);
1230 TYPE_PRECISION (gnu_subtype) = esize;
1231 TYPE_UNSIGNED (gnu_subtype) = 1;
1232 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1233 TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype)
1234 = Is_Packed_Array_Type (gnat_entity);
1235 layout_type (gnu_subtype);
1237 gnu_type = gnu_subtype;
1242 case E_Signed_Integer_Subtype:
1243 case E_Enumeration_Subtype:
1244 case E_Modular_Integer_Subtype:
1245 case E_Ordinary_Fixed_Point_Subtype:
1246 case E_Decimal_Fixed_Point_Subtype:
1248 /* For integral subtypes, we make a new INTEGER_TYPE. Note
1249 that we do not want to call build_range_type since we would
1250 like each subtype node to be distinct. This will be important
1251 when memory aliasing is implemented.
1253 The TREE_TYPE field of the INTEGER_TYPE we make points to the
1254 parent type; this fact is used by the arithmetic conversion
1257 We elaborate the Ancestor_Subtype if it is not in the current
1258 unit and one of our bounds is non-static. We do this to ensure
1259 consistent naming in the case where several subtypes share the same
1260 bounds by always elaborating the first such subtype first, thus
1264 && Present (Ancestor_Subtype (gnat_entity))
1265 && ! In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1266 && (! Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1267 || ! Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1268 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1269 gnu_expr, definition);
1271 gnu_type = make_node (INTEGER_TYPE);
1272 if (Is_Packed_Array_Type (gnat_entity))
1274 esize = UI_To_Int (RM_Size (gnat_entity));
1275 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1278 TYPE_PRECISION (gnu_type) = esize;
1279 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1281 TYPE_MIN_VALUE (gnu_type)
1282 = convert (TREE_TYPE (gnu_type),
1283 elaborate_expression (Type_Low_Bound (gnat_entity),
1285 get_identifier ("L"), definition, 1,
1286 Needs_Debug_Info (gnat_entity)));
1288 TYPE_MAX_VALUE (gnu_type)
1289 = convert (TREE_TYPE (gnu_type),
1290 elaborate_expression (Type_High_Bound (gnat_entity),
1292 get_identifier ("U"), definition, 1,
1293 Needs_Debug_Info (gnat_entity)));
1295 /* One of the above calls might have caused us to be elaborated,
1296 so don't blow up if so. */
1297 if (present_gnu_tree (gnat_entity))
1303 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1304 = Has_Biased_Representation (gnat_entity);
1306 /* This should be an unsigned type if the lower bound is constant
1307 and non-negative or if the base type is unsigned; a signed type
1309 TYPE_UNSIGNED (gnu_type)
1310 = (TYPE_UNSIGNED (TREE_TYPE (gnu_type))
1311 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
1312 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
1313 || TYPE_BIASED_REPRESENTATION_P (gnu_type)
1314 || Is_Unsigned_Type (gnat_entity));
1316 layout_type (gnu_type);
1318 /* If the type we are dealing with is to represent a packed array,
1319 we need to have the bits left justified on big-endian targets
1320 (see exp_packd.ads). We build a record with a bitfield of the
1321 appropriate size to achieve this. */
1322 if (Is_Packed_Array_Type (gnat_entity) && BYTES_BIG_ENDIAN)
1324 tree gnu_field_type = gnu_type;
1327 TYPE_RM_SIZE_INT (gnu_field_type)
1328 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1329 gnu_type = make_node (RECORD_TYPE);
1330 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "LJM");
1331 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1332 TYPE_PACKED (gnu_type) = 1;
1334 /* Don't notify the field as "addressable", since we won't be taking
1335 it's address and it would prevent create_field_decl from making a
1337 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1338 gnu_field_type, gnu_type, 1, 0, 0, 0);
1340 finish_record_type (gnu_type, gnu_field, 0, 0);
1341 TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1342 SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize));
1347 case E_Floating_Point_Type:
1348 /* If this is a VAX floating-point type, use an integer of the proper
1349 size. All the operations will be handled with ASM statements. */
1350 if (Vax_Float (gnat_entity))
1352 gnu_type = make_signed_type (esize);
1353 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1354 SET_TYPE_DIGITS_VALUE (gnu_type,
1355 UI_To_gnu (Digits_Value (gnat_entity),
1360 /* The type of the Low and High bounds can be our type if this is
1361 a type from Standard, so set them at the end of the function. */
1362 gnu_type = make_node (REAL_TYPE);
1363 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1364 layout_type (gnu_type);
1367 case E_Floating_Point_Subtype:
1368 if (Vax_Float (gnat_entity))
1370 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1376 && Present (Ancestor_Subtype (gnat_entity))
1377 && ! In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1378 && (! Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1379 || ! Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1380 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1381 gnu_expr, definition);
1383 gnu_type = make_node (REAL_TYPE);
1384 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1385 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1387 TYPE_MIN_VALUE (gnu_type)
1388 = convert (TREE_TYPE (gnu_type),
1389 elaborate_expression (Type_Low_Bound (gnat_entity),
1390 gnat_entity, get_identifier ("L"),
1392 Needs_Debug_Info (gnat_entity)));
1394 TYPE_MAX_VALUE (gnu_type)
1395 = convert (TREE_TYPE (gnu_type),
1396 elaborate_expression (Type_High_Bound (gnat_entity),
1397 gnat_entity, get_identifier ("U"),
1399 Needs_Debug_Info (gnat_entity)));
1401 /* One of the above calls might have caused us to be elaborated,
1402 so don't blow up if so. */
1403 if (present_gnu_tree (gnat_entity))
1409 layout_type (gnu_type);
1413 /* Array and String Types and Subtypes
1415 Unconstrained array types are represented by E_Array_Type and
1416 constrained array types are represented by E_Array_Subtype. There
1417 are no actual objects of an unconstrained array type; all we have
1418 are pointers to that type.
1420 The following fields are defined on array types and subtypes:
1422 Component_Type Component type of the array.
1423 Number_Dimensions Number of dimensions (an int).
1424 First_Index Type of first index. */
1429 tree gnu_template_fields = NULL_TREE;
1430 tree gnu_template_type = make_node (RECORD_TYPE);
1431 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1432 tree gnu_fat_type = make_node (RECORD_TYPE);
1433 int ndim = Number_Dimensions (gnat_entity);
1435 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1437 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1438 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
1439 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
1440 tree gnu_comp_size = 0;
1441 tree gnu_max_size = size_one_node;
1442 tree gnu_max_size_unit;
1444 Entity_Id gnat_ind_subtype;
1445 Entity_Id gnat_ind_base_subtype;
1446 tree gnu_template_reference;
1449 TYPE_NAME (gnu_template_type)
1450 = create_concat_name (gnat_entity, "XUB");
1451 TYPE_NAME (gnu_fat_type) = create_concat_name (gnat_entity, "XUP");
1452 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1453 TYPE_READONLY (gnu_template_type) = 1;
1455 /* Make a node for the array. If we are not defining the array
1456 suppress expanding incomplete types and save the node as the type
1458 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1461 defer_incomplete_level++;
1462 this_deferred = this_made_decl = 1;
1463 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
1464 ! Comes_From_Source (gnat_entity),
1466 save_gnu_tree (gnat_entity, gnu_decl, 0);
1470 /* Build the fat pointer type. Use a "void *" object instead of
1471 a pointer to the array type since we don't have the array type
1472 yet (it will reference the fat pointer via the bounds). */
1473 tem = chainon (chainon (NULL_TREE,
1474 create_field_decl (get_identifier ("P_ARRAY"),
1476 gnu_fat_type, 0, 0, 0, 0)),
1477 create_field_decl (get_identifier ("P_BOUNDS"),
1479 gnu_fat_type, 0, 0, 0, 0));
1481 /* Make sure we can put this into a register. */
1482 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1483 finish_record_type (gnu_fat_type, tem, 0, 1);
1485 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1486 is the fat pointer. This will be used to access the individual
1487 fields once we build them. */
1488 tem = build (COMPONENT_REF, gnu_ptr_template,
1489 build (PLACEHOLDER_EXPR, gnu_fat_type),
1490 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)));
1491 gnu_template_reference
1492 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1493 TREE_READONLY (gnu_template_reference) = 1;
1495 /* Now create the GCC type for each index and add the fields for
1496 that index to the template. */
1497 for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
1498 gnat_ind_base_subtype
1499 = First_Index (Implementation_Base_Type (gnat_entity));
1500 index < ndim && index >= 0;
1502 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1503 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1505 char field_name[10];
1506 tree gnu_ind_subtype
1507 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1508 tree gnu_base_subtype
1509 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1511 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1513 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1514 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1516 /* Make the FIELD_DECLs for the minimum and maximum of this
1517 type and then make extractions of that field from the
1519 sprintf (field_name, "LB%d", index);
1520 gnu_min_field = create_field_decl (get_identifier (field_name),
1522 gnu_template_type, 0, 0, 0, 0);
1523 field_name[0] = 'U';
1524 gnu_max_field = create_field_decl (get_identifier (field_name),
1526 gnu_template_type, 0, 0, 0, 0);
1528 annotate_decl_with_node (gnu_min_field, gnat_entity);
1529 annotate_decl_with_node (gnu_max_field, gnat_entity);
1530 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1532 /* We can't use build_component_ref here since the template
1533 type isn't complete yet. */
1534 gnu_min = build (COMPONENT_REF, gnu_ind_subtype,
1535 gnu_template_reference, gnu_min_field);
1536 gnu_max = build (COMPONENT_REF, gnu_ind_subtype,
1537 gnu_template_reference, gnu_max_field);
1538 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1540 /* Make a range type with the new ranges, but using
1541 the Ada subtype. Then we convert to sizetype. */
1542 gnu_index_types[index]
1543 = create_index_type (convert (sizetype, gnu_min),
1544 convert (sizetype, gnu_max),
1545 build_range_type (gnu_ind_subtype,
1547 /* Update the maximum size of the array, in elements. */
1549 = size_binop (MULT_EXPR, gnu_max_size,
1550 size_binop (PLUS_EXPR, size_one_node,
1551 size_binop (MINUS_EXPR, gnu_base_max,
1554 TYPE_NAME (gnu_index_types[index])
1555 = create_concat_name (gnat_entity, field_name);
1558 for (index = 0; index < ndim; index++)
1560 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1562 /* Install all the fields into the template. */
1563 finish_record_type (gnu_template_type, gnu_template_fields, 0, 0);
1564 TYPE_READONLY (gnu_template_type) = 1;
1566 /* Now make the array of arrays and update the pointer to the array
1567 in the fat pointer. Note that it is the first field. */
1569 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1571 /* Get and validate any specified Component_Size, but if Packed,
1572 ignore it since the front end will have taken care of it. */
1574 = validate_size (Component_Size (gnat_entity), tem,
1576 (Is_Bit_Packed_Array (gnat_entity)
1577 ? TYPE_DECL : VAR_DECL), 1,
1578 Has_Component_Size_Clause (gnat_entity));
1580 if (Has_Atomic_Components (gnat_entity))
1581 check_ok_for_atomic (tem, gnat_entity, 1);
1583 /* If the component type is a RECORD_TYPE that has a self-referential
1584 size, use the maxium size. */
1585 if (gnu_comp_size == 0 && TREE_CODE (tem) == RECORD_TYPE
1586 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1587 gnu_comp_size = max_size (TYPE_SIZE (tem), 1);
1589 if (! Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size != 0)
1591 tem = make_type_from_size (tem, gnu_comp_size, 0);
1592 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1593 "C_PAD", 0, definition, 1);
1596 if (Has_Volatile_Components (gnat_entity))
1597 tem = build_qualified_type (tem,
1598 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1600 /* If Component_Size is not already specified, annotate it with the
1601 size of the component. */
1602 if (Unknown_Component_Size (gnat_entity))
1603 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1605 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
1606 size_binop (MULT_EXPR, gnu_max_size,
1607 TYPE_SIZE_UNIT (tem)));
1608 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
1609 size_binop (MULT_EXPR,
1610 convert (bitsizetype,
1614 for (index = ndim - 1; index >= 0; index--)
1616 tem = build_array_type (tem, gnu_index_types[index]);
1617 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1619 /* If the type below this an multi-array type, then this
1620 does not not have aliased components.
1622 ??? Otherwise, for now, we say that any component of aggregate
1623 type is addressable because the front end may take 'Reference
1624 of it. But we have to make it addressable if it must be passed
1625 by reference or it that is the default. */
1626 TYPE_NONALIASED_COMPONENT (tem)
1627 = ((TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
1628 && TYPE_MULTI_ARRAY_P (TREE_TYPE (tem))) ? 1
1629 : (! Has_Aliased_Components (gnat_entity)
1630 && ! AGGREGATE_TYPE_P (TREE_TYPE (tem))));
1633 /* If an alignment is specified, use it if valid. But ignore it for
1634 types that represent the unpacked base type for packed arrays. */
1635 if (No (Packed_Array_Type (gnat_entity))
1636 && Known_Alignment (gnat_entity))
1638 if (No (Alignment (gnat_entity)))
1642 = validate_alignment (Alignment (gnat_entity), gnat_entity,
1646 TYPE_CONVENTION_FORTRAN_P (tem)
1647 = (Convention (gnat_entity) == Convention_Fortran);
1648 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
1650 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
1651 corresponding fat pointer. */
1652 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
1653 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
1654 TYPE_MODE (gnu_type) = BLKmode;
1655 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
1656 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
1658 /* If the maximum size doesn't overflow, use it. */
1659 if (TREE_CODE (gnu_max_size) == INTEGER_CST
1660 && ! TREE_OVERFLOW (gnu_max_size))
1662 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
1663 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
1664 && ! TREE_OVERFLOW (gnu_max_size_unit))
1665 TYPE_SIZE_UNIT (tem)
1666 = size_binop (MIN_EXPR, gnu_max_size_unit,
1667 TYPE_SIZE_UNIT (tem));
1669 create_type_decl (create_concat_name (gnat_entity, "XUA"),
1670 tem, 0, ! Comes_From_Source (gnat_entity),
1672 rest_of_type_compilation (gnu_fat_type, global_bindings_p ());
1674 /* Create a record type for the object and its template and
1675 set the template at a negative offset. */
1676 tem = build_unc_object_type (gnu_template_type, tem,
1677 create_concat_name (gnat_entity, "XUT"));
1678 DECL_FIELD_OFFSET (TYPE_FIELDS (tem))
1679 = size_binop (MINUS_EXPR, size_zero_node,
1680 byte_position (TREE_CHAIN (TYPE_FIELDS (tem))));
1681 DECL_FIELD_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem))) = size_zero_node;
1682 DECL_FIELD_BIT_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem)))
1683 = bitsize_zero_node;
1684 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
1685 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
1687 /* Give the thin pointer type a name. */
1688 create_type_decl (create_concat_name (gnat_entity, "XUX"),
1689 build_pointer_type (tem), 0,
1690 ! Comes_From_Source (gnat_entity), debug_info_p);
1694 case E_String_Subtype:
1695 case E_Array_Subtype:
1697 /* This is the actual data type for array variables. Multidimensional
1698 arrays are implemented in the gnu tree as arrays of arrays. Note
1699 that for the moment arrays which have sparse enumeration subtypes as
1700 index components create sparse arrays, which is obviously space
1701 inefficient but so much easier to code for now.
1703 Also note that the subtype never refers to the unconstrained
1704 array type, which is somewhat at variance with Ada semantics.
1706 First check to see if this is simply a renaming of the array
1707 type. If so, the result is the array type. */
1709 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1710 if (! Is_Constrained (gnat_entity))
1715 int array_dim = Number_Dimensions (gnat_entity);
1717 = ((Convention (gnat_entity) == Convention_Fortran)
1718 ? array_dim - 1 : 0);
1720 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
1721 Entity_Id gnat_ind_subtype;
1722 Entity_Id gnat_ind_base_subtype;
1723 tree gnu_base_type = gnu_type;
1724 tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
1725 tree gnu_comp_size = 0;
1726 tree gnu_max_size = size_one_node;
1727 tree gnu_max_size_unit;
1728 int need_index_type_struct = 0;
1729 int max_overflow = 0;
1731 /* First create the gnu types for each index. Create types for
1732 debugging information to point to the index types if the
1733 are not integer types, have variable bounds, or are
1734 wider than sizetype. */
1736 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
1737 gnat_ind_base_subtype
1738 = First_Index (Implementation_Base_Type (gnat_entity));
1739 index < array_dim && index >= 0;
1741 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1742 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1744 tree gnu_index_subtype
1745 = get_unpadded_type (Etype (gnat_ind_subtype));
1747 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
1749 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
1750 tree gnu_base_subtype
1751 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1753 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1755 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1756 tree gnu_base_type = get_base_type (gnu_base_subtype);
1757 tree gnu_base_base_min
1758 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
1759 tree gnu_base_base_max
1760 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
1764 /* If the minimum and maximum values both overflow in
1765 SIZETYPE, but the difference in the original type
1766 does not overflow in SIZETYPE, ignore the overflow
1768 if ((TYPE_PRECISION (gnu_index_subtype)
1769 > TYPE_PRECISION (sizetype))
1770 && TREE_CODE (gnu_min) == INTEGER_CST
1771 && TREE_CODE (gnu_max) == INTEGER_CST
1772 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
1774 (fold (build (MINUS_EXPR, gnu_index_subtype,
1775 TYPE_MAX_VALUE (gnu_index_subtype),
1776 TYPE_MIN_VALUE (gnu_index_subtype))))))
1777 TREE_OVERFLOW (gnu_min) = TREE_OVERFLOW (gnu_max)
1778 = TREE_CONSTANT_OVERFLOW (gnu_min)
1779 = TREE_CONSTANT_OVERFLOW (gnu_max) = 0;
1781 /* Similarly, if the range is null, use bounds of 1..0 for
1782 the sizetype bounds. */
1783 else if ((TYPE_PRECISION (gnu_index_subtype)
1784 > TYPE_PRECISION (sizetype))
1785 && TREE_CODE (gnu_min) == INTEGER_CST
1786 && TREE_CODE (gnu_max) == INTEGER_CST
1787 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
1788 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
1789 TYPE_MIN_VALUE (gnu_index_subtype)))
1790 gnu_min = size_one_node, gnu_max = size_zero_node;
1792 /* Now compute the size of this bound. We need to provide
1793 GCC with an upper bound to use but have to deal with the
1794 "superflat" case. There are three ways to do this. If we
1795 can prove that the array can never be superflat, we can
1796 just use the high bound of the index subtype. If we can
1797 prove that the low bound minus one can't overflow, we
1798 can do this as MAX (hb, lb - 1). Otherwise, we have to use
1799 the expression hb >= lb ? hb : lb - 1. */
1800 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
1802 /* See if the base array type is already flat. If it is, we
1803 are probably compiling an ACVC test, but it will cause the
1804 code below to malfunction if we don't handle it specially. */
1805 if (TREE_CODE (gnu_base_min) == INTEGER_CST
1806 && TREE_CODE (gnu_base_max) == INTEGER_CST
1807 && ! TREE_CONSTANT_OVERFLOW (gnu_base_min)
1808 && ! TREE_CONSTANT_OVERFLOW (gnu_base_max)
1809 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
1810 gnu_high = size_zero_node, gnu_min = size_one_node;
1812 /* If gnu_high is now an integer which overflowed, the array
1813 cannot be superflat. */
1814 else if (TREE_CODE (gnu_high) == INTEGER_CST
1815 && TREE_OVERFLOW (gnu_high))
1817 else if (TYPE_UNSIGNED (gnu_base_subtype)
1818 || TREE_CODE (gnu_high) == INTEGER_CST)
1819 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
1823 (sizetype, build_binary_op (GE_EXPR, integer_type_node,
1827 gnu_index_type[index]
1828 = create_index_type (gnu_min, gnu_high, gnu_index_subtype);
1830 /* Also compute the maximum size of the array. Here we
1831 see if any constraint on the index type of the base type
1832 can be used in the case of self-referential bound on
1833 the index type of the subtype. We look for a non-"infinite"
1834 and non-self-referential bound from any type involved and
1835 handle each bound separately. */
1837 if ((TREE_CODE (gnu_min) == INTEGER_CST
1838 && ! TREE_OVERFLOW (gnu_min)
1839 && ! operand_equal_p (gnu_min, gnu_base_base_min, 0))
1840 || ! CONTAINS_PLACEHOLDER_P (gnu_min))
1841 gnu_base_min = gnu_min;
1843 if ((TREE_CODE (gnu_max) == INTEGER_CST
1844 && ! TREE_OVERFLOW (gnu_max)
1845 && ! operand_equal_p (gnu_max, gnu_base_base_max, 0))
1846 || ! CONTAINS_PLACEHOLDER_P (gnu_max))
1847 gnu_base_max = gnu_max;
1849 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
1850 && TREE_CONSTANT_OVERFLOW (gnu_base_min))
1851 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
1852 || (TREE_CODE (gnu_base_max) == INTEGER_CST
1853 && TREE_CONSTANT_OVERFLOW (gnu_base_max))
1854 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
1857 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
1858 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
1861 = size_binop (MAX_EXPR,
1862 size_binop (PLUS_EXPR, size_one_node,
1863 size_binop (MINUS_EXPR, gnu_base_max,
1867 if (TREE_CODE (gnu_this_max) == INTEGER_CST
1868 && TREE_CONSTANT_OVERFLOW (gnu_this_max))
1872 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
1874 if (! integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
1875 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
1877 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
1878 || (TREE_TYPE (gnu_index_subtype) != 0
1879 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
1881 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
1882 || (TYPE_PRECISION (gnu_index_subtype)
1883 > TYPE_PRECISION (sizetype)))
1884 need_index_type_struct = 1;
1887 /* Then flatten: create the array of arrays. */
1889 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
1891 /* One of the above calls might have caused us to be elaborated,
1892 so don't blow up if so. */
1893 if (present_gnu_tree (gnat_entity))
1899 /* Get and validate any specified Component_Size, but if Packed,
1900 ignore it since the front end will have taken care of it. */
1902 = validate_size (Component_Size (gnat_entity), gnu_type,
1904 (Is_Bit_Packed_Array (gnat_entity)
1905 ? TYPE_DECL : VAR_DECL),
1906 1, Has_Component_Size_Clause (gnat_entity));
1908 /* If the component type is a RECORD_TYPE that has a self-referential
1909 size, use the maxium size. */
1910 if (gnu_comp_size == 0 && TREE_CODE (gnu_type) == RECORD_TYPE
1911 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
1912 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), 1);
1914 if (! Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size != 0)
1916 gnu_type = make_type_from_size (gnu_type, gnu_comp_size, 0);
1917 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
1918 gnat_entity, "C_PAD", 0,
1922 if (Has_Volatile_Components (Base_Type (gnat_entity)))
1923 gnu_type = build_qualified_type (gnu_type,
1924 (TYPE_QUALS (gnu_type)
1925 | TYPE_QUAL_VOLATILE));
1927 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
1928 TYPE_SIZE_UNIT (gnu_type));
1929 gnu_max_size = size_binop (MULT_EXPR,
1930 convert (bitsizetype, gnu_max_size),
1931 TYPE_SIZE (gnu_type));
1933 for (index = array_dim - 1; index >= 0; index --)
1935 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
1936 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
1937 /* If the type below this an multi-array type, then this
1938 does not not have aliased components.
1940 ??? Otherwise, for now, we say that any component of aggregate
1941 type is addressable because the front end may take 'Reference
1942 of it. But we have to make it addressable if it must be passed
1943 by reference or it that is the default. */
1944 TYPE_NONALIASED_COMPONENT (gnu_type)
1945 = ((TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
1946 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) ? 1
1947 : (! Has_Aliased_Components (gnat_entity)
1948 && ! AGGREGATE_TYPE_P (TREE_TYPE (gnu_type))));
1951 /* If we are at file level and this is a multi-dimensional array, we
1952 need to make a variable corresponding to the stride of the
1953 inner dimensions. */
1954 if (global_bindings_p () && array_dim > 1)
1956 tree gnu_str_name = get_identifier ("ST");
1959 for (gnu_arr_type = TREE_TYPE (gnu_type);
1960 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
1961 gnu_arr_type = TREE_TYPE (gnu_arr_type),
1962 gnu_str_name = concat_id_with_name (gnu_str_name, "ST"))
1964 tree eltype = TREE_TYPE (gnu_arr_type);
1966 TYPE_SIZE (gnu_arr_type)
1967 = elaborate_expression_1 (gnat_entity, gnat_entity,
1968 TYPE_SIZE (gnu_arr_type),
1969 gnu_str_name, definition, 0);
1971 /* ??? For now, store the size as a multiple of the
1972 alignment of the element type in bytes so that we
1973 can see the alignment from the tree. */
1974 TYPE_SIZE_UNIT (gnu_arr_type)
1976 (MULT_EXPR, sizetype,
1977 elaborate_expression_1
1978 (gnat_entity, gnat_entity,
1979 build_binary_op (EXACT_DIV_EXPR, sizetype,
1980 TYPE_SIZE_UNIT (gnu_arr_type),
1981 size_int (TYPE_ALIGN (eltype)
1983 concat_id_with_name (gnu_str_name, "A_U"),
1985 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
1989 /* If we need to write out a record type giving the names of
1990 the bounds, do it now. */
1991 if (need_index_type_struct && debug_info_p)
1993 tree gnu_bound_rec_type = make_node (RECORD_TYPE);
1994 tree gnu_field_list = 0;
1997 TYPE_NAME (gnu_bound_rec_type)
1998 = create_concat_name (gnat_entity, "XA");
2000 for (index = array_dim - 1; index >= 0; index--)
2003 = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type[index]));
2005 if (TREE_CODE (gnu_type_name) == TYPE_DECL)
2006 gnu_type_name = DECL_NAME (gnu_type_name);
2008 gnu_field = create_field_decl (gnu_type_name,
2011 0, NULL_TREE, NULL_TREE, 0);
2012 TREE_CHAIN (gnu_field) = gnu_field_list;
2013 gnu_field_list = gnu_field;
2016 finish_record_type (gnu_bound_rec_type, gnu_field_list, 0, 0);
2019 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2020 = (Convention (gnat_entity) == Convention_Fortran);
2021 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2022 = Is_Packed_Array_Type (gnat_entity);
2024 /* If our size depends on a placeholder and the maximum size doesn't
2025 overflow, use it. */
2026 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2027 && ! (TREE_CODE (gnu_max_size) == INTEGER_CST
2028 && TREE_OVERFLOW (gnu_max_size))
2029 && ! (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2030 && TREE_OVERFLOW (gnu_max_size_unit))
2033 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2034 TYPE_SIZE (gnu_type));
2035 TYPE_SIZE_UNIT (gnu_type)
2036 = size_binop (MIN_EXPR, gnu_max_size_unit,
2037 TYPE_SIZE_UNIT (gnu_type));
2040 /* Set our alias set to that of our base type. This gives all
2041 array subtypes the same alias set. */
2042 copy_alias_set (gnu_type, gnu_base_type);
2045 /* If this is a packed type, make this type the same as the packed
2046 array type, but do some adjusting in the type first. */
2048 if (Present (Packed_Array_Type (gnat_entity)))
2050 Entity_Id gnat_index;
2051 tree gnu_inner_type;
2053 /* First finish the type we had been making so that we output
2054 debugging information for it */
2056 = build_qualified_type (gnu_type,
2057 (TYPE_QUALS (gnu_type)
2058 | (TYPE_QUAL_VOLATILE
2059 * Treat_As_Volatile (gnat_entity))));
2060 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2061 ! Comes_From_Source (gnat_entity),
2063 annotate_decl_with_node (gnu_decl, gnat_entity);
2064 if (! Comes_From_Source (gnat_entity))
2065 DECL_ARTIFICIAL (gnu_decl) = 1;
2067 /* Save it as our equivalent in case the call below elaborates
2069 save_gnu_tree (gnat_entity, gnu_decl, 0);
2071 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2074 gnu_inner_type = gnu_type = TREE_TYPE (gnu_decl);
2075 save_gnu_tree (gnat_entity, NULL_TREE, 0);
2077 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2078 && (TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_inner_type)
2079 || TYPE_IS_PADDING_P (gnu_inner_type)))
2080 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2082 /* We need to point the type we just made to our index type so
2083 the actual bounds can be put into a template. */
2085 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2086 && TYPE_ACTUAL_BOUNDS (gnu_inner_type) == 0)
2087 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2088 && ! TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2090 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2092 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2093 If it is, we need to make another type. */
2094 if (TYPE_MODULAR_P (gnu_inner_type))
2098 gnu_subtype = make_node (INTEGER_TYPE);
2100 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2101 TYPE_MIN_VALUE (gnu_subtype)
2102 = TYPE_MIN_VALUE (gnu_inner_type);
2103 TYPE_MAX_VALUE (gnu_subtype)
2104 = TYPE_MAX_VALUE (gnu_inner_type);
2105 TYPE_PRECISION (gnu_subtype)
2106 = TYPE_PRECISION (gnu_inner_type);
2107 TYPE_UNSIGNED (gnu_subtype)
2108 = TYPE_UNSIGNED (gnu_inner_type);
2109 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2110 layout_type (gnu_subtype);
2112 gnu_inner_type = gnu_subtype;
2115 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2118 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2120 for (gnat_index = First_Index (gnat_entity);
2121 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2122 SET_TYPE_ACTUAL_BOUNDS
2124 tree_cons (NULL_TREE,
2125 get_unpadded_type (Etype (gnat_index)),
2126 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2128 if (Convention (gnat_entity) != Convention_Fortran)
2129 SET_TYPE_ACTUAL_BOUNDS
2131 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2133 if (TREE_CODE (gnu_type) == RECORD_TYPE
2134 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type))
2135 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2139 /* Abort if packed array with no packed array type field set. */
2140 else if (Is_Packed (gnat_entity))
2145 case E_String_Literal_Subtype:
2146 /* Create the type for a string literal. */
2148 Entity_Id gnat_full_type
2149 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2150 && Present (Full_View (Etype (gnat_entity)))
2151 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2152 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2153 tree gnu_string_array_type
2154 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2155 tree gnu_string_index_type
2156 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2157 (TYPE_DOMAIN (gnu_string_array_type))));
2158 tree gnu_lower_bound
2159 = convert (gnu_string_index_type,
2160 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2161 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2162 tree gnu_length = ssize_int (length - 1);
2163 tree gnu_upper_bound
2164 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2166 convert (gnu_string_index_type, gnu_length));
2168 = build_range_type (gnu_string_index_type,
2169 gnu_lower_bound, gnu_upper_bound);
2171 = create_index_type (convert (sizetype,
2172 TYPE_MIN_VALUE (gnu_range_type)),
2174 TYPE_MAX_VALUE (gnu_range_type)),
2178 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2183 /* Record Types and Subtypes
2185 The following fields are defined on record types:
2187 Has_Discriminants True if the record has discriminants
2188 First_Discriminant Points to head of list of discriminants
2189 First_Entity Points to head of list of fields
2190 Is_Tagged_Type True if the record is tagged
2192 Implementation of Ada records and discriminated records:
2194 A record type definition is transformed into the equivalent of a C
2195 struct definition. The fields that are the discriminants which are
2196 found in the Full_Type_Declaration node and the elements of the
2197 Component_List found in the Record_Type_Definition node. The
2198 Component_List can be a recursive structure since each Variant of
2199 the Variant_Part of the Component_List has a Component_List.
2201 Processing of a record type definition comprises starting the list of
2202 field declarations here from the discriminants and the calling the
2203 function components_to_record to add the rest of the fields from the
2204 component list and return the gnu type node. The function
2205 components_to_record will call itself recursively as it traverses
2209 if (Has_Complex_Representation (gnat_entity))
2212 = build_complex_type
2214 (Etype (Defining_Entity
2215 (First (Component_Items
2218 (Declaration_Node (gnat_entity)))))))));
2224 Node_Id full_definition = Declaration_Node (gnat_entity);
2225 Node_Id record_definition = Type_Definition (full_definition);
2226 Entity_Id gnat_field;
2228 tree gnu_field_list = NULL_TREE;
2229 tree gnu_get_parent;
2230 int packed = (Is_Packed (gnat_entity) ? 1
2231 : (Component_Alignment (gnat_entity)
2232 == Calign_Storage_Unit) ? -1
2234 int has_rep = Has_Specified_Layout (gnat_entity);
2235 int all_rep = has_rep;
2237 = (Is_Tagged_Type (gnat_entity)
2238 && Nkind (record_definition) == N_Derived_Type_Definition);
2240 /* See if all fields have a rep clause. Stop when we find one
2242 for (gnat_field = First_Entity (gnat_entity);
2243 Present (gnat_field) && all_rep;
2244 gnat_field = Next_Entity (gnat_field))
2245 if ((Ekind (gnat_field) == E_Component
2246 || Ekind (gnat_field) == E_Discriminant)
2247 && No (Component_Clause (gnat_field)))
2250 /* If this is a record extension, go a level further to find the
2251 record definition. Also, verify we have a Parent_Subtype. */
2254 if (! type_annotate_only
2255 || Present (Record_Extension_Part (record_definition)))
2256 record_definition = Record_Extension_Part (record_definition);
2258 if (! type_annotate_only && No (Parent_Subtype (gnat_entity)))
2262 /* Make a node for the record. If we are not defining the record,
2263 suppress expanding incomplete types and save the node as the type
2264 for GNAT_ENTITY. We use the same RECORD_TYPE as for a dummy type
2265 and reset TYPE_DUMMY_P to show it's no longer a dummy.
2267 It is very tempting to delay resetting this bit until we are done
2268 with completing the type, e.g. to let possible intermediate
2269 elaboration of access types designating the record know it is not
2270 complete and arrange for update_pointer_to to fix things up later.
2272 It would be wrong, however, because dummy types are expected only
2273 to be created for Ada incomplete or private types, which is not
2274 what we have here. Doing so would make other parts of gigi think
2275 we are dealing with a really incomplete or private type, and have
2276 nasty side effects, typically on the generation of the associated
2277 debugging information. */
2278 gnu_type = make_dummy_type (gnat_entity);
2279 TYPE_DUMMY_P (gnu_type) = 0;
2281 if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL && debug_info_p)
2282 DECL_IGNORED_P (TYPE_NAME (gnu_type)) = 0;
2284 TYPE_ALIGN (gnu_type) = 0;
2285 TYPE_PACKED (gnu_type) = packed != 0 || has_rep;
2289 defer_incomplete_level++;
2291 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2292 ! Comes_From_Source (gnat_entity),
2294 annotate_decl_with_node (gnu_decl, gnat_entity);
2295 save_gnu_tree (gnat_entity, gnu_decl, 0);
2296 this_made_decl = saved = 1;
2299 /* If both a size and rep clause was specified, put the size in
2300 the record type now so that it can get the proper mode. */
2301 if (has_rep && Known_Esize (gnat_entity))
2302 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2304 /* Always set the alignment here so that it can be used to
2305 set the mode, if it is making the alignment stricter. If
2306 it is invalid, it will be checked again below. If this is to
2307 be Atomic, choose a default alignment of a word unless we know
2308 the size and it's smaller. */
2309 if (Known_Alignment (gnat_entity))
2310 TYPE_ALIGN (gnu_type)
2311 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2312 else if (Is_Atomic (gnat_entity))
2313 TYPE_ALIGN (gnu_type)
2314 = (esize >= BITS_PER_WORD ? BITS_PER_WORD
2315 : 1 << ((floor_log2 (esize) - 1) + 1));
2317 /* If we have a Parent_Subtype, make a field for the parent. If
2318 this record has rep clauses, force the position to zero. */
2319 if (Present (Parent_Subtype (gnat_entity)))
2323 /* A major complexity here is that the parent subtype will
2324 reference our discriminants. But those must reference
2325 the parent component of this record. So here we will
2326 initialize each of those components to a COMPONENT_REF.
2327 The first operand of that COMPONENT_REF is another
2328 COMPONENT_REF which will be filled in below, once
2329 the parent type can be safely built. */
2331 gnu_get_parent = build (COMPONENT_REF, void_type_node,
2332 build (PLACEHOLDER_EXPR, gnu_type),
2333 build_decl (FIELD_DECL, NULL_TREE,
2336 if (Has_Discriminants (gnat_entity))
2337 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2338 Present (gnat_field);
2339 gnat_field = Next_Stored_Discriminant (gnat_field))
2340 if (Present (Corresponding_Discriminant (gnat_field)))
2343 build (COMPONENT_REF,
2344 get_unpadded_type (Etype (gnat_field)),
2346 gnat_to_gnu_entity (Corresponding_Discriminant
2351 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_entity));
2354 = create_field_decl (get_identifier
2355 (Get_Name_String (Name_uParent)),
2356 gnu_parent, gnu_type, 0,
2357 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2358 has_rep ? bitsize_zero_node : 0, 1);
2359 DECL_INTERNAL_P (gnu_field_list) = 1;
2361 TREE_TYPE (gnu_get_parent) = gnu_parent;
2362 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2365 /* Add the fields for the discriminants into the record. */
2366 if (! Is_Unchecked_Union (gnat_entity)
2367 && Has_Discriminants (gnat_entity))
2368 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2369 Present (gnat_field);
2370 gnat_field = Next_Stored_Discriminant (gnat_field))
2372 /* If this is a record extension and this discriminant
2373 is the renaming of another discriminant, we've already
2374 handled the discriminant above. */
2375 if (Present (Parent_Subtype (gnat_entity))
2376 && Present (Corresponding_Discriminant (gnat_field)))
2380 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2382 /* Make an expression using a PLACEHOLDER_EXPR from the
2383 FIELD_DECL node just created and link that with the
2384 corresponding GNAT defining identifier. Then add to the
2386 save_gnu_tree (gnat_field,
2387 build (COMPONENT_REF, TREE_TYPE (gnu_field),
2388 build (PLACEHOLDER_EXPR,
2389 DECL_CONTEXT (gnu_field)),
2393 TREE_CHAIN (gnu_field) = gnu_field_list;
2394 gnu_field_list = gnu_field;
2397 /* Put the discriminants into the record (backwards), so we can
2398 know the appropriate discriminant to use for the names of the
2400 TYPE_FIELDS (gnu_type) = gnu_field_list;
2402 /* Add the listed fields into the record and finish up. */
2403 components_to_record (gnu_type, Component_List (record_definition),
2404 gnu_field_list, packed, definition, 0,
2407 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2408 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2410 /* If this is an extension type, reset the tree for any
2411 inherited discriminants. Also remove the PLACEHOLDER_EXPR
2412 for non-inherited discriminants. */
2413 if (! Is_Unchecked_Union (gnat_entity)
2414 && Has_Discriminants (gnat_entity))
2415 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2416 Present (gnat_field);
2417 gnat_field = Next_Stored_Discriminant (gnat_field))
2419 if (Present (Parent_Subtype (gnat_entity))
2420 && Present (Corresponding_Discriminant (gnat_field)))
2421 save_gnu_tree (gnat_field, NULL_TREE, 0);
2424 gnu_field = get_gnu_tree (gnat_field);
2425 save_gnu_tree (gnat_field, NULL_TREE, 0);
2426 save_gnu_tree (gnat_field, TREE_OPERAND (gnu_field, 1), 0);
2430 /* If it is a tagged record force the type to BLKmode to insure
2431 that these objects will always be placed in memory. Do the
2432 same thing for limited record types. */
2433 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2434 TYPE_MODE (gnu_type) = BLKmode;
2436 /* If this is a derived type, we must make the alias set of this type
2437 the same as that of the type we are derived from. We assume here
2438 that the other type is already frozen. */
2439 if (Etype (gnat_entity) != gnat_entity
2440 && ! (Is_Private_Type (Etype (gnat_entity))
2441 && Full_View (Etype (gnat_entity)) == gnat_entity))
2442 copy_alias_set (gnu_type, gnat_to_gnu_type (Etype (gnat_entity)));
2444 /* Fill in locations of fields. */
2445 annotate_rep (gnat_entity, gnu_type);
2447 /* If there are any entities in the chain corresponding to
2448 components that we did not elaborate, ensure we elaborate their
2449 types if they are Itypes. */
2450 for (gnat_temp = First_Entity (gnat_entity);
2451 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2452 if ((Ekind (gnat_temp) == E_Component
2453 || Ekind (gnat_temp) == E_Discriminant)
2454 && Is_Itype (Etype (gnat_temp))
2455 && ! present_gnu_tree (gnat_temp))
2456 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2460 case E_Class_Wide_Subtype:
2461 /* If an equivalent type is present, that is what we should use.
2462 Otherwise, fall through to handle this like a record subtype
2463 since it may have constraints. */
2465 if (Present (Equivalent_Type (gnat_entity)))
2467 gnu_decl = gnat_to_gnu_entity (Equivalent_Type (gnat_entity),
2473 /* ... fall through ... */
2475 case E_Record_Subtype:
2477 /* If Cloned_Subtype is Present it means this record subtype has
2478 identical layout to that type or subtype and we should use
2479 that GCC type for this one. The front end guarantees that
2480 the component list is shared. */
2481 if (Present (Cloned_Subtype (gnat_entity)))
2483 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2488 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2489 changing the type, make a new type with each field having the
2490 type of the field in the new subtype but having the position
2491 computed by transforming every discriminant reference according
2492 to the constraints. We don't see any difference between
2493 private and nonprivate type here since derivations from types should
2494 have been deferred until the completion of the private type. */
2497 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2502 defer_incomplete_level++, this_deferred = 1;
2504 /* Get the base type initially for its alignment and sizes. But
2505 if it is a padded type, we do all the other work with the
2507 gnu_type = gnu_orig_type = gnu_base_type
2508 = gnat_to_gnu_type (gnat_base_type);
2510 if (TREE_CODE (gnu_type) == RECORD_TYPE
2511 && TYPE_IS_PADDING_P (gnu_type))
2512 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
2514 if (present_gnu_tree (gnat_entity))
2520 /* When the type has discriminants, and these discriminants
2521 affect the shape of what it built, factor them in.
2523 If we are making a subtype of an Unchecked_Union (must be an
2524 Itype), just return the type.
2526 We can't just use Is_Constrained because private subtypes without
2527 discriminants of full types with discriminants with default
2528 expressions are Is_Constrained but aren't constrained! */
2530 if (IN (Ekind (gnat_base_type), Record_Kind)
2531 && ! Is_For_Access_Subtype (gnat_entity)
2532 && ! Is_Unchecked_Union (gnat_base_type)
2533 && Is_Constrained (gnat_entity)
2534 && Stored_Constraint (gnat_entity) != No_Elist
2535 && Present (Discriminant_Constraint (gnat_entity)))
2537 Entity_Id gnat_field;
2538 Entity_Id gnat_root_type;
2539 tree gnu_field_list = 0;
2541 = compute_field_positions (gnu_orig_type, NULL_TREE,
2542 size_zero_node, bitsize_zero_node,
2545 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
2549 /* If this is a derived type, we may be seeing fields from any
2550 original records, so add those positions and discriminant
2551 substitutions to our lists. */
2552 for (gnat_root_type = gnat_base_type;
2553 Underlying_Type (Etype (gnat_root_type)) != gnat_root_type;
2554 gnat_root_type = Underlying_Type (Etype (gnat_root_type)))
2557 = compute_field_positions
2558 (gnat_to_gnu_type (Etype (gnat_root_type)),
2559 gnu_pos_list, size_zero_node, bitsize_zero_node,
2562 if (Present (Parent_Subtype (gnat_root_type)))
2564 = substitution_list (Parent_Subtype (gnat_root_type),
2565 Empty, gnu_subst_list, definition);
2568 gnu_type = make_node (RECORD_TYPE);
2569 TYPE_NAME (gnu_type) = gnu_entity_id;
2570 TYPE_STUB_DECL (gnu_type)
2571 = pushdecl (build_decl (TYPE_DECL, NULL_TREE, gnu_type));
2572 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2574 for (gnat_field = First_Entity (gnat_entity);
2575 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
2576 if (Ekind (gnat_field) == E_Component
2577 || Ekind (gnat_field) == E_Discriminant)
2580 = gnat_to_gnu_entity
2581 (Original_Record_Component (gnat_field), NULL_TREE, 0);
2583 = TREE_VALUE (purpose_member (gnu_old_field,
2585 tree gnu_pos = TREE_PURPOSE (gnu_offset);
2586 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
2588 = gnat_to_gnu_type (Etype (gnat_field));
2589 tree gnu_size = TYPE_SIZE (gnu_field_type);
2590 tree gnu_new_pos = 0;
2591 unsigned int offset_align
2592 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
2596 /* If there was a component clause, the field types must be
2597 the same for the type and subtype, so copy the data from
2598 the old field to avoid recomputation here. */
2599 if (Present (Component_Clause
2600 (Original_Record_Component (gnat_field))))
2602 gnu_size = DECL_SIZE (gnu_old_field);
2603 gnu_field_type = TREE_TYPE (gnu_old_field);
2606 /* If this was a bitfield, get the size from the old field.
2607 Also ensure the type can be placed into a bitfield. */
2608 else if (DECL_BIT_FIELD (gnu_old_field))
2610 gnu_size = DECL_SIZE (gnu_old_field);
2611 if (TYPE_MODE (gnu_field_type) == BLKmode
2612 && TREE_CODE (gnu_field_type) == RECORD_TYPE
2613 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
2614 gnu_field_type = make_packable_type (gnu_field_type);
2617 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
2618 for (gnu_temp = gnu_subst_list;
2619 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2620 gnu_pos = substitute_in_expr (gnu_pos,
2621 TREE_PURPOSE (gnu_temp),
2622 TREE_VALUE (gnu_temp));
2624 /* If the size is now a constant, we can set it as the
2625 size of the field when we make it. Otherwise, we need
2626 to deal with it specially. */
2627 if (TREE_CONSTANT (gnu_pos))
2628 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
2632 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
2633 0, gnu_size, gnu_new_pos,
2634 ! DECL_NONADDRESSABLE_P (gnu_old_field));
2636 if (! TREE_CONSTANT (gnu_pos))
2638 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
2639 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
2640 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
2641 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
2642 DECL_SIZE (gnu_field) = gnu_size;
2643 DECL_SIZE_UNIT (gnu_field)
2644 = convert (sizetype,
2645 size_binop (CEIL_DIV_EXPR, gnu_size,
2646 bitsize_unit_node));
2647 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
2650 DECL_INTERNAL_P (gnu_field)
2651 = DECL_INTERNAL_P (gnu_old_field);
2652 SET_DECL_ORIGINAL_FIELD
2653 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field) != 0
2654 ? DECL_ORIGINAL_FIELD (gnu_old_field)
2656 DECL_DISCRIMINANT_NUMBER (gnu_field)
2657 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
2658 TREE_THIS_VOLATILE (gnu_field)
2659 = TREE_THIS_VOLATILE (gnu_old_field);
2660 TREE_CHAIN (gnu_field) = gnu_field_list;
2661 gnu_field_list = gnu_field;
2662 save_gnu_tree (gnat_field, gnu_field, 0);
2665 finish_record_type (gnu_type, nreverse (gnu_field_list), 1, 0);
2667 /* Now set the size, alignment and alias set of the new type to
2668 match that of the old one, doing any substitutions, as
2670 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2671 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
2672 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
2673 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
2674 copy_alias_set (gnu_type, gnu_base_type);
2676 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2677 for (gnu_temp = gnu_subst_list;
2678 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2679 TYPE_SIZE (gnu_type)
2680 = substitute_in_expr (TYPE_SIZE (gnu_type),
2681 TREE_PURPOSE (gnu_temp),
2682 TREE_VALUE (gnu_temp));
2684 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
2685 for (gnu_temp = gnu_subst_list;
2686 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2687 TYPE_SIZE_UNIT (gnu_type)
2688 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
2689 TREE_PURPOSE (gnu_temp),
2690 TREE_VALUE (gnu_temp));
2692 if (TYPE_ADA_SIZE (gnu_type) != 0
2693 && CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
2694 for (gnu_temp = gnu_subst_list;
2695 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2697 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
2698 TREE_PURPOSE (gnu_temp),
2699 TREE_VALUE (gnu_temp)));
2701 /* Recompute the mode of this record type now that we know its
2703 compute_record_mode (gnu_type);
2705 /* Fill in locations of fields. */
2706 annotate_rep (gnat_entity, gnu_type);
2709 /* If we've made a new type, record it and make an XVS type to show
2710 what this is a subtype of. Some debuggers require the XVS
2711 type to be output first, so do it in that order. */
2712 if (gnu_type != gnu_orig_type)
2716 tree gnu_subtype_marker = make_node (RECORD_TYPE);
2717 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
2719 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
2720 gnu_orig_name = DECL_NAME (gnu_orig_name);
2722 TYPE_NAME (gnu_subtype_marker)
2723 = create_concat_name (gnat_entity, "XVS");
2724 finish_record_type (gnu_subtype_marker,
2725 create_field_decl (gnu_orig_name,
2733 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2734 TYPE_NAME (gnu_type) = gnu_entity_id;
2735 TYPE_STUB_DECL (gnu_type)
2736 = pushdecl (build_decl (TYPE_DECL, TYPE_NAME (gnu_type),
2738 DECL_ARTIFICIAL (TYPE_STUB_DECL (gnu_type)) = 1;
2739 DECL_IGNORED_P (TYPE_STUB_DECL (gnu_type)) = ! debug_info_p;
2740 rest_of_type_compilation (gnu_type, global_bindings_p ());
2743 /* Otherwise, go down all the components in the new type and
2744 make them equivalent to those in the base type. */
2746 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
2747 gnat_temp = Next_Entity (gnat_temp))
2748 if ((Ekind (gnat_temp) == E_Discriminant
2749 && ! Is_Unchecked_Union (gnat_base_type))
2750 || Ekind (gnat_temp) == E_Component)
2751 save_gnu_tree (gnat_temp,
2753 (Original_Record_Component (gnat_temp)), 0);
2757 case E_Access_Subprogram_Type:
2758 case E_Anonymous_Access_Subprogram_Type:
2759 /* If we are not defining this entity, and we have incomplete
2760 entities being processed above us, make a dummy type and
2761 fill it in later. */
2762 if (! definition && defer_incomplete_level != 0)
2764 struct incomplete *p
2765 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
2768 = build_pointer_type
2769 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
2770 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2771 ! Comes_From_Source (gnat_entity),
2773 save_gnu_tree (gnat_entity, gnu_decl, 0);
2774 this_made_decl = saved = 1;
2776 p->old_type = TREE_TYPE (gnu_type);
2777 p->full_type = Directly_Designated_Type (gnat_entity);
2778 p->next = defer_incomplete_list;
2779 defer_incomplete_list = p;
2783 /* ... fall through ... */
2785 case E_Allocator_Type:
2787 case E_Access_Attribute_Type:
2788 case E_Anonymous_Access_Type:
2789 case E_General_Access_Type:
2791 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
2792 Entity_Id gnat_desig_full
2793 = ((IN (Ekind (Etype (gnat_desig_type)),
2794 Incomplete_Or_Private_Kind))
2795 ? Full_View (gnat_desig_type) : 0);
2796 /* We want to know if we'll be seeing the freeze node for any
2797 incomplete type we may be pointing to. */
2799 = (Present (gnat_desig_full)
2800 ? In_Extended_Main_Code_Unit (gnat_desig_full)
2801 : In_Extended_Main_Code_Unit (gnat_desig_type));
2804 tree gnu_desig_type = 0;
2805 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
2807 if (!targetm.valid_pointer_mode (p_mode))
2810 if (No (gnat_desig_full)
2811 && (Ekind (gnat_desig_type) == E_Class_Wide_Type
2812 || (Ekind (gnat_desig_type) == E_Class_Wide_Subtype
2813 && Present (Equivalent_Type (gnat_desig_type)))))
2815 if (Present (Equivalent_Type (gnat_desig_type)))
2817 gnat_desig_full = Equivalent_Type (gnat_desig_type);
2818 if (IN (Ekind (gnat_desig_full), Incomplete_Or_Private_Kind))
2819 gnat_desig_full = Full_View (gnat_desig_full);
2821 else if (IN (Ekind (Root_Type (gnat_desig_type)),
2822 Incomplete_Or_Private_Kind))
2823 gnat_desig_full = Full_View (Root_Type (gnat_desig_type));
2826 if (Present (gnat_desig_full) && Is_Concurrent_Type (gnat_desig_full))
2827 gnat_desig_full = Corresponding_Record_Type (gnat_desig_full);
2829 /* If either the designated type or its full view is an
2830 unconstrained array subtype, replace it with the type it's a
2831 subtype of. This avoids problems with multiple copies of
2832 unconstrained array types. */
2833 if (Ekind (gnat_desig_type) == E_Array_Subtype
2834 && ! Is_Constrained (gnat_desig_type))
2835 gnat_desig_type = Etype (gnat_desig_type);
2836 if (Present (gnat_desig_full)
2837 && Ekind (gnat_desig_full) == E_Array_Subtype
2838 && ! Is_Constrained (gnat_desig_full))
2839 gnat_desig_full = Etype (gnat_desig_full);
2841 /* If the designated type is a subtype of an incomplete record type,
2842 use the parent type to avoid order of elaboration issues. This
2843 can lose some code efficiency, but there is no alternative. */
2844 if (Present (gnat_desig_full)
2845 && Ekind (gnat_desig_full) == E_Record_Subtype
2846 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)
2847 gnat_desig_full = Etype (gnat_desig_full);
2849 /* If we are pointing to an incomplete type whose completion is an
2850 unconstrained array, make a fat pointer type instead of a pointer
2851 to VOID. The two types in our fields will be pointers to VOID and
2852 will be replaced in update_pointer_to. Similiarly, if the type
2853 itself is a dummy type or an unconstrained array. Also make
2854 a dummy TYPE_OBJECT_RECORD_TYPE in case we have any thin
2857 if ((Present (gnat_desig_full)
2858 && Is_Array_Type (gnat_desig_full)
2859 && ! Is_Constrained (gnat_desig_full))
2860 || (present_gnu_tree (gnat_desig_type)
2861 && TYPE_IS_DUMMY_P (TREE_TYPE
2862 (get_gnu_tree (gnat_desig_type)))
2863 && Is_Array_Type (gnat_desig_type)
2864 && ! Is_Constrained (gnat_desig_type))
2865 || (present_gnu_tree (gnat_desig_type)
2866 && (TREE_CODE (TREE_TYPE (get_gnu_tree (gnat_desig_type)))
2867 == UNCONSTRAINED_ARRAY_TYPE)
2868 && (TYPE_POINTER_TO (TREE_TYPE
2869 (get_gnu_tree (gnat_desig_type)))
2871 || (No (gnat_desig_full) && ! in_main_unit
2872 && defer_incomplete_level != 0
2873 && ! present_gnu_tree (gnat_desig_type)
2874 && Is_Array_Type (gnat_desig_type)
2875 && ! Is_Constrained (gnat_desig_type)))
2878 = (present_gnu_tree (gnat_desig_type)
2879 ? gnat_to_gnu_type (gnat_desig_type)
2880 : make_dummy_type (gnat_desig_type));
2883 /* Show the dummy we get will be a fat pointer. */
2884 got_fat_p = made_dummy = 1;
2886 /* If the call above got something that has a pointer, that
2887 pointer is our type. This could have happened either
2888 because the type was elaborated or because somebody
2889 else executed the code below. */
2890 gnu_type = TYPE_POINTER_TO (gnu_old);
2893 gnu_type = make_node (RECORD_TYPE);
2894 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
2895 TYPE_POINTER_TO (gnu_old) = gnu_type;
2897 Sloc_to_locus (Sloc (gnat_entity), &input_location);
2899 = chainon (chainon (NULL_TREE,
2901 (get_identifier ("P_ARRAY"),
2902 ptr_void_type_node, gnu_type,
2904 create_field_decl (get_identifier ("P_BOUNDS"),
2906 gnu_type, 0, 0, 0, 0));
2908 /* Make sure we can place this into a register. */
2909 TYPE_ALIGN (gnu_type)
2910 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
2911 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
2912 finish_record_type (gnu_type, fields, 0, 1);
2914 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
2915 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
2916 = concat_id_with_name (get_entity_name (gnat_desig_type),
2918 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
2922 /* If we already know what the full type is, use it. */
2923 else if (Present (gnat_desig_full)
2924 && present_gnu_tree (gnat_desig_full))
2925 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
2927 /* Get the type of the thing we are to point to and build a pointer
2928 to it. If it is a reference to an incomplete or private type with a
2929 full view that is a record, make a dummy type node and get the
2930 actual type later when we have verified it is safe. */
2931 else if (! in_main_unit
2932 && ! present_gnu_tree (gnat_desig_type)
2933 && Present (gnat_desig_full)
2934 && ! present_gnu_tree (gnat_desig_full)
2935 && Is_Record_Type (gnat_desig_full))
2937 gnu_desig_type = make_dummy_type (gnat_desig_type);
2941 /* Likewise if we are pointing to a record or array and we are to defer
2942 elaborating incomplete types. We do this since this access type
2943 may be the full view of some private type. Note that the
2944 unconstrained array case is handled above. */
2945 else if ((! in_main_unit || imported_p) && defer_incomplete_level != 0
2946 && ! present_gnu_tree (gnat_desig_type)
2947 && ((Is_Record_Type (gnat_desig_type)
2948 || Is_Array_Type (gnat_desig_type))
2949 || (Present (gnat_desig_full)
2950 && (Is_Record_Type (gnat_desig_full)
2951 || Is_Array_Type (gnat_desig_full)))))
2953 gnu_desig_type = make_dummy_type (gnat_desig_type);
2956 else if (gnat_desig_type == gnat_entity)
2959 = build_pointer_type_for_mode (make_node (VOID_TYPE),
2961 No_Strict_Aliasing (gnat_entity));
2962 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
2965 gnu_desig_type = gnat_to_gnu_type (gnat_desig_type);
2967 /* It is possible that the above call to gnat_to_gnu_type resolved our
2968 type. If so, just return it. */
2969 if (present_gnu_tree (gnat_entity))
2975 /* If we have a GCC type for the designated type, possibly modify it
2976 if we are pointing only to constant objects and then make a pointer
2977 to it. Don't do this for unconstrained arrays. */
2978 if (gnu_type == 0 && gnu_desig_type != 0)
2980 if (Is_Access_Constant (gnat_entity)
2981 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
2984 = build_qualified_type
2986 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
2988 /* Some extra processing is required if we are building a
2989 pointer to an incomplete type (in the GCC sense). We might
2990 have such a type if we just made a dummy, or directly out
2991 of the call to gnat_to_gnu_type above if we are processing
2992 an access type for a record component designating the
2993 record type itself. */
2994 if (! COMPLETE_TYPE_P (gnu_desig_type))
2996 /* We must ensure that the pointer to variant we make will
2997 be processed by update_pointer_to when the initial type
2998 is completed. Pretend we made a dummy and let further
2999 processing act as usual. */
3002 /* We must ensure that update_pointer_to will not retrieve
3003 the dummy variant when building a properly qualified
3004 version of the complete type. We take advantage of the
3005 fact that get_qualified_type is requiring TYPE_NAMEs to
3006 match to influence build_qualified_type and then also
3007 update_pointer_to here. */
3008 TYPE_NAME (gnu_desig_type)
3009 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3014 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3015 No_Strict_Aliasing (gnat_entity));
3018 /* If we are not defining this object and we made a dummy pointer,
3019 save our current definition, evaluate the actual type, and replace
3020 the tentative type we made with the actual one. If we are to defer
3021 actually looking up the actual type, make an entry in the
3024 if (! in_main_unit && made_dummy)
3027 = TYPE_FAT_POINTER_P (gnu_type)
3028 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3030 if (esize == POINTER_SIZE
3031 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3033 = build_pointer_type
3034 (TYPE_OBJECT_RECORD_TYPE
3035 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3037 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3038 ! Comes_From_Source (gnat_entity),
3040 save_gnu_tree (gnat_entity, gnu_decl, 0);
3041 this_made_decl = saved = 1;
3043 if (defer_incomplete_level == 0)
3045 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3046 gnat_to_gnu_type (gnat_desig_type));
3047 /* Note that the call to gnat_to_gnu_type here might have
3048 updated gnu_old_type directly, in which case it is not a
3049 dummy type any more when we get into update_pointer_to.
3051 This may happen for instance when the designated type is a
3052 record type, because their elaboration starts with an
3053 initial node from make_dummy_type, which may yield the same
3054 node as the one we got.
3056 Besides, variants of this non-dummy type might have been
3057 created along the way. update_pointer_to is expected to
3058 properly take care of those situations. */
3062 struct incomplete *p
3063 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3065 p->old_type = gnu_old_type;
3066 p->full_type = gnat_desig_type;
3067 p->next = defer_incomplete_list;
3068 defer_incomplete_list = p;
3074 case E_Access_Protected_Subprogram_Type:
3075 case E_Anonymous_Access_Protected_Subprogram_Type:
3076 if (type_annotate_only && No (Equivalent_Type (gnat_entity)))
3077 gnu_type = build_pointer_type (void_type_node);
3079 /* The runtime representation is the equivalent type. */
3080 gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
3082 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3083 && ! present_gnu_tree (Directly_Designated_Type (gnat_entity))
3084 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3085 && ! Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3086 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3091 case E_Access_Subtype:
3093 /* We treat this as identical to its base type; any constraint is
3094 meaningful only to the front end.
3096 The designated type must be elaborated as well, if it does
3097 not have its own freeze node. Designated (sub)types created
3098 for constrained components of records with discriminants are
3099 not frozen by the front end and thus not elaborated by gigi,
3100 because their use may appear before the base type is frozen,
3101 and because it is not clear that they are needed anywhere in
3102 Gigi. With the current model, there is no correct place where
3103 they could be elaborated. */
3105 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3106 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3107 && ! present_gnu_tree (Directly_Designated_Type (gnat_entity))
3108 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3109 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3111 /* If we are not defining this entity, and we have incomplete
3112 entities being processed above us, make a dummy type and
3113 elaborate it later. */
3114 if (! definition && defer_incomplete_level != 0)
3116 struct incomplete *p
3117 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3119 = build_pointer_type
3120 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3122 p->old_type = TREE_TYPE (gnu_ptr_type);
3123 p->full_type = Directly_Designated_Type (gnat_entity);
3124 p->next = defer_incomplete_list;
3125 defer_incomplete_list = p;
3128 (IN (Ekind (Base_Type (Directly_Designated_Type (gnat_entity))),
3129 Incomplete_Or_Private_Kind))
3132 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3139 /* Subprogram Entities
3141 The following access functions are defined for subprograms (functions
3144 First_Formal The first formal parameter.
3145 Is_Imported Indicates that the subprogram has appeared in
3146 an INTERFACE or IMPORT pragma. For now we
3147 assume that the external language is C.
3148 Is_Inlined True if the subprogram is to be inlined.
3150 In addition for function subprograms we have:
3152 Etype Return type of the function.
3154 Each parameter is first checked by calling must_pass_by_ref on its
3155 type to determine if it is passed by reference. For parameters which
3156 are copied in, if they are Ada IN OUT or OUT parameters, their return
3157 value becomes part of a record which becomes the return type of the
3158 function (C function - note that this applies only to Ada procedures
3159 so there is no Ada return type). Additional code to store back the
3160 parameters will be generated on the caller side. This transformation
3161 is done here, not in the front-end.
3163 The intended result of the transformation can be seen from the
3164 equivalent source rewritings that follow:
3166 struct temp {int a,b};
3167 procedure P (A,B: IN OUT ...) is temp P (int A,B) {
3169 end P; return {A,B};
3179 For subprogram types we need to perform mainly the same conversions to
3180 GCC form that are needed for procedures and function declarations. The
3181 only difference is that at the end, we make a type declaration instead
3182 of a function declaration. */
3184 case E_Subprogram_Type:
3188 /* The first GCC parameter declaration (a PARM_DECL node). The
3189 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3190 actually is the head of this parameter list. */
3191 tree gnu_param_list = NULL_TREE;
3192 /* The type returned by a function. If the subprogram is a procedure
3193 this type should be void_type_node. */
3194 tree gnu_return_type = void_type_node;
3195 /* List of fields in return type of procedure with copy in copy out
3197 tree gnu_field_list = NULL_TREE;
3198 /* Non-null for subprograms containing parameters passed by copy in
3199 copy out (Ada IN OUT or OUT parameters not passed by reference),
3200 in which case it is the list of nodes used to specify the values of
3201 the in out/out parameters that are returned as a record upon
3202 procedure return. The TREE_PURPOSE of an element of this list is
3203 a field of the record and the TREE_VALUE is the PARM_DECL
3204 corresponding to that field. This list will be saved in the
3205 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3206 tree gnu_return_list = NULL_TREE;
3207 Entity_Id gnat_param;
3208 int inline_flag = Is_Inlined (gnat_entity);
3209 int public_flag = Is_Public (gnat_entity);
3211 = (Is_Public (gnat_entity) && !definition) || imported_p;
3212 int pure_flag = Is_Pure (gnat_entity);
3213 int volatile_flag = No_Return (gnat_entity);
3214 int returns_by_ref = 0;
3215 int returns_unconstrained = 0;
3216 tree gnu_ext_name = create_concat_name (gnat_entity, 0);
3217 int has_copy_in_out = 0;
3220 if (kind == E_Subprogram_Type && ! definition)
3221 /* A parameter may refer to this type, so defer completion
3222 of any incomplete types. */
3223 defer_incomplete_level++, this_deferred = 1;
3225 /* If the subprogram has an alias, it is probably inherited, so
3226 we can use the original one. If the original "subprogram"
3227 is actually an enumeration literal, it may be the first use
3228 of its type, so we must elaborate that type now. */
3229 if (Present (Alias (gnat_entity)))
3231 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3232 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3234 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3237 /* Elaborate any Itypes in the parameters of this entity. */
3238 for (gnat_temp = First_Formal (gnat_entity);
3239 Present (gnat_temp);
3240 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3241 if (Is_Itype (Etype (gnat_temp)))
3242 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3247 if (kind == E_Function || kind == E_Subprogram_Type)
3248 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3250 /* If this function returns by reference, make the actual
3251 return type of this function the pointer and mark the decl. */
3252 if (Returns_By_Ref (gnat_entity))
3255 gnu_return_type = build_pointer_type (gnu_return_type);
3258 /* If the Mechanism is By_Reference, ensure the return type uses
3259 the machine's by-reference mechanism, which may not the same
3260 as above (e.g., it might be by passing a fake parameter). */
3261 else if (kind == E_Function
3262 && Mechanism (gnat_entity) == By_Reference)
3264 gnu_return_type = copy_type (gnu_return_type);
3265 TREE_ADDRESSABLE (gnu_return_type) = 1;
3268 /* If we are supposed to return an unconstrained array,
3269 actually return a fat pointer and make a note of that. Return
3270 a pointer to an unconstrained record of variable size. */
3271 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3273 gnu_return_type = TREE_TYPE (gnu_return_type);
3274 returns_unconstrained = 1;
3277 /* If the type requires a transient scope, the result is allocated
3278 on the secondary stack, so the result type of the function is
3280 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3282 gnu_return_type = build_pointer_type (gnu_return_type);
3283 returns_unconstrained = 1;
3286 /* If the type is a padded type and the underlying type would not
3287 be passed by reference or this function has a foreign convention,
3288 return the underlying type. */
3289 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3290 && TYPE_IS_PADDING_P (gnu_return_type)
3291 && (! default_pass_by_ref (TREE_TYPE
3292 (TYPE_FIELDS (gnu_return_type)))
3293 || Has_Foreign_Convention (gnat_entity)))
3294 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3296 /* Look at all our parameters and get the type of
3297 each. While doing this, build a copy-out structure if
3300 /* If the return type has a size that overflows, we cannot have
3301 a function that returns that type. This usage doesn't make
3302 sense anyway, so give an error here. */
3303 if (TYPE_SIZE_UNIT (gnu_return_type)
3304 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3306 post_error ("cannot return type whose size overflows",
3308 gnu_return_type = copy_node (gnu_return_type);
3309 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3310 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3311 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3312 TYPE_NEXT_VARIANT (gnu_return_type) = 0;
3315 for (gnat_param = First_Formal (gnat_entity), parmnum = 0;
3316 Present (gnat_param);
3317 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3319 tree gnu_param_name = get_entity_name (gnat_param);
3320 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3321 tree gnu_param, gnu_field;
3324 int by_component_ptr_p = 0;
3325 int copy_in_copy_out_flag = 0;
3326 int req_by_copy = 0, req_by_ref = 0;
3328 /* See if a Mechanism was supplied that forced this
3329 parameter to be passed one way or another. */
3330 if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3332 else if (Mechanism (gnat_param) == Default)
3334 else if (Mechanism (gnat_param) == By_Copy)
3336 else if (Mechanism (gnat_param) == By_Reference)
3338 else if (Mechanism (gnat_param) <= By_Descriptor)
3340 else if (Mechanism (gnat_param) > 0)
3342 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
3343 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
3344 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
3345 Mechanism (gnat_param)))
3351 post_error ("unsupported mechanism for&", gnat_param);
3353 /* If this is either a foreign function or if the
3354 underlying type won't be passed by refererence, strip off
3355 possible padding type. */
3356 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
3357 && TYPE_IS_PADDING_P (gnu_param_type)
3358 && (req_by_ref || Has_Foreign_Convention (gnat_entity)
3359 || ! must_pass_by_ref (TREE_TYPE (TYPE_FIELDS
3360 (gnu_param_type)))))
3361 gnu_param_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
3363 /* If this is an IN parameter it is read-only, so make a variant
3364 of the type that is read-only.
3366 ??? However, if this is an unconstrained array, that type can
3367 be very complex. So skip it for now. Likewise for any other
3368 self-referential type. */
3369 if (Ekind (gnat_param) == E_In_Parameter
3370 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
3371 && ! (TYPE_SIZE (gnu_param_type) != 0
3372 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))))
3374 = build_qualified_type (gnu_param_type,
3375 (TYPE_QUALS (gnu_param_type)
3376 | TYPE_QUAL_CONST));
3378 /* For foreign conventions, pass arrays as a pointer to the
3379 underlying type. First check for unconstrained array and get
3380 the underlying array. Then get the component type and build
3382 if (Has_Foreign_Convention (gnat_entity)
3383 && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
3385 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS
3386 (TREE_TYPE (gnu_param_type))));
3390 = build_pointer_type
3391 (build_vms_descriptor (gnu_param_type,
3392 Mechanism (gnat_param),
3395 else if (Has_Foreign_Convention (gnat_entity)
3397 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
3399 /* Strip off any multi-dimensional entries, then strip
3400 off the last array to get the component type. */
3401 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
3402 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
3403 gnu_param_type = TREE_TYPE (gnu_param_type);
3405 by_component_ptr_p = 1;
3406 gnu_param_type = TREE_TYPE (gnu_param_type);
3408 if (Ekind (gnat_param) == E_In_Parameter)
3410 = build_qualified_type (gnu_param_type,
3411 (TYPE_QUALS (gnu_param_type)
3412 | TYPE_QUAL_CONST));
3414 gnu_param_type = build_pointer_type (gnu_param_type);
3417 /* Fat pointers are passed as thin pointers for foreign
3419 else if (Has_Foreign_Convention (gnat_entity)
3420 && TYPE_FAT_POINTER_P (gnu_param_type))
3422 = make_type_from_size (gnu_param_type,
3423 size_int (POINTER_SIZE), 0);
3425 /* If we must pass or were requested to pass by reference, do so.
3426 If we were requested to pass by copy, do so.
3427 Otherwise, for foreign conventions, pass all in out parameters
3428 or aggregates by reference. For COBOL and Fortran, pass
3429 all integer and FP types that way too. For Convention Ada,
3430 use the standard Ada default. */
3431 else if (must_pass_by_ref (gnu_param_type) || req_by_ref
3433 && ((Has_Foreign_Convention (gnat_entity)
3434 && (Ekind (gnat_param) != E_In_Parameter
3435 || AGGREGATE_TYPE_P (gnu_param_type)))
3436 || (((Convention (gnat_entity)
3437 == Convention_Fortran)
3438 || (Convention (gnat_entity)
3439 == Convention_COBOL))
3440 && (INTEGRAL_TYPE_P (gnu_param_type)
3441 || FLOAT_TYPE_P (gnu_param_type)))
3442 /* For convention Ada, see if we pass by reference
3444 || (! Has_Foreign_Convention (gnat_entity)
3445 && default_pass_by_ref (gnu_param_type)))))
3447 gnu_param_type = build_reference_type (gnu_param_type);
3451 else if (Ekind (gnat_param) != E_In_Parameter)
3452 copy_in_copy_out_flag = 1;
3454 if (req_by_copy && (by_ref_p || by_component_ptr_p))
3455 post_error ("?cannot pass & by copy", gnat_param);
3457 /* If this is an OUT parameter that isn't passed by reference
3458 and isn't a pointer or aggregate, we don't make a PARM_DECL
3459 for it. Instead, it will be a VAR_DECL created when we process
3460 the procedure. For the special parameter of Valued_Procedure,
3463 An exception is made to cover the RM-6.4.1 rule requiring "by
3464 copy" out parameters with discriminants or implicit initial
3465 values to be handled like in out parameters. These type are
3466 normally built as aggregates, and hence passed by reference,
3467 except for some packed arrays which end up encoded in special
3470 The exception we need to make is then for packed arrays of
3471 records with discriminants or implicit initial values. We have
3472 no light/easy way to check for the latter case, so we merely
3473 check for packed arrays of records. This may lead to useless
3474 copy-in operations, but in very rare cases only, as these would
3475 be exceptions in a set of already exceptional situations. */
3476 if (Ekind (gnat_param) == E_Out_Parameter && ! by_ref_p
3477 && ((Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3479 && ! POINTER_TYPE_P (gnu_param_type)
3480 && ! AGGREGATE_TYPE_P (gnu_param_type)))
3481 && ! (Is_Array_Type (Etype (gnat_param))
3482 && Is_Packed (Etype (gnat_param))
3483 && Is_Composite_Type (Component_Type
3484 (Etype (gnat_param)))))
3490 (gnu_param_name, gnu_param_type,
3491 by_ref_p || by_component_ptr_p
3492 || Ekind (gnat_param) == E_In_Parameter);
3494 DECL_BY_REF_P (gnu_param) = by_ref_p;
3495 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr_p;
3496 DECL_BY_DESCRIPTOR_P (gnu_param) = by_descr_p;
3497 DECL_POINTS_TO_READONLY_P (gnu_param)
3498 = (Ekind (gnat_param) == E_In_Parameter
3499 && (by_ref_p || by_component_ptr_p));
3500 annotate_decl_with_node (gnu_param, gnat_param);
3501 save_gnu_tree (gnat_param, gnu_param, 0);
3502 gnu_param_list = chainon (gnu_param, gnu_param_list);
3504 /* If a parameter is a pointer, this function may modify
3505 memory through it and thus shouldn't be considered
3506 a pure function. Also, the memory may be modified
3507 between two calls, so they can't be CSE'ed. The latter
3508 case also handles by-ref parameters. */
3509 if (POINTER_TYPE_P (gnu_param_type)
3510 || TYPE_FAT_POINTER_P (gnu_param_type))
3514 if (copy_in_copy_out_flag)
3516 if (! has_copy_in_out)
3518 if (TREE_CODE (gnu_return_type) != VOID_TYPE)
3521 gnu_return_type = make_node (RECORD_TYPE);
3522 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
3523 has_copy_in_out = 1;
3526 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
3527 gnu_return_type, 0, 0, 0, 0);
3528 annotate_decl_with_node (gnu_field, gnat_param);
3529 TREE_CHAIN (gnu_field) = gnu_field_list;
3530 gnu_field_list = gnu_field;
3531 gnu_return_list = tree_cons (gnu_field, gnu_param,
3536 /* Do not compute record for out parameters if subprogram is
3537 stubbed since structures are incomplete for the back-end. */
3538 if (gnu_field_list != 0
3539 && Convention (gnat_entity) != Convention_Stubbed)
3540 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
3543 /* If we have a CICO list but it has only one entry, we convert
3544 this function into a function that simply returns that one
3546 if (list_length (gnu_return_list) == 1)
3547 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
3550 if (Convention (gnat_entity) == Convention_Stdcall)
3553 = (struct attrib *) xmalloc (sizeof (struct attrib));
3555 attr->next = attr_list;
3556 attr->type = ATTR_MACHINE_ATTRIBUTE;
3557 attr->name = get_identifier ("stdcall");
3558 attr->arg = NULL_TREE;
3559 attr->error_point = gnat_entity;
3564 /* Both lists ware built in reverse. */
3565 gnu_param_list = nreverse (gnu_param_list);
3566 gnu_return_list = nreverse (gnu_return_list);
3569 = create_subprog_type (gnu_return_type, gnu_param_list,
3570 gnu_return_list, returns_unconstrained,
3572 Function_Returns_With_DSP (gnat_entity));
3574 /* ??? For now, don't consider nested functions pure. */
3575 if (! global_bindings_p ())
3578 /* A subprogram (something that doesn't return anything) shouldn't
3579 be considered Pure since there would be no reason for such a
3580 subprogram. Note that procedures with Out (or In Out) parameters
3581 have already been converted into a function with a return type. */
3582 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
3586 = build_qualified_type (gnu_type,
3587 (TYPE_QUALS (gnu_type)
3588 | (TYPE_QUAL_CONST * pure_flag)
3589 | (TYPE_QUAL_VOLATILE * volatile_flag)));
3591 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3593 /* If there was no specified Interface_Name and the external and
3594 internal names of the subprogram are the same, only use the
3595 internal name to allow disambiguation of nested subprograms. */
3596 if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_id)
3599 /* If we are defining the subprogram and it has an Address clause
3600 we must get the address expression from the saved GCC tree for the
3601 subprogram if it has a Freeze_Node. Otherwise, we elaborate
3602 the address expression here since the front-end has guaranteed
3603 in that case that the elaboration has no effects. If there is
3604 an Address clause and we are not defining the object, just
3605 make it a constant. */
3606 if (Present (Address_Clause (gnat_entity)))
3608 tree gnu_address = 0;
3612 = (present_gnu_tree (gnat_entity)
3613 ? get_gnu_tree (gnat_entity)
3614 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
3616 save_gnu_tree (gnat_entity, NULL_TREE, 0);
3618 gnu_type = build_reference_type (gnu_type);
3619 if (gnu_address != 0)
3620 gnu_address = convert (gnu_type, gnu_address);
3623 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
3624 gnu_address, 0, Is_Public (gnat_entity),
3626 DECL_BY_REF_P (gnu_decl) = 1;
3627 add_decl_stmt (gnu_decl, gnat_entity);
3630 else if (kind == E_Subprogram_Type)
3631 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3632 ! Comes_From_Source (gnat_entity),
3636 gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name,
3637 gnu_type, gnu_param_list,
3638 inline_flag, public_flag,
3639 extern_flag, attr_list);
3640 DECL_STUBBED_P (gnu_decl)
3641 = Convention (gnat_entity) == Convention_Stubbed;
3646 case E_Incomplete_Type:
3647 case E_Private_Type:
3648 case E_Limited_Private_Type:
3649 case E_Record_Type_With_Private:
3650 case E_Private_Subtype:
3651 case E_Limited_Private_Subtype:
3652 case E_Record_Subtype_With_Private:
3654 /* If this type does not have a full view in the unit we are
3655 compiling, then just get the type from its Etype. */
3656 if (No (Full_View (gnat_entity)))
3658 /* If this is an incomplete type with no full view, it must
3659 be a Taft Amendement type, so just return a dummy type. */
3660 if (kind == E_Incomplete_Type)
3661 gnu_type = make_dummy_type (gnat_entity);
3663 else if (Present (Underlying_Full_View (gnat_entity)))
3664 gnu_decl = gnat_to_gnu_entity (Underlying_Full_View (gnat_entity),
3668 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
3676 /* Otherwise, if we are not defining the type now, get the
3677 type from the full view. But always get the type from the full
3678 view for define on use types, since otherwise we won't see them! */
3680 else if (! definition
3681 || (Is_Itype (Full_View (gnat_entity))
3682 && No (Freeze_Node (gnat_entity)))
3683 || (Is_Itype (gnat_entity)
3684 && No (Freeze_Node (Full_View (gnat_entity)))))
3686 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
3692 /* For incomplete types, make a dummy type entry which will be
3694 gnu_type = make_dummy_type (gnat_entity);
3696 /* Save this type as the full declaration's type so we can do any needed
3697 updates when we see it. */
3698 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3699 ! Comes_From_Source (gnat_entity),
3701 annotate_decl_with_node (gnu_decl, gnat_entity);
3702 save_gnu_tree (Full_View (gnat_entity), gnu_decl, 0);
3705 /* Simple class_wide types are always viewed as their root_type
3706 by Gigi unless an Equivalent_Type is specified. */
3707 case E_Class_Wide_Type:
3708 if (Present (Equivalent_Type (gnat_entity)))
3709 gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
3711 gnu_type = gnat_to_gnu_type (Root_Type (gnat_entity));
3717 case E_Task_Subtype:
3718 case E_Protected_Type:
3719 case E_Protected_Subtype:
3720 if (type_annotate_only && No (Corresponding_Record_Type (gnat_entity)))
3721 gnu_type = void_type_node;
3723 gnu_type = gnat_to_gnu_type (Corresponding_Record_Type (gnat_entity));
3729 gnu_decl = create_label_decl (gnu_entity_id);
3734 /* Nothing at all to do here, so just return an ERROR_MARK and claim
3735 we've already saved it, so we don't try to. */
3736 gnu_decl = error_mark_node;
3744 /* If we had a case where we evaluated another type and it might have
3745 defined this one, handle it here. */
3746 if (maybe_present && present_gnu_tree (gnat_entity))
3748 gnu_decl = get_gnu_tree (gnat_entity);
3752 /* If we are processing a type and there is either no decl for it or
3753 we just made one, do some common processing for the type, such as
3754 handling alignment and possible padding. */
3756 if ((gnu_decl == 0 || this_made_decl) && IN (kind, Type_Kind))
3758 if (Is_Tagged_Type (gnat_entity)
3759 || Is_Class_Wide_Equivalent_Type (gnat_entity))
3760 TYPE_ALIGN_OK (gnu_type) = 1;
3762 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
3763 TYPE_BY_REFERENCE_P (gnu_type) = 1;
3765 /* ??? Don't set the size for a String_Literal since it is either
3766 confirming or we don't handle it properly (if the low bound is
3768 if (gnu_size == 0 && kind != E_String_Literal_Subtype)
3769 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
3770 TYPE_DECL, 0, Has_Size_Clause (gnat_entity));
3772 /* If a size was specified, see if we can make a new type of that size
3773 by rearranging the type, for example from a fat to a thin pointer. */
3777 = make_type_from_size (gnu_type, gnu_size,
3778 Has_Biased_Representation (gnat_entity));
3780 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
3781 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
3785 /* If the alignment hasn't already been processed and this is
3786 not an unconstrained array, see if an alignment is specified.
3787 If not, we pick a default alignment for atomic objects. */
3788 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
3790 else if (Known_Alignment (gnat_entity))
3791 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
3792 TYPE_ALIGN (gnu_type));
3793 else if (Is_Atomic (gnat_entity) && gnu_size == 0
3794 && host_integerp (TYPE_SIZE (gnu_type), 1)
3795 && integer_pow2p (TYPE_SIZE (gnu_type)))
3796 align = MIN (BIGGEST_ALIGNMENT,
3797 tree_low_cst (TYPE_SIZE (gnu_type), 1));
3798 else if (Is_Atomic (gnat_entity) && gnu_size != 0
3799 && host_integerp (gnu_size, 1)
3800 && integer_pow2p (gnu_size))
3801 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
3803 /* See if we need to pad the type. If we did, and made a record,
3804 the name of the new type may be changed. So get it back for
3805 us when we make the new TYPE_DECL below. */
3806 gnu_type = maybe_pad_type (gnu_type, gnu_size, align,
3807 gnat_entity, "PAD", 1, definition, 0);
3808 if (TREE_CODE (gnu_type) == RECORD_TYPE
3809 && TYPE_IS_PADDING_P (gnu_type))
3811 gnu_entity_id = TYPE_NAME (gnu_type);
3812 if (TREE_CODE (gnu_entity_id) == TYPE_DECL)
3813 gnu_entity_id = DECL_NAME (gnu_entity_id);
3816 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
3818 /* If we are at global level, GCC will have applied variable_size to
3819 the type, but that won't have done anything. So, if it's not
3820 a constant or self-referential, call elaborate_expression_1 to
3821 make a variable for the size rather than calculating it each time.
3822 Handle both the RM size and the actual size. */
3823 if (global_bindings_p ()
3824 && TYPE_SIZE (gnu_type) != 0
3825 && ! TREE_CONSTANT (TYPE_SIZE (gnu_type))
3826 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3828 if (TREE_CODE (gnu_type) == RECORD_TYPE
3829 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
3830 TYPE_SIZE (gnu_type), 0))
3832 TYPE_SIZE (gnu_type)
3833 = elaborate_expression_1 (gnat_entity, gnat_entity,
3834 TYPE_SIZE (gnu_type),
3835 get_identifier ("SIZE"),
3837 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
3841 TYPE_SIZE (gnu_type)
3842 = elaborate_expression_1 (gnat_entity, gnat_entity,
3843 TYPE_SIZE (gnu_type),
3844 get_identifier ("SIZE"),
3847 /* ??? For now, store the size as a multiple of the alignment
3848 in bytes so that we can see the alignment from the tree. */
3849 TYPE_SIZE_UNIT (gnu_type)
3851 (MULT_EXPR, sizetype,
3852 elaborate_expression_1
3853 (gnat_entity, gnat_entity,
3854 build_binary_op (EXACT_DIV_EXPR, sizetype,
3855 TYPE_SIZE_UNIT (gnu_type),
3856 size_int (TYPE_ALIGN (gnu_type)
3858 get_identifier ("SIZE_A_UNIT"),
3860 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
3862 if (TREE_CODE (gnu_type) == RECORD_TYPE)
3865 elaborate_expression_1 (gnat_entity,
3867 TYPE_ADA_SIZE (gnu_type),
3868 get_identifier ("RM_SIZE"),
3873 /* If this is a record type or subtype, call elaborate_expression_1 on
3874 any field position. Do this for both global and local types.
3875 Skip any fields that we haven't made trees for to avoid problems with
3876 class wide types. */
3877 if (IN (kind, Record_Kind))
3878 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3879 gnat_temp = Next_Entity (gnat_temp))
3880 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
3882 tree gnu_field = get_gnu_tree (gnat_temp);
3884 /* ??? Unfortunately, GCC needs to be able to prove the
3885 alignment of this offset and if it's a variable, it can't.
3886 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
3887 right now, we have to put in an explicit multiply and
3888 divide by that value. */
3889 if (! CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
3890 DECL_FIELD_OFFSET (gnu_field)
3892 (MULT_EXPR, sizetype,
3893 elaborate_expression_1
3894 (gnat_temp, gnat_temp,
3895 build_binary_op (EXACT_DIV_EXPR, sizetype,
3896 DECL_FIELD_OFFSET (gnu_field),
3897 size_int (DECL_OFFSET_ALIGN (gnu_field)
3899 get_identifier ("OFFSET"),
3901 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
3904 gnu_type = build_qualified_type (gnu_type,
3905 (TYPE_QUALS (gnu_type)
3906 | (TYPE_QUAL_VOLATILE
3907 * Treat_As_Volatile (gnat_entity))));
3909 if (Is_Atomic (gnat_entity))
3910 check_ok_for_atomic (gnu_type, gnat_entity, 0);
3912 if (Known_Alignment (gnat_entity))
3913 TYPE_USER_ALIGN (gnu_type) = 1;
3917 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3918 ! Comes_From_Source (gnat_entity),
3920 annotate_decl_with_node (gnu_decl, gnat_entity);
3923 TREE_TYPE (gnu_decl) = gnu_type;
3925 add_decl_stmt (gnu_decl, gnat_entity);
3928 if (IN (kind, Type_Kind) && ! TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
3930 gnu_type = TREE_TYPE (gnu_decl);
3932 /* Back-annotate the Alignment of the type if not already in the
3933 tree. Likewise for sizes. */
3934 if (Unknown_Alignment (gnat_entity))
3935 Set_Alignment (gnat_entity,
3936 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
3938 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type) != 0)
3940 /* If the size is self-referential, we annotate the maximum
3941 value of that size. */
3942 tree gnu_size = TYPE_SIZE (gnu_type);
3944 if (CONTAINS_PLACEHOLDER_P (gnu_size))
3945 gnu_size = max_size (gnu_size, 1);
3947 Set_Esize (gnat_entity, annotate_value (gnu_size));
3949 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
3951 /* In this mode the tag and the parent components are not
3952 generated by the front-end, so the sizes must be adjusted
3958 if (Is_Derived_Type (gnat_entity))
3961 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
3962 Set_Alignment (gnat_entity,
3963 Alignment (Etype (Base_Type (gnat_entity))));
3966 size_offset = POINTER_SIZE;
3968 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
3969 Set_Esize (gnat_entity,
3970 UI_From_Int (((new_size + (POINTER_SIZE - 1))
3971 / POINTER_SIZE) * POINTER_SIZE));
3972 Set_RM_Size (gnat_entity, Esize (gnat_entity));
3976 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type) != 0)
3977 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
3980 if (! Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
3981 DECL_ARTIFICIAL (gnu_decl) = 1;
3983 if (! debug_info_p && DECL_P (gnu_decl)
3984 && TREE_CODE (gnu_decl) != FUNCTION_DECL)
3985 DECL_IGNORED_P (gnu_decl) = 1;
3987 /* If we haven't already, associate the ..._DECL node that we just made with
3988 the input GNAT entity node. */
3990 save_gnu_tree (gnat_entity, gnu_decl, 0);
3992 /* If this is an enumeral or floating-point type, we were not able to set
3993 the bounds since they refer to the type. These bounds are always static.
3995 For enumeration types, also write debugging information and declare the
3996 enumeration literal table, if needed. */
3998 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
3999 || (kind == E_Floating_Point_Type && ! Vax_Float (gnat_entity)))
4001 tree gnu_scalar_type = gnu_type;
4003 /* If this is a padded type, we need to use the underlying type. */
4004 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4005 && TYPE_IS_PADDING_P (gnu_scalar_type))
4006 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4008 /* If this is a floating point type and we haven't set a floating
4009 point type yet, use this in the evaluation of the bounds. */
4010 if (longest_float_type_node == 0 && kind == E_Floating_Point_Type)
4011 longest_float_type_node = gnu_type;
4013 TYPE_MIN_VALUE (gnu_scalar_type)
4014 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4015 TYPE_MAX_VALUE (gnu_scalar_type)
4016 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4018 if (kind == E_Enumeration_Type)
4020 TYPE_STUB_DECL (gnu_scalar_type) = gnu_decl;
4022 /* Since this has both a typedef and a tag, avoid outputting
4024 DECL_ARTIFICIAL (gnu_decl) = 1;
4025 rest_of_type_compilation (gnu_scalar_type, global_bindings_p ());
4029 /* If we deferred processing of incomplete types, re-enable it. If there
4030 were no other disables and we have some to process, do so. */
4031 if (this_deferred && --defer_incomplete_level == 0
4032 && defer_incomplete_list != 0)
4034 struct incomplete *incp = defer_incomplete_list;
4035 struct incomplete *next;
4037 defer_incomplete_list = 0;
4038 for (; incp; incp = next)
4042 if (incp->old_type != 0)
4043 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4044 gnat_to_gnu_type (incp->full_type));
4049 /* If we are not defining this type, see if it's in the incomplete list.
4050 If so, handle that list entry now. */
4051 else if (! definition)
4053 struct incomplete *incp;
4055 for (incp = defer_incomplete_list; incp; incp = incp->next)
4056 if (incp->old_type != 0 && incp->full_type == gnat_entity)
4058 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4059 TREE_TYPE (gnu_decl));
4067 if (Is_Packed_Array_Type (gnat_entity)
4068 && Is_Itype (Associated_Node_For_Itype (gnat_entity))
4069 && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity)))
4070 && ! present_gnu_tree (Associated_Node_For_Itype (gnat_entity)))
4071 gnat_to_gnu_entity (Associated_Node_For_Itype (gnat_entity), NULL_TREE, 0);
4076 /* Given GNAT_ENTITY, elaborate all expressions that are required to
4077 be elaborated at the point of its definition, but do nothing else. */
4080 elaborate_entity (Entity_Id gnat_entity)
4082 switch (Ekind (gnat_entity))
4084 case E_Signed_Integer_Subtype:
4085 case E_Modular_Integer_Subtype:
4086 case E_Enumeration_Subtype:
4087 case E_Ordinary_Fixed_Point_Subtype:
4088 case E_Decimal_Fixed_Point_Subtype:
4089 case E_Floating_Point_Subtype:
4091 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
4092 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
4094 /* ??? Tests for avoiding static constaint error expression
4095 is needed until the front stops generating bogus conversions
4096 on bounds of real types. */
4098 if (! Raises_Constraint_Error (gnat_lb))
4099 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
4100 1, 0, Needs_Debug_Info (gnat_entity));
4101 if (! Raises_Constraint_Error (gnat_hb))
4102 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
4103 1, 0, Needs_Debug_Info (gnat_entity));
4109 Node_Id full_definition = Declaration_Node (gnat_entity);
4110 Node_Id record_definition = Type_Definition (full_definition);
4112 /* If this is a record extension, go a level further to find the
4113 record definition. */
4114 if (Nkind (record_definition) == N_Derived_Type_Definition)
4115 record_definition = Record_Extension_Part (record_definition);
4119 case E_Record_Subtype:
4120 case E_Private_Subtype:
4121 case E_Limited_Private_Subtype:
4122 case E_Record_Subtype_With_Private:
4123 if (Is_Constrained (gnat_entity)
4124 && Has_Discriminants (Base_Type (gnat_entity))
4125 && Present (Discriminant_Constraint (gnat_entity)))
4127 Node_Id gnat_discriminant_expr;
4128 Entity_Id gnat_field;
4130 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
4131 gnat_discriminant_expr
4132 = First_Elmt (Discriminant_Constraint (gnat_entity));
4133 Present (gnat_field);
4134 gnat_field = Next_Discriminant (gnat_field),
4135 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
4136 /* ??? For now, ignore access discriminants. */
4137 if (! Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
4138 elaborate_expression (Node (gnat_discriminant_expr),
4140 get_entity_name (gnat_field), 1, 0, 0);
4147 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
4148 any entities on its entity chain similarly. */
4151 mark_out_of_scope (Entity_Id gnat_entity)
4153 Entity_Id gnat_sub_entity;
4154 unsigned int kind = Ekind (gnat_entity);
4156 /* If this has an entity list, process all in the list. */
4157 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
4158 || IN (kind, Private_Kind)
4159 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
4160 || kind == E_Function || kind == E_Generic_Function
4161 || kind == E_Generic_Package || kind == E_Generic_Procedure
4162 || kind == E_Loop || kind == E_Operator || kind == E_Package
4163 || kind == E_Package_Body || kind == E_Procedure
4164 || kind == E_Record_Type || kind == E_Record_Subtype
4165 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
4166 for (gnat_sub_entity = First_Entity (gnat_entity);
4167 Present (gnat_sub_entity);
4168 gnat_sub_entity = Next_Entity (gnat_sub_entity))
4169 if (Scope (gnat_sub_entity) == gnat_entity
4170 && gnat_sub_entity != gnat_entity)
4171 mark_out_of_scope (gnat_sub_entity);
4173 /* Now clear this if it has been defined, but only do so if it isn't
4174 a subprogram or parameter. We could refine this, but it isn't
4175 worth it. If this is statically allocated, it is supposed to
4176 hang around out of cope. */
4177 if (present_gnu_tree (gnat_entity) && ! Is_Statically_Allocated (gnat_entity)
4178 && kind != E_Procedure && kind != E_Function && ! IN (kind, Formal_Kind))
4180 save_gnu_tree (gnat_entity, NULL_TREE, 1);
4181 save_gnu_tree (gnat_entity, error_mark_node, 1);
4185 /* Set the alias set of GNU_NEW_TYPE to be that of GNU_OLD_TYPE. If this
4186 is a multi-dimensional array type, do this recursively. */
4189 copy_alias_set (tree gnu_new_type, tree gnu_old_type)
4191 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
4192 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
4193 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
4195 /* We need to be careful here in case GNU_OLD_TYPE is an unconstrained
4196 array. In that case, it doesn't have the same shape as GNU_NEW_TYPE,
4197 so we need to go down to what does. */
4198 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
4200 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
4202 copy_alias_set (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type));
4205 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
4206 record_component_aliases (gnu_new_type);
4209 /* Return a TREE_LIST describing the substitutions needed to reflect
4210 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
4211 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
4212 of GNAT_SUBTYPE. The substitions can be in any order. TREE_PURPOSE
4213 gives the tree for the discriminant and TREE_VALUES is the replacement
4214 value. They are in the form of operands to substitute_in_expr.
4215 DEFINITION is as in gnat_to_gnu_entity. */
4218 substitution_list (Entity_Id gnat_subtype,
4219 Entity_Id gnat_type,
4223 Entity_Id gnat_discrim;
4227 gnat_type = Implementation_Base_Type (gnat_subtype);
4229 if (Has_Discriminants (gnat_type))
4230 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
4231 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
4232 Present (gnat_discrim);
4233 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
4234 gnat_value = Next_Elmt (gnat_value))
4235 /* Ignore access discriminants. */
4236 if (! Is_Access_Type (Etype (Node (gnat_value))))
4237 gnu_list = tree_cons (gnat_to_gnu_entity (gnat_discrim, NULL_TREE, 0),
4238 elaborate_expression
4239 (Node (gnat_value), gnat_subtype,
4240 get_entity_name (gnat_discrim), definition,
4247 /* For the following two functions: for each GNAT entity, the GCC
4248 tree node used as a dummy for that entity, if any. */
4250 static GTY((length ("max_gnat_nodes"))) tree * dummy_node_table;
4252 /* Initialize the above table. */
4255 init_dummy_type (void)
4259 dummy_node_table = (tree *) ggc_alloc (max_gnat_nodes * sizeof (tree));
4261 for (gnat_node = 0; gnat_node < max_gnat_nodes; gnat_node++)
4262 dummy_node_table[gnat_node] = NULL_TREE;
4264 dummy_node_table -= First_Node_Id;
4267 /* Make a dummy type corresponding to GNAT_TYPE. */
4270 make_dummy_type (Entity_Id gnat_type)
4272 Entity_Id gnat_underlying;
4275 /* Find a full type for GNAT_TYPE, taking into account any class wide
4277 if (Is_Class_Wide_Type (gnat_type) && Present (Equivalent_Type (gnat_type)))
4278 gnat_type = Equivalent_Type (gnat_type);
4279 else if (Ekind (gnat_type) == E_Class_Wide_Type)
4280 gnat_type = Root_Type (gnat_type);
4282 for (gnat_underlying = gnat_type;
4283 (IN (Ekind (gnat_underlying), Incomplete_Or_Private_Kind)
4284 && Present (Full_View (gnat_underlying)));
4285 gnat_underlying = Full_View (gnat_underlying))
4288 /* If it there already a dummy type, use that one. Else make one. */
4289 if (dummy_node_table[gnat_underlying])
4290 return dummy_node_table[gnat_underlying];
4292 /* If this is a record, make this a RECORD_TYPE or UNION_TYPE; else make
4294 if (Is_Record_Type (gnat_underlying))
4295 gnu_type = make_node (Is_Unchecked_Union (gnat_underlying)
4296 ? UNION_TYPE : RECORD_TYPE);
4298 gnu_type = make_node (ENUMERAL_TYPE);
4300 TYPE_NAME (gnu_type) = get_entity_name (gnat_type);
4301 if (AGGREGATE_TYPE_P (gnu_type))
4302 TYPE_STUB_DECL (gnu_type)
4303 = pushdecl (build_decl (TYPE_DECL, NULL_TREE, gnu_type));
4305 TYPE_DUMMY_P (gnu_type) = 1;
4306 dummy_node_table[gnat_underlying] = gnu_type;
4311 /* Return 1 if the size represented by GNU_SIZE can be handled by an
4312 allocation. If STATIC_P is non-zero, consider only what can be
4313 done with a static allocation. */
4316 allocatable_size_p (tree gnu_size, int static_p)
4318 HOST_WIDE_INT our_size;
4320 /* If this is not a static allocation, the only case we want to forbid
4321 is an overflowing size. That will be converted into a raise a
4324 return ! (TREE_CODE (gnu_size) == INTEGER_CST
4325 && TREE_CONSTANT_OVERFLOW (gnu_size));
4327 /* Otherwise, we need to deal with both variable sizes and constant
4328 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
4329 since assemblers may not like very large sizes. */
4330 if (!host_integerp (gnu_size, 1))
4333 our_size = tree_low_cst (gnu_size, 1);
4334 return (int) our_size == our_size;
4337 /* Return a list of attributes for GNAT_ENTITY, if any. */
4339 static struct attrib *
4340 build_attr_list (Entity_Id gnat_entity)
4342 struct attrib *attr_list = 0;
4345 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
4346 gnat_temp = Next_Rep_Item (gnat_temp))
4347 if (Nkind (gnat_temp) == N_Pragma)
4349 struct attrib *attr;
4350 tree gnu_arg0 = 0, gnu_arg1 = 0;
4351 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
4352 enum attr_type etype;
4354 if (Present (gnat_assoc) && Present (First (gnat_assoc))
4355 && Present (Next (First (gnat_assoc)))
4356 && (Nkind (Expression (Next (First (gnat_assoc))))
4357 == N_String_Literal))
4359 gnu_arg0 = get_identifier (TREE_STRING_POINTER
4362 (First (gnat_assoc))))));
4363 if (Present (Next (Next (First (gnat_assoc))))
4364 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
4365 == N_String_Literal))
4366 gnu_arg1 = get_identifier (TREE_STRING_POINTER
4370 (First (gnat_assoc)))))));
4373 switch (Get_Pragma_Id (Chars (gnat_temp)))
4375 case Pragma_Machine_Attribute:
4376 etype = ATTR_MACHINE_ATTRIBUTE;
4379 case Pragma_Linker_Alias:
4380 etype = ATTR_LINK_ALIAS;
4383 case Pragma_Linker_Section:
4384 etype = ATTR_LINK_SECTION;
4387 case Pragma_Weak_External:
4388 etype = ATTR_WEAK_EXTERNAL;
4395 attr = (struct attrib *) xmalloc (sizeof (struct attrib));
4396 attr->next = attr_list;
4398 attr->name = gnu_arg0;
4399 attr->arg = gnu_arg1;
4401 = Present (Next (First (gnat_assoc)))
4402 ? Expression (Next (First (gnat_assoc))) : gnat_temp;
4409 /* Get the unpadded version of a GNAT type. */
4412 get_unpadded_type (Entity_Id gnat_entity)
4414 tree type = gnat_to_gnu_type (gnat_entity);
4416 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4417 type = TREE_TYPE (TYPE_FIELDS (type));
4422 /* Called when we need to protect a variable object using a save_expr. */
4425 maybe_variable (tree gnu_operand)
4427 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
4428 || TREE_CODE (gnu_operand) == SAVE_EXPR
4429 || TREE_CODE (gnu_operand) == NULL_EXPR)
4432 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
4434 tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF,
4435 TREE_TYPE (gnu_operand),
4436 variable_size (TREE_OPERAND (gnu_operand, 0)));
4438 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
4439 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
4443 return variable_size (gnu_operand);
4446 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
4447 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
4448 return the GCC tree to use for that expression. GNU_NAME is the
4449 qualification to use if an external name is appropriate and DEFINITION is
4450 nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero,
4451 we need a result. Otherwise, we are just elaborating this for
4452 side-effects. If NEED_DEBUG is nonzero we need the symbol for debugging
4453 purposes even if it isn't needed for code generation. */
4456 elaborate_expression (Node_Id gnat_expr,
4457 Entity_Id gnat_entity,
4465 /* If we already elaborated this expression (e.g., it was involved
4466 in the definition of a private type), use the old value. */
4467 if (present_gnu_tree (gnat_expr))
4468 return get_gnu_tree (gnat_expr);
4470 /* If we don't need a value and this is static or a discriment, we
4471 don't need to do anything. */
4472 else if (! need_value
4473 && (Is_OK_Static_Expression (gnat_expr)
4474 || (Nkind (gnat_expr) == N_Identifier
4475 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
4478 /* Otherwise, convert this tree to its GCC equivalant. */
4480 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
4481 gnu_name, definition, need_debug);
4483 /* Save the expression in case we try to elaborate this entity again.
4484 Since this is not a DECL, don't check it. If this is a constant,
4485 don't save it since GNAT_EXPR might be used more than once. Also,
4486 don't save if it's a discriminant. */
4487 if (! CONTAINS_PLACEHOLDER_P (gnu_expr))
4488 save_gnu_tree (gnat_expr, gnu_expr, 1);
4490 return need_value ? gnu_expr : error_mark_node;
4493 /* Similar, but take a GNU expression. */
4496 elaborate_expression_1 (Node_Id gnat_expr,
4497 Entity_Id gnat_entity,
4504 /* Strip any conversions to see if the expression is a readonly variable.
4505 ??? This really should remain readonly, but we have to think about
4506 the typing of the tree here. */
4507 tree gnu_inner_expr = remove_conversions (gnu_expr, 1);
4508 int expr_global = Is_Public (gnat_entity) || global_bindings_p ();
4511 /* In most cases, we won't see a naked FIELD_DECL here because a
4512 discriminant reference will have been replaced with a COMPONENT_REF
4513 when the type is being elaborated. However, there are some cases
4514 involving child types where we will. So convert it to a COMPONENT_REF
4515 here. We have to hope it will be at the highest level of the
4516 expression in these cases. */
4517 if (TREE_CODE (gnu_expr) == FIELD_DECL)
4518 gnu_expr = build (COMPONENT_REF, TREE_TYPE (gnu_expr),
4519 build (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
4522 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
4523 that is a constant, make a variable that is initialized to contain the
4524 bound when the package containing the definition is elaborated. If
4525 this entity is defined at top level and a bound or discriminant value
4526 isn't a constant or a reference to a discriminant, replace the bound
4527 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
4528 rely here on the fact that an expression cannot contain both the
4529 discriminant and some other variable. */
4531 expr_variable = (TREE_CODE_CLASS (TREE_CODE (gnu_expr)) != 'c'
4532 && ! (TREE_CODE (gnu_inner_expr) == VAR_DECL
4533 && TREE_READONLY (gnu_inner_expr))
4534 && ! CONTAINS_PLACEHOLDER_P (gnu_expr));
4536 /* If this is a static expression or contains a discriminant, we don't
4537 need the variable for debugging (and can't elaborate anyway if a
4540 && (Is_OK_Static_Expression (gnat_expr)
4541 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
4544 /* Now create the variable if we need it. */
4545 if (need_debug || (expr_variable && expr_global))
4548 = create_var_decl (create_concat_name (gnat_entity,
4549 IDENTIFIER_POINTER (gnu_name)),
4550 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, 1,
4551 Is_Public (gnat_entity), ! definition, 0, 0);
4552 annotate_decl_with_node (gnu_decl, gnat_entity);
4553 add_decl_stmt (gnu_decl, gnat_entity);
4556 /* We only need to use this variable if we are in global context since GCC
4557 can do the right thing in the local case. */
4558 if (expr_global && expr_variable)
4560 else if (! expr_variable)
4563 return maybe_variable (gnu_expr);
4566 /* Create a record type that contains a field of TYPE with a starting bit
4567 position so that it is aligned to ALIGN bits and is SIZE bytes long. */
4570 make_aligning_type (tree type, int align, tree size)
4572 tree record_type = make_node (RECORD_TYPE);
4573 tree place = build (PLACEHOLDER_EXPR, record_type);
4574 tree size_addr_place = convert (sizetype,
4575 build_unary_op (ADDR_EXPR, NULL_TREE,
4577 tree name = TYPE_NAME (type);
4580 if (TREE_CODE (name) == TYPE_DECL)
4581 name = DECL_NAME (name);
4583 TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN");
4585 /* The bit position is obtained by "and"ing the alignment minus 1
4586 with the two's complement of the address and multiplying
4587 by the number of bits per unit. Do all this in sizetype. */
4589 pos = size_binop (MULT_EXPR,
4590 convert (bitsizetype,
4591 size_binop (BIT_AND_EXPR,
4592 size_diffop (size_zero_node,
4594 ssize_int ((align / BITS_PER_UNIT)
4598 field = create_field_decl (get_identifier ("F"), type, record_type,
4600 DECL_BIT_FIELD (field) = 0;
4602 finish_record_type (record_type, field, 1, 0);
4603 TYPE_ALIGN (record_type) = BIGGEST_ALIGNMENT;
4604 TYPE_SIZE (record_type)
4605 = size_binop (PLUS_EXPR,
4606 size_binop (MULT_EXPR, convert (bitsizetype, size),
4608 bitsize_int (align));
4609 TYPE_SIZE_UNIT (record_type)
4610 = size_binop (PLUS_EXPR, size, size_int (align / BITS_PER_UNIT));
4611 copy_alias_set (record_type, type);
4615 /* TYPE is a RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE, with BLKmode that's
4616 being used as the field type of a packed record. See if we can rewrite it
4617 as a record that has a non-BLKmode type, which we can pack tighter. If so,
4618 return the new type. If not, return the original type. */
4621 make_packable_type (tree type)
4623 tree new_type = make_node (TREE_CODE (type));
4624 tree field_list = NULL_TREE;
4627 /* Copy the name and flags from the old type to that of the new and set
4628 the alignment to try for an integral type. For QUAL_UNION_TYPE,
4629 also copy the size. */
4630 TYPE_NAME (new_type) = TYPE_NAME (type);
4631 TYPE_LEFT_JUSTIFIED_MODULAR_P (new_type)
4632 = TYPE_LEFT_JUSTIFIED_MODULAR_P (type);
4633 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
4635 if (TREE_CODE (type) == RECORD_TYPE)
4636 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
4637 else if (TREE_CODE (type) == QUAL_UNION_TYPE)
4639 TYPE_SIZE (new_type) = TYPE_SIZE (type);
4640 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
4643 TYPE_ALIGN (new_type)
4644 = ((HOST_WIDE_INT) 1
4645 << (floor_log2 (tree_low_cst (TYPE_SIZE (type), 1) - 1) + 1));
4647 /* Now copy the fields, keeping the position and size. */
4648 for (old_field = TYPE_FIELDS (type); old_field != 0;
4649 old_field = TREE_CHAIN (old_field))
4651 tree new_field_type = TREE_TYPE (old_field);
4654 if (TYPE_MODE (new_field_type) == BLKmode
4655 && (TREE_CODE (new_field_type) == RECORD_TYPE
4656 || TREE_CODE (new_field_type) == UNION_TYPE
4657 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
4658 && host_integerp (TYPE_SIZE (new_field_type), 1))
4659 new_field_type = make_packable_type (new_field_type);
4661 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
4662 new_type, TYPE_PACKED (type),
4663 DECL_SIZE (old_field),
4664 bit_position (old_field),
4665 ! DECL_NONADDRESSABLE_P (old_field));
4667 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
4668 SET_DECL_ORIGINAL_FIELD
4669 (new_field, (DECL_ORIGINAL_FIELD (old_field) != 0
4670 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
4672 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
4673 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
4675 TREE_CHAIN (new_field) = field_list;
4676 field_list = new_field;
4679 finish_record_type (new_type, nreverse (field_list), 1, 1);
4680 copy_alias_set (new_type, type);
4681 return TYPE_MODE (new_type) == BLKmode ? type : new_type;
4684 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
4685 if needed. We have already verified that SIZE and TYPE are large enough.
4687 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
4690 IS_USER_TYPE is nonzero if we must be sure we complete the original type.
4692 DEFINITION is nonzero if this type is being defined.
4694 SAME_RM_SIZE is nonzero if the RM_Size of the resulting type is to be
4695 set to its TYPE_SIZE; otherwise, it's set to the RM_Size of the original
4699 maybe_pad_type (tree type, tree size, unsigned int align,
4700 Entity_Id gnat_entity, const char *name_trailer,
4701 int is_user_type, int definition, int same_rm_size)
4703 tree orig_size = TYPE_SIZE (type);
4707 /* If TYPE is a padded type, see if it agrees with any size and alignment
4708 we were given. If so, return the original type. Otherwise, strip
4709 off the padding, since we will either be returning the inner type
4710 or repadding it. If no size or alignment is specified, use that of
4711 the original padded type. */
4713 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4716 || operand_equal_p (round_up (size,
4717 MAX (align, TYPE_ALIGN (type))),
4718 round_up (TYPE_SIZE (type),
4719 MAX (align, TYPE_ALIGN (type))),
4721 && (align == 0 || align == TYPE_ALIGN (type)))
4725 size = TYPE_SIZE (type);
4727 align = TYPE_ALIGN (type);
4729 type = TREE_TYPE (TYPE_FIELDS (type));
4730 orig_size = TYPE_SIZE (type);
4733 /* If the size is either not being changed or is being made smaller (which
4734 is not done here (and is only valid for bitfields anyway), show the size
4735 isn't changing. Likewise, clear the alignment if it isn't being
4736 changed. Then return if we aren't doing anything. */
4739 && (operand_equal_p (size, orig_size, 0)
4740 || (TREE_CODE (orig_size) == INTEGER_CST
4741 && tree_int_cst_lt (size, orig_size))))
4744 if (align == TYPE_ALIGN (type))
4747 if (align == 0 && size == 0)
4750 /* We used to modify the record in place in some cases, but that could
4751 generate incorrect debugging information. So make a new record
4753 record = make_node (RECORD_TYPE);
4755 if (Present (gnat_entity))
4756 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
4758 /* If we were making a type, complete the original type and give it a
4761 create_type_decl (get_entity_name (gnat_entity), type,
4762 0, ! Comes_From_Source (gnat_entity),
4763 ! (TYPE_NAME (type) != 0
4764 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
4765 && DECL_IGNORED_P (TYPE_NAME (type))));
4767 /* If we are changing the alignment and the input type is a record with
4768 BLKmode and a small constant size, try to make a form that has an
4769 integral mode. That might allow this record to have an integral mode,
4770 which will be much more efficient. There is no point in doing this if a
4771 size is specified unless it is also smaller than the biggest alignment
4772 and it is incorrect to do this if the size of the original type is not a
4773 multiple of the alignment. */
4775 && TREE_CODE (type) == RECORD_TYPE
4776 && TYPE_MODE (type) == BLKmode
4777 && host_integerp (orig_size, 1)
4778 && compare_tree_int (orig_size, BIGGEST_ALIGNMENT) <= 0
4780 || (TREE_CODE (size) == INTEGER_CST
4781 && compare_tree_int (size, BIGGEST_ALIGNMENT) <= 0))
4782 && tree_low_cst (orig_size, 1) % align == 0)
4783 type = make_packable_type (type);
4785 field = create_field_decl (get_identifier ("F"), type, record, 0,
4786 NULL_TREE, bitsize_zero_node, 1);
4788 DECL_INTERNAL_P (field) = 1;
4789 TYPE_SIZE (record) = size != 0 ? size : orig_size;
4790 TYPE_SIZE_UNIT (record)
4791 = convert (sizetype,
4792 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
4793 bitsize_unit_node));
4794 TYPE_ALIGN (record) = align;
4795 TYPE_IS_PADDING_P (record) = 1;
4796 TYPE_VOLATILE (record)
4797 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
4798 finish_record_type (record, field, 1, 0);
4800 /* Keep the RM_Size of the padded record as that of the old record
4802 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : rm_size (type));
4804 /* Unless debugging information isn't being written for the input type,
4805 write a record that shows what we are a subtype of and also make a
4806 variable that indicates our size, if variable. */
4807 if (TYPE_NAME (record) != 0
4808 && AGGREGATE_TYPE_P (type)
4809 && (TREE_CODE (TYPE_NAME (type)) != TYPE_DECL
4810 || ! DECL_IGNORED_P (TYPE_NAME (type))))
4812 tree marker = make_node (RECORD_TYPE);
4813 tree name = DECL_NAME (TYPE_NAME (record));
4814 tree orig_name = TYPE_NAME (type);
4816 if (TREE_CODE (orig_name) == TYPE_DECL)
4817 orig_name = DECL_NAME (orig_name);
4819 TYPE_NAME (marker) = concat_id_with_name (name, "XVS");
4820 finish_record_type (marker,
4821 create_field_decl (orig_name, integer_type_node,
4822 marker, 0, NULL_TREE, NULL_TREE,
4826 if (size != 0 && TREE_CODE (size) != INTEGER_CST && definition)
4829 = create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE,
4830 sizetype, TYPE_SIZE (record), 0, 0, 0, 0, 0);
4832 add_decl_stmt (gnu_xvz, gnat_entity);
4838 if (CONTAINS_PLACEHOLDER_P (orig_size))
4839 orig_size = max_size (orig_size, 1);
4841 /* If the size was widened explicitly, maybe give a warning. */
4842 if (size != 0 && Present (gnat_entity)
4843 && ! operand_equal_p (size, orig_size, 0)
4844 && ! (TREE_CODE (size) == INTEGER_CST
4845 && TREE_CODE (orig_size) == INTEGER_CST
4846 && tree_int_cst_lt (size, orig_size)))
4848 Node_Id gnat_error_node = Empty;
4850 if (Is_Packed_Array_Type (gnat_entity))
4851 gnat_entity = Associated_Node_For_Itype (gnat_entity);
4853 if ((Ekind (gnat_entity) == E_Component
4854 || Ekind (gnat_entity) == E_Discriminant)
4855 && Present (Component_Clause (gnat_entity)))
4856 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
4857 else if (Present (Size_Clause (gnat_entity)))
4858 gnat_error_node = Expression (Size_Clause (gnat_entity));
4860 /* Generate message only for entities that come from source, since
4861 if we have an entity created by expansion, the message will be
4862 generated for some other corresponding source entity. */
4863 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
4864 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
4866 size_diffop (size, orig_size));
4868 else if (*name_trailer == 'C' && ! Is_Internal (gnat_entity))
4869 post_error_ne_tree ("component of& padded{ by ^ bits}?",
4870 gnat_entity, gnat_entity,
4871 size_diffop (size, orig_size));
4877 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
4878 the value passed against the list of choices. */
4881 choices_to_gnu (tree operand, Node_Id choices)
4885 tree result = integer_zero_node;
4886 tree this_test, low = 0, high = 0, single = 0;
4888 for (choice = First (choices); Present (choice); choice = Next (choice))
4890 switch (Nkind (choice))
4893 low = gnat_to_gnu (Low_Bound (choice));
4894 high = gnat_to_gnu (High_Bound (choice));
4896 /* There's no good type to use here, so we might as well use
4897 integer_type_node. */
4899 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4900 build_binary_op (GE_EXPR, integer_type_node,
4902 build_binary_op (LE_EXPR, integer_type_node,
4907 case N_Subtype_Indication:
4908 gnat_temp = Range_Expression (Constraint (choice));
4909 low = gnat_to_gnu (Low_Bound (gnat_temp));
4910 high = gnat_to_gnu (High_Bound (gnat_temp));
4913 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4914 build_binary_op (GE_EXPR, integer_type_node,
4916 build_binary_op (LE_EXPR, integer_type_node,
4921 case N_Expanded_Name:
4922 /* This represents either a subtype range, an enumeration
4923 literal, or a constant Ekind says which. If an enumeration
4924 literal or constant, fall through to the next case. */
4925 if (Ekind (Entity (choice)) != E_Enumeration_Literal
4926 && Ekind (Entity (choice)) != E_Constant)
4928 tree type = gnat_to_gnu_type (Entity (choice));
4930 low = TYPE_MIN_VALUE (type);
4931 high = TYPE_MAX_VALUE (type);
4934 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4935 build_binary_op (GE_EXPR, integer_type_node,
4937 build_binary_op (LE_EXPR, integer_type_node,
4941 /* ... fall through ... */
4942 case N_Character_Literal:
4943 case N_Integer_Literal:
4944 single = gnat_to_gnu (choice);
4945 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
4949 case N_Others_Choice:
4950 this_test = integer_one_node;
4957 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
4964 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
4965 placed in GNU_RECORD_TYPE.
4967 PACKED is 1 if the enclosing record is packed and -1 if the enclosing
4968 record has a Component_Alignment of Storage_Unit.
4970 DEFINITION is nonzero if this field is for a record being defined. */
4973 gnat_to_gnu_field (Entity_Id gnat_field,
4974 tree gnu_record_type,
4978 tree gnu_field_id = get_entity_name (gnat_field);
4979 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
4980 tree gnu_orig_field_type = gnu_field_type;
4984 int needs_strict_alignment
4985 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
4986 || Treat_As_Volatile (gnat_field));
4988 /* If this field requires strict alignment or contains an item of
4989 variable sized, pretend it isn't packed. */
4990 if (needs_strict_alignment || is_variable_size (gnu_field_type))
4993 /* For packed records, this is one of the few occasions on which we use
4994 the official RM size for discrete or fixed-point components, instead
4995 of the normal GNAT size stored in Esize. See description in Einfo:
4996 "Handling of Type'Size Values" for further details. */
4999 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
5000 gnat_field, FIELD_DECL, 0, 1);
5002 if (Known_Static_Esize (gnat_field))
5003 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
5004 gnat_field, FIELD_DECL, 0, 1);
5006 /* If the field's type is left-justified modular, the wrapper can prevent
5007 packing so we make the field the type of the inner object unless the
5008 situation forbids it. We may not do that when the field is addressable_p,
5009 typically because in that case this field may later be passed by-ref for
5010 a formal argument expecting the left justification. The condition below
5011 is then matching the addressable_p code for COMPONENT_REF. */
5012 if (! Is_Aliased (gnat_field) && flag_strict_aliasing
5013 && TREE_CODE (gnu_field_type) == RECORD_TYPE
5014 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_field_type))
5015 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
5017 /* If we are packing this record, have a specified size that's smaller than
5018 that of the field type, or a position is specified, and the field type
5019 is also a record that's BLKmode and with a small constant size, see if
5020 we can get a better form of the type that allows more packing. If we
5021 can, show a size was specified for it if there wasn't one so we know to
5022 make this a bitfield and avoid making things wider. */
5023 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5024 && TYPE_MODE (gnu_field_type) == BLKmode
5025 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
5026 && compare_tree_int (TYPE_SIZE (gnu_field_type), BIGGEST_ALIGNMENT) <= 0
5028 || (gnu_size != 0 && tree_int_cst_lt (gnu_size,
5029 TYPE_SIZE (gnu_field_type)))
5030 || Present (Component_Clause (gnat_field))))
5032 gnu_field_type = make_packable_type (gnu_field_type);
5034 if (gnu_field_type != gnu_orig_field_type && gnu_size == 0)
5035 gnu_size = rm_size (gnu_field_type);
5038 /* If we are packing the record and the field is BLKmode, round the
5039 size up to a byte boundary. */
5040 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size != 0)
5041 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
5043 if (Present (Component_Clause (gnat_field)))
5045 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
5046 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
5047 gnat_field, FIELD_DECL, 0, 1);
5049 /* Ensure the position does not overlap with the parent subtype,
5051 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
5054 = gnat_to_gnu_type (Parent_Subtype
5055 (Underlying_Type (Scope (gnat_field))));
5057 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
5058 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
5061 ("offset of& must be beyond parent{, minimum allowed is ^}",
5062 First_Bit (Component_Clause (gnat_field)), gnat_field,
5063 TYPE_SIZE_UNIT (gnu_parent));
5067 /* If this field needs strict alignment, ensure the record is
5068 sufficiently aligned and that that position and size are
5069 consistent with the alignment. */
5070 if (needs_strict_alignment)
5072 tree gnu_min_size = round_up (rm_size (gnu_field_type),
5073 TYPE_ALIGN (gnu_field_type));
5075 TYPE_ALIGN (gnu_record_type)
5076 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
5078 /* If Atomic, the size must match exactly and if aliased, the size
5079 must not be less than the rounded size. */
5080 if ((Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
5081 && ! operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
5084 ("atomic field& must be natural size of type{ (^)}",
5085 Last_Bit (Component_Clause (gnat_field)), gnat_field,
5086 TYPE_SIZE (gnu_field_type));
5091 else if (Is_Aliased (gnat_field)
5093 && tree_int_cst_lt (gnu_size, gnu_min_size))
5096 ("size of aliased field& too small{, minimum required is ^}",
5097 Last_Bit (Component_Clause (gnat_field)), gnat_field,
5102 if (! integer_zerop (size_binop
5103 (TRUNC_MOD_EXPR, gnu_pos,
5104 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
5106 if (Is_Aliased (gnat_field))
5108 ("position of aliased field& must be multiple of ^ bits",
5109 First_Bit (Component_Clause (gnat_field)), gnat_field,
5110 TYPE_ALIGN (gnu_field_type));
5112 else if (Treat_As_Volatile (gnat_field))
5114 ("position of volatile field& must be multiple of ^ bits",
5115 First_Bit (Component_Clause (gnat_field)), gnat_field,
5116 TYPE_ALIGN (gnu_field_type));
5118 else if (Strict_Alignment (Etype (gnat_field)))
5120 ("position of & with aliased or tagged components not multiple of ^ bits",
5121 First_Bit (Component_Clause (gnat_field)), gnat_field,
5122 TYPE_ALIGN (gnu_field_type));
5129 /* If an error set the size to zero, show we have no position
5135 if (Is_Atomic (gnat_field))
5136 check_ok_for_atomic (gnu_field_type, gnat_field, 0);
5139 /* If the record has rep clauses and this is the tag field, make a rep
5140 clause for it as well. */
5141 else if (Has_Specified_Layout (Scope (gnat_field))
5142 && Chars (gnat_field) == Name_uTag)
5144 gnu_pos = bitsize_zero_node;
5145 gnu_size = TYPE_SIZE (gnu_field_type);
5148 /* We need to make the size the maximum for the type if it is
5149 self-referential and an unconstrained type. In that case, we can't
5150 pack the field since we can't make a copy to align it. */
5151 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5153 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
5154 && ! Is_Constrained (Underlying_Type (Etype (gnat_field))))
5156 gnu_size = max_size (TYPE_SIZE (gnu_field_type), 1);
5160 /* If no size is specified (or if there was an error), don't specify a
5166 /* Unless this field is aliased, we can remove any left-justified
5167 modular type since it's only needed in the unchecked conversion
5168 case, which doesn't apply here. */
5169 if (! needs_strict_alignment
5170 && TREE_CODE (gnu_field_type) == RECORD_TYPE
5171 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_field_type))
5172 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
5175 = make_type_from_size (gnu_field_type, gnu_size,
5176 Has_Biased_Representation (gnat_field));
5177 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0,
5178 gnat_field, "PAD", 0, definition, 1);
5181 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5182 && TYPE_CONTAINS_TEMPLATE_P (gnu_field_type))
5185 /* Now create the decl for the field. */
5186 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
5187 packed, gnu_size, gnu_pos,
5188 Is_Aliased (gnat_field));
5189 annotate_decl_with_node (gnu_field, gnat_field);
5190 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
5192 if (Ekind (gnat_field) == E_Discriminant)
5193 DECL_DISCRIMINANT_NUMBER (gnu_field)
5194 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
5199 /* Return 1 if TYPE is a type with variable size, a padding type with a field
5200 of variable size or is a record that has a field such a field. */
5203 is_variable_size (tree type)
5207 /* We need not be concerned about this at all if we don't have
5208 strict alignment. */
5209 if (! STRICT_ALIGNMENT)
5211 else if (! TREE_CONSTANT (TYPE_SIZE (type)))
5213 else if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)
5214 && ! TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
5216 else if (TREE_CODE (type) != RECORD_TYPE
5217 && TREE_CODE (type) != UNION_TYPE
5218 && TREE_CODE (type) != QUAL_UNION_TYPE)
5221 for (field = TYPE_FIELDS (type); field != 0; field = TREE_CHAIN (field))
5222 if (is_variable_size (TREE_TYPE (field)))
5228 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
5229 of GCC trees for fields that are in the record and have already been
5230 processed. When called from gnat_to_gnu_entity during the processing of a
5231 record type definition, the GCC nodes for the discriminants will be on
5232 the chain. The other calls to this function are recursive calls from
5233 itself for the Component_List of a variant and the chain is empty.
5235 PACKED is 1 if this is for a record with "pragma pack" and -1 is this is
5236 for a record type with "pragma component_alignment (storage_unit)".
5238 FINISH_RECORD is nonzero if this call will supply all of the remaining
5239 fields of the record.
5241 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
5242 with a rep clause is to be added. If it is nonzero, that is all that
5243 should be done with such fields.
5245 CANCEL_ALIGNMENT, if nonzero, means the alignment should be zeroed
5246 before laying out the record. This means the alignment only serves
5247 to force fields to be bitfields, but not require the record to be
5248 that aligned. This is used for variants.
5250 ALL_REP, if nonzero, means that a rep clause was found for all the
5251 fields. This simplifies the logic since we know we're not in the mixed
5254 The processing of the component list fills in the chain with all of the
5255 fields of the record and then the record type is finished. */
5258 components_to_record (tree gnu_record_type,
5259 Node_Id component_list,
5260 tree gnu_field_list,
5263 tree *p_gnu_rep_list,
5264 int cancel_alignment,
5267 Node_Id component_decl;
5268 Entity_Id gnat_field;
5269 Node_Id variant_part;
5271 tree gnu_our_rep_list = NULL_TREE;
5272 tree gnu_field, gnu_last;
5273 int layout_with_rep = 0;
5274 int all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type) != 0;
5276 /* For each variable within each component declaration create a GCC field
5277 and add it to the list, skipping any pragmas in the list. */
5279 if (Present (Component_Items (component_list)))
5280 for (component_decl = First_Non_Pragma (Component_Items (component_list));
5281 Present (component_decl);
5282 component_decl = Next_Non_Pragma (component_decl))
5284 gnat_field = Defining_Entity (component_decl);
5286 if (Chars (gnat_field) == Name_uParent)
5287 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
5290 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
5291 packed, definition);
5293 /* If this is the _Tag field, put it before any discriminants,
5294 instead of after them as is the case for all other fields.
5295 Ignore field of void type if only annotating. */
5296 if (Chars (gnat_field) == Name_uTag)
5297 gnu_field_list = chainon (gnu_field_list, gnu_field);
5300 TREE_CHAIN (gnu_field) = gnu_field_list;
5301 gnu_field_list = gnu_field;
5305 save_gnu_tree (gnat_field, gnu_field, 0);
5308 /* At the end of the component list there may be a variant part. */
5309 variant_part = Variant_Part (component_list);
5311 /* If this is an unchecked union, each variant must have exactly one
5312 component, each of which becomes one component of this union. */
5313 if (TREE_CODE (gnu_record_type) == UNION_TYPE && Present (variant_part))
5314 for (variant = First_Non_Pragma (Variants (variant_part));
5316 variant = Next_Non_Pragma (variant))
5319 = First_Non_Pragma (Component_Items (Component_List (variant)));
5320 gnat_field = Defining_Entity (component_decl);
5321 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
5323 TREE_CHAIN (gnu_field) = gnu_field_list;
5324 gnu_field_list = gnu_field;
5325 save_gnu_tree (gnat_field, gnu_field, 0);
5328 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
5329 mutually exclusive and should go in the same memory. To do this we need
5330 to treat each variant as a record whose elements are created from the
5331 component list for the variant. So here we create the records from the
5332 lists for the variants and put them all into the QUAL_UNION_TYPE. */
5333 else if (Present (variant_part))
5335 tree gnu_discriminant = gnat_to_gnu (Name (variant_part));
5337 tree gnu_union_type = make_node (QUAL_UNION_TYPE);
5338 tree gnu_union_field;
5339 tree gnu_variant_list = NULL_TREE;
5340 tree gnu_name = TYPE_NAME (gnu_record_type);
5342 = concat_id_with_name
5343 (get_identifier (Get_Name_String (Chars (Name (variant_part)))),
5346 if (TREE_CODE (gnu_name) == TYPE_DECL)
5347 gnu_name = DECL_NAME (gnu_name);
5349 TYPE_NAME (gnu_union_type)
5350 = concat_id_with_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
5351 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
5353 for (variant = First_Non_Pragma (Variants (variant_part));
5355 variant = Next_Non_Pragma (variant))
5357 tree gnu_variant_type = make_node (RECORD_TYPE);
5358 tree gnu_inner_name;
5361 Get_Variant_Encoding (variant);
5362 gnu_inner_name = get_identifier (Name_Buffer);
5363 TYPE_NAME (gnu_variant_type)
5364 = concat_id_with_name (TYPE_NAME (gnu_union_type),
5365 IDENTIFIER_POINTER (gnu_inner_name));
5367 /* Set the alignment of the inner type in case we need to make
5368 inner objects into bitfields, but then clear it out
5369 so the record actually gets only the alignment required. */
5370 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
5371 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
5373 /* Similarly, if the outer record has a size specified and all fields
5374 have record rep clauses, we can propagate the size into the
5376 if (all_rep_and_size)
5378 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
5379 TYPE_SIZE_UNIT (gnu_variant_type)
5380 = TYPE_SIZE_UNIT (gnu_record_type);
5383 components_to_record (gnu_variant_type, Component_List (variant),
5384 NULL_TREE, packed, definition,
5385 &gnu_our_rep_list, !all_rep_and_size, all_rep);
5387 gnu_qual = choices_to_gnu (gnu_discriminant,
5388 Discrete_Choices (variant));
5390 Set_Present_Expr (variant, annotate_value (gnu_qual));
5391 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
5394 ? TYPE_SIZE (gnu_record_type) : 0),
5396 ? bitsize_zero_node : 0),
5399 DECL_INTERNAL_P (gnu_field) = 1;
5400 DECL_QUALIFIER (gnu_field) = gnu_qual;
5401 TREE_CHAIN (gnu_field) = gnu_variant_list;
5402 gnu_variant_list = gnu_field;
5405 /* We use to delete the empty variants from the end. However,
5406 we no longer do that because we need them to generate complete
5407 debugging information for the variant record. Otherwise,
5408 the union type definition will be missing the fields associated
5409 to these empty variants. */
5411 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
5412 if (gnu_variant_list != 0)
5414 if (all_rep_and_size)
5416 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
5417 TYPE_SIZE_UNIT (gnu_union_type)
5418 = TYPE_SIZE_UNIT (gnu_record_type);
5421 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
5422 all_rep_and_size, 0);
5425 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
5427 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
5428 all_rep ? bitsize_zero_node : 0, 0);
5430 DECL_INTERNAL_P (gnu_union_field) = 1;
5431 TREE_CHAIN (gnu_union_field) = gnu_field_list;
5432 gnu_field_list = gnu_union_field;
5436 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
5437 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
5438 in a separate pass since we want to handle the discriminants but can't
5439 play with them until we've used them in debugging data above.
5441 ??? Note: if we then reorder them, debugging information will be wrong,
5442 but there's nothing that can be done about this at the moment. */
5444 for (gnu_field = gnu_field_list, gnu_last = 0; gnu_field; )
5446 if (DECL_FIELD_OFFSET (gnu_field) != 0)
5448 tree gnu_next = TREE_CHAIN (gnu_field);
5451 gnu_field_list = gnu_next;
5453 TREE_CHAIN (gnu_last) = gnu_next;
5455 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
5456 gnu_our_rep_list = gnu_field;
5457 gnu_field = gnu_next;
5461 gnu_last = gnu_field;
5462 gnu_field = TREE_CHAIN (gnu_field);
5466 /* If we have any items in our rep'ed field list, it is not the case that all
5467 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
5468 set it and ignore the items. Otherwise, sort the fields by bit position
5469 and put them into their own record if we have any fields without
5471 if (gnu_our_rep_list != 0 && p_gnu_rep_list != 0 && ! all_rep)
5472 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
5473 else if (gnu_our_rep_list != 0)
5476 = gnu_field_list == 0 ? gnu_record_type : make_node (RECORD_TYPE);
5477 int len = list_length (gnu_our_rep_list);
5478 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
5481 /* Set DECL_SECTION_NAME to increasing integers so we have a
5483 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
5484 gnu_field = TREE_CHAIN (gnu_field), i++)
5486 gnu_arr[i] = gnu_field;
5487 DECL_SECTION_NAME (gnu_field) = size_int (i);
5490 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
5492 /* Put the fields in the list in order of increasing position, which
5493 means we start from the end. */
5494 gnu_our_rep_list = NULL_TREE;
5495 for (i = len - 1; i >= 0; i--)
5497 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
5498 gnu_our_rep_list = gnu_arr[i];
5499 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
5500 DECL_SECTION_NAME (gnu_arr[i]) = 0;
5503 if (gnu_field_list != 0)
5505 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, 0);
5506 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
5507 gnu_record_type, 0, 0, 0, 1);
5508 DECL_INTERNAL_P (gnu_field) = 1;
5509 gnu_field_list = chainon (gnu_field_list, gnu_field);
5513 layout_with_rep = 1;
5514 gnu_field_list = nreverse (gnu_our_rep_list);
5518 if (cancel_alignment)
5519 TYPE_ALIGN (gnu_record_type) = 0;
5521 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
5522 layout_with_rep, 0);
5525 /* Called via qsort from the above. Returns -1, 1, depending on the
5526 bit positions and ordinals of the two fields. */
5529 compare_field_bitpos (const PTR rt1, const PTR rt2)
5531 tree *t1 = (tree *) rt1;
5532 tree *t2 = (tree *) rt2;
5534 if (tree_int_cst_equal (bit_position (*t1), bit_position (*t2)))
5536 (tree_int_cst_lt (DECL_SECTION_NAME (*t1), DECL_SECTION_NAME (*t2))
5538 else if (tree_int_cst_lt (bit_position (*t1), bit_position (*t2)))
5544 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
5545 placed into an Esize, Component_Bit_Offset, or Component_Size value
5546 in the GNAT tree. */
5549 annotate_value (tree gnu_size)
5551 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
5553 Node_Ref_Or_Val ops[3], ret;
5557 /* If back annotation is suppressed by the front end, return No_Uint */
5558 if (!Back_Annotate_Rep_Info)
5561 /* See if we've already saved the value for this node. */
5562 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (gnu_size)))
5563 && TREE_COMPLEXITY (gnu_size) != 0)
5564 return (Node_Ref_Or_Val) TREE_COMPLEXITY (gnu_size);
5566 /* If we do not return inside this switch, TCODE will be set to the
5567 code to use for a Create_Node operand and LEN (set above) will be
5568 the number of recursive calls for us to make. */
5570 switch (TREE_CODE (gnu_size))
5573 if (TREE_OVERFLOW (gnu_size))
5576 /* This may have come from a conversion from some smaller type,
5577 so ensure this is in bitsizetype. */
5578 gnu_size = convert (bitsizetype, gnu_size);
5580 /* For negative values, use NEGATE_EXPR of the supplied value. */
5581 if (tree_int_cst_sgn (gnu_size) < 0)
5583 /* The rediculous code below is to handle the case of the largest
5584 negative integer. */
5585 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
5589 if (TREE_CONSTANT_OVERFLOW (negative_size))
5592 = size_binop (MINUS_EXPR, bitsize_zero_node,
5593 size_binop (PLUS_EXPR, gnu_size,
5598 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
5600 temp = build (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
5602 return annotate_value (temp);
5605 if (! host_integerp (gnu_size, 1))
5608 size = tree_low_cst (gnu_size, 1);
5610 /* This peculiar test is to make sure that the size fits in an int
5611 on machines where HOST_WIDE_INT is not "int". */
5612 if (tree_low_cst (gnu_size, 1) == size)
5613 return UI_From_Int (size);
5618 /* The only case we handle here is a simple discriminant reference. */
5619 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
5620 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
5621 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)) != 0)
5622 return Create_Node (Discrim_Val,
5623 annotate_value (DECL_DISCRIMINANT_NUMBER
5624 (TREE_OPERAND (gnu_size, 1))),
5629 case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
5630 return annotate_value (TREE_OPERAND (gnu_size, 0));
5632 /* Now just list the operations we handle. */
5633 case COND_EXPR: tcode = Cond_Expr; break;
5634 case PLUS_EXPR: tcode = Plus_Expr; break;
5635 case MINUS_EXPR: tcode = Minus_Expr; break;
5636 case MULT_EXPR: tcode = Mult_Expr; break;
5637 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
5638 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
5639 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
5640 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
5641 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
5642 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
5643 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
5644 case NEGATE_EXPR: tcode = Negate_Expr; break;
5645 case MIN_EXPR: tcode = Min_Expr; break;
5646 case MAX_EXPR: tcode = Max_Expr; break;
5647 case ABS_EXPR: tcode = Abs_Expr; break;
5648 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
5649 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
5650 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
5651 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
5652 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
5653 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
5654 case LT_EXPR: tcode = Lt_Expr; break;
5655 case LE_EXPR: tcode = Le_Expr; break;
5656 case GT_EXPR: tcode = Gt_Expr; break;
5657 case GE_EXPR: tcode = Ge_Expr; break;
5658 case EQ_EXPR: tcode = Eq_Expr; break;
5659 case NE_EXPR: tcode = Ne_Expr; break;
5665 /* Now get each of the operands that's relevant for this code. If any
5666 cannot be expressed as a repinfo node, say we can't. */
5667 for (i = 0; i < 3; i++)
5670 for (i = 0; i < len; i++)
5672 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
5673 if (ops[i] == No_Uint)
5677 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
5678 TREE_COMPLEXITY (gnu_size) = ret;
5682 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
5683 GCC type, set Component_Bit_Offset and Esize to the position and size
5687 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
5691 Entity_Id gnat_field;
5693 /* We operate by first making a list of all field and their positions
5694 (we can get the sizes easily at any time) by a recursive call
5695 and then update all the sizes into the tree. */
5696 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
5697 size_zero_node, bitsize_zero_node,
5700 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
5701 gnat_field = Next_Entity (gnat_field))
5702 if ((Ekind (gnat_field) == E_Component
5703 || (Ekind (gnat_field) == E_Discriminant
5704 && ! Is_Unchecked_Union (Scope (gnat_field)))))
5706 tree parent_offset = bitsize_zero_node;
5709 = purpose_member (gnat_to_gnu_entity (gnat_field, NULL_TREE, 0),
5714 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
5716 /* In this mode the tag and parent components have not been
5717 generated, so we add the appropriate offset to each
5718 component. For a component appearing in the current
5719 extension, the offset is the size of the parent. */
5720 if (Is_Derived_Type (gnat_entity)
5721 && Original_Record_Component (gnat_field) == gnat_field)
5723 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
5726 parent_offset = bitsize_int (POINTER_SIZE);
5729 Set_Component_Bit_Offset
5732 (size_binop (PLUS_EXPR,
5733 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
5734 TREE_VALUE (TREE_VALUE
5735 (TREE_VALUE (gnu_entry)))),
5738 Set_Esize (gnat_field,
5739 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
5741 else if (type_annotate_only
5742 && Is_Tagged_Type (gnat_entity)
5743 && Is_Derived_Type (gnat_entity))
5745 /* If there is no gnu_entry, this is an inherited component whose
5746 position is the same as in the parent type. */
5747 Set_Component_Bit_Offset
5749 Component_Bit_Offset (Original_Record_Component (gnat_field)));
5750 Set_Esize (gnat_field,
5751 Esize (Original_Record_Component (gnat_field)));
5756 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
5757 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
5758 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
5759 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
5760 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
5761 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
5765 compute_field_positions (tree gnu_type,
5769 unsigned int offset_align)
5772 tree gnu_result = gnu_list;
5774 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
5775 gnu_field = TREE_CHAIN (gnu_field))
5777 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
5778 DECL_FIELD_BIT_OFFSET (gnu_field));
5779 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
5780 DECL_FIELD_OFFSET (gnu_field));
5781 unsigned int our_offset_align
5782 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
5785 = tree_cons (gnu_field,
5786 tree_cons (gnu_our_offset,
5787 tree_cons (size_int (our_offset_align),
5788 gnu_our_bitpos, NULL_TREE),
5792 if (DECL_INTERNAL_P (gnu_field))
5794 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
5795 gnu_our_offset, gnu_our_bitpos,
5802 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
5803 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
5804 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
5805 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
5806 for the size of a field. COMPONENT_P is true if we are being called
5807 to process the Component_Size of GNAT_OBJECT. This is used for error
5808 message handling and to indicate to use the object size of GNU_TYPE.
5809 ZERO_OK is nonzero if a size of zero is permitted; if ZERO_OK is zero,
5810 it means that a size of zero should be treated as an unspecified size. */
5813 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
5814 enum tree_code kind, int component_p, int zero_ok)
5816 Node_Id gnat_error_node;
5818 = kind == VAR_DECL ? TYPE_SIZE (gnu_type) : rm_size (gnu_type);
5821 /* Find the node to use for errors. */
5822 if ((Ekind (gnat_object) == E_Component
5823 || Ekind (gnat_object) == E_Discriminant)
5824 && Present (Component_Clause (gnat_object)))
5825 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
5826 else if (Present (Size_Clause (gnat_object)))
5827 gnat_error_node = Expression (Size_Clause (gnat_object));
5829 gnat_error_node = gnat_object;
5831 /* Return 0 if no size was specified, either because Esize was not Present or
5832 the specified size was zero. */
5833 if (No (uint_size) || uint_size == No_Uint)
5836 /* Get the size as a tree. Give an error if a size was specified, but cannot
5837 be represented as in sizetype. */
5838 size = UI_To_gnu (uint_size, bitsizetype);
5839 if (TREE_OVERFLOW (size))
5841 post_error_ne (component_p ? "component size of & is too large"
5842 : "size of & is too large",
5843 gnat_error_node, gnat_object);
5846 /* Ignore a negative size since that corresponds to our back-annotation.
5847 Also ignore a zero size unless a size clause exists. */
5848 else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && ! zero_ok))
5851 /* The size of objects is always a multiple of a byte. */
5852 if (kind == VAR_DECL
5853 && ! integer_zerop (size_binop (TRUNC_MOD_EXPR, size,
5854 bitsize_unit_node)))
5857 post_error_ne ("component size for& is not a multiple of Storage_Unit",
5858 gnat_error_node, gnat_object);
5860 post_error_ne ("size for& is not a multiple of Storage_Unit",
5861 gnat_error_node, gnat_object);
5865 /* If this is an integral type or a packed array type, the front-end has
5866 verified the size, so we need not do it here (which would entail
5867 checking against the bounds). However, if this is an aliased object, it
5868 may not be smaller than the type of the object. */
5869 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
5870 && ! (kind == VAR_DECL && Is_Aliased (gnat_object)))
5873 /* If the object is a record that contains a template, add the size of
5874 the template to the specified size. */
5875 if (TREE_CODE (gnu_type) == RECORD_TYPE
5876 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
5877 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
5879 /* Modify the size of the type to be that of the maximum size if it has a
5880 discriminant or the size of a thin pointer if this is a fat pointer. */
5881 if (type_size != 0 && CONTAINS_PLACEHOLDER_P (type_size))
5882 type_size = max_size (type_size, 1);
5883 else if (TYPE_FAT_POINTER_P (gnu_type))
5884 type_size = bitsize_int (POINTER_SIZE);
5886 /* If this is an access type, the minimum size is that given by the smallest
5887 integral mode that's valid for pointers. */
5888 if (TREE_CODE (gnu_type) == POINTER_TYPE)
5890 enum machine_mode p_mode;
5892 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
5893 !targetm.valid_pointer_mode (p_mode);
5894 p_mode = GET_MODE_WIDER_MODE (p_mode))
5897 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
5900 /* If the size of the object is a constant, the new size must not be
5902 if (TREE_CODE (type_size) != INTEGER_CST
5903 || TREE_OVERFLOW (type_size)
5904 || tree_int_cst_lt (size, type_size))
5908 ("component size for& too small{, minimum allowed is ^}",
5909 gnat_error_node, gnat_object, type_size);
5911 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
5912 gnat_error_node, gnat_object, type_size);
5914 if (kind == VAR_DECL && ! component_p
5915 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
5916 && ! tree_int_cst_lt (size, rm_size (gnu_type)))
5917 post_error_ne_tree_2
5918 ("\\size of ^ is not a multiple of alignment (^ bits)",
5919 gnat_error_node, gnat_object, rm_size (gnu_type),
5920 TYPE_ALIGN (gnu_type));
5922 else if (INTEGRAL_TYPE_P (gnu_type))
5923 post_error_ne ("\\size would be legal if & were not aliased!",
5924 gnat_error_node, gnat_object);
5932 /* Similarly, but both validate and process a value of RM_Size. This
5933 routine is only called for types. */
5936 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
5938 /* Only give an error if a Value_Size clause was explicitly given.
5939 Otherwise, we'd be duplicating an error on the Size clause. */
5940 Node_Id gnat_attr_node
5941 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
5942 tree old_size = rm_size (gnu_type);
5945 /* Get the size as a tree. Do nothing if none was specified, either
5946 because RM_Size was not Present or if the specified size was zero.
5947 Give an error if a size was specified, but cannot be represented as
5949 if (No (uint_size) || uint_size == No_Uint)
5952 size = UI_To_gnu (uint_size, bitsizetype);
5953 if (TREE_OVERFLOW (size))
5955 if (Present (gnat_attr_node))
5956 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
5962 /* Ignore a negative size since that corresponds to our back-annotation.
5963 Also ignore a zero size unless a size clause exists, a Value_Size
5964 clause exists, or this is an integer type, in which case the
5965 front end will have always set it. */
5966 else if (tree_int_cst_sgn (size) < 0
5967 || (integer_zerop (size) && No (gnat_attr_node)
5968 && ! Has_Size_Clause (gnat_entity)
5969 && ! Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
5972 /* If the old size is self-referential, get the maximum size. */
5973 if (CONTAINS_PLACEHOLDER_P (old_size))
5974 old_size = max_size (old_size, 1);
5976 /* If the size of the object is a constant, the new size must not be
5977 smaller (the front end checks this for scalar types). */
5978 if (TREE_CODE (old_size) != INTEGER_CST
5979 || TREE_OVERFLOW (old_size)
5980 || (AGGREGATE_TYPE_P (gnu_type)
5981 && tree_int_cst_lt (size, old_size)))
5983 if (Present (gnat_attr_node))
5985 ("Value_Size for& too small{, minimum allowed is ^}",
5986 gnat_attr_node, gnat_entity, old_size);
5991 /* Otherwise, set the RM_Size. */
5992 if (TREE_CODE (gnu_type) == INTEGER_TYPE
5993 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
5994 TYPE_RM_SIZE_INT (gnu_type) = size;
5995 else if (TREE_CODE (gnu_type) == ENUMERAL_TYPE)
5996 SET_TYPE_RM_SIZE_ENUM (gnu_type, size);
5997 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
5998 || TREE_CODE (gnu_type) == UNION_TYPE
5999 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
6000 && ! TYPE_IS_FAT_POINTER_P (gnu_type))
6001 SET_TYPE_ADA_SIZE (gnu_type, size);
6004 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
6005 If TYPE is the best type, return it. Otherwise, make a new type. We
6006 only support new integral and pointer types. BIASED_P is nonzero if
6007 we are making a biased type. */
6010 make_type_from_size (tree type, tree size_tree, int biased_p)
6013 unsigned HOST_WIDE_INT size;
6015 /* If size indicates an error, just return TYPE to avoid propagating the
6016 error. Likewise if it's too large to represent. */
6017 if (size_tree == 0 || ! host_integerp (size_tree, 1))
6020 size = tree_low_cst (size_tree, 1);
6021 switch (TREE_CODE (type))
6025 /* Only do something if the type is not already the proper size and is
6026 not a packed array type. */
6027 if (TYPE_PACKED_ARRAY_TYPE_P (type)
6028 || (TYPE_PRECISION (type) == size
6029 && biased_p == (TREE_CODE (type) == INTEGER_CST
6030 && TYPE_BIASED_REPRESENTATION_P (type))))
6033 size = MIN (size, LONG_LONG_TYPE_SIZE);
6034 new_type = make_signed_type (size);
6035 TREE_TYPE (new_type)
6036 = TREE_TYPE (type) != 0 ? TREE_TYPE (type) : type;
6037 TYPE_MIN_VALUE (new_type)
6038 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
6039 TYPE_MAX_VALUE (new_type)
6040 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
6041 TYPE_BIASED_REPRESENTATION_P (new_type)
6042 = ((TREE_CODE (type) == INTEGER_TYPE
6043 && TYPE_BIASED_REPRESENTATION_P (type))
6045 TYPE_UNSIGNED (new_type)
6046 = TYPE_UNSIGNED (type) | TYPE_BIASED_REPRESENTATION_P (new_type);
6047 TYPE_RM_SIZE_INT (new_type) = bitsize_int (size);
6051 /* Do something if this is a fat pointer, in which case we
6052 may need to return the thin pointer. */
6053 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
6056 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)));
6060 /* Only do something if this is a thin pointer, in which case we
6061 may need to return the fat pointer. */
6062 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
6064 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
6075 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
6076 a type or object whose present alignment is ALIGN. If this alignment is
6077 valid, return it. Otherwise, give an error and return ALIGN. */
6080 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
6082 Node_Id gnat_error_node = gnat_entity;
6083 unsigned int new_align;
6085 #ifndef MAX_OFILE_ALIGNMENT
6086 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
6089 if (Present (Alignment_Clause (gnat_entity)))
6090 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
6092 /* Don't worry about checking alignment if alignment was not specified
6093 by the source program and we already posted an error for this entity. */
6095 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
6098 /* Within GCC, an alignment is an integer, so we must make sure a
6099 value is specified that fits in that range. Also, alignments of
6100 more than MAX_OFILE_ALIGNMENT can't be supported. */
6102 if (! UI_Is_In_Int_Range (alignment)
6103 || ((new_align = UI_To_Int (alignment))
6104 > MAX_OFILE_ALIGNMENT / BITS_PER_UNIT))
6105 post_error_ne_num ("largest supported alignment for& is ^",
6106 gnat_error_node, gnat_entity,
6107 MAX_OFILE_ALIGNMENT / BITS_PER_UNIT);
6108 else if (! (Present (Alignment_Clause (gnat_entity))
6109 && From_At_Mod (Alignment_Clause (gnat_entity)))
6110 && new_align * BITS_PER_UNIT < align)
6111 post_error_ne_num ("alignment for& must be at least ^",
6112 gnat_error_node, gnat_entity,
6113 align / BITS_PER_UNIT);
6115 align = MAX (align, new_align == 0 ? 1 : new_align * BITS_PER_UNIT);
6120 /* Verify that OBJECT, a type or decl, is something we can implement
6121 atomically. If not, give an error for GNAT_ENTITY. COMP_P is nonzero
6122 if we require atomic components. */
6125 check_ok_for_atomic (tree object, Entity_Id gnat_entity, int comp_p)
6127 Node_Id gnat_error_point = gnat_entity;
6129 enum machine_mode mode;
6133 /* There are three case of what OBJECT can be. It can be a type, in which
6134 case we take the size, alignment and mode from the type. It can be a
6135 declaration that was indirect, in which case the relevant values are
6136 that of the type being pointed to, or it can be a normal declaration,
6137 in which case the values are of the decl. The code below assumes that
6138 OBJECT is either a type or a decl. */
6139 if (TYPE_P (object))
6141 mode = TYPE_MODE (object);
6142 align = TYPE_ALIGN (object);
6143 size = TYPE_SIZE (object);
6145 else if (DECL_BY_REF_P (object))
6147 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
6148 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
6149 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
6153 mode = DECL_MODE (object);
6154 align = DECL_ALIGN (object);
6155 size = DECL_SIZE (object);
6158 /* Consider all floating-point types atomic and any types that that are
6159 represented by integers no wider than a machine word. */
6160 if (GET_MODE_CLASS (mode) == MODE_FLOAT
6161 || ((GET_MODE_CLASS (mode) == MODE_INT
6162 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
6163 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
6166 /* For the moment, also allow anything that has an alignment equal
6167 to its size and which is smaller than a word. */
6168 if (size != 0 && TREE_CODE (size) == INTEGER_CST
6169 && compare_tree_int (size, align) == 0
6170 && align <= BITS_PER_WORD)
6173 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
6174 gnat_node = Next_Rep_Item (gnat_node))
6176 if (! comp_p && Nkind (gnat_node) == N_Pragma
6177 && Get_Pragma_Id (Chars (gnat_node)) == Pragma_Atomic)
6178 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
6179 else if (comp_p && Nkind (gnat_node) == N_Pragma
6180 && (Get_Pragma_Id (Chars (gnat_node))
6181 == Pragma_Atomic_Components))
6182 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
6186 post_error_ne ("atomic access to component of & cannot be guaranteed",
6187 gnat_error_point, gnat_entity);
6189 post_error_ne ("atomic access to & cannot be guaranteed",
6190 gnat_error_point, gnat_entity);
6193 /* Set the DECL_SOURCE_LOCATION of GNU_DECL to the location of
6197 annotate_decl_with_node (tree gnu_decl, Node_Id gnat_node)
6199 Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (gnu_decl));
6202 /* Given a type T, a FIELD_DECL F, and a replacement value R,
6203 return a new type with all size expressions that contain F
6204 updated by replacing F with R. This is identical to GCC's
6205 substitute_in_type except that it knows about TYPE_INDEX_TYPE.
6206 If F is NULL_TREE, always make a new RECORD_TYPE, even if nothing has
6210 gnat_substitute_in_type (tree t, tree f, tree r)
6215 switch (TREE_CODE (t))
6221 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
6222 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
6224 tree low = substitute_in_expr (TYPE_MIN_VALUE (t), f, r);
6225 tree high = substitute_in_expr (TYPE_MAX_VALUE (t), f, r);
6227 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
6230 new = build_range_type (TREE_TYPE (t), low, high);
6231 if (TYPE_INDEX_TYPE (t))
6233 (new, gnat_substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
6240 if ((TYPE_MIN_VALUE (t) != 0
6241 && CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t)))
6242 || (TYPE_MAX_VALUE (t) != 0
6243 && CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t))))
6245 tree low = 0, high = 0;
6247 if (TYPE_MIN_VALUE (t))
6248 low = substitute_in_expr (TYPE_MIN_VALUE (t), f, r);
6249 if (TYPE_MAX_VALUE (t))
6250 high = substitute_in_expr (TYPE_MAX_VALUE (t), f, r);
6252 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
6256 TYPE_MIN_VALUE (t) = low;
6257 TYPE_MAX_VALUE (t) = high;
6262 tem = gnat_substitute_in_type (TREE_TYPE (t), f, r);
6263 if (tem == TREE_TYPE (t))
6266 return build_complex_type (tem);
6274 /* Don't know how to do these yet. */
6279 tree component = gnat_substitute_in_type (TREE_TYPE (t), f, r);
6280 tree domain = gnat_substitute_in_type (TYPE_DOMAIN (t), f, r);
6282 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
6285 new = build_array_type (component, domain);
6286 TYPE_SIZE (new) = 0;
6287 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
6288 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
6290 TYPE_ALIGN (new) = TYPE_ALIGN (t);
6296 case QUAL_UNION_TYPE:
6300 = (f == NULL_TREE && ! TREE_CONSTANT (TYPE_SIZE (t)));
6301 int field_has_rep = 0;
6302 tree last_field = 0;
6304 tree new = copy_type (t);
6306 /* Start out with no fields, make new fields, and chain them
6307 in. If we haven't actually changed the type of any field,
6308 discard everything we've done and return the old type. */
6310 TYPE_FIELDS (new) = 0;
6311 TYPE_SIZE (new) = 0;
6313 for (field = TYPE_FIELDS (t); field;
6314 field = TREE_CHAIN (field))
6316 tree new_field = copy_node (field);
6318 TREE_TYPE (new_field)
6319 = gnat_substitute_in_type (TREE_TYPE (new_field), f, r);
6321 if (DECL_HAS_REP_P (field) && ! DECL_INTERNAL_P (field))
6323 else if (TREE_TYPE (new_field) != TREE_TYPE (field))
6326 /* If this is an internal field and the type of this field is
6327 a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If
6328 the type just has one element, treat that as the field.
6329 But don't do this if we are processing a QUAL_UNION_TYPE. */
6330 if (TREE_CODE (t) != QUAL_UNION_TYPE
6331 && DECL_INTERNAL_P (new_field)
6332 && (TREE_CODE (TREE_TYPE (new_field)) == UNION_TYPE
6333 || TREE_CODE (TREE_TYPE (new_field)) == RECORD_TYPE))
6335 if (TYPE_FIELDS (TREE_TYPE (new_field)) == 0)
6338 if (TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field))) == 0)
6341 = copy_node (TYPE_FIELDS (TREE_TYPE (new_field)));
6343 /* Make sure omitting the union doesn't change
6345 DECL_ALIGN (next_new_field) = DECL_ALIGN (new_field);
6346 new_field = next_new_field;
6350 DECL_CONTEXT (new_field) = new;
6351 SET_DECL_ORIGINAL_FIELD (new_field,
6352 (DECL_ORIGINAL_FIELD (field) != 0
6353 ? DECL_ORIGINAL_FIELD (field) : field));
6355 /* If the size of the old field was set at a constant,
6356 propagate the size in case the type's size was variable.
6357 (This occurs in the case of a variant or discriminated
6358 record with a default size used as a field of another
6360 DECL_SIZE (new_field)
6361 = TREE_CODE (DECL_SIZE (field)) == INTEGER_CST
6362 ? DECL_SIZE (field) : 0;
6363 DECL_SIZE_UNIT (new_field)
6364 = TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST
6365 ? DECL_SIZE_UNIT (field) : 0;
6367 if (TREE_CODE (t) == QUAL_UNION_TYPE)
6369 tree new_q = substitute_in_expr (DECL_QUALIFIER (field), f, r);
6371 if (new_q != DECL_QUALIFIER (new_field))
6374 /* Do the substitution inside the qualifier and if we find
6375 that this field will not be present, omit it. */
6376 DECL_QUALIFIER (new_field) = new_q;
6378 if (integer_zerop (DECL_QUALIFIER (new_field)))
6382 if (last_field == 0)
6383 TYPE_FIELDS (new) = new_field;
6385 TREE_CHAIN (last_field) = new_field;
6387 last_field = new_field;
6389 /* If this is a qualified type and this field will always be
6390 present, we are done. */
6391 if (TREE_CODE (t) == QUAL_UNION_TYPE
6392 && integer_onep (DECL_QUALIFIER (new_field)))
6396 /* If this used to be a qualified union type, but we now know what
6397 field will be present, make this a normal union. */
6398 if (changed_field && TREE_CODE (new) == QUAL_UNION_TYPE
6399 && (TYPE_FIELDS (new) == 0
6400 || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new)))))
6401 TREE_SET_CODE (new, UNION_TYPE);
6402 else if (! changed_field)
6410 /* If the size was originally a constant use it. */
6411 if (TYPE_SIZE (t) != 0 && TREE_CODE (TYPE_SIZE (t)) == INTEGER_CST
6412 && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST)
6414 TYPE_SIZE (new) = TYPE_SIZE (t);
6415 TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t);
6416 SET_TYPE_ADA_SIZE (new, TYPE_ADA_SIZE (t));
6427 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
6428 needed to represent the object. */
6431 rm_size (tree gnu_type)
6433 /* For integer types, this is the precision. For record types, we store
6434 the size explicitly. For other types, this is just the size. */
6436 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type) != 0)
6437 return TYPE_RM_SIZE (gnu_type);
6438 else if (TREE_CODE (gnu_type) == RECORD_TYPE
6439 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
6440 /* Return the rm_size of the actual data plus the size of the template. */
6442 size_binop (PLUS_EXPR,
6443 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
6444 DECL_SIZE (TYPE_FIELDS (gnu_type)));
6445 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
6446 || TREE_CODE (gnu_type) == UNION_TYPE
6447 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
6448 && ! TYPE_IS_FAT_POINTER_P (gnu_type)
6449 && TYPE_ADA_SIZE (gnu_type) != 0)
6450 return TYPE_ADA_SIZE (gnu_type);
6452 return TYPE_SIZE (gnu_type);
6455 /* Return an identifier representing the external name to be used for
6456 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
6457 and the specified suffix. */
6460 create_concat_name (Entity_Id gnat_entity, const char *suffix)
6462 const char *str = (suffix == 0 ? "" : suffix);
6463 String_Template temp = {1, strlen (str)};
6464 Fat_Pointer fp = {str, &temp};
6466 Get_External_Name_With_Suffix (gnat_entity, fp);
6469 /* A variable using the Stdcall convention (meaning we are running
6470 on a Windows box) live in a DLL. Here we adjust its name to use
6471 the jump-table, the _imp__NAME contains the address for the NAME
6475 Entity_Kind kind = Ekind (gnat_entity);
6476 const char *prefix = "_imp__";
6477 int plen = strlen (prefix);
6479 if ((kind == E_Variable || kind == E_Constant)
6480 && Convention (gnat_entity) == Convention_Stdcall)
6483 for (k = 0; k <= Name_Len; k++)
6484 Name_Buffer [Name_Len - k + plen] = Name_Buffer [Name_Len - k];
6485 strncpy (Name_Buffer, prefix, plen);
6490 return get_identifier (Name_Buffer);
6493 /* Return the name to be used for GNAT_ENTITY. If a type, create a
6494 fully-qualified name, possibly with type information encoding.
6495 Otherwise, return the name. */
6498 get_entity_name (Entity_Id gnat_entity)
6500 Get_Encoded_Name (gnat_entity);
6501 return get_identifier (Name_Buffer);
6504 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
6505 string, return a new IDENTIFIER_NODE that is the concatenation of
6506 the name in GNU_ID and SUFFIX. */
6509 concat_id_with_name (tree gnu_id, const char *suffix)
6511 int len = IDENTIFIER_LENGTH (gnu_id);
6513 strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id),
6514 IDENTIFIER_LENGTH (gnu_id));
6515 strncpy (Name_Buffer + len, "___", 3);
6517 strcpy (Name_Buffer + len, suffix);
6518 return get_identifier (Name_Buffer);
6521 #include "gt-ada-decl.h"