1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2003, 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"
54 /* Setting this to 1 suppresses hashing of types. */
55 extern int debug_no_type_hash;
57 /* Provide default values for the macros controlling stack checking.
58 This is copied from GCC's expr.h. */
60 #ifndef STACK_CHECK_BUILTIN
61 #define STACK_CHECK_BUILTIN 0
63 #ifndef STACK_CHECK_PROBE_INTERVAL
64 #define STACK_CHECK_PROBE_INTERVAL 4096
66 #ifndef STACK_CHECK_MAX_FRAME_SIZE
67 #define STACK_CHECK_MAX_FRAME_SIZE \
68 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
70 #ifndef STACK_CHECK_MAX_VAR_SIZE
71 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
74 /* These two variables are used to defer recursively expanding incomplete
75 types while we are processing a record or subprogram type. */
77 static int defer_incomplete_level = 0;
78 static struct incomplete
80 struct incomplete *next;
83 } *defer_incomplete_list = 0;
85 static tree substitution_list PARAMS ((Entity_Id, Entity_Id,
87 static int allocatable_size_p PARAMS ((tree, int));
88 static struct attrib *build_attr_list PARAMS ((Entity_Id));
89 static tree elaborate_expression PARAMS ((Node_Id, Entity_Id, tree,
91 static int is_variable_size PARAMS ((tree));
92 static tree elaborate_expression_1 PARAMS ((Node_Id, Entity_Id, tree,
94 static tree make_packable_type PARAMS ((tree));
95 static tree maybe_pad_type PARAMS ((tree, tree, unsigned int,
96 Entity_Id, const char *, int,
98 static tree gnat_to_gnu_field PARAMS ((Entity_Id, tree, int, int));
99 static void components_to_record PARAMS ((tree, Node_Id, tree, int,
100 int, tree *, int, int));
101 static int compare_field_bitpos PARAMS ((const PTR, const PTR));
102 static Uint annotate_value PARAMS ((tree));
103 static void annotate_rep PARAMS ((Entity_Id, tree));
104 static tree compute_field_positions PARAMS ((tree, tree, tree, tree,
106 static tree validate_size PARAMS ((Uint, tree, Entity_Id,
107 enum tree_code, int, int));
108 static void set_rm_size PARAMS ((Uint, tree, Entity_Id));
109 static tree make_type_from_size PARAMS ((tree, tree, int));
110 static unsigned int validate_alignment PARAMS ((Uint, Entity_Id,
112 static void check_ok_for_atomic PARAMS ((tree, Entity_Id, int));
114 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
115 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
116 refer to an Ada type. */
119 gnat_to_gnu_type (gnat_entity)
120 Entity_Id gnat_entity;
124 /* Convert the ada entity type into a GCC TYPE_DECL node. */
125 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
126 if (TREE_CODE (gnu_decl) != TYPE_DECL)
129 return TREE_TYPE (gnu_decl);
132 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
133 entity, this routine returns the equivalent GCC tree for that entity
134 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
137 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
138 initial value (in GCC tree form). This is optional for variables.
139 For renamed entities, GNU_EXPR gives the object being renamed.
141 DEFINITION is nonzero if this call is intended for a definition. This is
142 used for separate compilation where it necessary to know whether an
143 external declaration or a definition should be created if the GCC equivalent
144 was not created previously. The value of 1 is normally used for a non-zero
145 DEFINITION, but a value of 2 is used in special circumstances, defined in
149 gnat_to_gnu_entity (gnat_entity, gnu_expr, definition)
150 Entity_Id gnat_entity;
156 /* Contains the gnu XXXX_DECL tree node which is equivalent to the input
157 GNAT tree. This node will be associated with the GNAT node by calling
158 the save_gnu_tree routine at the end of the `switch' statement. */
160 /* Nonzero if we have already saved gnu_decl as a gnat association. */
162 /* Nonzero if we incremented defer_incomplete_level. */
163 int this_deferred = 0;
164 /* Nonzero if we incremented force_global. */
166 /* Nonzero if we should check to see if elaborated during processing. */
167 int maybe_present = 0;
168 /* Nonzero if we made GNU_DECL and its type here. */
169 int this_made_decl = 0;
170 struct attrib *attr_list = 0;
171 int debug_info_p = (Needs_Debug_Info (gnat_entity)
172 || debug_info_level == DINFO_LEVEL_VERBOSE);
173 Entity_Kind kind = Ekind (gnat_entity);
176 = ((Known_Esize (gnat_entity)
177 && UI_Is_In_Int_Range (Esize (gnat_entity)))
178 ? MIN (UI_To_Int (Esize (gnat_entity)),
179 IN (kind, Float_Kind)
180 ? LONG_DOUBLE_TYPE_SIZE
181 : IN (kind, Access_Kind) ? POINTER_SIZE * 2
182 : LONG_LONG_TYPE_SIZE)
183 : LONG_LONG_TYPE_SIZE);
186 = ((Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity)))
187 || From_With_Type (gnat_entity));
188 unsigned int align = 0;
190 /* Since a use of an Itype is a definition, process it as such if it
191 is not in a with'ed unit. */
193 if (! definition && Is_Itype (gnat_entity)
194 && ! present_gnu_tree (gnat_entity)
195 && In_Extended_Main_Code_Unit (gnat_entity))
197 /* Ensure that we are in a subprogram mentioned in the Scope
198 chain of this entity, our current scope is global,
199 or that we encountered a task or entry (where we can't currently
200 accurately check scoping). */
201 if (current_function_decl == 0
202 || DECL_ELABORATION_PROC_P (current_function_decl))
204 process_type (gnat_entity);
205 return get_gnu_tree (gnat_entity);
208 for (gnat_temp = Scope (gnat_entity);
209 Present (gnat_temp); gnat_temp = Scope (gnat_temp))
211 if (Is_Type (gnat_temp))
212 gnat_temp = Underlying_Type (gnat_temp);
214 if (Ekind (gnat_temp) == E_Subprogram_Body)
216 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
218 if (IN (Ekind (gnat_temp), Subprogram_Kind)
219 && Present (Protected_Body_Subprogram (gnat_temp)))
220 gnat_temp = Protected_Body_Subprogram (gnat_temp);
222 if (Ekind (gnat_temp) == E_Entry
223 || Ekind (gnat_temp) == E_Entry_Family
224 || Ekind (gnat_temp) == E_Task_Type
225 || (IN (Ekind (gnat_temp), Subprogram_Kind)
226 && present_gnu_tree (gnat_temp)
227 && (current_function_decl
228 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
230 process_type (gnat_entity);
231 return get_gnu_tree (gnat_entity);
235 /* gigi abort 122 means that the entity "gnat_entity" has an incorrect
236 scope, i.e. that its scope does not correspond to the subprogram
237 in which it is declared */
241 /* If this is entity 0, something went badly wrong. */
242 if (gnat_entity == 0)
245 /* If we've already processed this entity, return what we got last time.
246 If we are defining the node, we should not have already processed it.
247 In that case, we will abort below when we try to save a new GCC tree for
248 this object. We also need to handle the case of getting a dummy type
249 when a Full_View exists. */
251 if (present_gnu_tree (gnat_entity)
253 || (Is_Type (gnat_entity) && imported_p)))
255 gnu_decl = get_gnu_tree (gnat_entity);
257 if (TREE_CODE (gnu_decl) == TYPE_DECL
258 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
259 && IN (kind, Incomplete_Or_Private_Kind)
260 && Present (Full_View (gnat_entity)))
262 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
265 save_gnu_tree (gnat_entity, NULL_TREE, 0);
266 save_gnu_tree (gnat_entity, gnu_decl, 0);
272 /* If this is a numeric or enumeral type, or an access type, a nonzero
273 Esize must be specified unless it was specified by the programmer. */
274 if ((IN (kind, Numeric_Kind) || IN (kind, Enumeration_Kind)
275 || (IN (kind, Access_Kind)
276 && kind != E_Access_Protected_Subprogram_Type
277 && kind != E_Access_Subtype))
278 && Unknown_Esize (gnat_entity)
279 && ! Has_Size_Clause (gnat_entity))
282 /* Likewise, RM_Size must be specified for all discrete and fixed-point
284 if (IN (kind, Discrete_Or_Fixed_Point_Kind)
285 && Unknown_RM_Size (gnat_entity))
288 /* Get the name of the entity and set up the line number and filename of
289 the original definition for use in any decl we make. */
291 gnu_entity_id = get_entity_name (gnat_entity);
292 set_lineno (gnat_entity, 0);
294 /* If we get here, it means we have not yet done anything with this
295 entity. If we are not defining it here, it must be external,
296 otherwise we should have defined it already. */
297 if (! definition && ! Is_Public (gnat_entity)
298 && ! type_annotate_only
299 && kind != E_Discriminant && kind != E_Component
301 && ! (kind == E_Constant && Present (Full_View (gnat_entity)))
303 && !IN (kind, Type_Kind)
308 /* For cases when we are not defining (i.e., we are referencing from
309 another compilation unit) Public entities, show we are at global level
310 for the purpose of computing sizes. Don't do this for components or
311 discriminants since the relevant test is whether or not the record is
313 if (! definition && Is_Public (gnat_entity)
314 && ! Is_Statically_Allocated (gnat_entity)
315 && kind != E_Discriminant && kind != E_Component)
316 force_global++, this_global = 1;
318 /* Handle any attributes. */
319 if (Has_Gigi_Rep_Item (gnat_entity))
320 attr_list = build_attr_list (gnat_entity);
325 /* If this is a use of a deferred constant, get its full
327 if (! definition && Present (Full_View (gnat_entity)))
329 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
330 gnu_expr, definition);
335 /* If we have an external constant that we are not defining,
336 get the expression that is was defined to represent. We
337 may throw that expression away later if it is not a
339 Do not retrieve the expression if it is an aggregate, because
340 in complex instantiation contexts it may not be expanded */
343 && Present (Expression (Declaration_Node (gnat_entity)))
344 && ! No_Initialization (Declaration_Node (gnat_entity))
345 && Nkind (Expression (Declaration_Node (gnat_entity)))
347 gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity)));
349 /* Ignore deferred constant definitions; they are processed fully in the
350 front-end. For deferred constant references, get the full
351 definition. On the other hand, constants that are renamings are
352 handled like variable renamings. If No_Initialization is set, this is
353 not a deferred constant but a constant whose value is built
356 if (definition && gnu_expr == 0
357 && ! No_Initialization (Declaration_Node (gnat_entity))
358 && No (Renamed_Object (gnat_entity)))
360 gnu_decl = error_mark_node;
364 else if (! definition && IN (kind, Incomplete_Or_Private_Kind)
365 && Present (Full_View (gnat_entity)))
367 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
376 /* If this is not a VMS exception, treat it as a normal object.
377 Otherwise, make an object at the specific address of character
378 type, point to it, and convert it to integer, and mask off
380 if (! Is_VMS_Exception (gnat_entity))
383 /* Allocate the global object that we use to get the value of the
385 gnu_decl = create_var_decl (gnu_entity_id,
386 (Present (Interface_Name (gnat_entity))
387 ? create_concat_name (gnat_entity, 0)
389 char_type_node, NULL_TREE, 0, 0, 1, 1,
392 /* Now return the expression giving the desired value. */
394 = build_binary_op (BIT_AND_EXPR, integer_type_node,
395 convert (integer_type_node,
396 build_unary_op (ADDR_EXPR, NULL_TREE,
398 build_unary_op (NEGATE_EXPR, integer_type_node,
399 build_int_2 (7, 0)));
401 save_gnu_tree (gnat_entity, gnu_decl, 1);
408 /* The GNAT record where the component was defined. */
409 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
411 /* If the variable is an inherited record component (in the case of
412 extended record types), just return the inherited entity, which
413 must be a FIELD_DECL. Likewise for discriminants.
414 For discriminants of untagged records which have explicit
415 stored discriminants, return the entity for the corresponding
416 stored discriminant. Also use Original_Record_Component
417 if the record has a private extension. */
419 if ((Base_Type (gnat_record) == gnat_record
420 || Ekind (Scope (gnat_entity)) == E_Private_Subtype
421 || Ekind (Scope (gnat_entity)) == E_Record_Subtype_With_Private
422 || Ekind (Scope (gnat_entity)) == E_Record_Type_With_Private)
423 && Present (Original_Record_Component (gnat_entity))
424 && Original_Record_Component (gnat_entity) != gnat_entity)
427 = gnat_to_gnu_entity (Original_Record_Component (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 previous
440 else if (Present (Corresponding_Discriminant (gnat_entity))
441 && Is_Tagged_Type (gnat_record))
443 /* A tagged record has no explicit stored discriminants. */
445 if (First_Discriminant (gnat_record)
446 != First_Stored_Discriminant (gnat_record))
450 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
451 gnu_expr, definition);
456 /* If the enclosing record has explicit stored discriminants,
457 then it is an untagged record. If the Corresponding_Discriminant
458 is not empty then this must be a renamed discriminant and its
459 Original_Record_Component must point to the corresponding explicit
460 stored discriminant (i.e., we should have taken the first
463 else if (Present (Corresponding_Discriminant (gnat_entity))
464 && (First_Discriminant (gnat_record)
465 != First_Stored_Discriminant (gnat_record)))
468 /* Otherwise, if we are not defining this and we have no GCC type
469 for the containing record, make one for it. Then we should
470 have made our own equivalent. */
471 else if (! definition && ! present_gnu_tree (gnat_record))
473 /* ??? If this is in a record whose scope is a protected
474 type and we have an Original_Record_Component, use it.
475 This is a workaround for major problems in protected type
478 Entity_Id Scop = Scope (Scope (gnat_entity));
479 if ((Is_Protected_Type (Scop)
480 || (Is_Private_Type (Scop)
481 && Present (Full_View (Scop))
482 && Is_Protected_Type (Full_View (Scop))))
483 && Present (Original_Record_Component (gnat_entity)))
486 = gnat_to_gnu_entity (Original_Record_Component
488 gnu_expr, definition);
493 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
494 gnu_decl = get_gnu_tree (gnat_entity);
499 /* Here we have no GCC type and this is a reference rather than a
500 definition. This should never happen. Most likely the cause is a
501 reference before declaration in the gnat tree for gnat_entity. */
506 case E_Loop_Parameter:
507 case E_Out_Parameter:
510 /* Simple variables, loop variables, OUT parameters, and exceptions. */
515 = ((kind == E_Constant || kind == E_Variable)
516 && ! Is_Statically_Allocated (gnat_entity)
517 && Is_True_Constant (gnat_entity)
518 && (((Nkind (Declaration_Node (gnat_entity))
519 == N_Object_Declaration)
520 && Present (Expression (Declaration_Node (gnat_entity))))
521 || Present (Renamed_Object (gnat_entity))));
522 int inner_const_flag = const_flag;
523 int static_p = Is_Statically_Allocated (gnat_entity);
524 tree gnu_ext_name = NULL_TREE;
526 if (Present (Renamed_Object (gnat_entity)) && ! definition)
528 if (kind == E_Exception)
529 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
532 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
535 /* Get the type after elaborating the renamed object. */
536 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
538 /* If this is a loop variable, its type should be the base type.
539 This is because the code for processing a loop determines whether
540 a normal loop end test can be done by comparing the bounds of the
541 loop against those of the base type, which is presumed to be the
542 size used for computation. But this is not correct when the size
543 of the subtype is smaller than the type. */
544 if (kind == E_Loop_Parameter)
545 gnu_type = get_base_type (gnu_type);
547 /* Reject non-renamed objects whose types are unconstrained arrays or
548 any object whose type is a dummy type or VOID_TYPE. */
550 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
551 && No (Renamed_Object (gnat_entity)))
552 || TYPE_IS_DUMMY_P (gnu_type)
553 || TREE_CODE (gnu_type) == VOID_TYPE)
555 if (type_annotate_only)
556 return error_mark_node;
561 /* If we are defining the object, see if it has a Size value and
562 validate it if so. Then get the new type, if any. */
564 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
565 gnat_entity, VAR_DECL, 0,
566 Has_Size_Clause (gnat_entity));
571 = make_type_from_size (gnu_type, gnu_size,
572 Has_Biased_Representation (gnat_entity));
574 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
578 /* If this object has self-referential size, it must be a record with
579 a default value. We are supposed to allocate an object of the
580 maximum size in this case unless it is a constant with an
581 initializing expression, in which case we can get the size from
582 that. Note that the resulting size may still be a variable, so
583 this may end up with an indirect allocation. */
585 if (No (Renamed_Object (gnat_entity))
586 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
588 if (gnu_expr != 0 && kind == E_Constant)
590 gnu_size = TYPE_SIZE (TREE_TYPE (gnu_expr));
591 if (CONTAINS_PLACEHOLDER_P (gnu_size))
592 gnu_size = build (WITH_RECORD_EXPR, bitsizetype,
596 /* We may have no GNU_EXPR because No_Initialization is
597 set even though there's an Expression. */
598 else if (kind == E_Constant
599 && (Nkind (Declaration_Node (gnat_entity))
600 == N_Object_Declaration)
601 && Present (Expression (Declaration_Node (gnat_entity))))
603 = TYPE_SIZE (gnat_to_gnu_type
605 (Expression (Declaration_Node (gnat_entity)))));
607 gnu_size = max_size (TYPE_SIZE (gnu_type), 1);
610 /* If the size is zero bytes, make it one byte since some linkers have
611 trouble with zero-sized objects. If the object will have a
612 template, that will make it nonzero so don't bother. Also avoid
613 doing that for an object renaming or an object with an address
614 clause, as we would lose useful information on the view size
615 (e.g. for null array slices) and we are not allocating the object
617 if (((gnu_size != 0 && integer_zerop (gnu_size))
618 || (TYPE_SIZE (gnu_type) != 0
619 && integer_zerop (TYPE_SIZE (gnu_type))))
620 && (! Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
621 || ! Is_Array_Type (Etype (gnat_entity)))
622 && ! Present (Renamed_Object (gnat_entity))
623 && ! Present (Address_Clause (gnat_entity)))
624 gnu_size = bitsize_unit_node;
626 /* If an alignment is specified, use it if valid. Note that
627 exceptions are objects but don't have alignments. */
628 if (kind != E_Exception && Known_Alignment (gnat_entity))
630 if (No (Alignment (gnat_entity)))
634 = validate_alignment (Alignment (gnat_entity), gnat_entity,
635 TYPE_ALIGN (gnu_type));
638 /* If this is an atomic object with no specified size and alignment,
639 but where the size of the type is a constant, set the alignment to
640 the lowest power of two greater than the size, or to the
641 biggest meaningful alignment, whichever is smaller. */
643 if (Is_Atomic (gnat_entity) && gnu_size == 0 && align == 0
644 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
646 if (! host_integerp (TYPE_SIZE (gnu_type), 1)
647 || 0 <= compare_tree_int (TYPE_SIZE (gnu_type),
649 align = BIGGEST_ALIGNMENT;
651 align = ((unsigned int) 1
652 << (floor_log2 (tree_low_cst
653 (TYPE_SIZE (gnu_type), 1) - 1)
657 /* If the object is set to have atomic components, find the component
658 type and validate it.
660 ??? Note that we ignore Has_Volatile_Components on objects; it's
661 not at all clear what to do in that case. */
663 if (Has_Atomic_Components (gnat_entity))
666 = (TREE_CODE (gnu_type) == ARRAY_TYPE
667 ? TREE_TYPE (gnu_type) : gnu_type);
669 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
670 && TYPE_MULTI_ARRAY_P (gnu_inner))
671 gnu_inner = TREE_TYPE (gnu_inner);
673 check_ok_for_atomic (gnu_inner, gnat_entity, 1);
676 /* Now check if the type of the object allows atomic access. Note
677 that we must test the type, even if this object has size and
678 alignment to allow such access, because we will be going
679 inside the padded record to assign to the object. We could fix
680 this by always copying via an intermediate value, but it's not
681 clear it's worth the effort. */
682 if (Is_Atomic (gnat_entity))
683 check_ok_for_atomic (gnu_type, gnat_entity, 0);
685 /* If this is an aliased object with an unconstrained nominal subtype,
686 make a type that includes the template. */
687 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
688 && Is_Array_Type (Etype (gnat_entity))
689 && ! type_annotate_only)
692 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
694 = TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_fat))));
697 = build_unc_object_type (gnu_temp_type, gnu_type,
698 concat_id_with_name (gnu_entity_id,
702 #ifdef MINIMUM_ATOMIC_ALIGNMENT
703 /* If the size is a constant and no alignment is specified, force
704 the alignment to be the minimum valid atomic alignment. The
705 restriction on constant size avoids problems with variable-size
706 temporaries; if the size is variable, there's no issue with
707 atomic access. Also don't do this for a constant, since it isn't
708 necessary and can interfere with constant replacement. Finally,
709 do not do it for Out parameters since that creates an
710 size inconsistency with In parameters. */
711 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
712 && ! FLOAT_TYPE_P (gnu_type)
713 && ! const_flag && No (Renamed_Object (gnat_entity))
714 && ! imported_p && No (Address_Clause (gnat_entity))
715 && kind != E_Out_Parameter
716 && (gnu_size != 0 ? TREE_CODE (gnu_size) == INTEGER_CST
717 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
718 align = MINIMUM_ATOMIC_ALIGNMENT;
721 /* Make a new type with the desired size and alignment, if needed. */
722 gnu_type = maybe_pad_type (gnu_type, gnu_size, align,
723 gnat_entity, "PAD", 0, definition, 1);
725 /* Make a volatile version of this object's type if we are to
726 make the object volatile. Note that 13.3(19) says that we
727 should treat other types of objects as volatile as well. */
728 if ((Treat_As_Volatile (gnat_entity)
729 || Is_Exported (gnat_entity)
730 || Is_Imported (gnat_entity)
731 || Present (Address_Clause (gnat_entity)))
732 && ! TYPE_VOLATILE (gnu_type))
733 gnu_type = build_qualified_type (gnu_type,
734 (TYPE_QUALS (gnu_type)
735 | TYPE_QUAL_VOLATILE));
737 /* Convert the expression to the type of the object except in the
738 case where the object's type is unconstrained or the object's type
739 is a padded record whose field is of self-referential size. In
740 the former case, converting will generate unnecessary evaluations
741 of the CONSTRUCTOR to compute the size and in the latter case, we
742 want to only copy the actual data. */
744 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
745 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
746 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
747 && TYPE_IS_PADDING_P (gnu_type)
748 && (CONTAINS_PLACEHOLDER_P
749 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
750 gnu_expr = convert (gnu_type, gnu_expr);
752 /* See if this is a renaming. If this is a constant renaming,
753 treat it as a normal variable whose initial value is what
754 is being renamed. We cannot do this if the type is
755 unconstrained or class-wide.
757 Otherwise, if what we are renaming is a reference, we can simply
758 return a stabilized version of that reference, after forcing
759 any SAVE_EXPRs to be evaluated. But, if this is at global level,
760 we can only do this if we know no SAVE_EXPRs will be made.
761 Otherwise, make this into a constant pointer to the object we are
764 if (Present (Renamed_Object (gnat_entity)))
766 /* If the renamed object had padding, strip off the reference
767 to the inner object and reset our type. */
768 if (TREE_CODE (gnu_expr) == COMPONENT_REF
769 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
771 && (TYPE_IS_PADDING_P
772 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
774 gnu_expr = TREE_OPERAND (gnu_expr, 0);
775 gnu_type = TREE_TYPE (gnu_expr);
779 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
780 && TYPE_MODE (gnu_type) != BLKmode
781 && Ekind (Etype (gnat_entity)) != E_Class_Wide_Type
782 && !Is_Array_Type (Etype (gnat_entity)))
785 /* If this is a declaration or reference, we can just use that
786 declaration or reference as this entity. */
787 else if ((DECL_P (gnu_expr)
788 || TREE_CODE_CLASS (TREE_CODE (gnu_expr)) == 'r')
789 && ! Materialize_Entity (gnat_entity)
790 && (! global_bindings_p ()
791 || (staticp (gnu_expr)
792 && ! TREE_SIDE_EFFECTS (gnu_expr))))
794 set_lineno (gnat_entity, ! global_bindings_p ());
795 gnu_decl = gnat_stabilize_reference (gnu_expr, 1);
796 save_gnu_tree (gnat_entity, gnu_decl, 1);
799 if (! global_bindings_p ())
800 expand_expr_stmt (build1 (CONVERT_EXPR, void_type_node,
806 inner_const_flag = TREE_READONLY (gnu_expr);
808 gnu_type = build_reference_type (gnu_type);
809 gnu_expr = build_unary_op (ADDR_EXPR, gnu_type, gnu_expr);
815 /* If this is an aliased object whose nominal subtype is unconstrained,
816 the object is a record that contains both the template and
817 the object. If there is an initializer, it will have already
818 been converted to the right type, but we need to create the
819 template if there is no initializer. */
820 else if (definition && TREE_CODE (gnu_type) == RECORD_TYPE
821 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
822 /* Beware that padding might have been introduced
823 via maybe_pad_type above. */
824 || (TYPE_IS_PADDING_P (gnu_type)
825 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
827 && TYPE_CONTAINS_TEMPLATE_P
828 (TREE_TYPE (TYPE_FIELDS (gnu_type)))))
832 = TYPE_IS_PADDING_P (gnu_type)
833 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
834 : TYPE_FIELDS (gnu_type);
837 = gnat_build_constructor
841 build_template (TREE_TYPE (template_field),
842 TREE_TYPE (TREE_CHAIN (template_field)),
847 /* If this is a pointer and it does not have an initializing
848 expression, initialize it to NULL, unless the obect is
851 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
852 && !Is_Imported (gnat_entity)
854 gnu_expr = integer_zero_node;
856 /* If we are defining the object and it has an Address clause we must
857 get the address expression from the saved GCC tree for the
858 object if the object has a Freeze_Node. Otherwise, we elaborate
859 the address expression here since the front-end has guaranteed
860 in that case that the elaboration has no effects. Note that
861 only the latter mechanism is currently in use. */
862 if (definition && Present (Address_Clause (gnat_entity)))
865 = (present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity)
866 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
868 save_gnu_tree (gnat_entity, NULL_TREE, 0);
870 /* Ignore the size. It's either meaningless or was handled
873 gnu_type = build_reference_type (gnu_type);
874 gnu_address = convert (gnu_type, gnu_address);
876 const_flag = ! Is_Public (gnat_entity);
878 /* If we don't have an initializing expression for the underlying
879 variable, the initializing expression for the pointer is the
880 specified address. Otherwise, we have to make a COMPOUND_EXPR
881 to assign both the address and the initial value. */
883 gnu_expr = gnu_address;
886 = build (COMPOUND_EXPR, gnu_type,
888 (MODIFY_EXPR, NULL_TREE,
889 build_unary_op (INDIRECT_REF, NULL_TREE,
895 /* If it has an address clause and we are not defining it, mark it
896 as an indirect object. Likewise for Stdcall objects that are
898 if ((! definition && Present (Address_Clause (gnat_entity)))
899 || (Is_Imported (gnat_entity)
900 && Convention (gnat_entity) == Convention_Stdcall))
902 gnu_type = build_reference_type (gnu_type);
907 /* If we are at top level and this object is of variable size,
908 make the actual type a hidden pointer to the real type and
909 make the initializer be a memory allocation and initialization.
910 Likewise for objects we aren't defining (presumed to be
911 external references from other packages), but there we do
912 not set up an initialization.
914 If the object's size overflows, make an allocator too, so that
915 Storage_Error gets raised. Note that we will never free
916 such memory, so we presume it never will get allocated. */
918 if (! allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
919 global_bindings_p () || ! definition
922 && ! allocatable_size_p (gnu_size,
923 global_bindings_p () || ! definition
926 gnu_type = build_reference_type (gnu_type);
931 /* Get the data part of GNU_EXPR in case this was a
932 aliased object whose nominal subtype is unconstrained.
933 In that case the pointer above will be a thin pointer and
934 build_allocator will automatically make the template and
935 constructor already made above. */
939 tree gnu_alloc_type = TREE_TYPE (gnu_type);
941 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
942 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
945 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
947 = build_component_ref
948 (gnu_expr, NULL_TREE,
949 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), 0);
952 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
953 && TREE_CONSTANT_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
954 && ! Is_Imported (gnat_entity))
955 post_error ("Storage_Error will be raised at run-time?",
958 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr,
959 gnu_type, 0, 0, gnat_entity);
968 /* If this object would go into the stack and has an alignment
969 larger than the default largest alignment, make a variable
970 to hold the "aligning type" with a modified initial value,
971 if any, then point to it and make that the value of this
972 variable, which is now indirect. */
974 if (! global_bindings_p () && ! static_p && definition
975 && ! imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
978 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
979 TYPE_SIZE_UNIT (gnu_type));
982 set_lineno (gnat_entity, 1);
984 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
985 NULL_TREE, gnu_new_type, gnu_expr,
991 (MODIFY_EXPR, NULL_TREE,
992 build_component_ref (gnu_new_var, NULL_TREE,
993 TYPE_FIELDS (gnu_new_type), 0),
996 gnu_type = build_reference_type (gnu_type);
999 (ADDR_EXPR, gnu_type,
1000 build_component_ref (gnu_new_var, NULL_TREE,
1001 TYPE_FIELDS (gnu_new_type), 0));
1008 /* Convert the expression to the type of the object except in the
1009 case where the object's type is unconstrained or the object's type
1010 is a padded record whose field is of self-referential size. In
1011 the former case, converting will generate unnecessary evaluations
1012 of the CONSTRUCTOR to compute the size and in the latter case, we
1013 want to only copy the actual data. */
1015 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1016 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1017 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
1018 && TYPE_IS_PADDING_P (gnu_type)
1019 && (CONTAINS_PLACEHOLDER_P
1020 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1021 gnu_expr = convert (gnu_type, gnu_expr);
1023 /* This name is external or there was a name specified, use it.
1024 Don't use the Interface_Name if there is an address clause.
1026 if ((Present (Interface_Name (gnat_entity))
1027 && No (Address_Clause (gnat_entity)))
1028 || (Is_Public (gnat_entity)
1029 && (! Is_Imported (gnat_entity) || Is_Exported (gnat_entity))))
1030 gnu_ext_name = create_concat_name (gnat_entity, 0);
1033 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1034 | TYPE_QUAL_CONST));
1036 /* If this is constant initialized to a static constant and the
1037 object has an aggregrate type, force it to be statically
1039 if (const_flag && gnu_expr && TREE_CONSTANT (gnu_expr)
1040 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1041 && (AGGREGATE_TYPE_P (gnu_type)
1042 && ! (TREE_CODE (gnu_type) == RECORD_TYPE
1043 && TYPE_IS_PADDING_P (gnu_type))))
1046 set_lineno (gnat_entity, ! global_bindings_p ());
1047 gnu_decl = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1048 gnu_expr, const_flag,
1049 Is_Public (gnat_entity),
1050 imported_p || !definition,
1051 static_p, attr_list);
1053 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1054 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1056 if (definition && DECL_SIZE (gnu_decl) != 0
1057 && gnu_block_stack != 0
1058 && TREE_VALUE (gnu_block_stack) != 0
1059 && (TREE_CODE (DECL_SIZE (gnu_decl)) != INTEGER_CST
1060 || (flag_stack_check && ! STACK_CHECK_BUILTIN
1061 && 0 < compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1062 STACK_CHECK_MAX_VAR_SIZE))))
1063 update_setjmp_buf (TREE_VALUE (gnu_block_stack));
1065 /* If this is a public constant or we're not optimizing and we're not
1066 making a VAR_DECL for it, make one just for export or debugger
1067 use. Likewise if the address is taken or if the object or type is
1069 if (definition && TREE_CODE (gnu_decl) == CONST_DECL
1070 && (Is_Public (gnat_entity)
1072 || Address_Taken (gnat_entity)
1073 || Is_Aliased (gnat_entity)
1074 || Is_Aliased (Etype (gnat_entity))))
1075 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl,
1076 create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1077 gnu_expr, 0, Is_Public (gnat_entity), 0,
1080 /* If this is declared in a block that contains an block with an
1081 exception handler, we must force this variable in memory to
1082 suppress an invalid optimization. */
1083 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1084 && Exception_Mechanism != GCC_ZCX)
1086 gnat_mark_addressable (gnu_decl);
1087 flush_addressof (gnu_decl);
1090 /* Back-annotate the Alignment of the object if not already in the
1091 tree. Likewise for Esize if the object is of a constant size.
1092 But if the "object" is actually a pointer to an object, the
1093 alignment and size are the same as teh type, so don't back-annotate
1094 the values for the pointer. */
1095 if (! used_by_ref && Unknown_Alignment (gnat_entity))
1096 Set_Alignment (gnat_entity,
1097 UI_From_Int (DECL_ALIGN (gnu_decl) / BITS_PER_UNIT));
1099 if (! used_by_ref && Unknown_Esize (gnat_entity)
1100 && DECL_SIZE (gnu_decl) != 0)
1102 tree gnu_back_size = DECL_SIZE (gnu_decl);
1104 if (TREE_CODE (TREE_TYPE (gnu_decl)) == RECORD_TYPE
1105 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_decl)))
1107 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN
1108 (TYPE_FIELDS (TREE_TYPE (gnu_decl)))));
1110 Set_Esize (gnat_entity, annotate_value (gnu_back_size));
1116 /* Return a TYPE_DECL for "void" that we previously made. */
1117 gnu_decl = void_type_decl_node;
1120 case E_Enumeration_Type:
1121 /* A special case, for the types Character and Wide_Character in
1122 Standard, we do not list all the literals. So if the literals
1123 are not specified, make this an unsigned type. */
1124 if (No (First_Literal (gnat_entity)))
1126 gnu_type = make_unsigned_type (esize);
1130 /* Normal case of non-character type, or non-Standard character type */
1132 /* Here we have a list of enumeral constants in First_Literal.
1133 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1134 the list to be places into TYPE_FIELDS. Each node in the list
1135 is a TREE_LIST node whose TREE_VALUE is the literal name
1136 and whose TREE_PURPOSE is the value of the literal.
1138 Esize contains the number of bits needed to represent the enumeral
1139 type, Type_Low_Bound also points to the first literal and
1140 Type_High_Bound points to the last literal. */
1142 Entity_Id gnat_literal;
1143 tree gnu_literal_list = NULL_TREE;
1145 if (Is_Unsigned_Type (gnat_entity))
1146 gnu_type = make_unsigned_type (esize);
1148 gnu_type = make_signed_type (esize);
1150 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1152 for (gnat_literal = First_Literal (gnat_entity);
1153 Present (gnat_literal);
1154 gnat_literal = Next_Literal (gnat_literal))
1156 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1159 = create_var_decl (get_entity_name (gnat_literal),
1160 0, gnu_type, gnu_value, 1, 0, 0, 0, 0);
1162 save_gnu_tree (gnat_literal, gnu_literal, 0);
1163 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1164 gnu_value, gnu_literal_list);
1167 TYPE_FIELDS (gnu_type) = nreverse (gnu_literal_list);
1169 /* Note that the bounds are updated at the end of this function
1170 because to avoid an infinite recursion when we get the bounds of
1171 this type, since those bounds are objects of this type. */
1175 case E_Signed_Integer_Type:
1176 case E_Ordinary_Fixed_Point_Type:
1177 case E_Decimal_Fixed_Point_Type:
1178 /* For integer types, just make a signed type the appropriate number
1180 gnu_type = make_signed_type (esize);
1183 case E_Modular_Integer_Type:
1184 /* For modular types, make the unsigned type of the proper number of
1185 bits and then set up the modulus, if required. */
1187 enum machine_mode mode;
1191 if (Is_Packed_Array_Type (gnat_entity))
1192 esize = UI_To_Int (RM_Size (gnat_entity));
1194 /* Find the smallest mode at least ESIZE bits wide and make a class
1197 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1198 GET_MODE_BITSIZE (mode) < esize;
1199 mode = GET_MODE_WIDER_MODE (mode))
1202 gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode));
1203 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
1204 = Is_Packed_Array_Type (gnat_entity);
1206 /* Get the modulus in this type. If it overflows, assume it is because
1207 it is equal to 2**Esize. Note that there is no overflow checking
1208 done on unsigned type, so we detect the overflow by looking for
1209 a modulus of zero, which is otherwise invalid. */
1210 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1212 if (! integer_zerop (gnu_modulus))
1214 TYPE_MODULAR_P (gnu_type) = 1;
1215 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1216 gnu_high = fold (build (MINUS_EXPR, gnu_type, gnu_modulus,
1217 convert (gnu_type, integer_one_node)));
1220 /* If we have to set TYPE_PRECISION different from its natural value,
1221 make a subtype to do do. Likewise if there is a modulus and
1222 it is not one greater than TYPE_MAX_VALUE. */
1223 if (TYPE_PRECISION (gnu_type) != esize
1224 || (TYPE_MODULAR_P (gnu_type)
1225 && ! tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high)))
1227 tree gnu_subtype = make_node (INTEGER_TYPE);
1229 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1230 TREE_TYPE (gnu_subtype) = gnu_type;
1231 TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type);
1232 TYPE_MAX_VALUE (gnu_subtype)
1233 = TYPE_MODULAR_P (gnu_type)
1234 ? gnu_high : TYPE_MAX_VALUE (gnu_type);
1235 TYPE_PRECISION (gnu_subtype) = esize;
1236 TREE_UNSIGNED (gnu_subtype) = 1;
1237 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1238 TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype)
1239 = Is_Packed_Array_Type (gnat_entity);
1240 layout_type (gnu_subtype);
1242 gnu_type = gnu_subtype;
1247 case E_Signed_Integer_Subtype:
1248 case E_Enumeration_Subtype:
1249 case E_Modular_Integer_Subtype:
1250 case E_Ordinary_Fixed_Point_Subtype:
1251 case E_Decimal_Fixed_Point_Subtype:
1253 /* For integral subtypes, we make a new INTEGER_TYPE. Note
1254 that we do not want to call build_range_type since we would
1255 like each subtype node to be distinct. This will be important
1256 when memory aliasing is implemented.
1258 The TREE_TYPE field of the INTEGER_TYPE we make points to the
1259 parent type; this fact is used by the arithmetic conversion
1262 We elaborate the Ancestor_Subtype if it is not in the current
1263 unit and one of our bounds is non-static. We do this to ensure
1264 consistent naming in the case where several subtypes share the same
1265 bounds by always elaborating the first such subtype first, thus
1269 && Present (Ancestor_Subtype (gnat_entity))
1270 && ! In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1271 && (! Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1272 || ! Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1273 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1274 gnu_expr, definition);
1276 gnu_type = make_node (INTEGER_TYPE);
1277 if (Is_Packed_Array_Type (gnat_entity))
1279 esize = UI_To_Int (RM_Size (gnat_entity));
1280 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1283 TYPE_PRECISION (gnu_type) = esize;
1284 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1286 TYPE_MIN_VALUE (gnu_type)
1287 = convert (TREE_TYPE (gnu_type),
1288 elaborate_expression (Type_Low_Bound (gnat_entity),
1290 get_identifier ("L"), definition, 1,
1291 Needs_Debug_Info (gnat_entity)));
1293 TYPE_MAX_VALUE (gnu_type)
1294 = convert (TREE_TYPE (gnu_type),
1295 elaborate_expression (Type_High_Bound (gnat_entity),
1297 get_identifier ("U"), definition, 1,
1298 Needs_Debug_Info (gnat_entity)));
1300 /* One of the above calls might have caused us to be elaborated,
1301 so don't blow up if so. */
1302 if (present_gnu_tree (gnat_entity))
1308 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1309 = Has_Biased_Representation (gnat_entity);
1311 /* This should be an unsigned type if the lower bound is constant
1312 and non-negative or if the base type is unsigned; a signed type
1314 TREE_UNSIGNED (gnu_type)
1315 = (TREE_UNSIGNED (TREE_TYPE (gnu_type))
1316 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
1317 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
1318 || TYPE_BIASED_REPRESENTATION_P (gnu_type)
1319 || Is_Unsigned_Type (gnat_entity));
1321 layout_type (gnu_type);
1323 if (Is_Packed_Array_Type (gnat_entity) && BYTES_BIG_ENDIAN)
1325 tree gnu_field_type = gnu_type;
1328 TYPE_RM_SIZE_INT (gnu_field_type)
1329 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1330 gnu_type = make_node (RECORD_TYPE);
1331 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "LJM");
1332 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1333 TYPE_PACKED (gnu_type) = 1;
1334 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1335 gnu_field_type, gnu_type, 1, 0, 0, 1),
1336 finish_record_type (gnu_type, gnu_field, 0, 0);
1337 TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1338 SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize));
1343 case E_Floating_Point_Type:
1344 /* If this is a VAX floating-point type, use an integer of the proper
1345 size. All the operations will be handled with ASM statements. */
1346 if (Vax_Float (gnat_entity))
1348 gnu_type = make_signed_type (esize);
1349 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1350 SET_TYPE_DIGITS_VALUE (gnu_type,
1351 UI_To_Int (Digits_Value (gnat_entity)));
1355 /* The type of the Low and High bounds can be our type if this is
1356 a type from Standard, so set them at the end of the function. */
1357 gnu_type = make_node (REAL_TYPE);
1358 TYPE_PRECISION (gnu_type) = esize;
1359 layout_type (gnu_type);
1362 case E_Floating_Point_Subtype:
1363 if (Vax_Float (gnat_entity))
1365 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1370 enum machine_mode mode;
1373 && Present (Ancestor_Subtype (gnat_entity))
1374 && ! In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1375 && (! Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1376 || ! Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1377 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1378 gnu_expr, definition);
1380 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
1381 (GET_MODE_WIDER_MODE (mode) != VOIDmode
1382 && GET_MODE_BITSIZE (GET_MODE_WIDER_MODE (mode)) <= esize);
1383 mode = GET_MODE_WIDER_MODE (mode))
1386 gnu_type = make_node (REAL_TYPE);
1387 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1388 TYPE_PRECISION (gnu_type) = GET_MODE_BITSIZE (mode);
1390 TYPE_MIN_VALUE (gnu_type)
1391 = convert (TREE_TYPE (gnu_type),
1392 elaborate_expression (Type_Low_Bound (gnat_entity),
1393 gnat_entity, get_identifier ("L"),
1395 Needs_Debug_Info (gnat_entity)));
1397 TYPE_MAX_VALUE (gnu_type)
1398 = convert (TREE_TYPE (gnu_type),
1399 elaborate_expression (Type_High_Bound (gnat_entity),
1400 gnat_entity, get_identifier ("U"),
1402 Needs_Debug_Info (gnat_entity)));
1404 /* One of the above calls might have caused us to be elaborated,
1405 so don't blow up if so. */
1406 if (present_gnu_tree (gnat_entity))
1412 layout_type (gnu_type);
1416 /* Array and String Types and Subtypes
1418 Unconstrained array types are represented by E_Array_Type and
1419 constrained array types are represented by E_Array_Subtype. There
1420 are no actual objects of an unconstrained array type; all we have
1421 are pointers to that type.
1423 The following fields are defined on array types and subtypes:
1425 Component_Type Component type of the array.
1426 Number_Dimensions Number of dimensions (an int).
1427 First_Index Type of first index. */
1432 tree gnu_template_fields = NULL_TREE;
1433 tree gnu_template_type = make_node (RECORD_TYPE);
1434 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1435 tree gnu_fat_type = make_node (RECORD_TYPE);
1436 int ndim = Number_Dimensions (gnat_entity);
1438 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1440 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1441 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
1442 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
1443 tree gnu_comp_size = 0;
1444 tree gnu_max_size = size_one_node;
1445 tree gnu_max_size_unit;
1447 Entity_Id gnat_ind_subtype;
1448 Entity_Id gnat_ind_base_subtype;
1449 tree gnu_template_reference;
1452 TYPE_NAME (gnu_template_type)
1453 = create_concat_name (gnat_entity, "XUB");
1454 TYPE_NAME (gnu_fat_type) = create_concat_name (gnat_entity, "XUP");
1455 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1456 TREE_READONLY (gnu_template_type) = 1;
1458 /* Make a node for the array. If we are not defining the array
1459 suppress expanding incomplete types and save the node as the type
1461 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1464 defer_incomplete_level++;
1465 this_deferred = this_made_decl = 1;
1466 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
1467 ! Comes_From_Source (gnat_entity),
1469 save_gnu_tree (gnat_entity, gnu_decl, 0);
1473 /* Build the fat pointer type. Use a "void *" object instead of
1474 a pointer to the array type since we don't have the array type
1475 yet (it will reference the fat pointer via the bounds). */
1476 tem = chainon (chainon (NULL_TREE,
1477 create_field_decl (get_identifier ("P_ARRAY"),
1479 gnu_fat_type, 0, 0, 0, 0)),
1480 create_field_decl (get_identifier ("P_BOUNDS"),
1482 gnu_fat_type, 0, 0, 0, 0));
1484 /* Make sure we can put this into a register. */
1485 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1486 finish_record_type (gnu_fat_type, tem, 0, 1);
1488 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1489 is the fat pointer. This will be used to access the individual
1490 fields once we build them. */
1491 tem = build (COMPONENT_REF, gnu_ptr_template,
1492 build (PLACEHOLDER_EXPR, gnu_fat_type),
1493 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)));
1494 gnu_template_reference
1495 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1496 TREE_READONLY (gnu_template_reference) = 1;
1498 /* Now create the GCC type for each index and add the fields for
1499 that index to the template. */
1500 for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
1501 gnat_ind_base_subtype
1502 = First_Index (Implementation_Base_Type (gnat_entity));
1503 index < ndim && index >= 0;
1505 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1506 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1508 char field_name[10];
1509 tree gnu_ind_subtype
1510 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1511 tree gnu_base_subtype
1512 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1514 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1516 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1517 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1519 /* Make the FIELD_DECLs for the minimum and maximum of this
1520 type and then make extractions of that field from the
1522 set_lineno (gnat_entity, 0);
1523 sprintf (field_name, "LB%d", index);
1524 gnu_min_field = create_field_decl (get_identifier (field_name),
1526 gnu_template_type, 0, 0, 0, 0);
1527 field_name[0] = 'U';
1528 gnu_max_field = create_field_decl (get_identifier (field_name),
1530 gnu_template_type, 0, 0, 0, 0);
1532 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1534 /* We can't use build_component_ref here since the template
1535 type isn't complete yet. */
1536 gnu_min = build (COMPONENT_REF, gnu_ind_subtype,
1537 gnu_template_reference, gnu_min_field);
1538 gnu_max = build (COMPONENT_REF, gnu_ind_subtype,
1539 gnu_template_reference, gnu_max_field);
1540 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1542 /* Make a range type with the new ranges, but using
1543 the Ada subtype. Then we convert to sizetype. */
1544 gnu_index_types[index]
1545 = create_index_type (convert (sizetype, gnu_min),
1546 convert (sizetype, gnu_max),
1547 build_range_type (gnu_ind_subtype,
1549 /* Update the maximum size of the array, in elements. */
1551 = size_binop (MULT_EXPR, gnu_max_size,
1552 size_binop (PLUS_EXPR, size_one_node,
1553 size_binop (MINUS_EXPR, gnu_base_max,
1556 TYPE_NAME (gnu_index_types[index])
1557 = create_concat_name (gnat_entity, field_name);
1560 for (index = 0; index < ndim; index++)
1562 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1564 /* Install all the fields into the template. */
1565 finish_record_type (gnu_template_type, gnu_template_fields, 0, 0);
1566 TREE_READONLY (gnu_template_type) = 1;
1568 /* Now make the array of arrays and update the pointer to the array
1569 in the fat pointer. Note that it is the first field. */
1571 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1573 /* Get and validate any specified Component_Size, but if Packed,
1574 ignore it since the front end will have taken care of it. Also,
1575 allow sizes not a multiple of Storage_Unit if packed. */
1577 = validate_size (Component_Size (gnat_entity), tem,
1579 (Is_Bit_Packed_Array (gnat_entity)
1580 ? TYPE_DECL : VAR_DECL), 1,
1581 Has_Component_Size_Clause (gnat_entity));
1583 if (Has_Atomic_Components (gnat_entity))
1584 check_ok_for_atomic (tem, gnat_entity, 1);
1586 /* If the component type is a RECORD_TYPE that has a self-referential
1587 size, use the maxium size. */
1588 if (gnu_comp_size == 0 && TREE_CODE (tem) == RECORD_TYPE
1589 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1590 gnu_comp_size = max_size (TYPE_SIZE (tem), 1);
1592 if (! Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size != 0)
1594 tem = make_type_from_size (tem, gnu_comp_size, 0);
1595 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1596 "C_PAD", 0, definition, 1);
1599 if (Has_Volatile_Components (gnat_entity))
1600 tem = build_qualified_type (tem,
1601 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1603 /* If Component_Size is not already specified, annotate it with the
1604 size of the component. */
1605 if (Unknown_Component_Size (gnat_entity))
1606 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1608 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
1609 size_binop (MULT_EXPR, gnu_max_size,
1610 TYPE_SIZE_UNIT (tem)));
1611 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
1612 size_binop (MULT_EXPR,
1613 convert (bitsizetype,
1617 for (index = ndim - 1; index >= 0; index--)
1619 tem = build_array_type (tem, gnu_index_types[index]);
1620 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1622 /* ??? For now, we say that any component of aggregate type is
1623 addressable because the front end may take 'Reference of it.
1624 But we have to make it addressable if it must be passed by
1625 reference or it that is the default. */
1626 TYPE_NONALIASED_COMPONENT (tem)
1627 = (! Has_Aliased_Components (gnat_entity)
1628 && ! AGGREGATE_TYPE_P (TREE_TYPE (tem)));
1631 /* If an alignment is specified, use it if valid. But ignore it for
1632 types that represent the unpacked base type for packed arrays. */
1633 if (No (Packed_Array_Type (gnat_entity))
1634 && Known_Alignment (gnat_entity))
1636 if (No (Alignment (gnat_entity)))
1640 = validate_alignment (Alignment (gnat_entity), gnat_entity,
1644 TYPE_CONVENTION_FORTRAN_P (tem)
1645 = (Convention (gnat_entity) == Convention_Fortran);
1646 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
1648 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
1649 corresponding fat pointer. */
1650 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
1651 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
1652 TYPE_MODE (gnu_type) = BLKmode;
1653 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
1654 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
1656 /* If the maximum size doesn't overflow, use it. */
1657 if (TREE_CODE (gnu_max_size) == INTEGER_CST
1658 && ! TREE_OVERFLOW (gnu_max_size))
1660 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
1661 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
1662 && ! TREE_OVERFLOW (gnu_max_size_unit))
1663 TYPE_SIZE_UNIT (tem)
1664 = size_binop (MIN_EXPR, gnu_max_size_unit,
1665 TYPE_SIZE_UNIT (tem));
1667 create_type_decl (create_concat_name (gnat_entity, "XUA"),
1668 tem, 0, ! Comes_From_Source (gnat_entity),
1670 rest_of_type_compilation (gnu_fat_type, global_bindings_p ());
1672 /* Create a record type for the object and its template and
1673 set the template at a negative offset. */
1674 tem = build_unc_object_type (gnu_template_type, tem,
1675 create_concat_name (gnat_entity, "XUT"));
1676 DECL_FIELD_OFFSET (TYPE_FIELDS (tem))
1677 = size_binop (MINUS_EXPR, size_zero_node,
1678 byte_position (TREE_CHAIN (TYPE_FIELDS (tem))));
1679 DECL_FIELD_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem))) = size_zero_node;
1680 DECL_FIELD_BIT_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem)))
1681 = bitsize_zero_node;
1682 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
1683 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
1685 /* Give the thin pointer type a name. */
1686 create_type_decl (create_concat_name (gnat_entity, "XUX"),
1687 build_pointer_type (tem), 0,
1688 ! Comes_From_Source (gnat_entity), debug_info_p);
1692 case E_String_Subtype:
1693 case E_Array_Subtype:
1695 /* This is the actual data type for array variables. Multidimensional
1696 arrays are implemented in the gnu tree as arrays of arrays. Note
1697 that for the moment arrays which have sparse enumeration subtypes as
1698 index components create sparse arrays, which is obviously space
1699 inefficient but so much easier to code for now.
1701 Also note that the subtype never refers to the unconstrained
1702 array type, which is somewhat at variance with Ada semantics.
1704 First check to see if this is simply a renaming of the array
1705 type. If so, the result is the array type. */
1707 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1708 if (! Is_Constrained (gnat_entity))
1713 int array_dim = Number_Dimensions (gnat_entity);
1715 = ((Convention (gnat_entity) == Convention_Fortran)
1716 ? array_dim - 1 : 0);
1718 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
1719 Entity_Id gnat_ind_subtype;
1720 Entity_Id gnat_ind_base_subtype;
1721 tree gnu_base_type = gnu_type;
1722 tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
1723 tree gnu_comp_size = 0;
1724 tree gnu_max_size = size_one_node;
1725 tree gnu_max_size_unit;
1726 int need_index_type_struct = 0;
1727 int max_overflow = 0;
1729 /* First create the gnu types for each index. Create types for
1730 debugging information to point to the index types if the
1731 are not integer types, have variable bounds, or are
1732 wider than sizetype. */
1734 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
1735 gnat_ind_base_subtype
1736 = First_Index (Implementation_Base_Type (gnat_entity));
1737 index < array_dim && index >= 0;
1739 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1740 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1742 tree gnu_index_subtype
1743 = get_unpadded_type (Etype (gnat_ind_subtype));
1745 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
1747 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
1748 tree gnu_base_subtype
1749 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1751 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1753 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1754 tree gnu_base_type = get_base_type (gnu_base_subtype);
1755 tree gnu_base_base_min
1756 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
1757 tree gnu_base_base_max
1758 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
1762 /* If the minimum and maximum values both overflow in
1763 SIZETYPE, but the difference in the original type
1764 does not overflow in SIZETYPE, ignore the overflow
1766 if ((TYPE_PRECISION (gnu_index_subtype)
1767 > TYPE_PRECISION (sizetype))
1768 && TREE_CODE (gnu_min) == INTEGER_CST
1769 && TREE_CODE (gnu_max) == INTEGER_CST
1770 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
1772 (fold (build (MINUS_EXPR, gnu_index_subtype,
1773 TYPE_MAX_VALUE (gnu_index_subtype),
1774 TYPE_MIN_VALUE (gnu_index_subtype))))))
1775 TREE_OVERFLOW (gnu_min) = TREE_OVERFLOW (gnu_max)
1776 = TREE_CONSTANT_OVERFLOW (gnu_min)
1777 = TREE_CONSTANT_OVERFLOW (gnu_max) = 0;
1779 /* Similarly, if the range is null, use bounds of 1..0 for
1780 the sizetype bounds. */
1781 else if ((TYPE_PRECISION (gnu_index_subtype)
1782 > TYPE_PRECISION (sizetype))
1783 && TREE_CODE (gnu_min) == INTEGER_CST
1784 && TREE_CODE (gnu_max) == INTEGER_CST
1785 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
1786 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
1787 TYPE_MIN_VALUE (gnu_index_subtype)))
1788 gnu_min = size_one_node, gnu_max = size_zero_node;
1790 /* Now compute the size of this bound. We need to provide
1791 GCC with an upper bound to use but have to deal with the
1792 "superflat" case. There are three ways to do this. If we
1793 can prove that the array can never be superflat, we can
1794 just use the high bound of the index subtype. If we can
1795 prove that the low bound minus one can't overflow, we
1796 can do this as MAX (hb, lb - 1). Otherwise, we have to use
1797 the expression hb >= lb ? hb : lb - 1. */
1798 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
1800 /* See if the base array type is already flat. If it is, we
1801 are probably compiling an ACVC test, but it will cause the
1802 code below to malfunction if we don't handle it specially. */
1803 if (TREE_CODE (gnu_base_min) == INTEGER_CST
1804 && TREE_CODE (gnu_base_max) == INTEGER_CST
1805 && ! TREE_CONSTANT_OVERFLOW (gnu_base_min)
1806 && ! TREE_CONSTANT_OVERFLOW (gnu_base_max)
1807 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
1808 gnu_high = size_zero_node, gnu_min = size_one_node;
1810 /* If gnu_high is now an integer which overflowed, the array
1811 cannot be superflat. */
1812 else if (TREE_CODE (gnu_high) == INTEGER_CST
1813 && TREE_OVERFLOW (gnu_high))
1815 else if (TREE_UNSIGNED (gnu_base_subtype)
1816 || TREE_CODE (gnu_high) == INTEGER_CST)
1817 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
1821 (sizetype, build_binary_op (GE_EXPR, integer_type_node,
1825 gnu_index_type[index]
1826 = create_index_type (gnu_min, gnu_high, gnu_index_subtype);
1828 /* Also compute the maximum size of the array. Here we
1829 see if any constraint on the index type of the base type
1830 can be used in the case of self-referential bound on
1831 the index type of the subtype. We look for a non-"infinite"
1832 and non-self-referential bound from any type involved and
1833 handle each bound separately. */
1835 if ((TREE_CODE (gnu_min) == INTEGER_CST
1836 && ! TREE_OVERFLOW (gnu_min)
1837 && ! operand_equal_p (gnu_min, gnu_base_base_min, 0))
1838 || ! CONTAINS_PLACEHOLDER_P (gnu_min))
1839 gnu_base_min = gnu_min;
1841 if ((TREE_CODE (gnu_max) == INTEGER_CST
1842 && ! TREE_OVERFLOW (gnu_max)
1843 && ! operand_equal_p (gnu_max, gnu_base_base_max, 0))
1844 || ! CONTAINS_PLACEHOLDER_P (gnu_max))
1845 gnu_base_max = gnu_max;
1847 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
1848 && TREE_CONSTANT_OVERFLOW (gnu_base_min))
1849 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
1850 || (TREE_CODE (gnu_base_max) == INTEGER_CST
1851 && TREE_CONSTANT_OVERFLOW (gnu_base_max))
1852 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
1855 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
1856 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
1859 = size_binop (MAX_EXPR,
1860 size_binop (PLUS_EXPR, size_one_node,
1861 size_binop (MINUS_EXPR, gnu_base_max,
1865 if (TREE_CODE (gnu_this_max) == INTEGER_CST
1866 && TREE_CONSTANT_OVERFLOW (gnu_this_max))
1870 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
1872 if (! integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
1873 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
1875 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
1876 || (TREE_TYPE (gnu_index_subtype) != 0
1877 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
1879 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
1880 || (TYPE_PRECISION (gnu_index_subtype)
1881 > TYPE_PRECISION (sizetype)))
1882 need_index_type_struct = 1;
1885 /* Then flatten: create the array of arrays. */
1887 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
1889 /* One of the above calls might have caused us to be elaborated,
1890 so don't blow up if so. */
1891 if (present_gnu_tree (gnat_entity))
1897 /* Get and validate any specified Component_Size, but if Packed,
1898 ignore it since the front end will have taken care of it. Also,
1899 allow sizes not a multiple of Storage_Unit if packed. */
1901 = validate_size (Component_Size (gnat_entity), gnu_type,
1903 (Is_Bit_Packed_Array (gnat_entity)
1904 ? TYPE_DECL : VAR_DECL),
1905 1, Has_Component_Size_Clause (gnat_entity));
1907 /* If the component type is a RECORD_TYPE that has a self-referential
1908 size, use the maxium size. */
1909 if (gnu_comp_size == 0 && TREE_CODE (gnu_type) == RECORD_TYPE
1910 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
1911 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), 1);
1913 if (! Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size != 0)
1915 gnu_type = make_type_from_size (gnu_type, gnu_comp_size, 0);
1916 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
1917 gnat_entity, "C_PAD", 0,
1921 if (Has_Volatile_Components (Base_Type (gnat_entity)))
1922 gnu_type = build_qualified_type (gnu_type,
1923 (TYPE_QUALS (gnu_type)
1924 | TYPE_QUAL_VOLATILE));
1926 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
1927 TYPE_SIZE_UNIT (gnu_type));
1928 gnu_max_size = size_binop (MULT_EXPR,
1929 convert (bitsizetype, gnu_max_size),
1930 TYPE_SIZE (gnu_type));
1932 /* We don't want any array types shared for two reasons: first,
1933 we want to keep differently-named types distinct; second,
1934 setting TYPE_MULTI_ARRAY_TYPE of one type can clobber
1936 debug_no_type_hash = 1;
1937 for (index = array_dim - 1; index >= 0; index --)
1939 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
1940 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
1941 /* ??? For now, we say that any component of aggregate type is
1942 addressable because the front end may take 'Reference.
1943 But we have to make it addressable if it must be passed by
1944 reference or it that is the default. */
1945 TYPE_NONALIASED_COMPONENT (gnu_type)
1946 = (! Has_Aliased_Components (gnat_entity)
1947 && ! AGGREGATE_TYPE_P (TREE_TYPE (gnu_type)));
1950 /* If we are at file level and this is a multi-dimensional array, we
1951 need to make a variable corresponding to the stride of the
1952 inner dimensions. */
1953 if (global_bindings_p () && array_dim > 1)
1955 tree gnu_str_name = get_identifier ("ST");
1958 for (gnu_arr_type = TREE_TYPE (gnu_type);
1959 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
1960 gnu_arr_type = TREE_TYPE (gnu_arr_type),
1961 gnu_str_name = concat_id_with_name (gnu_str_name, "ST"))
1963 TYPE_SIZE (gnu_arr_type)
1964 = elaborate_expression_1 (gnat_entity, gnat_entity,
1965 TYPE_SIZE (gnu_arr_type),
1966 gnu_str_name, definition, 0);
1967 TYPE_SIZE_UNIT (gnu_arr_type)
1968 = elaborate_expression_1
1969 (gnat_entity, gnat_entity, TYPE_SIZE_UNIT (gnu_arr_type),
1970 concat_id_with_name (gnu_str_name, "U"), definition, 0);
1974 /* If we need to write out a record type giving the names of
1975 the bounds, do it now. */
1976 if (need_index_type_struct && debug_info_p)
1978 tree gnu_bound_rec_type = make_node (RECORD_TYPE);
1979 tree gnu_field_list = 0;
1982 TYPE_NAME (gnu_bound_rec_type)
1983 = create_concat_name (gnat_entity, "XA");
1985 for (index = array_dim - 1; index >= 0; index--)
1988 = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type[index]));
1990 if (TREE_CODE (gnu_type_name) == TYPE_DECL)
1991 gnu_type_name = DECL_NAME (gnu_type_name);
1993 gnu_field = create_field_decl (gnu_type_name,
1996 0, NULL_TREE, NULL_TREE, 0);
1997 TREE_CHAIN (gnu_field) = gnu_field_list;
1998 gnu_field_list = gnu_field;
2001 finish_record_type (gnu_bound_rec_type, gnu_field_list, 0, 0);
2004 debug_no_type_hash = 0;
2005 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2006 = (Convention (gnat_entity) == Convention_Fortran);
2008 /* If our size depends on a placeholder and the maximum size doesn't
2009 overflow, use it. */
2010 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2011 && ! (TREE_CODE (gnu_max_size) == INTEGER_CST
2012 && TREE_OVERFLOW (gnu_max_size))
2013 && ! (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2014 && TREE_OVERFLOW (gnu_max_size_unit))
2017 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2018 TYPE_SIZE (gnu_type));
2019 TYPE_SIZE_UNIT (gnu_type)
2020 = size_binop (MIN_EXPR, gnu_max_size_unit,
2021 TYPE_SIZE_UNIT (gnu_type));
2024 /* Set our alias set to that of our base type. This gives all
2025 array subtypes the same alias set. */
2026 TYPE_ALIAS_SET (gnu_type) = get_alias_set (gnu_base_type);
2027 record_component_aliases (gnu_type);
2030 /* If this is a packed type, make this type the same as the packed
2031 array type, but do some adjusting in the type first. */
2033 if (Present (Packed_Array_Type (gnat_entity)))
2035 Entity_Id gnat_index;
2036 tree gnu_inner_type;
2038 /* First finish the type we had been making so that we output
2039 debugging information for it */
2040 gnu_type = build_qualified_type (gnu_type,
2041 (TYPE_QUALS (gnu_type)
2042 | (TYPE_QUAL_VOLATILE
2043 * Treat_As_Volatile (gnat_entity))));
2044 set_lineno (gnat_entity, 0);
2045 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2046 ! Comes_From_Source (gnat_entity),
2048 if (! Comes_From_Source (gnat_entity))
2049 DECL_ARTIFICIAL (gnu_decl) = 1;
2051 /* Save it as our equivalent in case the call below elaborates
2053 save_gnu_tree (gnat_entity, gnu_decl, 0);
2055 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2058 gnu_inner_type = gnu_type = TREE_TYPE (gnu_decl);
2059 save_gnu_tree (gnat_entity, NULL_TREE, 0);
2061 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2062 && (TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_inner_type)
2063 || TYPE_IS_PADDING_P (gnu_inner_type)))
2064 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2066 /* We need to point the type we just made to our index type so
2067 the actual bounds can be put into a template. */
2069 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2070 && TYPE_ACTUAL_BOUNDS (gnu_inner_type) == 0)
2071 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2072 && ! TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2074 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2076 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2077 If it is, we need to make another type. */
2078 if (TYPE_MODULAR_P (gnu_inner_type))
2082 gnu_subtype = make_node (INTEGER_TYPE);
2084 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2085 TYPE_MIN_VALUE (gnu_subtype)
2086 = TYPE_MIN_VALUE (gnu_inner_type);
2087 TYPE_MAX_VALUE (gnu_subtype)
2088 = TYPE_MAX_VALUE (gnu_inner_type);
2089 TYPE_PRECISION (gnu_subtype)
2090 = TYPE_PRECISION (gnu_inner_type);
2091 TREE_UNSIGNED (gnu_subtype)
2092 = TREE_UNSIGNED (gnu_inner_type);
2093 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2094 layout_type (gnu_subtype);
2096 gnu_inner_type = gnu_subtype;
2099 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2102 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2104 for (gnat_index = First_Index (gnat_entity);
2105 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2106 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type,
2107 tree_cons (NULL_TREE,
2108 get_unpadded_type (Etype (gnat_index)),
2109 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2111 if (Convention (gnat_entity) != Convention_Fortran)
2112 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type,
2113 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2115 if (TREE_CODE (gnu_type) == RECORD_TYPE
2116 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type))
2117 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2121 /* Abort if packed array with no packed array type field set. */
2122 else if (Is_Packed (gnat_entity))
2127 case E_String_Literal_Subtype:
2128 /* Create the type for a string literal. */
2130 Entity_Id gnat_full_type
2131 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2132 && Present (Full_View (Etype (gnat_entity)))
2133 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2134 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2135 tree gnu_string_array_type
2136 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2137 tree gnu_string_index_type
2138 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2139 (TYPE_DOMAIN (gnu_string_array_type))));
2140 tree gnu_lower_bound
2141 = convert (gnu_string_index_type,
2142 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2143 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2144 tree gnu_length = ssize_int (length - 1);
2145 tree gnu_upper_bound
2146 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2148 convert (gnu_string_index_type, gnu_length));
2150 = build_range_type (gnu_string_index_type,
2151 gnu_lower_bound, gnu_upper_bound);
2153 = create_index_type (convert (sizetype,
2154 TYPE_MIN_VALUE (gnu_range_type)),
2156 TYPE_MAX_VALUE (gnu_range_type)),
2160 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2165 /* Record Types and Subtypes
2167 The following fields are defined on record types:
2169 Has_Discriminants True if the record has discriminants
2170 First_Discriminant Points to head of list of discriminants
2171 First_Entity Points to head of list of fields
2172 Is_Tagged_Type True if the record is tagged
2174 Implementation of Ada records and discriminated records:
2176 A record type definition is transformed into the equivalent of a C
2177 struct definition. The fields that are the discriminants which are
2178 found in the Full_Type_Declaration node and the elements of the
2179 Component_List found in the Record_Type_Definition node. The
2180 Component_List can be a recursive structure since each Variant of
2181 the Variant_Part of the Component_List has a Component_List.
2183 Processing of a record type definition comprises starting the list of
2184 field declarations here from the discriminants and the calling the
2185 function components_to_record to add the rest of the fields from the
2186 component list and return the gnu type node. The function
2187 components_to_record will call itself recursively as it traverses
2191 if (Has_Complex_Representation (gnat_entity))
2194 = build_complex_type
2196 (Etype (Defining_Entity
2197 (First (Component_Items
2200 (Declaration_Node (gnat_entity)))))))));
2206 Node_Id full_definition = Declaration_Node (gnat_entity);
2207 Node_Id record_definition = Type_Definition (full_definition);
2208 Entity_Id gnat_field;
2210 tree gnu_field_list = NULL_TREE;
2211 tree gnu_get_parent;
2212 int packed = (Is_Packed (gnat_entity) ? 1
2213 : (Component_Alignment (gnat_entity)
2214 == Calign_Storage_Unit) ? -1
2216 int has_rep = Has_Specified_Layout (gnat_entity);
2217 int all_rep = has_rep;
2219 = (Is_Tagged_Type (gnat_entity)
2220 && Nkind (record_definition) == N_Derived_Type_Definition);
2222 /* See if all fields have a rep clause. Stop when we find one
2224 for (gnat_field = First_Entity (gnat_entity);
2225 Present (gnat_field) && all_rep;
2226 gnat_field = Next_Entity (gnat_field))
2227 if ((Ekind (gnat_field) == E_Component
2228 || Ekind (gnat_field) == E_Discriminant)
2229 && No (Component_Clause (gnat_field)))
2232 /* If this is a record extension, go a level further to find the
2233 record definition. Also, verify we have a Parent_Subtype. */
2236 if (! type_annotate_only
2237 || Present (Record_Extension_Part (record_definition)))
2238 record_definition = Record_Extension_Part (record_definition);
2240 if (! type_annotate_only && No (Parent_Subtype (gnat_entity)))
2244 /* Make a node for the record. If we are not defining the record,
2245 suppress expanding incomplete types and save the node as the type
2246 for GNAT_ENTITY. We use the same RECORD_TYPE as for a dummy type
2247 and reset TYPE_DUMMY_P to show it's no longer a dummy.
2249 It is very tempting to delay resetting this bit until we are done
2250 with completing the type, e.g. to let possible intermediate
2251 elaboration of access types designating the record know it is not
2252 complete and arrange for update_pointer_to to fix things up later.
2254 It would be wrong, however, because dummy types are expected only
2255 to be created for Ada incomplete or private types, which is not
2256 what we have here. Doing so would make other parts of gigi think
2257 we are dealing with a really incomplete or private type, and have
2258 nasty side effects, typically on the generation of the associated
2259 debugging information. */
2260 gnu_type = make_dummy_type (gnat_entity);
2261 TYPE_DUMMY_P (gnu_type) = 0;
2263 if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL && debug_info_p)
2264 DECL_IGNORED_P (TYPE_NAME (gnu_type)) = 0;
2266 TYPE_ALIGN (gnu_type) = 0;
2267 TYPE_PACKED (gnu_type) = packed != 0 || has_rep;
2271 defer_incomplete_level++;
2273 set_lineno (gnat_entity, 0);
2274 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2275 ! Comes_From_Source (gnat_entity),
2277 save_gnu_tree (gnat_entity, gnu_decl, 0);
2278 this_made_decl = saved = 1;
2281 /* If both a size and rep clause was specified, put the size in
2282 the record type now so that it can get the proper mode. */
2283 if (has_rep && Known_Esize (gnat_entity))
2284 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2286 /* Always set the alignment here so that it can be used to
2287 set the mode, if it is making the alignment stricter. If
2288 it is invalid, it will be checked again below. If this is to
2289 be Atomic, choose a default alignment of a word unless we know
2290 the size and it's smaller. */
2291 if (Known_Alignment (gnat_entity))
2292 TYPE_ALIGN (gnu_type)
2293 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2294 else if (Is_Atomic (gnat_entity))
2295 TYPE_ALIGN (gnu_type)
2296 = (esize >= BITS_PER_WORD ? BITS_PER_WORD
2297 : 1 << ((floor_log2 (esize) - 1) + 1));
2299 /* If we have a Parent_Subtype, make a field for the parent. If
2300 this record has rep clauses, force the position to zero. */
2301 if (Present (Parent_Subtype (gnat_entity)))
2305 /* A major complexity here is that the parent subtype will
2306 reference our discriminants. But those must reference
2307 the parent component of this record. So here we will
2308 initialize each of those components to a COMPONENT_REF.
2309 The first operand of that COMPONENT_REF is another
2310 COMPONENT_REF which will be filled in below, once
2311 the parent type can be safely built. */
2313 gnu_get_parent = build (COMPONENT_REF, void_type_node,
2314 build (PLACEHOLDER_EXPR, gnu_type),
2315 build_decl (FIELD_DECL, NULL_TREE,
2318 if (Has_Discriminants (gnat_entity))
2319 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2320 Present (gnat_field);
2321 gnat_field = Next_Stored_Discriminant (gnat_field))
2322 if (Present (Corresponding_Discriminant (gnat_field)))
2325 build (COMPONENT_REF,
2326 get_unpadded_type (Etype (gnat_field)),
2328 gnat_to_gnu_entity (Corresponding_Discriminant
2333 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_entity));
2336 = create_field_decl (get_identifier
2337 (Get_Name_String (Name_uParent)),
2338 gnu_parent, gnu_type, 0,
2339 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2340 has_rep ? bitsize_zero_node : 0, 1);
2341 DECL_INTERNAL_P (gnu_field_list) = 1;
2343 TREE_TYPE (gnu_get_parent) = gnu_parent;
2344 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2347 /* Add the fields for the discriminants into the record. */
2348 if (! Is_Unchecked_Union (gnat_entity)
2349 && Has_Discriminants (gnat_entity))
2350 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2351 Present (gnat_field);
2352 gnat_field = Next_Stored_Discriminant (gnat_field))
2354 /* If this is a record extension and this discriminant
2355 is the renaming of another discriminant, we've already
2356 handled the discriminant above. */
2357 if (Present (Parent_Subtype (gnat_entity))
2358 && Present (Corresponding_Discriminant (gnat_field)))
2362 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2364 /* Make an expression using a PLACEHOLDER_EXPR from the
2365 FIELD_DECL node just created and link that with the
2366 corresponding GNAT defining identifier. Then add to the
2368 save_gnu_tree (gnat_field,
2369 build (COMPONENT_REF, TREE_TYPE (gnu_field),
2370 build (PLACEHOLDER_EXPR,
2371 DECL_CONTEXT (gnu_field)),
2375 TREE_CHAIN (gnu_field) = gnu_field_list;
2376 gnu_field_list = gnu_field;
2379 /* Put the discriminants into the record (backwards), so we can
2380 know the appropriate discriminant to use for the names of the
2382 TYPE_FIELDS (gnu_type) = gnu_field_list;
2384 /* Add the listed fields into the record and finish up. */
2385 components_to_record (gnu_type, Component_List (record_definition),
2386 gnu_field_list, packed, definition, 0,
2389 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2390 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2392 /* If this is an extension type, reset the tree for any
2393 inherited discriminants. Also remove the PLACEHOLDER_EXPR
2394 for non-inherited discriminants. */
2395 if (! Is_Unchecked_Union (gnat_entity)
2396 && Has_Discriminants (gnat_entity))
2397 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2398 Present (gnat_field);
2399 gnat_field = Next_Stored_Discriminant (gnat_field))
2401 if (Present (Parent_Subtype (gnat_entity))
2402 && Present (Corresponding_Discriminant (gnat_field)))
2403 save_gnu_tree (gnat_field, NULL_TREE, 0);
2406 gnu_field = get_gnu_tree (gnat_field);
2407 save_gnu_tree (gnat_field, NULL_TREE, 0);
2408 save_gnu_tree (gnat_field, TREE_OPERAND (gnu_field, 1), 0);
2412 /* If it is a tagged record force the type to BLKmode to insure
2413 that these objects will always be placed in memory. Do the
2414 same thing for limited record types. */
2415 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2416 TYPE_MODE (gnu_type) = BLKmode;
2418 /* If this is a derived type, we must make the alias set of this type
2419 the same as that of the type we are derived from. We assume here
2420 that the other type is already frozen. */
2421 if (Etype (gnat_entity) != gnat_entity
2422 && ! (Is_Private_Type (Etype (gnat_entity))
2423 && Full_View (Etype (gnat_entity)) == gnat_entity))
2425 TYPE_ALIAS_SET (gnu_type)
2426 = get_alias_set (gnat_to_gnu_type (Etype (gnat_entity)));
2427 record_component_aliases (gnu_type);
2430 /* Fill in locations of fields. */
2431 annotate_rep (gnat_entity, gnu_type);
2433 /* If there are any entities in the chain corresponding to
2434 components that we did not elaborate, ensure we elaborate their
2435 types if they are Itypes. */
2436 for (gnat_temp = First_Entity (gnat_entity);
2437 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2438 if ((Ekind (gnat_temp) == E_Component
2439 || Ekind (gnat_temp) == E_Discriminant)
2440 && Is_Itype (Etype (gnat_temp))
2441 && ! present_gnu_tree (gnat_temp))
2442 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2446 case E_Class_Wide_Subtype:
2447 /* If an equivalent type is present, that is what we should use.
2448 Otherwise, fall through to handle this like a record subtype
2449 since it may have constraints. */
2451 if (Present (Equivalent_Type (gnat_entity)))
2453 gnu_decl = gnat_to_gnu_entity (Equivalent_Type (gnat_entity),
2459 /* ... fall through ... */
2461 case E_Record_Subtype:
2463 /* If Cloned_Subtype is Present it means this record subtype has
2464 identical layout to that type or subtype and we should use
2465 that GCC type for this one. The front end guarantees that
2466 the component list is shared. */
2467 if (Present (Cloned_Subtype (gnat_entity)))
2469 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2474 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2475 changing the type, make a new type with each field having the
2476 type of the field in the new subtype but having the position
2477 computed by transforming every discriminant reference according
2478 to the constraints. We don't see any difference between
2479 private and nonprivate type here since derivations from types should
2480 have been deferred until the completion of the private type. */
2483 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2488 defer_incomplete_level++, this_deferred = 1;
2490 /* Get the base type initially for its alignment and sizes. But
2491 if it is a padded type, we do all the other work with the
2493 gnu_type = gnu_orig_type = gnu_base_type
2494 = gnat_to_gnu_type (gnat_base_type);
2496 if (TREE_CODE (gnu_type) == RECORD_TYPE
2497 && TYPE_IS_PADDING_P (gnu_type))
2498 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
2500 if (present_gnu_tree (gnat_entity))
2506 /* When the type has discriminants, and these discriminants
2507 affect the shape of what it built, factor them in.
2509 If we are making a subtype of an Unchecked_Union (must be an
2510 Itype), just return the type.
2512 We can't just use Is_Constrained because private subtypes without
2513 discriminants of full types with discriminants with default
2514 expressions are Is_Constrained but aren't constrained! */
2516 if (IN (Ekind (gnat_base_type), Record_Kind)
2517 && ! Is_For_Access_Subtype (gnat_entity)
2518 && ! Is_Unchecked_Union (gnat_base_type)
2519 && Is_Constrained (gnat_entity)
2520 && Stored_Constraint (gnat_entity) != No_Elist
2521 && Present (Discriminant_Constraint (gnat_entity)))
2523 Entity_Id gnat_field;
2524 Entity_Id gnat_root_type;
2525 tree gnu_field_list = 0;
2527 = compute_field_positions (gnu_orig_type, NULL_TREE,
2528 size_zero_node, bitsize_zero_node,
2531 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
2535 /* If this is a derived type, we may be seeing fields from any
2536 original records, so add those positions and discriminant
2537 substitutions to our lists. */
2538 for (gnat_root_type = gnat_base_type;
2539 Underlying_Type (Etype (gnat_root_type)) != gnat_root_type;
2540 gnat_root_type = Underlying_Type (Etype (gnat_root_type)))
2543 = compute_field_positions
2544 (gnat_to_gnu_type (Etype (gnat_root_type)),
2545 gnu_pos_list, size_zero_node, bitsize_zero_node,
2548 if (Present (Parent_Subtype (gnat_root_type)))
2550 = substitution_list (Parent_Subtype (gnat_root_type),
2551 Empty, gnu_subst_list, definition);
2554 gnu_type = make_node (RECORD_TYPE);
2555 TYPE_NAME (gnu_type) = gnu_entity_id;
2556 TYPE_STUB_DECL (gnu_type)
2557 = pushdecl (build_decl (TYPE_DECL, NULL_TREE, gnu_type));
2558 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2560 for (gnat_field = First_Entity (gnat_entity);
2561 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
2562 if (Ekind (gnat_field) == E_Component
2563 || Ekind (gnat_field) == E_Discriminant)
2566 = gnat_to_gnu_entity
2567 (Original_Record_Component (gnat_field), NULL_TREE, 0);
2569 = TREE_VALUE (purpose_member (gnu_old_field,
2571 tree gnu_pos = TREE_PURPOSE (gnu_offset);
2572 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
2574 = gnat_to_gnu_type (Etype (gnat_field));
2575 tree gnu_size = TYPE_SIZE (gnu_field_type);
2576 tree gnu_new_pos = 0;
2577 unsigned int offset_align
2578 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
2582 /* If there was a component clause, the field types must be
2583 the same for the type and subtype, so copy the data from
2584 the old field to avoid recomputation here. */
2585 if (Present (Component_Clause
2586 (Original_Record_Component (gnat_field))))
2588 gnu_size = DECL_SIZE (gnu_old_field);
2589 gnu_field_type = TREE_TYPE (gnu_old_field);
2592 /* If this was a bitfield, get the size from the old field.
2593 Also ensure the type can be placed into a bitfield. */
2594 else if (DECL_BIT_FIELD (gnu_old_field))
2596 gnu_size = DECL_SIZE (gnu_old_field);
2597 if (TYPE_MODE (gnu_field_type) == BLKmode
2598 && TREE_CODE (gnu_field_type) == RECORD_TYPE
2599 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
2600 gnu_field_type = make_packable_type (gnu_field_type);
2603 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
2604 for (gnu_temp = gnu_subst_list;
2605 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2606 gnu_pos = substitute_in_expr (gnu_pos,
2607 TREE_PURPOSE (gnu_temp),
2608 TREE_VALUE (gnu_temp));
2610 /* If the size is now a constant, we can set it as the
2611 size of the field when we make it. Otherwise, we need
2612 to deal with it specially. */
2613 if (TREE_CONSTANT (gnu_pos))
2614 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
2618 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
2619 0, gnu_size, gnu_new_pos,
2620 ! DECL_NONADDRESSABLE_P (gnu_old_field));
2622 if (! TREE_CONSTANT (gnu_pos))
2624 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
2625 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
2626 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
2627 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
2628 DECL_SIZE (gnu_field) = gnu_size;
2629 DECL_SIZE_UNIT (gnu_field)
2630 = convert (sizetype,
2631 size_binop (CEIL_DIV_EXPR, gnu_size,
2632 bitsize_unit_node));
2633 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
2636 DECL_INTERNAL_P (gnu_field)
2637 = DECL_INTERNAL_P (gnu_old_field);
2638 SET_DECL_ORIGINAL_FIELD (gnu_field,
2639 (DECL_ORIGINAL_FIELD (gnu_old_field) != 0
2640 ? DECL_ORIGINAL_FIELD (gnu_old_field)
2642 DECL_DISCRIMINANT_NUMBER (gnu_field)
2643 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
2644 TREE_THIS_VOLATILE (gnu_field)
2645 = TREE_THIS_VOLATILE (gnu_old_field);
2646 TREE_CHAIN (gnu_field) = gnu_field_list;
2647 gnu_field_list = gnu_field;
2648 save_gnu_tree (gnat_field, gnu_field, 0);
2651 finish_record_type (gnu_type, nreverse (gnu_field_list), 1, 0);
2653 /* Now set the size, alignment and alias set of the new type to
2654 match that of the old one, doing any substitutions, as
2656 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2657 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
2658 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
2659 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
2660 TYPE_ALIAS_SET (gnu_type) = get_alias_set (gnu_base_type);
2661 record_component_aliases (gnu_type);
2663 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2664 for (gnu_temp = gnu_subst_list;
2665 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2666 TYPE_SIZE (gnu_type)
2667 = substitute_in_expr (TYPE_SIZE (gnu_type),
2668 TREE_PURPOSE (gnu_temp),
2669 TREE_VALUE (gnu_temp));
2671 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
2672 for (gnu_temp = gnu_subst_list;
2673 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2674 TYPE_SIZE_UNIT (gnu_type)
2675 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
2676 TREE_PURPOSE (gnu_temp),
2677 TREE_VALUE (gnu_temp));
2679 if (TYPE_ADA_SIZE (gnu_type) != 0
2680 && CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
2681 for (gnu_temp = gnu_subst_list;
2682 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2683 SET_TYPE_ADA_SIZE (gnu_type,
2684 substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
2685 TREE_PURPOSE (gnu_temp),
2686 TREE_VALUE (gnu_temp)));
2688 /* Recompute the mode of this record type now that we know its
2690 compute_record_mode (gnu_type);
2692 /* Fill in locations of fields. */
2693 annotate_rep (gnat_entity, gnu_type);
2696 /* If we've made a new type, record it and make an XVS type to show
2697 what this is a subtype of. Some debuggers require the XVS
2698 type to be output first, so do it in that order. */
2699 if (gnu_type != gnu_orig_type)
2703 tree gnu_subtype_marker = make_node (RECORD_TYPE);
2704 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
2706 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
2707 gnu_orig_name = DECL_NAME (gnu_orig_name);
2709 TYPE_NAME (gnu_subtype_marker)
2710 = create_concat_name (gnat_entity, "XVS");
2711 finish_record_type (gnu_subtype_marker,
2712 create_field_decl (gnu_orig_name,
2720 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2721 TYPE_NAME (gnu_type) = gnu_entity_id;
2722 TYPE_STUB_DECL (gnu_type)
2723 = pushdecl (build_decl (TYPE_DECL, TYPE_NAME (gnu_type),
2725 DECL_ARTIFICIAL (TYPE_STUB_DECL (gnu_type)) = 1;
2726 DECL_IGNORED_P (TYPE_STUB_DECL (gnu_type)) = ! debug_info_p;
2727 rest_of_type_compilation (gnu_type, global_bindings_p ());
2730 /* Otherwise, go down all the components in the new type and
2731 make them equivalent to those in the base type. */
2733 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
2734 gnat_temp = Next_Entity (gnat_temp))
2735 if ((Ekind (gnat_temp) == E_Discriminant
2736 && ! Is_Unchecked_Union (gnat_base_type))
2737 || Ekind (gnat_temp) == E_Component)
2738 save_gnu_tree (gnat_temp,
2740 (Original_Record_Component (gnat_temp)), 0);
2744 case E_Access_Subprogram_Type:
2745 /* If we are not defining this entity, and we have incomplete
2746 entities being processed above us, make a dummy type and
2747 fill it in later. */
2748 if (! definition && defer_incomplete_level != 0)
2750 struct incomplete *p
2751 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
2754 = build_pointer_type
2755 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
2756 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2757 ! Comes_From_Source (gnat_entity),
2759 save_gnu_tree (gnat_entity, gnu_decl, 0);
2760 this_made_decl = saved = 1;
2762 p->old_type = TREE_TYPE (gnu_type);
2763 p->full_type = Directly_Designated_Type (gnat_entity);
2764 p->next = defer_incomplete_list;
2765 defer_incomplete_list = p;
2769 /* ... fall through ... */
2771 case E_Allocator_Type:
2773 case E_Access_Attribute_Type:
2774 case E_Anonymous_Access_Type:
2775 case E_General_Access_Type:
2777 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
2778 Entity_Id gnat_desig_full
2779 = ((IN (Ekind (Etype (gnat_desig_type)),
2780 Incomplete_Or_Private_Kind))
2781 ? Full_View (gnat_desig_type) : 0);
2782 /* We want to know if we'll be seeing the freeze node for any
2783 incomplete type we may be pointing to. */
2785 = (Present (gnat_desig_full)
2786 ? In_Extended_Main_Code_Unit (gnat_desig_full)
2787 : In_Extended_Main_Code_Unit (gnat_desig_type));
2790 tree gnu_desig_type = 0;
2792 if (No (gnat_desig_full)
2793 && (Ekind (gnat_desig_type) == E_Class_Wide_Type
2794 || (Ekind (gnat_desig_type) == E_Class_Wide_Subtype
2795 && Present (Equivalent_Type (gnat_desig_type)))))
2797 if (Present (Equivalent_Type (gnat_desig_type)))
2799 gnat_desig_full = Equivalent_Type (gnat_desig_type);
2800 if (IN (Ekind (gnat_desig_full), Incomplete_Or_Private_Kind))
2801 gnat_desig_full = Full_View (gnat_desig_full);
2803 else if (IN (Ekind (Root_Type (gnat_desig_type)),
2804 Incomplete_Or_Private_Kind))
2805 gnat_desig_full = Full_View (Root_Type (gnat_desig_type));
2808 if (Present (gnat_desig_full) && Is_Concurrent_Type (gnat_desig_full))
2809 gnat_desig_full = Corresponding_Record_Type (gnat_desig_full);
2811 /* If either the designated type or its full view is an
2812 unconstrained array subtype, replace it with the type it's a
2813 subtype of. This avoids problems with multiple copies of
2814 unconstrained array types. */
2815 if (Ekind (gnat_desig_type) == E_Array_Subtype
2816 && ! Is_Constrained (gnat_desig_type))
2817 gnat_desig_type = Etype (gnat_desig_type);
2818 if (Present (gnat_desig_full)
2819 && Ekind (gnat_desig_full) == E_Array_Subtype
2820 && ! Is_Constrained (gnat_desig_full))
2821 gnat_desig_full = Etype (gnat_desig_full);
2823 /* If the designated type is a subtype of an incomplete record type,
2824 use the parent type to avoid order of elaboration issues. This
2825 can lose some code efficiency, but there is no alternative. */
2826 if (Present (gnat_desig_full)
2827 && Ekind (gnat_desig_full) == E_Record_Subtype
2828 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)
2829 gnat_desig_full = Etype (gnat_desig_full);
2831 /* If we are pointing to an incomplete type whose completion is an
2832 unconstrained array, make a fat pointer type instead of a pointer
2833 to VOID. The two types in our fields will be pointers to VOID and
2834 will be replaced in update_pointer_to. Similiarly, if the type
2835 itself is a dummy type or an unconstrained array. Also make
2836 a dummy TYPE_OBJECT_RECORD_TYPE in case we have any thin
2839 if ((Present (gnat_desig_full)
2840 && Is_Array_Type (gnat_desig_full)
2841 && ! Is_Constrained (gnat_desig_full))
2842 || (present_gnu_tree (gnat_desig_type)
2843 && TYPE_IS_DUMMY_P (TREE_TYPE
2844 (get_gnu_tree (gnat_desig_type)))
2845 && Is_Array_Type (gnat_desig_type)
2846 && ! Is_Constrained (gnat_desig_type))
2847 || (present_gnu_tree (gnat_desig_type)
2848 && (TREE_CODE (TREE_TYPE (get_gnu_tree (gnat_desig_type)))
2849 == UNCONSTRAINED_ARRAY_TYPE)
2850 && (TYPE_POINTER_TO (TREE_TYPE
2851 (get_gnu_tree (gnat_desig_type)))
2853 || (No (gnat_desig_full) && ! in_main_unit
2854 && defer_incomplete_level != 0
2855 && ! present_gnu_tree (gnat_desig_type)
2856 && Is_Array_Type (gnat_desig_type)
2857 && ! Is_Constrained (gnat_desig_type)))
2860 = (present_gnu_tree (gnat_desig_type)
2861 ? gnat_to_gnu_type (gnat_desig_type)
2862 : make_dummy_type (gnat_desig_type));
2865 /* Show the dummy we get will be a fat pointer. */
2866 got_fat_p = made_dummy = 1;
2868 /* If the call above got something that has a pointer, that
2869 pointer is our type. This could have happened either
2870 because the type was elaborated or because somebody
2871 else executed the code below. */
2872 gnu_type = TYPE_POINTER_TO (gnu_old);
2875 gnu_type = make_node (RECORD_TYPE);
2876 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
2877 TYPE_POINTER_TO (gnu_old) = gnu_type;
2879 set_lineno (gnat_entity, 0);
2881 = chainon (chainon (NULL_TREE,
2883 (get_identifier ("P_ARRAY"),
2884 ptr_void_type_node, gnu_type,
2886 create_field_decl (get_identifier ("P_BOUNDS"),
2888 gnu_type, 0, 0, 0, 0));
2890 /* Make sure we can place this into a register. */
2891 TYPE_ALIGN (gnu_type)
2892 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
2893 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
2894 finish_record_type (gnu_type, fields, 0, 1);
2896 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
2897 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
2898 = concat_id_with_name (get_entity_name (gnat_desig_type),
2900 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
2904 /* If we already know what the full type is, use it. */
2905 else if (Present (gnat_desig_full)
2906 && present_gnu_tree (gnat_desig_full))
2907 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
2909 /* Get the type of the thing we are to point to and build a pointer
2910 to it. If it is a reference to an incomplete or private type with a
2911 full view that is a record, make a dummy type node and get the
2912 actual type later when we have verified it is safe. */
2913 else if (! in_main_unit
2914 && ! present_gnu_tree (gnat_desig_type)
2915 && Present (gnat_desig_full)
2916 && ! present_gnu_tree (gnat_desig_full)
2917 && Is_Record_Type (gnat_desig_full))
2919 gnu_desig_type = make_dummy_type (gnat_desig_type);
2923 /* Likewise if we are pointing to a record or array and we are to defer
2924 elaborating incomplete types. We do this since this access type
2925 may be the full view of some private type. Note that the
2926 unconstrained array case is handled above. */
2927 else if ((! in_main_unit || imported_p) && defer_incomplete_level != 0
2928 && ! present_gnu_tree (gnat_desig_type)
2929 && ((Is_Record_Type (gnat_desig_type)
2930 || Is_Array_Type (gnat_desig_type))
2931 || (Present (gnat_desig_full)
2932 && (Is_Record_Type (gnat_desig_full)
2933 || Is_Array_Type (gnat_desig_full)))))
2935 gnu_desig_type = make_dummy_type (gnat_desig_type);
2938 else if (gnat_desig_type == gnat_entity)
2940 gnu_type = build_pointer_type (make_node (VOID_TYPE));
2941 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
2944 gnu_desig_type = gnat_to_gnu_type (gnat_desig_type);
2946 /* It is possible that the above call to gnat_to_gnu_type resolved our
2947 type. If so, just return it. */
2948 if (present_gnu_tree (gnat_entity))
2954 /* If we have a GCC type for the designated type, possibly modify it
2955 if we are pointing only to constant objects and then make a pointer
2956 to it. Don't do this for unconstrained arrays. */
2957 if (gnu_type == 0 && gnu_desig_type != 0)
2959 if (Is_Access_Constant (gnat_entity)
2960 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
2963 = build_qualified_type
2965 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
2967 /* Some extra processing is required if we are building a
2968 pointer to an incomplete type (in the GCC sense). We might
2969 have such a type if we just made a dummy, or directly out
2970 of the call to gnat_to_gnu_type above if we are processing
2971 an access type for a record component designating the
2972 record type itself. */
2973 if (! COMPLETE_TYPE_P (gnu_desig_type))
2975 /* We must ensure that the pointer to variant we make will
2976 be processed by update_pointer_to when the initial type
2977 is completed. Pretend we made a dummy and let further
2978 processing act as usual. */
2981 /* We must ensure that update_pointer_to will not retrieve
2982 the dummy variant when building a properly qualified
2983 version of the complete type. We take advantage of the
2984 fact that get_qualified_type is requiring TYPE_NAMEs to
2985 match to influence build_qualified_type and then also
2986 update_pointer_to here. */
2987 TYPE_NAME (gnu_desig_type)
2988 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
2992 gnu_type = build_pointer_type (gnu_desig_type);
2995 /* If we are not defining this object and we made a dummy pointer,
2996 save our current definition, evaluate the actual type, and replace
2997 the tentative type we made with the actual one. If we are to defer
2998 actually looking up the actual type, make an entry in the
3001 if (! in_main_unit && made_dummy)
3004 = TYPE_FAT_POINTER_P (gnu_type)
3005 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3007 if (esize == POINTER_SIZE
3008 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3010 = build_pointer_type
3011 (TYPE_OBJECT_RECORD_TYPE
3012 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3014 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3015 ! Comes_From_Source (gnat_entity),
3017 save_gnu_tree (gnat_entity, gnu_decl, 0);
3018 this_made_decl = saved = 1;
3020 if (defer_incomplete_level == 0)
3022 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3023 gnat_to_gnu_type (gnat_desig_type));
3024 /* Note that the call to gnat_to_gnu_type here might have
3025 updated gnu_old_type directly, in which case it is not a
3026 dummy type any more when we get into update_pointer_to.
3028 This may happen for instance when the designated type is a
3029 record type, because their elaboration starts with an
3030 initial node from make_dummy_type, which may yield the same
3031 node as the one we got.
3033 Besides, variants of this non-dummy type might have been
3034 created along the way. update_pointer_to is expected to
3035 properly take care of those situations. */
3039 struct incomplete *p
3040 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3042 p->old_type = gnu_old_type;
3043 p->full_type = gnat_desig_type;
3044 p->next = defer_incomplete_list;
3045 defer_incomplete_list = p;
3051 case E_Access_Protected_Subprogram_Type:
3052 if (type_annotate_only && No (Equivalent_Type (gnat_entity)))
3053 gnu_type = build_pointer_type (void_type_node);
3055 /* The runtime representation is the equivalent type. */
3056 gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
3058 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3059 && ! present_gnu_tree (Directly_Designated_Type (gnat_entity))
3060 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3061 && ! Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3062 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3067 case E_Access_Subtype:
3069 /* We treat this as identical to its base type; any constraint is
3070 meaningful only to the front end.
3072 The designated type must be elaborated as well, if it does
3073 not have its own freeze node. Designated (sub)types created
3074 for constrained components of records with discriminants are
3075 not frozen by the front end and thus not elaborated by gigi,
3076 because their use may appear before the base type is frozen,
3077 and because it is not clear that they are needed anywhere in
3078 Gigi. With the current model, there is no correct place where
3079 they could be elaborated. */
3081 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3082 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3083 && ! present_gnu_tree (Directly_Designated_Type (gnat_entity))
3084 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3085 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3087 /* If we are not defining this entity, and we have incomplete
3088 entities being processed above us, make a dummy type and
3089 elaborate it later. */
3090 if (! definition && defer_incomplete_level != 0)
3092 struct incomplete *p
3093 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3095 = build_pointer_type
3096 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3098 p->old_type = TREE_TYPE (gnu_ptr_type);
3099 p->full_type = Directly_Designated_Type (gnat_entity);
3100 p->next = defer_incomplete_list;
3101 defer_incomplete_list = p;
3104 (IN (Ekind (Base_Type (Directly_Designated_Type (gnat_entity))),
3105 Incomplete_Or_Private_Kind))
3108 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3115 /* Subprogram Entities
3117 The following access functions are defined for subprograms (functions
3120 First_Formal The first formal parameter.
3121 Is_Imported Indicates that the subprogram has appeared in
3122 an INTERFACE or IMPORT pragma. For now we
3123 assume that the external language is C.
3124 Is_Inlined True if the subprogram is to be inlined.
3126 In addition for function subprograms we have:
3128 Etype Return type of the function.
3130 Each parameter is first checked by calling must_pass_by_ref on its
3131 type to determine if it is passed by reference. For parameters which
3132 are copied in, if they are Ada IN OUT or OUT parameters, their return
3133 value becomes part of a record which becomes the return type of the
3134 function (C function - note that this applies only to Ada procedures
3135 so there is no Ada return type). Additional code to store back the
3136 parameters will be generated on the caller side. This transformation
3137 is done here, not in the front-end.
3139 The intended result of the transformation can be seen from the
3140 equivalent source rewritings that follow:
3142 struct temp {int a,b};
3143 procedure P (A,B: IN OUT ...) is temp P (int A,B) {
3145 end P; return {A,B};
3155 For subprogram types we need to perform mainly the same conversions to
3156 GCC form that are needed for procedures and function declarations. The
3157 only difference is that at the end, we make a type declaration instead
3158 of a function declaration. */
3160 case E_Subprogram_Type:
3164 /* The first GCC parameter declaration (a PARM_DECL node). The
3165 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3166 actually is the head of this parameter list. */
3167 tree gnu_param_list = NULL_TREE;
3168 /* The type returned by a function. If the subprogram is a procedure
3169 this type should be void_type_node. */
3170 tree gnu_return_type = void_type_node;
3171 /* List of fields in return type of procedure with copy in copy out
3173 tree gnu_field_list = NULL_TREE;
3174 /* Non-null for subprograms containing parameters passed by copy in
3175 copy out (Ada IN OUT or OUT parameters not passed by reference),
3176 in which case it is the list of nodes used to specify the values of
3177 the in out/out parameters that are returned as a record upon
3178 procedure return. The TREE_PURPOSE of an element of this list is
3179 a field of the record and the TREE_VALUE is the PARM_DECL
3180 corresponding to that field. This list will be saved in the
3181 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3182 tree gnu_return_list = NULL_TREE;
3183 Entity_Id gnat_param;
3184 int inline_flag = Is_Inlined (gnat_entity);
3185 int public_flag = Is_Public (gnat_entity);
3187 = (Is_Public (gnat_entity) && !definition) || imported_p;
3188 int pure_flag = Is_Pure (gnat_entity);
3189 int volatile_flag = No_Return (gnat_entity);
3190 int returns_by_ref = 0;
3191 int returns_unconstrained = 0;
3192 tree gnu_ext_name = create_concat_name (gnat_entity, 0);
3193 int has_copy_in_out = 0;
3196 if (kind == E_Subprogram_Type && ! definition)
3197 /* A parameter may refer to this type, so defer completion
3198 of any incomplete types. */
3199 defer_incomplete_level++, this_deferred = 1;
3201 /* If the subprogram has an alias, it is probably inherited, so
3202 we can use the original one. If the original "subprogram"
3203 is actually an enumeration literal, it may be the first use
3204 of its type, so we must elaborate that type now. */
3205 if (Present (Alias (gnat_entity)))
3207 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3208 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3210 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3213 /* Elaborate any Itypes in the parameters of this entity. */
3214 for (gnat_temp = First_Formal (gnat_entity);
3215 Present (gnat_temp);
3216 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3217 if (Is_Itype (Etype (gnat_temp)))
3218 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3223 if (kind == E_Function || kind == E_Subprogram_Type)
3224 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3226 /* If this function returns by reference, make the actual
3227 return type of this function the pointer and mark the decl. */
3228 if (Returns_By_Ref (gnat_entity))
3231 gnu_return_type = build_pointer_type (gnu_return_type);
3234 /* If the Mechanism is By_Reference, ensure the return type uses
3235 the machine's by-reference mechanism, which may not the same
3236 as above (e.g., it might be by passing a fake parameter). */
3237 else if (kind == E_Function
3238 && Mechanism (gnat_entity) == By_Reference)
3240 gnu_return_type = copy_type (gnu_return_type);
3241 TREE_ADDRESSABLE (gnu_return_type) = 1;
3244 /* If we are supposed to return an unconstrained array,
3245 actually return a fat pointer and make a note of that. Return
3246 a pointer to an unconstrained record of variable size. */
3247 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3249 gnu_return_type = TREE_TYPE (gnu_return_type);
3250 returns_unconstrained = 1;
3253 /* If the type requires a transient scope, the result is allocated
3254 on the secondary stack, so the result type of the function is
3256 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3258 gnu_return_type = build_pointer_type (gnu_return_type);
3259 returns_unconstrained = 1;
3262 /* If the type is a padded type and the underlying type would not
3263 be passed by reference or this function has a foreign convention,
3264 return the underlying type. */
3265 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3266 && TYPE_IS_PADDING_P (gnu_return_type)
3267 && (! default_pass_by_ref (TREE_TYPE
3268 (TYPE_FIELDS (gnu_return_type)))
3269 || Has_Foreign_Convention (gnat_entity)))
3270 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3272 /* Look at all our parameters and get the type of
3273 each. While doing this, build a copy-out structure if
3276 for (gnat_param = First_Formal (gnat_entity), parmnum = 0;
3277 Present (gnat_param);
3278 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3280 tree gnu_param_name = get_entity_name (gnat_param);
3281 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3282 tree gnu_param, gnu_field;
3285 int by_component_ptr_p = 0;
3286 int copy_in_copy_out_flag = 0;
3287 int req_by_copy = 0, req_by_ref = 0;
3289 /* See if a Mechanism was supplied that forced this
3290 parameter to be passed one way or another. */
3291 if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3293 else if (Mechanism (gnat_param) == Default)
3295 else if (Mechanism (gnat_param) == By_Copy)
3297 else if (Mechanism (gnat_param) == By_Reference)
3299 else if (Mechanism (gnat_param) <= By_Descriptor)
3301 else if (Mechanism (gnat_param) > 0)
3303 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
3304 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
3305 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
3306 Mechanism (gnat_param)))
3312 post_error ("unsupported mechanism for&", gnat_param);
3314 /* If this is either a foreign function or if the
3315 underlying type won't be passed by refererence, strip off
3316 possible padding type. */
3317 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
3318 && TYPE_IS_PADDING_P (gnu_param_type)
3319 && (req_by_ref || Has_Foreign_Convention (gnat_entity)
3320 || ! must_pass_by_ref (TREE_TYPE (TYPE_FIELDS
3321 (gnu_param_type)))))
3322 gnu_param_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
3324 /* If this is an IN parameter it is read-only, so make a variant
3325 of the type that is read-only.
3327 ??? However, if this is an unconstrained array, that type can
3328 be very complex. So skip it for now. Likewise for any other
3329 self-referential type. */
3330 if (Ekind (gnat_param) == E_In_Parameter
3331 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
3332 && ! (TYPE_SIZE (gnu_param_type) != 0
3333 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))))
3335 = build_qualified_type (gnu_param_type,
3336 (TYPE_QUALS (gnu_param_type)
3337 | TYPE_QUAL_CONST));
3339 /* For foreign conventions, pass arrays as a pointer to the
3340 underlying type. First check for unconstrained array and get
3341 the underlying array. Then get the component type and build
3343 if (Has_Foreign_Convention (gnat_entity)
3344 && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
3346 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS
3347 (TREE_TYPE (gnu_param_type))));
3351 = build_pointer_type
3352 (build_vms_descriptor (gnu_param_type,
3353 Mechanism (gnat_param),
3356 else if (Has_Foreign_Convention (gnat_entity)
3358 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
3360 /* Strip off any multi-dimensional entries, then strip
3361 off the last array to get the component type. */
3362 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
3363 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
3364 gnu_param_type = TREE_TYPE (gnu_param_type);
3366 by_component_ptr_p = 1;
3367 gnu_param_type = TREE_TYPE (gnu_param_type);
3369 if (Ekind (gnat_param) == E_In_Parameter)
3371 = build_qualified_type (gnu_param_type,
3372 (TYPE_QUALS (gnu_param_type)
3373 | TYPE_QUAL_CONST));
3375 gnu_param_type = build_pointer_type (gnu_param_type);
3378 /* Fat pointers are passed as thin pointers for foreign
3380 else if (Has_Foreign_Convention (gnat_entity)
3381 && TYPE_FAT_POINTER_P (gnu_param_type))
3383 = make_type_from_size (gnu_param_type,
3384 size_int (POINTER_SIZE), 0);
3386 /* If we must pass or were requested to pass by reference, do so.
3387 If we were requested to pass by copy, do so.
3388 Otherwise, for foreign conventions, pass all in out parameters
3389 or aggregates by reference. For COBOL and Fortran, pass
3390 all integer and FP types that way too. For Convention Ada,
3391 use the standard Ada default. */
3392 else if (must_pass_by_ref (gnu_param_type) || req_by_ref
3394 && ((Has_Foreign_Convention (gnat_entity)
3395 && (Ekind (gnat_param) != E_In_Parameter
3396 || AGGREGATE_TYPE_P (gnu_param_type)))
3397 || (((Convention (gnat_entity)
3398 == Convention_Fortran)
3399 || (Convention (gnat_entity)
3400 == Convention_COBOL))
3401 && (INTEGRAL_TYPE_P (gnu_param_type)
3402 || FLOAT_TYPE_P (gnu_param_type)))
3403 /* For convention Ada, see if we pass by reference
3405 || (! Has_Foreign_Convention (gnat_entity)
3406 && default_pass_by_ref (gnu_param_type)))))
3408 gnu_param_type = build_reference_type (gnu_param_type);
3412 else if (Ekind (gnat_param) != E_In_Parameter)
3413 copy_in_copy_out_flag = 1;
3415 if (req_by_copy && (by_ref_p || by_component_ptr_p))
3416 post_error ("?cannot pass & by copy", gnat_param);
3418 /* If this is an OUT parameter that isn't passed by reference
3419 and isn't a pointer or aggregate, we don't make a PARM_DECL
3420 for it. Instead, it will be a VAR_DECL created when we process
3421 the procedure. For the special parameter of Valued_Procedure,
3424 An exception is made to cover the RM-6.4.1 rule requiring "by
3425 copy" out parameters with discriminants or implicit initial
3426 values to be handled like in out parameters. These type are
3427 normally built as aggregates, and hence passed by reference,
3428 except for some packed arrays which end up encoded in special
3431 The exception we need to make is then for packed arrays of
3432 records with discriminants or implicit initial values. We have
3433 no light/easy way to check for the latter case, so we merely
3434 check for packed arrays of records. This may lead to useless
3435 copy-in operations, but in very rare cases only, as these would
3436 be exceptions in a set of already exceptional situations. */
3437 if (Ekind (gnat_param) == E_Out_Parameter && ! by_ref_p
3438 && ((Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3440 && ! POINTER_TYPE_P (gnu_param_type)
3441 && ! AGGREGATE_TYPE_P (gnu_param_type)))
3442 && ! (Is_Array_Type (Etype (gnat_param))
3443 && Is_Packed (Etype (gnat_param))
3444 && Is_Composite_Type (Component_Type
3445 (Etype (gnat_param)))))
3449 set_lineno (gnat_param, 0);
3452 (gnu_param_name, gnu_param_type,
3453 by_ref_p || by_component_ptr_p
3454 || Ekind (gnat_param) == E_In_Parameter);
3456 DECL_BY_REF_P (gnu_param) = by_ref_p;
3457 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr_p;
3458 DECL_BY_DESCRIPTOR_P (gnu_param) = by_descr_p;
3459 DECL_POINTS_TO_READONLY_P (gnu_param)
3460 = (Ekind (gnat_param) == E_In_Parameter
3461 && (by_ref_p || by_component_ptr_p));
3462 save_gnu_tree (gnat_param, gnu_param, 0);
3463 gnu_param_list = chainon (gnu_param, gnu_param_list);
3465 /* If a parameter is a pointer, this function may modify
3466 memory through it and thus shouldn't be considered
3467 a pure function. Also, the memory may be modified
3468 between two calls, so they can't be CSE'ed. The latter
3469 case also handles by-ref parameters. */
3470 if (POINTER_TYPE_P (gnu_param_type)
3471 || TYPE_FAT_POINTER_P (gnu_param_type))
3475 if (copy_in_copy_out_flag)
3477 if (! has_copy_in_out)
3479 if (TREE_CODE (gnu_return_type) != VOID_TYPE)
3482 gnu_return_type = make_node (RECORD_TYPE);
3483 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
3484 has_copy_in_out = 1;
3487 set_lineno (gnat_param, 0);
3488 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
3489 gnu_return_type, 0, 0, 0, 0);
3490 TREE_CHAIN (gnu_field) = gnu_field_list;
3491 gnu_field_list = gnu_field;
3492 gnu_return_list = tree_cons (gnu_field, gnu_param,
3497 /* Do not compute record for out parameters if subprogram is
3498 stubbed since structures are incomplete for the back-end. */
3499 if (gnu_field_list != 0
3500 && Convention (gnat_entity) != Convention_Stubbed)
3501 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
3504 /* If we have a CICO list but it has only one entry, we convert
3505 this function into a function that simply returns that one
3507 if (list_length (gnu_return_list) == 1)
3508 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
3511 if (Convention (gnat_entity) == Convention_Stdcall)
3514 = (struct attrib *) xmalloc (sizeof (struct attrib));
3516 attr->next = attr_list;
3517 attr->type = ATTR_MACHINE_ATTRIBUTE;
3518 attr->name = get_identifier ("stdcall");
3519 attr->arg = NULL_TREE;
3520 attr->error_point = gnat_entity;
3525 /* Both lists ware built in reverse. */
3526 gnu_param_list = nreverse (gnu_param_list);
3527 gnu_return_list = nreverse (gnu_return_list);
3530 = create_subprog_type (gnu_return_type, gnu_param_list,
3531 gnu_return_list, returns_unconstrained,
3533 Function_Returns_With_DSP (gnat_entity));
3535 /* ??? For now, don't consider nested functions pure. */
3536 if (! global_bindings_p ())
3539 /* A subprogram (something that doesn't return anything) shouldn't
3540 be considered Pure since there would be no reason for such a
3541 subprogram. Note that procedures with Out (or In Out) parameters
3542 have already been converted into a function with a return type. */
3543 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
3547 = build_qualified_type (gnu_type,
3548 (TYPE_QUALS (gnu_type)
3549 | (TYPE_QUAL_CONST * pure_flag)
3550 | (TYPE_QUAL_VOLATILE * volatile_flag)));
3552 set_lineno (gnat_entity, 0);
3554 /* If there was no specified Interface_Name and the external and
3555 internal names of the subprogram are the same, only use the
3556 internal name to allow disambiguation of nested subprograms. */
3557 if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_id)
3560 /* If we are defining the subprogram and it has an Address clause
3561 we must get the address expression from the saved GCC tree for the
3562 subprogram if it has a Freeze_Node. Otherwise, we elaborate
3563 the address expression here since the front-end has guaranteed
3564 in that case that the elaboration has no effects. If there is
3565 an Address clause and we are not defining the object, just
3566 make it a constant. */
3567 if (Present (Address_Clause (gnat_entity)))
3569 tree gnu_address = 0;
3573 = (present_gnu_tree (gnat_entity)
3574 ? get_gnu_tree (gnat_entity)
3575 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
3577 save_gnu_tree (gnat_entity, NULL_TREE, 0);
3579 gnu_type = build_reference_type (gnu_type);
3580 if (gnu_address != 0)
3581 gnu_address = convert (gnu_type, gnu_address);
3584 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
3585 gnu_address, 0, Is_Public (gnat_entity),
3587 DECL_BY_REF_P (gnu_decl) = 1;
3590 else if (kind == E_Subprogram_Type)
3591 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3592 ! Comes_From_Source (gnat_entity),
3596 gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name,
3597 gnu_type, gnu_param_list,
3598 inline_flag, public_flag,
3599 extern_flag, attr_list);
3600 DECL_STUBBED_P (gnu_decl)
3601 = Convention (gnat_entity) == Convention_Stubbed;
3606 case E_Incomplete_Type:
3607 case E_Private_Type:
3608 case E_Limited_Private_Type:
3609 case E_Record_Type_With_Private:
3610 case E_Private_Subtype:
3611 case E_Limited_Private_Subtype:
3612 case E_Record_Subtype_With_Private:
3614 /* If this type does not have a full view in the unit we are
3615 compiling, then just get the type from its Etype. */
3616 if (No (Full_View (gnat_entity)))
3618 /* If this is an incomplete type with no full view, it must
3619 be a Taft Amendement type, so just return a dummy type. */
3620 if (kind == E_Incomplete_Type)
3621 gnu_type = make_dummy_type (gnat_entity);
3623 else if (Present (Underlying_Full_View (gnat_entity)))
3624 gnu_decl = gnat_to_gnu_entity (Underlying_Full_View (gnat_entity),
3628 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
3636 /* Otherwise, if we are not defining the type now, get the
3637 type from the full view. But always get the type from the full
3638 view for define on use types, since otherwise we won't see them! */
3640 else if (! definition
3641 || (Is_Itype (Full_View (gnat_entity))
3642 && No (Freeze_Node (gnat_entity)))
3643 || (Is_Itype (gnat_entity)
3644 && No (Freeze_Node (Full_View (gnat_entity)))))
3646 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
3652 /* For incomplete types, make a dummy type entry which will be
3654 gnu_type = make_dummy_type (gnat_entity);
3656 /* Save this type as the full declaration's type so we can do any needed
3657 updates when we see it. */
3658 set_lineno (gnat_entity, 0);
3659 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3660 ! Comes_From_Source (gnat_entity),
3662 save_gnu_tree (Full_View (gnat_entity), gnu_decl, 0);
3665 /* Simple class_wide types are always viewed as their root_type
3666 by Gigi unless an Equivalent_Type is specified. */
3667 case E_Class_Wide_Type:
3668 if (Present (Equivalent_Type (gnat_entity)))
3669 gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
3671 gnu_type = gnat_to_gnu_type (Root_Type (gnat_entity));
3677 case E_Task_Subtype:
3678 case E_Protected_Type:
3679 case E_Protected_Subtype:
3680 if (type_annotate_only && No (Corresponding_Record_Type (gnat_entity)))
3681 gnu_type = void_type_node;
3683 gnu_type = gnat_to_gnu_type (Corresponding_Record_Type (gnat_entity));
3689 gnu_decl = create_label_decl (gnu_entity_id);
3694 /* Nothing at all to do here, so just return an ERROR_MARK and claim
3695 we've already saved it, so we don't try to. */
3696 gnu_decl = error_mark_node;
3704 /* If we had a case where we evaluated another type and it might have
3705 defined this one, handle it here. */
3706 if (maybe_present && present_gnu_tree (gnat_entity))
3708 gnu_decl = get_gnu_tree (gnat_entity);
3712 /* If we are processing a type and there is either no decl for it or
3713 we just made one, do some common processing for the type, such as
3714 handling alignment and possible padding. */
3716 if ((gnu_decl == 0 || this_made_decl) && IN (kind, Type_Kind))
3718 if (Is_Tagged_Type (gnat_entity)
3719 || Is_Class_Wide_Equivalent_Type (gnat_entity))
3720 TYPE_ALIGN_OK (gnu_type) = 1;
3722 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
3723 TYPE_BY_REFERENCE_P (gnu_type) = 1;
3725 /* ??? Don't set the size for a String_Literal since it is either
3726 confirming or we don't handle it properly (if the low bound is
3728 if (gnu_size == 0 && kind != E_String_Literal_Subtype)
3729 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
3730 TYPE_DECL, 0, Has_Size_Clause (gnat_entity));
3732 /* If a size was specified, see if we can make a new type of that size
3733 by rearranging the type, for example from a fat to a thin pointer. */
3737 = make_type_from_size (gnu_type, gnu_size,
3738 Has_Biased_Representation (gnat_entity));
3740 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
3741 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
3745 /* If the alignment hasn't already been processed and this is
3746 not an unconstrained array, see if an alignment is specified.
3747 If not, we pick a default alignment for atomic objects. */
3748 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
3750 else if (Known_Alignment (gnat_entity))
3751 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
3752 TYPE_ALIGN (gnu_type));
3753 else if (Is_Atomic (gnat_entity) && gnu_size == 0
3754 && host_integerp (TYPE_SIZE (gnu_type), 1)
3755 && integer_pow2p (TYPE_SIZE (gnu_type)))
3756 align = MIN (BIGGEST_ALIGNMENT,
3757 tree_low_cst (TYPE_SIZE (gnu_type), 1));
3758 else if (Is_Atomic (gnat_entity) && gnu_size != 0
3759 && host_integerp (gnu_size, 1)
3760 && integer_pow2p (gnu_size))
3761 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
3763 /* See if we need to pad the type. If we did, and made a record,
3764 the name of the new type may be changed. So get it back for
3765 us when we make the new TYPE_DECL below. */
3766 gnu_type = maybe_pad_type (gnu_type, gnu_size, align,
3767 gnat_entity, "PAD", 1, definition, 0);
3768 if (TREE_CODE (gnu_type) == RECORD_TYPE
3769 && TYPE_IS_PADDING_P (gnu_type))
3771 gnu_entity_id = TYPE_NAME (gnu_type);
3772 if (TREE_CODE (gnu_entity_id) == TYPE_DECL)
3773 gnu_entity_id = DECL_NAME (gnu_entity_id);
3776 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
3778 /* If we are at global level, GCC will have applied variable_size to
3779 the type, but that won't have done anything. So, if it's not
3780 a constant or self-referential, call elaborate_expression_1 to
3781 make a variable for the size rather than calculating it each time.
3782 Handle both the RM size and the actual size. */
3783 if (global_bindings_p ()
3784 && TYPE_SIZE (gnu_type) != 0
3785 && ! TREE_CONSTANT (TYPE_SIZE (gnu_type))
3786 && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3788 if (TREE_CODE (gnu_type) == RECORD_TYPE
3789 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
3790 TYPE_SIZE (gnu_type), 0))
3792 TYPE_SIZE (gnu_type)
3793 = elaborate_expression_1 (gnat_entity, gnat_entity,
3794 TYPE_SIZE (gnu_type),
3795 get_identifier ("SIZE"),
3797 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
3801 TYPE_SIZE (gnu_type)
3802 = elaborate_expression_1 (gnat_entity, gnat_entity,
3803 TYPE_SIZE (gnu_type),
3804 get_identifier ("SIZE"),
3807 /* ??? For now, store the size as a multiple of the alignment
3808 in bytes so that we can see the alignment from the tree. */
3809 TYPE_SIZE_UNIT (gnu_type)
3811 (MULT_EXPR, sizetype,
3812 elaborate_expression_1
3813 (gnat_entity, gnat_entity,
3814 build_binary_op (EXACT_DIV_EXPR, sizetype,
3815 TYPE_SIZE_UNIT (gnu_type),
3816 size_int (TYPE_ALIGN (gnu_type)
3818 get_identifier ("SIZE_A_UNIT"),
3820 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
3822 if (TREE_CODE (gnu_type) == RECORD_TYPE)
3823 SET_TYPE_ADA_SIZE (gnu_type,
3824 elaborate_expression_1 (gnat_entity, gnat_entity,
3825 TYPE_ADA_SIZE (gnu_type),
3826 get_identifier ("RM_SIZE"),
3831 /* If this is a record type or subtype, call elaborate_expression_1 on
3832 any field position. Do this for both global and local types.
3833 Skip any fields that we haven't made trees for to avoid problems with
3834 class wide types. */
3835 if (IN (kind, Record_Kind))
3836 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3837 gnat_temp = Next_Entity (gnat_temp))
3838 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
3840 tree gnu_field = get_gnu_tree (gnat_temp);
3842 /* ??? Unfortunately, GCC needs to be able to prove the
3843 alignment of this offset and if it's a variable, it can't.
3844 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
3845 right now, we have to put in an explicit multiply and
3846 divide by that value. */
3847 if (! CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
3848 DECL_FIELD_OFFSET (gnu_field)
3850 (MULT_EXPR, sizetype,
3851 elaborate_expression_1
3852 (gnat_temp, gnat_temp,
3853 build_binary_op (EXACT_DIV_EXPR, sizetype,
3854 DECL_FIELD_OFFSET (gnu_field),
3855 size_int (DECL_OFFSET_ALIGN (gnu_field)
3857 get_identifier ("OFFSET"),
3859 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
3862 gnu_type = build_qualified_type (gnu_type,
3863 (TYPE_QUALS (gnu_type)
3864 | (TYPE_QUAL_VOLATILE
3865 * Treat_As_Volatile (gnat_entity))));
3867 if (Is_Atomic (gnat_entity))
3868 check_ok_for_atomic (gnu_type, gnat_entity, 0);
3870 if (Known_Alignment (gnat_entity))
3871 TYPE_USER_ALIGN (gnu_type) = 1;
3875 set_lineno (gnat_entity, 0);
3876 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3877 ! Comes_From_Source (gnat_entity),
3881 TREE_TYPE (gnu_decl) = gnu_type;
3884 if (IN (kind, Type_Kind) && ! TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
3886 gnu_type = TREE_TYPE (gnu_decl);
3888 /* Back-annotate the Alignment of the type if not already in the
3889 tree. Likewise for sizes. */
3890 if (Unknown_Alignment (gnat_entity))
3891 Set_Alignment (gnat_entity,
3892 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
3894 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type) != 0)
3896 /* If the size is self-referential, we annotate the maximum
3897 value of that size. */
3898 tree gnu_size = TYPE_SIZE (gnu_type);
3900 if (CONTAINS_PLACEHOLDER_P (gnu_size))
3901 gnu_size = max_size (gnu_size, 1);
3903 Set_Esize (gnat_entity, annotate_value (gnu_size));
3905 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
3907 /* In this mode the tag and the parent components are not
3908 generated by the front-end, so the sizes must be adjusted
3914 if (Is_Derived_Type (gnat_entity))
3917 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
3918 Set_Alignment (gnat_entity,
3919 Alignment (Etype (Base_Type (gnat_entity))));
3922 size_offset = POINTER_SIZE;
3924 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
3925 Set_Esize (gnat_entity,
3926 UI_From_Int (((new_size + (POINTER_SIZE - 1))
3927 / POINTER_SIZE) * POINTER_SIZE));
3928 Set_RM_Size (gnat_entity, Esize (gnat_entity));
3932 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type) != 0)
3933 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
3936 if (! Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
3937 DECL_ARTIFICIAL (gnu_decl) = 1;
3939 if (! debug_info_p && DECL_P (gnu_decl)
3940 && TREE_CODE (gnu_decl) != FUNCTION_DECL)
3941 DECL_IGNORED_P (gnu_decl) = 1;
3943 /* If this decl is really indirect, adjust it. */
3944 if (TREE_CODE (gnu_decl) == VAR_DECL)
3945 adjust_decl_rtl (gnu_decl);
3947 /* If we haven't already, associate the ..._DECL node that we just made with
3948 the input GNAT entity node. */
3950 save_gnu_tree (gnat_entity, gnu_decl, 0);
3952 /* If this is an enumeral or floating-point type, we were not able to set
3953 the bounds since they refer to the type. These bounds are always static.
3955 For enumeration types, also write debugging information and declare the
3956 enumeration literal table, if needed. */
3958 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
3959 || (kind == E_Floating_Point_Type && ! Vax_Float (gnat_entity)))
3961 tree gnu_scalar_type = gnu_type;
3963 /* If this is a padded type, we need to use the underlying type. */
3964 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
3965 && TYPE_IS_PADDING_P (gnu_scalar_type))
3966 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
3968 /* If this is a floating point type and we haven't set a floating
3969 point type yet, use this in the evaluation of the bounds. */
3970 if (longest_float_type_node == 0 && kind == E_Floating_Point_Type)
3971 longest_float_type_node = gnu_type;
3973 TYPE_MIN_VALUE (gnu_scalar_type)
3974 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
3975 TYPE_MAX_VALUE (gnu_scalar_type)
3976 = gnat_to_gnu (Type_High_Bound (gnat_entity));
3978 if (kind == E_Enumeration_Type)
3980 TYPE_STUB_DECL (gnu_scalar_type) = gnu_decl;
3982 /* Since this has both a typedef and a tag, avoid outputting
3984 DECL_ARTIFICIAL (gnu_decl) = 1;
3985 rest_of_type_compilation (gnu_scalar_type, global_bindings_p ());
3989 /* If we deferred processing of incomplete types, re-enable it. If there
3990 were no other disables and we have some to process, do so. */
3991 if (this_deferred && --defer_incomplete_level == 0
3992 && defer_incomplete_list != 0)
3994 struct incomplete *incp = defer_incomplete_list;
3995 struct incomplete *next;
3997 defer_incomplete_list = 0;
3998 for (; incp; incp = next)
4002 if (incp->old_type != 0)
4003 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4004 gnat_to_gnu_type (incp->full_type));
4009 /* If we are not defining this type, see if it's in the incomplete list.
4010 If so, handle that list entry now. */
4011 else if (! definition)
4013 struct incomplete *incp;
4015 for (incp = defer_incomplete_list; incp; incp = incp->next)
4016 if (incp->old_type != 0 && incp->full_type == gnat_entity)
4018 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4019 TREE_TYPE (gnu_decl));
4027 if (Is_Packed_Array_Type (gnat_entity)
4028 && Is_Itype (Associated_Node_For_Itype (gnat_entity))
4029 && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity)))
4030 && ! present_gnu_tree (Associated_Node_For_Itype (gnat_entity)))
4031 gnat_to_gnu_entity (Associated_Node_For_Itype (gnat_entity), NULL_TREE, 0);
4036 /* Given GNAT_ENTITY, elaborate all expressions that are required to
4037 be elaborated at the point of its definition, but do nothing else. */
4040 elaborate_entity (gnat_entity)
4041 Entity_Id gnat_entity;
4043 switch (Ekind (gnat_entity))
4045 case E_Signed_Integer_Subtype:
4046 case E_Modular_Integer_Subtype:
4047 case E_Enumeration_Subtype:
4048 case E_Ordinary_Fixed_Point_Subtype:
4049 case E_Decimal_Fixed_Point_Subtype:
4050 case E_Floating_Point_Subtype:
4052 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
4053 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
4055 /* ??? Tests for avoiding static constaint error expression
4056 is needed until the front stops generating bogus conversions
4057 on bounds of real types. */
4059 if (! Raises_Constraint_Error (gnat_lb))
4060 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
4061 1, 0, Needs_Debug_Info (gnat_entity));
4062 if (! Raises_Constraint_Error (gnat_hb))
4063 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
4064 1, 0, Needs_Debug_Info (gnat_entity));
4070 Node_Id full_definition = Declaration_Node (gnat_entity);
4071 Node_Id record_definition = Type_Definition (full_definition);
4073 /* If this is a record extension, go a level further to find the
4074 record definition. */
4075 if (Nkind (record_definition) == N_Derived_Type_Definition)
4076 record_definition = Record_Extension_Part (record_definition);
4080 case E_Record_Subtype:
4081 case E_Private_Subtype:
4082 case E_Limited_Private_Subtype:
4083 case E_Record_Subtype_With_Private:
4084 if (Is_Constrained (gnat_entity)
4085 && Has_Discriminants (Base_Type (gnat_entity))
4086 && Present (Discriminant_Constraint (gnat_entity)))
4088 Node_Id gnat_discriminant_expr;
4089 Entity_Id gnat_field;
4091 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
4092 gnat_discriminant_expr
4093 = First_Elmt (Discriminant_Constraint (gnat_entity));
4094 Present (gnat_field);
4095 gnat_field = Next_Discriminant (gnat_field),
4096 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
4097 /* ??? For now, ignore access discriminants. */
4098 if (! Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
4099 elaborate_expression (Node (gnat_discriminant_expr),
4101 get_entity_name (gnat_field), 1, 0, 0);
4108 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
4109 any entities on its entity chain similarly. */
4112 mark_out_of_scope (gnat_entity)
4113 Entity_Id gnat_entity;
4115 Entity_Id gnat_sub_entity;
4116 unsigned int kind = Ekind (gnat_entity);
4118 /* If this has an entity list, process all in the list. */
4119 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
4120 || IN (kind, Private_Kind)
4121 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
4122 || kind == E_Function || kind == E_Generic_Function
4123 || kind == E_Generic_Package || kind == E_Generic_Procedure
4124 || kind == E_Loop || kind == E_Operator || kind == E_Package
4125 || kind == E_Package_Body || kind == E_Procedure
4126 || kind == E_Record_Type || kind == E_Record_Subtype
4127 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
4128 for (gnat_sub_entity = First_Entity (gnat_entity);
4129 Present (gnat_sub_entity);
4130 gnat_sub_entity = Next_Entity (gnat_sub_entity))
4131 if (Scope (gnat_sub_entity) == gnat_entity
4132 && gnat_sub_entity != gnat_entity)
4133 mark_out_of_scope (gnat_sub_entity);
4135 /* Now clear this if it has been defined, but only do so if it isn't
4136 a subprogram or parameter. We could refine this, but it isn't
4137 worth it. If this is statically allocated, it is supposed to
4138 hang around out of cope. */
4139 if (present_gnu_tree (gnat_entity) && ! Is_Statically_Allocated (gnat_entity)
4140 && kind != E_Procedure && kind != E_Function && ! IN (kind, Formal_Kind))
4142 save_gnu_tree (gnat_entity, NULL_TREE, 1);
4143 save_gnu_tree (gnat_entity, error_mark_node, 1);
4147 /* Return a TREE_LIST describing the substitutions needed to reflect
4148 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
4149 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
4150 of GNAT_SUBTYPE. The substitions can be in any order. TREE_PURPOSE
4151 gives the tree for the discriminant and TREE_VALUES is the replacement
4152 value. They are in the form of operands to substitute_in_expr.
4153 DEFINITION is as in gnat_to_gnu_entity. */
4156 substitution_list (gnat_subtype, gnat_type, gnu_list, definition)
4157 Entity_Id gnat_subtype;
4158 Entity_Id gnat_type;
4162 Entity_Id gnat_discrim;
4166 gnat_type = Implementation_Base_Type (gnat_subtype);
4168 if (Has_Discriminants (gnat_type))
4169 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
4170 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
4171 Present (gnat_discrim);
4172 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
4173 gnat_value = Next_Elmt (gnat_value))
4174 /* Ignore access discriminants. */
4175 if (! Is_Access_Type (Etype (Node (gnat_value))))
4176 gnu_list = tree_cons (gnat_to_gnu_entity (gnat_discrim, NULL_TREE, 0),
4177 elaborate_expression
4178 (Node (gnat_value), gnat_subtype,
4179 get_entity_name (gnat_discrim), definition,
4186 /* For the following two functions: for each GNAT entity, the GCC
4187 tree node used as a dummy for that entity, if any. */
4189 static GTY((length ("max_gnat_nodes"))) tree * dummy_node_table;
4191 /* Initialize the above table. */
4198 dummy_node_table = (tree *) ggc_alloc (max_gnat_nodes * sizeof (tree));
4200 for (gnat_node = 0; gnat_node < max_gnat_nodes; gnat_node++)
4201 dummy_node_table[gnat_node] = NULL_TREE;
4203 dummy_node_table -= First_Node_Id;
4206 /* Make a dummy type corresponding to GNAT_TYPE. */
4209 make_dummy_type (gnat_type)
4210 Entity_Id gnat_type;
4212 Entity_Id gnat_underlying;
4215 /* Find a full type for GNAT_TYPE, taking into account any class wide
4217 if (Is_Class_Wide_Type (gnat_type) && Present (Equivalent_Type (gnat_type)))
4218 gnat_type = Equivalent_Type (gnat_type);
4219 else if (Ekind (gnat_type) == E_Class_Wide_Type)
4220 gnat_type = Root_Type (gnat_type);
4222 for (gnat_underlying = gnat_type;
4223 (IN (Ekind (gnat_underlying), Incomplete_Or_Private_Kind)
4224 && Present (Full_View (gnat_underlying)));
4225 gnat_underlying = Full_View (gnat_underlying))
4228 /* If it there already a dummy type, use that one. Else make one. */
4229 if (dummy_node_table[gnat_underlying])
4230 return dummy_node_table[gnat_underlying];
4232 /* If this is a record, make this a RECORD_TYPE or UNION_TYPE; else make
4234 if (Is_Record_Type (gnat_underlying))
4235 gnu_type = make_node (Is_Unchecked_Union (gnat_underlying)
4236 ? UNION_TYPE : RECORD_TYPE);
4238 gnu_type = make_node (ENUMERAL_TYPE);
4240 TYPE_NAME (gnu_type) = get_entity_name (gnat_type);
4241 if (AGGREGATE_TYPE_P (gnu_type))
4242 TYPE_STUB_DECL (gnu_type)
4243 = pushdecl (build_decl (TYPE_DECL, NULL_TREE, gnu_type));
4245 TYPE_DUMMY_P (gnu_type) = 1;
4246 dummy_node_table[gnat_underlying] = gnu_type;
4251 /* Return 1 if the size represented by GNU_SIZE can be handled by an
4252 allocation. If STATIC_P is non-zero, consider only what can be
4253 done with a static allocation. */
4256 allocatable_size_p (gnu_size, static_p)
4260 HOST_WIDE_INT our_size;
4262 /* If this is not a static allocation, the only case we want to forbid
4263 is an overflowing size. That will be converted into a raise a
4266 return ! (TREE_CODE (gnu_size) == INTEGER_CST
4267 && TREE_CONSTANT_OVERFLOW (gnu_size));
4269 /* Otherwise, we need to deal with both variable sizes and constant
4270 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
4271 since assemblers may not like very large sizes. */
4272 if (!host_integerp (gnu_size, 1))
4275 our_size = tree_low_cst (gnu_size, 1);
4276 return (int) our_size == our_size;
4279 /* Return a list of attributes for GNAT_ENTITY, if any. */
4281 static struct attrib *
4282 build_attr_list (gnat_entity)
4283 Entity_Id gnat_entity;
4285 struct attrib *attr_list = 0;
4288 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
4289 gnat_temp = Next_Rep_Item (gnat_temp))
4290 if (Nkind (gnat_temp) == N_Pragma)
4292 struct attrib *attr;
4293 tree gnu_arg0 = 0, gnu_arg1 = 0;
4294 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
4295 enum attr_type etype;
4297 if (Present (gnat_assoc) && Present (First (gnat_assoc))
4298 && Present (Next (First (gnat_assoc)))
4299 && (Nkind (Expression (Next (First (gnat_assoc))))
4300 == N_String_Literal))
4302 gnu_arg0 = get_identifier (TREE_STRING_POINTER
4305 (First (gnat_assoc))))));
4306 if (Present (Next (Next (First (gnat_assoc))))
4307 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
4308 == N_String_Literal))
4309 gnu_arg1 = get_identifier (TREE_STRING_POINTER
4313 (First (gnat_assoc)))))));
4316 switch (Get_Pragma_Id (Chars (gnat_temp)))
4318 case Pragma_Machine_Attribute:
4319 etype = ATTR_MACHINE_ATTRIBUTE;
4322 case Pragma_Linker_Alias:
4323 etype = ATTR_LINK_ALIAS;
4326 case Pragma_Linker_Section:
4327 etype = ATTR_LINK_SECTION;
4330 case Pragma_Weak_External:
4331 etype = ATTR_WEAK_EXTERNAL;
4338 attr = (struct attrib *) xmalloc (sizeof (struct attrib));
4339 attr->next = attr_list;
4341 attr->name = gnu_arg0;
4342 attr->arg = gnu_arg1;
4344 = Present (Next (First (gnat_assoc)))
4345 ? Expression (Next (First (gnat_assoc))) : gnat_temp;
4352 /* Get the unpadded version of a GNAT type. */
4355 get_unpadded_type (gnat_entity)
4356 Entity_Id gnat_entity;
4358 tree type = gnat_to_gnu_type (gnat_entity);
4360 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4361 type = TREE_TYPE (TYPE_FIELDS (type));
4366 /* Called when we need to protect a variable object using a save_expr. */
4369 maybe_variable (gnu_operand, gnat_node)
4373 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
4374 || TREE_CODE (gnu_operand) == SAVE_EXPR
4375 || TREE_CODE (gnu_operand) == NULL_EXPR)
4378 /* If we will be generating code, make sure we are at the proper
4380 if (! global_bindings_p () && ! CONTAINS_PLACEHOLDER_P (gnu_operand))
4381 set_lineno (gnat_node, 1);
4383 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
4384 return build1 (UNCONSTRAINED_ARRAY_REF, TREE_TYPE (gnu_operand),
4385 variable_size (TREE_OPERAND (gnu_operand, 0)));
4387 return variable_size (gnu_operand);
4390 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
4391 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
4392 return the GCC tree to use for that expression. GNU_NAME is the
4393 qualification to use if an external name is appropriate and DEFINITION is
4394 nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero,
4395 we need a result. Otherwise, we are just elaborating this for
4396 side-effects. If NEED_DEBUG is nonzero we need the symbol for debugging
4397 purposes even if it isn't needed for code generation. */
4400 elaborate_expression (gnat_expr, gnat_entity, gnu_name, definition,
4401 need_value, need_debug)
4403 Entity_Id gnat_entity;
4411 /* If we already elaborated this expression (e.g., it was involved
4412 in the definition of a private type), use the old value. */
4413 if (present_gnu_tree (gnat_expr))
4414 return get_gnu_tree (gnat_expr);
4416 /* If we don't need a value and this is static or a discriment, we
4417 don't need to do anything. */
4418 else if (! need_value
4419 && (Is_OK_Static_Expression (gnat_expr)
4420 || (Nkind (gnat_expr) == N_Identifier
4421 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
4424 /* Otherwise, convert this tree to its GCC equivalant. */
4426 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
4427 gnu_name, definition, need_debug);
4429 /* Save the expression in case we try to elaborate this entity again.
4430 Since this is not a DECL, don't check it. If this is a constant,
4431 don't save it since GNAT_EXPR might be used more than once. Also,
4432 don't save if it's a discriminant. */
4433 if (! CONTAINS_PLACEHOLDER_P (gnu_expr))
4434 save_gnu_tree (gnat_expr, gnu_expr, 1);
4436 return need_value ? gnu_expr : error_mark_node;
4439 /* Similar, but take a GNU expression. */
4442 elaborate_expression_1 (gnat_expr, gnat_entity, gnu_expr, gnu_name, definition,
4445 Entity_Id gnat_entity;
4452 /* Strip any conversions to see if the expression is a readonly variable.
4453 ??? This really should remain readonly, but we have to think about
4454 the typing of the tree here. */
4455 tree gnu_inner_expr = remove_conversions (gnu_expr, 1);
4456 int expr_global = Is_Public (gnat_entity) || global_bindings_p ();
4459 /* In most cases, we won't see a naked FIELD_DECL here because a
4460 discriminant reference will have been replaced with a COMPONENT_REF
4461 when the type is being elaborated. However, there are some cases
4462 involving child types where we will. So convert it to a COMPONENT_REF
4463 here. We have to hope it will be at the highest level of the
4464 expression in these cases. */
4465 if (TREE_CODE (gnu_expr) == FIELD_DECL)
4466 gnu_expr = build (COMPONENT_REF, TREE_TYPE (gnu_expr),
4467 build (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
4470 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
4471 that is a constant, make a variable that is initialized to contain the
4472 bound when the package containing the definition is elaborated. If
4473 this entity is defined at top level and a bound or discriminant value
4474 isn't a constant or a reference to a discriminant, replace the bound
4475 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
4476 rely here on the fact that an expression cannot contain both the
4477 discriminant and some other variable. */
4479 expr_variable = (TREE_CODE_CLASS (TREE_CODE (gnu_expr)) != 'c'
4480 && ! (TREE_CODE (gnu_inner_expr) == VAR_DECL
4481 && TREE_READONLY (gnu_inner_expr))
4482 && ! CONTAINS_PLACEHOLDER_P (gnu_expr));
4484 /* If this is a static expression or contains a discriminant, we don't
4485 need the variable for debugging (and can't elaborate anyway if a
4488 && (Is_OK_Static_Expression (gnat_expr)
4489 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
4492 /* Now create the variable if we need it. */
4493 if (need_debug || (expr_variable && expr_global))
4495 set_lineno (gnat_entity, ! global_bindings_p ());
4497 = create_var_decl (create_concat_name (gnat_entity,
4498 IDENTIFIER_POINTER (gnu_name)),
4499 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, 1,
4500 Is_Public (gnat_entity), ! definition, 0, 0);
4503 /* We only need to use this variable if we are in global context since GCC
4504 can do the right thing in the local case. */
4505 if (expr_global && expr_variable)
4507 else if (! expr_variable)
4510 return maybe_variable (gnu_expr, gnat_expr);
4513 /* Create a record type that contains a field of TYPE with a starting bit
4514 position so that it is aligned to ALIGN bits and is SIZE bytes long. */
4517 make_aligning_type (type, align, size)
4522 tree record_type = make_node (RECORD_TYPE);
4523 tree place = build (PLACEHOLDER_EXPR, record_type);
4524 tree size_addr_place = convert (sizetype,
4525 build_unary_op (ADDR_EXPR, NULL_TREE,
4527 tree name = TYPE_NAME (type);
4530 if (TREE_CODE (name) == TYPE_DECL)
4531 name = DECL_NAME (name);
4533 TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN");
4535 /* The bit position is obtained by "and"ing the alignment minus 1
4536 with the two's complement of the address and multiplying
4537 by the number of bits per unit. Do all this in sizetype. */
4539 pos = size_binop (MULT_EXPR,
4540 convert (bitsizetype,
4541 size_binop (BIT_AND_EXPR,
4542 size_diffop (size_zero_node,
4544 ssize_int ((align / BITS_PER_UNIT)
4548 field = create_field_decl (get_identifier ("F"), type, record_type,
4550 DECL_BIT_FIELD (field) = 0;
4552 finish_record_type (record_type, field, 1, 0);
4553 TYPE_ALIGN (record_type) = BIGGEST_ALIGNMENT;
4554 TYPE_SIZE (record_type)
4555 = size_binop (PLUS_EXPR,
4556 size_binop (MULT_EXPR, convert (bitsizetype, size),
4558 bitsize_int (align));
4559 TYPE_SIZE_UNIT (record_type)
4560 = size_binop (PLUS_EXPR, size, size_int (align / BITS_PER_UNIT));
4561 TYPE_ALIAS_SET (record_type) = get_alias_set (type);
4565 /* TYPE is a RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE, with BLKmode that's
4566 being used as the field type of a packed record. See if we can rewrite it
4567 as a record that has a non-BLKmode type, which we can pack tighter. If so,
4568 return the new type. If not, return the original type. */
4571 make_packable_type (type)
4574 tree new_type = make_node (TREE_CODE (type));
4575 tree field_list = NULL_TREE;
4578 /* Copy the name and flags from the old type to that of the new and set
4579 the alignment to try for an integral type. For QUAL_UNION_TYPE,
4580 also copy the size. */
4581 TYPE_NAME (new_type) = TYPE_NAME (type);
4582 TYPE_LEFT_JUSTIFIED_MODULAR_P (new_type)
4583 = TYPE_LEFT_JUSTIFIED_MODULAR_P (type);
4584 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
4585 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
4586 if (TREE_CODE (type) == QUAL_UNION_TYPE)
4588 TYPE_SIZE (new_type) = TYPE_SIZE (type);
4589 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
4592 TYPE_ALIGN (new_type)
4593 = ((HOST_WIDE_INT) 1
4594 << (floor_log2 (tree_low_cst (TYPE_SIZE (type), 1) - 1) + 1));
4596 /* Now copy the fields, keeping the position and size. */
4597 for (old_field = TYPE_FIELDS (type); old_field != 0;
4598 old_field = TREE_CHAIN (old_field))
4600 tree new_field_type = TREE_TYPE (old_field);
4603 if (TYPE_MODE (new_field_type) == BLKmode
4604 && (TREE_CODE (new_field_type) == RECORD_TYPE
4605 || TREE_CODE (new_field_type) == UNION_TYPE
4606 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
4607 && host_integerp (TYPE_SIZE (new_field_type), 1))
4608 new_field_type = make_packable_type (new_field_type);
4610 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
4611 new_type, TYPE_PACKED (type),
4612 DECL_SIZE (old_field),
4613 bit_position (old_field),
4614 ! DECL_NONADDRESSABLE_P (old_field));
4616 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
4617 SET_DECL_ORIGINAL_FIELD (new_field,
4618 (DECL_ORIGINAL_FIELD (old_field) != 0
4619 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
4621 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
4622 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
4624 TREE_CHAIN (new_field) = field_list;
4625 field_list = new_field;
4628 finish_record_type (new_type, nreverse (field_list), 1, 1);
4629 TYPE_ALIAS_SET (new_type) = get_alias_set (type);
4630 return TYPE_MODE (new_type) == BLKmode ? type : new_type;
4633 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
4634 if needed. We have already verified that SIZE and TYPE are large enough.
4636 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
4639 IS_USER_TYPE is nonzero if we must be sure we complete the original type.
4641 DEFINITION is nonzero if this type is being defined.
4643 SAME_RM_SIZE is nonzero if the RM_Size of the resulting type is to be
4644 set to its TYPE_SIZE; otherwise, it's set to the RM_Size of the original
4648 maybe_pad_type (type, size, align, gnat_entity, name_trailer,
4649 is_user_type, definition, same_rm_size)
4653 Entity_Id gnat_entity;
4654 const char *name_trailer;
4659 tree orig_size = TYPE_SIZE (type);
4663 /* If TYPE is a padded type, see if it agrees with any size and alignment
4664 we were given. If so, return the original type. Otherwise, strip
4665 off the padding, since we will either be returning the inner type
4666 or repadding it. If no size or alignment is specified, use that of
4667 the original padded type. */
4669 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4672 || operand_equal_p (round_up (size,
4673 MAX (align, TYPE_ALIGN (type))),
4674 round_up (TYPE_SIZE (type),
4675 MAX (align, TYPE_ALIGN (type))),
4677 && (align == 0 || align == TYPE_ALIGN (type)))
4681 size = TYPE_SIZE (type);
4683 align = TYPE_ALIGN (type);
4685 type = TREE_TYPE (TYPE_FIELDS (type));
4686 orig_size = TYPE_SIZE (type);
4689 /* If the size is either not being changed or is being made smaller (which
4690 is not done here (and is only valid for bitfields anyway), show the size
4691 isn't changing. Likewise, clear the alignment if it isn't being
4692 changed. Then return if we aren't doing anything. */
4695 && (operand_equal_p (size, orig_size, 0)
4696 || (TREE_CODE (orig_size) == INTEGER_CST
4697 && tree_int_cst_lt (size, orig_size))))
4700 if (align == TYPE_ALIGN (type))
4703 if (align == 0 && size == 0)
4706 /* We used to modify the record in place in some cases, but that could
4707 generate incorrect debugging information. So make a new record
4709 record = make_node (RECORD_TYPE);
4711 if (Present (gnat_entity))
4712 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
4714 /* If we were making a type, complete the original type and give it a
4717 create_type_decl (get_entity_name (gnat_entity), type,
4718 0, ! Comes_From_Source (gnat_entity),
4719 ! (TYPE_NAME (type) != 0
4720 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
4721 && DECL_IGNORED_P (TYPE_NAME (type))));
4723 /* If we are changing the alignment and the input type is a record with
4724 BLKmode and a small constant size, try to make a form that has an
4725 integral mode. That might allow this record to have an integral mode,
4726 which will be much more efficient. There is no point in doing this if a
4727 size is specified unless it is also smaller than the biggest alignment
4728 and it is incorrect to do this if the size of the original type is not a
4729 multiple of the alignment. */
4731 && TREE_CODE (type) == RECORD_TYPE
4732 && TYPE_MODE (type) == BLKmode
4733 && host_integerp (orig_size, 1)
4734 && compare_tree_int (orig_size, BIGGEST_ALIGNMENT) <= 0
4736 || (TREE_CODE (size) == INTEGER_CST
4737 && compare_tree_int (size, BIGGEST_ALIGNMENT) <= 0))
4738 && tree_low_cst (orig_size, 1) % align == 0)
4739 type = make_packable_type (type);
4741 field = create_field_decl (get_identifier ("F"), type, record, 0,
4742 NULL_TREE, bitsize_zero_node, 1);
4744 DECL_INTERNAL_P (field) = 1;
4745 TYPE_SIZE (record) = size != 0 ? size : orig_size;
4746 TYPE_SIZE_UNIT (record)
4747 = convert (sizetype,
4748 size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
4749 bitsize_unit_node));
4750 TYPE_ALIGN (record) = align;
4751 TYPE_IS_PADDING_P (record) = 1;
4752 TYPE_VOLATILE (record)
4753 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
4754 finish_record_type (record, field, 1, 0);
4756 /* Keep the RM_Size of the padded record as that of the old record
4758 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : rm_size (type));
4760 /* Unless debugging information isn't being written for the input type,
4761 write a record that shows what we are a subtype of and also make a
4762 variable that indicates our size, if variable. */
4763 if (TYPE_NAME (record) != 0
4764 && AGGREGATE_TYPE_P (type)
4765 && (TREE_CODE (TYPE_NAME (type)) != TYPE_DECL
4766 || ! DECL_IGNORED_P (TYPE_NAME (type))))
4768 tree marker = make_node (RECORD_TYPE);
4769 tree name = DECL_NAME (TYPE_NAME (record));
4770 tree orig_name = TYPE_NAME (type);
4772 if (TREE_CODE (orig_name) == TYPE_DECL)
4773 orig_name = DECL_NAME (orig_name);
4775 TYPE_NAME (marker) = concat_id_with_name (name, "XVS");
4776 finish_record_type (marker,
4777 create_field_decl (orig_name, integer_type_node,
4778 marker, 0, NULL_TREE, NULL_TREE,
4782 if (size != 0 && TREE_CODE (size) != INTEGER_CST && definition)
4783 create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE,
4784 sizetype, TYPE_SIZE (record), 0, 0, 0, 0,
4790 if (CONTAINS_PLACEHOLDER_P (orig_size))
4791 orig_size = max_size (orig_size, 1);
4793 /* If the size was widened explicitly, maybe give a warning. */
4794 if (size != 0 && Present (gnat_entity)
4795 && ! operand_equal_p (size, orig_size, 0)
4796 && ! (TREE_CODE (size) == INTEGER_CST
4797 && TREE_CODE (orig_size) == INTEGER_CST
4798 && tree_int_cst_lt (size, orig_size)))
4800 Node_Id gnat_error_node = Empty;
4802 if (Is_Packed_Array_Type (gnat_entity))
4803 gnat_entity = Associated_Node_For_Itype (gnat_entity);
4805 if ((Ekind (gnat_entity) == E_Component
4806 || Ekind (gnat_entity) == E_Discriminant)
4807 && Present (Component_Clause (gnat_entity)))
4808 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
4809 else if (Present (Size_Clause (gnat_entity)))
4810 gnat_error_node = Expression (Size_Clause (gnat_entity));
4812 /* Generate message only for entities that come from source, since
4813 if we have an entity created by expansion, the message will be
4814 generated for some other corresponding source entity. */
4815 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
4816 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
4818 size_diffop (size, orig_size));
4820 else if (*name_trailer == 'C' && ! Is_Internal (gnat_entity))
4821 post_error_ne_tree ("component of& padded{ by ^ bits}?",
4822 gnat_entity, gnat_entity,
4823 size_diffop (size, orig_size));
4829 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
4830 the value passed against the list of choices. */
4833 choices_to_gnu (operand, choices)
4839 tree result = integer_zero_node;
4840 tree this_test, low = 0, high = 0, single = 0;
4842 for (choice = First (choices); Present (choice); choice = Next (choice))
4844 switch (Nkind (choice))
4847 low = gnat_to_gnu (Low_Bound (choice));
4848 high = gnat_to_gnu (High_Bound (choice));
4850 /* There's no good type to use here, so we might as well use
4851 integer_type_node. */
4853 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4854 build_binary_op (GE_EXPR, integer_type_node,
4856 build_binary_op (LE_EXPR, integer_type_node,
4861 case N_Subtype_Indication:
4862 gnat_temp = Range_Expression (Constraint (choice));
4863 low = gnat_to_gnu (Low_Bound (gnat_temp));
4864 high = gnat_to_gnu (High_Bound (gnat_temp));
4867 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4868 build_binary_op (GE_EXPR, integer_type_node,
4870 build_binary_op (LE_EXPR, integer_type_node,
4875 case N_Expanded_Name:
4876 /* This represents either a subtype range, an enumeration
4877 literal, or a constant Ekind says which. If an enumeration
4878 literal or constant, fall through to the next case. */
4879 if (Ekind (Entity (choice)) != E_Enumeration_Literal
4880 && Ekind (Entity (choice)) != E_Constant)
4882 tree type = gnat_to_gnu_type (Entity (choice));
4884 low = TYPE_MIN_VALUE (type);
4885 high = TYPE_MAX_VALUE (type);
4888 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
4889 build_binary_op (GE_EXPR, integer_type_node,
4891 build_binary_op (LE_EXPR, integer_type_node,
4895 /* ... fall through ... */
4896 case N_Character_Literal:
4897 case N_Integer_Literal:
4898 single = gnat_to_gnu (choice);
4899 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
4903 case N_Others_Choice:
4904 this_test = integer_one_node;
4911 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
4918 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
4919 placed in GNU_RECORD_TYPE.
4921 PACKED is 1 if the enclosing record is packed and -1 if the enclosing
4922 record has a Component_Alignment of Storage_Unit.
4924 DEFINITION is nonzero if this field is for a record being defined. */
4927 gnat_to_gnu_field (gnat_field, gnu_record_type, packed, definition)
4928 Entity_Id gnat_field;
4929 tree gnu_record_type;
4933 tree gnu_field_id = get_entity_name (gnat_field);
4934 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
4935 tree gnu_orig_field_type = gnu_field_type;
4939 int needs_strict_alignment
4940 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
4941 || Treat_As_Volatile (gnat_field));
4943 /* If this field requires strict alignment or contains an item of
4944 variable sized, pretend it isn't packed. */
4945 if (needs_strict_alignment || is_variable_size (gnu_field_type))
4948 /* For packed records, this is one of the few occasions on which we use
4949 the official RM size for discrete or fixed-point components, instead
4950 of the normal GNAT size stored in Esize. See description in Einfo:
4951 "Handling of Type'Size Values" for further details. */
4954 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
4955 gnat_field, FIELD_DECL, 0, 1);
4957 if (Known_Static_Esize (gnat_field))
4958 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
4959 gnat_field, FIELD_DECL, 0, 1);
4961 /* If the field's type is a left-justified modular type, make the field
4962 the type of the inner object unless it is aliases. We don't need
4963 the the wrapper here and it can prevent packing. */
4964 if (! Is_Aliased (gnat_field) && TREE_CODE (gnu_field_type) == RECORD_TYPE
4965 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_field_type))
4966 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
4968 /* If we are packing this record or we have a specified size that's
4969 smaller than that of the field type and the field type is also a record
4970 that's BLKmode and with a small constant size, see if we can get a
4971 better form of the type that allows more packing. If we can, show
4972 a size was specified for it if there wasn't one so we know to
4973 make this a bitfield and avoid making things wider. */
4974 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
4975 && TYPE_MODE (gnu_field_type) == BLKmode
4976 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
4977 && compare_tree_int (TYPE_SIZE (gnu_field_type), BIGGEST_ALIGNMENT) <= 0
4979 || (gnu_size != 0 && tree_int_cst_lt (gnu_size,
4980 TYPE_SIZE (gnu_field_type)))))
4982 gnu_field_type = make_packable_type (gnu_field_type);
4984 if (gnu_field_type != gnu_orig_field_type && gnu_size == 0)
4985 gnu_size = rm_size (gnu_field_type);
4988 /* If we are packing the record and the field is BLKmode, round the
4989 size up to a byte boundary. */
4990 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size != 0)
4991 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
4993 if (Present (Component_Clause (gnat_field)))
4995 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
4996 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
4997 gnat_field, FIELD_DECL, 0, 1);
4999 /* Ensure the position does not overlap with the parent subtype,
5001 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
5004 = gnat_to_gnu_type (Parent_Subtype
5005 (Underlying_Type (Scope (gnat_field))));
5007 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
5008 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
5011 ("offset of& must be beyond parent{, minimum allowed is ^}",
5012 First_Bit (Component_Clause (gnat_field)), gnat_field,
5013 TYPE_SIZE_UNIT (gnu_parent));
5017 /* If this field needs strict alignment, ensure the record is
5018 sufficiently aligned and that that position and size are
5019 consistent with the alignment. */
5020 if (needs_strict_alignment)
5022 tree gnu_min_size = round_up (rm_size (gnu_field_type),
5023 TYPE_ALIGN (gnu_field_type));
5025 TYPE_ALIGN (gnu_record_type)
5026 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
5028 /* If Atomic, the size must match exactly and if aliased, the size
5029 must not be less than the rounded size. */
5030 if ((Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
5031 && ! operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
5034 ("atomic field& must be natural size of type{ (^)}",
5035 Last_Bit (Component_Clause (gnat_field)), gnat_field,
5036 TYPE_SIZE (gnu_field_type));
5041 else if (Is_Aliased (gnat_field)
5043 && tree_int_cst_lt (gnu_size, gnu_min_size))
5046 ("size of aliased field& too small{, minimum required is ^}",
5047 Last_Bit (Component_Clause (gnat_field)), gnat_field,
5052 if (! integer_zerop (size_binop
5053 (TRUNC_MOD_EXPR, gnu_pos,
5054 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
5056 if (Is_Aliased (gnat_field))
5058 ("position of aliased field& must be multiple of ^ bits",
5059 First_Bit (Component_Clause (gnat_field)), gnat_field,
5060 TYPE_ALIGN (gnu_field_type));
5062 else if (Treat_As_Volatile (gnat_field))
5064 ("position of volatile field& must be multiple of ^ bits",
5065 First_Bit (Component_Clause (gnat_field)), gnat_field,
5066 TYPE_ALIGN (gnu_field_type));
5068 else if (Strict_Alignment (Etype (gnat_field)))
5070 ("position of & with aliased or tagged components not multiple of ^ bits",
5071 First_Bit (Component_Clause (gnat_field)), gnat_field,
5072 TYPE_ALIGN (gnu_field_type));
5079 /* If an error set the size to zero, show we have no position
5085 if (Is_Atomic (gnat_field))
5086 check_ok_for_atomic (gnu_field_type, gnat_field, 0);
5088 if (gnu_pos != 0 && TYPE_MODE (gnu_field_type) == BLKmode
5089 && (! integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_pos,
5090 bitsize_unit_node)))
5091 && TYPE_MODE (gnu_field_type) == BLKmode)
5093 post_error_ne ("fields of& must start at storage unit boundary",
5094 First_Bit (Component_Clause (gnat_field)),
5095 Etype (gnat_field));
5100 /* If the record has rep clauses and this is the tag field, make a rep
5101 clause for it as well. */
5102 else if (Has_Specified_Layout (Scope (gnat_field))
5103 && Chars (gnat_field) == Name_uTag)
5105 gnu_pos = bitsize_zero_node;
5106 gnu_size = TYPE_SIZE (gnu_field_type);
5109 /* If a size is specified and this is a BLKmode field, it must be an
5110 integral number of bytes. */
5111 if (gnu_size != 0 && TYPE_MODE (gnu_field_type) == BLKmode
5112 && ! integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_size,
5113 bitsize_unit_node)))
5115 post_error_ne ("size of fields of& must be multiple of a storage unit",
5116 gnat_field, Etype (gnat_field));
5117 gnu_pos = gnu_size = 0;
5120 /* We need to make the size the maximum for the type if it is
5121 self-referential and an unconstrained type. In that case, we can't
5122 pack the field since we can't make a copy to align it. */
5123 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5125 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
5126 && ! Is_Constrained (Underlying_Type (Etype (gnat_field))))
5128 gnu_size = max_size (TYPE_SIZE (gnu_field_type), 1);
5132 /* If no size is specified (or if there was an error), don't specify a
5138 /* Unless this field is aliased, we can remove any left-justified
5139 modular type since it's only needed in the unchecked conversion
5140 case, which doesn't apply here. */
5141 if (! needs_strict_alignment
5142 && TREE_CODE (gnu_field_type) == RECORD_TYPE
5143 && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_field_type))
5144 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
5147 = make_type_from_size (gnu_field_type, gnu_size,
5148 Has_Biased_Representation (gnat_field));
5149 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0,
5150 gnat_field, "PAD", 0, definition, 1);
5153 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5154 && TYPE_CONTAINS_TEMPLATE_P (gnu_field_type))
5157 /* Now create the decl for the field. */
5158 set_lineno (gnat_field, 0);
5159 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
5160 packed, gnu_size, gnu_pos,
5161 Is_Aliased (gnat_field));
5163 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
5165 if (Ekind (gnat_field) == E_Discriminant)
5166 DECL_DISCRIMINANT_NUMBER (gnu_field)
5167 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
5172 /* Return 1 if TYPE is a type with variable size, a padding type with a field
5173 of variable size or is a record that has a field such a field. */
5176 is_variable_size (type)
5181 /* We need not be concerned about this at all if we don't have
5182 strict alignment. */
5183 if (! STRICT_ALIGNMENT)
5185 else if (! TREE_CONSTANT (TYPE_SIZE (type)))
5187 else if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)
5188 && ! TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
5190 else if (TREE_CODE (type) != RECORD_TYPE
5191 && TREE_CODE (type) != UNION_TYPE
5192 && TREE_CODE (type) != QUAL_UNION_TYPE)
5195 for (field = TYPE_FIELDS (type); field != 0; field = TREE_CHAIN (field))
5196 if (is_variable_size (TREE_TYPE (field)))
5202 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
5203 of GCC trees for fields that are in the record and have already been
5204 processed. When called from gnat_to_gnu_entity during the processing of a
5205 record type definition, the GCC nodes for the discriminants will be on
5206 the chain. The other calls to this function are recursive calls from
5207 itself for the Component_List of a variant and the chain is empty.
5209 PACKED is 1 if this is for a record with "pragma pack" and -1 is this is
5210 for a record type with "pragma component_alignment (storage_unit)".
5212 FINISH_RECORD is nonzero if this call will supply all of the remaining
5213 fields of the record.
5215 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
5216 with a rep clause is to be added. If it is nonzero, that is all that
5217 should be done with such fields.
5219 CANCEL_ALIGNMENT, if nonzero, means the alignment should be zeroed
5220 before laying out the record. This means the alignment only serves
5221 to force fields to be bitfields, but not require the record to be
5222 that aligned. This is used for variants.
5224 ALL_REP, if nonzero, means that a rep clause was found for all the
5225 fields. This simplifies the logic since we know we're not in the mixed
5228 The processing of the component list fills in the chain with all of the
5229 fields of the record and then the record type is finished. */
5232 components_to_record (gnu_record_type, component_list, gnu_field_list, packed,
5233 definition, p_gnu_rep_list, cancel_alignment, all_rep)
5234 tree gnu_record_type;
5235 Node_Id component_list;
5236 tree gnu_field_list;
5239 tree *p_gnu_rep_list;
5240 int cancel_alignment;
5243 Node_Id component_decl;
5244 Entity_Id gnat_field;
5245 Node_Id variant_part;
5247 tree gnu_our_rep_list = NULL_TREE;
5248 tree gnu_field, gnu_last;
5249 int layout_with_rep = 0;
5250 int all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type) != 0;
5252 /* For each variable within each component declaration create a GCC field
5253 and add it to the list, skipping any pragmas in the list. */
5255 if (Present (Component_Items (component_list)))
5256 for (component_decl = First_Non_Pragma (Component_Items (component_list));
5257 Present (component_decl);
5258 component_decl = Next_Non_Pragma (component_decl))
5260 gnat_field = Defining_Entity (component_decl);
5262 if (Chars (gnat_field) == Name_uParent)
5263 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
5266 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
5267 packed, definition);
5269 /* If this is the _Tag field, put it before any discriminants,
5270 instead of after them as is the case for all other fields.
5271 Ignore field of void type if only annotating. */
5272 if (Chars (gnat_field) == Name_uTag)
5273 gnu_field_list = chainon (gnu_field_list, gnu_field);
5276 TREE_CHAIN (gnu_field) = gnu_field_list;
5277 gnu_field_list = gnu_field;
5281 save_gnu_tree (gnat_field, gnu_field, 0);
5284 /* At the end of the component list there may be a variant part. */
5285 variant_part = Variant_Part (component_list);
5287 /* If this is an unchecked union, each variant must have exactly one
5288 component, each of which becomes one component of this union. */
5289 if (TREE_CODE (gnu_record_type) == UNION_TYPE && Present (variant_part))
5290 for (variant = First_Non_Pragma (Variants (variant_part));
5292 variant = Next_Non_Pragma (variant))
5295 = First_Non_Pragma (Component_Items (Component_List (variant)));
5296 gnat_field = Defining_Entity (component_decl);
5297 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
5299 TREE_CHAIN (gnu_field) = gnu_field_list;
5300 gnu_field_list = gnu_field;
5301 save_gnu_tree (gnat_field, gnu_field, 0);
5304 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
5305 mutually exclusive and should go in the same memory. To do this we need
5306 to treat each variant as a record whose elements are created from the
5307 component list for the variant. So here we create the records from the
5308 lists for the variants and put them all into the QUAL_UNION_TYPE. */
5309 else if (Present (variant_part))
5311 tree gnu_discriminant = gnat_to_gnu (Name (variant_part));
5313 tree gnu_union_type = make_node (QUAL_UNION_TYPE);
5314 tree gnu_union_field;
5315 tree gnu_variant_list = NULL_TREE;
5316 tree gnu_name = TYPE_NAME (gnu_record_type);
5318 = concat_id_with_name
5319 (get_identifier (Get_Name_String (Chars (Name (variant_part)))),
5322 if (TREE_CODE (gnu_name) == TYPE_DECL)
5323 gnu_name = DECL_NAME (gnu_name);
5325 TYPE_NAME (gnu_union_type)
5326 = concat_id_with_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
5327 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
5329 for (variant = First_Non_Pragma (Variants (variant_part));
5331 variant = Next_Non_Pragma (variant))
5333 tree gnu_variant_type = make_node (RECORD_TYPE);
5334 tree gnu_inner_name;
5337 Get_Variant_Encoding (variant);
5338 gnu_inner_name = get_identifier (Name_Buffer);
5339 TYPE_NAME (gnu_variant_type)
5340 = concat_id_with_name (TYPE_NAME (gnu_union_type),
5341 IDENTIFIER_POINTER (gnu_inner_name));
5343 /* Set the alignment of the inner type in case we need to make
5344 inner objects into bitfields, but then clear it out
5345 so the record actually gets only the alignment required. */
5346 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
5347 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
5349 /* Similarly, if the outer record has a size specified and all fields
5350 have record rep clauses, we can propagate the size into the
5352 if (all_rep_and_size)
5354 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
5355 TYPE_SIZE_UNIT (gnu_variant_type)
5356 = TYPE_SIZE_UNIT (gnu_record_type);
5359 components_to_record (gnu_variant_type, Component_List (variant),
5360 NULL_TREE, packed, definition,
5361 &gnu_our_rep_list, !all_rep_and_size, all_rep);
5363 gnu_qual = choices_to_gnu (gnu_discriminant,
5364 Discrete_Choices (variant));
5366 Set_Present_Expr (variant, annotate_value (gnu_qual));
5367 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
5370 ? TYPE_SIZE (gnu_record_type) : 0),
5372 ? bitsize_zero_node : 0),
5375 DECL_INTERNAL_P (gnu_field) = 1;
5376 DECL_QUALIFIER (gnu_field) = gnu_qual;
5377 TREE_CHAIN (gnu_field) = gnu_variant_list;
5378 gnu_variant_list = gnu_field;
5381 /* We can delete any empty variants from the end. This may leave none
5382 left. Note we cannot delete variants from anywhere else. */
5383 while (gnu_variant_list != 0
5384 && TYPE_FIELDS (TREE_TYPE (gnu_variant_list)) == 0)
5385 gnu_variant_list = TREE_CHAIN (gnu_variant_list);
5387 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
5388 if (gnu_variant_list != 0)
5390 if (all_rep_and_size)
5392 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
5393 TYPE_SIZE_UNIT (gnu_union_type)
5394 = TYPE_SIZE_UNIT (gnu_record_type);
5397 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
5398 all_rep_and_size, 0);
5401 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
5403 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
5404 all_rep ? bitsize_zero_node : 0, 1);
5406 DECL_INTERNAL_P (gnu_union_field) = 1;
5407 TREE_CHAIN (gnu_union_field) = gnu_field_list;
5408 gnu_field_list = gnu_union_field;
5412 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
5413 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
5414 in a separate pass since we want to handle the discriminants but can't
5415 play with them until we've used them in debugging data above.
5417 ??? Note: if we then reorder them, debugging information will be wrong,
5418 but there's nothing that can be done about this at the moment. */
5420 for (gnu_field = gnu_field_list, gnu_last = 0; gnu_field; )
5422 if (DECL_FIELD_OFFSET (gnu_field) != 0)
5424 tree gnu_next = TREE_CHAIN (gnu_field);
5427 gnu_field_list = gnu_next;
5429 TREE_CHAIN (gnu_last) = gnu_next;
5431 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
5432 gnu_our_rep_list = gnu_field;
5433 gnu_field = gnu_next;
5437 gnu_last = gnu_field;
5438 gnu_field = TREE_CHAIN (gnu_field);
5442 /* If we have any items in our rep'ed field list, it is not the case that all
5443 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
5444 set it and ignore the items. Otherwise, sort the fields by bit position
5445 and put them into their own record if we have any fields without
5447 if (gnu_our_rep_list != 0 && p_gnu_rep_list != 0 && ! all_rep)
5448 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
5449 else if (gnu_our_rep_list != 0)
5452 = gnu_field_list == 0 ? gnu_record_type : make_node (RECORD_TYPE);
5453 int len = list_length (gnu_our_rep_list);
5454 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
5457 /* Set DECL_SECTION_NAME to increasing integers so we have a
5459 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
5460 gnu_field = TREE_CHAIN (gnu_field), i++)
5462 gnu_arr[i] = gnu_field;
5463 DECL_SECTION_NAME (gnu_field) = size_int (i);
5466 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
5468 /* Put the fields in the list in order of increasing position, which
5469 means we start from the end. */
5470 gnu_our_rep_list = NULL_TREE;
5471 for (i = len - 1; i >= 0; i--)
5473 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
5474 gnu_our_rep_list = gnu_arr[i];
5475 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
5476 DECL_SECTION_NAME (gnu_arr[i]) = 0;
5479 if (gnu_field_list != 0)
5481 finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, 0);
5482 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
5483 gnu_record_type, 0, 0, 0, 1);
5484 DECL_INTERNAL_P (gnu_field) = 1;
5485 gnu_field_list = chainon (gnu_field_list, gnu_field);
5489 layout_with_rep = 1;
5490 gnu_field_list = nreverse (gnu_our_rep_list);
5494 if (cancel_alignment)
5495 TYPE_ALIGN (gnu_record_type) = 0;
5497 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
5498 layout_with_rep, 0);
5501 /* Called via qsort from the above. Returns -1, 1, depending on the
5502 bit positions and ordinals of the two fields. */
5505 compare_field_bitpos (rt1, rt2)
5509 tree *t1 = (tree *) rt1;
5510 tree *t2 = (tree *) rt2;
5512 if (tree_int_cst_equal (bit_position (*t1), bit_position (*t2)))
5514 (tree_int_cst_lt (DECL_SECTION_NAME (*t1), DECL_SECTION_NAME (*t2))
5516 else if (tree_int_cst_lt (bit_position (*t1), bit_position (*t2)))
5522 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
5523 placed into an Esize, Component_Bit_Offset, or Component_Size value
5524 in the GNAT tree. */
5527 annotate_value (gnu_size)
5530 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
5532 Node_Ref_Or_Val ops[3], ret;
5536 /* If back annotation is suppressed by the front end, return No_Uint */
5537 if (!Back_Annotate_Rep_Info)
5540 /* See if we've already saved the value for this node. */
5541 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (gnu_size)))
5542 && TREE_COMPLEXITY (gnu_size) != 0)
5543 return (Node_Ref_Or_Val) TREE_COMPLEXITY (gnu_size);
5545 /* If we do not return inside this switch, TCODE will be set to the
5546 code to use for a Create_Node operand and LEN (set above) will be
5547 the number of recursive calls for us to make. */
5549 switch (TREE_CODE (gnu_size))
5552 if (TREE_OVERFLOW (gnu_size))
5555 /* This may have come from a conversion from some smaller type,
5556 so ensure this is in bitsizetype. */
5557 gnu_size = convert (bitsizetype, gnu_size);
5559 /* For negative values, use NEGATE_EXPR of the supplied value. */
5560 if (tree_int_cst_sgn (gnu_size) < 0)
5562 /* The rediculous code below is to handle the case of the largest
5563 negative integer. */
5564 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
5568 if (TREE_CONSTANT_OVERFLOW (negative_size))
5571 = size_binop (MINUS_EXPR, bitsize_zero_node,
5572 size_binop (PLUS_EXPR, gnu_size,
5577 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
5579 temp = build (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
5581 return annotate_value (temp);
5584 if (! host_integerp (gnu_size, 1))
5587 size = tree_low_cst (gnu_size, 1);
5589 /* This peculiar test is to make sure that the size fits in an int
5590 on machines where HOST_WIDE_INT is not "int". */
5591 if (tree_low_cst (gnu_size, 1) == size)
5592 return UI_From_Int (size);
5597 /* The only case we handle here is a simple discriminant reference. */
5598 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
5599 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
5600 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)) != 0)
5601 return Create_Node (Discrim_Val,
5602 annotate_value (DECL_DISCRIMINANT_NUMBER
5603 (TREE_OPERAND (gnu_size, 1))),
5608 case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
5609 return annotate_value (TREE_OPERAND (gnu_size, 0));
5611 /* Now just list the operations we handle. */
5612 case COND_EXPR: tcode = Cond_Expr; break;
5613 case PLUS_EXPR: tcode = Plus_Expr; break;
5614 case MINUS_EXPR: tcode = Minus_Expr; break;
5615 case MULT_EXPR: tcode = Mult_Expr; break;
5616 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
5617 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
5618 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
5619 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
5620 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
5621 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
5622 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
5623 case NEGATE_EXPR: tcode = Negate_Expr; break;
5624 case MIN_EXPR: tcode = Min_Expr; break;
5625 case MAX_EXPR: tcode = Max_Expr; break;
5626 case ABS_EXPR: tcode = Abs_Expr; break;
5627 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
5628 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
5629 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
5630 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
5631 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
5632 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
5633 case LT_EXPR: tcode = Lt_Expr; break;
5634 case LE_EXPR: tcode = Le_Expr; break;
5635 case GT_EXPR: tcode = Gt_Expr; break;
5636 case GE_EXPR: tcode = Ge_Expr; break;
5637 case EQ_EXPR: tcode = Eq_Expr; break;
5638 case NE_EXPR: tcode = Ne_Expr; break;
5644 /* Now get each of the operands that's relevant for this code. If any
5645 cannot be expressed as a repinfo node, say we can't. */
5646 for (i = 0; i < 3; i++)
5649 for (i = 0; i < len; i++)
5651 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
5652 if (ops[i] == No_Uint)
5656 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
5657 TREE_COMPLEXITY (gnu_size) = ret;
5661 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
5662 GCC type, set Component_Bit_Offset and Esize to the position and size
5666 annotate_rep (gnat_entity, gnu_type)
5667 Entity_Id gnat_entity;
5672 Entity_Id gnat_field;
5674 /* We operate by first making a list of all field and their positions
5675 (we can get the sizes easily at any time) by a recursive call
5676 and then update all the sizes into the tree. */
5677 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
5678 size_zero_node, bitsize_zero_node,
5681 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
5682 gnat_field = Next_Entity (gnat_field))
5683 if ((Ekind (gnat_field) == E_Component
5684 || (Ekind (gnat_field) == E_Discriminant
5685 && ! Is_Unchecked_Union (Scope (gnat_field)))))
5687 tree parent_offset = bitsize_zero_node;
5690 = purpose_member (gnat_to_gnu_entity (gnat_field, NULL_TREE, 0),
5695 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
5697 /* In this mode the tag and parent components have not been
5698 generated, so we add the appropriate offset to each
5699 component. For a component appearing in the current
5700 extension, the offset is the size of the parent. */
5701 if (Is_Derived_Type (gnat_entity)
5702 && Original_Record_Component (gnat_field) == gnat_field)
5704 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
5707 parent_offset = bitsize_int (POINTER_SIZE);
5710 Set_Component_Bit_Offset
5713 (size_binop (PLUS_EXPR,
5714 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
5715 TREE_VALUE (TREE_VALUE
5716 (TREE_VALUE (gnu_entry)))),
5719 Set_Esize (gnat_field,
5720 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
5722 else if (type_annotate_only
5723 && Is_Tagged_Type (gnat_entity)
5724 && Is_Derived_Type (gnat_entity))
5726 /* If there is no gnu_entry, this is an inherited component whose
5727 position is the same as in the parent type. */
5728 Set_Component_Bit_Offset
5730 Component_Bit_Offset (Original_Record_Component (gnat_field)));
5731 Set_Esize (gnat_field,
5732 Esize (Original_Record_Component (gnat_field)));
5737 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
5738 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
5739 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
5740 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
5741 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
5742 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
5746 compute_field_positions (gnu_type, gnu_list, gnu_pos, gnu_bitpos, offset_align)
5751 unsigned int offset_align;
5754 tree gnu_result = gnu_list;
5756 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
5757 gnu_field = TREE_CHAIN (gnu_field))
5759 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
5760 DECL_FIELD_BIT_OFFSET (gnu_field));
5761 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
5762 DECL_FIELD_OFFSET (gnu_field));
5763 unsigned int our_offset_align
5764 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
5767 = tree_cons (gnu_field,
5768 tree_cons (gnu_our_offset,
5769 tree_cons (size_int (our_offset_align),
5770 gnu_our_bitpos, NULL_TREE),
5774 if (DECL_INTERNAL_P (gnu_field))
5776 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
5777 gnu_our_offset, gnu_our_bitpos,
5784 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
5785 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
5786 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
5787 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
5788 for the size of a field. COMPONENT_P is true if we are being called
5789 to process the Component_Size of GNAT_OBJECT. This is used for error
5790 message handling and to indicate to use the object size of GNU_TYPE.
5791 ZERO_OK is nonzero if a size of zero is permitted; if ZERO_OK is zero,
5792 it means that a size of zero should be treated as an unspecified size. */
5795 validate_size (uint_size, gnu_type, gnat_object, kind, component_p, zero_ok)
5798 Entity_Id gnat_object;
5799 enum tree_code kind;
5803 Node_Id gnat_error_node;
5805 = kind == VAR_DECL ? TYPE_SIZE (gnu_type) : rm_size (gnu_type);
5808 /* Find the node to use for errors. */
5809 if ((Ekind (gnat_object) == E_Component
5810 || Ekind (gnat_object) == E_Discriminant)
5811 && Present (Component_Clause (gnat_object)))
5812 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
5813 else if (Present (Size_Clause (gnat_object)))
5814 gnat_error_node = Expression (Size_Clause (gnat_object));
5816 gnat_error_node = gnat_object;
5818 /* Don't give errors on packed array types; we'll be giving the error on
5819 the type itself soon enough. */
5820 if (Is_Packed_Array_Type (gnat_object))
5821 gnat_error_node = Empty;
5823 /* Return 0 if no size was specified, either because Esize was not Present or
5824 the specified size was zero. */
5825 if (No (uint_size) || uint_size == No_Uint)
5828 /* Get the size as a tree. Give an error if a size was specified, but cannot
5829 be represented as in sizetype. */
5830 size = UI_To_gnu (uint_size, bitsizetype);
5831 if (TREE_OVERFLOW (size))
5833 post_error_ne (component_p ? "component size of & is too large"
5834 : "size of & is too large",
5835 gnat_error_node, gnat_object);
5838 /* Ignore a negative size since that corresponds to our back-annotation.
5839 Also ignore a zero size unless a size clause exists. */
5840 else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && ! zero_ok))
5843 /* The size of objects is always a multiple of a byte. */
5844 if (kind == VAR_DECL
5845 && ! integer_zerop (size_binop (TRUNC_MOD_EXPR, size,
5846 bitsize_unit_node)))
5849 post_error_ne ("component size for& is not a multiple of Storage_Unit",
5850 gnat_error_node, gnat_object);
5852 post_error_ne ("size for& is not a multiple of Storage_Unit",
5853 gnat_error_node, gnat_object);
5857 /* If this is an integral type, the front-end has verified the size, so we
5858 need not do it here (which would entail checking against the bounds).
5859 However, if this is an aliased object, it may not be smaller than the
5860 type of the object. */
5861 if (INTEGRAL_TYPE_P (gnu_type) && ! TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
5862 && ! (kind == VAR_DECL && Is_Aliased (gnat_object)))
5865 /* If the object is a record that contains a template, add the size of
5866 the template to the specified size. */
5867 if (TREE_CODE (gnu_type) == RECORD_TYPE
5868 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
5869 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
5871 /* Modify the size of the type to be that of the maximum size if it has a
5872 discriminant or the size of a thin pointer if this is a fat pointer. */
5873 if (type_size != 0 && CONTAINS_PLACEHOLDER_P (type_size))
5874 type_size = max_size (type_size, 1);
5875 else if (TYPE_FAT_POINTER_P (gnu_type))
5876 type_size = bitsize_int (POINTER_SIZE);
5878 /* If the size of the object is a constant, the new size must not be
5880 if (TREE_CODE (type_size) != INTEGER_CST
5881 || TREE_OVERFLOW (type_size)
5882 || tree_int_cst_lt (size, type_size))
5886 ("component size for& too small{, minimum allowed is ^}",
5887 gnat_error_node, gnat_object, type_size);
5889 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
5890 gnat_error_node, gnat_object, type_size);
5892 if (kind == VAR_DECL && ! component_p
5893 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
5894 && ! tree_int_cst_lt (size, rm_size (gnu_type)))
5895 post_error_ne_tree_2
5896 ("\\size of ^ is not a multiple of alignment (^ bits)",
5897 gnat_error_node, gnat_object, rm_size (gnu_type),
5898 TYPE_ALIGN (gnu_type));
5900 else if (INTEGRAL_TYPE_P (gnu_type))
5901 post_error_ne ("\\size would be legal if & were not aliased!",
5902 gnat_error_node, gnat_object);
5910 /* Similarly, but both validate and process a value of RM_Size. This
5911 routine is only called for types. */
5914 set_rm_size (uint_size, gnu_type, gnat_entity)
5917 Entity_Id gnat_entity;
5919 /* Only give an error if a Value_Size clause was explicitly given.
5920 Otherwise, we'd be duplicating an error on the Size clause. */
5921 Node_Id gnat_attr_node
5922 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
5923 tree old_size = rm_size (gnu_type);
5926 /* Get the size as a tree. Do nothing if none was specified, either
5927 because RM_Size was not Present or if the specified size was zero.
5928 Give an error if a size was specified, but cannot be represented as
5930 if (No (uint_size) || uint_size == No_Uint)
5933 size = UI_To_gnu (uint_size, bitsizetype);
5934 if (TREE_OVERFLOW (size))
5936 if (Present (gnat_attr_node))
5937 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
5943 /* Ignore a negative size since that corresponds to our back-annotation.
5944 Also ignore a zero size unless a size clause exists, a Value_Size
5945 clause exists, or this is an integer type, in which case the
5946 front end will have always set it. */
5947 else if (tree_int_cst_sgn (size) < 0
5948 || (integer_zerop (size) && No (gnat_attr_node)
5949 && ! Has_Size_Clause (gnat_entity)
5950 && ! Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
5953 /* If the old size is self-referential, get the maximum size. */
5954 if (CONTAINS_PLACEHOLDER_P (old_size))
5955 old_size = max_size (old_size, 1);
5957 /* If the size of the object is a constant, the new size must not be
5958 smaller (the front end checks this for scalar types). */
5959 if (TREE_CODE (old_size) != INTEGER_CST
5960 || TREE_OVERFLOW (old_size)
5961 || (AGGREGATE_TYPE_P (gnu_type)
5962 && tree_int_cst_lt (size, old_size)))
5964 if (Present (gnat_attr_node))
5966 ("Value_Size for& too small{, minimum allowed is ^}",
5967 gnat_attr_node, gnat_entity, old_size);
5972 /* Otherwise, set the RM_Size. */
5973 if (TREE_CODE (gnu_type) == INTEGER_TYPE
5974 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
5975 TYPE_RM_SIZE_INT (gnu_type) = size;
5976 else if (TREE_CODE (gnu_type) == ENUMERAL_TYPE)
5977 SET_TYPE_RM_SIZE_ENUM (gnu_type, size);
5978 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
5979 || TREE_CODE (gnu_type) == UNION_TYPE
5980 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
5981 && ! TYPE_IS_FAT_POINTER_P (gnu_type))
5982 SET_TYPE_ADA_SIZE (gnu_type, size);
5985 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
5986 If TYPE is the best type, return it. Otherwise, make a new type. We
5987 only support new integral and pointer types. BIASED_P is nonzero if
5988 we are making a biased type. */
5991 make_type_from_size (type, size_tree, biased_p)
5997 unsigned HOST_WIDE_INT size;
5999 /* If size indicates an error, just return TYPE to avoid propagating the
6000 error. Likewise if it's too large to represent. */
6001 if (size_tree == 0 || ! host_integerp (size_tree, 1))
6004 size = tree_low_cst (size_tree, 1);
6005 switch (TREE_CODE (type))
6009 /* Only do something if the type is not already the proper size and is
6010 not a packed array type. */
6011 if (TYPE_PACKED_ARRAY_TYPE_P (type)
6012 || (TYPE_PRECISION (type) == size
6013 && biased_p == (TREE_CODE (type) == INTEGER_CST
6014 && TYPE_BIASED_REPRESENTATION_P (type))))
6017 size = MIN (size, LONG_LONG_TYPE_SIZE);
6018 new_type = make_signed_type (size);
6019 TREE_TYPE (new_type)
6020 = TREE_TYPE (type) != 0 ? TREE_TYPE (type) : type;
6021 TYPE_MIN_VALUE (new_type)
6022 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
6023 TYPE_MAX_VALUE (new_type)
6024 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
6025 TYPE_BIASED_REPRESENTATION_P (new_type)
6026 = ((TREE_CODE (type) == INTEGER_TYPE
6027 && TYPE_BIASED_REPRESENTATION_P (type))
6029 TREE_UNSIGNED (new_type)
6030 = TREE_UNSIGNED (type) | TYPE_BIASED_REPRESENTATION_P (new_type);
6031 TYPE_RM_SIZE_INT (new_type) = bitsize_int (size);
6035 /* Do something if this is a fat pointer, in which case we
6036 may need to return the thin pointer. */
6037 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
6040 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)));
6044 /* Only do something if this is a thin pointer, in which case we
6045 may need to return the fat pointer. */
6046 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
6048 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
6059 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
6060 a type or object whose present alignment is ALIGN. If this alignment is
6061 valid, return it. Otherwise, give an error and return ALIGN. */
6064 validate_alignment (alignment, gnat_entity, align)
6066 Entity_Id gnat_entity;
6069 Node_Id gnat_error_node = gnat_entity;
6070 unsigned int new_align;
6072 #ifndef MAX_OFILE_ALIGNMENT
6073 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
6076 if (Present (Alignment_Clause (gnat_entity)))
6077 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
6079 /* Don't worry about checking alignment if alignment was not specified
6080 by the source program and we already posted an error for this entity. */
6082 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
6085 /* Within GCC, an alignment is an integer, so we must make sure a
6086 value is specified that fits in that range. Also, alignments of
6087 more than MAX_OFILE_ALIGNMENT can't be supported. */
6089 if (! UI_Is_In_Int_Range (alignment)
6090 || ((new_align = UI_To_Int (alignment))
6091 > MAX_OFILE_ALIGNMENT / BITS_PER_UNIT))
6092 post_error_ne_num ("largest supported alignment for& is ^",
6093 gnat_error_node, gnat_entity,
6094 MAX_OFILE_ALIGNMENT / BITS_PER_UNIT);
6095 else if (! (Present (Alignment_Clause (gnat_entity))
6096 && From_At_Mod (Alignment_Clause (gnat_entity)))
6097 && new_align * BITS_PER_UNIT < align)
6098 post_error_ne_num ("alignment for& must be at least ^",
6099 gnat_error_node, gnat_entity,
6100 align / BITS_PER_UNIT);
6102 align = MAX (align, new_align == 0 ? 1 : new_align * BITS_PER_UNIT);
6107 /* Verify that OBJECT, a type or decl, is something we can implement
6108 atomically. If not, give an error for GNAT_ENTITY. COMP_P is nonzero
6109 if we require atomic components. */
6112 check_ok_for_atomic (object, gnat_entity, comp_p)
6114 Entity_Id gnat_entity;
6117 Node_Id gnat_error_point = gnat_entity;
6119 enum machine_mode mode;
6123 /* There are three case of what OBJECT can be. It can be a type, in which
6124 case we take the size, alignment and mode from the type. It can be a
6125 declaration that was indirect, in which case the relevant values are
6126 that of the type being pointed to, or it can be a normal declaration,
6127 in which case the values are of the decl. The code below assumes that
6128 OBJECT is either a type or a decl. */
6129 if (TYPE_P (object))
6131 mode = TYPE_MODE (object);
6132 align = TYPE_ALIGN (object);
6133 size = TYPE_SIZE (object);
6135 else if (DECL_BY_REF_P (object))
6137 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
6138 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
6139 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
6143 mode = DECL_MODE (object);
6144 align = DECL_ALIGN (object);
6145 size = DECL_SIZE (object);
6148 /* Consider all floating-point types atomic and any types that that are
6149 represented by integers no wider than a machine word. */
6150 if (GET_MODE_CLASS (mode) == MODE_FLOAT
6151 || ((GET_MODE_CLASS (mode) == MODE_INT
6152 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
6153 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
6156 /* For the moment, also allow anything that has an alignment equal
6157 to its size and which is smaller than a word. */
6158 if (size != 0 && TREE_CODE (size) == INTEGER_CST
6159 && compare_tree_int (size, align) == 0
6160 && align <= BITS_PER_WORD)
6163 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
6164 gnat_node = Next_Rep_Item (gnat_node))
6166 if (! comp_p && Nkind (gnat_node) == N_Pragma
6167 && Get_Pragma_Id (Chars (gnat_node)) == Pragma_Atomic)
6168 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
6169 else if (comp_p && Nkind (gnat_node) == N_Pragma
6170 && (Get_Pragma_Id (Chars (gnat_node))
6171 == Pragma_Atomic_Components))
6172 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
6176 post_error_ne ("atomic access to component of & cannot be guaranteed",
6177 gnat_error_point, gnat_entity);
6179 post_error_ne ("atomic access to & cannot be guaranteed",
6180 gnat_error_point, gnat_entity);
6183 /* Given a type T, a FIELD_DECL F, and a replacement value R,
6184 return a new type with all size expressions that contain F
6185 updated by replacing F with R. This is identical to GCC's
6186 substitute_in_type except that it knows about TYPE_INDEX_TYPE.
6187 If F is NULL_TREE, always make a new RECORD_TYPE, even if nothing has
6191 gnat_substitute_in_type (t, f, r)
6197 switch (TREE_CODE (t))
6203 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
6204 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
6206 tree low = substitute_in_expr (TYPE_MIN_VALUE (t), f, r);
6207 tree high = substitute_in_expr (TYPE_MAX_VALUE (t), f, r);
6209 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
6212 new = build_range_type (TREE_TYPE (t), low, high);
6213 if (TYPE_INDEX_TYPE (t))
6214 SET_TYPE_INDEX_TYPE (new,
6215 gnat_substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
6222 if ((TYPE_MIN_VALUE (t) != 0
6223 && CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t)))
6224 || (TYPE_MAX_VALUE (t) != 0
6225 && CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t))))
6227 tree low = 0, high = 0;
6229 if (TYPE_MIN_VALUE (t))
6230 low = substitute_in_expr (TYPE_MIN_VALUE (t), f, r);
6231 if (TYPE_MAX_VALUE (t))
6232 high = substitute_in_expr (TYPE_MAX_VALUE (t), f, r);
6234 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
6238 TYPE_MIN_VALUE (t) = low;
6239 TYPE_MAX_VALUE (t) = high;
6244 tem = gnat_substitute_in_type (TREE_TYPE (t), f, r);
6245 if (tem == TREE_TYPE (t))
6248 return build_complex_type (tem);
6256 /* Don't know how to do these yet. */
6261 tree component = gnat_substitute_in_type (TREE_TYPE (t), f, r);
6262 tree domain = gnat_substitute_in_type (TYPE_DOMAIN (t), f, r);
6264 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
6267 new = build_array_type (component, domain);
6268 TYPE_SIZE (new) = 0;
6269 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
6270 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
6272 TYPE_ALIGN (new) = TYPE_ALIGN (t);
6278 case QUAL_UNION_TYPE:
6282 = (f == NULL_TREE && ! TREE_CONSTANT (TYPE_SIZE (t)));
6283 int field_has_rep = 0;
6284 tree last_field = 0;
6286 tree new = copy_type (t);
6288 /* Start out with no fields, make new fields, and chain them
6289 in. If we haven't actually changed the type of any field,
6290 discard everything we've done and return the old type. */
6292 TYPE_FIELDS (new) = 0;
6293 TYPE_SIZE (new) = 0;
6295 for (field = TYPE_FIELDS (t); field;
6296 field = TREE_CHAIN (field))
6298 tree new_field = copy_node (field);
6300 TREE_TYPE (new_field)
6301 = gnat_substitute_in_type (TREE_TYPE (new_field), f, r);
6303 if (DECL_HAS_REP_P (field) && ! DECL_INTERNAL_P (field))
6305 else if (TREE_TYPE (new_field) != TREE_TYPE (field))
6308 /* If this is an internal field and the type of this field is
6309 a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If
6310 the type just has one element, treat that as the field.
6311 But don't do this if we are processing a QUAL_UNION_TYPE. */
6312 if (TREE_CODE (t) != QUAL_UNION_TYPE
6313 && DECL_INTERNAL_P (new_field)
6314 && (TREE_CODE (TREE_TYPE (new_field)) == UNION_TYPE
6315 || TREE_CODE (TREE_TYPE (new_field)) == RECORD_TYPE))
6317 if (TYPE_FIELDS (TREE_TYPE (new_field)) == 0)
6320 if (TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field))) == 0)
6323 = copy_node (TYPE_FIELDS (TREE_TYPE (new_field)));
6325 /* Make sure omitting the union doesn't change
6327 DECL_ALIGN (next_new_field) = DECL_ALIGN (new_field);
6328 new_field = next_new_field;
6332 DECL_CONTEXT (new_field) = new;
6333 SET_DECL_ORIGINAL_FIELD (new_field,
6334 (DECL_ORIGINAL_FIELD (field) != 0
6335 ? DECL_ORIGINAL_FIELD (field) : field));
6337 /* If the size of the old field was set at a constant,
6338 propagate the size in case the type's size was variable.
6339 (This occurs in the case of a variant or discriminated
6340 record with a default size used as a field of another
6342 DECL_SIZE (new_field)
6343 = TREE_CODE (DECL_SIZE (field)) == INTEGER_CST
6344 ? DECL_SIZE (field) : 0;
6345 DECL_SIZE_UNIT (new_field)
6346 = TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST
6347 ? DECL_SIZE_UNIT (field) : 0;
6349 if (TREE_CODE (t) == QUAL_UNION_TYPE)
6351 tree new_q = substitute_in_expr (DECL_QUALIFIER (field), f, r);
6353 if (new_q != DECL_QUALIFIER (new_field))
6356 /* Do the substitution inside the qualifier and if we find
6357 that this field will not be present, omit it. */
6358 DECL_QUALIFIER (new_field) = new_q;
6360 if (integer_zerop (DECL_QUALIFIER (new_field)))
6364 if (last_field == 0)
6365 TYPE_FIELDS (new) = new_field;
6367 TREE_CHAIN (last_field) = new_field;
6369 last_field = new_field;
6371 /* If this is a qualified type and this field will always be
6372 present, we are done. */
6373 if (TREE_CODE (t) == QUAL_UNION_TYPE
6374 && integer_onep (DECL_QUALIFIER (new_field)))
6378 /* If this used to be a qualified union type, but we now know what
6379 field will be present, make this a normal union. */
6380 if (changed_field && TREE_CODE (new) == QUAL_UNION_TYPE
6381 && (TYPE_FIELDS (new) == 0
6382 || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new)))))
6383 TREE_SET_CODE (new, UNION_TYPE);
6384 else if (! changed_field)
6392 /* If the size was originally a constant use it. */
6393 if (TYPE_SIZE (t) != 0 && TREE_CODE (TYPE_SIZE (t)) == INTEGER_CST
6394 && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST)
6396 TYPE_SIZE (new) = TYPE_SIZE (t);
6397 TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t);
6398 SET_TYPE_ADA_SIZE (new, TYPE_ADA_SIZE (t));
6409 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
6410 needed to represent the object. */
6416 /* For integer types, this is the precision. For record types, we store
6417 the size explicitly. For other types, this is just the size. */
6419 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type) != 0)
6420 return TYPE_RM_SIZE (gnu_type);
6421 else if (TREE_CODE (gnu_type) == RECORD_TYPE
6422 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
6423 /* Return the rm_size of the actual data plus the size of the template. */
6425 size_binop (PLUS_EXPR,
6426 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
6427 DECL_SIZE (TYPE_FIELDS (gnu_type)));
6428 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
6429 || TREE_CODE (gnu_type) == UNION_TYPE
6430 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
6431 && ! TYPE_IS_FAT_POINTER_P (gnu_type)
6432 && TYPE_ADA_SIZE (gnu_type) != 0)
6433 return TYPE_ADA_SIZE (gnu_type);
6435 return TYPE_SIZE (gnu_type);
6438 /* Return an identifier representing the external name to be used for
6439 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
6440 and the specified suffix. */
6443 create_concat_name (gnat_entity, suffix)
6444 Entity_Id gnat_entity;
6447 const char *str = (suffix == 0 ? "" : suffix);
6448 String_Template temp = {1, strlen (str)};
6449 Fat_Pointer fp = {str, &temp};
6451 Get_External_Name_With_Suffix (gnat_entity, fp);
6454 /* A variable using the Stdcall convention (meaning we are running
6455 on a Windows box) live in a DLL. Here we adjust its name to use
6456 the jump-table, the _imp__NAME contains the address for the NAME
6460 Entity_Kind kind = Ekind (gnat_entity);
6461 const char *prefix = "_imp__";
6462 int plen = strlen (prefix);
6464 if ((kind == E_Variable || kind == E_Constant)
6465 && Convention (gnat_entity) == Convention_Stdcall)
6468 for (k = 0; k <= Name_Len; k++)
6469 Name_Buffer [Name_Len - k + plen] = Name_Buffer [Name_Len - k];
6470 strncpy (Name_Buffer, prefix, plen);
6475 return get_identifier (Name_Buffer);
6478 /* Return the name to be used for GNAT_ENTITY. If a type, create a
6479 fully-qualified name, possibly with type information encoding.
6480 Otherwise, return the name. */
6483 get_entity_name (gnat_entity)
6484 Entity_Id gnat_entity;
6486 Get_Encoded_Name (gnat_entity);
6487 return get_identifier (Name_Buffer);
6490 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
6491 string, return a new IDENTIFIER_NODE that is the concatenation of
6492 the name in GNU_ID and SUFFIX. */
6495 concat_id_with_name (gnu_id, suffix)
6499 int len = IDENTIFIER_LENGTH (gnu_id);
6501 strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id),
6502 IDENTIFIER_LENGTH (gnu_id));
6503 strncpy (Name_Buffer + len, "___", 3);
6505 strcpy (Name_Buffer + len, suffix);
6506 return get_identifier (Name_Buffer);
6509 #include "gt-ada-decl.h"