1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2005, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 2, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
20 * MA 02111-1307, USA. *
22 * GNAT was originally developed by the GNAT team at New York University. *
23 * Extensive contributions were provided by Ada Core Technologies Inc. *
25 ****************************************************************************/
29 #include "coretypes.h"
55 /* Provide default values for the macros controlling stack checking.
56 This is copied from GCC's expr.h. */
58 #ifndef STACK_CHECK_BUILTIN
59 #define STACK_CHECK_BUILTIN 0
61 #ifndef STACK_CHECK_PROBE_INTERVAL
62 #define STACK_CHECK_PROBE_INTERVAL 4096
64 #ifndef STACK_CHECK_MAX_FRAME_SIZE
65 #define STACK_CHECK_MAX_FRAME_SIZE \
66 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
68 #ifndef STACK_CHECK_MAX_VAR_SIZE
69 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
72 /* These two variables are used to defer recursively expanding incomplete
73 types while we are processing a record or subprogram type. */
75 static int defer_incomplete_level = 0;
76 static struct incomplete
78 struct incomplete *next;
81 } *defer_incomplete_list = 0;
83 /* These two variables are used to defer emission of debug information for
84 nested incomplete record types */
86 static int defer_debug_level = 0;
87 static tree defer_debug_incomplete_list;
89 static void copy_alias_set (tree, tree);
90 static tree substitution_list (Entity_Id, Entity_Id, tree, bool);
91 static bool allocatable_size_p (tree, bool);
92 static void prepend_attributes (Entity_Id, struct attrib **);
93 static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool);
94 static bool is_variable_size (tree);
95 static tree elaborate_expression_1 (Node_Id, Entity_Id, tree, tree,
97 static tree make_packable_type (tree);
98 static tree gnat_to_gnu_field (Entity_Id, tree, int, bool);
99 static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
101 static int compare_field_bitpos (const PTR, const PTR);
102 static Uint annotate_value (tree);
103 static void annotate_rep (Entity_Id, tree);
104 static tree compute_field_positions (tree, tree, tree, tree, unsigned int);
105 static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool);
106 static void set_rm_size (Uint, tree, Entity_Id);
107 static tree make_type_from_size (tree, tree, bool);
108 static unsigned int validate_alignment (Uint, Entity_Id, unsigned int);
109 static void check_ok_for_atomic (tree, Entity_Id, bool);
110 static int compatible_signatures_p (tree ftype1, tree ftype2);
112 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
113 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
114 refer to an Ada type. */
117 gnat_to_gnu_type (Entity_Id gnat_entity)
121 /* The back end never attempts to annotate generic types */
122 if (Is_Generic_Type (gnat_entity) && type_annotate_only)
123 return void_type_node;
125 /* Convert the ada entity type into a GCC TYPE_DECL node. */
126 gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
127 gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL);
128 return TREE_TYPE (gnu_decl);
131 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
132 entity, this routine returns the equivalent GCC tree for that entity
133 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
136 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
137 initial value (in GCC tree form). This is optional for variables.
138 For renamed entities, GNU_EXPR gives the object being renamed.
140 DEFINITION is nonzero if this call is intended for a definition. This is
141 used for separate compilation where it necessary to know whether an
142 external declaration or a definition should be created if the GCC equivalent
143 was not created previously. The value of 1 is normally used for a non-zero
144 DEFINITION, but a value of 2 is used in special circumstances, defined in
148 gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
151 tree gnu_type = NULL_TREE;
152 /* Contains the gnu XXXX_DECL tree node which is equivalent to the input
153 GNAT tree. This node will be associated with the GNAT node by calling
154 the save_gnu_tree routine at the end of the `switch' statement. */
155 tree gnu_decl = NULL_TREE;
156 /* true if we have already saved gnu_decl as a gnat association. */
158 /* Nonzero if we incremented defer_incomplete_level. */
159 bool this_deferred = false;
160 /* Nonzero if we incremented defer_debug_level. */
161 bool debug_deferred = false;
162 /* Nonzero if we incremented force_global. */
163 bool this_global = false;
164 /* Nonzero if we should check to see if elaborated during processing. */
165 bool maybe_present = false;
166 /* Nonzero if we made GNU_DECL and its type here. */
167 bool this_made_decl = false;
168 struct attrib *attr_list = NULL;
169 bool debug_info_p = (Needs_Debug_Info (gnat_entity)
170 || debug_info_level == DINFO_LEVEL_VERBOSE);
171 Entity_Kind kind = Ekind (gnat_entity);
174 = ((Known_Esize (gnat_entity)
175 && UI_Is_In_Int_Range (Esize (gnat_entity)))
176 ? MIN (UI_To_Int (Esize (gnat_entity)),
177 IN (kind, Float_Kind)
178 ? fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE)
179 : IN (kind, Access_Kind) ? POINTER_SIZE * 2
180 : LONG_LONG_TYPE_SIZE)
181 : LONG_LONG_TYPE_SIZE);
184 = ((Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity)))
185 || From_With_Type (gnat_entity));
186 unsigned int align = 0;
188 /* Since a use of an Itype is a definition, process it as such if it
189 is not in a with'ed unit. */
191 if (!definition && Is_Itype (gnat_entity)
192 && !present_gnu_tree (gnat_entity)
193 && In_Extended_Main_Code_Unit (gnat_entity))
195 /* Ensure that we are in a subprogram mentioned in the Scope
196 chain of this entity, our current scope is global,
197 or that we encountered a task or entry (where we can't currently
198 accurately check scoping). */
199 if (!current_function_decl
200 || DECL_ELABORATION_PROC_P (current_function_decl))
202 process_type (gnat_entity);
203 return get_gnu_tree (gnat_entity);
206 for (gnat_temp = Scope (gnat_entity);
207 Present (gnat_temp); gnat_temp = Scope (gnat_temp))
209 if (Is_Type (gnat_temp))
210 gnat_temp = Underlying_Type (gnat_temp);
212 if (Ekind (gnat_temp) == E_Subprogram_Body)
214 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp)));
216 if (IN (Ekind (gnat_temp), Subprogram_Kind)
217 && Present (Protected_Body_Subprogram (gnat_temp)))
218 gnat_temp = Protected_Body_Subprogram (gnat_temp);
220 if (Ekind (gnat_temp) == E_Entry
221 || Ekind (gnat_temp) == E_Entry_Family
222 || Ekind (gnat_temp) == E_Task_Type
223 || (IN (Ekind (gnat_temp), Subprogram_Kind)
224 && present_gnu_tree (gnat_temp)
225 && (current_function_decl
226 == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0))))
228 process_type (gnat_entity);
229 return get_gnu_tree (gnat_entity);
233 /* This abort means the entity "gnat_entity" has an incorrect scope,
234 i.e. that its scope does not correspond to the subprogram in which
239 /* If this is entity 0, something went badly wrong. */
240 gcc_assert (Present (gnat_entity));
242 /* If we've already processed this entity, return what we got last time.
243 If we are defining the node, we should not have already processed it.
244 In that case, we will abort below when we try to save a new GCC tree for
245 this object. We also need to handle the case of getting a dummy type
246 when a Full_View exists. */
248 if (present_gnu_tree (gnat_entity)
250 || (Is_Type (gnat_entity) && imported_p)))
252 gnu_decl = get_gnu_tree (gnat_entity);
254 if (TREE_CODE (gnu_decl) == TYPE_DECL
255 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))
256 && IN (kind, Incomplete_Or_Private_Kind)
257 && Present (Full_View (gnat_entity)))
259 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
262 save_gnu_tree (gnat_entity, NULL_TREE, false);
263 save_gnu_tree (gnat_entity, gnu_decl, false);
269 /* If this is a numeric or enumeral type, or an access type, a nonzero
270 Esize must be specified unless it was specified by the programmer. */
271 gcc_assert (!Unknown_Esize (gnat_entity)
272 || Has_Size_Clause (gnat_entity)
273 || (!IN (kind, Numeric_Kind) && !IN (kind, Enumeration_Kind)
274 && (!IN (kind, Access_Kind)
275 || kind == E_Access_Protected_Subprogram_Type
276 || kind == E_Access_Subtype)));
278 /* Likewise, RM_Size must be specified for all discrete and fixed-point
280 gcc_assert (!IN (kind, Discrete_Or_Fixed_Point_Kind)
281 || !Unknown_RM_Size (gnat_entity));
283 /* Get the name of the entity and set up the line number and filename of
284 the original definition for use in any decl we make. */
285 gnu_entity_id = get_entity_name (gnat_entity);
286 Sloc_to_locus (Sloc (gnat_entity), &input_location);
288 /* If we get here, it means we have not yet done anything with this
289 entity. If we are not defining it here, it must be external,
290 otherwise we should have defined it already. */
291 gcc_assert (definition || Is_Public (gnat_entity) || type_annotate_only
292 || kind == E_Discriminant || kind == E_Component
294 || (kind == E_Constant && Present (Full_View (gnat_entity)))
295 || IN (kind, Type_Kind));
297 /* For cases when we are not defining (i.e., we are referencing from
298 another compilation unit) Public entities, show we are at global level
299 for the purpose of computing scopes. Don't do this for components or
300 discriminants since the relevant test is whether or not the record is
301 being defined. But do this for Imported functions or procedures in
303 if ((!definition && Is_Public (gnat_entity)
304 && !Is_Statically_Allocated (gnat_entity)
305 && kind != E_Discriminant && kind != E_Component)
306 || (Is_Imported (gnat_entity)
307 && (kind == E_Function || kind == E_Procedure)))
308 force_global++, this_global = true;
310 /* Handle any attributes directly attached to the entity. */
311 if (Has_Gigi_Rep_Item (gnat_entity))
312 prepend_attributes (gnat_entity, &attr_list);
314 /* Machine_Attributes on types are expected to be propagated to subtypes.
315 The corresponding Gigi_Rep_Items are only attached to the first subtype
316 though, so we handle the propagation here. */
317 if (Is_Type (gnat_entity) && Base_Type (gnat_entity) != gnat_entity
318 && !Is_First_Subtype (gnat_entity)
319 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity))))
320 prepend_attributes (First_Subtype (Base_Type (gnat_entity)), &attr_list);
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
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 /* We used to special case VMS exceptions here to directly map them to
377 their associated condition code. Since this code had to be masked
378 dynamically to strip off the severity bits, this caused trouble in
379 the GCC/ZCX case because the "type" pointers we store in the tables
380 have to be static. We now don't special case here anymore, and let
381 the regular processing take place, which leaves us with a regular
382 exception data object for VMS exceptions too. The condition code
383 mapping is taken care of by the front end and the bitmasking by the
390 /* The GNAT record where the component was defined. */
391 Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity));
393 /* If the variable is an inherited record component (in the case of
394 extended record types), just return the inherited entity, which
395 must be a FIELD_DECL. Likewise for discriminants.
396 For discriminants of untagged records which have explicit
397 stored discriminants, return the entity for the corresponding
398 stored discriminant. Also use Original_Record_Component
399 if the record has a private extension. */
401 if (Present (Original_Record_Component (gnat_entity))
402 && Original_Record_Component (gnat_entity) != gnat_entity)
405 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity),
406 gnu_expr, definition);
411 /* If the enclosing record has explicit stored discriminants,
412 then it is an untagged record. If the Corresponding_Discriminant
413 is not empty then this must be a renamed discriminant and its
414 Original_Record_Component must point to the corresponding explicit
415 stored discriminant (i.e., we should have taken the previous
418 else if (Present (Corresponding_Discriminant (gnat_entity))
419 && Is_Tagged_Type (gnat_record))
421 /* A tagged record has no explicit stored discriminants. */
423 gcc_assert (First_Discriminant (gnat_record)
424 == First_Stored_Discriminant (gnat_record));
426 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity),
427 gnu_expr, definition);
432 /* If the enclosing record has explicit stored discriminants,
433 then it is an untagged record. If the Corresponding_Discriminant
434 is not empty then this must be a renamed discriminant and its
435 Original_Record_Component must point to the corresponding explicit
436 stored discriminant (i.e., we should have taken the first
439 else if (Present (Corresponding_Discriminant (gnat_entity))
440 && (First_Discriminant (gnat_record)
441 != First_Stored_Discriminant (gnat_record)))
444 /* Otherwise, if we are not defining this and we have no GCC type
445 for the containing record, make one for it. Then we should
446 have made our own equivalent. */
447 else if (!definition && !present_gnu_tree (gnat_record))
449 /* ??? If this is in a record whose scope is a protected
450 type and we have an Original_Record_Component, use it.
451 This is a workaround for major problems in protected type
454 Entity_Id Scop = Scope (Scope (gnat_entity));
455 if ((Is_Protected_Type (Scop)
456 || (Is_Private_Type (Scop)
457 && Present (Full_View (Scop))
458 && Is_Protected_Type (Full_View (Scop))))
459 && Present (Original_Record_Component (gnat_entity)))
462 = gnat_to_gnu_entity (Original_Record_Component
464 gnu_expr, definition);
469 gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0);
470 gnu_decl = get_gnu_tree (gnat_entity);
476 /* Here we have no GCC type and this is a reference rather than a
477 definition. This should never happen. Most likely the cause is a
478 reference before declaration in the gnat tree for gnat_entity. */
482 case E_Loop_Parameter:
483 case E_Out_Parameter:
486 /* Simple variables, loop variables, OUT parameters, and exceptions. */
489 bool used_by_ref = false;
491 = ((kind == E_Constant || kind == E_Variable)
492 && !Is_Statically_Allocated (gnat_entity)
493 && Is_True_Constant (gnat_entity)
494 && (((Nkind (Declaration_Node (gnat_entity))
495 == N_Object_Declaration)
496 && Present (Expression (Declaration_Node (gnat_entity))))
497 || Present (Renamed_Object (gnat_entity))));
498 bool inner_const_flag = const_flag;
499 bool static_p = Is_Statically_Allocated (gnat_entity);
500 tree gnu_ext_name = NULL_TREE;
501 tree renamed_obj = NULL_TREE;
503 if (Present (Renamed_Object (gnat_entity)) && !definition)
505 if (kind == E_Exception)
506 gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity),
509 gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity));
512 /* Get the type after elaborating the renamed object. */
513 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
515 /* If this is a loop variable, its type should be the base type.
516 This is because the code for processing a loop determines whether
517 a normal loop end test can be done by comparing the bounds of the
518 loop against those of the base type, which is presumed to be the
519 size used for computation. But this is not correct when the size
520 of the subtype is smaller than the type. */
521 if (kind == E_Loop_Parameter)
522 gnu_type = get_base_type (gnu_type);
524 /* Reject non-renamed objects whose types are unconstrained arrays or
525 any object whose type is a dummy type or VOID_TYPE. */
527 if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
528 && No (Renamed_Object (gnat_entity)))
529 || TYPE_IS_DUMMY_P (gnu_type)
530 || TREE_CODE (gnu_type) == VOID_TYPE)
532 gcc_assert (type_annotate_only);
533 return error_mark_node;
536 /* If an alignment is specified, use it if valid. Note that
537 exceptions are objects but don't have alignments. We must do this
538 before we validate the size, since the alignment can affect the
540 if (kind != E_Exception && Known_Alignment (gnat_entity))
542 gcc_assert (Present (Alignment (gnat_entity)));
543 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
544 TYPE_ALIGN (gnu_type));
545 gnu_type = maybe_pad_type (gnu_type, NULL_TREE, align,
546 gnat_entity, "PAD", 0, definition, 1);
549 /* If we are defining the object, see if it has a Size value and
550 validate it if so. If we are not defining the object and a Size
551 clause applies, simply retrieve the value. We don't want to ignore
552 the clause and it is expected to have been validated already. Then
553 get the new type, if any. */
555 gnu_size = validate_size (Esize (gnat_entity), gnu_type,
556 gnat_entity, VAR_DECL, false,
557 Has_Size_Clause (gnat_entity));
558 else if (Has_Size_Clause (gnat_entity))
559 gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype);
564 = make_type_from_size (gnu_type, gnu_size,
565 Has_Biased_Representation (gnat_entity));
567 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0))
568 gnu_size = NULL_TREE;
571 /* If this object has self-referential size, it must be a record with
572 a default value. We are supposed to allocate an object of the
573 maximum size in this case unless it is a constant with an
574 initializing expression, in which case we can get the size from
575 that. Note that the resulting size may still be a variable, so
576 this may end up with an indirect allocation. */
578 if (No (Renamed_Object (gnat_entity))
579 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
581 if (gnu_expr && kind == E_Constant)
583 = SUBSTITUTE_PLACEHOLDER_IN_EXPR
584 (TYPE_SIZE (TREE_TYPE (gnu_expr)), gnu_expr);
586 /* We may have no GNU_EXPR because No_Initialization is
587 set even though there's an Expression. */
588 else if (kind == E_Constant
589 && (Nkind (Declaration_Node (gnat_entity))
590 == N_Object_Declaration)
591 && Present (Expression (Declaration_Node (gnat_entity))))
593 = TYPE_SIZE (gnat_to_gnu_type
595 (Expression (Declaration_Node (gnat_entity)))));
597 gnu_size = max_size (TYPE_SIZE (gnu_type), true);
600 /* If the size is zero bytes, make it one byte since some linkers have
601 trouble with zero-sized objects. If the object will have a
602 template, that will make it nonzero so don't bother. Also avoid
603 doing that for an object renaming or an object with an address
604 clause, as we would lose useful information on the view size
605 (e.g. for null array slices) and we are not allocating the object
607 if (((gnu_size && integer_zerop (gnu_size))
608 || (TYPE_SIZE (gnu_type) && integer_zerop (TYPE_SIZE (gnu_type))))
609 && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
610 || !Is_Array_Type (Etype (gnat_entity)))
611 && !Present (Renamed_Object (gnat_entity))
612 && !Present (Address_Clause (gnat_entity)))
613 gnu_size = bitsize_unit_node;
615 /* If this is an atomic object with no specified size and alignment,
616 but where the size of the type is a constant, set the alignment to
617 the lowest power of two greater than the size, or to the
618 biggest meaningful alignment, whichever is smaller. */
620 if (Is_Atomic (gnat_entity) && !gnu_size && align == 0
621 && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)
623 if (!host_integerp (TYPE_SIZE (gnu_type), 1)
624 || 0 <= compare_tree_int (TYPE_SIZE (gnu_type),
626 align = BIGGEST_ALIGNMENT;
628 align = ((unsigned int) 1
629 << (floor_log2 (tree_low_cst
630 (TYPE_SIZE (gnu_type), 1) - 1)
634 /* If the object is set to have atomic components, find the component
635 type and validate it.
637 ??? Note that we ignore Has_Volatile_Components on objects; it's
638 not at all clear what to do in that case. */
640 if (Has_Atomic_Components (gnat_entity))
642 tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE
643 ? TREE_TYPE (gnu_type) : gnu_type);
645 while (TREE_CODE (gnu_inner) == ARRAY_TYPE
646 && TYPE_MULTI_ARRAY_P (gnu_inner))
647 gnu_inner = TREE_TYPE (gnu_inner);
649 check_ok_for_atomic (gnu_inner, gnat_entity, true);
652 /* Now check if the type of the object allows atomic access. Note
653 that we must test the type, even if this object has size and
654 alignment to allow such access, because we will be going
655 inside the padded record to assign to the object. We could fix
656 this by always copying via an intermediate value, but it's not
657 clear it's worth the effort. */
658 if (Is_Atomic (gnat_entity))
659 check_ok_for_atomic (gnu_type, gnat_entity, false);
661 /* If this is an aliased object with an unconstrained nominal subtype,
662 make a type that includes the template. */
663 if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity))
664 && Is_Array_Type (Etype (gnat_entity))
665 && !type_annotate_only)
668 = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity))));
670 = TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_fat))));
673 = build_unc_object_type (gnu_temp_type, gnu_type,
674 concat_id_with_name (gnu_entity_id,
678 #ifdef MINIMUM_ATOMIC_ALIGNMENT
679 /* If the size is a constant and no alignment is specified, force
680 the alignment to be the minimum valid atomic alignment. The
681 restriction on constant size avoids problems with variable-size
682 temporaries; if the size is variable, there's no issue with
683 atomic access. Also don't do this for a constant, since it isn't
684 necessary and can interfere with constant replacement. Finally,
685 do not do it for Out parameters since that creates an
686 size inconsistency with In parameters. */
687 if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type)
688 && !FLOAT_TYPE_P (gnu_type)
689 && !const_flag && No (Renamed_Object (gnat_entity))
690 && !imported_p && No (Address_Clause (gnat_entity))
691 && kind != E_Out_Parameter
692 && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST
693 : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST))
694 align = MINIMUM_ATOMIC_ALIGNMENT;
697 /* Make a new type with the desired size and alignment, if needed. */
698 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity,
699 "PAD", false, definition, true);
701 /* Make a volatile version of this object's type if we are to
702 make the object volatile. Note that 13.3(19) says that we
703 should treat other types of objects as volatile as well. */
704 if ((Treat_As_Volatile (gnat_entity)
705 || Is_Exported (gnat_entity)
706 || Is_Imported (gnat_entity)
707 || Present (Address_Clause (gnat_entity)))
708 && !TYPE_VOLATILE (gnu_type))
709 gnu_type = build_qualified_type (gnu_type,
710 (TYPE_QUALS (gnu_type)
711 | TYPE_QUAL_VOLATILE));
713 /* Convert the expression to the type of the object except in the
714 case where the object's type is unconstrained or the object's type
715 is a padded record whose field is of self-referential size. In
716 the former case, converting will generate unnecessary evaluations
717 of the CONSTRUCTOR to compute the size and in the latter case, we
718 want to only copy the actual data. */
720 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
721 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
722 && !(TREE_CODE (gnu_type) == RECORD_TYPE
723 && TYPE_IS_PADDING_P (gnu_type)
724 && (CONTAINS_PLACEHOLDER_P
725 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
726 gnu_expr = convert (gnu_type, gnu_expr);
728 /* See if this is a renaming. If this is a constant renaming, treat
729 it as a normal variable whose initial value is what is being
730 renamed. We cannot do this if the type is unconstrained or
733 Otherwise, if what we are renaming is a reference, we can simply
734 return a stabilized version of that reference, after forcing any
735 SAVE_EXPRs to be evaluated. But, if this is at global level, we
736 can only do this if we know no SAVE_EXPRs will be made.
738 Otherwise, make this into a constant pointer to the object we are
741 if (Present (Renamed_Object (gnat_entity)))
743 /* If the renamed object had padding, strip off the reference
744 to the inner object and reset our type. */
745 if (TREE_CODE (gnu_expr) == COMPONENT_REF
746 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))
748 && (TYPE_IS_PADDING_P
749 (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))))
751 gnu_expr = TREE_OPERAND (gnu_expr, 0);
752 gnu_type = TREE_TYPE (gnu_expr);
756 && !TREE_SIDE_EFFECTS (gnu_expr)
757 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
758 && TYPE_MODE (gnu_type) != BLKmode
759 && Ekind (Etype (gnat_entity)) != E_Class_Wide_Type
760 && !Is_Array_Type (Etype (gnat_entity)))
763 /* If this is a declaration or reference that we can stabilize,
764 just use that declaration or reference as this entity unless
765 the latter has to be materialized. */
766 else if ((DECL_P (gnu_expr) || REFERENCE_CLASS_P (gnu_expr))
767 && !Materialize_Entity (gnat_entity)
768 && (!global_bindings_p ()
769 || (staticp (gnu_expr)
770 && !TREE_SIDE_EFFECTS (gnu_expr))))
772 gnu_decl = gnat_stabilize_reference (gnu_expr, true);
773 save_gnu_tree (gnat_entity, gnu_decl, true);
778 /* Otherwise, make this into a constant pointer to the object we
779 are to rename and attach the object to the pointer. We need
780 to stabilize too since the renaming evaluation may directly
781 reference the renamed object instead of the pointer we will
782 attach it to. We don't want variables in the expression to
783 be evaluated every time the renaming is used, since their
784 value may change in between. */
787 bool has_side_effects = TREE_SIDE_EFFECTS (gnu_expr);
788 inner_const_flag = TREE_READONLY (gnu_expr);
790 gnu_type = build_reference_type (gnu_type);
791 renamed_obj = gnat_stabilize_reference (gnu_expr, true);
792 gnu_expr = build_unary_op (ADDR_EXPR, gnu_type, renamed_obj);
794 if (!global_bindings_p ())
796 /* If the original expression had side effects, put a
797 SAVE_EXPR around this whole thing. */
798 if (has_side_effects)
799 gnu_expr = save_expr (gnu_expr);
804 gnu_size = NULL_TREE;
809 /* If this is an aliased object whose nominal subtype is unconstrained,
810 the object is a record that contains both the template and
811 the object. If there is an initializer, it will have already
812 been converted to the right type, but we need to create the
813 template if there is no initializer. */
814 else if (definition && TREE_CODE (gnu_type) == RECORD_TYPE
815 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type)
816 /* Beware that padding might have been introduced
817 via maybe_pad_type above. */
818 || (TYPE_IS_PADDING_P (gnu_type)
819 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type)))
821 && TYPE_CONTAINS_TEMPLATE_P
822 (TREE_TYPE (TYPE_FIELDS (gnu_type)))))
826 = TYPE_IS_PADDING_P (gnu_type)
827 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type)))
828 : TYPE_FIELDS (gnu_type);
831 = gnat_build_constructor
835 build_template (TREE_TYPE (template_field),
836 TREE_TYPE (TREE_CHAIN (template_field)),
841 /* If this is a pointer and it does not have an initializing
842 expression, initialize it to NULL, unless the object is
845 && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type))
846 && !Is_Imported (gnat_entity) && !gnu_expr)
847 gnu_expr = integer_zero_node;
849 /* If we are defining the object and it has an Address clause we must
850 get the address expression from the saved GCC tree for the
851 object if the object has a Freeze_Node. Otherwise, we elaborate
852 the address expression here since the front-end has guaranteed
853 in that case that the elaboration has no effects. Note that
854 only the latter mechanism is currently in use. */
855 if (definition && Present (Address_Clause (gnat_entity)))
858 = (present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity)
859 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
861 save_gnu_tree (gnat_entity, NULL_TREE, false);
863 /* Ignore the size. It's either meaningless or was handled
865 gnu_size = NULL_TREE;
866 gnu_type = build_reference_type (gnu_type);
867 gnu_address = convert (gnu_type, gnu_address);
869 const_flag = !Is_Public (gnat_entity);
871 /* If we don't have an initializing expression for the underlying
872 variable, the initializing expression for the pointer is the
873 specified address. Otherwise, we have to make a COMPOUND_EXPR
874 to assign both the address and the initial value. */
876 gnu_expr = gnu_address;
879 = build2 (COMPOUND_EXPR, gnu_type,
881 (MODIFY_EXPR, NULL_TREE,
882 build_unary_op (INDIRECT_REF, NULL_TREE,
888 /* If it has an address clause and we are not defining it, mark it
889 as an indirect object. Likewise for Stdcall objects that are
891 if ((!definition && Present (Address_Clause (gnat_entity)))
892 || (Is_Imported (gnat_entity)
893 && Convention (gnat_entity) == Convention_Stdcall))
895 gnu_type = build_reference_type (gnu_type);
896 gnu_size = NULL_TREE;
900 /* If we are at top level and this object is of variable size,
901 make the actual type a hidden pointer to the real type and
902 make the initializer be a memory allocation and initialization.
903 Likewise for objects we aren't defining (presumed to be
904 external references from other packages), but there we do
905 not set up an initialization.
907 If the object's size overflows, make an allocator too, so that
908 Storage_Error gets raised. Note that we will never free
909 such memory, so we presume it never will get allocated. */
911 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type),
912 global_bindings_p () || !definition
915 && ! allocatable_size_p (gnu_size,
916 global_bindings_p () || !definition
919 gnu_type = build_reference_type (gnu_type);
920 gnu_size = NULL_TREE;
924 /* In case this was a aliased object whose nominal subtype is
925 unconstrained, the pointer above will be a thin pointer and
926 build_allocator will automatically make the template.
928 If we have a template initializer only (that we made above),
929 pretend there is none and rely on what build_allocator creates
930 again anyway. Otherwise (if we have a full initializer), get
931 the data part and feed that to build_allocator. */
935 tree gnu_alloc_type = TREE_TYPE (gnu_type);
937 if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE
938 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type))
941 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type)));
943 if (TREE_CODE (gnu_expr) == CONSTRUCTOR
945 TREE_CHAIN (CONSTRUCTOR_ELTS (gnu_expr)) == NULL_TREE)
949 = build_component_ref
950 (gnu_expr, NULL_TREE,
951 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))),
955 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST
956 && TREE_CONSTANT_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type))
957 && !Is_Imported (gnat_entity))
958 post_error ("Storage_Error will be raised at run-time?",
961 gnu_expr = build_allocator (gnu_alloc_type, gnu_expr,
962 gnu_type, 0, 0, gnat_entity);
966 gnu_expr = NULL_TREE;
971 /* If this object would go into the stack and has an alignment
972 larger than the default largest alignment, make a variable
973 to hold the "aligning type" with a modified initial value,
974 if any, then point to it and make that the value of this
975 variable, which is now indirect. */
976 if (!global_bindings_p () && !static_p && definition
977 && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT)
980 = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type),
981 TYPE_SIZE_UNIT (gnu_type));
985 = create_var_decl (create_concat_name (gnat_entity, "ALIGN"),
986 NULL_TREE, gnu_new_type, gnu_expr, false,
987 false, false, false, NULL, gnat_entity);
991 (build_binary_op (MODIFY_EXPR, NULL_TREE,
993 (gnu_new_var, NULL_TREE,
994 TYPE_FIELDS (gnu_new_type), false),
998 gnu_type = build_reference_type (gnu_type);
1001 (ADDR_EXPR, gnu_type,
1002 build_component_ref (gnu_new_var, NULL_TREE,
1003 TYPE_FIELDS (gnu_new_type), false));
1005 gnu_size = NULL_TREE;
1011 gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type)
1012 | TYPE_QUAL_CONST));
1014 /* Convert the expression to the type of the object except in the
1015 case where the object's type is unconstrained or the object's type
1016 is a padded record whose field is of self-referential size. In
1017 the former case, converting will generate unnecessary evaluations
1018 of the CONSTRUCTOR to compute the size and in the latter case, we
1019 want to only copy the actual data. */
1021 && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE
1022 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
1023 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1024 && TYPE_IS_PADDING_P (gnu_type)
1025 && (CONTAINS_PLACEHOLDER_P
1026 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))))
1027 gnu_expr = convert (gnu_type, gnu_expr);
1029 /* If this name is external or there was a name specified, use it,
1030 unless this is a VMS exception object since this would conflict
1031 with the symbol we need to export in addition. Don't use the
1032 Interface_Name if there is an address clause (see CD30005). */
1033 if (!Is_VMS_Exception (gnat_entity)
1034 && ((Present (Interface_Name (gnat_entity))
1035 && No (Address_Clause (gnat_entity)))
1036 || (Is_Public (gnat_entity)
1037 && (!Is_Imported (gnat_entity)
1038 || Is_Exported (gnat_entity)))))
1039 gnu_ext_name = create_concat_name (gnat_entity, 0);
1041 /* If this is constant initialized to a static constant and the
1042 object has an aggregate type, force it to be statically
1044 if (const_flag && gnu_expr && TREE_CONSTANT (gnu_expr)
1045 && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1)
1046 && (AGGREGATE_TYPE_P (gnu_type)
1047 && !(TREE_CODE (gnu_type) == RECORD_TYPE
1048 && TYPE_IS_PADDING_P (gnu_type))))
1051 gnu_decl = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1052 gnu_expr, const_flag,
1053 Is_Public (gnat_entity),
1054 imported_p || !definition,
1055 static_p, attr_list, gnat_entity);
1056 DECL_BY_REF_P (gnu_decl) = used_by_ref;
1057 DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag;
1058 if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
1060 SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
1061 DECL_RENAMING_GLOBAL_P (gnu_decl) = global_bindings_p ();
1064 /* If we have an address clause and we've made this indirect, it's
1065 not enough to merely mark the type as volatile since volatile
1066 references only conflict with other volatile references while this
1067 reference must conflict with all other references. So ensure that
1068 the dereferenced value has alias set 0. */
1069 if (Present (Address_Clause (gnat_entity)) && used_by_ref)
1070 DECL_POINTER_ALIAS_SET (gnu_decl) = 0;
1072 if (definition && DECL_SIZE (gnu_decl)
1073 && get_block_jmpbuf_decl ()
1074 && (TREE_CODE (DECL_SIZE (gnu_decl)) != INTEGER_CST
1075 || (flag_stack_check && !STACK_CHECK_BUILTIN
1076 && 0 < compare_tree_int (DECL_SIZE_UNIT (gnu_decl),
1077 STACK_CHECK_MAX_VAR_SIZE))))
1078 add_stmt_with_node (build_call_1_expr
1079 (update_setjmp_buf_decl,
1080 build_unary_op (ADDR_EXPR, NULL_TREE,
1081 get_block_jmpbuf_decl ())),
1084 /* If this is a public constant or we're not optimizing and we're not
1085 making a VAR_DECL for it, make one just for export or debugger
1086 use. Likewise if the address is taken or if the object or type is
1088 if (definition && TREE_CODE (gnu_decl) == CONST_DECL
1089 && (Is_Public (gnat_entity)
1091 || Address_Taken (gnat_entity)
1092 || Is_Aliased (gnat_entity)
1093 || Is_Aliased (Etype (gnat_entity))))
1096 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
1097 gnu_expr, false, Is_Public (gnat_entity),
1098 false, static_p, NULL, gnat_entity);
1100 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var);
1103 /* If this is declared in a block that contains an block with an
1104 exception handler, we must force this variable in memory to
1105 suppress an invalid optimization. */
1106 if (Has_Nested_Block_With_Handler (Scope (gnat_entity))
1107 && Exception_Mechanism != GCC_ZCX)
1108 TREE_ADDRESSABLE (gnu_decl) = 1;
1110 /* Back-annotate the Alignment of the object if not already in the
1111 tree. Likewise for Esize if the object is of a constant size.
1112 But if the "object" is actually a pointer to an object, the
1113 alignment and size are the same as the type, so don't back-annotate
1114 the values for the pointer. */
1115 if (!used_by_ref && Unknown_Alignment (gnat_entity))
1116 Set_Alignment (gnat_entity,
1117 UI_From_Int (DECL_ALIGN (gnu_decl) / BITS_PER_UNIT));
1119 if (!used_by_ref && Unknown_Esize (gnat_entity)
1120 && DECL_SIZE (gnu_decl))
1122 tree gnu_back_size = DECL_SIZE (gnu_decl);
1124 if (TREE_CODE (TREE_TYPE (gnu_decl)) == RECORD_TYPE
1125 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_decl)))
1127 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN
1128 (TYPE_FIELDS (TREE_TYPE (gnu_decl)))));
1130 Set_Esize (gnat_entity, annotate_value (gnu_back_size));
1136 /* Return a TYPE_DECL for "void" that we previously made. */
1137 gnu_decl = void_type_decl_node;
1140 case E_Enumeration_Type:
1141 /* A special case, for the types Character and Wide_Character in
1142 Standard, we do not list all the literals. So if the literals
1143 are not specified, make this an unsigned type. */
1144 if (No (First_Literal (gnat_entity)))
1146 gnu_type = make_unsigned_type (esize);
1150 /* Normal case of non-character type, or non-Standard character type */
1152 /* Here we have a list of enumeral constants in First_Literal.
1153 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1154 the list to be places into TYPE_FIELDS. Each node in the list
1155 is a TREE_LIST node whose TREE_VALUE is the literal name
1156 and whose TREE_PURPOSE is the value of the literal.
1158 Esize contains the number of bits needed to represent the enumeral
1159 type, Type_Low_Bound also points to the first literal and
1160 Type_High_Bound points to the last literal. */
1162 Entity_Id gnat_literal;
1163 tree gnu_literal_list = NULL_TREE;
1165 if (Is_Unsigned_Type (gnat_entity))
1166 gnu_type = make_unsigned_type (esize);
1168 gnu_type = make_signed_type (esize);
1170 TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
1172 for (gnat_literal = First_Literal (gnat_entity);
1173 Present (gnat_literal);
1174 gnat_literal = Next_Literal (gnat_literal))
1176 tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
1179 = create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
1180 gnu_type, gnu_value, true, false, false,
1181 false, NULL, gnat_literal);
1183 save_gnu_tree (gnat_literal, gnu_literal, false);
1184 gnu_literal_list = tree_cons (DECL_NAME (gnu_literal),
1185 gnu_value, gnu_literal_list);
1188 TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
1190 /* Note that the bounds are updated at the end of this function
1191 because to avoid an infinite recursion when we get the bounds of
1192 this type, since those bounds are objects of this type. */
1196 case E_Signed_Integer_Type:
1197 case E_Ordinary_Fixed_Point_Type:
1198 case E_Decimal_Fixed_Point_Type:
1199 /* For integer types, just make a signed type the appropriate number
1201 gnu_type = make_signed_type (esize);
1204 case E_Modular_Integer_Type:
1205 /* For modular types, make the unsigned type of the proper number of
1206 bits and then set up the modulus, if required. */
1208 enum machine_mode mode;
1212 if (Is_Packed_Array_Type (gnat_entity))
1213 esize = UI_To_Int (RM_Size (gnat_entity));
1215 /* Find the smallest mode at least ESIZE bits wide and make a class
1218 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1219 GET_MODE_BITSIZE (mode) < esize;
1220 mode = GET_MODE_WIDER_MODE (mode))
1223 gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode));
1224 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
1225 = Is_Packed_Array_Type (gnat_entity);
1227 /* Get the modulus in this type. If it overflows, assume it is because
1228 it is equal to 2**Esize. Note that there is no overflow checking
1229 done on unsigned type, so we detect the overflow by looking for
1230 a modulus of zero, which is otherwise invalid. */
1231 gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type);
1233 if (!integer_zerop (gnu_modulus))
1235 TYPE_MODULAR_P (gnu_type) = 1;
1236 SET_TYPE_MODULUS (gnu_type, gnu_modulus);
1237 gnu_high = fold (build2 (MINUS_EXPR, gnu_type, gnu_modulus,
1238 convert (gnu_type, integer_one_node)));
1241 /* If we have to set TYPE_PRECISION different from its natural value,
1242 make a subtype to do do. Likewise if there is a modulus and
1243 it is not one greater than TYPE_MAX_VALUE. */
1244 if (TYPE_PRECISION (gnu_type) != esize
1245 || (TYPE_MODULAR_P (gnu_type)
1246 && !tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high)))
1248 tree gnu_subtype = make_node (INTEGER_TYPE);
1250 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT");
1251 TREE_TYPE (gnu_subtype) = gnu_type;
1252 TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type);
1253 TYPE_MAX_VALUE (gnu_subtype)
1254 = TYPE_MODULAR_P (gnu_type)
1255 ? gnu_high : TYPE_MAX_VALUE (gnu_type);
1256 TYPE_PRECISION (gnu_subtype) = esize;
1257 TYPE_UNSIGNED (gnu_subtype) = 1;
1258 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
1259 TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype)
1260 = Is_Packed_Array_Type (gnat_entity);
1261 layout_type (gnu_subtype);
1263 gnu_type = gnu_subtype;
1268 case E_Signed_Integer_Subtype:
1269 case E_Enumeration_Subtype:
1270 case E_Modular_Integer_Subtype:
1271 case E_Ordinary_Fixed_Point_Subtype:
1272 case E_Decimal_Fixed_Point_Subtype:
1274 /* For integral subtypes, we make a new INTEGER_TYPE. Note
1275 that we do not want to call build_range_type since we would
1276 like each subtype node to be distinct. This will be important
1277 when memory aliasing is implemented.
1279 The TREE_TYPE field of the INTEGER_TYPE we make points to the
1280 parent type; this fact is used by the arithmetic conversion
1283 We elaborate the Ancestor_Subtype if it is not in the current
1284 unit and one of our bounds is non-static. We do this to ensure
1285 consistent naming in the case where several subtypes share the same
1286 bounds by always elaborating the first such subtype first, thus
1290 && Present (Ancestor_Subtype (gnat_entity))
1291 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1292 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1293 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1294 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1295 gnu_expr, definition);
1297 gnu_type = make_node (INTEGER_TYPE);
1298 if (Is_Packed_Array_Type (gnat_entity))
1300 esize = UI_To_Int (RM_Size (gnat_entity));
1301 TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
1304 TYPE_PRECISION (gnu_type) = esize;
1305 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1307 TYPE_MIN_VALUE (gnu_type)
1308 = convert (TREE_TYPE (gnu_type),
1309 elaborate_expression (Type_Low_Bound (gnat_entity),
1311 get_identifier ("L"), definition, 1,
1312 Needs_Debug_Info (gnat_entity)));
1314 TYPE_MAX_VALUE (gnu_type)
1315 = convert (TREE_TYPE (gnu_type),
1316 elaborate_expression (Type_High_Bound (gnat_entity),
1318 get_identifier ("U"), definition, 1,
1319 Needs_Debug_Info (gnat_entity)));
1321 /* One of the above calls might have caused us to be elaborated,
1322 so don't blow up if so. */
1323 if (present_gnu_tree (gnat_entity))
1325 maybe_present = true;
1329 TYPE_BIASED_REPRESENTATION_P (gnu_type)
1330 = Has_Biased_Representation (gnat_entity);
1332 /* This should be an unsigned type if the lower bound is constant
1333 and non-negative or if the base type is unsigned; a signed type
1335 TYPE_UNSIGNED (gnu_type)
1336 = (TYPE_UNSIGNED (TREE_TYPE (gnu_type))
1337 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST
1338 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0)
1339 || TYPE_BIASED_REPRESENTATION_P (gnu_type)
1340 || Is_Unsigned_Type (gnat_entity));
1342 layout_type (gnu_type);
1344 /* If the type we are dealing with is to represent a packed array,
1345 we need to have the bits left justified on big-endian targets
1346 and right justified on little-endian targets. We also need to
1347 ensure that when the value is read (e.g. for comparison of two
1348 such values), we only get the good bits, since the unused bits
1349 are uninitialized. Both goals are accomplished by wrapping the
1350 modular value in an enclosing struct. */
1351 if (Is_Packed_Array_Type (gnat_entity))
1353 tree gnu_field_type = gnu_type;
1356 TYPE_RM_SIZE_NUM (gnu_field_type)
1357 = UI_To_gnu (RM_Size (gnat_entity), bitsizetype);
1358 gnu_type = make_node (RECORD_TYPE);
1359 TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
1360 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
1361 TYPE_PACKED (gnu_type) = 1;
1363 /* Create a stripped-down declaration of the original type, mainly
1365 create_type_decl (get_entity_name (gnat_entity), gnu_field_type,
1366 NULL, true, debug_info_p, gnat_entity);
1368 /* Don't notify the field as "addressable", since we won't be taking
1369 it's address and it would prevent create_field_decl from making a
1371 gnu_field = create_field_decl (get_identifier ("OBJECT"),
1372 gnu_field_type, gnu_type, 1, 0, 0, 0);
1374 finish_record_type (gnu_type, gnu_field, false, false);
1375 TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
1376 SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize));
1381 case E_Floating_Point_Type:
1382 /* If this is a VAX floating-point type, use an integer of the proper
1383 size. All the operations will be handled with ASM statements. */
1384 if (Vax_Float (gnat_entity))
1386 gnu_type = make_signed_type (esize);
1387 TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1;
1388 SET_TYPE_DIGITS_VALUE (gnu_type,
1389 UI_To_gnu (Digits_Value (gnat_entity),
1394 /* The type of the Low and High bounds can be our type if this is
1395 a type from Standard, so set them at the end of the function. */
1396 gnu_type = make_node (REAL_TYPE);
1397 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1398 layout_type (gnu_type);
1401 case E_Floating_Point_Subtype:
1402 if (Vax_Float (gnat_entity))
1404 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1410 && Present (Ancestor_Subtype (gnat_entity))
1411 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity))
1412 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity))
1413 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity))))
1414 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity),
1415 gnu_expr, definition);
1417 gnu_type = make_node (REAL_TYPE);
1418 TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity));
1419 TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize);
1421 TYPE_MIN_VALUE (gnu_type)
1422 = convert (TREE_TYPE (gnu_type),
1423 elaborate_expression (Type_Low_Bound (gnat_entity),
1424 gnat_entity, get_identifier ("L"),
1426 Needs_Debug_Info (gnat_entity)));
1428 TYPE_MAX_VALUE (gnu_type)
1429 = convert (TREE_TYPE (gnu_type),
1430 elaborate_expression (Type_High_Bound (gnat_entity),
1431 gnat_entity, get_identifier ("U"),
1433 Needs_Debug_Info (gnat_entity)));
1435 /* One of the above calls might have caused us to be elaborated,
1436 so don't blow up if so. */
1437 if (present_gnu_tree (gnat_entity))
1439 maybe_present = true;
1443 layout_type (gnu_type);
1447 /* Array and String Types and Subtypes
1449 Unconstrained array types are represented by E_Array_Type and
1450 constrained array types are represented by E_Array_Subtype. There
1451 are no actual objects of an unconstrained array type; all we have
1452 are pointers to that type.
1454 The following fields are defined on array types and subtypes:
1456 Component_Type Component type of the array.
1457 Number_Dimensions Number of dimensions (an int).
1458 First_Index Type of first index. */
1463 tree gnu_template_fields = NULL_TREE;
1464 tree gnu_template_type = make_node (RECORD_TYPE);
1465 tree gnu_ptr_template = build_pointer_type (gnu_template_type);
1466 tree gnu_fat_type = make_node (RECORD_TYPE);
1467 int ndim = Number_Dimensions (gnat_entity);
1469 = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0;
1471 = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1;
1472 tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *));
1473 tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *));
1474 tree gnu_comp_size = 0;
1475 tree gnu_max_size = size_one_node;
1476 tree gnu_max_size_unit;
1478 Entity_Id gnat_ind_subtype;
1479 Entity_Id gnat_ind_base_subtype;
1480 tree gnu_template_reference;
1483 TYPE_NAME (gnu_template_type)
1484 = create_concat_name (gnat_entity, "XUB");
1485 TYPE_NAME (gnu_fat_type) = create_concat_name (gnat_entity, "XUP");
1486 TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1;
1487 TYPE_READONLY (gnu_template_type) = 1;
1489 /* Make a node for the array. If we are not defining the array
1490 suppress expanding incomplete types and save the node as the type
1492 gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE);
1495 defer_incomplete_level++;
1496 this_deferred = this_made_decl = true;
1497 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
1498 !Comes_From_Source (gnat_entity),
1499 debug_info_p, gnat_entity);
1500 save_gnu_tree (gnat_entity, gnu_decl, false);
1504 /* Build the fat pointer type. Use a "void *" object instead of
1505 a pointer to the array type since we don't have the array type
1506 yet (it will reference the fat pointer via the bounds). */
1507 tem = chainon (chainon (NULL_TREE,
1508 create_field_decl (get_identifier ("P_ARRAY"),
1510 gnu_fat_type, 0, 0, 0, 0)),
1511 create_field_decl (get_identifier ("P_BOUNDS"),
1513 gnu_fat_type, 0, 0, 0, 0));
1515 /* Make sure we can put this into a register. */
1516 TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
1517 finish_record_type (gnu_fat_type, tem, false, true);
1519 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1520 is the fat pointer. This will be used to access the individual
1521 fields once we build them. */
1522 tem = build3 (COMPONENT_REF, gnu_ptr_template,
1523 build0 (PLACEHOLDER_EXPR, gnu_fat_type),
1524 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE);
1525 gnu_template_reference
1526 = build_unary_op (INDIRECT_REF, gnu_template_type, tem);
1527 TREE_READONLY (gnu_template_reference) = 1;
1529 /* Now create the GCC type for each index and add the fields for
1530 that index to the template. */
1531 for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity),
1532 gnat_ind_base_subtype
1533 = First_Index (Implementation_Base_Type (gnat_entity));
1534 index < ndim && index >= 0;
1536 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1537 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1539 char field_name[10];
1540 tree gnu_ind_subtype
1541 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype)));
1542 tree gnu_base_subtype
1543 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1545 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1547 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1548 tree gnu_min_field, gnu_max_field, gnu_min, gnu_max;
1550 /* Make the FIELD_DECLs for the minimum and maximum of this
1551 type and then make extractions of that field from the
1553 sprintf (field_name, "LB%d", index);
1554 gnu_min_field = create_field_decl (get_identifier (field_name),
1556 gnu_template_type, 0, 0, 0, 0);
1557 field_name[0] = 'U';
1558 gnu_max_field = create_field_decl (get_identifier (field_name),
1560 gnu_template_type, 0, 0, 0, 0);
1562 Sloc_to_locus (Sloc (gnat_entity),
1563 &DECL_SOURCE_LOCATION (gnu_min_field));
1564 Sloc_to_locus (Sloc (gnat_entity),
1565 &DECL_SOURCE_LOCATION (gnu_max_field));
1566 gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field);
1568 /* We can't use build_component_ref here since the template
1569 type isn't complete yet. */
1570 gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype,
1571 gnu_template_reference, gnu_min_field,
1573 gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype,
1574 gnu_template_reference, gnu_max_field,
1576 TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1;
1578 /* Make a range type with the new ranges, but using
1579 the Ada subtype. Then we convert to sizetype. */
1580 gnu_index_types[index]
1581 = create_index_type (convert (sizetype, gnu_min),
1582 convert (sizetype, gnu_max),
1583 build_range_type (gnu_ind_subtype,
1585 /* Update the maximum size of the array, in elements. */
1587 = size_binop (MULT_EXPR, gnu_max_size,
1588 size_binop (PLUS_EXPR, size_one_node,
1589 size_binop (MINUS_EXPR, gnu_base_max,
1592 TYPE_NAME (gnu_index_types[index])
1593 = create_concat_name (gnat_entity, field_name);
1596 for (index = 0; index < ndim; index++)
1598 = chainon (gnu_template_fields, gnu_temp_fields[index]);
1600 /* Install all the fields into the template. */
1601 finish_record_type (gnu_template_type, gnu_template_fields,
1603 TYPE_READONLY (gnu_template_type) = 1;
1605 /* Now make the array of arrays and update the pointer to the array
1606 in the fat pointer. Note that it is the first field. */
1608 tem = gnat_to_gnu_type (Component_Type (gnat_entity));
1610 /* Get and validate any specified Component_Size, but if Packed,
1611 ignore it since the front end will have taken care of it. */
1613 = validate_size (Component_Size (gnat_entity), tem,
1615 (Is_Bit_Packed_Array (gnat_entity)
1616 ? TYPE_DECL : VAR_DECL),
1617 true, Has_Component_Size_Clause (gnat_entity));
1619 if (Has_Atomic_Components (gnat_entity))
1620 check_ok_for_atomic (tem, gnat_entity, true);
1622 /* If the component type is a RECORD_TYPE that has a self-referential
1623 size, use the maxium size. */
1624 if (!gnu_comp_size && TREE_CODE (tem) == RECORD_TYPE
1625 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem)))
1626 gnu_comp_size = max_size (TYPE_SIZE (tem), true);
1628 if (!Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size)
1630 tem = make_type_from_size (tem, gnu_comp_size, false);
1631 tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity,
1632 "C_PAD", false, definition, true);
1635 if (Has_Volatile_Components (gnat_entity))
1636 tem = build_qualified_type (tem,
1637 TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE);
1639 /* If Component_Size is not already specified, annotate it with the
1640 size of the component. */
1641 if (Unknown_Component_Size (gnat_entity))
1642 Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem)));
1644 gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node,
1645 size_binop (MULT_EXPR, gnu_max_size,
1646 TYPE_SIZE_UNIT (tem)));
1647 gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node,
1648 size_binop (MULT_EXPR,
1649 convert (bitsizetype,
1653 for (index = ndim - 1; index >= 0; index--)
1655 tem = build_array_type (tem, gnu_index_types[index]);
1656 TYPE_MULTI_ARRAY_P (tem) = (index > 0);
1658 /* If the type below this an multi-array type, then this
1659 does not not have aliased components.
1661 ??? Otherwise, for now, we say that any component of aggregate
1662 type is addressable because the front end may take 'Reference
1663 of it. But we have to make it addressable if it must be passed
1664 by reference or it that is the default. */
1665 TYPE_NONALIASED_COMPONENT (tem)
1666 = ((TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
1667 && TYPE_MULTI_ARRAY_P (TREE_TYPE (tem))) ? 1
1668 : (!Has_Aliased_Components (gnat_entity)
1669 && !AGGREGATE_TYPE_P (TREE_TYPE (tem))));
1672 /* If an alignment is specified, use it if valid. But ignore it for
1673 types that represent the unpacked base type for packed arrays. */
1674 if (No (Packed_Array_Type (gnat_entity))
1675 && Known_Alignment (gnat_entity))
1677 gcc_assert (Present (Alignment (gnat_entity)));
1679 = validate_alignment (Alignment (gnat_entity), gnat_entity,
1683 TYPE_CONVENTION_FORTRAN_P (tem)
1684 = (Convention (gnat_entity) == Convention_Fortran);
1685 TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem);
1687 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
1688 corresponding fat pointer. */
1689 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type)
1690 = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type;
1691 TYPE_MODE (gnu_type) = BLKmode;
1692 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem);
1693 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type);
1695 /* If the maximum size doesn't overflow, use it. */
1696 if (TREE_CODE (gnu_max_size) == INTEGER_CST
1697 && !TREE_OVERFLOW (gnu_max_size))
1699 = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem));
1700 if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST
1701 && !TREE_OVERFLOW (gnu_max_size_unit))
1702 TYPE_SIZE_UNIT (tem)
1703 = size_binop (MIN_EXPR, gnu_max_size_unit,
1704 TYPE_SIZE_UNIT (tem));
1706 create_type_decl (create_concat_name (gnat_entity, "XUA"),
1707 tem, NULL, !Comes_From_Source (gnat_entity),
1708 debug_info_p, gnat_entity);
1710 /* Create a record type for the object and its template and
1711 set the template at a negative offset. */
1712 tem = build_unc_object_type (gnu_template_type, tem,
1713 create_concat_name (gnat_entity, "XUT"));
1714 DECL_FIELD_OFFSET (TYPE_FIELDS (tem))
1715 = size_binop (MINUS_EXPR, size_zero_node,
1716 byte_position (TREE_CHAIN (TYPE_FIELDS (tem))));
1717 DECL_FIELD_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem))) = size_zero_node;
1718 DECL_FIELD_BIT_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem)))
1719 = bitsize_zero_node;
1720 SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type);
1721 TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem;
1723 /* Give the thin pointer type a name. */
1724 create_type_decl (create_concat_name (gnat_entity, "XUX"),
1725 build_pointer_type (tem), NULL,
1726 !Comes_From_Source (gnat_entity), debug_info_p,
1731 case E_String_Subtype:
1732 case E_Array_Subtype:
1734 /* This is the actual data type for array variables. Multidimensional
1735 arrays are implemented in the gnu tree as arrays of arrays. Note
1736 that for the moment arrays which have sparse enumeration subtypes as
1737 index components create sparse arrays, which is obviously space
1738 inefficient but so much easier to code for now.
1740 Also note that the subtype never refers to the unconstrained
1741 array type, which is somewhat at variance with Ada semantics.
1743 First check to see if this is simply a renaming of the array
1744 type. If so, the result is the array type. */
1746 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
1747 if (!Is_Constrained (gnat_entity))
1752 int array_dim = Number_Dimensions (gnat_entity);
1754 = ((Convention (gnat_entity) == Convention_Fortran)
1755 ? array_dim - 1 : 0);
1757 = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1;
1758 Entity_Id gnat_ind_subtype;
1759 Entity_Id gnat_ind_base_subtype;
1760 tree gnu_base_type = gnu_type;
1761 tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *));
1762 tree gnu_comp_size = NULL_TREE;
1763 tree gnu_max_size = size_one_node;
1764 tree gnu_max_size_unit;
1765 bool need_index_type_struct = false;
1766 bool max_overflow = false;
1768 /* First create the gnu types for each index. Create types for
1769 debugging information to point to the index types if the
1770 are not integer types, have variable bounds, or are
1771 wider than sizetype. */
1773 for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity),
1774 gnat_ind_base_subtype
1775 = First_Index (Implementation_Base_Type (gnat_entity));
1776 index < array_dim && index >= 0;
1778 gnat_ind_subtype = Next_Index (gnat_ind_subtype),
1779 gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype))
1781 tree gnu_index_subtype
1782 = get_unpadded_type (Etype (gnat_ind_subtype));
1784 = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype));
1786 = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype));
1787 tree gnu_base_subtype
1788 = get_unpadded_type (Etype (gnat_ind_base_subtype));
1790 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype));
1792 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype));
1793 tree gnu_base_type = get_base_type (gnu_base_subtype);
1794 tree gnu_base_base_min
1795 = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type));
1796 tree gnu_base_base_max
1797 = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type));
1801 /* If the minimum and maximum values both overflow in
1802 SIZETYPE, but the difference in the original type
1803 does not overflow in SIZETYPE, ignore the overflow
1805 if ((TYPE_PRECISION (gnu_index_subtype)
1806 > TYPE_PRECISION (sizetype)
1807 || TYPE_UNSIGNED (gnu_index_subtype)
1808 != TYPE_UNSIGNED (sizetype))
1809 && TREE_CODE (gnu_min) == INTEGER_CST
1810 && TREE_CODE (gnu_max) == INTEGER_CST
1811 && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max)
1813 (fold (build2 (MINUS_EXPR, gnu_index_subtype,
1814 TYPE_MAX_VALUE (gnu_index_subtype),
1815 TYPE_MIN_VALUE (gnu_index_subtype))))))
1816 TREE_OVERFLOW (gnu_min) = TREE_OVERFLOW (gnu_max)
1817 = TREE_CONSTANT_OVERFLOW (gnu_min)
1818 = TREE_CONSTANT_OVERFLOW (gnu_max) = 0;
1820 /* Similarly, if the range is null, use bounds of 1..0 for
1821 the sizetype bounds. */
1822 else if ((TYPE_PRECISION (gnu_index_subtype)
1823 > TYPE_PRECISION (sizetype)
1824 || TYPE_UNSIGNED (gnu_index_subtype)
1825 != TYPE_UNSIGNED (sizetype))
1826 && TREE_CODE (gnu_min) == INTEGER_CST
1827 && TREE_CODE (gnu_max) == INTEGER_CST
1828 && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max))
1829 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype),
1830 TYPE_MIN_VALUE (gnu_index_subtype)))
1831 gnu_min = size_one_node, gnu_max = size_zero_node;
1833 /* Now compute the size of this bound. We need to provide
1834 GCC with an upper bound to use but have to deal with the
1835 "superflat" case. There are three ways to do this. If we
1836 can prove that the array can never be superflat, we can
1837 just use the high bound of the index subtype. If we can
1838 prove that the low bound minus one can't overflow, we
1839 can do this as MAX (hb, lb - 1). Otherwise, we have to use
1840 the expression hb >= lb ? hb : lb - 1. */
1841 gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node);
1843 /* See if the base array type is already flat. If it is, we
1844 are probably compiling an ACVC test, but it will cause the
1845 code below to malfunction if we don't handle it specially. */
1846 if (TREE_CODE (gnu_base_min) == INTEGER_CST
1847 && TREE_CODE (gnu_base_max) == INTEGER_CST
1848 && !TREE_CONSTANT_OVERFLOW (gnu_base_min)
1849 && !TREE_CONSTANT_OVERFLOW (gnu_base_max)
1850 && tree_int_cst_lt (gnu_base_max, gnu_base_min))
1851 gnu_high = size_zero_node, gnu_min = size_one_node;
1853 /* If gnu_high is now an integer which overflowed, the array
1854 cannot be superflat. */
1855 else if (TREE_CODE (gnu_high) == INTEGER_CST
1856 && TREE_OVERFLOW (gnu_high))
1858 else if (TYPE_UNSIGNED (gnu_base_subtype)
1859 || TREE_CODE (gnu_high) == INTEGER_CST)
1860 gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high);
1864 (sizetype, build_binary_op (GE_EXPR, integer_type_node,
1868 gnu_index_type[index]
1869 = create_index_type (gnu_min, gnu_high, gnu_index_subtype);
1871 /* Also compute the maximum size of the array. Here we
1872 see if any constraint on the index type of the base type
1873 can be used in the case of self-referential bound on
1874 the index type of the subtype. We look for a non-"infinite"
1875 and non-self-referential bound from any type involved and
1876 handle each bound separately. */
1878 if ((TREE_CODE (gnu_min) == INTEGER_CST
1879 && !TREE_OVERFLOW (gnu_min)
1880 && !operand_equal_p (gnu_min, gnu_base_base_min, 0))
1881 || !CONTAINS_PLACEHOLDER_P (gnu_min))
1882 gnu_base_min = gnu_min;
1884 if ((TREE_CODE (gnu_max) == INTEGER_CST
1885 && !TREE_OVERFLOW (gnu_max)
1886 && !operand_equal_p (gnu_max, gnu_base_base_max, 0))
1887 || !CONTAINS_PLACEHOLDER_P (gnu_max))
1888 gnu_base_max = gnu_max;
1890 if ((TREE_CODE (gnu_base_min) == INTEGER_CST
1891 && TREE_CONSTANT_OVERFLOW (gnu_base_min))
1892 || operand_equal_p (gnu_base_min, gnu_base_base_min, 0)
1893 || (TREE_CODE (gnu_base_max) == INTEGER_CST
1894 && TREE_CONSTANT_OVERFLOW (gnu_base_max))
1895 || operand_equal_p (gnu_base_max, gnu_base_base_max, 0))
1896 max_overflow = true;
1898 gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min);
1899 gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max);
1902 = size_binop (MAX_EXPR,
1903 size_binop (PLUS_EXPR, size_one_node,
1904 size_binop (MINUS_EXPR, gnu_base_max,
1908 if (TREE_CODE (gnu_this_max) == INTEGER_CST
1909 && TREE_CONSTANT_OVERFLOW (gnu_this_max))
1910 max_overflow = true;
1913 = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max);
1915 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype))
1916 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype))
1918 || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE
1919 || (TREE_TYPE (gnu_index_subtype)
1920 && (TREE_CODE (TREE_TYPE (gnu_index_subtype))
1922 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype)
1923 || (TYPE_PRECISION (gnu_index_subtype)
1924 > TYPE_PRECISION (sizetype)))
1925 need_index_type_struct = true;
1928 /* Then flatten: create the array of arrays. */
1930 gnu_type = gnat_to_gnu_type (Component_Type (gnat_entity));
1932 /* One of the above calls might have caused us to be elaborated,
1933 so don't blow up if so. */
1934 if (present_gnu_tree (gnat_entity))
1936 maybe_present = true;
1940 /* Get and validate any specified Component_Size, but if Packed,
1941 ignore it since the front end will have taken care of it. */
1943 = validate_size (Component_Size (gnat_entity), gnu_type,
1945 (Is_Bit_Packed_Array (gnat_entity)
1946 ? TYPE_DECL : VAR_DECL),
1947 true, Has_Component_Size_Clause (gnat_entity));
1949 /* If the component type is a RECORD_TYPE that has a self-referential
1950 size, use the maxium size. */
1951 if (!gnu_comp_size && TREE_CODE (gnu_type) == RECORD_TYPE
1952 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
1953 gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true);
1955 if (!Is_Bit_Packed_Array (gnat_entity) && gnu_comp_size)
1957 gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false);
1958 gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0,
1959 gnat_entity, "C_PAD", false,
1963 if (Has_Volatile_Components (Base_Type (gnat_entity)))
1964 gnu_type = build_qualified_type (gnu_type,
1965 (TYPE_QUALS (gnu_type)
1966 | TYPE_QUAL_VOLATILE));
1968 gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size,
1969 TYPE_SIZE_UNIT (gnu_type));
1970 gnu_max_size = size_binop (MULT_EXPR,
1971 convert (bitsizetype, gnu_max_size),
1972 TYPE_SIZE (gnu_type));
1974 for (index = array_dim - 1; index >= 0; index --)
1976 gnu_type = build_array_type (gnu_type, gnu_index_type[index]);
1977 TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0);
1978 /* If the type below this an multi-array type, then this
1979 does not not have aliased components.
1981 ??? Otherwise, for now, we say that any component of aggregate
1982 type is addressable because the front end may take 'Reference
1983 of it. But we have to make it addressable if it must be passed
1984 by reference or it that is the default. */
1985 TYPE_NONALIASED_COMPONENT (gnu_type)
1986 = ((TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
1987 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) ? 1
1988 : (!Has_Aliased_Components (gnat_entity)
1989 && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_type))));
1992 /* If we are at file level and this is a multi-dimensional array, we
1993 need to make a variable corresponding to the stride of the
1994 inner dimensions. */
1995 if (global_bindings_p () && array_dim > 1)
1997 tree gnu_str_name = get_identifier ("ST");
2000 for (gnu_arr_type = TREE_TYPE (gnu_type);
2001 TREE_CODE (gnu_arr_type) == ARRAY_TYPE;
2002 gnu_arr_type = TREE_TYPE (gnu_arr_type),
2003 gnu_str_name = concat_id_with_name (gnu_str_name, "ST"))
2005 tree eltype = TREE_TYPE (gnu_arr_type);
2007 TYPE_SIZE (gnu_arr_type)
2008 = elaborate_expression_1 (gnat_entity, gnat_entity,
2009 TYPE_SIZE (gnu_arr_type),
2010 gnu_str_name, definition, 0);
2012 /* ??? For now, store the size as a multiple of the
2013 alignment of the element type in bytes so that we
2014 can see the alignment from the tree. */
2015 TYPE_SIZE_UNIT (gnu_arr_type)
2017 (MULT_EXPR, sizetype,
2018 elaborate_expression_1
2019 (gnat_entity, gnat_entity,
2020 build_binary_op (EXACT_DIV_EXPR, sizetype,
2021 TYPE_SIZE_UNIT (gnu_arr_type),
2022 size_int (TYPE_ALIGN (eltype)
2024 concat_id_with_name (gnu_str_name, "A_U"),
2026 size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT));
2030 /* If we need to write out a record type giving the names of
2031 the bounds, do it now. */
2032 if (need_index_type_struct && debug_info_p)
2034 tree gnu_bound_rec_type = make_node (RECORD_TYPE);
2035 tree gnu_field_list = NULL_TREE;
2038 TYPE_NAME (gnu_bound_rec_type)
2039 = create_concat_name (gnat_entity, "XA");
2041 for (index = array_dim - 1; index >= 0; index--)
2044 = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type[index]));
2046 if (TREE_CODE (gnu_type_name) == TYPE_DECL)
2047 gnu_type_name = DECL_NAME (gnu_type_name);
2049 gnu_field = create_field_decl (gnu_type_name,
2052 0, NULL_TREE, NULL_TREE, 0);
2053 TREE_CHAIN (gnu_field) = gnu_field_list;
2054 gnu_field_list = gnu_field;
2057 finish_record_type (gnu_bound_rec_type, gnu_field_list,
2061 TYPE_CONVENTION_FORTRAN_P (gnu_type)
2062 = (Convention (gnat_entity) == Convention_Fortran);
2063 TYPE_PACKED_ARRAY_TYPE_P (gnu_type)
2064 = Is_Packed_Array_Type (gnat_entity);
2066 /* If our size depends on a placeholder and the maximum size doesn't
2067 overflow, use it. */
2068 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))
2069 && !(TREE_CODE (gnu_max_size) == INTEGER_CST
2070 && TREE_OVERFLOW (gnu_max_size))
2071 && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST
2072 && TREE_OVERFLOW (gnu_max_size_unit))
2075 TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size,
2076 TYPE_SIZE (gnu_type));
2077 TYPE_SIZE_UNIT (gnu_type)
2078 = size_binop (MIN_EXPR, gnu_max_size_unit,
2079 TYPE_SIZE_UNIT (gnu_type));
2082 /* Set our alias set to that of our base type. This gives all
2083 array subtypes the same alias set. */
2084 copy_alias_set (gnu_type, gnu_base_type);
2087 /* If this is a packed type, make this type the same as the packed
2088 array type, but do some adjusting in the type first. */
2090 if (Present (Packed_Array_Type (gnat_entity)))
2092 Entity_Id gnat_index;
2093 tree gnu_inner_type;
2095 /* First finish the type we had been making so that we output
2096 debugging information for it */
2098 = build_qualified_type (gnu_type,
2099 (TYPE_QUALS (gnu_type)
2100 | (TYPE_QUAL_VOLATILE
2101 * Treat_As_Volatile (gnat_entity))));
2102 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2103 !Comes_From_Source (gnat_entity),
2104 debug_info_p, gnat_entity);
2105 if (!Comes_From_Source (gnat_entity))
2106 DECL_ARTIFICIAL (gnu_decl) = 1;
2108 /* Save it as our equivalent in case the call below elaborates
2110 save_gnu_tree (gnat_entity, gnu_decl, false);
2112 gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity),
2114 this_made_decl = true;
2115 gnu_inner_type = gnu_type = TREE_TYPE (gnu_decl);
2116 save_gnu_tree (gnat_entity, NULL_TREE, false);
2118 while (TREE_CODE (gnu_inner_type) == RECORD_TYPE
2119 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type)
2120 || TYPE_IS_PADDING_P (gnu_inner_type)))
2121 gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type));
2123 /* We need to point the type we just made to our index type so
2124 the actual bounds can be put into a template. */
2126 if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE
2127 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type))
2128 || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE
2129 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type)))
2131 if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE)
2133 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2134 If it is, we need to make another type. */
2135 if (TYPE_MODULAR_P (gnu_inner_type))
2139 gnu_subtype = make_node (INTEGER_TYPE);
2141 TREE_TYPE (gnu_subtype) = gnu_inner_type;
2142 TYPE_MIN_VALUE (gnu_subtype)
2143 = TYPE_MIN_VALUE (gnu_inner_type);
2144 TYPE_MAX_VALUE (gnu_subtype)
2145 = TYPE_MAX_VALUE (gnu_inner_type);
2146 TYPE_PRECISION (gnu_subtype)
2147 = TYPE_PRECISION (gnu_inner_type);
2148 TYPE_UNSIGNED (gnu_subtype)
2149 = TYPE_UNSIGNED (gnu_inner_type);
2150 TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1;
2151 layout_type (gnu_subtype);
2153 gnu_inner_type = gnu_subtype;
2156 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1;
2159 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE);
2161 for (gnat_index = First_Index (gnat_entity);
2162 Present (gnat_index); gnat_index = Next_Index (gnat_index))
2163 SET_TYPE_ACTUAL_BOUNDS
2165 tree_cons (NULL_TREE,
2166 get_unpadded_type (Etype (gnat_index)),
2167 TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2169 if (Convention (gnat_entity) != Convention_Fortran)
2170 SET_TYPE_ACTUAL_BOUNDS
2172 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type)));
2174 if (TREE_CODE (gnu_type) == RECORD_TYPE
2175 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2176 TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type;
2180 /* Abort if packed array with no packed array type field set. */
2182 gcc_assert (!Is_Packed (gnat_entity));
2186 case E_String_Literal_Subtype:
2187 /* Create the type for a string literal. */
2189 Entity_Id gnat_full_type
2190 = (IN (Ekind (Etype (gnat_entity)), Private_Kind)
2191 && Present (Full_View (Etype (gnat_entity)))
2192 ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity));
2193 tree gnu_string_type = get_unpadded_type (gnat_full_type);
2194 tree gnu_string_array_type
2195 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type))));
2196 tree gnu_string_index_type
2197 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2198 (TYPE_DOMAIN (gnu_string_array_type))));
2199 tree gnu_lower_bound
2200 = convert (gnu_string_index_type,
2201 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity)));
2202 int length = UI_To_Int (String_Literal_Length (gnat_entity));
2203 tree gnu_length = ssize_int (length - 1);
2204 tree gnu_upper_bound
2205 = build_binary_op (PLUS_EXPR, gnu_string_index_type,
2207 convert (gnu_string_index_type, gnu_length));
2209 = build_range_type (gnu_string_index_type,
2210 gnu_lower_bound, gnu_upper_bound);
2212 = create_index_type (convert (sizetype,
2213 TYPE_MIN_VALUE (gnu_range_type)),
2215 TYPE_MAX_VALUE (gnu_range_type)),
2219 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)),
2221 copy_alias_set (gnu_type, gnu_string_type);
2225 /* Record Types and Subtypes
2227 The following fields are defined on record types:
2229 Has_Discriminants True if the record has discriminants
2230 First_Discriminant Points to head of list of discriminants
2231 First_Entity Points to head of list of fields
2232 Is_Tagged_Type True if the record is tagged
2234 Implementation of Ada records and discriminated records:
2236 A record type definition is transformed into the equivalent of a C
2237 struct definition. The fields that are the discriminants which are
2238 found in the Full_Type_Declaration node and the elements of the
2239 Component_List found in the Record_Type_Definition node. The
2240 Component_List can be a recursive structure since each Variant of
2241 the Variant_Part of the Component_List has a Component_List.
2243 Processing of a record type definition comprises starting the list of
2244 field declarations here from the discriminants and the calling the
2245 function components_to_record to add the rest of the fields from the
2246 component list and return the gnu type node. The function
2247 components_to_record will call itself recursively as it traverses
2251 if (Has_Complex_Representation (gnat_entity))
2254 = build_complex_type
2256 (Etype (Defining_Entity
2257 (First (Component_Items
2260 (Declaration_Node (gnat_entity)))))))));
2266 Node_Id full_definition = Declaration_Node (gnat_entity);
2267 Node_Id record_definition = Type_Definition (full_definition);
2268 Entity_Id gnat_field;
2270 tree gnu_field_list = NULL_TREE;
2271 tree gnu_get_parent;
2272 int packed = (Is_Packed (gnat_entity) ? 1
2273 : (Component_Alignment (gnat_entity)
2274 == Calign_Storage_Unit) ? -1
2276 bool has_rep = Has_Specified_Layout (gnat_entity);
2277 bool all_rep = has_rep;
2279 = (Is_Tagged_Type (gnat_entity)
2280 && Nkind (record_definition) == N_Derived_Type_Definition);
2282 /* See if all fields have a rep clause. Stop when we find one
2284 for (gnat_field = First_Entity (gnat_entity);
2285 Present (gnat_field) && all_rep;
2286 gnat_field = Next_Entity (gnat_field))
2287 if ((Ekind (gnat_field) == E_Component
2288 || Ekind (gnat_field) == E_Discriminant)
2289 && No (Component_Clause (gnat_field)))
2292 /* If this is a record extension, go a level further to find the
2293 record definition. Also, verify we have a Parent_Subtype. */
2296 if (!type_annotate_only
2297 || Present (Record_Extension_Part (record_definition)))
2298 record_definition = Record_Extension_Part (record_definition);
2300 gcc_assert (type_annotate_only
2301 || Present (Parent_Subtype (gnat_entity)));
2304 /* Make a node for the record. If we are not defining the record,
2305 suppress expanding incomplete types and save the node as the type
2306 for GNAT_ENTITY. We use the same RECORD_TYPE as for a dummy type
2307 and reset TYPE_DUMMY_P to show it's no longer a dummy.
2309 It is very tempting to delay resetting this bit until we are done
2310 with completing the type, e.g. to let possible intermediate
2311 elaboration of access types designating the record know it is not
2312 complete and arrange for update_pointer_to to fix things up later.
2314 It would be wrong, however, because dummy types are expected only
2315 to be created for Ada incomplete or private types, which is not
2316 what we have here. Doing so would make other parts of gigi think
2317 we are dealing with a really incomplete or private type, and have
2318 nasty side effects, typically on the generation of the associated
2319 debugging information. */
2320 gnu_type = make_dummy_type (gnat_entity);
2321 TYPE_DUMMY_P (gnu_type) = 0;
2323 if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL && debug_info_p)
2324 DECL_IGNORED_P (TYPE_NAME (gnu_type)) = 0;
2326 TYPE_ALIGN (gnu_type) = 0;
2327 TYPE_PACKED (gnu_type) = packed || has_rep;
2331 defer_incomplete_level++;
2332 this_deferred = true;
2333 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2334 !Comes_From_Source (gnat_entity),
2335 debug_info_p, gnat_entity);
2336 save_gnu_tree (gnat_entity, gnu_decl, false);
2337 this_made_decl = saved = true;
2340 /* If both a size and rep clause was specified, put the size in
2341 the record type now so that it can get the proper mode. */
2342 if (has_rep && Known_Esize (gnat_entity))
2343 TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype);
2345 /* Always set the alignment here so that it can be used to
2346 set the mode, if it is making the alignment stricter. If
2347 it is invalid, it will be checked again below. If this is to
2348 be Atomic, choose a default alignment of a word unless we know
2349 the size and it's smaller. */
2350 if (Known_Alignment (gnat_entity))
2351 TYPE_ALIGN (gnu_type)
2352 = validate_alignment (Alignment (gnat_entity), gnat_entity, 0);
2353 else if (Is_Atomic (gnat_entity))
2354 TYPE_ALIGN (gnu_type)
2355 = (esize >= BITS_PER_WORD ? BITS_PER_WORD
2356 : 1 << (floor_log2 (esize - 1) + 1));
2358 /* If we have a Parent_Subtype, make a field for the parent. If
2359 this record has rep clauses, force the position to zero. */
2360 if (Present (Parent_Subtype (gnat_entity)))
2364 /* A major complexity here is that the parent subtype will
2365 reference our discriminants. But those must reference
2366 the parent component of this record. So here we will
2367 initialize each of those components to a COMPONENT_REF.
2368 The first operand of that COMPONENT_REF is another
2369 COMPONENT_REF which will be filled in below, once
2370 the parent type can be safely built. */
2372 gnu_get_parent = build3 (COMPONENT_REF, void_type_node,
2373 build0 (PLACEHOLDER_EXPR, gnu_type),
2374 build_decl (FIELD_DECL, NULL_TREE,
2378 if (Has_Discriminants (gnat_entity))
2379 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2380 Present (gnat_field);
2381 gnat_field = Next_Stored_Discriminant (gnat_field))
2382 if (Present (Corresponding_Discriminant (gnat_field)))
2385 build3 (COMPONENT_REF,
2386 get_unpadded_type (Etype (gnat_field)),
2388 gnat_to_gnu_field_decl (Corresponding_Discriminant
2393 gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_entity));
2396 = create_field_decl (get_identifier
2397 (Get_Name_String (Name_uParent)),
2398 gnu_parent, gnu_type, 0,
2399 has_rep ? TYPE_SIZE (gnu_parent) : 0,
2400 has_rep ? bitsize_zero_node : 0, 1);
2401 DECL_INTERNAL_P (gnu_field_list) = 1;
2403 TREE_TYPE (gnu_get_parent) = gnu_parent;
2404 TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list;
2407 /* Add the fields for the discriminants into the record. */
2408 if (!Is_Unchecked_Union (gnat_entity)
2409 && Has_Discriminants (gnat_entity))
2410 for (gnat_field = First_Stored_Discriminant (gnat_entity);
2411 Present (gnat_field);
2412 gnat_field = Next_Stored_Discriminant (gnat_field))
2414 /* If this is a record extension and this discriminant
2415 is the renaming of another discriminant, we've already
2416 handled the discriminant above. */
2417 if (Present (Parent_Subtype (gnat_entity))
2418 && Present (Corresponding_Discriminant (gnat_field)))
2422 = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition);
2424 /* Make an expression using a PLACEHOLDER_EXPR from the
2425 FIELD_DECL node just created and link that with the
2426 corresponding GNAT defining identifier. Then add to the
2428 save_gnu_tree (gnat_field,
2429 build3 (COMPONENT_REF, TREE_TYPE (gnu_field),
2430 build0 (PLACEHOLDER_EXPR,
2431 DECL_CONTEXT (gnu_field)),
2432 gnu_field, NULL_TREE),
2435 TREE_CHAIN (gnu_field) = gnu_field_list;
2436 gnu_field_list = gnu_field;
2439 /* Put the discriminants into the record (backwards), so we can
2440 know the appropriate discriminant to use for the names of the
2442 TYPE_FIELDS (gnu_type) = gnu_field_list;
2444 /* Add the listed fields into the record and finish up. */
2445 components_to_record (gnu_type, Component_List (record_definition),
2446 gnu_field_list, packed, definition, NULL,
2447 false, all_rep, this_deferred);
2451 debug_deferred = true;
2452 defer_debug_level++;
2454 defer_debug_incomplete_list
2455 = tree_cons (NULL_TREE, gnu_type,
2456 defer_debug_incomplete_list);
2459 /* We used to remove the associations of the discriminants and
2460 _Parent for validity checking, but we may need them if there's
2461 Freeze_Node for a subtype used in this record. */
2463 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2464 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity);
2466 /* If it is a tagged record force the type to BLKmode to insure
2467 that these objects will always be placed in memory. Do the
2468 same thing for limited record types. */
2469 if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
2470 TYPE_MODE (gnu_type) = BLKmode;
2472 /* If this is a derived type, we must make the alias set of this type
2473 the same as that of the type we are derived from. We assume here
2474 that the other type is already frozen. */
2475 if (Etype (gnat_entity) != gnat_entity
2476 && !(Is_Private_Type (Etype (gnat_entity))
2477 && Full_View (Etype (gnat_entity)) == gnat_entity))
2478 copy_alias_set (gnu_type, gnat_to_gnu_type (Etype (gnat_entity)));
2480 /* Fill in locations of fields. */
2481 annotate_rep (gnat_entity, gnu_type);
2483 /* If there are any entities in the chain corresponding to
2484 components that we did not elaborate, ensure we elaborate their
2485 types if they are Itypes. */
2486 for (gnat_temp = First_Entity (gnat_entity);
2487 Present (gnat_temp); gnat_temp = Next_Entity (gnat_temp))
2488 if ((Ekind (gnat_temp) == E_Component
2489 || Ekind (gnat_temp) == E_Discriminant)
2490 && Is_Itype (Etype (gnat_temp))
2491 && !present_gnu_tree (gnat_temp))
2492 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
2496 case E_Class_Wide_Subtype:
2497 /* If an equivalent type is present, that is what we should use.
2498 Otherwise, fall through to handle this like a record subtype
2499 since it may have constraints. */
2501 if (Present (Equivalent_Type (gnat_entity)))
2503 gnu_decl = gnat_to_gnu_entity (Equivalent_Type (gnat_entity),
2505 maybe_present = true;
2509 /* ... fall through ... */
2511 case E_Record_Subtype:
2513 /* If Cloned_Subtype is Present it means this record subtype has
2514 identical layout to that type or subtype and we should use
2515 that GCC type for this one. The front end guarantees that
2516 the component list is shared. */
2517 if (Present (Cloned_Subtype (gnat_entity)))
2519 gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
2521 maybe_present = true;
2524 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2525 changing the type, make a new type with each field having the
2526 type of the field in the new subtype but having the position
2527 computed by transforming every discriminant reference according
2528 to the constraints. We don't see any difference between
2529 private and nonprivate type here since derivations from types should
2530 have been deferred until the completion of the private type. */
2533 Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity);
2538 defer_incomplete_level++, this_deferred = true;
2540 /* Get the base type initially for its alignment and sizes. But
2541 if it is a padded type, we do all the other work with the
2543 gnu_type = gnu_orig_type = gnu_base_type
2544 = gnat_to_gnu_type (gnat_base_type);
2546 if (TREE_CODE (gnu_type) == RECORD_TYPE
2547 && TYPE_IS_PADDING_P (gnu_type))
2548 gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
2550 if (present_gnu_tree (gnat_entity))
2552 maybe_present = true;
2556 /* When the type has discriminants, and these discriminants
2557 affect the shape of what it built, factor them in.
2559 If we are making a subtype of an Unchecked_Union (must be an
2560 Itype), just return the type.
2562 We can't just use Is_Constrained because private subtypes without
2563 discriminants of full types with discriminants with default
2564 expressions are Is_Constrained but aren't constrained! */
2566 if (IN (Ekind (gnat_base_type), Record_Kind)
2567 && !Is_For_Access_Subtype (gnat_entity)
2568 && !Is_Unchecked_Union (gnat_base_type)
2569 && Is_Constrained (gnat_entity)
2570 && Stored_Constraint (gnat_entity) != No_Elist
2571 && Present (Discriminant_Constraint (gnat_entity)))
2573 Entity_Id gnat_field;
2574 tree gnu_field_list = 0;
2576 = compute_field_positions (gnu_orig_type, NULL_TREE,
2577 size_zero_node, bitsize_zero_node,
2580 = substitution_list (gnat_entity, gnat_base_type, NULL_TREE,
2584 gnu_type = make_node (RECORD_TYPE);
2585 TYPE_NAME (gnu_type) = gnu_entity_id;
2586 TYPE_STUB_DECL (gnu_type)
2587 = create_type_decl (NULL_TREE, gnu_type, NULL, false, false,
2589 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2591 for (gnat_field = First_Entity (gnat_entity);
2592 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
2593 if ((Ekind (gnat_field) == E_Component
2594 || Ekind (gnat_field) == E_Discriminant)
2595 && (Underlying_Type (Scope (Original_Record_Component
2598 && (No (Corresponding_Discriminant (gnat_field))
2599 || !Is_Tagged_Type (gnat_base_type)))
2602 = gnat_to_gnu_field_decl (Original_Record_Component
2605 = TREE_VALUE (purpose_member (gnu_old_field,
2607 tree gnu_pos = TREE_PURPOSE (gnu_offset);
2608 tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset));
2610 = gnat_to_gnu_type (Etype (gnat_field));
2611 tree gnu_size = TYPE_SIZE (gnu_field_type);
2612 tree gnu_new_pos = 0;
2613 unsigned int offset_align
2614 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)),
2618 /* If there was a component clause, the field types must be
2619 the same for the type and subtype, so copy the data from
2620 the old field to avoid recomputation here. Also if the
2621 field is justified modular and the optimization in
2622 gnat_to_gnu_field was applied. */
2623 if (Present (Component_Clause
2624 (Original_Record_Component (gnat_field)))
2625 || (TREE_CODE (gnu_field_type) == RECORD_TYPE
2626 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
2627 && TREE_TYPE (TYPE_FIELDS (gnu_field_type))
2628 == TREE_TYPE (gnu_old_field)))
2630 gnu_size = DECL_SIZE (gnu_old_field);
2631 gnu_field_type = TREE_TYPE (gnu_old_field);
2634 /* If this was a bitfield, get the size from the old field.
2635 Also ensure the type can be placed into a bitfield. */
2636 else if (DECL_BIT_FIELD (gnu_old_field))
2638 gnu_size = DECL_SIZE (gnu_old_field);
2639 if (TYPE_MODE (gnu_field_type) == BLKmode
2640 && TREE_CODE (gnu_field_type) == RECORD_TYPE
2641 && host_integerp (TYPE_SIZE (gnu_field_type), 1))
2642 gnu_field_type = make_packable_type (gnu_field_type);
2645 if (CONTAINS_PLACEHOLDER_P (gnu_pos))
2646 for (gnu_temp = gnu_subst_list;
2647 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2648 gnu_pos = substitute_in_expr (gnu_pos,
2649 TREE_PURPOSE (gnu_temp),
2650 TREE_VALUE (gnu_temp));
2652 /* If the size is now a constant, we can set it as the
2653 size of the field when we make it. Otherwise, we need
2654 to deal with it specially. */
2655 if (TREE_CONSTANT (gnu_pos))
2656 gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos);
2660 (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type,
2661 0, gnu_size, gnu_new_pos,
2662 !DECL_NONADDRESSABLE_P (gnu_old_field));
2664 if (!TREE_CONSTANT (gnu_pos))
2666 normalize_offset (&gnu_pos, &gnu_bitpos, offset_align);
2667 DECL_FIELD_OFFSET (gnu_field) = gnu_pos;
2668 DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos;
2669 SET_DECL_OFFSET_ALIGN (gnu_field, offset_align);
2670 DECL_SIZE (gnu_field) = gnu_size;
2671 DECL_SIZE_UNIT (gnu_field)
2672 = convert (sizetype,
2673 size_binop (CEIL_DIV_EXPR, gnu_size,
2674 bitsize_unit_node));
2675 layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field));
2678 DECL_INTERNAL_P (gnu_field)
2679 = DECL_INTERNAL_P (gnu_old_field);
2680 SET_DECL_ORIGINAL_FIELD
2681 (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field)
2682 ? DECL_ORIGINAL_FIELD (gnu_old_field)
2684 DECL_DISCRIMINANT_NUMBER (gnu_field)
2685 = DECL_DISCRIMINANT_NUMBER (gnu_old_field);
2686 TREE_THIS_VOLATILE (gnu_field)
2687 = TREE_THIS_VOLATILE (gnu_old_field);
2688 TREE_CHAIN (gnu_field) = gnu_field_list;
2689 gnu_field_list = gnu_field;
2690 save_gnu_tree (gnat_field, gnu_field, false);
2693 /* Now go through the entities again looking for Itypes that
2694 we have not elaborated but should (e.g., Etypes of fields
2695 that have Original_Components). */
2696 for (gnat_field = First_Entity (gnat_entity);
2697 Present (gnat_field); gnat_field = Next_Entity (gnat_field))
2698 if ((Ekind (gnat_field) == E_Discriminant
2699 || Ekind (gnat_field) == E_Component)
2700 && !present_gnu_tree (Etype (gnat_field)))
2701 gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
2703 finish_record_type (gnu_type, nreverse (gnu_field_list),
2706 /* Now set the size, alignment and alias set of the new type to
2707 match that of the old one, doing any substitutions, as
2709 TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type);
2710 TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type);
2711 TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type);
2712 SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type));
2713 copy_alias_set (gnu_type, gnu_base_type);
2715 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
2716 for (gnu_temp = gnu_subst_list;
2717 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2718 TYPE_SIZE (gnu_type)
2719 = substitute_in_expr (TYPE_SIZE (gnu_type),
2720 TREE_PURPOSE (gnu_temp),
2721 TREE_VALUE (gnu_temp));
2723 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type)))
2724 for (gnu_temp = gnu_subst_list;
2725 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2726 TYPE_SIZE_UNIT (gnu_type)
2727 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type),
2728 TREE_PURPOSE (gnu_temp),
2729 TREE_VALUE (gnu_temp));
2731 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type)))
2732 for (gnu_temp = gnu_subst_list;
2733 gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp))
2735 (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type),
2736 TREE_PURPOSE (gnu_temp),
2737 TREE_VALUE (gnu_temp)));
2739 /* Recompute the mode of this record type now that we know its
2741 compute_record_mode (gnu_type);
2743 /* Fill in locations of fields. */
2744 annotate_rep (gnat_entity, gnu_type);
2747 /* If we've made a new type, record it and make an XVS type to show
2748 what this is a subtype of. Some debuggers require the XVS
2749 type to be output first, so do it in that order. */
2750 if (gnu_type != gnu_orig_type)
2754 tree gnu_subtype_marker = make_node (RECORD_TYPE);
2755 tree gnu_orig_name = TYPE_NAME (gnu_orig_type);
2757 if (TREE_CODE (gnu_orig_name) == TYPE_DECL)
2758 gnu_orig_name = DECL_NAME (gnu_orig_name);
2760 TYPE_NAME (gnu_subtype_marker)
2761 = create_concat_name (gnat_entity, "XVS");
2762 finish_record_type (gnu_subtype_marker,
2763 create_field_decl (gnu_orig_name,
2771 TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity);
2772 TYPE_NAME (gnu_type) = gnu_entity_id;
2773 TYPE_STUB_DECL (gnu_type)
2774 = create_type_decl (TYPE_NAME (gnu_type), gnu_type,
2775 NULL, true, debug_info_p, gnat_entity);
2778 /* Otherwise, go down all the components in the new type and
2779 make them equivalent to those in the base type. */
2781 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
2782 gnat_temp = Next_Entity (gnat_temp))
2783 if ((Ekind (gnat_temp) == E_Discriminant
2784 && !Is_Unchecked_Union (gnat_base_type))
2785 || Ekind (gnat_temp) == E_Component)
2786 save_gnu_tree (gnat_temp,
2787 gnat_to_gnu_field_decl
2788 (Original_Record_Component (gnat_temp)), false);
2792 case E_Access_Subprogram_Type:
2793 case E_Anonymous_Access_Subprogram_Type:
2794 /* If we are not defining this entity, and we have incomplete
2795 entities being processed above us, make a dummy type and
2796 fill it in later. */
2797 if (!definition && defer_incomplete_level != 0)
2799 struct incomplete *p
2800 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
2803 = build_pointer_type
2804 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
2805 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
2806 !Comes_From_Source (gnat_entity),
2807 debug_info_p, gnat_entity);
2808 save_gnu_tree (gnat_entity, gnu_decl, false);
2809 this_made_decl = saved = true;
2811 p->old_type = TREE_TYPE (gnu_type);
2812 p->full_type = Directly_Designated_Type (gnat_entity);
2813 p->next = defer_incomplete_list;
2814 defer_incomplete_list = p;
2818 /* ... fall through ... */
2820 case E_Allocator_Type:
2822 case E_Access_Attribute_Type:
2823 case E_Anonymous_Access_Type:
2824 case E_General_Access_Type:
2826 Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity);
2827 Entity_Id gnat_desig_full
2828 = ((IN (Ekind (Etype (gnat_desig_type)),
2829 Incomplete_Or_Private_Kind))
2830 ? Full_View (gnat_desig_type) : 0);
2831 /* We want to know if we'll be seeing the freeze node for any
2832 incomplete type we may be pointing to. */
2834 = (Present (gnat_desig_full)
2835 ? In_Extended_Main_Code_Unit (gnat_desig_full)
2836 : In_Extended_Main_Code_Unit (gnat_desig_type));
2837 bool got_fat_p = false;
2838 bool made_dummy = false;
2839 tree gnu_desig_type = NULL_TREE;
2840 enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0);
2842 if (!targetm.valid_pointer_mode (p_mode))
2845 if (No (gnat_desig_full)
2846 && (Ekind (gnat_desig_type) == E_Class_Wide_Type
2847 || (Ekind (gnat_desig_type) == E_Class_Wide_Subtype
2848 && Present (Equivalent_Type (gnat_desig_type)))))
2850 if (Present (Equivalent_Type (gnat_desig_type)))
2852 gnat_desig_full = Equivalent_Type (gnat_desig_type);
2853 if (IN (Ekind (gnat_desig_full), Incomplete_Or_Private_Kind))
2854 gnat_desig_full = Full_View (gnat_desig_full);
2856 else if (IN (Ekind (Root_Type (gnat_desig_type)),
2857 Incomplete_Or_Private_Kind))
2858 gnat_desig_full = Full_View (Root_Type (gnat_desig_type));
2861 if (Present (gnat_desig_full) && Is_Concurrent_Type (gnat_desig_full))
2862 gnat_desig_full = Corresponding_Record_Type (gnat_desig_full);
2864 /* If either the designated type or its full view is an
2865 unconstrained array subtype, replace it with the type it's a
2866 subtype of. This avoids problems with multiple copies of
2867 unconstrained array types. */
2868 if (Ekind (gnat_desig_type) == E_Array_Subtype
2869 && !Is_Constrained (gnat_desig_type))
2870 gnat_desig_type = Etype (gnat_desig_type);
2871 if (Present (gnat_desig_full)
2872 && Ekind (gnat_desig_full) == E_Array_Subtype
2873 && !Is_Constrained (gnat_desig_full))
2874 gnat_desig_full = Etype (gnat_desig_full);
2876 /* If the designated type is a subtype of an incomplete record type,
2877 use the parent type to avoid order of elaboration issues. This
2878 can lose some code efficiency, but there is no alternative. */
2879 if (Present (gnat_desig_full)
2880 && Ekind (gnat_desig_full) == E_Record_Subtype
2881 && Ekind (Etype (gnat_desig_full)) == E_Record_Type)
2882 gnat_desig_full = Etype (gnat_desig_full);
2884 /* If we are pointing to an incomplete type whose completion is an
2885 unconstrained array, make a fat pointer type instead of a pointer
2886 to VOID. The two types in our fields will be pointers to VOID and
2887 will be replaced in update_pointer_to. Similarly, if the type
2888 itself is a dummy type or an unconstrained array. Also make
2889 a dummy TYPE_OBJECT_RECORD_TYPE in case we have any thin
2892 if ((Present (gnat_desig_full)
2893 && Is_Array_Type (gnat_desig_full)
2894 && !Is_Constrained (gnat_desig_full))
2895 || (present_gnu_tree (gnat_desig_type)
2896 && TYPE_IS_DUMMY_P (TREE_TYPE
2897 (get_gnu_tree (gnat_desig_type)))
2898 && Is_Array_Type (gnat_desig_type)
2899 && !Is_Constrained (gnat_desig_type))
2900 || (present_gnu_tree (gnat_desig_type)
2901 && (TREE_CODE (TREE_TYPE (get_gnu_tree (gnat_desig_type)))
2902 == UNCONSTRAINED_ARRAY_TYPE)
2903 && !(TYPE_POINTER_TO (TREE_TYPE
2904 (get_gnu_tree (gnat_desig_type)))))
2905 || (No (gnat_desig_full) && !in_main_unit
2906 && defer_incomplete_level
2907 && !present_gnu_tree (gnat_desig_type)
2908 && Is_Array_Type (gnat_desig_type)
2909 && !Is_Constrained (gnat_desig_type)))
2912 = (present_gnu_tree (gnat_desig_type)
2913 ? gnat_to_gnu_type (gnat_desig_type)
2914 : make_dummy_type (gnat_desig_type));
2917 /* Show the dummy we get will be a fat pointer. */
2918 got_fat_p = made_dummy = true;
2920 /* If the call above got something that has a pointer, that
2921 pointer is our type. This could have happened either
2922 because the type was elaborated or because somebody
2923 else executed the code below. */
2924 gnu_type = TYPE_POINTER_TO (gnu_old);
2927 gnu_type = make_node (RECORD_TYPE);
2928 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old);
2929 TYPE_POINTER_TO (gnu_old) = gnu_type;
2931 Sloc_to_locus (Sloc (gnat_entity), &input_location);
2933 = chainon (chainon (NULL_TREE,
2935 (get_identifier ("P_ARRAY"),
2936 ptr_void_type_node, gnu_type,
2938 create_field_decl (get_identifier ("P_BOUNDS"),
2940 gnu_type, 0, 0, 0, 0));
2942 /* Make sure we can place this into a register. */
2943 TYPE_ALIGN (gnu_type)
2944 = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
2945 TYPE_IS_FAT_POINTER_P (gnu_type) = 1;
2946 finish_record_type (gnu_type, fields, false, true);
2948 TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
2949 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
2950 = concat_id_with_name (get_entity_name (gnat_desig_type),
2952 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1;
2956 /* If we already know what the full type is, use it. */
2957 else if (Present (gnat_desig_full)
2958 && present_gnu_tree (gnat_desig_full))
2959 gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full));
2961 /* Get the type of the thing we are to point to and build a pointer
2962 to it. If it is a reference to an incomplete or private type with a
2963 full view that is a record, make a dummy type node and get the
2964 actual type later when we have verified it is safe. */
2965 else if (!in_main_unit
2966 && !present_gnu_tree (gnat_desig_type)
2967 && Present (gnat_desig_full)
2968 && !present_gnu_tree (gnat_desig_full)
2969 && Is_Record_Type (gnat_desig_full))
2971 gnu_desig_type = make_dummy_type (gnat_desig_type);
2975 /* Likewise if we are pointing to a record or array and we are to defer
2976 elaborating incomplete types. We do this since this access type
2977 may be the full view of some private type. Note that the
2978 unconstrained array case is handled above. */
2979 else if ((!in_main_unit || imported_p) && defer_incomplete_level != 0
2980 && !present_gnu_tree (gnat_desig_type)
2981 && ((Is_Record_Type (gnat_desig_type)
2982 || Is_Array_Type (gnat_desig_type))
2983 || (Present (gnat_desig_full)
2984 && (Is_Record_Type (gnat_desig_full)
2985 || Is_Array_Type (gnat_desig_full)))))
2987 gnu_desig_type = make_dummy_type (gnat_desig_type);
2990 else if (gnat_desig_type == gnat_entity)
2993 = build_pointer_type_for_mode (make_node (VOID_TYPE),
2995 No_Strict_Aliasing (gnat_entity));
2996 TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type;
2999 gnu_desig_type = gnat_to_gnu_type (gnat_desig_type);
3001 /* It is possible that the above call to gnat_to_gnu_type resolved our
3002 type. If so, just return it. */
3003 if (present_gnu_tree (gnat_entity))
3005 maybe_present = true;
3009 /* If we have a GCC type for the designated type, possibly modify it
3010 if we are pointing only to constant objects and then make a pointer
3011 to it. Don't do this for unconstrained arrays. */
3012 if (!gnu_type && gnu_desig_type)
3014 if (Is_Access_Constant (gnat_entity)
3015 && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE)
3018 = build_qualified_type
3020 TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST);
3022 /* Some extra processing is required if we are building a
3023 pointer to an incomplete type (in the GCC sense). We might
3024 have such a type if we just made a dummy, or directly out
3025 of the call to gnat_to_gnu_type above if we are processing
3026 an access type for a record component designating the
3027 record type itself. */
3028 if (TYPE_MODE (gnu_desig_type) == VOIDmode)
3030 /* We must ensure that the pointer to variant we make will
3031 be processed by update_pointer_to when the initial type
3032 is completed. Pretend we made a dummy and let further
3033 processing act as usual. */
3036 /* We must ensure that update_pointer_to will not retrieve
3037 the dummy variant when building a properly qualified
3038 version of the complete type. We take advantage of the
3039 fact that get_qualified_type is requiring TYPE_NAMEs to
3040 match to influence build_qualified_type and then also
3041 update_pointer_to here. */
3042 TYPE_NAME (gnu_desig_type)
3043 = create_concat_name (gnat_desig_type, "INCOMPLETE_CST");
3048 = build_pointer_type_for_mode (gnu_desig_type, p_mode,
3049 No_Strict_Aliasing (gnat_entity));
3052 /* If we are not defining this object and we made a dummy pointer,
3053 save our current definition, evaluate the actual type, and replace
3054 the tentative type we made with the actual one. If we are to defer
3055 actually looking up the actual type, make an entry in the
3058 if (!in_main_unit && made_dummy)
3061 = TYPE_FAT_POINTER_P (gnu_type)
3062 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type);
3064 if (esize == POINTER_SIZE
3065 && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type)))
3067 = build_pointer_type
3068 (TYPE_OBJECT_RECORD_TYPE
3069 (TYPE_UNCONSTRAINED_ARRAY (gnu_type)));
3071 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3072 !Comes_From_Source (gnat_entity),
3073 debug_info_p, gnat_entity);
3074 save_gnu_tree (gnat_entity, gnu_decl, false);
3075 this_made_decl = saved = true;
3077 if (defer_incomplete_level == 0)
3078 /* Note that the call to gnat_to_gnu_type here might have
3079 updated gnu_old_type directly, in which case it is not a
3080 dummy type any more when we get into update_pointer_to.
3082 This may happen for instance when the designated type is a
3083 record type, because their elaboration starts with an
3084 initial node from make_dummy_type, which may yield the same
3085 node as the one we got.
3087 Besides, variants of this non-dummy type might have been
3088 created along the way. update_pointer_to is expected to
3089 properly take care of those situations. */
3090 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type),
3091 gnat_to_gnu_type (gnat_desig_type));
3094 struct incomplete *p
3095 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3097 p->old_type = gnu_old_type;
3098 p->full_type = gnat_desig_type;
3099 p->next = defer_incomplete_list;
3100 defer_incomplete_list = p;
3106 case E_Access_Protected_Subprogram_Type:
3107 case E_Anonymous_Access_Protected_Subprogram_Type:
3108 if (type_annotate_only && No (Equivalent_Type (gnat_entity)))
3109 gnu_type = build_pointer_type (void_type_node);
3111 /* The runtime representation is the equivalent type. */
3112 gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
3114 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3115 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3116 && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))
3117 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity))))
3118 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3123 case E_Access_Subtype:
3125 /* We treat this as identical to its base type; any constraint is
3126 meaningful only to the front end.
3128 The designated type must be elaborated as well, if it does
3129 not have its own freeze node. Designated (sub)types created
3130 for constrained components of records with discriminants are
3131 not frozen by the front end and thus not elaborated by gigi,
3132 because their use may appear before the base type is frozen,
3133 and because it is not clear that they are needed anywhere in
3134 Gigi. With the current model, there is no correct place where
3135 they could be elaborated. */
3137 gnu_type = gnat_to_gnu_type (Etype (gnat_entity));
3138 if (Is_Itype (Directly_Designated_Type (gnat_entity))
3139 && !present_gnu_tree (Directly_Designated_Type (gnat_entity))
3140 && Is_Frozen (Directly_Designated_Type (gnat_entity))
3141 && No (Freeze_Node (Directly_Designated_Type (gnat_entity))))
3143 /* If we are not defining this entity, and we have incomplete
3144 entities being processed above us, make a dummy type and
3145 elaborate it later. */
3146 if (!definition && defer_incomplete_level != 0)
3148 struct incomplete *p
3149 = (struct incomplete *) xmalloc (sizeof (struct incomplete));
3151 = build_pointer_type
3152 (make_dummy_type (Directly_Designated_Type (gnat_entity)));
3154 p->old_type = TREE_TYPE (gnu_ptr_type);
3155 p->full_type = Directly_Designated_Type (gnat_entity);
3156 p->next = defer_incomplete_list;
3157 defer_incomplete_list = p;
3159 else if (IN (Ekind (Base_Type
3160 (Directly_Designated_Type (gnat_entity))),
3161 Incomplete_Or_Private_Kind))
3164 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity),
3168 maybe_present = true;
3171 /* Subprogram Entities
3173 The following access functions are defined for subprograms (functions
3176 First_Formal The first formal parameter.
3177 Is_Imported Indicates that the subprogram has appeared in
3178 an INTERFACE or IMPORT pragma. For now we
3179 assume that the external language is C.
3180 Is_Inlined True if the subprogram is to be inlined.
3182 In addition for function subprograms we have:
3184 Etype Return type of the function.
3186 Each parameter is first checked by calling must_pass_by_ref on its
3187 type to determine if it is passed by reference. For parameters which
3188 are copied in, if they are Ada IN OUT or OUT parameters, their return
3189 value becomes part of a record which becomes the return type of the
3190 function (C function - note that this applies only to Ada procedures
3191 so there is no Ada return type). Additional code to store back the
3192 parameters will be generated on the caller side. This transformation
3193 is done here, not in the front-end.
3195 The intended result of the transformation can be seen from the
3196 equivalent source rewritings that follow:
3198 struct temp {int a,b};
3199 procedure P (A,B: IN OUT ...) is temp P (int A,B) {
3201 end P; return {A,B};
3211 For subprogram types we need to perform mainly the same conversions to
3212 GCC form that are needed for procedures and function declarations. The
3213 only difference is that at the end, we make a type declaration instead
3214 of a function declaration. */
3216 case E_Subprogram_Type:
3220 /* The first GCC parameter declaration (a PARM_DECL node). The
3221 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3222 actually is the head of this parameter list. */
3223 tree gnu_param_list = NULL_TREE;
3224 /* The type returned by a function. If the subprogram is a procedure
3225 this type should be void_type_node. */
3226 tree gnu_return_type = void_type_node;
3227 /* List of fields in return type of procedure with copy in copy out
3229 tree gnu_field_list = NULL_TREE;
3230 /* Non-null for subprograms containing parameters passed by copy in
3231 copy out (Ada IN OUT or OUT parameters not passed by reference),
3232 in which case it is the list of nodes used to specify the values of
3233 the in out/out parameters that are returned as a record upon
3234 procedure return. The TREE_PURPOSE of an element of this list is
3235 a field of the record and the TREE_VALUE is the PARM_DECL
3236 corresponding to that field. This list will be saved in the
3237 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3238 tree gnu_return_list = NULL_TREE;
3239 /* If an import pragma asks to map this subprogram to a GCC builtin,
3240 this is the builtin DECL node. */
3241 tree gnu_builtin_decl = NULL_TREE;
3242 Entity_Id gnat_param;
3243 bool inline_flag = Is_Inlined (gnat_entity);
3244 bool public_flag = Is_Public (gnat_entity);
3246 = (Is_Public (gnat_entity) && !definition) || imported_p;
3247 bool pure_flag = Is_Pure (gnat_entity);
3248 bool volatile_flag = No_Return (gnat_entity);
3249 bool returns_by_ref = false;
3250 bool returns_unconstrained = false;
3251 bool returns_by_target_ptr = false;
3252 tree gnu_ext_name = create_concat_name (gnat_entity, 0);
3253 bool has_copy_in_out = false;
3256 if (kind == E_Subprogram_Type && !definition)
3257 /* A parameter may refer to this type, so defer completion
3258 of any incomplete types. */
3259 defer_incomplete_level++, this_deferred = true;
3261 /* If the subprogram has an alias, it is probably inherited, so
3262 we can use the original one. If the original "subprogram"
3263 is actually an enumeration literal, it may be the first use
3264 of its type, so we must elaborate that type now. */
3265 if (Present (Alias (gnat_entity)))
3267 if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal)
3268 gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0);
3270 gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity),
3273 /* Elaborate any Itypes in the parameters of this entity. */
3274 for (gnat_temp = First_Formal (gnat_entity);
3275 Present (gnat_temp);
3276 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3277 if (Is_Itype (Etype (gnat_temp)))
3278 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3283 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3284 corresponding DECL node.
3286 We still want the parameter associations to take place because the
3287 proper generation of calls depends on it (a GNAT parameter without
3288 a corresponding GCC tree has a very specific meaning), so we don't
3290 if (Convention (gnat_entity) == Convention_Intrinsic)
3291 gnu_builtin_decl = builtin_decl_for (gnu_ext_name);
3293 /* ??? What if we don't find the builtin node above ? warn ? err ?
3294 In the current state we neither warn nor err, and calls will just
3295 be handled as for regular subprograms. */
3297 if (kind == E_Function || kind == E_Subprogram_Type)
3298 gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
3300 /* If this function returns by reference, make the actual
3301 return type of this function the pointer and mark the decl. */
3302 if (Returns_By_Ref (gnat_entity))
3304 returns_by_ref = true;
3305 gnu_return_type = build_pointer_type (gnu_return_type);
3308 /* If the Mechanism is By_Reference, ensure the return type uses
3309 the machine's by-reference mechanism, which may not the same
3310 as above (e.g., it might be by passing a fake parameter). */
3311 else if (kind == E_Function
3312 && Mechanism (gnat_entity) == By_Reference)
3314 gnu_return_type = copy_type (gnu_return_type);
3315 TREE_ADDRESSABLE (gnu_return_type) = 1;
3318 /* If we are supposed to return an unconstrained array,
3319 actually return a fat pointer and make a note of that. Return
3320 a pointer to an unconstrained record of variable size. */
3321 else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
3323 gnu_return_type = TREE_TYPE (gnu_return_type);
3324 returns_unconstrained = true;
3327 /* If the type requires a transient scope, the result is allocated
3328 on the secondary stack, so the result type of the function is
3330 else if (Requires_Transient_Scope (Etype (gnat_entity)))
3332 gnu_return_type = build_pointer_type (gnu_return_type);
3333 returns_unconstrained = true;
3336 /* If the type is a padded type and the underlying type would not
3337 be passed by reference or this function has a foreign convention,
3338 return the underlying type. */
3339 else if (TREE_CODE (gnu_return_type) == RECORD_TYPE
3340 && TYPE_IS_PADDING_P (gnu_return_type)
3341 && (!default_pass_by_ref (TREE_TYPE
3342 (TYPE_FIELDS (gnu_return_type)))
3343 || Has_Foreign_Convention (gnat_entity)))
3344 gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
3346 /* If the return type is unconstrained, that means it must have a
3347 maximum size. We convert the function into a procedure and its
3348 caller will pass a pointer to an object of that maximum size as the
3349 first parameter when we call the function. */
3350 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type)))
3352 returns_by_target_ptr = true;
3354 = create_param_decl (get_identifier ("TARGET"),
3355 build_reference_type (gnu_return_type),
3357 gnu_return_type = void_type_node;
3360 /* If the return type has a size that overflows, we cannot have
3361 a function that returns that type. This usage doesn't make
3362 sense anyway, so give an error here. */
3363 if (TYPE_SIZE_UNIT (gnu_return_type)
3364 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type)))
3366 post_error ("cannot return type whose size overflows",
3368 gnu_return_type = copy_node (gnu_return_type);
3369 TYPE_SIZE (gnu_return_type) = bitsize_zero_node;
3370 TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node;
3371 TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type;
3372 TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE;
3375 /* Look at all our parameters and get the type of
3376 each. While doing this, build a copy-out structure if
3379 for (gnat_param = First_Formal (gnat_entity), parmnum = 0;
3380 Present (gnat_param);
3381 gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++)
3383 tree gnu_param_name = get_entity_name (gnat_param);
3384 tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param));
3385 tree gnu_param, gnu_field;
3386 bool by_ref_p = false;
3387 bool by_descr_p = false;
3388 bool by_component_ptr_p = false;
3389 bool copy_in_copy_out_flag = false;
3390 bool req_by_copy = false, req_by_ref = false;
3392 /* Builtins are expanded inline and there is no real call sequence
3393 involved. so the type expected by the underlying expander is
3394 always the type of each argument "as is". */
3395 if (gnu_builtin_decl)
3398 /* Otherwise, see if a Mechanism was supplied that forced this
3399 parameter to be passed one way or another. */
3400 else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3402 else if (Mechanism (gnat_param) == Default)
3404 else if (Mechanism (gnat_param) == By_Copy)
3406 else if (Mechanism (gnat_param) == By_Reference)
3408 else if (Mechanism (gnat_param) <= By_Descriptor)
3410 else if (Mechanism (gnat_param) > 0)
3412 if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE
3413 || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST
3414 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type),
3415 Mechanism (gnat_param)))
3421 post_error ("unsupported mechanism for&", gnat_param);
3423 /* If this is either a foreign function or if the
3424 underlying type won't be passed by reference, strip off
3425 possible padding type. */
3426 if (TREE_CODE (gnu_param_type) == RECORD_TYPE
3427 && TYPE_IS_PADDING_P (gnu_param_type)
3428 && (req_by_ref || Has_Foreign_Convention (gnat_entity)
3429 || !must_pass_by_ref (TREE_TYPE (TYPE_FIELDS
3430 (gnu_param_type)))))
3431 gnu_param_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type));
3433 /* If this is an IN parameter it is read-only, so make a variant
3434 of the type that is read-only.
3436 ??? However, if this is an unconstrained array, that type can
3437 be very complex. So skip it for now. Likewise for any other
3438 self-referential type. */
3439 if (Ekind (gnat_param) == E_In_Parameter
3440 && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE
3441 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type)))
3443 = build_qualified_type (gnu_param_type,
3444 (TYPE_QUALS (gnu_param_type)
3445 | TYPE_QUAL_CONST));
3447 /* For foreign conventions, pass arrays as a pointer to the
3448 underlying type. First check for unconstrained array and get
3449 the underlying array. Then get the component type and build
3451 if (Has_Foreign_Convention (gnat_entity)
3452 && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE)
3454 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS
3455 (TREE_TYPE (gnu_param_type))));
3459 = build_pointer_type
3460 (build_vms_descriptor (gnu_param_type,
3461 Mechanism (gnat_param), gnat_entity));
3463 else if (Has_Foreign_Convention (gnat_entity)
3465 && TREE_CODE (gnu_param_type) == ARRAY_TYPE)
3467 /* Strip off any multi-dimensional entries, then strip
3468 off the last array to get the component type. */
3469 while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE
3470 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type)))
3471 gnu_param_type = TREE_TYPE (gnu_param_type);
3473 by_component_ptr_p = true;
3474 gnu_param_type = TREE_TYPE (gnu_param_type);
3476 if (Ekind (gnat_param) == E_In_Parameter)
3478 = build_qualified_type (gnu_param_type,
3479 (TYPE_QUALS (gnu_param_type)
3480 | TYPE_QUAL_CONST));
3482 gnu_param_type = build_pointer_type (gnu_param_type);
3485 /* Fat pointers are passed as thin pointers for foreign
3487 else if (Has_Foreign_Convention (gnat_entity)
3488 && TYPE_FAT_POINTER_P (gnu_param_type))
3490 = make_type_from_size (gnu_param_type,
3491 size_int (POINTER_SIZE), false);
3493 /* If we must pass or were requested to pass by reference, do so.
3494 If we were requested to pass by copy, do so.
3495 Otherwise, for foreign conventions, pass all in out parameters
3496 or aggregates by reference. For COBOL and Fortran, pass
3497 all integer and FP types that way too. For Convention Ada,
3498 use the standard Ada default. */
3499 else if (must_pass_by_ref (gnu_param_type) || req_by_ref
3501 && ((Has_Foreign_Convention (gnat_entity)
3502 && (Ekind (gnat_param) != E_In_Parameter
3503 || AGGREGATE_TYPE_P (gnu_param_type)))
3504 || (((Convention (gnat_entity)
3505 == Convention_Fortran)
3506 || (Convention (gnat_entity)
3507 == Convention_COBOL))
3508 && (INTEGRAL_TYPE_P (gnu_param_type)
3509 || FLOAT_TYPE_P (gnu_param_type)))
3510 /* For convention Ada, see if we pass by reference
3512 || (!Has_Foreign_Convention (gnat_entity)
3513 && default_pass_by_ref (gnu_param_type)))))
3515 gnu_param_type = build_reference_type (gnu_param_type);
3519 else if (Ekind (gnat_param) != E_In_Parameter)
3520 copy_in_copy_out_flag = true;
3522 if (req_by_copy && (by_ref_p || by_component_ptr_p))
3523 post_error ("?cannot pass & by copy", gnat_param);
3525 /* If this is an OUT parameter that isn't passed by reference
3526 and isn't a pointer or aggregate, we don't make a PARM_DECL
3527 for it. Instead, it will be a VAR_DECL created when we process
3528 the procedure. For the special parameter of Valued_Procedure,
3531 An exception is made to cover the RM-6.4.1 rule requiring "by
3532 copy" out parameters with discriminants or implicit initial
3533 values to be handled like in out parameters. These type are
3534 normally built as aggregates, and hence passed by reference,
3535 except for some packed arrays which end up encoded in special
3538 The exception we need to make is then for packed arrays of
3539 records with discriminants or implicit initial values. We have
3540 no light/easy way to check for the latter case, so we merely
3541 check for packed arrays of records. This may lead to useless
3542 copy-in operations, but in very rare cases only, as these would
3543 be exceptions in a set of already exceptional situations. */
3544 if (Ekind (gnat_param) == E_Out_Parameter && !by_ref_p
3545 && ((Is_Valued_Procedure (gnat_entity) && parmnum == 0)
3547 && !POINTER_TYPE_P (gnu_param_type)
3548 && !AGGREGATE_TYPE_P (gnu_param_type)))
3549 && !(Is_Array_Type (Etype (gnat_param))
3550 && Is_Packed (Etype (gnat_param))
3551 && Is_Composite_Type (Component_Type
3552 (Etype (gnat_param)))))
3553 gnu_param = NULL_TREE;
3558 (gnu_param_name, gnu_param_type,
3559 by_ref_p || by_component_ptr_p
3560 || Ekind (gnat_param) == E_In_Parameter);
3562 DECL_BY_REF_P (gnu_param) = by_ref_p;
3563 DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr_p;
3564 DECL_BY_DESCRIPTOR_P (gnu_param) = by_descr_p;
3565 DECL_POINTS_TO_READONLY_P (gnu_param)
3566 = (Ekind (gnat_param) == E_In_Parameter
3567 && (by_ref_p || by_component_ptr_p));
3568 Sloc_to_locus (Sloc (gnat_param),
3569 &DECL_SOURCE_LOCATION (gnu_param));
3570 save_gnu_tree (gnat_param, gnu_param, false);
3571 gnu_param_list = chainon (gnu_param, gnu_param_list);
3573 /* If a parameter is a pointer, this function may modify
3574 memory through it and thus shouldn't be considered
3575 a pure function. Also, the memory may be modified
3576 between two calls, so they can't be CSE'ed. The latter
3577 case also handles by-ref parameters. */
3578 if (POINTER_TYPE_P (gnu_param_type)
3579 || TYPE_FAT_POINTER_P (gnu_param_type))
3583 if (copy_in_copy_out_flag)
3585 if (!has_copy_in_out)
3587 gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
3588 gnu_return_type = make_node (RECORD_TYPE);
3589 TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
3590 has_copy_in_out = true;
3593 gnu_field = create_field_decl (gnu_param_name, gnu_param_type,
3594 gnu_return_type, 0, 0, 0, 0);
3595 Sloc_to_locus (Sloc (gnat_param),
3596 &DECL_SOURCE_LOCATION (gnu_field));
3597 TREE_CHAIN (gnu_field) = gnu_field_list;
3598 gnu_field_list = gnu_field;
3599 gnu_return_list = tree_cons (gnu_field, gnu_param,
3604 /* Do not compute record for out parameters if subprogram is
3605 stubbed since structures are incomplete for the back-end. */
3607 && Convention (gnat_entity) != Convention_Stubbed)
3609 /* If all types are not complete, defer emission of debug
3610 information for this record types. Otherwise, we risk emitting
3611 debug information for a dummy type contained in the fields
3613 finish_record_type (gnu_return_type, nreverse (gnu_field_list),
3614 false, defer_incomplete_level);
3616 if (defer_incomplete_level)
3618 debug_deferred = true;
3619 defer_debug_level++;
3621 defer_debug_incomplete_list
3622 = tree_cons (NULL_TREE, gnu_return_type,
3623 defer_debug_incomplete_list);
3627 /* If we have a CICO list but it has only one entry, we convert
3628 this function into a function that simply returns that one
3630 if (list_length (gnu_return_list) == 1)
3631 gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
3634 if (Convention (gnat_entity) == Convention_Stdcall)
3637 = (struct attrib *) xmalloc (sizeof (struct attrib));
3639 attr->next = attr_list;
3640 attr->type = ATTR_MACHINE_ATTRIBUTE;
3641 attr->name = get_identifier ("stdcall");
3642 attr->args = NULL_TREE;
3643 attr->error_point = gnat_entity;
3648 /* Both lists ware built in reverse. */
3649 gnu_param_list = nreverse (gnu_param_list);
3650 gnu_return_list = nreverse (gnu_return_list);
3653 = create_subprog_type (gnu_return_type, gnu_param_list,
3654 gnu_return_list, returns_unconstrained,
3656 Function_Returns_With_DSP (gnat_entity),
3657 returns_by_target_ptr);
3659 /* A subprogram (something that doesn't return anything) shouldn't
3660 be considered Pure since there would be no reason for such a
3661 subprogram. Note that procedures with Out (or In Out) parameters
3662 have already been converted into a function with a return type. */
3663 if (TREE_CODE (gnu_return_type) == VOID_TYPE)
3667 = build_qualified_type (gnu_type,
3668 (TYPE_QUALS (gnu_type)
3669 | (TYPE_QUAL_CONST * pure_flag)
3670 | (TYPE_QUAL_VOLATILE * volatile_flag)));
3672 Sloc_to_locus (Sloc (gnat_entity), &input_location);
3674 /* If we have a builtin decl for that function, check the signatures
3675 compatibilities. If the signatures are compatible, use the builtin
3676 decl. If they are not, we expect the checker predicate to have
3677 posted the appropriate errors, and just continue with what we have
3679 if (gnu_builtin_decl)
3681 tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl);
3683 if (compatible_signatures_p (gnu_type, gnu_builtin_type))
3685 gnu_decl = gnu_builtin_decl;
3686 gnu_type = gnu_builtin_type;
3691 /* If there was no specified Interface_Name and the external and
3692 internal names of the subprogram are the same, only use the
3693 internal name to allow disambiguation of nested subprograms. */
3694 if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_id)
3695 gnu_ext_name = NULL_TREE;
3697 /* If we are defining the subprogram and it has an Address clause
3698 we must get the address expression from the saved GCC tree for the
3699 subprogram if it has a Freeze_Node. Otherwise, we elaborate
3700 the address expression here since the front-end has guaranteed
3701 in that case that the elaboration has no effects. If there is
3702 an Address clause and we are not defining the object, just
3703 make it a constant. */
3704 if (Present (Address_Clause (gnat_entity)))
3706 tree gnu_address = NULL_TREE;
3710 = (present_gnu_tree (gnat_entity)
3711 ? get_gnu_tree (gnat_entity)
3712 : gnat_to_gnu (Expression (Address_Clause (gnat_entity))));
3714 save_gnu_tree (gnat_entity, NULL_TREE, false);
3716 gnu_type = build_reference_type (gnu_type);
3718 gnu_address = convert (gnu_type, gnu_address);
3721 = create_var_decl (gnu_entity_id, gnu_ext_name, gnu_type,
3722 gnu_address, false, Is_Public (gnat_entity),
3723 extern_flag, false, NULL, gnat_entity);
3724 DECL_BY_REF_P (gnu_decl) = 1;
3727 else if (kind == E_Subprogram_Type)
3728 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3729 !Comes_From_Source (gnat_entity),
3730 debug_info_p && !defer_incomplete_level,
3734 gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name,
3735 gnu_type, gnu_param_list,
3736 inline_flag, public_flag,
3737 extern_flag, attr_list,
3739 DECL_STUBBED_P (gnu_decl)
3740 = Convention (gnat_entity) == Convention_Stubbed;
3745 case E_Incomplete_Type:
3746 case E_Private_Type:
3747 case E_Limited_Private_Type:
3748 case E_Record_Type_With_Private:
3749 case E_Private_Subtype:
3750 case E_Limited_Private_Subtype:
3751 case E_Record_Subtype_With_Private:
3753 /* If this type does not have a full view in the unit we are
3754 compiling, then just get the type from its Etype. */
3755 if (No (Full_View (gnat_entity)))
3757 /* If this is an incomplete type with no full view, it must
3758 be a Taft Amendement type, so just return a dummy type. */
3759 if (kind == E_Incomplete_Type)
3760 gnu_type = make_dummy_type (gnat_entity);
3762 else if (Present (Underlying_Full_View (gnat_entity)))
3763 gnu_decl = gnat_to_gnu_entity (Underlying_Full_View (gnat_entity),
3767 gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity),
3769 maybe_present = true;
3775 /* Otherwise, if we are not defining the type now, get the
3776 type from the full view. But always get the type from the full
3777 view for define on use types, since otherwise we won't see them! */
3779 else if (!definition
3780 || (Is_Itype (Full_View (gnat_entity))
3781 && No (Freeze_Node (gnat_entity)))
3782 || (Is_Itype (gnat_entity)
3783 && No (Freeze_Node (Full_View (gnat_entity)))))
3785 gnu_decl = gnat_to_gnu_entity (Full_View (gnat_entity),
3787 maybe_present = true;
3791 /* For incomplete types, make a dummy type entry which will be
3793 gnu_type = make_dummy_type (gnat_entity);
3795 /* Save this type as the full declaration's type so we can do any needed
3796 updates when we see it. */
3797 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
3798 !Comes_From_Source (gnat_entity),
3799 debug_info_p, gnat_entity);
3800 save_gnu_tree (Full_View (gnat_entity), gnu_decl, false);
3803 /* Simple class_wide types are always viewed as their root_type
3804 by Gigi unless an Equivalent_Type is specified. */
3805 case E_Class_Wide_Type:
3806 if (Present (Equivalent_Type (gnat_entity)))
3807 gnu_type = gnat_to_gnu_type (Equivalent_Type (gnat_entity));
3809 gnu_type = gnat_to_gnu_type (Root_Type (gnat_entity));
3811 maybe_present = true;
3815 case E_Task_Subtype:
3816 case E_Protected_Type:
3817 case E_Protected_Subtype:
3818 if (type_annotate_only && No (Corresponding_Record_Type (gnat_entity)))
3819 gnu_type = void_type_node;
3821 gnu_type = gnat_to_gnu_type (Corresponding_Record_Type (gnat_entity));
3823 maybe_present = true;
3827 gnu_decl = create_label_decl (gnu_entity_id);
3832 /* Nothing at all to do here, so just return an ERROR_MARK and claim
3833 we've already saved it, so we don't try to. */
3834 gnu_decl = error_mark_node;
3842 /* If we had a case where we evaluated another type and it might have
3843 defined this one, handle it here. */
3844 if (maybe_present && present_gnu_tree (gnat_entity))
3846 gnu_decl = get_gnu_tree (gnat_entity);
3850 /* If we are processing a type and there is either no decl for it or
3851 we just made one, do some common processing for the type, such as
3852 handling alignment and possible padding. */
3854 if ((!gnu_decl || this_made_decl) && IN (kind, Type_Kind))
3856 if (Is_Tagged_Type (gnat_entity)
3857 || Is_Class_Wide_Equivalent_Type (gnat_entity))
3858 TYPE_ALIGN_OK (gnu_type) = 1;
3860 if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
3861 TYPE_BY_REFERENCE_P (gnu_type) = 1;
3863 /* ??? Don't set the size for a String_Literal since it is either
3864 confirming or we don't handle it properly (if the low bound is
3866 if (!gnu_size && kind != E_String_Literal_Subtype)
3867 gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity,
3869 Has_Size_Clause (gnat_entity));
3871 /* If a size was specified, see if we can make a new type of that size
3872 by rearranging the type, for example from a fat to a thin pointer. */
3876 = make_type_from_size (gnu_type, gnu_size,
3877 Has_Biased_Representation (gnat_entity));
3879 if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)
3880 && operand_equal_p (rm_size (gnu_type), gnu_size, 0))
3884 /* If the alignment hasn't already been processed and this is
3885 not an unconstrained array, see if an alignment is specified.
3886 If not, we pick a default alignment for atomic objects. */
3887 if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
3889 else if (Known_Alignment (gnat_entity))
3890 align = validate_alignment (Alignment (gnat_entity), gnat_entity,
3891 TYPE_ALIGN (gnu_type));
3892 else if (Is_Atomic (gnat_entity) && !gnu_size
3893 && host_integerp (TYPE_SIZE (gnu_type), 1)
3894 && integer_pow2p (TYPE_SIZE (gnu_type)))
3895 align = MIN (BIGGEST_ALIGNMENT,
3896 tree_low_cst (TYPE_SIZE (gnu_type), 1));
3897 else if (Is_Atomic (gnat_entity) && gnu_size
3898 && host_integerp (gnu_size, 1)
3899 && integer_pow2p (gnu_size))
3900 align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1));
3902 /* See if we need to pad the type. If we did, and made a record,
3903 the name of the new type may be changed. So get it back for
3904 us when we make the new TYPE_DECL below. */
3905 gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, "PAD",
3906 true, definition, false);
3907 if (TREE_CODE (gnu_type) == RECORD_TYPE
3908 && TYPE_IS_PADDING_P (gnu_type))
3910 gnu_entity_id = TYPE_NAME (gnu_type);
3911 if (TREE_CODE (gnu_entity_id) == TYPE_DECL)
3912 gnu_entity_id = DECL_NAME (gnu_entity_id);
3915 set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity);
3917 /* If we are at global level, GCC will have applied variable_size to
3918 the type, but that won't have done anything. So, if it's not
3919 a constant or self-referential, call elaborate_expression_1 to
3920 make a variable for the size rather than calculating it each time.
3921 Handle both the RM size and the actual size. */
3922 if (global_bindings_p ()
3923 && TYPE_SIZE (gnu_type)
3924 && !TREE_CONSTANT (TYPE_SIZE (gnu_type))
3925 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)))
3927 if (TREE_CODE (gnu_type) == RECORD_TYPE
3928 && operand_equal_p (TYPE_ADA_SIZE (gnu_type),
3929 TYPE_SIZE (gnu_type), 0))
3931 TYPE_SIZE (gnu_type)
3932 = elaborate_expression_1 (gnat_entity, gnat_entity,
3933 TYPE_SIZE (gnu_type),
3934 get_identifier ("SIZE"),
3936 SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type));
3940 TYPE_SIZE (gnu_type)
3941 = elaborate_expression_1 (gnat_entity, gnat_entity,
3942 TYPE_SIZE (gnu_type),
3943 get_identifier ("SIZE"),
3946 /* ??? For now, store the size as a multiple of the alignment
3947 in bytes so that we can see the alignment from the tree. */
3948 TYPE_SIZE_UNIT (gnu_type)
3950 (MULT_EXPR, sizetype,
3951 elaborate_expression_1
3952 (gnat_entity, gnat_entity,
3953 build_binary_op (EXACT_DIV_EXPR, sizetype,
3954 TYPE_SIZE_UNIT (gnu_type),
3955 size_int (TYPE_ALIGN (gnu_type)
3957 get_identifier ("SIZE_A_UNIT"),
3959 size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
3961 if (TREE_CODE (gnu_type) == RECORD_TYPE)
3964 elaborate_expression_1 (gnat_entity,
3966 TYPE_ADA_SIZE (gnu_type),
3967 get_identifier ("RM_SIZE"),
3972 /* If this is a record type or subtype, call elaborate_expression_1 on
3973 any field position. Do this for both global and local types.
3974 Skip any fields that we haven't made trees for to avoid problems with
3975 class wide types. */
3976 if (IN (kind, Record_Kind))
3977 for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp);
3978 gnat_temp = Next_Entity (gnat_temp))
3979 if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp))
3981 tree gnu_field = get_gnu_tree (gnat_temp);
3983 /* ??? Unfortunately, GCC needs to be able to prove the
3984 alignment of this offset and if it's a variable, it can't.
3985 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
3986 right now, we have to put in an explicit multiply and
3987 divide by that value. */
3988 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field)))
3989 DECL_FIELD_OFFSET (gnu_field)
3991 (MULT_EXPR, sizetype,
3992 elaborate_expression_1
3993 (gnat_temp, gnat_temp,
3994 build_binary_op (EXACT_DIV_EXPR, sizetype,
3995 DECL_FIELD_OFFSET (gnu_field),
3996 size_int (DECL_OFFSET_ALIGN (gnu_field)
3998 get_identifier ("OFFSET"),
4000 size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT));
4003 gnu_type = build_qualified_type (gnu_type,
4004 (TYPE_QUALS (gnu_type)
4005 | (TYPE_QUAL_VOLATILE
4006 * Treat_As_Volatile (gnat_entity))));
4008 if (Is_Atomic (gnat_entity))
4009 check_ok_for_atomic (gnu_type, gnat_entity, false);
4011 if (Known_Alignment (gnat_entity))
4012 TYPE_USER_ALIGN (gnu_type) = 1;
4015 gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list,
4016 !Comes_From_Source (gnat_entity),
4017 debug_info_p, gnat_entity);
4019 TREE_TYPE (gnu_decl) = gnu_type;
4022 if (IN (kind, Type_Kind) && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)))
4024 gnu_type = TREE_TYPE (gnu_decl);
4026 /* Back-annotate the Alignment of the type if not already in the
4027 tree. Likewise for sizes. */
4028 if (Unknown_Alignment (gnat_entity))
4029 Set_Alignment (gnat_entity,
4030 UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
4032 if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type))
4034 /* If the size is self-referential, we annotate the maximum
4035 value of that size. */
4036 tree gnu_size = TYPE_SIZE (gnu_type);
4038 if (CONTAINS_PLACEHOLDER_P (gnu_size))
4039 gnu_size = max_size (gnu_size, true);
4041 Set_Esize (gnat_entity, annotate_value (gnu_size));
4043 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
4045 /* In this mode the tag and the parent components are not
4046 generated by the front-end, so the sizes must be adjusted
4052 if (Is_Derived_Type (gnat_entity))
4055 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity))));
4056 Set_Alignment (gnat_entity,
4057 Alignment (Etype (Base_Type (gnat_entity))));
4060 size_offset = POINTER_SIZE;
4062 new_size = UI_To_Int (Esize (gnat_entity)) + size_offset;
4063 Set_Esize (gnat_entity,
4064 UI_From_Int (((new_size + (POINTER_SIZE - 1))
4065 / POINTER_SIZE) * POINTER_SIZE));
4066 Set_RM_Size (gnat_entity, Esize (gnat_entity));
4070 if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type))
4071 Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type)));
4074 if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl))
4075 DECL_ARTIFICIAL (gnu_decl) = 1;
4077 if (!debug_info_p && DECL_P (gnu_decl)
4078 && TREE_CODE (gnu_decl) != FUNCTION_DECL)
4079 DECL_IGNORED_P (gnu_decl) = 1;
4081 /* If we haven't already, associate the ..._DECL node that we just made with
4082 the input GNAT entity node. */
4084 save_gnu_tree (gnat_entity, gnu_decl, false);
4086 /* If this is an enumeral or floating-point type, we were not able to set
4087 the bounds since they refer to the type. These bounds are always static.
4089 For enumeration types, also write debugging information and declare the
4090 enumeration literal table, if needed. */
4092 if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity)))
4093 || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity)))
4095 tree gnu_scalar_type = gnu_type;
4097 /* If this is a padded type, we need to use the underlying type. */
4098 if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE
4099 && TYPE_IS_PADDING_P (gnu_scalar_type))
4100 gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type));
4102 /* If this is a floating point type and we haven't set a floating
4103 point type yet, use this in the evaluation of the bounds. */
4104 if (!longest_float_type_node && kind == E_Floating_Point_Type)
4105 longest_float_type_node = gnu_type;
4107 TYPE_MIN_VALUE (gnu_scalar_type)
4108 = gnat_to_gnu (Type_Low_Bound (gnat_entity));
4109 TYPE_MAX_VALUE (gnu_scalar_type)
4110 = gnat_to_gnu (Type_High_Bound (gnat_entity));
4112 if (TREE_CODE (gnu_scalar_type) == ENUMERAL_TYPE)
4114 TYPE_STUB_DECL (gnu_scalar_type) = gnu_decl;
4116 /* Since this has both a typedef and a tag, avoid outputting
4118 DECL_ARTIFICIAL (gnu_decl) = 1;
4119 rest_of_type_compilation (gnu_scalar_type, global_bindings_p ());
4123 /* If we deferred processing of incomplete types, re-enable it. If there
4124 were no other disables and we have some to process, do so. */
4125 if (this_deferred && --defer_incomplete_level == 0 && defer_incomplete_list)
4127 struct incomplete *incp = defer_incomplete_list;
4128 struct incomplete *next;
4130 defer_incomplete_list = NULL;
4131 for (; incp; incp = next)
4136 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4137 gnat_to_gnu_type (incp->full_type));
4142 /* If we are not defining this type, see if it's in the incomplete list.
4143 If so, handle that list entry now. */
4144 else if (!definition)
4146 struct incomplete *incp;
4148 for (incp = defer_incomplete_list; incp; incp = incp->next)
4149 if (incp->old_type && incp->full_type == gnat_entity)
4151 update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type),
4152 TREE_TYPE (gnu_decl));
4153 incp->old_type = NULL_TREE;
4157 /* If there are no incomplete types and we have deferred emission
4158 of debug information, check whether we have finished defining
4160 If so, handle the list now. */
4163 defer_debug_level--;
4165 if (defer_debug_incomplete_list
4166 && !defer_incomplete_level
4167 && !defer_debug_level)
4171 defer_debug_incomplete_list = nreverse (defer_debug_incomplete_list);
4173 for (c = defer_debug_incomplete_list; c; c = n)
4176 write_record_type_debug_info (TREE_VALUE (c));
4179 defer_debug_incomplete_list = 0;
4185 if (Is_Packed_Array_Type (gnat_entity)
4186 && Is_Itype (Associated_Node_For_Itype (gnat_entity))
4187 && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity)))
4188 && !present_gnu_tree (Associated_Node_For_Itype (gnat_entity)))
4189 gnat_to_gnu_entity (Associated_Node_For_Itype (gnat_entity), NULL_TREE, 0);
4194 /* Similar, but if the returned value is a COMPONENT_REF, return the
4198 gnat_to_gnu_field_decl (Entity_Id gnat_entity)
4200 tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4202 if (TREE_CODE (gnu_field) == COMPONENT_REF)
4203 gnu_field = TREE_OPERAND (gnu_field, 1);
4208 /* Given GNAT_ENTITY, elaborate all expressions that are required to
4209 be elaborated at the point of its definition, but do nothing else. */
4212 elaborate_entity (Entity_Id gnat_entity)
4214 switch (Ekind (gnat_entity))
4216 case E_Signed_Integer_Subtype:
4217 case E_Modular_Integer_Subtype:
4218 case E_Enumeration_Subtype:
4219 case E_Ordinary_Fixed_Point_Subtype:
4220 case E_Decimal_Fixed_Point_Subtype:
4221 case E_Floating_Point_Subtype:
4223 Node_Id gnat_lb = Type_Low_Bound (gnat_entity);
4224 Node_Id gnat_hb = Type_High_Bound (gnat_entity);
4226 /* ??? Tests for avoiding static constraint error expression
4227 is needed until the front stops generating bogus conversions
4228 on bounds of real types. */
4230 if (!Raises_Constraint_Error (gnat_lb))
4231 elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"),
4232 1, 0, Needs_Debug_Info (gnat_entity));
4233 if (!Raises_Constraint_Error (gnat_hb))
4234 elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"),
4235 1, 0, Needs_Debug_Info (gnat_entity));
4241 Node_Id full_definition = Declaration_Node (gnat_entity);
4242 Node_Id record_definition = Type_Definition (full_definition);
4244 /* If this is a record extension, go a level further to find the
4245 record definition. */
4246 if (Nkind (record_definition) == N_Derived_Type_Definition)
4247 record_definition = Record_Extension_Part (record_definition);
4251 case E_Record_Subtype:
4252 case E_Private_Subtype:
4253 case E_Limited_Private_Subtype:
4254 case E_Record_Subtype_With_Private:
4255 if (Is_Constrained (gnat_entity)
4256 && Has_Discriminants (Base_Type (gnat_entity))
4257 && Present (Discriminant_Constraint (gnat_entity)))
4259 Node_Id gnat_discriminant_expr;
4260 Entity_Id gnat_field;
4262 for (gnat_field = First_Discriminant (Base_Type (gnat_entity)),
4263 gnat_discriminant_expr
4264 = First_Elmt (Discriminant_Constraint (gnat_entity));
4265 Present (gnat_field);
4266 gnat_field = Next_Discriminant (gnat_field),
4267 gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr))
4268 /* ??? For now, ignore access discriminants. */
4269 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr))))
4270 elaborate_expression (Node (gnat_discriminant_expr),
4272 get_entity_name (gnat_field), 1, 0, 0);
4279 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
4280 any entities on its entity chain similarly. */
4283 mark_out_of_scope (Entity_Id gnat_entity)
4285 Entity_Id gnat_sub_entity;
4286 unsigned int kind = Ekind (gnat_entity);
4288 /* If this has an entity list, process all in the list. */
4289 if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind)
4290 || IN (kind, Private_Kind)
4291 || kind == E_Block || kind == E_Entry || kind == E_Entry_Family
4292 || kind == E_Function || kind == E_Generic_Function
4293 || kind == E_Generic_Package || kind == E_Generic_Procedure
4294 || kind == E_Loop || kind == E_Operator || kind == E_Package
4295 || kind == E_Package_Body || kind == E_Procedure
4296 || kind == E_Record_Type || kind == E_Record_Subtype
4297 || kind == E_Subprogram_Body || kind == E_Subprogram_Type)
4298 for (gnat_sub_entity = First_Entity (gnat_entity);
4299 Present (gnat_sub_entity);
4300 gnat_sub_entity = Next_Entity (gnat_sub_entity))
4301 if (Scope (gnat_sub_entity) == gnat_entity
4302 && gnat_sub_entity != gnat_entity)
4303 mark_out_of_scope (gnat_sub_entity);
4305 /* Now clear this if it has been defined, but only do so if it isn't
4306 a subprogram or parameter. We could refine this, but it isn't
4307 worth it. If this is statically allocated, it is supposed to
4308 hang around out of cope. */
4309 if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity)
4310 && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind))
4312 save_gnu_tree (gnat_entity, NULL_TREE, true);
4313 save_gnu_tree (gnat_entity, error_mark_node, true);
4317 /* Set the alias set of GNU_NEW_TYPE to be that of GNU_OLD_TYPE. If this
4318 is a multi-dimensional array type, do this recursively. */
4321 copy_alias_set (tree gnu_new_type, tree gnu_old_type)
4323 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
4324 of a one-dimensional array, since the padding has the same alias set
4325 as the field type, but if it's a multi-dimensional array, we need to
4326 see the inner types. */
4327 while (TREE_CODE (gnu_old_type) == RECORD_TYPE
4328 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
4329 || TYPE_IS_PADDING_P (gnu_old_type)))
4330 gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));
4332 /* We need to be careful here in case GNU_OLD_TYPE is an unconstrained
4333 array. In that case, it doesn't have the same shape as GNU_NEW_TYPE,
4334 so we need to go down to what does. */
4335 if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE)
4337 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type))));
4339 if (TREE_CODE (gnu_new_type) == ARRAY_TYPE
4340 && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE
4341 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type)))
4342 copy_alias_set (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type));
4344 TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type);
4345 record_component_aliases (gnu_new_type);
4348 /* Return a TREE_LIST describing the substitutions needed to reflect
4349 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
4350 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
4351 of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE
4352 gives the tree for the discriminant and TREE_VALUES is the replacement
4353 value. They are in the form of operands to substitute_in_expr.
4354 DEFINITION is as in gnat_to_gnu_entity. */
4357 substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type,
4358 tree gnu_list, bool definition)
4360 Entity_Id gnat_discrim;
4364 gnat_type = Implementation_Base_Type (gnat_subtype);
4366 if (Has_Discriminants (gnat_type))
4367 for (gnat_discrim = First_Stored_Discriminant (gnat_type),
4368 gnat_value = First_Elmt (Stored_Constraint (gnat_subtype));
4369 Present (gnat_discrim);
4370 gnat_discrim = Next_Stored_Discriminant (gnat_discrim),
4371 gnat_value = Next_Elmt (gnat_value))
4372 /* Ignore access discriminants. */
4373 if (!Is_Access_Type (Etype (Node (gnat_value))))
4374 gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim),
4375 elaborate_expression
4376 (Node (gnat_value), gnat_subtype,
4377 get_entity_name (gnat_discrim), definition,
4384 /* For the following two functions: for each GNAT entity, the GCC
4385 tree node used as a dummy for that entity, if any. */
4387 static GTY((length ("max_gnat_nodes"))) tree * dummy_node_table;
4389 /* Initialize the above table. */
4392 init_dummy_type (void)
4396 dummy_node_table = (tree *) ggc_alloc (max_gnat_nodes * sizeof (tree));
4398 for (gnat_node = 0; gnat_node < max_gnat_nodes; gnat_node++)
4399 dummy_node_table[gnat_node] = NULL_TREE;
4401 dummy_node_table -= First_Node_Id;
4404 /* Make a dummy type corresponding to GNAT_TYPE. */
4407 make_dummy_type (Entity_Id gnat_type)
4409 Entity_Id gnat_underlying;
4412 /* Find a full type for GNAT_TYPE, taking into account any class wide
4414 if (Is_Class_Wide_Type (gnat_type) && Present (Equivalent_Type (gnat_type)))
4415 gnat_type = Equivalent_Type (gnat_type);
4416 else if (Ekind (gnat_type) == E_Class_Wide_Type)
4417 gnat_type = Root_Type (gnat_type);
4419 for (gnat_underlying = gnat_type;
4420 (IN (Ekind (gnat_underlying), Incomplete_Or_Private_Kind)
4421 && Present (Full_View (gnat_underlying)));
4422 gnat_underlying = Full_View (gnat_underlying))
4425 /* If it there already a dummy type, use that one. Else make one. */
4426 if (dummy_node_table[gnat_underlying])
4427 return dummy_node_table[gnat_underlying];
4429 /* If this is a record, make this a RECORD_TYPE or UNION_TYPE; else make
4431 if (Is_Unchecked_Union (gnat_underlying))
4433 gnu_type = make_node (UNION_TYPE);
4434 TYPE_UNCHECKED_UNION_P (gnu_type) = 1;
4436 else if (Is_Record_Type (gnat_underlying))
4437 gnu_type = make_node (RECORD_TYPE);
4439 gnu_type = make_node (ENUMERAL_TYPE);
4441 TYPE_NAME (gnu_type) = get_entity_name (gnat_type);
4442 TYPE_DUMMY_P (gnu_type) = 1;
4443 if (AGGREGATE_TYPE_P (gnu_type))
4444 TYPE_STUB_DECL (gnu_type) = build_decl (TYPE_DECL, NULL_TREE, gnu_type);
4446 dummy_node_table[gnat_underlying] = gnu_type;
4451 /* Return true if the size represented by GNU_SIZE can be handled by an
4452 allocation. If STATIC_P is true, consider only what can be done with a
4453 static allocation. */
4456 allocatable_size_p (tree gnu_size, bool static_p)
4458 HOST_WIDE_INT our_size;
4460 /* If this is not a static allocation, the only case we want to forbid
4461 is an overflowing size. That will be converted into a raise a
4464 return !(TREE_CODE (gnu_size) == INTEGER_CST
4465 && TREE_CONSTANT_OVERFLOW (gnu_size));
4467 /* Otherwise, we need to deal with both variable sizes and constant
4468 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
4469 since assemblers may not like very large sizes. */
4470 if (!host_integerp (gnu_size, 1))
4473 our_size = tree_low_cst (gnu_size, 1);
4474 return (int) our_size == our_size;
4477 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
4480 prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list)
4484 for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp);
4485 gnat_temp = Next_Rep_Item (gnat_temp))
4486 if (Nkind (gnat_temp) == N_Pragma)
4488 struct attrib *attr;
4489 tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE;
4490 Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp);
4491 enum attr_type etype;
4493 if (Present (gnat_assoc) && Present (First (gnat_assoc))
4494 && Present (Next (First (gnat_assoc)))
4495 && (Nkind (Expression (Next (First (gnat_assoc))))
4496 == N_String_Literal))
4498 gnu_arg0 = get_identifier (TREE_STRING_POINTER
4501 (First (gnat_assoc))))));
4502 if (Present (Next (Next (First (gnat_assoc))))
4503 && (Nkind (Expression (Next (Next (First (gnat_assoc)))))
4504 == N_String_Literal))
4505 gnu_arg1 = get_identifier (TREE_STRING_POINTER
4509 (First (gnat_assoc)))))));
4512 switch (Get_Pragma_Id (Chars (gnat_temp)))
4514 case Pragma_Machine_Attribute:
4515 etype = ATTR_MACHINE_ATTRIBUTE;
4518 case Pragma_Linker_Alias:
4519 etype = ATTR_LINK_ALIAS;
4522 case Pragma_Linker_Section:
4523 etype = ATTR_LINK_SECTION;
4526 case Pragma_Weak_External:
4527 etype = ATTR_WEAK_EXTERNAL;
4534 attr = (struct attrib *) xmalloc (sizeof (struct attrib));
4535 attr->next = *attr_list;
4537 attr->name = gnu_arg0;
4539 /* If we have an argument specified together with an attribute name,
4540 make it a single TREE_VALUE entry in a list of arguments, as GCC
4542 if (gnu_arg1 != NULL_TREE)
4543 attr->args = build_tree_list (NULL_TREE, gnu_arg1);
4545 attr->args = NULL_TREE;
4548 = Present (Next (First (gnat_assoc)))
4549 ? Expression (Next (First (gnat_assoc))) : gnat_temp;
4554 /* Get the unpadded version of a GNAT type. */
4557 get_unpadded_type (Entity_Id gnat_entity)
4559 tree type = gnat_to_gnu_type (gnat_entity);
4561 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4562 type = TREE_TYPE (TYPE_FIELDS (type));
4567 /* Called when we need to protect a variable object using a save_expr. */
4570 maybe_variable (tree gnu_operand)
4572 if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand)
4573 || TREE_CODE (gnu_operand) == SAVE_EXPR
4574 || TREE_CODE (gnu_operand) == NULL_EXPR)
4577 if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
4579 tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF,
4580 TREE_TYPE (gnu_operand),
4581 variable_size (TREE_OPERAND (gnu_operand, 0)));
4583 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
4584 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
4588 return variable_size (gnu_operand);
4591 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
4592 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
4593 return the GCC tree to use for that expression. GNU_NAME is the
4594 qualification to use if an external name is appropriate and DEFINITION is
4595 nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero,
4596 we need a result. Otherwise, we are just elaborating this for
4597 side-effects. If NEED_DEBUG is nonzero we need the symbol for debugging
4598 purposes even if it isn't needed for code generation. */
4601 elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity,
4602 tree gnu_name, bool definition, bool need_value,
4607 /* If we already elaborated this expression (e.g., it was involved
4608 in the definition of a private type), use the old value. */
4609 if (present_gnu_tree (gnat_expr))
4610 return get_gnu_tree (gnat_expr);
4612 /* If we don't need a value and this is static or a discriment, we
4613 don't need to do anything. */
4614 else if (!need_value
4615 && (Is_OK_Static_Expression (gnat_expr)
4616 || (Nkind (gnat_expr) == N_Identifier
4617 && Ekind (Entity (gnat_expr)) == E_Discriminant)))
4620 /* Otherwise, convert this tree to its GCC equivalent. */
4622 = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr),
4623 gnu_name, definition, need_debug);
4625 /* Save the expression in case we try to elaborate this entity again. Since
4626 this is not a DECL, don't check it. Don't save if it's a discriminant. */
4627 if (!CONTAINS_PLACEHOLDER_P (gnu_expr))
4628 save_gnu_tree (gnat_expr, gnu_expr, true);
4630 return need_value ? gnu_expr : error_mark_node;
4633 /* Similar, but take a GNU expression. */
4636 elaborate_expression_1 (Node_Id gnat_expr, Entity_Id gnat_entity,
4637 tree gnu_expr, tree gnu_name, bool definition,
4640 tree gnu_decl = NULL_TREE;
4641 /* Strip any conversions to see if the expression is a readonly variable.
4642 ??? This really should remain readonly, but we have to think about
4643 the typing of the tree here. */
4644 tree gnu_inner_expr = remove_conversions (gnu_expr, true);
4645 bool expr_global = Is_Public (gnat_entity) || global_bindings_p ();
4648 /* In most cases, we won't see a naked FIELD_DECL here because a
4649 discriminant reference will have been replaced with a COMPONENT_REF
4650 when the type is being elaborated. However, there are some cases
4651 involving child types where we will. So convert it to a COMPONENT_REF
4652 here. We have to hope it will be at the highest level of the
4653 expression in these cases. */
4654 if (TREE_CODE (gnu_expr) == FIELD_DECL)
4655 gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr),
4656 build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)),
4657 gnu_expr, NULL_TREE);
4659 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
4660 that is a constant, make a variable that is initialized to contain the
4661 bound when the package containing the definition is elaborated. If
4662 this entity is defined at top level and a bound or discriminant value
4663 isn't a constant or a reference to a discriminant, replace the bound
4664 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
4665 rely here on the fact that an expression cannot contain both the
4666 discriminant and some other variable. */
4668 expr_variable = (!CONSTANT_CLASS_P (gnu_expr)
4669 && !(TREE_CODE (gnu_inner_expr) == VAR_DECL
4670 && TREE_READONLY (gnu_inner_expr))
4671 && !CONTAINS_PLACEHOLDER_P (gnu_expr));
4673 /* If this is a static expression or contains a discriminant, we don't
4674 need the variable for debugging (and can't elaborate anyway if a
4677 && (Is_OK_Static_Expression (gnat_expr)
4678 || CONTAINS_PLACEHOLDER_P (gnu_expr)))
4681 /* Now create the variable if we need it. */
4682 if (need_debug || (expr_variable && expr_global))
4684 = create_var_decl (create_concat_name (gnat_entity,
4685 IDENTIFIER_POINTER (gnu_name)),
4686 NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, true,
4687 Is_Public (gnat_entity), !definition, false, NULL,
4690 /* We only need to use this variable if we are in global context since GCC
4691 can do the right thing in the local case. */
4692 if (expr_global && expr_variable)
4694 else if (!expr_variable)
4697 return maybe_variable (gnu_expr);
4700 /* Create a record type that contains a field of TYPE with a starting bit
4701 position so that it is aligned to ALIGN bits and is SIZE bytes long. */
4704 make_aligning_type (tree type, int align, tree size)
4706 tree record_type = make_node (RECORD_TYPE);
4707 tree place = build0 (PLACEHOLDER_EXPR, record_type);
4708 tree size_addr_place = convert (sizetype,
4709 build_unary_op (ADDR_EXPR, NULL_TREE,
4711 tree name = TYPE_NAME (type);
4714 if (TREE_CODE (name) == TYPE_DECL)
4715 name = DECL_NAME (name);
4717 TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN");
4719 /* The bit position is obtained by "and"ing the alignment minus 1
4720 with the two's complement of the address and multiplying
4721 by the number of bits per unit. Do all this in sizetype. */
4722 pos = size_binop (MULT_EXPR,
4723 convert (bitsizetype,
4724 size_binop (BIT_AND_EXPR,
4725 size_diffop (size_zero_node,
4727 ssize_int ((align / BITS_PER_UNIT)
4731 /* Create the field, with -1 as the 'addressable' indication to avoid the
4732 creation of a bitfield. We don't need one, it would have damaging
4733 consequences on the alignment computation, and create_field_decl would
4734 make one without this special argument, for instance because of the
4735 complex position expression. */
4736 field = create_field_decl (get_identifier ("F"), type, record_type, 1, size,
4739 finish_record_type (record_type, field, true, false);
4740 TYPE_ALIGN (record_type) = BIGGEST_ALIGNMENT;
4741 TYPE_SIZE (record_type)
4742 = size_binop (PLUS_EXPR,
4743 size_binop (MULT_EXPR, convert (bitsizetype, size),
4745 bitsize_int (align));
4746 TYPE_SIZE_UNIT (record_type)
4747 = size_binop (PLUS_EXPR, size, size_int (align / BITS_PER_UNIT));
4748 copy_alias_set (record_type, type);
4752 /* TYPE is a RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE, with BLKmode that's
4753 being used as the field type of a packed record. See if we can rewrite it
4754 as a record that has a non-BLKmode type, which we can pack tighter. If so,
4755 return the new type. If not, return the original type. */
4758 make_packable_type (tree type)
4760 tree new_type = make_node (TREE_CODE (type));
4761 tree field_list = NULL_TREE;
4764 /* Copy the name and flags from the old type to that of the new and set
4765 the alignment to try for an integral type. For QUAL_UNION_TYPE,
4766 also copy the size. */
4767 TYPE_NAME (new_type) = TYPE_NAME (type);
4768 TYPE_JUSTIFIED_MODULAR_P (new_type)
4769 = TYPE_JUSTIFIED_MODULAR_P (type);
4770 TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
4772 if (TREE_CODE (type) == RECORD_TYPE)
4773 TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type);
4774 else if (TREE_CODE (type) == QUAL_UNION_TYPE)
4776 TYPE_SIZE (new_type) = TYPE_SIZE (type);
4777 TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
4780 TYPE_ALIGN (new_type)
4781 = ((HOST_WIDE_INT) 1
4782 << (floor_log2 (tree_low_cst (TYPE_SIZE (type), 1) - 1) + 1));
4784 /* Now copy the fields, keeping the position and size. */
4785 for (old_field = TYPE_FIELDS (type); old_field;
4786 old_field = TREE_CHAIN (old_field))
4788 tree new_field_type = TREE_TYPE (old_field);
4791 if (TYPE_MODE (new_field_type) == BLKmode
4792 && (TREE_CODE (new_field_type) == RECORD_TYPE
4793 || TREE_CODE (new_field_type) == UNION_TYPE
4794 || TREE_CODE (new_field_type) == QUAL_UNION_TYPE)
4795 && host_integerp (TYPE_SIZE (new_field_type), 1))
4796 new_field_type = make_packable_type (new_field_type);
4798 new_field = create_field_decl (DECL_NAME (old_field), new_field_type,
4799 new_type, TYPE_PACKED (type),
4800 DECL_SIZE (old_field),
4801 bit_position (old_field),
4802 !DECL_NONADDRESSABLE_P (old_field));
4804 DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
4805 SET_DECL_ORIGINAL_FIELD
4806 (new_field, (DECL_ORIGINAL_FIELD (old_field)
4807 ? DECL_ORIGINAL_FIELD (old_field) : old_field));
4809 if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
4810 DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
4812 TREE_CHAIN (new_field) = field_list;
4813 field_list = new_field;
4816 finish_record_type (new_type, nreverse (field_list), true, true);
4817 copy_alias_set (new_type, type);
4818 return TYPE_MODE (new_type) == BLKmode ? type : new_type;
4821 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
4822 if needed. We have already verified that SIZE and TYPE are large enough.
4824 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
4827 IS_USER_TYPE is true if we must be sure we complete the original type.
4829 DEFINITION is true if this type is being defined.
4831 SAME_RM_SIZE is true if the RM_Size of the resulting type is to be
4832 set to its TYPE_SIZE; otherwise, it's set to the RM_Size of the original
4836 maybe_pad_type (tree type, tree size, unsigned int align,
4837 Entity_Id gnat_entity, const char *name_trailer,
4838 bool is_user_type, bool definition, bool same_rm_size)
4840 tree orig_size = TYPE_SIZE (type);
4844 /* If TYPE is a padded type, see if it agrees with any size and alignment
4845 we were given. If so, return the original type. Otherwise, strip
4846 off the padding, since we will either be returning the inner type
4847 or repadding it. If no size or alignment is specified, use that of
4848 the original padded type. */
4850 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
4853 || operand_equal_p (round_up (size,
4854 MAX (align, TYPE_ALIGN (type))),
4855 round_up (TYPE_SIZE (type),
4856 MAX (align, TYPE_ALIGN (type))),
4858 && (align == 0 || align == TYPE_ALIGN (type)))
4862 size = TYPE_SIZE (type);
4864 align = TYPE_ALIGN (type);
4866 type = TREE_TYPE (TYPE_FIELDS (type));
4867 orig_size = TYPE_SIZE (type);
4870 /* If the size is either not being changed or is being made smaller (which
4871 is not done here (and is only valid for bitfields anyway), show the size
4872 isn't changing. Likewise, clear the alignment if it isn't being
4873 changed. Then return if we aren't doing anything. */
4876 && (operand_equal_p (size, orig_size, 0)
4877 || (TREE_CODE (orig_size) == INTEGER_CST
4878 && tree_int_cst_lt (size, orig_size))))
4881 if (align == TYPE_ALIGN (type))
4884 if (align == 0 && !size)
4887 /* We used to modify the record in place in some cases, but that could
4888 generate incorrect debugging information. So make a new record
4890 record = make_node (RECORD_TYPE);
4892 if (Present (gnat_entity))
4893 TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer);
4895 /* If we were making a type, complete the original type and give it a
4898 create_type_decl (get_entity_name (gnat_entity), type,
4899 NULL, !Comes_From_Source (gnat_entity),
4901 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
4902 && DECL_IGNORED_P (TYPE_NAME (type))),
4905 /* If we are changing the alignment and the input type is a record with
4906 BLKmode and a small constant size, try to make a form that has an
4907 integral mode. That might allow this record to have an integral mode,
4908 which will be much more efficient. There is no point in doing this if a
4909 size is specified unless it is also smaller than the biggest alignment
4910 and it is incorrect to do this if the size of the original type is not a
4911 multiple of the alignment. */
4913 && TREE_CODE (type) == RECORD_TYPE
4914 && TYPE_MODE (type) == BLKmode
4915 && host_integerp (orig_size, 1)
4916 && compare_tree_int (orig_size, BIGGEST_ALIGNMENT) <= 0
4918 || (TREE_CODE (size) == INTEGER_CST
4919 && compare_tree_int (size, BIGGEST_ALIGNMENT) <= 0))
4920 && tree_low_cst (orig_size, 1) % align == 0)
4921 type = make_packable_type (type);
4923 field = create_field_decl (get_identifier ("F"), type, record, 0,
4924 NULL_TREE, bitsize_zero_node, 1);
4926 DECL_INTERNAL_P (field) = 1;
4927 TYPE_SIZE (record) = size ? size : orig_size;
4928 TYPE_SIZE_UNIT (record)
4929 = (size ? convert (sizetype,
4930 size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node))
4931 : TYPE_SIZE_UNIT (type));
4933 TYPE_ALIGN (record) = align;
4934 TYPE_IS_PADDING_P (record) = 1;
4935 TYPE_VOLATILE (record)
4936 = Present (gnat_entity) && Treat_As_Volatile (gnat_entity);
4937 finish_record_type (record, field, true, false);
4939 /* Keep the RM_Size of the padded record as that of the old record
4941 SET_TYPE_ADA_SIZE (record, same_rm_size ? size : rm_size (type));
4943 /* Unless debugging information isn't being written for the input type,
4944 write a record that shows what we are a subtype of and also make a
4945 variable that indicates our size, if variable. */
4946 if (TYPE_NAME (record) && AGGREGATE_TYPE_P (type)
4947 && (TREE_CODE (TYPE_NAME (type)) != TYPE_DECL
4948 || !DECL_IGNORED_P (TYPE_NAME (type))))
4950 tree marker = make_node (RECORD_TYPE);
4951 tree name = (TREE_CODE (TYPE_NAME (record)) == TYPE_DECL
4952 ? DECL_NAME (TYPE_NAME (record))
4953 : TYPE_NAME (record));
4954 tree orig_name = TYPE_NAME (type);
4956 if (TREE_CODE (orig_name) == TYPE_DECL)
4957 orig_name = DECL_NAME (orig_name);
4959 TYPE_NAME (marker) = concat_id_with_name (name, "XVS");
4960 finish_record_type (marker,
4961 create_field_decl (orig_name, integer_type_node,
4962 marker, 0, NULL_TREE, NULL_TREE,
4966 if (size && TREE_CODE (size) != INTEGER_CST && definition)
4967 create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE,
4968 sizetype, TYPE_SIZE (record), false, false, false,
4969 false, NULL, gnat_entity);
4974 if (CONTAINS_PLACEHOLDER_P (orig_size))
4975 orig_size = max_size (orig_size, true);
4977 /* If the size was widened explicitly, maybe give a warning. */
4978 if (size && Present (gnat_entity)
4979 && !operand_equal_p (size, orig_size, 0)
4980 && !(TREE_CODE (size) == INTEGER_CST
4981 && TREE_CODE (orig_size) == INTEGER_CST
4982 && tree_int_cst_lt (size, orig_size)))
4984 Node_Id gnat_error_node = Empty;
4986 if (Is_Packed_Array_Type (gnat_entity))
4987 gnat_entity = Associated_Node_For_Itype (gnat_entity);
4989 if ((Ekind (gnat_entity) == E_Component
4990 || Ekind (gnat_entity) == E_Discriminant)
4991 && Present (Component_Clause (gnat_entity)))
4992 gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
4993 else if (Present (Size_Clause (gnat_entity)))
4994 gnat_error_node = Expression (Size_Clause (gnat_entity));
4996 /* Generate message only for entities that come from source, since
4997 if we have an entity created by expansion, the message will be
4998 generated for some other corresponding source entity. */
4999 if (Comes_From_Source (gnat_entity) && Present (gnat_error_node))
5000 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node,
5002 size_diffop (size, orig_size));
5004 else if (*name_trailer == 'C' && !Is_Internal (gnat_entity))
5005 post_error_ne_tree ("component of& padded{ by ^ bits}?",
5006 gnat_entity, gnat_entity,
5007 size_diffop (size, orig_size));
5013 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
5014 the value passed against the list of choices. */
5017 choices_to_gnu (tree operand, Node_Id choices)
5021 tree result = integer_zero_node;
5022 tree this_test, low = 0, high = 0, single = 0;
5024 for (choice = First (choices); Present (choice); choice = Next (choice))
5026 switch (Nkind (choice))
5029 low = gnat_to_gnu (Low_Bound (choice));
5030 high = gnat_to_gnu (High_Bound (choice));
5032 /* There's no good type to use here, so we might as well use
5033 integer_type_node. */
5035 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
5036 build_binary_op (GE_EXPR, integer_type_node,
5038 build_binary_op (LE_EXPR, integer_type_node,
5043 case N_Subtype_Indication:
5044 gnat_temp = Range_Expression (Constraint (choice));
5045 low = gnat_to_gnu (Low_Bound (gnat_temp));
5046 high = gnat_to_gnu (High_Bound (gnat_temp));
5049 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
5050 build_binary_op (GE_EXPR, integer_type_node,
5052 build_binary_op (LE_EXPR, integer_type_node,
5057 case N_Expanded_Name:
5058 /* This represents either a subtype range, an enumeration
5059 literal, or a constant Ekind says which. If an enumeration
5060 literal or constant, fall through to the next case. */
5061 if (Ekind (Entity (choice)) != E_Enumeration_Literal
5062 && Ekind (Entity (choice)) != E_Constant)
5064 tree type = gnat_to_gnu_type (Entity (choice));
5066 low = TYPE_MIN_VALUE (type);
5067 high = TYPE_MAX_VALUE (type);
5070 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
5071 build_binary_op (GE_EXPR, integer_type_node,
5073 build_binary_op (LE_EXPR, integer_type_node,
5077 /* ... fall through ... */
5078 case N_Character_Literal:
5079 case N_Integer_Literal:
5080 single = gnat_to_gnu (choice);
5081 this_test = build_binary_op (EQ_EXPR, integer_type_node, operand,
5085 case N_Others_Choice:
5086 this_test = integer_one_node;
5093 result = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5100 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
5101 placed in GNU_RECORD_TYPE.
5103 PACKED is 1 if the enclosing record is packed and -1 if the enclosing
5104 record has a Component_Alignment of Storage_Unit.
5106 DEFINITION is true if this field is for a record being defined. */
5109 gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
5112 tree gnu_field_id = get_entity_name (gnat_field);
5113 tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field));
5114 tree gnu_orig_field_type = gnu_field_type;
5118 bool needs_strict_alignment
5119 = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field))
5120 || Treat_As_Volatile (gnat_field));
5122 /* If this field requires strict alignment or contains an item of
5123 variable sized, pretend it isn't packed. */
5124 if (needs_strict_alignment || is_variable_size (gnu_field_type))
5127 /* For packed records, this is one of the few occasions on which we use
5128 the official RM size for discrete or fixed-point components, instead
5129 of the normal GNAT size stored in Esize. See description in Einfo:
5130 "Handling of Type'Size Values" for further details. */
5133 gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type,
5134 gnat_field, FIELD_DECL, false, true);
5136 if (Known_Static_Esize (gnat_field))
5137 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
5138 gnat_field, FIELD_DECL, false, true);
5140 /* If we are packing this record, have a specified size that's smaller than
5141 that of the field type, or a position is specified, and the field type
5142 is also a record that's BLKmode and with a small constant size, see if
5143 we can get a better form of the type that allows more packing. If we
5144 can, show a size was specified for it if there wasn't one so we know to
5145 make this a bitfield and avoid making things wider. */
5146 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5147 && TYPE_MODE (gnu_field_type) == BLKmode
5148 && host_integerp (TYPE_SIZE (gnu_field_type), 1)
5149 && compare_tree_int (TYPE_SIZE (gnu_field_type), BIGGEST_ALIGNMENT) <= 0
5151 || (gnu_size && tree_int_cst_lt (gnu_size,
5152 TYPE_SIZE (gnu_field_type)))
5153 || Present (Component_Clause (gnat_field))))
5155 gnu_field_type = make_packable_type (gnu_field_type);
5157 if (gnu_field_type != gnu_orig_field_type && !gnu_size)
5158 gnu_size = rm_size (gnu_field_type);
5161 /* If we are packing the record and the field is BLKmode, round the
5162 size up to a byte boundary. */
5163 if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size)
5164 gnu_size = round_up (gnu_size, BITS_PER_UNIT);
5166 if (Present (Component_Clause (gnat_field)))
5168 gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype);
5169 gnu_size = validate_size (Esize (gnat_field), gnu_field_type,
5170 gnat_field, FIELD_DECL, false, true);
5172 /* Ensure the position does not overlap with the parent subtype,
5174 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field)))))
5177 = gnat_to_gnu_type (Parent_Subtype
5178 (Underlying_Type (Scope (gnat_field))));
5180 if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST
5181 && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent)))
5184 ("offset of& must be beyond parent{, minimum allowed is ^}",
5185 First_Bit (Component_Clause (gnat_field)), gnat_field,
5186 TYPE_SIZE_UNIT (gnu_parent));
5190 /* If this field needs strict alignment, ensure the record is
5191 sufficiently aligned and that that position and size are
5192 consistent with the alignment. */
5193 if (needs_strict_alignment)
5195 tree gnu_rounded_size = round_up (rm_size (gnu_field_type),
5196 TYPE_ALIGN (gnu_field_type));
5198 TYPE_ALIGN (gnu_record_type)
5199 = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type));
5201 /* If Atomic, the size must match exactly that of the field. */
5202 if ((Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field)))
5203 && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0))
5206 ("atomic field& must be natural size of type{ (^)}",
5207 Last_Bit (Component_Clause (gnat_field)), gnat_field,
5208 TYPE_SIZE (gnu_field_type));
5210 gnu_size = NULL_TREE;
5213 /* If Aliased, the size must match exactly the rounded size. We
5214 used to be more accommodating here and accept greater sizes, but
5215 fully supporting this case on big-endian platforms would require
5216 switching to a more involved layout for the field. */
5217 else if (Is_Aliased (gnat_field)
5219 && ! operand_equal_p (gnu_size, gnu_rounded_size, 0))
5222 ("size of aliased field& must be ^ bits",
5223 Last_Bit (Component_Clause (gnat_field)), gnat_field,
5225 gnu_size = NULL_TREE;
5228 if (!integer_zerop (size_binop
5229 (TRUNC_MOD_EXPR, gnu_pos,
5230 bitsize_int (TYPE_ALIGN (gnu_field_type)))))
5232 if (Is_Aliased (gnat_field))
5234 ("position of aliased field& must be multiple of ^ bits",
5235 First_Bit (Component_Clause (gnat_field)), gnat_field,
5236 TYPE_ALIGN (gnu_field_type));
5238 else if (Treat_As_Volatile (gnat_field))
5240 ("position of volatile field& must be multiple of ^ bits",
5241 First_Bit (Component_Clause (gnat_field)), gnat_field,
5242 TYPE_ALIGN (gnu_field_type));
5244 else if (Strict_Alignment (Etype (gnat_field)))
5246 ("position of & with aliased or tagged components not multiple of ^ bits",
5247 First_Bit (Component_Clause (gnat_field)), gnat_field,
5248 TYPE_ALIGN (gnu_field_type));
5252 gnu_pos = NULL_TREE;
5256 if (Is_Atomic (gnat_field))
5257 check_ok_for_atomic (gnu_field_type, gnat_field, false);
5260 /* If the record has rep clauses and this is the tag field, make a rep
5261 clause for it as well. */
5262 else if (Has_Specified_Layout (Scope (gnat_field))
5263 && Chars (gnat_field) == Name_uTag)
5265 gnu_pos = bitsize_zero_node;
5266 gnu_size = TYPE_SIZE (gnu_field_type);
5269 /* We need to make the size the maximum for the type if it is
5270 self-referential and an unconstrained type. In that case, we can't
5271 pack the field since we can't make a copy to align it. */
5272 if (TREE_CODE (gnu_field_type) == RECORD_TYPE
5274 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type))
5275 && !Is_Constrained (Underlying_Type (Etype (gnat_field))))
5277 gnu_size = max_size (TYPE_SIZE (gnu_field_type), true);
5281 /* If no size is specified (or if there was an error), don't specify a
5284 gnu_pos = NULL_TREE;
5287 /* If the field's type is justified modular, we would need to remove
5288 the wrapper to (better) meet the layout requirements. However we
5289 can do so only if the field is not aliased to preserve the unique
5290 layout and if the prescribed size is not greater than that of the
5291 packed array to preserve the justification. */
5292 if (!needs_strict_alignment
5293 && TREE_CODE (gnu_field_type) == RECORD_TYPE
5294 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type)
5295 && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type))
5297 gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type));
5300 = make_type_from_size (gnu_field_type, gnu_size,
5301 Has_Biased_Representation (gnat_field));
5302 gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field,
5303 "PAD", false, definition, true);
5306 gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE
5307 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type));
5309 /* Now create the decl for the field. */
5310 gnu_field = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type,
5311 packed, gnu_size, gnu_pos,
5312 Is_Aliased (gnat_field));
5313 Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field));
5314 TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field);
5316 if (Ekind (gnat_field) == E_Discriminant)
5317 DECL_DISCRIMINANT_NUMBER (gnu_field)
5318 = UI_To_gnu (Discriminant_Number (gnat_field), sizetype);
5323 /* Return true if TYPE is a type with variable size, a padding type with a
5324 field of variable size or is a record that has a field such a field. */
5327 is_variable_size (tree type)
5331 /* We need not be concerned about this at all if we don't have
5332 strict alignment. */
5333 if (!STRICT_ALIGNMENT)
5335 else if (!TREE_CONSTANT (TYPE_SIZE (type)))
5337 else if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)
5338 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type))))
5340 else if (TREE_CODE (type) != RECORD_TYPE
5341 && TREE_CODE (type) != UNION_TYPE
5342 && TREE_CODE (type) != QUAL_UNION_TYPE)
5345 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
5346 if (is_variable_size (TREE_TYPE (field)))
5352 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
5353 of GCC trees for fields that are in the record and have already been
5354 processed. When called from gnat_to_gnu_entity during the processing of a
5355 record type definition, the GCC nodes for the discriminants will be on
5356 the chain. The other calls to this function are recursive calls from
5357 itself for the Component_List of a variant and the chain is empty.
5359 PACKED is 1 if this is for a record with "pragma pack" and -1 is this is
5360 for a record type with "pragma component_alignment (storage_unit)".
5362 DEFINITION is true if we are defining this record.
5364 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
5365 with a rep clause is to be added. If it is nonzero, that is all that
5366 should be done with such fields.
5368 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
5369 laying out the record. This means the alignment only serves to force fields
5370 to be bitfields, but not require the record to be that aligned. This is
5373 ALL_REP, if true, means a rep clause was found for all the fields. This
5374 simplifies the logic since we know we're not in the mixed case.
5376 DEFER_DEBUG, if true, means that the debugging routines should not be
5377 called when finishing constructing the record type.
5379 The processing of the component list fills in the chain with all of the
5380 fields of the record and then the record type is finished. */
5383 components_to_record (tree gnu_record_type, Node_Id component_list,
5384 tree gnu_field_list, int packed, bool definition,
5385 tree *p_gnu_rep_list, bool cancel_alignment,
5386 bool all_rep, bool defer_debug)
5388 Node_Id component_decl;
5389 Entity_Id gnat_field;
5390 Node_Id variant_part;
5392 tree gnu_our_rep_list = NULL_TREE;
5393 tree gnu_field, gnu_last;
5394 bool layout_with_rep = false;
5395 bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
5397 /* For each variable within each component declaration create a GCC field
5398 and add it to the list, skipping any pragmas in the list. */
5400 if (Present (Component_Items (component_list)))
5401 for (component_decl = First_Non_Pragma (Component_Items (component_list));
5402 Present (component_decl);
5403 component_decl = Next_Non_Pragma (component_decl))
5405 gnat_field = Defining_Entity (component_decl);
5407 if (Chars (gnat_field) == Name_uParent)
5408 gnu_field = tree_last (TYPE_FIELDS (gnu_record_type));
5411 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type,
5412 packed, definition);
5414 /* If this is the _Tag field, put it before any discriminants,
5415 instead of after them as is the case for all other fields.
5416 Ignore field of void type if only annotating. */
5417 if (Chars (gnat_field) == Name_uTag)
5418 gnu_field_list = chainon (gnu_field_list, gnu_field);
5421 TREE_CHAIN (gnu_field) = gnu_field_list;
5422 gnu_field_list = gnu_field;
5426 save_gnu_tree (gnat_field, gnu_field, false);
5429 /* At the end of the component list there may be a variant part. */
5430 variant_part = Variant_Part (component_list);
5432 /* If this is an unchecked union, each variant must have exactly one
5433 component, each of which becomes one component of this union. */
5434 if (TREE_CODE (gnu_record_type) == UNION_TYPE
5435 && TYPE_UNCHECKED_UNION_P (gnu_record_type)
5436 && Present (variant_part))
5437 for (variant = First_Non_Pragma (Variants (variant_part));
5439 variant = Next_Non_Pragma (variant))
5442 = First_Non_Pragma (Component_Items (Component_List (variant)));
5443 gnat_field = Defining_Entity (component_decl);
5444 gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed,
5446 TREE_CHAIN (gnu_field) = gnu_field_list;
5447 gnu_field_list = gnu_field;
5448 save_gnu_tree (gnat_field, gnu_field, false);
5451 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
5452 mutually exclusive and should go in the same memory. To do this we need
5453 to treat each variant as a record whose elements are created from the
5454 component list for the variant. So here we create the records from the
5455 lists for the variants and put them all into the QUAL_UNION_TYPE. */
5456 else if (Present (variant_part))
5458 tree gnu_discriminant = gnat_to_gnu (Name (variant_part));
5460 tree gnu_union_type = make_node (QUAL_UNION_TYPE);
5461 tree gnu_union_field;
5462 tree gnu_variant_list = NULL_TREE;
5463 tree gnu_name = TYPE_NAME (gnu_record_type);
5465 = concat_id_with_name
5466 (get_identifier (Get_Name_String (Chars (Name (variant_part)))),
5469 if (TREE_CODE (gnu_name) == TYPE_DECL)
5470 gnu_name = DECL_NAME (gnu_name);
5472 TYPE_NAME (gnu_union_type)
5473 = concat_id_with_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name));
5474 TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type);
5476 for (variant = First_Non_Pragma (Variants (variant_part));
5478 variant = Next_Non_Pragma (variant))
5480 tree gnu_variant_type = make_node (RECORD_TYPE);
5481 tree gnu_inner_name;
5484 Get_Variant_Encoding (variant);
5485 gnu_inner_name = get_identifier (Name_Buffer);
5486 TYPE_NAME (gnu_variant_type)
5487 = concat_id_with_name (TYPE_NAME (gnu_union_type),
5488 IDENTIFIER_POINTER (gnu_inner_name));
5490 /* Set the alignment of the inner type in case we need to make
5491 inner objects into bitfields, but then clear it out
5492 so the record actually gets only the alignment required. */
5493 TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type);
5494 TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type);
5496 /* Similarly, if the outer record has a size specified and all fields
5497 have record rep clauses, we can propagate the size into the
5499 if (all_rep_and_size)
5501 TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type);
5502 TYPE_SIZE_UNIT (gnu_variant_type)
5503 = TYPE_SIZE_UNIT (gnu_record_type);
5506 components_to_record (gnu_variant_type, Component_List (variant),
5507 NULL_TREE, packed, definition,
5508 &gnu_our_rep_list, !all_rep_and_size, all_rep,
5511 gnu_qual = choices_to_gnu (gnu_discriminant,
5512 Discrete_Choices (variant));
5514 Set_Present_Expr (variant, annotate_value (gnu_qual));
5515 gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type,
5518 ? TYPE_SIZE (gnu_record_type) : 0),
5520 ? bitsize_zero_node : 0),
5523 DECL_INTERNAL_P (gnu_field) = 1;
5524 DECL_QUALIFIER (gnu_field) = gnu_qual;
5525 TREE_CHAIN (gnu_field) = gnu_variant_list;
5526 gnu_variant_list = gnu_field;
5529 /* We use to delete the empty variants from the end. However,
5530 we no longer do that because we need them to generate complete
5531 debugging information for the variant record. Otherwise,
5532 the union type definition will be missing the fields associated
5533 to these empty variants. */
5535 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
5536 if (gnu_variant_list)
5538 if (all_rep_and_size)
5540 TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type);
5541 TYPE_SIZE_UNIT (gnu_union_type)
5542 = TYPE_SIZE_UNIT (gnu_record_type);
5545 finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
5546 all_rep_and_size, false);
5549 = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type,
5551 all_rep ? TYPE_SIZE (gnu_union_type) : 0,
5552 all_rep ? bitsize_zero_node : 0, 0);
5554 DECL_INTERNAL_P (gnu_union_field) = 1;
5555 TREE_CHAIN (gnu_union_field) = gnu_field_list;
5556 gnu_field_list = gnu_union_field;
5560 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
5561 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
5562 in a separate pass since we want to handle the discriminants but can't
5563 play with them until we've used them in debugging data above.
5565 ??? Note: if we then reorder them, debugging information will be wrong,
5566 but there's nothing that can be done about this at the moment. */
5568 for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; )
5570 if (DECL_FIELD_OFFSET (gnu_field))
5572 tree gnu_next = TREE_CHAIN (gnu_field);
5575 gnu_field_list = gnu_next;
5577 TREE_CHAIN (gnu_last) = gnu_next;
5579 TREE_CHAIN (gnu_field) = gnu_our_rep_list;
5580 gnu_our_rep_list = gnu_field;
5581 gnu_field = gnu_next;
5585 gnu_last = gnu_field;
5586 gnu_field = TREE_CHAIN (gnu_field);
5590 /* If we have any items in our rep'ed field list, it is not the case that all
5591 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
5592 set it and ignore the items. Otherwise, sort the fields by bit position
5593 and put them into their own record if we have any fields without
5595 if (gnu_our_rep_list && p_gnu_rep_list && !all_rep)
5596 *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list);
5597 else if (gnu_our_rep_list)
5600 = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type);
5601 int len = list_length (gnu_our_rep_list);
5602 tree *gnu_arr = (tree *) alloca (sizeof (tree) * len);
5605 /* Set DECL_SECTION_NAME to increasing integers so we have a
5607 for (i = 0, gnu_field = gnu_our_rep_list; gnu_field;
5608 gnu_field = TREE_CHAIN (gnu_field), i++)
5610 gnu_arr[i] = gnu_field;
5611 DECL_SECTION_NAME (gnu_field) = size_int (i);
5614 qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos);
5616 /* Put the fields in the list in order of increasing position, which
5617 means we start from the end. */
5618 gnu_our_rep_list = NULL_TREE;
5619 for (i = len - 1; i >= 0; i--)
5621 TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list;
5622 gnu_our_rep_list = gnu_arr[i];
5623 DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type;
5624 DECL_SECTION_NAME (gnu_arr[i]) = NULL_TREE;
5629 finish_record_type (gnu_rep_type, gnu_our_rep_list, true, false);
5630 gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type,
5631 gnu_record_type, 0, 0, 0, 1);
5632 DECL_INTERNAL_P (gnu_field) = 1;
5633 gnu_field_list = chainon (gnu_field_list, gnu_field);
5637 layout_with_rep = true;
5638 gnu_field_list = nreverse (gnu_our_rep_list);
5642 if (cancel_alignment)
5643 TYPE_ALIGN (gnu_record_type) = 0;
5645 finish_record_type (gnu_record_type, nreverse (gnu_field_list),
5646 layout_with_rep, defer_debug);
5649 /* Called via qsort from the above. Returns -1, 1, depending on the
5650 bit positions and ordinals of the two fields. */
5653 compare_field_bitpos (const PTR rt1, const PTR rt2)
5655 tree *t1 = (tree *) rt1;
5656 tree *t2 = (tree *) rt2;
5658 if (tree_int_cst_equal (bit_position (*t1), bit_position (*t2)))
5660 (tree_int_cst_lt (DECL_SECTION_NAME (*t1), DECL_SECTION_NAME (*t2))
5662 else if (tree_int_cst_lt (bit_position (*t1), bit_position (*t2)))
5668 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
5669 placed into an Esize, Component_Bit_Offset, or Component_Size value
5670 in the GNAT tree. */
5673 annotate_value (tree gnu_size)
5675 int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size));
5677 Node_Ref_Or_Val ops[3], ret;
5681 /* If back annotation is suppressed by the front end, return No_Uint */
5682 if (!Back_Annotate_Rep_Info)
5685 /* See if we've already saved the value for this node. */
5686 if (EXPR_P (gnu_size) && TREE_COMPLEXITY (gnu_size))
5687 return (Node_Ref_Or_Val) TREE_COMPLEXITY (gnu_size);
5689 /* If we do not return inside this switch, TCODE will be set to the
5690 code to use for a Create_Node operand and LEN (set above) will be
5691 the number of recursive calls for us to make. */
5693 switch (TREE_CODE (gnu_size))
5696 if (TREE_OVERFLOW (gnu_size))
5699 /* This may have come from a conversion from some smaller type,
5700 so ensure this is in bitsizetype. */
5701 gnu_size = convert (bitsizetype, gnu_size);
5703 /* For negative values, use NEGATE_EXPR of the supplied value. */
5704 if (tree_int_cst_sgn (gnu_size) < 0)
5706 /* The ridiculous code below is to handle the case of the largest
5707 negative integer. */
5708 tree negative_size = size_diffop (bitsize_zero_node, gnu_size);
5709 bool adjust = false;
5712 if (TREE_CONSTANT_OVERFLOW (negative_size))
5715 = size_binop (MINUS_EXPR, bitsize_zero_node,
5716 size_binop (PLUS_EXPR, gnu_size,
5721 temp = build1 (NEGATE_EXPR, bitsizetype, negative_size);
5723 temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node);
5725 return annotate_value (temp);
5728 if (!host_integerp (gnu_size, 1))
5731 size = tree_low_cst (gnu_size, 1);
5733 /* This peculiar test is to make sure that the size fits in an int
5734 on machines where HOST_WIDE_INT is not "int". */
5735 if (tree_low_cst (gnu_size, 1) == size)
5736 return UI_From_Int (size);
5741 /* The only case we handle here is a simple discriminant reference. */
5742 if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR
5743 && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL
5744 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)))
5745 return Create_Node (Discrim_Val,
5746 annotate_value (DECL_DISCRIMINANT_NUMBER
5747 (TREE_OPERAND (gnu_size, 1))),
5752 case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
5753 return annotate_value (TREE_OPERAND (gnu_size, 0));
5755 /* Now just list the operations we handle. */
5756 case COND_EXPR: tcode = Cond_Expr; break;
5757 case PLUS_EXPR: tcode = Plus_Expr; break;
5758 case MINUS_EXPR: tcode = Minus_Expr; break;
5759 case MULT_EXPR: tcode = Mult_Expr; break;
5760 case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break;
5761 case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break;
5762 case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break;
5763 case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break;
5764 case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break;
5765 case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break;
5766 case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break;
5767 case NEGATE_EXPR: tcode = Negate_Expr; break;
5768 case MIN_EXPR: tcode = Min_Expr; break;
5769 case MAX_EXPR: tcode = Max_Expr; break;
5770 case ABS_EXPR: tcode = Abs_Expr; break;
5771 case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break;
5772 case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break;
5773 case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break;
5774 case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break;
5775 case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break;
5776 case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break;
5777 case LT_EXPR: tcode = Lt_Expr; break;
5778 case LE_EXPR: tcode = Le_Expr; break;
5779 case GT_EXPR: tcode = Gt_Expr; break;
5780 case GE_EXPR: tcode = Ge_Expr; break;
5781 case EQ_EXPR: tcode = Eq_Expr; break;
5782 case NE_EXPR: tcode = Ne_Expr; break;
5788 /* Now get each of the operands that's relevant for this code. If any
5789 cannot be expressed as a repinfo node, say we can't. */
5790 for (i = 0; i < 3; i++)
5793 for (i = 0; i < len; i++)
5795 ops[i] = annotate_value (TREE_OPERAND (gnu_size, i));
5796 if (ops[i] == No_Uint)
5800 ret = Create_Node (tcode, ops[0], ops[1], ops[2]);
5801 TREE_COMPLEXITY (gnu_size) = ret;
5805 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
5806 GCC type, set Component_Bit_Offset and Esize to the position and size
5810 annotate_rep (Entity_Id gnat_entity, tree gnu_type)
5814 Entity_Id gnat_field;
5816 /* We operate by first making a list of all fields and their positions
5817 (we can get the sizes easily at any time) by a recursive call
5818 and then update all the sizes into the tree. */
5819 gnu_list = compute_field_positions (gnu_type, NULL_TREE,
5820 size_zero_node, bitsize_zero_node,
5823 for (gnat_field = First_Entity (gnat_entity); Present (gnat_field);
5824 gnat_field = Next_Entity (gnat_field))
5825 if ((Ekind (gnat_field) == E_Component
5826 || (Ekind (gnat_field) == E_Discriminant
5827 && !Is_Unchecked_Union (Scope (gnat_field)))))
5829 tree parent_offset = bitsize_zero_node;
5831 gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field),
5836 if (type_annotate_only && Is_Tagged_Type (gnat_entity))
5838 /* In this mode the tag and parent components have not been
5839 generated, so we add the appropriate offset to each
5840 component. For a component appearing in the current
5841 extension, the offset is the size of the parent. */
5842 if (Is_Derived_Type (gnat_entity)
5843 && Original_Record_Component (gnat_field) == gnat_field)
5845 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))),
5848 parent_offset = bitsize_int (POINTER_SIZE);
5851 Set_Component_Bit_Offset
5854 (size_binop (PLUS_EXPR,
5855 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)),
5856 TREE_VALUE (TREE_VALUE
5857 (TREE_VALUE (gnu_entry)))),
5860 Set_Esize (gnat_field,
5861 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry))));
5863 else if (type_annotate_only
5864 && Is_Tagged_Type (gnat_entity)
5865 && Is_Derived_Type (gnat_entity))
5867 /* If there is no gnu_entry, this is an inherited component whose
5868 position is the same as in the parent type. */
5869 Set_Component_Bit_Offset
5871 Component_Bit_Offset (Original_Record_Component (gnat_field)));
5872 Set_Esize (gnat_field,
5873 Esize (Original_Record_Component (gnat_field)));
5878 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
5879 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
5880 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
5881 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
5882 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
5883 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
5887 compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos,
5888 tree gnu_bitpos, unsigned int offset_align)
5891 tree gnu_result = gnu_list;
5893 for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field;
5894 gnu_field = TREE_CHAIN (gnu_field))
5896 tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos,
5897 DECL_FIELD_BIT_OFFSET (gnu_field));
5898 tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos,
5899 DECL_FIELD_OFFSET (gnu_field));
5900 unsigned int our_offset_align
5901 = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field));
5904 = tree_cons (gnu_field,
5905 tree_cons (gnu_our_offset,
5906 tree_cons (size_int (our_offset_align),
5907 gnu_our_bitpos, NULL_TREE),
5911 if (DECL_INTERNAL_P (gnu_field))
5913 = compute_field_positions (TREE_TYPE (gnu_field), gnu_result,
5914 gnu_our_offset, gnu_our_bitpos,
5921 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
5922 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
5923 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
5924 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
5925 for the size of a field. COMPONENT_P is true if we are being called
5926 to process the Component_Size of GNAT_OBJECT. This is used for error
5927 message handling and to indicate to use the object size of GNU_TYPE.
5928 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
5929 it means that a size of zero should be treated as an unspecified size. */
5932 validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
5933 enum tree_code kind, bool component_p, bool zero_ok)
5935 Node_Id gnat_error_node;
5937 = kind == VAR_DECL ? TYPE_SIZE (gnu_type) : rm_size (gnu_type);
5940 /* Find the node to use for errors. */
5941 if ((Ekind (gnat_object) == E_Component
5942 || Ekind (gnat_object) == E_Discriminant)
5943 && Present (Component_Clause (gnat_object)))
5944 gnat_error_node = Last_Bit (Component_Clause (gnat_object));
5945 else if (Present (Size_Clause (gnat_object)))
5946 gnat_error_node = Expression (Size_Clause (gnat_object));
5948 gnat_error_node = gnat_object;
5950 /* Return 0 if no size was specified, either because Esize was not Present or
5951 the specified size was zero. */
5952 if (No (uint_size) || uint_size == No_Uint)
5955 /* Get the size as a tree. Give an error if a size was specified, but cannot
5956 be represented as in sizetype. */
5957 size = UI_To_gnu (uint_size, bitsizetype);
5958 if (TREE_OVERFLOW (size))
5960 post_error_ne (component_p ? "component size of & is too large"
5961 : "size of & is too large",
5962 gnat_error_node, gnat_object);
5966 /* Ignore a negative size since that corresponds to our back-annotation.
5967 Also ignore a zero size unless a size clause exists. */
5968 else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok))
5971 /* The size of objects is always a multiple of a byte. */
5972 if (kind == VAR_DECL
5973 && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node)))
5976 post_error_ne ("component size for& is not a multiple of Storage_Unit",
5977 gnat_error_node, gnat_object);
5979 post_error_ne ("size for& is not a multiple of Storage_Unit",
5980 gnat_error_node, gnat_object);
5984 /* If this is an integral type or a packed array type, the front-end has
5985 verified the size, so we need not do it here (which would entail
5986 checking against the bounds). However, if this is an aliased object, it
5987 may not be smaller than the type of the object. */
5988 if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type))
5989 && !(kind == VAR_DECL && Is_Aliased (gnat_object)))
5992 /* If the object is a record that contains a template, add the size of
5993 the template to the specified size. */
5994 if (TREE_CODE (gnu_type) == RECORD_TYPE
5995 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
5996 size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size);
5998 /* Modify the size of the type to be that of the maximum size if it has a
5999 discriminant or the size of a thin pointer if this is a fat pointer. */
6000 if (type_size && CONTAINS_PLACEHOLDER_P (type_size))
6001 type_size = max_size (type_size, true);
6002 else if (TYPE_FAT_POINTER_P (gnu_type))
6003 type_size = bitsize_int (POINTER_SIZE);
6005 /* If this is an access type, the minimum size is that given by the smallest
6006 integral mode that's valid for pointers. */
6007 if (TREE_CODE (gnu_type) == POINTER_TYPE)
6009 enum machine_mode p_mode;
6011 for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
6012 !targetm.valid_pointer_mode (p_mode);
6013 p_mode = GET_MODE_WIDER_MODE (p_mode))
6016 type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));
6019 /* If the size of the object is a constant, the new size must not be
6021 if (TREE_CODE (type_size) != INTEGER_CST
6022 || TREE_OVERFLOW (type_size)
6023 || tree_int_cst_lt (size, type_size))
6027 ("component size for& too small{, minimum allowed is ^}",
6028 gnat_error_node, gnat_object, type_size);
6030 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
6031 gnat_error_node, gnat_object, type_size);
6033 if (kind == VAR_DECL && !component_p
6034 && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST
6035 && !tree_int_cst_lt (size, rm_size (gnu_type)))
6036 post_error_ne_tree_2
6037 ("\\size of ^ is not a multiple of alignment (^ bits)",
6038 gnat_error_node, gnat_object, rm_size (gnu_type),
6039 TYPE_ALIGN (gnu_type));
6041 else if (INTEGRAL_TYPE_P (gnu_type))
6042 post_error_ne ("\\size would be legal if & were not aliased!",
6043 gnat_error_node, gnat_object);
6051 /* Similarly, but both validate and process a value of RM_Size. This
6052 routine is only called for types. */
6055 set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity)
6057 /* Only give an error if a Value_Size clause was explicitly given.
6058 Otherwise, we'd be duplicating an error on the Size clause. */
6059 Node_Id gnat_attr_node
6060 = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size);
6061 tree old_size = rm_size (gnu_type);
6064 /* Get the size as a tree. Do nothing if none was specified, either
6065 because RM_Size was not Present or if the specified size was zero.
6066 Give an error if a size was specified, but cannot be represented as
6068 if (No (uint_size) || uint_size == No_Uint)
6071 size = UI_To_gnu (uint_size, bitsizetype);
6072 if (TREE_OVERFLOW (size))
6074 if (Present (gnat_attr_node))
6075 post_error_ne ("Value_Size of & is too large", gnat_attr_node,
6081 /* Ignore a negative size since that corresponds to our back-annotation.
6082 Also ignore a zero size unless a size clause exists, a Value_Size
6083 clause exists, or this is an integer type, in which case the
6084 front end will have always set it. */
6085 else if (tree_int_cst_sgn (size) < 0
6086 || (integer_zerop (size) && No (gnat_attr_node)
6087 && !Has_Size_Clause (gnat_entity)
6088 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)))
6091 /* If the old size is self-referential, get the maximum size. */
6092 if (CONTAINS_PLACEHOLDER_P (old_size))
6093 old_size = max_size (old_size, true);
6095 /* If the size of the object is a constant, the new size must not be
6096 smaller (the front end checks this for scalar types). */
6097 if (TREE_CODE (old_size) != INTEGER_CST
6098 || TREE_OVERFLOW (old_size)
6099 || (AGGREGATE_TYPE_P (gnu_type)
6100 && tree_int_cst_lt (size, old_size)))
6102 if (Present (gnat_attr_node))
6104 ("Value_Size for& too small{, minimum allowed is ^}",
6105 gnat_attr_node, gnat_entity, old_size);
6110 /* Otherwise, set the RM_Size. */
6111 if (TREE_CODE (gnu_type) == INTEGER_TYPE
6112 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity))
6113 TYPE_RM_SIZE_NUM (gnu_type) = size;
6114 else if (TREE_CODE (gnu_type) == ENUMERAL_TYPE)
6115 TYPE_RM_SIZE_NUM (gnu_type) = size;
6116 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
6117 || TREE_CODE (gnu_type) == UNION_TYPE
6118 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
6119 && !TYPE_IS_FAT_POINTER_P (gnu_type))
6120 SET_TYPE_ADA_SIZE (gnu_type, size);
6123 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
6124 If TYPE is the best type, return it. Otherwise, make a new type. We
6125 only support new integral and pointer types. BIASED_P is nonzero if
6126 we are making a biased type. */
6129 make_type_from_size (tree type, tree size_tree, bool biased_p)
6132 unsigned HOST_WIDE_INT size;
6135 /* If size indicates an error, just return TYPE to avoid propagating the
6136 error. Likewise if it's too large to represent. */
6137 if (!size_tree || !host_integerp (size_tree, 1))
6140 size = tree_low_cst (size_tree, 1);
6141 switch (TREE_CODE (type))
6145 /* Only do something if the type is not already the proper size and is
6146 not a packed array type. */
6147 if (TYPE_PACKED_ARRAY_TYPE_P (type)
6148 || (TYPE_PRECISION (type) == size
6149 && biased_p == (TREE_CODE (type) == INTEGER_CST
6150 && TYPE_BIASED_REPRESENTATION_P (type))))
6153 biased_p |= (TREE_CODE (type) == INTEGER_TYPE
6154 && TYPE_BIASED_REPRESENTATION_P (type));
6155 unsigned_p = TYPE_UNSIGNED (type) || biased_p;
6157 size = MIN (size, LONG_LONG_TYPE_SIZE);
6159 = unsigned_p ? make_unsigned_type (size) : make_signed_type (size);
6160 TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
6161 TYPE_MIN_VALUE (new_type)
6162 = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type));
6163 TYPE_MAX_VALUE (new_type)
6164 = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type));
6165 TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
6166 TYPE_RM_SIZE_NUM (new_type) = bitsize_int (size);
6170 /* Do something if this is a fat pointer, in which case we
6171 may need to return the thin pointer. */
6172 if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
6175 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)));
6179 /* Only do something if this is a thin pointer, in which case we
6180 may need to return the fat pointer. */
6181 if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
6183 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
6194 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
6195 a type or object whose present alignment is ALIGN. If this alignment is
6196 valid, return it. Otherwise, give an error and return ALIGN. */
6199 validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align)
6201 Node_Id gnat_error_node = gnat_entity;
6202 unsigned int new_align;
6204 #ifndef MAX_OFILE_ALIGNMENT
6205 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
6208 if (Present (Alignment_Clause (gnat_entity)))
6209 gnat_error_node = Expression (Alignment_Clause (gnat_entity));
6211 /* Don't worry about checking alignment if alignment was not specified
6212 by the source program and we already posted an error for this entity. */
6214 if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity))
6217 /* Within GCC, an alignment is an integer, so we must make sure a
6218 value is specified that fits in that range. Also, alignments of
6219 more than MAX_OFILE_ALIGNMENT can't be supported. */
6221 if (! UI_Is_In_Int_Range (alignment)
6222 || ((new_align = UI_To_Int (alignment))
6223 > MAX_OFILE_ALIGNMENT / BITS_PER_UNIT))
6224 post_error_ne_num ("largest supported alignment for& is ^",
6225 gnat_error_node, gnat_entity,
6226 MAX_OFILE_ALIGNMENT / BITS_PER_UNIT);
6227 else if (!(Present (Alignment_Clause (gnat_entity))
6228 && From_At_Mod (Alignment_Clause (gnat_entity)))
6229 && new_align * BITS_PER_UNIT < align)
6230 post_error_ne_num ("alignment for& must be at least ^",
6231 gnat_error_node, gnat_entity,
6232 align / BITS_PER_UNIT);
6234 align = MAX (align, new_align == 0 ? 1 : new_align * BITS_PER_UNIT);
6239 /* Verify that OBJECT, a type or decl, is something we can implement
6240 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
6241 if we require atomic components. */
6244 check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p)
6246 Node_Id gnat_error_point = gnat_entity;
6248 enum machine_mode mode;
6252 /* There are three case of what OBJECT can be. It can be a type, in which
6253 case we take the size, alignment and mode from the type. It can be a
6254 declaration that was indirect, in which case the relevant values are
6255 that of the type being pointed to, or it can be a normal declaration,
6256 in which case the values are of the decl. The code below assumes that
6257 OBJECT is either a type or a decl. */
6258 if (TYPE_P (object))
6260 mode = TYPE_MODE (object);
6261 align = TYPE_ALIGN (object);
6262 size = TYPE_SIZE (object);
6264 else if (DECL_BY_REF_P (object))
6266 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object)));
6267 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object)));
6268 size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object)));
6272 mode = DECL_MODE (object);
6273 align = DECL_ALIGN (object);
6274 size = DECL_SIZE (object);
6277 /* Consider all floating-point types atomic and any types that that are
6278 represented by integers no wider than a machine word. */
6279 if (GET_MODE_CLASS (mode) == MODE_FLOAT
6280 || ((GET_MODE_CLASS (mode) == MODE_INT
6281 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
6282 && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD))
6285 /* For the moment, also allow anything that has an alignment equal
6286 to its size and which is smaller than a word. */
6287 if (size && TREE_CODE (size) == INTEGER_CST
6288 && compare_tree_int (size, align) == 0
6289 && align <= BITS_PER_WORD)
6292 for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node);
6293 gnat_node = Next_Rep_Item (gnat_node))
6295 if (!comp_p && Nkind (gnat_node) == N_Pragma
6296 && Get_Pragma_Id (Chars (gnat_node)) == Pragma_Atomic)
6297 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
6298 else if (comp_p && Nkind (gnat_node) == N_Pragma
6299 && (Get_Pragma_Id (Chars (gnat_node))
6300 == Pragma_Atomic_Components))
6301 gnat_error_point = First (Pragma_Argument_Associations (gnat_node));
6305 post_error_ne ("atomic access to component of & cannot be guaranteed",
6306 gnat_error_point, gnat_entity);
6308 post_error_ne ("atomic access to & cannot be guaranteed",
6309 gnat_error_point, gnat_entity);
6312 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
6313 have compatible signatures so that a call using one type may be safely
6314 issued if the actual target function type is the other. Return 1 if it is
6315 the case, 0 otherwise, and post errors on the incompatibilities.
6317 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
6318 that calls to the subprogram will have arguments suitable for the later
6319 underlying builtin expansion. */
6322 compatible_signatures_p (tree ftype1, tree ftype2)
6324 /* As of now, we only perform very trivial tests and consider it's the
6325 programmer's responsibility to ensure the type correctness in the Ada
6326 declaration, as in the regular Import cases.
6328 Mismatches typically result in either error messages from the builtin
6329 expander, internal compiler errors, or in a real call sequence. This
6330 should be refined to issue diagnostics helping error detection and
6333 /* Almost fake test, ensuring a use of each argument. */
6334 if (ftype1 == ftype2)
6340 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a new type
6341 with all size expressions that contain F updated by replacing F with R.
6342 This is identical to GCC's substitute_in_type except that it knows about
6343 TYPE_INDEX_TYPE. If F is NULL_TREE, always make a new RECORD_TYPE, even if
6344 nothing has changed. */
6347 gnat_substitute_in_type (tree t, tree f, tree r)
6352 switch (TREE_CODE (t))
6358 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
6359 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
6361 tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
6362 tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
6364 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
6367 new = build_range_type (TREE_TYPE (t), low, high);
6368 if (TYPE_INDEX_TYPE (t))
6370 (new, gnat_substitute_in_type (TYPE_INDEX_TYPE (t), f, r));
6377 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t))
6378 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t)))
6380 tree low = NULL_TREE, high = NULL_TREE;
6382 if (TYPE_MIN_VALUE (t))
6383 low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r);
6384 if (TYPE_MAX_VALUE (t))
6385 high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r);
6387 if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t))
6391 TYPE_MIN_VALUE (t) = low;
6392 TYPE_MAX_VALUE (t) = high;
6397 tem = gnat_substitute_in_type (TREE_TYPE (t), f, r);
6398 if (tem == TREE_TYPE (t))
6401 return build_complex_type (tem);
6407 /* Don't know how to do these yet. */
6412 tree component = gnat_substitute_in_type (TREE_TYPE (t), f, r);
6413 tree domain = gnat_substitute_in_type (TYPE_DOMAIN (t), f, r);
6415 if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
6418 new = build_array_type (component, domain);
6419 TYPE_SIZE (new) = 0;
6420 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t);
6421 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t);
6423 TYPE_ALIGN (new) = TYPE_ALIGN (t);
6425 /* If we had bounded the sizes of T by a constant, bound the sizes of
6426 NEW by the same constant. */
6427 if (TREE_CODE (TYPE_SIZE (t)) == MIN_EXPR)
6429 = size_binop (MIN_EXPR, TREE_OPERAND (TYPE_SIZE (t), 1),
6431 if (TREE_CODE (TYPE_SIZE_UNIT (t)) == MIN_EXPR)
6432 TYPE_SIZE_UNIT (new)
6433 = size_binop (MIN_EXPR, TREE_OPERAND (TYPE_SIZE_UNIT (t), 1),
6434 TYPE_SIZE_UNIT (new));
6440 case QUAL_UNION_TYPE:
6444 = (f == NULL_TREE && !TREE_CONSTANT (TYPE_SIZE (t)));
6445 bool field_has_rep = false;
6446 tree last_field = NULL_TREE;
6448 tree new = copy_type (t);
6450 /* Start out with no fields, make new fields, and chain them
6451 in. If we haven't actually changed the type of any field,
6452 discard everything we've done and return the old type. */
6454 TYPE_FIELDS (new) = NULL_TREE;
6455 TYPE_SIZE (new) = NULL_TREE;
6457 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
6459 tree new_field = copy_node (field);
6461 TREE_TYPE (new_field)
6462 = gnat_substitute_in_type (TREE_TYPE (new_field), f, r);
6464 if (DECL_HAS_REP_P (field) && !DECL_INTERNAL_P (field))
6465 field_has_rep = true;
6466 else if (TREE_TYPE (new_field) != TREE_TYPE (field))
6467 changed_field = true;
6469 /* If this is an internal field and the type of this field is
6470 a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If
6471 the type just has one element, treat that as the field.
6472 But don't do this if we are processing a QUAL_UNION_TYPE. */
6473 if (TREE_CODE (t) != QUAL_UNION_TYPE
6474 && DECL_INTERNAL_P (new_field)
6475 && (TREE_CODE (TREE_TYPE (new_field)) == UNION_TYPE
6476 || TREE_CODE (TREE_TYPE (new_field)) == RECORD_TYPE))
6478 if (!TYPE_FIELDS (TREE_TYPE (new_field)))
6481 if (!TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field))))
6484 = copy_node (TYPE_FIELDS (TREE_TYPE (new_field)));
6486 /* Make sure omitting the union doesn't change
6488 DECL_ALIGN (next_new_field) = DECL_ALIGN (new_field);
6489 new_field = next_new_field;
6493 DECL_CONTEXT (new_field) = new;
6494 SET_DECL_ORIGINAL_FIELD (new_field,
6495 (DECL_ORIGINAL_FIELD (field)
6496 ? DECL_ORIGINAL_FIELD (field) : field));
6498 /* If the size of the old field was set at a constant,
6499 propagate the size in case the type's size was variable.
6500 (This occurs in the case of a variant or discriminated
6501 record with a default size used as a field of another
6503 DECL_SIZE (new_field)
6504 = TREE_CODE (DECL_SIZE (field)) == INTEGER_CST
6505 ? DECL_SIZE (field) : NULL_TREE;
6506 DECL_SIZE_UNIT (new_field)
6507 = TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST
6508 ? DECL_SIZE_UNIT (field) : NULL_TREE;
6510 if (TREE_CODE (t) == QUAL_UNION_TYPE)
6512 tree new_q = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r);
6514 if (new_q != DECL_QUALIFIER (new_field))
6515 changed_field = true;
6517 /* Do the substitution inside the qualifier and if we find
6518 that this field will not be present, omit it. */
6519 DECL_QUALIFIER (new_field) = new_q;
6521 if (integer_zerop (DECL_QUALIFIER (new_field)))
6526 TYPE_FIELDS (new) = new_field;
6528 TREE_CHAIN (last_field) = new_field;
6530 last_field = new_field;
6532 /* If this is a qualified type and this field will always be
6533 present, we are done. */
6534 if (TREE_CODE (t) == QUAL_UNION_TYPE
6535 && integer_onep (DECL_QUALIFIER (new_field)))
6539 /* If this used to be a qualified union type, but we now know what
6540 field will be present, make this a normal union. */
6541 if (changed_field && TREE_CODE (new) == QUAL_UNION_TYPE
6542 && (!TYPE_FIELDS (new)
6543 || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new)))))
6544 TREE_SET_CODE (new, UNION_TYPE);
6545 else if (!changed_field)
6548 gcc_assert (!field_has_rep);
6551 /* If the size was originally a constant use it. */
6552 if (TYPE_SIZE (t) && TREE_CODE (TYPE_SIZE (t)) == INTEGER_CST
6553 && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST)
6555 TYPE_SIZE (new) = TYPE_SIZE (t);
6556 TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t);
6557 SET_TYPE_ADA_SIZE (new, TYPE_ADA_SIZE (t));
6568 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
6569 needed to represent the object. */
6572 rm_size (tree gnu_type)
6574 /* For integer types, this is the precision. For record types, we store
6575 the size explicitly. For other types, this is just the size. */
6577 if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type))
6578 return TYPE_RM_SIZE (gnu_type);
6579 else if (TREE_CODE (gnu_type) == RECORD_TYPE
6580 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
6581 /* Return the rm_size of the actual data plus the size of the template. */
6583 size_binop (PLUS_EXPR,
6584 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))),
6585 DECL_SIZE (TYPE_FIELDS (gnu_type)));
6586 else if ((TREE_CODE (gnu_type) == RECORD_TYPE
6587 || TREE_CODE (gnu_type) == UNION_TYPE
6588 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
6589 && !TYPE_IS_FAT_POINTER_P (gnu_type)
6590 && TYPE_ADA_SIZE (gnu_type))
6591 return TYPE_ADA_SIZE (gnu_type);
6593 return TYPE_SIZE (gnu_type);
6596 /* Return an identifier representing the external name to be used for
6597 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
6598 and the specified suffix. */
6601 create_concat_name (Entity_Id gnat_entity, const char *suffix)
6603 const char *str = (!suffix ? "" : suffix);
6604 String_Template temp = {1, strlen (str)};
6605 Fat_Pointer fp = {str, &temp};
6607 Get_External_Name_With_Suffix (gnat_entity, fp);
6610 /* A variable using the Stdcall convention (meaning we are running
6611 on a Windows box) live in a DLL. Here we adjust its name to use
6612 the jump-table, the _imp__NAME contains the address for the NAME
6615 Entity_Kind kind = Ekind (gnat_entity);
6616 const char *prefix = "_imp__";
6617 int plen = strlen (prefix);
6619 if ((kind == E_Variable || kind == E_Constant)
6620 && Convention (gnat_entity) == Convention_Stdcall)
6623 for (k = 0; k <= Name_Len; k++)
6624 Name_Buffer [Name_Len - k + plen] = Name_Buffer [Name_Len - k];
6625 strncpy (Name_Buffer, prefix, plen);
6630 return get_identifier (Name_Buffer);
6633 /* Return the name to be used for GNAT_ENTITY. If a type, create a
6634 fully-qualified name, possibly with type information encoding.
6635 Otherwise, return the name. */
6638 get_entity_name (Entity_Id gnat_entity)
6640 Get_Encoded_Name (gnat_entity);
6641 return get_identifier (Name_Buffer);
6644 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
6645 string, return a new IDENTIFIER_NODE that is the concatenation of
6646 the name in GNU_ID and SUFFIX. */
6649 concat_id_with_name (tree gnu_id, const char *suffix)
6651 int len = IDENTIFIER_LENGTH (gnu_id);
6653 strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id),
6654 IDENTIFIER_LENGTH (gnu_id));
6655 strncpy (Name_Buffer + len, "___", 3);
6657 strcpy (Name_Buffer + len, suffix);
6658 return get_identifier (Name_Buffer);
6661 #include "gt-ada-decl.h"