1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2006, 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, 51 Franklin Street, Fifth Floor, *
20 * Boston, MA 02110-1301, 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"
56 /* Convention_Stdcall should be processed in a specific way on Windows targets
57 only. The macro below is a helper to avoid having to check for a Windows
58 specific attribute throughout this unit. */
60 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
61 #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall)
63 #define Has_Stdcall_Convention(E) (0)
66 /* These two variables are used to defer recursively expanding incomplete
67 types while we are processing a record or subprogram type. */
69 static int defer_incomplete_level
= 0;
70 static struct incomplete
72 struct incomplete
*next
;
75 } *defer_incomplete_list
= 0;
77 /* These two variables are used to defer emission of debug information for
78 nested incomplete record types */
80 static int defer_debug_level
= 0;
81 static tree defer_debug_incomplete_list
;
83 static void copy_alias_set (tree
, tree
);
84 static tree
substitution_list (Entity_Id
, Entity_Id
, tree
, bool);
85 static bool allocatable_size_p (tree
, bool);
86 static void prepend_attributes (Entity_Id
, struct attrib
**);
87 static tree
elaborate_expression (Node_Id
, Entity_Id
, tree
, bool, bool, bool);
88 static bool is_variable_size (tree
);
89 static tree
elaborate_expression_1 (Node_Id
, Entity_Id
, tree
, tree
,
91 static tree
make_packable_type (tree
);
92 static tree
gnat_to_gnu_field (Entity_Id
, tree
, int, bool);
93 static void components_to_record (tree
, Node_Id
, tree
, int, bool, tree
*,
94 bool, bool, bool, bool);
95 static int compare_field_bitpos (const PTR
, const PTR
);
96 static Uint
annotate_value (tree
);
97 static void annotate_rep (Entity_Id
, tree
);
98 static tree
compute_field_positions (tree
, tree
, tree
, tree
, unsigned int);
99 static tree
validate_size (Uint
, tree
, Entity_Id
, enum tree_code
, bool, bool);
100 static void set_rm_size (Uint
, tree
, Entity_Id
);
101 static tree
make_type_from_size (tree
, tree
, bool);
102 static unsigned int validate_alignment (Uint
, Entity_Id
, unsigned int);
103 static void check_ok_for_atomic (tree
, Entity_Id
, bool);
104 static int compatible_signatures_p (tree ftype1
, tree ftype2
);
106 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
107 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
108 refer to an Ada type. */
111 gnat_to_gnu_type (Entity_Id gnat_entity
)
115 /* The back end never attempts to annotate generic types */
116 if (Is_Generic_Type (gnat_entity
) && type_annotate_only
)
117 return void_type_node
;
119 /* Convert the ada entity type into a GCC TYPE_DECL node. */
120 gnu_decl
= gnat_to_gnu_entity (gnat_entity
, NULL_TREE
, 0);
121 gcc_assert (TREE_CODE (gnu_decl
) == TYPE_DECL
);
122 return TREE_TYPE (gnu_decl
);
125 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
126 entity, this routine returns the equivalent GCC tree for that entity
127 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
130 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
131 initial value (in GCC tree form). This is optional for variables.
132 For renamed entities, GNU_EXPR gives the object being renamed.
134 DEFINITION is nonzero if this call is intended for a definition. This is
135 used for separate compilation where it necessary to know whether an
136 external declaration or a definition should be created if the GCC equivalent
137 was not created previously. The value of 1 is normally used for a nonzero
138 DEFINITION, but a value of 2 is used in special circumstances, defined in
142 gnat_to_gnu_entity (Entity_Id gnat_entity
, tree gnu_expr
, int definition
)
145 tree gnu_type
= NULL_TREE
;
146 /* Contains the gnu XXXX_DECL tree node which is equivalent to the input
147 GNAT tree. This node will be associated with the GNAT node by calling
148 the save_gnu_tree routine at the end of the `switch' statement. */
149 tree gnu_decl
= NULL_TREE
;
150 /* true if we have already saved gnu_decl as a gnat association. */
152 /* Nonzero if we incremented defer_incomplete_level. */
153 bool this_deferred
= false;
154 /* Nonzero if we incremented defer_debug_level. */
155 bool debug_deferred
= false;
156 /* Nonzero if we incremented force_global. */
157 bool this_global
= false;
158 /* Nonzero if we should check to see if elaborated during processing. */
159 bool maybe_present
= false;
160 /* Nonzero if we made GNU_DECL and its type here. */
161 bool this_made_decl
= false;
162 struct attrib
*attr_list
= NULL
;
163 bool debug_info_p
= (Needs_Debug_Info (gnat_entity
)
164 || debug_info_level
== DINFO_LEVEL_VERBOSE
);
165 Entity_Kind kind
= Ekind (gnat_entity
);
168 = ((Known_Esize (gnat_entity
)
169 && UI_Is_In_Int_Range (Esize (gnat_entity
)))
170 ? MIN (UI_To_Int (Esize (gnat_entity
)),
171 IN (kind
, Float_Kind
)
172 ? fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE
)
173 : IN (kind
, Access_Kind
) ? POINTER_SIZE
* 2
174 : LONG_LONG_TYPE_SIZE
)
175 : LONG_LONG_TYPE_SIZE
);
178 = ((Is_Imported (gnat_entity
) && No (Address_Clause (gnat_entity
)))
179 || From_With_Type (gnat_entity
));
180 unsigned int align
= 0;
182 /* Since a use of an Itype is a definition, process it as such if it
183 is not in a with'ed unit. */
185 if (!definition
&& Is_Itype (gnat_entity
)
186 && !present_gnu_tree (gnat_entity
)
187 && In_Extended_Main_Code_Unit (gnat_entity
))
189 /* Ensure that we are in a subprogram mentioned in the Scope
190 chain of this entity, our current scope is global,
191 or that we encountered a task or entry (where we can't currently
192 accurately check scoping). */
193 if (!current_function_decl
194 || DECL_ELABORATION_PROC_P (current_function_decl
))
196 process_type (gnat_entity
);
197 return get_gnu_tree (gnat_entity
);
200 for (gnat_temp
= Scope (gnat_entity
);
201 Present (gnat_temp
); gnat_temp
= Scope (gnat_temp
))
203 if (Is_Type (gnat_temp
))
204 gnat_temp
= Underlying_Type (gnat_temp
);
206 if (Ekind (gnat_temp
) == E_Subprogram_Body
)
208 = Corresponding_Spec (Parent (Declaration_Node (gnat_temp
)));
210 if (IN (Ekind (gnat_temp
), Subprogram_Kind
)
211 && Present (Protected_Body_Subprogram (gnat_temp
)))
212 gnat_temp
= Protected_Body_Subprogram (gnat_temp
);
214 if (Ekind (gnat_temp
) == E_Entry
215 || Ekind (gnat_temp
) == E_Entry_Family
216 || Ekind (gnat_temp
) == E_Task_Type
217 || (IN (Ekind (gnat_temp
), Subprogram_Kind
)
218 && present_gnu_tree (gnat_temp
)
219 && (current_function_decl
220 == gnat_to_gnu_entity (gnat_temp
, NULL_TREE
, 0))))
222 process_type (gnat_entity
);
223 return get_gnu_tree (gnat_entity
);
227 /* This abort means the entity "gnat_entity" has an incorrect scope,
228 i.e. that its scope does not correspond to the subprogram in which
233 /* If this is entity 0, something went badly wrong. */
234 gcc_assert (Present (gnat_entity
));
236 /* If we've already processed this entity, return what we got last time.
237 If we are defining the node, we should not have already processed it.
238 In that case, we will abort below when we try to save a new GCC tree for
239 this object. We also need to handle the case of getting a dummy type
240 when a Full_View exists. */
242 if (present_gnu_tree (gnat_entity
)
244 || (Is_Type (gnat_entity
) && imported_p
)))
246 gnu_decl
= get_gnu_tree (gnat_entity
);
248 if (TREE_CODE (gnu_decl
) == TYPE_DECL
249 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl
))
250 && IN (kind
, Incomplete_Or_Private_Kind
)
251 && Present (Full_View (gnat_entity
)))
253 gnu_decl
= gnat_to_gnu_entity (Full_View (gnat_entity
),
256 save_gnu_tree (gnat_entity
, NULL_TREE
, false);
257 save_gnu_tree (gnat_entity
, gnu_decl
, false);
263 /* If this is a numeric or enumeral type, or an access type, a nonzero
264 Esize must be specified unless it was specified by the programmer. */
265 gcc_assert (!Unknown_Esize (gnat_entity
)
266 || Has_Size_Clause (gnat_entity
)
267 || (!IN (kind
, Numeric_Kind
) && !IN (kind
, Enumeration_Kind
)
268 && (!IN (kind
, Access_Kind
)
269 || kind
== E_Access_Protected_Subprogram_Type
270 || kind
== E_Access_Subtype
)));
272 /* Likewise, RM_Size must be specified for all discrete and fixed-point
274 gcc_assert (!IN (kind
, Discrete_Or_Fixed_Point_Kind
)
275 || !Unknown_RM_Size (gnat_entity
));
277 /* Get the name of the entity and set up the line number and filename of
278 the original definition for use in any decl we make. */
279 gnu_entity_id
= get_entity_name (gnat_entity
);
280 Sloc_to_locus (Sloc (gnat_entity
), &input_location
);
282 /* If we get here, it means we have not yet done anything with this
283 entity. If we are not defining it here, it must be external,
284 otherwise we should have defined it already. */
285 gcc_assert (definition
|| Is_Public (gnat_entity
) || type_annotate_only
286 || kind
== E_Discriminant
|| kind
== E_Component
288 || (kind
== E_Constant
&& Present (Full_View (gnat_entity
)))
289 || IN (kind
, Type_Kind
));
291 /* For cases when we are not defining (i.e., we are referencing from
292 another compilation unit) Public entities, show we are at global level
293 for the purpose of computing scopes. Don't do this for components or
294 discriminants since the relevant test is whether or not the record is
295 being defined. But do this for Imported functions or procedures in
297 if ((!definition
&& Is_Public (gnat_entity
)
298 && !Is_Statically_Allocated (gnat_entity
)
299 && kind
!= E_Discriminant
&& kind
!= E_Component
)
300 || (Is_Imported (gnat_entity
)
301 && (kind
== E_Function
|| kind
== E_Procedure
)))
302 force_global
++, this_global
= true;
304 /* Handle any attributes directly attached to the entity. */
305 if (Has_Gigi_Rep_Item (gnat_entity
))
306 prepend_attributes (gnat_entity
, &attr_list
);
308 /* Machine_Attributes on types are expected to be propagated to subtypes.
309 The corresponding Gigi_Rep_Items are only attached to the first subtype
310 though, so we handle the propagation here. */
311 if (Is_Type (gnat_entity
) && Base_Type (gnat_entity
) != gnat_entity
312 && !Is_First_Subtype (gnat_entity
)
313 && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity
))))
314 prepend_attributes (First_Subtype (Base_Type (gnat_entity
)), &attr_list
);
319 /* If this is a use of a deferred constant, get its full
321 if (!definition
&& Present (Full_View (gnat_entity
)))
323 gnu_decl
= gnat_to_gnu_entity (Full_View (gnat_entity
),
324 gnu_expr
, definition
);
329 /* If we have an external constant that we are not defining,
330 get the expression that is was defined to represent. We
331 may throw that expression away later if it is not a
333 Do not retrieve the expression if it is an aggregate, because
334 in complex instantiation contexts it may not be expanded */
337 && Present (Expression (Declaration_Node (gnat_entity
)))
338 && !No_Initialization (Declaration_Node (gnat_entity
))
339 && (Nkind (Expression (Declaration_Node (gnat_entity
)))
341 gnu_expr
= gnat_to_gnu (Expression (Declaration_Node (gnat_entity
)));
343 /* Ignore deferred constant definitions; they are processed fully in the
344 front-end. For deferred constant references, get the full
345 definition. On the other hand, constants that are renamings are
346 handled like variable renamings. If No_Initialization is set, this is
347 not a deferred constant but a constant whose value is built
350 if (definition
&& !gnu_expr
351 && !No_Initialization (Declaration_Node (gnat_entity
))
352 && No (Renamed_Object (gnat_entity
)))
354 gnu_decl
= error_mark_node
;
358 else if (!definition
&& IN (kind
, Incomplete_Or_Private_Kind
)
359 && Present (Full_View (gnat_entity
)))
361 gnu_decl
= gnat_to_gnu_entity (Full_View (gnat_entity
),
370 /* We used to special case VMS exceptions here to directly map them to
371 their associated condition code. Since this code had to be masked
372 dynamically to strip off the severity bits, this caused trouble in
373 the GCC/ZCX case because the "type" pointers we store in the tables
374 have to be static. We now don't special case here anymore, and let
375 the regular processing take place, which leaves us with a regular
376 exception data object for VMS exceptions too. The condition code
377 mapping is taken care of by the front end and the bitmasking by the
384 /* The GNAT record where the component was defined. */
385 Entity_Id gnat_record
= Underlying_Type (Scope (gnat_entity
));
387 /* If the variable is an inherited record component (in the case of
388 extended record types), just return the inherited entity, which
389 must be a FIELD_DECL. Likewise for discriminants.
390 For discriminants of untagged records which have explicit
391 stored discriminants, return the entity for the corresponding
392 stored discriminant. Also use Original_Record_Component
393 if the record has a private extension. */
395 if (Present (Original_Record_Component (gnat_entity
))
396 && Original_Record_Component (gnat_entity
) != gnat_entity
)
399 = gnat_to_gnu_entity (Original_Record_Component (gnat_entity
),
400 gnu_expr
, definition
);
405 /* If the enclosing record has explicit stored discriminants,
406 then it is an untagged record. If the Corresponding_Discriminant
407 is not empty then this must be a renamed discriminant and its
408 Original_Record_Component must point to the corresponding explicit
409 stored discriminant (i.e., we should have taken the previous
412 else if (Present (Corresponding_Discriminant (gnat_entity
))
413 && Is_Tagged_Type (gnat_record
))
415 /* A tagged record has no explicit stored discriminants. */
417 gcc_assert (First_Discriminant (gnat_record
)
418 == First_Stored_Discriminant (gnat_record
));
420 = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity
),
421 gnu_expr
, definition
);
426 /* If the enclosing record has explicit stored discriminants,
427 then it is an untagged record. If the Corresponding_Discriminant
428 is not empty then this must be a renamed discriminant and its
429 Original_Record_Component must point to the corresponding explicit
430 stored discriminant (i.e., we should have taken the first
433 else if (Present (Corresponding_Discriminant (gnat_entity
))
434 && (First_Discriminant (gnat_record
)
435 != First_Stored_Discriminant (gnat_record
)))
438 /* Otherwise, if we are not defining this and we have no GCC type
439 for the containing record, make one for it. Then we should
440 have made our own equivalent. */
441 else if (!definition
&& !present_gnu_tree (gnat_record
))
443 /* ??? If this is in a record whose scope is a protected
444 type and we have an Original_Record_Component, use it.
445 This is a workaround for major problems in protected type
448 Entity_Id Scop
= Scope (Scope (gnat_entity
));
449 if ((Is_Protected_Type (Scop
)
450 || (Is_Private_Type (Scop
)
451 && Present (Full_View (Scop
))
452 && Is_Protected_Type (Full_View (Scop
))))
453 && Present (Original_Record_Component (gnat_entity
)))
456 = gnat_to_gnu_entity (Original_Record_Component
458 gnu_expr
, definition
);
463 gnat_to_gnu_entity (Scope (gnat_entity
), NULL_TREE
, 0);
464 gnu_decl
= get_gnu_tree (gnat_entity
);
470 /* Here we have no GCC type and this is a reference rather than a
471 definition. This should never happen. Most likely the cause is a
472 reference before declaration in the gnat tree for gnat_entity. */
476 case E_Loop_Parameter
:
477 case E_Out_Parameter
:
480 /* Simple variables, loop variables, OUT parameters, and exceptions. */
483 bool used_by_ref
= false;
485 = ((kind
== E_Constant
|| kind
== E_Variable
)
486 && !Is_Statically_Allocated (gnat_entity
)
487 && Is_True_Constant (gnat_entity
)
488 && (((Nkind (Declaration_Node (gnat_entity
))
489 == N_Object_Declaration
)
490 && Present (Expression (Declaration_Node (gnat_entity
))))
491 || Present (Renamed_Object (gnat_entity
))));
492 bool inner_const_flag
= const_flag
;
493 bool static_p
= Is_Statically_Allocated (gnat_entity
);
494 bool mutable_p
= false;
495 tree gnu_ext_name
= NULL_TREE
;
496 tree renamed_obj
= NULL_TREE
;
498 if (Present (Renamed_Object (gnat_entity
)) && !definition
)
500 if (kind
== E_Exception
)
501 gnu_expr
= gnat_to_gnu_entity (Renamed_Entity (gnat_entity
),
504 gnu_expr
= gnat_to_gnu (Renamed_Object (gnat_entity
));
507 /* Get the type after elaborating the renamed object. */
508 gnu_type
= gnat_to_gnu_type (Etype (gnat_entity
));
510 /* If this is a loop variable, its type should be the base type.
511 This is because the code for processing a loop determines whether
512 a normal loop end test can be done by comparing the bounds of the
513 loop against those of the base type, which is presumed to be the
514 size used for computation. But this is not correct when the size
515 of the subtype is smaller than the type. */
516 if (kind
== E_Loop_Parameter
)
517 gnu_type
= get_base_type (gnu_type
);
519 /* Reject non-renamed objects whose types are unconstrained arrays or
520 any object whose type is a dummy type or VOID_TYPE. */
522 if ((TREE_CODE (gnu_type
) == UNCONSTRAINED_ARRAY_TYPE
523 && No (Renamed_Object (gnat_entity
)))
524 || TYPE_IS_DUMMY_P (gnu_type
)
525 || TREE_CODE (gnu_type
) == VOID_TYPE
)
527 gcc_assert (type_annotate_only
);
530 return error_mark_node
;
533 /* If an alignment is specified, use it if valid. Note that
534 exceptions are objects but don't have alignments. We must do this
535 before we validate the size, since the alignment can affect the
537 if (kind
!= E_Exception
&& Known_Alignment (gnat_entity
))
539 gcc_assert (Present (Alignment (gnat_entity
)));
540 align
= validate_alignment (Alignment (gnat_entity
), gnat_entity
,
541 TYPE_ALIGN (gnu_type
));
542 gnu_type
= maybe_pad_type (gnu_type
, NULL_TREE
, align
,
543 gnat_entity
, "PAD", 0, definition
, 1);
546 /* If we are defining the object, see if it has a Size value and
547 validate it if so. If we are not defining the object and a Size
548 clause applies, simply retrieve the value. We don't want to ignore
549 the clause and it is expected to have been validated already. Then
550 get the new type, if any. */
552 gnu_size
= validate_size (Esize (gnat_entity
), gnu_type
,
553 gnat_entity
, VAR_DECL
, false,
554 Has_Size_Clause (gnat_entity
));
555 else if (Has_Size_Clause (gnat_entity
))
556 gnu_size
= UI_To_gnu (Esize (gnat_entity
), bitsizetype
);
561 = make_type_from_size (gnu_type
, gnu_size
,
562 Has_Biased_Representation (gnat_entity
));
564 if (operand_equal_p (TYPE_SIZE (gnu_type
), gnu_size
, 0))
565 gnu_size
= NULL_TREE
;
568 /* If this object has self-referential size, it must be a record with
569 a default value. We are supposed to allocate an object of the
570 maximum size in this case unless it is a constant with an
571 initializing expression, in which case we can get the size from
572 that. Note that the resulting size may still be a variable, so
573 this may end up with an indirect allocation. */
575 if (No (Renamed_Object (gnat_entity
))
576 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type
)))
578 if (gnu_expr
&& kind
== E_Constant
)
580 = SUBSTITUTE_PLACEHOLDER_IN_EXPR
581 (TYPE_SIZE (TREE_TYPE (gnu_expr
)), gnu_expr
);
583 /* We may have no GNU_EXPR because No_Initialization is
584 set even though there's an Expression. */
585 else if (kind
== E_Constant
586 && (Nkind (Declaration_Node (gnat_entity
))
587 == N_Object_Declaration
)
588 && Present (Expression (Declaration_Node (gnat_entity
))))
590 = TYPE_SIZE (gnat_to_gnu_type
592 (Expression (Declaration_Node (gnat_entity
)))));
595 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
))));
671 = build_unc_object_type_from_ptr (gnu_fat
, gnu_type
,
672 concat_id_with_name (gnu_entity_id
,
676 #ifdef MINIMUM_ATOMIC_ALIGNMENT
677 /* If the size is a constant and no alignment is specified, force
678 the alignment to be the minimum valid atomic alignment. The
679 restriction on constant size avoids problems with variable-size
680 temporaries; if the size is variable, there's no issue with
681 atomic access. Also don't do this for a constant, since it isn't
682 necessary and can interfere with constant replacement. Finally,
683 do not do it for Out parameters since that creates an
684 size inconsistency with In parameters. */
685 if (align
== 0 && MINIMUM_ATOMIC_ALIGNMENT
> TYPE_ALIGN (gnu_type
)
686 && !FLOAT_TYPE_P (gnu_type
)
687 && !const_flag
&& No (Renamed_Object (gnat_entity
))
688 && !imported_p
&& No (Address_Clause (gnat_entity
))
689 && kind
!= E_Out_Parameter
690 && (gnu_size
? TREE_CODE (gnu_size
) == INTEGER_CST
691 : TREE_CODE (TYPE_SIZE (gnu_type
)) == INTEGER_CST
))
692 align
= MINIMUM_ATOMIC_ALIGNMENT
;
695 /* Make a new type with the desired size and alignment, if needed. */
696 gnu_type
= maybe_pad_type (gnu_type
, gnu_size
, align
, gnat_entity
,
697 "PAD", false, definition
, true);
699 /* Make a volatile version of this object's type if we are to
700 make the object volatile. Note that 13.3(19) says that we
701 should treat other types of objects as volatile as well. */
702 if ((Treat_As_Volatile (gnat_entity
)
703 || Is_Exported (gnat_entity
)
704 || Is_Imported (gnat_entity
)
705 || Present (Address_Clause (gnat_entity
)))
706 && !TYPE_VOLATILE (gnu_type
))
707 gnu_type
= build_qualified_type (gnu_type
,
708 (TYPE_QUALS (gnu_type
)
709 | TYPE_QUAL_VOLATILE
));
711 /* Convert the expression to the type of the object except in the
712 case where the object's type is unconstrained or the object's type
713 is a padded record whose field is of self-referential size. In
714 the former case, converting will generate unnecessary evaluations
715 of the CONSTRUCTOR to compute the size and in the latter case, we
716 want to only copy the actual data. */
718 && TREE_CODE (gnu_type
) != UNCONSTRAINED_ARRAY_TYPE
719 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type
))
720 && !(TREE_CODE (gnu_type
) == RECORD_TYPE
721 && TYPE_IS_PADDING_P (gnu_type
)
722 && (CONTAINS_PLACEHOLDER_P
723 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type
)))))))
724 gnu_expr
= convert (gnu_type
, gnu_expr
);
726 /* See if this is a renaming, and handle appropriately depending on
727 what is renamed and in which context. There are three major
730 1/ This is a constant renaming and we can just make an object
731 with what is renamed as its initial value,
733 2/ We can reuse a stabilized version of what is renamed in place
736 3/ If neither 1 or 2 applies, we make the renaming entity a constant
737 pointer to what is being renamed. */
739 if (Present (Renamed_Object (gnat_entity
)))
741 /* If the renamed object had padding, strip off the reference
742 to the inner object and reset our type. */
743 if (TREE_CODE (gnu_expr
) == COMPONENT_REF
744 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr
, 0)))
746 && (TYPE_IS_PADDING_P
747 (TREE_TYPE (TREE_OPERAND (gnu_expr
, 0)))))
749 gnu_expr
= TREE_OPERAND (gnu_expr
, 0);
750 gnu_type
= TREE_TYPE (gnu_expr
);
753 /* Case 1: If this is a constant renaming, treat it as a normal
754 object whose initial value is what is being renamed. We cannot
755 do this if the type is unconstrained or class-wide. */
757 && !TREE_SIDE_EFFECTS (gnu_expr
)
758 && TREE_CODE (gnu_type
) != UNCONSTRAINED_ARRAY_TYPE
759 && TYPE_MODE (gnu_type
) != BLKmode
760 && Ekind (Etype (gnat_entity
)) != E_Class_Wide_Type
761 && !Is_Array_Type (Etype (gnat_entity
)))
764 /* Otherwise, see if we can proceed with a stabilized version of
765 the renamed entity or if we need to make a pointer. */
768 bool stabilized
= false;
769 tree maybe_stable_expr
= NULL_TREE
;
771 /* Case 2: If the renaming entity need not be materialized and
772 the renamed expression is something we can stabilize, use
773 that for the renaming. At the global level, we can only do
774 this if we know no SAVE_EXPRs need be made, because the
775 expression we return might be used in arbitrary conditional
776 branches so we must force the SAVE_EXPRs evaluation
777 immediately and this requires a function context. */
778 if (!Materialize_Entity (gnat_entity
)
779 && (!global_bindings_p ()
780 || (staticp (gnu_expr
)
781 && !TREE_SIDE_EFFECTS (gnu_expr
))))
784 = maybe_stabilize_reference (gnu_expr
, true, false,
789 gnu_decl
= maybe_stable_expr
;
790 save_gnu_tree (gnat_entity
, gnu_decl
, true);
795 /* The stabilization failed. Keep maybe_stable_expr
796 untouched here to let the pointer case below know
797 about that failure. */
800 /* Case 3: Make this into a constant pointer to the object we
801 are to rename and attach the object to the pointer if it is
802 an lvalue that can be stabilized.
804 From the proper scope, attached objects will be referenced
805 directly instead of indirectly via the pointer to avoid
806 subtle aliasing problems with non addressable entities.
807 They have to be stable because we must not evaluate the
808 variables in the expression every time the renaming is used.
809 They also have to be lvalues because the context in which
810 they are reused sometimes requires so. We call pointers
811 with an attached object "renaming" pointers.
813 In the rare cases where we cannot stabilize the renamed
814 object, we just make a "bare" pointer, and the renamed
815 entity is always accessed indirectly through it. */
817 bool expr_has_side_effects
= TREE_SIDE_EFFECTS (gnu_expr
);
819 inner_const_flag
= TREE_READONLY (gnu_expr
);
821 gnu_type
= build_reference_type (gnu_type
);
823 /* If a previous attempt at unrestricted stabilization
824 failed, there is no point trying again and we can reuse
825 the result without attaching it to the pointer. */
826 if (maybe_stable_expr
)
829 /* Otherwise, try to stabilize now, restricting to
830 lvalues only, and attach the expression to the pointer
831 if the stabilization succeeds.
833 Note that this might introduce SAVE_EXPRs and we don't
834 check whether we're at the global level or not. This is
835 fine since we are building a pointer initializer and
836 neither the pointer nor the initializing expression can
837 be accessed before the pointer elaboration has taken
838 place in a correct program.
840 SAVE_EXPRs will be evaluated at the right spots by either
841 create_var_decl->expand_decl_init for the non-global case
842 or build_unit_elab for the global case, and will be
843 attached to the elaboration procedure by the RTL expander
844 in the latter case. We have no need to force an early
849 = maybe_stabilize_reference (gnu_expr
, true, true,
853 renamed_obj
= maybe_stable_expr
;
854 /* Attaching is actually performed downstream, as soon
855 as we have a DECL for the pointer we make. */
859 = build_unary_op (ADDR_EXPR
, gnu_type
, maybe_stable_expr
);
861 /* If the initial expression has side effects, we might
862 still have an unstabilized version at this point (for
863 instance if it involves a function call). Wrap the
864 result into a SAVE_EXPR now, in case it happens to be
865 referenced several times. */
866 if (expr_has_side_effects
&& ! stabilized
)
867 gnu_expr
= save_expr (gnu_expr
);
869 gnu_size
= NULL_TREE
;
875 /* If this is an aliased object whose nominal subtype is unconstrained,
876 the object is a record that contains both the template and
877 the object. If there is an initializer, it will have already
878 been converted to the right type, but we need to create the
879 template if there is no initializer. */
880 else if (definition
&& TREE_CODE (gnu_type
) == RECORD_TYPE
881 && (TYPE_CONTAINS_TEMPLATE_P (gnu_type
)
882 /* Beware that padding might have been introduced
883 via maybe_pad_type above. */
884 || (TYPE_IS_PADDING_P (gnu_type
)
885 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type
)))
887 && TYPE_CONTAINS_TEMPLATE_P
888 (TREE_TYPE (TYPE_FIELDS (gnu_type
)))))
892 = TYPE_IS_PADDING_P (gnu_type
)
893 ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type
)))
894 : TYPE_FIELDS (gnu_type
);
897 = gnat_build_constructor
901 build_template (TREE_TYPE (template_field
),
902 TREE_TYPE (TREE_CHAIN (template_field
)),
907 /* If this is a pointer and it does not have an initializing
908 expression, initialize it to NULL, unless the object is
911 && (POINTER_TYPE_P (gnu_type
) || TYPE_FAT_POINTER_P (gnu_type
))
912 && !Is_Imported (gnat_entity
) && !gnu_expr
)
913 gnu_expr
= integer_zero_node
;
915 /* If we are defining the object and it has an Address clause we must
916 get the address expression from the saved GCC tree for the
917 object if the object has a Freeze_Node. Otherwise, we elaborate
918 the address expression here since the front-end has guaranteed
919 in that case that the elaboration has no effects. Note that
920 only the latter mechanism is currently in use. */
921 if (definition
&& Present (Address_Clause (gnat_entity
)))
924 = (present_gnu_tree (gnat_entity
) ? get_gnu_tree (gnat_entity
)
925 : gnat_to_gnu (Expression (Address_Clause (gnat_entity
))));
927 save_gnu_tree (gnat_entity
, NULL_TREE
, false);
929 /* Ignore the size. It's either meaningless or was handled
931 gnu_size
= NULL_TREE
;
932 gnu_type
= build_reference_type (gnu_type
);
933 gnu_address
= convert (gnu_type
, gnu_address
);
935 const_flag
= !Is_Public (gnat_entity
);
937 /* If we don't have an initializing expression for the underlying
938 variable, the initializing expression for the pointer is the
939 specified address. Otherwise, we have to make a COMPOUND_EXPR
940 to assign both the address and the initial value. */
942 gnu_expr
= gnu_address
;
945 = build2 (COMPOUND_EXPR
, gnu_type
,
947 (MODIFY_EXPR
, NULL_TREE
,
948 build_unary_op (INDIRECT_REF
, NULL_TREE
,
954 /* If it has an address clause and we are not defining it, mark it
955 as an indirect object. Likewise for Stdcall objects that are
957 if ((!definition
&& Present (Address_Clause (gnat_entity
)))
958 || (Is_Imported (gnat_entity
)
959 && Has_Stdcall_Convention (gnat_entity
)))
961 gnu_type
= build_reference_type (gnu_type
);
962 gnu_size
= NULL_TREE
;
964 gnu_expr
= NULL_TREE
;
965 /* No point in taking the address of an initializing expression
966 that isn't going to be used. */
971 /* If we are at top level and this object is of variable size,
972 make the actual type a hidden pointer to the real type and
973 make the initializer be a memory allocation and initialization.
974 Likewise for objects we aren't defining (presumed to be
975 external references from other packages), but there we do
976 not set up an initialization.
978 If the object's size overflows, make an allocator too, so that
979 Storage_Error gets raised. Note that we will never free
980 such memory, so we presume it never will get allocated. */
982 if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type
),
983 global_bindings_p () || !definition
986 && ! allocatable_size_p (gnu_size
,
987 global_bindings_p () || !definition
990 gnu_type
= build_reference_type (gnu_type
);
991 gnu_size
= NULL_TREE
;
995 /* In case this was a aliased object whose nominal subtype is
996 unconstrained, the pointer above will be a thin pointer and
997 build_allocator will automatically make the template.
999 If we have a template initializer only (that we made above),
1000 pretend there is none and rely on what build_allocator creates
1001 again anyway. Otherwise (if we have a full initializer), get
1002 the data part and feed that to build_allocator.
1004 If we are elaborating a mutable object, tell build_allocator to
1005 ignore a possibly simpler size from the initializer, if any, as
1006 we must allocate the maximum possible size in this case. */
1010 tree gnu_alloc_type
= TREE_TYPE (gnu_type
);
1012 if (TREE_CODE (gnu_alloc_type
) == RECORD_TYPE
1013 && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type
))
1016 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type
)));
1018 if (TREE_CODE (gnu_expr
) == CONSTRUCTOR
1019 && 1 == VEC_length (constructor_elt
,
1020 CONSTRUCTOR_ELTS (gnu_expr
)))
1024 = build_component_ref
1025 (gnu_expr
, NULL_TREE
,
1026 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr
))),
1030 if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type
)) == INTEGER_CST
1031 && TREE_CONSTANT_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type
))
1032 && !Is_Imported (gnat_entity
))
1033 post_error ("Storage_Error will be raised at run-time?",
1036 gnu_expr
= build_allocator (gnu_alloc_type
, gnu_expr
, gnu_type
,
1037 0, 0, gnat_entity
, mutable_p
);
1041 gnu_expr
= NULL_TREE
;
1046 /* If this object would go into the stack and has an alignment
1047 larger than the default largest alignment, make a variable
1048 to hold the "aligning type" with a modified initial value,
1049 if any, then point to it and make that the value of this
1050 variable, which is now indirect. */
1051 if (!global_bindings_p () && !static_p
&& definition
1052 && !imported_p
&& TYPE_ALIGN (gnu_type
) > BIGGEST_ALIGNMENT
)
1055 = make_aligning_type (gnu_type
, TYPE_ALIGN (gnu_type
),
1056 TYPE_SIZE_UNIT (gnu_type
));
1060 = create_var_decl (create_concat_name (gnat_entity
, "ALIGN"),
1061 NULL_TREE
, gnu_new_type
, NULL_TREE
, false,
1062 false, false, false, NULL
, gnat_entity
);
1066 (build_binary_op (MODIFY_EXPR
, NULL_TREE
,
1068 (gnu_new_var
, NULL_TREE
,
1069 TYPE_FIELDS (gnu_new_type
), false),
1073 gnu_type
= build_reference_type (gnu_type
);
1076 (ADDR_EXPR
, gnu_type
,
1077 build_component_ref (gnu_new_var
, NULL_TREE
,
1078 TYPE_FIELDS (gnu_new_type
), false));
1080 gnu_size
= NULL_TREE
;
1086 gnu_type
= build_qualified_type (gnu_type
, (TYPE_QUALS (gnu_type
)
1087 | TYPE_QUAL_CONST
));
1089 /* Convert the expression to the type of the object except in the
1090 case where the object's type is unconstrained or the object's type
1091 is a padded record whose field is of self-referential size. In
1092 the former case, converting will generate unnecessary evaluations
1093 of the CONSTRUCTOR to compute the size and in the latter case, we
1094 want to only copy the actual data. */
1096 && TREE_CODE (gnu_type
) != UNCONSTRAINED_ARRAY_TYPE
1097 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type
))
1098 && !(TREE_CODE (gnu_type
) == RECORD_TYPE
1099 && TYPE_IS_PADDING_P (gnu_type
)
1100 && (CONTAINS_PLACEHOLDER_P
1101 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type
)))))))
1102 gnu_expr
= convert (gnu_type
, gnu_expr
);
1104 /* If this name is external or there was a name specified, use it,
1105 unless this is a VMS exception object since this would conflict
1106 with the symbol we need to export in addition. Don't use the
1107 Interface_Name if there is an address clause (see CD30005). */
1108 if (!Is_VMS_Exception (gnat_entity
)
1109 && ((Present (Interface_Name (gnat_entity
))
1110 && No (Address_Clause (gnat_entity
)))
1111 || (Is_Public (gnat_entity
)
1112 && (!Is_Imported (gnat_entity
)
1113 || Is_Exported (gnat_entity
)))))
1114 gnu_ext_name
= create_concat_name (gnat_entity
, 0);
1116 /* If this is constant initialized to a static constant and the
1117 object has an aggregate type, force it to be statically
1119 if (const_flag
&& gnu_expr
&& TREE_CONSTANT (gnu_expr
)
1120 && host_integerp (TYPE_SIZE_UNIT (gnu_type
), 1)
1121 && (AGGREGATE_TYPE_P (gnu_type
)
1122 && !(TREE_CODE (gnu_type
) == RECORD_TYPE
1123 && TYPE_IS_PADDING_P (gnu_type
))))
1126 gnu_decl
= create_var_decl (gnu_entity_id
, gnu_ext_name
, gnu_type
,
1127 gnu_expr
, const_flag
,
1128 Is_Public (gnat_entity
),
1129 imported_p
|| !definition
,
1130 static_p
, attr_list
, gnat_entity
);
1131 DECL_BY_REF_P (gnu_decl
) = used_by_ref
;
1132 DECL_POINTS_TO_READONLY_P (gnu_decl
) = used_by_ref
&& inner_const_flag
;
1133 if (TREE_CODE (gnu_decl
) == VAR_DECL
&& renamed_obj
)
1135 SET_DECL_RENAMED_OBJECT (gnu_decl
, renamed_obj
);
1136 DECL_RENAMING_GLOBAL_P (gnu_decl
) = global_bindings_p ();
1139 /* If we have an address clause and we've made this indirect, it's
1140 not enough to merely mark the type as volatile since volatile
1141 references only conflict with other volatile references while this
1142 reference must conflict with all other references. So ensure that
1143 the dereferenced value has alias set 0. */
1144 if (Present (Address_Clause (gnat_entity
)) && used_by_ref
)
1145 DECL_POINTER_ALIAS_SET (gnu_decl
) = 0;
1147 if (definition
&& DECL_SIZE (gnu_decl
)
1148 && get_block_jmpbuf_decl ()
1149 && (TREE_CODE (DECL_SIZE (gnu_decl
)) != INTEGER_CST
1150 || (flag_stack_check
&& !STACK_CHECK_BUILTIN
1151 && 0 < compare_tree_int (DECL_SIZE_UNIT (gnu_decl
),
1152 STACK_CHECK_MAX_VAR_SIZE
))))
1153 add_stmt_with_node (build_call_1_expr
1154 (update_setjmp_buf_decl
,
1155 build_unary_op (ADDR_EXPR
, NULL_TREE
,
1156 get_block_jmpbuf_decl ())),
1159 /* If this is a public constant or we're not optimizing and we're not
1160 making a VAR_DECL for it, make one just for export or debugger
1161 use. Likewise if the address is taken or if the object or type is
1163 if (definition
&& TREE_CODE (gnu_decl
) == CONST_DECL
1164 && (Is_Public (gnat_entity
)
1166 || Address_Taken (gnat_entity
)
1167 || Is_Aliased (gnat_entity
)
1168 || Is_Aliased (Etype (gnat_entity
))))
1171 = create_var_decl (gnu_entity_id
, gnu_ext_name
, gnu_type
,
1172 gnu_expr
, false, Is_Public (gnat_entity
),
1173 false, static_p
, NULL
, gnat_entity
);
1175 SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl
, gnu_corr_var
);
1178 /* If this is declared in a block that contains a block with an
1179 exception handler, we must force this variable in memory to
1180 suppress an invalid optimization. */
1181 if (Has_Nested_Block_With_Handler (Scope (gnat_entity
))
1182 && Exception_Mechanism
!= Back_End_Exceptions
)
1183 TREE_ADDRESSABLE (gnu_decl
) = 1;
1185 /* Back-annotate the Alignment of the object if not already in the
1186 tree. Likewise for Esize if the object is of a constant size.
1187 But if the "object" is actually a pointer to an object, the
1188 alignment and size are the same as the type, so don't back-annotate
1189 the values for the pointer. */
1190 if (!used_by_ref
&& Unknown_Alignment (gnat_entity
))
1191 Set_Alignment (gnat_entity
,
1192 UI_From_Int (DECL_ALIGN (gnu_decl
) / BITS_PER_UNIT
));
1194 if (!used_by_ref
&& Unknown_Esize (gnat_entity
)
1195 && DECL_SIZE (gnu_decl
))
1197 tree gnu_back_size
= DECL_SIZE (gnu_decl
);
1199 if (TREE_CODE (TREE_TYPE (gnu_decl
)) == RECORD_TYPE
1200 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_decl
)))
1202 = TYPE_SIZE (TREE_TYPE (TREE_CHAIN
1203 (TYPE_FIELDS (TREE_TYPE (gnu_decl
)))));
1205 Set_Esize (gnat_entity
, annotate_value (gnu_back_size
));
1211 /* Return a TYPE_DECL for "void" that we previously made. */
1212 gnu_decl
= void_type_decl_node
;
1215 case E_Enumeration_Type
:
1216 /* A special case, for the types Character and Wide_Character in
1217 Standard, we do not list all the literals. So if the literals
1218 are not specified, make this an unsigned type. */
1219 if (No (First_Literal (gnat_entity
)))
1221 gnu_type
= make_unsigned_type (esize
);
1225 /* Normal case of non-character type, or non-Standard character type */
1227 /* Here we have a list of enumeral constants in First_Literal.
1228 We make a CONST_DECL for each and build into GNU_LITERAL_LIST
1229 the list to be places into TYPE_FIELDS. Each node in the list
1230 is a TREE_LIST node whose TREE_VALUE is the literal name
1231 and whose TREE_PURPOSE is the value of the literal.
1233 Esize contains the number of bits needed to represent the enumeral
1234 type, Type_Low_Bound also points to the first literal and
1235 Type_High_Bound points to the last literal. */
1237 Entity_Id gnat_literal
;
1238 tree gnu_literal_list
= NULL_TREE
;
1240 if (Is_Unsigned_Type (gnat_entity
))
1241 gnu_type
= make_unsigned_type (esize
);
1243 gnu_type
= make_signed_type (esize
);
1245 TREE_SET_CODE (gnu_type
, ENUMERAL_TYPE
);
1247 for (gnat_literal
= First_Literal (gnat_entity
);
1248 Present (gnat_literal
);
1249 gnat_literal
= Next_Literal (gnat_literal
))
1251 tree gnu_value
= UI_To_gnu (Enumeration_Rep (gnat_literal
),
1254 = create_var_decl (get_entity_name (gnat_literal
), NULL_TREE
,
1255 gnu_type
, gnu_value
, true, false, false,
1256 false, NULL
, gnat_literal
);
1258 save_gnu_tree (gnat_literal
, gnu_literal
, false);
1259 gnu_literal_list
= tree_cons (DECL_NAME (gnu_literal
),
1260 gnu_value
, gnu_literal_list
);
1263 TYPE_VALUES (gnu_type
) = nreverse (gnu_literal_list
);
1265 /* Note that the bounds are updated at the end of this function
1266 because to avoid an infinite recursion when we get the bounds of
1267 this type, since those bounds are objects of this type. */
1271 case E_Signed_Integer_Type
:
1272 case E_Ordinary_Fixed_Point_Type
:
1273 case E_Decimal_Fixed_Point_Type
:
1274 /* For integer types, just make a signed type the appropriate number
1276 gnu_type
= make_signed_type (esize
);
1279 case E_Modular_Integer_Type
:
1280 /* For modular types, make the unsigned type of the proper number of
1281 bits and then set up the modulus, if required. */
1283 enum machine_mode mode
;
1287 if (Is_Packed_Array_Type (gnat_entity
))
1288 esize
= UI_To_Int (RM_Size (gnat_entity
));
1290 /* Find the smallest mode at least ESIZE bits wide and make a class
1293 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
1294 GET_MODE_BITSIZE (mode
) < esize
;
1295 mode
= GET_MODE_WIDER_MODE (mode
))
1298 gnu_type
= make_unsigned_type (GET_MODE_BITSIZE (mode
));
1299 TYPE_PACKED_ARRAY_TYPE_P (gnu_type
)
1300 = Is_Packed_Array_Type (gnat_entity
);
1302 /* Get the modulus in this type. If it overflows, assume it is because
1303 it is equal to 2**Esize. Note that there is no overflow checking
1304 done on unsigned type, so we detect the overflow by looking for
1305 a modulus of zero, which is otherwise invalid. */
1306 gnu_modulus
= UI_To_gnu (Modulus (gnat_entity
), gnu_type
);
1308 if (!integer_zerop (gnu_modulus
))
1310 TYPE_MODULAR_P (gnu_type
) = 1;
1311 SET_TYPE_MODULUS (gnu_type
, gnu_modulus
);
1312 gnu_high
= fold (build2 (MINUS_EXPR
, gnu_type
, gnu_modulus
,
1313 convert (gnu_type
, integer_one_node
)));
1316 /* If we have to set TYPE_PRECISION different from its natural value,
1317 make a subtype to do do. Likewise if there is a modulus and
1318 it is not one greater than TYPE_MAX_VALUE. */
1319 if (TYPE_PRECISION (gnu_type
) != esize
1320 || (TYPE_MODULAR_P (gnu_type
)
1321 && !tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type
), gnu_high
)))
1323 tree gnu_subtype
= make_node (INTEGER_TYPE
);
1325 TYPE_NAME (gnu_type
) = create_concat_name (gnat_entity
, "UMT");
1326 TREE_TYPE (gnu_subtype
) = gnu_type
;
1327 TYPE_MIN_VALUE (gnu_subtype
) = TYPE_MIN_VALUE (gnu_type
);
1328 TYPE_MAX_VALUE (gnu_subtype
)
1329 = TYPE_MODULAR_P (gnu_type
)
1330 ? gnu_high
: TYPE_MAX_VALUE (gnu_type
);
1331 TYPE_PRECISION (gnu_subtype
) = esize
;
1332 TYPE_UNSIGNED (gnu_subtype
) = 1;
1333 TYPE_EXTRA_SUBTYPE_P (gnu_subtype
) = 1;
1334 TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype
)
1335 = Is_Packed_Array_Type (gnat_entity
);
1336 layout_type (gnu_subtype
);
1338 gnu_type
= gnu_subtype
;
1343 case E_Signed_Integer_Subtype
:
1344 case E_Enumeration_Subtype
:
1345 case E_Modular_Integer_Subtype
:
1346 case E_Ordinary_Fixed_Point_Subtype
:
1347 case E_Decimal_Fixed_Point_Subtype
:
1349 /* For integral subtypes, we make a new INTEGER_TYPE. Note
1350 that we do not want to call build_range_type since we would
1351 like each subtype node to be distinct. This will be important
1352 when memory aliasing is implemented.
1354 The TREE_TYPE field of the INTEGER_TYPE we make points to the
1355 parent type; this fact is used by the arithmetic conversion
1358 We elaborate the Ancestor_Subtype if it is not in the current
1359 unit and one of our bounds is non-static. We do this to ensure
1360 consistent naming in the case where several subtypes share the same
1361 bounds by always elaborating the first such subtype first, thus
1365 && Present (Ancestor_Subtype (gnat_entity
))
1366 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity
))
1367 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity
))
1368 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity
))))
1369 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity
),
1370 gnu_expr
, definition
);
1372 gnu_type
= make_node (INTEGER_TYPE
);
1373 if (Is_Packed_Array_Type (gnat_entity
))
1375 esize
= UI_To_Int (RM_Size (gnat_entity
));
1376 TYPE_PACKED_ARRAY_TYPE_P (gnu_type
) = 1;
1379 TYPE_PRECISION (gnu_type
) = esize
;
1380 TREE_TYPE (gnu_type
) = get_unpadded_type (Etype (gnat_entity
));
1382 TYPE_MIN_VALUE (gnu_type
)
1383 = convert (TREE_TYPE (gnu_type
),
1384 elaborate_expression (Type_Low_Bound (gnat_entity
),
1386 get_identifier ("L"), definition
, 1,
1387 Needs_Debug_Info (gnat_entity
)));
1389 TYPE_MAX_VALUE (gnu_type
)
1390 = convert (TREE_TYPE (gnu_type
),
1391 elaborate_expression (Type_High_Bound (gnat_entity
),
1393 get_identifier ("U"), definition
, 1,
1394 Needs_Debug_Info (gnat_entity
)));
1396 /* One of the above calls might have caused us to be elaborated,
1397 so don't blow up if so. */
1398 if (present_gnu_tree (gnat_entity
))
1400 maybe_present
= true;
1404 TYPE_BIASED_REPRESENTATION_P (gnu_type
)
1405 = Has_Biased_Representation (gnat_entity
);
1407 /* This should be an unsigned type if the lower bound is constant
1408 and non-negative or if the base type is unsigned; a signed type
1410 TYPE_UNSIGNED (gnu_type
)
1411 = (TYPE_UNSIGNED (TREE_TYPE (gnu_type
))
1412 || (TREE_CODE (TYPE_MIN_VALUE (gnu_type
)) == INTEGER_CST
1413 && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type
)) >= 0)
1414 || TYPE_BIASED_REPRESENTATION_P (gnu_type
)
1415 || Is_Unsigned_Type (gnat_entity
));
1417 layout_type (gnu_type
);
1419 /* Inherit our alias set from what we're a subtype of. Subtypes
1420 are not different types and a pointer can designate any instance
1421 within a subtype hierarchy. */
1422 copy_alias_set (gnu_type
, TREE_TYPE (gnu_type
));
1424 /* If the type we are dealing with is to represent a packed array,
1425 we need to have the bits left justified on big-endian targets
1426 and right justified on little-endian targets. We also need to
1427 ensure that when the value is read (e.g. for comparison of two
1428 such values), we only get the good bits, since the unused bits
1429 are uninitialized. Both goals are accomplished by wrapping the
1430 modular value in an enclosing struct. */
1431 if (Is_Packed_Array_Type (gnat_entity
))
1433 tree gnu_field_type
= gnu_type
;
1436 TYPE_RM_SIZE_NUM (gnu_field_type
)
1437 = UI_To_gnu (RM_Size (gnat_entity
), bitsizetype
);
1438 gnu_type
= make_node (RECORD_TYPE
);
1439 TYPE_NAME (gnu_type
) = create_concat_name (gnat_entity
, "JM");
1440 TYPE_ALIGN (gnu_type
) = TYPE_ALIGN (gnu_field_type
);
1441 TYPE_PACKED (gnu_type
) = 1;
1443 /* Create a stripped-down declaration of the original type, mainly
1445 create_type_decl (get_entity_name (gnat_entity
), gnu_field_type
,
1446 NULL
, true, debug_info_p
, gnat_entity
);
1448 /* Don't notify the field as "addressable", since we won't be taking
1449 it's address and it would prevent create_field_decl from making a
1451 gnu_field
= create_field_decl (get_identifier ("OBJECT"),
1452 gnu_field_type
, gnu_type
, 1, 0, 0, 0);
1454 finish_record_type (gnu_type
, gnu_field
, false, false);
1455 TYPE_JUSTIFIED_MODULAR_P (gnu_type
) = 1;
1456 SET_TYPE_ADA_SIZE (gnu_type
, bitsize_int (esize
));
1458 copy_alias_set (gnu_type
, gnu_field_type
);
1463 case E_Floating_Point_Type
:
1464 /* If this is a VAX floating-point type, use an integer of the proper
1465 size. All the operations will be handled with ASM statements. */
1466 if (Vax_Float (gnat_entity
))
1468 gnu_type
= make_signed_type (esize
);
1469 TYPE_VAX_FLOATING_POINT_P (gnu_type
) = 1;
1470 SET_TYPE_DIGITS_VALUE (gnu_type
,
1471 UI_To_gnu (Digits_Value (gnat_entity
),
1476 /* The type of the Low and High bounds can be our type if this is
1477 a type from Standard, so set them at the end of the function. */
1478 gnu_type
= make_node (REAL_TYPE
);
1479 TYPE_PRECISION (gnu_type
) = fp_size_to_prec (esize
);
1480 layout_type (gnu_type
);
1483 case E_Floating_Point_Subtype
:
1484 if (Vax_Float (gnat_entity
))
1486 gnu_type
= gnat_to_gnu_type (Etype (gnat_entity
));
1492 && Present (Ancestor_Subtype (gnat_entity
))
1493 && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity
))
1494 && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity
))
1495 || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity
))))
1496 gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity
),
1497 gnu_expr
, definition
);
1499 gnu_type
= make_node (REAL_TYPE
);
1500 TREE_TYPE (gnu_type
) = get_unpadded_type (Etype (gnat_entity
));
1501 TYPE_PRECISION (gnu_type
) = fp_size_to_prec (esize
);
1503 TYPE_MIN_VALUE (gnu_type
)
1504 = convert (TREE_TYPE (gnu_type
),
1505 elaborate_expression (Type_Low_Bound (gnat_entity
),
1506 gnat_entity
, get_identifier ("L"),
1508 Needs_Debug_Info (gnat_entity
)));
1510 TYPE_MAX_VALUE (gnu_type
)
1511 = convert (TREE_TYPE (gnu_type
),
1512 elaborate_expression (Type_High_Bound (gnat_entity
),
1513 gnat_entity
, get_identifier ("U"),
1515 Needs_Debug_Info (gnat_entity
)));
1517 /* One of the above calls might have caused us to be elaborated,
1518 so don't blow up if so. */
1519 if (present_gnu_tree (gnat_entity
))
1521 maybe_present
= true;
1525 layout_type (gnu_type
);
1527 /* Inherit our alias set from what we're a subtype of, as for
1528 integer subtypes. */
1529 copy_alias_set (gnu_type
, TREE_TYPE (gnu_type
));
1533 /* Array and String Types and Subtypes
1535 Unconstrained array types are represented by E_Array_Type and
1536 constrained array types are represented by E_Array_Subtype. There
1537 are no actual objects of an unconstrained array type; all we have
1538 are pointers to that type.
1540 The following fields are defined on array types and subtypes:
1542 Component_Type Component type of the array.
1543 Number_Dimensions Number of dimensions (an int).
1544 First_Index Type of first index. */
1549 tree gnu_template_fields
= NULL_TREE
;
1550 tree gnu_template_type
= make_node (RECORD_TYPE
);
1551 tree gnu_ptr_template
= build_pointer_type (gnu_template_type
);
1552 tree gnu_fat_type
= make_node (RECORD_TYPE
);
1553 int ndim
= Number_Dimensions (gnat_entity
);
1555 = (Convention (gnat_entity
) == Convention_Fortran
) ? ndim
- 1 : 0;
1557 = (Convention (gnat_entity
) == Convention_Fortran
) ? - 1 : 1;
1558 tree
*gnu_index_types
= (tree
*) alloca (ndim
* sizeof (tree
*));
1559 tree
*gnu_temp_fields
= (tree
*) alloca (ndim
* sizeof (tree
*));
1560 tree gnu_comp_size
= 0;
1561 tree gnu_max_size
= size_one_node
;
1562 tree gnu_max_size_unit
;
1564 Entity_Id gnat_ind_subtype
;
1565 Entity_Id gnat_ind_base_subtype
;
1566 tree gnu_template_reference
;
1569 TYPE_NAME (gnu_template_type
)
1570 = create_concat_name (gnat_entity
, "XUB");
1571 TYPE_NAME (gnu_fat_type
) = create_concat_name (gnat_entity
, "XUP");
1572 TYPE_IS_FAT_POINTER_P (gnu_fat_type
) = 1;
1573 TYPE_READONLY (gnu_template_type
) = 1;
1575 /* Make a node for the array. If we are not defining the array
1576 suppress expanding incomplete types. */
1577 gnu_type
= make_node (UNCONSTRAINED_ARRAY_TYPE
);
1580 defer_incomplete_level
++, this_deferred
= true;
1582 /* Build the fat pointer type. Use a "void *" object instead of
1583 a pointer to the array type since we don't have the array type
1584 yet (it will reference the fat pointer via the bounds). */
1585 tem
= chainon (chainon (NULL_TREE
,
1586 create_field_decl (get_identifier ("P_ARRAY"),
1588 gnu_fat_type
, 0, 0, 0, 0)),
1589 create_field_decl (get_identifier ("P_BOUNDS"),
1591 gnu_fat_type
, 0, 0, 0, 0));
1593 /* Make sure we can put this into a register. */
1594 TYPE_ALIGN (gnu_fat_type
) = MIN (BIGGEST_ALIGNMENT
, 2 * POINTER_SIZE
);
1595 finish_record_type (gnu_fat_type
, tem
, false, true);
1597 /* Build a reference to the template from a PLACEHOLDER_EXPR that
1598 is the fat pointer. This will be used to access the individual
1599 fields once we build them. */
1600 tem
= build3 (COMPONENT_REF
, gnu_ptr_template
,
1601 build0 (PLACEHOLDER_EXPR
, gnu_fat_type
),
1602 TREE_CHAIN (TYPE_FIELDS (gnu_fat_type
)), NULL_TREE
);
1603 gnu_template_reference
1604 = build_unary_op (INDIRECT_REF
, gnu_template_type
, tem
);
1605 TREE_READONLY (gnu_template_reference
) = 1;
1607 /* Now create the GCC type for each index and add the fields for
1608 that index to the template. */
1609 for (index
= firstdim
, gnat_ind_subtype
= First_Index (gnat_entity
),
1610 gnat_ind_base_subtype
1611 = First_Index (Implementation_Base_Type (gnat_entity
));
1612 index
< ndim
&& index
>= 0;
1614 gnat_ind_subtype
= Next_Index (gnat_ind_subtype
),
1615 gnat_ind_base_subtype
= Next_Index (gnat_ind_base_subtype
))
1617 char field_name
[10];
1618 tree gnu_ind_subtype
1619 = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype
)));
1620 tree gnu_base_subtype
1621 = get_unpadded_type (Etype (gnat_ind_base_subtype
));
1623 = convert (sizetype
, TYPE_MIN_VALUE (gnu_base_subtype
));
1625 = convert (sizetype
, TYPE_MAX_VALUE (gnu_base_subtype
));
1626 tree gnu_min_field
, gnu_max_field
, gnu_min
, gnu_max
;
1628 /* Make the FIELD_DECLs for the minimum and maximum of this
1629 type and then make extractions of that field from the
1631 sprintf (field_name
, "LB%d", index
);
1632 gnu_min_field
= create_field_decl (get_identifier (field_name
),
1634 gnu_template_type
, 0, 0, 0, 0);
1635 field_name
[0] = 'U';
1636 gnu_max_field
= create_field_decl (get_identifier (field_name
),
1638 gnu_template_type
, 0, 0, 0, 0);
1640 Sloc_to_locus (Sloc (gnat_entity
),
1641 &DECL_SOURCE_LOCATION (gnu_min_field
));
1642 Sloc_to_locus (Sloc (gnat_entity
),
1643 &DECL_SOURCE_LOCATION (gnu_max_field
));
1644 gnu_temp_fields
[index
] = chainon (gnu_min_field
, gnu_max_field
);
1646 /* We can't use build_component_ref here since the template
1647 type isn't complete yet. */
1648 gnu_min
= build3 (COMPONENT_REF
, gnu_ind_subtype
,
1649 gnu_template_reference
, gnu_min_field
,
1651 gnu_max
= build3 (COMPONENT_REF
, gnu_ind_subtype
,
1652 gnu_template_reference
, gnu_max_field
,
1654 TREE_READONLY (gnu_min
) = TREE_READONLY (gnu_max
) = 1;
1656 /* Make a range type with the new ranges, but using
1657 the Ada subtype. Then we convert to sizetype. */
1658 gnu_index_types
[index
]
1659 = create_index_type (convert (sizetype
, gnu_min
),
1660 convert (sizetype
, gnu_max
),
1661 build_range_type (gnu_ind_subtype
,
1663 /* Update the maximum size of the array, in elements. */
1665 = size_binop (MULT_EXPR
, gnu_max_size
,
1666 size_binop (PLUS_EXPR
, size_one_node
,
1667 size_binop (MINUS_EXPR
, gnu_base_max
,
1670 TYPE_NAME (gnu_index_types
[index
])
1671 = create_concat_name (gnat_entity
, field_name
);
1674 for (index
= 0; index
< ndim
; index
++)
1676 = chainon (gnu_template_fields
, gnu_temp_fields
[index
]);
1678 /* Install all the fields into the template. */
1679 finish_record_type (gnu_template_type
, gnu_template_fields
,
1681 TYPE_READONLY (gnu_template_type
) = 1;
1683 /* Now make the array of arrays and update the pointer to the array
1684 in the fat pointer. Note that it is the first field. */
1686 tem
= gnat_to_gnu_type (Component_Type (gnat_entity
));
1688 /* Get and validate any specified Component_Size, but if Packed,
1689 ignore it since the front end will have taken care of it. */
1691 = validate_size (Component_Size (gnat_entity
), tem
,
1693 (Is_Bit_Packed_Array (gnat_entity
)
1694 ? TYPE_DECL
: VAR_DECL
),
1695 true, Has_Component_Size_Clause (gnat_entity
));
1697 if (Has_Atomic_Components (gnat_entity
))
1698 check_ok_for_atomic (tem
, gnat_entity
, true);
1700 /* If the component type is a RECORD_TYPE that has a self-referential
1701 size, use the maxium size. */
1702 if (!gnu_comp_size
&& TREE_CODE (tem
) == RECORD_TYPE
1703 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem
)))
1704 gnu_comp_size
= max_size (TYPE_SIZE (tem
), true);
1706 if (!Is_Bit_Packed_Array (gnat_entity
) && gnu_comp_size
)
1708 tem
= make_type_from_size (tem
, gnu_comp_size
, false);
1709 tem
= maybe_pad_type (tem
, gnu_comp_size
, 0, gnat_entity
,
1710 "C_PAD", false, definition
, true);
1713 if (Has_Volatile_Components (gnat_entity
))
1714 tem
= build_qualified_type (tem
,
1715 TYPE_QUALS (tem
) | TYPE_QUAL_VOLATILE
);
1717 /* If Component_Size is not already specified, annotate it with the
1718 size of the component. */
1719 if (Unknown_Component_Size (gnat_entity
))
1720 Set_Component_Size (gnat_entity
, annotate_value (TYPE_SIZE (tem
)));
1722 gnu_max_size_unit
= size_binop (MAX_EXPR
, size_zero_node
,
1723 size_binop (MULT_EXPR
, gnu_max_size
,
1724 TYPE_SIZE_UNIT (tem
)));
1725 gnu_max_size
= size_binop (MAX_EXPR
, bitsize_zero_node
,
1726 size_binop (MULT_EXPR
,
1727 convert (bitsizetype
,
1731 for (index
= ndim
- 1; index
>= 0; index
--)
1733 tem
= build_array_type (tem
, gnu_index_types
[index
]);
1734 TYPE_MULTI_ARRAY_P (tem
) = (index
> 0);
1736 /* If the type below this an multi-array type, then this
1737 does not not have aliased components.
1739 ??? Otherwise, for now, we say that any component of aggregate
1740 type is addressable because the front end may take 'Reference
1741 of it. But we have to make it addressable if it must be passed
1742 by reference or it that is the default. */
1743 TYPE_NONALIASED_COMPONENT (tem
)
1744 = ((TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
1745 && TYPE_MULTI_ARRAY_P (TREE_TYPE (tem
))) ? 1
1746 : (!Has_Aliased_Components (gnat_entity
)
1747 && !AGGREGATE_TYPE_P (TREE_TYPE (tem
))));
1750 /* If an alignment is specified, use it if valid. But ignore it for
1751 types that represent the unpacked base type for packed arrays. */
1752 if (No (Packed_Array_Type (gnat_entity
))
1753 && Known_Alignment (gnat_entity
))
1755 gcc_assert (Present (Alignment (gnat_entity
)));
1757 = validate_alignment (Alignment (gnat_entity
), gnat_entity
,
1761 TYPE_CONVENTION_FORTRAN_P (tem
)
1762 = (Convention (gnat_entity
) == Convention_Fortran
);
1763 TREE_TYPE (TYPE_FIELDS (gnu_fat_type
)) = build_pointer_type (tem
);
1765 /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the
1766 corresponding fat pointer. */
1767 TREE_TYPE (gnu_type
) = TYPE_POINTER_TO (gnu_type
)
1768 = TYPE_REFERENCE_TO (gnu_type
) = gnu_fat_type
;
1769 TYPE_MODE (gnu_type
) = BLKmode
;
1770 TYPE_ALIGN (gnu_type
) = TYPE_ALIGN (tem
);
1771 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type
, gnu_type
);
1773 /* If the maximum size doesn't overflow, use it. */
1774 if (TREE_CODE (gnu_max_size
) == INTEGER_CST
1775 && !TREE_OVERFLOW (gnu_max_size
))
1777 = size_binop (MIN_EXPR
, gnu_max_size
, TYPE_SIZE (tem
));
1778 if (TREE_CODE (gnu_max_size_unit
) == INTEGER_CST
1779 && !TREE_OVERFLOW (gnu_max_size_unit
))
1780 TYPE_SIZE_UNIT (tem
)
1781 = size_binop (MIN_EXPR
, gnu_max_size_unit
,
1782 TYPE_SIZE_UNIT (tem
));
1784 create_type_decl (create_concat_name (gnat_entity
, "XUA"),
1785 tem
, NULL
, !Comes_From_Source (gnat_entity
),
1786 debug_info_p
, gnat_entity
);
1788 /* Create a record type for the object and its template and
1789 set the template at a negative offset. */
1790 tem
= build_unc_object_type (gnu_template_type
, tem
,
1791 create_concat_name (gnat_entity
, "XUT"));
1792 DECL_FIELD_OFFSET (TYPE_FIELDS (tem
))
1793 = size_binop (MINUS_EXPR
, size_zero_node
,
1794 byte_position (TREE_CHAIN (TYPE_FIELDS (tem
))));
1795 DECL_FIELD_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem
))) = size_zero_node
;
1796 DECL_FIELD_BIT_OFFSET (TREE_CHAIN (TYPE_FIELDS (tem
)))
1797 = bitsize_zero_node
;
1798 SET_TYPE_UNCONSTRAINED_ARRAY (tem
, gnu_type
);
1799 TYPE_OBJECT_RECORD_TYPE (gnu_type
) = tem
;
1801 /* Give the thin pointer type a name. */
1802 create_type_decl (create_concat_name (gnat_entity
, "XUX"),
1803 build_pointer_type (tem
), NULL
,
1804 !Comes_From_Source (gnat_entity
), debug_info_p
,
1809 case E_String_Subtype
:
1810 case E_Array_Subtype
:
1812 /* This is the actual data type for array variables. Multidimensional
1813 arrays are implemented in the gnu tree as arrays of arrays. Note
1814 that for the moment arrays which have sparse enumeration subtypes as
1815 index components create sparse arrays, which is obviously space
1816 inefficient but so much easier to code for now.
1818 Also note that the subtype never refers to the unconstrained
1819 array type, which is somewhat at variance with Ada semantics.
1821 First check to see if this is simply a renaming of the array
1822 type. If so, the result is the array type. */
1824 gnu_type
= gnat_to_gnu_type (Etype (gnat_entity
));
1825 if (!Is_Constrained (gnat_entity
))
1830 int array_dim
= Number_Dimensions (gnat_entity
);
1832 = ((Convention (gnat_entity
) == Convention_Fortran
)
1833 ? array_dim
- 1 : 0);
1835 = (Convention (gnat_entity
) == Convention_Fortran
) ? -1 : 1;
1836 Entity_Id gnat_ind_subtype
;
1837 Entity_Id gnat_ind_base_subtype
;
1838 tree gnu_base_type
= gnu_type
;
1839 tree
*gnu_index_type
= (tree
*) alloca (array_dim
* sizeof (tree
*));
1840 tree gnu_comp_size
= NULL_TREE
;
1841 tree gnu_max_size
= size_one_node
;
1842 tree gnu_max_size_unit
;
1843 bool need_index_type_struct
= false;
1844 bool max_overflow
= false;
1846 /* First create the gnu types for each index. Create types for
1847 debugging information to point to the index types if the
1848 are not integer types, have variable bounds, or are
1849 wider than sizetype. */
1851 for (index
= first_dim
, gnat_ind_subtype
= First_Index (gnat_entity
),
1852 gnat_ind_base_subtype
1853 = First_Index (Implementation_Base_Type (gnat_entity
));
1854 index
< array_dim
&& index
>= 0;
1856 gnat_ind_subtype
= Next_Index (gnat_ind_subtype
),
1857 gnat_ind_base_subtype
= Next_Index (gnat_ind_base_subtype
))
1859 tree gnu_index_subtype
1860 = get_unpadded_type (Etype (gnat_ind_subtype
));
1862 = convert (sizetype
, TYPE_MIN_VALUE (gnu_index_subtype
));
1864 = convert (sizetype
, TYPE_MAX_VALUE (gnu_index_subtype
));
1865 tree gnu_base_subtype
1866 = get_unpadded_type (Etype (gnat_ind_base_subtype
));
1868 = convert (sizetype
, TYPE_MIN_VALUE (gnu_base_subtype
));
1870 = convert (sizetype
, TYPE_MAX_VALUE (gnu_base_subtype
));
1871 tree gnu_base_type
= get_base_type (gnu_base_subtype
);
1872 tree gnu_base_base_min
1873 = convert (sizetype
, TYPE_MIN_VALUE (gnu_base_type
));
1874 tree gnu_base_base_max
1875 = convert (sizetype
, TYPE_MAX_VALUE (gnu_base_type
));
1879 /* If the minimum and maximum values both overflow in
1880 SIZETYPE, but the difference in the original type
1881 does not overflow in SIZETYPE, ignore the overflow
1883 if ((TYPE_PRECISION (gnu_index_subtype
)
1884 > TYPE_PRECISION (sizetype
)
1885 || TYPE_UNSIGNED (gnu_index_subtype
)
1886 != TYPE_UNSIGNED (sizetype
))
1887 && TREE_CODE (gnu_min
) == INTEGER_CST
1888 && TREE_CODE (gnu_max
) == INTEGER_CST
1889 && TREE_OVERFLOW (gnu_min
) && TREE_OVERFLOW (gnu_max
)
1891 (fold (build2 (MINUS_EXPR
, gnu_index_subtype
,
1892 TYPE_MAX_VALUE (gnu_index_subtype
),
1893 TYPE_MIN_VALUE (gnu_index_subtype
))))))
1894 TREE_OVERFLOW (gnu_min
) = TREE_OVERFLOW (gnu_max
)
1895 = TREE_CONSTANT_OVERFLOW (gnu_min
)
1896 = TREE_CONSTANT_OVERFLOW (gnu_max
) = 0;
1898 /* Similarly, if the range is null, use bounds of 1..0 for
1899 the sizetype bounds. */
1900 else if ((TYPE_PRECISION (gnu_index_subtype
)
1901 > TYPE_PRECISION (sizetype
)
1902 || TYPE_UNSIGNED (gnu_index_subtype
)
1903 != TYPE_UNSIGNED (sizetype
))
1904 && TREE_CODE (gnu_min
) == INTEGER_CST
1905 && TREE_CODE (gnu_max
) == INTEGER_CST
1906 && (TREE_OVERFLOW (gnu_min
) || TREE_OVERFLOW (gnu_max
))
1907 && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype
),
1908 TYPE_MIN_VALUE (gnu_index_subtype
)))
1909 gnu_min
= size_one_node
, gnu_max
= size_zero_node
;
1911 /* Now compute the size of this bound. We need to provide
1912 GCC with an upper bound to use but have to deal with the
1913 "superflat" case. There are three ways to do this. If we
1914 can prove that the array can never be superflat, we can
1915 just use the high bound of the index subtype. If we can
1916 prove that the low bound minus one can't overflow, we
1917 can do this as MAX (hb, lb - 1). Otherwise, we have to use
1918 the expression hb >= lb ? hb : lb - 1. */
1919 gnu_high
= size_binop (MINUS_EXPR
, gnu_min
, size_one_node
);
1921 /* See if the base array type is already flat. If it is, we
1922 are probably compiling an ACVC test, but it will cause the
1923 code below to malfunction if we don't handle it specially. */
1924 if (TREE_CODE (gnu_base_min
) == INTEGER_CST
1925 && TREE_CODE (gnu_base_max
) == INTEGER_CST
1926 && !TREE_CONSTANT_OVERFLOW (gnu_base_min
)
1927 && !TREE_CONSTANT_OVERFLOW (gnu_base_max
)
1928 && tree_int_cst_lt (gnu_base_max
, gnu_base_min
))
1929 gnu_high
= size_zero_node
, gnu_min
= size_one_node
;
1931 /* If gnu_high is now an integer which overflowed, the array
1932 cannot be superflat. */
1933 else if (TREE_CODE (gnu_high
) == INTEGER_CST
1934 && TREE_OVERFLOW (gnu_high
))
1936 else if (TYPE_UNSIGNED (gnu_base_subtype
)
1937 || TREE_CODE (gnu_high
) == INTEGER_CST
)
1938 gnu_high
= size_binop (MAX_EXPR
, gnu_max
, gnu_high
);
1942 (sizetype
, build_binary_op (GE_EXPR
, integer_type_node
,
1946 gnu_index_type
[index
]
1947 = create_index_type (gnu_min
, gnu_high
, gnu_index_subtype
);
1949 /* Also compute the maximum size of the array. Here we
1950 see if any constraint on the index type of the base type
1951 can be used in the case of self-referential bound on
1952 the index type of the subtype. We look for a non-"infinite"
1953 and non-self-referential bound from any type involved and
1954 handle each bound separately. */
1956 if ((TREE_CODE (gnu_min
) == INTEGER_CST
1957 && !TREE_OVERFLOW (gnu_min
)
1958 && !operand_equal_p (gnu_min
, gnu_base_base_min
, 0))
1959 || !CONTAINS_PLACEHOLDER_P (gnu_min
))
1960 gnu_base_min
= gnu_min
;
1962 if ((TREE_CODE (gnu_max
) == INTEGER_CST
1963 && !TREE_OVERFLOW (gnu_max
)
1964 && !operand_equal_p (gnu_max
, gnu_base_base_max
, 0))
1965 || !CONTAINS_PLACEHOLDER_P (gnu_max
))
1966 gnu_base_max
= gnu_max
;
1968 if ((TREE_CODE (gnu_base_min
) == INTEGER_CST
1969 && TREE_CONSTANT_OVERFLOW (gnu_base_min
))
1970 || operand_equal_p (gnu_base_min
, gnu_base_base_min
, 0)
1971 || (TREE_CODE (gnu_base_max
) == INTEGER_CST
1972 && TREE_CONSTANT_OVERFLOW (gnu_base_max
))
1973 || operand_equal_p (gnu_base_max
, gnu_base_base_max
, 0))
1974 max_overflow
= true;
1976 gnu_base_min
= size_binop (MAX_EXPR
, gnu_base_min
, gnu_min
);
1977 gnu_base_max
= size_binop (MIN_EXPR
, gnu_base_max
, gnu_max
);
1980 = size_binop (MAX_EXPR
,
1981 size_binop (PLUS_EXPR
, size_one_node
,
1982 size_binop (MINUS_EXPR
, gnu_base_max
,
1986 if (TREE_CODE (gnu_this_max
) == INTEGER_CST
1987 && TREE_CONSTANT_OVERFLOW (gnu_this_max
))
1988 max_overflow
= true;
1991 = size_binop (MULT_EXPR
, gnu_max_size
, gnu_this_max
);
1993 if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype
))
1994 || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype
))
1996 || TREE_CODE (gnu_index_subtype
) != INTEGER_TYPE
1997 || (TREE_TYPE (gnu_index_subtype
)
1998 && (TREE_CODE (TREE_TYPE (gnu_index_subtype
))
2000 || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype
)
2001 || (TYPE_PRECISION (gnu_index_subtype
)
2002 > TYPE_PRECISION (sizetype
)))
2003 need_index_type_struct
= true;
2006 /* Then flatten: create the array of arrays. */
2008 gnu_type
= gnat_to_gnu_type (Component_Type (gnat_entity
));
2010 /* One of the above calls might have caused us to be elaborated,
2011 so don't blow up if so. */
2012 if (present_gnu_tree (gnat_entity
))
2014 maybe_present
= true;
2018 /* Get and validate any specified Component_Size, but if Packed,
2019 ignore it since the front end will have taken care of it. */
2021 = validate_size (Component_Size (gnat_entity
), gnu_type
,
2023 (Is_Bit_Packed_Array (gnat_entity
)
2024 ? TYPE_DECL
: VAR_DECL
),
2025 true, Has_Component_Size_Clause (gnat_entity
));
2027 /* If the component type is a RECORD_TYPE that has a self-referential
2028 size, use the maxium size. */
2029 if (!gnu_comp_size
&& TREE_CODE (gnu_type
) == RECORD_TYPE
2030 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type
)))
2031 gnu_comp_size
= max_size (TYPE_SIZE (gnu_type
), true);
2033 if (!Is_Bit_Packed_Array (gnat_entity
) && gnu_comp_size
)
2035 gnu_type
= make_type_from_size (gnu_type
, gnu_comp_size
, false);
2036 gnu_type
= maybe_pad_type (gnu_type
, gnu_comp_size
, 0,
2037 gnat_entity
, "C_PAD", false,
2041 if (Has_Volatile_Components (Base_Type (gnat_entity
)))
2042 gnu_type
= build_qualified_type (gnu_type
,
2043 (TYPE_QUALS (gnu_type
)
2044 | TYPE_QUAL_VOLATILE
));
2046 gnu_max_size_unit
= size_binop (MULT_EXPR
, gnu_max_size
,
2047 TYPE_SIZE_UNIT (gnu_type
));
2048 gnu_max_size
= size_binop (MULT_EXPR
,
2049 convert (bitsizetype
, gnu_max_size
),
2050 TYPE_SIZE (gnu_type
));
2052 for (index
= array_dim
- 1; index
>= 0; index
--)
2054 gnu_type
= build_array_type (gnu_type
, gnu_index_type
[index
]);
2055 TYPE_MULTI_ARRAY_P (gnu_type
) = (index
> 0);
2056 /* If the type below this an multi-array type, then this
2057 does not not have aliased components.
2059 ??? Otherwise, for now, we say that any component of aggregate
2060 type is addressable because the front end may take 'Reference
2061 of it. But we have to make it addressable if it must be passed
2062 by reference or it that is the default. */
2063 TYPE_NONALIASED_COMPONENT (gnu_type
)
2064 = ((TREE_CODE (TREE_TYPE (gnu_type
)) == ARRAY_TYPE
2065 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type
))) ? 1
2066 : (!Has_Aliased_Components (gnat_entity
)
2067 && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_type
))));
2070 /* If we are at file level and this is a multi-dimensional array, we
2071 need to make a variable corresponding to the stride of the
2072 inner dimensions. */
2073 if (global_bindings_p () && array_dim
> 1)
2075 tree gnu_str_name
= get_identifier ("ST");
2078 for (gnu_arr_type
= TREE_TYPE (gnu_type
);
2079 TREE_CODE (gnu_arr_type
) == ARRAY_TYPE
;
2080 gnu_arr_type
= TREE_TYPE (gnu_arr_type
),
2081 gnu_str_name
= concat_id_with_name (gnu_str_name
, "ST"))
2083 tree eltype
= TREE_TYPE (gnu_arr_type
);
2085 TYPE_SIZE (gnu_arr_type
)
2086 = elaborate_expression_1 (gnat_entity
, gnat_entity
,
2087 TYPE_SIZE (gnu_arr_type
),
2088 gnu_str_name
, definition
, 0);
2090 /* ??? For now, store the size as a multiple of the
2091 alignment of the element type in bytes so that we
2092 can see the alignment from the tree. */
2093 TYPE_SIZE_UNIT (gnu_arr_type
)
2095 (MULT_EXPR
, sizetype
,
2096 elaborate_expression_1
2097 (gnat_entity
, gnat_entity
,
2098 build_binary_op (EXACT_DIV_EXPR
, sizetype
,
2099 TYPE_SIZE_UNIT (gnu_arr_type
),
2100 size_int (TYPE_ALIGN (eltype
)
2102 concat_id_with_name (gnu_str_name
, "A_U"),
2104 size_int (TYPE_ALIGN (eltype
) / BITS_PER_UNIT
));
2108 /* If we need to write out a record type giving the names of
2109 the bounds, do it now. */
2110 if (need_index_type_struct
&& debug_info_p
)
2112 tree gnu_bound_rec_type
= make_node (RECORD_TYPE
);
2113 tree gnu_field_list
= NULL_TREE
;
2116 TYPE_NAME (gnu_bound_rec_type
)
2117 = create_concat_name (gnat_entity
, "XA");
2119 for (index
= array_dim
- 1; index
>= 0; index
--)
2122 = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type
[index
]));
2124 if (TREE_CODE (gnu_type_name
) == TYPE_DECL
)
2125 gnu_type_name
= DECL_NAME (gnu_type_name
);
2127 gnu_field
= create_field_decl (gnu_type_name
,
2130 0, NULL_TREE
, NULL_TREE
, 0);
2131 TREE_CHAIN (gnu_field
) = gnu_field_list
;
2132 gnu_field_list
= gnu_field
;
2135 finish_record_type (gnu_bound_rec_type
, gnu_field_list
,
2139 TYPE_CONVENTION_FORTRAN_P (gnu_type
)
2140 = (Convention (gnat_entity
) == Convention_Fortran
);
2141 TYPE_PACKED_ARRAY_TYPE_P (gnu_type
)
2142 = Is_Packed_Array_Type (gnat_entity
);
2144 /* If our size depends on a placeholder and the maximum size doesn't
2145 overflow, use it. */
2146 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type
))
2147 && !(TREE_CODE (gnu_max_size
) == INTEGER_CST
2148 && TREE_OVERFLOW (gnu_max_size
))
2149 && !(TREE_CODE (gnu_max_size_unit
) == INTEGER_CST
2150 && TREE_OVERFLOW (gnu_max_size_unit
))
2153 TYPE_SIZE (gnu_type
) = size_binop (MIN_EXPR
, gnu_max_size
,
2154 TYPE_SIZE (gnu_type
));
2155 TYPE_SIZE_UNIT (gnu_type
)
2156 = size_binop (MIN_EXPR
, gnu_max_size_unit
,
2157 TYPE_SIZE_UNIT (gnu_type
));
2160 /* Set our alias set to that of our base type. This gives all
2161 array subtypes the same alias set. */
2162 copy_alias_set (gnu_type
, gnu_base_type
);
2165 /* If this is a packed type, make this type the same as the packed
2166 array type, but do some adjusting in the type first. */
2168 if (Present (Packed_Array_Type (gnat_entity
)))
2170 Entity_Id gnat_index
;
2171 tree gnu_inner_type
;
2173 /* First finish the type we had been making so that we output
2174 debugging information for it */
2176 = build_qualified_type (gnu_type
,
2177 (TYPE_QUALS (gnu_type
)
2178 | (TYPE_QUAL_VOLATILE
2179 * Treat_As_Volatile (gnat_entity
))));
2180 gnu_decl
= create_type_decl (gnu_entity_id
, gnu_type
, attr_list
,
2181 !Comes_From_Source (gnat_entity
),
2182 debug_info_p
, gnat_entity
);
2183 if (!Comes_From_Source (gnat_entity
))
2184 DECL_ARTIFICIAL (gnu_decl
) = 1;
2186 /* Save it as our equivalent in case the call below elaborates
2188 save_gnu_tree (gnat_entity
, gnu_decl
, false);
2190 gnu_decl
= gnat_to_gnu_entity (Packed_Array_Type (gnat_entity
),
2192 this_made_decl
= true;
2193 gnu_inner_type
= gnu_type
= TREE_TYPE (gnu_decl
);
2194 save_gnu_tree (gnat_entity
, NULL_TREE
, false);
2196 while (TREE_CODE (gnu_inner_type
) == RECORD_TYPE
2197 && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type
)
2198 || TYPE_IS_PADDING_P (gnu_inner_type
)))
2199 gnu_inner_type
= TREE_TYPE (TYPE_FIELDS (gnu_inner_type
));
2201 /* We need to point the type we just made to our index type so
2202 the actual bounds can be put into a template. */
2204 if ((TREE_CODE (gnu_inner_type
) == ARRAY_TYPE
2205 && !TYPE_ACTUAL_BOUNDS (gnu_inner_type
))
2206 || (TREE_CODE (gnu_inner_type
) == INTEGER_TYPE
2207 && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type
)))
2209 if (TREE_CODE (gnu_inner_type
) == INTEGER_TYPE
)
2211 /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus.
2212 If it is, we need to make another type. */
2213 if (TYPE_MODULAR_P (gnu_inner_type
))
2217 gnu_subtype
= make_node (INTEGER_TYPE
);
2219 TREE_TYPE (gnu_subtype
) = gnu_inner_type
;
2220 TYPE_MIN_VALUE (gnu_subtype
)
2221 = TYPE_MIN_VALUE (gnu_inner_type
);
2222 TYPE_MAX_VALUE (gnu_subtype
)
2223 = TYPE_MAX_VALUE (gnu_inner_type
);
2224 TYPE_PRECISION (gnu_subtype
)
2225 = TYPE_PRECISION (gnu_inner_type
);
2226 TYPE_UNSIGNED (gnu_subtype
)
2227 = TYPE_UNSIGNED (gnu_inner_type
);
2228 TYPE_EXTRA_SUBTYPE_P (gnu_subtype
) = 1;
2229 layout_type (gnu_subtype
);
2231 gnu_inner_type
= gnu_subtype
;
2234 TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type
) = 1;
2237 SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type
, NULL_TREE
);
2239 for (gnat_index
= First_Index (gnat_entity
);
2240 Present (gnat_index
); gnat_index
= Next_Index (gnat_index
))
2241 SET_TYPE_ACTUAL_BOUNDS
2243 tree_cons (NULL_TREE
,
2244 get_unpadded_type (Etype (gnat_index
)),
2245 TYPE_ACTUAL_BOUNDS (gnu_inner_type
)));
2247 if (Convention (gnat_entity
) != Convention_Fortran
)
2248 SET_TYPE_ACTUAL_BOUNDS
2250 nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type
)));
2252 if (TREE_CODE (gnu_type
) == RECORD_TYPE
2253 && TYPE_JUSTIFIED_MODULAR_P (gnu_type
))
2254 TREE_TYPE (TYPE_FIELDS (gnu_type
)) = gnu_inner_type
;
2258 /* Abort if packed array with no packed array type field set. */
2260 gcc_assert (!Is_Packed (gnat_entity
));
2264 case E_String_Literal_Subtype
:
2265 /* Create the type for a string literal. */
2267 Entity_Id gnat_full_type
2268 = (IN (Ekind (Etype (gnat_entity
)), Private_Kind
)
2269 && Present (Full_View (Etype (gnat_entity
)))
2270 ? Full_View (Etype (gnat_entity
)) : Etype (gnat_entity
));
2271 tree gnu_string_type
= get_unpadded_type (gnat_full_type
);
2272 tree gnu_string_array_type
2273 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type
))));
2274 tree gnu_string_index_type
2275 = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE
2276 (TYPE_DOMAIN (gnu_string_array_type
))));
2277 tree gnu_lower_bound
2278 = convert (gnu_string_index_type
,
2279 gnat_to_gnu (String_Literal_Low_Bound (gnat_entity
)));
2280 int length
= UI_To_Int (String_Literal_Length (gnat_entity
));
2281 tree gnu_length
= ssize_int (length
- 1);
2282 tree gnu_upper_bound
2283 = build_binary_op (PLUS_EXPR
, gnu_string_index_type
,
2285 convert (gnu_string_index_type
, gnu_length
));
2287 = build_range_type (gnu_string_index_type
,
2288 gnu_lower_bound
, gnu_upper_bound
);
2290 = create_index_type (convert (sizetype
,
2291 TYPE_MIN_VALUE (gnu_range_type
)),
2293 TYPE_MAX_VALUE (gnu_range_type
)),
2297 = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity
)),
2299 copy_alias_set (gnu_type
, gnu_string_type
);
2303 /* Record Types and Subtypes
2305 The following fields are defined on record types:
2307 Has_Discriminants True if the record has discriminants
2308 First_Discriminant Points to head of list of discriminants
2309 First_Entity Points to head of list of fields
2310 Is_Tagged_Type True if the record is tagged
2312 Implementation of Ada records and discriminated records:
2314 A record type definition is transformed into the equivalent of a C
2315 struct definition. The fields that are the discriminants which are
2316 found in the Full_Type_Declaration node and the elements of the
2317 Component_List found in the Record_Type_Definition node. The
2318 Component_List can be a recursive structure since each Variant of
2319 the Variant_Part of the Component_List has a Component_List.
2321 Processing of a record type definition comprises starting the list of
2322 field declarations here from the discriminants and the calling the
2323 function components_to_record to add the rest of the fields from the
2324 component list and return the gnu type node. The function
2325 components_to_record will call itself recursively as it traverses
2329 if (Has_Complex_Representation (gnat_entity
))
2332 = build_complex_type
2334 (Etype (Defining_Entity
2335 (First (Component_Items
2338 (Declaration_Node (gnat_entity
)))))))));
2344 Node_Id full_definition
= Declaration_Node (gnat_entity
);
2345 Node_Id record_definition
= Type_Definition (full_definition
);
2346 Entity_Id gnat_field
;
2348 tree gnu_field_list
= NULL_TREE
;
2349 tree gnu_get_parent
;
2350 int packed
= (Is_Packed (gnat_entity
) ? 1
2351 : (Component_Alignment (gnat_entity
)
2352 == Calign_Storage_Unit
) ? -1
2354 bool has_rep
= Has_Specified_Layout (gnat_entity
);
2355 bool all_rep
= has_rep
;
2357 = (Is_Tagged_Type (gnat_entity
)
2358 && Nkind (record_definition
) == N_Derived_Type_Definition
);
2360 /* See if all fields have a rep clause. Stop when we find one
2362 for (gnat_field
= First_Entity (gnat_entity
);
2363 Present (gnat_field
) && all_rep
;
2364 gnat_field
= Next_Entity (gnat_field
))
2365 if ((Ekind (gnat_field
) == E_Component
2366 || Ekind (gnat_field
) == E_Discriminant
)
2367 && No (Component_Clause (gnat_field
)))
2370 /* If this is a record extension, go a level further to find the
2371 record definition. Also, verify we have a Parent_Subtype. */
2374 if (!type_annotate_only
2375 || Present (Record_Extension_Part (record_definition
)))
2376 record_definition
= Record_Extension_Part (record_definition
);
2378 gcc_assert (type_annotate_only
2379 || Present (Parent_Subtype (gnat_entity
)));
2382 /* Make a node for the record. If we are not defining the record,
2383 suppress expanding incomplete types. We use the same RECORD_TYPE
2384 as for a dummy type and reset TYPE_DUMMY_P to show it's no longer
2387 It is very tempting to delay resetting this bit until we are done
2388 with completing the type, e.g. to let possible intermediate
2389 elaboration of access types designating the record know it is not
2390 complete and arrange for update_pointer_to to fix things up later.
2392 It would be wrong, however, because dummy types are expected only
2393 to be created for Ada incomplete or private types, which is not
2394 what we have here. Doing so would make other parts of gigi think
2395 we are dealing with a really incomplete or private type, and have
2396 nasty side effects, typically on the generation of the associated
2397 debugging information. */
2398 gnu_type
= make_dummy_type (gnat_entity
);
2399 TYPE_DUMMY_P (gnu_type
) = 0;
2401 if (TREE_CODE (TYPE_NAME (gnu_type
)) == TYPE_DECL
&& debug_info_p
)
2402 DECL_IGNORED_P (TYPE_NAME (gnu_type
)) = 0;
2404 TYPE_ALIGN (gnu_type
) = 0;
2405 TYPE_PACKED (gnu_type
) = packed
|| has_rep
;
2408 defer_incomplete_level
++, this_deferred
= true;
2410 /* If both a size and rep clause was specified, put the size in
2411 the record type now so that it can get the proper mode. */
2412 if (has_rep
&& Known_Esize (gnat_entity
))
2413 TYPE_SIZE (gnu_type
) = UI_To_gnu (Esize (gnat_entity
), sizetype
);
2415 /* Always set the alignment here so that it can be used to
2416 set the mode, if it is making the alignment stricter. If
2417 it is invalid, it will be checked again below. If this is to
2418 be Atomic, choose a default alignment of a word unless we know
2419 the size and it's smaller. */
2420 if (Known_Alignment (gnat_entity
))
2421 TYPE_ALIGN (gnu_type
)
2422 = validate_alignment (Alignment (gnat_entity
), gnat_entity
, 0);
2423 else if (Is_Atomic (gnat_entity
))
2424 TYPE_ALIGN (gnu_type
)
2425 = (esize
>= BITS_PER_WORD
? BITS_PER_WORD
2426 : 1 << (floor_log2 (esize
- 1) + 1));
2428 /* If we have a Parent_Subtype, make a field for the parent. If
2429 this record has rep clauses, force the position to zero. */
2430 if (Present (Parent_Subtype (gnat_entity
)))
2434 /* A major complexity here is that the parent subtype will
2435 reference our discriminants. But those must reference
2436 the parent component of this record. So here we will
2437 initialize each of those components to a COMPONENT_REF.
2438 The first operand of that COMPONENT_REF is another
2439 COMPONENT_REF which will be filled in below, once
2440 the parent type can be safely built. */
2442 gnu_get_parent
= build3 (COMPONENT_REF
, void_type_node
,
2443 build0 (PLACEHOLDER_EXPR
, gnu_type
),
2444 build_decl (FIELD_DECL
, NULL_TREE
,
2448 if (Has_Discriminants (gnat_entity
))
2449 for (gnat_field
= First_Stored_Discriminant (gnat_entity
);
2450 Present (gnat_field
);
2451 gnat_field
= Next_Stored_Discriminant (gnat_field
))
2452 if (Present (Corresponding_Discriminant (gnat_field
)))
2455 build3 (COMPONENT_REF
,
2456 get_unpadded_type (Etype (gnat_field
)),
2458 gnat_to_gnu_field_decl (Corresponding_Discriminant
2463 gnu_parent
= gnat_to_gnu_type (Parent_Subtype (gnat_entity
));
2466 = create_field_decl (get_identifier
2467 (Get_Name_String (Name_uParent
)),
2468 gnu_parent
, gnu_type
, 0,
2469 has_rep
? TYPE_SIZE (gnu_parent
) : 0,
2470 has_rep
? bitsize_zero_node
: 0, 1);
2471 DECL_INTERNAL_P (gnu_field_list
) = 1;
2473 TREE_TYPE (gnu_get_parent
) = gnu_parent
;
2474 TREE_OPERAND (gnu_get_parent
, 1) = gnu_field_list
;
2477 /* Make the fields for the discriminants and put them into the record
2478 unless it's an Unchecked_Union. */
2479 if (Has_Discriminants (gnat_entity
))
2480 for (gnat_field
= First_Stored_Discriminant (gnat_entity
);
2481 Present (gnat_field
);
2482 gnat_field
= Next_Stored_Discriminant (gnat_field
))
2484 /* If this is a record extension and this discriminant
2485 is the renaming of another discriminant, we've already
2486 handled the discriminant above. */
2487 if (Present (Parent_Subtype (gnat_entity
))
2488 && Present (Corresponding_Discriminant (gnat_field
)))
2492 = gnat_to_gnu_field (gnat_field
, gnu_type
, packed
, definition
);
2494 /* Make an expression using a PLACEHOLDER_EXPR from the
2495 FIELD_DECL node just created and link that with the
2496 corresponding GNAT defining identifier. Then add to the
2498 save_gnu_tree (gnat_field
,
2499 build3 (COMPONENT_REF
, TREE_TYPE (gnu_field
),
2500 build0 (PLACEHOLDER_EXPR
,
2501 DECL_CONTEXT (gnu_field
)),
2502 gnu_field
, NULL_TREE
),
2505 if (!Is_Unchecked_Union (gnat_entity
))
2507 TREE_CHAIN (gnu_field
) = gnu_field_list
;
2508 gnu_field_list
= gnu_field
;
2512 /* Put the discriminants into the record (backwards), so we can
2513 know the appropriate discriminant to use for the names of the
2515 TYPE_FIELDS (gnu_type
) = gnu_field_list
;
2517 /* Add the listed fields into the record and finish up. */
2518 components_to_record (gnu_type
, Component_List (record_definition
),
2519 gnu_field_list
, packed
, definition
, NULL
,
2520 false, all_rep
, this_deferred
,
2521 Is_Unchecked_Union (gnat_entity
));
2525 debug_deferred
= true;
2526 defer_debug_level
++;
2528 defer_debug_incomplete_list
2529 = tree_cons (NULL_TREE
, gnu_type
,
2530 defer_debug_incomplete_list
);
2533 /* We used to remove the associations of the discriminants and
2534 _Parent for validity checking, but we may need them if there's
2535 Freeze_Node for a subtype used in this record. */
2537 TYPE_VOLATILE (gnu_type
) = Treat_As_Volatile (gnat_entity
);
2538 TYPE_BY_REFERENCE_P (gnu_type
) = Is_By_Reference_Type (gnat_entity
);
2540 /* If it is a tagged record force the type to BLKmode to insure
2541 that these objects will always be placed in memory. Do the
2542 same thing for limited record types. */
2543 if (Is_Tagged_Type (gnat_entity
) || Is_Limited_Record (gnat_entity
))
2544 TYPE_MODE (gnu_type
) = BLKmode
;
2546 /* If this is a derived type, we must make the alias set of this type
2547 the same as that of the type we are derived from. We assume here
2548 that the other type is already frozen. */
2549 if (Etype (gnat_entity
) != gnat_entity
2550 && !(Is_Private_Type (Etype (gnat_entity
))
2551 && Full_View (Etype (gnat_entity
)) == gnat_entity
))
2552 copy_alias_set (gnu_type
, gnat_to_gnu_type (Etype (gnat_entity
)));
2554 /* Fill in locations of fields. */
2555 annotate_rep (gnat_entity
, gnu_type
);
2557 /* If there are any entities in the chain corresponding to
2558 components that we did not elaborate, ensure we elaborate their
2559 types if they are Itypes. */
2560 for (gnat_temp
= First_Entity (gnat_entity
);
2561 Present (gnat_temp
); gnat_temp
= Next_Entity (gnat_temp
))
2562 if ((Ekind (gnat_temp
) == E_Component
2563 || Ekind (gnat_temp
) == E_Discriminant
)
2564 && Is_Itype (Etype (gnat_temp
))
2565 && !present_gnu_tree (gnat_temp
))
2566 gnat_to_gnu_entity (Etype (gnat_temp
), NULL_TREE
, 0);
2570 case E_Class_Wide_Subtype
:
2571 /* If an equivalent type is present, that is what we should use.
2572 Otherwise, fall through to handle this like a record subtype
2573 since it may have constraints. */
2575 if (Present (Equivalent_Type (gnat_entity
)))
2577 gnu_decl
= gnat_to_gnu_entity (Equivalent_Type (gnat_entity
),
2579 maybe_present
= true;
2583 /* ... fall through ... */
2585 case E_Record_Subtype
:
2587 /* If Cloned_Subtype is Present it means this record subtype has
2588 identical layout to that type or subtype and we should use
2589 that GCC type for this one. The front end guarantees that
2590 the component list is shared. */
2591 if (Present (Cloned_Subtype (gnat_entity
)))
2593 gnu_decl
= gnat_to_gnu_entity (Cloned_Subtype (gnat_entity
),
2595 maybe_present
= true;
2598 /* Otherwise, first ensure the base type is elaborated. Then, if we are
2599 changing the type, make a new type with each field having the
2600 type of the field in the new subtype but having the position
2601 computed by transforming every discriminant reference according
2602 to the constraints. We don't see any difference between
2603 private and nonprivate type here since derivations from types should
2604 have been deferred until the completion of the private type. */
2607 Entity_Id gnat_base_type
= Implementation_Base_Type (gnat_entity
);
2612 defer_incomplete_level
++, this_deferred
= true;
2614 /* Get the base type initially for its alignment and sizes. But
2615 if it is a padded type, we do all the other work with the
2617 gnu_type
= gnu_orig_type
= gnu_base_type
2618 = gnat_to_gnu_type (gnat_base_type
);
2620 if (TREE_CODE (gnu_type
) == RECORD_TYPE
2621 && TYPE_IS_PADDING_P (gnu_type
))
2622 gnu_type
= gnu_orig_type
= TREE_TYPE (TYPE_FIELDS (gnu_type
));
2624 if (present_gnu_tree (gnat_entity
))
2626 maybe_present
= true;
2630 /* When the type has discriminants, and these discriminants
2631 affect the shape of what it built, factor them in.
2633 If we are making a subtype of an Unchecked_Union (must be an
2634 Itype), just return the type.
2636 We can't just use Is_Constrained because private subtypes without
2637 discriminants of full types with discriminants with default
2638 expressions are Is_Constrained but aren't constrained! */
2640 if (IN (Ekind (gnat_base_type
), Record_Kind
)
2641 && !Is_For_Access_Subtype (gnat_entity
)
2642 && !Is_Unchecked_Union (gnat_base_type
)
2643 && Is_Constrained (gnat_entity
)
2644 && Stored_Constraint (gnat_entity
) != No_Elist
2645 && Present (Discriminant_Constraint (gnat_entity
)))
2647 Entity_Id gnat_field
;
2648 tree gnu_field_list
= 0;
2650 = compute_field_positions (gnu_orig_type
, NULL_TREE
,
2651 size_zero_node
, bitsize_zero_node
,
2654 = substitution_list (gnat_entity
, gnat_base_type
, NULL_TREE
,
2658 gnu_type
= make_node (RECORD_TYPE
);
2659 TYPE_NAME (gnu_type
) = gnu_entity_id
;
2660 TYPE_STUB_DECL (gnu_type
)
2661 = create_type_decl (NULL_TREE
, gnu_type
, NULL
, false, false,
2663 TYPE_ALIGN (gnu_type
) = TYPE_ALIGN (gnu_base_type
);
2665 for (gnat_field
= First_Entity (gnat_entity
);
2666 Present (gnat_field
); gnat_field
= Next_Entity (gnat_field
))
2667 if ((Ekind (gnat_field
) == E_Component
2668 || Ekind (gnat_field
) == E_Discriminant
)
2669 && (Underlying_Type (Scope (Original_Record_Component
2672 && (No (Corresponding_Discriminant (gnat_field
))
2673 || !Is_Tagged_Type (gnat_base_type
)))
2676 = gnat_to_gnu_field_decl (Original_Record_Component
2679 = TREE_VALUE (purpose_member (gnu_old_field
,
2681 tree gnu_pos
= TREE_PURPOSE (gnu_offset
);
2682 tree gnu_bitpos
= TREE_VALUE (TREE_VALUE (gnu_offset
));
2684 = gnat_to_gnu_type (Etype (gnat_field
));
2685 tree gnu_size
= TYPE_SIZE (gnu_field_type
);
2686 tree gnu_new_pos
= 0;
2687 unsigned int offset_align
2688 = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset
)),
2692 /* If there was a component clause, the field types must be
2693 the same for the type and subtype, so copy the data from
2694 the old field to avoid recomputation here. Also if the
2695 field is justified modular and the optimization in
2696 gnat_to_gnu_field was applied. */
2697 if (Present (Component_Clause
2698 (Original_Record_Component (gnat_field
)))
2699 || (TREE_CODE (gnu_field_type
) == RECORD_TYPE
2700 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type
)
2701 && TREE_TYPE (TYPE_FIELDS (gnu_field_type
))
2702 == TREE_TYPE (gnu_old_field
)))
2704 gnu_size
= DECL_SIZE (gnu_old_field
);
2705 gnu_field_type
= TREE_TYPE (gnu_old_field
);
2708 /* If this was a bitfield, get the size from the old field.
2709 Also ensure the type can be placed into a bitfield. */
2710 else if (DECL_BIT_FIELD (gnu_old_field
))
2712 gnu_size
= DECL_SIZE (gnu_old_field
);
2713 if (TYPE_MODE (gnu_field_type
) == BLKmode
2714 && TREE_CODE (gnu_field_type
) == RECORD_TYPE
2715 && host_integerp (TYPE_SIZE (gnu_field_type
), 1))
2716 gnu_field_type
= make_packable_type (gnu_field_type
);
2719 if (CONTAINS_PLACEHOLDER_P (gnu_pos
))
2720 for (gnu_temp
= gnu_subst_list
;
2721 gnu_temp
; gnu_temp
= TREE_CHAIN (gnu_temp
))
2722 gnu_pos
= substitute_in_expr (gnu_pos
,
2723 TREE_PURPOSE (gnu_temp
),
2724 TREE_VALUE (gnu_temp
));
2726 /* If the size is now a constant, we can set it as the
2727 size of the field when we make it. Otherwise, we need
2728 to deal with it specially. */
2729 if (TREE_CONSTANT (gnu_pos
))
2730 gnu_new_pos
= bit_from_pos (gnu_pos
, gnu_bitpos
);
2734 (DECL_NAME (gnu_old_field
), gnu_field_type
, gnu_type
,
2735 0, gnu_size
, gnu_new_pos
,
2736 !DECL_NONADDRESSABLE_P (gnu_old_field
));
2738 if (!TREE_CONSTANT (gnu_pos
))
2740 normalize_offset (&gnu_pos
, &gnu_bitpos
, offset_align
);
2741 DECL_FIELD_OFFSET (gnu_field
) = gnu_pos
;
2742 DECL_FIELD_BIT_OFFSET (gnu_field
) = gnu_bitpos
;
2743 SET_DECL_OFFSET_ALIGN (gnu_field
, offset_align
);
2744 DECL_SIZE (gnu_field
) = gnu_size
;
2745 DECL_SIZE_UNIT (gnu_field
)
2746 = convert (sizetype
,
2747 size_binop (CEIL_DIV_EXPR
, gnu_size
,
2748 bitsize_unit_node
));
2749 layout_decl (gnu_field
, DECL_OFFSET_ALIGN (gnu_field
));
2752 DECL_INTERNAL_P (gnu_field
)
2753 = DECL_INTERNAL_P (gnu_old_field
);
2754 SET_DECL_ORIGINAL_FIELD
2755 (gnu_field
, (DECL_ORIGINAL_FIELD (gnu_old_field
)
2756 ? DECL_ORIGINAL_FIELD (gnu_old_field
)
2758 DECL_DISCRIMINANT_NUMBER (gnu_field
)
2759 = DECL_DISCRIMINANT_NUMBER (gnu_old_field
);
2760 TREE_THIS_VOLATILE (gnu_field
)
2761 = TREE_THIS_VOLATILE (gnu_old_field
);
2762 TREE_CHAIN (gnu_field
) = gnu_field_list
;
2763 gnu_field_list
= gnu_field
;
2764 save_gnu_tree (gnat_field
, gnu_field
, false);
2767 /* Now go through the entities again looking for Itypes that
2768 we have not elaborated but should (e.g., Etypes of fields
2769 that have Original_Components). */
2770 for (gnat_field
= First_Entity (gnat_entity
);
2771 Present (gnat_field
); gnat_field
= Next_Entity (gnat_field
))
2772 if ((Ekind (gnat_field
) == E_Discriminant
2773 || Ekind (gnat_field
) == E_Component
)
2774 && !present_gnu_tree (Etype (gnat_field
)))
2775 gnat_to_gnu_entity (Etype (gnat_field
), NULL_TREE
, 0);
2777 finish_record_type (gnu_type
, nreverse (gnu_field_list
),
2780 /* Now set the size, alignment and alias set of the new type to
2781 match that of the old one, doing any substitutions, as
2783 TYPE_ALIGN (gnu_type
) = TYPE_ALIGN (gnu_base_type
);
2784 TYPE_SIZE (gnu_type
) = TYPE_SIZE (gnu_base_type
);
2785 TYPE_SIZE_UNIT (gnu_type
) = TYPE_SIZE_UNIT (gnu_base_type
);
2786 SET_TYPE_ADA_SIZE (gnu_type
, TYPE_ADA_SIZE (gnu_base_type
));
2787 copy_alias_set (gnu_type
, gnu_base_type
);
2789 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type
)))
2790 for (gnu_temp
= gnu_subst_list
;
2791 gnu_temp
; gnu_temp
= TREE_CHAIN (gnu_temp
))
2792 TYPE_SIZE (gnu_type
)
2793 = substitute_in_expr (TYPE_SIZE (gnu_type
),
2794 TREE_PURPOSE (gnu_temp
),
2795 TREE_VALUE (gnu_temp
));
2797 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type
)))
2798 for (gnu_temp
= gnu_subst_list
;
2799 gnu_temp
; gnu_temp
= TREE_CHAIN (gnu_temp
))
2800 TYPE_SIZE_UNIT (gnu_type
)
2801 = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type
),
2802 TREE_PURPOSE (gnu_temp
),
2803 TREE_VALUE (gnu_temp
));
2805 if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type
)))
2806 for (gnu_temp
= gnu_subst_list
;
2807 gnu_temp
; gnu_temp
= TREE_CHAIN (gnu_temp
))
2809 (gnu_type
, substitute_in_expr (TYPE_ADA_SIZE (gnu_type
),
2810 TREE_PURPOSE (gnu_temp
),
2811 TREE_VALUE (gnu_temp
)));
2813 /* Recompute the mode of this record type now that we know its
2815 compute_record_mode (gnu_type
);
2817 /* Fill in locations of fields. */
2818 annotate_rep (gnat_entity
, gnu_type
);
2821 /* If we've made a new type, record it and make an XVS type to show
2822 what this is a subtype of. Some debuggers require the XVS
2823 type to be output first, so do it in that order. */
2824 if (gnu_type
!= gnu_orig_type
)
2828 tree gnu_subtype_marker
= make_node (RECORD_TYPE
);
2829 tree gnu_orig_name
= TYPE_NAME (gnu_orig_type
);
2831 if (TREE_CODE (gnu_orig_name
) == TYPE_DECL
)
2832 gnu_orig_name
= DECL_NAME (gnu_orig_name
);
2834 TYPE_NAME (gnu_subtype_marker
)
2835 = create_concat_name (gnat_entity
, "XVS");
2836 finish_record_type (gnu_subtype_marker
,
2837 create_field_decl (gnu_orig_name
,
2845 TYPE_VOLATILE (gnu_type
) = Treat_As_Volatile (gnat_entity
);
2846 TYPE_NAME (gnu_type
) = gnu_entity_id
;
2847 TYPE_STUB_DECL (gnu_type
)
2848 = create_type_decl (TYPE_NAME (gnu_type
), gnu_type
,
2849 NULL
, true, debug_info_p
, gnat_entity
);
2852 /* Otherwise, go down all the components in the new type and
2853 make them equivalent to those in the base type. */
2855 for (gnat_temp
= First_Entity (gnat_entity
); Present (gnat_temp
);
2856 gnat_temp
= Next_Entity (gnat_temp
))
2857 if ((Ekind (gnat_temp
) == E_Discriminant
2858 && !Is_Unchecked_Union (gnat_base_type
))
2859 || Ekind (gnat_temp
) == E_Component
)
2860 save_gnu_tree (gnat_temp
,
2861 gnat_to_gnu_field_decl
2862 (Original_Record_Component (gnat_temp
)), false);
2866 case E_Access_Subprogram_Type
:
2867 case E_Anonymous_Access_Subprogram_Type
:
2868 /* If we are not defining this entity, and we have incomplete
2869 entities being processed above us, make a dummy type and
2870 fill it in later. */
2871 if (!definition
&& defer_incomplete_level
!= 0)
2873 struct incomplete
*p
2874 = (struct incomplete
*) xmalloc (sizeof (struct incomplete
));
2877 = build_pointer_type
2878 (make_dummy_type (Directly_Designated_Type (gnat_entity
)));
2879 gnu_decl
= create_type_decl (gnu_entity_id
, gnu_type
, attr_list
,
2880 !Comes_From_Source (gnat_entity
),
2881 debug_info_p
, gnat_entity
);
2882 save_gnu_tree (gnat_entity
, gnu_decl
, false);
2883 this_made_decl
= saved
= true;
2885 p
->old_type
= TREE_TYPE (gnu_type
);
2886 p
->full_type
= Directly_Designated_Type (gnat_entity
);
2887 p
->next
= defer_incomplete_list
;
2888 defer_incomplete_list
= p
;
2892 /* ... fall through ... */
2894 case E_Allocator_Type
:
2896 case E_Access_Attribute_Type
:
2897 case E_Anonymous_Access_Type
:
2898 case E_General_Access_Type
:
2900 Entity_Id gnat_desig_type
= Directly_Designated_Type (gnat_entity
);
2901 Entity_Id gnat_desig_full
2902 = ((IN (Ekind (Etype (gnat_desig_type
)),
2903 Incomplete_Or_Private_Kind
))
2904 ? Full_View (gnat_desig_type
) : 0);
2905 /* We want to know if we'll be seeing the freeze node for any
2906 incomplete type we may be pointing to. */
2908 = (Present (gnat_desig_full
)
2909 ? In_Extended_Main_Code_Unit (gnat_desig_full
)
2910 : In_Extended_Main_Code_Unit (gnat_desig_type
));
2911 bool got_fat_p
= false;
2912 bool made_dummy
= false;
2913 tree gnu_desig_type
= NULL_TREE
;
2914 enum machine_mode p_mode
= mode_for_size (esize
, MODE_INT
, 0);
2916 if (!targetm
.valid_pointer_mode (p_mode
))
2919 if (No (gnat_desig_full
)
2920 && (Ekind (gnat_desig_type
) == E_Class_Wide_Type
2921 || (Ekind (gnat_desig_type
) == E_Class_Wide_Subtype
2922 && Present (Equivalent_Type (gnat_desig_type
)))))
2924 if (Present (Equivalent_Type (gnat_desig_type
)))
2926 gnat_desig_full
= Equivalent_Type (gnat_desig_type
);
2927 if (IN (Ekind (gnat_desig_full
), Incomplete_Or_Private_Kind
))
2928 gnat_desig_full
= Full_View (gnat_desig_full
);
2930 else if (IN (Ekind (Root_Type (gnat_desig_type
)),
2931 Incomplete_Or_Private_Kind
))
2932 gnat_desig_full
= Full_View (Root_Type (gnat_desig_type
));
2935 if (Present (gnat_desig_full
) && Is_Concurrent_Type (gnat_desig_full
))
2936 gnat_desig_full
= Corresponding_Record_Type (gnat_desig_full
);
2938 /* If either the designated type or its full view is an
2939 unconstrained array subtype, replace it with the type it's a
2940 subtype of. This avoids problems with multiple copies of
2941 unconstrained array types. */
2942 if (Ekind (gnat_desig_type
) == E_Array_Subtype
2943 && !Is_Constrained (gnat_desig_type
))
2944 gnat_desig_type
= Etype (gnat_desig_type
);
2945 if (Present (gnat_desig_full
)
2946 && Ekind (gnat_desig_full
) == E_Array_Subtype
2947 && !Is_Constrained (gnat_desig_full
))
2948 gnat_desig_full
= Etype (gnat_desig_full
);
2950 /* If the designated type is a subtype of an incomplete record type,
2951 use the parent type to avoid order of elaboration issues. This
2952 can lose some code efficiency, but there is no alternative. */
2953 if (Present (gnat_desig_full
)
2954 && Ekind (gnat_desig_full
) == E_Record_Subtype
2955 && Ekind (Etype (gnat_desig_full
)) == E_Record_Type
)
2956 gnat_desig_full
= Etype (gnat_desig_full
);
2958 /* If we are pointing to an incomplete type whose completion is an
2959 unconstrained array, make a fat pointer type instead of a pointer
2960 to VOID. The two types in our fields will be pointers to VOID and
2961 will be replaced in update_pointer_to. Similarly, if the type
2962 itself is a dummy type or an unconstrained array. Also make
2963 a dummy TYPE_OBJECT_RECORD_TYPE in case we have any thin
2966 if ((Present (gnat_desig_full
)
2967 && Is_Array_Type (gnat_desig_full
)
2968 && !Is_Constrained (gnat_desig_full
))
2969 || (present_gnu_tree (gnat_desig_type
)
2970 && TYPE_IS_DUMMY_P (TREE_TYPE
2971 (get_gnu_tree (gnat_desig_type
)))
2972 && Is_Array_Type (gnat_desig_type
)
2973 && !Is_Constrained (gnat_desig_type
))
2974 || (present_gnu_tree (gnat_desig_type
)
2975 && (TREE_CODE (TREE_TYPE (get_gnu_tree (gnat_desig_type
)))
2976 == UNCONSTRAINED_ARRAY_TYPE
)
2977 && !(TYPE_POINTER_TO (TREE_TYPE
2978 (get_gnu_tree (gnat_desig_type
)))))
2979 || (No (gnat_desig_full
) && !in_main_unit
2980 && defer_incomplete_level
2981 && !present_gnu_tree (gnat_desig_type
)
2982 && Is_Array_Type (gnat_desig_type
)
2983 && !Is_Constrained (gnat_desig_type
)))
2986 = (present_gnu_tree (gnat_desig_type
)
2987 ? gnat_to_gnu_type (gnat_desig_type
)
2988 : make_dummy_type (gnat_desig_type
));
2991 /* Show the dummy we get will be a fat pointer. */
2992 got_fat_p
= made_dummy
= true;
2994 /* If the call above got something that has a pointer, that
2995 pointer is our type. This could have happened either
2996 because the type was elaborated or because somebody
2997 else executed the code below. */
2998 gnu_type
= TYPE_POINTER_TO (gnu_old
);
3001 gnu_type
= make_node (RECORD_TYPE
);
3002 SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type
, gnu_old
);
3003 TYPE_POINTER_TO (gnu_old
) = gnu_type
;
3005 Sloc_to_locus (Sloc (gnat_entity
), &input_location
);
3007 = chainon (chainon (NULL_TREE
,
3009 (get_identifier ("P_ARRAY"),
3010 ptr_void_type_node
, gnu_type
,
3012 create_field_decl (get_identifier ("P_BOUNDS"),
3014 gnu_type
, 0, 0, 0, 0));
3016 /* Make sure we can place this into a register. */
3017 TYPE_ALIGN (gnu_type
)
3018 = MIN (BIGGEST_ALIGNMENT
, 2 * POINTER_SIZE
);
3019 TYPE_IS_FAT_POINTER_P (gnu_type
) = 1;
3020 finish_record_type (gnu_type
, fields
, false, true);
3022 TYPE_OBJECT_RECORD_TYPE (gnu_old
) = make_node (RECORD_TYPE
);
3023 TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old
))
3024 = concat_id_with_name (get_entity_name (gnat_desig_type
),
3026 TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old
)) = 1;
3030 /* If we already know what the full type is, use it. */
3031 else if (Present (gnat_desig_full
)
3032 && present_gnu_tree (gnat_desig_full
))
3033 gnu_desig_type
= TREE_TYPE (get_gnu_tree (gnat_desig_full
));
3035 /* Get the type of the thing we are to point to and build a pointer
3036 to it. If it is a reference to an incomplete or private type with a
3037 full view that is a record, make a dummy type node and get the
3038 actual type later when we have verified it is safe. */
3039 else if (!in_main_unit
3040 && !present_gnu_tree (gnat_desig_type
)
3041 && Present (gnat_desig_full
)
3042 && !present_gnu_tree (gnat_desig_full
)
3043 && Is_Record_Type (gnat_desig_full
))
3045 gnu_desig_type
= make_dummy_type (gnat_desig_type
);
3049 /* Likewise if we are pointing to a record or array and we are to defer
3050 elaborating incomplete types. We do this since this access type
3051 may be the full view of some private type. Note that the
3052 unconstrained array case is handled above. */
3053 else if ((!in_main_unit
|| imported_p
) && defer_incomplete_level
!= 0
3054 && !present_gnu_tree (gnat_desig_type
)
3055 && ((Is_Record_Type (gnat_desig_type
)
3056 || Is_Array_Type (gnat_desig_type
))
3057 || (Present (gnat_desig_full
)
3058 && (Is_Record_Type (gnat_desig_full
)
3059 || Is_Array_Type (gnat_desig_full
)))))
3061 gnu_desig_type
= make_dummy_type (gnat_desig_type
);
3064 else if (gnat_desig_type
== gnat_entity
)
3067 = build_pointer_type_for_mode (make_node (VOID_TYPE
),
3069 No_Strict_Aliasing (gnat_entity
));
3070 TREE_TYPE (gnu_type
) = TYPE_POINTER_TO (gnu_type
) = gnu_type
;
3073 gnu_desig_type
= gnat_to_gnu_type (gnat_desig_type
);
3075 /* It is possible that the above call to gnat_to_gnu_type resolved our
3076 type. If so, just return it. */
3077 if (present_gnu_tree (gnat_entity
))
3079 maybe_present
= true;
3083 /* If we have a GCC type for the designated type, possibly modify it
3084 if we are pointing only to constant objects and then make a pointer
3085 to it. Don't do this for unconstrained arrays. */
3086 if (!gnu_type
&& gnu_desig_type
)
3088 if (Is_Access_Constant (gnat_entity
)
3089 && TREE_CODE (gnu_desig_type
) != UNCONSTRAINED_ARRAY_TYPE
)
3092 = build_qualified_type
3094 TYPE_QUALS (gnu_desig_type
) | TYPE_QUAL_CONST
);
3096 /* Some extra processing is required if we are building a
3097 pointer to an incomplete type (in the GCC sense). We might
3098 have such a type if we just made a dummy, or directly out
3099 of the call to gnat_to_gnu_type above if we are processing
3100 an access type for a record component designating the
3101 record type itself. */
3102 if (TYPE_MODE (gnu_desig_type
) == VOIDmode
)
3104 /* We must ensure that the pointer to variant we make will
3105 be processed by update_pointer_to when the initial type
3106 is completed. Pretend we made a dummy and let further
3107 processing act as usual. */
3110 /* We must ensure that update_pointer_to will not retrieve
3111 the dummy variant when building a properly qualified
3112 version of the complete type. We take advantage of the
3113 fact that get_qualified_type is requiring TYPE_NAMEs to
3114 match to influence build_qualified_type and then also
3115 update_pointer_to here. */
3116 TYPE_NAME (gnu_desig_type
)
3117 = create_concat_name (gnat_desig_type
, "INCOMPLETE_CST");
3122 = build_pointer_type_for_mode (gnu_desig_type
, p_mode
,
3123 No_Strict_Aliasing (gnat_entity
));
3126 /* If we are not defining this object and we made a dummy pointer,
3127 save our current definition, evaluate the actual type, and replace
3128 the tentative type we made with the actual one. If we are to defer
3129 actually looking up the actual type, make an entry in the
3132 if (!in_main_unit
&& made_dummy
)
3135 = TYPE_FAT_POINTER_P (gnu_type
)
3136 ? TYPE_UNCONSTRAINED_ARRAY (gnu_type
) : TREE_TYPE (gnu_type
);
3138 if (esize
== POINTER_SIZE
3139 && (got_fat_p
|| TYPE_FAT_POINTER_P (gnu_type
)))
3141 = build_pointer_type
3142 (TYPE_OBJECT_RECORD_TYPE
3143 (TYPE_UNCONSTRAINED_ARRAY (gnu_type
)));
3145 gnu_decl
= create_type_decl (gnu_entity_id
, gnu_type
, attr_list
,
3146 !Comes_From_Source (gnat_entity
),
3147 debug_info_p
, gnat_entity
);
3148 save_gnu_tree (gnat_entity
, gnu_decl
, false);
3149 this_made_decl
= saved
= true;
3151 if (defer_incomplete_level
== 0)
3152 /* Note that the call to gnat_to_gnu_type here might have
3153 updated gnu_old_type directly, in which case it is not a
3154 dummy type any more when we get into update_pointer_to.
3156 This may happen for instance when the designated type is a
3157 record type, because their elaboration starts with an
3158 initial node from make_dummy_type, which may yield the same
3159 node as the one we got.
3161 Besides, variants of this non-dummy type might have been
3162 created along the way. update_pointer_to is expected to
3163 properly take care of those situations. */
3164 update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type
),
3165 gnat_to_gnu_type (gnat_desig_type
));
3168 struct incomplete
*p
3169 = (struct incomplete
*) xmalloc (sizeof (struct incomplete
));
3171 p
->old_type
= gnu_old_type
;
3172 p
->full_type
= gnat_desig_type
;
3173 p
->next
= defer_incomplete_list
;
3174 defer_incomplete_list
= p
;
3180 case E_Access_Protected_Subprogram_Type
:
3181 case E_Anonymous_Access_Protected_Subprogram_Type
:
3182 if (type_annotate_only
&& No (Equivalent_Type (gnat_entity
)))
3183 gnu_type
= build_pointer_type (void_type_node
);
3185 /* The runtime representation is the equivalent type. */
3186 gnu_type
= gnat_to_gnu_type (Equivalent_Type (gnat_entity
));
3188 if (Is_Itype (Directly_Designated_Type (gnat_entity
))
3189 && !present_gnu_tree (Directly_Designated_Type (gnat_entity
))
3190 && No (Freeze_Node (Directly_Designated_Type (gnat_entity
)))
3191 && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity
))))
3192 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity
),
3197 case E_Access_Subtype
:
3199 /* We treat this as identical to its base type; any constraint is
3200 meaningful only to the front end.
3202 The designated type must be elaborated as well, if it does
3203 not have its own freeze node. Designated (sub)types created
3204 for constrained components of records with discriminants are
3205 not frozen by the front end and thus not elaborated by gigi,
3206 because their use may appear before the base type is frozen,
3207 and because it is not clear that they are needed anywhere in
3208 Gigi. With the current model, there is no correct place where
3209 they could be elaborated. */
3211 gnu_type
= gnat_to_gnu_type (Etype (gnat_entity
));
3212 if (Is_Itype (Directly_Designated_Type (gnat_entity
))
3213 && !present_gnu_tree (Directly_Designated_Type (gnat_entity
))
3214 && Is_Frozen (Directly_Designated_Type (gnat_entity
))
3215 && No (Freeze_Node (Directly_Designated_Type (gnat_entity
))))
3217 /* If we are not defining this entity, and we have incomplete
3218 entities being processed above us, make a dummy type and
3219 elaborate it later. */
3220 if (!definition
&& defer_incomplete_level
!= 0)
3222 struct incomplete
*p
3223 = (struct incomplete
*) xmalloc (sizeof (struct incomplete
));
3225 = build_pointer_type
3226 (make_dummy_type (Directly_Designated_Type (gnat_entity
)));
3228 p
->old_type
= TREE_TYPE (gnu_ptr_type
);
3229 p
->full_type
= Directly_Designated_Type (gnat_entity
);
3230 p
->next
= defer_incomplete_list
;
3231 defer_incomplete_list
= p
;
3233 else if (IN (Ekind (Base_Type
3234 (Directly_Designated_Type (gnat_entity
))),
3235 Incomplete_Or_Private_Kind
))
3238 gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity
),
3242 maybe_present
= true;
3245 /* Subprogram Entities
3247 The following access functions are defined for subprograms (functions
3250 First_Formal The first formal parameter.
3251 Is_Imported Indicates that the subprogram has appeared in
3252 an INTERFACE or IMPORT pragma. For now we
3253 assume that the external language is C.
3254 Is_Inlined True if the subprogram is to be inlined.
3256 In addition for function subprograms we have:
3258 Etype Return type of the function.
3260 Each parameter is first checked by calling must_pass_by_ref on its
3261 type to determine if it is passed by reference. For parameters which
3262 are copied in, if they are Ada IN OUT or OUT parameters, their return
3263 value becomes part of a record which becomes the return type of the
3264 function (C function - note that this applies only to Ada procedures
3265 so there is no Ada return type). Additional code to store back the
3266 parameters will be generated on the caller side. This transformation
3267 is done here, not in the front-end.
3269 The intended result of the transformation can be seen from the
3270 equivalent source rewritings that follow:
3272 struct temp {int a,b};
3273 procedure P (A,B: IN OUT ...) is temp P (int A,B) {
3275 end P; return {A,B};
3285 For subprogram types we need to perform mainly the same conversions to
3286 GCC form that are needed for procedures and function declarations. The
3287 only difference is that at the end, we make a type declaration instead
3288 of a function declaration. */
3290 case E_Subprogram_Type
:
3294 /* The first GCC parameter declaration (a PARM_DECL node). The
3295 PARM_DECL nodes are chained through the TREE_CHAIN field, so this
3296 actually is the head of this parameter list. */
3297 tree gnu_param_list
= NULL_TREE
;
3298 /* The type returned by a function. If the subprogram is a procedure
3299 this type should be void_type_node. */
3300 tree gnu_return_type
= void_type_node
;
3301 /* List of fields in return type of procedure with copy in copy out
3303 tree gnu_field_list
= NULL_TREE
;
3304 /* Non-null for subprograms containing parameters passed by copy in
3305 copy out (Ada IN OUT or OUT parameters not passed by reference),
3306 in which case it is the list of nodes used to specify the values of
3307 the in out/out parameters that are returned as a record upon
3308 procedure return. The TREE_PURPOSE of an element of this list is
3309 a field of the record and the TREE_VALUE is the PARM_DECL
3310 corresponding to that field. This list will be saved in the
3311 TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
3312 tree gnu_return_list
= NULL_TREE
;
3313 /* If an import pragma asks to map this subprogram to a GCC builtin,
3314 this is the builtin DECL node. */
3315 tree gnu_builtin_decl
= NULL_TREE
;
3316 Entity_Id gnat_param
;
3317 bool inline_flag
= Is_Inlined (gnat_entity
);
3318 bool public_flag
= Is_Public (gnat_entity
);
3320 = (Is_Public (gnat_entity
) && !definition
) || imported_p
;
3321 bool pure_flag
= Is_Pure (gnat_entity
);
3322 bool volatile_flag
= No_Return (gnat_entity
);
3323 bool returns_by_ref
= false;
3324 bool returns_unconstrained
= false;
3325 bool returns_by_target_ptr
= false;
3326 tree gnu_ext_name
= create_concat_name (gnat_entity
, 0);
3327 bool has_copy_in_out
= false;
3330 if (kind
== E_Subprogram_Type
&& !definition
)
3331 /* A parameter may refer to this type, so defer completion
3332 of any incomplete types. */
3333 defer_incomplete_level
++, this_deferred
= true;
3335 /* If the subprogram has an alias, it is probably inherited, so
3336 we can use the original one. If the original "subprogram"
3337 is actually an enumeration literal, it may be the first use
3338 of its type, so we must elaborate that type now. */
3339 if (Present (Alias (gnat_entity
)))
3341 if (Ekind (Alias (gnat_entity
)) == E_Enumeration_Literal
)
3342 gnat_to_gnu_entity (Etype (Alias (gnat_entity
)), NULL_TREE
, 0);
3344 gnu_decl
= gnat_to_gnu_entity (Alias (gnat_entity
),
3347 /* Elaborate any Itypes in the parameters of this entity. */
3348 for (gnat_temp
= First_Formal (gnat_entity
);
3349 Present (gnat_temp
);
3350 gnat_temp
= Next_Formal_With_Extras (gnat_temp
))
3351 if (Is_Itype (Etype (gnat_temp
)))
3352 gnat_to_gnu_entity (Etype (gnat_temp
), NULL_TREE
, 0);
3357 /* If this subprogram is expectedly bound to a GCC builtin, fetch the
3358 corresponding DECL node.
3360 We still want the parameter associations to take place because the
3361 proper generation of calls depends on it (a GNAT parameter without
3362 a corresponding GCC tree has a very specific meaning), so we don't
3364 if (Convention (gnat_entity
) == Convention_Intrinsic
)
3365 gnu_builtin_decl
= builtin_decl_for (gnu_ext_name
);
3367 /* ??? What if we don't find the builtin node above ? warn ? err ?
3368 In the current state we neither warn nor err, and calls will just
3369 be handled as for regular subprograms. */
3371 if (kind
== E_Function
|| kind
== E_Subprogram_Type
)
3372 gnu_return_type
= gnat_to_gnu_type (Etype (gnat_entity
));
3374 /* If this function returns by reference, make the actual
3375 return type of this function the pointer and mark the decl. */
3376 if (Returns_By_Ref (gnat_entity
))
3378 returns_by_ref
= true;
3379 gnu_return_type
= build_pointer_type (gnu_return_type
);
3382 /* If the Mechanism is By_Reference, ensure the return type uses
3383 the machine's by-reference mechanism, which may not the same
3384 as above (e.g., it might be by passing a fake parameter). */
3385 else if (kind
== E_Function
3386 && Mechanism (gnat_entity
) == By_Reference
)
3388 gnu_return_type
= copy_type (gnu_return_type
);
3389 TREE_ADDRESSABLE (gnu_return_type
) = 1;
3392 /* If we are supposed to return an unconstrained array,
3393 actually return a fat pointer and make a note of that. Return
3394 a pointer to an unconstrained record of variable size. */
3395 else if (TREE_CODE (gnu_return_type
) == UNCONSTRAINED_ARRAY_TYPE
)
3397 gnu_return_type
= TREE_TYPE (gnu_return_type
);
3398 returns_unconstrained
= true;
3401 /* If the type requires a transient scope, the result is allocated
3402 on the secondary stack, so the result type of the function is
3404 else if (Requires_Transient_Scope (Etype (gnat_entity
)))
3406 gnu_return_type
= build_pointer_type (gnu_return_type
);
3407 returns_unconstrained
= true;
3410 /* If the type is a padded type and the underlying type would not
3411 be passed by reference or this function has a foreign convention,
3412 return the underlying type. */
3413 else if (TREE_CODE (gnu_return_type
) == RECORD_TYPE
3414 && TYPE_IS_PADDING_P (gnu_return_type
)
3415 && (!default_pass_by_ref (TREE_TYPE
3416 (TYPE_FIELDS (gnu_return_type
)))
3417 || Has_Foreign_Convention (gnat_entity
)))
3418 gnu_return_type
= TREE_TYPE (TYPE_FIELDS (gnu_return_type
));
3420 /* If the return type is unconstrained, that means it must have a
3421 maximum size. We convert the function into a procedure and its
3422 caller will pass a pointer to an object of that maximum size as the
3423 first parameter when we call the function. */
3424 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type
)))
3426 returns_by_target_ptr
= true;
3428 = create_param_decl (get_identifier ("TARGET"),
3429 build_reference_type (gnu_return_type
),
3431 gnu_return_type
= void_type_node
;
3434 /* If the return type has a size that overflows, we cannot have
3435 a function that returns that type. This usage doesn't make
3436 sense anyway, so give an error here. */
3437 if (TYPE_SIZE_UNIT (gnu_return_type
)
3438 && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type
))
3439 && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type
)))
3441 post_error ("cannot return type whose size overflows",
3443 gnu_return_type
= copy_node (gnu_return_type
);
3444 TYPE_SIZE (gnu_return_type
) = bitsize_zero_node
;
3445 TYPE_SIZE_UNIT (gnu_return_type
) = size_zero_node
;
3446 TYPE_MAIN_VARIANT (gnu_return_type
) = gnu_return_type
;
3447 TYPE_NEXT_VARIANT (gnu_return_type
) = NULL_TREE
;
3450 /* Look at all our parameters and get the type of
3451 each. While doing this, build a copy-out structure if
3454 for (gnat_param
= First_Formal (gnat_entity
), parmnum
= 0;
3455 Present (gnat_param
);
3456 gnat_param
= Next_Formal_With_Extras (gnat_param
), parmnum
++)
3458 tree gnu_param_name
= get_entity_name (gnat_param
);
3459 tree gnu_param_type
= gnat_to_gnu_type (Etype (gnat_param
));
3460 tree gnu_param
, gnu_field
;
3461 bool by_ref_p
= false;
3462 bool by_descr_p
= false;
3463 bool by_component_ptr_p
= false;
3464 bool copy_in_copy_out_flag
= false;
3465 bool req_by_copy
= false, req_by_ref
= false;
3467 /* Builtins are expanded inline and there is no real call sequence
3468 involved. so the type expected by the underlying expander is
3469 always the type of each argument "as is". */
3470 if (gnu_builtin_decl
)
3473 /* Otherwise, see if a Mechanism was supplied that forced this
3474 parameter to be passed one way or another. */
3475 else if (Is_Valued_Procedure (gnat_entity
) && parmnum
== 0)
3477 else if (Mechanism (gnat_param
) == Default
)
3479 else if (Mechanism (gnat_param
) == By_Copy
)
3481 else if (Mechanism (gnat_param
) == By_Reference
)
3483 else if (Mechanism (gnat_param
) <= By_Descriptor
)
3485 else if (Mechanism (gnat_param
) > 0)
3487 if (TREE_CODE (gnu_param_type
) == UNCONSTRAINED_ARRAY_TYPE
3488 || TREE_CODE (TYPE_SIZE (gnu_param_type
)) != INTEGER_CST
3489 || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type
),
3490 Mechanism (gnat_param
)))
3496 post_error ("unsupported mechanism for&", gnat_param
);
3498 /* If this is either a foreign function or if the
3499 underlying type won't be passed by reference, strip off
3500 possible padding type. */
3501 if (TREE_CODE (gnu_param_type
) == RECORD_TYPE
3502 && TYPE_IS_PADDING_P (gnu_param_type
)
3503 && (req_by_ref
|| Has_Foreign_Convention (gnat_entity
)
3504 || (!must_pass_by_ref (TREE_TYPE (TYPE_FIELDS
3507 || !default_pass_by_ref (TREE_TYPE
3509 (gnu_param_type
)))))))
3510 gnu_param_type
= TREE_TYPE (TYPE_FIELDS (gnu_param_type
));
3512 /* If this is an IN parameter it is read-only, so make a variant
3513 of the type that is read-only.
3515 ??? However, if this is an unconstrained array, that type can
3516 be very complex. So skip it for now. Likewise for any other
3517 self-referential type. */
3518 if (Ekind (gnat_param
) == E_In_Parameter
3519 && TREE_CODE (gnu_param_type
) != UNCONSTRAINED_ARRAY_TYPE
3520 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type
)))
3522 = build_qualified_type (gnu_param_type
,
3523 (TYPE_QUALS (gnu_param_type
)
3524 | TYPE_QUAL_CONST
));
3526 /* For foreign conventions, pass arrays as a pointer to the
3527 underlying type. First check for unconstrained array and get
3528 the underlying array. Then get the component type and build
3530 if (Has_Foreign_Convention (gnat_entity
)
3531 && TREE_CODE (gnu_param_type
) == UNCONSTRAINED_ARRAY_TYPE
)
3533 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS
3534 (TREE_TYPE (gnu_param_type
))));
3538 = build_pointer_type
3539 (build_vms_descriptor (gnu_param_type
,
3540 Mechanism (gnat_param
), gnat_entity
));
3542 else if (Has_Foreign_Convention (gnat_entity
)
3544 && TREE_CODE (gnu_param_type
) == ARRAY_TYPE
)
3546 /* Strip off any multi-dimensional entries, then strip
3547 off the last array to get the component type. */
3548 while (TREE_CODE (TREE_TYPE (gnu_param_type
)) == ARRAY_TYPE
3549 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type
)))
3550 gnu_param_type
= TREE_TYPE (gnu_param_type
);
3552 by_component_ptr_p
= true;
3553 gnu_param_type
= TREE_TYPE (gnu_param_type
);
3555 if (Ekind (gnat_param
) == E_In_Parameter
)
3557 = build_qualified_type (gnu_param_type
,
3558 (TYPE_QUALS (gnu_param_type
)
3559 | TYPE_QUAL_CONST
));
3561 gnu_param_type
= build_pointer_type (gnu_param_type
);
3564 /* Fat pointers are passed as thin pointers for foreign
3566 else if (Has_Foreign_Convention (gnat_entity
)
3567 && TYPE_FAT_POINTER_P (gnu_param_type
))
3569 = make_type_from_size (gnu_param_type
,
3570 size_int (POINTER_SIZE
), false);
3572 /* If we must pass or were requested to pass by reference, do so.
3573 If we were requested to pass by copy, do so.
3574 Otherwise, for foreign conventions, pass all in out parameters
3575 or aggregates by reference. For COBOL and Fortran, pass
3576 all integer and FP types that way too. For Convention Ada,
3577 use the standard Ada default. */
3578 else if (must_pass_by_ref (gnu_param_type
) || req_by_ref
3580 && ((Has_Foreign_Convention (gnat_entity
)
3581 && (Ekind (gnat_param
) != E_In_Parameter
3582 || AGGREGATE_TYPE_P (gnu_param_type
)))
3583 || (((Convention (gnat_entity
)
3584 == Convention_Fortran
)
3585 || (Convention (gnat_entity
)
3586 == Convention_COBOL
))
3587 && (INTEGRAL_TYPE_P (gnu_param_type
)
3588 || FLOAT_TYPE_P (gnu_param_type
)))
3589 /* For convention Ada, see if we pass by reference
3591 || (!Has_Foreign_Convention (gnat_entity
)
3592 && default_pass_by_ref (gnu_param_type
)))))
3594 gnu_param_type
= build_reference_type (gnu_param_type
);
3598 else if (Ekind (gnat_param
) != E_In_Parameter
)
3599 copy_in_copy_out_flag
= true;
3601 if (req_by_copy
&& (by_ref_p
|| by_component_ptr_p
))
3602 post_error ("?cannot pass & by copy", gnat_param
);
3604 /* If this is an OUT parameter that isn't passed by reference
3605 and isn't a pointer or aggregate, we don't make a PARM_DECL
3606 for it. Instead, it will be a VAR_DECL created when we process
3607 the procedure. For the special parameter of Valued_Procedure,
3610 An exception is made to cover the RM-6.4.1 rule requiring "by
3611 copy" out parameters with discriminants or implicit initial
3612 values to be handled like in out parameters. These type are
3613 normally built as aggregates, and hence passed by reference,
3614 except for some packed arrays which end up encoded in special
3617 The exception we need to make is then for packed arrays of
3618 records with discriminants or implicit initial values. We have
3619 no light/easy way to check for the latter case, so we merely
3620 check for packed arrays of records. This may lead to useless
3621 copy-in operations, but in very rare cases only, as these would
3622 be exceptions in a set of already exceptional situations. */
3623 if (Ekind (gnat_param
) == E_Out_Parameter
&& !by_ref_p
3624 && ((Is_Valued_Procedure (gnat_entity
) && parmnum
== 0)
3626 && !POINTER_TYPE_P (gnu_param_type
)
3627 && !AGGREGATE_TYPE_P (gnu_param_type
)))
3628 && !(Is_Array_Type (Etype (gnat_param
))
3629 && Is_Packed (Etype (gnat_param
))
3630 && Is_Composite_Type (Component_Type
3631 (Etype (gnat_param
)))))
3632 gnu_param
= NULL_TREE
;
3637 (gnu_param_name
, gnu_param_type
,
3638 by_ref_p
|| by_component_ptr_p
3639 || Ekind (gnat_param
) == E_In_Parameter
);
3641 DECL_BY_REF_P (gnu_param
) = by_ref_p
;
3642 DECL_BY_COMPONENT_PTR_P (gnu_param
) = by_component_ptr_p
;
3643 DECL_BY_DESCRIPTOR_P (gnu_param
) = by_descr_p
;
3644 DECL_POINTS_TO_READONLY_P (gnu_param
)
3645 = (Ekind (gnat_param
) == E_In_Parameter
3646 && (by_ref_p
|| by_component_ptr_p
));
3647 Sloc_to_locus (Sloc (gnat_param
),
3648 &DECL_SOURCE_LOCATION (gnu_param
));
3649 save_gnu_tree (gnat_param
, gnu_param
, false);
3650 gnu_param_list
= chainon (gnu_param
, gnu_param_list
);
3652 /* If a parameter is a pointer, this function may modify
3653 memory through it and thus shouldn't be considered
3654 a pure function. Also, the memory may be modified
3655 between two calls, so they can't be CSE'ed. The latter
3656 case also handles by-ref parameters. */
3657 if (POINTER_TYPE_P (gnu_param_type
)
3658 || TYPE_FAT_POINTER_P (gnu_param_type
))
3662 if (copy_in_copy_out_flag
)
3664 if (!has_copy_in_out
)
3666 gcc_assert (TREE_CODE (gnu_return_type
) == VOID_TYPE
);
3667 gnu_return_type
= make_node (RECORD_TYPE
);
3668 TYPE_NAME (gnu_return_type
) = get_identifier ("RETURN");
3669 has_copy_in_out
= true;
3672 gnu_field
= create_field_decl (gnu_param_name
, gnu_param_type
,
3673 gnu_return_type
, 0, 0, 0, 0);
3674 Sloc_to_locus (Sloc (gnat_param
),
3675 &DECL_SOURCE_LOCATION (gnu_field
));
3676 TREE_CHAIN (gnu_field
) = gnu_field_list
;
3677 gnu_field_list
= gnu_field
;
3678 gnu_return_list
= tree_cons (gnu_field
, gnu_param
,
3683 /* Do not compute record for out parameters if subprogram is
3684 stubbed since structures are incomplete for the back-end. */
3686 && Convention (gnat_entity
) != Convention_Stubbed
)
3688 /* If all types are not complete, defer emission of debug
3689 information for this record types. Otherwise, we risk emitting
3690 debug information for a dummy type contained in the fields
3692 finish_record_type (gnu_return_type
, nreverse (gnu_field_list
),
3693 false, defer_incomplete_level
);
3695 if (defer_incomplete_level
)
3697 debug_deferred
= true;
3698 defer_debug_level
++;
3700 defer_debug_incomplete_list
3701 = tree_cons (NULL_TREE
, gnu_return_type
,
3702 defer_debug_incomplete_list
);
3706 /* If we have a CICO list but it has only one entry, we convert
3707 this function into a function that simply returns that one
3709 if (list_length (gnu_return_list
) == 1)
3710 gnu_return_type
= TREE_TYPE (TREE_PURPOSE (gnu_return_list
));
3712 if (Has_Stdcall_Convention (gnat_entity
))
3715 = (struct attrib
*) xmalloc (sizeof (struct attrib
));
3717 attr
->next
= attr_list
;
3718 attr
->type
= ATTR_MACHINE_ATTRIBUTE
;
3719 attr
->name
= get_identifier ("stdcall");
3720 attr
->args
= NULL_TREE
;
3721 attr
->error_point
= gnat_entity
;
3725 /* Both lists ware built in reverse. */
3726 gnu_param_list
= nreverse (gnu_param_list
);
3727 gnu_return_list
= nreverse (gnu_return_list
);
3730 = create_subprog_type (gnu_return_type
, gnu_param_list
,
3731 gnu_return_list
, returns_unconstrained
,
3733 Function_Returns_With_DSP (gnat_entity
),
3734 returns_by_target_ptr
);
3736 /* A subprogram (something that doesn't return anything) shouldn't
3737 be considered Pure since there would be no reason for such a
3738 subprogram. Note that procedures with Out (or In Out) parameters
3739 have already been converted into a function with a return type. */
3740 if (TREE_CODE (gnu_return_type
) == VOID_TYPE
)
3744 = build_qualified_type (gnu_type
,
3745 (TYPE_QUALS (gnu_type
)
3746 | (TYPE_QUAL_CONST
* pure_flag
)
3747 | (TYPE_QUAL_VOLATILE
* volatile_flag
)));
3749 Sloc_to_locus (Sloc (gnat_entity
), &input_location
);
3751 /* If we have a builtin decl for that function, check the signatures
3752 compatibilities. If the signatures are compatible, use the builtin
3753 decl. If they are not, we expect the checker predicate to have
3754 posted the appropriate errors, and just continue with what we have
3756 if (gnu_builtin_decl
)
3758 tree gnu_builtin_type
= TREE_TYPE (gnu_builtin_decl
);
3760 if (compatible_signatures_p (gnu_type
, gnu_builtin_type
))
3762 gnu_decl
= gnu_builtin_decl
;
3763 gnu_type
= gnu_builtin_type
;
3768 /* If there was no specified Interface_Name and the external and
3769 internal names of the subprogram are the same, only use the
3770 internal name to allow disambiguation of nested subprograms. */
3771 if (No (Interface_Name (gnat_entity
)) && gnu_ext_name
== gnu_entity_id
)
3772 gnu_ext_name
= NULL_TREE
;
3774 /* If we are defining the subprogram and it has an Address clause
3775 we must get the address expression from the saved GCC tree for the
3776 subprogram if it has a Freeze_Node. Otherwise, we elaborate
3777 the address expression here since the front-end has guaranteed
3778 in that case that the elaboration has no effects. If there is
3779 an Address clause and we are not defining the object, just
3780 make it a constant. */
3781 if (Present (Address_Clause (gnat_entity
)))
3783 tree gnu_address
= NULL_TREE
;
3787 = (present_gnu_tree (gnat_entity
)
3788 ? get_gnu_tree (gnat_entity
)
3789 : gnat_to_gnu (Expression (Address_Clause (gnat_entity
))));
3791 save_gnu_tree (gnat_entity
, NULL_TREE
, false);
3793 gnu_type
= build_reference_type (gnu_type
);
3795 gnu_address
= convert (gnu_type
, gnu_address
);
3798 = create_var_decl (gnu_entity_id
, gnu_ext_name
, gnu_type
,
3799 gnu_address
, false, Is_Public (gnat_entity
),
3800 extern_flag
, false, NULL
, gnat_entity
);
3801 DECL_BY_REF_P (gnu_decl
) = 1;
3804 else if (kind
== E_Subprogram_Type
)
3805 gnu_decl
= create_type_decl (gnu_entity_id
, gnu_type
, attr_list
,
3806 !Comes_From_Source (gnat_entity
),
3807 debug_info_p
&& !defer_incomplete_level
,
3811 gnu_decl
= create_subprog_decl (gnu_entity_id
, gnu_ext_name
,
3812 gnu_type
, gnu_param_list
,
3813 inline_flag
, public_flag
,
3814 extern_flag
, attr_list
,
3816 DECL_STUBBED_P (gnu_decl
)
3817 = Convention (gnat_entity
) == Convention_Stubbed
;
3822 case E_Incomplete_Type
:
3823 case E_Private_Type
:
3824 case E_Limited_Private_Type
:
3825 case E_Record_Type_With_Private
:
3826 case E_Private_Subtype
:
3827 case E_Limited_Private_Subtype
:
3828 case E_Record_Subtype_With_Private
:
3830 /* If this type does not have a full view in the unit we are
3831 compiling, then just get the type from its Etype. */
3832 if (No (Full_View (gnat_entity
)))
3834 /* If this is an incomplete type with no full view, it must be
3835 either a limited view brought in by a limited_with clause, in
3836 which case we use the non-limited view, or a Taft Amendement
3837 type, in which case we just return a dummy type. */
3838 if (kind
== E_Incomplete_Type
)
3840 if (From_With_Type (gnat_entity
)
3841 && Present (Non_Limited_View (gnat_entity
)))
3842 gnu_decl
= gnat_to_gnu_entity (Non_Limited_View (gnat_entity
),
3845 gnu_type
= make_dummy_type (gnat_entity
);
3848 else if (Present (Underlying_Full_View (gnat_entity
)))
3849 gnu_decl
= gnat_to_gnu_entity (Underlying_Full_View (gnat_entity
),
3853 gnu_decl
= gnat_to_gnu_entity (Etype (gnat_entity
),
3855 maybe_present
= true;
3861 /* Otherwise, if we are not defining the type now, get the
3862 type from the full view. But always get the type from the full
3863 view for define on use types, since otherwise we won't see them! */
3865 else if (!definition
3866 || (Is_Itype (Full_View (gnat_entity
))
3867 && No (Freeze_Node (gnat_entity
)))
3868 || (Is_Itype (gnat_entity
)
3869 && No (Freeze_Node (Full_View (gnat_entity
)))))
3871 gnu_decl
= gnat_to_gnu_entity (Full_View (gnat_entity
),
3873 maybe_present
= true;
3877 /* For incomplete types, make a dummy type entry which will be
3879 gnu_type
= make_dummy_type (gnat_entity
);
3881 /* Save this type as the full declaration's type so we can do any needed
3882 updates when we see it. */
3883 gnu_decl
= create_type_decl (gnu_entity_id
, gnu_type
, attr_list
,
3884 !Comes_From_Source (gnat_entity
),
3885 debug_info_p
, gnat_entity
);
3886 save_gnu_tree (Full_View (gnat_entity
), gnu_decl
, false);
3889 /* Simple class_wide types are always viewed as their root_type
3890 by Gigi unless an Equivalent_Type is specified. */
3891 case E_Class_Wide_Type
:
3892 if (Present (Equivalent_Type (gnat_entity
)))
3893 gnu_type
= gnat_to_gnu_type (Equivalent_Type (gnat_entity
));
3895 gnu_type
= gnat_to_gnu_type (Root_Type (gnat_entity
));
3897 maybe_present
= true;
3901 case E_Task_Subtype
:
3902 case E_Protected_Type
:
3903 case E_Protected_Subtype
:
3904 if (type_annotate_only
&& No (Corresponding_Record_Type (gnat_entity
)))
3905 gnu_type
= void_type_node
;
3907 gnu_type
= gnat_to_gnu_type (Corresponding_Record_Type (gnat_entity
));
3909 maybe_present
= true;
3913 gnu_decl
= create_label_decl (gnu_entity_id
);
3918 /* Nothing at all to do here, so just return an ERROR_MARK and claim
3919 we've already saved it, so we don't try to. */
3920 gnu_decl
= error_mark_node
;
3928 /* If we had a case where we evaluated another type and it might have
3929 defined this one, handle it here. */
3930 if (maybe_present
&& present_gnu_tree (gnat_entity
))
3932 gnu_decl
= get_gnu_tree (gnat_entity
);
3936 /* If we are processing a type and there is either no decl for it or
3937 we just made one, do some common processing for the type, such as
3938 handling alignment and possible padding. */
3940 if ((!gnu_decl
|| this_made_decl
) && IN (kind
, Type_Kind
))
3942 if (Is_Tagged_Type (gnat_entity
)
3943 || Is_Class_Wide_Equivalent_Type (gnat_entity
))
3944 TYPE_ALIGN_OK (gnu_type
) = 1;
3946 if (AGGREGATE_TYPE_P (gnu_type
) && Is_By_Reference_Type (gnat_entity
))
3947 TYPE_BY_REFERENCE_P (gnu_type
) = 1;
3949 /* ??? Don't set the size for a String_Literal since it is either
3950 confirming or we don't handle it properly (if the low bound is
3952 if (!gnu_size
&& kind
!= E_String_Literal_Subtype
)
3953 gnu_size
= validate_size (Esize (gnat_entity
), gnu_type
, gnat_entity
,
3955 Has_Size_Clause (gnat_entity
));
3957 /* If a size was specified, see if we can make a new type of that size
3958 by rearranging the type, for example from a fat to a thin pointer. */
3962 = make_type_from_size (gnu_type
, gnu_size
,
3963 Has_Biased_Representation (gnat_entity
));
3965 if (operand_equal_p (TYPE_SIZE (gnu_type
), gnu_size
, 0)
3966 && operand_equal_p (rm_size (gnu_type
), gnu_size
, 0))
3970 /* If the alignment hasn't already been processed and this is
3971 not an unconstrained array, see if an alignment is specified.
3972 If not, we pick a default alignment for atomic objects. */
3973 if (align
!= 0 || TREE_CODE (gnu_type
) == UNCONSTRAINED_ARRAY_TYPE
)
3975 else if (Known_Alignment (gnat_entity
))
3976 align
= validate_alignment (Alignment (gnat_entity
), gnat_entity
,
3977 TYPE_ALIGN (gnu_type
));
3978 else if (Is_Atomic (gnat_entity
) && !gnu_size
3979 && host_integerp (TYPE_SIZE (gnu_type
), 1)
3980 && integer_pow2p (TYPE_SIZE (gnu_type
)))
3981 align
= MIN (BIGGEST_ALIGNMENT
,
3982 tree_low_cst (TYPE_SIZE (gnu_type
), 1));
3983 else if (Is_Atomic (gnat_entity
) && gnu_size
3984 && host_integerp (gnu_size
, 1)
3985 && integer_pow2p (gnu_size
))
3986 align
= MIN (BIGGEST_ALIGNMENT
, tree_low_cst (gnu_size
, 1));
3988 /* See if we need to pad the type. If we did, and made a record,
3989 the name of the new type may be changed. So get it back for
3990 us when we make the new TYPE_DECL below. */
3991 gnu_type
= maybe_pad_type (gnu_type
, gnu_size
, align
, gnat_entity
, "PAD",
3992 true, definition
, false);
3993 if (TREE_CODE (gnu_type
) == RECORD_TYPE
3994 && TYPE_IS_PADDING_P (gnu_type
))
3996 gnu_entity_id
= TYPE_NAME (gnu_type
);
3997 if (TREE_CODE (gnu_entity_id
) == TYPE_DECL
)
3998 gnu_entity_id
= DECL_NAME (gnu_entity_id
);
4001 set_rm_size (RM_Size (gnat_entity
), gnu_type
, gnat_entity
);
4003 /* If we are at global level, GCC will have applied variable_size to
4004 the type, but that won't have done anything. So, if it's not
4005 a constant or self-referential, call elaborate_expression_1 to
4006 make a variable for the size rather than calculating it each time.
4007 Handle both the RM size and the actual size. */
4008 if (global_bindings_p ()
4009 && TYPE_SIZE (gnu_type
)
4010 && !TREE_CONSTANT (TYPE_SIZE (gnu_type
))
4011 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type
)))
4013 if (TREE_CODE (gnu_type
) == RECORD_TYPE
4014 && operand_equal_p (TYPE_ADA_SIZE (gnu_type
),
4015 TYPE_SIZE (gnu_type
), 0))
4017 TYPE_SIZE (gnu_type
)
4018 = elaborate_expression_1 (gnat_entity
, gnat_entity
,
4019 TYPE_SIZE (gnu_type
),
4020 get_identifier ("SIZE"),
4022 SET_TYPE_ADA_SIZE (gnu_type
, TYPE_SIZE (gnu_type
));
4026 TYPE_SIZE (gnu_type
)
4027 = elaborate_expression_1 (gnat_entity
, gnat_entity
,
4028 TYPE_SIZE (gnu_type
),
4029 get_identifier ("SIZE"),
4032 /* ??? For now, store the size as a multiple of the alignment
4033 in bytes so that we can see the alignment from the tree. */
4034 TYPE_SIZE_UNIT (gnu_type
)
4036 (MULT_EXPR
, sizetype
,
4037 elaborate_expression_1
4038 (gnat_entity
, gnat_entity
,
4039 build_binary_op (EXACT_DIV_EXPR
, sizetype
,
4040 TYPE_SIZE_UNIT (gnu_type
),
4041 size_int (TYPE_ALIGN (gnu_type
)
4043 get_identifier ("SIZE_A_UNIT"),
4045 size_int (TYPE_ALIGN (gnu_type
) / BITS_PER_UNIT
));
4047 if (TREE_CODE (gnu_type
) == RECORD_TYPE
)
4050 elaborate_expression_1 (gnat_entity
,
4052 TYPE_ADA_SIZE (gnu_type
),
4053 get_identifier ("RM_SIZE"),
4058 /* If this is a record type or subtype, call elaborate_expression_1 on
4059 any field position. Do this for both global and local types.
4060 Skip any fields that we haven't made trees for to avoid problems with
4061 class wide types. */
4062 if (IN (kind
, Record_Kind
))
4063 for (gnat_temp
= First_Entity (gnat_entity
); Present (gnat_temp
);
4064 gnat_temp
= Next_Entity (gnat_temp
))
4065 if (Ekind (gnat_temp
) == E_Component
&& present_gnu_tree (gnat_temp
))
4067 tree gnu_field
= get_gnu_tree (gnat_temp
);
4069 /* ??? Unfortunately, GCC needs to be able to prove the
4070 alignment of this offset and if it's a variable, it can't.
4071 In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but
4072 right now, we have to put in an explicit multiply and
4073 divide by that value. */
4074 if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field
)))
4075 DECL_FIELD_OFFSET (gnu_field
)
4077 (MULT_EXPR
, sizetype
,
4078 elaborate_expression_1
4079 (gnat_temp
, gnat_temp
,
4080 build_binary_op (EXACT_DIV_EXPR
, sizetype
,
4081 DECL_FIELD_OFFSET (gnu_field
),
4082 size_int (DECL_OFFSET_ALIGN (gnu_field
)
4084 get_identifier ("OFFSET"),
4086 size_int (DECL_OFFSET_ALIGN (gnu_field
) / BITS_PER_UNIT
));
4089 gnu_type
= build_qualified_type (gnu_type
,
4090 (TYPE_QUALS (gnu_type
)
4091 | (TYPE_QUAL_VOLATILE
4092 * Treat_As_Volatile (gnat_entity
))));
4094 if (Is_Atomic (gnat_entity
))
4095 check_ok_for_atomic (gnu_type
, gnat_entity
, false);
4097 if (Known_Alignment (gnat_entity
))
4098 TYPE_USER_ALIGN (gnu_type
) = 1;
4101 gnu_decl
= create_type_decl (gnu_entity_id
, gnu_type
, attr_list
,
4102 !Comes_From_Source (gnat_entity
),
4103 debug_info_p
, gnat_entity
);
4105 TREE_TYPE (gnu_decl
) = gnu_type
;
4108 if (IN (kind
, Type_Kind
) && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl
)))
4110 gnu_type
= TREE_TYPE (gnu_decl
);
4112 /* Back-annotate the Alignment of the type if not already in the
4113 tree. Likewise for sizes. */
4114 if (Unknown_Alignment (gnat_entity
))
4115 Set_Alignment (gnat_entity
,
4116 UI_From_Int (TYPE_ALIGN (gnu_type
) / BITS_PER_UNIT
));
4118 if (Unknown_Esize (gnat_entity
) && TYPE_SIZE (gnu_type
))
4120 /* If the size is self-referential, we annotate the maximum
4121 value of that size. */
4122 tree gnu_size
= TYPE_SIZE (gnu_type
);
4124 if (CONTAINS_PLACEHOLDER_P (gnu_size
))
4125 gnu_size
= max_size (gnu_size
, true);
4127 Set_Esize (gnat_entity
, annotate_value (gnu_size
));
4129 if (type_annotate_only
&& Is_Tagged_Type (gnat_entity
))
4131 /* In this mode the tag and the parent components are not
4132 generated by the front-end, so the sizes must be adjusted
4138 if (Is_Derived_Type (gnat_entity
))
4141 = UI_To_Int (Esize (Etype (Base_Type (gnat_entity
))));
4142 Set_Alignment (gnat_entity
,
4143 Alignment (Etype (Base_Type (gnat_entity
))));
4146 size_offset
= POINTER_SIZE
;
4148 new_size
= UI_To_Int (Esize (gnat_entity
)) + size_offset
;
4149 Set_Esize (gnat_entity
,
4150 UI_From_Int (((new_size
+ (POINTER_SIZE
- 1))
4151 / POINTER_SIZE
) * POINTER_SIZE
));
4152 Set_RM_Size (gnat_entity
, Esize (gnat_entity
));
4156 if (Unknown_RM_Size (gnat_entity
) && rm_size (gnu_type
))
4157 Set_RM_Size (gnat_entity
, annotate_value (rm_size (gnu_type
)));
4160 if (!Comes_From_Source (gnat_entity
) && DECL_P (gnu_decl
))
4161 DECL_ARTIFICIAL (gnu_decl
) = 1;
4163 if (!debug_info_p
&& DECL_P (gnu_decl
)
4164 && TREE_CODE (gnu_decl
) != FUNCTION_DECL
4165 && No (Renamed_Object (gnat_entity
)))
4166 DECL_IGNORED_P (gnu_decl
) = 1;
4168 /* If we haven't already, associate the ..._DECL node that we just made with
4169 the input GNAT entity node. */
4171 save_gnu_tree (gnat_entity
, gnu_decl
, false);
4173 /* If this is an enumeral or floating-point type, we were not able to set
4174 the bounds since they refer to the type. These bounds are always static.
4176 For enumeration types, also write debugging information and declare the
4177 enumeration literal table, if needed. */
4179 if ((kind
== E_Enumeration_Type
&& Present (First_Literal (gnat_entity
)))
4180 || (kind
== E_Floating_Point_Type
&& !Vax_Float (gnat_entity
)))
4182 tree gnu_scalar_type
= gnu_type
;
4184 /* If this is a padded type, we need to use the underlying type. */
4185 if (TREE_CODE (gnu_scalar_type
) == RECORD_TYPE
4186 && TYPE_IS_PADDING_P (gnu_scalar_type
))
4187 gnu_scalar_type
= TREE_TYPE (TYPE_FIELDS (gnu_scalar_type
));
4189 /* If this is a floating point type and we haven't set a floating
4190 point type yet, use this in the evaluation of the bounds. */
4191 if (!longest_float_type_node
&& kind
== E_Floating_Point_Type
)
4192 longest_float_type_node
= gnu_type
;
4194 TYPE_MIN_VALUE (gnu_scalar_type
)
4195 = gnat_to_gnu (Type_Low_Bound (gnat_entity
));
4196 TYPE_MAX_VALUE (gnu_scalar_type
)
4197 = gnat_to_gnu (Type_High_Bound (gnat_entity
));
4199 if (TREE_CODE (gnu_scalar_type
) == ENUMERAL_TYPE
)
4201 TYPE_STUB_DECL (gnu_scalar_type
) = gnu_decl
;
4203 /* Since this has both a typedef and a tag, avoid outputting
4205 DECL_ARTIFICIAL (gnu_decl
) = 1;
4206 rest_of_type_compilation (gnu_scalar_type
, global_bindings_p ());
4210 /* If we deferred processing of incomplete types, re-enable it. If there
4211 were no other disables and we have some to process, do so. */
4212 if (this_deferred
&& --defer_incomplete_level
== 0 && defer_incomplete_list
)
4214 struct incomplete
*incp
= defer_incomplete_list
;
4215 struct incomplete
*next
;
4217 defer_incomplete_list
= NULL
;
4218 for (; incp
; incp
= next
)
4223 update_pointer_to (TYPE_MAIN_VARIANT (incp
->old_type
),
4224 gnat_to_gnu_type (incp
->full_type
));
4229 /* If we are not defining this type, see if it's in the incomplete list.
4230 If so, handle that list entry now. */
4231 else if (!definition
)
4233 struct incomplete
*incp
;
4235 for (incp
= defer_incomplete_list
; incp
; incp
= incp
->next
)
4236 if (incp
->old_type
&& incp
->full_type
== gnat_entity
)
4238 update_pointer_to (TYPE_MAIN_VARIANT (incp
->old_type
),
4239 TREE_TYPE (gnu_decl
));
4240 incp
->old_type
= NULL_TREE
;
4244 /* If there are no incomplete types and we have deferred emission
4245 of debug information, check whether we have finished defining
4247 If so, handle the list now. */
4250 defer_debug_level
--;
4252 if (defer_debug_incomplete_list
4253 && !defer_incomplete_level
4254 && !defer_debug_level
)
4258 defer_debug_incomplete_list
= nreverse (defer_debug_incomplete_list
);
4260 for (c
= defer_debug_incomplete_list
; c
; c
= n
)
4263 write_record_type_debug_info (TREE_VALUE (c
));
4266 defer_debug_incomplete_list
= 0;
4272 if (Is_Packed_Array_Type (gnat_entity
)
4273 && Is_Itype (Associated_Node_For_Itype (gnat_entity
))
4274 && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity
)))
4275 && !present_gnu_tree (Associated_Node_For_Itype (gnat_entity
)))
4276 gnat_to_gnu_entity (Associated_Node_For_Itype (gnat_entity
), NULL_TREE
, 0);
4281 /* Similar, but if the returned value is a COMPONENT_REF, return the
4285 gnat_to_gnu_field_decl (Entity_Id gnat_entity
)
4287 tree gnu_field
= gnat_to_gnu_entity (gnat_entity
, NULL_TREE
, 0);
4289 if (TREE_CODE (gnu_field
) == COMPONENT_REF
)
4290 gnu_field
= TREE_OPERAND (gnu_field
, 1);
4295 /* Given GNAT_ENTITY, elaborate all expressions that are required to
4296 be elaborated at the point of its definition, but do nothing else. */
4299 elaborate_entity (Entity_Id gnat_entity
)
4301 switch (Ekind (gnat_entity
))
4303 case E_Signed_Integer_Subtype
:
4304 case E_Modular_Integer_Subtype
:
4305 case E_Enumeration_Subtype
:
4306 case E_Ordinary_Fixed_Point_Subtype
:
4307 case E_Decimal_Fixed_Point_Subtype
:
4308 case E_Floating_Point_Subtype
:
4310 Node_Id gnat_lb
= Type_Low_Bound (gnat_entity
);
4311 Node_Id gnat_hb
= Type_High_Bound (gnat_entity
);
4313 /* ??? Tests for avoiding static constraint error expression
4314 is needed until the front stops generating bogus conversions
4315 on bounds of real types. */
4317 if (!Raises_Constraint_Error (gnat_lb
))
4318 elaborate_expression (gnat_lb
, gnat_entity
, get_identifier ("L"),
4319 1, 0, Needs_Debug_Info (gnat_entity
));
4320 if (!Raises_Constraint_Error (gnat_hb
))
4321 elaborate_expression (gnat_hb
, gnat_entity
, get_identifier ("U"),
4322 1, 0, Needs_Debug_Info (gnat_entity
));
4328 Node_Id full_definition
= Declaration_Node (gnat_entity
);
4329 Node_Id record_definition
= Type_Definition (full_definition
);
4331 /* If this is a record extension, go a level further to find the
4332 record definition. */
4333 if (Nkind (record_definition
) == N_Derived_Type_Definition
)
4334 record_definition
= Record_Extension_Part (record_definition
);
4338 case E_Record_Subtype
:
4339 case E_Private_Subtype
:
4340 case E_Limited_Private_Subtype
:
4341 case E_Record_Subtype_With_Private
:
4342 if (Is_Constrained (gnat_entity
)
4343 && Has_Discriminants (Base_Type (gnat_entity
))
4344 && Present (Discriminant_Constraint (gnat_entity
)))
4346 Node_Id gnat_discriminant_expr
;
4347 Entity_Id gnat_field
;
4349 for (gnat_field
= First_Discriminant (Base_Type (gnat_entity
)),
4350 gnat_discriminant_expr
4351 = First_Elmt (Discriminant_Constraint (gnat_entity
));
4352 Present (gnat_field
);
4353 gnat_field
= Next_Discriminant (gnat_field
),
4354 gnat_discriminant_expr
= Next_Elmt (gnat_discriminant_expr
))
4355 /* ??? For now, ignore access discriminants. */
4356 if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr
))))
4357 elaborate_expression (Node (gnat_discriminant_expr
),
4359 get_entity_name (gnat_field
), 1, 0, 0);
4366 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
4367 any entities on its entity chain similarly. */
4370 mark_out_of_scope (Entity_Id gnat_entity
)
4372 Entity_Id gnat_sub_entity
;
4373 unsigned int kind
= Ekind (gnat_entity
);
4375 /* If this has an entity list, process all in the list. */
4376 if (IN (kind
, Class_Wide_Kind
) || IN (kind
, Concurrent_Kind
)
4377 || IN (kind
, Private_Kind
)
4378 || kind
== E_Block
|| kind
== E_Entry
|| kind
== E_Entry_Family
4379 || kind
== E_Function
|| kind
== E_Generic_Function
4380 || kind
== E_Generic_Package
|| kind
== E_Generic_Procedure
4381 || kind
== E_Loop
|| kind
== E_Operator
|| kind
== E_Package
4382 || kind
== E_Package_Body
|| kind
== E_Procedure
4383 || kind
== E_Record_Type
|| kind
== E_Record_Subtype
4384 || kind
== E_Subprogram_Body
|| kind
== E_Subprogram_Type
)
4385 for (gnat_sub_entity
= First_Entity (gnat_entity
);
4386 Present (gnat_sub_entity
);
4387 gnat_sub_entity
= Next_Entity (gnat_sub_entity
))
4388 if (Scope (gnat_sub_entity
) == gnat_entity
4389 && gnat_sub_entity
!= gnat_entity
)
4390 mark_out_of_scope (gnat_sub_entity
);
4392 /* Now clear this if it has been defined, but only do so if it isn't
4393 a subprogram or parameter. We could refine this, but it isn't
4394 worth it. If this is statically allocated, it is supposed to
4395 hang around out of cope. */
4396 if (present_gnu_tree (gnat_entity
) && !Is_Statically_Allocated (gnat_entity
)
4397 && kind
!= E_Procedure
&& kind
!= E_Function
&& !IN (kind
, Formal_Kind
))
4399 save_gnu_tree (gnat_entity
, NULL_TREE
, true);
4400 save_gnu_tree (gnat_entity
, error_mark_node
, true);
4404 /* Set the alias set of GNU_NEW_TYPE to be that of GNU_OLD_TYPE. If this
4405 is a multi-dimensional array type, do this recursively. */
4408 copy_alias_set (tree gnu_new_type
, tree gnu_old_type
)
4410 /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case
4411 of a one-dimensional array, since the padding has the same alias set
4412 as the field type, but if it's a multi-dimensional array, we need to
4413 see the inner types. */
4414 while (TREE_CODE (gnu_old_type
) == RECORD_TYPE
4415 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type
)
4416 || TYPE_IS_PADDING_P (gnu_old_type
)))
4417 gnu_old_type
= TREE_TYPE (TYPE_FIELDS (gnu_old_type
));
4419 /* We need to be careful here in case GNU_OLD_TYPE is an unconstrained
4420 array. In that case, it doesn't have the same shape as GNU_NEW_TYPE,
4421 so we need to go down to what does. */
4422 if (TREE_CODE (gnu_old_type
) == UNCONSTRAINED_ARRAY_TYPE
)
4424 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type
))));
4426 if (TREE_CODE (gnu_new_type
) == ARRAY_TYPE
4427 && TREE_CODE (TREE_TYPE (gnu_new_type
)) == ARRAY_TYPE
4428 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type
)))
4429 copy_alias_set (TREE_TYPE (gnu_new_type
), TREE_TYPE (gnu_old_type
));
4431 TYPE_ALIAS_SET (gnu_new_type
) = get_alias_set (gnu_old_type
);
4432 record_component_aliases (gnu_new_type
);
4435 /* Return a TREE_LIST describing the substitutions needed to reflect
4436 discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add
4437 them to GNU_LIST. If GNAT_TYPE is not specified, use the base type
4438 of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE
4439 gives the tree for the discriminant and TREE_VALUES is the replacement
4440 value. They are in the form of operands to substitute_in_expr.
4441 DEFINITION is as in gnat_to_gnu_entity. */
4444 substitution_list (Entity_Id gnat_subtype
, Entity_Id gnat_type
,
4445 tree gnu_list
, bool definition
)
4447 Entity_Id gnat_discrim
;
4451 gnat_type
= Implementation_Base_Type (gnat_subtype
);
4453 if (Has_Discriminants (gnat_type
))
4454 for (gnat_discrim
= First_Stored_Discriminant (gnat_type
),
4455 gnat_value
= First_Elmt (Stored_Constraint (gnat_subtype
));
4456 Present (gnat_discrim
);
4457 gnat_discrim
= Next_Stored_Discriminant (gnat_discrim
),
4458 gnat_value
= Next_Elmt (gnat_value
))
4459 /* Ignore access discriminants. */
4460 if (!Is_Access_Type (Etype (Node (gnat_value
))))
4461 gnu_list
= tree_cons (gnat_to_gnu_field_decl (gnat_discrim
),
4462 elaborate_expression
4463 (Node (gnat_value
), gnat_subtype
,
4464 get_entity_name (gnat_discrim
), definition
,
4471 /* For the following two functions: for each GNAT entity, the GCC
4472 tree node used as a dummy for that entity, if any. */
4474 static GTY((length ("max_gnat_nodes"))) tree
* dummy_node_table
;
4476 /* Initialize the above table. */
4479 init_dummy_type (void)
4483 dummy_node_table
= (tree
*) ggc_alloc (max_gnat_nodes
* sizeof (tree
));
4485 for (gnat_node
= 0; gnat_node
< max_gnat_nodes
; gnat_node
++)
4486 dummy_node_table
[gnat_node
] = NULL_TREE
;
4488 dummy_node_table
-= First_Node_Id
;
4491 /* Make a dummy type corresponding to GNAT_TYPE. */
4494 make_dummy_type (Entity_Id gnat_type
)
4496 Entity_Id gnat_underlying
;
4498 enum tree_code code
;
4500 /* Find a full type for GNAT_TYPE, taking into account any class wide
4502 if (Is_Class_Wide_Type (gnat_type
) && Present (Equivalent_Type (gnat_type
)))
4503 gnat_type
= Equivalent_Type (gnat_type
);
4504 else if (Ekind (gnat_type
) == E_Class_Wide_Type
)
4505 gnat_type
= Root_Type (gnat_type
);
4507 for (gnat_underlying
= gnat_type
;
4508 (IN (Ekind (gnat_underlying
), Incomplete_Or_Private_Kind
)
4509 && Present (Full_View (gnat_underlying
)));
4510 gnat_underlying
= Full_View (gnat_underlying
))
4513 /* If it there already a dummy type, use that one. Else make one. */
4514 if (dummy_node_table
[gnat_underlying
])
4515 return dummy_node_table
[gnat_underlying
];
4517 /* If this is a record, make this a RECORD_TYPE or UNION_TYPE; else make
4518 it an ENUMERAL_TYPE. */
4519 if (Is_Record_Type (gnat_underlying
))
4521 Node_Id component_list
4522 = Component_List (Type_Definition
4524 (Implementation_Base_Type (gnat_underlying
))));
4527 /* Make this a UNION_TYPE unless it's either not an Unchecked_Union or
4528 we have a non-discriminant field outside a variant. In either case,
4529 it's a RECORD_TYPE. */
4531 if (!Is_Unchecked_Union (gnat_underlying
))
4534 for (component
= First_Non_Pragma (Component_Items (component_list
));
4535 Present (component
); component
= Next_Non_Pragma (component
))
4536 if (Ekind (Defining_Entity (component
)) == E_Component
)
4540 code
= ENUMERAL_TYPE
;
4542 gnu_type
= make_node (code
);
4543 TYPE_NAME (gnu_type
) = get_entity_name (gnat_type
);
4544 TYPE_DUMMY_P (gnu_type
) = 1;
4545 if (AGGREGATE_TYPE_P (gnu_type
))
4546 TYPE_STUB_DECL (gnu_type
) = build_decl (TYPE_DECL
, NULL_TREE
, gnu_type
);
4548 dummy_node_table
[gnat_underlying
] = gnu_type
;
4553 /* Return true if the size represented by GNU_SIZE can be handled by an
4554 allocation. If STATIC_P is true, consider only what can be done with a
4555 static allocation. */
4558 allocatable_size_p (tree gnu_size
, bool static_p
)
4560 HOST_WIDE_INT our_size
;
4562 /* If this is not a static allocation, the only case we want to forbid
4563 is an overflowing size. That will be converted into a raise a
4566 return !(TREE_CODE (gnu_size
) == INTEGER_CST
4567 && TREE_CONSTANT_OVERFLOW (gnu_size
));
4569 /* Otherwise, we need to deal with both variable sizes and constant
4570 sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT
4571 since assemblers may not like very large sizes. */
4572 if (!host_integerp (gnu_size
, 1))
4575 our_size
= tree_low_cst (gnu_size
, 1);
4576 return (int) our_size
== our_size
;
4579 /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */
4582 prepend_attributes (Entity_Id gnat_entity
, struct attrib
** attr_list
)
4586 for (gnat_temp
= First_Rep_Item (gnat_entity
); Present (gnat_temp
);
4587 gnat_temp
= Next_Rep_Item (gnat_temp
))
4588 if (Nkind (gnat_temp
) == N_Pragma
)
4590 struct attrib
*attr
;
4591 tree gnu_arg0
= NULL_TREE
, gnu_arg1
= NULL_TREE
;
4592 Node_Id gnat_assoc
= Pragma_Argument_Associations (gnat_temp
);
4593 enum attr_type etype
;
4595 if (Present (gnat_assoc
) && Present (First (gnat_assoc
))
4596 && Present (Next (First (gnat_assoc
)))
4597 && (Nkind (Expression (Next (First (gnat_assoc
))))
4598 == N_String_Literal
))
4600 gnu_arg0
= get_identifier (TREE_STRING_POINTER
4603 (First (gnat_assoc
))))));
4604 if (Present (Next (Next (First (gnat_assoc
))))
4605 && (Nkind (Expression (Next (Next (First (gnat_assoc
)))))
4606 == N_String_Literal
))
4607 gnu_arg1
= get_identifier (TREE_STRING_POINTER
4611 (First (gnat_assoc
)))))));
4614 switch (Get_Pragma_Id (Chars (gnat_temp
)))
4616 case Pragma_Machine_Attribute
:
4617 etype
= ATTR_MACHINE_ATTRIBUTE
;
4620 case Pragma_Linker_Alias
:
4621 etype
= ATTR_LINK_ALIAS
;
4624 case Pragma_Linker_Section
:
4625 etype
= ATTR_LINK_SECTION
;
4628 case Pragma_Linker_Constructor
:
4629 etype
= ATTR_LINK_CONSTRUCTOR
;
4632 case Pragma_Linker_Destructor
:
4633 etype
= ATTR_LINK_DESTRUCTOR
;
4636 case Pragma_Weak_External
:
4637 etype
= ATTR_WEAK_EXTERNAL
;
4644 attr
= (struct attrib
*) xmalloc (sizeof (struct attrib
));
4645 attr
->next
= *attr_list
;
4647 attr
->name
= gnu_arg0
;
4649 /* If we have an argument specified together with an attribute name,
4650 make it a single TREE_VALUE entry in a list of arguments, as GCC
4652 if (gnu_arg1
!= NULL_TREE
)
4653 attr
->args
= build_tree_list (NULL_TREE
, gnu_arg1
);
4655 attr
->args
= NULL_TREE
;
4658 = Present (Next (First (gnat_assoc
)))
4659 ? Expression (Next (First (gnat_assoc
))) : gnat_temp
;
4664 /* Get the unpadded version of a GNAT type. */
4667 get_unpadded_type (Entity_Id gnat_entity
)
4669 tree type
= gnat_to_gnu_type (gnat_entity
);
4671 if (TREE_CODE (type
) == RECORD_TYPE
&& TYPE_IS_PADDING_P (type
))
4672 type
= TREE_TYPE (TYPE_FIELDS (type
));
4677 /* Called when we need to protect a variable object using a save_expr. */
4680 maybe_variable (tree gnu_operand
)
4682 if (TREE_CONSTANT (gnu_operand
) || TREE_READONLY (gnu_operand
)
4683 || TREE_CODE (gnu_operand
) == SAVE_EXPR
4684 || TREE_CODE (gnu_operand
) == NULL_EXPR
)
4687 if (TREE_CODE (gnu_operand
) == UNCONSTRAINED_ARRAY_REF
)
4689 tree gnu_result
= build1 (UNCONSTRAINED_ARRAY_REF
,
4690 TREE_TYPE (gnu_operand
),
4691 variable_size (TREE_OPERAND (gnu_operand
, 0)));
4693 TREE_READONLY (gnu_result
) = TREE_STATIC (gnu_result
)
4694 = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand
)));
4698 return variable_size (gnu_operand
);
4701 /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
4702 type definition (either a bound or a discriminant value) for GNAT_ENTITY,
4703 return the GCC tree to use for that expression. GNU_NAME is the
4704 qualification to use if an external name is appropriate and DEFINITION is
4705 nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero,
4706 we need a result. Otherwise, we are just elaborating this for
4707 side-effects. If NEED_DEBUG is nonzero we need the symbol for debugging
4708 purposes even if it isn't needed for code generation. */
4711 elaborate_expression (Node_Id gnat_expr
, Entity_Id gnat_entity
,
4712 tree gnu_name
, bool definition
, bool need_value
,
4717 /* If we already elaborated this expression (e.g., it was involved
4718 in the definition of a private type), use the old value. */
4719 if (present_gnu_tree (gnat_expr
))
4720 return get_gnu_tree (gnat_expr
);
4722 /* If we don't need a value and this is static or a discriminant, we
4723 don't need to do anything. */
4724 else if (!need_value
4725 && (Is_OK_Static_Expression (gnat_expr
)
4726 || (Nkind (gnat_expr
) == N_Identifier
4727 && Ekind (Entity (gnat_expr
)) == E_Discriminant
)))
4730 /* Otherwise, convert this tree to its GCC equivalent. */
4732 = elaborate_expression_1 (gnat_expr
, gnat_entity
, gnat_to_gnu (gnat_expr
),
4733 gnu_name
, definition
, need_debug
);
4735 /* Save the expression in case we try to elaborate this entity again. Since
4736 this is not a DECL, don't check it. Don't save if it's a discriminant. */
4737 if (!CONTAINS_PLACEHOLDER_P (gnu_expr
))
4738 save_gnu_tree (gnat_expr
, gnu_expr
, true);
4740 return need_value
? gnu_expr
: error_mark_node
;
4743 /* Similar, but take a GNU expression. */
4746 elaborate_expression_1 (Node_Id gnat_expr
, Entity_Id gnat_entity
,
4747 tree gnu_expr
, tree gnu_name
, bool definition
,
4750 tree gnu_decl
= NULL_TREE
;
4751 /* Strip any conversions to see if the expression is a readonly variable.
4752 ??? This really should remain readonly, but we have to think about
4753 the typing of the tree here. */
4754 tree gnu_inner_expr
= remove_conversions (gnu_expr
, true);
4755 bool expr_global
= Is_Public (gnat_entity
) || global_bindings_p ();
4758 /* In most cases, we won't see a naked FIELD_DECL here because a
4759 discriminant reference will have been replaced with a COMPONENT_REF
4760 when the type is being elaborated. However, there are some cases
4761 involving child types where we will. So convert it to a COMPONENT_REF
4762 here. We have to hope it will be at the highest level of the
4763 expression in these cases. */
4764 if (TREE_CODE (gnu_expr
) == FIELD_DECL
)
4765 gnu_expr
= build3 (COMPONENT_REF
, TREE_TYPE (gnu_expr
),
4766 build0 (PLACEHOLDER_EXPR
, DECL_CONTEXT (gnu_expr
)),
4767 gnu_expr
, NULL_TREE
);
4769 /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable
4770 that is a constant, make a variable that is initialized to contain the
4771 bound when the package containing the definition is elaborated. If
4772 this entity is defined at top level and a bound or discriminant value
4773 isn't a constant or a reference to a discriminant, replace the bound
4774 by the variable; otherwise use a SAVE_EXPR if needed. Note that we
4775 rely here on the fact that an expression cannot contain both the
4776 discriminant and some other variable. */
4778 expr_variable
= (!CONSTANT_CLASS_P (gnu_expr
)
4779 && !(TREE_CODE (gnu_inner_expr
) == VAR_DECL
4780 && TREE_READONLY (gnu_inner_expr
))
4781 && !CONTAINS_PLACEHOLDER_P (gnu_expr
));
4783 /* If this is a static expression or contains a discriminant, we don't
4784 need the variable for debugging (and can't elaborate anyway if a
4787 && (Is_OK_Static_Expression (gnat_expr
)
4788 || CONTAINS_PLACEHOLDER_P (gnu_expr
)))
4791 /* Now create the variable if we need it. */
4792 if (need_debug
|| (expr_variable
&& expr_global
))
4794 = create_var_decl (create_concat_name (gnat_entity
,
4795 IDENTIFIER_POINTER (gnu_name
)),
4796 NULL_TREE
, TREE_TYPE (gnu_expr
), gnu_expr
,
4797 !need_debug
, Is_Public (gnat_entity
),
4798 !definition
, false, NULL
, gnat_entity
);
4800 /* We only need to use this variable if we are in global context since GCC
4801 can do the right thing in the local case. */
4802 if (expr_global
&& expr_variable
)
4804 else if (!expr_variable
)
4807 return maybe_variable (gnu_expr
);
4810 /* Create a record type that contains a field of TYPE with a starting bit
4811 position so that it is aligned to ALIGN bits and is SIZE bytes long. */
4814 make_aligning_type (tree type
, int align
, tree size
)
4816 tree record_type
= make_node (RECORD_TYPE
);
4817 tree place
= build0 (PLACEHOLDER_EXPR
, record_type
);
4818 tree size_addr_place
= convert (sizetype
,
4819 build_unary_op (ADDR_EXPR
, NULL_TREE
,
4821 tree name
= TYPE_NAME (type
);
4824 if (TREE_CODE (name
) == TYPE_DECL
)
4825 name
= DECL_NAME (name
);
4827 TYPE_NAME (record_type
) = concat_id_with_name (name
, "_ALIGN");
4829 /* The bit position is obtained by "and"ing the alignment minus 1
4830 with the two's complement of the address and multiplying
4831 by the number of bits per unit. Do all this in sizetype. */
4832 pos
= size_binop (MULT_EXPR
,
4833 convert (bitsizetype
,
4834 size_binop (BIT_AND_EXPR
,
4835 size_diffop (size_zero_node
,
4837 ssize_int ((align
/ BITS_PER_UNIT
)
4841 /* Create the field, with -1 as the 'addressable' indication to avoid the
4842 creation of a bitfield. We don't need one, it would have damaging
4843 consequences on the alignment computation, and create_field_decl would
4844 make one without this special argument, for instance because of the
4845 complex position expression. */
4846 field
= create_field_decl (get_identifier ("F"), type
, record_type
, 1, size
,
4849 finish_record_type (record_type
, field
, true, false);
4850 TYPE_ALIGN (record_type
) = BIGGEST_ALIGNMENT
;
4851 TYPE_SIZE (record_type
)
4852 = size_binop (PLUS_EXPR
,
4853 size_binop (MULT_EXPR
, convert (bitsizetype
, size
),
4855 bitsize_int (align
));
4856 TYPE_SIZE_UNIT (record_type
)
4857 = size_binop (PLUS_EXPR
, size
, size_int (align
/ BITS_PER_UNIT
));
4858 copy_alias_set (record_type
, type
);
4862 /* TYPE is a RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE, with BLKmode that's
4863 being used as the field type of a packed record. See if we can rewrite it
4864 as a record that has a non-BLKmode type, which we can pack tighter. If so,
4865 return the new type. If not, return the original type. */
4868 make_packable_type (tree type
)
4870 tree new_type
= make_node (TREE_CODE (type
));
4871 tree field_list
= NULL_TREE
;
4874 /* Copy the name and flags from the old type to that of the new and set
4875 the alignment to try for an integral type. For QUAL_UNION_TYPE,
4876 also copy the size. */
4877 TYPE_NAME (new_type
) = TYPE_NAME (type
);
4878 TYPE_JUSTIFIED_MODULAR_P (new_type
)
4879 = TYPE_JUSTIFIED_MODULAR_P (type
);
4880 TYPE_CONTAINS_TEMPLATE_P (new_type
) = TYPE_CONTAINS_TEMPLATE_P (type
);
4882 if (TREE_CODE (type
) == RECORD_TYPE
)
4883 TYPE_IS_PADDING_P (new_type
) = TYPE_IS_PADDING_P (type
);
4884 else if (TREE_CODE (type
) == QUAL_UNION_TYPE
)
4886 TYPE_SIZE (new_type
) = TYPE_SIZE (type
);
4887 TYPE_SIZE_UNIT (new_type
) = TYPE_SIZE_UNIT (type
);
4890 TYPE_ALIGN (new_type
)
4891 = ((HOST_WIDE_INT
) 1
4892 << (floor_log2 (tree_low_cst (TYPE_SIZE (type
), 1) - 1) + 1));
4894 /* Now copy the fields, keeping the position and size. */
4895 for (old_field
= TYPE_FIELDS (type
); old_field
;
4896 old_field
= TREE_CHAIN (old_field
))
4898 tree new_field_type
= TREE_TYPE (old_field
);
4901 if (TYPE_MODE (new_field_type
) == BLKmode
4902 && (TREE_CODE (new_field_type
) == RECORD_TYPE
4903 || TREE_CODE (new_field_type
) == UNION_TYPE
4904 || TREE_CODE (new_field_type
) == QUAL_UNION_TYPE
)
4905 && host_integerp (TYPE_SIZE (new_field_type
), 1))
4906 new_field_type
= make_packable_type (new_field_type
);
4908 new_field
= create_field_decl (DECL_NAME (old_field
), new_field_type
,
4909 new_type
, TYPE_PACKED (type
),
4910 DECL_SIZE (old_field
),
4911 bit_position (old_field
),
4912 !DECL_NONADDRESSABLE_P (old_field
));
4914 DECL_INTERNAL_P (new_field
) = DECL_INTERNAL_P (old_field
);
4915 SET_DECL_ORIGINAL_FIELD
4916 (new_field
, (DECL_ORIGINAL_FIELD (old_field
)
4917 ? DECL_ORIGINAL_FIELD (old_field
) : old_field
));
4919 if (TREE_CODE (new_type
) == QUAL_UNION_TYPE
)
4920 DECL_QUALIFIER (new_field
) = DECL_QUALIFIER (old_field
);
4922 TREE_CHAIN (new_field
) = field_list
;
4923 field_list
= new_field
;
4926 finish_record_type (new_type
, nreverse (field_list
), true, true);
4927 copy_alias_set (new_type
, type
);
4928 return TYPE_MODE (new_type
) == BLKmode
? type
: new_type
;
4931 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
4932 if needed. We have already verified that SIZE and TYPE are large enough.
4934 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
4937 IS_USER_TYPE is true if we must be sure we complete the original type.
4939 DEFINITION is true if this type is being defined.
4941 SAME_RM_SIZE is true if the RM_Size of the resulting type is to be
4942 set to its TYPE_SIZE; otherwise, it's set to the RM_Size of the original
4946 maybe_pad_type (tree type
, tree size
, unsigned int align
,
4947 Entity_Id gnat_entity
, const char *name_trailer
,
4948 bool is_user_type
, bool definition
, bool same_rm_size
)
4950 tree orig_size
= TYPE_SIZE (type
);
4954 /* If TYPE is a padded type, see if it agrees with any size and alignment
4955 we were given. If so, return the original type. Otherwise, strip
4956 off the padding, since we will either be returning the inner type
4957 or repadding it. If no size or alignment is specified, use that of
4958 the original padded type. */
4960 if (TREE_CODE (type
) == RECORD_TYPE
&& TYPE_IS_PADDING_P (type
))
4963 || operand_equal_p (round_up (size
,
4964 MAX (align
, TYPE_ALIGN (type
))),
4965 round_up (TYPE_SIZE (type
),
4966 MAX (align
, TYPE_ALIGN (type
))),
4968 && (align
== 0 || align
== TYPE_ALIGN (type
)))
4972 size
= TYPE_SIZE (type
);
4974 align
= TYPE_ALIGN (type
);
4976 type
= TREE_TYPE (TYPE_FIELDS (type
));
4977 orig_size
= TYPE_SIZE (type
);
4980 /* If the size is either not being changed or is being made smaller (which
4981 is not done here (and is only valid for bitfields anyway), show the size
4982 isn't changing. Likewise, clear the alignment if it isn't being
4983 changed. Then return if we aren't doing anything. */
4986 && (operand_equal_p (size
, orig_size
, 0)
4987 || (TREE_CODE (orig_size
) == INTEGER_CST
4988 && tree_int_cst_lt (size
, orig_size
))))
4991 if (align
== TYPE_ALIGN (type
))
4994 if (align
== 0 && !size
)
4997 /* We used to modify the record in place in some cases, but that could
4998 generate incorrect debugging information. So make a new record
5000 record
= make_node (RECORD_TYPE
);
5002 if (Present (gnat_entity
))
5003 TYPE_NAME (record
) = create_concat_name (gnat_entity
, name_trailer
);
5005 /* If we were making a type, complete the original type and give it a
5008 create_type_decl (get_entity_name (gnat_entity
), type
,
5009 NULL
, !Comes_From_Source (gnat_entity
),
5011 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
5012 && DECL_IGNORED_P (TYPE_NAME (type
))),
5015 /* If we are changing the alignment and the input type is a record with
5016 BLKmode and a small constant size, try to make a form that has an
5017 integral mode. That might allow this record to have an integral mode,
5018 which will be much more efficient. There is no point in doing this if a
5019 size is specified unless it is also smaller than the biggest alignment
5020 and it is incorrect to do this if the size of the original type is not a
5021 multiple of the alignment. */
5023 && TREE_CODE (type
) == RECORD_TYPE
5024 && TYPE_MODE (type
) == BLKmode
5025 && host_integerp (orig_size
, 1)
5026 && compare_tree_int (orig_size
, BIGGEST_ALIGNMENT
) <= 0
5028 || (TREE_CODE (size
) == INTEGER_CST
5029 && compare_tree_int (size
, BIGGEST_ALIGNMENT
) <= 0))
5030 && tree_low_cst (orig_size
, 1) % align
== 0)
5031 type
= make_packable_type (type
);
5033 field
= create_field_decl (get_identifier ("F"), type
, record
, 0,
5034 NULL_TREE
, bitsize_zero_node
, 1);
5036 DECL_INTERNAL_P (field
) = 1;
5037 TYPE_SIZE (record
) = size
? size
: orig_size
;
5038 TYPE_SIZE_UNIT (record
)
5039 = (size
? convert (sizetype
,
5040 size_binop (CEIL_DIV_EXPR
, size
, bitsize_unit_node
))
5041 : TYPE_SIZE_UNIT (type
));
5043 TYPE_ALIGN (record
) = align
;
5044 TYPE_IS_PADDING_P (record
) = 1;
5045 TYPE_VOLATILE (record
)
5046 = Present (gnat_entity
) && Treat_As_Volatile (gnat_entity
);
5047 finish_record_type (record
, field
, true, false);
5049 /* Keep the RM_Size of the padded record as that of the old record
5051 SET_TYPE_ADA_SIZE (record
, same_rm_size
? size
: rm_size (type
));
5053 /* Unless debugging information isn't being written for the input type,
5054 write a record that shows what we are a subtype of and also make a
5055 variable that indicates our size, if variable. */
5056 if (TYPE_NAME (record
) && AGGREGATE_TYPE_P (type
)
5057 && (TREE_CODE (TYPE_NAME (type
)) != TYPE_DECL
5058 || !DECL_IGNORED_P (TYPE_NAME (type
))))
5060 tree marker
= make_node (RECORD_TYPE
);
5061 tree name
= (TREE_CODE (TYPE_NAME (record
)) == TYPE_DECL
5062 ? DECL_NAME (TYPE_NAME (record
))
5063 : TYPE_NAME (record
));
5064 tree orig_name
= TYPE_NAME (type
);
5066 if (TREE_CODE (orig_name
) == TYPE_DECL
)
5067 orig_name
= DECL_NAME (orig_name
);
5069 TYPE_NAME (marker
) = concat_id_with_name (name
, "XVS");
5070 finish_record_type (marker
,
5071 create_field_decl (orig_name
, integer_type_node
,
5072 marker
, 0, NULL_TREE
, NULL_TREE
,
5076 if (size
&& TREE_CODE (size
) != INTEGER_CST
&& definition
)
5077 create_var_decl (concat_id_with_name (name
, "XVZ"), NULL_TREE
,
5078 bitsizetype
, TYPE_SIZE (record
), false, false, false,
5079 false, NULL
, gnat_entity
);
5084 if (CONTAINS_PLACEHOLDER_P (orig_size
))
5085 orig_size
= max_size (orig_size
, true);
5087 /* If the size was widened explicitly, maybe give a warning. */
5088 if (size
&& Present (gnat_entity
)
5089 && !operand_equal_p (size
, orig_size
, 0)
5090 && !(TREE_CODE (size
) == INTEGER_CST
5091 && TREE_CODE (orig_size
) == INTEGER_CST
5092 && tree_int_cst_lt (size
, orig_size
)))
5094 Node_Id gnat_error_node
= Empty
;
5096 if (Is_Packed_Array_Type (gnat_entity
))
5097 gnat_entity
= Associated_Node_For_Itype (gnat_entity
);
5099 if ((Ekind (gnat_entity
) == E_Component
5100 || Ekind (gnat_entity
) == E_Discriminant
)
5101 && Present (Component_Clause (gnat_entity
)))
5102 gnat_error_node
= Last_Bit (Component_Clause (gnat_entity
));
5103 else if (Present (Size_Clause (gnat_entity
)))
5104 gnat_error_node
= Expression (Size_Clause (gnat_entity
));
5106 /* Generate message only for entities that come from source, since
5107 if we have an entity created by expansion, the message will be
5108 generated for some other corresponding source entity. */
5109 if (Comes_From_Source (gnat_entity
) && Present (gnat_error_node
))
5110 post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node
,
5112 size_diffop (size
, orig_size
));
5114 else if (*name_trailer
== 'C' && !Is_Internal (gnat_entity
))
5115 post_error_ne_tree ("component of& padded{ by ^ bits}?",
5116 gnat_entity
, gnat_entity
,
5117 size_diffop (size
, orig_size
));
5123 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
5124 the value passed against the list of choices. */
5127 choices_to_gnu (tree operand
, Node_Id choices
)
5131 tree result
= integer_zero_node
;
5132 tree this_test
, low
= 0, high
= 0, single
= 0;
5134 for (choice
= First (choices
); Present (choice
); choice
= Next (choice
))
5136 switch (Nkind (choice
))
5139 low
= gnat_to_gnu (Low_Bound (choice
));
5140 high
= gnat_to_gnu (High_Bound (choice
));
5142 /* There's no good type to use here, so we might as well use
5143 integer_type_node. */
5145 = build_binary_op (TRUTH_ANDIF_EXPR
, integer_type_node
,
5146 build_binary_op (GE_EXPR
, integer_type_node
,
5148 build_binary_op (LE_EXPR
, integer_type_node
,
5153 case N_Subtype_Indication
:
5154 gnat_temp
= Range_Expression (Constraint (choice
));
5155 low
= gnat_to_gnu (Low_Bound (gnat_temp
));
5156 high
= gnat_to_gnu (High_Bound (gnat_temp
));
5159 = build_binary_op (TRUTH_ANDIF_EXPR
, integer_type_node
,
5160 build_binary_op (GE_EXPR
, integer_type_node
,
5162 build_binary_op (LE_EXPR
, integer_type_node
,
5167 case N_Expanded_Name
:
5168 /* This represents either a subtype range, an enumeration
5169 literal, or a constant Ekind says which. If an enumeration
5170 literal or constant, fall through to the next case. */
5171 if (Ekind (Entity (choice
)) != E_Enumeration_Literal
5172 && Ekind (Entity (choice
)) != E_Constant
)
5174 tree type
= gnat_to_gnu_type (Entity (choice
));
5176 low
= TYPE_MIN_VALUE (type
);
5177 high
= TYPE_MAX_VALUE (type
);
5180 = build_binary_op (TRUTH_ANDIF_EXPR
, integer_type_node
,
5181 build_binary_op (GE_EXPR
, integer_type_node
,
5183 build_binary_op (LE_EXPR
, integer_type_node
,
5187 /* ... fall through ... */
5188 case N_Character_Literal
:
5189 case N_Integer_Literal
:
5190 single
= gnat_to_gnu (choice
);
5191 this_test
= build_binary_op (EQ_EXPR
, integer_type_node
, operand
,
5195 case N_Others_Choice
:
5196 this_test
= integer_one_node
;
5203 result
= build_binary_op (TRUTH_ORIF_EXPR
, integer_type_node
,
5210 /* Return a GCC tree for a field corresponding to GNAT_FIELD to be
5211 placed in GNU_RECORD_TYPE.
5213 PACKED is 1 if the enclosing record is packed and -1 if the enclosing
5214 record has a Component_Alignment of Storage_Unit.
5216 DEFINITION is true if this field is for a record being defined. */
5219 gnat_to_gnu_field (Entity_Id gnat_field
, tree gnu_record_type
, int packed
,
5222 tree gnu_field_id
= get_entity_name (gnat_field
);
5223 tree gnu_field_type
= gnat_to_gnu_type (Etype (gnat_field
));
5227 bool needs_strict_alignment
5228 = (Is_Aliased (gnat_field
) || Strict_Alignment (Etype (gnat_field
))
5229 || Treat_As_Volatile (gnat_field
));
5231 /* If this field requires strict alignment or contains an item of
5232 variable sized, pretend it isn't packed. */
5233 if (needs_strict_alignment
|| is_variable_size (gnu_field_type
))
5236 /* For packed records, this is one of the few occasions on which we use
5237 the official RM size for discrete or fixed-point components, instead
5238 of the normal GNAT size stored in Esize. See description in Einfo:
5239 "Handling of Type'Size Values" for further details. */
5242 gnu_size
= validate_size (RM_Size (Etype (gnat_field
)), gnu_field_type
,
5243 gnat_field
, FIELD_DECL
, false, true);
5245 if (Known_Static_Esize (gnat_field
))
5246 gnu_size
= validate_size (Esize (gnat_field
), gnu_field_type
,
5247 gnat_field
, FIELD_DECL
, false, true);
5249 /* If we have a specified size that's smaller than that of the field type,
5250 or a position is specified, and the field type is also a record that's
5251 BLKmode and with a small constant size, see if we can get an integral
5252 mode form of the type when appropriate. If we can, show a size was
5253 specified for the field if there wasn't one already, so we know to make
5254 this a bitfield and avoid making things wider.
5256 Doing this is first useful if the record is packed because we can then
5257 place the field at a non-byte-aligned position and so achieve tighter
5260 This is in addition *required* if the field shares a byte with another
5261 field and the front-end lets the back-end handle the references, because
5262 GCC does not handle BLKmode bitfields properly.
5264 We avoid the transformation if it is not required or potentially useful,
5265 as it might entail an increase of the field's alignment and have ripple
5266 effects on the outer record type. A typical case is a field known to be
5267 byte aligned and not to share a byte with another field.
5269 Besides, we don't even look the possibility of a transformation in cases
5270 known to be in error already, for instance when an invalid size results
5271 from a component clause. */
5273 if (TREE_CODE (gnu_field_type
) == RECORD_TYPE
5274 && TYPE_MODE (gnu_field_type
) == BLKmode
5275 && host_integerp (TYPE_SIZE (gnu_field_type
), 1)
5276 && compare_tree_int (TYPE_SIZE (gnu_field_type
), BIGGEST_ALIGNMENT
) <= 0
5279 && tree_int_cst_lt (gnu_size
, TYPE_SIZE (gnu_field_type
)))
5280 || (Present (Component_Clause (gnat_field
)) && gnu_size
!= 0)))
5282 /* See what the alternate type and size would be. */
5283 tree gnu_packable_type
= make_packable_type (gnu_field_type
);
5285 bool has_byte_aligned_clause
5286 = Present (Component_Clause (gnat_field
))
5287 && (UI_To_Int (Component_Bit_Offset (gnat_field
))
5288 % BITS_PER_UNIT
== 0);
5290 /* Compute whether we should avoid the substitution. */
5292 /* There is no point substituting if there is no change. */
5293 (gnu_packable_type
== gnu_field_type
5295 /* ... nor when the field is known to be byte aligned and not to
5296 share a byte with another field. */
5297 (has_byte_aligned_clause
5298 && value_factor_p (gnu_size
, BITS_PER_UNIT
))
5300 /* The size of an aliased field must be an exact multiple of the
5301 type's alignment, which the substitution might increase. Reject
5302 substitutions that would so invalidate a component clause when the
5303 specified position is byte aligned, as the change would have no
5304 real benefit from the packing standpoint anyway. */
5305 (Is_Aliased (gnat_field
)
5306 && has_byte_aligned_clause
5307 && ! value_factor_p (gnu_size
, TYPE_ALIGN (gnu_packable_type
)))
5310 /* Substitute unless told otherwise. */
5313 gnu_field_type
= gnu_packable_type
;
5316 gnu_size
= rm_size (gnu_field_type
);
5320 /* If we are packing the record and the field is BLKmode, round the
5321 size up to a byte boundary. */
5322 if (packed
&& TYPE_MODE (gnu_field_type
) == BLKmode
&& gnu_size
)
5323 gnu_size
= round_up (gnu_size
, BITS_PER_UNIT
);
5325 if (Present (Component_Clause (gnat_field
)))
5327 gnu_pos
= UI_To_gnu (Component_Bit_Offset (gnat_field
), bitsizetype
);
5328 gnu_size
= validate_size (Esize (gnat_field
), gnu_field_type
,
5329 gnat_field
, FIELD_DECL
, false, true);
5331 /* Ensure the position does not overlap with the parent subtype,
5333 if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field
)))))
5336 = gnat_to_gnu_type (Parent_Subtype
5337 (Underlying_Type (Scope (gnat_field
))));
5339 if (TREE_CODE (TYPE_SIZE (gnu_parent
)) == INTEGER_CST
5340 && tree_int_cst_lt (gnu_pos
, TYPE_SIZE (gnu_parent
)))
5343 ("offset of& must be beyond parent{, minimum allowed is ^}",
5344 First_Bit (Component_Clause (gnat_field
)), gnat_field
,
5345 TYPE_SIZE_UNIT (gnu_parent
));
5349 /* If this field needs strict alignment, ensure the record is
5350 sufficiently aligned and that that position and size are
5351 consistent with the alignment. */
5352 if (needs_strict_alignment
)
5354 tree gnu_rounded_size
= round_up (rm_size (gnu_field_type
),
5355 TYPE_ALIGN (gnu_field_type
));
5357 TYPE_ALIGN (gnu_record_type
)
5358 = MAX (TYPE_ALIGN (gnu_record_type
), TYPE_ALIGN (gnu_field_type
));
5360 /* If Atomic, the size must match exactly that of the field. */
5361 if ((Is_Atomic (gnat_field
) || Is_Atomic (Etype (gnat_field
)))
5362 && !operand_equal_p (gnu_size
, TYPE_SIZE (gnu_field_type
), 0))
5365 ("atomic field& must be natural size of type{ (^)}",
5366 Last_Bit (Component_Clause (gnat_field
)), gnat_field
,
5367 TYPE_SIZE (gnu_field_type
));
5369 gnu_size
= NULL_TREE
;
5372 /* If Aliased, the size must match exactly the rounded size. We
5373 used to be more accommodating here and accept greater sizes, but
5374 fully supporting this case on big-endian platforms would require
5375 switching to a more involved layout for the field. */
5376 else if (Is_Aliased (gnat_field
)
5378 && ! operand_equal_p (gnu_size
, gnu_rounded_size
, 0))
5381 ("size of aliased field& must be ^ bits",
5382 Last_Bit (Component_Clause (gnat_field
)), gnat_field
,
5384 gnu_size
= NULL_TREE
;
5387 if (!integer_zerop (size_binop
5388 (TRUNC_MOD_EXPR
, gnu_pos
,
5389 bitsize_int (TYPE_ALIGN (gnu_field_type
)))))
5391 if (Is_Aliased (gnat_field
))
5393 ("position of aliased field& must be multiple of ^ bits",
5394 First_Bit (Component_Clause (gnat_field
)), gnat_field
,
5395 TYPE_ALIGN (gnu_field_type
));
5397 else if (Treat_As_Volatile (gnat_field
))
5399 ("position of volatile field& must be multiple of ^ bits",
5400 First_Bit (Component_Clause (gnat_field
)), gnat_field
,
5401 TYPE_ALIGN (gnu_field_type
));
5403 else if (Strict_Alignment (Etype (gnat_field
)))
5405 ("position of & with aliased or tagged components not multiple of ^ bits",
5406 First_Bit (Component_Clause (gnat_field
)), gnat_field
,
5407 TYPE_ALIGN (gnu_field_type
));
5411 gnu_pos
= NULL_TREE
;
5415 if (Is_Atomic (gnat_field
))
5416 check_ok_for_atomic (gnu_field_type
, gnat_field
, false);
5419 /* If the record has rep clauses and this is the tag field, make a rep
5420 clause for it as well. */
5421 else if (Has_Specified_Layout (Scope (gnat_field
))
5422 && Chars (gnat_field
) == Name_uTag
)
5424 gnu_pos
= bitsize_zero_node
;
5425 gnu_size
= TYPE_SIZE (gnu_field_type
);
5428 /* We need to make the size the maximum for the type if it is
5429 self-referential and an unconstrained type. In that case, we can't
5430 pack the field since we can't make a copy to align it. */
5431 if (TREE_CODE (gnu_field_type
) == RECORD_TYPE
5433 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type
))
5434 && !Is_Constrained (Underlying_Type (Etype (gnat_field
))))
5436 gnu_size
= max_size (TYPE_SIZE (gnu_field_type
), true);
5440 /* If no size is specified (or if there was an error), don't specify a
5443 gnu_pos
= NULL_TREE
;
5446 /* If the field's type is justified modular, we would need to remove
5447 the wrapper to (better) meet the layout requirements. However we
5448 can do so only if the field is not aliased to preserve the unique
5449 layout and if the prescribed size is not greater than that of the
5450 packed array to preserve the justification. */
5451 if (!needs_strict_alignment
5452 && TREE_CODE (gnu_field_type
) == RECORD_TYPE
5453 && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type
)
5454 && tree_int_cst_compare (gnu_size
, TYPE_ADA_SIZE (gnu_field_type
))
5456 gnu_field_type
= TREE_TYPE (TYPE_FIELDS (gnu_field_type
));
5459 = make_type_from_size (gnu_field_type
, gnu_size
,
5460 Has_Biased_Representation (gnat_field
));
5461 gnu_field_type
= maybe_pad_type (gnu_field_type
, gnu_size
, 0, gnat_field
,
5462 "PAD", false, definition
, true);
5465 gcc_assert (TREE_CODE (gnu_field_type
) != RECORD_TYPE
5466 || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type
));
5468 /* Now create the decl for the field. */
5469 gnu_field
= create_field_decl (gnu_field_id
, gnu_field_type
, gnu_record_type
,
5470 packed
, gnu_size
, gnu_pos
,
5471 Is_Aliased (gnat_field
));
5472 Sloc_to_locus (Sloc (gnat_field
), &DECL_SOURCE_LOCATION (gnu_field
));
5473 TREE_THIS_VOLATILE (gnu_field
) = Treat_As_Volatile (gnat_field
);
5475 if (Ekind (gnat_field
) == E_Discriminant
)
5476 DECL_DISCRIMINANT_NUMBER (gnu_field
)
5477 = UI_To_gnu (Discriminant_Number (gnat_field
), sizetype
);
5482 /* Return true if TYPE is a type with variable size, a padding type with a
5483 field of variable size or is a record that has a field such a field. */
5486 is_variable_size (tree type
)
5490 /* We need not be concerned about this at all if we don't have
5491 strict alignment. */
5492 if (!STRICT_ALIGNMENT
)
5494 else if (!TREE_CONSTANT (TYPE_SIZE (type
)))
5496 else if (TREE_CODE (type
) == RECORD_TYPE
&& TYPE_IS_PADDING_P (type
)
5497 && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type
))))
5499 else if (TREE_CODE (type
) != RECORD_TYPE
5500 && TREE_CODE (type
) != UNION_TYPE
5501 && TREE_CODE (type
) != QUAL_UNION_TYPE
)
5504 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
5505 if (is_variable_size (TREE_TYPE (field
)))
5511 /* Return a GCC tree for a record type given a GNAT Component_List and a chain
5512 of GCC trees for fields that are in the record and have already been
5513 processed. When called from gnat_to_gnu_entity during the processing of a
5514 record type definition, the GCC nodes for the discriminants will be on
5515 the chain. The other calls to this function are recursive calls from
5516 itself for the Component_List of a variant and the chain is empty.
5518 PACKED is 1 if this is for a record with "pragma pack" and -1 is this is
5519 for a record type with "pragma component_alignment (storage_unit)".
5521 DEFINITION is true if we are defining this record.
5523 P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
5524 with a rep clause is to be added. If it is nonzero, that is all that
5525 should be done with such fields.
5527 CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
5528 laying out the record. This means the alignment only serves to force fields
5529 to be bitfields, but not require the record to be that aligned. This is
5532 ALL_REP, if true, means a rep clause was found for all the fields. This
5533 simplifies the logic since we know we're not in the mixed case.
5535 DEFER_DEBUG, if true, means that the debugging routines should not be
5536 called when finishing constructing the record type.
5538 UNCHECKED_UNION, if tree, means that we are building a type for a record
5539 with a Pragma Unchecked_Union.
5541 The processing of the component list fills in the chain with all of the
5542 fields of the record and then the record type is finished. */
5545 components_to_record (tree gnu_record_type
, Node_Id component_list
,
5546 tree gnu_field_list
, int packed
, bool definition
,
5547 tree
*p_gnu_rep_list
, bool cancel_alignment
,
5548 bool all_rep
, bool defer_debug
, bool unchecked_union
)
5550 Node_Id component_decl
;
5551 Entity_Id gnat_field
;
5552 Node_Id variant_part
;
5553 tree gnu_our_rep_list
= NULL_TREE
;
5554 tree gnu_field
, gnu_last
;
5555 bool layout_with_rep
= false;
5556 bool all_rep_and_size
= all_rep
&& TYPE_SIZE (gnu_record_type
);
5558 /* For each variable within each component declaration create a GCC field
5559 and add it to the list, skipping any pragmas in the list. */
5561 if (Present (Component_Items (component_list
)))
5562 for (component_decl
= First_Non_Pragma (Component_Items (component_list
));
5563 Present (component_decl
);
5564 component_decl
= Next_Non_Pragma (component_decl
))
5566 gnat_field
= Defining_Entity (component_decl
);
5568 if (Chars (gnat_field
) == Name_uParent
)
5569 gnu_field
= tree_last (TYPE_FIELDS (gnu_record_type
));
5572 gnu_field
= gnat_to_gnu_field (gnat_field
, gnu_record_type
,
5573 packed
, definition
);
5575 /* If this is the _Tag field, put it before any discriminants,
5576 instead of after them as is the case for all other fields.
5577 Ignore field of void type if only annotating. */
5578 if (Chars (gnat_field
) == Name_uTag
)
5579 gnu_field_list
= chainon (gnu_field_list
, gnu_field
);
5582 TREE_CHAIN (gnu_field
) = gnu_field_list
;
5583 gnu_field_list
= gnu_field
;
5587 save_gnu_tree (gnat_field
, gnu_field
, false);
5590 /* At the end of the component list there may be a variant part. */
5591 variant_part
= Variant_Part (component_list
);
5593 /* We create a QUAL_UNION_TYPE for the variant part since the variants are
5594 mutually exclusive and should go in the same memory. To do this we need
5595 to treat each variant as a record whose elements are created from the
5596 component list for the variant. So here we create the records from the
5597 lists for the variants and put them all into the QUAL_UNION_TYPE.
5598 If this is an Unchecked_Union, we make a UNION_TYPE instead or
5599 use GNU_RECORD_TYPE if there are no fields so far. */
5600 if (Present (variant_part
))
5602 tree gnu_discriminant
= gnat_to_gnu (Name (variant_part
));
5604 tree gnu_name
= TYPE_NAME (gnu_record_type
);
5606 = concat_id_with_name (get_identifier (Get_Name_String
5607 (Chars (Name (variant_part
)))),
5609 tree gnu_union_type
;
5610 tree gnu_union_name
;
5611 tree gnu_union_field
;
5612 tree gnu_variant_list
= NULL_TREE
;
5614 if (TREE_CODE (gnu_name
) == TYPE_DECL
)
5615 gnu_name
= DECL_NAME (gnu_name
);
5617 gnu_union_name
= concat_id_with_name (gnu_name
,
5618 IDENTIFIER_POINTER (gnu_var_name
));
5620 if (!gnu_field_list
&& TREE_CODE (gnu_record_type
) == UNION_TYPE
)
5621 gnu_union_type
= gnu_record_type
;
5626 = make_node (unchecked_union
? UNION_TYPE
: QUAL_UNION_TYPE
);
5628 TYPE_NAME (gnu_union_type
) = gnu_union_name
;
5629 TYPE_PACKED (gnu_union_type
) = TYPE_PACKED (gnu_record_type
);
5632 for (variant
= First_Non_Pragma (Variants (variant_part
));
5634 variant
= Next_Non_Pragma (variant
))
5636 tree gnu_variant_type
= make_node (RECORD_TYPE
);
5637 tree gnu_inner_name
;
5640 Get_Variant_Encoding (variant
);
5641 gnu_inner_name
= get_identifier (Name_Buffer
);
5642 TYPE_NAME (gnu_variant_type
)
5643 = concat_id_with_name (gnu_union_name
,
5644 IDENTIFIER_POINTER (gnu_inner_name
));
5646 /* Set the alignment of the inner type in case we need to make
5647 inner objects into bitfields, but then clear it out
5648 so the record actually gets only the alignment required. */
5649 TYPE_ALIGN (gnu_variant_type
) = TYPE_ALIGN (gnu_record_type
);
5650 TYPE_PACKED (gnu_variant_type
) = TYPE_PACKED (gnu_record_type
);
5652 /* Similarly, if the outer record has a size specified and all fields
5653 have record rep clauses, we can propagate the size into the
5655 if (all_rep_and_size
)
5657 TYPE_SIZE (gnu_variant_type
) = TYPE_SIZE (gnu_record_type
);
5658 TYPE_SIZE_UNIT (gnu_variant_type
)
5659 = TYPE_SIZE_UNIT (gnu_record_type
);
5662 components_to_record (gnu_variant_type
, Component_List (variant
),
5663 NULL_TREE
, packed
, definition
,
5664 &gnu_our_rep_list
, !all_rep_and_size
, all_rep
,
5665 false, unchecked_union
);
5667 gnu_qual
= choices_to_gnu (gnu_discriminant
,
5668 Discrete_Choices (variant
));
5670 Set_Present_Expr (variant
, annotate_value (gnu_qual
));
5672 /* If this is an Unchecked_Union and we have exactly one field,
5673 use that field here. */
5674 if (unchecked_union
&& TYPE_FIELDS (gnu_variant_type
)
5675 && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type
)))
5676 gnu_field
= TYPE_FIELDS (gnu_variant_type
);
5679 gnu_field
= create_field_decl (gnu_inner_name
, gnu_variant_type
,
5682 ? TYPE_SIZE (gnu_record_type
)
5685 ? bitsize_zero_node
: 0),
5688 DECL_INTERNAL_P (gnu_field
) = 1;
5690 if (!unchecked_union
)
5691 DECL_QUALIFIER (gnu_field
) = gnu_qual
;
5694 TREE_CHAIN (gnu_field
) = gnu_variant_list
;
5695 gnu_variant_list
= gnu_field
;
5698 /* We used to delete the empty variants from the end. However,
5699 we no longer do that because we need them to generate complete
5700 debugging information for the variant record. Otherwise,
5701 the union type definition will be missing the fields associated
5702 to these empty variants. */
5704 /* Only make the QUAL_UNION_TYPE if there are any non-empty variants. */
5705 if (gnu_variant_list
)
5707 if (all_rep_and_size
)
5709 TYPE_SIZE (gnu_union_type
) = TYPE_SIZE (gnu_record_type
);
5710 TYPE_SIZE_UNIT (gnu_union_type
)
5711 = TYPE_SIZE_UNIT (gnu_record_type
);
5714 finish_record_type (gnu_union_type
, nreverse (gnu_variant_list
),
5715 all_rep_and_size
, false);
5717 /* If GNU_UNION_TYPE is our record type, it means we must have an
5718 Unchecked_Union with no fields. Verify that and, if so, just
5720 if (gnu_union_type
== gnu_record_type
)
5722 gcc_assert (!gnu_field_list
&& unchecked_union
);
5727 = create_field_decl (gnu_var_name
, gnu_union_type
, gnu_record_type
,
5729 all_rep
? TYPE_SIZE (gnu_union_type
) : 0,
5730 all_rep
? bitsize_zero_node
: 0, 0);
5732 DECL_INTERNAL_P (gnu_union_field
) = 1;
5733 TREE_CHAIN (gnu_union_field
) = gnu_field_list
;
5734 gnu_field_list
= gnu_union_field
;
5738 /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they
5739 do, pull them out and put them into GNU_OUR_REP_LIST. We have to do this
5740 in a separate pass since we want to handle the discriminants but can't
5741 play with them until we've used them in debugging data above.
5743 ??? Note: if we then reorder them, debugging information will be wrong,
5744 but there's nothing that can be done about this at the moment. */
5746 for (gnu_field
= gnu_field_list
, gnu_last
= NULL_TREE
; gnu_field
; )
5748 if (DECL_FIELD_OFFSET (gnu_field
))
5750 tree gnu_next
= TREE_CHAIN (gnu_field
);
5753 gnu_field_list
= gnu_next
;
5755 TREE_CHAIN (gnu_last
) = gnu_next
;
5757 TREE_CHAIN (gnu_field
) = gnu_our_rep_list
;
5758 gnu_our_rep_list
= gnu_field
;
5759 gnu_field
= gnu_next
;
5763 gnu_last
= gnu_field
;
5764 gnu_field
= TREE_CHAIN (gnu_field
);
5768 /* If we have any items in our rep'ed field list, it is not the case that all
5769 the fields in the record have rep clauses, and P_REP_LIST is nonzero,
5770 set it and ignore the items. */
5771 if (gnu_our_rep_list
&& p_gnu_rep_list
&& !all_rep
)
5772 *p_gnu_rep_list
= chainon (*p_gnu_rep_list
, gnu_our_rep_list
);
5773 else if (gnu_our_rep_list
)
5775 /* Otherwise, sort the fields by bit position and put them into their
5776 own record if we have any fields without rep clauses. */
5778 = (gnu_field_list
? make_node (RECORD_TYPE
) : gnu_record_type
);
5779 int len
= list_length (gnu_our_rep_list
);
5780 tree
*gnu_arr
= (tree
*) alloca (sizeof (tree
) * len
);
5783 for (i
= 0, gnu_field
= gnu_our_rep_list
; gnu_field
;
5784 gnu_field
= TREE_CHAIN (gnu_field
), i
++)
5785 gnu_arr
[i
] = gnu_field
;
5787 qsort (gnu_arr
, len
, sizeof (tree
), compare_field_bitpos
);
5789 /* Put the fields in the list in order of increasing position, which
5790 means we start from the end. */
5791 gnu_our_rep_list
= NULL_TREE
;
5792 for (i
= len
- 1; i
>= 0; i
--)
5794 TREE_CHAIN (gnu_arr
[i
]) = gnu_our_rep_list
;
5795 gnu_our_rep_list
= gnu_arr
[i
];
5796 DECL_CONTEXT (gnu_arr
[i
]) = gnu_rep_type
;
5801 finish_record_type (gnu_rep_type
, gnu_our_rep_list
, true, false);
5802 gnu_field
= create_field_decl (get_identifier ("REP"), gnu_rep_type
,
5803 gnu_record_type
, 0, 0, 0, 1);
5804 DECL_INTERNAL_P (gnu_field
) = 1;
5805 gnu_field_list
= chainon (gnu_field_list
, gnu_field
);
5809 layout_with_rep
= true;
5810 gnu_field_list
= nreverse (gnu_our_rep_list
);
5814 if (cancel_alignment
)
5815 TYPE_ALIGN (gnu_record_type
) = 0;
5817 finish_record_type (gnu_record_type
, nreverse (gnu_field_list
),
5818 layout_with_rep
, defer_debug
);
5821 /* Called via qsort from the above. Returns -1, 1, depending on the
5822 bit positions and ordinals of the two fields. Use DECL_UID to ensure
5826 compare_field_bitpos (const PTR rt1
, const PTR rt2
)
5828 tree
*t1
= (tree
*) rt1
;
5829 tree
*t2
= (tree
*) rt2
;
5831 if (tree_int_cst_equal (bit_position (*t1
), bit_position (*t2
)))
5832 return DECL_UID (*t1
) < DECL_UID (*t2
) ? -1 : 1;
5833 else if (tree_int_cst_lt (bit_position (*t1
), bit_position (*t2
)))
5839 /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
5840 placed into an Esize, Component_Bit_Offset, or Component_Size value
5841 in the GNAT tree. */
5844 annotate_value (tree gnu_size
)
5846 int len
= TREE_CODE_LENGTH (TREE_CODE (gnu_size
));
5848 Node_Ref_Or_Val ops
[3], ret
;
5852 /* See if we've already saved the value for this node. */
5853 if (EXPR_P (gnu_size
) && TREE_COMPLEXITY (gnu_size
))
5854 return (Node_Ref_Or_Val
) TREE_COMPLEXITY (gnu_size
);
5856 /* If we do not return inside this switch, TCODE will be set to the
5857 code to use for a Create_Node operand and LEN (set above) will be
5858 the number of recursive calls for us to make. */
5860 switch (TREE_CODE (gnu_size
))
5863 if (TREE_OVERFLOW (gnu_size
))
5866 /* This may have come from a conversion from some smaller type,
5867 so ensure this is in bitsizetype. */
5868 gnu_size
= convert (bitsizetype
, gnu_size
);
5870 /* For negative values, use NEGATE_EXPR of the supplied value. */
5871 if (tree_int_cst_sgn (gnu_size
) < 0)
5873 /* The ridiculous code below is to handle the case of the largest
5874 negative integer. */
5875 tree negative_size
= size_diffop (bitsize_zero_node
, gnu_size
);
5876 bool adjust
= false;
5879 if (TREE_CONSTANT_OVERFLOW (negative_size
))
5882 = size_binop (MINUS_EXPR
, bitsize_zero_node
,
5883 size_binop (PLUS_EXPR
, gnu_size
,
5888 temp
= build1 (NEGATE_EXPR
, bitsizetype
, negative_size
);
5890 temp
= build2 (MINUS_EXPR
, bitsizetype
, temp
, bitsize_one_node
);
5892 return annotate_value (temp
);
5895 if (!host_integerp (gnu_size
, 1))
5898 size
= tree_low_cst (gnu_size
, 1);
5900 /* This peculiar test is to make sure that the size fits in an int
5901 on machines where HOST_WIDE_INT is not "int". */
5902 if (tree_low_cst (gnu_size
, 1) == size
)
5903 return UI_From_Int (size
);
5908 /* The only case we handle here is a simple discriminant reference. */
5909 if (TREE_CODE (TREE_OPERAND (gnu_size
, 0)) == PLACEHOLDER_EXPR
5910 && TREE_CODE (TREE_OPERAND (gnu_size
, 1)) == FIELD_DECL
5911 && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size
, 1)))
5912 return Create_Node (Discrim_Val
,
5913 annotate_value (DECL_DISCRIMINANT_NUMBER
5914 (TREE_OPERAND (gnu_size
, 1))),
5919 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
5920 return annotate_value (TREE_OPERAND (gnu_size
, 0));
5922 /* Now just list the operations we handle. */
5923 case COND_EXPR
: tcode
= Cond_Expr
; break;
5924 case PLUS_EXPR
: tcode
= Plus_Expr
; break;
5925 case MINUS_EXPR
: tcode
= Minus_Expr
; break;
5926 case MULT_EXPR
: tcode
= Mult_Expr
; break;
5927 case TRUNC_DIV_EXPR
: tcode
= Trunc_Div_Expr
; break;
5928 case CEIL_DIV_EXPR
: tcode
= Ceil_Div_Expr
; break;
5929 case FLOOR_DIV_EXPR
: tcode
= Floor_Div_Expr
; break;
5930 case TRUNC_MOD_EXPR
: tcode
= Trunc_Mod_Expr
; break;
5931 case CEIL_MOD_EXPR
: tcode
= Ceil_Mod_Expr
; break;
5932 case FLOOR_MOD_EXPR
: tcode
= Floor_Mod_Expr
; break;
5933 case EXACT_DIV_EXPR
: tcode
= Exact_Div_Expr
; break;
5934 case NEGATE_EXPR
: tcode
= Negate_Expr
; break;
5935 case MIN_EXPR
: tcode
= Min_Expr
; break;
5936 case MAX_EXPR
: tcode
= Max_Expr
; break;
5937 case ABS_EXPR
: tcode
= Abs_Expr
; break;
5938 case TRUTH_ANDIF_EXPR
: tcode
= Truth_Andif_Expr
; break;
5939 case TRUTH_ORIF_EXPR
: tcode
= Truth_Orif_Expr
; break;
5940 case TRUTH_AND_EXPR
: tcode
= Truth_And_Expr
; break;
5941 case TRUTH_OR_EXPR
: tcode
= Truth_Or_Expr
; break;
5942 case TRUTH_XOR_EXPR
: tcode
= Truth_Xor_Expr
; break;
5943 case TRUTH_NOT_EXPR
: tcode
= Truth_Not_Expr
; break;
5944 case BIT_AND_EXPR
: tcode
= Bit_And_Expr
; break;
5945 case LT_EXPR
: tcode
= Lt_Expr
; break;
5946 case LE_EXPR
: tcode
= Le_Expr
; break;
5947 case GT_EXPR
: tcode
= Gt_Expr
; break;
5948 case GE_EXPR
: tcode
= Ge_Expr
; break;
5949 case EQ_EXPR
: tcode
= Eq_Expr
; break;
5950 case NE_EXPR
: tcode
= Ne_Expr
; break;
5956 /* Now get each of the operands that's relevant for this code. If any
5957 cannot be expressed as a repinfo node, say we can't. */
5958 for (i
= 0; i
< 3; i
++)
5961 for (i
= 0; i
< len
; i
++)
5963 ops
[i
] = annotate_value (TREE_OPERAND (gnu_size
, i
));
5964 if (ops
[i
] == No_Uint
)
5968 ret
= Create_Node (tcode
, ops
[0], ops
[1], ops
[2]);
5969 TREE_COMPLEXITY (gnu_size
) = ret
;
5973 /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding
5974 GCC type, set Component_Bit_Offset and Esize to the position and size
5978 annotate_rep (Entity_Id gnat_entity
, tree gnu_type
)
5982 Entity_Id gnat_field
;
5984 /* We operate by first making a list of all fields and their positions
5985 (we can get the sizes easily at any time) by a recursive call
5986 and then update all the sizes into the tree. */
5987 gnu_list
= compute_field_positions (gnu_type
, NULL_TREE
,
5988 size_zero_node
, bitsize_zero_node
,
5991 for (gnat_field
= First_Entity (gnat_entity
); Present (gnat_field
);
5992 gnat_field
= Next_Entity (gnat_field
))
5993 if ((Ekind (gnat_field
) == E_Component
5994 || (Ekind (gnat_field
) == E_Discriminant
5995 && !Is_Unchecked_Union (Scope (gnat_field
)))))
5997 tree parent_offset
= bitsize_zero_node
;
5999 gnu_entry
= purpose_member (gnat_to_gnu_field_decl (gnat_field
),
6004 if (type_annotate_only
&& Is_Tagged_Type (gnat_entity
))
6006 /* In this mode the tag and parent components have not been
6007 generated, so we add the appropriate offset to each
6008 component. For a component appearing in the current
6009 extension, the offset is the size of the parent. */
6010 if (Is_Derived_Type (gnat_entity
)
6011 && Original_Record_Component (gnat_field
) == gnat_field
)
6013 = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity
))),
6016 parent_offset
= bitsize_int (POINTER_SIZE
);
6019 Set_Component_Bit_Offset
6022 (size_binop (PLUS_EXPR
,
6023 bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry
)),
6024 TREE_VALUE (TREE_VALUE
6025 (TREE_VALUE (gnu_entry
)))),
6028 Set_Esize (gnat_field
,
6029 annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry
))));
6031 else if (Is_Tagged_Type (gnat_entity
)
6032 && Is_Derived_Type (gnat_entity
))
6034 /* If there is no gnu_entry, this is an inherited component whose
6035 position is the same as in the parent type. */
6036 Set_Component_Bit_Offset
6038 Component_Bit_Offset (Original_Record_Component (gnat_field
)));
6039 Set_Esize (gnat_field
,
6040 Esize (Original_Record_Component (gnat_field
)));
6045 /* Scan all fields in GNU_TYPE and build entries where TREE_PURPOSE is the
6046 FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte
6047 position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be
6048 placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is
6049 to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is
6050 the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries
6054 compute_field_positions (tree gnu_type
, tree gnu_list
, tree gnu_pos
,
6055 tree gnu_bitpos
, unsigned int offset_align
)
6058 tree gnu_result
= gnu_list
;
6060 for (gnu_field
= TYPE_FIELDS (gnu_type
); gnu_field
;
6061 gnu_field
= TREE_CHAIN (gnu_field
))
6063 tree gnu_our_bitpos
= size_binop (PLUS_EXPR
, gnu_bitpos
,
6064 DECL_FIELD_BIT_OFFSET (gnu_field
));
6065 tree gnu_our_offset
= size_binop (PLUS_EXPR
, gnu_pos
,
6066 DECL_FIELD_OFFSET (gnu_field
));
6067 unsigned int our_offset_align
6068 = MIN (offset_align
, DECL_OFFSET_ALIGN (gnu_field
));
6071 = tree_cons (gnu_field
,
6072 tree_cons (gnu_our_offset
,
6073 tree_cons (size_int (our_offset_align
),
6074 gnu_our_bitpos
, NULL_TREE
),
6078 if (DECL_INTERNAL_P (gnu_field
))
6080 = compute_field_positions (TREE_TYPE (gnu_field
), gnu_result
,
6081 gnu_our_offset
, gnu_our_bitpos
,
6088 /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE
6089 corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding
6090 to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying
6091 the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL
6092 for the size of a field. COMPONENT_P is true if we are being called
6093 to process the Component_Size of GNAT_OBJECT. This is used for error
6094 message handling and to indicate to use the object size of GNU_TYPE.
6095 ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false,
6096 it means that a size of zero should be treated as an unspecified size. */
6099 validate_size (Uint uint_size
, tree gnu_type
, Entity_Id gnat_object
,
6100 enum tree_code kind
, bool component_p
, bool zero_ok
)
6102 Node_Id gnat_error_node
;
6104 = kind
== VAR_DECL
? TYPE_SIZE (gnu_type
) : rm_size (gnu_type
);
6107 /* Find the node to use for errors. */
6108 if ((Ekind (gnat_object
) == E_Component
6109 || Ekind (gnat_object
) == E_Discriminant
)
6110 && Present (Component_Clause (gnat_object
)))
6111 gnat_error_node
= Last_Bit (Component_Clause (gnat_object
));
6112 else if (Present (Size_Clause (gnat_object
)))
6113 gnat_error_node
= Expression (Size_Clause (gnat_object
));
6115 gnat_error_node
= gnat_object
;
6117 /* Return 0 if no size was specified, either because Esize was not Present or
6118 the specified size was zero. */
6119 if (No (uint_size
) || uint_size
== No_Uint
)
6122 /* Get the size as a tree. Give an error if a size was specified, but cannot
6123 be represented as in sizetype. */
6124 size
= UI_To_gnu (uint_size
, bitsizetype
);
6125 if (TREE_OVERFLOW (size
))
6127 post_error_ne (component_p
? "component size of & is too large"
6128 : "size of & is too large",
6129 gnat_error_node
, gnat_object
);
6133 /* Ignore a negative size since that corresponds to our back-annotation.
6134 Also ignore a zero size unless a size clause exists. */
6135 else if (tree_int_cst_sgn (size
) < 0 || (integer_zerop (size
) && !zero_ok
))
6138 /* The size of objects is always a multiple of a byte. */
6139 if (kind
== VAR_DECL
6140 && !integer_zerop (size_binop (TRUNC_MOD_EXPR
, size
, bitsize_unit_node
)))
6143 post_error_ne ("component size for& is not a multiple of Storage_Unit",
6144 gnat_error_node
, gnat_object
);
6146 post_error_ne ("size for& is not a multiple of Storage_Unit",
6147 gnat_error_node
, gnat_object
);
6151 /* If this is an integral type or a packed array type, the front-end has
6152 verified the size, so we need not do it here (which would entail
6153 checking against the bounds). However, if this is an aliased object, it
6154 may not be smaller than the type of the object. */
6155 if ((INTEGRAL_TYPE_P (gnu_type
) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type
))
6156 && !(kind
== VAR_DECL
&& Is_Aliased (gnat_object
)))
6159 /* If the object is a record that contains a template, add the size of
6160 the template to the specified size. */
6161 if (TREE_CODE (gnu_type
) == RECORD_TYPE
6162 && TYPE_CONTAINS_TEMPLATE_P (gnu_type
))
6163 size
= size_binop (PLUS_EXPR
, DECL_SIZE (TYPE_FIELDS (gnu_type
)), size
);
6165 /* Modify the size of the type to be that of the maximum size if it has a
6166 discriminant or the size of a thin pointer if this is a fat pointer. */
6167 if (type_size
&& CONTAINS_PLACEHOLDER_P (type_size
))
6168 type_size
= max_size (type_size
, true);
6169 else if (TYPE_FAT_POINTER_P (gnu_type
))
6170 type_size
= bitsize_int (POINTER_SIZE
);
6172 /* If this is an access type, the minimum size is that given by the smallest
6173 integral mode that's valid for pointers. */
6174 if (TREE_CODE (gnu_type
) == POINTER_TYPE
)
6176 enum machine_mode p_mode
;
6178 for (p_mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
6179 !targetm
.valid_pointer_mode (p_mode
);
6180 p_mode
= GET_MODE_WIDER_MODE (p_mode
))
6183 type_size
= bitsize_int (GET_MODE_BITSIZE (p_mode
));
6186 /* If the size of the object is a constant, the new size must not be
6188 if (TREE_CODE (type_size
) != INTEGER_CST
6189 || TREE_OVERFLOW (type_size
)
6190 || tree_int_cst_lt (size
, type_size
))
6194 ("component size for& too small{, minimum allowed is ^}",
6195 gnat_error_node
, gnat_object
, type_size
);
6197 post_error_ne_tree ("size for& too small{, minimum allowed is ^}",
6198 gnat_error_node
, gnat_object
, type_size
);
6200 if (kind
== VAR_DECL
&& !component_p
6201 && TREE_CODE (rm_size (gnu_type
)) == INTEGER_CST
6202 && !tree_int_cst_lt (size
, rm_size (gnu_type
)))
6203 post_error_ne_tree_2
6204 ("\\size of ^ is not a multiple of alignment (^ bits)",
6205 gnat_error_node
, gnat_object
, rm_size (gnu_type
),
6206 TYPE_ALIGN (gnu_type
));
6208 else if (INTEGRAL_TYPE_P (gnu_type
))
6209 post_error_ne ("\\size would be legal if & were not aliased!",
6210 gnat_error_node
, gnat_object
);
6218 /* Similarly, but both validate and process a value of RM_Size. This
6219 routine is only called for types. */
6222 set_rm_size (Uint uint_size
, tree gnu_type
, Entity_Id gnat_entity
)
6224 /* Only give an error if a Value_Size clause was explicitly given.
6225 Otherwise, we'd be duplicating an error on the Size clause. */
6226 Node_Id gnat_attr_node
6227 = Get_Attribute_Definition_Clause (gnat_entity
, Attr_Value_Size
);
6228 tree old_size
= rm_size (gnu_type
);
6231 /* Get the size as a tree. Do nothing if none was specified, either
6232 because RM_Size was not Present or if the specified size was zero.
6233 Give an error if a size was specified, but cannot be represented as
6235 if (No (uint_size
) || uint_size
== No_Uint
)
6238 size
= UI_To_gnu (uint_size
, bitsizetype
);
6239 if (TREE_OVERFLOW (size
))
6241 if (Present (gnat_attr_node
))
6242 post_error_ne ("Value_Size of & is too large", gnat_attr_node
,
6248 /* Ignore a negative size since that corresponds to our back-annotation.
6249 Also ignore a zero size unless a size clause exists, a Value_Size
6250 clause exists, or this is an integer type, in which case the
6251 front end will have always set it. */
6252 else if (tree_int_cst_sgn (size
) < 0
6253 || (integer_zerop (size
) && No (gnat_attr_node
)
6254 && !Has_Size_Clause (gnat_entity
)
6255 && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity
)))
6258 /* If the old size is self-referential, get the maximum size. */
6259 if (CONTAINS_PLACEHOLDER_P (old_size
))
6260 old_size
= max_size (old_size
, true);
6262 /* If the size of the object is a constant, the new size must not be
6263 smaller (the front end checks this for scalar types). */
6264 if (TREE_CODE (old_size
) != INTEGER_CST
6265 || TREE_OVERFLOW (old_size
)
6266 || (AGGREGATE_TYPE_P (gnu_type
)
6267 && tree_int_cst_lt (size
, old_size
)))
6269 if (Present (gnat_attr_node
))
6271 ("Value_Size for& too small{, minimum allowed is ^}",
6272 gnat_attr_node
, gnat_entity
, old_size
);
6277 /* Otherwise, set the RM_Size. */
6278 if (TREE_CODE (gnu_type
) == INTEGER_TYPE
6279 && Is_Discrete_Or_Fixed_Point_Type (gnat_entity
))
6280 TYPE_RM_SIZE_NUM (gnu_type
) = size
;
6281 else if (TREE_CODE (gnu_type
) == ENUMERAL_TYPE
)
6282 TYPE_RM_SIZE_NUM (gnu_type
) = size
;
6283 else if ((TREE_CODE (gnu_type
) == RECORD_TYPE
6284 || TREE_CODE (gnu_type
) == UNION_TYPE
6285 || TREE_CODE (gnu_type
) == QUAL_UNION_TYPE
)
6286 && !TYPE_IS_FAT_POINTER_P (gnu_type
))
6287 SET_TYPE_ADA_SIZE (gnu_type
, size
);
6290 /* Given a type TYPE, return a new type whose size is appropriate for SIZE.
6291 If TYPE is the best type, return it. Otherwise, make a new type. We
6292 only support new integral and pointer types. BIASED_P is nonzero if
6293 we are making a biased type. */
6296 make_type_from_size (tree type
, tree size_tree
, bool biased_p
)
6299 unsigned HOST_WIDE_INT size
;
6302 /* If size indicates an error, just return TYPE to avoid propagating the
6303 error. Likewise if it's too large to represent. */
6304 if (!size_tree
|| !host_integerp (size_tree
, 1))
6307 size
= tree_low_cst (size_tree
, 1);
6308 switch (TREE_CODE (type
))
6312 /* Only do something if the type is not already the proper size and is
6313 not a packed array type. */
6314 if (TYPE_PACKED_ARRAY_TYPE_P (type
)
6315 || (TYPE_PRECISION (type
) == size
6316 && biased_p
== (TREE_CODE (type
) == INTEGER_CST
6317 && TYPE_BIASED_REPRESENTATION_P (type
))))
6320 biased_p
|= (TREE_CODE (type
) == INTEGER_TYPE
6321 && TYPE_BIASED_REPRESENTATION_P (type
));
6322 unsigned_p
= TYPE_UNSIGNED (type
) || biased_p
;
6324 size
= MIN (size
, LONG_LONG_TYPE_SIZE
);
6326 = unsigned_p
? make_unsigned_type (size
) : make_signed_type (size
);
6327 TREE_TYPE (new_type
) = TREE_TYPE (type
) ? TREE_TYPE (type
) : type
;
6328 TYPE_MIN_VALUE (new_type
)
6329 = convert (TREE_TYPE (new_type
), TYPE_MIN_VALUE (type
));
6330 TYPE_MAX_VALUE (new_type
)
6331 = convert (TREE_TYPE (new_type
), TYPE_MAX_VALUE (type
));
6332 TYPE_BIASED_REPRESENTATION_P (new_type
) = biased_p
;
6333 TYPE_RM_SIZE_NUM (new_type
) = bitsize_int (size
);
6337 /* Do something if this is a fat pointer, in which case we
6338 may need to return the thin pointer. */
6339 if (TYPE_IS_FAT_POINTER_P (type
) && size
< POINTER_SIZE
* 2)
6342 (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type
)));
6346 /* Only do something if this is a thin pointer, in which case we
6347 may need to return the fat pointer. */
6348 if (TYPE_THIN_POINTER_P (type
) && size
>= POINTER_SIZE
* 2)
6350 build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type
)));
6361 /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY,
6362 a type or object whose present alignment is ALIGN. If this alignment is
6363 valid, return it. Otherwise, give an error and return ALIGN. */
6366 validate_alignment (Uint alignment
, Entity_Id gnat_entity
, unsigned int align
)
6368 Node_Id gnat_error_node
= gnat_entity
;
6369 unsigned int new_align
;
6371 #ifndef MAX_OFILE_ALIGNMENT
6372 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
6375 if (Present (Alignment_Clause (gnat_entity
)))
6376 gnat_error_node
= Expression (Alignment_Clause (gnat_entity
));
6378 /* Don't worry about checking alignment if alignment was not specified
6379 by the source program and we already posted an error for this entity. */
6381 if (Error_Posted (gnat_entity
) && !Has_Alignment_Clause (gnat_entity
))
6384 /* Within GCC, an alignment is an integer, so we must make sure a
6385 value is specified that fits in that range. Also, alignments of
6386 more than MAX_OFILE_ALIGNMENT can't be supported. */
6388 if (! UI_Is_In_Int_Range (alignment
)
6389 || ((new_align
= UI_To_Int (alignment
))
6390 > MAX_OFILE_ALIGNMENT
/ BITS_PER_UNIT
))
6391 post_error_ne_num ("largest supported alignment for& is ^",
6392 gnat_error_node
, gnat_entity
,
6393 MAX_OFILE_ALIGNMENT
/ BITS_PER_UNIT
);
6394 else if (!(Present (Alignment_Clause (gnat_entity
))
6395 && From_At_Mod (Alignment_Clause (gnat_entity
)))
6396 && new_align
* BITS_PER_UNIT
< align
)
6397 post_error_ne_num ("alignment for& must be at least ^",
6398 gnat_error_node
, gnat_entity
,
6399 align
/ BITS_PER_UNIT
);
6401 align
= MAX (align
, new_align
== 0 ? 1 : new_align
* BITS_PER_UNIT
);
6406 /* Verify that OBJECT, a type or decl, is something we can implement
6407 atomically. If not, give an error for GNAT_ENTITY. COMP_P is true
6408 if we require atomic components. */
6411 check_ok_for_atomic (tree object
, Entity_Id gnat_entity
, bool comp_p
)
6413 Node_Id gnat_error_point
= gnat_entity
;
6415 enum machine_mode mode
;
6419 /* There are three case of what OBJECT can be. It can be a type, in which
6420 case we take the size, alignment and mode from the type. It can be a
6421 declaration that was indirect, in which case the relevant values are
6422 that of the type being pointed to, or it can be a normal declaration,
6423 in which case the values are of the decl. The code below assumes that
6424 OBJECT is either a type or a decl. */
6425 if (TYPE_P (object
))
6427 mode
= TYPE_MODE (object
);
6428 align
= TYPE_ALIGN (object
);
6429 size
= TYPE_SIZE (object
);
6431 else if (DECL_BY_REF_P (object
))
6433 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (object
)));
6434 align
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object
)));
6435 size
= TYPE_SIZE (TREE_TYPE (TREE_TYPE (object
)));
6439 mode
= DECL_MODE (object
);
6440 align
= DECL_ALIGN (object
);
6441 size
= DECL_SIZE (object
);
6444 /* Consider all floating-point types atomic and any types that that are
6445 represented by integers no wider than a machine word. */
6446 if (GET_MODE_CLASS (mode
) == MODE_FLOAT
6447 || ((GET_MODE_CLASS (mode
) == MODE_INT
6448 || GET_MODE_CLASS (mode
) == MODE_PARTIAL_INT
)
6449 && GET_MODE_BITSIZE (mode
) <= BITS_PER_WORD
))
6452 /* For the moment, also allow anything that has an alignment equal
6453 to its size and which is smaller than a word. */
6454 if (size
&& TREE_CODE (size
) == INTEGER_CST
6455 && compare_tree_int (size
, align
) == 0
6456 && align
<= BITS_PER_WORD
)
6459 for (gnat_node
= First_Rep_Item (gnat_entity
); Present (gnat_node
);
6460 gnat_node
= Next_Rep_Item (gnat_node
))
6462 if (!comp_p
&& Nkind (gnat_node
) == N_Pragma
6463 && Get_Pragma_Id (Chars (gnat_node
)) == Pragma_Atomic
)
6464 gnat_error_point
= First (Pragma_Argument_Associations (gnat_node
));
6465 else if (comp_p
&& Nkind (gnat_node
) == N_Pragma
6466 && (Get_Pragma_Id (Chars (gnat_node
))
6467 == Pragma_Atomic_Components
))
6468 gnat_error_point
= First (Pragma_Argument_Associations (gnat_node
));
6472 post_error_ne ("atomic access to component of & cannot be guaranteed",
6473 gnat_error_point
, gnat_entity
);
6475 post_error_ne ("atomic access to & cannot be guaranteed",
6476 gnat_error_point
, gnat_entity
);
6479 /* Check if FTYPE1 and FTYPE2, two potentially different function type nodes,
6480 have compatible signatures so that a call using one type may be safely
6481 issued if the actual target function type is the other. Return 1 if it is
6482 the case, 0 otherwise, and post errors on the incompatibilities.
6484 This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure
6485 that calls to the subprogram will have arguments suitable for the later
6486 underlying builtin expansion. */
6489 compatible_signatures_p (tree ftype1
, tree ftype2
)
6491 /* As of now, we only perform very trivial tests and consider it's the
6492 programmer's responsibility to ensure the type correctness in the Ada
6493 declaration, as in the regular Import cases.
6495 Mismatches typically result in either error messages from the builtin
6496 expander, internal compiler errors, or in a real call sequence. This
6497 should be refined to issue diagnostics helping error detection and
6500 /* Almost fake test, ensuring a use of each argument. */
6501 if (ftype1
== ftype2
)
6507 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a new type
6508 with all size expressions that contain F updated by replacing F with R.
6509 This is identical to GCC's substitute_in_type except that it knows about
6510 TYPE_INDEX_TYPE. If F is NULL_TREE, always make a new RECORD_TYPE, even if
6511 nothing has changed. */
6514 gnat_substitute_in_type (tree t
, tree f
, tree r
)
6519 switch (TREE_CODE (t
))
6524 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t
))
6525 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t
)))
6527 tree low
= SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t
), f
, r
);
6528 tree high
= SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t
), f
, r
);
6530 if (low
== TYPE_MIN_VALUE (t
) && high
== TYPE_MAX_VALUE (t
))
6533 new = build_range_type (TREE_TYPE (t
), low
, high
);
6534 if (TYPE_INDEX_TYPE (t
))
6536 (new, gnat_substitute_in_type (TYPE_INDEX_TYPE (t
), f
, r
));
6543 if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t
))
6544 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t
)))
6546 tree low
= NULL_TREE
, high
= NULL_TREE
;
6548 if (TYPE_MIN_VALUE (t
))
6549 low
= SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t
), f
, r
);
6550 if (TYPE_MAX_VALUE (t
))
6551 high
= SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t
), f
, r
);
6553 if (low
== TYPE_MIN_VALUE (t
) && high
== TYPE_MAX_VALUE (t
))
6557 TYPE_MIN_VALUE (t
) = low
;
6558 TYPE_MAX_VALUE (t
) = high
;
6563 tem
= gnat_substitute_in_type (TREE_TYPE (t
), f
, r
);
6564 if (tem
== TREE_TYPE (t
))
6567 return build_complex_type (tem
);
6573 /* Don't know how to do these yet. */
6578 tree component
= gnat_substitute_in_type (TREE_TYPE (t
), f
, r
);
6579 tree domain
= gnat_substitute_in_type (TYPE_DOMAIN (t
), f
, r
);
6581 if (component
== TREE_TYPE (t
) && domain
== TYPE_DOMAIN (t
))
6584 new = build_array_type (component
, domain
);
6585 TYPE_SIZE (new) = 0;
6586 TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t
);
6587 TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t
);
6589 TYPE_ALIGN (new) = TYPE_ALIGN (t
);
6591 /* If we had bounded the sizes of T by a constant, bound the sizes of
6592 NEW by the same constant. */
6593 if (TREE_CODE (TYPE_SIZE (t
)) == MIN_EXPR
)
6595 = size_binop (MIN_EXPR
, TREE_OPERAND (TYPE_SIZE (t
), 1),
6597 if (TREE_CODE (TYPE_SIZE_UNIT (t
)) == MIN_EXPR
)
6598 TYPE_SIZE_UNIT (new)
6599 = size_binop (MIN_EXPR
, TREE_OPERAND (TYPE_SIZE_UNIT (t
), 1),
6600 TYPE_SIZE_UNIT (new));
6606 case QUAL_UNION_TYPE
:
6610 = (f
== NULL_TREE
&& !TREE_CONSTANT (TYPE_SIZE (t
)));
6611 bool field_has_rep
= false;
6612 tree last_field
= NULL_TREE
;
6614 tree
new = copy_type (t
);
6616 /* Start out with no fields, make new fields, and chain them
6617 in. If we haven't actually changed the type of any field,
6618 discard everything we've done and return the old type. */
6620 TYPE_FIELDS (new) = NULL_TREE
;
6621 TYPE_SIZE (new) = NULL_TREE
;
6623 for (field
= TYPE_FIELDS (t
); field
; field
= TREE_CHAIN (field
))
6625 tree new_field
= copy_node (field
);
6627 TREE_TYPE (new_field
)
6628 = gnat_substitute_in_type (TREE_TYPE (new_field
), f
, r
);
6630 if (DECL_HAS_REP_P (field
) && !DECL_INTERNAL_P (field
))
6631 field_has_rep
= true;
6632 else if (TREE_TYPE (new_field
) != TREE_TYPE (field
))
6633 changed_field
= true;
6635 /* If this is an internal field and the type of this field is
6636 a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If
6637 the type just has one element, treat that as the field.
6638 But don't do this if we are processing a QUAL_UNION_TYPE. */
6639 if (TREE_CODE (t
) != QUAL_UNION_TYPE
6640 && DECL_INTERNAL_P (new_field
)
6641 && (TREE_CODE (TREE_TYPE (new_field
)) == UNION_TYPE
6642 || TREE_CODE (TREE_TYPE (new_field
)) == RECORD_TYPE
))
6644 if (!TYPE_FIELDS (TREE_TYPE (new_field
)))
6647 if (!TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field
))))
6650 = copy_node (TYPE_FIELDS (TREE_TYPE (new_field
)));
6652 /* Make sure omitting the union doesn't change
6654 DECL_ALIGN (next_new_field
) = DECL_ALIGN (new_field
);
6655 new_field
= next_new_field
;
6659 DECL_CONTEXT (new_field
) = new;
6660 SET_DECL_ORIGINAL_FIELD (new_field
,
6661 (DECL_ORIGINAL_FIELD (field
)
6662 ? DECL_ORIGINAL_FIELD (field
) : field
));
6664 /* If the size of the old field was set at a constant,
6665 propagate the size in case the type's size was variable.
6666 (This occurs in the case of a variant or discriminated
6667 record with a default size used as a field of another
6669 DECL_SIZE (new_field
)
6670 = TREE_CODE (DECL_SIZE (field
)) == INTEGER_CST
6671 ? DECL_SIZE (field
) : NULL_TREE
;
6672 DECL_SIZE_UNIT (new_field
)
6673 = TREE_CODE (DECL_SIZE_UNIT (field
)) == INTEGER_CST
6674 ? DECL_SIZE_UNIT (field
) : NULL_TREE
;
6676 if (TREE_CODE (t
) == QUAL_UNION_TYPE
)
6678 tree new_q
= SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field
), f
, r
);
6680 if (new_q
!= DECL_QUALIFIER (new_field
))
6681 changed_field
= true;
6683 /* Do the substitution inside the qualifier and if we find
6684 that this field will not be present, omit it. */
6685 DECL_QUALIFIER (new_field
) = new_q
;
6687 if (integer_zerop (DECL_QUALIFIER (new_field
)))
6692 TYPE_FIELDS (new) = new_field
;
6694 TREE_CHAIN (last_field
) = new_field
;
6696 last_field
= new_field
;
6698 /* If this is a qualified type and this field will always be
6699 present, we are done. */
6700 if (TREE_CODE (t
) == QUAL_UNION_TYPE
6701 && integer_onep (DECL_QUALIFIER (new_field
)))
6705 /* If this used to be a qualified union type, but we now know what
6706 field will be present, make this a normal union. */
6707 if (changed_field
&& TREE_CODE (new) == QUAL_UNION_TYPE
6708 && (!TYPE_FIELDS (new)
6709 || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new)))))
6710 TREE_SET_CODE (new, UNION_TYPE
);
6711 else if (!changed_field
)
6714 gcc_assert (!field_has_rep
);
6717 /* If the size was originally a constant use it. */
6718 if (TYPE_SIZE (t
) && TREE_CODE (TYPE_SIZE (t
)) == INTEGER_CST
6719 && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST
)
6721 TYPE_SIZE (new) = TYPE_SIZE (t
);
6722 TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t
);
6723 SET_TYPE_ADA_SIZE (new, TYPE_ADA_SIZE (t
));
6734 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
6735 needed to represent the object. */
6738 rm_size (tree gnu_type
)
6740 /* For integer types, this is the precision. For record types, we store
6741 the size explicitly. For other types, this is just the size. */
6743 if (INTEGRAL_TYPE_P (gnu_type
) && TYPE_RM_SIZE (gnu_type
))
6744 return TYPE_RM_SIZE (gnu_type
);
6745 else if (TREE_CODE (gnu_type
) == RECORD_TYPE
6746 && TYPE_CONTAINS_TEMPLATE_P (gnu_type
))
6747 /* Return the rm_size of the actual data plus the size of the template. */
6749 size_binop (PLUS_EXPR
,
6750 rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type
)))),
6751 DECL_SIZE (TYPE_FIELDS (gnu_type
)));
6752 else if ((TREE_CODE (gnu_type
) == RECORD_TYPE
6753 || TREE_CODE (gnu_type
) == UNION_TYPE
6754 || TREE_CODE (gnu_type
) == QUAL_UNION_TYPE
)
6755 && !TYPE_IS_FAT_POINTER_P (gnu_type
)
6756 && TYPE_ADA_SIZE (gnu_type
))
6757 return TYPE_ADA_SIZE (gnu_type
);
6759 return TYPE_SIZE (gnu_type
);
6762 /* Return an identifier representing the external name to be used for
6763 GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___"
6764 and the specified suffix. */
6767 create_concat_name (Entity_Id gnat_entity
, const char *suffix
)
6769 Entity_Kind kind
= Ekind (gnat_entity
);
6771 const char *str
= (!suffix
? "" : suffix
);
6772 String_Template temp
= {1, strlen (str
)};
6773 Fat_Pointer fp
= {str
, &temp
};
6775 Get_External_Name_With_Suffix (gnat_entity
, fp
);
6777 /* A variable using the Stdcall convention (meaning we are running
6778 on a Windows box) live in a DLL. Here we adjust its name to use
6779 the jump-table, the _imp__NAME contains the address for the NAME
6781 if ((kind
== E_Variable
|| kind
== E_Constant
)
6782 && Has_Stdcall_Convention (gnat_entity
))
6784 const char *prefix
= "_imp__";
6785 int k
, plen
= strlen (prefix
);
6787 for (k
= 0; k
<= Name_Len
; k
++)
6788 Name_Buffer
[Name_Len
- k
+ plen
] = Name_Buffer
[Name_Len
- k
];
6789 strncpy (Name_Buffer
, prefix
, plen
);
6792 return get_identifier (Name_Buffer
);
6795 /* Return the name to be used for GNAT_ENTITY. If a type, create a
6796 fully-qualified name, possibly with type information encoding.
6797 Otherwise, return the name. */
6800 get_entity_name (Entity_Id gnat_entity
)
6802 Get_Encoded_Name (gnat_entity
);
6803 return get_identifier (Name_Buffer
);
6806 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
6807 string, return a new IDENTIFIER_NODE that is the concatenation of
6808 the name in GNU_ID and SUFFIX. */
6811 concat_id_with_name (tree gnu_id
, const char *suffix
)
6813 int len
= IDENTIFIER_LENGTH (gnu_id
);
6815 strncpy (Name_Buffer
, IDENTIFIER_POINTER (gnu_id
),
6816 IDENTIFIER_LENGTH (gnu_id
));
6817 strncpy (Name_Buffer
+ len
, "___", 3);
6819 strcpy (Name_Buffer
+ len
, suffix
);
6820 return get_identifier (Name_Buffer
);
6823 #include "gt-ada-decl.h"