1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
9 * Copyright (C) 1992-2008, 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 * As a special exception, if you link this file with other files to *
23 * produce an executable, this file does not by itself cause the resulting *
24 * executable to be covered by the GNU General Public License. This except- *
25 * ion does not however invalidate any other reasons why the executable *
26 * file might be covered by the GNU Public License. *
28 * GNAT was originally developed by the GNAT team at New York University. *
29 * Extensive contributions were provided by Ada Core Technologies Inc. *
31 ****************************************************************************/
33 /* Declare all functions and types used by gigi. */
35 /* The largest alignment, in bits, that is needed for using the widest
37 extern unsigned int largest_move_alignment;
39 /* Compute the alignment of the largest mode that can be used for copying
41 extern void gnat_compute_largest_alignment (void);
43 /* GNU_TYPE is a type. Determine if it should be passed by reference by
45 extern bool default_pass_by_ref (tree gnu_type);
47 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type
48 if it should be passed by reference. */
49 extern bool must_pass_by_ref (tree gnu_type);
51 /* Initialize DUMMY_NODE_TABLE. */
52 extern void init_dummy_type (void);
54 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
55 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
56 refer to an Ada type. */
57 extern tree gnat_to_gnu_type (Entity_Id gnat_entity);
59 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
60 entity, this routine returns the equivalent GCC tree for that entity
61 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
64 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
65 initial value (in GCC tree form). This is optional for variables.
66 For renamed entities, GNU_EXPR gives the object being renamed.
68 DEFINITION is nonzero if this call is intended for a definition. This is
69 used for separate compilation where it necessary to know whether an
70 external declaration or a definition should be created if the GCC equivalent
71 was not created previously. The value of 1 is normally used for a nonzero
72 DEFINITION, but a value of 2 is used in special circumstances, defined in
74 extern tree gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr,
77 /* Similar, but if the returned value is a COMPONENT_REF, return the
79 extern tree gnat_to_gnu_field_decl (Entity_Id gnat_entity);
81 /* Wrap up compilation of T, a TYPE_DECL, possibly deferring it. */
82 extern void rest_of_type_decl_compilation (tree t);
84 /* Start a new statement group chained to the previous group. */
85 extern void start_stmt_group (void);
87 /* Add GNU_STMT to the current BLOCK_STMT node. */
88 extern void add_stmt (tree gnu_stmt);
90 /* Similar, but set the location of GNU_STMT to that of GNAT_NODE. */
91 extern void add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node);
93 /* Return code corresponding to the current code group. It is normally
94 a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if
95 BLOCK or cleanups were set. */
96 extern tree end_stmt_group (void);
98 /* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */
99 extern void set_block_for_group (tree);
101 /* Add a declaration statement for GNU_DECL to the current BLOCK_STMT node.
102 Get SLOC from GNAT_ENTITY. */
103 extern void add_decl_expr (tree gnu_decl, Entity_Id gnat_entity);
105 /* Finalize any From_With_Type incomplete types. We do this after processing
106 our compilation unit and after processing its spec, if this is a body. */
107 extern void finalize_from_with_types (void);
109 /* Return the equivalent type to be used for GNAT_ENTITY, if it's a
110 kind of type (such E_Task_Type) that has a different type which Gigi
111 uses for its representation. If the type does not have a special type
112 for its representation, return GNAT_ENTITY. If a type is supposed to
113 exist, but does not, abort unless annotating types, in which case
114 return Empty. If GNAT_ENTITY is Empty, return Empty. */
115 extern Entity_Id Gigi_Equivalent_Type (Entity_Id);
117 /* Given GNAT_ENTITY, elaborate all expressions that are required to
118 be elaborated at the point of its definition, but do nothing else. */
119 extern void elaborate_entity (Entity_Id gnat_entity);
121 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
122 any entities on its entity chain similarly. */
123 extern void mark_out_of_scope (Entity_Id gnat_entity);
125 /* Make a dummy type corresponding to GNAT_TYPE. */
126 extern tree make_dummy_type (Entity_Id gnat_type);
128 /* Get the unpadded version of a GNAT type. */
129 extern tree get_unpadded_type (Entity_Id gnat_entity);
131 /* Called when we need to protect a variable object using a save_expr. */
132 extern tree maybe_variable (tree gnu_operand);
134 /* Create a record type that contains a SIZE bytes long field of TYPE with a
135 starting bit position so that it is aligned to ALIGN bits, and leaving at
136 least ROOM bytes free before the field. BASE_ALIGN is the alignment the
137 record is guaranteed to get. */
138 extern tree make_aligning_type (tree type, unsigned int align, tree size,
139 unsigned int base_align, int room);
141 /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type
142 if needed. We have already verified that SIZE and TYPE are large enough.
144 GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and
147 IS_USER_TYPE is true if we must be sure we complete the original type.
149 DEFINITION is true if this type is being defined.
151 SAME_RM_SIZE is true if the RM_Size of the resulting type is to be
152 set to its TYPE_SIZE; otherwise, it's set to the RM_Size of the original
154 extern tree maybe_pad_type (tree type, tree size, unsigned int align,
155 Entity_Id gnat_entity, const char *name_trailer,
156 bool is_user_type, bool definition,
159 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
160 the value passed against the list of choices. */
161 extern tree choices_to_gnu (tree operand, Node_Id choices);
163 /* Given a type T, a FIELD_DECL F, and a replacement value R, return a new
164 type with all size expressions that contain F updated by replacing F
165 with R. If F is NULL_TREE, always make a new RECORD_TYPE, even if
166 nothing has changed. */
167 extern tree substitute_in_type (tree t, tree f, tree r);
169 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
170 needed to represent the object. */
171 extern tree rm_size (tree gnu_type);
173 /* Given GNU_ID, an IDENTIFIER_NODE containing a name, and SUFFIX, a
174 string, return a new IDENTIFIER_NODE that is the concatenation of
175 the name in GNU_ID and SUFFIX. */
176 extern tree concat_id_with_name (tree gnu_id, const char *suffix);
178 /* Return the name to be used for GNAT_ENTITY. If a type, create a
179 fully-qualified name, possibly with type information encoding.
180 Otherwise, return the name. */
181 extern tree get_entity_name (Entity_Id gnat_entity);
183 /* Return a name for GNAT_ENTITY concatenated with two underscores and
185 extern tree create_concat_name (Entity_Id gnat_entity, const char *suffix);
187 /* If true, then gigi is being called on an analyzed but unexpanded tree, and
188 the only purpose of the call is to properly annotate types with
189 representation information. */
190 extern bool type_annotate_only;
192 /* Current file name without path */
193 extern const char *ref_filename;
195 /* This structure must be kept synchronized with Call_Back_End. */
196 struct File_Info_Type
198 File_Name_Type File_Name;
199 Nat Num_Source_Lines;
202 /* This is the main program of the back-end. It sets up all the table
203 structures and then generates code.
205 ??? Needs parameter descriptions */
207 extern void gigi (Node_Id gnat_root, int max_gnat_node, int number_name,
208 struct Node *nodes_ptr, Node_Id *next_node_ptr,
209 Node_Id *prev_node_ptr, struct Elist_Header *elists_ptr,
210 struct Elmt_Item *elmts_ptr,
211 struct String_Entry *strings_ptr,
212 Char_Code *strings_chars_ptr,
213 struct List_Header *list_headers_ptr,
215 struct File_Info_Type *file_info_ptr ATTRIBUTE_UNUSED,
216 Entity_Id standard_integer,
217 Entity_Id standard_long_long_float,
218 Entity_Id standard_exception_type,
219 Int gigi_operating_mode);
221 /* GNAT_NODE is the root of some GNAT tree. Return the root of the
222 GCC tree corresponding to that GNAT tree. Normally, no code is generated;
223 we just return an equivalent tree which is used elsewhere to generate
225 extern tree gnat_to_gnu (Node_Id gnat_node);
227 /* GNU_STMT is a statement. We generate code for that statement. */
228 extern void gnat_expand_stmt (tree gnu_stmt);
230 /* ??? missing documentation */
231 extern int gnat_gimplify_expr (tree *expr_p, tree *pre_p,
232 tree *post_p ATTRIBUTE_UNUSED);
234 /* Do the processing for the declaration of a GNAT_ENTITY, a type. If
235 a separate Freeze node exists, delay the bulk of the processing. Otherwise
236 make a GCC type for GNAT_ENTITY and set up the correspondence. */
237 extern void process_type (Entity_Id gnat_entity);
239 /* Convert SLOC into LOCUS. Return true if SLOC corresponds to a source code
240 location and false if it doesn't. In the former case, set the Gigi global
241 variable REF_FILENAME to the simple debug file name as given by sinput. */
242 extern bool Sloc_to_locus (Source_Ptr Sloc, location_t *locus);
244 /* Post an error message. MSG is the error message, properly annotated.
245 NODE is the node at which to post the error and the node to use for the
247 extern void post_error (const char *, Node_Id);
249 /* Similar, but NODE is the node at which to post the error and ENT
250 is the node to use for the "&" substitution. */
251 extern void post_error_ne (const char *msg, Node_Id node, Entity_Id ent);
253 /* Similar, but NODE is the node at which to post the error, ENT is the node
254 to use for the "&" substitution, and N is the number to use for the ^. */
255 extern void post_error_ne_num (const char *msg, Node_Id node, Entity_Id ent,
258 /* Similar to post_error_ne_num, but T is a GCC tree representing the number
259 to write. If the tree represents a constant that fits within a
260 host integer, the text inside curly brackets in MSG will be output
261 (presumably including a '^'). Otherwise that text will not be output
262 and the text inside square brackets will be output instead. */
263 extern void post_error_ne_tree (const char *msg, Node_Id node, Entity_Id ent,
266 /* Similar to post_error_ne_tree, except that NUM is a second
267 integer to write in the message. */
268 extern void post_error_ne_tree_2 (const char *msg, Node_Id node, Entity_Id ent,
271 /* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */
272 extern tree protect_multiple_eval (tree exp);
274 /* Return a label to branch to for the exception type in KIND or NULL_TREE
276 extern tree get_exception_label (char);
278 /* Current node being treated, in case gigi_abort or Check_Elaboration_Code
280 extern Node_Id error_gnat_node;
282 /* This is equivalent to stabilize_reference in tree.c, but we know how to
283 handle our own nodes and we take extra arguments. FORCE says whether to
284 force evaluation of everything. We set SUCCESS to true unless we walk
285 through something we don't know how to stabilize. */
286 extern tree maybe_stabilize_reference (tree ref, bool force, bool *success);
288 /* Highest number in the front-end node table. */
289 extern int max_gnat_nodes;
291 /* If nonzero, pretend we are allocating at global level. */
292 extern int force_global;
294 /* Standard data type sizes. Most of these are not used. */
296 #ifndef CHAR_TYPE_SIZE
297 #define CHAR_TYPE_SIZE BITS_PER_UNIT
300 #ifndef SHORT_TYPE_SIZE
301 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
304 #ifndef INT_TYPE_SIZE
305 #define INT_TYPE_SIZE BITS_PER_WORD
308 #ifndef LONG_TYPE_SIZE
309 #define LONG_TYPE_SIZE BITS_PER_WORD
312 #ifndef LONG_LONG_TYPE_SIZE
313 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
316 #ifndef FLOAT_TYPE_SIZE
317 #define FLOAT_TYPE_SIZE BITS_PER_WORD
320 #ifndef DOUBLE_TYPE_SIZE
321 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
324 #ifndef LONG_DOUBLE_TYPE_SIZE
325 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
328 /* The choice of SIZE_TYPE here is very problematic. We need a signed
329 type whose bit width is Pmode. Assume "long" is such a type here. */
331 #define SIZE_TYPE "long int"
333 /* Data structures used to represent attributes. */
337 ATTR_MACHINE_ATTRIBUTE,
340 ATTR_LINK_CONSTRUCTOR,
341 ATTR_LINK_DESTRUCTOR,
354 /* Table of machine-independent internal attributes. */
355 extern const struct attribute_spec gnat_internal_attribute_table[];
357 /* Define the entries in the standard data array. */
358 enum standard_datatypes
360 /* Various standard data types and nodes. */
361 ADT_longest_float_type,
364 /* The type of an exception. */
367 /* Type declaration node <==> typedef void *T */
370 /* Function type declaration -- void T() */
373 /* Type declaration node <==> typedef void *T() */
376 /* A function declaration node for a run-time function for allocating memory.
377 Ada allocators cause calls to this function to be generated. */
380 /* Likewise for freeing memory. */
383 /* Types and decls used by our temporary exception mechanism. See
384 init_gigi_decls for details. */
392 ADT_update_setjmp_buf_decl,
393 ADT_raise_nodefer_decl,
394 ADT_begin_handler_decl,
395 ADT_end_handler_decl,
400 extern GTY(()) tree gnat_std_decls[(int) ADT_LAST];
401 extern GTY(()) tree gnat_raise_decls[(int) LAST_REASON_CODE + 1];
403 #define longest_float_type_node gnat_std_decls[(int) ADT_longest_float_type]
404 #define void_type_decl_node gnat_std_decls[(int) ADT_void_type_decl]
405 #define except_type_node gnat_std_decls[(int) ADT_except_type]
406 #define ptr_void_type_node gnat_std_decls[(int) ADT_ptr_void_type]
407 #define void_ftype gnat_std_decls[(int) ADT_void_ftype]
408 #define ptr_void_ftype gnat_std_decls[(int) ADT_ptr_void_ftype]
409 #define malloc_decl gnat_std_decls[(int) ADT_malloc_decl]
410 #define free_decl gnat_std_decls[(int) ADT_free_decl]
411 #define jmpbuf_type gnat_std_decls[(int) ADT_jmpbuf_type]
412 #define jmpbuf_ptr_type gnat_std_decls[(int) ADT_jmpbuf_ptr_type]
413 #define get_jmpbuf_decl gnat_std_decls[(int) ADT_get_jmpbuf_decl]
414 #define set_jmpbuf_decl gnat_std_decls[(int) ADT_set_jmpbuf_decl]
415 #define get_excptr_decl gnat_std_decls[(int) ADT_get_excptr_decl]
416 #define setjmp_decl gnat_std_decls[(int) ADT_setjmp_decl]
417 #define longjmp_decl gnat_std_decls[(int) ADT_longjmp_decl]
418 #define update_setjmp_buf_decl gnat_std_decls[(int) ADT_update_setjmp_buf_decl]
419 #define raise_nodefer_decl gnat_std_decls[(int) ADT_raise_nodefer_decl]
420 #define begin_handler_decl gnat_std_decls[(int) ADT_begin_handler_decl]
421 #define others_decl gnat_std_decls[(int) ADT_others_decl]
422 #define all_others_decl gnat_std_decls[(int) ADT_all_others_decl]
423 #define end_handler_decl gnat_std_decls[(int) ADT_end_handler_decl]
425 /* Routines expected by the gcc back-end. They must have exactly the same
426 prototype and names as below. */
428 /* Returns nonzero if we are currently in the global binding level. */
429 extern int global_bindings_p (void);
431 /* Enter and exit a new binding level. */
432 extern void gnat_pushlevel (void);
433 extern void gnat_poplevel (void);
435 /* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL
436 and point FNDECL to this BLOCK. */
437 extern void set_current_block_context (tree fndecl);
439 /* Set the jmpbuf_decl for the current binding level to DECL. */
440 extern void set_block_jmpbuf_decl (tree decl);
442 /* Get the setjmp_decl, if any, for the current binding level. */
443 extern tree get_block_jmpbuf_decl (void);
445 /* Records a ..._DECL node DECL as belonging to the current lexical scope
446 and uses GNAT_NODE for location information. */
447 extern void gnat_pushdecl (tree decl, Node_Id gnat_node);
449 extern void gnat_init_decl_processing (void);
450 extern void init_gigi_decls (tree long_long_float_type, tree exception_type);
451 extern void gnat_init_gcc_eh (void);
453 /* Return an integer type with the number of bits of precision given by
454 PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise
455 it is a signed type. */
456 extern tree gnat_type_for_size (unsigned precision, int unsignedp);
458 /* Return a data type that has machine mode MODE. UNSIGNEDP selects
459 an unsigned type; otherwise a signed type is returned. */
460 extern tree gnat_type_for_mode (enum machine_mode mode, int unsignedp);
462 /* Emit debug info for all global variable declarations. */
463 extern void gnat_write_global_declarations (void);
465 /* Return the unsigned version of a TYPE_NODE, a scalar type. */
466 extern tree gnat_unsigned_type (tree type_node);
468 /* Return the signed version of a TYPE_NODE, a scalar type. */
469 extern tree gnat_signed_type (tree type_node);
471 /* Create an expression whose value is that of EXPR,
472 converted to type TYPE. The TREE_TYPE of the value
473 is always TYPE. This function implements all reasonable
474 conversions; callers should filter out those that are
475 not permitted by the language being compiled. */
476 extern tree convert (tree type, tree expr);
478 /* Routines created solely for the tree translator's sake. Their prototypes
479 can be changed as desired. */
481 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
482 GNU_DECL is the GCC tree which is to be associated with
483 GNAT_ENTITY. Such gnu tree node is always an ..._DECL node.
484 If NO_CHECK is nonzero, the latter check is suppressed.
485 If GNU_DECL is zero, a previous association is to be reset. */
486 extern void save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl,
489 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
490 Return the ..._DECL node that was associated with it. If there is no tree
491 node associated with GNAT_ENTITY, abort. */
492 extern tree get_gnu_tree (Entity_Id gnat_entity);
494 /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */
495 extern bool present_gnu_tree (Entity_Id gnat_entity);
497 /* Initialize tables for above routines. */
498 extern void init_gnat_to_gnu (void);
500 /* Given a record type RECORD_TYPE and a chain of FIELD_DECL nodes FIELDLIST,
501 finish constructing the record or union type. If REP_LEVEL is zero, this
502 record has no representation clause and so will be entirely laid out here.
503 If REP_LEVEL is one, this record has a representation clause and has been
504 laid out already; only set the sizes and alignment. If REP_LEVEL is two,
505 this record is derived from a parent record and thus inherits its layout;
506 only make a pass on the fields to finalize them. If DO_NOT_FINALIZE is
507 true, the record type is expected to be modified afterwards so it will
508 not be sent to the back-end for finalization. */
509 extern void finish_record_type (tree record_type, tree fieldlist,
510 int rep_level, bool do_not_finalize);
512 /* Wrap up compilation of RECORD_TYPE, i.e. most notably output all
513 the debug information associated with it. It need not be invoked
514 directly in most cases since finish_record_type takes care of doing
515 so, unless explicitly requested not to through DO_NOT_FINALIZE. */
516 extern void rest_of_record_type_compilation (tree record_type);
518 /* Returns a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the
519 subprogram. If it is void_type_node, then we are dealing with a procedure,
520 otherwise we are dealing with a function. PARAM_DECL_LIST is a list of
521 PARM_DECL nodes that are the subprogram arguments. CICO_LIST is the
522 copy-in/copy-out list to be stored into TYPE_CI_CO_LIST.
523 RETURNS_UNCONSTRAINED is true if the function returns an unconstrained
524 object. RETURNS_BY_REF is true if the function returns by reference.
525 RETURNS_BY_TARGET_PTR is true if the function is to be passed (as its
526 first parameter) the address of the place to copy its result. */
527 extern tree create_subprog_type (tree return_type, tree param_decl_list,
528 tree cico_list, bool returns_unconstrained,
530 bool returns_by_target_ptr);
532 /* Return a copy of TYPE, but safe to modify in any way. */
533 extern tree copy_type (tree type);
535 /* Return an INTEGER_TYPE of SIZETYPE with range MIN to MAX and whose
536 TYPE_INDEX_TYPE is INDEX. GNAT_NODE is used for the position of
538 extern tree create_index_type (tree min, tree max, tree index,
541 /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type (a character
542 string) and TYPE is a ..._TYPE node giving its data type.
543 ARTIFICIAL_P is true if this is a declaration that was generated
544 by the compiler. DEBUG_INFO_P is true if we need to write debugging
545 information about this type. GNAT_NODE is used for the position of
547 extern tree create_type_decl (tree type_name, tree type,
548 struct attrib *attr_list,
549 bool artificial_p, bool debug_info_p,
552 /* Returns a GCC VAR_DECL or CONST_DECL node.
554 VAR_NAME gives the name of the variable. ASM_NAME is its assembler name
555 (if provided). TYPE is its data type (a GCC ..._TYPE node). VAR_INIT is
556 the GCC tree for an optional initial expression; NULL_TREE if none.
558 CONST_FLAG is true if this variable is constant.
560 PUBLIC_FLAG is true if this definition is to be made visible outside of
561 the current compilation unit. This flag should be set when processing the
562 variable definitions in a package specification. EXTERN_FLAG is nonzero
563 when processing an external variable declaration (as opposed to a
564 definition: no storage is to be allocated for the variable here).
566 STATIC_FLAG is only relevant when not at top level. In that case
567 it indicates whether to always allocate storage to the variable.
569 GNAT_NODE is used for the position of the decl. */
570 extern tree create_var_decl (tree var_name, tree asm_name, tree type,
571 tree var_init, bool const_flag,
572 bool public_flag, bool extern_flag,
574 struct attrib *attr_list, Node_Id gnat_node);
576 /* Similar to create_var_decl, forcing the creation of a VAR_DECL node. */
577 extern tree create_true_var_decl (tree var_name, tree asm_name, tree type,
578 tree var_init, bool const_flag,
579 bool public_flag, bool extern_flag,
581 struct attrib *attr_list, Node_Id gnat_node);
583 /* Given a DECL and ATTR_LIST, apply the listed attributes. */
584 extern void process_attributes (tree decl, struct attrib *attr_list);
586 /* Record a global renaming pointer. */
587 void record_global_renaming_pointer (tree);
589 /* Invalidate the global renaming pointers. */
590 void invalidate_global_renaming_pointers (void);
592 /* Returns a FIELD_DECL node. FIELD_NAME the field name, FIELD_TYPE is its
593 type, and RECORD_TYPE is the type of the parent. PACKED is nonzero if
594 this field is in a record type with a "pragma pack". If SIZE is nonzero
595 it is the specified size for this field. If POS is nonzero, it is the bit
596 position. If ADDRESSABLE is nonzero, it means we are allowed to take
597 the address of this field for aliasing purposes. */
598 extern tree create_field_decl (tree field_name, tree field_type,
599 tree record_type, int packed, tree size,
600 tree pos, int addressable);
602 /* Returns a PARM_DECL node. PARAM_NAME is the name of the parameter,
603 PARAM_TYPE is its type. READONLY is true if the parameter is
604 readonly (either an In parameter or an address of a pass-by-ref
606 extern tree create_param_decl (tree param_name, tree param_type,
609 /* Returns a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram,
610 ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE
611 node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of
612 PARM_DECL nodes chained through the TREE_CHAIN field).
614 INLINE_FLAG, PUBLIC_FLAG, EXTERN_FLAG, and ATTR_LIST are used to set the
615 appropriate fields in the FUNCTION_DECL. GNAT_NODE gives the location. */
616 extern tree create_subprog_decl (tree subprog_name, tree asm_name,
617 tree subprog_type, tree param_decl_list,
618 bool inlinee_flag, bool public_flag,
620 struct attrib *attr_list, Node_Id gnat_node);
622 /* Returns a LABEL_DECL node for LABEL_NAME. */
623 extern tree create_label_decl (tree label_name);
625 /* Set up the framework for generating code for SUBPROG_DECL, a subprogram
626 body. This routine needs to be invoked before processing the declarations
627 appearing in the subprogram. */
628 extern void begin_subprog_body (tree subprog_decl);
630 /* Finish the definition of the current subprogram and compile it all the way
631 to assembler language output. BODY is the tree corresponding to
633 extern void end_subprog_body (tree body);
635 /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE.
636 EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs.
637 Return a constructor for the template. */
638 extern tree build_template (tree template_type, tree array_type, tree expr);
640 /* Build a VMS descriptor from a Mechanism_Type, which must specify
641 a descriptor type, and the GCC type of an object. Each FIELD_DECL
642 in the type contains in its DECL_INITIAL the expression to use when
643 a constructor is made for the type. GNAT_ENTITY is a gnat node used
644 to print out an error message if the mechanism cannot be applied to
645 an object of that type and also for the name. */
646 extern tree build_vms_descriptor (tree type, Mechanism_Type mech,
647 Entity_Id gnat_entity);
649 /* Build a stub for the subprogram specified by the GCC tree GNU_SUBPROG
650 and the GNAT node GNAT_SUBPROG. */
651 extern void build_function_stub (tree gnu_subprog, Entity_Id gnat_subprog);
653 /* Build a type to be used to represent an aliased object whose nominal
654 type is an unconstrained array. This consists of a RECORD_TYPE containing
655 a field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an
656 ARRAY_TYPE. If ARRAY_TYPE is that of the unconstrained array, this
657 is used to represent an arbitrary unconstrained object. Use NAME
658 as the name of the record. */
659 extern tree build_unc_object_type (tree template_type, tree object_type,
662 /* Same as build_unc_object_type, but taking a thin or fat pointer type
663 instead of the template type. */
664 extern tree build_unc_object_type_from_ptr (tree thin_fat_ptr_type,
665 tree object_type, tree name);
667 /* Shift the component offsets within an unconstrained object TYPE to make it
668 suitable for use as a designated type for thin pointers. */
669 extern void shift_unc_components_for_thin_pointers (tree type);
671 /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. In
672 the normal case this is just two adjustments, but we have more to do
673 if NEW is an UNCONSTRAINED_ARRAY_TYPE. */
674 extern void update_pointer_to (tree old_type, tree new_type);
676 /* EXP is an expression for the size of an object. If this size contains
677 discriminant references, replace them with the maximum (if MAX_P) or
678 minimum (if !MAX_P) possible value of the discriminant. */
679 extern tree max_size (tree exp, bool max_p);
681 /* Remove all conversions that are done in EXP. This includes converting
682 from a padded type or to a left-justified modular type. If TRUE_ADDRESS
683 is true, always return the address of the containing object even if
684 the address is not bit-aligned. */
685 extern tree remove_conversions (tree exp, bool true_address);
687 /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that
688 refers to the underlying array. If its type has TYPE_CONTAINS_TEMPLATE_P,
689 likewise return an expression pointing to the underlying array. */
690 extern tree maybe_unconstrained_array (tree exp);
692 /* Return an expression that does an unchecked conversion of EXPR to TYPE.
693 If NOTRUNC_P is true, truncation operations should be suppressed. */
694 extern tree unchecked_convert (tree type, tree expr, bool notrunc_p);
696 /* Return the appropriate GCC tree code for the specified GNAT type,
697 the latter being a record type as predicated by Is_Record_Type. */
698 extern enum tree_code tree_code_for_record_type (Entity_Id);
700 /* Return true if GNU_TYPE is suitable as the type of a non-aliased
701 component of an aggregate type. */
702 extern bool type_for_nonaliased_component_p (tree);
704 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
707 This preparation consists of taking the ordinary
708 representation of an expression EXPR and producing a valid tree
709 boolean expression describing whether EXPR is nonzero. We could
710 simply always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
711 but we optimize comparisons, &&, ||, and !.
713 The resulting type should always be the same as the input type.
714 This function is simpler than the corresponding C version since
715 the only possible operands will be things of Boolean type. */
716 extern tree gnat_truthvalue_conversion (tree expr);
718 /* Return the base type of TYPE. */
719 extern tree get_base_type (tree type);
721 /* EXP is a GCC tree representing an address. See if we can find how
722 strictly the object at that address is aligned. Return that alignment
723 strictly the object at that address is aligned. Return that alignment
724 in bits. If we don't know anything about the alignment, return 0. */
725 extern unsigned int known_alignment (tree exp);
727 /* Return true if VALUE is a multiple of FACTOR. FACTOR must be a power
729 extern bool value_factor_p (tree value, HOST_WIDE_INT factor);
731 /* Make a binary operation of kind OP_CODE. RESULT_TYPE is the type
732 desired for the result. Usually the operation is to be performed
733 in that type. For MODIFY_EXPR and ARRAY_REF, RESULT_TYPE may be 0
734 in which case the type to be used will be derived from the operands. */
735 extern tree build_binary_op (enum tree_code op_code, tree retult_type,
736 tree left_operand, tree right_operand);
738 /* Similar, but make unary operation. */
739 extern tree build_unary_op (enum tree_code op_code, tree result_type,
742 /* Similar, but for COND_EXPR. */
743 extern tree build_cond_expr (tree result_type, tree condition_operand,
744 tree true_operand, tree false_operand);
746 /* Similar, but for RETURN_EXPR. */
747 extern tree build_return_expr (tree result_decl, tree ret_val);
749 /* Build a CALL_EXPR to call FUNDECL with one argument, ARG. Return
751 extern tree build_call_1_expr (tree fundecl, tree arg);
753 /* Build a CALL_EXPR to call FUNDECL with two argument, ARG1 & ARG2. Return
755 extern tree build_call_2_expr (tree fundecl, tree arg1, tree arg2);
757 /* Likewise to call FUNDECL with no arguments. */
758 extern tree build_call_0_expr (tree fundecl);
760 /* Call a function that raises an exception and pass the line number and file
761 name, if requested. MSG says which exception function to call.
763 GNAT_NODE is the gnat node conveying the source location for which the
764 error should be signaled, or Empty in which case the error is signaled on
765 the current ref_file_name/input_line.
767 KIND says which kind of exception this is for
768 (N_Raise_{Constraint,Storage,Program}_Error). */
769 extern tree build_call_raise (int msg, Node_Id gnat_node, char kind);
771 /* Return a CONSTRUCTOR of TYPE whose list is LIST. This is not the
772 same as build_constructor in the language-independent tree.c. */
773 extern tree gnat_build_constructor (tree type, tree list);
775 /* Return a COMPONENT_REF to access a field that is given by COMPONENT,
776 an IDENTIFIER_NODE giving the name of the field, FIELD, a FIELD_DECL,
777 for the field, or both. Don't fold the result if NO_FOLD_P. */
778 extern tree build_component_ref (tree record_variable, tree component,
779 tree field, bool no_fold_p);
781 /* Build a GCC tree to call an allocation or deallocation function.
782 If GNU_OBJ is nonzero, it is an object to deallocate. Otherwise,
783 generate an allocator.
785 GNU_SIZE is the size of the object and ALIGN is the alignment.
786 GNAT_PROC, if present is a procedure to call and GNAT_POOL is the
787 storage pool to use. If not preset, malloc and free will be used. */
788 extern tree build_call_alloc_dealloc (tree gnu_obj, tree gnu_size,
789 unsigned align, Entity_Id gnat_proc,
790 Entity_Id gnat_pool, Node_Id gnat_node);
792 /* Build a GCC tree to correspond to allocating an object of TYPE whose
793 initial value if INIT, if INIT is nonzero. Convert the expression to
794 RESULT_TYPE, which must be some type of pointer. Return the tree.
795 GNAT_PROC and GNAT_POOL optionally give the procedure to call and
796 the storage pool to use. GNAT_NODE is used to provide an error
797 location for restriction violations messages. If IGNORE_INIT_TYPE is
798 true, ignore the type of INIT for the purpose of determining the size;
799 this will cause the maximum size to be allocated if TYPE is of
800 self-referential size. */
801 extern tree build_allocator (tree type, tree init, tree result_type,
802 Entity_Id gnat_proc, Entity_Id gnat_pool,
803 Node_Id gnat_node, bool);
805 /* Fill in a VMS descriptor for EXPR and return a constructor for it.
806 GNAT_FORMAL is how we find the descriptor record. */
808 extern tree fill_vms_descriptor (tree expr, Entity_Id gnat_formal);
810 /* Indicate that we need to make the address of EXPR_NODE and it therefore
811 should not be allocated in a register. Return true if successful. */
812 extern bool gnat_mark_addressable (tree expr_node);
814 /* Implementation of the builtin_function langhook. */
815 extern tree gnat_builtin_function (tree decl);
817 /* Search the chain of currently reachable declarations for a builtin
818 FUNCTION_DECL node corresponding to function NAME (an IDENTIFIER_NODE).
819 Return the first node found, if any, or NULL_TREE otherwise. */
820 extern tree builtin_decl_for (tree name ATTRIBUTE_UNUSED);
822 /* This function is called by the front end to enumerate all the supported
823 modes for the machine. We pass a function which is called back with
824 the following integer parameters:
826 FLOAT_P nonzero if this represents a floating-point mode
827 COMPLEX_P nonzero is this represents a complex mode
828 COUNT count of number of items, nonzero for vector mode
829 PRECISION number of bits in data representation
830 MANTISSA number of bits in mantissa, if FP and known, else zero.
831 SIZE number of bits used to store data
832 ALIGN number of bits to which mode is aligned. */
833 extern void enumerate_modes (void (*f) (int, int, int, int, int, int,
836 /* These are temporary function to deal with recent GCC changes related to
837 FP type sizes and precisions. */
838 extern int fp_prec_to_size (int prec);
839 extern int fp_size_to_prec (int size);
841 /* These functions return the basic data type sizes and related parameters
842 about the target machine. */
844 extern Pos get_target_bits_per_unit (void);
845 extern Pos get_target_bits_per_word (void);
846 extern Pos get_target_char_size (void);
847 extern Pos get_target_wchar_t_size (void);
848 extern Pos get_target_short_size (void);
849 extern Pos get_target_int_size (void);
850 extern Pos get_target_long_size (void);
851 extern Pos get_target_long_long_size (void);
852 extern Pos get_target_float_size (void);
853 extern Pos get_target_double_size (void);
854 extern Pos get_target_long_double_size (void);
855 extern Pos get_target_pointer_size (void);
856 extern Pos get_target_maximum_alignment (void);
857 extern Pos get_target_default_allocator_alignment (void);
858 extern Pos get_target_maximum_default_alignment (void);
859 extern Pos get_target_maximum_allowed_alignment (void);
860 extern Nat get_float_words_be (void);
861 extern Nat get_words_be (void);
862 extern Nat get_bytes_be (void);
863 extern Nat get_bits_be (void);
864 extern Nat get_strict_alignment (void);