1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
9 * Copyright (C) 1992-2004 Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 2, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
20 * MA 02111-1307, USA. *
22 * 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 /* The largest alignment, in bits, that is needed for using the widest
35 extern unsigned int largest_move_alignment;
37 /* Declare all functions and types used by gigi. */
39 /* Record the current code position in GNAT_NODE. */
40 extern void record_code_position (Node_Id);
42 /* Insert the code for GNAT_NODE at the position saved for that node. */
43 extern void insert_code_for (Node_Id);
45 /* Compute the alignment of the largest mode that can be used for copying
47 extern void gnat_compute_largest_alignment (void);
49 /* Routine called by gcc for emitting a stack check. GNU_EXPR is the
50 expression that contains the last address on the stack to check. */
51 extern tree emit_stack_check (tree);
53 /* Make a TRANSFORM_EXPR to later expand GNAT_NODE into code. */
54 extern tree make_transform_expr (Node_Id);
56 /* GNU_TYPE is a type. Determine if it should be passed by reference by
58 extern int default_pass_by_ref (tree);
60 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type
61 if it should be passed by reference. */
62 extern int must_pass_by_ref (tree);
64 /* Elaboration routines for the front end. */
65 extern void elab_all_gnat (void);
67 /* Initialize DUMMY_NODE_TABLE. */
68 extern void init_dummy_type (void);
70 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
71 entity, this routine returns the equivalent GCC tree for that entity
72 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
75 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
76 initial value (in GCC tree form). This is optional for variables.
77 For renamed entities, GNU_EXPR gives the object being renamed.
79 DEFINITION is nonzero if this call is intended for a definition. This is
80 used for separate compilation where it necessary to know whether an
81 external declaration or a definition should be created if the GCC equivalent
82 was not created previously. The value of 1 is normally used for a non-zero
83 DEFINITION, but a value of 2 is used in special circumstances, defined in
85 extern tree gnat_to_gnu_entity (Entity_Id, tree, int);
87 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
88 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
89 refer to an Ada type. */
90 extern tree gnat_to_gnu_type (Entity_Id);
92 /* Add GNU_STMT to the current BLOCK_STMT node. */
93 extern void add_stmt (tree);
95 /* Add a declaration statement for GNU_DECL to the current BLOCK_STMT node.
96 Get SLOC from Entity_Id. */
97 extern void add_decl_stmt (tree, Entity_Id);
99 /* Given GNAT_ENTITY, elaborate all expressions that are required to
100 be elaborated at the point of its definition, but do nothing else. */
101 extern void elaborate_entity (Entity_Id);
103 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
104 any entities on its entity chain similarly. */
105 extern void mark_out_of_scope (Entity_Id);
107 /* Make a dummy type corresponding to GNAT_TYPE. */
108 extern tree make_dummy_type (Entity_Id);
110 /* Get the unpadded version of a GNAT type. */
111 extern tree get_unpadded_type (Entity_Id);
113 /* Called when we need to protect a variable object using a save_expr. */
114 extern tree maybe_variable (tree, Node_Id);
116 /* Create a record type that contains a field of TYPE with a starting bit
117 position so that it is aligned to ALIGN bits. */
118 /* Create a record type that contains a field of TYPE with a starting bit
119 position so that it is aligned to ALIGN bits and is SIZE bytes long. */
120 extern tree make_aligning_type (tree, int, tree);
122 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
123 the value passed against the list of choices. */
124 extern tree choices_to_gnu (tree, Node_Id);
126 /* Given a type T, a FIELD_DECL F, and a replacement value R,
127 return a new type with all size expressions that contain F
128 updated by replacing F with R. This is identical to GCC's
129 substitute_in_type except that it knows about TYPE_INDEX_TYPE. */
130 extern tree gnat_substitute_in_type (tree, tree, tree);
132 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
133 needed to represent the object. */
134 extern tree rm_size (tree);
136 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
137 string, return a new IDENTIFIER_NODE that is the concatenation of
138 the name in GNU_ID and SUFFIX. */
139 extern tree concat_id_with_name (tree, const char *);
141 /* Return the name to be used for GNAT_ENTITY. If a type, create a
142 fully-qualified name, possibly with type information encoding.
143 Otherwise, return the name. */
144 extern tree get_entity_name (Entity_Id);
146 /* Return a name for GNAT_ENTITY concatenated with two underscores and
148 extern tree create_concat_name (Entity_Id, const char *);
150 /* Flag indicating whether file names are discarded in exception messages */
151 extern int discard_file_names;
153 /* If true, then gigi is being called on an analyzed but unexpanded
154 tree, and the only purpose of the call is to properly annotate
155 types with representation information */
156 extern int type_annotate_only;
158 /* Current file name without path */
159 extern const char *ref_filename;
161 /* List of TREE_LIST nodes representing a block stack. TREE_VALUE
162 of each gives the variable used for the setjmp buffer in the current
164 extern GTY(()) tree gnu_block_stack;
166 /* This is the main program of the back-end. It sets up all the table
167 structures and then generates code. */
169 extern void gigi (Node_Id, int, int, struct Node *, Node_Id *, Node_Id *,
170 struct Elist_Header *, struct Elmt_Item *,
171 struct String_Entry *, Char_Code *, struct List_Header *,
172 Int, char *, Entity_Id, Entity_Id, Entity_Id, Int);
174 /* This function is the driver of the GNAT to GCC tree transformation process.
175 GNAT_NODE is the root of some gnat tree. It generates code for that
177 extern void gnat_to_code (Node_Id);
179 /* GNAT_NODE is the root of some GNAT tree. Return the root of the
180 GCC tree corresponding to that GNAT tree. Normally, no code is generated;
181 we just return an equivalent tree which is used elsewhere to generate
183 extern tree gnat_to_gnu (Node_Id);
185 /* GNU_STMT is a statement. We generate code for that statement. */
186 extern void gnat_expand_stmt (tree);
188 /* Do the processing for the declaration of a GNAT_ENTITY, a type. If
189 a separate Freeze node exists, delay the bulk of the processing. Otherwise
190 make a GCC type for GNAT_ENTITY and set up the correspondance. */
192 extern void process_type (Entity_Id);
194 /* Determine the input_filename and the input_line from the source location
195 (Sloc) of GNAT_NODE node. Set the global variable input_filename and
196 input_line. If WRITE_NOTE_P is true, emit a line number note. */
197 extern void set_lineno (Node_Id, int);
199 /* Likewise, but passed a Sloc. */
200 extern void set_lineno_from_sloc (Source_Ptr, int);
202 /* Post an error message. MSG is the error message, properly annotated.
203 NODE is the node at which to post the error and the node to use for the
205 extern void post_error (const char *, Node_Id);
207 /* Similar, but NODE is the node at which to post the error and ENT
208 is the node to use for the "&" substitution. */
209 extern void post_error_ne (const char *, Node_Id, Entity_Id);
211 /* Similar, but NODE is the node at which to post the error, ENT is the node
212 to use for the "&" substitution, and N is the number to use for the ^. */
213 extern void post_error_ne_num (const char *, Node_Id, Entity_Id, int);
215 /* Similar to post_error_ne_num, but T is a GCC tree representing the number
216 to write. If the tree represents a constant that fits within a
217 host integer, the text inside curly brackets in MSG will be output
218 (presumably including a '^'). Otherwise that text will not be output
219 and the text inside square brackets will be output instead. */
220 extern void post_error_ne_tree (const char *, Node_Id, Entity_Id, tree);
222 /* Similar to post_error_ne_tree, except that NUM is a second
223 integer to write in the message. */
224 extern void post_error_ne_tree_2 (const char *, Node_Id, Entity_Id, tree, int);
226 /* Set the node for a second '&' in the error message. */
227 extern void set_second_error_entity (Entity_Id);
229 /* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */
230 extern tree protect_multiple_eval (tree);
232 /* Signal abort, with "Gigi abort" as the error label, and error_gnat_node
233 as the relevant node that provides the location info for the error.
234 The single parameter CODE is an integer code that is included in the
235 additional error message generated. */
236 extern void gigi_abort (int) ATTRIBUTE_NORETURN;
238 /* Initialize the table that maps GNAT codes to GCC codes for simple
239 binary and unary operations. */
240 extern void init_code_table (void);
242 /* Current node being treated, in case gigi_abort or Check_Elaboration_Code
244 extern Node_Id error_gnat_node;
246 /* This is equivalent to stabilize_reference in GCC's tree.c, but we know
247 how to handle our new nodes and we take an extra argument that says
248 whether to force evaluation of everything. */
250 extern tree gnat_stabilize_reference (tree, int);
252 /* Highest number in the front-end node table. */
253 extern int max_gnat_nodes;
255 /* If nonzero, pretend we are allocating at global level. */
256 extern int force_global;
258 /* Standard data type sizes. Most of these are not used. */
260 #ifndef CHAR_TYPE_SIZE
261 #define CHAR_TYPE_SIZE BITS_PER_UNIT
264 #ifndef SHORT_TYPE_SIZE
265 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
268 #ifndef INT_TYPE_SIZE
269 #define INT_TYPE_SIZE BITS_PER_WORD
272 #ifndef LONG_TYPE_SIZE
273 #define LONG_TYPE_SIZE BITS_PER_WORD
276 #ifndef LONG_LONG_TYPE_SIZE
277 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
280 #ifndef FLOAT_TYPE_SIZE
281 #define FLOAT_TYPE_SIZE BITS_PER_WORD
284 #ifndef DOUBLE_TYPE_SIZE
285 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
288 #ifndef LONG_DOUBLE_TYPE_SIZE
289 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
292 /* The choice of SIZE_TYPE here is very problematic. We need a signed
293 type whose bit width is Pmode. Assume "long" is such a type here. */
295 #define SIZE_TYPE "long int"
298 /* Data structures used to represent attributes. */
300 enum attr_type {ATTR_MACHINE_ATTRIBUTE, ATTR_LINK_ALIAS,
301 ATTR_LINK_SECTION, ATTR_WEAK_EXTERNAL};
312 /* Define the entries in the standard data array. */
313 enum standard_datatypes
315 /* Various standard data types and nodes. */
316 ADT_longest_float_type,
319 /* The type of an exception. */
322 /* Type declaration node <==> typedef void *T */
325 /* Function type declaration -- void T() */
328 /* Type declaration node <==> typedef void *T() */
331 /* A function declaration node for a run-time function for allocating memory.
332 Ada allocators cause calls to this function to be generated. */
335 /* Likewise for freeing memory. */
338 /* Types and decls used by our temporary exception mechanism. See
339 init_gigi_decls for details. */
347 ADT_update_setjmp_buf_decl,
348 ADT_raise_nodefer_decl,
349 ADT_begin_handler_decl,
350 ADT_end_handler_decl,
353 extern GTY(()) tree gnat_std_decls[(int) ADT_LAST];
354 extern GTY(()) tree gnat_raise_decls[(int) LAST_REASON_CODE + 1];
356 #define longest_float_type_node gnat_std_decls[(int) ADT_longest_float_type]
357 #define void_type_decl_node gnat_std_decls[(int) ADT_void_type_decl]
358 #define except_type_node gnat_std_decls[(int) ADT_except_type]
359 #define ptr_void_type_node gnat_std_decls[(int) ADT_ptr_void_type]
360 #define void_ftype gnat_std_decls[(int) ADT_void_ftype]
361 #define ptr_void_ftype gnat_std_decls[(int) ADT_ptr_void_ftype]
362 #define malloc_decl gnat_std_decls[(int) ADT_malloc_decl]
363 #define free_decl gnat_std_decls[(int) ADT_free_decl]
364 #define jmpbuf_type gnat_std_decls[(int) ADT_jmpbuf_type]
365 #define jmpbuf_ptr_type gnat_std_decls[(int) ADT_jmpbuf_ptr_type]
366 #define get_jmpbuf_decl gnat_std_decls[(int) ADT_get_jmpbuf_decl]
367 #define set_jmpbuf_decl gnat_std_decls[(int) ADT_set_jmpbuf_decl]
368 #define get_excptr_decl gnat_std_decls[(int) ADT_get_excptr_decl]
369 #define setjmp_decl gnat_std_decls[(int) ADT_setjmp_decl]
370 #define longjmp_decl gnat_std_decls[(int) ADT_longjmp_decl]
371 #define update_setjmp_buf_decl gnat_std_decls[(int) ADT_update_setjmp_buf_decl]
372 #define raise_nodefer_decl gnat_std_decls[(int) ADT_raise_nodefer_decl]
373 #define begin_handler_decl gnat_std_decls[(int) ADT_begin_handler_decl]
374 #define end_handler_decl gnat_std_decls[(int) ADT_end_handler_decl]
376 /* Routines expected by the gcc back-end. They must have exactly the same
377 prototype and names as below. */
379 /* Returns non-zero if we are currently in the global binding level */
380 extern int global_bindings_p (void);
382 /* Returns the list of declarations in the current level. Note that this list
383 is in reverse order (it has to be so for back-end compatibility). */
384 extern tree getdecls (void);
386 /* Enter and exit a new binding level. */
387 extern void gnat_pushlevel (void);
388 extern void gnat_poplevel (void);
390 /* Insert BLOCK at the end of the list of subblocks of the
391 current binding level. This is used when a BIND_EXPR is expanded,
392 to handle the BLOCK node inside the BIND_EXPR. */
393 extern void insert_block (tree);
395 /* Return nonzero if the are any variables in the current block. */
396 extern int block_has_vars (void);
398 /* Records a ..._DECL node DECL as belonging to the current lexical scope.
399 Returns the ..._DECL node. */
400 extern tree pushdecl (tree);
402 /* Create the predefined scalar types such as `integer_type_node' needed
403 in the gcc back-end and initialize the global binding level. */
404 extern void gnat_init_decl_processing (void);
405 extern void init_gigi_decls (tree, tree);
406 extern void gnat_init_gcc_eh (void);
408 /* Return an integer type with the number of bits of precision given by
409 PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise
410 it is a signed type. */
411 extern tree gnat_type_for_size (unsigned, int);
413 /* Return a data type that has machine mode MODE. UNSIGNEDP selects
414 an unsigned type; otherwise a signed type is returned. */
415 extern tree gnat_type_for_mode (enum machine_mode, int);
417 /* Return the unsigned version of a TYPE_NODE, a scalar type. */
418 extern tree gnat_unsigned_type (tree);
420 /* Return the signed version of a TYPE_NODE, a scalar type. */
421 extern tree gnat_signed_type (tree);
423 /* Return a type the same as TYPE except unsigned or signed according to
425 extern tree gnat_signed_or_unsigned_type (int, tree);
427 /* Create an expression whose value is that of EXPR,
428 converted to type TYPE. The TREE_TYPE of the value
429 is always TYPE. This function implements all reasonable
430 conversions; callers should filter out those that are
431 not permitted by the language being compiled. */
432 extern tree convert (tree, tree);
434 /* Routines created solely for the tree translator's sake. Their prototypes
435 can be changed as desired. */
437 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
438 GNU_DECL is the GCC tree which is to be associated with
439 GNAT_ENTITY. Such gnu tree node is always an ..._DECL node.
440 If NO_CHECK is nonzero, the latter check is suppressed.
441 If GNU_DECL is zero, a previous association is to be reset. */
442 extern void save_gnu_tree (Entity_Id, tree, int);
444 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
445 Return the ..._DECL node that was associated with it. If there is no tree
446 node associated with GNAT_ENTITY, abort. */
447 extern tree get_gnu_tree (Entity_Id);
449 /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */
450 extern int present_gnu_tree (Entity_Id);
452 /* Initialize tables for above routines. */
453 extern void init_gnat_to_gnu (void);
455 /* Given a record type (RECORD_TYPE) and a chain of FIELD_DECL
456 nodes (FIELDLIST), finish constructing the record or union type.
457 If HAS_REP is nonzero, this record has a rep clause; don't call
458 layout_type but merely set the size and alignment ourselves.
459 If DEFER_DEBUG is nonzero, do not call the debugging routines
460 on this type; it will be done later. */
461 extern void finish_record_type (tree, tree, int, int);
463 /* Returns a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the
464 subprogram. If it is void_type_node, then we are dealing with a procedure,
465 otherwise we are dealing with a function. PARAM_DECL_LIST is a list of
466 PARM_DECL nodes that are the subprogram arguments. CICO_LIST is the
467 copy-in/copy-out list to be stored into TYPE_CI_CO_LIST.
468 RETURNS_UNCONSTRAINED is nonzero if the function returns an unconstrained
469 object. RETURNS_BY_REF is nonzero if the function returns by reference.
470 RETURNS_WITH_DSP is nonzero if the function is to return with a
471 depressed stack pointer. */
472 extern tree create_subprog_type (tree, tree, tree, int, int, int);
474 /* Return a copy of TYPE, but safe to modify in any way. */
475 extern tree copy_type (tree);
477 /* Return an INTEGER_TYPE of SIZETYPE with range MIN to MAX and whose
478 TYPE_INDEX_TYPE is INDEX. */
479 extern tree create_index_type (tree, tree, tree);
481 /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type (a character
482 string) and TYPE is a ..._TYPE node giving its data type.
483 ARTIFICIAL_P is nonzero if this is a declaration that was generated
484 by the compiler. DEBUG_INFO_P is nonzero if we need to write debugging
485 information about this type. */
486 extern tree create_type_decl (tree, tree, struct attrib *, int, int);
488 /* Returns a GCC VAR_DECL node. VAR_NAME gives the name of the variable.
489 ASM_NAME is its assembler name (if provided). TYPE is
490 its data type (a GCC ..._TYPE node). VAR_INIT is the GCC tree for an
491 optional initial expression; NULL_TREE if none.
493 CONST_FLAG is nonzero if this variable is constant.
495 PUBLIC_FLAG is nonzero if this definition is to be made visible outside of
496 the current compilation unit. This flag should be set when processing the
497 variable definitions in a package specification. EXTERN_FLAG is nonzero
498 when processing an external variable declaration (as opposed to a
499 definition: no storage is to be allocated for the variable here).
500 STATIC_FLAG is only relevant when not at top level. In that case
501 it indicates whether to always allocate storage to the variable. */
502 extern tree create_var_decl (tree, tree, tree, tree, int, int, int, int,
505 /* Given a DECL and ATTR_LIST, apply the listed attributes. */
506 extern void process_attributes (tree, struct attrib *);
508 /* Obtain any pending elaborations and clear the old list. */
509 extern tree get_pending_elaborations (void);
511 /* Return nonzero if there are pending elaborations. */
512 extern int pending_elaborations_p (void);
514 /* Save a copy of the current pending elaboration list and make a new
516 extern void push_pending_elaborations (void);
518 /* Pop the stack of pending elaborations. */
519 extern void pop_pending_elaborations (void);
521 /* Return the current position in pending_elaborations so we can insert
522 elaborations after that point. */
523 extern tree get_elaboration_location (void);
525 /* Insert the current elaborations after ELAB, which is in some elaboration
527 extern void insert_elaboration_list (tree);
529 /* Add some pending elaborations to the current list. */
530 extern void add_pending_elaborations (tree, tree);
532 /* Returns a FIELD_DECL node. FIELD_NAME the field name, FIELD_TYPE is its
533 type, and RECORD_TYPE is the type of the parent. PACKED is nonzero if
534 this field is in a record type with a "pragma pack". If SIZE is nonzero
535 it is the specified size for this field. If POS is nonzero, it is the bit
536 position. If ADDRESSABLE is nonzero, it means we are allowed to take
537 the address of this field for aliasing purposes. */
538 extern tree create_field_decl (tree, tree, tree, int, tree, tree, int);
540 /* Returns a PARM_DECL node. PARAM_NAME is the name of the parameter,
541 PARAM_TYPE is its type. READONLY is nonzero if the parameter is
542 readonly (either an IN parameter or an address of a pass-by-ref
544 extern tree create_param_decl (tree, tree, int);
546 /* Returns a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram,
547 ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE
548 node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of
549 PARM_DECL nodes chained through the TREE_CHAIN field).
551 INLINE_FLAG, PUBLIC_FLAG, and EXTERN_FLAG are used to set the appropriate
552 fields in the FUNCTION_DECL. */
553 extern tree create_subprog_decl (tree, tree, tree, tree, int, int, int,
556 /* Returns a LABEL_DECL node for LABEL_NAME. */
557 extern tree create_label_decl (tree);
559 /* Set up the framework for generating code for SUBPROG_DECL, a subprogram
560 body. This routine needs to be invoked before processing the declarations
561 appearing in the subprogram. */
562 extern void begin_subprog_body (tree);
564 /* Finish the definition of the current subprogram and compile it all the way
565 to assembler language output. */
566 extern void end_subprog_body (void);
568 /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE.
569 EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs.
570 Return a constructor for the template. */
571 extern tree build_template (tree, tree, tree);
573 /* Build a VMS descriptor from a Mechanism_Type, which must specify
574 a descriptor type, and the GCC type of an object. Each FIELD_DECL
575 in the type contains in its DECL_INITIAL the expression to use when
576 a constructor is made for the type. GNAT_ENTITY is a gnat node used
577 to print out an error message if the mechanism cannot be applied to
578 an object of that type and also for the name. */
580 extern tree build_vms_descriptor (tree, Mechanism_Type, Entity_Id);
582 /* Build a type to be used to represent an aliased object whose nominal
583 type is an unconstrained array. This consists of a RECORD_TYPE containing
584 a field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an
585 ARRAY_TYPE. If ARRAY_TYPE is that of the unconstrained array, this
586 is used to represent an arbitrary unconstrained object. Use NAME
587 as the name of the record. */
588 extern tree build_unc_object_type (tree, tree, tree);
590 /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. In
591 the normal case this is just two adjustments, but we have more to do
592 if NEW is an UNCONSTRAINED_ARRAY_TYPE. */
593 extern void update_pointer_to (tree, tree);
595 /* EXP is an expression for the size of an object. If this size contains
596 discriminant references, replace them with the maximum (if MAX_P) or
597 minimum (if ! MAX_P) possible value of the discriminant. */
598 extern tree max_size (tree, int);
600 /* Remove all conversions that are done in EXP. This includes converting
601 from a padded type or to a left-justified modular type. If TRUE_ADDRESS
602 is nonzero, always return the address of the containing object even if
603 the address is not bit-aligned. */
604 extern tree remove_conversions (tree, int);
606 /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that
607 refers to the underlying array. If its type has TYPE_CONTAINS_TEMPLATE_P,
608 likewise return an expression pointing to the underlying array. */
609 extern tree maybe_unconstrained_array (tree);
611 /* Return an expression that does an unchecked converstion of EXPR to TYPE.
612 If NOTRUNC_P is set, truncation operations should be suppressed. */
613 extern tree unchecked_convert (tree, tree, int);
615 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
618 This preparation consists of taking the ordinary
619 representation of an expression expr and producing a valid tree
620 boolean expression describing whether expr is nonzero. We could
621 simply always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
622 but we optimize comparisons, &&, ||, and !.
624 The resulting type should always be the same as the input type.
625 This function is simpler than the corresponding C version since
626 the only possible operands will be things of Boolean type. */
627 extern tree gnat_truthvalue_conversion (tree);
629 /* Return the base type of TYPE. */
630 extern tree get_base_type (tree);
632 /* Likewise, but only return types known at Ada source. */
633 extern tree get_ada_base_type (tree);
635 /* EXP is a GCC tree representing an address. See if we can find how
636 strictly the object at that address is aligned. Return that alignment
637 strictly the object at that address is aligned. Return that alignment
638 in bits. If we don't know anything about the alignment, return 0. */
639 extern unsigned int known_alignment (tree);
641 /* Make a binary operation of kind OP_CODE. RESULT_TYPE is the type
642 desired for the result. Usually the operation is to be performed
643 in that type. For MODIFY_EXPR and ARRAY_REF, RESULT_TYPE may be 0
644 in which case the type to be used will be derived from the operands. */
645 extern tree build_binary_op (enum tree_code, tree, tree, tree);
647 /* Similar, but make unary operation. */
648 extern tree build_unary_op (enum tree_code, tree, tree);
650 /* Similar, but for COND_EXPR. */
651 extern tree build_cond_expr (tree, tree, tree, tree);
653 /* Build a CALL_EXPR to call FUNDECL with one argument, ARG. Return
655 extern tree build_call_1_expr (tree, tree);
657 /* Build a CALL_EXPR to call FUNDECL with two argument, ARG1 & ARG2. Return
659 extern tree build_call_2_expr (tree, tree, tree);
661 /* Likewise to call FUNDECL with no arguments. */
662 extern tree build_call_0_expr (tree);
664 /* Call a function that raises an exception and pass the line number and file
665 name, if requested. MSG says which exception function to call. */
666 extern tree build_call_raise (int);
668 /* Return a CONSTRUCTOR of TYPE whose list is LIST. This is not the
669 same as build_constructor in the language-independent tree.c. */
670 extern tree gnat_build_constructor (tree, tree);
672 /* Return a COMPONENT_REF to access a field that is given by COMPONENT,
673 an IDENTIFIER_NODE giving the name of the field, FIELD, a FIELD_DECL,
674 for the field, or both. Don't fold the result if NO_FOLD_P. */
675 extern tree build_component_ref (tree, tree, tree, int);
677 /* Build a GCC tree to call an allocation or deallocation function.
678 If GNU_OBJ is nonzero, it is an object to deallocate. Otherwise,
679 genrate an allocator.
681 GNU_SIZE is the size of the object and ALIGN is the alignment.
682 GNAT_PROC, if present is a procedure to call and GNAT_POOL is the
683 storage pool to use. If not preset, malloc and free will be used. */
684 extern tree build_call_alloc_dealloc (tree, tree, unsigned int, Entity_Id,
687 /* Build a GCC tree to correspond to allocating an object of TYPE whose
688 initial value if INIT, if INIT is nonzero. Convert the expression to
689 RESULT_TYPE, which must be some type of pointer. Return the tree.
690 GNAT_PROC and GNAT_POOL optionally give the procedure to call and
691 the storage pool to use. GNAT_NODE is used to provide an error
692 location for restriction violations messages. */
693 extern tree build_allocator (tree, tree, tree, Entity_Id, Entity_Id, Node_Id);
695 /* Fill in a VMS descriptor for EXPR and return a constructor for it.
696 GNAT_FORMAL is how we find the descriptor record. */
698 extern tree fill_vms_descriptor (tree, Entity_Id);
700 /* Indicate that we need to make the address of EXPR_NODE and it therefore
701 should not be allocated in a register. Return true if successful. */
702 extern bool gnat_mark_addressable (tree);
704 /* This function is called by the front end to enumerate all the supported
705 modes for the machine. We pass a function which is called back with
706 the following integer parameters:
708 FLOAT_P nonzero if this represents a floating-point mode
709 COMPLEX_P nonzero is this represents a complex mode
710 COUNT count of number of items, nonzero for vector mode
711 PRECISION number of bits in data representation
712 MANTISSA number of bits in mantissa, if FP and known, else zero.
713 SIZE number of bits used to store data
714 ALIGN number of bits to which mode is aligned. */
715 extern void enumerate_modes (void (*f) (int, int, int, int, int, int,
718 /* These are temporary function to deal with recent GCC changes related to
719 FP type sizes and precisions. */
720 extern int fp_prec_to_size (int);
721 extern int fp_size_to_prec (int);
723 /* These functions return the basic data type sizes and related parameters
724 about the target machine. */
726 extern Pos get_target_bits_per_unit (void);
727 extern Pos get_target_bits_per_word (void);
728 extern Pos get_target_char_size (void);
729 extern Pos get_target_wchar_t_size (void);
730 extern Pos get_target_short_size (void);
731 extern Pos get_target_int_size (void);
732 extern Pos get_target_long_size (void);
733 extern Pos get_target_long_long_size (void);
734 extern Pos get_target_float_size (void);
735 extern Pos get_target_double_size (void);
736 extern Pos get_target_long_double_size (void);
737 extern Pos get_target_pointer_size (void);
738 extern Pos get_target_maximum_alignment (void);
739 extern Nat get_float_words_be (void);
740 extern Nat get_words_be (void);
741 extern Nat get_bytes_be (void);
742 extern Nat get_bits_be (void);
743 extern Nat get_strict_alignment (void);