1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
9 * Copyright (C) 1992-2003 Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 2, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
20 * MA 02111-1307, USA. *
22 * 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 /* See if DECL has an RTL that is indirect via a pseudo-register or a
40 memory location and replace it with an indirect reference if so.
41 This improves the debugger's ability to display the value. */
42 extern void adjust_decl_rtl
PARAMS ((tree
));
44 /* Record the current code position in GNAT_NODE. */
45 extern void record_code_position
PARAMS ((Node_Id
));
47 /* Insert the code for GNAT_NODE at the position saved for that node. */
48 extern void insert_code_for
PARAMS ((Node_Id
));
50 /* Compute the alignment of the largest mode that can be used for copying
52 extern void gnat_compute_largest_alignment
PARAMS ((void));
54 /* Routine called by gcc for emitting a stack check. GNU_EXPR is the
55 expression that contains the last address on the stack to check. */
56 extern tree emit_stack_check
PARAMS ((tree
));
58 /* Make a TRANSFORM_EXPR to later expand GNAT_NODE into code. */
59 extern tree make_transform_expr
PARAMS ((Node_Id
));
61 /* Update the setjmp buffer BUF with the current stack pointer. We assume
62 here that a __builtin_setjmp was done to BUF. */
63 extern void update_setjmp_buf
PARAMS ((tree
));
65 /* GNU_TYPE is a type. Determine if it should be passed by reference by
67 extern int default_pass_by_ref
PARAMS ((tree
));
69 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type
70 if it should be passed by reference. */
71 extern int must_pass_by_ref
PARAMS ((tree
));
73 /* Elaboration routines for the front end. */
74 extern void elab_all_gnat
PARAMS ((void));
76 /* Initialize DUMMY_NODE_TABLE. */
77 extern void init_dummy_type
PARAMS ((void));
79 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
80 entity, this routine returns the equivalent GCC tree for that entity
81 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
84 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
85 initial value (in GCC tree form). This is optional for variables.
86 For renamed entities, GNU_EXPR gives the object being renamed.
88 DEFINITION is nonzero if this call is intended for a definition. This is
89 used for separate compilation where it necessary to know whether an
90 external declaration or a definition should be created if the GCC equivalent
91 was not created previously. The value of 1 is normally used for a non-zero
92 DEFINITION, but a value of 2 is used in special circumstances, defined in
94 extern tree gnat_to_gnu_entity
PARAMS ((Entity_Id
, tree
, int));
96 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
97 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
98 refer to an Ada type. */
99 extern tree gnat_to_gnu_type
PARAMS ((Entity_Id
));
101 /* Given GNAT_ENTITY, elaborate all expressions that are required to
102 be elaborated at the point of its definition, but do nothing else. */
103 extern void elaborate_entity
PARAMS ((Entity_Id
));
105 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
106 any entities on its entity chain similarly. */
107 extern void mark_out_of_scope
PARAMS ((Entity_Id
));
109 /* Make a dummy type corresponding to GNAT_TYPE. */
110 extern tree make_dummy_type
PARAMS ((Entity_Id
));
112 /* Get the unpadded version of a GNAT type. */
113 extern tree get_unpadded_type
PARAMS ((Entity_Id
));
115 /* Called when we need to protect a variable object using a save_expr. */
116 extern tree maybe_variable
PARAMS ((tree
, Node_Id
));
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. */
120 /* Create a record type that contains a field of TYPE with a starting bit
121 position so that it is aligned to ALIGN bits and is SIZE bytes long. */
122 extern tree make_aligning_type
PARAMS ((tree
, int, tree
));
124 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
125 the value passed against the list of choices. */
126 extern tree choices_to_gnu
PARAMS ((tree
, Node_Id
));
128 /* Given a type T, a FIELD_DECL F, and a replacement value R,
129 return a new type with all size expressions that contain F
130 updated by replacing F with R. This is identical to GCC's
131 substitute_in_type except that it knows about TYPE_INDEX_TYPE. */
132 extern tree gnat_substitute_in_type
PARAMS ((tree
, tree
, tree
));
134 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
135 needed to represent the object. */
136 extern tree rm_size
PARAMS ((tree
));
138 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
139 string, return a new IDENTIFIER_NODE that is the concatenation of
140 the name in GNU_ID and SUFFIX. */
141 extern tree concat_id_with_name
PARAMS ((tree
, const char *));
143 /* Return the name to be used for GNAT_ENTITY. If a type, create a
144 fully-qualified name, possibly with type information encoding.
145 Otherwise, return the name. */
146 extern tree get_entity_name
PARAMS ((Entity_Id
));
148 /* Return a name for GNAT_ENTITY concatenated with two underscores and
150 extern tree create_concat_name
PARAMS ((Entity_Id
, const char *));
152 /* Flag indicating whether file names are discarded in exception messages */
153 extern int discard_file_names
;
155 /* If true, then gigi is being called on an analyzed but unexpanded
156 tree, and the only purpose of the call is to properly annotate
157 types with representation information */
158 extern int type_annotate_only
;
160 /* Current file name without path */
161 extern const char *ref_filename
;
163 /* List of TREE_LIST nodes representing a block stack. TREE_VALUE
164 of each gives the variable used for the setjmp buffer in the current
166 extern GTY(()) tree gnu_block_stack
;
168 /* This is the main program of the back-end. It sets up all the table
169 structures and then generates code. */
171 extern void gigi
PARAMS ((Node_Id
, int, int, struct Node
*,
172 Node_Id
*, Node_Id
*,
173 struct Elist_Header
*,
175 struct String_Entry
*,
177 struct List_Header
*,
179 Entity_Id
, Entity_Id
, Entity_Id
,
182 /* This function is the driver of the GNAT to GCC tree transformation process.
183 GNAT_NODE is the root of some gnat tree. It generates code for that
185 extern void gnat_to_code
PARAMS ((Node_Id
));
187 /* GNAT_NODE is the root of some GNAT tree. Return the root of the
188 GCC tree corresponding to that GNAT tree. Normally, no code is generated;
189 we just return an equivalent tree which is used elsewhere to generate
191 extern tree gnat_to_gnu
PARAMS ((Node_Id
));
193 /* Do the processing for the declaration of a GNAT_ENTITY, a type. If
194 a separate Freeze node exists, delay the bulk of the processing. Otherwise
195 make a GCC type for GNAT_ENTITY and set up the correspondance. */
197 extern void process_type
PARAMS ((Entity_Id
));
199 /* Determine the input_filename and the input_line from the source location
200 (Sloc) of GNAT_NODE node. Set the global variable input_filename and
201 input_line. If WRITE_NOTE_P is true, emit a line number note. */
202 extern void set_lineno
PARAMS ((Node_Id
, int));
204 /* Post an error message. MSG is the error message, properly annotated.
205 NODE is the node at which to post the error and the node to use for the
207 extern void post_error
PARAMS ((const char *, Node_Id
));
209 /* Similar, but NODE is the node at which to post the error and ENT
210 is the node to use for the "&" substitution. */
211 extern void post_error_ne
PARAMS ((const char *, Node_Id
, Entity_Id
));
213 /* Similar, but NODE is the node at which to post the error, ENT is the node
214 to use for the "&" substitution, and N is the number to use for the ^. */
215 extern void post_error_ne_num
PARAMS ((const char *, Node_Id
, Entity_Id
,
218 /* Similar to post_error_ne_num, but T is a GCC tree representing the number
219 to write. If the tree represents a constant that fits within a
220 host integer, the text inside curly brackets in MSG will be output
221 (presumably including a '^'). Otherwise that text will not be output
222 and the text inside square brackets will be output instead. */
223 extern void post_error_ne_tree
PARAMS ((const char *, Node_Id
, Entity_Id
,
226 /* Similar to post_error_ne_tree, except that NUM is a second
227 integer to write in the message. */
228 extern void post_error_ne_tree_2
PARAMS ((const char *, Node_Id
, Entity_Id
,
231 /* Set the node for a second '&' in the error message. */
232 extern void set_second_error_entity
PARAMS ((Entity_Id
));
234 /* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */
235 extern tree protect_multiple_eval
PARAMS ((tree
));
237 /* Signal abort, with "Gigi abort" as the error label, and error_gnat_node
238 as the relevant node that provides the location info for the error.
239 The single parameter CODE is an integer code that is included in the
240 additional error message generated. */
241 extern void gigi_abort
PARAMS ((int)) ATTRIBUTE_NORETURN
;
243 /* Initialize the table that maps GNAT codes to GCC codes for simple
244 binary and unary operations. */
245 extern void init_code_table
PARAMS ((void));
247 /* Current node being treated, in case gigi_abort or Check_Elaboration_Code
249 extern Node_Id error_gnat_node
;
251 /* This is equivalent to stabilize_reference in GCC's tree.c, but we know
252 how to handle our new nodes and we take an extra argument that says
253 whether to force evaluation of everything. */
255 extern tree gnat_stabilize_reference
PARAMS ((tree
, int));
257 /* Highest number in the front-end node table. */
258 extern int max_gnat_nodes
;
260 /* If nonzero, pretend we are allocating at global level. */
261 extern int force_global
;
263 /* Standard data type sizes. Most of these are not used. */
265 #ifndef CHAR_TYPE_SIZE
266 #define CHAR_TYPE_SIZE BITS_PER_UNIT
269 #ifndef SHORT_TYPE_SIZE
270 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
273 #ifndef INT_TYPE_SIZE
274 #define INT_TYPE_SIZE BITS_PER_WORD
277 #ifndef LONG_TYPE_SIZE
278 #define LONG_TYPE_SIZE BITS_PER_WORD
281 #ifndef LONG_LONG_TYPE_SIZE
282 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
285 #ifndef FLOAT_TYPE_SIZE
286 #define FLOAT_TYPE_SIZE BITS_PER_WORD
289 #ifndef DOUBLE_TYPE_SIZE
290 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
293 #ifndef LONG_DOUBLE_TYPE_SIZE
294 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
297 /* The choice of SIZE_TYPE here is very problematic. We need a signed
298 type whose bit width is Pmode. Assume "long" is such a type here. */
300 #define SIZE_TYPE "long int"
303 /* Data structures used to represent attributes. */
305 enum attr_type
{ATTR_MACHINE_ATTRIBUTE
, ATTR_LINK_ALIAS
,
306 ATTR_LINK_SECTION
, ATTR_WEAK_EXTERNAL
};
317 /* Define the entries in the standard data array. */
318 enum standard_datatypes
320 /* Various standard data types and nodes. */
321 ADT_longest_float_type
,
324 /* The type of an exception. */
327 /* Type declaration node <==> typedef void *T */
330 /* Function type declaration -- void T() */
333 /* Type declaration node <==> typedef void *T() */
336 /* A function declaration node for a run-time function for allocating memory.
337 Ada allocators cause calls to this function to be generated. */
340 /* Likewise for freeing memory. */
343 /* Types and decls used by our temporary exception mechanism. See
344 init_gigi_decls for details. */
352 ADT_raise_nodefer_decl
,
353 ADT_begin_handler_decl
,
354 ADT_end_handler_decl
,
357 extern GTY(()) tree gnat_std_decls
[(int) ADT_LAST
];
358 extern GTY(()) tree gnat_raise_decls
[(int) LAST_REASON_CODE
+ 1];
360 #define longest_float_type_node gnat_std_decls[(int) ADT_longest_float_type]
361 #define void_type_decl_node gnat_std_decls[(int) ADT_void_type_decl]
362 #define except_type_node gnat_std_decls[(int) ADT_except_type]
363 #define ptr_void_type_node gnat_std_decls[(int) ADT_ptr_void_type]
364 #define void_ftype gnat_std_decls[(int) ADT_void_ftype]
365 #define ptr_void_ftype gnat_std_decls[(int) ADT_ptr_void_ftype]
366 #define malloc_decl gnat_std_decls[(int) ADT_malloc_decl]
367 #define free_decl gnat_std_decls[(int) ADT_free_decl]
368 #define jmpbuf_type gnat_std_decls[(int) ADT_jmpbuf_type]
369 #define jmpbuf_ptr_type gnat_std_decls[(int) ADT_jmpbuf_ptr_type]
370 #define get_jmpbuf_decl gnat_std_decls[(int) ADT_get_jmpbuf_decl]
371 #define set_jmpbuf_decl gnat_std_decls[(int) ADT_set_jmpbuf_decl]
372 #define get_excptr_decl gnat_std_decls[(int) ADT_get_excptr_decl]
373 #define setjmp_decl gnat_std_decls[(int) ADT_setjmp_decl]
374 #define longjmp_decl gnat_std_decls[(int) ADT_longjmp_decl]
375 #define raise_nodefer_decl gnat_std_decls[(int) ADT_raise_nodefer_decl]
376 #define begin_handler_decl gnat_std_decls[(int) ADT_begin_handler_decl]
377 #define end_handler_decl gnat_std_decls[(int) ADT_end_handler_decl]
379 /* Routines expected by the gcc back-end. They must have exactly the same
380 prototype and names as below. */
382 /* Returns non-zero if we are currently in the global binding level */
383 extern int global_bindings_p
PARAMS ((void));
385 /* Returns the list of declarations in the current level. Note that this list
386 is in reverse order (it has to be so for back-end compatibility). */
387 extern tree getdecls
PARAMS ((void));
389 /* Nonzero if the current level needs to have a BLOCK made. */
390 extern int kept_level_p
PARAMS ((void));
392 /* Enter a new binding level. The input parameter is ignored, but has to be
393 specified for back-end compatibility. */
394 extern void pushlevel
PARAMS ((int));
396 /* Exit a binding level.
397 Pop the level off, and restore the state of the identifier-decl mappings
398 that were in effect when this level was entered.
400 If KEEP is nonzero, this level had explicit declarations, so
401 and create a "block" (a BLOCK node) for the level
402 to record its declarations and subblocks for symbol table output.
404 If FUNCTIONBODY is nonzero, this level is the body of a function,
405 so create a block as if KEEP were set and also clear out all
408 If REVERSE is nonzero, reverse the order of decls before putting
409 them into the BLOCK. */
410 extern tree poplevel
PARAMS ((int,int, int));
412 /* Insert BLOCK at the end of the list of subblocks of the
413 current binding level. This is used when a BIND_EXPR is expanded,
414 to handle the BLOCK node inside the BIND_EXPR. */
415 extern void insert_block
PARAMS ((tree
));
417 /* Set the BLOCK node for the innermost scope
418 (the one we are currently in). */
419 extern void set_block
PARAMS ((tree
));
421 /* Records a ..._DECL node DECL as belonging to the current lexical scope.
422 Returns the ..._DECL node. */
423 extern tree pushdecl
PARAMS ((tree
));
425 /* Create the predefined scalar types such as `integer_type_node' needed
426 in the gcc back-end and initialize the global binding level. */
427 extern void gnat_init_decl_processing
PARAMS ((void));
428 extern void init_gigi_decls
PARAMS ((tree
, tree
));
429 extern void gnat_init_gcc_eh
PARAMS ((void));
431 /* Return an integer type with the number of bits of precision given by
432 PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise
433 it is a signed type. */
434 extern tree gnat_type_for_size
PARAMS ((unsigned, int));
436 /* Return a data type that has machine mode MODE. UNSIGNEDP selects
437 an unsigned type; otherwise a signed type is returned. */
438 extern tree gnat_type_for_mode
PARAMS ((enum machine_mode
, int));
440 /* Return the unsigned version of a TYPE_NODE, a scalar type. */
441 extern tree gnat_unsigned_type
PARAMS ((tree
));
443 /* Return the signed version of a TYPE_NODE, a scalar type. */
444 extern tree gnat_signed_type
PARAMS ((tree
));
446 /* Return a type the same as TYPE except unsigned or signed according to
448 extern tree gnat_signed_or_unsigned_type
PARAMS ((int, tree
));
450 /* Create an expression whose value is that of EXPR,
451 converted to type TYPE. The TREE_TYPE of the value
452 is always TYPE. This function implements all reasonable
453 conversions; callers should filter out those that are
454 not permitted by the language being compiled. */
455 extern tree convert
PARAMS ((tree
, tree
));
457 /* Routines created solely for the tree translator's sake. Their prototypes
458 can be changed as desired. */
460 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
461 GNU_DECL is the GCC tree which is to be associated with
462 GNAT_ENTITY. Such gnu tree node is always an ..._DECL node.
463 If NO_CHECK is nonzero, the latter check is suppressed.
464 If GNU_DECL is zero, a previous association is to be reset. */
465 extern void save_gnu_tree
PARAMS ((Entity_Id
, tree
, int));
467 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
468 Return the ..._DECL node that was associated with it. If there is no tree
469 node associated with GNAT_ENTITY, abort. */
470 extern tree get_gnu_tree
PARAMS ((Entity_Id
));
472 /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */
473 extern int present_gnu_tree
PARAMS ((Entity_Id
));
475 /* Initialize tables for above routines. */
476 extern void init_gnat_to_gnu
PARAMS ((void));
478 /* Given a record type (RECORD_TYPE) and a chain of FIELD_DECL
479 nodes (FIELDLIST), finish constructing the record or union type.
480 If HAS_REP is nonzero, this record has a rep clause; don't call
481 layout_type but merely set the size and alignment ourselves.
482 If DEFER_DEBUG is nonzero, do not call the debugging routines
483 on this type; it will be done later. */
484 extern void finish_record_type
PARAMS ((tree
, tree
, int, int));
486 /* Returns a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the
487 subprogram. If it is void_type_node, then we are dealing with a procedure,
488 otherwise we are dealing with a function. PARAM_DECL_LIST is a list of
489 PARM_DECL nodes that are the subprogram arguments. CICO_LIST is the
490 copy-in/copy-out list to be stored into TYPE_CI_CO_LIST.
491 RETURNS_UNCONSTRAINED is nonzero if the function returns an unconstrained
492 object. RETURNS_BY_REF is nonzero if the function returns by reference.
493 RETURNS_WITH_DSP is nonzero if the function is to return with a
494 depressed stack pointer. */
495 extern tree create_subprog_type
PARAMS ((tree
, tree
, tree
, int, int,
498 /* Return a copy of TYPE, but safe to modify in any way. */
499 extern tree copy_type
PARAMS ((tree
));
501 /* Return an INTEGER_TYPE of SIZETYPE with range MIN to MAX and whose
502 TYPE_INDEX_TYPE is INDEX. */
503 extern tree create_index_type
PARAMS ((tree
, tree
, tree
));
505 /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type (a character
506 string) and TYPE is a ..._TYPE node giving its data type.
507 ARTIFICIAL_P is nonzero if this is a declaration that was generated
508 by the compiler. DEBUG_INFO_P is nonzero if we need to write debugging
509 information about this type. */
510 extern tree create_type_decl
PARAMS ((tree
, tree
, struct attrib
*,
513 /* Returns a GCC VAR_DECL node. VAR_NAME gives the name of the variable.
514 ASM_NAME is its assembler name (if provided). TYPE is
515 its data type (a GCC ..._TYPE node). VAR_INIT is the GCC tree for an
516 optional initial expression; NULL_TREE if none.
518 CONST_FLAG is nonzero if this variable is constant.
520 PUBLIC_FLAG is nonzero if this definition is to be made visible outside of
521 the current compilation unit. This flag should be set when processing the
522 variable definitions in a package specification. EXTERN_FLAG is nonzero
523 when processing an external variable declaration (as opposed to a
524 definition: no storage is to be allocated for the variable here).
525 STATIC_FLAG is only relevant when not at top level. In that case
526 it indicates whether to always allocate storage to the variable. */
527 extern tree create_var_decl
PARAMS ((tree
, tree
, tree
, tree
, int,
531 /* Given a DECL and ATTR_LIST, apply the listed attributes. */
532 extern void process_attributes
PARAMS ((tree
, struct attrib
*));
534 /* Obtain any pending elaborations and clear the old list. */
535 extern tree get_pending_elaborations
PARAMS ((void));
537 /* Return nonzero if there are pending elaborations. */
538 extern int pending_elaborations_p
PARAMS ((void));
540 /* Save a copy of the current pending elaboration list and make a new
542 extern void push_pending_elaborations
PARAMS ((void));
544 /* Pop the stack of pending elaborations. */
545 extern void pop_pending_elaborations
PARAMS ((void));
547 /* Return the current position in pending_elaborations so we can insert
548 elaborations after that point. */
549 extern tree get_elaboration_location
PARAMS ((void));
551 /* Insert the current elaborations after ELAB, which is in some elaboration
553 extern void insert_elaboration_list
PARAMS ((tree
));
555 /* Add some pending elaborations to the current list. */
556 extern void add_pending_elaborations
PARAMS ((tree
, tree
));
558 /* Returns a FIELD_DECL node. FIELD_NAME the field name, FIELD_TYPE is its
559 type, and RECORD_TYPE is the type of the parent. PACKED is nonzero if
560 this field is in a record type with a "pragma pack". If SIZE is nonzero
561 it is the specified size for this field. If POS is nonzero, it is the bit
562 position. If ADDRESSABLE is nonzero, it means we are allowed to take
563 the address of this field for aliasing purposes. */
564 extern tree create_field_decl
PARAMS ((tree
, tree
, tree
, int,
567 /* Returns a PARM_DECL node. PARAM_NAME is the name of the parameter,
568 PARAM_TYPE is its type. READONLY is nonzero if the parameter is
569 readonly (either an IN parameter or an address of a pass-by-ref
571 extern tree create_param_decl
PARAMS ((tree
, tree
, int));
573 /* Returns a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram,
574 ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE
575 node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of
576 PARM_DECL nodes chained through the TREE_CHAIN field).
578 INLINE_FLAG, PUBLIC_FLAG, and EXTERN_FLAG are used to set the appropriate
579 fields in the FUNCTION_DECL. */
580 extern tree create_subprog_decl
PARAMS ((tree
, tree
, tree
, tree
, int,
581 int, int, struct attrib
*));
583 /* Returns a LABEL_DECL node for LABEL_NAME. */
584 extern tree create_label_decl
PARAMS ((tree
));
586 /* Set up the framework for generating code for SUBPROG_DECL, a subprogram
587 body. This routine needs to be invoked before processing the declarations
588 appearing in the subprogram. */
589 extern void begin_subprog_body
PARAMS ((tree
));
591 /* Finish the definition of the current subprogram and compile it all the way
592 to assembler language output. */
593 extern void end_subprog_body
PARAMS ((void));
595 /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE.
596 EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs.
597 Return a constructor for the template. */
598 extern tree build_template
PARAMS ((tree
, tree
, tree
));
600 /* Build a VMS descriptor from a Mechanism_Type, which must specify
601 a descriptor type, and the GCC type of an object. Each FIELD_DECL
602 in the type contains in its DECL_INITIAL the expression to use when
603 a constructor is made for the type. GNAT_ENTITY is a gnat node used
604 to print out an error message if the mechanism cannot be applied to
605 an object of that type and also for the name. */
607 extern tree build_vms_descriptor
PARAMS ((tree
, Mechanism_Type
,
610 /* Build a type to be used to represent an aliased object whose nominal
611 type is an unconstrained array. This consists of a RECORD_TYPE containing
612 a field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an
613 ARRAY_TYPE. If ARRAY_TYPE is that of the unconstrained array, this
614 is used to represent an arbitrary unconstrained object. Use NAME
615 as the name of the record. */
616 extern tree build_unc_object_type
PARAMS ((tree
, tree
, tree
));
618 /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. In
619 the normal case this is just two adjustments, but we have more to do
620 if NEW is an UNCONSTRAINED_ARRAY_TYPE. */
621 extern void update_pointer_to
PARAMS ((tree
, tree
));
623 /* EXP is an expression for the size of an object. If this size contains
624 discriminant references, replace them with the maximum (if MAX_P) or
625 minimum (if ! MAX_P) possible value of the discriminant. */
626 extern tree max_size
PARAMS ((tree
, int));
628 /* Remove all conversions that are done in EXP. This includes converting
629 from a padded type or to a left-justified modular type. If TRUE_ADDRESS
630 is nonzero, always return the address of the containing object even if
631 the address is not bit-aligned. */
632 extern tree remove_conversions
PARAMS ((tree
, int));
634 /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that
635 refers to the underlying array. If its type has TYPE_CONTAINS_TEMPLATE_P,
636 likewise return an expression pointing to the underlying array. */
637 extern tree maybe_unconstrained_array
PARAMS ((tree
));
639 /* Return an expression that does an unchecked converstion of EXPR to TYPE.
640 If NOTRUNC_P is set, truncation operations should be suppressed. */
641 extern tree unchecked_convert
PARAMS ((tree
, tree
, int));
643 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
646 This preparation consists of taking the ordinary
647 representation of an expression expr and producing a valid tree
648 boolean expression describing whether expr is nonzero. We could
649 simply always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
650 but we optimize comparisons, &&, ||, and !.
652 The resulting type should always be the same as the input type.
653 This function is simpler than the corresponding C version since
654 the only possible operands will be things of Boolean type. */
655 extern tree gnat_truthvalue_conversion
PARAMS((tree
));
657 /* Return the base type of TYPE. */
658 extern tree get_base_type
PARAMS((tree
));
660 /* Likewise, but only return types known at Ada source. */
661 extern tree get_ada_base_type
PARAMS((tree
));
663 /* EXP is a GCC tree representing an address. See if we can find how
664 strictly the object at that address is aligned. Return that alignment
665 strictly the object at that address is aligned. Return that alignment
666 in bits. If we don't know anything about the alignment, return 0. */
667 extern unsigned int known_alignment
PARAMS((tree
));
669 /* Make a binary operation of kind OP_CODE. RESULT_TYPE is the type
670 desired for the result. Usually the operation is to be performed
671 in that type. For MODIFY_EXPR and ARRAY_REF, RESULT_TYPE may be 0
672 in which case the type to be used will be derived from the operands. */
673 extern tree build_binary_op
PARAMS((enum tree_code
, tree
, tree
, tree
));
675 /* Similar, but make unary operation. */
676 extern tree build_unary_op
PARAMS((enum tree_code
, tree
, tree
));
678 /* Similar, but for COND_EXPR. */
679 extern tree build_cond_expr
PARAMS((tree
, tree
, tree
, tree
));
681 /* Build a CALL_EXPR to call FUNDECL with one argument, ARG. Return
683 extern tree build_call_1_expr
PARAMS((tree
, tree
));
685 /* Build a CALL_EXPR to call FUNDECL with two argument, ARG1 & ARG2. Return
687 extern tree build_call_2_expr
PARAMS((tree
, tree
, tree
));
689 /* Likewise to call FUNDECL with no arguments. */
690 extern tree build_call_0_expr
PARAMS((tree
));
692 /* Call a function that raises an exception and pass the line number and file
693 name, if requested. MSG says which exception function to call. */
694 extern tree build_call_raise
PARAMS((int));
696 /* Return a CONSTRUCTOR of TYPE whose list is LIST. This is not the
697 same as build_constructor in the language-independent tree.c. */
698 extern tree gnat_build_constructor
PARAMS((tree
, tree
));
700 /* Return a COMPONENT_REF to access a field that is given by COMPONENT,
701 an IDENTIFIER_NODE giving the name of the field, FIELD, a FIELD_DECL,
702 for the field, or both. */
703 extern tree build_component_ref
PARAMS((tree
, tree
, tree
));
705 /* Build a GCC tree to call an allocation or deallocation function.
706 If GNU_OBJ is nonzero, it is an object to deallocate. Otherwise,
707 genrate an allocator.
709 GNU_SIZE is the size of the object and ALIGN is the alignment.
710 GNAT_PROC, if present is a procedure to call and GNAT_POOL is the
711 storage pool to use. If not preset, malloc and free will be used. */
712 extern tree build_call_alloc_dealloc
PARAMS((tree
, tree
, int, Entity_Id
,
713 Entity_Id
, Node_Id
));
715 /* Build a GCC tree to correspond to allocating an object of TYPE whose
716 initial value if INIT, if INIT is nonzero. Convert the expression to
717 RESULT_TYPE, which must be some type of pointer. Return the tree.
718 GNAT_PROC and GNAT_POOL optionally give the procedure to call and
719 the storage pool to use. GNAT_NODE is used to provide an error
720 location for restriction violations messages. */
721 extern tree build_allocator
PARAMS((tree
, tree
, tree
, Entity_Id
,
722 Entity_Id
, Node_Id
));
724 /* Fill in a VMS descriptor for EXPR and return a constructor for it.
725 GNAT_FORMAL is how we find the descriptor record. */
727 extern tree fill_vms_descriptor
PARAMS((tree
, Entity_Id
));
729 /* Indicate that we need to make the address of EXPR_NODE and it therefore
730 should not be allocated in a register. Return true if successful. */
731 extern bool gnat_mark_addressable
PARAMS((tree
));
733 /* These functions return the basic data type sizes and related parameters
734 about the target machine. */
736 extern Pos get_target_bits_per_unit
PARAMS ((void));
737 extern Pos get_target_bits_per_word
PARAMS ((void));
738 extern Pos get_target_char_size
PARAMS ((void));
739 extern Pos get_target_wchar_t_size
PARAMS ((void));
740 extern Pos get_target_short_size
PARAMS ((void));
741 extern Pos get_target_int_size
PARAMS ((void));
742 extern Pos get_target_long_size
PARAMS ((void));
743 extern Pos get_target_long_long_size
PARAMS ((void));
744 extern Pos get_target_float_size
PARAMS ((void));
745 extern Pos get_target_double_size
PARAMS ((void));
746 extern Pos get_target_long_double_size
PARAMS ((void));
747 extern Pos get_target_pointer_size
PARAMS ((void));
748 extern Pos get_target_maximum_alignment
PARAMS ((void));
749 extern Boolean get_target_no_dollar_in_label
PARAMS ((void));
750 extern Nat get_float_words_be
PARAMS ((void));
751 extern Nat get_words_be
PARAMS ((void));
752 extern Nat get_bytes_be
PARAMS ((void));
753 extern Nat get_bits_be
PARAMS ((void));
754 extern Nat get_strict_alignment
PARAMS ((void));