1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
10 * Copyright (C) 1992-2002 Free Software Foundation, Inc. *
12 * GNAT is free software; you can redistribute it and/or modify it under *
13 * terms of the GNU General Public License as published by the Free Soft- *
14 * ware Foundation; either version 2, or (at your option) any later ver- *
15 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
16 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
18 * for more details. You should have received a copy of the GNU General *
19 * Public License distributed with GNAT; see file COPYING. If not, write *
20 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
21 * MA 02111-1307, USA. *
23 * As a special exception, if you link this file with other files to *
24 * produce an executable, this file does not by itself cause the resulting *
25 * executable to be covered by the GNU General Public License. This except- *
26 * ion does not however invalidate any other reasons why the executable *
27 * file might be covered by the GNU Public License. *
29 * GNAT was originally developed by the GNAT team at New York University. *
30 * It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). *
32 ****************************************************************************/
34 /* Declare all functions and types used by gigi. */
36 /* See if DECL has an RTL that is indirect via a pseudo-register or a
37 memory location and replace it with an indirect reference if so.
38 This improves the debugger's ability to display the value. */
39 extern void adjust_decl_rtl PARAMS ((tree));
41 /* Record the current code position in GNAT_NODE. */
42 extern void record_code_position PARAMS ((Node_Id));
44 /* Insert the code for GNAT_NODE at the position saved for that node. */
45 extern void insert_code_for PARAMS ((Node_Id));
47 /* Routine called by gcc for emitting a stack check. GNU_EXPR is the
48 expression that contains the last address on the stack to check. */
49 extern tree emit_stack_check PARAMS ((tree));
51 /* Make a TRANSFORM_EXPR to later expand GNAT_NODE into code. */
52 extern tree make_transform_expr PARAMS ((Node_Id));
54 /* Update the setjmp buffer BUF with the current stack pointer. We assume
55 here that a __builtin_setjmp was done to BUF. */
56 extern void update_setjmp_buf PARAMS ((tree));
58 /* GNU_TYPE is a type. Determine if it should be passed by reference by
60 extern int default_pass_by_ref PARAMS ((tree));
62 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type
63 if it should be passed by reference. */
64 extern int must_pass_by_ref PARAMS ((tree));
66 /* This function returns the version of GCC being used. Here it's GCC 3. */
67 extern int gcc_version PARAMS ((void));
69 /* Elaboration routines for the front end. */
70 extern void elab_all_gnat PARAMS ((void));
72 /* Initialize DUMMY_NODE_TABLE. */
73 extern void init_dummy_type PARAMS ((void));
75 /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada
76 entity, this routine returns the equivalent GCC tree for that entity
77 (an ..._DECL node) and associates the ..._DECL node with the input GNAT
80 If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its
81 initial value (in GCC tree form). This is optional for variables.
82 For renamed entities, GNU_EXPR gives the object being renamed.
84 DEFINITION is nonzero if this call is intended for a definition. This is
85 used for separate compilation where it necessary to know whether an
86 external declaration or a definition should be created if the GCC equivalent
87 was not created previously. The value of 1 is normally used for a non-zero
88 DEFINITION, but a value of 2 is used in special circumstances, defined in
90 extern tree gnat_to_gnu_entity PARAMS ((Entity_Id, tree, int));
92 /* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a
93 GCC type corresponding to that entity. GNAT_ENTITY is assumed to
94 refer to an Ada type. */
95 extern tree gnat_to_gnu_type PARAMS ((Entity_Id));
97 /* Given GNAT_ENTITY, elaborate all expressions that are required to
98 be elaborated at the point of its definition, but do nothing else. */
99 extern void elaborate_entity PARAMS ((Entity_Id));
101 /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark
102 any entities on its entity chain similarly. */
103 extern void mark_out_of_scope PARAMS ((Entity_Id));
105 /* Make a dummy type corresponding to GNAT_TYPE. */
106 extern tree make_dummy_type PARAMS ((Entity_Id));
108 /* Get the unpadded version of a GNAT type. */
109 extern tree get_unpadded_type PARAMS ((Entity_Id));
111 /* Called when we need to protect a variable object using a save_expr. */
112 extern tree maybe_variable PARAMS ((tree, Node_Id));
114 /* Create a record type that contains a field of TYPE with a starting bit
115 position so that it is aligned to ALIGN bits. */
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 and is SIZE bytes long. */
118 extern tree make_aligning_type PARAMS ((tree, int, tree));
120 /* Given a GNU tree and a GNAT list of choices, generate an expression to test
121 the value passed against the list of choices. */
122 extern tree choices_to_gnu PARAMS ((tree, Node_Id));
124 /* Given a type T, a FIELD_DECL F, and a replacement value R,
125 return a new type with all size expressions that contain F
126 updated by replacing F with R. This is identical to GCC's
127 substitute_in_type except that it knows about TYPE_INDEX_TYPE. */
128 extern tree gnat_substitute_in_type PARAMS ((tree, tree, tree));
130 /* Return the "RM size" of GNU_TYPE. This is the actual number of bits
131 needed to represent the object. */
132 extern tree rm_size PARAMS ((tree));
134 /* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a
135 string, return a new IDENTIFIER_NODE that is the concatenation of
136 the name in GNU_ID and SUFFIX. */
137 extern tree concat_id_with_name PARAMS ((tree, const char *));
139 /* Return the name to be used for GNAT_ENTITY. If a type, create a
140 fully-qualified name, possibly with type information encoding.
141 Otherwise, return the name. */
142 extern tree get_entity_name PARAMS ((Entity_Id));
144 /* Return a name for GNAT_ENTITY concatenated with two underscores and
146 extern tree create_concat_name PARAMS ((Entity_Id, const char *));
148 /* Flag indicating whether file names are discarded in exception messages */
149 extern int discard_file_names;
151 /* If true, then gigi is being called on an analyzed but unexpanded
152 tree, and the only purpose of the call is to properly annotate
153 types with representation information */
154 extern int type_annotate_only;
156 /* Current file name without path */
157 extern const char *ref_filename;
159 /* List of TREE_LIST nodes representing a block stack. TREE_VALUE
160 of each gives the variable used for the setjmp buffer in the current
162 extern tree gnu_block_stack;
164 /* For most front-ends, this is the parser for the language. For us, we
165 process the GNAT tree. */
166 extern int yyparse PARAMS ((void));
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 lineno from the source location
200 (Sloc) of GNAT_NODE node. Set the global variable input_filename and
201 lineno. 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,
355 extern tree gnat_std_decls[(int) ADT_LAST];
356 extern tree gnat_raise_decls[(int) LAST_REASON_CODE + 1];
358 #define longest_float_type_node gnat_std_decls[(int) ADT_longest_float_type]
359 #define void_type_decl_node gnat_std_decls[(int) ADT_void_type_decl]
360 #define except_type_node gnat_std_decls[(int) ADT_except_type]
361 #define ptr_void_type_node gnat_std_decls[(int) ADT_ptr_void_type]
362 #define void_ftype gnat_std_decls[(int) ADT_void_ftype]
363 #define ptr_void_ftype gnat_std_decls[(int) ADT_ptr_void_ftype]
364 #define malloc_decl gnat_std_decls[(int) ADT_malloc_decl]
365 #define free_decl gnat_std_decls[(int) ADT_free_decl]
366 #define jmpbuf_type gnat_std_decls[(int) ADT_jmpbuf_type]
367 #define jmpbuf_ptr_type gnat_std_decls[(int) ADT_jmpbuf_ptr_type]
368 #define get_jmpbuf_decl gnat_std_decls[(int) ADT_get_jmpbuf_decl]
369 #define set_jmpbuf_decl gnat_std_decls[(int) ADT_set_jmpbuf_decl]
370 #define get_excptr_decl gnat_std_decls[(int) ADT_get_excptr_decl]
371 #define setjmp_decl gnat_std_decls[(int) ADT_setjmp_decl]
372 #define longjmp_decl gnat_std_decls[(int) ADT_longjmp_decl]
373 #define raise_nodefer_decl gnat_std_decls[(int) ADT_raise_nodefer_decl]
375 /* Routines expected by the gcc back-end. They must have exactly the same
376 prototype and names as below. */
378 /* Returns non-zero if we are currently in the global binding level */
379 extern int global_bindings_p PARAMS ((void));
381 /* Returns the list of declarations in the current level. Note that this list
382 is in reverse order (it has to be so for back-end compatibility). */
383 extern tree getdecls PARAMS ((void));
385 /* Nonzero if the current level needs to have a BLOCK made. */
386 extern int kept_level_p PARAMS ((void));
388 /* Enter a new binding level. The input parameter is ignored, but has to be
389 specified for back-end compatibility. */
390 extern void pushlevel PARAMS ((int));
392 /* Exit a binding level.
393 Pop the level off, and restore the state of the identifier-decl mappings
394 that were in effect when this level was entered.
396 If KEEP is nonzero, this level had explicit declarations, so
397 and create a "block" (a BLOCK node) for the level
398 to record its declarations and subblocks for symbol table output.
400 If FUNCTIONBODY is nonzero, this level is the body of a function,
401 so create a block as if KEEP were set and also clear out all
404 If REVERSE is nonzero, reverse the order of decls before putting
405 them into the BLOCK. */
406 extern tree poplevel PARAMS ((int,int, int));
408 /* Insert BLOCK at the end of the list of subblocks of the
409 current binding level. This is used when a BIND_EXPR is expanded,
410 to handle the BLOCK node inside the BIND_EXPR. */
411 extern void insert_block PARAMS ((tree));
413 /* Set the BLOCK node for the innermost scope
414 (the one we are currently in). */
415 extern void set_block PARAMS ((tree));
417 /* Records a ..._DECL node DECL as belonging to the current lexical scope.
418 Returns the ..._DECL node. */
419 extern tree pushdecl PARAMS ((tree));
421 /* Create the predefined scalar types such as `integer_type_node' needed
422 in the gcc back-end and initialize the global binding level. */
423 extern void gnat_init_decl_processing PARAMS ((void));
424 extern void init_gigi_decls PARAMS ((tree, tree));
425 extern void gnat_init_gcc_eh PARAMS ((void));
427 /* Return an integer type with the number of bits of precision given by
428 PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise
429 it is a signed type. */
430 extern tree type_for_size PARAMS ((unsigned, int));
432 /* Return a data type that has machine mode MODE. UNSIGNEDP selects
433 an unsigned type; otherwise a signed type is returned. */
434 extern tree type_for_mode PARAMS ((enum machine_mode, int));
436 /* Return the unsigned version of a TYPE_NODE, a scalar type. */
437 extern tree unsigned_type PARAMS ((tree));
439 /* Return the signed version of a TYPE_NODE, a scalar type. */
440 extern tree signed_type PARAMS ((tree));
442 /* Return a type the same as TYPE except unsigned or signed according to
444 extern tree signed_or_unsigned_type PARAMS ((int, tree));
446 /* This routine is called in tree.c to print an error message for invalid use
447 of an incomplete type. */
448 extern void incomplete_type_error PARAMS ((tree, tree));
450 /* This function is called indirectly from toplev.c to handle incomplete
451 declarations, i.e. VAR_DECL nodes whose DECL_SIZE is zero. To be precise,
452 compile_file in toplev.c makes an indirect call through the function pointer
453 incomplete_decl_finalize_hook which is initialized to this routine in
454 init_decl_processing. */
455 extern void finish_incomplete_decl PARAMS ((tree));
457 /* Create an expression whose value is that of EXPR,
458 converted to type TYPE. The TREE_TYPE of the value
459 is always TYPE. This function implements all reasonable
460 conversions; callers should filter out those that are
461 not permitted by the language being compiled. */
462 extern tree convert PARAMS ((tree, tree));
464 /* Routines created solely for the tree translator's sake. Their prototypes
465 can be changed as desired. */
467 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
468 GNU_DECL is the GCC tree which is to be associated with
469 GNAT_ENTITY. Such gnu tree node is always an ..._DECL node.
470 If NO_CHECK is nonzero, the latter check is suppressed.
471 If GNU_DECL is zero, a previous association is to be reset. */
472 extern void save_gnu_tree PARAMS ((Entity_Id, tree, int));
474 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
475 Return the ..._DECL node that was associated with it. If there is no tree
476 node associated with GNAT_ENTITY, abort. */
477 extern tree get_gnu_tree PARAMS ((Entity_Id));
479 /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */
480 extern int present_gnu_tree PARAMS ((Entity_Id));
482 /* Initialize tables for above routines. */
483 extern void init_gnat_to_gnu PARAMS ((void));
485 /* Given a record type (RECORD_TYPE) and a chain of FIELD_DECL
486 nodes (FIELDLIST), finish constructing the record or union type.
487 If HAS_REP is nonzero, this record has a rep clause; don't call
488 layout_type but merely set the size and alignment ourselves.
489 If DEFER_DEBUG is nonzero, do not call the debugging routines
490 on this type; it will be done later. */
491 extern void finish_record_type PARAMS ((tree, tree, int, int));
493 /* Returns a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the
494 subprogram. If it is void_type_node, then we are dealing with a procedure,
495 otherwise we are dealing with a function. PARAM_DECL_LIST is a list of
496 PARM_DECL nodes that are the subprogram arguments. CICO_LIST is the
497 copy-in/copy-out list to be stored into TYPE_CI_CO_LIST.
498 RETURNS_UNCONSTRAINED is nonzero if the function returns an unconstrained
499 object. RETURNS_BY_REF is nonzero if the function returns by reference.
500 RETURNS_WITH_DSP is nonzero if the function is to return with a
501 depressed stack pointer. */
502 extern tree create_subprog_type PARAMS ((tree, tree, tree, int, int,
505 /* Return a copy of TYPE, but safe to modify in any way. */
506 extern tree copy_type PARAMS ((tree));
508 /* Return an INTEGER_TYPE of SIZETYPE with range MIN to MAX and whose
509 TYPE_INDEX_TYPE is INDEX. */
510 extern tree create_index_type PARAMS ((tree, tree, tree));
512 /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type (a character
513 string) and TYPE is a ..._TYPE node giving its data type.
514 ARTIFICIAL_P is nonzero if this is a declaration that was generated
515 by the compiler. DEBUG_INFO_P is nonzero if we need to write debugging
516 information about this type. */
517 extern tree create_type_decl PARAMS ((tree, tree, struct attrib *,
520 /* Returns a GCC VAR_DECL node. VAR_NAME gives the name of the variable.
521 ASM_NAME is its assembler name (if provided). TYPE is
522 its data type (a GCC ..._TYPE node). VAR_INIT is the GCC tree for an
523 optional initial expression; NULL_TREE if none.
525 CONST_FLAG is nonzero if this variable is constant.
527 PUBLIC_FLAG is nonzero if this definition is to be made visible outside of
528 the current compilation unit. This flag should be set when processing the
529 variable definitions in a package specification. EXTERN_FLAG is nonzero
530 when processing an external variable declaration (as opposed to a
531 definition: no storage is to be allocated for the variable here).
532 STATIC_FLAG is only relevant when not at top level. In that case
533 it indicates whether to always allocate storage to the variable. */
534 extern tree create_var_decl PARAMS ((tree, tree, tree, tree, int,
538 /* Given a DECL and ATTR_LIST, apply the listed attributes. */
539 extern void process_attributes PARAMS ((tree, struct attrib *));
541 /* Obtain any pending elaborations and clear the old list. */
542 extern tree get_pending_elaborations PARAMS ((void));
544 /* Return nonzero if there are pending elaborations. */
545 extern int pending_elaborations_p PARAMS ((void));
547 /* Save a copy of the current pending elaboration list and make a new
549 extern void push_pending_elaborations PARAMS ((void));
551 /* Pop the stack of pending elaborations. */
552 extern void pop_pending_elaborations PARAMS ((void));
554 /* Return the current position in pending_elaborations so we can insert
555 elaborations after that point. */
556 extern tree get_elaboration_location PARAMS ((void));
558 /* Insert the current elaborations after ELAB, which is in some elaboration
560 extern void insert_elaboration_list PARAMS ((tree));
562 /* Add some pending elaborations to the current list. */
563 extern void add_pending_elaborations PARAMS ((tree, tree));
565 /* Returns a FIELD_DECL node. FIELD_NAME the field name, FIELD_TYPE is its
566 type, and RECORD_TYPE is the type of the parent. PACKED is nonzero if
567 this field is in a record type with a "pragma pack". If SIZE is nonzero
568 it is the specified size for this field. If POS is nonzero, it is the bit
569 position. If ADDRESSABLE is nonzero, it means we are allowed to take
570 the address of this field for aliasing purposes. */
571 extern tree create_field_decl PARAMS ((tree, tree, tree, int,
574 /* Returns a PARM_DECL node. PARAM_NAME is the name of the parameter,
575 PARAM_TYPE is its type. READONLY is nonzero if the parameter is
576 readonly (either an IN parameter or an address of a pass-by-ref
578 extern tree create_param_decl PARAMS ((tree, tree, int));
580 /* Returns a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram,
581 ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE
582 node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of
583 PARM_DECL nodes chained through the TREE_CHAIN field).
585 INLINE_FLAG, PUBLIC_FLAG, and EXTERN_FLAG are used to set the appropriate
586 fields in the FUNCTION_DECL. */
587 extern tree create_subprog_decl PARAMS ((tree, tree, tree, tree, int,
588 int, int, struct attrib *));
590 /* Returns a LABEL_DECL node for LABEL_NAME. */
591 extern tree create_label_decl PARAMS ((tree));
593 /* Set up the framework for generating code for SUBPROG_DECL, a subprogram
594 body. This routine needs to be invoked before processing the declarations
595 appearing in the subprogram. */
596 extern void begin_subprog_body PARAMS ((tree));
598 /* Finish the definition of the current subprogram and compile it all the way
599 to assembler language output. */
600 extern void end_subprog_body PARAMS ((void));
602 /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE.
603 EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs.
604 Return a constructor for the template. */
605 extern tree build_template PARAMS ((tree, tree, tree));
607 /* Build a VMS descriptor from a Mechanism_Type, which must specify
608 a descriptor type, and the GCC type of an object. Each FIELD_DECL
609 in the type contains in its DECL_INITIAL the expression to use when
610 a constructor is made for the type. GNAT_ENTITY is a gnat node used
611 to print out an error message if the mechanism cannot be applied to
612 an object of that type and also for the name. */
614 extern tree build_vms_descriptor PARAMS ((tree, Mechanism_Type,
617 /* Build a type to be used to represent an aliased object whose nominal
618 type is an unconstrained array. This consists of a RECORD_TYPE containing
619 a field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an
620 ARRAY_TYPE. If ARRAY_TYPE is that of the unconstrained array, this
621 is used to represent an arbitrary unconstrained object. Use NAME
622 as the name of the record. */
623 extern tree build_unc_object_type PARAMS ((tree, tree, tree));
625 /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. In
626 the normal case this is just two adjustments, but we have more to do
627 if NEW is an UNCONSTRAINED_ARRAY_TYPE. */
628 extern void update_pointer_to PARAMS ((tree, tree));
630 /* EXP is an expression for the size of an object. If this size contains
631 discriminant references, replace them with the maximum (if MAX_P) or
632 minimum (if ! MAX_P) possible value of the discriminant. */
633 extern tree max_size PARAMS ((tree, int));
635 /* Remove all conversions that are done in EXP. This includes converting
636 from a padded type or to a left-justified modular type. If TRUE_ADDRESS
637 is nonzero, always return the address of the containing object even if
638 the address is not bit-aligned. */
639 extern tree remove_conversions PARAMS ((tree, int));
641 /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that
642 refers to the underlying array. If its type has TYPE_CONTAINS_TEMPLATE_P,
643 likewise return an expression pointing to the underlying array. */
644 extern tree maybe_unconstrained_array PARAMS ((tree));
646 /* Return an expression that does an unchecked converstion of EXPR to TYPE. */
647 extern tree unchecked_convert PARAMS ((tree, tree));
649 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
652 This preparation consists of taking the ordinary
653 representation of an expression expr and producing a valid tree
654 boolean expression describing whether expr is nonzero. We could
655 simply always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
656 but we optimize comparisons, &&, ||, and !.
658 The resulting type should always be the same as the input type.
659 This function is simpler than the corresponding C version since
660 the only possible operands will be things of Boolean type. */
661 extern tree truthvalue_conversion PARAMS((tree));
663 /* Return the base type of TYPE. */
664 extern tree get_base_type PARAMS((tree));
666 /* Likewise, but only return types known at Ada source. */
667 extern tree get_ada_base_type PARAMS((tree));
669 /* EXP is a GCC tree representing an address. See if we can find how
670 strictly the object at that address is aligned. Return that alignment
671 strictly the object at that address is aligned. Return that alignment
672 in bits. If we don't know anything about the alignment, return 0. */
673 extern unsigned int known_alignment PARAMS((tree));
675 /* Make a binary operation of kind OP_CODE. RESULT_TYPE is the type
676 desired for the result. Usually the operation is to be performed
677 in that type. For MODIFY_EXPR and ARRAY_REF, RESULT_TYPE may be 0
678 in which case the type to be used will be derived from the operands. */
679 extern tree build_binary_op PARAMS((enum tree_code, tree, tree, tree));
681 /* Similar, but make unary operation. */
682 extern tree build_unary_op PARAMS((enum tree_code, tree, tree));
684 /* Similar, but for COND_EXPR. */
685 extern tree build_cond_expr PARAMS((tree, tree, tree, tree));
687 /* Build a CALL_EXPR to call FUNDECL with one argument, ARG. Return
689 extern tree build_call_1_expr PARAMS((tree, tree));
691 /* Build a CALL_EXPR to call FUNDECL with two argument, ARG1 & ARG2. Return
693 extern tree build_call_2_expr PARAMS((tree, tree, tree));
695 /* Likewise to call FUNDECL with no arguments. */
696 extern tree build_call_0_expr PARAMS((tree));
698 /* Call a function that raises an exception and pass the line number and file
699 name, if requested. MSG says which exception function to call. */
700 extern tree build_call_raise PARAMS((int));
702 /* Return a CONSTRUCTOR of TYPE whose list is LIST. */
703 extern tree build_constructor PARAMS((tree, tree));
705 /* Return a COMPONENT_REF to access a field that is given by COMPONENT,
706 an IDENTIFIER_NODE giving the name of the field, FIELD, a FIELD_DECL,
707 for the field, or both. */
708 extern tree build_component_ref PARAMS((tree, tree, tree));
710 /* Build a GCC tree to call an allocation or deallocation function.
711 If GNU_OBJ is nonzero, it is an object to deallocate. Otherwise,
712 genrate an allocator.
714 GNU_SIZE is the size of the object and ALIGN is the alignment.
715 GNAT_PROC, if present is a procedure to call and GNAT_POOL is the
716 storage pool to use. If not preset, malloc and free will be used. */
717 extern tree build_call_alloc_dealloc PARAMS((tree, tree, int, Entity_Id,
720 /* Build a GCC tree to correspond to allocating an object of TYPE whose
721 initial value if INIT, if INIT is nonzero. Convert the expression to
722 RESULT_TYPE, which must be some type of pointer. Return the tree.
723 GNAT_PROC and GNAT_POOL optionally give the procedure to call and
724 the storage pool to use. */
725 extern tree build_allocator PARAMS((tree, tree, tree, Entity_Id,
728 /* Fill in a VMS descriptor for EXPR and return a constructor for it.
729 GNAT_FORMAL is how we find the descriptor record. */
731 extern tree fill_vms_descriptor PARAMS((tree, Entity_Id));
733 /* Indicate that we need to make the address of EXPR_NODE and it therefore
734 should not be allocated in a register. Return 1 if successful. */
735 extern int mark_addressable PARAMS((tree));
737 /* These functions return the basic data type sizes and related parameters
738 about the target machine. */
740 extern Pos get_target_bits_per_unit PARAMS ((void));
741 extern Pos get_target_bits_per_word PARAMS ((void));
742 extern Pos get_target_char_size PARAMS ((void));
743 extern Pos get_target_wchar_t_size PARAMS ((void));
744 extern Pos get_target_short_size PARAMS ((void));
745 extern Pos get_target_int_size PARAMS ((void));
746 extern Pos get_target_long_size PARAMS ((void));
747 extern Pos get_target_long_long_size PARAMS ((void));
748 extern Pos get_target_float_size PARAMS ((void));
749 extern Pos get_target_double_size PARAMS ((void));
750 extern Pos get_target_long_double_size PARAMS ((void));
751 extern Pos get_target_pointer_size PARAMS ((void));
752 extern Pos get_target_maximum_alignment PARAMS ((void));
753 extern Boolean get_target_no_dollar_in_label PARAMS ((void));
754 extern Nat get_float_words_be PARAMS ((void));
755 extern Nat get_words_be PARAMS ((void));
756 extern Nat get_bytes_be PARAMS ((void));
757 extern Nat get_bits_be PARAMS ((void));
758 extern Nat get_strict_alignment PARAMS ((void));