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update copyrights in config dir.
[official-gcc.git] / gcc / c-parse.y
blob44fe723dafb8295ed57a82bb4aa8e9b842e4a328
1 /*WARNING: This file is automatically generated!*/
2 /* YACC parser for C syntax and for Objective C. -*-c-*-
3 Copyright (C) 1987, 88, 89, 92-99, 2000 Free Software Foundation, Inc.
4
5 This file is part of GNU CC.
6
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22 /* This file defines the grammar of C and that of Objective C.
23 ifobjc ... end ifobjc conditionals contain code for Objective C only.
24 ifc ... end ifc conditionals contain code for C only.
25 Sed commands in Makefile.in are used to convert this file into
26 c-parse.y and into objc-parse.y. */
27
28 /* To whomever it may concern: I have heard that such a thing was once
29 written by AT&T, but I have never seen it. */
30
31 %expect 53
32
33 %{
34 #include "config.h"
35 #include "system.h"
36 #include <setjmp.h>
37 #include "tree.h"
38 #include "input.h"
39 #include "c-lex.h"
40 #include "c-tree.h"
41 #include "flags.h"
42 #include "output.h"
43 #include "toplev.h"
44 #include "ggc.h"
45
46 #ifdef MULTIBYTE_CHARS
47 #include <locale.h>
48 #endif
49
50
51 /* Since parsers are distinct for each language, put the language string
52 definition here. */
53 const char * const language_string = "GNU C";
54
55 /* Like YYERROR but do call yyerror. */
56 #define YYERROR1 { yyerror ("syntax error"); YYERROR; }
57
58 /* Cause the `yydebug' variable to be defined. */
59 #define YYDEBUG 1
60 %}
61
62 %start program
63
64 %union {long itype; tree ttype; enum tree_code code;
65 char *filename; int lineno; int ends_in_label; }
66
67 /* All identifiers that are not reserved words
68 and are not declared typedefs in the current block */
69 %token IDENTIFIER
70
71 /* All identifiers that are declared typedefs in the current block.
72 In some contexts, they are treated just like IDENTIFIER,
73 but they can also serve as typespecs in declarations. */
74 %token TYPENAME
75
76 /* Reserved words that specify storage class.
77 yylval contains an IDENTIFIER_NODE which indicates which one. */
78 %token SCSPEC
79
80 /* Reserved words that specify type.
81 yylval contains an IDENTIFIER_NODE which indicates which one. */
82 %token TYPESPEC
83
84 /* Reserved words that qualify type: "const", "volatile", or "restrict".
85 yylval contains an IDENTIFIER_NODE which indicates which one. */
86 %token TYPE_QUAL
87
88 /* Character or numeric constants.
89 yylval is the node for the constant. */
90 %token CONSTANT
91
92 /* String constants in raw form.
93 yylval is a STRING_CST node. */
94 %token STRING
95
96 /* "...", used for functions with variable arglists. */
97 %token ELLIPSIS
98
99 /* the reserved words */
100 /* SCO include files test "ASM", so use something else. */
101 %token SIZEOF ENUM STRUCT UNION IF ELSE WHILE DO FOR SWITCH CASE DEFAULT
102 %token BREAK CONTINUE RETURN GOTO ASM_KEYWORD TYPEOF ALIGNOF
103 %token ATTRIBUTE EXTENSION LABEL
104 %token REALPART IMAGPART VA_ARG
105
106 /* Used in c-lex.c for parsing pragmas. */
107 %token END_OF_LINE
108
109 /* Add precedence rules to solve dangling else s/r conflict */
110 %nonassoc IF
111 %nonassoc ELSE
112
113 /* Define the operator tokens and their precedences.
114 The value is an integer because, if used, it is the tree code
115 to use in the expression made from the operator. */
116
117 %right <code> ASSIGN '='
118 %right <code> '?' ':'
119 %left <code> OROR
120 %left <code> ANDAND
121 %left <code> '|'
122 %left <code> '^'
123 %left <code> '&'
124 %left <code> EQCOMPARE
125 %left <code> ARITHCOMPARE
126 %left <code> LSHIFT RSHIFT
127 %left <code> '+' '-'
128 %left <code> '*' '/' '%'
129 %right <code> UNARY PLUSPLUS MINUSMINUS
130 %left HYPERUNARY
131 %left <code> POINTSAT '.' '(' '['
132
133 /* The Objective-C keywords. These are included in C and in
134 Objective C, so that the token codes are the same in both. */
135 %token INTERFACE IMPLEMENTATION END SELECTOR DEFS ENCODE
136 %token CLASSNAME PUBLIC PRIVATE PROTECTED PROTOCOL OBJECTNAME CLASS ALIAS
137
138 /* Objective-C string constants in raw form.
139 yylval is an OBJC_STRING_CST node. */
140 %token OBJC_STRING
141
142
143 %type <code> unop
144
145 %type <ttype> identifier IDENTIFIER TYPENAME CONSTANT expr nonnull_exprlist exprlist
146 %type <ttype> expr_no_commas cast_expr unary_expr primary string STRING
147 %type <ttype> typed_declspecs reserved_declspecs
148 %type <ttype> typed_typespecs reserved_typespecquals
149 %type <ttype> declmods typespec typespecqual_reserved
150 %type <ttype> typed_declspecs_no_prefix_attr reserved_declspecs_no_prefix_attr
151 %type <ttype> declmods_no_prefix_attr
152 %type <ttype> SCSPEC TYPESPEC TYPE_QUAL nonempty_type_quals maybe_type_qual
153 %type <ttype> initdecls notype_initdecls initdcl notype_initdcl
154 %type <ttype> init maybeasm
155 %type <ttype> asm_operands nonnull_asm_operands asm_operand asm_clobbers
156 %type <ttype> maybe_attribute attributes attribute attribute_list attrib
157 %type <ttype> any_word extension
158
159 %type <ttype> compstmt compstmt_nostart compstmt_primary_start
160
161 %type <ttype> declarator
162 %type <ttype> notype_declarator after_type_declarator
163 %type <ttype> parm_declarator
164
165 %type <ttype> structsp component_decl_list component_decl_list2
166 %type <ttype> component_decl components component_declarator
167 %type <ttype> enumlist enumerator
168 %type <ttype> struct_head union_head enum_head
169 %type <ttype> typename absdcl absdcl1 type_quals
170 %type <ttype> xexpr parms parm identifiers
171
172 %type <ttype> parmlist parmlist_1 parmlist_2
173 %type <ttype> parmlist_or_identifiers parmlist_or_identifiers_1
174 %type <ttype> identifiers_or_typenames
175
176 %type <itype> setspecs
177
178 %type <ends_in_label> lineno_stmt_or_label lineno_stmt_or_labels stmt_or_label
179
180 %type <filename> save_filename
181 %type <lineno> save_lineno
182 \f
183 \f
184 %{
185 /* Number of statements (loosely speaking) and compound statements
186 seen so far. */
187 static int stmt_count;
188 static int compstmt_count;
189
190 /* Input file and line number of the end of the body of last simple_if;
191 used by the stmt-rule immediately after simple_if returns. */
192 static char *if_stmt_file;
193 static int if_stmt_line;
194
195 /* List of types and structure classes of the current declaration. */
196 static tree current_declspecs = NULL_TREE;
197 static tree prefix_attributes = NULL_TREE;
198
199 /* Stack of saved values of current_declspecs and prefix_attributes. */
200 static tree declspec_stack;
201
202 /* 1 if we explained undeclared var errors. */
203 static int undeclared_variable_notice;
204
205 /* For __extension__, save/restore the warning flags which are
206 controlled by __extension__. */
207 #define SAVE_WARN_FLAGS() \
208 build_int_2 (pedantic | (warn_pointer_arith << 1), 0)
209 #define RESTORE_WARN_FLAGS(tval) \
210 do { \
211 int val = TREE_INT_CST_LOW (tval); \
212 pedantic = val & 1; \
213 warn_pointer_arith = (val >> 1) & 1; \
214 } while (0)
215
216
217 /* Tell yyparse how to print a token's value, if yydebug is set. */
218
219 #define YYPRINT(FILE,YYCHAR,YYLVAL) yyprint(FILE,YYCHAR,YYLVAL)
220 extern void yyprint PARAMS ((FILE *, int, YYSTYPE));
221
222 /* Add GC roots for variables local to this file. */
223 void
224 c_parse_init ()
225 {
226 ggc_add_tree_root (&declspec_stack, 1);
227 ggc_add_tree_root (&current_declspecs, 1);
228 ggc_add_tree_root (&prefix_attributes, 1);
229 }
230
231 %}
232 \f
233 %%
234 program: /* empty */
235 { if (pedantic)
236 pedwarn ("ANSI C forbids an empty source file");
237 finish_file ();
238 }
239 | extdefs
240 {
241 /* In case there were missing closebraces,
242 get us back to the global binding level. */
243 while (! global_bindings_p ())
244 poplevel (0, 0, 0);
245 finish_file ();
246 }
247 ;
248
249 /* the reason for the strange actions in this rule
250 is so that notype_initdecls when reached via datadef
251 can find a valid list of type and sc specs in $0. */
252
253 extdefs:
254 {$<ttype>$ = NULL_TREE; } extdef
255 | extdefs {$<ttype>$ = NULL_TREE; } extdef
256 ;
257
258 extdef:
259 fndef
260 | datadef
261 | ASM_KEYWORD '(' expr ')' ';'
262 { STRIP_NOPS ($3);
263 if ((TREE_CODE ($3) == ADDR_EXPR
264 && TREE_CODE (TREE_OPERAND ($3, 0)) == STRING_CST)
265 || TREE_CODE ($3) == STRING_CST)
266 assemble_asm ($3);
267 else
268 error ("argument of `asm' is not a constant string"); }
269 | extension extdef
270 { RESTORE_WARN_FLAGS ($1); }
271 ;
272
273 datadef:
274 setspecs notype_initdecls ';'
275 { if (pedantic)
276 error ("ANSI C forbids data definition with no type or storage class");
277 else if (!flag_traditional)
278 warning ("data definition has no type or storage class");
279
280 current_declspecs = TREE_VALUE (declspec_stack);
281 prefix_attributes = TREE_PURPOSE (declspec_stack);
282 declspec_stack = TREE_CHAIN (declspec_stack);
283 resume_momentary ($1); }
284 | declmods setspecs notype_initdecls ';'
285 { current_declspecs = TREE_VALUE (declspec_stack);
286 prefix_attributes = TREE_PURPOSE (declspec_stack);
287 declspec_stack = TREE_CHAIN (declspec_stack);
288 resume_momentary ($2); }
289 | typed_declspecs setspecs initdecls ';'
290 { current_declspecs = TREE_VALUE (declspec_stack);
291 prefix_attributes = TREE_PURPOSE (declspec_stack);
292 declspec_stack = TREE_CHAIN (declspec_stack);
293 resume_momentary ($2); }
294 | declmods ';'
295 { pedwarn ("empty declaration"); }
296 | typed_declspecs ';'
297 { shadow_tag ($1); }
298 | error ';'
299 | error '}'
300 | ';'
301 { if (pedantic)
302 pedwarn ("ANSI C does not allow extra `;' outside of a function"); }
303 ;
304 \f
305 fndef:
306 typed_declspecs setspecs declarator
307 { if (! start_function (current_declspecs, $3,
308 prefix_attributes, NULL_TREE, 0))
309 YYERROR1;
310 reinit_parse_for_function (); }
311 old_style_parm_decls
312 { store_parm_decls (); }
313 compstmt_or_error
314 { finish_function (0);
315 current_declspecs = TREE_VALUE (declspec_stack);
316 prefix_attributes = TREE_PURPOSE (declspec_stack);
317 declspec_stack = TREE_CHAIN (declspec_stack);
318 resume_momentary ($2); }
319 | typed_declspecs setspecs declarator error
320 { current_declspecs = TREE_VALUE (declspec_stack);
321 prefix_attributes = TREE_PURPOSE (declspec_stack);
322 declspec_stack = TREE_CHAIN (declspec_stack);
323 resume_momentary ($2); }
324 | declmods setspecs notype_declarator
325 { if (! start_function (current_declspecs, $3,
326 prefix_attributes, NULL_TREE, 0))
327 YYERROR1;
328 reinit_parse_for_function (); }
329 old_style_parm_decls
330 { store_parm_decls (); }
331 compstmt_or_error
332 { finish_function (0);
333 current_declspecs = TREE_VALUE (declspec_stack);
334 prefix_attributes = TREE_PURPOSE (declspec_stack);
335 declspec_stack = TREE_CHAIN (declspec_stack);
336 resume_momentary ($2); }
337 | declmods setspecs notype_declarator error
338 { current_declspecs = TREE_VALUE (declspec_stack);
339 prefix_attributes = TREE_PURPOSE (declspec_stack);
340 declspec_stack = TREE_CHAIN (declspec_stack);
341 resume_momentary ($2); }
342 | setspecs notype_declarator
343 { if (! start_function (NULL_TREE, $2,
344 prefix_attributes, NULL_TREE, 0))
345 YYERROR1;
346 reinit_parse_for_function (); }
347 old_style_parm_decls
348 { store_parm_decls (); }
349 compstmt_or_error
350 { finish_function (0);
351 current_declspecs = TREE_VALUE (declspec_stack);
352 prefix_attributes = TREE_PURPOSE (declspec_stack);
353 declspec_stack = TREE_CHAIN (declspec_stack);
354 resume_momentary ($1); }
355 | setspecs notype_declarator error
356 { current_declspecs = TREE_VALUE (declspec_stack);
357 prefix_attributes = TREE_PURPOSE (declspec_stack);
358 declspec_stack = TREE_CHAIN (declspec_stack);
359 resume_momentary ($1); }
360 ;
361
362 identifier:
363 IDENTIFIER
364 | TYPENAME
365 ;
366
367 unop: '&'
368 { $$ = ADDR_EXPR; }
369 | '-'
370 { $$ = NEGATE_EXPR; }
371 | '+'
372 { $$ = CONVERT_EXPR; }
373 | PLUSPLUS
374 { $$ = PREINCREMENT_EXPR; }
375 | MINUSMINUS
376 { $$ = PREDECREMENT_EXPR; }
377 | '~'
378 { $$ = BIT_NOT_EXPR; }
379 | '!'
380 { $$ = TRUTH_NOT_EXPR; }
381 ;
382
383 expr: nonnull_exprlist
384 { $$ = build_compound_expr ($1); }
385 ;
386
387 exprlist:
388 /* empty */
389 { $$ = NULL_TREE; }
390 | nonnull_exprlist
391 ;
392
393 nonnull_exprlist:
394 expr_no_commas
395 { $$ = build_tree_list (NULL_TREE, $1); }
396 | nonnull_exprlist ',' expr_no_commas
397 { chainon ($1, build_tree_list (NULL_TREE, $3)); }
398 ;
399
400 unary_expr:
401 primary
402 | '*' cast_expr %prec UNARY
403 { $$ = build_indirect_ref ($2, "unary *"); }
404 /* __extension__ turns off -pedantic for following primary. */
405 | extension cast_expr %prec UNARY
406 { $$ = $2;
407 RESTORE_WARN_FLAGS ($1); }
408 | unop cast_expr %prec UNARY
409 { $$ = build_unary_op ($1, $2, 0);
410 overflow_warning ($$); }
411 /* Refer to the address of a label as a pointer. */
412 | ANDAND identifier
413 { tree label = lookup_label ($2);
414 if (pedantic)
415 pedwarn ("ANSI C forbids `&&'");
416 if (label == 0)
417 $$ = null_pointer_node;
418 else
419 {
420 TREE_USED (label) = 1;
421 $$ = build1 (ADDR_EXPR, ptr_type_node, label);
422 TREE_CONSTANT ($$) = 1;
423 }
424 }
425 /* This seems to be impossible on some machines, so let's turn it off.
426 You can use __builtin_next_arg to find the anonymous stack args.
427 | '&' ELLIPSIS
428 { tree types = TYPE_ARG_TYPES (TREE_TYPE (current_function_decl));
429 $$ = error_mark_node;
430 if (TREE_VALUE (tree_last (types)) == void_type_node)
431 error ("`&...' used in function with fixed number of arguments");
432 else
433 {
434 if (pedantic)
435 pedwarn ("ANSI C forbids `&...'");
436 $$ = tree_last (DECL_ARGUMENTS (current_function_decl));
437 $$ = build_unary_op (ADDR_EXPR, $$, 0);
438 } }
439 */
440 | sizeof unary_expr %prec UNARY
441 { skip_evaluation--;
442 if (TREE_CODE ($2) == COMPONENT_REF
443 && DECL_C_BIT_FIELD (TREE_OPERAND ($2, 1)))
444 error ("`sizeof' applied to a bit-field");
445 $$ = c_sizeof (TREE_TYPE ($2)); }
446 | sizeof '(' typename ')' %prec HYPERUNARY
447 { skip_evaluation--;
448 $$ = c_sizeof (groktypename ($3)); }
449 | alignof unary_expr %prec UNARY
450 { skip_evaluation--;
451 $$ = c_alignof_expr ($2); }
452 | alignof '(' typename ')' %prec HYPERUNARY
453 { skip_evaluation--;
454 $$ = c_alignof (groktypename ($3)); }
455 | REALPART cast_expr %prec UNARY
456 { $$ = build_unary_op (REALPART_EXPR, $2, 0); }
457 | IMAGPART cast_expr %prec UNARY
458 { $$ = build_unary_op (IMAGPART_EXPR, $2, 0); }
459 | VA_ARG '(' expr_no_commas ',' typename ')'
460 { $$ = build_va_arg ($3, groktypename ($5)); }
461 ;
462
463 sizeof:
464 SIZEOF { skip_evaluation++; }
465 ;
466
467 alignof:
468 ALIGNOF { skip_evaluation++; }
469 ;
470
471 cast_expr:
472 unary_expr
473 | '(' typename ')' cast_expr %prec UNARY
474 { tree type = groktypename ($2);
475 $$ = build_c_cast (type, $4); }
476 | '(' typename ')' '{'
477 { start_init (NULL_TREE, NULL, 0);
478 $2 = groktypename ($2);
479 really_start_incremental_init ($2); }
480 initlist_maybe_comma '}' %prec UNARY
481 { const char *name;
482 tree result = pop_init_level (0);
483 tree type = $2;
484 finish_init ();
485
486 if (pedantic && ! flag_isoc9x)
487 pedwarn ("ANSI C forbids constructor expressions");
488 if (TYPE_NAME (type) != 0)
489 {
490 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
491 name = IDENTIFIER_POINTER (TYPE_NAME (type));
492 else
493 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
494 }
495 else
496 name = "";
497 $$ = result;
498 if (TREE_CODE (type) == ARRAY_TYPE && TYPE_SIZE (type) == 0)
499 {
500 int failure = complete_array_type (type, $$, 1);
501 if (failure)
502 abort ();
503 }
504 }
505 ;
506
507 expr_no_commas:
508 cast_expr
509 | expr_no_commas '+' expr_no_commas
510 { $$ = parser_build_binary_op ($2, $1, $3); }
511 | expr_no_commas '-' expr_no_commas
512 { $$ = parser_build_binary_op ($2, $1, $3); }
513 | expr_no_commas '*' expr_no_commas
514 { $$ = parser_build_binary_op ($2, $1, $3); }
515 | expr_no_commas '/' expr_no_commas
516 { $$ = parser_build_binary_op ($2, $1, $3); }
517 | expr_no_commas '%' expr_no_commas
518 { $$ = parser_build_binary_op ($2, $1, $3); }
519 | expr_no_commas LSHIFT expr_no_commas
520 { $$ = parser_build_binary_op ($2, $1, $3); }
521 | expr_no_commas RSHIFT expr_no_commas
522 { $$ = parser_build_binary_op ($2, $1, $3); }
523 | expr_no_commas ARITHCOMPARE expr_no_commas
524 { $$ = parser_build_binary_op ($2, $1, $3); }
525 | expr_no_commas EQCOMPARE expr_no_commas
526 { $$ = parser_build_binary_op ($2, $1, $3); }
527 | expr_no_commas '&' expr_no_commas
528 { $$ = parser_build_binary_op ($2, $1, $3); }
529 | expr_no_commas '|' expr_no_commas
530 { $$ = parser_build_binary_op ($2, $1, $3); }
531 | expr_no_commas '^' expr_no_commas
532 { $$ = parser_build_binary_op ($2, $1, $3); }
533 | expr_no_commas ANDAND
534 { $1 = truthvalue_conversion (default_conversion ($1));
535 skip_evaluation += $1 == boolean_false_node; }
536 expr_no_commas
537 { skip_evaluation -= $1 == boolean_false_node;
538 $$ = parser_build_binary_op (TRUTH_ANDIF_EXPR, $1, $4); }
539 | expr_no_commas OROR
540 { $1 = truthvalue_conversion (default_conversion ($1));
541 skip_evaluation += $1 == boolean_true_node; }
542 expr_no_commas
543 { skip_evaluation -= $1 == boolean_true_node;
544 $$ = parser_build_binary_op (TRUTH_ORIF_EXPR, $1, $4); }
545 | expr_no_commas '?'
546 { $1 = truthvalue_conversion (default_conversion ($1));
547 skip_evaluation += $1 == boolean_false_node; }
548 expr ':'
549 { skip_evaluation += (($1 == boolean_true_node)
550 - ($1 == boolean_false_node)); }
551 expr_no_commas
552 { skip_evaluation -= $1 == boolean_true_node;
553 $$ = build_conditional_expr ($1, $4, $7); }
554 | expr_no_commas '?'
555 { if (pedantic)
556 pedwarn ("ANSI C forbids omitting the middle term of a ?: expression");
557 /* Make sure first operand is calculated only once. */
558 $<ttype>2 = save_expr ($1);
559 $1 = truthvalue_conversion (default_conversion ($<ttype>2));
560 skip_evaluation += $1 == boolean_true_node; }
561 ':' expr_no_commas
562 { skip_evaluation -= $1 == boolean_true_node;
563 $$ = build_conditional_expr ($1, $<ttype>2, $5); }
564 | expr_no_commas '=' expr_no_commas
565 { char class;
566 $$ = build_modify_expr ($1, NOP_EXPR, $3);
567 class = TREE_CODE_CLASS (TREE_CODE ($$));
568 if (class == 'e' || class == '1'
569 || class == '2' || class == '<')
570 C_SET_EXP_ORIGINAL_CODE ($$, MODIFY_EXPR);
571 }
572 | expr_no_commas ASSIGN expr_no_commas
573 { char class;
574 $$ = build_modify_expr ($1, $2, $3);
575 /* This inhibits warnings in truthvalue_conversion. */
576 class = TREE_CODE_CLASS (TREE_CODE ($$));
577 if (class == 'e' || class == '1'
578 || class == '2' || class == '<')
579 C_SET_EXP_ORIGINAL_CODE ($$, ERROR_MARK);
580 }
581 ;
582
583 primary:
584 IDENTIFIER
585 {
586 $$ = lastiddecl;
587 if (!$$ || $$ == error_mark_node)
588 {
589 if (yychar == YYEMPTY)
590 yychar = YYLEX;
591 if (yychar == '(')
592 {
593 {
594 /* Ordinary implicit function declaration. */
595 $$ = implicitly_declare ($1);
596 assemble_external ($$);
597 TREE_USED ($$) = 1;
598 }
599 }
600 else if (current_function_decl == 0)
601 {
602 error ("`%s' undeclared here (not in a function)",
603 IDENTIFIER_POINTER ($1));
604 $$ = error_mark_node;
605 }
606 else
607 {
608 {
609 if (IDENTIFIER_GLOBAL_VALUE ($1) != error_mark_node
610 || IDENTIFIER_ERROR_LOCUS ($1) != current_function_decl)
611 {
612 error ("`%s' undeclared (first use in this function)",
613 IDENTIFIER_POINTER ($1));
614
615 if (! undeclared_variable_notice)
616 {
617 error ("(Each undeclared identifier is reported only once");
618 error ("for each function it appears in.)");
619 undeclared_variable_notice = 1;
620 }
621 }
622 $$ = error_mark_node;
623 /* Prevent repeated error messages. */
624 IDENTIFIER_GLOBAL_VALUE ($1) = error_mark_node;
625 IDENTIFIER_ERROR_LOCUS ($1) = current_function_decl;
626 }
627 }
628 }
629 else if (TREE_TYPE ($$) == error_mark_node)
630 $$ = error_mark_node;
631 else if (C_DECL_ANTICIPATED ($$))
632 {
633 /* The first time we see a build-in function used,
634 if it has not been declared. */
635 C_DECL_ANTICIPATED ($$) = 0;
636 if (yychar == YYEMPTY)
637 yychar = YYLEX;
638 if (yychar == '(')
639 {
640 /* Omit the implicit declaration we
641 would ordinarily do, so we don't lose
642 the actual built in type.
643 But print a diagnostic for the mismatch. */
644 if (TREE_CODE ($$) != FUNCTION_DECL)
645 error ("`%s' implicitly declared as function",
646 IDENTIFIER_POINTER (DECL_NAME ($$)));
647 else if ((TYPE_MODE (TREE_TYPE (TREE_TYPE ($$)))
648 != TYPE_MODE (integer_type_node))
649 && (TREE_TYPE (TREE_TYPE ($$))
650 != void_type_node))
651 pedwarn ("type mismatch in implicit declaration for built-in function `%s'",
652 IDENTIFIER_POINTER (DECL_NAME ($$)));
653 /* If it really returns void, change that to int. */
654 if (TREE_TYPE (TREE_TYPE ($$)) == void_type_node)
655 TREE_TYPE ($$)
656 = build_function_type (integer_type_node,
657 TYPE_ARG_TYPES (TREE_TYPE ($$)));
658 }
659 else
660 pedwarn ("built-in function `%s' used without declaration",
661 IDENTIFIER_POINTER (DECL_NAME ($$)));
662
663 /* Do what we would ordinarily do when a fn is used. */
664 assemble_external ($$);
665 TREE_USED ($$) = 1;
666 }
667 else
668 {
669 assemble_external ($$);
670 TREE_USED ($$) = 1;
671 }
672
673 if (TREE_CODE ($$) == CONST_DECL)
674 {
675 $$ = DECL_INITIAL ($$);
676 /* This is to prevent an enum whose value is 0
677 from being considered a null pointer constant. */
678 $$ = build1 (NOP_EXPR, TREE_TYPE ($$), $$);
679 TREE_CONSTANT ($$) = 1;
680 }
681 }
682 | CONSTANT
683 | string
684 { $$ = combine_strings ($1); }
685 | '(' expr ')'
686 { char class = TREE_CODE_CLASS (TREE_CODE ($2));
687 if (class == 'e' || class == '1'
688 || class == '2' || class == '<')
689 C_SET_EXP_ORIGINAL_CODE ($2, ERROR_MARK);
690 $$ = $2; }
691 | '(' error ')'
692 { $$ = error_mark_node; }
693 | compstmt_primary_start compstmt_nostart ')'
694 { tree rtl_exp;
695 if (pedantic)
696 pedwarn ("ANSI C forbids braced-groups within expressions");
697 pop_iterator_stack ();
698 pop_label_level ();
699 rtl_exp = expand_end_stmt_expr ($1);
700 /* The statements have side effects, so the group does. */
701 TREE_SIDE_EFFECTS (rtl_exp) = 1;
702
703 if (TREE_CODE ($2) == BLOCK)
704 {
705 /* Make a BIND_EXPR for the BLOCK already made. */
706 $$ = build (BIND_EXPR, TREE_TYPE (rtl_exp),
707 NULL_TREE, rtl_exp, $2);
708 /* Remove the block from the tree at this point.
709 It gets put back at the proper place
710 when the BIND_EXPR is expanded. */
711 delete_block ($2);
712 }
713 else
714 $$ = $2;
715 }
716 | compstmt_primary_start error ')'
717 {
718 /* Make sure we call expand_end_stmt_expr. Otherwise
719 we are likely to lose sequences and crash later. */
720 pop_iterator_stack ();
721 pop_label_level ();
722 expand_end_stmt_expr ($1);
723 $$ = error_mark_node;
724 }
725 | primary '(' exprlist ')' %prec '.'
726 { $$ = build_function_call ($1, $3); }
727 | primary '[' expr ']' %prec '.'
728 { $$ = build_array_ref ($1, $3); }
729 | primary '.' identifier
730 {
731 $$ = build_component_ref ($1, $3);
732 }
733 | primary POINTSAT identifier
734 {
735 tree expr = build_indirect_ref ($1, "->");
736
737 $$ = build_component_ref (expr, $3);
738 }
739 | primary PLUSPLUS
740 { $$ = build_unary_op (POSTINCREMENT_EXPR, $1, 0); }
741 | primary MINUSMINUS
742 { $$ = build_unary_op (POSTDECREMENT_EXPR, $1, 0); }
743 ;
744
745 /* Produces a STRING_CST with perhaps more STRING_CSTs chained onto it. */
746 string:
747 STRING
748 | string STRING
749 { $$ = chainon ($1, $2);
750 if (warn_traditional && !in_system_header)
751 warning ("Use of ANSI string concatenation");
752 }
753 ;
754
755
756 old_style_parm_decls:
757 /* empty */
758 | datadecls
759 | datadecls ELLIPSIS
760 /* ... is used here to indicate a varargs function. */
761 { c_mark_varargs ();
762 if (pedantic)
763 pedwarn ("ANSI C does not permit use of `varargs.h'"); }
764 ;
765
766 /* The following are analogous to lineno_decl, decls and decl
767 except that they do not allow nested functions.
768 They are used for old-style parm decls. */
769 lineno_datadecl:
770 save_filename save_lineno datadecl
771 { }
772 ;
773
774 datadecls:
775 lineno_datadecl
776 | errstmt
777 | datadecls lineno_datadecl
778 | lineno_datadecl errstmt
779 ;
780
781 /* We don't allow prefix attributes here because they cause reduce/reduce
782 conflicts: we can't know whether we're parsing a function decl with
783 attribute suffix, or function defn with attribute prefix on first old
784 style parm. */
785 datadecl:
786 typed_declspecs_no_prefix_attr setspecs initdecls ';'
787 { current_declspecs = TREE_VALUE (declspec_stack);
788 prefix_attributes = TREE_PURPOSE (declspec_stack);
789 declspec_stack = TREE_CHAIN (declspec_stack);
790 resume_momentary ($2); }
791 | declmods_no_prefix_attr setspecs notype_initdecls ';'
792 { current_declspecs = TREE_VALUE (declspec_stack);
793 prefix_attributes = TREE_PURPOSE (declspec_stack);
794 declspec_stack = TREE_CHAIN (declspec_stack);
795 resume_momentary ($2); }
796 | typed_declspecs_no_prefix_attr ';'
797 { shadow_tag_warned ($1, 1);
798 pedwarn ("empty declaration"); }
799 | declmods_no_prefix_attr ';'
800 { pedwarn ("empty declaration"); }
801 ;
802
803 /* This combination which saves a lineno before a decl
804 is the normal thing to use, rather than decl itself.
805 This is to avoid shift/reduce conflicts in contexts
806 where statement labels are allowed. */
807 lineno_decl:
808 save_filename save_lineno decl
809 { }
810 ;
811
812 decls:
813 lineno_decl
814 | errstmt
815 | decls lineno_decl
816 | lineno_decl errstmt
817 ;
818
819 /* records the type and storage class specs to use for processing
820 the declarators that follow.
821 Maintains a stack of outer-level values of current_declspecs,
822 for the sake of parm declarations nested in function declarators. */
823 setspecs: /* empty */
824 { $$ = suspend_momentary ();
825 pending_xref_error ();
826 declspec_stack = tree_cons (prefix_attributes,
827 current_declspecs,
828 declspec_stack);
829 split_specs_attrs ($<ttype>0,
830 &current_declspecs, &prefix_attributes); }
831 ;
832
833 /* ??? Yuck. See after_type_declarator. */
834 setattrs: /* empty */
835 { prefix_attributes = chainon (prefix_attributes, $<ttype>0); }
836 ;
837
838 decl:
839 typed_declspecs setspecs initdecls ';'
840 { current_declspecs = TREE_VALUE (declspec_stack);
841 prefix_attributes = TREE_PURPOSE (declspec_stack);
842 declspec_stack = TREE_CHAIN (declspec_stack);
843 resume_momentary ($2); }
844 | declmods setspecs notype_initdecls ';'
845 { current_declspecs = TREE_VALUE (declspec_stack);
846 prefix_attributes = TREE_PURPOSE (declspec_stack);
847 declspec_stack = TREE_CHAIN (declspec_stack);
848 resume_momentary ($2); }
849 | typed_declspecs setspecs nested_function
850 { current_declspecs = TREE_VALUE (declspec_stack);
851 prefix_attributes = TREE_PURPOSE (declspec_stack);
852 declspec_stack = TREE_CHAIN (declspec_stack);
853 resume_momentary ($2); }
854 | declmods setspecs notype_nested_function
855 { current_declspecs = TREE_VALUE (declspec_stack);
856 prefix_attributes = TREE_PURPOSE (declspec_stack);
857 declspec_stack = TREE_CHAIN (declspec_stack);
858 resume_momentary ($2); }
859 | typed_declspecs ';'
860 { shadow_tag ($1); }
861 | declmods ';'
862 { pedwarn ("empty declaration"); }
863 | extension decl
864 { RESTORE_WARN_FLAGS ($1); }
865 ;
866
867 /* Declspecs which contain at least one type specifier or typedef name.
868 (Just `const' or `volatile' is not enough.)
869 A typedef'd name following these is taken as a name to be declared.
870 Declspecs have a non-NULL TREE_VALUE, attributes do not. */
871
872 typed_declspecs:
873 typespec reserved_declspecs
874 { $$ = tree_cons (NULL_TREE, $1, $2); }
875 | declmods typespec reserved_declspecs
876 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
877 ;
878
879 reserved_declspecs: /* empty */
880 { $$ = NULL_TREE; }
881 | reserved_declspecs typespecqual_reserved
882 { $$ = tree_cons (NULL_TREE, $2, $1); }
883 | reserved_declspecs SCSPEC
884 { if (extra_warnings)
885 warning ("`%s' is not at beginning of declaration",
886 IDENTIFIER_POINTER ($2));
887 $$ = tree_cons (NULL_TREE, $2, $1); }
888 | reserved_declspecs attributes
889 { $$ = tree_cons ($2, NULL_TREE, $1); }
890 ;
891
892 typed_declspecs_no_prefix_attr:
893 typespec reserved_declspecs_no_prefix_attr
894 { $$ = tree_cons (NULL_TREE, $1, $2); }
895 | declmods_no_prefix_attr typespec reserved_declspecs_no_prefix_attr
896 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
897 ;
898
899 reserved_declspecs_no_prefix_attr:
900 /* empty */
901 { $$ = NULL_TREE; }
902 | reserved_declspecs_no_prefix_attr typespecqual_reserved
903 { $$ = tree_cons (NULL_TREE, $2, $1); }
904 | reserved_declspecs_no_prefix_attr SCSPEC
905 { if (extra_warnings)
906 warning ("`%s' is not at beginning of declaration",
907 IDENTIFIER_POINTER ($2));
908 $$ = tree_cons (NULL_TREE, $2, $1); }
909 ;
910
911 /* List of just storage classes, type modifiers, and prefix attributes.
912 A declaration can start with just this, but then it cannot be used
913 to redeclare a typedef-name.
914 Declspecs have a non-NULL TREE_VALUE, attributes do not. */
915
916 declmods:
917 declmods_no_prefix_attr
918 { $$ = $1; }
919 | attributes
920 { $$ = tree_cons ($1, NULL_TREE, NULL_TREE); }
921 | declmods declmods_no_prefix_attr
922 { $$ = chainon ($2, $1); }
923 | declmods attributes
924 { $$ = tree_cons ($2, NULL_TREE, $1); }
925 ;
926
927 declmods_no_prefix_attr:
928 TYPE_QUAL
929 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE);
930 TREE_STATIC ($$) = 1; }
931 | SCSPEC
932 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
933 | declmods_no_prefix_attr TYPE_QUAL
934 { $$ = tree_cons (NULL_TREE, $2, $1);
935 TREE_STATIC ($$) = 1; }
936 | declmods_no_prefix_attr SCSPEC
937 { if (extra_warnings && TREE_STATIC ($1))
938 warning ("`%s' is not at beginning of declaration",
939 IDENTIFIER_POINTER ($2));
940 $$ = tree_cons (NULL_TREE, $2, $1);
941 TREE_STATIC ($$) = TREE_STATIC ($1); }
942 ;
943
944
945 /* Used instead of declspecs where storage classes are not allowed
946 (that is, for typenames and structure components).
947 Don't accept a typedef-name if anything but a modifier precedes it. */
948
949 typed_typespecs:
950 typespec reserved_typespecquals
951 { $$ = tree_cons (NULL_TREE, $1, $2); }
952 | nonempty_type_quals typespec reserved_typespecquals
953 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
954 ;
955
956 reserved_typespecquals: /* empty */
957 { $$ = NULL_TREE; }
958 | reserved_typespecquals typespecqual_reserved
959 { $$ = tree_cons (NULL_TREE, $2, $1); }
960 ;
961
962 /* A typespec (but not a type qualifier).
963 Once we have seen one of these in a declaration,
964 if a typedef name appears then it is being redeclared. */
965
966 typespec: TYPESPEC
967 | structsp
968 | TYPENAME
969 { /* For a typedef name, record the meaning, not the name.
970 In case of `foo foo, bar;'. */
971 $$ = lookup_name ($1); }
972 | TYPEOF '(' expr ')'
973 { $$ = TREE_TYPE ($3); }
974 | TYPEOF '(' typename ')'
975 { $$ = groktypename ($3); }
976 ;
977
978 /* A typespec that is a reserved word, or a type qualifier. */
979
980 typespecqual_reserved: TYPESPEC
981 | TYPE_QUAL
982 | structsp
983 ;
984
985 initdecls:
986 initdcl
987 | initdecls ',' initdcl
988 ;
989
990 notype_initdecls:
991 notype_initdcl
992 | notype_initdecls ',' initdcl
993 ;
994
995 maybeasm:
996 /* empty */
997 { $$ = NULL_TREE; }
998 | ASM_KEYWORD '(' string ')'
999 { if (TREE_CHAIN ($3)) $3 = combine_strings ($3);
1000 $$ = $3;
1001 }
1002 ;
1003
1004 initdcl:
1005 declarator maybeasm maybe_attribute '='
1006 { $<ttype>$ = start_decl ($1, current_declspecs, 1,
1007 $3, prefix_attributes);
1008 start_init ($<ttype>$, $2, global_bindings_p ()); }
1009 init
1010 /* Note how the declaration of the variable is in effect while its init is parsed! */
1011 { finish_init ();
1012 finish_decl ($<ttype>5, $6, $2); }
1013 | declarator maybeasm maybe_attribute
1014 { tree d = start_decl ($1, current_declspecs, 0,
1015 $3, prefix_attributes);
1016 finish_decl (d, NULL_TREE, $2);
1017 }
1018 ;
1019
1020 notype_initdcl:
1021 notype_declarator maybeasm maybe_attribute '='
1022 { $<ttype>$ = start_decl ($1, current_declspecs, 1,
1023 $3, prefix_attributes);
1024 start_init ($<ttype>$, $2, global_bindings_p ()); }
1025 init
1026 /* Note how the declaration of the variable is in effect while its init is parsed! */
1027 { finish_init ();
1028 decl_attributes ($<ttype>5, $3, prefix_attributes);
1029 finish_decl ($<ttype>5, $6, $2); }
1030 | notype_declarator maybeasm maybe_attribute
1031 { tree d = start_decl ($1, current_declspecs, 0,
1032 $3, prefix_attributes);
1033 finish_decl (d, NULL_TREE, $2); }
1034 ;
1035 /* the * rules are dummies to accept the Apollo extended syntax
1036 so that the header files compile. */
1037 maybe_attribute:
1038 /* empty */
1039 { $$ = NULL_TREE; }
1040 | attributes
1041 { $$ = $1; }
1042 ;
1043
1044 attributes:
1045 attribute
1046 { $$ = $1; }
1047 | attributes attribute
1048 { $$ = chainon ($1, $2); }
1049 ;
1050
1051 attribute:
1052 ATTRIBUTE '(' '(' attribute_list ')' ')'
1053 { $$ = $4; }
1054 ;
1055
1056 attribute_list:
1057 attrib
1058 { $$ = $1; }
1059 | attribute_list ',' attrib
1060 { $$ = chainon ($1, $3); }
1061 ;
1062
1063 attrib:
1064 /* empty */
1065 { $$ = NULL_TREE; }
1066 | any_word
1067 { $$ = build_tree_list ($1, NULL_TREE); }
1068 | any_word '(' IDENTIFIER ')'
1069 { $$ = build_tree_list ($1, build_tree_list (NULL_TREE, $3)); }
1070 | any_word '(' IDENTIFIER ',' nonnull_exprlist ')'
1071 { $$ = build_tree_list ($1, tree_cons (NULL_TREE, $3, $5)); }
1072 | any_word '(' exprlist ')'
1073 { $$ = build_tree_list ($1, $3); }
1074 ;
1075
1076 /* This still leaves out most reserved keywords,
1077 shouldn't we include them? */
1078
1079 any_word:
1080 identifier
1081 | SCSPEC
1082 | TYPESPEC
1083 | TYPE_QUAL
1084 ;
1085 \f
1086 /* Initializers. `init' is the entry point. */
1087
1088 init:
1089 expr_no_commas
1090 | '{'
1091 { really_start_incremental_init (NULL_TREE);
1092 /* Note that the call to clear_momentary
1093 is in process_init_element. */
1094 push_momentary (); }
1095 initlist_maybe_comma '}'
1096 { $$ = pop_init_level (0);
1097 if ($$ == error_mark_node
1098 && ! (yychar == STRING || yychar == CONSTANT))
1099 pop_momentary ();
1100 else
1101 pop_momentary_nofree (); }
1102
1103 | error
1104 { $$ = error_mark_node; }
1105 ;
1106
1107 /* `initlist_maybe_comma' is the guts of an initializer in braces. */
1108 initlist_maybe_comma:
1109 /* empty */
1110 { if (pedantic)
1111 pedwarn ("ANSI C forbids empty initializer braces"); }
1112 | initlist1 maybecomma
1113 ;
1114
1115 initlist1:
1116 initelt
1117 | initlist1 ',' initelt
1118 ;
1119
1120 /* `initelt' is a single element of an initializer.
1121 It may use braces. */
1122 initelt:
1123 designator_list '=' initval
1124 | designator initval
1125 | identifier ':'
1126 { set_init_label ($1); }
1127 initval
1128 | initval
1129 ;
1130
1131 initval:
1132 '{'
1133 { push_init_level (0); }
1134 initlist_maybe_comma '}'
1135 { process_init_element (pop_init_level (0)); }
1136 | expr_no_commas
1137 { process_init_element ($1); }
1138 | error
1139 ;
1140
1141 designator_list:
1142 designator
1143 | designator_list designator
1144 ;
1145
1146 designator:
1147 '.' identifier
1148 { set_init_label ($2); }
1149 /* These are for labeled elements. The syntax for an array element
1150 initializer conflicts with the syntax for an Objective-C message,
1151 so don't include these productions in the Objective-C grammar. */
1152 | '[' expr_no_commas ELLIPSIS expr_no_commas ']'
1153 { set_init_index ($2, $4); }
1154 | '[' expr_no_commas ']'
1155 { set_init_index ($2, NULL_TREE); }
1156 ;
1157 \f
1158 nested_function:
1159 declarator
1160 { if (pedantic)
1161 pedwarn ("ANSI C forbids nested functions");
1162
1163 push_function_context ();
1164 if (! start_function (current_declspecs, $1,
1165 prefix_attributes, NULL_TREE, 1))
1166 {
1167 pop_function_context ();
1168 YYERROR1;
1169 }
1170 reinit_parse_for_function (); }
1171 old_style_parm_decls
1172 { store_parm_decls (); }
1173 /* This used to use compstmt_or_error.
1174 That caused a bug with input `f(g) int g {}',
1175 where the use of YYERROR1 above caused an error
1176 which then was handled by compstmt_or_error.
1177 There followed a repeated execution of that same rule,
1178 which called YYERROR1 again, and so on. */
1179 compstmt
1180 { finish_function (1);
1181 pop_function_context (); }
1182 ;
1183
1184 notype_nested_function:
1185 notype_declarator
1186 { if (pedantic)
1187 pedwarn ("ANSI C forbids nested functions");
1188
1189 push_function_context ();
1190 if (! start_function (current_declspecs, $1,
1191 prefix_attributes, NULL_TREE, 1))
1192 {
1193 pop_function_context ();
1194 YYERROR1;
1195 }
1196 reinit_parse_for_function (); }
1197 old_style_parm_decls
1198 { store_parm_decls (); }
1199 /* This used to use compstmt_or_error.
1200 That caused a bug with input `f(g) int g {}',
1201 where the use of YYERROR1 above caused an error
1202 which then was handled by compstmt_or_error.
1203 There followed a repeated execution of that same rule,
1204 which called YYERROR1 again, and so on. */
1205 compstmt
1206 { finish_function (1);
1207 pop_function_context (); }
1208 ;
1209
1210 /* Any kind of declarator (thus, all declarators allowed
1211 after an explicit typespec). */
1212
1213 declarator:
1214 after_type_declarator
1215 | notype_declarator
1216 ;
1217
1218 /* A declarator that is allowed only after an explicit typespec. */
1219
1220 after_type_declarator:
1221 '(' after_type_declarator ')'
1222 { $$ = $2; }
1223 | after_type_declarator '(' parmlist_or_identifiers %prec '.'
1224 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1225 /* | after_type_declarator '(' error ')' %prec '.'
1226 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1227 poplevel (0, 0, 0); } */
1228 | after_type_declarator '[' expr ']' %prec '.'
1229 { $$ = build_nt (ARRAY_REF, $1, $3); }
1230 | after_type_declarator '[' ']' %prec '.'
1231 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1232 | '*' type_quals after_type_declarator %prec UNARY
1233 { $$ = make_pointer_declarator ($2, $3); }
1234 /* ??? Yuck. setattrs is a quick hack. We can't use
1235 prefix_attributes because $1 only applies to this
1236 declarator. We assume setspecs has already been done.
1237 setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1238 attributes could be recognized here or in `attributes'). */
1239 | attributes setattrs after_type_declarator
1240 { $$ = $3; }
1241 | TYPENAME
1242 ;
1243
1244 /* Kinds of declarator that can appear in a parameter list
1245 in addition to notype_declarator. This is like after_type_declarator
1246 but does not allow a typedef name in parentheses as an identifier
1247 (because it would conflict with a function with that typedef as arg). */
1248
1249 parm_declarator:
1250 parm_declarator '(' parmlist_or_identifiers %prec '.'
1251 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1252 /* | parm_declarator '(' error ')' %prec '.'
1253 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1254 poplevel (0, 0, 0); } */
1255 | parm_declarator '[' '*' ']' %prec '.'
1256 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE);
1257 if (! flag_isoc9x)
1258 error ("`[*]' in parameter declaration only allowed in ISO C 9x");
1259 }
1260 | parm_declarator '[' expr ']' %prec '.'
1261 { $$ = build_nt (ARRAY_REF, $1, $3); }
1262 | parm_declarator '[' ']' %prec '.'
1263 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1264 | '*' type_quals parm_declarator %prec UNARY
1265 { $$ = make_pointer_declarator ($2, $3); }
1266 /* ??? Yuck. setattrs is a quick hack. We can't use
1267 prefix_attributes because $1 only applies to this
1268 declarator. We assume setspecs has already been done.
1269 setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1270 attributes could be recognized here or in `attributes'). */
1271 | attributes setattrs parm_declarator
1272 { $$ = $3; }
1273 | TYPENAME
1274 ;
1275
1276 /* A declarator allowed whether or not there has been
1277 an explicit typespec. These cannot redeclare a typedef-name. */
1278
1279 notype_declarator:
1280 notype_declarator '(' parmlist_or_identifiers %prec '.'
1281 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1282 /* | notype_declarator '(' error ')' %prec '.'
1283 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1284 poplevel (0, 0, 0); } */
1285 | '(' notype_declarator ')'
1286 { $$ = $2; }
1287 | '*' type_quals notype_declarator %prec UNARY
1288 { $$ = make_pointer_declarator ($2, $3); }
1289 | notype_declarator '[' '*' ']' %prec '.'
1290 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE);
1291 if (! flag_isoc9x)
1292 error ("`[*]' in parameter declaration only allowed in ISO C 9x");
1293 }
1294 | notype_declarator '[' expr ']' %prec '.'
1295 { $$ = build_nt (ARRAY_REF, $1, $3); }
1296 | notype_declarator '[' ']' %prec '.'
1297 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1298 /* ??? Yuck. setattrs is a quick hack. We can't use
1299 prefix_attributes because $1 only applies to this
1300 declarator. We assume setspecs has already been done.
1301 setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1302 attributes could be recognized here or in `attributes'). */
1303 | attributes setattrs notype_declarator
1304 { $$ = $3; }
1305 | IDENTIFIER
1306 ;
1307
1308 struct_head:
1309 STRUCT
1310 { $$ = NULL_TREE; }
1311 | STRUCT attributes
1312 { $$ = $2; }
1313 ;
1314
1315 union_head:
1316 UNION
1317 { $$ = NULL_TREE; }
1318 | UNION attributes
1319 { $$ = $2; }
1320 ;
1321
1322 enum_head:
1323 ENUM
1324 { $$ = NULL_TREE; }
1325 | ENUM attributes
1326 { $$ = $2; }
1327 ;
1328
1329 structsp:
1330 struct_head identifier '{'
1331 { $$ = start_struct (RECORD_TYPE, $2);
1332 /* Start scope of tag before parsing components. */
1333 }
1334 component_decl_list '}' maybe_attribute
1335 { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }
1336 | struct_head '{' component_decl_list '}' maybe_attribute
1337 { $$ = finish_struct (start_struct (RECORD_TYPE, NULL_TREE),
1338 $3, chainon ($1, $5));
1339 }
1340 | struct_head identifier
1341 { $$ = xref_tag (RECORD_TYPE, $2); }
1342 | union_head identifier '{'
1343 { $$ = start_struct (UNION_TYPE, $2); }
1344 component_decl_list '}' maybe_attribute
1345 { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }
1346 | union_head '{' component_decl_list '}' maybe_attribute
1347 { $$ = finish_struct (start_struct (UNION_TYPE, NULL_TREE),
1348 $3, chainon ($1, $5));
1349 }
1350 | union_head identifier
1351 { $$ = xref_tag (UNION_TYPE, $2); }
1352 | enum_head identifier '{'
1353 { $<itype>3 = suspend_momentary ();
1354 $$ = start_enum ($2); }
1355 enumlist maybecomma_warn '}' maybe_attribute
1356 { $$= finish_enum ($<ttype>4, nreverse ($5), chainon ($1, $8));
1357 resume_momentary ($<itype>3); }
1358 | enum_head '{'
1359 { $<itype>2 = suspend_momentary ();
1360 $$ = start_enum (NULL_TREE); }
1361 enumlist maybecomma_warn '}' maybe_attribute
1362 { $$= finish_enum ($<ttype>3, nreverse ($4), chainon ($1, $7));
1363 resume_momentary ($<itype>2); }
1364 | enum_head identifier
1365 { $$ = xref_tag (ENUMERAL_TYPE, $2); }
1366 ;
1367
1368 maybecomma:
1369 /* empty */
1370 | ','
1371 ;
1372
1373 maybecomma_warn:
1374 /* empty */
1375 | ','
1376 { if (pedantic && ! flag_isoc9x)
1377 pedwarn ("comma at end of enumerator list"); }
1378 ;
1379
1380 component_decl_list:
1381 component_decl_list2
1382 { $$ = $1; }
1383 | component_decl_list2 component_decl
1384 { $$ = chainon ($1, $2);
1385 pedwarn ("no semicolon at end of struct or union"); }
1386 ;
1387
1388 component_decl_list2: /* empty */
1389 { $$ = NULL_TREE; }
1390 | component_decl_list2 component_decl ';'
1391 { $$ = chainon ($1, $2); }
1392 | component_decl_list2 ';'
1393 { if (pedantic)
1394 pedwarn ("extra semicolon in struct or union specified"); }
1395 ;
1396
1397 /* There is a shift-reduce conflict here, because `components' may
1398 start with a `typename'. It happens that shifting (the default resolution)
1399 does the right thing, because it treats the `typename' as part of
1400 a `typed_typespecs'.
1401
1402 It is possible that this same technique would allow the distinction
1403 between `notype_initdecls' and `initdecls' to be eliminated.
1404 But I am being cautious and not trying it. */
1405
1406 component_decl:
1407 typed_typespecs setspecs components
1408 { $$ = $3;
1409 current_declspecs = TREE_VALUE (declspec_stack);
1410 prefix_attributes = TREE_PURPOSE (declspec_stack);
1411 declspec_stack = TREE_CHAIN (declspec_stack);
1412 resume_momentary ($2); }
1413 | typed_typespecs setspecs save_filename save_lineno maybe_attribute
1414 {
1415 /* Support for unnamed structs or unions as members of
1416 structs or unions (which is [a] useful and [b] supports
1417 MS P-SDK). */
1418 if (pedantic)
1419 pedwarn ("ANSI C doesn't support unnamed structs/unions");
1420
1421 $$ = grokfield($3, $4, NULL, current_declspecs, NULL_TREE);
1422 current_declspecs = TREE_VALUE (declspec_stack);
1423 prefix_attributes = TREE_PURPOSE (declspec_stack);
1424 declspec_stack = TREE_CHAIN (declspec_stack);
1425 resume_momentary ($2);
1426 }
1427 | nonempty_type_quals setspecs components
1428 { $$ = $3;
1429 current_declspecs = TREE_VALUE (declspec_stack);
1430 prefix_attributes = TREE_PURPOSE (declspec_stack);
1431 declspec_stack = TREE_CHAIN (declspec_stack);
1432 resume_momentary ($2); }
1433 | nonempty_type_quals
1434 { if (pedantic)
1435 pedwarn ("ANSI C forbids member declarations with no members");
1436 shadow_tag($1);
1437 $$ = NULL_TREE; }
1438 | error
1439 { $$ = NULL_TREE; }
1440 | extension component_decl
1441 { $$ = $2;
1442 RESTORE_WARN_FLAGS ($1); }
1443 ;
1444
1445 components:
1446 component_declarator
1447 | components ',' component_declarator
1448 { $$ = chainon ($1, $3); }
1449 ;
1450
1451 component_declarator:
1452 save_filename save_lineno declarator maybe_attribute
1453 { $$ = grokfield ($1, $2, $3, current_declspecs, NULL_TREE);
1454 decl_attributes ($$, $4, prefix_attributes); }
1455 | save_filename save_lineno
1456 declarator ':' expr_no_commas maybe_attribute
1457 { $$ = grokfield ($1, $2, $3, current_declspecs, $5);
1458 decl_attributes ($$, $6, prefix_attributes); }
1459 | save_filename save_lineno ':' expr_no_commas maybe_attribute
1460 { $$ = grokfield ($1, $2, NULL_TREE, current_declspecs, $4);
1461 decl_attributes ($$, $5, prefix_attributes); }
1462 ;
1463
1464 /* We chain the enumerators in reverse order.
1465 They are put in forward order where enumlist is used.
1466 (The order used to be significant, but no longer is so.
1467 However, we still maintain the order, just to be clean.) */
1468
1469 enumlist:
1470 enumerator
1471 | enumlist ',' enumerator
1472 { if ($1 == error_mark_node)
1473 $$ = $1;
1474 else
1475 $$ = chainon ($3, $1); }
1476 | error
1477 { $$ = error_mark_node; }
1478 ;
1479
1480
1481 enumerator:
1482 identifier
1483 { $$ = build_enumerator ($1, NULL_TREE); }
1484 | identifier '=' expr_no_commas
1485 { $$ = build_enumerator ($1, $3); }
1486 ;
1487
1488 typename:
1489 typed_typespecs absdcl
1490 { $$ = build_tree_list ($1, $2); }
1491 | nonempty_type_quals absdcl
1492 { $$ = build_tree_list ($1, $2); }
1493 ;
1494
1495 absdcl: /* an absolute declarator */
1496 /* empty */
1497 { $$ = NULL_TREE; }
1498 | absdcl1
1499 ;
1500
1501 nonempty_type_quals:
1502 TYPE_QUAL
1503 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
1504 | nonempty_type_quals TYPE_QUAL
1505 { $$ = tree_cons (NULL_TREE, $2, $1); }
1506 ;
1507
1508 type_quals:
1509 /* empty */
1510 { $$ = NULL_TREE; }
1511 | type_quals TYPE_QUAL
1512 { $$ = tree_cons (NULL_TREE, $2, $1); }
1513 ;
1514
1515 absdcl1: /* a nonempty absolute declarator */
1516 '(' absdcl1 ')'
1517 { $$ = $2; }
1518 /* `(typedef)1' is `int'. */
1519 | '*' type_quals absdcl1 %prec UNARY
1520 { $$ = make_pointer_declarator ($2, $3); }
1521 | '*' type_quals %prec UNARY
1522 { $$ = make_pointer_declarator ($2, NULL_TREE); }
1523 | absdcl1 '(' parmlist %prec '.'
1524 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1525 | absdcl1 '[' expr ']' %prec '.'
1526 { $$ = build_nt (ARRAY_REF, $1, $3); }
1527 | absdcl1 '[' ']' %prec '.'
1528 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1529 | '(' parmlist %prec '.'
1530 { $$ = build_nt (CALL_EXPR, NULL_TREE, $2, NULL_TREE); }
1531 | '[' expr ']' %prec '.'
1532 { $$ = build_nt (ARRAY_REF, NULL_TREE, $2); }
1533 | '[' ']' %prec '.'
1534 { $$ = build_nt (ARRAY_REF, NULL_TREE, NULL_TREE); }
1535 /* ??? It appears we have to support attributes here, however
1536 using prefix_attributes is wrong. */
1537 | attributes setattrs absdcl1
1538 { $$ = $3; }
1539 ;
1540
1541 /* at least one statement, the first of which parses without error. */
1542 /* stmts is used only after decls, so an invalid first statement
1543 is actually regarded as an invalid decl and part of the decls. */
1544
1545 stmts:
1546 lineno_stmt_or_labels
1547 {
1548 if (pedantic && $1)
1549 pedwarn ("ANSI C forbids label at end of compound statement");
1550 }
1551 ;
1552
1553 lineno_stmt_or_labels:
1554 lineno_stmt_or_label
1555 | lineno_stmt_or_labels lineno_stmt_or_label
1556 { $$ = $2; }
1557 | lineno_stmt_or_labels errstmt
1558 { $$ = 0; }
1559 ;
1560
1561 xstmts:
1562 /* empty */
1563 | stmts
1564 ;
1565
1566 errstmt: error ';'
1567 ;
1568
1569 pushlevel: /* empty */
1570 { emit_line_note (input_filename, lineno);
1571 pushlevel (0);
1572 clear_last_expr ();
1573 push_momentary ();
1574 expand_start_bindings (0);
1575 }
1576 ;
1577
1578 /* Read zero or more forward-declarations for labels
1579 that nested functions can jump to. */
1580 maybe_label_decls:
1581 /* empty */
1582 | label_decls
1583 { if (pedantic)
1584 pedwarn ("ANSI C forbids label declarations"); }
1585 ;
1586
1587 label_decls:
1588 label_decl
1589 | label_decls label_decl
1590 ;
1591
1592 label_decl:
1593 LABEL identifiers_or_typenames ';'
1594 { tree link;
1595 for (link = $2; link; link = TREE_CHAIN (link))
1596 {
1597 tree label = shadow_label (TREE_VALUE (link));
1598 C_DECLARED_LABEL_FLAG (label) = 1;
1599 declare_nonlocal_label (label);
1600 }
1601 }
1602 ;
1603
1604 /* This is the body of a function definition.
1605 It causes syntax errors to ignore to the next openbrace. */
1606 compstmt_or_error:
1607 compstmt
1608 {}
1609 | error compstmt
1610 ;
1611
1612 compstmt_start: '{' { compstmt_count++; }
1613
1614 compstmt_nostart: '}'
1615 { $$ = convert (void_type_node, integer_zero_node); }
1616 | pushlevel maybe_label_decls decls xstmts '}'
1617 { emit_line_note (input_filename, lineno);
1618 expand_end_bindings (getdecls (), 1, 0);
1619 $$ = poplevel (1, 1, 0);
1620 if (yychar == CONSTANT || yychar == STRING)
1621 pop_momentary_nofree ();
1622 else
1623 pop_momentary (); }
1624 | pushlevel maybe_label_decls error '}'
1625 { emit_line_note (input_filename, lineno);
1626 expand_end_bindings (getdecls (), kept_level_p (), 0);
1627 $$ = poplevel (kept_level_p (), 0, 0);
1628 if (yychar == CONSTANT || yychar == STRING)
1629 pop_momentary_nofree ();
1630 else
1631 pop_momentary (); }
1632 | pushlevel maybe_label_decls stmts '}'
1633 { emit_line_note (input_filename, lineno);
1634 expand_end_bindings (getdecls (), kept_level_p (), 0);
1635 $$ = poplevel (kept_level_p (), 0, 0);
1636 if (yychar == CONSTANT || yychar == STRING)
1637 pop_momentary_nofree ();
1638 else
1639 pop_momentary (); }
1640 ;
1641
1642 compstmt_primary_start:
1643 '(' '{'
1644 { if (current_function_decl == 0)
1645 {
1646 error ("braced-group within expression allowed only inside a function");
1647 YYERROR;
1648 }
1649 /* We must force a BLOCK for this level
1650 so that, if it is not expanded later,
1651 there is a way to turn off the entire subtree of blocks
1652 that are contained in it. */
1653 keep_next_level ();
1654 push_iterator_stack ();
1655 push_label_level ();
1656 $$ = expand_start_stmt_expr ();
1657 compstmt_count++;
1658 }
1659
1660 compstmt: compstmt_start compstmt_nostart
1661 { $$ = $2; }
1662 ;
1663
1664 /* Value is number of statements counted as of the closeparen. */
1665 simple_if:
1666 if_prefix lineno_labeled_stmt
1667 /* Make sure c_expand_end_cond is run once
1668 for each call to c_expand_start_cond.
1669 Otherwise a crash is likely. */
1670 | if_prefix error
1671 ;
1672
1673 if_prefix:
1674 IF '(' expr ')'
1675 { emit_line_note ($<filename>-1, $<lineno>0);
1676 c_expand_start_cond (truthvalue_conversion ($3), 0,
1677 compstmt_count);
1678 $<itype>$ = stmt_count;
1679 if_stmt_file = $<filename>-1;
1680 if_stmt_line = $<lineno>0;
1681 position_after_white_space (); }
1682 ;
1683
1684 /* This is a subroutine of stmt.
1685 It is used twice, once for valid DO statements
1686 and once for catching errors in parsing the end test. */
1687 do_stmt_start:
1688 DO
1689 { stmt_count++;
1690 compstmt_count++;
1691 emit_line_note ($<filename>-1, $<lineno>0);
1692 /* See comment in `while' alternative, above. */
1693 emit_nop ();
1694 expand_start_loop_continue_elsewhere (1);
1695 position_after_white_space (); }
1696 lineno_labeled_stmt WHILE
1697 { expand_loop_continue_here (); }
1698 ;
1699
1700 save_filename:
1701 { $$ = input_filename; }
1702 ;
1703
1704 save_lineno:
1705 { $$ = lineno; }
1706 ;
1707
1708 lineno_labeled_stmt:
1709 save_filename save_lineno stmt
1710 { }
1711 /* | save_filename save_lineno error
1712 { }
1713 */
1714 | save_filename save_lineno label lineno_labeled_stmt
1715 { }
1716 ;
1717
1718 lineno_stmt_or_label:
1719 save_filename save_lineno stmt_or_label
1720 { $$ = $3; }
1721 ;
1722
1723 stmt_or_label:
1724 stmt
1725 { $$ = 0; }
1726 | label
1727 { $$ = 1; }
1728 ;
1729
1730 /* Parse a single real statement, not including any labels. */
1731 stmt:
1732 compstmt
1733 { stmt_count++; }
1734 | all_iter_stmt
1735 | expr ';'
1736 { stmt_count++;
1737 emit_line_note ($<filename>-1, $<lineno>0);
1738 /* It appears that this should not be done--that a non-lvalue array
1739 shouldn't get an error if the value isn't used.
1740 Section 3.2.2.1 says that an array lvalue gets converted to a pointer
1741 if it appears as a top-level expression,
1742 but says nothing about non-lvalue arrays. */
1743 #if 0
1744 /* Call default_conversion to get an error
1745 on referring to a register array if pedantic. */
1746 if (TREE_CODE (TREE_TYPE ($1)) == ARRAY_TYPE
1747 || TREE_CODE (TREE_TYPE ($1)) == FUNCTION_TYPE)
1748 $1 = default_conversion ($1);
1749 #endif
1750 iterator_expand ($1);
1751 clear_momentary (); }
1752 | simple_if ELSE
1753 { c_expand_start_else ();
1754 $<itype>1 = stmt_count;
1755 position_after_white_space (); }
1756 lineno_labeled_stmt
1757 { c_expand_end_cond ();
1758 if (extra_warnings && stmt_count == $<itype>1)
1759 warning ("empty body in an else-statement"); }
1760 | simple_if %prec IF
1761 { c_expand_end_cond ();
1762 /* This warning is here instead of in simple_if, because we
1763 do not want a warning if an empty if is followed by an
1764 else statement. Increment stmt_count so we don't
1765 give a second error if this is a nested `if'. */
1766 if (extra_warnings && stmt_count++ == $<itype>1)
1767 warning_with_file_and_line (if_stmt_file, if_stmt_line,
1768 "empty body in an if-statement"); }
1769 /* Make sure c_expand_end_cond is run once
1770 for each call to c_expand_start_cond.
1771 Otherwise a crash is likely. */
1772 | simple_if ELSE error
1773 { c_expand_end_cond (); }
1774 | WHILE
1775 { stmt_count++;
1776 emit_line_note ($<filename>-1, $<lineno>0);
1777 /* The emit_nop used to come before emit_line_note,
1778 but that made the nop seem like part of the preceding line.
1779 And that was confusing when the preceding line was
1780 inside of an if statement and was not really executed.
1781 I think it ought to work to put the nop after the line number.
1782 We will see. --rms, July 15, 1991. */
1783 emit_nop (); }
1784 '(' expr ')'
1785 { /* Don't start the loop till we have succeeded
1786 in parsing the end test. This is to make sure
1787 that we end every loop we start. */
1788 expand_start_loop (1);
1789 emit_line_note (input_filename, lineno);
1790 expand_exit_loop_if_false (NULL_PTR,
1791 truthvalue_conversion ($4));
1792 position_after_white_space (); }
1793 lineno_labeled_stmt
1794 { expand_end_loop (); }
1795 | do_stmt_start
1796 '(' expr ')' ';'
1797 { emit_line_note (input_filename, lineno);
1798 expand_exit_loop_if_false (NULL_PTR,
1799 truthvalue_conversion ($3));
1800 expand_end_loop ();
1801 clear_momentary (); }
1802 /* This rule is needed to make sure we end every loop we start. */
1803 | do_stmt_start error
1804 { expand_end_loop ();
1805 clear_momentary (); }
1806 | FOR
1807 '(' xexpr ';'
1808 { stmt_count++;
1809 emit_line_note ($<filename>-1, $<lineno>0);
1810 /* See comment in `while' alternative, above. */
1811 emit_nop ();
1812 if ($3) c_expand_expr_stmt ($3);
1813 /* Next step is to call expand_start_loop_continue_elsewhere,
1814 but wait till after we parse the entire for (...).
1815 Otherwise, invalid input might cause us to call that
1816 fn without calling expand_end_loop. */
1817 }
1818 xexpr ';'
1819 /* Can't emit now; wait till after expand_start_loop... */
1820 { $<lineno>7 = lineno;
1821 $<filename>$ = input_filename; }
1822 xexpr ')'
1823 {
1824 /* Start the loop. Doing this after parsing
1825 all the expressions ensures we will end the loop. */
1826 expand_start_loop_continue_elsewhere (1);
1827 /* Emit the end-test, with a line number. */
1828 emit_line_note ($<filename>8, $<lineno>7);
1829 if ($6)
1830 expand_exit_loop_if_false (NULL_PTR,
1831 truthvalue_conversion ($6));
1832 /* Don't let the tree nodes for $9 be discarded by
1833 clear_momentary during the parsing of the next stmt. */
1834 push_momentary ();
1835 $<lineno>7 = lineno;
1836 $<filename>8 = input_filename;
1837 position_after_white_space (); }
1838 lineno_labeled_stmt
1839 { /* Emit the increment expression, with a line number. */
1840 emit_line_note ($<filename>8, $<lineno>7);
1841 expand_loop_continue_here ();
1842 if ($9)
1843 c_expand_expr_stmt ($9);
1844 if (yychar == CONSTANT || yychar == STRING)
1845 pop_momentary_nofree ();
1846 else
1847 pop_momentary ();
1848 expand_end_loop (); }
1849 | SWITCH '(' expr ')'
1850 { stmt_count++;
1851 emit_line_note ($<filename>-1, $<lineno>0);
1852 c_expand_start_case ($3);
1853 /* Don't let the tree nodes for $3 be discarded by
1854 clear_momentary during the parsing of the next stmt. */
1855 push_momentary ();
1856 position_after_white_space (); }
1857 lineno_labeled_stmt
1858 { expand_end_case ($3);
1859 if (yychar == CONSTANT || yychar == STRING)
1860 pop_momentary_nofree ();
1861 else
1862 pop_momentary (); }
1863 | BREAK ';'
1864 { stmt_count++;
1865 emit_line_note ($<filename>-1, $<lineno>0);
1866 if ( ! expand_exit_something ())
1867 error ("break statement not within loop or switch"); }
1868 | CONTINUE ';'
1869 { stmt_count++;
1870 emit_line_note ($<filename>-1, $<lineno>0);
1871 if (! expand_continue_loop (NULL_PTR))
1872 error ("continue statement not within a loop"); }
1873 | RETURN ';'
1874 { stmt_count++;
1875 emit_line_note ($<filename>-1, $<lineno>0);
1876 c_expand_return (NULL_TREE); }
1877 | RETURN expr ';'
1878 { stmt_count++;
1879 emit_line_note ($<filename>-1, $<lineno>0);
1880 c_expand_return ($2); }
1881 | ASM_KEYWORD maybe_type_qual '(' expr ')' ';'
1882 { stmt_count++;
1883 emit_line_note ($<filename>-1, $<lineno>0);
1884 STRIP_NOPS ($4);
1885 if ((TREE_CODE ($4) == ADDR_EXPR
1886 && TREE_CODE (TREE_OPERAND ($4, 0)) == STRING_CST)
1887 || TREE_CODE ($4) == STRING_CST)
1888 expand_asm ($4);
1889 else
1890 error ("argument of `asm' is not a constant string"); }
1891 /* This is the case with just output operands. */
1892 | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ')' ';'
1893 { stmt_count++;
1894 emit_line_note ($<filename>-1, $<lineno>0);
1895 c_expand_asm_operands ($4, $6, NULL_TREE, NULL_TREE,
1896 $2 == ridpointers[(int)RID_VOLATILE],
1897 input_filename, lineno); }
1898 /* This is the case with input operands as well. */
1899 | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ':' asm_operands ')' ';'
1900 { stmt_count++;
1901 emit_line_note ($<filename>-1, $<lineno>0);
1902 c_expand_asm_operands ($4, $6, $8, NULL_TREE,
1903 $2 == ridpointers[(int)RID_VOLATILE],
1904 input_filename, lineno); }
1905 /* This is the case with clobbered registers as well. */
1906 | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ':'
1907 asm_operands ':' asm_clobbers ')' ';'
1908 { stmt_count++;
1909 emit_line_note ($<filename>-1, $<lineno>0);
1910 c_expand_asm_operands ($4, $6, $8, $10,
1911 $2 == ridpointers[(int)RID_VOLATILE],
1912 input_filename, lineno); }
1913 | GOTO identifier ';'
1914 { tree decl;
1915 stmt_count++;
1916 emit_line_note ($<filename>-1, $<lineno>0);
1917 decl = lookup_label ($2);
1918 if (decl != 0)
1919 {
1920 TREE_USED (decl) = 1;
1921 expand_goto (decl);
1922 }
1923 }
1924 | GOTO '*' expr ';'
1925 { if (pedantic)
1926 pedwarn ("ANSI C forbids `goto *expr;'");
1927 stmt_count++;
1928 emit_line_note ($<filename>-1, $<lineno>0);
1929 expand_computed_goto (convert (ptr_type_node, $3)); }
1930 | ';'
1931 ;
1932
1933 all_iter_stmt:
1934 all_iter_stmt_simple
1935 /* | all_iter_stmt_with_decl */
1936 ;
1937
1938 all_iter_stmt_simple:
1939 FOR '(' primary ')'
1940 {
1941 /* The value returned by this action is */
1942 /* 1 if everything is OK */
1943 /* 0 in case of error or already bound iterator */
1944
1945 $<itype>$ = 0;
1946 if (TREE_CODE ($3) != VAR_DECL)
1947 error ("invalid `for (ITERATOR)' syntax");
1948 else if (! ITERATOR_P ($3))
1949 error ("`%s' is not an iterator",
1950 IDENTIFIER_POINTER (DECL_NAME ($3)));
1951 else if (ITERATOR_BOUND_P ($3))
1952 error ("`for (%s)' inside expansion of same iterator",
1953 IDENTIFIER_POINTER (DECL_NAME ($3)));
1954 else
1955 {
1956 $<itype>$ = 1;
1957 iterator_for_loop_start ($3);
1958 }
1959 }
1960 lineno_labeled_stmt
1961 {
1962 if ($<itype>5)
1963 iterator_for_loop_end ($3);
1964 }
1965
1966 /* This really should allow any kind of declaration,
1967 for generality. Fix it before turning it back on.
1968
1969 all_iter_stmt_with_decl:
1970 FOR '(' ITERATOR pushlevel setspecs iterator_spec ')'
1971 {
1972 */ /* The value returned by this action is */
1973 /* 1 if everything is OK */
1974 /* 0 in case of error or already bound iterator */
1975 /*
1976 iterator_for_loop_start ($6);
1977 }
1978 lineno_labeled_stmt
1979 {
1980 iterator_for_loop_end ($6);
1981 emit_line_note (input_filename, lineno);
1982 expand_end_bindings (getdecls (), 1, 0);
1983 $<ttype>$ = poplevel (1, 1, 0);
1984 if (yychar == CONSTANT || yychar == STRING)
1985 pop_momentary_nofree ();
1986 else
1987 pop_momentary ();
1988 }
1989 */
1990
1991 /* Any kind of label, including jump labels and case labels.
1992 ANSI C accepts labels only before statements, but we allow them
1993 also at the end of a compound statement. */
1994
1995 label: CASE expr_no_commas ':'
1996 { register tree value = check_case_value ($2);
1997 register tree label
1998 = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
1999
2000 stmt_count++;
2001
2002 if (value != error_mark_node)
2003 {
2004 tree duplicate;
2005 int success;
2006
2007 if (pedantic && ! INTEGRAL_TYPE_P (TREE_TYPE (value)))
2008 pedwarn ("label must have integral type in ANSI C");
2009
2010 success = pushcase (value, convert_and_check,
2011 label, &duplicate);
2012
2013 if (success == 1)
2014 error ("case label not within a switch statement");
2015 else if (success == 2)
2016 {
2017 error ("duplicate case value");
2018 error_with_decl (duplicate, "this is the first entry for that value");
2019 }
2020 else if (success == 3)
2021 warning ("case value out of range");
2022 else if (success == 5)
2023 error ("case label within scope of cleanup or variable array");
2024 }
2025 position_after_white_space (); }
2026 | CASE expr_no_commas ELLIPSIS expr_no_commas ':'
2027 { register tree value1 = check_case_value ($2);
2028 register tree value2 = check_case_value ($4);
2029 register tree label
2030 = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2031
2032 if (pedantic)
2033 pedwarn ("ANSI C forbids case ranges");
2034 stmt_count++;
2035
2036 if (value1 != error_mark_node && value2 != error_mark_node)
2037 {
2038 tree duplicate;
2039 int success = pushcase_range (value1, value2,
2040 convert_and_check, label,
2041 &duplicate);
2042 if (success == 1)
2043 error ("case label not within a switch statement");
2044 else if (success == 2)
2045 {
2046 error ("duplicate case value");
2047 error_with_decl (duplicate, "this is the first entry for that value");
2048 }
2049 else if (success == 3)
2050 warning ("case value out of range");
2051 else if (success == 4)
2052 warning ("empty case range");
2053 else if (success == 5)
2054 error ("case label within scope of cleanup or variable array");
2055 }
2056 position_after_white_space (); }
2057 | DEFAULT ':'
2058 {
2059 tree duplicate;
2060 register tree label
2061 = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2062 int success = pushcase (NULL_TREE, 0, label, &duplicate);
2063 stmt_count++;
2064 if (success == 1)
2065 error ("default label not within a switch statement");
2066 else if (success == 2)
2067 {
2068 error ("multiple default labels in one switch");
2069 error_with_decl (duplicate, "this is the first default label");
2070 }
2071 position_after_white_space (); }
2072 | identifier ':' maybe_attribute
2073 { tree label = define_label (input_filename, lineno, $1);
2074 stmt_count++;
2075 emit_nop ();
2076 if (label)
2077 {
2078 expand_label (label);
2079 decl_attributes (label, $3, NULL_TREE);
2080 }
2081 position_after_white_space (); }
2082 ;
2083
2084 /* Either a type-qualifier or nothing. First thing in an `asm' statement. */
2085
2086 maybe_type_qual:
2087 /* empty */
2088 { emit_line_note (input_filename, lineno);
2089 $$ = NULL_TREE; }
2090 | TYPE_QUAL
2091 { emit_line_note (input_filename, lineno); }
2092 ;
2093
2094 xexpr:
2095 /* empty */
2096 { $$ = NULL_TREE; }
2097 | expr
2098 ;
2099
2100 /* These are the operands other than the first string and colon
2101 in asm ("addextend %2,%1": "=dm" (x), "0" (y), "g" (*x)) */
2102 asm_operands: /* empty */
2103 { $$ = NULL_TREE; }
2104 | nonnull_asm_operands
2105 ;
2106
2107 nonnull_asm_operands:
2108 asm_operand
2109 | nonnull_asm_operands ',' asm_operand
2110 { $$ = chainon ($1, $3); }
2111 ;
2112
2113 asm_operand:
2114 STRING '(' expr ')'
2115 { $$ = build_tree_list ($1, $3); }
2116 ;
2117
2118 asm_clobbers:
2119 string
2120 { $$ = tree_cons (NULL_TREE, combine_strings ($1), NULL_TREE); }
2121 | asm_clobbers ',' string
2122 { $$ = tree_cons (NULL_TREE, combine_strings ($3), $1); }
2123 ;
2124 \f
2125 /* This is what appears inside the parens in a function declarator.
2126 Its value is a list of ..._TYPE nodes. */
2127 parmlist:
2128 { pushlevel (0);
2129 clear_parm_order ();
2130 declare_parm_level (0); }
2131 parmlist_1
2132 { $$ = $2;
2133 parmlist_tags_warning ();
2134 poplevel (0, 0, 0); }
2135 ;
2136
2137 parmlist_1:
2138 parmlist_2 ')'
2139 | parms ';'
2140 { tree parm;
2141 if (pedantic)
2142 pedwarn ("ANSI C forbids forward parameter declarations");
2143 /* Mark the forward decls as such. */
2144 for (parm = getdecls (); parm; parm = TREE_CHAIN (parm))
2145 TREE_ASM_WRITTEN (parm) = 1;
2146 clear_parm_order (); }
2147 parmlist_1
2148 { $$ = $4; }
2149 | error ')'
2150 { $$ = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); }
2151 ;
2152
2153 /* This is what appears inside the parens in a function declarator.
2154 Is value is represented in the format that grokdeclarator expects. */
2155 parmlist_2: /* empty */
2156 { $$ = get_parm_info (0); }
2157 | ELLIPSIS
2158 { $$ = get_parm_info (0);
2159 /* Gcc used to allow this as an extension. However, it does
2160 not work for all targets, and thus has been disabled.
2161 Also, since func (...) and func () are indistinguishable,
2162 it caused problems with the code in expand_builtin which
2163 tries to verify that BUILT_IN_NEXT_ARG is being used
2164 correctly. */
2165 error ("ANSI C requires a named argument before `...'");
2166 }
2167 | parms
2168 { $$ = get_parm_info (1); }
2169 | parms ',' ELLIPSIS
2170 { $$ = get_parm_info (0); }
2171 ;
2172
2173 parms:
2174 parm
2175 { push_parm_decl ($1); }
2176 | parms ',' parm
2177 { push_parm_decl ($3); }
2178 ;
2179
2180 /* A single parameter declaration or parameter type name,
2181 as found in a parmlist. */
2182 parm:
2183 typed_declspecs setspecs parm_declarator maybe_attribute
2184 { $$ = build_tree_list (build_tree_list (current_declspecs,
2185 $3),
2186 build_tree_list (prefix_attributes,
2187 $4));
2188 current_declspecs = TREE_VALUE (declspec_stack);
2189 prefix_attributes = TREE_PURPOSE (declspec_stack);
2190 declspec_stack = TREE_CHAIN (declspec_stack);
2191 resume_momentary ($2); }
2192 | typed_declspecs setspecs notype_declarator maybe_attribute
2193 { $$ = build_tree_list (build_tree_list (current_declspecs,
2194 $3),
2195 build_tree_list (prefix_attributes,
2196 $4));
2197 current_declspecs = TREE_VALUE (declspec_stack);
2198 prefix_attributes = TREE_PURPOSE (declspec_stack);
2199 declspec_stack = TREE_CHAIN (declspec_stack);
2200 resume_momentary ($2); }
2201 | typed_declspecs setspecs absdcl maybe_attribute
2202 { $$ = build_tree_list (build_tree_list (current_declspecs,
2203 $3),
2204 build_tree_list (prefix_attributes,
2205 $4));
2206 current_declspecs = TREE_VALUE (declspec_stack);
2207 prefix_attributes = TREE_PURPOSE (declspec_stack);
2208 declspec_stack = TREE_CHAIN (declspec_stack);
2209 resume_momentary ($2); }
2210 | declmods setspecs notype_declarator maybe_attribute
2211 { $$ = build_tree_list (build_tree_list (current_declspecs,
2212 $3),
2213 build_tree_list (prefix_attributes,
2214 $4));
2215 current_declspecs = TREE_VALUE (declspec_stack);
2216 prefix_attributes = TREE_PURPOSE (declspec_stack);
2217 declspec_stack = TREE_CHAIN (declspec_stack);
2218 resume_momentary ($2); }
2219
2220 | declmods setspecs absdcl maybe_attribute
2221 { $$ = build_tree_list (build_tree_list (current_declspecs,
2222 $3),
2223 build_tree_list (prefix_attributes,
2224 $4));
2225 current_declspecs = TREE_VALUE (declspec_stack);
2226 prefix_attributes = TREE_PURPOSE (declspec_stack);
2227 declspec_stack = TREE_CHAIN (declspec_stack);
2228 resume_momentary ($2); }
2229 ;
2230
2231 /* This is used in a function definition
2232 where either a parmlist or an identifier list is ok.
2233 Its value is a list of ..._TYPE nodes or a list of identifiers. */
2234 parmlist_or_identifiers:
2235 { pushlevel (0);
2236 clear_parm_order ();
2237 declare_parm_level (1); }
2238 parmlist_or_identifiers_1
2239 { $$ = $2;
2240 parmlist_tags_warning ();
2241 poplevel (0, 0, 0); }
2242 ;
2243
2244 parmlist_or_identifiers_1:
2245 parmlist_1
2246 | identifiers ')'
2247 { tree t;
2248 for (t = $1; t; t = TREE_CHAIN (t))
2249 if (TREE_VALUE (t) == NULL_TREE)
2250 error ("`...' in old-style identifier list");
2251 $$ = tree_cons (NULL_TREE, NULL_TREE, $1); }
2252 ;
2253
2254 /* A nonempty list of identifiers. */
2255 identifiers:
2256 IDENTIFIER
2257 { $$ = build_tree_list (NULL_TREE, $1); }
2258 | identifiers ',' IDENTIFIER
2259 { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
2260 ;
2261
2262 /* A nonempty list of identifiers, including typenames. */
2263 identifiers_or_typenames:
2264 identifier
2265 { $$ = build_tree_list (NULL_TREE, $1); }
2266 | identifiers_or_typenames ',' identifier
2267 { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
2268 ;
2269
2270 extension:
2271 EXTENSION
2272 { $$ = SAVE_WARN_FLAGS();
2273 pedantic = 0;
2274 warn_pointer_arith = 0; }
2275 ;
2276 \f
2277 %%
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