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1 /* YACC parser for C expressions, for GDB.
2 Copyright (C) 1986-2018 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19 /* Parse a C expression from text in a string,
20 and return the result as a struct expression pointer.
21 That structure contains arithmetic operations in reverse polish,
22 with constants represented by operations that are followed by special data.
23 See expression.h for the details of the format.
24 What is important here is that it can be built up sequentially
25 during the process of parsing; the lower levels of the tree always
26 come first in the result.
27
28 Note that malloc's and realloc's in this file are transformed to
29 xmalloc and xrealloc respectively by the same sed command in the
30 makefile that remaps any other malloc/realloc inserted by the parser
31 generator. Doing this with #defines and trying to control the interaction
32 with include files (<malloc.h> and <stdlib.h> for example) just became
33 too messy, particularly when such includes can be inserted at random
34 times by the parser generator. */
35
36 %{
37
38 #include "defs.h"
39 #include <ctype.h>
40 #include "expression.h"
41 #include "value.h"
42 #include "parser-defs.h"
43 #include "language.h"
44 #include "c-lang.h"
45 #include "bfd.h" /* Required by objfiles.h. */
46 #include "symfile.h" /* Required by objfiles.h. */
47 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
48 #include "charset.h"
49 #include "block.h"
50 #include "cp-support.h"
51 #include "macroscope.h"
52 #include "objc-lang.h"
53 #include "typeprint.h"
54 #include "cp-abi.h"
55
56 #define parse_type(ps) builtin_type (parse_gdbarch (ps))
57
58 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
59 etc). */
60 #define GDB_YY_REMAP_PREFIX c_
61 #include "yy-remap.h"
62
63 /* The state of the parser, used internally when we are parsing the
64 expression. */
65
66 static struct parser_state *pstate = NULL;
67
68 int yyparse (void);
69
70 static int yylex (void);
71
72 void yyerror (const char *);
73
74 static int type_aggregate_p (struct type *);
75
76 %}
77
78 /* Although the yacc "value" of an expression is not used,
79 since the result is stored in the structure being created,
80 other node types do have values. */
81
82 %union
83 {
84 LONGEST lval;
85 struct {
86 LONGEST val;
87 struct type *type;
88 } typed_val_int;
89 struct {
90 gdb_byte val[16];
91 struct type *type;
92 } typed_val_float;
93 struct type *tval;
94 struct stoken sval;
95 struct typed_stoken tsval;
96 struct ttype tsym;
97 struct symtoken ssym;
98 int voidval;
99 const struct block *bval;
100 enum exp_opcode opcode;
101
102 struct stoken_vector svec;
103 VEC (type_ptr) *tvec;
104
105 struct type_stack *type_stack;
106
107 struct objc_class_str theclass;
108 }
109
110 %{
111 /* YYSTYPE gets defined by %union */
112 static int parse_number (struct parser_state *par_state,
113 const char *, int, int, YYSTYPE *);
114 static struct stoken operator_stoken (const char *);
115 static void check_parameter_typelist (VEC (type_ptr) *);
116 static void write_destructor_name (struct parser_state *par_state,
117 struct stoken);
118
119 #ifdef YYBISON
120 static void c_print_token (FILE *file, int type, YYSTYPE value);
121 #define YYPRINT(FILE, TYPE, VALUE) c_print_token (FILE, TYPE, VALUE)
122 #endif
123 %}
124
125 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly function_method
126 %type <lval> rcurly
127 %type <tval> type typebase
128 %type <tvec> nonempty_typelist func_mod parameter_typelist
129 /* %type <bval> block */
130
131 /* Fancy type parsing. */
132 %type <tval> ptype
133 %type <lval> array_mod
134 %type <tval> conversion_type_id
135
136 %type <type_stack> ptr_operator_ts abs_decl direct_abs_decl
137
138 %token <typed_val_int> INT
139 %token <typed_val_float> FLOAT
140
141 /* Both NAME and TYPENAME tokens represent symbols in the input,
142 and both convey their data as strings.
143 But a TYPENAME is a string that happens to be defined as a typedef
144 or builtin type name (such as int or char)
145 and a NAME is any other symbol.
146 Contexts where this distinction is not important can use the
147 nonterminal "name", which matches either NAME or TYPENAME. */
148
149 %token <tsval> STRING
150 %token <sval> NSSTRING /* ObjC Foundation "NSString" literal */
151 %token SELECTOR /* ObjC "@selector" pseudo-operator */
152 %token <tsval> CHAR
153 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
154 %token <ssym> UNKNOWN_CPP_NAME
155 %token <voidval> COMPLETE
156 %token <tsym> TYPENAME
157 %token <theclass> CLASSNAME /* ObjC Class name */
158 %type <sval> name
159 %type <svec> string_exp
160 %type <ssym> name_not_typename
161 %type <tsym> type_name
162
163 /* This is like a '[' token, but is only generated when parsing
164 Objective C. This lets us reuse the same parser without
165 erroneously parsing ObjC-specific expressions in C. */
166 %token OBJC_LBRAC
167
168 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
169 but which would parse as a valid number in the current input radix.
170 E.g. "c" when input_radix==16. Depending on the parse, it will be
171 turned into a name or into a number. */
172
173 %token <ssym> NAME_OR_INT
174
175 %token OPERATOR
176 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
177 %token TEMPLATE
178 %token ERROR
179 %token NEW DELETE
180 %type <sval> oper
181 %token REINTERPRET_CAST DYNAMIC_CAST STATIC_CAST CONST_CAST
182 %token ENTRY
183 %token TYPEOF
184 %token DECLTYPE
185 %token TYPEID
186
187 /* Special type cases, put in to allow the parser to distinguish different
188 legal basetypes. */
189 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
190
191 %token <sval> VARIABLE
192
193 %token <opcode> ASSIGN_MODIFY
194
195 /* C++ */
196 %token TRUEKEYWORD
197 %token FALSEKEYWORD
198
199
200 %left ','
201 %left ABOVE_COMMA
202 %right '=' ASSIGN_MODIFY
203 %right '?'
204 %left OROR
205 %left ANDAND
206 %left '|'
207 %left '^'
208 %left '&'
209 %left EQUAL NOTEQUAL
210 %left '<' '>' LEQ GEQ
211 %left LSH RSH
212 %left '@'
213 %left '+' '-'
214 %left '*' '/' '%'
215 %right UNARY INCREMENT DECREMENT
216 %right ARROW ARROW_STAR '.' DOT_STAR '[' OBJC_LBRAC '('
217 %token <ssym> BLOCKNAME
218 %token <bval> FILENAME
219 %type <bval> block
220 %left COLONCOLON
221
222 %token DOTDOTDOT
223
224 \f
225 %%
226
227 start : exp1
228 | type_exp
229 ;
230
231 type_exp: type
232 { write_exp_elt_opcode(pstate, OP_TYPE);
233 write_exp_elt_type(pstate, $1);
234 write_exp_elt_opcode(pstate, OP_TYPE);}
235 | TYPEOF '(' exp ')'
236 {
237 write_exp_elt_opcode (pstate, OP_TYPEOF);
238 }
239 | TYPEOF '(' type ')'
240 {
241 write_exp_elt_opcode (pstate, OP_TYPE);
242 write_exp_elt_type (pstate, $3);
243 write_exp_elt_opcode (pstate, OP_TYPE);
244 }
245 | DECLTYPE '(' exp ')'
246 {
247 write_exp_elt_opcode (pstate, OP_DECLTYPE);
248 }
249 ;
250
251 /* Expressions, including the comma operator. */
252 exp1 : exp
253 | exp1 ',' exp
254 { write_exp_elt_opcode (pstate, BINOP_COMMA); }
255 ;
256
257 /* Expressions, not including the comma operator. */
258 exp : '*' exp %prec UNARY
259 { write_exp_elt_opcode (pstate, UNOP_IND); }
260 ;
261
262 exp : '&' exp %prec UNARY
263 { write_exp_elt_opcode (pstate, UNOP_ADDR); }
264 ;
265
266 exp : '-' exp %prec UNARY
267 { write_exp_elt_opcode (pstate, UNOP_NEG); }
268 ;
269
270 exp : '+' exp %prec UNARY
271 { write_exp_elt_opcode (pstate, UNOP_PLUS); }
272 ;
273
274 exp : '!' exp %prec UNARY
275 { write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
276 ;
277
278 exp : '~' exp %prec UNARY
279 { write_exp_elt_opcode (pstate, UNOP_COMPLEMENT); }
280 ;
281
282 exp : INCREMENT exp %prec UNARY
283 { write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
284 ;
285
286 exp : DECREMENT exp %prec UNARY
287 { write_exp_elt_opcode (pstate, UNOP_PREDECREMENT); }
288 ;
289
290 exp : exp INCREMENT %prec UNARY
291 { write_exp_elt_opcode (pstate, UNOP_POSTINCREMENT); }
292 ;
293
294 exp : exp DECREMENT %prec UNARY
295 { write_exp_elt_opcode (pstate, UNOP_POSTDECREMENT); }
296 ;
297
298 exp : TYPEID '(' exp ')' %prec UNARY
299 { write_exp_elt_opcode (pstate, OP_TYPEID); }
300 ;
301
302 exp : TYPEID '(' type_exp ')' %prec UNARY
303 { write_exp_elt_opcode (pstate, OP_TYPEID); }
304 ;
305
306 exp : SIZEOF exp %prec UNARY
307 { write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
308 ;
309
310 exp : exp ARROW name
311 { write_exp_elt_opcode (pstate, STRUCTOP_PTR);
312 write_exp_string (pstate, $3);
313 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
314 ;
315
316 exp : exp ARROW name COMPLETE
317 { mark_struct_expression (pstate);
318 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
319 write_exp_string (pstate, $3);
320 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
321 ;
322
323 exp : exp ARROW COMPLETE
324 { struct stoken s;
325 mark_struct_expression (pstate);
326 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
327 s.ptr = "";
328 s.length = 0;
329 write_exp_string (pstate, s);
330 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
331 ;
332
333 exp : exp ARROW '~' name
334 { write_exp_elt_opcode (pstate, STRUCTOP_PTR);
335 write_destructor_name (pstate, $4);
336 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
337 ;
338
339 exp : exp ARROW '~' name COMPLETE
340 { mark_struct_expression (pstate);
341 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
342 write_destructor_name (pstate, $4);
343 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
344 ;
345
346 exp : exp ARROW qualified_name
347 { /* exp->type::name becomes exp->*(&type::name) */
348 /* Note: this doesn't work if name is a
349 static member! FIXME */
350 write_exp_elt_opcode (pstate, UNOP_ADDR);
351 write_exp_elt_opcode (pstate, STRUCTOP_MPTR); }
352 ;
353
354 exp : exp ARROW_STAR exp
355 { write_exp_elt_opcode (pstate, STRUCTOP_MPTR); }
356 ;
357
358 exp : exp '.' name
359 { write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
360 write_exp_string (pstate, $3);
361 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
362 ;
363
364 exp : exp '.' name COMPLETE
365 { mark_struct_expression (pstate);
366 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
367 write_exp_string (pstate, $3);
368 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
369 ;
370
371 exp : exp '.' COMPLETE
372 { struct stoken s;
373 mark_struct_expression (pstate);
374 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
375 s.ptr = "";
376 s.length = 0;
377 write_exp_string (pstate, s);
378 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
379 ;
380
381 exp : exp '.' '~' name
382 { write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
383 write_destructor_name (pstate, $4);
384 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
385 ;
386
387 exp : exp '.' '~' name COMPLETE
388 { mark_struct_expression (pstate);
389 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
390 write_destructor_name (pstate, $4);
391 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
392 ;
393
394 exp : exp '.' qualified_name
395 { /* exp.type::name becomes exp.*(&type::name) */
396 /* Note: this doesn't work if name is a
397 static member! FIXME */
398 write_exp_elt_opcode (pstate, UNOP_ADDR);
399 write_exp_elt_opcode (pstate, STRUCTOP_MEMBER); }
400 ;
401
402 exp : exp DOT_STAR exp
403 { write_exp_elt_opcode (pstate, STRUCTOP_MEMBER); }
404 ;
405
406 exp : exp '[' exp1 ']'
407 { write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
408 ;
409
410 exp : exp OBJC_LBRAC exp1 ']'
411 { write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
412 ;
413
414 /*
415 * The rules below parse ObjC message calls of the form:
416 * '[' target selector {':' argument}* ']'
417 */
418
419 exp : OBJC_LBRAC TYPENAME
420 {
421 CORE_ADDR theclass;
422
423 theclass = lookup_objc_class (parse_gdbarch (pstate),
424 copy_name ($2.stoken));
425 if (theclass == 0)
426 error (_("%s is not an ObjC Class"),
427 copy_name ($2.stoken));
428 write_exp_elt_opcode (pstate, OP_LONG);
429 write_exp_elt_type (pstate,
430 parse_type (pstate)->builtin_int);
431 write_exp_elt_longcst (pstate, (LONGEST) theclass);
432 write_exp_elt_opcode (pstate, OP_LONG);
433 start_msglist();
434 }
435 msglist ']'
436 { write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
437 end_msglist (pstate);
438 write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
439 }
440 ;
441
442 exp : OBJC_LBRAC CLASSNAME
443 {
444 write_exp_elt_opcode (pstate, OP_LONG);
445 write_exp_elt_type (pstate,
446 parse_type (pstate)->builtin_int);
447 write_exp_elt_longcst (pstate, (LONGEST) $2.theclass);
448 write_exp_elt_opcode (pstate, OP_LONG);
449 start_msglist();
450 }
451 msglist ']'
452 { write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
453 end_msglist (pstate);
454 write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
455 }
456 ;
457
458 exp : OBJC_LBRAC exp
459 { start_msglist(); }
460 msglist ']'
461 { write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
462 end_msglist (pstate);
463 write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
464 }
465 ;
466
467 msglist : name
468 { add_msglist(&$1, 0); }
469 | msgarglist
470 ;
471
472 msgarglist : msgarg
473 | msgarglist msgarg
474 ;
475
476 msgarg : name ':' exp
477 { add_msglist(&$1, 1); }
478 | ':' exp /* Unnamed arg. */
479 { add_msglist(0, 1); }
480 | ',' exp /* Variable number of args. */
481 { add_msglist(0, 0); }
482 ;
483
484 exp : exp '('
485 /* This is to save the value of arglist_len
486 being accumulated by an outer function call. */
487 { start_arglist (); }
488 arglist ')' %prec ARROW
489 { write_exp_elt_opcode (pstate, OP_FUNCALL);
490 write_exp_elt_longcst (pstate,
491 (LONGEST) end_arglist ());
492 write_exp_elt_opcode (pstate, OP_FUNCALL); }
493 ;
494
495 /* This is here to disambiguate with the production for
496 "func()::static_var" further below, which uses
497 function_method_void. */
498 exp : exp '(' ')' %prec ARROW
499 { start_arglist ();
500 write_exp_elt_opcode (pstate, OP_FUNCALL);
501 write_exp_elt_longcst (pstate,
502 (LONGEST) end_arglist ());
503 write_exp_elt_opcode (pstate, OP_FUNCALL); }
504 ;
505
506
507 exp : UNKNOWN_CPP_NAME '('
508 {
509 /* This could potentially be a an argument defined
510 lookup function (Koenig). */
511 write_exp_elt_opcode (pstate, OP_ADL_FUNC);
512 write_exp_elt_block (pstate,
513 expression_context_block);
514 write_exp_elt_sym (pstate,
515 NULL); /* Placeholder. */
516 write_exp_string (pstate, $1.stoken);
517 write_exp_elt_opcode (pstate, OP_ADL_FUNC);
518
519 /* This is to save the value of arglist_len
520 being accumulated by an outer function call. */
521
522 start_arglist ();
523 }
524 arglist ')' %prec ARROW
525 {
526 write_exp_elt_opcode (pstate, OP_FUNCALL);
527 write_exp_elt_longcst (pstate,
528 (LONGEST) end_arglist ());
529 write_exp_elt_opcode (pstate, OP_FUNCALL);
530 }
531 ;
532
533 lcurly : '{'
534 { start_arglist (); }
535 ;
536
537 arglist :
538 ;
539
540 arglist : exp
541 { arglist_len = 1; }
542 ;
543
544 arglist : arglist ',' exp %prec ABOVE_COMMA
545 { arglist_len++; }
546 ;
547
548 function_method: exp '(' parameter_typelist ')' const_or_volatile
549 { int i;
550 VEC (type_ptr) *type_list = $3;
551 struct type *type_elt;
552 LONGEST len = VEC_length (type_ptr, type_list);
553
554 write_exp_elt_opcode (pstate, TYPE_INSTANCE);
555 /* Save the const/volatile qualifiers as
556 recorded by the const_or_volatile
557 production's actions. */
558 write_exp_elt_longcst (pstate,
559 follow_type_instance_flags ());
560 write_exp_elt_longcst (pstate, len);
561 for (i = 0;
562 VEC_iterate (type_ptr, type_list, i, type_elt);
563 ++i)
564 write_exp_elt_type (pstate, type_elt);
565 write_exp_elt_longcst(pstate, len);
566 write_exp_elt_opcode (pstate, TYPE_INSTANCE);
567 VEC_free (type_ptr, type_list);
568 }
569 ;
570
571 function_method_void: exp '(' ')' const_or_volatile
572 { write_exp_elt_opcode (pstate, TYPE_INSTANCE);
573 /* See above. */
574 write_exp_elt_longcst (pstate,
575 follow_type_instance_flags ());
576 write_exp_elt_longcst (pstate, 0);
577 write_exp_elt_longcst (pstate, 0);
578 write_exp_elt_opcode (pstate, TYPE_INSTANCE);
579 }
580 ;
581
582 exp : function_method
583 ;
584
585 /* Normally we must interpret "func()" as a function call, instead of
586 a type. The user needs to write func(void) to disambiguate.
587 However, in the "func()::static_var" case, there's no
588 ambiguity. */
589 function_method_void_or_typelist: function_method
590 | function_method_void
591 ;
592
593 exp : function_method_void_or_typelist COLONCOLON name
594 {
595 write_exp_elt_opcode (pstate, OP_FUNC_STATIC_VAR);
596 write_exp_string (pstate, $3);
597 write_exp_elt_opcode (pstate, OP_FUNC_STATIC_VAR);
598 }
599 ;
600
601 rcurly : '}'
602 { $$ = end_arglist () - 1; }
603 ;
604 exp : lcurly arglist rcurly %prec ARROW
605 { write_exp_elt_opcode (pstate, OP_ARRAY);
606 write_exp_elt_longcst (pstate, (LONGEST) 0);
607 write_exp_elt_longcst (pstate, (LONGEST) $3);
608 write_exp_elt_opcode (pstate, OP_ARRAY); }
609 ;
610
611 exp : lcurly type_exp rcurly exp %prec UNARY
612 { write_exp_elt_opcode (pstate, UNOP_MEMVAL_TYPE); }
613 ;
614
615 exp : '(' type_exp ')' exp %prec UNARY
616 { write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
617 ;
618
619 exp : '(' exp1 ')'
620 { }
621 ;
622
623 /* Binary operators in order of decreasing precedence. */
624
625 exp : exp '@' exp
626 { write_exp_elt_opcode (pstate, BINOP_REPEAT); }
627 ;
628
629 exp : exp '*' exp
630 { write_exp_elt_opcode (pstate, BINOP_MUL); }
631 ;
632
633 exp : exp '/' exp
634 { write_exp_elt_opcode (pstate, BINOP_DIV); }
635 ;
636
637 exp : exp '%' exp
638 { write_exp_elt_opcode (pstate, BINOP_REM); }
639 ;
640
641 exp : exp '+' exp
642 { write_exp_elt_opcode (pstate, BINOP_ADD); }
643 ;
644
645 exp : exp '-' exp
646 { write_exp_elt_opcode (pstate, BINOP_SUB); }
647 ;
648
649 exp : exp LSH exp
650 { write_exp_elt_opcode (pstate, BINOP_LSH); }
651 ;
652
653 exp : exp RSH exp
654 { write_exp_elt_opcode (pstate, BINOP_RSH); }
655 ;
656
657 exp : exp EQUAL exp
658 { write_exp_elt_opcode (pstate, BINOP_EQUAL); }
659 ;
660
661 exp : exp NOTEQUAL exp
662 { write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
663 ;
664
665 exp : exp LEQ exp
666 { write_exp_elt_opcode (pstate, BINOP_LEQ); }
667 ;
668
669 exp : exp GEQ exp
670 { write_exp_elt_opcode (pstate, BINOP_GEQ); }
671 ;
672
673 exp : exp '<' exp
674 { write_exp_elt_opcode (pstate, BINOP_LESS); }
675 ;
676
677 exp : exp '>' exp
678 { write_exp_elt_opcode (pstate, BINOP_GTR); }
679 ;
680
681 exp : exp '&' exp
682 { write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
683 ;
684
685 exp : exp '^' exp
686 { write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
687 ;
688
689 exp : exp '|' exp
690 { write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
691 ;
692
693 exp : exp ANDAND exp
694 { write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
695 ;
696
697 exp : exp OROR exp
698 { write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
699 ;
700
701 exp : exp '?' exp ':' exp %prec '?'
702 { write_exp_elt_opcode (pstate, TERNOP_COND); }
703 ;
704
705 exp : exp '=' exp
706 { write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
707 ;
708
709 exp : exp ASSIGN_MODIFY exp
710 { write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
711 write_exp_elt_opcode (pstate, $2);
712 write_exp_elt_opcode (pstate,
713 BINOP_ASSIGN_MODIFY); }
714 ;
715
716 exp : INT
717 { write_exp_elt_opcode (pstate, OP_LONG);
718 write_exp_elt_type (pstate, $1.type);
719 write_exp_elt_longcst (pstate, (LONGEST) ($1.val));
720 write_exp_elt_opcode (pstate, OP_LONG); }
721 ;
722
723 exp : CHAR
724 {
725 struct stoken_vector vec;
726 vec.len = 1;
727 vec.tokens = &$1;
728 write_exp_string_vector (pstate, $1.type, &vec);
729 }
730 ;
731
732 exp : NAME_OR_INT
733 { YYSTYPE val;
734 parse_number (pstate, $1.stoken.ptr,
735 $1.stoken.length, 0, &val);
736 write_exp_elt_opcode (pstate, OP_LONG);
737 write_exp_elt_type (pstate, val.typed_val_int.type);
738 write_exp_elt_longcst (pstate,
739 (LONGEST) val.typed_val_int.val);
740 write_exp_elt_opcode (pstate, OP_LONG);
741 }
742 ;
743
744
745 exp : FLOAT
746 { write_exp_elt_opcode (pstate, OP_FLOAT);
747 write_exp_elt_type (pstate, $1.type);
748 write_exp_elt_floatcst (pstate, $1.val);
749 write_exp_elt_opcode (pstate, OP_FLOAT); }
750 ;
751
752 exp : variable
753 ;
754
755 exp : VARIABLE
756 {
757 write_dollar_variable (pstate, $1);
758 }
759 ;
760
761 exp : SELECTOR '(' name ')'
762 {
763 write_exp_elt_opcode (pstate, OP_OBJC_SELECTOR);
764 write_exp_string (pstate, $3);
765 write_exp_elt_opcode (pstate, OP_OBJC_SELECTOR); }
766 ;
767
768 exp : SIZEOF '(' type ')' %prec UNARY
769 { struct type *type = $3;
770 write_exp_elt_opcode (pstate, OP_LONG);
771 write_exp_elt_type (pstate, lookup_signed_typename
772 (parse_language (pstate),
773 parse_gdbarch (pstate),
774 "int"));
775 type = check_typedef (type);
776
777 /* $5.3.3/2 of the C++ Standard (n3290 draft)
778 says of sizeof: "When applied to a reference
779 or a reference type, the result is the size of
780 the referenced type." */
781 if (TYPE_IS_REFERENCE (type))
782 type = check_typedef (TYPE_TARGET_TYPE (type));
783 write_exp_elt_longcst (pstate,
784 (LONGEST) TYPE_LENGTH (type));
785 write_exp_elt_opcode (pstate, OP_LONG); }
786 ;
787
788 exp : REINTERPRET_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
789 { write_exp_elt_opcode (pstate,
790 UNOP_REINTERPRET_CAST); }
791 ;
792
793 exp : STATIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
794 { write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
795 ;
796
797 exp : DYNAMIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
798 { write_exp_elt_opcode (pstate, UNOP_DYNAMIC_CAST); }
799 ;
800
801 exp : CONST_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
802 { /* We could do more error checking here, but
803 it doesn't seem worthwhile. */
804 write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
805 ;
806
807 string_exp:
808 STRING
809 {
810 /* We copy the string here, and not in the
811 lexer, to guarantee that we do not leak a
812 string. Note that we follow the
813 NUL-termination convention of the
814 lexer. */
815 struct typed_stoken *vec = XNEW (struct typed_stoken);
816 $$.len = 1;
817 $$.tokens = vec;
818
819 vec->type = $1.type;
820 vec->length = $1.length;
821 vec->ptr = (char *) malloc ($1.length + 1);
822 memcpy (vec->ptr, $1.ptr, $1.length + 1);
823 }
824
825 | string_exp STRING
826 {
827 /* Note that we NUL-terminate here, but just
828 for convenience. */
829 char *p;
830 ++$$.len;
831 $$.tokens = XRESIZEVEC (struct typed_stoken,
832 $$.tokens, $$.len);
833
834 p = (char *) malloc ($2.length + 1);
835 memcpy (p, $2.ptr, $2.length + 1);
836
837 $$.tokens[$$.len - 1].type = $2.type;
838 $$.tokens[$$.len - 1].length = $2.length;
839 $$.tokens[$$.len - 1].ptr = p;
840 }
841 ;
842
843 exp : string_exp
844 {
845 int i;
846 c_string_type type = C_STRING;
847
848 for (i = 0; i < $1.len; ++i)
849 {
850 switch ($1.tokens[i].type)
851 {
852 case C_STRING:
853 break;
854 case C_WIDE_STRING:
855 case C_STRING_16:
856 case C_STRING_32:
857 if (type != C_STRING
858 && type != $1.tokens[i].type)
859 error (_("Undefined string concatenation."));
860 type = (enum c_string_type_values) $1.tokens[i].type;
861 break;
862 default:
863 /* internal error */
864 internal_error (__FILE__, __LINE__,
865 "unrecognized type in string concatenation");
866 }
867 }
868
869 write_exp_string_vector (pstate, type, &$1);
870 for (i = 0; i < $1.len; ++i)
871 free ($1.tokens[i].ptr);
872 free ($1.tokens);
873 }
874 ;
875
876 exp : NSSTRING /* ObjC NextStep NSString constant
877 * of the form '@' '"' string '"'.
878 */
879 { write_exp_elt_opcode (pstate, OP_OBJC_NSSTRING);
880 write_exp_string (pstate, $1);
881 write_exp_elt_opcode (pstate, OP_OBJC_NSSTRING); }
882 ;
883
884 /* C++. */
885 exp : TRUEKEYWORD
886 { write_exp_elt_opcode (pstate, OP_LONG);
887 write_exp_elt_type (pstate,
888 parse_type (pstate)->builtin_bool);
889 write_exp_elt_longcst (pstate, (LONGEST) 1);
890 write_exp_elt_opcode (pstate, OP_LONG); }
891 ;
892
893 exp : FALSEKEYWORD
894 { write_exp_elt_opcode (pstate, OP_LONG);
895 write_exp_elt_type (pstate,
896 parse_type (pstate)->builtin_bool);
897 write_exp_elt_longcst (pstate, (LONGEST) 0);
898 write_exp_elt_opcode (pstate, OP_LONG); }
899 ;
900
901 /* end of C++. */
902
903 block : BLOCKNAME
904 {
905 if ($1.sym.symbol)
906 $$ = SYMBOL_BLOCK_VALUE ($1.sym.symbol);
907 else
908 error (_("No file or function \"%s\"."),
909 copy_name ($1.stoken));
910 }
911 | FILENAME
912 {
913 $$ = $1;
914 }
915 ;
916
917 block : block COLONCOLON name
918 { struct symbol *tem
919 = lookup_symbol (copy_name ($3), $1,
920 VAR_DOMAIN, NULL).symbol;
921
922 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
923 error (_("No function \"%s\" in specified context."),
924 copy_name ($3));
925 $$ = SYMBOL_BLOCK_VALUE (tem); }
926 ;
927
928 variable: name_not_typename ENTRY
929 { struct symbol *sym = $1.sym.symbol;
930
931 if (sym == NULL || !SYMBOL_IS_ARGUMENT (sym)
932 || !symbol_read_needs_frame (sym))
933 error (_("@entry can be used only for function "
934 "parameters, not for \"%s\""),
935 copy_name ($1.stoken));
936
937 write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
938 write_exp_elt_sym (pstate, sym);
939 write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
940 }
941 ;
942
943 variable: block COLONCOLON name
944 { struct block_symbol sym
945 = lookup_symbol (copy_name ($3), $1,
946 VAR_DOMAIN, NULL);
947
948 if (sym.symbol == 0)
949 error (_("No symbol \"%s\" in specified context."),
950 copy_name ($3));
951 if (symbol_read_needs_frame (sym.symbol))
952 {
953 if (innermost_block == 0
954 || contained_in (sym.block,
955 innermost_block))
956 innermost_block = sym.block;
957 }
958
959 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
960 write_exp_elt_block (pstate, sym.block);
961 write_exp_elt_sym (pstate, sym.symbol);
962 write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
963 ;
964
965 qualified_name: TYPENAME COLONCOLON name
966 {
967 struct type *type = $1.type;
968 type = check_typedef (type);
969 if (!type_aggregate_p (type))
970 error (_("`%s' is not defined as an aggregate type."),
971 TYPE_SAFE_NAME (type));
972
973 write_exp_elt_opcode (pstate, OP_SCOPE);
974 write_exp_elt_type (pstate, type);
975 write_exp_string (pstate, $3);
976 write_exp_elt_opcode (pstate, OP_SCOPE);
977 }
978 | TYPENAME COLONCOLON '~' name
979 {
980 struct type *type = $1.type;
981 struct stoken tmp_token;
982 char *buf;
983
984 type = check_typedef (type);
985 if (!type_aggregate_p (type))
986 error (_("`%s' is not defined as an aggregate type."),
987 TYPE_SAFE_NAME (type));
988 buf = (char *) alloca ($4.length + 2);
989 tmp_token.ptr = buf;
990 tmp_token.length = $4.length + 1;
991 buf[0] = '~';
992 memcpy (buf+1, $4.ptr, $4.length);
993 buf[tmp_token.length] = 0;
994
995 /* Check for valid destructor name. */
996 destructor_name_p (tmp_token.ptr, $1.type);
997 write_exp_elt_opcode (pstate, OP_SCOPE);
998 write_exp_elt_type (pstate, type);
999 write_exp_string (pstate, tmp_token);
1000 write_exp_elt_opcode (pstate, OP_SCOPE);
1001 }
1002 | TYPENAME COLONCOLON name COLONCOLON name
1003 {
1004 char *copy = copy_name ($3);
1005 error (_("No type \"%s\" within class "
1006 "or namespace \"%s\"."),
1007 copy, TYPE_SAFE_NAME ($1.type));
1008 }
1009 ;
1010
1011 variable: qualified_name
1012 | COLONCOLON name_not_typename
1013 {
1014 char *name = copy_name ($2.stoken);
1015 struct symbol *sym;
1016 struct bound_minimal_symbol msymbol;
1017
1018 sym
1019 = lookup_symbol (name, (const struct block *) NULL,
1020 VAR_DOMAIN, NULL).symbol;
1021 if (sym)
1022 {
1023 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1024 write_exp_elt_block (pstate, NULL);
1025 write_exp_elt_sym (pstate, sym);
1026 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1027 break;
1028 }
1029
1030 msymbol = lookup_bound_minimal_symbol (name);
1031 if (msymbol.minsym != NULL)
1032 write_exp_msymbol (pstate, msymbol);
1033 else if (!have_full_symbols () && !have_partial_symbols ())
1034 error (_("No symbol table is loaded. Use the \"file\" command."));
1035 else
1036 error (_("No symbol \"%s\" in current context."), name);
1037 }
1038 ;
1039
1040 variable: name_not_typename
1041 { struct block_symbol sym = $1.sym;
1042
1043 if (sym.symbol)
1044 {
1045 if (symbol_read_needs_frame (sym.symbol))
1046 {
1047 if (innermost_block == 0
1048 || contained_in (sym.block,
1049 innermost_block))
1050 innermost_block = sym.block;
1051 }
1052
1053 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1054 write_exp_elt_block (pstate, sym.block);
1055 write_exp_elt_sym (pstate, sym.symbol);
1056 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1057 }
1058 else if ($1.is_a_field_of_this)
1059 {
1060 /* C++: it hangs off of `this'. Must
1061 not inadvertently convert from a method call
1062 to data ref. */
1063 if (innermost_block == 0
1064 || contained_in (sym.block,
1065 innermost_block))
1066 innermost_block = sym.block;
1067 write_exp_elt_opcode (pstate, OP_THIS);
1068 write_exp_elt_opcode (pstate, OP_THIS);
1069 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
1070 write_exp_string (pstate, $1.stoken);
1071 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
1072 }
1073 else
1074 {
1075 char *arg = copy_name ($1.stoken);
1076
1077 bound_minimal_symbol msymbol
1078 = lookup_bound_minimal_symbol (arg);
1079 if (msymbol.minsym == NULL)
1080 {
1081 if (!have_full_symbols () && !have_partial_symbols ())
1082 error (_("No symbol table is loaded. Use the \"file\" command."));
1083 else
1084 error (_("No symbol \"%s\" in current context."),
1085 copy_name ($1.stoken));
1086 }
1087
1088 /* This minsym might be an alias for
1089 another function. See if we can find
1090 the debug symbol for the target, and
1091 if so, use it instead, since it has
1092 return type / prototype info. This
1093 is important for example for "p
1094 *__errno_location()". */
1095 symbol *alias_target
1096 = find_function_alias_target (msymbol);
1097 if (alias_target != NULL)
1098 {
1099 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1100 write_exp_elt_block
1101 (pstate, SYMBOL_BLOCK_VALUE (alias_target));
1102 write_exp_elt_sym (pstate, alias_target);
1103 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1104 }
1105 else
1106 write_exp_msymbol (pstate, msymbol);
1107 }
1108 }
1109 ;
1110
1111 space_identifier : '@' NAME
1112 { insert_type_address_space (pstate, copy_name ($2.stoken)); }
1113 ;
1114
1115 const_or_volatile: const_or_volatile_noopt
1116 |
1117 ;
1118
1119 cv_with_space_id : const_or_volatile space_identifier const_or_volatile
1120 ;
1121
1122 const_or_volatile_or_space_identifier_noopt: cv_with_space_id
1123 | const_or_volatile_noopt
1124 ;
1125
1126 const_or_volatile_or_space_identifier:
1127 const_or_volatile_or_space_identifier_noopt
1128 |
1129 ;
1130
1131 ptr_operator:
1132 ptr_operator '*'
1133 { insert_type (tp_pointer); }
1134 const_or_volatile_or_space_identifier
1135 | '*'
1136 { insert_type (tp_pointer); }
1137 const_or_volatile_or_space_identifier
1138 | '&'
1139 { insert_type (tp_reference); }
1140 | '&' ptr_operator
1141 { insert_type (tp_reference); }
1142 | ANDAND
1143 { insert_type (tp_rvalue_reference); }
1144 | ANDAND ptr_operator
1145 { insert_type (tp_rvalue_reference); }
1146 ;
1147
1148 ptr_operator_ts: ptr_operator
1149 {
1150 $$ = get_type_stack ();
1151 /* This cleanup is eventually run by
1152 c_parse. */
1153 make_cleanup (type_stack_cleanup, $$);
1154 }
1155 ;
1156
1157 abs_decl: ptr_operator_ts direct_abs_decl
1158 { $$ = append_type_stack ($2, $1); }
1159 | ptr_operator_ts
1160 | direct_abs_decl
1161 ;
1162
1163 direct_abs_decl: '(' abs_decl ')'
1164 { $$ = $2; }
1165 | direct_abs_decl array_mod
1166 {
1167 push_type_stack ($1);
1168 push_type_int ($2);
1169 push_type (tp_array);
1170 $$ = get_type_stack ();
1171 }
1172 | array_mod
1173 {
1174 push_type_int ($1);
1175 push_type (tp_array);
1176 $$ = get_type_stack ();
1177 }
1178
1179 | direct_abs_decl func_mod
1180 {
1181 push_type_stack ($1);
1182 push_typelist ($2);
1183 $$ = get_type_stack ();
1184 }
1185 | func_mod
1186 {
1187 push_typelist ($1);
1188 $$ = get_type_stack ();
1189 }
1190 ;
1191
1192 array_mod: '[' ']'
1193 { $$ = -1; }
1194 | OBJC_LBRAC ']'
1195 { $$ = -1; }
1196 | '[' INT ']'
1197 { $$ = $2.val; }
1198 | OBJC_LBRAC INT ']'
1199 { $$ = $2.val; }
1200 ;
1201
1202 func_mod: '(' ')'
1203 { $$ = NULL; }
1204 | '(' parameter_typelist ')'
1205 { $$ = $2; }
1206 ;
1207
1208 /* We used to try to recognize pointer to member types here, but
1209 that didn't work (shift/reduce conflicts meant that these rules never
1210 got executed). The problem is that
1211 int (foo::bar::baz::bizzle)
1212 is a function type but
1213 int (foo::bar::baz::bizzle::*)
1214 is a pointer to member type. Stroustrup loses again! */
1215
1216 type : ptype
1217 ;
1218
1219 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
1220 : TYPENAME
1221 { $$ = $1.type; }
1222 | INT_KEYWORD
1223 { $$ = lookup_signed_typename (parse_language (pstate),
1224 parse_gdbarch (pstate),
1225 "int"); }
1226 | LONG
1227 { $$ = lookup_signed_typename (parse_language (pstate),
1228 parse_gdbarch (pstate),
1229 "long"); }
1230 | SHORT
1231 { $$ = lookup_signed_typename (parse_language (pstate),
1232 parse_gdbarch (pstate),
1233 "short"); }
1234 | LONG INT_KEYWORD
1235 { $$ = lookup_signed_typename (parse_language (pstate),
1236 parse_gdbarch (pstate),
1237 "long"); }
1238 | LONG SIGNED_KEYWORD INT_KEYWORD
1239 { $$ = lookup_signed_typename (parse_language (pstate),
1240 parse_gdbarch (pstate),
1241 "long"); }
1242 | LONG SIGNED_KEYWORD
1243 { $$ = lookup_signed_typename (parse_language (pstate),
1244 parse_gdbarch (pstate),
1245 "long"); }
1246 | SIGNED_KEYWORD LONG INT_KEYWORD
1247 { $$ = lookup_signed_typename (parse_language (pstate),
1248 parse_gdbarch (pstate),
1249 "long"); }
1250 | UNSIGNED LONG INT_KEYWORD
1251 { $$ = lookup_unsigned_typename (parse_language (pstate),
1252 parse_gdbarch (pstate),
1253 "long"); }
1254 | LONG UNSIGNED INT_KEYWORD
1255 { $$ = lookup_unsigned_typename (parse_language (pstate),
1256 parse_gdbarch (pstate),
1257 "long"); }
1258 | LONG UNSIGNED
1259 { $$ = lookup_unsigned_typename (parse_language (pstate),
1260 parse_gdbarch (pstate),
1261 "long"); }
1262 | LONG LONG
1263 { $$ = lookup_signed_typename (parse_language (pstate),
1264 parse_gdbarch (pstate),
1265 "long long"); }
1266 | LONG LONG INT_KEYWORD
1267 { $$ = lookup_signed_typename (parse_language (pstate),
1268 parse_gdbarch (pstate),
1269 "long long"); }
1270 | LONG LONG SIGNED_KEYWORD INT_KEYWORD
1271 { $$ = lookup_signed_typename (parse_language (pstate),
1272 parse_gdbarch (pstate),
1273 "long long"); }
1274 | LONG LONG SIGNED_KEYWORD
1275 { $$ = lookup_signed_typename (parse_language (pstate),
1276 parse_gdbarch (pstate),
1277 "long long"); }
1278 | SIGNED_KEYWORD LONG LONG
1279 { $$ = lookup_signed_typename (parse_language (pstate),
1280 parse_gdbarch (pstate),
1281 "long long"); }
1282 | SIGNED_KEYWORD LONG LONG INT_KEYWORD
1283 { $$ = lookup_signed_typename (parse_language (pstate),
1284 parse_gdbarch (pstate),
1285 "long long"); }
1286 | UNSIGNED LONG LONG
1287 { $$ = lookup_unsigned_typename (parse_language (pstate),
1288 parse_gdbarch (pstate),
1289 "long long"); }
1290 | UNSIGNED LONG LONG INT_KEYWORD
1291 { $$ = lookup_unsigned_typename (parse_language (pstate),
1292 parse_gdbarch (pstate),
1293 "long long"); }
1294 | LONG LONG UNSIGNED
1295 { $$ = lookup_unsigned_typename (parse_language (pstate),
1296 parse_gdbarch (pstate),
1297 "long long"); }
1298 | LONG LONG UNSIGNED INT_KEYWORD
1299 { $$ = lookup_unsigned_typename (parse_language (pstate),
1300 parse_gdbarch (pstate),
1301 "long long"); }
1302 | SHORT INT_KEYWORD
1303 { $$ = lookup_signed_typename (parse_language (pstate),
1304 parse_gdbarch (pstate),
1305 "short"); }
1306 | SHORT SIGNED_KEYWORD INT_KEYWORD
1307 { $$ = lookup_signed_typename (parse_language (pstate),
1308 parse_gdbarch (pstate),
1309 "short"); }
1310 | SHORT SIGNED_KEYWORD
1311 { $$ = lookup_signed_typename (parse_language (pstate),
1312 parse_gdbarch (pstate),
1313 "short"); }
1314 | UNSIGNED SHORT INT_KEYWORD
1315 { $$ = lookup_unsigned_typename (parse_language (pstate),
1316 parse_gdbarch (pstate),
1317 "short"); }
1318 | SHORT UNSIGNED
1319 { $$ = lookup_unsigned_typename (parse_language (pstate),
1320 parse_gdbarch (pstate),
1321 "short"); }
1322 | SHORT UNSIGNED INT_KEYWORD
1323 { $$ = lookup_unsigned_typename (parse_language (pstate),
1324 parse_gdbarch (pstate),
1325 "short"); }
1326 | DOUBLE_KEYWORD
1327 { $$ = lookup_typename (parse_language (pstate),
1328 parse_gdbarch (pstate),
1329 "double",
1330 (struct block *) NULL,
1331 0); }
1332 | LONG DOUBLE_KEYWORD
1333 { $$ = lookup_typename (parse_language (pstate),
1334 parse_gdbarch (pstate),
1335 "long double",
1336 (struct block *) NULL,
1337 0); }
1338 | STRUCT name
1339 { $$ = lookup_struct (copy_name ($2),
1340 expression_context_block); }
1341 | STRUCT COMPLETE
1342 {
1343 mark_completion_tag (TYPE_CODE_STRUCT, "", 0);
1344 $$ = NULL;
1345 }
1346 | STRUCT name COMPLETE
1347 {
1348 mark_completion_tag (TYPE_CODE_STRUCT, $2.ptr,
1349 $2.length);
1350 $$ = NULL;
1351 }
1352 | CLASS name
1353 { $$ = lookup_struct (copy_name ($2),
1354 expression_context_block); }
1355 | CLASS COMPLETE
1356 {
1357 mark_completion_tag (TYPE_CODE_STRUCT, "", 0);
1358 $$ = NULL;
1359 }
1360 | CLASS name COMPLETE
1361 {
1362 mark_completion_tag (TYPE_CODE_STRUCT, $2.ptr,
1363 $2.length);
1364 $$ = NULL;
1365 }
1366 | UNION name
1367 { $$ = lookup_union (copy_name ($2),
1368 expression_context_block); }
1369 | UNION COMPLETE
1370 {
1371 mark_completion_tag (TYPE_CODE_UNION, "", 0);
1372 $$ = NULL;
1373 }
1374 | UNION name COMPLETE
1375 {
1376 mark_completion_tag (TYPE_CODE_UNION, $2.ptr,
1377 $2.length);
1378 $$ = NULL;
1379 }
1380 | ENUM name
1381 { $$ = lookup_enum (copy_name ($2),
1382 expression_context_block); }
1383 | ENUM COMPLETE
1384 {
1385 mark_completion_tag (TYPE_CODE_ENUM, "", 0);
1386 $$ = NULL;
1387 }
1388 | ENUM name COMPLETE
1389 {
1390 mark_completion_tag (TYPE_CODE_ENUM, $2.ptr,
1391 $2.length);
1392 $$ = NULL;
1393 }
1394 | UNSIGNED type_name
1395 { $$ = lookup_unsigned_typename (parse_language (pstate),
1396 parse_gdbarch (pstate),
1397 TYPE_NAME($2.type)); }
1398 | UNSIGNED
1399 { $$ = lookup_unsigned_typename (parse_language (pstate),
1400 parse_gdbarch (pstate),
1401 "int"); }
1402 | SIGNED_KEYWORD type_name
1403 { $$ = lookup_signed_typename (parse_language (pstate),
1404 parse_gdbarch (pstate),
1405 TYPE_NAME($2.type)); }
1406 | SIGNED_KEYWORD
1407 { $$ = lookup_signed_typename (parse_language (pstate),
1408 parse_gdbarch (pstate),
1409 "int"); }
1410 /* It appears that this rule for templates is never
1411 reduced; template recognition happens by lookahead
1412 in the token processing code in yylex. */
1413 | TEMPLATE name '<' type '>'
1414 { $$ = lookup_template_type(copy_name($2), $4,
1415 expression_context_block);
1416 }
1417 | const_or_volatile_or_space_identifier_noopt typebase
1418 { $$ = follow_types ($2); }
1419 | typebase const_or_volatile_or_space_identifier_noopt
1420 { $$ = follow_types ($1); }
1421 ;
1422
1423 type_name: TYPENAME
1424 | INT_KEYWORD
1425 {
1426 $$.stoken.ptr = "int";
1427 $$.stoken.length = 3;
1428 $$.type = lookup_signed_typename (parse_language (pstate),
1429 parse_gdbarch (pstate),
1430 "int");
1431 }
1432 | LONG
1433 {
1434 $$.stoken.ptr = "long";
1435 $$.stoken.length = 4;
1436 $$.type = lookup_signed_typename (parse_language (pstate),
1437 parse_gdbarch (pstate),
1438 "long");
1439 }
1440 | SHORT
1441 {
1442 $$.stoken.ptr = "short";
1443 $$.stoken.length = 5;
1444 $$.type = lookup_signed_typename (parse_language (pstate),
1445 parse_gdbarch (pstate),
1446 "short");
1447 }
1448 ;
1449
1450 parameter_typelist:
1451 nonempty_typelist
1452 { check_parameter_typelist ($1); }
1453 | nonempty_typelist ',' DOTDOTDOT
1454 {
1455 VEC_safe_push (type_ptr, $1, NULL);
1456 check_parameter_typelist ($1);
1457 $$ = $1;
1458 }
1459 ;
1460
1461 nonempty_typelist
1462 : type
1463 {
1464 VEC (type_ptr) *typelist = NULL;
1465 VEC_safe_push (type_ptr, typelist, $1);
1466 $$ = typelist;
1467 }
1468 | nonempty_typelist ',' type
1469 {
1470 VEC_safe_push (type_ptr, $1, $3);
1471 $$ = $1;
1472 }
1473 ;
1474
1475 ptype : typebase
1476 | ptype abs_decl
1477 {
1478 push_type_stack ($2);
1479 $$ = follow_types ($1);
1480 }
1481 ;
1482
1483 conversion_type_id: typebase conversion_declarator
1484 { $$ = follow_types ($1); }
1485 ;
1486
1487 conversion_declarator: /* Nothing. */
1488 | ptr_operator conversion_declarator
1489 ;
1490
1491 const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
1492 | VOLATILE_KEYWORD CONST_KEYWORD
1493 ;
1494
1495 const_or_volatile_noopt: const_and_volatile
1496 { insert_type (tp_const);
1497 insert_type (tp_volatile);
1498 }
1499 | CONST_KEYWORD
1500 { insert_type (tp_const); }
1501 | VOLATILE_KEYWORD
1502 { insert_type (tp_volatile); }
1503 ;
1504
1505 oper: OPERATOR NEW
1506 { $$ = operator_stoken (" new"); }
1507 | OPERATOR DELETE
1508 { $$ = operator_stoken (" delete"); }
1509 | OPERATOR NEW '[' ']'
1510 { $$ = operator_stoken (" new[]"); }
1511 | OPERATOR DELETE '[' ']'
1512 { $$ = operator_stoken (" delete[]"); }
1513 | OPERATOR NEW OBJC_LBRAC ']'
1514 { $$ = operator_stoken (" new[]"); }
1515 | OPERATOR DELETE OBJC_LBRAC ']'
1516 { $$ = operator_stoken (" delete[]"); }
1517 | OPERATOR '+'
1518 { $$ = operator_stoken ("+"); }
1519 | OPERATOR '-'
1520 { $$ = operator_stoken ("-"); }
1521 | OPERATOR '*'
1522 { $$ = operator_stoken ("*"); }
1523 | OPERATOR '/'
1524 { $$ = operator_stoken ("/"); }
1525 | OPERATOR '%'
1526 { $$ = operator_stoken ("%"); }
1527 | OPERATOR '^'
1528 { $$ = operator_stoken ("^"); }
1529 | OPERATOR '&'
1530 { $$ = operator_stoken ("&"); }
1531 | OPERATOR '|'
1532 { $$ = operator_stoken ("|"); }
1533 | OPERATOR '~'
1534 { $$ = operator_stoken ("~"); }
1535 | OPERATOR '!'
1536 { $$ = operator_stoken ("!"); }
1537 | OPERATOR '='
1538 { $$ = operator_stoken ("="); }
1539 | OPERATOR '<'
1540 { $$ = operator_stoken ("<"); }
1541 | OPERATOR '>'
1542 { $$ = operator_stoken (">"); }
1543 | OPERATOR ASSIGN_MODIFY
1544 { const char *op = " unknown";
1545 switch ($2)
1546 {
1547 case BINOP_RSH:
1548 op = ">>=";
1549 break;
1550 case BINOP_LSH:
1551 op = "<<=";
1552 break;
1553 case BINOP_ADD:
1554 op = "+=";
1555 break;
1556 case BINOP_SUB:
1557 op = "-=";
1558 break;
1559 case BINOP_MUL:
1560 op = "*=";
1561 break;
1562 case BINOP_DIV:
1563 op = "/=";
1564 break;
1565 case BINOP_REM:
1566 op = "%=";
1567 break;
1568 case BINOP_BITWISE_IOR:
1569 op = "|=";
1570 break;
1571 case BINOP_BITWISE_AND:
1572 op = "&=";
1573 break;
1574 case BINOP_BITWISE_XOR:
1575 op = "^=";
1576 break;
1577 default:
1578 break;
1579 }
1580
1581 $$ = operator_stoken (op);
1582 }
1583 | OPERATOR LSH
1584 { $$ = operator_stoken ("<<"); }
1585 | OPERATOR RSH
1586 { $$ = operator_stoken (">>"); }
1587 | OPERATOR EQUAL
1588 { $$ = operator_stoken ("=="); }
1589 | OPERATOR NOTEQUAL
1590 { $$ = operator_stoken ("!="); }
1591 | OPERATOR LEQ
1592 { $$ = operator_stoken ("<="); }
1593 | OPERATOR GEQ
1594 { $$ = operator_stoken (">="); }
1595 | OPERATOR ANDAND
1596 { $$ = operator_stoken ("&&"); }
1597 | OPERATOR OROR
1598 { $$ = operator_stoken ("||"); }
1599 | OPERATOR INCREMENT
1600 { $$ = operator_stoken ("++"); }
1601 | OPERATOR DECREMENT
1602 { $$ = operator_stoken ("--"); }
1603 | OPERATOR ','
1604 { $$ = operator_stoken (","); }
1605 | OPERATOR ARROW_STAR
1606 { $$ = operator_stoken ("->*"); }
1607 | OPERATOR ARROW
1608 { $$ = operator_stoken ("->"); }
1609 | OPERATOR '(' ')'
1610 { $$ = operator_stoken ("()"); }
1611 | OPERATOR '[' ']'
1612 { $$ = operator_stoken ("[]"); }
1613 | OPERATOR OBJC_LBRAC ']'
1614 { $$ = operator_stoken ("[]"); }
1615 | OPERATOR conversion_type_id
1616 { string_file buf;
1617
1618 c_print_type ($2, NULL, &buf, -1, 0,
1619 &type_print_raw_options);
1620
1621 /* This also needs canonicalization. */
1622 std::string canon
1623 = cp_canonicalize_string (buf.c_str ());
1624 if (canon.empty ())
1625 canon = std::move (buf.string ());
1626 $$ = operator_stoken ((" " + canon).c_str ());
1627 }
1628 ;
1629
1630
1631
1632 name : NAME { $$ = $1.stoken; }
1633 | BLOCKNAME { $$ = $1.stoken; }
1634 | TYPENAME { $$ = $1.stoken; }
1635 | NAME_OR_INT { $$ = $1.stoken; }
1636 | UNKNOWN_CPP_NAME { $$ = $1.stoken; }
1637 | oper { $$ = $1; }
1638 ;
1639
1640 name_not_typename : NAME
1641 | BLOCKNAME
1642 /* These would be useful if name_not_typename was useful, but it is just
1643 a fake for "variable", so these cause reduce/reduce conflicts because
1644 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
1645 =exp) or just an exp. If name_not_typename was ever used in an lvalue
1646 context where only a name could occur, this might be useful.
1647 | NAME_OR_INT
1648 */
1649 | oper
1650 {
1651 struct field_of_this_result is_a_field_of_this;
1652
1653 $$.stoken = $1;
1654 $$.sym = lookup_symbol ($1.ptr,
1655 expression_context_block,
1656 VAR_DOMAIN,
1657 &is_a_field_of_this);
1658 $$.is_a_field_of_this
1659 = is_a_field_of_this.type != NULL;
1660 }
1661 | UNKNOWN_CPP_NAME
1662 ;
1663
1664 %%
1665
1666 /* Like write_exp_string, but prepends a '~'. */
1667
1668 static void
1669 write_destructor_name (struct parser_state *par_state, struct stoken token)
1670 {
1671 char *copy = (char *) alloca (token.length + 1);
1672
1673 copy[0] = '~';
1674 memcpy (&copy[1], token.ptr, token.length);
1675
1676 token.ptr = copy;
1677 ++token.length;
1678
1679 write_exp_string (par_state, token);
1680 }
1681
1682 /* Returns a stoken of the operator name given by OP (which does not
1683 include the string "operator"). */
1684
1685 static struct stoken
1686 operator_stoken (const char *op)
1687 {
1688 struct stoken st = { NULL, 0 };
1689 char *buf;
1690
1691 st.length = CP_OPERATOR_LEN + strlen (op);
1692 buf = (char *) malloc (st.length + 1);
1693 strcpy (buf, CP_OPERATOR_STR);
1694 strcat (buf, op);
1695 st.ptr = buf;
1696
1697 /* The toplevel (c_parse) will free the memory allocated here. */
1698 make_cleanup (free, buf);
1699 return st;
1700 };
1701
1702 /* Return true if the type is aggregate-like. */
1703
1704 static int
1705 type_aggregate_p (struct type *type)
1706 {
1707 return (TYPE_CODE (type) == TYPE_CODE_STRUCT
1708 || TYPE_CODE (type) == TYPE_CODE_UNION
1709 || TYPE_CODE (type) == TYPE_CODE_NAMESPACE
1710 || (TYPE_CODE (type) == TYPE_CODE_ENUM
1711 && TYPE_DECLARED_CLASS (type)));
1712 }
1713
1714 /* Validate a parameter typelist. */
1715
1716 static void
1717 check_parameter_typelist (VEC (type_ptr) *params)
1718 {
1719 struct type *type;
1720 int ix;
1721
1722 for (ix = 0; VEC_iterate (type_ptr, params, ix, type); ++ix)
1723 {
1724 if (type != NULL && TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID)
1725 {
1726 if (ix == 0)
1727 {
1728 if (VEC_length (type_ptr, params) == 1)
1729 {
1730 /* Ok. */
1731 break;
1732 }
1733 VEC_free (type_ptr, params);
1734 error (_("parameter types following 'void'"));
1735 }
1736 else
1737 {
1738 VEC_free (type_ptr, params);
1739 error (_("'void' invalid as parameter type"));
1740 }
1741 }
1742 }
1743 }
1744
1745 /* Take care of parsing a number (anything that starts with a digit).
1746 Set yylval and return the token type; update lexptr.
1747 LEN is the number of characters in it. */
1748
1749 /*** Needs some error checking for the float case ***/
1750
1751 static int
1752 parse_number (struct parser_state *par_state,
1753 const char *buf, int len, int parsed_float, YYSTYPE *putithere)
1754 {
1755 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
1756 here, and we do kind of silly things like cast to unsigned. */
1757 LONGEST n = 0;
1758 LONGEST prevn = 0;
1759 ULONGEST un;
1760
1761 int i = 0;
1762 int c;
1763 int base = input_radix;
1764 int unsigned_p = 0;
1765
1766 /* Number of "L" suffixes encountered. */
1767 int long_p = 0;
1768
1769 /* We have found a "L" or "U" suffix. */
1770 int found_suffix = 0;
1771
1772 ULONGEST high_bit;
1773 struct type *signed_type;
1774 struct type *unsigned_type;
1775 char *p;
1776
1777 p = (char *) alloca (len);
1778 memcpy (p, buf, len);
1779
1780 if (parsed_float)
1781 {
1782 /* Handle suffixes for decimal floating-point: "df", "dd" or "dl". */
1783 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
1784 {
1785 putithere->typed_val_float.type
1786 = parse_type (par_state)->builtin_decfloat;
1787 len -= 2;
1788 }
1789 else if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
1790 {
1791 putithere->typed_val_float.type
1792 = parse_type (par_state)->builtin_decdouble;
1793 len -= 2;
1794 }
1795 else if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
1796 {
1797 putithere->typed_val_float.type
1798 = parse_type (par_state)->builtin_declong;
1799 len -= 2;
1800 }
1801 /* Handle suffixes: 'f' for float, 'l' for long double. */
1802 else if (len >= 1 && tolower (p[len - 1]) == 'f')
1803 {
1804 putithere->typed_val_float.type
1805 = parse_type (par_state)->builtin_float;
1806 len -= 1;
1807 }
1808 else if (len >= 1 && tolower (p[len - 1]) == 'l')
1809 {
1810 putithere->typed_val_float.type
1811 = parse_type (par_state)->builtin_long_double;
1812 len -= 1;
1813 }
1814 /* Default type for floating-point literals is double. */
1815 else
1816 {
1817 putithere->typed_val_float.type
1818 = parse_type (par_state)->builtin_double;
1819 }
1820
1821 if (!parse_float (p, len,
1822 putithere->typed_val_float.type,
1823 putithere->typed_val_float.val))
1824 return ERROR;
1825 return FLOAT;
1826 }
1827
1828 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1829 if (p[0] == '0' && len > 1)
1830 switch (p[1])
1831 {
1832 case 'x':
1833 case 'X':
1834 if (len >= 3)
1835 {
1836 p += 2;
1837 base = 16;
1838 len -= 2;
1839 }
1840 break;
1841
1842 case 'b':
1843 case 'B':
1844 if (len >= 3)
1845 {
1846 p += 2;
1847 base = 2;
1848 len -= 2;
1849 }
1850 break;
1851
1852 case 't':
1853 case 'T':
1854 case 'd':
1855 case 'D':
1856 if (len >= 3)
1857 {
1858 p += 2;
1859 base = 10;
1860 len -= 2;
1861 }
1862 break;
1863
1864 default:
1865 base = 8;
1866 break;
1867 }
1868
1869 while (len-- > 0)
1870 {
1871 c = *p++;
1872 if (c >= 'A' && c <= 'Z')
1873 c += 'a' - 'A';
1874 if (c != 'l' && c != 'u')
1875 n *= base;
1876 if (c >= '0' && c <= '9')
1877 {
1878 if (found_suffix)
1879 return ERROR;
1880 n += i = c - '0';
1881 }
1882 else
1883 {
1884 if (base > 10 && c >= 'a' && c <= 'f')
1885 {
1886 if (found_suffix)
1887 return ERROR;
1888 n += i = c - 'a' + 10;
1889 }
1890 else if (c == 'l')
1891 {
1892 ++long_p;
1893 found_suffix = 1;
1894 }
1895 else if (c == 'u')
1896 {
1897 unsigned_p = 1;
1898 found_suffix = 1;
1899 }
1900 else
1901 return ERROR; /* Char not a digit */
1902 }
1903 if (i >= base)
1904 return ERROR; /* Invalid digit in this base */
1905
1906 /* Portably test for overflow (only works for nonzero values, so make
1907 a second check for zero). FIXME: Can't we just make n and prevn
1908 unsigned and avoid this? */
1909 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1910 unsigned_p = 1; /* Try something unsigned */
1911
1912 /* Portably test for unsigned overflow.
1913 FIXME: This check is wrong; for example it doesn't find overflow
1914 on 0x123456789 when LONGEST is 32 bits. */
1915 if (c != 'l' && c != 'u' && n != 0)
1916 {
1917 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
1918 error (_("Numeric constant too large."));
1919 }
1920 prevn = n;
1921 }
1922
1923 /* An integer constant is an int, a long, or a long long. An L
1924 suffix forces it to be long; an LL suffix forces it to be long
1925 long. If not forced to a larger size, it gets the first type of
1926 the above that it fits in. To figure out whether it fits, we
1927 shift it right and see whether anything remains. Note that we
1928 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1929 operation, because many compilers will warn about such a shift
1930 (which always produces a zero result). Sometimes gdbarch_int_bit
1931 or gdbarch_long_bit will be that big, sometimes not. To deal with
1932 the case where it is we just always shift the value more than
1933 once, with fewer bits each time. */
1934
1935 un = (ULONGEST)n >> 2;
1936 if (long_p == 0
1937 && (un >> (gdbarch_int_bit (parse_gdbarch (par_state)) - 2)) == 0)
1938 {
1939 high_bit
1940 = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch (par_state)) - 1);
1941
1942 /* A large decimal (not hex or octal) constant (between INT_MAX
1943 and UINT_MAX) is a long or unsigned long, according to ANSI,
1944 never an unsigned int, but this code treats it as unsigned
1945 int. This probably should be fixed. GCC gives a warning on
1946 such constants. */
1947
1948 unsigned_type = parse_type (par_state)->builtin_unsigned_int;
1949 signed_type = parse_type (par_state)->builtin_int;
1950 }
1951 else if (long_p <= 1
1952 && (un >> (gdbarch_long_bit (parse_gdbarch (par_state)) - 2)) == 0)
1953 {
1954 high_bit
1955 = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch (par_state)) - 1);
1956 unsigned_type = parse_type (par_state)->builtin_unsigned_long;
1957 signed_type = parse_type (par_state)->builtin_long;
1958 }
1959 else
1960 {
1961 int shift;
1962 if (sizeof (ULONGEST) * HOST_CHAR_BIT
1963 < gdbarch_long_long_bit (parse_gdbarch (par_state)))
1964 /* A long long does not fit in a LONGEST. */
1965 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1966 else
1967 shift = (gdbarch_long_long_bit (parse_gdbarch (par_state)) - 1);
1968 high_bit = (ULONGEST) 1 << shift;
1969 unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
1970 signed_type = parse_type (par_state)->builtin_long_long;
1971 }
1972
1973 putithere->typed_val_int.val = n;
1974
1975 /* If the high bit of the worked out type is set then this number
1976 has to be unsigned. */
1977
1978 if (unsigned_p || (n & high_bit))
1979 {
1980 putithere->typed_val_int.type = unsigned_type;
1981 }
1982 else
1983 {
1984 putithere->typed_val_int.type = signed_type;
1985 }
1986
1987 return INT;
1988 }
1989
1990 /* Temporary obstack used for holding strings. */
1991 static struct obstack tempbuf;
1992 static int tempbuf_init;
1993
1994 /* Parse a C escape sequence. The initial backslash of the sequence
1995 is at (*PTR)[-1]. *PTR will be updated to point to just after the
1996 last character of the sequence. If OUTPUT is not NULL, the
1997 translated form of the escape sequence will be written there. If
1998 OUTPUT is NULL, no output is written and the call will only affect
1999 *PTR. If an escape sequence is expressed in target bytes, then the
2000 entire sequence will simply be copied to OUTPUT. Return 1 if any
2001 character was emitted, 0 otherwise. */
2002
2003 int
2004 c_parse_escape (const char **ptr, struct obstack *output)
2005 {
2006 const char *tokptr = *ptr;
2007 int result = 1;
2008
2009 /* Some escape sequences undergo character set conversion. Those we
2010 translate here. */
2011 switch (*tokptr)
2012 {
2013 /* Hex escapes do not undergo character set conversion, so keep
2014 the escape sequence for later. */
2015 case 'x':
2016 if (output)
2017 obstack_grow_str (output, "\\x");
2018 ++tokptr;
2019 if (!isxdigit (*tokptr))
2020 error (_("\\x escape without a following hex digit"));
2021 while (isxdigit (*tokptr))
2022 {
2023 if (output)
2024 obstack_1grow (output, *tokptr);
2025 ++tokptr;
2026 }
2027 break;
2028
2029 /* Octal escapes do not undergo character set conversion, so
2030 keep the escape sequence for later. */
2031 case '0':
2032 case '1':
2033 case '2':
2034 case '3':
2035 case '4':
2036 case '5':
2037 case '6':
2038 case '7':
2039 {
2040 int i;
2041 if (output)
2042 obstack_grow_str (output, "\\");
2043 for (i = 0;
2044 i < 3 && isdigit (*tokptr) && *tokptr != '8' && *tokptr != '9';
2045 ++i)
2046 {
2047 if (output)
2048 obstack_1grow (output, *tokptr);
2049 ++tokptr;
2050 }
2051 }
2052 break;
2053
2054 /* We handle UCNs later. We could handle them here, but that
2055 would mean a spurious error in the case where the UCN could
2056 be converted to the target charset but not the host
2057 charset. */
2058 case 'u':
2059 case 'U':
2060 {
2061 char c = *tokptr;
2062 int i, len = c == 'U' ? 8 : 4;
2063 if (output)
2064 {
2065 obstack_1grow (output, '\\');
2066 obstack_1grow (output, *tokptr);
2067 }
2068 ++tokptr;
2069 if (!isxdigit (*tokptr))
2070 error (_("\\%c escape without a following hex digit"), c);
2071 for (i = 0; i < len && isxdigit (*tokptr); ++i)
2072 {
2073 if (output)
2074 obstack_1grow (output, *tokptr);
2075 ++tokptr;
2076 }
2077 }
2078 break;
2079
2080 /* We must pass backslash through so that it does not
2081 cause quoting during the second expansion. */
2082 case '\\':
2083 if (output)
2084 obstack_grow_str (output, "\\\\");
2085 ++tokptr;
2086 break;
2087
2088 /* Escapes which undergo conversion. */
2089 case 'a':
2090 if (output)
2091 obstack_1grow (output, '\a');
2092 ++tokptr;
2093 break;
2094 case 'b':
2095 if (output)
2096 obstack_1grow (output, '\b');
2097 ++tokptr;
2098 break;
2099 case 'f':
2100 if (output)
2101 obstack_1grow (output, '\f');
2102 ++tokptr;
2103 break;
2104 case 'n':
2105 if (output)
2106 obstack_1grow (output, '\n');
2107 ++tokptr;
2108 break;
2109 case 'r':
2110 if (output)
2111 obstack_1grow (output, '\r');
2112 ++tokptr;
2113 break;
2114 case 't':
2115 if (output)
2116 obstack_1grow (output, '\t');
2117 ++tokptr;
2118 break;
2119 case 'v':
2120 if (output)
2121 obstack_1grow (output, '\v');
2122 ++tokptr;
2123 break;
2124
2125 /* GCC extension. */
2126 case 'e':
2127 if (output)
2128 obstack_1grow (output, HOST_ESCAPE_CHAR);
2129 ++tokptr;
2130 break;
2131
2132 /* Backslash-newline expands to nothing at all. */
2133 case '\n':
2134 ++tokptr;
2135 result = 0;
2136 break;
2137
2138 /* A few escapes just expand to the character itself. */
2139 case '\'':
2140 case '\"':
2141 case '?':
2142 /* GCC extensions. */
2143 case '(':
2144 case '{':
2145 case '[':
2146 case '%':
2147 /* Unrecognized escapes turn into the character itself. */
2148 default:
2149 if (output)
2150 obstack_1grow (output, *tokptr);
2151 ++tokptr;
2152 break;
2153 }
2154 *ptr = tokptr;
2155 return result;
2156 }
2157
2158 /* Parse a string or character literal from TOKPTR. The string or
2159 character may be wide or unicode. *OUTPTR is set to just after the
2160 end of the literal in the input string. The resulting token is
2161 stored in VALUE. This returns a token value, either STRING or
2162 CHAR, depending on what was parsed. *HOST_CHARS is set to the
2163 number of host characters in the literal. */
2164
2165 static int
2166 parse_string_or_char (const char *tokptr, const char **outptr,
2167 struct typed_stoken *value, int *host_chars)
2168 {
2169 int quote;
2170 c_string_type type;
2171 int is_objc = 0;
2172
2173 /* Build the gdb internal form of the input string in tempbuf. Note
2174 that the buffer is null byte terminated *only* for the
2175 convenience of debugging gdb itself and printing the buffer
2176 contents when the buffer contains no embedded nulls. Gdb does
2177 not depend upon the buffer being null byte terminated, it uses
2178 the length string instead. This allows gdb to handle C strings
2179 (as well as strings in other languages) with embedded null
2180 bytes */
2181
2182 if (!tempbuf_init)
2183 tempbuf_init = 1;
2184 else
2185 obstack_free (&tempbuf, NULL);
2186 obstack_init (&tempbuf);
2187
2188 /* Record the string type. */
2189 if (*tokptr == 'L')
2190 {
2191 type = C_WIDE_STRING;
2192 ++tokptr;
2193 }
2194 else if (*tokptr == 'u')
2195 {
2196 type = C_STRING_16;
2197 ++tokptr;
2198 }
2199 else if (*tokptr == 'U')
2200 {
2201 type = C_STRING_32;
2202 ++tokptr;
2203 }
2204 else if (*tokptr == '@')
2205 {
2206 /* An Objective C string. */
2207 is_objc = 1;
2208 type = C_STRING;
2209 ++tokptr;
2210 }
2211 else
2212 type = C_STRING;
2213
2214 /* Skip the quote. */
2215 quote = *tokptr;
2216 if (quote == '\'')
2217 type |= C_CHAR;
2218 ++tokptr;
2219
2220 *host_chars = 0;
2221
2222 while (*tokptr)
2223 {
2224 char c = *tokptr;
2225 if (c == '\\')
2226 {
2227 ++tokptr;
2228 *host_chars += c_parse_escape (&tokptr, &tempbuf);
2229 }
2230 else if (c == quote)
2231 break;
2232 else
2233 {
2234 obstack_1grow (&tempbuf, c);
2235 ++tokptr;
2236 /* FIXME: this does the wrong thing with multi-byte host
2237 characters. We could use mbrlen here, but that would
2238 make "set host-charset" a bit less useful. */
2239 ++*host_chars;
2240 }
2241 }
2242
2243 if (*tokptr != quote)
2244 {
2245 if (quote == '"')
2246 error (_("Unterminated string in expression."));
2247 else
2248 error (_("Unmatched single quote."));
2249 }
2250 ++tokptr;
2251
2252 value->type = type;
2253 value->ptr = (char *) obstack_base (&tempbuf);
2254 value->length = obstack_object_size (&tempbuf);
2255
2256 *outptr = tokptr;
2257
2258 return quote == '"' ? (is_objc ? NSSTRING : STRING) : CHAR;
2259 }
2260
2261 /* This is used to associate some attributes with a token. */
2262
2263 enum token_flag
2264 {
2265 /* If this bit is set, the token is C++-only. */
2266
2267 FLAG_CXX = 1,
2268
2269 /* If this bit is set, the token is conditional: if there is a
2270 symbol of the same name, then the token is a symbol; otherwise,
2271 the token is a keyword. */
2272
2273 FLAG_SHADOW = 2
2274 };
2275 DEF_ENUM_FLAGS_TYPE (enum token_flag, token_flags);
2276
2277 struct token
2278 {
2279 const char *oper;
2280 int token;
2281 enum exp_opcode opcode;
2282 token_flags flags;
2283 };
2284
2285 static const struct token tokentab3[] =
2286 {
2287 {">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
2288 {"<<=", ASSIGN_MODIFY, BINOP_LSH, 0},
2289 {"->*", ARROW_STAR, BINOP_END, FLAG_CXX},
2290 {"...", DOTDOTDOT, BINOP_END, 0}
2291 };
2292
2293 static const struct token tokentab2[] =
2294 {
2295 {"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
2296 {"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
2297 {"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
2298 {"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
2299 {"%=", ASSIGN_MODIFY, BINOP_REM, 0},
2300 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
2301 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
2302 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
2303 {"++", INCREMENT, BINOP_END, 0},
2304 {"--", DECREMENT, BINOP_END, 0},
2305 {"->", ARROW, BINOP_END, 0},
2306 {"&&", ANDAND, BINOP_END, 0},
2307 {"||", OROR, BINOP_END, 0},
2308 /* "::" is *not* only C++: gdb overrides its meaning in several
2309 different ways, e.g., 'filename'::func, function::variable. */
2310 {"::", COLONCOLON, BINOP_END, 0},
2311 {"<<", LSH, BINOP_END, 0},
2312 {">>", RSH, BINOP_END, 0},
2313 {"==", EQUAL, BINOP_END, 0},
2314 {"!=", NOTEQUAL, BINOP_END, 0},
2315 {"<=", LEQ, BINOP_END, 0},
2316 {">=", GEQ, BINOP_END, 0},
2317 {".*", DOT_STAR, BINOP_END, FLAG_CXX}
2318 };
2319
2320 /* Identifier-like tokens. */
2321 static const struct token ident_tokens[] =
2322 {
2323 {"unsigned", UNSIGNED, OP_NULL, 0},
2324 {"template", TEMPLATE, OP_NULL, FLAG_CXX},
2325 {"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
2326 {"struct", STRUCT, OP_NULL, 0},
2327 {"signed", SIGNED_KEYWORD, OP_NULL, 0},
2328 {"sizeof", SIZEOF, OP_NULL, 0},
2329 {"double", DOUBLE_KEYWORD, OP_NULL, 0},
2330 {"false", FALSEKEYWORD, OP_NULL, FLAG_CXX},
2331 {"class", CLASS, OP_NULL, FLAG_CXX},
2332 {"union", UNION, OP_NULL, 0},
2333 {"short", SHORT, OP_NULL, 0},
2334 {"const", CONST_KEYWORD, OP_NULL, 0},
2335 {"enum", ENUM, OP_NULL, 0},
2336 {"long", LONG, OP_NULL, 0},
2337 {"true", TRUEKEYWORD, OP_NULL, FLAG_CXX},
2338 {"int", INT_KEYWORD, OP_NULL, 0},
2339 {"new", NEW, OP_NULL, FLAG_CXX},
2340 {"delete", DELETE, OP_NULL, FLAG_CXX},
2341 {"operator", OPERATOR, OP_NULL, FLAG_CXX},
2342
2343 {"and", ANDAND, BINOP_END, FLAG_CXX},
2344 {"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, FLAG_CXX},
2345 {"bitand", '&', OP_NULL, FLAG_CXX},
2346 {"bitor", '|', OP_NULL, FLAG_CXX},
2347 {"compl", '~', OP_NULL, FLAG_CXX},
2348 {"not", '!', OP_NULL, FLAG_CXX},
2349 {"not_eq", NOTEQUAL, BINOP_END, FLAG_CXX},
2350 {"or", OROR, BINOP_END, FLAG_CXX},
2351 {"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, FLAG_CXX},
2352 {"xor", '^', OP_NULL, FLAG_CXX},
2353 {"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, FLAG_CXX},
2354
2355 {"const_cast", CONST_CAST, OP_NULL, FLAG_CXX },
2356 {"dynamic_cast", DYNAMIC_CAST, OP_NULL, FLAG_CXX },
2357 {"static_cast", STATIC_CAST, OP_NULL, FLAG_CXX },
2358 {"reinterpret_cast", REINTERPRET_CAST, OP_NULL, FLAG_CXX },
2359
2360 {"__typeof__", TYPEOF, OP_TYPEOF, 0 },
2361 {"__typeof", TYPEOF, OP_TYPEOF, 0 },
2362 {"typeof", TYPEOF, OP_TYPEOF, FLAG_SHADOW },
2363 {"__decltype", DECLTYPE, OP_DECLTYPE, FLAG_CXX },
2364 {"decltype", DECLTYPE, OP_DECLTYPE, FLAG_CXX | FLAG_SHADOW },
2365
2366 {"typeid", TYPEID, OP_TYPEID, FLAG_CXX}
2367 };
2368
2369 /* When we find that lexptr (the global var defined in parse.c) is
2370 pointing at a macro invocation, we expand the invocation, and call
2371 scan_macro_expansion to save the old lexptr here and point lexptr
2372 into the expanded text. When we reach the end of that, we call
2373 end_macro_expansion to pop back to the value we saved here. The
2374 macro expansion code promises to return only fully-expanded text,
2375 so we don't need to "push" more than one level.
2376
2377 This is disgusting, of course. It would be cleaner to do all macro
2378 expansion beforehand, and then hand that to lexptr. But we don't
2379 really know where the expression ends. Remember, in a command like
2380
2381 (gdb) break *ADDRESS if CONDITION
2382
2383 we evaluate ADDRESS in the scope of the current frame, but we
2384 evaluate CONDITION in the scope of the breakpoint's location. So
2385 it's simply wrong to try to macro-expand the whole thing at once. */
2386 static const char *macro_original_text;
2387
2388 /* We save all intermediate macro expansions on this obstack for the
2389 duration of a single parse. The expansion text may sometimes have
2390 to live past the end of the expansion, due to yacc lookahead.
2391 Rather than try to be clever about saving the data for a single
2392 token, we simply keep it all and delete it after parsing has
2393 completed. */
2394 static struct obstack expansion_obstack;
2395
2396 static void
2397 scan_macro_expansion (char *expansion)
2398 {
2399 char *copy;
2400
2401 /* We'd better not be trying to push the stack twice. */
2402 gdb_assert (! macro_original_text);
2403
2404 /* Copy to the obstack, and then free the intermediate
2405 expansion. */
2406 copy = (char *) obstack_copy0 (&expansion_obstack, expansion,
2407 strlen (expansion));
2408 xfree (expansion);
2409
2410 /* Save the old lexptr value, so we can return to it when we're done
2411 parsing the expanded text. */
2412 macro_original_text = lexptr;
2413 lexptr = copy;
2414 }
2415
2416 static int
2417 scanning_macro_expansion (void)
2418 {
2419 return macro_original_text != 0;
2420 }
2421
2422 static void
2423 finished_macro_expansion (void)
2424 {
2425 /* There'd better be something to pop back to. */
2426 gdb_assert (macro_original_text);
2427
2428 /* Pop back to the original text. */
2429 lexptr = macro_original_text;
2430 macro_original_text = 0;
2431 }
2432
2433 static void
2434 scan_macro_cleanup (void *dummy)
2435 {
2436 if (macro_original_text)
2437 finished_macro_expansion ();
2438
2439 obstack_free (&expansion_obstack, NULL);
2440 }
2441
2442 /* Return true iff the token represents a C++ cast operator. */
2443
2444 static int
2445 is_cast_operator (const char *token, int len)
2446 {
2447 return (! strncmp (token, "dynamic_cast", len)
2448 || ! strncmp (token, "static_cast", len)
2449 || ! strncmp (token, "reinterpret_cast", len)
2450 || ! strncmp (token, "const_cast", len));
2451 }
2452
2453 /* The scope used for macro expansion. */
2454 static struct macro_scope *expression_macro_scope;
2455
2456 /* This is set if a NAME token appeared at the very end of the input
2457 string, with no whitespace separating the name from the EOF. This
2458 is used only when parsing to do field name completion. */
2459 static int saw_name_at_eof;
2460
2461 /* This is set if the previously-returned token was a structure
2462 operator -- either '.' or ARROW. This is used only when parsing to
2463 do field name completion. */
2464 static int last_was_structop;
2465
2466 /* Read one token, getting characters through lexptr. */
2467
2468 static int
2469 lex_one_token (struct parser_state *par_state, int *is_quoted_name)
2470 {
2471 int c;
2472 int namelen;
2473 unsigned int i;
2474 const char *tokstart;
2475 int saw_structop = last_was_structop;
2476 char *copy;
2477
2478 last_was_structop = 0;
2479 *is_quoted_name = 0;
2480
2481 retry:
2482
2483 /* Check if this is a macro invocation that we need to expand. */
2484 if (! scanning_macro_expansion ())
2485 {
2486 char *expanded = macro_expand_next (&lexptr,
2487 standard_macro_lookup,
2488 expression_macro_scope);
2489
2490 if (expanded)
2491 scan_macro_expansion (expanded);
2492 }
2493
2494 prev_lexptr = lexptr;
2495
2496 tokstart = lexptr;
2497 /* See if it is a special token of length 3. */
2498 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
2499 if (strncmp (tokstart, tokentab3[i].oper, 3) == 0)
2500 {
2501 if ((tokentab3[i].flags & FLAG_CXX) != 0
2502 && parse_language (par_state)->la_language != language_cplus)
2503 break;
2504
2505 lexptr += 3;
2506 yylval.opcode = tokentab3[i].opcode;
2507 return tokentab3[i].token;
2508 }
2509
2510 /* See if it is a special token of length 2. */
2511 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
2512 if (strncmp (tokstart, tokentab2[i].oper, 2) == 0)
2513 {
2514 if ((tokentab2[i].flags & FLAG_CXX) != 0
2515 && parse_language (par_state)->la_language != language_cplus)
2516 break;
2517
2518 lexptr += 2;
2519 yylval.opcode = tokentab2[i].opcode;
2520 if (parse_completion && tokentab2[i].token == ARROW)
2521 last_was_structop = 1;
2522 return tokentab2[i].token;
2523 }
2524
2525 switch (c = *tokstart)
2526 {
2527 case 0:
2528 /* If we were just scanning the result of a macro expansion,
2529 then we need to resume scanning the original text.
2530 If we're parsing for field name completion, and the previous
2531 token allows such completion, return a COMPLETE token.
2532 Otherwise, we were already scanning the original text, and
2533 we're really done. */
2534 if (scanning_macro_expansion ())
2535 {
2536 finished_macro_expansion ();
2537 goto retry;
2538 }
2539 else if (saw_name_at_eof)
2540 {
2541 saw_name_at_eof = 0;
2542 return COMPLETE;
2543 }
2544 else if (saw_structop)
2545 return COMPLETE;
2546 else
2547 return 0;
2548
2549 case ' ':
2550 case '\t':
2551 case '\n':
2552 lexptr++;
2553 goto retry;
2554
2555 case '[':
2556 case '(':
2557 paren_depth++;
2558 lexptr++;
2559 if (parse_language (par_state)->la_language == language_objc
2560 && c == '[')
2561 return OBJC_LBRAC;
2562 return c;
2563
2564 case ']':
2565 case ')':
2566 if (paren_depth == 0)
2567 return 0;
2568 paren_depth--;
2569 lexptr++;
2570 return c;
2571
2572 case ',':
2573 if (comma_terminates
2574 && paren_depth == 0
2575 && ! scanning_macro_expansion ())
2576 return 0;
2577 lexptr++;
2578 return c;
2579
2580 case '.':
2581 /* Might be a floating point number. */
2582 if (lexptr[1] < '0' || lexptr[1] > '9')
2583 {
2584 if (parse_completion)
2585 last_was_structop = 1;
2586 goto symbol; /* Nope, must be a symbol. */
2587 }
2588 /* FALL THRU into number case. */
2589
2590 case '0':
2591 case '1':
2592 case '2':
2593 case '3':
2594 case '4':
2595 case '5':
2596 case '6':
2597 case '7':
2598 case '8':
2599 case '9':
2600 {
2601 /* It's a number. */
2602 int got_dot = 0, got_e = 0, toktype;
2603 const char *p = tokstart;
2604 int hex = input_radix > 10;
2605
2606 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
2607 {
2608 p += 2;
2609 hex = 1;
2610 }
2611 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
2612 {
2613 p += 2;
2614 hex = 0;
2615 }
2616
2617 for (;; ++p)
2618 {
2619 /* This test includes !hex because 'e' is a valid hex digit
2620 and thus does not indicate a floating point number when
2621 the radix is hex. */
2622 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
2623 got_dot = got_e = 1;
2624 /* This test does not include !hex, because a '.' always indicates
2625 a decimal floating point number regardless of the radix. */
2626 else if (!got_dot && *p == '.')
2627 got_dot = 1;
2628 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
2629 && (*p == '-' || *p == '+'))
2630 /* This is the sign of the exponent, not the end of the
2631 number. */
2632 continue;
2633 /* We will take any letters or digits. parse_number will
2634 complain if past the radix, or if L or U are not final. */
2635 else if ((*p < '0' || *p > '9')
2636 && ((*p < 'a' || *p > 'z')
2637 && (*p < 'A' || *p > 'Z')))
2638 break;
2639 }
2640 toktype = parse_number (par_state, tokstart, p - tokstart,
2641 got_dot|got_e, &yylval);
2642 if (toktype == ERROR)
2643 {
2644 char *err_copy = (char *) alloca (p - tokstart + 1);
2645
2646 memcpy (err_copy, tokstart, p - tokstart);
2647 err_copy[p - tokstart] = 0;
2648 error (_("Invalid number \"%s\"."), err_copy);
2649 }
2650 lexptr = p;
2651 return toktype;
2652 }
2653
2654 case '@':
2655 {
2656 const char *p = &tokstart[1];
2657 size_t len = strlen ("entry");
2658
2659 if (parse_language (par_state)->la_language == language_objc)
2660 {
2661 size_t len = strlen ("selector");
2662
2663 if (strncmp (p, "selector", len) == 0
2664 && (p[len] == '\0' || isspace (p[len])))
2665 {
2666 lexptr = p + len;
2667 return SELECTOR;
2668 }
2669 else if (*p == '"')
2670 goto parse_string;
2671 }
2672
2673 while (isspace (*p))
2674 p++;
2675 if (strncmp (p, "entry", len) == 0 && !isalnum (p[len])
2676 && p[len] != '_')
2677 {
2678 lexptr = &p[len];
2679 return ENTRY;
2680 }
2681 }
2682 /* FALLTHRU */
2683 case '+':
2684 case '-':
2685 case '*':
2686 case '/':
2687 case '%':
2688 case '|':
2689 case '&':
2690 case '^':
2691 case '~':
2692 case '!':
2693 case '<':
2694 case '>':
2695 case '?':
2696 case ':':
2697 case '=':
2698 case '{':
2699 case '}':
2700 symbol:
2701 lexptr++;
2702 return c;
2703
2704 case 'L':
2705 case 'u':
2706 case 'U':
2707 if (tokstart[1] != '"' && tokstart[1] != '\'')
2708 break;
2709 /* Fall through. */
2710 case '\'':
2711 case '"':
2712
2713 parse_string:
2714 {
2715 int host_len;
2716 int result = parse_string_or_char (tokstart, &lexptr, &yylval.tsval,
2717 &host_len);
2718 if (result == CHAR)
2719 {
2720 if (host_len == 0)
2721 error (_("Empty character constant."));
2722 else if (host_len > 2 && c == '\'')
2723 {
2724 ++tokstart;
2725 namelen = lexptr - tokstart - 1;
2726 *is_quoted_name = 1;
2727
2728 goto tryname;
2729 }
2730 else if (host_len > 1)
2731 error (_("Invalid character constant."));
2732 }
2733 return result;
2734 }
2735 }
2736
2737 if (!(c == '_' || c == '$'
2738 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
2739 /* We must have come across a bad character (e.g. ';'). */
2740 error (_("Invalid character '%c' in expression."), c);
2741
2742 /* It's a name. See how long it is. */
2743 namelen = 0;
2744 for (c = tokstart[namelen];
2745 (c == '_' || c == '$' || (c >= '0' && c <= '9')
2746 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
2747 {
2748 /* Template parameter lists are part of the name.
2749 FIXME: This mishandles `print $a<4&&$a>3'. */
2750
2751 if (c == '<')
2752 {
2753 if (! is_cast_operator (tokstart, namelen))
2754 {
2755 /* Scan ahead to get rest of the template specification. Note
2756 that we look ahead only when the '<' adjoins non-whitespace
2757 characters; for comparison expressions, e.g. "a < b > c",
2758 there must be spaces before the '<', etc. */
2759 const char *p = find_template_name_end (tokstart + namelen);
2760
2761 if (p)
2762 namelen = p - tokstart;
2763 }
2764 break;
2765 }
2766 c = tokstart[++namelen];
2767 }
2768
2769 /* The token "if" terminates the expression and is NOT removed from
2770 the input stream. It doesn't count if it appears in the
2771 expansion of a macro. */
2772 if (namelen == 2
2773 && tokstart[0] == 'i'
2774 && tokstart[1] == 'f'
2775 && ! scanning_macro_expansion ())
2776 {
2777 return 0;
2778 }
2779
2780 /* For the same reason (breakpoint conditions), "thread N"
2781 terminates the expression. "thread" could be an identifier, but
2782 an identifier is never followed by a number without intervening
2783 punctuation. "task" is similar. Handle abbreviations of these,
2784 similarly to breakpoint.c:find_condition_and_thread. */
2785 if (namelen >= 1
2786 && (strncmp (tokstart, "thread", namelen) == 0
2787 || strncmp (tokstart, "task", namelen) == 0)
2788 && (tokstart[namelen] == ' ' || tokstart[namelen] == '\t')
2789 && ! scanning_macro_expansion ())
2790 {
2791 const char *p = tokstart + namelen + 1;
2792
2793 while (*p == ' ' || *p == '\t')
2794 p++;
2795 if (*p >= '0' && *p <= '9')
2796 return 0;
2797 }
2798
2799 lexptr += namelen;
2800
2801 tryname:
2802
2803 yylval.sval.ptr = tokstart;
2804 yylval.sval.length = namelen;
2805
2806 /* Catch specific keywords. */
2807 copy = copy_name (yylval.sval);
2808 for (i = 0; i < sizeof ident_tokens / sizeof ident_tokens[0]; i++)
2809 if (strcmp (copy, ident_tokens[i].oper) == 0)
2810 {
2811 if ((ident_tokens[i].flags & FLAG_CXX) != 0
2812 && parse_language (par_state)->la_language != language_cplus)
2813 break;
2814
2815 if ((ident_tokens[i].flags & FLAG_SHADOW) != 0)
2816 {
2817 struct field_of_this_result is_a_field_of_this;
2818
2819 if (lookup_symbol (copy, expression_context_block,
2820 VAR_DOMAIN,
2821 (parse_language (par_state)->la_language
2822 == language_cplus ? &is_a_field_of_this
2823 : NULL)).symbol
2824 != NULL)
2825 {
2826 /* The keyword is shadowed. */
2827 break;
2828 }
2829 }
2830
2831 /* It is ok to always set this, even though we don't always
2832 strictly need to. */
2833 yylval.opcode = ident_tokens[i].opcode;
2834 return ident_tokens[i].token;
2835 }
2836
2837 if (*tokstart == '$')
2838 return VARIABLE;
2839
2840 if (parse_completion && *lexptr == '\0')
2841 saw_name_at_eof = 1;
2842
2843 yylval.ssym.stoken = yylval.sval;
2844 yylval.ssym.sym.symbol = NULL;
2845 yylval.ssym.sym.block = NULL;
2846 yylval.ssym.is_a_field_of_this = 0;
2847 return NAME;
2848 }
2849
2850 /* An object of this type is pushed on a FIFO by the "outer" lexer. */
2851 typedef struct
2852 {
2853 int token;
2854 YYSTYPE value;
2855 } token_and_value;
2856
2857 DEF_VEC_O (token_and_value);
2858
2859 /* A FIFO of tokens that have been read but not yet returned to the
2860 parser. */
2861 static VEC (token_and_value) *token_fifo;
2862
2863 /* Non-zero if the lexer should return tokens from the FIFO. */
2864 static int popping;
2865
2866 /* Temporary storage for c_lex; this holds symbol names as they are
2867 built up. */
2868 auto_obstack name_obstack;
2869
2870 /* Classify a NAME token. The contents of the token are in `yylval'.
2871 Updates yylval and returns the new token type. BLOCK is the block
2872 in which lookups start; this can be NULL to mean the global scope.
2873 IS_QUOTED_NAME is non-zero if the name token was originally quoted
2874 in single quotes. */
2875
2876 static int
2877 classify_name (struct parser_state *par_state, const struct block *block,
2878 int is_quoted_name)
2879 {
2880 struct block_symbol bsym;
2881 char *copy;
2882 struct field_of_this_result is_a_field_of_this;
2883
2884 copy = copy_name (yylval.sval);
2885
2886 /* Initialize this in case we *don't* use it in this call; that way
2887 we can refer to it unconditionally below. */
2888 memset (&is_a_field_of_this, 0, sizeof (is_a_field_of_this));
2889
2890 bsym = lookup_symbol (copy, block, VAR_DOMAIN,
2891 parse_language (par_state)->la_name_of_this
2892 ? &is_a_field_of_this : NULL);
2893
2894 if (bsym.symbol && SYMBOL_CLASS (bsym.symbol) == LOC_BLOCK)
2895 {
2896 yylval.ssym.sym = bsym;
2897 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
2898 return BLOCKNAME;
2899 }
2900 else if (!bsym.symbol)
2901 {
2902 /* If we found a field of 'this', we might have erroneously
2903 found a constructor where we wanted a type name. Handle this
2904 case by noticing that we found a constructor and then look up
2905 the type tag instead. */
2906 if (is_a_field_of_this.type != NULL
2907 && is_a_field_of_this.fn_field != NULL
2908 && TYPE_FN_FIELD_CONSTRUCTOR (is_a_field_of_this.fn_field->fn_fields,
2909 0))
2910 {
2911 struct field_of_this_result inner_is_a_field_of_this;
2912
2913 bsym = lookup_symbol (copy, block, STRUCT_DOMAIN,
2914 &inner_is_a_field_of_this);
2915 if (bsym.symbol != NULL)
2916 {
2917 yylval.tsym.type = SYMBOL_TYPE (bsym.symbol);
2918 return TYPENAME;
2919 }
2920 }
2921
2922 /* If we found a field, then we want to prefer it over a
2923 filename. However, if the name was quoted, then it is better
2924 to check for a filename or a block, since this is the only
2925 way the user has of requiring the extension to be used. */
2926 if (is_a_field_of_this.type == NULL || is_quoted_name)
2927 {
2928 /* See if it's a file name. */
2929 struct symtab *symtab;
2930
2931 symtab = lookup_symtab (copy);
2932 if (symtab)
2933 {
2934 yylval.bval = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (symtab),
2935 STATIC_BLOCK);
2936 return FILENAME;
2937 }
2938 }
2939 }
2940
2941 if (bsym.symbol && SYMBOL_CLASS (bsym.symbol) == LOC_TYPEDEF)
2942 {
2943 yylval.tsym.type = SYMBOL_TYPE (bsym.symbol);
2944 return TYPENAME;
2945 }
2946
2947 /* See if it's an ObjC classname. */
2948 if (parse_language (par_state)->la_language == language_objc && !bsym.symbol)
2949 {
2950 CORE_ADDR Class = lookup_objc_class (parse_gdbarch (par_state), copy);
2951 if (Class)
2952 {
2953 struct symbol *sym;
2954
2955 yylval.theclass.theclass = Class;
2956 sym = lookup_struct_typedef (copy, expression_context_block, 1);
2957 if (sym)
2958 yylval.theclass.type = SYMBOL_TYPE (sym);
2959 return CLASSNAME;
2960 }
2961 }
2962
2963 /* Input names that aren't symbols but ARE valid hex numbers, when
2964 the input radix permits them, can be names or numbers depending
2965 on the parse. Note we support radixes > 16 here. */
2966 if (!bsym.symbol
2967 && ((copy[0] >= 'a' && copy[0] < 'a' + input_radix - 10)
2968 || (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10)))
2969 {
2970 YYSTYPE newlval; /* Its value is ignored. */
2971 int hextype = parse_number (par_state, copy, yylval.sval.length,
2972 0, &newlval);
2973
2974 if (hextype == INT)
2975 {
2976 yylval.ssym.sym = bsym;
2977 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
2978 return NAME_OR_INT;
2979 }
2980 }
2981
2982 /* Any other kind of symbol */
2983 yylval.ssym.sym = bsym;
2984 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
2985
2986 if (bsym.symbol == NULL
2987 && parse_language (par_state)->la_language == language_cplus
2988 && is_a_field_of_this.type == NULL
2989 && lookup_minimal_symbol (copy, NULL, NULL).minsym == NULL)
2990 return UNKNOWN_CPP_NAME;
2991
2992 return NAME;
2993 }
2994
2995 /* Like classify_name, but used by the inner loop of the lexer, when a
2996 name might have already been seen. CONTEXT is the context type, or
2997 NULL if this is the first component of a name. */
2998
2999 static int
3000 classify_inner_name (struct parser_state *par_state,
3001 const struct block *block, struct type *context)
3002 {
3003 struct type *type;
3004 char *copy;
3005
3006 if (context == NULL)
3007 return classify_name (par_state, block, 0);
3008
3009 type = check_typedef (context);
3010 if (!type_aggregate_p (type))
3011 return ERROR;
3012
3013 copy = copy_name (yylval.ssym.stoken);
3014 /* N.B. We assume the symbol can only be in VAR_DOMAIN. */
3015 yylval.ssym.sym = cp_lookup_nested_symbol (type, copy, block, VAR_DOMAIN);
3016
3017 /* If no symbol was found, search for a matching base class named
3018 COPY. This will allow users to enter qualified names of class members
3019 relative to the `this' pointer. */
3020 if (yylval.ssym.sym.symbol == NULL)
3021 {
3022 struct type *base_type = cp_find_type_baseclass_by_name (type, copy);
3023
3024 if (base_type != NULL)
3025 {
3026 yylval.tsym.type = base_type;
3027 return TYPENAME;
3028 }
3029
3030 return ERROR;
3031 }
3032
3033 switch (SYMBOL_CLASS (yylval.ssym.sym.symbol))
3034 {
3035 case LOC_BLOCK:
3036 case LOC_LABEL:
3037 /* cp_lookup_nested_symbol might have accidentally found a constructor
3038 named COPY when we really wanted a base class of the same name.
3039 Double-check this case by looking for a base class. */
3040 {
3041 struct type *base_type = cp_find_type_baseclass_by_name (type, copy);
3042
3043 if (base_type != NULL)
3044 {
3045 yylval.tsym.type = base_type;
3046 return TYPENAME;
3047 }
3048 }
3049 return ERROR;
3050
3051 case LOC_TYPEDEF:
3052 yylval.tsym.type = SYMBOL_TYPE (yylval.ssym.sym.symbol);
3053 return TYPENAME;
3054
3055 default:
3056 return NAME;
3057 }
3058 internal_error (__FILE__, __LINE__, _("not reached"));
3059 }
3060
3061 /* The outer level of a two-level lexer. This calls the inner lexer
3062 to return tokens. It then either returns these tokens, or
3063 aggregates them into a larger token. This lets us work around a
3064 problem in our parsing approach, where the parser could not
3065 distinguish between qualified names and qualified types at the
3066 right point.
3067
3068 This approach is still not ideal, because it mishandles template
3069 types. See the comment in lex_one_token for an example. However,
3070 this is still an improvement over the earlier approach, and will
3071 suffice until we move to better parsing technology. */
3072
3073 static int
3074 yylex (void)
3075 {
3076 token_and_value current;
3077 int first_was_coloncolon, last_was_coloncolon;
3078 struct type *context_type = NULL;
3079 int last_to_examine, next_to_examine, checkpoint;
3080 const struct block *search_block;
3081 int is_quoted_name;
3082
3083 if (popping && !VEC_empty (token_and_value, token_fifo))
3084 goto do_pop;
3085 popping = 0;
3086
3087 /* Read the first token and decide what to do. Most of the
3088 subsequent code is C++-only; but also depends on seeing a "::" or
3089 name-like token. */
3090 current.token = lex_one_token (pstate, &is_quoted_name);
3091 if (current.token == NAME)
3092 current.token = classify_name (pstate, expression_context_block,
3093 is_quoted_name);
3094 if (parse_language (pstate)->la_language != language_cplus
3095 || (current.token != TYPENAME && current.token != COLONCOLON
3096 && current.token != FILENAME))
3097 return current.token;
3098
3099 /* Read any sequence of alternating "::" and name-like tokens into
3100 the token FIFO. */
3101 current.value = yylval;
3102 VEC_safe_push (token_and_value, token_fifo, &current);
3103 last_was_coloncolon = current.token == COLONCOLON;
3104 while (1)
3105 {
3106 int ignore;
3107
3108 /* We ignore quoted names other than the very first one.
3109 Subsequent ones do not have any special meaning. */
3110 current.token = lex_one_token (pstate, &ignore);
3111 current.value = yylval;
3112 VEC_safe_push (token_and_value, token_fifo, &current);
3113
3114 if ((last_was_coloncolon && current.token != NAME)
3115 || (!last_was_coloncolon && current.token != COLONCOLON))
3116 break;
3117 last_was_coloncolon = !last_was_coloncolon;
3118 }
3119 popping = 1;
3120
3121 /* We always read one extra token, so compute the number of tokens
3122 to examine accordingly. */
3123 last_to_examine = VEC_length (token_and_value, token_fifo) - 2;
3124 next_to_examine = 0;
3125
3126 current = *VEC_index (token_and_value, token_fifo, next_to_examine);
3127 ++next_to_examine;
3128
3129 name_obstack.clear ();
3130 checkpoint = 0;
3131 if (current.token == FILENAME)
3132 search_block = current.value.bval;
3133 else if (current.token == COLONCOLON)
3134 search_block = NULL;
3135 else
3136 {
3137 gdb_assert (current.token == TYPENAME);
3138 search_block = expression_context_block;
3139 obstack_grow (&name_obstack, current.value.sval.ptr,
3140 current.value.sval.length);
3141 context_type = current.value.tsym.type;
3142 checkpoint = 1;
3143 }
3144
3145 first_was_coloncolon = current.token == COLONCOLON;
3146 last_was_coloncolon = first_was_coloncolon;
3147
3148 while (next_to_examine <= last_to_examine)
3149 {
3150 token_and_value *next;
3151
3152 next = VEC_index (token_and_value, token_fifo, next_to_examine);
3153 ++next_to_examine;
3154
3155 if (next->token == NAME && last_was_coloncolon)
3156 {
3157 int classification;
3158
3159 yylval = next->value;
3160 classification = classify_inner_name (pstate, search_block,
3161 context_type);
3162 /* We keep going until we either run out of names, or until
3163 we have a qualified name which is not a type. */
3164 if (classification != TYPENAME && classification != NAME)
3165 break;
3166
3167 /* Accept up to this token. */
3168 checkpoint = next_to_examine;
3169
3170 /* Update the partial name we are constructing. */
3171 if (context_type != NULL)
3172 {
3173 /* We don't want to put a leading "::" into the name. */
3174 obstack_grow_str (&name_obstack, "::");
3175 }
3176 obstack_grow (&name_obstack, next->value.sval.ptr,
3177 next->value.sval.length);
3178
3179 yylval.sval.ptr = (const char *) obstack_base (&name_obstack);
3180 yylval.sval.length = obstack_object_size (&name_obstack);
3181 current.value = yylval;
3182 current.token = classification;
3183
3184 last_was_coloncolon = 0;
3185
3186 if (classification == NAME)
3187 break;
3188
3189 context_type = yylval.tsym.type;
3190 }
3191 else if (next->token == COLONCOLON && !last_was_coloncolon)
3192 last_was_coloncolon = 1;
3193 else
3194 {
3195 /* We've reached the end of the name. */
3196 break;
3197 }
3198 }
3199
3200 /* If we have a replacement token, install it as the first token in
3201 the FIFO, and delete the other constituent tokens. */
3202 if (checkpoint > 0)
3203 {
3204 current.value.sval.ptr
3205 = (const char *) obstack_copy0 (&expansion_obstack,
3206 current.value.sval.ptr,
3207 current.value.sval.length);
3208
3209 VEC_replace (token_and_value, token_fifo, 0, &current);
3210 if (checkpoint > 1)
3211 VEC_block_remove (token_and_value, token_fifo, 1, checkpoint - 1);
3212 }
3213
3214 do_pop:
3215 current = *VEC_index (token_and_value, token_fifo, 0);
3216 VEC_ordered_remove (token_and_value, token_fifo, 0);
3217 yylval = current.value;
3218 return current.token;
3219 }
3220
3221 int
3222 c_parse (struct parser_state *par_state)
3223 {
3224 int result;
3225 struct cleanup *back_to;
3226
3227 /* Setting up the parser state. */
3228 scoped_restore pstate_restore = make_scoped_restore (&pstate);
3229 gdb_assert (par_state != NULL);
3230 pstate = par_state;
3231
3232 /* Note that parsing (within yyparse) freely installs cleanups
3233 assuming they'll be run here (below). */
3234
3235 back_to = make_cleanup (free_current_contents, &expression_macro_scope);
3236
3237 /* Set up the scope for macro expansion. */
3238 expression_macro_scope = NULL;
3239
3240 if (expression_context_block)
3241 expression_macro_scope
3242 = sal_macro_scope (find_pc_line (expression_context_pc, 0));
3243 else
3244 expression_macro_scope = default_macro_scope ();
3245 if (! expression_macro_scope)
3246 expression_macro_scope = user_macro_scope ();
3247
3248 /* Initialize macro expansion code. */
3249 obstack_init (&expansion_obstack);
3250 gdb_assert (! macro_original_text);
3251 make_cleanup (scan_macro_cleanup, 0);
3252
3253 scoped_restore restore_yydebug = make_scoped_restore (&yydebug,
3254 parser_debug);
3255
3256 /* Initialize some state used by the lexer. */
3257 last_was_structop = 0;
3258 saw_name_at_eof = 0;
3259
3260 VEC_free (token_and_value, token_fifo);
3261 popping = 0;
3262 name_obstack.clear ();
3263
3264 result = yyparse ();
3265 do_cleanups (back_to);
3266
3267 return result;
3268 }
3269
3270 #ifdef YYBISON
3271
3272 /* This is called via the YYPRINT macro when parser debugging is
3273 enabled. It prints a token's value. */
3274
3275 static void
3276 c_print_token (FILE *file, int type, YYSTYPE value)
3277 {
3278 switch (type)
3279 {
3280 case INT:
3281 parser_fprintf (file, "typed_val_int<%s, %s>",
3282 TYPE_SAFE_NAME (value.typed_val_int.type),
3283 pulongest (value.typed_val_int.val));
3284 break;
3285
3286 case CHAR:
3287 case STRING:
3288 {
3289 char *copy = (char *) alloca (value.tsval.length + 1);
3290
3291 memcpy (copy, value.tsval.ptr, value.tsval.length);
3292 copy[value.tsval.length] = '\0';
3293
3294 parser_fprintf (file, "tsval<type=%d, %s>", value.tsval.type, copy);
3295 }
3296 break;
3297
3298 case NSSTRING:
3299 case VARIABLE:
3300 parser_fprintf (file, "sval<%s>", copy_name (value.sval));
3301 break;
3302
3303 case TYPENAME:
3304 parser_fprintf (file, "tsym<type=%s, name=%s>",
3305 TYPE_SAFE_NAME (value.tsym.type),
3306 copy_name (value.tsym.stoken));
3307 break;
3308
3309 case NAME:
3310 case UNKNOWN_CPP_NAME:
3311 case NAME_OR_INT:
3312 case BLOCKNAME:
3313 parser_fprintf (file, "ssym<name=%s, sym=%s, field_of_this=%d>",
3314 copy_name (value.ssym.stoken),
3315 (value.ssym.sym.symbol == NULL
3316 ? "(null)" : SYMBOL_PRINT_NAME (value.ssym.sym.symbol)),
3317 value.ssym.is_a_field_of_this);
3318 break;
3319
3320 case FILENAME:
3321 parser_fprintf (file, "bval<%s>", host_address_to_string (value.bval));
3322 break;
3323 }
3324 }
3325
3326 #endif
3327
3328 void
3329 yyerror (const char *msg)
3330 {
3331 if (prev_lexptr)
3332 lexptr = prev_lexptr;
3333
3334 error (_("A %s in expression, near `%s'."), (msg ? msg : "error"), lexptr);
3335 }
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