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manual copyright year range of various GDB files to add 2023
[binutils-gdb.git] / gdb / c-exp.y
blob00599b0da7fa57b7486bcdaa1b6121b6d3794141
1 /* YACC parser for C expressions, for GDB.
2 Copyright (C) 1986-2023 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 "c-support.h"
46 #include "bfd.h" /* Required by objfiles.h. */
47 #include "symfile.h" /* Required by objfiles.h. */
48 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
49 #include "charset.h"
50 #include "block.h"
51 #include "cp-support.h"
52 #include "macroscope.h"
53 #include "objc-lang.h"
54 #include "typeprint.h"
55 #include "cp-abi.h"
56 #include "type-stack.h"
57 #include "target-float.h"
58 #include "c-exp.h"
59
60 #define parse_type(ps) builtin_type (ps->gdbarch ())
61
62 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
63 etc). */
64 #define GDB_YY_REMAP_PREFIX c_
65 #include "yy-remap.h"
66
67 /* The state of the parser, used internally when we are parsing the
68 expression. */
69
70 static struct parser_state *pstate = NULL;
71
72 /* Data that must be held for the duration of a parse. */
73
74 struct c_parse_state
75 {
76 /* These are used to hold type lists and type stacks that are
77 allocated during the parse. */
78 std::vector<std::unique_ptr<std::vector<struct type *>>> type_lists;
79 std::vector<std::unique_ptr<struct type_stack>> type_stacks;
80
81 /* Storage for some strings allocated during the parse. */
82 std::vector<gdb::unique_xmalloc_ptr<char>> strings;
83
84 /* When we find that lexptr (the global var defined in parse.c) is
85 pointing at a macro invocation, we expand the invocation, and call
86 scan_macro_expansion to save the old lexptr here and point lexptr
87 into the expanded text. When we reach the end of that, we call
88 end_macro_expansion to pop back to the value we saved here. The
89 macro expansion code promises to return only fully-expanded text,
90 so we don't need to "push" more than one level.
91
92 This is disgusting, of course. It would be cleaner to do all macro
93 expansion beforehand, and then hand that to lexptr. But we don't
94 really know where the expression ends. Remember, in a command like
95
96 (gdb) break *ADDRESS if CONDITION
97
98 we evaluate ADDRESS in the scope of the current frame, but we
99 evaluate CONDITION in the scope of the breakpoint's location. So
100 it's simply wrong to try to macro-expand the whole thing at once. */
101 const char *macro_original_text = nullptr;
102
103 /* We save all intermediate macro expansions on this obstack for the
104 duration of a single parse. The expansion text may sometimes have
105 to live past the end of the expansion, due to yacc lookahead.
106 Rather than try to be clever about saving the data for a single
107 token, we simply keep it all and delete it after parsing has
108 completed. */
109 auto_obstack expansion_obstack;
110
111 /* The type stack. */
112 struct type_stack type_stack;
113 };
114
115 /* This is set and cleared in c_parse. */
116
117 static struct c_parse_state *cpstate;
118
119 int yyparse (void);
120
121 static int yylex (void);
122
123 static void yyerror (const char *);
124
125 static int type_aggregate_p (struct type *);
126
127 using namespace expr;
128 %}
129
130 /* Although the yacc "value" of an expression is not used,
131 since the result is stored in the structure being created,
132 other node types do have values. */
133
134 %union
135 {
136 LONGEST lval;
137 struct {
138 LONGEST val;
139 struct type *type;
140 } typed_val_int;
141 struct {
142 gdb_byte val[16];
143 struct type *type;
144 } typed_val_float;
145 struct type *tval;
146 struct stoken sval;
147 struct typed_stoken tsval;
148 struct ttype tsym;
149 struct symtoken ssym;
150 int voidval;
151 const struct block *bval;
152 enum exp_opcode opcode;
153
154 struct stoken_vector svec;
155 std::vector<struct type *> *tvec;
156
157 struct type_stack *type_stack;
158
159 struct objc_class_str theclass;
160 }
161
162 %{
163 /* YYSTYPE gets defined by %union */
164 static int parse_number (struct parser_state *par_state,
165 const char *, int, int, YYSTYPE *);
166 static struct stoken operator_stoken (const char *);
167 static struct stoken typename_stoken (const char *);
168 static void check_parameter_typelist (std::vector<struct type *> *);
169
170 #if defined(YYBISON) && YYBISON < 30800
171 static void c_print_token (FILE *file, int type, YYSTYPE value);
172 #define YYPRINT(FILE, TYPE, VALUE) c_print_token (FILE, TYPE, VALUE)
173 #endif
174 %}
175
176 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly function_method
177 %type <lval> rcurly
178 %type <tval> type typebase scalar_type
179 %type <tvec> nonempty_typelist func_mod parameter_typelist
180 /* %type <bval> block */
181
182 /* Fancy type parsing. */
183 %type <tval> ptype
184 %type <lval> array_mod
185 %type <tval> conversion_type_id
186
187 %type <type_stack> ptr_operator_ts abs_decl direct_abs_decl
188
189 %token <typed_val_int> INT COMPLEX_INT
190 %token <typed_val_float> FLOAT COMPLEX_FLOAT
191
192 /* Both NAME and TYPENAME tokens represent symbols in the input,
193 and both convey their data as strings.
194 But a TYPENAME is a string that happens to be defined as a typedef
195 or builtin type name (such as int or char)
196 and a NAME is any other symbol.
197 Contexts where this distinction is not important can use the
198 nonterminal "name", which matches either NAME or TYPENAME. */
199
200 %token <tsval> STRING
201 %token <sval> NSSTRING /* ObjC Foundation "NSString" literal */
202 %token SELECTOR /* ObjC "@selector" pseudo-operator */
203 %token <tsval> CHAR
204 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
205 %token <ssym> UNKNOWN_CPP_NAME
206 %token <voidval> COMPLETE
207 %token <tsym> TYPENAME
208 %token <theclass> CLASSNAME /* ObjC Class name */
209 %type <sval> name field_name
210 %type <svec> string_exp
211 %type <ssym> name_not_typename
212 %type <tsym> type_name
213
214 /* This is like a '[' token, but is only generated when parsing
215 Objective C. This lets us reuse the same parser without
216 erroneously parsing ObjC-specific expressions in C. */
217 %token OBJC_LBRAC
218
219 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
220 but which would parse as a valid number in the current input radix.
221 E.g. "c" when input_radix==16. Depending on the parse, it will be
222 turned into a name or into a number. */
223
224 %token <ssym> NAME_OR_INT
225
226 %token OPERATOR
227 %token STRUCT CLASS UNION ENUM SIZEOF ALIGNOF UNSIGNED COLONCOLON
228 %token TEMPLATE
229 %token ERROR
230 %token NEW DELETE
231 %type <sval> oper
232 %token REINTERPRET_CAST DYNAMIC_CAST STATIC_CAST CONST_CAST
233 %token ENTRY
234 %token TYPEOF
235 %token DECLTYPE
236 %token TYPEID
237
238 /* Special type cases, put in to allow the parser to distinguish different
239 legal basetypes. */
240 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
241 %token RESTRICT ATOMIC
242 %token FLOAT_KEYWORD COMPLEX
243
244 %token <sval> DOLLAR_VARIABLE
245
246 %token <opcode> ASSIGN_MODIFY
247
248 /* C++ */
249 %token TRUEKEYWORD
250 %token FALSEKEYWORD
251
252
253 %left ','
254 %left ABOVE_COMMA
255 %right '=' ASSIGN_MODIFY
256 %right '?'
257 %left OROR
258 %left ANDAND
259 %left '|'
260 %left '^'
261 %left '&'
262 %left EQUAL NOTEQUAL
263 %left '<' '>' LEQ GEQ
264 %left LSH RSH
265 %left '@'
266 %left '+' '-'
267 %left '*' '/' '%'
268 %right UNARY INCREMENT DECREMENT
269 %right ARROW ARROW_STAR '.' DOT_STAR '[' OBJC_LBRAC '('
270 %token <ssym> BLOCKNAME
271 %token <bval> FILENAME
272 %type <bval> block
273 %left COLONCOLON
274
275 %token DOTDOTDOT
276
277 \f
278 %%
279
280 start : exp1
281 | type_exp
282 ;
283
284 type_exp: type
285 {
286 pstate->push_new<type_operation> ($1);
287 }
288 | TYPEOF '(' exp ')'
289 {
290 pstate->wrap<typeof_operation> ();
291 }
292 | TYPEOF '(' type ')'
293 {
294 pstate->push_new<type_operation> ($3);
295 }
296 | DECLTYPE '(' exp ')'
297 {
298 pstate->wrap<decltype_operation> ();
299 }
300 ;
301
302 /* Expressions, including the comma operator. */
303 exp1 : exp
304 | exp1 ',' exp
305 { pstate->wrap2<comma_operation> (); }
306 ;
307
308 /* Expressions, not including the comma operator. */
309 exp : '*' exp %prec UNARY
310 { pstate->wrap<unop_ind_operation> (); }
311 ;
312
313 exp : '&' exp %prec UNARY
314 { pstate->wrap<unop_addr_operation> (); }
315 ;
316
317 exp : '-' exp %prec UNARY
318 { pstate->wrap<unary_neg_operation> (); }
319 ;
320
321 exp : '+' exp %prec UNARY
322 { pstate->wrap<unary_plus_operation> (); }
323 ;
324
325 exp : '!' exp %prec UNARY
326 {
327 if (pstate->language ()->la_language
328 == language_opencl)
329 pstate->wrap<opencl_not_operation> ();
330 else
331 pstate->wrap<unary_logical_not_operation> ();
332 }
333 ;
334
335 exp : '~' exp %prec UNARY
336 { pstate->wrap<unary_complement_operation> (); }
337 ;
338
339 exp : INCREMENT exp %prec UNARY
340 { pstate->wrap<preinc_operation> (); }
341 ;
342
343 exp : DECREMENT exp %prec UNARY
344 { pstate->wrap<predec_operation> (); }
345 ;
346
347 exp : exp INCREMENT %prec UNARY
348 { pstate->wrap<postinc_operation> (); }
349 ;
350
351 exp : exp DECREMENT %prec UNARY
352 { pstate->wrap<postdec_operation> (); }
353 ;
354
355 exp : TYPEID '(' exp ')' %prec UNARY
356 { pstate->wrap<typeid_operation> (); }
357 ;
358
359 exp : TYPEID '(' type_exp ')' %prec UNARY
360 { pstate->wrap<typeid_operation> (); }
361 ;
362
363 exp : SIZEOF exp %prec UNARY
364 { pstate->wrap<unop_sizeof_operation> (); }
365 ;
366
367 exp : ALIGNOF '(' type_exp ')' %prec UNARY
368 { pstate->wrap<unop_alignof_operation> (); }
369 ;
370
371 exp : exp ARROW field_name
372 {
373 pstate->push_new<structop_ptr_operation>
374 (pstate->pop (), copy_name ($3));
375 }
376 ;
377
378 exp : exp ARROW field_name COMPLETE
379 {
380 structop_base_operation *op
381 = new structop_ptr_operation (pstate->pop (),
382 copy_name ($3));
383 pstate->mark_struct_expression (op);
384 pstate->push (operation_up (op));
385 }
386 ;
387
388 exp : exp ARROW COMPLETE
389 {
390 structop_base_operation *op
391 = new structop_ptr_operation (pstate->pop (), "");
392 pstate->mark_struct_expression (op);
393 pstate->push (operation_up (op));
394 }
395 ;
396
397 exp : exp ARROW '~' name
398 {
399 pstate->push_new<structop_ptr_operation>
400 (pstate->pop (), "~" + copy_name ($4));
401 }
402 ;
403
404 exp : exp ARROW '~' name COMPLETE
405 {
406 structop_base_operation *op
407 = new structop_ptr_operation (pstate->pop (),
408 "~" + copy_name ($4));
409 pstate->mark_struct_expression (op);
410 pstate->push (operation_up (op));
411 }
412 ;
413
414 exp : exp ARROW qualified_name
415 { /* exp->type::name becomes exp->*(&type::name) */
416 /* Note: this doesn't work if name is a
417 static member! FIXME */
418 pstate->wrap<unop_addr_operation> ();
419 pstate->wrap2<structop_mptr_operation> (); }
420 ;
421
422 exp : exp ARROW_STAR exp
423 { pstate->wrap2<structop_mptr_operation> (); }
424 ;
425
426 exp : exp '.' field_name
427 {
428 if (pstate->language ()->la_language
429 == language_opencl)
430 pstate->push_new<opencl_structop_operation>
431 (pstate->pop (), copy_name ($3));
432 else
433 pstate->push_new<structop_operation>
434 (pstate->pop (), copy_name ($3));
435 }
436 ;
437
438 exp : exp '.' field_name COMPLETE
439 {
440 structop_base_operation *op
441 = new structop_operation (pstate->pop (),
442 copy_name ($3));
443 pstate->mark_struct_expression (op);
444 pstate->push (operation_up (op));
445 }
446 ;
447
448 exp : exp '.' COMPLETE
449 {
450 structop_base_operation *op
451 = new structop_operation (pstate->pop (), "");
452 pstate->mark_struct_expression (op);
453 pstate->push (operation_up (op));
454 }
455 ;
456
457 exp : exp '.' '~' name
458 {
459 pstate->push_new<structop_operation>
460 (pstate->pop (), "~" + copy_name ($4));
461 }
462 ;
463
464 exp : exp '.' '~' name COMPLETE
465 {
466 structop_base_operation *op
467 = new structop_operation (pstate->pop (),
468 "~" + copy_name ($4));
469 pstate->mark_struct_expression (op);
470 pstate->push (operation_up (op));
471 }
472 ;
473
474 exp : exp '.' qualified_name
475 { /* exp.type::name becomes exp.*(&type::name) */
476 /* Note: this doesn't work if name is a
477 static member! FIXME */
478 pstate->wrap<unop_addr_operation> ();
479 pstate->wrap2<structop_member_operation> (); }
480 ;
481
482 exp : exp DOT_STAR exp
483 { pstate->wrap2<structop_member_operation> (); }
484 ;
485
486 exp : exp '[' exp1 ']'
487 { pstate->wrap2<subscript_operation> (); }
488 ;
489
490 exp : exp OBJC_LBRAC exp1 ']'
491 { pstate->wrap2<subscript_operation> (); }
492 ;
493
494 /*
495 * The rules below parse ObjC message calls of the form:
496 * '[' target selector {':' argument}* ']'
497 */
498
499 exp : OBJC_LBRAC TYPENAME
500 {
501 CORE_ADDR theclass;
502
503 std::string copy = copy_name ($2.stoken);
504 theclass = lookup_objc_class (pstate->gdbarch (),
505 copy.c_str ());
506 if (theclass == 0)
507 error (_("%s is not an ObjC Class"),
508 copy.c_str ());
509 pstate->push_new<long_const_operation>
510 (parse_type (pstate)->builtin_int,
511 (LONGEST) theclass);
512 start_msglist();
513 }
514 msglist ']'
515 { end_msglist (pstate); }
516 ;
517
518 exp : OBJC_LBRAC CLASSNAME
519 {
520 pstate->push_new<long_const_operation>
521 (parse_type (pstate)->builtin_int,
522 (LONGEST) $2.theclass);
523 start_msglist();
524 }
525 msglist ']'
526 { end_msglist (pstate); }
527 ;
528
529 exp : OBJC_LBRAC exp
530 { start_msglist(); }
531 msglist ']'
532 { end_msglist (pstate); }
533 ;
534
535 msglist : name
536 { add_msglist(&$1, 0); }
537 | msgarglist
538 ;
539
540 msgarglist : msgarg
541 | msgarglist msgarg
542 ;
543
544 msgarg : name ':' exp
545 { add_msglist(&$1, 1); }
546 | ':' exp /* Unnamed arg. */
547 { add_msglist(0, 1); }
548 | ',' exp /* Variable number of args. */
549 { add_msglist(0, 0); }
550 ;
551
552 exp : exp '('
553 /* This is to save the value of arglist_len
554 being accumulated by an outer function call. */
555 { pstate->start_arglist (); }
556 arglist ')' %prec ARROW
557 {
558 std::vector<operation_up> args
559 = pstate->pop_vector (pstate->end_arglist ());
560 pstate->push_new<funcall_operation>
561 (pstate->pop (), std::move (args));
562 }
563 ;
564
565 /* This is here to disambiguate with the production for
566 "func()::static_var" further below, which uses
567 function_method_void. */
568 exp : exp '(' ')' %prec ARROW
569 {
570 pstate->push_new<funcall_operation>
571 (pstate->pop (), std::vector<operation_up> ());
572 }
573 ;
574
575
576 exp : UNKNOWN_CPP_NAME '('
577 {
578 /* This could potentially be a an argument defined
579 lookup function (Koenig). */
580 /* This is to save the value of arglist_len
581 being accumulated by an outer function call. */
582 pstate->start_arglist ();
583 }
584 arglist ')' %prec ARROW
585 {
586 std::vector<operation_up> args
587 = pstate->pop_vector (pstate->end_arglist ());
588 pstate->push_new<adl_func_operation>
589 (copy_name ($1.stoken),
590 pstate->expression_context_block,
591 std::move (args));
592 }
593 ;
594
595 lcurly : '{'
596 { pstate->start_arglist (); }
597 ;
598
599 arglist :
600 ;
601
602 arglist : exp
603 { pstate->arglist_len = 1; }
604 ;
605
606 arglist : arglist ',' exp %prec ABOVE_COMMA
607 { pstate->arglist_len++; }
608 ;
609
610 function_method: exp '(' parameter_typelist ')' const_or_volatile
611 {
612 std::vector<struct type *> *type_list = $3;
613 /* Save the const/volatile qualifiers as
614 recorded by the const_or_volatile
615 production's actions. */
616 type_instance_flags flags
617 = (cpstate->type_stack
618 .follow_type_instance_flags ());
619 pstate->push_new<type_instance_operation>
620 (flags, std::move (*type_list),
621 pstate->pop ());
622 }
623 ;
624
625 function_method_void: exp '(' ')' const_or_volatile
626 {
627 type_instance_flags flags
628 = (cpstate->type_stack
629 .follow_type_instance_flags ());
630 pstate->push_new<type_instance_operation>
631 (flags, std::vector<type *> (), pstate->pop ());
632 }
633 ;
634
635 exp : function_method
636 ;
637
638 /* Normally we must interpret "func()" as a function call, instead of
639 a type. The user needs to write func(void) to disambiguate.
640 However, in the "func()::static_var" case, there's no
641 ambiguity. */
642 function_method_void_or_typelist: function_method
643 | function_method_void
644 ;
645
646 exp : function_method_void_or_typelist COLONCOLON name
647 {
648 pstate->push_new<func_static_var_operation>
649 (pstate->pop (), copy_name ($3));
650 }
651 ;
652
653 rcurly : '}'
654 { $$ = pstate->end_arglist () - 1; }
655 ;
656 exp : lcurly arglist rcurly %prec ARROW
657 {
658 std::vector<operation_up> args
659 = pstate->pop_vector ($3 + 1);
660 pstate->push_new<array_operation> (0, $3,
661 std::move (args));
662 }
663 ;
664
665 exp : lcurly type_exp rcurly exp %prec UNARY
666 { pstate->wrap2<unop_memval_type_operation> (); }
667 ;
668
669 exp : '(' type_exp ')' exp %prec UNARY
670 {
671 if (pstate->language ()->la_language
672 == language_opencl)
673 pstate->wrap2<opencl_cast_type_operation> ();
674 else
675 pstate->wrap2<unop_cast_type_operation> ();
676 }
677 ;
678
679 exp : '(' exp1 ')'
680 { }
681 ;
682
683 /* Binary operators in order of decreasing precedence. */
684
685 exp : exp '@' exp
686 { pstate->wrap2<repeat_operation> (); }
687 ;
688
689 exp : exp '*' exp
690 { pstate->wrap2<mul_operation> (); }
691 ;
692
693 exp : exp '/' exp
694 { pstate->wrap2<div_operation> (); }
695 ;
696
697 exp : exp '%' exp
698 { pstate->wrap2<rem_operation> (); }
699 ;
700
701 exp : exp '+' exp
702 { pstate->wrap2<add_operation> (); }
703 ;
704
705 exp : exp '-' exp
706 { pstate->wrap2<sub_operation> (); }
707 ;
708
709 exp : exp LSH exp
710 { pstate->wrap2<lsh_operation> (); }
711 ;
712
713 exp : exp RSH exp
714 { pstate->wrap2<rsh_operation> (); }
715 ;
716
717 exp : exp EQUAL exp
718 {
719 if (pstate->language ()->la_language
720 == language_opencl)
721 pstate->wrap2<opencl_equal_operation> ();
722 else
723 pstate->wrap2<equal_operation> ();
724 }
725 ;
726
727 exp : exp NOTEQUAL exp
728 {
729 if (pstate->language ()->la_language
730 == language_opencl)
731 pstate->wrap2<opencl_notequal_operation> ();
732 else
733 pstate->wrap2<notequal_operation> ();
734 }
735 ;
736
737 exp : exp LEQ exp
738 {
739 if (pstate->language ()->la_language
740 == language_opencl)
741 pstate->wrap2<opencl_leq_operation> ();
742 else
743 pstate->wrap2<leq_operation> ();
744 }
745 ;
746
747 exp : exp GEQ exp
748 {
749 if (pstate->language ()->la_language
750 == language_opencl)
751 pstate->wrap2<opencl_geq_operation> ();
752 else
753 pstate->wrap2<geq_operation> ();
754 }
755 ;
756
757 exp : exp '<' exp
758 {
759 if (pstate->language ()->la_language
760 == language_opencl)
761 pstate->wrap2<opencl_less_operation> ();
762 else
763 pstate->wrap2<less_operation> ();
764 }
765 ;
766
767 exp : exp '>' exp
768 {
769 if (pstate->language ()->la_language
770 == language_opencl)
771 pstate->wrap2<opencl_gtr_operation> ();
772 else
773 pstate->wrap2<gtr_operation> ();
774 }
775 ;
776
777 exp : exp '&' exp
778 { pstate->wrap2<bitwise_and_operation> (); }
779 ;
780
781 exp : exp '^' exp
782 { pstate->wrap2<bitwise_xor_operation> (); }
783 ;
784
785 exp : exp '|' exp
786 { pstate->wrap2<bitwise_ior_operation> (); }
787 ;
788
789 exp : exp ANDAND exp
790 {
791 if (pstate->language ()->la_language
792 == language_opencl)
793 {
794 operation_up rhs = pstate->pop ();
795 operation_up lhs = pstate->pop ();
796 pstate->push_new<opencl_logical_binop_operation>
797 (BINOP_LOGICAL_AND, std::move (lhs),
798 std::move (rhs));
799 }
800 else
801 pstate->wrap2<logical_and_operation> ();
802 }
803 ;
804
805 exp : exp OROR exp
806 {
807 if (pstate->language ()->la_language
808 == language_opencl)
809 {
810 operation_up rhs = pstate->pop ();
811 operation_up lhs = pstate->pop ();
812 pstate->push_new<opencl_logical_binop_operation>
813 (BINOP_LOGICAL_OR, std::move (lhs),
814 std::move (rhs));
815 }
816 else
817 pstate->wrap2<logical_or_operation> ();
818 }
819 ;
820
821 exp : exp '?' exp ':' exp %prec '?'
822 {
823 operation_up last = pstate->pop ();
824 operation_up mid = pstate->pop ();
825 operation_up first = pstate->pop ();
826 if (pstate->language ()->la_language
827 == language_opencl)
828 pstate->push_new<opencl_ternop_cond_operation>
829 (std::move (first), std::move (mid),
830 std::move (last));
831 else
832 pstate->push_new<ternop_cond_operation>
833 (std::move (first), std::move (mid),
834 std::move (last));
835 }
836 ;
837
838 exp : exp '=' exp
839 {
840 if (pstate->language ()->la_language
841 == language_opencl)
842 pstate->wrap2<opencl_assign_operation> ();
843 else
844 pstate->wrap2<assign_operation> ();
845 }
846 ;
847
848 exp : exp ASSIGN_MODIFY exp
849 {
850 operation_up rhs = pstate->pop ();
851 operation_up lhs = pstate->pop ();
852 pstate->push_new<assign_modify_operation>
853 ($2, std::move (lhs), std::move (rhs));
854 }
855 ;
856
857 exp : INT
858 {
859 pstate->push_new<long_const_operation>
860 ($1.type, $1.val);
861 }
862 ;
863
864 exp : COMPLEX_INT
865 {
866 operation_up real
867 = (make_operation<long_const_operation>
868 ($1.type->target_type (), 0));
869 operation_up imag
870 = (make_operation<long_const_operation>
871 ($1.type->target_type (), $1.val));
872 pstate->push_new<complex_operation>
873 (std::move (real), std::move (imag), $1.type);
874 }
875 ;
876
877 exp : CHAR
878 {
879 struct stoken_vector vec;
880 vec.len = 1;
881 vec.tokens = &$1;
882 pstate->push_c_string ($1.type, &vec);
883 }
884 ;
885
886 exp : NAME_OR_INT
887 { YYSTYPE val;
888 parse_number (pstate, $1.stoken.ptr,
889 $1.stoken.length, 0, &val);
890 pstate->push_new<long_const_operation>
891 (val.typed_val_int.type,
892 val.typed_val_int.val);
893 }
894 ;
895
896
897 exp : FLOAT
898 {
899 float_data data;
900 std::copy (std::begin ($1.val), std::end ($1.val),
901 std::begin (data));
902 pstate->push_new<float_const_operation> ($1.type, data);
903 }
904 ;
905
906 exp : COMPLEX_FLOAT
907 {
908 struct type *underlying = $1.type->target_type ();
909
910 float_data val;
911 target_float_from_host_double (val.data (),
912 underlying, 0);
913 operation_up real
914 = (make_operation<float_const_operation>
915 (underlying, val));
916
917 std::copy (std::begin ($1.val), std::end ($1.val),
918 std::begin (val));
919 operation_up imag
920 = (make_operation<float_const_operation>
921 (underlying, val));
922
923 pstate->push_new<complex_operation>
924 (std::move (real), std::move (imag),
925 $1.type);
926 }
927 ;
928
929 exp : variable
930 ;
931
932 exp : DOLLAR_VARIABLE
933 {
934 pstate->push_dollar ($1);
935 }
936 ;
937
938 exp : SELECTOR '(' name ')'
939 {
940 pstate->push_new<objc_selector_operation>
941 (copy_name ($3));
942 }
943 ;
944
945 exp : SIZEOF '(' type ')' %prec UNARY
946 { struct type *type = $3;
947 struct type *int_type
948 = lookup_signed_typename (pstate->language (),
949 "int");
950 type = check_typedef (type);
951
952 /* $5.3.3/2 of the C++ Standard (n3290 draft)
953 says of sizeof: "When applied to a reference
954 or a reference type, the result is the size of
955 the referenced type." */
956 if (TYPE_IS_REFERENCE (type))
957 type = check_typedef (type->target_type ());
958
959 pstate->push_new<long_const_operation>
960 (int_type, type->length ());
961 }
962 ;
963
964 exp : REINTERPRET_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
965 { pstate->wrap2<reinterpret_cast_operation> (); }
966 ;
967
968 exp : STATIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
969 { pstate->wrap2<unop_cast_type_operation> (); }
970 ;
971
972 exp : DYNAMIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
973 { pstate->wrap2<dynamic_cast_operation> (); }
974 ;
975
976 exp : CONST_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
977 { /* We could do more error checking here, but
978 it doesn't seem worthwhile. */
979 pstate->wrap2<unop_cast_type_operation> (); }
980 ;
981
982 string_exp:
983 STRING
984 {
985 /* We copy the string here, and not in the
986 lexer, to guarantee that we do not leak a
987 string. Note that we follow the
988 NUL-termination convention of the
989 lexer. */
990 struct typed_stoken *vec = XNEW (struct typed_stoken);
991 $$.len = 1;
992 $$.tokens = vec;
993
994 vec->type = $1.type;
995 vec->length = $1.length;
996 vec->ptr = (char *) malloc ($1.length + 1);
997 memcpy (vec->ptr, $1.ptr, $1.length + 1);
998 }
999
1000 | string_exp STRING
1001 {
1002 /* Note that we NUL-terminate here, but just
1003 for convenience. */
1004 char *p;
1005 ++$$.len;
1006 $$.tokens = XRESIZEVEC (struct typed_stoken,
1007 $$.tokens, $$.len);
1008
1009 p = (char *) malloc ($2.length + 1);
1010 memcpy (p, $2.ptr, $2.length + 1);
1011
1012 $$.tokens[$$.len - 1].type = $2.type;
1013 $$.tokens[$$.len - 1].length = $2.length;
1014 $$.tokens[$$.len - 1].ptr = p;
1015 }
1016 ;
1017
1018 exp : string_exp
1019 {
1020 int i;
1021 c_string_type type = C_STRING;
1022
1023 for (i = 0; i < $1.len; ++i)
1024 {
1025 switch ($1.tokens[i].type)
1026 {
1027 case C_STRING:
1028 break;
1029 case C_WIDE_STRING:
1030 case C_STRING_16:
1031 case C_STRING_32:
1032 if (type != C_STRING
1033 && type != $1.tokens[i].type)
1034 error (_("Undefined string concatenation."));
1035 type = (enum c_string_type_values) $1.tokens[i].type;
1036 break;
1037 default:
1038 /* internal error */
1039 internal_error ("unrecognized type in string concatenation");
1040 }
1041 }
1042
1043 pstate->push_c_string (type, &$1);
1044 for (i = 0; i < $1.len; ++i)
1045 free ($1.tokens[i].ptr);
1046 free ($1.tokens);
1047 }
1048 ;
1049
1050 exp : NSSTRING /* ObjC NextStep NSString constant
1051 * of the form '@' '"' string '"'.
1052 */
1053 {
1054 pstate->push_new<objc_nsstring_operation>
1055 (copy_name ($1));
1056 }
1057 ;
1058
1059 /* C++. */
1060 exp : TRUEKEYWORD
1061 { pstate->push_new<long_const_operation>
1062 (parse_type (pstate)->builtin_bool, 1);
1063 }
1064 ;
1065
1066 exp : FALSEKEYWORD
1067 { pstate->push_new<long_const_operation>
1068 (parse_type (pstate)->builtin_bool, 0);
1069 }
1070 ;
1071
1072 /* end of C++. */
1073
1074 block : BLOCKNAME
1075 {
1076 if ($1.sym.symbol)
1077 $$ = $1.sym.symbol->value_block ();
1078 else
1079 error (_("No file or function \"%s\"."),
1080 copy_name ($1.stoken).c_str ());
1081 }
1082 | FILENAME
1083 {
1084 $$ = $1;
1085 }
1086 ;
1087
1088 block : block COLONCOLON name
1089 {
1090 std::string copy = copy_name ($3);
1091 struct symbol *tem
1092 = lookup_symbol (copy.c_str (), $1,
1093 VAR_DOMAIN, NULL).symbol;
1094
1095 if (!tem || tem->aclass () != LOC_BLOCK)
1096 error (_("No function \"%s\" in specified context."),
1097 copy.c_str ());
1098 $$ = tem->value_block (); }
1099 ;
1100
1101 variable: name_not_typename ENTRY
1102 { struct symbol *sym = $1.sym.symbol;
1103
1104 if (sym == NULL || !sym->is_argument ()
1105 || !symbol_read_needs_frame (sym))
1106 error (_("@entry can be used only for function "
1107 "parameters, not for \"%s\""),
1108 copy_name ($1.stoken).c_str ());
1109
1110 pstate->push_new<var_entry_value_operation> (sym);
1111 }
1112 ;
1113
1114 variable: block COLONCOLON name
1115 {
1116 std::string copy = copy_name ($3);
1117 struct block_symbol sym
1118 = lookup_symbol (copy.c_str (), $1,
1119 VAR_DOMAIN, NULL);
1120
1121 if (sym.symbol == 0)
1122 error (_("No symbol \"%s\" in specified context."),
1123 copy.c_str ());
1124 if (symbol_read_needs_frame (sym.symbol))
1125 pstate->block_tracker->update (sym);
1126
1127 pstate->push_new<var_value_operation> (sym);
1128 }
1129 ;
1130
1131 qualified_name: TYPENAME COLONCOLON name
1132 {
1133 struct type *type = $1.type;
1134 type = check_typedef (type);
1135 if (!type_aggregate_p (type))
1136 error (_("`%s' is not defined as an aggregate type."),
1137 TYPE_SAFE_NAME (type));
1138
1139 pstate->push_new<scope_operation> (type,
1140 copy_name ($3));
1141 }
1142 | TYPENAME COLONCOLON '~' name
1143 {
1144 struct type *type = $1.type;
1145
1146 type = check_typedef (type);
1147 if (!type_aggregate_p (type))
1148 error (_("`%s' is not defined as an aggregate type."),
1149 TYPE_SAFE_NAME (type));
1150 std::string name = "~" + std::string ($4.ptr,
1151 $4.length);
1152
1153 /* Check for valid destructor name. */
1154 destructor_name_p (name.c_str (), $1.type);
1155 pstate->push_new<scope_operation> (type,
1156 std::move (name));
1157 }
1158 | TYPENAME COLONCOLON name COLONCOLON name
1159 {
1160 std::string copy = copy_name ($3);
1161 error (_("No type \"%s\" within class "
1162 "or namespace \"%s\"."),
1163 copy.c_str (), TYPE_SAFE_NAME ($1.type));
1164 }
1165 ;
1166
1167 variable: qualified_name
1168 | COLONCOLON name_not_typename
1169 {
1170 std::string name = copy_name ($2.stoken);
1171 struct block_symbol sym
1172 = lookup_symbol (name.c_str (),
1173 (const struct block *) NULL,
1174 VAR_DOMAIN, NULL);
1175 pstate->push_symbol (name.c_str (), sym);
1176 }
1177 ;
1178
1179 variable: name_not_typename
1180 { struct block_symbol sym = $1.sym;
1181
1182 if (sym.symbol)
1183 {
1184 if (symbol_read_needs_frame (sym.symbol))
1185 pstate->block_tracker->update (sym);
1186
1187 /* If we found a function, see if it's
1188 an ifunc resolver that has the same
1189 address as the ifunc symbol itself.
1190 If so, prefer the ifunc symbol. */
1191
1192 bound_minimal_symbol resolver
1193 = find_gnu_ifunc (sym.symbol);
1194 if (resolver.minsym != NULL)
1195 pstate->push_new<var_msym_value_operation>
1196 (resolver);
1197 else
1198 pstate->push_new<var_value_operation> (sym);
1199 }
1200 else if ($1.is_a_field_of_this)
1201 {
1202 /* C++: it hangs off of `this'. Must
1203 not inadvertently convert from a method call
1204 to data ref. */
1205 pstate->block_tracker->update (sym);
1206 operation_up thisop
1207 = make_operation<op_this_operation> ();
1208 pstate->push_new<structop_ptr_operation>
1209 (std::move (thisop), copy_name ($1.stoken));
1210 }
1211 else
1212 {
1213 std::string arg = copy_name ($1.stoken);
1214
1215 bound_minimal_symbol msymbol
1216 = lookup_bound_minimal_symbol (arg.c_str ());
1217 if (msymbol.minsym == NULL)
1218 {
1219 if (!have_full_symbols () && !have_partial_symbols ())
1220 error (_("No symbol table is loaded. Use the \"file\" command."));
1221 else
1222 error (_("No symbol \"%s\" in current context."),
1223 arg.c_str ());
1224 }
1225
1226 /* This minsym might be an alias for
1227 another function. See if we can find
1228 the debug symbol for the target, and
1229 if so, use it instead, since it has
1230 return type / prototype info. This
1231 is important for example for "p
1232 *__errno_location()". */
1233 symbol *alias_target
1234 = ((msymbol.minsym->type () != mst_text_gnu_ifunc
1235 && msymbol.minsym->type () != mst_data_gnu_ifunc)
1236 ? find_function_alias_target (msymbol)
1237 : NULL);
1238 if (alias_target != NULL)
1239 {
1240 block_symbol bsym { alias_target,
1241 alias_target->value_block () };
1242 pstate->push_new<var_value_operation> (bsym);
1243 }
1244 else
1245 pstate->push_new<var_msym_value_operation>
1246 (msymbol);
1247 }
1248 }
1249 ;
1250
1251 const_or_volatile: const_or_volatile_noopt
1252 |
1253 ;
1254
1255 single_qualifier:
1256 CONST_KEYWORD
1257 { cpstate->type_stack.insert (tp_const); }
1258 | VOLATILE_KEYWORD
1259 { cpstate->type_stack.insert (tp_volatile); }
1260 | ATOMIC
1261 { cpstate->type_stack.insert (tp_atomic); }
1262 | RESTRICT
1263 { cpstate->type_stack.insert (tp_restrict); }
1264 | '@' NAME
1265 {
1266 cpstate->type_stack.insert (pstate,
1267 copy_name ($2.stoken).c_str ());
1268 }
1269 | '@' UNKNOWN_CPP_NAME
1270 {
1271 cpstate->type_stack.insert (pstate,
1272 copy_name ($2.stoken).c_str ());
1273 }
1274 ;
1275
1276 qualifier_seq_noopt:
1277 single_qualifier
1278 | qualifier_seq_noopt single_qualifier
1279 ;
1280
1281 qualifier_seq:
1282 qualifier_seq_noopt
1283 |
1284 ;
1285
1286 ptr_operator:
1287 ptr_operator '*'
1288 { cpstate->type_stack.insert (tp_pointer); }
1289 qualifier_seq
1290 | '*'
1291 { cpstate->type_stack.insert (tp_pointer); }
1292 qualifier_seq
1293 | '&'
1294 { cpstate->type_stack.insert (tp_reference); }
1295 | '&' ptr_operator
1296 { cpstate->type_stack.insert (tp_reference); }
1297 | ANDAND
1298 { cpstate->type_stack.insert (tp_rvalue_reference); }
1299 | ANDAND ptr_operator
1300 { cpstate->type_stack.insert (tp_rvalue_reference); }
1301 ;
1302
1303 ptr_operator_ts: ptr_operator
1304 {
1305 $$ = cpstate->type_stack.create ();
1306 cpstate->type_stacks.emplace_back ($$);
1307 }
1308 ;
1309
1310 abs_decl: ptr_operator_ts direct_abs_decl
1311 { $$ = $2->append ($1); }
1312 | ptr_operator_ts
1313 | direct_abs_decl
1314 ;
1315
1316 direct_abs_decl: '(' abs_decl ')'
1317 { $$ = $2; }
1318 | direct_abs_decl array_mod
1319 {
1320 cpstate->type_stack.push ($1);
1321 cpstate->type_stack.push ($2);
1322 cpstate->type_stack.push (tp_array);
1323 $$ = cpstate->type_stack.create ();
1324 cpstate->type_stacks.emplace_back ($$);
1325 }
1326 | array_mod
1327 {
1328 cpstate->type_stack.push ($1);
1329 cpstate->type_stack.push (tp_array);
1330 $$ = cpstate->type_stack.create ();
1331 cpstate->type_stacks.emplace_back ($$);
1332 }
1333
1334 | direct_abs_decl func_mod
1335 {
1336 cpstate->type_stack.push ($1);
1337 cpstate->type_stack.push ($2);
1338 $$ = cpstate->type_stack.create ();
1339 cpstate->type_stacks.emplace_back ($$);
1340 }
1341 | func_mod
1342 {
1343 cpstate->type_stack.push ($1);
1344 $$ = cpstate->type_stack.create ();
1345 cpstate->type_stacks.emplace_back ($$);
1346 }
1347 ;
1348
1349 array_mod: '[' ']'
1350 { $$ = -1; }
1351 | OBJC_LBRAC ']'
1352 { $$ = -1; }
1353 | '[' INT ']'
1354 { $$ = $2.val; }
1355 | OBJC_LBRAC INT ']'
1356 { $$ = $2.val; }
1357 ;
1358
1359 func_mod: '(' ')'
1360 {
1361 $$ = new std::vector<struct type *>;
1362 cpstate->type_lists.emplace_back ($$);
1363 }
1364 | '(' parameter_typelist ')'
1365 { $$ = $2; }
1366 ;
1367
1368 /* We used to try to recognize pointer to member types here, but
1369 that didn't work (shift/reduce conflicts meant that these rules never
1370 got executed). The problem is that
1371 int (foo::bar::baz::bizzle)
1372 is a function type but
1373 int (foo::bar::baz::bizzle::*)
1374 is a pointer to member type. Stroustrup loses again! */
1375
1376 type : ptype
1377 ;
1378
1379 /* A helper production that recognizes scalar types that can validly
1380 be used with _Complex. */
1381
1382 scalar_type:
1383 INT_KEYWORD
1384 { $$ = lookup_signed_typename (pstate->language (),
1385 "int"); }
1386 | LONG
1387 { $$ = lookup_signed_typename (pstate->language (),
1388 "long"); }
1389 | SHORT
1390 { $$ = lookup_signed_typename (pstate->language (),
1391 "short"); }
1392 | LONG INT_KEYWORD
1393 { $$ = lookup_signed_typename (pstate->language (),
1394 "long"); }
1395 | LONG SIGNED_KEYWORD INT_KEYWORD
1396 { $$ = lookup_signed_typename (pstate->language (),
1397 "long"); }
1398 | LONG SIGNED_KEYWORD
1399 { $$ = lookup_signed_typename (pstate->language (),
1400 "long"); }
1401 | SIGNED_KEYWORD LONG INT_KEYWORD
1402 { $$ = lookup_signed_typename (pstate->language (),
1403 "long"); }
1404 | UNSIGNED LONG INT_KEYWORD
1405 { $$ = lookup_unsigned_typename (pstate->language (),
1406 "long"); }
1407 | LONG UNSIGNED INT_KEYWORD
1408 { $$ = lookup_unsigned_typename (pstate->language (),
1409 "long"); }
1410 | LONG UNSIGNED
1411 { $$ = lookup_unsigned_typename (pstate->language (),
1412 "long"); }
1413 | LONG LONG
1414 { $$ = lookup_signed_typename (pstate->language (),
1415 "long long"); }
1416 | LONG LONG INT_KEYWORD
1417 { $$ = lookup_signed_typename (pstate->language (),
1418 "long long"); }
1419 | LONG LONG SIGNED_KEYWORD INT_KEYWORD
1420 { $$ = lookup_signed_typename (pstate->language (),
1421 "long long"); }
1422 | LONG LONG SIGNED_KEYWORD
1423 { $$ = lookup_signed_typename (pstate->language (),
1424 "long long"); }
1425 | SIGNED_KEYWORD LONG LONG
1426 { $$ = lookup_signed_typename (pstate->language (),
1427 "long long"); }
1428 | SIGNED_KEYWORD LONG LONG INT_KEYWORD
1429 { $$ = lookup_signed_typename (pstate->language (),
1430 "long long"); }
1431 | UNSIGNED LONG LONG
1432 { $$ = lookup_unsigned_typename (pstate->language (),
1433 "long long"); }
1434 | UNSIGNED LONG LONG INT_KEYWORD
1435 { $$ = lookup_unsigned_typename (pstate->language (),
1436 "long long"); }
1437 | LONG LONG UNSIGNED
1438 { $$ = lookup_unsigned_typename (pstate->language (),
1439 "long long"); }
1440 | LONG LONG UNSIGNED INT_KEYWORD
1441 { $$ = lookup_unsigned_typename (pstate->language (),
1442 "long long"); }
1443 | SHORT INT_KEYWORD
1444 { $$ = lookup_signed_typename (pstate->language (),
1445 "short"); }
1446 | SHORT SIGNED_KEYWORD INT_KEYWORD
1447 { $$ = lookup_signed_typename (pstate->language (),
1448 "short"); }
1449 | SHORT SIGNED_KEYWORD
1450 { $$ = lookup_signed_typename (pstate->language (),
1451 "short"); }
1452 | UNSIGNED SHORT INT_KEYWORD
1453 { $$ = lookup_unsigned_typename (pstate->language (),
1454 "short"); }
1455 | SHORT UNSIGNED
1456 { $$ = lookup_unsigned_typename (pstate->language (),
1457 "short"); }
1458 | SHORT UNSIGNED INT_KEYWORD
1459 { $$ = lookup_unsigned_typename (pstate->language (),
1460 "short"); }
1461 | DOUBLE_KEYWORD
1462 { $$ = lookup_typename (pstate->language (),
1463 "double",
1464 NULL,
1465 0); }
1466 | FLOAT_KEYWORD
1467 { $$ = lookup_typename (pstate->language (),
1468 "float",
1469 NULL,
1470 0); }
1471 | LONG DOUBLE_KEYWORD
1472 { $$ = lookup_typename (pstate->language (),
1473 "long double",
1474 NULL,
1475 0); }
1476 | UNSIGNED type_name
1477 { $$ = lookup_unsigned_typename (pstate->language (),
1478 $2.type->name ()); }
1479 | UNSIGNED
1480 { $$ = lookup_unsigned_typename (pstate->language (),
1481 "int"); }
1482 | SIGNED_KEYWORD type_name
1483 { $$ = lookup_signed_typename (pstate->language (),
1484 $2.type->name ()); }
1485 | SIGNED_KEYWORD
1486 { $$ = lookup_signed_typename (pstate->language (),
1487 "int"); }
1488 ;
1489
1490 /* Implements (approximately): (type-qualifier)* type-specifier.
1491
1492 When type-specifier is only ever a single word, like 'float' then these
1493 arrive as pre-built TYPENAME tokens thanks to the classify_name
1494 function. However, when a type-specifier can contain multiple words,
1495 for example 'double' can appear as just 'double' or 'long double', and
1496 similarly 'long' can appear as just 'long' or in 'long double', then
1497 these type-specifiers are parsed into their own tokens in the function
1498 lex_one_token and the ident_tokens array. These separate tokens are all
1499 recognised here. */
1500 typebase
1501 : TYPENAME
1502 { $$ = $1.type; }
1503 | scalar_type
1504 { $$ = $1; }
1505 | COMPLEX scalar_type
1506 {
1507 $$ = init_complex_type (nullptr, $2);
1508 }
1509 | STRUCT name
1510 { $$
1511 = lookup_struct (copy_name ($2).c_str (),
1512 pstate->expression_context_block);
1513 }
1514 | STRUCT COMPLETE
1515 {
1516 pstate->mark_completion_tag (TYPE_CODE_STRUCT,
1517 "", 0);
1518 $$ = NULL;
1519 }
1520 | STRUCT name COMPLETE
1521 {
1522 pstate->mark_completion_tag (TYPE_CODE_STRUCT,
1523 $2.ptr, $2.length);
1524 $$ = NULL;
1525 }
1526 | CLASS name
1527 { $$ = lookup_struct
1528 (copy_name ($2).c_str (),
1529 pstate->expression_context_block);
1530 }
1531 | CLASS COMPLETE
1532 {
1533 pstate->mark_completion_tag (TYPE_CODE_STRUCT,
1534 "", 0);
1535 $$ = NULL;
1536 }
1537 | CLASS name COMPLETE
1538 {
1539 pstate->mark_completion_tag (TYPE_CODE_STRUCT,
1540 $2.ptr, $2.length);
1541 $$ = NULL;
1542 }
1543 | UNION name
1544 { $$
1545 = lookup_union (copy_name ($2).c_str (),
1546 pstate->expression_context_block);
1547 }
1548 | UNION COMPLETE
1549 {
1550 pstate->mark_completion_tag (TYPE_CODE_UNION,
1551 "", 0);
1552 $$ = NULL;
1553 }
1554 | UNION name COMPLETE
1555 {
1556 pstate->mark_completion_tag (TYPE_CODE_UNION,
1557 $2.ptr, $2.length);
1558 $$ = NULL;
1559 }
1560 | ENUM name
1561 { $$ = lookup_enum (copy_name ($2).c_str (),
1562 pstate->expression_context_block);
1563 }
1564 | ENUM COMPLETE
1565 {
1566 pstate->mark_completion_tag (TYPE_CODE_ENUM, "", 0);
1567 $$ = NULL;
1568 }
1569 | ENUM name COMPLETE
1570 {
1571 pstate->mark_completion_tag (TYPE_CODE_ENUM, $2.ptr,
1572 $2.length);
1573 $$ = NULL;
1574 }
1575 /* It appears that this rule for templates is never
1576 reduced; template recognition happens by lookahead
1577 in the token processing code in yylex. */
1578 | TEMPLATE name '<' type '>'
1579 { $$ = lookup_template_type
1580 (copy_name($2).c_str (), $4,
1581 pstate->expression_context_block);
1582 }
1583 | qualifier_seq_noopt typebase
1584 { $$ = cpstate->type_stack.follow_types ($2); }
1585 | typebase qualifier_seq_noopt
1586 { $$ = cpstate->type_stack.follow_types ($1); }
1587 ;
1588
1589 type_name: TYPENAME
1590 | INT_KEYWORD
1591 {
1592 $$.stoken.ptr = "int";
1593 $$.stoken.length = 3;
1594 $$.type = lookup_signed_typename (pstate->language (),
1595 "int");
1596 }
1597 | LONG
1598 {
1599 $$.stoken.ptr = "long";
1600 $$.stoken.length = 4;
1601 $$.type = lookup_signed_typename (pstate->language (),
1602 "long");
1603 }
1604 | SHORT
1605 {
1606 $$.stoken.ptr = "short";
1607 $$.stoken.length = 5;
1608 $$.type = lookup_signed_typename (pstate->language (),
1609 "short");
1610 }
1611 ;
1612
1613 parameter_typelist:
1614 nonempty_typelist
1615 { check_parameter_typelist ($1); }
1616 | nonempty_typelist ',' DOTDOTDOT
1617 {
1618 $1->push_back (NULL);
1619 check_parameter_typelist ($1);
1620 $$ = $1;
1621 }
1622 ;
1623
1624 nonempty_typelist
1625 : type
1626 {
1627 std::vector<struct type *> *typelist
1628 = new std::vector<struct type *>;
1629 cpstate->type_lists.emplace_back (typelist);
1630
1631 typelist->push_back ($1);
1632 $$ = typelist;
1633 }
1634 | nonempty_typelist ',' type
1635 {
1636 $1->push_back ($3);
1637 $$ = $1;
1638 }
1639 ;
1640
1641 ptype : typebase
1642 | ptype abs_decl
1643 {
1644 cpstate->type_stack.push ($2);
1645 $$ = cpstate->type_stack.follow_types ($1);
1646 }
1647 ;
1648
1649 conversion_type_id: typebase conversion_declarator
1650 { $$ = cpstate->type_stack.follow_types ($1); }
1651 ;
1652
1653 conversion_declarator: /* Nothing. */
1654 | ptr_operator conversion_declarator
1655 ;
1656
1657 const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
1658 | VOLATILE_KEYWORD CONST_KEYWORD
1659 ;
1660
1661 const_or_volatile_noopt: const_and_volatile
1662 { cpstate->type_stack.insert (tp_const);
1663 cpstate->type_stack.insert (tp_volatile);
1664 }
1665 | CONST_KEYWORD
1666 { cpstate->type_stack.insert (tp_const); }
1667 | VOLATILE_KEYWORD
1668 { cpstate->type_stack.insert (tp_volatile); }
1669 ;
1670
1671 oper: OPERATOR NEW
1672 { $$ = operator_stoken (" new"); }
1673 | OPERATOR DELETE
1674 { $$ = operator_stoken (" delete"); }
1675 | OPERATOR NEW '[' ']'
1676 { $$ = operator_stoken (" new[]"); }
1677 | OPERATOR DELETE '[' ']'
1678 { $$ = operator_stoken (" delete[]"); }
1679 | OPERATOR NEW OBJC_LBRAC ']'
1680 { $$ = operator_stoken (" new[]"); }
1681 | OPERATOR DELETE OBJC_LBRAC ']'
1682 { $$ = operator_stoken (" delete[]"); }
1683 | OPERATOR '+'
1684 { $$ = operator_stoken ("+"); }
1685 | OPERATOR '-'
1686 { $$ = operator_stoken ("-"); }
1687 | OPERATOR '*'
1688 { $$ = operator_stoken ("*"); }
1689 | OPERATOR '/'
1690 { $$ = operator_stoken ("/"); }
1691 | OPERATOR '%'
1692 { $$ = operator_stoken ("%"); }
1693 | OPERATOR '^'
1694 { $$ = operator_stoken ("^"); }
1695 | OPERATOR '&'
1696 { $$ = operator_stoken ("&"); }
1697 | OPERATOR '|'
1698 { $$ = operator_stoken ("|"); }
1699 | OPERATOR '~'
1700 { $$ = operator_stoken ("~"); }
1701 | OPERATOR '!'
1702 { $$ = operator_stoken ("!"); }
1703 | OPERATOR '='
1704 { $$ = operator_stoken ("="); }
1705 | OPERATOR '<'
1706 { $$ = operator_stoken ("<"); }
1707 | OPERATOR '>'
1708 { $$ = operator_stoken (">"); }
1709 | OPERATOR ASSIGN_MODIFY
1710 { const char *op = " unknown";
1711 switch ($2)
1712 {
1713 case BINOP_RSH:
1714 op = ">>=";
1715 break;
1716 case BINOP_LSH:
1717 op = "<<=";
1718 break;
1719 case BINOP_ADD:
1720 op = "+=";
1721 break;
1722 case BINOP_SUB:
1723 op = "-=";
1724 break;
1725 case BINOP_MUL:
1726 op = "*=";
1727 break;
1728 case BINOP_DIV:
1729 op = "/=";
1730 break;
1731 case BINOP_REM:
1732 op = "%=";
1733 break;
1734 case BINOP_BITWISE_IOR:
1735 op = "|=";
1736 break;
1737 case BINOP_BITWISE_AND:
1738 op = "&=";
1739 break;
1740 case BINOP_BITWISE_XOR:
1741 op = "^=";
1742 break;
1743 default:
1744 break;
1745 }
1746
1747 $$ = operator_stoken (op);
1748 }
1749 | OPERATOR LSH
1750 { $$ = operator_stoken ("<<"); }
1751 | OPERATOR RSH
1752 { $$ = operator_stoken (">>"); }
1753 | OPERATOR EQUAL
1754 { $$ = operator_stoken ("=="); }
1755 | OPERATOR NOTEQUAL
1756 { $$ = operator_stoken ("!="); }
1757 | OPERATOR LEQ
1758 { $$ = operator_stoken ("<="); }
1759 | OPERATOR GEQ
1760 { $$ = operator_stoken (">="); }
1761 | OPERATOR ANDAND
1762 { $$ = operator_stoken ("&&"); }
1763 | OPERATOR OROR
1764 { $$ = operator_stoken ("||"); }
1765 | OPERATOR INCREMENT
1766 { $$ = operator_stoken ("++"); }
1767 | OPERATOR DECREMENT
1768 { $$ = operator_stoken ("--"); }
1769 | OPERATOR ','
1770 { $$ = operator_stoken (","); }
1771 | OPERATOR ARROW_STAR
1772 { $$ = operator_stoken ("->*"); }
1773 | OPERATOR ARROW
1774 { $$ = operator_stoken ("->"); }
1775 | OPERATOR '(' ')'
1776 { $$ = operator_stoken ("()"); }
1777 | OPERATOR '[' ']'
1778 { $$ = operator_stoken ("[]"); }
1779 | OPERATOR OBJC_LBRAC ']'
1780 { $$ = operator_stoken ("[]"); }
1781 | OPERATOR conversion_type_id
1782 {
1783 string_file buf;
1784 c_print_type ($2, NULL, &buf, -1, 0,
1785 pstate->language ()->la_language,
1786 &type_print_raw_options);
1787 std::string name = buf.release ();
1788
1789 /* This also needs canonicalization. */
1790 gdb::unique_xmalloc_ptr<char> canon
1791 = cp_canonicalize_string (name.c_str ());
1792 if (canon != nullptr)
1793 name = canon.get ();
1794 $$ = operator_stoken ((" " + name).c_str ());
1795 }
1796 ;
1797
1798 /* This rule exists in order to allow some tokens that would not normally
1799 match the 'name' rule to appear as fields within a struct. The example
1800 that initially motivated this was the RISC-V target which models the
1801 floating point registers as a union with fields called 'float' and
1802 'double'. */
1803 field_name
1804 : name
1805 | DOUBLE_KEYWORD { $$ = typename_stoken ("double"); }
1806 | FLOAT_KEYWORD { $$ = typename_stoken ("float"); }
1807 | INT_KEYWORD { $$ = typename_stoken ("int"); }
1808 | LONG { $$ = typename_stoken ("long"); }
1809 | SHORT { $$ = typename_stoken ("short"); }
1810 | SIGNED_KEYWORD { $$ = typename_stoken ("signed"); }
1811 | UNSIGNED { $$ = typename_stoken ("unsigned"); }
1812 ;
1813
1814 name : NAME { $$ = $1.stoken; }
1815 | BLOCKNAME { $$ = $1.stoken; }
1816 | TYPENAME { $$ = $1.stoken; }
1817 | NAME_OR_INT { $$ = $1.stoken; }
1818 | UNKNOWN_CPP_NAME { $$ = $1.stoken; }
1819 | oper { $$ = $1; }
1820 ;
1821
1822 name_not_typename : NAME
1823 | BLOCKNAME
1824 /* These would be useful if name_not_typename was useful, but it is just
1825 a fake for "variable", so these cause reduce/reduce conflicts because
1826 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
1827 =exp) or just an exp. If name_not_typename was ever used in an lvalue
1828 context where only a name could occur, this might be useful.
1829 | NAME_OR_INT
1830 */
1831 | oper
1832 {
1833 struct field_of_this_result is_a_field_of_this;
1834
1835 $$.stoken = $1;
1836 $$.sym
1837 = lookup_symbol ($1.ptr,
1838 pstate->expression_context_block,
1839 VAR_DOMAIN,
1840 &is_a_field_of_this);
1841 $$.is_a_field_of_this
1842 = is_a_field_of_this.type != NULL;
1843 }
1844 | UNKNOWN_CPP_NAME
1845 ;
1846
1847 %%
1848
1849 /* Returns a stoken of the operator name given by OP (which does not
1850 include the string "operator"). */
1851
1852 static struct stoken
1853 operator_stoken (const char *op)
1854 {
1855 struct stoken st = { NULL, 0 };
1856 char *buf;
1857
1858 st.length = CP_OPERATOR_LEN + strlen (op);
1859 buf = (char *) malloc (st.length + 1);
1860 strcpy (buf, CP_OPERATOR_STR);
1861 strcat (buf, op);
1862 st.ptr = buf;
1863
1864 /* The toplevel (c_parse) will free the memory allocated here. */
1865 cpstate->strings.emplace_back (buf);
1866 return st;
1867 };
1868
1869 /* Returns a stoken of the type named TYPE. */
1870
1871 static struct stoken
1872 typename_stoken (const char *type)
1873 {
1874 struct stoken st = { type, 0 };
1875 st.length = strlen (type);
1876 return st;
1877 };
1878
1879 /* Return true if the type is aggregate-like. */
1880
1881 static int
1882 type_aggregate_p (struct type *type)
1883 {
1884 return (type->code () == TYPE_CODE_STRUCT
1885 || type->code () == TYPE_CODE_UNION
1886 || type->code () == TYPE_CODE_NAMESPACE
1887 || (type->code () == TYPE_CODE_ENUM
1888 && type->is_declared_class ()));
1889 }
1890
1891 /* Validate a parameter typelist. */
1892
1893 static void
1894 check_parameter_typelist (std::vector<struct type *> *params)
1895 {
1896 struct type *type;
1897 int ix;
1898
1899 for (ix = 0; ix < params->size (); ++ix)
1900 {
1901 type = (*params)[ix];
1902 if (type != NULL && check_typedef (type)->code () == TYPE_CODE_VOID)
1903 {
1904 if (ix == 0)
1905 {
1906 if (params->size () == 1)
1907 {
1908 /* Ok. */
1909 break;
1910 }
1911 error (_("parameter types following 'void'"));
1912 }
1913 else
1914 error (_("'void' invalid as parameter type"));
1915 }
1916 }
1917 }
1918
1919 /* Take care of parsing a number (anything that starts with a digit).
1920 Set yylval and return the token type; update lexptr.
1921 LEN is the number of characters in it. */
1922
1923 /*** Needs some error checking for the float case ***/
1924
1925 static int
1926 parse_number (struct parser_state *par_state,
1927 const char *buf, int len, int parsed_float, YYSTYPE *putithere)
1928 {
1929 ULONGEST n = 0;
1930 ULONGEST prevn = 0;
1931
1932 int i = 0;
1933 int c;
1934 int base = input_radix;
1935 int unsigned_p = 0;
1936
1937 /* Number of "L" suffixes encountered. */
1938 int long_p = 0;
1939
1940 /* Imaginary number. */
1941 bool imaginary_p = false;
1942
1943 /* We have found a "L" or "U" (or "i") suffix. */
1944 int found_suffix = 0;
1945
1946 char *p;
1947
1948 p = (char *) alloca (len);
1949 memcpy (p, buf, len);
1950
1951 if (parsed_float)
1952 {
1953 if (len >= 1 && p[len - 1] == 'i')
1954 {
1955 imaginary_p = true;
1956 --len;
1957 }
1958
1959 /* Handle suffixes for decimal floating-point: "df", "dd" or "dl". */
1960 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
1961 {
1962 putithere->typed_val_float.type
1963 = parse_type (par_state)->builtin_decfloat;
1964 len -= 2;
1965 }
1966 else if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
1967 {
1968 putithere->typed_val_float.type
1969 = parse_type (par_state)->builtin_decdouble;
1970 len -= 2;
1971 }
1972 else if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
1973 {
1974 putithere->typed_val_float.type
1975 = parse_type (par_state)->builtin_declong;
1976 len -= 2;
1977 }
1978 /* Handle suffixes: 'f' for float, 'l' for long double. */
1979 else if (len >= 1 && TOLOWER (p[len - 1]) == 'f')
1980 {
1981 putithere->typed_val_float.type
1982 = parse_type (par_state)->builtin_float;
1983 len -= 1;
1984 }
1985 else if (len >= 1 && TOLOWER (p[len - 1]) == 'l')
1986 {
1987 putithere->typed_val_float.type
1988 = parse_type (par_state)->builtin_long_double;
1989 len -= 1;
1990 }
1991 /* Default type for floating-point literals is double. */
1992 else
1993 {
1994 putithere->typed_val_float.type
1995 = parse_type (par_state)->builtin_double;
1996 }
1997
1998 if (!parse_float (p, len,
1999 putithere->typed_val_float.type,
2000 putithere->typed_val_float.val))
2001 return ERROR;
2002
2003 if (imaginary_p)
2004 putithere->typed_val_float.type
2005 = init_complex_type (nullptr, putithere->typed_val_float.type);
2006
2007 return imaginary_p ? COMPLEX_FLOAT : FLOAT;
2008 }
2009
2010 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
2011 if (p[0] == '0' && len > 1)
2012 switch (p[1])
2013 {
2014 case 'x':
2015 case 'X':
2016 if (len >= 3)
2017 {
2018 p += 2;
2019 base = 16;
2020 len -= 2;
2021 }
2022 break;
2023
2024 case 'b':
2025 case 'B':
2026 if (len >= 3)
2027 {
2028 p += 2;
2029 base = 2;
2030 len -= 2;
2031 }
2032 break;
2033
2034 case 't':
2035 case 'T':
2036 case 'd':
2037 case 'D':
2038 if (len >= 3)
2039 {
2040 p += 2;
2041 base = 10;
2042 len -= 2;
2043 }
2044 break;
2045
2046 default:
2047 base = 8;
2048 break;
2049 }
2050
2051 while (len-- > 0)
2052 {
2053 c = *p++;
2054 if (c >= 'A' && c <= 'Z')
2055 c += 'a' - 'A';
2056 if (c != 'l' && c != 'u' && c != 'i')
2057 n *= base;
2058 if (c >= '0' && c <= '9')
2059 {
2060 if (found_suffix)
2061 return ERROR;
2062 n += i = c - '0';
2063 }
2064 else
2065 {
2066 if (base > 10 && c >= 'a' && c <= 'f')
2067 {
2068 if (found_suffix)
2069 return ERROR;
2070 n += i = c - 'a' + 10;
2071 }
2072 else if (c == 'l')
2073 {
2074 ++long_p;
2075 found_suffix = 1;
2076 }
2077 else if (c == 'u')
2078 {
2079 unsigned_p = 1;
2080 found_suffix = 1;
2081 }
2082 else if (c == 'i')
2083 {
2084 imaginary_p = true;
2085 found_suffix = 1;
2086 }
2087 else
2088 return ERROR; /* Char not a digit */
2089 }
2090 if (i >= base)
2091 return ERROR; /* Invalid digit in this base */
2092
2093 if (c != 'l' && c != 'u' && c != 'i')
2094 {
2095 /* Test for overflow. */
2096 if (prevn == 0 && n == 0)
2097 ;
2098 else if (prevn >= n)
2099 error (_("Numeric constant too large."));
2100 }
2101 prevn = n;
2102 }
2103
2104 /* An integer constant is an int, a long, or a long long. An L
2105 suffix forces it to be long; an LL suffix forces it to be long
2106 long. If not forced to a larger size, it gets the first type of
2107 the above that it fits in. To figure out whether it fits, we
2108 shift it right and see whether anything remains. Note that we
2109 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
2110 operation, because many compilers will warn about such a shift
2111 (which always produces a zero result). Sometimes gdbarch_int_bit
2112 or gdbarch_long_bit will be that big, sometimes not. To deal with
2113 the case where it is we just always shift the value more than
2114 once, with fewer bits each time. */
2115 int int_bits = gdbarch_int_bit (par_state->gdbarch ());
2116 int long_bits = gdbarch_long_bit (par_state->gdbarch ());
2117 int long_long_bits = gdbarch_long_long_bit (par_state->gdbarch ());
2118 bool have_signed
2119 /* No 'u' suffix. */
2120 = !unsigned_p;
2121 bool have_unsigned
2122 = ((/* 'u' suffix. */
2123 unsigned_p)
2124 || (/* Not a decimal. */
2125 base != 10)
2126 || (/* Allowed as a convenience, in case decimal doesn't fit in largest
2127 signed type. */
2128 !fits_in_type (1, n, long_long_bits, true)));
2129 bool have_int
2130 /* No 'l' or 'll' suffix. */
2131 = long_p == 0;
2132 bool have_long
2133 /* No 'll' suffix. */
2134 = long_p <= 1;
2135 if (have_int && have_signed && fits_in_type (1, n, int_bits, true))
2136 putithere->typed_val_int.type = parse_type (par_state)->builtin_int;
2137 else if (have_int && have_unsigned && fits_in_type (1, n, int_bits, false))
2138 putithere->typed_val_int.type
2139 = parse_type (par_state)->builtin_unsigned_int;
2140 else if (have_long && have_signed && fits_in_type (1, n, long_bits, true))
2141 putithere->typed_val_int.type = parse_type (par_state)->builtin_long;
2142 else if (have_long && have_unsigned && fits_in_type (1, n, long_bits, false))
2143 putithere->typed_val_int.type
2144 = parse_type (par_state)->builtin_unsigned_long;
2145 else if (have_signed && fits_in_type (1, n, long_long_bits, true))
2146 putithere->typed_val_int.type
2147 = parse_type (par_state)->builtin_long_long;
2148 else if (have_unsigned && fits_in_type (1, n, long_long_bits, false))
2149 putithere->typed_val_int.type
2150 = parse_type (par_state)->builtin_unsigned_long_long;
2151 else
2152 error (_("Numeric constant too large."));
2153 putithere->typed_val_int.val = n;
2154
2155 if (imaginary_p)
2156 putithere->typed_val_int.type
2157 = init_complex_type (nullptr, putithere->typed_val_int.type);
2158
2159 return imaginary_p ? COMPLEX_INT : INT;
2160 }
2161
2162 /* Temporary obstack used for holding strings. */
2163 static struct obstack tempbuf;
2164 static int tempbuf_init;
2165
2166 /* Parse a C escape sequence. The initial backslash of the sequence
2167 is at (*PTR)[-1]. *PTR will be updated to point to just after the
2168 last character of the sequence. If OUTPUT is not NULL, the
2169 translated form of the escape sequence will be written there. If
2170 OUTPUT is NULL, no output is written and the call will only affect
2171 *PTR. If an escape sequence is expressed in target bytes, then the
2172 entire sequence will simply be copied to OUTPUT. Return 1 if any
2173 character was emitted, 0 otherwise. */
2174
2175 int
2176 c_parse_escape (const char **ptr, struct obstack *output)
2177 {
2178 const char *tokptr = *ptr;
2179 int result = 1;
2180
2181 /* Some escape sequences undergo character set conversion. Those we
2182 translate here. */
2183 switch (*tokptr)
2184 {
2185 /* Hex escapes do not undergo character set conversion, so keep
2186 the escape sequence for later. */
2187 case 'x':
2188 if (output)
2189 obstack_grow_str (output, "\\x");
2190 ++tokptr;
2191 if (!ISXDIGIT (*tokptr))
2192 error (_("\\x escape without a following hex digit"));
2193 while (ISXDIGIT (*tokptr))
2194 {
2195 if (output)
2196 obstack_1grow (output, *tokptr);
2197 ++tokptr;
2198 }
2199 break;
2200
2201 /* Octal escapes do not undergo character set conversion, so
2202 keep the escape sequence for later. */
2203 case '0':
2204 case '1':
2205 case '2':
2206 case '3':
2207 case '4':
2208 case '5':
2209 case '6':
2210 case '7':
2211 {
2212 int i;
2213 if (output)
2214 obstack_grow_str (output, "\\");
2215 for (i = 0;
2216 i < 3 && ISDIGIT (*tokptr) && *tokptr != '8' && *tokptr != '9';
2217 ++i)
2218 {
2219 if (output)
2220 obstack_1grow (output, *tokptr);
2221 ++tokptr;
2222 }
2223 }
2224 break;
2225
2226 /* We handle UCNs later. We could handle them here, but that
2227 would mean a spurious error in the case where the UCN could
2228 be converted to the target charset but not the host
2229 charset. */
2230 case 'u':
2231 case 'U':
2232 {
2233 char c = *tokptr;
2234 int i, len = c == 'U' ? 8 : 4;
2235 if (output)
2236 {
2237 obstack_1grow (output, '\\');
2238 obstack_1grow (output, *tokptr);
2239 }
2240 ++tokptr;
2241 if (!ISXDIGIT (*tokptr))
2242 error (_("\\%c escape without a following hex digit"), c);
2243 for (i = 0; i < len && ISXDIGIT (*tokptr); ++i)
2244 {
2245 if (output)
2246 obstack_1grow (output, *tokptr);
2247 ++tokptr;
2248 }
2249 }
2250 break;
2251
2252 /* We must pass backslash through so that it does not
2253 cause quoting during the second expansion. */
2254 case '\\':
2255 if (output)
2256 obstack_grow_str (output, "\\\\");
2257 ++tokptr;
2258 break;
2259
2260 /* Escapes which undergo conversion. */
2261 case 'a':
2262 if (output)
2263 obstack_1grow (output, '\a');
2264 ++tokptr;
2265 break;
2266 case 'b':
2267 if (output)
2268 obstack_1grow (output, '\b');
2269 ++tokptr;
2270 break;
2271 case 'f':
2272 if (output)
2273 obstack_1grow (output, '\f');
2274 ++tokptr;
2275 break;
2276 case 'n':
2277 if (output)
2278 obstack_1grow (output, '\n');
2279 ++tokptr;
2280 break;
2281 case 'r':
2282 if (output)
2283 obstack_1grow (output, '\r');
2284 ++tokptr;
2285 break;
2286 case 't':
2287 if (output)
2288 obstack_1grow (output, '\t');
2289 ++tokptr;
2290 break;
2291 case 'v':
2292 if (output)
2293 obstack_1grow (output, '\v');
2294 ++tokptr;
2295 break;
2296
2297 /* GCC extension. */
2298 case 'e':
2299 if (output)
2300 obstack_1grow (output, HOST_ESCAPE_CHAR);
2301 ++tokptr;
2302 break;
2303
2304 /* Backslash-newline expands to nothing at all. */
2305 case '\n':
2306 ++tokptr;
2307 result = 0;
2308 break;
2309
2310 /* A few escapes just expand to the character itself. */
2311 case '\'':
2312 case '\"':
2313 case '?':
2314 /* GCC extensions. */
2315 case '(':
2316 case '{':
2317 case '[':
2318 case '%':
2319 /* Unrecognized escapes turn into the character itself. */
2320 default:
2321 if (output)
2322 obstack_1grow (output, *tokptr);
2323 ++tokptr;
2324 break;
2325 }
2326 *ptr = tokptr;
2327 return result;
2328 }
2329
2330 /* Parse a string or character literal from TOKPTR. The string or
2331 character may be wide or unicode. *OUTPTR is set to just after the
2332 end of the literal in the input string. The resulting token is
2333 stored in VALUE. This returns a token value, either STRING or
2334 CHAR, depending on what was parsed. *HOST_CHARS is set to the
2335 number of host characters in the literal. */
2336
2337 static int
2338 parse_string_or_char (const char *tokptr, const char **outptr,
2339 struct typed_stoken *value, int *host_chars)
2340 {
2341 int quote;
2342 c_string_type type;
2343 int is_objc = 0;
2344
2345 /* Build the gdb internal form of the input string in tempbuf. Note
2346 that the buffer is null byte terminated *only* for the
2347 convenience of debugging gdb itself and printing the buffer
2348 contents when the buffer contains no embedded nulls. Gdb does
2349 not depend upon the buffer being null byte terminated, it uses
2350 the length string instead. This allows gdb to handle C strings
2351 (as well as strings in other languages) with embedded null
2352 bytes */
2353
2354 if (!tempbuf_init)
2355 tempbuf_init = 1;
2356 else
2357 obstack_free (&tempbuf, NULL);
2358 obstack_init (&tempbuf);
2359
2360 /* Record the string type. */
2361 if (*tokptr == 'L')
2362 {
2363 type = C_WIDE_STRING;
2364 ++tokptr;
2365 }
2366 else if (*tokptr == 'u')
2367 {
2368 type = C_STRING_16;
2369 ++tokptr;
2370 }
2371 else if (*tokptr == 'U')
2372 {
2373 type = C_STRING_32;
2374 ++tokptr;
2375 }
2376 else if (*tokptr == '@')
2377 {
2378 /* An Objective C string. */
2379 is_objc = 1;
2380 type = C_STRING;
2381 ++tokptr;
2382 }
2383 else
2384 type = C_STRING;
2385
2386 /* Skip the quote. */
2387 quote = *tokptr;
2388 if (quote == '\'')
2389 type |= C_CHAR;
2390 ++tokptr;
2391
2392 *host_chars = 0;
2393
2394 while (*tokptr)
2395 {
2396 char c = *tokptr;
2397 if (c == '\\')
2398 {
2399 ++tokptr;
2400 *host_chars += c_parse_escape (&tokptr, &tempbuf);
2401 }
2402 else if (c == quote)
2403 break;
2404 else
2405 {
2406 obstack_1grow (&tempbuf, c);
2407 ++tokptr;
2408 /* FIXME: this does the wrong thing with multi-byte host
2409 characters. We could use mbrlen here, but that would
2410 make "set host-charset" a bit less useful. */
2411 ++*host_chars;
2412 }
2413 }
2414
2415 if (*tokptr != quote)
2416 {
2417 if (quote == '"')
2418 error (_("Unterminated string in expression."));
2419 else
2420 error (_("Unmatched single quote."));
2421 }
2422 ++tokptr;
2423
2424 value->type = type;
2425 value->ptr = (char *) obstack_base (&tempbuf);
2426 value->length = obstack_object_size (&tempbuf);
2427
2428 *outptr = tokptr;
2429
2430 return quote == '"' ? (is_objc ? NSSTRING : STRING) : CHAR;
2431 }
2432
2433 /* This is used to associate some attributes with a token. */
2434
2435 enum token_flag
2436 {
2437 /* If this bit is set, the token is C++-only. */
2438
2439 FLAG_CXX = 1,
2440
2441 /* If this bit is set, the token is C-only. */
2442
2443 FLAG_C = 2,
2444
2445 /* If this bit is set, the token is conditional: if there is a
2446 symbol of the same name, then the token is a symbol; otherwise,
2447 the token is a keyword. */
2448
2449 FLAG_SHADOW = 4
2450 };
2451 DEF_ENUM_FLAGS_TYPE (enum token_flag, token_flags);
2452
2453 struct token
2454 {
2455 const char *oper;
2456 int token;
2457 enum exp_opcode opcode;
2458 token_flags flags;
2459 };
2460
2461 static const struct token tokentab3[] =
2462 {
2463 {">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
2464 {"<<=", ASSIGN_MODIFY, BINOP_LSH, 0},
2465 {"->*", ARROW_STAR, OP_NULL, FLAG_CXX},
2466 {"...", DOTDOTDOT, OP_NULL, 0}
2467 };
2468
2469 static const struct token tokentab2[] =
2470 {
2471 {"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
2472 {"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
2473 {"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
2474 {"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
2475 {"%=", ASSIGN_MODIFY, BINOP_REM, 0},
2476 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
2477 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
2478 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
2479 {"++", INCREMENT, OP_NULL, 0},
2480 {"--", DECREMENT, OP_NULL, 0},
2481 {"->", ARROW, OP_NULL, 0},
2482 {"&&", ANDAND, OP_NULL, 0},
2483 {"||", OROR, OP_NULL, 0},
2484 /* "::" is *not* only C++: gdb overrides its meaning in several
2485 different ways, e.g., 'filename'::func, function::variable. */
2486 {"::", COLONCOLON, OP_NULL, 0},
2487 {"<<", LSH, OP_NULL, 0},
2488 {">>", RSH, OP_NULL, 0},
2489 {"==", EQUAL, OP_NULL, 0},
2490 {"!=", NOTEQUAL, OP_NULL, 0},
2491 {"<=", LEQ, OP_NULL, 0},
2492 {">=", GEQ, OP_NULL, 0},
2493 {".*", DOT_STAR, OP_NULL, FLAG_CXX}
2494 };
2495
2496 /* Identifier-like tokens. Only type-specifiers than can appear in
2497 multi-word type names (for example 'double' can appear in 'long
2498 double') need to be listed here. type-specifiers that are only ever
2499 single word (like 'char') are handled by the classify_name function. */
2500 static const struct token ident_tokens[] =
2501 {
2502 {"unsigned", UNSIGNED, OP_NULL, 0},
2503 {"template", TEMPLATE, OP_NULL, FLAG_CXX},
2504 {"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
2505 {"struct", STRUCT, OP_NULL, 0},
2506 {"signed", SIGNED_KEYWORD, OP_NULL, 0},
2507 {"sizeof", SIZEOF, OP_NULL, 0},
2508 {"_Alignof", ALIGNOF, OP_NULL, 0},
2509 {"alignof", ALIGNOF, OP_NULL, FLAG_CXX},
2510 {"double", DOUBLE_KEYWORD, OP_NULL, 0},
2511 {"float", FLOAT_KEYWORD, OP_NULL, 0},
2512 {"false", FALSEKEYWORD, OP_NULL, FLAG_CXX},
2513 {"class", CLASS, OP_NULL, FLAG_CXX},
2514 {"union", UNION, OP_NULL, 0},
2515 {"short", SHORT, OP_NULL, 0},
2516 {"const", CONST_KEYWORD, OP_NULL, 0},
2517 {"restrict", RESTRICT, OP_NULL, FLAG_C | FLAG_SHADOW},
2518 {"__restrict__", RESTRICT, OP_NULL, 0},
2519 {"__restrict", RESTRICT, OP_NULL, 0},
2520 {"_Atomic", ATOMIC, OP_NULL, 0},
2521 {"enum", ENUM, OP_NULL, 0},
2522 {"long", LONG, OP_NULL, 0},
2523 {"_Complex", COMPLEX, OP_NULL, 0},
2524 {"__complex__", COMPLEX, OP_NULL, 0},
2525
2526 {"true", TRUEKEYWORD, OP_NULL, FLAG_CXX},
2527 {"int", INT_KEYWORD, OP_NULL, 0},
2528 {"new", NEW, OP_NULL, FLAG_CXX},
2529 {"delete", DELETE, OP_NULL, FLAG_CXX},
2530 {"operator", OPERATOR, OP_NULL, FLAG_CXX},
2531
2532 {"and", ANDAND, OP_NULL, FLAG_CXX},
2533 {"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, FLAG_CXX},
2534 {"bitand", '&', OP_NULL, FLAG_CXX},
2535 {"bitor", '|', OP_NULL, FLAG_CXX},
2536 {"compl", '~', OP_NULL, FLAG_CXX},
2537 {"not", '!', OP_NULL, FLAG_CXX},
2538 {"not_eq", NOTEQUAL, OP_NULL, FLAG_CXX},
2539 {"or", OROR, OP_NULL, FLAG_CXX},
2540 {"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, FLAG_CXX},
2541 {"xor", '^', OP_NULL, FLAG_CXX},
2542 {"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, FLAG_CXX},
2543
2544 {"const_cast", CONST_CAST, OP_NULL, FLAG_CXX },
2545 {"dynamic_cast", DYNAMIC_CAST, OP_NULL, FLAG_CXX },
2546 {"static_cast", STATIC_CAST, OP_NULL, FLAG_CXX },
2547 {"reinterpret_cast", REINTERPRET_CAST, OP_NULL, FLAG_CXX },
2548
2549 {"__typeof__", TYPEOF, OP_TYPEOF, 0 },
2550 {"__typeof", TYPEOF, OP_TYPEOF, 0 },
2551 {"typeof", TYPEOF, OP_TYPEOF, FLAG_SHADOW },
2552 {"__decltype", DECLTYPE, OP_DECLTYPE, FLAG_CXX },
2553 {"decltype", DECLTYPE, OP_DECLTYPE, FLAG_CXX | FLAG_SHADOW },
2554
2555 {"typeid", TYPEID, OP_TYPEID, FLAG_CXX}
2556 };
2557
2558
2559 static void
2560 scan_macro_expansion (const char *expansion)
2561 {
2562 /* We'd better not be trying to push the stack twice. */
2563 gdb_assert (! cpstate->macro_original_text);
2564
2565 /* Copy to the obstack. */
2566 const char *copy = obstack_strdup (&cpstate->expansion_obstack, expansion);
2567
2568 /* Save the old lexptr value, so we can return to it when we're done
2569 parsing the expanded text. */
2570 cpstate->macro_original_text = pstate->lexptr;
2571 pstate->lexptr = copy;
2572 }
2573
2574 static int
2575 scanning_macro_expansion (void)
2576 {
2577 return cpstate->macro_original_text != 0;
2578 }
2579
2580 static void
2581 finished_macro_expansion (void)
2582 {
2583 /* There'd better be something to pop back to. */
2584 gdb_assert (cpstate->macro_original_text);
2585
2586 /* Pop back to the original text. */
2587 pstate->lexptr = cpstate->macro_original_text;
2588 cpstate->macro_original_text = 0;
2589 }
2590
2591 /* Return true iff the token represents a C++ cast operator. */
2592
2593 static int
2594 is_cast_operator (const char *token, int len)
2595 {
2596 return (! strncmp (token, "dynamic_cast", len)
2597 || ! strncmp (token, "static_cast", len)
2598 || ! strncmp (token, "reinterpret_cast", len)
2599 || ! strncmp (token, "const_cast", len));
2600 }
2601
2602 /* The scope used for macro expansion. */
2603 static struct macro_scope *expression_macro_scope;
2604
2605 /* This is set if a NAME token appeared at the very end of the input
2606 string, with no whitespace separating the name from the EOF. This
2607 is used only when parsing to do field name completion. */
2608 static int saw_name_at_eof;
2609
2610 /* This is set if the previously-returned token was a structure
2611 operator -- either '.' or ARROW. */
2612 static bool last_was_structop;
2613
2614 /* Depth of parentheses. */
2615 static int paren_depth;
2616
2617 /* Read one token, getting characters through lexptr. */
2618
2619 static int
2620 lex_one_token (struct parser_state *par_state, bool *is_quoted_name)
2621 {
2622 int c;
2623 int namelen;
2624 const char *tokstart;
2625 bool saw_structop = last_was_structop;
2626
2627 last_was_structop = false;
2628 *is_quoted_name = false;
2629
2630 retry:
2631
2632 /* Check if this is a macro invocation that we need to expand. */
2633 if (! scanning_macro_expansion ())
2634 {
2635 gdb::unique_xmalloc_ptr<char> expanded
2636 = macro_expand_next (&pstate->lexptr, *expression_macro_scope);
2637
2638 if (expanded != nullptr)
2639 scan_macro_expansion (expanded.get ());
2640 }
2641
2642 pstate->prev_lexptr = pstate->lexptr;
2643
2644 tokstart = pstate->lexptr;
2645 /* See if it is a special token of length 3. */
2646 for (const auto &token : tokentab3)
2647 if (strncmp (tokstart, token.oper, 3) == 0)
2648 {
2649 if ((token.flags & FLAG_CXX) != 0
2650 && par_state->language ()->la_language != language_cplus)
2651 break;
2652 gdb_assert ((token.flags & FLAG_C) == 0);
2653
2654 pstate->lexptr += 3;
2655 yylval.opcode = token.opcode;
2656 return token.token;
2657 }
2658
2659 /* See if it is a special token of length 2. */
2660 for (const auto &token : tokentab2)
2661 if (strncmp (tokstart, token.oper, 2) == 0)
2662 {
2663 if ((token.flags & FLAG_CXX) != 0
2664 && par_state->language ()->la_language != language_cplus)
2665 break;
2666 gdb_assert ((token.flags & FLAG_C) == 0);
2667
2668 pstate->lexptr += 2;
2669 yylval.opcode = token.opcode;
2670 if (token.token == ARROW)
2671 last_was_structop = 1;
2672 return token.token;
2673 }
2674
2675 switch (c = *tokstart)
2676 {
2677 case 0:
2678 /* If we were just scanning the result of a macro expansion,
2679 then we need to resume scanning the original text.
2680 If we're parsing for field name completion, and the previous
2681 token allows such completion, return a COMPLETE token.
2682 Otherwise, we were already scanning the original text, and
2683 we're really done. */
2684 if (scanning_macro_expansion ())
2685 {
2686 finished_macro_expansion ();
2687 goto retry;
2688 }
2689 else if (saw_name_at_eof)
2690 {
2691 saw_name_at_eof = 0;
2692 return COMPLETE;
2693 }
2694 else if (par_state->parse_completion && saw_structop)
2695 return COMPLETE;
2696 else
2697 return 0;
2698
2699 case ' ':
2700 case '\t':
2701 case '\n':
2702 pstate->lexptr++;
2703 goto retry;
2704
2705 case '[':
2706 case '(':
2707 paren_depth++;
2708 pstate->lexptr++;
2709 if (par_state->language ()->la_language == language_objc
2710 && c == '[')
2711 return OBJC_LBRAC;
2712 return c;
2713
2714 case ']':
2715 case ')':
2716 if (paren_depth == 0)
2717 return 0;
2718 paren_depth--;
2719 pstate->lexptr++;
2720 return c;
2721
2722 case ',':
2723 if (pstate->comma_terminates
2724 && paren_depth == 0
2725 && ! scanning_macro_expansion ())
2726 return 0;
2727 pstate->lexptr++;
2728 return c;
2729
2730 case '.':
2731 /* Might be a floating point number. */
2732 if (pstate->lexptr[1] < '0' || pstate->lexptr[1] > '9')
2733 {
2734 last_was_structop = true;
2735 goto symbol; /* Nope, must be a symbol. */
2736 }
2737 /* FALL THRU. */
2738
2739 case '0':
2740 case '1':
2741 case '2':
2742 case '3':
2743 case '4':
2744 case '5':
2745 case '6':
2746 case '7':
2747 case '8':
2748 case '9':
2749 {
2750 /* It's a number. */
2751 int got_dot = 0, got_e = 0, got_p = 0, toktype;
2752 const char *p = tokstart;
2753 int hex = input_radix > 10;
2754
2755 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
2756 {
2757 p += 2;
2758 hex = 1;
2759 }
2760 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
2761 {
2762 p += 2;
2763 hex = 0;
2764 }
2765
2766 for (;; ++p)
2767 {
2768 /* This test includes !hex because 'e' is a valid hex digit
2769 and thus does not indicate a floating point number when
2770 the radix is hex. */
2771 if (!hex && !got_e && !got_p && (*p == 'e' || *p == 'E'))
2772 got_dot = got_e = 1;
2773 else if (!got_e && !got_p && (*p == 'p' || *p == 'P'))
2774 got_dot = got_p = 1;
2775 /* This test does not include !hex, because a '.' always indicates
2776 a decimal floating point number regardless of the radix. */
2777 else if (!got_dot && *p == '.')
2778 got_dot = 1;
2779 else if (((got_e && (p[-1] == 'e' || p[-1] == 'E'))
2780 || (got_p && (p[-1] == 'p' || p[-1] == 'P')))
2781 && (*p == '-' || *p == '+'))
2782 /* This is the sign of the exponent, not the end of the
2783 number. */
2784 continue;
2785 /* We will take any letters or digits. parse_number will
2786 complain if past the radix, or if L or U are not final. */
2787 else if ((*p < '0' || *p > '9')
2788 && ((*p < 'a' || *p > 'z')
2789 && (*p < 'A' || *p > 'Z')))
2790 break;
2791 }
2792 toktype = parse_number (par_state, tokstart, p - tokstart,
2793 got_dot | got_e | got_p, &yylval);
2794 if (toktype == ERROR)
2795 {
2796 char *err_copy = (char *) alloca (p - tokstart + 1);
2797
2798 memcpy (err_copy, tokstart, p - tokstart);
2799 err_copy[p - tokstart] = 0;
2800 error (_("Invalid number \"%s\"."), err_copy);
2801 }
2802 pstate->lexptr = p;
2803 return toktype;
2804 }
2805
2806 case '@':
2807 {
2808 const char *p = &tokstart[1];
2809
2810 if (par_state->language ()->la_language == language_objc)
2811 {
2812 size_t len = strlen ("selector");
2813
2814 if (strncmp (p, "selector", len) == 0
2815 && (p[len] == '\0' || ISSPACE (p[len])))
2816 {
2817 pstate->lexptr = p + len;
2818 return SELECTOR;
2819 }
2820 else if (*p == '"')
2821 goto parse_string;
2822 }
2823
2824 while (ISSPACE (*p))
2825 p++;
2826 size_t len = strlen ("entry");
2827 if (strncmp (p, "entry", len) == 0 && !c_ident_is_alnum (p[len])
2828 && p[len] != '_')
2829 {
2830 pstate->lexptr = &p[len];
2831 return ENTRY;
2832 }
2833 }
2834 /* FALLTHRU */
2835 case '+':
2836 case '-':
2837 case '*':
2838 case '/':
2839 case '%':
2840 case '|':
2841 case '&':
2842 case '^':
2843 case '~':
2844 case '!':
2845 case '<':
2846 case '>':
2847 case '?':
2848 case ':':
2849 case '=':
2850 case '{':
2851 case '}':
2852 symbol:
2853 pstate->lexptr++;
2854 return c;
2855
2856 case 'L':
2857 case 'u':
2858 case 'U':
2859 if (tokstart[1] != '"' && tokstart[1] != '\'')
2860 break;
2861 /* Fall through. */
2862 case '\'':
2863 case '"':
2864
2865 parse_string:
2866 {
2867 int host_len;
2868 int result = parse_string_or_char (tokstart, &pstate->lexptr,
2869 &yylval.tsval, &host_len);
2870 if (result == CHAR)
2871 {
2872 if (host_len == 0)
2873 error (_("Empty character constant."));
2874 else if (host_len > 2 && c == '\'')
2875 {
2876 ++tokstart;
2877 namelen = pstate->lexptr - tokstart - 1;
2878 *is_quoted_name = true;
2879
2880 goto tryname;
2881 }
2882 else if (host_len > 1)
2883 error (_("Invalid character constant."));
2884 }
2885 return result;
2886 }
2887 }
2888
2889 if (!(c == '_' || c == '$' || c_ident_is_alpha (c)))
2890 /* We must have come across a bad character (e.g. ';'). */
2891 error (_("Invalid character '%c' in expression."), c);
2892
2893 /* It's a name. See how long it is. */
2894 namelen = 0;
2895 for (c = tokstart[namelen];
2896 (c == '_' || c == '$' || c_ident_is_alnum (c) || c == '<');)
2897 {
2898 /* Template parameter lists are part of the name.
2899 FIXME: This mishandles `print $a<4&&$a>3'. */
2900
2901 if (c == '<')
2902 {
2903 if (! is_cast_operator (tokstart, namelen))
2904 {
2905 /* Scan ahead to get rest of the template specification. Note
2906 that we look ahead only when the '<' adjoins non-whitespace
2907 characters; for comparison expressions, e.g. "a < b > c",
2908 there must be spaces before the '<', etc. */
2909 const char *p = find_template_name_end (tokstart + namelen);
2910
2911 if (p)
2912 namelen = p - tokstart;
2913 }
2914 break;
2915 }
2916 c = tokstart[++namelen];
2917 }
2918
2919 /* The token "if" terminates the expression and is NOT removed from
2920 the input stream. It doesn't count if it appears in the
2921 expansion of a macro. */
2922 if (namelen == 2
2923 && tokstart[0] == 'i'
2924 && tokstart[1] == 'f'
2925 && ! scanning_macro_expansion ())
2926 {
2927 return 0;
2928 }
2929
2930 /* For the same reason (breakpoint conditions), "thread N"
2931 terminates the expression. "thread" could be an identifier, but
2932 an identifier is never followed by a number without intervening
2933 punctuation. "task" is similar. Handle abbreviations of these,
2934 similarly to breakpoint.c:find_condition_and_thread. */
2935 if (namelen >= 1
2936 && (strncmp (tokstart, "thread", namelen) == 0
2937 || strncmp (tokstart, "task", namelen) == 0)
2938 && (tokstart[namelen] == ' ' || tokstart[namelen] == '\t')
2939 && ! scanning_macro_expansion ())
2940 {
2941 const char *p = tokstart + namelen + 1;
2942
2943 while (*p == ' ' || *p == '\t')
2944 p++;
2945 if (*p >= '0' && *p <= '9')
2946 return 0;
2947 }
2948
2949 pstate->lexptr += namelen;
2950
2951 tryname:
2952
2953 yylval.sval.ptr = tokstart;
2954 yylval.sval.length = namelen;
2955
2956 /* Catch specific keywords. */
2957 std::string copy = copy_name (yylval.sval);
2958 for (const auto &token : ident_tokens)
2959 if (copy == token.oper)
2960 {
2961 if ((token.flags & FLAG_CXX) != 0
2962 && par_state->language ()->la_language != language_cplus)
2963 break;
2964 if ((token.flags & FLAG_C) != 0
2965 && par_state->language ()->la_language != language_c
2966 && par_state->language ()->la_language != language_objc)
2967 break;
2968
2969 if ((token.flags & FLAG_SHADOW) != 0)
2970 {
2971 struct field_of_this_result is_a_field_of_this;
2972
2973 if (lookup_symbol (copy.c_str (),
2974 pstate->expression_context_block,
2975 VAR_DOMAIN,
2976 (par_state->language ()->la_language
2977 == language_cplus ? &is_a_field_of_this
2978 : NULL)).symbol
2979 != NULL)
2980 {
2981 /* The keyword is shadowed. */
2982 break;
2983 }
2984 }
2985
2986 /* It is ok to always set this, even though we don't always
2987 strictly need to. */
2988 yylval.opcode = token.opcode;
2989 return token.token;
2990 }
2991
2992 if (*tokstart == '$')
2993 return DOLLAR_VARIABLE;
2994
2995 if (pstate->parse_completion && *pstate->lexptr == '\0')
2996 saw_name_at_eof = 1;
2997
2998 yylval.ssym.stoken = yylval.sval;
2999 yylval.ssym.sym.symbol = NULL;
3000 yylval.ssym.sym.block = NULL;
3001 yylval.ssym.is_a_field_of_this = 0;
3002 return NAME;
3003 }
3004
3005 /* An object of this type is pushed on a FIFO by the "outer" lexer. */
3006 struct token_and_value
3007 {
3008 int token;
3009 YYSTYPE value;
3010 };
3011
3012 /* A FIFO of tokens that have been read but not yet returned to the
3013 parser. */
3014 static std::vector<token_and_value> token_fifo;
3015
3016 /* Non-zero if the lexer should return tokens from the FIFO. */
3017 static int popping;
3018
3019 /* Temporary storage for c_lex; this holds symbol names as they are
3020 built up. */
3021 static auto_obstack name_obstack;
3022
3023 /* Classify a NAME token. The contents of the token are in `yylval'.
3024 Updates yylval and returns the new token type. BLOCK is the block
3025 in which lookups start; this can be NULL to mean the global scope.
3026 IS_QUOTED_NAME is non-zero if the name token was originally quoted
3027 in single quotes. IS_AFTER_STRUCTOP is true if this name follows
3028 a structure operator -- either '.' or ARROW */
3029
3030 static int
3031 classify_name (struct parser_state *par_state, const struct block *block,
3032 bool is_quoted_name, bool is_after_structop)
3033 {
3034 struct block_symbol bsym;
3035 struct field_of_this_result is_a_field_of_this;
3036
3037 std::string copy = copy_name (yylval.sval);
3038
3039 /* Initialize this in case we *don't* use it in this call; that way
3040 we can refer to it unconditionally below. */
3041 memset (&is_a_field_of_this, 0, sizeof (is_a_field_of_this));
3042
3043 bsym = lookup_symbol (copy.c_str (), block, VAR_DOMAIN,
3044 par_state->language ()->name_of_this ()
3045 ? &is_a_field_of_this : NULL);
3046
3047 if (bsym.symbol && bsym.symbol->aclass () == LOC_BLOCK)
3048 {
3049 yylval.ssym.sym = bsym;
3050 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
3051 return BLOCKNAME;
3052 }
3053 else if (!bsym.symbol)
3054 {
3055 /* If we found a field of 'this', we might have erroneously
3056 found a constructor where we wanted a type name. Handle this
3057 case by noticing that we found a constructor and then look up
3058 the type tag instead. */
3059 if (is_a_field_of_this.type != NULL
3060 && is_a_field_of_this.fn_field != NULL
3061 && TYPE_FN_FIELD_CONSTRUCTOR (is_a_field_of_this.fn_field->fn_fields,
3062 0))
3063 {
3064 struct field_of_this_result inner_is_a_field_of_this;
3065
3066 bsym = lookup_symbol (copy.c_str (), block, STRUCT_DOMAIN,
3067 &inner_is_a_field_of_this);
3068 if (bsym.symbol != NULL)
3069 {
3070 yylval.tsym.type = bsym.symbol->type ();
3071 return TYPENAME;
3072 }
3073 }
3074
3075 /* If we found a field on the "this" object, or we are looking
3076 up a field on a struct, then we want to prefer it over a
3077 filename. However, if the name was quoted, then it is better
3078 to check for a filename or a block, since this is the only
3079 way the user has of requiring the extension to be used. */
3080 if ((is_a_field_of_this.type == NULL && !is_after_structop)
3081 || is_quoted_name)
3082 {
3083 /* See if it's a file name. */
3084 struct symtab *symtab;
3085
3086 symtab = lookup_symtab (copy.c_str ());
3087 if (symtab)
3088 {
3089 yylval.bval
3090 = symtab->compunit ()->blockvector ()->static_block ();
3091
3092 return FILENAME;
3093 }
3094 }
3095 }
3096
3097 if (bsym.symbol && bsym.symbol->aclass () == LOC_TYPEDEF)
3098 {
3099 yylval.tsym.type = bsym.symbol->type ();
3100 return TYPENAME;
3101 }
3102
3103 /* See if it's an ObjC classname. */
3104 if (par_state->language ()->la_language == language_objc && !bsym.symbol)
3105 {
3106 CORE_ADDR Class = lookup_objc_class (par_state->gdbarch (),
3107 copy.c_str ());
3108 if (Class)
3109 {
3110 struct symbol *sym;
3111
3112 yylval.theclass.theclass = Class;
3113 sym = lookup_struct_typedef (copy.c_str (),
3114 par_state->expression_context_block, 1);
3115 if (sym)
3116 yylval.theclass.type = sym->type ();
3117 return CLASSNAME;
3118 }
3119 }
3120
3121 /* Input names that aren't symbols but ARE valid hex numbers, when
3122 the input radix permits them, can be names or numbers depending
3123 on the parse. Note we support radixes > 16 here. */
3124 if (!bsym.symbol
3125 && ((copy[0] >= 'a' && copy[0] < 'a' + input_radix - 10)
3126 || (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10)))
3127 {
3128 YYSTYPE newlval; /* Its value is ignored. */
3129 int hextype = parse_number (par_state, copy.c_str (), yylval.sval.length,
3130 0, &newlval);
3131
3132 if (hextype == INT)
3133 {
3134 yylval.ssym.sym = bsym;
3135 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
3136 return NAME_OR_INT;
3137 }
3138 }
3139
3140 /* Any other kind of symbol */
3141 yylval.ssym.sym = bsym;
3142 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
3143
3144 if (bsym.symbol == NULL
3145 && par_state->language ()->la_language == language_cplus
3146 && is_a_field_of_this.type == NULL
3147 && lookup_minimal_symbol (copy.c_str (), NULL, NULL).minsym == NULL)
3148 return UNKNOWN_CPP_NAME;
3149
3150 return NAME;
3151 }
3152
3153 /* Like classify_name, but used by the inner loop of the lexer, when a
3154 name might have already been seen. CONTEXT is the context type, or
3155 NULL if this is the first component of a name. */
3156
3157 static int
3158 classify_inner_name (struct parser_state *par_state,
3159 const struct block *block, struct type *context)
3160 {
3161 struct type *type;
3162
3163 if (context == NULL)
3164 return classify_name (par_state, block, false, false);
3165
3166 type = check_typedef (context);
3167 if (!type_aggregate_p (type))
3168 return ERROR;
3169
3170 std::string copy = copy_name (yylval.ssym.stoken);
3171 /* N.B. We assume the symbol can only be in VAR_DOMAIN. */
3172 yylval.ssym.sym = cp_lookup_nested_symbol (type, copy.c_str (), block,
3173 VAR_DOMAIN);
3174
3175 /* If no symbol was found, search for a matching base class named
3176 COPY. This will allow users to enter qualified names of class members
3177 relative to the `this' pointer. */
3178 if (yylval.ssym.sym.symbol == NULL)
3179 {
3180 struct type *base_type = cp_find_type_baseclass_by_name (type,
3181 copy.c_str ());
3182
3183 if (base_type != NULL)
3184 {
3185 yylval.tsym.type = base_type;
3186 return TYPENAME;
3187 }
3188
3189 return ERROR;
3190 }
3191
3192 switch (yylval.ssym.sym.symbol->aclass ())
3193 {
3194 case LOC_BLOCK:
3195 case LOC_LABEL:
3196 /* cp_lookup_nested_symbol might have accidentally found a constructor
3197 named COPY when we really wanted a base class of the same name.
3198 Double-check this case by looking for a base class. */
3199 {
3200 struct type *base_type
3201 = cp_find_type_baseclass_by_name (type, copy.c_str ());
3202
3203 if (base_type != NULL)
3204 {
3205 yylval.tsym.type = base_type;
3206 return TYPENAME;
3207 }
3208 }
3209 return ERROR;
3210
3211 case LOC_TYPEDEF:
3212 yylval.tsym.type = yylval.ssym.sym.symbol->type ();
3213 return TYPENAME;
3214
3215 default:
3216 return NAME;
3217 }
3218 internal_error (_("not reached"));
3219 }
3220
3221 /* The outer level of a two-level lexer. This calls the inner lexer
3222 to return tokens. It then either returns these tokens, or
3223 aggregates them into a larger token. This lets us work around a
3224 problem in our parsing approach, where the parser could not
3225 distinguish between qualified names and qualified types at the
3226 right point.
3227
3228 This approach is still not ideal, because it mishandles template
3229 types. See the comment in lex_one_token for an example. However,
3230 this is still an improvement over the earlier approach, and will
3231 suffice until we move to better parsing technology. */
3232
3233 static int
3234 yylex (void)
3235 {
3236 token_and_value current;
3237 int first_was_coloncolon, last_was_coloncolon;
3238 struct type *context_type = NULL;
3239 int last_to_examine, next_to_examine, checkpoint;
3240 const struct block *search_block;
3241 bool is_quoted_name, last_lex_was_structop;
3242
3243 if (popping && !token_fifo.empty ())
3244 goto do_pop;
3245 popping = 0;
3246
3247 last_lex_was_structop = last_was_structop;
3248
3249 /* Read the first token and decide what to do. Most of the
3250 subsequent code is C++-only; but also depends on seeing a "::" or
3251 name-like token. */
3252 current.token = lex_one_token (pstate, &is_quoted_name);
3253 if (current.token == NAME)
3254 current.token = classify_name (pstate, pstate->expression_context_block,
3255 is_quoted_name, last_lex_was_structop);
3256 if (pstate->language ()->la_language != language_cplus
3257 || (current.token != TYPENAME && current.token != COLONCOLON
3258 && current.token != FILENAME))
3259 return current.token;
3260
3261 /* Read any sequence of alternating "::" and name-like tokens into
3262 the token FIFO. */
3263 current.value = yylval;
3264 token_fifo.push_back (current);
3265 last_was_coloncolon = current.token == COLONCOLON;
3266 while (1)
3267 {
3268 bool ignore;
3269
3270 /* We ignore quoted names other than the very first one.
3271 Subsequent ones do not have any special meaning. */
3272 current.token = lex_one_token (pstate, &ignore);
3273 current.value = yylval;
3274 token_fifo.push_back (current);
3275
3276 if ((last_was_coloncolon && current.token != NAME)
3277 || (!last_was_coloncolon && current.token != COLONCOLON))
3278 break;
3279 last_was_coloncolon = !last_was_coloncolon;
3280 }
3281 popping = 1;
3282
3283 /* We always read one extra token, so compute the number of tokens
3284 to examine accordingly. */
3285 last_to_examine = token_fifo.size () - 2;
3286 next_to_examine = 0;
3287
3288 current = token_fifo[next_to_examine];
3289 ++next_to_examine;
3290
3291 name_obstack.clear ();
3292 checkpoint = 0;
3293 if (current.token == FILENAME)
3294 search_block = current.value.bval;
3295 else if (current.token == COLONCOLON)
3296 search_block = NULL;
3297 else
3298 {
3299 gdb_assert (current.token == TYPENAME);
3300 search_block = pstate->expression_context_block;
3301 obstack_grow (&name_obstack, current.value.sval.ptr,
3302 current.value.sval.length);
3303 context_type = current.value.tsym.type;
3304 checkpoint = 1;
3305 }
3306
3307 first_was_coloncolon = current.token == COLONCOLON;
3308 last_was_coloncolon = first_was_coloncolon;
3309
3310 while (next_to_examine <= last_to_examine)
3311 {
3312 token_and_value next;
3313
3314 next = token_fifo[next_to_examine];
3315 ++next_to_examine;
3316
3317 if (next.token == NAME && last_was_coloncolon)
3318 {
3319 int classification;
3320
3321 yylval = next.value;
3322 classification = classify_inner_name (pstate, search_block,
3323 context_type);
3324 /* We keep going until we either run out of names, or until
3325 we have a qualified name which is not a type. */
3326 if (classification != TYPENAME && classification != NAME)
3327 break;
3328
3329 /* Accept up to this token. */
3330 checkpoint = next_to_examine;
3331
3332 /* Update the partial name we are constructing. */
3333 if (context_type != NULL)
3334 {
3335 /* We don't want to put a leading "::" into the name. */
3336 obstack_grow_str (&name_obstack, "::");
3337 }
3338 obstack_grow (&name_obstack, next.value.sval.ptr,
3339 next.value.sval.length);
3340
3341 yylval.sval.ptr = (const char *) obstack_base (&name_obstack);
3342 yylval.sval.length = obstack_object_size (&name_obstack);
3343 current.value = yylval;
3344 current.token = classification;
3345
3346 last_was_coloncolon = 0;
3347
3348 if (classification == NAME)
3349 break;
3350
3351 context_type = yylval.tsym.type;
3352 }
3353 else if (next.token == COLONCOLON && !last_was_coloncolon)
3354 last_was_coloncolon = 1;
3355 else
3356 {
3357 /* We've reached the end of the name. */
3358 break;
3359 }
3360 }
3361
3362 /* If we have a replacement token, install it as the first token in
3363 the FIFO, and delete the other constituent tokens. */
3364 if (checkpoint > 0)
3365 {
3366 current.value.sval.ptr
3367 = obstack_strndup (&cpstate->expansion_obstack,
3368 current.value.sval.ptr,
3369 current.value.sval.length);
3370
3371 token_fifo[0] = current;
3372 if (checkpoint > 1)
3373 token_fifo.erase (token_fifo.begin () + 1,
3374 token_fifo.begin () + checkpoint);
3375 }
3376
3377 do_pop:
3378 current = token_fifo[0];
3379 token_fifo.erase (token_fifo.begin ());
3380 yylval = current.value;
3381 return current.token;
3382 }
3383
3384 int
3385 c_parse (struct parser_state *par_state)
3386 {
3387 /* Setting up the parser state. */
3388 scoped_restore pstate_restore = make_scoped_restore (&pstate);
3389 gdb_assert (par_state != NULL);
3390 pstate = par_state;
3391
3392 c_parse_state cstate;
3393 scoped_restore cstate_restore = make_scoped_restore (&cpstate, &cstate);
3394
3395 gdb::unique_xmalloc_ptr<struct macro_scope> macro_scope;
3396
3397 if (par_state->expression_context_block)
3398 macro_scope
3399 = sal_macro_scope (find_pc_line (par_state->expression_context_pc, 0));
3400 else
3401 macro_scope = default_macro_scope ();
3402 if (! macro_scope)
3403 macro_scope = user_macro_scope ();
3404
3405 scoped_restore restore_macro_scope
3406 = make_scoped_restore (&expression_macro_scope, macro_scope.get ());
3407
3408 scoped_restore restore_yydebug = make_scoped_restore (&yydebug,
3409 parser_debug);
3410
3411 /* Initialize some state used by the lexer. */
3412 last_was_structop = false;
3413 saw_name_at_eof = 0;
3414 paren_depth = 0;
3415
3416 token_fifo.clear ();
3417 popping = 0;
3418 name_obstack.clear ();
3419
3420 int result = yyparse ();
3421 if (!result)
3422 pstate->set_operation (pstate->pop ());
3423 return result;
3424 }
3425
3426 #if defined(YYBISON) && YYBISON < 30800
3427
3428
3429 /* This is called via the YYPRINT macro when parser debugging is
3430 enabled. It prints a token's value. */
3431
3432 static void
3433 c_print_token (FILE *file, int type, YYSTYPE value)
3434 {
3435 switch (type)
3436 {
3437 case INT:
3438 parser_fprintf (file, "typed_val_int<%s, %s>",
3439 TYPE_SAFE_NAME (value.typed_val_int.type),
3440 pulongest (value.typed_val_int.val));
3441 break;
3442
3443 case CHAR:
3444 case STRING:
3445 {
3446 char *copy = (char *) alloca (value.tsval.length + 1);
3447
3448 memcpy (copy, value.tsval.ptr, value.tsval.length);
3449 copy[value.tsval.length] = '\0';
3450
3451 parser_fprintf (file, "tsval<type=%d, %s>", value.tsval.type, copy);
3452 }
3453 break;
3454
3455 case NSSTRING:
3456 case DOLLAR_VARIABLE:
3457 parser_fprintf (file, "sval<%s>", copy_name (value.sval).c_str ());
3458 break;
3459
3460 case TYPENAME:
3461 parser_fprintf (file, "tsym<type=%s, name=%s>",
3462 TYPE_SAFE_NAME (value.tsym.type),
3463 copy_name (value.tsym.stoken).c_str ());
3464 break;
3465
3466 case NAME:
3467 case UNKNOWN_CPP_NAME:
3468 case NAME_OR_INT:
3469 case BLOCKNAME:
3470 parser_fprintf (file, "ssym<name=%s, sym=%s, field_of_this=%d>",
3471 copy_name (value.ssym.stoken).c_str (),
3472 (value.ssym.sym.symbol == NULL
3473 ? "(null)" : value.ssym.sym.symbol->print_name ()),
3474 value.ssym.is_a_field_of_this);
3475 break;
3476
3477 case FILENAME:
3478 parser_fprintf (file, "bval<%s>", host_address_to_string (value.bval));
3479 break;
3480 }
3481 }
3482
3483 #endif
3484
3485 static void
3486 yyerror (const char *msg)
3487 {
3488 if (pstate->prev_lexptr)
3489 pstate->lexptr = pstate->prev_lexptr;
3490
3491 error (_("A %s in expression, near `%s'."), msg, pstate->lexptr);
3492 }
The GNU Binutils are a collection of binary tools.