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1/* YACC parser for C expressions, for GDB.
2 Copyright (C) 1986-2020 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
59#define parse_type(ps) builtin_type (ps->gdbarch ())
60
61/* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
62 etc). */
63#define GDB_YY_REMAP_PREFIX c_
64#include "yy-remap.h"
65
66/* The state of the parser, used internally when we are parsing the
67 expression. */
68
69static struct parser_state *pstate = NULL;
70
71/* Data that must be held for the duration of a parse. */
72
73struct c_parse_state
74{
75 /* These are used to hold type lists and type stacks that are
76 allocated during the parse. */
77 std::vector<std::unique_ptr<std::vector<struct type *>>> type_lists;
78 std::vector<std::unique_ptr<struct type_stack>> type_stacks;
79
80 /* Storage for some strings allocated during the parse. */
81 std::vector<gdb::unique_xmalloc_ptr<char>> strings;
82
83 /* When we find that lexptr (the global var defined in parse.c) is
84 pointing at a macro invocation, we expand the invocation, and call
85 scan_macro_expansion to save the old lexptr here and point lexptr
86 into the expanded text. When we reach the end of that, we call
87 end_macro_expansion to pop back to the value we saved here. The
88 macro expansion code promises to return only fully-expanded text,
89 so we don't need to "push" more than one level.
90
91 This is disgusting, of course. It would be cleaner to do all macro
92 expansion beforehand, and then hand that to lexptr. But we don't
93 really know where the expression ends. Remember, in a command like
94
95 (gdb) break *ADDRESS if CONDITION
96
97 we evaluate ADDRESS in the scope of the current frame, but we
98 evaluate CONDITION in the scope of the breakpoint's location. So
99 it's simply wrong to try to macro-expand the whole thing at once. */
100 const char *macro_original_text = nullptr;
101
102 /* We save all intermediate macro expansions on this obstack for the
103 duration of a single parse. The expansion text may sometimes have
104 to live past the end of the expansion, due to yacc lookahead.
105 Rather than try to be clever about saving the data for a single
106 token, we simply keep it all and delete it after parsing has
107 completed. */
108 auto_obstack expansion_obstack;
109
110 /* The type stack. */
111 struct type_stack type_stack;
112};
113
114/* This is set and cleared in c_parse. */
115
116static struct c_parse_state *cpstate;
117
118int yyparse (void);
119
120static int yylex (void);
121
122static void yyerror (const char *);
123
124static int type_aggregate_p (struct type *);
125
126%}
127
128/* Although the yacc "value" of an expression is not used,
129 since the result is stored in the structure being created,
130 other node types do have values. */
131
132%union
133 {
134 LONGEST lval;
135 struct {
136 LONGEST val;
137 struct type *type;
138 } typed_val_int;
139 struct {
140 gdb_byte val[16];
141 struct type *type;
142 } typed_val_float;
143 struct type *tval;
144 struct stoken sval;
145 struct typed_stoken tsval;
146 struct ttype tsym;
147 struct symtoken ssym;
148 int voidval;
149 const struct block *bval;
150 enum exp_opcode opcode;
151
152 struct stoken_vector svec;
153 std::vector<struct type *> *tvec;
154
155 struct type_stack *type_stack;
156
157 struct objc_class_str theclass;
158 }
159
160%{
161/* YYSTYPE gets defined by %union */
162static int parse_number (struct parser_state *par_state,
163 const char *, int, int, YYSTYPE *);
164static struct stoken operator_stoken (const char *);
165static struct stoken typename_stoken (const char *);
166static void check_parameter_typelist (std::vector<struct type *> *);
167static void write_destructor_name (struct parser_state *par_state,
168 struct stoken);
169
170#ifdef YYBISON
171static 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
280start : exp1
281 | type_exp
282 ;
283
284type_exp: type
285 { write_exp_elt_opcode(pstate, OP_TYPE);
286 write_exp_elt_type(pstate, $1);
287 write_exp_elt_opcode(pstate, OP_TYPE);}
288 | TYPEOF '(' exp ')'
289 {
290 write_exp_elt_opcode (pstate, OP_TYPEOF);
291 }
292 | TYPEOF '(' type ')'
293 {
294 write_exp_elt_opcode (pstate, OP_TYPE);
295 write_exp_elt_type (pstate, $3);
296 write_exp_elt_opcode (pstate, OP_TYPE);
297 }
298 | DECLTYPE '(' exp ')'
299 {
300 write_exp_elt_opcode (pstate, OP_DECLTYPE);
301 }
302 ;
303
304/* Expressions, including the comma operator. */
305exp1 : exp
306 | exp1 ',' exp
307 { write_exp_elt_opcode (pstate, BINOP_COMMA); }
308 ;
309
310/* Expressions, not including the comma operator. */
311exp : '*' exp %prec UNARY
312 { write_exp_elt_opcode (pstate, UNOP_IND); }
313 ;
314
315exp : '&' exp %prec UNARY
316 { write_exp_elt_opcode (pstate, UNOP_ADDR); }
317 ;
318
319exp : '-' exp %prec UNARY
320 { write_exp_elt_opcode (pstate, UNOP_NEG); }
321 ;
322
323exp : '+' exp %prec UNARY
324 { write_exp_elt_opcode (pstate, UNOP_PLUS); }
325 ;
326
327exp : '!' exp %prec UNARY
328 { write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
329 ;
330
331exp : '~' exp %prec UNARY
332 { write_exp_elt_opcode (pstate, UNOP_COMPLEMENT); }
333 ;
334
335exp : INCREMENT exp %prec UNARY
336 { write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
337 ;
338
339exp : DECREMENT exp %prec UNARY
340 { write_exp_elt_opcode (pstate, UNOP_PREDECREMENT); }
341 ;
342
343exp : exp INCREMENT %prec UNARY
344 { write_exp_elt_opcode (pstate, UNOP_POSTINCREMENT); }
345 ;
346
347exp : exp DECREMENT %prec UNARY
348 { write_exp_elt_opcode (pstate, UNOP_POSTDECREMENT); }
349 ;
350
351exp : TYPEID '(' exp ')' %prec UNARY
352 { write_exp_elt_opcode (pstate, OP_TYPEID); }
353 ;
354
355exp : TYPEID '(' type_exp ')' %prec UNARY
356 { write_exp_elt_opcode (pstate, OP_TYPEID); }
357 ;
358
359exp : SIZEOF exp %prec UNARY
360 { write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
361 ;
362
363exp : ALIGNOF '(' type_exp ')' %prec UNARY
364 { write_exp_elt_opcode (pstate, UNOP_ALIGNOF); }
365 ;
366
367exp : exp ARROW field_name
368 { write_exp_elt_opcode (pstate, STRUCTOP_PTR);
369 write_exp_string (pstate, $3);
370 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
371 ;
372
373exp : exp ARROW field_name COMPLETE
374 { pstate->mark_struct_expression ();
375 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
376 write_exp_string (pstate, $3);
377 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
378 ;
379
380exp : exp ARROW COMPLETE
381 { struct stoken s;
382 pstate->mark_struct_expression ();
383 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
384 s.ptr = "";
385 s.length = 0;
386 write_exp_string (pstate, s);
387 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
388 ;
389
390exp : exp ARROW '~' name
391 { write_exp_elt_opcode (pstate, STRUCTOP_PTR);
392 write_destructor_name (pstate, $4);
393 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
394 ;
395
396exp : exp ARROW '~' name COMPLETE
397 { pstate->mark_struct_expression ();
398 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
399 write_destructor_name (pstate, $4);
400 write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
401 ;
402
403exp : exp ARROW qualified_name
404 { /* exp->type::name becomes exp->*(&type::name) */
405 /* Note: this doesn't work if name is a
406 static member! FIXME */
407 write_exp_elt_opcode (pstate, UNOP_ADDR);
408 write_exp_elt_opcode (pstate, STRUCTOP_MPTR); }
409 ;
410
411exp : exp ARROW_STAR exp
412 { write_exp_elt_opcode (pstate, STRUCTOP_MPTR); }
413 ;
414
415exp : exp '.' field_name
416 { write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
417 write_exp_string (pstate, $3);
418 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
419 ;
420
421exp : exp '.' field_name COMPLETE
422 { pstate->mark_struct_expression ();
423 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
424 write_exp_string (pstate, $3);
425 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
426 ;
427
428exp : exp '.' COMPLETE
429 { struct stoken s;
430 pstate->mark_struct_expression ();
431 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
432 s.ptr = "";
433 s.length = 0;
434 write_exp_string (pstate, s);
435 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
436 ;
437
438exp : exp '.' '~' name
439 { write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
440 write_destructor_name (pstate, $4);
441 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
442 ;
443
444exp : exp '.' '~' name COMPLETE
445 { pstate->mark_struct_expression ();
446 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
447 write_destructor_name (pstate, $4);
448 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
449 ;
450
451exp : exp '.' qualified_name
452 { /* exp.type::name becomes exp.*(&type::name) */
453 /* Note: this doesn't work if name is a
454 static member! FIXME */
455 write_exp_elt_opcode (pstate, UNOP_ADDR);
456 write_exp_elt_opcode (pstate, STRUCTOP_MEMBER); }
457 ;
458
459exp : exp DOT_STAR exp
460 { write_exp_elt_opcode (pstate, STRUCTOP_MEMBER); }
461 ;
462
463exp : exp '[' exp1 ']'
464 { write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
465 ;
466
467exp : exp OBJC_LBRAC exp1 ']'
468 { write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
469 ;
470
471/*
472 * The rules below parse ObjC message calls of the form:
473 * '[' target selector {':' argument}* ']'
474 */
475
476exp : OBJC_LBRAC TYPENAME
477 {
478 CORE_ADDR theclass;
479
480 std::string copy = copy_name ($2.stoken);
481 theclass = lookup_objc_class (pstate->gdbarch (),
482 copy.c_str ());
483 if (theclass == 0)
484 error (_("%s is not an ObjC Class"),
485 copy.c_str ());
486 write_exp_elt_opcode (pstate, OP_LONG);
487 write_exp_elt_type (pstate,
488 parse_type (pstate)->builtin_int);
489 write_exp_elt_longcst (pstate, (LONGEST) theclass);
490 write_exp_elt_opcode (pstate, OP_LONG);
491 start_msglist();
492 }
493 msglist ']'
494 { write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
495 end_msglist (pstate);
496 write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
497 }
498 ;
499
500exp : OBJC_LBRAC CLASSNAME
501 {
502 write_exp_elt_opcode (pstate, OP_LONG);
503 write_exp_elt_type (pstate,
504 parse_type (pstate)->builtin_int);
505 write_exp_elt_longcst (pstate, (LONGEST) $2.theclass);
506 write_exp_elt_opcode (pstate, OP_LONG);
507 start_msglist();
508 }
509 msglist ']'
510 { write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
511 end_msglist (pstate);
512 write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
513 }
514 ;
515
516exp : OBJC_LBRAC exp
517 { start_msglist(); }
518 msglist ']'
519 { write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
520 end_msglist (pstate);
521 write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
522 }
523 ;
524
525msglist : name
526 { add_msglist(&$1, 0); }
527 | msgarglist
528 ;
529
530msgarglist : msgarg
531 | msgarglist msgarg
532 ;
533
534msgarg : name ':' exp
535 { add_msglist(&$1, 1); }
536 | ':' exp /* Unnamed arg. */
537 { add_msglist(0, 1); }
538 | ',' exp /* Variable number of args. */
539 { add_msglist(0, 0); }
540 ;
541
542exp : exp '('
543 /* This is to save the value of arglist_len
544 being accumulated by an outer function call. */
545 { pstate->start_arglist (); }
546 arglist ')' %prec ARROW
547 { write_exp_elt_opcode (pstate, OP_FUNCALL);
548 write_exp_elt_longcst (pstate,
549 pstate->end_arglist ());
550 write_exp_elt_opcode (pstate, OP_FUNCALL); }
551 ;
552
553/* This is here to disambiguate with the production for
554 "func()::static_var" further below, which uses
555 function_method_void. */
556exp : exp '(' ')' %prec ARROW
557 { pstate->start_arglist ();
558 write_exp_elt_opcode (pstate, OP_FUNCALL);
559 write_exp_elt_longcst (pstate,
560 pstate->end_arglist ());
561 write_exp_elt_opcode (pstate, OP_FUNCALL); }
562 ;
563
564
565exp : UNKNOWN_CPP_NAME '('
566 {
567 /* This could potentially be a an argument defined
568 lookup function (Koenig). */
569 write_exp_elt_opcode (pstate, OP_ADL_FUNC);
570 write_exp_elt_block
571 (pstate, pstate->expression_context_block);
572 write_exp_elt_sym (pstate,
573 NULL); /* Placeholder. */
574 write_exp_string (pstate, $1.stoken);
575 write_exp_elt_opcode (pstate, OP_ADL_FUNC);
576
577 /* This is to save the value of arglist_len
578 being accumulated by an outer function call. */
579
580 pstate->start_arglist ();
581 }
582 arglist ')' %prec ARROW
583 {
584 write_exp_elt_opcode (pstate, OP_FUNCALL);
585 write_exp_elt_longcst (pstate,
586 pstate->end_arglist ());
587 write_exp_elt_opcode (pstate, OP_FUNCALL);
588 }
589 ;
590
591lcurly : '{'
592 { pstate->start_arglist (); }
593 ;
594
595arglist :
596 ;
597
598arglist : exp
599 { pstate->arglist_len = 1; }
600 ;
601
602arglist : arglist ',' exp %prec ABOVE_COMMA
603 { pstate->arglist_len++; }
604 ;
605
606function_method: exp '(' parameter_typelist ')' const_or_volatile
607 {
608 std::vector<struct type *> *type_list = $3;
609 LONGEST len = type_list->size ();
610
611 write_exp_elt_opcode (pstate, TYPE_INSTANCE);
612 /* Save the const/volatile qualifiers as
613 recorded by the const_or_volatile
614 production's actions. */
615 write_exp_elt_longcst
616 (pstate,
617 (cpstate->type_stack
618 .follow_type_instance_flags ()));
619 write_exp_elt_longcst (pstate, len);
620 for (type *type_elt : *type_list)
621 write_exp_elt_type (pstate, type_elt);
622 write_exp_elt_longcst(pstate, len);
623 write_exp_elt_opcode (pstate, TYPE_INSTANCE);
624 }
625 ;
626
627function_method_void: exp '(' ')' const_or_volatile
628 { write_exp_elt_opcode (pstate, TYPE_INSTANCE);
629 /* See above. */
630 write_exp_elt_longcst
631 (pstate,
632 cpstate->type_stack.follow_type_instance_flags ());
633 write_exp_elt_longcst (pstate, 0);
634 write_exp_elt_longcst (pstate, 0);
635 write_exp_elt_opcode (pstate, TYPE_INSTANCE);
636 }
637 ;
638
639exp : function_method
640 ;
641
642/* Normally we must interpret "func()" as a function call, instead of
643 a type. The user needs to write func(void) to disambiguate.
644 However, in the "func()::static_var" case, there's no
645 ambiguity. */
646function_method_void_or_typelist: function_method
647 | function_method_void
648 ;
649
650exp : function_method_void_or_typelist COLONCOLON name
651 {
652 write_exp_elt_opcode (pstate, OP_FUNC_STATIC_VAR);
653 write_exp_string (pstate, $3);
654 write_exp_elt_opcode (pstate, OP_FUNC_STATIC_VAR);
655 }
656 ;
657
658rcurly : '}'
659 { $$ = pstate->end_arglist () - 1; }
660 ;
661exp : lcurly arglist rcurly %prec ARROW
662 { write_exp_elt_opcode (pstate, OP_ARRAY);
663 write_exp_elt_longcst (pstate, (LONGEST) 0);
664 write_exp_elt_longcst (pstate, (LONGEST) $3);
665 write_exp_elt_opcode (pstate, OP_ARRAY); }
666 ;
667
668exp : lcurly type_exp rcurly exp %prec UNARY
669 { write_exp_elt_opcode (pstate, UNOP_MEMVAL_TYPE); }
670 ;
671
672exp : '(' type_exp ')' exp %prec UNARY
673 { write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
674 ;
675
676exp : '(' exp1 ')'
677 { }
678 ;
679
680/* Binary operators in order of decreasing precedence. */
681
682exp : exp '@' exp
683 { write_exp_elt_opcode (pstate, BINOP_REPEAT); }
684 ;
685
686exp : exp '*' exp
687 { write_exp_elt_opcode (pstate, BINOP_MUL); }
688 ;
689
690exp : exp '/' exp
691 { write_exp_elt_opcode (pstate, BINOP_DIV); }
692 ;
693
694exp : exp '%' exp
695 { write_exp_elt_opcode (pstate, BINOP_REM); }
696 ;
697
698exp : exp '+' exp
699 { write_exp_elt_opcode (pstate, BINOP_ADD); }
700 ;
701
702exp : exp '-' exp
703 { write_exp_elt_opcode (pstate, BINOP_SUB); }
704 ;
705
706exp : exp LSH exp
707 { write_exp_elt_opcode (pstate, BINOP_LSH); }
708 ;
709
710exp : exp RSH exp
711 { write_exp_elt_opcode (pstate, BINOP_RSH); }
712 ;
713
714exp : exp EQUAL exp
715 { write_exp_elt_opcode (pstate, BINOP_EQUAL); }
716 ;
717
718exp : exp NOTEQUAL exp
719 { write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
720 ;
721
722exp : exp LEQ exp
723 { write_exp_elt_opcode (pstate, BINOP_LEQ); }
724 ;
725
726exp : exp GEQ exp
727 { write_exp_elt_opcode (pstate, BINOP_GEQ); }
728 ;
729
730exp : exp '<' exp
731 { write_exp_elt_opcode (pstate, BINOP_LESS); }
732 ;
733
734exp : exp '>' exp
735 { write_exp_elt_opcode (pstate, BINOP_GTR); }
736 ;
737
738exp : exp '&' exp
739 { write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
740 ;
741
742exp : exp '^' exp
743 { write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
744 ;
745
746exp : exp '|' exp
747 { write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
748 ;
749
750exp : exp ANDAND exp
751 { write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
752 ;
753
754exp : exp OROR exp
755 { write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
756 ;
757
758exp : exp '?' exp ':' exp %prec '?'
759 { write_exp_elt_opcode (pstate, TERNOP_COND); }
760 ;
761
762exp : exp '=' exp
763 { write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
764 ;
765
766exp : exp ASSIGN_MODIFY exp
767 { write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
768 write_exp_elt_opcode (pstate, $2);
769 write_exp_elt_opcode (pstate,
770 BINOP_ASSIGN_MODIFY); }
771 ;
772
773exp : INT
774 { write_exp_elt_opcode (pstate, OP_LONG);
775 write_exp_elt_type (pstate, $1.type);
776 write_exp_elt_longcst (pstate, (LONGEST) ($1.val));
777 write_exp_elt_opcode (pstate, OP_LONG); }
778 ;
779
780exp : COMPLEX_INT
781 {
782 write_exp_elt_opcode (pstate, OP_LONG);
783 write_exp_elt_type (pstate, TYPE_TARGET_TYPE ($1.type));
784 write_exp_elt_longcst (pstate, 0);
785 write_exp_elt_opcode (pstate, OP_LONG);
786 write_exp_elt_opcode (pstate, OP_LONG);
787 write_exp_elt_type (pstate, TYPE_TARGET_TYPE ($1.type));
788 write_exp_elt_longcst (pstate, (LONGEST) ($1.val));
789 write_exp_elt_opcode (pstate, OP_LONG);
790 write_exp_elt_opcode (pstate, OP_COMPLEX);
791 write_exp_elt_type (pstate, $1.type);
792 write_exp_elt_opcode (pstate, OP_COMPLEX);
793 }
794 ;
795
796exp : CHAR
797 {
798 struct stoken_vector vec;
799 vec.len = 1;
800 vec.tokens = &$1;
801 write_exp_string_vector (pstate, $1.type, &vec);
802 }
803 ;
804
805exp : NAME_OR_INT
806 { YYSTYPE val;
807 parse_number (pstate, $1.stoken.ptr,
808 $1.stoken.length, 0, &val);
809 write_exp_elt_opcode (pstate, OP_LONG);
810 write_exp_elt_type (pstate, val.typed_val_int.type);
811 write_exp_elt_longcst (pstate,
812 (LONGEST) val.typed_val_int.val);
813 write_exp_elt_opcode (pstate, OP_LONG);
814 }
815 ;
816
817
818exp : FLOAT
819 { write_exp_elt_opcode (pstate, OP_FLOAT);
820 write_exp_elt_type (pstate, $1.type);
821 write_exp_elt_floatcst (pstate, $1.val);
822 write_exp_elt_opcode (pstate, OP_FLOAT); }
823 ;
824
825exp : COMPLEX_FLOAT
826 {
827 struct type *underlying
828 = TYPE_TARGET_TYPE ($1.type);
829
830 write_exp_elt_opcode (pstate, OP_FLOAT);
831 write_exp_elt_type (pstate, underlying);
832 gdb_byte val[16];
833 target_float_from_host_double (val, underlying, 0);
834 write_exp_elt_floatcst (pstate, val);
835 write_exp_elt_opcode (pstate, OP_FLOAT);
836 write_exp_elt_opcode (pstate, OP_FLOAT);
837 write_exp_elt_type (pstate, underlying);
838 write_exp_elt_floatcst (pstate, $1.val);
839 write_exp_elt_opcode (pstate, OP_FLOAT);
840 write_exp_elt_opcode (pstate, OP_COMPLEX);
841 write_exp_elt_type (pstate, $1.type);
842 write_exp_elt_opcode (pstate, OP_COMPLEX);
843 }
844 ;
845
846exp : variable
847 ;
848
849exp : DOLLAR_VARIABLE
850 {
851 write_dollar_variable (pstate, $1);
852 }
853 ;
854
855exp : SELECTOR '(' name ')'
856 {
857 write_exp_elt_opcode (pstate, OP_OBJC_SELECTOR);
858 write_exp_string (pstate, $3);
859 write_exp_elt_opcode (pstate, OP_OBJC_SELECTOR); }
860 ;
861
862exp : SIZEOF '(' type ')' %prec UNARY
863 { struct type *type = $3;
864 write_exp_elt_opcode (pstate, OP_LONG);
865 write_exp_elt_type (pstate, lookup_signed_typename
866 (pstate->language (),
867 "int"));
868 type = check_typedef (type);
869
870 /* $5.3.3/2 of the C++ Standard (n3290 draft)
871 says of sizeof: "When applied to a reference
872 or a reference type, the result is the size of
873 the referenced type." */
874 if (TYPE_IS_REFERENCE (type))
875 type = check_typedef (TYPE_TARGET_TYPE (type));
876 write_exp_elt_longcst (pstate,
877 (LONGEST) TYPE_LENGTH (type));
878 write_exp_elt_opcode (pstate, OP_LONG); }
879 ;
880
881exp : REINTERPRET_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
882 { write_exp_elt_opcode (pstate,
883 UNOP_REINTERPRET_CAST); }
884 ;
885
886exp : STATIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
887 { write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
888 ;
889
890exp : DYNAMIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
891 { write_exp_elt_opcode (pstate, UNOP_DYNAMIC_CAST); }
892 ;
893
894exp : CONST_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
895 { /* We could do more error checking here, but
896 it doesn't seem worthwhile. */
897 write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
898 ;
899
900string_exp:
901 STRING
902 {
903 /* We copy the string here, and not in the
904 lexer, to guarantee that we do not leak a
905 string. Note that we follow the
906 NUL-termination convention of the
907 lexer. */
908 struct typed_stoken *vec = XNEW (struct typed_stoken);
909 $$.len = 1;
910 $$.tokens = vec;
911
912 vec->type = $1.type;
913 vec->length = $1.length;
914 vec->ptr = (char *) malloc ($1.length + 1);
915 memcpy (vec->ptr, $1.ptr, $1.length + 1);
916 }
917
918 | string_exp STRING
919 {
920 /* Note that we NUL-terminate here, but just
921 for convenience. */
922 char *p;
923 ++$$.len;
924 $$.tokens = XRESIZEVEC (struct typed_stoken,
925 $$.tokens, $$.len);
926
927 p = (char *) malloc ($2.length + 1);
928 memcpy (p, $2.ptr, $2.length + 1);
929
930 $$.tokens[$$.len - 1].type = $2.type;
931 $$.tokens[$$.len - 1].length = $2.length;
932 $$.tokens[$$.len - 1].ptr = p;
933 }
934 ;
935
936exp : string_exp
937 {
938 int i;
939 c_string_type type = C_STRING;
940
941 for (i = 0; i < $1.len; ++i)
942 {
943 switch ($1.tokens[i].type)
944 {
945 case C_STRING:
946 break;
947 case C_WIDE_STRING:
948 case C_STRING_16:
949 case C_STRING_32:
950 if (type != C_STRING
951 && type != $1.tokens[i].type)
952 error (_("Undefined string concatenation."));
953 type = (enum c_string_type_values) $1.tokens[i].type;
954 break;
955 default:
956 /* internal error */
957 internal_error (__FILE__, __LINE__,
958 "unrecognized type in string concatenation");
959 }
960 }
961
962 write_exp_string_vector (pstate, type, &$1);
963 for (i = 0; i < $1.len; ++i)
964 free ($1.tokens[i].ptr);
965 free ($1.tokens);
966 }
967 ;
968
969exp : NSSTRING /* ObjC NextStep NSString constant
970 * of the form '@' '"' string '"'.
971 */
972 { write_exp_elt_opcode (pstate, OP_OBJC_NSSTRING);
973 write_exp_string (pstate, $1);
974 write_exp_elt_opcode (pstate, OP_OBJC_NSSTRING); }
975 ;
976
977/* C++. */
978exp : TRUEKEYWORD
979 { write_exp_elt_opcode (pstate, OP_LONG);
980 write_exp_elt_type (pstate,
981 parse_type (pstate)->builtin_bool);
982 write_exp_elt_longcst (pstate, (LONGEST) 1);
983 write_exp_elt_opcode (pstate, OP_LONG); }
984 ;
985
986exp : FALSEKEYWORD
987 { write_exp_elt_opcode (pstate, OP_LONG);
988 write_exp_elt_type (pstate,
989 parse_type (pstate)->builtin_bool);
990 write_exp_elt_longcst (pstate, (LONGEST) 0);
991 write_exp_elt_opcode (pstate, OP_LONG); }
992 ;
993
994/* end of C++. */
995
996block : BLOCKNAME
997 {
998 if ($1.sym.symbol)
999 $$ = SYMBOL_BLOCK_VALUE ($1.sym.symbol);
1000 else
1001 error (_("No file or function \"%s\"."),
1002 copy_name ($1.stoken).c_str ());
1003 }
1004 | FILENAME
1005 {
1006 $$ = $1;
1007 }
1008 ;
1009
1010block : block COLONCOLON name
1011 {
1012 std::string copy = copy_name ($3);
1013 struct symbol *tem
1014 = lookup_symbol (copy.c_str (), $1,
1015 VAR_DOMAIN, NULL).symbol;
1016
1017 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
1018 error (_("No function \"%s\" in specified context."),
1019 copy.c_str ());
1020 $$ = SYMBOL_BLOCK_VALUE (tem); }
1021 ;
1022
1023variable: name_not_typename ENTRY
1024 { struct symbol *sym = $1.sym.symbol;
1025
1026 if (sym == NULL || !SYMBOL_IS_ARGUMENT (sym)
1027 || !symbol_read_needs_frame (sym))
1028 error (_("@entry can be used only for function "
1029 "parameters, not for \"%s\""),
1030 copy_name ($1.stoken).c_str ());
1031
1032 write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
1033 write_exp_elt_sym (pstate, sym);
1034 write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
1035 }
1036 ;
1037
1038variable: block COLONCOLON name
1039 {
1040 std::string copy = copy_name ($3);
1041 struct block_symbol sym
1042 = lookup_symbol (copy.c_str (), $1,
1043 VAR_DOMAIN, NULL);
1044
1045 if (sym.symbol == 0)
1046 error (_("No symbol \"%s\" in specified context."),
1047 copy.c_str ());
1048 if (symbol_read_needs_frame (sym.symbol))
1049 pstate->block_tracker->update (sym);
1050
1051 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1052 write_exp_elt_block (pstate, sym.block);
1053 write_exp_elt_sym (pstate, sym.symbol);
1054 write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
1055 ;
1056
1057qualified_name: TYPENAME COLONCOLON name
1058 {
1059 struct type *type = $1.type;
1060 type = check_typedef (type);
1061 if (!type_aggregate_p (type))
1062 error (_("`%s' is not defined as an aggregate type."),
1063 TYPE_SAFE_NAME (type));
1064
1065 write_exp_elt_opcode (pstate, OP_SCOPE);
1066 write_exp_elt_type (pstate, type);
1067 write_exp_string (pstate, $3);
1068 write_exp_elt_opcode (pstate, OP_SCOPE);
1069 }
1070 | TYPENAME COLONCOLON '~' name
1071 {
1072 struct type *type = $1.type;
1073 struct stoken tmp_token;
1074 char *buf;
1075
1076 type = check_typedef (type);
1077 if (!type_aggregate_p (type))
1078 error (_("`%s' is not defined as an aggregate type."),
1079 TYPE_SAFE_NAME (type));
1080 buf = (char *) alloca ($4.length + 2);
1081 tmp_token.ptr = buf;
1082 tmp_token.length = $4.length + 1;
1083 buf[0] = '~';
1084 memcpy (buf+1, $4.ptr, $4.length);
1085 buf[tmp_token.length] = 0;
1086
1087 /* Check for valid destructor name. */
1088 destructor_name_p (tmp_token.ptr, $1.type);
1089 write_exp_elt_opcode (pstate, OP_SCOPE);
1090 write_exp_elt_type (pstate, type);
1091 write_exp_string (pstate, tmp_token);
1092 write_exp_elt_opcode (pstate, OP_SCOPE);
1093 }
1094 | TYPENAME COLONCOLON name COLONCOLON name
1095 {
1096 std::string copy = copy_name ($3);
1097 error (_("No type \"%s\" within class "
1098 "or namespace \"%s\"."),
1099 copy.c_str (), TYPE_SAFE_NAME ($1.type));
1100 }
1101 ;
1102
1103variable: qualified_name
1104 | COLONCOLON name_not_typename
1105 {
1106 std::string name = copy_name ($2.stoken);
1107 struct symbol *sym;
1108 struct bound_minimal_symbol msymbol;
1109
1110 sym
1111 = lookup_symbol (name.c_str (),
1112 (const struct block *) NULL,
1113 VAR_DOMAIN, NULL).symbol;
1114 if (sym)
1115 {
1116 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1117 write_exp_elt_block (pstate, NULL);
1118 write_exp_elt_sym (pstate, sym);
1119 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1120 break;
1121 }
1122
1123 msymbol = lookup_bound_minimal_symbol (name.c_str ());
1124 if (msymbol.minsym != NULL)
1125 write_exp_msymbol (pstate, msymbol);
1126 else if (!have_full_symbols () && !have_partial_symbols ())
1127 error (_("No symbol table is loaded. Use the \"file\" command."));
1128 else
1129 error (_("No symbol \"%s\" in current context."),
1130 name.c_str ());
1131 }
1132 ;
1133
1134variable: name_not_typename
1135 { struct block_symbol sym = $1.sym;
1136
1137 if (sym.symbol)
1138 {
1139 if (symbol_read_needs_frame (sym.symbol))
1140 pstate->block_tracker->update (sym);
1141
1142 /* If we found a function, see if it's
1143 an ifunc resolver that has the same
1144 address as the ifunc symbol itself.
1145 If so, prefer the ifunc symbol. */
1146
1147 bound_minimal_symbol resolver
1148 = find_gnu_ifunc (sym.symbol);
1149 if (resolver.minsym != NULL)
1150 write_exp_msymbol (pstate, resolver);
1151 else
1152 {
1153 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1154 write_exp_elt_block (pstate, sym.block);
1155 write_exp_elt_sym (pstate, sym.symbol);
1156 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1157 }
1158 }
1159 else if ($1.is_a_field_of_this)
1160 {
1161 /* C++: it hangs off of `this'. Must
1162 not inadvertently convert from a method call
1163 to data ref. */
1164 pstate->block_tracker->update (sym);
1165 write_exp_elt_opcode (pstate, OP_THIS);
1166 write_exp_elt_opcode (pstate, OP_THIS);
1167 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
1168 write_exp_string (pstate, $1.stoken);
1169 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
1170 }
1171 else
1172 {
1173 std::string arg = copy_name ($1.stoken);
1174
1175 bound_minimal_symbol msymbol
1176 = lookup_bound_minimal_symbol (arg.c_str ());
1177 if (msymbol.minsym == NULL)
1178 {
1179 if (!have_full_symbols () && !have_partial_symbols ())
1180 error (_("No symbol table is loaded. Use the \"file\" command."));
1181 else
1182 error (_("No symbol \"%s\" in current context."),
1183 arg.c_str ());
1184 }
1185
1186 /* This minsym might be an alias for
1187 another function. See if we can find
1188 the debug symbol for the target, and
1189 if so, use it instead, since it has
1190 return type / prototype info. This
1191 is important for example for "p
1192 *__errno_location()". */
1193 symbol *alias_target
1194 = ((msymbol.minsym->type != mst_text_gnu_ifunc
1195 && msymbol.minsym->type != mst_data_gnu_ifunc)
1196 ? find_function_alias_target (msymbol)
1197 : NULL);
1198 if (alias_target != NULL)
1199 {
1200 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1201 write_exp_elt_block
1202 (pstate, SYMBOL_BLOCK_VALUE (alias_target));
1203 write_exp_elt_sym (pstate, alias_target);
1204 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
1205 }
1206 else
1207 write_exp_msymbol (pstate, msymbol);
1208 }
1209 }
1210 ;
1211
1212const_or_volatile: const_or_volatile_noopt
1213 |
1214 ;
1215
1216single_qualifier:
1217 CONST_KEYWORD
1218 { cpstate->type_stack.insert (tp_const); }
1219 | VOLATILE_KEYWORD
1220 { cpstate->type_stack.insert (tp_volatile); }
1221 | ATOMIC
1222 { cpstate->type_stack.insert (tp_atomic); }
1223 | RESTRICT
1224 { cpstate->type_stack.insert (tp_restrict); }
1225 | '@' NAME
1226 {
1227 cpstate->type_stack.insert (pstate,
1228 copy_name ($2.stoken).c_str ());
1229 }
1230 ;
1231
1232qualifier_seq_noopt:
1233 single_qualifier
1234 | qualifier_seq single_qualifier
1235 ;
1236
1237qualifier_seq:
1238 qualifier_seq_noopt
1239 |
1240 ;
1241
1242ptr_operator:
1243 ptr_operator '*'
1244 { cpstate->type_stack.insert (tp_pointer); }
1245 qualifier_seq
1246 | '*'
1247 { cpstate->type_stack.insert (tp_pointer); }
1248 qualifier_seq
1249 | '&'
1250 { cpstate->type_stack.insert (tp_reference); }
1251 | '&' ptr_operator
1252 { cpstate->type_stack.insert (tp_reference); }
1253 | ANDAND
1254 { cpstate->type_stack.insert (tp_rvalue_reference); }
1255 | ANDAND ptr_operator
1256 { cpstate->type_stack.insert (tp_rvalue_reference); }
1257 ;
1258
1259ptr_operator_ts: ptr_operator
1260 {
1261 $$ = cpstate->type_stack.create ();
1262 cpstate->type_stacks.emplace_back ($$);
1263 }
1264 ;
1265
1266abs_decl: ptr_operator_ts direct_abs_decl
1267 { $$ = $2->append ($1); }
1268 | ptr_operator_ts
1269 | direct_abs_decl
1270 ;
1271
1272direct_abs_decl: '(' abs_decl ')'
1273 { $$ = $2; }
1274 | direct_abs_decl array_mod
1275 {
1276 cpstate->type_stack.push ($1);
1277 cpstate->type_stack.push ($2);
1278 cpstate->type_stack.push (tp_array);
1279 $$ = cpstate->type_stack.create ();
1280 cpstate->type_stacks.emplace_back ($$);
1281 }
1282 | array_mod
1283 {
1284 cpstate->type_stack.push ($1);
1285 cpstate->type_stack.push (tp_array);
1286 $$ = cpstate->type_stack.create ();
1287 cpstate->type_stacks.emplace_back ($$);
1288 }
1289
1290 | direct_abs_decl func_mod
1291 {
1292 cpstate->type_stack.push ($1);
1293 cpstate->type_stack.push ($2);
1294 $$ = cpstate->type_stack.create ();
1295 cpstate->type_stacks.emplace_back ($$);
1296 }
1297 | func_mod
1298 {
1299 cpstate->type_stack.push ($1);
1300 $$ = cpstate->type_stack.create ();
1301 cpstate->type_stacks.emplace_back ($$);
1302 }
1303 ;
1304
1305array_mod: '[' ']'
1306 { $$ = -1; }
1307 | OBJC_LBRAC ']'
1308 { $$ = -1; }
1309 | '[' INT ']'
1310 { $$ = $2.val; }
1311 | OBJC_LBRAC INT ']'
1312 { $$ = $2.val; }
1313 ;
1314
1315func_mod: '(' ')'
1316 {
1317 $$ = new std::vector<struct type *>;
1318 cpstate->type_lists.emplace_back ($$);
1319 }
1320 | '(' parameter_typelist ')'
1321 { $$ = $2; }
1322 ;
1323
1324/* We used to try to recognize pointer to member types here, but
1325 that didn't work (shift/reduce conflicts meant that these rules never
1326 got executed). The problem is that
1327 int (foo::bar::baz::bizzle)
1328 is a function type but
1329 int (foo::bar::baz::bizzle::*)
1330 is a pointer to member type. Stroustrup loses again! */
1331
1332type : ptype
1333 ;
1334
1335/* A helper production that recognizes scalar types that can validly
1336 be used with _Complex. */
1337
1338scalar_type:
1339 INT_KEYWORD
1340 { $$ = lookup_signed_typename (pstate->language (),
1341 "int"); }
1342 | LONG
1343 { $$ = lookup_signed_typename (pstate->language (),
1344 "long"); }
1345 | SHORT
1346 { $$ = lookup_signed_typename (pstate->language (),
1347 "short"); }
1348 | LONG INT_KEYWORD
1349 { $$ = lookup_signed_typename (pstate->language (),
1350 "long"); }
1351 | LONG SIGNED_KEYWORD INT_KEYWORD
1352 { $$ = lookup_signed_typename (pstate->language (),
1353 "long"); }
1354 | LONG SIGNED_KEYWORD
1355 { $$ = lookup_signed_typename (pstate->language (),
1356 "long"); }
1357 | SIGNED_KEYWORD LONG INT_KEYWORD
1358 { $$ = lookup_signed_typename (pstate->language (),
1359 "long"); }
1360 | UNSIGNED LONG INT_KEYWORD
1361 { $$ = lookup_unsigned_typename (pstate->language (),
1362 "long"); }
1363 | LONG UNSIGNED INT_KEYWORD
1364 { $$ = lookup_unsigned_typename (pstate->language (),
1365 "long"); }
1366 | LONG UNSIGNED
1367 { $$ = lookup_unsigned_typename (pstate->language (),
1368 "long"); }
1369 | LONG LONG
1370 { $$ = lookup_signed_typename (pstate->language (),
1371 "long long"); }
1372 | LONG LONG INT_KEYWORD
1373 { $$ = lookup_signed_typename (pstate->language (),
1374 "long long"); }
1375 | LONG LONG SIGNED_KEYWORD INT_KEYWORD
1376 { $$ = lookup_signed_typename (pstate->language (),
1377 "long long"); }
1378 | LONG LONG SIGNED_KEYWORD
1379 { $$ = lookup_signed_typename (pstate->language (),
1380 "long long"); }
1381 | SIGNED_KEYWORD LONG LONG
1382 { $$ = lookup_signed_typename (pstate->language (),
1383 "long long"); }
1384 | SIGNED_KEYWORD LONG LONG INT_KEYWORD
1385 { $$ = lookup_signed_typename (pstate->language (),
1386 "long long"); }
1387 | UNSIGNED LONG LONG
1388 { $$ = lookup_unsigned_typename (pstate->language (),
1389 "long long"); }
1390 | UNSIGNED LONG LONG INT_KEYWORD
1391 { $$ = lookup_unsigned_typename (pstate->language (),
1392 "long long"); }
1393 | LONG LONG UNSIGNED
1394 { $$ = lookup_unsigned_typename (pstate->language (),
1395 "long long"); }
1396 | LONG LONG UNSIGNED INT_KEYWORD
1397 { $$ = lookup_unsigned_typename (pstate->language (),
1398 "long long"); }
1399 | SHORT INT_KEYWORD
1400 { $$ = lookup_signed_typename (pstate->language (),
1401 "short"); }
1402 | SHORT SIGNED_KEYWORD INT_KEYWORD
1403 { $$ = lookup_signed_typename (pstate->language (),
1404 "short"); }
1405 | SHORT SIGNED_KEYWORD
1406 { $$ = lookup_signed_typename (pstate->language (),
1407 "short"); }
1408 | UNSIGNED SHORT INT_KEYWORD
1409 { $$ = lookup_unsigned_typename (pstate->language (),
1410 "short"); }
1411 | SHORT UNSIGNED
1412 { $$ = lookup_unsigned_typename (pstate->language (),
1413 "short"); }
1414 | SHORT UNSIGNED INT_KEYWORD
1415 { $$ = lookup_unsigned_typename (pstate->language (),
1416 "short"); }
1417 | DOUBLE_KEYWORD
1418 { $$ = lookup_typename (pstate->language (),
1419 "double",
1420 NULL,
1421 0); }
1422 | FLOAT_KEYWORD
1423 { $$ = lookup_typename (pstate->language (),
1424 "float",
1425 NULL,
1426 0); }
1427 | LONG DOUBLE_KEYWORD
1428 { $$ = lookup_typename (pstate->language (),
1429 "long double",
1430 NULL,
1431 0); }
1432 | UNSIGNED type_name
1433 { $$ = lookup_unsigned_typename (pstate->language (),
1434 $2.type->name ()); }
1435 | UNSIGNED
1436 { $$ = lookup_unsigned_typename (pstate->language (),
1437 "int"); }
1438 | SIGNED_KEYWORD type_name
1439 { $$ = lookup_signed_typename (pstate->language (),
1440 $2.type->name ()); }
1441 | SIGNED_KEYWORD
1442 { $$ = lookup_signed_typename (pstate->language (),
1443 "int"); }
1444 ;
1445
1446/* Implements (approximately): (type-qualifier)* type-specifier.
1447
1448 When type-specifier is only ever a single word, like 'float' then these
1449 arrive as pre-built TYPENAME tokens thanks to the classify_name
1450 function. However, when a type-specifier can contain multiple words,
1451 for example 'double' can appear as just 'double' or 'long double', and
1452 similarly 'long' can appear as just 'long' or in 'long double', then
1453 these type-specifiers are parsed into their own tokens in the function
1454 lex_one_token and the ident_tokens array. These separate tokens are all
1455 recognised here. */
1456typebase
1457 : TYPENAME
1458 { $$ = $1.type; }
1459 | scalar_type
1460 { $$ = $1; }
1461 | COMPLEX scalar_type
1462 {
1463 $$ = init_complex_type (nullptr, $2);
1464 }
1465 | STRUCT name
1466 { $$
1467 = lookup_struct (copy_name ($2).c_str (),
1468 pstate->expression_context_block);
1469 }
1470 | STRUCT COMPLETE
1471 {
1472 pstate->mark_completion_tag (TYPE_CODE_STRUCT,
1473 "", 0);
1474 $$ = NULL;
1475 }
1476 | STRUCT name COMPLETE
1477 {
1478 pstate->mark_completion_tag (TYPE_CODE_STRUCT,
1479 $2.ptr, $2.length);
1480 $$ = NULL;
1481 }
1482 | CLASS name
1483 { $$ = lookup_struct
1484 (copy_name ($2).c_str (),
1485 pstate->expression_context_block);
1486 }
1487 | CLASS COMPLETE
1488 {
1489 pstate->mark_completion_tag (TYPE_CODE_STRUCT,
1490 "", 0);
1491 $$ = NULL;
1492 }
1493 | CLASS name COMPLETE
1494 {
1495 pstate->mark_completion_tag (TYPE_CODE_STRUCT,
1496 $2.ptr, $2.length);
1497 $$ = NULL;
1498 }
1499 | UNION name
1500 { $$
1501 = lookup_union (copy_name ($2).c_str (),
1502 pstate->expression_context_block);
1503 }
1504 | UNION COMPLETE
1505 {
1506 pstate->mark_completion_tag (TYPE_CODE_UNION,
1507 "", 0);
1508 $$ = NULL;
1509 }
1510 | UNION name COMPLETE
1511 {
1512 pstate->mark_completion_tag (TYPE_CODE_UNION,
1513 $2.ptr, $2.length);
1514 $$ = NULL;
1515 }
1516 | ENUM name
1517 { $$ = lookup_enum (copy_name ($2).c_str (),
1518 pstate->expression_context_block);
1519 }
1520 | ENUM COMPLETE
1521 {
1522 pstate->mark_completion_tag (TYPE_CODE_ENUM, "", 0);
1523 $$ = NULL;
1524 }
1525 | ENUM name COMPLETE
1526 {
1527 pstate->mark_completion_tag (TYPE_CODE_ENUM, $2.ptr,
1528 $2.length);
1529 $$ = NULL;
1530 }
1531 /* It appears that this rule for templates is never
1532 reduced; template recognition happens by lookahead
1533 in the token processing code in yylex. */
1534 | TEMPLATE name '<' type '>'
1535 { $$ = lookup_template_type
1536 (copy_name($2).c_str (), $4,
1537 pstate->expression_context_block);
1538 }
1539 | qualifier_seq_noopt typebase
1540 { $$ = cpstate->type_stack.follow_types ($2); }
1541 | typebase qualifier_seq_noopt
1542 { $$ = cpstate->type_stack.follow_types ($1); }
1543 ;
1544
1545type_name: TYPENAME
1546 | INT_KEYWORD
1547 {
1548 $$.stoken.ptr = "int";
1549 $$.stoken.length = 3;
1550 $$.type = lookup_signed_typename (pstate->language (),
1551 "int");
1552 }
1553 | LONG
1554 {
1555 $$.stoken.ptr = "long";
1556 $$.stoken.length = 4;
1557 $$.type = lookup_signed_typename (pstate->language (),
1558 "long");
1559 }
1560 | SHORT
1561 {
1562 $$.stoken.ptr = "short";
1563 $$.stoken.length = 5;
1564 $$.type = lookup_signed_typename (pstate->language (),
1565 "short");
1566 }
1567 ;
1568
1569parameter_typelist:
1570 nonempty_typelist
1571 { check_parameter_typelist ($1); }
1572 | nonempty_typelist ',' DOTDOTDOT
1573 {
1574 $1->push_back (NULL);
1575 check_parameter_typelist ($1);
1576 $$ = $1;
1577 }
1578 ;
1579
1580nonempty_typelist
1581 : type
1582 {
1583 std::vector<struct type *> *typelist
1584 = new std::vector<struct type *>;
1585 cpstate->type_lists.emplace_back (typelist);
1586
1587 typelist->push_back ($1);
1588 $$ = typelist;
1589 }
1590 | nonempty_typelist ',' type
1591 {
1592 $1->push_back ($3);
1593 $$ = $1;
1594 }
1595 ;
1596
1597ptype : typebase
1598 | ptype abs_decl
1599 {
1600 cpstate->type_stack.push ($2);
1601 $$ = cpstate->type_stack.follow_types ($1);
1602 }
1603 ;
1604
1605conversion_type_id: typebase conversion_declarator
1606 { $$ = cpstate->type_stack.follow_types ($1); }
1607 ;
1608
1609conversion_declarator: /* Nothing. */
1610 | ptr_operator conversion_declarator
1611 ;
1612
1613const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
1614 | VOLATILE_KEYWORD CONST_KEYWORD
1615 ;
1616
1617const_or_volatile_noopt: const_and_volatile
1618 { cpstate->type_stack.insert (tp_const);
1619 cpstate->type_stack.insert (tp_volatile);
1620 }
1621 | CONST_KEYWORD
1622 { cpstate->type_stack.insert (tp_const); }
1623 | VOLATILE_KEYWORD
1624 { cpstate->type_stack.insert (tp_volatile); }
1625 ;
1626
1627oper: OPERATOR NEW
1628 { $$ = operator_stoken (" new"); }
1629 | OPERATOR DELETE
1630 { $$ = operator_stoken (" delete"); }
1631 | OPERATOR NEW '[' ']'
1632 { $$ = operator_stoken (" new[]"); }
1633 | OPERATOR DELETE '[' ']'
1634 { $$ = operator_stoken (" delete[]"); }
1635 | OPERATOR NEW OBJC_LBRAC ']'
1636 { $$ = operator_stoken (" new[]"); }
1637 | OPERATOR DELETE OBJC_LBRAC ']'
1638 { $$ = operator_stoken (" delete[]"); }
1639 | OPERATOR '+'
1640 { $$ = operator_stoken ("+"); }
1641 | OPERATOR '-'
1642 { $$ = operator_stoken ("-"); }
1643 | OPERATOR '*'
1644 { $$ = operator_stoken ("*"); }
1645 | OPERATOR '/'
1646 { $$ = operator_stoken ("/"); }
1647 | OPERATOR '%'
1648 { $$ = operator_stoken ("%"); }
1649 | OPERATOR '^'
1650 { $$ = operator_stoken ("^"); }
1651 | OPERATOR '&'
1652 { $$ = operator_stoken ("&"); }
1653 | OPERATOR '|'
1654 { $$ = operator_stoken ("|"); }
1655 | OPERATOR '~'
1656 { $$ = operator_stoken ("~"); }
1657 | OPERATOR '!'
1658 { $$ = operator_stoken ("!"); }
1659 | OPERATOR '='
1660 { $$ = operator_stoken ("="); }
1661 | OPERATOR '<'
1662 { $$ = operator_stoken ("<"); }
1663 | OPERATOR '>'
1664 { $$ = operator_stoken (">"); }
1665 | OPERATOR ASSIGN_MODIFY
1666 { const char *op = " unknown";
1667 switch ($2)
1668 {
1669 case BINOP_RSH:
1670 op = ">>=";
1671 break;
1672 case BINOP_LSH:
1673 op = "<<=";
1674 break;
1675 case BINOP_ADD:
1676 op = "+=";
1677 break;
1678 case BINOP_SUB:
1679 op = "-=";
1680 break;
1681 case BINOP_MUL:
1682 op = "*=";
1683 break;
1684 case BINOP_DIV:
1685 op = "/=";
1686 break;
1687 case BINOP_REM:
1688 op = "%=";
1689 break;
1690 case BINOP_BITWISE_IOR:
1691 op = "|=";
1692 break;
1693 case BINOP_BITWISE_AND:
1694 op = "&=";
1695 break;
1696 case BINOP_BITWISE_XOR:
1697 op = "^=";
1698 break;
1699 default:
1700 break;
1701 }
1702
1703 $$ = operator_stoken (op);
1704 }
1705 | OPERATOR LSH
1706 { $$ = operator_stoken ("<<"); }
1707 | OPERATOR RSH
1708 { $$ = operator_stoken (">>"); }
1709 | OPERATOR EQUAL
1710 { $$ = operator_stoken ("=="); }
1711 | OPERATOR NOTEQUAL
1712 { $$ = operator_stoken ("!="); }
1713 | OPERATOR LEQ
1714 { $$ = operator_stoken ("<="); }
1715 | OPERATOR GEQ
1716 { $$ = operator_stoken (">="); }
1717 | OPERATOR ANDAND
1718 { $$ = operator_stoken ("&&"); }
1719 | OPERATOR OROR
1720 { $$ = operator_stoken ("||"); }
1721 | OPERATOR INCREMENT
1722 { $$ = operator_stoken ("++"); }
1723 | OPERATOR DECREMENT
1724 { $$ = operator_stoken ("--"); }
1725 | OPERATOR ','
1726 { $$ = operator_stoken (","); }
1727 | OPERATOR ARROW_STAR
1728 { $$ = operator_stoken ("->*"); }
1729 | OPERATOR ARROW
1730 { $$ = operator_stoken ("->"); }
1731 | OPERATOR '(' ')'
1732 { $$ = operator_stoken ("()"); }
1733 | OPERATOR '[' ']'
1734 { $$ = operator_stoken ("[]"); }
1735 | OPERATOR OBJC_LBRAC ']'
1736 { $$ = operator_stoken ("[]"); }
1737 | OPERATOR conversion_type_id
1738 { string_file buf;
1739
1740 c_print_type ($2, NULL, &buf, -1, 0,
1741 &type_print_raw_options);
1742 std::string name = std::move (buf.string ());
1743
1744 /* This also needs canonicalization. */
1745 gdb::unique_xmalloc_ptr<char> canon
1746 = cp_canonicalize_string (name.c_str ());
1747 if (canon != nullptr)
1748 name = canon.get ();
1749 $$ = operator_stoken ((" " + name).c_str ());
1750 }
1751 ;
1752
1753/* This rule exists in order to allow some tokens that would not normally
1754 match the 'name' rule to appear as fields within a struct. The example
1755 that initially motivated this was the RISC-V target which models the
1756 floating point registers as a union with fields called 'float' and
1757 'double'. */
1758field_name
1759 : name
1760 | DOUBLE_KEYWORD { $$ = typename_stoken ("double"); }
1761 | FLOAT_KEYWORD { $$ = typename_stoken ("float"); }
1762 | INT_KEYWORD { $$ = typename_stoken ("int"); }
1763 | LONG { $$ = typename_stoken ("long"); }
1764 | SHORT { $$ = typename_stoken ("short"); }
1765 | SIGNED_KEYWORD { $$ = typename_stoken ("signed"); }
1766 | UNSIGNED { $$ = typename_stoken ("unsigned"); }
1767 ;
1768
1769name : NAME { $$ = $1.stoken; }
1770 | BLOCKNAME { $$ = $1.stoken; }
1771 | TYPENAME { $$ = $1.stoken; }
1772 | NAME_OR_INT { $$ = $1.stoken; }
1773 | UNKNOWN_CPP_NAME { $$ = $1.stoken; }
1774 | oper { $$ = $1; }
1775 ;
1776
1777name_not_typename : NAME
1778 | BLOCKNAME
1779/* These would be useful if name_not_typename was useful, but it is just
1780 a fake for "variable", so these cause reduce/reduce conflicts because
1781 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
1782 =exp) or just an exp. If name_not_typename was ever used in an lvalue
1783 context where only a name could occur, this might be useful.
1784 | NAME_OR_INT
1785 */
1786 | oper
1787 {
1788 struct field_of_this_result is_a_field_of_this;
1789
1790 $$.stoken = $1;
1791 $$.sym
1792 = lookup_symbol ($1.ptr,
1793 pstate->expression_context_block,
1794 VAR_DOMAIN,
1795 &is_a_field_of_this);
1796 $$.is_a_field_of_this
1797 = is_a_field_of_this.type != NULL;
1798 }
1799 | UNKNOWN_CPP_NAME
1800 ;
1801
1802%%
1803
1804/* Like write_exp_string, but prepends a '~'. */
1805
1806static void
1807write_destructor_name (struct parser_state *par_state, struct stoken token)
1808{
1809 char *copy = (char *) alloca (token.length + 1);
1810
1811 copy[0] = '~';
1812 memcpy (&copy[1], token.ptr, token.length);
1813
1814 token.ptr = copy;
1815 ++token.length;
1816
1817 write_exp_string (par_state, token);
1818}
1819
1820/* Returns a stoken of the operator name given by OP (which does not
1821 include the string "operator"). */
1822
1823static struct stoken
1824operator_stoken (const char *op)
1825{
1826 struct stoken st = { NULL, 0 };
1827 char *buf;
1828
1829 st.length = CP_OPERATOR_LEN + strlen (op);
1830 buf = (char *) malloc (st.length + 1);
1831 strcpy (buf, CP_OPERATOR_STR);
1832 strcat (buf, op);
1833 st.ptr = buf;
1834
1835 /* The toplevel (c_parse) will free the memory allocated here. */
1836 cpstate->strings.emplace_back (buf);
1837 return st;
1838};
1839
1840/* Returns a stoken of the type named TYPE. */
1841
1842static struct stoken
1843typename_stoken (const char *type)
1844{
1845 struct stoken st = { type, 0 };
1846 st.length = strlen (type);
1847 return st;
1848};
1849
1850/* Return true if the type is aggregate-like. */
1851
1852static int
1853type_aggregate_p (struct type *type)
1854{
1855 return (type->code () == TYPE_CODE_STRUCT
1856 || type->code () == TYPE_CODE_UNION
1857 || type->code () == TYPE_CODE_NAMESPACE
1858 || (type->code () == TYPE_CODE_ENUM
1859 && TYPE_DECLARED_CLASS (type)));
1860}
1861
1862/* Validate a parameter typelist. */
1863
1864static void
1865check_parameter_typelist (std::vector<struct type *> *params)
1866{
1867 struct type *type;
1868 int ix;
1869
1870 for (ix = 0; ix < params->size (); ++ix)
1871 {
1872 type = (*params)[ix];
1873 if (type != NULL && check_typedef (type)->code () == TYPE_CODE_VOID)
1874 {
1875 if (ix == 0)
1876 {
1877 if (params->size () == 1)
1878 {
1879 /* Ok. */
1880 break;
1881 }
1882 error (_("parameter types following 'void'"));
1883 }
1884 else
1885 error (_("'void' invalid as parameter type"));
1886 }
1887 }
1888}
1889
1890/* Take care of parsing a number (anything that starts with a digit).
1891 Set yylval and return the token type; update lexptr.
1892 LEN is the number of characters in it. */
1893
1894/*** Needs some error checking for the float case ***/
1895
1896static int
1897parse_number (struct parser_state *par_state,
1898 const char *buf, int len, int parsed_float, YYSTYPE *putithere)
1899{
1900 ULONGEST n = 0;
1901 ULONGEST prevn = 0;
1902 ULONGEST un;
1903
1904 int i = 0;
1905 int c;
1906 int base = input_radix;
1907 int unsigned_p = 0;
1908
1909 /* Number of "L" suffixes encountered. */
1910 int long_p = 0;
1911
1912 /* Imaginary number. */
1913 bool imaginary_p = false;
1914
1915 /* We have found a "L" or "U" (or "i") suffix. */
1916 int found_suffix = 0;
1917
1918 ULONGEST high_bit;
1919 struct type *signed_type;
1920 struct type *unsigned_type;
1921 char *p;
1922
1923 p = (char *) alloca (len);
1924 memcpy (p, buf, len);
1925
1926 if (parsed_float)
1927 {
1928 if (len >= 1 && p[len - 1] == 'i')
1929 {
1930 imaginary_p = true;
1931 --len;
1932 }
1933
1934 /* Handle suffixes for decimal floating-point: "df", "dd" or "dl". */
1935 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
1936 {
1937 putithere->typed_val_float.type
1938 = parse_type (par_state)->builtin_decfloat;
1939 len -= 2;
1940 }
1941 else if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
1942 {
1943 putithere->typed_val_float.type
1944 = parse_type (par_state)->builtin_decdouble;
1945 len -= 2;
1946 }
1947 else if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
1948 {
1949 putithere->typed_val_float.type
1950 = parse_type (par_state)->builtin_declong;
1951 len -= 2;
1952 }
1953 /* Handle suffixes: 'f' for float, 'l' for long double. */
1954 else if (len >= 1 && TOLOWER (p[len - 1]) == 'f')
1955 {
1956 putithere->typed_val_float.type
1957 = parse_type (par_state)->builtin_float;
1958 len -= 1;
1959 }
1960 else if (len >= 1 && TOLOWER (p[len - 1]) == 'l')
1961 {
1962 putithere->typed_val_float.type
1963 = parse_type (par_state)->builtin_long_double;
1964 len -= 1;
1965 }
1966 /* Default type for floating-point literals is double. */
1967 else
1968 {
1969 putithere->typed_val_float.type
1970 = parse_type (par_state)->builtin_double;
1971 }
1972
1973 if (!parse_float (p, len,
1974 putithere->typed_val_float.type,
1975 putithere->typed_val_float.val))
1976 return ERROR;
1977
1978 if (imaginary_p)
1979 putithere->typed_val_float.type
1980 = init_complex_type (nullptr, putithere->typed_val_float.type);
1981
1982 return imaginary_p ? COMPLEX_FLOAT : FLOAT;
1983 }
1984
1985 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1986 if (p[0] == '0' && len > 1)
1987 switch (p[1])
1988 {
1989 case 'x':
1990 case 'X':
1991 if (len >= 3)
1992 {
1993 p += 2;
1994 base = 16;
1995 len -= 2;
1996 }
1997 break;
1998
1999 case 'b':
2000 case 'B':
2001 if (len >= 3)
2002 {
2003 p += 2;
2004 base = 2;
2005 len -= 2;
2006 }
2007 break;
2008
2009 case 't':
2010 case 'T':
2011 case 'd':
2012 case 'D':
2013 if (len >= 3)
2014 {
2015 p += 2;
2016 base = 10;
2017 len -= 2;
2018 }
2019 break;
2020
2021 default:
2022 base = 8;
2023 break;
2024 }
2025
2026 while (len-- > 0)
2027 {
2028 c = *p++;
2029 if (c >= 'A' && c <= 'Z')
2030 c += 'a' - 'A';
2031 if (c != 'l' && c != 'u' && c != 'i')
2032 n *= base;
2033 if (c >= '0' && c <= '9')
2034 {
2035 if (found_suffix)
2036 return ERROR;
2037 n += i = c - '0';
2038 }
2039 else
2040 {
2041 if (base > 10 && c >= 'a' && c <= 'f')
2042 {
2043 if (found_suffix)
2044 return ERROR;
2045 n += i = c - 'a' + 10;
2046 }
2047 else if (c == 'l')
2048 {
2049 ++long_p;
2050 found_suffix = 1;
2051 }
2052 else if (c == 'u')
2053 {
2054 unsigned_p = 1;
2055 found_suffix = 1;
2056 }
2057 else if (c == 'i')
2058 {
2059 imaginary_p = true;
2060 found_suffix = 1;
2061 }
2062 else
2063 return ERROR; /* Char not a digit */
2064 }
2065 if (i >= base)
2066 return ERROR; /* Invalid digit in this base */
2067
2068 /* Portably test for overflow (only works for nonzero values, so make
2069 a second check for zero). FIXME: Can't we just make n and prevn
2070 unsigned and avoid this? */
2071 if (c != 'l' && c != 'u' && c != 'i' && (prevn >= n) && n != 0)
2072 unsigned_p = 1; /* Try something unsigned */
2073
2074 /* Portably test for unsigned overflow.
2075 FIXME: This check is wrong; for example it doesn't find overflow
2076 on 0x123456789 when LONGEST is 32 bits. */
2077 if (c != 'l' && c != 'u' && c != 'i' && n != 0)
2078 {
2079 if (unsigned_p && prevn >= n)
2080 error (_("Numeric constant too large."));
2081 }
2082 prevn = n;
2083 }
2084
2085 /* An integer constant is an int, a long, or a long long. An L
2086 suffix forces it to be long; an LL suffix forces it to be long
2087 long. If not forced to a larger size, it gets the first type of
2088 the above that it fits in. To figure out whether it fits, we
2089 shift it right and see whether anything remains. Note that we
2090 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
2091 operation, because many compilers will warn about such a shift
2092 (which always produces a zero result). Sometimes gdbarch_int_bit
2093 or gdbarch_long_bit will be that big, sometimes not. To deal with
2094 the case where it is we just always shift the value more than
2095 once, with fewer bits each time. */
2096
2097 un = n >> 2;
2098 if (long_p == 0
2099 && (un >> (gdbarch_int_bit (par_state->gdbarch ()) - 2)) == 0)
2100 {
2101 high_bit
2102 = ((ULONGEST)1) << (gdbarch_int_bit (par_state->gdbarch ()) - 1);
2103
2104 /* A large decimal (not hex or octal) constant (between INT_MAX
2105 and UINT_MAX) is a long or unsigned long, according to ANSI,
2106 never an unsigned int, but this code treats it as unsigned
2107 int. This probably should be fixed. GCC gives a warning on
2108 such constants. */
2109
2110 unsigned_type = parse_type (par_state)->builtin_unsigned_int;
2111 signed_type = parse_type (par_state)->builtin_int;
2112 }
2113 else if (long_p <= 1
2114 && (un >> (gdbarch_long_bit (par_state->gdbarch ()) - 2)) == 0)
2115 {
2116 high_bit
2117 = ((ULONGEST)1) << (gdbarch_long_bit (par_state->gdbarch ()) - 1);
2118 unsigned_type = parse_type (par_state)->builtin_unsigned_long;
2119 signed_type = parse_type (par_state)->builtin_long;
2120 }
2121 else
2122 {
2123 int shift;
2124 if (sizeof (ULONGEST) * HOST_CHAR_BIT
2125 < gdbarch_long_long_bit (par_state->gdbarch ()))
2126 /* A long long does not fit in a LONGEST. */
2127 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
2128 else
2129 shift = (gdbarch_long_long_bit (par_state->gdbarch ()) - 1);
2130 high_bit = (ULONGEST) 1 << shift;
2131 unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
2132 signed_type = parse_type (par_state)->builtin_long_long;
2133 }
2134
2135 putithere->typed_val_int.val = n;
2136
2137 /* If the high bit of the worked out type is set then this number
2138 has to be unsigned. */
2139
2140 if (unsigned_p || (n & high_bit))
2141 {
2142 putithere->typed_val_int.type = unsigned_type;
2143 }
2144 else
2145 {
2146 putithere->typed_val_int.type = signed_type;
2147 }
2148
2149 if (imaginary_p)
2150 putithere->typed_val_int.type
2151 = init_complex_type (nullptr, putithere->typed_val_int.type);
2152
2153 return imaginary_p ? COMPLEX_INT : INT;
2154}
2155
2156/* Temporary obstack used for holding strings. */
2157static struct obstack tempbuf;
2158static int tempbuf_init;
2159
2160/* Parse a C escape sequence. The initial backslash of the sequence
2161 is at (*PTR)[-1]. *PTR will be updated to point to just after the
2162 last character of the sequence. If OUTPUT is not NULL, the
2163 translated form of the escape sequence will be written there. If
2164 OUTPUT is NULL, no output is written and the call will only affect
2165 *PTR. If an escape sequence is expressed in target bytes, then the
2166 entire sequence will simply be copied to OUTPUT. Return 1 if any
2167 character was emitted, 0 otherwise. */
2168
2169int
2170c_parse_escape (const char **ptr, struct obstack *output)
2171{
2172 const char *tokptr = *ptr;
2173 int result = 1;
2174
2175 /* Some escape sequences undergo character set conversion. Those we
2176 translate here. */
2177 switch (*tokptr)
2178 {
2179 /* Hex escapes do not undergo character set conversion, so keep
2180 the escape sequence for later. */
2181 case 'x':
2182 if (output)
2183 obstack_grow_str (output, "\\x");
2184 ++tokptr;
2185 if (!ISXDIGIT (*tokptr))
2186 error (_("\\x escape without a following hex digit"));
2187 while (ISXDIGIT (*tokptr))
2188 {
2189 if (output)
2190 obstack_1grow (output, *tokptr);
2191 ++tokptr;
2192 }
2193 break;
2194
2195 /* Octal escapes do not undergo character set conversion, so
2196 keep the escape sequence for later. */
2197 case '0':
2198 case '1':
2199 case '2':
2200 case '3':
2201 case '4':
2202 case '5':
2203 case '6':
2204 case '7':
2205 {
2206 int i;
2207 if (output)
2208 obstack_grow_str (output, "\\");
2209 for (i = 0;
2210 i < 3 && ISDIGIT (*tokptr) && *tokptr != '8' && *tokptr != '9';
2211 ++i)
2212 {
2213 if (output)
2214 obstack_1grow (output, *tokptr);
2215 ++tokptr;
2216 }
2217 }
2218 break;
2219
2220 /* We handle UCNs later. We could handle them here, but that
2221 would mean a spurious error in the case where the UCN could
2222 be converted to the target charset but not the host
2223 charset. */
2224 case 'u':
2225 case 'U':
2226 {
2227 char c = *tokptr;
2228 int i, len = c == 'U' ? 8 : 4;
2229 if (output)
2230 {
2231 obstack_1grow (output, '\\');
2232 obstack_1grow (output, *tokptr);
2233 }
2234 ++tokptr;
2235 if (!ISXDIGIT (*tokptr))
2236 error (_("\\%c escape without a following hex digit"), c);
2237 for (i = 0; i < len && ISXDIGIT (*tokptr); ++i)
2238 {
2239 if (output)
2240 obstack_1grow (output, *tokptr);
2241 ++tokptr;
2242 }
2243 }
2244 break;
2245
2246 /* We must pass backslash through so that it does not
2247 cause quoting during the second expansion. */
2248 case '\\':
2249 if (output)
2250 obstack_grow_str (output, "\\\\");
2251 ++tokptr;
2252 break;
2253
2254 /* Escapes which undergo conversion. */
2255 case 'a':
2256 if (output)
2257 obstack_1grow (output, '\a');
2258 ++tokptr;
2259 break;
2260 case 'b':
2261 if (output)
2262 obstack_1grow (output, '\b');
2263 ++tokptr;
2264 break;
2265 case 'f':
2266 if (output)
2267 obstack_1grow (output, '\f');
2268 ++tokptr;
2269 break;
2270 case 'n':
2271 if (output)
2272 obstack_1grow (output, '\n');
2273 ++tokptr;
2274 break;
2275 case 'r':
2276 if (output)
2277 obstack_1grow (output, '\r');
2278 ++tokptr;
2279 break;
2280 case 't':
2281 if (output)
2282 obstack_1grow (output, '\t');
2283 ++tokptr;
2284 break;
2285 case 'v':
2286 if (output)
2287 obstack_1grow (output, '\v');
2288 ++tokptr;
2289 break;
2290
2291 /* GCC extension. */
2292 case 'e':
2293 if (output)
2294 obstack_1grow (output, HOST_ESCAPE_CHAR);
2295 ++tokptr;
2296 break;
2297
2298 /* Backslash-newline expands to nothing at all. */
2299 case '\n':
2300 ++tokptr;
2301 result = 0;
2302 break;
2303
2304 /* A few escapes just expand to the character itself. */
2305 case '\'':
2306 case '\"':
2307 case '?':
2308 /* GCC extensions. */
2309 case '(':
2310 case '{':
2311 case '[':
2312 case '%':
2313 /* Unrecognized escapes turn into the character itself. */
2314 default:
2315 if (output)
2316 obstack_1grow (output, *tokptr);
2317 ++tokptr;
2318 break;
2319 }
2320 *ptr = tokptr;
2321 return result;
2322}
2323
2324/* Parse a string or character literal from TOKPTR. The string or
2325 character may be wide or unicode. *OUTPTR is set to just after the
2326 end of the literal in the input string. The resulting token is
2327 stored in VALUE. This returns a token value, either STRING or
2328 CHAR, depending on what was parsed. *HOST_CHARS is set to the
2329 number of host characters in the literal. */
2330
2331static int
2332parse_string_or_char (const char *tokptr, const char **outptr,
2333 struct typed_stoken *value, int *host_chars)
2334{
2335 int quote;
2336 c_string_type type;
2337 int is_objc = 0;
2338
2339 /* Build the gdb internal form of the input string in tempbuf. Note
2340 that the buffer is null byte terminated *only* for the
2341 convenience of debugging gdb itself and printing the buffer
2342 contents when the buffer contains no embedded nulls. Gdb does
2343 not depend upon the buffer being null byte terminated, it uses
2344 the length string instead. This allows gdb to handle C strings
2345 (as well as strings in other languages) with embedded null
2346 bytes */
2347
2348 if (!tempbuf_init)
2349 tempbuf_init = 1;
2350 else
2351 obstack_free (&tempbuf, NULL);
2352 obstack_init (&tempbuf);
2353
2354 /* Record the string type. */
2355 if (*tokptr == 'L')
2356 {
2357 type = C_WIDE_STRING;
2358 ++tokptr;
2359 }
2360 else if (*tokptr == 'u')
2361 {
2362 type = C_STRING_16;
2363 ++tokptr;
2364 }
2365 else if (*tokptr == 'U')
2366 {
2367 type = C_STRING_32;
2368 ++tokptr;
2369 }
2370 else if (*tokptr == '@')
2371 {
2372 /* An Objective C string. */
2373 is_objc = 1;
2374 type = C_STRING;
2375 ++tokptr;
2376 }
2377 else
2378 type = C_STRING;
2379
2380 /* Skip the quote. */
2381 quote = *tokptr;
2382 if (quote == '\'')
2383 type |= C_CHAR;
2384 ++tokptr;
2385
2386 *host_chars = 0;
2387
2388 while (*tokptr)
2389 {
2390 char c = *tokptr;
2391 if (c == '\\')
2392 {
2393 ++tokptr;
2394 *host_chars += c_parse_escape (&tokptr, &tempbuf);
2395 }
2396 else if (c == quote)
2397 break;
2398 else
2399 {
2400 obstack_1grow (&tempbuf, c);
2401 ++tokptr;
2402 /* FIXME: this does the wrong thing with multi-byte host
2403 characters. We could use mbrlen here, but that would
2404 make "set host-charset" a bit less useful. */
2405 ++*host_chars;
2406 }
2407 }
2408
2409 if (*tokptr != quote)
2410 {
2411 if (quote == '"')
2412 error (_("Unterminated string in expression."));
2413 else
2414 error (_("Unmatched single quote."));
2415 }
2416 ++tokptr;
2417
2418 value->type = type;
2419 value->ptr = (char *) obstack_base (&tempbuf);
2420 value->length = obstack_object_size (&tempbuf);
2421
2422 *outptr = tokptr;
2423
2424 return quote == '"' ? (is_objc ? NSSTRING : STRING) : CHAR;
2425}
2426
2427/* This is used to associate some attributes with a token. */
2428
2429enum token_flag
2430{
2431 /* If this bit is set, the token is C++-only. */
2432
2433 FLAG_CXX = 1,
2434
2435 /* If this bit is set, the token is C-only. */
2436
2437 FLAG_C = 2,
2438
2439 /* If this bit is set, the token is conditional: if there is a
2440 symbol of the same name, then the token is a symbol; otherwise,
2441 the token is a keyword. */
2442
2443 FLAG_SHADOW = 4
2444};
2445DEF_ENUM_FLAGS_TYPE (enum token_flag, token_flags);
2446
2447struct token
2448{
2449 const char *oper;
2450 int token;
2451 enum exp_opcode opcode;
2452 token_flags flags;
2453};
2454
2455static const struct token tokentab3[] =
2456 {
2457 {">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
2458 {"<<=", ASSIGN_MODIFY, BINOP_LSH, 0},
2459 {"->*", ARROW_STAR, BINOP_END, FLAG_CXX},
2460 {"...", DOTDOTDOT, BINOP_END, 0}
2461 };
2462
2463static const struct token tokentab2[] =
2464 {
2465 {"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
2466 {"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
2467 {"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
2468 {"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
2469 {"%=", ASSIGN_MODIFY, BINOP_REM, 0},
2470 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
2471 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
2472 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
2473 {"++", INCREMENT, BINOP_END, 0},
2474 {"--", DECREMENT, BINOP_END, 0},
2475 {"->", ARROW, BINOP_END, 0},
2476 {"&&", ANDAND, BINOP_END, 0},
2477 {"||", OROR, BINOP_END, 0},
2478 /* "::" is *not* only C++: gdb overrides its meaning in several
2479 different ways, e.g., 'filename'::func, function::variable. */
2480 {"::", COLONCOLON, BINOP_END, 0},
2481 {"<<", LSH, BINOP_END, 0},
2482 {">>", RSH, BINOP_END, 0},
2483 {"==", EQUAL, BINOP_END, 0},
2484 {"!=", NOTEQUAL, BINOP_END, 0},
2485 {"<=", LEQ, BINOP_END, 0},
2486 {">=", GEQ, BINOP_END, 0},
2487 {".*", DOT_STAR, BINOP_END, FLAG_CXX}
2488 };
2489
2490/* Identifier-like tokens. Only type-specifiers than can appear in
2491 multi-word type names (for example 'double' can appear in 'long
2492 double') need to be listed here. type-specifiers that are only ever
2493 single word (like 'char') are handled by the classify_name function. */
2494static const struct token ident_tokens[] =
2495 {
2496 {"unsigned", UNSIGNED, OP_NULL, 0},
2497 {"template", TEMPLATE, OP_NULL, FLAG_CXX},
2498 {"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
2499 {"struct", STRUCT, OP_NULL, 0},
2500 {"signed", SIGNED_KEYWORD, OP_NULL, 0},
2501 {"sizeof", SIZEOF, OP_NULL, 0},
2502 {"_Alignof", ALIGNOF, OP_NULL, 0},
2503 {"alignof", ALIGNOF, OP_NULL, FLAG_CXX},
2504 {"double", DOUBLE_KEYWORD, OP_NULL, 0},
2505 {"float", FLOAT_KEYWORD, OP_NULL, 0},
2506 {"false", FALSEKEYWORD, OP_NULL, FLAG_CXX},
2507 {"class", CLASS, OP_NULL, FLAG_CXX},
2508 {"union", UNION, OP_NULL, 0},
2509 {"short", SHORT, OP_NULL, 0},
2510 {"const", CONST_KEYWORD, OP_NULL, 0},
2511 {"restrict", RESTRICT, OP_NULL, FLAG_C | FLAG_SHADOW},
2512 {"__restrict__", RESTRICT, OP_NULL, 0},
2513 {"__restrict", RESTRICT, OP_NULL, 0},
2514 {"_Atomic", ATOMIC, OP_NULL, 0},
2515 {"enum", ENUM, OP_NULL, 0},
2516 {"long", LONG, OP_NULL, 0},
2517 {"_Complex", COMPLEX, OP_NULL, 0},
2518 {"__complex__", COMPLEX, OP_NULL, 0},
2519
2520 {"true", TRUEKEYWORD, OP_NULL, FLAG_CXX},
2521 {"int", INT_KEYWORD, OP_NULL, 0},
2522 {"new", NEW, OP_NULL, FLAG_CXX},
2523 {"delete", DELETE, OP_NULL, FLAG_CXX},
2524 {"operator", OPERATOR, OP_NULL, FLAG_CXX},
2525
2526 {"and", ANDAND, BINOP_END, FLAG_CXX},
2527 {"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, FLAG_CXX},
2528 {"bitand", '&', OP_NULL, FLAG_CXX},
2529 {"bitor", '|', OP_NULL, FLAG_CXX},
2530 {"compl", '~', OP_NULL, FLAG_CXX},
2531 {"not", '!', OP_NULL, FLAG_CXX},
2532 {"not_eq", NOTEQUAL, BINOP_END, FLAG_CXX},
2533 {"or", OROR, BINOP_END, FLAG_CXX},
2534 {"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, FLAG_CXX},
2535 {"xor", '^', OP_NULL, FLAG_CXX},
2536 {"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, FLAG_CXX},
2537
2538 {"const_cast", CONST_CAST, OP_NULL, FLAG_CXX },
2539 {"dynamic_cast", DYNAMIC_CAST, OP_NULL, FLAG_CXX },
2540 {"static_cast", STATIC_CAST, OP_NULL, FLAG_CXX },
2541 {"reinterpret_cast", REINTERPRET_CAST, OP_NULL, FLAG_CXX },
2542
2543 {"__typeof__", TYPEOF, OP_TYPEOF, 0 },
2544 {"__typeof", TYPEOF, OP_TYPEOF, 0 },
2545 {"typeof", TYPEOF, OP_TYPEOF, FLAG_SHADOW },
2546 {"__decltype", DECLTYPE, OP_DECLTYPE, FLAG_CXX },
2547 {"decltype", DECLTYPE, OP_DECLTYPE, FLAG_CXX | FLAG_SHADOW },
2548
2549 {"typeid", TYPEID, OP_TYPEID, FLAG_CXX}
2550 };
2551
2552
2553static void
2554scan_macro_expansion (const char *expansion)
2555{
2556 /* We'd better not be trying to push the stack twice. */
2557 gdb_assert (! cpstate->macro_original_text);
2558
2559 /* Copy to the obstack. */
2560 const char *copy = obstack_strdup (&cpstate->expansion_obstack, expansion);
2561
2562 /* Save the old lexptr value, so we can return to it when we're done
2563 parsing the expanded text. */
2564 cpstate->macro_original_text = pstate->lexptr;
2565 pstate->lexptr = copy;
2566}
2567
2568static int
2569scanning_macro_expansion (void)
2570{
2571 return cpstate->macro_original_text != 0;
2572}
2573
2574static void
2575finished_macro_expansion (void)
2576{
2577 /* There'd better be something to pop back to. */
2578 gdb_assert (cpstate->macro_original_text);
2579
2580 /* Pop back to the original text. */
2581 pstate->lexptr = cpstate->macro_original_text;
2582 cpstate->macro_original_text = 0;
2583}
2584
2585/* Return true iff the token represents a C++ cast operator. */
2586
2587static int
2588is_cast_operator (const char *token, int len)
2589{
2590 return (! strncmp (token, "dynamic_cast", len)
2591 || ! strncmp (token, "static_cast", len)
2592 || ! strncmp (token, "reinterpret_cast", len)
2593 || ! strncmp (token, "const_cast", len));
2594}
2595
2596/* The scope used for macro expansion. */
2597static struct macro_scope *expression_macro_scope;
2598
2599/* This is set if a NAME token appeared at the very end of the input
2600 string, with no whitespace separating the name from the EOF. This
2601 is used only when parsing to do field name completion. */
2602static int saw_name_at_eof;
2603
2604/* This is set if the previously-returned token was a structure
2605 operator -- either '.' or ARROW. */
2606static bool last_was_structop;
2607
2608/* Depth of parentheses. */
2609static int paren_depth;
2610
2611/* Read one token, getting characters through lexptr. */
2612
2613static int
2614lex_one_token (struct parser_state *par_state, bool *is_quoted_name)
2615{
2616 int c;
2617 int namelen;
2618 unsigned int i;
2619 const char *tokstart;
2620 bool saw_structop = last_was_structop;
2621
2622 last_was_structop = false;
2623 *is_quoted_name = false;
2624
2625 retry:
2626
2627 /* Check if this is a macro invocation that we need to expand. */
2628 if (! scanning_macro_expansion ())
2629 {
2630 gdb::unique_xmalloc_ptr<char> expanded
2631 = macro_expand_next (&pstate->lexptr, *expression_macro_scope);
2632
2633 if (expanded != nullptr)
2634 scan_macro_expansion (expanded.get ());
2635 }
2636
2637 pstate->prev_lexptr = pstate->lexptr;
2638
2639 tokstart = pstate->lexptr;
2640 /* See if it is a special token of length 3. */
2641 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
2642 if (strncmp (tokstart, tokentab3[i].oper, 3) == 0)
2643 {
2644 if ((tokentab3[i].flags & FLAG_CXX) != 0
2645 && par_state->language ()->la_language != language_cplus)
2646 break;
2647 gdb_assert ((tokentab3[i].flags & FLAG_C) == 0);
2648
2649 pstate->lexptr += 3;
2650 yylval.opcode = tokentab3[i].opcode;
2651 return tokentab3[i].token;
2652 }
2653
2654 /* See if it is a special token of length 2. */
2655 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
2656 if (strncmp (tokstart, tokentab2[i].oper, 2) == 0)
2657 {
2658 if ((tokentab2[i].flags & FLAG_CXX) != 0
2659 && par_state->language ()->la_language != language_cplus)
2660 break;
2661 gdb_assert ((tokentab2[i].flags & FLAG_C) == 0);
2662
2663 pstate->lexptr += 2;
2664 yylval.opcode = tokentab2[i].opcode;
2665 if (tokentab2[i].token == ARROW)
2666 last_was_structop = 1;
2667 return tokentab2[i].token;
2668 }
2669
2670 switch (c = *tokstart)
2671 {
2672 case 0:
2673 /* If we were just scanning the result of a macro expansion,
2674 then we need to resume scanning the original text.
2675 If we're parsing for field name completion, and the previous
2676 token allows such completion, return a COMPLETE token.
2677 Otherwise, we were already scanning the original text, and
2678 we're really done. */
2679 if (scanning_macro_expansion ())
2680 {
2681 finished_macro_expansion ();
2682 goto retry;
2683 }
2684 else if (saw_name_at_eof)
2685 {
2686 saw_name_at_eof = 0;
2687 return COMPLETE;
2688 }
2689 else if (par_state->parse_completion && saw_structop)
2690 return COMPLETE;
2691 else
2692 return 0;
2693
2694 case ' ':
2695 case '\t':
2696 case '\n':
2697 pstate->lexptr++;
2698 goto retry;
2699
2700 case '[':
2701 case '(':
2702 paren_depth++;
2703 pstate->lexptr++;
2704 if (par_state->language ()->la_language == language_objc
2705 && c == '[')
2706 return OBJC_LBRAC;
2707 return c;
2708
2709 case ']':
2710 case ')':
2711 if (paren_depth == 0)
2712 return 0;
2713 paren_depth--;
2714 pstate->lexptr++;
2715 return c;
2716
2717 case ',':
2718 if (pstate->comma_terminates
2719 && paren_depth == 0
2720 && ! scanning_macro_expansion ())
2721 return 0;
2722 pstate->lexptr++;
2723 return c;
2724
2725 case '.':
2726 /* Might be a floating point number. */
2727 if (pstate->lexptr[1] < '0' || pstate->lexptr[1] > '9')
2728 {
2729 last_was_structop = true;
2730 goto symbol; /* Nope, must be a symbol. */
2731 }
2732 /* FALL THRU. */
2733
2734 case '0':
2735 case '1':
2736 case '2':
2737 case '3':
2738 case '4':
2739 case '5':
2740 case '6':
2741 case '7':
2742 case '8':
2743 case '9':
2744 {
2745 /* It's a number. */
2746 int got_dot = 0, got_e = 0, got_p = 0, toktype;
2747 const char *p = tokstart;
2748 int hex = input_radix > 10;
2749
2750 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
2751 {
2752 p += 2;
2753 hex = 1;
2754 }
2755 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
2756 {
2757 p += 2;
2758 hex = 0;
2759 }
2760
2761 for (;; ++p)
2762 {
2763 /* This test includes !hex because 'e' is a valid hex digit
2764 and thus does not indicate a floating point number when
2765 the radix is hex. */
2766 if (!hex && !got_e && !got_p && (*p == 'e' || *p == 'E'))
2767 got_dot = got_e = 1;
2768 else if (!got_e && !got_p && (*p == 'p' || *p == 'P'))
2769 got_dot = got_p = 1;
2770 /* This test does not include !hex, because a '.' always indicates
2771 a decimal floating point number regardless of the radix. */
2772 else if (!got_dot && *p == '.')
2773 got_dot = 1;
2774 else if (((got_e && (p[-1] == 'e' || p[-1] == 'E'))
2775 || (got_p && (p[-1] == 'p' || p[-1] == 'P')))
2776 && (*p == '-' || *p == '+'))
2777 /* This is the sign of the exponent, not the end of the
2778 number. */
2779 continue;
2780 /* We will take any letters or digits. parse_number will
2781 complain if past the radix, or if L or U are not final. */
2782 else if ((*p < '0' || *p > '9')
2783 && ((*p < 'a' || *p > 'z')
2784 && (*p < 'A' || *p > 'Z')))
2785 break;
2786 }
2787 toktype = parse_number (par_state, tokstart, p - tokstart,
2788 got_dot | got_e | got_p, &yylval);
2789 if (toktype == ERROR)
2790 {
2791 char *err_copy = (char *) alloca (p - tokstart + 1);
2792
2793 memcpy (err_copy, tokstart, p - tokstart);
2794 err_copy[p - tokstart] = 0;
2795 error (_("Invalid number \"%s\"."), err_copy);
2796 }
2797 pstate->lexptr = p;
2798 return toktype;
2799 }
2800
2801 case '@':
2802 {
2803 const char *p = &tokstart[1];
2804
2805 if (par_state->language ()->la_language == language_objc)
2806 {
2807 size_t len = strlen ("selector");
2808
2809 if (strncmp (p, "selector", len) == 0
2810 && (p[len] == '\0' || ISSPACE (p[len])))
2811 {
2812 pstate->lexptr = p + len;
2813 return SELECTOR;
2814 }
2815 else if (*p == '"')
2816 goto parse_string;
2817 }
2818
2819 while (ISSPACE (*p))
2820 p++;
2821 size_t len = strlen ("entry");
2822 if (strncmp (p, "entry", len) == 0 && !c_ident_is_alnum (p[len])
2823 && p[len] != '_')
2824 {
2825 pstate->lexptr = &p[len];
2826 return ENTRY;
2827 }
2828 }
2829 /* FALLTHRU */
2830 case '+':
2831 case '-':
2832 case '*':
2833 case '/':
2834 case '%':
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 symbol:
2848 pstate->lexptr++;
2849 return c;
2850
2851 case 'L':
2852 case 'u':
2853 case 'U':
2854 if (tokstart[1] != '"' && tokstart[1] != '\'')
2855 break;
2856 /* Fall through. */
2857 case '\'':
2858 case '"':
2859
2860 parse_string:
2861 {
2862 int host_len;
2863 int result = parse_string_or_char (tokstart, &pstate->lexptr,
2864 &yylval.tsval, &host_len);
2865 if (result == CHAR)
2866 {
2867 if (host_len == 0)
2868 error (_("Empty character constant."));
2869 else if (host_len > 2 && c == '\'')
2870 {
2871 ++tokstart;
2872 namelen = pstate->lexptr - tokstart - 1;
2873 *is_quoted_name = true;
2874
2875 goto tryname;
2876 }
2877 else if (host_len > 1)
2878 error (_("Invalid character constant."));
2879 }
2880 return result;
2881 }
2882 }
2883
2884 if (!(c == '_' || c == '$' || c_ident_is_alpha (c)))
2885 /* We must have come across a bad character (e.g. ';'). */
2886 error (_("Invalid character '%c' in expression."), c);
2887
2888 /* It's a name. See how long it is. */
2889 namelen = 0;
2890 for (c = tokstart[namelen];
2891 (c == '_' || c == '$' || c_ident_is_alnum (c) || c == '<');)
2892 {
2893 /* Template parameter lists are part of the name.
2894 FIXME: This mishandles `print $a<4&&$a>3'. */
2895
2896 if (c == '<')
2897 {
2898 if (! is_cast_operator (tokstart, namelen))
2899 {
2900 /* Scan ahead to get rest of the template specification. Note
2901 that we look ahead only when the '<' adjoins non-whitespace
2902 characters; for comparison expressions, e.g. "a < b > c",
2903 there must be spaces before the '<', etc. */
2904 const char *p = find_template_name_end (tokstart + namelen);
2905
2906 if (p)
2907 namelen = p - tokstart;
2908 }
2909 break;
2910 }
2911 c = tokstart[++namelen];
2912 }
2913
2914 /* The token "if" terminates the expression and is NOT removed from
2915 the input stream. It doesn't count if it appears in the
2916 expansion of a macro. */
2917 if (namelen == 2
2918 && tokstart[0] == 'i'
2919 && tokstart[1] == 'f'
2920 && ! scanning_macro_expansion ())
2921 {
2922 return 0;
2923 }
2924
2925 /* For the same reason (breakpoint conditions), "thread N"
2926 terminates the expression. "thread" could be an identifier, but
2927 an identifier is never followed by a number without intervening
2928 punctuation. "task" is similar. Handle abbreviations of these,
2929 similarly to breakpoint.c:find_condition_and_thread. */
2930 if (namelen >= 1
2931 && (strncmp (tokstart, "thread", namelen) == 0
2932 || strncmp (tokstart, "task", namelen) == 0)
2933 && (tokstart[namelen] == ' ' || tokstart[namelen] == '\t')
2934 && ! scanning_macro_expansion ())
2935 {
2936 const char *p = tokstart + namelen + 1;
2937
2938 while (*p == ' ' || *p == '\t')
2939 p++;
2940 if (*p >= '0' && *p <= '9')
2941 return 0;
2942 }
2943
2944 pstate->lexptr += namelen;
2945
2946 tryname:
2947
2948 yylval.sval.ptr = tokstart;
2949 yylval.sval.length = namelen;
2950
2951 /* Catch specific keywords. */
2952 std::string copy = copy_name (yylval.sval);
2953 for (i = 0; i < sizeof ident_tokens / sizeof ident_tokens[0]; i++)
2954 if (copy == ident_tokens[i].oper)
2955 {
2956 if ((ident_tokens[i].flags & FLAG_CXX) != 0
2957 && par_state->language ()->la_language != language_cplus)
2958 break;
2959 if ((ident_tokens[i].flags & FLAG_C) != 0
2960 && par_state->language ()->la_language != language_c
2961 && par_state->language ()->la_language != language_objc)
2962 break;
2963
2964 if ((ident_tokens[i].flags & FLAG_SHADOW) != 0)
2965 {
2966 struct field_of_this_result is_a_field_of_this;
2967
2968 if (lookup_symbol (copy.c_str (),
2969 pstate->expression_context_block,
2970 VAR_DOMAIN,
2971 (par_state->language ()->la_language
2972 == language_cplus ? &is_a_field_of_this
2973 : NULL)).symbol
2974 != NULL)
2975 {
2976 /* The keyword is shadowed. */
2977 break;
2978 }
2979 }
2980
2981 /* It is ok to always set this, even though we don't always
2982 strictly need to. */
2983 yylval.opcode = ident_tokens[i].opcode;
2984 return ident_tokens[i].token;
2985 }
2986
2987 if (*tokstart == '$')
2988 return DOLLAR_VARIABLE;
2989
2990 if (pstate->parse_completion && *pstate->lexptr == '\0')
2991 saw_name_at_eof = 1;
2992
2993 yylval.ssym.stoken = yylval.sval;
2994 yylval.ssym.sym.symbol = NULL;
2995 yylval.ssym.sym.block = NULL;
2996 yylval.ssym.is_a_field_of_this = 0;
2997 return NAME;
2998}
2999
3000/* An object of this type is pushed on a FIFO by the "outer" lexer. */
3001struct token_and_value
3002{
3003 int token;
3004 YYSTYPE value;
3005};
3006
3007/* A FIFO of tokens that have been read but not yet returned to the
3008 parser. */
3009static std::vector<token_and_value> token_fifo;
3010
3011/* Non-zero if the lexer should return tokens from the FIFO. */
3012static int popping;
3013
3014/* Temporary storage for c_lex; this holds symbol names as they are
3015 built up. */
3016auto_obstack name_obstack;
3017
3018/* Classify a NAME token. The contents of the token are in `yylval'.
3019 Updates yylval and returns the new token type. BLOCK is the block
3020 in which lookups start; this can be NULL to mean the global scope.
3021 IS_QUOTED_NAME is non-zero if the name token was originally quoted
3022 in single quotes. IS_AFTER_STRUCTOP is true if this name follows
3023 a structure operator -- either '.' or ARROW */
3024
3025static int
3026classify_name (struct parser_state *par_state, const struct block *block,
3027 bool is_quoted_name, bool is_after_structop)
3028{
3029 struct block_symbol bsym;
3030 struct field_of_this_result is_a_field_of_this;
3031
3032 std::string copy = copy_name (yylval.sval);
3033
3034 /* Initialize this in case we *don't* use it in this call; that way
3035 we can refer to it unconditionally below. */
3036 memset (&is_a_field_of_this, 0, sizeof (is_a_field_of_this));
3037
3038 bsym = lookup_symbol (copy.c_str (), block, VAR_DOMAIN,
3039 par_state->language ()->la_name_of_this
3040 ? &is_a_field_of_this : NULL);
3041
3042 if (bsym.symbol && SYMBOL_CLASS (bsym.symbol) == LOC_BLOCK)
3043 {
3044 yylval.ssym.sym = bsym;
3045 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
3046 return BLOCKNAME;
3047 }
3048 else if (!bsym.symbol)
3049 {
3050 /* If we found a field of 'this', we might have erroneously
3051 found a constructor where we wanted a type name. Handle this
3052 case by noticing that we found a constructor and then look up
3053 the type tag instead. */
3054 if (is_a_field_of_this.type != NULL
3055 && is_a_field_of_this.fn_field != NULL
3056 && TYPE_FN_FIELD_CONSTRUCTOR (is_a_field_of_this.fn_field->fn_fields,
3057 0))
3058 {
3059 struct field_of_this_result inner_is_a_field_of_this;
3060
3061 bsym = lookup_symbol (copy.c_str (), block, STRUCT_DOMAIN,
3062 &inner_is_a_field_of_this);
3063 if (bsym.symbol != NULL)
3064 {
3065 yylval.tsym.type = SYMBOL_TYPE (bsym.symbol);
3066 return TYPENAME;
3067 }
3068 }
3069
3070 /* If we found a field on the "this" object, or we are looking
3071 up a field on a struct, then we want to prefer it over a
3072 filename. However, if the name was quoted, then it is better
3073 to check for a filename or a block, since this is the only
3074 way the user has of requiring the extension to be used. */
3075 if ((is_a_field_of_this.type == NULL && !is_after_structop)
3076 || is_quoted_name)
3077 {
3078 /* See if it's a file name. */
3079 struct symtab *symtab;
3080
3081 symtab = lookup_symtab (copy.c_str ());
3082 if (symtab)
3083 {
3084 yylval.bval = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (symtab),
3085 STATIC_BLOCK);
3086 return FILENAME;
3087 }
3088 }
3089 }
3090
3091 if (bsym.symbol && SYMBOL_CLASS (bsym.symbol) == LOC_TYPEDEF)
3092 {
3093 yylval.tsym.type = SYMBOL_TYPE (bsym.symbol);
3094 return TYPENAME;
3095 }
3096
3097 /* See if it's an ObjC classname. */
3098 if (par_state->language ()->la_language == language_objc && !bsym.symbol)
3099 {
3100 CORE_ADDR Class = lookup_objc_class (par_state->gdbarch (),
3101 copy.c_str ());
3102 if (Class)
3103 {
3104 struct symbol *sym;
3105
3106 yylval.theclass.theclass = Class;
3107 sym = lookup_struct_typedef (copy.c_str (),
3108 par_state->expression_context_block, 1);
3109 if (sym)
3110 yylval.theclass.type = SYMBOL_TYPE (sym);
3111 return CLASSNAME;
3112 }
3113 }
3114
3115 /* Input names that aren't symbols but ARE valid hex numbers, when
3116 the input radix permits them, can be names or numbers depending
3117 on the parse. Note we support radixes > 16 here. */
3118 if (!bsym.symbol
3119 && ((copy[0] >= 'a' && copy[0] < 'a' + input_radix - 10)
3120 || (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10)))
3121 {
3122 YYSTYPE newlval; /* Its value is ignored. */
3123 int hextype = parse_number (par_state, copy.c_str (), yylval.sval.length,
3124 0, &newlval);
3125
3126 if (hextype == INT)
3127 {
3128 yylval.ssym.sym = bsym;
3129 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
3130 return NAME_OR_INT;
3131 }
3132 }
3133
3134 /* Any other kind of symbol */
3135 yylval.ssym.sym = bsym;
3136 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
3137
3138 if (bsym.symbol == NULL
3139 && par_state->language ()->la_language == language_cplus
3140 && is_a_field_of_this.type == NULL
3141 && lookup_minimal_symbol (copy.c_str (), NULL, NULL).minsym == NULL)
3142 return UNKNOWN_CPP_NAME;
3143
3144 return NAME;
3145}
3146
3147/* Like classify_name, but used by the inner loop of the lexer, when a
3148 name might have already been seen. CONTEXT is the context type, or
3149 NULL if this is the first component of a name. */
3150
3151static int
3152classify_inner_name (struct parser_state *par_state,
3153 const struct block *block, struct type *context)
3154{
3155 struct type *type;
3156
3157 if (context == NULL)
3158 return classify_name (par_state, block, false, false);
3159
3160 type = check_typedef (context);
3161 if (!type_aggregate_p (type))
3162 return ERROR;
3163
3164 std::string copy = copy_name (yylval.ssym.stoken);
3165 /* N.B. We assume the symbol can only be in VAR_DOMAIN. */
3166 yylval.ssym.sym = cp_lookup_nested_symbol (type, copy.c_str (), block,
3167 VAR_DOMAIN);
3168
3169 /* If no symbol was found, search for a matching base class named
3170 COPY. This will allow users to enter qualified names of class members
3171 relative to the `this' pointer. */
3172 if (yylval.ssym.sym.symbol == NULL)
3173 {
3174 struct type *base_type = cp_find_type_baseclass_by_name (type,
3175 copy.c_str ());
3176
3177 if (base_type != NULL)
3178 {
3179 yylval.tsym.type = base_type;
3180 return TYPENAME;
3181 }
3182
3183 return ERROR;
3184 }
3185
3186 switch (SYMBOL_CLASS (yylval.ssym.sym.symbol))
3187 {
3188 case LOC_BLOCK:
3189 case LOC_LABEL:
3190 /* cp_lookup_nested_symbol might have accidentally found a constructor
3191 named COPY when we really wanted a base class of the same name.
3192 Double-check this case by looking for a base class. */
3193 {
3194 struct type *base_type
3195 = cp_find_type_baseclass_by_name (type, copy.c_str ());
3196
3197 if (base_type != NULL)
3198 {
3199 yylval.tsym.type = base_type;
3200 return TYPENAME;
3201 }
3202 }
3203 return ERROR;
3204
3205 case LOC_TYPEDEF:
3206 yylval.tsym.type = SYMBOL_TYPE (yylval.ssym.sym.symbol);
3207 return TYPENAME;
3208
3209 default:
3210 return NAME;
3211 }
3212 internal_error (__FILE__, __LINE__, _("not reached"));
3213}
3214
3215/* The outer level of a two-level lexer. This calls the inner lexer
3216 to return tokens. It then either returns these tokens, or
3217 aggregates them into a larger token. This lets us work around a
3218 problem in our parsing approach, where the parser could not
3219 distinguish between qualified names and qualified types at the
3220 right point.
3221
3222 This approach is still not ideal, because it mishandles template
3223 types. See the comment in lex_one_token for an example. However,
3224 this is still an improvement over the earlier approach, and will
3225 suffice until we move to better parsing technology. */
3226
3227static int
3228yylex (void)
3229{
3230 token_and_value current;
3231 int first_was_coloncolon, last_was_coloncolon;
3232 struct type *context_type = NULL;
3233 int last_to_examine, next_to_examine, checkpoint;
3234 const struct block *search_block;
3235 bool is_quoted_name, last_lex_was_structop;
3236
3237 if (popping && !token_fifo.empty ())
3238 goto do_pop;
3239 popping = 0;
3240
3241 last_lex_was_structop = last_was_structop;
3242
3243 /* Read the first token and decide what to do. Most of the
3244 subsequent code is C++-only; but also depends on seeing a "::" or
3245 name-like token. */
3246 current.token = lex_one_token (pstate, &is_quoted_name);
3247 if (current.token == NAME)
3248 current.token = classify_name (pstate, pstate->expression_context_block,
3249 is_quoted_name, last_lex_was_structop);
3250 if (pstate->language ()->la_language != language_cplus
3251 || (current.token != TYPENAME && current.token != COLONCOLON
3252 && current.token != FILENAME))
3253 return current.token;
3254
3255 /* Read any sequence of alternating "::" and name-like tokens into
3256 the token FIFO. */
3257 current.value = yylval;
3258 token_fifo.push_back (current);
3259 last_was_coloncolon = current.token == COLONCOLON;
3260 while (1)
3261 {
3262 bool ignore;
3263
3264 /* We ignore quoted names other than the very first one.
3265 Subsequent ones do not have any special meaning. */
3266 current.token = lex_one_token (pstate, &ignore);
3267 current.value = yylval;
3268 token_fifo.push_back (current);
3269
3270 if ((last_was_coloncolon && current.token != NAME)
3271 || (!last_was_coloncolon && current.token != COLONCOLON))
3272 break;
3273 last_was_coloncolon = !last_was_coloncolon;
3274 }
3275 popping = 1;
3276
3277 /* We always read one extra token, so compute the number of tokens
3278 to examine accordingly. */
3279 last_to_examine = token_fifo.size () - 2;
3280 next_to_examine = 0;
3281
3282 current = token_fifo[next_to_examine];
3283 ++next_to_examine;
3284
3285 name_obstack.clear ();
3286 checkpoint = 0;
3287 if (current.token == FILENAME)
3288 search_block = current.value.bval;
3289 else if (current.token == COLONCOLON)
3290 search_block = NULL;
3291 else
3292 {
3293 gdb_assert (current.token == TYPENAME);
3294 search_block = pstate->expression_context_block;
3295 obstack_grow (&name_obstack, current.value.sval.ptr,
3296 current.value.sval.length);
3297 context_type = current.value.tsym.type;
3298 checkpoint = 1;
3299 }
3300
3301 first_was_coloncolon = current.token == COLONCOLON;
3302 last_was_coloncolon = first_was_coloncolon;
3303
3304 while (next_to_examine <= last_to_examine)
3305 {
3306 token_and_value next;
3307
3308 next = token_fifo[next_to_examine];
3309 ++next_to_examine;
3310
3311 if (next.token == NAME && last_was_coloncolon)
3312 {
3313 int classification;
3314
3315 yylval = next.value;
3316 classification = classify_inner_name (pstate, search_block,
3317 context_type);
3318 /* We keep going until we either run out of names, or until
3319 we have a qualified name which is not a type. */
3320 if (classification != TYPENAME && classification != NAME)
3321 break;
3322
3323 /* Accept up to this token. */
3324 checkpoint = next_to_examine;
3325
3326 /* Update the partial name we are constructing. */
3327 if (context_type != NULL)
3328 {
3329 /* We don't want to put a leading "::" into the name. */
3330 obstack_grow_str (&name_obstack, "::");
3331 }
3332 obstack_grow (&name_obstack, next.value.sval.ptr,
3333 next.value.sval.length);
3334
3335 yylval.sval.ptr = (const char *) obstack_base (&name_obstack);
3336 yylval.sval.length = obstack_object_size (&name_obstack);
3337 current.value = yylval;
3338 current.token = classification;
3339
3340 last_was_coloncolon = 0;
3341
3342 if (classification == NAME)
3343 break;
3344
3345 context_type = yylval.tsym.type;
3346 }
3347 else if (next.token == COLONCOLON && !last_was_coloncolon)
3348 last_was_coloncolon = 1;
3349 else
3350 {
3351 /* We've reached the end of the name. */
3352 break;
3353 }
3354 }
3355
3356 /* If we have a replacement token, install it as the first token in
3357 the FIFO, and delete the other constituent tokens. */
3358 if (checkpoint > 0)
3359 {
3360 current.value.sval.ptr
3361 = obstack_strndup (&cpstate->expansion_obstack,
3362 current.value.sval.ptr,
3363 current.value.sval.length);
3364
3365 token_fifo[0] = current;
3366 if (checkpoint > 1)
3367 token_fifo.erase (token_fifo.begin () + 1,
3368 token_fifo.begin () + checkpoint);
3369 }
3370
3371 do_pop:
3372 current = token_fifo[0];
3373 token_fifo.erase (token_fifo.begin ());
3374 yylval = current.value;
3375 return current.token;
3376}
3377
3378int
3379c_parse (struct parser_state *par_state)
3380{
3381 /* Setting up the parser state. */
3382 scoped_restore pstate_restore = make_scoped_restore (&pstate);
3383 gdb_assert (par_state != NULL);
3384 pstate = par_state;
3385
3386 c_parse_state cstate;
3387 scoped_restore cstate_restore = make_scoped_restore (&cpstate, &cstate);
3388
3389 gdb::unique_xmalloc_ptr<struct macro_scope> macro_scope;
3390
3391 if (par_state->expression_context_block)
3392 macro_scope
3393 = sal_macro_scope (find_pc_line (par_state->expression_context_pc, 0));
3394 else
3395 macro_scope = default_macro_scope ();
3396 if (! macro_scope)
3397 macro_scope = user_macro_scope ();
3398
3399 scoped_restore restore_macro_scope
3400 = make_scoped_restore (&expression_macro_scope, macro_scope.get ());
3401
3402 scoped_restore restore_yydebug = make_scoped_restore (&yydebug,
3403 parser_debug);
3404
3405 /* Initialize some state used by the lexer. */
3406 last_was_structop = false;
3407 saw_name_at_eof = 0;
3408 paren_depth = 0;
3409
3410 token_fifo.clear ();
3411 popping = 0;
3412 name_obstack.clear ();
3413
3414 return yyparse ();
3415}
3416
3417#ifdef YYBISON
3418
3419/* This is called via the YYPRINT macro when parser debugging is
3420 enabled. It prints a token's value. */
3421
3422static void
3423c_print_token (FILE *file, int type, YYSTYPE value)
3424{
3425 switch (type)
3426 {
3427 case INT:
3428 parser_fprintf (file, "typed_val_int<%s, %s>",
3429 TYPE_SAFE_NAME (value.typed_val_int.type),
3430 pulongest (value.typed_val_int.val));
3431 break;
3432
3433 case CHAR:
3434 case STRING:
3435 {
3436 char *copy = (char *) alloca (value.tsval.length + 1);
3437
3438 memcpy (copy, value.tsval.ptr, value.tsval.length);
3439 copy[value.tsval.length] = '\0';
3440
3441 parser_fprintf (file, "tsval<type=%d, %s>", value.tsval.type, copy);
3442 }
3443 break;
3444
3445 case NSSTRING:
3446 case DOLLAR_VARIABLE:
3447 parser_fprintf (file, "sval<%s>", copy_name (value.sval).c_str ());
3448 break;
3449
3450 case TYPENAME:
3451 parser_fprintf (file, "tsym<type=%s, name=%s>",
3452 TYPE_SAFE_NAME (value.tsym.type),
3453 copy_name (value.tsym.stoken).c_str ());
3454 break;
3455
3456 case NAME:
3457 case UNKNOWN_CPP_NAME:
3458 case NAME_OR_INT:
3459 case BLOCKNAME:
3460 parser_fprintf (file, "ssym<name=%s, sym=%s, field_of_this=%d>",
3461 copy_name (value.ssym.stoken).c_str (),
3462 (value.ssym.sym.symbol == NULL
3463 ? "(null)" : value.ssym.sym.symbol->print_name ()),
3464 value.ssym.is_a_field_of_this);
3465 break;
3466
3467 case FILENAME:
3468 parser_fprintf (file, "bval<%s>", host_address_to_string (value.bval));
3469 break;
3470 }
3471}
3472
3473#endif
3474
3475static void
3476yyerror (const char *msg)
3477{
3478 if (pstate->prev_lexptr)
3479 pstate->lexptr = pstate->prev_lexptr;
3480
3481 error (_("A %s in expression, near `%s'."), msg, pstate->lexptr);
3482}
GDB Binutils - Deliverables
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