1 /* YACC parser for C expressions, for GDB.
2 Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2003, 2004, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 /* Parse a C expression from text in a string,
22 and return the result as a struct expression pointer.
23 That structure contains arithmetic operations in reverse polish,
24 with constants represented by operations that are followed by special data.
25 See expression.h for the details of the format.
26 What is important here is that it can be built up sequentially
27 during the process of parsing; the lower levels of the tree always
28 come first in the result.
30 Note that malloc's and realloc's in this file are transformed to
31 xmalloc and xrealloc respectively by the same sed command in the
32 makefile that remaps any other malloc/realloc inserted by the parser
33 generator. Doing this with #defines and trying to control the interaction
34 with include files (<malloc.h> and <stdlib.h> for example) just became
35 too messy, particularly when such includes can be inserted at random
36 times by the parser generator. */
41 #include "gdb_string.h"
43 #include "expression.h"
45 #include "parser-defs.h"
48 #include "bfd.h" /* Required by objfiles.h. */
49 #include "symfile.h" /* Required by objfiles.h. */
50 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
53 #include "cp-support.h"
55 #include "gdb_assert.h"
56 #include "macroscope.h"
58 #define parse_type builtin_type (parse_gdbarch)
60 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
61 as well as gratuitiously global symbol names, so we can have multiple
62 yacc generated parsers in gdb. Note that these are only the variables
63 produced by yacc. If other parser generators (bison, byacc, etc) produce
64 additional global names that conflict at link time, then those parser
65 generators need to be fixed instead of adding those names to this list. */
67 #define yymaxdepth c_maxdepth
68 #define yyparse c_parse_internal
70 #define yyerror c_error
73 #define yydebug c_debug
82 #define yyerrflag c_errflag
83 #define yynerrs c_nerrs
88 #define yystate c_state
94 #define yyreds c_reds /* With YYDEBUG defined */
95 #define yytoks c_toks /* With YYDEBUG defined */
96 #define yyname c_name /* With YYDEBUG defined */
97 #define yyrule c_rule /* With YYDEBUG defined */
100 #define yydefred c_yydefred
101 #define yydgoto c_yydgoto
102 #define yysindex c_yysindex
103 #define yyrindex c_yyrindex
104 #define yygindex c_yygindex
105 #define yytable c_yytable
106 #define yycheck c_yycheck
109 #define YYDEBUG 1 /* Default to yydebug support */
112 #define YYFPRINTF parser_fprintf
116 static int yylex (void);
118 void yyerror (char *);
122 /* Although the yacc "value" of an expression is not used,
123 since the result is stored in the structure being created,
124 other node types do have values. */
140 } typed_val_decfloat;
144 struct typed_stoken tsval;
146 struct symtoken ssym;
149 enum exp_opcode opcode;
150 struct internalvar *ivar;
152 struct stoken_vector svec;
158 /* YYSTYPE gets defined by %union */
159 static int parse_number (char *, int, int, YYSTYPE *);
160 static struct stoken operator_stoken (const char *);
163 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
165 %type <tval> type typebase
166 %type <tvec> nonempty_typelist
167 /* %type <bval> block */
169 /* Fancy type parsing. */
170 %type <voidval> func_mod direct_abs_decl abs_decl
172 %type <lval> array_mod
174 %token <typed_val_int> INT
175 %token <typed_val_float> FLOAT
176 %token <typed_val_decfloat> DECFLOAT
178 /* Both NAME and TYPENAME tokens represent symbols in the input,
179 and both convey their data as strings.
180 But a TYPENAME is a string that happens to be defined as a typedef
181 or builtin type name (such as int or char)
182 and a NAME is any other symbol.
183 Contexts where this distinction is not important can use the
184 nonterminal "name", which matches either NAME or TYPENAME. */
186 %token <tsval> STRING
188 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
189 %token <ssym> UNKNOWN_CPP_NAME
190 %token <voidval> COMPLETE
191 %token <tsym> TYPENAME
193 %type <svec> string_exp
194 %type <ssym> name_not_typename
195 %type <tsym> typename
197 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
198 but which would parse as a valid number in the current input radix.
199 E.g. "c" when input_radix==16. Depending on the parse, it will be
200 turned into a name or into a number. */
202 %token <ssym> NAME_OR_INT
205 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
209 %type <sval> operator
210 %token REINTERPRET_CAST DYNAMIC_CAST STATIC_CAST CONST_CAST
212 /* Special type cases, put in to allow the parser to distinguish different
214 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
216 %token <sval> VARIABLE
218 %token <opcode> ASSIGN_MODIFY
227 %right '=' ASSIGN_MODIFY
235 %left '<' '>' LEQ GEQ
240 %right UNARY INCREMENT DECREMENT
241 %right ARROW ARROW_STAR '.' DOT_STAR '[' '('
242 %token <ssym> BLOCKNAME
243 %token <bval> FILENAME
255 { write_exp_elt_opcode(OP_TYPE);
256 write_exp_elt_type($1);
257 write_exp_elt_opcode(OP_TYPE);}
260 /* Expressions, including the comma operator. */
263 { write_exp_elt_opcode (BINOP_COMMA); }
266 /* Expressions, not including the comma operator. */
267 exp : '*' exp %prec UNARY
268 { write_exp_elt_opcode (UNOP_IND); }
271 exp : '&' exp %prec UNARY
272 { write_exp_elt_opcode (UNOP_ADDR); }
275 exp : '-' exp %prec UNARY
276 { write_exp_elt_opcode (UNOP_NEG); }
279 exp : '+' exp %prec UNARY
280 { write_exp_elt_opcode (UNOP_PLUS); }
283 exp : '!' exp %prec UNARY
284 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
287 exp : '~' exp %prec UNARY
288 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
291 exp : INCREMENT exp %prec UNARY
292 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
295 exp : DECREMENT exp %prec UNARY
296 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
299 exp : exp INCREMENT %prec UNARY
300 { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
303 exp : exp DECREMENT %prec UNARY
304 { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
307 exp : SIZEOF exp %prec UNARY
308 { write_exp_elt_opcode (UNOP_SIZEOF); }
312 { write_exp_elt_opcode (STRUCTOP_PTR);
313 write_exp_string ($3);
314 write_exp_elt_opcode (STRUCTOP_PTR); }
317 exp : exp ARROW name COMPLETE
318 { mark_struct_expression ();
319 write_exp_elt_opcode (STRUCTOP_PTR);
320 write_exp_string ($3);
321 write_exp_elt_opcode (STRUCTOP_PTR); }
324 exp : exp ARROW COMPLETE
326 mark_struct_expression ();
327 write_exp_elt_opcode (STRUCTOP_PTR);
330 write_exp_string (s);
331 write_exp_elt_opcode (STRUCTOP_PTR); }
334 exp : exp ARROW qualified_name
335 { /* exp->type::name becomes exp->*(&type::name) */
336 /* Note: this doesn't work if name is a
337 static member! FIXME */
338 write_exp_elt_opcode (UNOP_ADDR);
339 write_exp_elt_opcode (STRUCTOP_MPTR); }
342 exp : exp ARROW_STAR exp
343 { write_exp_elt_opcode (STRUCTOP_MPTR); }
347 { write_exp_elt_opcode (STRUCTOP_STRUCT);
348 write_exp_string ($3);
349 write_exp_elt_opcode (STRUCTOP_STRUCT); }
352 exp : exp '.' name COMPLETE
353 { mark_struct_expression ();
354 write_exp_elt_opcode (STRUCTOP_STRUCT);
355 write_exp_string ($3);
356 write_exp_elt_opcode (STRUCTOP_STRUCT); }
359 exp : exp '.' COMPLETE
361 mark_struct_expression ();
362 write_exp_elt_opcode (STRUCTOP_STRUCT);
365 write_exp_string (s);
366 write_exp_elt_opcode (STRUCTOP_STRUCT); }
369 exp : exp '.' qualified_name
370 { /* exp.type::name becomes exp.*(&type::name) */
371 /* Note: this doesn't work if name is a
372 static member! FIXME */
373 write_exp_elt_opcode (UNOP_ADDR);
374 write_exp_elt_opcode (STRUCTOP_MEMBER); }
377 exp : exp DOT_STAR exp
378 { write_exp_elt_opcode (STRUCTOP_MEMBER); }
381 exp : exp '[' exp1 ']'
382 { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
386 /* This is to save the value of arglist_len
387 being accumulated by an outer function call. */
388 { start_arglist (); }
389 arglist ')' %prec ARROW
390 { write_exp_elt_opcode (OP_FUNCALL);
391 write_exp_elt_longcst ((LONGEST) end_arglist ());
392 write_exp_elt_opcode (OP_FUNCALL); }
395 exp : UNKNOWN_CPP_NAME '('
397 /* This could potentially be a an argument defined
398 lookup function (Koenig). */
399 write_exp_elt_opcode (OP_ADL_FUNC);
400 write_exp_elt_block (expression_context_block);
401 write_exp_elt_sym (NULL); /* Placeholder. */
402 write_exp_string ($1.stoken);
403 write_exp_elt_opcode (OP_ADL_FUNC);
405 /* This is to save the value of arglist_len
406 being accumulated by an outer function call. */
410 arglist ')' %prec ARROW
412 write_exp_elt_opcode (OP_FUNCALL);
413 write_exp_elt_longcst ((LONGEST) end_arglist ());
414 write_exp_elt_opcode (OP_FUNCALL);
419 { start_arglist (); }
429 arglist : arglist ',' exp %prec ABOVE_COMMA
433 exp : exp '(' nonempty_typelist ')' const_or_volatile
435 write_exp_elt_opcode (TYPE_INSTANCE);
436 write_exp_elt_longcst ((LONGEST) $<ivec>3[0]);
437 for (i = 0; i < $<ivec>3[0]; ++i)
438 write_exp_elt_type ($<tvec>3[i + 1]);
439 write_exp_elt_longcst((LONGEST) $<ivec>3[0]);
440 write_exp_elt_opcode (TYPE_INSTANCE);
446 { $$ = end_arglist () - 1; }
448 exp : lcurly arglist rcurly %prec ARROW
449 { write_exp_elt_opcode (OP_ARRAY);
450 write_exp_elt_longcst ((LONGEST) 0);
451 write_exp_elt_longcst ((LONGEST) $3);
452 write_exp_elt_opcode (OP_ARRAY); }
455 exp : lcurly type rcurly exp %prec UNARY
456 { write_exp_elt_opcode (UNOP_MEMVAL);
457 write_exp_elt_type ($2);
458 write_exp_elt_opcode (UNOP_MEMVAL); }
461 exp : '(' type ')' exp %prec UNARY
462 { write_exp_elt_opcode (UNOP_CAST);
463 write_exp_elt_type ($2);
464 write_exp_elt_opcode (UNOP_CAST); }
471 /* Binary operators in order of decreasing precedence. */
474 { write_exp_elt_opcode (BINOP_REPEAT); }
478 { write_exp_elt_opcode (BINOP_MUL); }
482 { write_exp_elt_opcode (BINOP_DIV); }
486 { write_exp_elt_opcode (BINOP_REM); }
490 { write_exp_elt_opcode (BINOP_ADD); }
494 { write_exp_elt_opcode (BINOP_SUB); }
498 { write_exp_elt_opcode (BINOP_LSH); }
502 { write_exp_elt_opcode (BINOP_RSH); }
506 { write_exp_elt_opcode (BINOP_EQUAL); }
509 exp : exp NOTEQUAL exp
510 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
514 { write_exp_elt_opcode (BINOP_LEQ); }
518 { write_exp_elt_opcode (BINOP_GEQ); }
522 { write_exp_elt_opcode (BINOP_LESS); }
526 { write_exp_elt_opcode (BINOP_GTR); }
530 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
534 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
538 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
542 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
546 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
549 exp : exp '?' exp ':' exp %prec '?'
550 { write_exp_elt_opcode (TERNOP_COND); }
554 { write_exp_elt_opcode (BINOP_ASSIGN); }
557 exp : exp ASSIGN_MODIFY exp
558 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
559 write_exp_elt_opcode ($2);
560 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
564 { write_exp_elt_opcode (OP_LONG);
565 write_exp_elt_type ($1.type);
566 write_exp_elt_longcst ((LONGEST)($1.val));
567 write_exp_elt_opcode (OP_LONG); }
572 struct stoken_vector vec;
575 write_exp_string_vector ($1.type, &vec);
581 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
582 write_exp_elt_opcode (OP_LONG);
583 write_exp_elt_type (val.typed_val_int.type);
584 write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
585 write_exp_elt_opcode (OP_LONG);
591 { write_exp_elt_opcode (OP_DOUBLE);
592 write_exp_elt_type ($1.type);
593 write_exp_elt_dblcst ($1.dval);
594 write_exp_elt_opcode (OP_DOUBLE); }
598 { write_exp_elt_opcode (OP_DECFLOAT);
599 write_exp_elt_type ($1.type);
600 write_exp_elt_decfloatcst ($1.val);
601 write_exp_elt_opcode (OP_DECFLOAT); }
609 write_dollar_variable ($1);
613 exp : SIZEOF '(' type ')' %prec UNARY
614 { write_exp_elt_opcode (OP_LONG);
615 write_exp_elt_type (lookup_signed_typename
616 (parse_language, parse_gdbarch,
619 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
620 write_exp_elt_opcode (OP_LONG); }
623 exp : REINTERPRET_CAST '<' type '>' '(' exp ')' %prec UNARY
624 { write_exp_elt_opcode (UNOP_REINTERPRET_CAST);
625 write_exp_elt_type ($3);
626 write_exp_elt_opcode (UNOP_REINTERPRET_CAST); }
629 exp : STATIC_CAST '<' type '>' '(' exp ')' %prec UNARY
630 { write_exp_elt_opcode (UNOP_CAST);
631 write_exp_elt_type ($3);
632 write_exp_elt_opcode (UNOP_CAST); }
635 exp : DYNAMIC_CAST '<' type '>' '(' exp ')' %prec UNARY
636 { write_exp_elt_opcode (UNOP_DYNAMIC_CAST);
637 write_exp_elt_type ($3);
638 write_exp_elt_opcode (UNOP_DYNAMIC_CAST); }
641 exp : CONST_CAST '<' type '>' '(' exp ')' %prec UNARY
642 { /* We could do more error checking here, but
643 it doesn't seem worthwhile. */
644 write_exp_elt_opcode (UNOP_CAST);
645 write_exp_elt_type ($3);
646 write_exp_elt_opcode (UNOP_CAST); }
652 /* We copy the string here, and not in the
653 lexer, to guarantee that we do not leak a
654 string. Note that we follow the
655 NUL-termination convention of the
657 struct typed_stoken *vec = XNEW (struct typed_stoken);
662 vec->length = $1.length;
663 vec->ptr = malloc ($1.length + 1);
664 memcpy (vec->ptr, $1.ptr, $1.length + 1);
669 /* Note that we NUL-terminate here, but just
673 $$.tokens = realloc ($$.tokens,
674 $$.len * sizeof (struct typed_stoken));
676 p = malloc ($2.length + 1);
677 memcpy (p, $2.ptr, $2.length + 1);
679 $$.tokens[$$.len - 1].type = $2.type;
680 $$.tokens[$$.len - 1].length = $2.length;
681 $$.tokens[$$.len - 1].ptr = p;
688 enum c_string_type type = C_STRING;
690 for (i = 0; i < $1.len; ++i)
692 switch ($1.tokens[i].type)
700 && type != $1.tokens[i].type)
701 error ("Undefined string concatenation.");
702 type = $1.tokens[i].type;
706 internal_error (__FILE__, __LINE__,
707 "unrecognized type in string concatenation");
711 write_exp_string_vector (type, &$1);
712 for (i = 0; i < $1.len; ++i)
713 free ($1.tokens[i].ptr);
720 { write_exp_elt_opcode (OP_LONG);
721 write_exp_elt_type (parse_type->builtin_bool);
722 write_exp_elt_longcst ((LONGEST) 1);
723 write_exp_elt_opcode (OP_LONG); }
727 { write_exp_elt_opcode (OP_LONG);
728 write_exp_elt_type (parse_type->builtin_bool);
729 write_exp_elt_longcst ((LONGEST) 0);
730 write_exp_elt_opcode (OP_LONG); }
738 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
740 error ("No file or function \"%s\".",
741 copy_name ($1.stoken));
749 block : block COLONCOLON name
751 = lookup_symbol (copy_name ($3), $1,
752 VAR_DOMAIN, (int *) NULL);
753 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
754 error ("No function \"%s\" in specified context.",
756 $$ = SYMBOL_BLOCK_VALUE (tem); }
759 variable: block COLONCOLON name
760 { struct symbol *sym;
761 sym = lookup_symbol (copy_name ($3), $1,
762 VAR_DOMAIN, (int *) NULL);
764 error ("No symbol \"%s\" in specified context.",
767 write_exp_elt_opcode (OP_VAR_VALUE);
768 /* block_found is set by lookup_symbol. */
769 write_exp_elt_block (block_found);
770 write_exp_elt_sym (sym);
771 write_exp_elt_opcode (OP_VAR_VALUE); }
774 qualified_name: TYPENAME COLONCOLON name
776 struct type *type = $1.type;
777 CHECK_TYPEDEF (type);
778 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
779 && TYPE_CODE (type) != TYPE_CODE_UNION
780 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
781 error ("`%s' is not defined as an aggregate type.",
784 write_exp_elt_opcode (OP_SCOPE);
785 write_exp_elt_type (type);
786 write_exp_string ($3);
787 write_exp_elt_opcode (OP_SCOPE);
789 | TYPENAME COLONCOLON '~' name
791 struct type *type = $1.type;
792 struct stoken tmp_token;
793 CHECK_TYPEDEF (type);
794 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
795 && TYPE_CODE (type) != TYPE_CODE_UNION
796 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
797 error ("`%s' is not defined as an aggregate type.",
800 tmp_token.ptr = (char*) alloca ($4.length + 2);
801 tmp_token.length = $4.length + 1;
802 tmp_token.ptr[0] = '~';
803 memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
804 tmp_token.ptr[tmp_token.length] = 0;
806 /* Check for valid destructor name. */
807 destructor_name_p (tmp_token.ptr, type);
808 write_exp_elt_opcode (OP_SCOPE);
809 write_exp_elt_type (type);
810 write_exp_string (tmp_token);
811 write_exp_elt_opcode (OP_SCOPE);
813 | TYPENAME COLONCOLON name COLONCOLON name
815 char *copy = copy_name ($3);
816 error (_("No type \"%s\" within class "
817 "or namespace \"%s\"."),
818 copy, TYPE_NAME ($1.type));
822 variable: qualified_name
823 | COLONCOLON name_not_typename
825 char *name = copy_name ($2.stoken);
827 struct minimal_symbol *msymbol;
830 lookup_symbol (name, (const struct block *) NULL,
831 VAR_DOMAIN, (int *) NULL);
834 write_exp_elt_opcode (OP_VAR_VALUE);
835 write_exp_elt_block (NULL);
836 write_exp_elt_sym (sym);
837 write_exp_elt_opcode (OP_VAR_VALUE);
841 msymbol = lookup_minimal_symbol (name, NULL, NULL);
843 write_exp_msymbol (msymbol);
844 else if (!have_full_symbols () && !have_partial_symbols ())
845 error ("No symbol table is loaded. Use the \"file\" command.");
847 error ("No symbol \"%s\" in current context.", name);
851 variable: name_not_typename
852 { struct symbol *sym = $1.sym;
856 if (symbol_read_needs_frame (sym))
858 if (innermost_block == 0
859 || contained_in (block_found,
861 innermost_block = block_found;
864 write_exp_elt_opcode (OP_VAR_VALUE);
865 /* We want to use the selected frame, not
866 another more inner frame which happens to
867 be in the same block. */
868 write_exp_elt_block (NULL);
869 write_exp_elt_sym (sym);
870 write_exp_elt_opcode (OP_VAR_VALUE);
872 else if ($1.is_a_field_of_this)
874 /* C++: it hangs off of `this'. Must
875 not inadvertently convert from a method call
877 if (innermost_block == 0
878 || contained_in (block_found,
880 innermost_block = block_found;
881 write_exp_elt_opcode (OP_THIS);
882 write_exp_elt_opcode (OP_THIS);
883 write_exp_elt_opcode (STRUCTOP_PTR);
884 write_exp_string ($1.stoken);
885 write_exp_elt_opcode (STRUCTOP_PTR);
889 struct minimal_symbol *msymbol;
890 char *arg = copy_name ($1.stoken);
893 lookup_minimal_symbol (arg, NULL, NULL);
895 write_exp_msymbol (msymbol);
896 else if (!have_full_symbols () && !have_partial_symbols ())
897 error ("No symbol table is loaded. Use the \"file\" command.");
899 error ("No symbol \"%s\" in current context.",
900 copy_name ($1.stoken));
905 space_identifier : '@' NAME
906 { push_type_address_space (copy_name ($2.stoken));
907 push_type (tp_space_identifier);
911 const_or_volatile: const_or_volatile_noopt
915 cv_with_space_id : const_or_volatile space_identifier const_or_volatile
918 const_or_volatile_or_space_identifier_noopt: cv_with_space_id
919 | const_or_volatile_noopt
922 const_or_volatile_or_space_identifier:
923 const_or_volatile_or_space_identifier_noopt
928 { push_type (tp_pointer); $$ = 0; }
930 { push_type (tp_pointer); $$ = $2; }
932 { push_type (tp_reference); $$ = 0; }
934 { push_type (tp_reference); $$ = $2; }
938 direct_abs_decl: '(' abs_decl ')'
940 | direct_abs_decl array_mod
943 push_type (tp_array);
948 push_type (tp_array);
952 | direct_abs_decl func_mod
953 { push_type (tp_function); }
955 { push_type (tp_function); }
966 | '(' nonempty_typelist ')'
967 { free ($2); $$ = 0; }
970 /* We used to try to recognize pointer to member types here, but
971 that didn't work (shift/reduce conflicts meant that these rules never
972 got executed). The problem is that
973 int (foo::bar::baz::bizzle)
974 is a function type but
975 int (foo::bar::baz::bizzle::*)
976 is a pointer to member type. Stroustrup loses again! */
981 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
985 { $$ = lookup_signed_typename (parse_language,
989 { $$ = lookup_signed_typename (parse_language,
993 { $$ = lookup_signed_typename (parse_language,
997 { $$ = lookup_signed_typename (parse_language,
1000 | LONG SIGNED_KEYWORD INT_KEYWORD
1001 { $$ = lookup_signed_typename (parse_language,
1004 | LONG SIGNED_KEYWORD
1005 { $$ = lookup_signed_typename (parse_language,
1008 | SIGNED_KEYWORD LONG INT_KEYWORD
1009 { $$ = lookup_signed_typename (parse_language,
1012 | UNSIGNED LONG INT_KEYWORD
1013 { $$ = lookup_unsigned_typename (parse_language,
1016 | LONG UNSIGNED INT_KEYWORD
1017 { $$ = lookup_unsigned_typename (parse_language,
1021 { $$ = lookup_unsigned_typename (parse_language,
1025 { $$ = lookup_signed_typename (parse_language,
1028 | LONG LONG INT_KEYWORD
1029 { $$ = lookup_signed_typename (parse_language,
1032 | LONG LONG SIGNED_KEYWORD INT_KEYWORD
1033 { $$ = lookup_signed_typename (parse_language,
1036 | LONG LONG SIGNED_KEYWORD
1037 { $$ = lookup_signed_typename (parse_language,
1040 | SIGNED_KEYWORD LONG LONG
1041 { $$ = lookup_signed_typename (parse_language,
1044 | SIGNED_KEYWORD LONG LONG INT_KEYWORD
1045 { $$ = lookup_signed_typename (parse_language,
1048 | UNSIGNED LONG LONG
1049 { $$ = lookup_unsigned_typename (parse_language,
1052 | UNSIGNED LONG LONG INT_KEYWORD
1053 { $$ = lookup_unsigned_typename (parse_language,
1056 | LONG LONG UNSIGNED
1057 { $$ = lookup_unsigned_typename (parse_language,
1060 | LONG LONG UNSIGNED INT_KEYWORD
1061 { $$ = lookup_unsigned_typename (parse_language,
1065 { $$ = lookup_signed_typename (parse_language,
1068 | SHORT SIGNED_KEYWORD INT_KEYWORD
1069 { $$ = lookup_signed_typename (parse_language,
1072 | SHORT SIGNED_KEYWORD
1073 { $$ = lookup_signed_typename (parse_language,
1076 | UNSIGNED SHORT INT_KEYWORD
1077 { $$ = lookup_unsigned_typename (parse_language,
1081 { $$ = lookup_unsigned_typename (parse_language,
1084 | SHORT UNSIGNED INT_KEYWORD
1085 { $$ = lookup_unsigned_typename (parse_language,
1089 { $$ = lookup_typename (parse_language, parse_gdbarch,
1090 "double", (struct block *) NULL,
1092 | LONG DOUBLE_KEYWORD
1093 { $$ = lookup_typename (parse_language, parse_gdbarch,
1095 (struct block *) NULL, 0); }
1097 { $$ = lookup_struct (copy_name ($2),
1098 expression_context_block); }
1100 { $$ = lookup_struct (copy_name ($2),
1101 expression_context_block); }
1103 { $$ = lookup_union (copy_name ($2),
1104 expression_context_block); }
1106 { $$ = lookup_enum (copy_name ($2),
1107 expression_context_block); }
1109 { $$ = lookup_unsigned_typename (parse_language,
1111 TYPE_NAME($2.type)); }
1113 { $$ = lookup_unsigned_typename (parse_language,
1116 | SIGNED_KEYWORD typename
1117 { $$ = lookup_signed_typename (parse_language,
1119 TYPE_NAME($2.type)); }
1121 { $$ = lookup_signed_typename (parse_language,
1124 /* It appears that this rule for templates is never
1125 reduced; template recognition happens by lookahead
1126 in the token processing code in yylex. */
1127 | TEMPLATE name '<' type '>'
1128 { $$ = lookup_template_type(copy_name($2), $4,
1129 expression_context_block);
1131 | const_or_volatile_or_space_identifier_noopt typebase
1132 { $$ = follow_types ($2); }
1133 | typebase const_or_volatile_or_space_identifier_noopt
1134 { $$ = follow_types ($1); }
1140 $$.stoken.ptr = "int";
1141 $$.stoken.length = 3;
1142 $$.type = lookup_signed_typename (parse_language,
1148 $$.stoken.ptr = "long";
1149 $$.stoken.length = 4;
1150 $$.type = lookup_signed_typename (parse_language,
1156 $$.stoken.ptr = "short";
1157 $$.stoken.length = 5;
1158 $$.type = lookup_signed_typename (parse_language,
1166 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
1167 $<ivec>$[0] = 1; /* Number of types in vector */
1170 | nonempty_typelist ',' type
1171 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
1172 $$ = (struct type **) realloc ((char *) $1, len);
1173 $$[$<ivec>$[0]] = $3;
1178 | ptype const_or_volatile_or_space_identifier abs_decl const_or_volatile_or_space_identifier
1179 { $$ = follow_types ($1); }
1182 const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
1183 | VOLATILE_KEYWORD CONST_KEYWORD
1186 const_or_volatile_noopt: const_and_volatile
1187 { push_type (tp_const);
1188 push_type (tp_volatile);
1191 { push_type (tp_const); }
1193 { push_type (tp_volatile); }
1196 operator: OPERATOR NEW
1197 { $$ = operator_stoken (" new"); }
1199 { $$ = operator_stoken (" delete"); }
1200 | OPERATOR NEW '[' ']'
1201 { $$ = operator_stoken (" new[]"); }
1202 | OPERATOR DELETE '[' ']'
1203 { $$ = operator_stoken (" delete[]"); }
1205 { $$ = operator_stoken ("+"); }
1207 { $$ = operator_stoken ("-"); }
1209 { $$ = operator_stoken ("*"); }
1211 { $$ = operator_stoken ("/"); }
1213 { $$ = operator_stoken ("%"); }
1215 { $$ = operator_stoken ("^"); }
1217 { $$ = operator_stoken ("&"); }
1219 { $$ = operator_stoken ("|"); }
1221 { $$ = operator_stoken ("~"); }
1223 { $$ = operator_stoken ("!"); }
1225 { $$ = operator_stoken ("="); }
1227 { $$ = operator_stoken ("<"); }
1229 { $$ = operator_stoken (">"); }
1230 | OPERATOR ASSIGN_MODIFY
1231 { const char *op = "unknown";
1255 case BINOP_BITWISE_IOR:
1258 case BINOP_BITWISE_AND:
1261 case BINOP_BITWISE_XOR:
1268 $$ = operator_stoken (op);
1271 { $$ = operator_stoken ("<<"); }
1273 { $$ = operator_stoken (">>"); }
1275 { $$ = operator_stoken ("=="); }
1277 { $$ = operator_stoken ("!="); }
1279 { $$ = operator_stoken ("<="); }
1281 { $$ = operator_stoken (">="); }
1283 { $$ = operator_stoken ("&&"); }
1285 { $$ = operator_stoken ("||"); }
1286 | OPERATOR INCREMENT
1287 { $$ = operator_stoken ("++"); }
1288 | OPERATOR DECREMENT
1289 { $$ = operator_stoken ("--"); }
1291 { $$ = operator_stoken (","); }
1292 | OPERATOR ARROW_STAR
1293 { $$ = operator_stoken ("->*"); }
1295 { $$ = operator_stoken ("->"); }
1297 { $$ = operator_stoken ("()"); }
1299 { $$ = operator_stoken ("[]"); }
1303 struct ui_file *buf = mem_fileopen ();
1305 c_print_type ($2, NULL, buf, -1, 0);
1306 name = ui_file_xstrdup (buf, &length);
1307 ui_file_delete (buf);
1308 $$ = operator_stoken (name);
1315 name : NAME { $$ = $1.stoken; }
1316 | BLOCKNAME { $$ = $1.stoken; }
1317 | TYPENAME { $$ = $1.stoken; }
1318 | NAME_OR_INT { $$ = $1.stoken; }
1319 | UNKNOWN_CPP_NAME { $$ = $1.stoken; }
1320 | operator { $$ = $1; }
1323 name_not_typename : NAME
1325 /* These would be useful if name_not_typename was useful, but it is just
1326 a fake for "variable", so these cause reduce/reduce conflicts because
1327 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
1328 =exp) or just an exp. If name_not_typename was ever used in an lvalue
1329 context where only a name could occur, this might be useful.
1335 $$.sym = lookup_symbol ($1.ptr,
1336 expression_context_block,
1338 &$$.is_a_field_of_this);
1345 /* Returns a stoken of the operator name given by OP (which does not
1346 include the string "operator"). */
1347 static struct stoken
1348 operator_stoken (const char *op)
1350 static const char *operator_string = "operator";
1351 struct stoken st = { NULL, 0 };
1352 st.length = strlen (operator_string) + strlen (op);
1353 st.ptr = malloc (st.length + 1);
1354 strcpy (st.ptr, operator_string);
1355 strcat (st.ptr, op);
1357 /* The toplevel (c_parse) will free the memory allocated here. */
1358 make_cleanup (free, st.ptr);
1362 /* Take care of parsing a number (anything that starts with a digit).
1363 Set yylval and return the token type; update lexptr.
1364 LEN is the number of characters in it. */
1366 /*** Needs some error checking for the float case ***/
1369 parse_number (char *p, int len, int parsed_float, YYSTYPE *putithere)
1371 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
1372 here, and we do kind of silly things like cast to unsigned. */
1379 int base = input_radix;
1382 /* Number of "L" suffixes encountered. */
1385 /* We have found a "L" or "U" suffix. */
1386 int found_suffix = 0;
1389 struct type *signed_type;
1390 struct type *unsigned_type;
1397 /* If it ends at "df", "dd" or "dl", take it as type of decimal floating
1398 point. Return DECFLOAT. */
1400 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
1403 putithere->typed_val_decfloat.type
1404 = parse_type->builtin_decfloat;
1405 decimal_from_string (putithere->typed_val_decfloat.val, 4,
1406 gdbarch_byte_order (parse_gdbarch), p);
1411 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
1414 putithere->typed_val_decfloat.type
1415 = parse_type->builtin_decdouble;
1416 decimal_from_string (putithere->typed_val_decfloat.val, 8,
1417 gdbarch_byte_order (parse_gdbarch), p);
1422 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
1425 putithere->typed_val_decfloat.type
1426 = parse_type->builtin_declong;
1427 decimal_from_string (putithere->typed_val_decfloat.val, 16,
1428 gdbarch_byte_order (parse_gdbarch), p);
1433 if (! parse_c_float (parse_gdbarch, p, len,
1434 &putithere->typed_val_float.dval,
1435 &putithere->typed_val_float.type))
1440 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1484 if (c >= 'A' && c <= 'Z')
1486 if (c != 'l' && c != 'u')
1488 if (c >= '0' && c <= '9')
1496 if (base > 10 && c >= 'a' && c <= 'f')
1500 n += i = c - 'a' + 10;
1513 return ERROR; /* Char not a digit */
1516 return ERROR; /* Invalid digit in this base */
1518 /* Portably test for overflow (only works for nonzero values, so make
1519 a second check for zero). FIXME: Can't we just make n and prevn
1520 unsigned and avoid this? */
1521 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1522 unsigned_p = 1; /* Try something unsigned */
1524 /* Portably test for unsigned overflow.
1525 FIXME: This check is wrong; for example it doesn't find overflow
1526 on 0x123456789 when LONGEST is 32 bits. */
1527 if (c != 'l' && c != 'u' && n != 0)
1529 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
1530 error ("Numeric constant too large.");
1535 /* An integer constant is an int, a long, or a long long. An L
1536 suffix forces it to be long; an LL suffix forces it to be long
1537 long. If not forced to a larger size, it gets the first type of
1538 the above that it fits in. To figure out whether it fits, we
1539 shift it right and see whether anything remains. Note that we
1540 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1541 operation, because many compilers will warn about such a shift
1542 (which always produces a zero result). Sometimes gdbarch_int_bit
1543 or gdbarch_long_bit will be that big, sometimes not. To deal with
1544 the case where it is we just always shift the value more than
1545 once, with fewer bits each time. */
1547 un = (ULONGEST)n >> 2;
1549 && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
1551 high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
1553 /* A large decimal (not hex or octal) constant (between INT_MAX
1554 and UINT_MAX) is a long or unsigned long, according to ANSI,
1555 never an unsigned int, but this code treats it as unsigned
1556 int. This probably should be fixed. GCC gives a warning on
1559 unsigned_type = parse_type->builtin_unsigned_int;
1560 signed_type = parse_type->builtin_int;
1562 else if (long_p <= 1
1563 && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
1565 high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
1566 unsigned_type = parse_type->builtin_unsigned_long;
1567 signed_type = parse_type->builtin_long;
1572 if (sizeof (ULONGEST) * HOST_CHAR_BIT
1573 < gdbarch_long_long_bit (parse_gdbarch))
1574 /* A long long does not fit in a LONGEST. */
1575 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1577 shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
1578 high_bit = (ULONGEST) 1 << shift;
1579 unsigned_type = parse_type->builtin_unsigned_long_long;
1580 signed_type = parse_type->builtin_long_long;
1583 putithere->typed_val_int.val = n;
1585 /* If the high bit of the worked out type is set then this number
1586 has to be unsigned. */
1588 if (unsigned_p || (n & high_bit))
1590 putithere->typed_val_int.type = unsigned_type;
1594 putithere->typed_val_int.type = signed_type;
1600 /* Temporary obstack used for holding strings. */
1601 static struct obstack tempbuf;
1602 static int tempbuf_init;
1604 /* Parse a C escape sequence. The initial backslash of the sequence
1605 is at (*PTR)[-1]. *PTR will be updated to point to just after the
1606 last character of the sequence. If OUTPUT is not NULL, the
1607 translated form of the escape sequence will be written there. If
1608 OUTPUT is NULL, no output is written and the call will only affect
1609 *PTR. If an escape sequence is expressed in target bytes, then the
1610 entire sequence will simply be copied to OUTPUT. Return 1 if any
1611 character was emitted, 0 otherwise. */
1614 c_parse_escape (char **ptr, struct obstack *output)
1616 char *tokptr = *ptr;
1619 /* Some escape sequences undergo character set conversion. Those we
1623 /* Hex escapes do not undergo character set conversion, so keep
1624 the escape sequence for later. */
1627 obstack_grow_str (output, "\\x");
1629 if (!isxdigit (*tokptr))
1630 error (_("\\x escape without a following hex digit"));
1631 while (isxdigit (*tokptr))
1634 obstack_1grow (output, *tokptr);
1639 /* Octal escapes do not undergo character set conversion, so
1640 keep the escape sequence for later. */
1652 obstack_grow_str (output, "\\");
1654 i < 3 && isdigit (*tokptr) && *tokptr != '8' && *tokptr != '9';
1658 obstack_1grow (output, *tokptr);
1664 /* We handle UCNs later. We could handle them here, but that
1665 would mean a spurious error in the case where the UCN could
1666 be converted to the target charset but not the host
1672 int i, len = c == 'U' ? 8 : 4;
1675 obstack_1grow (output, '\\');
1676 obstack_1grow (output, *tokptr);
1679 if (!isxdigit (*tokptr))
1680 error (_("\\%c escape without a following hex digit"), c);
1681 for (i = 0; i < len && isxdigit (*tokptr); ++i)
1684 obstack_1grow (output, *tokptr);
1690 /* We must pass backslash through so that it does not
1691 cause quoting during the second expansion. */
1694 obstack_grow_str (output, "\\\\");
1698 /* Escapes which undergo conversion. */
1701 obstack_1grow (output, '\a');
1706 obstack_1grow (output, '\b');
1711 obstack_1grow (output, '\f');
1716 obstack_1grow (output, '\n');
1721 obstack_1grow (output, '\r');
1726 obstack_1grow (output, '\t');
1731 obstack_1grow (output, '\v');
1735 /* GCC extension. */
1738 obstack_1grow (output, HOST_ESCAPE_CHAR);
1742 /* Backslash-newline expands to nothing at all. */
1748 /* A few escapes just expand to the character itself. */
1752 /* GCC extensions. */
1757 /* Unrecognized escapes turn into the character itself. */
1760 obstack_1grow (output, *tokptr);
1768 /* Parse a string or character literal from TOKPTR. The string or
1769 character may be wide or unicode. *OUTPTR is set to just after the
1770 end of the literal in the input string. The resulting token is
1771 stored in VALUE. This returns a token value, either STRING or
1772 CHAR, depending on what was parsed. *HOST_CHARS is set to the
1773 number of host characters in the literal. */
1775 parse_string_or_char (char *tokptr, char **outptr, struct typed_stoken *value,
1779 enum c_string_type type;
1781 /* Build the gdb internal form of the input string in tempbuf. Note
1782 that the buffer is null byte terminated *only* for the
1783 convenience of debugging gdb itself and printing the buffer
1784 contents when the buffer contains no embedded nulls. Gdb does
1785 not depend upon the buffer being null byte terminated, it uses
1786 the length string instead. This allows gdb to handle C strings
1787 (as well as strings in other languages) with embedded null
1793 obstack_free (&tempbuf, NULL);
1794 obstack_init (&tempbuf);
1796 /* Record the string type. */
1799 type = C_WIDE_STRING;
1802 else if (*tokptr == 'u')
1807 else if (*tokptr == 'U')
1815 /* Skip the quote. */
1829 *host_chars += c_parse_escape (&tokptr, &tempbuf);
1831 else if (c == quote)
1835 obstack_1grow (&tempbuf, c);
1837 /* FIXME: this does the wrong thing with multi-byte host
1838 characters. We could use mbrlen here, but that would
1839 make "set host-charset" a bit less useful. */
1844 if (*tokptr != quote)
1847 error ("Unterminated string in expression.");
1849 error ("Unmatched single quote.");
1854 value->ptr = obstack_base (&tempbuf);
1855 value->length = obstack_object_size (&tempbuf);
1859 return quote == '"' ? STRING : CHAR;
1866 enum exp_opcode opcode;
1870 static const struct token tokentab3[] =
1872 {">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
1873 {"<<=", ASSIGN_MODIFY, BINOP_LSH, 0},
1874 {"->*", ARROW_STAR, BINOP_END, 1}
1877 static const struct token tokentab2[] =
1879 {"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
1880 {"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
1881 {"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
1882 {"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
1883 {"%=", ASSIGN_MODIFY, BINOP_REM, 0},
1884 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
1885 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
1886 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
1887 {"++", INCREMENT, BINOP_END, 0},
1888 {"--", DECREMENT, BINOP_END, 0},
1889 {"->", ARROW, BINOP_END, 0},
1890 {"&&", ANDAND, BINOP_END, 0},
1891 {"||", OROR, BINOP_END, 0},
1892 /* "::" is *not* only C++: gdb overrides its meaning in several
1893 different ways, e.g., 'filename'::func, function::variable. */
1894 {"::", COLONCOLON, BINOP_END, 0},
1895 {"<<", LSH, BINOP_END, 0},
1896 {">>", RSH, BINOP_END, 0},
1897 {"==", EQUAL, BINOP_END, 0},
1898 {"!=", NOTEQUAL, BINOP_END, 0},
1899 {"<=", LEQ, BINOP_END, 0},
1900 {">=", GEQ, BINOP_END, 0},
1901 {".*", DOT_STAR, BINOP_END, 1}
1904 /* Identifier-like tokens. */
1905 static const struct token ident_tokens[] =
1907 {"unsigned", UNSIGNED, OP_NULL, 0},
1908 {"template", TEMPLATE, OP_NULL, 1},
1909 {"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
1910 {"struct", STRUCT, OP_NULL, 0},
1911 {"signed", SIGNED_KEYWORD, OP_NULL, 0},
1912 {"sizeof", SIZEOF, OP_NULL, 0},
1913 {"double", DOUBLE_KEYWORD, OP_NULL, 0},
1914 {"false", FALSEKEYWORD, OP_NULL, 1},
1915 {"class", CLASS, OP_NULL, 1},
1916 {"union", UNION, OP_NULL, 0},
1917 {"short", SHORT, OP_NULL, 0},
1918 {"const", CONST_KEYWORD, OP_NULL, 0},
1919 {"enum", ENUM, OP_NULL, 0},
1920 {"long", LONG, OP_NULL, 0},
1921 {"true", TRUEKEYWORD, OP_NULL, 1},
1922 {"int", INT_KEYWORD, OP_NULL, 0},
1923 {"new", NEW, OP_NULL, 1},
1924 {"delete", DELETE, OP_NULL, 1},
1925 {"operator", OPERATOR, OP_NULL, 1},
1927 {"and", ANDAND, BINOP_END, 1},
1928 {"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, 1},
1929 {"bitand", '&', OP_NULL, 1},
1930 {"bitor", '|', OP_NULL, 1},
1931 {"compl", '~', OP_NULL, 1},
1932 {"not", '!', OP_NULL, 1},
1933 {"not_eq", NOTEQUAL, BINOP_END, 1},
1934 {"or", OROR, BINOP_END, 1},
1935 {"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 1},
1936 {"xor", '^', OP_NULL, 1},
1937 {"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 1},
1939 {"const_cast", CONST_CAST, OP_NULL, 1 },
1940 {"dynamic_cast", DYNAMIC_CAST, OP_NULL, 1 },
1941 {"static_cast", STATIC_CAST, OP_NULL, 1 },
1942 {"reinterpret_cast", REINTERPRET_CAST, OP_NULL, 1 }
1945 /* When we find that lexptr (the global var defined in parse.c) is
1946 pointing at a macro invocation, we expand the invocation, and call
1947 scan_macro_expansion to save the old lexptr here and point lexptr
1948 into the expanded text. When we reach the end of that, we call
1949 end_macro_expansion to pop back to the value we saved here. The
1950 macro expansion code promises to return only fully-expanded text,
1951 so we don't need to "push" more than one level.
1953 This is disgusting, of course. It would be cleaner to do all macro
1954 expansion beforehand, and then hand that to lexptr. But we don't
1955 really know where the expression ends. Remember, in a command like
1957 (gdb) break *ADDRESS if CONDITION
1959 we evaluate ADDRESS in the scope of the current frame, but we
1960 evaluate CONDITION in the scope of the breakpoint's location. So
1961 it's simply wrong to try to macro-expand the whole thing at once. */
1962 static char *macro_original_text;
1964 /* We save all intermediate macro expansions on this obstack for the
1965 duration of a single parse. The expansion text may sometimes have
1966 to live past the end of the expansion, due to yacc lookahead.
1967 Rather than try to be clever about saving the data for a single
1968 token, we simply keep it all and delete it after parsing has
1970 static struct obstack expansion_obstack;
1973 scan_macro_expansion (char *expansion)
1977 /* We'd better not be trying to push the stack twice. */
1978 gdb_assert (! macro_original_text);
1980 /* Copy to the obstack, and then free the intermediate
1982 copy = obstack_copy0 (&expansion_obstack, expansion, strlen (expansion));
1985 /* Save the old lexptr value, so we can return to it when we're done
1986 parsing the expanded text. */
1987 macro_original_text = lexptr;
1993 scanning_macro_expansion (void)
1995 return macro_original_text != 0;
2000 finished_macro_expansion (void)
2002 /* There'd better be something to pop back to. */
2003 gdb_assert (macro_original_text);
2005 /* Pop back to the original text. */
2006 lexptr = macro_original_text;
2007 macro_original_text = 0;
2012 scan_macro_cleanup (void *dummy)
2014 if (macro_original_text)
2015 finished_macro_expansion ();
2017 obstack_free (&expansion_obstack, NULL);
2020 /* Return true iff the token represents a C++ cast operator. */
2023 is_cast_operator (const char *token, int len)
2025 return (! strncmp (token, "dynamic_cast", len)
2026 || ! strncmp (token, "static_cast", len)
2027 || ! strncmp (token, "reinterpret_cast", len)
2028 || ! strncmp (token, "const_cast", len));
2031 /* The scope used for macro expansion. */
2032 static struct macro_scope *expression_macro_scope;
2034 /* This is set if a NAME token appeared at the very end of the input
2035 string, with no whitespace separating the name from the EOF. This
2036 is used only when parsing to do field name completion. */
2037 static int saw_name_at_eof;
2039 /* This is set if the previously-returned token was a structure
2040 operator -- either '.' or ARROW. This is used only when parsing to
2041 do field name completion. */
2042 static int last_was_structop;
2044 /* Read one token, getting characters through lexptr. */
2047 lex_one_token (void)
2053 int saw_structop = last_was_structop;
2056 last_was_structop = 0;
2060 /* Check if this is a macro invocation that we need to expand. */
2061 if (! scanning_macro_expansion ())
2063 char *expanded = macro_expand_next (&lexptr,
2064 standard_macro_lookup,
2065 expression_macro_scope);
2068 scan_macro_expansion (expanded);
2071 prev_lexptr = lexptr;
2074 /* See if it is a special token of length 3. */
2075 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
2076 if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
2078 if (tokentab3[i].cxx_only
2079 && parse_language->la_language != language_cplus)
2083 yylval.opcode = tokentab3[i].opcode;
2084 return tokentab3[i].token;
2087 /* See if it is a special token of length 2. */
2088 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
2089 if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
2091 if (tokentab2[i].cxx_only
2092 && parse_language->la_language != language_cplus)
2096 yylval.opcode = tokentab2[i].opcode;
2097 if (in_parse_field && tokentab2[i].token == ARROW)
2098 last_was_structop = 1;
2099 return tokentab2[i].token;
2102 switch (c = *tokstart)
2105 /* If we were just scanning the result of a macro expansion,
2106 then we need to resume scanning the original text.
2107 If we're parsing for field name completion, and the previous
2108 token allows such completion, return a COMPLETE token.
2109 Otherwise, we were already scanning the original text, and
2110 we're really done. */
2111 if (scanning_macro_expansion ())
2113 finished_macro_expansion ();
2116 else if (saw_name_at_eof)
2118 saw_name_at_eof = 0;
2121 else if (saw_structop)
2140 if (paren_depth == 0)
2147 if (comma_terminates
2149 && ! scanning_macro_expansion ())
2155 /* Might be a floating point number. */
2156 if (lexptr[1] < '0' || lexptr[1] > '9')
2159 last_was_structop = 1;
2160 goto symbol; /* Nope, must be a symbol. */
2162 /* FALL THRU into number case. */
2175 /* It's a number. */
2176 int got_dot = 0, got_e = 0, toktype;
2178 int hex = input_radix > 10;
2180 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
2185 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
2193 /* This test includes !hex because 'e' is a valid hex digit
2194 and thus does not indicate a floating point number when
2195 the radix is hex. */
2196 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
2197 got_dot = got_e = 1;
2198 /* This test does not include !hex, because a '.' always indicates
2199 a decimal floating point number regardless of the radix. */
2200 else if (!got_dot && *p == '.')
2202 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
2203 && (*p == '-' || *p == '+'))
2204 /* This is the sign of the exponent, not the end of the
2207 /* We will take any letters or digits. parse_number will
2208 complain if past the radix, or if L or U are not final. */
2209 else if ((*p < '0' || *p > '9')
2210 && ((*p < 'a' || *p > 'z')
2211 && (*p < 'A' || *p > 'Z')))
2214 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
2215 if (toktype == ERROR)
2217 char *err_copy = (char *) alloca (p - tokstart + 1);
2219 memcpy (err_copy, tokstart, p - tokstart);
2220 err_copy[p - tokstart] = 0;
2221 error ("Invalid number \"%s\".", err_copy);
2252 if (tokstart[1] != '"' && tokstart[1] != '\'')
2259 int result = parse_string_or_char (tokstart, &lexptr, &yylval.tsval,
2264 error ("Empty character constant.");
2265 else if (host_len > 2 && c == '\'')
2268 namelen = lexptr - tokstart - 1;
2271 else if (host_len > 1)
2272 error ("Invalid character constant.");
2278 if (!(c == '_' || c == '$'
2279 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
2280 /* We must have come across a bad character (e.g. ';'). */
2281 error ("Invalid character '%c' in expression.", c);
2283 /* It's a name. See how long it is. */
2285 for (c = tokstart[namelen];
2286 (c == '_' || c == '$' || (c >= '0' && c <= '9')
2287 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
2289 /* Template parameter lists are part of the name.
2290 FIXME: This mishandles `print $a<4&&$a>3'. */
2294 if (! is_cast_operator (tokstart, namelen))
2296 /* Scan ahead to get rest of the template specification. Note
2297 that we look ahead only when the '<' adjoins non-whitespace
2298 characters; for comparison expressions, e.g. "a < b > c",
2299 there must be spaces before the '<', etc. */
2301 char * p = find_template_name_end (tokstart + namelen);
2303 namelen = p - tokstart;
2307 c = tokstart[++namelen];
2310 /* The token "if" terminates the expression and is NOT removed from
2311 the input stream. It doesn't count if it appears in the
2312 expansion of a macro. */
2314 && tokstart[0] == 'i'
2315 && tokstart[1] == 'f'
2316 && ! scanning_macro_expansion ())
2321 /* For the same reason (breakpoint conditions), "thread N"
2322 terminates the expression. "thread" could be an identifier, but
2323 an identifier is never followed by a number without intervening
2324 punctuation. "task" is similar. Handle abbreviations of these,
2325 similarly to breakpoint.c:find_condition_and_thread. */
2327 && (strncmp (tokstart, "thread", namelen) == 0
2328 || strncmp (tokstart, "task", namelen) == 0)
2329 && (tokstart[namelen] == ' ' || tokstart[namelen] == '\t')
2330 && ! scanning_macro_expansion ())
2332 char *p = tokstart + namelen + 1;
2333 while (*p == ' ' || *p == '\t')
2335 if (*p >= '0' && *p <= '9')
2343 yylval.sval.ptr = tokstart;
2344 yylval.sval.length = namelen;
2346 /* Catch specific keywords. */
2347 copy = copy_name (yylval.sval);
2348 for (i = 0; i < sizeof ident_tokens / sizeof ident_tokens[0]; i++)
2349 if (strcmp (copy, ident_tokens[i].operator) == 0)
2351 if (ident_tokens[i].cxx_only
2352 && parse_language->la_language != language_cplus)
2355 /* It is ok to always set this, even though we don't always
2356 strictly need to. */
2357 yylval.opcode = ident_tokens[i].opcode;
2358 return ident_tokens[i].token;
2361 if (*tokstart == '$')
2364 if (in_parse_field && *lexptr == '\0')
2365 saw_name_at_eof = 1;
2369 /* An object of this type is pushed on a FIFO by the "outer" lexer. */
2376 DEF_VEC_O (token_and_value);
2378 /* A FIFO of tokens that have been read but not yet returned to the
2380 static VEC (token_and_value) *token_fifo;
2382 /* Non-zero if the lexer should return tokens from the FIFO. */
2385 /* Temporary storage for c_lex; this holds symbol names as they are
2387 static struct obstack name_obstack;
2389 /* Classify a NAME token. The contents of the token are in `yylval'.
2390 Updates yylval and returns the new token type. BLOCK is the block
2391 in which lookups start; this can be NULL to mean the global
2394 classify_name (struct block *block)
2398 int is_a_field_of_this = 0;
2400 copy = copy_name (yylval.sval);
2402 sym = lookup_symbol (copy, block, VAR_DOMAIN,
2403 parse_language->la_language == language_cplus
2404 ? &is_a_field_of_this : (int *) NULL);
2406 if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
2408 yylval.ssym.sym = sym;
2409 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2414 /* See if it's a file name. */
2415 struct symtab *symtab;
2417 symtab = lookup_symtab (copy);
2420 yylval.bval = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), STATIC_BLOCK);
2425 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
2427 yylval.tsym.type = SYMBOL_TYPE (sym);
2432 = language_lookup_primitive_type_by_name (parse_language,
2433 parse_gdbarch, copy);
2434 if (yylval.tsym.type != NULL)
2437 /* Input names that aren't symbols but ARE valid hex numbers, when
2438 the input radix permits them, can be names or numbers depending
2439 on the parse. Note we support radixes > 16 here. */
2441 && ((copy[0] >= 'a' && copy[0] < 'a' + input_radix - 10)
2442 || (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10)))
2444 YYSTYPE newlval; /* Its value is ignored. */
2445 int hextype = parse_number (copy, yylval.sval.length, 0, &newlval);
2448 yylval.ssym.sym = sym;
2449 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2454 /* Any other kind of symbol */
2455 yylval.ssym.sym = sym;
2456 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2459 && parse_language->la_language == language_cplus
2460 && !is_a_field_of_this
2461 && !lookup_minimal_symbol (copy, NULL, NULL))
2462 return UNKNOWN_CPP_NAME;
2467 /* Like classify_name, but used by the inner loop of the lexer, when a
2468 name might have already been seen. FIRST_NAME is true if the token
2469 in `yylval' is the first component of a name, false otherwise. If
2470 this function returns NAME, it might not have updated `yylval'.
2471 This is ok because the caller only cares about TYPENAME. */
2473 classify_inner_name (struct block *block, int first_name)
2475 struct type *type, *new_type;
2479 return classify_name (block);
2481 type = check_typedef (yylval.tsym.type);
2482 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
2483 && TYPE_CODE (type) != TYPE_CODE_UNION
2484 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
2485 /* We know the caller won't expect us to update yylval. */
2488 copy = copy_name (yylval.tsym.stoken);
2489 new_type = cp_lookup_nested_type (type, copy, block);
2491 if (new_type == NULL)
2492 /* We know the caller won't expect us to update yylval. */
2495 yylval.tsym.type = new_type;
2499 /* The outer level of a two-level lexer. This calls the inner lexer
2500 to return tokens. It then either returns these tokens, or
2501 aggregates them into a larger token. This lets us work around a
2502 problem in our parsing approach, where the parser could not
2503 distinguish between qualified names and qualified types at the
2506 This approach is still not ideal, because it mishandles template
2507 types. See the comment in lex_one_token for an example. However,
2508 this is still an improvement over the earlier approach, and will
2509 suffice until we move to better parsing technology. */
2513 token_and_value current;
2514 int first_was_coloncolon, last_was_coloncolon, first_iter;
2516 if (popping && !VEC_empty (token_and_value, token_fifo))
2518 token_and_value tv = *VEC_index (token_and_value, token_fifo, 0);
2519 VEC_ordered_remove (token_and_value, token_fifo, 0);
2525 current.token = lex_one_token ();
2526 if (current.token == NAME)
2527 current.token = classify_name (expression_context_block);
2528 if (parse_language->la_language != language_cplus
2529 || (current.token != TYPENAME && current.token != COLONCOLON))
2530 return current.token;
2532 first_was_coloncolon = current.token == COLONCOLON;
2533 last_was_coloncolon = first_was_coloncolon;
2534 obstack_free (&name_obstack, obstack_base (&name_obstack));
2535 if (!last_was_coloncolon)
2536 obstack_grow (&name_obstack, yylval.sval.ptr, yylval.sval.length);
2537 current.value = yylval;
2541 token_and_value next;
2543 next.token = lex_one_token ();
2544 next.value = yylval;
2546 if (next.token == NAME && last_was_coloncolon)
2550 classification = classify_inner_name (first_was_coloncolon
2552 : expression_context_block,
2554 /* We keep going until we either run out of names, or until
2555 we have a qualified name which is not a type. */
2556 if (classification != TYPENAME)
2558 /* Push the final component and leave the loop. */
2559 VEC_safe_push (token_and_value, token_fifo, &next);
2563 /* Update the partial name we are constructing. */
2566 /* We don't want to put a leading "::" into the name. */
2567 obstack_grow_str (&name_obstack, "::");
2569 obstack_grow (&name_obstack, next.value.sval.ptr,
2570 next.value.sval.length);
2572 yylval.sval.ptr = obstack_base (&name_obstack);
2573 yylval.sval.length = obstack_object_size (&name_obstack);
2574 current.value = yylval;
2575 current.token = classification;
2577 last_was_coloncolon = 0;
2579 else if (next.token == COLONCOLON && !last_was_coloncolon)
2580 last_was_coloncolon = 1;
2583 /* We've reached the end of the name. */
2584 VEC_safe_push (token_and_value, token_fifo, &next);
2593 /* If we ended with a "::", insert it too. */
2594 if (last_was_coloncolon)
2597 memset (&cc, 0, sizeof (token_and_value));
2598 if (first_was_coloncolon && first_iter)
2603 cc.token = COLONCOLON;
2604 VEC_safe_insert (token_and_value, token_fifo, 0, &cc);
2607 yylval = current.value;
2608 yylval.sval.ptr = obstack_copy0 (&expansion_obstack,
2610 yylval.sval.length);
2611 return current.token;
2618 struct cleanup *back_to = make_cleanup (free_current_contents,
2619 &expression_macro_scope);
2621 /* Set up the scope for macro expansion. */
2622 expression_macro_scope = NULL;
2624 if (expression_context_block)
2625 expression_macro_scope
2626 = sal_macro_scope (find_pc_line (expression_context_pc, 0));
2628 expression_macro_scope = default_macro_scope ();
2629 if (! expression_macro_scope)
2630 expression_macro_scope = user_macro_scope ();
2632 /* Initialize macro expansion code. */
2633 obstack_init (&expansion_obstack);
2634 gdb_assert (! macro_original_text);
2635 make_cleanup (scan_macro_cleanup, 0);
2637 make_cleanup_restore_integer (&yydebug);
2638 yydebug = parser_debug;
2640 /* Initialize some state used by the lexer. */
2641 last_was_structop = 0;
2642 saw_name_at_eof = 0;
2644 VEC_free (token_and_value, token_fifo);
2646 obstack_init (&name_obstack);
2647 make_cleanup_obstack_free (&name_obstack);
2649 result = yyparse ();
2650 do_cleanups (back_to);
2659 lexptr = prev_lexptr;
2661 error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);