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
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 *);
162 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
164 %type <tval> type typebase qualified_type
165 %type <tvec> nonempty_typelist
166 /* %type <bval> block */
168 /* Fancy type parsing. */
169 %type <voidval> func_mod direct_abs_decl abs_decl
171 %type <lval> array_mod
173 %token <typed_val_int> INT
174 %token <typed_val_float> FLOAT
175 %token <typed_val_decfloat> DECFLOAT
177 /* Both NAME and TYPENAME tokens represent symbols in the input,
178 and both convey their data as strings.
179 But a TYPENAME is a string that happens to be defined as a typedef
180 or builtin type name (such as int or char)
181 and a NAME is any other symbol.
182 Contexts where this distinction is not important can use the
183 nonterminal "name", which matches either NAME or TYPENAME. */
185 %token <tsval> STRING
187 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
188 %token <voidval> COMPLETE
189 %token <tsym> TYPENAME
191 %type <svec> string_exp
192 %type <ssym> name_not_typename
193 %type <tsym> typename
195 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
196 but which would parse as a valid number in the current input radix.
197 E.g. "c" when input_radix==16. Depending on the parse, it will be
198 turned into a name or into a number. */
200 %token <ssym> NAME_OR_INT
202 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
206 /* Special type cases, put in to allow the parser to distinguish different
208 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
210 %token <voidval> VARIABLE
212 %token <opcode> ASSIGN_MODIFY
221 %right '=' ASSIGN_MODIFY
229 %left '<' '>' LEQ GEQ
234 %right UNARY INCREMENT DECREMENT
235 %right ARROW '.' '[' '('
236 %token <ssym> BLOCKNAME
237 %token <bval> FILENAME
249 { write_exp_elt_opcode(OP_TYPE);
250 write_exp_elt_type($1);
251 write_exp_elt_opcode(OP_TYPE);}
254 /* Expressions, including the comma operator. */
257 { write_exp_elt_opcode (BINOP_COMMA); }
260 /* Expressions, not including the comma operator. */
261 exp : '*' exp %prec UNARY
262 { write_exp_elt_opcode (UNOP_IND); }
265 exp : '&' exp %prec UNARY
266 { write_exp_elt_opcode (UNOP_ADDR); }
269 exp : '-' exp %prec UNARY
270 { write_exp_elt_opcode (UNOP_NEG); }
273 exp : '+' exp %prec UNARY
274 { write_exp_elt_opcode (UNOP_PLUS); }
277 exp : '!' exp %prec UNARY
278 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
281 exp : '~' exp %prec UNARY
282 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
285 exp : INCREMENT exp %prec UNARY
286 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
289 exp : DECREMENT exp %prec UNARY
290 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
293 exp : exp INCREMENT %prec UNARY
294 { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
297 exp : exp DECREMENT %prec UNARY
298 { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
301 exp : SIZEOF exp %prec UNARY
302 { write_exp_elt_opcode (UNOP_SIZEOF); }
306 { write_exp_elt_opcode (STRUCTOP_PTR);
307 write_exp_string ($3);
308 write_exp_elt_opcode (STRUCTOP_PTR); }
311 exp : exp ARROW name COMPLETE
312 { mark_struct_expression ();
313 write_exp_elt_opcode (STRUCTOP_PTR);
314 write_exp_string ($3);
315 write_exp_elt_opcode (STRUCTOP_PTR); }
318 exp : exp ARROW COMPLETE
320 mark_struct_expression ();
321 write_exp_elt_opcode (STRUCTOP_PTR);
324 write_exp_string (s);
325 write_exp_elt_opcode (STRUCTOP_PTR); }
328 exp : exp ARROW qualified_name
329 { /* exp->type::name becomes exp->*(&type::name) */
330 /* Note: this doesn't work if name is a
331 static member! FIXME */
332 write_exp_elt_opcode (UNOP_ADDR);
333 write_exp_elt_opcode (STRUCTOP_MPTR); }
336 exp : exp ARROW '*' exp
337 { write_exp_elt_opcode (STRUCTOP_MPTR); }
341 { write_exp_elt_opcode (STRUCTOP_STRUCT);
342 write_exp_string ($3);
343 write_exp_elt_opcode (STRUCTOP_STRUCT); }
346 exp : exp '.' name COMPLETE
347 { mark_struct_expression ();
348 write_exp_elt_opcode (STRUCTOP_STRUCT);
349 write_exp_string ($3);
350 write_exp_elt_opcode (STRUCTOP_STRUCT); }
353 exp : exp '.' COMPLETE
355 mark_struct_expression ();
356 write_exp_elt_opcode (STRUCTOP_STRUCT);
359 write_exp_string (s);
360 write_exp_elt_opcode (STRUCTOP_STRUCT); }
363 exp : exp '.' qualified_name
364 { /* exp.type::name becomes exp.*(&type::name) */
365 /* Note: this doesn't work if name is a
366 static member! FIXME */
367 write_exp_elt_opcode (UNOP_ADDR);
368 write_exp_elt_opcode (STRUCTOP_MEMBER); }
371 exp : exp '.' '*' exp
372 { write_exp_elt_opcode (STRUCTOP_MEMBER); }
375 exp : exp '[' exp1 ']'
376 { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
380 /* This is to save the value of arglist_len
381 being accumulated by an outer function call. */
382 { start_arglist (); }
383 arglist ')' %prec ARROW
384 { write_exp_elt_opcode (OP_FUNCALL);
385 write_exp_elt_longcst ((LONGEST) end_arglist ());
386 write_exp_elt_opcode (OP_FUNCALL); }
390 { start_arglist (); }
400 arglist : arglist ',' exp %prec ABOVE_COMMA
405 { $$ = end_arglist () - 1; }
407 exp : lcurly arglist rcurly %prec ARROW
408 { write_exp_elt_opcode (OP_ARRAY);
409 write_exp_elt_longcst ((LONGEST) 0);
410 write_exp_elt_longcst ((LONGEST) $3);
411 write_exp_elt_opcode (OP_ARRAY); }
414 exp : lcurly type rcurly exp %prec UNARY
415 { write_exp_elt_opcode (UNOP_MEMVAL);
416 write_exp_elt_type ($2);
417 write_exp_elt_opcode (UNOP_MEMVAL); }
420 exp : '(' type ')' exp %prec UNARY
421 { write_exp_elt_opcode (UNOP_CAST);
422 write_exp_elt_type ($2);
423 write_exp_elt_opcode (UNOP_CAST); }
430 /* Binary operators in order of decreasing precedence. */
433 { write_exp_elt_opcode (BINOP_REPEAT); }
437 { write_exp_elt_opcode (BINOP_MUL); }
441 { write_exp_elt_opcode (BINOP_DIV); }
445 { write_exp_elt_opcode (BINOP_REM); }
449 { write_exp_elt_opcode (BINOP_ADD); }
453 { write_exp_elt_opcode (BINOP_SUB); }
457 { write_exp_elt_opcode (BINOP_LSH); }
461 { write_exp_elt_opcode (BINOP_RSH); }
465 { write_exp_elt_opcode (BINOP_EQUAL); }
468 exp : exp NOTEQUAL exp
469 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
473 { write_exp_elt_opcode (BINOP_LEQ); }
477 { write_exp_elt_opcode (BINOP_GEQ); }
481 { write_exp_elt_opcode (BINOP_LESS); }
485 { write_exp_elt_opcode (BINOP_GTR); }
489 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
493 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
497 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
501 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
505 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
508 exp : exp '?' exp ':' exp %prec '?'
509 { write_exp_elt_opcode (TERNOP_COND); }
513 { write_exp_elt_opcode (BINOP_ASSIGN); }
516 exp : exp ASSIGN_MODIFY exp
517 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
518 write_exp_elt_opcode ($2);
519 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
523 { write_exp_elt_opcode (OP_LONG);
524 write_exp_elt_type ($1.type);
525 write_exp_elt_longcst ((LONGEST)($1.val));
526 write_exp_elt_opcode (OP_LONG); }
531 struct stoken_vector vec;
534 write_exp_string_vector ($1.type, &vec);
540 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
541 write_exp_elt_opcode (OP_LONG);
542 write_exp_elt_type (val.typed_val_int.type);
543 write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
544 write_exp_elt_opcode (OP_LONG);
550 { write_exp_elt_opcode (OP_DOUBLE);
551 write_exp_elt_type ($1.type);
552 write_exp_elt_dblcst ($1.dval);
553 write_exp_elt_opcode (OP_DOUBLE); }
557 { write_exp_elt_opcode (OP_DECFLOAT);
558 write_exp_elt_type ($1.type);
559 write_exp_elt_decfloatcst ($1.val);
560 write_exp_elt_opcode (OP_DECFLOAT); }
567 /* Already written by write_dollar_variable. */
570 exp : SIZEOF '(' type ')' %prec UNARY
571 { write_exp_elt_opcode (OP_LONG);
572 write_exp_elt_type (parse_type->builtin_int);
574 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
575 write_exp_elt_opcode (OP_LONG); }
581 /* We copy the string here, and not in the
582 lexer, to guarantee that we do not leak a
583 string. Note that we follow the
584 NUL-termination convention of the
586 struct typed_stoken *vec = XNEW (struct typed_stoken);
591 vec->length = $1.length;
592 vec->ptr = malloc ($1.length + 1);
593 memcpy (vec->ptr, $1.ptr, $1.length + 1);
598 /* Note that we NUL-terminate here, but just
602 $$.tokens = realloc ($$.tokens,
603 $$.len * sizeof (struct typed_stoken));
605 p = malloc ($2.length + 1);
606 memcpy (p, $2.ptr, $2.length + 1);
608 $$.tokens[$$.len - 1].type = $2.type;
609 $$.tokens[$$.len - 1].length = $2.length;
610 $$.tokens[$$.len - 1].ptr = p;
617 enum c_string_type type = C_STRING;
619 for (i = 0; i < $1.len; ++i)
621 switch ($1.tokens[i].type)
629 && type != $1.tokens[i].type)
630 error ("Undefined string concatenation.");
631 type = $1.tokens[i].type;
635 internal_error (__FILE__, __LINE__,
636 "unrecognized type in string concatenation");
640 write_exp_string_vector (type, &$1);
641 for (i = 0; i < $1.len; ++i)
642 free ($1.tokens[i].ptr);
649 { write_exp_elt_opcode (OP_LONG);
650 write_exp_elt_type (parse_type->builtin_bool);
651 write_exp_elt_longcst ((LONGEST) 1);
652 write_exp_elt_opcode (OP_LONG); }
656 { write_exp_elt_opcode (OP_LONG);
657 write_exp_elt_type (parse_type->builtin_bool);
658 write_exp_elt_longcst ((LONGEST) 0);
659 write_exp_elt_opcode (OP_LONG); }
667 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
669 error ("No file or function \"%s\".",
670 copy_name ($1.stoken));
678 block : block COLONCOLON name
680 = lookup_symbol (copy_name ($3), $1,
681 VAR_DOMAIN, (int *) NULL);
682 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
683 error ("No function \"%s\" in specified context.",
685 $$ = SYMBOL_BLOCK_VALUE (tem); }
688 variable: block COLONCOLON name
689 { struct symbol *sym;
690 sym = lookup_symbol (copy_name ($3), $1,
691 VAR_DOMAIN, (int *) NULL);
693 error ("No symbol \"%s\" in specified context.",
696 write_exp_elt_opcode (OP_VAR_VALUE);
697 /* block_found is set by lookup_symbol. */
698 write_exp_elt_block (block_found);
699 write_exp_elt_sym (sym);
700 write_exp_elt_opcode (OP_VAR_VALUE); }
703 qualified_name: typebase COLONCOLON name
705 struct type *type = $1;
706 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
707 && TYPE_CODE (type) != TYPE_CODE_UNION
708 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
709 error ("`%s' is not defined as an aggregate type.",
712 write_exp_elt_opcode (OP_SCOPE);
713 write_exp_elt_type (type);
714 write_exp_string ($3);
715 write_exp_elt_opcode (OP_SCOPE);
717 | typebase COLONCOLON '~' name
719 struct type *type = $1;
720 struct stoken tmp_token;
721 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
722 && TYPE_CODE (type) != TYPE_CODE_UNION
723 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
724 error ("`%s' is not defined as an aggregate type.",
727 tmp_token.ptr = (char*) alloca ($4.length + 2);
728 tmp_token.length = $4.length + 1;
729 tmp_token.ptr[0] = '~';
730 memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
731 tmp_token.ptr[tmp_token.length] = 0;
733 /* Check for valid destructor name. */
734 destructor_name_p (tmp_token.ptr, type);
735 write_exp_elt_opcode (OP_SCOPE);
736 write_exp_elt_type (type);
737 write_exp_string (tmp_token);
738 write_exp_elt_opcode (OP_SCOPE);
742 variable: qualified_name
745 char *name = copy_name ($2);
747 struct minimal_symbol *msymbol;
750 lookup_symbol (name, (const struct block *) NULL,
751 VAR_DOMAIN, (int *) NULL);
754 write_exp_elt_opcode (OP_VAR_VALUE);
755 write_exp_elt_block (NULL);
756 write_exp_elt_sym (sym);
757 write_exp_elt_opcode (OP_VAR_VALUE);
761 msymbol = lookup_minimal_symbol (name, NULL, NULL);
763 write_exp_msymbol (msymbol);
764 else if (!have_full_symbols () && !have_partial_symbols ())
765 error ("No symbol table is loaded. Use the \"file\" command.");
767 error ("No symbol \"%s\" in current context.", name);
771 variable: name_not_typename
772 { struct symbol *sym = $1.sym;
776 if (symbol_read_needs_frame (sym))
778 if (innermost_block == 0 ||
779 contained_in (block_found,
781 innermost_block = block_found;
784 write_exp_elt_opcode (OP_VAR_VALUE);
785 /* We want to use the selected frame, not
786 another more inner frame which happens to
787 be in the same block. */
788 write_exp_elt_block (NULL);
789 write_exp_elt_sym (sym);
790 write_exp_elt_opcode (OP_VAR_VALUE);
792 else if ($1.is_a_field_of_this)
794 /* C++: it hangs off of `this'. Must
795 not inadvertently convert from a method call
797 if (innermost_block == 0 ||
798 contained_in (block_found, innermost_block))
799 innermost_block = block_found;
800 write_exp_elt_opcode (OP_THIS);
801 write_exp_elt_opcode (OP_THIS);
802 write_exp_elt_opcode (STRUCTOP_PTR);
803 write_exp_string ($1.stoken);
804 write_exp_elt_opcode (STRUCTOP_PTR);
808 struct minimal_symbol *msymbol;
809 char *arg = copy_name ($1.stoken);
812 lookup_minimal_symbol (arg, NULL, NULL);
814 write_exp_msymbol (msymbol);
815 else if (!have_full_symbols () && !have_partial_symbols ())
816 error ("No symbol table is loaded. Use the \"file\" command.");
818 error ("No symbol \"%s\" in current context.",
819 copy_name ($1.stoken));
824 space_identifier : '@' NAME
825 { push_type_address_space (copy_name ($2.stoken));
826 push_type (tp_space_identifier);
830 const_or_volatile: const_or_volatile_noopt
834 cv_with_space_id : const_or_volatile space_identifier const_or_volatile
837 const_or_volatile_or_space_identifier_noopt: cv_with_space_id
838 | const_or_volatile_noopt
841 const_or_volatile_or_space_identifier:
842 const_or_volatile_or_space_identifier_noopt
847 { push_type (tp_pointer); $$ = 0; }
849 { push_type (tp_pointer); $$ = $2; }
851 { push_type (tp_reference); $$ = 0; }
853 { push_type (tp_reference); $$ = $2; }
857 direct_abs_decl: '(' abs_decl ')'
859 | direct_abs_decl array_mod
862 push_type (tp_array);
867 push_type (tp_array);
871 | direct_abs_decl func_mod
872 { push_type (tp_function); }
874 { push_type (tp_function); }
885 | '(' nonempty_typelist ')'
886 { free ($2); $$ = 0; }
889 /* We used to try to recognize pointer to member types here, but
890 that didn't work (shift/reduce conflicts meant that these rules never
891 got executed). The problem is that
892 int (foo::bar::baz::bizzle)
893 is a function type but
894 int (foo::bar::baz::bizzle::*)
895 is a pointer to member type. Stroustrup loses again! */
900 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
904 { $$ = parse_type->builtin_int; }
906 { $$ = parse_type->builtin_long; }
908 { $$ = parse_type->builtin_short; }
910 { $$ = parse_type->builtin_long; }
911 | LONG SIGNED_KEYWORD INT_KEYWORD
912 { $$ = parse_type->builtin_long; }
913 | LONG SIGNED_KEYWORD
914 { $$ = parse_type->builtin_long; }
915 | SIGNED_KEYWORD LONG INT_KEYWORD
916 { $$ = parse_type->builtin_long; }
917 | UNSIGNED LONG INT_KEYWORD
918 { $$ = parse_type->builtin_unsigned_long; }
919 | LONG UNSIGNED INT_KEYWORD
920 { $$ = parse_type->builtin_unsigned_long; }
922 { $$ = parse_type->builtin_unsigned_long; }
924 { $$ = parse_type->builtin_long_long; }
925 | LONG LONG INT_KEYWORD
926 { $$ = parse_type->builtin_long_long; }
927 | LONG LONG SIGNED_KEYWORD INT_KEYWORD
928 { $$ = parse_type->builtin_long_long; }
929 | LONG LONG SIGNED_KEYWORD
930 { $$ = parse_type->builtin_long_long; }
931 | SIGNED_KEYWORD LONG LONG
932 { $$ = parse_type->builtin_long_long; }
933 | SIGNED_KEYWORD LONG LONG INT_KEYWORD
934 { $$ = parse_type->builtin_long_long; }
936 { $$ = parse_type->builtin_unsigned_long_long; }
937 | UNSIGNED LONG LONG INT_KEYWORD
938 { $$ = parse_type->builtin_unsigned_long_long; }
940 { $$ = parse_type->builtin_unsigned_long_long; }
941 | LONG LONG UNSIGNED INT_KEYWORD
942 { $$ = parse_type->builtin_unsigned_long_long; }
944 { $$ = parse_type->builtin_short; }
945 | SHORT SIGNED_KEYWORD INT_KEYWORD
946 { $$ = parse_type->builtin_short; }
947 | SHORT SIGNED_KEYWORD
948 { $$ = parse_type->builtin_short; }
949 | UNSIGNED SHORT INT_KEYWORD
950 { $$ = parse_type->builtin_unsigned_short; }
952 { $$ = parse_type->builtin_unsigned_short; }
953 | SHORT UNSIGNED INT_KEYWORD
954 { $$ = parse_type->builtin_unsigned_short; }
956 { $$ = parse_type->builtin_double; }
957 | LONG DOUBLE_KEYWORD
958 { $$ = parse_type->builtin_long_double; }
960 { $$ = lookup_struct (copy_name ($2),
961 expression_context_block); }
963 { $$ = lookup_struct (copy_name ($2),
964 expression_context_block); }
966 { $$ = lookup_union (copy_name ($2),
967 expression_context_block); }
969 { $$ = lookup_enum (copy_name ($2),
970 expression_context_block); }
972 { $$ = lookup_unsigned_typename (TYPE_NAME($2.type)); }
974 { $$ = parse_type->builtin_unsigned_int; }
975 | SIGNED_KEYWORD typename
976 { $$ = lookup_signed_typename (TYPE_NAME($2.type)); }
978 { $$ = parse_type->builtin_int; }
979 /* It appears that this rule for templates is never
980 reduced; template recognition happens by lookahead
981 in the token processing code in yylex. */
982 | TEMPLATE name '<' type '>'
983 { $$ = lookup_template_type(copy_name($2), $4,
984 expression_context_block);
986 | const_or_volatile_or_space_identifier_noopt typebase
987 { $$ = follow_types ($2); }
988 | typebase const_or_volatile_or_space_identifier_noopt
989 { $$ = follow_types ($1); }
993 /* FIXME: carlton/2003-09-25: This next bit leads to lots of
994 reduce-reduce conflicts, because the parser doesn't know whether or
995 not to use qualified_name or qualified_type: the rules are
996 identical. If the parser is parsing 'A::B::x', then, when it sees
997 the second '::', it knows that the expression to the left of it has
998 to be a type, so it uses qualified_type. But if it is parsing just
999 'A::B', then it doesn't have any way of knowing which rule to use,
1000 so there's a reduce-reduce conflict; it picks qualified_name, since
1001 that occurs earlier in this file than qualified_type.
1003 There's no good way to fix this with the grammar as it stands; as
1004 far as I can tell, some of the problems arise from ambiguities that
1005 GDB introduces ('start' can be either an expression or a type), but
1006 some of it is inherent to the nature of C++ (you want to treat the
1007 input "(FOO)" fairly differently depending on whether FOO is an
1008 expression or a type, and if FOO is a complex expression, this can
1009 be hard to determine at the right time). Fortunately, it works
1010 pretty well in most cases. For example, if you do 'ptype A::B',
1011 where A::B is a nested type, then the parser will mistakenly
1012 misidentify it as an expression; but evaluate_subexp will get
1013 called with 'noside' set to EVAL_AVOID_SIDE_EFFECTS, and everything
1014 will work out anyways. But there are situations where the parser
1015 will get confused: the most common one that I've run into is when
1018 print *((A::B *) x)"
1020 where the parser doesn't realize that A::B has to be a type until
1021 it hits the first right paren, at which point it's too late. (The
1022 workaround is to type "print *(('A::B' *) x)" instead.) (And
1023 another solution is to fix our symbol-handling code so that the
1024 user never wants to type something like that in the first place,
1025 because we get all the types right without the user's help!)
1027 Perhaps we could fix this by making the lexer smarter. Some of
1028 this functionality used to be in the lexer, but in a way that
1029 worked even less well than the current solution: that attempt
1030 involved having the parser sometimes handle '::' and having the
1031 lexer sometimes handle it, and without a clear division of
1032 responsibility, it quickly degenerated into a big mess. Probably
1033 the eventual correct solution will give more of a role to the lexer
1034 (ideally via code that is shared between the lexer and
1035 decode_line_1), but I'm not holding my breath waiting for somebody
1036 to get around to cleaning this up... */
1038 qualified_type: typebase COLONCOLON name
1040 struct type *type = $1;
1041 struct type *new_type;
1042 char *ncopy = alloca ($3.length + 1);
1044 memcpy (ncopy, $3.ptr, $3.length);
1045 ncopy[$3.length] = '\0';
1047 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
1048 && TYPE_CODE (type) != TYPE_CODE_UNION
1049 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
1050 error ("`%s' is not defined as an aggregate type.",
1053 new_type = cp_lookup_nested_type (type, ncopy,
1054 expression_context_block);
1055 if (new_type == NULL)
1056 error ("No type \"%s\" within class or namespace \"%s\".",
1057 ncopy, TYPE_NAME (type));
1066 $$.stoken.ptr = "int";
1067 $$.stoken.length = 3;
1068 $$.type = parse_type->builtin_int;
1072 $$.stoken.ptr = "long";
1073 $$.stoken.length = 4;
1074 $$.type = parse_type->builtin_long;
1078 $$.stoken.ptr = "short";
1079 $$.stoken.length = 5;
1080 $$.type = parse_type->builtin_short;
1086 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
1087 $<ivec>$[0] = 1; /* Number of types in vector */
1090 | nonempty_typelist ',' type
1091 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
1092 $$ = (struct type **) realloc ((char *) $1, len);
1093 $$[$<ivec>$[0]] = $3;
1098 | ptype const_or_volatile_or_space_identifier abs_decl const_or_volatile_or_space_identifier
1099 { $$ = follow_types ($1); }
1102 const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
1103 | VOLATILE_KEYWORD CONST_KEYWORD
1106 const_or_volatile_noopt: const_and_volatile
1107 { push_type (tp_const);
1108 push_type (tp_volatile);
1111 { push_type (tp_const); }
1113 { push_type (tp_volatile); }
1116 name : NAME { $$ = $1.stoken; }
1117 | BLOCKNAME { $$ = $1.stoken; }
1118 | TYPENAME { $$ = $1.stoken; }
1119 | NAME_OR_INT { $$ = $1.stoken; }
1122 name_not_typename : NAME
1124 /* These would be useful if name_not_typename was useful, but it is just
1125 a fake for "variable", so these cause reduce/reduce conflicts because
1126 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
1127 =exp) or just an exp. If name_not_typename was ever used in an lvalue
1128 context where only a name could occur, this might be useful.
1135 /* Take care of parsing a number (anything that starts with a digit).
1136 Set yylval and return the token type; update lexptr.
1137 LEN is the number of characters in it. */
1139 /*** Needs some error checking for the float case ***/
1142 parse_number (char *p, int len, int parsed_float, YYSTYPE *putithere)
1144 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
1145 here, and we do kind of silly things like cast to unsigned. */
1152 int base = input_radix;
1155 /* Number of "L" suffixes encountered. */
1158 /* We have found a "L" or "U" suffix. */
1159 int found_suffix = 0;
1162 struct type *signed_type;
1163 struct type *unsigned_type;
1167 /* It's a float since it contains a point or an exponent. */
1169 int num; /* number of tokens scanned by scanf */
1172 /* If it ends at "df", "dd" or "dl", take it as type of decimal floating
1173 point. Return DECFLOAT. */
1175 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
1178 putithere->typed_val_decfloat.type
1179 = parse_type->builtin_decfloat;
1180 decimal_from_string (putithere->typed_val_decfloat.val, 4, p);
1185 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
1188 putithere->typed_val_decfloat.type
1189 = parse_type->builtin_decdouble;
1190 decimal_from_string (putithere->typed_val_decfloat.val, 8, p);
1195 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
1198 putithere->typed_val_decfloat.type
1199 = parse_type->builtin_declong;
1200 decimal_from_string (putithere->typed_val_decfloat.val, 16, p);
1206 saved_char = p[len];
1207 p[len] = 0; /* null-terminate the token */
1208 num = sscanf (p, "%" DOUBLEST_SCAN_FORMAT "%s",
1209 &putithere->typed_val_float.dval, s);
1210 p[len] = saved_char; /* restore the input stream */
1213 putithere->typed_val_float.type =
1214 parse_type->builtin_double;
1218 /* See if it has any float suffix: 'f' for float, 'l' for long
1220 if (!strcasecmp (s, "f"))
1221 putithere->typed_val_float.type =
1222 parse_type->builtin_float;
1223 else if (!strcasecmp (s, "l"))
1224 putithere->typed_val_float.type =
1225 parse_type->builtin_long_double;
1237 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1271 if (c >= 'A' && c <= 'Z')
1273 if (c != 'l' && c != 'u')
1275 if (c >= '0' && c <= '9')
1283 if (base > 10 && c >= 'a' && c <= 'f')
1287 n += i = c - 'a' + 10;
1300 return ERROR; /* Char not a digit */
1303 return ERROR; /* Invalid digit in this base */
1305 /* Portably test for overflow (only works for nonzero values, so make
1306 a second check for zero). FIXME: Can't we just make n and prevn
1307 unsigned and avoid this? */
1308 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1309 unsigned_p = 1; /* Try something unsigned */
1311 /* Portably test for unsigned overflow.
1312 FIXME: This check is wrong; for example it doesn't find overflow
1313 on 0x123456789 when LONGEST is 32 bits. */
1314 if (c != 'l' && c != 'u' && n != 0)
1316 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
1317 error ("Numeric constant too large.");
1322 /* An integer constant is an int, a long, or a long long. An L
1323 suffix forces it to be long; an LL suffix forces it to be long
1324 long. If not forced to a larger size, it gets the first type of
1325 the above that it fits in. To figure out whether it fits, we
1326 shift it right and see whether anything remains. Note that we
1327 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1328 operation, because many compilers will warn about such a shift
1329 (which always produces a zero result). Sometimes gdbarch_int_bit
1330 or gdbarch_long_bit will be that big, sometimes not. To deal with
1331 the case where it is we just always shift the value more than
1332 once, with fewer bits each time. */
1334 un = (ULONGEST)n >> 2;
1336 && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
1338 high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
1340 /* A large decimal (not hex or octal) constant (between INT_MAX
1341 and UINT_MAX) is a long or unsigned long, according to ANSI,
1342 never an unsigned int, but this code treats it as unsigned
1343 int. This probably should be fixed. GCC gives a warning on
1346 unsigned_type = parse_type->builtin_unsigned_int;
1347 signed_type = parse_type->builtin_int;
1349 else if (long_p <= 1
1350 && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
1352 high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
1353 unsigned_type = parse_type->builtin_unsigned_long;
1354 signed_type = parse_type->builtin_long;
1359 if (sizeof (ULONGEST) * HOST_CHAR_BIT
1360 < gdbarch_long_long_bit (parse_gdbarch))
1361 /* A long long does not fit in a LONGEST. */
1362 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1364 shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
1365 high_bit = (ULONGEST) 1 << shift;
1366 unsigned_type = parse_type->builtin_unsigned_long_long;
1367 signed_type = parse_type->builtin_long_long;
1370 putithere->typed_val_int.val = n;
1372 /* If the high bit of the worked out type is set then this number
1373 has to be unsigned. */
1375 if (unsigned_p || (n & high_bit))
1377 putithere->typed_val_int.type = unsigned_type;
1381 putithere->typed_val_int.type = signed_type;
1387 /* Temporary obstack used for holding strings. */
1388 static struct obstack tempbuf;
1389 static int tempbuf_init;
1391 /* Parse a C escape sequence. The initial backslash of the sequence
1392 is at (*PTR)[-1]. *PTR will be updated to point to just after the
1393 last character of the sequence. If OUTPUT is not NULL, the
1394 translated form of the escape sequence will be written there. If
1395 OUTPUT is NULL, no output is written and the call will only affect
1396 *PTR. If an escape sequence is expressed in target bytes, then the
1397 entire sequence will simply be copied to OUTPUT. Return 1 if any
1398 character was emitted, 0 otherwise. */
1401 c_parse_escape (char **ptr, struct obstack *output)
1403 char *tokptr = *ptr;
1406 /* Some escape sequences undergo character set conversion. Those we
1410 /* Hex escapes do not undergo character set conversion, so keep
1411 the escape sequence for later. */
1414 obstack_grow_str (output, "\\x");
1416 if (!isxdigit (*tokptr))
1417 error (_("\\x escape without a following hex digit"));
1418 while (isxdigit (*tokptr))
1421 obstack_1grow (output, *tokptr);
1426 /* Octal escapes do not undergo character set conversion, so
1427 keep the escape sequence for later. */
1437 obstack_grow_str (output, "\\");
1438 while (isdigit (*tokptr) && *tokptr != '8' && *tokptr != '9')
1441 obstack_1grow (output, *tokptr);
1446 /* We handle UCNs later. We could handle them here, but that
1447 would mean a spurious error in the case where the UCN could
1448 be converted to the target charset but not the host
1454 int i, len = c == 'U' ? 8 : 4;
1457 obstack_1grow (output, '\\');
1458 obstack_1grow (output, *tokptr);
1461 if (!isxdigit (*tokptr))
1462 error (_("\\%c escape without a following hex digit"), c);
1463 for (i = 0; i < len && isxdigit (*tokptr); ++i)
1466 obstack_1grow (output, *tokptr);
1472 /* We must pass backslash through so that it does not
1473 cause quoting during the second expansion. */
1476 obstack_grow_str (output, "\\\\");
1480 /* Escapes which undergo conversion. */
1483 obstack_1grow (output, '\a');
1488 obstack_1grow (output, '\b');
1493 obstack_1grow (output, '\f');
1498 obstack_1grow (output, '\n');
1503 obstack_1grow (output, '\r');
1508 obstack_1grow (output, '\t');
1513 obstack_1grow (output, '\v');
1517 /* GCC extension. */
1520 obstack_1grow (output, HOST_ESCAPE_CHAR);
1524 /* Backslash-newline expands to nothing at all. */
1530 /* A few escapes just expand to the character itself. */
1534 /* GCC extensions. */
1539 /* Unrecognized escapes turn into the character itself. */
1542 obstack_1grow (output, *tokptr);
1550 /* Parse a string or character literal from TOKPTR. The string or
1551 character may be wide or unicode. *OUTPTR is set to just after the
1552 end of the literal in the input string. The resulting token is
1553 stored in VALUE. This returns a token value, either STRING or
1554 CHAR, depending on what was parsed. *HOST_CHARS is set to the
1555 number of host characters in the literal. */
1557 parse_string_or_char (char *tokptr, char **outptr, struct typed_stoken *value,
1561 enum c_string_type type;
1563 /* Build the gdb internal form of the input string in tempbuf. Note
1564 that the buffer is null byte terminated *only* for the
1565 convenience of debugging gdb itself and printing the buffer
1566 contents when the buffer contains no embedded nulls. Gdb does
1567 not depend upon the buffer being null byte terminated, it uses
1568 the length string instead. This allows gdb to handle C strings
1569 (as well as strings in other languages) with embedded null
1575 obstack_free (&tempbuf, NULL);
1576 obstack_init (&tempbuf);
1578 /* Record the string type. */
1581 type = C_WIDE_STRING;
1584 else if (*tokptr == 'u')
1589 else if (*tokptr == 'U')
1597 /* Skip the quote. */
1611 *host_chars += c_parse_escape (&tokptr, &tempbuf);
1613 else if (c == quote)
1617 obstack_1grow (&tempbuf, c);
1619 /* FIXME: this does the wrong thing with multi-byte host
1620 characters. We could use mbrlen here, but that would
1621 make "set host-charset" a bit less useful. */
1626 if (*tokptr != quote)
1629 error ("Unterminated string in expression.");
1631 error ("Unmatched single quote.");
1636 value->ptr = obstack_base (&tempbuf);
1637 value->length = obstack_object_size (&tempbuf);
1641 return quote == '"' ? STRING : CHAR;
1648 enum exp_opcode opcode;
1652 static const struct token tokentab3[] =
1654 {">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
1655 {"<<=", ASSIGN_MODIFY, BINOP_LSH, 0}
1658 static const struct token tokentab2[] =
1660 {"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
1661 {"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
1662 {"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
1663 {"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
1664 {"%=", ASSIGN_MODIFY, BINOP_REM, 0},
1665 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
1666 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
1667 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
1668 {"++", INCREMENT, BINOP_END, 0},
1669 {"--", DECREMENT, BINOP_END, 0},
1670 {"->", ARROW, BINOP_END, 0},
1671 {"&&", ANDAND, BINOP_END, 0},
1672 {"||", OROR, BINOP_END, 0},
1673 {"::", COLONCOLON, BINOP_END, 0},
1674 {"<<", LSH, BINOP_END, 0},
1675 {">>", RSH, BINOP_END, 0},
1676 {"==", EQUAL, BINOP_END, 0},
1677 {"!=", NOTEQUAL, BINOP_END, 0},
1678 {"<=", LEQ, BINOP_END, 0},
1679 {">=", GEQ, BINOP_END, 0}
1682 /* Identifier-like tokens. */
1683 static const struct token ident_tokens[] =
1685 {"unsigned", UNSIGNED, OP_NULL, 0},
1686 {"template", TEMPLATE, OP_NULL, 1},
1687 {"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
1688 {"struct", STRUCT, OP_NULL, 0},
1689 {"signed", SIGNED_KEYWORD, OP_NULL, 0},
1690 {"sizeof", SIZEOF, OP_NULL, 0},
1691 {"double", DOUBLE_KEYWORD, OP_NULL, 0},
1692 {"false", FALSEKEYWORD, OP_NULL, 1},
1693 {"class", CLASS, OP_NULL, 1},
1694 {"union", UNION, OP_NULL, 0},
1695 {"short", SHORT, OP_NULL, 0},
1696 {"const", CONST_KEYWORD, OP_NULL, 0},
1697 {"enum", ENUM, OP_NULL, 0},
1698 {"long", LONG, OP_NULL, 0},
1699 {"true", TRUEKEYWORD, OP_NULL, 1},
1700 {"int", INT_KEYWORD, OP_NULL, 0},
1702 {"and", ANDAND, BINOP_END, 1},
1703 {"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, 1},
1704 {"bitand", '&', OP_NULL, 1},
1705 {"bitor", '|', OP_NULL, 1},
1706 {"compl", '~', OP_NULL, 1},
1707 {"not", '!', OP_NULL, 1},
1708 {"not_eq", NOTEQUAL, BINOP_END, 1},
1709 {"or", OROR, BINOP_END, 1},
1710 {"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 1},
1711 {"xor", '^', OP_NULL, 1},
1712 {"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 1}
1715 /* When we find that lexptr (the global var defined in parse.c) is
1716 pointing at a macro invocation, we expand the invocation, and call
1717 scan_macro_expansion to save the old lexptr here and point lexptr
1718 into the expanded text. When we reach the end of that, we call
1719 end_macro_expansion to pop back to the value we saved here. The
1720 macro expansion code promises to return only fully-expanded text,
1721 so we don't need to "push" more than one level.
1723 This is disgusting, of course. It would be cleaner to do all macro
1724 expansion beforehand, and then hand that to lexptr. But we don't
1725 really know where the expression ends. Remember, in a command like
1727 (gdb) break *ADDRESS if CONDITION
1729 we evaluate ADDRESS in the scope of the current frame, but we
1730 evaluate CONDITION in the scope of the breakpoint's location. So
1731 it's simply wrong to try to macro-expand the whole thing at once. */
1732 static char *macro_original_text;
1734 /* We save all intermediate macro expansions on this obstack for the
1735 duration of a single parse. The expansion text may sometimes have
1736 to live past the end of the expansion, due to yacc lookahead.
1737 Rather than try to be clever about saving the data for a single
1738 token, we simply keep it all and delete it after parsing has
1740 static struct obstack expansion_obstack;
1743 scan_macro_expansion (char *expansion)
1747 /* We'd better not be trying to push the stack twice. */
1748 gdb_assert (! macro_original_text);
1750 /* Copy to the obstack, and then free the intermediate
1752 copy = obstack_copy0 (&expansion_obstack, expansion, strlen (expansion));
1755 /* Save the old lexptr value, so we can return to it when we're done
1756 parsing the expanded text. */
1757 macro_original_text = lexptr;
1763 scanning_macro_expansion (void)
1765 return macro_original_text != 0;
1770 finished_macro_expansion (void)
1772 /* There'd better be something to pop back to. */
1773 gdb_assert (macro_original_text);
1775 /* Pop back to the original text. */
1776 lexptr = macro_original_text;
1777 macro_original_text = 0;
1782 scan_macro_cleanup (void *dummy)
1784 if (macro_original_text)
1785 finished_macro_expansion ();
1787 obstack_free (&expansion_obstack, NULL);
1791 /* The scope used for macro expansion. */
1792 static struct macro_scope *expression_macro_scope;
1794 /* This is set if a NAME token appeared at the very end of the input
1795 string, with no whitespace separating the name from the EOF. This
1796 is used only when parsing to do field name completion. */
1797 static int saw_name_at_eof;
1799 /* This is set if the previously-returned token was a structure
1800 operator -- either '.' or ARROW. This is used only when parsing to
1801 do field name completion. */
1802 static int last_was_structop;
1804 /* Read one token, getting characters through lexptr. */
1813 int saw_structop = last_was_structop;
1816 last_was_structop = 0;
1820 /* Check if this is a macro invocation that we need to expand. */
1821 if (! scanning_macro_expansion ())
1823 char *expanded = macro_expand_next (&lexptr,
1824 standard_macro_lookup,
1825 expression_macro_scope);
1828 scan_macro_expansion (expanded);
1831 prev_lexptr = lexptr;
1834 /* See if it is a special token of length 3. */
1835 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
1836 if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
1839 yylval.opcode = tokentab3[i].opcode;
1840 return tokentab3[i].token;
1843 /* See if it is a special token of length 2. */
1844 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
1845 if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
1848 yylval.opcode = tokentab2[i].opcode;
1849 if (in_parse_field && tokentab2[i].token == ARROW)
1850 last_was_structop = 1;
1851 return tokentab2[i].token;
1854 switch (c = *tokstart)
1857 /* If we were just scanning the result of a macro expansion,
1858 then we need to resume scanning the original text.
1859 If we're parsing for field name completion, and the previous
1860 token allows such completion, return a COMPLETE token.
1861 Otherwise, we were already scanning the original text, and
1862 we're really done. */
1863 if (scanning_macro_expansion ())
1865 finished_macro_expansion ();
1868 else if (saw_name_at_eof)
1870 saw_name_at_eof = 0;
1873 else if (saw_structop)
1892 if (paren_depth == 0)
1899 if (comma_terminates
1901 && ! scanning_macro_expansion ())
1907 /* Might be a floating point number. */
1908 if (lexptr[1] < '0' || lexptr[1] > '9')
1911 last_was_structop = 1;
1912 goto symbol; /* Nope, must be a symbol. */
1914 /* FALL THRU into number case. */
1927 /* It's a number. */
1928 int got_dot = 0, got_e = 0, toktype;
1930 int hex = input_radix > 10;
1932 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1937 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1945 /* This test includes !hex because 'e' is a valid hex digit
1946 and thus does not indicate a floating point number when
1947 the radix is hex. */
1948 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1949 got_dot = got_e = 1;
1950 /* This test does not include !hex, because a '.' always indicates
1951 a decimal floating point number regardless of the radix. */
1952 else if (!got_dot && *p == '.')
1954 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1955 && (*p == '-' || *p == '+'))
1956 /* This is the sign of the exponent, not the end of the
1959 /* We will take any letters or digits. parse_number will
1960 complain if past the radix, or if L or U are not final. */
1961 else if ((*p < '0' || *p > '9')
1962 && ((*p < 'a' || *p > 'z')
1963 && (*p < 'A' || *p > 'Z')))
1966 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
1967 if (toktype == ERROR)
1969 char *err_copy = (char *) alloca (p - tokstart + 1);
1971 memcpy (err_copy, tokstart, p - tokstart);
1972 err_copy[p - tokstart] = 0;
1973 error ("Invalid number \"%s\".", err_copy);
2004 if (tokstart[1] != '"' && tokstart[1] != '\'')
2011 int result = parse_string_or_char (tokstart, &lexptr, &yylval.tsval,
2016 error ("Empty character constant.");
2017 else if (host_len > 2 && c == '\'')
2020 namelen = lexptr - tokstart - 1;
2023 else if (host_len > 1)
2024 error ("Invalid character constant.");
2030 if (!(c == '_' || c == '$'
2031 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
2032 /* We must have come across a bad character (e.g. ';'). */
2033 error ("Invalid character '%c' in expression.", c);
2035 /* It's a name. See how long it is. */
2037 for (c = tokstart[namelen];
2038 (c == '_' || c == '$' || (c >= '0' && c <= '9')
2039 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
2041 /* Template parameter lists are part of the name.
2042 FIXME: This mishandles `print $a<4&&$a>3'. */
2046 /* Scan ahead to get rest of the template specification. Note
2047 that we look ahead only when the '<' adjoins non-whitespace
2048 characters; for comparison expressions, e.g. "a < b > c",
2049 there must be spaces before the '<', etc. */
2051 char * p = find_template_name_end (tokstart + namelen);
2053 namelen = p - tokstart;
2056 c = tokstart[++namelen];
2059 /* The token "if" terminates the expression and is NOT removed from
2060 the input stream. It doesn't count if it appears in the
2061 expansion of a macro. */
2063 && tokstart[0] == 'i'
2064 && tokstart[1] == 'f'
2065 && ! scanning_macro_expansion ())
2074 yylval.sval.ptr = tokstart;
2075 yylval.sval.length = namelen;
2077 /* Catch specific keywords. */
2078 copy = copy_name (yylval.sval);
2079 for (i = 0; i < sizeof ident_tokens / sizeof ident_tokens[0]; i++)
2080 if (strcmp (copy, ident_tokens[i].operator) == 0)
2082 if (ident_tokens[i].cxx_only
2083 && parse_language->la_language != language_cplus)
2086 /* It is ok to always set this, even though we don't always
2087 strictly need to. */
2088 yylval.opcode = ident_tokens[i].opcode;
2089 return ident_tokens[i].token;
2092 if (*tokstart == '$')
2094 write_dollar_variable (yylval.sval);
2098 /* Use token-type BLOCKNAME for symbols that happen to be defined as
2099 functions or symtabs. If this is not so, then ...
2100 Use token-type TYPENAME for symbols that happen to be defined
2101 currently as names of types; NAME for other symbols.
2102 The caller is not constrained to care about the distinction. */
2105 int is_a_field_of_this = 0;
2108 sym = lookup_symbol (copy, expression_context_block,
2110 parse_language->la_language == language_cplus
2111 ? &is_a_field_of_this : (int *) NULL);
2112 /* Call lookup_symtab, not lookup_partial_symtab, in case there are
2113 no psymtabs (coff, xcoff, or some future change to blow away the
2114 psymtabs once once symbols are read). */
2115 if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
2117 yylval.ssym.sym = sym;
2118 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2122 { /* See if it's a file name. */
2123 struct symtab *symtab;
2125 symtab = lookup_symtab (copy);
2129 yylval.bval = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), STATIC_BLOCK);
2134 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
2136 /* NOTE: carlton/2003-09-25: There used to be code here to
2137 handle nested types. It didn't work very well. See the
2138 comment before qualified_type for more info. */
2139 yylval.tsym.type = SYMBOL_TYPE (sym);
2143 = language_lookup_primitive_type_by_name (parse_language,
2144 parse_gdbarch, copy);
2145 if (yylval.tsym.type != NULL)
2148 /* Input names that aren't symbols but ARE valid hex numbers,
2149 when the input radix permits them, can be names or numbers
2150 depending on the parse. Note we support radixes > 16 here. */
2152 ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
2153 (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
2155 YYSTYPE newlval; /* Its value is ignored. */
2156 hextype = parse_number (tokstart, namelen, 0, &newlval);
2159 yylval.ssym.sym = sym;
2160 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2165 /* Any other kind of symbol */
2166 yylval.ssym.sym = sym;
2167 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2168 if (in_parse_field && *lexptr == '\0')
2169 saw_name_at_eof = 1;
2178 struct cleanup *back_to = make_cleanup (free_current_contents,
2179 &expression_macro_scope);
2181 /* Set up the scope for macro expansion. */
2182 expression_macro_scope = NULL;
2184 if (expression_context_block)
2185 expression_macro_scope
2186 = sal_macro_scope (find_pc_line (expression_context_pc, 0));
2188 expression_macro_scope = default_macro_scope ();
2189 if (! expression_macro_scope)
2190 expression_macro_scope = user_macro_scope ();
2192 /* Initialize macro expansion code. */
2193 obstack_init (&expansion_obstack);
2194 gdb_assert (! macro_original_text);
2195 make_cleanup (scan_macro_cleanup, 0);
2197 /* Initialize some state used by the lexer. */
2198 last_was_structop = 0;
2199 saw_name_at_eof = 0;
2201 result = yyparse ();
2202 do_cleanups (back_to);
2211 lexptr = prev_lexptr;
2213 error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);