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 qualified_type
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 <voidval> COMPLETE
190 %token <tsym> TYPENAME
192 %type <svec> string_exp
193 %type <ssym> name_not_typename
194 %type <tsym> typename
196 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
197 but which would parse as a valid number in the current input radix.
198 E.g. "c" when input_radix==16. Depending on the parse, it will be
199 turned into a name or into a number. */
201 %token <ssym> NAME_OR_INT
204 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
208 %type <sval> operator
209 %token REINTERPRET_CAST DYNAMIC_CAST STATIC_CAST CONST_CAST
211 /* Special type cases, put in to allow the parser to distinguish different
213 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
215 %token <voidval> VARIABLE
217 %token <opcode> ASSIGN_MODIFY
226 %right '=' ASSIGN_MODIFY
234 %left '<' '>' LEQ GEQ
239 %right UNARY INCREMENT DECREMENT
240 %right ARROW ARROW_STAR '.' DOT_STAR '[' '('
241 %token <ssym> BLOCKNAME
242 %token <bval> FILENAME
254 { write_exp_elt_opcode(OP_TYPE);
255 write_exp_elt_type($1);
256 write_exp_elt_opcode(OP_TYPE);}
259 /* Expressions, including the comma operator. */
262 { write_exp_elt_opcode (BINOP_COMMA); }
265 /* Expressions, not including the comma operator. */
266 exp : '*' exp %prec UNARY
267 { write_exp_elt_opcode (UNOP_IND); }
270 exp : '&' exp %prec UNARY
271 { write_exp_elt_opcode (UNOP_ADDR); }
274 exp : '-' exp %prec UNARY
275 { write_exp_elt_opcode (UNOP_NEG); }
278 exp : '+' exp %prec UNARY
279 { write_exp_elt_opcode (UNOP_PLUS); }
282 exp : '!' exp %prec UNARY
283 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
286 exp : '~' exp %prec UNARY
287 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
290 exp : INCREMENT exp %prec UNARY
291 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
294 exp : DECREMENT exp %prec UNARY
295 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
298 exp : exp INCREMENT %prec UNARY
299 { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
302 exp : exp DECREMENT %prec UNARY
303 { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
306 exp : SIZEOF exp %prec UNARY
307 { write_exp_elt_opcode (UNOP_SIZEOF); }
311 { write_exp_elt_opcode (STRUCTOP_PTR);
312 write_exp_string ($3);
313 write_exp_elt_opcode (STRUCTOP_PTR); }
316 exp : exp ARROW name COMPLETE
317 { mark_struct_expression ();
318 write_exp_elt_opcode (STRUCTOP_PTR);
319 write_exp_string ($3);
320 write_exp_elt_opcode (STRUCTOP_PTR); }
323 exp : exp ARROW COMPLETE
325 mark_struct_expression ();
326 write_exp_elt_opcode (STRUCTOP_PTR);
329 write_exp_string (s);
330 write_exp_elt_opcode (STRUCTOP_PTR); }
333 exp : exp ARROW qualified_name
334 { /* exp->type::name becomes exp->*(&type::name) */
335 /* Note: this doesn't work if name is a
336 static member! FIXME */
337 write_exp_elt_opcode (UNOP_ADDR);
338 write_exp_elt_opcode (STRUCTOP_MPTR); }
341 exp : exp ARROW_STAR exp
342 { write_exp_elt_opcode (STRUCTOP_MPTR); }
346 { write_exp_elt_opcode (STRUCTOP_STRUCT);
347 write_exp_string ($3);
348 write_exp_elt_opcode (STRUCTOP_STRUCT); }
351 exp : exp '.' name COMPLETE
352 { mark_struct_expression ();
353 write_exp_elt_opcode (STRUCTOP_STRUCT);
354 write_exp_string ($3);
355 write_exp_elt_opcode (STRUCTOP_STRUCT); }
358 exp : exp '.' COMPLETE
360 mark_struct_expression ();
361 write_exp_elt_opcode (STRUCTOP_STRUCT);
364 write_exp_string (s);
365 write_exp_elt_opcode (STRUCTOP_STRUCT); }
368 exp : exp '.' qualified_name
369 { /* exp.type::name becomes exp.*(&type::name) */
370 /* Note: this doesn't work if name is a
371 static member! FIXME */
372 write_exp_elt_opcode (UNOP_ADDR);
373 write_exp_elt_opcode (STRUCTOP_MEMBER); }
376 exp : exp DOT_STAR exp
377 { write_exp_elt_opcode (STRUCTOP_MEMBER); }
380 exp : exp '[' exp1 ']'
381 { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
385 /* This is to save the value of arglist_len
386 being accumulated by an outer function call. */
387 { start_arglist (); }
388 arglist ')' %prec ARROW
389 { write_exp_elt_opcode (OP_FUNCALL);
390 write_exp_elt_longcst ((LONGEST) end_arglist ());
391 write_exp_elt_opcode (OP_FUNCALL); }
395 { start_arglist (); }
405 arglist : arglist ',' exp %prec ABOVE_COMMA
409 exp : exp '(' nonempty_typelist ')' const_or_volatile
411 write_exp_elt_opcode (TYPE_INSTANCE);
412 write_exp_elt_longcst ((LONGEST) $<ivec>3[0]);
413 for (i = 0; i < $<ivec>3[0]; ++i)
414 write_exp_elt_type ($<tvec>3[i + 1]);
415 write_exp_elt_longcst((LONGEST) $<ivec>3[0]);
416 write_exp_elt_opcode (TYPE_INSTANCE);
422 { $$ = end_arglist () - 1; }
424 exp : lcurly arglist rcurly %prec ARROW
425 { write_exp_elt_opcode (OP_ARRAY);
426 write_exp_elt_longcst ((LONGEST) 0);
427 write_exp_elt_longcst ((LONGEST) $3);
428 write_exp_elt_opcode (OP_ARRAY); }
431 exp : lcurly type rcurly exp %prec UNARY
432 { write_exp_elt_opcode (UNOP_MEMVAL);
433 write_exp_elt_type ($2);
434 write_exp_elt_opcode (UNOP_MEMVAL); }
437 exp : '(' type ')' exp %prec UNARY
438 { write_exp_elt_opcode (UNOP_CAST);
439 write_exp_elt_type ($2);
440 write_exp_elt_opcode (UNOP_CAST); }
447 /* Binary operators in order of decreasing precedence. */
450 { write_exp_elt_opcode (BINOP_REPEAT); }
454 { write_exp_elt_opcode (BINOP_MUL); }
458 { write_exp_elt_opcode (BINOP_DIV); }
462 { write_exp_elt_opcode (BINOP_REM); }
466 { write_exp_elt_opcode (BINOP_ADD); }
470 { write_exp_elt_opcode (BINOP_SUB); }
474 { write_exp_elt_opcode (BINOP_LSH); }
478 { write_exp_elt_opcode (BINOP_RSH); }
482 { write_exp_elt_opcode (BINOP_EQUAL); }
485 exp : exp NOTEQUAL exp
486 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
490 { write_exp_elt_opcode (BINOP_LEQ); }
494 { write_exp_elt_opcode (BINOP_GEQ); }
498 { write_exp_elt_opcode (BINOP_LESS); }
502 { write_exp_elt_opcode (BINOP_GTR); }
506 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
510 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
514 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
518 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
522 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
525 exp : exp '?' exp ':' exp %prec '?'
526 { write_exp_elt_opcode (TERNOP_COND); }
530 { write_exp_elt_opcode (BINOP_ASSIGN); }
533 exp : exp ASSIGN_MODIFY exp
534 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
535 write_exp_elt_opcode ($2);
536 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
540 { write_exp_elt_opcode (OP_LONG);
541 write_exp_elt_type ($1.type);
542 write_exp_elt_longcst ((LONGEST)($1.val));
543 write_exp_elt_opcode (OP_LONG); }
548 struct stoken_vector vec;
551 write_exp_string_vector ($1.type, &vec);
557 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
558 write_exp_elt_opcode (OP_LONG);
559 write_exp_elt_type (val.typed_val_int.type);
560 write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
561 write_exp_elt_opcode (OP_LONG);
567 { write_exp_elt_opcode (OP_DOUBLE);
568 write_exp_elt_type ($1.type);
569 write_exp_elt_dblcst ($1.dval);
570 write_exp_elt_opcode (OP_DOUBLE); }
574 { write_exp_elt_opcode (OP_DECFLOAT);
575 write_exp_elt_type ($1.type);
576 write_exp_elt_decfloatcst ($1.val);
577 write_exp_elt_opcode (OP_DECFLOAT); }
584 /* Already written by write_dollar_variable. */
587 exp : SIZEOF '(' type ')' %prec UNARY
588 { write_exp_elt_opcode (OP_LONG);
589 write_exp_elt_type (parse_type->builtin_int);
591 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
592 write_exp_elt_opcode (OP_LONG); }
595 exp : REINTERPRET_CAST '<' type '>' '(' exp ')' %prec UNARY
596 { write_exp_elt_opcode (UNOP_REINTERPRET_CAST);
597 write_exp_elt_type ($3);
598 write_exp_elt_opcode (UNOP_REINTERPRET_CAST); }
601 exp : STATIC_CAST '<' type '>' '(' exp ')' %prec UNARY
602 { write_exp_elt_opcode (UNOP_CAST);
603 write_exp_elt_type ($3);
604 write_exp_elt_opcode (UNOP_CAST); }
607 exp : DYNAMIC_CAST '<' type '>' '(' exp ')' %prec UNARY
608 { write_exp_elt_opcode (UNOP_DYNAMIC_CAST);
609 write_exp_elt_type ($3);
610 write_exp_elt_opcode (UNOP_DYNAMIC_CAST); }
613 exp : CONST_CAST '<' type '>' '(' exp ')' %prec UNARY
614 { /* We could do more error checking here, but
615 it doesn't seem worthwhile. */
616 write_exp_elt_opcode (UNOP_CAST);
617 write_exp_elt_type ($3);
618 write_exp_elt_opcode (UNOP_CAST); }
624 /* We copy the string here, and not in the
625 lexer, to guarantee that we do not leak a
626 string. Note that we follow the
627 NUL-termination convention of the
629 struct typed_stoken *vec = XNEW (struct typed_stoken);
634 vec->length = $1.length;
635 vec->ptr = malloc ($1.length + 1);
636 memcpy (vec->ptr, $1.ptr, $1.length + 1);
641 /* Note that we NUL-terminate here, but just
645 $$.tokens = realloc ($$.tokens,
646 $$.len * sizeof (struct typed_stoken));
648 p = malloc ($2.length + 1);
649 memcpy (p, $2.ptr, $2.length + 1);
651 $$.tokens[$$.len - 1].type = $2.type;
652 $$.tokens[$$.len - 1].length = $2.length;
653 $$.tokens[$$.len - 1].ptr = p;
660 enum c_string_type type = C_STRING;
662 for (i = 0; i < $1.len; ++i)
664 switch ($1.tokens[i].type)
672 && type != $1.tokens[i].type)
673 error ("Undefined string concatenation.");
674 type = $1.tokens[i].type;
678 internal_error (__FILE__, __LINE__,
679 "unrecognized type in string concatenation");
683 write_exp_string_vector (type, &$1);
684 for (i = 0; i < $1.len; ++i)
685 free ($1.tokens[i].ptr);
692 { write_exp_elt_opcode (OP_LONG);
693 write_exp_elt_type (parse_type->builtin_bool);
694 write_exp_elt_longcst ((LONGEST) 1);
695 write_exp_elt_opcode (OP_LONG); }
699 { write_exp_elt_opcode (OP_LONG);
700 write_exp_elt_type (parse_type->builtin_bool);
701 write_exp_elt_longcst ((LONGEST) 0);
702 write_exp_elt_opcode (OP_LONG); }
710 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
712 error ("No file or function \"%s\".",
713 copy_name ($1.stoken));
721 block : block COLONCOLON name
723 = lookup_symbol (copy_name ($3), $1,
724 VAR_DOMAIN, (int *) NULL);
725 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
726 error ("No function \"%s\" in specified context.",
728 $$ = SYMBOL_BLOCK_VALUE (tem); }
731 variable: block COLONCOLON name
732 { struct symbol *sym;
733 sym = lookup_symbol (copy_name ($3), $1,
734 VAR_DOMAIN, (int *) NULL);
736 error ("No symbol \"%s\" in specified context.",
739 write_exp_elt_opcode (OP_VAR_VALUE);
740 /* block_found is set by lookup_symbol. */
741 write_exp_elt_block (block_found);
742 write_exp_elt_sym (sym);
743 write_exp_elt_opcode (OP_VAR_VALUE); }
746 qualified_name: typebase COLONCOLON name
748 struct type *type = $1;
749 CHECK_TYPEDEF (type);
750 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
751 && TYPE_CODE (type) != TYPE_CODE_UNION
752 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
753 error ("`%s' is not defined as an aggregate type.",
756 write_exp_elt_opcode (OP_SCOPE);
757 write_exp_elt_type (type);
758 write_exp_string ($3);
759 write_exp_elt_opcode (OP_SCOPE);
761 | typebase COLONCOLON '~' name
763 struct type *type = $1;
764 struct stoken tmp_token;
765 CHECK_TYPEDEF (type);
766 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
767 && TYPE_CODE (type) != TYPE_CODE_UNION
768 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
769 error ("`%s' is not defined as an aggregate type.",
772 tmp_token.ptr = (char*) alloca ($4.length + 2);
773 tmp_token.length = $4.length + 1;
774 tmp_token.ptr[0] = '~';
775 memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
776 tmp_token.ptr[tmp_token.length] = 0;
778 /* Check for valid destructor name. */
779 destructor_name_p (tmp_token.ptr, type);
780 write_exp_elt_opcode (OP_SCOPE);
781 write_exp_elt_type (type);
782 write_exp_string (tmp_token);
783 write_exp_elt_opcode (OP_SCOPE);
787 variable: qualified_name
790 char *name = copy_name ($2);
792 struct minimal_symbol *msymbol;
795 lookup_symbol (name, (const struct block *) NULL,
796 VAR_DOMAIN, (int *) NULL);
799 write_exp_elt_opcode (OP_VAR_VALUE);
800 write_exp_elt_block (NULL);
801 write_exp_elt_sym (sym);
802 write_exp_elt_opcode (OP_VAR_VALUE);
806 msymbol = lookup_minimal_symbol (name, NULL, NULL);
808 write_exp_msymbol (msymbol);
809 else if (!have_full_symbols () && !have_partial_symbols ())
810 error ("No symbol table is loaded. Use the \"file\" command.");
812 error ("No symbol \"%s\" in current context.", name);
816 variable: name_not_typename
817 { struct symbol *sym = $1.sym;
821 if (symbol_read_needs_frame (sym))
823 if (innermost_block == 0
824 || contained_in (block_found,
826 innermost_block = block_found;
829 write_exp_elt_opcode (OP_VAR_VALUE);
830 /* We want to use the selected frame, not
831 another more inner frame which happens to
832 be in the same block. */
833 write_exp_elt_block (NULL);
834 write_exp_elt_sym (sym);
835 write_exp_elt_opcode (OP_VAR_VALUE);
837 else if ($1.is_a_field_of_this)
839 /* C++: it hangs off of `this'. Must
840 not inadvertently convert from a method call
842 if (innermost_block == 0
843 || contained_in (block_found,
845 innermost_block = block_found;
846 write_exp_elt_opcode (OP_THIS);
847 write_exp_elt_opcode (OP_THIS);
848 write_exp_elt_opcode (STRUCTOP_PTR);
849 write_exp_string ($1.stoken);
850 write_exp_elt_opcode (STRUCTOP_PTR);
854 struct minimal_symbol *msymbol;
855 char *arg = copy_name ($1.stoken);
858 lookup_minimal_symbol (arg, NULL, NULL);
860 write_exp_msymbol (msymbol);
861 else if (!have_full_symbols () && !have_partial_symbols ())
862 error ("No symbol table is loaded. Use the \"file\" command.");
864 error ("No symbol \"%s\" in current context.",
865 copy_name ($1.stoken));
870 space_identifier : '@' NAME
871 { push_type_address_space (copy_name ($2.stoken));
872 push_type (tp_space_identifier);
876 const_or_volatile: const_or_volatile_noopt
880 cv_with_space_id : const_or_volatile space_identifier const_or_volatile
883 const_or_volatile_or_space_identifier_noopt: cv_with_space_id
884 | const_or_volatile_noopt
887 const_or_volatile_or_space_identifier:
888 const_or_volatile_or_space_identifier_noopt
893 { push_type (tp_pointer); $$ = 0; }
895 { push_type (tp_pointer); $$ = $2; }
897 { push_type (tp_reference); $$ = 0; }
899 { push_type (tp_reference); $$ = $2; }
903 direct_abs_decl: '(' abs_decl ')'
905 | direct_abs_decl array_mod
908 push_type (tp_array);
913 push_type (tp_array);
917 | direct_abs_decl func_mod
918 { push_type (tp_function); }
920 { push_type (tp_function); }
931 | '(' nonempty_typelist ')'
932 { free ($2); $$ = 0; }
935 /* We used to try to recognize pointer to member types here, but
936 that didn't work (shift/reduce conflicts meant that these rules never
937 got executed). The problem is that
938 int (foo::bar::baz::bizzle)
939 is a function type but
940 int (foo::bar::baz::bizzle::*)
941 is a pointer to member type. Stroustrup loses again! */
946 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
950 { $$ = parse_type->builtin_int; }
952 { $$ = parse_type->builtin_long; }
954 { $$ = parse_type->builtin_short; }
956 { $$ = parse_type->builtin_long; }
957 | LONG SIGNED_KEYWORD INT_KEYWORD
958 { $$ = parse_type->builtin_long; }
959 | LONG SIGNED_KEYWORD
960 { $$ = parse_type->builtin_long; }
961 | SIGNED_KEYWORD LONG INT_KEYWORD
962 { $$ = parse_type->builtin_long; }
963 | UNSIGNED LONG INT_KEYWORD
964 { $$ = parse_type->builtin_unsigned_long; }
965 | LONG UNSIGNED INT_KEYWORD
966 { $$ = parse_type->builtin_unsigned_long; }
968 { $$ = parse_type->builtin_unsigned_long; }
970 { $$ = parse_type->builtin_long_long; }
971 | LONG LONG INT_KEYWORD
972 { $$ = parse_type->builtin_long_long; }
973 | LONG LONG SIGNED_KEYWORD INT_KEYWORD
974 { $$ = parse_type->builtin_long_long; }
975 | LONG LONG SIGNED_KEYWORD
976 { $$ = parse_type->builtin_long_long; }
977 | SIGNED_KEYWORD LONG LONG
978 { $$ = parse_type->builtin_long_long; }
979 | SIGNED_KEYWORD LONG LONG INT_KEYWORD
980 { $$ = parse_type->builtin_long_long; }
982 { $$ = parse_type->builtin_unsigned_long_long; }
983 | UNSIGNED LONG LONG INT_KEYWORD
984 { $$ = parse_type->builtin_unsigned_long_long; }
986 { $$ = parse_type->builtin_unsigned_long_long; }
987 | LONG LONG UNSIGNED INT_KEYWORD
988 { $$ = parse_type->builtin_unsigned_long_long; }
990 { $$ = parse_type->builtin_short; }
991 | SHORT SIGNED_KEYWORD INT_KEYWORD
992 { $$ = parse_type->builtin_short; }
993 | SHORT SIGNED_KEYWORD
994 { $$ = parse_type->builtin_short; }
995 | UNSIGNED SHORT INT_KEYWORD
996 { $$ = parse_type->builtin_unsigned_short; }
998 { $$ = parse_type->builtin_unsigned_short; }
999 | SHORT UNSIGNED INT_KEYWORD
1000 { $$ = parse_type->builtin_unsigned_short; }
1002 { $$ = parse_type->builtin_double; }
1003 | LONG DOUBLE_KEYWORD
1004 { $$ = parse_type->builtin_long_double; }
1006 { $$ = lookup_struct (copy_name ($2),
1007 expression_context_block); }
1009 { $$ = lookup_struct (copy_name ($2),
1010 expression_context_block); }
1012 { $$ = lookup_union (copy_name ($2),
1013 expression_context_block); }
1015 { $$ = lookup_enum (copy_name ($2),
1016 expression_context_block); }
1018 { $$ = lookup_unsigned_typename (parse_language,
1020 TYPE_NAME($2.type)); }
1022 { $$ = parse_type->builtin_unsigned_int; }
1023 | SIGNED_KEYWORD typename
1024 { $$ = lookup_signed_typename (parse_language,
1026 TYPE_NAME($2.type)); }
1028 { $$ = parse_type->builtin_int; }
1029 /* It appears that this rule for templates is never
1030 reduced; template recognition happens by lookahead
1031 in the token processing code in yylex. */
1032 | TEMPLATE name '<' type '>'
1033 { $$ = lookup_template_type(copy_name($2), $4,
1034 expression_context_block);
1036 | const_or_volatile_or_space_identifier_noopt typebase
1037 { $$ = follow_types ($2); }
1038 | typebase const_or_volatile_or_space_identifier_noopt
1039 { $$ = follow_types ($1); }
1043 /* FIXME: carlton/2003-09-25: This next bit leads to lots of
1044 reduce-reduce conflicts, because the parser doesn't know whether or
1045 not to use qualified_name or qualified_type: the rules are
1046 identical. If the parser is parsing 'A::B::x', then, when it sees
1047 the second '::', it knows that the expression to the left of it has
1048 to be a type, so it uses qualified_type. But if it is parsing just
1049 'A::B', then it doesn't have any way of knowing which rule to use,
1050 so there's a reduce-reduce conflict; it picks qualified_name, since
1051 that occurs earlier in this file than qualified_type.
1053 There's no good way to fix this with the grammar as it stands; as
1054 far as I can tell, some of the problems arise from ambiguities that
1055 GDB introduces ('start' can be either an expression or a type), but
1056 some of it is inherent to the nature of C++ (you want to treat the
1057 input "(FOO)" fairly differently depending on whether FOO is an
1058 expression or a type, and if FOO is a complex expression, this can
1059 be hard to determine at the right time). Fortunately, it works
1060 pretty well in most cases. For example, if you do 'ptype A::B',
1061 where A::B is a nested type, then the parser will mistakenly
1062 misidentify it as an expression; but evaluate_subexp will get
1063 called with 'noside' set to EVAL_AVOID_SIDE_EFFECTS, and everything
1064 will work out anyways. But there are situations where the parser
1065 will get confused: the most common one that I've run into is when
1068 print *((A::B *) x)"
1070 where the parser doesn't realize that A::B has to be a type until
1071 it hits the first right paren, at which point it's too late. (The
1072 workaround is to type "print *(('A::B' *) x)" instead.) (And
1073 another solution is to fix our symbol-handling code so that the
1074 user never wants to type something like that in the first place,
1075 because we get all the types right without the user's help!)
1077 Perhaps we could fix this by making the lexer smarter. Some of
1078 this functionality used to be in the lexer, but in a way that
1079 worked even less well than the current solution: that attempt
1080 involved having the parser sometimes handle '::' and having the
1081 lexer sometimes handle it, and without a clear division of
1082 responsibility, it quickly degenerated into a big mess. Probably
1083 the eventual correct solution will give more of a role to the lexer
1084 (ideally via code that is shared between the lexer and
1085 decode_line_1), but I'm not holding my breath waiting for somebody
1086 to get around to cleaning this up... */
1088 qualified_type: typebase COLONCOLON name
1090 struct type *type = $1;
1091 struct type *new_type;
1092 char *ncopy = alloca ($3.length + 1);
1094 memcpy (ncopy, $3.ptr, $3.length);
1095 ncopy[$3.length] = '\0';
1097 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
1098 && TYPE_CODE (type) != TYPE_CODE_UNION
1099 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
1100 error ("`%s' is not defined as an aggregate type.",
1103 new_type = cp_lookup_nested_type (type, ncopy,
1104 expression_context_block);
1105 if (new_type == NULL)
1106 error ("No type \"%s\" within class or namespace \"%s\".",
1107 ncopy, TYPE_NAME (type));
1116 $$.stoken.ptr = "int";
1117 $$.stoken.length = 3;
1118 $$.type = parse_type->builtin_int;
1122 $$.stoken.ptr = "long";
1123 $$.stoken.length = 4;
1124 $$.type = parse_type->builtin_long;
1128 $$.stoken.ptr = "short";
1129 $$.stoken.length = 5;
1130 $$.type = parse_type->builtin_short;
1136 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
1137 $<ivec>$[0] = 1; /* Number of types in vector */
1140 | nonempty_typelist ',' type
1141 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
1142 $$ = (struct type **) realloc ((char *) $1, len);
1143 $$[$<ivec>$[0]] = $3;
1148 | ptype const_or_volatile_or_space_identifier abs_decl const_or_volatile_or_space_identifier
1149 { $$ = follow_types ($1); }
1152 const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
1153 | VOLATILE_KEYWORD CONST_KEYWORD
1156 const_or_volatile_noopt: const_and_volatile
1157 { push_type (tp_const);
1158 push_type (tp_volatile);
1161 { push_type (tp_const); }
1163 { push_type (tp_volatile); }
1166 operator: OPERATOR NEW
1167 { $$ = operator_stoken (" new"); }
1169 { $$ = operator_stoken (" delete"); }
1170 | OPERATOR NEW '[' ']'
1171 { $$ = operator_stoken (" new[]"); }
1172 | OPERATOR DELETE '[' ']'
1173 { $$ = operator_stoken (" delete[]"); }
1175 { $$ = operator_stoken ("+"); }
1177 { $$ = operator_stoken ("-"); }
1179 { $$ = operator_stoken ("*"); }
1181 { $$ = operator_stoken ("/"); }
1183 { $$ = operator_stoken ("%"); }
1185 { $$ = operator_stoken ("^"); }
1187 { $$ = operator_stoken ("&"); }
1189 { $$ = operator_stoken ("|"); }
1191 { $$ = operator_stoken ("~"); }
1193 { $$ = operator_stoken ("!"); }
1195 { $$ = operator_stoken ("="); }
1197 { $$ = operator_stoken ("<"); }
1199 { $$ = operator_stoken (">"); }
1200 | OPERATOR ASSIGN_MODIFY
1201 { const char *op = "unknown";
1225 case BINOP_BITWISE_IOR:
1228 case BINOP_BITWISE_AND:
1231 case BINOP_BITWISE_XOR:
1238 $$ = operator_stoken (op);
1241 { $$ = operator_stoken ("<<"); }
1243 { $$ = operator_stoken (">>"); }
1245 { $$ = operator_stoken ("=="); }
1247 { $$ = operator_stoken ("!="); }
1249 { $$ = operator_stoken ("<="); }
1251 { $$ = operator_stoken (">="); }
1253 { $$ = operator_stoken ("&&"); }
1255 { $$ = operator_stoken ("||"); }
1256 | OPERATOR INCREMENT
1257 { $$ = operator_stoken ("++"); }
1258 | OPERATOR DECREMENT
1259 { $$ = operator_stoken ("--"); }
1261 { $$ = operator_stoken (","); }
1262 | OPERATOR ARROW_STAR
1263 { $$ = operator_stoken ("->*"); }
1265 { $$ = operator_stoken ("->"); }
1267 { $$ = operator_stoken ("()"); }
1269 { $$ = operator_stoken ("[]"); }
1273 struct ui_file *buf = mem_fileopen ();
1275 c_print_type ($2, NULL, buf, -1, 0);
1276 name = ui_file_xstrdup (buf, &length);
1277 ui_file_delete (buf);
1278 $$ = operator_stoken (name);
1285 name : NAME { $$ = $1.stoken; }
1286 | BLOCKNAME { $$ = $1.stoken; }
1287 | TYPENAME { $$ = $1.stoken; }
1288 | NAME_OR_INT { $$ = $1.stoken; }
1289 | operator { $$ = $1; }
1292 name_not_typename : NAME
1294 /* These would be useful if name_not_typename was useful, but it is just
1295 a fake for "variable", so these cause reduce/reduce conflicts because
1296 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
1297 =exp) or just an exp. If name_not_typename was ever used in an lvalue
1298 context where only a name could occur, this might be useful.
1305 /* Returns a stoken of the operator name given by OP (which does not
1306 include the string "operator"). */
1307 static struct stoken
1308 operator_stoken (const char *op)
1310 static const char *operator_string = "operator";
1311 struct stoken st = { NULL, 0 };
1312 st.length = strlen (operator_string) + strlen (op);
1313 st.ptr = malloc (st.length + 1);
1314 strcpy (st.ptr, operator_string);
1315 strcat (st.ptr, op);
1317 /* The toplevel (c_parse) will free the memory allocated here. */
1318 make_cleanup (free, st.ptr);
1322 /* Take care of parsing a number (anything that starts with a digit).
1323 Set yylval and return the token type; update lexptr.
1324 LEN is the number of characters in it. */
1326 /*** Needs some error checking for the float case ***/
1329 parse_number (char *p, int len, int parsed_float, YYSTYPE *putithere)
1331 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
1332 here, and we do kind of silly things like cast to unsigned. */
1339 int base = input_radix;
1342 /* Number of "L" suffixes encountered. */
1345 /* We have found a "L" or "U" suffix. */
1346 int found_suffix = 0;
1349 struct type *signed_type;
1350 struct type *unsigned_type;
1354 /* It's a float since it contains a point or an exponent. */
1356 int num; /* number of tokens scanned by scanf */
1359 /* If it ends at "df", "dd" or "dl", take it as type of decimal floating
1360 point. Return DECFLOAT. */
1362 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
1365 putithere->typed_val_decfloat.type
1366 = parse_type->builtin_decfloat;
1367 decimal_from_string (putithere->typed_val_decfloat.val, 4,
1368 gdbarch_byte_order (parse_gdbarch), p);
1373 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
1376 putithere->typed_val_decfloat.type
1377 = parse_type->builtin_decdouble;
1378 decimal_from_string (putithere->typed_val_decfloat.val, 8,
1379 gdbarch_byte_order (parse_gdbarch), p);
1384 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
1387 putithere->typed_val_decfloat.type
1388 = parse_type->builtin_declong;
1389 decimal_from_string (putithere->typed_val_decfloat.val, 16,
1390 gdbarch_byte_order (parse_gdbarch), p);
1396 saved_char = p[len];
1397 p[len] = 0; /* null-terminate the token */
1398 num = sscanf (p, "%" DOUBLEST_SCAN_FORMAT "%s",
1399 &putithere->typed_val_float.dval, s);
1400 p[len] = saved_char; /* restore the input stream */
1403 putithere->typed_val_float.type =
1404 parse_type->builtin_double;
1408 /* See if it has any float suffix: 'f' for float, 'l' for long
1410 if (!strcasecmp (s, "f"))
1411 putithere->typed_val_float.type =
1412 parse_type->builtin_float;
1413 else if (!strcasecmp (s, "l"))
1414 putithere->typed_val_float.type =
1415 parse_type->builtin_long_double;
1427 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1471 if (c >= 'A' && c <= 'Z')
1473 if (c != 'l' && c != 'u')
1475 if (c >= '0' && c <= '9')
1483 if (base > 10 && c >= 'a' && c <= 'f')
1487 n += i = c - 'a' + 10;
1500 return ERROR; /* Char not a digit */
1503 return ERROR; /* Invalid digit in this base */
1505 /* Portably test for overflow (only works for nonzero values, so make
1506 a second check for zero). FIXME: Can't we just make n and prevn
1507 unsigned and avoid this? */
1508 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1509 unsigned_p = 1; /* Try something unsigned */
1511 /* Portably test for unsigned overflow.
1512 FIXME: This check is wrong; for example it doesn't find overflow
1513 on 0x123456789 when LONGEST is 32 bits. */
1514 if (c != 'l' && c != 'u' && n != 0)
1516 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
1517 error ("Numeric constant too large.");
1522 /* An integer constant is an int, a long, or a long long. An L
1523 suffix forces it to be long; an LL suffix forces it to be long
1524 long. If not forced to a larger size, it gets the first type of
1525 the above that it fits in. To figure out whether it fits, we
1526 shift it right and see whether anything remains. Note that we
1527 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1528 operation, because many compilers will warn about such a shift
1529 (which always produces a zero result). Sometimes gdbarch_int_bit
1530 or gdbarch_long_bit will be that big, sometimes not. To deal with
1531 the case where it is we just always shift the value more than
1532 once, with fewer bits each time. */
1534 un = (ULONGEST)n >> 2;
1536 && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
1538 high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
1540 /* A large decimal (not hex or octal) constant (between INT_MAX
1541 and UINT_MAX) is a long or unsigned long, according to ANSI,
1542 never an unsigned int, but this code treats it as unsigned
1543 int. This probably should be fixed. GCC gives a warning on
1546 unsigned_type = parse_type->builtin_unsigned_int;
1547 signed_type = parse_type->builtin_int;
1549 else if (long_p <= 1
1550 && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
1552 high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
1553 unsigned_type = parse_type->builtin_unsigned_long;
1554 signed_type = parse_type->builtin_long;
1559 if (sizeof (ULONGEST) * HOST_CHAR_BIT
1560 < gdbarch_long_long_bit (parse_gdbarch))
1561 /* A long long does not fit in a LONGEST. */
1562 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1564 shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
1565 high_bit = (ULONGEST) 1 << shift;
1566 unsigned_type = parse_type->builtin_unsigned_long_long;
1567 signed_type = parse_type->builtin_long_long;
1570 putithere->typed_val_int.val = n;
1572 /* If the high bit of the worked out type is set then this number
1573 has to be unsigned. */
1575 if (unsigned_p || (n & high_bit))
1577 putithere->typed_val_int.type = unsigned_type;
1581 putithere->typed_val_int.type = signed_type;
1587 /* Temporary obstack used for holding strings. */
1588 static struct obstack tempbuf;
1589 static int tempbuf_init;
1591 /* Parse a C escape sequence. The initial backslash of the sequence
1592 is at (*PTR)[-1]. *PTR will be updated to point to just after the
1593 last character of the sequence. If OUTPUT is not NULL, the
1594 translated form of the escape sequence will be written there. If
1595 OUTPUT is NULL, no output is written and the call will only affect
1596 *PTR. If an escape sequence is expressed in target bytes, then the
1597 entire sequence will simply be copied to OUTPUT. Return 1 if any
1598 character was emitted, 0 otherwise. */
1601 c_parse_escape (char **ptr, struct obstack *output)
1603 char *tokptr = *ptr;
1606 /* Some escape sequences undergo character set conversion. Those we
1610 /* Hex escapes do not undergo character set conversion, so keep
1611 the escape sequence for later. */
1614 obstack_grow_str (output, "\\x");
1616 if (!isxdigit (*tokptr))
1617 error (_("\\x escape without a following hex digit"));
1618 while (isxdigit (*tokptr))
1621 obstack_1grow (output, *tokptr);
1626 /* Octal escapes do not undergo character set conversion, so
1627 keep the escape sequence for later. */
1639 obstack_grow_str (output, "\\");
1641 i < 3 && isdigit (*tokptr) && *tokptr != '8' && *tokptr != '9';
1645 obstack_1grow (output, *tokptr);
1651 /* We handle UCNs later. We could handle them here, but that
1652 would mean a spurious error in the case where the UCN could
1653 be converted to the target charset but not the host
1659 int i, len = c == 'U' ? 8 : 4;
1662 obstack_1grow (output, '\\');
1663 obstack_1grow (output, *tokptr);
1666 if (!isxdigit (*tokptr))
1667 error (_("\\%c escape without a following hex digit"), c);
1668 for (i = 0; i < len && isxdigit (*tokptr); ++i)
1671 obstack_1grow (output, *tokptr);
1677 /* We must pass backslash through so that it does not
1678 cause quoting during the second expansion. */
1681 obstack_grow_str (output, "\\\\");
1685 /* Escapes which undergo conversion. */
1688 obstack_1grow (output, '\a');
1693 obstack_1grow (output, '\b');
1698 obstack_1grow (output, '\f');
1703 obstack_1grow (output, '\n');
1708 obstack_1grow (output, '\r');
1713 obstack_1grow (output, '\t');
1718 obstack_1grow (output, '\v');
1722 /* GCC extension. */
1725 obstack_1grow (output, HOST_ESCAPE_CHAR);
1729 /* Backslash-newline expands to nothing at all. */
1735 /* A few escapes just expand to the character itself. */
1739 /* GCC extensions. */
1744 /* Unrecognized escapes turn into the character itself. */
1747 obstack_1grow (output, *tokptr);
1755 /* Parse a string or character literal from TOKPTR. The string or
1756 character may be wide or unicode. *OUTPTR is set to just after the
1757 end of the literal in the input string. The resulting token is
1758 stored in VALUE. This returns a token value, either STRING or
1759 CHAR, depending on what was parsed. *HOST_CHARS is set to the
1760 number of host characters in the literal. */
1762 parse_string_or_char (char *tokptr, char **outptr, struct typed_stoken *value,
1766 enum c_string_type type;
1768 /* Build the gdb internal form of the input string in tempbuf. Note
1769 that the buffer is null byte terminated *only* for the
1770 convenience of debugging gdb itself and printing the buffer
1771 contents when the buffer contains no embedded nulls. Gdb does
1772 not depend upon the buffer being null byte terminated, it uses
1773 the length string instead. This allows gdb to handle C strings
1774 (as well as strings in other languages) with embedded null
1780 obstack_free (&tempbuf, NULL);
1781 obstack_init (&tempbuf);
1783 /* Record the string type. */
1786 type = C_WIDE_STRING;
1789 else if (*tokptr == 'u')
1794 else if (*tokptr == 'U')
1802 /* Skip the quote. */
1816 *host_chars += c_parse_escape (&tokptr, &tempbuf);
1818 else if (c == quote)
1822 obstack_1grow (&tempbuf, c);
1824 /* FIXME: this does the wrong thing with multi-byte host
1825 characters. We could use mbrlen here, but that would
1826 make "set host-charset" a bit less useful. */
1831 if (*tokptr != quote)
1834 error ("Unterminated string in expression.");
1836 error ("Unmatched single quote.");
1841 value->ptr = obstack_base (&tempbuf);
1842 value->length = obstack_object_size (&tempbuf);
1846 return quote == '"' ? STRING : CHAR;
1853 enum exp_opcode opcode;
1857 static const struct token tokentab3[] =
1859 {">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
1860 {"<<=", ASSIGN_MODIFY, BINOP_LSH, 0},
1861 {"->*", ARROW_STAR, BINOP_END, 1}
1864 static const struct token tokentab2[] =
1866 {"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
1867 {"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
1868 {"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
1869 {"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
1870 {"%=", ASSIGN_MODIFY, BINOP_REM, 0},
1871 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
1872 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
1873 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
1874 {"++", INCREMENT, BINOP_END, 0},
1875 {"--", DECREMENT, BINOP_END, 0},
1876 {"->", ARROW, BINOP_END, 0},
1877 {"&&", ANDAND, BINOP_END, 0},
1878 {"||", OROR, BINOP_END, 0},
1879 /* "::" is *not* only C++: gdb overrides its meaning in several
1880 different ways, e.g., 'filename'::func, function::variable. */
1881 {"::", COLONCOLON, BINOP_END, 0},
1882 {"<<", LSH, BINOP_END, 0},
1883 {">>", RSH, BINOP_END, 0},
1884 {"==", EQUAL, BINOP_END, 0},
1885 {"!=", NOTEQUAL, BINOP_END, 0},
1886 {"<=", LEQ, BINOP_END, 0},
1887 {">=", GEQ, BINOP_END, 0},
1888 {".*", DOT_STAR, BINOP_END, 1}
1891 /* Identifier-like tokens. */
1892 static const struct token ident_tokens[] =
1894 {"unsigned", UNSIGNED, OP_NULL, 0},
1895 {"template", TEMPLATE, OP_NULL, 1},
1896 {"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
1897 {"struct", STRUCT, OP_NULL, 0},
1898 {"signed", SIGNED_KEYWORD, OP_NULL, 0},
1899 {"sizeof", SIZEOF, OP_NULL, 0},
1900 {"double", DOUBLE_KEYWORD, OP_NULL, 0},
1901 {"false", FALSEKEYWORD, OP_NULL, 1},
1902 {"class", CLASS, OP_NULL, 1},
1903 {"union", UNION, OP_NULL, 0},
1904 {"short", SHORT, OP_NULL, 0},
1905 {"const", CONST_KEYWORD, OP_NULL, 0},
1906 {"enum", ENUM, OP_NULL, 0},
1907 {"long", LONG, OP_NULL, 0},
1908 {"true", TRUEKEYWORD, OP_NULL, 1},
1909 {"int", INT_KEYWORD, OP_NULL, 0},
1910 {"new", NEW, OP_NULL, 1},
1911 {"delete", DELETE, OP_NULL, 1},
1912 {"operator", OPERATOR, OP_NULL, 1},
1914 {"and", ANDAND, BINOP_END, 1},
1915 {"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, 1},
1916 {"bitand", '&', OP_NULL, 1},
1917 {"bitor", '|', OP_NULL, 1},
1918 {"compl", '~', OP_NULL, 1},
1919 {"not", '!', OP_NULL, 1},
1920 {"not_eq", NOTEQUAL, BINOP_END, 1},
1921 {"or", OROR, BINOP_END, 1},
1922 {"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 1},
1923 {"xor", '^', OP_NULL, 1},
1924 {"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 1},
1926 {"const_cast", CONST_CAST, OP_NULL, 1 },
1927 {"dynamic_cast", DYNAMIC_CAST, OP_NULL, 1 },
1928 {"static_cast", STATIC_CAST, OP_NULL, 1 },
1929 {"reinterpret_cast", REINTERPRET_CAST, OP_NULL, 1 }
1932 /* When we find that lexptr (the global var defined in parse.c) is
1933 pointing at a macro invocation, we expand the invocation, and call
1934 scan_macro_expansion to save the old lexptr here and point lexptr
1935 into the expanded text. When we reach the end of that, we call
1936 end_macro_expansion to pop back to the value we saved here. The
1937 macro expansion code promises to return only fully-expanded text,
1938 so we don't need to "push" more than one level.
1940 This is disgusting, of course. It would be cleaner to do all macro
1941 expansion beforehand, and then hand that to lexptr. But we don't
1942 really know where the expression ends. Remember, in a command like
1944 (gdb) break *ADDRESS if CONDITION
1946 we evaluate ADDRESS in the scope of the current frame, but we
1947 evaluate CONDITION in the scope of the breakpoint's location. So
1948 it's simply wrong to try to macro-expand the whole thing at once. */
1949 static char *macro_original_text;
1951 /* We save all intermediate macro expansions on this obstack for the
1952 duration of a single parse. The expansion text may sometimes have
1953 to live past the end of the expansion, due to yacc lookahead.
1954 Rather than try to be clever about saving the data for a single
1955 token, we simply keep it all and delete it after parsing has
1957 static struct obstack expansion_obstack;
1960 scan_macro_expansion (char *expansion)
1964 /* We'd better not be trying to push the stack twice. */
1965 gdb_assert (! macro_original_text);
1967 /* Copy to the obstack, and then free the intermediate
1969 copy = obstack_copy0 (&expansion_obstack, expansion, strlen (expansion));
1972 /* Save the old lexptr value, so we can return to it when we're done
1973 parsing the expanded text. */
1974 macro_original_text = lexptr;
1980 scanning_macro_expansion (void)
1982 return macro_original_text != 0;
1987 finished_macro_expansion (void)
1989 /* There'd better be something to pop back to. */
1990 gdb_assert (macro_original_text);
1992 /* Pop back to the original text. */
1993 lexptr = macro_original_text;
1994 macro_original_text = 0;
1999 scan_macro_cleanup (void *dummy)
2001 if (macro_original_text)
2002 finished_macro_expansion ();
2004 obstack_free (&expansion_obstack, NULL);
2007 /* Return true iff the token represents a C++ cast operator. */
2010 is_cast_operator (const char *token, int len)
2012 return (! strncmp (token, "dynamic_cast", len)
2013 || ! strncmp (token, "static_cast", len)
2014 || ! strncmp (token, "reinterpret_cast", len)
2015 || ! strncmp (token, "const_cast", len));
2018 /* The scope used for macro expansion. */
2019 static struct macro_scope *expression_macro_scope;
2021 /* This is set if a NAME token appeared at the very end of the input
2022 string, with no whitespace separating the name from the EOF. This
2023 is used only when parsing to do field name completion. */
2024 static int saw_name_at_eof;
2026 /* This is set if the previously-returned token was a structure
2027 operator -- either '.' or ARROW. This is used only when parsing to
2028 do field name completion. */
2029 static int last_was_structop;
2031 /* Read one token, getting characters through lexptr. */
2040 int saw_structop = last_was_structop;
2043 last_was_structop = 0;
2047 /* Check if this is a macro invocation that we need to expand. */
2048 if (! scanning_macro_expansion ())
2050 char *expanded = macro_expand_next (&lexptr,
2051 standard_macro_lookup,
2052 expression_macro_scope);
2055 scan_macro_expansion (expanded);
2058 prev_lexptr = lexptr;
2061 /* See if it is a special token of length 3. */
2062 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
2063 if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
2065 if (tokentab3[i].cxx_only
2066 && parse_language->la_language != language_cplus)
2070 yylval.opcode = tokentab3[i].opcode;
2071 return tokentab3[i].token;
2074 /* See if it is a special token of length 2. */
2075 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
2076 if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
2078 if (tokentab2[i].cxx_only
2079 && parse_language->la_language != language_cplus)
2083 yylval.opcode = tokentab2[i].opcode;
2084 if (in_parse_field && tokentab2[i].token == ARROW)
2085 last_was_structop = 1;
2086 return tokentab2[i].token;
2089 switch (c = *tokstart)
2092 /* If we were just scanning the result of a macro expansion,
2093 then we need to resume scanning the original text.
2094 If we're parsing for field name completion, and the previous
2095 token allows such completion, return a COMPLETE token.
2096 Otherwise, we were already scanning the original text, and
2097 we're really done. */
2098 if (scanning_macro_expansion ())
2100 finished_macro_expansion ();
2103 else if (saw_name_at_eof)
2105 saw_name_at_eof = 0;
2108 else if (saw_structop)
2127 if (paren_depth == 0)
2134 if (comma_terminates
2136 && ! scanning_macro_expansion ())
2142 /* Might be a floating point number. */
2143 if (lexptr[1] < '0' || lexptr[1] > '9')
2146 last_was_structop = 1;
2147 goto symbol; /* Nope, must be a symbol. */
2149 /* FALL THRU into number case. */
2162 /* It's a number. */
2163 int got_dot = 0, got_e = 0, toktype;
2165 int hex = input_radix > 10;
2167 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
2172 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
2180 /* This test includes !hex because 'e' is a valid hex digit
2181 and thus does not indicate a floating point number when
2182 the radix is hex. */
2183 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
2184 got_dot = got_e = 1;
2185 /* This test does not include !hex, because a '.' always indicates
2186 a decimal floating point number regardless of the radix. */
2187 else if (!got_dot && *p == '.')
2189 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
2190 && (*p == '-' || *p == '+'))
2191 /* This is the sign of the exponent, not the end of the
2194 /* We will take any letters or digits. parse_number will
2195 complain if past the radix, or if L or U are not final. */
2196 else if ((*p < '0' || *p > '9')
2197 && ((*p < 'a' || *p > 'z')
2198 && (*p < 'A' || *p > 'Z')))
2201 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
2202 if (toktype == ERROR)
2204 char *err_copy = (char *) alloca (p - tokstart + 1);
2206 memcpy (err_copy, tokstart, p - tokstart);
2207 err_copy[p - tokstart] = 0;
2208 error ("Invalid number \"%s\".", err_copy);
2239 if (tokstart[1] != '"' && tokstart[1] != '\'')
2246 int result = parse_string_or_char (tokstart, &lexptr, &yylval.tsval,
2251 error ("Empty character constant.");
2252 else if (host_len > 2 && c == '\'')
2255 namelen = lexptr - tokstart - 1;
2258 else if (host_len > 1)
2259 error ("Invalid character constant.");
2265 if (!(c == '_' || c == '$'
2266 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
2267 /* We must have come across a bad character (e.g. ';'). */
2268 error ("Invalid character '%c' in expression.", c);
2270 /* It's a name. See how long it is. */
2272 for (c = tokstart[namelen];
2273 (c == '_' || c == '$' || (c >= '0' && c <= '9')
2274 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
2276 /* Template parameter lists are part of the name.
2277 FIXME: This mishandles `print $a<4&&$a>3'. */
2281 if (! is_cast_operator (tokstart, namelen))
2283 /* Scan ahead to get rest of the template specification. Note
2284 that we look ahead only when the '<' adjoins non-whitespace
2285 characters; for comparison expressions, e.g. "a < b > c",
2286 there must be spaces before the '<', etc. */
2288 char * p = find_template_name_end (tokstart + namelen);
2290 namelen = p - tokstart;
2294 c = tokstart[++namelen];
2297 /* The token "if" terminates the expression and is NOT removed from
2298 the input stream. It doesn't count if it appears in the
2299 expansion of a macro. */
2301 && tokstart[0] == 'i'
2302 && tokstart[1] == 'f'
2303 && ! scanning_macro_expansion ())
2308 /* For the same reason (breakpoint conditions), "thread N"
2309 terminates the expression. "thread" could be an identifier, but
2310 an identifier is never followed by a number without intervening
2311 punctuation. "task" is similar. Handle abbreviations of these,
2312 similarly to breakpoint.c:find_condition_and_thread. */
2314 && (strncmp (tokstart, "thread", namelen) == 0
2315 || strncmp (tokstart, "task", namelen) == 0)
2316 && (tokstart[namelen] == ' ' || tokstart[namelen] == '\t')
2317 && ! scanning_macro_expansion ())
2319 char *p = tokstart + namelen + 1;
2320 while (*p == ' ' || *p == '\t')
2322 if (*p >= '0' && *p <= '9')
2330 yylval.sval.ptr = tokstart;
2331 yylval.sval.length = namelen;
2333 /* Catch specific keywords. */
2334 copy = copy_name (yylval.sval);
2335 for (i = 0; i < sizeof ident_tokens / sizeof ident_tokens[0]; i++)
2336 if (strcmp (copy, ident_tokens[i].operator) == 0)
2338 if (ident_tokens[i].cxx_only
2339 && parse_language->la_language != language_cplus)
2342 /* It is ok to always set this, even though we don't always
2343 strictly need to. */
2344 yylval.opcode = ident_tokens[i].opcode;
2345 return ident_tokens[i].token;
2348 if (*tokstart == '$')
2350 write_dollar_variable (yylval.sval);
2354 /* Use token-type BLOCKNAME for symbols that happen to be defined as
2355 functions or symtabs. If this is not so, then ...
2356 Use token-type TYPENAME for symbols that happen to be defined
2357 currently as names of types; NAME for other symbols.
2358 The caller is not constrained to care about the distinction. */
2361 int is_a_field_of_this = 0;
2364 sym = lookup_symbol (copy, expression_context_block,
2366 parse_language->la_language == language_cplus
2367 ? &is_a_field_of_this : (int *) NULL);
2368 /* Call lookup_symtab, not lookup_partial_symtab, in case there are
2369 no psymtabs (coff, xcoff, or some future change to blow away the
2370 psymtabs once once symbols are read). */
2371 if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
2373 yylval.ssym.sym = sym;
2374 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2378 { /* See if it's a file name. */
2379 struct symtab *symtab;
2381 symtab = lookup_symtab (copy);
2385 yylval.bval = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), STATIC_BLOCK);
2390 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
2392 /* NOTE: carlton/2003-09-25: There used to be code here to
2393 handle nested types. It didn't work very well. See the
2394 comment before qualified_type for more info. */
2395 yylval.tsym.type = SYMBOL_TYPE (sym);
2399 = language_lookup_primitive_type_by_name (parse_language,
2400 parse_gdbarch, copy);
2401 if (yylval.tsym.type != NULL)
2404 /* Input names that aren't symbols but ARE valid hex numbers,
2405 when the input radix permits them, can be names or numbers
2406 depending on the parse. Note we support radixes > 16 here. */
2408 && ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10)
2409 || (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
2411 YYSTYPE newlval; /* Its value is ignored. */
2412 hextype = parse_number (tokstart, namelen, 0, &newlval);
2415 yylval.ssym.sym = sym;
2416 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2421 /* Any other kind of symbol */
2422 yylval.ssym.sym = sym;
2423 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2424 if (in_parse_field && *lexptr == '\0')
2425 saw_name_at_eof = 1;
2434 struct cleanup *back_to = make_cleanup (free_current_contents,
2435 &expression_macro_scope);
2437 /* Set up the scope for macro expansion. */
2438 expression_macro_scope = NULL;
2440 if (expression_context_block)
2441 expression_macro_scope
2442 = sal_macro_scope (find_pc_line (expression_context_pc, 0));
2444 expression_macro_scope = default_macro_scope ();
2445 if (! expression_macro_scope)
2446 expression_macro_scope = user_macro_scope ();
2448 /* Initialize macro expansion code. */
2449 obstack_init (&expansion_obstack);
2450 gdb_assert (! macro_original_text);
2451 make_cleanup (scan_macro_cleanup, 0);
2453 /* Initialize some state used by the lexer. */
2454 last_was_structop = 0;
2455 saw_name_at_eof = 0;
2457 result = yyparse ();
2458 do_cleanups (back_to);
2467 lexptr = prev_lexptr;
2469 error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);