1 /* YACC parser for C expressions, for GDB.
2 Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
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 2 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, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 /* Parse a C expression from text in a string,
23 and return the result as a struct expression pointer.
24 That structure contains arithmetic operations in reverse polish,
25 with constants represented by operations that are followed by special data.
26 See expression.h for the details of the format.
27 What is important here is that it can be built up sequentially
28 during the process of parsing; the lower levels of the tree always
29 come first in the result.
31 Note that malloc's and realloc's in this file are transformed to
32 xmalloc and xrealloc respectively by the same sed command in the
33 makefile that remaps any other malloc/realloc inserted by the parser
34 generator. Doing this with #defines and trying to control the interaction
35 with include files (<malloc.h> and <stdlib.h> for example) just became
36 too messy, particularly when such includes can be inserted at random
37 times by the parser generator. */
42 #include "gdb_string.h"
44 #include "expression.h"
46 #include "parser-defs.h"
49 #include "bfd.h" /* Required by objfiles.h. */
50 #include "symfile.h" /* Required by objfiles.h. */
51 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
55 /* Flag indicating we're dealing with HP-compiled objects */
56 extern int hp_som_som_object_present;
58 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
59 as well as gratuitiously global symbol names, so we can have multiple
60 yacc generated parsers in gdb. Note that these are only the variables
61 produced by yacc. If other parser generators (bison, byacc, etc) produce
62 additional global names that conflict at link time, then those parser
63 generators need to be fixed instead of adding those names to this list. */
65 #define yymaxdepth c_maxdepth
66 #define yyparse c_parse
68 #define yyerror c_error
71 #define yydebug c_debug
80 #define yyerrflag c_errflag
81 #define yynerrs c_nerrs
86 #define yystate c_state
92 #define yyreds c_reds /* With YYDEBUG defined */
93 #define yytoks c_toks /* With YYDEBUG defined */
94 #define yyname c_name /* With YYDEBUG defined */
95 #define yyrule c_rule /* With YYDEBUG defined */
98 #define yydefred c_yydefred
99 #define yydgoto c_yydgoto
100 #define yysindex c_yysindex
101 #define yyrindex c_yyrindex
102 #define yygindex c_yygindex
103 #define yytable c_yytable
104 #define yycheck c_yycheck
107 #define YYDEBUG 1 /* Default to yydebug support */
110 #define YYFPRINTF parser_fprintf
114 static int yylex (void);
116 void yyerror (char *);
120 /* Although the yacc "value" of an expression is not used,
121 since the result is stored in the structure being created,
122 other node types do have values. */
139 struct symtoken ssym;
142 enum exp_opcode opcode;
143 struct internalvar *ivar;
150 /* YYSTYPE gets defined by %union */
151 static int parse_number (char *, int, int, YYSTYPE *);
154 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
156 %type <tval> type typebase
157 %type <tvec> nonempty_typelist
158 /* %type <bval> block */
160 /* Fancy type parsing. */
161 %type <voidval> func_mod direct_abs_decl abs_decl
163 %type <lval> array_mod
165 %token <typed_val_int> INT
166 %token <typed_val_float> FLOAT
168 /* Both NAME and TYPENAME tokens represent symbols in the input,
169 and both convey their data as strings.
170 But a TYPENAME is a string that happens to be defined as a typedef
171 or builtin type name (such as int or char)
172 and a NAME is any other symbol.
173 Contexts where this distinction is not important can use the
174 nonterminal "name", which matches either NAME or TYPENAME. */
177 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
178 %token <tsym> TYPENAME
180 %type <ssym> name_not_typename
181 %type <tsym> typename
183 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
184 but which would parse as a valid number in the current input radix.
185 E.g. "c" when input_radix==16. Depending on the parse, it will be
186 turned into a name or into a number. */
188 %token <ssym> NAME_OR_INT
190 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
194 /* Special type cases, put in to allow the parser to distinguish different
196 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
198 %token <voidval> VARIABLE
200 %token <opcode> ASSIGN_MODIFY
209 %right '=' ASSIGN_MODIFY
217 %left '<' '>' LEQ GEQ
222 %right UNARY INCREMENT DECREMENT
223 %right ARROW '.' '[' '('
224 %token <ssym> BLOCKNAME
225 %token <bval> FILENAME
237 { write_exp_elt_opcode(OP_TYPE);
238 write_exp_elt_type($1);
239 write_exp_elt_opcode(OP_TYPE);}
242 /* Expressions, including the comma operator. */
245 { write_exp_elt_opcode (BINOP_COMMA); }
248 /* Expressions, not including the comma operator. */
249 exp : '*' exp %prec UNARY
250 { write_exp_elt_opcode (UNOP_IND); }
253 exp : '&' exp %prec UNARY
254 { write_exp_elt_opcode (UNOP_ADDR); }
257 exp : '-' exp %prec UNARY
258 { write_exp_elt_opcode (UNOP_NEG); }
261 exp : '!' exp %prec UNARY
262 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
265 exp : '~' exp %prec UNARY
266 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
269 exp : INCREMENT exp %prec UNARY
270 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
273 exp : DECREMENT exp %prec UNARY
274 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
277 exp : exp INCREMENT %prec UNARY
278 { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
281 exp : exp DECREMENT %prec UNARY
282 { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
285 exp : SIZEOF exp %prec UNARY
286 { write_exp_elt_opcode (UNOP_SIZEOF); }
290 { write_exp_elt_opcode (STRUCTOP_PTR);
291 write_exp_string ($3);
292 write_exp_elt_opcode (STRUCTOP_PTR); }
295 exp : exp ARROW qualified_name
296 { /* exp->type::name becomes exp->*(&type::name) */
297 /* Note: this doesn't work if name is a
298 static member! FIXME */
299 write_exp_elt_opcode (UNOP_ADDR);
300 write_exp_elt_opcode (STRUCTOP_MPTR); }
303 exp : exp ARROW '*' exp
304 { write_exp_elt_opcode (STRUCTOP_MPTR); }
308 { write_exp_elt_opcode (STRUCTOP_STRUCT);
309 write_exp_string ($3);
310 write_exp_elt_opcode (STRUCTOP_STRUCT); }
313 exp : exp '.' qualified_name
314 { /* exp.type::name becomes exp.*(&type::name) */
315 /* Note: this doesn't work if name is a
316 static member! FIXME */
317 write_exp_elt_opcode (UNOP_ADDR);
318 write_exp_elt_opcode (STRUCTOP_MEMBER); }
321 exp : exp '.' '*' exp
322 { write_exp_elt_opcode (STRUCTOP_MEMBER); }
325 exp : exp '[' exp1 ']'
326 { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
330 /* This is to save the value of arglist_len
331 being accumulated by an outer function call. */
332 { start_arglist (); }
333 arglist ')' %prec ARROW
334 { write_exp_elt_opcode (OP_FUNCALL);
335 write_exp_elt_longcst ((LONGEST) end_arglist ());
336 write_exp_elt_opcode (OP_FUNCALL); }
340 { start_arglist (); }
350 arglist : arglist ',' exp %prec ABOVE_COMMA
355 { $$ = end_arglist () - 1; }
357 exp : lcurly arglist rcurly %prec ARROW
358 { write_exp_elt_opcode (OP_ARRAY);
359 write_exp_elt_longcst ((LONGEST) 0);
360 write_exp_elt_longcst ((LONGEST) $3);
361 write_exp_elt_opcode (OP_ARRAY); }
364 exp : lcurly type rcurly exp %prec UNARY
365 { write_exp_elt_opcode (UNOP_MEMVAL);
366 write_exp_elt_type ($2);
367 write_exp_elt_opcode (UNOP_MEMVAL); }
370 exp : '(' type ')' exp %prec UNARY
371 { write_exp_elt_opcode (UNOP_CAST);
372 write_exp_elt_type ($2);
373 write_exp_elt_opcode (UNOP_CAST); }
380 /* Binary operators in order of decreasing precedence. */
383 { write_exp_elt_opcode (BINOP_REPEAT); }
387 { write_exp_elt_opcode (BINOP_MUL); }
391 { write_exp_elt_opcode (BINOP_DIV); }
395 { write_exp_elt_opcode (BINOP_REM); }
399 { write_exp_elt_opcode (BINOP_ADD); }
403 { write_exp_elt_opcode (BINOP_SUB); }
407 { write_exp_elt_opcode (BINOP_LSH); }
411 { write_exp_elt_opcode (BINOP_RSH); }
415 { write_exp_elt_opcode (BINOP_EQUAL); }
418 exp : exp NOTEQUAL exp
419 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
423 { write_exp_elt_opcode (BINOP_LEQ); }
427 { write_exp_elt_opcode (BINOP_GEQ); }
431 { write_exp_elt_opcode (BINOP_LESS); }
435 { write_exp_elt_opcode (BINOP_GTR); }
439 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
443 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
447 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
451 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
455 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
458 exp : exp '?' exp ':' exp %prec '?'
459 { write_exp_elt_opcode (TERNOP_COND); }
463 { write_exp_elt_opcode (BINOP_ASSIGN); }
466 exp : exp ASSIGN_MODIFY exp
467 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
468 write_exp_elt_opcode ($2);
469 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
473 { write_exp_elt_opcode (OP_LONG);
474 write_exp_elt_type ($1.type);
475 write_exp_elt_longcst ((LONGEST)($1.val));
476 write_exp_elt_opcode (OP_LONG); }
481 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
482 write_exp_elt_opcode (OP_LONG);
483 write_exp_elt_type (val.typed_val_int.type);
484 write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
485 write_exp_elt_opcode (OP_LONG);
491 { write_exp_elt_opcode (OP_DOUBLE);
492 write_exp_elt_type ($1.type);
493 write_exp_elt_dblcst ($1.dval);
494 write_exp_elt_opcode (OP_DOUBLE); }
501 /* Already written by write_dollar_variable. */
504 exp : SIZEOF '(' type ')' %prec UNARY
505 { write_exp_elt_opcode (OP_LONG);
506 write_exp_elt_type (builtin_type_int);
508 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
509 write_exp_elt_opcode (OP_LONG); }
513 { /* C strings are converted into array constants with
514 an explicit null byte added at the end. Thus
515 the array upper bound is the string length.
516 There is no such thing in C as a completely empty
518 char *sp = $1.ptr; int count = $1.length;
521 write_exp_elt_opcode (OP_LONG);
522 write_exp_elt_type (builtin_type_char);
523 write_exp_elt_longcst ((LONGEST)(*sp++));
524 write_exp_elt_opcode (OP_LONG);
526 write_exp_elt_opcode (OP_LONG);
527 write_exp_elt_type (builtin_type_char);
528 write_exp_elt_longcst ((LONGEST)'\0');
529 write_exp_elt_opcode (OP_LONG);
530 write_exp_elt_opcode (OP_ARRAY);
531 write_exp_elt_longcst ((LONGEST) 0);
532 write_exp_elt_longcst ((LONGEST) ($1.length));
533 write_exp_elt_opcode (OP_ARRAY); }
538 { write_exp_elt_opcode (OP_LONG);
539 write_exp_elt_type (builtin_type_bool);
540 write_exp_elt_longcst ((LONGEST) 1);
541 write_exp_elt_opcode (OP_LONG); }
545 { write_exp_elt_opcode (OP_LONG);
546 write_exp_elt_type (builtin_type_bool);
547 write_exp_elt_longcst ((LONGEST) 0);
548 write_exp_elt_opcode (OP_LONG); }
556 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
558 error ("No file or function \"%s\".",
559 copy_name ($1.stoken));
567 block : block COLONCOLON name
569 = lookup_symbol (copy_name ($3), $1,
570 VAR_DOMAIN, (int *) NULL,
571 (struct symtab **) NULL);
572 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
573 error ("No function \"%s\" in specified context.",
575 $$ = SYMBOL_BLOCK_VALUE (tem); }
578 variable: block COLONCOLON name
579 { struct symbol *sym;
580 sym = lookup_symbol (copy_name ($3), $1,
581 VAR_DOMAIN, (int *) NULL,
582 (struct symtab **) NULL);
584 error ("No symbol \"%s\" in specified context.",
587 write_exp_elt_opcode (OP_VAR_VALUE);
588 /* block_found is set by lookup_symbol. */
589 write_exp_elt_block (block_found);
590 write_exp_elt_sym (sym);
591 write_exp_elt_opcode (OP_VAR_VALUE); }
594 qualified_name: typebase COLONCOLON name
596 struct type *type = $1;
597 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
598 && TYPE_CODE (type) != TYPE_CODE_UNION)
599 error ("`%s' is not defined as an aggregate type.",
602 write_exp_elt_opcode (OP_SCOPE);
603 write_exp_elt_type (type);
604 write_exp_string ($3);
605 write_exp_elt_opcode (OP_SCOPE);
607 | typebase COLONCOLON '~' name
609 struct type *type = $1;
610 struct stoken tmp_token;
611 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
612 && TYPE_CODE (type) != TYPE_CODE_UNION)
613 error ("`%s' is not defined as an aggregate type.",
616 tmp_token.ptr = (char*) alloca ($4.length + 2);
617 tmp_token.length = $4.length + 1;
618 tmp_token.ptr[0] = '~';
619 memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
620 tmp_token.ptr[tmp_token.length] = 0;
622 /* Check for valid destructor name. */
623 destructor_name_p (tmp_token.ptr, type);
624 write_exp_elt_opcode (OP_SCOPE);
625 write_exp_elt_type (type);
626 write_exp_string (tmp_token);
627 write_exp_elt_opcode (OP_SCOPE);
631 variable: qualified_name
634 char *name = copy_name ($2);
636 struct minimal_symbol *msymbol;
639 lookup_symbol (name, (const struct block *) NULL,
640 VAR_DOMAIN, (int *) NULL,
641 (struct symtab **) NULL);
644 write_exp_elt_opcode (OP_VAR_VALUE);
645 write_exp_elt_block (NULL);
646 write_exp_elt_sym (sym);
647 write_exp_elt_opcode (OP_VAR_VALUE);
651 msymbol = lookup_minimal_symbol (name, NULL, NULL);
654 write_exp_msymbol (msymbol,
655 lookup_function_type (builtin_type_int),
659 if (!have_full_symbols () && !have_partial_symbols ())
660 error ("No symbol table is loaded. Use the \"file\" command.");
662 error ("No symbol \"%s\" in current context.", name);
666 variable: name_not_typename
667 { struct symbol *sym = $1.sym;
671 if (symbol_read_needs_frame (sym))
673 if (innermost_block == 0 ||
674 contained_in (block_found,
676 innermost_block = block_found;
679 write_exp_elt_opcode (OP_VAR_VALUE);
680 /* We want to use the selected frame, not
681 another more inner frame which happens to
682 be in the same block. */
683 write_exp_elt_block (NULL);
684 write_exp_elt_sym (sym);
685 write_exp_elt_opcode (OP_VAR_VALUE);
687 else if ($1.is_a_field_of_this)
689 /* C++: it hangs off of `this'. Must
690 not inadvertently convert from a method call
692 if (innermost_block == 0 ||
693 contained_in (block_found, innermost_block))
694 innermost_block = block_found;
695 write_exp_elt_opcode (OP_THIS);
696 write_exp_elt_opcode (OP_THIS);
697 write_exp_elt_opcode (STRUCTOP_PTR);
698 write_exp_string ($1.stoken);
699 write_exp_elt_opcode (STRUCTOP_PTR);
703 struct minimal_symbol *msymbol;
704 register char *arg = copy_name ($1.stoken);
707 lookup_minimal_symbol (arg, NULL, NULL);
710 write_exp_msymbol (msymbol,
711 lookup_function_type (builtin_type_int),
714 else if (!have_full_symbols () && !have_partial_symbols ())
715 error ("No symbol table is loaded. Use the \"file\" command.");
717 error ("No symbol \"%s\" in current context.",
718 copy_name ($1.stoken));
723 space_identifier : '@' NAME
724 { push_type_address_space (copy_name ($2.stoken));
725 push_type (tp_space_identifier);
729 const_or_volatile: const_or_volatile_noopt
733 cv_with_space_id : const_or_volatile space_identifier const_or_volatile
736 const_or_volatile_or_space_identifier_noopt: cv_with_space_id
737 | const_or_volatile_noopt
740 const_or_volatile_or_space_identifier:
741 const_or_volatile_or_space_identifier_noopt
746 { push_type (tp_pointer); $$ = 0; }
748 { push_type (tp_pointer); $$ = $2; }
750 { push_type (tp_reference); $$ = 0; }
752 { push_type (tp_reference); $$ = $2; }
756 direct_abs_decl: '(' abs_decl ')'
758 | direct_abs_decl array_mod
761 push_type (tp_array);
766 push_type (tp_array);
770 | direct_abs_decl func_mod
771 { push_type (tp_function); }
773 { push_type (tp_function); }
784 | '(' nonempty_typelist ')'
785 { free ($2); $$ = 0; }
788 /* We used to try to recognize more pointer to member types here, but
789 that didn't work (shift/reduce conflicts meant that these rules never
790 got executed). The problem is that
791 int (foo::bar::baz::bizzle)
792 is a function type but
793 int (foo::bar::baz::bizzle::*)
794 is a pointer to member type. Stroustrup loses again! */
797 | typebase COLONCOLON '*'
798 { $$ = lookup_member_type (builtin_type_int, $1); }
801 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
805 { $$ = builtin_type_int; }
807 { $$ = builtin_type_long; }
809 { $$ = builtin_type_short; }
811 { $$ = builtin_type_long; }
812 | LONG SIGNED_KEYWORD INT_KEYWORD
813 { $$ = builtin_type_long; }
814 | LONG SIGNED_KEYWORD
815 { $$ = builtin_type_long; }
816 | SIGNED_KEYWORD LONG INT_KEYWORD
817 { $$ = builtin_type_long; }
818 | UNSIGNED LONG INT_KEYWORD
819 { $$ = builtin_type_unsigned_long; }
820 | LONG UNSIGNED INT_KEYWORD
821 { $$ = builtin_type_unsigned_long; }
823 { $$ = builtin_type_unsigned_long; }
825 { $$ = builtin_type_long_long; }
826 | LONG LONG INT_KEYWORD
827 { $$ = builtin_type_long_long; }
828 | LONG LONG SIGNED_KEYWORD INT_KEYWORD
829 { $$ = builtin_type_long_long; }
830 | LONG LONG SIGNED_KEYWORD
831 { $$ = builtin_type_long_long; }
832 | SIGNED_KEYWORD LONG LONG
833 { $$ = builtin_type_long_long; }
834 | SIGNED_KEYWORD LONG LONG INT_KEYWORD
835 { $$ = builtin_type_long_long; }
837 { $$ = builtin_type_unsigned_long_long; }
838 | UNSIGNED LONG LONG INT_KEYWORD
839 { $$ = builtin_type_unsigned_long_long; }
841 { $$ = builtin_type_unsigned_long_long; }
842 | LONG LONG UNSIGNED INT_KEYWORD
843 { $$ = builtin_type_unsigned_long_long; }
845 { $$ = builtin_type_short; }
846 | SHORT SIGNED_KEYWORD INT_KEYWORD
847 { $$ = builtin_type_short; }
848 | SHORT SIGNED_KEYWORD
849 { $$ = builtin_type_short; }
850 | UNSIGNED SHORT INT_KEYWORD
851 { $$ = builtin_type_unsigned_short; }
853 { $$ = builtin_type_unsigned_short; }
854 | SHORT UNSIGNED INT_KEYWORD
855 { $$ = builtin_type_unsigned_short; }
857 { $$ = builtin_type_double; }
858 | LONG DOUBLE_KEYWORD
859 { $$ = builtin_type_long_double; }
861 { $$ = lookup_struct (copy_name ($2),
862 expression_context_block); }
864 { $$ = lookup_struct (copy_name ($2),
865 expression_context_block); }
867 { $$ = lookup_union (copy_name ($2),
868 expression_context_block); }
870 { $$ = lookup_enum (copy_name ($2),
871 expression_context_block); }
873 { $$ = lookup_unsigned_typename (TYPE_NAME($2.type)); }
875 { $$ = builtin_type_unsigned_int; }
876 | SIGNED_KEYWORD typename
877 { $$ = lookup_signed_typename (TYPE_NAME($2.type)); }
879 { $$ = builtin_type_int; }
880 /* It appears that this rule for templates is never
881 reduced; template recognition happens by lookahead
882 in the token processing code in yylex. */
883 | TEMPLATE name '<' type '>'
884 { $$ = lookup_template_type(copy_name($2), $4,
885 expression_context_block);
887 | const_or_volatile_or_space_identifier_noopt typebase
888 { $$ = follow_types ($2); }
889 | typebase const_or_volatile_or_space_identifier_noopt
890 { $$ = follow_types ($1); }
896 $$.stoken.ptr = "int";
897 $$.stoken.length = 3;
898 $$.type = builtin_type_int;
902 $$.stoken.ptr = "long";
903 $$.stoken.length = 4;
904 $$.type = builtin_type_long;
908 $$.stoken.ptr = "short";
909 $$.stoken.length = 5;
910 $$.type = builtin_type_short;
916 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
917 $<ivec>$[0] = 1; /* Number of types in vector */
920 | nonempty_typelist ',' type
921 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
922 $$ = (struct type **) realloc ((char *) $1, len);
923 $$[$<ivec>$[0]] = $3;
928 | ptype const_or_volatile_or_space_identifier abs_decl const_or_volatile_or_space_identifier
929 { $$ = follow_types ($1); }
932 const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
933 | VOLATILE_KEYWORD CONST_KEYWORD
936 const_or_volatile_noopt: const_and_volatile
937 { push_type (tp_const);
938 push_type (tp_volatile);
941 { push_type (tp_const); }
943 { push_type (tp_volatile); }
946 name : NAME { $$ = $1.stoken; }
947 | BLOCKNAME { $$ = $1.stoken; }
948 | TYPENAME { $$ = $1.stoken; }
949 | NAME_OR_INT { $$ = $1.stoken; }
952 name_not_typename : NAME
954 /* These would be useful if name_not_typename was useful, but it is just
955 a fake for "variable", so these cause reduce/reduce conflicts because
956 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
957 =exp) or just an exp. If name_not_typename was ever used in an lvalue
958 context where only a name could occur, this might be useful.
965 /* Take care of parsing a number (anything that starts with a digit).
966 Set yylval and return the token type; update lexptr.
967 LEN is the number of characters in it. */
969 /*** Needs some error checking for the float case ***/
972 parse_number (p, len, parsed_float, putithere)
978 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
979 here, and we do kind of silly things like cast to unsigned. */
980 register LONGEST n = 0;
981 register LONGEST prevn = 0;
986 register int base = input_radix;
989 /* Number of "L" suffixes encountered. */
992 /* We have found a "L" or "U" suffix. */
993 int found_suffix = 0;
996 struct type *signed_type;
997 struct type *unsigned_type;
1001 /* It's a float since it contains a point or an exponent. */
1003 int num = 0; /* number of tokens scanned by scanf */
1004 char saved_char = p[len];
1006 p[len] = 0; /* null-terminate the token */
1007 if (sizeof (putithere->typed_val_float.dval) <= sizeof (float))
1008 num = sscanf (p, "%g%c", (float *) &putithere->typed_val_float.dval,&c);
1009 else if (sizeof (putithere->typed_val_float.dval) <= sizeof (double))
1010 num = sscanf (p, "%lg%c", (double *) &putithere->typed_val_float.dval,&c);
1013 #ifdef SCANF_HAS_LONG_DOUBLE
1014 num = sscanf (p, "%Lg%c", &putithere->typed_val_float.dval,&c);
1016 /* Scan it into a double, then assign it to the long double.
1017 This at least wins with values representable in the range
1020 num = sscanf (p, "%lg%c", &temp,&c);
1021 putithere->typed_val_float.dval = temp;
1024 p[len] = saved_char; /* restore the input stream */
1025 if (num != 1) /* check scanf found ONLY a float ... */
1027 /* See if it has `f' or `l' suffix (float or long double). */
1029 c = tolower (p[len - 1]);
1032 putithere->typed_val_float.type = builtin_type_float;
1034 putithere->typed_val_float.type = builtin_type_long_double;
1035 else if (isdigit (c) || c == '.')
1036 putithere->typed_val_float.type = builtin_type_double;
1043 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1077 if (c >= 'A' && c <= 'Z')
1079 if (c != 'l' && c != 'u')
1081 if (c >= '0' && c <= '9')
1089 if (base > 10 && c >= 'a' && c <= 'f')
1093 n += i = c - 'a' + 10;
1106 return ERROR; /* Char not a digit */
1109 return ERROR; /* Invalid digit in this base */
1111 /* Portably test for overflow (only works for nonzero values, so make
1112 a second check for zero). FIXME: Can't we just make n and prevn
1113 unsigned and avoid this? */
1114 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1115 unsigned_p = 1; /* Try something unsigned */
1117 /* Portably test for unsigned overflow.
1118 FIXME: This check is wrong; for example it doesn't find overflow
1119 on 0x123456789 when LONGEST is 32 bits. */
1120 if (c != 'l' && c != 'u' && n != 0)
1122 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
1123 error ("Numeric constant too large.");
1128 /* An integer constant is an int, a long, or a long long. An L
1129 suffix forces it to be long; an LL suffix forces it to be long
1130 long. If not forced to a larger size, it gets the first type of
1131 the above that it fits in. To figure out whether it fits, we
1132 shift it right and see whether anything remains. Note that we
1133 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1134 operation, because many compilers will warn about such a shift
1135 (which always produces a zero result). Sometimes TARGET_INT_BIT
1136 or TARGET_LONG_BIT will be that big, sometimes not. To deal with
1137 the case where it is we just always shift the value more than
1138 once, with fewer bits each time. */
1140 un = (ULONGEST)n >> 2;
1142 && (un >> (TARGET_INT_BIT - 2)) == 0)
1144 high_bit = ((ULONGEST)1) << (TARGET_INT_BIT-1);
1146 /* A large decimal (not hex or octal) constant (between INT_MAX
1147 and UINT_MAX) is a long or unsigned long, according to ANSI,
1148 never an unsigned int, but this code treats it as unsigned
1149 int. This probably should be fixed. GCC gives a warning on
1152 unsigned_type = builtin_type_unsigned_int;
1153 signed_type = builtin_type_int;
1155 else if (long_p <= 1
1156 && (un >> (TARGET_LONG_BIT - 2)) == 0)
1158 high_bit = ((ULONGEST)1) << (TARGET_LONG_BIT-1);
1159 unsigned_type = builtin_type_unsigned_long;
1160 signed_type = builtin_type_long;
1165 if (sizeof (ULONGEST) * HOST_CHAR_BIT < TARGET_LONG_LONG_BIT)
1166 /* A long long does not fit in a LONGEST. */
1167 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1169 shift = (TARGET_LONG_LONG_BIT - 1);
1170 high_bit = (ULONGEST) 1 << shift;
1171 unsigned_type = builtin_type_unsigned_long_long;
1172 signed_type = builtin_type_long_long;
1175 putithere->typed_val_int.val = n;
1177 /* If the high bit of the worked out type is set then this number
1178 has to be unsigned. */
1180 if (unsigned_p || (n & high_bit))
1182 putithere->typed_val_int.type = unsigned_type;
1186 putithere->typed_val_int.type = signed_type;
1196 enum exp_opcode opcode;
1199 static const struct token tokentab3[] =
1201 {">>=", ASSIGN_MODIFY, BINOP_RSH},
1202 {"<<=", ASSIGN_MODIFY, BINOP_LSH}
1205 static const struct token tokentab2[] =
1207 {"+=", ASSIGN_MODIFY, BINOP_ADD},
1208 {"-=", ASSIGN_MODIFY, BINOP_SUB},
1209 {"*=", ASSIGN_MODIFY, BINOP_MUL},
1210 {"/=", ASSIGN_MODIFY, BINOP_DIV},
1211 {"%=", ASSIGN_MODIFY, BINOP_REM},
1212 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR},
1213 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND},
1214 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR},
1215 {"++", INCREMENT, BINOP_END},
1216 {"--", DECREMENT, BINOP_END},
1217 {"->", ARROW, BINOP_END},
1218 {"&&", ANDAND, BINOP_END},
1219 {"||", OROR, BINOP_END},
1220 {"::", COLONCOLON, BINOP_END},
1221 {"<<", LSH, BINOP_END},
1222 {">>", RSH, BINOP_END},
1223 {"==", EQUAL, BINOP_END},
1224 {"!=", NOTEQUAL, BINOP_END},
1225 {"<=", LEQ, BINOP_END},
1226 {">=", GEQ, BINOP_END}
1229 /* Read one token, getting characters through lexptr. */
1240 static char *tempbuf;
1241 static int tempbufsize;
1242 struct symbol * sym_class = NULL;
1243 char * token_string = NULL;
1244 int class_prefix = 0;
1249 /* Check if this is a macro invocation that we need to expand. */
1250 if (! scanning_macro_expansion ())
1252 char *expanded = macro_expand_next (&lexptr,
1253 expression_macro_lookup_func,
1254 expression_macro_lookup_baton);
1257 scan_macro_expansion (expanded);
1260 prev_lexptr = lexptr;
1264 /* See if it is a special token of length 3. */
1265 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
1266 if (STREQN (tokstart, tokentab3[i].operator, 3))
1269 yylval.opcode = tokentab3[i].opcode;
1270 return tokentab3[i].token;
1273 /* See if it is a special token of length 2. */
1274 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
1275 if (STREQN (tokstart, tokentab2[i].operator, 2))
1278 yylval.opcode = tokentab2[i].opcode;
1279 return tokentab2[i].token;
1282 switch (c = *tokstart)
1285 /* If we were just scanning the result of a macro expansion,
1286 then we need to resume scanning the original text.
1287 Otherwise, we were already scanning the original text, and
1288 we're really done. */
1289 if (scanning_macro_expansion ())
1291 finished_macro_expansion ();
1304 /* We either have a character constant ('0' or '\177' for example)
1305 or we have a quoted symbol reference ('foo(int,int)' in C++
1310 c = parse_escape (&lexptr);
1312 error ("Empty character constant.");
1313 else if (! host_char_to_target (c, &c))
1315 int toklen = lexptr - tokstart + 1;
1316 char *tok = alloca (toklen + 1);
1317 memcpy (tok, tokstart, toklen);
1319 error ("There is no character corresponding to %s in the target "
1320 "character set `%s'.", tok, target_charset ());
1323 yylval.typed_val_int.val = c;
1324 yylval.typed_val_int.type = builtin_type_char;
1329 namelen = skip_quoted (tokstart) - tokstart;
1332 lexptr = tokstart + namelen;
1334 if (lexptr[-1] != '\'')
1335 error ("Unmatched single quote.");
1340 error ("Invalid character constant.");
1350 if (paren_depth == 0)
1357 if (comma_terminates
1359 && ! scanning_macro_expansion ())
1365 /* Might be a floating point number. */
1366 if (lexptr[1] < '0' || lexptr[1] > '9')
1367 goto symbol; /* Nope, must be a symbol. */
1368 /* FALL THRU into number case. */
1381 /* It's a number. */
1382 int got_dot = 0, got_e = 0, toktype;
1383 register char *p = tokstart;
1384 int hex = input_radix > 10;
1386 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1391 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1399 /* This test includes !hex because 'e' is a valid hex digit
1400 and thus does not indicate a floating point number when
1401 the radix is hex. */
1402 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1403 got_dot = got_e = 1;
1404 /* This test does not include !hex, because a '.' always indicates
1405 a decimal floating point number regardless of the radix. */
1406 else if (!got_dot && *p == '.')
1408 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1409 && (*p == '-' || *p == '+'))
1410 /* This is the sign of the exponent, not the end of the
1413 /* We will take any letters or digits. parse_number will
1414 complain if past the radix, or if L or U are not final. */
1415 else if ((*p < '0' || *p > '9')
1416 && ((*p < 'a' || *p > 'z')
1417 && (*p < 'A' || *p > 'Z')))
1420 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
1421 if (toktype == ERROR)
1423 char *err_copy = (char *) alloca (p - tokstart + 1);
1425 memcpy (err_copy, tokstart, p - tokstart);
1426 err_copy[p - tokstart] = 0;
1427 error ("Invalid number \"%s\".", err_copy);
1459 /* Build the gdb internal form of the input string in tempbuf,
1460 translating any standard C escape forms seen. Note that the
1461 buffer is null byte terminated *only* for the convenience of
1462 debugging gdb itself and printing the buffer contents when
1463 the buffer contains no embedded nulls. Gdb does not depend
1464 upon the buffer being null byte terminated, it uses the length
1465 string instead. This allows gdb to handle C strings (as well
1466 as strings in other languages) with embedded null bytes */
1468 tokptr = ++tokstart;
1472 char *char_start_pos = tokptr;
1474 /* Grow the static temp buffer if necessary, including allocating
1475 the first one on demand. */
1476 if (tempbufindex + 1 >= tempbufsize)
1478 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1484 /* Do nothing, loop will terminate. */
1488 c = parse_escape (&tokptr);
1493 tempbuf[tempbufindex++] = c;
1497 if (! host_char_to_target (c, &c))
1499 int len = tokptr - char_start_pos;
1500 char *copy = alloca (len + 1);
1501 memcpy (copy, char_start_pos, len);
1504 error ("There is no character corresponding to `%s' "
1505 "in the target character set `%s'.",
1506 copy, target_charset ());
1508 tempbuf[tempbufindex++] = c;
1511 } while ((*tokptr != '"') && (*tokptr != '\0'));
1512 if (*tokptr++ != '"')
1514 error ("Unterminated string in expression.");
1516 tempbuf[tempbufindex] = '\0'; /* See note above */
1517 yylval.sval.ptr = tempbuf;
1518 yylval.sval.length = tempbufindex;
1523 if (!(c == '_' || c == '$'
1524 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1525 /* We must have come across a bad character (e.g. ';'). */
1526 error ("Invalid character '%c' in expression.", c);
1528 /* It's a name. See how long it is. */
1530 for (c = tokstart[namelen];
1531 (c == '_' || c == '$' || (c >= '0' && c <= '9')
1532 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1534 /* Template parameter lists are part of the name.
1535 FIXME: This mishandles `print $a<4&&$a>3'. */
1539 /* Scan ahead to get rest of the template specification. Note
1540 that we look ahead only when the '<' adjoins non-whitespace
1541 characters; for comparison expressions, e.g. "a < b > c",
1542 there must be spaces before the '<', etc. */
1544 char * p = find_template_name_end (tokstart + namelen);
1546 namelen = p - tokstart;
1549 c = tokstart[++namelen];
1552 /* The token "if" terminates the expression and is NOT removed from
1553 the input stream. It doesn't count if it appears in the
1554 expansion of a macro. */
1556 && tokstart[0] == 'i'
1557 && tokstart[1] == 'f'
1558 && ! scanning_macro_expansion ())
1567 /* Catch specific keywords. Should be done with a data structure. */
1571 if (STREQN (tokstart, "unsigned", 8))
1573 if (current_language->la_language == language_cplus
1574 && STREQN (tokstart, "template", 8))
1576 if (STREQN (tokstart, "volatile", 8))
1577 return VOLATILE_KEYWORD;
1580 if (STREQN (tokstart, "struct", 6))
1582 if (STREQN (tokstart, "signed", 6))
1583 return SIGNED_KEYWORD;
1584 if (STREQN (tokstart, "sizeof", 6))
1586 if (STREQN (tokstart, "double", 6))
1587 return DOUBLE_KEYWORD;
1590 if (current_language->la_language == language_cplus)
1592 if (STREQN (tokstart, "false", 5))
1593 return FALSEKEYWORD;
1594 if (STREQN (tokstart, "class", 5))
1597 if (STREQN (tokstart, "union", 5))
1599 if (STREQN (tokstart, "short", 5))
1601 if (STREQN (tokstart, "const", 5))
1602 return CONST_KEYWORD;
1605 if (STREQN (tokstart, "enum", 4))
1607 if (STREQN (tokstart, "long", 4))
1609 if (current_language->la_language == language_cplus)
1611 if (STREQN (tokstart, "true", 4))
1616 if (STREQN (tokstart, "int", 3))
1623 yylval.sval.ptr = tokstart;
1624 yylval.sval.length = namelen;
1626 if (*tokstart == '$')
1628 write_dollar_variable (yylval.sval);
1632 /* Look ahead and see if we can consume more of the input
1633 string to get a reasonable class/namespace spec or a
1634 fully-qualified name. This is a kludge to get around the
1635 HP aCC compiler's generation of symbol names with embedded
1636 colons for namespace and nested classes. */
1639 /* Only do it if not inside single quotes */
1640 sym_class = parse_nested_classes_for_hpacc (yylval.sval.ptr, yylval.sval.length,
1641 &token_string, &class_prefix, &lexptr);
1644 /* Replace the current token with the bigger one we found */
1645 yylval.sval.ptr = token_string;
1646 yylval.sval.length = strlen (token_string);
1650 /* Use token-type BLOCKNAME for symbols that happen to be defined as
1651 functions or symtabs. If this is not so, then ...
1652 Use token-type TYPENAME for symbols that happen to be defined
1653 currently as names of types; NAME for other symbols.
1654 The caller is not constrained to care about the distinction. */
1656 char *tmp = copy_name (yylval.sval);
1658 int is_a_field_of_this = 0;
1661 sym = lookup_symbol (tmp, expression_context_block,
1663 current_language->la_language == language_cplus
1664 ? &is_a_field_of_this : (int *) NULL,
1665 (struct symtab **) NULL);
1666 /* Call lookup_symtab, not lookup_partial_symtab, in case there are
1667 no psymtabs (coff, xcoff, or some future change to blow away the
1668 psymtabs once once symbols are read). */
1669 if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
1671 yylval.ssym.sym = sym;
1672 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1676 { /* See if it's a file name. */
1677 struct symtab *symtab;
1679 symtab = lookup_symtab (tmp);
1683 yylval.bval = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), STATIC_BLOCK);
1688 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1691 /* Despite the following flaw, we need to keep this code enabled.
1692 Because we can get called from check_stub_method, if we don't
1693 handle nested types then it screws many operations in any
1694 program which uses nested types. */
1695 /* In "A::x", if x is a member function of A and there happens
1696 to be a type (nested or not, since the stabs don't make that
1697 distinction) named x, then this code incorrectly thinks we
1698 are dealing with nested types rather than a member function. */
1702 struct symbol *best_sym;
1704 /* Look ahead to detect nested types. This probably should be
1705 done in the grammar, but trying seemed to introduce a lot
1706 of shift/reduce and reduce/reduce conflicts. It's possible
1707 that it could be done, though. Or perhaps a non-grammar, but
1708 less ad hoc, approach would work well. */
1710 /* Since we do not currently have any way of distinguishing
1711 a nested type from a non-nested one (the stabs don't tell
1712 us whether a type is nested), we just ignore the
1719 /* Skip whitespace. */
1720 while (*p == ' ' || *p == '\t' || *p == '\n')
1722 if (*p == ':' && p[1] == ':')
1724 /* Skip the `::'. */
1726 /* Skip whitespace. */
1727 while (*p == ' ' || *p == '\t' || *p == '\n')
1730 while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1731 || (*p >= 'a' && *p <= 'z')
1732 || (*p >= 'A' && *p <= 'Z'))
1736 struct symbol *cur_sym;
1737 /* As big as the whole rest of the expression, which is
1738 at least big enough. */
1739 char *ncopy = alloca (strlen (tmp)+strlen (namestart)+3);
1743 memcpy (tmp1, tmp, strlen (tmp));
1744 tmp1 += strlen (tmp);
1745 memcpy (tmp1, "::", 2);
1747 memcpy (tmp1, namestart, p - namestart);
1748 tmp1[p - namestart] = '\0';
1749 cur_sym = lookup_symbol (ncopy, expression_context_block,
1750 VAR_DOMAIN, (int *) NULL,
1751 (struct symtab **) NULL);
1754 if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1772 yylval.tsym.type = SYMBOL_TYPE (best_sym);
1774 yylval.tsym.type = SYMBOL_TYPE (sym);
1778 if ((yylval.tsym.type = lookup_primitive_typename (tmp)) != 0)
1781 /* Input names that aren't symbols but ARE valid hex numbers,
1782 when the input radix permits them, can be names or numbers
1783 depending on the parse. Note we support radixes > 16 here. */
1785 ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1786 (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1788 YYSTYPE newlval; /* Its value is ignored. */
1789 hextype = parse_number (tokstart, namelen, 0, &newlval);
1792 yylval.ssym.sym = sym;
1793 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1798 /* Any other kind of symbol */
1799 yylval.ssym.sym = sym;
1800 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1810 lexptr = prev_lexptr;
1812 error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);