1 /* YACC parser for C expressions, for GDB.
3 Copyright (C) 1986, 1989, 1990, 1991, 1993, 1994, 2002, 2006, 2007, 2008,
4 2009, 2010, 2011 Free Software Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Parse a C expression from text in a string, and return the result
20 as a struct expression pointer. That structure contains arithmetic
21 operations in reverse polish, with constants represented by
22 operations that are followed by special data. See expression.h for
23 the details of the format. What is important here is that it can
24 be built up sequentially during the process of parsing; the lower
25 levels of the tree always come first in the result.
27 Note that malloc's and realloc's in this file are transformed to
28 xmalloc and xrealloc respectively by the same sed command in the
29 makefile that remaps any other malloc/realloc inserted by the
30 parser generator. Doing this with #defines and trying to control
31 the interaction with include files (<malloc.h> and <stdlib.h> for
32 example) just became too messy, particularly when such includes can
33 be inserted at random times by the parser generator. */
38 #include "gdb_string.h"
40 #include "expression.h"
42 #include "objc-lang.h" /* For objc language constructs. */
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. */
52 #include "completer.h" /* For skip_quoted(). */
55 #define parse_type builtin_type (parse_gdbarch)
57 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
58 etc), as well as gratuitiously global symbol names, so we can have
59 multiple yacc generated parsers in gdb. Note that these are only
60 the variables produced by yacc. If other parser generators (bison,
61 byacc, etc) produce additional global names that conflict at link
62 time, then those parser generators need to be fixed instead of
63 adding those names to this list. */
65 #define yymaxdepth objc_maxdepth
66 #define yyparse objc_parse
67 #define yylex objc_lex
68 #define yyerror objc_error
69 #define yylval objc_lval
70 #define yychar objc_char
71 #define yydebug objc_debug
72 #define yypact objc_pact
75 #define yydef objc_def
76 #define yychk objc_chk
77 #define yypgo objc_pgo
78 #define yyact objc_act
79 #define yyexca objc_exca
80 #define yyerrflag objc_errflag
81 #define yynerrs objc_nerrs
85 #define yy_yys objc_yys
86 #define yystate objc_state
87 #define yytmp objc_tmp
89 #define yy_yyv objc_yyv
90 #define yyval objc_val
91 #define yylloc objc_lloc
92 #define yyreds objc_reds /* With YYDEBUG defined */
93 #define yytoks objc_toks /* With YYDEBUG defined */
94 #define yyname objc_name /* With YYDEBUG defined */
95 #define yyrule objc_rule /* With YYDEBUG defined */
96 #define yylhs objc_yylhs
97 #define yylen objc_yylen
98 #define yydefred objc_yydefred
99 #define yydgoto objc_yydgoto
100 #define yysindex objc_yysindex
101 #define yyrindex objc_yyrindex
102 #define yygindex objc_yygindex
103 #define yytable objc_yytable
104 #define yycheck objc_yycheck
107 #define YYDEBUG 0 /* Default to no yydebug support. */
112 static int yylex (void);
114 void yyerror (char *);
118 /* Although the yacc "value" of an expression is not used,
119 since the result is stored in the structure being created,
120 other node types do have values. */
137 struct symtoken ssym;
140 enum exp_opcode opcode;
141 struct internalvar *ivar;
142 struct objc_class_str class;
149 /* YYSTYPE gets defined by %union. */
150 static int parse_number (char *, int, int, YYSTYPE *);
153 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
155 %type <tval> type typebase
156 %type <tvec> nonempty_typelist
157 /* %type <bval> block */
159 /* Fancy type parsing. */
160 %type <voidval> func_mod direct_abs_decl abs_decl
162 %type <lval> array_mod
164 %token <typed_val_int> INT
165 %token <typed_val_float> FLOAT
167 /* Both NAME and TYPENAME tokens represent symbols in the input, and
168 both convey their data as strings. But a TYPENAME is a string that
169 happens to be defined as a typedef or builtin type name (such as
170 int or char) and a NAME is any other symbol. Contexts where this
171 distinction is not important can use the nonterminal "name", which
172 matches either NAME or TYPENAME. */
175 %token <sval> NSSTRING /* ObjC Foundation "NSString" literal */
176 %token <sval> SELECTOR /* ObjC "@selector" pseudo-operator */
177 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
178 %token <tsym> TYPENAME
179 %token <class> CLASSNAME /* ObjC Class name */
181 %type <ssym> name_not_typename
182 %type <tsym> typename
184 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
185 but which would parse as a valid number in the current input radix.
186 E.g. "c" when input_radix==16. Depending on the parse, it will be
187 turned into a name or into a number. */
189 %token <ssym> NAME_OR_INT
191 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
195 /* Special type cases, put in to allow the parser to distinguish
196 different legal basetypes. */
197 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
199 %token <voidval> VARIABLE
201 %token <opcode> ASSIGN_MODIFY
205 %right '=' ASSIGN_MODIFY
213 %left '<' '>' LEQ GEQ
218 %right UNARY INCREMENT DECREMENT
219 %right ARROW '.' '[' '('
220 %token <ssym> BLOCKNAME
232 { write_exp_elt_opcode(OP_TYPE);
233 write_exp_elt_type($1);
234 write_exp_elt_opcode(OP_TYPE);}
237 /* Expressions, including the comma operator. */
240 { write_exp_elt_opcode (BINOP_COMMA); }
243 /* Expressions, not including the comma operator. */
244 exp : '*' exp %prec UNARY
245 { write_exp_elt_opcode (UNOP_IND); }
248 exp : '&' exp %prec UNARY
249 { write_exp_elt_opcode (UNOP_ADDR); }
252 exp : '-' exp %prec UNARY
253 { write_exp_elt_opcode (UNOP_NEG); }
256 exp : '!' exp %prec UNARY
257 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
260 exp : '~' exp %prec UNARY
261 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
264 exp : INCREMENT exp %prec UNARY
265 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
268 exp : DECREMENT exp %prec UNARY
269 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
272 exp : exp INCREMENT %prec UNARY
273 { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
276 exp : exp DECREMENT %prec UNARY
277 { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
280 exp : SIZEOF exp %prec UNARY
281 { write_exp_elt_opcode (UNOP_SIZEOF); }
285 { write_exp_elt_opcode (STRUCTOP_PTR);
286 write_exp_string ($3);
287 write_exp_elt_opcode (STRUCTOP_PTR); }
290 exp : exp ARROW qualified_name
291 { /* exp->type::name becomes exp->*(&type::name) */
292 /* Note: this doesn't work if name is a
293 static member! FIXME */
294 write_exp_elt_opcode (UNOP_ADDR);
295 write_exp_elt_opcode (STRUCTOP_MPTR); }
297 exp : exp ARROW '*' exp
298 { write_exp_elt_opcode (STRUCTOP_MPTR); }
302 { write_exp_elt_opcode (STRUCTOP_STRUCT);
303 write_exp_string ($3);
304 write_exp_elt_opcode (STRUCTOP_STRUCT); }
308 exp : exp '.' qualified_name
309 { /* exp.type::name becomes exp.*(&type::name) */
310 /* Note: this doesn't work if name is a
311 static member! FIXME */
312 write_exp_elt_opcode (UNOP_ADDR);
313 write_exp_elt_opcode (STRUCTOP_MEMBER); }
316 exp : exp '.' '*' exp
317 { write_exp_elt_opcode (STRUCTOP_MEMBER); }
320 exp : exp '[' exp1 ']'
321 { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
324 * The rules below parse ObjC message calls of the form:
325 * '[' target selector {':' argument}* ']'
332 class = lookup_objc_class (parse_gdbarch,
333 copy_name ($2.stoken));
335 error (_("%s is not an ObjC Class"),
336 copy_name ($2.stoken));
337 write_exp_elt_opcode (OP_LONG);
338 write_exp_elt_type (parse_type->builtin_int);
339 write_exp_elt_longcst ((LONGEST) class);
340 write_exp_elt_opcode (OP_LONG);
344 { write_exp_elt_opcode (OP_OBJC_MSGCALL);
346 write_exp_elt_opcode (OP_OBJC_MSGCALL);
352 write_exp_elt_opcode (OP_LONG);
353 write_exp_elt_type (parse_type->builtin_int);
354 write_exp_elt_longcst ((LONGEST) $2.class);
355 write_exp_elt_opcode (OP_LONG);
359 { write_exp_elt_opcode (OP_OBJC_MSGCALL);
361 write_exp_elt_opcode (OP_OBJC_MSGCALL);
368 { write_exp_elt_opcode (OP_OBJC_MSGCALL);
370 write_exp_elt_opcode (OP_OBJC_MSGCALL);
375 { add_msglist(&$1, 0); }
383 msgarg : name ':' exp
384 { add_msglist(&$1, 1); }
385 | ':' exp /* Unnamed arg. */
386 { add_msglist(0, 1); }
387 | ',' exp /* Variable number of args. */
388 { add_msglist(0, 0); }
392 /* This is to save the value of arglist_len
393 being accumulated by an outer function call. */
394 { start_arglist (); }
395 arglist ')' %prec ARROW
396 { write_exp_elt_opcode (OP_FUNCALL);
397 write_exp_elt_longcst ((LONGEST) end_arglist ());
398 write_exp_elt_opcode (OP_FUNCALL); }
402 { start_arglist (); }
412 arglist : arglist ',' exp %prec ABOVE_COMMA
417 { $$ = end_arglist () - 1; }
419 exp : lcurly arglist rcurly %prec ARROW
420 { write_exp_elt_opcode (OP_ARRAY);
421 write_exp_elt_longcst ((LONGEST) 0);
422 write_exp_elt_longcst ((LONGEST) $3);
423 write_exp_elt_opcode (OP_ARRAY); }
426 exp : lcurly type rcurly exp %prec UNARY
427 { write_exp_elt_opcode (UNOP_MEMVAL);
428 write_exp_elt_type ($2);
429 write_exp_elt_opcode (UNOP_MEMVAL); }
432 exp : '(' type ')' exp %prec UNARY
433 { write_exp_elt_opcode (UNOP_CAST);
434 write_exp_elt_type ($2);
435 write_exp_elt_opcode (UNOP_CAST); }
442 /* Binary operators in order of decreasing precedence. */
445 { write_exp_elt_opcode (BINOP_REPEAT); }
449 { write_exp_elt_opcode (BINOP_MUL); }
453 { write_exp_elt_opcode (BINOP_DIV); }
457 { write_exp_elt_opcode (BINOP_REM); }
461 { write_exp_elt_opcode (BINOP_ADD); }
465 { write_exp_elt_opcode (BINOP_SUB); }
469 { write_exp_elt_opcode (BINOP_LSH); }
473 { write_exp_elt_opcode (BINOP_RSH); }
477 { write_exp_elt_opcode (BINOP_EQUAL); }
480 exp : exp NOTEQUAL exp
481 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
485 { write_exp_elt_opcode (BINOP_LEQ); }
489 { write_exp_elt_opcode (BINOP_GEQ); }
493 { write_exp_elt_opcode (BINOP_LESS); }
497 { write_exp_elt_opcode (BINOP_GTR); }
501 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
505 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
509 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
513 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
517 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
520 exp : exp '?' exp ':' exp %prec '?'
521 { write_exp_elt_opcode (TERNOP_COND); }
525 { write_exp_elt_opcode (BINOP_ASSIGN); }
528 exp : exp ASSIGN_MODIFY exp
529 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
530 write_exp_elt_opcode ($2);
531 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
535 { write_exp_elt_opcode (OP_LONG);
536 write_exp_elt_type ($1.type);
537 write_exp_elt_longcst ((LONGEST)($1.val));
538 write_exp_elt_opcode (OP_LONG); }
543 parse_number ($1.stoken.ptr,
544 $1.stoken.length, 0, &val);
545 write_exp_elt_opcode (OP_LONG);
546 write_exp_elt_type (val.typed_val_int.type);
547 write_exp_elt_longcst ((LONGEST)
548 val.typed_val_int.val);
549 write_exp_elt_opcode (OP_LONG);
555 { write_exp_elt_opcode (OP_DOUBLE);
556 write_exp_elt_type ($1.type);
557 write_exp_elt_dblcst ($1.dval);
558 write_exp_elt_opcode (OP_DOUBLE); }
565 /* Already written by write_dollar_variable. */
570 write_exp_elt_opcode (OP_OBJC_SELECTOR);
571 write_exp_string ($1);
572 write_exp_elt_opcode (OP_OBJC_SELECTOR); }
575 exp : SIZEOF '(' type ')' %prec UNARY
576 { write_exp_elt_opcode (OP_LONG);
577 write_exp_elt_type (parse_type->builtin_int);
579 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
580 write_exp_elt_opcode (OP_LONG); }
584 { /* C strings are converted into array
585 constants with an explicit null byte
586 added at the end. Thus the array upper
587 bound is the string length. There is no
588 such thing in C as a completely empty
590 char *sp = $1.ptr; int count = $1.length;
593 write_exp_elt_opcode (OP_LONG);
594 write_exp_elt_type (parse_type->builtin_char);
595 write_exp_elt_longcst ((LONGEST)(*sp++));
596 write_exp_elt_opcode (OP_LONG);
598 write_exp_elt_opcode (OP_LONG);
599 write_exp_elt_type (parse_type->builtin_char);
600 write_exp_elt_longcst ((LONGEST)'\0');
601 write_exp_elt_opcode (OP_LONG);
602 write_exp_elt_opcode (OP_ARRAY);
603 write_exp_elt_longcst ((LONGEST) 0);
604 write_exp_elt_longcst ((LONGEST) ($1.length));
605 write_exp_elt_opcode (OP_ARRAY); }
608 exp : NSSTRING /* ObjC NextStep NSString constant
609 * of the form '@' '"' string '"'.
611 { write_exp_elt_opcode (OP_OBJC_NSSTRING);
612 write_exp_string ($1);
613 write_exp_elt_opcode (OP_OBJC_NSSTRING); }
619 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
623 lookup_symtab (copy_name ($1.stoken));
625 $$ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (tem),
628 error (_("No file or function \"%s\"."),
629 copy_name ($1.stoken));
634 block : block COLONCOLON name
636 = lookup_symbol (copy_name ($3), $1,
637 VAR_DOMAIN, (int *) NULL);
638 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
639 error (_("No function \"%s\" in specified context."),
641 $$ = SYMBOL_BLOCK_VALUE (tem); }
644 variable: block COLONCOLON name
645 { struct symbol *sym;
646 sym = lookup_symbol (copy_name ($3), $1,
647 VAR_DOMAIN, (int *) NULL);
649 error (_("No symbol \"%s\" in specified context."),
652 write_exp_elt_opcode (OP_VAR_VALUE);
653 /* block_found is set by lookup_symbol. */
654 write_exp_elt_block (block_found);
655 write_exp_elt_sym (sym);
656 write_exp_elt_opcode (OP_VAR_VALUE); }
659 qualified_name: typebase COLONCOLON name
661 struct type *type = $1;
662 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
663 && TYPE_CODE (type) != TYPE_CODE_UNION)
664 error (_("`%s' is not defined as an aggregate type."),
667 write_exp_elt_opcode (OP_SCOPE);
668 write_exp_elt_type (type);
669 write_exp_string ($3);
670 write_exp_elt_opcode (OP_SCOPE);
672 | typebase COLONCOLON '~' name
674 struct type *type = $1;
675 struct stoken tmp_token;
676 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
677 && TYPE_CODE (type) != TYPE_CODE_UNION)
678 error (_("`%s' is not defined as an aggregate type."),
681 if (strcmp (type_name_no_tag (type), $4.ptr) != 0)
682 error (_("invalid destructor `%s::~%s'"),
683 type_name_no_tag (type), $4.ptr);
685 tmp_token.ptr = (char*) alloca ($4.length + 2);
686 tmp_token.length = $4.length + 1;
687 tmp_token.ptr[0] = '~';
688 memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
689 tmp_token.ptr[tmp_token.length] = 0;
690 write_exp_elt_opcode (OP_SCOPE);
691 write_exp_elt_type (type);
692 write_exp_string (tmp_token);
693 write_exp_elt_opcode (OP_SCOPE);
697 variable: qualified_name
700 char *name = copy_name ($2);
702 struct minimal_symbol *msymbol;
705 lookup_symbol (name, (const struct block *) NULL,
706 VAR_DOMAIN, (int *) NULL);
709 write_exp_elt_opcode (OP_VAR_VALUE);
710 write_exp_elt_block (NULL);
711 write_exp_elt_sym (sym);
712 write_exp_elt_opcode (OP_VAR_VALUE);
716 msymbol = lookup_minimal_symbol (name, NULL, NULL);
718 write_exp_msymbol (msymbol);
719 else if (!have_full_symbols ()
720 && !have_partial_symbols ())
721 error (_("No symbol table is loaded. "
722 "Use the \"file\" command."));
724 error (_("No symbol \"%s\" in current context."),
729 variable: name_not_typename
730 { struct symbol *sym = $1.sym;
734 if (symbol_read_needs_frame (sym))
736 if (innermost_block == 0 ||
737 contained_in (block_found,
739 innermost_block = block_found;
742 write_exp_elt_opcode (OP_VAR_VALUE);
743 /* We want to use the selected frame, not
744 another more inner frame which happens to
745 be in the same block. */
746 write_exp_elt_block (NULL);
747 write_exp_elt_sym (sym);
748 write_exp_elt_opcode (OP_VAR_VALUE);
750 else if ($1.is_a_field_of_this)
752 /* C++/ObjC: it hangs off of `this'/'self'.
753 Must not inadvertently convert from a
754 method call to data ref. */
755 if (innermost_block == 0 ||
756 contained_in (block_found, innermost_block))
757 innermost_block = block_found;
758 write_exp_elt_opcode (OP_OBJC_SELF);
759 write_exp_elt_opcode (OP_OBJC_SELF);
760 write_exp_elt_opcode (STRUCTOP_PTR);
761 write_exp_string ($1.stoken);
762 write_exp_elt_opcode (STRUCTOP_PTR);
766 struct minimal_symbol *msymbol;
767 char *arg = copy_name ($1.stoken);
770 lookup_minimal_symbol (arg, NULL, NULL);
772 write_exp_msymbol (msymbol);
773 else if (!have_full_symbols () &&
774 !have_partial_symbols ())
775 error (_("No symbol table is loaded. "
776 "Use the \"file\" command."));
778 error (_("No symbol \"%s\" in current context."),
779 copy_name ($1.stoken));
786 /* "const" and "volatile" are curently ignored. A type
787 qualifier before the type is currently handled in the
788 typebase rule. The reason for recognizing these here
789 (shift/reduce conflicts) might be obsolete now that some
790 pointer to member rules have been deleted. */
791 | typebase CONST_KEYWORD
792 | typebase VOLATILE_KEYWORD
794 { $$ = follow_types ($1); }
795 | typebase CONST_KEYWORD abs_decl
796 { $$ = follow_types ($1); }
797 | typebase VOLATILE_KEYWORD abs_decl
798 { $$ = follow_types ($1); }
802 { push_type (tp_pointer); $$ = 0; }
804 { push_type (tp_pointer); $$ = $2; }
806 { push_type (tp_reference); $$ = 0; }
808 { push_type (tp_reference); $$ = $2; }
812 direct_abs_decl: '(' abs_decl ')'
814 | direct_abs_decl array_mod
817 push_type (tp_array);
822 push_type (tp_array);
826 | direct_abs_decl func_mod
827 { push_type (tp_function); }
829 { push_type (tp_function); }
840 | '(' nonempty_typelist ')'
841 { free ($2); $$ = 0; }
844 /* We used to try to recognize more pointer to member types here, but
845 that didn't work (shift/reduce conflicts meant that these rules
846 never got executed). The problem is that
847 int (foo::bar::baz::bizzle)
848 is a function type but
849 int (foo::bar::baz::bizzle::*)
850 is a pointer to member type. Stroustrup loses again! */
855 typebase /* Implements (approximately): (type-qualifier)* type-specifier. */
861 error (_("No symbol \"%s\" in current context."),
862 copy_name($1.stoken));
867 { $$ = parse_type->builtin_int; }
869 { $$ = parse_type->builtin_long; }
871 { $$ = parse_type->builtin_short; }
873 { $$ = parse_type->builtin_long; }
874 | UNSIGNED LONG INT_KEYWORD
875 { $$ = parse_type->builtin_unsigned_long; }
877 { $$ = parse_type->builtin_long_long; }
878 | LONG LONG INT_KEYWORD
879 { $$ = parse_type->builtin_long_long; }
881 { $$ = parse_type->builtin_unsigned_long_long; }
882 | UNSIGNED LONG LONG INT_KEYWORD
883 { $$ = parse_type->builtin_unsigned_long_long; }
885 { $$ = parse_type->builtin_short; }
886 | UNSIGNED SHORT INT_KEYWORD
887 { $$ = parse_type->builtin_unsigned_short; }
889 { $$ = parse_type->builtin_double; }
890 | LONG DOUBLE_KEYWORD
891 { $$ = parse_type->builtin_long_double; }
893 { $$ = lookup_struct (copy_name ($2),
894 expression_context_block); }
896 { $$ = lookup_struct (copy_name ($2),
897 expression_context_block); }
899 { $$ = lookup_union (copy_name ($2),
900 expression_context_block); }
902 { $$ = lookup_enum (copy_name ($2),
903 expression_context_block); }
905 { $$ = lookup_unsigned_typename (parse_language,
907 TYPE_NAME($2.type)); }
909 { $$ = parse_type->builtin_unsigned_int; }
910 | SIGNED_KEYWORD typename
911 { $$ = lookup_signed_typename (parse_language,
913 TYPE_NAME($2.type)); }
915 { $$ = parse_type->builtin_int; }
916 | TEMPLATE name '<' type '>'
917 { $$ = lookup_template_type(copy_name($2), $4,
918 expression_context_block);
920 /* "const" and "volatile" are curently ignored. A type
921 qualifier after the type is handled in the ptype rule. I
922 think these could be too. */
923 | CONST_KEYWORD typebase { $$ = $2; }
924 | VOLATILE_KEYWORD typebase { $$ = $2; }
930 $$.stoken.ptr = "int";
931 $$.stoken.length = 3;
932 $$.type = parse_type->builtin_int;
936 $$.stoken.ptr = "long";
937 $$.stoken.length = 4;
938 $$.type = parse_type->builtin_long;
942 $$.stoken.ptr = "short";
943 $$.stoken.length = 5;
944 $$.type = parse_type->builtin_short;
950 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
951 $<ivec>$[0] = 1; /* Number of types in vector. */
954 | nonempty_typelist ',' type
955 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
956 $$ = (struct type **) realloc ((char *) $1, len);
957 $$[$<ivec>$[0]] = $3;
961 name : NAME { $$ = $1.stoken; }
962 | BLOCKNAME { $$ = $1.stoken; }
963 | TYPENAME { $$ = $1.stoken; }
964 | CLASSNAME { $$ = $1.stoken; }
965 | NAME_OR_INT { $$ = $1.stoken; }
968 name_not_typename : NAME
970 /* These would be useful if name_not_typename was useful, but it is
971 just a fake for "variable", so these cause reduce/reduce conflicts
972 because the parser can't tell whether NAME_OR_INT is a
973 name_not_typename (=variable, =exp) or just an exp. If
974 name_not_typename was ever used in an lvalue context where only a
975 name could occur, this might be useful. */
981 /* Take care of parsing a number (anything that starts with a digit).
982 Set yylval and return the token type; update lexptr. LEN is the
983 number of characters in it. */
985 /*** Needs some error checking for the float case. ***/
988 parse_number (p, len, parsed_float, putithere)
994 /* FIXME: Shouldn't these be unsigned? We don't deal with negative
995 values here, and we do kind of silly things like cast to
1003 int base = input_radix;
1006 /* Number of "L" suffixes encountered. */
1009 /* We have found a "L" or "U" suffix. */
1010 int found_suffix = 0;
1012 unsigned LONGEST high_bit;
1013 struct type *signed_type;
1014 struct type *unsigned_type;
1018 if (! parse_c_float (parse_gdbarch, p, len,
1019 &putithere->typed_val_float.dval,
1020 &putithere->typed_val_float.type))
1025 /* Handle base-switching prefixes 0x, 0t, 0d, and 0. */
1059 if (c >= 'A' && c <= 'Z')
1061 if (c != 'l' && c != 'u')
1063 if (c >= '0' && c <= '9')
1071 if (base > 10 && c >= 'a' && c <= 'f')
1075 n += i = c - 'a' + 10;
1088 return ERROR; /* Char not a digit. */
1091 return ERROR; /* Invalid digit in this base. */
1093 /* Portably test for overflow (only works for nonzero values, so
1094 make a second check for zero). FIXME: Can't we just make n
1095 and prevn unsigned and avoid this? */
1096 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1097 unsigned_p = 1; /* Try something unsigned. */
1099 /* Portably test for unsigned overflow.
1100 FIXME: This check is wrong; for example it doesn't find
1101 overflow on 0x123456789 when LONGEST is 32 bits. */
1102 if (c != 'l' && c != 'u' && n != 0)
1104 if ((unsigned_p && (unsigned LONGEST) prevn >= (unsigned LONGEST) n))
1105 error (_("Numeric constant too large."));
1110 /* An integer constant is an int, a long, or a long long. An L
1111 suffix forces it to be long; an LL suffix forces it to be long
1112 long. If not forced to a larger size, it gets the first type of
1113 the above that it fits in. To figure out whether it fits, we
1114 shift it right and see whether anything remains. Note that we
1115 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1116 operation, because many compilers will warn about such a shift
1117 (which always produces a zero result). Sometimes gdbarch_int_bit
1118 or gdbarch_long_int will be that big, sometimes not. To deal with
1119 the case where it is we just always shift the value more than
1120 once, with fewer bits each time. */
1122 un = (unsigned LONGEST)n >> 2;
1124 && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
1127 = ((unsigned LONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
1129 /* A large decimal (not hex or octal) constant (between INT_MAX
1130 and UINT_MAX) is a long or unsigned long, according to ANSI,
1131 never an unsigned int, but this code treats it as unsigned
1132 int. This probably should be fixed. GCC gives a warning on
1135 unsigned_type = parse_type->builtin_unsigned_int;
1136 signed_type = parse_type->builtin_int;
1138 else if (long_p <= 1
1139 && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
1142 = ((unsigned LONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
1143 unsigned_type = parse_type->builtin_unsigned_long;
1144 signed_type = parse_type->builtin_long;
1148 high_bit = (((unsigned LONGEST)1)
1149 << (gdbarch_long_long_bit (parse_gdbarch) - 32 - 1)
1153 /* A long long does not fit in a LONGEST. */
1155 (unsigned LONGEST)1 << (sizeof (LONGEST) * HOST_CHAR_BIT - 1);
1156 unsigned_type = parse_type->builtin_unsigned_long_long;
1157 signed_type = parse_type->builtin_long_long;
1160 putithere->typed_val_int.val = n;
1162 /* If the high bit of the worked out type is set then this number
1163 has to be unsigned. */
1165 if (unsigned_p || (n & high_bit))
1167 putithere->typed_val_int.type = unsigned_type;
1171 putithere->typed_val_int.type = signed_type;
1181 enum exp_opcode opcode;
1184 static const struct token tokentab3[] =
1186 {">>=", ASSIGN_MODIFY, BINOP_RSH},
1187 {"<<=", ASSIGN_MODIFY, BINOP_LSH}
1190 static const struct token tokentab2[] =
1192 {"+=", ASSIGN_MODIFY, BINOP_ADD},
1193 {"-=", ASSIGN_MODIFY, BINOP_SUB},
1194 {"*=", ASSIGN_MODIFY, BINOP_MUL},
1195 {"/=", ASSIGN_MODIFY, BINOP_DIV},
1196 {"%=", ASSIGN_MODIFY, BINOP_REM},
1197 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR},
1198 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND},
1199 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR},
1200 {"++", INCREMENT, BINOP_END},
1201 {"--", DECREMENT, BINOP_END},
1202 {"->", ARROW, BINOP_END},
1203 {"&&", ANDAND, BINOP_END},
1204 {"||", OROR, BINOP_END},
1205 {"::", COLONCOLON, BINOP_END},
1206 {"<<", LSH, BINOP_END},
1207 {">>", RSH, BINOP_END},
1208 {"==", EQUAL, BINOP_END},
1209 {"!=", NOTEQUAL, BINOP_END},
1210 {"<=", LEQ, BINOP_END},
1211 {">=", GEQ, BINOP_END}
1214 /* Read one token, getting characters through lexptr. */
1225 static char *tempbuf;
1226 static int tempbufsize;
1231 /* See if it is a special token of length 3. */
1232 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
1233 if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
1236 yylval.opcode = tokentab3[i].opcode;
1237 return tokentab3[i].token;
1240 /* See if it is a special token of length 2. */
1241 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
1242 if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
1245 yylval.opcode = tokentab2[i].opcode;
1246 return tokentab2[i].token;
1250 switch (tokchr = *tokstart)
1262 /* We either have a character constant ('0' or '\177' for
1263 example) or we have a quoted symbol reference ('foo(int,int)'
1264 in C++ for example). */
1268 c = parse_escape (parse_gdbarch, &lexptr);
1270 error (_("Empty character constant."));
1272 yylval.typed_val_int.val = c;
1273 yylval.typed_val_int.type = parse_type->builtin_char;
1278 namelen = skip_quoted (tokstart) - tokstart;
1281 lexptr = tokstart + namelen;
1282 if (lexptr[-1] != '\'')
1283 error (_("Unmatched single quote."));
1288 error (_("Invalid character constant."));
1298 if (paren_depth == 0)
1305 if (comma_terminates && paren_depth == 0)
1311 /* Might be a floating point number. */
1312 if (lexptr[1] < '0' || lexptr[1] > '9')
1313 goto symbol; /* Nope, must be a symbol. */
1314 /* FALL THRU into number case. */
1327 /* It's a number. */
1328 int got_dot = 0, got_e = 0, toktype = FLOAT;
1329 /* Initialize toktype to anything other than ERROR. */
1331 int hex = input_radix > 10;
1332 int local_radix = input_radix;
1333 if (tokchr == '0' && (p[1] == 'x' || p[1] == 'X'))
1339 else if (tokchr == '0' && (p[1]=='t' || p[1]=='T'
1340 || p[1]=='d' || p[1]=='D'))
1349 /* This test includes !hex because 'e' is a valid hex digit
1350 and thus does not indicate a floating point number when
1351 the radix is hex. */
1353 if (!hex && (*p == 'e' || *p == 'E'))
1355 toktype = ERROR; /* Only one 'e' in a float. */
1358 /* This test does not include !hex, because a '.' always
1359 indicates a decimal floating point number regardless of
1363 toktype = ERROR; /* Only one '.' in a float. */
1366 else if (got_e && (p[-1] == 'e' || p[-1] == 'E') &&
1367 (*p == '-' || *p == '+'))
1368 /* This is the sign of the exponent, not the end of the
1371 /* Always take decimal digits; parse_number handles radix
1373 else if (*p >= '0' && *p <= '9')
1375 /* We will take letters only if hex is true, and only up
1376 to what the input radix would permit. FSF was content
1377 to rely on parse_number to validate; but it leaks. */
1378 else if (*p >= 'a' && *p <= 'z')
1380 if (!hex || *p >= ('a' + local_radix - 10))
1383 else if (*p >= 'A' && *p <= 'Z')
1385 if (!hex || *p >= ('A' + local_radix - 10))
1390 if (toktype != ERROR)
1391 toktype = parse_number (tokstart, p - tokstart,
1392 got_dot | got_e, &yylval);
1393 if (toktype == ERROR)
1395 char *err_copy = (char *) alloca (p - tokstart + 1);
1397 memcpy (err_copy, tokstart, p - tokstart);
1398 err_copy[p - tokstart] = 0;
1399 error (_("Invalid number \"%s\"."), err_copy);
1416 case '@': /* Moved out below. */
1432 if (strncmp(tokstart, "@selector", 9) == 0)
1434 tokptr = strchr(tokstart, '(');
1437 error (_("Missing '(' in @selector(...)"));
1440 tokptr++; /* Skip the '('. */
1442 /* Grow the static temp buffer if necessary, including
1443 allocating the first one on demand. */
1444 if (tempbufindex + 1 >= tempbufsize)
1446 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1448 tempbuf[tempbufindex++] = *tokptr++;
1449 } while ((*tokptr != ')') && (*tokptr != '\0'));
1450 if (*tokptr++ != ')')
1452 error (_("Missing ')' in @selector(...)"));
1454 tempbuf[tempbufindex] = '\0';
1455 yylval.sval.ptr = tempbuf;
1456 yylval.sval.length = tempbufindex;
1460 if (tokstart[1] != '"')
1465 /* ObjC NextStep NSString constant: fall thru and parse like
1471 /* Build the gdb internal form of the input string in tempbuf,
1472 translating any standard C escape forms seen. Note that the
1473 buffer is null byte terminated *only* for the convenience of
1474 debugging gdb itself and printing the buffer contents when
1475 the buffer contains no embedded nulls. Gdb does not depend
1476 upon the buffer being null byte terminated, it uses the
1477 length string instead. This allows gdb to handle C strings
1478 (as well as strings in other languages) with embedded null
1481 tokptr = ++tokstart;
1485 /* Grow the static temp buffer if necessary, including
1486 allocating the first one on demand. */
1487 if (tempbufindex + 1 >= tempbufsize)
1489 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1495 /* Do nothing, loop will terminate. */
1499 c = parse_escape (parse_gdbarch, &tokptr);
1504 tempbuf[tempbufindex++] = c;
1507 tempbuf[tempbufindex++] = *tokptr++;
1510 } while ((*tokptr != '"') && (*tokptr != '\0'));
1511 if (*tokptr++ != '"')
1513 error (_("Unterminated string in expression."));
1515 tempbuf[tempbufindex] = '\0'; /* See note above. */
1516 yylval.sval.ptr = tempbuf;
1517 yylval.sval.length = tempbufindex;
1519 return (tokchr == '@' ? NSSTRING : STRING);
1522 if (!(tokchr == '_' || tokchr == '$' ||
1523 (tokchr >= 'a' && tokchr <= 'z') || (tokchr >= 'A' && tokchr <= 'Z')))
1524 /* We must have come across a bad character (e.g. ';'). */
1525 error (_("Invalid character '%c' in expression."), c);
1527 /* It's a name. See how long it is. */
1529 for (c = tokstart[namelen];
1530 (c == '_' || c == '$' || (c >= '0' && c <= '9')
1531 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1536 while (tokstart[++i] && tokstart[i] != '>');
1537 if (tokstart[i] == '>')
1540 c = tokstart[++namelen];
1543 /* The token "if" terminates the expression and is NOT
1544 removed from the input stream. */
1545 if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
1554 /* Catch specific keywords. Should be done with a data structure. */
1558 if (strncmp (tokstart, "unsigned", 8) == 0)
1560 if (parse_language->la_language == language_cplus
1561 && strncmp (tokstart, "template", 8) == 0)
1563 if (strncmp (tokstart, "volatile", 8) == 0)
1564 return VOLATILE_KEYWORD;
1567 if (strncmp (tokstart, "struct", 6) == 0)
1569 if (strncmp (tokstart, "signed", 6) == 0)
1570 return SIGNED_KEYWORD;
1571 if (strncmp (tokstart, "sizeof", 6) == 0)
1573 if (strncmp (tokstart, "double", 6) == 0)
1574 return DOUBLE_KEYWORD;
1577 if ((parse_language->la_language == language_cplus)
1578 && strncmp (tokstart, "class", 5) == 0)
1580 if (strncmp (tokstart, "union", 5) == 0)
1582 if (strncmp (tokstart, "short", 5) == 0)
1584 if (strncmp (tokstart, "const", 5) == 0)
1585 return CONST_KEYWORD;
1588 if (strncmp (tokstart, "enum", 4) == 0)
1590 if (strncmp (tokstart, "long", 4) == 0)
1594 if (strncmp (tokstart, "int", 3) == 0)
1601 yylval.sval.ptr = tokstart;
1602 yylval.sval.length = namelen;
1604 if (*tokstart == '$')
1606 write_dollar_variable (yylval.sval);
1610 /* Use token-type BLOCKNAME for symbols that happen to be defined as
1611 functions or symtabs. If this is not so, then ...
1612 Use token-type TYPENAME for symbols that happen to be defined
1613 currently as names of types; NAME for other symbols.
1614 The caller is not constrained to care about the distinction. */
1616 char *tmp = copy_name (yylval.sval);
1618 int is_a_field_of_this = 0, *need_this;
1621 if (parse_language->la_language == language_cplus ||
1622 parse_language->la_language == language_objc)
1623 need_this = &is_a_field_of_this;
1625 need_this = (int *) NULL;
1627 sym = lookup_symbol (tmp, expression_context_block,
1630 /* Call lookup_symtab, not lookup_partial_symtab, in case there
1631 are no psymtabs (coff, xcoff, or some future change to blow
1632 away the psymtabs once symbols are read). */
1633 if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK) ||
1634 lookup_symtab (tmp))
1636 yylval.ssym.sym = sym;
1637 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1640 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1643 /* Despite the following flaw, we need to keep this code
1644 enabled. Because we can get called from
1645 check_stub_method, if we don't handle nested types then
1646 it screws many operations in any program which uses
1648 /* In "A::x", if x is a member function of A and there
1649 happens to be a type (nested or not, since the stabs
1650 don't make that distinction) named x, then this code
1651 incorrectly thinks we are dealing with nested types
1652 rather than a member function. */
1656 struct symbol *best_sym;
1658 /* Look ahead to detect nested types. This probably should
1659 be done in the grammar, but trying seemed to introduce a
1660 lot of shift/reduce and reduce/reduce conflicts. It's
1661 possible that it could be done, though. Or perhaps a
1662 non-grammar, but less ad hoc, approach would work well. */
1664 /* Since we do not currently have any way of distinguishing
1665 a nested type from a non-nested one (the stabs don't tell
1666 us whether a type is nested), we just ignore the
1673 /* Skip whitespace. */
1674 while (*p == ' ' || *p == '\t' || *p == '\n')
1676 if (*p == ':' && p[1] == ':')
1678 /* Skip the `::'. */
1680 /* Skip whitespace. */
1681 while (*p == ' ' || *p == '\t' || *p == '\n')
1684 while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1685 || (*p >= 'a' && *p <= 'z')
1686 || (*p >= 'A' && *p <= 'Z'))
1690 struct symbol *cur_sym;
1691 /* As big as the whole rest of the expression,
1692 which is at least big enough. */
1693 char *ncopy = alloca (strlen (tmp) +
1694 strlen (namestart) + 3);
1698 memcpy (tmp1, tmp, strlen (tmp));
1699 tmp1 += strlen (tmp);
1700 memcpy (tmp1, "::", 2);
1702 memcpy (tmp1, namestart, p - namestart);
1703 tmp1[p - namestart] = '\0';
1704 cur_sym = lookup_symbol (ncopy,
1705 expression_context_block,
1706 VAR_DOMAIN, (int *) NULL);
1709 if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1727 yylval.tsym.type = SYMBOL_TYPE (best_sym);
1729 yylval.tsym.type = SYMBOL_TYPE (sym);
1734 = language_lookup_primitive_type_by_name (parse_language,
1735 parse_gdbarch, tmp);
1736 if (yylval.tsym.type != NULL)
1739 /* See if it's an ObjC classname. */
1742 CORE_ADDR Class = lookup_objc_class (parse_gdbarch, tmp);
1745 yylval.class.class = Class;
1746 if ((sym = lookup_struct_typedef (tmp,
1747 expression_context_block,
1749 yylval.class.type = SYMBOL_TYPE (sym);
1754 /* Input names that aren't symbols but ARE valid hex numbers,
1755 when the input radix permits them, can be names or numbers
1756 depending on the parse. Note we support radixes > 16 here. */
1758 ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1759 (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1761 YYSTYPE newlval; /* Its value is ignored. */
1762 hextype = parse_number (tokstart, namelen, 0, &newlval);
1765 yylval.ssym.sym = sym;
1766 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1771 /* Any other kind of symbol. */
1772 yylval.ssym.sym = sym;
1773 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1782 if (*lexptr == '\0')
1783 error(_("A %s near end of expression."), (msg ? msg : "error"));
1785 error (_("A %s in expression, near `%s'."), (msg ? msg : "error"),