1 /* YACC parser for C expressions, for GDB.
2 Copyright (C) 1986, 1989-2000, 2003-2004, 2006-2012 Free Software
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 /* Parse a C expression from text in a string,
21 and return the result as a struct expression pointer.
22 That structure contains arithmetic operations in reverse polish,
23 with constants represented by operations that are followed by special data.
24 See expression.h for the details of the format.
25 What is important here is that it can be built up sequentially
26 during the process of parsing; the lower levels of the tree always
27 come first in the result.
29 Note that malloc's and realloc's in this file are transformed to
30 xmalloc and xrealloc respectively by the same sed command in the
31 makefile that remaps any other malloc/realloc inserted by the parser
32 generator. Doing this with #defines and trying to control the interaction
33 with include files (<malloc.h> and <stdlib.h> for example) just became
34 too messy, particularly when such includes can be inserted at random
35 times by the parser generator. */
40 #include "gdb_string.h"
42 #include "expression.h"
44 #include "parser-defs.h"
47 #include "bfd.h" /* Required by objfiles.h. */
48 #include "symfile.h" /* Required by objfiles.h. */
49 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
52 #include "cp-support.h"
54 #include "gdb_assert.h"
55 #include "macroscope.h"
57 #define parse_type builtin_type (parse_gdbarch)
59 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
60 as well as gratuitiously global symbol names, so we can have multiple
61 yacc generated parsers in gdb. Note that these are only the variables
62 produced by yacc. If other parser generators (bison, byacc, etc) produce
63 additional global names that conflict at link time, then those parser
64 generators need to be fixed instead of adding those names to this list. */
66 #define yymaxdepth c_maxdepth
67 #define yyparse c_parse_internal
69 #define yyerror c_error
72 #define yydebug c_debug
81 #define yyerrflag c_errflag
82 #define yynerrs c_nerrs
87 #define yystate c_state
93 #define yyreds c_reds /* With YYDEBUG defined */
94 #define yytoks c_toks /* With YYDEBUG defined */
95 #define yyname c_name /* With YYDEBUG defined */
96 #define yyrule c_rule /* With YYDEBUG defined */
99 #define yydefred c_yydefred
100 #define yydgoto c_yydgoto
101 #define yysindex c_yysindex
102 #define yyrindex c_yyrindex
103 #define yygindex c_yygindex
104 #define yytable c_yytable
105 #define yycheck c_yycheck
107 #define yysslim c_yysslim
108 #define yyssp c_yyssp
109 #define yystacksize c_yystacksize
111 #define yyvsp c_yyvsp
114 #define YYDEBUG 1 /* Default to yydebug support */
117 #define YYFPRINTF parser_fprintf
121 static int yylex (void);
123 void yyerror (char *);
127 /* Although the yacc "value" of an expression is not used,
128 since the result is stored in the structure being created,
129 other node types do have values. */
145 } typed_val_decfloat;
149 struct typed_stoken tsval;
151 struct symtoken ssym;
154 enum exp_opcode opcode;
155 struct internalvar *ivar;
157 struct stoken_vector svec;
163 /* YYSTYPE gets defined by %union */
164 static int parse_number (char *, int, int, YYSTYPE *);
165 static struct stoken operator_stoken (const char *);
168 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
170 %type <tval> type typebase
171 %type <tvec> nonempty_typelist
172 /* %type <bval> block */
174 /* Fancy type parsing. */
175 %type <voidval> func_mod direct_abs_decl abs_decl
177 %type <lval> array_mod
179 %token <typed_val_int> INT
180 %token <typed_val_float> FLOAT
181 %token <typed_val_decfloat> DECFLOAT
183 /* Both NAME and TYPENAME tokens represent symbols in the input,
184 and both convey their data as strings.
185 But a TYPENAME is a string that happens to be defined as a typedef
186 or builtin type name (such as int or char)
187 and a NAME is any other symbol.
188 Contexts where this distinction is not important can use the
189 nonterminal "name", which matches either NAME or TYPENAME. */
191 %token <tsval> STRING
193 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
194 %token <ssym> UNKNOWN_CPP_NAME
195 %token <voidval> COMPLETE
196 %token <tsym> TYPENAME
198 %type <svec> string_exp
199 %type <ssym> name_not_typename
200 %type <tsym> typename
202 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
203 but which would parse as a valid number in the current input radix.
204 E.g. "c" when input_radix==16. Depending on the parse, it will be
205 turned into a name or into a number. */
207 %token <ssym> NAME_OR_INT
210 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
214 %type <sval> operator
215 %token REINTERPRET_CAST DYNAMIC_CAST STATIC_CAST CONST_CAST
218 /* Special type cases, put in to allow the parser to distinguish different
220 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
222 %token <sval> VARIABLE
224 %token <opcode> ASSIGN_MODIFY
233 %right '=' ASSIGN_MODIFY
241 %left '<' '>' LEQ GEQ
246 %right UNARY INCREMENT DECREMENT
247 %right ARROW ARROW_STAR '.' DOT_STAR '[' '('
248 %token <ssym> BLOCKNAME
249 %token <bval> FILENAME
261 { write_exp_elt_opcode(OP_TYPE);
262 write_exp_elt_type($1);
263 write_exp_elt_opcode(OP_TYPE);}
266 /* Expressions, including the comma operator. */
269 { write_exp_elt_opcode (BINOP_COMMA); }
272 /* Expressions, not including the comma operator. */
273 exp : '*' exp %prec UNARY
274 { write_exp_elt_opcode (UNOP_IND); }
277 exp : '&' exp %prec UNARY
278 { write_exp_elt_opcode (UNOP_ADDR); }
281 exp : '-' exp %prec UNARY
282 { write_exp_elt_opcode (UNOP_NEG); }
285 exp : '+' exp %prec UNARY
286 { write_exp_elt_opcode (UNOP_PLUS); }
289 exp : '!' exp %prec UNARY
290 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
293 exp : '~' exp %prec UNARY
294 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
297 exp : INCREMENT exp %prec UNARY
298 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
301 exp : DECREMENT exp %prec UNARY
302 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
305 exp : exp INCREMENT %prec UNARY
306 { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
309 exp : exp DECREMENT %prec UNARY
310 { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
313 exp : SIZEOF exp %prec UNARY
314 { write_exp_elt_opcode (UNOP_SIZEOF); }
318 { write_exp_elt_opcode (STRUCTOP_PTR);
319 write_exp_string ($3);
320 write_exp_elt_opcode (STRUCTOP_PTR); }
323 exp : exp ARROW name COMPLETE
324 { mark_struct_expression ();
325 write_exp_elt_opcode (STRUCTOP_PTR);
326 write_exp_string ($3);
327 write_exp_elt_opcode (STRUCTOP_PTR); }
330 exp : exp ARROW COMPLETE
332 mark_struct_expression ();
333 write_exp_elt_opcode (STRUCTOP_PTR);
336 write_exp_string (s);
337 write_exp_elt_opcode (STRUCTOP_PTR); }
340 exp : exp ARROW qualified_name
341 { /* exp->type::name becomes exp->*(&type::name) */
342 /* Note: this doesn't work if name is a
343 static member! FIXME */
344 write_exp_elt_opcode (UNOP_ADDR);
345 write_exp_elt_opcode (STRUCTOP_MPTR); }
348 exp : exp ARROW_STAR exp
349 { write_exp_elt_opcode (STRUCTOP_MPTR); }
353 { write_exp_elt_opcode (STRUCTOP_STRUCT);
354 write_exp_string ($3);
355 write_exp_elt_opcode (STRUCTOP_STRUCT); }
358 exp : exp '.' name COMPLETE
359 { mark_struct_expression ();
360 write_exp_elt_opcode (STRUCTOP_STRUCT);
361 write_exp_string ($3);
362 write_exp_elt_opcode (STRUCTOP_STRUCT); }
365 exp : exp '.' COMPLETE
367 mark_struct_expression ();
368 write_exp_elt_opcode (STRUCTOP_STRUCT);
371 write_exp_string (s);
372 write_exp_elt_opcode (STRUCTOP_STRUCT); }
375 exp : exp '.' qualified_name
376 { /* exp.type::name becomes exp.*(&type::name) */
377 /* Note: this doesn't work if name is a
378 static member! FIXME */
379 write_exp_elt_opcode (UNOP_ADDR);
380 write_exp_elt_opcode (STRUCTOP_MEMBER); }
383 exp : exp DOT_STAR exp
384 { write_exp_elt_opcode (STRUCTOP_MEMBER); }
387 exp : exp '[' exp1 ']'
388 { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
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); }
401 exp : UNKNOWN_CPP_NAME '('
403 /* This could potentially be a an argument defined
404 lookup function (Koenig). */
405 write_exp_elt_opcode (OP_ADL_FUNC);
406 write_exp_elt_block (expression_context_block);
407 write_exp_elt_sym (NULL); /* Placeholder. */
408 write_exp_string ($1.stoken);
409 write_exp_elt_opcode (OP_ADL_FUNC);
411 /* This is to save the value of arglist_len
412 being accumulated by an outer function call. */
416 arglist ')' %prec ARROW
418 write_exp_elt_opcode (OP_FUNCALL);
419 write_exp_elt_longcst ((LONGEST) end_arglist ());
420 write_exp_elt_opcode (OP_FUNCALL);
425 { start_arglist (); }
435 arglist : arglist ',' exp %prec ABOVE_COMMA
439 exp : exp '(' nonempty_typelist ')' const_or_volatile
441 write_exp_elt_opcode (TYPE_INSTANCE);
442 write_exp_elt_longcst ((LONGEST) $<ivec>3[0]);
443 for (i = 0; i < $<ivec>3[0]; ++i)
444 write_exp_elt_type ($<tvec>3[i + 1]);
445 write_exp_elt_longcst((LONGEST) $<ivec>3[0]);
446 write_exp_elt_opcode (TYPE_INSTANCE);
452 { $$ = end_arglist () - 1; }
454 exp : lcurly arglist rcurly %prec ARROW
455 { write_exp_elt_opcode (OP_ARRAY);
456 write_exp_elt_longcst ((LONGEST) 0);
457 write_exp_elt_longcst ((LONGEST) $3);
458 write_exp_elt_opcode (OP_ARRAY); }
461 exp : lcurly type rcurly exp %prec UNARY
462 { write_exp_elt_opcode (UNOP_MEMVAL);
463 write_exp_elt_type ($2);
464 write_exp_elt_opcode (UNOP_MEMVAL); }
467 exp : '(' type ')' exp %prec UNARY
468 { write_exp_elt_opcode (UNOP_CAST);
469 write_exp_elt_type ($2);
470 write_exp_elt_opcode (UNOP_CAST); }
477 /* Binary operators in order of decreasing precedence. */
480 { write_exp_elt_opcode (BINOP_REPEAT); }
484 { write_exp_elt_opcode (BINOP_MUL); }
488 { write_exp_elt_opcode (BINOP_DIV); }
492 { write_exp_elt_opcode (BINOP_REM); }
496 { write_exp_elt_opcode (BINOP_ADD); }
500 { write_exp_elt_opcode (BINOP_SUB); }
504 { write_exp_elt_opcode (BINOP_LSH); }
508 { write_exp_elt_opcode (BINOP_RSH); }
512 { write_exp_elt_opcode (BINOP_EQUAL); }
515 exp : exp NOTEQUAL exp
516 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
520 { write_exp_elt_opcode (BINOP_LEQ); }
524 { write_exp_elt_opcode (BINOP_GEQ); }
528 { write_exp_elt_opcode (BINOP_LESS); }
532 { write_exp_elt_opcode (BINOP_GTR); }
536 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
540 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
544 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
548 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
552 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
555 exp : exp '?' exp ':' exp %prec '?'
556 { write_exp_elt_opcode (TERNOP_COND); }
560 { write_exp_elt_opcode (BINOP_ASSIGN); }
563 exp : exp ASSIGN_MODIFY exp
564 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
565 write_exp_elt_opcode ($2);
566 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
570 { write_exp_elt_opcode (OP_LONG);
571 write_exp_elt_type ($1.type);
572 write_exp_elt_longcst ((LONGEST)($1.val));
573 write_exp_elt_opcode (OP_LONG); }
578 struct stoken_vector vec;
581 write_exp_string_vector ($1.type, &vec);
587 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
588 write_exp_elt_opcode (OP_LONG);
589 write_exp_elt_type (val.typed_val_int.type);
590 write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
591 write_exp_elt_opcode (OP_LONG);
597 { write_exp_elt_opcode (OP_DOUBLE);
598 write_exp_elt_type ($1.type);
599 write_exp_elt_dblcst ($1.dval);
600 write_exp_elt_opcode (OP_DOUBLE); }
604 { write_exp_elt_opcode (OP_DECFLOAT);
605 write_exp_elt_type ($1.type);
606 write_exp_elt_decfloatcst ($1.val);
607 write_exp_elt_opcode (OP_DECFLOAT); }
615 write_dollar_variable ($1);
619 exp : SIZEOF '(' type ')' %prec UNARY
620 { write_exp_elt_opcode (OP_LONG);
621 write_exp_elt_type (lookup_signed_typename
622 (parse_language, parse_gdbarch,
625 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
626 write_exp_elt_opcode (OP_LONG); }
629 exp : REINTERPRET_CAST '<' type '>' '(' exp ')' %prec UNARY
630 { write_exp_elt_opcode (UNOP_REINTERPRET_CAST);
631 write_exp_elt_type ($3);
632 write_exp_elt_opcode (UNOP_REINTERPRET_CAST); }
635 exp : STATIC_CAST '<' type '>' '(' exp ')' %prec UNARY
636 { write_exp_elt_opcode (UNOP_CAST);
637 write_exp_elt_type ($3);
638 write_exp_elt_opcode (UNOP_CAST); }
641 exp : DYNAMIC_CAST '<' type '>' '(' exp ')' %prec UNARY
642 { write_exp_elt_opcode (UNOP_DYNAMIC_CAST);
643 write_exp_elt_type ($3);
644 write_exp_elt_opcode (UNOP_DYNAMIC_CAST); }
647 exp : CONST_CAST '<' type '>' '(' exp ')' %prec UNARY
648 { /* We could do more error checking here, but
649 it doesn't seem worthwhile. */
650 write_exp_elt_opcode (UNOP_CAST);
651 write_exp_elt_type ($3);
652 write_exp_elt_opcode (UNOP_CAST); }
658 /* We copy the string here, and not in the
659 lexer, to guarantee that we do not leak a
660 string. Note that we follow the
661 NUL-termination convention of the
663 struct typed_stoken *vec = XNEW (struct typed_stoken);
668 vec->length = $1.length;
669 vec->ptr = malloc ($1.length + 1);
670 memcpy (vec->ptr, $1.ptr, $1.length + 1);
675 /* Note that we NUL-terminate here, but just
679 $$.tokens = realloc ($$.tokens,
680 $$.len * sizeof (struct typed_stoken));
682 p = malloc ($2.length + 1);
683 memcpy (p, $2.ptr, $2.length + 1);
685 $$.tokens[$$.len - 1].type = $2.type;
686 $$.tokens[$$.len - 1].length = $2.length;
687 $$.tokens[$$.len - 1].ptr = p;
694 enum c_string_type type = C_STRING;
696 for (i = 0; i < $1.len; ++i)
698 switch ($1.tokens[i].type)
706 && type != $1.tokens[i].type)
707 error (_("Undefined string concatenation."));
708 type = $1.tokens[i].type;
712 internal_error (__FILE__, __LINE__,
713 "unrecognized type in string concatenation");
717 write_exp_string_vector (type, &$1);
718 for (i = 0; i < $1.len; ++i)
719 free ($1.tokens[i].ptr);
726 { write_exp_elt_opcode (OP_LONG);
727 write_exp_elt_type (parse_type->builtin_bool);
728 write_exp_elt_longcst ((LONGEST) 1);
729 write_exp_elt_opcode (OP_LONG); }
733 { write_exp_elt_opcode (OP_LONG);
734 write_exp_elt_type (parse_type->builtin_bool);
735 write_exp_elt_longcst ((LONGEST) 0);
736 write_exp_elt_opcode (OP_LONG); }
744 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
746 error (_("No file or function \"%s\"."),
747 copy_name ($1.stoken));
755 block : block COLONCOLON name
757 = lookup_symbol (copy_name ($3), $1,
758 VAR_DOMAIN, (int *) NULL);
759 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
760 error (_("No function \"%s\" in specified context."),
762 $$ = SYMBOL_BLOCK_VALUE (tem); }
765 variable: name_not_typename ENTRY
766 { struct symbol *sym = $1.sym;
768 if (sym == NULL || !SYMBOL_IS_ARGUMENT (sym)
769 || !symbol_read_needs_frame (sym))
770 error (_("@entry can be used only for function "
771 "parameters, not for \"%s\""),
772 copy_name ($1.stoken));
774 write_exp_elt_opcode (OP_VAR_ENTRY_VALUE);
775 write_exp_elt_sym (sym);
776 write_exp_elt_opcode (OP_VAR_ENTRY_VALUE);
780 variable: block COLONCOLON name
781 { struct symbol *sym;
782 sym = lookup_symbol (copy_name ($3), $1,
783 VAR_DOMAIN, (int *) NULL);
785 error (_("No symbol \"%s\" in specified context."),
787 if (symbol_read_needs_frame (sym))
789 if (innermost_block == 0
790 || contained_in (block_found,
792 innermost_block = block_found;
795 write_exp_elt_opcode (OP_VAR_VALUE);
796 /* block_found is set by lookup_symbol. */
797 write_exp_elt_block (block_found);
798 write_exp_elt_sym (sym);
799 write_exp_elt_opcode (OP_VAR_VALUE); }
802 qualified_name: TYPENAME COLONCOLON name
804 struct type *type = $1.type;
805 CHECK_TYPEDEF (type);
806 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
807 && TYPE_CODE (type) != TYPE_CODE_UNION
808 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
809 error (_("`%s' is not defined as an aggregate type."),
812 write_exp_elt_opcode (OP_SCOPE);
813 write_exp_elt_type (type);
814 write_exp_string ($3);
815 write_exp_elt_opcode (OP_SCOPE);
817 | TYPENAME COLONCOLON '~' name
819 struct type *type = $1.type;
820 struct stoken tmp_token;
821 CHECK_TYPEDEF (type);
822 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
823 && TYPE_CODE (type) != TYPE_CODE_UNION
824 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
825 error (_("`%s' is not defined as an aggregate type."),
828 tmp_token.ptr = (char*) alloca ($4.length + 2);
829 tmp_token.length = $4.length + 1;
830 tmp_token.ptr[0] = '~';
831 memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
832 tmp_token.ptr[tmp_token.length] = 0;
834 /* Check for valid destructor name. */
835 destructor_name_p (tmp_token.ptr, $1.type);
836 write_exp_elt_opcode (OP_SCOPE);
837 write_exp_elt_type (type);
838 write_exp_string (tmp_token);
839 write_exp_elt_opcode (OP_SCOPE);
841 | TYPENAME COLONCOLON name COLONCOLON name
843 char *copy = copy_name ($3);
844 error (_("No type \"%s\" within class "
845 "or namespace \"%s\"."),
846 copy, TYPE_NAME ($1.type));
850 variable: qualified_name
851 | COLONCOLON name_not_typename
853 char *name = copy_name ($2.stoken);
855 struct minimal_symbol *msymbol;
858 lookup_symbol (name, (const struct block *) NULL,
859 VAR_DOMAIN, (int *) NULL);
862 write_exp_elt_opcode (OP_VAR_VALUE);
863 write_exp_elt_block (NULL);
864 write_exp_elt_sym (sym);
865 write_exp_elt_opcode (OP_VAR_VALUE);
869 msymbol = lookup_minimal_symbol (name, NULL, NULL);
871 write_exp_msymbol (msymbol);
872 else if (!have_full_symbols () && !have_partial_symbols ())
873 error (_("No symbol table is loaded. Use the \"file\" command."));
875 error (_("No symbol \"%s\" in current context."), name);
879 variable: name_not_typename
880 { struct symbol *sym = $1.sym;
884 if (symbol_read_needs_frame (sym))
886 if (innermost_block == 0
887 || contained_in (block_found,
889 innermost_block = block_found;
892 write_exp_elt_opcode (OP_VAR_VALUE);
893 /* We want to use the selected frame, not
894 another more inner frame which happens to
895 be in the same block. */
896 write_exp_elt_block (NULL);
897 write_exp_elt_sym (sym);
898 write_exp_elt_opcode (OP_VAR_VALUE);
900 else if ($1.is_a_field_of_this)
902 /* C++: it hangs off of `this'. Must
903 not inadvertently convert from a method call
905 if (innermost_block == 0
906 || contained_in (block_found,
908 innermost_block = block_found;
909 write_exp_elt_opcode (OP_THIS);
910 write_exp_elt_opcode (OP_THIS);
911 write_exp_elt_opcode (STRUCTOP_PTR);
912 write_exp_string ($1.stoken);
913 write_exp_elt_opcode (STRUCTOP_PTR);
917 struct minimal_symbol *msymbol;
918 char *arg = copy_name ($1.stoken);
921 lookup_minimal_symbol (arg, NULL, NULL);
923 write_exp_msymbol (msymbol);
924 else if (!have_full_symbols () && !have_partial_symbols ())
925 error (_("No symbol table is loaded. Use the \"file\" command."));
927 error (_("No symbol \"%s\" in current context."),
928 copy_name ($1.stoken));
933 space_identifier : '@' NAME
934 { push_type_address_space (copy_name ($2.stoken));
935 push_type (tp_space_identifier);
939 const_or_volatile: const_or_volatile_noopt
943 cv_with_space_id : const_or_volatile space_identifier const_or_volatile
946 const_or_volatile_or_space_identifier_noopt: cv_with_space_id
947 | const_or_volatile_noopt
950 const_or_volatile_or_space_identifier:
951 const_or_volatile_or_space_identifier_noopt
956 { push_type (tp_pointer); $$ = 0; }
958 { push_type (tp_pointer); $$ = $2; }
960 { push_type (tp_reference); $$ = 0; }
962 { push_type (tp_reference); $$ = $2; }
966 direct_abs_decl: '(' abs_decl ')'
968 | direct_abs_decl array_mod
971 push_type (tp_array);
976 push_type (tp_array);
980 | direct_abs_decl func_mod
981 { push_type (tp_function); }
983 { push_type (tp_function); }
994 | '(' nonempty_typelist ')'
995 { free ($2); $$ = 0; }
998 /* We used to try to recognize pointer to member types here, but
999 that didn't work (shift/reduce conflicts meant that these rules never
1000 got executed). The problem is that
1001 int (foo::bar::baz::bizzle)
1002 is a function type but
1003 int (foo::bar::baz::bizzle::*)
1004 is a pointer to member type. Stroustrup loses again! */
1009 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
1013 { $$ = lookup_signed_typename (parse_language,
1017 { $$ = lookup_signed_typename (parse_language,
1021 { $$ = lookup_signed_typename (parse_language,
1025 { $$ = lookup_signed_typename (parse_language,
1028 | LONG SIGNED_KEYWORD INT_KEYWORD
1029 { $$ = lookup_signed_typename (parse_language,
1032 | LONG SIGNED_KEYWORD
1033 { $$ = lookup_signed_typename (parse_language,
1036 | SIGNED_KEYWORD LONG INT_KEYWORD
1037 { $$ = lookup_signed_typename (parse_language,
1040 | UNSIGNED LONG INT_KEYWORD
1041 { $$ = lookup_unsigned_typename (parse_language,
1044 | LONG UNSIGNED INT_KEYWORD
1045 { $$ = lookup_unsigned_typename (parse_language,
1049 { $$ = lookup_unsigned_typename (parse_language,
1053 { $$ = lookup_signed_typename (parse_language,
1056 | LONG LONG INT_KEYWORD
1057 { $$ = lookup_signed_typename (parse_language,
1060 | LONG LONG SIGNED_KEYWORD INT_KEYWORD
1061 { $$ = lookup_signed_typename (parse_language,
1064 | LONG LONG SIGNED_KEYWORD
1065 { $$ = lookup_signed_typename (parse_language,
1068 | SIGNED_KEYWORD LONG LONG
1069 { $$ = lookup_signed_typename (parse_language,
1072 | SIGNED_KEYWORD LONG LONG INT_KEYWORD
1073 { $$ = lookup_signed_typename (parse_language,
1076 | UNSIGNED LONG LONG
1077 { $$ = lookup_unsigned_typename (parse_language,
1080 | UNSIGNED LONG LONG INT_KEYWORD
1081 { $$ = lookup_unsigned_typename (parse_language,
1084 | LONG LONG UNSIGNED
1085 { $$ = lookup_unsigned_typename (parse_language,
1088 | LONG LONG UNSIGNED INT_KEYWORD
1089 { $$ = lookup_unsigned_typename (parse_language,
1093 { $$ = lookup_signed_typename (parse_language,
1096 | SHORT SIGNED_KEYWORD INT_KEYWORD
1097 { $$ = lookup_signed_typename (parse_language,
1100 | SHORT SIGNED_KEYWORD
1101 { $$ = lookup_signed_typename (parse_language,
1104 | UNSIGNED SHORT INT_KEYWORD
1105 { $$ = lookup_unsigned_typename (parse_language,
1109 { $$ = lookup_unsigned_typename (parse_language,
1112 | SHORT UNSIGNED INT_KEYWORD
1113 { $$ = lookup_unsigned_typename (parse_language,
1117 { $$ = lookup_typename (parse_language, parse_gdbarch,
1118 "double", (struct block *) NULL,
1120 | LONG DOUBLE_KEYWORD
1121 { $$ = lookup_typename (parse_language, parse_gdbarch,
1123 (struct block *) NULL, 0); }
1125 { $$ = lookup_struct (copy_name ($2),
1126 expression_context_block); }
1128 { $$ = lookup_struct (copy_name ($2),
1129 expression_context_block); }
1131 { $$ = lookup_union (copy_name ($2),
1132 expression_context_block); }
1134 { $$ = lookup_enum (copy_name ($2),
1135 expression_context_block); }
1137 { $$ = lookup_unsigned_typename (parse_language,
1139 TYPE_NAME($2.type)); }
1141 { $$ = lookup_unsigned_typename (parse_language,
1144 | SIGNED_KEYWORD typename
1145 { $$ = lookup_signed_typename (parse_language,
1147 TYPE_NAME($2.type)); }
1149 { $$ = lookup_signed_typename (parse_language,
1152 /* It appears that this rule for templates is never
1153 reduced; template recognition happens by lookahead
1154 in the token processing code in yylex. */
1155 | TEMPLATE name '<' type '>'
1156 { $$ = lookup_template_type(copy_name($2), $4,
1157 expression_context_block);
1159 | const_or_volatile_or_space_identifier_noopt typebase
1160 { $$ = follow_types ($2); }
1161 | typebase const_or_volatile_or_space_identifier_noopt
1162 { $$ = follow_types ($1); }
1168 $$.stoken.ptr = "int";
1169 $$.stoken.length = 3;
1170 $$.type = lookup_signed_typename (parse_language,
1176 $$.stoken.ptr = "long";
1177 $$.stoken.length = 4;
1178 $$.type = lookup_signed_typename (parse_language,
1184 $$.stoken.ptr = "short";
1185 $$.stoken.length = 5;
1186 $$.type = lookup_signed_typename (parse_language,
1194 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
1195 $<ivec>$[0] = 1; /* Number of types in vector */
1198 | nonempty_typelist ',' type
1199 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
1200 $$ = (struct type **) realloc ((char *) $1, len);
1201 $$[$<ivec>$[0]] = $3;
1206 | ptype const_or_volatile_or_space_identifier abs_decl const_or_volatile_or_space_identifier
1207 { $$ = follow_types ($1); }
1210 const_and_volatile: CONST_KEYWORD VOLATILE_KEYWORD
1211 | VOLATILE_KEYWORD CONST_KEYWORD
1214 const_or_volatile_noopt: const_and_volatile
1215 { push_type (tp_const);
1216 push_type (tp_volatile);
1219 { push_type (tp_const); }
1221 { push_type (tp_volatile); }
1224 operator: OPERATOR NEW
1225 { $$ = operator_stoken (" new"); }
1227 { $$ = operator_stoken (" delete "); }
1228 | OPERATOR NEW '[' ']'
1229 { $$ = operator_stoken (" new[]"); }
1230 | OPERATOR DELETE '[' ']'
1231 { $$ = operator_stoken (" delete[] "); }
1233 { $$ = operator_stoken ("+"); }
1235 { $$ = operator_stoken ("-"); }
1237 { $$ = operator_stoken ("*"); }
1239 { $$ = operator_stoken ("/"); }
1241 { $$ = operator_stoken ("%"); }
1243 { $$ = operator_stoken ("^"); }
1245 { $$ = operator_stoken ("&"); }
1247 { $$ = operator_stoken ("|"); }
1249 { $$ = operator_stoken ("~"); }
1251 { $$ = operator_stoken ("!"); }
1253 { $$ = operator_stoken ("="); }
1255 { $$ = operator_stoken ("<"); }
1257 { $$ = operator_stoken (">"); }
1258 | OPERATOR ASSIGN_MODIFY
1259 { const char *op = "unknown";
1283 case BINOP_BITWISE_IOR:
1286 case BINOP_BITWISE_AND:
1289 case BINOP_BITWISE_XOR:
1296 $$ = operator_stoken (op);
1299 { $$ = operator_stoken ("<<"); }
1301 { $$ = operator_stoken (">>"); }
1303 { $$ = operator_stoken ("=="); }
1305 { $$ = operator_stoken ("!="); }
1307 { $$ = operator_stoken ("<="); }
1309 { $$ = operator_stoken (">="); }
1311 { $$ = operator_stoken ("&&"); }
1313 { $$ = operator_stoken ("||"); }
1314 | OPERATOR INCREMENT
1315 { $$ = operator_stoken ("++"); }
1316 | OPERATOR DECREMENT
1317 { $$ = operator_stoken ("--"); }
1319 { $$ = operator_stoken (","); }
1320 | OPERATOR ARROW_STAR
1321 { $$ = operator_stoken ("->*"); }
1323 { $$ = operator_stoken ("->"); }
1325 { $$ = operator_stoken ("()"); }
1327 { $$ = operator_stoken ("[]"); }
1331 struct ui_file *buf = mem_fileopen ();
1333 c_print_type ($2, NULL, buf, -1, 0);
1334 name = ui_file_xstrdup (buf, &length);
1335 ui_file_delete (buf);
1336 $$ = operator_stoken (name);
1343 name : NAME { $$ = $1.stoken; }
1344 | BLOCKNAME { $$ = $1.stoken; }
1345 | TYPENAME { $$ = $1.stoken; }
1346 | NAME_OR_INT { $$ = $1.stoken; }
1347 | UNKNOWN_CPP_NAME { $$ = $1.stoken; }
1348 | operator { $$ = $1; }
1351 name_not_typename : NAME
1353 /* These would be useful if name_not_typename was useful, but it is just
1354 a fake for "variable", so these cause reduce/reduce conflicts because
1355 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
1356 =exp) or just an exp. If name_not_typename was ever used in an lvalue
1357 context where only a name could occur, this might be useful.
1363 $$.sym = lookup_symbol ($1.ptr,
1364 expression_context_block,
1366 &$$.is_a_field_of_this);
1373 /* Returns a stoken of the operator name given by OP (which does not
1374 include the string "operator"). */
1375 static struct stoken
1376 operator_stoken (const char *op)
1378 static const char *operator_string = "operator";
1379 struct stoken st = { NULL, 0 };
1380 st.length = strlen (operator_string) + strlen (op);
1381 st.ptr = malloc (st.length + 1);
1382 strcpy (st.ptr, operator_string);
1383 strcat (st.ptr, op);
1385 /* The toplevel (c_parse) will free the memory allocated here. */
1386 make_cleanup (free, st.ptr);
1390 /* Take care of parsing a number (anything that starts with a digit).
1391 Set yylval and return the token type; update lexptr.
1392 LEN is the number of characters in it. */
1394 /*** Needs some error checking for the float case ***/
1397 parse_number (char *p, int len, int parsed_float, YYSTYPE *putithere)
1399 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
1400 here, and we do kind of silly things like cast to unsigned. */
1407 int base = input_radix;
1410 /* Number of "L" suffixes encountered. */
1413 /* We have found a "L" or "U" suffix. */
1414 int found_suffix = 0;
1417 struct type *signed_type;
1418 struct type *unsigned_type;
1425 /* If it ends at "df", "dd" or "dl", take it as type of decimal floating
1426 point. Return DECFLOAT. */
1428 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
1431 putithere->typed_val_decfloat.type
1432 = parse_type->builtin_decfloat;
1433 decimal_from_string (putithere->typed_val_decfloat.val, 4,
1434 gdbarch_byte_order (parse_gdbarch), p);
1439 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
1442 putithere->typed_val_decfloat.type
1443 = parse_type->builtin_decdouble;
1444 decimal_from_string (putithere->typed_val_decfloat.val, 8,
1445 gdbarch_byte_order (parse_gdbarch), p);
1450 if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
1453 putithere->typed_val_decfloat.type
1454 = parse_type->builtin_declong;
1455 decimal_from_string (putithere->typed_val_decfloat.val, 16,
1456 gdbarch_byte_order (parse_gdbarch), p);
1461 if (! parse_c_float (parse_gdbarch, p, len,
1462 &putithere->typed_val_float.dval,
1463 &putithere->typed_val_float.type))
1468 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1512 if (c >= 'A' && c <= 'Z')
1514 if (c != 'l' && c != 'u')
1516 if (c >= '0' && c <= '9')
1524 if (base > 10 && c >= 'a' && c <= 'f')
1528 n += i = c - 'a' + 10;
1541 return ERROR; /* Char not a digit */
1544 return ERROR; /* Invalid digit in this base */
1546 /* Portably test for overflow (only works for nonzero values, so make
1547 a second check for zero). FIXME: Can't we just make n and prevn
1548 unsigned and avoid this? */
1549 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1550 unsigned_p = 1; /* Try something unsigned */
1552 /* Portably test for unsigned overflow.
1553 FIXME: This check is wrong; for example it doesn't find overflow
1554 on 0x123456789 when LONGEST is 32 bits. */
1555 if (c != 'l' && c != 'u' && n != 0)
1557 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
1558 error (_("Numeric constant too large."));
1563 /* An integer constant is an int, a long, or a long long. An L
1564 suffix forces it to be long; an LL suffix forces it to be long
1565 long. If not forced to a larger size, it gets the first type of
1566 the above that it fits in. To figure out whether it fits, we
1567 shift it right and see whether anything remains. Note that we
1568 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1569 operation, because many compilers will warn about such a shift
1570 (which always produces a zero result). Sometimes gdbarch_int_bit
1571 or gdbarch_long_bit will be that big, sometimes not. To deal with
1572 the case where it is we just always shift the value more than
1573 once, with fewer bits each time. */
1575 un = (ULONGEST)n >> 2;
1577 && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
1579 high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
1581 /* A large decimal (not hex or octal) constant (between INT_MAX
1582 and UINT_MAX) is a long or unsigned long, according to ANSI,
1583 never an unsigned int, but this code treats it as unsigned
1584 int. This probably should be fixed. GCC gives a warning on
1587 unsigned_type = parse_type->builtin_unsigned_int;
1588 signed_type = parse_type->builtin_int;
1590 else if (long_p <= 1
1591 && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
1593 high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
1594 unsigned_type = parse_type->builtin_unsigned_long;
1595 signed_type = parse_type->builtin_long;
1600 if (sizeof (ULONGEST) * HOST_CHAR_BIT
1601 < gdbarch_long_long_bit (parse_gdbarch))
1602 /* A long long does not fit in a LONGEST. */
1603 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1605 shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
1606 high_bit = (ULONGEST) 1 << shift;
1607 unsigned_type = parse_type->builtin_unsigned_long_long;
1608 signed_type = parse_type->builtin_long_long;
1611 putithere->typed_val_int.val = n;
1613 /* If the high bit of the worked out type is set then this number
1614 has to be unsigned. */
1616 if (unsigned_p || (n & high_bit))
1618 putithere->typed_val_int.type = unsigned_type;
1622 putithere->typed_val_int.type = signed_type;
1628 /* Temporary obstack used for holding strings. */
1629 static struct obstack tempbuf;
1630 static int tempbuf_init;
1632 /* Parse a C escape sequence. The initial backslash of the sequence
1633 is at (*PTR)[-1]. *PTR will be updated to point to just after the
1634 last character of the sequence. If OUTPUT is not NULL, the
1635 translated form of the escape sequence will be written there. If
1636 OUTPUT is NULL, no output is written and the call will only affect
1637 *PTR. If an escape sequence is expressed in target bytes, then the
1638 entire sequence will simply be copied to OUTPUT. Return 1 if any
1639 character was emitted, 0 otherwise. */
1642 c_parse_escape (char **ptr, struct obstack *output)
1644 char *tokptr = *ptr;
1647 /* Some escape sequences undergo character set conversion. Those we
1651 /* Hex escapes do not undergo character set conversion, so keep
1652 the escape sequence for later. */
1655 obstack_grow_str (output, "\\x");
1657 if (!isxdigit (*tokptr))
1658 error (_("\\x escape without a following hex digit"));
1659 while (isxdigit (*tokptr))
1662 obstack_1grow (output, *tokptr);
1667 /* Octal escapes do not undergo character set conversion, so
1668 keep the escape sequence for later. */
1680 obstack_grow_str (output, "\\");
1682 i < 3 && isdigit (*tokptr) && *tokptr != '8' && *tokptr != '9';
1686 obstack_1grow (output, *tokptr);
1692 /* We handle UCNs later. We could handle them here, but that
1693 would mean a spurious error in the case where the UCN could
1694 be converted to the target charset but not the host
1700 int i, len = c == 'U' ? 8 : 4;
1703 obstack_1grow (output, '\\');
1704 obstack_1grow (output, *tokptr);
1707 if (!isxdigit (*tokptr))
1708 error (_("\\%c escape without a following hex digit"), c);
1709 for (i = 0; i < len && isxdigit (*tokptr); ++i)
1712 obstack_1grow (output, *tokptr);
1718 /* We must pass backslash through so that it does not
1719 cause quoting during the second expansion. */
1722 obstack_grow_str (output, "\\\\");
1726 /* Escapes which undergo conversion. */
1729 obstack_1grow (output, '\a');
1734 obstack_1grow (output, '\b');
1739 obstack_1grow (output, '\f');
1744 obstack_1grow (output, '\n');
1749 obstack_1grow (output, '\r');
1754 obstack_1grow (output, '\t');
1759 obstack_1grow (output, '\v');
1763 /* GCC extension. */
1766 obstack_1grow (output, HOST_ESCAPE_CHAR);
1770 /* Backslash-newline expands to nothing at all. */
1776 /* A few escapes just expand to the character itself. */
1780 /* GCC extensions. */
1785 /* Unrecognized escapes turn into the character itself. */
1788 obstack_1grow (output, *tokptr);
1796 /* Parse a string or character literal from TOKPTR. The string or
1797 character may be wide or unicode. *OUTPTR is set to just after the
1798 end of the literal in the input string. The resulting token is
1799 stored in VALUE. This returns a token value, either STRING or
1800 CHAR, depending on what was parsed. *HOST_CHARS is set to the
1801 number of host characters in the literal. */
1803 parse_string_or_char (char *tokptr, char **outptr, struct typed_stoken *value,
1807 enum c_string_type type;
1809 /* Build the gdb internal form of the input string in tempbuf. Note
1810 that the buffer is null byte terminated *only* for the
1811 convenience of debugging gdb itself and printing the buffer
1812 contents when the buffer contains no embedded nulls. Gdb does
1813 not depend upon the buffer being null byte terminated, it uses
1814 the length string instead. This allows gdb to handle C strings
1815 (as well as strings in other languages) with embedded null
1821 obstack_free (&tempbuf, NULL);
1822 obstack_init (&tempbuf);
1824 /* Record the string type. */
1827 type = C_WIDE_STRING;
1830 else if (*tokptr == 'u')
1835 else if (*tokptr == 'U')
1843 /* Skip the quote. */
1857 *host_chars += c_parse_escape (&tokptr, &tempbuf);
1859 else if (c == quote)
1863 obstack_1grow (&tempbuf, c);
1865 /* FIXME: this does the wrong thing with multi-byte host
1866 characters. We could use mbrlen here, but that would
1867 make "set host-charset" a bit less useful. */
1872 if (*tokptr != quote)
1875 error (_("Unterminated string in expression."));
1877 error (_("Unmatched single quote."));
1882 value->ptr = obstack_base (&tempbuf);
1883 value->length = obstack_object_size (&tempbuf);
1887 return quote == '"' ? STRING : CHAR;
1894 enum exp_opcode opcode;
1898 static const struct token tokentab3[] =
1900 {">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
1901 {"<<=", ASSIGN_MODIFY, BINOP_LSH, 0},
1902 {"->*", ARROW_STAR, BINOP_END, 1}
1905 static const struct token tokentab2[] =
1907 {"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
1908 {"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
1909 {"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
1910 {"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
1911 {"%=", ASSIGN_MODIFY, BINOP_REM, 0},
1912 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
1913 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
1914 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
1915 {"++", INCREMENT, BINOP_END, 0},
1916 {"--", DECREMENT, BINOP_END, 0},
1917 {"->", ARROW, BINOP_END, 0},
1918 {"&&", ANDAND, BINOP_END, 0},
1919 {"||", OROR, BINOP_END, 0},
1920 /* "::" is *not* only C++: gdb overrides its meaning in several
1921 different ways, e.g., 'filename'::func, function::variable. */
1922 {"::", COLONCOLON, BINOP_END, 0},
1923 {"<<", LSH, BINOP_END, 0},
1924 {">>", RSH, BINOP_END, 0},
1925 {"==", EQUAL, BINOP_END, 0},
1926 {"!=", NOTEQUAL, BINOP_END, 0},
1927 {"<=", LEQ, BINOP_END, 0},
1928 {">=", GEQ, BINOP_END, 0},
1929 {".*", DOT_STAR, BINOP_END, 1}
1932 /* Identifier-like tokens. */
1933 static const struct token ident_tokens[] =
1935 {"unsigned", UNSIGNED, OP_NULL, 0},
1936 {"template", TEMPLATE, OP_NULL, 1},
1937 {"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
1938 {"struct", STRUCT, OP_NULL, 0},
1939 {"signed", SIGNED_KEYWORD, OP_NULL, 0},
1940 {"sizeof", SIZEOF, OP_NULL, 0},
1941 {"double", DOUBLE_KEYWORD, OP_NULL, 0},
1942 {"false", FALSEKEYWORD, OP_NULL, 1},
1943 {"class", CLASS, OP_NULL, 1},
1944 {"union", UNION, OP_NULL, 0},
1945 {"short", SHORT, OP_NULL, 0},
1946 {"const", CONST_KEYWORD, OP_NULL, 0},
1947 {"enum", ENUM, OP_NULL, 0},
1948 {"long", LONG, OP_NULL, 0},
1949 {"true", TRUEKEYWORD, OP_NULL, 1},
1950 {"int", INT_KEYWORD, OP_NULL, 0},
1951 {"new", NEW, OP_NULL, 1},
1952 {"delete", DELETE, OP_NULL, 1},
1953 {"operator", OPERATOR, OP_NULL, 1},
1955 {"and", ANDAND, BINOP_END, 1},
1956 {"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, 1},
1957 {"bitand", '&', OP_NULL, 1},
1958 {"bitor", '|', OP_NULL, 1},
1959 {"compl", '~', OP_NULL, 1},
1960 {"not", '!', OP_NULL, 1},
1961 {"not_eq", NOTEQUAL, BINOP_END, 1},
1962 {"or", OROR, BINOP_END, 1},
1963 {"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 1},
1964 {"xor", '^', OP_NULL, 1},
1965 {"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 1},
1967 {"const_cast", CONST_CAST, OP_NULL, 1 },
1968 {"dynamic_cast", DYNAMIC_CAST, OP_NULL, 1 },
1969 {"static_cast", STATIC_CAST, OP_NULL, 1 },
1970 {"reinterpret_cast", REINTERPRET_CAST, OP_NULL, 1 }
1973 /* When we find that lexptr (the global var defined in parse.c) is
1974 pointing at a macro invocation, we expand the invocation, and call
1975 scan_macro_expansion to save the old lexptr here and point lexptr
1976 into the expanded text. When we reach the end of that, we call
1977 end_macro_expansion to pop back to the value we saved here. The
1978 macro expansion code promises to return only fully-expanded text,
1979 so we don't need to "push" more than one level.
1981 This is disgusting, of course. It would be cleaner to do all macro
1982 expansion beforehand, and then hand that to lexptr. But we don't
1983 really know where the expression ends. Remember, in a command like
1985 (gdb) break *ADDRESS if CONDITION
1987 we evaluate ADDRESS in the scope of the current frame, but we
1988 evaluate CONDITION in the scope of the breakpoint's location. So
1989 it's simply wrong to try to macro-expand the whole thing at once. */
1990 static char *macro_original_text;
1992 /* We save all intermediate macro expansions on this obstack for the
1993 duration of a single parse. The expansion text may sometimes have
1994 to live past the end of the expansion, due to yacc lookahead.
1995 Rather than try to be clever about saving the data for a single
1996 token, we simply keep it all and delete it after parsing has
1998 static struct obstack expansion_obstack;
2001 scan_macro_expansion (char *expansion)
2005 /* We'd better not be trying to push the stack twice. */
2006 gdb_assert (! macro_original_text);
2008 /* Copy to the obstack, and then free the intermediate
2010 copy = obstack_copy0 (&expansion_obstack, expansion, strlen (expansion));
2013 /* Save the old lexptr value, so we can return to it when we're done
2014 parsing the expanded text. */
2015 macro_original_text = lexptr;
2021 scanning_macro_expansion (void)
2023 return macro_original_text != 0;
2028 finished_macro_expansion (void)
2030 /* There'd better be something to pop back to. */
2031 gdb_assert (macro_original_text);
2033 /* Pop back to the original text. */
2034 lexptr = macro_original_text;
2035 macro_original_text = 0;
2040 scan_macro_cleanup (void *dummy)
2042 if (macro_original_text)
2043 finished_macro_expansion ();
2045 obstack_free (&expansion_obstack, NULL);
2048 /* Return true iff the token represents a C++ cast operator. */
2051 is_cast_operator (const char *token, int len)
2053 return (! strncmp (token, "dynamic_cast", len)
2054 || ! strncmp (token, "static_cast", len)
2055 || ! strncmp (token, "reinterpret_cast", len)
2056 || ! strncmp (token, "const_cast", len));
2059 /* The scope used for macro expansion. */
2060 static struct macro_scope *expression_macro_scope;
2062 /* This is set if a NAME token appeared at the very end of the input
2063 string, with no whitespace separating the name from the EOF. This
2064 is used only when parsing to do field name completion. */
2065 static int saw_name_at_eof;
2067 /* This is set if the previously-returned token was a structure
2068 operator -- either '.' or ARROW. This is used only when parsing to
2069 do field name completion. */
2070 static int last_was_structop;
2072 /* Read one token, getting characters through lexptr. */
2075 lex_one_token (void)
2081 int saw_structop = last_was_structop;
2084 last_was_structop = 0;
2088 /* Check if this is a macro invocation that we need to expand. */
2089 if (! scanning_macro_expansion ())
2091 char *expanded = macro_expand_next (&lexptr,
2092 standard_macro_lookup,
2093 expression_macro_scope);
2096 scan_macro_expansion (expanded);
2099 prev_lexptr = lexptr;
2102 /* See if it is a special token of length 3. */
2103 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
2104 if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
2106 if (tokentab3[i].cxx_only
2107 && parse_language->la_language != language_cplus)
2111 yylval.opcode = tokentab3[i].opcode;
2112 return tokentab3[i].token;
2115 /* See if it is a special token of length 2. */
2116 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
2117 if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
2119 if (tokentab2[i].cxx_only
2120 && parse_language->la_language != language_cplus)
2124 yylval.opcode = tokentab2[i].opcode;
2125 if (in_parse_field && tokentab2[i].token == ARROW)
2126 last_was_structop = 1;
2127 return tokentab2[i].token;
2130 switch (c = *tokstart)
2133 /* If we were just scanning the result of a macro expansion,
2134 then we need to resume scanning the original text.
2135 If we're parsing for field name completion, and the previous
2136 token allows such completion, return a COMPLETE token.
2137 Otherwise, we were already scanning the original text, and
2138 we're really done. */
2139 if (scanning_macro_expansion ())
2141 finished_macro_expansion ();
2144 else if (saw_name_at_eof)
2146 saw_name_at_eof = 0;
2149 else if (saw_structop)
2168 if (paren_depth == 0)
2175 if (comma_terminates
2177 && ! scanning_macro_expansion ())
2183 /* Might be a floating point number. */
2184 if (lexptr[1] < '0' || lexptr[1] > '9')
2187 last_was_structop = 1;
2188 goto symbol; /* Nope, must be a symbol. */
2190 /* FALL THRU into number case. */
2203 /* It's a number. */
2204 int got_dot = 0, got_e = 0, toktype;
2206 int hex = input_radix > 10;
2208 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
2213 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
2221 /* This test includes !hex because 'e' is a valid hex digit
2222 and thus does not indicate a floating point number when
2223 the radix is hex. */
2224 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
2225 got_dot = got_e = 1;
2226 /* This test does not include !hex, because a '.' always indicates
2227 a decimal floating point number regardless of the radix. */
2228 else if (!got_dot && *p == '.')
2230 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
2231 && (*p == '-' || *p == '+'))
2232 /* This is the sign of the exponent, not the end of the
2235 /* We will take any letters or digits. parse_number will
2236 complain if past the radix, or if L or U are not final. */
2237 else if ((*p < '0' || *p > '9')
2238 && ((*p < 'a' || *p > 'z')
2239 && (*p < 'A' || *p > 'Z')))
2242 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
2243 if (toktype == ERROR)
2245 char *err_copy = (char *) alloca (p - tokstart + 1);
2247 memcpy (err_copy, tokstart, p - tokstart);
2248 err_copy[p - tokstart] = 0;
2249 error (_("Invalid number \"%s\"."), err_copy);
2257 char *p = &tokstart[1];
2258 size_t len = strlen ("entry");
2260 while (isspace (*p))
2262 if (strncmp (p, "entry", len) == 0 && !isalnum (p[len])
2294 if (tokstart[1] != '"' && tokstart[1] != '\'')
2301 int result = parse_string_or_char (tokstart, &lexptr, &yylval.tsval,
2306 error (_("Empty character constant."));
2307 else if (host_len > 2 && c == '\'')
2310 namelen = lexptr - tokstart - 1;
2313 else if (host_len > 1)
2314 error (_("Invalid character constant."));
2320 if (!(c == '_' || c == '$'
2321 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
2322 /* We must have come across a bad character (e.g. ';'). */
2323 error (_("Invalid character '%c' in expression."), c);
2325 /* It's a name. See how long it is. */
2327 for (c = tokstart[namelen];
2328 (c == '_' || c == '$' || (c >= '0' && c <= '9')
2329 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
2331 /* Template parameter lists are part of the name.
2332 FIXME: This mishandles `print $a<4&&$a>3'. */
2336 if (! is_cast_operator (tokstart, namelen))
2338 /* Scan ahead to get rest of the template specification. Note
2339 that we look ahead only when the '<' adjoins non-whitespace
2340 characters; for comparison expressions, e.g. "a < b > c",
2341 there must be spaces before the '<', etc. */
2343 char * p = find_template_name_end (tokstart + namelen);
2345 namelen = p - tokstart;
2349 c = tokstart[++namelen];
2352 /* The token "if" terminates the expression and is NOT removed from
2353 the input stream. It doesn't count if it appears in the
2354 expansion of a macro. */
2356 && tokstart[0] == 'i'
2357 && tokstart[1] == 'f'
2358 && ! scanning_macro_expansion ())
2363 /* For the same reason (breakpoint conditions), "thread N"
2364 terminates the expression. "thread" could be an identifier, but
2365 an identifier is never followed by a number without intervening
2366 punctuation. "task" is similar. Handle abbreviations of these,
2367 similarly to breakpoint.c:find_condition_and_thread. */
2369 && (strncmp (tokstart, "thread", namelen) == 0
2370 || strncmp (tokstart, "task", namelen) == 0)
2371 && (tokstart[namelen] == ' ' || tokstart[namelen] == '\t')
2372 && ! scanning_macro_expansion ())
2374 char *p = tokstart + namelen + 1;
2375 while (*p == ' ' || *p == '\t')
2377 if (*p >= '0' && *p <= '9')
2385 yylval.sval.ptr = tokstart;
2386 yylval.sval.length = namelen;
2388 /* Catch specific keywords. */
2389 copy = copy_name (yylval.sval);
2390 for (i = 0; i < sizeof ident_tokens / sizeof ident_tokens[0]; i++)
2391 if (strcmp (copy, ident_tokens[i].operator) == 0)
2393 if (ident_tokens[i].cxx_only
2394 && parse_language->la_language != language_cplus)
2397 /* It is ok to always set this, even though we don't always
2398 strictly need to. */
2399 yylval.opcode = ident_tokens[i].opcode;
2400 return ident_tokens[i].token;
2403 if (*tokstart == '$')
2406 if (in_parse_field && *lexptr == '\0')
2407 saw_name_at_eof = 1;
2411 /* An object of this type is pushed on a FIFO by the "outer" lexer. */
2418 DEF_VEC_O (token_and_value);
2420 /* A FIFO of tokens that have been read but not yet returned to the
2422 static VEC (token_and_value) *token_fifo;
2424 /* Non-zero if the lexer should return tokens from the FIFO. */
2427 /* Temporary storage for c_lex; this holds symbol names as they are
2429 static struct obstack name_obstack;
2431 /* Classify a NAME token. The contents of the token are in `yylval'.
2432 Updates yylval and returns the new token type. BLOCK is the block
2433 in which lookups start; this can be NULL to mean the global
2436 classify_name (struct block *block)
2440 int is_a_field_of_this = 0;
2442 copy = copy_name (yylval.sval);
2444 sym = lookup_symbol (copy, block, VAR_DOMAIN,
2445 parse_language->la_language == language_cplus
2446 ? &is_a_field_of_this : (int *) NULL);
2448 if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
2450 yylval.ssym.sym = sym;
2451 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2456 /* See if it's a file name. */
2457 struct symtab *symtab;
2459 symtab = lookup_symtab (copy);
2462 yylval.bval = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), STATIC_BLOCK);
2467 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
2469 yylval.tsym.type = SYMBOL_TYPE (sym);
2474 = language_lookup_primitive_type_by_name (parse_language,
2475 parse_gdbarch, copy);
2476 if (yylval.tsym.type != NULL)
2479 /* Input names that aren't symbols but ARE valid hex numbers, when
2480 the input radix permits them, can be names or numbers depending
2481 on the parse. Note we support radixes > 16 here. */
2483 && ((copy[0] >= 'a' && copy[0] < 'a' + input_radix - 10)
2484 || (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10)))
2486 YYSTYPE newlval; /* Its value is ignored. */
2487 int hextype = parse_number (copy, yylval.sval.length, 0, &newlval);
2490 yylval.ssym.sym = sym;
2491 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2496 /* Any other kind of symbol */
2497 yylval.ssym.sym = sym;
2498 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
2501 && parse_language->la_language == language_cplus
2502 && !is_a_field_of_this
2503 && !lookup_minimal_symbol (copy, NULL, NULL))
2504 return UNKNOWN_CPP_NAME;
2509 /* Like classify_name, but used by the inner loop of the lexer, when a
2510 name might have already been seen. FIRST_NAME is true if the token
2511 in `yylval' is the first component of a name, false otherwise. If
2512 this function returns NAME, it might not have updated `yylval'.
2513 This is ok because the caller only cares about TYPENAME. */
2515 classify_inner_name (struct block *block, int first_name)
2517 struct type *type, *new_type;
2521 return classify_name (block);
2523 type = check_typedef (yylval.tsym.type);
2524 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
2525 && TYPE_CODE (type) != TYPE_CODE_UNION
2526 && TYPE_CODE (type) != TYPE_CODE_NAMESPACE)
2527 /* We know the caller won't expect us to update yylval. */
2530 copy = copy_name (yylval.tsym.stoken);
2531 new_type = cp_lookup_nested_type (yylval.tsym.type, copy, block);
2533 if (new_type == NULL)
2534 /* We know the caller won't expect us to update yylval. */
2537 yylval.tsym.type = new_type;
2541 /* The outer level of a two-level lexer. This calls the inner lexer
2542 to return tokens. It then either returns these tokens, or
2543 aggregates them into a larger token. This lets us work around a
2544 problem in our parsing approach, where the parser could not
2545 distinguish between qualified names and qualified types at the
2548 This approach is still not ideal, because it mishandles template
2549 types. See the comment in lex_one_token for an example. However,
2550 this is still an improvement over the earlier approach, and will
2551 suffice until we move to better parsing technology. */
2555 token_and_value current;
2556 int first_was_coloncolon, last_was_coloncolon, first_iter;
2558 if (popping && !VEC_empty (token_and_value, token_fifo))
2560 token_and_value tv = *VEC_index (token_and_value, token_fifo, 0);
2561 VEC_ordered_remove (token_and_value, token_fifo, 0);
2567 current.token = lex_one_token ();
2568 if (current.token == NAME)
2569 current.token = classify_name (expression_context_block);
2570 if (parse_language->la_language != language_cplus
2571 || (current.token != TYPENAME && current.token != COLONCOLON))
2572 return current.token;
2574 first_was_coloncolon = current.token == COLONCOLON;
2575 last_was_coloncolon = first_was_coloncolon;
2576 obstack_free (&name_obstack, obstack_base (&name_obstack));
2577 if (!last_was_coloncolon)
2578 obstack_grow (&name_obstack, yylval.sval.ptr, yylval.sval.length);
2579 current.value = yylval;
2583 token_and_value next;
2585 next.token = lex_one_token ();
2586 next.value = yylval;
2588 if (next.token == NAME && last_was_coloncolon)
2592 classification = classify_inner_name (first_was_coloncolon
2594 : expression_context_block,
2596 /* We keep going until we either run out of names, or until
2597 we have a qualified name which is not a type. */
2598 if (classification != TYPENAME)
2600 /* Push the final component and leave the loop. */
2601 VEC_safe_push (token_and_value, token_fifo, &next);
2605 /* Update the partial name we are constructing. */
2608 /* We don't want to put a leading "::" into the name. */
2609 obstack_grow_str (&name_obstack, "::");
2611 obstack_grow (&name_obstack, next.value.sval.ptr,
2612 next.value.sval.length);
2614 yylval.sval.ptr = obstack_base (&name_obstack);
2615 yylval.sval.length = obstack_object_size (&name_obstack);
2616 current.value = yylval;
2617 current.token = classification;
2619 last_was_coloncolon = 0;
2621 else if (next.token == COLONCOLON && !last_was_coloncolon)
2622 last_was_coloncolon = 1;
2625 /* We've reached the end of the name. */
2626 VEC_safe_push (token_and_value, token_fifo, &next);
2635 /* If we ended with a "::", insert it too. */
2636 if (last_was_coloncolon)
2639 memset (&cc, 0, sizeof (token_and_value));
2640 if (first_was_coloncolon && first_iter)
2645 cc.token = COLONCOLON;
2646 VEC_safe_insert (token_and_value, token_fifo, 0, &cc);
2649 yylval = current.value;
2650 yylval.sval.ptr = obstack_copy0 (&expansion_obstack,
2652 yylval.sval.length);
2653 return current.token;
2660 struct cleanup *back_to = make_cleanup (free_current_contents,
2661 &expression_macro_scope);
2663 /* Set up the scope for macro expansion. */
2664 expression_macro_scope = NULL;
2666 if (expression_context_block)
2667 expression_macro_scope
2668 = sal_macro_scope (find_pc_line (expression_context_pc, 0));
2670 expression_macro_scope = default_macro_scope ();
2671 if (! expression_macro_scope)
2672 expression_macro_scope = user_macro_scope ();
2674 /* Initialize macro expansion code. */
2675 obstack_init (&expansion_obstack);
2676 gdb_assert (! macro_original_text);
2677 make_cleanup (scan_macro_cleanup, 0);
2679 make_cleanup_restore_integer (&yydebug);
2680 yydebug = parser_debug;
2682 /* Initialize some state used by the lexer. */
2683 last_was_structop = 0;
2684 saw_name_at_eof = 0;
2686 VEC_free (token_and_value, token_fifo);
2688 obstack_init (&name_obstack);
2689 make_cleanup_obstack_free (&name_obstack);
2691 result = yyparse ();
2692 do_cleanups (back_to);
2701 lexptr = prev_lexptr;
2703 error (_("A %s in expression, near `%s'."), (msg ? msg : "error"), lexptr);