1 /* YACC parser for C expressions, for GDB.
2 Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 /* Parse a C expression from text in a string,
23 and return the result as a struct expression pointer.
24 That structure contains arithmetic operations in reverse polish,
25 with constants represented by operations that are followed by special data.
26 See expression.h for the details of the format.
27 What is important here is that it can be built up sequentially
28 during the process of parsing; the lower levels of the tree always
29 come first in the result.
31 Note that malloc's and realloc's in this file are transformed to
32 xmalloc and xrealloc respectively by the same sed command in the
33 makefile that remaps any other malloc/realloc inserted by the parser
34 generator. Doing this with #defines and trying to control the interaction
35 with include files (<malloc.h> and <stdlib.h> for example) just became
36 too messy, particularly when such includes can be inserted at random
37 times by the parser generator. */
42 #include "gdb_string.h"
44 #include "expression.h"
46 #include "parser-defs.h"
49 #include "bfd.h" /* Required by objfiles.h. */
50 #include "symfile.h" /* Required by objfiles.h. */
51 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
53 /* Flag indicating we're dealing with HP-compiled objects */
54 extern int hp_som_som_object_present;
56 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
57 as well as gratuitiously global symbol names, so we can have multiple
58 yacc generated parsers in gdb. Note that these are only the variables
59 produced by yacc. If other parser generators (bison, byacc, etc) produce
60 additional global names that conflict at link time, then those parser
61 generators need to be fixed instead of adding those names to this list. */
63 #define yymaxdepth c_maxdepth
64 #define yyparse c_parse
66 #define yyerror c_error
69 #define yydebug c_debug
78 #define yyerrflag c_errflag
79 #define yynerrs c_nerrs
84 #define yystate c_state
90 #define yyreds c_reds /* With YYDEBUG defined */
91 #define yytoks c_toks /* With YYDEBUG defined */
94 #define yydefred c_yydefred
95 #define yydgoto c_yydgoto
96 #define yysindex c_yysindex
97 #define yyrindex c_yyrindex
98 #define yygindex c_yygindex
99 #define yytable c_yytable
100 #define yycheck c_yycheck
103 #define YYDEBUG 0 /* Default to no yydebug support */
108 static int yylex (void);
110 void yyerror (char *);
114 /* Although the yacc "value" of an expression is not used,
115 since the result is stored in the structure being created,
116 other node types do have values. */
133 struct symtoken ssym;
136 enum exp_opcode opcode;
137 struct internalvar *ivar;
144 /* YYSTYPE gets defined by %union */
145 static int parse_number (char *, int, int, YYSTYPE *);
148 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
150 %type <tval> type typebase
151 %type <tvec> nonempty_typelist
152 /* %type <bval> block */
154 /* Fancy type parsing. */
155 %type <voidval> func_mod direct_abs_decl abs_decl
157 %type <lval> array_mod
159 %token <typed_val_int> INT
160 %token <typed_val_float> FLOAT
162 /* Both NAME and TYPENAME tokens represent symbols in the input,
163 and both convey their data as strings.
164 But a TYPENAME is a string that happens to be defined as a typedef
165 or builtin type name (such as int or char)
166 and a NAME is any other symbol.
167 Contexts where this distinction is not important can use the
168 nonterminal "name", which matches either NAME or TYPENAME. */
171 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
172 %token <tsym> TYPENAME
174 %type <ssym> name_not_typename
175 %type <tsym> typename
177 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
178 but which would parse as a valid number in the current input radix.
179 E.g. "c" when input_radix==16. Depending on the parse, it will be
180 turned into a name or into a number. */
182 %token <ssym> NAME_OR_INT
184 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
188 /* Special type cases, put in to allow the parser to distinguish different
190 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
192 %token <voidval> VARIABLE
194 %token <opcode> ASSIGN_MODIFY
204 %right '=' ASSIGN_MODIFY
212 %left '<' '>' LEQ GEQ
217 %right UNARY INCREMENT DECREMENT
218 %right ARROW '.' '[' '('
219 %token <ssym> BLOCKNAME
220 %token <bval> FILENAME
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); }
247 exp : '&' exp %prec UNARY
248 { write_exp_elt_opcode (UNOP_ADDR); }
250 exp : '-' exp %prec UNARY
251 { write_exp_elt_opcode (UNOP_NEG); }
254 exp : '!' exp %prec UNARY
255 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
258 exp : '~' exp %prec UNARY
259 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
262 exp : INCREMENT exp %prec UNARY
263 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
266 exp : DECREMENT exp %prec UNARY
267 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
270 exp : exp INCREMENT %prec UNARY
271 { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
274 exp : exp DECREMENT %prec UNARY
275 { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
278 exp : SIZEOF exp %prec UNARY
279 { write_exp_elt_opcode (UNOP_SIZEOF); }
283 { write_exp_elt_opcode (STRUCTOP_PTR);
284 write_exp_string ($3);
285 write_exp_elt_opcode (STRUCTOP_PTR); }
288 exp : exp ARROW qualified_name
289 { /* exp->type::name becomes exp->*(&type::name) */
290 /* Note: this doesn't work if name is a
291 static member! FIXME */
292 write_exp_elt_opcode (UNOP_ADDR);
293 write_exp_elt_opcode (STRUCTOP_MPTR); }
296 exp : exp ARROW '*' exp
297 { write_exp_elt_opcode (STRUCTOP_MPTR); }
301 { write_exp_elt_opcode (STRUCTOP_STRUCT);
302 write_exp_string ($3);
303 write_exp_elt_opcode (STRUCTOP_STRUCT); }
306 exp : exp '.' qualified_name
307 { /* exp.type::name becomes exp.*(&type::name) */
308 /* Note: this doesn't work if name is a
309 static member! FIXME */
310 write_exp_elt_opcode (UNOP_ADDR);
311 write_exp_elt_opcode (STRUCTOP_MEMBER); }
314 exp : exp '.' '*' exp
315 { write_exp_elt_opcode (STRUCTOP_MEMBER); }
318 exp : exp '[' exp1 ']'
319 { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
323 /* This is to save the value of arglist_len
324 being accumulated by an outer function call. */
325 { start_arglist (); }
326 arglist ')' %prec ARROW
327 { write_exp_elt_opcode (OP_FUNCALL);
328 write_exp_elt_longcst ((LONGEST) end_arglist ());
329 write_exp_elt_opcode (OP_FUNCALL); }
333 { start_arglist (); }
343 arglist : arglist ',' exp %prec ABOVE_COMMA
348 { $$ = end_arglist () - 1; }
350 exp : lcurly arglist rcurly %prec ARROW
351 { write_exp_elt_opcode (OP_ARRAY);
352 write_exp_elt_longcst ((LONGEST) 0);
353 write_exp_elt_longcst ((LONGEST) $3);
354 write_exp_elt_opcode (OP_ARRAY); }
357 exp : lcurly type rcurly exp %prec UNARY
358 { write_exp_elt_opcode (UNOP_MEMVAL);
359 write_exp_elt_type ($2);
360 write_exp_elt_opcode (UNOP_MEMVAL); }
363 exp : '(' type ')' exp %prec UNARY
364 { write_exp_elt_opcode (UNOP_CAST);
365 write_exp_elt_type ($2);
366 write_exp_elt_opcode (UNOP_CAST); }
373 /* Binary operators in order of decreasing precedence. */
376 { write_exp_elt_opcode (BINOP_REPEAT); }
380 { write_exp_elt_opcode (BINOP_MUL); }
384 { write_exp_elt_opcode (BINOP_DIV); }
388 { write_exp_elt_opcode (BINOP_REM); }
392 { write_exp_elt_opcode (BINOP_ADD); }
396 { write_exp_elt_opcode (BINOP_SUB); }
400 { write_exp_elt_opcode (BINOP_LSH); }
404 { write_exp_elt_opcode (BINOP_RSH); }
408 { write_exp_elt_opcode (BINOP_EQUAL); }
411 exp : exp NOTEQUAL exp
412 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
416 { write_exp_elt_opcode (BINOP_LEQ); }
420 { write_exp_elt_opcode (BINOP_GEQ); }
424 { write_exp_elt_opcode (BINOP_LESS); }
428 { write_exp_elt_opcode (BINOP_GTR); }
432 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
436 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
440 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
444 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
448 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
451 exp : exp '?' exp ':' exp %prec '?'
452 { write_exp_elt_opcode (TERNOP_COND); }
456 { write_exp_elt_opcode (BINOP_ASSIGN); }
459 exp : exp ASSIGN_MODIFY exp
460 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
461 write_exp_elt_opcode ($2);
462 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
466 { write_exp_elt_opcode (OP_LONG);
467 write_exp_elt_type ($1.type);
468 write_exp_elt_longcst ((LONGEST)($1.val));
469 write_exp_elt_opcode (OP_LONG); }
474 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
475 write_exp_elt_opcode (OP_LONG);
476 write_exp_elt_type (val.typed_val_int.type);
477 write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
478 write_exp_elt_opcode (OP_LONG);
484 { write_exp_elt_opcode (OP_DOUBLE);
485 write_exp_elt_type ($1.type);
486 write_exp_elt_dblcst ($1.dval);
487 write_exp_elt_opcode (OP_DOUBLE); }
494 /* Already written by write_dollar_variable. */
497 exp : SIZEOF '(' type ')' %prec UNARY
498 { write_exp_elt_opcode (OP_LONG);
499 write_exp_elt_type (builtin_type_int);
501 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
502 write_exp_elt_opcode (OP_LONG); }
506 { /* C strings are converted into array constants with
507 an explicit null byte added at the end. Thus
508 the array upper bound is the string length.
509 There is no such thing in C as a completely empty
511 char *sp = $1.ptr; int count = $1.length;
514 write_exp_elt_opcode (OP_LONG);
515 write_exp_elt_type (builtin_type_char);
516 write_exp_elt_longcst ((LONGEST)(*sp++));
517 write_exp_elt_opcode (OP_LONG);
519 write_exp_elt_opcode (OP_LONG);
520 write_exp_elt_type (builtin_type_char);
521 write_exp_elt_longcst ((LONGEST)'\0');
522 write_exp_elt_opcode (OP_LONG);
523 write_exp_elt_opcode (OP_ARRAY);
524 write_exp_elt_longcst ((LONGEST) 0);
525 write_exp_elt_longcst ((LONGEST) ($1.length));
526 write_exp_elt_opcode (OP_ARRAY); }
531 { write_exp_elt_opcode (OP_THIS);
532 write_exp_elt_opcode (OP_THIS); }
536 { write_exp_elt_opcode (OP_LONG);
537 write_exp_elt_type (builtin_type_bool);
538 write_exp_elt_longcst ((LONGEST) 1);
539 write_exp_elt_opcode (OP_LONG); }
543 { write_exp_elt_opcode (OP_LONG);
544 write_exp_elt_type (builtin_type_bool);
545 write_exp_elt_longcst ((LONGEST) 0);
546 write_exp_elt_opcode (OP_LONG); }
554 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
556 error ("No file or function \"%s\".",
557 copy_name ($1.stoken));
565 block : block COLONCOLON name
567 = lookup_symbol (copy_name ($3), $1,
568 VAR_NAMESPACE, (int *) NULL,
569 (struct symtab **) NULL);
570 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
571 error ("No function \"%s\" in specified context.",
573 $$ = SYMBOL_BLOCK_VALUE (tem); }
576 variable: block COLONCOLON name
577 { struct symbol *sym;
578 sym = lookup_symbol (copy_name ($3), $1,
579 VAR_NAMESPACE, (int *) NULL,
580 (struct symtab **) NULL);
582 error ("No symbol \"%s\" in specified context.",
585 write_exp_elt_opcode (OP_VAR_VALUE);
586 /* block_found is set by lookup_symbol. */
587 write_exp_elt_block (block_found);
588 write_exp_elt_sym (sym);
589 write_exp_elt_opcode (OP_VAR_VALUE); }
592 qualified_name: typebase COLONCOLON name
594 struct type *type = $1;
595 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
596 && TYPE_CODE (type) != TYPE_CODE_UNION)
597 error ("`%s' is not defined as an aggregate type.",
600 write_exp_elt_opcode (OP_SCOPE);
601 write_exp_elt_type (type);
602 write_exp_string ($3);
603 write_exp_elt_opcode (OP_SCOPE);
605 | typebase COLONCOLON '~' name
607 struct type *type = $1;
608 struct stoken tmp_token;
609 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
610 && TYPE_CODE (type) != TYPE_CODE_UNION)
611 error ("`%s' is not defined as an aggregate type.",
614 tmp_token.ptr = (char*) alloca ($4.length + 2);
615 tmp_token.length = $4.length + 1;
616 tmp_token.ptr[0] = '~';
617 memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
618 tmp_token.ptr[tmp_token.length] = 0;
620 /* Check for valid destructor name. */
621 destructor_name_p (tmp_token.ptr, type);
622 write_exp_elt_opcode (OP_SCOPE);
623 write_exp_elt_type (type);
624 write_exp_string (tmp_token);
625 write_exp_elt_opcode (OP_SCOPE);
629 variable: qualified_name
632 char *name = copy_name ($2);
634 struct minimal_symbol *msymbol;
637 lookup_symbol (name, (const struct block *) NULL,
638 VAR_NAMESPACE, (int *) NULL,
639 (struct symtab **) NULL);
642 write_exp_elt_opcode (OP_VAR_VALUE);
643 write_exp_elt_block (NULL);
644 write_exp_elt_sym (sym);
645 write_exp_elt_opcode (OP_VAR_VALUE);
649 msymbol = lookup_minimal_symbol (name, NULL, NULL);
652 write_exp_msymbol (msymbol,
653 lookup_function_type (builtin_type_int),
657 if (!have_full_symbols () && !have_partial_symbols ())
658 error ("No symbol table is loaded. Use the \"file\" command.");
660 error ("No symbol \"%s\" in current context.", name);
664 variable: name_not_typename
665 { struct symbol *sym = $1.sym;
669 if (symbol_read_needs_frame (sym))
671 if (innermost_block == 0 ||
672 contained_in (block_found,
674 innermost_block = block_found;
677 write_exp_elt_opcode (OP_VAR_VALUE);
678 /* We want to use the selected frame, not
679 another more inner frame which happens to
680 be in the same block. */
681 write_exp_elt_block (NULL);
682 write_exp_elt_sym (sym);
683 write_exp_elt_opcode (OP_VAR_VALUE);
685 else if ($1.is_a_field_of_this)
687 /* C++: it hangs off of `this'. Must
688 not inadvertently convert from a method call
690 if (innermost_block == 0 ||
691 contained_in (block_found, innermost_block))
692 innermost_block = block_found;
693 write_exp_elt_opcode (OP_THIS);
694 write_exp_elt_opcode (OP_THIS);
695 write_exp_elt_opcode (STRUCTOP_PTR);
696 write_exp_string ($1.stoken);
697 write_exp_elt_opcode (STRUCTOP_PTR);
701 struct minimal_symbol *msymbol;
702 register char *arg = copy_name ($1.stoken);
705 lookup_minimal_symbol (arg, NULL, NULL);
708 write_exp_msymbol (msymbol,
709 lookup_function_type (builtin_type_int),
712 else if (!have_full_symbols () && !have_partial_symbols ())
713 error ("No symbol table is loaded. Use the \"file\" command.");
715 error ("No symbol \"%s\" in current context.",
716 copy_name ($1.stoken));
723 /* "const" and "volatile" are curently ignored. A type qualifier
724 before the type is currently handled in the typebase rule.
725 The reason for recognizing these here (shift/reduce conflicts)
726 might be obsolete now that some pointer to member rules have
728 | typebase CONST_KEYWORD
729 | typebase VOLATILE_KEYWORD
731 { $$ = follow_types ($1); }
732 | typebase CONST_KEYWORD abs_decl
733 { $$ = follow_types ($1); }
734 | typebase VOLATILE_KEYWORD abs_decl
735 { $$ = follow_types ($1); }
739 { push_type (tp_pointer); $$ = 0; }
741 { push_type (tp_pointer); $$ = $2; }
743 { push_type (tp_reference); $$ = 0; }
745 { push_type (tp_reference); $$ = $2; }
749 direct_abs_decl: '(' abs_decl ')'
751 | direct_abs_decl array_mod
754 push_type (tp_array);
759 push_type (tp_array);
763 | direct_abs_decl func_mod
764 { push_type (tp_function); }
766 { push_type (tp_function); }
777 | '(' nonempty_typelist ')'
778 { free ((PTR)$2); $$ = 0; }
781 /* We used to try to recognize more pointer to member types here, but
782 that didn't work (shift/reduce conflicts meant that these rules never
783 got executed). The problem is that
784 int (foo::bar::baz::bizzle)
785 is a function type but
786 int (foo::bar::baz::bizzle::*)
787 is a pointer to member type. Stroustrup loses again! */
790 | typebase COLONCOLON '*'
791 { $$ = lookup_member_type (builtin_type_int, $1); }
794 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
798 { $$ = builtin_type_int; }
800 { $$ = builtin_type_long; }
802 { $$ = builtin_type_short; }
804 { $$ = builtin_type_long; }
805 | UNSIGNED LONG INT_KEYWORD
806 { $$ = builtin_type_unsigned_long; }
808 { $$ = builtin_type_long_long; }
809 | LONG LONG INT_KEYWORD
810 { $$ = builtin_type_long_long; }
812 { $$ = builtin_type_unsigned_long_long; }
813 | UNSIGNED LONG LONG INT_KEYWORD
814 { $$ = builtin_type_unsigned_long_long; }
816 { $$ = builtin_type_short; }
817 | UNSIGNED SHORT INT_KEYWORD
818 { $$ = builtin_type_unsigned_short; }
820 { $$ = builtin_type_double; }
821 | LONG DOUBLE_KEYWORD
822 { $$ = builtin_type_long_double; }
824 { $$ = lookup_struct (copy_name ($2),
825 expression_context_block); }
827 { $$ = lookup_struct (copy_name ($2),
828 expression_context_block); }
830 { $$ = lookup_union (copy_name ($2),
831 expression_context_block); }
833 { $$ = lookup_enum (copy_name ($2),
834 expression_context_block); }
836 { $$ = lookup_unsigned_typename (TYPE_NAME($2.type)); }
838 { $$ = builtin_type_unsigned_int; }
839 | SIGNED_KEYWORD typename
840 { $$ = lookup_signed_typename (TYPE_NAME($2.type)); }
842 { $$ = builtin_type_int; }
843 /* It appears that this rule for templates is never
844 reduced; template recognition happens by lookahead
845 in the token processing code in yylex. */
846 | TEMPLATE name '<' type '>'
847 { $$ = lookup_template_type(copy_name($2), $4,
848 expression_context_block);
850 /* "const" and "volatile" are curently ignored. A type qualifier
851 after the type is handled in the ptype rule. I think these could
853 | CONST_KEYWORD typebase { $$ = $2; }
854 | VOLATILE_KEYWORD typebase { $$ = $2; }
860 $$.stoken.ptr = "int";
861 $$.stoken.length = 3;
862 $$.type = builtin_type_int;
866 $$.stoken.ptr = "long";
867 $$.stoken.length = 4;
868 $$.type = builtin_type_long;
872 $$.stoken.ptr = "short";
873 $$.stoken.length = 5;
874 $$.type = builtin_type_short;
880 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
881 $<ivec>$[0] = 1; /* Number of types in vector */
884 | nonempty_typelist ',' type
885 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
886 $$ = (struct type **) realloc ((char *) $1, len);
887 $$[$<ivec>$[0]] = $3;
891 name : NAME { $$ = $1.stoken; }
892 | BLOCKNAME { $$ = $1.stoken; }
893 | TYPENAME { $$ = $1.stoken; }
894 | NAME_OR_INT { $$ = $1.stoken; }
897 name_not_typename : NAME
899 /* These would be useful if name_not_typename was useful, but it is just
900 a fake for "variable", so these cause reduce/reduce conflicts because
901 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
902 =exp) or just an exp. If name_not_typename was ever used in an lvalue
903 context where only a name could occur, this might be useful.
910 /* Take care of parsing a number (anything that starts with a digit).
911 Set yylval and return the token type; update lexptr.
912 LEN is the number of characters in it. */
914 /*** Needs some error checking for the float case ***/
917 parse_number (p, len, parsed_float, putithere)
923 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
924 here, and we do kind of silly things like cast to unsigned. */
925 register LONGEST n = 0;
926 register LONGEST prevn = 0;
931 register int base = input_radix;
934 /* Number of "L" suffixes encountered. */
937 /* We have found a "L" or "U" suffix. */
938 int found_suffix = 0;
941 struct type *signed_type;
942 struct type *unsigned_type;
946 /* It's a float since it contains a point or an exponent. */
948 int num = 0; /* number of tokens scanned by scanf */
949 char saved_char = p[len];
951 p[len] = 0; /* null-terminate the token */
952 if (sizeof (putithere->typed_val_float.dval) <= sizeof (float))
953 num = sscanf (p, "%g%c", (float *) &putithere->typed_val_float.dval,&c);
954 else if (sizeof (putithere->typed_val_float.dval) <= sizeof (double))
955 num = sscanf (p, "%lg%c", (double *) &putithere->typed_val_float.dval,&c);
958 #ifdef SCANF_HAS_LONG_DOUBLE
959 num = sscanf (p, "%Lg%c", &putithere->typed_val_float.dval,&c);
961 /* Scan it into a double, then assign it to the long double.
962 This at least wins with values representable in the range
965 num = sscanf (p, "%lg%c", &temp,&c);
966 putithere->typed_val_float.dval = temp;
969 p[len] = saved_char; /* restore the input stream */
970 if (num != 1) /* check scanf found ONLY a float ... */
972 /* See if it has `f' or `l' suffix (float or long double). */
974 c = tolower (p[len - 1]);
977 putithere->typed_val_float.type = builtin_type_float;
979 putithere->typed_val_float.type = builtin_type_long_double;
980 else if (isdigit (c) || c == '.')
981 putithere->typed_val_float.type = builtin_type_double;
988 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1022 if (c >= 'A' && c <= 'Z')
1024 if (c != 'l' && c != 'u')
1026 if (c >= '0' && c <= '9')
1034 if (base > 10 && c >= 'a' && c <= 'f')
1038 n += i = c - 'a' + 10;
1051 return ERROR; /* Char not a digit */
1054 return ERROR; /* Invalid digit in this base */
1056 /* Portably test for overflow (only works for nonzero values, so make
1057 a second check for zero). FIXME: Can't we just make n and prevn
1058 unsigned and avoid this? */
1059 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1060 unsigned_p = 1; /* Try something unsigned */
1062 /* Portably test for unsigned overflow.
1063 FIXME: This check is wrong; for example it doesn't find overflow
1064 on 0x123456789 when LONGEST is 32 bits. */
1065 if (c != 'l' && c != 'u' && n != 0)
1067 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
1068 error ("Numeric constant too large.");
1073 /* An integer constant is an int, a long, or a long long. An L
1074 suffix forces it to be long; an LL suffix forces it to be long
1075 long. If not forced to a larger size, it gets the first type of
1076 the above that it fits in. To figure out whether it fits, we
1077 shift it right and see whether anything remains. Note that we
1078 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1079 operation, because many compilers will warn about such a shift
1080 (which always produces a zero result). Sometimes TARGET_INT_BIT
1081 or TARGET_LONG_BIT will be that big, sometimes not. To deal with
1082 the case where it is we just always shift the value more than
1083 once, with fewer bits each time. */
1085 un = (ULONGEST)n >> 2;
1087 && (un >> (TARGET_INT_BIT - 2)) == 0)
1089 high_bit = ((ULONGEST)1) << (TARGET_INT_BIT-1);
1091 /* A large decimal (not hex or octal) constant (between INT_MAX
1092 and UINT_MAX) is a long or unsigned long, according to ANSI,
1093 never an unsigned int, but this code treats it as unsigned
1094 int. This probably should be fixed. GCC gives a warning on
1097 unsigned_type = builtin_type_unsigned_int;
1098 signed_type = builtin_type_int;
1100 else if (long_p <= 1
1101 && (un >> (TARGET_LONG_BIT - 2)) == 0)
1103 high_bit = ((ULONGEST)1) << (TARGET_LONG_BIT-1);
1104 unsigned_type = builtin_type_unsigned_long;
1105 signed_type = builtin_type_long;
1110 if (sizeof (ULONGEST) * HOST_CHAR_BIT < TARGET_LONG_LONG_BIT)
1111 /* A long long does not fit in a LONGEST. */
1112 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1114 shift = (TARGET_LONG_LONG_BIT - 1);
1115 high_bit = (ULONGEST) 1 << shift;
1116 unsigned_type = builtin_type_unsigned_long_long;
1117 signed_type = builtin_type_long_long;
1120 putithere->typed_val_int.val = n;
1122 /* If the high bit of the worked out type is set then this number
1123 has to be unsigned. */
1125 if (unsigned_p || (n & high_bit))
1127 putithere->typed_val_int.type = unsigned_type;
1131 putithere->typed_val_int.type = signed_type;
1141 enum exp_opcode opcode;
1144 static const struct token tokentab3[] =
1146 {">>=", ASSIGN_MODIFY, BINOP_RSH},
1147 {"<<=", ASSIGN_MODIFY, BINOP_LSH}
1150 static const struct token tokentab2[] =
1152 {"+=", ASSIGN_MODIFY, BINOP_ADD},
1153 {"-=", ASSIGN_MODIFY, BINOP_SUB},
1154 {"*=", ASSIGN_MODIFY, BINOP_MUL},
1155 {"/=", ASSIGN_MODIFY, BINOP_DIV},
1156 {"%=", ASSIGN_MODIFY, BINOP_REM},
1157 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR},
1158 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND},
1159 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR},
1160 {"++", INCREMENT, BINOP_END},
1161 {"--", DECREMENT, BINOP_END},
1162 {"->", ARROW, BINOP_END},
1163 {"&&", ANDAND, BINOP_END},
1164 {"||", OROR, BINOP_END},
1165 {"::", COLONCOLON, BINOP_END},
1166 {"<<", LSH, BINOP_END},
1167 {">>", RSH, BINOP_END},
1168 {"==", EQUAL, BINOP_END},
1169 {"!=", NOTEQUAL, BINOP_END},
1170 {"<=", LEQ, BINOP_END},
1171 {">=", GEQ, BINOP_END}
1174 /* Read one token, getting characters through lexptr. */
1185 static char *tempbuf;
1186 static int tempbufsize;
1187 struct symbol * sym_class = NULL;
1188 char * token_string = NULL;
1189 int class_prefix = 0;
1197 /* See if it is a special token of length 3. */
1198 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
1199 if (STREQN (tokstart, tokentab3[i].operator, 3))
1202 yylval.opcode = tokentab3[i].opcode;
1203 return tokentab3[i].token;
1206 /* See if it is a special token of length 2. */
1207 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
1208 if (STREQN (tokstart, tokentab2[i].operator, 2))
1211 yylval.opcode = tokentab2[i].opcode;
1212 return tokentab2[i].token;
1215 switch (c = *tokstart)
1227 /* We either have a character constant ('0' or '\177' for example)
1228 or we have a quoted symbol reference ('foo(int,int)' in C++
1233 c = parse_escape (&lexptr);
1235 error ("Empty character constant.");
1237 yylval.typed_val_int.val = c;
1238 yylval.typed_val_int.type = builtin_type_char;
1243 namelen = skip_quoted (tokstart) - tokstart;
1246 lexptr = tokstart + namelen;
1248 if (lexptr[-1] != '\'')
1249 error ("Unmatched single quote.");
1254 error ("Invalid character constant.");
1264 if (paren_depth == 0)
1271 if (comma_terminates && paren_depth == 0)
1277 /* Might be a floating point number. */
1278 if (lexptr[1] < '0' || lexptr[1] > '9')
1279 goto symbol; /* Nope, must be a symbol. */
1280 /* FALL THRU into number case. */
1293 /* It's a number. */
1294 int got_dot = 0, got_e = 0, toktype;
1295 register char *p = tokstart;
1296 int hex = input_radix > 10;
1298 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1303 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1311 /* This test includes !hex because 'e' is a valid hex digit
1312 and thus does not indicate a floating point number when
1313 the radix is hex. */
1314 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1315 got_dot = got_e = 1;
1316 /* This test does not include !hex, because a '.' always indicates
1317 a decimal floating point number regardless of the radix. */
1318 else if (!got_dot && *p == '.')
1320 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1321 && (*p == '-' || *p == '+'))
1322 /* This is the sign of the exponent, not the end of the
1325 /* We will take any letters or digits. parse_number will
1326 complain if past the radix, or if L or U are not final. */
1327 else if ((*p < '0' || *p > '9')
1328 && ((*p < 'a' || *p > 'z')
1329 && (*p < 'A' || *p > 'Z')))
1332 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
1333 if (toktype == ERROR)
1335 char *err_copy = (char *) alloca (p - tokstart + 1);
1337 memcpy (err_copy, tokstart, p - tokstart);
1338 err_copy[p - tokstart] = 0;
1339 error ("Invalid number \"%s\".", err_copy);
1371 /* Build the gdb internal form of the input string in tempbuf,
1372 translating any standard C escape forms seen. Note that the
1373 buffer is null byte terminated *only* for the convenience of
1374 debugging gdb itself and printing the buffer contents when
1375 the buffer contains no embedded nulls. Gdb does not depend
1376 upon the buffer being null byte terminated, it uses the length
1377 string instead. This allows gdb to handle C strings (as well
1378 as strings in other languages) with embedded null bytes */
1380 tokptr = ++tokstart;
1384 /* Grow the static temp buffer if necessary, including allocating
1385 the first one on demand. */
1386 if (tempbufindex + 1 >= tempbufsize)
1388 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1394 /* Do nothing, loop will terminate. */
1398 c = parse_escape (&tokptr);
1403 tempbuf[tempbufindex++] = c;
1406 tempbuf[tempbufindex++] = *tokptr++;
1409 } while ((*tokptr != '"') && (*tokptr != '\0'));
1410 if (*tokptr++ != '"')
1412 error ("Unterminated string in expression.");
1414 tempbuf[tempbufindex] = '\0'; /* See note above */
1415 yylval.sval.ptr = tempbuf;
1416 yylval.sval.length = tempbufindex;
1421 if (!(c == '_' || c == '$'
1422 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1423 /* We must have come across a bad character (e.g. ';'). */
1424 error ("Invalid character '%c' in expression.", c);
1426 /* It's a name. See how long it is. */
1428 for (c = tokstart[namelen];
1429 (c == '_' || c == '$' || (c >= '0' && c <= '9')
1430 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1432 /* Template parameter lists are part of the name.
1433 FIXME: This mishandles `print $a<4&&$a>3'. */
1437 /* Scan ahead to get rest of the template specification. Note
1438 that we look ahead only when the '<' adjoins non-whitespace
1439 characters; for comparison expressions, e.g. "a < b > c",
1440 there must be spaces before the '<', etc. */
1442 char * p = find_template_name_end (tokstart + namelen);
1444 namelen = p - tokstart;
1447 c = tokstart[++namelen];
1450 /* The token "if" terminates the expression and is NOT
1451 removed from the input stream. */
1452 if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
1461 /* Catch specific keywords. Should be done with a data structure. */
1465 if (STREQN (tokstart, "unsigned", 8))
1467 if (current_language->la_language == language_cplus
1468 && STREQN (tokstart, "template", 8))
1470 if (STREQN (tokstart, "volatile", 8))
1471 return VOLATILE_KEYWORD;
1474 if (STREQN (tokstart, "struct", 6))
1476 if (STREQN (tokstart, "signed", 6))
1477 return SIGNED_KEYWORD;
1478 if (STREQN (tokstart, "sizeof", 6))
1480 if (STREQN (tokstart, "double", 6))
1481 return DOUBLE_KEYWORD;
1484 if (current_language->la_language == language_cplus)
1486 if (STREQN (tokstart, "false", 5))
1487 return FALSEKEYWORD;
1488 if (STREQN (tokstart, "class", 5))
1491 if (STREQN (tokstart, "union", 5))
1493 if (STREQN (tokstart, "short", 5))
1495 if (STREQN (tokstart, "const", 5))
1496 return CONST_KEYWORD;
1499 if (STREQN (tokstart, "enum", 4))
1501 if (STREQN (tokstart, "long", 4))
1503 if (current_language->la_language == language_cplus)
1505 if (STREQN (tokstart, "true", 4))
1508 if (STREQN (tokstart, "this", 4))
1510 static const char this_name[] =
1511 { CPLUS_MARKER, 't', 'h', 'i', 's', '\0' };
1513 if (lookup_symbol (this_name, expression_context_block,
1514 VAR_NAMESPACE, (int *) NULL,
1515 (struct symtab **) NULL))
1521 if (STREQN (tokstart, "int", 3))
1528 yylval.sval.ptr = tokstart;
1529 yylval.sval.length = namelen;
1531 if (*tokstart == '$')
1533 write_dollar_variable (yylval.sval);
1537 /* Look ahead and see if we can consume more of the input
1538 string to get a reasonable class/namespace spec or a
1539 fully-qualified name. This is a kludge to get around the
1540 HP aCC compiler's generation of symbol names with embedded
1541 colons for namespace and nested classes. */
1544 /* Only do it if not inside single quotes */
1545 sym_class = parse_nested_classes_for_hpacc (yylval.sval.ptr, yylval.sval.length,
1546 &token_string, &class_prefix, &lexptr);
1549 /* Replace the current token with the bigger one we found */
1550 yylval.sval.ptr = token_string;
1551 yylval.sval.length = strlen (token_string);
1555 /* Use token-type BLOCKNAME for symbols that happen to be defined as
1556 functions or symtabs. If this is not so, then ...
1557 Use token-type TYPENAME for symbols that happen to be defined
1558 currently as names of types; NAME for other symbols.
1559 The caller is not constrained to care about the distinction. */
1561 char *tmp = copy_name (yylval.sval);
1563 int is_a_field_of_this = 0;
1566 sym = lookup_symbol (tmp, expression_context_block,
1568 current_language->la_language == language_cplus
1569 ? &is_a_field_of_this : (int *) NULL,
1570 (struct symtab **) NULL);
1571 /* Call lookup_symtab, not lookup_partial_symtab, in case there are
1572 no psymtabs (coff, xcoff, or some future change to blow away the
1573 psymtabs once once symbols are read). */
1574 if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
1576 yylval.ssym.sym = sym;
1577 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1581 { /* See if it's a file name. */
1582 struct symtab *symtab;
1584 symtab = lookup_symtab (tmp);
1588 yylval.bval = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), STATIC_BLOCK);
1593 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1596 /* Despite the following flaw, we need to keep this code enabled.
1597 Because we can get called from check_stub_method, if we don't
1598 handle nested types then it screws many operations in any
1599 program which uses nested types. */
1600 /* In "A::x", if x is a member function of A and there happens
1601 to be a type (nested or not, since the stabs don't make that
1602 distinction) named x, then this code incorrectly thinks we
1603 are dealing with nested types rather than a member function. */
1607 struct symbol *best_sym;
1609 /* Look ahead to detect nested types. This probably should be
1610 done in the grammar, but trying seemed to introduce a lot
1611 of shift/reduce and reduce/reduce conflicts. It's possible
1612 that it could be done, though. Or perhaps a non-grammar, but
1613 less ad hoc, approach would work well. */
1615 /* Since we do not currently have any way of distinguishing
1616 a nested type from a non-nested one (the stabs don't tell
1617 us whether a type is nested), we just ignore the
1624 /* Skip whitespace. */
1625 while (*p == ' ' || *p == '\t' || *p == '\n')
1627 if (*p == ':' && p[1] == ':')
1629 /* Skip the `::'. */
1631 /* Skip whitespace. */
1632 while (*p == ' ' || *p == '\t' || *p == '\n')
1635 while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1636 || (*p >= 'a' && *p <= 'z')
1637 || (*p >= 'A' && *p <= 'Z'))
1641 struct symbol *cur_sym;
1642 /* As big as the whole rest of the expression, which is
1643 at least big enough. */
1644 char *ncopy = alloca (strlen (tmp)+strlen (namestart)+3);
1648 memcpy (tmp1, tmp, strlen (tmp));
1649 tmp1 += strlen (tmp);
1650 memcpy (tmp1, "::", 2);
1652 memcpy (tmp1, namestart, p - namestart);
1653 tmp1[p - namestart] = '\0';
1654 cur_sym = lookup_symbol (ncopy, expression_context_block,
1655 VAR_NAMESPACE, (int *) NULL,
1656 (struct symtab **) NULL);
1659 if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1677 yylval.tsym.type = SYMBOL_TYPE (best_sym);
1679 yylval.tsym.type = SYMBOL_TYPE (sym);
1683 if ((yylval.tsym.type = lookup_primitive_typename (tmp)) != 0)
1686 /* Input names that aren't symbols but ARE valid hex numbers,
1687 when the input radix permits them, can be names or numbers
1688 depending on the parse. Note we support radixes > 16 here. */
1690 ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1691 (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1693 YYSTYPE newlval; /* Its value is ignored. */
1694 hextype = parse_number (tokstart, namelen, 0, &newlval);
1697 yylval.ssym.sym = sym;
1698 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1703 /* Any other kind of symbol */
1704 yylval.ssym.sym = sym;
1705 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1714 error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);