1 /* YACC parser for C expressions, for GDB.
2 Copyright (C) 1986, 1989, 1990, 1991, 1993, 1994, 1996, 1997
3 Free Software Foundation, Inc.
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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* Parse a C expression from text in a string,
22 and return the result as a struct expression pointer.
23 That structure contains arithmetic operations in reverse polish,
24 with constants represented by operations that are followed by special data.
25 See expression.h for the details of the format.
26 What is important here is that it can be built up sequentially
27 during the process of parsing; the lower levels of the tree always
28 come first in the result.
30 Note that malloc's and realloc's in this file are transformed to
31 xmalloc and xrealloc respectively by the same sed command in the
32 makefile that remaps any other malloc/realloc inserted by the parser
33 generator. Doing this with #defines and trying to control the interaction
34 with include files (<malloc.h> and <stdlib.h> for example) just became
35 too messy, particularly when such includes can be inserted at random
36 times by the parser generator. */
41 #include "gdb_string.h"
43 #include "expression.h"
45 #include "parser-defs.h"
48 #include "bfd.h" /* Required by objfiles.h. */
49 #include "symfile.h" /* Required by objfiles.h. */
50 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
52 /* Flag indicating we're dealing with HP-compiled objects */
53 extern int hp_som_som_object_present;
55 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
56 as well as gratuitiously global symbol names, so we can have multiple
57 yacc generated parsers in gdb. Note that these are only the variables
58 produced by yacc. If other parser generators (bison, byacc, etc) produce
59 additional global names that conflict at link time, then those parser
60 generators need to be fixed instead of adding those names to this list. */
62 #define yymaxdepth c_maxdepth
63 #define yyparse c_parse
65 #define yyerror c_error
68 #define yydebug c_debug
77 #define yyerrflag c_errflag
78 #define yynerrs c_nerrs
83 #define yystate c_state
89 #define yyreds c_reds /* With YYDEBUG defined */
90 #define yytoks c_toks /* With YYDEBUG defined */
93 #define yydefred c_yydefred
94 #define yydgoto c_yydgoto
95 #define yysindex c_yysindex
96 #define yyrindex c_yyrindex
97 #define yygindex c_yygindex
98 #define yytable c_yytable
99 #define yycheck c_yycheck
102 #define YYDEBUG 0 /* Default to no yydebug support */
107 static int yylex (void);
109 void yyerror (char *);
113 /* Although the yacc "value" of an expression is not used,
114 since the result is stored in the structure being created,
115 other node types do have values. */
132 struct symtoken ssym;
135 enum exp_opcode opcode;
136 struct internalvar *ivar;
143 /* YYSTYPE gets defined by %union */
144 static int parse_number (char *, int, int, YYSTYPE *);
147 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
149 %type <tval> type typebase
150 %type <tvec> nonempty_typelist
151 /* %type <bval> block */
153 /* Fancy type parsing. */
154 %type <voidval> func_mod direct_abs_decl abs_decl
156 %type <lval> array_mod
158 %token <typed_val_int> INT
159 %token <typed_val_float> FLOAT
161 /* Both NAME and TYPENAME tokens represent symbols in the input,
162 and both convey their data as strings.
163 But a TYPENAME is a string that happens to be defined as a typedef
164 or builtin type name (such as int or char)
165 and a NAME is any other symbol.
166 Contexts where this distinction is not important can use the
167 nonterminal "name", which matches either NAME or TYPENAME. */
170 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
171 %token <tsym> TYPENAME
173 %type <ssym> name_not_typename
174 %type <tsym> typename
176 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
177 but which would parse as a valid number in the current input radix.
178 E.g. "c" when input_radix==16. Depending on the parse, it will be
179 turned into a name or into a number. */
181 %token <ssym> NAME_OR_INT
183 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
187 /* Special type cases, put in to allow the parser to distinguish different
189 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
191 %token <voidval> VARIABLE
193 %token <opcode> ASSIGN_MODIFY
203 %right '=' ASSIGN_MODIFY
211 %left '<' '>' LEQ GEQ
216 %right UNARY INCREMENT DECREMENT
217 %right ARROW '.' '[' '('
218 %token <ssym> BLOCKNAME
219 %token <bval> FILENAME
231 { write_exp_elt_opcode(OP_TYPE);
232 write_exp_elt_type($1);
233 write_exp_elt_opcode(OP_TYPE);}
236 /* Expressions, including the comma operator. */
239 { write_exp_elt_opcode (BINOP_COMMA); }
242 /* Expressions, not including the comma operator. */
243 exp : '*' exp %prec UNARY
244 { write_exp_elt_opcode (UNOP_IND); }
246 exp : '&' exp %prec UNARY
247 { write_exp_elt_opcode (UNOP_ADDR); }
249 exp : '-' exp %prec UNARY
250 { write_exp_elt_opcode (UNOP_NEG); }
253 exp : '!' exp %prec UNARY
254 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
257 exp : '~' exp %prec UNARY
258 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
261 exp : INCREMENT exp %prec UNARY
262 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
265 exp : DECREMENT exp %prec UNARY
266 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
269 exp : exp INCREMENT %prec UNARY
270 { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
273 exp : exp DECREMENT %prec UNARY
274 { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
277 exp : SIZEOF exp %prec UNARY
278 { write_exp_elt_opcode (UNOP_SIZEOF); }
282 { write_exp_elt_opcode (STRUCTOP_PTR);
283 write_exp_string ($3);
284 write_exp_elt_opcode (STRUCTOP_PTR); }
287 exp : exp ARROW qualified_name
288 { /* exp->type::name becomes exp->*(&type::name) */
289 /* Note: this doesn't work if name is a
290 static member! FIXME */
291 write_exp_elt_opcode (UNOP_ADDR);
292 write_exp_elt_opcode (STRUCTOP_MPTR); }
295 exp : exp ARROW '*' exp
296 { write_exp_elt_opcode (STRUCTOP_MPTR); }
300 { write_exp_elt_opcode (STRUCTOP_STRUCT);
301 write_exp_string ($3);
302 write_exp_elt_opcode (STRUCTOP_STRUCT); }
305 exp : exp '.' qualified_name
306 { /* exp.type::name becomes exp.*(&type::name) */
307 /* Note: this doesn't work if name is a
308 static member! FIXME */
309 write_exp_elt_opcode (UNOP_ADDR);
310 write_exp_elt_opcode (STRUCTOP_MEMBER); }
313 exp : exp '.' '*' exp
314 { write_exp_elt_opcode (STRUCTOP_MEMBER); }
317 exp : exp '[' exp1 ']'
318 { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
322 /* This is to save the value of arglist_len
323 being accumulated by an outer function call. */
324 { start_arglist (); }
325 arglist ')' %prec ARROW
326 { write_exp_elt_opcode (OP_FUNCALL);
327 write_exp_elt_longcst ((LONGEST) end_arglist ());
328 write_exp_elt_opcode (OP_FUNCALL); }
332 { start_arglist (); }
342 arglist : arglist ',' exp %prec ABOVE_COMMA
347 { $$ = end_arglist () - 1; }
349 exp : lcurly arglist rcurly %prec ARROW
350 { write_exp_elt_opcode (OP_ARRAY);
351 write_exp_elt_longcst ((LONGEST) 0);
352 write_exp_elt_longcst ((LONGEST) $3);
353 write_exp_elt_opcode (OP_ARRAY); }
356 exp : lcurly type rcurly exp %prec UNARY
357 { write_exp_elt_opcode (UNOP_MEMVAL);
358 write_exp_elt_type ($2);
359 write_exp_elt_opcode (UNOP_MEMVAL); }
362 exp : '(' type ')' exp %prec UNARY
363 { write_exp_elt_opcode (UNOP_CAST);
364 write_exp_elt_type ($2);
365 write_exp_elt_opcode (UNOP_CAST); }
372 /* Binary operators in order of decreasing precedence. */
375 { write_exp_elt_opcode (BINOP_REPEAT); }
379 { write_exp_elt_opcode (BINOP_MUL); }
383 { write_exp_elt_opcode (BINOP_DIV); }
387 { write_exp_elt_opcode (BINOP_REM); }
391 { write_exp_elt_opcode (BINOP_ADD); }
395 { write_exp_elt_opcode (BINOP_SUB); }
399 { write_exp_elt_opcode (BINOP_LSH); }
403 { write_exp_elt_opcode (BINOP_RSH); }
407 { write_exp_elt_opcode (BINOP_EQUAL); }
410 exp : exp NOTEQUAL exp
411 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
415 { write_exp_elt_opcode (BINOP_LEQ); }
419 { write_exp_elt_opcode (BINOP_GEQ); }
423 { write_exp_elt_opcode (BINOP_LESS); }
427 { write_exp_elt_opcode (BINOP_GTR); }
431 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
435 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
439 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
443 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
447 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
450 exp : exp '?' exp ':' exp %prec '?'
451 { write_exp_elt_opcode (TERNOP_COND); }
455 { write_exp_elt_opcode (BINOP_ASSIGN); }
458 exp : exp ASSIGN_MODIFY exp
459 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
460 write_exp_elt_opcode ($2);
461 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
465 { write_exp_elt_opcode (OP_LONG);
466 write_exp_elt_type ($1.type);
467 write_exp_elt_longcst ((LONGEST)($1.val));
468 write_exp_elt_opcode (OP_LONG); }
473 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
474 write_exp_elt_opcode (OP_LONG);
475 write_exp_elt_type (val.typed_val_int.type);
476 write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
477 write_exp_elt_opcode (OP_LONG);
483 { write_exp_elt_opcode (OP_DOUBLE);
484 write_exp_elt_type ($1.type);
485 write_exp_elt_dblcst ($1.dval);
486 write_exp_elt_opcode (OP_DOUBLE); }
493 /* Already written by write_dollar_variable. */
496 exp : SIZEOF '(' type ')' %prec UNARY
497 { write_exp_elt_opcode (OP_LONG);
498 write_exp_elt_type (builtin_type_int);
500 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
501 write_exp_elt_opcode (OP_LONG); }
505 { /* C strings are converted into array constants with
506 an explicit null byte added at the end. Thus
507 the array upper bound is the string length.
508 There is no such thing in C as a completely empty
510 char *sp = $1.ptr; int count = $1.length;
513 write_exp_elt_opcode (OP_LONG);
514 write_exp_elt_type (builtin_type_char);
515 write_exp_elt_longcst ((LONGEST)(*sp++));
516 write_exp_elt_opcode (OP_LONG);
518 write_exp_elt_opcode (OP_LONG);
519 write_exp_elt_type (builtin_type_char);
520 write_exp_elt_longcst ((LONGEST)'\0');
521 write_exp_elt_opcode (OP_LONG);
522 write_exp_elt_opcode (OP_ARRAY);
523 write_exp_elt_longcst ((LONGEST) 0);
524 write_exp_elt_longcst ((LONGEST) ($1.length));
525 write_exp_elt_opcode (OP_ARRAY); }
530 { write_exp_elt_opcode (OP_THIS);
531 write_exp_elt_opcode (OP_THIS); }
535 { write_exp_elt_opcode (OP_LONG);
536 write_exp_elt_type (builtin_type_bool);
537 write_exp_elt_longcst ((LONGEST) 1);
538 write_exp_elt_opcode (OP_LONG); }
542 { write_exp_elt_opcode (OP_LONG);
543 write_exp_elt_type (builtin_type_bool);
544 write_exp_elt_longcst ((LONGEST) 0);
545 write_exp_elt_opcode (OP_LONG); }
553 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
555 error ("No file or function \"%s\".",
556 copy_name ($1.stoken));
564 block : block COLONCOLON name
566 = lookup_symbol (copy_name ($3), $1,
567 VAR_NAMESPACE, (int *) NULL,
568 (struct symtab **) NULL);
569 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
570 error ("No function \"%s\" in specified context.",
572 $$ = SYMBOL_BLOCK_VALUE (tem); }
575 variable: block COLONCOLON name
576 { struct symbol *sym;
577 sym = lookup_symbol (copy_name ($3), $1,
578 VAR_NAMESPACE, (int *) NULL,
579 (struct symtab **) NULL);
581 error ("No symbol \"%s\" in specified context.",
584 write_exp_elt_opcode (OP_VAR_VALUE);
585 /* block_found is set by lookup_symbol. */
586 write_exp_elt_block (block_found);
587 write_exp_elt_sym (sym);
588 write_exp_elt_opcode (OP_VAR_VALUE); }
591 qualified_name: typebase COLONCOLON name
593 struct type *type = $1;
594 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
595 && TYPE_CODE (type) != TYPE_CODE_UNION)
596 error ("`%s' is not defined as an aggregate type.",
599 write_exp_elt_opcode (OP_SCOPE);
600 write_exp_elt_type (type);
601 write_exp_string ($3);
602 write_exp_elt_opcode (OP_SCOPE);
604 | typebase COLONCOLON '~' name
606 struct type *type = $1;
607 struct stoken tmp_token;
608 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
609 && TYPE_CODE (type) != TYPE_CODE_UNION)
610 error ("`%s' is not defined as an aggregate type.",
613 tmp_token.ptr = (char*) alloca ($4.length + 2);
614 tmp_token.length = $4.length + 1;
615 tmp_token.ptr[0] = '~';
616 memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
617 tmp_token.ptr[tmp_token.length] = 0;
619 /* Check for valid destructor name. */
620 destructor_name_p (tmp_token.ptr, type);
621 write_exp_elt_opcode (OP_SCOPE);
622 write_exp_elt_type (type);
623 write_exp_string (tmp_token);
624 write_exp_elt_opcode (OP_SCOPE);
628 variable: qualified_name
631 char *name = copy_name ($2);
633 struct minimal_symbol *msymbol;
636 lookup_symbol (name, (const struct block *) NULL,
637 VAR_NAMESPACE, (int *) NULL,
638 (struct symtab **) NULL);
641 write_exp_elt_opcode (OP_VAR_VALUE);
642 write_exp_elt_block (NULL);
643 write_exp_elt_sym (sym);
644 write_exp_elt_opcode (OP_VAR_VALUE);
648 msymbol = lookup_minimal_symbol (name, NULL, NULL);
651 write_exp_msymbol (msymbol,
652 lookup_function_type (builtin_type_int),
656 if (!have_full_symbols () && !have_partial_symbols ())
657 error ("No symbol table is loaded. Use the \"file\" command.");
659 error ("No symbol \"%s\" in current context.", name);
663 variable: name_not_typename
664 { struct symbol *sym = $1.sym;
668 if (symbol_read_needs_frame (sym))
670 if (innermost_block == 0 ||
671 contained_in (block_found,
673 innermost_block = block_found;
676 write_exp_elt_opcode (OP_VAR_VALUE);
677 /* We want to use the selected frame, not
678 another more inner frame which happens to
679 be in the same block. */
680 write_exp_elt_block (NULL);
681 write_exp_elt_sym (sym);
682 write_exp_elt_opcode (OP_VAR_VALUE);
684 else if ($1.is_a_field_of_this)
686 /* C++: it hangs off of `this'. Must
687 not inadvertently convert from a method call
689 if (innermost_block == 0 ||
690 contained_in (block_found, innermost_block))
691 innermost_block = block_found;
692 write_exp_elt_opcode (OP_THIS);
693 write_exp_elt_opcode (OP_THIS);
694 write_exp_elt_opcode (STRUCTOP_PTR);
695 write_exp_string ($1.stoken);
696 write_exp_elt_opcode (STRUCTOP_PTR);
700 struct minimal_symbol *msymbol;
701 register char *arg = copy_name ($1.stoken);
704 lookup_minimal_symbol (arg, NULL, NULL);
707 write_exp_msymbol (msymbol,
708 lookup_function_type (builtin_type_int),
711 else if (!have_full_symbols () && !have_partial_symbols ())
712 error ("No symbol table is loaded. Use the \"file\" command.");
714 error ("No symbol \"%s\" in current context.",
715 copy_name ($1.stoken));
722 /* "const" and "volatile" are curently ignored. A type qualifier
723 before the type is currently handled in the typebase rule.
724 The reason for recognizing these here (shift/reduce conflicts)
725 might be obsolete now that some pointer to member rules have
727 | typebase CONST_KEYWORD
728 | typebase VOLATILE_KEYWORD
730 { $$ = follow_types ($1); }
731 | typebase CONST_KEYWORD abs_decl
732 { $$ = follow_types ($1); }
733 | typebase VOLATILE_KEYWORD abs_decl
734 { $$ = follow_types ($1); }
738 { push_type (tp_pointer); $$ = 0; }
740 { push_type (tp_pointer); $$ = $2; }
742 { push_type (tp_reference); $$ = 0; }
744 { push_type (tp_reference); $$ = $2; }
748 direct_abs_decl: '(' abs_decl ')'
750 | direct_abs_decl array_mod
753 push_type (tp_array);
758 push_type (tp_array);
762 | direct_abs_decl func_mod
763 { push_type (tp_function); }
765 { push_type (tp_function); }
776 | '(' nonempty_typelist ')'
777 { free ((PTR)$2); $$ = 0; }
780 /* We used to try to recognize more pointer to member types here, but
781 that didn't work (shift/reduce conflicts meant that these rules never
782 got executed). The problem is that
783 int (foo::bar::baz::bizzle)
784 is a function type but
785 int (foo::bar::baz::bizzle::*)
786 is a pointer to member type. Stroustrup loses again! */
789 | typebase COLONCOLON '*'
790 { $$ = lookup_member_type (builtin_type_int, $1); }
793 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
797 { $$ = builtin_type_int; }
799 { $$ = builtin_type_long; }
801 { $$ = builtin_type_short; }
803 { $$ = builtin_type_long; }
804 | UNSIGNED LONG INT_KEYWORD
805 { $$ = builtin_type_unsigned_long; }
807 { $$ = builtin_type_long_long; }
808 | LONG LONG INT_KEYWORD
809 { $$ = builtin_type_long_long; }
811 { $$ = builtin_type_unsigned_long_long; }
812 | UNSIGNED LONG LONG INT_KEYWORD
813 { $$ = builtin_type_unsigned_long_long; }
815 { $$ = builtin_type_short; }
816 | UNSIGNED SHORT INT_KEYWORD
817 { $$ = builtin_type_unsigned_short; }
819 { $$ = builtin_type_double; }
820 | LONG DOUBLE_KEYWORD
821 { $$ = builtin_type_long_double; }
823 { $$ = lookup_struct (copy_name ($2),
824 expression_context_block); }
826 { $$ = lookup_struct (copy_name ($2),
827 expression_context_block); }
829 { $$ = lookup_union (copy_name ($2),
830 expression_context_block); }
832 { $$ = lookup_enum (copy_name ($2),
833 expression_context_block); }
835 { $$ = lookup_unsigned_typename (TYPE_NAME($2.type)); }
837 { $$ = builtin_type_unsigned_int; }
838 | SIGNED_KEYWORD typename
839 { $$ = lookup_signed_typename (TYPE_NAME($2.type)); }
841 { $$ = builtin_type_int; }
842 /* It appears that this rule for templates is never
843 reduced; template recognition happens by lookahead
844 in the token processing code in yylex. */
845 | TEMPLATE name '<' type '>'
846 { $$ = lookup_template_type(copy_name($2), $4,
847 expression_context_block);
849 /* "const" and "volatile" are curently ignored. A type qualifier
850 after the type is handled in the ptype rule. I think these could
852 | CONST_KEYWORD typebase { $$ = $2; }
853 | VOLATILE_KEYWORD typebase { $$ = $2; }
859 $$.stoken.ptr = "int";
860 $$.stoken.length = 3;
861 $$.type = builtin_type_int;
865 $$.stoken.ptr = "long";
866 $$.stoken.length = 4;
867 $$.type = builtin_type_long;
871 $$.stoken.ptr = "short";
872 $$.stoken.length = 5;
873 $$.type = builtin_type_short;
879 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
880 $<ivec>$[0] = 1; /* Number of types in vector */
883 | nonempty_typelist ',' type
884 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
885 $$ = (struct type **) realloc ((char *) $1, len);
886 $$[$<ivec>$[0]] = $3;
890 name : NAME { $$ = $1.stoken; }
891 | BLOCKNAME { $$ = $1.stoken; }
892 | TYPENAME { $$ = $1.stoken; }
893 | NAME_OR_INT { $$ = $1.stoken; }
896 name_not_typename : NAME
898 /* These would be useful if name_not_typename was useful, but it is just
899 a fake for "variable", so these cause reduce/reduce conflicts because
900 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
901 =exp) or just an exp. If name_not_typename was ever used in an lvalue
902 context where only a name could occur, this might be useful.
909 /* Take care of parsing a number (anything that starts with a digit).
910 Set yylval and return the token type; update lexptr.
911 LEN is the number of characters in it. */
913 /*** Needs some error checking for the float case ***/
916 parse_number (p, len, parsed_float, putithere)
922 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
923 here, and we do kind of silly things like cast to unsigned. */
924 register LONGEST n = 0;
925 register LONGEST prevn = 0;
930 register int base = input_radix;
933 /* Number of "L" suffixes encountered. */
936 /* We have found a "L" or "U" suffix. */
937 int found_suffix = 0;
940 struct type *signed_type;
941 struct type *unsigned_type;
945 /* It's a float since it contains a point or an exponent. */
947 int num = 0; /* number of tokens scanned by scanf */
948 char saved_char = p[len];
950 p[len] = 0; /* null-terminate the token */
951 if (sizeof (putithere->typed_val_float.dval) <= sizeof (float))
952 num = sscanf (p, "%g%c", (float *) &putithere->typed_val_float.dval,&c);
953 else if (sizeof (putithere->typed_val_float.dval) <= sizeof (double))
954 num = sscanf (p, "%lg%c", (double *) &putithere->typed_val_float.dval,&c);
957 #ifdef SCANF_HAS_LONG_DOUBLE
958 num = sscanf (p, "%Lg%c", &putithere->typed_val_float.dval,&c);
960 /* Scan it into a double, then assign it to the long double.
961 This at least wins with values representable in the range
964 num = sscanf (p, "%lg%c", &temp,&c);
965 putithere->typed_val_float.dval = temp;
968 p[len] = saved_char; /* restore the input stream */
969 if (num != 1) /* check scanf found ONLY a float ... */
971 /* See if it has `f' or `l' suffix (float or long double). */
973 c = tolower (p[len - 1]);
976 putithere->typed_val_float.type = builtin_type_float;
978 putithere->typed_val_float.type = builtin_type_long_double;
979 else if (isdigit (c) || c == '.')
980 putithere->typed_val_float.type = builtin_type_double;
987 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
1021 if (c >= 'A' && c <= 'Z')
1023 if (c != 'l' && c != 'u')
1025 if (c >= '0' && c <= '9')
1033 if (base > 10 && c >= 'a' && c <= 'f')
1037 n += i = c - 'a' + 10;
1050 return ERROR; /* Char not a digit */
1053 return ERROR; /* Invalid digit in this base */
1055 /* Portably test for overflow (only works for nonzero values, so make
1056 a second check for zero). FIXME: Can't we just make n and prevn
1057 unsigned and avoid this? */
1058 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1059 unsigned_p = 1; /* Try something unsigned */
1061 /* Portably test for unsigned overflow.
1062 FIXME: This check is wrong; for example it doesn't find overflow
1063 on 0x123456789 when LONGEST is 32 bits. */
1064 if (c != 'l' && c != 'u' && n != 0)
1066 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
1067 error ("Numeric constant too large.");
1072 /* An integer constant is an int, a long, or a long long. An L
1073 suffix forces it to be long; an LL suffix forces it to be long
1074 long. If not forced to a larger size, it gets the first type of
1075 the above that it fits in. To figure out whether it fits, we
1076 shift it right and see whether anything remains. Note that we
1077 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1078 operation, because many compilers will warn about such a shift
1079 (which always produces a zero result). Sometimes TARGET_INT_BIT
1080 or TARGET_LONG_BIT will be that big, sometimes not. To deal with
1081 the case where it is we just always shift the value more than
1082 once, with fewer bits each time. */
1084 un = (ULONGEST)n >> 2;
1086 && (un >> (TARGET_INT_BIT - 2)) == 0)
1088 high_bit = ((ULONGEST)1) << (TARGET_INT_BIT-1);
1090 /* A large decimal (not hex or octal) constant (between INT_MAX
1091 and UINT_MAX) is a long or unsigned long, according to ANSI,
1092 never an unsigned int, but this code treats it as unsigned
1093 int. This probably should be fixed. GCC gives a warning on
1096 unsigned_type = builtin_type_unsigned_int;
1097 signed_type = builtin_type_int;
1099 else if (long_p <= 1
1100 && (un >> (TARGET_LONG_BIT - 2)) == 0)
1102 high_bit = ((ULONGEST)1) << (TARGET_LONG_BIT-1);
1103 unsigned_type = builtin_type_unsigned_long;
1104 signed_type = builtin_type_long;
1109 if (sizeof (ULONGEST) * HOST_CHAR_BIT < TARGET_LONG_LONG_BIT)
1110 /* A long long does not fit in a LONGEST. */
1111 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1113 shift = (TARGET_LONG_LONG_BIT - 1);
1114 high_bit = (ULONGEST) 1 << shift;
1115 unsigned_type = builtin_type_unsigned_long_long;
1116 signed_type = builtin_type_long_long;
1119 putithere->typed_val_int.val = n;
1121 /* If the high bit of the worked out type is set then this number
1122 has to be unsigned. */
1124 if (unsigned_p || (n & high_bit))
1126 putithere->typed_val_int.type = unsigned_type;
1130 putithere->typed_val_int.type = signed_type;
1140 enum exp_opcode opcode;
1143 static const struct token tokentab3[] =
1145 {">>=", ASSIGN_MODIFY, BINOP_RSH},
1146 {"<<=", ASSIGN_MODIFY, BINOP_LSH}
1149 static const struct token tokentab2[] =
1151 {"+=", ASSIGN_MODIFY, BINOP_ADD},
1152 {"-=", ASSIGN_MODIFY, BINOP_SUB},
1153 {"*=", ASSIGN_MODIFY, BINOP_MUL},
1154 {"/=", ASSIGN_MODIFY, BINOP_DIV},
1155 {"%=", ASSIGN_MODIFY, BINOP_REM},
1156 {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR},
1157 {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND},
1158 {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR},
1159 {"++", INCREMENT, BINOP_END},
1160 {"--", DECREMENT, BINOP_END},
1161 {"->", ARROW, BINOP_END},
1162 {"&&", ANDAND, BINOP_END},
1163 {"||", OROR, BINOP_END},
1164 {"::", COLONCOLON, BINOP_END},
1165 {"<<", LSH, BINOP_END},
1166 {">>", RSH, BINOP_END},
1167 {"==", EQUAL, BINOP_END},
1168 {"!=", NOTEQUAL, BINOP_END},
1169 {"<=", LEQ, BINOP_END},
1170 {">=", GEQ, BINOP_END}
1173 /* Read one token, getting characters through lexptr. */
1184 static char *tempbuf;
1185 static int tempbufsize;
1186 struct symbol * sym_class = NULL;
1187 char * token_string = NULL;
1188 int class_prefix = 0;
1196 /* See if it is a special token of length 3. */
1197 for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
1198 if (STREQN (tokstart, tokentab3[i].operator, 3))
1201 yylval.opcode = tokentab3[i].opcode;
1202 return tokentab3[i].token;
1205 /* See if it is a special token of length 2. */
1206 for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
1207 if (STREQN (tokstart, tokentab2[i].operator, 2))
1210 yylval.opcode = tokentab2[i].opcode;
1211 return tokentab2[i].token;
1214 switch (c = *tokstart)
1226 /* We either have a character constant ('0' or '\177' for example)
1227 or we have a quoted symbol reference ('foo(int,int)' in C++
1232 c = parse_escape (&lexptr);
1234 error ("Empty character constant.");
1236 yylval.typed_val_int.val = c;
1237 yylval.typed_val_int.type = builtin_type_char;
1242 namelen = skip_quoted (tokstart) - tokstart;
1245 lexptr = tokstart + namelen;
1247 if (lexptr[-1] != '\'')
1248 error ("Unmatched single quote.");
1253 error ("Invalid character constant.");
1263 if (paren_depth == 0)
1270 if (comma_terminates && paren_depth == 0)
1276 /* Might be a floating point number. */
1277 if (lexptr[1] < '0' || lexptr[1] > '9')
1278 goto symbol; /* Nope, must be a symbol. */
1279 /* FALL THRU into number case. */
1292 /* It's a number. */
1293 int got_dot = 0, got_e = 0, toktype;
1294 register char *p = tokstart;
1295 int hex = input_radix > 10;
1297 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1302 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1310 /* This test includes !hex because 'e' is a valid hex digit
1311 and thus does not indicate a floating point number when
1312 the radix is hex. */
1313 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1314 got_dot = got_e = 1;
1315 /* This test does not include !hex, because a '.' always indicates
1316 a decimal floating point number regardless of the radix. */
1317 else if (!got_dot && *p == '.')
1319 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1320 && (*p == '-' || *p == '+'))
1321 /* This is the sign of the exponent, not the end of the
1324 /* We will take any letters or digits. parse_number will
1325 complain if past the radix, or if L or U are not final. */
1326 else if ((*p < '0' || *p > '9')
1327 && ((*p < 'a' || *p > 'z')
1328 && (*p < 'A' || *p > 'Z')))
1331 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
1332 if (toktype == ERROR)
1334 char *err_copy = (char *) alloca (p - tokstart + 1);
1336 memcpy (err_copy, tokstart, p - tokstart);
1337 err_copy[p - tokstart] = 0;
1338 error ("Invalid number \"%s\".", err_copy);
1370 /* Build the gdb internal form of the input string in tempbuf,
1371 translating any standard C escape forms seen. Note that the
1372 buffer is null byte terminated *only* for the convenience of
1373 debugging gdb itself and printing the buffer contents when
1374 the buffer contains no embedded nulls. Gdb does not depend
1375 upon the buffer being null byte terminated, it uses the length
1376 string instead. This allows gdb to handle C strings (as well
1377 as strings in other languages) with embedded null bytes */
1379 tokptr = ++tokstart;
1383 /* Grow the static temp buffer if necessary, including allocating
1384 the first one on demand. */
1385 if (tempbufindex + 1 >= tempbufsize)
1387 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1393 /* Do nothing, loop will terminate. */
1397 c = parse_escape (&tokptr);
1402 tempbuf[tempbufindex++] = c;
1405 tempbuf[tempbufindex++] = *tokptr++;
1408 } while ((*tokptr != '"') && (*tokptr != '\0'));
1409 if (*tokptr++ != '"')
1411 error ("Unterminated string in expression.");
1413 tempbuf[tempbufindex] = '\0'; /* See note above */
1414 yylval.sval.ptr = tempbuf;
1415 yylval.sval.length = tempbufindex;
1420 if (!(c == '_' || c == '$'
1421 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1422 /* We must have come across a bad character (e.g. ';'). */
1423 error ("Invalid character '%c' in expression.", c);
1425 /* It's a name. See how long it is. */
1427 for (c = tokstart[namelen];
1428 (c == '_' || c == '$' || (c >= '0' && c <= '9')
1429 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1431 /* Template parameter lists are part of the name.
1432 FIXME: This mishandles `print $a<4&&$a>3'. */
1436 /* Scan ahead to get rest of the template specification. Note
1437 that we look ahead only when the '<' adjoins non-whitespace
1438 characters; for comparison expressions, e.g. "a < b > c",
1439 there must be spaces before the '<', etc. */
1441 char * p = find_template_name_end (tokstart + namelen);
1443 namelen = p - tokstart;
1446 c = tokstart[++namelen];
1449 /* The token "if" terminates the expression and is NOT
1450 removed from the input stream. */
1451 if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
1460 /* Catch specific keywords. Should be done with a data structure. */
1464 if (STREQN (tokstart, "unsigned", 8))
1466 if (current_language->la_language == language_cplus
1467 && STREQN (tokstart, "template", 8))
1469 if (STREQN (tokstart, "volatile", 8))
1470 return VOLATILE_KEYWORD;
1473 if (STREQN (tokstart, "struct", 6))
1475 if (STREQN (tokstart, "signed", 6))
1476 return SIGNED_KEYWORD;
1477 if (STREQN (tokstart, "sizeof", 6))
1479 if (STREQN (tokstart, "double", 6))
1480 return DOUBLE_KEYWORD;
1483 if (current_language->la_language == language_cplus)
1485 if (STREQN (tokstart, "false", 5))
1486 return FALSEKEYWORD;
1487 if (STREQN (tokstart, "class", 5))
1490 if (STREQN (tokstart, "union", 5))
1492 if (STREQN (tokstart, "short", 5))
1494 if (STREQN (tokstart, "const", 5))
1495 return CONST_KEYWORD;
1498 if (STREQN (tokstart, "enum", 4))
1500 if (STREQN (tokstart, "long", 4))
1502 if (current_language->la_language == language_cplus)
1504 if (STREQN (tokstart, "true", 4))
1507 if (STREQN (tokstart, "this", 4))
1509 static const char this_name[] =
1510 { CPLUS_MARKER, 't', 'h', 'i', 's', '\0' };
1512 if (lookup_symbol (this_name, expression_context_block,
1513 VAR_NAMESPACE, (int *) NULL,
1514 (struct symtab **) NULL))
1520 if (STREQN (tokstart, "int", 3))
1527 yylval.sval.ptr = tokstart;
1528 yylval.sval.length = namelen;
1530 if (*tokstart == '$')
1532 write_dollar_variable (yylval.sval);
1536 /* Look ahead and see if we can consume more of the input
1537 string to get a reasonable class/namespace spec or a
1538 fully-qualified name. This is a kludge to get around the
1539 HP aCC compiler's generation of symbol names with embedded
1540 colons for namespace and nested classes. */
1543 /* Only do it if not inside single quotes */
1544 sym_class = parse_nested_classes_for_hpacc (yylval.sval.ptr, yylval.sval.length,
1545 &token_string, &class_prefix, &lexptr);
1548 /* Replace the current token with the bigger one we found */
1549 yylval.sval.ptr = token_string;
1550 yylval.sval.length = strlen (token_string);
1554 /* Use token-type BLOCKNAME for symbols that happen to be defined as
1555 functions or symtabs. If this is not so, then ...
1556 Use token-type TYPENAME for symbols that happen to be defined
1557 currently as names of types; NAME for other symbols.
1558 The caller is not constrained to care about the distinction. */
1560 char *tmp = copy_name (yylval.sval);
1562 int is_a_field_of_this = 0;
1565 sym = lookup_symbol (tmp, expression_context_block,
1567 current_language->la_language == language_cplus
1568 ? &is_a_field_of_this : (int *) NULL,
1569 (struct symtab **) NULL);
1570 /* Call lookup_symtab, not lookup_partial_symtab, in case there are
1571 no psymtabs (coff, xcoff, or some future change to blow away the
1572 psymtabs once once symbols are read). */
1573 if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
1575 yylval.ssym.sym = sym;
1576 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1580 { /* See if it's a file name. */
1581 struct symtab *symtab;
1583 symtab = lookup_symtab (tmp);
1587 yylval.bval = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), STATIC_BLOCK);
1592 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1595 /* Despite the following flaw, we need to keep this code enabled.
1596 Because we can get called from check_stub_method, if we don't
1597 handle nested types then it screws many operations in any
1598 program which uses nested types. */
1599 /* In "A::x", if x is a member function of A and there happens
1600 to be a type (nested or not, since the stabs don't make that
1601 distinction) named x, then this code incorrectly thinks we
1602 are dealing with nested types rather than a member function. */
1606 struct symbol *best_sym;
1608 /* Look ahead to detect nested types. This probably should be
1609 done in the grammar, but trying seemed to introduce a lot
1610 of shift/reduce and reduce/reduce conflicts. It's possible
1611 that it could be done, though. Or perhaps a non-grammar, but
1612 less ad hoc, approach would work well. */
1614 /* Since we do not currently have any way of distinguishing
1615 a nested type from a non-nested one (the stabs don't tell
1616 us whether a type is nested), we just ignore the
1623 /* Skip whitespace. */
1624 while (*p == ' ' || *p == '\t' || *p == '\n')
1626 if (*p == ':' && p[1] == ':')
1628 /* Skip the `::'. */
1630 /* Skip whitespace. */
1631 while (*p == ' ' || *p == '\t' || *p == '\n')
1634 while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1635 || (*p >= 'a' && *p <= 'z')
1636 || (*p >= 'A' && *p <= 'Z'))
1640 struct symbol *cur_sym;
1641 /* As big as the whole rest of the expression, which is
1642 at least big enough. */
1643 char *ncopy = alloca (strlen (tmp)+strlen (namestart)+3);
1647 memcpy (tmp1, tmp, strlen (tmp));
1648 tmp1 += strlen (tmp);
1649 memcpy (tmp1, "::", 2);
1651 memcpy (tmp1, namestart, p - namestart);
1652 tmp1[p - namestart] = '\0';
1653 cur_sym = lookup_symbol (ncopy, expression_context_block,
1654 VAR_NAMESPACE, (int *) NULL,
1655 (struct symtab **) NULL);
1658 if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1676 yylval.tsym.type = SYMBOL_TYPE (best_sym);
1678 yylval.tsym.type = SYMBOL_TYPE (sym);
1682 if ((yylval.tsym.type = lookup_primitive_typename (tmp)) != 0)
1685 /* Input names that aren't symbols but ARE valid hex numbers,
1686 when the input radix permits them, can be names or numbers
1687 depending on the parse. Note we support radixes > 16 here. */
1689 ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1690 (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1692 YYSTYPE newlval; /* Its value is ignored. */
1693 hextype = parse_number (tokstart, namelen, 0, &newlval);
1696 yylval.ssym.sym = sym;
1697 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1702 /* Any other kind of symbol */
1703 yylval.ssym.sym = sym;
1704 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1713 error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);