1 /* YACC parser for Pascal expressions, for GDB.
2 Copyright (C) 2000-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* This file is derived from c-exp.y */
21 /* Parse a Pascal 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. */
38 /* Known bugs or limitations:
39 - pascal string operations are not supported at all.
40 - there are some problems with boolean types.
41 - Pascal type hexadecimal constants are not supported
42 because they conflict with the internal variables format.
43 Probably also lots of other problems, less well defined PM. */
48 #include "expression.h"
50 #include "parser-defs.h"
53 #include "bfd.h" /* Required by objfiles.h. */
54 #include "symfile.h" /* Required by objfiles.h. */
55 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols. */
57 #include "completer.h"
59 #define parse_type(ps) builtin_type (parse_gdbarch (ps))
61 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
63 #define GDB_YY_REMAP_PREFIX pascal_
66 /* The state of the parser, used internally when we are parsing the
69 static struct parser_state *pstate = NULL;
73 static int yylex (void);
75 void yyerror (const char *);
77 static char *uptok (const char *, int);
80 /* Although the yacc "value" of an expression is not used,
81 since the result is stored in the structure being created,
82 other node types do have values. */
101 const struct block *bval;
102 enum exp_opcode opcode;
103 struct internalvar *ivar;
110 /* YYSTYPE gets defined by %union */
111 static int parse_number (struct parser_state *,
112 const char *, int, int, YYSTYPE *);
114 static struct type *current_type;
115 static struct internalvar *intvar;
116 static int leftdiv_is_integer;
117 static void push_current_type (void);
118 static void pop_current_type (void);
119 static int search_field;
122 %type <voidval> exp exp1 type_exp start normal_start variable qualified_name
123 %type <tval> type typebase
124 /* %type <bval> block */
126 /* Fancy type parsing. */
129 %token <typed_val_int> INT
130 %token <typed_val_float> FLOAT
132 /* Both NAME and TYPENAME tokens represent symbols in the input,
133 and both convey their data as strings.
134 But a TYPENAME is a string that happens to be defined as a typedef
135 or builtin type name (such as int or char)
136 and a NAME is any other symbol.
137 Contexts where this distinction is not important can use the
138 nonterminal "name", which matches either NAME or TYPENAME. */
141 %token <sval> FIELDNAME
142 %token <voidval> COMPLETE
143 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
144 %token <tsym> TYPENAME
146 %type <ssym> name_not_typename
148 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
149 but which would parse as a valid number in the current input radix.
150 E.g. "c" when input_radix==16. Depending on the parse, it will be
151 turned into a name or into a number. */
153 %token <ssym> NAME_OR_INT
155 %token STRUCT CLASS SIZEOF COLONCOLON
158 /* Special type cases, put in to allow the parser to distinguish different
161 %token <voidval> VARIABLE
166 %token <lval> TRUEKEYWORD FALSEKEYWORD
176 %left '<' '>' LEQ GEQ
177 %left LSH RSH DIV MOD
181 %right UNARY INCREMENT DECREMENT
182 %right ARROW '.' '[' '('
184 %token <ssym> BLOCKNAME
191 start : { current_type = NULL;
194 leftdiv_is_integer = 0;
205 { write_exp_elt_opcode (pstate, OP_TYPE);
206 write_exp_elt_type (pstate, $1);
207 write_exp_elt_opcode (pstate, OP_TYPE);
208 current_type = $1; } ;
210 /* Expressions, including the comma operator. */
213 { write_exp_elt_opcode (pstate, BINOP_COMMA); }
216 /* Expressions, not including the comma operator. */
217 exp : exp '^' %prec UNARY
218 { write_exp_elt_opcode (pstate, UNOP_IND);
220 current_type = TYPE_TARGET_TYPE (current_type); }
223 exp : '@' exp %prec UNARY
224 { write_exp_elt_opcode (pstate, UNOP_ADDR);
226 current_type = TYPE_POINTER_TYPE (current_type); }
229 exp : '-' exp %prec UNARY
230 { write_exp_elt_opcode (pstate, UNOP_NEG); }
233 exp : NOT exp %prec UNARY
234 { write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
237 exp : INCREMENT '(' exp ')' %prec UNARY
238 { write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
241 exp : DECREMENT '(' exp ')' %prec UNARY
242 { write_exp_elt_opcode (pstate, UNOP_PREDECREMENT); }
246 field_exp : exp '.' %prec UNARY
247 { search_field = 1; }
250 exp : field_exp FIELDNAME
251 { write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
252 write_exp_string (pstate, $2);
253 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
257 while (TYPE_CODE (current_type)
260 TYPE_TARGET_TYPE (current_type);
261 current_type = lookup_struct_elt_type (
262 current_type, $2.ptr, 0);
269 { write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
270 write_exp_string (pstate, $2);
271 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
275 while (TYPE_CODE (current_type)
278 TYPE_TARGET_TYPE (current_type);
279 current_type = lookup_struct_elt_type (
280 current_type, $2.ptr, 0);
284 exp : field_exp name COMPLETE
285 { mark_struct_expression (pstate);
286 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
287 write_exp_string (pstate, $2);
288 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
290 exp : field_exp COMPLETE
292 mark_struct_expression (pstate);
293 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
296 write_exp_string (pstate, s);
297 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
301 /* We need to save the current_type value. */
302 { const char *arrayname;
304 arrayfieldindex = is_pascal_string_type (
305 current_type, NULL, NULL,
306 NULL, NULL, &arrayname);
309 struct stoken stringsval;
312 buf = (char *) alloca (strlen (arrayname) + 1);
313 stringsval.ptr = buf;
314 stringsval.length = strlen (arrayname);
315 strcpy (buf, arrayname);
316 current_type = TYPE_FIELD_TYPE (current_type,
317 arrayfieldindex - 1);
318 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
319 write_exp_string (pstate, stringsval);
320 write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
322 push_current_type (); }
324 { pop_current_type ();
325 write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT);
327 current_type = TYPE_TARGET_TYPE (current_type); }
331 /* This is to save the value of arglist_len
332 being accumulated by an outer function call. */
333 { push_current_type ();
335 arglist ')' %prec ARROW
336 { write_exp_elt_opcode (pstate, OP_FUNCALL);
337 write_exp_elt_longcst (pstate,
338 (LONGEST) end_arglist ());
339 write_exp_elt_opcode (pstate, OP_FUNCALL);
342 current_type = TYPE_TARGET_TYPE (current_type);
349 | arglist ',' exp %prec ABOVE_COMMA
353 exp : type '(' exp ')' %prec UNARY
356 /* Allow automatic dereference of classes. */
357 if ((TYPE_CODE (current_type) == TYPE_CODE_PTR)
358 && (TYPE_CODE (TYPE_TARGET_TYPE (current_type)) == TYPE_CODE_STRUCT)
359 && (TYPE_CODE ($1) == TYPE_CODE_STRUCT))
360 write_exp_elt_opcode (pstate, UNOP_IND);
362 write_exp_elt_opcode (pstate, UNOP_CAST);
363 write_exp_elt_type (pstate, $1);
364 write_exp_elt_opcode (pstate, UNOP_CAST);
372 /* Binary operators in order of decreasing precedence. */
375 { write_exp_elt_opcode (pstate, BINOP_MUL); }
379 if (current_type && is_integral_type (current_type))
380 leftdiv_is_integer = 1;
384 if (leftdiv_is_integer && current_type
385 && is_integral_type (current_type))
387 write_exp_elt_opcode (pstate, UNOP_CAST);
388 write_exp_elt_type (pstate,
390 ->builtin_long_double);
392 = parse_type (pstate)->builtin_long_double;
393 write_exp_elt_opcode (pstate, UNOP_CAST);
394 leftdiv_is_integer = 0;
397 write_exp_elt_opcode (pstate, BINOP_DIV);
402 { write_exp_elt_opcode (pstate, BINOP_INTDIV); }
406 { write_exp_elt_opcode (pstate, BINOP_REM); }
410 { write_exp_elt_opcode (pstate, BINOP_ADD); }
414 { write_exp_elt_opcode (pstate, BINOP_SUB); }
418 { write_exp_elt_opcode (pstate, BINOP_LSH); }
422 { write_exp_elt_opcode (pstate, BINOP_RSH); }
426 { write_exp_elt_opcode (pstate, BINOP_EQUAL);
427 current_type = parse_type (pstate)->builtin_bool;
431 exp : exp NOTEQUAL exp
432 { write_exp_elt_opcode (pstate, BINOP_NOTEQUAL);
433 current_type = parse_type (pstate)->builtin_bool;
438 { write_exp_elt_opcode (pstate, BINOP_LEQ);
439 current_type = parse_type (pstate)->builtin_bool;
444 { write_exp_elt_opcode (pstate, BINOP_GEQ);
445 current_type = parse_type (pstate)->builtin_bool;
450 { write_exp_elt_opcode (pstate, BINOP_LESS);
451 current_type = parse_type (pstate)->builtin_bool;
456 { write_exp_elt_opcode (pstate, BINOP_GTR);
457 current_type = parse_type (pstate)->builtin_bool;
462 { write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
466 { write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
470 { write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
474 { write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
478 { write_exp_elt_opcode (pstate, OP_BOOL);
479 write_exp_elt_longcst (pstate, (LONGEST) $1);
480 current_type = parse_type (pstate)->builtin_bool;
481 write_exp_elt_opcode (pstate, OP_BOOL); }
485 { write_exp_elt_opcode (pstate, OP_BOOL);
486 write_exp_elt_longcst (pstate, (LONGEST) $1);
487 current_type = parse_type (pstate)->builtin_bool;
488 write_exp_elt_opcode (pstate, OP_BOOL); }
492 { write_exp_elt_opcode (pstate, OP_LONG);
493 write_exp_elt_type (pstate, $1.type);
494 current_type = $1.type;
495 write_exp_elt_longcst (pstate, (LONGEST)($1.val));
496 write_exp_elt_opcode (pstate, OP_LONG); }
501 parse_number (pstate, $1.stoken.ptr,
502 $1.stoken.length, 0, &val);
503 write_exp_elt_opcode (pstate, OP_LONG);
504 write_exp_elt_type (pstate, val.typed_val_int.type);
505 current_type = val.typed_val_int.type;
506 write_exp_elt_longcst (pstate, (LONGEST)
507 val.typed_val_int.val);
508 write_exp_elt_opcode (pstate, OP_LONG);
514 { write_exp_elt_opcode (pstate, OP_FLOAT);
515 write_exp_elt_type (pstate, $1.type);
516 current_type = $1.type;
517 write_exp_elt_floatcst (pstate, $1.val);
518 write_exp_elt_opcode (pstate, OP_FLOAT); }
525 /* Already written by write_dollar_variable.
526 Handle current_type. */
528 struct value * val, * mark;
530 mark = value_mark ();
531 val = value_of_internalvar (parse_gdbarch (pstate),
533 current_type = value_type (val);
534 value_release_to_mark (mark);
539 exp : SIZEOF '(' type ')' %prec UNARY
540 { write_exp_elt_opcode (pstate, OP_LONG);
541 write_exp_elt_type (pstate,
542 parse_type (pstate)->builtin_int);
543 current_type = parse_type (pstate)->builtin_int;
544 $3 = check_typedef ($3);
545 write_exp_elt_longcst (pstate,
546 (LONGEST) TYPE_LENGTH ($3));
547 write_exp_elt_opcode (pstate, OP_LONG); }
550 exp : SIZEOF '(' exp ')' %prec UNARY
551 { write_exp_elt_opcode (pstate, UNOP_SIZEOF);
552 current_type = parse_type (pstate)->builtin_int; }
555 { /* C strings are converted into array constants with
556 an explicit null byte added at the end. Thus
557 the array upper bound is the string length.
558 There is no such thing in C as a completely empty
560 const char *sp = $1.ptr; int count = $1.length;
564 write_exp_elt_opcode (pstate, OP_LONG);
565 write_exp_elt_type (pstate,
568 write_exp_elt_longcst (pstate,
570 write_exp_elt_opcode (pstate, OP_LONG);
572 write_exp_elt_opcode (pstate, OP_LONG);
573 write_exp_elt_type (pstate,
576 write_exp_elt_longcst (pstate, (LONGEST)'\0');
577 write_exp_elt_opcode (pstate, OP_LONG);
578 write_exp_elt_opcode (pstate, OP_ARRAY);
579 write_exp_elt_longcst (pstate, (LONGEST) 0);
580 write_exp_elt_longcst (pstate,
581 (LONGEST) ($1.length));
582 write_exp_elt_opcode (pstate, OP_ARRAY); }
588 struct value * this_val;
589 struct type * this_type;
590 write_exp_elt_opcode (pstate, OP_THIS);
591 write_exp_elt_opcode (pstate, OP_THIS);
592 /* We need type of this. */
594 = value_of_this_silent (parse_language (pstate));
596 this_type = value_type (this_val);
601 if (TYPE_CODE (this_type) == TYPE_CODE_PTR)
603 this_type = TYPE_TARGET_TYPE (this_type);
604 write_exp_elt_opcode (pstate, UNOP_IND);
608 current_type = this_type;
612 /* end of object pascal. */
616 if ($1.sym.symbol != 0)
617 $$ = SYMBOL_BLOCK_VALUE ($1.sym.symbol);
621 lookup_symtab (copy_name ($1.stoken));
623 $$ = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (tem),
626 error (_("No file or function \"%s\"."),
627 copy_name ($1.stoken));
632 block : block COLONCOLON name
634 = lookup_symbol (copy_name ($3), $1,
635 VAR_DOMAIN, NULL).symbol;
637 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
638 error (_("No function \"%s\" in specified context."),
640 $$ = SYMBOL_BLOCK_VALUE (tem); }
643 variable: block COLONCOLON name
644 { struct block_symbol sym;
646 sym = lookup_symbol (copy_name ($3), $1,
649 error (_("No symbol \"%s\" in specified context."),
652 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
653 write_exp_elt_block (pstate, sym.block);
654 write_exp_elt_sym (pstate, sym.symbol);
655 write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
658 qualified_name: typebase COLONCOLON name
660 struct type *type = $1;
662 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
663 && TYPE_CODE (type) != TYPE_CODE_UNION)
664 error (_("`%s' is not defined as an aggregate type."),
667 write_exp_elt_opcode (pstate, OP_SCOPE);
668 write_exp_elt_type (pstate, type);
669 write_exp_string (pstate, $3);
670 write_exp_elt_opcode (pstate, OP_SCOPE);
674 variable: qualified_name
677 char *name = copy_name ($2);
679 struct bound_minimal_symbol msymbol;
682 lookup_symbol (name, (const struct block *) NULL,
683 VAR_DOMAIN, NULL).symbol;
686 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
687 write_exp_elt_block (pstate, NULL);
688 write_exp_elt_sym (pstate, sym);
689 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
693 msymbol = lookup_bound_minimal_symbol (name);
694 if (msymbol.minsym != NULL)
695 write_exp_msymbol (pstate, msymbol);
696 else if (!have_full_symbols ()
697 && !have_partial_symbols ())
698 error (_("No symbol table is loaded. "
699 "Use the \"file\" command."));
701 error (_("No symbol \"%s\" in current context."),
706 variable: name_not_typename
707 { struct block_symbol sym = $1.sym;
711 if (symbol_read_needs_frame (sym.symbol))
713 if (innermost_block == 0
714 || contained_in (sym.block,
716 innermost_block = sym.block;
719 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
720 write_exp_elt_block (pstate, sym.block);
721 write_exp_elt_sym (pstate, sym.symbol);
722 write_exp_elt_opcode (pstate, OP_VAR_VALUE);
723 current_type = sym.symbol->type; }
724 else if ($1.is_a_field_of_this)
726 struct value * this_val;
727 struct type * this_type;
728 /* Object pascal: it hangs off of `this'. Must
729 not inadvertently convert from a method call
731 if (innermost_block == 0
732 || contained_in (sym.block,
734 innermost_block = sym.block;
735 write_exp_elt_opcode (pstate, OP_THIS);
736 write_exp_elt_opcode (pstate, OP_THIS);
737 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
738 write_exp_string (pstate, $1.stoken);
739 write_exp_elt_opcode (pstate, STRUCTOP_PTR);
740 /* We need type of this. */
742 = value_of_this_silent (parse_language (pstate));
744 this_type = value_type (this_val);
748 current_type = lookup_struct_elt_type (
750 copy_name ($1.stoken), 0);
756 struct bound_minimal_symbol msymbol;
757 char *arg = copy_name ($1.stoken);
760 lookup_bound_minimal_symbol (arg);
761 if (msymbol.minsym != NULL)
762 write_exp_msymbol (pstate, msymbol);
763 else if (!have_full_symbols ()
764 && !have_partial_symbols ())
765 error (_("No symbol table is loaded. "
766 "Use the \"file\" command."));
768 error (_("No symbol \"%s\" in current context."),
769 copy_name ($1.stoken));
778 /* We used to try to recognize more pointer to member types here, but
779 that didn't work (shift/reduce conflicts meant that these rules never
780 got executed). The problem is that
781 int (foo::bar::baz::bizzle)
782 is a function type but
783 int (foo::bar::baz::bizzle::*)
784 is a pointer to member type. Stroustrup loses again! */
789 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
791 { $$ = lookup_pointer_type ($2); }
795 { $$ = lookup_struct (copy_name ($2),
796 expression_context_block); }
798 { $$ = lookup_struct (copy_name ($2),
799 expression_context_block); }
800 /* "const" and "volatile" are curently ignored. A type qualifier
801 after the type is handled in the ptype rule. I think these could
805 name : NAME { $$ = $1.stoken; }
806 | BLOCKNAME { $$ = $1.stoken; }
807 | TYPENAME { $$ = $1.stoken; }
808 | NAME_OR_INT { $$ = $1.stoken; }
811 name_not_typename : NAME
813 /* These would be useful if name_not_typename was useful, but it is just
814 a fake for "variable", so these cause reduce/reduce conflicts because
815 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
816 =exp) or just an exp. If name_not_typename was ever used in an lvalue
817 context where only a name could occur, this might be useful.
824 /* Take care of parsing a number (anything that starts with a digit).
825 Set yylval and return the token type; update lexptr.
826 LEN is the number of characters in it. */
828 /*** Needs some error checking for the float case ***/
831 parse_number (struct parser_state *par_state,
832 const char *p, int len, int parsed_float, YYSTYPE *putithere)
834 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
835 here, and we do kind of silly things like cast to unsigned. */
842 int base = input_radix;
845 /* Number of "L" suffixes encountered. */
848 /* We have found a "L" or "U" suffix. */
849 int found_suffix = 0;
852 struct type *signed_type;
853 struct type *unsigned_type;
857 /* Handle suffixes: 'f' for float, 'l' for long double.
858 FIXME: This appears to be an extension -- do we want this? */
859 if (len >= 1 && tolower (p[len - 1]) == 'f')
861 putithere->typed_val_float.type
862 = parse_type (par_state)->builtin_float;
865 else if (len >= 1 && tolower (p[len - 1]) == 'l')
867 putithere->typed_val_float.type
868 = parse_type (par_state)->builtin_long_double;
871 /* Default type for floating-point literals is double. */
874 putithere->typed_val_float.type
875 = parse_type (par_state)->builtin_double;
878 if (!parse_float (p, len,
879 putithere->typed_val_float.type,
880 putithere->typed_val_float.val))
885 /* Handle base-switching prefixes 0x, 0t, 0d, 0. */
919 if (c >= 'A' && c <= 'Z')
921 if (c != 'l' && c != 'u')
923 if (c >= '0' && c <= '9')
931 if (base > 10 && c >= 'a' && c <= 'f')
935 n += i = c - 'a' + 10;
948 return ERROR; /* Char not a digit */
951 return ERROR; /* Invalid digit in this base. */
953 /* Portably test for overflow (only works for nonzero values, so make
954 a second check for zero). FIXME: Can't we just make n and prevn
955 unsigned and avoid this? */
956 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
957 unsigned_p = 1; /* Try something unsigned. */
959 /* Portably test for unsigned overflow.
960 FIXME: This check is wrong; for example it doesn't find overflow
961 on 0x123456789 when LONGEST is 32 bits. */
962 if (c != 'l' && c != 'u' && n != 0)
964 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
965 error (_("Numeric constant too large."));
970 /* An integer constant is an int, a long, or a long long. An L
971 suffix forces it to be long; an LL suffix forces it to be long
972 long. If not forced to a larger size, it gets the first type of
973 the above that it fits in. To figure out whether it fits, we
974 shift it right and see whether anything remains. Note that we
975 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
976 operation, because many compilers will warn about such a shift
977 (which always produces a zero result). Sometimes gdbarch_int_bit
978 or gdbarch_long_bit will be that big, sometimes not. To deal with
979 the case where it is we just always shift the value more than
980 once, with fewer bits each time. */
982 un = (ULONGEST)n >> 2;
984 && (un >> (gdbarch_int_bit (parse_gdbarch (par_state)) - 2)) == 0)
987 = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch (par_state)) - 1);
989 /* A large decimal (not hex or octal) constant (between INT_MAX
990 and UINT_MAX) is a long or unsigned long, according to ANSI,
991 never an unsigned int, but this code treats it as unsigned
992 int. This probably should be fixed. GCC gives a warning on
995 unsigned_type = parse_type (par_state)->builtin_unsigned_int;
996 signed_type = parse_type (par_state)->builtin_int;
999 && (un >> (gdbarch_long_bit (parse_gdbarch (par_state)) - 2)) == 0)
1002 = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch (par_state)) - 1);
1003 unsigned_type = parse_type (par_state)->builtin_unsigned_long;
1004 signed_type = parse_type (par_state)->builtin_long;
1009 if (sizeof (ULONGEST) * HOST_CHAR_BIT
1010 < gdbarch_long_long_bit (parse_gdbarch (par_state)))
1011 /* A long long does not fit in a LONGEST. */
1012 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
1014 shift = (gdbarch_long_long_bit (parse_gdbarch (par_state)) - 1);
1015 high_bit = (ULONGEST) 1 << shift;
1016 unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
1017 signed_type = parse_type (par_state)->builtin_long_long;
1020 putithere->typed_val_int.val = n;
1022 /* If the high bit of the worked out type is set then this number
1023 has to be unsigned. */
1025 if (unsigned_p || (n & high_bit))
1027 putithere->typed_val_int.type = unsigned_type;
1031 putithere->typed_val_int.type = signed_type;
1040 struct type *stored;
1041 struct type_push *next;
1044 static struct type_push *tp_top = NULL;
1047 push_current_type (void)
1049 struct type_push *tpnew;
1050 tpnew = (struct type_push *) malloc (sizeof (struct type_push));
1051 tpnew->next = tp_top;
1052 tpnew->stored = current_type;
1053 current_type = NULL;
1058 pop_current_type (void)
1060 struct type_push *tp = tp_top;
1063 current_type = tp->stored;
1073 enum exp_opcode opcode;
1076 static const struct token tokentab3[] =
1078 {"shr", RSH, BINOP_END},
1079 {"shl", LSH, BINOP_END},
1080 {"and", ANDAND, BINOP_END},
1081 {"div", DIV, BINOP_END},
1082 {"not", NOT, BINOP_END},
1083 {"mod", MOD, BINOP_END},
1084 {"inc", INCREMENT, BINOP_END},
1085 {"dec", DECREMENT, BINOP_END},
1086 {"xor", XOR, BINOP_END}
1089 static const struct token tokentab2[] =
1091 {"or", OR, BINOP_END},
1092 {"<>", NOTEQUAL, BINOP_END},
1093 {"<=", LEQ, BINOP_END},
1094 {">=", GEQ, BINOP_END},
1095 {":=", ASSIGN, BINOP_END},
1096 {"::", COLONCOLON, BINOP_END} };
1098 /* Allocate uppercased var: */
1099 /* make an uppercased copy of tokstart. */
1101 uptok (const char *tokstart, int namelen)
1104 char *uptokstart = (char *)malloc(namelen+1);
1105 for (i = 0;i <= namelen;i++)
1107 if ((tokstart[i]>='a' && tokstart[i]<='z'))
1108 uptokstart[i] = tokstart[i]-('a'-'A');
1110 uptokstart[i] = tokstart[i];
1112 uptokstart[namelen]='\0';
1116 /* Read one token, getting characters through lexptr. */
1124 const char *tokstart;
1127 int explen, tempbufindex;
1128 static char *tempbuf;
1129 static int tempbufsize;
1133 prev_lexptr = lexptr;
1136 explen = strlen (lexptr);
1138 /* See if it is a special token of length 3. */
1140 for (i = 0; i < sizeof (tokentab3) / sizeof (tokentab3[0]); i++)
1141 if (strncasecmp (tokstart, tokentab3[i].oper, 3) == 0
1142 && (!isalpha (tokentab3[i].oper[0]) || explen == 3
1143 || (!isalpha (tokstart[3])
1144 && !isdigit (tokstart[3]) && tokstart[3] != '_')))
1147 yylval.opcode = tokentab3[i].opcode;
1148 return tokentab3[i].token;
1151 /* See if it is a special token of length 2. */
1153 for (i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++)
1154 if (strncasecmp (tokstart, tokentab2[i].oper, 2) == 0
1155 && (!isalpha (tokentab2[i].oper[0]) || explen == 2
1156 || (!isalpha (tokstart[2])
1157 && !isdigit (tokstart[2]) && tokstart[2] != '_')))
1160 yylval.opcode = tokentab2[i].opcode;
1161 return tokentab2[i].token;
1164 switch (c = *tokstart)
1167 if (search_field && parse_completion)
1179 /* We either have a character constant ('0' or '\177' for example)
1180 or we have a quoted symbol reference ('foo(int,int)' in object pascal
1185 c = parse_escape (parse_gdbarch (pstate), &lexptr);
1187 error (_("Empty character constant."));
1189 yylval.typed_val_int.val = c;
1190 yylval.typed_val_int.type = parse_type (pstate)->builtin_char;
1195 namelen = skip_quoted (tokstart) - tokstart;
1198 lexptr = tokstart + namelen;
1199 if (lexptr[-1] != '\'')
1200 error (_("Unmatched single quote."));
1203 uptokstart = uptok(tokstart,namelen);
1206 error (_("Invalid character constant."));
1216 if (paren_depth == 0)
1223 if (comma_terminates && paren_depth == 0)
1229 /* Might be a floating point number. */
1230 if (lexptr[1] < '0' || lexptr[1] > '9')
1232 goto symbol; /* Nope, must be a symbol. */
1235 /* FALL THRU into number case. */
1248 /* It's a number. */
1249 int got_dot = 0, got_e = 0, toktype;
1250 const char *p = tokstart;
1251 int hex = input_radix > 10;
1253 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1258 else if (c == '0' && (p[1]=='t' || p[1]=='T'
1259 || p[1]=='d' || p[1]=='D'))
1267 /* This test includes !hex because 'e' is a valid hex digit
1268 and thus does not indicate a floating point number when
1269 the radix is hex. */
1270 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1271 got_dot = got_e = 1;
1272 /* This test does not include !hex, because a '.' always indicates
1273 a decimal floating point number regardless of the radix. */
1274 else if (!got_dot && *p == '.')
1276 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1277 && (*p == '-' || *p == '+'))
1278 /* This is the sign of the exponent, not the end of the
1281 /* We will take any letters or digits. parse_number will
1282 complain if past the radix, or if L or U are not final. */
1283 else if ((*p < '0' || *p > '9')
1284 && ((*p < 'a' || *p > 'z')
1285 && (*p < 'A' || *p > 'Z')))
1288 toktype = parse_number (pstate, tokstart,
1289 p - tokstart, got_dot | got_e, &yylval);
1290 if (toktype == ERROR)
1292 char *err_copy = (char *) alloca (p - tokstart + 1);
1294 memcpy (err_copy, tokstart, p - tokstart);
1295 err_copy[p - tokstart] = 0;
1296 error (_("Invalid number \"%s\"."), err_copy);
1327 /* Build the gdb internal form of the input string in tempbuf,
1328 translating any standard C escape forms seen. Note that the
1329 buffer is null byte terminated *only* for the convenience of
1330 debugging gdb itself and printing the buffer contents when
1331 the buffer contains no embedded nulls. Gdb does not depend
1332 upon the buffer being null byte terminated, it uses the length
1333 string instead. This allows gdb to handle C strings (as well
1334 as strings in other languages) with embedded null bytes. */
1336 tokptr = ++tokstart;
1340 /* Grow the static temp buffer if necessary, including allocating
1341 the first one on demand. */
1342 if (tempbufindex + 1 >= tempbufsize)
1344 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1351 /* Do nothing, loop will terminate. */
1355 c = parse_escape (parse_gdbarch (pstate), &tokptr);
1360 tempbuf[tempbufindex++] = c;
1363 tempbuf[tempbufindex++] = *tokptr++;
1366 } while ((*tokptr != '"') && (*tokptr != '\0'));
1367 if (*tokptr++ != '"')
1369 error (_("Unterminated string in expression."));
1371 tempbuf[tempbufindex] = '\0'; /* See note above. */
1372 yylval.sval.ptr = tempbuf;
1373 yylval.sval.length = tempbufindex;
1378 if (!(c == '_' || c == '$'
1379 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1380 /* We must have come across a bad character (e.g. ';'). */
1381 error (_("Invalid character '%c' in expression."), c);
1383 /* It's a name. See how long it is. */
1385 for (c = tokstart[namelen];
1386 (c == '_' || c == '$' || (c >= '0' && c <= '9')
1387 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1389 /* Template parameter lists are part of the name.
1390 FIXME: This mishandles `print $a<4&&$a>3'. */
1394 int nesting_level = 1;
1395 while (tokstart[++i])
1397 if (tokstart[i] == '<')
1399 else if (tokstart[i] == '>')
1401 if (--nesting_level == 0)
1405 if (tokstart[i] == '>')
1411 /* do NOT uppercase internals because of registers !!! */
1412 c = tokstart[++namelen];
1415 uptokstart = uptok(tokstart,namelen);
1417 /* The token "if" terminates the expression and is NOT
1418 removed from the input stream. */
1419 if (namelen == 2 && uptokstart[0] == 'I' && uptokstart[1] == 'F')
1429 /* Catch specific keywords. Should be done with a data structure. */
1433 if (strcmp (uptokstart, "OBJECT") == 0)
1438 if (strcmp (uptokstart, "RECORD") == 0)
1443 if (strcmp (uptokstart, "SIZEOF") == 0)
1450 if (strcmp (uptokstart, "CLASS") == 0)
1455 if (strcmp (uptokstart, "FALSE") == 0)
1459 return FALSEKEYWORD;
1463 if (strcmp (uptokstart, "TRUE") == 0)
1469 if (strcmp (uptokstart, "SELF") == 0)
1471 /* Here we search for 'this' like
1472 inserted in FPC stabs debug info. */
1473 static const char this_name[] = "this";
1475 if (lookup_symbol (this_name, expression_context_block,
1476 VAR_DOMAIN, NULL).symbol)
1487 yylval.sval.ptr = tokstart;
1488 yylval.sval.length = namelen;
1490 if (*tokstart == '$')
1494 /* $ is the normal prefix for pascal hexadecimal values
1495 but this conflicts with the GDB use for debugger variables
1496 so in expression to enter hexadecimal values
1497 we still need to use C syntax with 0xff */
1498 write_dollar_variable (pstate, yylval.sval);
1499 tmp = (char *) alloca (namelen + 1);
1500 memcpy (tmp, tokstart, namelen);
1501 tmp[namelen] = '\0';
1502 intvar = lookup_only_internalvar (tmp + 1);
1507 /* Use token-type BLOCKNAME for symbols that happen to be defined as
1508 functions or symtabs. If this is not so, then ...
1509 Use token-type TYPENAME for symbols that happen to be defined
1510 currently as names of types; NAME for other symbols.
1511 The caller is not constrained to care about the distinction. */
1513 char *tmp = copy_name (yylval.sval);
1515 struct field_of_this_result is_a_field_of_this;
1519 is_a_field_of_this.type = NULL;
1520 if (search_field && current_type)
1521 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1525 sym = lookup_symbol (tmp, expression_context_block,
1526 VAR_DOMAIN, &is_a_field_of_this).symbol;
1527 /* second chance uppercased (as Free Pascal does). */
1528 if (!sym && is_a_field_of_this.type == NULL && !is_a_field)
1530 for (i = 0; i <= namelen; i++)
1532 if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1533 tmp[i] -= ('a'-'A');
1535 if (search_field && current_type)
1536 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1540 sym = lookup_symbol (tmp, expression_context_block,
1541 VAR_DOMAIN, &is_a_field_of_this).symbol;
1543 /* Third chance Capitalized (as GPC does). */
1544 if (!sym && is_a_field_of_this.type == NULL && !is_a_field)
1546 for (i = 0; i <= namelen; i++)
1550 if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1551 tmp[i] -= ('a'-'A');
1554 if ((tmp[i] >= 'A' && tmp[i] <= 'Z'))
1555 tmp[i] -= ('A'-'a');
1557 if (search_field && current_type)
1558 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1562 sym = lookup_symbol (tmp, expression_context_block,
1563 VAR_DOMAIN, &is_a_field_of_this).symbol;
1566 if (is_a_field || (is_a_field_of_this.type != NULL))
1568 tempbuf = (char *) realloc (tempbuf, namelen + 1);
1569 strncpy (tempbuf, tmp, namelen);
1570 tempbuf [namelen] = 0;
1571 yylval.sval.ptr = tempbuf;
1572 yylval.sval.length = namelen;
1573 yylval.ssym.sym.symbol = NULL;
1574 yylval.ssym.sym.block = NULL;
1576 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
1582 /* Call lookup_symtab, not lookup_partial_symtab, in case there are
1583 no psymtabs (coff, xcoff, or some future change to blow away the
1584 psymtabs once once symbols are read). */
1585 if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
1586 || lookup_symtab (tmp))
1588 yylval.ssym.sym.symbol = sym;
1589 yylval.ssym.sym.block = NULL;
1590 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
1594 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1597 /* Despite the following flaw, we need to keep this code enabled.
1598 Because we can get called from check_stub_method, if we don't
1599 handle nested types then it screws many operations in any
1600 program which uses nested types. */
1601 /* In "A::x", if x is a member function of A and there happens
1602 to be a type (nested or not, since the stabs don't make that
1603 distinction) named x, then this code incorrectly thinks we
1604 are dealing with nested types rather than a member function. */
1607 const char *namestart;
1608 struct symbol *best_sym;
1610 /* Look ahead to detect nested types. This probably should be
1611 done in the grammar, but trying seemed to introduce a lot
1612 of shift/reduce and reduce/reduce conflicts. It's possible
1613 that it could be done, though. Or perhaps a non-grammar, but
1614 less ad hoc, approach would work well. */
1616 /* Since we do not currently have any way of distinguishing
1617 a nested type from a non-nested one (the stabs don't tell
1618 us whether a type is nested), we just ignore the
1625 /* Skip whitespace. */
1626 while (*p == ' ' || *p == '\t' || *p == '\n')
1628 if (*p == ':' && p[1] == ':')
1630 /* Skip the `::'. */
1632 /* Skip whitespace. */
1633 while (*p == ' ' || *p == '\t' || *p == '\n')
1636 while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1637 || (*p >= 'a' && *p <= 'z')
1638 || (*p >= 'A' && *p <= 'Z'))
1642 struct symbol *cur_sym;
1643 /* As big as the whole rest of the expression, which is
1644 at least big enough. */
1646 = (char *) alloca (strlen (tmp) + strlen (namestart)
1651 memcpy (tmp1, tmp, strlen (tmp));
1652 tmp1 += strlen (tmp);
1653 memcpy (tmp1, "::", 2);
1655 memcpy (tmp1, namestart, p - namestart);
1656 tmp1[p - namestart] = '\0';
1657 cur_sym = lookup_symbol (ncopy, expression_context_block,
1658 VAR_DOMAIN, NULL).symbol;
1661 if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1679 yylval.tsym.type = SYMBOL_TYPE (best_sym);
1681 yylval.tsym.type = SYMBOL_TYPE (sym);
1687 = language_lookup_primitive_type (parse_language (pstate),
1688 parse_gdbarch (pstate), tmp);
1689 if (yylval.tsym.type != NULL)
1695 /* Input names that aren't symbols but ARE valid hex numbers,
1696 when the input radix permits them, can be names or numbers
1697 depending on the parse. Note we support radixes > 16 here. */
1699 && ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10)
1700 || (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1702 YYSTYPE newlval; /* Its value is ignored. */
1703 hextype = parse_number (pstate, tokstart, namelen, 0, &newlval);
1706 yylval.ssym.sym.symbol = sym;
1707 yylval.ssym.sym.block = NULL;
1708 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
1715 /* Any other kind of symbol. */
1716 yylval.ssym.sym.symbol = sym;
1717 yylval.ssym.sym.block = NULL;
1723 pascal_parse (struct parser_state *par_state)
1725 /* Setting up the parser state. */
1726 scoped_restore pstate_restore = make_scoped_restore (&pstate);
1727 gdb_assert (par_state != NULL);
1734 yyerror (const char *msg)
1737 lexptr = prev_lexptr;
1739 error (_("A %s in expression, near `%s'."), (msg ? msg : "error"), lexptr);