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_DOUBLE);
515 write_exp_elt_type (pstate, $1.type);
516 current_type = $1.type;
517 write_exp_elt_dblcst (pstate, $1.dval);
518 write_exp_elt_opcode (pstate, OP_DOUBLE); }
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 if (! parse_c_float (parse_gdbarch (par_state), p, len,
858 &putithere->typed_val_float.dval,
859 &putithere->typed_val_float.type))
864 /* Handle base-switching prefixes 0x, 0t, 0d, 0. */
898 if (c >= 'A' && c <= 'Z')
900 if (c != 'l' && c != 'u')
902 if (c >= '0' && c <= '9')
910 if (base > 10 && c >= 'a' && c <= 'f')
914 n += i = c - 'a' + 10;
927 return ERROR; /* Char not a digit */
930 return ERROR; /* Invalid digit in this base. */
932 /* Portably test for overflow (only works for nonzero values, so make
933 a second check for zero). FIXME: Can't we just make n and prevn
934 unsigned and avoid this? */
935 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
936 unsigned_p = 1; /* Try something unsigned. */
938 /* Portably test for unsigned overflow.
939 FIXME: This check is wrong; for example it doesn't find overflow
940 on 0x123456789 when LONGEST is 32 bits. */
941 if (c != 'l' && c != 'u' && n != 0)
943 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
944 error (_("Numeric constant too large."));
949 /* An integer constant is an int, a long, or a long long. An L
950 suffix forces it to be long; an LL suffix forces it to be long
951 long. If not forced to a larger size, it gets the first type of
952 the above that it fits in. To figure out whether it fits, we
953 shift it right and see whether anything remains. Note that we
954 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
955 operation, because many compilers will warn about such a shift
956 (which always produces a zero result). Sometimes gdbarch_int_bit
957 or gdbarch_long_bit will be that big, sometimes not. To deal with
958 the case where it is we just always shift the value more than
959 once, with fewer bits each time. */
961 un = (ULONGEST)n >> 2;
963 && (un >> (gdbarch_int_bit (parse_gdbarch (par_state)) - 2)) == 0)
966 = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch (par_state)) - 1);
968 /* A large decimal (not hex or octal) constant (between INT_MAX
969 and UINT_MAX) is a long or unsigned long, according to ANSI,
970 never an unsigned int, but this code treats it as unsigned
971 int. This probably should be fixed. GCC gives a warning on
974 unsigned_type = parse_type (par_state)->builtin_unsigned_int;
975 signed_type = parse_type (par_state)->builtin_int;
978 && (un >> (gdbarch_long_bit (parse_gdbarch (par_state)) - 2)) == 0)
981 = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch (par_state)) - 1);
982 unsigned_type = parse_type (par_state)->builtin_unsigned_long;
983 signed_type = parse_type (par_state)->builtin_long;
988 if (sizeof (ULONGEST) * HOST_CHAR_BIT
989 < gdbarch_long_long_bit (parse_gdbarch (par_state)))
990 /* A long long does not fit in a LONGEST. */
991 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
993 shift = (gdbarch_long_long_bit (parse_gdbarch (par_state)) - 1);
994 high_bit = (ULONGEST) 1 << shift;
995 unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
996 signed_type = parse_type (par_state)->builtin_long_long;
999 putithere->typed_val_int.val = n;
1001 /* If the high bit of the worked out type is set then this number
1002 has to be unsigned. */
1004 if (unsigned_p || (n & high_bit))
1006 putithere->typed_val_int.type = unsigned_type;
1010 putithere->typed_val_int.type = signed_type;
1019 struct type *stored;
1020 struct type_push *next;
1023 static struct type_push *tp_top = NULL;
1026 push_current_type (void)
1028 struct type_push *tpnew;
1029 tpnew = (struct type_push *) malloc (sizeof (struct type_push));
1030 tpnew->next = tp_top;
1031 tpnew->stored = current_type;
1032 current_type = NULL;
1037 pop_current_type (void)
1039 struct type_push *tp = tp_top;
1042 current_type = tp->stored;
1052 enum exp_opcode opcode;
1055 static const struct token tokentab3[] =
1057 {"shr", RSH, BINOP_END},
1058 {"shl", LSH, BINOP_END},
1059 {"and", ANDAND, BINOP_END},
1060 {"div", DIV, BINOP_END},
1061 {"not", NOT, BINOP_END},
1062 {"mod", MOD, BINOP_END},
1063 {"inc", INCREMENT, BINOP_END},
1064 {"dec", DECREMENT, BINOP_END},
1065 {"xor", XOR, BINOP_END}
1068 static const struct token tokentab2[] =
1070 {"or", OR, BINOP_END},
1071 {"<>", NOTEQUAL, BINOP_END},
1072 {"<=", LEQ, BINOP_END},
1073 {">=", GEQ, BINOP_END},
1074 {":=", ASSIGN, BINOP_END},
1075 {"::", COLONCOLON, BINOP_END} };
1077 /* Allocate uppercased var: */
1078 /* make an uppercased copy of tokstart. */
1080 uptok (const char *tokstart, int namelen)
1083 char *uptokstart = (char *)malloc(namelen+1);
1084 for (i = 0;i <= namelen;i++)
1086 if ((tokstart[i]>='a' && tokstart[i]<='z'))
1087 uptokstart[i] = tokstart[i]-('a'-'A');
1089 uptokstart[i] = tokstart[i];
1091 uptokstart[namelen]='\0';
1095 /* Read one token, getting characters through lexptr. */
1103 const char *tokstart;
1106 int explen, tempbufindex;
1107 static char *tempbuf;
1108 static int tempbufsize;
1112 prev_lexptr = lexptr;
1115 explen = strlen (lexptr);
1117 /* See if it is a special token of length 3. */
1119 for (i = 0; i < sizeof (tokentab3) / sizeof (tokentab3[0]); i++)
1120 if (strncasecmp (tokstart, tokentab3[i].oper, 3) == 0
1121 && (!isalpha (tokentab3[i].oper[0]) || explen == 3
1122 || (!isalpha (tokstart[3])
1123 && !isdigit (tokstart[3]) && tokstart[3] != '_')))
1126 yylval.opcode = tokentab3[i].opcode;
1127 return tokentab3[i].token;
1130 /* See if it is a special token of length 2. */
1132 for (i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++)
1133 if (strncasecmp (tokstart, tokentab2[i].oper, 2) == 0
1134 && (!isalpha (tokentab2[i].oper[0]) || explen == 2
1135 || (!isalpha (tokstart[2])
1136 && !isdigit (tokstart[2]) && tokstart[2] != '_')))
1139 yylval.opcode = tokentab2[i].opcode;
1140 return tokentab2[i].token;
1143 switch (c = *tokstart)
1146 if (search_field && parse_completion)
1158 /* We either have a character constant ('0' or '\177' for example)
1159 or we have a quoted symbol reference ('foo(int,int)' in object pascal
1164 c = parse_escape (parse_gdbarch (pstate), &lexptr);
1166 error (_("Empty character constant."));
1168 yylval.typed_val_int.val = c;
1169 yylval.typed_val_int.type = parse_type (pstate)->builtin_char;
1174 namelen = skip_quoted (tokstart) - tokstart;
1177 lexptr = tokstart + namelen;
1178 if (lexptr[-1] != '\'')
1179 error (_("Unmatched single quote."));
1182 uptokstart = uptok(tokstart,namelen);
1185 error (_("Invalid character constant."));
1195 if (paren_depth == 0)
1202 if (comma_terminates && paren_depth == 0)
1208 /* Might be a floating point number. */
1209 if (lexptr[1] < '0' || lexptr[1] > '9')
1211 goto symbol; /* Nope, must be a symbol. */
1214 /* FALL THRU into number case. */
1227 /* It's a number. */
1228 int got_dot = 0, got_e = 0, toktype;
1229 const char *p = tokstart;
1230 int hex = input_radix > 10;
1232 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1237 else if (c == '0' && (p[1]=='t' || p[1]=='T'
1238 || p[1]=='d' || p[1]=='D'))
1246 /* This test includes !hex because 'e' is a valid hex digit
1247 and thus does not indicate a floating point number when
1248 the radix is hex. */
1249 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1250 got_dot = got_e = 1;
1251 /* This test does not include !hex, because a '.' always indicates
1252 a decimal floating point number regardless of the radix. */
1253 else if (!got_dot && *p == '.')
1255 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1256 && (*p == '-' || *p == '+'))
1257 /* This is the sign of the exponent, not the end of the
1260 /* We will take any letters or digits. parse_number will
1261 complain if past the radix, or if L or U are not final. */
1262 else if ((*p < '0' || *p > '9')
1263 && ((*p < 'a' || *p > 'z')
1264 && (*p < 'A' || *p > 'Z')))
1267 toktype = parse_number (pstate, tokstart,
1268 p - tokstart, got_dot | got_e, &yylval);
1269 if (toktype == ERROR)
1271 char *err_copy = (char *) alloca (p - tokstart + 1);
1273 memcpy (err_copy, tokstart, p - tokstart);
1274 err_copy[p - tokstart] = 0;
1275 error (_("Invalid number \"%s\"."), err_copy);
1306 /* Build the gdb internal form of the input string in tempbuf,
1307 translating any standard C escape forms seen. Note that the
1308 buffer is null byte terminated *only* for the convenience of
1309 debugging gdb itself and printing the buffer contents when
1310 the buffer contains no embedded nulls. Gdb does not depend
1311 upon the buffer being null byte terminated, it uses the length
1312 string instead. This allows gdb to handle C strings (as well
1313 as strings in other languages) with embedded null bytes. */
1315 tokptr = ++tokstart;
1319 /* Grow the static temp buffer if necessary, including allocating
1320 the first one on demand. */
1321 if (tempbufindex + 1 >= tempbufsize)
1323 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1330 /* Do nothing, loop will terminate. */
1334 c = parse_escape (parse_gdbarch (pstate), &tokptr);
1339 tempbuf[tempbufindex++] = c;
1342 tempbuf[tempbufindex++] = *tokptr++;
1345 } while ((*tokptr != '"') && (*tokptr != '\0'));
1346 if (*tokptr++ != '"')
1348 error (_("Unterminated string in expression."));
1350 tempbuf[tempbufindex] = '\0'; /* See note above. */
1351 yylval.sval.ptr = tempbuf;
1352 yylval.sval.length = tempbufindex;
1357 if (!(c == '_' || c == '$'
1358 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1359 /* We must have come across a bad character (e.g. ';'). */
1360 error (_("Invalid character '%c' in expression."), c);
1362 /* It's a name. See how long it is. */
1364 for (c = tokstart[namelen];
1365 (c == '_' || c == '$' || (c >= '0' && c <= '9')
1366 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1368 /* Template parameter lists are part of the name.
1369 FIXME: This mishandles `print $a<4&&$a>3'. */
1373 int nesting_level = 1;
1374 while (tokstart[++i])
1376 if (tokstart[i] == '<')
1378 else if (tokstart[i] == '>')
1380 if (--nesting_level == 0)
1384 if (tokstart[i] == '>')
1390 /* do NOT uppercase internals because of registers !!! */
1391 c = tokstart[++namelen];
1394 uptokstart = uptok(tokstart,namelen);
1396 /* The token "if" terminates the expression and is NOT
1397 removed from the input stream. */
1398 if (namelen == 2 && uptokstart[0] == 'I' && uptokstart[1] == 'F')
1408 /* Catch specific keywords. Should be done with a data structure. */
1412 if (strcmp (uptokstart, "OBJECT") == 0)
1417 if (strcmp (uptokstart, "RECORD") == 0)
1422 if (strcmp (uptokstart, "SIZEOF") == 0)
1429 if (strcmp (uptokstart, "CLASS") == 0)
1434 if (strcmp (uptokstart, "FALSE") == 0)
1438 return FALSEKEYWORD;
1442 if (strcmp (uptokstart, "TRUE") == 0)
1448 if (strcmp (uptokstart, "SELF") == 0)
1450 /* Here we search for 'this' like
1451 inserted in FPC stabs debug info. */
1452 static const char this_name[] = "this";
1454 if (lookup_symbol (this_name, expression_context_block,
1455 VAR_DOMAIN, NULL).symbol)
1466 yylval.sval.ptr = tokstart;
1467 yylval.sval.length = namelen;
1469 if (*tokstart == '$')
1473 /* $ is the normal prefix for pascal hexadecimal values
1474 but this conflicts with the GDB use for debugger variables
1475 so in expression to enter hexadecimal values
1476 we still need to use C syntax with 0xff */
1477 write_dollar_variable (pstate, yylval.sval);
1478 tmp = (char *) alloca (namelen + 1);
1479 memcpy (tmp, tokstart, namelen);
1480 tmp[namelen] = '\0';
1481 intvar = lookup_only_internalvar (tmp + 1);
1486 /* Use token-type BLOCKNAME for symbols that happen to be defined as
1487 functions or symtabs. If this is not so, then ...
1488 Use token-type TYPENAME for symbols that happen to be defined
1489 currently as names of types; NAME for other symbols.
1490 The caller is not constrained to care about the distinction. */
1492 char *tmp = copy_name (yylval.sval);
1494 struct field_of_this_result is_a_field_of_this;
1498 is_a_field_of_this.type = NULL;
1499 if (search_field && current_type)
1500 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1504 sym = lookup_symbol (tmp, expression_context_block,
1505 VAR_DOMAIN, &is_a_field_of_this).symbol;
1506 /* second chance uppercased (as Free Pascal does). */
1507 if (!sym && is_a_field_of_this.type == NULL && !is_a_field)
1509 for (i = 0; i <= namelen; i++)
1511 if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1512 tmp[i] -= ('a'-'A');
1514 if (search_field && current_type)
1515 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1519 sym = lookup_symbol (tmp, expression_context_block,
1520 VAR_DOMAIN, &is_a_field_of_this).symbol;
1522 /* Third chance Capitalized (as GPC does). */
1523 if (!sym && is_a_field_of_this.type == NULL && !is_a_field)
1525 for (i = 0; i <= namelen; i++)
1529 if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1530 tmp[i] -= ('a'-'A');
1533 if ((tmp[i] >= 'A' && tmp[i] <= 'Z'))
1534 tmp[i] -= ('A'-'a');
1536 if (search_field && current_type)
1537 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1541 sym = lookup_symbol (tmp, expression_context_block,
1542 VAR_DOMAIN, &is_a_field_of_this).symbol;
1545 if (is_a_field || (is_a_field_of_this.type != NULL))
1547 tempbuf = (char *) realloc (tempbuf, namelen + 1);
1548 strncpy (tempbuf, tmp, namelen);
1549 tempbuf [namelen] = 0;
1550 yylval.sval.ptr = tempbuf;
1551 yylval.sval.length = namelen;
1552 yylval.ssym.sym.symbol = NULL;
1553 yylval.ssym.sym.block = NULL;
1555 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
1561 /* Call lookup_symtab, not lookup_partial_symtab, in case there are
1562 no psymtabs (coff, xcoff, or some future change to blow away the
1563 psymtabs once once symbols are read). */
1564 if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
1565 || lookup_symtab (tmp))
1567 yylval.ssym.sym.symbol = sym;
1568 yylval.ssym.sym.block = NULL;
1569 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
1573 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1576 /* Despite the following flaw, we need to keep this code enabled.
1577 Because we can get called from check_stub_method, if we don't
1578 handle nested types then it screws many operations in any
1579 program which uses nested types. */
1580 /* In "A::x", if x is a member function of A and there happens
1581 to be a type (nested or not, since the stabs don't make that
1582 distinction) named x, then this code incorrectly thinks we
1583 are dealing with nested types rather than a member function. */
1586 const char *namestart;
1587 struct symbol *best_sym;
1589 /* Look ahead to detect nested types. This probably should be
1590 done in the grammar, but trying seemed to introduce a lot
1591 of shift/reduce and reduce/reduce conflicts. It's possible
1592 that it could be done, though. Or perhaps a non-grammar, but
1593 less ad hoc, approach would work well. */
1595 /* Since we do not currently have any way of distinguishing
1596 a nested type from a non-nested one (the stabs don't tell
1597 us whether a type is nested), we just ignore the
1604 /* Skip whitespace. */
1605 while (*p == ' ' || *p == '\t' || *p == '\n')
1607 if (*p == ':' && p[1] == ':')
1609 /* Skip the `::'. */
1611 /* Skip whitespace. */
1612 while (*p == ' ' || *p == '\t' || *p == '\n')
1615 while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1616 || (*p >= 'a' && *p <= 'z')
1617 || (*p >= 'A' && *p <= 'Z'))
1621 struct symbol *cur_sym;
1622 /* As big as the whole rest of the expression, which is
1623 at least big enough. */
1625 = (char *) alloca (strlen (tmp) + strlen (namestart)
1630 memcpy (tmp1, tmp, strlen (tmp));
1631 tmp1 += strlen (tmp);
1632 memcpy (tmp1, "::", 2);
1634 memcpy (tmp1, namestart, p - namestart);
1635 tmp1[p - namestart] = '\0';
1636 cur_sym = lookup_symbol (ncopy, expression_context_block,
1637 VAR_DOMAIN, NULL).symbol;
1640 if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1658 yylval.tsym.type = SYMBOL_TYPE (best_sym);
1660 yylval.tsym.type = SYMBOL_TYPE (sym);
1666 = language_lookup_primitive_type (parse_language (pstate),
1667 parse_gdbarch (pstate), tmp);
1668 if (yylval.tsym.type != NULL)
1674 /* Input names that aren't symbols but ARE valid hex numbers,
1675 when the input radix permits them, can be names or numbers
1676 depending on the parse. Note we support radixes > 16 here. */
1678 && ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10)
1679 || (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1681 YYSTYPE newlval; /* Its value is ignored. */
1682 hextype = parse_number (pstate, tokstart, namelen, 0, &newlval);
1685 yylval.ssym.sym.symbol = sym;
1686 yylval.ssym.sym.block = NULL;
1687 yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
1694 /* Any other kind of symbol. */
1695 yylval.ssym.sym.symbol = sym;
1696 yylval.ssym.sym.block = NULL;
1702 pascal_parse (struct parser_state *par_state)
1705 struct cleanup *c = make_cleanup_clear_parser_state (&pstate);
1707 /* Setting up the parser state. */
1708 gdb_assert (par_state != NULL);
1711 result = yyparse ();
1717 yyerror (const char *msg)
1720 lexptr = prev_lexptr;
1722 error (_("A %s in expression, near `%s'."), (msg ? msg : "error"), lexptr);