1 /* YACC parser for Pascal expressions, for GDB.
2 Copyright (C) 2000, 2006, 2007, 2008, 2009, 2010
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 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 /* This file is derived from c-exp.y */
22 /* Parse a Pascal expression from text in a string,
23 and return the result as a struct expression pointer.
24 That structure contains arithmetic operations in reverse polish,
25 with constants represented by operations that are followed by special data.
26 See expression.h for the details of the format.
27 What is important here is that it can be built up sequentially
28 during the process of parsing; the lower levels of the tree always
29 come first in the result.
31 Note that malloc's and realloc's in this file are transformed to
32 xmalloc and xrealloc respectively by the same sed command in the
33 makefile that remaps any other malloc/realloc inserted by the parser
34 generator. Doing this with #defines and trying to control the interaction
35 with include files (<malloc.h> and <stdlib.h> for example) just became
36 too messy, particularly when such includes can be inserted at random
37 times by the parser generator. */
39 /* Known bugs or limitations:
40 - pascal string operations are not supported at all.
41 - there are some problems with boolean types.
42 - Pascal type hexadecimal constants are not supported
43 because they conflict with the internal variables format.
44 Probably also lots of other problems, less well defined PM */
48 #include "gdb_string.h"
50 #include "expression.h"
52 #include "parser-defs.h"
55 #include "bfd.h" /* Required by objfiles.h. */
56 #include "symfile.h" /* Required by objfiles.h. */
57 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
60 #define parse_type builtin_type (parse_gdbarch)
62 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
63 as well as gratuitiously global symbol names, so we can have multiple
64 yacc generated parsers in gdb. Note that these are only the variables
65 produced by yacc. If other parser generators (bison, byacc, etc) produce
66 additional global names that conflict at link time, then those parser
67 generators need to be fixed instead of adding those names to this list. */
69 #define yymaxdepth pascal_maxdepth
70 #define yyparse pascal_parse
71 #define yylex pascal_lex
72 #define yyerror pascal_error
73 #define yylval pascal_lval
74 #define yychar pascal_char
75 #define yydebug pascal_debug
76 #define yypact pascal_pact
77 #define yyr1 pascal_r1
78 #define yyr2 pascal_r2
79 #define yydef pascal_def
80 #define yychk pascal_chk
81 #define yypgo pascal_pgo
82 #define yyact pascal_act
83 #define yyexca pascal_exca
84 #define yyerrflag pascal_errflag
85 #define yynerrs pascal_nerrs
86 #define yyps pascal_ps
87 #define yypv pascal_pv
89 #define yy_yys pascal_yys
90 #define yystate pascal_state
91 #define yytmp pascal_tmp
93 #define yy_yyv pascal_yyv
94 #define yyval pascal_val
95 #define yylloc pascal_lloc
96 #define yyreds pascal_reds /* With YYDEBUG defined */
97 #define yytoks pascal_toks /* With YYDEBUG defined */
98 #define yyname pascal_name /* With YYDEBUG defined */
99 #define yyrule pascal_rule /* With YYDEBUG defined */
100 #define yylhs pascal_yylhs
101 #define yylen pascal_yylen
102 #define yydefred pascal_yydefred
103 #define yydgoto pascal_yydgoto
104 #define yysindex pascal_yysindex
105 #define yyrindex pascal_yyrindex
106 #define yygindex pascal_yygindex
107 #define yytable pascal_yytable
108 #define yycheck pascal_yycheck
111 #define YYDEBUG 1 /* Default to yydebug support */
114 #define YYFPRINTF parser_fprintf
118 static int yylex (void);
123 static char * uptok (char *, int);
126 /* Although the yacc "value" of an expression is not used,
127 since the result is stored in the structure being created,
128 other node types do have values. */
145 struct symtoken ssym;
148 enum exp_opcode opcode;
149 struct internalvar *ivar;
156 /* YYSTYPE gets defined by %union */
158 parse_number (char *, int, int, YYSTYPE *);
160 static struct type *current_type;
161 static int leftdiv_is_integer;
162 static void push_current_type (void);
163 static void pop_current_type (void);
164 static int search_field;
167 %type <voidval> exp exp1 type_exp start normal_start variable qualified_name
168 %type <tval> type typebase
169 /* %type <bval> block */
171 /* Fancy type parsing. */
174 %token <typed_val_int> INT
175 %token <typed_val_float> FLOAT
177 /* Both NAME and TYPENAME tokens represent symbols in the input,
178 and both convey their data as strings.
179 But a TYPENAME is a string that happens to be defined as a typedef
180 or builtin type name (such as int or char)
181 and a NAME is any other symbol.
182 Contexts where this distinction is not important can use the
183 nonterminal "name", which matches either NAME or TYPENAME. */
186 %token <sval> FIELDNAME
187 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
188 %token <tsym> TYPENAME
190 %type <ssym> name_not_typename
192 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
193 but which would parse as a valid number in the current input radix.
194 E.g. "c" when input_radix==16. Depending on the parse, it will be
195 turned into a name or into a number. */
197 %token <ssym> NAME_OR_INT
199 %token STRUCT CLASS SIZEOF COLONCOLON
202 /* Special type cases, put in to allow the parser to distinguish different
205 %token <voidval> VARIABLE
210 %token <lval> TRUEKEYWORD FALSEKEYWORD
220 %left '<' '>' LEQ GEQ
221 %left LSH RSH DIV MOD
225 %right UNARY INCREMENT DECREMENT
226 %right ARROW '.' '[' '('
228 %token <ssym> BLOCKNAME
235 start : { current_type = NULL;
237 leftdiv_is_integer = 0;
248 { write_exp_elt_opcode(OP_TYPE);
249 write_exp_elt_type($1);
250 write_exp_elt_opcode(OP_TYPE);
251 current_type = $1; } ;
253 /* Expressions, including the comma operator. */
256 { write_exp_elt_opcode (BINOP_COMMA); }
259 /* Expressions, not including the comma operator. */
260 exp : exp '^' %prec UNARY
261 { write_exp_elt_opcode (UNOP_IND);
263 current_type = TYPE_TARGET_TYPE (current_type); }
266 exp : '@' exp %prec UNARY
267 { write_exp_elt_opcode (UNOP_ADDR);
269 current_type = TYPE_POINTER_TYPE (current_type); }
272 exp : '-' exp %prec UNARY
273 { write_exp_elt_opcode (UNOP_NEG); }
276 exp : NOT exp %prec UNARY
277 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
280 exp : INCREMENT '(' exp ')' %prec UNARY
281 { write_exp_elt_opcode (UNOP_PREINCREMENT); }
284 exp : DECREMENT '(' exp ')' %prec UNARY
285 { write_exp_elt_opcode (UNOP_PREDECREMENT); }
288 exp : exp '.' { search_field = 1; }
291 { write_exp_elt_opcode (STRUCTOP_STRUCT);
292 write_exp_string ($4);
293 write_exp_elt_opcode (STRUCTOP_STRUCT);
296 { while (TYPE_CODE (current_type) == TYPE_CODE_PTR)
297 current_type = TYPE_TARGET_TYPE (current_type);
298 current_type = lookup_struct_elt_type (
299 current_type, $4.ptr, 0); };
302 /* We need to save the current_type value */
305 arrayfieldindex = is_pascal_string_type (
306 current_type, NULL, NULL,
307 NULL, NULL, &arrayname);
310 struct stoken stringsval;
311 stringsval.ptr = alloca (strlen (arrayname) + 1);
312 stringsval.length = strlen (arrayname);
313 strcpy (stringsval.ptr, arrayname);
314 current_type = TYPE_FIELD_TYPE (current_type,
315 arrayfieldindex - 1);
316 write_exp_elt_opcode (STRUCTOP_STRUCT);
317 write_exp_string (stringsval);
318 write_exp_elt_opcode (STRUCTOP_STRUCT);
320 push_current_type (); }
322 { pop_current_type ();
323 write_exp_elt_opcode (BINOP_SUBSCRIPT);
325 current_type = TYPE_TARGET_TYPE (current_type); }
329 /* This is to save the value of arglist_len
330 being accumulated by an outer function call. */
331 { push_current_type ();
333 arglist ')' %prec ARROW
334 { write_exp_elt_opcode (OP_FUNCALL);
335 write_exp_elt_longcst ((LONGEST) end_arglist ());
336 write_exp_elt_opcode (OP_FUNCALL);
339 current_type = TYPE_TARGET_TYPE (current_type);
346 | arglist ',' exp %prec ABOVE_COMMA
350 exp : type '(' exp ')' %prec UNARY
353 /* Allow automatic dereference of classes. */
354 if ((TYPE_CODE (current_type) == TYPE_CODE_PTR)
355 && (TYPE_CODE (TYPE_TARGET_TYPE (current_type)) == TYPE_CODE_CLASS)
356 && (TYPE_CODE ($1) == TYPE_CODE_CLASS))
357 write_exp_elt_opcode (UNOP_IND);
359 write_exp_elt_opcode (UNOP_CAST);
360 write_exp_elt_type ($1);
361 write_exp_elt_opcode (UNOP_CAST);
369 /* Binary operators in order of decreasing precedence. */
372 { write_exp_elt_opcode (BINOP_MUL); }
376 if (current_type && is_integral_type (current_type))
377 leftdiv_is_integer = 1;
381 if (leftdiv_is_integer && current_type
382 && is_integral_type (current_type))
384 write_exp_elt_opcode (UNOP_CAST);
385 write_exp_elt_type (parse_type->builtin_long_double);
386 current_type = parse_type->builtin_long_double;
387 write_exp_elt_opcode (UNOP_CAST);
388 leftdiv_is_integer = 0;
391 write_exp_elt_opcode (BINOP_DIV);
396 { write_exp_elt_opcode (BINOP_INTDIV); }
400 { write_exp_elt_opcode (BINOP_REM); }
404 { write_exp_elt_opcode (BINOP_ADD); }
408 { write_exp_elt_opcode (BINOP_SUB); }
412 { write_exp_elt_opcode (BINOP_LSH); }
416 { write_exp_elt_opcode (BINOP_RSH); }
420 { write_exp_elt_opcode (BINOP_EQUAL);
421 current_type = parse_type->builtin_bool;
425 exp : exp NOTEQUAL exp
426 { write_exp_elt_opcode (BINOP_NOTEQUAL);
427 current_type = parse_type->builtin_bool;
432 { write_exp_elt_opcode (BINOP_LEQ);
433 current_type = parse_type->builtin_bool;
438 { write_exp_elt_opcode (BINOP_GEQ);
439 current_type = parse_type->builtin_bool;
444 { write_exp_elt_opcode (BINOP_LESS);
445 current_type = parse_type->builtin_bool;
450 { write_exp_elt_opcode (BINOP_GTR);
451 current_type = parse_type->builtin_bool;
456 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
460 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
464 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
468 { write_exp_elt_opcode (BINOP_ASSIGN); }
472 { write_exp_elt_opcode (OP_BOOL);
473 write_exp_elt_longcst ((LONGEST) $1);
474 current_type = parse_type->builtin_bool;
475 write_exp_elt_opcode (OP_BOOL); }
479 { write_exp_elt_opcode (OP_BOOL);
480 write_exp_elt_longcst ((LONGEST) $1);
481 current_type = parse_type->builtin_bool;
482 write_exp_elt_opcode (OP_BOOL); }
486 { write_exp_elt_opcode (OP_LONG);
487 write_exp_elt_type ($1.type);
488 current_type = $1.type;
489 write_exp_elt_longcst ((LONGEST)($1.val));
490 write_exp_elt_opcode (OP_LONG); }
495 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
496 write_exp_elt_opcode (OP_LONG);
497 write_exp_elt_type (val.typed_val_int.type);
498 current_type = val.typed_val_int.type;
499 write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
500 write_exp_elt_opcode (OP_LONG);
506 { write_exp_elt_opcode (OP_DOUBLE);
507 write_exp_elt_type ($1.type);
508 current_type = $1.type;
509 write_exp_elt_dblcst ($1.dval);
510 write_exp_elt_opcode (OP_DOUBLE); }
517 /* Already written by write_dollar_variable. */
520 exp : SIZEOF '(' type ')' %prec UNARY
521 { write_exp_elt_opcode (OP_LONG);
522 write_exp_elt_type (parse_type->builtin_int);
524 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
525 write_exp_elt_opcode (OP_LONG); }
529 { /* C strings are converted into array constants with
530 an explicit null byte added at the end. Thus
531 the array upper bound is the string length.
532 There is no such thing in C as a completely empty
534 char *sp = $1.ptr; int count = $1.length;
537 write_exp_elt_opcode (OP_LONG);
538 write_exp_elt_type (parse_type->builtin_char);
539 write_exp_elt_longcst ((LONGEST)(*sp++));
540 write_exp_elt_opcode (OP_LONG);
542 write_exp_elt_opcode (OP_LONG);
543 write_exp_elt_type (parse_type->builtin_char);
544 write_exp_elt_longcst ((LONGEST)'\0');
545 write_exp_elt_opcode (OP_LONG);
546 write_exp_elt_opcode (OP_ARRAY);
547 write_exp_elt_longcst ((LONGEST) 0);
548 write_exp_elt_longcst ((LONGEST) ($1.length));
549 write_exp_elt_opcode (OP_ARRAY); }
555 struct value * this_val;
556 struct type * this_type;
557 write_exp_elt_opcode (OP_THIS);
558 write_exp_elt_opcode (OP_THIS);
559 /* we need type of this */
560 this_val = value_of_this (0);
562 this_type = value_type (this_val);
567 if (TYPE_CODE (this_type) == TYPE_CODE_PTR)
569 this_type = TYPE_TARGET_TYPE (this_type);
570 write_exp_elt_opcode (UNOP_IND);
574 current_type = this_type;
578 /* end of object pascal. */
583 $$ = SYMBOL_BLOCK_VALUE ($1.sym);
587 lookup_symtab (copy_name ($1.stoken));
589 $$ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (tem), STATIC_BLOCK);
591 error ("No file or function \"%s\".",
592 copy_name ($1.stoken));
597 block : block COLONCOLON name
599 = lookup_symbol (copy_name ($3), $1,
600 VAR_DOMAIN, (int *) NULL);
601 if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
602 error ("No function \"%s\" in specified context.",
604 $$ = SYMBOL_BLOCK_VALUE (tem); }
607 variable: block COLONCOLON name
608 { struct symbol *sym;
609 sym = lookup_symbol (copy_name ($3), $1,
610 VAR_DOMAIN, (int *) NULL);
612 error ("No symbol \"%s\" in specified context.",
615 write_exp_elt_opcode (OP_VAR_VALUE);
616 /* block_found is set by lookup_symbol. */
617 write_exp_elt_block (block_found);
618 write_exp_elt_sym (sym);
619 write_exp_elt_opcode (OP_VAR_VALUE); }
622 qualified_name: typebase COLONCOLON name
624 struct type *type = $1;
625 if (TYPE_CODE (type) != TYPE_CODE_STRUCT
626 && TYPE_CODE (type) != TYPE_CODE_UNION)
627 error ("`%s' is not defined as an aggregate type.",
630 write_exp_elt_opcode (OP_SCOPE);
631 write_exp_elt_type (type);
632 write_exp_string ($3);
633 write_exp_elt_opcode (OP_SCOPE);
637 variable: qualified_name
640 char *name = copy_name ($2);
642 struct minimal_symbol *msymbol;
645 lookup_symbol (name, (const struct block *) NULL,
646 VAR_DOMAIN, (int *) NULL);
649 write_exp_elt_opcode (OP_VAR_VALUE);
650 write_exp_elt_block (NULL);
651 write_exp_elt_sym (sym);
652 write_exp_elt_opcode (OP_VAR_VALUE);
656 msymbol = lookup_minimal_symbol (name, NULL, NULL);
658 write_exp_msymbol (msymbol);
659 else if (!have_full_symbols () && !have_partial_symbols ())
660 error ("No symbol table is loaded. Use the \"file\" command.");
662 error ("No symbol \"%s\" in current context.", name);
666 variable: name_not_typename
667 { struct symbol *sym = $1.sym;
671 if (symbol_read_needs_frame (sym))
673 if (innermost_block == 0
674 || contained_in (block_found,
676 innermost_block = block_found;
679 write_exp_elt_opcode (OP_VAR_VALUE);
680 /* We want to use the selected frame, not
681 another more inner frame which happens to
682 be in the same block. */
683 write_exp_elt_block (NULL);
684 write_exp_elt_sym (sym);
685 write_exp_elt_opcode (OP_VAR_VALUE);
686 current_type = sym->type; }
687 else if ($1.is_a_field_of_this)
689 struct value * this_val;
690 struct type * this_type;
691 /* Object pascal: it hangs off of `this'. Must
692 not inadvertently convert from a method call
694 if (innermost_block == 0
695 || contained_in (block_found,
697 innermost_block = block_found;
698 write_exp_elt_opcode (OP_THIS);
699 write_exp_elt_opcode (OP_THIS);
700 write_exp_elt_opcode (STRUCTOP_PTR);
701 write_exp_string ($1.stoken);
702 write_exp_elt_opcode (STRUCTOP_PTR);
703 /* we need type of this */
704 this_val = value_of_this (0);
706 this_type = value_type (this_val);
710 current_type = lookup_struct_elt_type (
712 copy_name ($1.stoken), 0);
718 struct minimal_symbol *msymbol;
719 char *arg = copy_name ($1.stoken);
722 lookup_minimal_symbol (arg, NULL, NULL);
724 write_exp_msymbol (msymbol);
725 else if (!have_full_symbols () && !have_partial_symbols ())
726 error ("No symbol table is loaded. Use the \"file\" command.");
728 error ("No symbol \"%s\" in current context.",
729 copy_name ($1.stoken));
738 /* We used to try to recognize more pointer to member types here, but
739 that didn't work (shift/reduce conflicts meant that these rules never
740 got executed). The problem is that
741 int (foo::bar::baz::bizzle)
742 is a function type but
743 int (foo::bar::baz::bizzle::*)
744 is a pointer to member type. Stroustrup loses again! */
749 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
751 { $$ = lookup_pointer_type ($2); }
755 { $$ = lookup_struct (copy_name ($2),
756 expression_context_block); }
758 { $$ = lookup_struct (copy_name ($2),
759 expression_context_block); }
760 /* "const" and "volatile" are curently ignored. A type qualifier
761 after the type is handled in the ptype rule. I think these could
765 name : NAME { $$ = $1.stoken; }
766 | BLOCKNAME { $$ = $1.stoken; }
767 | TYPENAME { $$ = $1.stoken; }
768 | NAME_OR_INT { $$ = $1.stoken; }
771 name_not_typename : NAME
773 /* These would be useful if name_not_typename was useful, but it is just
774 a fake for "variable", so these cause reduce/reduce conflicts because
775 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
776 =exp) or just an exp. If name_not_typename was ever used in an lvalue
777 context where only a name could occur, this might be useful.
784 /* Take care of parsing a number (anything that starts with a digit).
785 Set yylval and return the token type; update lexptr.
786 LEN is the number of characters in it. */
788 /*** Needs some error checking for the float case ***/
791 parse_number (p, len, parsed_float, putithere)
797 /* FIXME: Shouldn't these be unsigned? We don't deal with negative values
798 here, and we do kind of silly things like cast to unsigned. */
805 int base = input_radix;
808 /* Number of "L" suffixes encountered. */
811 /* We have found a "L" or "U" suffix. */
812 int found_suffix = 0;
815 struct type *signed_type;
816 struct type *unsigned_type;
820 /* It's a float since it contains a point or an exponent. */
822 int num = 0; /* number of tokens scanned by scanf */
823 char saved_char = p[len];
825 p[len] = 0; /* null-terminate the token */
826 num = sscanf (p, "%" DOUBLEST_SCAN_FORMAT "%c",
827 &putithere->typed_val_float.dval, &c);
828 p[len] = saved_char; /* restore the input stream */
829 if (num != 1) /* check scanf found ONLY a float ... */
831 /* See if it has `f' or `l' suffix (float or long double). */
833 c = tolower (p[len - 1]);
836 putithere->typed_val_float.type = parse_type->builtin_float;
838 putithere->typed_val_float.type = parse_type->builtin_long_double;
839 else if (isdigit (c) || c == '.')
840 putithere->typed_val_float.type = parse_type->builtin_double;
847 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
881 if (c >= 'A' && c <= 'Z')
883 if (c != 'l' && c != 'u')
885 if (c >= '0' && c <= '9')
893 if (base > 10 && c >= 'a' && c <= 'f')
897 n += i = c - 'a' + 10;
910 return ERROR; /* Char not a digit */
913 return ERROR; /* Invalid digit in this base */
915 /* Portably test for overflow (only works for nonzero values, so make
916 a second check for zero). FIXME: Can't we just make n and prevn
917 unsigned and avoid this? */
918 if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
919 unsigned_p = 1; /* Try something unsigned */
921 /* Portably test for unsigned overflow.
922 FIXME: This check is wrong; for example it doesn't find overflow
923 on 0x123456789 when LONGEST is 32 bits. */
924 if (c != 'l' && c != 'u' && n != 0)
926 if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
927 error ("Numeric constant too large.");
932 /* An integer constant is an int, a long, or a long long. An L
933 suffix forces it to be long; an LL suffix forces it to be long
934 long. If not forced to a larger size, it gets the first type of
935 the above that it fits in. To figure out whether it fits, we
936 shift it right and see whether anything remains. Note that we
937 can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
938 operation, because many compilers will warn about such a shift
939 (which always produces a zero result). Sometimes gdbarch_int_bit
940 or gdbarch_long_bit will be that big, sometimes not. To deal with
941 the case where it is we just always shift the value more than
942 once, with fewer bits each time. */
944 un = (ULONGEST)n >> 2;
946 && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
948 high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
950 /* A large decimal (not hex or octal) constant (between INT_MAX
951 and UINT_MAX) is a long or unsigned long, according to ANSI,
952 never an unsigned int, but this code treats it as unsigned
953 int. This probably should be fixed. GCC gives a warning on
956 unsigned_type = parse_type->builtin_unsigned_int;
957 signed_type = parse_type->builtin_int;
960 && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
962 high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
963 unsigned_type = parse_type->builtin_unsigned_long;
964 signed_type = parse_type->builtin_long;
969 if (sizeof (ULONGEST) * HOST_CHAR_BIT
970 < gdbarch_long_long_bit (parse_gdbarch))
971 /* A long long does not fit in a LONGEST. */
972 shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
974 shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
975 high_bit = (ULONGEST) 1 << shift;
976 unsigned_type = parse_type->builtin_unsigned_long_long;
977 signed_type = parse_type->builtin_long_long;
980 putithere->typed_val_int.val = n;
982 /* If the high bit of the worked out type is set then this number
983 has to be unsigned. */
985 if (unsigned_p || (n & high_bit))
987 putithere->typed_val_int.type = unsigned_type;
991 putithere->typed_val_int.type = signed_type;
1000 struct type *stored;
1001 struct type_push *next;
1004 static struct type_push *tp_top = NULL;
1007 push_current_type (void)
1009 struct type_push *tpnew;
1010 tpnew = (struct type_push *) malloc (sizeof (struct type_push));
1011 tpnew->next = tp_top;
1012 tpnew->stored = current_type;
1013 current_type = NULL;
1018 pop_current_type (void)
1020 struct type_push *tp = tp_top;
1023 current_type = tp->stored;
1033 enum exp_opcode opcode;
1036 static const struct token tokentab3[] =
1038 {"shr", RSH, BINOP_END},
1039 {"shl", LSH, BINOP_END},
1040 {"and", ANDAND, BINOP_END},
1041 {"div", DIV, BINOP_END},
1042 {"not", NOT, BINOP_END},
1043 {"mod", MOD, BINOP_END},
1044 {"inc", INCREMENT, BINOP_END},
1045 {"dec", DECREMENT, BINOP_END},
1046 {"xor", XOR, BINOP_END}
1049 static const struct token tokentab2[] =
1051 {"or", OR, BINOP_END},
1052 {"<>", NOTEQUAL, BINOP_END},
1053 {"<=", LEQ, BINOP_END},
1054 {">=", GEQ, BINOP_END},
1055 {":=", ASSIGN, BINOP_END},
1056 {"::", COLONCOLON, BINOP_END} };
1058 /* Allocate uppercased var */
1059 /* make an uppercased copy of tokstart */
1060 static char * uptok (tokstart, namelen)
1065 char *uptokstart = (char *)malloc(namelen+1);
1066 for (i = 0;i <= namelen;i++)
1068 if ((tokstart[i]>='a' && tokstart[i]<='z'))
1069 uptokstart[i] = tokstart[i]-('a'-'A');
1071 uptokstart[i] = tokstart[i];
1073 uptokstart[namelen]='\0';
1076 /* Read one token, getting characters through lexptr. */
1088 int explen, tempbufindex;
1089 static char *tempbuf;
1090 static int tempbufsize;
1094 prev_lexptr = lexptr;
1097 explen = strlen (lexptr);
1098 /* See if it is a special token of length 3. */
1100 for (i = 0; i < sizeof (tokentab3) / sizeof (tokentab3[0]); i++)
1101 if (strncasecmp (tokstart, tokentab3[i].operator, 3) == 0
1102 && (!isalpha (tokentab3[i].operator[0]) || explen == 3
1103 || (!isalpha (tokstart[3]) && !isdigit (tokstart[3]) && tokstart[3] != '_')))
1106 yylval.opcode = tokentab3[i].opcode;
1107 return tokentab3[i].token;
1110 /* See if it is a special token of length 2. */
1112 for (i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++)
1113 if (strncasecmp (tokstart, tokentab2[i].operator, 2) == 0
1114 && (!isalpha (tokentab2[i].operator[0]) || explen == 2
1115 || (!isalpha (tokstart[2]) && !isdigit (tokstart[2]) && tokstart[2] != '_')))
1118 yylval.opcode = tokentab2[i].opcode;
1119 return tokentab2[i].token;
1122 switch (c = *tokstart)
1134 /* We either have a character constant ('0' or '\177' for example)
1135 or we have a quoted symbol reference ('foo(int,int)' in object pascal
1140 c = parse_escape (parse_gdbarch, &lexptr);
1142 error ("Empty character constant.");
1144 yylval.typed_val_int.val = c;
1145 yylval.typed_val_int.type = parse_type->builtin_char;
1150 namelen = skip_quoted (tokstart) - tokstart;
1153 lexptr = tokstart + namelen;
1154 if (lexptr[-1] != '\'')
1155 error ("Unmatched single quote.");
1158 uptokstart = uptok(tokstart,namelen);
1161 error ("Invalid character constant.");
1171 if (paren_depth == 0)
1178 if (comma_terminates && paren_depth == 0)
1184 /* Might be a floating point number. */
1185 if (lexptr[1] < '0' || lexptr[1] > '9')
1186 goto symbol; /* Nope, must be a symbol. */
1187 /* FALL THRU into number case. */
1200 /* It's a number. */
1201 int got_dot = 0, got_e = 0, toktype;
1203 int hex = input_radix > 10;
1205 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1210 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1218 /* This test includes !hex because 'e' is a valid hex digit
1219 and thus does not indicate a floating point number when
1220 the radix is hex. */
1221 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1222 got_dot = got_e = 1;
1223 /* This test does not include !hex, because a '.' always indicates
1224 a decimal floating point number regardless of the radix. */
1225 else if (!got_dot && *p == '.')
1227 else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1228 && (*p == '-' || *p == '+'))
1229 /* This is the sign of the exponent, not the end of the
1232 /* We will take any letters or digits. parse_number will
1233 complain if past the radix, or if L or U are not final. */
1234 else if ((*p < '0' || *p > '9')
1235 && ((*p < 'a' || *p > 'z')
1236 && (*p < 'A' || *p > 'Z')))
1239 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
1240 if (toktype == ERROR)
1242 char *err_copy = (char *) alloca (p - tokstart + 1);
1244 memcpy (err_copy, tokstart, p - tokstart);
1245 err_copy[p - tokstart] = 0;
1246 error ("Invalid number \"%s\".", err_copy);
1277 /* Build the gdb internal form of the input string in tempbuf,
1278 translating any standard C escape forms seen. Note that the
1279 buffer is null byte terminated *only* for the convenience of
1280 debugging gdb itself and printing the buffer contents when
1281 the buffer contains no embedded nulls. Gdb does not depend
1282 upon the buffer being null byte terminated, it uses the length
1283 string instead. This allows gdb to handle C strings (as well
1284 as strings in other languages) with embedded null bytes */
1286 tokptr = ++tokstart;
1290 /* Grow the static temp buffer if necessary, including allocating
1291 the first one on demand. */
1292 if (tempbufindex + 1 >= tempbufsize)
1294 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1301 /* Do nothing, loop will terminate. */
1305 c = parse_escape (parse_gdbarch, &tokptr);
1310 tempbuf[tempbufindex++] = c;
1313 tempbuf[tempbufindex++] = *tokptr++;
1316 } while ((*tokptr != '"') && (*tokptr != '\0'));
1317 if (*tokptr++ != '"')
1319 error ("Unterminated string in expression.");
1321 tempbuf[tempbufindex] = '\0'; /* See note above */
1322 yylval.sval.ptr = tempbuf;
1323 yylval.sval.length = tempbufindex;
1328 if (!(c == '_' || c == '$'
1329 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1330 /* We must have come across a bad character (e.g. ';'). */
1331 error ("Invalid character '%c' in expression.", c);
1333 /* It's a name. See how long it is. */
1335 for (c = tokstart[namelen];
1336 (c == '_' || c == '$' || (c >= '0' && c <= '9')
1337 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1339 /* Template parameter lists are part of the name.
1340 FIXME: This mishandles `print $a<4&&$a>3'. */
1344 int nesting_level = 1;
1345 while (tokstart[++i])
1347 if (tokstart[i] == '<')
1349 else if (tokstart[i] == '>')
1351 if (--nesting_level == 0)
1355 if (tokstart[i] == '>')
1361 /* do NOT uppercase internals because of registers !!! */
1362 c = tokstart[++namelen];
1365 uptokstart = uptok(tokstart,namelen);
1367 /* The token "if" terminates the expression and is NOT
1368 removed from the input stream. */
1369 if (namelen == 2 && uptokstart[0] == 'I' && uptokstart[1] == 'F')
1379 /* Catch specific keywords. Should be done with a data structure. */
1383 if (strcmp (uptokstart, "OBJECT") == 0)
1388 if (strcmp (uptokstart, "RECORD") == 0)
1393 if (strcmp (uptokstart, "SIZEOF") == 0)
1400 if (strcmp (uptokstart, "CLASS") == 0)
1405 if (strcmp (uptokstart, "FALSE") == 0)
1409 return FALSEKEYWORD;
1413 if (strcmp (uptokstart, "TRUE") == 0)
1419 if (strcmp (uptokstart, "SELF") == 0)
1421 /* here we search for 'this' like
1422 inserted in FPC stabs debug info */
1423 static const char this_name[] = "this";
1425 if (lookup_symbol (this_name, expression_context_block,
1426 VAR_DOMAIN, (int *) NULL))
1437 yylval.sval.ptr = tokstart;
1438 yylval.sval.length = namelen;
1440 if (*tokstart == '$')
1442 /* $ is the normal prefix for pascal hexadecimal values
1443 but this conflicts with the GDB use for debugger variables
1444 so in expression to enter hexadecimal values
1445 we still need to use C syntax with 0xff */
1446 write_dollar_variable (yylval.sval);
1451 /* Use token-type BLOCKNAME for symbols that happen to be defined as
1452 functions or symtabs. If this is not so, then ...
1453 Use token-type TYPENAME for symbols that happen to be defined
1454 currently as names of types; NAME for other symbols.
1455 The caller is not constrained to care about the distinction. */
1457 char *tmp = copy_name (yylval.sval);
1459 int is_a_field_of_this = 0;
1464 if (search_field && current_type)
1465 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1469 sym = lookup_symbol (tmp, expression_context_block,
1470 VAR_DOMAIN, &is_a_field_of_this);
1471 /* second chance uppercased (as Free Pascal does). */
1472 if (!sym && !is_a_field_of_this && !is_a_field)
1474 for (i = 0; i <= namelen; i++)
1476 if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1477 tmp[i] -= ('a'-'A');
1479 if (search_field && current_type)
1480 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1484 sym = lookup_symbol (tmp, expression_context_block,
1485 VAR_DOMAIN, &is_a_field_of_this);
1486 if (sym || is_a_field_of_this || is_a_field)
1487 for (i = 0; i <= namelen; i++)
1489 if ((tokstart[i] >= 'a' && tokstart[i] <= 'z'))
1490 tokstart[i] -= ('a'-'A');
1493 /* Third chance Capitalized (as GPC does). */
1494 if (!sym && !is_a_field_of_this && !is_a_field)
1496 for (i = 0; i <= namelen; i++)
1500 if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1501 tmp[i] -= ('a'-'A');
1504 if ((tmp[i] >= 'A' && tmp[i] <= 'Z'))
1505 tmp[i] -= ('A'-'a');
1507 if (search_field && current_type)
1508 is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1512 sym = lookup_symbol (tmp, expression_context_block,
1513 VAR_DOMAIN, &is_a_field_of_this);
1514 if (sym || is_a_field_of_this || is_a_field)
1515 for (i = 0; i <= namelen; i++)
1519 if ((tokstart[i] >= 'a' && tokstart[i] <= 'z'))
1520 tokstart[i] -= ('a'-'A');
1523 if ((tokstart[i] >= 'A' && tokstart[i] <= 'Z'))
1524 tokstart[i] -= ('A'-'a');
1530 tempbuf = (char *) realloc (tempbuf, namelen + 1);
1531 strncpy (tempbuf, tokstart, namelen); tempbuf [namelen] = 0;
1532 yylval.sval.ptr = tempbuf;
1533 yylval.sval.length = namelen;
1537 /* Call lookup_symtab, not lookup_partial_symtab, in case there are
1538 no psymtabs (coff, xcoff, or some future change to blow away the
1539 psymtabs once once symbols are read). */
1540 if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
1541 || lookup_symtab (tmp))
1543 yylval.ssym.sym = sym;
1544 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1548 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1551 /* Despite the following flaw, we need to keep this code enabled.
1552 Because we can get called from check_stub_method, if we don't
1553 handle nested types then it screws many operations in any
1554 program which uses nested types. */
1555 /* In "A::x", if x is a member function of A and there happens
1556 to be a type (nested or not, since the stabs don't make that
1557 distinction) named x, then this code incorrectly thinks we
1558 are dealing with nested types rather than a member function. */
1562 struct symbol *best_sym;
1564 /* Look ahead to detect nested types. This probably should be
1565 done in the grammar, but trying seemed to introduce a lot
1566 of shift/reduce and reduce/reduce conflicts. It's possible
1567 that it could be done, though. Or perhaps a non-grammar, but
1568 less ad hoc, approach would work well. */
1570 /* Since we do not currently have any way of distinguishing
1571 a nested type from a non-nested one (the stabs don't tell
1572 us whether a type is nested), we just ignore the
1579 /* Skip whitespace. */
1580 while (*p == ' ' || *p == '\t' || *p == '\n')
1582 if (*p == ':' && p[1] == ':')
1584 /* Skip the `::'. */
1586 /* Skip whitespace. */
1587 while (*p == ' ' || *p == '\t' || *p == '\n')
1590 while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1591 || (*p >= 'a' && *p <= 'z')
1592 || (*p >= 'A' && *p <= 'Z'))
1596 struct symbol *cur_sym;
1597 /* As big as the whole rest of the expression, which is
1598 at least big enough. */
1599 char *ncopy = alloca (strlen (tmp)+strlen (namestart)+3);
1603 memcpy (tmp1, tmp, strlen (tmp));
1604 tmp1 += strlen (tmp);
1605 memcpy (tmp1, "::", 2);
1607 memcpy (tmp1, namestart, p - namestart);
1608 tmp1[p - namestart] = '\0';
1609 cur_sym = lookup_symbol (ncopy, expression_context_block,
1610 VAR_DOMAIN, (int *) NULL);
1613 if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1631 yylval.tsym.type = SYMBOL_TYPE (best_sym);
1633 yylval.tsym.type = SYMBOL_TYPE (sym);
1639 = language_lookup_primitive_type_by_name (parse_language,
1640 parse_gdbarch, tmp);
1641 if (yylval.tsym.type != NULL)
1647 /* Input names that aren't symbols but ARE valid hex numbers,
1648 when the input radix permits them, can be names or numbers
1649 depending on the parse. Note we support radixes > 16 here. */
1651 && ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10)
1652 || (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1654 YYSTYPE newlval; /* Its value is ignored. */
1655 hextype = parse_number (tokstart, namelen, 0, &newlval);
1658 yylval.ssym.sym = sym;
1659 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1666 /* Any other kind of symbol */
1667 yylval.ssym.sym = sym;
1668 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1678 lexptr = prev_lexptr;
1680 error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);