1 /* YACC parser for Fortran expressions, for GDB.
2 Copyright 1986, 1989, 1990, 1991, 1993, 1994
3 Free Software Foundation, Inc.
4 Contributed by Motorola. Adapted from the C parser by Farooq Butt
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
23 /* This was blantantly ripped off the C expression parser, please
24 be aware of that as you look at its basic structure -FMB */
26 /* Parse a F77 expression from text in a string,
27 and return the result as a struct expression pointer.
28 That structure contains arithmetic operations in reverse polish,
29 with constants represented by operations that are followed by special data.
30 See expression.h for the details of the format.
31 What is important here is that it can be built up sequentially
32 during the process of parsing; the lower levels of the tree always
33 come first in the result.
35 Note that malloc's and realloc's in this file are transformed to
36 xmalloc and xrealloc respectively by the same sed command in the
37 makefile that remaps any other malloc/realloc inserted by the parser
38 generator. Doing this with #defines and trying to control the interaction
39 with include files (<malloc.h> and <stdlib.h> for example) just became
40 too messy, particularly when such includes can be inserted at random
41 times by the parser generator. */
47 #include "expression.h"
49 #include "parser-defs.h"
52 #include "bfd.h" /* Required by objfiles.h. */
53 #include "symfile.h" /* Required by objfiles.h. */
54 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
56 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
57 as well as gratuitiously global symbol names, so we can have multiple
58 yacc generated parsers in gdb. Note that these are only the variables
59 produced by yacc. If other parser generators (bison, byacc, etc) produce
60 additional global names that conflict at link time, then those parser
61 generators need to be fixed instead of adding those names to this list. */
63 #define yymaxdepth f_maxdepth
64 #define yyparse f_parse
66 #define yyerror f_error
69 #define yydebug f_debug
78 #define yyerrflag f_errflag
79 #define yynerrs f_nerrs
84 #define yystate f_state
90 #define yyreds f_reds /* With YYDEBUG defined */
91 #define yytoks f_toks /* With YYDEBUG defined */
94 #define yydefred f_yydefred
95 #define yydgoto f_yydgoto
96 #define yysindex f_yysindex
97 #define yyrindex f_yyrindex
98 #define yygindex f_yygindex
99 #define yytable f_yytable
100 #define yycheck f_yycheck
103 #define YYDEBUG 1 /* Default to no yydebug support */
106 int yyparse PARAMS ((void));
108 static int yylex PARAMS ((void));
110 void yyerror PARAMS ((char *));
114 /* Although the yacc "value" of an expression is not used,
115 since the result is stored in the structure being created,
116 other node types do have values. */
130 struct symtoken ssym;
133 enum exp_opcode opcode;
134 struct internalvar *ivar;
141 /* YYSTYPE gets defined by %union */
142 static int parse_number PARAMS ((char *, int, int, YYSTYPE *));
145 %type <voidval> exp type_exp start variable
146 %type <tval> type typebase
147 %type <tvec> nonempty_typelist
148 /* %type <bval> block */
150 /* Fancy type parsing. */
151 %type <voidval> func_mod direct_abs_decl abs_decl
154 %token <typed_val> INT
157 /* Both NAME and TYPENAME tokens represent symbols in the input,
158 and both convey their data as strings.
159 But a TYPENAME is a string that happens to be defined as a typedef
160 or builtin type name (such as int or char)
161 and a NAME is any other symbol.
162 Contexts where this distinction is not important can use the
163 nonterminal "name", which matches either NAME or TYPENAME. */
165 %token <sval> STRING_LITERAL
166 %token <lval> BOOLEAN_LITERAL
168 %token <tsym> TYPENAME
170 %type <ssym> name_not_typename
171 %type <tsym> typename
173 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
174 but which would parse as a valid number in the current input radix.
175 E.g. "c" when input_radix==16. Depending on the parse, it will be
176 turned into a name or into a number. */
178 %token <ssym> NAME_OR_INT
183 /* Special type cases, put in to allow the parser to distinguish different
185 %token INT_KEYWORD INT_S2_KEYWORD LOGICAL_S1_KEYWORD LOGICAL_S2_KEYWORD
186 %token LOGICAL_KEYWORD REAL_KEYWORD REAL_S8_KEYWORD REAL_S16_KEYWORD
187 %token COMPLEX_S8_KEYWORD COMPLEX_S16_KEYWORD COMPLEX_S32_KEYWORD
188 %token BOOL_AND BOOL_OR BOOL_NOT
189 %token <lval> LAST REGNAME CHARACTER
191 %token <ivar> VARIABLE
193 %token <opcode> ASSIGN_MODIFY
197 %right '=' ASSIGN_MODIFY
206 %left LESSTHAN GREATERTHAN LEQ GEQ
222 { write_exp_elt_opcode(OP_TYPE);
223 write_exp_elt_type($1);
224 write_exp_elt_opcode(OP_TYPE); }
231 /* Expressions, not including the comma operator. */
232 exp : '*' exp %prec UNARY
233 { write_exp_elt_opcode (UNOP_IND); }
235 exp : '&' exp %prec UNARY
236 { write_exp_elt_opcode (UNOP_ADDR); }
238 exp : '-' exp %prec UNARY
239 { write_exp_elt_opcode (UNOP_NEG); }
242 exp : BOOL_NOT exp %prec UNARY
243 { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
246 exp : '~' exp %prec UNARY
247 { write_exp_elt_opcode (UNOP_COMPLEMENT); }
250 exp : SIZEOF exp %prec UNARY
251 { write_exp_elt_opcode (UNOP_SIZEOF); }
254 /* No more explicit array operators, we treat everything in F77 as
255 a function call. The disambiguation as to whether we are
256 doing a subscript operation or a function call is done
260 { start_arglist (); }
262 { write_exp_elt_opcode (OP_F77_UNDETERMINED_ARGLIST);
263 write_exp_elt_longcst ((LONGEST) end_arglist ());
264 write_exp_elt_opcode (OP_F77_UNDETERMINED_ARGLIST); }
277 arglist : arglist ',' exp %prec ABOVE_COMMA
281 substring: exp ':' exp %prec ABOVE_COMMA
286 complexnum: exp ',' exp
290 exp : '(' complexnum ')'
291 { write_exp_elt_opcode(OP_COMPLEX); }
294 exp : '(' type ')' exp %prec UNARY
295 { write_exp_elt_opcode (UNOP_CAST);
296 write_exp_elt_type ($2);
297 write_exp_elt_opcode (UNOP_CAST); }
300 /* Binary operators in order of decreasing precedence. */
303 { write_exp_elt_opcode (BINOP_REPEAT); }
307 { write_exp_elt_opcode (BINOP_MUL); }
311 { write_exp_elt_opcode (BINOP_DIV); }
315 { write_exp_elt_opcode (BINOP_REM); }
319 { write_exp_elt_opcode (BINOP_ADD); }
323 { write_exp_elt_opcode (BINOP_SUB); }
327 { write_exp_elt_opcode (BINOP_LSH); }
331 { write_exp_elt_opcode (BINOP_RSH); }
335 { write_exp_elt_opcode (BINOP_EQUAL); }
338 exp : exp NOTEQUAL exp
339 { write_exp_elt_opcode (BINOP_NOTEQUAL); }
343 { write_exp_elt_opcode (BINOP_LEQ); }
347 { write_exp_elt_opcode (BINOP_GEQ); }
350 exp : exp LESSTHAN exp
351 { write_exp_elt_opcode (BINOP_LESS); }
354 exp : exp GREATERTHAN exp
355 { write_exp_elt_opcode (BINOP_GTR); }
359 { write_exp_elt_opcode (BINOP_BITWISE_AND); }
363 { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
367 { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
370 exp : exp BOOL_AND exp
371 { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
375 exp : exp BOOL_OR exp
376 { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
380 { write_exp_elt_opcode (BINOP_ASSIGN); }
383 exp : exp ASSIGN_MODIFY exp
384 { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
385 write_exp_elt_opcode ($2);
386 write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
390 { write_exp_elt_opcode (OP_LONG);
391 write_exp_elt_type ($1.type);
392 write_exp_elt_longcst ((LONGEST)($1.val));
393 write_exp_elt_opcode (OP_LONG); }
398 parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
399 write_exp_elt_opcode (OP_LONG);
400 write_exp_elt_type (val.typed_val.type);
401 write_exp_elt_longcst ((LONGEST)val.typed_val.val);
402 write_exp_elt_opcode (OP_LONG); }
406 { write_exp_elt_opcode (OP_DOUBLE);
407 write_exp_elt_type (builtin_type_f_real_s8);
408 write_exp_elt_dblcst ($1);
409 write_exp_elt_opcode (OP_DOUBLE); }
416 { write_exp_elt_opcode (OP_LAST);
417 write_exp_elt_longcst ((LONGEST) $1);
418 write_exp_elt_opcode (OP_LAST); }
422 { write_exp_elt_opcode (OP_REGISTER);
423 write_exp_elt_longcst ((LONGEST) $1);
424 write_exp_elt_opcode (OP_REGISTER); }
428 { write_exp_elt_opcode (OP_INTERNALVAR);
429 write_exp_elt_intern ($1);
430 write_exp_elt_opcode (OP_INTERNALVAR); }
433 exp : SIZEOF '(' type ')' %prec UNARY
434 { write_exp_elt_opcode (OP_LONG);
435 write_exp_elt_type (builtin_type_f_integer);
436 write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
437 write_exp_elt_opcode (OP_LONG); }
440 exp : BOOLEAN_LITERAL
441 { write_exp_elt_opcode (OP_BOOL);
442 write_exp_elt_longcst ((LONGEST) $1);
443 write_exp_elt_opcode (OP_BOOL);
449 write_exp_elt_opcode (OP_STRING);
450 write_exp_string ($1);
451 write_exp_elt_opcode (OP_STRING);
455 variable: name_not_typename
456 { struct symbol *sym = $1.sym;
460 if (symbol_read_needs_frame (sym))
462 if (innermost_block == 0 ||
463 contained_in (block_found,
465 innermost_block = block_found;
467 write_exp_elt_opcode (OP_VAR_VALUE);
468 /* We want to use the selected frame, not
469 another more inner frame which happens to
470 be in the same block. */
471 write_exp_elt_block (NULL);
472 write_exp_elt_sym (sym);
473 write_exp_elt_opcode (OP_VAR_VALUE);
478 struct minimal_symbol *msymbol;
479 register char *arg = copy_name ($1.stoken);
482 lookup_minimal_symbol (arg, NULL, NULL);
485 write_exp_msymbol (msymbol,
486 lookup_function_type (builtin_type_int),
489 else if (!have_full_symbols () && !have_partial_symbols ())
490 error ("No symbol table is loaded. Use the \"file\" command.");
492 error ("No symbol \"%s\" in current context.",
493 copy_name ($1.stoken));
505 /* This is where the interesting stuff happens. */
508 struct type *follow_type = $1;
509 struct type *range_type;
518 follow_type = lookup_pointer_type (follow_type);
521 follow_type = lookup_reference_type (follow_type);
524 array_size = pop_type_int ();
525 if (array_size != -1)
528 create_range_type ((struct type *) NULL,
529 builtin_type_f_integer, 0,
532 create_array_type ((struct type *) NULL,
533 follow_type, range_type);
536 follow_type = lookup_pointer_type (follow_type);
539 follow_type = lookup_function_type (follow_type);
547 { push_type (tp_pointer); $$ = 0; }
549 { push_type (tp_pointer); $$ = $2; }
551 { push_type (tp_reference); $$ = 0; }
553 { push_type (tp_reference); $$ = $2; }
557 direct_abs_decl: '(' abs_decl ')'
559 | direct_abs_decl func_mod
560 { push_type (tp_function); }
562 { push_type (tp_function); }
567 | '(' nonempty_typelist ')'
568 { free ((PTR)$2); $$ = 0; }
571 typebase /* Implements (approximately): (type-qualifier)* type-specifier */
575 { $$ = builtin_type_f_integer; }
577 { $$ = builtin_type_f_integer_s2; }
579 { $$ = builtin_type_f_character; }
581 { $$ = builtin_type_f_logical;}
583 { $$ = builtin_type_f_logical_s2;}
585 { $$ = builtin_type_f_logical_s1;}
587 { $$ = builtin_type_f_real;}
589 { $$ = builtin_type_f_real_s8;}
591 { $$ = builtin_type_f_real_s16;}
593 { $$ = builtin_type_f_complex_s8;}
594 | COMPLEX_S16_KEYWORD
595 { $$ = builtin_type_f_complex_s16;}
596 | COMPLEX_S32_KEYWORD
597 { $$ = builtin_type_f_complex_s32;}
605 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
606 $<ivec>$[0] = 1; /* Number of types in vector */
609 | nonempty_typelist ',' type
610 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
611 $$ = (struct type **) realloc ((char *) $1, len);
612 $$[$<ivec>$[0]] = $3;
624 name_not_typename : NAME
625 /* These would be useful if name_not_typename was useful, but it is just
626 a fake for "variable", so these cause reduce/reduce conflicts because
627 the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
628 =exp) or just an exp. If name_not_typename was ever used in an lvalue
629 context where only a name could occur, this might be useful.
636 /* Take care of parsing a number (anything that starts with a digit).
637 Set yylval and return the token type; update lexptr.
638 LEN is the number of characters in it. */
640 /*** Needs some error checking for the float case ***/
643 parse_number (p, len, parsed_float, putithere)
649 register LONGEST n = 0;
650 register LONGEST prevn = 0;
653 register int base = input_radix;
656 unsigned LONGEST high_bit;
657 struct type *signed_type;
658 struct type *unsigned_type;
662 /* It's a float since it contains a point or an exponent. */
663 /* [dD] is not understood as an exponent by atof, change it to 'e'. */
667 for (tmp2 = tmp; *tmp2; ++tmp2)
668 if (*tmp2 == 'd' || *tmp2 == 'D')
670 putithere->dval = atof (tmp);
675 /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
709 if (c >= 'A' && c <= 'Z')
711 if (c != 'l' && c != 'u')
713 if (c >= '0' && c <= '9')
717 if (base > 10 && c >= 'a' && c <= 'f')
718 n += i = c - 'a' + 10;
719 else if (len == 0 && c == 'l')
721 else if (len == 0 && c == 'u')
724 return ERROR; /* Char not a digit */
727 return ERROR; /* Invalid digit in this base */
729 /* Portably test for overflow (only works for nonzero values, so make
730 a second check for zero). */
731 if ((prevn >= n) && n != 0)
732 unsigned_p=1; /* Try something unsigned */
733 /* If range checking enabled, portably test for unsigned overflow. */
734 if (RANGE_CHECK && n != 0)
736 if ((unsigned_p && (unsigned)prevn >= (unsigned)n))
737 range_error("Overflow on numeric constant.");
742 /* If the number is too big to be an int, or it's got an l suffix
743 then it's a long. Work out if this has to be a long by
744 shifting right and and seeing if anything remains, and the
745 target int size is different to the target long size.
747 In the expression below, we could have tested
748 (n >> TARGET_INT_BIT)
749 to see if it was zero,
750 but too many compilers warn about that, when ints and longs
751 are the same size. So we shift it twice, with fewer bits
752 each time, for the same result. */
754 if ((TARGET_INT_BIT != TARGET_LONG_BIT
755 && ((n >> 2) >> (TARGET_INT_BIT-2))) /* Avoid shift warning */
758 high_bit = ((unsigned LONGEST)1) << (TARGET_LONG_BIT-1);
759 unsigned_type = builtin_type_unsigned_long;
760 signed_type = builtin_type_long;
764 high_bit = ((unsigned LONGEST)1) << (TARGET_INT_BIT-1);
765 unsigned_type = builtin_type_unsigned_int;
766 signed_type = builtin_type_int;
769 putithere->typed_val.val = n;
771 /* If the high bit of the worked out type is set then this number
772 has to be unsigned. */
774 if (unsigned_p || (n & high_bit))
775 putithere->typed_val.type = unsigned_type;
777 putithere->typed_val.type = signed_type;
786 enum exp_opcode opcode;
789 static const struct token dot_ops[] =
791 { ".and.", BOOL_AND, BINOP_END },
792 { ".AND.", BOOL_AND, BINOP_END },
793 { ".or.", BOOL_OR, BINOP_END },
794 { ".OR.", BOOL_OR, BINOP_END },
795 { ".not.", BOOL_NOT, BINOP_END },
796 { ".NOT.", BOOL_NOT, BINOP_END },
797 { ".eq.", EQUAL, BINOP_END },
798 { ".EQ.", EQUAL, BINOP_END },
799 { ".eqv.", EQUAL, BINOP_END },
800 { ".NEQV.", NOTEQUAL, BINOP_END },
801 { ".neqv.", NOTEQUAL, BINOP_END },
802 { ".EQV.", EQUAL, BINOP_END },
803 { ".ne.", NOTEQUAL, BINOP_END },
804 { ".NE.", NOTEQUAL, BINOP_END },
805 { ".le.", LEQ, BINOP_END },
806 { ".LE.", LEQ, BINOP_END },
807 { ".ge.", GEQ, BINOP_END },
808 { ".GE.", GEQ, BINOP_END },
809 { ".gt.", GREATERTHAN, BINOP_END },
810 { ".GT.", GREATERTHAN, BINOP_END },
811 { ".lt.", LESSTHAN, BINOP_END },
812 { ".LT.", LESSTHAN, BINOP_END },
816 struct f77_boolean_val
822 static const struct f77_boolean_val boolean_values[] =
831 static const struct token f77_keywords[] =
833 { "complex_16", COMPLEX_S16_KEYWORD, BINOP_END },
834 { "complex_32", COMPLEX_S32_KEYWORD, BINOP_END },
835 { "character", CHARACTER, BINOP_END },
836 { "integer_2", INT_S2_KEYWORD, BINOP_END },
837 { "logical_1", LOGICAL_S1_KEYWORD, BINOP_END },
838 { "logical_2", LOGICAL_S2_KEYWORD, BINOP_END },
839 { "complex_8", COMPLEX_S8_KEYWORD, BINOP_END },
840 { "integer", INT_KEYWORD, BINOP_END },
841 { "logical", LOGICAL_KEYWORD, BINOP_END },
842 { "real_16", REAL_S16_KEYWORD, BINOP_END },
843 { "complex", COMPLEX_S8_KEYWORD, BINOP_END },
844 { "sizeof", SIZEOF, BINOP_END },
845 { "real_8", REAL_S8_KEYWORD, BINOP_END },
846 { "real", REAL_KEYWORD, BINOP_END },
850 /* Implementation of a dynamically expandable buffer for processing input
851 characters acquired through lexptr and building a value to return in
852 yylval. Ripped off from ch-exp.y */
854 static char *tempbuf; /* Current buffer contents */
855 static int tempbufsize; /* Size of allocated buffer */
856 static int tempbufindex; /* Current index into buffer */
858 #define GROWBY_MIN_SIZE 64 /* Minimum amount to grow buffer by */
860 #define CHECKBUF(size) \
862 if (tempbufindex + (size) >= tempbufsize) \
864 growbuf_by_size (size); \
869 /* Grow the static temp buffer if necessary, including allocating the first one
873 growbuf_by_size (count)
878 growby = max (count, GROWBY_MIN_SIZE);
879 tempbufsize += growby;
881 tempbuf = (char *) malloc (tempbufsize);
883 tempbuf = (char *) realloc (tempbuf, tempbufsize);
886 /* Blatantly ripped off from ch-exp.y. This routine recognizes F77
889 Recognize a string literal. A string literal is a nonzero sequence
890 of characters enclosed in matching single quotes, except that
891 a single character inside single quotes is a character literal, which
892 we reject as a string literal. To embed the terminator character inside
893 a string, it is simply doubled (I.E. 'this''is''one''string') */
896 match_string_literal ()
898 char *tokptr = lexptr;
900 for (tempbufindex = 0, tokptr++; *tokptr != '\0'; tokptr++)
903 if (*tokptr == *lexptr)
905 if (*(tokptr + 1) == *lexptr)
910 tempbuf[tempbufindex++] = *tokptr;
912 if (*tokptr == '\0' /* no terminator */
913 || tempbufindex == 0) /* no string */
917 tempbuf[tempbufindex] = '\0';
918 yylval.sval.ptr = tempbuf;
919 yylval.sval.length = tempbufindex;
921 return STRING_LITERAL;
925 /* Read one token, getting characters through lexptr. */
932 unsigned int i,token;
939 /* First of all, let us make sure we are not dealing with the
940 special tokens .true. and .false. which evaluate to 1 and 0. */
944 for (i = 0; boolean_values[i].name != NULL; i++)
946 if STREQN (tokstart, boolean_values[i].name,
947 strlen (boolean_values[i].name))
949 lexptr += strlen (boolean_values[i].name);
950 yylval.lval = boolean_values[i].value;
951 return BOOLEAN_LITERAL;
956 /* See if it is a special .foo. operator */
958 for (i = 0; dot_ops[i].operator != NULL; i++)
959 if (STREQN (tokstart, dot_ops[i].operator, strlen (dot_ops[i].operator)))
961 lexptr += strlen (dot_ops[i].operator);
962 yylval.opcode = dot_ops[i].opcode;
963 return dot_ops[i].token;
966 switch (c = *tokstart)
978 token = match_string_literal ();
989 if (paren_depth == 0)
996 if (comma_terminates && paren_depth == 0)
1002 /* Might be a floating point number. */
1003 if (lexptr[1] < '0' || lexptr[1] > '9')
1004 goto symbol; /* Nope, must be a symbol. */
1005 /* FALL THRU into number case. */
1018 /* It's a number. */
1019 int got_dot = 0, got_e = 0, got_d = 0, toktype;
1020 register char *p = tokstart;
1021 int hex = input_radix > 10;
1023 if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1028 else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1036 if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1037 got_dot = got_e = 1;
1038 else if (!hex && !got_d && (*p == 'd' || *p == 'D'))
1039 got_dot = got_d = 1;
1040 else if (!hex && !got_dot && *p == '.')
1042 else if (((got_e && (p[-1] == 'e' || p[-1] == 'E'))
1043 || (got_d && (p[-1] == 'd' || p[-1] == 'D')))
1044 && (*p == '-' || *p == '+'))
1045 /* This is the sign of the exponent, not the end of the
1048 /* We will take any letters or digits. parse_number will
1049 complain if past the radix, or if L or U are not final. */
1050 else if ((*p < '0' || *p > '9')
1051 && ((*p < 'a' || *p > 'z')
1052 && (*p < 'A' || *p > 'Z')))
1055 toktype = parse_number (tokstart, p - tokstart, got_dot|got_e|got_d,
1057 if (toktype == ERROR)
1059 char *err_copy = (char *) alloca (p - tokstart + 1);
1061 memcpy (err_copy, tokstart, p - tokstart);
1062 err_copy[p - tokstart] = 0;
1063 error ("Invalid number \"%s\".", err_copy);
1094 if (!(c == '_' || c == '$'
1095 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1096 /* We must have come across a bad character (e.g. ';'). */
1097 error ("Invalid character '%c' in expression.", c);
1100 for (c = tokstart[namelen];
1101 (c == '_' || c == '$' || (c >= '0' && c <= '9')
1102 || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
1103 c = tokstart[++namelen]);
1105 /* The token "if" terminates the expression and is NOT
1106 removed from the input stream. */
1108 if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
1113 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
1114 and $$digits (equivalent to $<-digits> if you could type that).
1115 Make token type LAST, and put the number (the digits) in yylval. */
1117 if (*tokstart == '$')
1119 register int negate = 0;
1122 /* Double dollar means negate the number and add -1 as well.
1123 Thus $$ alone means -1. */
1124 if (namelen >= 2 && tokstart[1] == '$')
1131 /* Just dollars (one or two) */
1132 yylval.lval = - negate;
1135 /* Is the rest of the token digits? */
1136 for (; c < namelen; c++)
1137 if (!(tokstart[c] >= '0' && tokstart[c] <= '9'))
1141 yylval.lval = atoi (tokstart + 1 + negate);
1143 yylval.lval = - yylval.lval;
1148 /* Handle tokens that refer to machine registers:
1149 $ followed by a register name. */
1151 if (*tokstart == '$') {
1152 for (c = 0; c < NUM_REGS; c++)
1153 if (namelen - 1 == strlen (reg_names[c])
1154 && STREQN (tokstart + 1, reg_names[c], namelen - 1))
1159 for (c = 0; c < num_std_regs; c++)
1160 if (namelen - 1 == strlen (std_regs[c].name)
1161 && STREQN (tokstart + 1, std_regs[c].name, namelen - 1))
1163 yylval.lval = std_regs[c].regnum;
1167 /* Catch specific keywords. */
1169 for (i = 0; f77_keywords[i].operator != NULL; i++)
1170 if (STREQN(tokstart, f77_keywords[i].operator,
1171 strlen(f77_keywords[i].operator)))
1173 /* lexptr += strlen(f77_keywords[i].operator); */
1174 yylval.opcode = f77_keywords[i].opcode;
1175 return f77_keywords[i].token;
1178 yylval.sval.ptr = tokstart;
1179 yylval.sval.length = namelen;
1181 /* Any other names starting in $ are debugger internal variables. */
1183 if (*tokstart == '$')
1185 yylval.ivar = lookup_internalvar (copy_name (yylval.sval) + 1);
1189 /* Use token-type TYPENAME for symbols that happen to be defined
1190 currently as names of types; NAME for other symbols.
1191 The caller is not constrained to care about the distinction. */
1193 char *tmp = copy_name (yylval.sval);
1195 int is_a_field_of_this = 0;
1198 sym = lookup_symbol (tmp, expression_context_block,
1200 current_language->la_language == language_cplus
1201 ? &is_a_field_of_this : NULL,
1203 if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1205 yylval.tsym.type = SYMBOL_TYPE (sym);
1208 if ((yylval.tsym.type = lookup_primitive_typename (tmp)) != 0)
1211 /* Input names that aren't symbols but ARE valid hex numbers,
1212 when the input radix permits them, can be names or numbers
1213 depending on the parse. Note we support radixes > 16 here. */
1215 && ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10)
1216 || (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1218 YYSTYPE newlval; /* Its value is ignored. */
1219 hextype = parse_number (tokstart, namelen, 0, &newlval);
1222 yylval.ssym.sym = sym;
1223 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1228 /* Any other kind of symbol */
1229 yylval.ssym.sym = sym;
1230 yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1239 error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);