1 /* FLEX lexer for Ada expressions, for GDB.
2 Copyright (C) 1994, 1997-1998, 2000-2003, 2007-2012 Free Software
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 /*----------------------------------------------------------------------*/
22 /* The converted version of this file is to be included in ada-exp.y, */
23 /* the Ada parser for gdb. The function yylex obtains characters from */
24 /* the global pointer lexptr. It returns a syntactic category for */
25 /* each successive token and places a semantic value into yylval */
26 /* (ada-lval), defined by the parser. */
29 NUM10 ({DIG}({DIG}|_)*)
31 NUM16 ({HEXDIG}({HEXDIG}|_)*)
34 ID ({LETTER}({LETTER}|{DIG})*|"<"{LETTER}({LETTER}|{DIG})*">")
37 GRAPHIC [a-z0-9 #&'()*+,-./:;<>=_|!$%?@\[\]\\^`{}~]
38 OPER ([-+*/=<>&]|"<="|">="|"**"|"/="|"and"|"or"|"xor"|"not"|"mod"|"rem"|"abs")
45 #define NUMERAL_WIDTH 256
46 #define LONGEST_SIGN ((ULONGEST) 1 << (sizeof(LONGEST) * HOST_CHAR_BIT - 1))
48 /* Temporary staging for numeric literals. */
49 static char numbuf[NUMERAL_WIDTH];
50 static void canonicalizeNumeral (char *s1, const char *);
51 static struct stoken processString (const char*, int);
52 static int processInt (const char *, const char *, const char *);
53 static int processReal (const char *);
54 static struct stoken processId (const char *, int);
55 static int processAttribute (const char *);
56 static int find_dot_all (const char *);
59 #define YY_DECL static int yylex ( void )
61 /* Flex generates a static function "input" which is not used.
62 Defining YY_NO_INPUT comments it out. */
66 #define YY_INPUT(BUF, RESULT, MAX_SIZE) \
67 if ( *lexptr == '\000' ) \
76 static int find_dot_all (const char *);
80 %option case-insensitive interactive nodefault
88 "--".* { yyterminate(); }
91 canonicalizeNumeral (numbuf, yytext);
92 return processInt (NULL, numbuf, strrchr(numbuf, 'e')+1);
96 canonicalizeNumeral (numbuf, yytext);
97 return processInt (NULL, numbuf, NULL);
100 {NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#"{POSEXP} {
101 canonicalizeNumeral (numbuf, yytext);
102 return processInt (numbuf,
103 strchr (numbuf, '#') + 1,
104 strrchr(numbuf, '#') + 1);
107 {NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#" {
108 canonicalizeNumeral (numbuf, yytext);
109 return processInt (numbuf, strchr (numbuf, '#') + 1, NULL);
113 canonicalizeNumeral (numbuf, yytext+2);
114 return processInt ("16#", numbuf, NULL);
118 {NUM10}"."{NUM10}{EXP} {
119 canonicalizeNumeral (numbuf, yytext);
120 return processReal (numbuf);
124 canonicalizeNumeral (numbuf, yytext);
125 return processReal (numbuf);
128 {NUM10}"#"{NUM16}"."{NUM16}"#"{EXP} {
129 error (_("Based real literals not implemented yet."));
132 {NUM10}"#"{NUM16}"."{NUM16}"#" {
133 error (_("Based real literals not implemented yet."));
136 <INITIAL>"'"({GRAPHIC}|\")"'" {
137 yylval.typed_val.type = type_char ();
138 yylval.typed_val.val = yytext[1];
142 <INITIAL>"'[\""{HEXDIG}{2}"\"]'" {
144 yylval.typed_val.type = type_char ();
145 sscanf (yytext+3, "%2x", &v);
146 yylval.typed_val.val = v;
150 \"({GRAPHIC}|"[\""({HEXDIG}{2}|\")"\"]")*\" {
151 yylval.sval = processString (yytext+1, yyleng-2);
156 error (_("ill-formed or non-terminated string literal"));
161 while (*lexptr != 'i' && *lexptr != 'I')
168 /* This keyword signals the end of the expression and
169 will be processed separately. */
170 while (*lexptr != 't' && *lexptr != 'T')
179 and { return _AND_; }
180 else { return ELSE; }
185 null { return NULL_PTR; }
187 others { return OTHERS; }
189 then { return THEN; }
192 /* BOOLEAN "KEYWORDS" */
194 /* True and False are not keywords in Ada, but rather enumeration constants.
195 However, the boolean type is no longer represented as an enum, so True
196 and False are no longer defined in symbol tables. We compromise by
197 making them keywords (when bare). */
199 true { return TRUEKEYWORD; }
200 false { return FALSEKEYWORD; }
204 {TICK}[a-zA-Z][a-zA-Z]+ { return processAttribute (yytext+1); }
208 "=>" { return ARROW; }
209 ".." { return DOTDOT; }
210 "**" { return STARSTAR; }
211 ":=" { return ASSIGN; }
212 "/=" { return NOTEQUAL; }
216 <BEFORE_QUAL_QUOTE>"'" { BEGIN INITIAL; return '\''; }
218 [-&*+./:<>=|;\[\]] { return yytext[0]; }
220 "," { if (paren_depth == 0 && comma_terminates)
230 "(" { paren_depth += 1; return '('; }
231 ")" { if (paren_depth == 0)
244 "."{WHITE}*all { return DOT_ALL; }
247 yylval.sval = processId (yytext+1, yyleng-1);
251 {ID}({WHITE}*"."{WHITE}*({ID}|\"{OPER}\"))*(" "*"'")? {
252 int all_posn = find_dot_all (yytext);
254 if (all_posn == -1 && yytext[yyleng-1] == '\'')
256 BEGIN BEFORE_QUAL_QUOTE;
259 else if (all_posn >= 0)
261 yylval.sval = processId (yytext, yyleng);
266 /* GDB EXPRESSION CONSTRUCTS */
268 "'"[^']+"'"{WHITE}*:: {
270 yylval.sval = processId (yytext, yyleng);
274 "::" { return COLONCOLON; }
276 [{}@] { return yytext[0]; }
278 /* REGISTERS AND GDB CONVENIENCE VARIABLES */
280 "$"({LETTER}|{DIG}|"$")* {
281 yylval.sval.ptr = yytext;
282 yylval.sval.length = yyleng;
283 return SPECIAL_VARIABLE;
286 /* CATCH-ALL ERROR CASE */
288 . { error (_("Invalid character '%s' in expression."), yytext); }
292 #include "gdb_string.h"
294 /* Initialize the lexer for processing new expression. */
297 lexer_init (FILE *inp)
304 /* Copy S2 to S1, removing all underscores, and downcasing all letters. */
307 canonicalizeNumeral (char *s1, const char *s2)
309 for (; *s2 != '\000'; s2 += 1)
320 /* Interprets the prefix of NUM that consists of digits of the given BASE
321 as an integer of that BASE, with the string EXP as an exponent.
322 Puts value in yylval, and returns INT, if the string is valid. Causes
323 an error if the number is improperly formated. BASE, if NULL, defaults
324 to "10", and EXP to "1". The EXP does not contain a leading 'e' or 'E'.
328 processInt (const char *base0, const char *num0, const char *exp0)
340 base = strtol (base0, (char **) NULL, 10);
341 if (base < 2 || base > 16)
342 error (_("Invalid base: %d."), base);
348 exp = strtol(exp0, (char **) NULL, 10);
351 result = strtoulst (num0, (const char **) &trailer, base);
353 error (_("Integer literal out of range"));
354 if (isxdigit(*trailer))
355 error (_("Invalid digit `%c' in based literal"), *trailer);
359 if (result > (ULONG_MAX / base))
360 error (_("Integer literal out of range"));
365 if ((result >> (gdbarch_int_bit (parse_gdbarch)-1)) == 0)
366 yylval.typed_val.type = type_int ();
367 else if ((result >> (gdbarch_long_bit (parse_gdbarch)-1)) == 0)
368 yylval.typed_val.type = type_long ();
369 else if (((result >> (gdbarch_long_bit (parse_gdbarch)-1)) >> 1) == 0)
371 /* We have a number representable as an unsigned integer quantity.
372 For consistency with the C treatment, we will treat it as an
373 anonymous modular (unsigned) quantity. Alas, the types are such
374 that we need to store .val as a signed quantity. Sorry
375 for the mess, but C doesn't officially guarantee that a simple
376 assignment does the trick (no, it doesn't; read the reference manual).
378 yylval.typed_val.type
379 = builtin_type (parse_gdbarch)->builtin_unsigned_long;
380 if (result & LONGEST_SIGN)
381 yylval.typed_val.val =
382 (LONGEST) (result & ~LONGEST_SIGN)
383 - (LONGEST_SIGN>>1) - (LONGEST_SIGN>>1);
385 yylval.typed_val.val = (LONGEST) result;
389 yylval.typed_val.type = type_long_long ();
391 yylval.typed_val.val = (LONGEST) result;
396 processReal (const char *num0)
398 sscanf (num0, "%" DOUBLEST_SCAN_FORMAT, &yylval.typed_val_float.dval);
400 yylval.typed_val_float.type = type_float ();
401 if (sizeof(DOUBLEST) >= gdbarch_double_bit (parse_gdbarch)
403 yylval.typed_val_float.type = type_double ();
404 if (sizeof(DOUBLEST) >= gdbarch_long_double_bit (parse_gdbarch)
406 yylval.typed_val_float.type = type_long_double ();
412 /* Store a canonicalized version of NAME0[0..LEN-1] in yylval.ssym. The
413 resulting string is valid until the next call to ada_parse. If
414 NAME0 contains the substring "___", it is assumed to be already
415 encoded and the resulting name is equal to it. Otherwise, it differs
417 + Characters between '...' or <...> are transfered verbatim to
419 + <, >, and trailing "'" characters in quoted sequences are removed
420 (a leading quote is preserved to indicate that the name is not to be
422 + Unquoted whitespace is removed.
423 + Unquoted alphabetic characters are mapped to lower case.
424 Result is returned as a struct stoken, but for convenience, the string
425 is also null-terminated. Result string valid until the next call of
429 processId (const char *name0, int len)
431 char *name = obstack_alloc (&temp_parse_space, len + 11);
433 struct stoken result;
436 while (len > 0 && isspace (name0[len-1]))
439 if (strstr (name0, "___") != NULL)
441 strncpy (name, name0, len);
450 if (isalnum (name0[i0]))
452 name[i] = tolower (name0[i0]);
455 else switch (name0[i0])
470 while (i0 < len && name0[i0] != '\'');
475 while (i0 < len && name0[i0] != '>')
490 /* Return TEXT[0..LEN-1], a string literal without surrounding quotes,
491 with special hex character notations replaced with characters.
492 Result valid until the next call to ada_parse. */
495 processString (const char *text, int len)
499 const char *lim = text + len;
500 struct stoken result;
502 q = result.ptr = obstack_alloc (&temp_parse_space, len);
506 if (p[0] == '[' && p[1] == '"' && p+2 < lim)
508 if (p[2] == '"') /* "...["""]... */
516 sscanf (p+2, "%2x", &chr);
526 result.length = q - result.ptr;
530 /* Returns the position within STR of the '.' in a
531 '.{WHITE}*all' component of a dotted name, or -1 if there is none.
532 Note: we actually don't need this routine, since 'all' can never be an
533 Ada identifier. Thus, looking up foo.all or foo.all.x as a name
534 must fail, and will eventually be interpreted as (foo).all or
535 (foo).all.x. However, this does avoid an extraneous lookup. */
538 find_dot_all (const char *str)
541 for (i = 0; str[i] != '\000'; i += 1)
548 while (isspace (str[i]));
549 if (strncmp (str+i, "all", 3) == 0
550 && ! isalnum (str[i+3]) && str[i+3] != '_')
557 /* Returns non-zero iff string SUBSEQ matches a subsequence of STR, ignoring
561 subseqMatch (const char *subseq, const char *str)
563 if (subseq[0] == '\0')
565 else if (str[0] == '\0')
567 else if (tolower (subseq[0]) == tolower (str[0]))
568 return subseqMatch (subseq+1, str+1) || subseqMatch (subseq, str+1);
570 return subseqMatch (subseq, str+1);
574 static struct { const char *name; int code; }
576 { "address", TICK_ADDRESS },
577 { "unchecked_access", TICK_ACCESS },
578 { "unrestricted_access", TICK_ACCESS },
579 { "access", TICK_ACCESS },
580 { "first", TICK_FIRST },
581 { "last", TICK_LAST },
582 { "length", TICK_LENGTH },
585 { "modulus", TICK_MODULUS },
587 { "range", TICK_RANGE },
588 { "size", TICK_SIZE },
594 /* Return the syntactic code corresponding to the attribute name or
598 processAttribute (const char *str)
602 for (i = 0; attributes[i].code != -1; i += 1)
603 if (strcasecmp (str, attributes[i].name) == 0)
604 return attributes[i].code;
606 for (i = 0, k = -1; attributes[i].code != -1; i += 1)
607 if (subseqMatch (str, attributes[i].name))
612 error (_("ambiguous attribute name: `%s'"), str);
615 error (_("unrecognized attribute: `%s'"), str);
617 return attributes[k].code;
626 /* Dummy definition to suppress warnings about unused static definitions. */
627 typedef void (*dummy_function) ();
628 dummy_function ada_flex_use[] =
630 (dummy_function) yyunput