1 /* FLEX lexer for Ada expressions, for GDB.
2 Copyright (C) 1994, 1997, 1998, 2000, 2001, 2002, 2003, 2007, 2008
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 2 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, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
22 /*----------------------------------------------------------------------*/
24 /* The converted version of this file is to be included in ada-exp.y, */
25 /* the Ada parser for gdb. The function yylex obtains characters from */
26 /* the global pointer lexptr. It returns a syntactic category for */
27 /* each successive token and places a semantic value into yylval */
28 /* (ada-lval), defined by the parser. */
31 NUM10 ({DIG}({DIG}|_)*)
33 NUM16 ({HEXDIG}({HEXDIG}|_)*)
36 ID ({LETTER}({LETTER}|{DIG})*|"<"{LETTER}({LETTER}|{DIG})*">")
39 GRAPHIC [a-z0-9 #&'()*+,-./:;<>=_|!$%?@\[\]\\^`{}~]
40 OPER ([-+*/=<>&]|"<="|">="|"**"|"/="|"and"|"or"|"xor"|"not"|"mod"|"rem"|"abs")
47 #define NUMERAL_WIDTH 256
48 #define LONGEST_SIGN ((ULONGEST) 1 << (sizeof(LONGEST) * HOST_CHAR_BIT - 1))
50 /* Temporary staging for numeric literals. */
51 static char numbuf[NUMERAL_WIDTH];
52 static void canonicalizeNumeral (char *s1, const char *);
53 static struct stoken processString (const char*, int);
54 static int processInt (const char *, const char *, const char *);
55 static int processReal (const char *);
56 static struct stoken processId (const char *, int);
57 static int processAttribute (const char *);
58 static int find_dot_all (const char *);
61 #define YY_DECL static int yylex ( void )
64 #define YY_INPUT(BUF, RESULT, MAX_SIZE) \
65 if ( *lexptr == '\000' ) \
74 static int find_dot_all (const char *);
78 %option case-insensitive interactive nodefault
86 "--".* { yyterminate(); }
89 canonicalizeNumeral (numbuf, yytext);
90 return processInt (NULL, numbuf, strrchr(numbuf, 'e')+1);
94 canonicalizeNumeral (numbuf, yytext);
95 return processInt (NULL, numbuf, NULL);
98 {NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#"{POSEXP} {
99 canonicalizeNumeral (numbuf, yytext);
100 return processInt (numbuf,
101 strchr (numbuf, '#') + 1,
102 strrchr(numbuf, '#') + 1);
105 {NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#" {
106 canonicalizeNumeral (numbuf, yytext);
107 return processInt (numbuf, strchr (numbuf, '#') + 1, NULL);
111 canonicalizeNumeral (numbuf, yytext+2);
112 return processInt ("16#", numbuf, NULL);
116 {NUM10}"."{NUM10}{EXP} {
117 canonicalizeNumeral (numbuf, yytext);
118 return processReal (numbuf);
122 canonicalizeNumeral (numbuf, yytext);
123 return processReal (numbuf);
126 {NUM10}"#"{NUM16}"."{NUM16}"#"{EXP} {
127 error (_("Based real literals not implemented yet."));
130 {NUM10}"#"{NUM16}"."{NUM16}"#" {
131 error (_("Based real literals not implemented yet."));
134 <INITIAL>"'"({GRAPHIC}|\")"'" {
135 yylval.typed_val.type = type_char ();
136 yylval.typed_val.val = yytext[1];
140 <INITIAL>"'[\""{HEXDIG}{2}"\"]'" {
142 yylval.typed_val.type = type_char ();
143 sscanf (yytext+3, "%2x", &v);
144 yylval.typed_val.val = v;
148 \"({GRAPHIC}|"[\""({HEXDIG}{2}|\")"\"]")*\" {
149 yylval.sval = processString (yytext+1, yyleng-2);
154 error (_("ill-formed or non-terminated string literal"));
159 while (*lexptr != 'i' && *lexptr != 'I')
168 and { return _AND_; }
169 else { return ELSE; }
174 null { return NULL_PTR; }
176 others { return OTHERS; }
178 then { return THEN; }
183 {TICK}[a-zA-Z][a-zA-Z]+ { return processAttribute (yytext+1); }
187 "=>" { return ARROW; }
188 ".." { return DOTDOT; }
189 "**" { return STARSTAR; }
190 ":=" { return ASSIGN; }
191 "/=" { return NOTEQUAL; }
195 <BEFORE_QUAL_QUOTE>"'" { BEGIN INITIAL; return '\''; }
197 [-&*+./:<>=|;\[\]] { return yytext[0]; }
199 "," { if (paren_depth == 0 && comma_terminates)
209 "(" { paren_depth += 1; return '('; }
210 ")" { if (paren_depth == 0)
223 "."{WHITE}*all { return DOT_ALL; }
226 yylval.sval = processId (yytext+1, yyleng-1);
230 {ID}({WHITE}*"."{WHITE}*({ID}|\"{OPER}\"))*(" "*"'")? {
231 int all_posn = find_dot_all (yytext);
233 if (all_posn == -1 && yytext[yyleng-1] == '\'')
235 BEGIN BEFORE_QUAL_QUOTE;
238 else if (all_posn >= 0)
240 yylval.sval = processId (yytext, yyleng);
245 /* GDB EXPRESSION CONSTRUCTS */
247 "'"[^']+"'"{WHITE}*:: {
249 yylval.sval = processId (yytext, yyleng);
253 "::" { return COLONCOLON; }
255 [{}@] { return yytext[0]; }
257 /* REGISTERS AND GDB CONVENIENCE VARIABLES */
259 "$"({LETTER}|{DIG}|"$")* {
260 yylval.sval.ptr = yytext;
261 yylval.sval.length = yyleng;
262 return SPECIAL_VARIABLE;
265 /* CATCH-ALL ERROR CASE */
267 . { error (_("Invalid character '%s' in expression."), yytext); }
271 #include "gdb_string.h"
273 /* Initialize the lexer for processing new expression. */
276 lexer_init (FILE *inp)
283 /* Copy S2 to S1, removing all underscores, and downcasing all letters. */
286 canonicalizeNumeral (char *s1, const char *s2)
288 for (; *s2 != '\000'; s2 += 1)
299 /* Interprets the prefix of NUM that consists of digits of the given BASE
300 as an integer of that BASE, with the string EXP as an exponent.
301 Puts value in yylval, and returns INT, if the string is valid. Causes
302 an error if the number is improperly formated. BASE, if NULL, defaults
303 to "10", and EXP to "1". The EXP does not contain a leading 'e' or 'E'.
307 processInt (const char *base0, const char *num0, const char *exp0)
319 base = strtol (base0, (char **) NULL, 10);
320 if (base < 2 || base > 16)
321 error (_("Invalid base: %d."), base);
327 exp = strtol(exp0, (char **) NULL, 10);
330 result = strtoulst (num0, (const char **) &trailer, base);
332 error (_("Integer literal out of range"));
333 if (isxdigit(*trailer))
334 error (_("Invalid digit `%c' in based literal"), *trailer);
338 if (result > (ULONG_MAX / base))
339 error (_("Integer literal out of range"));
344 if ((result >> (gdbarch_int_bit (current_gdbarch)-1)) == 0)
345 yylval.typed_val.type = type_int ();
346 else if ((result >> (gdbarch_long_bit (current_gdbarch)-1)) == 0)
347 yylval.typed_val.type = type_long ();
348 else if (((result >> (gdbarch_long_bit (current_gdbarch)-1)) >> 1) == 0)
350 /* We have a number representable as an unsigned integer quantity.
351 For consistency with the C treatment, we will treat it as an
352 anonymous modular (unsigned) quantity. Alas, the types are such
353 that we need to store .val as a signed quantity. Sorry
354 for the mess, but C doesn't officially guarantee that a simple
355 assignment does the trick (no, it doesn't; read the reference manual).
357 yylval.typed_val.type = builtin_type_unsigned_long;
358 if (result & LONGEST_SIGN)
359 yylval.typed_val.val =
360 (LONGEST) (result & ~LONGEST_SIGN)
361 - (LONGEST_SIGN>>1) - (LONGEST_SIGN>>1);
363 yylval.typed_val.val = (LONGEST) result;
367 yylval.typed_val.type = type_long_long ();
369 yylval.typed_val.val = (LONGEST) result;
374 processReal (const char *num0)
376 sscanf (num0, "%" DOUBLEST_SCAN_FORMAT, &yylval.typed_val_float.dval);
378 yylval.typed_val_float.type = type_float ();
379 if (sizeof(DOUBLEST) >= gdbarch_double_bit (current_gdbarch)
381 yylval.typed_val_float.type = type_double ();
382 if (sizeof(DOUBLEST) >= gdbarch_long_double_bit (current_gdbarch)
384 yylval.typed_val_float.type = type_long_double ();
390 /* Store a canonicalized version of NAME0[0..LEN-1] in yylval.ssym. The
391 resulting string is valid until the next call to ada_parse. It differs
393 + Characters between '...' or <...> are transfered verbatim to
395 + <, >, and trailing "'" characters in quoted sequences are removed
396 (a leading quote is preserved to indicate that the name is not to be
398 + Unquoted whitespace is removed.
399 + Unquoted alphabetic characters are mapped to lower case.
400 Result is returned as a struct stoken, but for convenience, the string
401 is also null-terminated. Result string valid until the next call of
405 processId (const char *name0, int len)
407 char *name = obstack_alloc (&temp_parse_space, len + 11);
409 struct stoken result;
411 while (len > 0 && isspace (name0[len-1]))
416 if (isalnum (name0[i0]))
418 name[i] = tolower (name0[i0]);
421 else switch (name0[i0])
436 while (i0 < len && name0[i0] != '\'');
441 while (i0 < len && name0[i0] != '>')
457 /* Return TEXT[0..LEN-1], a string literal without surrounding quotes,
458 with special hex character notations replaced with characters.
459 Result valid until the next call to ada_parse. */
462 processString (const char *text, int len)
466 const char *lim = text + len;
467 struct stoken result;
469 q = result.ptr = obstack_alloc (&temp_parse_space, len);
473 if (p[0] == '[' && p[1] == '"' && p+2 < lim)
475 if (p[2] == '"') /* "...["""]... */
483 sscanf (p+2, "%2x", &chr);
493 result.length = q - result.ptr;
497 /* Returns the position within STR of the '.' in a
498 '.{WHITE}*all' component of a dotted name, or -1 if there is none.
499 Note: we actually don't need this routine, since 'all' can never be an
500 Ada identifier. Thus, looking up foo.all or foo.all.x as a name
501 must fail, and will eventually be interpreted as (foo).all or
502 (foo).all.x. However, this does avoid an extraneous lookup. */
505 find_dot_all (const char *str)
508 for (i = 0; str[i] != '\000'; i += 1)
515 while (isspace (str[i]));
516 if (strncmp (str+i, "all", 3) == 0
517 && ! isalnum (str[i+3]) && str[i+3] != '_')
524 /* Returns non-zero iff string SUBSEQ matches a subsequence of STR, ignoring
528 subseqMatch (const char *subseq, const char *str)
530 if (subseq[0] == '\0')
532 else if (str[0] == '\0')
534 else if (tolower (subseq[0]) == tolower (str[0]))
535 return subseqMatch (subseq+1, str+1) || subseqMatch (subseq, str+1);
537 return subseqMatch (subseq, str+1);
541 static struct { const char *name; int code; }
543 { "address", TICK_ADDRESS },
544 { "unchecked_access", TICK_ACCESS },
545 { "unrestricted_access", TICK_ACCESS },
546 { "access", TICK_ACCESS },
547 { "first", TICK_FIRST },
548 { "last", TICK_LAST },
549 { "length", TICK_LENGTH },
552 { "modulus", TICK_MODULUS },
554 { "range", TICK_RANGE },
555 { "size", TICK_SIZE },
561 /* Return the syntactic code corresponding to the attribute name or
565 processAttribute (const char *str)
569 for (i = 0; attributes[i].code != -1; i += 1)
570 if (strcasecmp (str, attributes[i].name) == 0)
571 return attributes[i].code;
573 for (i = 0, k = -1; attributes[i].code != -1; i += 1)
574 if (subseqMatch (str, attributes[i].name))
579 error (_("ambiguous attribute name: `%s'"), str);
582 error (_("unrecognized attribute: `%s'"), str);
584 return attributes[k].code;
593 /* Dummy definition to suppress warnings about unused static definitions. */
594 typedef void (*dummy_function) ();
595 dummy_function ada_flex_use[] =
597 (dummy_function) yyunput