1 /* FLEX lexer for Ada expressions, for GDB.
2 Copyright (C) 1994, 1997, 1998, 2000, 2001, 2002, 2003, 2007, 2008, 2009,
3 2010 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 /*----------------------------------------------------------------------*/
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 )
62 #define YY_INPUT(BUF, RESULT, MAX_SIZE) \
63 if ( *lexptr == '\000' ) \
72 static int find_dot_all (const char *);
76 %option case-insensitive interactive nodefault
84 "--".* { yyterminate(); }
87 canonicalizeNumeral (numbuf, yytext);
88 return processInt (NULL, numbuf, strrchr(numbuf, 'e')+1);
92 canonicalizeNumeral (numbuf, yytext);
93 return processInt (NULL, numbuf, NULL);
96 {NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#"{POSEXP} {
97 canonicalizeNumeral (numbuf, yytext);
98 return processInt (numbuf,
99 strchr (numbuf, '#') + 1,
100 strrchr(numbuf, '#') + 1);
103 {NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#" {
104 canonicalizeNumeral (numbuf, yytext);
105 return processInt (numbuf, strchr (numbuf, '#') + 1, NULL);
109 canonicalizeNumeral (numbuf, yytext+2);
110 return processInt ("16#", numbuf, NULL);
114 {NUM10}"."{NUM10}{EXP} {
115 canonicalizeNumeral (numbuf, yytext);
116 return processReal (numbuf);
120 canonicalizeNumeral (numbuf, yytext);
121 return processReal (numbuf);
124 {NUM10}"#"{NUM16}"."{NUM16}"#"{EXP} {
125 error (_("Based real literals not implemented yet."));
128 {NUM10}"#"{NUM16}"."{NUM16}"#" {
129 error (_("Based real literals not implemented yet."));
132 <INITIAL>"'"({GRAPHIC}|\")"'" {
133 yylval.typed_val.type = type_char ();
134 yylval.typed_val.val = yytext[1];
138 <INITIAL>"'[\""{HEXDIG}{2}"\"]'" {
140 yylval.typed_val.type = type_char ();
141 sscanf (yytext+3, "%2x", &v);
142 yylval.typed_val.val = v;
146 \"({GRAPHIC}|"[\""({HEXDIG}{2}|\")"\"]")*\" {
147 yylval.sval = processString (yytext+1, yyleng-2);
152 error (_("ill-formed or non-terminated string literal"));
157 while (*lexptr != 'i' && *lexptr != 'I')
164 /* This keyword signals the end of the expression and
165 will be processed separately. */
166 while (*lexptr != 't' && *lexptr != 'T')
175 and { return _AND_; }
176 else { return ELSE; }
181 null { return NULL_PTR; }
183 others { return OTHERS; }
185 then { return THEN; }
188 /* BOOLEAN "KEYWORDS" */
190 /* True and False are not keywords in Ada, but rather enumeration constants.
191 However, the boolean type is no longer represented as an enum, so True
192 and False are no longer defined in symbol tables. We compromise by
193 making them keywords (when bare). */
195 true { return TRUEKEYWORD; }
196 false { return FALSEKEYWORD; }
200 {TICK}[a-zA-Z][a-zA-Z]+ { return processAttribute (yytext+1); }
204 "=>" { return ARROW; }
205 ".." { return DOTDOT; }
206 "**" { return STARSTAR; }
207 ":=" { return ASSIGN; }
208 "/=" { return NOTEQUAL; }
212 <BEFORE_QUAL_QUOTE>"'" { BEGIN INITIAL; return '\''; }
214 [-&*+./:<>=|;\[\]] { return yytext[0]; }
216 "," { if (paren_depth == 0 && comma_terminates)
226 "(" { paren_depth += 1; return '('; }
227 ")" { if (paren_depth == 0)
240 "."{WHITE}*all { return DOT_ALL; }
243 yylval.sval = processId (yytext+1, yyleng-1);
247 {ID}({WHITE}*"."{WHITE}*({ID}|\"{OPER}\"))*(" "*"'")? {
248 int all_posn = find_dot_all (yytext);
250 if (all_posn == -1 && yytext[yyleng-1] == '\'')
252 BEGIN BEFORE_QUAL_QUOTE;
255 else if (all_posn >= 0)
257 yylval.sval = processId (yytext, yyleng);
262 /* GDB EXPRESSION CONSTRUCTS */
264 "'"[^']+"'"{WHITE}*:: {
266 yylval.sval = processId (yytext, yyleng);
270 "::" { return COLONCOLON; }
272 [{}@] { return yytext[0]; }
274 /* REGISTERS AND GDB CONVENIENCE VARIABLES */
276 "$"({LETTER}|{DIG}|"$")* {
277 yylval.sval.ptr = yytext;
278 yylval.sval.length = yyleng;
279 return SPECIAL_VARIABLE;
282 /* CATCH-ALL ERROR CASE */
284 . { error (_("Invalid character '%s' in expression."), yytext); }
288 #include "gdb_string.h"
290 /* Initialize the lexer for processing new expression. */
293 lexer_init (FILE *inp)
300 /* Copy S2 to S1, removing all underscores, and downcasing all letters. */
303 canonicalizeNumeral (char *s1, const char *s2)
305 for (; *s2 != '\000'; s2 += 1)
316 /* Interprets the prefix of NUM that consists of digits of the given BASE
317 as an integer of that BASE, with the string EXP as an exponent.
318 Puts value in yylval, and returns INT, if the string is valid. Causes
319 an error if the number is improperly formated. BASE, if NULL, defaults
320 to "10", and EXP to "1". The EXP does not contain a leading 'e' or 'E'.
324 processInt (const char *base0, const char *num0, const char *exp0)
336 base = strtol (base0, (char **) NULL, 10);
337 if (base < 2 || base > 16)
338 error (_("Invalid base: %d."), base);
344 exp = strtol(exp0, (char **) NULL, 10);
347 result = strtoulst (num0, (const char **) &trailer, base);
349 error (_("Integer literal out of range"));
350 if (isxdigit(*trailer))
351 error (_("Invalid digit `%c' in based literal"), *trailer);
355 if (result > (ULONG_MAX / base))
356 error (_("Integer literal out of range"));
361 if ((result >> (gdbarch_int_bit (parse_gdbarch)-1)) == 0)
362 yylval.typed_val.type = type_int ();
363 else if ((result >> (gdbarch_long_bit (parse_gdbarch)-1)) == 0)
364 yylval.typed_val.type = type_long ();
365 else if (((result >> (gdbarch_long_bit (parse_gdbarch)-1)) >> 1) == 0)
367 /* We have a number representable as an unsigned integer quantity.
368 For consistency with the C treatment, we will treat it as an
369 anonymous modular (unsigned) quantity. Alas, the types are such
370 that we need to store .val as a signed quantity. Sorry
371 for the mess, but C doesn't officially guarantee that a simple
372 assignment does the trick (no, it doesn't; read the reference manual).
374 yylval.typed_val.type
375 = builtin_type (parse_gdbarch)->builtin_unsigned_long;
376 if (result & LONGEST_SIGN)
377 yylval.typed_val.val =
378 (LONGEST) (result & ~LONGEST_SIGN)
379 - (LONGEST_SIGN>>1) - (LONGEST_SIGN>>1);
381 yylval.typed_val.val = (LONGEST) result;
385 yylval.typed_val.type = type_long_long ();
387 yylval.typed_val.val = (LONGEST) result;
392 processReal (const char *num0)
394 sscanf (num0, "%" DOUBLEST_SCAN_FORMAT, &yylval.typed_val_float.dval);
396 yylval.typed_val_float.type = type_float ();
397 if (sizeof(DOUBLEST) >= gdbarch_double_bit (parse_gdbarch)
399 yylval.typed_val_float.type = type_double ();
400 if (sizeof(DOUBLEST) >= gdbarch_long_double_bit (parse_gdbarch)
402 yylval.typed_val_float.type = type_long_double ();
408 /* Store a canonicalized version of NAME0[0..LEN-1] in yylval.ssym. The
409 resulting string is valid until the next call to ada_parse. It differs
411 + Characters between '...' or <...> are transfered verbatim to
413 + <, >, and trailing "'" characters in quoted sequences are removed
414 (a leading quote is preserved to indicate that the name is not to be
416 + Unquoted whitespace is removed.
417 + Unquoted alphabetic characters are mapped to lower case.
418 Result is returned as a struct stoken, but for convenience, the string
419 is also null-terminated. Result string valid until the next call of
423 processId (const char *name0, int len)
425 char *name = obstack_alloc (&temp_parse_space, len + 11);
427 struct stoken result;
429 while (len > 0 && isspace (name0[len-1]))
434 if (isalnum (name0[i0]))
436 name[i] = tolower (name0[i0]);
439 else switch (name0[i0])
454 while (i0 < len && name0[i0] != '\'');
459 while (i0 < len && name0[i0] != '>')
475 /* Return TEXT[0..LEN-1], a string literal without surrounding quotes,
476 with special hex character notations replaced with characters.
477 Result valid until the next call to ada_parse. */
480 processString (const char *text, int len)
484 const char *lim = text + len;
485 struct stoken result;
487 q = result.ptr = obstack_alloc (&temp_parse_space, len);
491 if (p[0] == '[' && p[1] == '"' && p+2 < lim)
493 if (p[2] == '"') /* "...["""]... */
501 sscanf (p+2, "%2x", &chr);
511 result.length = q - result.ptr;
515 /* Returns the position within STR of the '.' in a
516 '.{WHITE}*all' component of a dotted name, or -1 if there is none.
517 Note: we actually don't need this routine, since 'all' can never be an
518 Ada identifier. Thus, looking up foo.all or foo.all.x as a name
519 must fail, and will eventually be interpreted as (foo).all or
520 (foo).all.x. However, this does avoid an extraneous lookup. */
523 find_dot_all (const char *str)
526 for (i = 0; str[i] != '\000'; i += 1)
533 while (isspace (str[i]));
534 if (strncmp (str+i, "all", 3) == 0
535 && ! isalnum (str[i+3]) && str[i+3] != '_')
542 /* Returns non-zero iff string SUBSEQ matches a subsequence of STR, ignoring
546 subseqMatch (const char *subseq, const char *str)
548 if (subseq[0] == '\0')
550 else if (str[0] == '\0')
552 else if (tolower (subseq[0]) == tolower (str[0]))
553 return subseqMatch (subseq+1, str+1) || subseqMatch (subseq, str+1);
555 return subseqMatch (subseq, str+1);
559 static struct { const char *name; int code; }
561 { "address", TICK_ADDRESS },
562 { "unchecked_access", TICK_ACCESS },
563 { "unrestricted_access", TICK_ACCESS },
564 { "access", TICK_ACCESS },
565 { "first", TICK_FIRST },
566 { "last", TICK_LAST },
567 { "length", TICK_LENGTH },
570 { "modulus", TICK_MODULUS },
572 { "range", TICK_RANGE },
573 { "size", TICK_SIZE },
579 /* Return the syntactic code corresponding to the attribute name or
583 processAttribute (const char *str)
587 for (i = 0; attributes[i].code != -1; i += 1)
588 if (strcasecmp (str, attributes[i].name) == 0)
589 return attributes[i].code;
591 for (i = 0, k = -1; attributes[i].code != -1; i += 1)
592 if (subseqMatch (str, attributes[i].name))
597 error (_("ambiguous attribute name: `%s'"), str);
600 error (_("unrecognized attribute: `%s'"), str);
602 return attributes[k].code;
611 /* Dummy definition to suppress warnings about unused static definitions. */
612 typedef void (*dummy_function) ();
613 dummy_function ada_flex_use[] =
615 (dummy_function) yyunput