LLVM  10.0.0svn
regexec.c
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1 /*-
2  * This code is derived from OpenBSD's libc/regex, original license follows:
3  *
4  * Copyright (c) 1992, 1993, 1994 Henry Spencer.
5  * Copyright (c) 1992, 1993, 1994
7  *
8  * This code is derived from software contributed to Berkeley by
9  * Henry Spencer.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  * notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in the
18  * documentation and/or other materials provided with the distribution.
19  * 3. Neither the name of the University nor the names of its contributors
20  * may be used to endorse or promote products derived from this software
21  * without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  *
35  * @(#)regexec.c 8.3 (Berkeley) 3/20/94
36  */
37
38 /*
39  * the outer shell of llvm_regexec()
40  *
41  * This file includes engine.inc *twice*, after muchos fiddling with the
42  * macros that code uses. This lets the same code operate on two different
43  * representations for state sets.
44  */
45 #include <sys/types.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <limits.h>
50 #include <ctype.h>
51 #include "regex_impl.h"
52
53 #include "regutils.h"
54 #include "regex2.h"
55
56 /* macros for manipulating states, small version */
57 /* FIXME: 'states' is assumed as 'long' on small version. */
58 #define states1 long /* for later use in llvm_regexec() decision */
59 #define states states1
60 #define CLEAR(v) ((v) = 0)
61 #define SET0(v, n) ((v) &= ~((unsigned long)1 << (n)))
62 #define SET1(v, n) ((v) |= (unsigned long)1 << (n))
63 #define ISSET(v, n) (((v) & ((unsigned long)1 << (n))) != 0)
64 #define ASSIGN(d, s) ((d) = (s))
65 #define EQ(a, b) ((a) == (b))
66 #define STATEVARS long dummy /* dummy version */
67 #define STATESETUP(m, n) /* nothing */
68 #define STATETEARDOWN(m) /* nothing */
69 #define SETUP(v) ((v) = 0)
70 #define onestate long
71 #define INIT(o, n) ((o) = (unsigned long)1 << (n))
72 #define INC(o) ((o) = (unsigned long)(o) << 1)
73 #define ISSTATEIN(v, o) (((v) & (o)) != 0)
74 /* some abbreviations; note that some of these know variable names! */
75 /* do "if I'm here, I can also be there" etc without branches */
76 #define FWD(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) << (n))
77 #define BACK(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) >> (n))
78 #define ISSETBACK(v, n) (((v) & ((unsigned long)here >> (n))) != 0)
79 /* function names */
80 #define SNAMES /* engine.inc looks after details */
81
82 #include "regengine.inc"
83
84 /* now undo things */
85 #undef states
86 #undef CLEAR
87 #undef SET0
88 #undef SET1
89 #undef ISSET
90 #undef ASSIGN
91 #undef EQ
92 #undef STATEVARS
93 #undef STATESETUP
94 #undef STATETEARDOWN
95 #undef SETUP
96 #undef onestate
97 #undef INIT
98 #undef INC
99 #undef ISSTATEIN
100 #undef FWD
101 #undef BACK
102 #undef ISSETBACK
103 #undef SNAMES
104
105 /* macros for manipulating states, large version */
106 #define states char *
107 #define CLEAR(v) memset(v, 0, m->g->nstates)
108 #define SET0(v, n) ((v)[n] = 0)
109 #define SET1(v, n) ((v)[n] = 1)
110 #define ISSET(v, n) ((v)[n])
111 #define ASSIGN(d, s) memmove(d, s, m->g->nstates)
112 #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0)
113 #define STATEVARS long vn; char *space
114 #define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \
115  if ((m)->space == NULL) return(REG_ESPACE); \
116  (m)->vn = 0; }
117 #define STATETEARDOWN(m) { free((m)->space); }
118 #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates])
119 #define onestate long
120 #define INIT(o, n) ((o) = (n))
121 #define INC(o) ((o)++)
122 #define ISSTATEIN(v, o) ((v)[o])
123 /* some abbreviations; note that some of these know variable names! */
124 /* do "if I'm here, I can also be there" etc without branches */
125 #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here])
126 #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here])
127 #define ISSETBACK(v, n) ((v)[here - (n)])
128 /* function names */
129 #define LNAMES /* flag */
130
131 #include "regengine.inc"
132
133 /*
134  - llvm_regexec - interface for matching
135  *
136  * We put this here so we can exploit knowledge of the state representation
137  * when choosing which matcher to call. Also, by this point the matchers
138  * have been prototyped.
139  */
140 int /* 0 success, REG_NOMATCH failure */
141 llvm_regexec(const llvm_regex_t *preg, const char *string, size_t nmatch,
142  llvm_regmatch_t pmatch[], int eflags)
143 {
144  struct re_guts *g = preg->re_g;
145 #ifdef REDEBUG
146 # define GOODFLAGS(f) (f)
147 #else
148 # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
149 #endif
150
151  if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
154  if (g->iflags&REGEX_BAD) /* backstop for no-debug case */
156  eflags = GOODFLAGS(eflags);
157
158  if (g->nstates <= (long)(CHAR_BIT*sizeof(states1)) && !(eflags&REG_LARGE))
159  return(smatcher(g, string, nmatch, pmatch, eflags));
160  else
161  return(lmatcher(g, string, nmatch, pmatch, eflags));
162 }
#define MAGIC2
Definition: regex2.h:134
int llvm_regexec(const llvm_regex_t *preg, const char *string, size_t nmatch, llvm_regmatch_t pmatch[], int eflags)
Definition: regexec.c:141
int re_magic
Definition: regex_impl.h:49
Definition: regex_impl.h:67
sopno nstates
Definition: regex2.h:141
#define MAGIC1
Definition: regex2.h:47
int iflags
Definition: regex2.h:144
struct re_guts * re_g
Definition: regex_impl.h:52