LLVM 20.0.0git
regex2.h
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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
6 * The Regents of the University of California. All rights reserved.
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 * @(#)regex2.h 8.4 (Berkeley) 3/20/94
36 */
37
38#ifndef LLVM_SUPPORT_REGEX2_H
39#define LLVM_SUPPORT_REGEX2_H
40
41#include "regutils.h"
42#include <stddef.h>
43
44/*
45 * internals of regex_t
46 */
47#define MAGIC1 ((('r'^0200)<<8) | 'e')
48
49/*
50 * The internal representation is a *strip*, a sequence of
51 * operators ending with an endmarker. (Some terminology etc. is a
52 * historical relic of earlier versions which used multiple strips.)
53 * Certain oddities in the representation are there to permit running
54 * the machinery backwards; in particular, any deviation from sequential
55 * flow must be marked at both its source and its destination. Some
56 * fine points:
57 *
58 * - OPLUS_ and O_PLUS are *inside* the loop they create.
59 * - OQUEST_ and O_QUEST are *outside* the bypass they create.
60 * - OCH_ and O_CH are *outside* the multi-way branch they create, while
61 * OOR1 and OOR2 are respectively the end and the beginning of one of
62 * the branches. Note that there is an implicit OOR2 following OCH_
63 * and an implicit OOR1 preceding O_CH.
64 *
65 * In state representations, an operator's bit is on to signify a state
66 * immediately *preceding* "execution" of that operator.
67 */
68typedef unsigned long sop; /* strip operator */
69typedef long sopno;
70#define OPRMASK 0xf8000000LU
71#define OPDMASK 0x07ffffffLU
72#define OPSHIFT ((unsigned)27)
73#define OP(n) ((n)&OPRMASK)
74#define OPND(n) ((n)&OPDMASK)
75#define SOP(op, opnd) ((op)|(opnd))
76/* operators meaning operand */
77/* (back, fwd are offsets) */
78#define OEND (1LU<<OPSHIFT) /* endmarker - */
79#define OCHAR (2LU<<OPSHIFT) /* character unsigned char */
80#define OBOL (3LU<<OPSHIFT) /* left anchor - */
81#define OEOL (4LU<<OPSHIFT) /* right anchor - */
82#define OANY (5LU<<OPSHIFT) /* . - */
83#define OANYOF (6LU<<OPSHIFT) /* [...] set number */
84#define OBACK_ (7LU<<OPSHIFT) /* begin \d paren number */
85#define O_BACK (8LU<<OPSHIFT) /* end \d paren number */
86#define OPLUS_ (9LU<<OPSHIFT) /* + prefix fwd to suffix */
87#define O_PLUS (10LU<<OPSHIFT) /* + suffix back to prefix */
88#define OQUEST_ (11LU<<OPSHIFT) /* ? prefix fwd to suffix */
89#define O_QUEST (12LU<<OPSHIFT) /* ? suffix back to prefix */
90#define OLPAREN (13LU<<OPSHIFT) /* ( fwd to ) */
91#define ORPAREN (14LU<<OPSHIFT) /* ) back to ( */
92#define OCH_ (15LU<<OPSHIFT) /* begin choice fwd to OOR2 */
93#define OOR1 (16LU<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */
94#define OOR2 (17LU<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */
95#define O_CH (18LU<<OPSHIFT) /* end choice back to OOR1 */
96#define OBOW (19LU<<OPSHIFT) /* begin word - */
97#define OEOW (20LU<<OPSHIFT) /* end word - */
98
99/*
100 * Structure for [] character-set representation. Character sets are
101 * done as bit vectors, grouped 8 to a byte vector for compactness.
102 * The individual set therefore has both a pointer to the byte vector
103 * and a mask to pick out the relevant bit of each byte. A hash code
104 * simplifies testing whether two sets could be identical.
105 *
106 * This will get trickier for multicharacter collating elements. As
107 * preliminary hooks for dealing with such things, we also carry along
108 * a string of multi-character elements, and decide the size of the
109 * vectors at run time.
110 */
111typedef struct {
112 uch *ptr; /* -> uch [csetsize] */
113 uch mask; /* bit within array */
114 uch hash; /* hash code */
115 size_t smultis;
116 char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */
117} cset;
118/* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
119#define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
120#define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
121#define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask)
122#define MCadd(p, cs, cp) mcadd(p, cs, cp) /* llvm_regcomp() internal fns */
123#define MCsub(p, cs, cp) mcsub(p, cs, cp)
124#define MCin(p, cs, cp) mcin(p, cs, cp)
125
126/* stuff for character categories */
127typedef unsigned char cat_t;
128
129/*
130 * main compiled-expression structure
131 */
132struct re_guts {
133 int magic;
134# define MAGIC2 ((('R'^0200)<<8)|'E')
135 sop *strip; /* malloced area for strip */
136 int csetsize; /* number of bits in a cset vector */
137 int ncsets; /* number of csets in use */
138 cset *sets; /* -> cset [ncsets] */
139 uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */
140 int cflags; /* copy of llvm_regcomp() cflags argument */
141 sopno nstates; /* = number of sops */
142 sopno firststate; /* the initial OEND (normally 0) */
143 sopno laststate; /* the final OEND */
144 int iflags; /* internal flags */
145# define USEBOL 01 /* used ^ */
146# define USEEOL 02 /* used $ */
147# define REGEX_BAD 04 /* something wrong */
148 int nbol; /* number of ^ used */
149 int neol; /* number of $ used */
150 int ncategories; /* how many character categories */
151 cat_t *categories; /* ->catspace[-CHAR_MIN] */
152 char *must; /* match must contain this string */
153 int mlen; /* length of must */
154 size_t nsub; /* copy of re_nsub */
155 int backrefs; /* does it use back references? */
156 sopno nplus; /* how deep does it nest +s? */
157 /* catspace must be last */
158 cat_t catspace[1]; /* actually [NC] */
159};
160
161/* misc utilities */
162#define OUT (CHAR_MAX+1) /* a non-character value */
163#define ISWORD(c) (isalnum(c&0xff) || (c) == '_')
164
165#endif
unsigned long sop
Definition: regex2.h:68
long sopno
Definition: regex2.h:69
unsigned char cat_t
Definition: regex2.h:127
unsigned char uch
Definition: regutils.h:43
Definition: regex2.h:111
uch hash
Definition: regex2.h:114
char * multis
Definition: regex2.h:116
uch mask
Definition: regex2.h:113
uch * ptr
Definition: regex2.h:112
size_t smultis
Definition: regex2.h:115
int cflags
Definition: regex2.h:140
uch * setbits
Definition: regex2.h:139
int iflags
Definition: regex2.h:144
char * must
Definition: regex2.h:152
cat_t * categories
Definition: regex2.h:151
int neol
Definition: regex2.h:149
sopno firststate
Definition: regex2.h:142
int csetsize
Definition: regex2.h:136
int backrefs
Definition: regex2.h:155
int nbol
Definition: regex2.h:148
sop * strip
Definition: regex2.h:135
int ncategories
Definition: regex2.h:150
sopno nplus
Definition: regex2.h:156
sopno laststate
Definition: regex2.h:143
cset * sets
Definition: regex2.h:138
sopno nstates
Definition: regex2.h:141
int magic
Definition: regex2.h:133
size_t nsub
Definition: regex2.h:154
int ncsets
Definition: regex2.h:137
cat_t catspace[1]
Definition: regex2.h:158
int mlen
Definition: regex2.h:153