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annotate lib/Support/regex2.h @ 3:9ad51c7bc036

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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Wed, 15 May 2013 06:43:32 +0900
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children 54457678186b
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1 /*-
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2 * This code is derived from OpenBSD's libc/regex, original license follows:
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3 *
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4 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
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5 * Copyright (c) 1992, 1993, 1994
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6 * The Regents of the University of California. All rights reserved.
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7 *
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8 * This code is derived from software contributed to Berkeley by
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9 * Henry Spencer.
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10 *
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11 * Redistribution and use in source and binary forms, with or without
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12 * modification, are permitted provided that the following conditions
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13 * are met:
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14 * 1. Redistributions of source code must retain the above copyright
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15 * notice, this list of conditions and the following disclaimer.
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16 * 2. Redistributions in binary form must reproduce the above copyright
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17 * notice, this list of conditions and the following disclaimer in the
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18 * documentation and/or other materials provided with the distribution.
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19 * 3. Neither the name of the University nor the names of its contributors
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20 * may be used to endorse or promote products derived from this software
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21 * without specific prior written permission.
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22 *
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23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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33 * SUCH DAMAGE.
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34 *
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35 * @(#)regex2.h 8.4 (Berkeley) 3/20/94
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36 */
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37
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38 /*
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39 * internals of regex_t
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40 */
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41 #define MAGIC1 ((('r'^0200)<<8) | 'e')
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42
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43 /*
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44 * The internal representation is a *strip*, a sequence of
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45 * operators ending with an endmarker. (Some terminology etc. is a
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46 * historical relic of earlier versions which used multiple strips.)
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47 * Certain oddities in the representation are there to permit running
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48 * the machinery backwards; in particular, any deviation from sequential
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49 * flow must be marked at both its source and its destination. Some
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50 * fine points:
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51 *
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52 * - OPLUS_ and O_PLUS are *inside* the loop they create.
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53 * - OQUEST_ and O_QUEST are *outside* the bypass they create.
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54 * - OCH_ and O_CH are *outside* the multi-way branch they create, while
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55 * OOR1 and OOR2 are respectively the end and the beginning of one of
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56 * the branches. Note that there is an implicit OOR2 following OCH_
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57 * and an implicit OOR1 preceding O_CH.
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58 *
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59 * In state representations, an operator's bit is on to signify a state
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60 * immediately *preceding* "execution" of that operator.
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61 */
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62 typedef unsigned long sop; /* strip operator */
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63 typedef long sopno;
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64 #define OPRMASK 0xf8000000LU
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65 #define OPDMASK 0x07ffffffLU
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66 #define OPSHIFT ((unsigned)27)
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67 #define OP(n) ((n)&OPRMASK)
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68 #define OPND(n) ((n)&OPDMASK)
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69 #define SOP(op, opnd) ((op)|(opnd))
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70 /* operators meaning operand */
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71 /* (back, fwd are offsets) */
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72 #define OEND (1LU<<OPSHIFT) /* endmarker - */
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73 #define OCHAR (2LU<<OPSHIFT) /* character unsigned char */
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74 #define OBOL (3LU<<OPSHIFT) /* left anchor - */
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75 #define OEOL (4LU<<OPSHIFT) /* right anchor - */
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76 #define OANY (5LU<<OPSHIFT) /* . - */
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77 #define OANYOF (6LU<<OPSHIFT) /* [...] set number */
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78 #define OBACK_ (7LU<<OPSHIFT) /* begin \d paren number */
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79 #define O_BACK (8LU<<OPSHIFT) /* end \d paren number */
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80 #define OPLUS_ (9LU<<OPSHIFT) /* + prefix fwd to suffix */
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81 #define O_PLUS (10LU<<OPSHIFT) /* + suffix back to prefix */
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82 #define OQUEST_ (11LU<<OPSHIFT) /* ? prefix fwd to suffix */
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83 #define O_QUEST (12LU<<OPSHIFT) /* ? suffix back to prefix */
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84 #define OLPAREN (13LU<<OPSHIFT) /* ( fwd to ) */
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85 #define ORPAREN (14LU<<OPSHIFT) /* ) back to ( */
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86 #define OCH_ (15LU<<OPSHIFT) /* begin choice fwd to OOR2 */
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87 #define OOR1 (16LU<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */
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88 #define OOR2 (17LU<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */
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89 #define O_CH (18LU<<OPSHIFT) /* end choice back to OOR1 */
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90 #define OBOW (19LU<<OPSHIFT) /* begin word - */
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91 #define OEOW (20LU<<OPSHIFT) /* end word - */
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92
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93 /*
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94 * Structure for [] character-set representation. Character sets are
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95 * done as bit vectors, grouped 8 to a byte vector for compactness.
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96 * The individual set therefore has both a pointer to the byte vector
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97 * and a mask to pick out the relevant bit of each byte. A hash code
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98 * simplifies testing whether two sets could be identical.
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99 *
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100 * This will get trickier for multicharacter collating elements. As
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101 * preliminary hooks for dealing with such things, we also carry along
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102 * a string of multi-character elements, and decide the size of the
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103 * vectors at run time.
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104 */
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105 typedef struct {
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106 uch *ptr; /* -> uch [csetsize] */
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107 uch mask; /* bit within array */
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108 uch hash; /* hash code */
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109 size_t smultis;
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110 char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */
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111 } cset;
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112 /* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
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113 #define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
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114 #define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
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115 #define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask)
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116 #define MCadd(p, cs, cp) mcadd(p, cs, cp) /* llvm_regcomp() internal fns */
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117 #define MCsub(p, cs, cp) mcsub(p, cs, cp)
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118 #define MCin(p, cs, cp) mcin(p, cs, cp)
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119
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120 /* stuff for character categories */
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121 typedef unsigned char cat_t;
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122
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123 /*
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124 * main compiled-expression structure
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125 */
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126 struct re_guts {
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127 int magic;
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128 # define MAGIC2 ((('R'^0200)<<8)|'E')
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129 sop *strip; /* malloced area for strip */
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130 int csetsize; /* number of bits in a cset vector */
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131 int ncsets; /* number of csets in use */
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132 cset *sets; /* -> cset [ncsets] */
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133 uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */
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134 int cflags; /* copy of llvm_regcomp() cflags argument */
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135 sopno nstates; /* = number of sops */
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136 sopno firststate; /* the initial OEND (normally 0) */
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137 sopno laststate; /* the final OEND */
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138 int iflags; /* internal flags */
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139 # define USEBOL 01 /* used ^ */
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140 # define USEEOL 02 /* used $ */
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141 # define REGEX_BAD 04 /* something wrong */
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142 int nbol; /* number of ^ used */
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143 int neol; /* number of $ used */
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144 int ncategories; /* how many character categories */
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145 cat_t *categories; /* ->catspace[-CHAR_MIN] */
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146 char *must; /* match must contain this string */
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147 int mlen; /* length of must */
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148 size_t nsub; /* copy of re_nsub */
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149 int backrefs; /* does it use back references? */
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150 sopno nplus; /* how deep does it nest +s? */
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151 /* catspace must be last */
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152 cat_t catspace[1]; /* actually [NC] */
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153 };
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154
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155 /* misc utilities */
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156 #define OUT (CHAR_MAX+1) /* a non-character value */
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157 #define ISWORD(c) (isalnum(c&0xff) || (c) == '_')