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a0d0e21 perl 5.000
Larry Wall authored
1 /* regcomp.h
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TimToady authored
2 */
3
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4 typedef OP OP_4tree; /* Will be redefined later. */
5
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6 /*
7 * The "internal use only" fields in regexp.h are present to pass info from
8 * compile to execute that permits the execute phase to run lots faster on
9 * simple cases. They are:
10 *
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11 * regstart sv that must begin a match; Nullch if none obvious
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12 * reganch is the match anchored (at beginning-of-line only)?
13 * regmust string (pointer into program) that match must include, or NULL
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14 * [regmust changed to SV* for bminstr()--law]
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15 * regmlen length of regmust string
16 * [regmlen not used currently]
17 *
18 * Regstart and reganch permit very fast decisions on suitable starting points
19 * for a match, cutting down the work a lot. Regmust permits fast rejection
20 * of lines that cannot possibly match. The regmust tests are costly enough
e50aee7 This is my patch patch.1m for perl5.001.
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21 * that pregcomp() supplies a regmust only if the r.e. contains something
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22 * potentially expensive (at present, the only such thing detected is * or +
23 * at the start of the r.e., which can involve a lot of backup). Regmlen is
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24 * supplied because the test in pregexec() needs it and pregcomp() is computing
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25 * it anyway.
26 * [regmust is now supplied always. The tests that use regmust have a
27 * heuristic that disables the test if it usually matches.]
28 *
29 * [In fact, we now use regmust in many cases to locate where the search
30 * starts in the string, so if regback is >= 0, the regmust search is never
31 * wasted effort. The regback variable says how many characters back from
32 * where regmust matched is the earliest possible start of the match.
33 * For instance, /[a-z].foo/ has a regmust of 'foo' and a regback of 2.]
34 */
35
36 /*
37 * Structure for regexp "program". This is essentially a linear encoding
38 * of a nondeterministic finite-state machine (aka syntax charts or
39 * "railroad normal form" in parsing technology). Each node is an opcode
40 * plus a "next" pointer, possibly plus an operand. "Next" pointers of
41 * all nodes except BRANCH implement concatenation; a "next" pointer with
42 * a BRANCH on both ends of it is connecting two alternatives. (Here we
43 * have one of the subtle syntax dependencies: an individual BRANCH (as
44 * opposed to a collection of them) is never concatenated with anything
45 * because of operator precedence.) The operand of some types of node is
46 * a literal string; for others, it is a node leading into a sub-FSM. In
47 * particular, the operand of a BRANCH node is the first node of the branch.
48 * (NB this is *not* a tree structure: the tail of the branch connects
49 * to the thing following the set of BRANCHes.) The opcodes are:
50 */
51
52 /*
53 * A node is one char of opcode followed by two chars of "next" pointer.
54 * "Next" pointers are stored as two 8-bit pieces, high order first. The
55 * value is a positive offset from the opcode of the node containing it.
56 * An operand, if any, simply follows the node. (Note that much of the
57 * code generation knows about this implicit relationship.)
58 *
59 * Using two bytes for the "next" pointer is vast overkill for most things,
60 * but allows patterns to get big without disasters.
61 *
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62 * [The "next" pointer is always aligned on an even
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63 * boundary, and reads the offset directly as a short. Also, there is no
64 * special test to reverse the sign of BACK pointers since the offset is
65 * stored negative.]
66 */
67
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68 struct regnode_string {
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69 U8 str_len;
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70 U8 type;
71 U16 next_off;
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72 char string[1];
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73 };
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74
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75 struct regnode_1 {
76 U8 flags;
77 U8 type;
78 U16 next_off;
79 U32 arg1;
80 };
81
82 struct regnode_2 {
83 U8 flags;
84 U8 type;
85 U16 next_off;
86 U16 arg1;
87 U16 arg2;
88 };
89
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90 #define ANYOF_BITMAP_SIZE 32 /* 256 b/(8 b/B) */
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91 #define ANYOF_CLASSBITMAP_SIZE 4 /* up to 32 (8*4) named classes */
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92
93 struct regnode_charclass {
94 U8 flags;
95 U8 type;
96 U16 next_off;
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97 U32 arg1;
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98 char bitmap[ANYOF_BITMAP_SIZE]; /* only compile-time */
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99 };
100
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101 struct regnode_charclass_class { /* has [[:blah:]] classes */
102 U8 flags; /* should have ANYOF_CLASS here */
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103 U8 type;
104 U16 next_off;
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105 U32 arg1;
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106 char bitmap[ANYOF_BITMAP_SIZE]; /* both compile-time */
107 char classflags[ANYOF_CLASSBITMAP_SIZE]; /* and run-time */
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108 };
109
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110 /* XXX fix this description.
111 Impose a limit of REG_INFTY on various pattern matching operations
112 to limit stack growth and to avoid "infinite" recursions.
113 */
114 /* The default size for REG_INFTY is I16_MAX, which is the same as
115 SHORT_MAX (see perl.h). Unfortunately I16 isn't necessarily 16 bits
116 (see handy.h). On the Cray C90, sizeof(short)==4 and hence I16_MAX is
117 ((1<<31)-1), while on the Cray T90, sizeof(short)==8 and I16_MAX is
118 ((1<<63)-1). To limit stack growth to reasonable sizes, supply a
119 smaller default.
120 --Andy Dougherty 11 June 1998
121 */
122 #if SHORTSIZE > 2
123 # ifndef REG_INFTY
124 # define REG_INFTY ((1<<15)-1)
125 # endif
126 #endif
127
128 #ifndef REG_INFTY
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129 # define REG_INFTY I16_MAX
130 #endif
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131
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132 #define ARG_VALUE(arg) (arg)
133 #define ARG__SET(arg,val) ((arg) = (val))
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134
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135 #undef ARG
136 #undef ARG1
137 #undef ARG2
138
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139 #define ARG(p) ARG_VALUE(ARG_LOC(p))
140 #define ARG1(p) ARG_VALUE(ARG1_LOC(p))
141 #define ARG2(p) ARG_VALUE(ARG2_LOC(p))
142 #define ARG_SET(p, val) ARG__SET(ARG_LOC(p), (val))
143 #define ARG1_SET(p, val) ARG__SET(ARG1_LOC(p), (val))
144 #define ARG2_SET(p, val) ARG__SET(ARG2_LOC(p), (val))
145
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146 #undef NEXT_OFF
147 #undef NODE_ALIGN
148
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149 #ifndef lint
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150 # define NEXT_OFF(p) ((p)->next_off)
151 # define NODE_ALIGN(node)
152 # define NODE_ALIGN_FILL(node) ((node)->flags = 0xde) /* deadbeef */
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153 #else /* lint */
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154 # define NEXT_OFF(p) 0
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155 # define NODE_ALIGN(node)
156 # define NODE_ALIGN_FILL(node)
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157 #endif /* lint */
158
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159 #define SIZE_ALIGN NODE_ALIGN
160
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161 #undef OP
162 #undef OPERAND
163 #undef MASK
164 #undef STRING
165
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166 #define OP(p) ((p)->type)
167 #define OPERAND(p) (((struct regnode_string *)p)->string)
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168 #define MASK(p) ((char*)OPERAND(p))
169 #define STR_LEN(p) (((struct regnode_string *)p)->str_len)
170 #define STRING(p) (((struct regnode_string *)p)->string)
171 #define STR_SZ(l) ((l + sizeof(regnode) - 1) / sizeof(regnode))
172 #define NODE_SZ_STR(p) (STR_SZ(STR_LEN(p))+1)
173
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174 #undef NODE_ALIGN
175 #undef ARG_LOC
176 #undef NEXTOPER
177 #undef PREVOPER
178
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179 #define NODE_ALIGN(node)
180 #define ARG_LOC(p) (((struct regnode_1 *)p)->arg1)
181 #define ARG1_LOC(p) (((struct regnode_2 *)p)->arg1)
182 #define ARG2_LOC(p) (((struct regnode_2 *)p)->arg2)
183 #define NODE_STEP_REGNODE 1 /* sizeof(regnode)/sizeof(regnode) */
184 #define EXTRA_STEP_2ARGS EXTRA_SIZE(struct regnode_2)
185
186 #define NODE_STEP_B 4
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187
188 #define NEXTOPER(p) ((p) + NODE_STEP_REGNODE)
189 #define PREVOPER(p) ((p) - NODE_STEP_REGNODE)
190
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191 #define FILL_ADVANCE_NODE(ptr, op) STMT_START { \
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192 (ptr)->type = op; (ptr)->next_off = 0; (ptr)++; } STMT_END
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193 #define FILL_ADVANCE_NODE_ARG(ptr, op, arg) STMT_START { \
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194 ARG_SET(ptr, arg); FILL_ADVANCE_NODE(ptr, op); (ptr) += 1; } STMT_END
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195
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196 #define REG_MAGIC 0234
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197
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198 #define SIZE_ONLY (RExC_emit == &PL_regdummy)
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199
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200 /* Flags for node->flags of ANYOF */
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201
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202 #define ANYOF_CLASS 0x08 /* has [[:blah:]] classes */
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203 #define ANYOF_INVERT 0x04
204 #define ANYOF_FOLD 0x02
205 #define ANYOF_LOCALE 0x01
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206
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207 /* Used for regstclass only */
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208 #define ANYOF_EOS 0x10 /* Can match an empty string too */
209
210 /* There is a character or a range past 0xff */
211 #define ANYOF_UNICODE 0x20
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212 #define ANYOF_UNICODE_ALL 0x40 /* Can match any char past 0xff */
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213
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214 /* size of node is large (includes class pointer) */
215 #define ANYOF_LARGE 0x80
216
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217 /* Are there any runtime flags on in this node? */
218 #define ANYOF_RUNTIME(s) (ANYOF_FLAGS(s) & 0x0f)
219
220 #define ANYOF_FLAGS_ALL 0xff
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221
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222 /* Character classes for node->classflags of ANYOF */
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223 /* Should be synchronized with a table in regprop() */
224 /* 2n should pair with 2n+1 */
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225
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226 #define ANYOF_ALNUM 0 /* \w, PL_utf8_alnum, utf8::IsWord, ALNUM */
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227 #define ANYOF_NALNUM 1
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228 #define ANYOF_SPACE 2 /* \s */
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229 #define ANYOF_NSPACE 3
230 #define ANYOF_DIGIT 4
231 #define ANYOF_NDIGIT 5
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232 #define ANYOF_ALNUMC 6 /* isalnum(3), utf8::IsAlnum, ALNUMC */
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233 #define ANYOF_NALNUMC 7
234 #define ANYOF_ALPHA 8
235 #define ANYOF_NALPHA 9
236 #define ANYOF_ASCII 10
237 #define ANYOF_NASCII 11
238 #define ANYOF_CNTRL 12
239 #define ANYOF_NCNTRL 13
240 #define ANYOF_GRAPH 14
241 #define ANYOF_NGRAPH 15
242 #define ANYOF_LOWER 16
243 #define ANYOF_NLOWER 17
244 #define ANYOF_PRINT 18
245 #define ANYOF_NPRINT 19
246 #define ANYOF_PUNCT 20
247 #define ANYOF_NPUNCT 21
248 #define ANYOF_UPPER 22
249 #define ANYOF_NUPPER 23
250 #define ANYOF_XDIGIT 24
251 #define ANYOF_NXDIGIT 25
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252 #define ANYOF_PSXSPC 26 /* POSIX space: \s plus the vertical tab */
253 #define ANYOF_NPSXSPC 27
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254 #define ANYOF_BLANK 28 /* GNU extension: space and tab: non-vertical space */
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255 #define ANYOF_NBLANK 29
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256
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257 #define ANYOF_MAX 32
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258
259 /* Backward source code compatibility. */
260
261 #define ANYOF_ALNUML ANYOF_ALNUM
262 #define ANYOF_NALNUML ANYOF_NALNUM
263 #define ANYOF_SPACEL ANYOF_SPACE
264 #define ANYOF_NSPACEL ANYOF_NSPACE
265
266 /* Utility macros for the bitmap and classes of ANYOF */
267
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268 #define ANYOF_SIZE (sizeof(struct regnode_charclass))
269 #define ANYOF_CLASS_SIZE (sizeof(struct regnode_charclass_class))
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270
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271 #define ANYOF_FLAGS(p) ((p)->flags)
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272
273 #define ANYOF_BIT(c) (1 << ((c) & 7))
274
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275 #define ANYOF_CLASS_BYTE(p, c) (((struct regnode_charclass_class*)(p))->classflags[((c) >> 3) & 3])
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276 #define ANYOF_CLASS_SET(p, c) (ANYOF_CLASS_BYTE(p, c) |= ANYOF_BIT(c))
277 #define ANYOF_CLASS_CLEAR(p, c) (ANYOF_CLASS_BYTE(p, c) &= ~ANYOF_BIT(c))
278 #define ANYOF_CLASS_TEST(p, c) (ANYOF_CLASS_BYTE(p, c) & ANYOF_BIT(c))
279
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280 #define ANYOF_CLASS_ZERO(ret) Zero(((struct regnode_charclass_class*)(ret))->classflags, ANYOF_CLASSBITMAP_SIZE, char)
281 #define ANYOF_BITMAP_ZERO(ret) Zero(((struct regnode_charclass*)(ret))->bitmap, ANYOF_BITMAP_SIZE, char)
282
283 #define ANYOF_BITMAP(p) (((struct regnode_charclass*)(p))->bitmap)
284 #define ANYOF_BITMAP_BYTE(p, c) (ANYOF_BITMAP(p)[((c) >> 3) & 31])
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285 #define ANYOF_BITMAP_SET(p, c) (ANYOF_BITMAP_BYTE(p, c) |= ANYOF_BIT(c))
286 #define ANYOF_BITMAP_CLEAR(p,c) (ANYOF_BITMAP_BYTE(p, c) &= ~ANYOF_BIT(c))
287 #define ANYOF_BITMAP_TEST(p, c) (ANYOF_BITMAP_BYTE(p, c) & ANYOF_BIT(c))
288
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289 #define ANYOF_SKIP ((ANYOF_SIZE - 1)/sizeof(regnode))
290 #define ANYOF_CLASS_SKIP ((ANYOF_CLASS_SIZE - 1)/sizeof(regnode))
291 #define ANYOF_CLASS_ADD_SKIP (ANYOF_CLASS_SKIP - ANYOF_SKIP)
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292
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293 /*
294 * Utility definitions.
295 */
296 #ifndef lint
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297 #ifndef CHARMASK
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298 #define UCHARAT(p) ((int)*(U8*)(p))
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299 #else
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300 #define UCHARAT(p) ((int)*(p)&CHARMASK)
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301 #endif
302 #else /* lint */
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303 #define UCHARAT(p) PL_regdummy
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304 #endif /* lint */
305
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306 #define EXTRA_SIZE(guy) ((sizeof(guy)-1)/sizeof(struct regnode))
307
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308 #define REG_SEEN_ZERO_LEN 1
309 #define REG_SEEN_LOOKBEHIND 2
310 #define REG_SEEN_GPOS 4
311 #define REG_SEEN_EVAL 8
312 #define REG_SEEN_SANY 16
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313
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314 START_EXTERN_C
315
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316 #include "regnodes.h"
317
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318 /* The following have no fixed length. U8 so we can do strchr() on it. */
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319 #ifndef DOINIT
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320 EXTCONST U8 PL_varies[];
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321 #else
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322 EXTCONST U8 PL_varies[] = {
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323 BRANCH, BACK, STAR, PLUS, CURLY, CURLYX, REF, REFF, REFFL,
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324 WHILEM, CURLYM, CURLYN, BRANCHJ, IFTHEN, SUSPEND, CLUMP, 0
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325 };
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326 #endif
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327
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328 /* The following always have a length of 1. U8 we can do strchr() on it. */
329 /* (Note that length 1 means "one character" under UTF8, not "one octet".) */
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330 #ifndef DOINIT
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331 EXTCONST U8 PL_simple[];
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332 #else
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333 EXTCONST U8 PL_simple[] = {
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334 REG_ANY, SANY,
335 ANYOF,
336 ALNUM, ALNUML,
337 NALNUM, NALNUML,
338 SPACE, SPACEL,
339 NSPACE, NSPACEL,
340 DIGIT, NDIGIT,
341 0
c277df4 Jumbo regexp patch applied (with minor fix-up tweaks):
Ilya Zakharevich authored
342 };
343 #endif
344
73c4f7a EXTERN_C declarations for global arrays in various
Gurusamy Sarathy authored
345 END_EXTERN_C
cad2e5a @jhi Integrate with Sarathy.
jhi authored
346
347 typedef struct re_scream_pos_data_s
348 {
349 char **scream_olds; /* match pos */
350 I32 *scream_pos; /* Internal iterator of scream. */
351 } re_scream_pos_data;
352
353 struct reg_data {
354 U32 count;
355 U8 *what;
356 void* data[1];
357 };
358
359 struct reg_substr_datum {
360 I32 min_offset;
361 I32 max_offset;
362 SV *substr;
363 };
364
365 struct reg_substr_data {
366 struct reg_substr_datum data[3]; /* Actual array */
367 };
368
369 #define anchored_substr substrs->data[0].substr
370 #define anchored_offset substrs->data[0].min_offset
371 #define float_substr substrs->data[1].substr
372 #define float_min_offset substrs->data[1].min_offset
373 #define float_max_offset substrs->data[1].max_offset
374 #define check_substr substrs->data[2].substr
375 #define check_offset_min substrs->data[2].min_offset
376 #define check_offset_max substrs->data[2].max_offset
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