| 1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 | * vim: set sw=4 ts=8 et tw=80: | |
| 3 | * | |
| 4 | * ***** BEGIN LICENSE BLOCK ***** | |
| 5 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1 | |
| 6 | * | |
| 7 | * The contents of this file are subject to the Mozilla Public License Version | |
| 8 | * 1.1 (the "License"); you may not use this file except in compliance with | |
| 9 | * the License. You may obtain a copy of the License at | |
| 10 | * http://www.mozilla.org/MPL/ | |
| 11 | * | |
| 12 | * Software distributed under the License is distributed on an "AS IS" basis, | |
| 13 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License | |
| 14 | * for the specific language governing rights and limitations under the | |
| 15 | * License. | |
| 16 | * | |
| 17 | * The Original Code is Mozilla Communicator client code, released | |
| 18 | * March 31, 1998. | |
| 19 | * | |
| 20 | * The Initial Developer of the Original Code is | |
| 21 | * Netscape Communications Corporation. | |
| 22 | * Portions created by the Initial Developer are Copyright (C) 1998 | |
| 23 | * the Initial Developer. All Rights Reserved. | |
| 24 | * | |
| 25 | * Contributor(s): | |
| 26 | * | |
| 27 | * Alternatively, the contents of this file may be used under the terms of | |
| 28 | * either of the GNU General Public License Version 2 or later (the "GPL"), | |
| 29 | * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), | |
| 30 | * in which case the provisions of the GPL or the LGPL are applicable instead | |
| 31 | * of those above. If you wish to allow use of your version of this file only | |
| 32 | * under the terms of either the GPL or the LGPL, and not to allow others to | |
| 33 | * use your version of this file under the terms of the MPL, indicate your | |
| 34 | * decision by deleting the provisions above and replace them with the notice | |
| 35 | * and other provisions required by the GPL or the LGPL. If you do not delete | |
| 36 | * the provisions above, a recipient may use your version of this file under | |
| 37 | * the terms of any one of the MPL, the GPL or the LGPL. | |
| 38 | * | |
| 39 | * ***** END LICENSE BLOCK ***** */ | |
| 40 | ||
| 41 | /* | |
| 42 | * JS regular expressions, after Perl. | |
| 43 | */ | |
| 44 | #include "jsstddef.h" | |
| 45 | #include <stdlib.h> | |
| 46 | #include <string.h> | |
| 47 | #include "jstypes.h" | |
| 48 | #include "jsarena.h" /* Added by JSIFY */ | |
| 49 | #include "jsutil.h" /* Added by JSIFY */ | |
| 50 | #include "jsapi.h" | |
| 51 | #include "jsarray.h" | |
| 52 | #include "jsatom.h" | |
| 53 | #include "jscntxt.h" | |
| 54 | #include "jsconfig.h" | |
| 55 | #include "jsfun.h" | |
| 56 | #include "jsgc.h" | |
| 57 | #include "jsinterp.h" | |
| 58 | #include "jslock.h" | |
| 59 | #include "jsnum.h" | |
| 60 | #include "jsobj.h" | |
| 61 | #include "jsopcode.h" | |
| 62 | #include "jsregexp.h" | |
| 63 | #include "jsscan.h" | |
| 64 | #include "jsstr.h" | |
| 65 | ||
| 66 | #if JS_HAS_REGEXPS | |
| 67 | ||
| 68 | /* Note : contiguity of 'simple opcodes' is important for SimpleMatch() */ | |
| 69 | typedef enum REOp { | |
| 70 | REOP_EMPTY = 0, /* match rest of input against rest of r.e. */ | |
| 71 | REOP_ALT = 1, /* alternative subexpressions in kid and next */ | |
| 72 | REOP_SIMPLE_START = 2, /* start of 'simple opcodes' */ | |
| 73 | REOP_BOL = 2, /* beginning of input (or line if multiline) */ | |
| 74 | REOP_EOL = 3, /* end of input (or line if multiline) */ | |
| 75 | REOP_WBDRY = 4, /* match "" at word boundary */ | |
| 76 | REOP_WNONBDRY = 5, /* match "" at word non-boundary */ | |
| 77 | REOP_DOT = 6, /* stands for any character */ | |
| 78 | REOP_DIGIT = 7, /* match a digit char: [0-9] */ | |
| 79 | REOP_NONDIGIT = 8, /* match a non-digit char: [^0-9] */ | |
| 80 | REOP_ALNUM = 9, /* match an alphanumeric char: [0-9a-z_A-Z] */ | |
| 81 | REOP_NONALNUM = 10, /* match a non-alphanumeric char: [^0-9a-z_A-Z] */ | |
| 82 | REOP_SPACE = 11, /* match a whitespace char */ | |
| 83 | REOP_NONSPACE = 12, /* match a non-whitespace char */ | |
| 84 | REOP_BACKREF = 13, /* back-reference (e.g., \1) to a parenthetical */ | |
| 85 | REOP_FLAT = 14, /* match a flat string */ | |
| 86 | REOP_FLAT1 = 15, /* match a single char */ | |
| 87 | REOP_FLATi = 16, /* case-independent REOP_FLAT */ | |
| 88 | REOP_FLAT1i = 17, /* case-independent REOP_FLAT1 */ | |
| 89 | REOP_UCFLAT1 = 18, /* single Unicode char */ | |
| 90 | REOP_UCFLAT1i = 19, /* case-independent REOP_UCFLAT1 */ | |
| 91 | REOP_UCFLAT = 20, /* flat Unicode string; len immediate counts chars */ | |
| 92 | REOP_UCFLATi = 21, /* case-independent REOP_UCFLAT */ | |
| 93 | REOP_CLASS = 22, /* character class with index */ | |
| 94 | REOP_NCLASS = 23, /* negated character class with index */ | |
| 95 | REOP_SIMPLE_END = 23, /* end of 'simple opcodes' */ | |
| 96 | REOP_QUANT = 25, /* quantified atom: atom{1,2} */ | |
| 97 | REOP_STAR = 26, /* zero or more occurrences of kid */ | |
| 98 | REOP_PLUS = 27, /* one or more occurrences of kid */ | |
| 99 | REOP_OPT = 28, /* optional subexpression in kid */ | |
| 100 | REOP_LPAREN = 29, /* left paren bytecode: kid is u.num'th sub-regexp */ | |
| 101 | REOP_RPAREN = 30, /* right paren bytecode */ | |
| 102 | REOP_JUMP = 31, /* for deoptimized closure loops */ | |
| 103 | REOP_DOTSTAR = 32, /* optimize .* to use a single opcode */ | |
| 104 | REOP_ANCHOR = 33, /* like .* but skips left context to unanchored r.e. */ | |
| 105 | REOP_EOLONLY = 34, /* $ not preceded by any pattern */ | |
| 106 | REOP_BACKREFi = 37, /* case-independent REOP_BACKREF */ | |
| 107 | REOP_LPARENNON = 41, /* non-capturing version of REOP_LPAREN */ | |
| 108 | REOP_ASSERT = 43, /* zero width positive lookahead assertion */ | |
| 109 | REOP_ASSERT_NOT = 44, /* zero width negative lookahead assertion */ | |
| 110 | REOP_ASSERTTEST = 45, /* sentinel at end of assertion child */ | |
| 111 | REOP_ASSERTNOTTEST = 46, /* sentinel at end of !assertion child */ | |
| 112 | REOP_MINIMALSTAR = 47, /* non-greedy version of * */ | |
| 113 | REOP_MINIMALPLUS = 48, /* non-greedy version of + */ | |
| 114 | REOP_MINIMALOPT = 49, /* non-greedy version of ? */ | |
| 115 | REOP_MINIMALQUANT = 50, /* non-greedy version of {} */ | |
| 116 | REOP_ENDCHILD = 51, /* sentinel at end of quantifier child */ | |
| 117 | REOP_REPEAT = 52, /* directs execution of greedy quantifier */ | |
| 118 | REOP_MINIMALREPEAT = 53, /* directs execution of non-greedy quantifier */ | |
| 119 | REOP_ALTPREREQ = 54, /* prerequisite for ALT, either of two chars */ | |
| 120 | REOP_ALTPREREQ2 = 55, /* prerequisite for ALT, a char or a class */ | |
| 121 | REOP_ENDALT = 56, /* end of final alternate */ | |
| 122 | REOP_CONCAT = 57, /* concatenation of terms (parse time only) */ | |
| 123 | ||
| 124 | REOP_END | |
| 125 | } REOp; | |
| 126 | ||
| 127 | #define REOP_IS_SIMPLE(op) ((unsigned)((op) - REOP_SIMPLE_START) < \ | |
| 128 | (unsigned)REOP_SIMPLE_END) | |
| 129 | ||
| 130 | struct RENode { | |
| 131 | REOp op; /* r.e. op bytecode */ | |
| 132 | RENode *next; /* next in concatenation order */ | |
| 133 | void *kid; /* first operand */ | |
| 134 | union { | |
| 135 | void *kid2; /* second operand */ | |
| 136 | jsint num; /* could be a number */ | |
| 137 | size_t parenIndex; /* or a parenthesis index */ | |
| 138 | struct { /* or a quantifier range */ | |
| 139 | uintN min; | |
| 140 | uintN max; | |
| 141 | JSPackedBool greedy; | |
| 142 | } range; | |
| 143 | struct { /* or a character class */ | |
| 144 | size_t startIndex; | |
| 145 | size_t kidlen; /* length of string at kid, in jschars */ | |
| 146 | size_t index; /* index into class list */ | |
| 147 | uint16 bmsize; /* bitmap size, based on max char code */ | |
| 148 | JSPackedBool sense; | |
| 149 | } ucclass; | |
| 150 | struct { /* or a literal sequence */ | |
| 151 | jschar chr; /* of one character */ | |
| 152 | size_t length; /* or many (via the kid) */ | |
| 153 | } flat; | |
| 154 | struct { | |
| 155 | RENode *kid2; /* second operand from ALT */ | |
| 156 | jschar ch1; /* match char for ALTPREREQ */ | |
| 157 | jschar ch2; /* ditto, or class index for ALTPREREQ2 */ | |
| 158 | } altprereq; | |
| 159 | } u; | |
| 160 | }; | |
| 161 | ||
| 162 | #define RE_IS_LETTER(c) (((c >= 'A') && (c <= 'Z')) || \ | |
| 163 | ((c >= 'a') && (c <= 'z')) ) | |
| 164 | #define RE_IS_LINE_TERM(c) ((c == '\n') || (c == '\r') || \ | |
| 165 | (c == LINE_SEPARATOR) || (c == PARA_SEPARATOR)) | |
| 166 | ||
| 167 | #define CLASS_CACHE_SIZE 4 | |
| 168 | ||
| 169 | typedef struct CompilerState { | |
| 170 | JSContext *context; | |
| 171 | JSTokenStream *tokenStream; /* For reporting errors */ | |
| 172 | const jschar *cpbegin; | |
| 173 | const jschar *cpend; | |
| 174 | const jschar *cp; | |
| 175 | size_t parenCount; | |
| 176 | size_t classCount; /* number of [] encountered */ | |
| 177 | size_t treeDepth; /* maximum depth of parse tree */ | |
| 178 | size_t progLength; /* estimated bytecode length */ | |
| 179 | RENode *result; | |
| 180 | size_t classBitmapsMem; /* memory to hold all class bitmaps */ | |
| 181 | struct { | |
| 182 | const jschar *start; /* small cache of class strings */ | |
| 183 | size_t length; /* since they're often the same */ | |
| 184 | size_t index; | |
| 185 | } classCache[CLASS_CACHE_SIZE]; | |
| 186 | uint16 flags; | |
| 187 | } CompilerState; | |
| 188 | ||
| 189 | typedef struct EmitStateStackEntry { | |
| 190 | jsbytecode *altHead; /* start of REOP_ALT* opcode */ | |
| 191 | jsbytecode *nextAltFixup; /* fixup pointer to next-alt offset */ | |
| 192 | jsbytecode *nextTermFixup; /* fixup ptr. to REOP_JUMP offset */ | |
| 193 | jsbytecode *endTermFixup; /* fixup ptr. to REOPT_ALTPREREQ* offset */ | |
| 194 | RENode *continueNode; /* original REOP_ALT* node being stacked */ | |
| 195 | jsbytecode continueOp; /* REOP_JUMP or REOP_ENDALT continuation */ | |
| 196 | JSPackedBool jumpToJumpFlag; /* true if we've patched jump-to-jump to | |
| 197 | avoid 16-bit unsigned offset overflow */ | |
| 198 | } EmitStateStackEntry; | |
| 199 | ||
| 200 | /* | |
| 201 | * Immediate operand sizes and getter/setters. Unlike the ones in jsopcode.h, | |
| 202 | * the getters and setters take the pc of the offset, not of the opcode before | |
| 203 | * the offset. | |
| 204 | */ | |
| 205 | #define ARG_LEN 2 | |
| 206 | #define GET_ARG(pc) ((uint16)(((pc)[0] << 8) | (pc)[1])) | |
| 207 | #define SET_ARG(pc, arg) ((pc)[0] = (jsbytecode) ((arg) >> 8), \ | |
| 208 | (pc)[1] = (jsbytecode) (arg)) | |
| 209 | ||
| 210 | #define OFFSET_LEN ARG_LEN | |
| 211 | #define OFFSET_MAX (JS_BIT(ARG_LEN * 8) - 1) | |
| 212 | #define GET_OFFSET(pc) GET_ARG(pc) | |
| 213 | ||
| 214 | /* | |
| 215 | * Maximum supported tree depth is maximum size of EmitStateStackEntry stack. | |
| 216 | * For sanity, we limit it to 2^24 bytes. | |
| 217 | */ | |
| 218 | #define TREE_DEPTH_MAX (JS_BIT(24) / sizeof(EmitStateStackEntry)) | |
| 219 | ||
| 220 | /* | |
| 221 | * The maximum memory that can be allocated for class bitmaps. | |
| 222 | * For sanity, we limit it to 2^24 bytes. | |
| 223 | */ | |
| 224 | #define CLASS_BITMAPS_MEM_LIMIT JS_BIT(24) | |
| 225 | ||
| 226 | /* | |
| 227 | * Functions to get size and write/read bytecode that represent small indexes | |
| 228 | * compactly. | |
| 229 | * Each byte in the code represent 7-bit chunk of the index. 8th bit when set | |
| 230 | * indicates that the following byte brings more bits to the index. Otherwise | |
| 231 | * this is the last byte in the index bytecode representing highest index bits. | |
| 232 | */ | |
| 233 | static size_t | |
| 234 | GetCompactIndexWidth(size_t index) | |
| 235 | 737920 | { |
| 236 | 737920 | size_t width; |
| 237 | ||
| 238 | 737920 | for (width = 1; (index >>= 7) != 0; ++width) { } |
| 239 | 737920 | return width; |
| 240 | } | |
| 241 | ||
| 242 | static jsbytecode * | |
| 243 | WriteCompactIndex(jsbytecode *pc, size_t index) | |
| 244 | 1475712 | { |
| 245 | 1475712 | size_t next; |
| 246 | ||
| 247 | 1874916 | while ((next = index >> 7) != 0) { |
| 248 | 399204 | *pc++ = (jsbytecode)(index | 0x80); |
| 249 | 399204 | index = next; |
| 250 | } | |
| 251 | 1475712 | *pc++ = (jsbytecode)index; |
| 252 | 1475712 | return pc; |
| 253 | } | |
| 254 | ||
| 255 | static jsbytecode * | |
| 256 | ReadCompactIndex(jsbytecode *pc, size_t *result) | |
| 257 | 2441202 | { |
| 258 | 2441202 | size_t nextByte; |
| 259 | ||
| 260 | 2441202 | nextByte = *pc++; |
| 261 | 2441202 | if ((nextByte & 0x80) == 0) { |
| 262 | /* | |
| 263 | * Short-circuit the most common case when compact index <= 127. | |
| 264 | */ | |
| 265 | 2072634 | *result = nextByte; |
| 266 | } else { | |
| 267 | 368568 | size_t shift = 7; |
| 268 | 368568 | *result = 0x7F & nextByte; |
| 269 | 368568 | do { |
| 270 | 368568 | nextByte = *pc++; |
| 271 | 368568 | *result |= (nextByte & 0x7F) << shift; |
| 272 | 368568 | shift += 7; |
| 273 | 368568 | } while ((nextByte & 0x80) != 0); |
| 274 | } | |
| 275 | 2441202 | return pc; |
| 276 | } | |
| 277 | ||
| 278 | typedef struct RECapture { | |
| 279 | ptrdiff_t index; /* start of contents, -1 for empty */ | |
| 280 | size_t length; /* length of capture */ | |
| 281 | } RECapture; | |
| 282 | ||
| 283 | typedef struct REMatchState { | |
| 284 | const jschar *cp; | |
| 285 | RECapture parens[1]; /* first of 're->parenCount' captures, | |
| 286 | allocated at end of this struct */ | |
| 287 | } REMatchState; | |
| 288 | ||
| 289 | struct REBackTrackData; | |
| 290 | ||
| 291 | typedef struct REProgState { | |
| 292 | jsbytecode *continue_pc; /* current continuation data */ | |
| 293 | jsbytecode continue_op; | |
| 294 | ptrdiff_t index; /* progress in text */ | |
| 295 | size_t parenSoFar; /* highest indexed paren started */ | |
| 296 | union { | |
| 297 | struct { | |
| 298 | uintN min; /* current quantifier limits */ | |
| 299 | uintN max; | |
| 300 | } quantifier; | |
| 301 | struct { | |
| 302 | size_t top; /* backtrack stack state */ | |
| 303 | size_t sz; | |
| 304 | } assertion; | |
| 305 | } u; | |
| 306 | } REProgState; | |
| 307 | ||
| 308 | typedef struct REBackTrackData { | |
| 309 | size_t sz; /* size of previous stack entry */ | |
| 310 | jsbytecode *backtrack_pc; /* where to backtrack to */ | |
| 311 | jsbytecode backtrack_op; | |
| 312 | const jschar *cp; /* index in text of match at backtrack */ | |
| 313 | size_t parenIndex; /* start index of saved paren contents */ | |
| 314 | size_t parenCount; /* # of saved paren contents */ | |
| 315 | size_t saveStateStackTop; /* number of parent states */ | |
| 316 | /* saved parent states follow */ | |
| 317 | /* saved paren contents follow */ | |
| 318 | } REBackTrackData; | |
| 319 | ||
| 320 | #define INITIAL_STATESTACK 100 | |
| 321 | #define INITIAL_BACKTRACK 8000 | |
| 322 | ||
| 323 | typedef struct REGlobalData { | |
| 324 | JSContext *cx; | |
| 325 | JSRegExp *regexp; /* the RE in execution */ | |
| 326 | JSBool ok; /* runtime error (out_of_memory only?) */ | |
| 327 | size_t start; /* offset to start at */ | |
| 328 | ptrdiff_t skipped; /* chars skipped anchoring this r.e. */ | |
| 329 | const jschar *cpbegin; /* text base address */ | |
| 330 | const jschar *cpend; /* text limit address */ | |
| 331 | ||
| 332 | REProgState *stateStack; /* stack of state of current parents */ | |
| 333 | size_t stateStackTop; | |
| 334 | size_t stateStackLimit; | |
| 335 | ||
| 336 | REBackTrackData *backTrackStack;/* stack of matched-so-far positions */ | |
| 337 | REBackTrackData *backTrackSP; | |
| 338 | size_t backTrackStackSize; | |
| 339 | size_t cursz; /* size of current stack entry */ | |
| 340 | ||
| 341 | JSArenaPool pool; /* It's faster to use one malloc'd pool | |
| 342 | than to malloc/free the three items | |
| 343 | that are allocated from this pool */ | |
| 344 | } REGlobalData; | |
| 345 | ||
| 346 | /* | |
| 347 | * 1. If IgnoreCase is false, return ch. | |
| 348 | * 2. Let u be ch converted to upper case as if by calling | |
| 349 | * String.prototype.toUpperCase on the one-character string ch. | |
| 350 | * 3. If u does not consist of a single character, return ch. | |
| 351 | * 4. Let cu be u's character. | |
| 352 | * 5. If ch's code point value is greater than or equal to decimal 128 and cu's | |
| 353 | * code point value is less than decimal 128, then return ch. | |
| 354 | * 6. Return cu. | |
| 355 | */ | |
| 356 | static jschar | |
| 357 | upcase(jschar ch) | |
| 358 | 0 | { |
| 359 | 0 | jschar cu = JS_TOUPPER(ch); |
| 360 | 0 | if (ch >= 128 && cu < 128) |
| 361 | 0 | return ch; |
| 362 | 0 | return cu; |
| 363 | } | |
| 364 | ||
| 365 | static jschar | |
| 366 | downcase(jschar ch) | |
| 367 | 0 | { |
| 368 | 0 | jschar cl = JS_TOLOWER(ch); |
| 369 | 0 | if (cl >= 128 && ch < 128) |
| 370 | 0 | return ch; |
| 371 | 0 | return cl; |
| 372 | } | |
| 373 | ||
| 374 | /* Construct and initialize an RENode, returning NULL for out-of-memory */ | |
| 375 | static RENode * | |
| 376 | NewRENode(CompilerState *state, REOp op) | |
| 377 | 4764620 | { |
| 378 | 4764620 | JSContext *cx; |
| 379 | 4764620 | RENode *ren; |
| 380 | ||
| 381 | 4764620 | cx = state->context; |
| 382 | 4764620 | JS_ARENA_ALLOCATE_CAST(ren, RENode *, &cx->tempPool, sizeof *ren); |
| 383 | 4764620 | if (!ren) { |
| 384 | 0 | JS_ReportOutOfMemory(cx); |
| 385 | 0 | return NULL; |
| 386 | } | |
| 387 | 4764620 | ren->op = op; |
| 388 | 4764620 | ren->next = NULL; |
| 389 | 4764620 | ren->kid = NULL; |
| 390 | 4764620 | return ren; |
| 391 | } | |
| 392 | ||
| 393 | /* | |
| 394 | * Validates and converts hex ascii value. | |
| 395 | */ | |
| 396 | static JSBool | |
| 397 | isASCIIHexDigit(jschar c, uintN *digit) | |
| 398 | 0 | { |
| 399 | 0 | uintN cv = c; |
| 400 | ||
| 401 | 0 | if (cv < '0') |
| 402 | 0 | return JS_FALSE; |
| 403 | 0 | if (cv <= '9') { |
| 404 | 0 | *digit = cv - '0'; |
| 405 | 0 | return JS_TRUE; |
| 406 | } | |
| 407 | 0 | cv |= 0x20; |
| 408 | 0 | if (cv >= 'a' && cv <= 'f') { |
| 409 | 0 | *digit = cv - 'a' + 10; |
| 410 | 0 | return JS_TRUE; |
| 411 | } | |
| 412 | 0 | return JS_FALSE; |
| 413 | } | |
| 414 | ||
| 415 | ||
| 416 | typedef struct { | |
| 417 | REOp op; | |
| 418 | const jschar *errPos; | |
| 419 | size_t parenIndex; | |
| 420 | } REOpData; | |
| 421 | ||
| 422 | ||
| 423 | /* | |
| 424 | * Process the op against the two top operands, reducing them to a single | |
| 425 | * operand in the penultimate slot. Update progLength and treeDepth. | |
| 426 | */ | |
| 427 | static JSBool | |
| 428 | ProcessOp(CompilerState *state, REOpData *opData, RENode **operandStack, | |
| 429 | intN operandSP) | |
| 430 | 4027132 | { |
| 431 | 4027132 | RENode *result; |
| 432 | ||
| 433 | 4027132 | switch (opData->op) { |
| 434 | case REOP_ALT: | |
| 435 | 706348 | result = NewRENode(state, REOP_ALT); |
| 436 | 706348 | if (!result) |
| 437 | 0 | return JS_FALSE; |
| 438 | 706348 | result->kid = operandStack[operandSP - 2]; |
| 439 | 706348 | result->u.kid2 = operandStack[operandSP - 1]; |
| 440 | 706348 | operandStack[operandSP - 2] = result; |
| 441 | ||
| 442 | 706348 | if (state->treeDepth == TREE_DEPTH_MAX) { |
| 443 | 0 | js_ReportCompileErrorNumber(state->context, state->tokenStream, |
| 444 | JSREPORT_TS | JSREPORT_ERROR, | |
| 445 | JSMSG_REGEXP_TOO_COMPLEX); | |
| 446 | 0 | return JS_FALSE; |
| 447 | } | |
| 448 | 706348 | ++state->treeDepth; |
| 449 | ||
| 450 | /* | |
| 451 | * Look at both alternates to see if there's a FLAT or a CLASS at | |
| 452 | * the start of each. If so, use a prerequisite match. | |
| 453 | */ | |
| 454 | 706348 | if (((RENode *) result->kid)->op == REOP_FLAT && |
| 455 | ((RENode *) result->u.kid2)->op == REOP_FLAT && | |
| 456 | (state->flags & JSREG_FOLD) == 0) { | |
| 457 | 15386 | result->op = REOP_ALTPREREQ; |
| 458 | 15386 | result->u.altprereq.ch1 = ((RENode *) result->kid)->u.flat.chr; |
| 459 | 15386 | result->u.altprereq.ch2 = ((RENode *) result->u.kid2)->u.flat.chr; |
| 460 | /* ALTPREREQ, <end>, uch1, uch2, <next>, ..., | |
| 461 | JUMP, <end> ... ENDALT */ | |
| 462 | 15386 | state->progLength += 13; |
| 463 | } | |
| 464 | else | |
| 465 | 690962 | if (((RENode *) result->kid)->op == REOP_CLASS && |
| 466 | ((RENode *) result->kid)->u.ucclass.index < 256 && | |
| 467 | ((RENode *) result->u.kid2)->op == REOP_FLAT && | |
| 468 | (state->flags & JSREG_FOLD) == 0) { | |
| 469 | 0 | result->op = REOP_ALTPREREQ2; |
| 470 | 0 | result->u.altprereq.ch1 = ((RENode *) result->u.kid2)->u.flat.chr; |
| 471 | 0 | result->u.altprereq.ch2 = ((RENode *) result->kid)->u.ucclass.index; |
| 472 | /* ALTPREREQ2, <end>, uch1, uch2, <next>, ..., | |
| 473 | JUMP, <end> ... ENDALT */ | |
| 474 | 0 | state->progLength += 13; |
| 475 | } | |
| 476 | else | |
| 477 | 690962 | if (((RENode *) result->kid)->op == REOP_FLAT && |
| 478 | ((RENode *) result->u.kid2)->op == REOP_CLASS && | |
| 479 | ((RENode *) result->u.kid2)->u.ucclass.index < 256 && | |
| 480 | (state->flags & JSREG_FOLD) == 0) { | |
| 481 | 0 | result->op = REOP_ALTPREREQ2; |
| 482 | 0 | result->u.altprereq.ch1 = ((RENode *) result->kid)->u.flat.chr; |
| 483 | 0 | result->u.altprereq.ch2 = |
| 484 | ((RENode *) result->u.kid2)->u.ucclass.index; | |
| 485 | /* ALTPREREQ2, <end>, uch1, uch2, <next>, ..., | |
| 486 | JUMP, <end> ... ENDALT */ | |
| 487 | 0 | state->progLength += 13; |
| 488 | } | |
| 489 | else { | |
| 490 | /* ALT, <next>, ..., JUMP, <end> ... ENDALT */ | |
| 491 | 690962 | state->progLength += 7; |
| 492 | } | |
| 493 | 690962 | break; |
| 494 | ||
| 495 | case REOP_CONCAT: | |
| 496 | 3320784 | result = operandStack[operandSP - 2]; |
| 497 | 3320784 | while (result->next) |
| 498 | 0 | result = result->next; |
| 499 | 3320784 | result->next = operandStack[operandSP - 1]; |
| 500 | 3320784 | break; |
| 501 | ||
| 502 | case REOP_ASSERT: | |
| 503 | case REOP_ASSERT_NOT: | |
| 504 | case REOP_LPARENNON: | |
| 505 | case REOP_LPAREN: | |
| 506 | /* These should have been processed by a close paren. */ | |
| 507 | 0 | js_ReportCompileErrorNumberUC(state->context, state->tokenStream, |
| 508 | JSREPORT_TS | JSREPORT_ERROR, | |
| 509 | JSMSG_MISSING_PAREN, opData->errPos); | |
| 510 | 0 | return JS_FALSE; |
| 511 | ||
| 512 | default:; | |
| 513 | } | |
| 514 | 4027132 | return JS_TRUE; |
| 515 | } | |
| 516 | ||
| 517 | /* | |
| 518 | * Parser forward declarations. | |
| 519 | */ | |
| 520 | static JSBool ParseTerm(CompilerState *state); | |
| 521 | static JSBool ParseQuantifier(CompilerState *state); | |
| 522 | static intN ParseMinMaxQuantifier(CompilerState *state, JSBool ignoreValues); | |
| 523 | ||
| 524 | /* | |
| 525 | * Top-down regular expression grammar, based closely on Perl4. | |
| 526 | * | |
| 527 | * regexp: altern A regular expression is one or more | |
| 528 | * altern '|' regexp alternatives separated by vertical bar. | |
| 529 | */ | |
| 530 | #define INITIAL_STACK_SIZE 128 | |
| 531 | ||
| 532 | static JSBool | |
| 533 | ParseRegExp(CompilerState *state) | |
| 534 | 15754 | { |
| 535 | 15754 | size_t parenIndex; |
| 536 | 15754 | RENode *operand; |
| 537 | 15754 | REOpData *operatorStack; |
| 538 | 15754 | RENode **operandStack; |
| 539 | 15754 | REOp op; |
| 540 | 15754 | intN i; |
| 541 | 15754 | JSBool result = JS_FALSE; |
| 542 | ||
| 543 | 15754 | intN operatorSP = 0, operatorStackSize = INITIAL_STACK_SIZE; |
| 544 | 15754 | intN operandSP = 0, operandStackSize = INITIAL_STACK_SIZE; |
| 545 | ||
| 546 | /* Watch out for empty regexp */ | |
| 547 | 15754 | if (state->cp == state->cpend) { |
| 548 | 16 | state->result = NewRENode(state, REOP_EMPTY); |
| 549 | 16 | return (state->result != NULL); |
| 550 | } | |
| 551 | ||
| 552 | 15738 | operatorStack = (REOpData *) |
| 553 | JS_malloc(state->context, sizeof(REOpData) * operatorStackSize); | |
| 554 | 15738 | if (!operatorStack) |
| 555 | 0 | return JS_FALSE; |
| 556 | ||
| 557 | 15738 | operandStack = (RENode **) |
| 558 | JS_malloc(state->context, sizeof(RENode *) * operandStackSize); | |
| 559 | 15738 | if (!operandStack) |
| 560 | 0 | goto out; |
| 561 | ||
| 562 | 8100774 | for (;;) { |
| 563 | 4058256 | parenIndex = state->parenCount; |
| 564 | 4058256 | if (state->cp == state->cpend) { |
| 565 | /* | |
| 566 | * If we are at the end of the regexp and we're short one or more | |
| 567 | * operands, the regexp must have the form /x|/ or some such, with | |
| 568 | * left parentheses making us short more than one operand. | |
| 569 | */ | |
| 570 | 0 | if (operatorSP >= operandSP) { |
| 571 | 0 | operand = NewRENode(state, REOP_EMPTY); |
| 572 | 0 | if (!operand) |
| 573 | 0 | goto out; |
| 574 | 4058256 | goto pushOperand; |
| 575 | } | |
| 576 | } else { | |
| 577 | 4058256 | switch (*state->cp) { |
| 578 | case '(': | |
| 579 | 15386 | ++state->cp; |
| 580 | 15386 | if (state->cp + 1 < state->cpend && |
| 581 | *state->cp == '?' && | |
| 582 | (state->cp[1] == '=' || | |
| 583 | state->cp[1] == '!' || | |
| 584 | state->cp[1] == ':')) { | |
| 585 | 0 | switch (state->cp[1]) { |
| 586 | case '=': | |
| 587 | 0 | op = REOP_ASSERT; |
| 588 | /* ASSERT, <next>, ... ASSERTTEST */ | |
| 589 | 0 | state->progLength += 4; |
| 590 | 0 | break; |
| 591 | case '!': | |
| 592 | 0 | op = REOP_ASSERT_NOT; |
| 593 | /* ASSERTNOT, <next>, ... ASSERTNOTTEST */ | |
| 594 | 0 | state->progLength += 4; |
| 595 | 0 | break; |
| 596 | default: | |
| 597 | 0 | op = REOP_LPARENNON; |
| 598 | 0 | break; |
| 599 | } | |
| 600 | 0 | state->cp += 2; |
| 601 | } else { | |
| 602 | 15386 | op = REOP_LPAREN; |
| 603 | /* LPAREN, <index>, ... RPAREN, <index> */ | |
| 604 | 15386 | state->progLength |
| 605 | += 2 * (1 + GetCompactIndexWidth(parenIndex)); | |
| 606 | 15386 | state->parenCount++; |
| 607 | 15386 | if (state->parenCount == 65535) { |
| 608 | 0 | js_ReportCompileErrorNumber(state->context, |
| 609 | state->tokenStream, | |
| 610 | JSREPORT_TS | | |
| 611 | JSREPORT_ERROR, | |
| 612 | JSMSG_TOO_MANY_PARENS); | |
| 613 | 0 | goto out; |
| 614 | } | |
| 615 | } | |
| 616 | 0 | goto pushOperator; |
| 617 | ||
| 618 | case ')': | |
| 619 | /* | |
| 620 | * If there's no stacked open parenthesis, throw syntax error. | |
| 621 | */ | |
| 622 | 0 | for (i = operatorSP - 1; ; i--) { |
| 623 | 0 | if (i < 0) { |
| 624 | 0 | js_ReportCompileErrorNumber(state->context, |
| 625 | state->tokenStream, | |
| 626 | JSREPORT_TS | | |
| 627 | JSREPORT_ERROR, | |
| 628 | JSMSG_UNMATCHED_RIGHT_PAREN); | |
| 629 | 0 | goto out; |
| 630 | } | |
| 631 | 0 | if (operatorStack[i].op == REOP_ASSERT || |
| 632 | operatorStack[i].op == REOP_ASSERT_NOT || | |
| 633 | operatorStack[i].op == REOP_LPARENNON || | |
| 634 | operatorStack[i].op == REOP_LPAREN) { | |
| 635 | 0 | break; |
| 636 | } | |
| 637 | } | |
| 638 | /* FALL THROUGH */ | |
| 639 | ||
| 640 | case '|': | |
| 641 | /* Expected an operand before these, so make an empty one */ | |
| 642 | 0 | operand = NewRENode(state, REOP_EMPTY); |
| 643 | 0 | if (!operand) |
| 644 | 0 | goto out; |
| 645 | 4042870 | goto pushOperand; |
| 646 | ||
| 647 | default: | |
| 648 | 4042870 | if (!ParseTerm(state)) |
| 649 | 0 | goto out; |
| 650 | 4042870 | operand = state->result; |
| 651 | pushOperand: | |
| 652 | 4042870 | if (operandSP == operandStackSize) { |
| 653 | 0 | operandStackSize += operandStackSize; |
| 654 | 0 | operandStack = (RENode **) |
| 655 | JS_realloc(state->context, operandStack, | |
| 656 | sizeof(RENode *) * operandStackSize); | |
| 657 | 0 | if (!operandStack) |
| 658 | 0 | goto out; |
| 659 | } | |
| 660 | 4042870 | operandStack[operandSP++] = operand; |
| 661 | 4058256 | break; |
| 662 | } | |
| 663 | } | |
| 664 | ||
| 665 | /* At the end; process remaining operators. */ | |
| 666 | restartOperator: | |
| 667 | 4058256 | if (state->cp == state->cpend) { |
| 668 | 50446 | while (operatorSP) { |
| 669 | 34708 | --operatorSP; |
| 670 | 34708 | if (!ProcessOp(state, &operatorStack[operatorSP], |
| 671 | operandStack, operandSP)) | |
| 672 | 0 | goto out; |
| 673 | 34708 | --operandSP; |
| 674 | } | |
| 675 | 15738 | JS_ASSERT(operandSP == 1); |
| 676 | 15738 | state->result = operandStack[0]; |
| 677 | 15738 | result = JS_TRUE; |
| 678 | 15738 | goto out; |
| 679 | } | |
| 680 | ||
| 681 | 4042518 | switch (*state->cp) { |
| 682 | case '|': | |
| 683 | /* Process any stacked 'concat' operators */ | |
| 684 | 706348 | ++state->cp; |
| 685 | 3915526 | while (operatorSP && |
| 686 | operatorStack[operatorSP - 1].op == REOP_CONCAT) { | |
| 687 | 3209178 | --operatorSP; |
| 688 | 3209178 | if (!ProcessOp(state, &operatorStack[operatorSP], |
| 689 | operandStack, operandSP)) { | |
| 690 | 0 | goto out; |
| 691 | } | |
| 692 | 3209178 | --operandSP; |
| 693 | } | |
| 694 | 706348 | op = REOP_ALT; |
| 695 | 706348 | goto pushOperator; |
| 696 | ||
| 697 | case ')': | |
| 698 | /* | |
| 699 | * If there's no stacked open parenthesis, throw syntax error. | |
| 700 | */ | |
| 701 | 798632 | for (i = operatorSP - 1; ; i--) { |
| 702 | 798632 | if (i < 0) { |
| 703 | 0 | js_ReportCompileErrorNumber(state->context, |
| 704 | state->tokenStream, | |
| 705 | JSREPORT_TS | JSREPORT_ERROR, | |
| 706 | JSMSG_UNMATCHED_RIGHT_PAREN); | |
| 707 | 0 | goto out; |
| 708 | } | |
| 709 | 798632 | if (operatorStack[i].op == REOP_ASSERT || |
| 710 | operatorStack[i].op == REOP_ASSERT_NOT || | |
| 711 | operatorStack[i].op == REOP_LPARENNON || | |
| 712 | operatorStack[i].op == REOP_LPAREN) { | |
| 713 | 783246 | break; |
| 714 | } | |
| 715 | } | |
| 716 | 15386 | ++state->cp; |
| 717 | ||
| 718 | /* Process everything on the stack until the open parenthesis. */ | |
| 719 | 1581878 | for (;;) { |
| 720 | 798632 | JS_ASSERT(operatorSP); |
| 721 | 798632 | --operatorSP; |
| 722 | 798632 | switch (operatorStack[operatorSP].op) { |
| 723 | case REOP_ASSERT: | |
| 724 | case REOP_ASSERT_NOT: | |
| 725 | case REOP_LPAREN: | |
| 726 | 15386 | operand = NewRENode(state, operatorStack[operatorSP].op); |
| 727 | 15386 | if (!operand) |
| 728 | 0 | goto out; |
| 729 | 15386 | operand->u.parenIndex = |
| 730 | operatorStack[operatorSP].parenIndex; | |
| 731 | 15386 | JS_ASSERT(operandSP); |
| 732 | 15386 | operand->kid = operandStack[operandSP - 1]; |
| 733 | 15386 | operandStack[operandSP - 1] = operand; |
| 734 | 15386 | if (state->treeDepth == TREE_DEPTH_MAX) { |
| 735 | 0 | js_ReportCompileErrorNumber(state->context, |
| 736 | state->tokenStream, | |
| 737 | JSREPORT_TS | | |
| 738 | JSREPORT_ERROR, | |
| 739 | JSMSG_REGEXP_TOO_COMPLEX); | |
| 740 | 0 | goto out; |
| 741 | } | |
| 742 | 15386 | ++state->treeDepth; |
| 743 | /* FALL THROUGH */ | |
| 744 | ||
| 745 | case REOP_LPARENNON: | |
| 746 | 15386 | state->result = operandStack[operandSP - 1]; |
| 747 | 15386 | if (!ParseQuantifier(state)) |
| 748 | 0 | goto out; |
| 749 | 15386 | operandStack[operandSP - 1] = state->result; |
| 750 | 15386 | goto restartOperator; |
| 751 | default: | |
| 752 | 783246 | if (!ProcessOp(state, &operatorStack[operatorSP], |
| 753 | operandStack, operandSP)) | |
| 754 | 0 | goto out; |
| 755 | 783246 | --operandSP; |
| 756 | 783246 | break; |
| 757 | } | |
| 758 | } | |
| 759 | 0 | break; |
| 760 | ||
| 761 | case '{': | |
| 762 | { | |
| 763 | 0 | const jschar *errp = state->cp; |
| 764 | ||
| 765 | 0 | if (ParseMinMaxQuantifier(state, JS_TRUE) < 0) { |
| 766 | /* | |
| 767 | * This didn't even scan correctly as a quantifier, so we should | |
| 768 | * treat it as flat. | |
| 769 | */ | |
| 770 | 0 | op = REOP_CONCAT; |
| 771 | 0 | goto pushOperator; |
| 772 | } | |
| 773 | ||
| 774 | 0 | state->cp = errp; |
| 775 | /* FALL THROUGH */ | |
| 776 | } | |
| 777 | ||
| 778 | case '+': | |
| 779 | case '*': | |
| 780 | case '?': | |
| 781 | 0 | js_ReportCompileErrorNumberUC(state->context, state->tokenStream, |
| 782 | JSREPORT_TS | JSREPORT_ERROR, | |
| 783 | JSMSG_BAD_QUANTIFIER, state->cp); | |
| 784 | 0 | result = JS_FALSE; |
| 785 | 0 | goto out; |
| 786 | ||
| 787 | default: | |
| 788 | /* Anything else is the start of the next term. */ | |
| 789 | 3320784 | op = REOP_CONCAT; |
| 790 | pushOperator: | |
| 791 | 4042518 | if (operatorSP == operatorStackSize) { |
| 792 | 0 | operatorStackSize += operatorStackSize; |
| 793 | 0 | operatorStack = (REOpData *) |
| 794 | JS_realloc(state->context, operatorStack, | |
| 795 | sizeof(REOpData) * operatorStackSize); | |
| 796 | 0 | if (!operatorStack) |
| 797 | 0 | goto out; |
| 798 | } | |
| 799 | 4042518 | operatorStack[operatorSP].op = op; |
| 800 | 4042518 | operatorStack[operatorSP].errPos = state->cp; |
| 801 | 4042518 | operatorStack[operatorSP++].parenIndex = parenIndex; |
| 802 | 4042518 | break; |
| 803 | } | |
| 804 | } | |
| 805 | out: | |
| 806 | 15738 | if (operatorStack) |
| 807 | 15738 | JS_free(state->context, operatorStack); |
| 808 | 15738 | if (operandStack) |
| 809 | 15738 | JS_free(state->context, operandStack); |
| 810 | 15738 | return result; |
| 811 | } | |
| 812 | ||
| 813 | /* | |
| 814 | * Hack two bits in CompilerState.flags, for use within FindParenCount to flag | |
| 815 | * its being on the stack, and to propagate errors to its callers. | |
| 816 | */ | |
| 817 | #define JSREG_FIND_PAREN_COUNT 0x8000 | |
| 818 | #define JSREG_FIND_PAREN_ERROR 0x4000 | |
| 819 | ||
| 820 | /* | |
| 821 | * Magic return value from FindParenCount and GetDecimalValue, to indicate | |
| 822 | * overflow beyond GetDecimalValue's max parameter, or a computed maximum if | |
| 823 | * its findMax parameter is non-null. | |
| 824 | */ | |
| 825 | #define OVERFLOW_VALUE ((uintN)-1) | |
| 826 | ||
| 827 | static uintN | |
| 828 | FindParenCount(CompilerState *state) | |
| 829 | 0 | { |
| 830 | 0 | CompilerState temp; |
| 831 | 0 | int i; |
| 832 | ||
| 833 | 0 | if (state->flags & JSREG_FIND_PAREN_COUNT) |
| 834 | 0 | return OVERFLOW_VALUE; |
| 835 | ||
| 836 | /* | |
| 837 | * Copy state into temp, flag it so we never report an invalid backref, | |
| 838 | * and reset its members to parse the entire regexp. This is obviously | |
| 839 | * suboptimal, but GetDecimalValue calls us only if a backref appears to | |
| 840 | * refer to a forward parenthetical, which is rare. | |
| 841 | */ | |
| 842 | 0 | temp = *state; |
| 843 | 0 | temp.flags |= JSREG_FIND_PAREN_COUNT; |
| 844 | 0 | temp.cp = temp.cpbegin; |
| 845 | 0 | temp.parenCount = 0; |
| 846 | 0 | temp.classCount = 0; |
| 847 | 0 | temp.progLength = 0; |
| 848 | 0 | temp.treeDepth = 0; |
| 849 | 0 | temp.classBitmapsMem = 0; |
| 850 | 0 | for (i = 0; i < CLASS_CACHE_SIZE; i++) |
| 851 | 0 | temp.classCache[i].start = NULL; |
| 852 | ||
| 853 | 0 | if (!ParseRegExp(&temp)) { |
| 854 | 0 | state->flags |= JSREG_FIND_PAREN_ERROR; |
| 855 | 0 | return OVERFLOW_VALUE; |
| 856 | } | |
| 857 | 0 | return temp.parenCount; |
| 858 | } | |
| 859 | ||
| 860 | /* | |
| 861 | * Extract and return a decimal value at state->cp. The initial character c | |
| 862 | * has already been read. Return OVERFLOW_VALUE if the result exceeds max. | |
| 863 | * Callers who pass a non-null findMax should test JSREG_FIND_PAREN_ERROR in | |
| 864 | * state->flags to discover whether an error occurred under findMax. | |
| 865 | */ | |
| 866 | static uintN | |
| 867 | GetDecimalValue(jschar c, uintN max, uintN (*findMax)(CompilerState *state), | |
| 868 | CompilerState *state) | |
| 869 | 0 | { |
| 870 | 0 | uintN value = JS7_UNDEC(c); |
| 871 | 0 | JSBool overflow = (value > max && (!findMax || value > findMax(state))); |
| 872 | ||
| 873 | /* The following restriction allows simpler overflow checks. */ | |
| 874 | 0 | JS_ASSERT(max <= ((uintN)-1 - 9) / 10); |
| 875 | 0 | while (state->cp < state->cpend) { |
| 876 | 0 | c = *state->cp; |
| 877 | 0 | if (!JS7_ISDEC(c)) |
| 878 | 0 | break; |
| 879 | 0 | value = 10 * value + JS7_UNDEC(c); |
| 880 | 0 | if (!overflow && value > max && (!findMax || value > findMax(state))) |
| 881 | 0 | overflow = JS_TRUE; |
| 882 | 0 | ++state->cp; |
| 883 | } | |
| 884 | 0 | return overflow ? OVERFLOW_VALUE : value; |
| 885 | } | |
| 886 | ||
| 887 | /* | |
| 888 | * Calculate the total size of the bitmap required for a class expression. | |
| 889 | */ | |
| 890 | static JSBool | |
| 891 | CalculateBitmapSize(CompilerState *state, RENode *target, const jschar *src, | |
| 892 | const jschar *end) | |
| 893 | 0 | { |
| 894 | 0 | uintN max = 0; |
| 895 | 0 | JSBool inRange = JS_FALSE; |
| 896 | 0 | jschar c, rangeStart = 0; |
| 897 | 0 | uintN n, digit, nDigits, i; |
| 898 | ||
| 899 | 0 | target->u.ucclass.bmsize = 0; |
| 900 | 0 | target->u.ucclass.sense = JS_TRUE; |
| 901 | ||
| 902 | 0 | if (src == end) |
| 903 | 0 | return JS_TRUE; |
| 904 | ||
| 905 | 0 | if (*src == '^') { |
| 906 | 0 | ++src; |
| 907 | 0 | target->u.ucclass.sense = JS_FALSE; |
| 908 | } | |
| 909 | ||
| 910 | 0 | while (src != end) { |
| 911 | 0 | uintN localMax = 0; |
| 912 | 0 | switch (*src) { |
| 913 | case '\\': | |
| 914 | 0 | ++src; |
| 915 | 0 | c = *src++; |
| 916 | 0 | switch (c) { |
| 917 | case 'b': | |
| 918 | 0 | localMax = 0x8; |
| 919 | 0 | break; |
| 920 | case 'f': | |
| 921 | 0 | localMax = 0xC; |
| 922 | 0 | break; |
| 923 | case 'n': | |
| 924 | 0 | localMax = 0xA; |
| 925 | 0 | break; |
| 926 | case 'r': | |
| 927 | 0 | localMax = 0xD; |
| 928 | 0 | break; |
| 929 | case 't': | |
| 930 | 0 | localMax = 0x9; |
| 931 | 0 | break; |
| 932 | case 'v': | |
| 933 | 0 | localMax = 0xB; |
| 934 | 0 | break; |
| 935 | case 'c': | |
| 936 | 0 | if (src + 1 < end && RE_IS_LETTER(src[1])) |
| 937 | 0 | localMax = (jschar) (*src++ & 0x1F); |
| 938 | else | |
| 939 | 0 | localMax = '\\'; |
| 940 | 0 | break; |
| 941 | case 'x': | |
| 942 | 0 | nDigits = 2; |
| 943 | 0 | goto lexHex; |
| 944 | case 'u': | |
| 945 | 0 | nDigits = 4; |
| 946 | lexHex: | |
| 947 | 0 | n = 0; |
| 948 | 0 | for (i = 0; (i < nDigits) && (src < end); i++) { |
| 949 | 0 | c = *src++; |
| 950 | 0 | if (!isASCIIHexDigit(c, &digit)) { |
| 951 | /* | |
| 952 | * Back off to accepting the original | |
| 953 | *'\' as a literal. | |
| 954 | */ | |
| 955 | 0 | src -= i + 1; |
| 956 | 0 | n = '\\'; |
| 957 | 0 | break; |
| 958 | } | |
| 959 | 0 | n = (n << 4) | digit; |
| 960 | } | |
| 961 | 0 | localMax = n; |
| 962 | 0 | break; |
| 963 | case 'd': | |
| 964 | 0 | if (inRange) { |
| 965 | 0 | JS_ReportErrorNumber(state->context, |
| 966 | js_GetErrorMessage, NULL, | |
| 967 | JSMSG_BAD_CLASS_RANGE); | |
| 968 | 0 | return JS_FALSE; |
| 969 | } | |
| 970 | 0 | localMax = '9'; |
| 971 | 0 | break; |
| 972 | case 'D': | |
| 973 | case 's': | |
| 974 | case 'S': | |
| 975 | case 'w': | |
| 976 | case 'W': | |
| 977 | 0 | if (inRange) { |
| 978 | 0 | JS_ReportErrorNumber(state->context, |
| 979 | js_GetErrorMessage, NULL, | |
| 980 | JSMSG_BAD_CLASS_RANGE); | |
| 981 | 0 | return JS_FALSE; |
| 982 | } | |
| 983 | 0 | target->u.ucclass.bmsize = 65535; |
| 984 | 0 | return JS_TRUE; |
| 985 | case '0': | |
| 986 | case '1': | |
| 987 | case '2': | |
| 988 | case '3': | |
| 989 | case '4': | |
| 990 | case '5': | |
| 991 | case '6': | |
| 992 | case '7': | |
| 993 | /* | |
| 994 | * This is a non-ECMA extension - decimal escapes (in this | |
| 995 | * case, octal!) are supposed to be an error inside class | |
| 996 | * ranges, but supported here for backwards compatibility. | |
| 997 | * | |
| 998 | */ | |
| 999 | 0 | n = JS7_UNDEC(c); |
| 1000 | 0 | c = *src; |
| 1001 | 0 | if ('0' <= c && c <= '7') { |
| 1002 | 0 | src++; |
| 1003 | 0 | n = 8 * n + JS7_UNDEC(c); |
| 1004 | 0 | c = *src; |
| 1005 | 0 | if ('0' <= c && c <= '7') { |
| 1006 | 0 | src++; |
| 1007 | 0 | i = 8 * n + JS7_UNDEC(c); |
| 1008 | 0 | if (i <= 0377) |
| 1009 | 0 | n = i; |
| 1010 | else | |
| 1011 | 0 | src--; |
| 1012 | } | |
| 1013 | } | |
| 1014 | 0 | localMax = n; |
| 1015 | 0 | break; |
| 1016 | ||
| 1017 | default: | |
| 1018 | 0 | localMax = c; |
| 1019 | 0 | break; |
| 1020 | } | |
| 1021 | 0 | break; |
| 1022 | default: | |
| 1023 | 0 | localMax = *src++; |
| 1024 | 0 | break; |
| 1025 | } | |
| 1026 | 0 | if (inRange) { |
| 1027 | 0 | if (rangeStart > localMax) { |
| 1028 | 0 | JS_ReportErrorNumber(state->context, |
| 1029 | js_GetErrorMessage, NULL, | |
| 1030 | JSMSG_BAD_CLASS_RANGE); | |
| 1031 | 0 | return JS_FALSE; |
| 1032 | } | |
| 1033 | 0 | inRange = JS_FALSE; |
| 1034 | } else { | |
| 1035 | 0 | if (src < end - 1) { |
| 1036 | 0 | if (*src == '-') { |
| 1037 | 0 | ++src; |
| 1038 | 0 | inRange = JS_TRUE; |
| 1039 | 0 | rangeStart = (jschar)localMax; |
| 1040 | 0 | continue; |
| 1041 | } | |
| 1042 | } | |
| 1043 | } | |
| 1044 | 0 | if (state->flags & JSREG_FOLD) { |
| 1045 | 0 | c = JS_MAX(upcase((jschar)localMax), downcase((jschar)localMax)); |
| 1046 | 0 | if (c > localMax) |
| 1047 | 0 | localMax = c; |
| 1048 | } | |
| 1049 | 0 | if (localMax > max) |
| 1050 | 0 | max = localMax; |
| 1051 | } | |
| 1052 | 0 | target->u.ucclass.bmsize = max; |
| 1053 | 0 | return JS_TRUE; |
| 1054 | } | |
| 1055 | ||
| 1056 | /* | |
| 1057 | * item: assertion An item is either an assertion or | |
| 1058 | * quantatom a quantified atom. | |
| 1059 | * | |
| 1060 | * assertion: '^' Assertions match beginning of string | |
| 1061 | * (or line if the class static property | |
| 1062 | * RegExp.multiline is true). | |
| 1063 | * '$' End of string (or line if the class | |
| 1064 | * static property RegExp.multiline is | |
| 1065 | * true). | |
| 1066 | * '\b' Word boundary (between \w and \W). | |
| 1067 | * '\B' Word non-boundary. | |
| 1068 | * | |
| 1069 | * quantatom: atom An unquantified atom. | |
| 1070 | * quantatom '{' n ',' m '}' | |
| 1071 | * Atom must occur between n and m times. | |
| 1072 | * quantatom '{' n ',' '}' Atom must occur at least n times. | |
| 1073 | * quantatom '{' n '}' Atom must occur exactly n times. | |
| 1074 | * quantatom '*' Zero or more times (same as {0,}). | |
| 1075 | * quantatom '+' One or more times (same as {1,}). | |
| 1076 | * quantatom '?' Zero or one time (same as {0,1}). | |
| 1077 | * | |
| 1078 | * any of which can be optionally followed by '?' for ungreedy | |
| 1079 | * | |
| 1080 | * atom: '(' regexp ')' A parenthesized regexp (what matched | |
| 1081 | * can be addressed using a backreference, | |
| 1082 | * see '\' n below). | |
| 1083 | * '.' Matches any char except '\n'. | |
| 1084 | * '[' classlist ']' A character class. | |
| 1085 | * '[' '^' classlist ']' A negated character class. | |
| 1086 | * '\f' Form Feed. | |
| 1087 | * '\n' Newline (Line Feed). | |
| 1088 | * '\r' Carriage Return. | |
| 1089 | * '\t' Horizontal Tab. | |
| 1090 | * '\v' Vertical Tab. | |
| 1091 | * '\d' A digit (same as [0-9]). | |
| 1092 | * '\D' A non-digit. | |
| 1093 | * '\w' A word character, [0-9a-z_A-Z]. | |
| 1094 | * '\W' A non-word character. | |
| 1095 | * '\s' A whitespace character, [ \b\f\n\r\t\v]. | |
| 1096 | * '\S' A non-whitespace character. | |
| 1097 | * '\' n A backreference to the nth (n decimal | |
| 1098 | * and positive) parenthesized expression. | |
| 1099 | * '\' octal An octal escape sequence (octal must be | |
| 1100 | * two or three digits long, unless it is | |
| 1101 | * 0 for the null character). | |
| 1102 | * '\x' hex A hex escape (hex must be two digits). | |
| 1103 | * '\u' unicode A unicode escape (must be four digits). | |
| 1104 | * '\c' ctrl A control character, ctrl is a letter. | |
| 1105 | * '\' literalatomchar Any character except one of the above | |
| 1106 | * that follow '\' in an atom. | |
| 1107 | * otheratomchar Any character not first among the other | |
| 1108 | * atom right-hand sides. | |
| 1109 | */ | |
| 1110 | static JSBool | |
| 1111 | ParseTerm(CompilerState *state) | |
| 1112 | 4042870 | { |
| 1113 | 4042870 | jschar c = *state->cp++; |
| 1114 | 4042870 | uintN nDigits; |
| 1115 | 4042870 | uintN num, tmp, n, i; |
| 1116 | 4042870 | const jschar *termStart; |
| 1117 | ||
| 1118 | 4042870 | switch (c) { |
| 1119 | /* assertions and atoms */ | |
| 1120 | case '^': | |
| 1121 | 15418 | state->result = NewRENode(state, REOP_BOL); |
| 1122 | 15418 | if (!state->result) |
| 1123 | 0 | return JS_FALSE; |
| 1124 | 15418 | state->progLength++; |
| 1125 | 15418 | return JS_TRUE; |
| 1126 | case '$': | |
| 1127 | 15354 | state->result = NewRENode(state, REOP_EOL); |
| 1128 | 15354 | if (!state->result) |
| 1129 | 0 | return JS_FALSE; |
| 1130 | 15354 | state->progLength++; |
| 1131 | 15354 | return JS_TRUE; |
| 1132 | case '\\': | |
| 1133 | 352 | if (state->cp >= state->cpend) { |
| 1134 | /* a trailing '\' is an error */ | |
| 1135 | 0 | js_ReportCompileErrorNumber(state->context, state->tokenStream, |
| 1136 | JSREPORT_TS | JSREPORT_ERROR, | |
| 1137 | JSMSG_TRAILING_SLASH); | |
| 1138 | 0 | return JS_FALSE; |
| 1139 | } | |
| 1140 | 352 | c = *state->cp++; |
| 1141 | 352 | switch (c) { |
| 1142 | /* assertion escapes */ | |
| 1143 | case 'b' : | |
| 1144 | 0 | state->result = NewRENode(state, REOP_WBDRY); |
| 1145 | 0 | if (!state->result) |
| 1146 | 0 | return JS_FALSE; |
| 1147 | 0 | state->progLength++; |
| 1148 | 0 | return JS_TRUE; |
| 1149 | case 'B': | |
| 1150 | 0 | state->result = NewRENode(state, REOP_WNONBDRY); |
| 1151 | 0 | if (!state->result) |
| 1152 | 0 | return JS_FALSE; |
| 1153 | 0 | state->progLength++; |
| 1154 | 0 | return JS_TRUE; |
| 1155 | /* Decimal escape */ | |
| 1156 | case '0': | |
| 1157 | /* Give a strict warning. See also the note below. */ | |
| 1158 | 0 | if (!js_ReportCompileErrorNumber(state->context, |
| 1159 | state->tokenStream, | |
| 1160 | JSREPORT_TS | | |
| 1161 | JSREPORT_WARNING | | |
| 1162 | JSREPORT_STRICT, | |
| 1163 | JSMSG_INVALID_BACKREF)) { | |
| 1164 | 0 | return JS_FALSE; |
| 1165 | } | |
| 1166 | doOctal: | |
| 1167 | 0 | num = 0; |
| 1168 | 0 | while (state->cp < state->cpend) { |
| 1169 | 0 | c = *state->cp; |
| 1170 | 0 | if (c < '0' || '7' < c) |
| 1171 | 0 | break; |
| 1172 | 0 | state->cp++; |
| 1173 | 0 | tmp = 8 * num + (uintN)JS7_UNDEC(c); |
| 1174 | 0 | if (tmp > 0377) |
| 1175 | 0 | break; |
| 1176 | 0 | num = tmp; |
| 1177 | } | |
| 1178 | 0 | c = (jschar)num; |
| 1179 | doFlat: | |
| 1180 | 0 | state->result = NewRENode(state, REOP_FLAT); |
| 1181 | 0 | if (!state->result) |
| 1182 | 0 | return JS_FALSE; |
| 1183 | 0 | state->result->u.flat.chr = c; |
| 1184 | 0 | state->result->u.flat.length = 1; |
| 1185 | 0 | state->progLength += 3; |
| 1186 | 0 | break; |
| 1187 | case '1': | |
| 1188 | case '2': | |
| 1189 | case '3': | |
| 1190 | case '4': | |
| 1191 | case '5': | |
| 1192 | case '6': | |
| 1193 | case '7': | |
| 1194 | case '8': | |
| 1195 | case '9': | |
| 1196 | 0 | termStart = state->cp - 1; |
| 1197 | 0 | num = GetDecimalValue(c, state->parenCount, FindParenCount, state); |
| 1198 | 0 | if (state->flags & JSREG_FIND_PAREN_ERROR) |
| 1199 | 0 | return JS_FALSE; |
| 1200 | 0 | if (num == OVERFLOW_VALUE) { |
| 1201 | /* Give a strict mode warning. */ | |
| 1202 | 0 | if (!js_ReportCompileErrorNumber(state->context, |
| 1203 | state->tokenStream, | |
| 1204 | JSREPORT_TS | | |
| 1205 | JSREPORT_WARNING | | |
| 1206 | JSREPORT_STRICT, | |
| 1207 | (c >= '8') | |
| 1208 | ? JSMSG_INVALID_BACKREF | |
| 1209 | : JSMSG_BAD_BACKREF)) { | |
| 1210 | 0 | return JS_FALSE; |
| 1211 | } | |
| 1212 | ||
| 1213 | /* | |
| 1214 | * Note: ECMA 262, 15.10.2.9 says that we should throw a syntax | |
| 1215 | * error here. However, for compatibility with IE, we treat the | |
| 1216 | * whole backref as flat if the first character in it is not a | |
| 1217 | * valid octal character, and as an octal escape otherwise. | |
| 1218 | */ | |
| 1219 | 0 | state->cp = termStart; |
| 1220 | 0 | if (c >= '8') { |
| 1221 | /* Treat this as flat. termStart - 1 is the \. */ | |
| 1222 | 0 | c = '\\'; |
| 1223 | 0 | goto asFlat; |
| 1224 | } | |
| 1225 | ||
| 1226 | /* Treat this as an octal escape. */ | |
| 1227 | 0 | goto doOctal; |
| 1228 | } | |
| 1229 | 0 | JS_ASSERT(1 <= num && num <= 0x10000); |
| 1230 | 0 | state->result = NewRENode(state, REOP_BACKREF); |
| 1231 | 0 | if (!state->result) |
| 1232 | 0 | return JS_FALSE; |
| 1233 | 0 | state->result->u.parenIndex = num - 1; |
| 1234 | 0 | state->progLength |
| 1235 | += 1 + GetCompactIndexWidth(state->result->u.parenIndex); | |
| 1236 | 0 | break; |
| 1237 | /* Control escape */ | |
| 1238 | case 'f': | |
| 1239 | 0 | c = 0xC; |
| 1240 | 0 | goto doFlat; |
| 1241 | case 'n': | |
| 1242 | 0 | c = 0xA; |
| 1243 | 0 | goto doFlat; |
| 1244 | case 'r': | |
| 1245 | 0 | c = 0xD; |
| 1246 | 0 | goto doFlat; |
| 1247 | case 't': | |
| 1248 | 0 | c = 0x9; |
| 1249 | 0 | goto doFlat; |
| 1250 | case 'v': | |
| 1251 | 0 | c = 0xB; |
| 1252 | 0 | goto doFlat; |
| 1253 | /* Control letter */ | |
| 1254 | case 'c': | |
| 1255 | 0 | if (state->cp + 1 < state->cpend && RE_IS_LETTER(state->cp[1])) { |
| 1256 | 0 | c = (jschar) (*state->cp++ & 0x1F); |
| 1257 | } else { | |
| 1258 | /* back off to accepting the original '\' as a literal */ | |
| 1259 | 0 | --state->cp; |
| 1260 | 0 | c = '\\'; |
| 1261 | } | |
| 1262 | 0 | goto doFlat; |
| 1263 | /* HexEscapeSequence */ | |
| 1264 | case 'x': | |
| 1265 | 0 | nDigits = 2; |
| 1266 | 0 | goto lexHex; |
| 1267 | /* UnicodeEscapeSequence */ | |
| 1268 | case 'u': | |
| 1269 | 0 | nDigits = 4; |
| 1270 | lexHex: | |
| 1271 | 0 | n = 0; |
| 1272 | 0 | for (i = 0; i < nDigits && state->cp < state->cpend; i++) { |
| 1273 | 0 | uintN digit; |
| 1274 | 0 | c = *state->cp++; |
| 1275 | 0 | if (!isASCIIHexDigit(c, &digit)) { |
| 1276 | /* | |
| 1277 | * Back off to accepting the original 'u' or 'x' as a | |
| 1278 | * literal. | |
| 1279 | */ | |
| 1280 | 0 | state->cp -= i + 2; |
| 1281 | 0 | n = *state->cp++; |
| 1282 | 0 | break; |
| 1283 | } | |
| 1284 | 0 | n = (n << 4) | digit; |
| 1285 | } | |
| 1286 | 0 | c = (jschar) n; |
| 1287 | 0 | goto doFlat; |
| 1288 | /* Character class escapes */ | |
| 1289 | case 'd': | |
| 1290 | 0 | state->result = NewRENode(state, REOP_DIGIT); |
| 1291 | doSimple: | |
| 1292 | 64 | if (!state->result) |
| 1293 | 0 | return JS_FALSE; |
| 1294 | 64 | state->progLength++; |
| 1295 | 64 | break; |
| 1296 | case 'D': | |
| 1297 | 0 | state->result = NewRENode(state, REOP_NONDIGIT); |
| 1298 | 0 | goto doSimple; |
| 1299 | case 's': | |
| 1300 | 0 | state->result = NewRENode(state, REOP_SPACE); |
| 1301 | 0 | goto doSimple; |
| 1302 | case 'S': | |
| 1303 | 0 | state->result = NewRENode(state, REOP_NONSPACE); |
| 1304 | 0 | goto doSimple; |
| 1305 | case 'w': | |
| 1306 | 0 | state->result = NewRENode(state, REOP_ALNUM); |
| 1307 | 0 | goto doSimple; |
| 1308 | case 'W': | |
| 1309 | 0 | state->result = NewRENode(state, REOP_NONALNUM); |
| 1310 | 0 | goto doSimple; |
| 1311 | /* IdentityEscape */ | |
| 1312 | default: | |
| 1313 | 352 | state->result = NewRENode(state, REOP_FLAT); |
| 1314 | 352 | if (!state->result) |
| 1315 | 0 | return JS_FALSE; |
| 1316 | 352 | state->result->u.flat.chr = c; |
| 1317 | 352 | state->result->u.flat.length = 1; |
| 1318 | 352 | state->result->kid = (void *) (state->cp - 1); |
| 1319 | 352 | state->progLength += 3; |
| 1320 | 352 | break; |
| 1321 | } | |
| 1322 | 352 | break; |
| 1323 | case '[': | |
| 1324 | 0 | state->result = NewRENode(state, REOP_CLASS); |
| 1325 | 0 | if (!state->result) |
| 1326 | 0 | return JS_FALSE; |
| 1327 | 0 | termStart = state->cp; |
| 1328 | 0 | state->result->u.ucclass.startIndex = termStart - state->cpbegin; |
| 1329 | 0 | for (;;) { |
| 1330 | 0 | if (state->cp == state->cpend) { |
| 1331 | 0 | js_ReportCompileErrorNumberUC(state->context, state->tokenStream, |
| 1332 | JSREPORT_TS | JSREPORT_ERROR, | |
| 1333 | JSMSG_UNTERM_CLASS, termStart); | |
| 1334 | ||
| 1335 | 0 | return JS_FALSE; |
| 1336 | } | |
| 1337 | 0 | if (*state->cp == '\\') { |
| 1338 | 0 | state->cp++; |
| 1339 | 0 | if (state->cp != state->cpend) |
| 1340 | 0 | state->cp++; |
| 1341 | 0 | continue; |
| 1342 | } | |
| 1343 | 0 | if (*state->cp == ']') { |
| 1344 | 0 | state->result->u.ucclass.kidlen = state->cp - termStart; |
| 1345 | 0 | break; |
| 1346 | } | |
| 1347 | 0 | state->cp++; |
| 1348 | } | |
| 1349 | 0 | for (i = 0; i < CLASS_CACHE_SIZE; i++) { |
| 1350 | 0 | if (!state->classCache[i].start) { |
| 1351 | 0 | state->classCache[i].start = termStart; |
| 1352 | 0 | state->classCache[i].length = state->result->u.ucclass.kidlen; |
| 1353 | 0 | state->classCache[i].index = state->classCount; |
| 1354 | 0 | break; |
| 1355 | } | |
| 1356 | 0 | if (state->classCache[i].length == |
| 1357 | state->result->u.ucclass.kidlen) { | |
| 1358 | 0 | for (n = 0; ; n++) { |
| 1359 | 0 | if (n == state->classCache[i].length) { |
| 1360 | 0 | state->result->u.ucclass.index |
| 1361 | = state->classCache[i].index; | |
| 1362 | 0 | goto claim; |
| 1363 | } | |
| 1364 | 0 | if (state->classCache[i].start[n] != termStart[n]) |
| 1365 | 0 | break; |
| 1366 | } | |
| 1367 | } | |
| 1368 | } | |
| 1369 | 0 | state->result->u.ucclass.index = state->classCount++; |
| 1370 | ||
| 1371 | claim: | |
| 1372 | /* | |
| 1373 | * Call CalculateBitmapSize now as we want any errors it finds | |
| 1374 | * to be reported during the parse phase, not at execution. | |
| 1375 | */ | |
| 1376 | 0 | if (!CalculateBitmapSize(state, state->result, termStart, state->cp++)) |
| 1377 | 0 | return JS_FALSE; |
| 1378 | /* | |
| 1379 | * Update classBitmapsMem with number of bytes to hold bmsize bits, | |
| 1380 | * which is (bitsCount + 7) / 8 or (highest_bit + 1 + 7) / 8 | |
| 1381 | * or highest_bit / 8 + 1 where highest_bit is u.ucclass.bmsize. | |
| 1382 | */ | |
| 1383 | 0 | n = (state->result->u.ucclass.bmsize >> 3) + 1; |
| 1384 | 0 | if (n > CLASS_BITMAPS_MEM_LIMIT - state->classBitmapsMem) { |
| 1385 | 0 | js_ReportCompileErrorNumber(state->context, state->tokenStream, |
| 1386 | JSREPORT_TS | JSREPORT_ERROR, | |
| 1387 | JSMSG_REGEXP_TOO_COMPLEX); | |
| 1388 | 0 | return JS_FALSE; |
| 1389 | } | |
| 1390 | 0 | state->classBitmapsMem += n; |
| 1391 | /* CLASS, <index> */ | |
| 1392 | 0 | state->progLength |
| 1393 | += 1 + GetCompactIndexWidth(state->result->u.ucclass.index); | |
| 1394 | 0 | break; |
| 1395 | ||
| 1396 | case '.': | |
| 1397 | 64 | state->result = NewRENode(state, REOP_DOT); |
| 1398 | 64 | goto doSimple; |
| 1399 | ||
| 1400 | case '{': | |
| 1401 | { | |
| 1402 | 0 | const jschar *errp = state->cp--; |
| 1403 | 0 | intN err; |
| 1404 | ||
| 1405 | 0 | err = ParseMinMaxQuantifier(state, JS_TRUE); |
| 1406 | 0 | state->cp = errp; |
| 1407 | ||
| 1408 | 0 | if (err < 0) |
| 1409 | 0 | goto asFlat; |
| 1410 | ||
| 1411 | /* FALL THROUGH */ | |
| 1412 | } | |
| 1413 | case '*': | |
| 1414 | case '+': | |
| 1415 | case '?': | |
| 1416 | 0 | js_ReportCompileErrorNumberUC(state->context, state->tokenStream, |
| 1417 | JSREPORT_TS | JSREPORT_ERROR, | |
| 1418 | JSMSG_BAD_QUANTIFIER, state->cp - 1); | |
| 1419 | 0 | return JS_FALSE; |
| 1420 | default: | |
| 1421 | asFlat: | |
| 1422 | 4011682 | state->result = NewRENode(state, REOP_FLAT); |
| 1423 | 4011682 | if (!state->result) |
| 1424 | 0 | return JS_FALSE; |
| 1425 | 4011682 | state->result->u.flat.chr = c; |
| 1426 | 4011682 | state->result->u.flat.length = 1; |
| 1427 | 4011682 | state->result->kid = (void *) (state->cp - 1); |
| 1428 | 4011682 | state->progLength += 3; |
| 1429 | 4012098 | break; |
| 1430 | } | |
| 1431 | 4012098 | return ParseQuantifier(state); |
| 1432 | } | |
| 1433 | ||
| 1434 | static JSBool | |
| 1435 | ParseQuantifier(CompilerState *state) | |
| 1436 | 4027484 | { |
| 1437 | 4027484 | RENode *term; |
| 1438 | 4027484 | term = state->result; |
| 1439 | 4027484 | if (state->cp < state->cpend) { |
| 1440 | 4027100 | switch (*state->cp) { |
| 1441 | case '+': | |
| 1442 | 0 | state->result = NewRENode(state, REOP_QUANT); |
| 1443 | 0 | if (!state->result) |
| 1444 | 0 | return JS_FALSE; |
| 1445 | 0 | state->result->u.range.min = 1; |
| 1446 | 0 | state->result->u.range.max = (uintN)-1; |
| 1447 | /* <PLUS>, <next> ... <ENDCHILD> */ | |
| 1448 | 0 | state->progLength += 4; |
| 1449 | 0 | goto quantifier; |
| 1450 | case '*': | |
| 1451 | 0 | state->result = NewRENode(state, REOP_QUANT); |
| 1452 | 0 | if (!state->result) |
| 1453 | 0 | return JS_FALSE; |
| 1454 | 0 | state->result->u.range.min = 0; |
| 1455 | 0 | state->result->u.range.max = (uintN)-1; |
| 1456 | /* <STAR>, <next> ... <ENDCHILD> */ | |
| 1457 | 0 | state->progLength += 4; |
| 1458 | 0 | goto quantifier; |
| 1459 | case '?': | |
| 1460 | 0 | state->result = NewRENode(state, REOP_QUANT); |
| 1461 | 0 | if (!state->result) |
| 1462 | 0 | return JS_FALSE; |
| 1463 | 0 | state->result->u.range.min = 0; |
| 1464 | 0 | state->result->u.range.max = 1; |
| 1465 | /* <OPT>, <next> ... <ENDCHILD> */ | |
| 1466 | 0 | state->progLength += 4; |
| 1467 | 0 | goto quantifier; |
| 1468 | case '{': /* balance '}' */ | |
| 1469 | { | |
| 1470 | 0 | intN err; |
| 1471 | 0 | const jschar *errp = state->cp; |
| 1472 | ||
| 1473 | 0 | err = ParseMinMaxQuantifier(state, JS_FALSE); |
| 1474 | 0 | if (err == 0) |
| 1475 | 0 | goto quantifier; |
| 1476 | 0 | if (err == -1) |
| 1477 | 0 | return JS_TRUE; |
| 1478 | ||
| 1479 | 0 | js_ReportCompileErrorNumberUC(state->context, |
| 1480 | state->tokenStream, | |
| 1481 | JSREPORT_TS | JSREPORT_ERROR, | |
| 1482 | err, errp); | |
| 1483 | 0 | return JS_FALSE; |
| 1484 | } | |
| 1485 | default:; | |
| 1486 | } | |
| 1487 | } | |
| 1488 | 4027484 | return JS_TRUE; |
| 1489 | ||
| 1490 | quantifier: | |
| 1491 | 0 | if (state->treeDepth == TREE_DEPTH_MAX) { |
| 1492 | 0 | js_ReportCompileErrorNumber(state->context, state->tokenStream, |
| 1493 | JSREPORT_TS | JSREPORT_ERROR, | |
| 1494 | JSMSG_REGEXP_TOO_COMPLEX); | |
| 1495 | 0 | return JS_FALSE; |
| 1496 | } | |
| 1497 | ||
| 1498 | 0 | ++state->treeDepth; |
| 1499 | 0 | ++state->cp; |
| 1500 | 0 | state->result->kid = term; |
| 1501 | 0 | if (state->cp < state->cpend && *state->cp == '?') { |
| 1502 | 0 | ++state->cp; |
| 1503 | 0 | state->result->u.range.greedy = JS_FALSE; |
| 1504 | } else { | |
| 1505 | 0 | state->result->u.range.greedy = JS_TRUE; |
| 1506 | } | |
| 1507 | 0 | return JS_TRUE; |
| 1508 | } | |
| 1509 | ||
| 1510 | static intN | |
| 1511 | ParseMinMaxQuantifier(CompilerState *state, JSBool ignoreValues) | |
| 1512 | 0 | { |
| 1513 | 0 | uintN min, max; |
| 1514 | 0 | jschar c; |
| 1515 | 0 | const jschar *errp = state->cp++; |
| 1516 | ||
| 1517 | 0 | c = *state->cp; |
| 1518 | 0 | if (JS7_ISDEC(c)) { |
| 1519 | 0 | ++state->cp; |
| 1520 | 0 | min = GetDecimalValue(c, 0xFFFF, NULL, state); |
| 1521 | 0 | c = *state->cp; |
| 1522 | ||
| 1523 | 0 | if (!ignoreValues && min == OVERFLOW_VALUE) |
| 1524 | 0 | return JSMSG_MIN_TOO_BIG; |
| 1525 | ||
| 1526 | 0 | if (c == ',') { |
| 1527 | 0 | c = *++state->cp; |
| 1528 | 0 | if (JS7_ISDEC(c)) { |
| 1529 | 0 | ++state->cp; |
| 1530 | 0 | max = GetDecimalValue(c, 0xFFFF, NULL, state); |
| 1531 | 0 | c = *state->cp; |
| 1532 | 0 | if (!ignoreValues && max == OVERFLOW_VALUE) |
| 1533 | 0 | return JSMSG_MAX_TOO_BIG; |
| 1534 | 0 | if (!ignoreValues && min > max) |
| 1535 | 0 | return JSMSG_OUT_OF_ORDER; |
| 1536 | } else { | |
| 1537 | 0 | max = (uintN)-1; |
| 1538 | } | |
| 1539 | } else { | |
| 1540 | 0 | max = min; |
| 1541 | } | |
| 1542 | 0 | if (c == '}') { |
| 1543 | 0 | state->result = NewRENode(state, REOP_QUANT); |
| 1544 | 0 | if (!state->result) |
| 1545 | 0 | return JS_FALSE; |
| 1546 | 0 | state->result->u.range.min = min; |
| 1547 | 0 | state->result->u.range.max = max; |
| 1548 | /* | |
| 1549 | * QUANT, <min>, <max>, <next> ... <ENDCHILD> | |
| 1550 | * where <max> is written as compact(max+1) to make | |
| 1551 | * (uintN)-1 sentinel to occupy 1 byte, not width_of(max)+1. | |
| 1552 | */ | |
| 1553 | 0 | state->progLength += (1 + GetCompactIndexWidth(min) |
| 1554 | + GetCompactIndexWidth(max + 1) | |
| 1555 | +3); | |
| 1556 | 0 | return 0; |
| 1557 | } | |
| 1558 | } | |
| 1559 | ||
| 1560 | 0 | state->cp = errp; |
| 1561 | 0 | return -1; |
| 1562 | } | |
| 1563 | ||
| 1564 | static JSBool | |
| 1565 | SetForwardJumpOffset(jsbytecode *jump, jsbytecode *target) | |
| 1566 | 1428082 | { |
| 1567 | 1428082 | ptrdiff_t offset = target - jump; |
| 1568 | ||
| 1569 | /* Check that target really points forward. */ | |
| 1570 | 1428082 | JS_ASSERT(offset >= 2); |
| 1571 | 1428082 | if ((size_t)offset > OFFSET_MAX) |
| 1572 | 0 | return JS_FALSE; |
| 1573 | ||
| 1574 | 1428082 | jump[0] = JUMP_OFFSET_HI(offset); |
| 1575 | 1428082 | jump[1] = JUMP_OFFSET_LO(offset); |
| 1576 | 1428082 | return JS_TRUE; |
| 1577 | } | |
| 1578 | ||
| 1579 | /* | |
| 1580 | * Generate bytecode for the tree rooted at t using an explicit stack instead | |
| 1581 | * of recursion. | |
| 1582 | */ | |
| 1583 | static jsbytecode * | |
| 1584 | EmitREBytecode(CompilerState *state, JSRegExp *re, size_t treeDepth, | |
| 1585 | jsbytecode *pc, RENode *t) | |
| 1586 | 15754 | { |
| 1587 | 15754 | EmitStateStackEntry *emitStateSP, *emitStateStack; |
| 1588 | 15754 | RECharSet *charSet; |
| 1589 | 15754 | REOp op; |
| 1590 | ||
| 1591 | 15754 | if (treeDepth == 0) { |
| 1592 | 368 | emitStateStack = NULL; |
| 1593 | } else { | |
| 1594 | 15386 | emitStateStack = |
| 1595 | (EmitStateStackEntry *)JS_malloc(state->context, | |
| 1596 | sizeof(EmitStateStackEntry) * | |
| 1597 | treeDepth); | |
| 1598 | 15386 | if (!emitStateStack) |
| 1599 | 0 | return NULL; |
| 1600 | } | |
| 1601 | 15754 | emitStateSP = emitStateStack; |
| 1602 | 15754 | op = t->op; |
| 1603 | ||
| 1604 | 4331284 | for (;;) { |
| 1605 | 2903202 | *pc++ = op; |
| 1606 | 2903202 | switch (op) { |
| 1607 | case REOP_EMPTY: | |
| 1608 | 16 | --pc; |
| 1609 | 16 | break; |
| 1610 | ||
| 1611 | case REOP_ALTPREREQ2: | |
| 1612 | case REOP_ALTPREREQ: | |
| 1613 | 15386 | JS_ASSERT(emitStateSP); |
| 1614 | 15386 | emitStateSP->altHead = pc - 1; |
| 1615 | 15386 | emitStateSP->endTermFixup = pc; |
| 1616 | 15386 | pc += OFFSET_LEN; |
| 1617 | 15386 | SET_ARG(pc, t->u.altprereq.ch1); |
| 1618 | 15386 | pc += ARG_LEN; |
| 1619 | 15386 | SET_ARG(pc, t->u.altprereq.ch2); |
| 1620 | 15386 | pc += ARG_LEN; |
| 1621 | ||
| 1622 | 15386 | emitStateSP->nextAltFixup = pc; /* offset to next alternate */ |
| 1623 | 15386 | pc += OFFSET_LEN; |
| 1624 | ||
| 1625 | 15386 | emitStateSP->continueNode = t; |
| 1626 | 15386 | emitStateSP->continueOp = REOP_JUMP; |
| 1627 | 15386 | emitStateSP->jumpToJumpFlag = JS_FALSE; |
| 1628 | 15386 | ++emitStateSP; |
| 1629 | 15386 | JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth); |
| 1630 | 15386 | t = (RENode *) t->kid; |
| 1631 | 15386 | op = t->op; |
| 1632 | 15386 | continue; |
| 1633 | ||
| 1634 | case REOP_JUMP: | |
| 1635 | 706348 | emitStateSP->nextTermFixup = pc; /* offset to following term */ |
| 1636 | 706348 | pc += OFFSET_LEN; |
| 1637 | 706348 | if (!SetForwardJumpOffset(emitStateSP->nextAltFixup, pc)) |
| 1638 | 0 | goto jump_too_big; |
| 1639 | 706348 | emitStateSP->continueOp = REOP_ENDALT; |
| 1640 | 706348 | ++emitStateSP; |
| 1641 | 706348 | JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth); |
| 1642 | 706348 | t = t->u.kid2; |
| 1643 | 706348 | op = t->op; |
| 1644 | 706348 | continue; |
| 1645 | ||
| 1646 | case REOP_ENDALT: | |
| 1647 | /* | |
| 1648 | * If we already patched emitStateSP->nextTermFixup to jump to | |
| 1649 | * a nearer jump, to avoid 16-bit immediate offset overflow, we | |
| 1650 | * are done here. | |
| 1651 | */ | |
| 1652 | 706348 | if (emitStateSP->jumpToJumpFlag) |
| 1653 | 0 | break; |
| 1654 | ||
| 1655 | /* | |
| 1656 | * Fix up the REOP_JUMP offset to go to the op after REOP_ENDALT. | |
| 1657 | * REOP_ENDALT is executed only on successful match of the last | |
| 1658 | * alternate in a group. | |
| 1659 | */ | |
| 1660 | 706348 | if (!SetForwardJumpOffset(emitStateSP->nextTermFixup, pc)) |
| 1661 | 0 | goto jump_too_big; |
| 1662 | 706348 | if (t->op != REOP_ALT) { |
| 1663 | 15386 | if (!SetForwardJumpOffset(emitStateSP->endTermFixup, pc)) |
| 1664 | 0 | goto jump_too_big; |
| 1665 | } | |
| 1666 | ||
| 1667 | /* | |
| 1668 | * If the program is bigger than the REOP_JUMP offset range, then | |
| 1669 | * we must check for alternates before this one that are part of | |
| 1670 | * the same group, and fix up their jump offsets to target jumps | |
| 1671 | * close enough to fit in a 16-bit unsigned offset immediate. | |
| 1672 | */ | |
| 1673 | 706348 | if ((size_t)(pc - re->program) > OFFSET_MAX && |
| 1674 | emitStateSP > emitStateStack) { | |
| 1675 | 0 | EmitStateStackEntry *esp, *esp2; |
| 1676 | 0 | jsbytecode *alt, *jump; |
| 1677 | 0 | ptrdiff_t span, header; |
| 1678 | ||
| 1679 | 0 | esp2 = emitStateSP; |
| 1680 | 0 | alt = esp2->altHead; |
| 1681 | 0 | for (esp = esp2 - 1; esp >= emitStateStack; --esp) { |
| 1682 | 0 | if (esp->continueOp == REOP_ENDALT && |
| 1683 | !esp->jumpToJumpFlag && | |
| 1684 | esp->nextTermFixup + OFFSET_LEN == alt && | |
| 1685 | (size_t)(pc - ((esp->continueNode->op != REOP_ALT) | |
| 1686 | ? esp->endTermFixup | |
| 1687 | : esp->nextTermFixup)) > OFFSET_MAX) { | |
| 1688 | 0 | alt = esp->altHead; |
| 1689 | 0 | jump = esp->nextTermFixup; |
| 1690 | ||
| 1691 | /* | |
| 1692 | * The span must be 1 less than the distance from | |
| 1693 | * jump offset to jump offset, so we actually jump | |
| 1694 | * to a REOP_JUMP bytecode, not to its offset! | |
| 1695 | */ | |
| 1696 | 0 | for (;;) { |
| 1697 | 0 | JS_ASSERT(jump < esp2->nextTermFixup); |
| 1698 | 0 | span = esp2->nextTermFixup - jump - 1; |
| 1699 | 0 | if ((size_t)span <= OFFSET_MAX) |
| 1700 | 0 | break; |
| 1701 | 0 | do { |
| 1702 | 0 | if (--esp2 == esp) |
| 1703 | 0 | goto jump_too_big; |
| 1704 | 0 | } while (esp2->continueOp != REOP_ENDALT); |
| 1705 | } | |
| 1706 | ||
| 1707 | 0 | jump[0] = JUMP_OFFSET_HI(span); |
| 1708 | 0 | jump[1] = JUMP_OFFSET_LO(span); |
| 1709 | ||
| 1710 | 0 | if (esp->continueNode->op != REOP_ALT) { |
| 1711 | /* | |
| 1712 | * We must patch the offset at esp->endTermFixup | |
| 1713 | * as well, for the REOP_ALTPREREQ{,2} opcodes. | |
| 1714 | * If we're unlucky and endTermFixup is more than | |
| 1715 | * OFFSET_MAX bytes from its target, we cheat by | |
| 1716 | * jumping 6 bytes to the jump whose offset is at | |
| 1717 | * esp->nextTermFixup, which has the same target. | |
| 1718 | */ | |
| 1719 | 0 | jump = esp->endTermFixup; |
| 1720 | 0 | header = esp->nextTermFixup - jump; |
| 1721 | 0 | span += header; |
| 1722 | 0 | if ((size_t)span > OFFSET_MAX) |
| 1723 | 0 | span = header; |
| 1724 | ||
| 1725 | 0 | jump[0] = JUMP_OFFSET_HI(span); |
| 1726 | 0 | jump[1] = JUMP_OFFSET_LO(span); |
| 1727 | } | |
| 1728 | ||
| 1729 | 0 | esp->jumpToJumpFlag = JS_TRUE; |
| 1730 | } | |
| 1731 | } | |
| 1732 | } | |
| 1733 | 690962 | break; |
| 1734 | ||
| 1735 | case REOP_ALT: | |
| 1736 | 690962 | JS_ASSERT(emitStateSP); |
| 1737 | 690962 | emitStateSP->altHead = pc - 1; |
| 1738 | 690962 | emitStateSP->nextAltFixup = pc; /* offset to next alternate */ |
| 1739 | 690962 | pc += OFFSET_LEN; |
| 1740 | 690962 | emitStateSP->continueNode = t; |
| 1741 | 690962 | emitStateSP->continueOp = REOP_JUMP; |
| 1742 | 690962 | emitStateSP->jumpToJumpFlag = JS_FALSE; |
| 1743 | 690962 | ++emitStateSP; |
| 1744 | 690962 | JS_ASSERT((size_t)(emitStateSP - emitStateStack) <= treeDepth); |
| 1745 | 690962 | t = t->kid; |
| 1746 | 690962 | op = t->op; |
| 1747 | 690962 | continue; |
| 1748 | ||
| 1749 | case REOP_FLAT: | |
| 1750 | /* | |
| 1751 | * Coalesce FLATs if possible and if it would not increase bytecode | |
| 1752 | * beyond preallocated limit. The latter happens only when bytecode | |
| 1753 | * size for coalesced string with offset p and length 2 exceeds 6 | |
| 1754 | * bytes preallocated for 2 single char nodes, i.e. when | |
| 1755 | * 1 + GetCompactIndexWidth(p) + GetCompactIndexWidth(2) > 6 or | |
| 1756 | * GetCompactIndexWidth(p) > 4. | |
| 1757 | * Since when GetCompactIndexWidth(p) <= 4 coalescing of 3 or more | |
| 1758 | * nodes strictly decreases bytecode size, the check has to be | |
| 1759 | * done only for the first coalescing. | |
| 1760 | */ | |
| 1761 | 722534 | if (t->kid && |
| 1762 | &nb |