wrec/WREC.cpp

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "WREC.h"
  28
  29 #if ENABLE(WREC)
  30
  31 #include "CharacterClassConstructor.h"
  32 #include "Interpreter.h"
  33 #include "JSGlobalObject.h"
  34 #include "RegisterFile.h"
  35 #include "WRECFunctors.h"
  36 #include "WRECParser.h"
  37 #include "pcre_internal.h"
  38
  39 using namespace WTF;
  40
  41 namespace JSC { namespace WREC {
  42
  43 CompiledRegExp Generator::compileRegExp(JSGlobalData* globalData, const UString& pattern, unsigned* numSubpatterns_ptr, const char** error_ptr, RefPtr<ExecutablePool>& pool, bool ignoreCase, bool multiline)
  44 {
  45     if (pattern.size() > MAX_PATTERN_SIZE) {
  46         *error_ptr = "regular expression too large";
  47         return 0;
  48     }
  49
  50     Parser parser(pattern, ignoreCase, multiline);
  51     Generator& generator = parser.generator();
  52     MacroAssembler::JumpList failures;
  53     MacroAssembler::Jump endOfInput;
  54
  55     generator.generateEnter();
  56     generator.generateSaveIndex();
  57
  58     Label beginPattern(&generator);
  59     parser.parsePattern(failures);
  60     generator.generateReturnSuccess();
  61
  62     failures.link(&generator);
  63     generator.generateIncrementIndex(&endOfInput);
  64     parser.parsePattern(failures);
  65     generator.generateReturnSuccess();
  66
  67     failures.link(&generator);
  68     generator.generateIncrementIndex();
  69     generator.generateJumpIfNotEndOfInput(beginPattern);
  70
  71     endOfInput.link(&generator);
  72     generator.generateReturnFailure();
  73
  74     if (parser.error()) {
  75         *error_ptr = parser.syntaxError(); // NULL in the case of patterns that WREC doesn't support yet.
  76         return 0;
  77     }
  78
  79     *numSubpatterns_ptr = parser.numSubpatterns();
  80     pool = globalData->poolForSize(generator.size());
  81     return reinterpret_cast<CompiledRegExp>(generator.copyCode(pool.get()));
  82 }
  83
  84 } } // namespace JSC::WREC
  85
  86 #endif // ENABLE(WREC)