yarr/RegexJIT.h

   1 /*
   2  * Copyright (C) 2009 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 #ifndef RegexJIT_h
  27 #define RegexJIT_h
  28
  29 #if ENABLE(YARR_JIT)
  30
  31 #include "MacroAssembler.h"
  32 #include "RegexPattern.h"
  33 #include <UString.h>
  34
  35 #include <pcre.h>
  36 struct JSRegExp; // temporary, remove when fallback is removed.
  37
  38 #if CPU(X86) && !COMPILER(MSVC)
  39 #define YARR_CALL __attribute__ ((regparm (3)))
  40 #else
  41 #define YARR_CALL
  42 #endif
  43
  44 namespace JSC {
  45
  46 class JSGlobalData;
  47 class ExecutablePool;
  48
  49 namespace Yarr {
  50
  51 class RegexCodeBlock {
  52     typedef int (*RegexJITCode)(const UChar* input, unsigned start, unsigned length, int* output) YARR_CALL;
  53
  54 public:
  55     RegexCodeBlock()
  56         : m_fallback(0)
  57     {
  58     }
  59
  60     ~RegexCodeBlock()
  61     {
  62         if (m_fallback)
  63             jsRegExpFree(m_fallback);
  64     }
  65
  66     JSRegExp* getFallback() { return m_fallback; }
  67     void setFallback(JSRegExp* fallback) { m_fallback = fallback; }
  68
  69     bool operator!() { return (!m_ref.m_code.executableAddress() && !m_fallback); }
  70     void set(MacroAssembler::CodeRef ref) { m_ref = ref; }
  71
  72     int execute(const UChar* input, unsigned start, unsigned length, int* output)
  73     {
  74         return reinterpret_cast<RegexJITCode>(m_ref.m_code.executableAddress())(input, start, length, output);
  75     }
  76
  77 private:
  78     MacroAssembler::CodeRef m_ref;
  79     JSRegExp* m_fallback;
  80 };
  81
  82 void jitCompileRegex(JSGlobalData* globalData, RegexCodeBlock& jitObject, const UString& pattern, unsigned& numSubpatterns, const char*& error, bool ignoreCase = false, bool multiline = false);
  83
  84 inline int executeRegex(RegexCodeBlock& jitObject, const UChar* input, unsigned start, unsigned length, int* output, int outputArraySize)
  85 {
  86     if (JSRegExp* fallback = jitObject.getFallback())
  87         return (jsRegExpExecute(fallback, input, length, start, output, outputArraySize) < 0) ? -1 : output[0];
  88
  89     return jitObject.execute(input, start, length, output);
  90 }
  91
  92 } } // namespace JSC::Yarr
  93
  94 #endif
  95
  96 #endif // RegexJIT_h