bytecode/MethodOfGettingAValueProfile.cpp

   1 /*
   2  * Copyright (C) 2012, 2013 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 "MethodOfGettingAValueProfile.h"
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "CodeBlock.h"
  32 #include "JSCInlines.h"
  33
  34 namespace JSC {
  35
  36 MethodOfGettingAValueProfile MethodOfGettingAValueProfile::fromLazyOperand(
  37     CodeBlock* codeBlock, const LazyOperandValueProfileKey& key)
  38 {
  39     MethodOfGettingAValueProfile result;
  40     result.m_kind = LazyOperand;
  41     result.u.lazyOperand.codeBlock = codeBlock;
  42     result.u.lazyOperand.bytecodeOffset = key.bytecodeOffset();
  43     result.u.lazyOperand.operand = key.operand().offset();
  44     return result;
  45 }
  46
  47 EncodedJSValue* MethodOfGettingAValueProfile::getSpecFailBucket(unsigned index) const
  48 {
  49     switch (m_kind) {
  50     case None:
  51         return 0;
  52
  53     case Ready:
  54         return u.profile->specFailBucket(index);
  55
  56     case LazyOperand: {
  57         LazyOperandValueProfileKey key(u.lazyOperand.bytecodeOffset, VirtualRegister(u.lazyOperand.operand));
  58
  59         ConcurrentJITLocker locker(u.lazyOperand.codeBlock->m_lock);
  60         LazyOperandValueProfile* profile =
  61             u.lazyOperand.codeBlock->lazyOperandValueProfiles().add(locker, key);
  62         return profile->specFailBucket(index);
  63     }
  64
  65     default:
  66         RELEASE_ASSERT_NOT_REACHED();
  67         return 0;
  68     }
  69 }
  70
  71 } // namespace JSC
  72
  73 #endif // ENABLE(DFG_JIT)
  74