bytecode/MethodCallLinkStatus.cpp

   1 /*
   2  * Copyright (C) 2012 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 "MethodCallLinkStatus.h"
  28
  29 #include "CodeBlock.h"
  30
  31 namespace JSC {
  32
  33 MethodCallLinkStatus MethodCallLinkStatus::computeFor(CodeBlock* profiledBlock, unsigned bytecodeIndex)
  34 {
  35     UNUSED_PARAM(profiledBlock);
  36     UNUSED_PARAM(bytecodeIndex);
  37 #if ENABLE(JIT) && ENABLE(VALUE_PROFILER)
  38     // NOTE: This does not have an LLInt fall-back because LLInt does not do any method
  39     // call link caching.
  40     if (!profiledBlock->numberOfMethodCallLinkInfos())
  41         return MethodCallLinkStatus();
  42
  43     MethodCallLinkInfo& methodCall = profiledBlock->getMethodCallLinkInfo(bytecodeIndex);
  44
  45     if (!methodCall.seen || !methodCall.cachedStructure)
  46         return MethodCallLinkStatus();
  47
  48     if (methodCall.cachedPrototype.get() == profiledBlock->globalObject()->methodCallDummy()) {
  49         return MethodCallLinkStatus(
  50             methodCall.cachedStructure.get(),
  51             0,
  52             methodCall.cachedFunction.get(),
  53             0);
  54     }
  55
  56     return MethodCallLinkStatus(
  57         methodCall.cachedStructure.get(),
  58         methodCall.cachedPrototypeStructure.get(),
  59         methodCall.cachedFunction.get(),
  60         methodCall.cachedPrototype.get());
  61 #else // ENABLE(JIT)
  62     return MethodCallLinkStatus();
  63 #endif // ENABLE(JIT)
  64 }
  65
  66 } // namespace JSC