bytecode/CallLinkStatus.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 "CallLinkStatus.h"
  28
  29 #include "CodeBlock.h"
  30 #include "LLIntCallLinkInfo.h"
  31
  32 namespace JSC {
  33
  34 CallLinkStatus CallLinkStatus::computeFromLLInt(CodeBlock* profiledBlock, unsigned bytecodeIndex)
  35 {
  36     UNUSED_PARAM(profiledBlock);
  37     UNUSED_PARAM(bytecodeIndex);
  38 #if ENABLE(LLINT)
  39     Instruction* instruction = profiledBlock->instructions().begin() + bytecodeIndex;
  40     LLIntCallLinkInfo* callLinkInfo = instruction[4].u.callLinkInfo;
  41
  42     return CallLinkStatus(callLinkInfo->lastSeenCallee.get(), false);
  43 #else
  44     return CallLinkStatus(0, false);
  45 #endif
  46 }
  47
  48 CallLinkStatus CallLinkStatus::computeFor(CodeBlock* profiledBlock, unsigned bytecodeIndex)
  49 {
  50     UNUSED_PARAM(profiledBlock);
  51     UNUSED_PARAM(bytecodeIndex);
  52 #if ENABLE(JIT) && ENABLE(VALUE_PROFILER)
  53     if (!profiledBlock->numberOfCallLinkInfos())
  54         return computeFromLLInt(profiledBlock, bytecodeIndex);
  55
  56     if (profiledBlock->couldTakeSlowCase(bytecodeIndex))
  57         return CallLinkStatus(0, true);
  58
  59     JSFunction* target = profiledBlock->getCallLinkInfo(bytecodeIndex).lastSeenCallee.get();
  60     if (!target)
  61         return computeFromLLInt(profiledBlock, bytecodeIndex);
  62
  63     return CallLinkStatus(target, false);
  64 #else
  65     return CallLinkStatus(0, false);
  66 #endif
  67 }
  68
  69 } // namespace JSC
  70