CallLinkStatus CallLinkStatus::computeFor(CodeBlock* profiledBlock, unsigned bytecodeIndex)
{
ConcurrentJITLocker locker(profiledBlock->m_lock);
UNUSED_PARAM(profiledBlock);
UNUSED_PARAM(bytecodeIndex);
#if ENABLE(JIT) && ENABLE(VALUE_PROFILER)
if (!profiledBlock->hasBaselineJITProfiling())
return computeFromLLInt(profiledBlock, bytecodeIndex);
if (profiledBlock->couldTakeSlowCase(bytecodeIndex))
return CallLinkStatus::takesSlowPath();
CallLinkInfo& callLinkInfo = profiledBlock->getCallLinkInfo(bytecodeIndex);
if (callLinkInfo.stub)
return CallLinkStatus(callLinkInfo.stub->executable(), callLinkInfo.stub->structure());
JSFunction* target = callLinkInfo.lastSeenCallee.get();
if (!target)
return computeFromLLInt(profiledBlock, bytecodeIndex);
if (callLinkInfo.hasSeenClosure)
return CallLinkStatus(target->executable(), target->structure());
return CallLinkStatus(target);
#else
return CallLinkStatus();
#endif
}
CallLinkStatus CallLinkStatus::computeFromLLInt(const ConcurrentJITLocker& locker, CodeBlock* profiledBlock, unsigned bytecodeIndex)
{
UNUSED_PARAM(profiledBlock);
UNUSED_PARAM(bytecodeIndex);
#if ENABLE(LLINT)
#if ENABLE(DFG_JIT)
if (profiledBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadFunction))) {
// We could force this to be a closure call, but instead we'll just assume that it
// takes slow path.
return takesSlowPath();
}
#else
UNUSED_PARAM(locker);
#endif
VM& vm = *profiledBlock->vm();
Instruction* instruction = profiledBlock->instructions().begin() + bytecodeIndex;
OpcodeID op = vm.interpreter->getOpcodeID(instruction[0].u.opcode);
if (op != op_call && op != op_construct)
return CallLinkStatus();
LLIntCallLinkInfo* callLinkInfo = instruction[5].u.callLinkInfo;
return CallLinkStatus(callLinkInfo->lastSeenCallee.get());
#else
return CallLinkStatus();
#endif
}
CallLinkStatus CallLinkStatus::computeFor(const ConcurrentJITLocker&, CallLinkInfo& callLinkInfo)
{
// Note that despite requiring that the locker is held, this code is racy with respect
// to the CallLinkInfo: it may get cleared while this code runs! This is because
// CallLinkInfo::unlink() may be called from a different CodeBlock than the one that owns
// the CallLinkInfo and currently we save space by not having CallLinkInfos know who owns
// them. So, there is no way for either the caller of CallLinkInfo::unlock() or unlock()
// itself to figure out which lock to lock.
//
// Fortunately, that doesn't matter. The only things we ask of CallLinkInfo - the slow
// path count, the stub, and the target - can all be asked racily. Stubs and targets can
// only be deleted at next GC, so if we load a non-null one, then it must contain data
// that is still marginally valid (i.e. the pointers ain't stale). This kind of raciness
// is probably OK for now.
if (callLinkInfo.slowPathCount >= Options::couldTakeSlowCaseMinimumCount())
return takesSlowPath();
if (ClosureCallStubRoutine* stub = callLinkInfo.stub.get())
return CallLinkStatus(stub->executable(), stub->structure());
JSFunction* target = callLinkInfo.lastSeenCallee.get();
if (!target)
return CallLinkStatus();
if (callLinkInfo.hasSeenClosure)
return CallLinkStatus(target->executable(), target->structure());
return CallLinkStatus(target);
}
CallLinkStatus CallLinkStatus::computeFromLLInt(CodeBlock* profiledBlock, unsigned bytecodeIndex)
{
UNUSED_PARAM(profiledBlock);
UNUSED_PARAM(bytecodeIndex);
#if ENABLE(LLINT)
Instruction* instruction = profiledBlock->instructions().begin() + bytecodeIndex;
LLIntCallLinkInfo* callLinkInfo = instruction[5].u.callLinkInfo;
return CallLinkStatus(callLinkInfo->lastSeenCallee.get());
#else
return CallLinkStatus();
#endif
}
CallLinkStatus CallLinkStatus::computeFor(
CodeBlock* profiledBlock, unsigned bytecodeIndex, const CallLinkInfoMap& map)
{
ConcurrentJITLocker locker(profiledBlock->m_lock);
UNUSED_PARAM(profiledBlock);
UNUSED_PARAM(bytecodeIndex);
UNUSED_PARAM(map);
#if ENABLE(DFG_JIT)
if (profiledBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadCache))
|| profiledBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadCacheWatchpoint))
|| profiledBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadExecutable)))
return takesSlowPath();
CallLinkInfo* callLinkInfo = map.get(CodeOrigin(bytecodeIndex));
if (!callLinkInfo)
return computeFromLLInt(locker, profiledBlock, bytecodeIndex);
CallLinkStatus result = computeFor(locker, *callLinkInfo);
if (!result)
return computeFromLLInt(locker, profiledBlock, bytecodeIndex);
if (profiledBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadFunction)))
result.makeClosureCall();
return result;
#else
return CallLinkStatus();
#endif
}
CallLinkStatus CallLinkStatus::computeFor(const ConcurrentJITLocker&, CallLinkInfo& callLinkInfo)
{
if (callLinkInfo.slowPathCount >= Options::couldTakeSlowCaseMinimumCount())
return takesSlowPath();
if (callLinkInfo.stub)
return CallLinkStatus(callLinkInfo.stub->executable(), callLinkInfo.stub->structure());
JSFunction* target = callLinkInfo.lastSeenCallee.get();
if (!target)
return CallLinkStatus();
if (callLinkInfo.hasSeenClosure)
return CallLinkStatus(target->executable(), target->structure());
return CallLinkStatus(target);
}
CallLinkStatus CallLinkStatus::computeFor(CodeBlock* profiledBlock, unsigned bytecodeIndex)
{
UNUSED_PARAM(profiledBlock);
UNUSED_PARAM(bytecodeIndex);
#if ENABLE(JIT) && ENABLE(VALUE_PROFILER)
if (!profiledBlock->numberOfCallLinkInfos())
return computeFromLLInt(profiledBlock, bytecodeIndex);
if (profiledBlock->couldTakeSlowCase(bytecodeIndex))
return CallLinkStatus(0, true);
CallLinkInfo& callLinkInfo = profiledBlock->getCallLinkInfo(bytecodeIndex);
JSFunction* target = callLinkInfo.lastSeenCallee.get();
if (!target)
return computeFromLLInt(profiledBlock, bytecodeIndex);
return CallLinkStatus(target, false, !!callLinkInfo.stub);
#else
return CallLinkStatus(0, false, false);
#endif
}
CallLinkStatus CallLinkStatus::computeFor(
CodeBlock* profiledBlock, unsigned bytecodeIndex, const CallLinkInfoMap& map)
{
ConcurrentJITLocker locker(profiledBlock->m_lock);
UNUSED_PARAM(profiledBlock);
UNUSED_PARAM(bytecodeIndex);
UNUSED_PARAM(map);
#if ENABLE(DFG_JIT)
ExitSiteData exitSiteData = computeExitSiteData(locker, profiledBlock, bytecodeIndex);
if (exitSiteData.m_takesSlowPath)
return takesSlowPath();
CallLinkInfo* callLinkInfo = map.get(CodeOrigin(bytecodeIndex));
if (!callLinkInfo)
return computeFromLLInt(locker, profiledBlock, bytecodeIndex);
return computeFor(locker, *callLinkInfo, exitSiteData);
#else
return CallLinkStatus();
#endif
}