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/*
* Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FTLJSCall.h"
#if ENABLE(FTL_JIT)
#include "DFGNode.h"
#include "LinkBuffer.h"
namespace JSC { namespace FTL {
JSCall::JSCall()
: m_stackmapID(UINT_MAX)
, m_node(nullptr)
, m_callLinkInfo(nullptr)
, m_instructionOffset(UINT_MAX)
{
}
JSCall::JSCall(unsigned stackmapID, DFG::Node* node)
: m_stackmapID(stackmapID)
, m_node(node)
, m_callLinkInfo(nullptr)
, m_instructionOffset(0)
{
}
void JSCall::emit(CCallHelpers& jit)
{
m_callLinkInfo = jit.codeBlock()->addCallLinkInfo();
CCallHelpers::Jump slowPath = jit.branchPtrWithPatch(
CCallHelpers::NotEqual, GPRInfo::regT0, m_targetToCheck,
CCallHelpers::TrustedImmPtr(0));
jit.loadPtr(
CCallHelpers::Address(GPRInfo::regT0, JSFunction::offsetOfScopeChain()),
GPRInfo::regT1);
jit.store64(
GPRInfo::regT1,
CCallHelpers::Address(
CCallHelpers::stackPointerRegister,
sizeof(Register) * (JSStack::ScopeChain - JSStack::CallerFrameAndPCSize)));
m_fastCall = jit.nearCall();
CCallHelpers::Jump done = jit.jump();
slowPath.link(&jit);
jit.move(CCallHelpers::TrustedImmPtr(m_callLinkInfo), GPRInfo::regT2);
m_slowCall = jit.nearCall();
done.link(&jit);
}
void JSCall::link(VM& vm, LinkBuffer& linkBuffer)
{
ThunkGenerator generator = linkThunkGeneratorFor(
m_node->op() == DFG::Construct ? CodeForConstruct : CodeForCall,
MustPreserveRegisters);
linkBuffer.link(
m_slowCall, FunctionPtr(vm.getCTIStub(generator).code().executableAddress()));
m_callLinkInfo->isFTL = true;
m_callLinkInfo->callType = m_node->op() == DFG::Construct ? CallLinkInfo::Construct : CallLinkInfo::Call;
m_callLinkInfo->codeOrigin = m_node->origin.semantic;
m_callLinkInfo->callReturnLocation = linkBuffer.locationOfNearCall(m_slowCall);
m_callLinkInfo->hotPathBegin = linkBuffer.locationOf(m_targetToCheck);
m_callLinkInfo->hotPathOther = linkBuffer.locationOfNearCall(m_fastCall);
m_callLinkInfo->calleeGPR = GPRInfo::regT0;
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
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