1/* 2 * Copyright (C) 2013, 2014 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 "FTLJSCall.h" 28 29#if ENABLE(FTL_JIT) 30 31#include "DFGNode.h" 32#include "LinkBuffer.h" 33 34namespace JSC { namespace FTL { 35 36JSCall::JSCall() 37 : m_stackmapID(UINT_MAX) 38 , m_node(nullptr) 39 , m_callLinkInfo(nullptr) 40 , m_instructionOffset(UINT_MAX) 41{ 42} 43 44JSCall::JSCall(unsigned stackmapID, DFG::Node* node) 45 : m_stackmapID(stackmapID) 46 , m_node(node) 47 , m_callLinkInfo(nullptr) 48 , m_instructionOffset(0) 49{ 50} 51 52void JSCall::emit(CCallHelpers& jit) 53{ 54 m_callLinkInfo = jit.codeBlock()->addCallLinkInfo(); 55 56 CCallHelpers::Jump slowPath = jit.branchPtrWithPatch( 57 CCallHelpers::NotEqual, GPRInfo::regT0, m_targetToCheck, 58 CCallHelpers::TrustedImmPtr(0)); 59 60 jit.loadPtr( 61 CCallHelpers::Address(GPRInfo::regT0, JSFunction::offsetOfScopeChain()), 62 GPRInfo::regT1); 63 jit.store64( 64 GPRInfo::regT1, 65 CCallHelpers::Address( 66 CCallHelpers::stackPointerRegister, 67 sizeof(Register) * (JSStack::ScopeChain - JSStack::CallerFrameAndPCSize))); 68 69 m_fastCall = jit.nearCall(); 70 CCallHelpers::Jump done = jit.jump(); 71 72 slowPath.link(&jit); 73 74 jit.move(CCallHelpers::TrustedImmPtr(m_callLinkInfo), GPRInfo::regT2); 75 m_slowCall = jit.nearCall(); 76 77 done.link(&jit); 78} 79 80void JSCall::link(VM& vm, LinkBuffer& linkBuffer) 81{ 82 ThunkGenerator generator = linkThunkGeneratorFor( 83 m_node->op() == DFG::Construct ? CodeForConstruct : CodeForCall, 84 MustPreserveRegisters); 85 86 linkBuffer.link( 87 m_slowCall, FunctionPtr(vm.getCTIStub(generator).code().executableAddress())); 88 89 m_callLinkInfo->isFTL = true; 90 m_callLinkInfo->callType = m_node->op() == DFG::Construct ? CallLinkInfo::Construct : CallLinkInfo::Call; 91 m_callLinkInfo->codeOrigin = m_node->origin.semantic; 92 m_callLinkInfo->callReturnLocation = linkBuffer.locationOfNearCall(m_slowCall); 93 m_callLinkInfo->hotPathBegin = linkBuffer.locationOf(m_targetToCheck); 94 m_callLinkInfo->hotPathOther = linkBuffer.locationOfNearCall(m_fastCall); 95 m_callLinkInfo->calleeGPR = GPRInfo::regT0; 96} 97 98} } // namespace JSC::FTL 99 100#endif // ENABLE(FTL_JIT) 101 102