ftl/FTLJSCall.cpp

   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
  34 namespace JSC { namespace FTL {
  35
  36 JSCall::JSCall()
  37     : m_stackmapID(UINT_MAX)
  38     , m_node(nullptr)
  39     , m_callLinkInfo(nullptr)
  40     , m_instructionOffset(UINT_MAX)
  41 {
  42 }
  43
  44 JSCall::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
  52 void 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
  80 void 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