ftl/FTLJSCallBase.cpp

   1 /*
   2  * Copyright (C) 2015 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 "FTLJSCallBase.h"
  28
  29 #if ENABLE(FTL_JIT)
  30
  31 #include "DFGNode.h"
  32 #include "LinkBuffer.h"
  33
  34 namespace JSC { namespace FTL {
  35
  36 using namespace DFG;
  37
  38 JSCallBase::JSCallBase()
  39     : m_type(CallLinkInfo::None)
  40     , m_callLinkInfo(nullptr)
  41 {
  42 }
  43
  44 JSCallBase::JSCallBase(CallLinkInfo::CallType type, CodeOrigin origin)
  45     : m_type(type)
  46     , m_origin(origin)
  47     , m_callLinkInfo(nullptr)
  48 {
  49 }
  50
  51 void JSCallBase::emit(CCallHelpers& jit)
  52 {
  53     m_callLinkInfo = jit.codeBlock()->addCallLinkInfo();
  54
  55     CCallHelpers::Jump slowPath = jit.branchPtrWithPatch(
  56         CCallHelpers::NotEqual, GPRInfo::regT0, m_targetToCheck,
  57         CCallHelpers::TrustedImmPtr(0));
  58
  59     m_fastCall = jit.nearCall();
  60     CCallHelpers::Jump done = jit.jump();
  61
  62     slowPath.link(&jit);
  63
  64     jit.move(CCallHelpers::TrustedImmPtr(m_callLinkInfo), GPRInfo::regT2);
  65     m_slowCall = jit.nearCall();
  66
  67     done.link(&jit);
  68 }
  69
  70 void JSCallBase::link(VM& vm, LinkBuffer& linkBuffer)
  71 {
  72     ThunkGenerator generator = linkThunkGeneratorFor(
  73         CallLinkInfo::specializationKindFor(m_type), MustPreserveRegisters);
  74
  75     linkBuffer.link(
  76         m_slowCall, FunctionPtr(vm.getCTIStub(generator).code().executableAddress()));
  77
  78     m_callLinkInfo->setUpCallFromFTL(m_type, m_origin, linkBuffer.locationOfNearCall(m_slowCall),
  79         linkBuffer.locationOf(m_targetToCheck), linkBuffer.locationOfNearCall(m_fastCall),
  80         GPRInfo::regT0);
  81 }
  82
  83 } } // namespace JSC::FTL
  84
  85 #endif // ENABLE(FTL_JIT)
  86