dfg/DFGOSRExit.cpp

   1 /*
   2  * Copyright (C) 2011, 2013 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 "DFGOSRExit.h"
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "AssemblyHelpers.h"
  32 #include "DFGGraph.h"
  33 #include "DFGSpeculativeJIT.h"
  34 #include "JSCInlines.h"
  35
  36 namespace JSC { namespace DFG {
  37
  38 OSRExit::OSRExit(ExitKind kind, JSValueSource jsValueSource, MethodOfGettingAValueProfile valueProfile, SpeculativeJIT* jit, unsigned streamIndex, unsigned recoveryIndex)
  39     : OSRExitBase(kind, jit->m_codeOriginForExitTarget, jit->m_codeOriginForExitProfile)
  40     , m_jsValueSource(jsValueSource)
  41     , m_valueProfile(valueProfile)
  42     , m_patchableCodeOffset(0)
  43     , m_recoveryIndex(recoveryIndex)
  44     , m_streamIndex(streamIndex)
  45 {
  46     ASSERT(m_codeOrigin.isSet());
  47 }
  48
  49 void OSRExit::setPatchableCodeOffset(MacroAssembler::PatchableJump check)
  50 {
  51     m_patchableCodeOffset = check.m_jump.m_label.m_offset;
  52 }
  53
  54 MacroAssembler::Jump OSRExit::getPatchableCodeOffsetAsJump() const
  55 {
  56     return MacroAssembler::Jump(AssemblerLabel(m_patchableCodeOffset));
  57 }
  58
  59 CodeLocationJump OSRExit::codeLocationForRepatch(CodeBlock* dfgCodeBlock) const
  60 {
  61     return CodeLocationJump(dfgCodeBlock->jitCode()->dataAddressAtOffset(m_patchableCodeOffset));
  62 }
  63
  64 void OSRExit::correctJump(LinkBuffer& linkBuffer)
  65 {
  66     MacroAssembler::Label label;
  67     label.m_label.m_offset = m_patchableCodeOffset;
  68     m_patchableCodeOffset = linkBuffer.offsetOf(label);
  69 }
  70
  71 } } // namespace JSC::DFG
  72
  73 #endif // ENABLE(DFG_JIT)