bytecode/CallLinkInfo.cpp

   1 /*
   2  * Copyright (C) 2012, 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 "CallLinkInfo.h"
  28
  29 #include "DFGOperations.h"
  30 #include "DFGThunks.h"
  31 #include "JSCInlines.h"
  32 #include "RepatchBuffer.h"
  33 #include <wtf/NeverDestroyed.h>
  34
  35 #if ENABLE(JIT)
  36 namespace JSC {
  37
  38 void CallLinkInfo::unlink(RepatchBuffer& repatchBuffer)
  39 {
  40     ASSERT(isLinked());
  41
  42     if (Options::showDisassembly())
  43         dataLog("Unlinking call from ", callReturnLocation, " to ", pointerDump(repatchBuffer.codeBlock()), "\n");
  44
  45     repatchBuffer.revertJumpReplacementToBranchPtrWithPatch(RepatchBuffer::startOfBranchPtrWithPatchOnRegister(hotPathBegin), static_cast<MacroAssembler::RegisterID>(calleeGPR), 0);
  46     repatchBuffer.relink(
  47         callReturnLocation,
  48         repatchBuffer.codeBlock()->vm()->getCTIStub(linkThunkGeneratorFor(
  49             (callType == Construct || callType == ConstructVarargs)? CodeForConstruct : CodeForCall,
  50             isFTL ? MustPreserveRegisters : RegisterPreservationNotRequired)).code());
  51     hasSeenShouldRepatch = false;
  52     callee.clear();
  53     stub.clear();
  54
  55     // It will be on a list if the callee has a code block.
  56     if (isOnList())
  57         remove();
  58 }
  59
  60 void CallLinkInfo::visitWeak(RepatchBuffer& repatchBuffer)
  61 {
  62     if (isLinked()) {
  63         if (stub) {
  64             if (!Heap::isMarked(stub->structure())
  65                 || !Heap::isMarked(stub->executable())) {
  66                 if (Options::verboseOSR()) {
  67                     dataLog(
  68                         "Clearing closure call from ", *repatchBuffer.codeBlock(), " to ",
  69                         stub->executable()->hashFor(specializationKind()),
  70                         ", stub routine ", RawPointer(stub.get()), ".\n");
  71                 }
  72                 unlink(repatchBuffer);
  73             }
  74         } else if (!Heap::isMarked(callee.get())) {
  75             if (Options::verboseOSR()) {
  76                 dataLog(
  77                     "Clearing call from ", *repatchBuffer.codeBlock(), " to ",
  78                     RawPointer(callee.get()), " (",
  79                     callee.get()->executable()->hashFor(specializationKind()),
  80                     ").\n");
  81             }
  82             unlink(repatchBuffer);
  83         }
  84     }
  85     if (!!lastSeenCallee && !Heap::isMarked(lastSeenCallee.get()))
  86         lastSeenCallee.clear();
  87 }
  88
  89 CallLinkInfo& CallLinkInfo::dummy()
  90 {
  91     static NeverDestroyed<CallLinkInfo> dummy;
  92     return dummy;
  93 }
  94
  95 } // namespace JSC
  96 #endif // ENABLE(JIT)
  97