bytecode/StructureStubClearingWatchpoint.cpp

   1 /*
   2  * Copyright (C) 2012 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 "StructureStubClearingWatchpoint.h"
  28
  29 #if ENABLE(JIT)
  30
  31 #include "CodeBlock.h"
  32 #include "StructureStubInfo.h"
  33
  34 namespace JSC {
  35
  36 StructureStubClearingWatchpoint::~StructureStubClearingWatchpoint() { }
  37
  38 StructureStubClearingWatchpoint* StructureStubClearingWatchpoint::push(
  39     WatchpointsOnStructureStubInfo& holder,
  40     OwnPtr<StructureStubClearingWatchpoint>& head)
  41 {
  42     head = adoptPtr(new StructureStubClearingWatchpoint(holder, head.release()));
  43     return head.get();
  44 }
  45
  46 void StructureStubClearingWatchpoint::fireInternal()
  47 {
  48     // This will implicitly cause my own demise: stub reset removes all watchpoints.
  49     // That works, because deleting a watchpoint removes it from the set's list, and
  50     // the set's list traversal for firing is robust against the set changing.
  51     m_holder.codeBlock()->resetStub(*m_holder.stubInfo());
  52 }
  53
  54 WatchpointsOnStructureStubInfo::~WatchpointsOnStructureStubInfo()
  55 {
  56 }
  57
  58 StructureStubClearingWatchpoint* WatchpointsOnStructureStubInfo::addWatchpoint()
  59 {
  60     return StructureStubClearingWatchpoint::push(*this, m_head);
  61 }
  62
  63 StructureStubClearingWatchpoint* WatchpointsOnStructureStubInfo::ensureReferenceAndAddWatchpoint(
  64     RefPtr<WatchpointsOnStructureStubInfo>& holderRef, CodeBlock* codeBlock,
  65     StructureStubInfo* stubInfo)
  66 {
  67     if (!holderRef)
  68         holderRef = adoptRef(new WatchpointsOnStructureStubInfo(codeBlock, stubInfo));
  69     else {
  70         ASSERT(holderRef->m_codeBlock == codeBlock);
  71         ASSERT(holderRef->m_stubInfo == stubInfo);
  72     }
  73
  74     return holderRef->addWatchpoint();
  75 }
  76
  77 } // namespace JSC
  78
  79 #endif // ENABLE(JIT)
  80