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 "JSCInlines.h"
  33 #include "StructureStubInfo.h"
  34
  35 namespace JSC {
  36
  37 StructureStubClearingWatchpoint::~StructureStubClearingWatchpoint() { }
  38
  39 StructureStubClearingWatchpoint* StructureStubClearingWatchpoint::push(
  40     WatchpointsOnStructureStubInfo& holder,
  41     std::unique_ptr<StructureStubClearingWatchpoint>& head)
  42 {
  43     head = std::make_unique<StructureStubClearingWatchpoint>(holder, WTF::move(head));
  44     return head.get();
  45 }
  46
  47 void StructureStubClearingWatchpoint::fireInternal(const FireDetail&)
  48 {
  49     // This will implicitly cause my own demise: stub reset removes all watchpoints.
  50     // That works, because deleting a watchpoint removes it from the set's list, and
  51     // the set's list traversal for firing is robust against the set changing.
  52     m_holder.codeBlock()->resetStub(*m_holder.stubInfo());
  53 }
  54
  55 WatchpointsOnStructureStubInfo::~WatchpointsOnStructureStubInfo()
  56 {
  57 }
  58
  59 StructureStubClearingWatchpoint* WatchpointsOnStructureStubInfo::addWatchpoint()
  60 {
  61     return StructureStubClearingWatchpoint::push(*this, m_head);
  62 }
  63
  64 StructureStubClearingWatchpoint* WatchpointsOnStructureStubInfo::ensureReferenceAndAddWatchpoint(
  65     RefPtr<WatchpointsOnStructureStubInfo>& holderRef, CodeBlock* codeBlock,
  66     StructureStubInfo* stubInfo)
  67 {
  68     if (!holderRef)
  69         holderRef = adoptRef(new WatchpointsOnStructureStubInfo(codeBlock, stubInfo));
  70     else {
  71         ASSERT(holderRef->m_codeBlock == codeBlock);
  72         ASSERT(holderRef->m_stubInfo == stubInfo);
  73     }
  74
  75     return holderRef->addWatchpoint();
  76 }
  77
  78 } // namespace JSC
  79
  80 #endif // ENABLE(JIT)
  81