bytecode/Watchpoint.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 "Watchpoint.h"
  28
  29 #include "LinkBuffer.h"
  30 #include <wtf/PassRefPtr.h>
  31
  32 namespace JSC {
  33
  34 Watchpoint::~Watchpoint()
  35 {
  36     if (isOnList())
  37         remove();
  38 }
  39
  40 WatchpointSet::WatchpointSet(InitialWatchpointSetMode mode)
  41     : m_isWatched(mode == InitializedWatching)
  42     , m_isInvalidated(false)
  43 {
  44 }
  45
  46 WatchpointSet::~WatchpointSet()
  47 {
  48     // Fire all watchpoints. This is necessary because it is possible, say with
  49     // structure watchpoints, for the watchpoint set owner to die while the
  50     // watchpoint owners are still live.
  51     fireAllWatchpoints();
  52 }
  53
  54 void WatchpointSet::add(Watchpoint* watchpoint)
  55 {
  56     if (!watchpoint)
  57         return;
  58     m_set.push(watchpoint);
  59     m_isWatched = true;
  60 }
  61
  62 void WatchpointSet::notifyWriteSlow()
  63 {
  64     ASSERT(m_isWatched);
  65
  66     fireAllWatchpoints();
  67     m_isWatched = false;
  68     m_isInvalidated = true;
  69 }
  70
  71 void WatchpointSet::fireAllWatchpoints()
  72 {
  73     while (!m_set.isEmpty())
  74         m_set.begin()->fire();
  75 }
  76
  77 void InlineWatchpointSet::add(Watchpoint* watchpoint)
  78 {
  79     inflate()->add(watchpoint);
  80 }
  81
  82 WatchpointSet* InlineWatchpointSet::inflateSlow()
  83 {
  84     ASSERT(isThin());
  85     WatchpointSet* fat = adoptRef(new WatchpointSet(InitializedBlind)).leakRef();
  86     if (m_data & IsInvalidatedFlag)
  87         fat->m_isInvalidated = true;
  88     if (m_data & IsWatchedFlag)
  89         fat->m_isWatched = true;
  90     m_data = bitwise_cast<uintptr_t>(fat);
  91     return fat;
  92 }
  93
  94 void InlineWatchpointSet::freeFat()
  95 {
  96     ASSERT(isFat());
  97     fat()->deref();
  98 }
  99
 100 } // namespace JSC
 101