bytecode/Watchpoint.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 "Watchpoint.h"
  28
  29 #include <wtf/CompilationThread.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(WatchpointState state)
  41     : m_state(state)
  42     , m_setIsNotEmpty(false)
  43 {
  44 }
  45
  46 WatchpointSet::~WatchpointSet()
  47 {
  48     // Remove all watchpoints, so that they don't try to remove themselves. Note that we
  49     // don't fire watchpoints on deletion. We assume that any code that is interested in
  50     // watchpoints already also separately has a mechanism to make sure that the code is
  51     // either keeping the watchpoint set's owner alive, or does some weak reference thing.
  52     while (!m_set.isEmpty())
  53         m_set.begin()->remove();
  54 }
  55
  56 void WatchpointSet::add(Watchpoint* watchpoint)
  57 {
  58     ASSERT(!isCompilationThread());
  59     ASSERT(state() != IsInvalidated);
  60     if (!watchpoint)
  61         return;
  62     m_set.push(watchpoint);
  63     m_setIsNotEmpty = true;
  64     m_state = IsWatched;
  65 }
  66
  67 void WatchpointSet::fireAllSlow()
  68 {
  69     ASSERT(state() == IsWatched);
  70
  71     WTF::storeStoreFence();
  72     fireAllWatchpoints();
  73     m_state = IsInvalidated;
  74     WTF::storeStoreFence();
  75 }
  76
  77 void WatchpointSet::fireAllWatchpoints()
  78 {
  79     while (!m_set.isEmpty())
  80         m_set.begin()->fire();
  81 }
  82
  83 void InlineWatchpointSet::add(Watchpoint* watchpoint)
  84 {
  85     inflate()->add(watchpoint);
  86 }
  87
  88 WatchpointSet* InlineWatchpointSet::inflateSlow()
  89 {
  90     ASSERT(isThin());
  91     ASSERT(!isCompilationThread());
  92     WatchpointSet* fat = adoptRef(new WatchpointSet(decodeState(m_data))).leakRef();
  93     WTF::storeStoreFence();
  94     m_data = bitwise_cast<uintptr_t>(fat);
  95     return fat;
  96 }
  97
  98 void InlineWatchpointSet::freeFat()
  99 {
 100     ASSERT(isFat());
 101     fat()->deref();
 102 }
 103
 104 } // namespace JSC
 105