bytecode/Watchpoint.cpp

   1 /*
   2  * Copyright (C) 2012, 2013, 2014 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 void StringFireDetail::dump(PrintStream& out) const
  35 {
  36     out.print(m_string);
  37 }
  38
  39 Watchpoint::~Watchpoint()
  40 {
  41     if (isOnList())
  42         remove();
  43 }
  44
  45 WatchpointSet::WatchpointSet(WatchpointState state)
  46     : m_state(state)
  47     , m_setIsNotEmpty(false)
  48 {
  49 }
  50
  51 WatchpointSet::~WatchpointSet()
  52 {
  53     // Remove all watchpoints, so that they don't try to remove themselves. Note that we
  54     // don't fire watchpoints on deletion. We assume that any code that is interested in
  55     // watchpoints already also separately has a mechanism to make sure that the code is
  56     // either keeping the watchpoint set's owner alive, or does some weak reference thing.
  57     while (!m_set.isEmpty())
  58         m_set.begin()->remove();
  59 }
  60
  61 void WatchpointSet::add(Watchpoint* watchpoint)
  62 {
  63     ASSERT(!isCompilationThread());
  64     ASSERT(state() != IsInvalidated);
  65     if (!watchpoint)
  66         return;
  67     m_set.push(watchpoint);
  68     m_setIsNotEmpty = true;
  69     m_state = IsWatched;
  70 }
  71
  72 void WatchpointSet::fireAllSlow(const FireDetail& detail)
  73 {
  74     ASSERT(state() == IsWatched);
  75
  76     WTF::storeStoreFence();
  77     fireAllWatchpoints(detail);
  78     m_state = IsInvalidated;
  79     WTF::storeStoreFence();
  80 }
  81
  82 void WatchpointSet::fireAllSlow(const char* reason)
  83 {
  84     fireAllSlow(StringFireDetail(reason));
  85 }
  86
  87 void WatchpointSet::fireAllWatchpoints(const FireDetail& detail)
  88 {
  89     while (!m_set.isEmpty())
  90         m_set.begin()->fire(detail);
  91 }
  92
  93 void InlineWatchpointSet::add(Watchpoint* watchpoint)
  94 {
  95     inflate()->add(watchpoint);
  96 }
  97
  98 void InlineWatchpointSet::fireAll(const char* reason)
  99 {
 100     fireAll(StringFireDetail(reason));
 101 }
 102
 103 WatchpointSet* InlineWatchpointSet::inflateSlow()
 104 {
 105     ASSERT(isThin());
 106     ASSERT(!isCompilationThread());
 107     WatchpointSet* fat = adoptRef(new WatchpointSet(decodeState(m_data))).leakRef();
 108     WTF::storeStoreFence();
 109     m_data = bitwise_cast<uintptr_t>(fat);
 110     return fat;
 111 }
 112
 113 void InlineWatchpointSet::freeFat()
 114 {
 115     ASSERT(isFat());
 116     fat()->deref();
 117 }
 118
 119 } // namespace JSC
 120