JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / bytecode / Watchpoint.cpp

diff --git a/bytecode/Watchpoint.cpp b/bytecode/Watchpoint.cpp
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+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "Watchpoint.h"
+
+#include "LinkBuffer.h"
+#include <wtf/PassRefPtr.h>
+
+namespace JSC {
+
+Watchpoint::~Watchpoint()
+{
+    if (isOnList())
+        remove();
+}
+
+WatchpointSet::WatchpointSet(InitialWatchpointSetMode mode)
+    : m_isWatched(mode == InitializedWatching)
+    , m_isInvalidated(false)
+{
+}
+
+WatchpointSet::~WatchpointSet()
+{
+    // Fire all watchpoints. This is necessary because it is possible, say with
+    // structure watchpoints, for the watchpoint set owner to die while the
+    // watchpoint owners are still live.
+    fireAllWatchpoints();
+}
+
+void WatchpointSet::add(Watchpoint* watchpoint)
+{
+    if (!watchpoint)
+        return;
+    m_set.push(watchpoint);
+    m_isWatched = true;
+}
+
+void WatchpointSet::notifyWriteSlow()
+{
+    ASSERT(m_isWatched);
+    
+    fireAllWatchpoints();
+    m_isWatched = false;
+    m_isInvalidated = true;
+}
+
+void WatchpointSet::fireAllWatchpoints()
+{
+    while (!m_set.isEmpty())
+        m_set.begin()->fire();
+}
+
+void InlineWatchpointSet::add(Watchpoint* watchpoint)
+{
+    inflate()->add(watchpoint);
+}
+
+WatchpointSet* InlineWatchpointSet::inflateSlow()
+{
+    ASSERT(isThin());
+    WatchpointSet* fat = adoptRef(new WatchpointSet(InitializedBlind)).leakRef();
+    if (m_data & IsInvalidatedFlag)
+        fat->m_isInvalidated = true;
+    if (m_data & IsWatchedFlag)
+        fat->m_isWatched = true;
+    m_data = bitwise_cast<uintptr_t>(fat);
+    return fat;
+}
+
+void InlineWatchpointSet::freeFat()
+{
+    ASSERT(isFat());
+    fat()->deref();
+}
+
+} // namespace JSC
+