1 files changed, 127 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/bytecode/Watchpoint.cpp b/Source/JavaScriptCore/bytecode/Watchpoint.cpp
new file mode 100644
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+++ b/Source/JavaScriptCore/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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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"
+
+namespace JSC {
+
+Watchpoint::~Watchpoint()
+{
+    if (isOnList())
+        remove();
+}
+
+#if ENABLE(JIT)
+void Watchpoint::correctLabels(LinkBuffer& linkBuffer)
+{
+    MacroAssembler::Label label;
+    label.m_label.m_offset = m_source;
+    m_source = bitwise_cast<uintptr_t>(linkBuffer.locationOf(label).dataLocation());
+    label.m_label.m_offset = m_destination;
+    m_destination = bitwise_cast<uintptr_t>(linkBuffer.locationOf(label).dataLocation());
+}
+#endif
+
+void Watchpoint::fire()
+{
+#if ENABLE(JIT)
+    MacroAssembler::replaceWithJump(
+        CodeLocationLabel(bitwise_cast<void*>(m_source)),
+        CodeLocationLabel(bitwise_cast<void*>(m_destination)));
+    if (isOnList())
+        remove();
+#else
+    UNREACHABLE_FOR_PLATFORM();
+#endif
+}
+
+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
+