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authorLorry Tar Creator <lorry-tar-importer@lorry>2017-06-27 06:07:23 +0000
committerLorry Tar Creator <lorry-tar-importer@lorry>2017-06-27 06:07:23 +0000
commit1bf1084f2b10c3b47fd1a588d85d21ed0eb41d0c (patch)
tree46dcd36c86e7fbc6e5df36deb463b33e9967a6f7 /Source/JavaScriptCore/bytecode/VariableWatchpointSet.h
parent32761a6cee1d0dee366b885b7b9c777e67885688 (diff)
downloadWebKitGtk-tarball-master.tar.gz
Diffstat (limited to 'Source/JavaScriptCore/bytecode/VariableWatchpointSet.h')
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diff --git a/Source/JavaScriptCore/bytecode/VariableWatchpointSet.h b/Source/JavaScriptCore/bytecode/VariableWatchpointSet.h
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-/*
- * Copyright (C) 2012, 2013 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.
- */
-
-#ifndef VariableWatchpointSet_h
-#define VariableWatchpointSet_h
-
-#include "Watchpoint.h"
-#include "WriteBarrier.h"
-
-namespace JSC {
-
-class VariableWatchpointSet : public WatchpointSet {
- friend class LLIntOffsetsExtractor;
-public:
- VariableWatchpointSet()
- : WatchpointSet(ClearWatchpoint)
- {
- }
-
- ~VariableWatchpointSet() { }
-
- // For the purpose of deciding whether or not to watch this variable, you only need
- // to inspect inferredValue(). If this returns something other than the empty
- // value, then it means that at all future safepoints, this watchpoint set will be
- // in one of these states:
- //
- // IsWatched: in this case, the variable's value must still be the
- // inferredValue.
- //
- // IsInvalidated: in this case the variable's value may be anything but you'll
- // either notice that it's invalidated and not install the watchpoint, or
- // you will have been notified that the watchpoint was fired.
- JSValue inferredValue() const { return m_inferredValue; }
-
- void notifyWrite(JSValue value)
- {
- ASSERT(!!value);
- switch (state()) {
- case ClearWatchpoint:
- m_inferredValue = value;
- startWatching();
- return;
-
- case IsWatched:
- ASSERT(!!m_inferredValue);
- if (value == m_inferredValue)
- return;
- invalidate();
- return;
-
- case IsInvalidated:
- ASSERT(!m_inferredValue);
- return;
- }
-
- ASSERT_NOT_REACHED();
- }
-
- void invalidate()
- {
- m_inferredValue = JSValue();
- WatchpointSet::invalidate();
- }
-
- void finalizeUnconditionally()
- {
- ASSERT(!!m_inferredValue == (state() == IsWatched));
- if (!m_inferredValue)
- return;
- if (!m_inferredValue.isCell())
- return;
- JSCell* cell = m_inferredValue.asCell();
- if (Heap::isMarked(cell))
- return;
- invalidate();
- }
-
- JSValue* addressOfInferredValue() { return &m_inferredValue; }
-
-private:
- JSValue m_inferredValue;
-};
-
-} // namespace JSC
-
-#endif // VariableWatchpointSet_h
-