JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / bytecode / VariableWatchpointSet.h

diff --git a/bytecode/VariableWatchpointSet.h b/bytecode/VariableWatchpointSet.h
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--- a/bytecode/VariableWatchpointSet.h
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-/*
- * Copyright (C) 2012-2014 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 SymbolTable;
-
-class VariableWatchpointSet : public WatchpointSet {
-    friend class LLIntOffsetsExtractor;
-public:
-    VariableWatchpointSet(SymbolTable& symbolTable)
-        : WatchpointSet(ClearWatchpoint)
-        , m_symbolTable(symbolTable)
-    {
-    }
-    
-    ~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.get(); }
-    
-    inline void notifyWrite(VM&, JSValue);
-    
-    void invalidate()
-    {
-        m_inferredValue.clear();
-        WatchpointSet::invalidate();
-    }
-    
-    void finalizeUnconditionally()
-    {
-        ASSERT(!!m_inferredValue == (state() == IsWatched));
-        if (!m_inferredValue)
-            return;
-        JSValue inferredValue = m_inferredValue.get();
-        if (!inferredValue.isCell())
-            return;
-        JSCell* cell = inferredValue.asCell();
-        if (Heap::isMarked(cell))
-            return;
-        invalidate();
-    }
-
-    WriteBarrier<Unknown>* addressOfInferredValue() { return &m_inferredValue; }
-    
-private:
-    SymbolTable& m_symbolTable;
-    WriteBarrier<Unknown> m_inferredValue;
-};
-
-} // namespace JSC
-
-#endif // VariableWatchpointSet_h
-