JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / dfg / DFGNaiveDominators.h

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+/*
+ * Copyright (C) 2011, 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 DFGNaiveDominators_h
+#define DFGNaiveDominators_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGBasicBlock.h"
+#include "DFGCommon.h"
+#include <wtf/FastBitVector.h>
+
+namespace JSC { namespace DFG {
+
+class Graph;
+
+// This class is only used for validating the real dominators implementation.
+
+class NaiveDominators {
+public:
+    NaiveDominators();
+    ~NaiveDominators();
+    
+    void compute(Graph&);
+    
+    bool dominates(BlockIndex from, BlockIndex to) const
+    {
+        return m_results[to].get(from);
+    }
+    
+    bool dominates(BasicBlock* from, BasicBlock* to) const
+    {
+        return dominates(from->index, to->index);
+    }
+    
+    void dump(Graph&, PrintStream&) const;
+    
+private:
+    bool pruneDominators(Graph&, BlockIndex);
+    
+    Vector<FastBitVector> m_results; // For each block, the bitvector of blocks that dominate it.
+    FastBitVector m_scratch; // A temporary bitvector with bit for each block. We recycle this to save new/deletes.
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGNaiveDominators_h