JavaScriptCore-7600.1.4.9.tar.gz

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

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+/*
+ * Copyright (C) 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. 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 INC. 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.
+ */
+
+#ifndef FullBytecodeLiveness_h
+#define FullBytecodeLiveness_h
+
+#include <wtf/FastBitVector.h>
+
+namespace JSC {
+
+class BytecodeLivenessAnalysis;
+
+typedef HashMap<unsigned, FastBitVector, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned>> BytecodeToBitmapMap;
+
+class FullBytecodeLiveness {
+public:
+    FullBytecodeLiveness() : m_codeBlock(0) { }
+    
+    // We say "out" to refer to the bitvector that contains raw results for a bytecode
+    // instruction.
+    const FastBitVector& getOut(unsigned bytecodeIndex) const
+    {
+        BytecodeToBitmapMap::const_iterator iter = m_map.find(bytecodeIndex);
+        ASSERT(iter != m_map.end());
+        return iter->value;
+    }
+    
+    bool operandIsLive(int operand, unsigned bytecodeIndex) const
+    {
+        return operandIsAlwaysLive(m_codeBlock, operand) || operandThatIsNotAlwaysLiveIsLive(m_codeBlock, getOut(bytecodeIndex), operand);
+    }
+    
+    FastBitVector getLiveness(unsigned bytecodeIndex) const
+    {
+        return getLivenessInfo(m_codeBlock, getOut(bytecodeIndex));
+    }
+    
+private:
+    friend class BytecodeLivenessAnalysis;
+    
+    CodeBlock* m_codeBlock;
+    BytecodeToBitmapMap m_map;
+};
+
+} // namespace JSC
+
+#endif // FullBytecodeLiveness_h
+