JavaScriptCore-7600.1.4.9.tar.gz

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

diff --git a/bytecode/BytecodeLivenessAnalysis.h b/bytecode/BytecodeLivenessAnalysis.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 BytecodeLivenessAnalysis_h
+#define BytecodeLivenessAnalysis_h
+
+#include "BytecodeBasicBlock.h"
+#include <wtf/FastBitVector.h>
+#include <wtf/HashMap.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class CodeBlock;
+class FullBytecodeLiveness;
+
+class BytecodeLivenessAnalysis {
+public:
+    BytecodeLivenessAnalysis(CodeBlock*);
+    
+    bool operandIsLiveAtBytecodeOffset(int operand, unsigned bytecodeOffset);
+    FastBitVector getLivenessInfoAtBytecodeOffset(unsigned bytecodeOffset);
+    
+    void computeFullLiveness(FullBytecodeLiveness& result);
+
+private:
+    void compute();
+    void runLivenessFixpoint();
+    void dumpResults();
+
+    void getLivenessInfoForNonCapturedVarsAtBytecodeOffset(unsigned bytecodeOffset, FastBitVector&);
+
+    CodeBlock* m_codeBlock;
+    Vector<RefPtr<BytecodeBasicBlock> > m_basicBlocks;
+};
+
+inline bool operandIsAlwaysLive(CodeBlock*, int operand);
+inline bool operandThatIsNotAlwaysLiveIsLive(CodeBlock*, const FastBitVector& out, int operand);
+inline bool operandIsLive(CodeBlock*, const FastBitVector& out, int operand);
+
+FastBitVector getLivenessInfo(CodeBlock*, const FastBitVector& out);
+
+} // namespace JSC
+
+#endif // BytecodeLivenessAnalysis_h