JavaScriptCore-7600.1.4.9.tar.gz

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

diff --git a/bytecode/BytecodeBasicBlock.h b/bytecode/BytecodeBasicBlock.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 BytecodeBasicBlock_h
+#define BytecodeBasicBlock_h
+
+#include <limits.h>
+#include <wtf/FastBitVector.h>
+#include <wtf/HashMap.h>
+#include <wtf/RefCounted.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class CodeBlock;
+
+class BytecodeBasicBlock : public RefCounted<BytecodeBasicBlock> {
+public:
+    enum SpecialBlockType { EntryBlock, ExitBlock };
+    BytecodeBasicBlock(unsigned start, unsigned length);
+    BytecodeBasicBlock(SpecialBlockType);
+
+    bool isEntryBlock() { return !m_leaderBytecodeOffset && !m_totalBytecodeLength; }
+    bool isExitBlock() { return m_leaderBytecodeOffset == UINT_MAX && m_totalBytecodeLength == UINT_MAX; }
+
+    unsigned leaderBytecodeOffset() { return m_leaderBytecodeOffset; }
+    unsigned totalBytecodeLength() { return m_totalBytecodeLength; }
+
+    Vector<unsigned>& bytecodeOffsets() { return m_bytecodeOffsets; }
+    void addBytecodeLength(unsigned);
+
+    void addPredecessor(BytecodeBasicBlock* block) { m_predecessors.append(block); }
+    void addSuccessor(BytecodeBasicBlock* block) { m_successors.append(block); }
+
+    Vector<BytecodeBasicBlock*>& predecessors() { return m_predecessors; }
+    Vector<BytecodeBasicBlock*>& successors() { return m_successors; }
+
+    FastBitVector& in() { return m_in; }
+    FastBitVector& out() { return m_out; }
+
+private:
+    unsigned m_leaderBytecodeOffset;
+    unsigned m_totalBytecodeLength;
+
+    Vector<unsigned> m_bytecodeOffsets;
+
+    Vector<BytecodeBasicBlock*> m_predecessors;
+    Vector<BytecodeBasicBlock*> m_successors;
+
+    FastBitVector m_in;
+    FastBitVector m_out;
+};
+
+void computeBytecodeBasicBlocks(CodeBlock*, Vector<RefPtr<BytecodeBasicBlock> >&);
+
+inline BytecodeBasicBlock::BytecodeBasicBlock(unsigned start, unsigned length)
+    : m_leaderBytecodeOffset(start)
+    , m_totalBytecodeLength(length)
+{
+    m_bytecodeOffsets.append(m_leaderBytecodeOffset);
+}
+
+inline BytecodeBasicBlock::BytecodeBasicBlock(BytecodeBasicBlock::SpecialBlockType blockType)
+    : m_leaderBytecodeOffset(blockType == BytecodeBasicBlock::EntryBlock ? 0 : UINT_MAX)
+    , m_totalBytecodeLength(blockType == BytecodeBasicBlock::EntryBlock ? 0 : UINT_MAX)
+{
+}
+
+inline void BytecodeBasicBlock::addBytecodeLength(unsigned bytecodeLength)
+{
+    m_bytecodeOffsets.append(m_leaderBytecodeOffset + m_totalBytecodeLength);
+    m_totalBytecodeLength += bytecodeLength;
+}
+
+} // namespace JSC
+
+#endif // BytecodeBasicBlock_h