JavaScriptCore-1097.3.tar.gz

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

diff --git a/dfg/DFGAdjacencyList.h b/dfg/DFGAdjacencyList.h
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+/*
+ * Copyright (C) 2011 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 DFGAdjacencyList_h
+#define DFGAdjacencyList_h
+
+#include <wtf/Platform.h>
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGCommon.h"
+#include "DFGEdge.h"
+
+namespace JSC { namespace DFG {
+
+class AdjacencyList {
+public:
+    enum Kind {
+        Fixed,
+        Variable
+    };
+
+    AdjacencyList(Kind kind)
+#if !ASSERT_DISABLED
+        : m_kind(kind)
+#endif
+    {
+        if (kind == Variable) {
+            m_words[0].m_encodedWord = UINT_MAX;
+            m_words[1].m_encodedWord = UINT_MAX;
+        }
+    }
+    
+    AdjacencyList(Kind kind, NodeIndex child1, NodeIndex child2, NodeIndex child3)
+#if !ASSERT_DISABLED
+        : m_kind(Fixed)
+#endif
+    {
+        ASSERT_UNUSED(kind, kind == Fixed);
+        initialize(child1, child2, child3);
+    }
+    
+    AdjacencyList(Kind kind, unsigned firstChild, unsigned numChildren)
+#if !ASSERT_DISABLED
+        : m_kind(Variable)
+#endif
+    {
+        ASSERT_UNUSED(kind, kind == Variable);
+        setFirstChild(firstChild);
+        setNumChildren(numChildren);
+    }
+    
+    const Edge& child(unsigned i) const
+    {
+        ASSERT(i < 3);
+        ASSERT(m_kind == Fixed);
+        return m_words[i];
+    }    
+    
+    Edge& child(unsigned i)
+    {
+        ASSERT(i < 3);
+        ASSERT(m_kind == Fixed);
+        return m_words[i];
+    }
+    
+    void setChild(unsigned i, Edge nodeUse)
+    {
+        ASSERT(i < 30);
+        ASSERT(m_kind == Fixed);
+        m_words[i] = nodeUse;
+    }
+    
+    Edge child1() const { return child(0); }
+    Edge child2() const { return child(1); }
+    Edge child3() const { return child(2); }
+
+    Edge& child1() { return child(0); }
+    Edge& child2() { return child(1); }
+    Edge& child3() { return child(2); }
+    
+    void setChild1(Edge nodeUse) { setChild(0, nodeUse); }
+    void setChild2(Edge nodeUse) { setChild(1, nodeUse); }
+    void setChild3(Edge nodeUse) { setChild(2, nodeUse); }
+    
+    Edge child1Unchecked() const { return m_words[0]; }
+    
+    void initialize(Edge child1, Edge child2, Edge child3)
+    {
+        child(0) = child1;
+        child(1) = child2;
+        child(2) = child3;
+    }
+    
+    void initialize(NodeIndex child1, NodeIndex child2, NodeIndex child3)
+    {
+        initialize(Edge(child1), Edge(child2), Edge(child3));
+    }
+
+    unsigned firstChild() const
+    {
+        ASSERT(m_kind == Variable);
+        return m_words[0].m_encodedWord;
+    }
+    void setFirstChild(unsigned firstChild)
+    {
+        ASSERT(m_kind == Variable);
+        m_words[0].m_encodedWord = firstChild;
+    }
+    
+    unsigned numChildren() const
+    {
+        ASSERT(m_kind == Variable);
+        return m_words[1].m_encodedWord;
+    }
+    void setNumChildren(unsigned numChildren)
+    {
+        ASSERT(m_kind == Variable);
+        m_words[1].m_encodedWord = numChildren;
+    }
+    
+private:
+    Edge m_words[3];
+#if !ASSERT_DISABLED
+    Kind m_kind;
+#endif
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGAdjacencyList_h