JavaScriptCore-1097.3.tar.gz

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

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+/*
+ * Copyright (C) 2012 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 DFGInsertionSet_h
+#define DFGInsectionSet_h
+
+#include <wtf/Platform.h>
+
+#if ENABLE(DFG_JIT)
+
+#include <wtf/Vector.h>
+
+namespace JSC { namespace DFG {
+
+template<typename ElementType>
+class Insertion {
+public:
+    Insertion() { }
+    
+    Insertion(size_t index, const ElementType& element)
+        : m_index(index)
+        , m_element(element)
+    {
+    }
+    
+    size_t index() const { return m_index; }
+    const ElementType& element() const { return m_element; }
+private:
+    size_t m_index;
+    ElementType m_element;
+};
+
+template<typename ElementType>
+class InsertionSet {
+public:
+    InsertionSet() { }
+    
+    void append(const Insertion<ElementType>& insertion)
+    {
+        ASSERT(!m_insertions.size() || m_insertions.last().index() <= insertion.index());
+        m_insertions.append(insertion);
+    }
+    
+    void append(size_t index, const ElementType& element)
+    {
+        append(Insertion<ElementType>(index, element));
+    }
+    
+    template<typename CollectionType>
+    void execute(CollectionType& collection)
+    {
+        if (!m_insertions.size())
+            return;
+        collection.grow(collection.size() + m_insertions.size());
+        size_t lastIndex = collection.size();
+        for (size_t indexInInsertions = m_insertions.size(); indexInInsertions--;) {
+            Insertion<ElementType>& insertion = m_insertions[indexInInsertions];
+            size_t firstIndex = insertion.index() + indexInInsertions;
+            size_t indexOffset = indexInInsertions + 1;
+            for (size_t i = lastIndex; i-- > firstIndex;)
+                collection[i] = collection[i - indexOffset];
+            collection[firstIndex] = insertion.element();
+            lastIndex = firstIndex;
+        }
+        m_insertions.resize(0);
+    }
+private:
+    Vector<Insertion<ElementType>, 8> m_insertions;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGInsertionSet_h
+