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+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * 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.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+// OWNER 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 V8_SMART_POINTERS_H_
+#define V8_SMART_POINTERS_H_
+
+namespace v8 {
+namespace internal {
+
+
+template<typename Deallocator, typename T>
+class SmartPointerBase {
+ public:
+  // Default constructor. Constructs an empty scoped pointer.
+  inline SmartPointerBase() : p_(NULL) {}
+
+  // Constructs a scoped pointer from a plain one.
+  explicit inline SmartPointerBase(T* ptr) : p_(ptr) {}
+
+  // Copy constructor removes the pointer from the original to avoid double
+  // freeing.
+  inline SmartPointerBase(const SmartPointerBase<Deallocator, T>& rhs)
+      : p_(rhs.p_) {
+    const_cast<SmartPointerBase<Deallocator, T>&>(rhs).p_ = NULL;
+  }
+
+  // When the destructor of the scoped pointer is executed the plain pointer
+  // is deleted using DeleteArray.  This implies that you must allocate with
+  // NewArray.
+  inline ~SmartPointerBase() { if (p_) Deallocator::Delete(p_); }
+
+  inline T* operator->() const { return p_; }
+
+  // You can get the underlying pointer out with the * operator.
+  inline T* operator*() { return p_; }
+
+  // You can use [n] to index as if it was a plain pointer
+  inline T& operator[](size_t i) {
+    return p_[i];
+  }
+
+  // We don't have implicit conversion to a T* since that hinders migration:
+  // You would not be able to change a method from returning a T* to
+  // returning an SmartArrayPointer<T> and then get errors wherever it is used.
+
+
+  // If you want to take out the plain pointer and don't want it automatically
+  // deleted then call Detach().  Afterwards, the smart pointer is empty
+  // (NULL).
+  inline T* Detach() {
+    T* temp = p_;
+    p_ = NULL;
+    return temp;
+  }
+
+  // Assignment requires an empty (NULL) SmartArrayPointer as the receiver. Like
+  // the copy constructor it removes the pointer in the original to avoid
+  // double freeing.
+  inline SmartPointerBase<Deallocator, T>& operator=(
+      const SmartPointerBase<Deallocator, T>& rhs) {
+    ASSERT(is_empty());
+    T* tmp = rhs.p_;  // swap to handle self-assignment
+    const_cast<SmartPointerBase<Deallocator, T>&>(rhs).p_ = NULL;
+    p_ = tmp;
+    return *this;
+  }
+
+  inline bool is_empty() { return p_ == NULL; }
+
+ private:
+  T* p_;
+};
+
+// A 'scoped array pointer' that calls DeleteArray on its pointer when the
+// destructor is called.
+
+template<typename T>
+struct ArrayDeallocator {
+  static void Delete(T* array) {
+    DeleteArray(array);
+  }
+};
+
+
+template<typename T>
+class SmartArrayPointer: public SmartPointerBase<ArrayDeallocator<T>, T> {
+ public:
+  inline SmartArrayPointer() { }
+  explicit inline SmartArrayPointer(T* ptr)
+      : SmartPointerBase<ArrayDeallocator<T>, T>(ptr) { }
+  inline SmartArrayPointer(const SmartArrayPointer<T>& rhs)
+      : SmartPointerBase<ArrayDeallocator<T>, T>(rhs) { }
+};
+
+
+template<typename T>
+struct ObjectDeallocator {
+  static void Delete(T* array) {
+    Malloced::Delete(array);
+  }
+};
+
+template<typename T>
+class SmartPointer: public SmartPointerBase<ObjectDeallocator<T>, T> {
+ public:
+  inline SmartPointer() { }
+  explicit inline SmartPointer(T* ptr)
+      : SmartPointerBase<ObjectDeallocator<T>, T>(ptr) { }
+  inline SmartPointer(const SmartPointer<T>& rhs)
+      : SmartPointerBase<ObjectDeallocator<T>, T>(rhs) { }
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_SMART_POINTERS_H_