Optimize functions on a second thread.

src/smart-array-pointer.h

-// 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,
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-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_SMART_ARRAY_POINTER_H_
-#define V8_SMART_ARRAY_POINTER_H_
-
-namespace v8 {
-namespace internal {
-
-
-// A 'scoped array pointer' that calls DeleteArray on its pointer when the
-// destructor is called.
-template<typename T>
-class SmartArrayPointer {
- public:
-  // Default constructor. Constructs an empty scoped pointer.
-  inline SmartArrayPointer() : p_(NULL) {}
-
-  // Constructs a scoped pointer from a plain one.
-  explicit inline SmartArrayPointer(T* ptr) : p_(ptr) {}
-
-  // Copy constructor removes the pointer from the original to avoid double
-  // freeing.
-  inline SmartArrayPointer(const SmartArrayPointer<T>& rhs) : p_(rhs.p_) {
-    const_cast<SmartArrayPointer<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 ~SmartArrayPointer() { if (p_) DeleteArray(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 SmartArrayPointer& operator=(const SmartArrayPointer<T>& rhs) {
-    ASSERT(is_empty());
-    T* tmp = rhs.p_;  // swap to handle self-assignment
-    const_cast<SmartArrayPointer<T>&>(rhs).p_ = NULL;
-    p_ = tmp;
-    return *this;
-  }
-
-  inline bool is_empty() { return p_ == NULL; }
-
- private:
-  T* p_;
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_SMART_ARRAY_POINTER_H_