| /* |
| * Copyright (C) 2017-2018 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. |
| */ |
| |
| #pragma once |
| |
| #include <cstddef> |
| #include <memory> |
| #include <wtf/FastMalloc.h> |
| #include <wtf/Poisoned.h> |
| |
| namespace WTF { |
| |
| template<typename Poison, typename T, typename Enable = void> |
| class PoisonedUniquePtr : public Poisoned<Poison, T*> { |
| WTF_MAKE_FAST_ALLOCATED; |
| using Base = Poisoned<Poison, T*>; |
| public: |
| static constexpr bool isPoisonedUniquePtrType = true; |
| using ValueType = T; |
| |
| PoisonedUniquePtr() = default; |
| PoisonedUniquePtr(std::nullptr_t) : Base() { } |
| PoisonedUniquePtr(T* ptr) : Base(ptr) { } |
| PoisonedUniquePtr(PoisonedUniquePtr&& ptr) : Base(WTFMove(ptr)) { ptr.clearWithoutDestroy(); } |
| PoisonedUniquePtr(std::unique_ptr<T>&& unique) : PoisonedUniquePtr(unique.release()) { } |
| |
| template<typename U, typename = std::enable_if_t<std::is_base_of<T, U>::value>> |
| PoisonedUniquePtr(std::unique_ptr<U>&& unique) |
| : Base(unique.release()) |
| { } |
| |
| template<typename Other, typename = std::enable_if_t<Other::isPoisonedUniquePtrType && std::is_base_of<T, typename Other::ValueType>::value>> |
| PoisonedUniquePtr(Other&& ptr) |
| : Base(ptr.unpoisoned()) |
| { |
| ptr.clearWithoutDestroy(); |
| } |
| |
| PoisonedUniquePtr(const PoisonedUniquePtr&) = delete; |
| |
| ~PoisonedUniquePtr() { destroy(); } |
| |
| template<typename... Arguments> |
| static PoisonedUniquePtr create(Arguments&&... arguments) |
| { |
| return new T(std::forward<Arguments>(arguments)...); |
| } |
| |
| PoisonedUniquePtr& operator=(T* ptr) |
| { |
| if (LIKELY(this->unpoisoned() != ptr)) { |
| this->clear(); |
| this->Base::operator=(ptr); |
| } |
| return *this; |
| } |
| |
| PoisonedUniquePtr& operator=(std::unique_ptr<T>&& unique) |
| { |
| this->clear(); |
| this->Base::operator=(unique.release()); |
| return *this; |
| } |
| |
| template<typename U, typename = std::enable_if_t<std::is_base_of<T, U>::value>> |
| PoisonedUniquePtr& operator=(std::unique_ptr<U>&& unique) |
| { |
| this->clear(); |
| this->Base::operator=(unique.release()); |
| return *this; |
| } |
| |
| template<typename Other, typename = std::enable_if_t<Other::isPoisonedUniquePtrType && std::is_base_of<T, typename Other::ValueType>::value>> |
| PoisonedUniquePtr& operator=(Other&& ptr) |
| { |
| ASSERT(this == static_cast<void*>(&ptr) || this->unpoisoned() != ptr.unpoisoned()); |
| if (LIKELY(this != static_cast<void*>(&ptr))) { |
| this->clear(); |
| this->Base::operator=(WTFMove(ptr)); |
| ptr.clearWithoutDestroy(); |
| } |
| return *this; |
| } |
| |
| PoisonedUniquePtr& operator=(const PoisonedUniquePtr&) = delete; |
| |
| T* get() const { return this->unpoisoned(); } |
| T& operator[](size_t index) const { return this->unpoisoned()[index]; } |
| |
| void clear() |
| { |
| destroy(); |
| clearWithoutDestroy(); |
| } |
| |
| private: |
| void destroy() |
| { |
| if (!this->bits()) |
| return; |
| delete this->unpoisoned(); |
| } |
| |
| void clearWithoutDestroy() { Base::clear(); } |
| |
| template<typename, typename, typename> friend class PoisonedUniquePtr; |
| }; |
| |
| template<typename Poison, typename T> |
| class PoisonedUniquePtr<Poison, T[]> : public Poisoned<Poison, T*> { |
| WTF_MAKE_FAST_ALLOCATED; |
| using Base = Poisoned<Poison, T*>; |
| public: |
| static constexpr bool isPoisonedUniquePtrType = true; |
| using ValueType = T[]; |
| |
| PoisonedUniquePtr() = default; |
| PoisonedUniquePtr(std::nullptr_t) : Base() { } |
| PoisonedUniquePtr(T* ptr) : Base(ptr) { } |
| PoisonedUniquePtr(PoisonedUniquePtr&& ptr) : Base(WTFMove(ptr)) { ptr.clearWithoutDestroy(); } |
| PoisonedUniquePtr(std::unique_ptr<T[]>&& unique) : PoisonedUniquePtr(unique.release()) { } |
| |
| template<typename Other, typename = std::enable_if_t<Other::isPoisonedUniquePtrType && std::is_same<T[], typename Other::ValueType>::value>> |
| PoisonedUniquePtr(Other&& ptr) |
| : Base(ptr.unpoisoned()) |
| { |
| ptr.clearWithoutDestroy(); |
| } |
| |
| PoisonedUniquePtr(const PoisonedUniquePtr&) = delete; |
| |
| ~PoisonedUniquePtr() { destroy(); } |
| |
| template<typename... Arguments> |
| static PoisonedUniquePtr create(size_t count, Arguments&&... arguments) |
| { |
| T* result = new T[count]; |
| while (count--) |
| new (result + count) T(std::forward<Arguments>(arguments)...); |
| return result; |
| } |
| |
| PoisonedUniquePtr& operator=(T* ptr) |
| { |
| if (LIKELY(this->unpoisoned() != ptr)) { |
| this->clear(); |
| this->Base::operator=(ptr); |
| } |
| return *this; |
| } |
| |
| PoisonedUniquePtr& operator=(std::unique_ptr<T[]>&& unique) |
| { |
| this->clear(); |
| this->Base::operator=(unique.release()); |
| return *this; |
| } |
| |
| template<typename Other, typename = std::enable_if_t<Other::isPoisonedUniquePtrType && std::is_same<T[], typename Other::ValueType>::value>> |
| PoisonedUniquePtr& operator=(Other&& ptr) |
| { |
| ASSERT(this == static_cast<void*>(&ptr) || this->unpoisoned() != ptr.unpoisoned()); |
| if (LIKELY(this != static_cast<void*>(&ptr))) { |
| this->clear(); |
| this->Base::operator=(WTFMove(ptr)); |
| ptr.clearWithoutDestroy(); |
| } |
| return *this; |
| } |
| |
| PoisonedUniquePtr& operator=(const PoisonedUniquePtr&) = delete; |
| |
| T* get() const { return this->unpoisoned(); } |
| T& operator[](size_t index) const { return this->unpoisoned()[index]; } |
| |
| void clear() |
| { |
| destroy(); |
| clearWithoutDestroy(); |
| } |
| |
| private: |
| void destroy() |
| { |
| if (!this->bits()) |
| return; |
| delete[] this->unpoisoned(); |
| } |
| |
| void clearWithoutDestroy() { Base::clear(); } |
| |
| template<typename, typename, typename> friend class PoisonedUniquePtr; |
| }; |
| |
| } // namespace WTF |
| |
| using WTF::PoisonedUniquePtr; |
| |