1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <wtf/CagedPtr.h>
29
30namespace WTF {
31
32template<Gigacage::Kind kind, typename T, bool shouldTag = false>
33class CagedUniquePtr : public CagedPtr<kind, T, shouldTag> {
34 static_assert(std::is_trivially_destructible<T>::value, "We expect the contents of a caged pointer to be trivially destructable.");
35public:
36 using Base = CagedPtr<kind, T, shouldTag>;
37 CagedUniquePtr() = default;
38
39 CagedUniquePtr(T* ptr, unsigned size)
40 : Base(ptr, size)
41 { }
42
43 CagedUniquePtr(CagedUniquePtr&& ptr)
44 : Base(std::forward<CagedUniquePtr&&>(ptr))
45 { }
46
47 CagedUniquePtr(const CagedUniquePtr&) = delete;
48
49 template<typename... Arguments>
50 static CagedUniquePtr create(unsigned length, Arguments&&... arguments)
51 {
52 T* result = static_cast<T*>(Gigacage::malloc(kind, sizeof(T) * length));
53 while (length--)
54 new (result + length) T(arguments...);
55 return CagedUniquePtr(result, length);
56 }
57
58 CagedUniquePtr& operator=(CagedUniquePtr&& ptr)
59 {
60 destroy();
61 this->m_ptr = ptr.m_ptr;
62 ptr.m_ptr = nullptr;
63 return *this;
64 }
65
66 CagedUniquePtr& operator=(const CagedUniquePtr&) = delete;
67
68 ~CagedUniquePtr()
69 {
70 destroy();
71 }
72
73private:
74 void destroy()
75 {
76 T* ptr = Base::getUnsafe();
77 if (!ptr)
78 return;
79 ptr->~T();
80 Gigacage::free(kind, ptr);
81 }
82};
83
84} // namespace WTF
85
86using WTF::CagedUniquePtr;
87
88