1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (c) 2022 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 <cstdint>
#include <utility>
#include <wtf/PtrTag.h>
#include <wtf/StdLibExtras.h>
namespace WTF {
template<typename T, const uintptr_t Tag>
class SignedPtr {
public:
WTF_MAKE_FAST_ALLOCATED;
public:
constexpr SignedPtr()
: m_value(nullptr)
{
}
constexpr SignedPtr(std::nullptr_t)
: m_value(nullptr)
{
}
SignedPtr(T* value)
{
set(value);
}
T* get() const
{
#if CPU(ARM64E)
if (!m_value)
return nullptr;
return ptrauth_auth_data(m_value, ptrauth_key_process_dependent_data, Tag);
#else
return m_value;
#endif
}
void set(T* passedValue)
{
#if CPU(ARM64E)
if (!passedValue)
return;
m_value = ptrauth_sign_unauthenticated(passedValue, ptrauth_key_process_dependent_data, Tag);
#else
m_value = passedValue;
#endif
}
void clear()
{
set(nullptr);
}
T* operator->() const { return get(); }
template <typename U = T>
typename std::enable_if<!std::is_void_v<U>, U&>::type operator*() const { return *get(); }
bool operator!() const { return !m_value; }
// This conversion operator allows implicit conversion to bool but not to other integer types.
typedef T* (SignedPtr::*UnspecifiedBoolType);
operator UnspecifiedBoolType() const { return get() ? &SignedPtr::m_value : nullptr; }
explicit operator bool() const { return get(); }
SignedPtr& operator=(T* value)
{
set(value);
return *this;
}
template<class U>
T* exchange(U&& newValue)
{
T* oldValue = get();
set(std::forward<U>(newValue));
return oldValue;
}
void swap(std::nullptr_t) { clear(); }
void swap(SignedPtr& other)
{
T* t1 = get();
T* t2 = other.get();
set(t2);
other.set(t1);
}
private:
T* m_value;
};
template <typename T, uintptr_t Tag>
struct IsSmartPtr<SignedPtr<T, Tag>> {
static constexpr bool value = true;
static constexpr bool isNullable = true;
};
template<typename T, uintptr_t Tag>
struct SignedPtrTraits {
template<typename U, uintptr_t V> using RebindTraits = SignedPtrTraits<U, V>;
using StorageType = SignedPtr<T, Tag>;
template<class U> static ALWAYS_INLINE T* exchange(StorageType& ptr, U&& newValue) { return ptr.exchange(newValue); }
template<typename Other> static ALWAYS_INLINE void swap(StorageType& a, Other& b) { a.swap(b); }
static ALWAYS_INLINE T* unwrap(const StorageType& ptr) { return ptr.get(); }
static StorageType hashTableDeletedValue() { return std::bit_cast<StorageType>(static_cast<uintptr_t>(-1)); }
static ALWAYS_INLINE bool isHashTableDeletedValue(const StorageType& ptr) { return ptr == hashTableDeletedValue(); }
};
} // namespace WTF
using WTF::SignedPtrTraits;
|
