/src/abseil-cpp/absl/base/internal/hide_ptr.h
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1 | | // Copyright 2018 The Abseil Authors. |
2 | | // |
3 | | // Licensed under the Apache License, Version 2.0 (the "License"); |
4 | | // you may not use this file except in compliance with the License. |
5 | | // You may obtain a copy of the License at |
6 | | // |
7 | | // https://www.apache.org/licenses/LICENSE-2.0 |
8 | | // |
9 | | // Unless required by applicable law or agreed to in writing, software |
10 | | // distributed under the License is distributed on an "AS IS" BASIS, |
11 | | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | | // See the License for the specific language governing permissions and |
13 | | // limitations under the License. |
14 | | |
15 | | #ifndef ABSL_BASE_INTERNAL_HIDE_PTR_H_ |
16 | | #define ABSL_BASE_INTERNAL_HIDE_PTR_H_ |
17 | | |
18 | | #include <cstdint> |
19 | | |
20 | | #include "absl/base/config.h" |
21 | | |
22 | | namespace absl { |
23 | | ABSL_NAMESPACE_BEGIN |
24 | | namespace base_internal { |
25 | | |
26 | | // Arbitrary value with high bits set. Xor'ing with it is unlikely |
27 | | // to map one valid pointer to another valid pointer. |
28 | 6.48M | constexpr uintptr_t HideMask() { |
29 | 6.48M | return (uintptr_t{0xF03A5F7BU} << (sizeof(uintptr_t) - 4) * 8) | 0xF03A5F7BU; |
30 | 6.48M | } |
31 | | |
32 | | // Hide a pointer from the leak checker. For internal use only. |
33 | | // Differs from absl::IgnoreLeak(ptr) in that absl::IgnoreLeak(ptr) causes ptr |
34 | | // and all objects reachable from ptr to be ignored by the leak checker. |
35 | | template <class T> |
36 | 6.48M | inline uintptr_t HidePtr(T* ptr) { |
37 | 6.48M | return reinterpret_cast<uintptr_t>(ptr) ^ HideMask(); |
38 | 6.48M | } Unexecuted instantiation: unsigned long absl::base_internal::HidePtr<std::__1::atomic<long> >(std::__1::atomic<long>*) Unexecuted instantiation: unsigned long absl::base_internal::HidePtr<void const>(void const*) unsigned long absl::base_internal::HidePtr<void>(void*) Line | Count | Source | 36 | 6.48M | inline uintptr_t HidePtr(T* ptr) { | 37 | 6.48M | return reinterpret_cast<uintptr_t>(ptr) ^ HideMask(); | 38 | 6.48M | } |
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39 | | |
40 | | // Return a pointer that has been hidden from the leak checker. |
41 | | // For internal use only. |
42 | | template <class T> |
43 | 0 | inline T* UnhidePtr(uintptr_t hidden) { |
44 | 0 | return reinterpret_cast<T*>(hidden ^ HideMask()); |
45 | 0 | } |
46 | | |
47 | | } // namespace base_internal |
48 | | ABSL_NAMESPACE_END |
49 | | } // namespace absl |
50 | | |
51 | | #endif // ABSL_BASE_INTERNAL_HIDE_PTR_H_ |