/*
|
* Copyright (C) 2019 The Android Open Source Project
|
*
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
* you may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at
|
*
|
* http://www.apache.org/licenses/LICENSE-2.0
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*/
|
|
#ifndef SRC_PROFILING_MEMORY_UNHOOKED_ALLOCATOR_H_
|
#define SRC_PROFILING_MEMORY_UNHOOKED_ALLOCATOR_H_
|
|
#include <stdlib.h>
|
|
#include <atomic>
|
#include <exception>
|
|
namespace perfetto {
|
namespace profiling {
|
|
// An allocator that uses the given |malloc| & |free| function pointers to
|
// allocate/deallocate memory. Used in the heapprofd_client library, which hooks
|
// the malloc functions in a target process, and therefore needs to use this
|
// allocator to not have its own heap usage enter the hooks.
|
//
|
// See https://en.cppreference.com/w/cpp/named_req/Allocator.
|
template <typename T>
|
class UnhookedAllocator {
|
public:
|
template <typename U>
|
friend class UnhookedAllocator;
|
|
// to satisfy the Allocator interface
|
using value_type = T;
|
|
// for implementation convenience
|
using unhooked_malloc_t = void* (*)(size_t);
|
using unhooked_free_t = void (*)(void*);
|
|
UnhookedAllocator(unhooked_malloc_t unhooked_malloc,
|
unhooked_free_t unhooked_free)
|
: unhooked_malloc_(unhooked_malloc), unhooked_free_(unhooked_free) {}
|
|
template <typename U>
|
constexpr UnhookedAllocator(const UnhookedAllocator<U>& other) noexcept
|
: unhooked_malloc_(other.unhooked_malloc_),
|
unhooked_free_(other.unhooked_free_) {}
|
|
T* allocate(size_t n) {
|
if (n > size_t(-1) / sizeof(T))
|
std::terminate();
|
if (T* p = static_cast<T*>(unhooked_malloc_(n * sizeof(T))))
|
return p;
|
std::terminate();
|
}
|
|
void deallocate(T* p, size_t) noexcept { unhooked_free_(p); }
|
|
private:
|
unhooked_malloc_t unhooked_malloc_ = nullptr;
|
unhooked_free_t unhooked_free_ = nullptr;
|
};
|
|
template <typename T, typename U>
|
bool operator==(const UnhookedAllocator<T>& first,
|
const UnhookedAllocator<U>& second) {
|
return first.unhooked_malloc_ == second.unhooked_malloc_ &&
|
first.unhooked_free_ == second.unhooked_free_;
|
}
|
|
template <typename T, typename U>
|
bool operator!=(const UnhookedAllocator<T>& first,
|
const UnhookedAllocator<U>& second) {
|
return !(first == second);
|
}
|
|
} // namespace profiling
|
} // namespace perfetto
|
|
#endif // SRC_PROFILING_MEMORY_UNHOOKED_ALLOCATOR_H_
|
