81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
//
|
|
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
//
|
|
#include "td/utils/StackAllocator.h"
|
|
|
|
#include "td/utils/port/thread_local.h"
|
|
|
|
#include <array>
|
|
#include <cstdlib>
|
|
|
|
namespace td {
|
|
namespace {
|
|
class ArrayAllocator final : public StackAllocator::AllocatorImpl {
|
|
static const size_t MEM_SIZE = 1024 * 1024;
|
|
std::array<char, MEM_SIZE> mem;
|
|
size_t pos{0};
|
|
|
|
MutableSlice allocate(size_t size) final {
|
|
if (size > MEM_SIZE) {
|
|
std::abort(); // too much memory requested
|
|
}
|
|
char *res = mem.data() + pos;
|
|
pos += (size + 7) & -8;
|
|
if (pos > MEM_SIZE) {
|
|
std::abort(); // memory is over
|
|
}
|
|
return {res, size};
|
|
}
|
|
|
|
void free_ptr(char *ptr, size_t size) final {
|
|
size = (size + 7) & -8;
|
|
if (size > pos || ptr != mem.data() + (pos - size)) {
|
|
std::abort(); // shouldn't happen
|
|
}
|
|
pos -= size;
|
|
}
|
|
|
|
public:
|
|
~ArrayAllocator() final {
|
|
if (pos != 0) {
|
|
std::abort(); // shouldn't happen
|
|
}
|
|
}
|
|
};
|
|
|
|
class NewAllocator final : public StackAllocator::AllocatorImpl {
|
|
MutableSlice allocate(size_t size) final {
|
|
return {new char[size], size};
|
|
}
|
|
|
|
void free_ptr(char *ptr, size_t size) final {
|
|
delete[] ptr;
|
|
}
|
|
|
|
public:
|
|
~NewAllocator() final = default;
|
|
};
|
|
} // namespace
|
|
|
|
StackAllocator::Ptr::~Ptr() {
|
|
if (!slice_.empty()) {
|
|
allocator_->free_ptr(slice_.data(), slice_.size());
|
|
}
|
|
}
|
|
|
|
StackAllocator::AllocatorImpl *StackAllocator::impl() {
|
|
if (get_thread_id() != 0) {
|
|
static TD_THREAD_LOCAL ArrayAllocator *array_allocator; // static zero-initialized
|
|
init_thread_local<ArrayAllocator>(array_allocator);
|
|
return array_allocator;
|
|
} else {
|
|
static NewAllocator new_allocator;
|
|
return &new_allocator;
|
|
}
|
|
}
|
|
|
|
} // namespace td
|