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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/zone/accounting-allocator.h"
#include <cstdlib>
#if V8_LIBC_BIONIC
#include <malloc.h> // NOLINT
#endif
#include "src/allocation.h"
#include "src/asan.h"
#include "src/msan.h"
namespace v8 {
namespace internal {
AccountingAllocator::~AccountingAllocator() = default;
Segment* AccountingAllocator::AllocateSegment(size_t bytes) {
void* memory = AllocWithRetry(bytes);
if (memory == nullptr) return nullptr;
size_t current =
current_memory_usage_.fetch_add(bytes, std::memory_order_relaxed) + bytes;
size_t max = max_memory_usage_.load(std::memory_order_relaxed);
while (current > max && !max_memory_usage_.compare_exchange_weak(
max, current, std::memory_order_relaxed)) {
// {max} was updated by {compare_exchange_weak}; retry.
}
DCHECK_LE(sizeof(Segment), bytes);
return new (memory) Segment(bytes);
}
void AccountingAllocator::ReturnSegment(Segment* segment) {
segment->ZapContents();
current_memory_usage_.fetch_sub(segment->total_size(),
std::memory_order_relaxed);
segment->ZapHeader();
free(segment);
}
} // namespace internal
} // namespace v8
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