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// Copyright 2023 The Pigweed Authors
//
// 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
//
// https://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.
#include "pw_allocator/libc_allocator.h"
#include <algorithm>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include "pw_assert/check.h"
#include "pw_bytes/alignment.h"
namespace pw::allocator {
void* LibCAllocator::DoAllocate(Layout layout) {
// TODO: b/301930507 - `aligned_alloc` is not portable. Return null for larger
// allocations for now.
return layout.alignment() <= alignof(std::max_align_t)
? std::malloc(layout.size())
: nullptr;
}
void LibCAllocator::DoDeallocate(void* ptr, Layout) { std::free(ptr); }
bool LibCAllocator::DoResize(void*, Layout layout, size_t new_size) {
// `realloc` may move memory, even when shrinking. Only return true if no
// change is needed.
return layout.size() == new_size;
}
void* LibCAllocator::DoReallocate(void* ptr, Layout layout, size_t new_size) {
// TODO: b/301930507 - `aligned_alloc` is not portable. Return null for larger
// allocations for now.
return layout.alignment() <= alignof(std::max_align_t)
? std::realloc(ptr, new_size)
: nullptr;
}
} // namespace pw::allocator
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