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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/allocator_metric_proxy.h"
#include <cstddef>
#include "pw_assert/check.h"
#include "pw_metric/metric.h"
namespace pw::allocator {
void AllocatorMetricProxy::Initialize(Allocator& allocator) {
PW_DCHECK(allocator_ == nullptr);
allocator_ = &allocator;
// Manually add the metrics to the metric group to allow the constructor to
// remain constexpr.
memusage_.Add(used_);
memusage_.Add(peak_);
memusage_.Add(count_);
}
Status AllocatorMetricProxy::DoQuery(const void* ptr, Layout layout) const {
PW_DCHECK_NOTNULL(allocator_);
return allocator_->Query(ptr, layout);
}
void* AllocatorMetricProxy::DoAllocate(Layout layout) {
PW_DCHECK_NOTNULL(allocator_);
void* ptr = allocator_->Allocate(layout);
if (ptr == nullptr) {
return nullptr;
}
used_.Increment(layout.size());
if (used_.value() > peak_.value()) {
peak_.Set(used_.value());
}
count_.Increment();
return ptr;
}
void AllocatorMetricProxy::DoDeallocate(void* ptr, Layout layout) {
PW_DCHECK_NOTNULL(allocator_);
allocator_->Deallocate(ptr, layout);
if (ptr == nullptr) {
return;
}
PW_DCHECK_UINT_GE(used_.value(), layout.size());
PW_DCHECK_UINT_NE(count_.value(), 0);
used_.Set(used_.value() - layout.size());
count_.Set(count_.value() - 1);
}
bool AllocatorMetricProxy::DoResize(void* ptr, Layout layout, size_t new_size) {
PW_DCHECK_NOTNULL(allocator_);
if (!allocator_->Resize(ptr, layout, new_size)) {
return false;
}
PW_DCHECK_UINT_GE(used_.value(), layout.size());
used_.Set(used_.value() - layout.size() + new_size);
if (used_.value() > peak_.value()) {
peak_.Set(used_.value());
}
return true;
}
} // namespace pw::allocator
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