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/*
* Copyright 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.
*/
#pragma once
#include <android-base/stringprintf.h>
#include <utils/Trace.h>
#include <cmath>
#include <string>
template <typename T>
class TracedOrdinal {
public:
static_assert(std::is_same<bool, T>() || (std::is_signed<T>() && std::is_integral<T>()),
"Type is not supported. Please test it with systrace before adding "
"it to the list.");
TracedOrdinal(const std::string& name, T initialValue)
: mName(name),
mNameNegative(android::base::StringPrintf("%sNegative", name.c_str())),
mHasGoneNegative(std::signbit(initialValue)),
mData(initialValue) {
trace();
}
operator T() const { return mData; }
TracedOrdinal& operator=(T other) {
mData = other;
mHasGoneNegative = mHasGoneNegative || std::signbit(mData);
trace();
return *this;
}
private:
void trace() {
if (!std::signbit(mData)) {
ATRACE_INT64(mName.c_str(), int64_t(mData));
if (mHasGoneNegative) {
ATRACE_INT64(mNameNegative.c_str(), 0);
}
} else {
ATRACE_INT64(mNameNegative.c_str(), -int64_t(mData));
ATRACE_INT64(mName.c_str(), 0);
}
}
const std::string mName;
const std::string mNameNegative;
bool mHasGoneNegative;
T mData;
};
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