108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <chrono>
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#include <cmath>
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#include <functional>
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#include <string>
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#include <cutils/compiler.h>
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#include <utils/Trace.h>
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namespace android {
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namespace {
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template <class Rep, class Period>
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bool signbit(std::chrono::duration<Rep, Period> v) {
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return std::signbit(std::chrono::duration_cast<std::chrono::nanoseconds>(v).count());
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}
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template <typename Enum, typename std::enable_if<std::is_enum<Enum>::value>::type* = nullptr>
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bool signbit(Enum e) {
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return std::signbit(static_cast<typename std::underlying_type<Enum>::type>(e));
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}
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template <typename T, typename std::enable_if<!std::is_enum<T>::value>::type* = nullptr>
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bool signbit(T t) {
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return std::signbit(t);
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}
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template <typename T>
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int64_t to_int64(T v) {
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return int64_t(v);
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}
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template <class Rep, class Period>
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int64_t to_int64(std::chrono::duration<Rep, Period> v) {
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return int64_t(v.count());
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}
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} // namespace
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template <typename T>
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class TracedOrdinal {
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public:
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static_assert(std::is_same<bool, T>() || (std::is_signed<T>() && std::is_integral<T>()) ||
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std::is_same<std::chrono::nanoseconds, T>() || std::is_enum<T>(),
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"Type is not supported. Please test it with systrace before adding "
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"it to the list.");
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TracedOrdinal(std::string name, T initialValue)
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: mName(std::move(name)), mHasGoneNegative(signbit(initialValue)), mData(initialValue) {
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trace();
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}
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T get() const { return mData; }
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operator T() const { return get(); }
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TracedOrdinal& operator=(T other) {
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mData = other;
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mHasGoneNegative = mHasGoneNegative || signbit(mData);
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trace();
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return *this;
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}
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private:
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void trace() {
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if (CC_LIKELY(!ATRACE_ENABLED())) {
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return;
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}
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if (mNameNegative.empty()) {
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mNameNegative = mName + "Negative";
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}
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if (!signbit(mData)) {
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ATRACE_INT64(mName.c_str(), to_int64(mData));
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if (mHasGoneNegative) {
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ATRACE_INT64(mNameNegative.c_str(), 0);
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}
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} else {
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ATRACE_INT64(mNameNegative.c_str(), -to_int64(mData));
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ATRACE_INT64(mName.c_str(), 0);
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}
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}
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const std::string mName;
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std::string mNameNegative;
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bool mHasGoneNegative;
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T mData;
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};
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} // namespace android
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