services/surfaceflinger/TraceUtils.h

/*
 * Copyright 2021 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.
 */

// TODO(b/183120308): This file is a copy of f/b/libs/hwui/utils/TraceUtils.h
//  It should be migrated to a common place where both SF and hwui could use it.

#pragma once

#include <cutils/trace.h>
#include <utils/Trace.h>

#define ATRACE_FORMAT(fmt, ...)           \
    TraceUtils::TraceEnder __traceEnder = \
            (TraceUtils::atraceFormatBegin(fmt, ##__VA_ARGS__), TraceUtils::TraceEnder())

#define ATRACE_FORMAT_BEGIN(fmt, ...) TraceUtils::atraceFormatBegin(fmt, ##__VA_ARGS__)

namespace android {

class TraceUtils {
public:
    class TraceEnder {
    public:
        ~TraceEnder() { ATRACE_END(); }
    };

    static void atraceFormatBegin(const char* fmt, ...) {
        if (CC_LIKELY(!ATRACE_ENABLED())) return;

        const int BUFFER_SIZE = 256;
        va_list ap;
        char buf[BUFFER_SIZE];

        va_start(ap, fmt);
        vsnprintf(buf, BUFFER_SIZE, fmt, ap);
        va_end(ap);

        ATRACE_BEGIN(buf);
    }

}; // class TraceUtils

} /* namespace android */