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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_LIBARTBASE_BASE_SYSTRACE_H_
     18 #define ART_LIBARTBASE_BASE_SYSTRACE_H_
     19 
     20 #define ATRACE_TAG ATRACE_TAG_DALVIK
     21 #include <cutils/trace.h>
     22 
     23 #include <sstream>
     24 #include <string>
     25 
     26 #include "android-base/stringprintf.h"
     27 
     28 namespace art {
     29 
     30 class ScopedTrace {
     31  public:
     32   explicit ScopedTrace(const char* name) {
     33     ATRACE_BEGIN(name);
     34   }
     35   template <typename Fn>
     36   explicit ScopedTrace(Fn fn) {
     37     if (ATRACE_ENABLED()) {
     38       ATRACE_BEGIN(fn().c_str());
     39     }
     40   }
     41 
     42   explicit ScopedTrace(const std::string& name) : ScopedTrace(name.c_str()) {}
     43 
     44   ~ScopedTrace() {
     45     ATRACE_END();
     46   }
     47 };
     48 
     49 // Helper for the SCOPED_TRACE macro. Do not use directly.
     50 class ScopedTraceNoStart {
     51  public:
     52   ScopedTraceNoStart() {
     53   }
     54 
     55   ~ScopedTraceNoStart() {
     56     ATRACE_END();
     57   }
     58 
     59   // Message helper for the macro. Do not use directly.
     60   class ScopedTraceMessageHelper {
     61    public:
     62     ScopedTraceMessageHelper() {
     63     }
     64     ~ScopedTraceMessageHelper() {
     65       ATRACE_BEGIN(buffer_.str().c_str());
     66     }
     67 
     68     std::ostream& stream() {
     69       return buffer_;
     70     }
     71 
     72    private:
     73     std::ostringstream buffer_;
     74   };
     75 };
     76 
     77 #define SCOPED_TRACE \
     78   ::art::ScopedTraceNoStart trace ## __LINE__; \
     79   (ATRACE_ENABLED()) && ::art::ScopedTraceNoStart::ScopedTraceMessageHelper().stream()
     80 
     81 }  // namespace art
     82 
     83 #endif  // ART_LIBARTBASE_BASE_SYSTRACE_H_
     84