Home | History | Annotate | Download | only in base 
      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 #include <sstream>
     21 #include <string>
     22 
     23 #include "android-base/stringprintf.h"
     24 #include "macros.h"
     25 #include "palette/palette.h"
     26 
     27 namespace art {
     28 
     29 inline bool ATraceEnabled() {
     30   int enabled = 0;
     31   if (UNLIKELY(PaletteTraceEnabled(&enabled) == PaletteStatus::kOkay && enabled != 0)) {
     32     return true;
     33   } else {
     34     return false;
     35   }
     36 }
     37 
     38 inline void ATraceBegin(const char* name) {
     39   PaletteTraceBegin(name);
     40 }
     41 
     42 inline void ATraceEnd() {
     43   PaletteTraceEnd();
     44 }
     45 
     46 inline void ATraceIntegerValue(const char* name, int32_t value) {
     47   PaletteTraceIntegerValue(name, value);
     48 }
     49 
     50 class ScopedTrace {
     51  public:
     52   explicit ScopedTrace(const char* name) {
     53     ATraceBegin(name);
     54   }
     55   template <typename Fn>
     56   explicit ScopedTrace(Fn fn) {
     57     if (UNLIKELY(ATraceEnabled())) {
     58       ATraceBegin(fn().c_str());
     59     }
     60   }
     61 
     62   explicit ScopedTrace(const std::string& name) : ScopedTrace(name.c_str()) {}
     63 
     64   ~ScopedTrace() {
     65     ATraceEnd();
     66   }
     67 };
     68 
     69 // Helper for the SCOPED_TRACE macro. Do not use directly.
     70 class ScopedTraceNoStart {
     71  public:
     72   ScopedTraceNoStart() {
     73   }
     74 
     75   ~ScopedTraceNoStart() {
     76     ATraceEnd();
     77   }
     78 
     79   // Message helper for the macro. Do not use directly.
     80   class ScopedTraceMessageHelper {
     81    public:
     82     ScopedTraceMessageHelper() {
     83     }
     84     ~ScopedTraceMessageHelper() {
     85       ATraceBegin(buffer_.str().c_str());
     86     }
     87 
     88     std::ostream& stream() {
     89       return buffer_;
     90     }
     91 
     92    private:
     93     std::ostringstream buffer_;
     94   };
     95 };
     96 
     97 #define SCOPED_TRACE \
     98   ::art::ScopedTraceNoStart APPEND_TOKENS_AFTER_EVAL(trace, __LINE__) ; \
     99   (ATraceEnabled()) && ::art::ScopedTraceNoStart::ScopedTraceMessageHelper().stream()
    100 
    101 }  // namespace art
    102 
    103 #endif  // ART_LIBARTBASE_BASE_SYSTRACE_H_
    104