base/android/trace_event_binding.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/android/trace_event_binding.h"
   6
   7 #include <jni.h>
   8
   9 #include <set>
  10
  11 #include "base/android/jni_string.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/trace_event/trace_event.h"
  14 #include "base/trace_event/trace_event_impl.h"
  15 #include "jni/TraceEvent_jni.h"
  16
  17 namespace base {
  18 namespace android {
  19
  20 namespace {
  21
  22 const char kJavaCategory[] = "Java";
  23 const char kToplevelCategory[] = "toplevel";
  24 const char kLooperDispatchMessage[] = "Looper.dispatchMessage";
  25
  26 // Boilerplate for safely converting Java data to TRACE_EVENT data.
  27 class TraceEventDataConverter {
  28  public:
  29   TraceEventDataConverter(JNIEnv* env, jstring jname, jstring jarg)
  30       : env_(env),
  31         jname_(jname),
  32         jarg_(jarg),
  33         name_(ConvertJavaStringToUTF8(env, jname)),
  34         has_arg_(jarg != nullptr),
  35         arg_(jarg ? ConvertJavaStringToUTF8(env, jarg) : "") {}
  36   ~TraceEventDataConverter() {
  37   }
  38
  39   // Return saves values to pass to TRACE_EVENT macros.
  40   const char* name() { return name_.c_str(); }
  41   const char* arg_name() { return has_arg_ ? "arg" : nullptr; }
  42   const char* arg() { return has_arg_ ? arg_.c_str() : nullptr; }
  43
  44  private:
  45   JNIEnv* env_;
  46   jstring jname_;
  47   jstring jarg_;
  48   std::string name_;
  49   bool has_arg_;
  50   std::string arg_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(TraceEventDataConverter);
  53 };
  54
  55 class TraceEnabledObserver
  56     : public trace_event::TraceLog::EnabledStateObserver {
  57   public:
  58    void OnTraceLogEnabled() override {
  59       JNIEnv* env = base::android::AttachCurrentThread();
  60       base::android::Java_TraceEvent_setEnabled(env, true);
  61     }
  62     void OnTraceLogDisabled() override {
  63       JNIEnv* env = base::android::AttachCurrentThread();
  64       base::android::Java_TraceEvent_setEnabled(env, false);
  65     }
  66 };
  67
  68 base::LazyInstance<TraceEnabledObserver>::Leaky g_trace_enabled_state_observer_;
  69
  70 }  // namespace
  71
  72 static void RegisterEnabledObserver(JNIEnv* env, jclass clazz) {
  73   bool enabled = trace_event::TraceLog::GetInstance()->IsEnabled();
  74   base::android::Java_TraceEvent_setEnabled(env, enabled);
  75   trace_event::TraceLog::GetInstance()->AddEnabledStateObserver(
  76       g_trace_enabled_state_observer_.Pointer());
  77 }
  78
  79 static void StartATrace(JNIEnv* env, jclass clazz) {
  80   base::trace_event::TraceLog::GetInstance()->StartATrace();
  81 }
  82
  83 static void StopATrace(JNIEnv* env, jclass clazz) {
  84   base::trace_event::TraceLog::GetInstance()->StopATrace();
  85 }
  86
  87 static void Instant(JNIEnv* env, jclass clazz,
  88                     jstring jname, jstring jarg) {
  89   TraceEventDataConverter converter(env, jname, jarg);
  90   if (converter.arg()) {
  91     TRACE_EVENT_COPY_INSTANT1(kJavaCategory, converter.name(),
  92                               TRACE_EVENT_SCOPE_THREAD,
  93                               converter.arg_name(), converter.arg());
  94   } else {
  95     TRACE_EVENT_COPY_INSTANT0(kJavaCategory, converter.name(),
  96                               TRACE_EVENT_SCOPE_THREAD);
  97   }
  98 }
  99
 100 static void Begin(JNIEnv* env, jclass clazz,
 101                   jstring jname, jstring jarg) {
 102   TraceEventDataConverter converter(env, jname, jarg);
 103   if (converter.arg()) {
 104     TRACE_EVENT_COPY_BEGIN1(kJavaCategory, converter.name(),
 105                        converter.arg_name(), converter.arg());
 106   } else {
 107     TRACE_EVENT_COPY_BEGIN0(kJavaCategory, converter.name());
 108   }
 109 }
 110
 111 static void End(JNIEnv* env, jclass clazz,
 112                 jstring jname, jstring jarg) {
 113   TraceEventDataConverter converter(env, jname, jarg);
 114   if (converter.arg()) {
 115     TRACE_EVENT_COPY_END1(kJavaCategory, converter.name(),
 116                      converter.arg_name(), converter.arg());
 117   } else {
 118     TRACE_EVENT_COPY_END0(kJavaCategory, converter.name());
 119   }
 120 }
 121
 122 static void BeginToplevel(JNIEnv* env, jclass clazz) {
 123   TRACE_EVENT_BEGIN0(kToplevelCategory, kLooperDispatchMessage);
 124 }
 125
 126 static void EndToplevel(JNIEnv* env, jclass clazz) {
 127   TRACE_EVENT_END0(kToplevelCategory, kLooperDispatchMessage);
 128 }
 129
 130 static void StartAsync(JNIEnv* env, jclass clazz, jstring jname, jlong jid) {
 131   TraceEventDataConverter converter(env, jname, nullptr);
 132   TRACE_EVENT_COPY_ASYNC_BEGIN0(kJavaCategory, converter.name(), jid);
 133 }
 134
 135 static void FinishAsync(JNIEnv* env, jclass clazz, jstring jname, jlong jid) {
 136   TraceEventDataConverter converter(env, jname, nullptr);
 137   TRACE_EVENT_COPY_ASYNC_END0(kJavaCategory, converter.name(), jid);
 138 }
 139
 140 bool RegisterTraceEvent(JNIEnv* env) {
 141   return RegisterNativesImpl(env);
 142 }
 143
 144 }  // namespace android
 145 }  // namespace base