Android content shell bringup.

content/browser/android/trace_event_binding.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/android/trace_event_binding.h"
+
+#include <jni.h>
+
+#include <set>
+
+#include "base/debug/trace_event.h"
+#include "base/lazy_instance.h"
+#include "jni/trace_event_jni.h"
+
+namespace {
+
+const char kJavaCategory[] = "Java";
+
+// Boilerplate for safely converting Java data to TRACE_EVENT data.
+class TraceEventDataConverter {
+ public:
+  TraceEventDataConverter(JNIEnv* env,
+                          jstring jname,
+                          jstring jarg)
+      : env_(env),
+      jname_(jname),
+      jarg_(jarg),
+      name_(env->GetStringUTFChars(jname, NULL)),
+      arg_(jarg ? env->GetStringUTFChars(jarg, NULL) : NULL) {
+  }
+  ~TraceEventDataConverter() {
+    env_->ReleaseStringUTFChars(jname_, name_);
+    if (jarg_)
+      env_->ReleaseStringUTFChars(jarg_, arg_);
+  }
+
+  // Return saves values to pass to TRACE_EVENT macros.
+  const char* name() { return name_; }
+  const char* arg_name() { return arg_ ? "arg" : NULL; }
+  const char* arg() { return arg_; }
+
+ private:
+  JNIEnv* env_;
+  jstring jname_;
+  jstring jarg_;
+  const char* name_;
+  const char* arg_;
+
+  DISALLOW_COPY_AND_ASSIGN(TraceEventDataConverter);
+};
+
+}  // namespace
+
+static jboolean TraceEnabled(JNIEnv* env, jclass clazz) {
+  return base::debug::TraceLog::GetInstance()->IsEnabled();
+}
+
+static void Instant(JNIEnv* env, jclass clazz,
+                    jstring jname, jstring jarg) {
+  TraceEventDataConverter converter(env, jname, jarg);
+  if (converter.arg()) {
+    TRACE_EVENT_COPY_INSTANT1(kJavaCategory, converter.name(),
+                              converter.arg_name(), converter.arg());
+  } else {
+    TRACE_EVENT_COPY_INSTANT0(kJavaCategory, converter.name());
+  }
+}
+
+static void Begin(JNIEnv* env, jclass clazz,
+                  jstring jname, jstring jarg) {
+  TraceEventDataConverter converter(env, jname, jarg);
+  if (converter.arg()) {
+    TRACE_EVENT_COPY_BEGIN1(kJavaCategory, converter.name(),
+                       converter.arg_name(), converter.arg());
+  } else {
+    TRACE_EVENT_COPY_BEGIN0(kJavaCategory, converter.name());
+  }
+}
+
+static void End(JNIEnv* env, jclass clazz,
+                jstring jname, jstring jarg) {
+  TraceEventDataConverter converter(env, jname, jarg);
+  if (converter.arg()) {
+    TRACE_EVENT_COPY_END1(kJavaCategory, converter.name(),
+                     converter.arg_name(), converter.arg());
+  } else {
+    TRACE_EVENT_COPY_END0(kJavaCategory, converter.name());
+  }
+}
+
+bool RegisterTraceEvent(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}