src/base/android/library_loader/library_loader_hooks.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/library_loader/library_loader_hooks.h"
   6
   7 #include "base/android/jni_string.h"
   8 #include "base/at_exit.h"
   9 #include "base/metrics/histogram.h"
  10 #include "jni/LibraryLoader_jni.h"
  11
  12 namespace base {
  13 namespace android {
  14
  15 namespace {
  16
  17 base::AtExitManager* g_at_exit_manager = NULL;
  18 const char* g_library_version_number = "";
  19 LibraryLoadedHook* g_registration_callback = NULL;
  20
  21 } // namespace
  22
  23 void SetLibraryLoadedHook(LibraryLoadedHook* func) {
  24   g_registration_callback = func;
  25 }
  26
  27 static jboolean LibraryLoaded(JNIEnv* env, jclass clazz,
  28                           jobjectArray init_command_line) {
  29   if(g_registration_callback == NULL) {
  30     return true;
  31   }
  32   return g_registration_callback(env, clazz, init_command_line);
  33 }
  34
  35 static void RecordChromiumAndroidLinkerHistogram(
  36     JNIEnv* env,
  37     jclass clazz,
  38     jboolean loaded_at_fixed_address_failed,
  39     jboolean is_low_memory_device) {
  40   UMA_HISTOGRAM_BOOLEAN("ChromiumAndroidLinker.LoadedAtFixedAddressFailed",
  41                         loaded_at_fixed_address_failed);
  42   UMA_HISTOGRAM_BOOLEAN("ChromiumAndroidLinker.IsLowMemoryDevice",
  43                         is_low_memory_device);
  44 }
  45
  46 void LibraryLoaderExitHook() {
  47   if (g_at_exit_manager) {
  48     delete g_at_exit_manager;
  49     g_at_exit_manager = NULL;
  50   }
  51 }
  52
  53 bool RegisterLibraryLoaderEntryHook(JNIEnv* env) {
  54   // We need the AtExitManager to be created at the very beginning.
  55   g_at_exit_manager = new base::AtExitManager();
  56
  57   return RegisterNativesImpl(env);
  58 }
  59
  60 void SetVersionNumber(const char* version_number) {
  61   g_library_version_number = strdup(version_number);
  62 }
  63
  64 jstring GetVersionNumber(JNIEnv* env, jclass clazz) {
  65   return ConvertUTF8ToJavaString(env, g_library_version_number).Release();
  66 }
  67
  68 static void RecordNativeLibraryHack(JNIEnv*, jclass, jboolean usedHack) {
  69   UMA_HISTOGRAM_BOOLEAN("LibraryLoader.NativeLibraryHack", usedHack);
  70 }
  71
  72 }  // namespace android
  73 }  // namespace base