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