library_loader_hooks.cc revision effb81e5f8246d0db0270817048dc992db66e9fb 
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
11namespace base {
12namespace android {
13
14namespace {
15
16base::AtExitManager* g_at_exit_manager = NULL;
17const char* g_library_version_number = "";
18LibraryLoadedHook* g_registration_callback = NULL;
19
20} // namespace
21
22void SetLibraryLoadedHook(LibraryLoadedHook* func) {
23  g_registration_callback = func;
24}
25
26static 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
34static 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
45void LibraryLoaderExitHook() {
46  if (g_at_exit_manager) {
47    delete g_at_exit_manager;
48    g_at_exit_manager = NULL;
49  }
50}
51
52bool 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
59void SetVersionNumber(const char* version_number) {
60  g_library_version_number = strdup(version_number);
61}
62
63jstring GetVersionNumber(JNIEnv* env, jclass clazz) {
64  return env->NewStringUTF(g_library_version_number);
65}
66
67static void RecordNativeLibraryHack(JNIEnv*, jclass, jboolean usedHack) {
68  UMA_HISTOGRAM_BOOLEAN("LibraryLoader.NativeLibraryHack", usedHack);
69}
70
71}  // namespace android
72}  // namespace base
73