library_loader_hooks.cc revision 010d83a9304c5a91596085d917d248abff47903a 
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
12namespace base {
13namespace android {
14
15namespace {
16
17base::AtExitManager* g_at_exit_manager = NULL;
18const char* g_library_version_number = "";
19LibraryLoadedHook* g_registration_callback = NULL;
20
21} // namespace
22
23void SetLibraryLoadedHook(LibraryLoadedHook* func) {
24  g_registration_callback = func;
25}
26
27static 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
35static 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
46void LibraryLoaderExitHook() {
47  if (g_at_exit_manager) {
48    delete g_at_exit_manager;
49    g_at_exit_manager = NULL;
50  }
51}
52
53bool 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
60void SetVersionNumber(const char* version_number) {
61  g_library_version_number = strdup(version_number);
62}
63
64jstring GetVersionNumber(JNIEnv* env, jclass clazz) {
65  return ConvertUTF8ToJavaString(env, g_library_version_number).Release();
66}
67
68static void RecordNativeLibraryHack(JNIEnv*, jclass, jboolean usedHack) {
69  UMA_HISTOGRAM_BOOLEAN("LibraryLoader.NativeLibraryHack", usedHack);
70}
71
72}  // namespace android
73}  // namespace base
74